What is the role of the hot runner？

Heat the hot runner to ensure that the plastic in the runner and gate remains molten. Since there are heating rods and heating rings near or in the center of the runner, the entire runner from the nozzle outlet of the injection molding machine to the gate is at a high temperature, so the plastic in the runner is kept molten. Usually, the condensate can be taken out without opening the flow channel after shutdown. When starting the machine, just heat the runner to the required temperature. Therefore, the hot runner process is sometimes referred to as hot header system or runnerless molding.
Advantages and disadvantages of hot runner technology benefit
1. Save raw materials and reduce costs.
2. Shorten the molding cycle and improve machine efficiency
3. Improve the surface quality and mechanical properties of the product.
4. The point gate can be used without using a three-plate mold.
5. A single product can be economically molded through the side door.
6. Improve the degree of automation.
7. The gate can be controlled by a needle valve gate to prevent freezing.
8. The quality of the injection molded parts of the multi-cavity mold is consistent.
9. Improve the surface aesthetics of injection molded products.
10. A smaller injection pressure can be used, which can effectively reduce the post-deformation of thin-walled products.