(2) green sawn timber of rubber wood can be treated with 2% TWP by vacuwm pressure or oscillating pressure methods and an enduring protection effect will be obtained with a retention dose of TWP in wood no less than 3.7 kg/m3;
Through the unified inspection on log and sawn timber of state enterprises in nine provinces, the results showed that the average percent of being qualified for dimension, grade and qualification batch of log and sawn timber were 94.13% and 87.62%, 98.78% and 98.55%, 88.50% and 92.8% respectively .
With the development of New Zealand forestry for more than fifty years, currently natural forest supplies less than 1% of sawn timber production and the rest are supplied from plantation.
Eucalyptus cloeziana is a potential saw timber species,the study on provenances and families shows that mean HT and mean DBH arrives to 7.45 m and 7.10 cm at 2.5 years old,and there are significant differences between provenances and families for all growth traits.
As a potential saw timber species, the mean HT and mean DBT of the 2 year old Eucalyptus pellita provenances and families trial are 7.69 m and 7.08 cm, survival percentage is 75.8%, significant differences between seed sources and families existed for all the 3 variants above.
To meaure surface rough degree of saw timber sample, It affects the quality of processing tibmer surface when band saw cvtting velocity and processing velocity are diffeaent.
Performance test results showed that Rich Acaica belongs to the wood drying classification of "difficult to dry", yet this study demonstrated that the quality was capable of reaching the Chinese National Standard second grade level for sawn lumber drying.
Therefore, it is very important to evaluate the vibration properties of the board in the round, especially for the sound radiation characteristic of radial sawn timber and its relationship to longitudinal sawn timber.
However, for the national and international experts, researches on radial sawn timber and its role and function in sound emission have not yet been developed.
This paper examines the costs and mitigation potential of the production of ethanol from biomass supplied from industrial wood waste as well as from trees harvested from afforested land.
It can be concluded that core chips and bast fibers from kenaf stems may substitute industrial wood chips in the middle and surface layers of the boards, respectively, up to 50%.
Bamboo chips were characterised by having higher length to thickness and length to width ratios and lower bulk density than industrial wood chip particles.