Lyocell fibres represent the latest generation of cellulosic synthetic fibres. Apart from the manufacturing process, which is extremely environmentally friendly, and the excellent properties of the ...fibres such as good receptivity for dyes, a low level of shrinkage, a high rate of water absorption and tenacity, this fibre tends to fibrillate under mechanical stress in a swollen condition. This fibrillation can be used to advantage in new fabric types. The best-known variant is the peach-skin effect which gives the fabric a silk-like appearance. Apart from this kind of regular fibrillation, which is desired, crease marks may form and fabric greying may result when dyeing in rope from and home washing. The formation of fold marks can only be avoided, almost entirely, using airflow jets. For this reason, only specially finished dyers are in a position to process fabrics made of Lyocell fibres at the present moment in time. One way of overcoming these problems is to apply fibre a crosslinking. Resin finishing with conventional methylol types of resins produces wash resistant fabrics and knitted goods. To avoid the formation of crease marks when dyeing, crosslinking must take place prior to or at the latest during dyeing. The classical resin finishing agents are hardly suitable for this. One further disadvantage of methylol resins is the growing refusal amongst manufacturers of knitted goods to use the former since they fear too much formaldehyde.
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