Patent ID: 6035667
Filing Date: 2000-03-14
Classification: B65H,C03B,D10B,Y02P

Abstract:
A method of manufacturing a glass yarn in a non-twisted state comprising the steps of:forming a multiplicity of glass filaments a diameter of which is 9.5.mu. or less by drawing molten glass flowing out through a multiplicity of orifices formed in a bottom portion of a bushing while applying a tension to said multiplicity of filaments;forming a single strand of glass yarn having said tension by applying a sizing agent to said multiplicity of glass filaments and gathering said multiplicity of glass filaments by a gathering device;reducing the tension of said strand; andwinding said strand at a predetermined winding speed to form one square-end package of said glass yarn;wherein said strand tension reducing step is effected throughout said winding step, said strand tension reducing step including bringing said strand into contact with a peripheral surface of each of three positively driven drums, said three drums each being rotated at a peripheral speed that is faster than said winding speed, said three positively driven drums are rotated simultaneously and are disposed in closely spaced fashion, an uppermost drum and a lowermost drum of said three drums being disposed at fixed positions and a middle drum of said three drums being movable transversely with respect to the uppermost and lowermost drums so as to adjust the tension of said strand, and said uppermost drum and said lowermost drum are rotated in the same direction, said middle drum being rotated in an opposite direction with respect to the direction of rotation of said uppermost and lowermost drums.