PVC fibers and method of manufacture
Improved PVC filaments for use as wig material for toy dolls are described. PVC resin may be mixed with a stabilizing agent, lubricants, and a processing aid and pounded into PVC resin pellets. The PVC resin pellets may be subsequently spun or extruded in a conventional spin-draw machine. Undrawn PVC filaments are oil-coated and drawn at differential temperatures on a plurality of roller sets prior to heat-setting and being wound on a take-up unit.
1 . A method for producing PVC filaments comprising:
preparing PVC pellets from a PVC composition comprising a PVC resin, a stabilizing agent, a lubricant, and a processing aid;
spinning the PVC pellets in a spin-draw machine; and
extruding the spun PVC pellets to form filaments; and
oil-treating the filaments with a cross-linked silicone oil comprising an OH-terminated polydimethyl siloxane, amino-modified polydimethyl siloxane, and an epoxy silicone.
2 . A method for producing PVC filaments according to claim 1 , wherein the PVC pellets are comprised of a PVC resin of 100 parts by weight, a stabilizing agent of 1 to 5 parts by weight, a lubricant of 0.3 to 3.0 parts by weight, and a processing aid of 0.1 to 3.0 parts by weight.
3 . A method for producing PVC filaments according to claim 1 , wherein the spin-draw machine is equipped with three roller sets for drawing and a take-up unit, and the filaments being first drawn between the first roller set and the second roller set, second drawn between the second roller set and the third roller set, heat-set on the third roller set, and wound up on the take-up unit.
4 . A method for producing PVC filaments according to claim 3 , wherein the draw ratio at the spin-draw machine is preferably in the range of 1.8 to 2.5, and the temperature for drawing at the second roller sets is about 60 to 120 degrees Celsius, and the heat set temperature at the third roller set is preferably in the range of 100 to 180 degrees Celsius.
5 . PVC filaments which are prepared by a process in accordance with claim 1 .
6 . PVC filaments which are prepared by a process in accordance with claim 4 .
7 . A PVC filament for use as doll hair comprising an extruded PVC homopolymer that is treated with a cross-linked silicone oil.
8 . A PVC filament for use in doll hair according to claim 7 , wherein the cross-linked silicone oil is comprised of an OH-terminated polydimethyl siloxane, amino-modified polydimethyl siloxane, and an epoxy silicone.