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...

Draw frame Functions Draw Frame  Basics for spinning Technicians Drawing is the operation by which slivers are blended, doubled and leveled. In short staple spinning the term is only applied to the process at a draw frame. In drawing slivers are elongated when passing through a group of pair rollers, each pair is moving faster than previous one. This permits combing, drawing and elongating of several slivers to make them strong and uniform.In most modern worsted drawing sets there are 3 passages of pin drafting and roving process. Objects of drawing: To straighten the crimped, curled and hooked fibers. To make the fiber parallel to their neighbors. To improve uniformity of fibers by drafting and doubling. To reduce weight per length unit of sliver. To remove dust from slivers. To blend raw material of same hank perfectly. TASKS OF DRAWFRAME 1. Through doubling the slivers are made even 2. doubling results in homogenization(blending) 3. through draft fibres get p...