49 (#91) ############################################## CARDING AND CONDENSING (B) The passage through the card involving :- (1) Carding, (2) Stripping, and (3) Passing forward, constitute the most important series of operations which the student of carding has to study. The passage of wool through a worsted carder is carefully considered on pages 218-220, “Wool Carding and Combing but carding is a much more important matter to the woollen spinner than to the wool comber, consequently deeper insight must here be attempted. The action of card wires spoken of as the “carding action is that effected by means of the old hand-cards when these are drawn in opposition to one another- point to point. But with hand-cards this action is necessarily intermittent-with rollers clothed with wires having the correct inclination and revolved in the required direction, the operation is continuous. This action is the basis of woollen carding, the swift (A) Fig. 16 meeting the worker (B) point to point and more or less effectively carding the wool. On a card wherever swift and workers meet there is true carding taking place- more or less severe according to (a) The relative speeds of the cylinders ; (6) Distance apart of the cylinders; and (c) The card clothing densities. With reference to (a) the relative speeds of the two cylinders will depend upon whether the worker is Stationary, or Revolving in the same direction as the swift, its teeth act against the teeth of the swift; or Revolving in the opposite direction to the swift, its teeth as it were retiring from the swift. The first condition is almost obtained in the flat cotton card, but as the idea of the roller card is to attain E 49
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