JPH06238832A - Laminate product - Google Patents

Abstract

PURPOSE:To obtain a lminate product generating no thermal deformation and excellent in matting effect and thermal bonding strength by thermally bonding the thermal adhesive layer of a surface roughened laminated film to a base material by a surface roughened roll whose center line average roughness is a specific value or more. CONSTITUTION:A laminate product 1 is produced by laminating a surface roughened laminated film 2 and a base material 6 by a thermal press bonding method. That is, the surface roughened laminated film 2 and the base material 6 are passed through the nip of a heated surface roughened roll 7 whose center line average roughness (Ra) is 0.08mum or more and the pressure roll 8 being in contact with the roll 7 in such a state that the surface of the base material 6 and the thermal adhesive layer 5 of the film 2 are brought into contact with each other to be laminated under heating and pressure. At this time, heating temp. is pref. set so as not to deform the base material or the surface roughened laminated film and the applied pressure is set, for example, to 10-70kg/cm as line pressure but there is no special limit. The laminate product thus produced does not generate thermal deformation and the smoothing and delamination of a roughened surface layer generated in a conventional product thermally bonded by a mirror surface roll and is excellent in matting effect and bonding strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which a surface-roughened film and a substrate such as printed paper are laminated by thermocompression bonding using a surface-roughening roll without using an adhesive. The present invention relates to the provision of laminated products having excellent matte properties.

[0002]

2. Description of the Related Art Conventionally, a laminated product having excellent mattness has been produced by coating an olefin such as ethylene-propylene random copolymer, ethylene-propylene block copolymer, high density polyethylene or low density polyethylene on one side of a base film. Laminating a roughened film composed of a system resin and a mixture thereof, and using a roughened laminated film having a configuration in which a heat-sensitive adhesive layer is applied to the other surface, the heat-sensitive adhesive layer and the substrate. It was obtained by thermocompression bonding using a mirror surface roll.

[0003]

However, the conventional laminated product is easily deformed by heat because the heat-sensitive adhesive layer of the roughened laminated film and the substrate are thermocompression bonded by using a mirror surface roll, The roll tends to smooth the roughened surface layer, making it difficult to obtain an excellent matting effect.
In order to prevent thermal deformation and smoothing of the roughened surface layer, thermocompression bonding is performed at a temperature as low as possible, so that the adhesive strength with the substrate is often lowered.

[0004]

[Means for Solving the Problems] The inventors of the present invention have arrived at the present invention as a result of extensive studies in order to obtain a laminated product which is free from the above-mentioned thermal deformation and has an excellent matting effect and thermal adhesive strength.

A feature of the present invention is that the heat-sensitive adhesive layer of the roughened laminated film in which one surface of the substrate film is a roughened surface layer and the other surface is a heat-sensitive adhesive layer, the center line average roughness is The point is to provide a laminated product having a structure in which the substrate is thermocompression bonded with a roughening roll having a degree (Ra) of 0.08 μm or more. Further, one side of the substrate film has a center line average roughness (Ra). ) Is 0.08μ or more, and ten-point average roughness (Rz)
Is 1.0μ or more, and the surface glossiness at 60 degrees is 60%
The heat-sensitive adhesive layer of the roughened laminated film having the following roughened surface layer and the other surface being the heat-sensitive adhesive layer is formed by a roughening roll having a center line average roughness (Ra) of 0.08 μm or more. The present invention is to provide a laminated product having a constitution in which it is thermocompression-bonded with a material, and further, one surface of the base film has a structure in which one surface is roughened, and the other surface is the opposite surface (the opposite surface is roughened). The heat-sensitive adhesive layer surface of the roughened laminated film provided with a heat-sensitive adhesive layer (which may be smooth or smooth) has a center line average roughness (Ra) of 0.08 μ or more. And to provide a laminated product having a thermocompression bonded structure.

The resin constituting the substrate film according to the present invention is not particularly limited, but generally, a resin whose melting point peak (measured by DSC) is 150 ° C. or higher can be exemplified. , Specifically polypropylene resin,
Examples thereof include ethylene-propylene copolymers, ethylene-propylene block copolymers, polyester-based polymers, polyamide-based polymers and the like, and mixtures thereof.
At this time, if necessary, high, medium, low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (E
EA), ethylene-acrylic acid copolymer (EAA), petroleum resin and the like may be mixed, and there is no particular limitation. Further, as the resin that constitutes the base film having a structure in which one surface is roughened, the above-mentioned resin and the resin that forms a roughened surface layer described later can be exemplified, but this is also the case. There is no particular limitation.

The resin for forming the surface-roughened surface layer according to the present invention is not particularly limited, but generally, a resin containing 50% by weight or more of a resin having a melting point peak of 80 ° C. or higher and 150 ° C. or lower. It can be illustrated. Specifically, polypropylene resin, ethylene-propylene copolymer, ethylene-propylene block copolymer, high, medium, low density polyethylene,
Linear low density polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA)
Alternatively, a graft copolymer obtained by graft-polymerizing an unsaturated carboxylic acid (for example, maleic acid, acrylic acid) or an anhydride or derivative of the acid, a polyamide resin such as 6-nylon or 12 nylon, and the like. The mixture of can be illustrated. It is sufficient that at least the surface of such a surface-roughened layer is roughened, and the surface-roughened surface layer can be roughened without any special treatment by selecting the resin to be used. However, if necessary, the surface may be roughened by various post-treatments such as embossing roll and chemical treatment, and the roughening means is not particularly limited.

As the resin for forming the heat-sensitive adhesive layer according to the present invention, for example, various polyolefin resins, polyolefin resins and graft copolymers obtained by graft-polymerizing unsaturated carboxylic acid and its acid derivative Examples thereof include a coalesced product, a mixture with a petroleum resin and the like, a polyamide resin and a polyester resin, etc., but they may be appropriately selected in consideration of the thermal adhesiveness to the substrate to be laminated and are not particularly limited.

Examples of the base material which is thermocompression-bonded to the surface-roughened laminated film according to the present invention include paper, plastic film, synthetic paper, flooring material, metal, etc., and the heat-sensitive adhesive layer of the surface-roughened laminated film. If it can be thermocompression bonded,
There is no particular limitation. At this time, paper, plastic film,
The base material such as synthetic paper may or may not be printed.

The surface-roughening roll according to the present invention may be surface-roughened by an appropriate method (for example, an etching method or the like), and the degree of surface-roughening has a center line average roughness (Ra) of 0.0.
8μ or more is necessary, preferably 1.0μ or more, more preferably 1.5μ or more. When the center line average roughness (Ra) is less than 0.08 μ, it is close to a mirror surface roll, which is not preferable in many cases.

The roughness of the surface-roughened surface layer in the surface-roughened laminated film according to the present invention is the center line average roughness (R
a) can be 0.08 μm or more, and more preferably 0.
An example is 10 μm or more. Also, ten-point average roughness (Rz)
Can be 1.0 μ or more, more preferably 1.5 μ
The above can be illustrated. Further, the surface gloss of the roughened surface layer at 60 degrees can be 60% or less, more preferably 50% or less. However, the centerline average roughness (R
The values of a), the ten-point average roughness (Rz), and the surface glossiness are not particularly limited, and needless to say, values other than the above values are within the scope of the present invention. In addition, the same applies to the case where at least one surface of the base film itself is roughened without the roughened surface layer according to the present invention. In the present invention, the centerline average roughness (Ra)
The ten-point average roughness (Rz) is the roughness measured by JISB-0601 and obtained at a cutoff value of 2.5 mm, and the surface glossiness is a numerical value measured by JISZ-8741 and is matte. The smaller the number, the better the effect.

The film forming method of the roughened laminated film will be described in detail below, but this is only an example and the present invention is not limited to this. At least three extruders are attached to the coextrusion die, and one extruder is supplied with a material that blends the resin forming the base film 4 and, if necessary, additives, and the other one. The extruder is supplied with a resin for forming the roughened surface layer 3 described above, and if necessary, a material blended with an additive, etc., and the thermosensitive adhesive layer 5 described above is formed in another extruder. The resin, and if necessary, a blended material with additives were supplied. Next, each extruder was heated to melt and knead each material, and the laminated film was extruded from the coextrusion die. The extruded laminated film is preferably cooled and solidified, and then stretched in the longitudinal direction and / or the transverse direction at a temperature suitable for stretching the laminated film to an appropriate ratio, but there is no particular limitation. At this time, in the laminated film in this example, the intermediate layer had a substrate film 4, one surface had a roughened surface layer 3, and the opposite surface had a heat-sensitive adhesive layer 5. Furthermore,
When the adhesive force between the layers is weak, an adhesive resin may be interposed between the layers to form a laminated film having three or more layers, and there is no particular limitation to this.

The above is one example of the method for forming the roughened laminated film 2 by the coextrusion method.
May be formed by a method other than this, for example, a base film 4 and a film forming the roughened surface layer 3 and / or a heat-sensitive adhesive film forming the heat-sensitive adhesive layer 5 described above. Separately formed, the substrate film 4 is a surface layer or an intermediate layer, if necessary, one surface thereof is a film forming the roughened surface layer 3, and the other one surface is a film 5 having a heat-sensitive adhesive property. Alternatively, they may be laminated by an appropriate method such as an extrusion laminating method or a dry laminating method. Furthermore,
When the adhesive force between the layers is small, an adhesive resin may be interposed between the layers, and this is not particularly limited.

Further, according to the present invention, the surface of the film having heat-sensitive adhesiveness obtained by roughening one surface is opposite to the roughened one surface (this opposite surface may be roughened). Center line average roughness (Ra) 0.
The point is to provide a laminated product which is thermocompression-bonded to a substrate by a roughening roll having a grain size of 08 μ or more. At this time, as the resin for forming the film having heat-sensitive adhesiveness in which one surface is roughened, the resin for forming the roughened surface layer described above can be heat-bonded to the substrate, Examples of the resin and the like that form the heat-sensitive adhesive layer are not particularly limited. The roughening means may be the same as the roughened surface layer described above,
There is no particular limitation. A film having heat-sensitive adhesiveness may be formed by an appropriate method. For example, the resin may be melt-kneaded and extruded with an extruder equipped with a T die or a ring die, and if necessary, formed. For example, a method of stretching in the machine direction and / or the transverse direction can be exemplified, and there is no particular limitation. The roughened surface of the heat-sensitive adhesive film having one surface roughened as described above has a center line average roughness (R
Regarding a), the ten-point average roughness (Rz) and the surface glossiness, the values in the same range as the above-mentioned roughened surface layer can be exemplified, but it goes without saying that values other than these values are also within the range of the present invention. .

In order to produce the laminated product 1 according to the present invention, the roughened laminated film (may be a roughened film having heat-sensitive adhesive property) 2 obtained above and the substrate 6 described above are used. A method of laminating by a thermocompression bonding method can be exemplified. Specifically, the surface of the base material 6 and the roughened laminated film 2
The heated surface-roughening roll 7 having a center line average roughness (Ra) of 0.08 μm or more so as to be in contact with the heat-sensitive adhesive layer 5.
It is possible to exemplify a method of laminating by passing between a pressure roll (for example, a metal roll covered with rubber) 8 in contact with the roll and heating and pressing. At this time, the heating temperature is preferably a temperature at which the substrate or the roughened laminated film is not deformed, and the pressure to be applied is a linear pressure of 10 to 70 k.
Although g / cm can be exemplified, it may be outside the above range as long as deformation of the laminated product, peeling of the laminate, deterioration of matting effect, etc. do not occur, and there is no particular limitation. Laminated products laminated by the above method do not have thermal deformation, smoothing of the roughened surface layer, peeling of laminating, etc. like those heat-bonded with a conventional mirror surface roll, matte effect, adhesive strength Etc. are excellent.

The laminated product according to the present invention is not particularly limited, and examples thereof include a printed laminated product, a packaging material having an excellent erasing effect, and synthetic paper, and there is no particular limitation.

The present invention will be described below based on examples.

[0018]

【Example】

Example 1 On one side of a base film (intermediate layer) 4 made of polypropylene having a melting point peak of 160 ° C., 70% by weight of polypropylene, 10% by weight of high density polyethylene and an ethylene-vinyl acetate copolymer (vinyl acetate content: 15% by weight) 20% by weight of a roughened surface layer 3 and a heat sensitive adhesive layer 5 made of low density polyethylene on the other side, and the thickness composition ratio is roughened surface layer 3 / base film 4 / heat sensitive adhesive Layer 5 = 1 /
A laminated film was obtained by a coextrusion method so as to have a thickness of 7/3. Then, the laminated film is longitudinally (machine direction) 1
The film was stretched 5 times at 50 ° C. and 10 times in the transverse direction (perpendicular direction) at 150 ° C. to obtain a roughened laminated film 2 having a total thickness of 30 μ. Roughened surface layer 3 of the obtained roughened laminated film 2
Had a center line average roughness (Ra) of 0.12 μ, a ten-point average roughness (Rz) of 1.8 μ, and a surface glossiness at 60 degrees of 40%. The surface-roughened laminated film 2 has a heat-sensitive adhesive layer 5 having a center line average roughness (Ra) of 0.1 μ and a surface-roughened roll 7 on which printed paper 6 (surface glossiness at 60 degrees is 10).
%) Printed surface and linear pressure 35 kg / cm, speed 20 m / mi
The surface roughening roll temperature was changed to 110 degrees, 120 degrees, and 130 degrees with n to obtain a thermocompression-bonded laminated product 1. Table 1 shows the adhesive strength, surface glossiness, and curl of the obtained laminated product (print laminated product).

Example 2 A roughened surface layer 3 made of a mixture of 40% by weight of ethylene-propylene random copolymer and 60% by weight of polypropylene on one side of a base film (intermediate layer) 4 made of polypropylene having a melting point peak of 160 ° C. , A heat-sensitive adhesive layer 5 made of low-density polyethylene on the other side, and the thickness composition ratio is roughened surface layer 3 / base film 4 / heat-sensitive adhesive layer 5 = 1/7/3
To obtain a laminated film by a coextrusion method. Then, the laminated film is longitudinally (machine direction) at 150 ° C.
5 times, and 10 times in the transverse direction (right angle direction) at 150 ° C. to obtain a roughened laminated film 1 having a total thickness of 30 μm. The roughened surface layer 3 of the obtained roughened laminated film 1 has a center line average roughness (Ra) of 0.04 μ, a ten-point average roughness (Rz) of 0.06 μ, and a surface glossiness at 60 degrees. Is 90%
Met. In the roughened laminated film 1, the heat-sensitive adhesive layer 5 is printed by the roughening roll 7 having the center line average roughness (Ra) of 0.1 μ and the printed paper 6 (the surface glossiness at 60 degrees is 10).
%) Printed surface, linear pressure 35 kg / cm, speed 20 m / m
The surface roughening roll temperature is 110 degrees, 120 degrees, and 130 in
The laminated product 1 thermocompression-bonded was obtained at different temperatures. Table 1 shows the adhesive strength, surface glossiness and curl of the obtained laminated product 1 (print laminated product).

Comparative Example 1 The heat-sensitive adhesive layer 5 of the roughened laminated film 2 obtained in Example 1 was printed with a roughening roll 7 having a center line average roughness (Ra) of 0.06 μ. Printed surface (10% surface gloss at 60 degrees), linear pressure 35 kg / cm, speed 20 m
/ Min, the roughening roll temperature is 110 degrees, 120 degrees, 1
The laminated product 1 which was thermocompression-bonded was changed to 30 degrees.
The obtained laminated product 1 (print laminated product)
Table 1 shows the adhesive strength, surface glossiness, and curl property of the above. At this time, the adhesive strength is the peel strength when a test piece having a width of 15 mm is peeled by 180 degrees. Surface gloss is JIS-Z87
41 is the measured value of the surface glossiness at 60 degrees, and the smaller the value, the better the erasability. Curling is a condition where there is almost no deformation of the Lamineto product and there is no bending, △
Slightly deformed but practically unproblematic, X indicates severely deformed and practically impaired.

[0022]

[Table 1]

As is clear from Table 1, the centerline average roughness (Ra) of 0.0 was obtained using the surface-roughened laminated film of the present invention.
Laminated products that are thermocompression-bonded with a roughening roll of 8μ or more have excellent mattness (low surface gloss) and are laminated at a temperature (120 ° C or higher) exceeding the general laminating temperature (95 to 110 ° C). However, since thermal deformation (curl property) is not recognized, it is possible to laminate at a high temperature (120 ° C. or higher), and it is possible to obtain a laminated product having high adhesive strength.

[0024]

EFFECT OF THE INVENTION The laminated product of the present invention has a matting effect and adhesive strength superior to those of conventional laminated products obtained by using a mirror-finished roll, and further, curling phenomenon is hardly recognized. Laminated products,
It is suitable for packaging materials and synthetic paper.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a print laminated product that is an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a method for manufacturing a print laminate product which is one embodiment of the present invention.

[Explanation of sign]

 1 Laminated Product 2 Roughened Laminated Film 3 Roughened Surface Layer 4 Base Film 5 Heat-sensitive Adhesive Layer 6 Base Material 7 Roughening Roll

Claims (4)

[Claims] 1. The center line average roughness (Ra) of the heat-sensitive adhesive layer of the roughened laminated film in which one surface of the substrate film is a roughened surface layer and the other surface is a heat-sensitive adhesive layer is 0. A laminated product having a structure in which it is thermocompression-bonded to a base material by a roughening roll of 08 μ or more. 2. One surface of the substrate film has a center line average roughness (Ra) of 0.08 μm or more, a ten-point average roughness (Rz) of 1.0 μm or more, and a surface glossiness at 60 °. The heat-sensitive adhesive layer of the roughened laminated film having a roughened surface layer of 60% or less and the other surface of which is a heat-sensitive adhesive layer has a center line average roughness (Ra) of 0.08 μ or more. Laminated product characterized in that it is thermocompression bonded to the base material. 3. A heat-sensitive adhesive layer surface of a roughened laminated film, comprising a substrate film having a structure in which one surface is roughened, and a heat-sensitive adhesive layer is provided on the opposite surface of the roughened one surface. , A laminated product thermocompression-bonded to a base material by a roughening roll having a center line average roughness (Ra) of 0.08 μm or more. 4. A film having a heat-sensitive adhesive property obtained by roughening one surface has a center line average roughness (Ra) of 0.08 μm or more on a surface opposite to the roughened one surface. Laminated product that is thermocompression-bonded to the base material by the surface roll.