Patent GB-1163697-A (GB)
Title: Method of Treating Synthetic Fabric Webs to Set the Texture of the Fabric.
Inventor: HERMES JULIUS
IPC: D02G1/20
Filed: 1968-02-16
Abstract: 1,163,697. Finishing fabrics; treating synthetic fibre fabrics. J. HERMES and B. KLEBANOW. 16 Feb., 1968 [24 Feb., 1967], No. 7802/68. Headings D1P and D1S. In the treatment of a web of textile fabric formed of synthetic fibres, e.g. polyester, polyamide, polyacrylic, polypropylene or cellulose triacetate fibres, which have been textured at a predetermined temperature, in which the texture of the filaments is reset at a higher temperature and the interlacing loops and off sets of the fabric are also set so that they exhibit elastic memory at this higher temperature, the fabric web supported in an open condition is immersed in a bath of liquid maintained at a substantially constant temperature which is higher than the predetermined temperature at which the fibres were originally textured but below the glass transition temperature of the fibres so that the fibres in the web are heated to substantially the temperature of the liquid, and the web is removed from the bath and cooled to set the texture of the fibres and the interlacing loops and offsets of the fabric. The fabric web may be supported on a conveyor which may be formed by a tenter frame which employs pins or clips to support the fabric web at a controlled width between a pair of rails moving at a constant speed, and which carries the web in a longitudinal direction through the bath, shrinkage in both the longitudinal and transverse directions being allowed by overfeeding the fabric web onto the conveyor arid by adjusting the width of the conveyor in the region of the bath to allow for transverse shrinkage if the fabric web has not been preshrunk. The fabric web may be immersed in the treating liquid at 300‹-450‹F for 1-15 seconds and the liquid may flow with the fabric web in the bath at a velocity substantially equal to or lesser or greater than the velocity of the web. The fabric may be cooled by passing it through a cooling and washing bath and then dried or treated with a dye, antistatic agent or UV absorber. The texture of the fabric may be altered by controlling the tension of the web by controlling the rate of feed and width of the web or by controlling the rate of flow and direction of the treating liquid in the bath. The treating liquid may be a polyhydric alcohol, e.g. ethylene, diethylene, triethylene, tetraethylene, propylene or dipropylene glycol, an alkylene carbonate, e.g. ethylene, diethylene, propylene or dipropylene carbonate, or a mixture thereof, or a mixture of a polyhydric alcohol and diglycollic acid or phosphoric acid. In Fig. 1 fabric web is unwound from roll 10, passed through feeding mechanism 12 and mounted on pins 14 of tenter chain 16 modified so that an offset 18 is provided in which the fabric web is carried through heated liquid 20 in trough 22 provided with a pipe 24 having inlet 26 and outlet 28 and a pump for circulating the treating liquid in the direction of the fabric web. The fabric web is then passed through washing bath 30 maintained at a temperature lower than the temperature of the treating liquid and dried.