Title:
【発明の名称】複合ボードの製造法
Document Type and Number:
Japanese Patent JP3376429
Kind Code:
B2
Abstract:
An improved composite material is produced by mixing ground gypsum and a plurality of host particles, each having accessible voids therein, together with sufficient liquid to form a dilute slurry; heating the slurry under pressure to a temperature sufficient to calcine the gypsum to calcium sulphate hemihydrate; allowing the calcium sulphate molecules to nucleate and form crystals in-situ in and about the voids in the host particles; dewatering the hot slurry; and drying the dewatered solids to remove substantially all the remaining free water and stabilize the calcium sulphate crystals while still physically interlocked with the host particles. According to a further aspect of the invention, an improved wallboard comprising a plurality of host cellulosic particles each having accessible voids in its body; and calcium sulphate crystals, at least some of which are formed in-situ in and about a significant portion of the accessible voids in the host particles, whereby the host cellulosic particles are physically interlocked with the calcium sulphate crystals.
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Inventors:
Bague, Martha A.
Application Number:
JP50184290A
Publication Date:
February 10, 2003
Filing Date:
November 07, 1989
Export Citation:
Assignee:
United States Gypsum Company
International Classes:
B28B3/02; B32B13/10; B32B21/00; C04B11/00; C04B16/02; C04B11/024; C04B28/14; C04B11/02; C04B111/20; (IPC1-7): C04B28/14; B28B3/02; C04B11/00; C04B16/02
Domestic Patent References:
| JP5325339B2 | ||||
| JP5546987B2 |
Attorney, Agent or Firm:
Akiyuki Matsumoto