Patent ID: 7919028
Filing Date: 2011-04-05
Classification: A01D,B29C,D01D,D02G,Y10T

Abstract:
1. A process for forming a flexible noise attenuating cutting line for use in rotary vegetation trimmers comprising the steps of extruding a molten strand of monofilament through a die having an oblately-shaped die hole therein, rotating said die during said extruding step to twist the strand about a central axis so as to form a twisted length of molten monofilament oblately-shaped in cross section, directing said twisted length of molten monofilament into a cooling quench bath and pulling said twisted length through the bath to effect crystallization thereof whereby a flexible noise attenuating monofilament cutting line is formed having a slightly out-of-round cross-section and being twisted about and along its entire length.