Periodic maintenance of die parts plays an important role in the service life of the die. The annual maintenance procedures required for each injection position depend on the cycle of the die. Following are some maintenance techniques for die parts, which can be used by each die user to ensure the effective operation of hot runner, heater, guide pillar, ejector, forming insert and other die components, in order to prevent accidents.

1. Check whether there is early warning rust or dampness in the loose stomata. If you find rust or dampness near the exhaust vent of the hot runner, it means internal condensation, or the pipe may burst. Moisture can cause fatal short circuit to the heater. If the machine is not running all year round and needs to be shut down at night or on weekends, the chances of such condensation will increase.

Remember to remind operators not to "clean" the hot nozzle at the gate. If the operator happens to see a small piece of stainless steel at the die nozzle, it may be a point nozzle assembly. Cleaning up what seems to be a hindrance often destroys hot mouths. In order not to destroy the hot nozzles, please confirm the type of nozzles in the hot runner system before taking action and ensure that all operators are well trained to recognize the different types of nozzles they come into contact with.

3. Sliding stop. This work should be done once a week for machines that run continuously throughout the year. And the end of the year is a good time to give these parts a routine lubrication maintenance.

4. Interactively verify the resistance of heater. You should have measured the resistance of the heater when you first started using it, and the end of the year is the time to measure and compare it again. If the resistance value fluctuates at (+10%), it is necessary to consider replacing the heater to ensure that it will not fail at the critical moment in the production process. If the initial resistance value has never been measured, it is measured once and used as reference data for future inspection of the heater.

5. Check whether there is any sign of wear between the guide pillar and the guide sleeve. Find out if there is Scratch or scratch marks, such as die parts wear due to lack of lubrication. If the trace is just emerging, you can also extend the life of the guide pillar and bush by adding lubricant. If the wear is serious, new parts should be replaced. Otherwise, the cavity and core parts may not fit well, resulting in different thickness of the cavity wall.

6. Check the flow of water. Connect a hose at the outlet of the waterway to allow water to pass through the hose and stay in the bucket. Rust may occur if the outflow water is not clear or colored, and a poor flow of water means blockage somewhere. If you find these problems, drill all the pipes again (or clean them up in any way you usually use) to ensure smooth flow. Improving the plant's water treatment system can prevent future problems caused by rust and congestion.

7. Clean thimble. After a year, the thimble becomes dirty due to gas accumulation and membrane impurities. It is recommended to clean the mould properly every 6 to 12 months. After cleaning, a layer of lubricant is applied to the thimble to prevent scratch or fracture.

8. Check whether there is a fracture in the radius area of the hot nozzle. The fracture is caused by the clamping force from the barrel assembly when the loose and hardened plastic fragments remaining in the hot nozzle of the machine are injected forward. The cause of the problem may also be that the center line is not aligned. These two possibilities should be taken into account in the discovery of fracture. If the damage is too serious to prevent petal leakage, the gate sleeve should be replaced in time.