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Manufacturing method of high-density wood-laminated lumber

A manufacturing method and wood layer technology, applied in the direction of manufacturing tools, wood treatment, wood treatment details, etc., can solve the problems of reduced quality of plywood, inability to obtain strength, difficulty in purchasing high-quality veneer at low prices, etc., and achieve the effect of efficient production

Active Publication Date: 2020-01-14
DAIKEN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, Nanyang wood made of hardwoods such as Apitong and Keruing is gradually decreasing, so it is becoming more and more difficult to buy high-quality veneers at low prices
Therefore, the degradation of the quality of plywood made from these Nanyang woods becomes a big problem
Although wood fiber boards such as OSB (Oriented Strand Board) are gradually used to replace plywood, OSB with ordinary density cannot obtain sufficient strength

Method used

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  • Manufacturing method of high-density wood-laminated lumber
  • Manufacturing method of high-density wood-laminated lumber
  • Manufacturing method of high-density wood-laminated lumber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Rolling treatment is carried out as a pretreatment process on flakes made of cypress trees. The length of the flakes along the grain direction is 150-200mm, the width is 15-25mm, the thickness is 0.8-2mm, and the density is 300-450kg / m 3 . The pressing conditions of the rolling treatment are as follows: the temperature is 250° C., the gap between the hot pressing rolls is 0.5 mm, the discharge speed is 1.5 m / min, and the compression rate is 40%. The aggregates of the rolled flakes were laminated to form a 37 mm thick laminated mat consisting of five flake layers. Then, with a pressing temperature of 140°C and a pressure of 4N / mm 2 Carry out hot pressing for 10 minutes to obtain a density of 818kg / m 3 , Particleboard with a thickness of 12.4mm. The above is taken as Embodiment 1.

[0079] Figure 4 The results of a bending test, a dimensional change test, and a water absorption test performed on this Example 1 are shown. and, Figure 5 The results of measuring the...

Embodiment 2

[0081] Carry out rolling treatment as a pretreatment process on the shavings made of Douglas fir, wherein the length of the shavings along the grain direction is 150-200mm, the width is 15-25mm, the thickness is 0.8-2mm, and the density is 350-450kg / m 3 . The pressing conditions are the same as in Example 1. An aggregate of several flakes subjected to the rolling treatment was laminated to form a 36-mm-thick laminated mat composed of five flake layers. After that, with a pressing temperature of 140°C and a pressure of 4N / mm 2 Carry out hot pressing for 10 minutes to obtain a density of 832kg / m 3 , The particleboard of thickness 12.2mm, as embodiment two with this. Figure 4 The results of the bending test, dimensional change test and water absorption test of Example 2 are shown.

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Abstract

This method for manufacturing a high-density strand board enables high-density strand boards to be formed by using about the same press pressure as press pressures required to form strand boards with common densities, so that the high-density strand boards can be produced without using special facilities and equipment. A pretreatment process P2 is performed on strands 5 before pressing. The pretreatment process P2 is comprised of a first treatment process P2a and a subsequent second treatment process P2b. At least one of beating, high-frequency treatment, high-temperature high-pressure treatment, high-water pressure treatment, repeated deaeration and dehydration treatment, and chemical treatment is performed in the first treatment process P2a, and roll pressing or flat press pressing is performed in the second treatment process P2b. A strand board B with a density of 750 to 950 kg / mis formed by using a press pressure of 4 N / mmor less.

Description

technical field [0001] The invention relates to a method for manufacturing high-density wood laminated timber. Background technique [0002] At present, the number of Nanyang wood made of broad-leaved trees such as Apitong and Keruing is gradually decreasing, so it is becoming more and more difficult to buy high-quality veneers at low prices. Therefore, the deterioration of the quality of the plywood made from these southern woods becomes a big problem. Although wood fiber boards such as OSB (Oriented Strand Board) are gradually being used in place of plywood, OSB having an ordinary density cannot obtain sufficient strength. [0003] Thus, in the prior art, for example, Patent Document 1 discloses a large-scale OSB board with a maximum capacity of 700kg / m 3 Density, length of at least 7m, flexural modulus of elasticity in the main load direction of at least 7000N / mm 2 . [0004] prior art literature [0005] patent documents [0006] Patent Document 1: Japanese Patent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/00B27K5/00B27N1/00B30B9/00B30B9/28
CPCB27N1/00B27N3/02B27N3/143B27N3/18B27N3/24B27D5/00B27K5/00B27M1/08B30B9/00B30B9/28B27N3/04
Inventor 大岛克仁杉尾康志长冈浩仁坂本一辉
Owner DAIKEN CORP