JPS6380883A - Preparation of wooden building material - Google Patents

Abstract

PURPOSE:To prepare a wooden building material approximate to a natural cedar by imparting gloss to a grain part, by coating the surface of a red hinoki material with paint having a rapid curing such as ultraviolet curable paint. CONSTITUTION:Red hinoki veneer 2 is adhered to a base late 1 such as plywood and, after embossing treatment is applied thereto, ultraviolet curable paint, for example, polyester type paint is applied to the surface of the red hinoki veneer 2 by a roll coater 3. The veneer 2 after coating is passed through an ultraviolet curing apparatus, wherein a plurality of mercury lamps are parallelly arranged in a tunnel, to cure the paint 4. When the paint having a fast curing speed is used as mentioned above, the paint 3 is cued on the surface of the red hinoki veneer before sucked in said veneer and, therefore, gloss is imparted to a grain part and the grain is made conspicuous and a wooden building material having arbitrary hue, an excellent antistaining property and high decorative effect is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing wooden building materials such as ceiling materials for Japanese-style rooms.

[Background technology]

Traditionally, natural cedar, which has a clear grain and a unique shine, has often been used as ceiling material for Japanese-style rooms.

However, due to the depletion of natural cedar in recent years and the corresponding rise in prices, there has been a need for a new ceiling material to replace natural cedar.

[Purpose of the invention]

An object of the present invention is to provide a method for producing a new wooden building material that can replace natural cedar.

[Disclosure of the invention]

The method for producing a wooden building material of the present invention is characterized in that the surface of red cypress wood is coated with a fast-curing paint to obtain a wooden building material that resembles natural cedar.

That is, as a result of intensive study on various tree species to replace natural cedar, the present inventor focused on red cypress wood, which can be obtained at a relatively low price. It has the drawbacks of poor visibility, poor color tone, and easy staining, so it could not be used as is for ceiling materials, etc. Therefore, the inventor of the present invention painted the surface of the red cypress wood with a paint that hardens quickly, so that the paint hardens on the surface of the red cypress wood before being sucked into the interior of the red cypress wood. It can add shine and make the wood grain stand out, and it is also possible to obtain any color tone, and it also has excellent stain resistance, making it suitable for use as a highly decorative wooden building material such as ceiling material. They discovered a new fact that it can be used suitably and completed this invention.

Examples of the coating material having a fast curing speed include photocurable coating materials and, in particular, ultraviolet curable coating materials such as polyester-based coatings.

FIG. 1 shows a process for producing a wooden building material according to the present invention using such an ultraviolet curable paint.

That is, as shown in FIG. 1, a red cypress veneer 2 is pasted on a base plate 1 such as plywood, and after a floating process (sangu process) is applied, the surface of the red cypress veneer 2 is coated with a roll coater 3. The ultraviolet curable paint 4 is applied and cured by passing through an ultraviolet curing bag W5 in which a plurality of mercury lamps are arranged in parallel inside the tunnel.

In this case, the coating amount of the ultraviolet curable paint 4 is 0.7 to I
g/shaku'' (7.6 to 10.9 g/m'') is preferable in order to impart shine only to the wood grain. Application amount is 0.7
If it is less than Ig/shaku2, most of the paint will be sucked into the red cypress veneer 2 before it hardens, making it impossible to produce shine, and if the amount exceeds Ig/shaku2, it will damage the wood grain area. Shine will appear on both the spring wood and the spring wood. In other words, the shine in the wood grain area is due to the difference in paint absorption between the wood grain area and the spring wood area, and the wood grain area with a high density (summer wood area) has a higher density than the spring wood area with a lower density. This method takes advantage of the fact that the paint suction speed is low. However, in order to cure only the paint applied to the wood grain area before it is sucked into the interior, it is preferable to use a paint with a somewhat low viscosity and a fast curing rate. , one that completes curing within 10 seconds is desirable.

Next, the method for manufacturing a wooden building material of the present invention will be described with reference to Examples.

Example: A red cypress veneer (thickness: 0.20 mm) was laminated onto plywood, and after a floating process, a polyester-based ultraviolet curable paint (trade name manufactured by I = Material ■) was applied to the surface of this board III. A coating composition based on "Aurex 665-Clear") was prepared, and this was applied at 0.8±0.1g/scale.
(8.72 g/m").

The coating composition used is as follows.

(Components) (Parts) Paint 100 Colorant E, Brown 0.5 Yellow 0.8 Black 0.04 The viscosity of this paint composition was 20±5 seconds (Iwata Cup).

After the paint was applied, it was immediately passed through an ultraviolet curing device to cure the paint. At this time, the time until curing is 5 seconds. The ultraviolet curing device had six 80 W/cm mercury lamps installed in parallel in a tunnel, and the red cypress veneer was passed through this at a line speed of 40 m/min.

The thus obtained painted red cypress veneer has shine only in the wood grain, stands out from the wood grain, and has a beautiful color tone.
It can be used as an interior wooden building material such as ceiling materials, and has extremely good stain resistance.

〔Effect of the invention〕

According to this invention, by painting the surface of the red cypress wood with a fast-curing paint, the paint hardens on the surface of the red cypress wood before being sucked into the interior of the red cypress wood. It is a highly decorative wood that can replace traditional natural cedar by adding shine and making the wood grain stand out, and it is also possible to obtain any color tone.It also has excellent stain resistance. It has the effect of being suitable for use as a building material.

[Brief explanation of the drawing]

FIG. 1 is a process explanatory diagram showing a method for manufacturing a wooden building material according to the present invention. 1... Base plate, 2... Red cypress veneer, 4... Ultraviolet curing device material, 5... Ultraviolet curing device

Claims (2)

[Claims] (1) A method for producing a wooden building material, which comprises painting the surface of red cypress wood with a paint that hardens quickly. (2) The method for producing a wooden building material according to claim (1), wherein the paint is an ultraviolet curable paint.