• Use polyester fibre with low oligomer content. Oligomer deposition on the surface of the fabric leaves behind whitish impurities, which remain on the fabric even after severe reduction clearing and dyeing with vat dyes on jigger. This happens mainly while beam dyeing of polyester. Another solution is to drop the bath at high temperature into a pond of cool water. Oligomers are soluble at such high temperature. Jet dyeing should be preferred to beam dyeing machine.

Streakiness

Usually in the warp direction, instances of weft streakiness can also be found. Fabric related warp streaks show a sharp boundary running along the warp, wherein single or multiple warp threads are present. Warp threads processing run parallel to the warp, but involve different warp threads along the fabric length. They generally do not involve a single warp thread. It is not always easy to identify the root cause of streakiness and all the causes mentioned above should be taken care of to avoid streakiness

Antipilling

The textile finishers role has become increasingly demanding. It requires careful balance between the compatibility of different finishing products and the treatment. Certain rubber-based latex compounds, non-ionic polyurethane resins, and self-cross linking binders can all be used as effective antipilling agents.

The enzymatic process biopolishing improves fabric quality. Cellulose enzymes processing cellulose-based fabrics gives superior handle, luster and novel finishes on cellulose. Hence, they can be effectively used as antipilling agents.

References

• ND Iyer, Polyester the most versatile synthetic fibre, Colourage, September 01 to February 04 (series of 26 articles)
• AK Samnta, Road map for wet processing of micro denier polyester fabric and relevant studies on its dyeability, Man Made Textiles, October 03
• Dr Bharat Desai, Oligomer control in polyester fibre processing, Colourage June 05
• Prof VA Shenai, Technology of dyeing
• Mr CN Sivaramkrishnan, Dispersing Agent, Colourage, September 05
• AD Sule, Practical Problems in dyeing of polyester off shades, Man Made Textiles, December 03
• Search engine google.com

The author is associated with Resil Chemicals, Ahmedabad