JUST MACHINE TOOLS
YARN EVENNESS TESTER

YARN EVENNESS TESTER

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  • Visual determination of unevenness along the length of a yarn is carried out by wrapping it in equally spaced parallel wraps over a board and comparing the appearance of irregularities against standard rating photographs.

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  • To enable yarns of different thickness to be assessed, the spacing between the warps is suitably selected so as to give a clearly distinguishable pattern.

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  • The   Yarn Evenness Tester consists of a yarn warp board and an arrangement to wrap the yarn over it at equal spacing under a desired tension. The board is rotated manual to warp yarn over it. The yarn is guided on to the board through a yarn guide, which moves parallel to the pivoting axis of the board with the help of a screw giving uniformly spaced wraps. The guide is positively linked to the rotation of the board with the help of a chain and sprocket drive. A set of change gears gives five different spacing for wrapping yarn of different counts. A spring loaded adjustable tensioning arrangement provides the desired tension to the yarn.

  • Related standard

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  • ASTM  D 2255 – 1964 : Standard Method for Grading of Cotton Yarns for

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