| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for continuously adding a powdery additive to an olefinic resin and continuously detecting fish-eyes to obtain the olefinic resin reduced in the number of fish-eyes, a method for detecting the fish-eyes in the olefinic resin, and a method for manufacturing the olefinic resin reduced in the number of fish-eyes. SOLUTION: The powdery additive is added to the olefinic resin by operating the sound transmitter arranged to the powdery additive feeder or hopper of an extruder for the olefinic resin at a constant operation interval for a definite operation time. The method for detecting the fish-eyes in the olefinic resin, an adding method for feeding back the detection result, and the method for manufacturing the olefinic resin using these methods, are also disclosed. |
