Tabular acicular gypsum and method of filling paper

Details Tabular acicular gypsum and method of filling paper Tabular acicular gypsum and method of filling paper

1987-01-16

1989-01-31

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

D21H 378

Patent

active

048013552

ABSTRACT:
A tabular variety of acicular gypsum crystal filler is prepared by hydrating calcium sulfate dihydrate particles in a seeded continuously stirred reactor at a low level of super-saturation to obtain crystals having an aspect ratio of about 100:10:1 and average length in the longest dimension of about 100-450 micrometers. For the manufacture of paper, the obtained tabular crystal slurry may be directly added to the paper pulp before web formation to obtain a filled paper having high filler retention.

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