JP2010155343A - Dry lamination method and laminate obtained thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dry lamination method for allowing a laminate obtained thereby to have excellent external appearance, and the laminate obtained by the dry lamination method. <P>SOLUTION: The dry lamination method comprises the steps of: coating a film with an adhesive having ≥35 mass% solid content diluted by a solvent by a gravure method; volatilizing the solvent; and sticking another film to the adhesive-coated film to obtain the laminate. The film is coated with the adhesive by using a gravure printing plate engraved by an electronic engraving machine having 120-140° stylus angle and 100-270 lines/inch number of gravure lines. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dry lamination method and a laminate obtained by the method.

  Conventionally, a method of bonding various plastic films, a method of bonding a plastic film and a plastic film on which a metal is vapor-deposited, or a method of bonding a plastic film and a metal foil has been conventionally performed by a dry laminating method. In the dry laminating method, an adhesive diluted with a solvent such as an organic solvent or water is applied to a base material, and then the solvent is volatilized with a dryer and bonded to the other base material while applying heat and pressure. Is the method.

  As an adhesive used in the dry laminating method, for example, a two-component curable organic solvent type adhesive obtained by blending a polyisocyanate compound in a solution in which a resin containing a hydroxyl group such as a polyester resin or a polyurethane resin is dissolved in an organic solvent. Many agents are used.

However, since the organic solvent-type adhesive contains a large amount of organic solvent, the dry laminating method using the organic solvent-type adhesive has many problems such as environmental pollution due to exhaust, risk of fire explosion, and sanitary obstruction of work environment. I have it. Since the conventional organic solvent type adhesive is applied to a substrate with a solid content of 30% by mass or less, a large amount of organic solvent is released to the outside when the organic solvent is volatilized after the adhesive is applied. Therefore, a high solid content high solid adhesive with a reduced content of organic solvent has been proposed (see Patent Document 1).

However, such a high solid type adhesive has a uniform pattern on the surface of the laminated body after lamination in the dry laminating method using the conventional gravure method, resulting in a uniform pattern. There was a problem that it was difficult to achieve a good finish because the appearance was not obtained.

In recent years, the demand for removing organic solvents from adhesives has become stronger due to demands for improving the work environment, strengthening the Fire Service Act, and regulating the release of VOC (volatile organic compounds) into the atmosphere, making the adhesive water-based. A dry laminating method using a water-based adhesive has been proposed. The dry laminating method using a water-based adhesive improves the working environment, disaster prevention problems, and problems such as VOC release into the atmosphere, but new problems arise due to its water-based properties. To do. That is, there is a problem that a streaky pattern is formed on the surface of the laminated body after lamination due to poor wetting of the plastic substrate due to the high surface tension of water, and a good appearance cannot be obtained. It was.
JP 2005-298588 A

  An object of the present invention is to provide a dry laminating method in which the appearance of a laminated body after lamination is good and a laminated body obtained thereby.

  As a result of various studies to solve the above problems, the inventors of the present invention have determined the stylus angle and gravure of a gravure plate engraved with an electronic engraving machine when applying an adhesive having a solid content of 35% by mass or more by a gravure method. By selecting the number of lines, it was found that the appearance of the laminated body after lamination was improved regardless of the organic solvent type adhesive and the aqueous adhesive, and the present invention was completed.

  In the present invention, (1) an adhesive having a solid content of 35% by mass or more diluted with a solvent is applied to a film by a gravure method, then the solvent is volatilized, and another film is laminated to obtain a laminate. In a laminating method, the present invention relates to a dry laminating method in which the adhesive is applied using a gravure plate engraved with an electronic engraving machine having a stylus angle of 120 to 140 ° and a gravure line number of 120 to 270 lines / inch. .

  The present invention also relates to (2) the dry laminating method as described in (1) above, wherein the adhesive is an organic solvent-type adhesive or an aqueous adhesive.

  The present invention also relates to (3) a laminate obtained by the dry laminating method described in (1) or (3).

  ADVANTAGE OF THE INVENTION According to this invention, the external appearance of the laminated body after a lamination can provide the dry lamination method and the laminated body obtained by it which can be finished in the uniform surface without a streak or a yuzu skin-like pattern, and without being rubbed. .

  In the dry laminating method of the present invention, an adhesive having a solid content of 35% by mass or more diluted with a solvent is applied to a film by a gravure method, and then the solvent is volatilized and bonded to another film to obtain a laminate. In the dry laminating method, the adhesive is applied using a gravure plate engraved with an electronic engraving machine having a stylus angle of 120 to 140 ° and a gravure number of 120 to 270 lines / inch.

  In the present invention, it is important to use a gravure plate engraved with an electronic engraving machine having a stylus angle of 120 to 140 ° and a gravure line number of 120 to 270 lines / inch. The appearance of the laminate is improved.

  In the conventional dry laminating method, when an adhesive having a solid content of 30% by mass or less was applied, a good appearance was obtained without specifying the number of lines and the shape of the gravure plate, but the solid content was 35% by mass or more. When the adhesive is applied, the laminated body after lamination cannot obtain good appearance quality unless an appropriate number and shape of gravure plates are selected. When applying an adhesive with a high solid content, since the solvent content in the adhesive is low, the adhesive does not level on the film after the adhesive is applied to the film. A streak-like pattern is generated along the cell shape, and good appearance quality cannot be obtained. On the other hand, a gravure plate with a high number of lines has a small cell volume, so a sufficient amount of coating cannot be secured, adhesion performance is poor, and a rubbing pattern is generated on the coated surface, resulting in good appearance quality. Can't get. The higher the number of gravure lines on the gravure plate, the better the appearance quality can be obtained because the adhesive can be applied uniformly, but on the other hand, if the number of lines is high, the cell volume will be reduced, so the coating amount Can not be secured, the adhesive performance is poor.

  The dry laminating method of the present invention has an adhesive performance when an adhesive having a solid content of 35% by mass or more is used by setting the stylus angle and the number of gravure lines of a gravure plate engraved with an electronic engraving machine to a specific range. The laminate after lamination is excellent, and a good appearance can be obtained.

  The gravure plate used in the present invention is a plate engraved with an electronic engraving machine. Electronic engraving machines include German-made helio, American-made ohio, and Japanese-made barcass, but the most representative is helio. The gravure plate engraved with an electronic engraving machine has a different shape from the engraving plate by rolling and the corrosion plate by the corrosion method, and has a wide opening of the cell (concave part) and a so-called “bank” part between the cells. Therefore, even when a high solid content adhesive is applied to the film, the adhesive is well leveled on the film.

  The number of gravure lines of the gravure plate used in the method of the present invention is 120 to 270 lines / inch, preferably 135 to 255 lines / inch. When the number of gravure lines is less than 120 lines / inch, a streak-like pattern is generated along the coating flow direction, and a good appearance quality cannot be obtained in the laminated body after lamination. If it exceeds 270 lines / inch, a sufficient coating amount cannot be secured, the adhesion performance becomes poor, or a rubbing pattern is produced on the coated surface, so that good appearance quality cannot be obtained.

  Moreover, the stylus angle of the gravure plate used in the method of the present invention is 120 to 140 °, preferably 120 to 130 °. When the stylus angle is less than 120 °, a streak-like pattern is generated along the flow direction of the coating, and the laminated body after lamination cannot obtain a good appearance quality, and the cutting edge of the diamond blade (stylus) Since durability is inferior and deteriorates immediately during plate making, it is disadvantageous in terms of cost. If it exceeds 140 °, the depth of the gravure plate cell becomes shallow, so a sufficient amount of coating cannot be secured, the adhesion performance becomes poor, or the rubbing pattern is generated on the coated surface, resulting in good appearance quality. I can't get it.

  The stylus angle refers to the angle of the tip of a gravure plate cell (concave portion). The cell is produced by engraving an inverted pyramid on the surface of a metal gravure plate cylinder with a diamond blade (stylus) of an electronic engraving machine. The diamond blade 1 has a pointed tip as shown in FIG. 1, and the stylus angle of the cell can be adjusted to a desired value by appropriately selecting the angle of the tip of the diamond blade.

  There are five types of cells engraved by an electronic engraving machine: compressed (0), normal (1), elon gate (2), coarse (3), and fine (4) (see FIG. 2). Compressed (0), Elon gate (2), coarse (3), and fine (4) types are mainly used.

The cell depth and volume are determined by the cell shape (0-4), the number of gravure lines, the stylus angle, the axial diameter and the circumferential diameter. Further, even in a cell having the same number of gravure lines and the same stylus angle, the cell depth, the cell volume, the axial diameter, and the circumferential diameter differ depending on the shape. For example, Table 1 shows an example when the number of gravure lines is 175 lines / inch and a stylus angle 120 °, and Table 2 shows an example when the number of gravure lines is 175 lines / inch and a stylus angle 130 °.

In the present invention, the volume of the gravure plate cell is not particularly limited, but is preferably 10 to 30 cc / m ² , and preferably 10 to 27 cc / m ² . If the cell volume is less than 10 cc / m ² , a sufficient application amount of the adhesive cannot be ensured, and the adhesion performance may be deteriorated or a rubbing pattern may be generated on the coated surface. On the other hand, when the cell volume is more than 30 cc / m ² , the curing time may be delayed, the workability may be inferior, and a tunneling phenomenon may occur in the laminated body after lamination. The depth of the gravure plate cell is not particularly limited, but is preferably 20 to 100 μm, and more preferably 25 to 85 μm. When the cell depth is less than 25 μm, a rubbing pattern tends to occur on the coated surface, and when it exceeds 100 μm, the curing time tends to be delayed.
The adhesive used in the dry laminating method of the present invention is not particularly limited as long as the solid content diluted with a solvent is 35% by mass or more, and an organic solvent type adhesive or an aqueous adhesive can be used. If the solid content is less than 35% by mass, the coating amount cannot be ensured, resulting in poor adhesion performance. The solid content is preferably 35 to 55% by mass, and more preferably 35 to 50% by mass.

  Examples of organic solvent adhesives include polyester resins, polyether resins, polyester ether resins, polyurethane resins, polyester urethane resins, polyether urethane resins, polyester ether resins, polyester ether urethane resins, and the like. And those obtained by dissolving a resin having an adhesive function in an organic solvent. These adhesives may be used alone as a resin, but are generally used as a two-component curable adhesive in combination with a curing agent containing a polyisocyanate compound.

  Examples of the polyester-based resin include terephthalic acid, isophthalic acid, adipic acid, azelaic acid, dibasic acid such as sebacic acid, or dialkyl esters thereof or mixtures thereof, for example, ethylene glycol, propylene glycol, diethylene glycol, butylene glycol, Glycols such as neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 3,3'-dimethylol heptane, polyoxyethylene glycol, polyoxypropylene glycol, polytetramethylene ether glycol Alternatively, it is obtained by ring-opening polymerization of a polyester resin obtained by reacting with a mixture thereof or lactones such as polycaprolactone, polyvalerolactone, poly (β-methyl-γ-valerolactone). Polyester resin that can be used.

  As the polyether-based resin, for example, an oxirane compound such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran is polymerized using, for example, water, ethylene glycol, propylene glycol, trimethylolpropane, glycerin, or the like as a low-part polyol. And polyether-based resins obtained.

  As the polyether ester resin, for example, obtained by reacting the above polyether resin with a dibasic acid such as terephthalic acid, isophthalic acid, adipic acid, azelaic acid, sebacic acid or the like, or a mixture thereof. And polyether ester resins.

The polyurethane-based resin is a polyol having a urethane bond in one molecule, and is, for example, a polyether polyol, polyester polyol, polyether ester polyol (hereinafter referred to as organic polyol (1)) having a number average molecular weight of 200 to 20,000. ) And an organic polyisocyanate are reacted at an NCO / OH of less than 1, preferably 0.9 or less. As said organic polyol, what has a carboxyl group in the molecule | numerator (inside molecule | numerator and molecular terminal) (henceforth organic polyol (2)) can be used. The organic polyol (2) is desirably obtained by reacting the organic polyol (1) with a polybasic acid or an anhydride thereof. As the organic polyol (1) used in this case, those having two or more hydroxyl groups at the molecular ends and having a number average molecular weight of 1,000 to 100,000, preferably 3,000 to 15,000 are preferably used. Is done. If it is 1,000 or less, the cohesive force is insufficient, and if it is 100,000 or more, it is difficult to react a polybasic acid or its anhydride at the terminal for synthesis, and there is a possibility of significant thickening or gelation. Examples of the polybasic acid or anhydride thereof include aromatic polybasic acids such as phthalic acid, trimellitic acid, and pyromellitic acid, and anhydrides thereof. Phthalic anhydride that is an anhydride thereof, Trimellitic anhydride, pyromellitic anhydride and the like are particularly suitable. In addition, ethylene glycol bisanhydro trimellitate, glycerol tris anhydro trimellitate, ethylene glycol bis anhydro pyromellitate, glycerol tris anhydro pyromellitate, rosin component abietic acid derived from these anhydrides Alternatively, derivatives of maleic anhydride added to C ₁₀ H ₁₆ diene compounds and mixtures thereof can be used. The synthesis of the organic polyol (2) is carried out by adding a polybasic acid or an anhydride thereof, preferably a polybasic acid anhydride under heating after the synthesis of the organic polyol (1). It is possible to obtain a product containing a carboxyl group from the polycarboxylic acid and the polyhydric alcohol in one step or inside the molecule. The reaction with these polybasic acid anhydrides has an accelerating effect for improving the adhesive performance of the adhesive composition, for example, hot water resistance, oil resistance, acid resistance and the like. The reaction between the organic polyol and the polybasic acid anhydride is controlled to a temperature of 200 ° C. or less, preferably in the range of 150 to 180 ° C. so that the esterification reaction by the ring opening reaction of the polybasic acid anhydride becomes the main reaction. There is a need to. The reaction ratio of both is made into the polybasic acid anhydride of the quantity which consumes 40% or more of the hydroxyl groups in the molecule | numerator of an organic polyol. Here, “%” is based on the number of hydroxyl groups in the molecule of the organic polyol. When the said numerical value is less than 40%, the improvement of the acid resistance of the composition obtained is not enough. In addition, even when an aliphatic polyvalent carboxylic acid anhydride is used as the polybasic acid anhydride, a carboxyl group can be similarly introduced into the molecule, but in this case, the acid resistance is not improved, and the aliphatic polyvalent acid anhydride is not observed. The use of carboxylic acid anhydride is not preferred. Furthermore, when using polyester polyol or polyether ester polyol for the organic polyol (1), if only aromatic polyvalent carboxylic acid is used as the starting carboxylic acid, the physical properties of the organic polyol (1) are controlled. There are many problems in doing this. In particular, trivalent or tetravalent polycarboxylic acids produce branched organic polyols (1), which are easily gelled and cannot be used in large quantities. In addition, since aromatic polyvalent carboxylic acids have sublimation properties, when the organic polyol (1) is synthesized, these sublimates adhere to the reaction kettle or dehydrator, resulting in difficulty in production. In this regard, the use of an organic polyol having a carboxyl group in the molecule (organic polyol (2)) can avoid the above problems. Examples of the organic polyisocyanate include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, 2, Aliphatic diisocyanates such as 4,4- or 2,2,4-trimethylhexamethylene diisocyanate, 2,6-diisocyanate methyl caproate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanate methyl- 3,5,5-trimethylcyclohexyl isocyanate, 4,4'-methylenebis (cyclohexyl isocyanate), methyl 2,4-cyclohexanediisocyanate , Cycloaliphatic diisocyanates such as methyl 2,6-cyclohexane diisocyanate, 1,4-bis (isocyanate methyl) cyclohexane, 1,3-bis (isocyanate methyl) cyclohexane, m-phenylene diisocyanate, p-phenylene diisocyanate, 4, 4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4- or 2,6-tolylene diisocyanate or mixtures thereof, 4,4'-toluidine diisocyanate, dianisidine diisocyanate, 4 Aromatic diisocyanates such as 4,4'-diphenyl ether diisocyanate, 1,3- or 1,4-xylylene diisocyanate or mixtures thereof, ω, ω'-diisocyanate-1,4 Aromatic aliphatic diisocyanates such as diethylbenzene, 1,3- or 1,4-bis (1-isocyanate-1-methylethyl) benzene or mixtures thereof, triphenylmethane-4,4 ′, 4 ″ -triisocyanate, 1, Organic triisocyanates such as 3,5-triisocyanatebenzene and 2,4,6-triisocyanatotoluene, organic tetraisocyanates such as 4,4'-diphenyldimethylmethane-2,2'-5,5'-tetraisocyanate, etc. Polyisocyanate monomer, dimer, trimer, biuret, allophanate derived from the polyisocyanate monomer, 2,4,6-oxadiazinetrione ring obtained from carbon dioxide and the polyisocyanate monomer Polyisocyanates having, for example, ethylene glycol , Propylene glycol, butylene glycol, hexylene glycol, neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 3,3'-dimethylolpropane, cyclohexanedimethanol, diethylene glycol, triethylene glycol Adducts with low molecular weight polyols having a molecular weight of less than 200 such as ethylene glycol, dipropylene glycol, glycerol, trimethylolpropane, pentaerythritol, sorbitol, or polyester polyols, polyether ester polyols, polyesteramides having a molecular weight of 200 to 20,000 Polyol, polycaprolactone polyol, polyvalerolactone polyol, acrylic polyol, polycarbonate polyol, polyhydroxyalkane, sunflower Examples include adducts such as coconut oil and polyurethane polyol.

  Examples of the polyisocyanate compound used as a curing agent for the organic solvent adhesive include the organic polyisocyanate.

  Examples of the aqueous adhesive include an aqueous polyurethane adhesive, an aqueous acrylic adhesive, an aqueous polyester adhesive, and an aqueous polyether adhesive.

  Aqueous polyurethane adhesives disperse or dissolve in water water a polyurethane compound having a carboxyl group obtained by reacting a polyol compound containing no carboxyl group in the molecule, a polyol compound containing a carboxyl group in the molecule and a polyisocyanate compound. There are self-emulsifying water-dispersible or water-soluble water-based urethane adhesives. Further, there is a water-dispersible polyurethane adhesive in which a polyurethane compound obtained by reacting a polyol compound not containing a carboxyl group in the molecule with a polyisocyanate compound is forcibly emulsified in water using surface activity. Polyol compounds that do not contain a carboxyl group in the molecule used in the aqueous urethane adhesive include, for example, polyester polyols, polyether polyols, polyether polyester polyols, polyurethane polyols, polyester amide polyols, acrylic polyols, polycarbonate polyols, and polyhydroxyalkanes. , Castor oil, or mixtures thereof. Examples of the carboxyl group-containing polyol include dimethylolpropionic acid and dimethylolbutanoic acid, and dimethylolbutanoic acid is particularly preferable. Examples of the polyisocyanate compound include tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, 1,5-naphthalene diisocyanate, xylylene diisocyanate, and the like. 4,4'-diphenylmethane diisocyanate is particularly preferred.

  The aqueous acrylic adhesive is an aqueous acrylic adhesive obtained by emulsion polymerization of an acrylic monomer containing no carboxyl group and an acrylic acid monomer containing a carboxyl group.

  The film used in the dry laminating method of the present invention is not particularly limited, and examples thereof include plastic films such as polyester, polyamide, polyethylene, and polypropylene, metal vapor deposited films such as aluminum, silicon oxide, and aluminum oxide, and metal foils such as aluminum foil. The combination includes the plastic films, a plastic film and a metal vapor-deposited film, a plastic film and a metal foil, and the like. The thickness of the film is also not particularly limited, and is usually 5 to 200 μm.

In the dry lamination method of the present invention, by using a high solid content adhesive,
The dry coating amount of the adhesive can be ensured in the range of 1 to 8 g / m ² , and a laminate having excellent adhesion performance can be obtained, and can be suitably used particularly for food applications.

  Hereinafter, the present invention will be described in detail by way of examples. However, the following examples do not limit the present invention.

Example 1
A biaxially oriented polypropylene film (OPP; manufactured by Toyobo Co., Ltd., Pyrene Film OT P-2161) with a thickness of 20 μm as a base material, and a gravure number of 175 lines / inch and a stylus angle created by an electronic engraving plate (Helio plate) 120 °, compressed, axial diameter of 180 μm, circumferential diameter of 170 μm, cell depth of 52 μm, using a dry laminator (Fuji Kikai Kogyo Co., Ltd .: FL2 type), high solid organic solvent Type adhesive (manufactured by Toyo Morton Co., Ltd., polyester adhesive, TM-550) is applied at a solid content of 45% by mass, and the solvent is volatilized by a dryer (temperature 60 ° C, 70 ° C, 80 ° C, 80 ° C). Then, an unstretched polypropylene film (CPP; manufactured by Tosero Co., Ltd., GHC # 25) having a thickness of 25 μm was applied at 50 ° C. with a nip roll. Lamination was performed to obtain a laminate.

After cutting the obtained laminated body into a size of 10 cm × 10 cm, the weight of the laminated body: A (g) was measured with a precision balance. Thereafter, the laminate was peeled off, and the adhesive adhering to both peeled surfaces was completely wiped off with ethyl acetate. The film after wiping off the adhesive was dried at 80 ° C. for 5 minutes, and the weight (B) of both films peeled off by a precision balance was measured. The dry coating amount was calculated by the following formula, and was 2.8 g / m ² .

Dry coating amount (g / m ² ) = (A−B) /0.01
Moreover, when the external appearance of the obtained laminated body was visually observed, it was a uniform and favorable surface.

(Example 2)
A helio-plate with a gravure number of 200 lines / inch, a stylus angle of 120 °, an elongate gate, an axial diameter of 125 μm, a circumferential diameter of 180 μm, and a cell depth of 36 μm, and an aqueous acrylic adhesive as an adhesive A laminate was obtained in the same manner as in Example 1 except that (ROBOND L-250, manufactured by Rohm and Haas) was used at a solid content of 45% by mass. The dry application amount of the adhesive was 2.2 g / m ² . When the external appearance of the obtained laminated body was visually observed, it was a uniform and favorable surface.

Example 3
A helio-plate with a gravure number of 250 lines / inch, a stylus angle of 130 °, an elongate gate, an axial diameter of 98 μm, a circumferential diameter of 145 μm, and a cell depth of 22 μm is used, and an aqueous acrylic adhesive as an adhesive A laminate was obtained in the same manner as in Example 1 except that (ROBOND L-250, manufactured by Rohm and Haas) was used at a solid content of 45% by mass. The dry coating amount of the adhesive was 1.5 g / m ² . When the external appearance of the obtained laminated body was visually observed, it was a uniform and favorable surface.

(Example 4)
A helio plate with a gravure number of 150 lines / inch, a stylus angle of 130 °, a coarse, an axial diameter of 210 μm, a circumferential diameter of 300 μm, and a cell depth of 49 μm is used as a high solid organic solvent as an adhesive. A laminate was obtained in the same manner as in Example 1 except that a mold adhesive (manufactured by Toyo Morton Co., Ltd., polyester adhesive, TM-550) was used at a solid content of 45% by mass. The dry coating amount of the adhesive was 2.8 g / m ² . When the external appearance of the obtained laminated body was visually observed, it was a uniform and favorable surface.

(Comparative Example 1)
Helio plate with a gravure number of 150 lines / inch, stylus angle of 115 °, compressed, axial diameter of 230μm, circumferential diameter of 200μm, cell depth of 67μm, high solid organic as adhesive A laminate was obtained in the same manner as in Example 1 except that a solvent type adhesive (manufactured by Toyo Morton Co., Ltd., polyester adhesive, TM-550) was used at a solid content of 45% by mass. The dry coating amount of the adhesive was 4.8 g / m ² . When the appearance of the obtained laminate was visually observed, a streak-like pattern was produced.

(Comparative Example 2)
A Helio plate with 175 gravure lines / inch, stylus angle 150 °, compressed, axial diameter 180 μm, circumferential diameter 170 μm, cell depth 23 μm as a helio version, and high solid organic as an adhesive A laminate was obtained in the same manner as in Example 1 except that a solvent type adhesive (manufactured by Toyo Morton Co., Ltd., polyester adhesive, TM-550) was used at a solid content of 45% by mass. The dry coating amount of the adhesive was 1.2 g / m ² . When the appearance of the obtained laminate was visually observed, rubbing occurred.
(Comparative Example 3)
Helio version uses a helio plate with 100 gravure lines / inch, stylus angle 130 °, compressed, axial diameter 310 μm, circumferential diameter 305 μm, cell depth 72 μm, and high solid organic as adhesive A laminate was obtained in the same manner as in Example 1 except that a solvent type adhesive (manufactured by Toyo Morton Co., Ltd., polyester adhesive, TM-550) was used at a solid content of 45% by mass. The dry application amount of the adhesive was 5.2 g / m ² . When the appearance of the obtained laminate was visually observed, a streak-like pattern was produced.

(Comparative Example 4)
Helio version uses a helio plate with a gravure number of 350 lines / inch, a stylus angle of 130 °, a compressed diameter of 85 μm in the axial direction, a diameter of 80 μm in the circumferential direction, and a cell depth of 20 μm. A laminate was obtained in the same manner as in Example 1 except that a solvent type adhesive (manufactured by Toyo Morton Co., Ltd., polyester adhesive, TM-550) was used at a solid content of 45% by mass. The dry coating amount of the adhesive was 1.2 g / m ² . When the appearance of the obtained laminate was visually observed, rubbing occurred.
The above results are shown in Table 3.

  From Table 3, Examples 1-4 were the surfaces where the external appearance of the laminated body after a lamination was uniform and was favorable. On the other hand, in Comparative Examples 1 to 4 in which the number of gravure lines and the stylus angle deviate from the scope of the present invention, it was impossible to obtain a good surface due to streaky patterns and rubbing of the laminated body after lamination. .

It is a figure which shows a diamond blade (stylus). It is a figure which shows the shape of the cell engraved with the electronic engraving machine.

Claims (3)

  In a dry laminating method in which an adhesive having a solid content of 35% by mass or more diluted with a solvent is applied to a film by a gravure method, the solvent is volatilized, and another film is bonded to obtain a laminate, and the stylus angle is A dry laminating method, wherein the adhesive is applied using a gravure plate engraved with an electronic engraving machine having a gravure line of 120 to 270 lines / inch.   2. The dry laminating method according to claim 1, wherein the adhesive is an organic solvent type adhesive or an aqueous adhesive.   A laminate obtained by the dry lamination method according to claim 1.

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