PURPOSE: To obtain nonwoven fabric excellent in thermal shrinkage, shape stability on thermoforming and light weight by partially fusing a web from filaments of a specific ethylene-propylene copolymer. ;CONSTITUTION: 92 to 97wt.% of propylene and 3 to 8wt.% of ethylene are polymerized to prepare a random copolymer of less than 8 Q value (the ratio of weight-average MW/number-average MW). The copolymer is melt-extruded into filaments, which are taken up by means of an air sucker. Simultaneously, the filaments are opened under corona discharge so that they are accumulated on a moving conveyer belt to form web containing more than 50wt.% of filaments of 15 to 80g/10min. melt flow rate and less than 10 denier filament fineness. Then, the web is partially fused by means of an ultrasonic fusing machine equipped with engraved rollers to give the objective ethylene-propylene filament woven fabric of 3 to 50% area glued between filaments and more than 15% thermal shrinkage at 100°C.;COPYRIGHT: (C)1994,JPO&Japio
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