Microwave drying method of wood veneers

Abstract

The invention provides a microwave drying method of wood veneers. The method comprises the stage of preprocessing, wherein the wood veneers to be measured are taken and cut to be of the preset size, the oven dry weight and the wet weight are detected, microwave drying is performed on the preset ventilation condition till the veneers reach the target weight, and the electric energy consumption value of the process is recorded to obtain the water extraction rate of the wood veneers; and the stage of production, wherein the electric quantity needed by microwave drying of the wood is obtained according to the water extraction rate and the wet weight of the wood obtained in the stage of preprocessing, the best drying time is determined according to the operation power of the microwave drying equipment and the electric quantity needed by microwave drying of the wood, and the raw wood materials of the batch are processed by adopting the best drying time. Under the certain ventilation condition, the linear relation between the wood water extraction rate and the microwave electric energy consumption value is built; and the microwave wood drying technology time quantified control is achieved, the microwave drying efficiency is greatly improved, and the drying quality and economic benefits are ensured.

Description

technical field [0001] The invention belongs to the field of wood drying and relates to a microwave drying method for wood veneers. Background technique [0002] Microwave (Microwave) usually refers to electromagnetic waves with a wavelength in the range of 0.1 to 1000mm. The frequency range of microwaves is 300MHz to 3000GMHz, and the frequencies of microwaves used for industrial heating are 915MHz and 2450MHz. [0003] Microwave heats up the dielectric material instantaneously, and the temperature rises quickly. On the other hand, the output power of the microwave can be adjusted at any time, and the temperature rise of the medium can be changed without inertia. There is no "waste heat" phenomenon, and the thermal inertia is small, which is very conducive to the realization of automatic control and continuous production. [0004] Microwaves are a form of energy (not heat), but can be converted to heat in a medium. The reaction of materials to microwaves can be divided in...

AI Technical Summary

Problems solved by technology

[0009] However, due to the high energy consumption of existing wood microwave drying technology, it is difficult to promote on a large scale, especially for the microwave heating time of wood, there is no accurate quantitative method, and it can only be judged based on experience or repeatedly deduced, resulting in heating time much longer than The required heating time is different from the actual heating time and cannot be "quantified", resulting in further increase in production costs and unstable drying quality