It is easy to ignore details, when looking at the larger picture. On the contrary, when a fabric is ready to be turned into a garment or any other use, the details regarding the yarn and finishes become all the more pertinent. In fact, details are today's guide to everything from style to grace. Noticing the finesse that goes into making a garment also involves the quality of yarn. The texture of fabric is decided on the basis of yarn and fibre quality and the process of carding is important from this perspective.
In the carding process, the fibres are separated and then brought together into a loose strand (sliver or tow). The process involves use of machine that splits up the locks and tangled clumps of fibre and then lines up each fibre so that all the fibres are almost parallel with each other. The carding machine contains a single large roller that is surrounded by small rollers. The rollers are enveloped with small spikes.
As the process progresses, the yarn is turned finer by the spikes. Silver looking large rope of fibres are formed by the process. The process of carding can also be used to make blended fabrics involving different types of fibres and colours. This process is important in spinning process of various types of fabrics especially in woollen spinning cycle. In case of woollen spinning, carding process helps in attaining the level of quality that the manufacturer wants.
The carding machine used in woollen spinning is more on traditional side, as the cylinders are covered with clothing angled at different degrees. These cylinders rotate at varied speeds, controlling and influencing three cardinal actions: carding, stripping and raising. When properly combined, the clumps are opened and the fibres are separated from the clothing.
Speaking extensively, carding process signifies the processes of willowing (wherein fibres are loosened), lapping (wherein the dust is removed), carding (untangling the tangled yarn) and drawing (the final process of quality improvement in the spinning mill). The carding process gets rid of impurities, further blends the raw material, lessens the blend to a fibre mesh and divides it into rovings of the required count, which are suitable for feeding to the spinning machines.
On the flipside, at times carding process can result in nep formation i.e. formation of small entanglements of fibres that cannot be untied. The nep can be formed, following insufficient stripping, dirty grid bar, rough flats settings, high speed of roller and if under-casing is blocked by waste. Poor flat stripping can also result in holes or patches in card web. Carding can also result in high sliver variation, which is mainly due to disparity in draft between cards.