Abstract:
Hard stretch filaments and films produced by extruding a heat softened or molten polymer of alkylene sulfide, such as polyethylene sulfide, having an inherent viscosity of about 0.5 or greater, through a shaping orifice to form the filament or film and taking up the product at a linear rate of from 20 to 3,000 meters per minute at a drawdown ratio of from 100:1 to 4000:1. A filament which spontaneously develops helical crimps along its length produced when a drawdown ratio greater than 1200:1 is used. Open-celled filaments or films produced from the hard stretch filaments and films by stretching the filaments or films in a range of from about 50 percent of the unstretched length up to about 90 percent of the breaking elongation and stabilized by heating the filament or film while in the stretched state to a temperature in the range from about 80*C. to a temperature below the melting point of the polymer.
Abstract:
IMPROVED FILAMENTSOF 3-METHYLBUTENE-1, PARTICULARLY WITH RESPECT TO TENSILE PROPERTIES AT ELEVATED TEMPERATURES, MAY BE PREPARED BY HEAT TREATING POLYMERIC 3-METHYLBUTENE-1 PRIOR TO EXTRUSION AT A TEMPERATURE ABOVE ITS MELTING POINT TO INCREASE THE MELT INDEX ABOVE 10 AND THEN MELT SPINNING THE HEATED POLYMER THROUGH AT LEAST A 14 MIL DIAMETER SPINNERETTE AND DRAWING DOWN THE RESULTANT FILAMENT AT A RATIO OF AT LEAST ABOUT 150.
Abstract:
Apparatus for producing a crimpable filament from a homogeneous polymer composition supply comprising means to divide the polymer supply into separate flow paths, means to subject each flow path to different environments and means to recombine the flow paths and extrude a two-component filament.