What is Carding?
Carding is a mechanical process that separates locks and unorganized clumps of fiber and then aligns the individual fibers so that they are more or less parallel with each other. It is the core of the spinning process that dictates the quality of yarn and the end product. Carding is the most important process in spinning. It is called the heart of the spinning process. In this article, we will discuss the necessary formula for carding operation in Ring Spinning.
Necessary Formula for Carding Operation in Ring Spinning:
……………….Draft constant……….Delivered length
1. Draft = ………………………… = ………………………….
………………………D.C.P.………………..Feed length
……………………………Wt of material feed/yd
2. Total draft = ………………………………………………
…………………………Wt of material delivered/yd
……………………….Hank delivered
3. Actul draft = ………………………….
……………………………Hank feed
………………………………………………………….Present hank
4. Required D.C.P. = Present D.C.P. x ………………………….
…………………………………………………………Required hank
……………………………………………………………Required wt/yd
5. Required D.C.P. = Present D.C.P. x ………………………………….
……………………………………………………………..Present wt/yd
………………………………………………………….Present draft
6. Required D.C.P. = Present D.C.P. x ………………………….
…………………………………………………………Required draft
…………………………Total draft x 100
7. Actual draft = ……………………………
…………………………….100 – waste%
………………………………………………………Present D.C.P.
8. Required draft = Present draft x ……………..……………….
………………………………………………………Required D.C.P.
……………………………………………………………..60……………….1
9. Production/hr = Doffer r.p.m. x dia x p x…… x ………………………. x Efficiency x Waste%
……………………………………………………………..36…..840 x Sliver hank
………………………………..Surface speed of delivery roller (faster)
10. Technical draft = ……………………………………………………………..
…………………………………..Surface speed of feed roller (slower)
………………………….Linear density (Tex) of input materials (lap)
11. Actual draft = ……………………….…………………………………………….
…………………………Linear density (Tex) of output materials (sliver)
….Feed wt (grams) / Unit length
= …………………………………………….
……..Delivery wt. / Unit length
…..Delivery length (m) / Unit wt.
= …………………………………………….
…………Feed length/Unit wt.
12. Total draft = Main draft x Web draft
Author of this Article: Abdullah Nur Uddin Rony Textile Engineering College, Noakhali Facebook: Abdullah Rony