JP2020055303A - Laminate for hand-cut opening package having sealant layer containing plant-derived polyethylene - Google Patents

Abstract

To provide a laminate for a packaging material giving excellent productivity, anti-blocking property, hand-cut opening property, and anti-bag-breaking property while reducing environmental load by having plant-derived polyethylene contained in a sealant layer, a packaging material, and a package.SOLUTION: The laminate for a hand-cut opening package includes: at least a substrate layer (2); an adhesive layer 1(3a); a barrier layer (4); an adhesive layer 2(3b); and a sealant layer (5) laminated in this order, where the adhesive layer 2(3b) and the sealant layer (5) are contiguous, the sealant layer (5) is an outermost layer of one surface of the laminate which contains low density polyethylene, and the low density polyethylene contains plant-derived low density polyethylene.SELECTED DRAWING: Figure 1

Description

  The present invention has at least a substrate 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 a plant-derived low-density polyethylene. The present invention relates to a laminate, a packaging material, and a package for a hand-cut open package. More specifically, it shows excellent productivity, blocking resistance, hand-open resistance, and bag-break resistance, and has a high biomass degree. , A packaging material and a package.

  In recent years, in order to reduce the burden on the environment, it has been studied to replace a part of raw materials of a polyethylene resin film such as a sealant film from fossil fuel-derived polyethylene with plant-derived polyethylene (Patent Document 1). Plant-derived polyethylene is expected to have the same physical properties as conventional fossil fuel-derived polyethylene without change in chemical structure.

However, in practice, a resin film containing a plant-derived polyethylene does not exhibit properties equivalent to those of a resin film composed of only a fossil fuel-derived polyethylene.
In particular, the resin film containing the plant-derived polyethylene has a high blending ratio of the plant-derived polyethylene, and as the biomass degree increases, the blocking resistance, hand-cutting property, and drop impact resistance when used as a sealant film are reduced. I understood.
Therefore, a polyethylene film having a high biomass degree is unsuitable as a sealant film for a packaging material that requires blocking resistance, hand-cutting property, and drop impact resistance, and lacks practicality.

JP 2009-155516 A

  The present invention solves the above problems, and comprises a plant-derived polyethylene in a sealant layer to reduce the load on the environment, while providing excellent productivity, blocking resistance, hand-opening resistance, and bag-break resistance. It is an object of the present invention to provide a laminate, a packaging material, and a packaging material for a packaging material that provide the following.

As a result of various studies, the present inventors have found that a laminate having a specific layer structure and containing a plant-derived low-density polyethylene in a sealant layer achieves the above object.
And this invention is characterized by the following points.
1. A laminate for a hand-cut open package having at least a substrate 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 a plant-derived low-density polyethylene. A laminate for a hand-cut open package, characterized by containing.
2. The laminate according to the above item 1, wherein the adhesive layer 1 and / or the adhesive layer 2 contains a cured product of a thermosetting resin.
3. 3. The laminate according to the above item 2, wherein the cured product is a cured product of a polyol and an isocyanate compound.
4. The base 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. The laminate.
5. The laminate according to any one of the above items 1 to 4, wherein the barrier layer is one kind or two or more kinds selected from the group consisting of a metal foil, a metal deposition film, and a metal oxide film. .
6. The laminate according to any one of the above items 1 to 4, wherein the barrier layer is a metal foil.
7. The laminate according to any one of the above items 1 to 6, wherein the base material layer includes a resin film.
8. The laminate according to any one of the above 1 to 6, wherein the base material layer includes a resin film made of polyester.
9. The laminate according to any one of the above items 1 to 8, wherein the base material layer includes a resin film made of recycled polyester or plant-derived polyester.
10. The laminate has a half-cut line for hand cutting and opening, 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. The laminate according to any one of the above 1 to 9, wherein the laminate is formed as follows.
11. The laminate has a group of scars for hand cutting and opening, 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 the above items 1 to 9, wherein
12. A packaging material produced from the laminate according to any one of 1 to 11 above.
13. 13. A package produced from the packaging material described in 12 above.
14． 13. A packaging bag produced from the packaging material described in 12 above.

The laminate, packaging material, and package of the present invention show excellent productivity, blocking resistance, hand-opening resistance, and bag-breaking resistance while containing a plant-derived polyethylene and reducing the load on the environment. .
Then, from the viewpoint of carbon neutrality, it is possible to suppress an increase in the amount of CO _{2 in} the atmosphere and to contribute to saving petroleum resources.
Note that the carbon neutral, even burning plant, the amount of CO ₂ is discharged to occasion, since equal amount of CO ₂ plants absorbed during growth, it affects the increase or decrease of the amount of CO ₂ in the atmosphere Point out that there is no Therefore, the more the plant-derived raw material is contained, the more the increase in the amount of CO ₂ can be suppressed.

It is a schematic sectional drawing which shows an example about the layer structure of the sealant film (single layer) for packaging materials of this invention. It is a schematic sectional drawing which shows an example about the layer structure of the laminated body for packaging materials of this invention. It is a front view showing an example about the composition of the refill pouch formed using the packaging material of the present invention.

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

<Laminate>
The laminate for a hand-cut open package of the present invention has at least a substrate layer, an adhesive layer 1, a barrier layer, an adhesive layer 2, and a sealant layer, and is laminated in this order. Is the outermost layer on one side of the laminate.
The adhesive layer 2 and the sealant layer are adjacent to each other, and it is preferable that 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.
Further, it is preferable that the laminate has a half-cut line and / or a scar group for hand cutting and opening. By having these, it is possible to improve the hand-openability of the laminate, the packaging material produced from the laminate, and the package.

(Base material layer)
The base material layer can include any resin film or sheet depending on the use of the laminate. For example, when applied to refill shampoos and rinses, refill pouches for sealing and packaging food, etc., it is excellent in mechanical strength such as tensile strength, flexural strength, impact strength, and preferably excellent in printability, for example, A biaxially stretched polyester film such as a biaxially stretched nylon film or a biaxially stretched polyethylene terephthalate film, a biaxially stretched polypropylene film, or the like can be suitably used, and a synthetic paper can also be used. These may be used alone or in combination of two or more.

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

(Adhesive layers 1, 2)
The adhesive layers 1 and 2 preferably 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.
The adhesive layer 1 and the adhesive layer 2 may have the same composition or different compositions.
The coating amount of the 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 it is preferable that the barrier layer is adjacent to the adhesive resin layer and is bonded to the base material layer via the adhesive resin layer. At the time of bonding, the adhesive strength between the layers can be increased by applying an anchor coat agent on the lamination surface of the barrier layer in advance or performing a pretreatment such as a corona treatment.
The barrier layer is preferably one or two or more selected from the group consisting of a metal foil, a metal deposition film, and a metal oxide film, and among these, a metal foil is more preferable.
Examples of the metal foil include an aluminum foil, examples of the metal deposition film include aluminum and silicon, and examples of the metal oxide film include aluminum oxide and silicon oxide.
The above-described metal vapor-deposited film and metal oxide film can be used in the form of a film with a vapor-deposited film deposited on a resin film. As the resin film, a biaxially stretched polyethylene terephthalate film, a polyacrylonitrile film, an ethylene-vinyl alcohol copolymer film, or the like 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 may contain any thermoplastic resin generally used as a component of the sealant film. For example, depending on the purpose, various functions such as a resin having excellent low-temperature sealing properties, a resin having excellent content resistance, a resin having excellent adhesiveness, and a resin contributing to thinning the film by increasing the stiffness of the entire film. Can be selected.

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 in the sealant layer is a first sealant layer, and a layer adjacent to the inside of the first sealant layer is a second sealant layer, the first sealant layer is a fossil fossil. Preferably, the fuel-derived low-density polyethylene is included. The second sealant layer preferably includes a plant-derived low-density polyethylene. The thickness ratio of the second sealant layer / the first sealant layer is 3/7. As mentioned above, it is preferable that it is 7/3 or less.
Further, 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 has a two-layer structure composed of only 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 a range from 25 μm to 40 μm. If it is smaller than the above range, the reduction of the environmental load is small, and if it is larger than the above range, the hand-cutting property and the drop impact resistance of the sealant film tend to be reduced.
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 degree of biomass of the laminate becomes low, and the effect of reducing the environmental load tends to be low.
Examples of the method of laminating the sealant layer include a method of laminating the barrier layer and the sealant film for the sealant layer by a dry lamination method using an adhesive for the adhesive layer 2. The adhesive for the adhesive layer 2 may be applied to either the barrier layer or the sealant film and dried.

The sealant layer may contain any additive as long as the effect of the present invention is not significantly impaired. Examples of the additives include various resin additives generally used for adjusting molding processability and productivity of resin films and various physical properties, such as anti-blocking agents, slip agents, antioxidants, pigments, and flow control. Materials, flame retardants, fillers, ultraviolet absorbers, surfactants and the like.
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 penetrate the base material layer but not to penetrate the barrier layer, the adhesive layer 2, and the sealant layer. The adhesive layer 1 may or may not penetrate, and depends on the processing method of the half-cut line. For example, it may be penetrated when processing with a laser, but may not be penetrated when processing with a cutter or the like.
When the laminate has the half-cut line, the laminate and the packaging material and the package produced from the laminate have improved hand-cut openability.
The number of half-cut lines is not particularly limited, and may be one or two or more.
When there are two or more half-cut lines, the half-cut lines may be parallel or converged, or may be a plurality of parallel half-cut lines and a diagonal direction obliquely intersecting the same. May be arranged in combination with the half-cut line.

(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 the base material layer but not to penetrate the barrier layer, the adhesive layer 2, and the sealant layer. The adhesive layer 1 may or may not penetrate, and varies depending on the method of processing the scar group. For example, it may be penetrated when processing with a laser, but may not be penetrated when processing with a cutter or the like.
When the laminate has the scar group, the laminate and the packaging material and the package produced from the laminate have improved hand-cut openability.
There is no particular limitation on the pattern and width of the scar group, and the shape and number of the scars.

[Polyethylene resin]
Polyethylene is classified into fossil fuel-derived polyethylene resin and plant-derived polyethylene resin according to the raw materials from which it is derived, and linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE) according to its molecular structure, density, and MFR. )are categorized. Further, as the 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.

Examples of the catalyst at the time of polymerization include a single-site catalyst such as a metallocene catalyst or a multi-site catalyst such as a Ziegler-Natta catalyst, and in the case of a single-site catalyst such as a metallocene catalyst, structural uniformity, strength, and transparency. In addition, a polyethylene having excellent sealing properties and an excellent balance between physical properties and moldability can be obtained. In the case of a multi-site catalyst such as a Ziegler-Natta catalyst, a polyethylene having excellent mechanical properties can be obtained.
In the present invention, a copolymer of ethylene and various unsaturated compounds is also treated as a kind of polyethylene.
Further, in the present invention, “system resin” is added as a general term for various kinds, and for example, polyethylene resin is also described as a general term for various kinds of polyethylene.

(Polyethylene resin derived from fossil fuel)
In the present invention, fossil fuel-derived polyethylene-based resin refers to ethylene obtained by thermally decomposing naphtha obtained from petroleum without using plant-derived raw materials, and α-olefins (1-butene, 1-hexene). Etc.) as a raw material.
As the 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 and the like are generally used for linear low-density polyethylene.

(Plant-derived polyethylene resin)
In the present invention, the term "plant-derived" means containing carbon derived from plant raw materials, which is produced from alcohol obtained from plants.
As the plant-based polyethylene resin, a resin having an appropriate density and MFR can be selected according to the physical properties of the petroleum-derived polyethylene resin used in combination and the use of the sealant film.

As a method for producing plant-derived polyethylene, according to a conventional method, a sugar solution or starch obtained from a plant such as sugarcane, corn, sweet potato, or the like is fermented by a microorganism such as yeast to produce bioethanol, which is used as a catalyst. Then, ethylene and an α-olefin (1-butene, 1-hexene, etc.) are obtained by an intramolecular dehydration reaction or the like. Then, by using these as monomers and polymerizing in the presence of a conventional catalyst in the same manner as in the production of petroleum-derived polyethylene, a plant-derived polyethylene-based resin can be produced. As the α-olefin which is a comonomer species, a petroleum-derived one may be used in some cases.
The catalyst and the polymerization method at the time of polymerization are the same as those of the polyethylene resin derived from fossil fuel.

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

(Linear low density polyethylene)
Linear low-density polyethylene is a polyethylene in which ethylene and an 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, the C4 linear low-density polyethylene is a linear low-density polyethylene composed of a copolymer of ethylene and 1-butene, and the C6 linear low-density polyethylene is a copolymer of ethylene and 1-hexene. It is a linear low-density polyethylene made of a copolymer.
These linear low-density polyethylenes synthesized using a Ziegler-Natta catalyst are excellent in hand-cutting properties and tearing properties when contained in a sealant layer, and are therefore preferable.

(Biomass degree)
Since carbon dioxide in the atmosphere contains C14 at a fixed ratio (105.5 pMC), plants that take in carbon dioxide in the atmosphere and grow, for example, corn, also have a C14 content of about 105.5 pMC. It is known. It is also known that C14 is hardly contained in fossil fuels.
Therefore, by measuring the ratio of C14 contained in all carbon atoms in PET, the ratio of carbon derived from biomass can be calculated. In the present invention, the “degree of biomass” indicates a weight ratio of a biomass-derived component.
Taking PET as an example, PET is obtained by polymerizing ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms in a molar ratio of 1: 1. Only ethylene glycol derived from biomass 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 biomass degree is 31.25%.
Specifically, since the mass of PET is 192, and the mass derived from ethylene glycol derived from biomass is 60, 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 package of the present invention is a package manufactured using the packaging material of the present invention. For example, the packaging material of the present invention is used, and the package is folded in two or two packaging materials are prepared. The sealant layers are overlapped with the surfaces thereof facing each other, and the peripheral ends thereof are formed, for example, by a side seal type, a two-side seal type, a three-side seal type, a four-side seal type, an envelope-attached seal type, and a gasket-attached seal type (pillow). Various types of packaging bags can be manufactured by heat sealing using a heat sealing mode such as a sealing type), a pleated sealing type, a flat bottom sealing type, a square bottom sealing type, and a gusset type.

The package of the present invention has excellent biomass degree and exhibits excellent hand-cutting properties and drop impact resistance. It can be suitably used as a film.
In the above, as a method of heat sealing, for example, a known method such as a bar seal, a rotating roll seal, a belt seal, an impulse seal, a high-frequency seal, and an ultrasonic seal can be used.

FIG. 3 is a front view showing an example of the configuration of a refill pouch, which is one mode of the package.
The refill pouch 100 shown in FIG. 3 is manufactured in a standing pouch format, and the bottom of the pouch is placed between the lower part of the front and rear wall films 11, 11 'made of the packaging material of the present invention. (The material may be the same as or different from the wall film.) A gusset portion 14 is formed by folding inward and inserting the bottom film folding portion 12 to form both sides of the bottom film folded inward. In this case, semicircular bottom film notches 13a and 13b are provided in the vicinity of the lower end, and the gusset portion 14 is heated by a ship bottom-shaped bottom seal portion 15 in which the 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 on both sides of the front and rear wall films 11, 11 'with side sealing portions 16a, 16b. At the same time, one of the upper corners (the left corner in the figure) of the pouch 100 has a tapered shape whose outer periphery is heat-sealed with a spout sealing portion 17 and has a narrow width facing obliquely outward and upward. The spout 20 is provided with notches 19a and 19b on both sides thereof, and is provided in a protruding shape.

In addition, a half-cut line 21 and a notch 22 at an upper end thereof are provided as an easy-opening means at an opening position on the tip end side of the spout 20.
A portion of the upper part of the pouch 100 where the spout 20 is not provided is heat-sealed by the upper seal portion 18. However, since this portion is used as a filling port for the contents, it is not filled before the contents are filled. This is an opening of the seal and heat-sealed after filling the contents.
In addition, the half cut line 21 is shown by three parallel half cut lines in the figure, but one or two, and a plurality of half cut lines such as one to three on each side of the center half cut line. An arbitrary shape such as a shape in which the half-cut lines are parallel or converge to the center half-cut line, or a shape in which a plurality of parallel half-cut lines and oblique half-cut lines obliquely intersecting the half-cut lines are combined. It can be provided in a shape.
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

The raw materials used in the examples are as follows.
-Aluminum foil 1: A1N30HO manufactured by Japan Foil Co., Ltd. 7 μm thick.
-Plant-derived ethylene glycol 1: manufactured by Indiaglycol. Biomass degree 100%.
-Plant-derived LDPE1: SBC818 manufactured by Braskem. Density 0.918 kg / m ³ , MFR 8.1 g / 10 min.
-Fossil fuel-derived LDPE1: high-pressure low-density polyethylene, UBE polyethylene F224N manufactured by Ube Maruzen Polyethylene Co., Ltd. Density 0.924 g / cm ³ , MFR 2.0 g / 10 min.
-DL adhesive 1: a polyol / isocyanate-based adhesive. For dry lamination method. Thermosetting.
-Slip agent 1: M425 manufactured by Ube Maruzen Polyethylene Co., Ltd. Erucamide / LDPE mass ratio = 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 degree of biomass based on radiocarbon ( ¹⁴ C) measurement is 13%.

[Production of sealant films 1 to 10]
The raw materials were blended and melt-mixed according to the formulation shown in Table 1 to prepare a polyethylene-based resin composition, which was formed into a thickness of 25 to 55 μm by a top-blowing air-cooled inflation co-extrusion film-forming machine, and the sealant films 1 to 10 I got

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

[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 the one shown in Table 1, and a laminate was evaluated in the same manner. Table 2 shows the structure of the laminate and the evaluation results.
[Comparative Example 4]
An anchor coat layer made of a polyurethane resin, which is a cured product of a polyol and an isocyanate compound, is applied to a plant-derived PET film 1 as a base material layer so that the applied amount after drying is 0.2 g / m ^2, and then sandwiched. The surface of the anchor coat layer of the plant-derived PET film 1 was bonded to the aluminum foil 1 as a barrier layer via the plant-derived LDPE1 using a lamination method.
At this time, the thickness of the plant-derived LDPE1 was 15 μm. Next, a polyethylene-based resin composition was extruded on the surface of the aluminum foil 1 by an extrusion coating method so as to have a thickness of 40 μm to obtain a laminate. At this time, the polyethylene-based resin composition had the same composition as the sealant film 2.
Table 2 shows the structure of the laminate and the evaluation results.

<Summary of evaluation results>
All of the examples had better environmental suitability than Comparative Examples 1 to 4, and exhibited a balance between equal or higher bag-breaking resistance and hand-opening property.

<Evaluation method>
[Bag resistance]
Each of the 10 pouch bags is filled with 360 ml of water and dropped vertically (bottom down) 10 times and horizontal (surface down) 10 times from a height of 1.2 m. The bag and the seal were checked for receding. Evaluation was made at normal temperature (25 ° C.) and low temperature (3 ° C.). The meaning of the notation of the result is as follows.
Judgment criteria 破: No bag breakage or retreat of the seal was observed.
：: Seal receding was observed very rarely.
Δ: Retraction of the seal was observed.
X: The bag was broken.

[Hand-cut openability]
The ten pouch bags were opened along the half-cut line from the notch portions, and the snagging at the start of opening and the presence or absence of elongation of the sealant film were checked. Evaluation was carried out by sharing two by five people.
Judgment criteria 初期: Initial opening is smooth, there is no catch and no elongation of the sealant. ○: There is a slight catch or a slight sealant elongation compared to ◎.
Δ: There is catching or sealant elongation.
×: The initial opening is heavy, and there is severe catching or elongation of the sealant.

DESCRIPTION OF SYMBOLS 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 portion 13 a, 13 b Bottom film cutout portion 14 Gusset portion 15 Bottom seal portions 16 a, 16 b Side seal portion 17 Outlet seal portion 18 Top Seal portions 19a, 19b Notch portion 20 Spout portion 21 Half cut line 22 Notch 100 Refillable packaging bag (pouch)

Claims (14)

A laminate for a hand-cut open package having at least a substrate 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,
The sealant layer is the outermost layer on one side of the laminate, containing low-density polyethylene,
The low-density polyethylene is characterized by containing a plant-derived low-density polyethylene,
Laminates for hand-opened packages.   The laminate according to claim 1, wherein the adhesive layer (1) and / or the adhesive layer (2) contains 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 said base material layer, the adhesive layer 1, the said barrier layer, the adhesive layer 2, and the said sealant layer are adjacent in this order, The any one of Claims 1-3 characterized by the above-mentioned. 13. The laminate according to the item.   5. The barrier layer according to claim 1, wherein the barrier layer is at least one selected from the group consisting of a metal foil, a metal deposition film, and a metal oxide film. 6. , Laminate.   The laminate according to any one of claims 1 to 4, wherein the barrier layer is a metal foil.   The laminate according to any one of claims 1 to 6, wherein the base layer includes a resin film.   The laminate according to any one of claims 1 to 6, wherein the base layer includes a resin film made of polyester.   The laminate according to any one of claims 1 to 8, wherein the base material layer includes a resin film made of recycled polyester or plant-derived polyester. The laminate has a half-cut line for hand-cut opening,
The half-cut line penetrates the base material layer, and is formed so as not to penetrate the barrier layer, the adhesive layer 2, and the sealant layer,
The laminate according to any one of claims 1 to 9. The laminate has a group of scars for hand cutting and opening,
The scar group penetrates the base material layer, and is formed so as not to penetrate the barrier layer, the adhesive layer 2, and the sealant layer.
The laminate according to any one of claims 1 to 9.   A packaging material produced from the laminate according to any one of claims 1 to 11.   A package made from the packaging material according to claim 12.   A packaging bag made from the packaging material according to claim 12.

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