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How to simplify the hot runner system connection and avoid assembly errors?
Aug 16, 2017

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Today, insert molding technology, coin injection molding technology and multi-component injection molding technology are inseparable from the hot runner support. A large number of components such as car bumper and so on because of the flow path limit, the ratio of wall thickness and fusion seam problems can only use hot runner mold for processing molding. In the injection molding, the hot runner system plays a more and more important role.


Although the hot runner and injection mold is a whole, but its role and function compared with the mold itself is completely different. For the independent unit of the system, its installation, connection and operation have special high-precision location requirements. For these reasons, the assembly of the hot runner system becomes a bottleneck for the mold installation. Therefore, to avoid the hot runner system installation process errors and simplify the system connection and save assembly time has become a very important issue.


1. Conventional hot runner design


The hot runner system is derived from a hot runner system. Typically, the nozzles are not always installed on the manifold, but also on the nozzle flanges, but such systems require a fixed plate to maintain system integration. For most plastic processing processes, there is a temperature difference between the hot runner and the mold due to the temperature of the mold close to 200 ° C. If the system is connected to the mold plate, it will raise the temperature and increase the heat loss, and between the manifold and the nozzle may also produce a moving dead angle.


When the hot runner requires maintenance, the hot runner must be completely removed from the mold. Since the nozzles are not connected to the manifold, the electrical and hydraulic lines must be completely disassembled and connected after the end of the service.


2. Combined hot runner system


In the combined hot runner system, the nozzle and manifold form a simple unit. The melt flows directly from the manifold to the nozzle, so that no deviation or flow dead angle occurs. Through the threaded nozzle is embedded in the manifold, eliminating the nozzle and the splitter between the leakage phenomenon. Conventional bushing systems are designed to produce thermal expansion, which is particularly effective in eliminating such leaks.


The combined hot runner system is located at the center of the mold and has little connection to the mold, and its manufacturing material is not required to have a high thermal conductivity, nor is it required to set the clamping and pre-tension the die. This minimum connection provides a high-precision and stable temperature curve, so the energy consumption is much lower than the traditional hot runner system.


The combined hot runner system can be preassembled directly with a hydraulic circuit independent of the mold. Hydraulic equipment Direct drive of the valve can also be installed directly on the system, thus omitting the traditional machine control valve, so that more flexible injection molding. In addition, electrical and hydraulic lines can also be configured according to customer requirements. Since the system will undergo electrical, temperature, hydraulic or air pressure testing before delivery, the customer will be provided with a description of the preinstalled system so that it can be easily installed in the mold and put into production immediately.


When the mold or system requires routine maintenance, the combined hot runner system can also be removed from the mold using a simple step, which can be repaired and tested independently of the mold.


In general, the combined hot runner system reduces maintenance costs. The complete hot runner system is based on a modular pre-configured design and installation, where the wires of the heater or thermocouple are removed during assembly. The wires connecting the heaters and the distribution box are housed in a specially designed conduit which is advantageous for the removal of the mold or hot runner system. At the same time, the integrated hot runner system is capable of day-to-day maintenance without disassembly, saving time and reducing the chance of assembly errors.

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