JP6827764B2 - Easy-to-peel laminate - Google Patents

Description

The present invention relates to an easily peelable laminate.

As a packaging body such as a lid material and a bag body, a packaging body including at least two layers of an outer layer and an inner layer that is detachably laminated on the outer layer is used. In this laminated body, usually, an easily peelable layer is provided at the interface between the outer layer and the inner layer to facilitate peeling, and at least a part (peeling portion) of the outer layer is peeled off. The inner layer can be exposed. Various configurations are disclosed as materials constituting this easily peelable layer.

Patent Document 1 discloses that as one aspect of the easily peelable layer, a mixed resin layer formed of a mixed resin in which a polyolefin and a cyclic olefin copolymer are mixed in a predetermined ratio is used. In Patent Document 1, it is stated that the interface between the mixed resin layer and the polyester film layer laminated in contact with the mixed resin layer is the peeling surface.

Patent Document 2 discloses that a peeling varnish layer is used between the sealing varnish layer and the polyethylene layer as one aspect of the easily peelable layer. In Patent Document 2, the interface between the release varnish layer and the polyethylene layer is defined as the release surface.

JP-A-2007-320580 Japanese Unexamined Patent Publication No. 2012-051640

When the easily peelable layer of Patent Document 1 is used, the layer thickness needs to be as thick as about 20 μm, which increases the cost. Further, in order to maintain the peel strength with high accuracy, it is necessary to precisely adjust the kneading conditions and the extrusion conditions.

Further, when the easily peelable layer of Patent Document 2 is used, the peelable varnish layer itself, which is the easily peelable layer, has no adhesiveness, and it is necessary to provide a separate adhesive layer, and the adhesive strength is adjusted by the application pattern of the peelable varnish. However, in this method, the cost of the adhesive layer and the cost of the coating process are high, and as a result, the cost of the package is high.

Further, depending on the use of the package, it may be necessary to be able to reseal (reseal) after the outer layer is peeled off.

Furthermore, when the package is used for food and drink, depending on the location where the outer layer is peeled off, the food and drink may adhere to the location, or the user may directly touch the location, so the easily peelable layer. There is also a need to consider the hygiene aspect of the materials used in.

Therefore, there is a need to provide a package having an easily peelable layer having advantages such as being obtained at low cost.

As a result of diligent studies, the present inventors have found that the above problems can be solved by the following means, and have completed the present invention. That is, the present invention is as follows:
<1> An easily peelable laminate comprising a first base material layer and an easily peelable layer existing on the first base material layer.
The easily peelable layer is an amorphous polyester layer having a glass transition temperature of 25 ° C. or lower.
Easy-to-peel laminate.
<2> The easily peelable layer further includes a second base material layer existing on the side where the first base material layer does not exist, and the second base material layer is further provided. Is a single-layer resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is in contact with the easily peelable layer.
The easily peelable laminate according to the above item <1>.
<3> The easily peelable laminate is cut into a rectangle of 25 mm × 150 mm, and the second base material layer is peeled off from the first base material layer at 300 mm / min from the short side to the long side. The easy peeling according to the above item <2>, wherein the average peeling strength at a peeling length of 10 to 30 mm is 0.3 N / 25 mm to 4.5 N / 25 mm when peeled by 180 ° under the condition of a length of 35 mm. Sex laminate.
<4> The easily peelable laminate according to any one of the above items <1> to <3>, wherein the easily peelable layer is present in an amount of 4.0 g / m ² or less.
<5> The easily peelable laminate according to any one of the above items <1> to <4>, wherein the amorphous polyester has a glass transition temperature of −50 ° C. or higher.
<6> The above-mentioned <1> to <5>, wherein the number average molecular weight of the above-mentioned amorphous polyester as measured by gel permeation chromatography in a tetrahydrofuran solvent and polystyrene standard is 100,000 or less. The easily peelable laminate according to any one of the items.
<7> The above <1> to <6>, wherein the first and / or the second base material layer further includes a sealant layer as a layer that is not in contact with the easily peelable layer of the outermost layers. The easily peelable laminate according to any one of the items.
<8> The easily peelable laminate according to any one of the above items <2> to <7>, wherein the first and / or the second base material layer has a half cut line.
<9> The easily peelable layer further includes a second base material layer that exists on the side where the first base material layer does not exist.
The second base material layer is a single resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. Is in contact with
It has a peeling tab for peeling the second base material layer from the easily peelable layer, and the second base material layer and the easily peelable layer of the peeling tab It has a release agent layer in at least a part of the area between them.
The easily peelable laminate according to any one of the above items <1> to <8>.
<10> The easily peelable layer further includes a second base material layer that is present on the side where the first base material layer does not exist.
The second base material layer is a single resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. Is in contact with
It has a peeling tab for peeling the second base material layer from the easily peelable layer.
The peeling tab and the other portion of the easily peelable laminate are defined by a peeling trigger half-cut line engraved from the first base material layer side or the second base material layer side. A release agent layer is provided between the second base material layer and the easily peelable layer so as to surround the peeling trigger half-cut line.
The easily peelable laminate according to any one of the above items <1> to <8>.
<11> A lid material having the easily peelable laminate according to any one of the above items <1> to <10>.
<12> A lid material for instant foods
It further includes a second base material layer that exists on the side of the easily peelable layer on the side where the first base material layer does not exist.
The second base material layer is a single-layer resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. Is in contact with
One of the first and second base material layers is an inner layer, and the other is an outer layer.
The inner layer includes an inner layer half-cut line for an opening that exists so as to define a part of the inner layer, and when the outer layer is peeled from the inner layer, a part of the inner layer. Region is separated from the other part of the inner layer together with the outer layer to form an opening in the inner layer.
The lid material according to the above item <11>.
<13> A packaging bag having the easily peelable laminate according to any one of the above items <1> to <10>.
<14> A packaging bag containing the contents.
The easily peelable layer further includes a second base material layer existing on the side where the first base material layer does not exist, and the second base material layer is simply It is a laminate having at least a resin layer or a metal layer, or a resin layer or a metal layer, and the resin layer or the metal layer is in contact with the easily peelable layer.
One of the first and second base material layers is an inner layer, and the other is an outer layer.
The inner layer includes an inner layer half-cut line for an opening that exists so as to define a part of the inner layer, and when the outer layer is peeled from the inner layer, a part of the inner layer. Region is separated from the other part of the inner layer together with the outer layer to form an opening in the inner layer.
The packaging bag according to item <13> above.
<15> Applying a solution of amorphous polyester to the first base material layer, and drying the solution of amorphous polyester to form an easily peelable layer.
Including
The amorphous polyester has a glass transition temperature of 25 ° C. or lower.
A method for producing an easily peelable laminate.
<16> The method according to <15>, further comprising crimping a second base material layer to the easily peelable layer.
<17> The method according to <16>, further comprising applying a release agent to the second base material layer.

According to the present invention, it is possible to provide a package having an easily peelable layer having advantages such as being obtained at low cost.

FIG. 1 is a diagram showing a layer structure of the easily peelable laminate of the present invention. FIG. 2 is an explanatory diagram of 180 ° peeling. FIG. 3 is a diagram showing a layer structure of an easily peelable laminate of the present invention having a peeling tab and a peeling agent layer. FIG. 4 is a diagram showing a layer structure of an easily peelable laminate of the present invention having a peeling tab, a peeling agent layer, and a half-cut line for a peeling trigger. FIG. 5 is a diagram showing an example of a region where the release agent layer is formed. FIG. 6 is a top view and a side sectional view of an embodiment of the lid material of the present invention. FIG. 6A is a top view of the lid material of the present invention, and FIG. 6B is a side sectional view of the lid material of the present invention when the first base material layer is peeled off. FIG. 7 is a top view and a side sectional view of another embodiment of the lid material of FIG. FIG. 7A is a top view of the lid material of the present invention, and FIG. 7B is a side sectional view of the lid material of the present invention when the first base material layer is peeled off. FIG. 8 is a top view and a side sectional view of another embodiment of the lid material of the present invention. FIG. 8A is a top view of the lid material of the present invention, and FIG. 8B is a side sectional view of the lid material of the present invention when the first base material layer is peeled off. FIG. 9 is a top view and a side sectional view of another embodiment of the lid material of FIG. 9 (a) is a top view of the lid material of the present invention, and FIG. 9 (b) is a side sectional view of the lid material of the present invention when the first base material layer is peeled off. FIG. 10 is a diagram showing an embodiment of the packaging bag of the present invention. 10 (a) is a side sectional view of one embodiment of the packaging bag of the present invention, and FIG. 10 (b) is a top view of one embodiment of the packaging bag of the present invention, FIG. 10 (c). Is a side sectional view of one embodiment of the packaging bag of the present invention when the first base material layer is peeled off. FIG. 11 is a diagram showing another embodiment of the packaging bag of FIG. 11 (a) is a side sectional view of one embodiment of the packaging bag of the present invention, and FIG. 11 (b) is a top view of one embodiment of the packaging bag of the present invention, FIG. 11 (c). Is a side sectional view of one embodiment of the packaging bag of the present invention when the first base material layer is peeled off. FIG. 12 is a diagram showing another embodiment of the packaging bag of the present invention. 12 (a) is a side sectional view of another embodiment of the packaging bag of the present invention, and FIG. 12 (b) is a top view of another embodiment of the packaging bag of the present invention. c) is a side sectional view of another embodiment of the packaging bag of the present invention when the first base material layer is peeled off. FIG. 13 is a diagram showing another embodiment of the packaging bag of FIG. 13 (a) is a side sectional view of another embodiment of the packaging bag of the present invention, and FIG. 13 (b) is a top view of another embodiment of the packaging bag of the present invention. c) is a side sectional view of another embodiment of the packaging bag of the present invention when the first base material layer is peeled off. FIG. 14 is a diagram showing a further embodiment of the packaging bag of the present invention. 14 (a) is a cross-sectional view taken along the line XX'of FIG. 14 (b) of a further embodiment of the packaging bag of the present invention, and FIG. 14 (b) is a modification of the packaging bag of the present invention. 14 (c) is a cross-sectional view taken along the line YY'of FIG. 14 (b), which is a further embodiment of the packaging bag of the present invention. Is a cross-sectional view taken along the line YY'of FIG. 14 (b) when the first base material layer is peeled off in a further embodiment of the packaging bag of the present invention. FIG. 15 is a diagram showing another embodiment of the packaging bag of FIG. 15 (a) is a cross-sectional view taken along the line XX'of FIG. 15 (b) of a further embodiment of the packaging bag of the present invention, and FIG. 15 (b) is a modification of the packaging bag of the present invention. 15 (c) is a cross-sectional view taken along the line YY'of FIG. 15 (b), which is a further embodiment of the packaging bag of the present invention. Is a cross-sectional view taken along the line YY'of FIG. 15 (b) when the first base material layer is peeled off in a further embodiment of the packaging bag of the present invention. FIG. 16 is a diagram showing an embodiment of the method for producing an easily peelable laminate of the present invention.

《Easy-to-peel laminate》
As shown in FIG. 1 (a), the easily peelable laminate (10a) of the present invention is easily present on the first base material layer (2) and the first base material layer (2). It includes a peelable layer (4). This easily peelable layer is an amorphous polyester layer having a glass transition temperature of 25 ° C. or lower.

The first base material layer can be, in particular, a single-layer resin layer or metal layer, or a laminate having at least a resin layer or metal layer. In particular, the layer in contact with the easily peelable layer of the first base material layer can be a resin layer or a metal layer.

The present inventors use an amorphous polyester layer having a glass transition temperature of 25 ° C. or lower as an easily peelable layer to have a thin film thickness, particularly when it is pressure-bonded to a resin layer or a metal layer. It has been found that an appropriate degree of easy peeling property can be realized, and as a result, the cost of the package can be reduced. We do not want to be bound by theory, but this is believed to be due to the high affinity of amorphous polyesters with resins and metals. Further, since the amorphous polyester has an extremely low elution into food and drink, the easily peelable laminate of the present invention is particularly useful when used in a package for food and drink.

In particular, in one embodiment of the present invention, the easily peelable laminate is cut into a rectangle of 25 mm × 150 mm, and the first base material layer to the second base material layer are separated from the short side to the long side. The average peel strength at a peel length of 10 to 30 mm when peeled by 180 ° under the conditions of 300 mm / min and a peel length of 35 mm can be 0.3 N / 25 mm to 4.5 N / 25 mm.

More specifically, first, the easily peelable laminate is cut into a rectangular sample of 25 mm × 150 mm, and the second base material layer is peeled by 35 mm from the short side to the long side. Next, as shown in FIG. 2, a pair of grippers (14a) facing each other on the first base material layer (2) side and the second base material layer (6) side of the peeled portion , 14b), and peeling 180 ° from the short side to the long side under the conditions of 300 mm / min and a peeling length of 35 mm, and the average peeling strength at a peeling length of 10 to 30 mm is obtained. The peeling and the measurement of the average peeling strength can be performed using, for example, the Strograph VES1D manufactured by Toyo Seiki Co., Ltd.

Further, the present inventors use an amorphous polyester layer having a glass transition temperature of 25 ° C. or lower as an easily peelable layer, and use a resin layer or a metal layer as an adhesion surface with the easily peelable layer. As a result, it has been found that after the first base material layer is peeled from the second base material layer, the peeled surface does not become sticky, and then the two can be resealed when they are crimped again.

In particular, in one embodiment of the present invention, the first base material layer and the second base material layer are resealed by reciprocating once with a 2 kg roller with respect to the adherend surface having a width of 25 mm, and then the first base layer is formed. Average peel strength at a peel length of 10 to 30 mm when the second base material layer from the material layer is peeled 180 ° from the short side to the long side under the conditions of 300 mm / min and a peel length of 35 mm. Can be 0.05 N / 25 mm to 1.50 N / 25 mm.

In one embodiment of the present invention, as shown in FIG. 1 (b), the easily peelable laminate (10b) of the present invention is the first base material layer (2) of the easily peelable layer (4). A second base material layer (6), which is present on the side where is not present, may be further provided.

The second base material layer is a resin layer or a metal layer which is a single layer, or is a laminate having at least a resin layer or a metal layer. In any case, the layer in contact with the easily peelable layer of the second base material layer is a resin layer or a metal layer.

Further, the first and / or the second base material layer may further include an optional sealant layer as a layer that is not in contact with the easily peelable layer of the outermost layer.

In one embodiment of the invention, the first and / or second substrate layer may have a half cut line.

In one embodiment of the present invention, as shown in FIGS. 3 (a) and 3 (b), the easily peelable laminate (10c) of the present invention is a second base material from the easily peelable layer (4). It has a peeling tab (16) for peeling the layer (6), and the peeling tab (16) is between the second base material layer (6) and the easily peelable layer (4). The release agent layer (8) may be provided in at least a part of the region.

According to this embodiment, a region where the easily peelable layer and the second base material layer are not adhered is formed to form a peeling tab, and this is used as a peeling trigger to form a second from the easily peelable layer. The base material layer can be easily peeled off.

Further, in one embodiment of the present invention, as shown in FIGS. 4 (a) to 4 (c), the easily peelable laminate (10d) of the present invention is the second from the easily peelable layer (4). It has a peeling tab (16) for peeling the base material layer (6), and the peeling tab (16) and the other part of the easily peelable laminate (10d) are the first base material. It is defined by a peeling trigger half-cut line (6c) engraved from the layer side or the second base material layer side, and as shown in FIGS. 4 (a) and 4 (b), for the peeling trigger. A release agent layer (8) is provided in at least a part of the region between the second base material layer (6) and the easily peelable layer (4) so as to surround the half cut line (6c). You may be.

In this embodiment, the easily peelable layer and the second base material layer are adhered to each other at the tip of the peeling tab, but the peeling agent layer is present in the region around the peeling trigger half-cut line. As a result, the peeling strength of this region is low, so that when the peeling operation is performed, the second base material layer can be easily peeled from the easily peelable layer triggered by the peeling trigger half-cut line.

In the embodiment having the release agent layer (8), the release agent layer (8) may be laminated so as to fill the coating area as shown in FIG. 5 (a), and FIGS. 5 (b) and (c) may be laminated. ), The pattern may be laminated as a pattern including a region to which the release agent is not applied. According to the embodiments shown in FIGS. 5 (b) and 5 (c), the peel strength can be locally reduced, whereby the second base material layer can be easily peeled from the easily peelable layer.

In the embodiments shown in FIGS. 5B and 5C, the stacking density of the release agent layer can be 10% or more, 20% or more, 30% or more, and 100%, depending on the desired adhesive strength. Below, it can be 90% or less, or 80% or less. Here, the "lamination density" of the release agent layer is referred to in units of% as the ratio of the area to which the release agent is applied per unit area.

Hereinafter, each component of the present invention will be described.

<First base material layer>
The first base material layer is a layer existing on the easily peelable layer. In particular, the first base material layer can be a single-layer resin layer or metal layer, or can be a laminate having at least a resin layer or a metal layer. In particular, the layer in contact with the easily peelable layer of the first base material layer can be a resin layer or a metal layer.

When the first base material layer is a laminated body, the first base material layer may have an optional sealant layer and other layers as a layer that is not in contact with the easily peelable layer.

(Resin layer)
As the resin layer, a commercially available film, extruded resin, or the like can be appropriately used.

For example, as the film, polyethylene terephthalate film (PET), low density polyethylene film (LDPE), medium density polyethylene film (MDPE), high density polyethylene film (HDPE), linear low density polyethylene film (LLDPE), polypropylene film ( PP), nylon film (Ny) and the like may be used alone or in combination.

The extruded resin includes low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), ethylene methacrylate copolymer (EMAA), and ethylene acrylic acid copolymer weight. Coalescence (EAA) and the like may be used alone or in combination.

Further, the resin layer may include other layers such as an adhesive layer, an inorganic vapor deposition layer, and a barrier coat layer.

(Metal layer)
As the metal layer, for example, a metal foil such as an aluminum foil, a copper foil, or a titanium foil, or an alloy foil such as an aluminum alloy foil or a stainless steel foil can be used.

(Sealant layer)
The sealant layer is a layer for heat-sealing the easily peelable laminate to another structure such as a container. In particular, in the first base material layer and the second base material layer of the present invention, the outermost layer is a layer that is not in contact with the easily peelable layer.

The material of the heat seal layer is selected depending on the material to be sealed. For example, LDPE, LLDPE, PP, ethylene-methacrylic acid copolymer (EMAA), ethylene-acrylic acid copolymer (EAA), ionomer resin, ethylene-acetic acid. A resin such as a vinyl copolymer may be used. These resins may be in the form of, for example, a stretched or unstretched film, a molten resin for extrusion lamination, a paint for hot melting, and the like.

Further, as the sealant layer, a commercially available easy peel resin or easy peel sealant film which is not composed of these resins may be used.

(Other layers)
Examples of the other layer include a paper layer, an adhesive layer, a printing layer and the like. Lamination of the other layers can be performed by, for example, extrusion lamination such as sand lamination or back lamination, dry lamination, or the like.

As the paper layer, coated paper, art paper, or the like can be used.

As the adhesive layer, for example, a dry laminate adhesive, an anchor coat adhesive, a hot melt adhesive, a water-soluble adhesive, an emulsion adhesive, a non-solvent laminate adhesive, a thermoplastic resin for extrusion lamination, or the like should be used. Can be done.

The printing layer may be, for example, a printing layer showing character information, a mark printing layer, a light-shielding printing layer, a pattern printing, a photographic printing layer, or the like. Further, the print layer can be formed by gravure printing, flexographic printing, or the like.

<Easy peelable layer>
The easily peelable layer is an amorphous polyester layer having a glass transition temperature of 25 ° C. or lower.

It is preferable that the easily peelable layer is present in an amount of 4.0 g / m ² or less from the viewpoint of achieving good easy peeling property and good resealing property. This amount, 3.8 g / ^{m 2} or less, or 3.5 g / ^{m 2} can be less, also 0.1 g / ^{m 2} or more, 0.3 g / ^{m 2} or more, or 0.5 g / ^{m 2} It can be more than that.

(Amorphous polyester)
Amorphous polyester has a glass transition temperature of 25 ° C. or lower. The glass transition temperature can be 25 ° C. or lower, 22 ° C. or lower, or 20 ° C. or lower, and can be -50 ° C. or higher, -40 ° C. or higher, -30 ° C. or higher, or -20 ° C. or higher. .. Within the above range, easy peeling property and resealability that do not cause any problem in practical use can be ensured, but from the viewpoint of not causing peeling (pulse peeling) accompanied by abnormal noise or catching, that is, a viewpoint of causing smooth peeling. Therefore, the glass transition temperature is preferably 15 ° C. or lower, 10 ° C. or lower, or 5 ° C. or lower.

Here, "amorphous" in the present invention does not have a clear melting peak when the temperature is raised from -100 ° C to 300 ° C at a rate of 20 ° C / min using a differential scanning calorimeter (DSC). Means that.

The glass transition temperature (Tg) in the present specification is determined by heat flux differential scanning calorimetry (heat flux DSC) under heating conditions of a heating rate of 10 ° C./min in accordance with JIS K7121 (1987). The intermediate point glass transition temperature (° C.) is referred to, and JIS K7121 "When measuring the glass transition temperature after performing a certain heat treatment" shall be adopted for adjusting the state of the test piece.

The number average molecular weight of the amorphous polyester is preferably 100,000 or less, 90,000 or less, 80,000 or less, 70,000 or less, 60,000 or less, or 50,000 or less from the viewpoint of not causing stickiness of the easily peelable layer after peeling. It is preferably 5000 or more, 6000 or more, 7000 or more, 8000 or more, 9000 or more, or 10000 or more from the viewpoint of ensuring an appropriate peel strength.

Here, the number average molecular weight in the present specification means the number average molecular weight measured by gel permeation chromatography in a tetrahydrofuran solvent and polystyrene standard.

Such an amorphous polyester is an amorphous polyester containing 50 mol% of a dicarboxylic acid component and 50 mol% of a glycol component, and is 30 mol% or more of terephthalic acid and 25 mol% or more of ethylene. Acrystalline polyester containing glycol and 5 to 45 mol% of other dicarboxylic acid components and / or other glycol components can be used.

Other dicarboxylic acid components include isophthalic acid, orthophthalic acid, 1,5-naphthalic acid, 2,6-naphthalic acid, 4,4'-diphenyldicarboxylic acid, 2,2'-diphenyldicarboxylic acid, 4,4'. -Aromatic dibasic acid such as diphenyl ether dicarboxylic acid, adipic acid, azelaic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 4-methyl-1 , 2-Cyclohexanedicarboxylic acid, dimeric acid and other aliphatic and alicyclic dicarboxylic acids can be mentioned.

Other diol components include propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, and 1, , 5-Pentanediol, 1,6-Hexanediol, 3-Methyl-1,5-Pentanediol, Neopentyl glycol, Diethylene glycol, Dipropylene glycol, 2,2,4-trimethyl-1,3-Pentanediol, Cyclohexane Dimethanol, neopentyl hydroxypivalic acid ester, 1,9-nonanediol, 2-methyloctanediol, 1,10-dodecanediol, 2-butyl-2-ethyl-1,3-propanediol, tricyclodecanedimethanol And so on.

<Second base material layer>
The second base material layer is a layer on the easily peelable layer that exists on the side where the first base material layer does not exist. The second base material layer is a resin layer or a metal layer which is a single layer, or is a laminate having at least a resin layer or a metal layer. In either case, the layer in contact with the easily peelable layer of the second base material layer is a resin layer or a metal layer. The second base material layer may be the same as or different from the first base material layer.

As the resin layer, the metal layer, and the optional sealant layer and other layers, those mentioned with respect to the first base material layer can be used.

<Half cut line>
The half-cut line is a notch formed from the surface of the easily peelable laminate to a depth less than the thickness of the easily peelable laminate.

For example, the half-cut line can be formed by inserting a cutting machine such as a cutter on the surface of the easily peelable laminate. Further, the half cut line can be formed on the first base material layer side and / or the second base material layer side.

For example, the half-cut line on the first base material side is carved from the surface of the first base material layer of the easily peelable laminate to a depth that penetrates at least a part or all of the first base material layer. There is.

The half-cut line on the side of the first base material layer is carved at a depth that penetrates at least a part or all of the first base material layer in the thickness direction of the first base material layer of the easily peelable laminate. Has been done. Therefore, the depth of the first base material layer half-cut line is substantially equal to the thickness of the first base material layer of the easily peelable laminate.

For example, the half-cut line on the side of the first base material layer can be formed to a depth reaching the easily peelable layer from the surface of the first base material layer. In this case, the second base material layer can be peeled off at the interface between the first base material layer and the easily peelable layer. Further, the half-cut line on the side of the first base material layer can be formed from the surface of the first base material layer until it penetrates the easily peelable layer. In this case, the second base material layer can be peeled off at the interface between the second base material layer and the easily peelable layer.

The following describes various aspects of the half-cut line when one of the first and second lid materials is used as the inner layer and the other is used as the outer layer in the lid material or packaging bag having the easily peelable laminate. explain.

{Inner layer half-cut line for opening}
The inner layer half-cut line for opening exists so as to define a part of the inner layer. When the outer layer is peeled from the inner layer, this part of the region is separated from the other part of the inner layer together with the outer layer, and an opening is formed in the inner layer.

This part of the region may be a closed region or an unclosed region. Examples of the closed region include an annular shape, a polygonal shape, a rounded polygonal shape, and the like.

{Half-cut line for peeling trigger}
The peeling trigger half-cut line is a half-cut line used as an element for peeling the other base material layer from one base material layer, particularly as an element for peeling the outer layer from the inner layer, that is, as a peeling trigger. In particular, when the peeling tab and the other area of the packaging laminate are defined by the peeling trigger half-cut line, the peeling trigger half-cut line exists so as to cross the side portion of the peeling tab. May be good.

{Outer layer half cut line}
The outer layer half-cut line is a half-cut line for defining the planned peeling portion.

<Peeling tab>
The peeling tab is a peeling tab for peeling between the easily peelable layer and the second base material layer.

The peeling tab and the other area of the packaging laminate may be defined by a region where the release agent layer is laminated or a peeling trigger half-cut line.

The peeling tab can be, for example, a form in which a part of the easily peelable laminate is projected.

<Release layer>
The release agent layer is present in at least a part of the region between the second base material layer and the easily peelable layer of the release tab, or surrounds the release trigger half-cut line. It is an optional layer that can exist between the base material layer of 2 and the easily peelable layer. The presence of this release agent layer can reduce the release strength between the easily release layer and the second base material layer.

Further, the release agent layer may be partially present between the second base material layer and the easily release layer. More specifically, the release agent layer may exist as a pattern including a region between which the release agent is not applied.

The release agent layer includes a nitrocellulose resin, a urethane resin, a silicone resin, a silicone oil, an aminoalkyd resin, a polyamide resin, a polyester resin, an aqueous varnish, an oil varnish, an ultraviolet curable varnish, or a mixture thereof. It may be.

Further, the release agent layer is more preferably a mixture of at least one of the resins listed above and a wax. The content of wax in the mixture may be about 20% by mass or more, or about 30% by mass or more, and may be about 85% by mass or less, or about 80% by mass or less, based on the mass of the mixture. ..

《Lid material》
The lid material of the present invention has the above-mentioned easily peelable laminate.

The lid material of the present invention can be used as a lid material for instant foods. That is, the lid material for instant food further includes the above-mentioned second base material layer which is present on the side of the easily peelable layer where the first base material layer does not exist, and the first One of the first and second base material layers is an inner layer, the other is an outer layer, and the inner layer comprises an inner layer half-cut line for opening which exists so as to define a part region of the inner layer. When the outer layer is peeled off from the inner layer, a part of the inner layer is separated from the other part of the inner layer together with the outer layer, and an opening is formed in the inner layer. Further, in one embodiment of the lid material, the inner layer and the outer layer can be resealed by returning the peeled portion to the state before peeling and crimping.

Examples of instant foods include those that are supposed to be poured after opening the lid material and then discharged to perform processing such as cooking, such as instant noodles.

An embodiment of the lid material of the present invention will be described with reference to FIG. In this lid material, the first base material layer is an outer layer and the second base material layer is an inner layer. FIG. 6A is a top view of the lid material of the present invention, and FIG. 6B is a side sectional view of the lid material of the present invention when the outer layer is peeled off.

In one embodiment of the lid material of the present invention, the planned peeling portion (42) is a part of the first base material layer (2) as the outer layer of the lid material (40a) as shown in FIG. It is formed by inserting the outer layer half cut line (2a) from the outer layer side only. When pouring hot water into the container (20) of instant noodles, the lid material (40a) is peeled off from the container (20) by about half using the opening tab (44). Further, when the boiling water is discarded from the container (20) after a certain period of time has elapsed, the planned peeling portion (42) is peeled off from the inner layer half-cut line (6c) for the peeling trigger to expose the opening (6b). This opening (6b) is formed by inserting an inner layer half-cut line (6a) for opening from the inner layer side, and before peeling off the planned peeling portion (42), the second base material layer (6b) as the inner layer of the lid material ( Although it is integrated with 6), when the planned peeling portion (42) is peeled off, the half-cut portion is removed along with the scheduled peeling portion and appears.

In another embodiment of this lid material, the release agent layer (8) may be present so as to surround the inner layer half-cut line (6c) for the release trigger, as shown in FIG. 7 (a). .. The release agent layer (8) may exist between the easily release layer (4) and the second base material layer (6), for example, as shown in FIG. 7 (b).

Another embodiment of the lid material of the present invention will be described with reference to FIG. In this lid material, the first base material layer is an outer layer and the second base material layer is an inner layer. FIG. 8A is a top view of the lid material of the present invention, and FIG. 8B is a side sectional view of the lid material of the present invention when the outer layer is peeled off.

In another embodiment of the lid material of the present invention, as shown in FIG. 8, the lid material (50a) comprises a peeling tab (56) and an opening tab (54). Further, in the lid material (50a), an inner layer half-cut line (6a) for opening is engraved in a region inside the flange portion of the container (20). When pouring hot water into the container (20), the peeling tab (56) is pinched, and the first base material layer which is the outer layer of the lid material (50a) is removed from the inner layer half cut line (6c) for the peeling trigger. Peel about three-quarters from the container (20) to expose the opening (6b). This opening (6b) is formed by inserting an inner layer half-cut line (6a) for opening from the inner layer side, and before peeling off the first base material layer, the second base material layer (6b) as the inner layer of the lid material ( Although it is integrated with 6), when the first base material layer is peeled off, the half-cut portion is removed along with the first base material layer to be exposed.

Further, when the contents are steamed for a certain period of time after hot water supply, it is possible to reseal by returning the first base material layer that has been peeled off by about 3/4.

Then, when eating after steaming the contents, the second base material layer (6) is peeled from the container (20) by pinching the opening tab (54) and peeling the entire lid material from the container. can do.

In another embodiment of this lid material, as shown in FIG. 9A, the release agent layer (8) may be present so as to surround the inner layer half-cut line (6c) for the release trigger. .. The release agent layer (8) may exist between the easily release layer (4) and the second base material layer (6), for example, as shown in FIG. 9 (b).

《Packaging bag》
The packaging bag of the present invention has the above-mentioned easily peelable laminate.

The packaging bag of the present invention can be used as a packaging bag containing contents. That is, the packaging bag containing the contents further includes the above-mentioned second base material layer which is present on the side of the easily peelable layer where the first base material layer does not exist, and the first And one of the second substrate layers is the inner layer, the other is the outer layer, and the inner layer comprises an inner layer half-cut line for opening which exists so as to define a part region of the inner layer. When the outer layer is separated from the inner layer, a part of the inner layer is separated from the other part of the inner layer together with the outer layer, and an opening is formed in the inner layer. Further, in one embodiment of the packaging bag, the inner layer and the outer layer can be resealed by returning the peeled portion to the state before peeling and crimping.

The content may be, for example, a solid, a gel, or the like, and may be, for example, an article such as a chemical, a cosmetic, a detergent, an air freshener, a pharmaceutical product, or a wet tissue.

An embodiment of the packaging bag of the present invention will be described with reference to FIG. 10 (a) is a side sectional view of one embodiment of the packaging bag of the present invention, and FIG. 10 (b) is a top view of one embodiment of the packaging bag of the present invention, FIG. 5 (c). Is a side sectional view of one embodiment of the packaging bag of the present invention when the first base material layer is peeled off.

In the packaging bag (100a) shown in FIGS. 10A and 10B, the two second base material layers (6) face each other and are heat-sealed at the peripheral seal portion (102). The main body is formed, and the opening / closing portion (104) on the main body of the packaging bag is composed of the first base material layer (2) and the easily peelable layer (4). A half-cut line (6a) is engraved from the packaging bag body side in a region where the opening / closing portion (104) and the packaging bag body overlap. When the opening / closing portion of the packaging bag is turned up, the half-cut portion is removed accompanying the opening / closing portion, and an opening (6b) is formed.

In another embodiment of this packaging bag, as shown in FIG. 11B, the release agent layer (8) may be present in the region corresponding to the opening / closing portion (104). The release agent layer (8) may exist between the easily release layer (4) and the second base material layer (6), for example, as shown in FIG. 11 (a).

Another embodiment of the packaging bag of the present invention will be described with reference to FIG. 12 (a) is a side sectional view of another embodiment of the packaging bag of the present invention, and FIG. 12 (b) is a top view of another embodiment of the packaging bag of the present invention. c) is a side sectional view of another embodiment of the packaging bag of the present invention when the first base material layer is peeled off.

In the packaging bag (200a) shown in FIGS. 12 (a) and 12 (b), the surface of the bottom surface side sheet, the first base material layer (2), the easily peelable layer (4), and the second base material layer. The second base material layer (6) of the upper surface side sheet laminated in the order of (6) faces each other, and the peripheral edge of the sheet is sealed by the side edge sealing portion (202a) and the edge sealing portion (202b). The main body of the packaging bag (200a) is formed, and one end edge seal portion (202b) is formed as a seal inside the bag from the edge of the sheet, so that it extends to the outside of the edge seal portion (202b). It is provided with an extended portion (204).

Then, an inner layer half-cut line (6c) for a peeling trigger is formed so as to penetrate the second base material layer of the upper surface sheet between the extending portion (204) and the edge sealing portion (202b), and further. The inner layer half-cut line (6a) for opening that penetrates the second base material layer of the upper surface sheet inside the packaging bag surrounded by the edge sealing portion (202b) and the side edge sealing portion (202a) is one. It is formed to form a closed area.

When the extending portion (204) of the packaging bag is picked and the upper surface sheet is turned up, the half-cut portion is removed accompanying the opening / closing portion, and an opening (6b) is formed.

In addition, it is possible to reseal by returning the peeled first base material layer (2) to its original state.

In another embodiment of this packaging bag, the release agent layer (8) may be present so as to surround the inner layer half-cut line (6c) for the release trigger, as shown in FIG. 13 (b). .. The release agent layer (8) may exist between the easily release layer (4) and the second base material layer (6), for example, as shown in FIG. 13 (a).

The packaging bag of the present invention has the above-mentioned easily peelable laminate. Further embodiments of the packaging bag of the present invention will be described with reference to FIG. 14 (a) is a cross-sectional view taken along the line XX'of FIG. 14 (b) of a further embodiment of the packaging bag of the present invention, and FIG. 14 (b) is a modification of the packaging bag of the present invention. 14 (c) is a cross-sectional view taken along the line YY'of FIG. 14 (b), which is a further embodiment of the packaging bag of the present invention. Is a cross-sectional view taken along the line YY'of FIG. 14 (b) when the first base material layer is peeled off in a further embodiment of the packaging bag of the present invention.

In the packaging bag (250a) shown in FIGS. 14 (a) to 14 (d), the first base material layer (2), the easily peelable layer (4), and the second base material layer (6) were laminated in this order. The easily peelable laminate is formed into a tubular shape with the second base material layer (6) inside, heat-sealed at the back seal portion (252), and then the end so that the back seal portion (252) is in the center. It is a pillow bag (250a) sealed with an edge sealing portion (254a, 254b).

In this pillow bag, as shown in FIG. 14 (a), the easily peelable layer (4) is formed from the first base material layer (2) side on the top surface side of the bag without the back seal portion (252). The penetrating outer layer half-cut line (2a) is engraved to form an unclosed region, for example, to form a U-shape with the right side open when viewed from the top of the bag. Further, inside the U-shaped region, the opening inner layer half-cut line (6a) reaching the easily peelable layer (4) from the second base material layer (6) side is closed. It is formed so as to form a designated area.

Then, when the peeling tab (256), which is the U-shaped closing part (left side part), is picked up and the sheet is turned up, the half-cut part is removed along with the opening / closing part, and the opening (6b). ) Is formed.

Further, it is possible to reseal by returning the peeled first base material layer to its original state.

In another embodiment of this packaging bag, the release agent layer (8) may be present around the release tab (256), as shown in FIG. 15 (b). The release agent layer (8) may exist between the easily release layer (4) and the second base material layer (6), for example, as shown in FIG. 15 (c).

Each configuration of the lid material and the packaging bag described above can be appropriately combined as needed.

<< Manufacturing method of easily peelable laminate >>
The method of the present invention for producing an easily peelable laminate includes an amorphous polyester solution coating step, a drying step, and an optional laminating step and a stripping agent coating step. Hereinafter, an embodiment of the method of the present invention will be described with reference to FIG.

<Amorphous polyester solution coating process>
The amorphous polyester solution coating step means applying a solution of amorphous polyester to the first base material layer.

In one embodiment, as shown in FIG. 16, in the amorphous polyester solution coating step (310), the first base material layer is transferred from the delivery roll (312) to the amorphous polyester solution coating section (314). It can be done by moving with. This coating may be performed using, for example, a gravure roll or the like.

As the solution of the amorphous polyester, the amorphous polyester mentioned for the easily peelable layer can be used by dissolving it in a solvent component.

As the solvent component, ethyl acetate, methyl ethyl ketone, toluene, isopropyl alcohol, ethanol, methanol and the like can be used alone or in combination.

The concentration of the amorphous polyester in the solution of the amorphous polyester at the time of application can be 5% by mass or more, 7% by mass or more, or 10% by mass or more, and 40% by mass or less and 30% by mass or less. , Or 20% by mass or less.

The solution of the amorphous polyester by coating, remaining after evaporation of the solvent component in the following drying step, the amount of amorphous polyester, 4.0 g / ^{m 2} or less, 3.8 g / ^{m 2} or less, Alternatively, it can be 3.5 g / m ² or less, and can be 0.1 g / m ² or more, 0.3 g / m ² or more, or 0.5 g / m ² or more. This amount can be adjusted by adjusting the concentration of the amorphous polyester in the solution of the amorphous polyester and the coating amount of the solution of the amorphous polyester.

<Drying process>
The drying step means that the solution of the amorphous polyester is dried to form an easily peelable layer.

As shown in FIG. 16, the drying step (320) can be performed using, for example, a drying facility (322).

Examples of the drying equipment include a dryer and the like.

<Laminating process>
The laminating step means that the second base material layer is pressure-bonded to the easily peelable layer to be laminated.

As shown in FIG. 16, in the laminating step (330), for example, the second base material layer (6) is moved from the delivery roll (332) so as to overlap the easily peelable laminated body (10a), and then pressure-bonded. It can be done by letting.

<Release agent application process>
The release agent application step means applying the release agent to the second base material layer. This coating may be performed, for example, by gravure printing. As the release agent, the release agent mentioned for the release agent layer can be used.

The present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

[Evaluation of easily peelable laminate]
<< Preparation of laminate >>
<Examples 1-1 to 1-5>
Amorphous polyester A dissolved in a solvent (Byron ™ 55SS, Toyo Boseki Co., Ltd., Tg: -15 ° C.) was diluted with ethyl acetate so that the content of the amorphous polyester was 15% by mass. A solution of amorphous polyester was prepared. Then, on a polyethylene terephthalate (PET) film (“PET1”, PETB, Unitica Co., Ltd., thickness: 12 μm) as the first base material layer, a solid amount of 0.4 g / m ² was used using a bar coater. A solution of amorphous polyester was applied so that the portion remained, and the mixture was dried to remove the solvent, and an easily peelable layer was prepared. Next, a polyethylene terephthalate (PET) film (“PET2”, E5100, Toyobo Co., Ltd., thickness: 12 μm) as the second base material layer was pressure-bonded onto the easily peelable layer to make it easy in Example 1-1. A peelable laminate was prepared.

Next, a solution of amorphous polyester was applied, and the amount of solids containing amorphous polyester after the solvent was removed was 1.0 g / m ² , 1.8 g / m ² , 2.2 g / m ² , and 3. The easily peelable laminate of Examples 1-2 to 1-5 was prepared in the same manner as the easily peelable laminate of Example 1-1 except that the thickness was changed to ² g / m ² .

<Examples 2-1 to 2-5>
Amorphous polyester B (Byron ™ 50AS, Toyo Boseki Co., Ltd., Tg: 4 ° C.) was used as the amorphous polyester dissolved in the solvent, and a solution of the amorphous polyester was applied to remove the solvent. The solid content containing amorphous polyester was changed to 0.6 g / m ² , 1.0 g / m ² , 1.4 g / m ² , 2.1 g / m ² , and 2.9 g / m ^2. Except for this, the easily peelable laminate of Examples 2-1 to 2-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Examples 3-1 to 3-5>
Amorphous polyester C (Byron ™ GK-33AS, Toyo Boseki Co., Ltd., Tg: 16 ° C.) was used as the amorphous polyester dissolved in the solvent, and a solution of the amorphous polyester was applied to remove the solvent. After that, the solid content containing amorphous polyester was changed to 0.7 g / m ² , 1.1 g / m ² , 1.5 g / m ² , 2.1 g / m ² , and 3.2 g / m ² . Except for this, the easily peelable laminate of Examples 3-1 to 3-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Comparative Examples 1-1 to 1-5>
Amorphous polyester D (Byron ™ 20SS, Toyo Boseki Co., Ltd., Tg: 47 ° C.) was used as the amorphous polyester dissolved in the solvent, and a solution of the amorphous polyester was applied to remove the solvent. The solid content containing amorphous polyester was changed to 0.6 g / m ² , 0.8 g / m ² , 1.4 g / m ² , 2.0 g / m ² , and 2.7 g / m ^2. Except for this, the easily peelable laminate of Comparative Examples 1-1 to 1-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Comparative Examples 2-1 to 2-5>
Amorphous polyester E (Byron ™ GK-88ME, Toyo Boseki Co., Ltd., Tg: 84 ° C.) was used as the amorphous polyester dissolved in the solvent, and a solution of the amorphous polyester was applied to remove the solvent. The amount of solids containing amorphous polyester was changed to 0.5 g / m ² , 1.2 g / m ² , 1.7 g / m ² , 2.3 g / m ² , and 3.3 g / m ² . Except for this, the easily peelable laminate of Comparative Examples 2-1 to 2-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Examples 4-1 to 4-5>
Amorphous polyester F (Elitel ™ UE-3223-30EA, Unitica Co., Ltd., Tg: 4 ° C.) was used as the amorphous polyester dissolved in the solvent, and a solution of the amorphous polyester was applied to the solvent. The amount of solids containing amorphous polyester after skipping was 0.6 g / m ² , 1.0 g / m ² , 1.3 g / m ² , 1.8 g / m ² , and 2.9 g / m ² . Except for the modification, the easily peelable laminate of Examples 4-1 to 4-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Examples 5-1 to 5-5>
Amorphous polyester G (Elitel ™ XP-0109-30EA, Unitica Co., Ltd., Tg: 2 ° C.) was used as the amorphous polyester dissolved in the solvent, and a solution of the amorphous polyester was applied to the solvent. The amount of solids containing amorphous polyester after skipping was 0.5 g / m ² , 0.8 g / m ² , 1.4 g / m ² , 2.1 g / m ² , and 2.8 g / m ² . Except for the modification, the easily peelable laminate of Examples 5-1 to 5-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Comparative Examples 3-1 to 3-3>
Instead of the amorphous polyester solution, an aqueous one-component acrylic adhesive was used, the adhesive was applied, and the solid content after the solvent was removed was 1.0 g / m ² , 1.9 g / m ² , The easily peelable laminate of Comparative Examples 3-1 to 3-3 was prepared in the same manner as the easily peelable laminate of Example 1-1 except that the content was 2.7 g / m ² .

<Comparative Examples 4-1 to 4-5>
Instead of the amorphous polyester solution, a solvent-based two-component acrylic pressure-sensitive adhesive was used, the pressure-sensitive adhesive was applied, and the solid content after the solvent was removed was 0.5 g / m ² , 1.1 g / m ^2. , 1.4 g / m ² , 2.1 g / m ² , and 3.0 g / m ² , but in the same manner as the easily peelable laminate of Example 1-1, Comparative Examples 4-1 to 1 An easily peelable laminate of 4-5 was prepared.

<Comparative Examples 5-1 to 5-5>
Instead of the amorphous polyester solution, a two-component aliphatic ester adhesive was used, the adhesive was applied, and the solid content after the solvent was removed was 0.5 g / m ² and 0.9 g / m ^2. , 1.3 g / m ² , 2.0 g / m ² , and 2.9 g / m ² , but in the same manner as the easily peelable laminate of Example 1-1, Comparative Examples 5-1 to 5-1. An easily peelable laminate of 5-5 was prepared.

<Comparative Examples 6-1 to 6-5>
Instead of the solution of amorphous polyester, the main agent of the two-component aliphatic ester adhesive is used, the main agent is applied, and the solid content after the solvent is removed is 0.6 g / m ² , 0.9 g / m. Comparative Example 6-1 in the same manner as the easily peelable laminate of Example 1-1, except that the values were ² , 1.8 g / m ² , 2.1 g / m ² , and 2.7 g / m ^2. An easily peelable laminate of ~ 6-5 was prepared.

<Examples 6-1 to 6-5>
A nylon (Ny) film (Emblem ™ ON, Unitica Co., Ltd., thickness: 15 μm) was used as the second base material layer, a solution of amorphous polyester was applied, and the amorphous after the solvent was removed. Performed except that the solid content containing the polyester was changed to 0.5 g / m ² , 0.8 g / m ² , 1.7 g / m ² , 2.0 g / m ² , and 3.1 g / m ^2. The easily peelable laminate of Examples 6-1 to 6-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Examples 7-1 to 7-5>
As the first and second base material layers, Ny film (Emblem ™ ON, Unitica Co., Ltd., thickness: 15 μm) was used, a solution of amorphous polyester was applied, and amorphous after the solvent was removed. Performed except that the solid content containing polyester was changed to 0.4 g / m ² , 0.8 g / m ² , 1.5 g / m ² , 1.9 g / m ² , and 3.2 g / m ^2. The easily peelable laminate of Examples 7-1 to 7-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Examples 8-1 to 8-5>
As the second base material layer, a polyethylene (PE) film (H-500S, Aicello Corporation, thickness: 15 μm) is used, an amorphous polyester solution is applied, and the amorphous polyester after the solvent is removed. Example 1 except that the solid content containing is changed to 0.6 g / m ² , 0.9 g / m ² , 1.4 g / m ² , 2.2 g / m ² , and 2.8 g / m ^2. The easily peelable laminate of Examples 8-1 to 8-5 was prepared in the same manner as the easily peelable laminate of -1.

<Examples 9-1 to 9-5>
As the second base material layer, a soft aluminum (Al) foil (thickness: 6.5 μm) and a PET film (CB901, KOLON, thickness: 8 μm) are used as a two-component aliphatic ester adhesive (Takelac). A-525S / Takenate A-50, Mitsui Chemicals Co., Ltd.) was used so that the aluminum foil and the easily peelable layer were in contact with each other, and a solution of amorphous polyester was applied to remove the solvent. The amount of solids containing amorphous polyester was changed to 0.6 g / m ² , 0.8 g / m ² , 1.6 g / m ² , 2.1 g / m ² , and 3.1 g / m ² . Except for this, the easily peelable laminate of Examples 9-1 to 9-5 was prepared in the same manner as the easily peelable laminate of Example 1-1.

<Comparative Example 7>
An easily peelable resin obtained by kneading 95% by mass of low-density polyethylene (Petrosen 226, Toso Co., Ltd.) and 5% by mass of cyclic olefin copolymer (Apel 6013B, Mitsui Chemicals, Inc.) instead of a solution of amorphous polyester. With a PET film as a first base material layer (PETB, Unitika Co., Ltd., thickness: 12 μm) and a PET film as a second base material layer (E5100, Toyo Spinning Co., Ltd., thickness: 12 μm). The easily peelable resin was extruded between them and sand-laminated to prepare the easily peelable laminate of Comparative Example 7.

<Examples 10-1 to 10-3>
A release agent (Polycoat P-91, DIC Graphics) was applied to a polyethylene terephthalate (PET) film ("PET2", E5100, Toyobo Co., Ltd., thickness: 12 μm) as a second substrate layer, and a lamination density of 40. The easily peelable laminate of Example 10-1 was obtained in the same manner as in Example 1-2 except that the side to which the release agent was applied was pressure-bonded onto the easily peelable layer. Made.

The easily peelable laminates of Examples 10-2 and 10-3 were prepared in the same manner as in Example 10-1 except that the stacking densities of the release agent layers were changed to 60% and 80%.

《Evaluation》
<Evaluation of easy peelability>
Each of the prepared easily peelable laminates was cut into rectangular samples of 25 mm × 150 mm, and the second base material layer was peeled off by 35 mm from the short side to the long side. Next, the first base material layer side and the second base material layer side of the peeled portion are sandwiched between a pair of grippers facing each other of a measuring machine (Strograph VES1D, Toyo Seiki Seisakusho Co., Ltd.). A 180 ° peeling test was performed by peeling 180 ° under the conditions of a test speed of 300 mm / min and a peeling length of 35 mm, and the average peeling strength at a peeling length of 10 to 30 mm was determined.

<Evaluation of resealability>
The peeled first base material layer and the second base material layer of the sample after the 180 ° peeling test were overlapped and reciprocated once with a 2 kg roller to bond the peeled interfaces. Then, this sample was subjected to a 180 ° peeling test in the same manner as described above.

Next, the bonding and peeling were repeated three times, and the peeled first base material layer and the second base material layer were overlapped and reciprocated once with a 2 kg roller to bond the peeled interfaces. Then, this sample was subjected to a 180 ° peeling test in the same manner as described above.

In addition, a test in which the load applied by the rotary roll was changed to 4 kg was also performed in the same manner.

The results are shown in Tables 1-5.

Regarding the easy peeling property, from Tables 1 to 4, the easily peelable laminate of the example in which the amorphous polyester layer having a glass transition temperature of 25 ° C. or less was used as the easy peeling layer is the conventional easy peeling property. It can be understood that it has good peelability as in the easily peelable laminate of Comparative Example 7 using a resin. Further, the easily peelable laminate of the example in which a resin film or metal foil other than the PET film is used as the adherend surface with the easily peelable layer is also the same as the easily peelable laminate of Examples 1-1 to 5-5. It can be seen that it also has good peelability.

Regarding the resealability, from Tables 1 to 4, the easily peelable laminate of the example in which the amorphous polyester layer having a glass transition temperature of 25 ° C. or less was used as the easily peelable layer causes stickiness. It can be understood that it has good resealing property without any problem.

Further, from Table 5, it is possible to reduce the values of the initial strength and the reseal strength by laminating the release agent layer, and it is possible that these values become smaller as the stacking density of the release agent layer increases. Let's understand.

[Evaluation of lid material]
<< Preparation of lid material >>
<Example 11>
The materials shown below were prepared:
Coated paper (basis weight: 80 g / m ² ): Ryuo Coat, Daio Paper Co., Ltd. PET (thickness: 12 μm): E5100, Toyobo Co., Ltd. Release agent layer: Polycoat P-91, DIC Graphics Co., Ltd. Easy peeling layer: Byron (trademark) 55SS, Toyobo Co., Ltd. PET (thickness: 8 μm): CB901, KOLON aluminum foil (thickness: 6.5 μm): soft aluminum dry laminate adhesive: Takelac A-620 / Takenate A-65, Mitsui Chemical Co., Ltd. Sealant layer: CMPS (trademark) VN503, Mitsui / Dupont Polychemical

The laminate obtained in this example was paper (basis weight: 80 g / m ² ) // PET (12) / release agent layer / easily peelable layer (1.0 g) / PET (8 μm) // AL (6). It had a layer structure of .5 μm) / sealant (20 μm) (where "//" represents a dry laminate adhesive).

1. 1. Using a dry laminator, set the application amount of the dry laminate adhesive to a dry weight of 2.5 g / m ² or more, and apply the paper and PET film "E5100" to the dry laminate adhesive "Takelac A-620 / Takenate A-65". A member a (paper (basis weight: 80 g / m ² ) // PET (12 μm)) as the second base material layer was obtained by adhering through the above. Further, the release agent "Polycoat P-91" was applied to the planned tab formation portion on the PET side of the member a.
2. 2. Using a dry laminator, set the application amount of the dry laminate adhesive to a dry weight of 2.5 g / m ² or more, and apply the aluminum foil and PET film "CB901" to the dry laminate adhesive "Takelac A-620 / Takenate A-". By adhering through "65", a member b (PET (8 μm) // AL (6.5 μm)) as a first base material layer was obtained.
3. 3. Amorphous polyester "Byron (trademark) 55SS" as an easily peelable layer dissolved in a solvent is diluted with ethyl acetate so that the content of the amorphous polyester is 15% by mass, and the amorphous polyester is prepared. A solution was prepared. Using a dry laminator, the coating amount was set to a dry weight of 1.5 g / m ² or less, and the solution of this amorphous polyester was applied to the PET film "CB901" side of the member b, and the member a was applied here. The PET film "E5100" side of the above was crimped to obtain a laminated film c.
4. Using an extruded laminator, the film thickness was set to 20 μm, and “CMPS ™ VN503” as a sealant layer was extruded on the aluminum foil side of the member c to obtain a laminated film d.
5. A rotary die cutter was used to engrave an inner half-cut for opening and an inner half-cut for peeling at a depth from the sealant layer of the laminated film d to the easily peelable layer, and the outer peripheral edge of the lid was fully cut to obtain a lid material. ..

<Example 12>
The lid material of Example 12 was produced in the same manner as in Example 11 except that the release agent was not applied. The laminate obtained in this example was paper (basis weight: 80 g / m ² ) // PET (12) / easily peelable layer (1.0 g / m ² ) / PET (8 μm) // AL (6. It had a layer structure of 5 μm) / sealant (20 μm) (where "//" represents a dry laminate adhesive).

The lid materials of Examples 11 and 12 were placed on the flange portion of a polystyrene container (square shape, short side length 171 mm, long side length 233 mm, height 57 mm, flange width 7 mm, pouring amount 820 ml) at 120 ° C., 65 kg. It was heat-sealed under the condition of 0.7 seconds. Ten containers each of which the lid materials of Example 11 and Comparative Example 8 were heat-sealed were similarly prepared and evaluated.

《Evaluation》
The heat-sealed lid material was opened by hand, and the peeled state was visually observed. When peeling occurs at the interface between the easily peelable layer and PET and an opening appears, ○, when peeling at the interface between the sealant layer and the flange of the container without peeling at the interface between the easily peelable layer and PET Was set to x.

The results are shown in Table 6.

From Table 6, the lid material of Example 11 having the release agent layer was better peeled off at the interface between the easily peelable layer and PET as compared with the lid material of Example 12 having no release agent layer. Can be understood.

In Example 12, the reason why the easily peelable layer and PET were not peeled off well was that they were exposed to high temperature and high pressure by heat sealing, and that the high temperature and high pressure were concentrated in a narrow region. It is considered that this is because the peel strength is increased due to the above. However, considering the results of Examples 10-1 to 10-3, it can be naturally understood that the peel strength can be reduced by laminating the release agent layer by adjusting the stacking density.

2 First base material layer 2a Outer layer half cut line 4 Easy peeling layer 6 Second base material layer 6a Inner layer half cut line for opening 6b Opening 6c For peeling trigger (inner layer) Half cut line 8 Release agent layer 10a, 10b 10c, 10d Easy-to-peel laminate 14a, 14b Grip 20 Container 40a, 40b, 50a, 50b Lid material 42 Scheduled peeling part 44, 54 Opening tab 16, 46, 56, 256 Peeling tab 100a, 100b, 200a , 200b, 250a, 250b Packaging bag 102, 202 Peripheral seal part 104 Cut guide part 104a Scheduled tear line 202a Side edge seal part 202b, 254a, 254b Edge seal part 204 Extension part 252 Back seal part 300 Easy-to-peel laminate Manufacturing method 310 Coating process 312, 332 Feeding roll 314 Acrylic polyester solution coating part 320 Drying process 322 Drying equipment 330 Laminating process 334 Winding roll

Claims (15)

An easily peelable laminate comprising a first base material layer and an easily peelable layer existing on the first base material layer.
The easily peelable layer is an amorphous polyester layer having a glass transition temperature of 25 ° C. or lower.
It further includes a second base material layer that is present on the side of the easily peelable layer where the first base material layer does not exist.
The second base material layer is a single resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. Is in contact with
The resin layer of the second base material layer is a polyethylene terephthalate film (PET) or a nylon film (Ny), and
After peeling the first base material layer from the second base material layer, when the second base material layer and the first base material layer are pressure-bonded, the seal can be resealed.
Easy-to-peel laminate. The easily peelable laminate is cut into a rectangle of 25 mm × 150 mm, and the second base material layer is separated from the first base material layer from the short side to the long side at 300 mm / min and the peel length is 35 mm. The easily peelable laminate according to claim 1 , wherein the average peeling strength at a peeling length of 10 to 30 mm is 0.3 N / 25 mm to 4.5 N / 25 mm when peeled by 180 ° under the above conditions. The easily peelable laminate according to claim 1 or 2 , wherein the easily peelable layer is present in an amount of 4.0 g / m ² or less. The easily peelable laminate according to any one of claims 1 to 3 , wherein the amorphous polyester has a glass transition temperature of −50 ° C. or higher. The item according to any one of claims 1 to 4 , wherein the amorphous polyester has a number average molecular weight of 100,000 or less as measured by gel permeation chromatography using a tetrahydrofuran solvent and polystyrene standard. The easily peelable laminate described. The first and / or the second base material layer further includes a sealant layer as a layer which is not in contact with the easily peelable layer of the outermost layer, according to any one of claims 1 to 5. The easily peelable laminate described. The easily peelable laminate according to any one of claims 1 to 6 , wherein the first and / or second base material layer has a half-cut line. It further includes a second base material layer that is present on the side of the easily peelable layer where the first base material layer does not exist.
The second base material layer is a single resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. Is in contact with
It has a peeling tab for peeling the second base material layer from the easily peelable layer, and the peeling tab of the second base material layer and the easily peelable layer It has a release agent layer in at least a part of the area between them.
The easily peelable laminate according to any one of claims 1 to 7 . It further includes a second base material layer that is present on the side of the easily peelable layer where the first base material layer does not exist.
The second base material layer is a single resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. Is in contact with
It has a peeling tab for peeling the second base material layer from the easily peelable layer.
The peeling tab and the other portion of the easily peelable laminate are defined by a peeling trigger half-cut line engraved from the first base material layer side or the second base material layer side. A release agent layer is provided between the second base material layer and the easily peelable layer so as to surround the peeling trigger half-cut line.
The easily peelable laminate according to any one of claims 1 to 7 . A lid material having the easily peelable laminate according to any one of claims 1 to 9 . A lid material for instant foods
It further includes a second base material layer that is present on the side of the easily peelable layer where the first base material layer does not exist.
The second base material layer is a single resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. Is in contact with
One of the first and second base material layers is an inner layer, and the other is an outer layer.
The inner layer includes an inner layer half-cut line for opening that exists so as to define a part of the area of the inner layer, and when the outer layer is peeled from the inner layer, a part of the inner layer. Region is separated from the other part of the inner layer together with the outer layer to form an opening in the inner layer.
The lid material according to claim 10 . A packaging bag having the easily peelable laminate according to any one of claims 1 to 9 . It is a packaging bag with contents
The easily peelable layer further includes a second base material layer existing on the side where the first base material layer does not exist, and the second base material layer is simply. It is a laminate having at least a resin layer or a metal layer which is a layer, or a resin layer or a metal layer, and the resin layer or the metal layer is in contact with the easily peelable layer.
One of the first and second base material layers is an inner layer, and the other is an outer layer.
The inner layer includes an inner layer half-cut line for opening that exists so as to define a part of the area of the inner layer, and when the outer layer is peeled from the inner layer, a part of the inner layer. Region is separated from the other part of the inner layer together with the outer layer to form an opening in the inner layer.
The packaging bag according to claim 12 . Applying a solution of amorphous polyester to the first substrate layer ,
The solution of the amorphous polyester is dried to form an easily peelable layer, and
The easily peelable layer includes crimping a second base material layer .
The amorphous polyester may have a glass transition temperature of 25 ° C. or less,
The second base material layer is a single resin layer or metal layer, or a laminate having at least a resin layer or a metal layer, and the resin layer or the metal layer is the easily peelable layer. And is in contact with
The resin layer of the second base material layer is a polyethylene terephthalate film (PET) or a nylon film (Ny).
A method for producing an easily peelable laminate. The method according to claim 14 , further comprising applying a release agent to the second base material layer.

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