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The best&most even sliver is produced by feeding the card always the same quantity of material,CARD AONTROLLCIIlis NEW CLOSED LOOP CONTROL syatem,measure fuft wed thickenss and do not only regulate but actually control the process and ensure a uniform card feed by presenting to the licker-in cylinder always the same amount of fibers&also measure sliver thickness and converts this into an electrical sigal,there is an instantaneouscorrection of the feed roller speed,this correction is superimposed on the basic speed of the feel roller and the correction carrection carried out by the sliver. Card in installation line between sliver cv% within:1.8%.