JP2005335143A - Method for manufacturing architectural board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a woody fiber board 3 presentable by eliminating an unevenness from the upper surface of the board 3. <P>SOLUTION: In this manufacturing method, a base 2 made of a woody material is prepared and is a plywood constituted of five conifer veneers. In addition, a lower surface layer part is ground and an upper surface layer part is not ground. The woody fiber board 3 is pressure-laminated on the upper surface of the base 2 through a known adhesive in such a way that the surface layer part on the woody fiber board 3 faces upward. After that, the surface layer part on the upper surface of the woody fiber board 3 is ground to the depth of, for example, about 0.25 mm so that a rigid layer inside the woody fiber board 3 is exposed to the upper surface (a face). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a building board.

Conventionally, the following manufacturing methods are known.
It is known to have a step of attaching a wood fiber board in which both upper and lower surface layer portions are ground to expose a hard layer inside the surface layer portion on the upper surface of a substrate made of a wood material.
As is well known, wood fiberboards [Middle fiberboard (MDF), hard fiberboard, etc.] that have been molded by the dry method, in which the upper and lower surface layers are not ground, are placed inside the upper and lower surface layers. It has a hard layer with a high specific gravity compared to the part. When the hard layer is heated / compressed by a pair of pressure plates, moisture evaporation of the portion contacting the pressure plate (surface layer portion) and curing of the binder are performed instantaneously, but the inner portion of the surface layer portion ( The portion that becomes the hard layer) is considered to occur due to reasons such as water evaporation and binder curing being performed behind the surface layer portion. As described above, in the conventional manufacturing, the wood fiber board in which the upper and lower surface layer portions are ground and the hard layer inside the surface layer portion is exposed is used. In this specification, the wood-based material includes peeled wood, plywood and the like.
JP-A-10-34,603

The conventional manufacturing method has the following drawbacks.
If there is unevenness (hereinafter referred to as “upper surface unevenness”) on the upper surface of the substrate made of a wood-based material due to a dense portion or the like that forms nodes and annual rings, the upper surface unevenness will be The lower surface (sticking surface) of the wood fiber board is deformed along with the deformation, and the upper surface of the wood fiber board is also deformed and becomes uneven with the deformation, and the appearance is poor.

The present invention employs the following means in order to eliminate the above disadvantages.
(1) The invention of claim 1 includes a step of attaching a wooden fiberboard whose upper surface layer portion is not ground to the upper surface of a substrate made of a wood-based material, and grinding the surface layer portion on the wooden fiberboard. And a step of exposing a hard layer having a higher specific gravity than the other part inside the surface layer part to the upper surface.
(2) The invention according to claim 2 is the invention according to claim 1, wherein the substrate is a plywood made of at least three softwood veneers.

The present invention has the following effects by the configuration as described above.
(1) According to the first aspect of the present invention, the upper surface of the wood fiber board is ground after the wood fiber board is attached to the substrate, that is, after irregularities appear on the upper surface of the wood fiber board. It is possible to flatten the upper surface of the wood fiber board by shaving the unevenness of the upper surface of the wood fiber board, and as a result, it is possible to obtain a building board having a good appearance. Moreover, since the hard layer appears on the upper surface, the hardness of the upper surface of the building board can be increased.
(2) According to invention of Claim 2, since a board | substrate is a plywood which consists of an inexpensive softwood single board, an inexpensive board for construction can be obtained.

  Embodiments of the present invention will be described below.

[First step]
A substrate 2 made of a wood material is prepared. The said board | substrate 2 is a plywood which consists of a softwood veneer at least 3 sheets in this Embodiment. The thickness of the substrate 2 is about 9 mm, and the planar shape is a shape corresponding to the product.
Moreover, the lower surface layer part is ground, On the other hand, the wood fiber board 3 which does not grind the upper surface layer part is prepared. That is, the wood fiber board 3 has a lower hard layer exposed, and has an upper surface layer portion and an inner hard layer. The thickness of the wood fiber board 3 is about 3 mm, and the planar shape is the same as that of the substrate 2.

[Second step]
Then, the wood fiber board 3 is affixed on the upper surface of the substrate 2 while applying pressure through a known adhesive with the upper surface portion facing upward.

[Third step]
Thereafter, the surface layer portion on the upper surface of the wood fiber board 3 is ground, for example, by about 0.25 mm, and the hard layer inside the wood fiber board 3 is exposed on the upper surface (surface).

A description will be given below of modifications and the like.
(1) After the third step, a decorative sheet such as a veneer may be attached to the upper surface of the wood fiber board 3.
(2) In the second step, a wood fiber board whose upper and lower surface layers are not ground may be applied to the upper surface of the substrate while being pressed.

It is a longitudinal cross-sectional view of the intermediate product for demonstrating the 2nd process of embodiment method of this invention.

Explanation of symbols

2 Substrate 3 Wood fiberboard

Claims (2)

  A process of attaching a wooden fiberboard whose upper surface layer portion is not ground at least on the upper surface of a substrate made of a wood-based material, and grinding the surface layer portion on the wooden fiberboard, inside the surface layer portion, And a step of exposing the upper surface of a hard layer having a higher specific gravity than other parts. The method for manufacturing a building board according to claim 1, wherein the substrate is a plywood made of at least three softwood veneers.

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