So, why did hot runner technology emerge? What benefits can it bring us? Friends familiar with injection molding processes know that conventional injection molding often has the following adverse factors:
1、Difficult mold filling;
2、Deformation of large thin-walled parts;
3、Waste of raw materials in runners;
4、Inconsistent quality of injection-molded parts in multi-cavity molds. 
The emergence of hot runner technology has provided relatively complete solutions to these problems. Generally speaking, the use of hot runners has the following advantages:
1.Save raw materials and reduce costs. 
2.Shorten molding cycle and improve machine efficiency 
3.Improve surface quality and mechanical properties of products. 
4.Pin point gates can be used without three-plate molds. 
5.Single products can be economically molded with side gates. 
6.Improve automation level. 
7.Valve gate freezing can be controlled with valve pin gates. 
8.Consistent quality of injection-molded parts in multi-cavity molds. 
9.Improve surface aesthetics of injection-molded products. 
However, every technology has its own disadvantages, and hot runner technology is no exception: 
1. Complex mold structure, high cost, and high maintenance expenses. 
2. It takes time for the process to stabilize after startup, resulting in more startup waste products. 
3. Melt leakage or heating element failure has a significant impact on product quality and production schedule.
Special attention should be paid to the third disadvantage mentioned above. It can be reduced by purchasing high-quality heating elements, hot runner plates and nozzles, and maintaining them carefully during use.