Technological method for removing formaldehyde in board through microwave exciting and vacuum drawing

Abstract

The invention provides a technological method for removing formaldehyde in a board through microwave exciting and vacuum drawing, and relates to a technological method for removing formaldehyde in the board. The technological method comprises the following processes: arranging the board without being subjected to surface coating and side sealing treatment on a shelf in a vacuum bin which is provided with a microwave transmission source, and then starting microwave radiation; maintaining the vacuum degree of the vacuum bin to be 400 Pa, and lasting for 15 minutes; repeating step C until the total drawing time reaches 5 hours; exhausting gas from the vacuum bin; moving out the board; and performing surface coating treatment. According to the method, the microwave radiation is adopted, so that the energy can be quickly transmitted into the board; the microwave radiation energy is equal to the hydrogen bond energy, so that hydrogen bonds can be effectively broken, and as a result, formaldehyde can be removed; the extreme vacuum degree of a production device is required a little; the processes are short; the intensity of the board is not broken. Therefore, the technological method is a practical technological method.

Description

technical field [0001] The invention relates to a process method for removing formaldehyde in a plate, in particular to a process method for removing formaldehyde in a plate through microwave excitation and vacuum extraction. Background technique [0002] Due to people's practical and aesthetic needs for interior decoration, panels are widely used in decoration and furniture manufacturing. Man-made composite boards ("boards" for short) made of fragmentary wood materials can not only reduce tree felling and protect the ecological environment, but also are obviously superior to other countries in terms of anti-deformation, anti-cracking, waterproof, anti-corrosion, good decoration and low price. Solid wood material. However, these boards are mostly made of wood chips, wood particles, wood fibers or veneers and chemical adhesives. After the adhesive is used, excess free formaldehyde remains in the board. Free formaldehyde gradually volatilizes during the use of the board, th...

AI Technical Summary

Problems solved by technology

[0004] 1. The energy cannot be quickly transferred to the interior of the plate;

[0005] 2. Provide energy for the whole plate, not for formaldehyde molecules, which wastes energy;

[0006] 3. The energy does not match the hydrogen bond energy, and cannot effectively destroy the hydrogen bond, thereby promoting the desorption of formaldehyde;

[0007] 4. In order to promote the desorption of formaldehyde, the ultimate pressure of vacuum extraction has to be minimized, which wastes energy and requires high production equipment, long process flow, and may damage the strength of the plate, so it is not suitable as a practical process