Plastic Injection Moulds

The mold comprises two main parts: the injection mold (A plate) and the ejector mold (B plate), which are also known as moulder and mouldmaker. Plastic resin is introduced into the mold via a sprue or gate in the injection mold. The sprue bushing seals tightly against the nozzle of the injection barrel of the molding machine, allowing molten plastic to flow from the barrel into the mold, known as the cavity. The sprue bushing guides the molten plastic into the cavity impressions through channels on the A and B plates. These channels, called runners, enable the plastic to flow along them. The molten plastic moves through the runner and enters specialized gates, ultimately filling the cavity geometry to create the desired part.