Plasterboard manufacture

Details Plasterboard manufacture Plasterboard manufacture

1975-06-13

1977-12-20

Van Horn, Charles E.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Plaster board making

156 90, 427326, B32B 3112, B32B 1308

Patent

active

040639762

ABSTRACT:
Satisfactory or enhanced dry bond between the gypsum core of plasterboard and paper facing sheets is achieved by treatment of at least the inner faces of the paper sheets with a water soluble zirconium salt before contacting the sheets with a core slurry containing gypsum plaster and starch as a dry bond assistant. The preferred zirconium salt is zirconium acetate although other salts such as oxychloride, nitrate and sulphate can also be used. The preferred level of zirconium is from 1 to 2 g. per square meter of paper, expressed as zirconium dioxide, and excellent dry bonds are formed with as little as 0.2% starch by weight of core solids, which represents an important economy in the use of starch.

REFERENCES:
patent: 3137588 (1964-06-01), Taylor
patent: 3307987 (1967-03-01), Bieri
patent: 3389042 (1968-06-01), Bieri et al.
patent: 3425896 (1969-02-01), Hart
May, Michael, Water Repellent Finishes, in American Dyestuff Reporter, vol. 58, pp. 15-19, 45, Oct. 6, 1969.

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