JP2022020182A - Packaging bag - Google Patents

Abstract

To provide a packaging bag which is made by bag-making a laminated sheet comprising a plurality of material layers, and can be recycled.SOLUTION: A packaging bag 1 is made by bag-making a laminated sheet comprising a plurality of material layers. The laminated sheet 2 includes: a first material layer 21 which comprises a single material which can be recycled; a second material layer 22 which is arranged outside of the first material layer 21, and which is made of another material different from that of the first material layer 21, and has predetermined functionality; and an adhesive layer 23 which adheres the first material layer 21 and the second material layer 22 with separable adhesion strength. Thereby, after use of the packaging bag 1, by separating the second material layer 22 from the first material layer 21, the first material layer 21 and the second material layer 22 can be separated from each other, and recycling of the first material layer 21 can be performed.SELECTED DRAWING: Figure 4

Description

The present invention relates to a packaging bag made by making a laminated sheet in which a plurality of material layers are laminated.

Conventionally, packaging bags such as pouches for storing foods, chemicals, cosmetics, pharmaceuticals, detergents, industrial products and the like have been known. Generally, a packaging bag is made by heat-welding a laminated sheet composed of a plurality of material layers, and a sealant layer for heat-welding is arranged inside and a predetermined functionality is provided on the outside of the sealant layer. A base material layer made of a material having the above is provided, and the sealant layer and the base material layer are adhered to each other in a non-peelable state by an adhesive layer.

For example, as such a packaging bag, Patent Document 1 states that in a packaging bag made of a laminated sheet composed of a base material, an adhesive layer and a sealant layer, the base material is a stretched polyamide film or a stretched polyester film. The sealant layer is composed of a first surface layer, a foamed layer and a second surface layer, and the first surface layer and / or the second surface layer is an ethylene / α-olefin copolymer and the foamed layer. Is a polyolefin resin and has a foaming ratio of 1.1 to 3.0 times, and the laminated sheet has a cloudiness of 90% or more and a total light transmittance of 70% or less. According to this, since it can be easily manufactured with a small amount of material, it is possible to reduce the cost, and it is possible to provide appropriate elasticity, easy opening property, barrier property and impact resistance.

By the way, in recent years, while recycling has attracted attention in various product fields, recycling cannot be ignored even in the above-mentioned packaging bags.

Japanese Unexamined Patent Publication No. 2010-2800072

However, in conventional packaging bags, the inner sealant layer is made of a recyclable material such as polyethylene or polypropylene, while the outer base material layer cannot be recycled such as metal foil or film in order to enhance functionality. In many cases, the sealant layer and the base material layer are bonded in a non-peelable state by the adhesive layer as described above, so that it is difficult to recycle as a whole after use. There was a problem.

Of course, it has been proposed that the packaging bag be made of a single material (monomaterial) laminated sheet that can be recycled. However, if the packaging bag is made of a single material laminated sheet, it has barrier properties and water permeability. , It is difficult to adjust predetermined functionality such as oxygen permeability, and the present situation is that such a single material packaging bag has not been widely applied.

The present invention has been made in view of the above-mentioned problems, and provides a packaging bag made of a laminated sheet composed of a plurality of material layers, which can be recycled. The purpose.

The present invention is a packaging bag made of a laminated sheet in which a plurality of material layers are laminated in order to achieve the above object, and the laminated sheet is made of a single material that can be recycled. A second material layer arranged outside the first material layer and having a predetermined functionality made of a material different from the first material layer, and the first material layer. And an adhesive layer for adhering the second material layer with a peelable adhesive strength.

According to this, after the packaging bag is used, the first material layer and the second material layer can be separated by peeling the second material layer from the first material layer, and the first material layer can be separated. It becomes possible to recycle the material layer. Further, when the second material layer is a reusable material, the second material layer can be recycled separately from the first material layer.

Further, the adhesive layer may adhere the first material layer and the second material layer with an adhesive strength of 0.5 to 8N / 15 mm. According to this, the adhesive state between the first material layer and the second material layer can be reliably maintained when the packaging bag is used, and the first material layer and the second material layer can be reliably maintained after the packaging bag is used. The material layer can be peeled off with a predetermined force.

Further, the adhesive layer may be applied in such a manner that the adhesive is arranged at predetermined intervals along the plane direction of the packaging bag. According to this, the adhesive state between the first material layer and the second material layer can be reliably maintained when the packaging bag is used, and the first material layer and the second material layer can be reliably maintained after the packaging bag is used. The material layer can be peeled off with a predetermined force.

Further, the first material layer may be a sealant layer made of a single material of polyethylene, polypropylene or polyester for heat welding the laminated sheet. According to this, at the time of manufacturing the packaging bag, the sealant layers are heat-welded to each other, so that the packaging bag having a predetermined functionality is made into a bag. Therefore, after the packaging bag is used, the bag-made sealant layer and the second material layer can be separated by peeling the second material layer from the sealant layer as the first material layer. , It becomes possible to recycle the sealant layer made into a bag, which occupies most of the packaging bag.

Further, the sealant layer includes an inner sealant layer provided inside the packaging bag and heat-welded at the time of bag making, and an outer sealant layer provided outside the inner sealant layer and not heat-welded at the time of bag making. The inner sealant layer and the outer sealant layer may be made of a single material of either polyethylene, polypropylene or polyester. According to this, when the packaging bag is used, the thickness and stiffness of the sealant layer as the first material layer can be reinforced. Further, after the packaging bag is used, the sealant layer and the second material layer can be separated by peeling the second material layer from the sealant layer, and the sealant layer can be recycled.

Further, the second material layer is a label layer having a predetermined functionality, and is adhered to the entire surface or a part of the surface of the first material layer with an adhesive strength that can be peeled off via an adhesive layer. May be good. According to this, the label layer can impart predetermined functionality such as barrier property, oxygen permeability, and water vapor permeability to the packaging bag. Further, the functionality of the packaging bag can be locally adjusted by adjusting the portion and the size of the label layer to be adhered to the first material layer. Further, by peeling the label layer from the first material layer after using the packaging bag, the first material layer and the label layer can be separated, and the first material layer can be recycled. Will be.

Further, the first material layer includes a sealant layer provided inside the packaging bag and heat-welded at the time of bag making, and a base material layer provided outside the sealant layer, and the sealant layer and the base material layer are provided. May consist of a single material, either polyethylene, polypropylene or polyester. According to this, when the packaging bag is used, the thickness and stiffness of the first material layer can be reinforced.

Further, it is preferable that the second material layer is provided with a knob for peeling from the first material layer. According to this, after using the packaging bag, the second material layer can be easily and surely peeled off from the first material layer by picking the gripped portion of the second material layer with a finger.

According to the present invention, after the packaging bag is used, the first material layer and the second material layer can be separated by peeling the second material layer from the first material layer. It is possible to recycle the material layer of. Further, when the second material layer is a reusable material, the second material layer can be recycled separately from the first material layer.

It is a perspective view of the packaging bag which concerns on 1st Embodiment. It is an enlarged sectional view of the laminated sheet of the packaging bag of FIG. It is sectional drawing of the laminated sheet when the 2nd material layer is peeled off from the 1st material layer. It is a perspective view of the packaging bag which separated the 1st material layer and the 2nd material layer. It is an enlarged sectional view which shows the modification of the laminated sheet of the packaging bag of FIG. It is a table which shows the sensory evaluation of the adhesive strength of the 1st material layer and the 2nd material layer. It is an enlarged perspective view of the part where the knob part is provided in the packaging bag. It is a front view of the packaging bag which concerns on 2nd Embodiment. It is a front view which shows the modification of the packaging bag of FIG.

<First Embodiment>
The first embodiment of the packaging bag (hereinafter referred to as the present packaging bag 1) according to the present invention will be described with reference to FIGS. 1 to 7.

As shown in FIG. 1, the present packaging bag 1 is a bag filled with a fluid such as shampoo, conditioner, and cosmetic liquid, which is generally called a standing pouch, and a laminated sheet 2 composed of a plurality of material layers is made into a bag. It is composed of a flexible bag body 11 and a rigid spout 12 made of a synthetic resin material.

The bag body 11 is composed of a pair of front and back flat members 111, 111 facing each other, and a single bottom member 112 provided at the bottom of the flat members 111, 111. The enclosed space is filled with fluid.

The flat member 111 is composed of a front-view rectangular laminated sheet 2 whose width in the left-right direction is shorter than the length in the up-down direction, and upper edges, left edges, and right edges are heat-welded to each other. Has been done.

The bottom surface member 112 is composed of a sheet member having a shape corresponding to the lower portion of the flat surface member 111, and the peripheral edge portion is heat-welded to the left side edge portion, the right side edge portion, and the lower edge portion of the flat surface member 111.

The spout 12 includes a spout main body 121 having a through hole penetrating in the axial direction and a cap 122 provided on the upper side of the main body portion 121 to close the through hole, and the lower side surface of the spout main body 121 is flat. It is provided at the center of the upper edge portion of the bag main body 11 by being sandwiched between the members 111 and 111 by a heat seal. The spout 12 is preferably made of a recyclable material, for example, the same material as the first material layer 21 of the laminated sheet 2 described later.

As shown in FIG. 2, the laminated sheet 2 has a first material layer 21 made of a recyclable single material and a predetermined functionality made of a material different from the first material layer 21. It includes a second material layer 22 to be provided, and an adhesive layer 23 for adhering the first material layer 21 and the second material layer 22.

The first material layer 21 is a sealant layer arranged inside the packaging bag 1 and made of a single material of polyethylene, polypropylene or polyester for heat welding the laminated sheet 2. In this embodiment, it is made of linear low density polyethylene (LLDPE). In addition, for example, it may be made of low-density polyethylene (LDPE), medium-density polyethylene (MDPE), unstretched polypropylene (CPP), or the like. Further, if necessary, it may be composed of a plant-derived material or a recycled material. As a result, at the time of manufacturing the packaging bag 1, the first material layers 21 are heat-welded to each other, so that the packaging bag 1 is made into a bag. In this embodiment, the first material layer 21 is formed to have a thickness of 60 to 80 μm.

The second material layer 22 is a base material layer arranged outside the first material layer 21 and made of polyethylene terephthalate. The second material layer 22 includes other polyesters (polybutylene terephthalate, polyethylene naphthalate, etc.), polyolefins (polyethylene, polypropylene, etc.), polyamides (nylon-6, nylon-66, etc.), polyvinyl chloride, polyimide, etc. Alternatively, these copolymers may be made of paper or metal, or two or more of them may be laminated. If necessary, barrier coating or metal vapor deposition may be applied. As a result, the packaging bag 1 can have predetermined functionality such as barrier property, oxygen permeability, and water vapor permeability. In this embodiment, the second material layer 22 is formed to have a thickness of 10 to 100 μm.

The adhesive layer 23 is made of a surface-adhesive adhesive. The adhesive may be either a liquid-curable type or a non-curable type. The adhesive may be either a solvent-free type or a solvent type, but the solvent-free type is preferable from the viewpoint of environmental load. Examples of the solvent-free type include a polyether adhesive, a polyester adhesive, a silicone adhesive, an epoxy adhesive and a urethane adhesive. Examples of the solvent type include rubber-based adhesives, vinyl-based adhesives, silicone-based adhesives, epoxy-based adhesives, phenol-based adhesives, and olefin-based adhesives. Further, the adhesive may be another acrylic adhesive, starch, casein or the like. Further, it may be any of a heat-sensitive adhesive, a pressure-sensitive adhesive, and a cold glue.

The adhesive layer 23 adheres the first material layer 21 and the second material layer 22 with an adhesive strength that can be peeled off over the entire surface, specifically, an adhesive strength of 0.5 to 8N / 15 mm. ing. Here, the unit of "N / 15 mm" indicates the force required to peel off the material layer cut out to a width of 15 mm. As described above, since the adhesive layer 23 adheres the first material layer 21 and the second material layer 22 with an adhesive strength of 0.5 N / 15 mm or more, as shown in FIG. 2, the packaging bag It is possible to reliably maintain the bonded state of the first material layer 21 and the second material layer 22 at the time of use of 1. On the other hand, since the adhesive layer 23 adheres the first material layer 21 and the second material layer 22 with an adhesive strength of 8 N / 15 mm or less, the packaging bag is as shown in FIGS. 3 and 4. After the use of 1, the first material layer 21 and the second material layer 22 can be peeled off by a predetermined force.

Next, a method of recycling the packaging bag 1 will be described with reference to FIGS. 1 to 4.

First, as shown in FIGS. 1 and 2, at the time of manufacturing the packaging bag 1, the first material layer 21 and the second material layer 22 are bonded to each other with a peelable adhesive strength via the adhesive layer 23. The sheet 2 is heat-welded to form a bag. When the packaging bag 1 is used, the first material layer 21 and the second material layer 22 of the laminated sheet 2 are adhered to each other with the above-mentioned predetermined adhesive strength. The second material layer 22 does not peel off from the material layer 21 of 1.

Next, as shown in FIG. 3, after the packaging bag 1 is used, when the peripheral edge portion of the second material layer 22 is pulled outward (in the direction of the arrow in FIG. 3), the first material layer 21 and the peripheral portion are pulled. The adhesive layer 22 is separated at the peripheral edge portion, and the separated portion spreads over the entire laminated sheet 2, so that the second material layer 22 is peeled off from the first material layer 21.

Finally, as shown in FIG. 4, the bag main body 11 made of the first material layer 21 in the bag-made state is collected and recycled. Further, when the second material layer 22 is a reusable material, the second material layer 22 is also recycled separately from the first material layer 21.

When collecting the first material layer 21, as shown in FIG. 4, the mouth plug 12 may be removed from the bag body 11 and collected, or the bag body 11 may be collected with the mouth plug 12 attached. You may. Further, the bag main body 11 may be separated into the flat members 111 and 111 and the bottom member 112 and then collected.

In this way, after the packaging bag 1 is used, the first material layer 21 and the second material layer 22 can be separated by peeling the second material layer 22 from the first material layer 21. , The first material layer 21 can be recycled. Further, when the second material layer 22 is a reusable material, the second material layer 22 can be recycled separately from the first material layer 21.

When the first material layer 21 is a sealant layer made of a single material of polyethylene, polypropylene, or polyester for heat welding the laminated sheet 2, the first material layer 21 is a sealant layer after the use of the packaging bag 1. By peeling the second material layer 22 from the sealant layer as the material layer 21 of 1, the bag-made sealant layer and the second material layer 22 can be separated, and most of the packaging bag 1 is covered. It is possible to recycle the sealed sealant layer that occupies the bag.

Next, a modified example of the first embodiment will be described with reference to FIG.

(Modification 1)
As shown in FIG. 5A, the second material layer 22 is composed of a base material layer 221 made of polyethylene terephthalate and an intermediate layer 222 made of nylon (registered trademark) provided inside the base material layer 221. It is configured.

(Modification 2)
As shown in FIG. 5B, the first material layer 21 is provided inside the packaging bag, and is provided on the inner sealant layer 211 which is heat-welded at the time of bag making and the outer side of the inner sealant layer 211. It is composed of an outer sealant layer 212 as a reinforcing layer that is not heat-welded during bag making. The inner sealant layer 211 and the outer sealant layer 212 are made of a single material of either polyethylene, polypropylene or polyester. For example, the inner sealant layer 211 is made of linear low-density polyethylene, the outer sealant layer 212 is made of stretched polyethylene, and the inner sealant layer 211 and the outer sealant layer 212 are bonded or welded in a non-peelable state.

According to this, when the packaging bag 1 is used, the thickness and stiffness of the sealant layer as the first material layer 21 can be reinforced. Further, after the packaging bag 1 is used, the sealant layer and the second material layer 22 can be separated by peeling the second material layer 22 from the sealant layer, and the sealant layer can be recycled. Become.

On the other hand, the second material layer 22 is composed of a base material layer 221 made of polyethylene terephthalate and an intermediate layer 222 made of nylon (registered trademark) provided inside the base material layer 221 as in the modified example 1. Has been done.

(Modification 3)
As shown in FIG. 5C, the second material layer 22 is composed of a base material layer 223 made of paper and a coating layer 224 made of a water resistant resin provided on the outside of the base material layer 223. There is.

On the other hand, the first material layer 21 is provided inside the packaging bag and is heat-welded at the time of bag making, and the first material layer 21 is provided outside the inner sealant layer 211 and manufactured. It is composed of an outer sealant layer 212 as a reinforcing layer that is not heat-welded at the time of bagging. The inner sealant layer 211 and the outer sealant layer 212 are made of a single material of either polyethylene, polypropylene or polyester. For example, the inner sealant layer 211 is made of linear low-density polyethylene, the outer sealant layer 212 is made of stretched polyethylene, and the inner sealant layer 211 and the outer sealant layer 212 are bonded or welded in a non-peelable state.

In Modifications 2 and 3, the first material layer 21 is composed of two sealant layers, an inner sealant layer 211 and an outer sealant layer 212, but is composed of three or more sealant layers. You may.

Next, the sensory evaluation of the adhesive strength between the first material layer and the second material layer will be described.

Laminated film [PET (polyethylene terephthalate) / AL (aluminum) / NY (nylon (registered trademark)) / LLDPE (linear low density polyethylene)] is made into a flat pouch of 100 mm x 100 mm, and peeled between NY / LLDPE by hand. Then, a sensory evaluation of the ease of peeling was performed. The result of the sensory evaluation of the ease of peeling by the adhesive strength is shown in FIG.

According to the result of this sensory evaluation, when the adhesive strength is 1.6 N / 15 mm and 2.7 N / 15 mm, the resistance is small and it can be easily peeled off (indicated by the symbol ⊚). Further, when the adhesive strength is 3.1 N / 15 mm, although there is resistance, it can be peeled off relatively easily (represented by the symbol 〇). Further, when the adhesive strength is 5.5 N / 15 mm, the resistance is considerable, but the peelability is possible (indicated by the symbol Δ). Further, when the adhesive strength is 8.3 N / 15 mm and 10 N / 15 mm, the resistance is large and peeling is not possible. If the material layer is forcibly peeled off, the base material layer (second material layer 22) will be torn (indicated by the symbol ×). Therefore, it can be seen that the adhesive strength of the adhesive layer 23 is preferably 0.5 to 8 N / 15 mm, more preferably 0.5 to 5 N / 15 mm, and even more preferably 0.5 to 3 N / 15 mm.

As shown in FIG. 7, the laminated sheet 2 is provided with a knob portion 24 for peeling the second material layer 22 from the first material layer 21 at the peripheral edge portion of the second material layer 22. May be good. For example, the knob portion 24 may be provided at a corner portion of the peripheral edge portion as shown in FIG. 7 (a), or may be provided so as to project in a plane direction from the peripheral edge portion as shown in FIG. 7 (b). May be done. According to this, after the packaging bag 1 is used, the second material layer 22 is easily and surely peeled off from the first material layer 21 by picking the gripped portion 24 at the peripheral edge of the laminated sheet 2 with a finger. be able to.

Further, although the adhesive layer 23 is provided with the adhesive on the entire surfaces of the first material layer 21 and the second material layer 22, the adhesive layer 23 may be provided on a part of the surface. For example, the adhesive layer 23 may be applied in such a manner that the adhesive is arranged at predetermined intervals along the plane direction of the packaging bag 1. According to this, the adhesive state between the first material layer 21 and the second material layer 22 can be reliably maintained when the packaging bag 1 is used, and the first material layer can be reliably maintained after the packaging bag 1 is used. The 21 and the second material layer 22 can be peeled off by a predetermined force.

<Second embodiment>
Next, a second embodiment of the packaging bag according to the present invention will be described with reference to FIGS. 8 and 9. In the following, only the configurations different from the above-described embodiment will be described, and the same configurations will be omitted and the same reference numerals will be given.

The second material layer 22 is a label layer 22'having a predetermined functionality, and as shown in FIG. 8, an adhesive layer is formed on the surface of a portion of the first material layer 21 extending from the upper end to the vicinity of the lower end. It is adhered with an adhesive strength that can be peeled off via 23. Examples of the label layer 22' include a metal vapor-deposited film, a polyolefin resin such as polyethylene and polypropylene, and a material such as paper. In this embodiment, the label layer 22'is formed to have a thickness of 15 to 20 μm.

According to this, the label layer 22'can impart predetermined functionality such as barrier property, oxygen permeability, and water vapor permeability to the packaging bag.

The first material layer 21 may be composed of one material layer or may be composed of two or more material layers. For example, the first material layer includes a sealant layer provided inside the packaging bag and heat-welded at the time of bag making, and a base material layer provided outside the sealant layer, and includes a sealant layer and a base material layer. Can consist of a single material, either polyethylene, polypropylene or polyester.

Next, a modified example of the second embodiment will be described with reference to FIG.

(Modification 1)
As shown in FIG. 9A, the label layer 22'as the second material layer 22 can be peeled off from the surface of the central portion in the vertical direction of the first material layer 21 via the adhesive layer 23. It is adhered with adhesive strength. According to this, the functionality in the central portion in the vertical direction of the packaging bag 1 can be improved.

(Modification 2)
As shown in FIG. 9B, the label layer 22'as the second material layer 22 has the adhesive layer 23 on the surface of the portion extending from the upper part of the first material layer 21 to the central portion in the vertical direction. It is adhered with an adhesive strength that can be peeled off through. According to this, it is possible to improve the functionality in the portion extending from the upper part to the central part of the packaging bag 1.

As described above, the functionality of the packaging bag 1 can be locally adjusted by adjusting the portion and size of the label layer 22'to be adhered to the first material layer 21. Further, after the packaging bag 1 is used, the label layer 22'can be separated from the first material layer 21 by peeling the label layer 22'from the first material layer 21, and the first material layer 21 can be separated. Can be recycled.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to those of the illustrated embodiments. Various modifications and modifications can be made to the illustrated embodiments within the same range as the present invention or within the same range.

1 ... Packaging bag 11 ... Bag body 111 ... Flat member 112 ... Bottom member 12 ... Mouth plug 121 ... Mouth plug body 122 ... Cap 2 ... Laminated sheet 21 ... First material layer 22 ... Second material layer 23 ... Adhesive Layer 24 ... Picking part

Claims (8)

It is a packaging bag made by making a laminated sheet in which multiple material layers are laminated.
The laminated sheet has a first material layer made of a recyclable single material, and is arranged outside the first material layer, and has a predetermined function made of a material different from the first material layer. A packaging bag comprising a second material layer having a property and an adhesive layer for adhering the first material layer and the second material layer with a peelable adhesive strength. The packaging bag according to claim 1, wherein the adhesive layer is an adhesive strength of 0.5 to 8 N / 15 mm between the first material layer and the second material layer. The packaging bag according to claim 1 or 2, wherein the adhesive layer is applied in such a manner that the adhesive is arranged at predetermined intervals along the plane direction of the packaging bag. The packaging bag according to any one of claims 1 to 3, wherein the first material layer is a sealant layer made of a single material of polyethylene, polypropylene or polyester for heat welding a laminated sheet. The sealant layer includes an inner sealant layer provided inside the packaging bag and heat-welded at the time of bag making, and an outer sealant layer provided outside the inner sealant layer and not heat-welded at the time of bag making. The packaging bag according to claim 4, wherein the layer and the outer sealant layer are made of a single material of either polyethylene, polypropylene or polyester. The second material layer is a label layer having a predetermined functionality, and is adhered to the entire surface or a part of the surface of the first material layer with a peelable adhesive strength via the adhesive layer. The packaging bag according to any one of claims 1 to 5. The first material layer includes a sealant layer provided inside the packaging bag and heat-welded at the time of bag making, and a base material layer provided outside the sealant layer, and the sealant layer and the base material layer are polyethylene. The packaging bag according to claim 6, which comprises a single material of either polypropylene or polyester. The packaging bag according to any one of claims 1 to 7, wherein the second material layer is provided with a knob for peeling from the first material layer.

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