JPH0134667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an uneven decorative material, and in particular, a method for producing an uneven decorative material, which prevents curing inhibition of ultraviolet curable resin due to the color of the base material, and forms an uneven pattern that is in tune with a picture pattern. This invention relates to a method of transferring a picture pattern.

Conventionally used methods of transferring a picture pattern and forming irregularities that match the pattern include the so-called valley dyeing method, in which a coloring agent is applied only to the convex portions of the embossing roll, and the coloring agent is transferred at the same time as embossing. There are methods such as applying a foaming suppressor or foaming accelerator to a foamable resin composition, but these methods cannot use thin substrates, cannot express fibrous irregularities, and have problems with the edges of concave and convex parts. It had drawbacks such as not being sharp.

After that, an ultraviolet curable resin is applied to the base material, a transparent film patterned with ultraviolet shielding ink is placed on top of it, and after the resin is cured by irradiation with ultraviolet rays, the transparent film is peeled off. ,
A method of transferring a pattern and forming unevenness by using a difference in curing speed of resin has been proposed. However, with this method, it is necessary to change the ultraviolet irradiation conditions depending on the hue of the base material, and if the color of the base material is uneven, the curing of the resin will be uneven, resulting in uneven sharpening, Surface smoothness, gloss, etc. were impaired.

The present invention has been made to solve the above-mentioned drawbacks, and instead of applying an ultraviolet curable resin to a base material as in the conventional method, it is applied to a transparent film and irradiated with ultraviolet rays. This is intended to eliminate uneven curing of the ultraviolet curable resin due to the color of the base material.

A detailed explanation will be given below with reference to the drawings.

FIG. 1 is a schematic diagram illustrating the steps of the manufacturing method according to the present invention.

First, flexible, transparent, colorless or colored films with release properties include general polyvinyl chloride, polyvinyl alcohol, polypropylene, polyethylene, polystyrene, polyacrylic, polyvinylidene chloride, polytetrafluoroethylene, Polyester, polyamide, polyformaldehyde, polyvinyl acetate, polyvinyl acetal, cellophane, vinyl fluoride, nylon,
Vinylidene chloride or the like can be used, and a release layer can be provided on the surface if necessary. Next, a picture pattern 2 is printed on these films having release properties by a general printing method such as gravure printing, flexo printing, offset printing, screen printing, etc. At this time, the coloring agents are carbon black, zinc white, zinc oxide, lead oxide, red iron oxide, titanium white,
An ink containing a light-shielding colorant with a high ultraviolet absorption rate such as

It should be noted that any binder resin for the ink can be used as long as it has good adhesion to the ultraviolet curable resin and has good mold releasability and transferability.

The ultraviolet curable resin 3 is applied to the patterned surface of the transparent film 1 having the above-mentioned releasability using a general coating method such as a roll coater, gravure coater, knife coater, etc.

The UV-curable resin may be a mixture of photopolymerizable monomers, oligomers, or polymers with a polymerization initiator, as long as it can be cured by UV rays, and is generally unsaturated polyester-based, vinyl chloride acetic acid, etc. Resins such as vinyl, acrylic, urethane, epoxy, and Spirac resins can be used.

Appropriately, the coating thickness is about 10 to 100μ; if it is less than 10μ, the effect of unevenness cannot be expected much, and if it is more than 100μ, the irradiation time will be long. However, if the irradiation conditions are changed, such as by increasing the number of irradiation devices or slowing down the irradiation speed, it is of course possible to achieve a thickness of 100μ or more.

After applying the ultraviolet curable resin, it is passed through a primary ultraviolet irradiation section 5 to partially cure the resin.

Since the irradiation here is carried out from the side of the transparent film 1, the ultraviolet curable resin on the back side of the pattern 2 is hardly cured, and the ultraviolet curable resin in the non-patterned area begins to cure, but the irradiation conditions here are It is necessary to keep the amount to such an extent that the adhesion between the ultraviolet curable resin and the base material is not impaired when the base material 4 is pressure-bonded and coated in the next step.

By such first irradiation with ultraviolet rays, the ultraviolet curable resin begins to harden without being affected by the light absorption rate of the colored base material.

Next, the film is stacked on the light-shielding base material 4 with the paint-coated side thereof facing, and the two are laminated by passing through the pressure bonding part 6.

Examples of the base material having light shielding properties include flexible films such as polyvinyl chloride film, polystyrene film, and acrylic film, paper sheets such as paper and synthetic paper, plywood, particle board, pulp cement board, A plate-shaped base material such as a gypsum board or a metal plate, a composite of these materials, or a material with a pattern applied to each can be used.

After lamination, the resin layer is passed through a secondary ultraviolet irradiation section 7 to almost complete curing of the ultraviolet curable resin layer, and then the transparent film is peeled off at a peeling section 8.

By this second ultraviolet irradiation, the ultraviolet curable resin layer is brought into complete contact with the base material 4, and the resin under the pattern is attracted to the fast-curing area around it, forming a recess. When the transparent film is peeled off, the picture pattern is transferred to the surface of the resin layer, and an uneven pattern is formed with the transferred portions as depressions.

In addition, when the required physical properties of the surface of the decorative material are severe,
By passing the transparent film through the tertiary ultraviolet irradiation section 9 and the heating section 10 after peeling off the transparent film, the ultraviolet curable resin, especially the resin in the concave portions, can be completely cured.

The present invention having the above configuration has the following effects.

(1) Since UV curable resin paint is applied to a transparent film and irradiated with UV rays, there is no uneven hardening of the resin due to differences in light absorption of the colored base material.

(2) Since the transferred ink is integrated with the ultraviolet curable resin during the curing process, surface properties such as solvent resistance are extremely good.

(3) Surface performance can be further improved by passing through a tertiary ultraviolet irradiation section or a heating section, and it is also possible to increase the curing speed by using the above two steps together.

Example 1 Wood grain conduit grooves were printed on one side of a stretched polypropylene film with a thickness of 20 μm using ink containing carbon black as a coloring agent, and an acrylic ultraviolet curable resin was applied to the printed surface to a thickness of about 20 μm. , ultraviolet rays were irradiated for 5 minutes using an ultraviolet irradiation device with a capacity of 80 W/cm and a light intensity of 100 mW. Then thickness 80μ
It was layered and pressed onto a colored vinyl chloride film with a wood grain base pattern printed on it, and irradiated with ultraviolet rays for 5 minutes under the same conditions as before. After irradiation, the stretched polypropylene film was peeled off, and then ultraviolet rays were irradiated for 10 seconds under the same conditions as before to obtain a textured decorative material.

Example 2 A release layer was provided by coating polyamide resin on a 12μ thick polyester film, and wood grain conduit grooves were printed on the release layer using ink containing red iron oxide and titanium as colorants, and epoxy resin was applied on top of the release layer. After applying the ultraviolet curable resin to a thickness of 10μ, Example 1
irradiated with ultraviolet rays under the same conditions as above, and then reduced the basis weight to 30g]
After applying urethane and aminoalkyd resin to a ^m2 base paper and sealing it, it was layered on top of a printed wood grain base pattern and pressed, then irradiated with ultraviolet rays under the same conditions as Example 1, and then the polyester film was peeled off. A textured decorative material was obtained.

Example 3 Wood grain conduit grooves were printed on a 100 μ thick polypropylene film using ink containing iron oxide as a coloring agent, and after coating the printed surface with 200 g/m ² of unsaturated polyester ultraviolet curable resin, the capacity was increased.
Ultraviolet rays were irradiated for 30 seconds using an ultraviolet irradiation device with a light intensity of 80 W/cm and a light intensity of 100 mW.

Next, a 2.7 mm thick lauan plywood was coated with urethane paint to seal it, a colored base layer was applied on top of it, the above film was stacked and pressed with the resin coated side facing the plywood, and then the front layer was sealed. Ultraviolet rays were irradiated for 60 seconds under the same conditions as above.

After irradiation, the polypropylene film was peeled off and then heated for 60 seconds in a hot air dryer at 150°C to obtain a textured decorative material.

Example 4 Instead of sealing lauan plywood with urethane paint and applying a colored base layer on top of it, paper with a basis weight of 23 g/m ² printed with a wood grain base pattern was pasted onto the lauan plywood using an adhesive. An uneven decorative material was obtained in the same manner as in Example 3 except that.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating the steps of the manufacturing method according to the present invention. 1...Transparent film, 2...Picture pattern, 3...
UV curable resin, 4...Base material, 5...Primary ultraviolet ray irradiation part, 6...Crimping part, 7...Second ultraviolet ray irradiation part, 8...Peeling part, 9...Third ultraviolet ray irradiation part Irradiation section, 10... heating section.

Claims (1)

[Scope of Claims] 1. A transparent film with releasability is provided with a picture pattern with light-shielding properties, an ultraviolet curable resin paint is applied thereon, and then primary irradiation of ultraviolet rays is performed from the side of the transparent film. The paint is partially cured over time,
Next, the film is pressure-coated onto a base material having light-shielding properties with the paint-coated surface facing the base material, and then secondary irradiation with ultraviolet rays is performed from the side of the transparent film to almost cure the resin paint layer. A method for producing a decorative material, which comprises peeling off a transparent film to transfer the picture pattern onto the surface of the resin paint layer after completing the process, and at the same time forming recesses in the picture pattern area. 2. The method for producing a decorative material according to claim 1, characterized in that after peeling off the transparent film, tertiary irradiation with ultraviolet rays and/or heating is performed to complete curing of the resin coating in the recessed portions.