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Hot runner system

Posted by admin on July 7th, 2015

Introduction: Runner by heating approach to ensure the flow channel and gate remains molten plastic. Hot runner system generally consists of several parts hot nozzle, manifold, temperature control boxes and accessories and other components.


1. Molding Cycle. Because there is no limit runner system cooling time after molding parts can be promptly cured ejection. Many hot runner mold thin-wall parts molding cycle in five seconds or less.

2. Saving plastic materials. In pure hot runner mold because there is no cold runner, so no production waste. This is particularly important for the application of plastic expensive project significance. In fact, a major international hot runner manufacturers are in the world, oil and plastic raw materials expensive era has been rapid development. Because hot runner technology is expected to reduce the cost effective way to reduce the cost of materials.

3. Higher product quality. In hot runner molding process, the plastic melt temperature be accurately controlled in the runner system. Plastic can be more uniform flows into each cavity, the result is consistent quality parts. Part gate hot runner molding of good quality, low residual stress after ejection, part distortion. So many on the market of high-quality products are hot runner mold. As people familiar with the MOTOROLA phones, HP printer,, DELL notebook computer’s many plastic parts are produced with a hot runner mold.

4. Production automation. After hot runner molding parts for the finished product, and the recovery process without pruning gate cold runner and other processes. It is conducive to automation. Many foreign product manufacturers have the hot runner and automation combined to greatly increase productivity.

5. Larger range of applications. Many advanced plastic molding process is developed on the basis of hot runner technology. Such as the production of PET preforms in a mold multi-color co-injection, multi-material co-injection process, STACK MOLD like.


1. Higher Tooling costs. More expensive hot runner components, hot runner mold costs can be significantly increased. If the production of small parts, molds tooling costs high proportion of economically worthwhile. Users of the mold in many developing countries, the price of your hot runner system is one of the major issues affecting the hot runner molds are widely used.

2. Higher Equipment requirements. Hot runner mold needs to guarantee precision machine. Integration with hot runner systems and molds with very strict requirements, otherwise there will be a lot of serious mold problems in the production process. Plastic sealed well as cause damage to the hot runner components plastic overflow interrupt production, inserts the nozzle and the gate leading to a serious decline in the relative position of poor product quality.

3. Harder to operate and maintain. Compared with the cold runner mold, hot runner mold operation and maintenance complex. Such as the use of hot runner components are easily damaged by improper operation, so that production can not be, causing huge economic losses. For new users of hot runner molds, it takes a long time to accumulate experience.

Posted by Hillary Wang,

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