Manufacturing of Woolen Yarns |Manufacturing of Worsted Yarns
Manufacturing of Woolen Yarns |Manufacturing of Worsted Yarns: Now, we would learn the steps involving in the manufacturing process of worsted yarns. These steps are mentioned in below.
|Gilling and combing|
A short explanation of the above process steps is given below
The process of carding for the manufacturing of worsted yarn, projected to disentangle. And lay them as parallel as possible. The fibres are passed between rollers roofed with fine wire teeth. Since worsted yarns, however, must be smooth, the fibers are prepared to lie as parallel as this process will permit. After this process, the wool goes to the gilling and combing procedures.
Gilling and Combing:
Gilling is dispensed before (preparative gilling) and after (finisher gilling) combing. The preparative gilling is especially to align the fibers during a parallel direction, further blend the wool through doubling and to feature moisture and lubricants. Whereas finisher gilling is especially aimed to get rid of the mild entanglement introduced to the combed sliver. The carded wool, which is to be made into worsted yarn, is put through gilling and brushing operations. The gilling process eliminates the shorter staple and straightens the longer fibers. This process is sustained within the combing operation, which eliminates the shorter fibers of 1 to 4 inch (25 – 100 mm) lengths (called combing noils), places the longer fibers (called tops) as corresponding as possible, and further cleans the fibers by eliminating any remaining loose impurities.
Drawing is a sophisticated process which doubles and redoubles slivers of wool fibers. The method draws, drafts, twists, and winds the stock, making the slivers more compact and thinning them into slubbers. Drawing is finished just for worsted process.
This is the ultimate stage before spinning. Roving is truly a light-weight twisting operation to carry the skinny slubbers intact.
The type of spinning described here is appropriate for both worsted and woolen yarns. Within the spinning process, the wool roving is drawn out and twisted into yarn. There are two main approaches accustomed produce woolen-spun yarns. These are:
- Ring spinning
- Mule spinning
Mule-spun yarns usually are superior to ring-spun yarns but they have an inclination to be rather more costly thanks to the slow production rates and high labor input.
Worsted yarns are spun on any quite textile machine – mule, ring, cap, or flyer. The 2 principle systems of spinning worsted yarns are country system and therefore the French system.
- In the English system(Bradford), the fiber is lubricated before combing, and a good twist is implanted. This yields smoother and finer yarns. The more compactly twisted yarn makes stronger, more durable fabrics.
- In the French system, no lubricant is employed. The yarn is given no twist; it’sfuzzier, and so appropriate for soft worsted yarns.
In the production of woolen yarns, the fibers always undergo two steps such as:
The purpose of carding operation is to unravel the fibers. During this procedure the wool fibers are passed between rollers roofed with thousands of fine wire teeth. The wool fibers are unraveled by the action of the wires and are set in parallel fashion. This makes the woolen yarns smooth. Since the assembly of woolen yarns is meant to be rough or fuzzy, it’s not desirable to possess the fibers too corresponding. By use of an oscillating device, one thin film, or sliver, of wool is positioned diagonally and overlapping another sliver to allow a crisscross effect to the fibers. This process helps in gaining a fuzzy surface on the yarn.
The next stage is spinning which is analogous to it of worsted production process. We might learn the spinning process is that the next section.
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