![]() In an injection molding machine, molten plastic material is forced out of a nozzle via reciprocating screw within a barrel. Gates are very small connecting points between a runner and a mold cavity Runners are channels that feed material from the sprue to a gate In short:Ī sprue is an inlet that feeds material from the injection machine nozzle to the inside of the mold This article goes over the basics of injection mold sprues, runners, and gates, explaining how they work and listing the different types available. Firstly, they allow for a controlled and even distribution of plastic - helping to minimize air bubbles, for example - and they also make it possible to include several parts within a single mold, with different runners and gates feeding different cavities. There are several reasons why molds incorporate a sprue, runners, and gates. Instead, the plastic goes from the nozzle of the injection molding machine through something called a sprue, then a system of runners, then a gate before it enters the mold cavity. But the transfer of the plastic isn’t direct - it’s not like filling up a water balloon at a faucet. In simple terms, parts are made by forcing molten plastic from an injection molding machine into a mold. Fast, repeatable, and incredibly scalable, the process is used in everything from toys to automotive components. Plastic injection molding is the most common manufacturing technique for plastic parts.
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