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Hot Runner

why causes mold with hot runner leakage?

Is the leakage on the outside of the plastic injection mold or internally. Possible causes for external leaks are worn probe seals or improper cleaning when being maintenance. Internal leakage may be caused by shooting through when manifold in not fully up to temp or wear on the crush rings reducing the preload on the system. There are several Hot Runner systems on the market and many causes for leakage. It would be helpful if you could be more specific with the type of system and location of leak. Also a great source for trouble shooting would be to contact the hot runner manufacturer since they are most familiar with their system(s) and the problems they may have.In general: I have seen hot runner internally flooded with plastic because injection molding parameters and settings are wrong. For example: mold cavity fill time too long, which causes the material to freeze up close to the injection points; then hold pressure applied onto frozen injection points— the molten plastic has to go somewhere, maybe into your hot runner. A good symptom for this problem is if you have material leakage at the mainmould entry valve gate and plastic creeping back up your screw cylinder - because the molten material cannot get into the frozen cavity. One specific situation: if your hot runner has transfer gates to inserts, and these inserts are not currently in use. The transfer gates might need time to warm up to the same temperature, so they stay shut. Or check if these unused transfer gates are really well shut.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

Do you know hot runner system?

    Hot runner system is an assembly of heated components used in plastic injection molds that inject molten plastic into the cavities of the mold. (The cavities are the part of the mold shaped like the parts to be produced.)By contrast, a cold runner is simply a channel formed between the two halves of the mold, for the purpose of carrying plastic from the injection molding machine nozzle to the cavities. Each time the mold opens to eject the newly formed plastic parts, the material in the runner is ejected as well, resulting in waste. A hot runner system usually includes a heated manifold and a number of heated nozzles. The main task of the manifold is to distribute the plastic entering the mold to the various nozzles which then meter it precisely to the injection points in the cavitiesHot runner advantagesShorter cycle time: No runner controlling the cooling timeEasier to start: Without runners to remove, and auto cycle occurs faster and more frequentlyFewer sink marks and under-filled parts: Unlike when plastic flows through a cold runner and loses heat to mold platesDesign flexibility: Can locate the gate at many points on the partBalanced melt flow: Separate melt channels are in externally heated manifolds that are insulated from mold plates surrounding them.    Hot runner systems were first developed and came into sporadic use in the early 60s with generally negative results. They gained popularity in the 80s and 90s as technological advancements allowed improved reliability and the escalation of plastic materials prices made hot runner systems more desirable and cost effective. Hot runners are fairly complicated systems, they have to maintain the plastic material within them heated uniformly, while the rest of the plastic injection mold is being cooled in order to solidify the product quickly. For this reason they are usually assembled from components pre manufactured by specialized companies.A hot runner controller is a temperature controller used to control the temperature in the hot runner. This helps create the most consistent part(s).Hot runners usually make the mold more expensive to manufacture and run, but allow savings by reducing plastic waste and by reducing the cycle time. (do not have to wait until the conventional runners freeze).Hello,i am Cherry,if you need any help,pls contact me via email:injectionmold2008@163.com  Whatsapp:+86 15112289056