Patent 10220150 was granted and assigned to Mitsubishi Gas Chemical Company on March, 2019 by the United States Patent and Trademark Office.
The present invention provides a manufacturing method of a syringe barrel capable of securing smoothness of a nozzle tip and productivity. A manufacturing method of a syringe barrel that is injection-molded from a nozzle tip comprises cutting a remaining gate at a nozzle part using an ultrasonic cutting apparatus having a mechanism for suppressing abnormal vibrations.