JP2013216049A - Woody board and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the wood texture by urging the use of sawn timber (end material) in a wood board using a wood cutting board and solving a problem of color difference due to a part of wood.
SOLUTION: A wood board in which a plurality of wood chip plates are bonded and laminated and formed into a plate shape, and at least a thermo-colored wood chip plate is bonded and stacked on the surface layer portion thereof. .
[Selection figure] None

Description

  The present invention relates to a wooden board and a manufacturing method thereof.

  Wood is widely used as a material for housing equipment including interior materials such as floors, walls, and ceilings, and doors, construction, storage, and other fittings. However, although wood having a high-grade appearance is expensive, approximately 70 to 80% is discarded when sawing from raw wood.

  In order to eliminate such problems of economic efficiency and defects due to the existence of knots, etc. inherent to wood, subdivided waste materials from lumber, thinned wood or small diameter wood, etc., and adhesives etc. Particle boards, medium density fiberboards (MDF), etc. that have been integrated in the past have been developed.

  However, in the case of these reconstructed materials, it is difficult to obtain a wood texture, and strip portions having extremely different physical properties are mixed, and there is a sense of incongruity in painting, particularly, base color painting. For this reason, after all, it is difficult to obtain a high-quality appearance.

  Moreover, there exists a problem that strength performance is low and it is not necessarily suitable as a structural member.

  On the other hand, for example, a wood board in which a wood chip board obtained by slicing wood with a wafer riser or a flaker is bonded to form a multilayer is known. For example, it is an oriented strand board, a wafer board, a flake board, etc. (for example, patent documents 1-3).

Japanese Patent Laid-Open No. 10-329113 JP 2000-71216 A JP 2001-293705 A

  However, even with these wood boards, which are relatively good in terms of performance such as wood texture and strength, it is not easy to reduce the discoloration of the wood chips due to the wood parts by painting, etc. Actually, it is difficult to make the material uniform while maintaining the wood texture.

  For this reason, it has been desired to improve the log yield due to the effective use of sawmill waste.

  As described above, the present invention promotes the use of lumber waste (end material) to improve the wood yield in the wood board by bonding and laminating wood chips, and the color with a sense of incongruity due to the wood part. The problem is to solve the difference problem and to improve the wood texture.

  In order to solve the above-mentioned problems, the wood board of the present invention is a wood board formed by laminating a plurality of wood chipboards by bonding and laminating, and at least the surface layer portion is thermally colored. It is characterized in that the wood chip plates are bonded and laminated.

  In the above-mentioned wood board, it is also considered that wood chip plates having different coloring degrees of thermal coloring are bonded and laminated, and that wood chip plates of different species are bonded and laminated.

  In the wood board, the wood chipboard is preferably at least one of oak, beech, birch and cypress.

  Moreover, it is preferable that the light-transmitting coating or sheet bonding is applied to the surface of the wooden board.

  The wood board manufacturing method of the present invention is a wood board manufacturing method in which a plurality of wood chip plates are bonded and laminated to form a plate, and at least the surface layer portion is heated by heating with high-pressure steam. It is characterized by adhering and laminating colored wood chipboards.

  In the manufacturing method described above, it is also considered to bond and laminate wood chip pieces having different degrees of thermal coloring treatment.

  It is also considered to bond and laminate wood chips from different species.

  In the wood board manufacturing method described above, it is preferable that the wood chipboard is at least one of oak, beech, birch and cypress tree species.

  Further, in the wood board manufacturing method, it is preferable to apply light transmissive coating or sheet bonding to the surface.

  According to the woody board of the present invention, the problem of color difference that causes a sense of incongruity due to the part of wood is solved, and the wood texture that leaves the texture of wood is good. And the use of the sawn timber (endwood) is promoted, and the yield of raw wood is improved.

  As described above, the wood board of the present invention is formed by laminating and laminating a plurality of wood chip plates. Here, as the wood cut piece board, a piece of waste wood (endwood), thinned wood, small-diameter wood, etc., produced at the time of sawing is made into a thin piece shape by a known means such as cutting, cutting, splitting or the like.

  For example, it may be prepared by a slicer such as a wafer riser or a flaker. More preferably, it is a strand in which waste material (end material) is used, and this strand is used by being oriented in a predetermined direction.

  In the wood board of the present invention, the raw wood for forming the wood chipboard may be selected from various tree species.

  Examples include oak, beech, hippopotamus, cypress, sawara, hiba, kayak, paulownia, pine, cedar, oak, fir, zelkova and the like. Examples of overseas materials include rice pine, rice cedar, rice hiba, rice fir, spruce, waran, meranti, Junkong, chamelele, karampayan, teak, balsa, mahogany, and cedro.

  Of these, wood chips from wood species such as oak, beech (beach), hippo (birch), and cypress that are conventionally used as surface materials in interior materials, furniture, etc. are preferred. Take as an example.

  The size and thickness of the wood chipboard can be appropriately determined in consideration of the forming method, the required dimensions and use of the wood board, the form of adhesive lamination processing, and the like.

  For example, in strand processing by a slicer for an oriented strand board, a width of 5 mm to 40 mm, a length of 10 mm to 80 mm, and a thickness of 0.1 mm to 0.5 mm are exemplified.

  The wood board of the present invention is formed by laminating and laminating a plurality of these wood chip plates, and at least the surface layer portion is bonded and laminated with a heat-colored wood chip plate. ing. The thermal coloring here is performed by heating with high-pressure steam.

  There are various methods of heating with high-pressure steam for the thermal coloring. For example, a steam supply hole is provided in a sealed container or a compression plate or side plate of a sealed mold, and steam is supplied to the wood chip board from the outside through the steam supply hole, or moisture contained by heating the wood chip board There is a method of evaporating the water.

  In general, the heating with high-pressure steam can be performed under the conditions of, for example, 120 ° C. to 200 ° C., 0.3 MP to 0.8 MPa, and 10 to 30 minutes in a pressure vessel.

  Humidity, pressure, moisture conditions, etc. can be set in consideration of the tree species, size, thickness, moisture content, required coloring (dark color) degree, etc. of the wood chipboard.

  If the wood is cut into thin pieces to form a wood chip, there is no risk of cracking even with high-pressure and high-temperature steam treatment, and high-temperature treatment (dark color treatment) is possible. A uniformly machined wood chip board is obtained.

  In the wood board of the present invention, the above-mentioned heat-colored wood chip pieces are disposed and bonded and laminated on at least the surface layer portion of the wood board pieces.

  In this case, the heat-colored wood chip is disposed only on the surface layer portion of the wood board, and may be multilayer-formed with the wood chip not heat-colored, or may be all heat-colored wood chips. The plate may be multilayer molded.

  A board with a wood texture that retains the texture of wood is realized. Conventionally, it is difficult even with painting, in particular, coloring with a base material, and the problem of color difference due to an uncomfortable wood part is solved in the wood board of the present invention.

  In the thermal coloring process by heating with the high-pressure steam described above, adjustments such as lowering the color density are possible by adjusting the processing conditions, for example, the processing temperature.

  Therefore, the appearance of a unique new texture can be expressed by mixing and stacking wood chipboards with different degrees of processing, that is, with different levels of color intensity.

  Moreover, you may use the heat-colored wood chip board of a different tree type. Brings a new effect on appearance.

  In the adhesive lamination for forming a wooden board, various adhesives may be selected and used in consideration of affinity with tree species, strength, and the like. Examples thereof include phenol-based, resorcinol-based, urea-based, melamine, maleic acid-based, and isocyanate-based adhesives.

  The plate-shaped molding by the adhesive layer can be performed as heat and pressure molding. Known methods and devices may be used. Examples thereof include a hot plate press, a batch type or a continuous press molding method by heating such as microwaves and high frequency dielectrics.

  The molding conditions may be set in consideration of the wood species and properties of the wood chipboard, the thickness of the wood board, the type of adhesive, the required adhesion performance, and the like. For example, adhesion lamination molding of a 5 mm to 15 mm thick wood board by hot plate pressing at 160 ° C. to 220 ° C., 0.2 MPa to 0.8 MPa, 2 minutes to 15 minutes is exemplified.

  After the adhesive lamination molding, post-processing such as polishing or cutting of the surface of the wooden board may be appropriately performed. According to such post-processing, it is expected that the boundary shape of the wood chip piece naturally varies and the appearance is improved.

  The wood board surface may be painted. In particular, it is considered to apply a light-transmitting coating. Or you may adhere | attach the sheet | seat made from resin of light transmittance etc. on the surface.

  By applying such light-transmitting coating or sheet bonding, it is expected to prevent surface damage, improve water resistance, and improve the wood texture.

  The wood board of the present invention may be used as a member such as an interior material or furniture after being adjusted to a predetermined size as it is, or on the surface of a base material made of a surface constituent material such as wood, particle board, or MDF. You may stick and use.

Examples of the present invention and comparative examples will be described below.
(Example)
Under the following conditions, a wood board was manufactured using a strand as a wood chipboard.

Strand: Raw material Nara flitch is processed into a strand using a slicer.
Set Thickness 0.25mm Width 15mm Length 45mm
High-temperature high-pressure steam treatment: saturated steam treatment in a pressure vessel maintained at 160 ° C. (0.52 MPa) for 20 minutes

Adhesive: Spray application of the following adhesive to the strand at a mass ratio of 11% Melamine adhesive (Oshika Corporation M-310 100, ammonium sulfate 3)
Hot press: Board surface temperature 200 ° C 0.5 MPa Holding 5 minutes Plate making to 9 mm thickness Finish: Thunder finish # 240

(Comparative Example 1)
The high temperature and high pressure steam treatment in the above embodiment is omitted. Others are the same as Example 1.

(Comparative Example 2)
The strand in the above example is replaced with crushed wood. Others are the same as Example 1. The crushed wood used a ring flaker, and the shape of the wood element was close to a needle shape having a thickness of 0.7 to 2.8 mm, a width of 2 to 5.5 mm, and a length of 9 to 38 mm.

(Evaluation)
About the wood board obtained by the above Example and Comparative Examples 1 and 2, wood texture (visual observation), variation (uniformity of color tone, nonuniformity), and yield (rawwood yield) were evaluated. A comprehensive evaluation was also conducted. The results are shown in Table 1.
The symbol “X” in the table indicates the following.

<Wood texture>
○: The texture as wood remains, and the wood texture is good.

<Dispersion>
○: Less than ΔE2 ×: ΔE2 or more

<Yield>
○: 90% or more

<Comprehensive evaluation>
○: Even when using sawn timber (endwood), uncomfortable color differences due to the wood parts are reduced, and the log yield is good. The value is high as a wood board using wood chipboard.
X: Other than the above, the value is low as a wood board using a wood chipboard.

Claims (8)

  A wood board in which a plurality of wood chipboards are bonded and laminated to form a plate, and at least the surface layer portion of the woodcut board is bonded and laminated with heat coloring board.   The wood board according to claim 1, wherein wood chip plates having different coloring degrees of thermal coloring are bonded and laminated.   The wood board according to claim 1 or 2, wherein the wood chipboard is at least one of oak, beech, birch and cypress tree species.   The wooden board according to any one of claims 1 to 3, wherein a light-transmitting paint or sheet adhesion is applied to the surface.   A method of manufacturing a wood board in which a plurality of wood chip plates are bonded and laminated to form a plate, and at least the surface layer part is bonded and laminated with a wood chip plate heat-colored by heating with high-pressure steam. A method for producing a wooden board characterized by the above.   6. The method for producing a wood board according to claim 5, wherein wood chip plates having different degrees of thermal coloring treatment are bonded and laminated.   The method for producing a woody board according to claim 5 or 6, wherein the wood chipboard is at least one of oak, beech, birch and cypress tree species. The method for producing a wooden board according to any one of claims 5 to 7, wherein a light-transmitting coating or sheet bonding is applied to the surface.