JP6538900B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag provided with a reinforcing member.

  DESCRIPTION OF RELATED ART Conventionally, the packaging bag which reinforced the bag main body which consists of a resin sheet with a reinforcement member is known for the purpose of prevention of a mid-break of a packaging bag, a self-support improvement, etc. FIG. 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, in a state in which the side edge portion of the bag body is inserted into the cavity for forming the reinforcing member, the thermoplastic resin is injected into the cavity. As a result, a columnar reinforcing member having a U-shaped cross section is formed at the side edge of the bag body.

Japanese Patent Application Laid-Open No. 2003-191964

  By the way, in the above packaging bag, the reinforcing member is in a state where it is simply fitted to the side edge of the bag body. Therefore, when a pulling force is applied to the reinforcing member from the side edge to the outer side (left and right direction), the reinforcing member may be detached from the side edge.

  This invention is made in view of such a situation, The objective is to provide the packaging bag which can suppress that a reinforcement member remove | deviates from the side edge part of a bag main body.

  In order to achieve the above object, the packaging bag according to claim 1 comprises a bag body formed in a bag shape with a resin sheet, and a columnar reinforcing member for reinforcing the side edge of the bag body. The reinforcing member includes a first wall covering one surface of the side edge of the bag body, a second wall covering the other surface, and the first and second walls. And a third wall covering the edge of the side edge of the bag body, the side edge of the bag body being a through hole and at least one of 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 restricting post to be inserted into the insertion portion. However, it excludes the reinforcement member which can be folded back through the hinge.

  According to the above configuration, when a force of pulling outward from the side edge of the bag main body acts on the reinforcing member, the restriction post is caught on the periphery of the insertion portion in the side edge. Thereby, the relative movement of the reinforcing member with respect to the side edge is restricted, and the detachment of the reinforcing member from the side edge is suppressed.

  In the packaging bag, it is preferable that a base end of the restriction pillar is connected to the first wall portion and a tip end is not connected to the second wall portion.

  According to the packaging bag of this invention, it can suppress that a reinforcement member remove | deviates from the side edge part of a bag main body.

(A) is a front view of a packaging bag, (b) is an exploded view of a packaging bag. (A) is the elements on larger scale of FIG. 1, (b) is 2-2 sectional drawing. (A) is the elements on larger scale of FIG. 1, (b) is line 3-3 sectional drawing. (A), (b) is a figure which shows the insertion part of a modification. (A), (b) is a figure which shows the control pillar of a modification.

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

  As shown in FIG. 1 (b), the bag body 10 is disposed opposite to the horizontally long substantially rectangular bottom sheet 11 folded in half with the fold line facing upward and sandwiching the bottom sheet 11. It is comprised from a pair of longitudinally long rectangular-shaped side sheet 12. As shown in FIG. Then, in a state in which the pair of side sheets 12 is 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 respectively adhered and have an opening at the upper side. It is formed in the shape of a bag.

  As the bottom sheet 11 and the side sheet 12, a sheet material having a multilayer structure in which a seal layer is formed on the inner surface side and a non-seal layer is formed on the outer surface side is used. The seal layer is a layer formed of a heat-welding resin material (for example, polyethylene, unstretched polypropylene, ethylene-vinyl acetate copolymer). Further, the non-seal layer is made of a material (for example, paper) not having heat weldability, or a resin material (for example, stretched polypropylene, polyester, polyamide, or the like) which is less heat weldable than the resin material forming the seal layer. It is a layer formed of polyvinyl chloride, cellophane, polystyrene). The form of the non-sealed layer may be a sheet (film) or 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 edges. The side edge welds 13 are respectively formed by heat welding with a width. These side edge welds 13 constitute the side edges of the bag body 10.

  Further, at 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 an arc-shaped recessed curve 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 above-described area. In addition, said "outer surface of the bottom sheet 11" means the outer surface in the state folded in half.

  As shown to Fig.1 (a), the reinforcement member 20 formed with a resin material is attached to the both-sides edge welding part 13 of the bag main body 10, respectively. The reinforcing member 20 is formed in a columnar shape extending along the side edge welded portion 13 of the bag body 10, and is formed in a U-shape (groove shape) in cross section covering the edge of the side edge welded portion 13 from the outside. . Specifically, as shown in FIG. 2 (b) and FIG. 3 (b), the reinforcing member 20 has a first wall portion 21 covering one surface side of the side edge welded portion 13 and the other side edge welded portion 13. The second wall 22 covering the surface side and the third wall 23 covering the edge of the side edge weld 13 are formed in a U-shaped cross section.

  As shown in FIGS. 1 (a) and 2 (a), the side edge welded portion 13 has a circular shape passing through the side edge welded portion 13 in the thickness direction in the portion covered by the upper end of the reinforcing member 20. A hole-shaped first insertion portion 15 is provided. In the reinforcing member 20, the first restricting post 24 provided between the first wall 21 and the second wall is inserted into the first insertion portion 15. As shown in FIG. 2 (b), one end of the first restricting post 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 21 and the second wall 22.

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

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

  The first restricting post 24 and the second restricting post 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 welded portion 13 thereof. Then, with the side edge welded portion 13 of the bag body 10 inserted into the cavity for injection-forming the reinforcing member 20, the resin material is injected into the cavity. As a result, the first restricting post 24 and the second restricting post 25 are integrally formed together with the wall portions constituting the reinforcing member 20.

Next, the operation of the present embodiment will be described.
In the packaging bag of the present embodiment, the first restricting pillar 24 and the second restricting 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. The first insertion portion 15 and the second insertion portion 16 formed in the portion 13 are inserted. Therefore, when a force of pulling the reinforcing member 20 from the side edge welded portion 13 of the bag body 10 to the outer side (left and right direction) acts, the first restricting pillar 24 and the second restricting pillar 25 The edges of the first insertion portion 15 and the second insertion portion 16 in the edge welding portion 13 are caught. Thereby, positional deviation (relative movement) of the reinforcing member 20 with respect to the side edge welded portion 13 is restricted, and the reinforcing member 20 is prevented from being detached from the side edge welded portion 13.

Next, the effects of the present embodiment will be described.
(1) The packaging bag is provided with a bag main body 10 formed in a bag shape with a resin sheet, and a columnar reinforcing member 20 for reinforcing the side edge welded portion 13 of the bag main body 10. The reinforcing member 20 has a first wall 21 covering one surface of the side edge welded portion 13 of the bag body 10, a second wall 22 covering the other surface, a first wall 21 and a second wall 22. And a third wall 23 that covers the edge of the side edge weld 13 and connects the The first insertion portion 15 and the second insertion portion 16 are provided in the side edge welded portion 13 of the bag body 10, and the first insertion portion 15 and the second insertion portion 16 are provided in the first wall portion 21 of the reinforcing member 20. The 1st control pillar 24 and the 2nd control pillar 25 which are inserted in are provided.

According to the above configuration, the positional deviation of the reinforcing member 20 with respect to the side edge welded portion 13 is restricted, and the detachment of the reinforcing member 20 from the side edge welded portion 13 is suppressed.
(2) The first control column 24 and the second control column 25 are connected at their proximal ends to the first wall portion 21 and at their distal ends to the second wall portion 22.

  According to the above configuration, by connecting both ends to the first wall portion 21 and the second wall portion 22, the strength of the first restricting pillar 24 and the second restricting pillar 25 is enhanced. When the positional deviation of the reinforcing member 20 with respect to the side edge welded portion 13 is restricted, the load is concentrated on the first restricting pillar 24 and the second restricting pillar 25. As described above, by increasing the strength of the first restricting pillar 24 and the second restricting pillar 25, it is possible to suppress the occurrence of breakage, bending or the like in the first restricting pillar 24 and the second restricting pillar 25.

(3) The first insertion portion 15 and the second insertion portion 16 are formed as through holes penetrating the side edge welded portion 13 of the bag body 10.
According to the above configuration, it is possible to regulate the positional deviation of the reinforcing member 20 in any direction by 360 degrees in the direction along the surface of the side sheet 12. Therefore, the reinforcing member 20 can be easily held properly attached to the side edge welded portion 13 of the bag body 10.

(4) The first insertion portion 15 and the second insertion portion 16 are provided at the end of the reinforcing member 20.
When the reinforcing member 20 is detached from the side edge welded portion 13, first, the end of the reinforcing member 20 tends to detach and the central portion of the reinforcing member 20 gradually detaches from the end. Therefore, by providing the first insertion portion 15 and the second insertion portion 16 at the end portion and restricting 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 welded portion 13 Can be suppressed.

  (5) The bag body 10 is formed into a bag shape by bonding the bottom sheet 11 folded in half so that the folds face upward and the pair of side sheets 12 disposed so as to sandwich the bottom sheet 11. It is formed. Then, the side edge welded portion 13 is formed as a welded portion formed by welding the side sheet 12 together 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 welded portion 13 where the side sheet 12 and the bottom sheet 11 are welded.

  When the bottom sheet 11 is developed, a force that is pulled inward acts on the side edge welded portion 13 at the portion where the side sheet 12 and the bottom sheet 11 are welded. In addition, since the bottom sheet 11 is sandwiched in a half-folded state, the above-described portion is combined with the two side sheets 12 and is in a state in which four sheets are stacked, and is thicker than the other portions. It is a part. From this point of view, the above-mentioned portion tends to be easily detached 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-described portion and restricting the positional deviation of the reinforcing member 20 at the same portion, it is possible to more effectively suppress the reinforcing member 20 from being detached from the side edge welded 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 a resin material having a poor heat-welding property is formed on the outer surface side The resin sheet of the multilayer structure in which the non-sealed layer was formed is used.

  In this case, when the reinforcing member 20 is formed by injection molding, the side edge welded portion 13 of the bag body 10 is not welded to the reinforcing member 20 or is in a weakly welded state even if welded. Therefore, the reinforcing member 20 is easily detached from the side edge welded portion 13. When the configurations of the first insertion portion 15 and the second insertion portion 16 as well as the first restricting post 24 and the second restricting post 25 described above are applied to a configuration in which the reinforcing member 20 is easily detached from the side edge welded portion 13 Particularly effective.

  In addition, it is also possible to change and implement this embodiment as follows. Moreover, it is also possible to combine the following modifications with each other and to change the above embodiment as a combination configuration. Hereinafter, the first insertion portion 15 and the second insertion portion 16 will be collectively referred to as an insertion portion, and the first restricting post 24 and the second restricting post 25 will be collectively referred to as a restricting post.

  -In the above-mentioned embodiment, while having provided two penetration parts to side edge welding part 13 of one side, and having provided two control pillars to reinforcement member 20 of one side, 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 welded portion 13, the effect of the above (1) can be sufficiently obtained even if only one insertion portion and one restriction column are provided. . Further, the formation positions of the insertion portion and the restriction column are not limited to the positions corresponding to the both ends of the restriction column, and can be appropriately changed.

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

-As shown in FIG. 4, a penetration part may be a notch which has a narrow part in the edge 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 inward from the left and right edges of the side edge welded portion 13 as the second insertion portion 16. This notch is inclined at the base end by inclining the upper edge downward from the distal side to the proximal side (edge side) and by inclining the lower edge upward from the distal side to the proximal side (edge side) A narrow portion 16a is provided on the side (edge side).

  In the example shown in FIG. 4B, similarly, the second insertion portion 16 is provided with a laterally-oriented T-shaped notch inwardly from the left and right edges of the side edge welded portion 13. This notch is provided with a narrow portion 16a on its proximal side (edge side) by partially denting the proximal side (edge side) of the upper edge and the lower edge.

  Even when the insertion portion is a notch having the narrow portion 16a on the edge side, when the pulling force acts on the reinforcing member 20 outward from the side edge welded portion 13 of the bag body 10, the insertion portion The restriction column inserted in the above is caught on the periphery of the insertion portion (in particular, the narrow portion 16a). Therefore, similarly to the above embodiment, the positional deviation of the reinforcing member 20 with respect to the side edge welded portion 13 is restricted, and it is possible to suppress the detachment of the reinforcing member 20 from the side edge welded portion 13. Moreover, the first insertion portion 15 may be a through hole, and the second insertion portion 16 may be a notch, and the insertion portion including the through hole may be combined with the insertion portion including the notch.

As shown in FIG. 5, the end of the restricting post may not be connected to the second wall 22. Here, the example which changed the 1st control pillar 24 is demonstrated.
In the example shown to Fig.5 (a), the 1st wall part 21 is made to extend inside the 2nd wall part 22, and the 1st control pillar 24 is provided in the part made to extend. And the tip of the 1st control pillar 24 is in the state where the side edge welding part 13 was made to project. Even when configured in this way, the effect of the above (1) can be obtained. In the example shown in FIG.5 (b), the return part 24a is provided in the front-end | tip of the 1st control pillar 24 protruded from the side edge welding part 13 in the example shown to Fig.5 (a). In this case, it is possible to suppress the removal of the first restriction pillar 24 from the insertion portion (first insertion portion 15) of the side edge welded 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. However, the reinforcing member is partially reinforced with respect to the side edge welding portion 13. 20 may be attached. Further, a plurality of reinforcing members 20 divided up and down may be attached to one side edge welded portion 13.

  A mouthpiece may be attached to the upper part of the bag body 10. For example, in the upper portion 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 sheet 12 are heat-welded with a constant width to provide an upper edge welded portion Do.

  -In the said embodiment, although the side edge weld part 13 and the lower edge weld part 14 of the bag main body 10 were adhere | attached by heat-welding the side sheet 12 comrades or the side sheet 12 and the bottom sheet 11, The bonding method is not particularly limited. For example, each sheet may be adhered using an adhesive or the like.

  -As a resin sheet (bottom sheet 11 and side sheet 12) which constitutes bag main part 10, you may use a resin sheet in which a seal layer was formed in both sides. Moreover, when it is set as the structure which adhere | attached each sheet using an adhesive agent etc., the resin sheet in which the non-seal layer was formed in both surfaces can also be used.

-The resin material which forms the reinforcement member 20 is not specifically limited, The well-known resin material conventionally used as a reinforcement member of a packaging bag can be used.
However, among 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 molding the reinforcing member 20, the resin sheet constituting the bag main body 10 It is particularly preferable to use a resin material which is not welded or is weakly welded even when welded. In this case, the direct bonding force between the side sheet 12 and the reinforcing member 20 is reduced. Therefore, the reinforcing member 20 is removed from the side edge welded portion 13 by the effect of the above (1), that is, the configuration of the first insertion portion 15 and the second insertion portion 16 and the first restriction post 24 and the second restriction post 25. The suppressing effect is more remarkable.

  In addition, when the layer formed in the outer surface side of a resin sheet is raw materials other than resin, such as paper, regardless of the kind of resin material which forms the reinforcement member 20, it corresponds to said example. Moreover, when the layer formed in the outer surface side of a resin sheet is a resin material, when the reinforcement member 20 is formed with the resin material different from the resin material, it corresponds to said example. Specifically, when the layer formed on the outer surface side of the resin sheet is formed 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 resin materials having low affinity to the same layer include polypropylene, polyethylene, polyvinyl chloride, polyester, polystyrene, acrylonitrile butadiene styrene, polyamide, polyacetal, polycarbonate, polybutylene terephthalate, and polyphenylene sulfide. It can be mentioned.

Next, technical ideas that can be grasped from the above-described embodiment and modifications will be described.
(A) The packaging bag in which the reinforcing member is integrally formed by injection molding with respect to the side edge portion of the bag main body.

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

  (C) A packaging bag comprising a bag body formed in a bag shape with a resin sheet, and a columnar reinforcing member for reinforcing the side edge of the bag body, wherein the reinforcing member is the side edge of the bag body The first wall covering one surface side of the part, the second wall covering the other surface side, the first wall and the second wall are connected, and the edge of the side edge of the bag main body is covered A through-hole including at least one of a through-hole and a notch having a narrow portion on the edge side is provided at the side edge portion of the bag body, having a third wall portion, and the first wall portion of the reinforcing member is provided A packaging bag characterized in that a restriction pillar inserted into the insertion portion is provided.

  DESCRIPTION OF SYMBOLS 10 ... Bag body, 11 ... Bottom sheet, 12 ... Side sheet, 13 ... Side edge welding part, 14 ... Lower edge welding part, 15 ... 1st penetration part, 16 ... 2nd penetration part, 16a ... Width narrow part, 20 ... Reinforcement member, 21 ... 1st wall, 22 ... 2nd wall, 23 ... 3rd wall, 24 ... 1st control post, 25 ... 2nd control post.

Claims (1)

A packaging bag comprising: a bag main body formed in a bag shape with a resin sheet; and a columnar reinforcing member for reinforcing the side edge of the bag main body,
The reinforcing member connects a first wall covering one surface of the side edge of the bag body, a second wall covering the other surface, the first wall, and the second wall. And a third wall covering an edge of the side edge of the bag body,
The side edge portion of the bag body is provided with an insertion portion comprising at least one of a through hole and a notch having a narrow portion on the edge side,
The first wall portion of the reinforcing member is provided with a restricting post to be inserted into the insertion portion ,
The packaging bag is characterized in that a base end of the restriction pillar is connected to the first wall and a tip end is not connected to the second wall .