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About Hot Runner Mold

Publisher: Administrator Date: 2023-11-02

About Hot Runner Mold

-Development History

The production of hot runner molds is extremely active in industrialized countries and regions around the world. The proportion of hot runner molds is constantly increasing. Many small mold factories with less than 10 people produce hot runner molds. Overall, North America and Europe have been using hot runner technology for a long time and have a higher level of experience. In Asia, except Japan, Singapore, South Korea, Taiwan, China and Hong Kong are in the lead. Although the level of mold manufacturing is relatively high in North America and Europe, the prices are higher and the delivery time is longer. In contrast, Asian hot runner mold manufacturers are more competitive in terms of price and delivery time. The hot runner mold in Chinese Mainland is still in its infancy, but it is growing rapidly and the proportion is increasing.

-Structure

The hot runner system generally consists of several parts, including a hot nozzle, a splitter plate, a temperature control box, and accessories. There are generally two types of thermal nozzles: open type and needle valve type. Due to the fact that the form of the hot nozzle directly determines the selection of the hot runner system and the manufacturing of the mold, the hot runner system is often divided into an open hot runner system and a needle valve hot runner system accordingly. The splitter plate is used when the first mock examination has multiple cavities or multi-point feeding, single point feeding, but the material level is offset. The material is usually P20 or H13. The splitter plate is generally divided into two categories: standard and non-standard, and its structural form is mainly determined by the distribution of the cavity on the mold, nozzle arrangement, and gate position. The temperature control box includes the host, cables, connectors, and wiring male and female sockets. Hot runner accessories typically include heaters and thermocouples, runner sealing rings, connectors, and junction boxes.

advantage

Shorten the cycle

The molding cycle of the workpiece is shortened, and due to the lack of cooling time limitations in the runner system, the workpiece can be ejected in a timely manner after solidification. Many thin-walled parts produced using hot runner molds can have a forming cycle of less than 5 seconds.

Saving plastic

In pure hot runner molds, there is no production cost due to the absence of a cold runner. This is particularly significant for expensive plastic application projects. In fact, the major international hot runner manufacturers have achieved rapid development in the era of high prices for petroleum and plastic raw materials in the world. Because hot runner technology is an effective way to reduce material costs and reduce material costs.

Reduce waste

Reduce waste and improve product quality. During the hot runner mold forming process, the temperature of the plastic melt is accurately controlled in the runner system. Plastic can flow into each mold cavity in a more uniform and consistent state, resulting in parts of consistent quality. The parts formed by hot runner have good gate quality, low residual stress after demolding, and small deformation of the parts. So many high-quality products in the market are produced by hot runner molds. Many plastic parts in familiar MOTOROLA phones, HP printers, and DELL laptops are made using hot runner molds.

Production automation

Eliminating subsequent processes is beneficial for production automation. The finished product is formed by a hot runner mold, without the need for trimming gates or recycling cold runners. Beneficial for production automation. Many foreign product manufacturers combine hot runner with automation to significantly improve production efficiency. Many advanced plastic forming processes have been developed based on hot runner technology. For example, PET pre molding production, multi color co injection in molds, multi material co injection process, STACK MOLD, etc.

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