Pressboard and process for its preparation

Details Pressboard and process for its preparation Pressboard and process for its preparation

1986-07-22

1988-06-21

Chin, Peter

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

162129, 162130, 162132, 162138, 162146, 1621573, 162206, D21H 520

Patent

active

047523557

ABSTRACT:
High temperature resistant pressboard having a desirable combination of compression set values and oil absorption is prepared by a process whereby a low density pressboard is first prepared by forming a wet lap of multiple layers of a waterleaf containing 50-95% by weight water and pressing the wet lap at 100-200.degree. C. under a pressure of 10-60 kg/cm.sup.2, drying, ultimately at 270.degree.-320.degree. C. until substantially no further moisture is evolved and finally pressing at 270.degree.-320.degree. C. under a pressure of 8-350 kg/cm.sup.2 and optionally cooling under restraint.

REFERENCES:
patent: 3756908 (1973-09-01), Gross
patent: 4060451 (1977-11-01), Uchiyama et al.

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