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Textile Chemicals
Textile Pretreatment Auxiliaries
Preparation decides everything downstream. These are the auxiliaries that get the cloth clean, wettable and ready to take colour evenly.
Why it matters
What preparation removes
Greige fabric arrives carrying spin finish, sizing, natural waxes and whatever the loom left behind. Preparation removes it so the cloth wets out and takes colour evenly.
Pretreatment is also where water quality enters the process. Hardness ions and trace metals that are not sequestered here will interfere with peroxide bleaching and with the dyebath afterwards.
- Even, rapid wetting on tight constructions
- Removal of oils, waxes and sizing residues
- Controlled peroxide decomposition during bleaching
- Hardness and trace metals held in solution
- A substrate that dyes to the same shade every lot
Product groups
What we make for this stage
Each group covers several grades. Dosage and conditions vary with the fibre and the process, and are given in the technical data sheet for each grade.
01
Desizing agents
Remove the size applied to warp yarns for weaving, so that scouring and bleaching can reach the fibre.
02
Scouring agents
Emulsify and remove natural waxes, spin finish and residual size ahead of bleaching and dyeing.
03
Bleaching stabilisers
Control the rate at which hydrogen peroxide decomposes during bleaching, for an even white and to limit fibre damage.
04
Wetting and penetrating agents
Lower surface tension so the liquor wets the fabric quickly and reaches the core of the yarn.
05
Degreasing agents
Remove machine oil and grease from heavily oiled goods, including knitted fabric where oil has worked into the loops.
06
Chelating and sequestering agents
Hold iron and copper in solution so they cannot catalyse peroxide decomposition, and calcium and magnesium so they cannot precipitate or shift the shade.
Next stage
Once the cloth is prepared
Dyeing auxiliaries take over: levelling, dispersing, anti-settling, fixing, soaping and anti-backstaining agents.
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