JPS5856483B2 - Manufacturing method of WPC veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a WPC veneer, and is characterized by destroying the wood structure of the spring wood portion of the veneer, impregnating the veneer with a polymer, and drying the veneer. The present invention relates to a method for manufacturing a WPC veneer.

Recently, WPC (Wood
Plastic combinations (wood-plastic composites) are attracting attention because of their excellent ability to modify wood.

However, when manufacturing WPC veneers, when impregnating the veneer with polymer, the spring wood part of the veneer has a soft and rough structure, so the polymer penetrates in large quantities, and the structure of the summer wood part of the veneer is poor. Being hard and dense, polymers are difficult to penetrate.

Therefore, the color of the spring wood becomes darker due to the penetration of a large amount of polymer and becomes closer to the color of the summer wood, and the difference in color between the spring wood and summer wood becomes smaller and the wood grain becomes unclear. there were.

The present invention has been made in view of the above points, and it is possible to reverse the shading relationship between the spring wood part and the summer wood part by actively coloring the spring wood part, thereby making the wood grain clearer. The purpose of the present invention is to provide a method for manufacturing a WPC veneer that can be used to color the spring wood part darker than the summer wood part using the above-mentioned polymer.

The present invention will be explained in detail below with reference to Examples.

The veneer is obtained by rotary lace or slicing raw wood, and this veneer is first dried to a moisture content of 15 to 18.

Next, a floating process is applied to this veneer. As shown in Figure 1, floating processing is performed by passing the veneer 1 between a hard roll 2 made of metal or the like and a soft roll 3 made of rubber. Since the spring material part is soft and the summer material part is hard, the spring material part is strongly compressed by the soft roll 3, and the summer material part has a strong force resisting the compression.
As shown in the figure, the spring wood portion has concave portions 4 and the summer wood portion has convex portions 5, forming an uneven pattern on the veneer 1.

When the spring material receives the compressive force of the soft roll 3 in this way,
The wood structure of the spring wood will be destroyed.

Incidentally, the angle α= as shown in FIG. 3 is formed on the outer peripheral surface of the hard roll 2.
By forming the inclined grooves 6 of 12 to 13 degrees, it is possible to prevent the floating veneer 1 from curling.

After processing to destroy the wood structure of the spring wood, polyethylene resin (called PE resin) is applied to the veneer as a polymer.
Impregnate.

At this time, styrene monomer is also impregnated.

The styrene monomer is used to facilitate impregnation of the polymer into the veneer.

When a veneer is impregnated with PE resin and styrene monomer,
The structure of the spring wood is coarse, so both PE resin and styrene monomer penetrate well, but the structure of the summer wood is dense, so PE resin with high viscosity is difficult to penetrate, and only the styrene monomer penetrates. That will happen.

In addition, since the wood structure of the spring wood part is destroyed by the above operation, the impregnation rate of PE resin is much higher than in the conventional case, and a much larger amount of PE resin is absorbed into the spring wood part than in the conventional case. to penetrate.

Next, this was left in a drying room for 23 minutes at 100°C, 16 minutes at 110°C, and 10 minutes at 120°C to cure the PE resin and vaporize the styrene monomer. let

When the PE resin is cured in this way, the refractive index within the wood becomes constant because the PE resin has penetrated into the wood, and the spring material impregnated with the PE resin becomes transparent. At the same time, the summerwood part which is not impregnated with PE resin remains opaque.

The spring wood becomes transparent like a box, but since PE resin is originally amber-colored, the color of the spring wood, which contains a large amount of PE resin, becomes darker, and in the summer when almost no PE resin is impregnated. The wood parts are not colored.

In addition, since the wood structure of the spring wood has been destroyed, it is impregnated with a larger amount of PE resin as described above, so the spring wood is colored much darker than in the conventional case. The color of the wood part is darker than that of the summer wood part, the manufacturing method of the spring wood part and the summer wood part is reversed, and the difference in the manufacturing method of the spring wood part and the summer wood part is clearly visible, resulting in a so-called wood with a clear grain. It makes it stand out better.

A coloring agent may be added to the PE resin to further improve the wood grain.

Further, by drying the impregnated veneer as described above, the hardness of the veneer is improved by 20 to 30 on a Percoll hardness meter.

Next, the above-mentioned veneer is built up on a substrate such as plywood, overcoated with thermosetting resin or other materials such as 100 parts by weight of styrene monomer and 3 parts by weight of benzoyl peroxide (BPO), and styrene is formed by hot pressing. The monomer is cured into polystyrene and the PE resin impregnated into the veneer is completely cured.

In this way, a WPC board is obtained.

As mentioned above, in the present invention, the veneer is impregnated with a polymer after destroying the wood structure in the spring wood portion of the veneer, so that the ease of penetration of the polymer into the spring wood portion is increased by adding to the roughness of the structure. The color of the spring wood is further increased by destruction of the tissue, and by taking advantage of the property that the polymer easily penetrates into the spring wood and the color becomes darker, the spring wood is made even darker than before, and the spring wood and summer wood are separated. By reversing the relationship between shading, it is possible to create a contrast in shading between the spring wood and summer wood, which clearly reveals the wood grain, emphasizes the wood texture, and increases the product value.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a floating processing device, Fig. 2 is a diagonal copy of a veneer subjected to floating processing, and Fig. 3 is a front view of a hard roll used in the floating processing device. It is made of veneer.

Claims (1)

[Claims] 1 After destroying the wood structure of the spring wood part of the veneer, impregnating this veneer with a polymer, drying this veneer, and coloring the spring wood part in a darker color than the summer wood part with the polymer. Characteristic WPC veneer manufacturing method.