JP2009248986A - Gusset bag - Google Patents

Abstract

The present invention provides a gusset bag capable of improving the self-supporting property, ensuring a wide opening width at the lower end, and easily filling the contents from the lower end.
In a bag body portion having a pair of front and rear plane portions 2 and a pair of gusset side portions 3 folded inward of a bag, an upper end portion 4 is closed and a lower end portion 5 is opened, and at least the bag A folding auxiliary portion 6 is formed by joining the position in the vicinity of the side edge 2a on either the front side or the rear side of the gusset and the inner surfaces of the gusset side surface portion 3 that overlap with the position, and the folding line 3a of the gusset side surface portion and the plane portion 2 Angle formed by a line segment B extending upward from the intersection X1 with the lower end joint portion 5a for closing the lower end portion toward the side edge 2a of the corresponding flat portion and a line segment A coinciding with the upper end of the lower end joint portion 5a Is within the range of 35 to 55 °, and the bending assisting portion 6 includes an intersection X2 between the line segment B extending upward and the side edge 2a of the side surface portion of the gusset, and is disposed at a position where the lower end joint portion 5a is not touched. Gazette characterized by being 101.
[Selection] Figure 2

Description

  The present invention relates to a gusset bag having stable independence when the contents are filled.

Conventionally, as a packaging bag having no flat bottom portion, a pair of gusset side surfaces provided with a pair of opposed flat portions constituting the front side and the rear side of the bag and a folding line folded inwardly into the bag in a fold-like shape There is known a gusset bag in which the gusset side surface portion extends to the lower end portion of the bag and the lower end portion is sealed. When selling products using the gusset bag at the store, the lower end of the gusset bag is folded to one side slightly above the lower end of the gusset bag to form a flat bottom using the weight of the contents, We display products.
However, the bottom end of the gusset bag has no part that triggers folding to form the bottom, so the folding position is not fixed, and a flat bottom is formed even if the bottom end of the gusset bag is folded to one side. There is a problem that it is difficult to do. In particular, when a light weight content is filled, the bottom of the gusset bag is difficult to stabilize.

  Patent Document 1 has a pair of opposed plane portions and a pair of side portions formed in a fold shape and folded inward so that the fold lines thereof correspond to each other. The cylindrical body is formed by thermally fusing the inner surfaces of the four ridge lines formed by the side portions, and the upper edge and the lower edge of the cylinder are further thermally fused, and the lower edge is thermally fused. In order to connect the ridgeline and the heat-sealed ridgeline, the inner surfaces of the flat surface portion and the side surface portion are heat-sealed to form a triangular seal portion, in the triangular heat seal portion, There is disclosed a gusset bag in which a folding assisting portion is formed on at least one of the flat surface portion or the side surface portion. The bottom of the gusset bag is formed with a fold extending to the left and right of the folding assisting portion, and a flat bottom is formed by folding the lower end of the gusset bag in one direction along the fold. . Thereby, the said gusset bag has ensured high independence.

JP 2004-196414 A

Depending on the type of filling machine for filling the contents, there are cases where filling is performed from the upper end of the gusset bag and filling is performed from the lower end of the gusset bag.
When using a filling machine that fills the contents from the upper end of the gusset bag, the content is obtained by filling the opening from the upper end of the gusset bag using a gusset bag with the lower end closed and the upper end open. Objects can be filled easily. Also, when using a filling machine that fills the contents from the lower end of the gusset bag, by using a gusset bag with the upper end closed and the lower end opened, by filling from the opening at the lower end of the gusset bag The contents can be filled easily.
In the gusset bag described in the cited document 1, for the purpose of improving the self-supporting property of the gusset bag, a triangular heat seal portion is formed outside the storage portion in which the contents are stored, and the lower end of the gusset bag. A part of the part is heat-sealed. Therefore, when filling the contents from the upper end of the gusset bag, the contents can be easily filled by opening the upper end of the gusset bag and ensuring a wide opening width for filling the contents. it can. However, when filling the contents from the lower end portion of the gusset bag, since the lower end portion of the gusset bag is partially heat-sealed, it is possible to ensure a wide opening width for filling the contents. It is not possible to fill the contents.

  In view of the above circumstances, the present invention can improve the self-supporting property of the gusset bag, and ensures a wide opening width at the lower end portion of the gusset bag even when the contents are filled from the lower end portion of the gusset bag. An object of the present invention is to provide a gusset bag that can be easily filled with contents.

As a result of intensive studies, the present inventors have formed the above-mentioned problem by forming a folding auxiliary portion that easily forms a flat surface by folding the lower end portion of the gusset bag at a specific position near the side edge of the gusset bag. The inventor has found out that the problem can be solved and has completed the present invention.
That is, the gusset bag according to the present invention includes at least a pair of opposed flat portions constituting the front side and the back side of the bag, and a pair of gusset side portions provided with fold lines folded inwardly into the bag. In the bag main body portion, the upper end portion of the bag main body portion is closed, the lower end portion is opened, and the bag main body portion includes at least a position near the side edge on either the front side or the rear side of the bag. A folding assisting portion is formed by joining the inner surfaces of the side surfaces of the gusset that overlap with the position in the vicinity of the side edge, and the side surface of the gusset is folded inward, and the planar portion and the side surface of the gusset are overlapped. Line segment extending upward from the intersection of the fold line of the side surface portion of the gusset and the lower end joint portion for closing the lower end portion of the flat portion toward the side edge of the corresponding flat portion, and the lower end joint Upper part The angle formed by the matching line segments is in the range of 35 to 55 °, and the bending assisting portion includes an intersection of the line segment extending upward and the side edge of the side surface portion of the gusset, and at the lower end joint portion. It is arrange | positioned in the position which does not touch.

  According to the present invention, when the gusset bag is filled with the contents, the folding auxiliary portion is formed at a position near the side edge of the bag main body, so that the vicinity of the folding auxiliary portion is a plane of the gusset bag. The opening of the side part and the gusset side part is restricted. Therefore, when the gusset bag is made self-supporting, the plane portion corresponding to the side edge of the plane portion, the line segment that coincides with the upper end of the lower end joint portion, and the intersection of the fold line of the gusset side surface portion and the lower end joint portion. It is possible to make it difficult for the contents to enter the triangular region surrounded by the line segment extending upward toward the side edge of the. In addition, since the folding assisting part is a trigger for folding, the folding assisting part is easily folded, and it is easy to form a stable bottom by bending the lower part from the folding assisting part to one side. Can be improved. Moreover, in order to improve the self-supporting property of the gusset bag, from the intersection of the entire triangular region or the fold line of the side surface portion of the gusset and the lower end joint portion, toward the side edge of the corresponding flat portion. On the line segment extending upward, it is not necessary to join the inner surfaces of the flat surface portion and the gusset side surface portion, and a wide lower end opening can be secured. In the case of a gusset bag having an open lower end, the contents are filled from the lower end opening, so that filling with a large filling nozzle is possible, and the contents can be filled easily in a short time.

  In the gusset bag according to the present invention, a chuck may be provided in the vicinity of the upper end portion of the bag body portion in parallel with the upper end portion so as to be a resealable gusset bag.

  In the gusset bag according to the present invention, a pour-out port may be provided at the upper end of the bag body.

  The gusset bag according to the present invention has at least a pair of opposing flat portions constituting the front side and the rear side of the bag, and a pair of gusset side portions provided with folding lines folded inwardly into the bag in a fold shape. In the bag body portion, the upper end portion and the lower end portion of the bag body portion are closed, and the bag body portion includes at least a position near the side edge on either the front side or the back side of the bag and a position near the side edge. Folding auxiliary portions are formed by joining the inner surfaces of the gusset side portions overlapping each other, and when the gusset side portions are folded inward and the flat portion and the gusset side portions are overlapped, the gusset side portions And a line segment extending upward from the intersection of the lower end joint part for closing the lower end part of the plane part toward the corresponding side edge of the plane part and a line segment coinciding with the upper end of the lower end joint part Toganasu The degree is in a range of 35 to 55 °, and the folding auxiliary portion includes an intersection of the line segment extending upward and the side edge of the side surface portion of the gusset, and is disposed at a position where the lower end joint portion is not touched. And the bag main body is filled with contents.

  According to the present invention, by forming the folding assist portion at a position near the side edge of the bag main body portion, the opening of the flat portion and the side surface portion of the gusset bag is limited in the vicinity of the folding assist portion. Therefore, when the gusset bag is made self-supporting, the line segment corresponding to the side edge of the flat surface portion and the upper end of the lower end joint portion, the fold line of the gusset side surface portion, and the intersection of the lower surface joint portion of the corresponding flat portion It is possible to make it difficult for the contents to penetrate into a triangular region surrounded by a line segment extending upward toward the side edge. In addition, since the folding assisting part is a trigger for folding, the folding assisting part is easily folded, and it is easy to form a stable bottom by bending the lower part from the folding assisting part to one side. Can be improved.

  According to the present invention, by forming the folding assisting portion at a position near the side edge of the gusset bag, it is easy to form a stable bottom by folding the lower side from the folding assisting portion to one side, and the self-supporting property of the gusset bag is improved. Can be improved. Further, even when the contents are filled from the lower end of the gusset bag, it is possible to ensure a wide opening width at the lower end of the gusset bag by forming a folding auxiliary portion at a position near the side edge of the gusset bag. It is possible to fill with a large filling nozzle, and the contents can be filled easily in a short time.

The gusset bag of the present invention includes a pair of opposing flat portions that constitute at least a front side and a rear side of the bag, and a pair of gusset side portions provided with a fold line folded inwardly into the bag. In the main body portion, the upper end portion of the bag main body portion is closed and the lower end portion is opened, and the bag main body portion includes at least a position near the side edge on either the front side or the rear side of the bag, and the side. A bending auxiliary part is formed by joining the inner surfaces of the side faces of the gusset that overlap with the position in the vicinity of the edge,
When the gusset side surface portion is folded inward and the flat surface portion and the gusset side surface portion are overlapped, the fold line of the gusset side surface portion and the intersection of the lower end joint portion for closing the lower end portion of the flat surface portion The angle formed by the line segment extending upward toward the corresponding side edge of the flat surface portion and the line segment coinciding with the upper end of the lower end joint portion is in the range of 35 to 55 °, and the bending assisting portion is It is arrange | positioned in the position which includes the intersection of the line segment extended to and the side edge of the said gusset side part, and does not touch a lower end junction part.

  Hereinafter, the gusset bag according to the present invention will be described in detail with reference to the drawings. In addition, each figure shown below is a schematic diagram and is different from an actual size.

  First, a first embodiment of preferred embodiments of a gusset bag according to the present invention will be described with reference to FIGS. FIG. 1 (A) is a perspective view showing an example of a gusset bag according to the present invention, and FIG. 1 (B) shows a preferred embodiment after the gusset bag according to the present invention is filled with contents. The figure which shows 1st embodiment, FIG. 2 is a figure which shows the state which folded the gusset side part of the gusset bag shown to FIG. 1 (A) inside, and overlap | superposed the said plane part and the said gusset side part. 3 is an enlarged schematic view of the folding auxiliary section shown in FIG. 2, FIG. 4 is an enlarged schematic view showing a specific shape of the folding auxiliary section shown in FIG. 2, and FIG. 5 is a gusset bag shown in FIG. It is a perspective view which shows the state which bent the line with the dotted line and formed the bottom part.

  As shown in FIG. 1 (A), the gusset bag 101 includes a pair of opposed flat portions 2 and 2 that constitute the front side and the back side of the bag, and a fold line 3a that is folded inwardly into the bag in the form of a fold. It is comprised from the bag main-body part 1 which has a pair of gusset side part 3 and 3 provided.

Further, as shown in FIG. 1 (B), the bag body 1 has side edges 2a, 2a of the flat surfaces 2, 2 and side edges 3b, 3b of the gusset side surfaces 3, 3 joined together. The upper end 4 of the bag body 1 is formed such that the gusset side surfaces 3, 3 folded inward are sandwiched between the side edges 2a, 2a of the flat portions 2, 2, and the upper edges 2b of the flat portions 2, 2 2b and the upper ends of the gusset side portions 3 and 3 are joined, and the upper end 4 of the bag body 1 is closed. Further, the bag body 1 is configured such that the gusset side surfaces 3 and 3 folded inward are sandwiched between the side edges 2a and 2a on both sides of the flat portions 2 and 2, and the lower edge of the flat portions 2 and 2 and The lower end edges of the gusset side portions 3 and 3 are joined, and the lower end portion 5 of the bag body 1 is closed. Furthermore, the bag main body 1 includes at least the positions of the plane portions 2 and 2 near the side edges 2a and 2a and the inner surfaces of the gusset side surfaces 3 and 3 that overlap the positions of the side edges 2a and 2a. Are joined to form a folding assisting portion 6. When the gusset bag 101 is filled with the contents, the folding auxiliary portion 6 is formed at a position in the vicinity of the side edges 2a and 2a, thereby matching the side edge 2a of the flat portion 2 and the upper end of the lower end joint portion 5a. In a triangular region surrounded by a line segment and a line segment extending upward from the intersection of the fold line of the side surface portion of the gusset and the lower end joint portion toward the side edge 2a of the corresponding flat surface portion, Therefore, it is possible to easily bend the lower side of the folding auxiliary portions 6 and 6 to one side along the dotted line connecting the upper ends of the two folding auxiliary portions 6 and 6. Thereby, as shown in FIG. 5, the flat bottom part 7 can be formed and the self-supporting property of the said gusset bag 101 can be improved.
In addition, by forming the bending assisting portion 6 at four locations in the vicinity of the side edges 2a and 2a of the plane portions 2 and 2 and not touching the lower end joint portion 5a, the shape retaining shape is maintained with the self-supporting property of the gusset bag 101. Can be improved.

  A pair of plane parts 2 and 2 and a pair of gusset side parts 3 and 3 which constitute bag body part 1 are formed with a packaging material film. The packaging film is not particularly limited, and films generally used for various packaging bodies can be used, and a laminated film mainly composed of plastic is usually used. As a layer structure of a laminated film, it can be set as the structure which laminated | stacked the base material layer, the intermediate | middle layer, and the innermost layer in order from the outer side, for example.

The base material layer has a total mechanical strength required for normal applications such as tensile strength, impact strength, and scratch resistance, and heat resistance against heating at the time of joining. In addition to solvent resistance and chemical resistance, performance such as printability and gas barrier properties is also required as required. The base material layer may have a single layer structure or a multilayer structure in which a plurality of layers are laminated as long as it has such performance. For example, a stretched polyester film such as polyethylene terephthalate (PET), a stretched polypropylene, and the like. (OPP), stretched polyolefin films such as high-density polyethylene (HDPE), stretched nylon (ONY), stretched films such as ethylene vinyl alcohol copolymer (EVOH), and laminates of these stretched films can be used. In order to improve the gas barrier property and moisture proof property of these stretched films, a metal such as aluminum (Al) or an inorganic oxide such as aluminum oxide or silicon oxide is deposited, polyvinylidene chloride (PVDC) or poly What coated (barrier coat) acrylic resin etc. can also be used. Moreover, paper, cellophane, etc. can also be used.
The thickness of the base material layer is not particularly limited and may be set as appropriate. However, it is usually preferable to set the thickness within a range of about 9 to 30 μm.

The intermediate layer is provided to improve the mechanical strength, moisture proofing, gas barrier property, tearing property of the film when opening the gusset bag, etc., and is appropriately selected according to the purpose. That's fine. Further, when there is no need to provide an intermediate layer, it may not be provided. The intermediate layer may be a single layer structure or a multilayer structure in which a plurality of layers are laminated. For example, plastic such as PET, OPP, HDPE, ONY, EVOH, polyvinyl alcohol, PVDC, Al foil, alloy foil, etc. A metal foil or the like can be used. When a metal foil or printed layer is used as the intermediate layer, or when a pigment is added to the adhesive that bonds the layers, light blocking properties can be imparted. Moreover, heat resistance can be provided when the film which has heat insulation functions, such as a nonwoven fabric and a foamed film, is used as an intermediate | middle layer. Further, a film obtained by depositing Al, silicon oxide, aluminum oxide, ceramic or the like on the plastic film can be used.
In order to improve the tearability of the film when opening the gusset bag, it is possible to stabilize the tearing direction of the film by matching the stretching direction of the stretched film used for the intermediate layer with the opening direction of the gusset bag. it can.

  The thickness of the intermediate layer is not particularly limited and may be set as appropriate. However, it is usually preferable to set the thickness within a range of about 6 to 25 μm.

  The innermost layer needs to have an adhesive property that allows the inner surfaces of the stacked laminated films to sufficiently adhere to each other by heat and pressure when a gusset bag is formed using the laminated film. Moreover, since it is in direct contact with the contents, hygiene and resistance to the contents are also required.

The innermost layer may be a single layer structure or a multilayer structure. For example, linear low density polyethylene (LLDPE), unstretched polypropylene (CPP), low density polyethylene (LDPE), ethylene vinyl acetate copolymer ( EVA), ionomers and the like can be used.
The thickness of the innermost layer is not particularly limited and may be set as appropriate. However, it is usually preferable to set the thickness within the range of about 60 to 120 μm.

  The base material layer, the intermediate layer, and the innermost layer can be laminated by a known method, which can be laminated by a dry lamination method using an adhesive, or a thermoadhesive resin can be laminated by an extrusion lamination method. You can also

  In addition, the laminated film used for a pair of plane parts 2 and 2 and a pair of gusset side parts 3 and 3 which comprise the bag main-body part 1 may be the same, and may differ respectively.

Next, the position where the folding assisting part 6 is formed and the size of the folding assisting part 6 in the bag body 1 will be described with reference to FIGS. 2 and 3.
The lower end joint 5a shown in FIG. 2 is a joint for closing the lower end 5 of the flat portion 2 after filling the bag body 1 with contents.
The bending assisting portion 6 is a line segment that coincides with the upper end of the lower end joint portion 5a from the intersection X1 of the lower end joint portion 5a and the fold line 3a of the gusset side surface portion to the corresponding side edge 2a of the flat portion 2. The angle formed by A and the line segment B extending upward from the intersection X1 toward the corresponding side edge 2a of the plane portion 2 is in the range of 35 to 55 °, and the line segment B and the plane portion 2 It is formed at a position that includes the intersection X2 with the side edge 2a and does not touch the lower end joint portion 5a.
Thereby, when the inside of the gusset bag 101 is filled with contents, since the opening of the flat portion of the gusset bag and the side surface portion of the gusset bag is restricted in the vicinity of the folding assisting portion 6, the side edge 2a of the flat portion 2 and The contents can be made difficult to enter into the triangular region surrounded by the line segment A and the line segment B, and it is easy to form a stable bottom part by bending the lower part from the folding auxiliary part 6 to one side, The independence of the gusset bag 101 can be improved. Further, in order to improve the self-supporting property of the gusset bag 101, all of the triangular area surrounded by the side edge 2a of the plane portion 2, the line segment A, and the line segment B or the entire length of the line segment B In this case, since it is not necessary to join the inner surfaces of the flat surface portion 2 and the gusset side surface portion 3, a wide opening width of the lower end portion 5 of the bag main body portion 1 can be ensured. Therefore, even when filling the contents from the lower end portion 5 of the gusset bag 101, filling with a large filling nozzle is possible, and the contents can be filled easily in a short time.

  Further, from the viewpoint of improving the self-supporting property of the gusset bag 101, the angle formed by the line segment A and the line segment B is more preferably 40 to 50 °.

The horizontal width s of the bending assisting portion 6 is not particularly limited, but is preferably 15 to 30%, more preferably 20 to 25% with respect to the width of the gusset side surface portion 3. . When the horizontal width s of the folding auxiliary portion 6 is less than 15% with respect to the width of the gusset side surface portion 3, the opening of the plane portion and the gusset side surface portion is difficult to be restricted, and it is difficult to cause the bending. When the gusset bag is made self-supporting, the effect of preventing the contents from entering the triangular area does not work. Moreover, when it exceeds 30%, when filling the content from the lower end part 5 of the said gusset bag 101, there exists a possibility that the opening width of the said lower end part 5 may become narrow.
Moreover, the width t in the height direction of the folding assisting portion 6 is not particularly limited, but is preferably 10 to 300% with respect to the width s in the horizontal direction of the folding assisting portion 6, and more preferably 50 to It is preferably 150%. When the width t in the height direction of the folding assisting portion 6 is less than 10% with respect to the width s in the horizontal direction of the folding assisting portion 6, it is difficult to cause folding, and when it exceeds 300%, the gusset bag 101 When the contents are filled from the lower end portion 5 of this, the opening width of the lower end portion 5 may be narrowed.

  The horizontal width s of the bending assisting portion 6 changes according to the width of the gusset side surface portion 3. Therefore, the self-supporting property of the gusset bag can be improved by forming the folding assisting portion 6 having the position specified above and the size of the specified range in the gusset bag 101. Moreover, the capacity | capacitance of the gusset bag suitable for ensuring the wide opening width of the said gusset bag is 100 mL-2L.

In the above description, the isosceles triangle is used as the folding assisting portion 6. However, it is difficult for the contents to enter the triangular area, the folding is triggered, and the lower end opening width of the gusset bag is widened. The shape is not particularly limited as long as it can be ensured. Examples of the shape of the bending assisting portion 6 include a quadrangle shown in FIG. 4A, an inverted substantially U-shape shown in FIG. 4B, and a side edge 2a of the flat portion 2 shown in FIG. 4C. A straight line heading diagonally downward from the top.
In addition, in the case of a shape having an apex such as the above isosceles triangle, there is a risk of damaging the gusset bag due to stress concentration on the apex, so that the apex may be rounded as shown in FIG. preferable.

  Examples of the contents of the gusset bag 101 include powder and liquid. When the content is powder, the effect of making the powder difficult to enter in the triangular region surrounded by the side edge 2a of the plane portion 2 and the line segment A and line segment B is high.

FIG. 6 is a second embodiment of the preferred embodiments of the gusset bag according to the present invention.
A gusset bag 101 </ b> A shown in FIG. 6 is provided with a chuck 8 in the vicinity of the upper end 4 of the bag main body 1 in parallel with the upper end 4. The chuck 8 includes a pair of engaging pieces (not shown) that engage with each other. The engaging pieces cross from one end to the other end in the width direction of the upper end portion 4 and engage with each other. They are aligned so as to fit with each other and joined to the inner surfaces of the pair of opposing flat portions 2 and 2.
Since the gusset bag 101A according to the present invention can secure a wide opening width of the lower end portion 5 of the bag main body portion 1 by forming the folding auxiliary portion 6 at a position in the vicinity of the side edge, Filling is possible, the contents can be easily filled from the lower end portion 5 in a short time, and the self-supporting property after filling the contents is excellent. Moreover, since the opening part after opening an upper end part can be reclosed by providing the said chuck | zipper 8 in the said gusset bag 101A, it can be used repeatedly.

  The material of the chuck 8 is not particularly limited, but is usually the same material as the innermost layer forming the innermost surface of the laminated film, which is a packaging material film, from the viewpoint of adhesion to the inner surface of the packaging material film constituting the flat portion 2. Formed with. For example, a single layer of polyolefin such as polypropylene or polyethylene, or a co-extruded resin can be used. The chuck 8 can be heat-sealed at a desired position on the inner surface of the packaging material film by heat and pressure or high frequency.

FIG. 7 is a third embodiment of the preferred embodiments of the gusset bag according to the present invention.
The gusset bag 101B shown in FIG. 7 is provided with a dispensing inlet 9 at the upper end 4 of the bag body 1. The pouring inlet 9 includes a pouring inlet forming member 10 and a cap 14. A screw thread that can be engaged with a screw groove provided in the cap 14 is provided on the outer peripheral surface of the upper end of the pouring inlet forming member 10, and is closed by screwing with the cap 14.
The gusset bag 101B according to the present invention can secure a wide opening width of the lower end portion 5 of the bag body portion 1 by forming the folding auxiliary portion 6 at a position in the vicinity of the side edge. Filling is possible, the contents can be easily filled from the lower end portion 5 in a short time, and the self-supporting property after filling the contents is excellent. Further, the gusset bag 101B provided with the pouring inlet 9 is used as a content for a fluid such as a liquid.

  The material for forming the inlet / outlet forming member 10 is not particularly limited. Usually, the outlet / inlet forming member 10 has a joint portion 13 formed of the flat portions 2 and 2 or the flat portion 2 and the side portion 3. Since it is fixed to the bag body 1 by bonding between the packaging films simultaneously with the bonding between the packaging films, the adhesive film has adhesiveness to the packaging film. And it is necessary to form with the material which has the heat resistance with respect to the heating in a joining process. Therefore, it is generally formed of the same plastic material as the innermost layer of the laminated film. It should be noted that the inlet / outlet forming member 10 may be a molded product using a material other than plastic as long as it can be bonded to the packaging material film at the joint 13.

  Next, the manufacturing method of the gusset bag of this invention is demonstrated as an example.

  First, a packaging film cut into a rectangular shape constituting the pair of flat portions 2 and 2 and a packaging film cut into a rectangular shape constituting the pair of gusset side portions 3 and 3 are prepared. The wrapping film constituting the gusset side portions 3 and 3 is provided with a fold line 3a extending in the longitudinal direction of the film at the center, and the wrapping film is folded in two.

Next, the packaging film constituting the pair of flat portions 2 and 2 and the packaging film constituting the pair of gusset side portions 3 and 3 are joined to form the cylindrical bag body 1. Moreover, it is good also as the cylindrical bag main-body part 1 by joining the both ends of one rectangular film, making it cylindrical, and folding a gusset part.
In the step of forming the bag main body 1, the folding line 3 a is directed inward of the bag main body 1 so that the packaging material film constituting the gusset side surfaces 3 and 3 is folded into the center of the bag main body 1. The two side edges 3b and 3b are joined to the side edges 2a and 2a of the two packaging material films constituting the flat portions 2 and 2, respectively. Thereby, the cylindrical bag main-body part 1 which has a pair of gusset side part 3 and 3 folded so that both the plane parts 2 and 2 may oppose and the fold line 3a may face inward is formed. Next, at least the position in the vicinity of the side edges 2a and 2a of one surface of the flat surface portions 2 and 2 and the inner surfaces of the gusset side surface portions 3 and 3 overlapping the positions in the vicinity of the side edges 2a and 2a are connected to the flat surface portion 2. , 2 from the outside, by pressing and heat-sealing a heat seal bar, the bending auxiliary portion 6 having a desired shape and size is formed.
Further, the upper end 4 of the bag body 1 is formed so that the gusset side portions 3 and 3 folded inward are sandwiched between the side edges 2a and 2a of the flat portions 2 and 2 so 2b and 2b and the upper end edges 3c and 3c of the gusset side parts 3 and 3 are joined, and the upper end part 4 of the bag body 1 is closed.
Furthermore, after attaching the opening part of the lower end part 5 of the said gusset bag 101 to a filling machine and filling the contents, the lower end part 5 of the said bag main body part 1 is the gusset side part 3, 3 folded inwardly Is sandwiched between the side edges 2a and 2a on both sides of the flat surface portions 2 and 2, the lower end edge of the flat surface portions 2 and 2 and the lower end edge of the gusset side surface portions 3 and 3 are joined, and the lower end portion 5 of the bag body portion 1 Is blocked.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.

It is a perspective view which shows an example of the gusset bag which concerns on this invention. It is a perspective view which shows an example of suitable embodiment after filling the gusset bag which concerns on this invention with the contents. It is a top view which shows the state which folded the gusset side part of the gusset bag shown in FIG. 1 inside, and overlap | superposed the said plane part and the said gusset side part. It is an expansion schematic diagram of the bending auxiliary | assistant part shown in FIG. It is an expansion schematic diagram which shows the specific shape of the bending auxiliary | assistant part shown in FIG. It is a perspective view which shows an example of the gusset bag which concerns on this invention. It is a perspective view which shows an example of the gusset bag which concerns on this invention. It is a perspective view which shows an example of the gusset bag which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Gazette bag 1 Bag main-body part 2 Flat part 2a Side edge 2b Upper end edge 3 Gazette side surface part 3a Folding line 3b Side edge 3c Upper end edge 4 Upper end part 5 Lower end part 5a Lower end junction part 6 Bending auxiliary part 7 Bottom part 8 Chuck 9 Outlet 10 Outlet / entrance forming member 14 Cap

Claims (5)

In the bag main body having at least a pair of opposed flat portions constituting the front side and the rear side of the bag and a pair of gusset side portions provided with fold lines folded inwardly into the bag, The upper end of the part is closed, the lower end is open, and the bag main body overlaps at least the position near the side edge on either the front side or the back side of the bag and the position near the side edge. A bending auxiliary part is formed by joining the inner surfaces of the gusset side parts,
When the gusset side surface portion is folded inward and the flat surface portion and the gusset side surface portion are overlapped, the fold line of the gusset side surface portion and the intersection of the lower end joint portion for closing the lower end portion of the flat surface portion The angle formed by the line segment extending upward toward the corresponding side edge of the flat surface portion and the line segment coinciding with the upper end of the lower end joint portion is in the range of 35 to 55 °, and the bending assisting portion is A gusset bag comprising an intersection of a line segment extending to a side edge of the side face portion of the gusset and being disposed at a position not touching the lower end joint portion.   The gusset bag according to claim 2, wherein a chuck is provided in the vicinity of the upper end portion of the bag main body portion in parallel with the upper end portion.   The gusset bag according to claim 1, wherein a pour-out port is provided at an upper end portion of the bag main body portion. In the bag main body having at least a pair of opposed flat portions constituting the front side and the rear side of the bag and a pair of gusset side portions provided with fold lines folded inwardly into the bag, The upper end portion and the lower end portion of the bag portion are closed, and the bag body portion includes at least a position near the side edge on either the front side or the back side of the bag and an inner surface of the side surface portion of the gusset that overlaps with the position near the side edge. A bending auxiliary part that joins each other is formed,
When the gusset side surface portion is folded inward and the flat surface portion and the gusset side surface portion are overlapped, the fold line of the gusset side surface portion and the intersection of the lower end joint portion for closing the lower end portion of the flat surface portion The angle formed by the line segment extending upward toward the corresponding side edge of the flat surface portion and the line segment coinciding with the upper end of the lower end joint portion is in the range of 35 to 55 °, and the bending assisting portion is Including the intersection of the line segment extending to the side edge of the side face portion of the gusset, and disposed at a position not touching the lower end joint portion, and the bag body portion is filled with contents. And a gusset bag.   The gusset bag according to claim 4, wherein a chuck is provided in the vicinity of the upper end portion of the bag main body portion in parallel with the upper end portion, or a pouring inlet is provided at the upper end portion of the bag main body portion.

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