Pressboard and process for its production

Details Pressboard and process for its production Pressboard and process for its production

1990-09-25

1991-12-31

Chin, Peter

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

162146, 1621573, 162206, D21H 1326

Patent

active

050768875

ABSTRACT:
High temperature resistant pressboard having a density of 0.70 to 0.90 g/cc, a calculated void volume of 31 to 49, percent by volume of said pressboard and a smoothness of 80 to 250 microinches MD range and 90 to 260 microinches is disclosed. The pressboard is prepared by wet laying an aqueous dispersion of polyaramid fibrids and floc to form a waterleaf building up layers to form a wet lap which is dried and then pressed at 270.degree. C. to 520.degree. C. rising a press with a predetermined minimum opening to form the desired smooth low density pressboard.

REFERENCES:
patent: 4752355 (1988-06-01), Provost
patent: 4888091 (1989-12-01), Nollen

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