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sheath core yarn

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Introduction

Sheath core yarn is a bi-component filament in which every filament has two polymers: a core that carries the strength, and a sheath that provides a second function. The most common function is bonding. When the sheath has a lower melting point than the core, heat softens only the outer layer, so filaments fuse to each other while the core keeps its shape and strength.

GC FIBER develops functional yarns, and sheath core structures sit close to our Low Melting Yarn and Bio-component Yarn ranges. The yarn feels like a regular multifilament before heat is applied, and after heat setting the fabric becomes firmer and more stable. Other sheath and core pairings can be developed when you need a different surface feel, dye behavior or chemical resistance.

Typical customers are mills making heat-bonded or heat-set fabrics, webbing and lace producers, footwear material suppliers and technical textile converters. We produce to order from your technical specification and are open to joint development of new materials.

Related products

Services

We insist on timely and fast service, the implementation of all-weather tracking service, adequate spare parts inventory, so that our customers have no worries.

  • Wide Variety

    Wide Variety

    Design & Manufacturing. In stock or customizable.

  • Sample and Catalog

    Sample & Catalog

    OEM/ODM available.

  • Production and Delivery

    Production & Delivery

    Flexible production and delivery policies

  • Business Experience

    Business

    Over 19 years of experience in eco-friendly textile products

Specification

ItemDetails
ProductSheath core bi-component filament yarn
StructureConcentric sheath and core; ratio adjustable by order
Core polymerCommonly polyester; other cores by request
Sheath polymerLow-melting copolymer or other functional polymer, by order
Sheath activationCommon low-melt grades bond at roughly 110 to 180 C; exact grade confirmed per project
Denier and filament countCustomized to your fabric or product
ColorRaw white or custom colors agreed before production
FormContinuous filament yarn on tubes or cones
Origin and portHaian, Nantong, Jiangsu, China; Shanghai seaport
CustomizationCore and sheath materials, sheath ratio, melting point, denier, filament count, color

Application

Sheath core yarn is chosen when a product has to hold its shape, bond without adhesive, or combine two properties in one filament. Typical uses are:

  • Heat-bonded fabrics: knitted and woven cloth that is heat set into a firm, dimensionally stable structure.

  • Webbing, tapes and laces: filaments fuse on heating, which reduces fraying and keeps cord ends neat.

  • Footwear materials: uppers, linings and reinforcement fabrics that need shape retention.

  • Technical and industrial textiles: filter fabrics, mesh and reinforcement layers where bonded filaments add rigidity.

  • Nonwoven and composite reinforcement: yarn laid into a structure and fused by heat.

  • Seams and stitching points: bonded areas that resist slippage and unraveling.

The core keeps the yarn strong after the sheath has fused, which is why sheath core yarn works better than a single low-melt polymer for most bonded products.

Advantages

  • Bonding without adhesive: the sheath acts as a built-in binder, so no separate glue or resin step is needed.

  • Strength stays in the core: the core does not melt at bonding temperature, so tensile strength survives heat setting.

  • Adjustable design: sheath ratio, melting grade, denier and color can be tuned for your fabric and process.

  • Cleaner processing: fewer chemicals and finishing steps than adhesive-based bonding.

  • Development support: an R&D department, flexible production lines and inspection after each process.

Sheath core yarn compared with common alternatives

PropertySheath core yarnRegular polyester filamentAdhesive or resin bonding
Self-bonding on heatingYes, through the sheathNoNeeds a separate step
Strength after bondingCore retains strengthNot applicableDepends on the adhesive
Extra chemicalsNone neededNoneBinder or resin required
Process controlSet by sheath melting gradeHeat setting onlyCoating and curing steps

Choose the sheath melting point with care: it must sit safely below your core and fabric tolerance, and above the temperatures the finished product sees in use.

Payment and Shipping

Payment terms

  • T/T (bank transfer) is our standard method; L/C at sight is accepted for qualified orders.

  • Deposit and balance terms are written into the quotation, so there are no surprises at shipment.

  • Sample orders can be settled by bank transfer or other methods we agree on with you.

Shipping and lead time

  • Goods ship from our factory base in Haian, Nantong, Jiangsu, with Shanghai seaport as the usual port of loading.

  • Sea freight for production quantities, express (DHL, FedEx, UPS) or air freight for samples and urgent lots.

  • Trade terms such as EXW, FOB Shanghai and CIF can be quoted according to your forwarder setup.

  • Because sheath core yarn is made to order, lead time depends on the sheath grade, denier and quantity, and is stated in the quotation.

  • Export packing is done in cartons on pallets, with labels showing denier, lot number and net weight.

We export to the United States, Germany, Japan, Spain, Italy, the United Kingdom, South Korea, Australia, Canada and many other countries. Inquiries are answered within 12 working hours.

  • Q: What is sheath core yarn?

  • A: It is a bi-component filament where each filament has a core polymer inside and a sheath polymer outside. The two parts have different properties, for example a strong core and a low-melting sheath that bonds when heated.

  • Q: At what temperature does the sheath bond?

  • A: It depends on the sheath polymer. Common low-melt grades bond between roughly 110 and 180 C. Tell us your oven or press temperature and dwell time and we will recommend a grade.

  • Q: How is it different from low melting yarn?

  • A: Low melting yarn is the family name for yarns that fuse at lower temperatures. A sheath core structure puts the low-melt polymer on the outside and a stronger polymer inside, so bonding does not cost you strength.

  • Q: Can the sheath ratio be changed?

  • A: Yes. The ratio between core and sheath can be adjusted by order. A thicker sheath gives stronger bonding, while a thicker core gives more residual strength.

  • Q: Can I get a core other than polyester?

  • A: Other cores can be discussed for specific projects, such as bi-component PE/PP or PE/Nylon structures that we also make. Share your target properties and we will review what is possible.

  • Q: Does sheath core yarn dye normally?

  • A: Dye behavior depends on the sheath polymer, because the sheath is the surface. Color can also be set at the spinning stage. Please share your dyeing process so we can match the polymer.

  • Q: Do you provide samples?

  • A: Yes. Send us your application, denier and bonding conditions, and we will arrange sample cones for trial. Our team replies within 12 working hours.

About
GC FIBER
GC FIBER has been a special textile factory in China since 2006 years. We are devoted to researching, developing, producing, and selling special and functional eco-friendly textile products.
Our products include Biodegradable Yarn, Low Melting Yarn, ECDP Yarn, Anti Static Yarn, HDPE Yarn, Bio-component Yarn, and Polyester Filament Yarn.
We are always interested in cooperating with our guests to develop new material.

WHY WE ARE SO TRUSTED

We have got a high reputation in both domestic and overseas markets.

Professional

We will communicate with customers professionally, listen to their opinions and give useful suggestions, and spend time and energy to solve every problem, no matter all the problems you encounter.

Quality

We have strict quality control requirements and the advanced testing equipment in the industry. Every process has professionals to conduct inspections to ensure product quality.

Cost

We have a number of production lines, a number of production machines, comprehensively improve product quality and production efficiency.

Design and R&D

We devote to research, development, production and sales of special and functional eco-friendly textile product.

Diversity

Our product includes PBS biodegradable product, recycled easy dyeing cationic yarn, PLA yarn, Low melting yarn, Anti-Static yarn ,PBS fiber, PLA fiber, FR nylon fiber etc.

Capacity

The company has sufficient production capacity and high control over raw material prices, quality and stable supply, which can meet the needs of customers with different procurement volumes.

Service

We insist on timely and fast service, the implementation of all-weather tracking service, adequate spare parts inventory, so that our customers have no worries.

Shipment

We are near Ningbo Port and Shanghai Port, and are very convenient and quick to transport cargo to other national capitals.

Diversified Professional Team

GC FIBER has unique sales, research and development, design, production departments and expertise to provide customers and stakeholders in various industries with specialty, functional and environmentally friendly textiles.

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