JPS5890982A - Transfer printing method for synthetic resin molded article - Google Patents

Abstract

PURPOSE:To facilitate transfer printing without generating any change on the surface of a molded article even when an elastic body comes into direct contact with the molded article, by a method wherein a film provided with a transfer pattern is brought into close contact with the surface of a synthetic resin molded article, and is pressed by an elastic body being heated. CONSTITUTION:A heat-resistant silicone roll 6 is worked in an ordinary method, and a solution form silicone is spray-coated on the entire surface of the roll 6, and is hardened. The elastic heat-resistant roll 6 thus produced is heated, a transfer film 10 is so placed as to border on the boundary 11 between a cylindrical part 8 and a curved part 9 of the molded article, the roll 6 is so placed that an end part 12 thereof make contact with the boundary 12, and transfer printing is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transferring images such as patterns on synthetic resin products.

Normally, when transferring a transfer image onto a synthetic resin product, a roll or plate of an elastic material such as thermal silicone is pressed onto the molded product through a transfer foil with a confirmed transfer pattern, and the transfer foil A method is adopted in which the above transfer pattern is transferred to the molded product. Here, the heated elastic body of the silicon roll or plate functions to be smaller than the transfer foil, and it is necessary to devise measures so that the heated elastic body does not come into direct contact with the molded product. This is because when the heated elastic body is directly heated and pressurized on the surface of the molded product, the surface of the molded product melts and the unevenness of the hot roll is transferred, which changes the gloss and impairs the appearance. It is.

The present invention has been studied in order to eliminate such inconveniences during transfer, and specifically, the surface of the heated elastic body is mirror-finished or finished to be the same as the inner surface of the mold in which the synthetic resin molded product is molded. To provide a transfer method characterized in that the surface condition of a molded article does not change at all even when a heated elastic body directly touches the molded article.

That is, in the present invention, a synthetic resin film with a transferred pattern is closely attached to the surface of a synthetic resin molded product, and the film has a surface smoothness larger than the film area from the back side and comparable to that of the synthetic resin molded product. This is a method of transferring a transfer pattern to a synthetic resin molded product by pressing a heated elastic body to transfer a transferred pattern onto the surface of the molded product.

A more detailed explanation will be given below based on the drawings.

In general transfer processing, as shown in Figure 1, a transfer film (3) with a transfer pattern (4) printed on it is passed between a heat roll (1) and a synthetic resin molded product (2), and the heat roll fl
) is pressed onto the molded article (2) while heating, and the transfer pattern (4) is pressed and transferred onto the molded article using heat and pressure. In this case, the width of the transfer film is usually larger than that of the molded product, or the d] of the transfer film is larger than that of the heat roll, so that the heat roll does not come into direct contact with the molded product. It is common to make sure that there is no such thing. this! The reason for this is that, as mentioned above, when the hot roll directly touches the molded product, the surface of the molded product will be slightly melted by the hot roll, and will be embossed on the surface of the hot roll, for example, causing a mirror surface. This was because in some cases, only some of the molded products they had were embossed with hot rolls, becoming matte and losing their luster.

Therefore, in the present invention, the microscopic shape of the surface of the heat roll is the same as that of the molded product, and a heat-resistant roll and a transfer method are used that do not change the surface condition and surface gloss of the molded product even when the heat roll touches the molded product. I ended up inventing it.

In other words, as shown in Fig. 2, when the transfer pattern (4) is applied between the heat roll (1) and the molded product (2), and a transfer film (3) with a small area is interposed, the transfer pattern (4) is placed between the heat roll (1) and the molded product (2). of (A
) and (B), the hot roll (1) comes into direct contact with the molded product. In this case, in the conventional transfer process, the surface condition or gloss of the molded product in the parts (1) and (B) differs from other parts, making it very unsightly. However, in the transfer method according to the present invention,
Such a change in the gloss of the molded product does not occur, and the surface quality is uniform over the entire surface of the molded product. Figure 1 shows the molded product on a plane. This is a view of the state of transfer from above, and a transfer film (3r) is placed in a spot on a part of a large molded product (2f), and then a hot plate (5) larger than 3f is placed on top of the transfer film (3r). When pressurizing and performing transfer processing, there is usually a problem that the surface shape changes in the part where the hot plate (5) touches the molded product (2f), but the transfer method according to the present invention does not have this problem.

Here, to explain in detail about the hot roll or plate used in this transfer method, the hot roll or plate is usually processed with a silicone or fluorine-based elastic body, but usually the processed elastic body is further finished to precise dimensions and polished. Adopt a method to do so. A rubber elastic body processed by such a method has a uniform plane from a macroscopic perspective, but from a microscopic perspective, unevenness on the order of several micrometers cannot be avoided. Because of this unevenness, when a heated roll or plate is pressed against the surface of the molded product during the transfer process of the transfer pattern, the thin layer on the surface of the molded product will melt, and the heat roll or plate will partially or follow the shape of the plate surface. The surface condition of the molded product changes because the shape is processed and bossed, and light is diffusely reflected. Therefore, in the present invention, by using a heat-resistant roll or plate that has the same surface as the surface of the molded product that requires transfer painting, for example, when transferring to a molded product with a specular gloss, it is possible to process it by ordinary polishing. The heat-resistant roll or plate is further coated with a heat-resistant thin film layer by a method such as spray coating or dipping, and the surface is made smooth and transfer processing is performed. Here, examples of materials for forming the heat-resistant thin film layer include solution silicone rubber, fluorine rubber, and the like. By adding heat-resistant particles to these thin film layers, the surface smoothness can be changed. On the other hand,
When performing transfer processing on molded products with matte surfaces,
Molds for processing molded products, such as injection molds,
There are blow molds, etc., but a mother mold for rubber molding with the same surface shape as these molds is made, and when making a heat-resistant rubber roll or plate for transfer, the mother mold is strongly pressed against the heated rubber. By casting, the surface of the heat-resistant rubber roll or plate is made to have the same level of surface smoothness as the mother mold, so that the surface condition does not change even if the heated roll or plate hits the molded product during transfer. It is something.

The following will be explained based on examples.

<Example 1> When transferring to the cylindrical folding part (8) of the J: sea urchin bowl-shaped container (7+ (made of A, S resin) shown in Fig. 4), the design configuration 2. 0.5 from the upper limit of
It was desired to process the ox pattern on the % part, but with the conventional technology, the hot roll inevitably comes into contact with the upper arm curved surface (9) when transferring, resulting in a matte surface of the molded product. It had the drawback of being too lenient. Therefore, the heat-resistant silicone roll (6) shown in Fig. 5 was processed using the usual method, and then liquid silicone was further sprayed on the entire surface.1. , hardened. Here, the amount of silicone rubber applied was approximately 10 μm, and sufficient leveling was performed to make the surface mirror-like. The heat-resistant roll thus produced was heated to 230°C, and each part was placed in the position shown in FIG. 5, and transfer processing was performed. Here, H is the transfer film, (11) - the boundary between the cylindrical part and the bent arm part of the molded product. Specifically, transfer film (IO (11)
Place it so that it touches the point, and the A41 part 0 of the heat roll is (1
If you set it at the position corresponding to part 1) and perform the transfer process, the transferred pattern will be stable even at a position of 05% from the part (11) of the molded product, and the transfer process will not be affected. There was no change in surface gloss.

<Example 2> As shown in Fig. 6, outer layer nylon (polyamide resin),
A strip pattern (14) was transferred to the middle part of a laminated extruded tube having an adhesive resin intermediate layer and a polyethylene inner layer. At this time, the slitter width of the transfer film is the same as the strip pattern.
A heat roll (a roll produced in the same manner as in Example 1) having a wide chain surface was pressed onto the tube gold mine, and rotation transfer processing was performed to obtain a transfer product with a good surface condition. In addition, in this method, the transfer film can be used only in a small area, and the transfer film is not required only in the necessary parts of the image, so a large amount of film can be saved.

Since the present invention has the above-described configuration, even if a heated elastic body is directly heated and pressurized on the surface of a synthetic resin molded product, the surface state of the synthetic resin molded product does not change. Since there is no need to change the elastic body depending on the size of the transfer film, it is possible to easily perform spot transfer, which has been difficult in the past. Furthermore, as shown in Example 1, the present invention has practical advantages, such as the fact that the present invention can easily transfer all corners, such as the boundary between the cylindrical part and the bent arm part, which was difficult with the conventional method. The effects are huge.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are explanatory diagrams of a transfer method including the present invention, FIG. 3 is a spot transfer according to the present invention, and FIGS. 4 and 5 are explanatory diagrams of a transfer method including the present invention. FIG. 6 is an explanatory diagram of corner transfer, and FIG. 6 is an explanatory diagram of band-like transfer. (11 heat roll (2+(21 molded product) (3) (3
fαQ transfer film (4) transfer pattern (5) heat plate (6) heat-resistant silicone roll (7) bowl-shaped container
(8) Cylindrical folded part (9) Arm curved surface OD boundary θ
End part α■ Extruded tube Q-04) Band pattern patent applicant Toppan Printing Co., Ltd. 10- Figure 1 Figure 3 Figure 2 @↓ Figure 75 Figure @ 6

Claims (3)

[Claims] (1) A synthetic resin film with a transferred pattern is closely attached to the surface of a synthetic resin molded product, and the area of the film is larger than that of the back surface of the film, and the surface smoothness is comparable to that of the synthetic resin molded product. A method for transferring to a synthetic resin molded article, the method comprising transferring a transferred pattern onto the surface of the molded article by pressing a heated elastic body. (2) Finished with mechanical polishing, and then uniformly coated with heat-resistant substances such as solution silicone and fluorine compounds by spray coating, dipping, etc., and hardened to provide elasticity with excellent XF lubricity. The transfer method according to claim (1), which uses a transfer body. (3) Use a mold for molding an elastic body that has the same surface smoothness as the mold used to mold the synthetic resin molded product, and press the elastic body against the mother mold when processing the elastic body. , Claim No. m uses an elastic body made by injection.
Transfer method described in section.