| 摘要 |
PURPOSE:To make the time-interval for the switch over of material small by a method in which the approach to the prescribed position in an extrusion cylinder of the end of the remaining material in extrusion process, is detected by the loaded current to a screw-driving motor, and then next extruding material is supplied, and remaining material and extruding material are softened without mutual mixing in the extrusion cylinder. CONSTITUTION:The approach of the end of the remaining rubber material in a hopper to an entrusion cylinder, is detected by the reduce of the detecting current obtained by a loaded current-detecting means 10. Since the detecting current is lowered according to the approach of the end of the rubber material to a head 5, said current value is compared with the current value from a current-setting means 11 by a comparator 12, and when said current value reaches at most the set current value equal to the detect current value in the time when the end of the material reaches the head, a signal is outputted to a starter 14 from the comparator 12, and a motor 15 and a feeding conveyer 8 are again operated, thereby feeding next extruding material to the hopper 4. Since the remaining rubber A and extruding material 7a are positioned with an interval, even when both materials are simultaneously softened on the basis of the rotation of a screw 3, they are not mutually mixed. |
