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

A technology of laminated veneer lumber and a manufacturing method, which is applied to the joining of wooden veneers, manufacturing tools, wood processing utensils, etc., to achieve the effects of small hot pressing pressure, shortening hot pressing time and improving strength

Active Publication Date: 2012-03-14
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-gro

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The moisture content of the fast-growing poplar veneer is adjusted to 5% after drying. Apply phenolic resin glue on the surface of the veneer, and the amount of glue on one side is 150g / m 2 . The glued veneers are laminated parallel to the direction of the grain to form a blank, and the core strip slab is obtained after cold pressing. The cold pressing pressure is controlled at 1.0 MPa and the time is 10 minutes. Then, the slab was sawed into core strips with a width of 10 mm. The surface is made of a whole veneer with a thickness of 3mm, coated with phenolic resin glue, and the amount of glue applied is 150g / m 2 . Then the billet is assembled, and the upper and lower surfaces are respectively laminated with 2 layers of 3mm thick veneers parallel to the direction of the grain, and the core strips are vertically laminated along the direction of the grain. Put the assembled slabs into a hot press machine for hot pressing. The hot pressing temperature is 150° C., the h...

Embodiment 2

[0018] The moisture content of the fast-growing poplar veneer is adjusted to 10% after drying. Apply phenolic resin glue on the surface of the veneer, and the amount of glue on one side is 190g / m 2 . The glued veneers are stacked parallel to the direction of the grain to form a blank, and the core strip slab is obtained after cold pressing. The cold pressing pressure is controlled at 1.1 MPa and the time is 20 minutes. Then, the slab was sawed into core strips with a width of 20 mm. The surface is made of a whole veneer with a thickness of 4mm, coated with phenolic resin glue, and the amount of glue applied is 190g / m 2 . Then the billet is assembled, and the upper and lower surfaces are respectively laminated with 2 layers of 4mm thick veneers in parallel with the direction of the grain, and the core strips are vertically laminated with the direction of the grain. Put the assembled slabs into a hot-pressing machine for hot-pressing. The hot-pressing temperature is 160° C.,...

Embodiment 3

[0020] The moisture content of the fast-growing poplar veneer is adjusted to 15% after drying. Apply phenolic resin glue on the surface of the veneer, and the amount of glue on one side is 230g / m 2 . The glued veneers are stacked parallel to the direction of the grain to form a blank, and the core strip slab is obtained after cold pressing. The cold pressing pressure is controlled at 1.2 MPa and the time is 30 minutes. The slab was then sawn into core strips with a width of 45 mm. The surface is made of a whole veneer with a thickness of 5mm, coated with phenolic resin glue, and the amount of glue applied is 230g / m 2 . Then the billet is assembled, and the upper and lower surfaces are respectively laminated with 2 layers of 5mm thick veneers in parallel with the direction of the grain, and the core strips are vertically laminated with the direction of the grain. Put the assembled slabs into a hot press machine for hot pressing. The hot pressing temperature is 180° C., the ...

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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...

Claims

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Application Information

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IPC IPC(8): B27D1/00B27G11/00B27D1/06B27D1/04
Inventor 周晓燕周定国梅长彤潘明珠郑大鹏
Owner NANJING FORESTRY UNIV
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