Technology for die releasing of MDI artificial board through special paper

Abstract

The invention provides a technology for die releasing of an MDI artificial board through special paper. The technology is characterized in that before a hot-pressing procedure is conducted, the special paper is laid between a hot-pressed board and an MDI artificial board blank, then the MDI artificial board blank is conveyed into a hot press, under the conditions that the hot-pressing temperatureis 150-220 DEG and the pressure is 2400-3800 kN / m<2>, after curing and releasing are conducted through the hot press, die releasing is conducted, and the special paper is hot-pressed and cured into arough board together with the MDI artificial board blank. The problem of die sticking of the MDI glue artificial board is solved.

Description

technical field [0001] The invention relates to a demoulding process of a wood-based panel, in particular to a process for demoulding an MDI wood-based panel by using special paper. Background technique [0002] Adhesives used in straw wood-based panels are generally urea-formaldehyde resin adhesives and phenolic resin adhesives. Wood-based panels using these adhesives will release formaldehyde during manufacture and use, which will affect people's health. Therefore, more and more people begin to study formaldehyde-free wood-based panels, among which, the use of MDI glue in formaldehyde-free wood-based panels to replace traditional aldehyde-containing adhesives has been favored by people. However, this MDI glue makes it difficult for the wood-based panel to be released from the hot-pressed plate. In order to improve this situation, the methods commonly used at present are: (1) Use a release agent in the raw material of the panel, but production practice has proved that this ...

AI Technical Summary

Problems solved by technology

However, this MDI glue makes it difficult for the wood-based panel to be released from the hot-pressed plate. In order to improve this situation, the methods commonly used at present are: (1) Use a release agent in the raw material of the panel, but production practice has proved that this This method cannot completely solve the problem of smooth separation of wood-based panels and molds, and sometimes the phenomenon of mold sticking occurs, which affects the yield

(2) Spread sanding powder on the surface of molds such as lining boards and hot-pressing plates, but sanding powder may be mixed with raw materials to form a slab, and it is not easy to remove even in the subsequent sanding process, resulting in the appearance quality of the formed slab bad

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