JPS62292500A - Manufacture of transfer foil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for producing thermal transfer foil used for surface decoration of plastic molded products, and in particular, it relates to a method for producing thermal transfer foil used for surface decoration of plastic molded products. This invention relates to a method for manufacturing transfer foil for the purpose of forming a glossy change pattern consisting of a high film thickness.

(Prior art) Transfer foils conventionally used for surface decoration of plastic products are made by coating and forming a surface protective layer made of thermoplastic resin such as acrylic resin on the surface of a transfer foil base film. Generally, a pattern layer, a concealing layer, and an adhesive layer are sequentially formed, and therefore the surface hardness and durability of the final product are not sufficient. For this reason, especially when scratch resistance on the surface is required, it is necessary to take the complicated process of applying an ultraviolet curing transparent paint (so-called "decoat") to the surface of the transferred product.・Ivy.

Several methods have already been proposed for incorporating an ultraviolet curable coating film into a transfer foil from the beginning.

However, since the types of ink that provide sufficient adhesion to the UV-curable coating film (C) after curing are limited,
The method of applying an ultraviolet curable paint to the base film of the transfer foil, curing it by irradiating it with ultraviolet rays, and then sequentially forming a pattern layer, concealing layer, and adhesive layer produces a transfer foil that has sufficient adhesion for practical use. was not obtained.

(Problems that Hikarima is trying to solve) The present invention provides a glossy change pattern with excellent interlayer adhesion and strong scratch resistance and abrasion resistance on the surface by simply transferring it in the same way as ordinary transfer foil. The present invention presents a method for manufacturing a transfer foil that can obtain a transfer product having the following characteristics.

(Means for Solving the Problems) The method of the present invention will be explained in detail below with reference to the drawings.

First, as shown in Fig. 2, a printed base sheet (
A heat-sensitive adhesive (2) is applied to the surface of 1), and furthermore, a cover layer (3) and a pattern layer (4) are sequentially printed. Since the substrate sort is to be peeled off and removed in a later process, it is desirable to use a substrate as inexpensive as possible.
Polyethylene terephthalate) film, polypropylene film, polypropylene film laminated paper, etc. can be used. As the heat-sensitive adhesive, an appropriate one is selected depending on the material of the final transfer product, such as acrylic resin, polyamide resin, ethylene-vinyl acetate resin, wax, chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer resin. The hiding layer and pattern layer are selected in consideration of printability and adhesion to the ultraviolet curable resin used in the subsequent process. Acrylic resin, chlorinated rubber resin, vinyl chloride vinyl acetate copolymer resin, etc. are common. Next, as shown in Figure 3, an ultraviolet curable paint (6) was applied to the surface of the printed sheet (5) obtained above, and if necessary, heating was performed to remove the solvent in the paint. After that, PE with a thickness of about 25μ
After coating with the T film (7), the PET film surface is irradiated with ultraviolet rays to cure the coating material, and then, as shown in FIG. 1, the printing base sheet (1) is peeled off to obtain a transfer foil.

As the ultraviolet curable paint used here, it is preferable to use a hardness type of the known acrylic oligomer type ultraviolet curable paint. On the surface of the PET film used here that is in contact with the ultraviolet curable paint, a gloss-adjusting varnish layer (8), which has been adjusted to an arbitrary gloss, is formed in a pattern. At this time, P
If a varnish layer having a different gloss from the gloss adjusting varnish layer (8) is formed on the entire surface of the ET film, a pattern having an arbitrary difference in gloss can be formed.

The gloss adjustment varnish layer and the varnish layer with a different gloss are PE.
It is necessary to have adhesion to T-film and releasability to UV-curable coatings), and thermosetting polyester resins, polyamide resins, urethane resins, etc. are suitable.

(Example) A heat-sensitive adhesive mainly composed of acrylic resin is applied to the entire surface of the original fabric made of thin paper laminated with polypropylene resin, and then a concealing layer is formed with a concealing ink corresponding to the solid color of the wood grain pattern, and then A wood grain pattern was printed on top of this.

Vinyl chloride vinyl acetate copolymer resin ink was used for the hiding layer and the pattern layer. J Apply an acrylic resin-based ultraviolet curing paint (Mitsubishi Rayon (ceramic)) to the surface of the printing sheet obtained above, and apply a gloss-adjusting varnish layer on top of this using a polyamide resin-based gloss-adjusting varnish in advance. A PET film with a thickness of 25 μm formed in a checkered pattern was coated, and the coating was cured by irradiating ultraviolet rays from a high-pressure mercury lamp.

Next is polypropylene @! i The greasy laminate paper was peeled off to obtain the desired transfer foil.

The thus obtained transfer foil is transferred to the surface of a polystyrene resin molded product using a rubber roll heated to 210"C, and the PET film is peeled off and removed. The surface has excellent scratch resistance and interlayer adhesion. A wood grain transfer product was obtained which was of good quality and had a lattice-like gloss change pattern on the surface and had an extremely high design effect.

(Effect of brightness) The method of the present invention is different from the conventional method of manufacturing transfer foils.
Since the coating is applied onto the printed cypress 111 layer previously formed on the notebook and then cured by irradiation with ultraviolet rays, the adhesion between the ultraviolet curable coating and the pattern layer is good.

Furthermore, since the PET film that serves as the base sheet of the transfer foil is coated over the ultraviolet curable paint, there is an effect that curing is not inhibited by oxygen.

Furthermore, since the surface protective layer of the transfer foil uses an ultraviolet curable paint, it is possible to obtain a transfer product with excellent scratch resistance and excellent design effect with excellent abrasion resistance of the heat-changed pattern on the surface.

[Brief explanation of drawings]

The drawings provide a detailed explanation of the present invention. Figure 1 is a schematic diagram showing the process of peeling off the printed base sheet, Figure 2 is a sectional view showing the structure of the printed sheet, and Figure 3 is a diagram showing the process of peeling off the printed base sheet. FIG. (1)...Printed base sheet (2)...Thermosensitive adhesive (3)...Hidden layer (4)...Picture layer (5)...Printed sheet (6)... Ultraviolet curable paint (power...PET film (81...
Gloss adjustment varnish layer (9)...UV irradiation device

Claims (1)

[Claims] A method for manufacturing a transfer foil comprising the following steps. (1) A step of printing and forming a hiding layer and a pattern layer after applying a heat-sensitive adhesive to a printing base sheet having mold releasability. (2) A UV-curable paint is applied to the sheet surface obtained in (1), and then a transparent polyethylene terephthalate layer is coated with one or more types of gloss-adjusting varnish layers with different glosses in a pattern on the surface. A process in which a film is coated with the pattern layer facing downward, and the coating is cured by irradiating ultraviolet rays from above. (3) A step of peeling off and removing the printed base sheet having releasable properties.