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A kind of preparation method of recombinant wood

A technology of reconstituted wood and pre-curing, applied in the direction of wood heating, wood impregnation, and manufacturing tools, etc., can solve the problems of insufficient strength, difficult to achieve, insufficient toughness, etc., and achieve the effect of improving curing uniformity, improving uniformity, and preventing cracking.

Active Publication Date: 2021-03-09
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

This is because the recombined wood substrate is wrapped in a metal mold after the pressing process, and the microwave cannot penetrate the metal to directly solidify the material, while the non-metallic material mold that the microwave can pass through due to insufficient strength or toughness during the pressing process If it is not enough, it cannot meet the production needs, so it is very difficult to use microwave heating for one-time curing of recombined wood substrates

Method used

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  • A kind of preparation method of recombinant wood
  • A kind of preparation method of recombinant wood

Examples

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preparation example Construction

[0026] The invention provides a method for preparing recombined wood, comprising the following steps:

[0027] a) The recombined wood material impregnated with thermosetting resin glue is pressed in a mold to obtain a recombined wood lumber to be cured; then the restructured wood lumber to be cured is heated and cured, demoulded to obtain a pre-cured restructured wood lumber;

[0028] b) along the length direction of the pre-cured recombined timber, install a fixed plywood on its two opposite sides; Metal plate;

[0029] c) Microwave irradiation is carried out along the length direction of the pre-cured recombined wood square on its two side surfaces not equipped with the fixing splints to obtain recombined wood.

[0030] In the preparation method provided by the present invention, firstly, the recombined wood raw material is immersed in the glue solution of thermosetting resin. Wherein, the recombined wood raw material is preferably a wood veneer that has been decomposed an...

Embodiment 1

[0047] 1) Rotary cutting: Use the veneer rotary cutting machine to process poplar logs imported from Russia and then peel and trim the edges to make a rectangular wooden veneer. The size and moisture content parameters of the veneer after rotary cutting are: length The thickness is 1300mm, the width is 550mm, the thickness is 1.3±0.15mm, and the moisture content is 120±20%. The veneers that have been peeled are neatly stacked on the temporary bracket and temporarily stored, and then enter the next step of processing.

[0048] 2) Deflagging: Send the rotary-cut wood veneers to the deflaking machine one by one according to the longitudinal grain direction of the fiber arrangement. The gap between the pressing rollers of the deflaking machine is controlled to be 0.9±0.1mm, and the speed of the pressing rollers is 50r / min. After defrosting, the treated veneer is obtained. The veneer after the disentangling treatment is a network structure veneer that is not broken in the longitud...

Embodiment 2

[0058] 1) Rotary cutting: use a rotary cutting machine to cut Shandong fast-growing poplar into wooden veneers. The thickness of the veneer is 1.7±0.1mm, the width is 600mm, the length is 650mm, and the moisture content is 130±10%.

[0059] 2) Deflagging: According to the deflaking method in Example 1, the only difference is that the gap between the rollers of the deflaker is 1.0±0.1mm, and the rotational speed of the rollers is 40r / min.

[0060] 3) Drying before gluing: Put the treated veneers obtained by defrosting into a mesh belt dryer for drying treatment at a temperature of 80-120°C to make the moisture content to 10±3%;

[0061] 4) Impregnation glue: use the phenolic resin impregnation glue in Example 1, dilute the glue solution to a solid content of 20-25wt%, adopt the method of normal pressure dipping, the dipping time is 20min, and the dipping amount is controlled at the veneer 20 ± 2 wt% of the mass. After the dipping is completed, take out the wood veneer, drain t...

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Abstract

The invention belongs to the field of artificial wood material processing, and particularly relates to a preparation method of recombined wood, wherein the method comprises the following steps: a) pressing a recombined wood raw material impregnated with a thermosetting resin glue solution in a mold to obtain a to-be-cured recombined wood lumber; and then heating and curing the to-be-cured recombined wood lumber, and demolding, to obtain a pre-cured recombined wood lumber; b) mounting fixed clamping plates on two opposite side surfaces of the pre-cured recombined wood lumber along the length direction of the pre-cured recombined wood lumber; and c) carrying out microwave irradiation on the two side surfaces, which are not provided with the fixed clamping plates, of the pre-cured recombinedwood lumber along the length direction of the pre-cured recombined wood lumber, to obtain the recombined wood. According to the preparation method, in the curing stage, a conventional heat source is firstly used for conducting short-time heating curing on the surface layer of the to-be-cured recombined wood lumber, and a self-forming mold curing layer is formed; and then secondary curing is carried out by utilizing the three-dimensional heating characteristic of microwaves, so that the purpose of rapid and uniform curing is achieved.

Description

technical field [0001] The invention belongs to the field of artificial wood material processing, and in particular relates to a preparation method of recombined wood. Background technique [0002] Reconstituted wood refers to a new type of wood produced by using fast-growing forest wood as the main raw material and impregnated thermosetting resin as a modifier. After impregnation, low-temperature drying and pressing, it is produced by a thermosetting process. It can be used for furniture manufacturing and building materials. [0003] The traditional curing method is to use a tunnel-type curing kiln to heat and cure the recombined wood by using the heat energy generated by steam or fuel. During the curing process, the heat energy acts on the outside of the material after heat conduction, and then conducts to the inside of the wood through the adjacent layer. The modifier in the material produces a cross-linking reaction at a higher temperature to realize the curing of the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K3/02B27K5/00B27K3/38B27N3/08
CPCB27K3/02B27K3/38B27K5/001B27K5/0055B27N3/08
Inventor 王连文焦学亮柳金章王卫光李双昌
Owner CHAMBROAD CHEM IND RES INST CO LTD
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