| 摘要 |
PROBLEM TO BE SOLVED: To carry put draw false twist so that separately colored pattern caused by deeply dyeable parts and lightly dyeable parts may be formed by one yarn only by setting and inputting a parameter. SOLUTION: A means for setting and inputting the parameter when changing the ratio of the revolution speeds of a feed roller FR1 at the upstream side of the first heater 2 to a feed roller FR2 at the downstream side of a false twist device 4, and a means 6 for forming a de- and accelerating pattern based on the set and inputted parameter, and deand accelerating, and controlling at least one feed roller FR1 based on the de- and accelerating pattern are installed. The de- and accelerating pattern is formed based on the set and inputted parameter, and the revolution speed of the feed roller FR1 is changed based on the de- and accelerating pattern to change the draw ratio of the yarn Y. As a result, the density of the polymer of a resin raw material for the yarn can be partially changed, and the separately colored pattern with the deeply dyed part and the lightly dyed parts can be formed in one yarn in a dyeing step of the yarn carried out later.
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