JPS6362576A - Production of decorative steel sheet - Google Patents

Abstract

PURPOSE:To reduce the cost of the finished product by previously providing a pattern by screen printing and a pattern by gravure printing on a transfer film to form a multicolored pattern exhibiting the characteristics of both printing methods. CONSTITUTION:An optional pattern 4 is screen-printed on the surface of a substrate film 6 by using ink with a thermoplastic resin releasable from the film 6 as the binder. An optional pattern layer 3 is gravure-printed on the whole surface of the film 6 by using ink with a thermoplastic resin releasable from the film 6 and adhesive to the pattern 4 and the substrate coated film 2 to be formed in the succeeding stage as the binder to form a transfer film 7. Besides, the substrate coated film layer 2 is formed on the surface of the steel sheet coil 1 applied with necessary pretreatment, the transfer film 7 is hot- pressed on the layer 2, and the pattern layer is transferred. A transparent resin 5 is coated on the surface of the steel sheet with the transferred pattern layer, and cured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an IJ! straightening method for a decorative steel sheet whose surface is patterned.

(Conventional technology) Patterns on the surface than before? The coil-shaped steel plate that has been applied is widely used in various building materials and materials, but method 1
The only available methods were direct printing using the Egravure offset printing method. In the case of the gravure offset printing td+I method, is there a drawback that it is impossible to print faithfully to the original because in principle, ink fogging occurs? had. On the other hand, in recent years
Due to the increasing demand for design effects, in addition to gravure offset printing, the 11th method for screen seal notification? Added method (Special Publication No. 50-14566, Special Publication No. 50-16684)
has also been proposed, but if screen printing 2 is performed directly on a steel plate, is there a need to cut the steel plate? No use? Isn't it bad quality and therefore expensive because it doesn't get any benefit? I didn't get it.

(Problems that the invention attempts to solve) Does the present invention solve the above-mentioned drawbacks of the prior art? A pattern that is faithful to the manuscript using the gravure printing method, and a highly concealable pattern that is created using the screen printing method? Coiled decorative steel plate with great durability? How to control efficiently? This is what we provide.

(Problem? Means to solve the problem) The method of the present invention will be explained in detail below with reference to the drawings.

First, as shown in FIG. 2, the surface of the base film (6) has a releasability r for this base film. Using ink as a binder, print any pattern using the screen printing method.Screen ink rm
? Form. Suitable examples of the base film include polyethylene terephthalate film (hereinafter simply referred to as PET film), Horibu a-pyrene film, and a laminate sheet of paper and polypropylene. Also, is PET film pre-release coated? What did you do? It's okay to stay inside. Screen mark +
Is the l111 ink made of an appropriate material depending on the combination with the base coating film and the transparent resin layer, which will be described later? Examples of useful materials include acrylic resin, polyester resin, vinyl chloride resin, vinyl chloride/vinyl acetate copolymer resin, polyvinyl butyral tetraside, alkyd resin,
MPt0TΦ characteristics such as polyamide-fat? Ink is used as a binder.

Relatively fine screen mesh of about 250-400 mesh per 1 filj mark? be careful not to make the ink layer too thick. Does this mean uneven winding, deformation, etc. when the printing eroded film rolls? Necessary for city defense. Next, the screen mark W is completed on the base film? Gravure rotary stamp 111 [Gravure ink layer with any pattern on the entire surface'2 EO (611t). It also needs to have adhesion to the base coating layer and transparent resin layer, which will be described later.

As the binder for the gravure ink, those described in the description of the screen ink can be similarly used. Here, even if the gravure ink Ifji has a discontinuous pattern, the screen ink layer exposed in the part where there is no gravure ink layer or the base film 11! However, is it inconvenient in the transcription process described later? There is no problem if it does not occur, but if necessary, adhesive 1-¥ may be applied to the entire surface. Whose layers are you peeling off like? The reason why it is not provided is that when the release layer γ is provided, it is usually done by a method other than the screen printing method, such as gravure coating or a-le coating.
This is because it not only becomes rough, but also often reduces the machining performance of the decorative steel sheet as a final product.

Next, the transfer film thus obtained? Transfer the cypress pattern 1-¥ onto the surface of the steel plate using In other words, as shown in FIG. 6, a base coating film 1 (1+217) is provided on the surface of a steel plate 11). , a brimer coat may be applied.For the base coat layer, thermosetting acrylic resins, polyester resins, and modified resins thereof may be used.Transfer 1C process, heat curing of the base coat layer. It can be done by preheating the base coat + $14, but it is more efficient and efficient to use preheating. After continuously pressing the transfer film onto the steel plate using a heated rubber roll, if necessary, after cooling the steel plate, only the base film is peeled off.

Next, as shown in Figure 1, the thermosetting transparent resin lI! 15) ¥ set, overall? The desired decorative steel sheet can be produced by introducing it into a heating furnace and heating and hardening it. obtain. Is UV-curable resin the transparent fat-resistant layer? It can also be used. Is the former a decorative steel plate with excellent workability? Is the latter a product with high surface hardness and excellent scratch resistance? suitable for getting.

Next, the method of the present invention will be described in more detail based on Examples.

(Example 1) Melamine 1 fat, alkyd + TT fat on the surface of a 25 μ thick PET film. Apply a release coat as a component, heat it to 180°C to harden it, and form a base film. Created. Next, the surface of the film is coated with vinyl chloride-vinyl acetate copolymer - fat? Screen ink as a binder? use, 6
Characters, scales, marks, border patterns, etc. on the front panel of a kerosene stove made up of blocks? Mark ~ 6 sushi. Next, on top of that is the same vinyl chloride vinyl acetate copolymer resin? Gravure ink used as a binder? A wood grain pattern composed of 3 versions? Marked -1 on the entire surface.

The transfer film obtained in this way? , pre-degreasing, chemical treatment, brimer coat? Alms, base amount @? The pattern layer was transferred to the surface of the formed low-galvanized steel coil by continuous pressure bonding with an EE adhesive rubber roll.

The plate temperature at the time of transfer was 120°C, and the surface temperature of the pressure-bonded rubber meal was 100°C. Is the material of the base coating film linear polymer polyester wood grain? Using.

Next is a steel plate coil? After cooling, a thermosetting (arsenic oil-free polyester resin transparent paint) was applied to the surface, and the entire surface was further heated to cure.

The decorative steel sheet coil obtained in this way already has a pattern of screen marks 16 on top of the wood grain pattern.
Punching and pressing? Just do the finished product of the front panel of the oil stove? I got something done. In addition, since it can be processed directly from the coil using a single reconnaissance press method, production efficiency is extremely high compared to the conventional single-wafer method.◎ Also, this decorative steel sheet has excellent workability such as hammering, pressing, and bending. Ta.

(Example 2) Acrylic resin was applied to the surface of a 25μ thick PET film. Screen ink as a binder? Use monthly calendar borders? Printed. Next, gravure ink with acrylic m@y binder on the entire surface? A plain grained tank inside? Print and transfer film? Obtained.

Next, the surface of a 0.4 m thick galvanized steel sheet was degreased and chemically treated. After application, white thermosetting acrylic resin paint? Apply it, heat dry it, and preheat it?
Use said transfer film on the surface? King, pattern 1 @
ff transcribed. Acrylic oligomer on this surface?
Ultraviolet curing transparent paint as the main ingredient? Apply and UV range?
It was irradiated and hardened. The decorative steel sheet obtained in this way is
It has a hard surface hardness of 5H, making it a highly decorative product as a surface material for whiteboards.

(Example 5) Polypynylphytyral resin is coated on the surface of a 25μ thick PET film. Screen ink as a binder?
Is it used to create a frame-like pattern? Is the gravure ink printed with polyvinyl butyral by a rotogravure printing machine consecutively printed at equal intervals ~ 611? Use wood grain pattern? The mark is 1dll L.

At this time, use the acrylic adhesive peeling agent used for normal transfers) 1! 'a', preset fi! Rem? Transfer foil used? This was produced as a comparative example.

Next are these transfer foils? A decorative steel plate was prepared using the same method as shown in Example 1. Created.

Next, test its performance? The result? show.

As described above, a decorative steel sheet with excellent workability, adhesion, etc., and excellent design can be obtained in the form of a continuous coil.

(Effects of the invention) Does the present invention have various effects such as the following? 11) The transfer film has a cypress pattern with screen stamp-1 and a pattern with gravure stamp-2? What are the characteristics of each printing method? Since a multi-colored pattern can be created in one transfer, the cost of the final product is reduced.

(2) Because the transfer film is marked in advance, screen printing requires less energy to dry the ink than when printing directly on the steel plate, resulting in higher printing efficiency. Therefore, printing costs can be kept low.

13) Because the gravure stamp is placed on the transfer film, it is much more precise and has a higher reproducibility of the manuscript than when printing one page on a steel plate using the gravure offset method.

14) Transfer film? Is it possible to make only the required amount by making it in advance and storing it? It is possible to make a large number of products by transfer, and therefore, it is possible to produce a large variety of products very efficiently.

15) Peel off the transfer film with a gravure coat or roll coat! Since no ax is provided, the transfer film control process is simple and the cost is therefore low.

Also, there is no peeling layer, just an ink layer? Because it is transferred, the processing performance of the product does not deteriorate.

Especially polyvinyl butyral resin as a binder for screen ink and gravure ink? If used, P.E.
Is there a release coat layer in advance for direct release from the T film?
There is no need to provide one, which is advantageous in terms of cost and performance.

161 Since a continuous coiled product is obtained, 2
The efficiency of the next processing is good and it helps in lowering the total cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a decorative steel plate produced by the method of the present invention, and FIG. 2 is a schematic cross-sectional diagram of a transfer foil produced by the method of the present invention. Is Figure 3 the state in which it is transferred to the steel plate? The cross section shown is 4 types 1 s? Each is shown below. Il+...Steel plate (2)...Base coating film 14 13)...Gravure ink layer f41...Screen ink layer (5)...Transparent resin layer (6)...Base film (7) ...Transfer film

Claims (3)

[Claims] (1) A method for manufacturing decorative steel sheets consisting of the following steps. [1] A step of printing an arbitrary pattern on the surface of the base film using a screen printing method using an ink whose binder is a thermoplastic resin that has releasability to the base film. [2] On the entire surface of the base film, an ink containing a thermoplastic resin as a binder that has releasability to the base film and has adhesion to the screen printed pattern and the base coating film in the next step is used. The process of printing an arbitrary pattern layer using the gravure printing method. [3] A step of forming a base coating layer on the surface of a steel plate coil that has been subjected to necessary pretreatment. [4] A step of thermocompression bonding the transfer film obtained in steps [1] and [2] above to the base coating layer on the surface of the steel plate coil to transfer the pattern layer. [5] A step of applying a transparent resin to the surface of the steel plate on which the pattern layer has been transferred and curing it. (2) The method according to claim (1), wherein the transparent resin is a thermosetting resin coating. (3) The method according to claim (1), wherein the transparent resin is an ultraviolet curable resin coating.