JPH0653260B2 - Molding method for UV cured film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for forming an ultraviolet-curing film formed on a surface of a synthetic resin product by coating. (EN) Provided is a molding method for satisfactorily molding an ultraviolet-curing film applied to the surface of a synthetic resin product in order to enhance the mechanical strength and gloss of the surface of the synthetic resin product.

[Conventional technology]

The surface of synthetic resin products did not have a sufficiently high hardness because the hardness of the synthetic resin material was not sufficient, and in most cases, the surface hardness was dissatisfied.

As a means for effectively eliminating the low surface hardness of the synthetic resin product, there is a means for coating and molding a UV coating film formed on the surface of the synthetic resin product with an ultraviolet curable paint (hereinafter simply referred to as UV paint). It has been adopted.

The UV coating film formed by coating with UV paint has a large adhesive force to the synthetic resin product body and has sufficient hardness, so the mechanical strength of the surface of the synthetic resin product body can be sufficiently enhanced and the transparency is higher. Therefore, it has many excellent effects such as not impairing the decorative property of the surface of the synthetic resin product.

There are spray coating method, silk printing method, roller coating method, etc. as a method for coating and coating the surface of the synthetic resin product of the UV paint formed on this UV coating, such as the structure and surface of the synthetic resin product. One of the above-mentioned methods has been selected depending on the shape and the required difference in the thickness of the UV coating film.

[Problems to be solved by the invention]

However, in the case of the spray method, which is considered to be the best among the above-mentioned UV coating molding methods, among the extremely expensive UV paints sprayed to coat and mold the UV coating on the surface of the synthetic resin product. However, only a part of the UV coating is actually molded, and the remaining sprayed UV paint is discharged to the outside as it is, so it is wasted without being molded into the UV coating. The amount of expensive UV paint is large, and when the UV coating film is formed by the spray method, the cost required for the UV paint to be used becomes enormous and the waste UV paint is used. There is an inconvenience of causing environmental pollution of the work environment, and further, a large-scale duct facility is required to prevent this pollution of the work environment, which results in enormous equipment cost.

In addition, in the case of the silk method and roller coating method for forming a UV coating film, there is a serious problem that the quality of the UV coating film formed by coating is not stable and defective products are frequently generated. There are drawbacks that the equipment for forming the coating film is complicated and difficult to handle.

Furthermore, it is not possible to uniformly form a UV cured film having a large film thickness at a specified location, and therefore, it is possible to effectively exhibit the excellent mechanical strength of the UV cured film which increases as the film thickness increases. I was dissatisfied that I could not do it.

The present invention was devised to solve the problems, drawbacks, and inconveniences of the above-described conventional example, and utilizes the coating power of the UV paint as a liquid to apply UV to a UV-coated body uniformly impregnated with the UV paint. A paint is applied to the surface of a synthetic resin product so that a UV coating film having a uniform film thickness can be formed satisfactorily and easily. A UV cured coating film can be formed inexpensively and satisfactorily and easily. The purpose of the present invention is to make it possible to form a UV cured coating film with inexpensive equipment.

[Means and Actions for Solving Problems]

Hereinafter, the molding method according to the present invention will be described with reference to the drawings showing the coated body used for carrying out the method of the present invention.

The method for forming an ultraviolet-cured film according to the present invention comprises a sponge 2 having open cells on the surface of a washed product body 7 as a main component, and a coating body 1 having penetrability to a solvent-free UV paint T. The lower surface is applied to the coating body 1 by the UV
The coating film T is impregnated and impregnated from above, and by slidingly moving, the UV coating film 8 is coated and molded, and the UV coating film 8 coated and molded on the surface of the product body 7 is irradiated with ultraviolet rays. By doing so, the ultraviolet curable film is formed.

The coating body 1 can be uniformly impregnated with the UV paint T on the entire surface thereof, and a constant amount of the UV paint T oozes on the surface thereof. In the state where a certain amount of UV paint T oozes out, the application body 1 slides while contacting the surface of the product body 7,
The UV paint T that oozes out is also maintained when it is applied to the surface of the product body 7.

Further, the film thickness of the UV coating film 8 applied to the surface of the product body 7 is determined by the degree of penetration of the UV coating T into the coating body 1, and therefore the physical properties of the coating body 1 or the UV coating T are determined. By appropriately setting the penetrability of the UV coating material T to the coating body 1, the UV coating film 8 having a desired film thickness is formed.

Since the entire coating body 1 is impregnated with the UV paint T, the coating body 1 is applied to the surface of the product body 7.
If the contact pressure of may change during sliding movement,
Since the amount of the applied UV paint T will change following this change in contact pressure, the surface of the product body 7 of the application body 1 must be formed in order to form a UV coating film 8 of uniform thickness. It is necessary to keep the contact pressure to be always constant.

Further, the coating body 1 which coats and molds the UV coating film 8 on the surface of the product body 7 reduces the absolute amount of the UV coating material T impregnated therein by molding the UV coating film 8. Since the pressure of the UV paint T in the application body 1 is reduced and the thickness of the UV coating film 8 to be formed is gradually reduced, the UV paint T is always supplied to the application body 1 at a constant rate. It has become so.

The sponge 2 which is a main component of the applicator 1 is preferably made of natural rubber or synthetic rubber because of its elasticity, and UV.
Since the paint T does not contain a solvent, even if the sponge 2 is made of natural rubber or synthetic rubber, there is no danger of being attacked by the UV paint T, and suitable permeability can be maintained.

〔Example〕

The applicator 1 shown in the figure is configured to carry out the method of the present invention. A sponge 2 having open cells is provided at the center, and the cut cotton 3 is wrapped around the periphery of the sponge 2 excluding the upper surface. Provided, and also this sponge 2 and cut cotton 3
The periphery of the combination of the above and the combination is surrounded by a silk screen 4 used for silk printing, and the applicator 1 is assembled and fixed to a holder 5 that is movable along a guide shaft 9. is doing.

The holder 5 part for assembling and fixing the applicator 1 has an upright tubular shape, and the applicator 1 is assembled and fixed in the tubular part with the applicator 1 protruding from the lower opening. By forming a UV paint reservoir 6 whose upper surface forms a bottom surface on the upper part of the tubular portion and by arranging a constant amount of UV paint T in this UV paint reservoir 6 As soon as the UV paint T that has penetrated into 1 is consumed, the UV paint T in this UV paint reservoir 6 is immediately supplied into the applicator 1 so that the UV that has penetrated into the applicator 1 is absorbed.
The amount of paint T can be kept constant.

Further, the holder 5 is assembled to the guide shaft 9 in a structure capable of holding a fixed posture, and is also movably installed along the guide shaft 9. That is, it goes without saying that the holder 5 is positioned so that it can move parallel to the surface of the product body 7, and therefore the coating body 1 with the assembly fixed is always in constant contact with the surface of the product body 7. It is constructed so that it can be brought into sliding contact with pressure.

The combination structure of the holder 5 and the guide shaft 9 for the product body 7 is similar to the combination structure of the silk printing guide shaft and squeegee generally known in the past. An apparatus for carrying out the method of the present invention comprises:
It can be easily implemented by improving the above-mentioned conventional silk printing apparatus to have a simpler structure.

Next, an example of a work process which seems to be the simplest of the method of the present invention will be described.

A function part for assembling and holding the product main body 7 is provided at the peripheral end part, and along the rotation direction of the turntable which intermittently rotates at a constant center angle, the stop position of the product holding function part is sequentially set to the product supply position, Set the cleaning position, antistatic treatment position, UV paint application position, and product removal position, respectively.
The product main body 7 coated with the UV paint T taken out from the turntable is conveyed by a belt conveyor in a certain direction, and a pre-drying working section and an ultraviolet irradiation section are provided in this order on the belt conveyor.

By using the UV paint coating device configured as described above, the surface of the product body 7 supplied to the turntable can be sequentially and automatically cleaned and statically cleaned in accordance with the operation of the turntable and the belt conveyor. The product body 7 is taken out from the turntable, transferred to a belt conveyor and pre-dried, and the UV coating 8 on the surface of the product body 7 is hardened by antistatic treatment work and UV paint application work. Therefore, an ultraviolet curable film can be formed.

〔The invention's effect〕

As is clear from the above description, the method for forming an ultraviolet curable film according to the present invention does not waste the expensive ultraviolet curable coating material at all, so that the ultraviolet curable coating material can be economically consumed. As a result, the material cost required to complete one product can be reduced, and since the atomized UV-curable paint does not scatter into the work space as in the spray method, it causes environmental pollution. Therefore, a good working environment can be maintained, and as mentioned above, the UV curable paint does not become a mist and scatter. It is no longer necessary to install a safety facility to forcibly discharge it, and this can reduce the overall equipment cost, and further improve the physical properties of the coating material and the UV curable coating. By setting and combining it properly, not only can the thickness of the UV-cured coating film to be formed be set in a relatively wide range, but also a consistent and constant coating film can be easily and favorably formed. It has many excellent effects.

[Brief description of drawings]

The drawing is a longitudinal sectional view showing the structure of an embodiment of an applicator body which is constructed to be advantageous for carrying out the method of the present invention. DESCRIPTION OF SYMBOLS 1; Applicator, 2; Sponge, 3; Cut cotton, 4; Silk screen, 5; Holder, 6; UV paint reservoir, 7; Product body, 8; UV coating, T; UV paint.

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-57-4270 (JP, A) JP-A-54-131640 (JP, A) JP-A-53-144942 (JP, A) JP-A 61- 57267 (JP, A)

Claims (1)

[Claims] 1. A lower surface of a coated body, which is mainly composed of a sponge having open cells and has permeability to an ultraviolet-curable coating material containing no solvent, on the surface of a washed product body,
In a state in which the ultraviolet curable coating material is impregnated and impregnated into the coated body from above, the ultraviolet curable coating film is coated and formed by sliding and moving, and the ultraviolet curable coating film is irradiated with ultraviolet rays to form an ultraviolet curable film. A method for molding an ultraviolet curable film to be molded.