Influence of different preparation and dyeing processes on the physical strength of the Ingeo† fibre component in an Ingeo fibre/cotton blend. Part 2; Bleaching followed by dyeing with disperse and reactive dyes‡

Abstract

A study has been conducted to examine the effect of a vigorous alkaline scour–bleaching preparation, followed by high temperature dyeing, reduction clearing and a reactive dyeing process on the physical strength of the Ingeo fibre component of an Ingeo fibre/cotton blend. The results indicate that the physical strength will be retained at a technically‐ and commercially‐acceptable level provided that prolonged high temperature processing times are not employed.

Dyeing and Fastness Properties of Disperse Dyes on Poly(Lactic Acid) Fiber

“…The effect of preparation and dyeing processes on the strength of PLA contained in the PLA/cotton blend was investigated and it was illustrated that these processes did weaken the PLA fiber but its retained strength after processing was in a commercially acceptable level. However, dyeing PLA/cotton using 1-bath, all-in process with Kayacelon React dyes under neutral conditions at 110 o C did ruin the strength of PLA beyond acceptability (Phillips et al, 2004a(Phillips et al, , 2004c. This experience suggests that the use of higher temperatures or longer times of dyeing can cause degradation of the polymer, an observation confirmed by Kameoka et al (1997) who claimed that the temperature, time and pH of dyeing resulted in a significant reduction in the molecular weight of the polymer.…”

“…The dyeing properties of PLA have been investigated, especially in comparison with PET fiber. The dyeing of 100% PLA fiber has been intensively studied (Scheyer & Chiweshe, 1999;Nakamura et al, 2001;Phillips et al, 2003Phillips et al, , 2004aPhillips et al, , 2004bPhillips et al, , 2004c. Owing to its relatively hydrophobic nature like PET, PLA can normally be dyed with disperse dyes.…”

“…The alkaline hydrolysis takes place and the fiber surface is eroded as depicted in Fig. 3.b) and c), resulting in a substantial reduction of the fiber strength (Phillips et al, 2004a). Therefore, the preparation, dyeing and finishing processes for PLA should be milder than those used for PET.…”

A review of progress in the dyeing of eco-friendly aliphatic polyester-based polylactic acid fabrics

“…The study indicates that a commercially acceptable PLA strength loss is possible, provided that prolonged high temperature processing is avoided (Phillips et al, 2004c). .…”

Poly(lactic acid) fibers (PLA)

“…A detailed study into the effect of the various wet processes on the molecular weight and physical strength of PLA was carried out at UMIST, and this confi rmed the feasibility for suitable processing. 30,31 Dyeing of PLA/wool blends does not present such a problem, as both fi bers have the same characteristic with regard to alkali. Indeed, with their similar stress-strain profi le, there would seem to be some benefi ts compared to PET/wool.…”