Are concerned about the modeling of the hot runner technology - injection molding, hot runner, plastic - plastic industry

. Compared with the cold runner molds, hot runner mold has the following advantages: (1) shorten the molding cycle workpieces. In the absence of flow systems, plastic parts and mold cooling time can be shortened schedule to open mode, which can shorten the molding cycle. According to statistics, compared with the normal channel, hot runner mold the molding cycle can generally be reduced by 30% or so. (2) improve product quality, reduce scrap rates. In the hot runner molding process, plastic melt temperature in the flow system, accurate control, a more uniform state of plastic flow of the mold cavity, which can get high-quality parts, and with the pouring of hot runner molding of plastic parts export quality, low residual stress after ejection, part distortion. High-quality products on the market a lot of hot runner molds are used, such as cell phones, printers, notebook computers promise not produce waste in the high price of plastic raw materials for the applications, projects particularly significant. Many Plastic Parts And so on. (3) to save plastic material. Hot runner mold runner due to condensate does not produce material, so (4) Elimination of follow-up process is conducive to automation. Workpiece after forming by hot runner mold for the finished product, no pruning and recycling processing runner gate materials such as coagulation process is conducive to automation, significantly increasing productivity. (5) to expand injection molding applications. With the improvement and development of hot runner technology, currently used for molding hot runner mold not only a wide temperature range of melting plastic, such as Polyethylene , Polypropylene Etc., can also be used for molding a narrow temperature range, heat-sensitive plastic. But also in the flow technology developed on the basis of many advanced plastic molding process such as multi-color co-injection, multi-material co-injection process, stack molds. Although cold runner mold, compared with the number of hot runner mold unparalleled advantages, but we can not ignore the shortcomings of hot runner molds. To sum up, the general process of hot runner molds exist in the use of the following disadvantages: (1) complex. As the electric heater prone to overheating, easy to be caused by burning resin product obsolescence, and therefore must partition the multi-point hot runner heating and temperature control, which led to mold the structure complicated. (2) the high cost of mold. As a result of district heating, multi-point temperature, making temperature control device to increase the fees in order to increase the cost of mold. (3) repair complex. Factors such as poor temperature control can easily be burning heating device, an increase of maintenance projects. Moreover, each inspection will often have to remove mold from the injection plane to, after form removal maintenance, thereby increasing the production of auxiliary hours to lower productivity; (4) can not fundamentally solve the local overheating of hot runner systems problem. As the hot runner system to use more district heating, multi-point temperature, it needs more heating and temperature control devices, and these temperature control devices are present precision of their own problems, make hot runner system is not the actual temperature of the various regions of uniform . (5) The hot runner nozzle gate and close off the cavity, insulation measures can not be taken to avoid heat loss, so that a larger temperature difference between hot runner nozzles at both ends, it is difficult to maintain temperature balance, thereby adversely affecting injection molding .

Are concerned about the modeling of the hot runner technology - injection molding, hot runner, plastic - plastic industry

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