Cold runner and hot runner are two commonly used runner forms in injection molding,and they play an indispensable role in the injection molding process.The following are some viewpoints and analyses on the development trends of cold and hot runners.

　　Cold and hot runners are channels for the flow of plastic materials during injection molding.Their main purpose is to ensure that plastic materials can flow smoothly into various cavities in the mold,and to make the molded parts high-quality,high-precision,and efficient.Different forms of runners have their own advantages and disadvantages in different injection molded products.With the development of technology and changes in market demand,both cold and hot runners have shown some new development trends.

　　Firstly,for the cold runner,it still has a wide range of applications in injection molding.Cold runner injection molding technology can avoid some problems caused by hot runners,such as heat buildup,shear heat,material waste,etc.For products with high requirements for the appearance of injection molded products and complex processes,cold runner is still an ideal choice.With the continuous progress of mold manufacturing technology,cold runner technology is also constantly improving,such as the use of new cooling systems such as cooling pipes and cooling plates to improve cooling effectiveness and accelerate injection molding cycles.

　　Secondly,hot runner injection molding technology has also been widely applied and developed in recent years.Compared to the cold runner,the hot runner can achieve better plastic material flow control,reduce pressure loss during the injection molding process,and improve the appearance quality and dimensional accuracy of the product.With the increasing demand for appearance quality and product dimensional accuracy in the plastic product market,hot runner injection molding technology will be widely used.The hot runner system is also constantly developing,such as using advanced heating control systems,hot runner valve technology,etc.,to improve the stability and control accuracy of the hot runner.

　　In addition,with the development of intelligent manufacturing and Industry 4.0,cold and hot runner injection molding technology will also move towards intelligence.The intelligent cold and hot runner systems can achieve real-time monitoring and control of parameters such as temperature and pressure,improving production stability and consistency.Through data collection and analysis,the injection molding process can be optimized to reduce defect rates and energy consumption.At the same time,the intelligent flow channel system can also achieve remote monitoring and debugging,improving production flexibility and efficiency.

　　Finally,environmental protection and sustainable development will also have an impact on the development of cold and hot runner injection molding technology.With the enhancement of environmental awareness,the injection molding industry has increasingly high requirements for material conservation and recycling.During the injection molding process,there is a certain problem of material waste in both the cold and hot runners,so more effective material utilization and recycling technologies are needed to reduce unnecessary resource waste.