What is a Sprue bush?

A sprue bush is a cylindrical part that is attached to a mold. "Sprue" is a word that means the route (runner) that carries the melted resin (plastic) injected from the nozzle of the molding machine to the mold. A sprue bushing is used to form this sprue. This part consists of a sprue hole fitted with something called a taper and a base suitable for closely fitting injection molding machine nozzles. It is one of the very important parts when molding resin with a mold.

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