Fiberboard manufacture

Details Fiberboard manufacture Fiberboard manufacture

1973-07-18

1976-07-13

Ziegler, J.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

260 172, 260 173, 264128, B29J 502, B29J 508

Patent

active

039694593

ABSTRACT:
This invention relates to an improved process and apparatus system for the continuous production of thin fiberboard products wherein a binder-impregnated wood fiber mat is continuously formed and then continuously and successively passed through a conditioning zone where the mat temperature is adjusted to about the glass transition temperature of the ligneous hemicellulosic matrix material of the wood fiber at a moisture content from about 6% to 12% by weight, prepressed to reduce the bulk thereof and substantially eliminate entrained air therefrom, hot pressed at a temperature and for a time sufficient to reduce the mat to the final thickness desired and to initiate but not to complete cure of the binder, and thereafter subjected to a temperature sufficient, but not above about 350.degree.F., and for a time sufficient to complete binder cure and mat consolidation.

REFERENCES:
patent: 2864715 (1958-12-01), Glab
patent: 2872330 (1959-02-01), Glab
patent: 3230287 (1966-01-01), Caron et al.
patent: 3267188 (1966-08-01), Bassett et al.
patent: 3493527 (1970-02-01), Schueler

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