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Cellulase for Textile Biopolishing and Denim Finishing — Pilling Removal, Fabric Softening, and Stone-Wash Effect

Use cellulase enzyme to remove surface microfibrils from cotton and denim, delivering pilling-free biopolished fabric and authentic stone-wash appearance without pumice stone or mechanical abrasion.

Textile biopolishing and denim finishing are two of the highest-volume applications for cellulase enzyme in industrial manufacturing. In cotton biopolishing, cellulase selectively hydrolyzes the protruding microfibrils on yarn and fabric surfaces — the short, loose cellulose fibers that cause pilling, surface fuzz, and reduced color brightness. By removing these microfibrils enzymatically, the fabric acquires a cleaner, smoother surface with less pilling propensity, brighter color, and improved hand feel, all without the mechanical stress of sanding, emerizing, or harsh chemical treatment. In denim finishing, cellulase enzyme creates the stone-washed appearance by acting on the indigo-dyed surface fibers of denim weave, abrading the surface cellulose structure to reveal the undyed yarn core beneath — the characteristic faded look of worn denim. This enzymatic stone-wash effect replaces or substantially reduces the use of pumice stone, which causes machine wear, generates difficult-to-dispose pumice sludge, and creates inconsistent abrasion. Cellulase enzyme from Trichoderma reesei and Aspergillus niger is produced in two commercially distinct types for textile use: acid cellulase (pH optimum 4.5–5.5, 45–55°C) and neutral cellulase (pH optimum 6.0–7.0, 40–50°C). Acid cellulases are faster-acting and provide more pronounced surface modification but require careful dosing to avoid backstaining (re-deposition of removed indigo dye onto fabric). Neutral cellulases offer gentler, more controlled action with reduced backstaining risk — preferred for fashion denim where color consistency is critical. Dosage in textile applications is typically 0.5–3.0% on fabric weight, with process time of 30–60 minutes at pH and temperature controlled within the enzyme's working range. The enzyme is inactivated at the end of the wash cycle by a brief alkali wash (pH > 9) or heat treatment, preventing ongoing cellulose damage after the target effect is achieved. For procurement teams in textile mills and laundry finishing operations, the key specifications are enzyme type (acid vs. neutral), activity grade, backstaining tendency, and consistency of the fading or biopolishing effect across production batches.

Cotton fabric biopolishing for pilling reduction and color brightness

Cotton knitwear, woven shirts, and home textiles treated with cellulase enzyme at 0.5–1.5% on fabric weight, pH 4.5–5.5, 45–55°C, for 30–45 minutes achieve significant reduction in surface pilling propensity and improved color depth. The enzyme hydrolyzes loose surface microfibrils without damaging the main yarn structure, producing a cleaner fabric surface. The biopolishing effect is permanent across the product's wash life because the source of pilling — the loose microfibrils — has been removed enzymatically rather than masked.

Denim acid-wash and stone-wash effect

Acid cellulase enzyme at 1.0–3.0% on garment weight, pH 4.5–5.5, and 50–55°C for 30–60 minutes creates strong stone-wash fading effects on indigo-denim by aggressively abrading surface yarn fibers. The acid enzyme's fast action produces high contrast fading on seams, pockets, and high-abrasion zones. Backstaining is managed by short treatment times, enzyme inactivation at completion, and rinsing with anti-backstaining agents. This route is preferred for vintage and distressed denim where pronounced contrast fading is the design objective.

Denim neutral cellulase finishing for fashion and premium denim

Neutral cellulase enzyme at 1.0–2.5% on garment weight, pH 6.0–7.0, and 40–50°C for 40–60 minutes provides a gentler, more uniform surface modification with significantly reduced backstaining compared to acid cellulase. The neutral enzyme is preferred for fashion denim where even, subtle fading and clean cross-dyeing are required. Neutral cellulase biopolishes the surface fibers uniformly, giving a smoother fabric hand and a more wearable fading appearance without harsh contrast.

Combination stone-enzyme wash for denim with pumice reduction

Mills using legacy pumice stone washing can reduce stone load — and associated machine wear and sludge — by combining cellulase enzyme treatment with reduced pumice. Cellulase at 0.5–1.5% on garment weight, pH 4.5–5.5, and 50°C for 20–30 minutes precedes a short stone wash at 20–30% of the normal pumice load. The enzyme provides uniform cellulose surface modification, while the reduced stone provides targeted mechanical abrasion on seams and panel areas. This hybrid approach reduces pumice sludge volume by 60–80% while maintaining the desired denim appearance.

Product Specifications

Parameter Value
Activity range 10,000 – 100,000 U/g
Optimal pH 4.0 – 6.0
Optimal temperature 45°C – 60°C
Form Light brown to brown powder or liquid
Shelf life 12 months (sealed, cool, dry place)
Packaging 25 kg drums (powder) / 30 kg jerricans (liquid)

Frequently Asked Questions

What is the difference between acid cellulase and neutral cellulase for denim finishing?

Acid cellulase has its optimal activity at pH 4.5–5.5 and 45–55°C, and acts aggressively on cotton surface fibers, producing strong fading and contrast effects in denim. Its faster action also makes it more prone to backstaining — the re-deposition of removed indigo dye onto the fabric in an uneven pattern. Neutral cellulase operates at pH 6.0–7.0 and 40–50°C, with a gentler, more uniform action that produces subtler fading and significantly less backstaining. For fashion denim with even tone and clean appearance, neutral cellulase is preferred. For vintage and distressed denim with high contrast, acid cellulase is more suitable. Both types are available from us — specify your application and target effect and we'll recommend the right grade.

How do I prevent cellulase enzyme from damaging the denim fabric excessively?

The key controls for preventing over-treatment in cellulase denim finishing are time, temperature, enzyme dose, and inactivation. Cellulase continues to act on cellulose as long as it remains active in the bath, so enzyme inactivation at the end of treatment is essential. Standard inactivation methods are raising the bath pH above 9.0 with soda ash and holding for 10–15 minutes, or heating to 80°C for 10 minutes. Monitoring the process by periodically checking tensile strength retention on reference fabric swatches and matching visual shade targets before scale-up helps prevent over-treatment. Dosage should start at the lower end of the range and be adjusted upward only with confirmed visual and strength results.

What dosage of cellulase enzyme is needed for cotton fabric biopolishing?

Dosage for cotton biopolishing depends on fabric construction, yarn count, desired pilling reduction, and contact time. A typical starting point for knitwear biopolishing is 0.5–1.0% cellulase enzyme on fabric weight, pH 4.5–5.5, at 45–55°C for 30–45 minutes. For heavier woven fabrics where more surface modification is needed, doses of 1.0–2.0% on fabric weight with 45–60 minutes contact are common. Dosage optimization should include pilling resistance testing (Martindale or tumble pilling) and tensile strength retention testing to confirm the right balance between surface improvement and fiber integrity.

Can cellulase enzyme be used on blended fabrics such as cotton-polyester?

Cellulase enzyme acts specifically on cellulose and does not degrade polyester, nylon, or synthetic fibers. On cotton-polyester blends, cellulase modifies only the cotton fraction — removing cotton surface microfibrils, reducing cotton pilling, and improving hand feel — without affecting the polyester fiber structure. This is useful for blended sportswear and workwear fabrics where cotton pilling is a complaint but polyester fiber integrity must be maintained. Treatment conditions are the same as for 100% cotton, with dose adjusted proportionally to the cotton content of the blend.

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