Rieter

Cleaning positions in front of the flats

Index

Illustrated by the Rieter TREX system

The remaining impurities in the material on the  cylinder, and a large proportion of the dust, can be removed only by way of total opening of the raw material, i.e. absolute separation of the fibers.

This degree of opening is achieved practically only once in the spinning process, namely on the card cylinder (similarly also in rotor spinning within the spinning unit). This position is therefore ideal for the finest cleaning.

The slotted grid beneath the cylinder that has been used formerly is not suited to this purpose. Mote knives are better. They have been in use for a long time at the cylinder (above the doffer) in the form of stripping blades for the flats, but they have never been properly exploited for cleaning.

For several years now, the manufacturers of cards have used assemblies better suited to this purpose, e.g. the Rieter company’s TREX system (Fig. 114). Beneath the flats cover is a mote knife, set close to the cylinder; this knife is associated with a suction tube. Foreign matter stripped from the cylinder surface passes into the tube and is carried away.

Nowadays it is nearly standard to have assemblies comprising carding plates and mote knives (behind each other) above the doffer.

Fig. 114 – Rieter TREX system a) above the licker-in; b) above the doffer