JP3532965B2 - Method of making wood-based decorative materials - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a decorative material, and more particularly to a method for producing a wooden decorative material using a veneer. 2. Description of the Related Art Conventionally, in order to adapt to a residential environment in which the sense of woodiness is respected, cosmetics using natural wood for horizontal surface members such as tables and counters, and vertical surface members such as wall materials. The material is used, and it is deeper than a so-called synthetic resin decorative board that expresses a wooden texture using printing paper, and there is a demand for a material utilizing the properties of the material. In this decorative material using natural wood, a veneer obtained by thinly slicing natural wood is attached to a base material such as a plywood or a particle board using an adhesive, and then the surface of the veneer is turned on. -One coated with burley paper, one coated with a polyester resin on the surface of a veneer, and one coated with a surface on a veneer are known. [0003] On the other hand, as natural precious woods and raw wood for excellent cosmetic materials are depleted worldwide, it is extremely difficult to obtain even high-density and dark-colored wood, even for veneer Atsugi. The veneer is generally colored to give the veneer of the material a sense of quality. As means for coloring, coloring with dyes and pigments, coloring with chemical agents, and the like are carried out. Desirable conditions required for colored veneers include high transparency and loss of woodiness. No coloring, uniform coloring to the inside, no adverse effect on the subsequent coating, good light resistance, and the like. [0005] However, in the former case of the prior art, it is necessary to transfer the adhesive or the resin contained in the overlay paper to the veneer. (100-160 ° C) and pressurization (10-80kg)
/ cm ² ) Not only is the equipment large due to the operation,
Since the veneer was not treated, the appearance of the finished product, for example, the three-dimensional appearance and the depth, was lacking and did not satisfy the needs of the market. [0006] Among the prior arts, the latter dye coloring has a high permeability and is colored up to the inside of the veneer but has poor light fastness. However, permeability and transparency are now a step. In addition, although coloring with a chemical agent can provide unique coloring, each has its own characteristics, such as complicated operability, but requires considerable skill and labor from the viewpoint of operability. [0007] Further, various documents relating to heat treatment have been proposed as an efficient dimensional stabilization method for wood, but it is desirable to treat in an inert gas stream. The latter products have not been widely used due to the large decrease in strength. Under the circumstances, the present invention has been studied on a wooden decorative material using a high-density veneer and a dark-colored veneer. As a result, a lightweight and recycled wood (early-wood) such as paulownia and falkata having strong fibrous materials is obtained. Utilizing a conventionally known consolidation method,
Further, they have found that the above-mentioned problem can be solved by fixing the shape, slicing the slice, and laminating and bonding the slice to a plate-like substrate. [0009] That SUMMARY OF THE INVENTION The present invention provides a process for preparing wood decorative material to be laminated adhesive on at least one side of the plate-shaped substrates to veneer, projecting plate from the following (A) (C)
It is a slice of processed wood that has been processed in the process. (A) Put the wood in an autoclave and
1.3 to 10 kg / cm ² of steam is introduced into the tube
Process for 10 to 200 minutes to color the wood
About. (B) After the above wood is colored and softened in step (A),
Or during the treatment in the step (A),
Applying a pressure of 1 to 10 kg / cm ^2, the compaction of the timber
Process. (C) 100-230 ° C in the autoclave
5 to 25 kg / cm ² of water vapor is introduced for 30 seconds to
Holding the wood for 120 minutes to fix the shape of the wood. Hereinafter, the present invention will be described. The wood used in the present invention has an air-dry specific gravity of 0.1.
Those which cannot be used for the surface of cosmetic materials because they are relatively light and have a soft surface of 35 or less can be used. Specific examples include mice, paulownia, cedar, carpoc, tetrameras, new guinea birthwood, segon lout, balsa, etc. But are not particularly limited to these tree species. The treatment is carried out using an autoclave, into which the above-mentioned wood is put, and after sealing, a pressure of 1.3 to 1 is applied.
0 kg / cm ² of steam was introduced into the autoclave,
By treating for 0 to 200 minutes, hemicellulo in wood-
Decomposes and colors the wood itself. The degree of coloring at this time differs from light brown to black brown depending on the properties, thickness, processing temperature, and processing time of the wood, but under the same conditions, extremely stable colored wood with a distinct shade can be obtained. The coloring is due to the change in the hemicellulose of the wood. If the water vapor pressure is below the lower limit, hydrolysis does not occur and coloring is not possible. In addition, when the amount exceeds the upper limit, lignin, cellulo-
Since some of the wood also begins to decompose, the treated wood becomes brittle and unusable. The same applies to the range of the processing time. After the coloring treatment, the wood is compressed at a compression ratio of 80 to 20%.
To improve the densification of the grain and the surface hardness, and hold the shape with steam at 100 to 230 ° C. and 5 to 25 kg / cm ² for 30 seconds to 120 minutes to fix the shape. To achieve a compression ratio of 80 to 20%, a pressure of 1 to 10 kg / cm ² may be applied. If the compression ratio is less than the lower limit, the grain density and sufficient surface hardness cannot be obtained. Not a good idea. In addition, the temperature is 100
If the temperature is less than 5 kg / cm ² , the shape of the compressed wood is not fixed sufficiently, and the temperature is 230 ° C. and 2 kg / cm 2.
If it exceeds 5 kg / cm ² , it becomes brittle and cannot be used. Thereafter, the steam in the autoclave is released to the atmosphere, and when the material temperature becomes 100 ° C. or less, it is sliced to a thickness of 0.1 to 2.0 mm with a normal slicer to form a veneer. And adhere to a plate-like substrate. In this case, as the plate-like base material, a wood-based base material such as a particle board, a plywood, an LVL, a medium density fiberboard, a solid wood, a laminated wood, and an inorganic base material such as a calcical board and a gypsum board can be used. Alternatively, a composite of these substrates can be applied. Further, the plate-shaped base material and the veneer are formed by ordinary means, for example, an aqueous vinyl urethane-based adhesive,
Laminate bonding may be performed using a vinyl acetate adhesive at a temperature of 80 to 120 ° C., for a time of 0.5 to 3 minutes, and at a pressure of 3 to 10 kg / cm ² . The obtained wood decorative material is colored from light brown to black brown as compared with the untreated one, has a remarkably improved surface hardness, and becomes a high-grade veneer with a fine grain, and is used for various purposes such as furniture and building materials. Becomes possible. By giving the wood the temperature and time at which only the easily hydrolyzed hemicellulose in the wood is decomposed,
An extremely stable coloring result can be obtained as a whole, and the wood decorative material has a clearer shade and deeper color than the original color. Regarding the compaction of wood, the medium temperature range (100
℃) or more, and a pressure condition of 1 to 10 kg / cm ² gives an appropriate specific gravity and an excellent surface hardness. Further, the temperature is raised to 100 to 230 ° C. (5
By treating with 水 蒸 気 25 kg / cm ² ) steam, the cells are reconstituted and the shape is fixed. In general, when wood is subjected to steam treatment, hemicellulose is decomposed and becomes extremely brittle, and the spatter as wood is lost and cannot be used as a veneer material. However, if compacted wood is used, it can be sliced sufficiently and has strength and spatter. It becomes. Hereinafter, examples and comparative examples will be shown and described in more detail. Example 1 Tungsten flitch having a thickness of 500 mm, a length of 2500 mm, a width of 250 mm and an air-drying specific gravity of 0.28 was placed in an autoclave under a steam pressure of 2.0 kg / cm ² and a time of 60 minutes. After the heating and coloring treatment, press 3 equipped with an autoclave.
It was consolidated to a compressibility of 70% at a pressure of kg / cm ² . Then, at 200 ° C., steam of 15 kg / cm ² was autoclaved.
After holding for 20 minutes, the steam of the autoclave was released to the atmosphere, and after 10 minutes, it was confirmed that the material temperature was below 100 ° C, and the press was released to fix the shape. The treated wood was taken out. Thereafter, the treated wood was sliced with a slicer to a thickness of 0.2 mm, and the air-dried specific gravity was 0.9.
No veneer was obtained. The veneer was placed on a plywood having a thickness of 4 mm with an aqueous vinyl urethane adhesive at a temperature of 10 mm.
Laminate bonding was carried out under the conditions of 0 ° C., a time of 1 minute, and a pressure of 5 kg / cm ² to obtain a wood decorative material of Example 1. The woody decorative material of Example 1 had clearer and lighter shades and deeper colors than the original color tone of the paulownia wood, and the grain was dense. Further, as a result of testing the surface hardness according to JIS5400, it was 3H. Example 2 Falkata flitch having a thickness of 300 mm, a length of 2500 mm, a width of 250 mm and an air-drying specific gravity of 0.33 was autoclaved.
After heating and coloring under the conditions of a steam pressure of 3.0 kg / cm ² and a time of 30 minutes in a press, the compaction was performed to a compressibility of 50% at a pressure of ² kg / cm ² by a press provided in an autoclave. did. Then, steam at 180 ° C. and 10 kg / cm ² was turned on.
After being introduced into the autoclave and holding for 30 minutes, the steam of the autoclave is released to the atmosphere, and after 10 minutes, the material temperature becomes 10 minutes.
After confirming that the temperature became 0 ° C. or lower, the press was released to take out the treated wood whose shape was fixed. Thereafter, the treated wood was sliced to a thickness of 0.5 mm with a slicer to obtain a veneer having an air-dried specific gravity of 1.06. Then, this veneer was laminated and bonded on a plywood under the same conditions as in Example 1 to obtain a woody decorative material of Example 2. The woody decorative material of Example 2 had clearer and lighter shades and deeper than the original color tone of Falkata, and had a fine grain. In addition, as a result of testing the surface hardness according to JIS5400, it was 2H. Comparative Example 1 Comparative Example 1 was processed in the same manner as in Example 1 except that the operations of heating coloring treatment, compaction, and fixing the shape were omitted.
However, the color tone was almost unshaded and the grain was coarse. In addition, as a result of testing the surface hardness according to JIS5400, it was 4B. Comparative Example 2 Comparative Example 2 was carried out in the same manner as in Example 1 except that the operations of heating coloring treatment, consolidation, and fixing the shape were omitted.
However, the color tone was almost unshaded and the grain was coarse. Further, as a result of testing the surface hardness according to JIS5400, it was 3B. Comparative Example 3 A paulownia flitch having a thickness of 500 mm, a length of 2500 mm, a width of 250 mm and an air-drying specific gravity of 0.28 was heated in an autoclave at a steam pressure of 2.0 kg / cm ² for 60 minutes. After the coloring treatment, the steam of the autoclave was opened to the atmosphere, and after 10 minutes, it was confirmed that the material temperature had become 100 ° C. or less, and the press was released to take out the treated wood. After a while
The treated wood was sliced to a thickness of 0.2 mm with a slicer to obtain a veneer having an air-drying specific gravity of 0.27. Then, the veneer was laminated and adhered on a plywood in the same manner as in Example 1 to obtain a decorative material of Comparative Example 3. The decorative material of Comparative Example 3 had a clearer shade than the original color tone of the paulownia wood, but the grain of wood was coarse as in Comparative Example 1. Further, as a result of testing the surface hardness according to JIS5400, it was 3B. Comparative Example 4 Falkata flitch having a thickness of 300 mm, a length of 2500 mm, a width of 250 mm and an air-dry specific gravity of 0.33 was autoclaved.
After heating and coloring under the conditions of a water vapor pressure of 3.0 kg / cm ² and a time of 30 minutes in a vacuum oven, the steam of the autoclave is released to the atmosphere, and 10 minutes later, the material temperature becomes 100 ° C. or less. After confirming that the press was released, the treated wood was taken out. Thereafter, the treated wood was sliced to a thickness of 0.5 mm with a slicer to obtain a veneer having an air-drying specific gravity of 0.32. Then, this veneer was laminated and adhered on a plywood under the same conditions as in Example 1 to obtain a decorative material of Comparative Example 4. The decorative material of Comparative Example 4 had a clearer shade than the original color tone of Falkata, but the fineness of the grain was as coarse as the decorative material of Comparative Example 2. Further, the surface hardness was tested according to JIS 5400, and as a result, it was 2B. Comparative Example 5 A paulownia flitch having a thickness of 500 mm, a length of 2500 mm, a width of 250 mm and an air-drying specific gravity of 0.28 was heated in an autoclave at a steam pressure of 2.0 kg / cm ² for 60 minutes. After the coloring treatment, the compact was compacted to a compressibility of 10% at a pressure of 0.5 kg / cm ² by a press provided in an autoclave. Then, steam at 180 ° C. and 10 kg / cm ² was turned on.
After being introduced into the autoclave and holding for 30 minutes, the steam of the autoclave is released to the atmosphere, and after 10 minutes, the material temperature becomes 10 minutes.
After confirming that the temperature became 0 ° C. or less, the press was released and the treated wood was taken out. Thereafter, the treated wood was sliced to a thickness of 0.5 mm with a slicer to obtain a veneer having an air-drying specific gravity of 0.30. Then, this veneer was laminated and adhered on a plywood under the same conditions as in Example 1 to obtain a decorative material of Comparative Example 5. Comparative Example 5
The decorative material of Example 2 had a clearer shade than the original color tone of the paulownia wood, but the fineness of the grain was as coarse as the decorative material of Comparative Example 2. Also, as a result of testing the surface hardness according to JIS5400,
2B. Comparative Example 6 In Example 2, the compressibility was 3% at a pressure of 0.2 kg / cm ^2.
Processing was performed in the same manner as in Example 2 except that the compacting was performed to obtain a decorative material of Comparative Example 6. Although the decorative material of Comparative Example 6 was clearer and darker than the original color tone of Falkata, the fineness of the grain was coarse as in Comparative Example 2. Further, the surface hardness is set to JIS540
As a result of testing according to 0, it was 2B. Table 1 shows the evaluation results. [Table 1] Since the wood decorative material obtained by the present invention has a veneer which is made by heating and coloring wood, it has clearer shades and higher quality than the one using dyes and pigments, giving a three-dimensional effect. Be rich. Further, since the wood is compacted and fixed in shape, the grain becomes denser than the original one, and the surface hardness is harder than the original one, which is industrially useful. Further, by changing the heat treatment conditions, the same kind of material can be expressed in a light color to a dark color, and a large-scale apparatus and an inert gas are not required for the production, and the disposal of the treatment agent is not required. The problem can be solved. In addition, it is possible to effectively use paulownia, falkata and the like which cannot be used for the surface of the decorative material due to the relatively light air-dry specific gravity of 0.35 or less and the soft surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural sectional view of a wooden decorative material obtained by the present invention. [Explanation of Signs] 1 Plate-like base material 2 Adhesive layer 3 Veneer plate 5 Wood decorative material

Continuation of the front page (56) References JP-A-61-61803 (JP, A) JP-A-49-1703 (JP, A) JP-A-59-165605 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27D 5/00 B27M 1/00-3/38 B27K 5/00-5/06

Claims (1)

(57) [Claims 1] A method for producing a wooden decorative material in which a veneer is laminated and adhered to at least one surface of a plate-like base material, wherein the veneer comprises the following:
Sliding the treated wood treated in the steps (A) to (C)
A method for producing a wood-based decorative material, characterized in that the material is smooth. (A) Put the wood in an autoclave and
1.3 to 10 kg / cm ² of steam is introduced into the tube
Process for 10 to 200 minutes to color the wood
About. (B) After the above wood is colored and softened in step (A),
Or during the treatment in the step (A),
Applying a pressure of 1 to 10 kg / cm ^2, the compaction of the timber
Process. (C) 100-230 ° C in the autoclave
5 to 25 kg / cm ² of water vapor is introduced for 30 seconds to
Holding the wood for 120 minutes to fix the shape of the wood.