How does the texturing process work to create the low elasticity in polyester yarn?

Polyester yarn stands as a stalwart in the textile industry, renowned for its durability, versatility, and ease of care. Among its variations, polyester low elastic yarn, or DTY (drawn textured yarn), holds a distinctive place, prized for its reduced elasticity and enhanced stability. At the heart of this specialized yarn lies the texturing process, a meticulously controlled procedure that transforms standard polyester filaments into low elastic wonders.
Preparation: Drawing the YarnThe journey of creating polyester low elastic yarn begins with drawing. During this phase, the polyester yarn is subjected to a stretching process that aligns its polymer chains, enhancing its tensile strength and elongation properties. This drawn yarn serves as the raw material for the subsequent texturing steps. Heating: Softening the YarnOnce drawn, the polyester yarn undergoes controlled heating. This heat softens the yarn, rendering it more pliable and receptive to the texturing process that follows. Whether through hot air or contact with heated surfaces, this step lays the groundwork for the intricate texturing that lies ahead.
Texturing: Introducing IrregularitiesThe crux of creating low elasticity in polyester yarn lies in the texturing phase. Here, the softened yarn encounters a texturing device, where it undergoes a transformation. Various methods are employed, including high-speed air jets, mechanical interlacing, or false twisting, each designed to introduce irregularities or crimps into the filament. These irregularities disrupt the alignment of the polymer chains, reducing the overall elasticity of the yarn.
Cooling: Setting the StructureFollowing texturing, the yarn is swiftly cooled to set its new structure. This crucial step ensures that the introduced irregularities are locked in place, stabilizing the yarn's reduced elasticity. Rapid cooling prevents the polyester low elastic yarn from reverting to its original state, ensuring that its newfound properties are retained.
Winding: Ready for Further ProcessingWith the texturing process complete, the polyester low elastic yarn is wound onto spools or cones. This winding prepares the yarn for subsequent processing or distribution, where it will find its place in a myriad of textile applications.