Adhesive bonding and miscellaneous chemical manufacture – Methods – Plaster board making
Patent
1982-01-18
1983-07-12
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Plaster board making
106114, 264333, 424 94, 4283124, 435275, 536102, B32B 3106, B32B 1308
Patent
active
043928960
ABSTRACT:
A method of producing a gypsum plaster board. This method includes a step of preparing a starch paste which is effective to bond the gypsum core member and both paper boards. In this step, first, about 10-30 wt % of starch such as corn starch based on water is added to water and mixed to obtain milk of starch. Next, about 0.1-1.5 wt % of amylolytic enzyme such as .alpha.-amylase based on the starch is added and then heated to the decomposition point of the starch with stirring. After the heating is stopped at the range of DH 0.1-10, about 0.8-1.0 wt % of an enzyme deactivating agent based on the starch is added and mixed with water to prepare a starch paste. After the starch paste being prepared by the aforementioned process, a raw material of the gypsum core member, that is, calcined gypsum, reinforcing agent such as glass fiber, weight reducing agent such as surface active agent and the starch paste are mixed with water to obtain gypsum slurry. Then, the gypsum slurry is poured between porous sheets such as paper boards. Thereafter, the unset gypsum plaster board is molded to a predetermined thickness by a molding roller and is set by hydration at room temperature. The set gypsum plaster board is cut to a predetermined size by a cutting machine, and it is dried at about 50.degree.-200.degree. C. to evaporate excessive moisture in the gypsum plaster board.
REFERENCES:
patent: 3258407 (1966-06-01), Blanchon
patent: 3516882 (1970-06-01), Cummisford
patent: 4148781 (1979-04-01), Narukawa et al.
Collard Allison C.
Dawson Robert A.
Galgano Thomas
Sakakibara Sangyo Kabushiki Kaisha
Teltscher Erwin S.
LandOfFree
Method of producing a gypsum plaster board does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of producing a gypsum plaster board, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing a gypsum plaster board will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-197206