JP7404731B2 - Laminated body for hand-cut and sealed packaging with a sealant layer containing plant-derived polyethylene - Google Patents

Description

The present invention has at least a base material layer, an adhesive layer 1, a barrier layer, an adhesive layer 2, and a sealant layer, which are laminated in this order, and the sealant layer contains plant-derived low-density polyethylene. It relates to a laminate, a packaging material, and a package for hand-cut and sealed packages, and more specifically, it exhibits excellent productivity, blocking resistance, hand-cut and sealability, and bag breakage resistance, and has a high biomass content. The present invention relates to a laminate, a packaging material, and a package.

In recent years, in order to reduce the burden on the environment, consideration has been given to replacing some of the raw materials for polyethylene resin films such as sealant films from fossil fuel-derived polyethylene with plant-derived polyethylene (Patent Document 1). Plant-derived polyethylene is chemically structurally the same as conventional fossil fuel-derived polyethylene, and is expected to have equivalent physical properties.

However, in reality, a resin film containing plant-derived polyethylene does not exhibit properties equivalent to a resin film consisting only of fossil fuel-derived polyethylene.
In particular, resin films containing plant-derived polyethylene have a high blending ratio of plant-derived polyethylene, and the higher the degree of biomass, the lower the blocking resistance, hand-cutting properties, and drop impact resistance when used as a sealant film. I understand.
Therefore, polyethylene films with a high degree of biomass are unsuitable as sealant films for packaging materials that require blocking resistance, hand-cutting properties, and drop impact resistance, and lack practicality.

Japanese Patent Application Publication No. 2009-155516

The present invention solves the above problems and reduces the burden on the environment by containing plant-derived polyethylene in the sealant layer, while providing excellent productivity, blocking resistance, manual tearing and sealing resistance, and bag breakage resistance. The object of the present invention is to provide a laminate, a packaging material, and a packaging body for packaging materials that provide the following properties.

As a result of various studies, the present inventor found that a laminate having a specific layer structure and containing plant-derived low-density polyethylene in the sealant layer achieves the above object.
The present invention is characterized by the following points.
1. A laminate for a hand-cut and sealed package, comprising at least a base material layer, an adhesive layer 1, a barrier layer, an adhesive layer 2, and a sealant layer, which are laminated in this order,
The adhesive layer 2 and the sealant layer are adjacent to each other, and the sealant layer is the outermost layer on one side of the laminate and contains low-density polyethylene, and the low-density polyethylene is made of plant-derived low-density polyethylene. A laminate for a hand-cut and sealed package, characterized by containing:
2. 1. The laminate as described in 1 above, wherein the adhesive layer 1 and/or the adhesive layer 2 contain a cured product of a thermosetting resin.
3. 2. The laminate as described in 2 above, wherein the cured product is a cured product of a polyol and an isocyanate compound.
4. The method according to any one of 1 to 3 above, wherein the base material layer, adhesive layer 1, barrier layer, adhesive layer 2, and sealant layer are adjacent to each other in this order. , laminate.
5. 5. The laminate according to any one of 1 to 4 above, wherein the barrier layer is one or more selected from the group consisting of metal foil, metal vapor deposited film, and metal oxide film. .
6. 5. The laminate according to any one of 1 to 4 above, wherein the barrier layer is a metal foil.
7. 7. The laminate according to any one of 1 to 6 above, wherein the base layer includes a resin film.
8. 7. The laminate according to any one of items 1 to 6 above, wherein the base layer includes a resin film made of polyester.
9. 9. The laminate according to any one of items 1 to 8 above, wherein the base layer includes a resin film made of recycled polyester or plant-derived polyester.
10. The laminate has a half-cut line for manual cutting and sealing, and the half-cut line penetrates the base material layer and does not penetrate the barrier layer, the adhesive layer 2, and the sealant layer. 10. The laminate according to any one of 1 to 9 above, characterized in that the laminate is formed in a laminate.
11. The laminate has a scar group for manual cutting and sealing, and the scar group is formed so as to penetrate the base material layer and not penetrate the barrier layer, the adhesive layer 2, and the sealant layer. 10. The laminate according to any one of 1 to 9 above, characterized in that:
12. A packaging material produced from the laminate according to any one of items 1 to 11 above.
13. 13. A package, characterized in that it is made from the packaging material described in 12 above.
14. A packaging bag made from the packaging material described in 12 above.

The laminate, packaging material, and packaging body of the present invention contain plant-derived polyethylene and exhibit excellent productivity, blocking resistance, manual tear-sealing property, and bag breakage resistance while reducing the burden on the environment. .
From the viewpoint of carbon neutrality, it is possible to suppress an increase in the amount of CO ₂ in the atmosphere and also contribute to saving on the use of petroleum resources.
Carbon neutral means that even if you burn plants, the amount of CO ₂ emitted during that process is equal to the amount of CO ₂ absorbed by the plants during growth, so it does not affect the increase or decrease in the amount of CO ₂ in the atmosphere. It refers to something that is not there. Therefore, the more plant-derived raw materials are included, the more the amount of CO ₂ can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows an example of the layer structure of the sealant film (single layer) for packaging materials of this invention. FIG. 1 is a schematic cross-sectional view showing an example of the layer structure of a laminate for packaging material of the present invention. FIG. 1 is a front view showing an example of the structure of a refill pouch formed using the packaging material of the present invention.

The present invention will be explained in more detail below.
The resin names used in the present invention are those commonly used in the industry.
In the present invention, density is a value measured in accordance with JIS K 6760 (1981) for a 1 mm thick sheet obtained by press molding at 150°C, and MFR is a value measured in accordance with JIS K 7210 (1995). This is a value measured at a test temperature of 190°C and a test load of 21.18N in accordance with the above.

<Laminated body>
The laminate for a hand-cut and sealed package of the present invention has at least a base material layer, an adhesive layer 1, a barrier layer, an adhesive layer 2, and a sealant layer, which are laminated in this order, and the sealant layer is , is the outermost layer on one side of the laminate.
It is preferable that the adhesive layer 2 and the sealant layer are adjacent to each other, and further, the material layer, the adhesive layer 1, the barrier layer, the adhesive layer 2, and the sealant layer are adjacent to each other in this order.
Furthermore, it is preferable that the laminate has half-cut lines and/or scar groups for manual cutting and sealing. By having these, it is possible to improve the manual tearing and sealing properties of the laminate, packaging materials and packages made from the laminate.

(Base material layer)
The base material layer can include any resin film or sheet depending on the use of the laminate. For example, when applying to refill pouches that hermetically package refillable shampoos, conditioners, foods, etc., it is preferable to have excellent mechanical strength such as tensile strength, bending strength, and impact strength, as well as excellent printability. Biaxially oriented nylon films, biaxially oriented polyester films such as biaxially oriented polyethylene terephthalate films, biaxially oriented polypropylene films, and the like can be suitably used, as well as synthetic paper and the like. These may be used alone or in combination.

Among the above resin films, it is preferable to include a resin film made of polyester, and more preferably a resin film made of recycled polyester and/or plant-derived polyester.
The adhesive strength between the layers can be increased by applying an anchor coating agent to the laminated surface of the base material layer in advance or performing a pretreatment such as corona treatment.

(Adhesive layer 1, 2)
It is preferable that the adhesive layers 1 and 2 contain a cured product of a thermosetting resin. Here, the thermosetting resin is preferably a cured product of a polyol and an isocyanate compound.
The adhesive layers 1 and 2 are preferably formed by a dry lamination method using a thermosetting resin composition containing the thermosetting resin.
Adhesive layer 1 and adhesive layer 2 may have the same composition or different compositions.
The coating amount of adhesive layers 1 and 2 after drying is preferably 1.0 to 5.0 g/m ² .

(barrier layer)
The barrier layer is a layer that imparts gas barrier properties to the laminate, and the barrier layer is preferably adjacent to the adhesive resin layer and bonded to the base material layer via the adhesive resin layer. When adhering, the adhesive strength between the layers can be increased by applying an anchor coating agent to the laminated surface of the barrier layer in advance or performing a pretreatment such as corona treatment.
The barrier layer is preferably one or more selected from the group consisting of metal foil, metal vapor deposited film, and metal oxide film, and among these, metal foil is more preferred.
Examples of the metal foil include aluminum foil, examples of the metal vapor deposited film include aluminum, silicon, etc., and examples of the metal oxide film include aluminum oxide, silicon oxide, and the like.
The above metal vapor deposited film and metal oxide film can also be used in the form of a film with a vapor deposited film deposited on a resin film. As the resin film, biaxially stretched polyethylene terephthalate film, polyacrylonitrile film, ethylene-vinyl alcohol copolymer film, etc. can be used.

(Sealant layer)
In the laminate of the present invention, the sealant layer is the outermost layer on one side of the laminate.
The sealant layer of the laminate of the present invention preferably contains low-density polyethylene, and the low-density polyethylene preferably contains plant-derived low-density polyethylene.

Further, the sealant layer can contain any thermoplastic resin commonly used as a constituent component of sealant films. For example, depending on the purpose, there are various functions such as resins with excellent low-temperature sealing properties, resins with excellent content resistance, resins with excellent adhesive properties, resins that increase the stiffness of the entire film and contribute to thinning of the film, etc. It is possible to select a resin that imparts

The sealant layer may have a multilayer structure of two or more layers having the same or different compositions.
For example, when the outermost surface layer of the sealant layer is the first sealant layer and the layer adjacent to the inside of the first sealant layer is the second sealant layer, the first sealant layer is The second sealant layer preferably contains fuel-derived low-density polyethylene, and the second sealant layer preferably contains plant-derived low-density polyethylene, and the thickness ratio of the second sealant layer/first sealant layer is 3/7. Above, it is preferable that it is 7/3 or less.
Moreover, it is preferable that the first sealant layer does not contain a plant-derived low-density polyethylene resin.

The sealant layer may have a third sealant layer or the like further inside, but it must have a two-layer structure consisting only of the first sealant layer and the second sealant layer adjacent to the barrier layer. is preferred.
The total thickness of the sealant layer is preferably in the range of 25 μm or more and 40 μm or less. When it is smaller than the above range, the reduction in environmental load is small, and when it is larger than the above range, the hand-cutting properties and drop impact resistance of the sealant film tend to deteriorate.
The biomass degree of the sealant layer is preferably 10% or more and 50% or less.
If it is smaller than the above range, the biomass degree of the laminate will be low, and the environmental load reduction effect will likely be low.
Examples of the method for laminating the sealant layer include a method of laminating a barrier layer and a sealant film for the sealant layer by a dry lamination method using an adhesive for the adhesive layer 2. The adhesive for adhesive layer 2 may be applied and dried on either side of the barrier layer or the sealant film.

The sealant layer may contain any additives as long as the effects of the present invention are not significantly impaired. Additives include various resin additives that are commonly used to adjust moldability, productivity, and various physical properties of resin films, such as anti-blocking agents, slip agents, antioxidants, pigments, and flow control agents. materials, flame retardants, fillers, ultraviolet absorbers, surfactants, etc.
The sealant layer can be formed from a polyethylene resin composition containing the above-mentioned polyethylene resin, thermoplastic resin, additives, and the like.

(half cut line)
The half-cut line can be formed by processing with a known laser or cutter.
The half-cut line is formed so as to pass through the base material layer but not through the barrier layer, the adhesive layer 2, and the sealant layer. The adhesive layer 1 may or may not be penetrating, depending on the method of processing the half-cut line. For example, when processing with a laser, it may be penetrating, but when processing with a cutter or the like, it does not need to be penetrating.
When the laminate has a half-cut line, the laminate and the packaging material and package made from the laminate have improved manual tear-sealability.
The number of half-cut lines is not particularly limited, and may be one, two or more.
When there are two or more half-cut lines, the half-cut lines may be parallel or convergent, or they may be arranged in a diagonal direction diagonally intersecting a plurality of parallel half-cut lines. The arrangement may be a combination of half-cut lines.

(scar group)
The scar group can be formed by processing with a known laser or cutter.
The scar group is formed so as to penetrate through the base material layer but not through the barrier layer, the adhesive layer 2, and the sealant layer. The adhesive layer 1 may or may not be penetrating, depending on the method of processing the scar group. For example, when processing with a laser, it may be penetrating, but when processing with a cutter or the like, it does not need to be penetrating.
By having the scar group in the laminate, the laminate and packaging materials and packages made from the laminate have improved manual tear-sealability.
There are no particular restrictions on the pattern or width of the scar group, or the shape or number of scars.

[Polyethylene resin]
Polyethylene is classified into fossil fuel-derived polyethylene resins and plant-derived polyethylene resins, depending on the raw material from which it is derived, and is also classified into linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE), depending on its molecular structure, density, and MFR. )are categorized. Further, as linear low density polyethylene, there are C4 linear low density polyethylene (C4LLDPE) and C6 linear low density polyethylene (C6LLDPE).
That is, for example, plant-derived polyethylene resins include plant-derived C4 linear low-density polyethylene, plant-derived C6 linear low-density polyethylene, and plant-derived low-density polyethylene.

Catalysts for polymerization include single-site catalysts such as metallocene catalysts and multi-site catalysts such as Ziegler-Natta catalysts. , a polyethylene with excellent sealing properties and a good balance between physical properties and moldability can be obtained, and in the case of a multisite catalyst such as a Ziegler-Natta catalyst, a polyethylene with excellent mechanical properties can be obtained.
Furthermore, in the present invention, copolymers of ethylene and various unsaturated compounds are also treated as a type of polyethylene.
Furthermore, in the present invention, "resin" is added as a generic term for various types of polyethylene, and for example, polyethylene resin is also written as a generic term for various polyethylenes.

(Fossil fuel-derived polyethylene resin)
In the present invention, fossil fuel-derived polyethylene resins refer to ethylene and α-olefins (1-butene, 1-hexene, Polyethylene is produced by polymerizing raw materials such as
As a polymerization method, a high-pressure method is generally used for low-density polyethylene, and a high-pressure method, a slurry method, a solution method, a gas phase polymerization method, etc. are generally used for linear low-density polyethylene.

(Plant-derived polyethylene resin)
In the present invention, "plant-derived" means containing carbon derived from plant raw materials, which is produced from alcohol obtained using plants as raw materials.
The plant-derived polyethylene resin can be selected to have an appropriate density and MFR depending on the physical properties of the petroleum-derived polyethylene resin used together and the application of the sealant film.

The method for producing plant-derived polyethylene is to produce bioethanol by fermenting sugar solution and starch obtained from plants such as sugar cane, corn, and sweet potatoes using microorganisms such as yeast, and then fermenting this in the presence of a catalyst. Ethylene and α-olefins (1-butene, 1-hexene, etc.) are obtained through intramolecular dehydration reaction and the like. Next, by using these as monomers and polymerizing them in the presence of a conventional catalyst in the same manner as in the production of petroleum-derived polyethylene, a plant-derived polyethylene resin can be produced. In some cases, petroleum-derived α-olefins can also be used as the comonomer species.
The catalyst and polymerization method during polymerization are the same as those for fossil fuel-derived polyethylene resins.

(low density polyethylene)
Low density polyethylene is polyethylene that is radically polymerized under high pressure of 100 to 400 MPa.
The low density polyethylene used in the present invention preferably has a density of 0.920 kg/m ³ or more and 0.933 kg/m ³ or less, and preferably has a density of 0.920 kg/m ³ or more and 0.925 kg/m ³ or less. It is more preferable that there be. The MFR is preferably 0.5 g/10 minutes or more and 3.5 g/10 minutes or less, more preferably 0.8 g/10 minutes or more and 3.0 g/10 minutes or less.

(Linear low density polyethylene)
Linear low-density polyethylene is polyethylene in which ethylene and α-olefin are polymerized under a low pressure of normal pressure to 1 MPa using a transition metal catalyst such as a Ziegler catalyst or a metallocene catalyst.
In the present invention, the linear low density polyethylene may include C4 linear low density polyethylene and/or C6 linear low density polyethylene.
Here, C4 linear low-density polyethylene is a linear low-density polyethylene made of a copolymer of ethylene and 1-butene, and C6 linear low-density polyethylene is a copolymer of ethylene and 1-hexene. It is a linear low-density polyethylene made of a copolymer.
Among these linear low-density polyethylenes, one synthesized using a Ziegler-Natta catalyst is preferable because it has excellent hand cutability and tearability when included in the sealant layer.

(Biomass degree)
Carbon dioxide in the atmosphere contains C14 at a certain rate (105.5 pMC), so the C14 content in plants that grow by taking in atmospheric carbon dioxide, such as corn, is also around 105.5 pMC. It is known. It is also known that fossil fuels contain almost no C14.
Therefore, by measuring the proportion of C14 contained in all carbon atoms in PET, the proportion of carbon derived from biomass can be calculated. In the present invention, "biomass degree" indicates the weight ratio of biomass-derived components.
Taking PET as an example, PET is made by polymerizing ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms at a molar ratio of 1:1, and only biomass-derived ethylene glycol was used. In this case, since the weight ratio of the biomass-derived component in the polyester is 31.25%, the theoretical value of the degree of biomass is 31.25%.
Specifically, the mass of PET is 192, of which the mass derived from biomass-derived ethylene glycol is 60, so 60÷192×100=31.25.

<Packaging materials>
The packaging material of the present invention is a packaging material produced using the laminate of the present invention.

<Package>
The packaging body of the present invention is a packaging body produced using the packaging material of the present invention, for example, by using the packaging material of the present invention and folding it in half, or by preparing two packaging materials. , overlap the sealant layers with their surfaces facing each other, and then seal the peripheral edges of the sealant layer, for example, side seal type, two side seal type, three side seal type, four side seal type, envelope sticker type, gassho sticker type (pillow sticker type). Various types of packaging bags can be manufactured by heat sealing using heat sealing methods such as a sealed type), a pleated seal type, a flat bottom seal type, a square bottom seal type, and a gusset type.

The packaging body of the present invention has a high degree of biomass and exhibits excellent hand-cutting properties and drop impact resistance, so it is particularly useful as a sealant for refill pouches for hermetically packaging refillable shampoos, conditioners, foods, etc. It can be suitably used as a film.
In the above, the heat sealing method can be performed by, for example, a known method such as bar sealing, rotating roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, or the like.

FIG. 3 is a front view showing an example of the structure of a refill pouch, which is one embodiment of the package.
The refill pouch 100 shown in FIG. 3 is manufactured in the form of a standing pouch, and the bottom of the pouch is placed between the lower parts of the front and rear wall films 11 and 11' made of the packaging material of the present invention. The material may be the same as or different from the wall film) is folded inward and inserted up to the bottom film folded part 12 to form a gusset part 14, and both sides of the bottom film folded inward are formed. In this case, semicircular bottom film notches 13a and 13b are provided near the lower end, and the gusset portion 14 is heated with a boat bottom-shaped bottom seal portion 15 whose inner side is concave in a curved line from both sides to the center. The body of the pouch is formed by heat-sealing the edges of both sides of the front and rear wall films 11 and 11' with side seal parts 16a and 16b, and the body of the pouch is formed by heat-sealing the edges of both sides of the front and rear wall films 11 and 11' with the side seal parts 16a and 16b. In the corner part (the left corner part in the figure), there is a narrow spout part 20 with a tapered shape and a narrow width that faces diagonally outward and upward, the outer periphery of which is heat-sealed with a spout seal part 17, and a notch on both sides of the spout part 20. It is provided with portions 19a and 19b in a protruding shape.

Further, at the opening position on the tip side of the spout portion 20, a half-cut line 21 and a notch 22 are provided at the upper end thereof as easy-opening means.
Note that the part of the upper part of the pouch 100 where the spout part 20 is not provided is heat-sealed with the upper seal part 18, but since this part is used as the filling opening for the contents, it should not be left unfilled before filling the contents. This is the opening of the seal and is heat-sealed after filling with the contents.
In addition, the half-cut line 21 is shown as three parallel half-cut lines in the figure, but in addition to one or two, there may be multiple lines such as one to three on each side of the center half-cut line. Any shape such as parallel half-cut lines, a shape that converges on a central half-cut line, or a combination of multiple parallel half-cut lines and diagonal half-cut lines that diagonally intersect with the half-cut lines, etc. It can be provided in any shape.
The present invention will be explained in more detail below by giving Examples and Comparative Examples.

The raw materials used in the examples are as follows.
- Aluminum foil 1: A1N30H-O manufactured by Nippon Seifuku Co., Ltd. Thickness: 7μm.
- Plant-derived ethylene glycol 1: Manufactured by India Glycol. 100% biomass.
- Plant-derived LDPE1: SBC818 manufactured by Braskem. Density: 0.918 kg/m ³ , MFR: 8.1 g/10 min.
・Fossil fuel-derived LDPE 1: High-pressure low-density polyethylene manufactured by Ube Maruzen Polyethylene Co., Ltd., UBE polyethylene F224N. Density: 0.924 g/cm ³ , MFR: 2.0 g/10 minutes.
-DL adhesive 1: Polyol/isocyanate adhesive. For dry lamination method. Thermosetting.
- Slip agent 1: M425 manufactured by Ube Maruzen Polyethylene Co., Ltd. Mass ratio of erucic acid amide/LDPE=2/98.

[Preparation of plant-derived PET film 1]
A film was formed using plant-derived polyethylene terephthalate (PET) synthesized from fossil fuel-derived terephthalic acid and plant-derived ethylene glycol 1, and biaxially stretched to obtain a 12 μm thick plant-derived PET film 1. The biomass content based on radiocarbon ( ¹⁴ C) measurements is 13%.

[Production of sealant films 1 to 10]
A polyethylene resin composition was prepared by blending and melt-mixing the raw materials according to the formulation shown in Table 1, and a film was formed to a thickness of 25 to 55 μm using a top-blown air-cooled inflation coextrusion film forming machine to form a sealant film 1 to 10. I got it.

[Example 1]
A plant-derived PET film 1 as a base material layer and an aluminum foil 1 as a barrier layer are adhered by a dry lamination method using DL adhesive 1 as an adhesive for the adhesive layer 1, and then the aluminum foil 1 side and the sealant film 1 were adhered to each other by a dry lamination method using DL adhesive 1 as an adhesive for the adhesive layer 2 to obtain a laminate.
At this time, the coating amount of the DL adhesive 1 after drying was 4.0 g/m ² .
Various evaluations were performed using the obtained laminate. The structure of the laminate and the evaluation results are shown in Table 2.

[Examples 2 to 6, Comparative Examples 1 to 3]
A laminate was obtained in the same manner as in Example 1, except that the sealant film 1 for the sealant layer was changed to one shown in Table 1, and evaluated in the same manner. The structure of the laminate and the evaluation results are shown in Table 2.
[Comparative example 4]
After applying an anchor coat layer made of a polyurethane resin, which is a cured product of polyol and an isocyanate compound, to the plant-derived PET film 1 as a base material layer so that the coating amount after drying is 0.2 g/m ² , a sandwich layer is formed. Using a lamination method, the surface of the anchor coat layer of the plant-based PET film 1 was bonded to the aluminum foil 1 as a barrier layer via the plant-based LDPE 1.
At this time, the thickness of the plant-derived LDPE1 was 15 μm. Next, a polyethylene resin composition was extruded onto the surface of the aluminum foil 1 using an extrusion coating method to a thickness of 40 μm to obtain a laminate. At this time, the polyethylene resin composition had the same composition as the sealant film 2.
The structure of the laminate and the evaluation results are shown in Table 2.

<Summary of evaluation results>
All Examples had better environmental suitability than Comparative Examples 1 to 4, and also showed an equal or better balance between bag breakage resistance and hand-opening sealability.

<Evaluation method>
[Bag resistance]
Fill each of the 10 pouch bags with 360 ml of water and drop them vertically (bottom down) 10 times and horizontally (surface down) 10 times from a height of 1.2 m to remove breakage, especially at cut points and scar groups. The bags and seals were checked to see if they had receded. Evaluation was made at room temperature (25°C) and low temperature (3°C). The meaning of the result notation is as follows.
Judgment Criteria ◎: No bag breakage or seal regression was observed.
○: Seal regression was observed very rarely.
△: Seal regression was observed.
×: Bag breakage was observed.

[Manual incision and sealability]
Ten pouches were opened from the notch along the half-cut line, and the presence or absence of any snags and stretch of the sealant film at the start of opening was checked. The evaluation was carried out by 5 people who divided the evaluation into two parts each.
Judgment Criteria ◎: Initial opening is smooth, with no catching or stretching of the sealant ○: Compared to ◎, there is slight catching or a slight stretching of the sealant.
△: There is a catch or there is expansion of the sealant.
×: Initial opening is difficult, there is severe catching or sealant stretching

1 Laminated body 2 Base material layer 3a Adhesive layer 1
3b Adhesive layer 2
4 Barrier layer 5 Sealant layer 6 Resin film 11, 11' Wall film 12 Bottom film folded part 13a, 13b Bottom film cutout part 14 Gusset part 15 Bottom seal part 16a, 16b Side seal part 17 Spout part seal part 18 Upper part Seal parts 19a, 19b Notch part 20 Spout part 21 Half cut line 22 Notch 100 Refill packaging bag (pouch)

Claims (9)

A laminate for a hand-cut and sealed package, comprising at least a base material layer, an adhesive layer 1, a barrier layer, an adhesive layer 2, and a sealant layer, which are laminated in this order,
the adhesive layer 2 and the sealant layer are adjacent;
The sealant layer is the outermost layer on one side of the laminate and contains low density polyethylene,
The total thickness of the sealant layer is 30 μm or more and less than 40 μm,
The low density polyethylene contains plant-derived low density polyethylene,
The density is 0.920 kg/m ³ or more and 0.925 kg/m ³ or less, and the MFR is 0.8 g/10 minutes or more and 3.0 g/10 minutes or less,
The base material layer includes a resin film made of any one of polypropylene, polyester, recycled polyester, and plant-derived polyester,
The barrier layer is one or more selected from the group consisting of metal foil, metal vapor deposition film, and metal oxide film,
The sealant layer has a multilayer structure including a first sealant layer that is the outermost surface layer among the sealant layers, and a second sealant layer adjacent to the inside of the first sealant layer,
The first sealant layer contains fossil fuel-derived low-density polyethylene and does not contain plant-derived low-density polyethylene,
The second sealant layer includes plant-derived low density polyethylene,
The total thickness of the sealant layer is 30 μm or more and less than 40 μm,
The thickness ratio of the second sealant layer/the first sealant layer is 3/7 or more and 7/3 or less,
A laminate for hand-cut and sealed packages. The laminate according to claim 1, wherein the adhesive layer 1 and/or the adhesive layer 2 contain a cured product of a thermosetting resin. The laminate according to claim 2, wherein the cured product is a cured product of a polyol and an isocyanate compound. The base material layer, the adhesive layer 1, the barrier layer, the adhesive layer 2, and the sealant layer,
The laminate according to any one of claims 1 to 3, characterized in that the laminate is adjacent in this order. The laminate has a half-cut line for manual opening and sealing,
The half-cut line is characterized in that it is formed so as to penetrate the base material layer and not to penetrate the barrier layer, the adhesive layer 2, and the sealant layer.
The laminate according to any one of claims 1 to 4. The laminate has a group of scars for manual cutting and sealing,
The scar group is characterized in that it is formed so as to penetrate the base material layer and not penetrate the barrier layer, the adhesive layer 2, and the sealant layer.
The laminate according to any one of claims 1 to 4. A packaging material produced from the laminate according to any one of claims 1 to 6. A package made from the packaging material according to claim 7. A packaging bag made from the packaging material according to claim 7.

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