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Regenerated particles, particle board and preparation method thereof

The technology of particleboard and shavings is applied in the field of particleboard raw materials and its preparation, which can solve the problems of poor shape of shavings, damage, long hydrothermal treatment time, etc., and achieve the effect of improving the plasticity of wood

Inactive Publication Date: 2010-06-09
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The article "Using waste wood to produce high-quality wood chips for wood-based panels" in the 6th issue of Volume 30 of "Forest Industry" in 2003 discloses the layout plan of the second-level equipment of Meyer Company: the whole configuration is broken by the first-level System, manual sorting bin, second-stage crushing system, screening machine, and dust removal system. This system can obtain high-quality shavings for waste wood processing, but this system has limitations when processing waste particleboard: the original shape of shavings can be regenerated Severe damage during the crushing process will affect the static bending strength and elastic modulus of the product; mechanical crushing cannot completely destroy the glue layer, the shape of the shavings is poor, and the granular shavings produced affect the uniformity of the slab paving in the later stage, resulting in product performance. Unstable, and at the same time, the granular surface shavings of the particleboard are very abrasive to the sanding belt
[0005] "Wood Processing Machinery" ("Research on Water Boiling Technology of Waste Particleboard", No. 2, 2008, Wang Xia, etc.) studied the characteristics of poor water resistance of ordinary particleboard using urea-formaldehyde resin adhesive, and treated waste particleboard with hot water at different temperatures. The method can destroy the glue layer so that the shavings can be separated and the shape of the shavings can be maintained, but the hydrothermal treatment takes a long time, the moisture content of the shavings increases greatly, and it is difficult to industrialize production

Method used

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  • Regenerated particles, particle board and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The waste particleboard prepared from a single species of Chinese fir is made into shavings according to the following steps:

[0023] 1. Remove metal connectors, plastics, soil and other impurities in waste particleboard;

[0024] 2. Using a chipper (SiempelKamp, Germany) to break the particleboard into pieces;

[0025] 3. Screen out unqualified fragments with a size larger than 40mm×40mm, and at the same time separate debris such as sand, plastic, and small pieces of metal;

[0026] 4. Send the fragments into the blasting device, first pass 1.0MPa saturated steam for treatment, and maintain the pressure in the blasting device at 1.0MPa, and keep it for 5 minutes, when the blasting pressure in the blasting device rises to 2.0MPa, Open the discharge valve of the blasting device, so that the fragments are instantly blasted and sprayed into the receiving container to obtain recycled shavings.

[0027] 5. Dry the recycled shavings to the required moisture content of 3-5%...

Embodiment 2

[0037] In the process of making waste particleboard into regenerated shavings, in addition to using mixed tree species to prepare waste particleboard, and introducing 1.2MPa saturated steam to maintain the steam treatment pressure in the blasting device at 1.2MPa for 3 minutes and the blasting pressure at 2.5 Except MPa, all the other are the same with embodiment 1.

[0038] In the process of preparing particleboard by using recycled shavings, the weight ratio of new shavings and recycled shavings is 1:1.5, and the new shavings are mixed shavings, the rest is the same as that of Example 1.

[0039] The performance test results of the prepared particleboard are shown in Table 1.

Embodiment 3

[0041] In the process of making waste particleboard into regenerated shavings, except for the waste particleboard prepared by mixed tree species, 1.5MPa saturated steam was introduced to maintain the steam treatment pressure in the blasting device at 1.5MPa for 3 minutes and the blasting pressure at 2.0 MPa, all the other are the same with embodiment 1.

[0042] In the process of preparing particleboard with recycled shavings, except that the weight ratio of new shavings and recycled shavings is 1:0.67, and the new shavings are mixed shavings, the rest is the same as in Example 1.

[0043] The performance test results of the prepared particleboard are shown in Table 1.

[0044] Table 1 product performance test results

[0045]

Performance Testing

density

g / cm 3

moisture content

%

static bending strength

MPa

Elastic Modulus

MPa

internal binding strength

MPa

Water absorption thickness

Exp...

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Abstract

The invention relates to regenerated particles and a method thereof for preparing a particle board, and the method comprises the steps of breaking the waste particle board, then blasting, preparing the regenerated particles, and mixing the prepared regenerated particles with new particles for preparing the particle board. The method separates the particles by breaking a rubber layer of the waste particle board through blasting, thereby keeping the shape of the original particles complete, and having small affects on physical and chemical properties of the particles; furthermore, the high-temperature steaming treatment of wood can improve the plasticity of the wood, and the performance indexes of the particle board prepared by utilizing the regenerated particles can meet the requirements of the national standards for the particle boards (GB / T4897.2-2003 and GB / T17657-1999).

Description

technical field [0001] The invention relates to an artificial board raw material, an artificial board and a preparation method thereof, in particular to a particle board raw material, a preparation method thereof and a method for preparing particle board from the particle board raw material. Background technique [0002] In recent years, due to the lack of forest resources in our country, the supply of wood has been very tight; at the same time, the rapid economic development has driven the furniture and home improvement industry. Every year, a large number of wood-based panel products are eliminated from the replacement, and a large number of waste particleboards appear. Reasonable use of these Waste products can alleviate the shortage of wood-based panel production resources, and at the same time, it is beneficial to environmental protection. [0003] The manufacture of recycled shavings is a key link in the use of waste wood or wood-based panels to manufacture recycled pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27L11/02B27N3/02
Inventor 张德荣于志明李建章任明海母军张颖
Owner BEIJING FORESTRY UNIVERSITY
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