Abstract
A photometric technique is used to measure the dynamic swift-to-doffer transfer efficiency of wool fibres in a miniature card under equilibrium running conditions. The results show that transfer efficiency is mainly a function of doffer loading, with the efficiency decreasing as the doffer loading increases. Fibres that have already passed by the doffer once are more difficult to remove in subsequent passages past the doffer. As a result, for a given loading, the transfer efficiency of the second doffer in a double-doffer card is less than that of the first. Furthermore, the transfer efficiency of a card under equilibrium running conditions cannot be reliably measured by the commonly used technique of interrupting the card feed and monitoring the decay in swift loading or sliver density.
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