Fig. 1 Pneumatic epurator

The purpose of the conveyor that transports the material from the breaker card to the intermediate card is precisely to feed the web to the second machine, by means of condensation on an endless tape doubled with other tapes, in such a way that the fibres are overlapped forming a criss-cross effect with the feeding direction. This method of feeding the intermediate cross card creates a more intense carding effect and better blending of the material, particularly important when processing blends with a heterogeneous composition and many colours: indeed, in this way, any stripes of colour that are present are distributed across the whole width of the machine and the fault is better compensated for. This card is entirely equipped with flexible clothings and can be made up of one or two drums, according to processing requirements.
When it is delivered by the intermediate card the web passes through the epurator (Figure 1), which is made up of two hardened, ground and polished steel rollers, subjected to pressure by two pneumatic pressure devices, acting on the pins of the upper roller. This passage through the epurator results in the elimination (through the pressing effect of the rollers) of further impurities, increasing the web cleaning action crucial for optimal processing.