Plastic article or earthenware shaping or treating: apparatus – With separate apparatus cleaning means – Coacting with forming means or dough divider type trap chamber
Patent
1987-11-13
1989-02-07
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
With separate apparatus cleaning means
Coacting with forming means or dough divider type trap chamber
425371, 4254051, B29C 4322
Patent
active
048028371
ABSTRACT:
Apparatus for forming particle board and having plural opposed continuous belts and means to introduce a hardener in fluid form in the nip between the belts. The production of wood material particles into board or panels, such as chipboard, fiber board, OSB panels, MDF panels and the like, involves coating the particles with a binder free of any hardener. The coated particles are deposited on a support surface in the form of a mat and then are compressed. While the particles are being compressed in a press, an acid or basic hardener in a gaseous phase or in a binary phase with a gaseous carrier agent, is introduced across and into the surface of the mat or directly into the interior mat. The compression of the mat can be performed either in a continuous double band press or a discontinuous single or multi-platen press. In a double band press, two press bands are arranged in opposed relation and the hardener is introduced into the mat in a wedge-shaped inlet zone between the press bands. The hardener flows through openings in the press band onto the surface of the mat. Conduits are located in pressure plates associated with the press and bores extend from the conduits to the pressure plate surfaces in contact with the mat.
REFERENCES:
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patent: 3313010 (1967-04-01), Betz
patent: 3325859 (1967-06-01), Goldstein
patent: 3586573 (1971-06-01), Vissers
patent: 4263007 (1981-04-01), Battigelli et al.
patent: 4710333 (1987-12-01), Murakami
patent: 4718843 (1988-01-01), Carlsson et al.
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