JPH0729518B2 - Transfer film - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transfer film for painting a three-dimensional molded article, and more specifically, it is based on a polyvinyl chloride film which is easily deformed by heat. The present invention relates to a transfer film used as a material.

[Conventional technology] Conventional transfer films include polyester film, polypropylene film, polyethylene film,
A paper and a laminated film of these or a paper having a base material and a release agent provided on a release surface is used. These transfer films can be reliably painted if the transferred surface has a flat shape, but it is impossible to transfer to a so-called three-dimensional molded product with a complicated transferred surface of the transferred body. there were.

In addition, it is possible to paint on the transfer surface of a three-dimensional molded product by laminating it by using a polyvinyl chloride film with good heat workability as the base material of the transfer film. Was not sufficiently peeled from the base material made of a polyvinyl chloride film and the pattern layer, and transfer painting could not be performed.

When such a polyvinyl chloride film is used as a base material, as shown in FIG. 4, a resin layer 3 is formed on the back surface of the base material 1 with an anchor agent layer 2 interposed therebetween, and the resin layer 3 has a releasability. The release layer 4 made of a good resin, the pattern layer 5, and the adhesive layer 6 had to be sequentially laminated and used.

As described above, when the polyvinyl chloride film is used as the base material, not only the resin layer 3 is provided in order to impart releasability, but also a resin that deforms similarly with the deformation of the base material 1 must be selected. did not become.

[Problems to be solved]

Good transfer painting (easy peeling and good adhesion to the surface to be transferred) with respect to a product whose surface to be painted by transfer has a three-dimensional shape, that is, a three-dimensional molded product. It is an object of the present invention to provide a transfer film that can be stably carried out and is inexpensive and easy to use.

[Means for solving problems]

An ink comprising a polyvinyl chloride film as a base material, and a binder which is a resin having good releasability from the base material and having thermal deformability corresponding to the deformation of the base material at the time of transfer I decided to provide the picture layer directly.

Moreover, as the binder of the ink used in the above-mentioned pattern layer, it is particularly preferable to use one of polyvinyl butyral, cellulose acetate propionate resin and chlorinated polypropylene resin.

Next, the present invention will be described with reference to the drawings.

First, as shown in FIG. 1, a pattern layer 13 formed by an ink using the above-mentioned resin as a binder and an adhesive layer 14 showing tackiness when heated are provided on the back surface of a substrate 11 made of a polyvinyl chloride film. It is a transfer film.

Here, the polyvinyl chloride film used for the substrate 11 is preferably 0.1 to 0.3 mm in thickness and contains 0 to 15 parts by weight of a plasticizer in order to have good thermoformability and releasability. ,
The ink forming the pattern layer 13 is polyvinyl butyral,
Any one of cellulose acetate propionate resin and chlorinated polypropylene resin can be used as a binder.

The adhesive layer 14 may be made of an acrylic resin, an ethylene-vinyl acetate-based resin, a vinyl chloride-vinyl acetate resin, or the like, which exhibits adhesiveness when heated, depending on the material of the molded product that is the transferred material.

The pattern layer 13 and the adhesive layer 14 may be formed by any one of a gravure printing method, a silk printing method, an offset printing method and a flexographic printing method.

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

For example, the apparatus shown in FIG. 2 has a heater 50 in the upper part, a pedestal 60 on which the molded product B is placed in the lower part, and an upper chamber 20 divided into two so as to sandwich the transfer film A in the center.
And the lower chamber 21. And the upper chamber 20
Opening valves 22A, 2A and 2
Provided with pipes 23A, 23B having 2B and valve 24
It is connected to the vacuum pump 30 through pipes 25A and 25B having A and 24B.

In addition, pipe 25A from upper chamber 20 to valve 26A
It is connected to a heated air tank 40 through a pipe 27 having a. In order to paint a three-dimensional molded product using the apparatus shown in FIG. 5, first, the transfer film A is fixed between the upper chamber 20 and the lower chamber 21 so that the adhesive surface is on the molded product B side, 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, and the air in the space surrounded by the upper chamber 20 and the lower chamber 21 is sucked to maintain a depressurized state.

Then, when the transfer film A softens, the valve 24A is closed and the valve 26A is opened, and the heated air from the heated air tank 40 is instantaneously sent into the upper chamber 20.

At this time, the temperature and pressure of the heated air depend on the type of transfer film,
Set it in consideration of the type and properties of the molded product, and the cooling due to adiabatic expansion that occurs when air is sent into the chamber under reduced pressure.

When heated air is sent as described above and the transfer film is brought into close contact with the surface of the molded product, the valve 26A is closed and the valves 22A and 22A are closed.
B and 24A are opened, outside air is introduced into the upper chamber 20 and the lower chamber 21, the temperature of the transfer film A is lowered, and after fixing to the surface of the molded product B, the base material is peeled off, and only the pattern layer of the molded product is removed. The transfer painting is done on the surface.

In addition to the device shown in FIG. 2, as shown in FIG. 3, there is no preformed product, and the film A is placed on the molding die 60.
Alternatively, the molten resin may be injected into the mold 60, and painting may be performed simultaneously with molding.

As described above, the three-dimensional molded product of the present invention includes not only the molded product in advance but also the molded product simultaneously with the transfer.

[Action]

According to the present invention, based on a polyvinyl chloride film,
A transfer film in which a pattern layer with good peeling is directly provided on the substrate, and an adhesive layer is provided thereon, and the binder of the ink used for the pattern layer is polyvinyl butyral or cellulose acetate propionate. The resin or chlorinated polypropylene resin is used.

By the way, transferability is determined by the balance between the "adhesive force between the transfer layer and the transfer surface" and the "force required to separate the transfer layer from the substrate". If either of these is too strong or too weak, good transfer cannot be achieved. Base material is PE
Designing transfer foil is relatively easy because it is easy to secure releasability that can be easily peeled in the case of a material that is difficult to adhere to originally (such as T) (the force to peel the layer to be transferred is weak). However, since PET has a high heat distortion temperature on the other hand, this is poor in the property that it can be easily heat deformed according to the three-dimensional shape of the transferred surface, which is required when transferring to a three-dimensional molded product, and It is not suitable for applications such as transfer painting on three-dimensional molded products like this application.

By the way, the type of base film material that can be used for transfer involving three-dimensional forming represented by the vacuum forming method is considerably restricted for that purpose, and among them, PVC shows the best suitability.

However, since PVC has a high affinity for a wide range of resins, it is difficult to ensure good peelability. For this reason, the types of ink binders that have good releasability from vinyl chloride and that can follow the elongation required for transfer to three-dimensional molded products will naturally be limited.

In the present invention, as a result of the inventors' earnest research and examination, a pattern layer is directly provided on the base material, and the peelability from the base material, polyvinyl chloride, is good and a three-dimensional molded product is obtained. We have found that the solution is to use a specific material for the ink binder as the most suitable picture layer that has good elasticity when transferring and can follow three-dimensional shapes well depending on the transferred surface. , It is said polyvinyl butyral, cellulose acetate propionate resin, or chlorinated polypropylene resin.

The reason why the peelability from polyvinyl chloride is improved (easy peeling) in the case of these three materials is because of the affinity of the interface between the polyvinyl chloride as the base material and the pattern layer. It seems to be related to.

Then, by further providing the above-mentioned adhesive layer on the above-mentioned pattern layer, the pattern layer can also obtain good adhesion to the transferred surface of the three-dimensional molded article.

Example A gravure printing method for a wood grain pattern layer and a colored solid layer with an ink using a cellulose acetate propionate resin as a binder on a substrate made of a polyvinyl chloride film containing 5 parts by weight of a 0.20 mm thick plasticizer. Provided by.

Next, an acrylic resin adhesive was applied by a gravure coating method at about 3 g / m ² (solid content) to obtain a transfer film.

After placing the transfer film as shown in FIG.
When the substrate was peeled off after closely adhering to the transferred surface of the three-dimensional molded product under conditions of ℃ and 1.5 kg / cm ² , all the pattern layers were transferred to the transferred surface and did not remain on the substrate.

[Example 2] A transfer film having the same structure as in Example 1 except that polyvinyl butyral was used as the resin forming the pattern layer of Example 1,
When the same test was performed, the same results as in Example 1 were obtained.

〔effect〕

According to the present invention, since the transfer film has the above-mentioned constitution, the transfer painting can be performed favorably and stably with respect to a three-dimensional molded product whose surface to be painted by transfer has a three-dimensional structure. It is now possible to provide a transfer film that can be carried out for a long time and is inexpensive and easy to use.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a transfer film of the present invention, FIGS. 2 and 3 are explanatory views showing a state of painting a three-dimensional molded article by the transfer film of the present invention, FIG. The figure is a cross-sectional view showing the structure of a conventional transfer film using a polyvinyl chloride film as a base material. 11 …… Base material, 13 …… Design layer 14 …… Adhesive layer

Claims (1)

[Claims] 1. A polyvinyl chloride film as a base material, a picture layer is provided directly on the base material, and an adhesive layer is provided thereon, and the picture layer comprises polyvinyl butyral, cellulose acetate. A transfer film made of an ink containing one of a propionate resin and a chlorinated polypropylene resin as a binder and used for painting a three-dimensional molded product.