Richard C Cunningham

US Patent:

50769855, Dec 31, 1991

Filed:

Oct 2, 1989

Appl. No.:

7/415584

Inventors:

John D. Koch - Greenwood IN
Mark R. Glassley - Greensburg IN
Richard N. Cunningham - Greenwood IN

Assignee:

Knauf Fiber Glass, GmbH - Shelbeyville IN

International Classification:

B28B 504
B28B 1114
B29C 5900
D21J 300

US Classification:

264119

Abstract:

A process for consistently making ceiling tiles having uniform density and surface texture includes using a conveyor along which trays are moved in a generally horizontal direction. A feeder box is used to deposit pulp in the trays, the pulp being comprised of a mixture of water, starch, fibrous material, and other ingredients. The feeder box through which pulp is deposited in the trays is of a special design, and includes a sloping front edge which creates a negative rake angle with respect to layers produced by the system. The lower front edge of the feeder box includes a surface having a compound curvature. Ceiling tiles are produced by the process having improved uniformity of density and surface texture.

US Patent:

51942062, Mar 16, 1993

Filed:

Oct 2, 1989

Appl. No.:

7/415588

Inventors:

John D. Koch - Greenwood IN
Mark R. Glassley - Greensburg IN
Richard N. Cunningham - Greenwood IN
C. F. Owen - Meadowview IN

Assignee:

Knauf Fiber Glass, GmbH - Shelbeyville IN

International Classification:

B27N 318
B28B 504
B29C 4306
D21B 104

US Classification:

264115

Abstract:

A process for using shredded scrap or virgin fiber glass in combination with starch, water and other components to make ceiling tiles. The tiles are made by initially preparing a mixture of water, starch, boric acid and fire clay. That initial mixture is then heated to form a gel. Fiber glass is then added to the gel to form a pulp. The pulp is fed into trays to form slabs. The slabs are dried and finished into tiles.