Method of wet-forming mineral fiberboard product having damage-r

Details Method of wet-forming mineral fiberboard product having damage-r Method of wet-forming mineral fiberboard product having damage-r

1973-04-02

1979-05-08

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

162128, 162129, 162145, 162181R, 162181C, 162181D, 162206, 162225, 428308, D21F 1100

Patent

active

041535030

ABSTRACT:
A mineral board product is formed having a low density backing layer and a high density damage-resistant surface layer on conventional fourdrinier equipment in a continuous wet-laid process by initially forming a low density water-laid sheet by flowing a slurry of the board-forming materials onto the wire of a fourdrinier and, at that point on the wire where the mat has formed but at which the water content is between about 7.0 and 12.0 percent, a surfacing layer is applied by means of a secondary head box to the mat, the slurry forming said surfacing layer having a slurry consistency of between about 10 and 15 percent and a Canadian Standard Freeness of between about 150 and 300.

REFERENCES:
patent: 2108761 (1938-02-01), Becker
patent: 2634207 (1953-04-01), Miscall et al.
patent: 3373074 (1968-03-01), D'Eustachio et al.

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