Before operating a vertical injection molding machine, ensure that the steps you are following are correct. Carefully read the operational manual and understand the standard shutdown procedures required for the plastic being used.
If the temperature of the cylinder or barrel is high, it is advisable to shut down the machine overnight to prevent the resin from decomposing due to heat. For instance, turn off the heater of the injection cylinder (specifically the heater for the injection nozzle), and attempt to cool the cylinder while continuing to extrude any remaining resin. Close the slide at the bottom of the hopper and try to spray any residual material in the barrel. If no plastic is extruded, you can turn off the machine and prepare it for the next use.
If the plastic decomposes or burns within the injection molding machine, it will eventually change color, resulting in defective products. In such cases, the injection molding machine must be completely turned off and cleaned. A preventive measure is to use heat-sensitive resins that possess high thermal stability, which can withstand subsequent heating.
After the vertical injection molding machine has been suspended, do not use it to clean out the remaining plastic from the injection cylinder and barrel. If the plastic fades, the frequency of cleaning will increase. Additionally, when performing minor repairs, the heater of the injection cylinder should be set to a low temperature, such as 150°C, to minimize the risk of thermal decomposition.
