1. Check the vent for early warning signs of rust or moisture -- if you find rust or moisture near the hot runner vent, it could mean internal condensation or the possibility of a broken pipe. Humidity can cause a fatal short circuit to the heater. If the machine is shut down at night or on weekends, rather than running year-round, the chances of this condensation happening increase.
2. Remind the operator not to "clean" the hot tip at the sprue -- if the operator happens to see a small piece of stainless steel at the sprue, it may be a sprue assembly. "Clean up" what seems to be a hindrance often ruins the hot tip. In order not to damage the hot nozzles, please confirm the type of nozzles in the hot runner system before taking action to ensure that all operators are trained and can identify all the different types of nozzles they are in contact with.
Sliding stop - this should be done once a week for machines that operate year-round.
4. Cross-check the resistance of the heater -- you should have measured it when you first started using the heater, and now it's time to measure and compare again. If the resistance fluctuates by 10% above or below, consider replacing the heater to ensure that it does not fail at critical points in the production process. If the initial resistance has never been measured, measure it now and use the value as a reference for future inspection of the heater.
5. Check the guide posts and guide bushing for signs of wear -- look for signs of scratches or scratches due to lack of lubrication. If marks are just beginning to appear, you can extend the life of the guide post and guide sleeve by lubricating them. If wear and tear have been severe, it is time to replace the parts. Otherwise, the cavity and core parts may not fit well, resulting in parts cavity wall thickness.
6. Check the flow of water -- connect a hose to the outlet of the waterway and let the water flow through the hose to the bucket. If the water is not clear or colored it may rust, and a poor flow means a blockage somewhere. If these problems are found, drill all the pipes through again to keep them clear (or clean them in any way you most commonly use). Improving the plant's water treatment system can prevent future problems caused by rust and blockage.
7. Clean the thimble -- over the course of a year, the thimble will become dirty due to gas accumulation and film impurities. It is recommended to give the mold cleaner a good cleaning every six to twelve months. After cleaning, apply a lubricant to the thimble to prevent abrasion or breakage.
8. Check the radius of the nozzle to see if there is a fracture -- the fracture is caused by the holding force from the plastic cartridge assembly during forward injection of loose hardened plastic fragments remaining in the hot mouth of the machine. It is also possible that the center line is misaligned.
Consider these two possibilities when discovering a fracture. If the damage is severe enough to prevent petal leakage (a term previously used by mold users for plastic leakage between the guide sleeve and the hot tip of the machine), the sprue sleeve should be replaced.
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