Method for manufacturing fast-growing poplar technical wood sawn timber at low temperature

Abstract

The invention provides a method for manufacturing a fast-growing poplar technical wood sawn timber at low temperature or normal temperature and aims to solve the problem of cracking of fast-growing poplar technical wood which is produced at low temperature (the ambient temperature is below 5 DEG C). The indexes of the dipping delaminating ratio, water-absorbing thickness expansion ratio, static bending strength and modulus of elasticity of the fast-growing poplar technical wood sawn timber which is produced by the method meet or exceed requirements of standard LY / T1655-2006 Reconstituted Decorative Lumber. The method comprises the steps of preparing a poplar single board, dyeing the single board, drying the single board, gluing the single board, assembling and cold-pressing, and fixing laminated battens of the single board obtained by cold-pressing into the die, maintaining, removing the die and lumbering. The formula of an adhesive which is used for gluing the single board is that: the mass ratio of urea-formaldehyde glue to polyvinyl acetate is (7-9):1; a curing agent which is 1 to 4 mass percent of the adhesive is added; during the cold-pressing, pressure is 1 to 2 MPa, and cold-pressing time is 0.5 to 1.5 hours; and during the maintenance, the temperature of a maintenance room is 35 to 45 DEG C, relative humidity is 65 to 75 percent, and maintenance time is 90 to 100 hours.

Description

technical field [0001] The invention relates to a method for making fast-growing poplar high-tech wood sawn timber, in particular, it is a method suitable for making fast-growing poplar high-tech wood with modified urea-formaldehyde glue under low temperature conditions (0-5°C). Background technique [0002] Jiangsu Province is the central production area of ​​southern type poplar, and its stock volume and annual cutting volume both rank first in my country. In recent years, a new poplar processing industry belt has formed in northern Jiangsu. However, with the development of the economy and the improvement of human living standards, forest resources have decreased sharply, and environmental pollution has become more and more serious. Under the impact of the world's environmental protection tide, technological wood came into being. This is a kind of cheap artificial forest or ordinary tree species wood rotary cut or sliced ​​veneer as the main raw material, which is manufac...

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Problems solved by technology

[0011] The present invention aims at the cracking problem of the fast-growing poplar technology wood produced under low-temperature weather conditions (environmental temperature is lower than 5°C), and provides a method suitable for producing fast-growing poplar technology wood sawn timber under low-temperature weather conditions (of course, this method It can also be applied at normal temperature), and the impregnation peeling rate, water absorption thickness expansion rate, static bending strength, elastic modulus and other indicators of the fast-growing poplar technology wood sawn timber produced by this method have reached or exceeded the standard LY / T 1655-2006 "Recombined "Decorative Materials" Requirements

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