The hot runner technology was introduced into the plastics industry more than 50 years ago. It has revolutionized the processing capabilities of injection molding by improving the quality of molded parts, enhancing operational efficiency, reducing waste, and saving costs. The main advantages of hot runner technology:
- Provide high-quality parts for various applications.
- Prevent overfilling or under-filling of parts.
- No sink marks or flash formation on the mold components.
- Improve production efficiency.
- Reduce resin waste.
- Shorten the cycle time.
- Offer flexible design and provide customized solutions.
How does a hot runner injection molding system work?
Unlike the gate and runner system used in a cold runner system, the hot runner injects the plastic directly into the cavity. One of the greatest advantages of the hot runner system is that the plastic in the runner never solidifies. This reduces the cycle time and allows for faster processing. Another advantage of this system is the reduction of plastic waste, as the material does not harden until the mold is filled. Since there is no gate system, the amount of trimming work required to make the surface of the final product smooth is greatly reduced. The hot runner operates through an additional runner plate, which is fixed to the mold assembly.