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Structure plywood plate for timber-construction and production method thereof

A technology for plywood and construction, which is used in the joining of wooden veneers, chemical instruments and methods, and layered products, etc., can solve the problems of high production costs, application limitations, and high plywood density, and achieves lower production costs and lower costs. The effect of construction cost and high mechanical performance

Active Publication Date: 2009-06-17
BEIJING FORESTRY MACHINERY RES INST OF STATE FORESTRY ADMINISTRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the veneers used in plywood production are thin veneers, and the thickness of each veneer is less than 2 mm, so multi-layer veneers need to be glued and hot-pressed. In the production of veneer, most of the inner boards (core boards) except the surface and back boards need to be glued on both sides. Not only the processing technology is complicated, the production efficiency is low, but also the amount of glue used is very large.
On the other hand, the plywood processed in this way has a high density and is not suitable for use as structural plywood such as wall panels, floor panels, and roof panels for light houses.
[0007] In short, for a long time, people have mainly used high-density wood to make plywood, and mostly used thin veneer gluing and hot pressing to process plywood. Not only the utilization rate of wood is low, but also it is not conducive to the efficient use of wood resources.
In order to satisfy plywood production, the current veneer rotary cutting technology is also based on thin veneer rotary cutting. In addition, the amount of glue applied and the workload of gluing in the gluing process are very large, and the high production cost is not conducive to the rapid development of the plywood industry.
On the other hand, my country's forest resources are seriously insufficient, and the structure of timber resources is changing from natural forests to artificial forests. However, the biggest disadvantage of artificial fast-growing forests is that they are soft, and many of them can only be used as pulp materials. App is restricted

Method used

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  • Structure plywood plate for timber-construction and production method thereof
  • Structure plywood plate for timber-construction and production method thereof
  • Structure plywood plate for timber-construction and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Structural plywood for five-ply poplar timber structures

[0046] Such as figure 1 As shown, the surface board 1 and the back board 5 of the structural plywood for the wooden structure are poplar veneers of about 1.5 mm, and the middle three core boards 2 are all poplar veneers of 3.0 mm, and the lines between the five veneers Formed into criss-cross blanks, the thickness of the processed plywood is 9 mm, and the veneer is processed by drying, forming, gluing, cold pressing, aging, and hot pressing. The specific production steps are as follows:

[0047] Log sawing: sawing poplar logs into wood sections according to the required size;

[0048] Log rotary cutting: peel poplar logs into 1.5 mm thick surface veneer, back veneer, and 3.0 mm core veneer;

[0049] Drying: Dry the rotary-cut veneer with drying equipment, so that the moisture content of the dried veneer is as follows: the moisture content of the core veneer should be about 8%, and the moisture content of the ...

Embodiment 2

[0060] Structural plywood for seven-layer eucalyptus poplar composite wood structure

[0061] Such as figure 2 As shown, in the blank of the structural plywood for wood structure, the surface board and the back board are respectively composed of two layers of veneers, that is, the surface veneer 1 and the back layer veneer 4 are poplar veneers of 1.8 mm, and the subsurface The veneer 2 is a 1.5 mm domestic eucalyptus veneer, and the middle three layers are a 3.5 mm poplar core veneer 3 . Among them, the surface veneer 1 and the adjacent subsurface eucalyptus veneer 2, the back layer veneer 4 and the adjacent subsurface eucalyptus veneer 2 are respectively arranged in parallel grains, and then connected with the remaining three-layer core veneer 3 The blanks are assembled in a criss-cross arrangement of lines, and the thickness of the processed plywood is 15 mm. Concrete production method steps are as follows:

[0062] Log sawing: saw poplar and eucalyptus logs into wood se...

Embodiment 3

[0075] Structural plywood for seven-layer pine-poplar composite wood structure

[0076] Such as image 3 As shown, in the blank of the structural plywood for wood structure, the front panel and the back panel are composed of two layers of veneers respectively, that is, the surface veneer 1, the back veneer 4 and the subsurface 2 are 2.0mm domestic larch veneer, the middle three layers are 4.0 mm poplar core veneer 3. Among them, the veneers of each layer are assembled in a criss-cross arrangement of lines, and the thickness of the processed plywood is 18 mm. Concrete production method steps are as follows:

[0077] Log sawing: saw poplar and larch logs into wood sections according to the required size;

[0078] Log rotary cutting: Rotate poplar logs into poplar veneers with a thickness of 4.0 mm; rotate larch logs into larch veneers with a thickness of 2.0 mm;

[0079] Drying: Dry the rotary-cut veneer with drying equipment. The moisture content of the dried veneer is as f...

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Abstract

The invention provides a structural plywood for a wood structure building and a manufacturing method thereof. The structural plywood consists of 3 to 9 layers of log rotary cut veneers which are assembled according to odd layers and then subjected to gluing and hot pressing; a surface board and a back board of the plywood consist of one to two layers of veneers with the thickness of between 1 and 3.0 millimeters, and the moisture content of the veneers is between 6 and 12 percent; the thickness of a core layer veneer positioned between the surface board and the back board is between 3.0 and 8.0 millimeters, and the moisture content is between 2 and 12 percent; and the thickness and the moisture content of the veneers are based on the veneers before hot pressing, and the hot pressing shrinkage ratio of the plywood is smaller than 30 percent. The plywood is formed by gluing and hot pressing thick veneers, in particular formed by compounding artificial forest lumber with lower and middle densities, has the characteristics of small density and light weight at the same time of improving performance, reduces use amount of an adhesive, and is particularly suitable for light wood structure buildings.

Description

technical field [0001] The invention relates to the processing technology of building plywood, in particular to a kind of structural plywood for wood structure building with artificial forest wood as raw material and a production method thereof. Background technique [0002] At present, plywood technology is only researched and produced for ordinary decorative plywood, building templates, container floors, and automobile compartment floors. Among them, although building templates and container floors belong to the category of structural plywood, structural plywood for wood structures in the true sense belongs to the primary stage of research and utilization. Research and development, so far no relevant reports. In recent years, the rapid development of wood structure housing in my country has significantly increased the demand for structural plywood for wood structures. [0003] Structural plywood for wood structure is different from ordinary plywood. Environment and clim...

Claims

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Application Information

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IPC IPC(8): B27D1/04B32B21/13B32B1/08
Inventor 费本华赵荣军姚利宏陶仁中
Owner BEIJING FORESTRY MACHINERY RES INST OF STATE FORESTRY ADMINISTRATION
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