Download Advances in Yarn Spinning Technology (Woodhead Publishing by Carl Lawrence PDF

By Carl Lawrence

This publication offers a useful unmarried resource of knowledge at the advances in yarn spinning applied sciences. complex spinning structures are defined and comparisons are made from the homes of the yarns produced, and resultant accomplished items, with these from traditional platforms. half 1 offers an creation to yarn fiber spinning and constitution. Chapters speak about the rules of ring spinning and open-end spinning of yarns. Yarn constitution and houses from diverse spinning options and yarn structural standards for knitted and woven materials also are tested. half 2 covers advances specifically yarn spinning applied sciences. themes variety from siro spinning to compact spinning know-how and air-jet spinning. ultimate chapters discover the right way to reduce fiber harm which may ensue in the course of spinning and using spin finishes for textiles. With its uncommon editor and array of overseas participants, Advances in Yarn Spinning expertise is a crucial textual content for spinners, yarn brands and upholstery manufacturers, in addition to researchers, technicians, engineers and technologists during this region of the fabric undefined.

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7 Wrap spinning methods Besides the use of twist to consolidate the drafted ribbon of parallel fibres that constitutes a spun structure, surface fibres protruding from the ribbon or a continuous filament (or filaments) can be made to wrap (or bind) the fibre assembly to form a yarn with usable strength. 1 Surface fibre wrapping Two techniques are used: friction spinning and air-jet spinning. 21 In-phase and 180° phased ST yarn structures. Friction spinning With this technique a ribbon of fibres is fed from a roller drafting system along the V-shaped groove formed by the rotating friction drums.

E. friction spinning. Overview of developments in yarn spinning technology Yarn package winding 31 32 Advances in yarn spinning technology developed which simulate a two-fold yarn using the ring spinning method. These usually involve feeding two rovings to each spindle position and employing a threading geometry so that in the spinning zone twist enters the individual drafted ribbons (or strands) as well as plying them together: see Chapter 6. The actual twist structure of these yarns, however, differs from that of a plied yarn, in that the direction of twist is the same in the strand and the resultant yarn, whereas with plied yarns the twist direction in the singles component will be opposite to that of the resulting ply.

At the start of twisting, Z-twist8 will be inserted in the strand as it passes through zone AX, and S-twist inserted as it moves through zone XB. As time passes, the degree of Z-twist will increase to a constant value of N/V per metre. 19 False twist principle. 6 A yarn that has excessive tendency to twist around itself if held with insufficient tension. 7 The tendency for the rows of interlinked loops (the course) running the width of a weftknitted fabric to distort from their intended horizontal positions.

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