Method for forming ceiling tile

Details Method for forming ceiling tile Method for forming ceiling tile

1989-10-02

1991-12-31

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With reshaping or surface embossing of formed article

162226, 162227, 264118, 264120, 264145, 264160, 264162, 264163, 2642977, 264DIG31, 425219, 425220, B28B 504, B28B 1114, B29C 5900, D21J 300

Patent

active

050769855

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.

REFERENCES:
patent: 943971 (1909-12-01), Hackett
patent: 1206553 (1916-11-01), Lewis
patent: 1780623 (1930-11-01), Loetscher
patent: 2737997 (1956-03-01), Himmelheber et al.
patent: 2744848 (1956-05-01), Mottett
patent: 3246063 (1966-04-01), Podgurski
patent: 4105383 (1978-08-01), Hanson
patent: 4469656 (1984-09-01), Ishii
patent: 4666648 (1987-05-01), Brittain
patent: 4675144 (1987-06-01), Hammond
patent: 4758148 (1988-07-01), Jidell

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