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1 Backwashing
When the scoured wool has been thoroughly opened in the carder, it is generally somewhat dingy in colour - due to dirt which has not been removed in the scouring bowl, owing to the stapled condition of the material. The function of the backwash is to effect the removal of this, along with any dust, dirt, etc., collected while the material has been passing through the carder. In recent arrangements this machine receives the slivers after they have been delivered into cans or made into balls by the card or the preparing gill boxes. After passing through the wash bowls, squeezing heads, and drying chamber, the sliver is carried into a suitable gill box situated at the end of the drying chamber. The wool is then ready for further gilling before being made up into balls for the combs. -
2 Worsted, Backwashing
WORSTED, BACKWASHINGWhen scoured wool has been partly processed, it undergoes a further washing process carried out to give the wool the cleanest possible appearance. This process is known as back-washing, and is carried out on wool in sliver form, e.g., carded, prepared or combed. The machine has two bowls, the first with a weak alkali detergent to cleanse the wool, and the second bowl to rinse and wash away dirt, etc. The slivers are fed to the machine from cams and after washing and drying are passed through a gill-box. If backwashing precedes combing a small percentage of oil may be added to the wool after washing and prior to entering the pins of the gill.Dictionary of the English textile terms > Worsted, Backwashing
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