Cold runner and hot runner are two commonly used runner systems in plastic injection molds,which play an important role in the production process of plastic products.The following will provide a detailed introduction to the definitions,differences,and relationships between cold and hot runners.

　　Cold runner is a relatively traditional injection mold runner system composed of metal materials,mainly used for simpler structures and shapes in plastic products,such as flower pots,product packaging,etc.The advantages of a cold runner are low cost,simple structure,and easy manufacturing and maintenance.Meanwhile,due to the fact that the cold runner does not require heating,material degradation and thermal deformation will not occur during the injection molding process,ensuring stable quality of the plastic parts.However,due to the lack of a heating system in the cold runner,the cooling time is longer and the production cycle is longer,resulting in relatively low production efficiency for injection molding of multiple rough embryos.

　　Hot runner is a relatively advanced injection mold runner system that heats the runner through a heating system,keeping the plastic in a high temperature state throughout the runner,thereby achieving uniform filling and rapid cooling of the plastic.Hot runner is suitable for complex plastic products,such as automotive parts,electronic product casings,etc.Its advantages lie in saving plastic materials,shortening production cycles,and improving production efficiency.At the same time,the hot runner can also achieve control of multiple injection points,allowing complex plastic products to be injection molded in one go,reducing subsequent processing and assembly processes.However,the manufacturing and maintenance of hot runners are relatively complex,with high costs and high requirements for mold manufacturers and operators.

　　There is a close relationship between the cold runner and the hot runner.Firstly,they are all flow channel systems in plastic injection molds,where plastic is melted and injected into the mold cavity through the flow channel,ultimately obtaining the required plastic products.Secondly,both cold and hot runners need to consider factors such as plastic flowability,filling ability,and cooling time to ensure the quality and efficiency of the injection molding process.Finally,according to different products and production needs,you can choose to use cold or hot runners,or configure both in the same mold to achieve better injection molding results.

　　In summary,cold and hot runner systems are commonly used in plastic injection molds.They all have their own advantages and applicability in the production process of plastic products.Choosing a suitable flow channel system can improve production efficiency,reduce costs,and ensure stable product quality.