Abstract
ABSTRACT Three different pressure measuring devices were evaluated for providing pressure-time data in a continuous rotary press by passing them through the press with the feed material. The press was of a belt-and-drum configuration and was used to form macerated alfalfa into mats for fast field drying. The pressure measuring devices were: 1) a fluid-filled tube connected by a capillary tube to a large, remote, commercial pressure transducer; 2) a miniature diaphragm (3.5 mm dia.) transducer; and 3) a pressure sensitive film, the final color density of which corresponded to the maximum pressure to which each point on the film had been subjected. While the first two measuring devices provided the relative pressure distribution in the press, they exaggerated the pressure magnitude making it necessary to scale their output by use of the pressure sensitive film or by use of equilibrium requirements of a free body diagram of the press.
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