摘要:This report presents the results of the experiments on the wood of Pinus massoniana by indicators like dielectric constant, dielectric Phase angle, dielectric index number and resistivity artificial number of wood under different fibre directions, radio frenquency ranges and moisture contents. It holds a great importance in understanding better the properties and uses of this tree species in wood industry.
摘要:Molasses can be transformed by heat into substances which can react with wood or homopolymerize to produce bonding between wood Parts. It can replace phenol resin as binder. The proper pressing temperature lies in the range of 200-260℃. The pressing time is in the range of 8-12 rain. when the pressing temperature remains constant at 237℃, with pressing time increasing from 8-12 rain. the swelling rate of two hour-boiling test decreases form 18.5 % to 10.2%. When pressing time remains cbnstant for 8 rain., with the pressing temperature increasing from. 200-260℃, the swelling rate of two hour-boiling test decreases from 50.5% to,5.7%.
摘要:Some unadaptabilities concerning current National Standards for plywood (GB 738-739-75 and GB 1349-78) have been reviewed. These disadvantages would affect rational utilization .of forest resources, advancement and development of technology in plywood production as well as hinder the guarantee of product quality. In this paper. Some referential comments are offered to revise plywood standards.