JPH01310902A - Panel material in continuous form - Google Patents

Abstract

PURPOSE:To make the perpendicular working of veneers with parallel fiber directions unnecessary and at the same time prevent cracks in a sliced veneer from developing by a method wherein at least two cross band veneers are respectively arranged in the second or third ply from the front and rear plys and the total thickness of the cross band veneers are set to be the specified value and further fingers are produced at the upper and lower parts in a laminated panel material in continuous form. CONSTITUTION:At least two cross band veneers 2 are respectively arranged in the second or third ply from the front and rear plys and the total thickness of the cross band veneers are set to be not less than 10% and not more than 20%. A veneer 1, which is at the front surface side from the cross band veneer and has all longitudinal directions, is made to be slightly thicker than the veneer 1, which is used in plys within the cross band veneers 2 and has all longitudinal fiber directions, and below 20% of the total thickness of a panel material. Further, a finger joint is formed so as to produce butt joints respectively at the upper and lower parts of the panel material in continuous form 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a long board material, and more particularly to a long board material in which veneers are laminated via an adhesive and finger jointed.

[Conventional technology]

For long boards made by laminating veneers with adhesive and finger-jointing them, for example, a veneer whose fiber direction is parallel to the finger processing direction is processed perpendicularly, and a veneer whose fiber direction is perpendicular to the direction of finger processing. As for the veneer, a plywood in which male and female plywood processed to form an inclined surface are joined with adhesive is known (Japanese Patent Publication No. 58-50561).
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[Problem to be solved by the invention]

The above-mentioned plywood has a high strength joint between the plywood and good workability, but there is a problem that it is difficult to process a veneer whose fiber direction is parallel to the finger processing direction perpendicularly. . This is due to reasons such as the surface may be sanded down with a sander to adjust the thickness before finger processing, the thickness of the veneer varies, and there are problems with the accuracy of the processing machine itself.

The object of the present invention is to provide a long plate material that does not have the above-mentioned problems, and furthermore, to provide a long plate material that does not cause cracking of the veneer when a veneer is pasted on the surface of the plate material.

[Means for Solving the Problems] The above object is to provide a long board material in which the present invention is a long board material in which veneers are laminated with an adhesive and finger jointed, in which the fiber direction is all in the longitudinal direction; At least two of the veneers to be cross-banded should be on the second or third layer from the front and back layers of the board, and the total thickness of the veneers to be cross-banded should be the same as the board material. This is achieved by a long plate material having a thickness of 10% or more and 20% or less of the thickness of the plate material, and having fingers formed at the top and bottom of the plate material to serve as butt joints.

The present invention will be explained in detail below.

In the present invention, a veneer with all fiber directions in the longitudinal direction and a cross-band veneer (veneer pasted with the fiber direction perpendicular to each other, hereinafter referred to as a cross-band veneer) are used. . Then, in the cutting board material, which is made by laminating these veneers with adhesive and finger-jointing them,
At least two of the veneers for the crossband should be on the second or third layer from the front and back layers of the board, and the total thickness of the veneers for the crossband should be at least 10% of the thickness of the board. 20% or less. By selecting the number and/or thickness of the two veneers under this condition, the thickness of the long plate material can be made thicker or thinner. For example, in the embodiment described later, the thickness of the long plate material is 20M, but it can be made thicker or thinner than this. Furthermore, fingers are formed at the top and bottom of the plate to serve as butt joints. In addition, it is preferable that 50% or more of the thickness of the cross band layer be a butt joint for the strength of the long plate material in the longitudinal direction.

Next, the main part of the present invention is to use a veneer whose fibers are all in the longitudinal direction.

By the way, in general, plate materials (LVL) that are laminated so that all the fiber directions are in the longitudinal direction have the disadvantage that cracks tend to occur on the surface in the fiber direction, and thin veneers (0,2~
This is especially a problem if you paste something like 1 son rank).

Therefore, a veneer was pasted on, called a cross band, with the fibers oriented at right angles. However, when attaching a veneer to the surface of a finger-jointed board as in the present invention, it is necessary to bring the cross band to the surface of the LVL. If you bring it to the third page, the surface will look better, and the sides will be less likely to get scratched or chipped.

The second or third cross band veneer in which all the fibers on the surface side are in the longitudinal direction is better than the veneer used inside where the fiber direction is in the longitudinal direction. Make it slightly thinner so that it does not exceed 20% of the total thickness. Normally, the thickness of this veneer is 1.5 rtII! 1
The following is preferable. If it gets thicker than this, you can sand it.

Note that if the total thickness of the crossband veneers is less than 10%, the effect will be small, and if it exceeds 20%, some of the fingers will become weak. Furthermore, in the present invention, the reason why the upper and lower parts of the plate material are made into butt joints is to prevent the tip from chipping.

〔Example〕

Eight 2.2 mm thick lauan veneers with all fiber directions in the longitudinal direction and three 1.2 mm thick lauan veneers for the cross band were laminated with adhesive, and the surface was polished to produce a 20 mra thick N plate as shown in Figure 1 (
Two pieces with a length of 2m50c+n were manufactured.

As shown in Figure 1, these two parts were finger-processed and bonded together using an adhesive to create a length of 4m50cm as shown in Figure 1.
m0 long board material (stair side board material) was manufactured.

In Figure 1, 1 is a lauan veneer whose fiber direction is all in the longitudinal direction, 2 is a lauan veneer for cross bands,
3 is a long plate material.

As shown in Fig. 1, the lauan veneer 2 for the cross band is present at the second layer and the center from the front and back layers, respectively, and fingers are formed at the top and bottom of the long board 3 to form butt joints. are doing.

A veneer (oak veneer) 4 with a thickness of 0.3 mm was adhered to the longitudinal surface and side surface of the long board material 3, and a colored amino alkyd transparent paint was applied to the surface with a cloth of 100 g/m"Wli.
It was dried at ℃ for 40 minutes to obtain a stair side panel.

〔Effect of the invention〕

The long board material of the present invention can be made without the need for vertical processing of a veneer in which the fiber direction of the veneer is parallel to the finger processing direction, and when a veneer is pasted on the surface of the board material, cracks in the veneer can be avoided. It is an excellent long plate material that does not cause any generation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a long plate material according to an embodiment of the present invention, and FIG. 2 is a slope view of a stair side plate according to an embodiment. ■... Lauan veneer with all fiber directions in the longitudinal direction, 2... Lauan veneer for cross band, 3...
Long board material, 4... veneer.

Claims (1)

[Claims] A long board material in which veneers are laminated with an adhesive and finger-jointed, consisting of a veneer in which all fiber directions are in the longitudinal direction and a veneer in which the fibers are cross-banded, and at least two of the veneers in which the fibers are cross-banded. be the second or third layer from the front and back layers of the board, respectively, and the total thickness of the veneers to be cross-banded should be between 10% and 20% of the thickness of the board, and the top and bottom of the board should be batted. A long plate material characterized by having fingers formed to serve as joints.