JPH071892A - Transfer sheet and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture a urethane synthetic leather in one process by using a transfer sheet as a laminate formed by laminating successively a paper layer, a polyolefin resin layer, a bonding agent layer, a polyethylene terephthalate film layer and a transfer printed layer. CONSTITUTION:A transfer sheet used for manufacturing a synthetic leather is composed of a laminate formed by laminating successively a paper layer 1, a polyolefin resin layer 2, a bonding agent layer 3, a polyethylene terephthalate film layer 4 and a transfer printed layer 5, and recesses and projections (embosses) 8 are formed on the laminate. In the case of manufacturing synthetic leather, urethane resin 9 is applied on the surface of the transfer printed layer 5, and a synthetic leather base layer 10 is laminated on said applying face, and remaining papers of the transfer sheet (transfer shaping paper 6 and the like) are released after curing the urethane resin 9, by which the surface layer 7 with the emboss 8 and a pattern formed on its surface is laminated on the base layer 10. Then, a surface protection layer is formed on the transferred transfer printed layer 5 to complete the manufacture of synthetic leather.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet used for producing a synthetic leather having a synthetic resin layer such as a urethane resin having a pattern and a grain on its surface.

[0002]

2. Description of the Related Art Conventionally, even if an embossed release paper having a textured embossing is used to form a multicolored printing pattern layer on the surface by printing, the ink is evenly distributed on the embossed surface by a normal printing method such as gravure printing. Since it was impossible to reproduce a multicolored pattern without adhering to the surface, it was impossible to produce a transfer sheet having a pattern on the embossed surface by printing. Therefore, in order to manufacture a urethane-based synthetic leather having a printed pattern and a wrinkle, a method of forming a wrinkle on the surface in a separate step after providing a pattern by direct printing or transfer printing in a smooth state It is manufactured in two steps.

[Problems to be Solved by the Invention]

An object of the present invention is to produce a transfer sheet for producing synthetic leather which can produce urethane synthetic leather having a printed pattern and embossed embossing, which has been produced by two steps, in one step, and a method for producing the same. Is to provide.

[0004]

[Means for Solving the Problems] A laminate comprising a paper layer, a polyolefin resin layer, an adhesive layer, a polyethylene terephthalate film layer, and a transfer printing layer, which are laminated in this order, and the laminate has irregularities. Is a transfer sheet.

Polyethylene terephthalate of a pattern transfer film in which a transfer printing layer is provided on a polyethylene terephthalate film layer on the surface of the polyolefin resin layer of the transfer patterning paper which is a laminate of a paper layer and a polyolefin resin layer and is embossed. A transfer sheet characterized in that the film layer surface is laminated via an adhesive layer, and heat and pressure are applied from the side of the pattern transfer film to bring the pattern transfer film into close contact with the embossed surface of the transfer printing paper. Is a manufacturing method.

[0006]

[Function] A polyethylene terephthalate film, which is formed by printing a transfer printing layer on the polyethylene terephthalate film, has a polyethylene terephthalate film surface of a pattern transfer film, a laminate of a paper layer and a polyolefin resin layer, and an embossed transfer polyolefin paper. The resin layer surface is overlaid via an adhesive layer, and heat and pressure are applied from the transfer printing layer surface of the pattern transfer film, so that the pattern transfer film is adhered and laminated along the embossed surface of the transfer printing paper. By using the transfer sheet having the constitution, the embossing and the pattern can be simultaneously transferred onto the surface of the base material, so that the synthetic leather can be manufactured in one step.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a laminated structure of a transfer sheet of the present invention, and FIG.
Is a cross-sectional view showing a laminated structure in which a urethane resin is applied to the pattern printing layer surface of the transfer sheet of the present invention and a base material layer is laminated,
FIG. 3 shows an embossed sheet produced by the transfer sheet of the present invention.
FIG. 4 is a cross-sectional view showing a laminated structure of a synthetic leather with a pattern, FIG. 4 is a schematic view of an apparatus for producing the transfer sheet of the present invention, and FIG. , (A) a pattern transfer film provided with an adhesive layer, (b) a transfer patterning paper having an emboss, and (c) a pattern transfer film provided with an adhesive layer and a transfer patterning paper. (D) is a cross-sectional view showing a state in which the adhesive layer surface of the pattern transfer film and the polyolefin resin layer surface having embossing of the transfer patterning paper are completely adhered to each other. Is a polyolefin resin layer, 3
Is an adhesive layer, 4 is a polyethylene terephthalate film layer, 5 is a transfer printing layer, 6 is transfer pattern paper, 7 is a pattern transfer film, 8 is embossing, 9 is a urethane resin layer, 10 is a base material layer, and 20 is a pattern. Transfer film paper feed unit, 21 is an adhesive application unit, 22 is a gravure printing plate, 23 is an impression cylinder, 24 is a drying device, and 25
Is a rubber roll, 26 is a metal roll, 27 is a hot air blowing section, 28
Is a transfer paper feed unit, and 29 is a transfer sheet winding unit.

As shown in FIG. 1, the transfer sheet of the present invention is made of a laminate of a paper layer 1 and a polyolefin resin layer 2 and has a grain-shaped embossing 8 formed thereon. The resin layer 2 surface and the polyethylene terephthalate film layer 4 surface of the pattern transfer film 7 in which the transfer printing layer 5 is provided on the polyethylene terephthalate film layer 4 are transferred by an adhesive layer 3 made of a pressure sensitive adhesive or a urethane adhesive. The polyethylene terephthalate film layer 4 of the pattern transfer film 7 is laminated along the embossed surface 8 of the pattern paper 6 in a closely contacted state.

The transfer pattern paper 6 has a structure in which a paper layer 1 and a polyolefin resin layer 2 are laminated and a wrinkle-shaped emboss 8 is formed on the surface of the polyolefin resin layer 2. Paper layer 1 is 1
Kraft paper of 100 to 200 g / m ² or high-quality paper is used, and as the polyolefin resin layer 2, polypropylene, polyethylene, ethylene-propylene copolymer, blend resin of polypropylene and polyethylene, or the like can be used. The transfer-molding paper 6 is manufactured by laminating the polyolefin resin layer 2 on the paper layer 1 by extrusion lamination,
A method of applying embossing with a embossing machine, or a cooling roll formed by etching to form irregularities corresponding to the embossing 8 on the surface when extrusion laminating the polyolefin resin layer 2 on the paper layer 1 By doing so, it is possible to form the embossed embosses 8 on the surface of the polyolefin resin layer 2. In the former method, the embossed embosses 8 are applied to all layers of the transfer printing paper 6, and in the latter method, the polyolefin resin layer 2 of the transfer printing paper 6 is formed.
Only the wrinkle-shaped embossing 8 is applied.

The pattern transfer film 7 has a structure in which a transfer printing layer 5 is provided by printing on one surface of the polyethylene terephthalate film layer 4. The polyethylene terephthalate film layer 4 uses a film having a thickness of 4 to 12 microns. It is preferable that the transfer printing layer 5 be as thin as possible within a printable range. This is because the pattern transfer film 7 is superposed on the embossed surface of the transfer pattern paper 6 and the polyethylene terephthalate film layer 4 is completely along the embossed 8 surface by applying heat pressure by blowing hot air to facilitate adhesion. is there. The transfer printing layer 5 may be formed of only one pattern layer, or two layers of a release layer and a pattern layer, or three layers of a release layer, a pattern layer and an adhesive layer.

The transfer printing layer 5 may be formed of only the pattern layer as described above, but in the case where the pattern layer may not be completely transferred and may be partially left on the polyethylene terephthalate film layer 4, the release layer may be formed. Is preferably used to form a release layer and a pattern layer. If there is a problem with the adhesiveness between the urethane resin laminated on the base layer 10 of the synthetic leather and the transfer printing layer 5, it is better to provide an adhesive layer, but the pattern layer is composed of a pattern ink part and a solid ink part. If it consists of, it is not necessary to provide an adhesive layer. The pattern layer is formed by printing with ink made of acrylic resin, urethane resin or the like. Cellulose resin, acrylic resin is used as the release layer,
As the adhesive layer, the same acrylic resin or urethane resin as used for the pattern layer can be used.

FIG. 2 shows that when a synthetic leather is manufactured using the transfer sheet of the present invention, urethane resin is applied to the transfer printing layer 5 side of the transfer sheet, and the synthetic leather base layer is applied to the urethane resin coated side. 1 shows a laminated structure in which 10 are laminated. When the residual paper of the transfer sheet is peeled off after the urethane resin is cured, the emboss 8 and the pattern are formed on the base layer 10 of the synthetic leather as shown in FIG. Surface layers are stacked.
A surface protective layer is formed on the surface of the transferred transfer printing layer 5 to complete the synthetic leather.

FIG. 4 is a schematic view of an apparatus used for manufacturing the transfer sheet of the present invention. The polyethylene terephthalate film 4 of the pattern transfer film 7 is drawn out from the pattern transfer film paper feeding unit 20 by providing a transfer printing layer 5 including a release layer, a pattern layer and an adhesive layer on one side of the polyethylene terephthalate film layer 4 by printing. The adhesive layer 3 is provided on the surface of the layer 4 at the adhesive application section 21. The adhesive layer 3 is applied by the gravure printing method through the gravure printing plate 22 and the impression cylinder 23, and after the printing, the solvent of the adhesive layer 3 is removed through the drying device 24. After that, the transfer pattern paper feed unit 28
Polyolefin resin layer 2 of transfer pattern paper 6 fed from
The surface and the surface of the adhesive layer 3 of the pattern transfer film 7 provided with the adhesive layer 3 are overlapped and pressure-laminated between a rubber roll 25 made of soft rubber and a metal roll 26, and hot air is blown at high temperature and high pressure. By applying heat pressure to the transfer printing layer 5 side of the pattern transfer film 7 in the hot air blowing section 27, the polyolefin resin layer 2 side of the transfer patterning paper 6 and the adhesive layer 3 side of the pattern transfer film 7 are attached. Completely adhere it and wind it up on the transfer sheet winding section 30.

FIG. 5 shows a laminated structure during the manufacturing process of the transfer sheet before and after passing between the rubber roll 25 and the metal roll 26. FIG. The polyethylene terephthalate film layer 4 has a layered structure of a pattern transfer film 7 provided with an adhesive layer 3 on the surface thereof, and (b) has a wrinkle-shaped emboss 8 composed of a paper layer 1 and a polyolefin resin layer 2. The laminated structure of the transfer printing paper 6 is shown. 4C shows a state in which the adhesive layer 3 side of the pattern transfer film 7 and the polyolefin resin layer 2 side of the transfer patterning paper 6 are overlapped at the position shown by B in FIG. 4 and pressure-bonded between the rubber roll 25 and the metal roll 26. Is shown. By passing this laminated body through the hot air blowing unit 27, at the position indicated by C in FIG.
As shown in FIG. 2, the adhesive layer 3 side of the pattern transfer film 7 and the polyolefin resin layer 2 side of the transfer patterning paper 6 are completely adhered and laminated along the emboss 8, so that the transfer print layer of the pattern transfer film 7 is laminated. The emboss 8 is accurately reproduced on the surface of 5.

Example 1 On one side of a 4.5-micron-thick polyethylene terephthalate film, a 0.5-micron-thick release layer made of cellulose acetate by a gravure printing method, and an ink made of a urethane-based resin were used to give a grainy finish. A pattern and a solid ink layer were provided to produce a pattern transfer film. On the other hand, a polypropylene / polyethylene blend resin having a thickness of 70 μm is laminated on 170 g / m ² of high-quality paper by extrusion lamination, and the laminate is embossed through a leather embossing roll to have grain-like irregularities. A transfer printing paper was produced. Then, a pressure-sensitive adhesive layer made of an acrylic resin was applied to the polyethylene terephthalate film surface of the pattern transfer film by a gravure method to a thickness of 7 μm, the solvent was removed by a drying device, and then the pressure-sensitive adhesive layer surface was transferred to the above-mentioned transfer. By overlaying on the surface of polypropylene / polyethylene blend resin of the printing paper, stacking it between the rubber roll and the metal roll, and applying heat pressure from the printing surface of the pattern transfer film at the hot air blowing part, the transfer printing is performed. The embossed surface of the pattern paper and the pattern transfer film were completely adhered to each other via the adhesive layer to prepare a transfer sheet. A urethane-based resin is applied to the surface of the transfer printing layer of the transfer sheet to be laminated on the base material layer of the synthetic leather, and the remaining paper of the transfer sheet is peeled off to provide a synthetic leather with a grain pattern and grain-like embossing. I was able to.

[0016]

The polyethylene terephthalate film having a thickness of 4 to 12 μm and the polyethylene terephthalate film surface of the pattern transfer film formed by printing the transfer printing layer on the polyethylene terephthalate film, and the laminate of the paper layer and the polyolefin resin layer are embossed. By embedding the polyolefin resin layer surface of the transfer pattern forming sheet on which the is formed via the adhesive layer, and applying heat pressure from the transfer print layer surface of the pattern transfer film, the emboss of the transfer pattern forming sheet can be performed. It is a transfer sheet manufactured by a method of closely laminating a pattern transfer film along the formed surface. By using the transfer sheet, it is possible to simultaneously transfer the wrinkle-like unevenness and the pattern onto the surface of the synthetic leather substrate, and therefore, the urethane type having the printed pattern and the wrinkle-like unevenness, which has been conventionally produced by two steps. Synthetic leather can be manufactured in one step.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a laminated structure of a transfer sheet of the present invention.

FIG. 2 is a cross-sectional view showing a laminated structure in which a urethane resin is applied to the pattern printing layer surface of the transfer sheet of the present invention and base material sheets are laminated.

FIG. 3 is a cross-sectional view showing a laminated structure of embossed / patterned synthetic leather produced by the transfer sheet of the present invention.

FIG. 4 is a diagram showing an outline of an apparatus for producing a transfer sheet of the present invention.

FIG. 5 is a cross-sectional view showing a laminated state during a manufacturing process of the transfer sheet of the present invention, in which (a) is a pattern transfer film provided with an adhesive layer, and (b) is an embossed transfer sheet. The pattern paper, (c) is a state in which the pattern transfer film provided with an adhesive layer and the transfer patterning paper are laminated, and (d) is the adhesive layer surface of the pattern transfer film and the polyolefin resin layer surface having the embossing of the transfer patterning paper. FIG. 4 is a cross-sectional view showing a state in which the two are completely attached.

[Explanation of symbols]

 1 Paper Layer 2 Polyolefin Resin Layer 3 Adhesive Layer 4 Polyethylene Terephthalate Film Layer 5 Transfer Printing Layer 6 Transfer Printing Paper 7 Picture Transfer Film 8 Embossing 9 Urethane Resin Layer 10 Base Material Layer 20 Picture Transfer Film Paper Feeding Section 21 Adhesive Application Part 22 Gravure printing plate 23 Impression cylinder 24 Drying device 25 Rubber roll 26 Metal roll 27 Hot air blowing unit 28 Transfer pattern paper feeding unit 29 Transfer sheet winding unit

Claims (2)

[Claims] 1. A laminated body in which a paper layer, a polyolefin resin layer, an adhesive layer, a polyethylene terephthalate film layer, and a transfer printing layer are laminated in this order, and the irregularities are formed in the laminated body. Transfer sheet. 2. A pattern transfer film comprising a polyethylene terephthalate film layer and a transfer printing layer provided on the surface of the polyolefin resin layer of a transfer-type paper which is embossed and is composed of a laminate of a paper layer and a polyolefin resin layer. The polyethylene terephthalate film layer surface is laminated via an adhesive layer, and by applying heat and pressure from the pattern transfer film side, the pattern transfer film is brought into close contact along the embossed surface of the transfer printing paper. Transfer sheet manufacturing method.