INVESTIGATIONS OF CORE YARN PROPERTIES PRODUCED FROM CONVENTIONAL RING SPINNING FRAME USING NEWLY DESIGNED CORE YARN MECHANISM

Textile Technology

Core yarns are known as multi-component yarns in which one component, the core material, stays nearly at the center of the yarn while the others cover it. Core-spinning is a process by which fibres are twisted around an existing yarn, either filament or staple spun yarn, to produce a sheath core structure in which the already formed yarn is the core. ... Generally continuous filament yarn is used as core and the staple fibres used as sheath covering. Core spun, or “poly core”, yarn is created by twisting staple fibers around a central filament core, usually made of polyester for extra strength. It is 40% to 50% stronger than normally spun yarn of the same weight, and reduces the number of broken stitches when sewing seams and hems on denim. In this work a simple positive driven gear attachment is fabricated to provide drive to feed the core yarn to the existing drafting unit and also the effective guiding roller is also incorporated in the front drafting zone of the spinning machine to ensure the position of core yarn at the center of yarn during twisting. For producing the core yarn lycra with 7 denier is used. The core yarn of two verities has been produced (cotton sheath - lycra core, and Viscose staple staple fibre sheath – lycra core). The properties of yarn is analyzed with respect to tenacity and elongation

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