Method for form-pressing wood fibre panels and form pressed pane

Details Method for form-pressing wood fibre panels and form pressed pane Method for form-pressing wood fibre panels and form pressed pane

1990-09-21

1993-02-02

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264119, B29C 4300

Patent

active

051836220

ABSTRACT:
Method for manufacturing form-pressed wood fibre panels, for example door skins, and panels manufactured according to the method. The process starts from a workable, mass produced panel displaying high thermal conductance, for example a so-called MDF-board or chip board. The panel is preheated to a condition where the wood fibres and the binding agent which binds the wood fibres form a pliable or stretchable composition though still in continous panel-like condition. This preheated panel is fed to a form-pressing device where the pressure is relatively slowly increased from 0 to approximately 30 kg/cm.sup.2 during continuing heat supply to a temperature of around 150.degree.-200.degree. C. Usually this is attained in connection with door skins after a period of approximately 1,5 minutes. Finally, a form-stable, form-pressed panel is removed from the press.

REFERENCES:
patent: 2759837 (1956-08-01), Roberts
patent: 3860381 (1975-01-01), Pesch
patent: 3969459 (1976-07-01), Fremont et al.
patent: 4082828 (1978-04-01), Zulli
patent: 4216179 (1980-08-01), Lamberts
patent: 4277428 (1981-07-01), Luck et al.
patent: 4410380 (1983-10-01), Ahrweiler et al.
patent: 4415517 (1983-11-01), Timms
patent: 4844968 (1989-07-01), Persson

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