Back to results
US 4,054,434 AGranted
Production of glass fibres
AssigneeFibreglass Limited
InventorsJohn Stuart Thomas, Allan Frank Mason
Life of this patent
Estimating the term…
Abstract
The disclosed invention pertains to a process for melting glass in which scrap glass fibers containing carbonaceous material to provide a carbon content of 0.4%-0.04% in a batch is combined with batch materials in which the scrap amounts to 5%-25% by the weight of the batch. The batch is melted under oxidizing conditions and the resultant melt is used to form glass fibers.
Claims10
A process for forming glass fibers comprising:
- collecting scrap glass fiber material derived from at least one glass fiberizing process, said glass fiber material containing on its surface a proportion of non-mineral, carbonaceous material;
- reducing the scrap glass fiber material to a finely divided, milled form;
- preparing a batch of glass fiber forming material by mixing between 5% and 25% by weight of said finely divided scrap with new material;
- said proportion of non-mineral, carbonaceous material on said scrap glass fiber being sufficient to provide a carbon content of 0.4% to 0.05% in said batch;
- feeding the batch so formed to a glass melting tank and converting the batch to a glass melt;
- maintaining oxidizing conditions within the glass melt during the melting operation, and
- transferring the melt to a fiberizing device and converting the melt into glass fibers by attenuating glass streams leaving the fiberizing device.
4 more elements
Dependencies are inferred from the claim text.