METHOD FOR PRODUCING DRAWN CONJUGATED FIBER, AND DRAWN CONJUGATED FIBER

Provided are a method for producing a drawn conjugated fiber, capable of producing a conjugated fiber having a high strength and a thin fineness, and a drawn conjugated fiber. A drawn conjugated fiber is produced by performing a spinning step of obtaining an undrawn fiber having a core-sheath struct...

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Bibliographische Detailangaben
Hauptverfasser:	YASHIRO Hirohumi, ENDOU Kouki, TSUKAHARA Tatsunori
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS NATURAL OR ARTIFICIAL THREADS OR FIBRES PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SPINNING TEXTILES TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Provided are a method for producing a drawn conjugated fiber, capable of producing a conjugated fiber having a high strength and a thin fineness, and a drawn conjugated fiber. A drawn conjugated fiber is produced by performing a spinning step of obtaining an undrawn fiber having a core-sheath structure in which a core material is a resin containing, as a main component, a crystalline propylene polymer and a sheath material is a resin containing, as a main component, an ethylene polymer having a melting point lower than that of the core material, by means of melt-spinning (step S1); and a drawing step of drawing the undrawn fiber (step S2). During the production, a fineness of the undrawn fiber is adjusted to 1.5 dTex or less, and, in the spinning step, a melt flow rate of the core material discharged from the spinneret is adjusted to 70 to 170 g/10 minutes at 230°C and a load of 21.18 N, and a ratio (= a core material MFR/a sheath material MFR) of the melt flow rate of the core material discharged from the spinneret at 230°C and a load of 21.18 N to a melt flow rate of the sheath material discharged from the spinneret at 230°C and a load of 21.18 N is adjusted to 1 to 2.2.