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Thermally Stable Hot Melt Yarn
Melting Point: 110℃
Specification: 50D/70D/100D/150D, etc.
Color: White
Application: Flat Knitting, Hosiery Knitting, Circular Knitting Machine, Warp Knitting Machine
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Product Introduction
Engineering Overview: High Thermal Stability Polyester Hot Melt Yarn
Thermally stable polyester hot melt yarn is a continuous multifilament fiber spun from modified low-melting-point copolyester (Co-PES). Designed to serve as a heat-activated bonding agent within woven and knitted structures, this yarn transitions into an adhesive state upon reaching its calibrated melting temperature (standard 110°C) and resolidifies upon cooling. Unlike standard thermoplastic fibers that soften unpredictably or lose dimensional integrity under post-processing heat, our thermally stable formulation maintains strict linear density uniformity and controlled shrinkage, preventing fabric distortion during high-speed thermal finishing.
By integrating this functional fiber directly into technical textile structures, fabric mills eliminate external solvent-based adhesives, film laminates, and secondary stitching processes. It provides high shear adhesion, dimensional stabilization, edge anti-fraying, and puncture resistance across polyester hot melt yarn product lines, while ensuring full compatibility with mono-material polyester recycling workflows.
Standard Technical Specifications
| Parameter | Standard Value | Customization Range | Testing Standard |
|---|---|---|---|
| Base Polymer | 100% Copolyester (Co-PES) | Modified PET / Co-PES Blends | ISO 1833 |
| Melting Point (°C) | 110°C ± 3°C | 85°C – 160°C Adjustable | DSC (ISO 11357) |
| Linear Density (Denier) | 50D, 70D, 100D, 150D | 20D – 300D Available | ASTM D1907 / ISO 2060 |
| Filament Count | 24F / 36F / 48F | Single filament up to 72F | Internal Verification |
| Tenacity (cN/dtex) | ≥ 2.8 cN/dtex | 2.6 – 5.5 cN/dtex | ASTM D2256 |
| Elongation at Break (%) | 25% – 40% | Engineered to Knitting Specs | ASTM D2256 |
| Thermal Shrinkage (100°C) | ≤ 3.5% | Controlled Shrinkage Options | Hot Air Oven Method |
| Standard Color | Raw White / Pure White | Custom Dope-Dyed (MOQ applies) | Visual / Colorimeter |
| Packaging Format | Paper / Plastic Cones (1.0–1.5 kg/cone) | Custom Bobbin / Carton Weight | Standard Export Pallets |
Core Engineering Properties & Advantages
01 Dimensional & Thermal Stability
Engineered to resist premature thermal degradation and uneven shrinkage during heat-setting. The polymer chains retain controlled molecular orientation, ensuring that the base fabric maintains exact geometric tolerances and smooth surface appearance after steam or hot-press processing.
02 Robust Bonding & Mechanical Integrity
Forms durable inter-fiber fusion bonds with primary polyester, cotton, and blended yarns. Delivers superior peel strength and seam reinforcement, preventing edge unraveling and increasing abrasion resistance in structural textiles.
03 Laundering & Dry-Cleaning Durability
The cured Co-PES bonding matrix resists hydrolytic degradation during repeated high-temperature washing cycles (up to 60°C–90°C) and dry-cleaning solvents, outperforming lower-grade adhesive fibers in long-term durability.
04 Eco-Friendly Mono-Material Recyclability
Replaces chemical liquid glues, latex, and TPU films. When paired with polyester base fabrics, the entire assembly remains 100% polyester, streamlining end-of-life circular recycling in compliance with global sustainability mandates.
Processing & Heat-Setting Guidelines
To achieve uniform bonding and maintain yarn stability during manufacturing, configure downstream finishing equipment within the following operational parameters:
| Thermal Process | Recommended Temperature | Dwell Time | Applied Pressure |
|---|---|---|---|
| Flat Heat Pressing | 115°C – 130°C | 10 – 20 seconds | 0.2 – 0.4 MPa |
| Continuous Roller Calendering | 120°C – 135°C | Line speed dependent | 2.0 – 4.0 bar |
| Steam Chamber Setting | 110°C – 120°C | 30 – 60 seconds | Atmospheric / Saturated |
| Hot Air Stenter / Oven | 120°C – 140°C | 45 – 90 seconds | Convective airflow |
Note: Processing parameters must be calibrated based on base fabric density, composite thickness, and machine heat transfer efficiency. Pre-production sample testing is recommended to optimize bonding strength without over-melting.
Knitting & Weaving Machine Compatibility
Computerized Flat Knitting
Feeds smoothly through 12G, 14G, and 16G yarn carriers for 3D shoe uppers, structured knit collars, seamless panels, and multi-zoned elastic apparel.
Circular & Warp Knitting
Engineered with anti-static silicone finish to prevent build-up and filament breakage during high-speed warping, circular knitting, and tricot operations.
Braiding & Technical Weaving
Integrated into Bondi sewing thread twisting, high-strength industrial webbing, and edge binding tapes to achieve anti-split performance.
Target Industrial Applications
Footwear & 3D Flyknit Shoe Uppers
Provides critical structural shaping, toe-puff reinforcement, eyelet reinforcement, and clean edge trimming for lightweight sports footwear. For alternative elastic bonding, review our nylon hot melt yarn selections.
Automotive Interior Textiles
Applied in seat cover lamination, headliners, door trim panels, and acoustic insulation layers requiring strict thermal resistance, low fogging, and zero VOC emissions.
Bondi Sewing Thread & Cords
Blended with high-tenacity polyester filament to bond multi-ply threads internally during heat twisting, preventing untwisting during high-speed industrial stitching.
Home Textiles & Technical Fabrics
Used in mattress borders, chenille yarn locking, curtain pleating, high-elastic suit interlinings, and filtration media bonding. Explore complementary bonding options in our hot melt web catalog.
Quality Assurance & Factory Testing Protocols
Every production lot of thermally stable polyester hot melt yarn produced by WithTech New Material undergoes rigorous in-house laboratory testing to guarantee batch-to-batch consistency:
- Differential Scanning Calorimetry (DSC): Verifies precise melting point range (±3°C) and enthalpy of fusion.
- Tensile & Elongation Testing: Measures breaking strength and elongation curves to ensure high-speed machine runnability without yarn snap.
- Thermal Shrinkage Analysis: Evaluates free-shrinkage rates in hot air and boiling water to prevent fabric distortion.
- Bond Peel Strength Verification: Validates adhesive bonding force between knitted substrate layers after standard heat activation.
- Environmental Compliance: Certified compliant with OEKO-TEX Standard 100 Class I/II and Global Recycled Standard (GRS), verifying the absence of harmful plasticizers, heavy metals, and free formaldehyde.
Customization Capabilities & OEM Support
As a direct manufacturer, we offer end-to-end customization to match specific client machinery and substrate characteristics:
- Melting Point Tailoring: Formulation adjustments from 85°C to 160°C to accommodate temperature-sensitive materials.
- Linear Density Customization: Fine deniers (20D, 30D, 50D, 75D) for delicate lace and ultra-light knits; heavy deniers (150D, 200D, 250D, 300D) for heavy industrial webbing and automotive composites.
- Bicomponent Configurations: Core-sheath structures (standard PET core with Co-PES low-melt sheath) available for specialized structural reinforcement.
- Packaging & Spool Specifications: Tailored bobbin sizes, net weights (500g to 2.0kg), and custom palletizing for automated unwinding racks.
- Color Matching: Custom dope-dyed color developments upon meeting minimum batch thresholds.
Request Technical Data Sheets & Sample Cones
Need trial bobbins to calibrate your knitting feeds or heat-setting lines? Contact our technical engineering team for model recommendations, custom melt point development, and bulk export pricing.
Inquire for Specifications & QuoteFrequently Asked Questions
What is the difference between polyester hot melt yarn and nylon hot melt yarn?
Polyester hot melt yarn generally features a higher melting temperature (typically 110°C–160°C vs. 85°C–110°C for nylon), higher structural rigidity, and superior heat resistance after bonding. It is preferred for polyester-based fabrics, automotive interiors, and products requiring firm dimensional support. Nylon hot melt yarn provides higher elasticity and a softer hand-feel, making it ideal for intimate apparel and stretch sportswear.
Can this yarn be processed on standard commercial knitting machines without modifications?
Yes. Our thermally stable polyester hot melt yarn is wound with consistent tension and coated with an anti-static oiling agent, allowing it to feed seamlessly through computerized flat knitting, circular knitting, warp knitting, and twisting machinery alongside conventional base yarns at room temperature.
What is the standard minimum order quantity (MOQ) and lead time?
For standard raw white specifications (50D, 70D, 100D, 150D at 110°C), the MOQ is 200 kg with an export lead time of 7–15 working days. Custom melting points, special deniers, or custom colored yarns require an MOQ of 1,000–2,000 kg depending on raw material synthesis requirements.
How should samples be tested before bulk production?
We recommend knitting or weaving trial swatches using your intended machine setup, then testing bonding performance across a temperature matrix (e.g., 115°C, 120°C, 125°C, 130°C) with measured dwell times and pressure settings. Evaluate bond peel strength, hand feel, and dimensional shrinkage to establish your factory standard operating procedure.
How does polyester hot melt yarn support textile recycling regulations?
Because the bonding agent is 100% polyester (copolyester), integrating it into polyester fabrics creates a 100% mono-material composite. This eliminates the need to chemically separate TPU films, EVA glues, or stitching threads during mechanical and chemical textile recycling processes, complying with EU circular economy frameworks.
Related Products & Technical Resources
Explore our complete portfolio of thermal bonding fibers and adhesive webs for comprehensive manufacturing solutions:
- Hot Melt Yarn Collection – Complete overview of low-melting-point polyester and nylon bonding filaments.
- Polyester Hot Melt Yarn Series – Standard and specialized denier specifications for textile manufacturing.
- Nylon Hot Melt Yarn Series – Low-temperature bonding solutions for elastic and soft-touch textiles.
- Hot Melt Adhesive Web Films – Non-woven PES and PA web structures for continuous textile lamination.
- Contact WithTech Engineering Team – Technical support, sampling inquiries, and factory audits.
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