Advantages of a hot runner mold
Hot runner mold has been widely used in various industrial developed countries and regions in the world. This is mainly because the hot runner mold has the following significant characteristics:
1. Shorten the molding cycle of the parts because there is no limitation of the cooling time of the runner system, the parts can be ejects 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 and improve product quality In the hot runner mold molding process, the plastic melt temperature is accurately controlled in the runner system. 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 with hot runner mold
3. Eliminate subsequent processes, which is 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 the application of injection molding process Many advanced plastic molding processes are 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 second heat runner mold
Although hot runner molds have many significant advantages compared to cold runner molds, mold users also need to understand the disadvantages of hot runner molds. In summary, there are the following points.
1. Rising mold cost
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. High requirements for hot runner mold manufacturing process equipment
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. Complex operation and maintenance
Compared with the cold runner mold, the operation and maintenance of the hot runner mold are 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.