How to choose the flow channel system of injection mold?
Hot runner and cold runner systems in injection moulds are two different ways of conveying molten plastics. In the process of injection molding, the choice of the runner system is very important, which directly affects the molding quality, production efficiency and material utilization of the product. Today, let's talk about the advantages and disadvantages of cold runner and hot runner.
Cold runner The cold runner system allows the plastic to cool and cure in the runner. ✅Advantages： Low cost, simple operation wide applicability: suitable for all kinds of polymers and resins ❎ Disadvantages： Material waste The solidified flow path needs to be removed after each injection molding, resulting in waste of material. Long production cycle Due to the need for cooling runner, the production cycle is relatively long Product consistency problems Because the melt is cooled in the flow path, the quality and consistency of the product may be affected. Hot runner Hot runner systems use heating elements to keep the plastic molten in the runner. ✅ Advantages： Reduced material waste Because the plastic is always molten in the flow path, there is very little material waste Improve product quality The hot runner system can control the flow of plastics more precisely, thereby improving the dimensional precision and appearance quality of the product. The shortened production cycle hot runner system reduces cooling time because the plastic does not need to be cooled in the runner. Increased production efficiency The hot runner system enables faster injection molding and shorter cycle times. ❎ Disadvantages:： high cost, complex maintenance, and strict temperature control requirement
