Method of making wet-pressed fiberboard of high resistance to be

Details Method of making wet-pressed fiberboard of high resistance to be Method of making wet-pressed fiberboard of high resistance to be

1975-05-20

1977-06-28

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Non-fiber additive

162165, 162185, 162215, 162225, 162336, D21H 336, D21H 502

Patent

active

040323943

ABSTRACT:
Wet pressed fiber board material of high resistance to bending is produced by preparing a layer of fiber from a water suspension of the fiber, said layer being de-watered and pressed to form a coherent flat sheet, wherein raw material is distributed over the surface of said layer in varying quantities and/or qualities in a manner such that the pressed board obtains strip-like surface portions which extend in at least one direction of the horizontal plane of the sheet, said strip-like surface portions having varying density and/or strength properties, whereby the finished board has a higher resistance to bending than a homogeneous sheet having substantially the same average density.

REFERENCES:
patent: 1687140 (1928-10-01), Pleyer
patent: 1780623 (1930-11-01), Loetscher
patent: 1821209 (1931-09-01), Darrah
patent: 3243340 (1966-03-01), Cadotte
patent: 3391233 (1968-07-01), Polovtseff
patent: 3493463 (1970-02-01), Baker
patent: 3665065 (1972-05-01), Hass et al.
patent: 3969561 (1976-07-01), Marshall

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