| 摘要 |
PROBLEM TO BE SOLVED: To obtain polylactic acid filament nonwoven fabric that has excellent heat shrinkage because the heat shrinkage of constituent filaments is extremely reduced by further refining the conventional technology and shows excellent fabric quality by reducing the defects. SOLUTION: When polylactic acid polymer is melt-extruded into filaments and the filaments are piled up to produce filament nonwoven fabric according to the spun bonding process, a non-contact type heater 4 is arranged directly under the spinneret 2 to heat the extruded filament yarn 3, then the extruded yarn 3 is drawn with a drawing machine 7 at a speed of 6,000 to 8,000 m/min. COPYRIGHT: (C)2005,JPO&NCIPI
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