Author: Site Editor Publish Time: 2021-10-19 Origin: Site
Hot runner mold for injection molding machine
Hot runner mold refers to a mold that uses a heating device to make the melt in the runner never solidify. Because it has a shorter forming cycle than traditional molds and saves raw materials, hot runner molds are widely used in developed countries and regions in the world today.
The hot runner system is generally composed of hot nozzles, manifolds, temperature control boxes and accessories. Thermal nozzles generally include two types: open thermal nozzles and needle valve thermal nozzles. Since the form of the hot nozzle directly determines the selection of the hot runner system and the manufacture 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 one mold has multi-cavity 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. Its structure is mainly determined by the distribution of the cavity on the mold, the arrangement of the nozzles and the position of the gate. The temperature control box includes the host, cables, connectors and wiring male and female sockets, etc. Hot runner accessories usually include: heaters and thermocouples, runner seals, connectors, and junction boxes.
Shorten the cycle
The molding cycle of the parts is shortened. Because there is no limitation of the cooling time of the runner system, the parts can be ejected in time after they are molded and solidified. Many thin-walled parts produced with hot runner molds can have a molding cycle of less than 5 seconds.
Since there is no cold runner in the pure hot runner mold, 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 all developed rapidly in the era when petroleum and plastic raw materials were expensive in the world. Because hot runner technology is an effective way to reduce material costs.
Reduce waste and improve product quality. During the molding process of the hot runner mold, the temperature of the plastic melt is accurately controlled in the runner system. Plastic can flow into each cavity in a more uniform state, resulting in parts with consistent quality. The gate quality of the parts formed by the hot runner is good, the residual stress after demolding is low, and the deformation of the parts is small. Therefore, many high-quality products on the market are produced by hot runner molds.
Elimination of follow-up procedures is conducive to production automation. After the parts are formed by the hot runner mold, they are finished products, and there is no need to trim the gate and recover the cold runner and other processes. Conducive to production automation.