PURPOSE: To produce polyolefinic three-dimensional fiber, excellent in strength and opening properties and suitable for producing a flash spun nonwoven fabric sheet by using a single noncombustible halogen-based solvent having low ability to destroy the ozonosphere.
CONSTITUTION: The objective method for producing polyolefinic three- dimensional fiber is characterized by selecting a solvent from the group consisting of 1,2-dichloro-1,2-difluoroethylene, 1,1-dichloro-2,2-difluoroethylene,1,2- dichloro-1-fluoroethylene and 1,1-dichloro-2-fluoroethylene for a polyolefinic solution and regulating the polyolefinic concentration in the polyolefinic solution to 5-25wt.% in a method for producing the fibrillated polyolefinic three- dimensional fiber by passing the polyolefinic solution prepared at a high temperature under a high pressure through a vacuum orifice, a vacuum chamber and a spinneret and releasing the resultant solution to a zone at ordinary temperature under atmospheric pressure.
JPH0593314 | NON-SPUN SHORT ACRYLIC POLYMER FIBER AND MANUFACTURE OF THE SAME |
JP3159765 | METHOD FOR FLASH SPINNING |
WO/1997/041281 | FLASH-SPINNING APPARATUS AND PROCESS |
NAKAYAMA YOSHIAKI