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Production of glass fibres

  • US 4,054,434 A
  • Filed: 04/29/1976
  • Issued: 10/18/1977
  • Est. Priority Date: 05/15/1975
  • Status: Expired due to Term
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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