Applications of Fluorescent Brightener 71 in Industrial Manufacturing

As a direct manufacturer of Fluorescent Brightener 71, we supply downstream industries seeking to enhance visual and functional characteristics in paper, textile, detergent, and plastics production. Below, we outline authentic scenarios where our product is integrated for high-impact, value-added results aligned with current regulatory and quality demands.

1. Paper Manufacturing & Surface Sizing

High-brightness, brilliant white printing and writing papers demand consistent quality and optical properties. Paper mills incorporate our material in the surface sizing or coating process to improve whiteness index and value retention under UV inspection, while complying with environmental and direct-contact legislation for food-grade paper stocks. End customers require uniform shade and anti-yellowing performance throughout storage and print runs.

Industry compliance standards

• EN 646 (Migration of dyes - paper and board for food contact)
• FDA 21 CFR 176.170/176.180 (Paper and paperboard components in contact with aqueous and fatty foods)
• ISO 536:2019 (Paper and board - Linear mass determination)
• REACH Regulation (EC) No 1907/2006

Typical usage ratio

• 0.03–0.1% relative to dry pulp weight; higher loading for recycled fiber grades requiring brightness compensation.

Downstream process integration

• Dissolved in aqueous solution and added to the surface size press or in the coating color, before drying and calendering.

Final product types

• High-brightness office paper, coated art paper, board grades for food packaging, tissue and napkin stock.

2. Textile Processing – Cellulosic Fiber Whitening

Fluorescent Brightener 71 is favored in the continuous or batch whitening of cotton and regenerated cellulose textiles. Brands and dyehouses require a material that performs reliably under high-temperature exhaust or padding methods, delivering high whiteness while supporting wash-fastness and compliance with textile eco-labels. Precise dosage and distribution prevent yellowing or blue overtone, critical for apparel and institutional linens.

Industry compliance standards

• OEKO-TEX® Standard 100, Annex 6 (Harmful substances and residuals in textiles)
• ZDHC MRSL (Manufacturing Restricted Substance List)
• GB/T 7573 (pH determination in textiles for China market)
• EU REACH SVHCs and Annex XVII restrictions

Typical usage ratio

• 0.05–0.3% by weight of fabric (owf); lower end for optical white, higher end for hospital or institutional textiles requiring lasting performance.

Downstream process integration

• Introduced in the final rinse of bleaching or in the padding bath, followed by drying and curing at 120–160°C for durable fixation on fibers.

Final product types

• White T-shirts, bed linens, tablecloths, medical uniforms, sanitary textiles.

3. Detergent and Laundry Formulation

Home and industrial laundry detergent brands use our brightener to compensate for fabric yellowing and maintain “new” white appearance after multiple wash cycles. Its compatibility with anionic surfactants and high solubility in standard formulations makes it a preferred ingredient in liquid, powder, and tablet detergents where flash fluorescence and color stability are needed. Raw material purity ensures no interference with other active components during blending, storage, or use.

Industry compliance standards

• EU Detergent Regulation 648/2004
• SDA (Soap and Detergent Association) Ingredient Communication
• SAFETY & Health standards: GHS and CLP labeling
• Japanese Household Product Quality Labeling Act

Typical usage ratio

• 0.01–0.08% of total detergent weight; dosage adjusted for powder or liquid system and target fabric type.

Downstream process integration

• Premixed in the builder or surfactant phase during pre-blending, or added post-neutralization for non-reactivity with enzymes and bleaching agents before granulation or bottle-filling.

Final product types

• Household laundry powder, automatic dishwasher detergents, institutional laundry detergents, laundry pods/tablets.

4. Thermoplastic Polymer Compounds

In plastics, especially extrusion or injection-molded polyolefins and PVC, end-users require both color quality and UV stability in finished goods. Industrial compounders depend on this brightener to achieve high whiteness, minimize yellowness, and ensure lot-to-lot visual conformity in films, caps, and molded parts. Strict traceability and product stewardship demand compliance with sector-specific migration and food-contact safety regulations.

Industry compliance standards

• EU No 10/2011 (Plastic materials in contact with food)
• FDA 21 CFR 178.3297 (Colorants for polymers used in food packaging)
• RoHS Directive (2011/65/EU) for electrical components
• UL 94 (Plastic flammability rating reporting)

Typical usage ratio

• 10–50 ppm by weight of resin, adjusted depending on resin type, pigment loading, and target optical effect.

Downstream process integration

• Dry blended or masterbatch compounded prior to resin extrusion, film-blowing, injection molding, or blow-molding steps.

Final product types

• White blown film, cosmetic packaging, dairy product caps, appliance housings, cable sheathings.

5. Synthetic Fiber Spinning – Polyester Whitening

Producers of bright and semi-dull polyester staple fibers, filament yarns, and nonwovens incorporate this material for improved white point, especially for applications where final products are subject to repeated washing, dry-heat exposure, or sunlight. Direct introduction to the polymer melt or spin-dye bath ensures fiber uniformity, while strict process control avoids agglomeration or shot formation—critical for nonwoven hygiene and filtration markets.

Industry compliance standards

• OEKO-TEX® Standard 100, Annex 4 (Finished fiber approval)
• ISO 1833 (Fiber content analysis standards)
• REACH Regulation (EC) No 1907/2006 for synthetic fibers
• Japanese Food Sanitation Act for food-contact yarns

Typical usage ratio

• 5–30 ppm relative to polymer melt weight; tighter range required for high-filtration or medical fiber use.

Downstream process integration

• Dosed directly into PET or PA melt phase pre-polymerization, or added during spin-finish application before fiber drawing and crimping.

Final product types

• Bright polyester nonwovens, spunbond filtration media, white sports apparel yarn, microfiber wipes.