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US 4,145,202 AGranted
Method for reprocessing glass fibers
AssigneePPG Industries, Inc.
InventorsMartin A. Grodin, Herbert W. Barch, Frank E. Harvey, Patrick C. Chardello
Life of this patent
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AssigneePPG Industries, Inc.
InventorsMartin A. Grodin, Herbert W. Barch, Frank E. Harvey, Patrick C. Chardello
Estimating the term…
A method is disclosed for processing waste glass strands and/or fibrous filaments which are produced in the course of operating a glass fiber forming plant for subsequent reuse as batch ingredients for a glass fiber forming process. The method described involves controlled thermal treatment of the waste glass strands and/or filaments to produce particulate glass which can be recycled to a fiber glass forming furnace. The reprocessing of waste glass strands and/or filaments reduces substantially the raw material cost involved in feeding glass batch ingredients to a glass fiber forming operation. Apparatus for accomplishing the reprocessing of the waste glass filaments and/or strands in accordance with the method disclosed is also described.
A method of treating waste glass filaments and/or strands having organic coatings present thereon comprising heating the glass filaments and/or strands in a controlled thermal environment wherein the filaments and/or strands are heated to a first thermal treatment temperature for a sufficient period of time to remove substantially all the moisture therefrom, raising the temperature of the filaments and/or strands after the moisture has been removed to a second thermal treatment temperature sufficient to volatilize the organic components of coatings present, then raising the temperature of the filaments and/or strands to a final thermal treatment temperature sufficient to incinerate any residual material on the surface thereof while maintaining the filaments and/or strands at temperatures below the softening point thereof and collecting the resulting filaments and/or strands.
Dependencies are inferred from the claim text.