Method for improving wood density of planted forest

A technology of artificial forest and wood, applied in the direction of pressure impregnation, etc., can solve the problems of poor material and high proportion

Active Publication Date: 2014-04-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Plantation harvested timber is of poor quality due to the high proportion of young timber in the timber

Method used

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  • Method for improving wood density of planted forest
  • Method for improving wood density of planted forest

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Select artificial forest fir wood with a diameter of less than 30cm (growth age: 25 years, diameter about 20-25cm) harvested in March 2013, wrap and seal the above artificial forest fir wood with polyethylene plastic film, and put it into In the ultra-high pressure processing container, it is firstly subjected to a high-pressure treatment at 200MPa for a 5-minute holding time, and immediately after the pressure is released, it is then subjected to a pressure treatment at 400Mpa for a 5-minute holding time, and then taken out after treatment. The volume and mass of the plantation fir wood before and after treatment were measured, and the density was calculated.

Embodiment 2

[0032] Embodiment 2, it is 25 years in the embodiment 1 that the artificial forest fir tree that the diameter is about 20~25cm is changed into the artificial forest fir wood that the growth year is 20 years, the diameter is about 13~16cm; All the other are the same as embodiment 1.

[0033] After the above treatment, the density of the artificial forest fir is changed from the original 0.59g / cm 3 increased to 1.12g / cm 3 .

Embodiment 3

[0034] Embodiment 3, it is 25 years that the growth period is 25 years in embodiment 1, and the artificial forest fir tree that diameter is about 20~25cm changes growth period into 30 years, and the plantation forest fir tree that diameter is about 25~29cm. All the other are with embodiment 1.

[0035] After the above treatment, the density is changed from the original 0.63g / cm 3 increased to 1.08g / cm 3 .

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Abstract

The invention relates to a method for processing wood, and particularly discloses a method for improving wood density of a planted forest. The method comprises the following steps: 1) sealing the wood of the planted forest; 2) firstly carrying out pressure-maintaining treatment on the wood of the planted forest sealed in the step 1) under 200MPa for 4-6 minutes, and then carrying out pressure-maintaining treatment at 400MPa for 4-6 minutes. By adopting the method disclosed by the invention, the density of the wood of the planted forest can be effectively improved.

Description

technical field [0001] The invention relates to a wood processing method, in particular to a method for increasing the wood density of plantation forests. Background technique [0002] With the depletion of natural forest resources worldwide and the implementation of the National Natural Forest Protection Project, artificial forest timber will become the main species of timber to alleviate the contradiction between supply and demand in the domestic and foreign timber markets in the future. Plantation forest timber mainly includes fir, pine, poplar, paulownia and eucalyptus, all of which have the characteristics of fast growth, high yield and short harvesting cycle. Due to the high proportion of juvenile wood in the wood, the material quality of the harvested wood in the plantation forest is poor. With the improvement of human requirements for the value of wood applications, the inherent defects of this kind of wood such as low density are becoming more and more prominent. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/08
Inventor 于勇潘芳朱松明李建平苏光明
Owner ZHEJIANG UNIV
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