JP4994612B2 - Gusset type packaging bag - Google Patents

Description

  The present invention relates to a gusset type packaging bag that can be easily opened and resealed.

Conventionally, the content storage volume [packaging internal volume (cm ³ ) / packaging material area (cm ² ) ratio] is large, the packaging material cost per unit content of the content is low, and the upright state The gusset-type packaging bag is used as a bag suitable for a large amount of contents because it is advantageous in terms of space since it can be displayed on the market and the product looks good.

  However, gusset-type packaging bags have folds with a V-shaped cross section on both sides, and V-shaped and I-shaped cuts and cuts are provided at the edges perpendicular to the fold-off part from which this fold-up part is removed. The bag is opened using this as an opening start means. When the bag is opened by this opening start means, it opens in an irregular shape in the longitudinal direction (direction parallel to the folding part). In the case of contents such as powder or granules, the contents are not There are problems such as spilling and scattering to the surroundings, and when storing contents remaining after use, there is a problem that it is quite complicated to close the opened opening.

  Then, the gusset type packaging bag which solves the said problem is proposed (for example, refer patent document 1). The idea described in Patent Document 1 is a proposal in which a device for opening a gusset-type packaging bag in a lateral direction (a direction perpendicular to the folding portion) is incorporated, and a side seal portion is provided on a lateral side portion of the bag body. In addition, the side seal portion is provided with a notch capable of tearing the inside of the opening seal portion in the lateral direction, and the folded inner tip corner portion and the front and back surfaces on the planned tear line extending from the notch are spot-like at the folding portion located on the opposite side of the notch It is a gusset type packaging bag having a structure integrated by welding at the heat seal portion of the gusset, and the gusset type packaging bag is formed in this way so that the gusset type packaging bag has a substantially constant shape in the lateral direction (direction perpendicular to the folding portion). Even in the case of contents such as powders and granules that can be opened, there is no risk of the contents spilling at the time of opening, and the opened opening can be easily stored when storing the contents remaining after use Gukoto is that it is.

However, when the present inventor actually tried to tear and open the bag based on the idea described in Patent Document 1, it can be easily torn up to the corner of the folding end on the opening side, but it is further torn and torn. When the tip reached the folded internal tip corner of the spot-like heat seal portion, the folded internal tip corner became a large anti-tear portion at the time of tearing, and could not be torn smoothly. Also, as the resealing means, the opening end is bent to prevent intrusion of dust, etc., and the purpose is achieved when the bag contains plastically deformed material such as aluminum foil. However, the object cannot be achieved if a material that undergoes plastic deformation is not included.
Japanese Utility Model Publication No. 5-26838

  Therefore, the present invention can be easily opened in a direction orthogonal to the folded portion, can obtain an opening having a substantially constant shape, and the folded portion on the opened side is pulled out to serve as a spout. It is possible to provide a gusset type packaging bag that can be easily taken out and can be reliably resealed.

In order to achieve the above-mentioned object, the inventor of the present invention according to claim 1 is configured such that the opposing edge of a rectangular laminate including at least a base material layer and an inner layer made of a heat-adhesive resin is formed on the inner layer. A cylindrical body having a palm seal part is formed by overlapping and heat-bonding so that they are in contact with each other, and a folding part having a V-shaped cross section is provided on both opposite sides of the cylindrical body, and one of the folding parts A side edge thermal bonding portion on the other side edge on one opening side of the one folded portion that is configured such that the palm seal portion is positioned at one side edge of Further, the one opening side corner on the other folding part side is cut into a substantially L shape including the other folding part to form a substantially L-shaped notch, the substantially L shape. The peripheral edge of the notch is thermally bonded in a substantially L shape to provide a substantially L-shaped heat bonding portion, and the one opening A uniaxially stretched film in which the other opening is thermally bonded and sealed at the upper and lower edge thermal adhesive portions, and at least one layer constituting the laminate is stretched in a direction parallel to the upper and lower edge thermal adhesive portions. The joint seal portion and the side end intersected by the tear virtual line when the tear virtual line connecting the joint seal portion and the side edge thermal bonding portion and the L-shaped cutout portion is assumed. It is a gusset type packaging bag in which an opening start means is provided at the edge of the edge thermal bonding part ,
A strip-shaped base from the palm seal portion to the substantially L-shaped thermal bonding portion on the other opening side of the tear imaginary line, or from the side edge thermal bonding portion to the substantially L-shaped thermal bonding portion; A male member having a male occlusal portion projecting in parallel to the base portion, and a female member having a strip-shaped base portion and a female occlusion portion projecting in parallel to the base portion and meshing with the male occlusion portion The side end corresponding to the position where the synthetic resin occlusion device is heat-sealed at the base portion to the position facing the inner layer and the synthetic resin occlusion device is heat-sealed at the base portion. The inner layer of the one folding part on the edge thermal bonding part side or the one folding part on the palm seal part side is heat-sealed at the folding part thermal bonding part .

  The invention according to claim 2 is characterized in that, in the gusset type packaging bag according to claim 1, the opening start means is a notch or a notch.

  Further, the present invention described in claim 3 is the gusset type packaging bag described in claim 1, characterized in that the opening start means is a display section.

  The gusset-type packaging bag of the present invention can be easily opened in a direction perpendicular to the folding part, can obtain an opening having a substantially constant shape, and draws out the folding part on the opened side to the outside to spout And the outstanding effect that the content can be taken out easily is produced. Further, by providing a synthetic resin bite in the opening, the opening can be obtained by opening the bite, and the contents can be easily taken out from the opening and can be resealed. This is an effect.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a perspective view showing a main part of an embodiment of a gusset type packaging bag according to the present invention. FIG. 2 is a perspective view showing a main part of another embodiment of the gusset type packaging bag according to the present invention. FIG. 4 is a diagram schematically showing a state in which the gusset-type packaging bag is opened by tearing from the I notch, and FIG. 4 is one example of a synthetic resin occlusion device attached to the gusset-type packaging bag according to the present invention. FIG. 5 is a diagram schematically showing an embodiment, and FIG. 5 is a diagram schematically showing another embodiment of a synthetic resin bite that is attached to a gusset type packaging bag according to the present invention. Gusset type packaging bag, 2 is an I notch, 3 and 3 'are synthetic resin occlusion devices, 10 is a palm seal part, 11 is a side edge thermal adhesive part, 12 is a substantially L-shaped thermal adhesive part, and 20 is an upper end. Edge heat bonding part, 30 and 30 'are male members, 31, 31' are female members, 301, 311 is a belt-shaped base, 302 is a male occlusion part, 312 is a female occlusion part, 3011 and 3111 are low temperature sealing resin layers, A and B are folding parts, C is a substantially L-shaped notch part, and L is a laminate. , S indicates a heat-bonding portion of the folding portion, and α indicates a tearing imaginary line.

  FIG. 1 is a perspective view of a main part showing an embodiment of a gusset type packaging bag according to the present invention, and the gusset type packaging bag 1 is a rectangular laminate having at least a base material layer and an inner layer made of a heat-adhesive resin. The opposite ends of the body are overlapped so that the inner layers are in contact with each other and thermally bonded to form a cylindrical body having a palm seal portion 10, and a cross-sectional V-shaped cross section is formed on both opposing sides of the cylindrical body. One opening of the folding part A provided with the folding parts A and B and configured so that the palm seal part 10 is located at one side edge of the one folding part A and formed the palm seal part 10 The side edge thermal bonding part 11 is formed on the other side edge on the part side, and the one opening side corner on the other folding part side includes the other folding part B and is substantially L-shaped. A substantially L-shaped cutout portion C is formed by cutting the peripheral edge of the substantially L-shaped cutout portion C into a substantially L shape. And an approximately L-shaped thermal bonding portion 12 is provided, and the one opening is thermally bonded at the upper edge thermal bonding portion 20 and the other opening is bonded at the lower edge thermal bonding portion (not shown). And at least one layer constituting the laminate is a uniaxially stretched film layer stretched in a direction parallel to the upper and lower edge thermal adhesive portions, and the joint seal portion 10 and the side When assuming a tear imaginary line α connecting the edge thermal bonding portion 11 and the L-shaped cutout portion C, the joint seal portion 10 and the side edge thermal bonding portion 11 where the tear imaginary line α intersects I notches 2 and 2 are provided on the edge as opening opening means. In FIG. 1, the side edge thermal bonding portion 11 is provided in a state of being connected to the upper edge thermal bonding portion 20.

  The gusset-type packaging bag 1 configured in this way is excellent in hermeticity and when opened, both I notches 2 provided in the palm seal part 10 and the side edge thermal bonding part 11 of the folding part A, By tearing 2 as an opening start means, the effect of the uniaxially stretched film layer provided on the laminate constituting the packaging bag 1 can be smoothly torn along the tearing virtual line α to obtain a large opening, When taking out the contents, a spout is formed by pulling out the folding part A to the outside, and the contents can be easily taken out from this spout into another container or the like.

  In the embodiment, the side edge thermal bonding part 11 is connected to the upper edge thermal bonding part 20 and extended to the lower edge thermal bonding part (not shown) side by a certain length. The upper edge thermal adhesive portion 20 may be provided separately from the upper edge thermal adhesive portion 20 without being connected to the upper edge thermal adhesive portion 20, or the upper edge thermal adhesive portion 20 and the lower edge thermal adhesive portion may be provided in the same manner as the palm seal portion 10. (Although not shown), the two side edge portions of the folding portion B are formed by folding portions in the embodiment. It may be constituted by a side edge thermal bonding portion having a constant width extending from the letter-shaped thermal bonding portion 12 to the lower edge thermal bonding portion (not shown). Moreover, although it is not shown in figure, it shall be set as the packaging bag which is excellent in the self-supporting appearance by setting it as the gusset type packaging bag which provided the side edge thermal bonding part from an upper end edge to a lower end edge in four side edges. Can do.

  Further, in the examples, the opening opening means has been described as an I notch (cut portion), but it may be a polygonal shape such as a V shape or a cutout portion such as a U shape. It may be a group of scars penetrating the joint seal part 10 and the side edge thermal bonding part 11 provided at the edge of the joint sealing part 10 and the side edge thermal bonding part 11, The display part which shows the opening start part formed by printing or printing may be sufficient.

  FIG. 2 is a perspective view of a principal part showing another embodiment of the gusset type packaging bag according to the present invention, and FIG. 3 is a state in which the gusset type packaging bag of FIG. The gusset type packaging bag 1 ′ is the other opening side of the tearing virtual line α of the gusset type packaging bag 1 shown in FIG. 1 (opposite of the upper edge thermal bonding portion 20). 4 is a male base provided with a belt-like base 301 shown in FIG. 4 and a male occlusal part 302 projecting in parallel to the base 301 from the side edge thermal adhesive part 11 to the substantially L-shaped thermal adhesive part 12. A synthetic resin occlusion device 3 comprising a member 30, a belt-like base portion 311, and a female die member 31 including a female occlusion portion 312 that projects in parallel to the base occlusion portion 302 and the male occlusion portion 302. The male occlusion portion 302 and the female occlusion portion 312 are bitten. In the state where the inner layer is opposed to each other, the base portions 301 and 311 are heat-sealed at the base portions 301 and 311, respectively, and the synthetic resin bite 3 is heat-sealed at the base portions 301 and 311. The inner layers of the one folding part A on the seal part 10 side are heat-sealed at the folding part thermal bonding part S, and the other parts are the same as the gusset type packaging bag 1. In addition, in FIG. 3, the code | symbol L is the laminated body which comprises a gusset type packaging bag.

  The gusset type packaging bag 1 ′ thus configured can be freely opened and closed by the synthetic resin articulating tool 3 in addition to the effects described in the above gusset type packaging bag 1. It can use suitably for the contents to do. Moreover, in the gusset-type packaging bags 1 and 1 ′ shown in FIGS. 1 and 2, the substantially L-shaped cutout portion C and the substantially L-shaped thermal bonding portion 12 are shown in an L shape having right-angled corners. However, it may be substantially L-shaped with the right-angled corners arcuate.

  Next, the laminated body used for the gusset type packaging bag 1, 1 'of this invention is demonstrated. As the base material layer of the laminate used for the gusset packaging bag 1, 1 ′ of the present invention, a synthetic resin film having properties excellent in mechanical, physical, chemical, etc., for example, polyester-based, polyamide-based, polypropylene-based Examples thereof include a stretched film made of a resin such as biaxially stretched, cellophane and paper.

  Moreover, as an inner layer which consists of a thermoadhesive resin of the laminated body used for the gusset packaging bag 1, 1 'of this invention, what is necessary is just a resin layer which can be melt | dissolved by heat and welded mutually, and is requested | required of a packaging bag For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer may be used. In addition to olefin-based resins such as polymers, ethylene-vinyl acetate copolymers, ionomer resins, ethylene-acrylic acid copolymers, ethylene-methyl acrylate copolymers, ethylene-methacrylic acid copolymers, polyesters, polyamides, A resin composed of one or more kinds of resins such as polyacrylonitrile, or a multilayer of the above resins In the case where the synthetic resin occlusion device 3 is provided in the inner layer, the occlusion device 3 is generally made of an olefin resin, and considering this, at least the innermost surface of the inner layer is the above-described one. It is appropriate to use an olefin resin. The inner layer may be a film formed in advance (including a co-extruded film) or may be formed by heat-melt extrusion (including co-extrusion) with a T-die extruder.

  Moreover, as a laminated body used for the gusset packaging bag 1, 1 'of the present invention, a barrier layer for imparting gas barrier properties such as oxygen gas and water vapor gas and / or light-shielding properties as required is an intermediate layer. May be provided between the base layer and the inner layer as described above, for example, a metal foil represented by aluminum foil, or a film of polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, Or a film of polyvinylidene chloride coated on a film of polyolefin such as polyester, polyamide, polyethylene, polypropylene, ethylene-propylene copolymer, or polyvinyl alcohol, or aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide Etc. As the intermediate layer, the packaging bag is provided with functions such as mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, and chemical resistance. Therefore, for example, the reinforcing layer may be a combination of one or more of polyolefins such as polyester, polyamide, polyethylene, polypropylene, and ethylene-propylene copolymer. The reinforcing layer may be in an unstretched state or a stretched state, and the barrier layer and the reinforcing layer may be used in combination depending on the physical properties required for the packaging bag, or may be used alone. It ’s good.

  Moreover, as a laminated body used for the gusset type packaging bag 1, 1 ′ of the present invention, it is sufficient that at least one uniaxially stretched film layer stretched in the direction perpendicular to the longitudinal direction is provided in the layer configuration, The uniaxially stretched film layer is used as the base layer, or the intermediate layer, or a layer between the base layer and the intermediate layer, or the intermediate layer and the inner layer. Whether to use an intermediate layer or to use any two of the uniaxially stretched film layers as described above may be determined appropriately in consideration of the tearability of the laminate. And as a film which forms a uniaxially stretched film layer, it is a film uniaxially stretched in the direction orthogonal to the longitudinal direction (a film having tearability in the transverse direction), and is a well-known uniaxially stretched film made of polyethylene or polypropylene resin For example, Kalarian Y [manufactured by Denki Kagaku Kogyo Co., Ltd .: trade name], YT-42 [manufactured by Toray Film Processing Co., Ltd .: trade name] can be mentioned. Further, in the laminate having the uniaxially stretched film layer described so far, the inner layer is a linear low-density polyethylene and has a relatively weak transverse tear strength, for example, LK410M [manufactured by Tamapoly Co., Ltd. : Product name], a packaging bag having excellent heat seal strength can be obtained, and a packaging bag that is more easily torn in the lateral direction.

  Moreover, as a lamination | stacking method which laminates | stacks each above-mentioned layer to make a laminated body, appropriate lamination | stacking methods, such as the sandwich lamination method laminated | stacked using a T-die extruder, the dry lamination method laminated | stacked using an adhesive agent, etc. are used. What is necessary is just to select and laminate | stack.

  Next, the synthetic resin bite 3 will be described. Examples of the resin used in the synthetic resin bite 3 include, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene- It consists of one or more resins such as propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer. What was shape | molded with resin can be used, and what is necessary is just to manufacture by the well-known extrusion molding method using a metal mold | die as a manufacturing method of the said articulation tool 3. As shown in FIG. If necessary, as shown in FIG. 5, a resin that forms the base 301 and the male occlusal portion 302 on the side to be thermally bonded to the inner layer of the strip-shaped bases 301 and 311, and the base 311 and the female As a synthetic resin occlusion tool 3 ′ composed of a low temperature sealing resin layer 3011 having a lower temperature sealing property than the resin forming the mold occlusion 312 and a male member 30 ′ provided with 3111 and a female member 31 ′. In addition, with this configuration, it is possible to provide an articulating tool 3 ′ that can be more easily thermally bonded to the inner layer.

It is a principal part perspective view which shows one Example of the gusset type packaging bag concerning this invention. It is a principal part perspective view which shows the other Example of the gusset type packaging bag concerning this invention. It is a figure which shows the state which looked at the state which opened the gusset type packaging bag of FIG. 2 from the I notch, and was opened. It is a figure which shows typically one Example of the synthetic resin articulation tool attached to the gusset type packaging bag concerning this invention. It is a figure which shows the other Example of the synthetic resin bite attached to the gusset type packaging bag concerning this invention graphically.

Explanation of symbols

1, 1 'Gusset type packaging bag 2 I notch 3, 3' Synthetic resin bite 10 Joint seal part 11 Side edge thermal adhesive part 12 Substantially L-shaped thermal adhesive part 20 Upper edge thermal adhesive part 30, 30 ' Male member 31, 31 'Female member 301, 311 Band-shaped base 302 Male occlusion portion 312 Female occlusion portion 3011, 3111 Low temperature sealing resin layer A, B Folding portion C Substantially L-shaped notch L Laminate S Folding part thermal bonding part α tear virtual line

Claims (3)

A cylindrical body having a palm seal part by overlapping and heat-bonding opposing edges of a rectangular laminate including at least a base material layer and an inner layer made of a heat-adhesive resin so that the inner layers abut each other; None, a folding portion having a V-shaped cross section is provided on both opposite side portions of the cylindrical body, and the joint seal is configured so that the joint seal portion is positioned at one side edge of the one of the folded portions. A side edge thermal bonding portion is formed on the other side edge of one opening portion of the one folding portion, and the one opening side corner on the other folding portion side is Including the other folded part, it is cut into a substantially L-shape to form a substantially L-shaped notch, and the peripheral edge of the substantially L-shaped notch is thermally bonded to a substantially L-shape to form a substantially L-shaped heat. Provided with an adhesive portion, the one opening and the other opening is thermally bonded and sealed at the upper and lower edge thermal bonding portion, At least one layer constituting the layered body is composed of a uniaxially stretched film layer that is stretched in a direction parallel to the upper and lower edge thermal adhesive portions, and the joint seal portion, the side edge thermal adhesive portion, and the L-shaped notch This is a gusset-type packaging bag in which an opening start means is provided at the edge of the palm seal portion and the side edge thermal bonding portion where the tear imaginary line intersects when the tear imaginary line is connected to the portion. And
A strip-shaped base from the palm seal portion to the substantially L-shaped thermal bonding portion on the other opening side of the tear imaginary line, or from the side edge thermal bonding portion to the substantially L-shaped thermal bonding portion; A male member having a male occlusal portion projecting in parallel to the base portion, and a female member having a strip-shaped base portion and a female occlusion portion projecting in parallel to the base portion and meshing with the male occlusion portion The side end corresponding to the position where the synthetic resin occlusion device is heat-sealed at the base portion to the position facing the inner layer and the synthetic resin occlusion device is heat-sealed at the base portion. The gusset-type packaging bag, wherein the inner layer of the one folding part on the edge thermal bonding part side or the one folding part on the palm seal sealing part side is heat-sealed at the folding part thermal bonding part . The gusset-type packaging bag according to claim 1, wherein the opening start means is a notch or a notch. The gusset-type packaging bag according to claim 1, wherein the opening start means is a display unit.

Images