JP2018104098A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag capable of suppressing a reinforcing member from coming out of a side edge part of a bag body.SOLUTION: A packaging bag comprises a bag body formed of a resin sheet in a bag shape and a columnar reinforcing member 20 reinforcing a side edge weld part 13 of the bag body. The reinforcing member 20 comprises a first wall part 21 covering one surface side of the side edge weld part 13 of the bag body, a second wall part 22 covering the other surface side thereof, and a third wall part 23 connecting the first wall part 21 and second wall part 22 together and also covering an edge of the side edge weld part 13. The side edge weld part 13 of the bag body is provided with a first insertion part 15, and the first wall part 21 of the reinforcing member 20 is provided with a first regulation column 24 inserted into the first insertion part 15.SELECTED DRAWING: Figure 2

Description

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

  2. Description of the Related Art 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 folding of the packaging bag and improving self-supporting property. For example, Patent Document 1 discloses a packaging bag in which a side edge portion of a 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, a thermoplastic resin is injected into the cavity with the side edge of the bag body inserted into the cavity for forming the reinforcing member. Thereby, a columnar reinforcing member having a U-shaped cross section is formed on the side edge of the bag body.

JP 2003-191964 A

  By the way, in the said packaging bag, the reinforcement member is made into the state which was simply fitted by the side edge part of the bag main body. Therefore, when the force pulling outward from the side edge portion (left-right direction) acts on the reinforcing member, the reinforcing member may come off from the side edge portion.

  This invention is made | formed 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, a packaging bag according to claim 1 is provided with a bag body formed in a bag shape from a resin sheet, and a columnar reinforcing member that reinforces a side edge of the bag body. The reinforcing member includes a first wall portion covering one surface side of the side edge portion of the bag body, a second wall portion covering the other surface side, the first wall portion and the second wall portion. And 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 through at least one of a through hole and a notch having a narrow portion on the edge side. And a restricting column that is inserted through the insertion portion is provided in the first wall portion of the reinforcing member. However, a reinforcing member that can be folded back via a hinge is excluded.

  According to the said structure, when the force pulled to the outward side from the side edge part of a bag main body acts on a reinforcement member, a control pillar is hooked on the periphery of the insertion part in a side edge part. Thereby, the relative movement of the reinforcing member with respect to the side edge is restricted, and the reinforcing member is prevented from being detached from the side edge.

  In the packaging bag, it is preferable that a base end of the restriction column is connected to the first wall portion and a tip end thereof 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 3-3 sectional drawing. (A), (b) is a figure which shows the insertion part of the example of a change. (A), (b) is a figure which shows the control pillar of the example of a change.

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 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 body 10 is disposed so as to face the bottom sheet 11 having a horizontally long and substantially rectangular shape that is folded in two so that the crease faces upward. It comprises a pair of vertically long rectangular side sheets 12. And as the state which piled up the bottom sheet | seat 11 folded in half and the pair of side sheet | seat 12 was piled up, each edge part of the left and right both sides and lower side of the side sheet | seat 12 was each adhere | attached, and it has an opening above It is formed in a bag shape.

  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 from a heat-weldable resin material (for example, polyethylene, unstretched polypropylene, ethylene-vinyl acetate copolymer). The non-seal layer is made of a material that does not have heat-weldability (for example, paper) or a resin material that has lower heat-weldability than the resin material that forms the seal layer (for example, stretched polypropylene, polyester, polyamide, Polyvinyl chloride, cellophane, polystyrene). 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 sheets 12 and the inner surfaces of the side sheets 12 and the outer surface of the bottom sheet 11 are substantially constant along both side edges. The side edge welded portions 13 are formed by heat welding with the width. These side edge welded portions 13 constitute side edge portions of the bag body 10.

  In addition, 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 a curved line that is recessed in an arc shape in the vertical direction and the left, right, and lower edges 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 folded state.

  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, respectively. The reinforcing member 20 is formed in a column shape extending along the side edge welded portion 13 of the bag body 10 and is formed in a U-shaped cross section (groove shape) that covers the edge of the side edge welded portion 13 from the outside. . Specifically, as shown in FIG. 2B and FIG. 3B, the reinforcing member 20 includes a first wall portion 21 that covers one side of the side edge welded portion 13, and other side edge welded portions 13. The second wall portion 22 covering the surface side and the third wall portion 23 covering the edge of the side edge welded portion 13 are formed in a U-shaped cross section.

  As shown in FIGS. 1 (a) and 2 (a), in the side edge welded portion 13, the portion covered by the upper end portion of the reinforcing member 20 has a circular shape that penetrates the side edge welded portion 13 in the thickness direction. A hole-shaped first insertion portion 15 is provided. In the reinforcing member 20, a first restriction column 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. 2 (b), the first regulating column 24 has one end connected to the inner surface of the first wall portion 21 and the other end connected to the inner surface of the second wall portion 22. The wall portion 21 and the second wall portion 22 are formed integrally.

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

  As shown in FIG. 3B, the second insertion column 16 is inserted with a second restriction column 25 provided between the first wall portion 21 and the second wall portion in the reinforcing member 20. The second regulating column 25 has one end connected to the inner surface of the first wall portion 21 and the other end connected to the inner surface of the second wall portion 22, and the first wall portion 21 and the second wall portion 22 It is integrally formed.

  In addition, the 1st control pillar 24 and the 2nd control pillar 25 can be formed as follows, for example. 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 weld portion 13. And the resin material is inject | poured in a cavity in the state which inserted the side edge welding part 13 of the bag main body 10 in the cavity for injection-molding the reinforcement member 20. FIG. Thereby, the 1st control pillar 24 and the 2nd control pillar 25 are integrally formed with each wall part which comprises the reinforcement member 20. As shown in FIG.

Next, the operation of this embodiment will be described.
In the packaging bag of the present embodiment, the first regulation column 24 and the second regulation column 25 provided integrally with 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 part 15 and the second insertion part 16 formed in the part 13 are inserted. Therefore, when the pulling force is applied to the reinforcing member 20 from the side edge welded portion 13 of the bag body 10 to the outer side (left and right direction), the first regulating column 24 and the second regulating column 25 are It is caught on the peripheral edge of the first insertion part 15 and the second insertion part 16 in the edge welding part 13. Thereby, the position shift (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 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 that reinforces the side edge welded 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 welded 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. And a third wall portion 23 that covers the edge of the side edge welded portion 13. The side edge welded portion 13 of the bag body 10 is provided with a first insertion portion 15 and a second insertion portion 16, and the first wall portion 21 of the reinforcing member 20 has a first insertion portion 15 and a second insertion portion 16. The 1st control pillar 24 and the 2nd control pillar 25 which are penetrated by are provided.

According to the above configuration, the displacement 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.
(2) The first restriction pillar 24 and the second restriction pillar 25 have base ends connected to the first wall portion 21 and distal ends connected to the second wall portion 22.

  According to the above configuration, the strength of the first restriction column 24 and the second restriction column 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 welded portion 13 is restricted, the load is concentrated on the first restriction column 24 and the second restriction column 25. As described above, by increasing the strength of the first restriction pillar 24 and the second restriction pillar 25, it is possible to suppress the first restriction pillar 24 and the second restriction pillar 25 from being bent or bent.

(3) The first insertion portion 15 and the second insertion portion 16 are formed as through holes that penetrate the side edge welded portion 13 of the bag body 10.
According to the above configuration, the displacement of the reinforcing member 20 in any direction can be regulated 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 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 portion of the reinforcing member 20 is removed, and the central portion of the reinforcing member 20 tends to be gradually removed from the end portion. Therefore, it is more effective that the reinforcing member 20 is detached from the side edge welded portion 13 by providing the first inserting portion 15 and the second inserting portion 16 at the end portion and restricting the positional shift at the end portion of the reinforcing member 20. Can be suppressed.

  (5) The bag body 10 is formed into a bag shape by adhering a bottom sheet 11 folded in half so that the crease faces upward and a pair of side sheets 12 arranged so as to sandwich the bottom sheet 11. Is formed. And the side edge welding part 13 is formed along the side edge of the side sheet 12 as a welding part formed by welding the side sheets 12 and the side sheet 12 and the bottom sheet 11. A second insertion portion 16 is provided at a portion of the side edge weld portion 13 where the side sheet 12 and the bottom sheet 11 are welded.

  In the side edge welded portion 13, a force that is pulled inward when the bottom sheet 11 is deployed acts on a portion where the side sheet 12 and the bottom sheet 11 are welded. In addition, since the bottom sheet 11 is sandwiched in a folded state, the above part is in a state where four sheets are stacked together with the two side sheets 12, and is thicker than the other parts. It is a part. From such a point, compared with the other site | part in the side edge weld part 13, the said site | part tends to remove | deviate from the reinforcement member 20 (it is easy to remove | deviate). Therefore, by providing the 2nd penetration part 16 in the above-mentioned part, and controlling position shift of reinforcement member 20 in the part, it can control more effectively that reinforcement member 20 removes from side edge welding part 13.

  (6) As the bottom sheet 11 and the side sheet 12 constituting the bag body 10, a seal layer made of a heat-weldable resin material is formed on the inner surface side, and made of a resin material having a poor heat-weldability on the outer surface side. A resin sheet having a multilayer structure in which a non-sealing layer is 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 weakly welded even if it is welded. Therefore, the reinforcing member 20 is easily detached from the side edge welded portion 13. When the configuration of the first insertion portion 15 and the second insertion portion 16 and the first restriction column 24 and the second restriction column 25 described above is applied to a configuration in which the reinforcing member 20 is easily detached from the side edge welded portion 13, It is particularly effective.

  In addition, this embodiment can also be changed and embodied as follows. Further, the following modification examples can be combined with each other, and the above-described embodiment can be changed like a combination configuration. Hereinafter, the first insertion portion 15 and the second insertion portion 16 are collectively referred to as an insertion portion, and the first restriction column 24 and the second restriction column 25 are collectively referred to as a restriction column.

  In the above embodiment, two insertion portions are provided for the side edge welded portion 13 on one side and two restriction pillars are provided for the reinforcing member 20 on 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 in a configuration in which only one insertion portion and a restriction column are provided. . Further, the formation positions of the insertion portion and the restriction column are not limited to the positions corresponding to both ends of the restriction column, and can be changed as appropriate.

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

-As shown in FIG. 4, the notch which has a narrow part on the edge side may be sufficient as an insertion part. 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 cutout is provided as the second insertion portion 16 from the left and right edges of the side edge welded portion 13 toward the inside. The notch is formed by inclining the upper edge downward from the distal end side toward the proximal end side (edge side) and by inclining the lower edge upward from the distal end side toward the proximal end side (edge side). 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 laterally T-shaped notch is provided from the left and right edges of the side edge welded portion 13 toward the inside. This notch is provided with a narrow portion 16a on the base end side (edge side) by partially denting the base end sides (edge sides) of the upper and lower edges.

  Even when the insertion portion is a notch having a narrow portion 16a on the edge side, the insertion portion is applied when a force pulling outward from the side edge welded portion 13 of the bag body 10 acts on the reinforcing member 20. The restricting column inserted through is caught on the periphery (particularly the narrow portion 16a) of the insertion portion. Therefore, similarly to the said embodiment, the position shift of the reinforcement member 20 with respect to the side edge welding part 13 is controlled, and it can suppress that the reinforcement member 20 remove | deviates from the side edge welding part 13. FIG. Further, the insertion part made of the through hole and the insertion part made of the notch may be combined so that the first insertion part 15 is a through hole and the second insertion part 16 is a notch.

As shown in FIG. 5, the restriction column may be configured such that the end portion thereof is not connected to the second wall portion 22. Here, the example which changed the 1st control pillar 24 is demonstrated.
In the example shown in FIG. 5A, the first wall 21 is extended inward from the second wall 22, and the first restriction column 24 is provided in the extended portion. And the front-end | tip of the 1st control pillar 24 is in the state which made the side edge weld part 13 protrude. Even in such a configuration, the effect (1) can be obtained. In the example shown in FIG. 5B, a return portion 24a is provided at the tip of the first regulating column 24 protruding from the side edge welded portion 13 in the example shown in FIG. In this case, the first restriction column 24 can be prevented from coming off from the insertion portion (first insertion portion 15) of the side edge weld portion 13.

  In the above embodiment, the reinforcing member 20 is attached to substantially the entire side edge welded portion 13 along the edge of the side edge welded portion 13. 20 may be attached. In addition, a plurality of reinforcing members 20 divided in the vertical direction may be attached to one side edge welded portion 13.

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

  In the above embodiment, the side edge welded portion 13 and the lower edge welded portion 14 of the bag body 10 are bonded by thermally welding the side sheets 12 or the side sheets 12 and the bottom sheet 11, The bonding method is not particularly limited. For example, the structure which adhered each sheet | seat using the adhesive agent etc. may be sufficient.

  -As a resin sheet (the bottom sheet 11 and the side sheet 12) which comprises the bag main body 10, you may use the resin sheet in which the sealing layer was formed in both surfaces. Moreover, when it is set as the structure which bonded each sheet | seat using the 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 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 the resin sheet constituting the bag body 10 is formed when the reinforcing member 20 is molded. It is particularly preferable to use a resin material that is not welded or is weakly welded. In this case, the direct coupling force between the side sheet 12 and the reinforcing member 20 becomes small. Therefore, the effect of the above (1), that is, that the reinforcing member 20 is detached from the side edge welded portion 13 due to the configuration of the first insertion portion 15 and the second insertion portion 16 and the first restriction column 24 and the second restriction column 25. The suppression effect becomes more remarkable.

  In addition, when the layer formed in the outer surface side of a resin sheet is materials other than resin, such as paper, it corresponds to said example irrespective of the kind of resin material which forms the reinforcement member 20. FIG. Moreover, when the layer formed in the outer surface side of a resin sheet is a resin material, it corresponds to said example when the reinforcement member 20 is formed with the resin material different from the resin material. 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, or polystyrene, the resin material that forms the reinforcing member 20 Examples of the resin material having 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 embodiment and the modified examples will be described.
(A) The packaging bag, wherein the reinforcing member is integrally formed by injection molding with respect to a side edge portion of the bag body.

  (B) The bag body is formed into a bag shape by heat-sealing resin sheets, and the resin sheet constituting the bag body has a lower heat-weldability on the outer surface than the inner surface. That the packaging bag is used.

  (C) A packaging bag comprising a bag body formed of a resin sheet in a bag shape and a columnar reinforcing member that reinforces a side edge of the bag body, wherein the reinforcing member is a side edge of the bag body A first wall that covers one side of the bag, a second wall that covers the other side, and connects the first wall and the second wall and covers the edge of the side edge of the bag body. A side wall of the bag body is provided with an insertion portion including at least one of a through hole and a notch having a narrow portion on the edge side, and the first wall portion of the reinforcing member is provided with a third wall portion. Is provided with a regulation pillar inserted through the insertion portion.

  DESCRIPTION OF SYMBOLS 10 ... Bag main body, 11 ... Bottom sheet, 12 ... Side sheet, 13 ... Side edge welding part, 14 ... Lower edge welding part, 15 ... 1st insertion part, 16 ... 2nd insertion part, 16a ... Narrow part, 20 ... reinforcing member, 21 ... first wall part, 22 ... second wall part, 23 ... third wall part, 24 ... first restriction pillar, 25 ... second restriction pillar.

Claims (2)

A packaging bag comprising a bag body formed in a bag shape by a resin sheet, and a columnar reinforcing member that reinforces a side edge of the bag body,
The reinforcing member connects the first wall portion that covers one surface 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 covering the 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,
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 restriction column that is inserted into the insertion portion.   2. The packaging bag according to claim 1, wherein a base end of the restriction column is connected to the first wall portion, and a distal end is not connected to the second wall portion.