JP7525845B2 - Packaging bag having non-adhesive area - Google Patents

Description

The present invention relates to a packaging bag that can stand upright on a support surface.

Conventionally, there is known a packaging bag that can stand on its own by spreading out a pair of lower ends of the bottom part that is folded inward (see, for example, Patent Document 1). This type of packaging bag has the entire side area integrated by bonding, and since the central lower end of the bottom part swells when an object such as granules is placed inside, it is important that the bag can stand on its own stably in this state.

The packaging bag described in Patent Document 1 has the lower ends on both the left and right sides of the bottom positioned higher than the lower end at the center of the bottom, and has a cutout between the lower ends on both the left and right sides of the bottom and the lower end at the center of the bottom that is cut out higher than the lower ends on both the left and right sides of the bottom. This ensures that when the bottom is in an expanded state, the lower ends on both the left and right sides of the bottom and the lower end at the center of the bottom are in even contact with the ground.

JP 2005-320022 A

The packaging bag described in Patent Document 1 has improved self-supporting stability, but there is room for improvement in terms of smoothly expanding the bottom.

Therefore, there is a demand for a self-supporting packaging bag whose bottom can be smoothly expanded.

a lower non-adhesive region formed of a pair of lower end portions continuous with the pair of bottom end portions, and when the bottom portion is expanded, the pair of bottom end portions and the lower end portion are spaced apart, and a bottom surface spaced apart from the placement surface is formed in a region surrounded by the pair of bottom end portions and the pair of lower end portions, the bottom end portion having a first straight portion formed in the center, a second straight portion provided on the side of the lower end portion above the first straight portion, and a concave portion recessed upward between the first straight portion and the second straight portion, and the width of the first straight portion is greater than or equal to one-fifth and less than one-third of the width of the bottom end portion.

This packaging bag has a pair of sides that have an upper adhesive region and a lower non-adhesive region that is shorter in length in the vertical direction than the upper adhesive region, and the lower non-adhesive region is composed of a pair of bottom ends and a pair of lower end portions that are continuous with each other. When the bottom is expanded, the pair of bottom ends and the lower end portions are separated, and a bottom surface that is separated from the placement surface is formed in the area surrounded by the pair of bottom ends and the pair of lower end portions. In other words, because the pair of lower end portions of the sides are not adhered, the bottom of the packaging bag can be easily expanded, and because the bottom surface is separated from the placement surface, the expanded state of the bottom can be maintained.

In addition, because the upper adhesive region is provided above the pair of unadhered lower end portions, when items are placed in the storage section, the items tend to accumulate at the bottom, and the weight of the accumulated items tends to stabilize the free-standing posture of the packaging bag. Moreover, the weight of the items accumulated at the bottom of the packaging bag causes the bottom to naturally expand. In this way, a free-standing packaging bag whose bottom can be smoothly expanded has been provided.

As another configuration, it is preferable that the vertical length of the lower end portion is greater than or equal to one-quarter and less than or equal to three-quarters of the width of the bottom end portion.

In this way, if the vertical length of the lower end is greater than or equal to one-quarter and less than or equal to three-quarters of the width of the bottom end, the bottom can be smoothly expanded. In order to make it easier to expand the bottom, the length of the lower end is set to be greater than or equal to one-quarter of the width of the bottom end, and in order to make it easier for the contents to accumulate at the bottom, the length of the lower end is set to be less than or equal to three-quarters of the width of the bottom end.

In this way, if there is a concave portion recessed upward between the first and second straight sections, the force acting on the side bottom ends to pull them toward the center when the central bottom end swells when an object is stored in it is alleviated by the concave portion. As a result, it is possible to prevent the inconvenience of only the second straight section touching the ground without the first straight section touching the ground, reducing the self-standing stability.

In this way, if the width of the first straight portion is between one-fifth and one-third of the width of the bottom end, the bag will stand stably even if the contents are unevenly distributed in the storage area. In order to ensure the stability of the packaging bag, the width of the first straight portion is set to one-fifth or more of the width of the bottom end, and in order to ensure that the concave portion has the effect of mitigating the force acting on the side bottom end to pull it toward the center, the width of the first straight portion is set to one-third or less of the width of the bottom end.

As another configuration, it is preferable that the width of the second straight portion is greater than or equal to 1/10 and less than or equal to 1/6 of the width of the bottom end portion.

In this way, if the width of the second straight portion is between one-tenth and one-sixth of the width of the bottom end, the bag will stand stably even if the contents are unevenly distributed in the storage section. In order to increase the rigidity of the second straight portion and reduce the force acting on the side bottom ends to pull them toward the center, the width of the second straight portion is set to one-tenth or more of the width of the bottom end, and in order to ensure the width of the first straight portion and increase the stability of the packaging bag, the width of the second straight portion is set to one-sixth or less of the width of the bottom end.

As another configuration, it is preferable that the vertical distance between the first straight portion and the second straight portion is set so that only the first straight portion abuts against the placement surface when the bottom portion is expanded.

In this way, if only the first straight section comes into contact with the placement surface when the bottom is expanded, the first straight section will act as a fulcrum and the container will stand stably even if the contents are unevenly distributed in the storage section.

As another configuration, when the bottom is expanded, it is preferable that the maximum dimension of the bottom surface in the expanding direction is greater than or equal to one-quarter and less than or equal to three-quarters of the width of the bottom end.

In this way, if the maximum dimension of the bottom surface in the expanding direction is configured to be between one-quarter and three-quarters of the width of the bottom end, the bottom will expand smoothly and will stand stably even if the contents are unevenly distributed in the storage section. In order to allow the bottom to expand smoothly, the maximum dimension of the bottom surface in the expanding direction is set to be one-quarter or more of the width of the bottom end, and in order to ensure that the first straight portion touches the ground and stabilizes the self-standing position, the maximum dimension of the bottom surface in the expanding direction is set to be three-quarters or less of the width of the bottom end.

FIG. 1 is a perspective view of a packaging bag containing an item to be contained therein. FIG. FIG. 11 is a perspective view of a packaging bag according to another embodiment (1). FIG. 11 is a front view of a packaging bag according to another embodiment (2). FIG. 11 is a front view of a packaging bag according to another embodiment (3).

Below, an embodiment of the packaging bag according to the present invention will be described with reference to the drawings. In this embodiment, an example in which granules are contained in a packaging bag X will be described. However, the present invention is not limited to the following embodiment, and various modifications are possible without departing from the spirit of the present invention.

As shown in Figures 1 and 2, packaging bag X is formed from a multi-layer sheet formed by laminating sheets containing synthetic resin. This packaging bag X is configured so that it can stand upright on its own in the vertical direction on the placement surface H. In the following description, the placement surface H is considered to be a horizontal plane, with the direction of gravity being the downward direction and the direction opposite to the direction of gravity being the upward direction.

The packaging bag X comprises a bottom 1 having a pair of bottom ends 11, 11, a storage section 2 for storing an object to be stored, a pair of side sections 3, 3 provided on both sides of the storage section 2 and having an upper adhesive region 31 and a lower non-adhesive region 32 that is shorter in the vertical direction than the upper adhesive region 31 and that are integrated by adhesion, and an opening section 4 provided above the storage section 2 with a fastener 41 as a boundary. The lower non-adhesive region 32 is composed of a pair of lower side ends 32A, 32A that are continuous with the pair of bottom ends 11, 11. The bottom surface 12 of the packaging bag X (the lower surface of the storage section 2) is formed by bonding the outer edge of a multi-layer sheet to the pair of bottom ends 11, 11 and the pair of lower side ends 32A, 32A by heat welding or the like.

When the bottom 1 is expanded, the pair of bottom ends 11, 11 and the pair of lower end portions 32A, 32A are separated, and the bottom surface 12 separated from the placement surface H is formed in the area surrounded by the pair of bottom ends 11, 11 and the pair of lower end portions 32A, 32A (see FIG. 2). In other words, when the bottom 1 is expanded, the bottom surface 12 is located above the lower ends of the pair of bottom ends 11, 11 and the pair of lower end portions 32A, 32A. Here, the "area surrounded by the pair of bottom ends 11, 11 and the pair of lower end portions 32A, 32A" in which the bottom surface 12 is formed includes not only the case where the bottom surface 12 is surrounded by the entire area of the pair of bottom ends 11, 11 and the pair of lower end portions 32A, 32A, but also the case where, for example, the lower end portion 32A extends to an area above the bottom surface 12, and the bottom surface 12 is surrounded by a part of the area of the pair of lower end portions 32A, 32A. The contents can be either solid or liquid, and it is preferable for them to be made up of a large number of granules.

Since the packaging bag X needs to be opened when the purchaser uses it, it is preferable that the opening section 4 is designed to be easy to open by using notches, thin lines, perforations, or a group of scars, and it is also preferable that a zipper 41 is provided for reopening. In addition, a round hole 42 is formed above the opening section 4 for hanging when displayed in a store.

The bottom end 11 of the bottom 1 has a first straight portion 11A formed in the center, a pair of second straight portions 11B provided on the lower end 32A side above the first straight portion 11A, and a pair of concave portions 11C recessed upward between the first straight portion 11A and the second straight portion 11B. The first straight portion 11A and the second straight portion 11B are formed in a straight line parallel to the placement surface H when the packaging bag X is placed on the placement surface H. The concave portion 11C is configured as an arc-shaped curve having an upper end near the center in the width direction between the first straight portion 11A and the second straight portion 11B. This concave portion 11C reduces the force acting on the side bottom end 11 to pull the bottom end 11 toward the center when the contents are placed in the bag by expanding the bottom end 11 in the center. As a result, it is possible to prevent the inconvenience that the first straight portion 11A does not come into contact with the ground and only the second straight portion 11B comes into contact with the ground, reducing the self-supporting stability.

In this embodiment, when the bottom 1 is expanded, the maximum dimension D1 in the expanding direction of the bottom surface 12 is preferably configured to be ¼ or more and ¾ or less (¼≦D1/L≦¾) of the width L of the bottom end 11, and more preferably about ½ of the width L of the bottom end 11 (for example, D1=4 cm for L=8 cm) (see Figures 1 and 2). In order to smoothly expand the bottom 1, the maximum dimension D1 in the expanding direction of the bottom surface 12 is set to ¼ or more of the width L of the bottom end 11, and in order to reliably ground the first straight portion 11A and stabilize the self-supporting posture, the maximum dimension D1 in the expanding direction of the bottom surface 12 is set to ¾ or less of the width L of the bottom end 11.

In this embodiment, the vertical separation dimension D2 between the first straight portion 11A and the second straight portion 11B is set so that when the bottom 1 is expanded, only the first straight portion 11A abuts against the placement surface H (see Figures 1 and 2). This separation dimension D2 is preferably configured to be 1/60 to 1/20 of the width L of the bottom end 11 (1/60≦D2/L≦1/20), and more preferably is approximately 1/40 of the width L of the bottom end 11 (for example, D2=2 mm for L=8 cm).

It is preferable that the width L1 of the first straight portion 11A is greater than or equal to one-fifth and less than or equal to one-third of the width L of the bottom end 11 (1/5≦L1/L≦1/3), and more preferably is about one-fourth of the width L of the bottom end 11 (for example, L=8 cm and L1=2 cm) (see FIG. 1). In order to ensure the self-supporting stability of the packaging bag X, the width L1 of the first straight portion 11A is greater than or equal to one-fifth of the width L of the bottom end 11, and in order to ensure the effect of the recessed portion 11C in mitigating the force acting on the second straight portion 11B to pull it toward the center, the width L1 of the first straight portion 11A is less than or equal to one-third of the width L of the bottom end 11.

The width L2 of the second straight portion 11B is preferably 1/10 to 1/6 of the width L of the bottom end 11 (1/10≦L2/L≦1/6), and more preferably about 1/8 of the width L of the bottom end 11 (for example, L2=1 cm for L=8 cm) (see FIG. 1). In order to increase the rigidity of the second straight portion 11B and reduce the force acting on the second straight portion 11B to pull it toward the center, the width L2 of the second straight portion 11B is set to 1/10 or more of the width L of the bottom end 11, and in order to secure the first straight portion 11A and increase the self-supporting stability of the packaging bag X, the width L2 of the second straight portion 11B is set to 1/6 or less of the width L of the bottom end 11.

The distance D3 between the upper end of the recessed portion 11C and the first straight portion 11A is preferably 1/20 to 1/12 of the width L of the bottom end 11 (1/20≦D3/L≦1/12), and more preferably about 1/16 of the width L of the bottom end 11 (e.g., D3=5 mm for L=8 cm) (see FIG. 1). In order to reduce the force acting on the second straight portion 11B pulling it toward the center, the distance D3 is set to 1/20 or more of the width L of the bottom end 11, and in order to maintain the rigidity of the bottom end 11, the distance D3 is set to 1/12 or less of the width L of the bottom end 11.

As described above, each of the pair of side portions 3, 3 has an upper adhesive region 31 and a lower non-adhesive region 32, and the lower non-adhesive region 32 is composed of a pair of lower end portions 32A, 32A that are continuous with the pair of bottom end portions 11, 11. The upper adhesive region 31 is integrated by laminating sheets and bonding them together by heat welding or the like, and the pair of lower end portions 32A, 32A are not bonded to each other as a pair of multi-layer sheets. Since the outer edge of each lower end portion 32A of the laminated sheet that constitutes the bottom surface 12 is bonded by heat welding or the like, the thickness of the upper adhesive region 31 of the side portion 3 and the thickness of one lower end portion 32A are equal. In addition, the lower end portions 32A, 32A of the pair of side portions 3, 3 are formed with tapers 32Aa that approach each other toward the second straight portion 11B (see FIG. 1). Due to this taper 32Aa, the lower end of the lower end portion 32A is not a straight line extending from the second straight portion 11B. By providing the taper 32Aa, the corners are not sharp, so there is no inconvenience of the user's hand touching the bottom end of the lower end 32A and being injured.

In this way, since the pair of lower end portions 32A, 32A of the side portions 3 are not glued, the bottom portion 1 of the packaging bag X can be easily expanded. In addition, when the bottom portion 1 is expanded, the bottom surface 12 is separated from the placement surface H, which has the effect of allowing the bottom portion 1 to maintain an expanded state. In addition, since the upper adhesive region 31 is provided above the pair of lower end portions 32A, 32A that are not glued, when contents are contained in the storage section 2, the contents are easily accumulated on the bottom portion 1, and the weight of the accumulated contents makes it easy for the packaging bag X to stand upright. Moreover, the weight of the contents accumulated on the bottom portion 1 of the packaging bag X allows the bottom portion 1 to be naturally expanded.

In this embodiment, the vertical length L3 of the lower end 32A is preferably 1/4 or more and 3/4 or less of the width L of the bottom end 11 (1/4≦L3/L≦3/4), and more preferably about 3/8 of the width L of the bottom end 11 (for example, L=8 cm and L3=3 cm) (see FIG. 1). In order to make it easier to open the bottom 1, the length L3 of the lower end 32A is 1/4 or more of the width L of the bottom end 11, and in order to make it easier for the contents to accumulate in the bottom 1, the length L3 of the lower end 32A is 3/4 or less of the width L of the bottom end 11.

[Other embodiments]
(1) As shown in FIG. 3 , when the bottom portion 1 is expanded, a vertical separation dimension D2 between the first straight portion 11A and the second straight portion 11B may be set so that in addition to the first straight portion 11A, the second straight portion 11B also abuts against the mounting surface H.
(2) As shown in Fig. 4, the taper 32Aa formed on the lower end portions 32A, 32A of the pair of side portions 3, 3 may be omitted, and a sharp corner portion may be formed at the lower end of the lower end portion 32A. As a result, the lower end of the lower end portion 32A is a straight line extended from the second straight portion 11B.

(3) A cutout may be provided by cutting out a part of the pair of lower end portions 32A, 32A of both side portions 3, 3. For example, as shown in FIG. 5(a), a cutout hole 32a (one example of a cutout) serving as a punch hole may be perforated in the pair of lower end portions 32A, 32A of both side portions 3, 3. If the peripheral portion of the cutout hole 32a formed in the pair of lower end portions 32A, 32A is heat-sealed to bond the pair of lower end portions 32A, 32A together, the vertical length (approximately L3-L4) by which the pair of lower end portions 32A are separated when the bottom portion 1 is in the expanded state shown in FIG. 2 can be adjusted. As another example of a cutout, in the case of a three-layer film of polyethylene terephthalate/aluminum/polyethylene (PET/AL/PE), the two layers of PET/AL at the lower end portions 32A, 32A may be perforated, and the PE layers may be heat-sealed to each other, leaving only the PE layer. That is, the pair of lower end portions 32A, 32A located above the notch portion (notch hole 32a in FIG. 5(a)) in the lower non-adhesive region 32 are regions that do not separate from each other when the bottom portion 1 is expanded, similar to the upper adhesive region 31. The notch portion can be provided at any position of the lower end portion 32A, and the distance L4 between the lower end of the upper adhesive region 31 and the lower end of the notch hole 32a shown in FIG. 5(a) is preferably equal to or less than half the vertical length L3 of the lower end portion 32A, and more preferably equal to or less than one-third. By providing the notch portions in the pair of lower end portions 32A, 32A in this way, the separation area of the pair of lower end portions 32A can be adjusted according to the type and weight of the contents to be contained, and the bottom portion 1 can be naturally expanded by the weight of the contents accumulated in the bottom portion 1, while the self-supporting stability of the packaging bag X can be ensured. The above-mentioned cutouts may be circular as shown in the cutout hole 32a in FIG. 5(a), or may be semicircular with a diameter portion that follows the outer edges of the pair of lower end portions 32A, 32A as shown in the cutout hole 32a in FIG. 5(b), and the shape and arrangement are not particularly limited.

(4) The concave portion 11C in the above-described embodiment is not limited to an arc-shaped curve and may be configured, for example, in a polygonal shape. As long as it is recessed upward between the first straight portion 11A and the second straight portion 11B, it may have any shape.
(5) In the above-described embodiment, the bottom end 11 of the bottom 1 may be entirely made of straight lines, without providing the recessed portion 11C. In this case, the straight lines may be formed in a stepped shape, increasing in height from the center of the bottom end 11 toward the sides.

(6) In the above embodiment, the "area surrounded by the pair of bottom ends 11, 11 and the pair of lower ends 32A, 32A" where the bottom surface 12 is formed includes not only the case where the bottom surface 12 is surrounded by the entire area of the pair of bottom ends 11, 11 and the pair of lower ends 32A, 32A, but also the case where the lower end 32A extends to an area above the bottom surface 12 and the bottom surface 12 is surrounded by a part of the area of the pair of lower ends 32A, 32A, but is not limited thereto. For example, in the state where the bottom 1 is spread as shown in FIG. 2, the case where the upper adhesive area 31 extends to the lower side of the bottom surface 12 and the pair of lower ends 32A, 32A are located below the bottom surface 12 is also included in the concept of "the area surrounded by the pair of bottom ends 11, 11 and the pair of lower ends 32A, 32A". In other words, as long as the bottom 1 of the packaging bag X can be naturally expanded due to the weight of the contents accumulated at the bottom 1, the connection boundary between the bottom surface 12 and the pair of lower end portions 32A, 32A is not particularly limited.
(7) In the above-described embodiment, the bottom end 11 of the bottom 1 and the lower end 32A of the side portion 3 are formed by stacking multi-layer sheets and bonding them by heat welding or the like, but the multi-layer sheets may be folded back and bonded by heat welding or the like. In addition, the bonding method is not limited to heat welding, and bonding by adhesive or the like may also be used.

This invention can be used for packaging bags that can stand upright on a vertical surface.

1: Bottom 2: Storage section 3: Side section 11: Bottom end 11A: First straight section 11B: Second straight section 11C: Concave section 12: Bottom surface 31: Upper adhesive region 32: Lower non-adhesive region 32A: Lower end L: Width L1 of bottom end: Width L2 of first straight section: Width L3 of second straight section: Vertical length D1 of lower end: Maximum dimension D2 in the expanding direction of bottom surface: Vertical separation dimension H between first straight section and second straight section: Placement surface X: Packaging bag

Claims (5)

A packaging bag that can stand upright in the vertical direction on a placement surface,
a base having a pair of bottom ends;
A storage section for storing an object to be stored;
a pair of side portions provided on both sides of the storage portion, the side portions having an upper adhesive region and a lower non-adhesive region that are integrated by adhesion and have a length in the up-down direction shorter than that of the upper adhesive region;
The lower non-bonded region includes a pair of lower side ends continuous with the pair of bottom ends,
When the bottom portion is expanded, the pair of bottom ends and the lower end portion are spaced apart, and a bottom surface spaced apart from the placement surface is formed in an area surrounded by the pair of bottom ends and the pair of lower end portions ,
the bottom end portion has a first straight portion formed in the center, a second straight portion provided on the lower end side and higher than the first straight portion, and a concave portion recessed upward between the first straight portion and the second straight portion,
A packaging bag , wherein the width of the first straight portion is greater than or equal to one-fifth and less than or equal to one-third of the width of the bottom end portion . The packaging bag according to claim 1, wherein the length of the lower end in the vertical direction is greater than or equal to one-fourth and less than or equal to three-fourths of the width of the bottom end. 3. The packaging bag according to claim 1 , wherein the width of the second straight portion is between 1/10 and 1/6 of the width of the bottom end portion. The packaging bag according to any one of claims 1 to 3, wherein a vertical separation dimension between the first straight portion and the second straight portion is set so that only the first straight portion abuts against the placement surface when the bottom portion is expanded. The packaging bag according to any one of claims 1 to 4 , wherein when the bottom portion is expanded, the maximum dimension of the bottom surface in the expansion direction is greater than or equal to one-fourth and less than or equal to three-fourths of the width of the bottom end portion.

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