JP5921027B2 - Packaging bag - Google Patents

Description

  The present invention belongs to the technical field of packaging bags for storing solids, powders, fluid contents, etc., and in particular, after opening the opening end side, the contents are partially left behind. The present invention relates to a packaging bag that can be resealed in a state.

  Conventionally, a packaging bag with a zipper is often used as a packaging bag in which a part of the contents is left in the bag as it is and the opening portion can be repeatedly sealed. This packaging bag is configured by providing a zipper part for opening and closing the opening part at a site inside the upper side seal part and heat-sealing the opening end side from the zipper part. To remove the stored contents, tear the hand between the zipper part and the heat seal part using a notch, or cut with a cutting tool such as scissors or a knife, and then disengage the zipper part and open it. To do. And after taking out the predetermined amount of contents, it reseals by closing a zipper part.

  On the other hand, as a packaging bag that can be resealed without using a zipper, a packaging bag of a type in which a sealing label is pasted on the outer surface of the bag is known. In this packaging bag with a label, when the opened packaging bag is resealed, the sealing label is peeled off from the outer surface of the bag, the opening portion of the bag is folded an appropriate number of times, and the sealing label is applied so as to lock it. To re-seal.

Japanese Utility Model Publication No. 7-44729 Japanese Utility Model Publication No. 6-65241 JP 2000-326994 A

  The above-described packaging bag with a zipper has a problem of cost increase due to attaching a zipper, and if the contents are, for example, powder, the fitting strength is reduced due to the influence of powder biting at the fitting part of the zipper There's a problem. On the other hand, the packaging bag with a label has a problem that the adhesive strength of the sealing label is lowered by repeating the sealing operation many times.

  At the time of resealing, in the case of a packaging bag with a zipper, an operation to fit the zipper is necessary. In the case of a packaging bag with a label, the sealing label is pasted after folding the opening of the bag an appropriate number of times. There is also a problem that the operation for resealing is not so easy.

  The present invention has been made in view of the problems of the conventional packaging bags as described above, and the object of the present invention is to re-seal with a simple operation and repeat the re-seal operation. An object of the present invention is to provide a packaging bag that can be sealed as many times as it was originally.

To achieve the above object, a packaging bag according to the present invention comprises a packaging material formed by laminating a sealant layer on an inner surface, has a side seal part of at least the left and right both sides, the filling port of the contents thereof opening ready to upper seal portion which is heat-sealed is provided, opening when the packaging types ing astride that an open end is provided from the side seal portion of the left and right portions of the inner its upper side seal portion It is a bag, and a protruding piece straddling the left and right side seal portions is provided on the outer surface of either the front surface side or the back surface side at a position further inside than the portion that becomes the opening end, and the protruding piece The deformed seal portion, whose width in the height direction gradually narrows from the center of the root portion toward the side seal portions on both sides, is formed to have a mountain shape when viewed from the tip edge, and the deformed seal portion is Hand reaching the seal Has become a straight seal portion perpendicular to the side sealing portions at the height of the straight seal portion is 5 to 10 mm, wherein the width of the straight sealing portion is 2 to 5 mm.

  The packaging bag of the present invention is formed by opening an opening end straddling the left and right side seal portions at a site inside the upper side seal portion, and after taking out only a part of the contents from the opening end, inside the opening end. When a projecting piece is folded back with its base portion as the base point, the folded portion is prevented from returning due to the presence of the projecting piece, and the closed state is maintained, so that the bag is folded back with a simple operation. be able to. Moreover, in the packaging bag with a zipper or the packaging bag with a label, since the fitting force of the zipper and the adhesive strength of the sealing label are reduced, the resealability gradually decreases when the resealing operation is repeated. In this case, since the bag is resealed by folding it back, the resealability does not deteriorate even if the reseal operation is repeated many times.

  And since the projecting piece is a mountain-shaped deformed seal part, when the projecting piece is pushed in the opposite direction on the left and right sides, the projecting piece and the side seal part are slightly warped on the side where the packaging material is stretched and not folded back. It becomes a state where the lock is applied at the corner where the crossing and the like, and the folded portion is prevented from being lifted, so that the resealed state is good.

  In addition, by making the vicinity of the left and right ends of the deformed seal part straight seal parts, even if there is expansion or contraction of the packaging material, misalignment of the seal is absorbed, and the side seal part overlaps with the straight seal part of the deformed seal part. The corner portion where the deformed seal portion and the side seal portion intersect does not become an acute angle, and when the content is powder or the like, it can be prevented that the corner portion accumulates and causes a pinhole.

It is a perspective explanatory view showing an example of a packaging bag according to the present invention. It is a cross-sectional explanatory drawing in the AA line of FIG. FIG. 3 is a cross-sectional explanatory view taken along line BB in FIG. 1. It is a partially expanded plan view which shows the principal part in the packaging bag of FIG. It is a perspective explanatory view which shows the state which resealed the packaging bag of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

The packaging bag 10 shown in FIGS . 1 to 3 is in the form of a standing pouch. As shown in the figure, the packaging material 11 having a longer top and bottom size W-folded at the bottom and the packaging material having a shorter top and bottom size are used. The projecting piece 13 is formed so as to cross the left and right sides, and is further adhered linearly at the side seal portions 14 on both the left and right sides. It has a combined structure. The left and right side seal portions 14 are each formed with a notch 15 for opening at a corresponding position above the protruding piece 13.

The protruding piece 13 is formed so as to straddle the side seal portions 14 on both the left and right sides and orthogonal to the side seal portions 14. The projecting piece 13 has a deformed seal portion 20 whose width in the height direction gradually decreases from the center of the root portion 13a toward the side seal portions 14 on both sides, and has a mountain shape when viewed from the front edge. As shown in an enlarged view in FIG. 4 , the deformed seal portion 20 is a straight seal portion 20 a that is orthogonal to the side seal portion 14 before reaching the side seal portion 14. In this example, the boundary line of the deformation seal portion 20 is determined by an arc having a radius R, and the straight seal portions 20a on both the left and right sides are rectangular with a height of x and a width of y. Note that the term “perpendicular” includes the case where the straight seal portion 20a intersects the side seal portion 14 at an angle of ± 5 °.

  The deformed seal portion 20 of the projecting piece 13 is sealed using a seal bar (not shown). However, when the seal bar has only a mountain shape, when the seal bar is shifted to the left and right, the deformed seal A portion having an insufficient height is generated in the portion 20. By providing the straight seal portion 20a on the deformed seal portion 20, the height of the deformable seal portion 20 becomes a certain level and the strength of the protruding piece 13 can be maintained, so that the reseal effect can be improved.

  The height x of the straight seal portion 20a in the deformed seal portion 20 is preferably 5 to 10 mm. If the height x is less than 5 mm, it is difficult to maintain the strength of the protruding piece 13, and if it is higher than 10 mm, a wasteful portion of the packaging material increases, which is not preferable. Moreover, it is preferable that the horizontal width y of the straight seal part 20a shall be 2-5 mm. When the lateral width y is less than 2 mm, it is difficult to absorb the positional deviation in the left-right direction that occurs when sealing the deformed seal portion 20, and when the width is larger than 5 mm, the bent protruding piece 13 is pushed in the opposite direction on the left and right. This is not preferable because it is difficult to be locked at the corner where the protruding piece 13 and the side seal portion 4 intersect.

The manufacturing procedure of the packaging bag 10 by the bag making machine is, for example, as follows. While conveying the long packaging material, first, the projecting piece 13 is sealed to form the deformed seal portion 20, and the bottom hole 16 necessary for bonding the both ends of the bottom portion of the standing pouch on the front and back is formed. The punch hole is processed. Subsequently, while the packaging material is conveyed as it is, W-folding of the bottom portion and sealing of the bottom seal portion 17 are performed. In addition, the dotted line in the bottom part of FIG. 1 shows that the lower part is the gusset part 18 formed by W folding. Next, after the side seal portion 14 is formed, the upper side is cut off to form a filling port, and the opening notch 15 and upper and bottom corners are punched in a subsequent process. Finally, it is cut with a guillotine blade so as to separate one bag at the side seal portion 14. Thereby, the packaging bag 10 shown in FIGS. 1-3 is manufactured.

  And by making the right-and-left both ends vicinity in the deformation | transformation seal | sticker part 20 of the protrusion piece 13 into the straight seal | sticker part 20a, even if there exists expansion / contraction of a packaging material, etc. in this bag making process, the side seal | sticker part 14 of the deformation | transformation seal | sticker part 20 It overlaps with the straight seal portion 20a, that is, the positional deviation when sealing the deformed seal portion 20 is absorbed by the straight seal portions 20a near the left and right ends.

  The packaging bag 10 shown in FIG. 1 is sent to a filling process in a state where a plurality of packaging bags 10 are collected, and the contents are filled there. That is, the upper side seal portion 19 is formed by filling the contents from the opened upper portion and heat-sealing the portion indicated by the dotted line in FIG. 1 so as to close the opening. Through such a filling process, the packaging bag 10 is closed by the upper seal portion 19 in addition to the side seal portions 14 on both the left and right sides, and the packaging material is broken by using the opening notch 15 as a handle. By doing so, an opening end straddling the left and right side seal portions 14 can be formed and opened at a site inside the upper side seal portion 19. And the protrusion piece 13 which straddles the left and right side seal parts 14 in the position further inside from the site | part used as an opening end is provided in either one outer surface of the surface side or the back surface side.

  The packaging bag 10 has straight seal portions 20a on both sides of the deformation seal portion 20 of the protruding piece 13, and the deformation seal portion 20 overlaps the side seal portion 14 at the straight seal portion 20a. The corner portion where the portion 20 intersects is not an acute angle. Therefore, when the content is a powder or a granular material, they can be prevented from entering the corner portion and causing a pinhole.

The packaging bag 10 filled with the contents as described above can be easily re-sealed after the bag end portion is cut out from the opening notch 15 and a part of the contents is taken out. That is, when the bag is folded up and down with the base portion of the protruding piece 13 inside the opening end as a base point, as shown in FIG. 5 , the folded portion returns due to the protruding piece 13 (the folded portion is the original portion). The repulsion of returning to (2) is suppressed, and the closed state is maintained in a sealed state.

And the protrusion piece 13 forms the deformation | transformation seal | sticker part 20 by the moderate curve shape that the width of a height direction becomes narrow gradually toward the both sides from the center sealed to the root, and the side seal part on both right and left sides 14 is a straight seal portion 20a that overlaps with a small width, so that a triangular unsealed portion connected to the inside of the bag is formed at the intersection of the deformed seal portion 20 and the side seal portions 14 on both the left and right sides. For this reason, after the bag is folded up and down, as shown by the arrows in FIG. 5 , the vicinity of the intersection of the protruding piece 13 and the side seal portion 14 is picked up and reverse to the folded portion. If (from the front side of FIG. 5 toward the rear side) pushing slightly warped on the side free of the portion packaging material is folded back taut and the projecting piece 13 and the left and right sides of the side seal portions 14 intersect towards the A state as the lock is applied at parts, it is possible to suppress the rebound of the folded portion (lift).

  As the packaging material used for the packaging bag of the present invention, a laminated film mainly composed of plastic is used. In a simple configuration, a laminated film having a structure in which a sealant layer is laminated on a base film layer is used. Depending on the contents to be filled in, the handling conditions after filling, or the required performance such as water vapor and other gas barrier properties, light shielding properties, various mechanical strengths, the base film layer and the sealant layer For example, a laminated film having a structure in which a water vapor or other gas barrier layer, a light shielding layer, a strength improving layer, or the like is laminated as an intermediate layer is used.

  The base film layer, water vapor or other gas barrier layer, light shielding layer, intermediate layer such as a strength improving layer, sealant layer, etc. may be formed as a single layer, but may be formed by laminating a plurality of layers. May be.

  In addition to the biaxially stretched film of polyester such as polyethylene terephthalate (PET) and polyethylene naphthalate, the base film layer is biaxially stretched of polyamide such as nylon 6, nylon 66, MXD6 (polymetaxylylene adipamide). A film, a biaxially stretched polypropylene film (OPP), etc. can be used conveniently.

  Examples of the gas barrier layer include saponified ethylene / vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), aluminum foil (AL), silica, alumina, Biaxially stretched nylon film (ON film) provided with a vapor deposition layer such as aluminum or a coating layer of PVDC, polyethylene terephthalate (VMPET) provided with a vapor deposition layer such as silica, alumina, aluminum, biaxially stretched polyethylene terephthalate film (PET) Film), a biaxially oriented polypropylene film (OPP film), and the like can be used. Among these, since the film provided with the aluminum foil or the aluminum vapor deposition layer is opaque, it can also serve as a light shielding layer.

  As the strength improving layer, any one of the base films may be additionally laminated as appropriate, and a biaxially stretched high-density polyethylene film or the like may also be laminated as a moisture-proof layer.

  In addition, the base film layer is made of an easily tearable uniaxially stretched polypropylene film, a uniaxially stretched high density polyethylene, an easily tearable biaxially stretched polyester film ("Emblet" PC (easy tearable in the MD direction), Unitika Ltd.) Etc.), and stacking so that the stretching direction coincides with the tearing direction when the bag is opened, it is possible to facilitate tearing and stabilize the directionality as an easy-opening means. .

  A known dry lamination method or extrusion lamination method (sandwich lamination method) can be used for laminating the base film layer and an intermediate layer such as a gas barrier layer, a light shielding layer, or a strength improving layer.

  For the sealant layer, in addition to low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene -Acrylic ester copolymer-Polypropylene (VMPP) provided with a vapor deposition layer such as ionomer, polypropylene (CPP), silica, alumina, aluminum, or a copolymer thereof can be used.

  For the lamination of the sealant layer, the above resin can be formed into a film and laminated by a dry lamination method or an extrusion lamination method, or the above resin can be extruded and laminated. However, in the case where the content easily penetrates into the sealant layer, it is preferable to laminate by a dry lamination method.

  As a specific example of such a laminated film mainly composed of plastic, a packaging material having the following layer structure can be typically mentioned. The following 1) to 10) are laminated films by a dry lamination method, and each layer is bonded with an adhesive. In addition, the value in () shows the thickness of each layer.

1) PET (12 μm) / CPP (30 to 150 μm)
2) PET (12 μm) / LLDPE (30 to 150 μm)
3) PET (12 μm) / VMPET (12 μm) / LLDPE (30 to 150 μm)
4) PET (12 μm) / VMPET (12 μm) / CPP (30 to 150 μm)
5) PET (12 μm) / AL (6-7 μm) / LLDPE (30-150 μm)
6) OPP (20 μm) / CPP (30 to 150 μm)
7) OPP (20 μm) / LLDPE (30 to 150 μm)
8) OPP (20 μm) / VMPP (30 to 150 μm)
9) VMPET (12 μm) / CPP (30 to 150 μm)
10) PET (12 μm) / AL (6-7 μm) / CPP (30-150 μm)

  As the packaging material used for the packaging bag of the present invention, in addition to the laminated film mainly composed of the plastic as described above, a packaging material having paper in the layer structure can also be used. As a laminate of such papers, a packaging material having the following layer structure can be exemplified. Since the repulsive force of paper is lower than that of plastic, the resealing effect can be enhanced as compared with the case of being made of only plastic. The following 1) to 4) are laminated films by a dry lamination method, and each layer is bonded with an adhesive. The following 5) to 11) are laminated films by an extrusion lamination method, and PE (polyethylene) serves as an adhesive layer. In addition, the value in () shows the thickness of each layer.

1) Paper (30-60 g / m ² ) / CPP (30-150 μm)
2) Paper (30-60 g / m ² ) / LLDPE (30-150 μm)
3) Paper (30-60 g / m ² ) / AL (6-7 μm) / CPP (30-150 μm)
4) Paper (30-60 g / m ² ) / AL (6-7 μm) / LLDPE (30-150 μm)
5) Paper (30-60 g / m ² ) / PE (15-30 μm) / AL (6-7 μm) / PE (15-30 μm)
6) Paper (30-60 g / m ² ) / PE (15-30 μm) / AL (6-7 μm) / PE (15-30 μm) / CPP (30-150 μm)
7) Paper (30-60 g / m ² ) / PE (15-30 μm) / AL (6-7 μm) / PE (15-30 μm) / LLDPE (30-150 μm)
8) PET (12 μm) / PE (15-30 μm) / paper (30-60 g / m ² ) / PE (15-30 μm) / AL (6-7 μm) / PE (15-30 μm)
9) PET (12 μm) / PE (15-30 μm) / Paper (30-60 g / m ² ) / PE (15-30 μm) / AL (7 μm) / PE (15-30 μm) / CPP (30-150 μm)
10) PET (12 μm) / PE (15-30 μm) / Paper (30-60 g / m ² ) / PE (15-30 μm) / AL (6-7 μm) / PE (15-30 μm) / LLDPE (30-150 μm) )
11) PET (12 μm) / PE (15-30 μm) / VMPET (12 μm) / PE (15-30 μm) / LLDPE (30-150 μm)

A packaging bag for storing powdery seasonings was prepared. Here, the standing pouch shown in FIG. 1 is prepared using a laminated film having a layer structure of “PET (12 μm) / AL (7 μm) / LLDPE (60 μm)” as a packaging material, and the inside of the standing pouch is inserted into the inside. The seasoning was filled, and the upper side seal part was closed by heat sealing. The created packaging bag has an overall height of 190 mm, an overall width of 140 mm, a distance from the bottom to the root portion 13a of the protruding piece 13 of 135 mm, a height of the protruding piece 13 of 15 mm, and a left and right width of the deformation seal portion 20 of 120 mm, straight The height x of the seal portion 20a was 7 mm, and the lateral width y of the straight seal portion 20a was 2 mm.

  The packaging bag is opened and only a small amount of seasoning is taken out. When the bag is folded up and down with the root portion 13a of the protruding piece 13 inside the opening end as a base point, the folded portion is slightly returned. The closed state in a sealed state was well maintained. Further, when the vicinity of the intersection of the protruding piece 13 and the side seal portion 14 is picked and pushed in the direction opposite to the folded portion, the packaging material is slightly warped to the side without the folded portion, and the protruding piece 13 and the left and right sides It was in a state where the lock was applied at the corner where the side seal portion 14 intersects, and repulsion of the folded portion could be suppressed.

  The packaging bag of the present invention is not limited to a packaging bag of a type that contains a substance that dislikes drying, such as a solid or powder, and may be a fluid content. Further, the present invention can be widely applied to three-side seal bags, four-side seal bags, and the like other than those described above.

  Moreover, the packaging bag of this invention can also be used for the packaging bag for retorts, and the packaging bag for microwave ovens.

DESCRIPTION OF SYMBOLS 10 Packaging bag 11,12 Packaging material 13 Protruding piece 13a Root part 14 Side seal part 15 Notch for opening 16 Bottom hole 17 Bottom seal part 18 Gusset part 19 Upper side seal part 20 Deformation seal part 20a Straight seal part 21 Unseal part

Claims (1)

Made from the packaging material formed by laminating a sealant layer on an inner surface, at least it has a side seal portions of the left and right both sides, ready to upper seal part opening a filling port of the contents thereof is heat sealed is provided , a Ru type packaging bag name astride that an open end is provided in the side seal portion of the left and right portions of the inner from the upper side seal portion upon opening, one of the outer surface of the surface side or back side Is provided with a protruding piece straddling the left and right side seals at a position further inside than the part that becomes the opening end, and the protruding piece gradually moves from the center of the root part toward the side seal parts on both sides. deformable seal part width in the height direction is narrowed is formed so as to be viewed from the front end edge chevron-shaped, straight its deformed seal portion which at the front reaching the side seal section perpendicular to the side seal portion Has become le moiety, the height of the straight seal portion is 5 to 10 mm, packaging bag width of the straight seal portion characterized in that it is a 2 to 5 mm.

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