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Glue-free reconstituted veneer and preparing method thereof

A technology for veneer and wood, applied in the field of glue-free reconstituted veneer and its preparation, can solve problems such as toxic and harmful volatiles, and achieve the effects of high market value, good dimensional stability, and control of raw material costs

Active Publication Date: 2021-04-13
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing restructured veneer uses adhesives to release toxic and harmful volatiles, the present invention provides a restructured veneer glued without glue and a preparation method thereof

Method used

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  • Glue-free reconstituted veneer and preparing method thereof
  • Glue-free reconstituted veneer and preparing method thereof
  • Glue-free reconstituted veneer and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] This example provides a method for preparing recombined veneer without glue, using a delignification solution to perform delignification treatment on fast-growing wood veneers to obtain delignified wood samples, and removing the delignified wood samples from the obtained delignified wood samples by cold pressing. 80% moisture, and then hot-pressed and dried to obtain restructured veneer without glue.

Embodiment 2

[0026] This embodiment provides a method for preparing recombined veneer without glue, and the specific steps are as follows:

[0027] Step 1. Using a delignification solution to delignify the fast-growing wood veneer:

[0028] Put the fast-growing wood veneer with a thickness of 0.8-1.5mm in 1-2wt% sodium chlorite solution for vacuum treatment, so that the delignification solution can fully penetrate into the fast-growing wood veneer, and then place the fast-growing wood veneer in Keeping in 1-2 wt% sodium chlorite solution with a pH value of 4.6 controlled by glacial acetic acid for 4-8 hours at 80-100° C., natural cooling and washing with distilled water for 3-6 times to obtain delignified wood samples;

[0029] The fast-growing wood is any one or a combination of poplar, eucalyptus, Chinese fir, pine, willow, balsa and paulownia.

[0030] Step 2, remove the moisture in the obtained delignified wood sample by cold pressing:

[0031] Arrange and stack the delignified wood ...

Embodiment 3

[0035] This embodiment provides a kind of recombined veneer glued without glue, and the specific steps of its preparation method are as follows:

[0036] Step 1. Using a delignification solution to delignify the fast-growing wood veneer:

[0037] Put a poplar veneer with a thickness of 0.8mm in a 1wt% sodium chlorite solution for vacuum treatment, so that the delignification solution can fully penetrate into the fast-growing veneer, and then place the fast-growing veneer in a vacuum controlled by glacial acetic acid. Keep the 2wt% sodium chlorite solution with a pH value of 4.6 at 80° C. for 4 hours, and wash with distilled water 3 times after natural cooling to obtain a delignified wood sample;

[0038] Step 2, remove the moisture in the obtained delignified wood sample by cold pressing:

[0039] The delignified wood samples obtained in step 1 were stacked in three layers and placed between stainless steel filter screens with a pore size of 800 mesh. A layer of cardboard was...

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Abstract

Belongs to the technical field of wood processing. In order to solve the problem that an adhesive agent is adopted in an existing reconstituted veneer, and consequently, poisonous and harmful volatile matter is released, the preparing method of the glue-free reconstituted veneer comprises the steps that a fast-growing wood veneer is subjected to delignification by using a delignification solution to obtain a delignified wood sample; 80% of water in the delignified wood sample is removed through cold pressing; and after hot-pressing drying, a glue-free reconstituted veneer is obtained. According to the preparing method, hydroxyl on the surface of cellulose and hemicellulose is exposed through delignification, a multiple hydrogen-bond network is formed under pressure, and high mechanical strength and high size stability of the reconstituted veneer are given. In the preparing method, no adhesive agent is used, the reconstituted veneer is low in cost, simple in process and short in time, zero volatile of formaldehyde is really realized; the problems are solved that a great amount of the adhesive agent is used in artificial timbers, the indoor environment is polluted, and the human body health is harmed; and the glue-free reconstituted veneer has a higher market value.

Description

technical field [0001] The invention belongs to the technical field of wood processing, and in particular relates to a recombined veneer glued without glue and a preparation method thereof. Background technique [0002] Veneer veneer is a common decorative method used to improve the appearance characteristics of wood-based panels. The veneer is divided into natural veneer and artificial veneer. Natural veneer is made of precious wood as raw material and cut in different ways. It has the characteristics of rich texture and beautiful color, but the shortage of supply and high cost limit its wide application. The veneer produced with poplar and other economical fast-growing wood as raw materials has rough surface and poor mechanical properties, which cannot meet the needs of the market. The technical veneer made of fast-growing wood through a series of processes such as rotary cutting, sizing, billet formation, hot pressing, and planing, has been accepted by the market due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04B27D1/08B27K3/08
CPCB27K3/08B27D1/04B27D1/08
Inventor 许民孙浩纪彤毕红杰
Owner NORTHEAST FORESTRY UNIVERSITY
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