The repair procedures required for each injection molding location depend on the different mold cycle times. Here are some general guidelines that each mold user can use to ensure the effective operation of mold components such as hot runners, heaters, guide posts and thimbles, To prevent the appearance of accidents.
1. Check for any sign of rust or moisture in the air diffuser - if you see rust or moisture near the hot runner vents, it means condensation inside or there is a chance of the water tube rupturing. A fatal short to the heater - the chances of such a condensation increase if the machine does not run endlessly throughout the year, but at night or on weekends.
2. Remember to remind the operator not to 'clean up' the hot mouth at the gate - if the operator happens to see a small piece of stainless steel at the die gate then it may actually be a point nozzle. Often to ruin the hot mouth.In order not to damage the hot mouth, please confirm the hot runner system before the action of the mouth type, to ensure that all operators are well trained and can identify their contact with all different types of mouth.
3. Taxi stop - For a machine that operates endlessly throughout the year, this should be done once a week.
4. Reciprocally verify heater resistance - you should have measured the resistance of the heater just before you started it, and now it is time to measure again and compare it. If the resistance fluctuates 10% above and below Consider replacing the heater so that it does not go out of operation at a critical moment in the production process.If the initial resistance has never been measured then measure it now and use the resulting value as a reference for future inspection of the heater .
5. Check for signs of wear on the guide post and guide bush - look for scratches or scratches that wear out due to a lack of lubrication If the marks are just new, If lubrication is already severe, then it is time to change new parts, otherwise the cavity and core parts may not fit well, resulting in uneven thicknesses of the cavity walls.
6. Check water flow - connect a hose at the water outlet to allow water to pass through the water pipe to the tub, rust may occur if the water is not clear or colored, and unobstructed flow means somewhere it is clogged . If these problems are found, re-drill all pipes to ensure smooth flow (or take any of your most commonly used methods to clean up.) Improved factory water treatment system to prevent the future from rust and obstruction caused by a variety of problem.
7. Cleaning the thimble - After a year, the thimble will be dirty due to gas accumulation and membrane impurities.It is recommended to clean every 6 to 12 months with a mold cleaning agent.After cleaning, on the thimble Apply a layer of lubricant to prevent scratching or cracking.
8. See if there is a break in the radius area of the hot nozzle - the break is caused by the clamping force that the loose hardened plastic fragments that remain in the hot mouth of the machine caused by the injection molding cartridge assembly during forward injection. It is also possible that the center line is not aligned.
The two possibilities are to be considered when a fracture is found, if the damage suffered is severe enough to prevent the occurrence of petal-like leakage (a term formerly used by the user of the die: leakage of plastic between the bushing and the hot tip of the machine ), You should replace the sprue sleeve.