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Related knowledge about injection molding (1 of 2)
Upadta time:2013/11/21 3:21:49
1. Temperature Control
a. Barrel Temperature: the temperature to be controlled during injection includes barrel temperature, nozzle temperature and mold temperature etc.The former two temperature mainly affect plasticization and flowability, the latter temperature mainly affect plastic flowability and cooling. Different plastics have different flow temperature, same plastic of different origin or brands will have different flow temperature and decomposition temperature, since average molecular weight and molecular weight distribution in different way, the plasticizing process in different injection machine is different, therefore the barrel temperature slection will be different.
b. Nozzle Temperature: nozzle temperature is usually slightly lower than barrel highest temperature, to avoid melted material forming jetting around straight through nozzle. While nozzle temperature can not be too low, otherwise early freezing of melted material will block nozzle, or early freezing melted material will affect product performance after flowing into mold cavity.
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