Drying Rates in Resin Treatment of Lyocell Fabrics

Abstract

Many properties of lyocell fibers are markedly different from those of other cellulosic fibers. Hence, it is necessary to study Lyocell wet processing to determine and characterize variables that have a significant influence on the properties of finished products. At the Christian-Doppler Laboratory, we are conducting an investigation to characterize resin finishing of Lyocell. As a part of this investigation, we are studying the influence of drying conditions in the pad-dry-cure process on the performance properties of the finished products. The influence of the drying rate on the distribution of crosslinking reagents in treated lyocell fabric samples is similar to that reported for other cellulosics, but the effect of reagent distribution on the performance properties of treated lyocell is different from that reported for other cellulosics. These differences may stem from changes that occur in lyocell fibers with moisture sorption.

Durable Press Treatments to Cotton, Viscose, Bamboo and Tencel Fabrics

“…Cotton shows the least crease recovery which is a well known fact. Our results are found to be contradictory to the observations made by Manian and Bechtold (2005).…”

“…The reasons for this are that the covalent bond which is formed as a result of crosslinking has led to an increase in strength. For tencel, the improved crease recovery results agree with the findings of Manian and Bechtold (2005). Also, data on yarn strength of untreated and treated of lyocell show that the resin treatment has led to lower strength.…”

“…It is also a fact that new cross-linking agents, which have been developed as alternatives to DMDHEU, have not become successful due to their high costs, and lower wrinkle recovery. Manian and Bechtold (2005) have looked at the drying rates in resin treatment of lyocell fabrics. The effect of drying rate on the distribution of cross linking agents in treated lyocell fabrics is similar to that reported for other cellulosics but the effect of reagent distribution on the performance of treated lyocell is different from that reported for other cellulosics.…”

Alkali pretreatments and crosslinking of lyocell fabrics

“…Its distribution was determined by the method of negative staining with the dye C.I. Direct Red 81 (De Boer 1980), as described previously (Manian and Bechtold 2005). The carboxyl content was measured with the methylene blue dye sorption method (Klemm et al 2004).…”

Alkali pretreatment and resin finishing of lyocell: Effect of sodium hydroxide pretreatments

“…Direct Red 81, as described previously. 9 The dye content in the specimens was estimated by extraction in a 25% (v/ v) aqueous solution of pyridine at 90 C for 45 min, and this was followed by spectrophotometric measurements of the extracts at 520 nm.…”