The effect of many factors on the pick up characteristics of chopped straws was investigated and discussed with regard to both the fixed knives and the freeswinging flail knives. Both the rotating speed of knives and the inclination angle of the chute are the very influential factors in determining the pick up ratio. In addition to these factors, the chopped straws length, the clearance between knives and rotor housing, the distance between knives, the knife width are effective carried out. In the first part of this study (Matsuo and Nguyen, 1978). Obtaining a basic knowledge of the pick up characteristics of the chopped straws is the first step toward a better design procedure.
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