Process and apparatus for producing coated single twist glass yarns

A process for producing a single twist coated glass yarn which comprises:

• (a) mechanically drawing a plurality of glass fibers formed from strands of molten glass produced by a spinneret apparatus;
• (b) directing a flow of a dry, inert gas through said fibers as they are formed so as to surround the surface thereof with said gas in an interval between their formation and the coating thereof;
• (c) applying a thermoplastic sizing coating to said fibers directly after said fibers exit said spinneret apparatus so as to at least partially coat only an outer surface thereof, said thermoplastic sizing comprising a non-aqueous composition having a wax base selected from among those waxes which are microcrystalline or amorphous and natural or synthetic together with an optional additive selected from among polyethylenes, polyacrylates, polyamides and polyvinyl acetates and applied as a melt, a suspension or in a solution;
• (d) gathering said coated fibers into a yarn;
• (e) passing said coated yarn through a strap spindle device so as to impart a continuous rotative twisting movement to said yarn;
• and
• (f) cooling said sizing coating subsequent to its deposition upon said fibers so as to cure said sizing by directing a fluid composition upon said coated surface so as to polymerize and/or crosslink said sizing upon said twisted yarn.

A process for producing a single twist coated glass yarn which comprises:

• (a) mechanically drawing a plurality of glass fibers formed from strands of molten glass produced by a spinneret apparatus;
• (b) directing a flow of a dry, inert gas through said fibers as they are formed so as to surround the surface thereof with said gas in an interval between their function and the coating thereof;
• (c) applying a thermosetting sizing coating to said fibers directly after said fibers exit said spinneret apparatus so as to at least partially coat only an outer surface thereof, said thermosetting sizing comprising an aqueous composition having a base formed of an emulsion of at least one polyester resin, wherein said at least one resin comprises a monosaturated organic peroxide emulsion;
• (d) gathering said coated fibers into a yarn;
• (e) passing said coated yarn through a strap spindle device so as to impart a continuous, rotative twisting movement to said yarn;
• and
• (f) heat treating said sizing coating subsequent to its deposition upon said fibers along at least a portion of a path traveled by said coated yarn, so as to cure said thermosetting sizing.

A process for producing a single twist coated glass yarn which comprises:

• (a) mechanically drawing a plurality of glass fibers formed from strands of molten glass produced by a spinneret apparatus;
• (b) directing a flow of a dry inert gas through said fibers as they are formed so as to surround the surface thereof with said gas in an interval between their formation and the coating thereof;
• (c) applying a photosetting sizing coating to said fibers directly after said fibers exit said spinneret apparatus so as to at least partially coat only an outer surface thereof said photosetting sizing comprising at least one photoinitiator compound and at least one compound selected from among monsaturated oligomers, polyunsaturated oligomers, monounsaturated monomers and polyunsaturated monomers and optionally at least one additive composition comprising an organic solvent;
• (d) gathering said coated fibers into a yarn;
• (e) passing said coated yarn through a strap spindle device so as to impart a continuous rotative twisting movement to said yarn;
• and
• (f) irradiating said photosetting sizing coating subsequent to its deposition upon said fibers with a source of actinic radiation in order to polymerize and/or crosslink said sizing upon said yarn.