JP7779015B2 - Zippered paper container - Google Patents

Description

This disclosure relates to paper containers with zippers, particularly in the field of paper containers with a three-dimensional shape and self-standing properties, and relates to a paper container with zippers that makes it easy to open the opening of the container when the male and female mating portions of the zipper tape are disengaged and the zipper tape is opened.

Patent Document 1 discloses a conventional paper container with a zipper. Specifically, a zipper is provided on the top of a rectangular parallelepiped paper container, and the zipper can be opened to remove the contents, and then closed once the contents have been removed.

The above technology protects the contents and prevents them from spilling if the paper container is tipped over. Furthermore, because it is a paper container, it is easy to reduce the container's volume and dispose of it after the contents have been consumed. Figure 1 shows a blank plate 81 used to manufacture a conventional paper container 80 with a zipper, Figure 2 shows a perspective view of the conventional paper container 80 with a zipper, and Figure 3 shows a perspective view of the container with the top open.

Unless otherwise specified, the following will refer to Figure 2, with the front wall panel 831b as the front, and indicate the front, back, left, right, top, and bottom of the resealable paper container 80. The same applies to the resealable paper container 90 of the present disclosure.

Furthermore, the reference numerals used when describing the prior art are in the 80s or 800s to distinguish them from the present disclosure.
The subscript a of the symbol indicates an element on the back side of the resealable paper container 80, and the subscript b indicates an element on the front side. For elements with both the subscripts a and b, the symbol without a subscript includes both a and b.

In the resealable paper container 80 described in Patent Document 1, when the top 871 is opened and the contents are removed, the protruding portion (ear) 874 on the top surface is first removed from the body 872, the easy-open processing line 851 is then cut, and the male and female mating portions of the zipper tape 861 are released to open the removal opening 856 (see Figure 3).
The contents are then removed through the removal opening 856.

When opening the zipper tape 861, the front opening grip 857b above the front zipper tape 861b and the back opening grip 857b above the back zipper tape 861a are grasped with the fingers of the hand, respectively, to open the resealable paper container in the front-to-back direction. In this process, the front opening grip 857b and the back opening grip 857a sometimes overlap, eliminating the gap (see Figure 15A). This makes it difficult to insert the fingers, making it difficult to release the zipper tape 861, and making it difficult to open the resealable paper container.

Japanese Patent Application Laid-Open No. 2005-178833

The present disclosure has been made to solve the above-mentioned problems, and its objective is to provide a resealable paper container 90 in which the removal opening of the resealable paper container is easy to open when the male and female mating portions of the resealable paper container's zipper tape are disengaged and the zipper tape is opened.

The above problems can be solved by the following embodiments of the present disclosure.
That is, the resealable paper container 90 of the present disclosure has:
In a paper container 90 with a zipper, a blank plate 10 made of a laminated sheet 78 including a paper base layer 782 is assembled.
The blank plate 10 includes at least a front blank plate 10b and a back blank plate 10a,
A top portion 71 is provided at the top of the zipper-equipped paper container 90, and includes an upper overlapping plate 34 formed by overlapping and joining the front blank plate 10b and the back blank plate 10a, and a top plate 33 connected to the lower side of the upper overlapping plate 34;
Side plates 41 of the top portion connected to both the left and right sides of the upper overlapping plate 34;
A top-side protrusion 74 is provided on both the left and right sides of the top portion 71;
A body portion 72 provided below the top portion 71;
a bottom portion 73 provided on the lower side of the body portion 72;
an upper seal portion 53 that crosses the upper edge portion 21 or the vicinity of the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of the top portion;
a zipper tape (61) located below the upper seal portion (53) and extending across the upper overlapping plate (34) and the side plate (41) of the top portion;
At least one of the front blank plate 10b or the back blank plate 10a has an opening hook 55 on the upper edge 21 side of the zipper tape 61.

In addition, in the resealable paper container 90 of the present disclosure,
An opening tab 55 may be provided on the upper edge 21 side of the zipper tape 61 of both the front blank plate 10b and the back blank plate 10a.

In addition, in the resealable paper container 90 of the present disclosure,
The opening notch 55 may be a ruled line.

In addition, in the resealable paper container 90 of the present disclosure,
The lines of the opening catch 55 may include lines that are concave when viewed from the outside of the resealable paper container 90.

In addition, in the resealable paper container 90 of the present disclosure,
The lines of the opening catch 55 may include lines that are convex when viewed from the outside of the resealable paper container 90.

In addition, in the resealable paper container 90 of the present disclosure,
The opening tab 55 may include a horizontal line extending in the horizontal direction of the resealable paper container 90 .

In addition, in the resealable paper container 90 of the present disclosure,
The opening tab 55 may include two or more horizontal lines.

In addition, in the resealable paper container 90 of the present disclosure,
The opening tab 55 may include a vertical line extending in the vertical direction of the resealable paper container 90 .

In addition, in the resealable paper container 90 of the present disclosure,
The opening tab 55 includes two or more vertical lines extending in the vertical direction of the resealable paper container 90,
The vertical lines may be positioned in the lateral direction of the resealable paper container 90 relative to one another.

In addition, in the resealable paper container 90 of the present disclosure,
The opening hook 55 may include a concave embossed portion that is concave toward the outer side of the resealable paper container 90 .

In addition, in the resealable paper container 90 of the present disclosure,
The opening hook 55 may include a convex embossed portion that is convex toward the outer side of the resealable paper container 90 .

According to the above-described embodiment of the present disclosure, the following resealable paper container can be provided.
That is, the blank plate 10 of the resealable paper container 90 of the present disclosure is provided with an opening tab 55 on the upper side of the zipper tape 61. When a user opens the top part 71 of the resealable paper container 90 containing the contents, the user first cuts the easy-open processing line 51 on the top part 71 to expose the zipper tape 61.

Then, the action of the opening catch 55 causes the end face of the front easy-open processing line 51b and/or the end face of the back easy-open processing line 51a to deform so that they open outward. This creates an opening catch gap 58 between the front opening grip 57b above the front zipper tape 61b and the back opening grip 57a above the back zipper tape 61a. This makes it easier to insert your fingers, making it easier to grasp the front opening grip 57b and back opening grip 57a with your fingers.

When the front and back opening grips 57b and 57a are grasped with the fingers of the hand and the resealable paper container is opened in the front-to-back direction, the zipper tape 61 is released. This provides a resealable paper container 90 that is easy to open when the user releases the zipper tape 61 of the resealable paper container 90 to remove the contents.

1 is a development view of a blank plate 81 used in manufacturing a paper container 80 with a zipper according to the prior art. FIG. 1 is a perspective view of a resealable paper container 80 according to the prior art. 3 is a perspective view of the resealable paper container 80 shown in FIG. 2 with the top portion 871 open. FIG. 1 is a development view of a front blank plate 10b used in manufacturing a resealable paper container 90 according to one embodiment of the present disclosure. FIG. 1 is a development view of a back blank plate 10a used to manufacture a resealable paper container 90 according to one embodiment of the present disclosure. FIG. 4A and 4B are used to produce a paper container with a zipper 90. FIG. 4A and 4B are used to produce a paper container with a zipper 90. FIG. FIG. 4C is a perspective view of a resealable paper container 90 produced using the blank plate 10 shown in FIGS. 4A and 4B. FIG. 8 is a side view of the resealable paper container 90 shown in FIG. 7. FIG. 8 is a plan view of the resealable paper container 90 shown in FIG. 7. FIG. 10 is a perspective view of a resealable paper container 93 with the top seal portion cut off. 11 is a perspective view of the resealable paper container 93 shown in FIG. 10 with the top seal portion cut off and the top portion 71 open. FIG. 1 is a cross-sectional view of a laminated sheet 78 of one embodiment of the blank plate 10. FIG. 10 is a cross-sectional view of a laminated sheet 78 of another embodiment of the blank plate 10. FIG. 10 is a cross-sectional view of a laminated sheet 78 of yet another embodiment of the blank plate 10. FIG. 10 is a cross-sectional view of a laminated sheet 78 of yet another embodiment of the blank plate 10. FIG. 5 is a partially enlarged view of a paper container (flat state) of a resealable paper container 90 in an intermediate stage of the first aspect of the first embodiment (enlarged view of part A in FIG. 5). 5 is a partially enlarged view of a resealable paper container 90 in an intermediate stage (flat state) according to a second aspect of the first embodiment (enlarged view of part A in FIG. 5). 5 is a partially enlarged view of a resealable paper container 90 in an intermediate stage (flat state) according to a third aspect of the first embodiment (enlarged view of part A in FIG. 5). 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of the resealable paper container 90 of the first aspect of the second embodiment and the first aspect of the fourth embodiment (enlarged view of part A in FIG. 5). 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of the resealable paper container 90 of the second aspect of the second embodiment and the second aspect of the fourth embodiment (enlarged view of part A in FIG. 5). 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of the resealable paper container 90 of the first aspect of the third embodiment and the first aspect of the fifth embodiment (enlarged view of part A in FIG. 5). 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of the resealable paper container 90 according to the second aspect of the third embodiment and the second aspect of the fifth embodiment (enlarged view of part A in FIG. 5). 10 is an end view of the top edge of a resealable paper container 80 of the prior art, with the top seal portion cut off (the same position as arrow B in FIG. 10 ). 11 is a cross-sectional view of the upper overlapping plate 34 at the cross-sectional position DD shown in FIG. 10 in the resealable paper container 90 of the first aspect of the first embodiment. FIG. 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut off in the resealable paper container 90 of the first aspect of the first embodiment and the second aspect of the first embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the third aspect of the first embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the first aspect of the second embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the second aspect of the second embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the first aspect of the third embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the second aspect of the third embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the first aspect of the fourth embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the second aspect of the fourth embodiment (see arrow B in FIG. 10 ). 10 is an end view of the upper edge portion 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the first aspect of the fifth embodiment (see arrow B in FIG. 10 ). 10 is a cross-sectional view of the upper edge 21 of the resealable paper container 93 with the upper seal portion cut away in the resealable paper container 90 of the second aspect of the fifth embodiment (see arrow B in FIG. 10 ). 5 is an enlarged cross-sectional view of one embodiment of a joining portion between the blank plate 10 and the zipper tape 61 (see cross-sectional position CC in FIG. 5). 5 is an enlarged cross-sectional view of another embodiment of the joining portion between the blank plate 10 and the zipper tape 61 (see cross-sectional position CC in FIG. 5).

The present disclosure will be described below with reference to the drawings, but the present disclosure is not limited to the specifically illustrated embodiments or various specifically described structures.
In each drawing, the size and proportions of the components may be changed or exaggerated for ease of understanding. Also, for clarity, unnecessary parts and repeated reference numerals may be omitted.

Furthermore, the numerical values such as dimensions of each component and the names of materials described in this specification are examples of embodiments and are not limited to these, and may be selected and used as appropriate. In this specification, terms specifying shapes or geometric conditions, such as parallel, orthogonal, and perpendicular, are intended to include not only their strict meanings but also substantially the same state.

The blank plate 10 of the resealable paper container 90 of the present disclosure is formed into a rectangular outer shape using a laminate sheet 78, in which a paper base layer 782 is laminated, a paper base protective layer 788 is laminated to one of the outer layers of the paper base layer 782, and a thermoplastic resin such as polyethylene is laminated as at least the innermost layer. Various folding lines are provided within the blank plate 10 to separate the forming plates for each part required to form the resealable paper container 90.

<First aspect of the first embodiment>
<Blank board>
The blank plates 10 of the resealable paper container 90 of this embodiment are shown in Figures 4A and 4B. Figure 4A shows the back blank plate 10a, and Figure 4B shows the front blank plate 10b. The back blank plate 10a and the front blank plate 10b are collectively referred to as the blank plate 10.

Unless otherwise specified, for each component of the blank plate 10 described below, the subscript "a" of each symbol indicates an element on the back blank plate 10a, and the subscript "b" indicates an element on the front blank plate 10b. For elements with both the subscripts "a" and "b," the symbol without a subscript is considered to include both "a" and "b."

The upper edge 21a of the back side, which is the lower side of the back side blank plate 10a in the drawing of FIG. 4A, becomes the upper side of the resealable paper container 90.
The upper edge 21b of the front side of the front blank plate 10b in FIG. 4B, which is the upper side in the drawing, becomes the upper side of the resealable paper container 90.

In both Figures 4A and 4B, the front side of the drawing corresponds to the outer surface when the resealable paper container 90 is assembled, and the back side corresponds to the inner surface.
Figures 4A and 4B are linearly symmetrical with respect to the respective upper edges 21a and 21b, except for some components (such as the opening notch 55) described below. When the inner surfaces of the back blank plate 10a and the front blank plate 10b are aligned and overlapped, the components (such as the forming plates, lines, seal portions, and zipper tape joints described below) overlap.

The back blank plate 10a and the front blank plate 10b are aligned and stacked and joined to produce an intermediate stage paper container with a zipper (flat state) 91 as shown in Figure 5, and then an intermediate stage paper container with a zipper (boxed state) 92 as shown in Figure 6 is produced, and the process continues towards the completion of the paper container with a zipper 90; this manufacturing method will be described later.

Unless otherwise specified, the top, bottom, left, and right of the front blank plate 10b will be shown with reference to Figure 4B. The back blank plate 10a will also be described with its upper edge 21a as the top side. Therefore, the top and bottom are reversed in Figure 4A.
In the resealable paper container 90, the upper edge 21 side is the upper side, and the lower edge 26 side is the lower side.

As will be explained later, the formed resealable paper container 90 is composed of, in order from the top, a top portion 71, a body portion 72, and a bottom portion 73, and the top portion may be referred to as the top portion, and the bottom portion may be referred to as the bottom portion (see FIG. 7).
Furthermore, when describing the up-down direction of each component provided on the top portion 71, the term "top side" may refer to the upper edge portion 21 side, and when describing the up-down direction of each component provided on the bottom portion 73, the term "bottom side" may refer to the lower edge portion 26 side.

As described above, the rear blank plate 10a and the front blank plate 10b are substantially symmetrical in shape vertically, so the blank plate 10 will be described with reference to the front blank plate 10b.
The rear blank plate 10a and the front blank plate 10b are also made of the same material (layer structure) and are manufactured by the same method.

The front blank plate 10b of the resealable paper container 90 of this embodiment has a substantially rectangular outer shape and is formed using a laminated sheet 78 having at least a base paper layer and at least an innermost layer of a thermoplastic resin such as polyethylene. Referring to Figure 4B, the top side is the front upper edge 21b, the left and right sides are the front side edge portions 11b, and the bottom side is the front lower edge portion 26b.
The front blank plate 10b has a shape that is symmetrical with respect to a vertical line passing through the center of the front blank plate 10b in the width direction.
The laminated sheet 78 will be described later.

The front blank plate 10b has, in the transverse direction from the front upper edge 21b, a front first horizontal fold line 22b, a front second horizontal fold line 23b, a front third horizontal fold line 24b, and a front fourth horizontal fold line 25b.
These front side horizontal folding lines 22b, 23b, 24b, 25b are preferably parallel to the front side upper edge 21b and the front side lower edge 26b, respectively.

The front blank plate 10b is provided with a front first vertical bending line 12b, a front second vertical bending line 13b, a front second vertical bending line 13b and a front first vertical bending line 12b running vertically from the left side in this order.
That is, the vertical folding line closer to the side edge 11b of each front blank plate 10b is the front first vertical folding line 12b, and the vertical folding line farther from the side edge 11b of each front blank plate 10b is the front second vertical folding line 13b.
It is desirable that the front longitudinal folding lines 12b, 13b are each substantially parallel to the side edge 11b of the front blank plate 10b.

Furthermore, a pair of diagonal fold lines 17b on the top of the front side and a pair of diagonal fold lines 18b on the bottom of the front side are provided on the left and right sides, and the forming plates for each part required to form the resealable paper container 90 are configured to be separated.

The oblique folding line 17b on the top of the front side starts from the intersection Fb of the second top of the front side, which is the intersection of the second vertical folding line 13b on the front side and the second horizontal folding line 23b on the front side.
Furthermore, the diagonal fold line 17b on the front side connects the second top intersection Fb on the front side with the first top intersection Eb on the front side, which is the intersection of the first vertical fold line 12b and the first horizontal fold line 22b, and extends to the side edge 11b on the front side. The intersection of the side edge 11b and the diagonal fold line 17b on the front side is the end point of the diagonal fold line 17b on the front side.

The front bottom diagonal fold line 18b starts from the front second bottom intersection point Hb, which is the intersection point of the front second vertical fold line 13b and the front third horizontal fold line 24b.
Furthermore, the front bottom diagonal fold line 18b connects the front second bottom intersection point Hb to the front first bottom intersection point Gb, which is the intersection point of the front first vertical fold line 12b and the front fourth horizontal fold line 25b, and extends further to the front side edge 11b. The intersection point of the front side edge 11b and the front bottom diagonal fold line 18b is the end point of the front bottom diagonal fold line 18b.

The diagonal fold line 17b on the top of the front side may be located near the intersection point Fb of the second top of the front side, but not in contact with it. Furthermore, the diagonal fold line 18b on the bottom of the front side may be located near the intersection point Hb of the second bottom of the front side, but not in contact with it.

The oblique fold line 17b on the top of the front side does not contact the intersection point Eb of the first top of the front side, and may not be present in the vicinity thereof. Alternatively, the oblique fold line 17b on the top of the front side may not be present between the intersection point Eb of the first top of the front side and the side edge 11b of the front side.
Furthermore, the oblique fold line 18b on the front bottom side does not contact the first bottom intersection point Gb on the front side and may not be present in the vicinity thereof. Alternatively, the oblique fold line 18b on the front bottom side may not be present between the first bottom intersection point Gb on the front side and the front side edge 11b.

By positioning the above-mentioned oblique fold lines on each front side and their intersections close to each other without touching, sufficient bending performance is maintained while preventing excessive concentration of fold lines in specific locations, preventing a decrease in the strength of the laminated sheet of front side blank plate 10b.

On both the left and right side edges 11b of the front blank plate 10b, a front side edge seal margin 36b is formed via the front first vertical fold line 12b.

In addition, a front bottom seal margin 37b is formed at the front bottom edge 26b, located below the front blank plate 10b, via the front fourth horizontal fold line 25b.

Furthermore, the front blank plate 10b is provided with forming plates for each section, starting from the uppermost front edge 21b and proceeding downward.

Explaining the main components, a front upper overlapping plate 34b is provided below the central region of the front upper edge 21b. A front top panel 33b is connected to the bottom of this front upper overlapping plate 34b via a front first horizontal fold line 22b. A front wall panel 31b is connected to the bottom of this front top panel 33b via a front second horizontal fold line 23b. A front bottom panel 35b is connected to the bottom of this front wall panel 31b via a front third horizontal fold line 24b.

Furthermore, side panels 41b of the top portion of the front side are connected to the outside of both the left and right sides of the upper front overlapping panel 34b via the second vertical front folding line 13b.

Furthermore, protruding portions 38b of the front top panel 33b are connected to the outside of both the left and right sides via the second vertical folding line 13b of the front top panel.

Furthermore, front side panels 32b are connected to the outside of both the left and right sides of the front wall panel 31b via the front second vertical bending line 13b.

Furthermore, front bottom protrusion margins 43b are connected to the outside of both the left and right sides of the front bottom panel 35b via the front second vertical fold line 13b.

Furthermore, a front top protrusion margin 38b is connected to the bottom of each of the top side panels 41b via a first horizontal fold line 22b. A front side panel 32b is connected to the bottom of each of the top protrusion margins 38b via a second horizontal fold line 23b. A front bottom protrusion margin 43b is connected to the bottom of each of the side panels 32b via a third horizontal fold line 24b.

Bottom seal margins 37b are connected to the bottom of the front bottom panel 35b and the front bottom protrusion margins 43b on both sides of it.

The front side edge seal margins 36b are connected to the left and right outer sides of the front top side panels 41b, front top protrusion margins 38b, front side panels 32b, and front bottom protrusion margins 43b via the front first vertical fold line 12b.

Furthermore, above the front zipper tape joint 52b, a front opening hook 55b is provided, consisting of a front recessed horizontal line 551b that crosses between the left and right front second vertical fold lines 13b at the shortest.

In this embodiment, the process of adding fold lines to the blank sheet 10 (score processing) is performed after the laminated sheet 78 is completed, and then the laminated sheet is fed to a machine that manufactures the resealable paper containers 90. Alternatively, the score processing may be performed on the machine that manufactures the resealable paper containers 90.

As the method for forming the creasing lines, an appropriate method is adopted from among known methods such as a platen method and a rotary die method.
The laminated sheet 78 may be cut into sheets before the scoring process is performed, or the laminated sheet 78 may be supplied to the scoring process in a roll form.

Next, a punching process for punching the laminated sheet 78 to produce the blank plate 10 will be described. For the punching process, an appropriate method is selected from known methods such as a platen method or a rotary die method. The blank plate 10 may be formed directly from the rolled laminated sheet 78, or the sheet may be cut into sheets and then punched.
The order of the creasing and punching processes does not matter, and they can be done simultaneously.

Alternatively, the roll-shaped laminated sheet 78 slit to a predetermined roll width may be fed to a machine that manufactures resealable paper containers 90, and the roll-shaped laminated sheet 78 may be cut in the transverse direction to produce the blank plate 10.

Furthermore, the rear blank plate 10a is line-symmetrical and has the same shape as the front blank plate 10b. In other words, the blank plates are nearly identical in shape, but with the layer structure reversed.

Figure 5 is a front view showing the shape of a resealable paper container (flat state) 91 at an intermediate stage when manufacturing a resealable paper container 90 using the blank plate 10 shown in Figures 4A and 4B. The topmost part is the upper edge 21b of the front blank plate 10b shown in Figure 4B, and on its back side is the back blank plate 10a. The back blank plate 10a cannot be seen with the naked eye, but when viewed through it, it has approximately the same shape as the front blank plate 10b.

In Figure 5, the rear blank plate 10a and the front blank plate 10b are overlapping, and since each component has the same positional relationship when viewed through the drawing, within the scope of manufacturing variations, the notation and subscripts for the front side may be omitted in the explanation.

Figure 13A shows an enlarged view of the top of the resealable paper container (flat state) 91 at an intermediate stage. This is an enlarged view of area A shown in Figure 5. A horizontal concave line 551 is provided on the upper side of the zipper tape 61, crossing between the left and right side edge portions 11. The horizontal concave line 551 is one form of the opening trigger 55, which will be explained later.

The upper overlapping plate 34 and the side plate 41 on the top of the front side are provided with an upper seal portion 53 as a transverse sealing means, an easy-open processing line 51, a recessed horizontal line 551, and a zipper tape joint portion 52, in that order from the upper edge 21, at a predetermined position where the two blank plates 10 overlap each other.

The upper seal portion 53 is provided at or near the upper edge portion 21 of the upper overlapping plate 34 and each of the top side plates 41 .
If the upper seal portion 53 is approximately parallel to the upper edge portion 21, the length of the upper seal portion 53 can be shortened and no waste occurs in the blank plate 10.

The upper seal portion 53, which serves as a transverse sealing means, is formed by joining the opposing front and back upper seal portions 53b and 53a. The joining is performed across the entire width of the upper edge 21 or the vicinity of the upper edge 21 of the resealable paper container 90, thereby maintaining the airtightness of the resealable paper container 90.

Additionally, it is desirable that the upper seal portion 53 be approximately parallel to the upper edge portion 21. Furthermore, it is desirable that the zipper tape joint portion 52 be approximately parallel to the upper edge portion 21.
In such a configuration, it is easy to open and close the zipper tape 61 and to take out the contents. Also, the length of the zipper tape 61 can be shortened.

<Easy-to-open processing line>
The easy-open processing line 51 will be described.
The upper front overlapping plate 34b and the side plate 41b of the top front portion may be provided with an easy-to-open front processing line 51b as an opening means.
By providing the easy-open processing line 51b, the resealable paper container 90 can be opened without using tools such as scissors.

As shown in Figure 5, the easy-open processing line 51 extends from one side edge 11 of the blank sheet 10 to the other side edge 11, and is located between the upper seal portion 53 and the recessed horizontal score line 551.

A notch 77 may be provided at either end of the easy-open processing line 51; in this embodiment, the notch 77 is provided at the right side edge 11. The notch 77 may also be provided at the left side edge 11. Alternatively, notches 77 may be provided at both the left and right side edges 11. Providing the notch 77 makes initial opening easier.

By cutting the easy-open processing line 51 from one side edge (here, the right side) 11 to the other side edge (here, the left side) 11, the upper overlapping plate 34 and the side plate 41 of the top of the front side are cut across, and the upper seal portion 53 is also cut away, exposing the zipper tape 61.

When using intermittent half-cut lines or straight half-cut lines for the easy-to-open processing line 51 of the opening means, they may be formed using a normal blade method, but half-cut lines can be formed with greater precision and stability by using a method that uses laser light irradiation, ultrasonic waves, or a method known as diamond cutting.

The easy-open processing line 51 may also be in the shape of a strip with a certain width. Multiple easy-open processing lines 51 may also be provided. By providing multiple easy-open processing lines 51, it is possible to prevent the easy-open processing line 51 from cutting off in an undesired manner.

Note that depending on the material, layer structure, and easy-open processing conditions of the laminated sheet 78 of the front blank plate 10b, the easy-open processing line 51b may not be provided. Even without the easy-open processing line 51b, it may still be possible to open the package by hand.

Furthermore, if no easy-open processing line 51 is provided as described above, the container may be opened with a blade such as scissors. In this case, the intended opening line may be indicated by printing. The printing position may also be the position of the easy-open processing line 51 shown in Figures 4A and 4B. The intended opening line may not be clearly indicated on the resealable paper container 90, but may instead be indicated in an accompanying instruction manual.

<Zipper tape>
The zipper tape 61 is formed by extrusion molding a male zipper tape 61m and a female zipper tape 61f, and a male zipper tape fitting portion 63m and a female zipper tape fitting portion 63f are fitted together.

<Zipper tape joining procedure>
The procedure for assembling the zippered paper container 90 will be explained later, but here, the procedure for joining the zipper tape 61 will be explained.

In this case, the zipper tape joint 52 is the intended joint for the zipper tape 61 when assembling the zippered paper container 90.

The rear blank sheet 10a and the front blank sheet 10b are overlapped, and the side edge seal margins 36 and the upper seal portions 53 are heat-sealed.
At this time, the zipper tape 61, which has already been fitted between the male zipper tape 61m and the female zipper tape 61f and the male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f, is inserted into this portion. At the same time, the zipper tape joint portions 52 of the two blank sheets 10 are heated and pressurized from the outer surfaces thereof. The blank sheets 10 and the zipper tapes 61 are then heat-sealed (see FIGS. 18A and 18B).

The method of joining the zipper tape 61 to the blank plate 10 is not limited to heat sealing as described above, and other methods such as adhesive or adhesive tape may also be used.

By heat-sealing the zipper tape 61 in this manner, there is less misalignment of the heat seal compared to a method in which the male zipper tape 61m and the female zipper tape 61f are separately heat-sealed to the zipper tape joint 52, and the attachment process is simplified, allowing the zipper tape 61 to be attached with high production efficiency.

<Laminated sheet of blank plates>
As described above, the laminated sheet 78 used for the blank plate 10 is a laminated sheet 78 that has at least a paper base layer 782 laminated thereon and at least the innermost thermoplastic resin layer 783 laminated thereon with a thermoplastic resin such as polyethylene, but if necessary, the intermediate layer can be provided with a barrier layer 785 against water vapor, oxygen, and other substances, or a strength-enhancing layer.

The paper base layer 782 will now be described. The paper base layer 782 is preferably made of paper that is rigid and does not easily crack when folded along a folding line, but is not particularly limited thereto, and an appropriate paper can be selected and used in consideration of water resistance (size) and other factors depending on the contents to be filled into the resealable paper container 90.
As specific examples, high-quality paper, cup base paper, milk carton base paper, etc. can be suitably used, and the appropriate basis weight is in the range of 80 to 320 g/m ² .

This section describes the thermoplastic resin layer (sealant layer) used in the innermost layer, and, if necessary, the outermost layer and intermediate layer. Resins that can be used for the thermoplastic resin layer (sealant layer) include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-α-olefin copolymers polymerized using a single-site catalyst, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid random copolymer (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ionomers, polypropylene and its copolymers, and polyester-based resins. From these, the most appropriate resin can be selected and used depending on the contents to be filled and the storage and usage conditions.

Of the thermoplastic resins listed above, ethylene-methyl acrylate copolymer (EMA) and ethylene-methacrylic acid random copolymer (EMAA) in particular exhibit excellent thermal stability during processing such as extrusion coating, adhesion to various substrates, and low-temperature heat sealing properties, as well as excellent thin-film formability. Therefore, it is easy to extrusion coat and laminate the outermost thermoplastic resin layer, which does not require a large thickness, at a relatively thin thickness of, for example, 6 to 10 μm, which reduces the proportion of plastic material used while also providing cost benefits.

These thermoplastic resin layers (sealant layers) for the innermost layer, and optionally the outermost and intermediate layers, can be laminated by extrusion coating the resin onto the laminate surface after subjecting it to an easy-adhesion treatment such as anchor coating, corona treatment, or flame (flame) treatment as required. Alternatively, the thermoplastic resin can be pre-formed into a film and then laminated by bonding the film together using known methods such as dry lamination or extrusion lamination (sandwich lamination).

When a barrier layer 785 is laminated as an intermediate layer of the laminate sheet 78, the barrier layer 785 can be made of a metal foil such as aluminum foil, or a vapor-deposited film of a metal or inorganic oxide such as aluminum, silica, or alumina vapor-deposited to a thickness of 20 to 100 nm on a substrate film such as biaxially oriented PET film, biaxially oriented nylon film (ONy film), or biaxially oriented polypropylene film (OPP film). Alternatively, saponified ethylene-vinyl acetate copolymer (hereinafter sometimes referred to as EVOH) film, biaxially oriented nylon MXD6 film, polyacrylonitrile film, or PET film, ONy film, or OPP film with a polyvinylidene chloride coating layer can be used.

It is usually preferable to laminate such a barrier layer 785 on the inner surface of the paper base layer 782, as this allows for effective use of its barrier properties. However, if a metal foil such as aluminum or a metal-deposited film is used for the barrier layer 785, the metallic effect can also be utilized in the design, so it can also be laminated on the outer surface of the paper base layer 782. The barrier layer 785 can be easily laminated using known methods such as dry lamination or extrusion lamination (sandwich lamination).

The layer structure of the laminated sheet 78 of the blank plate 10 of the resealable paper container 90 of this embodiment is shown as an example. Cross-sectional views of the laminated sheet 78 are shown in Figures 12A, 12B, 12C, and 12D.

FIG. 12A is a cross-sectional view of a laminated sheet 78 of the blank plate 10 made up of three layers, the layer structure of which is as follows, with "/" indicating the boundary between adjacent layers:
(Outer surface) Outermost thermoplastic resin layer 781 / paper base material layer 782 /
Innermost thermoplastic resin layer 783 (inner surface)

FIG. 12B is a cross-sectional view of a laminated sheet 78 of the blank plate 10 consisting of two layers, the layer structure of which is as follows:
(Outer surface) Paper base layer 782 / Innermost thermoplastic resin layer 783 (Inner surface)
This is a layer structure obtained by excluding the outermost thermoplastic resin layer 781 from the three-layer blank plate 10 shown in FIG. 12A.

Furthermore, when the blank plate 10 is required to have barrier properties (water vapor, oxygen, aroma retention, etc.), it can be provided with a barrier layer 785. Fig. 12C is a cross-sectional view of a laminated sheet 78 of the blank plate 10, which is made up of five layers, and the layer structure is as follows.
(Outer surface) Outermost thermoplastic resin layer 781 / Paper base material layer 782 / Middle adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (Inner surface)

FIG. 12D is a cross-sectional view of a laminated sheet 78 of the blank plate 10 consisting of four layers, the layer structure of which is as follows:
(Outer surface) Paper base layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 /
Innermost thermoplastic resin layer 783 (inner surface)
This is a layer structure obtained by excluding the outermost thermoplastic resin layer 781 from the five-layer blank plate 10 shown in FIG. 12C.

The layers of each laminate sheet 78 are bonded together using known methods such as dry lamination, extrusion coating, or adhesives. Note that the layers used to bond the layers together may not be shown due to their thinness.

<Production of paper container with zipper>
Below, we will explain the outline of the steps from the blank plate 10 of the resealable paper container 90 to the intermediate stage resealable paper container (flat state) 91, to the intermediate stage resealable paper container (boxed state) 92, and finally to the completion of the package of the resealable paper container 90 filled with the contents.

<Preparation of intermediate stage paper container with zipper (flat state)>
When the two blank plates 10 described above are overlapped, a zipper tape 61 having a male zipper tape 61m and a female zipper tape 61f fitted together in advance is inserted into the position where the zipper tape joints 52 overlap, and the zipper tape joints 52 of the outer surfaces of the two blank plates 10 are heated and pressurized to be heat-sealed.

Next, the inner surfaces of the upper seal portion 53 are heat-sealed, and the inner surfaces of the seal margins 36 on each side edge adjacent to the side edge portion 11 of the blank plate 10 are heat-sealed. The intermediate stage resealable paper container (flat state) 91 is then formed into a bag shape with an opening at the lower edge portion 26.

A notch 77 may also be provided at each end of the easy-open processing line 51 (at the points where it contacts the side edges on both sides). The notch 77 may also be provided at one of the ends.

The resealable paper container 90 is not particularly limited in its actual production, but to improve productivity, it is possible to use equipment that assembles the paper container, fills it with the contents, and seals each joint in-line.

In this device, a long printed laminated sheet 78 wound up in a roll can be unwound, and with the paper containers connected horizontally, the following processes can be performed: processing of folding lines, insertion and heat sealing of zipper tape 61, heat sealing of the side edge seal margins 36, heat sealing of the upper seal portion 53, punching of notches 77, etc.

However, the order of the steps may be different from that described above as long as the desired resealable paper container 90 is obtained.

Incidentally, Figures 18A and 18B show enlarged cross-sectional views of the joining portion of the zipper tape 61, where the zipper tape 61 and blank plate 10 are joined in an intermediate stage of a zippered paper container (flat state) 91. The cut portion is shown at cross-sectional position C-C in Figure 5. Here, the blank plate 10 is exemplified by the four-layer laminate sheet 78 in Figure 12D.

18A, a female zipper tape 61f is joined to a front blank plate 10b as a front zipper tape 61b. The female zipper tape 61f includes a female zipper tape body portion 62f joined to the blank plate 10b and a female zipper tape fitting portion 63f having a recess that fits with the male zipper tape 61m.
A male zipper tape 61m is joined to the back blank plate 10a as the back zipper tape 61a. The male zipper tape 61m includes a male zipper tape body 62m joined to the blank plate 10a and a male zipper tape fitting portion 63m having a convex portion that fits with the female zipper tape 61f.

18B, a male zipper tape 61m is joined to a front blank plate 10b as a front zipper tape 61b. The male zipper tape 61m includes a male zipper tape body 62m joined to the blank plate 10b and a male zipper tape fitting portion 63m having a convex portion that fits with a female zipper tape 61f.
A female zipper tape 61f is joined to the back blank plate 10a as the back zipper tape 61a. The female zipper tape 61f includes a female zipper tape body 62f joined to the blank plate 10a and a female zipper tape fitting portion 63f having a recess that fits with the male zipper tape 61m.

Whether the male zipper tape 61m or the female zipper tape 61f is joined to the front blank plate 10b is determined appropriately based on the required performance of the zippered paper container 90 and the specifications of the manufacturing equipment for the zippered paper container 90.

<Production of intermediate stage paper container with zipper (box state)>
A mandrel is inserted through the opening at the bottom 73 of this intermediate stage zippered paper container (flat state) 91, leaving the upper overlapping plate 34, and the top panel 33 below it is spread out front and back by the first horizontal fold line 22, causing the upper overlapping plate 34 to stand upward.

Here, to ensure that the ridge portion 72d of the body portion 72 is bent properly, an auxiliary member may be brought into contact with (including abutment against) the ridge portion 72d from the inner and/or outer sides of the body portion 72.

Below the upper stacking plate 34, a top portion 71 formed by the top panel 33 and a flat body portion 72 are formed, forming a resealable paper container (standing state) 92 in the intermediate stage, with the bottom portion 73 opening in a roughly rectangular shape. At this stage, the upper stacking plate 34 stands upright, as shown in Figure 6.

In the design, the horizontal cross-sectional shape of the body 72 and the shape of the opening of the bottom 73 are assumed to be rectangular, but because the resealable paper container 90 is made of a flexible laminated sheet 78 primarily made of paper, they are made approximately rectangular, even if they are not perfectly rectangular.

<Forming and filling of paper containers with zippers>
Next, the upper overlapping plate 34 standing upward is bent to the back side (towards the back top panel 33a) and laid down, and the top protrusions 74 protruding on both the left and right sides are bent toward the side panels 32 and joined to the body 72.
At this time, the folding portion 76 of the top side protrusion 74 is folded, and in order to ensure that the folding process of the top side protrusion folding line 15 of the top side 71 is carried out, an auxiliary member may be brought into contact with the vicinity (including abutment) of the top side protrusion folding line 15 from the inner and/or outer side of the top side 71.

The top protrusion 74 may be joined to the body 72 by using an adhesive (hot melt, etc.), adhesive tape, mechanical joining (engagement, joining tools), etc. Also, when a thermoplastic resin layer (sealant layer) is provided on the outermost layer of the blank plate 10, the thermoplastic resin layer (sealant layer) may be heat-sealed.
A similar method is used for joining the bottom side protrusion 75, which will be described later.

In addition, the tip of the top-side protrusion 74 may be joined to the body 72 of the resealable paper container 90.
Furthermore, a portion of the top-side protrusion 74 other than the tip may be joined to the body 72 of the resealable paper container 90. In this case, the tip of the top-side protrusion 74 does not need to be joined to the body 72 of the resealable paper container 90.

The bottom 73 of the intermediate stage resealable paper container (standing state) 92 formed as described above is turned upward, and the contents are filled through the open bottom 73. The bottom 73 is then folded and the bottom seal margins 37 are heat sealed together using a palm-to-palm seal.

Then, the joined bottom seal margin 37 is folded toward the back side (toward the back bottom panel 35a) and laid down, and the protruding bottom protrusions 75 on both sides are folded toward the bottom panel 35 and joined, completing the packaging of the approximately rectangular shaped resealable paper container 90.

Figure 7 is a perspective view showing a resealable paper container 90 of this embodiment. Figure 8 is a side view of the resealable paper container 90 shown in Figure 7. Figure 9 is a plan view of the resealable paper container 90 shown in Figure 7.

The resealable paper container 90 shown in FIG. 7 has an outer shape formed into a substantially rectangular parallelepiped, and has a ridge portion 72d on its body portion 72.
Since the zippered paper container 90 is made of a flexible laminated sheet 78 mainly made of paper, it does not have a perfect rectangular parallelepiped shape, so it is made to have an approximately rectangular parallelepiped shape.

<Opening operation for removing a paper container with a zipper>
The procedure for opening the top part 71 of the completed package of the resealable paper container 90 containing the contents in order to remove the contents will be described.
First, the top protrusion 74 joined to the body 72 is peeled off. Then, as the top protrusion 74 is lifted upward, the top side plate 41 stands up, and the upper overlapping plate 34 also stands up accordingly. The top side plate 41 and the upper overlapping plate 34 are then approximately flush with each other.

The easy-open processing line 51 is then manually opened starting from the notch 77 on one side (here, the right side) of the side edge 11, and cut all the way to the other side edge 11 (here, the left side). The top seal 53 is then cut off. At this stage, the zipper tape 61 has not yet been released, and the container has the shape shown in Figure 10. This shape is called a resealable paper container 93 with the top seal cut off.

FIG. 15C shows a cross section of the resealable paper container 93 from which the upper seal portion has been cut off, taken along the easy-open processing line 51, as viewed from the direction of arrow B shown in FIG.
An opening catch gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of a concave horizontal crease 551 that crosses between the left and right side edges 11, which is one aspect of the opening catch margin 55, causes each of the opening catch margins 57 above the concave horizontal crease 551 to deform outward (away from each other). The opening catch margin 55 will be described in detail later.
Since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

Next, the front opening grip 57b between the front easy-open processing line 51b and the front zipper tape 61b, and the back opening grip 57a between the back easy-open processing line 51a and the back zipper tape 61a are grasped with the human hand, and the retractable paper container 90 is spread outward, thereby opening the zipper tape 61 exposed at the easy-open processing line 51. Figure 11 shows the retractable paper container 90 with the top 71 open.

During this opening operation of the zipper tapes 61, the ends of the zipper tapes 61 on the side edge portions 11 of the blank sheets 10 are opened over substantially the entire width up to the seal margins 36 on the side edge portions.
As described above, the male zipper tape 61m and the female zipper tape 61f of the zipper tape 61 are separated, thereby forming the removal opening 56.

<Opening tab>
The opening catch 55 will now be described.
When a user opens the top 71 of the resealable paper container 90 containing the contents, the user first cuts the easy-open processing line 51 on the top 71 to expose the resealable tape 61. Then, the user grasps the front and back opening grip portions 57b and 57a with the fingers of the hand and opens the resealable paper container in the front-to-rear direction, whereby the resealable tape 61 is released.

At this time, if an opening start gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a, it becomes easy to insert a finger and the zipper tape 61 becomes easy to separate.
Furthermore, by providing the opening notch 55 on the upper side of the zipper tape 61, an opening notch gap 58 is more likely to be created when the easy-open processing line 51 is cut.

In this embodiment, a concave horizontal crease 551 that crosses between the left and right side edge portions 11 is exemplified as one embodiment of the opening catch 55. By providing the concave horizontal crease 551, which is concave when viewed from the outside of the resealable paper container 90, on the upper side of the zipper tape 61, the opening grip 57 between the zipper tape 61 and the easy-open processing line 51 deforms in the direction of opening in the front-to-rear direction. This creates an opening catch gap 58 between the front opening grip 57b and the back opening grip 57a.

Figure 15A is an end view of the top edge of a resealable paper container with the top seal removed according to the prior art. Figure 10 is a view of the resealable paper container 90 of the present disclosure, and is also used as a reference in the description herein. Figure 15A is a view seen from the direction of arrow B in Figure 10.

In FIG. 15A, side edge seal margins 836 are shown on both the left and right side edges, and a first vertical fold line 812 is shown inside the side edge seal margins 836, and a second vertical fold line 813 is shown inside the first vertical fold line 812.
Between the left and right second vertical folding lines 813 there is an upper overlapping plate 834, which is cut along the easy-open processing line 851 to reveal the opening grip 57 left on the zipper tape 861 side.

In Figure 15A, the front and back opening grip portions 57a are in contact or close proximity, with no or very little gap between them. Therefore, it is difficult to insert your fingers.

Figure 15B is a cross-sectional view taken along the cross-sectional position D-D shown in Figure 10. It is a cross-sectional view of the upper stacking plate 34 of a resealable paper container 93 in this embodiment, with the upper seal portion 53 removed.

The front-side opening grip portion 57b, located above the front-side zipper tape 61b, is provided with a front-side concave horizontal ruled line 551b, and the back-side opening grip portion 57a, located above the back-side zipper tape 61a, is provided with a back-side concave horizontal ruled line 551a.
The front side 57b above the front side horizontal line 551b is inclined toward the front side due to the front side horizontal line 551b, and the back side 57a above the back side horizontal line 551a is inclined toward the back side due to the back side horizontal line 551a.

Therefore, an opening gap 58 is formed between the cut portion of the front side easy-open processing line 51b and the back side easy-open processing line 51a.
The opening trigger gap 58 shown in FIG. 15B is the same as the opening trigger gap 58 shown in FIG. 15C, and since a finger can be easily inserted into the opening trigger gap 58, it becomes easier to release the zipper tape 61.

The opening trigger gap 58 created by either the front-side concave horizontal lines 551b or the back-side concave horizontal lines 551a also makes it easier for the zipper tape 61 to unzip. However, if the front-side concave horizontal lines 551b and the back-side concave horizontal lines 551a are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

Instead of the concave horizontal lines 551, convex horizontal lines 554 that are convex when viewed from the outside may be used. The presence of the convex horizontal lines 554 on the opening grip margin 57 causes the opening grip margin 57 to deform from a flat shape, creating an opening trigger gap 58 between the front opening grip margin 57b and the back opening grip margin 57a.

The opening catch 55 is not limited to the concave horizontal ruled line 551, but may be a convex ruled line or a rectangular embossment as described below. Furthermore, any means for generating the opening catch gap 58 between the front opening grip margin 57b and the back opening grip margin 57a may be used, for example, by attaching a spacer or applying hot melt.
Furthermore, the shape of the front opening tab 55b of the front blank plate 10b and the shape of the back opening tab 55a of the back blank plate 10a may be different.

<Second aspect of the first embodiment>
13B shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening tab 55. The opening tab 55 consists of two recessed horizontal lines 551 that cross between the left and right side edge portions 11 and is located above the zipper tape 61. A resealable paper container 90 is then produced from this blank plate 10.

The shape of the blank plate 10 other than the opening notch 55 is the same as that of the first embodiment of this mode (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also the same as being line-symmetrical.
The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of this embodiment.

The blank plates 10 of this embodiment are assembled to produce a paper container 90 with a zipper.
The easy-open process line 51 is cut, and the upper seal portion 53 is removed. Fig. 15C shows a cut surface of the easy-open process line 51 of the resealable paper container 93 from which the upper seal portion 53 formed by this procedure has been removed.

An opening gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of the concave horizontal line 551 causes each of the opening grip margins 57 above the concave horizontal line 551 to deform outward (away from each other).
Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

The opening trigger gap 58 created by either the front-side concave horizontal lines 551b or the back-side concave horizontal lines 551a also makes it easier for the zipper tape 61 to unzip. However, if the front-side concave horizontal lines 551b and the back-side concave horizontal lines 551a are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

Instead of the concave horizontal lines 551, convex horizontal lines 554 that are convex when viewed from the outside may be used. The presence of the convex horizontal lines 554 on the opening grip margin 57 causes the opening grip margin 57 to deform from a flat shape, creating an opening trigger gap 58 between the front opening grip margin 57b and the back opening grip margin 57a.

The opening catch 55 may be of various types, as described below, or of other shapes, and the opening catch 55 on the front blank plate 10b and the back blank plate 10a may have different shapes.

<Third aspect of the first embodiment>
13C shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening notch 55. The opening notch 55 is located approximately in the center of the lateral width of the resealable paper container 90, and consists of a single short, concave horizontal ruled line 551, located above the zipper tape 61.

The length of the horizontal crease 551 is preferably 10 mm or more so that it is easy to grip with the fingers of a hand, and may be approximately half the horizontal width of the body 72 of the resealable paper container 90 or less, or may be 50 mm or less. Therefore, the length of the horizontal crease 551 is not longer than necessary, and the force required to process the horizontal crease 551 is not large.

The shape of the front blank sheet 10b and the back blank sheet 10a is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5) except for the opening catch 55. The shapes of the front blank sheet 10b and the back blank sheet 10a are line-symmetrical and similar.
The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of this embodiment.

The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. The easy-open processing line 51 is then cut and the top seal portion 53 is removed. Figure 15D shows a cut surface of the easy-open processing line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

An opening gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of the concave horizontal line 551 causes each of the opening grip margins 57 above the concave horizontal line 551 to deform outward (away from each other).
Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

The opening trigger gap 58 created by either the front-side concave horizontal lines 551b or the back-side concave horizontal lines 551a also makes it easier for the zipper tape 61 to unzip. However, if the front-side concave horizontal lines 551b and the back-side concave horizontal lines 551a are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

Instead of the concave horizontal lines 551, convex horizontal lines 554 that are convex when viewed from the outside may be used. The presence of the convex horizontal lines 554 on the opening grip margin 57 causes the opening grip margin 57 to deform from a flat shape, creating an opening trigger gap 58 between the front opening grip margin 57b and the back opening grip margin 57a.

<First aspect of second embodiment>
14A shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening notch 55, which is located approximately in the center of the width of the resealable paper container 90 in the horizontal direction and consists of two short, concave vertical lines 552.

The recessed vertical crease 552 is located on the upper side of the zipper tape 61 and extends to the easy-open processing line 51. The recessed vertical crease 552 does not have to reach the easy-open processing line 51, or may extend beyond the easy-open processing line 51.
The distance between the two vertical recessed lines 552 is 20 mm. The distance between the two vertical recessed lines 552 may be 10 mm or more, or 50 mm or less.
Alternatively, the recessed vertical crease 552 may be located inside a position 10 mm inward from the second vertical fold line 13. In this way, the folding along the second vertical fold line 13 is not hindered.

The shape of the front blank plate 10b and the back blank plate 10a is the same as that of the first embodiment (see Figures 4A, 4B, and 5), except for the opening catch 55. The shapes of the front blank plate 10b and the back blank plate 10a are also line-symmetrical and similar.

The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.
The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. Then, the easy-open process line 51 is cut and the upper seal portion 53 is removed. Figure 16A shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the upper seal portion 53 has been removed.

An opening gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of the concave vertical lines 552 causes each of the opening grip margins 57 to deform outward (away from each other).
Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

The opening trigger gap 58 created by either the front side concave vertical crease 552b or the back side concave vertical crease 552a also makes it easier for the zipper tape 61 to unzip. However, if the front side concave vertical crease 552b and the back side concave vertical crease 552a are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

<Second aspect of second embodiment>
14B shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening notch 55, which is located approximately in the center of the width of the resealable paper container 90 in the horizontal direction and consists of five short, concave vertical lines 552.

The recessed vertical crease 552 is located on the upper side of the zipper tape 61 and extends beyond the easy-open processing line 51. The recessed vertical crease 552 does not have to reach the easy-open processing line 51, or it may reach the easy-open processing line 51.
The five vertical recessed lines 552 are spaced equally apart within a horizontal width (the distance between the outermost vertical recessed lines 552 on the left and right) of 20 mm. In this embodiment, the spacing is 5 mm. The horizontal width may be 10 mm or more, or 50 mm or less.
Alternatively, the recessed vertical crease 552 may be located inside a position 10 mm inward from the second vertical fold line 13. In this way, the folding along the second vertical fold line 13 is not hindered.

The shape of the front blank plate 10b and the back blank plate 10a is the same as that of the first embodiment (see Figures 4A, 4B, and 5), except for the opening catch 55. The shapes of the front blank plate 10b and the back blank plate 10a are also line-symmetrical and similar.

The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.
The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the upper seal portion 53 is removed. Figure 16B shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the upper seal portion 53 has been removed.

An opening gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of the concave vertical lines 552 causes each of the opening grip margins 57 to deform outward (away from each other).
Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

The opening trigger gap 58 created by either the front side concave vertical crease 552b or the back side concave vertical crease 552a also makes it easier for the zipper tape 61 to unzip. However, if the front side concave vertical crease 552b and the back side concave vertical crease 552a are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

<First aspect of the third embodiment>
14C shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening cutout 55, which is located approximately in the center of the lateral width of the resealable paper container 90 and consists of a concave embossed portion 553. The concave embossed portion 553 is concave when viewed from the outside of the resealable paper container 90 and is rectangular in shape.

The concave embossed portion 553 is located on the upper side of the zipper tape 61 and is in contact with the easy-open processing line 51. The concave embossed portion 553 may be located in the vicinity of the easy-open processing line 51 without reaching the easy-open processing line 51, or may be located across the easy-open processing line 51.
The size of the concave embossed portion 553 in this embodiment is 20 mm in width in the horizontal direction and 3 mm in width in the vertical direction. The concave embossed portion 553 may have a vertical width of 2 mm or more and a horizontal width of 10 mm or more. This makes it easier for the fingers to grip the opening grip.
Furthermore, the vertical width of the concave embossed portion 553 may be 10 mm or less, and the horizontal width may be 50 mm or less. By setting the dimensions in this manner, the force required to process the concave embossed portion 553 does not need to be large.

The shape of the front blank plate 10b and the back blank plate 10a is the same as that of the first embodiment (see Figures 4A, 4B, and 5), except for the opening catch 55. The shapes of the front blank plate 10b and the back blank plate 10a are also line-symmetrical and similar.

The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.
The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the upper seal portion 53 is removed. Figure 16C shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the upper seal portion 53 has been removed.

An opening gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of the concave embossed portion 553 causes each of the opening grip margins 57 to deform outward (in the direction away from each other).
Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

The opening trigger gap 58 created by either the front-side concave embossed portion 553b or the back-side concave embossed portion 553a also makes it easier for the zipper tape 61 to unzip. However, if the front-side concave embossed portion 553b and the back-side concave embossed portion 553a are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

<Second aspect of the third embodiment>
14D shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening cutout 55, which is located approximately in the center of the lateral width of the resealable paper container 90, and is composed of a concave embossed portion 553 and two concave vertical lines 552.

The concave embossed portion 553 is located on the upper side of the zipper tape 61 and straddles the easy-open processing line 51. The concave embossed portion 553 may be located near the easy-open processing line 51 but not reach it, or may be in contact with the easy-open processing line 51.

The size of the concave embossed portion 553 in this embodiment is 10 mm in width in the horizontal direction and 6 mm in width in the vertical direction.
In this embodiment, the two vertical recessed lines 552 are provided 5 mm apart on both the left and right sides of the recessed embossed portion 553. The distance between the two vertical recessed lines 552 is 20 mm.
The opening tab 55 is a combination of a concave vertical line 552 and a concave embossed portion 553, which ensures ease of opening and allows for further diversity in design.

The shape of the front blank plate 10b and the back blank plate 10a is the same as that of the first embodiment (see Figures 4A, 4B, and 5), except for the opening catch 55. The shapes of the front blank plate 10b and the back blank plate 10a are also line-symmetrical and similar.

The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.
The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. Then, the easy-open process line 51 is cut to remove the upper seal portion 53. Figure 16D shows a cut surface of the easy-open process line 51 of the resealable paper container 93 from which the upper seal portion 53 formed by this procedure has been removed.

An opening trigger gap 58 is generated between the front side opening grip margin 57b and the back side opening grip margin 57a. This is because the presence of the concave vertical lines 552 and the concave embossed portions 553 causes each of the opening grip margins 57 to deform outward (away from each other).
Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

The zipper tape 61 also becomes easier to separate at the opening trigger gap 58 formed by either the front side concave vertical lines 552b and the front side concave embossed portion 553b provided on the front side blank plate 10b, or the back side concave vertical lines 552a and the back side concave embossed portion 553a provided on the back side blank plate 10a.
However, if the front side concave vertical lines 552b and the front side concave embossed portion 553b on the front side blank plate 10b are positioned opposite the back side concave vertical lines 552a and the back side concave embossed portion 553a on the back side blank plate 10a, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to come off.

<First aspect of the fourth embodiment>
In this aspect, the concave vertical lines 552 of the first aspect of the second embodiment are replaced with convex vertical lines 555. That is, the concave vertical lines 552 shown in FIG.

The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar and line-symmetrical.
The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. The easy-open processing line 51 is then cut and the top seal portion 53 is removed. Figure 17A shows a cut surface of the easy-open processing line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

An opening trigger gap 58 is created between the front opening grip 57b and the back opening grip 57a. This is due to the recess on the inside of the convex vertical line 555. Fingers can easily be inserted into the opening trigger gap 58, making it easier to release the zipper tape 61.

The opening trigger gap 58 created by either the convex vertical lines 555b on the front side or the convex vertical lines 555a on the back side also makes it easier for the zipper tape 61 to unzip. However, if the convex vertical lines 555b on the front side and the convex vertical lines 555a on the back side are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

<Second aspect of the fourth embodiment>
In this aspect, the concave vertical lines 552 of the second aspect of the second embodiment are replaced with convex vertical lines 555. That is, the concave vertical lines 552 shown in FIG.

The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar and line-symmetrical.
The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. The easy-open processing line 51 is then cut and the top seal portion 53 is removed. Figure 17B shows a cut surface of the easy-open processing line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

An opening trigger gap 58 is created between the front opening grip 57b and the back opening grip 57a. This is due to the recess on the inside of the convex vertical line 555. Fingers can easily be inserted into the opening trigger gap 58, making it easier to release the zipper tape 61.

The opening trigger gap 58 created by either the convex vertical crease 555b on the front side or the convex vertical crease 555a on the back side also facilitates the release of the zipper tape 61. However, if the convex vertical crease 555b on the front side and the convex vertical crease 555a on the back side are positioned opposite each other, a larger opening trigger gap 58 is created, making the zipper tape 61 even more likely to release.

<First aspect of the fifth embodiment>
In this aspect, the concave embossed portion 553 of the first aspect of the third embodiment is replaced with a convex embossed portion 556. That is, the concave embossed portion 553 shown in FIG.

The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar and line-symmetrical.
The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. The easy-open processing line 51 is then cut and the top seal portion 53 is removed. Figure 17C shows a cut surface of the easy-open processing line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

An opening trigger gap 58 is formed between the front opening grip 57b and the back opening grip 57a. This is due to the recess on the inside of the convex embossed portion 556. Fingers can easily be inserted into the opening trigger gap 58, making it easier to release the zipper tape 61.

The opening trigger gap 58 created by either the front side convex embossed portion 556b or the back side convex embossed portion 556a also makes it easier for the zipper tape 61 to unzip. However, if the front side convex embossed portion 556b and the back side convex embossed portion 556a are positioned opposite each other, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

<Second aspect of the fifth embodiment>
In this aspect, the concave vertical lines 552 of the second aspect of the third embodiment are replaced with convex vertical lines 555, and the concave embossed portions 553 are replaced with convex embossed portions 556. That is, the concave vertical lines 552 shown in FIG. 14B are replaced with convex vertical lines 555, and the concave embossed portions 553 are replaced with convex embossed portions 556.

The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar and line-symmetrical.
The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. The easy-open processing line 51 is then cut and the top seal portion 53 is removed. Figure 17D shows a cut surface of the easy-open processing line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

An opening trigger gap 58 is formed between the front opening grip 57b and the back opening grip 57a. This opening trigger gap 58 is created by the concave portion on the inside of the convex vertical lines 555 and the convex embossed portion 556. Furthermore, fingers can be easily inserted into the opening trigger gap 58, making it easier to release the zipper tape 61.

The zipper tape 61 can be easily released even in the opening trigger gap 58 created by either the front side convex vertical lines 555b and front side convex embossed portions 556b on the front side blank plate 10b, or the back side convex vertical lines 555a and back side convex embossed portions 556a on the back side blank plate 10a.

However, if the front-side convex vertical lines 555b and front-side convex embossed portions 556b on the front-side blank plate 10b are positioned opposite the back-side convex vertical lines 555a and back-side convex embossed portions 556a on the back-side blank plate 10a, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to unzip.

The following examples further illustrate embodiments of the present disclosure.

Example 1
In Example 1, the resealable paper container 90 shown in FIG. 7 was produced using the blank plate 10 shown in FIGS. 4A and 4B corresponding to the first embodiment.

Two blank plates 10, as shown in Figures 4A and 4B, were prepared and overlapped with their inner surfaces aligned. As shown in Figure 5, the side edge seals 36 on both opposing sides were heat-sealed, and the top seal 53 was also heat-sealed. The zipper tape 61 was also heat-sealed. In this way, an intermediate-stage resealable paper container (flat state) 91 was produced, with the bottom seal 37 unsealed.

The laminated sheet 78 of the blank plate 10 had the following structure: Fig. 12D shows a cross-sectional view of the laminated sheet 78, but does not show a printed layer such as a picture.
The laminated sheet 78 of the blank plate 10 had the following structure.
(Outer side)
Printed layer of picture etc. (gravure printing on the outer surface of the paper base layer 782) /
Paper base layer 782 (liquid paper container base paper 150 g / m ² Nippon Paper Industries Co., Ltd.) /
Intermediate adhesive layer 784 (EMAA 20 μm Mitsui Dow Polychemical N0908N) /
Barrier layer 785 (silica-deposited PET 12 μm Dai Nippon Printing IB-PET-UBP) /
Innermost thermoplastic resin layer 783 (LDPE 40 μm Japan Polyethylene LC520)
(Inside)

A method for manufacturing the laminated sheet 78 will now be described.
First, a roll of paper substrate layer 782 was unwound, and predetermined patterns and characters were gravure printed at predetermined positions, and the paper substrate layer 782 was then wound up into a roll again.

In the next step, the rolled paper substrate layer 782 was unwound, and a barrier layer 785 (silica-deposited PET 12 μm) was laminated to the inner surface of the paper substrate layer 782 by extrusion lamination (sandwich lamination), with a molten intermediate adhesive layer 784 (EMAA 20 μm) interposed between them.

Next, an innermost thermoplastic resin layer 783 (LDPE 40 μm) was formed by extrusion lamination on the opposite side (inner side) of the paper substrate layer 782 of the barrier layer 785, and the product was then wound up into a roll again.

In addition, to improve the bonding strength between each bonding layer, anchor coating, corona treatment, flame treatment, etc. may be performed as needed. Alternatively, ozone treatment may be applied to the molten resin.

Next, the roll-shaped laminated sheet 78 is unwound and subjected to processes such as scoring and punching to complete the blank plate 10.

The zipper tape 61 that is heat-sealed and attached to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top of the zipper-equipped paper container 90 has a two-layer structure in which the heat-sealed zipper tape body 62 of both the male zipper tape 61m and the female zipper tape 61f is made up of two layers.
The zipper tape 61 has a resin layer made of LLDPE on the side that is heat-sealed to the zippered paper container 90, and a resin layer on the opposite side made of MDPE. The male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f are both made of LLDPE, and the zipper tape bodies 62 both have a width of 7 mm.

The dimensions of the back blank plate 10a and the front blank plate 10b are rectangular, 220 mm in length and 169 mm in width, and a 7 mm wide side edge seal margin 36 is provided on the side edge 11 on both sides as a seal margin at the peripheral edge.
Also, a bottom seal margin 37 having a width of 10 mm was provided on each lower edge 26 of the lower side.
Further, a sealing margin of an upper seal portion 53 having a width of 3 mm was provided near the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of the top portion.

The blank plate 10 is provided with an upper overlapping plate 34, a first horizontal folding line 22, a top panel 33, a second horizontal folding line 23, a wall panel 31, a third horizontal folding line 24, and a bottom panel 35, in this order from the upper edge 21 downward.

Furthermore, on both outer sides of the upper overlapping plate 34, side plates 41 of the top portion are provided via the second vertical folding line 13.
Furthermore, a top-side protruding portion margin 38 is provided on the outer side of both sides of the top panel 33 via the second vertical folding line 13.
Further, side panels 32 are provided on both outer sides of the wall panel 31 via second vertical folding lines 13 .
Furthermore, bottom side protrusion margins 43 are provided on the outer sides of both sides of the bottom plate 35 via the second vertical folding lines 13.

The upper overlapping plate 34 and the top side plate 41 are provided with an easy-open processing line 51, printed on the paper base layer 782 of the laminated sheet 78, in the transverse direction of the top 71 of the resealable paper container 90 as a container opening means, at a position 10 mm below the upper edge 21 that becomes the upper edge when the inner surfaces of the two blank plates 10 are aligned and overlapped, as shown in Figure 5. The easy-open processing line 51 is provided as an intermittent half-cut line.

Furthermore, below the easy-open processing line 51, a zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the top side plate 41 with a gap of 5 mm, in a direction that crosses the top 71 of the zippered paper container 90.

Furthermore, a single recessed horizontal line 551 was provided above the zipper tape 61, parallel to the zipper tape 61 and crossing the blank plate 10. The recessed horizontal line 551 was concave when viewed from the outside of the resealable paper container 90. The distance between the zipper tape 61 and the recessed horizontal line 551 was 2 mm. The reference position for the distance between the recessed horizontal line 551 was the center of the line in the cross direction, and the same was true for the other lines.

Furthermore, after joining the two blank sheets 10 and heat-sealing the zipper tape 61, the side edge seal 36, and the top seal 53 using the method described above, a notch 77 was created on the right side edge 11 of the overlapping easy-open processing line 51, and an intermediate-stage zippered paper container (flat state) 91 was produced with the bottom seal 37 left unsealed.

Next, a mandrel was inserted through the opening of the unsealed bottom seal margin 37 of this intermediate stage zippered paper container (flat state) 91, leaving the upper overlapping plate 34, and the top panel 33 below it was spread out front and back along the first horizontal fold line 22, causing the upper overlapping plate 34 to stand upright.
Below the upper overlapping plate 34, there is a top portion 71 formed by the top plate 33, followed by a body portion 72 having a substantially rectangular horizontal cross section (a plane substantially parallel to the bottom surface), and a bottom portion 73 having a substantially rectangular opening, forming an intermediate stage resealable paper container (standing state) 92 (see FIG. 6).

Then, the overlapped upper overlapping plate 34 was bent toward the rear top panel 33a. After that, the top protrusions 74 connected to both the left and right sides of the top portion 71 were joined to the body portion 72. Hot melt adhesive was used for this joining.
In addition, the tip of the top protrusion 74 is bent toward the inside of the zippered paper container 90 (downward before the top protrusion 74 is bent) to make it easier to join the top protrusion 74 and the body 72.

When joining the top protrusion 74 to the body 72, the angle formed between the top 71 and the top protrusion 74 via the bent portion 76 of the top protrusion 74 is approximately a right angle.

The dimensions of the completed paper container, which was approximately rectangular parallelepiped, were 95 mm in width, 120 mm in height, and 60 mm in depth.
In the manner described above, the resealable paper container 90 of this example was produced.

Example 2
In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the first aspect of the first embodiment, in which the concave horizontal creases 551 shown in Fig. 13A (same as Figs. 4A and 4B) were changed to convex horizontal creases 554. Similar convex horizontal creases 554 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 3
In this example, a resealable paper container 90 was produced using a blank plate 10 provided with horizontal recessed lines 551 as shown in Fig. 13B, which corresponds to the second aspect of the first embodiment. Similar horizontal recessed lines 551 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 4
In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the second aspect of the first embodiment, in which the concave horizontal creases 551 shown in Fig. 13B were changed to convex horizontal creases 554. Similar convex horizontal creases 554 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 5
In this example, a resealable paper container 90 was produced using a blank plate 10 provided with horizontal recessed lines 551 as shown in Fig. 13C, which corresponds to the third aspect of the first embodiment. Similar horizontal recessed lines 551 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 6
In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the third aspect of the first embodiment, in which the concave horizontal creases 551 shown in Fig. 13C were changed to convex horizontal creases 554. Similar convex horizontal creases 554 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 7
In this example, a resealable paper container 90 was produced using a blank plate 10 having vertical recessed creases 552 as shown in Fig. 14A, which corresponds to the first aspect of the second embodiment. Similar vertical recessed creases 552 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 8
In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the first aspect of the fourth embodiment, in which the concave vertical creases 552 shown in Fig. 14A were changed to convex vertical creases 555. Similar convex vertical creases 555 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 9
In this example, a resealable paper container 90 was produced using a blank plate 10 having vertical recessed creases 552 as shown in Fig. 14B, which corresponds to the second aspect of the second embodiment. Similar vertical recessed creases 552 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 10
In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the second aspect of the fourth embodiment, in which the concave vertical creases 552 shown in Fig. 14B were changed to convex vertical creases 555. Similar convex vertical creases 555 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 11
In this example, a resealable paper container 90 was produced using a blank plate 10 provided with a concave embossed portion 553 shown in Fig. 14C, which corresponds to the first aspect of the third embodiment. Similar concave embossed portions 553 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 12
In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the first aspect of the fifth embodiment, in which the concave embossed portion 553 shown in Fig. 14C was changed to a convex embossed portion 556. Similar convex embossed portions 556 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 13
In this example, a resealable paper container 90 was produced using a blank plate 10 provided with a concave embossed portion 553 and concave vertical lines 552 as shown in Fig. 14D, which corresponds to the second aspect of the third embodiment. Similar concave embossed portions 553 and concave vertical lines 552 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

Example 14
In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the second aspect of the fifth embodiment, in which the concave embossed portions 553 shown in Fig. 14D were changed to convex embossed portions 556 and the concave vertical lines 552 were changed to convex vertical lines 555. Similar convex embossed portions 556 and convex vertical lines 555 were provided on the front blank plate 10b and the back blank plate 10a.
Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

<Comparative Example>
In the comparative example, a paper container 80 with a zipper shown in FIG. 2 was produced using one blank plate 81 as shown in FIG.
The external dimensions of the completed resealable paper container 80 are approximately the same as those of the embodiment.

Other aspects, such as the layer structure of the laminated sheet of the blank plate 81 and the method of manufacturing the resealable paper container 80, were the same as in Example 1.

<Evaluation>
Fifty samples each of Examples 1 to 12 and the Comparative Example were prepared and filled with snack foods.

In all samples, the upper seal of the easy-to-open processing line could be easily cut off and opened using the notch provided on the side plate of the top part as an initial opening means and the easy-to-open processing line provided on the upper overlapping plate and the side plate of the top part.
Next, the front opening grip between the front easy-open processing line and the front zipper tape, and the back opening grip between the back easy-open processing line and the back zipper tape were each grasped with a person's fingers and spread outward from the zippered paper container.

In this case, in the resealable paper containers 90 of Examples 1 to 12, an opening trigger gap 58 was formed between the front opening grip 57b and the back opening grip 57a. Fingers could be easily inserted into this opening trigger gap 58, making it easy to release the zipper tape 61.

In the comparative example of the resealable paper container 90, there was either no gap between the front and back opening grips, or only a very small gap. Therefore, it was not easy to insert fingers between the front and back opening grips. To open the container, users had to insert their fingernails or a flat tool between the front and back opening grips to pry them open, which sometimes required time to release the zipper tape 61.

In addition, the packages of the resealable paper containers 90 of Examples 1 to 12 in which the resealable tape 61 had been released as described above were tested for the ease of removing the contents and the resealability of the resealable containers.

The zipper tape 61 was easily released, opening the top of the zippered paper container 90 across almost the entire width, forming a removal opening 56. The snacks contained inside could be easily removed through the removal opening 56.

Furthermore, after removing a portion of the contents, the resealable paper containers 90 of Examples 1 to 12 could be easily resealed by reattaching the zipper tape 61. The remaining contents were then properly stored.

Furthermore, the paper mass ratio of the resealable paper container 90 of the present disclosure to the total mass of the resealable paper container 90 fully meets the standard for paper containers of 51% by mass or more.

10 Blank plate 10a Back blank plate 10b Front blank plate 11 Side edge portion 12 First vertical folding line 13 Second vertical folding line 14 Second vertical folding imaginary line 15 Top side protruding portion folding line 17 Top side diagonal folding line 18 Bottom side diagonal folding line 21 Upper edge portion 22 First horizontal folding line 23 Second horizontal folding line 24 Third horizontal folding line 25 Fourth horizontal folding line 26 Lower edge portion 31 Wall panel 32 Side panel 33 Top panel 34 Upper overlapping plate 35 Bottom panel 36 Side edge side seal margin 37 Bottom side seal margin 38 Top side protruding portion margin 41 Top side panel 43 Bottom side protruding portion margin 51 Easy-open processing line 52 Zipper tape joint portion 53 Upper seal portion 55 Opening notch portion 551 Concave horizontal creases 552 Concave vertical creases 553 Concave embossed portion 554 Convex horizontal creases 555 Convex vertical creases 556 Convex embossed portion 56 Dispensing opening 57 Opening grip 58 Opening start gap 61 Zipper tape 63 Zipper tape fitting portion 71 Top portion of zippered paper container 72 Body portion of zippered paper container 72d Ridge portion of body portion 73 Bottom portion of zippered paper container 74 Protruding portion on top portion 75 Protruding portion on bottom portion 76 Folded portion of protruding portion on top portion 77 Notch 78 Laminated sheet 781 Outermost thermoplastic resin layer 782 Paper base material layer 783 Innermost thermoplastic resin layer 784 Intermediate adhesive layer 785 Barrier layer 788 Paper base material protective layer 80 Prior art zippered paper container 81 Blank plate 81a Back blank plate 81b Front blank plate 812 First vertical folding line 813 Second vertical folding line 821 Middle horizontal folding line (half folding line)
831 Wall panel 836 Side edge seal margin 834 Upper overlapping plate 851 Easy-open processing line 856 Removal opening 857 Opening grip margin 861 Zipper tape 90 Zippered paper container of the present disclosure 91 Zippered paper container in an intermediate stage of the present disclosure (flat state)
92 Paper container with zipper in intermediate stage of the present disclosure (box state)
93 A resealable paper container of the present disclosure with the upper seal portion removed

A. Area B of the enlarged view of the resealable paper container (standing in a box) in the intermediate stage. Cross section of the easy-to-open processing line of the resealable paper container with the upper seal removed.
Observation direction (indicated by the arrow in the figure)
C Cutting position of enlarged cross section of zipper tape joint

E First top intersection (intersection of the first vertical folding line and the first horizontal folding line)
F. Second top intersection (intersection of the second vertical folding line and the second horizontal folding line)
G First bottom intersection (intersection of the first vertical fold line and the fourth horizontal fold line)
H Second bottom intersection (intersection of the second vertical fold line and the third horizontal fold line)

Claims (3)

A paper container with a zipper in which a blank plate made of a laminated sheet including a paper base layer is assembled,
The blank plates include at least a front blank plate and a back blank plate,
A top portion including an upper overlapping plate formed by overlapping and joining the front blank plate and the back blank plate to the top of the zipper-equipped paper container, and a top plate connected to the lower side of the upper overlapping plate;
Side plates of the top portion connected to both left and right sides of the upper overlapping plate;
A top portion protrusion provided on both the left and right sides of the top portion;
A body portion provided below the top portion;
a bottom portion provided below the body portion;
an upper seal portion that crosses the upper edge portions or the vicinity of the upper edge portions of the upper overlapping plate and the side plate of the top portion;
a zipper tape located below the upper seal portion and extending across the upper overlapping plate and the side plate of the top portion;
At least one of the front blank plate or the back blank plate has an opening tab on the upper edge of the zipper tape,
The opening hook portion is a ruled line,
The opening hook includes a vertical line extending in the vertical direction of the resealable paper container,
The vertical creases are formed by crease processing of the blank plate . The opening hook includes two or more vertical lines extending in the vertical direction of the resealable paper container,
The resealable paper container according to claim 1, wherein the vertical lines are positioned in the horizontal direction of the resealable paper container. A paper container with a zipper in which a blank plate made of a laminated sheet including a paper base layer is assembled,
The blank plates include at least a front blank plate and a back blank plate,
A top portion including an upper overlapping plate formed by overlapping and joining the front blank plate and the back blank plate to the top of the zipper-equipped paper container, and a top plate connected to the lower side of the upper overlapping plate;
Side plates of the top portion connected to both left and right sides of the upper overlapping plate;
A top portion protrusion provided on both the left and right sides of the top portion;
A body portion provided below the top portion;
a bottom portion provided below the body portion;
an upper seal portion that crosses the upper edge portions or the vicinity of the upper edge portions of the upper overlapping plate and the side plate of the top portion;
a zipper tape located below the upper seal portion and extending across the upper overlapping plate and the side plate of the top portion;
At least one of the front blank plate or the back blank plate has an opening tab on the upper edge of the zipper tape,
The opening hook portion is a ruled line,
The opening hook includes a vertical line extending in the vertical direction of the resealable paper container,
A method for manufacturing a paper container with a zipper, wherein the vertical lines are formed by scoring the blank plate.