What are the advantages and disadvantages of hot runner molds in injection molding?

Hot runner mold is a more commonly used mold making method. Any material can be processed by hot runner, such as PP, PE, PS, ABS, PBT, PA, PSU, PC, POM, LCP, PVC, PET, PMMA, PEI, ABS/PC, etc. Any plastic material that can be processed with cold runner molds can be processed with hot runner molds.

1. Shorten the molding cycle of parts
Because there is no restriction on the cooling time of the runner system, the parts can be ejected in time after they are solidified. Many thin-walled parts produced with hot runner molds can have a molding cycle of less than 5 seconds.

2. Hot runner mold can save plastic raw materials
Since there is no cold runner in the pure hot runner mold, there is no production cost. This is especially significant for applications where plastics are expensive. In fact, the major hot runner manufacturers in the world have all developed rapidly in the era when petroleum and plastic raw materials were expensive in the world. Because hot runner technology is an effective way to reduce material costs.

3. Reduce waste and improve product quality
During the molding process of the hot runner mold, the temperature of the plastic melt is accurately controlled in the runner system. Plastic can flow into each cavity in a more uniform state, resulting in parts with consistent quality. The gate quality of the parts formed by the hot runner is good, the residual stress after demolding is low, and the deformation of the parts is small. Therefore, many high-quality products on the market are produced by hot runner molds.

4. Eliminate subsequent processes, which is conducive to production automation. After the parts are formed by the hot runner mold, they are finished products, and there is no need to trim the gate and recover the cold runner and other processes.

5. The use of hot runner molds for objects that are more difficult to form is conducive to the forming of plastic parts.
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