JP7813456B2 - packaging container - Google Patents

Description

The present invention relates to a packaging container and a sheet material for a packaging container that is assembled by folding and pasting key points from a single sheet material. More specifically, the present invention relates to a paper packaging container that is suitable for packaging cylindrically shaped items.

Paper containers such as those described in Patent Documents 1 and 2 have been known as packaging containers for packaging cylindrically shaped items (such as toner cartridges).

Utility Model Registration No. 3172544 Published Patent Application No. 2020-128242

The paper container (1) described in Patent Document 1 is rectangular tubular and has a lid (4) at one end of the container. It is assembled by folding and gluing key points from a single piece of paper board. Because of its rectangular tubular shape, it can be stacked stably even when multiple units are stacked.

The paper container (A) described in Patent Document 2 is rectangular and cylindrical, with a lid (4) at one end of the container. It is assembled by folding and gluing key points from a single sheet of paper. The lid (4) has a protrusion to cushion any impacts that may be applied to the end of the packaging container, proposing a technology that allows the lid to be opened and closed manually when inserting or removing packaged items.

In recent years, packaging container assembly and shipping lines have begun to use robots instead of human labor, allowing for unmanned assembly, packaging, and shipping. For this reason, packaging containers made from a single sheet of metal are increasingly being used on these robotic assembly lines, as they have the advantage of being semi-finished and pre-assembled, saving space during transportation and storage.

On the other hand, when the packaged item has a generally tapered shaft shape, such as a toner cartridge, and the cross-sectional size varies, the packaged item is often wrapped in a plastic inner bag to prevent excessive acceleration from being applied to the packaged item inside the packaging container during transportation.
With this type of inner bag, even if the cross-sectional size of the shaft-shaped packaged item varies slightly along its length, the inner bag acts as a cushion to limit the movement of the packaged item, preventing it from rattling during transport and preventing unnecessary excessive acceleration from being applied to the packaged item. Therefore, even if the outer diameters of different types of toner are slightly different, such as black toner cartridges and color toner cartridges (magenta, yellow, blue), it is possible to use one common packaging container.

However, the use of such plastic inner bags increases the use of petroleum, which is a fossil fuel, and as a result, can lead to increased _CO2 emissions.Furthermore, since plastic is difficult to decompose in the natural environment, it has been found to have a negative impact on the ecosystem, such as wild animals mistaking it for food and ingesting it.For this reason, there has been a global call to refrain from using such plastic inner bags, as they do not comply with the ideas behind the Sustainable Development Goals (SDGs), which have been called for in recent years.

The objective of this invention is to provide a packaging container with a simple locking structure that can replace conventional plastic inner bags for rectangular cylindrical packaging containers that store packaged items with a generally tapered shaft shape. While maintaining the ability to freely open and close the lid by hand or robot, the packaged items with a generally tapered shaft shape can be locked without rattling inside the packaging container.

Another challenge is to provide a sheet material that can be used to create a packaging container with such an interlocking structure simply by folding and pasting.

In order to achieve the above object, the present invention provides means having the following characteristics.
(First Means)
A packaging container having a rectangular cylindrical body portion composed of four side panels for storing an article to be packaged therein, and a lid portion for closing the opening of the body portion,
The body portion has a retaining plate therein that contacts the packaged article so that the packaged article does not rattle in the gap between the body portion and the retaining plate,
The pressure plate is connected to the inside of the barrel in a cantilevered state so as to narrow the widthwise cross section of the barrel from the longitudinal loading side toward the rear side.
This allows the retaining plate to lock the packaged item having a tapered shaft shape so that it does not rattle inside the packaging container.

(Second Means)
It is also preferable that the pressing plate has a base portion disposed in contact with the side plate and a main body extending upright from the base portion via perforations.
This allows the position of the perforations to be changed depending on the specific shape of the packaged item, so that the retaining plate can be placed at any position in the cross-sectional direction of the body, effectively holding the packaged item in place.

(Third Means)
It is also preferable that the pressing plate has a notch formed along the connecting auxiliary plate from the rear end in the longitudinal direction, and that the notch connects to the perforation on the longitudinal loading side.
This allows the retaining plate to bend easily along the packaged item when its tip comes into contact with it during storage, allowing the packaged item to be tightly held down and effectively locked in place.

(Fourth Means)
It is also preferable that the pressing plate has a notch formed from the widthwise end toward the auxiliary connection plate, and that the side of the pressing plate in the widthwise direction connects to the perforation.
This allows the position of the perforations to be changed depending on the specific shape of the packaged item, so that the retaining plate can be placed at any position along the length of the body, effectively holding the packaged item in place.

(Fifth Means)
It is also preferable that the main body has a folding line formed in the longitudinal direction at approximately the center thereof.
This allows the retaining plate to bend along the fold line where the leading edge of the packaged item comes into contact, allowing the packaged item to be held down even more tightly and more effectively locked in place.

(Sixth Means)
A sheet of packaging container material made of a single sheet of paper,
The plate material includes a first side plate, a second side plate, a third side plate, a fourth side plate, a connection auxiliary plate, and a pressing plate that is continuous with the connection auxiliary plate via a fold line in the width direction,
The first side plate and the third side plate are
The end of the plate has a protruding portion extending in a trapezoidal shape in the longitudinal direction of the plate surface, and the protruding portion is connected to each of the lid connecting pieces via a folding line,
The connection auxiliary plate has a protruding portion at an end thereof extending in the longitudinal direction of the plate surface, and the protruding portion is connected to the lid connection piece via a folding line,
The second side panel has an inner lid extending from an end thereof via a fold line,
The fourth side panel has an outer lid extending from an end thereof via a fold line,
The inner lid and the outer lid are each connected to the adjacent lid connecting piece via a folding line extending in the longitudinal direction of the plate surface on the extension of the folding line.
This makes it possible to provide a sheet material for a packaging container that can be formed from a single sheet of plate material by folding and pasting it to form a packaging container that can hold an item to be packaged inside.

(Seventh Means)
Furthermore, it is preferable that the retaining plate has a base and a main body connected to the base via a perforation, and that the main body has a notch formed along the connecting auxiliary plate at its longitudinal rear end, and that the base has perforations formed so that its width narrows from the longitudinal loading side toward the rear side until it reaches the notch.
This makes it possible to provide a sheet material for a packaging container having a pressing plate at any position in the cross-sectional direction of the body portion.

(Eighth Means)
Furthermore, the pressure plate has a base and a main body connected to the base via a perforation, and a notch is formed from its widthwise end toward the connecting auxiliary plate, and the base has perforations formed so that its width narrows from near the tip of the notch toward the rear side from its longitudinal loading side to the perforation of the connecting auxiliary plate, and it is preferable that the main body has a fold line in its widthwise center from its longitudinal end to its center toward the rear side.
This makes it possible to provide a sheet material for a packaging container having a pressing plate at any position in the longitudinal direction of the body.

(Ninth Means)
The packaging container is assembled by folding the above-described plate material along each folding line and pasting required portions.
This makes it possible to manufacture a packaging container capable of holding the packaged item from a single sheet of plate material.

The packaging container of the present invention is configured as described above, so it can be locked in place without rattling inside the packaging container.

1 is a developed plan view of a packaging container according to a first embodiment of the present invention, and a plan view of a packaging container board according to a first embodiment of the present invention. 1 is a developed plan view of a packaging container according to a second embodiment of the present invention, and a plan view of a packaging container board according to a second embodiment of the present invention. 1A and 1B are a schematic side view (upper view of the paper) and a schematic front view (lower view of the paper) of first and second embodiments of the packaging container of the present invention. 1A and 1B are schematic plan views of first and second embodiments of the packaging container of the present invention. 1 is a perspective view of an end of a packaging container according to a first and second embodiment of the present invention (end closed state). FIG. 1 is a perspective view of an end portion of a packaging container according to a first and second embodiment of the present invention (end portion semi-closed state). FIG. 1 is a cross-sectional view of the first embodiment of the packaging container of the present invention taken along the AA line on the loading side (unloaded). FIG. 1 is a cross-sectional view of the first embodiment of the packaging container of the present invention when not stored, taken along the line BB from the rear side. 1 is a cross-sectional view of the first embodiment of the packaging container of the present invention when stored, taken along the line BB from the rear side. A cross-sectional view of the loading side AA of a second embodiment of the packaging container of the present invention (unloaded). 10 is a cross-sectional view of the second embodiment of the packaging container of the present invention when stored, taken along the line BB from the rear side. FIG.

Hereinafter, an example of an embodiment of a packaging container and a packaging container board according to the present invention will be described with reference to FIGS.
As shown in Figures 1 and 2, the direction in which the paperboard (side panels) are arranged is referred to as the width direction (left-right direction on the paper), and the direction perpendicular to this is referred to as the longitudinal direction (up-down direction on the paper). Regarding the longitudinal direction, the upper side of the paper may be referred to as the "insertion side" and the lower side as the "rear side." The "insertion side" refers to the side from which the contents are inserted into the body of the packaging container, and the "rear side" refers to the rear side of the body from the perspective of the inserted contents.
As shown in Figs. 3 and 4, the packaging container will be described by defining the width direction and the length direction in the same manner as the paperboard.
In addition, in the case of cardboard, each side panel is described as the first side panel, second side panel, third side panel, fourth side panel, etc., but the top, bottom, left, and right are used for convenience in distinguishing each side panel and are not limited to this.
Furthermore, packaging containers B1 and B2 of the present invention correspond to embodiments 1 and 2, respectively, and are made from corresponding paperboards b1 and b2. Therefore, common members are assigned the same numbers. This also applies between packaging containers B1 and B2 and between paperboards b1 and b2.

(overview)
As shown in the end perspective view (closed state) of Fig. 5, the end perspective view (semi-closed state) of Fig. 6, the schematic side view and schematic front view of Fig. 3, and the schematic plan view of Fig. 4, the packaging container B1 of this example comprises a rectangular tubular body 1 made up of four side panels 14, 15, 16, and 17, and lids 4, 4 that openably and closably close front and rear openings 2 of the body 1. For convenience, as shown in Figs. 3, 5, and 6, the outer lid F1 and lid connecting pieces J1, J1 connected thereto, and the inner lid F2 and lid connecting pieces J2, J2 connected thereto are collectively referred to as the lid 4.
Fig. 7 is a cross-sectional view of the first embodiment of the packaging container B1 of the present invention as seen from the loading side A-A (see Fig. 3). As shown in Fig. 9, the body 1 is formed to have a substantially rectangular prism-shaped space for storing the packaged items and a pressing plate 19 inside that prevents the packaged items from rattling when stored inside.

(packaging container)
7, the body 1 of the packaging container B1 of this example is actually composed of four side panels 14, 15, 16, and 17 that are continuous via the fold line p as described above, and an auxiliary connecting plate 18 that is continuous with the side panel 17 via the fold line p. The auxiliary side panel 18 serves as a margin for gluing when the side panel 14 is overlaid and bonded, and is also continuous with a pressing plate 19, which will be described later, via a perforation q1.
In this example, the side panels 14, 15, 16, and 17 have the same width. Therefore, their widthwise cross sections are approximately square. The auxiliary side panel 18 is an adhesive tab, and therefore is narrower than the side panels 14, 15, 16, and 17. Furthermore, the protruding portion 18p at the end has a shape that corresponds to a part of the trapezoidal shape of the other protruding portions 14p and 16p.
As shown in Figures 5 and 1, the body 1 has protrusions 14p, 16p that rise at a substantially 45-degree angle and extend in a tapered trapezoidal shape at the end 3 of a pair of opposing side panels 14, 16. As shown in Figures 6 and 1, the lid 4 has an outer lid F1 and an inner lid F2 at the end 3 of another pair of opposing side panels 15, 17 of the body 1. In this example, openable and closable lids 4 are provided at both ends of the body 1, but they may also be provided at only one end.
As shown in Figures 6 and 1, the outer lid F1 is continuous with the lid connection pieces J1, J1 via two adjacent protrusions 18p, 16p and mountain fold lines y1, y1, and the inner lid F2 is continuous with the lid connection pieces J2, J2 via two adjacent protrusions 16p, 14p and mountain fold lines y2, y2.
The lid connection pieces J1 and J2 are connected to the trapezoidal legs of the protrusions 14p, 16p, and 18p. As will be described later, when the lid 4 is opened or closed, the lid connection pieces J1 and J2 bend along mountain fold lines y1 and y2 and valley fold lines x1 and x2, respectively, thereby opening and closing the lid. For this reason, as shown in Figures 5 and 6, the lid connection piece J2 of the inner lid F2 fits inside the outer lid F1, so it has a smaller isosceles triangular shape than a trapezoid to avoid excessive interference when the lid is closed.

(Retaining plate)
Fig. 7 is a cross-sectional view of the packaging container B1 taken along line A-A as seen from the loading side. Fig. 8 is a cross-sectional view of the packaging container B1 taken along line B-B as seen from the rear side. As shown in Figs. 7 and 8, the pressing plate 19 is composed of a base 19a and a main body 19b and is provided inside the body 1.
7, 8, and 1, the auxiliary connection plate 18 contacts the inside of the side panel 14 as a glue tab and is fixed by adhesive. The base 19a is bent away from the auxiliary connection plate 18 at perforation q1 and folded so as to contact the auxiliary connection plate 18 and is fixed to the auxiliary connection plate 18 by adhesive. The main body 19b is connected to the base 19a at perforation r1.
The cross-sectional width of base 19a at the longitudinal loading end is approximately the same as or slightly narrower than connection auxiliary plate 18, and is formed so as to narrow linearly toward the rear in the longitudinal direction. Therefore, as will be described later, base 19b makes the cross-sectional area of body 3 wide at the loading end and continuously narrows toward the rear, so that base 19b acts as a guide, making it easy to insert packaged item D1 into body 3 along base 19b.

(Notch)
A notch d1 is formed on the longitudinal rear side of the base 19a, and a perforation r1 separating the base 19a from the main body 19b is connected to the bottom of this notch d1. Therefore, as shown in Figures 7 and 8, the main body 19b rises along the side panel 17 and rises cantilevered from the perforation r1 into the interior of the body 3 so as to narrow the widthwise cross section of the body 1 from the longitudinal insertion side toward the rear side. In other words, the base 19b narrows the cross-sectional area inside the body 3 where the packaged item D1 is stored.
9, because of the presence of the notch d1, the portion of the main body 19b located behind the notch d1 is not constrained by the auxiliary connection plate 18, and so when the packaged item D1 is inserted, it can bend along the packaged item and come into close contact with the packaged item D1. In particular, when a cardboard plate is used, flexibility can be easily obtained, which is preferable.
Furthermore, the portion of the main body 19b located behind the notch d1 may have a fold line (not shown) in the widthwise center from the rear end to the approximate center. This fold line makes it easier to bend at this point, allowing for a larger adjustment range for tight contact with the packaged item even if the size of the packaged item changes.

(plate material)
The packaging container B1 of this example can be manufactured by using a single plate material b1 as a material, bending and pasting this.
1 shows a development (plan view) of the plate material of this example. The side shown on the paper will be the inside of the packaging container when assembled.
This plate material b1 has side panels, namely a first side panel 14, a second side panel 15, a third side panel 16, and a fourth side panel 17, which are successively spaced apart in the width direction via fold lines p, and a connection auxiliary plate 18 is connected to the edge of the fourth side panel 17, which is located at one end (left end) in the width direction, via fold line p, and a pressure plate 19 is further connected to the edge via perforation line q1.
As will be described later, the body 1 can be formed by folding this plate material b1 along each folding line p and attaching a connecting auxiliary plate 18 to the first side panel 14. As shown in Figures 3 and 5, both ends of the body 1 formed in this manner form lids 4, 4.

(Plate material)
In this example, a paper board is used. Specifically, it is a three-layered corrugated cardboard having a core sandwiched between liner boards each having a thickness of 2 mm. The board b1 is not limited to being made of paper, and may be reinforced with resin or the like. It is preferable that the board b1 has at least the flexibility and strength to allow the packaging container to be assembled by means of folding and pasting/adhering.

(Method of manufacturing boards)
This plate material b1 can be obtained by punching out corrugated cardboard using a punching die. When punching out using a well-known punching machine, fold lines (also called creases) can also be processed. If necessary, a surface groove process can be added when processing the fold lines.

(Plates: first side plate, third side plate, and auxiliary connection plate)
As shown in FIG. 1, the first side panel 14 and the third side panel 16 are a pair of side panels that face each other when constructing the body 1, and protrusions 14p and 16p, each having an approximately isosceles trapezoidal shape, extend from an extension line of the longitudinal end E (imaginary line).
The auxiliary connection plate 18 is a side plate that constitutes the body 1 and is a plate that comes into contact with the first side plate 14 to form a glue joint. For this reason, the protrusion 18p is formed by extending a part of an isosceles trapezoid shape from an extension of the longitudinal end E of the auxiliary connection plate 18, but is cut off when it reaches the upper base. This is to avoid excessive interference when closing the lid and make it easier to open and close the lid 4.

As mentioned above, for convenience, the outer lid F1 and the outer lid connecting pieces J1, J1 connected thereto, and the inner lid F2 and the inner lid connecting pieces J2, J2 connected thereto are collectively referred to as the lid portion 4. Also, as shown in Figure 1, in the case of the plate material b1, it may be referred to as the end portion 3 of the body portion 1, which is divided at the longitudinal end E.
(Plates: second side plate, fourth side plate, and auxiliary connection plate)
Next, the second side panel 15 and the fourth side panel 17 are another pair of side panels that face each other when forming the body 1, and have fold lines z1 and z2 on the extension line of their longitudinal ends E, and the outer lid F1 and the inner lid F2 are respectively connected via these fold lines z1 and z2.
As shown in Figure 1, this longitudinal end E is an imaginary line that separates the end 3 of the board b1 from the body 1, and is indicated correspondingly on the board b1 in Figure 1. The outer lid F1 and inner lid F2, which will be described later, are attached to both ends of the second side panel 15 and the fourth side panel 17 via fold lines z1 and z2 that are provided on this line.
As will be described later, the outer lid F1 and inner lid F2 are folded at these folding lines z1 and z2 at approximately right angles to the second side panel 15 and the fourth side panel 17, respectively, to perform opening and closing operations to close the opening 2.

(Plates: outer lid and lid connection piece)
The outer lid F1, together with an inner lid F2 (to be described later), closes the opening 2 of the body 1. The outer lid F1 has a substantially square shape and size that is just large enough to close the opening 2.
As shown in Figure 1, connecting pieces J1 are connected to the left and right sides of the outer cover F1 in the width direction via fold lines x1. These connecting pieces J1, J1 are further connected to the third side panel 16 and the auxiliary connecting plate 18 via fold lines y1, respectively. In this example, fold lines x1 and y1 intersect on an imaginary line E at a substantially 45-degree angle.

(Plates: inner lid and lid connection piece)
The inner lid F2, together with the outer lid F1, closes the opening 2 of the body 1. The inner lid F1 has a substantially square shape and size that is just large enough to close the opening 2.
As shown in Figure 1, connecting pieces J2 are connected to the left and right sides of the inner lid F2 in the width direction via fold lines x2. These connecting pieces J2, J2 are further connected to the first side panel 14 and the third side panel 16 via fold lines y2. In this example, fold lines x2 and y2 intersect on imaginary line E at a substantially 45-degree angle.
(Plate: Recessed part of inner lid)
As will be described later, when opening or closing the inner lid F2, the inner lid F2 that closes the opening 2 has an approximately rectangular recess d at its tip that is large enough for a finger to fit into, making it easy to pinch and pull out the inner lid F2 that closes the opening 2 with a finger or the like.

(Lid connection details: outer lid, inner lid)
1, the outer lid connection pieces J1, J1 and the inner lid connection pieces J2, J2 connect the outer lid F1 and the inner lid F2 to the first side panel 14 and the third side panel 16, respectively, and the shape of the outer lid connection piece J1 is substantially the same as the protrusion 16p of the third side panel 16. Furthermore, since the inner lid connection piece J2 fits inside the outer lid F1, it has a smaller isosceles triangular shape than an isosceles trapezoidal shape to avoid excessive interference when the lid is closed.

When assembling the packaging container B1 and closing the opening 2 with the outer lid F1, the connecting piece J1 is folded inward at fold line z1 so that fold line y1 and fold line z1 form mountain fold lines and fold line x1 forms a valley fold line, and as a result, the outer lid F1 is folded inward at fold line z1, and the connecting piece J1 is folded along the inside of the protruding portions 14p, 16p so that fold line y1 forms a ridge line, thereby closing the opening 2. This makes it possible to freely close the opening 2.
In this example, both the front and rear openings 2 are designed to be freely closable, but it is also possible to close only one of them. In that case, to keep one of them closed at all times, it may be fixed by gluing or other means as a separate structure.

(Retaining plate)
As shown in Figure 1, the retaining plate 19 is composed of a base 19a and a main body 19b. The base 19a is connected to the auxiliary connection plate 18 via a perforation line q1 parallel to the fold line p. The main body 19b is connected to the base 19a by a perforation r1. The width of the longitudinal loading end of the base 19a is approximately the same as or slightly narrower than that of the auxiliary connection plate 18, and is linearly narrowed toward the rear in the longitudinal direction. The rear longitudinal end also has a notch d1 that connects to the perforation r1.
Therefore, when the main body 19b is assembled into the packaging container B1, it can stand up along the side panel 17 as shown in Figure 7, and can stand up in a cantilevered state so as to narrow the widthwise cross section of the body 1 from the longitudinal loading side of the body 1 toward the back side.

The notch d1 is formed in the shape of a slit from the rear end of the retaining plate 19 in the longitudinal direction toward the loading side along the folding line p which is the boundary with the auxiliary connection plate 18.
The widthwise ends of the main body 19b extend toward the rear side almost parallel to the fold lines p of each side panel, decrease slightly linearly at a longitudinal position u1 that is almost the same as the bottom of the notch d1, and reach the longitudinal end at a position v1 on the longitudinal end E. The portion from this position v1 to the point w1 where the notch d1 starts forms the longitudinal end of the main body 19b on an extension of the longitudinal end E.
The width of the main body 19b is greatest at the bottom of the notch d1. It is preferable that this maximum width be approximately the same as or slightly smaller than the width of each side panel, since this makes it easier to fit inside the body 3.
In addition, at a portion of the main body 19b located on the rear side of the notch d1 in the longitudinal direction of the plate surface, a fold line t can be provided in the center of the width direction from the rear side in the longitudinal direction to approximately the center.

(Assembly procedure)
Next, a procedure for assembling the packaging container B1 using the plate material b1 having the above-described configuration will be described.
(Assembling the body)
(1) First, for the plate material b1 shown in Figure 1, fold the retaining plate 19 along the folding line q1, and fix the base 19a and the auxiliary connection plate 18 by adhesive or other means. In this example, gluing or adhesive is preferred for fixation, but other fixing means can be used.
(2) Then, the fourth side panel 17 is folded, and the first side panel 14 is folded along the folding line p, and the connection auxiliary plate 18 is fixed to the first side panel 14 by adhesive or other means using it as an adhesive tab.
At this point, gluing of the plate material b1 is complete, and the semi-finished product is completed as a packaging container. After this, assembly is performed to complete the packaging container. Since this semi-finished product is in a folded state, it can be stored or transported in a space-saving manner.
(3) Next, wait until the bonding is complete, and then unfold the fourth side panel 17 and the connecting auxiliary panel 18 so that the fold line p and the fold line p of the second side panel 15 and the paper panel 16 form a mountain fold. This allows the body 1 to be assembled in the shape of a regular square tube, and a packaging container B1 with openings 2 on both sides is completed.

(Use as a packaging container)
When using the packaging container B1, that is, when storing the packaged item, the packaged item is loaded into the loading end and the lid portion 4 is closed.
Figure 9 shows the B-B cross section when an axially shaped packaged item D1 is loaded into packaging container B1. In this way, main body 19b bends upon contact with packaged item D1, locking packaged item D1 in place. Figure 9 also shows, in phantom lines, the case when packaged item D2, which has a smaller diameter than packaged item D1, is loaded. In this case, the main body 19b bends less to contact packaged item D2 and lock it in place.
As described above, it is possible to lock packaged items of different diameters inside the packaging container. A packaging container closed in this manner is shown in Figures 3 and 4. The state of the end when closure is complete is shown in Figure 5. Next, closure of the end will be further explained.

(End closure)
5 and 6 show how the inner lid F2 is folded at the end of the packaging container B1 of this example to close the opening 2. As shown in FIG.
FIG. 6 shows the state in which the inner lid F2 is closed (half-closed state), and FIG. 5 shows the state in which the outer lid F1 is then closed (fully closed state).

(closing the inner lid)
The state of the end portion when the inner lid F2 is closed is shown in Figure 6. As shown in Figure 6, the inner lid F2 is folded so that the fold line y2 of the connecting piece J2 is on the mountain side and the fold line x2 is on the valley side. This makes the inner lid F2 easier to fold because the fold line m2 processed in the inner lid F2 forms a valley fold. When pressed further, the connecting pieces J2, J2 are folded along the adjacent protrusions 14p, 16p, and the inner lid F2 is folded inward by 90 degrees to close the opening 2. This puts the opening 2 in a semi-closed state.

(Closing the outer lid)
The state of the end portion of the outer lid F1 when it is closed is shown in Figure 5. As shown in Figure 5, the outer lid F1 is folded so that the fold line y1 of the connecting piece J1 is on the mountain side and the fold line x1 is on the valley side. This creates a valley fold along the fold line m1 machined into the outer lid F1, making it easier to fold the outer lid F1. When pressed further, the connecting pieces J1, J1 are folded along the adjacent protrusions 16p, 18p, and the outer lid F1 is bent 90 degrees inward and overlaps the inner lid F1. This fully closes the opening 2.
In this manner, the opening 2 of this example is closed by the inner lid F2 and the outer lid F1.

When placing the packaged item inside, first assemble the body 1, then insert the packaged item through the opening 2. Once the packaged item is inside the body 1, close the inner lid F2 and then F1 in the same manner as described above.

In this way, the wall connection pieces J1, J1, J2, J2 are folded along the fold lines m1, m2 when the inner lid F2 and the outer lid F1 are opened or closed, and then can be unfolded as the lids are closed. In this way, the wall connection pieces J1, J1, J2, J2 of the body 1 can overlap with each other, thereby reinforcing the protrusions 14p, 16p.
In addition, the lid 4 is less likely to deform even if an external force such as an impact is applied to it during transportation or movement, and can act as a cushion for the packaged items inside. Therefore, with the lid 4 having such a shape, the packaged items can be stored and transported more safely than before.

(overview)
As shown in the end perspective view (closed state) of Fig. 5, the end perspective view (semi-closed state) of Fig. 6, the side view and front view of Fig. 3, and the plan view of Fig. 4, the packaging container B2 of this example comprises a rectangular tubular body 1 made up of four side panels 14, 15, 16, and 17, and lids 4, 4 that openably and closably close front and rear openings 2 of the body 1. For convenience, as shown in Figs. 3, 5, and 6, the outer lid F1 and lid connecting pieces J1, J1 connected thereto, and the inner lid F2 and lid connecting pieces J2, J2 connected thereto are collectively referred to as the lid 4.
Figure 10 is a cross-sectional view of the loading side A-A of the packaging container B2 of the second embodiment of the present invention (see Figure 3). As shown in Figure 10, the body 1 is formed to have a substantially rectangular prism-shaped space for storing the packaged item D2 and a pressure plate 20 inside that prevents the packaged item D2 from rattling when it is stored inside.
The difference from the packaging container B1 of the previous example is that the position and shape of the pressure plate 20 are different from the pressure plate 19 of the packaging container B1. Other points are almost the same as the packaging container B1. Therefore, common parts are indicated by the same reference numerals. Also, the differences will be mainly described, and the same points will not be described again.

(packaging container)
10, the body 1 of the packaging container B2 of this example is actually composed of four side panels 14, 15, 16, and 17 that are continuous via the fold line p as described above, and an auxiliary connecting plate 28 that is continuous with the side panel 17 via the fold line p. The auxiliary side panel 28 serves as a margin for gluing when the side panel 14 is overlaid and bonded, and is also continuous with the pressing plate 20, which will be described later, via perforations q2.
In this example, the first to fourth side panels 14, 15, 16, and 17 have the same width, so the cross section is approximately square. The auxiliary side panel 28 is an adhesive tab, so it is narrower than the first to fourth side panels 14, 15, 16, and 17. Furthermore, the protruding portion 28p of the end portion 3 has a shape that corresponds to a part of the isosceles trapezoid shape of the other protruding portions 14p and 16p.
As shown in Figures 1 and 5, the body 1, outer lid F1, inner lid F2, and lid connecting pieces J1 and J2 are the same as those of the packaging container B1 of the previous example.

(Retaining plate)
10 is a cross-sectional view of the packaging container B2 of this example taken along line A-A as seen from the loading side. As shown in Fig. 10 and Fig. 2, the pressing plate 20 is composed of a base 20a, a main body 20b, and a reinforcing plate 20c, and is provided inside the body 1.
10, the auxiliary connection plate 28 contacts the inside of the side panel 14 as a glue tab and is fixed by adhesive. The base 20a is bent away from the auxiliary connection plate 28 at perforation q2 and folded so as to contact the auxiliary connection plate 28 and is fixed to the auxiliary connection plate 28 by adhesive. The main body 20b is connected to the base 20a at perforation r2.

(Notch)
As shown in Fig. 2, this notch d2 is connected to the aforementioned perforation r2 at its widthwise bottom. Therefore, as shown in Fig. 10, the main body 20b rises slightly away from the side panel 17 and rises in a cantilevered manner near the rear of the body 1 so as to narrow the widthwise cross section of the body 1 from the longitudinal insertion side toward the rear. In other words, the main body 20b narrows the cross-sectional area inside the body 3 where the packaged item D2 is stored.
As shown in Figure 11, when the packaged item D2 is inserted, the main body 20b, which is located behind the notch d2, can rotate along the perforation r2 and come into close contact with the packaged item.
Furthermore, a fold line t is provided in the widthwise center of the main body 20b from the rear side in the longitudinal direction to almost the center. Because of this fold line t, the main body 20b can be easily bent at this fold line t, and can be tightly attached to the packaged items D1 and D2 with a larger adjustment width even if the size of the packaged items changes.
In addition, the longitudinal position of the notch d2 can be selected arbitrarily, so the installation position of the holding plate of the body 1 can start from any position in the width direction.

(plate material)
The packaging container B2 of this example can be manufactured by using a single plate material b2 as a material, bending and pasting this.
2 shows a development (plan view) of the plate material of this example. The side shown on the paper will be the inside of the packaging container when assembled.
This plate material b2 has side panels, namely, a first side panel 14, a second side panel 15, a third side panel 16, and a fourth side panel 17, which are successively spaced apart in the width direction via fold line p, and a connection auxiliary plate 28 is connected to the edge of the fourth side panel 17, which is located at one end (left end) in the width direction, via fold line p, and a pressure plate 20 is further connected to the edge via perforation line q2.
As will be described later, the body 1 can be formed by folding this plate b2 along each folding line p and attaching the auxiliary connection plate 28 to the first side panel 14. As shown in Figures 3 and 5, both ends of the body 1 thus formed form lids 4, 4.

(Plate material and manufacturing method)
The plate material b2 of this example is similar in material and manufacturing method to the plate material b1 of the packaging container B1 of the previous example.

(Plate material: first side plate, third side plate and connection auxiliary plate,
(Plates: second side plate, fourth side plate, and auxiliary connection plate)
(Plates: outer lid and lid connection piece)
(Plates: inner lid and lid connection piece)
(Plate: Recessed part of inner lid)
With regard to plate material b2, the first side panel, third side panel and connecting auxiliary plate, second side panel, fourth side panel and connecting auxiliary plate, outer lid and lid connecting piece, plate material: inner lid and lid connecting piece, and recess of the inner lid are the same as plate material b1 of packaging container B1.

(Retaining plate)
As shown in FIG. 2, the retaining plate 20 is composed of a base 20a, a main body 20b, and a reinforcing plate 20c.
The base 20a is surrounded by a fold line s, a perforation line q2, and a perforation line r2, and is connected to the connection auxiliary plate 28 via the perforation line q2 that is parallel to the fold line p.
The main body 20b is connected to the base 20a by perforation r2. The width of the longitudinal loading side end of the base 20a is formed to be approximately the same as or slightly narrower than the connection auxiliary plate 28, and has a notch d2 at the rear longitudinal side that connects to perforation r2. Therefore, in the assembled packaging container B2, the main body 20b stands slightly apart from the side panel 17, as shown in Figure 10, and can stand in a cantilevered state so as to narrow the widthwise cross section of the body 1 from the longitudinal loading side to the rear.

(Notch)
This notch d2 is connected to the aforementioned perforation r2 at its bottom in the width direction.
The notch d2 is formed so as to be bordered by a gentle curve so that it widens from the widthwise end of the plate material b2 of the pressure plate 20 toward the fold line q2, which is the boundary with the connection auxiliary plate 28, toward the rear in the longitudinal direction.
This curve extends to point u2 on the widthwise end of the pressing plate, which is an extension of the reinforcing plate 20c, and is further chamfered (from point v2 to point w2) so as to be parallel to perforation r2 at the corner near the longitudinal end E. This chamfer is designed to comply with the internal height restrictions, as the body 20b moves around perforation r2 as an axis when assembled into a container, and the width of the body 20b is greatest at the point of perforation r2 and this chamfer.
Furthermore, a fold line t is provided in the widthwise center of the main body 20b from the rear side in the longitudinal direction to almost the center. Because of this fold line t, the main body 20b is easily bent at this fold line t, and if the cross section of the packaged item is circular, it will come into contact with the packaged item D2 at two points, allowing it to adhere closely to the packaged item D2 with a larger adjustment width even if the size of the packaged item changes.
In addition, the longitudinal position of the notch d2 can be selected arbitrarily, so the installation position of the holding plate of the body 1 can start from any position in the width direction.

(Assembly procedure)
The assembly procedure for the plate material b2 is substantially the same as that for the plate material b1 of the packaging container B1.

(Assembling the body)
(1) First, for the plate material b2 shown in Figure 2, fold the pressing plate 20 along the folding line q2, and fix the base 20a and the connection auxiliary plate 28 by means of adhesive or the like. In this example, gluing or adhesive is preferred for fixation, but other fixing means can be used.
(2) Then, the fourth side panel 17 is folded, and the first side panel 14 is folded along the folding line p, and the auxiliary connection panel 28 is fixed to the first side panel 14 by adhesive or other means, using the auxiliary connection panel 28 as a glue tab. In this case, if the reinforcing panel 20c is glued to the fourth side panel 17, as in this example, rigidity is improved.
At this point, gluing of the plate material b2 is complete, and the semi-finished product is completed as a packaging container. After this, assembly is performed to complete the packaging container. Because this semi-finished product is in a folded state, it can be stored or transported in a space-saving manner.
(3) Next, after the bonding is complete, the fold lines p of the fourth side panel 17 and the connection auxiliary panel 18 and the fold lines p of the second side panel 15 and the paper panel 16 are unfolded so that they form a mountain fold, and the body 1 in the shape of a regular square tube can be assembled, completing the packaging container B1 with openings 2 on both sides.

(Use as a packaging container)
When using the packaging container B2, that is, when storing the packaged item, the packaged item is loaded into the loading end and the lid portion 4 is closed.
Figure 11 shows the B-B cross section where the main body 20b comes into contact when an axially shaped packaged item D2 is loaded into the packaging container B2. In this way, the main body 20b bends upon contact with the packaged item D2, locking the packaged item D2 inside the packaging container B2. The figure also shows, in phantom lines, the case where a packaged item D1 with a larger diameter than the packaged item D2 is loaded. In this case, the main body 20b bends less when it comes into contact with the packaged item D2, locking the packaged item D2 inside.
As in this example, the presence of a fold line t makes it easier for the container to bend at this point. The presence of a fold allows the container to hold onto packaged items with a larger cross-sectional area. This allows the same size packaging container to hold onto packaged items with a wider range of different diameters.

The closure of the ends of plate b2 is the same as plate b1 of packaging container B1.

The above describes one example of an embodiment of the present invention with reference to the drawings, but it goes without saying that the paper packaging container according to the present invention is not limited to the illustrated example, and various design modifications are possible within the scope of the technical concept described in the claims.

B1, B2: Packaging container 1: Body 2: Opening 3: End 4: Lid 14: First side plate (side plate), 15: Second side plate (side plate), 16 Third side plate: (side plate), 17: Fourth side plate (side plate),
18, 28: Connection auxiliary plates 19, 20: Pressing plate, 19a, 20a: Base, 19b, 20b: Main body, 20c: Reinforcement plate 14p, 16p, 18p: Projecting parts D1, D2: Object to be packaged E: Longitudinal end F1: Outer lid, F2: Inner lid J1, J2: Lid connecting piece b1, b2: Plate material (plate material for packaging container)
d: recessed portion d1, d2: notch p, s, t, x1, x2, y1, y2, z1, z2: fold lines q1, q2, r1, r2: perforation lines

Claims (9)

A packaging container (B1) comprising a rectangular cylindrical body (1) composed of four side panels for accommodating an article to be packaged therein, and a lid (4) for closing an opening (2) of the body,
The body (1) is provided with a pressure plate (19) therein that comes into contact with the packaged article so that there is no play in the gap between the packaged article and the body.
The holding plate is connected to the inside of the barrel in a cantilevered state so as to narrow the width direction cross section of the barrel from the longitudinal charging side to the inner side,
The pressing plate (19) has a base (19a) arranged in contact with the side plate and a main body (19b) extending upright from the base via a perforation (r1),
The pressure plate (19) has a notch (d1) formed along the connection auxiliary plate (18) from the rear end in the longitudinal direction, and the notch connects to a perforation (r1) on the longitudinal insertion side. A packaging container (B2) comprising a rectangular cylindrical body (1) composed of four side panels for storing an article to be packaged therein, and a lid (4) for closing an opening (2) of the body,
The body (1) is provided with a pressure plate (20) therein that comes into contact with the packaged article so that there is no play in the gap between the packaged article and the body.
The holding plate is connected to the inside of the barrel in a cantilevered state so as to narrow the width direction cross section of the barrel from the longitudinal charging side to the inner side,
The pressing plate (20) has a base (20a) arranged in contact with the side plate and a main body (20b) extending upright from the base via a perforation (r2),
The pressure plate (20) has a notch (d2) formed from the widthwise end toward the connecting auxiliary plate (28), and is connected to the perforation (r2) on the widthwise connecting auxiliary plate side. A packaging container (B1; B2) comprising a rectangular cylindrical body (1) composed of four side panels for accommodating an article to be packaged therein, and a lid (4) for closing an opening (2) of the body,
The body (1) is provided with a retaining plate (19; 20) therein that contacts the packaged article so that the packaged article does not rattle in the gap between the body and the body.
The holding plate is connected to the inside of the barrel in a cantilevered state so as to narrow the width direction cross section of the barrel from the longitudinal charging side to the inner side,
The holding plate (19; 20) has a base (19a; 20a) arranged in contact with the side plate and a main body (19b; 20b) extending and standing from the base via perforations (r1; r2),
The packaging container (B1; B2) is characterized in that the main body (19b, 20b) has a fold line provided along the longitudinal direction in the center of its width direction. A sheet of packaging container material (b1; b2) made of a single sheet of paper,
The plate material (b1; b2) is
The device comprises a first side panel (14), a second side panel (15), a third side panel (16), a fourth side panel (17), a connection auxiliary panel (18; 28) which are continuous in the width direction via a fold line (p), and a holding panel (19; 20) which is continuous with the connection auxiliary panel via perforation lines (q1; q2),
The first side plate (14) and the third side plate (16)
The end (3) has protruding portions (14p, 16p) extending in a trapezoidal shape in the longitudinal direction of the plate surface, and the protruding portions (14p, 16p) are connected to the lid connecting pieces (J2, J1) via folding lines (y2, y1) that divide the oblique sides of the trapezoid,
The connection auxiliary plate (18; 28)
The end (3) has a protruding portion (18p) extending in the longitudinal direction of the plate surface, and the protruding portion is connected to the lid connecting piece (J1) via a folding line (y1);
The second side panel (15) has an inner lid (F2) extending from its end (3) via a fold line (z2),
The fourth side panel (17) has an outer cover (F1) extending from its end (3) via a fold line (z1),
The inner lid (F2) and the outer lid (F1) are
A packaging container plate material (b1; b2) characterized in that it is connected to adjacent lid connection pieces (J2, J2, J1, J1) via fold lines (x2, x2, x1, x1) extending in the longitudinal direction of the plate surface on the extension of the fold line (p). The pressing plate (19) has a base (19a) and a main body (19b) connected to the base via a perforation (r1),
The main body (19b) has a notch (d1) formed at its rear end in the longitudinal direction along the connection auxiliary plate (18),
A sheet material (b1) of a packaging container as described in claim 4, wherein the base (19a) has perforations (r1) formed so that its width narrows linearly from the longitudinal loading side toward the rear side up to the notch (d1). The pressing plate (20) has a base (20a) and a main body (20b) connected to the base via a perforation (r2), and a notch (d2) is formed from the widthwise end of the pressing plate (20) toward the connecting auxiliary plate (28),
The base portion (20a) has a perforation (r2) formed therein so that its width narrows from the vicinity of the tip of the notch (d2) toward the rear side from the loading side in the longitudinal direction to the perforation (q2) of the connection auxiliary plate (28),
5. The sheet material (b2) of a packaging container according to claim 4, wherein the body (20b) has a fold line (t) formed in the widthwise center portion thereof from the longitudinal end to the center portion thereof toward the rear side in the longitudinal direction. A packaging container (B1; B2) assembled by folding the plate material (b1; b2) described in any one of claims 4 to 6 along each folding line and gluing the required locations. A packaging container (B1; B2) formed from the plate material (b1; b2) described in any one of claims 4 to 6, wherein the side and bottom plates of the plate material are folded along respective fold lines and combined, and a connection auxiliary plate (18, 28) is fixed to the first side plate (14, 24) as an adhesive tab. A semi-finished product of a packaging container (B1; B2) formed using the plate material (b1; b2) according to any one of claims 4 to 6, wherein a connection auxiliary plate (18, 28) is fixed to the base (19a; 19b) of the pressing plate (19, 20) folded along the folding line (q1; q2) and to the first side plate (14, 24) folded along the folding line (p).