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Wood veneer treatment method and reconstituted wood

A processing method and veneer technology, which is applied in wood compression, wood processing equipment, other plywood/plywood equipment, etc., can solve the problem of warping and deformation of recombined wood, long time of dipping of wooden veneer, and the amount of dipping and uneven pavement, to reduce the risk of cracking, improve density uniformity, reduce initial stress and pressing pressure

Inactive Publication Date: 2017-02-22
CHAMBROAD CHEM IND RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production process of recombined wood has problems such as long soaking time of wood bundle units, uneven dipping amount and uneven paving, which lead to easy cracking and wire skipping of the produced recombined wood products
[0003] In order to improve the above shortcomings, the recombined wood with wooden veneer unit structure has been successfully developed. Although it can reduce the cracking and wire jumping caused by the amount of glue dipped in wood bundle units and uneven paving to a certain extent, the use of wooden veneer unit The recombined wood directly pressed by the board is prone to warping and deformation, and the dipping time of the wooden veneer is longer, and the dipping amount is unevenly distributed

Method used

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  • Wood veneer treatment method and reconstituted wood
  • Wood veneer treatment method and reconstituted wood
  • Wood veneer treatment method and reconstituted wood

Examples

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preparation example Construction

[0031] In the preparation method of the above-mentioned recombined wood provided by the present invention, firstly, the treated veneer is dipped in glue. Wherein, the glue used for dipping is preferably phenolic resin impregnated glue; the solid content of the glue is preferably 20 to 25wt%; the dipping method is preferably normal pressure dipping; the dipping time is preferably 5-60 min, more preferably 10-20 min; the dipping amount of the dipping is preferably controlled at 15-30 wt%, more preferably 16-25 wt%, and most preferably 20±2 wt%. In the present invention, it is preferable to dry the treated veneer before dipping, so as to reduce the moisture content of the veneer. The drying temperature is preferably 80-120°C; the moisture content of the dried veneer is preferably 8-12%.

[0032] After dipping, drain the liquid, and enter the next process when there is no obvious liquid dripping, that is, press the veneer after dipping. In the present invention, the pressed dens...

Embodiment 1

[0037] wood veneer treatment

[0038] 1) Rotary cutting: using a rotary cutting machine to cut Russian poplar into wooden veneers, the thickness of the veneer is 1.3±0.1mm, the width is 250mm, the length is 650mm, and the moisture content is 130±10%;

[0039] 2), roll pressing:

[0040] Put the wooden veneer into the roller press according to the direction of its fiber transverse grain for rolling. The rolling process is as follows: figure 1 as shown, figure 1It is a schematic diagram of the rolling process of the wooden veneer provided in Example 1 of the present invention, wherein, G1 is the upper roll, G2 is the lower roll, 1 is the veneer before rolling, 2 is the veneer after rolling, the upper and lower rolls G1 and The main body of G2 is a cylindrical smooth cylinder with no teeth and threads on the surface of the cylinder. In this embodiment, the gap between the pressure rollers G1 and G2 is controlled to be 1±0.1 mm, the rotational speed of the lower roller is 20 r / ...

Embodiment 2

[0042] Preparation of recombinant wood

[0043] 1) Drying before gluing: Put the treated veneer obtained in Example 1 into a mesh belt dryer for drying treatment at a temperature of 80-120°C to make the moisture content within 8-12%;

[0044] 2), dipping: prepare water-based low molecular weight phenolic resin dipping solution, the specific method is: phenol, methanol and sodium hydroxide are synthesized according to the molar ratio of 1:1.8:0.2 phenolic resin dipping solution, the solid content of the glue is 40wt %, the viscosity at 25°C is 20S, and the pH is 11; dilute the glue solution to a solid content of 20-25wt%, adopt the method of normal pressure dipping, the dipping time is 10min, and the dipping amount is controlled at 20±2wt of the veneer quality %. After the dipping is completed, take out the wood veneer, drain the liquid, and enter the next process when there is no obvious liquid dripping;

[0045] 3) Drying after gluing: Put the dipped veneer into a mesh belt...

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Abstract

The invention belongs to the field of wood processing, and particularly relates to a wood veneer treatment method and reconstituted wood. The method comprises the step of placing a wood veneer in a rolling machine according to the fibre cross-grain direction thereof, and rolling to obtain a treated veneer, wherein a roll gap of the rolling machine is 10-80% of a thickness of the wood veneer. With the adoption of the method provided by the invention, the wood veneer can be rolled into a broomed-meshy-structure veneer with fibres which are not broken in a longitudinal direction and loose in a transversal direction, a natural texture structure of raw wood is reserved, the rigidity of the veneer is eliminated, and an initial stress and a pressing pressure are reduced, thus the density uniformity of the pressed reconstituted wood is improved, and the warping and deformation of the reconstituted wood are reduced; meanwhile, the surface area of the treated veneer is increased, and glue dipping is more uniform, thus a cracking risk of the prepared reconstituted wood is reduced; and in addition, fine fibres in the treated veneer are mutually interleaved to increase an internal binding force, thus cracking and warping risks caused by the reconstituted wood are further reduced.

Description

technical field [0001] The invention belongs to the field of wood processing, in particular to a wood veneer treatment method and recombined wood. Background technique [0002] Recombined wood is a new type of wood material made of wood bundle units after dipping and pressing without disturbing the direction of wood fiber arrangement and retaining the basic characteristics of wood. It not only has the natural wood texture structure of logs, but also has It has higher strength than logs, and the size specifications of the products are also easy to adjust. At present, in the production process of recombined wood, there are problems such as long dipping time of wood bundle units, uneven dipping amount and uneven paving, which lead to easy cracking and wire skipping of the produced recombined wood products. [0003] In order to improve the above shortcomings, the recombined wood with wooden veneer unit structure has been successfully developed. Although it can reduce the cracki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D5/00B27M1/02
CPCB27D5/00B27M1/02
Inventor 贾波张云奎金太权柳金章刘振学于钧宇王卫光孙彬
Owner CHAMBROAD CHEM IND RES INST CO LTD
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