Abstract
Sewing threads are specially engineered threads designed to meet the requirements of the end product, playing a crucial role in determining the overall performance in terms of strength, durability, and usefulness of the substrate. Despite their consumption being less than 1% of the textile to be sewn, sewing threads hold considerable importance, finding applications in various technical textile sectors such as Indutech, Hometech, Meditech, Sporttech, Protech, Packtech, Clothtech, etc. This paper introduces different types of sewing threads, covering their compositions, specifications, properties, and various end-use applications.
Introduction
The history of sewing threads dates back 2500 years when threads were crafted from animal hairs through rubbing and twisting. Subsequently, materials like jute, silk, linen gained usage, followed by the popularity of cotton threads. In the contemporary era, synthetic threads are specially engineered to meet the functional requirements of end products.
Processes and materials for joining depend on the structure and properties of the substrate being joined. Stitched seams dominate due to their flexibility, extensibility, and versatility across various substrates. Other joining processes like fusing, adhesive sealing, and welding are limited to specific thermoplastic substrates.
Sewing threads, defined as smooth, evenly spun, hard-twisted ply yarn, undergo a special finishing process to resist stresses during sewing operations. They form seams that ensure uniform stress transfer between substrate components, preserving the overall integrity of the assembly.
Threads designed for high-temperature applications, ranging between 260�C to 1100�C, are made from materials such as glass, carbon, polytetrafluoroethylene, steel, and aramid fibers. For low-temperature applications, materials like Polyesters, Polypropylene, Nylon6, Nylon6.6 are commonly used in industries like car upholstery, leather, and packaging.
Medical sutures, designed for wound closure, are specially crafted and sterilized to meet stringent end-application requirements.
The authors are associated with Wool Research Association, Thane.
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