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Sheath-Core Bicomponent Yarn

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What Is Sheath-Core Bicomponent Yarn

Sheath-core bicomponent yarn is built with one polymer forming an outer sheath that fully surrounds a second polymer core running through the center of the filament. Unlike side-by-side yarn, which is built for crimp, sheath-core yarn is generally built to give the fiber a specific surface function while the core provides mechanical strength.

This construction is flexible: the sheath can be a lower-melting polymer for thermal bonding (as in PP-PE bicomponent yarn), a polymer chosen for softness and dye affinity, or a functional layer carrying additives for conductivity, antibacterial performance, or UV resistance, while the core stays focused on tenacity and dimensional stability.

Concentric vs Eccentric Sheath-Core

A concentric structure keeps the core centered inside the sheath for uniform, all-around function, while an eccentric structure offsets the core to one side, which can be used to create self-crimping behavior similar in effect to side-by-side yarn.

GC FIBER's Approach

Because sheath thickness and concentricity directly affect bonding strength or functional additive performance, we keep tight process control on these parameters across our sheath-core spinning lines.

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

Structure TypeConcentric or eccentric sheath-core cross-section
Common CombinationsPP core / PE sheath, PET core / co-PET sheath, PET core / functional-additive sheath
Sheath/Core Ratio30:70, 40:60, 50:50 by weight (custom ratios available)
Denier per Filament1.5D – 6D (staple form); 50D – 600D (filament yarn)
Fiber Length (staple form)38mm / 51mm / 64mm, or continuous filament on request
Sheath Melting PointSet lower than core for bonding grades; varies by polymer pairing chosen
Core Melting PointSet higher than sheath to preserve structural strength during bonding
Tenacity3.0 – 5.0 cN/dtex
Elongation at Break25% – 55%
Functional Additive OptionsAntibacterial, UV-resistant, conductive, or flame-retardant additives carried in the sheath layer
ColorRaw white / dope-dyed on request
PackageBale (staple fiber) or cone (filament yarn), per customer requirement
MOQ500-1,000 kg per specification depending on polymer combination and form

Application

Because the sheath can be engineered for a specific job while the core supplies strength, sheath-core yarn shows up across a wide range of technical and functional textiles:

  • Thermal-bond nonwovens: low-melt sheath fiber used across hygiene, medical, and filtration nonwoven fabrics.
  • Functional apparel fiber: antibacterial, UV-resistant, or moisture-management sheath layers over a strong PET core.
  • Conductive and anti-static fiber: a conductive sheath layer used in workwear, cleanroom garments, and anti-static fabrics.
  • Carpet and brush filament: a durable core with a softer or more dye-receptive sheath for surface appearance.
  • Geotextiles and industrial fabrics: where the core must resist mechanical load while the sheath manages surface bonding or chemical exposure.

Advantage

  • Function and strength in one filament: the sheath handles a specific surface job while the core keeps overall tenacity high.
  • Highly customizable sheath layer: we can adjust the sheath polymer or additive package to target bonding, antibacterial, UV, or conductive performance.
  • Efficient use of functional additives: concentrating additives in the sheath instead of the whole filament can improve cost-efficiency versus additive-blended homogeneous fiber.
  • Stable core mechanical properties: the core polymer and ratio can be set to protect tenacity and dimensional stability even when the sheath is optimized for a different function.
  • Precise sheath thickness control: as the manufacturer, we hold sheath/core ratio consistent, which is critical for both bonding strength and functional additive performance.

Payment Terms

We accept T/T (30% deposit, balance before shipment or against copy of B/L), L/C at sight for bulk container orders, and Western Union / PayPal for sample orders. Quotations are given in USD by default.

Shipping & Delivery

Standard terms are FOB Shanghai / Ningbo, with CIF and DDP arranged on request. Samples ship by express courier within 3-5 working days. Bulk production lead time is generally 15-25 days after deposit and specification confirmation, shipped by sea freight (FCL/LCL), with air freight available for time-sensitive orders.

  • Q: What is the main purpose of a sheath-core structure compared to a blended fiber?
  • A: A sheath-core structure lets the sheath carry a specific surface function, such as bonding or antibacterial performance, while the core is dedicated to mechanical strength, which is more efficient than distributing everything through a single blended fiber.
  • Q: What is the difference between concentric and eccentric sheath-core structures?
  • A: A concentric structure keeps the core centered for even, all-around function such as uniform bonding, while an eccentric structure offsets the core to create a self-crimping effect similar to side-by-side yarn.
  • Q: Can you add functional additives like antibacterial or UV-resistant agents to the sheath?
  • A: Yes, functional additives can be compounded into the sheath layer, and we can discuss additive type and dosage based on the performance standard you need to meet.
  • Q: Is sheath-core yarn only used for bonding fiber?
  • A: No, bonding is one common use, especially with a PP core and PE sheath, but sheath-core structures are also used for functional apparel fiber, conductive fiber, and carpet filament, depending on the polymers and additives chosen.
  • Q: What is the minimum order quantity for a custom sheath-core combination?
  • A: MOQ is generally 500-1,000 kg depending on the polymer combination and fiber form, though we're glad to discuss smaller trial batches for new functional fiber development.
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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