PROCESS AND DEVICE FOR MANUFACTURING HIGHLY ORIENTED AMORPHOUS POLYESTER FILAMENT YARNS

摘要

In a process for manufacturing fast spin highly oriented amorphous polyester filament yarns (2), the shock cooling is achieved by means of a rotating cooling surface formed, in a prefered device, by the contact surface of a cooling cylinder (3). Filament yarns having a desired shrinkage on boiling up to 70 % and a birefringence DELTA n > 0.08 can be obtained by varying the duration of contact between the filament yarns (2) and the cooling cylinder (3) and/or the distance between the spinneret (1) and the cooling cylinder (3).