Injection mold hot runner technical knowledge points


        A hot runner gating system is understood to be […]

        A hot runner gating system is understood to be an extension of an injection molding machine. The function of the hot runner system is to adiabatically deliver the thermoplastic melt to the vicinity of the forming mold or directly to the mold.The hot runners can be heated independently and thermally insulated in the injection mold, which alone compensates for heat loss due to contact with the "cold" mold. Hot runner molds have been successfully used to process a variety of plastic materials, and plastic materials that can be processed with cold runner molds can be processed with hot runner molds.

        The smallest part is below 0.1 gram and the largest is above 30 kg. Hot runner molds are widely used in electronics, automotive, medical, daily necessities, toys, packaging, construction, office equipment and other fields.

A successful hot runner mold application project requires multiple links to be guaranteed.

The most important of these are two technical factors: one is the control of plastic temperature;

The second is the control of plastic flow.

A typical hot runner system consists of the following components: 1) hot runner plate (MANIFOLD); 2) nozzle (NOZZLE); 3) temperature controller; 4) auxiliary parts.

Advantages of hot runner molds:

1. shorten the molding cycle of the part;

2. saving plastic raw materials;

3. Reduce waste and improve product quality;

4. Eliminate the subsequent processes, which is conducive to production automation;

5. Expand the application range of the injection molding process.

        At the same time, there are also shortcomings such as rising mold cost, high requirements for manufacturing process equipment, and complicated operation and maintenance.In the more developed countries and regions, hot runner mold production is extremely active, the proportion of hot runner mold production continues to rise, and even some small mold factories with less than 10 people are producing hot runner molds. However, the research on hot runner technology in China has just begun. The scope of application is limited to large-scale enterprises, and the design capability is relatively blank. Therefore, the research on the application of this technology is of great significance.