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High-performance laminated veneer lumber panel and production method thereof

A veneer lamination and production method technology, applied in the direction of layered products, wooden veneer joints, chemical instruments and methods, etc., can solve problems such as high cost, low mechanical properties, and large variability of wood veneers. Achieve the effects of improving bending and wear resistance, improving dimensional stability, and adding bending-resistant reinforcement layer

Active Publication Date: 2015-02-11
NINGBO ZHONGJIA LOW CARBON NEW TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the production technology level of my country's laminated veneer panels is relatively backward, and it is difficult to meet the market's requirements for high-performance laminated veneer panels.
In a nutshell, the disadvantages are: the large variability of wood veneers leads to unstable product performance and affects the engineering design of wood components; the time-consuming and high cost of veneer impregnation and reinforcement treatment hinders the market of veneer impregnation reinforcement technology Promotion; slab structure is unreasonable, resulting in low mechanical properties of the product (such as static bending strength, shear strength, elastic modulus, wear resistance) and unstable dimensions

Method used

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  • High-performance laminated veneer lumber panel and production method thereof
  • High-performance laminated veneer lumber panel and production method thereof
  • High-performance laminated veneer lumber panel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Production of laminated veneer lumber (LVL) by grading and partial impregnation of veneers

[0034] For the imported North American twisted leaf pine, the veneer with a thickness of 3.2mm is obtained by rotary cutting, and dried to a moisture content of 3-6%.

[0035] Before the veneer is graded, the density ρ range of the veneer is determined to be 0.3g / cm 3 to 0.6g / cm 3 , the average density ρ of all veneers is 0.473g / cm 3 , the standard deviation is 0.044g / cm 3 , figure 2 is the cumulative distribution function of the veneer density before veneer grading. figure 2 Among them, the ordinate represents CDF (cumulative distribution function); the abscissa represents the density of dry veneer in g / cm 3 .

[0036] Measure the propagation time t of the stress wave in the length direction of the veneer according to the length of each veneer l veneer density ρ with MOE=ρv 2 Calculate the dynamic elastic modulus MOE of each veneer. The dynamic elastic modu...

Embodiment 2

[0044] Example 2: Production of laminated veneer boards (LVB) (veneer grading + impregnation of 2 veneers each on the surface layer and the bottom layer)

[0045] The difference between Example 2 and Example 1 is that the preform structure in Example 2 is a symmetrical structure, specifically, the surface layer and the bottom layer are respectively two layers of high-grade impregnated E1 veneers 1, 2, 12, and 13;

[0046] The two balance layers adjacent to the surface layer and the bottom layer are each a layer of high-grade impregnated E1 veneer 3, 11;

[0047] The core layer is 7 sheets of low-grade glue-coated E2 veneers 4-10; the grain direction of the balance layer is perpendicular to the grain direction of other veneers, see Figure 5 . Other processes are the same as in Example 1. The resulting laminated veneer boards were sawed and tested for their properties. The results are shown in Table 3.

Embodiment 3

[0048] Example 3: Production of laminated veneer boards (LVB) (veneer grading + impregnation of 1 veneer each for the surface layer and the bottom layer)

[0049] The difference between Example 3 and Example 1 is that the preform structure in Example 3 is a symmetrical structure, specifically, the surface layer and the bottom layer are respectively one layer of high-grade impregnated E1 veneer 1, 13;

[0050] The two balance layers adjacent to the surface layer and the bottom layer are each a layer of high-grade impregnated E1 veneer 2, 12; the core layer is 9 sheets of low-grade glue-coated E2 veneer 3-11; the grain direction of the balance layer is perpendicular to the grain of other veneers direction, see Figure 6 . Other processes are the same as in Example 1. The resulting laminated veneer boards were sawed and tested for their properties. The results are shown in Table 3.

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Abstract

The invention provides a high-performance laminated veneer lumber panel with high strength, high MOE (modulus of elasticity), high dimensional stability, high abrasion resistance and low deformation as well as a production method of the high-performance laminated veneer lumber panel. The method comprises the steps of dividing veneer dynamic MOE into high and low levels or high, medium and low three levels; mixing high molecular weight phenolic resin with low molecular weight phenolic resin to obtain a steeping liquor; steeping part of veneers with the steeping liquor and then drying; coating a common phenolic resin adhesive onto non-steeped veneers, and then performing assembly and hot-pressing. The laminated veneer panel assembling is characterized in that 1-2 layers of high or medium-level steeping veneers are used as a surface layer and a bottom layer; 1 layer of high, medium or low-level steeping veneer is used as a balance layer; a plurality of medium or low-level coated veneers are used as a core layer taken as a symmetrical layer; the laminated veneer lumber assembling is characterized in that a surface layer, a core layer, a bottom layer and a bending resistant reinforcing layer are sequentially arranged from top to bottom, and textures of all layers are parallel with the veneer length direction; the surface and bottom layers are 1-3 layers of medium or low-level steeping veneers; a plurality of low-level coated veneers are used as the core layer; the bending resistant reinforcing layer is 1 layer of high-level steeping veneer.

Description

technical field [0001] The invention relates to a production method of a high-performance laminated veneer board, in particular, a method for efficiently manufacturing a high-performance laminated veneer board by using ordinary wood or low-grade wood. Background technique [0002] Laminated veneer is a new type of engineering structural material that is made of wood veneers after rotary cutting, which are glued, formed along the grain, and pressed. Due to its stable performance, high strength, easy processing, and can replace large-diameter grades The use of solid wood sawn timber and other advantages is favored by the market. [0003] There are two types of laminated veneer boards, one is laminated veneer board (LVB) and the other is (thick) laminated veneer lumber (LVL). The width of the veneer laminate is much greater than the thickness, and it is often used as a car board. (Thick) laminated veneer lumber is generally thicker than 30mm, often used as beams or columns. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B21/04B27D1/04G01N9/36
Inventor 王建和卫佩行徐英熙葛文枝
Owner NINGBO ZHONGJIA LOW CARBON NEW TECH RES INST
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