weaving

How a Spinning Mill Works (Complete spinning mill process)

This is a process of converting raw cotton into a more usable form.

In the first stage, raw cotton is mixed with water in order to remove dirt and impurities. The mixture is then sent through a series of machines called ‘blow room’ and ‘carding’. In the blow room, air is blown to make the cotton fluffy. This process makes it easier for the carding machine to separate out fibers of different lengths. The carded fiber is then compressed into slivers which are spun together to form yarns.
Spinning is a process that converts raw materials, such as cotton, wool, or flax, into a continuous strand of yarn. The process is carried out in four steps: carding, drawing out, spinning and twisting.

Below are the details of some major sections or departments used in a spinning mill to convert the fiber into yarn.

CARDING
In the carding process the raw material is first broken down into small pieces and then it is cleaned from the impurities like trash, dead fiber, dust and dirt. After this cleaning process the cleaned cotton is converted into sliver form. This sliver is stored and carried forward to the next section in canes.

DRAWING
The carding machines separate the raw material into a web of long fibers called sliver. The process starts by drawing slivers from the carding machine. The slivers are then taken to the drawing machines where this sliver is reprocessed to make it softer, straight and variation is decreased by using several canes of sliver into one row.

COMBERS
It is a process in which the fibers are passed through a series of rotating brushes. The brushes pull out the shorter fibers and leave behind the longer ones, which are then wound onto bobbins in the forms of laps.
The most common type of machine used for combing is called a comber.

SIMPLEX
The simplex frames pull the slivers out to make them thinner and longer, while being twisted together to form roving.

RING
The roving is then taken to the spinning frames where it is stretched out and twisted together even more tightly to produce yarn. In the spinning mill process, yarn is spun into thread by a spinning machine. The spinning machine is called a ring frame and it includes four parts: the spindle, the flyer, the bobbin and the doffer.
The spindle is attached to a rotating drive shaft that is powered by an electric motor. The flyer is a large rotating cylinder with many slots in it that catches thread as it comes off of the spindle. The bobbin holds all of the thread coming off of the flyer and stores it until it can be wound onto a small container called bobbin

AUTO CONE / WINDING
Then the yarn bobbins are converted into big yarn cones to their final shape.

PACKING DEPT
Then these cones are brought to the packing department. Packing is being done in both mechanical and manual form. most common packing are carton packing, PP bag packing and pallets.

Author: Afzaal Khadim Khan
Owner: Textiles Bar
Lahore Pakistan

What is difference between Open End and Autocoro Yarns.

There is no major difference between open end and autocoro yarns. The simple difference is that auto coro yarn is produced on latest machines with same manufacturing system while open end yarn is produced on old open-end machines.

Open End machine is the older version of machines. It can mostly not produce finer or higher number of counts above 20/1 oe although We can produce up to 30/1 on open end machines but we have to decrease the machine speed which decrease the production and increase the production cost. Mostly coarser counts from 6/1 oe to 16/1 oe or 20/1 oe is produced on it.

Auto Coro is the latest machine having the ability to produce yarns of fine quality with higher speed. its count range is also higher and its drafting system allow you to produce yarn counts up to 60/1 although mainly people prefer to produce yarn counts till 40/1. Autocoro production capacity is also very high as compare with open end machine.

Hope you have under stood the difference in open end and auto coro yarns. In case of any confusion please drop your question in below comments section.

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