An apparatus for heat treating a synthetic yarn during false-twist texturing and method for false-twist texturing

摘要

A heater body has a total length between 0.8 and 1.2 m, the heater body and heating member are divided into two pieces from upstream side to downstream side of the heat treating apparatus in ratio of length between 1 : 3 and 1 : 1.5, the divided upstream heating member (12) is able to heat the upstream heater body (11) at a temperature higher than 370°C, and the downstream heating member (22) is to heat the downstream heater body (21) at a temperature of between 200 and 320°C or higher than 370°C, the upstream heater body has yarn guides (15) disposed at a longitudinal pitch of at most 30mm, and the downstream heater body has yarn guides (24) disposed at a longitudinal pitch between 80 and 120mm.