Owens-corning Fiberglas Corporation

William H Rigby, Jr

Jerry L Helser

Joseph P Stalego

The water resulting from the filter press molding of slurries of hydrated lime and reactive silica in the manufacture of hydrous calcium silicate products is recycled to the process by treating it with carbon dioxide to precipitate dissolved calcium hydroxide, filtering, and returning the filtered water to the process step wherein the lime and silica are slurried in water.

Water alkalinity control in the manufacture of hydrous silicate products

A process of making a mat of glass fibers wherein a strand of glass fibers frictionally engages the surface of a revolving cylinder from which the strand is tangentially discharged onto a moving conveyor. The strand is caused to be randomly looped upon the conveyor by alternate blasts of air which laterally impinge upon the strand to throw the strand in a looped fashion from side to side across the conveyor. More efficient and sustained operation in the processing of glass fiber mat is obtained by wetting the individual filaments of glass with a water solution comprising organosilane, nonionic lubricants, and acidic salt, which water solution eliminates wheel wrap of the glass fiber strand around the revolving cylinder without adversely affecting other desirable properties of the strand and the mat.

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Newark, OH, United States of America

William H Rigby, Jr