| 摘要 |
PURPOSE:To prevent the troubles of fluffing, end-breakage, etc. in the drawing of synthetic fiber, by applying inert hydrated inorganic colloid having film- forming property to an undrawn yarn of synthetic fiber, and hot-drawing the yarn gradually causing the molecular orientation. CONSTITUTION:The hot-drawing of a synthetic fiber made of an aromatic copolyamide of preferably formula I and/or formula II (R1-R3 are H or lower alkyl; Ar1-Ar3 are phenyl, naphthyl, biphenyl, diphenyl ether, etc.) is carried out by coating the undrawn yarn of the fiber with inert hydrated inorganic colloid having film-forming property (preferably composed mainly of colloidal silica or dilatable mica colloid), and drawing the coated yarn gradually causing the molecular orientation of the fiber.
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