Process for improving wood strength through microwave pretreatment

Abstract

The invention relates to the technical field of wood processing, and discloses a technology for improving wood strength through microwave pretreatment, through wood testing, moisture content testing, wood microwave treatment, wood performance testing and wood forming confirmation, and through the nuclear magnetic resonance low-temperature freeze thawing technology, water in wood cell cavities is frozen, the cell cavity diameter is increased, and the wood strength is improved. The moisture transfer path is expanded, moisture is easy to move outwards, the wood drying speed is increased, the permeability of the wood can be improved through microwave pretreatment, the migration speed of moisture in the wood is increased, and therefore the evaporation surface can be kept near the surface of the wood for a long time, the moisture content gradient on the thickness is reduced, and the wood drying quality is improved. And finally, the residual stress index after drying is reduced, favorable conditions are provided for later-stage drying and impregnation treatment of the wood, meanwhile, the surface strength, static bending strength and bending strength of the wood subjected to microwave treatment are greatly improved, and therefore the preceding degree and the practical quality of the poplar wood are effectively improved.

Description

technical field [0001] The invention relates to the technical field of wood processing, in particular to a technology for improving the strength of wood by microwave pretreatment. Background technique [0002] As one of the four traditional materials, wood has incomparable advantages over other materials. It is not only a green, recyclable and renewable biomass material, but also an important resource to ensure the development of the national economy. As the world's second largest wood consumer and largest wood importer, China's total wood consumption has increased by 173% in the past 10 years. In 2020, the demand for wood in my country is expected to exceed 800 million cubic meters, and the external dependence of wood exceeds 60%. Especially, the large-diameter high-quality natural forest wood can only be imported, and the wood safety situation is very serious. Contrary to the extreme scarcity of natural forest resources, my country's plantation forest wood resources are v...

AI Technical Summary

Problems solved by technology

Aiming at the deficiencies of the prior art, the present invention provides a process for microwave pretreatment to improve wood strength, which solves the problem