(vii) Nylon like Polyester Fibre: Nylon fibre has better elastic properties than polyester. So if we have a polyester with nylon like properties, it could be used in fabrics wherein the elastic properties play a part-- in knitwear / tight fitting dresses etc. so this is a fibre, which will give some stretch (Not as good as what spandex fibre gives) at a reasonable price. Surprisingly the dyeability of this fibre is almost three times that of standard polyester, so another advantage for knitwear - Disperse dyeing at 1/3rd of cost. Fibre is available in 1.7, 2.0 and 3.0 D in 38 / 44 / 51 mm cut lengths. End uses - knit wear / as weft in tight fitting dress including jeans.
(viii) Hollow Apparel Fibre: Is available only in 2.8 D in 38 and 76 mm cut lengths. This hollow fibre has entrapped air that gives excellent thermal insulation. Recommended for thermal underwear and outer wear for use in winters which are severe.
(ix) Dope Dyed Fibre: Are available in black and another 60 plus shades of rainbow. Black dope dyed fibre is made by using carbon black and master batch chips containing inorganic pigments which will be stable at 290 deg. - 300 deg, the temperature used during spinning of polyester fibre.Black dope dyed fibre is used mainly in apparel - preferred for ladies garments. The use of fibre of 60 plus shades is not so much for apparel but for car interiors - seat covers, carpets, curtains. The reason being cars get parked in hot sun for hours, so light fastness values of all dyed goods used inside a car ought to be 7. It is not possible to get this fastness value with disperse dyeing where with certain skills, a dyer could achieve a light fastness value of 5. Therefore top car makers in Japan insist on using dope dyed fibre fabrics. These fibres are usually available in limited deniers like 2.0 D for car interiors and 8.0 D for carpets. The shades here are custom made to match the car exterior shade.
Black dope dyed fibre is available in all deniers and in all cutlenghts.
(x) Cationic Dyeable / Easy Dyeable Fibre: Is available in 1.2, 1.4, 2.0 and 3.0 Den in all cut lengths. The polymer of this fibre has affinity for cationic dyes which gives very vivid and bright shades or prints on polyester. That brightness cannot be obtained with disperse dyes. The fibre is, therefore, recommended for ladies' dress material, children's dresses, draperies and knit wear. By using standard polyester yarns along with yarns from this cationic dyeable fibre, it is possible to get a two tone effect after dyeing.
This fibre also can be dyed with disperse dyes at 98 deg. C. in open becks without the need of a HTHP Dyeing Machine. Thus this fibre is ideal for making 'polyvastra' fabrics - hand spun hand woven polyester khadi fabrics. So far this polyvastra fabric was being sent to large process houses for processing. With this fibre being used, polyvastra could be dyed in a village. Heat setting may be avoided as villagers use fairly loose fitting garments where a little higher shrinkage will not matter.