Hot pressing process for environmental-protection oriented particle boards

Abstract

The invention provides a hot pressing process for environmental-protection oriented particle boards. The hot pressing process comprises the steps of prepressing, water spraying, roller coating of demolding agents and hot pressing; in hot pressing, the speed of a press is 250-350 mm / s; the temperatures of pressing plates of the press are 240-245 DEG C, 230-240 DEG C, 215-225 DEG C, 175-185 DEG C and 155-165 DEG C; in prepressing, the pressure is 1.5 MPa; in water spraying, the water spraying quantity is 30-40 g / m2; after water spraying, the water content of surface layers of slabs is 8-12%, thewater content of core layers of slabs is 4-5%, and the water content of fine material layers of slabs is 12-18%; and in roller coating of the demolding agents, the spraying quantity of the demoldingagents is 15-20 g / m2. The hot pressing process improves the spraying uniformity, saves the use level of the demolding agents, and achieves higher environmental protection; the thickness deviation of aplain plates obtained by hot pressing is low; and the deviation is within -0.3-0 mm.

Description

technical field [0001] The invention belongs to the technical field of plate manufacturing, and relates to a hot-pressing process, in particular to a hot-pressing process for an environment-friendly oriented particle board. Background technique [0002] With the recovery of the economy in Asia, the consumption of wood products is on the rise. The development of western China, the rise of urban agglomerations in the Central Plains, the promotion of small town construction in coastal provinces of China, the implementation of the Three Gorges Project and the South-to-North Water Diversion, and the expansion of higher education , a large number of agricultural population will be stationed in cities and towns, the construction industry will develop extremely fast, and the consumption of wood products such as furniture and floors will rise rapidly. In particular, the development of China's rural economy and the increasing affluence of farmers have also led to a linear increase in ...

AI Technical Summary

Problems solved by technology

[0005] (1) In the existing hot-pressing process, the slab is easy to stick to the steel belt during hot-pressing, resulting in downtime for maintenance, low speed of the press, and reduced yield of slabs;

[0006] (2) The quality of oriented strand board prepared by the existing hot pressing process is unstable, prone to bubbling and delamination, and the scrap rate is high;

[0007] (3) The oriented strand board prepared by the existing hot pressing process has a high formaldehyde content

Images