What is the function of the hot runner?
The hot runner is heated to ensure that the plastics in the runner and gate remain molten. Since there is a heating rod and a heating ring near or in the center of the runner, the entire runner from the nozzle exit of the injection molding machine to the gate is in a high temperature state, so that the plastic in the runner is kept molten. Generally, there is no need to open the runner to take out the condensate after shutting down. When the machine is turned on, it is only necessary to heat the runner to the required temperature. Therefore, the hot runner process is sometimes referred to as a thermal header system, or as runnerless molding.
Features of hot runner technology:
1. Save raw materials and reduce costs.
2. Shorten the molding cycle and improve the efficiency of the machine
3. Improve the surface quality and mechanical properties of products.
4. Point gates can be used without using three-plate molds.
5. A single product can be formed economically with a side gate.
6. Improve the degree of automation.
7. The needle valve gate can be used to control the gate for 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. Smaller injection pressure can be used, which can effectively reduce the post-deformation of thin-walled products.
