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完全What are the limitations of hot runner ? The complete hot runner is a hot runner system with no gate waste and only injected products. Compared with the cold runner, the complete hot runner has a good effect in saving resin and reducing the injection cycle.
All kinds of problems in the use of complete hot runner system have also been paid attention to.

1. Aging failure of hot nozzle hot coil and aging failure of hot nozzle thermocouple sensor. The hot runner system that can provide runner free in function is often not satisfactory in stability. The main reason comes from the complex electric heating structure of the hot nozzle of the hot runner system and the high risk brought by the working environment with continuous high temperature of several hundred degrees Celsius all year round.

The hot runner system hot nozzle structure is complex, high failure rate, resulting in expensive molds and injection molding machines have too high down time, production efficiency and actual productivity are greatly affected, so engineers have been looking for a simple structure than the hot runner more stable system;

2. With the increase of the injection pressure of the nozzle of the straight gate, the residual internal stress around the gate also increases, and the probability of bad forming of the product is very high;

3. Complete hot runner structure is complex and expensive;

4. High price resin PEEK, LCP, PMMA, PPS, etc. are not suitable for complete hot runner.