Controlling device and method for extruder

摘要

Controlling device and method for an extruder which can continuously process materials of different kinds without burning a following material and without causing variation in physical properties by allowing the following material to succeed to a preceding material without running out of sheet when the materials are replaced. In an extruder in which a roller die 2 having upper and lower parallel rollers 9 is arranged in front of an outlet of an extruder body 1 rotatably including screws 3 for extruding material and a bank portion 12 surrounded by the upper and lower rollers 9 and a side guide 20 closing both of right and left sides of the outlet 7 is formed, the roller die 2 is once stopped when the quantity of the bank portion 12 reaches the bank quantity which is the minimum for the preceding material to be extruded to be succeeded by the following different material to be extruded. After that, the roller die 2 is again activated when the following material reaches a predetermined bank quantity in the bank portion 12.