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The count of yarn is defined as a number indicating its weightage. In direct system the count is the weight of a unit length of yarn; for example Tex is the weight in gram of 1000 meter length of yarn, Denier is weight in gram of 9000 meter of yarn. In indirect systems the count is the number of units of fixed lengths of yarn which make a fixed weight: for example Cotton is number of hanks in one pound weight of yarn, Metric is number of kilometer in one kilogram of yarn etc.
Irrespective of the system of count, two basic requirements for determining count are - an accurate determination of sample length and an accurate determination of its weight.
The method of determination of count depends to a large extent on the form in which the yarn is avail- able for testing. When yarn is in the form of a bobbins, a known sample length is taken by forming a skein or lea on a wrap reel. The skein or lea is then suspending from the hook of a quadrant balance. The count is read directly on the scale attached to the balance.
When the warp and the weft count of yarn from fabric specimens is required, the fabric is cut into a specified length with help of a template. Yarns are then removed from the specimen and suspended from a hook. The total number of yarn lengths that are required to balance a standard weight on the beam directly gives the count of yarn. This measurement is carried out with the help of a Beesley Balance.
The Beesley Balance consists of a lightweight beam pivoted on jewel bearings with a hook at one end and a pointer at the other. The beam is initially leveled to make the pointer coincide with a datum line. A rider of a standard mass is suspended from a notch on the beam arm on the pointer side.
A template is used to cut short lengths of yarn, the length depending upon the count system required. These short lengths are placed on the hook until the tip of the pointer coincides with the datum line again. The number of short lengths required for balancing the beam gives the count of the yarn.
The balance is housed in a sheet metal box having sliding transparent acrylic doors to keep it free of air draughts. It is finished in stoving painting and bright chrome plating to give it a corrosion resistant finish.
A brass template is provided to give lengths of yarn in Metric, Cotton, Linen, Wool Skein, and Worsted counts.
PRECISION JEWEL BEARING
20â X 9â X 7â
SKGS ASTM D 2260 / 852865 / ISO 7211-5
GREY / METTALIC BLUE
METALLIC CHROME LEVELLING SCREW