A control method for density peak shape of unilaterally compressed wood

Abstract

The invention belongs to the technical field of wood product production processes, and discloses a control method of a single-side compressed wood density peak shape. The control method comprises thefollowing steps: S1, wood is placed into a hot-pressing plate, and the moisture migration rate of the surface of the wood is controlled; S2, a softening layer is controlled; S3, hot-pressing control is carried out; S4, plasticizing and shaping control is carried out; S5 pressure relief is carried out. In the S2, the position and the thickness of the softening layer are accurately controlled according to the temperature of the glass conversion point of the softening layer; in the S3, according to the density peak shape, a single-stage hot-pressing or multi-stage hot-pressing mode is adopted, and the pressure is 3-12 MPa; in the S4, heat preservation, pressure maintaining, plastifying and low-temperature low-pressure setting are formed; and in the S5, pressure relief of a press machine is carried out, the pressing plate is opened, the wood is taken out, and the single-side compressed wood with the specific density peak shape is obtained. The control of the single-side compressed wood density peak shape is realized through the control method, the operation is simple and convenient, the implementation process is controllable, and the method has the advantages of being efficient and thelike; and the mechanical property of the single-side compressed wood is different from the shape of the density peak, and can be widely applied to the fields of solid wood floors, solid wood furniture, solid wood cabinet bodies and the like.

Description

technical field [0001] The invention belongs to the technical field of wood product production technology, and more specifically relates to a method for controlling the density peak shape of unilaterally compressed wood. Background technique [0002] At present, my country has completely stopped commercial logging of natural forests, and the timber structure has gradually changed from natural forests to fast-growing plantations. However, fast-growing plantation wood has low density, low mechanical properties, and poor stability. It is mainly used in plywood, pulp and paper, and logistics packaging, and the degree of solid wood utilization is not high. Improving the function of plantation timber, broadening the application field of plantation timber and improving its utilization rate of wood is the fundamental way to solve the shortage of high-quality timber in China, and it is also the only way to promote the development of circular economy in forestry. [0003] The mechani...

AI Technical Summary

Problems solved by technology

The above-mentioned patent adopts the hot pressing method to prepare the surface compressed material. In order to control the thickness of the dense layer of the surface compressed material, the end-sealing treatment and water immersion treatment are used in the early stage of hot pressing to control the moisture content gradient in the thickness direction of the plate, and to realize the control of the softened layer under preheating conditions. , under this process condition, the moisture migration rate of the surface layer cannot be precisely controlled, the position and thickness of the softened layer are uncertain, and the realization process of the target density peak shape is not easy to accurately control, resulting in low pass rate and high production cost

In the existing literature research, the single-sided compressed wood density peak type of wood is single, and the peak shape of the dense layer cannot be controlled according to the application requirements to obtain optimized application effects.

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