What auxiliary products do washing plants need to use?

Washing plants (usually textile washing plants, used for washing of clothing, denim, fabrics, etc.) use a variety of auxiliary agents in the production process to achieve effects such as decontamination, softening, color fixing, bleaching, and wrinkle prevention. The following are the classifications of auxiliary agents commonly used in washing plants and specific products:

1. Detergents

Desizing agent: removes sizing (such as starch, PVA sizing) on fabrics.

Scouring agent: removes natural impurities (grease, wax, etc.) on fibers.

Penetrant (such as JFC): helps aqueous solution to quickly penetrate into the fiber.

Dispersant: prevents dirt from reattaching to the fabric.

Soaping agent: used to remove floating color and residual auxiliary agents after washing.

2. Bleaching agents

Sodium hypochlorite (NaClO): used for conventional bleaching (pH and temperature need to be controlled).

Hydrogen peroxide (H₂O₂): environmentally friendly bleaching agent, commonly used for high-end fabrics.

Reduction bleaching agent (such as sodium dithionite, commonly known as insurance powder): used for reduction bleaching or stripping.

3. Enzyme preparations

Cellulase: used for bio-polishing (removing hairiness and softening) of denim and cotton fabrics.

Amylase: special enzyme for desizing.

Protease: removes protein stains (such as blood stains).

4. Softener

Silicone oil softener: provides a smooth and soft feel.

Cationic softener: suitable for fluffy and soft treatment of towels and knitted fabrics.

Hydrophilic softener: takes into account both softness and water absorption (such as sportswear).

5. Fixing agent

Cationic fixing agent: improves dye fastness (direct dyes, reactive dyes).

Formaldehyde-free fixing agent: environmentally friendly alternative.

6. Functional additives

Anti-wrinkle agent: reduces wrinkles during washing (such as resin finishing agent).

Antistatic agent: used for chemical fiber fabrics.

Waterproofing agent: gives fabrics waterproof properties (need to cooperate with baking process).

Brightener (fluorescent brightener): improves the whiteness or brightness of fabrics.

7. PH regulator

Acetic acid (acetic acid): neutralizes alkaline residues.

Soda ash (sodium carbonate): adjusts pH to alkaline (such as when bleaching).

Citric acid: environmentally friendly acid regulator.

8. Special effect additives

Sandwash: used for the sanding effect of denim and peach skin.

Enzyme stone detergent: used with pumice or artificial enzyme stone for antique treatment.

Snowflake agent: local bleaching of denim (such as potassium permanganate solution).

9. Environmental and safety additives

Biodegradable detergent: meets environmental protection requirements.

Phosphorus-free additives: avoid eutrophication of water bodies

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