JPH0482711A - Production of wpc veneer - Google Patents

Abstract

PURPOSE:To enable graining to be performed without any problem associated with production cost or production efficiency, by coating a surface of a veneer with a coloring agent, drying the coloring agent, and treating the veneer to form WPC. CONSTITUTION:A liquid coloring agent 2 is applied to a wood grain part of a surface of a veneer 1. The coloring agent 2 may be, for example, a pigment insoluble in a WPC resin. Preferably, the coloring agent 2 is prepared by mixing a pigment in a resin. After being applied to the surface of the veneer 1, the coloring agent 2 permeates into vessels of wood. Because the diameter of the vessels is very small in a summer wood part of the wood grain, the coloring agent 2 can permeate into the vessel parts in the summer wood part to color the vessel parts, thereby graining. The application of the coloring agent 2 to the veneer 1 is followed by curing and drying, whereby the resin of the coloring agent 2 is hardened or solidified.

Description

[Detailed description of the invention] [Industrial application field]

The present invention is based on WPC (wood plastic C).
The present invention relates to a method for manufacturing a treated WPC veneer.

[Conventional technology] In veneers such as oak that have conduits, the diameter of the conduits is large in the spring wood of the wood, and the diameter is very small and inconspicuous in the autumn wood of the wood (for this reason, the diameter of the conduits is very small in the autumn wood of the wood). Therefore, when the veneer is colored, the coloring agent will penetrate much more into the spring wood ducts than the fall wood ducts, and only the spring wood parts can be colored. Wood graining can be done to emphasize the wood grain pattern. In addition, when using veneer as a board for flooring, etc., properties such as water resistance, durability, and dimensional stability are required, so the veneer is impregnated with WPC resin such as unsaturated polyester resin. WPC treatment is performed to harden it. In manufacturing such a WPC veneer, the following method has conventionally been used to grain the veneer. One method is to mix a coloring agent into the WPC resin and color the veneer at the same time as the WPC resin is infiltrated into the veneer. In this method, since the WPC resin penetrates into the conduit portion in a large amount, the conduit portion can be colored with a coloring agent mixed with the WPC resin to bring out the wood grain. Another method is to infiltrate the veneer with clear WPC resin, wash the wood with acetone, etc. to wash out the WPC resin that has penetrated into the conduit, and then apply colored resin over the veneer. In this method, the WPC resin is washed out from the pipe, so if you overcoat the colored resin, the colored resin will only penetrate into the pipe and color it. It is possible to carry out wood graining. [Problem to be solved by the invention]

However, in the former method, in order to color the WPC resin,
It is necessary to prepare many types of WPC resin for each color to be colored, and it is also necessary to prepare many types of tanks for injecting WPC resin into the veneer for each color, which poses problems in terms of production costs. was there. In addition, in the latter method, when washing away the WPC resin with acetone, it is necessary to insert a spacer for each veneer so that the acetone can sufficiently act on the veneer, which requires the complicated work of setting the spacers. This created a problem in terms of production efficiency. The present invention has been made in view of the above points, and it is an object of the present invention to provide a method for manufacturing a WPC veneer that allows coloring to bring out the wood grain without causing problems in production cost or production efficiency. It is something.

[Means to solve the problem]

The method for manufacturing a WPC veneer according to the present invention is characterized by applying a coloring agent to the surface of the veneer, drying it, and then subjecting the veneer to WPC treatment. The present invention will be explained in detail below. The veneer 1 is obtained by slicing a piece of wood, and the preferred wood species is oak, which has a conduit portion.In the present invention, first, a liquid coloring agent is applied to the wood grains on the surface of the veneer 1. The colorant 2 to be applied with the colorant 2 is a pigment that does not dissolve in the WPC resin, and it is preferable to use the colorant 2 prepared by mixing the pigment with the resin. After curing, it is WP
The coloring agent 2, which is preferably an acrylic emulsion resin that does not dissolve in the C resin, can be applied by passing the veneer 1 through a roll coater 3 formed by a sponge roll, as shown in FIG. When the colorant 2 is applied to the surface of the veneer 1 in this way, the colorant 2 penetrates into the conduit, but the conduit is formed with a large diameter at the spring wood part (conduit part) of the wood grain. Since the diameter of the autumn wood part of the wood grain is very small, the coloring agent 2 can fully penetrate into the conduit part and color the conduit part, making it possible to bring out the grain of the wood. After the coloring agent 2 is applied to the veneer 1 in this manner, the resin of the coloring agent 2 is cured or solidified by curing and drying. Next, the 21st! As shown in I, this veneer 1 is placed in a processing tank 4 such as a pressure regulating tank, the pressure is first reduced, then the pressure is increased, and the WPC treatment is performed by injecting the WPc resin into the veneer 1.The WPC resin contains pigments. A clear unsaturated polyester resin that does not contain is used. After the WPc resin is semi-cured, the veneer 1 is placed on the surface of a base material such as plywood using an adhesive, and the WPC resin is completely cured by applying heat and pressure, and the veneer 1 is bonded to the base material. Furthermore, by polishing the surface of the veneer 1 to remove the coloring agent 2 adhering to the surface, the wood grain is brought out so that the difference in the degree of coloring between the conduit part and other parts becomes clear. It is possible to obtain architectural boards used as flooring materials and the like.

[For use]

WPC colored with wood grain as described above
When manufacturing veneers, coloring is done by applying colorant 2 to veneer 1.
As in the case of mixing a coloring agent with WPC resin, w
There is no need to prepare a large number of PCM oils and tanks, and production costs do not increase, and WP
There is no need to use a spacer, which is required when coloring the C resin after washing it off from the veneer with acetone or the like, and the production efficiency does not deteriorate. Also, add 2 parts of the colorant to 1 part of the veneer.
For coating, existing equipment such as the roll coater 3 can be used as is, and equipment investment will not be a problem.

【Example】

Next, the present invention will be specifically explained with reference to Examples. Colorant 2 was prepared by using a 1.0 mm thick oak veneer 1 and containing 70 parts by weight of water, 30 parts by weight of acrylic emulsion, and 5 parts by weight of pigment. was applied onto the surface of the veneer 1 using a sponge roll coater 3 in an amount of 80 to 120 g/m2, and was cured for 12 hours and dried until the moisture content became 6% or less. Next, this veneer 1 is placed in a treatment tank 4, and the pressure is reduced to 10 torr or less for 1 hour, and then the pressure is increased to 18 kg/cm2 for 1 hour to perform WPC treatment in which unsaturated polyester resin is injected into the veneer 1. The veneer was heated at 90° C. for 15 minutes to semi-cure the unsaturated polyester resin. After this, apply one layer of water-based vinyl urethane adhesive to the surface of the plywood.
The unsaturated polyester resin is cured and the plywood is formed by applying the resin at a coating weight of 00 to 120 g/m2, overlaying the veneer 1 on top, and heating and pressurizing it for 3 minutes at 130°C and 8 kg/cm2. Veneer 1 was adhered to. Finally, the surface of the veneer 1 was sanded with #180 sand and then sanded and polished with #240 sand to bring out the grain of the veneer 1.

【Effect of the invention】

As mentioned above, in the present invention, a coloring agent is applied to the surface of the veneer and dried, and then the veneer is treated with WPC, so that a WPC veneer with coloring to bring out the wood grain can be manufactured. In doing so, coloring can be done by applying a coloring agent to the veneer, which eliminates the need to prepare a large number of WPC resins and tanks, unlike when using a mixture of colorants with WPC resin. This eliminates the need to increase production costs, eliminates the need to use spacers as in the case of washing the WPC resin from a veneer with acetone, etc., and then coloring it, thereby eliminating deterioration in production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the colorant coating process of the present invention, and FIG. 2 is a schematic diagram showing an example of the WPC treatment process of the same. 1 is a veneer, and 2 is a coloring agent.

Claims (1)

[Claims] (1) A method for producing a WPC veneer, which comprises applying a coloring agent to the surface of the veneer, drying it, and then subjecting the veneer to WPC treatment.