The 'UNILAB' Twist Tester for yarns consists of a set of clamps, one of which is rotating and the other fixed.  The rotating clamp is driven by hand through a speed increasing arrangement and a five digits re-settable revolution counter to count the number of twists.  The fixed clamp is pivoted on jewel bearings and carries of a pendulum arm having a sliding weight to give the desired tension to the yam. The fixed clamp assembly can be moved over a guide bar for setting the required test length of yam which is indicated on a strip scale fixed to the base against a pointer attached to the moving assembly.  A viewing plate and a magnifying glass are provided for accurate determination of the end point.  A dissecting needle for ascertaining complete removal of twist is supplied as standard accessory with the equipment.  The various components are fixed on a rigid cast iron base for strength and durability.  The base is finished in off white synthetic stoving enamel paint and all parts bright chrome plated to give a corrosion resistant finish and highly aesthetic appearance.

The motorised version of the tester is also available using a universal motor and a direction changing mechanism for selecting proper untwisting direction check.

TECHNICAL DATA

Test Length                              :            25 to 250 mm (25 to 500 mm for motorized version).

Load on test specimen           :            0 to 100 g.

Counter                                     :            Five digit revolution counter too give S twist directly and Z twist by subtracting from 100,000.

RELATED STANDARDS

IS 832 – 1985                            :            Method of determination of Twist in yarn.

BS 2085 – 1973               :            Determination of twist in Yarn by Direct Counting Method.

ASTM D 1423                            :            Determination of twist in Yarn by the Direct Counting

Method.