Plastic nets tell the advantages and disadvantages of hot runner molds

Advantages of hot runner molds:

Shorten the cycle

The molding cycle of the part is shortened. Because there is no limitation of the cooling time of the sprue system, the parts can be ejected in time after solidification. Many thin-walled parts produced with hot runner molds have a molding cycle of less than 5 seconds.

2. Save plastic

In the pure hot runner mold, there is no cold runner, so 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 experienced rapid development in the world when oil and plastic raw materials are expensive. Because hot runner technology is an effective way to reduce material costs and reduce material costs.

3. Reduce waste

Reduce waste and improve product quality. During the hot runner mold forming process, the plastic melt temperature is accurately controlled in the runner system. Plastics can flow into the cavities in a more uniform state, resulting in consistent quality parts. The hot runner forming parts have good gate quality, low residual stress after demolding, and small part deformation. Therefore, many high quality products on the market are produced by hot runner molds. Many familiar plastic parts such as MOTOROLA phones, HP printers, and DELL laptops are made with hot runner molds.

4. Production automation

Eliminating subsequent processes is conducive to production automation. After the workpiece is formed by the hot runner mold, it is the finished product, and there is no need to trim the gate and recycle the processed cold runner. Conducive to production automation. Many foreign manufacturers have combined hot runners with automation to significantly increase production efficiency. Many advanced plastic molding processes have been developed based on hot runner technology. Such as PET preforming, multi-color co-injection in the mold, a variety of materials co-injection process.

Disadvantages of hot runner molds:

Although hot runner molds have many significant advantages over cold runner molds, mold users also need to understand the shortcomings of hot runner molds, with the following main points.

1. Cost rise

Hot runner components are more expensive, and hot runner mold costs can increase significantly. If the production of parts is small, the cost of mold tools is high and economically uneconomical. For mold users in many developing countries, the high cost of hot runner systems is one of the main problems affecting the widespread use of hot runner molds.

2. High equipment requirements

The production process equipment is required to be high, and the hot runner mold requires precision processing machinery as a guarantee. The integration and cooperation requirements of the hot runner system and the mold are extremely strict, otherwise the mold will have many serious problems in the production process. If the plastic seal is not good, the plastic overflows and damages the hot runner components, and the relative position of the nozzle insert and the gate is not good, resulting in serious deterioration of the product quality.

3. Operation and maintenance is complicated

The hot runner mold operation and maintenance is complicated compared with the cold runner mold. If the operation is improper, it will easily damage the hot runner parts, making production impossible, resulting in huge economic losses. For new users of hot runner molds, it takes a long time to accumulate experience.