Production of glass fibres
First Claim
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1. 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, andtransferring the melt to a fiberizing device and converting the melt into glass fibers by attenuating glass streams leaving the fiberizing device.
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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.
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10 Claims
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1. A process for forming glass fibers comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification