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US 5,194,206 AGranted
Process for the manufacture of ceiling tile
AssigneeKnauf Fiber Glass GmbH
InventorsJohn D. Koch, Mark R. Glassley, Richard N. Cunningham, C. F. Owen
Life of this patent
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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.
Claims6
A process for manufacturing ceiling tiles comprising the steps of:
- preparing a mixture which includes water, starch, boric acid and fire clay,
- heating said mixture to form a gel,
- shredding scrap fiber glass prior to its addition to said gel to form shredded fiber glass,
- adding fibrous material comprising said shredded fiber glass to said gel to form a pulp,
- wherein said pulp comprises the following components:
- ______________________________________ COMPONENT PER CENT BY WEIGHT ______________________________________ Water about 80 to about 85 Starch about 2 to about 5 Boric Acid about 0.15 to about 0.35 Fire Clay about 0.7 to about 0.95 Planer Dust about 0 to about 8 Silicone Emulsion about 0 to about 0.1 Scrap Fiber glass about 5 to about 15 ______________________________________
- feeding said pulp into trays to form slabs,
- drying said slabs in an oven to form dried slabs in accordance with a temperature schedule as follows:
- a. raise to about 250.degree. F. in about 1/2 hour
- b. hold at about 250.degree. F. for about 2 hours
- c. hold at about 275.degree. F. in about 1/2 hour
- d. hold at about 375.degree. F. for about 4 hours
- e. reduce to about 350.degree. F. and hold for about 2 hours
- f. reduce to about 325.degree. F. and hold for about 2 hours
- g. reduce to about 300.degree. F. and hold for about 2 hours
- h. reduce to about 250.degree. F. and hold for about 3 hours, and
- finishing said dried slabs to form said ceiling tiles.
14 more elements
Dependencies are inferred from the claim text.