Manufacturing method of I-shaped wood laminated veneer lumber (LVL)

Abstract

The invention provides a manufacturing method of an I-shaped wood laminated veneer lumber (LVL). The manufacturing method comprises the following steps: adjusting the water content of wood veneers to be 5-15%; coating a phenolic resin adhesive or urea-formaldehyde (UF) resin adhesive on the surfaces of the wood veneers, laminating and assembling the wood veneers in parallel along the grain, cold pressing to obtain a core strip board blank, and sawing the board blank into core strips with the width of 10-45cm; coating a phenolic resin adhesive on the surface of complete sheet veneers at even-numbered layers; assembling the veneers in parallel along the grain to obtain a face veneer of the LVL, and vertically placing the core strips on the face veneer to be taken as a core layer of the LVL; and hot-pressing the assembled board blank at the temperature of 150-180 DEG C and the pressure of 1.2-1.4 MPa for 15-35s / mm to finally obtain the I-shaped LVL. In the manufacturing method, anisotropy of wood is fully utilized so as to greatly improve the strength of the fast-growing wood LVL without increasing a reinforcing material, and the obtained product meets the requirements of the structural LVL standard in China. Therefore, the manufacturing method provided by the invention has the advantages of high utilization ratio of raw materials, short production cycle and low production energy consumption.

Description

technical field [0001] The invention relates to a method for manufacturing an I-shaped wooden veneer laminate, belonging to the technical field of wood-based panel manufacturing. Background technique [0002] With the reduction of forest resources in the world, large-diameter logs are increasingly in short supply. my country is a country lacking in forest resources, the forest coverage rate is only 18.21%, and the per capita forest stock volume is 9.42m 3 , is 1 / 8 of the world's average level, and is one of the lowest countries in the world. After the catastrophic flood in China in 1998, the government decided to ban the logging of natural forests in key state-owned forest areas such as the middle and upper reaches of the Yangtze River and the Yellow River, and reduced the country's timber production year by year. However, with the accelerated pace of China's housing and infrastructure construction, the demand for wood continues to rise. According to statistics, my countr...

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Problems solved by technology

[0004] What the present invention proposes is a kind of manufacturing method of I-shaped wooden laminated veneer lumber, and its purpose is to utilize the anisotropy of wood (that is, the strength of wood along the grain direction is far greater than that of the transverse grain direction) for the defect that artificial fast-growing forest wood exists. Strength), without additional reinforcement materials, the manufacturing performance meets the requirements of my country's structural laminated veneer lumber I-shaped wood-based laminated veneer lumber, which can be used in housing construction and heavy-duty electromechanical packaging and other fields

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