Heat-setting of blended fibre fabrics

New fibres and newer blended fabrics have been produced and these are also to be heat-set for successful dyeing and finishing operations. 

Polyester/long-staple fibres are also used in the linen industry, where the yams may be of either the stretch-broken or unbroken type, but are more commonly of the latter. Heat-setting of such fabrics may be carried out at 180 C for 30 secs on the hot air pin stenter, allowing up to 2% weft shrinkage with overfeeding only to compensate for any warp shrinkage that has occured in the previous process. 

Heat-setting of polyester/silk fibres blended fabrics can be carried out on stenter at 190°C for 30 secs. The introduction of up to 50% polyester does not effect the characteristics drape and handle associated with silk fibres. 

For blended fabrics with cellulosic fibres it is possible to produce heat-embossed blend fabrics with 25% polyvinyl chloride fibres. Heat treatment is carried out by one passage on pin-stenter without overfeed at 85-90 C, and if for example a 15-17% shrinkage is to be achieved, the speed of travel is about 10 m/min. 

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