Eficiencia de algunas máquinas desfibradoras en la extracción de la fibra del kenaf

Abstract

In 12 tests with various defibering machines the bigbest fiber recovery was obtained by using stalks rather than ribbons and by feeding stalks into the machine so that the top ends rather than the base ends were scutched first. This procedure also gave the cleanest fiber and the fiber with the greatests strengh The machines differed in veco-very and cleanliness of fiber, not in the strengh of fiber produced Krupp-Stella type machines gave higher recovery than other machines, a difference largely associated with the feed rate For these machines, which had knife speeds of 5,000-6,000 feet per minute, feed rates of approximately 100 feet per minute were best. Cleanest fiber was obtained with knife clearances vongbly between 0.020 and 0.030 inch. Wide clearances up to 0 060 inch gave fiber with the higher proportion of nonfibrous mate-rial. No other differences in construction of the machines were observed to be as-sociated with recovery, cleanliness, or strengh of the fiber. Under the most favorable conditions of machine setting and manner of feeding more than three-fourths of the fiber in the basal 4-foot sections was recovered and only one tenth of its weight consisted of nonfibrous material.