JPH0262289A - Transfer film - Google Patents

Abstract

PURPOSE:To facilitate decoration of a three-dimensional molded article by providing an anchoring agent layer and a release layer on a plastic film base being excellent in thermoformability and by providing a pattern layer of ink of vinyl chloride, vinyl acetate or acrylic resin and an adhesive layer. CONSTITUTION:A base 1 is formed of polyvinyl chloride or the like having a thickness of 50 to 300 microns and excellent thermoformability, and an anchoring agent layer 2 of urethane resin maintains adhesion between a release layer 3 and the base 1. The release layer 3 is formed of a substance being inferior in the adhesion to a pattern layer, e.g. chlorinated polypropylene resin. Next, the pattern layer 4 is provided with ink containing vinyl chloride acryl resin by a silk screen printing method, and an adhesive layer 5 formed of urethane resin is provided. A transfer film thus prepared is softened by heating, made to adhere to a surface to be transferred of a three-dimensional molded article and cooled, and is exfoliated thereafter. Then the pattern layer is transferred entirely onto said surface and it is not left on the base.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer film whose base material is a plastic film that is easily deformed by heat and has good moldability.

<Prior Art> As transfer films, polyester films, polypropylene films, polyethylene films, paper and laminated films thereof, or paper-based films with a release agent provided on the release surface have been used as transfer films. These transfer films can reliably apply pictures if the shape of the surface to be transferred is flat, but if the shape of the surface to be transferred is complex or curved,
It was impossible to transfer it to a so-called three-dimensional molded product.

In addition, it is possible to paint the transferred surface of a three-dimensional molded product by laminating it if a polyvinyl chloride film with good thermoformability is used as the base material of the transfer film. In some cases, there is insufficient separation between the base material made of polyvinyl chloride film and the pattern layer made of ink using vinyl chloride-vinyl acetate copolymer resin or acrylic resin as a binder resin, which is commonly used as transfer ink, resulting in transfer painting. was unable to do so.

Therefore, in order to ensure the peeling of the base material and the painted layer, a configuration in which a release layer is provided between the base material and the painted layer is considered, but the base material with good thermoformability is the polyester film mentioned above. However, the resins that can be used as the release layer are limited.

Furthermore, the release layer made of these resins has poor adhesion to the above-mentioned transfer ink, and also has insufficient solvent resistance.
When painting was performed in a post-process, it also caused deterioration of the surface condition.

The problem that we are trying to solve> A transfer film for painting on three-dimensional molded products using a plastic film with good moldability as a base material. The purpose of the present invention is to provide an easy-to-use transfer film that can be used to decorate three-dimensional molded products.

<Means for solving the problem> The present invention takes advantage of the poor adhesion between different resins to apply a pattern layer made of an ink made of salt-vinyl acetate and acrylic resin, which is common as a transfer ink. polyamide resin,
A resin such as chlorinated polypropylene resin, chlorinated ethylene vinyl acetate resin, nitrified cotton thread resin, cellulose acetate resin, or urethane elastomer is used as a release layer to facilitate peeling between the pattern layer and the release layer between the eyebrows, This is a transfer film that uses urethane resin as an anchor layer to maintain adhesion between the base material and the release layer.

The specific structure of the transfer film is as shown in Figure 1.
A base material 1, an anchor layer 2, a release layer 3, a pattern layer 4, or an adhesive layer 5 as shown in FIG. 2 are sequentially provided.

Here, the base material 1 may be appropriately selected from polyvinyl chloride resin, polystyrene resin, acrylonitrile resin, and ABS resin, which have a thickness of 50 to 300 μm and have good thermoformability.

The anchor agent layer 2 is for maintaining the adhesion of the release layer 3 to the base material 1, and is suitably made of urethane resin.

In addition, for the release layer 3, a resin that has poor adhesion to the resin of the ink forming the pattern layer 4, has heat resistance, and has good elongation is suitable. Specifically, resins such as polyamide resin, chlorinated polypropylene resin, etc. Resins, chlorinated ethylene vinyl acetate resins, nitrified cotton thread resins, cellulose acetate resins, polyvinyltyral resins, cellulose acetate propionate resins, polyurethane elastomers, and combinations of these can be used.

The anchor agent layer 2 and release layer 3 are preferably provided by a gravure printing method or a roll coater method, and the coating amount is suitably in the range of 5 to 20 g/% (net).

The pattern layer 4 may be formed by any of the gravure printing method, offset printing method, flexographic printing method, and silk printing method, but the ink used should be one with excellent printability, heat resistance, flexibility, and solvent resistance. Specifically, an ink made of a vinyl chloride resin, a vinyl acetate resin, a polyacrylic resin, or a combination of these resins is used.

Adhesive Ji5 varies depending on the material of the formed product which is the transfer target, but may be urethane resin, PVC/PVC resin,
Any one of acrylic resin, ethylene vinyl acetate resin, and polyester resin may be appropriately selected depending on the material of the formed product.

This adhesive layer 5 can be provided by a gravure printing method, a silk printing method, or a roll coating method, and the coating amount is suitably in the range of 2 to 20 g/rrf (dry).

Here, if the adhesive is applied to the surface of the molded article by a spraying method or a dipping method, it is not necessary to provide an adhesive layer on the transfer film.

Next, a method of painting using the transfer film of the present invention will be explained.

For example, the apparatus shown in FIG. 3 has a heater 50 at the top, a pedestal 60 for placing the molded product B on the stock, and an upper chamber divided into two in the center so that the transfer film A can be sandwiched therein. . It consists of an upper chamber 20 and a lower chamber 21. The upper chamber 20 and the lower chamber 21 are provided with opening/closing pulps 22^ and 2, respectively.
Pipes 25A, 25 are provided with pipes 238 and 23B, and have valves 24A, 24B.
It is continuous with the vacuum pipe 30 through B.

Further, a pipe 25A from the upper chamber 20 is connected to a heated air tank 40 through a pipe 27 having a valve 26A.

To apply a painting to a three-dimensional mold using the apparatus shown in Fig. 5, first fix the transfer film A between the upper chamber 20 and the lower chamber 21 so that the adhesive side faces the molded product B. ,
The transfer film A is heated by the heater 50 to soften it and activate the adhesive.

During the heating, the valves 24A and 24B are opened to suck the air in the space surrounded by the upper chamber 20 and lower chamber 21 to maintain a reduced pressure state.

Then, when the transfer film A is softened, the pulp 248 is closed, the valve 26A is opened, and the heated air tank 40 is opened.
Heated air is instantly sent into the upper chamber 20 from the upper chamber 20.

At this time, the temperature and pressure of the heated air are determined by the type of transfer film,
Settings should be made taking into account the type and properties of the molded product, as well as the cooling caused by adiabatic expansion that occurs when air is sent into a chamber under reduced pressure.

After sending the heated air as described above and bringing the transfer film into close contact with the surface of the molded product, close the valve 26A and close the valve 22.
A, 22B and 24A are opened, and the upper chamber 20,
Outside air is introduced into the lower chamber 21 to lower the temperature of the transfer film A, and after fixing it to the surface of the molded product B, the base material is peeled off.
Only the pattern layer is transferred onto the surface of the molded product.

Effect> When transferring, the release layer is transferred to the molded product along with the pattern layer as in the conventional method, and the release layer is removed together with the base material during transfer, and only the pattern layer is transferred.

<Example> An anchoring agent layer made of a urethane resin and a release layer made of a chlorinated polypropylene resin were each coated at 8 g/rTf on a base material made of a heat-resistant vinyl chloride film with a thickness of 180 μ by gravure printing. (wet) l cloth and formed.

Next, a pattern layer was formed using an ink containing vinyl hydrochloride/acrylic resin, and an adhesive layer consisting of a urethane resin was provided using a silk screen printing method to produce a transfer film.

After placing this transfer film as shown in Figure 3, it was brought into close contact with the transfer surface of the three-dimensional molded product, and after cooling, the base material was peeled off, and the entire pattern layer was transferred to the transfer surface and the base material There was no remaining.

<Effects> Since the transfer film of the present invention has the above-mentioned structure, it is possible to transfer only the pattern layer well even though it has a simple structure.

Furthermore, because of its simple structure, it can be manufactured at a lower cost than conventional transfer films, making it easier to use.

Furthermore, since only the pattern layer is transferred without using a release layer, there is no problem of peeling between the eyebrows or suitability for post-painting, which are the negative effects of conventional release layers, and the omission of printing improves workability and yield. .

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing embodiments of the present invention,
FIG. 3 is an explanatory diagram showing an example of an apparatus for performing transfer using the transfer film of the present invention. 1...Base material 2...Anchor agent layer 3...Release layer 5...Adhesive layer 4...Picture layer Patent application Hitotoppan Printing Co., Ltd. Representative Kazuo Suzuki Figure 2 figure

Claims (1)

[Claims] (1) A thermoformable plastic film with a thickness of 50 to 300 μm is used as a base material, an anchoring agent layer and a mold release layer are provided on the base material, and a vinyl chloride resin, acetic acid, etc. are further provided on the mold release layer. A transfer film for painting three-dimensional molded products, which is provided with a pattern layer formed with an ink containing at least one of a vinyl resin and an acrylic resin, and an adhesive layer.