JPS6043184B2 - How to create an uneven pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for extremely efficiently creating a concavo-convex pattern that matches a pattern using a pollution-free and solvent-free ultraviolet curable paint.

Conventionally, various methods have been proposed for creating uneven patterns using ultraviolet curable paints.

One such method involves pressure embossing using an embossing roll after the paint has hardened. Although this method allows the creation of an uneven pattern very easily, it requires a lot of effort and expense to create the embossing roll, and it is extremely difficult to synchronize the pattern with the unevenness. Another method is to create a mask that matches the pattern using positive or negative film, overlap the mask over the pattern, and irradiate light onto it to create unevenness by varying the curing speed. be.

Although this method does not require a specially formulated ink, it has drawbacks such as the expensive mask plate and the inefficiency of manual registration. Another method is to partially create a pattern using ink mixed with a curing inhibitor, and then apply UV-curable paint on top of it to create unevenness by varying the curing speed. .

Although this method allows complete synchronization of the pattern and the irregularities, it has drawbacks such as insufficient physical properties of the suppressing part and problems with the stability of the suppressing ink. The present invention has been made to solve these various problems.

That is, an object of the present invention is to provide a new method for extremely efficiently creating a concavo-convex pattern that is in sync with a picture using an ultraviolet curable paint. The present invention will be explained with reference to the drawings. When using normal ink, as shown in Figure 1, a pattern is applied partially to a base material 1 using normal ink 2, and then any part of the pattern is polymerized. An ultraviolet curable paint 3 which has a large shrinkage rate during curing is applied, and then an ultraviolet curable paint 4 which has a smaller shrinkage rate during polymerization and curing than the ultraviolet curable paint 4 is applied over the entire surface.

Next, as shown in FIG. 2, the material is irradiated with ultraviolet rays to harden and at the same time, different shrinkage rates are created to form irregularities. In this case, the portion of the paint that has a large shrinkage rate becomes concave. When using an ultraviolet curable ink, as shown in FIG.
After partially printing, an ultraviolet curable paint 6, which is of the same radical polymerization type as the ink and has a relatively low shrinkage rate during polymerization and curing, is applied to the entire surface.

Next, as shown in FIG. 4, ultraviolet rays are irradiated to harden 5 and 6, and at the same time, the pattern part is depressed by the shrinkage of the part 'j and the shrinkage due to the copolymerization of 5 and 6, thereby forming the pattern. It forms unevenness that is perfectly synchronized with the surface. As the base material, paper, synthetic paper, resin-mixed paper, non-woven fabric, resin film, wood base material, fiberboard, inorganic base material, metal plate, etc. can be used as desired. Those that have been treated can also be used.

Generally, any ink can be used as long as it has adhesive properties to the base material.

Any ultraviolet curable ink can be used as long as it is a radical polymerizable ink whose main component is a prepolymer oligomer or monomer that exhibits a large shrinkage rate during polymerization.

To provide a pattern layer using regular ink or ultraviolet curable ink, known printing methods such as gravure printing and screen printing can be used, and the pattern layer provided can be any pattern such as a wood grain pattern, an abstract pattern, a weave pattern, etc. good.

The paint that forms the inner recesses of the UV-curable paint is mainly composed of prepolymer oligomers or monomers that have a high shrinkage rate during polymerization and curing, or prepolymer oligomers or monomers that have a high crosslinking density, and the paint that forms the convex parts is polymerized and hardened. The shrinkage rate of time is small! Any material whose main component is a repolymer oligomer or monomer, or a prepolymer oligomer or monomer with a low crosslinking density may be used.

It is also effective to reduce the shrinkage rate by mixing polymers such as acrylic, vinyl chloride, vinyl acetate, etc. as necessary. Note that the size of the shrinkage rate is relative; It is sufficient if there is a certain difference in shrinkage rate sufficient to form a difference in unevenness between the UV-curable ink and the paint that will form the convex portions, and between the UV-curable ink and the paint that will form the convex portions. Any method such as gravure coating, roll coating, curtain flow coating, etc. can be used as a coating method.The ultraviolet irradiation device used for polymerizing and curing the coating is a polymerization fluorescent lamp with an output of 1 W 1 cm. 30WIcm160WIC!Nl8OWlOll
High-pressure mercury lamps such as 6OWIO can be used as desired.

The method of the present invention uses a non-polluting, solvent-free ultraviolet curable paint to extremely efficiently create an uneven pattern that matches the pattern.

2. There is no need to use expensive embossing rolls or mask films.

3. Since no inhibitor is used, there is no possibility of poor physical properties due to uncured surface resin.

4. Irregularities can be formed using ink with a normal formulation.

5 When using ultraviolet curable ink, it is possible to form unevenness that perfectly matches the pattern.

It has the following effects.

The matching embossed decorative sheet or matching embossed decorative board manufactured by the present invention can be used for ceiling materials, flooring materials, and other interior materials.
Its uses are wide-ranging, including furniture materials and cabinet materials.

Next, examples of the present invention will be shown.

Example 1 Nitrified cotton+ was printed on 23yId thin paper using a gravure printing machine.
After creating a wood grain pattern with isocyanate-based ink, a sealer treatment is applied with an acrylic urethane-based paint, and then an ultraviolet curable paint with the following composition is applied to the conduit portion of the wood grain pattern using a gravure coater in an amount of 14yI. It was applied so that

Paint composition Acrylic oligomer (Aronix 8060 Toagosei Chemical) 7 Weight section 1●6
hexanediol diacrylate
2 parts by volume Trimethylolpropane acrylate 1 part by volume Benzoin ethyl ether 1 part by volume Next, an ultraviolet curable paint having the following composition was applied to the entire surface using a flow coater so that the coating amount was 30 yId.

Paint composition Acrylic oligomer (Viscoat 54 Hosaka Organic Chemical Industry) 5 parts Acrylic oligomer (Viscoat 230 Hosaka Organic Chemical Industry)
3-part hydroxyethyl acrylate
2 parts benzoin ethyl ether 1 part 2 parts Benzoin ethyl ether 1 part It was then irradiated with ultraviolet rays for an extended period of time from the height of the trough using a high-pressure mercury lamp with an output of 80 WIcm. As a result, a matching embossed wood grain decorative sheet with conduit portions formed as concave portions was obtained.

Example 2 Nitrified cotton +
After creating a wood grain pattern using isocyanate ink, a sealer treatment was performed using an acrylic urethane paint, and then an ultraviolet curable ink having the following composition was printed on the conduit portion of the wood grain pattern using a gravure printing machine.

Ink composition Dipentaerythritol hexaacrylate 3 parts by weight Carbon black 4 parts by weight Prepolymer obtained by reaction of 1 mole of pentaerythritol triacrylate and 1 mole of tolylene diisocyanate 5 parts by weight Benzophenone 1 part by weight Michler ketones
6 parts by weight Next, apply an ultraviolet curable paint with the following composition using a flow coater to a coating amount of 30yI.
It was applied to the entire surface so that the thickness was 771'.

Paint composition Acrylic oligomer (Aronix 8060 Toagosei Chemical Co., Ltd.) 6 parts Acrylic oligomer (Aronix 570 Toagosei Chemical Co., Ltd.)
2 parts hydroxyethyl acrylate 2 parts benzoin ethyl ether
One weighing section was then irradiated with ultraviolet rays under the same conditions as in Example 1, and as a result, a tone embossed wood grain decorative sheet in which the conduit portions were recessed portions was obtained.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views showing one embodiment of the present invention. Figure 1 shows the state before ultraviolet irradiation, Figure 2 shows the state after irradiation, and Figures 3 and 4 show another embodiment of the present invention. FIG. 3 shows the state after ultraviolet irradiation and FIG. 4 shows the state after irradiation. 1...Base material, 2...Normal ink, 3.
...Ultraviolet curable paint with high shrinkage rate during polymerization and curing, 4...Ultraviolet curable paint with low shrinkage rate during polymerization and curing, 5...Shrinkage rate during polymerization and curing UV-curable ink with a formulation that increases the size of 6...
Same as ink No. 5: UV-curable paint with the same radical polymerization type and relatively small shrinkage during polymerization and curing.

Claims (1)

[Scope of Claims] 1. A pattern layer is provided on a base material using normal ink, and then an ultraviolet curable paint that has a high shrinkage rate during polymerization and curing is applied to any part of the pattern layer, and then the ultraviolet curable coating is applied on top of the pattern layer. A UV-curable paint with a smaller shrinkage rate during polymerization and curing than the mold paint is applied to the entire surface, and then UV rays are irradiated to cure the UV-curable paint and at the same time, the difference in shrinkage rate during polymerization and curing is used to cure the UV-curable paint. A method for creating an uneven pattern characterized by forming unevenness. 2. A pattern layer is provided on the base material using an ultraviolet curable ink that has a large shrinkage rate when polymerized and cured, and then an ultraviolet curable paint that has a smaller shrinkage rate when polymerized and cured than the ultraviolet curable ink is applied to the entire surface, and then By irradiating ultraviolet rays, the ultraviolet curable ink and ultraviolet curable coating are cured, and at the same time the pattern layer is cured by shrinkage of the ultraviolet curable ink itself and shrinkage due to copolymerization of the ultraviolet curable ink and ultraviolet curable coating. A method for creating an uneven pattern characterized by forming unevenness that is synchronized with.