for Sweater & Socks Padding Also Used for Filling Fluffy PBT Mixed Pet Composite Fiber

• Usage: Filling Material, Spinning, Non-Woven Fabric, Padding
• Material: PBT Mixed with Pet
• Feature: Anti-Pilling, Abrasion-Resistant, Anti-Distortion, High Elasticity
• Model NO.: BZYLMP 12.8D*32MM
• Fiber Type: Filament
• Color: White
• Function: High Strength Fiber
• Structure: Synthetic Carbon Chain
• Name: PBT Mixed Pet Composite Fiber
• Type: Virgin
• Fineness: 2.8d
• Fiber Cut Length: 32mm
• Style: Siliconized
• Applications: Home Textiles, Filling, etc.
• Supply Ability: 3000 Tons Monthly
• Certificates: All Standard Certificates
• Delivery Time: 15~25 Days
• Fluorescent: Fluorescent/Non-Fluorescent
• Sample: Available
• Sample Cost: Free
• Transport Package: PP Bale
• Specification: Size: 70cm*110cm*120cm/Bale. Weight: 300/320/350kg
• Trademark: BZY FIBER
• Origin: China
• HS Code: 6815190090
• Production Capacity: 20000 Kg/Day
• Package Size: 18.00cm * 12.00cm * 30.00cm
• Package Gross Weight: 50.000kg

Product Description

PBT mixed PET composite fiber
2.8D×32MM
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Specifications can be customized

 

Product Description

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 pain 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. Unlike coated elastic fibers whose resilience washes away, the self-crimp bicomponent structure delivers permanent stretch recovery built into the fiber itself.
 

Optimized 2.8D medium denier hits the sweet spot between plush bulk and smooth softness-thicker than fine denier for substantial faux wool texture, finer than coarse denier to avoid stiff scratchy feel against skin. Standard 32mm fixed length matches universal cotton spinning line parameters perfectly; no machine retooling needed for mass production, which is a huge advantage for mills switching between regular and elastic yarn runs.
 

Dyeing efficiency stands out as a key competitive edge. Atmospheric pressure boiling dyeing cuts steam and chemical consumption vs high-pressure PET dye processes, while yielding richer, deeper color tones with reliable fastness ratings. Raw white base supports full-spectrum custom color dope-dyeing for large orders without sacrificing elastic crimp performance.
 

Physically balanced mechanical properties enable finished fabrics to stretch freely with body movement and snap back to original shape instantly, resisting bagging at knees, elbows and waistlines common in low-quality stretch textiles. The fiber's natural resistance to mildew, chlorine and UV extends garment lifespan for active, beach and seasonal wear lines.
 

Factory implements full batch quality control to unify crimp potential, denier thickness, cut length and elastic recovery rate for every shipment. Free lab samples are available for heat crimp testing, dye trial and spinning line pilot runs. Direct factory bulk supply guarantees stable stock volume and competitive wholesale pricing for long-term textile manufacturer partnerships; adjustable PBT/PET ratio can be customized to tune stretch intensity for specific fabric requirements on large bulk orders.

 

Wide Application Scope

• Elastic Knit Apparel: Stretch sweaters, faux wool pullovers, fitted leggings, long-sleeve base layers, dance tights
• Footwear Textiles: High-stretch casual socks, sports running socks, compression hosiery, thick winter thermal socks
• Active & Outdoor Wear: Fitness training suits, hiking stretch tops, cycling jerseys, ski outer layer lining
• Home Textile Goods: Elastic bed sheet fabric, stretch cushion covers, plush blanket filling, upholstery sofa cloth
• Fashion & Decor Fabric: Faux fur knit fabric, decorative stretch weaving yarn, gift craft textile raw material
• Blended Functional Yarn: Mixed yarn with cotton/viscose for mid-range stretch casual wear and uniform fabrics

Picture details

Product Specification

Product Item	Detailed Parameter
Product Name	Side-by-Side PBT PET Bicomponent Composite Staple Fiber
Spec	2.8D × 32MM fixed uniform cut length
Spinning Structure	Side-by-side bicomponent melt-spun, PBT & PET dual polymer bonded structure
Raw Material	100% virgin PBT & virgin PET polymer chips, no recycled mixed scraps
Natural Color	Pure bright white, free of impurities, spots and residual processing agents
Core Mechanism	Latent thermal crimp from different thermal shrinkage rates of PBT and PET
Elastic Recovery Rate	≥90% after stretching, stable resilience dry & wet condition
Dyeing Feature	Normal pressure boiling dyeable, no carrier needed, bright full color shade
Breaking Tenacity	≥3.4 cN/dtex, stable tensile strength for high-speed spinning
Boiling Water Shrinkage	Controllable crimp shrinkage via heat setting, finished fabric low deformation
Crimp Performance	Heat activated dense three-dimensional crimp, fluffy bulky hand feel
Processing Adaptability	Ring spinning, open-end spinning, blended spinning, nonwoven production
Package	25kg moisture-proof woven bag, pallet stacked for bulk sea shipment
Main Application	Elastic knitwear, faux wool sweaters, stretch socks, sportswear, home textile, upholstery fabric

Core Product 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. Elasticity remains stable in dry, wet, high-temperature washing environments, no permanent deformation after repeated stretching.

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. 2.8D medium denier balances bulkiness and smoothness, ideal for thick knit and faux wool textures.

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, no fading or bleeding after frequent laundry cycles. Greatly cuts dye factory energy and chemical costs compared to standard polyester.

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. Supports 100% pure composite spinning or free blending with cotton, viscose, regular PET to adjust fabric thickness, softness and budget flexibly.

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 and saving labor & equipment investment for textile mills.

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. Mild anti-static property reduces garment clinging and static fly during spinning and wearing.

FAQ

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.