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Preparation method for high-strength poplar veneer

A poplar veneer, high-strength technology, used in wood treatment, impregnating wood, manufacturing tools, etc., can solve problems such as poor mechanical properties and limited application scope, achieve modified mechanical properties, increase total free energy, and improve porosity. Effect

Inactive Publication Date: 2018-01-09
吴刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing high-strength poplar veneer in view of the defects that the existing poplar single-layer lumber has poor mechanical properties and the application range is greatly limited

Method used

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  • Preparation method for high-strength poplar veneer

Examples

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Effect test

example 1

[0019] Take a poplar veneer with a thickness of 2mm, dry it at 65°C until the moisture content is 8%, polish the surface of the poplar veneer with water-resistant sandpaper, and then dry it at 100°C to constant weight to obtain a dry poplar veneer. board, take the dry poplar veneer and place it at 105°C for pre-steaming for 10 minutes, collect the steamed veneer and soak the steamed veneer until the mass fraction of 2% xylanase solution is placed in the After soaking in a beaker at 35°C for 6 hours, take the impregnated poplar veneer and rinse it with deionized water for 3 times, and dry it in vacuum to obtain the enzymatically modified poplar veneer; Put 45 parts of deionized water, 3 parts of peach gum, and 2 parts of sugar alcohol in a beaker, and ultrasonically disperse at 200W for 10 minutes to obtain a dispersion coating solution; apply the dispersion coating solution evenly to the enzymatically modified poplar veneer On the surface, the coating thickness is controlled t...

example 2

[0021] Take a poplar veneer with a thickness of 2mm, dry it at 67°C until the moisture content is 9%, polish the surface of the poplar veneer with water-resistant sandpaper, and then dry it at 105°C to constant weight to obtain a dry poplar veneer. board, take the dry poplar veneer and place it at 105°C for pre-steaming for 12 minutes, collect the steamed veneer and soak the steamed veneer until the mass fraction of 2% xylanase solution is placed in the After soaking in a beaker at 37°C for 7 hours, take the impregnated poplar veneer, rinse it with deionized water for 4 times, and dry it in vacuum to obtain the enzymatically modified poplar veneer; Put 47 parts of deionized water, 4 parts of peach gum, and 2 parts of sugar alcohol in a beaker, and ultrasonically disperse at 250W for 12 minutes to obtain a dispersion coating solution; apply the dispersion coating solution evenly to the enzymatically modified poplar veneer On the surface, the coating thickness is controlled to b...

example 3

[0023] Take a poplar veneer with a thickness of 2mm, dry it at 70°C until the moisture content is 10%, polish the surface of the poplar veneer with water-resistant sandpaper, and then dry it at 110°C to constant weight to obtain a dry poplar veneer. board, take the dry poplar veneer and place it at 105°C for pre-steaming for 15 minutes, collect the steamed veneer and soak the steamed veneer until the mass fraction of 2% xylanase solution is placed in the After soaking in a beaker at 40°C for 7 hours, take the impregnated poplar veneer, rinse it with deionized water for 5 times, and dry it in vacuum to obtain the enzymatically modified poplar veneer; Put 50 parts of deionized water, 5 parts of peach gum, and 3 parts of sugar alcohol in a beaker, and ultrasonically disperse at 300W for 15 minutes to obtain a dispersion coating solution; apply the dispersion coating solution evenly to the enzymatically modified poplar veneer On the surface, the coating thickness is controlled to ...

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Abstract

The invention relates to a preparation method for a high-strength poplar veneer and belongs to the technical field of laminate materials. After the poplar veneer is soaked with xylanase, the bulk of the material is effectively improved, the devillicate degree of fiber is improved, the specific surface area of the fiber is enlarged, the tightness of the veneer material is improved, the voidage in veneer tissue is reduced, the surface pores of the poplar plank material are effectively improved, meanwhile, sugar alcohol can permeate cell walls of the material through diffusion, and the veneer hygroscopicity is reduced and the cell walls are enhanced through furfuryl alcohol resin solidified in the cell walls in chaff alcoholizing manner; by means of the blockage effect, the water absorptionrate of the cell walls and the deformation-recovery rate are delayed, and the mechanical performance of the material is effectively improved; the step of veneer sanding is a pretreatment step, the total free energy of the surface of the immersed and compressed veneer can be obviously increased through sanding treatment, peach gum can be effectively adsorbed, by cooperating with enzymolysis, the peach gum material permeates into the cell walls, and the mechanical performance of the modified composite veneer material is effectively improved.

Description

technical field [0001] The invention relates to a method for preparing a high-strength poplar veneer, which belongs to the technical field of building materials. Background technique [0002] The main advantages of laminated veneer lumber are as follows: LVL is produced using small-diameter wood, bent wood, and short logs, which reflects the value-added effect of large-scale use of small wood and excellent use of inferior wood. The specifications are flexible and changeable. You can choose freely, because the veneer can be lengthened vertically, so the length of the product can not be limited by the size of the log or the specification of the veneer, which can meet the needs of long-span beams, vehicles and ships. Defects such as cracks are evenly distributed in the veneer, which reduces its impact on product strength. The strength-to-weight ratio of laminated veneer lumber is better than that of steel, and has uniform engineering properties. Studies have shown that veneer l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/02B27K5/00B27K3/36B27K5/04B27K3/12B27K3/50B27K3/38
Inventor 吴刚季美
Owner 吴刚
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