PURPOSE: A copolymer or mixed polyamide containing caproamide as the major component is made into a monofilament and the filament is subjected to multi- step drawing to give a polyamide with high straight and knot strength.
CONSTITUTION: A copolymer or mixed polyamide that contains more than 85wt% of caproamide components and has a melting point Tm(°C) 5W30°C lower than the melting point of polycaproamide is melt spun and subjected to multistep drawing in a liquid medium bath under such conditions as satisfying formulaIWVII (T1WT3 are the bath temperatures in the first, second and third step drawing in °C; t1Wt3 are times for which the monofilament passes through each step drawing bath in seconds, E1WE3 are drawn ratios as individual steps and D is the diameter of monofilament after drawing in mm) to give a monofilament of 0.05W0.75mm diameter.
SAITOU ISOO
FUJIOKA KOUTAROU
