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Approximately 30% of all plastic products in the world are produced by an injection molding process. Within this another 30% are produced using a custom injection molding technology. There are basically six steps involved in the normal injection molding process. The first step is the clamping of the mould, the clamping unit makes for one of the three units of the molding machine. The other two being the injection unit and the mold, once the clamping unit holds on to the mold, the molten plastic is injected into the mold by the injection unit. The plastic is fed in the form of tiny pellets onto a hopper. These are then allowed into a cylinder where they are heated into a molten state and injected into the mold. The steps that follow are referred to as dwelling phase. It basically involves making sure all the cavities in the mold are fully filled. The mold is then allowed to cool with the clamping intact. Finally the mold is opened and the component is ejected out. The biggest advantage of plastic injection molding is the cost factor of the produced parts, especially when you need large number of parts. The disadvantage is the cost of manufacturing the molds; a simple injection mold can cost you $3000 while the bigger complex ones can run into several hundreds of thousands.
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