Dyed nylon carpet yarns

Knit-deknit and tufting lubricant for space dyed nylon carpet yarn. 

Dyeing of Nylon Carpet with Disperse Dyes. The objective of the first trial in the pilot-scale experiments was to dye nylon carpet to the same shade five times with reuse of the dyebath [8). The carpet was tufted from Nylon 6 face yarn with a polypropylene primary backing. Both regular nylon and cationic-dyeable yarns were used in the carpet however, the two types of yarns dyed to essentially the same color with disperse dyes. The carpet surface contained both cut pile and loops. 

To make cut pile carpets, two strands of BCF yarns are twisted together and heat-set with steam using a Superba heat setting machine at 135-145 °C or at 175-195 °C when heat-set with super-heated steam in a Suessen. An experimental design experiment [94] showed the higher the heat set temperature, then the lower is the bulk of the final carpet, but there is an increase in the tip definition and walk performance. The tufted carpets are then dyed with disperse dyes at atmospheric boil [95] in a continuous or a batch process. PTT carpets showed excellent resiliency in walk test experiments, equivalent to a nylon and much better than both PET and polypropylene, had lower static charge of <3.5 kV, and were resistant to coffee, mustard, betadine, red acid dyes and other stains [96],... 

Wool-Nylon. Nylon has been blended with wool in order to give additional strength to the yarn or fabric, it is used mainly in tbe woollen industry for coats and jackets and, to a lesser extent, for socks and carpet yams. Both fibers are dyed with the same products, however the fibers have different affinity to them. Generally level dyeing acid dyes are applied. 

PTT flbers and yarns have bulk, resiliency, stretch-recovery, softness, hand and drape, properties which are similar to Arose of nylons and much better Aran those of PET. Such materials are iiArerently resistant to most stains which are acidic in nature because they not have dye sites. They also have a lower static propensity Aran nylons. PTT fibers are dyed with disperse dyes but at a lower temperature Aran PET because of the polymer s lower Tg. The combinations of these properties are athactive to carpet and textile manufacturers in some applications where PTT could replace nylon or PET. PTT also offers the potential of creating new fiber products by using the unique combinations of these properties not found in either nylon or PET alone. 

Carpets. The process of making PTT BCF carpets has been described in detail (57). The extruded yarn is drawn between sets of heated godets to a draw ratio 2.8-3.5 (58,59). It is then textured with hot air at 160-220°C and at a pressure of 0.6-1.0 MPa (87-145 psi) (60). Heat-setting with steam is at 135-145°C or at 175-195°C (61) when heat-set with the less effective heat conducting superheated steam. Tufted carpets are dyed with disperse dyes at atmospheric boil (62) in a continuous or a batch process. PTT carpets show excellent resiliency equivalent to a nylon in walk tests, have lower static charge of <3.5 kV, and are resistant to coffee, mustard, betadine, red acid dyes, and other stains (63). 

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