| 摘要 |
PURPOSE:To utilize the waste heat of the cylinder to dry and preheat resin and improve the economic property of the extruder by a method wherein the exhaust port of a cylinder cover and the interior of a resin supplying hopper are communicated. CONSTITUTION:Hot wind discharged from the exhaust port 15 is introduced into the resin supplying hopper 9 by a blower 17 through a communicating duct 16 and dries and preheats the resin in the resin supplying hopper 9. In this case, the heat capacity of the hot wind discharged from the exhaust port 15 is different in accordance with the revolving speed of a screw in the cylinder 8, however, a driving motor for the blower 17 is controlled at a revolving speed in accordance with the revolving speed of a driving motor for the screw and the blower induces the heae capacity of the hot wind which is suitable for the revolving number of the screw, therefore, the most suitable hot wind temperature may be obtained. When the temperature in the communicating duct 16 has become higher than a predetermined temperature, a temperature indicating and adjusting meter 20 adjusts a wind volume adjusting valve 21 in accordance with a signal from a thermometer 19 and the hot wind of a constant temperature is introduced into the resin supplying hopper 9 at all the times. |
