SPINNING TEXTILES BASICS AND UPDATES

DRAW FRAME AUTOLEVELLER  Autoleveller is an additional device which is meant for correcting the linear density variations in the delivered sliver by changing either the main draft or break draft of the drafting system, according to the feed variation. There are two types of Autolevelling systems. They are ⦁ Open loop system  Open loop system ⦁ closed loop system  Closed loop system drawframe working principle Most of the drawframe autolevellers are open loop auto levellers.  In open loop autolevellers , sensing is done at the feeding end and the correction is done  by changing either a break draft or main draft of the drafting system. In closed loop system, sensing is at the delivery side and correction is done by changing either a break draft or main draft of the drafting system. Most of the earlier card autolevellers are closed loop autolevellers. But the latest cards have sensing at the feed rollers and as well as at the delivery calender...

Carding Technology Basics  INTRODUCTION "Card is the heart of the spinning mill" and "Well carded is half spun" are two proverbs of the experts. These proverbs inform the immense significance of carding in the spinning process. High production in carding to economize the process leads to reduction in yarn quality. Higher the production, the more sensitive becomes the carding operation and the greater danger of a negative influence on quality. The technological changes that has taken place in the process of carding is remarkable. Latest machines achieve the production rate of 60 - 100 kgs / hr, which used to be 5 - 10 kgs / hr, upto 1970. THE PURPOSE OF CARDING: 1.       to open the flocks into individual fibres 2.       cleaning or elimination of impurities 3.       reduction of neps 4.       elimination of dust 5.       elimination of short ...

Yarn count and yarn numbering system Definition The count of a yarn is a numerical expression which defines its fineness. It is also called as yarn number or liner density. It is also called as yarn diameter. The fineness of yarn cannot be expressed easily inter-mesh of diameter as in case of wires or rods. The instrument such as micrometer cannot be used to determine the diameter of yarn. Therefore special methods are used to determine the fineness or coarseness of yarn. System of yarn numbering According to the definition given by the textile institute count is a number indicating the mass per unit length or the length per unit mass of yarn. Several systems and unit are used for expressing the yarn number. Indirect system of yarn numbering In this system: 1.      The count is the number of units of length per unit of weight of yarn. 2.      Higher the count finer is the yarn. 3.      This system is general...