An investigation is reported of the air pressures in the conventional cotton card, measured at strategic points with the card running idle and when processing cotton. Through the utilization of a sensitive electronic instrument capable of measuring pressures of 0.001 in. of water, both static and velocity determinations were made that have given an insight into the function of air in the card and have led to the development of a method of carding without the use of the conventional revolving flats.

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Some observations were made of a card during developmental research. A reduction in air pressure above the lap feed to below zero, by means of an outside suction, affects detrimentally lickerin performance. Fiber separation in the card feed system is poorly accomplished and improvements will probably require a departure from the conventional design. A 3.6-in-diameter lickerin his about the same cleaning performance as a standard 9-in. lickerin. A 9-in.-diameter doffer cylinder with metallic closing per forms equally as well as a standard doffer, but the setting is more critical. An electro static force improves the alignment of unrestrained fibers, but practical application is difficult. Operation of a card at reduced speed shows normal performance and permits observation of the loading of the main cylinder.

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