ABSTRACT
Injection molding and injection blow molding machines are very similar. The plasticating unit of both machines is very similar. Usually, both units use reciproscrew injection units and are run by hydraulics. The hydraulic oil should be changed any time the oil shows signs of a dark color (deep amber), which indicates oxidation. This is usually caused by overheating and burning of the oil. If the machine indicates hot oil or shuts off because of hot oil, the oil should be checked for oxidation. Change the oil immediately if it should become the color of coffee with cream, which indicates that water is in the oil. The heat exchanger should be checked for leakage or malfunction. Some plants use chilled water in the heat exchanger, which is fine if the chiller is above 42°F. Tower water is predominantly used; however, in areas in which daytime temperatures are over 95°F for an extended period of time, tower water may be too warm to remove heat through the heat exchanger, and the oil will overheat. The following images are of a maintenance checklist guide. If you have questions, consult the machine supplier and check the maintenance manual that was provided with your machine.
