Semi Worsted System Spinning of the Carpet yarn

In a semi worsted-spinning system the wool web is collected in a Can. This carded sliver is passed to intersecting gill box machine. Conventionally there are three intersecting gill boxes and one auto leveller. The theory of semi worsted lies behind drafting of this carded sliver.

The auto leveller is a machine which regulates the sliver output by varying the speed of drafting shafts. The sliver before feeding into gill box is being passed through sensor rollers which are linked with a delayed mechanism properly configured to increase or decrease the draft of the sliver measured in reference to standard set.

Normally 15% plus and 15% minus variation is controlled in an Autoleveller.

After Auto leveller the next process is Pin-roving machine, which not only reduces the sliver but also rubs the sliver to provide it some strength to ease at spinning frame. This is also called as apron drafting roving machine.

The sliver of pin roving machine is then passed to spinning frame, which is further drafted into required count of woollen yarn. After spinning the yarn is converted to hanks or passed to twisting frame as per requirement of customer.

In high speed spinning system the sliver is directly fed into spinning frame of high drafting ratios eliminating need of roving frames to reduce the sliver.