2.8D*32MM PBT PET Composite Staple Fiber, Latent Crimp High Elastic Fiber for Knitting Apparel Excellent Spinnability filling Fiber
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2.8D×32MM PBT PET Composite Staple Fiber PBT mixed PET composite fiber Product Overview Our 2.8D×32MM PBT PET side-by-side bicomponent composite staple fiber is a mature cost-effective elastic functional textile raw material, engineered to combine PBT's superior soft stretch and PET's stable durable performance in one fiber structure. It solves three major industry points: high cost of spandex, poor elasticity of ordinary PET, and low dimensional stability of pure PBT fiber, becoming a mainstream stretch raw material for global knitting and weaving factories. The core side-by-side melt-spun design locks PBT and PET tightly at the molecular interface without delamination or splitting during drawing, spinning and post-processing. Latent crimp is activated simply via standard heat-setting after spinning, forming uniform compact 3D curls that create fluffy bulk and consistent stretch across every yarn batch. Technical Specifications
Core Advantages 1. Latent Self-Crimp Bicomponent Structure, Permanent High
Resilience Made by side-by-side co-extrusion spinning of PBT and PET with different thermal shrinkage coefficients. After heat setting, natural dense 3D crimp forms automatically, delivering lasting stretch and rebound performance. Elastic recovery above 90%, far superior to ordinary single PET fiber; serves as economical spandex replacement without yellowing or aging defects of spandex. 2. Balanced Softness & Structural Strength, Perfect PBT+PET
Synergy PBT component brings ultra-soft, silk-like hand feel, excellent flexibility and wear resistance similar to nylon; PET reinforces dimensional stability, heat resistance and tensile strength to offset PBT's high-temp weak rigidity. The composite fiber combines the best of both polymers: fluffy soft touch, tough tensile performance, wrinkle-free and shape-retention for finished garments. 3. Normal Pressure Easy Dyeing, Bright Color & Stable Color
Fastness Unlike pure PET requiring high-pressure high-temp dyeing, PBT PET composite fiber achieves vivid, saturated color under atmospheric boiling water with regular disperse dyes, no expensive carrier additives needed. Color fastness to washing, rubbing and sunlight reaches Grade 4-5; dyed fabrics maintain consistent shade batch to batch. 4. Standard 32MM Uniform Cut, Excellent Full-Scale Spinnability Precision fixed 32mm cotton-type cut with neat incision, ultra-low broken filament and flying waste during high-speed carding and spinning lines. Fiber bundle holds good cohesion and fluidity, runs smoothly on all mainstream spinning equipment with low yarn breakage rate, boosting production yield and lowering factory loss cost. 5. Cost-Effective Stretch Solution, Lower Total Production Cost Much more affordable than pure PBT fiber and spandex; delivers 70-80% of spandex's elastic performance at far lower raw material price. No extra spandex covering or core-spun steps required; one-step spinning of PBT PET staple directly makes stretch yarn, simplifying production workflow. 6. Abrasion, Mildew & Light Resistant, Long Service Life Inherits polyester's strong chemical stability, resistant to mildew, moth, chlorine bleach and UV light exposure. Garments woven from this fiber resist yellowing, brittleness and strength drop under long-term sunlight and repeated washing, ideal for outdoor sportswear, daily wear and long-use home textiles. Application Scenarios
Frequently Asked Questions Q1: How does PBT PET fiber create elasticity without spandex? A1: Side-by-side dual polymers have different thermal shrinkage
rates; heat setting triggers natural 3D latent crimp inside each
fiber to deliver lasting stretch and rebound. Q2: Is elastic recovery stable after repeated washing? A2: Yes, crimp structure is inherent to the bicomponent fiber,
resilience does not degrade after dozens of standard laundry
cycles. Q3: Can it be dyed under normal atmospheric pressure? A3: Definitely, PBT component enables boiling dye with regular
disperse dyes, no high-pressure equipment or carrier chemicals
required. Q4: What is the advantage vs pure PBT fiber? A4: PET boosts dimensional stability, heat resistance and lowers
raw material cost; composite balances soft stretch and structural
toughness better than single PBT. Q5: Does it work with regular ring spinning machines? A5: 32mm standard cotton cut length fits all mainstream spinning
lines, low breakage rate, no equipment modification needed. Q6: Can blend with cotton, viscose or ordinary polyester? A6: Excellent blending compatibility, adjust stretch, softness and
production cost via custom mixing ratios freely. Q7: Are samples available for crimp and spinning testing? A7: Small test samples are supplied free of charge for lab
performance verification and production line trials. Q8: Can I adjust PBT proportion for higher/lower stretch? A8: Custom PBT/PET blending ratios to tune elastic strength
available for large volume bulk orders. |
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2.8D*32MM PBT PET Composite Staple Fiber, Latent Crimp High Elastic Fiber for Knitting Apparel Excellent Spinnability filling Fiber |