| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for removing stain caused by a polymer attached to a nozzle regardless of a kind of polymer. SOLUTION: A nozzle is cleaned by ultrasonic wave in a dispersion containing >=0.05wt.% and <=5wt.% of abrasive grain which is particles having a maximum point in the range of 9-18μm in a particle size distribution curve shown by the volume of falling solid particles by a centrifugal method and an average particle diameter of <=1/2 the minimum diameter of a nozzle hole capillary part.
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