Abstract Crimped synthetic filament characterized by having special cross-sectional profile remarkably deformed from circular or polygonal ones of the conventional synthetic filaments. Peculiarity of the profile, being provided with at least tripartite branches extending from a central portion, is defined by the relations among number of crimps, measure of the crosssectional profile, width and length of branches and areas of the cross section and of the smallest circumscribed circle. A manufacturing method characterized by using a spinneret having orifices of special profiles and definition of the ejecting position of coagulating air. Durable resilience to bending, enhanced covering effect of the filaments obtained with effective elimination of waxy touch or remarkable pill formation distinguished from conventional synthetic filaments are brought about by the invention.
An improved crimped synthetic filament according to claim 1, further characterized by said cross-sectional profile being defined by the following equation; 3.0 x/y 11.0 0.15 X/Y 0.60 wherein x 32 Sum of length of branches of said cross-sectional profile of said filament y Average width of said branches of said cross section of said filament X Cross section area of said filament Y Area of a smallest circumscribed circle of said cross section of said filament.
Claim 2
Dependent Claim
60 words
An improved crimed synthetic filament according to claim 1, further characterized by a minimum value of a moment of inertia of area of said cross section of said filament being more than 1.5 times larger than that of an imaginary circle having the same area and a product of tenacity by breaking elongation of said filament being smaller than 100.
Claim 3
Dependent Claim
39 words
An improved crimped synthetic filament according to claim 1, wherein said filament is composed of poly- epsilon -caproamide polymer. 5 An improved crimped synthetic filament according to claim 2, wherein said filament is composed of poly- epsilon -caproamide polymer.
Claim 4
Dependent Claim
19 words
An improved crimped synthetic filament according to claim 3, wherein said filament is composed of poly- epsilon -caproamide polymer.