JP6813199B2 - Packaging bag - Google Patents

Description

Regarding packaging bags equipped with reinforcing members.

Conventionally, a packaging bag in which a bag body made of a resin sheet is reinforced with a reinforcing member is known for the purpose of preventing the packaging bag from breaking in the middle and improving independence. For example, Patent Document 1 discloses a packaging bag in which the side edge portion of the bag body is covered with a columnar reinforcing member. In the packaging bag of Patent Document 1, the reinforcing member is formed on the side edge of the bag body by injection molding. Specifically, the thermoplastic resin is injected into the cavity with the side edge of the bag body inserted into the cavity for forming the reinforcing member. As a result, a columnar reinforcing member having a U-shaped cross section is formed with respect to the side edge portion of the bag body.

Japanese Unexamined Patent Publication No. 2003-19964

By the way, in the above-mentioned packaging bag, the reinforcing member is in a state of being simply fitted to the side edge portion of the bag body. Therefore, when a pulling force acts on the reinforcing member from the side edge portion to the outer side (left-right direction), the reinforcing member may be detached from the side edge portion.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a packaging bag capable of suppressing the reinforcing member from coming off from the side edge portion of the bag body.

The packaging bag according to claim 1 for achieving the above object is a packaging bag including a bag body formed in a bag shape by a resin sheet and a columnar reinforcing member for reinforcing a side edge portion of the bag body. The reinforcing member includes a first wall portion that covers one surface side of the side edge portion of the bag body, a second wall portion that covers the other surface side, the first wall portion, and the second wall portion. The bag body is provided with a third wall portion that covers the edge of the side edge portion of the bag body, and the side edge portion of the bag body is inserted by at least one of a through hole and a notch having a narrow portion on the edge side. A portion is provided, and the first wall portion of the reinforcing member is provided with a regulating column to be inserted through the insertion portion. However, the reinforcing member that can be folded back via the hinge is excluded.

According to the above configuration, when a pulling force acts on the reinforcing member from the side edge portion of the bag body to the outward side, the regulating column is caught on the peripheral edge of the insertion portion at the side edge portion. As a result, the relative movement of the reinforcing member with respect to the side edge portion is restricted, and the reinforcing member is prevented from coming off from the side edge portion.

According to the packaging bag of the present invention, it is possible to prevent the reinforcing member from coming off from the side edge portion of the bag body.

(A) is a front view of the packaging bag, and (b) is an exploded view of the packaging bag. (A) is a partially enlarged view of FIG. 1, and (b) is a sectional view taken along line 2-2. (A) is a partially enlarged view of FIG. 1, and (b) is a sectional view taken along line 3-3. (A) and (b) are diagrams showing the insertion part of the modified example. (A) and (b) are diagrams showing the regulation pillars of the modified examples.

Hereinafter, a packaging bag according to an embodiment embodying the present invention will be described with reference to the drawings.
The packaging bag includes a bag body 10 formed in a bag shape by a resin sheet, and a pair of reinforcing members 20 attached to the side edges of the bag body 10.

As shown in FIG. 1 (b), the bag main body 10 is arranged so as to sandwich the horizontally long substantially rectangular bottom sheet 11 folded in half so that the folds face upward, and the bottom sheet 11 thereof. It is composed of a pair of vertically long rectangular side sheets 12. Then, in a state where the pair of side sheet 12s are overlapped with the entire bottom sheet 11 folded in half, the left and right sides and the lower edges of the side sheet 12 are adhered to each other and have an opening at the upper side. It is formed in a bag shape.

As the bottom sheet 11 and the side sheet 12, a multi-layered sheet material having a seal layer formed on the inner surface side thereof and a non-seal layer formed on the outer surface side thereof is used. The seal layer is a layer formed of a heat-weldable resin material (for example, polyethylene, unstretched polypropylene, ethylene-vinyl acetate copolymer). Further, the non-seal layer is a material having no heat weldability (for example, paper) or a resin material having a lower heat weld property than the resin material forming the seal layer (for example, stretched polypropylene, polyester, polyamide, etc.). It is a layer formed from polyvinyl chloride, cellophane, polystyrene). The form of the non-seal layer may be a sheet (film) or a non-woven fabric.

As shown in FIG. 1A, at the left and right side edges of the bag body 10, the inner surfaces of the side sheet 12 and the inner surface of the side sheet 12 and the outer surface of the bottom sheet 11 are substantially constant along the both side edges. The side edge welding portions 13 are formed by heat welding with the width. These side edge welding portions 13 form the side edge portions of the bag body 10.

Further, in the lower edge of the bag body 10, the inner surface of the side sheet 12 and the outer surface of the bottom sheet 11 are surrounded by a curve recessed in an arc shape in the vertical direction and the left edge, right edge and lower edge of the side sheet 12. The lower edge welded portion 14 is formed by heat welding in the region. The "outer surface of the bottom sheet 11" means an outer surface in a state of being folded in half.

As shown in FIG. 1A, reinforcing members 20 formed of a resin material are attached to both side edge welded portions 13 of the bag body 10. The reinforcing member 20 is formed in a columnar shape extending along the side edge welding portion 13 of the bag body 10, and is formed in a U-shaped cross section (groove shape) covering the edge of the side edge welding portion 13 from the outside. .. Specifically, as shown in FIGS. 2 (b) and 3 (b), the reinforcing member 20 includes a first wall portion 21 that covers one surface side of the side edge welded portion 13 and other than the side edge welded portion 13. The second wall portion 22 covering the surface side and the third wall portion 23 covering the edge of the side edge welding portion 13 form a U-shaped cross section.

As shown in FIGS. 1A and 2A, in the side edge welding portion 13, the portion covered by the upper end portion of the reinforcing member 20 is a circle that penetrates the side edge welding portion 13 in the thickness direction. A hole-shaped first insertion portion 15 is provided. In the reinforcing member 20, the first regulation pillar 24 provided between the first wall portion 21 and the second wall portion is inserted into the first insertion portion 15. As shown in FIG. 2B, one end of the first regulation pillar 24 is connected to the inner surface of the first wall portion 21, and the other end is connected to the inner surface of the second wall portion 22. It is integrally formed with the wall portion 21 and the second wall portion 22.

Further, as shown in FIGS. 1A and 3A, the side edge welding portion 13 is covered by the lower end portion of the reinforcing member 20 at the portion where the side surface sheet 12 and the bottom surface sheet 11 are welded. A circular hole-shaped second insertion portion 16 that penetrates the bag body 10 in the thickness direction is provided in the broken portion. In the side edge welding portion 13, the portion where the side sheet 12 and the bottom sheet 11 are welded is sandwiched in a state where the bottom sheet 11 is folded in half, so that the two side sheets 12 are combined with four sheets. It is said that the sheets are stacked. Therefore, the second insertion portion 16 is formed so as to penetrate all four sheets.

As shown in FIG. 3B, a second regulating column 25 provided between the first wall portion 21 and the second wall portion is inserted into the second insertion portion 16 in the reinforcing member 20. One end of the second regulation pillar 25 is connected to the inner surface of the first wall portion 21, and the other end is connected to the inner surface of the second wall portion 22 to form the first wall portion 21 and the second wall portion 22. It is formed integrally.

The first regulation pillar 24 and the second regulation pillar 25 can be formed, for example, as follows. That is, first, the bag body 10 is created, and the first insertion portion 15 and the second insertion portion 16 are formed in the side edge welding portion 13. Then, the resin material is injected into the cavity with the side edge welding portion 13 of the bag body 10 inserted into the cavity for injection forming the reinforcing member 20. As a result, the first regulation column 24 and the second regulation column 25 are integrally formed together with each wall portion constituting the reinforcing member 20.

Next, the operation of this embodiment will be described.
In the packaging bag of the present embodiment, the first regulation pillar 24 and the second regulation pillar 25 integrally provided on the first wall portion 21 and the second wall portion 22 of the reinforcing member 20 are welded to the side edge of the bag body 10. It is inserted through the first insertion portion 15 and the second insertion portion 16 formed in the portion 13. Therefore, when a pulling force acts on the reinforcing member 20 from the side edge welding portion 13 of the bag body 10 to the outer side (left-right direction), the first regulation pillar 24 and the second regulation pillar 25 move to the side. It is caught on the peripheral edges of the first insertion portion 15 and the second insertion portion 16 in the edge welding portion 13. As a result, the displacement (relative movement) of the reinforcing member 20 with respect to the side edge welding portion 13 is regulated, and the reinforcing member 20 is suppressed from coming off from the side edge welding portion 13.

Next, the effect of this embodiment will be described.
(1) The packaging bag includes a bag body 10 formed in a bag shape by a resin sheet, and a columnar reinforcing member 20 for reinforcing the side edge welding portion 13 of the bag body 10. The reinforcing member 20 includes a first wall portion 21 that covers one surface side of the side edge welding portion 13 of the bag body 10, a second wall portion 22 that covers the other surface side, and a first wall portion 21 and a second wall portion 22. A third wall portion 23 that covers the edge of the side edge welding portion 13 is provided. The side edge welding portion 13 of the bag body 10 is provided with the first insertion portion 15 and the second insertion portion 16, and the first wall portion 21 of the reinforcing member 20 is provided with the first insertion portion 15 and the second insertion portion 16. The first regulation pillar 24 and the second regulation pillar 25 which are inserted into the first regulation pillar 24 are provided.

According to the above configuration, the displacement of the reinforcing member 20 with respect to the side edge welding portion 13 is regulated, and the reinforcing member 20 is prevented from coming off from the side edge welding portion 13.
(2) The base end of the first regulation pillar 24 and the second regulation pillar 25 is connected to the first wall portion 21, and the tip thereof is connected to the second wall portion 22.

According to the above configuration, the strength of the first regulation pillar 24 and the second regulation pillar 25 is increased by connecting both ends to the first wall portion 21 and the second wall portion 22. When the displacement of the reinforcing member 20 with respect to the side edge welding portion 13 is regulated, the load is concentrated on the first regulating column 24 and the second regulating column 25. As described above, by increasing the strength of the first regulation pillar 24 and the second regulation pillar 25, it is possible to prevent the first regulation pillar 24 and the second regulation pillar 25 from being bent or bent.

(3) The first insertion portion 15 and the second insertion portion 16 are formed as through holes penetrating the side edge welding portion 13 of the bag body 10.
According to the above configuration, it is possible to regulate the displacement of the reinforcing member 20 in all directions by 360 degrees in the direction along the surface of the side sheet 12. Therefore, it becomes easy to maintain the state in which the reinforcing member 20 is appropriately attached to the side edge welding portion 13 of the bag body 10.

(4) The first insertion portion 15 and the second insertion portion 16 are provided at the ends of the reinforcing member 20.
When the reinforcing member 20 comes off from the side edge welded portion 13, the end portion of the reinforcing member 20 tends to come off first, and the central portion of the reinforcing member 20 tends to gradually come off from the end portion. Therefore, by providing the first insertion portion 15 and the second insertion portion 16 at the end portion to regulate the positional deviation at the end portion of the reinforcing member 20, it is more effective that the reinforcing member 20 is detached from the side edge welding portion 13. Can be suppressed.

(5) The bag body 10 has a bag shape by adhering a bottom sheet 11 folded in half so that the folds face upward and a pair of side sheet 12 arranged so as to sandwich the bottom sheet 11. It is formed. A side edge welded portion 13 is formed as a welded portion formed by welding the side sheet 12 to each other and the side sheet 12 and the bottom sheet 11 along the side edge of the side sheet 12. A second insertion portion 16 is provided at a portion of the side edge welding portion 13 where the side surface sheet 12 and the bottom surface sheet 11 are welded.

In the side edge welding portion 13, a force that pulls inward acts when the bottom sheet 11 is deployed on the portion where the side sheet 12 and the bottom sheet 11 are welded. Further, since the bottom sheet 11 is sandwiched in the state of being folded in half, the above-mentioned part is thicker than the other parts because four sheets are overlapped together with the two side sheets 12. It is a part. From this point of view, the said portion tends to be easily detached (easily removed) from the reinforcing member 20 as compared with other portions in the side edge welded portion 13. Therefore, by providing the second insertion portion 16 at the above-mentioned portion and restricting the positional deviation of the reinforcing member 20 at the same portion, it is possible to more effectively prevent the reinforcing member 20 from coming off from the side edge welding portion 13.

(6) As the bottom sheet 11 and the side sheet 12 constituting the bag body 10, a seal layer made of a heat-welding resin material is formed on the inner surface side, and the outer surface side thereof is made of a resin material having poor heat welding property. A multi-layered resin sheet on which a non-seal layer is formed is used.

In this case, when the reinforcing member 20 is molded by injection molding, the side edge welded portion 13 of the bag body 10 is not welded to the reinforcing member 20, or even if it is welded, it is in a weak welded state. Therefore, the reinforcing member 20 is likely to come off from the side edge welded portion 13. The above-described configurations of the first insertion portion 15 and the second insertion portion 16, the first regulation pillar 24, and the second regulation pillar 25 are applied to a configuration in which the reinforcing member 20 is easily detached from the side edge welding portion 13. It is especially effective.

The present embodiment can be modified and embodied as follows. It is also possible to combine the following modification examples with each other and change the above embodiment as in the combination configuration. In the following, the first insertion portion 15 and the second insertion portion 16 are collectively referred to as an insertion portion, and the first regulation pillar 24 and the second regulation pillar 25 are collectively referred to as a regulation pillar.

-In the above embodiment, two insertion portions are provided for the side edge welding portion 13 on one side, and two regulation columns are provided for the reinforcing member 20 on one side. However, the insertion portions and the regulation columns are provided. The number is not particularly limited. For example, if the insertion portion has an elongated hole shape extending along the edge of the side edge welding portion 13, the effect of (1) above can be sufficiently obtained even if only one insertion portion and a regulating column are provided. .. Further, the positions of the insertion portions and the regulation columns are not limited to the positions corresponding to both ends of the regulation columns, and can be changed as appropriate.

-The outer peripheral shape of the insertion portion formed as the through hole is not particularly limited. For example, it may be a polygonal shape such as a triangle or a quadrangle, or a shape having irregularities on the periphery such as a cross shape or a star shape.

-As shown in FIG. 4, the insertion portion may be a notch having a narrow portion on the veranda side. Here, an example in which the second insertion portion 16 is formed as a notch will be described.
In the example shown in FIG. 4A, a trapezoidal notch is provided as the second insertion portion 16 from the left and right edges of the side edge welding portion 13 toward the inside. This notch is formed by inclining the upper edge downward from the distal end side toward the proximal end side (veranda) and the lower edge upward from the distal end side toward the proximal end side (veranda). A narrow portion 16a is provided on the side (edge side).

In the example shown in FIG. 4B, similarly, as the second insertion portion 16, a lateral T-shaped notch is provided inward from the left and right edges of the side edge welding portion 13. This notch is provided with a narrow portion 16a on the base end side (edge side) by partially recessing the base end side (edge side) of the upper edge and the lower edge.

Even when the insertion portion is a notch having a narrow portion 16a on the edge side, when a pulling force acts on the reinforcing member 20 from the side edge welding portion 13 of the bag body 10 to the outward side, the insertion portion The regulation pillar inserted into the insertion portion is caught on the peripheral edge of the insertion portion (particularly the narrow portion 16a). Therefore, as in the above embodiment, the displacement of the reinforcing member 20 with respect to the side edge welding portion 13 is restricted, and the reinforcing member 20 can be prevented from coming off from the side edge welding portion 13. Further, the insertion portion formed of the through hole and the insertion portion formed of the notch may be combined so that the first insertion portion 15 is a through hole and the second insertion portion 16 is a notch.

-As shown in FIG. 5, the regulation pillar may have a configuration in which the end portion thereof is not connected to the second wall portion 22. Here, an example in which the first regulation pillar 24 is changed will be described.
In the example shown in FIG. 5A, the first wall portion 21 is extended inward from the second wall portion 22, and the first regulating pillar 24 is provided in the extended portion. The tip of the first regulation column 24 is in a state in which the side edge welding portion 13 is projected. Even in this configuration, the effect of (1) above can be obtained. In the example shown in FIG. 5B, the return portion 24a is provided at the tip of the first regulation pillar 24 protruding from the side edge welding portion 13 in the example shown in FIG. 5A. In this case, it is possible to prevent the first regulating column 24 from coming off from the insertion portion (first insertion portion 15) of the side edge welding portion 13.

-In the above embodiment, the reinforcing member 20 is attached to substantially the entire side edge welding portion 13 along the edge of the side edge welding portion 13, but the reinforcing member is partially attached to the side edge welding portion 13. 20 may be attached. Further, a plurality of reinforcing members 20 divided into upper and lower parts may be attached to one side edge welding portion 13.

-A mouthpiece may be attached to the upper part of the bag body 10. For example, in the upper part of the bag body 10, the outer surface of the mouthpiece and the inner surface of the side sheet 12 are heat-welded, and the inner surfaces of the side sheets 12 are heat-welded to each other with a constant width to provide an upper edge welded portion. To do.

-In the above embodiment, the side edge welding portion 13 and the lower edge welding portion 14 of the bag body 10 are adhered to each other by heat welding the side sheet 12 to each other or the side sheet 12 and the bottom sheet 11. The bonding method is not particularly limited. For example, each sheet may be bonded using an adhesive or the like.

-As the resin sheet (bottom sheet 11 and side sheet 12) constituting the bag body 10, a resin sheet having seal layers formed on both sides may be used. Further, when each sheet is bonded by using an adhesive or the like, a resin sheet having a non-seal layer formed on both sides can also be used.

The resin material forming the reinforcing member 20 is not particularly limited, and a known resin material conventionally used as a reinforcing member of the packaging bag can be used.
However, among the known resin materials, the affinity with the layer formed on the outer surface side of the resin sheet constituting the side sheet 12 is low, and when the reinforcing member 20 is molded, the resin sheet constituting the bag body 10 is formed. It is particularly preferable that the resin material is not welded to or is in a weakly welded state even if it is welded. In this case, the direct bonding force between the side sheet 12 and the reinforcing member 20 becomes small. Therefore, the effect of the above (1), that is, the reinforcing member 20 is detached from the side edge welding portion 13 due to the configuration of the first insertion portion 15, the second insertion portion 16, the first regulation pillar 24, and the second regulation pillar 25. The effect of suppressing becomes more remarkable.

When the layer formed on the outer surface side of the resin sheet is a material other than resin such as paper, it corresponds to the above example regardless of the type of resin material forming the reinforcing member 20. Further, when the layer formed on the outer surface side of the resin sheet is a resin material, the above example corresponds to the case where the reinforcing member 20 is formed of a resin material different from the resin material. Specifically, when the layer formed on the outer surface side of the resin sheet is made of a resin material such as stretched polypropylene, polyester, polyamide, polyvinyl chloride, cellophane, polystyrene, etc., the resin material forming the reinforcing member 20. Examples of the resin material having a low affinity with the same layer include polypropylene, polyethylene, polyvinyl chloride, polyester, polystyrene, acrylonitrile, butadiene, styrene, polyamide, polyacetal, polycarbonate, polybutylene terephthalate, and polyphenylene sulfide. Can be mentioned.

Next, the technical idea that can be grasped from the above-described embodiment and modified example will be described.
(A) The packaging bag in which the reinforcing member is integrally molded with the side edge portion of the bag body by injection molding.

(B) The bag body is formed into a bag shape by heat-welding resin sheets to each other, and as a resin sheet constituting the bag body, a resin sheet having a lower heat-weldability on the outer surface than the inner surface. The packaging bag that is used.

(C) A packaging bag including a bag body formed in a bag shape by a resin sheet and a columnar reinforcing member for reinforcing the side edge portion of the bag body, and the reinforcing member is a side edge of the bag body. The first wall portion that covers one side of the portion, the second wall portion that covers the other surface side, the first wall portion and the second wall portion are connected, and the edge of the side edge portion of the bag body is covered. A third wall portion is provided, and an insertion portion including at least one of a through hole and a notch having a narrow portion on the edge side is provided on the side edge portion of the bag body, and the first wall portion of the reinforcing member is provided with an insertion portion. Is a packaging bag characterized in that a regulation pillar to be inserted into the insertion portion is provided.

(2) A packaging bag including a bag body formed in a bag shape by a resin sheet and a columnar reinforcing member for reinforcing the side edge portion of the bag body, and the reinforcing member is a side edge of the bag body. The first wall portion that covers one side of the portion, the second wall portion that covers the other surface side, the first wall portion and the second wall portion are connected, and the edge of the side edge portion of the bag body is covered. A third wall portion is provided, and an insertion portion including at least one of a through hole and a notch having a narrow portion on the edge side is provided on the side edge portion of the bag body, and the first wall portion of the reinforcing member is provided with an insertion portion. Is characterized in that a regulation pillar to be inserted through the insertion portion is provided, and the base end of the regulation pillar is connected to the first wall portion and the tip thereof is not connected to the second wall portion. Packaging bag.

10 ... bag body, 11 ... bottom sheet, 12 ... side sheet, 13 ... side edge welded part, 14 ... lower edge welded part, 15 ... first insertion part, 16 ... second insertion part, 16a ... narrow part, 20 ... Reinforcing member, 21 ... 1st wall part, 22 ... 2nd wall part, 23 ... 3rd wall part, 24 ... 1st regulation pillar, 25 ... 2nd regulation pillar.

Claims (1)

A packaging bag including a bag body formed in a bag shape by a resin sheet and a columnar reinforcing member for reinforcing the side edge portion of the bag body.
The reinforcing member connects the first wall portion that covers one side of the side edge portion of the bag body, the second wall portion that covers the other surface side, the first wall portion, and the second wall portion. A third wall portion that covers the edge of the side edge portion of the bag body is provided.
The side edge portion of the bag body is provided with an insertion portion consisting of at least one of a through hole and a notch having a narrow portion on the edge side.
A packaging bag (excluding a reinforcing member that can be folded back via a hinge), wherein the first wall portion of the reinforcing member is provided with a regulating column that is inserted through the insertion portion.