Advantages of a hot runner mold

Hot runner mold has been widely used in various industrial developed countries and regions in the world today. This is mainly because the hot runner mold has the following significant characteristics:

1, shorten the forming cycle of the parts because there is no limitation of the cooling time of the runner system, the parts can be ejecting in time after forming and curing. Many thin-wall parts produced with hot runner molds can be formed in less than 5 seconds in a pure hot runner mold because there is no cold runner, so there is no production cost. This is particularly significant for applications where plastic is expensive. In fact, the major international hot runner manufacturers have developed rapidly in the era of expensive oil and plastic raw materials in the world. Because hot runner technology is an effective way to reduce the cost of materials.

2, reduce waste products, improve product quality In the hot runner mold molding process, the plastic melt temperature in the runner system is accurately controlled. The plastic can flow into each mold cavity in a more uniform state, resulting in a consistent quality part. The hot runner forming parts gate quality is good, the residual stress after demoulding is low, the parts deformation is small. Therefore, many high-quality products on the market are produced by hot runner molds. Such as the familiar MOTOROLA mobile phone, HP printer, DELL laptop many plastic parts are made of hot runner mold

3, the elimination of subsequent processes, conducive to production automation. The product is finished after the hot runner mold is formed, and there is no need to trim the gate and recycle the cold runner. Conducive to production automation. Many foreign product manufacturers combine hot runner with automation to greatly improve production efficiency.

4, Expand injection molding process application, many advanced plastic molding process is developed on the basis of hot runner technology. Such as PET preforming production, multi-color co-injection in the mold, multi-material co-injection process, STACKMOLD and so on.

Disadvantages of the two-heat runner mold

Although the hot runner mold has many significant advantages compared to the cold runner mold, the mold user also needs to understand the disadvantages of the hot runner mold. In summary, there are the following points.

1, mold cost rise

The price of hot runner components is relatively expensive, and the cost of hot runner mold may be greatly increased. If the parts production is small, the mold tool cost ratio is high, and the economy does not spend. For mold users in many developing countries, the high price of hot runner system is one of the main problems affecting the wide use of hot runner mold.

2, hot runner mold manufacturing process equipment requirements

The hot runner mold needs precision machining machinery to ensure. The integration and cooperation requirements of the hot runner system and the mold are extremely strict, otherwise there will be many serious problems in the production process of the mold. If the plastic seal is not good, the hot runner element is damaged by the plastic overflow, and the relative position of the nozzle insert and the gate is not good, the quality of the product is seriously decreased.

3, operation and maintenance complex

Compared with the cold runner mold, the operation and maintenance of the hot runner mold is complicated. If the use of improper operation is easy to damage the hot runner parts, so that production can not be carried out, resulting in huge economic losses. For new users of hot runner molds, it takes a long time to accumulate experience.