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English Views: 0 Author: Site Editor Publish Time: 2025-12-29 Origin: Site
Absorbent SAP Paper is a specialized nonwoven material that integrates superabsorbent polymers (SAP) into a cellulose fiber matrix to create high-performance absorbent cores for disposable hygiene products. Unlike traditional fluff pulp cores, this engineered material delivers 30-60 times its own weight in fluid retention while maintaining structural integrity under pressure. For manufacturers of sanitary napkins, baby diapers, and adult incontinence products, understanding SAP paper's technical specifications is critical for product development, cost optimization, and regulatory compliance. Bleached softwood kraft pulp (typically Northern Bleached Softwood Kraft - NBSK) provides the primary fiber network Basis weight ranges from 60-120 g/m² depending on application Fiber length: 2-4mm for optimal entanglement and SAP retention Cross-linked sodium polyacrylate particles with particle size distribution of 150-850μm Absorption capacity: ≥30 g/g in 0.9% saline solution under load (AUL) Gel modulus: Critical for preventing gel blocking and maintaining permeability Latex binders (SB, VAE, or acrylic-based) for wet strength retention Thermal-bonding fibers (PP/PE bicomponent) for air-through bonding processes Optional: Nano-cellulose as sustainable binder alternative The material employs a three-layer composite structure: Acquisition layer: Lower SAP density for rapid fluid intake Distribution layer: Channel-forming fiber orientation Storage layer: High SAP concentration for locked-in retention This gradient design achieves <5 seconds acquisition time and <2% rewet under simulated use conditions (ISO 11948-1). SAP paper cores are 40-60% thinner than equivalent fluff pulp systems, enabling ultra-thin product designs without sacrificing performance. Coefficient of variation (CV) for absorption capacity is <5% compared to 12-18% for traditional airlaid cores with loose SAP. Continuous roll format reduces scrap by 8-12% versus discrete fluff pulp cores in high-speed production lines (>600 ppm). Fiber opening and blending with SAP Air-forming on vacuum drum Thermal/latex bonding Calendering and slitting Inline quality monitoring Better SAP distribution uniformity Lower binder requirement Higher capital investment but improved sustainability profile Basis weight: IR scanning every 50mm across web width (target: ±3%) SAP distribution: X-ray or optical scanning for uniformity Tensile strength: Real-time MD/CD strength measurement Moisture content: <5% for storage stability Residual monomer: <800 ppm (FDA requirement) Microbial count: <100 CFU/g (USP <61>) Heavy metals: Complying with REACH and Prop 65 Ultra-thin pads: 60-80 g/m² total core weight Overnight pads: 100-120 g/m² with enhanced rear protection SAP content: 40-50% for optimal balance of retention and cost Strike-through: <3 seconds for rapid absorption Rewet: <1.5 g to maintain skin dryness Narrow section: Edge compression resistance >8 N Frontal acquisition zone: Lower SAP density (30%) for repeated wetting Central storage zone: High SAP density (50-55%) for overnight capacity Typical core weight: 4-8 g per diaper depending on size Creeping resistance: Prevent SAP migration during wear pH buffering: Maintain skin-neutral environment (pH 5.5-6.5) Chlorine-free: ECF/TCF pulp for premium segment Higher capacity: Up to 15g total fluid retention for severe incontinence Odor control: Activated carbon or cyclodextrin additives Skin health: Aloe or chamomile extract integration Light bladder leakage (LBL) pads: 80-100 g/m² Protective underwear: 150-200 g/m² Bed pads: 300-400 g/m² with multi-layer construction SAP paper cores generate 12-18% lower CO₂ equivalent than traditional systems due to reduced material usage and transportation efficiency. Cellulose fraction: 90%+ biodegradation in industrial composting (ISO 14855) SAP fraction: Non-biodegradable but recyclable through specialized processes Emerging solution: Bio-based SAP from starch-graft polymers (70% renewable content) FDA 21 CFR 176.170 (food contact indirect) ISO 10993 (biocompatibility for skin contact) OEKO-TEX Standard 100 (harmful substances) FSC/PEFC (sustainable forestry for pulp sourcing) EU: REACH compliance, no SVHC substances US: California Prop 65, CPSIA for baby products Japan: JHPIA standards for hygiene materials ▢ Can supplier provide detailed technical data sheets with test methods? ▢ Do they have in-house R&D and pilot line for customization? ▢ Are regulatory certifications current and verifiable? ▢ ISO 9001:2015 certification ▢ Statistical Process Control (SPC) charts available ▢ Lot traceability system (raw material to finished roll) ▢ Minimum Order Quantity (MOQ) alignment with your needs ▢ Lead time: Standard products <4 weeks, custom <8 weeks ▢ Slitting width range: 40mm to 2600mm capability Price drivers: SAP brand (BASF, Nippon Shokubai, SDP Global), pulp type, binder system Hidden costs: Waste rate, line efficiency impact, storage requirements Total Cost of Ownership (TCO) model: Consider yield and scrap reduction ❌ Suppliers unwilling to provide batch test reports ❌ Single-shift production only (capacity risk) ❌ No established change control process ❌ Price 15%+ below market average (quality compromise) Absorbent SAP Paper represents the evolution of hygiene product cores, offering superior performance, manufacturing efficiency, and product differentiation opportunities. For manufacturers, the key to success lies in understanding the material's technical parameters, aligning specifications with end-product requirements, and partnering with suppliers who demonstrate robust quality systems and technical support. When evaluating SAP paper for your next product development cycle, prioritize demonstrated performance data over marketing claims, and conduct thorough line trials to validate real-world performance in your specific production environment. Ready to optimize your absorbent core strategy? Contact our materials specialists for technical consultations, sample requests, and customized SAP paper solutions tailored to your production specifications and performance targets. A: When stored at <35°C and <70% humidity, unopened rolls maintain performance for 24 months. Once opened, use within 30 days to prevent moisture absorption. A: The cellulose component is compostable, but standard SAP is not. Look for bio-based SAP options for fully compostable solutions. A: Excessive fine SAP particles (<106μm) or insufficient fiber-to-SAP ratio. Optimal particle distribution and adequate acquisition zones prevent this issue.Understanding SAP Paper: The Core of Modern Absorbent Hygiene Products
Technical Composition and Structure
Core Components
1. Cellulose Fiber Matrix (45-65% by weight)
2. Superabsorbent Polymer (SAP) (35-55% by weight)
3. Binding System (3-8% by weight)
Structural Architecture
Key Performance Metrics and Testing Standards
Critical Technical Parameters
Parameter Typical Value Test Method Industry Standard Absorption Capacity 30-60 g/g Tea Bag Test EDANA ERT 440.1 Absorption Speed <5 seconds Strike-Through ISO 9073-13 Retention Under Load ≥25 g/g AUL (0.7 psi) EDANA ERT 442.1 Wetback/Rewet <2.0 g Rewet Test ISO 11948-1 Tensile Strength (MD) ≥15 N/25mm Strip Method ISO 12625-4 Thickness (at 2 kPa) 0.8-2.5 mm Thickness Gauge ISO 12625-3 Performance Advantages vs. Traditional Cores
1. Space Efficiency
2. Consistent Performance
3. Production Yield
Manufacturing Processes and Quality Control
Primary Production Methods
Air-Laid Process (Most Common)
Wet-Laid Process (Emerging)
Quality Control Checkpoints
Inline Monitoring:
Batch Testing:
Applications in Disposable Hygiene Products
1. Feminine Sanitary Pads
Design Specifications:
Performance Requirements:
2. Baby Diapers
Core Configurations:
Critical Considerations:
3. Adult Incontinence Products
Specialized Requirements:
Product Categories:
Environmental Impact and Sustainability
Life Cycle Assessment
Carbon Footprint:
Biodegradability:
Regulatory Compliance
Key Certifications:
Regional Requirements:
How to Select the Right SAP Paper Supplier
Evaluation Checklist for Procurement Managers
1. Technical Capability Assessment
2. Quality Systems
3. Production Scale and Flexibility
4. Cost Structure Analysis
Red Flags to Avoid
Conclusion: Making the Right Material Choice
Frequently Asked Questions
Q: What is the shelf life of SAP paper rolls?
Q: Can SAP paper be used in compostable products?
Q: What causes gel blocking in SAP paper?
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