21 · Preparation, dyeing and colour
Bleaching and Optical White
Whiteness must be balanced against fiber damage, strength, yellowing risk and the subsequent colour route.
Values to be checked
- Values to be checked 01
- Whiteness index
- Values to be checked 02
- Strength
- Values to be checked 03
- pH neutralization
- Values to be checked 04
- Yellowing risk
Preparation, dyeing and colour
Uniform preparation, the right dye class, controlled recipes and a physical colour standard underpin repeatable lots.
19
Greige Fabric Control and Lot Preparation
Greige rolls must be checked for structure, GSM, width, oil, stains and lot identity before a dye recipe can be managed reliably.
20Scouring and Absorbency
Controlled removal of oils, waxes and process auxiliaries creates uniform wetting and a repeatable dyeing substrate.
22Pre-Setting Synthetic Blends
Heat history in elastane or synthetic structures affects width, GSM, creasing and dye behaviour; pre-setting conditions must be recorded.