injection molding explanation diagram

The term, “injection molding”, is often thrown out in reference to packaging and storing DVDs, but many people do not understand the concept of injection molding.

The following information is a brief explanation of what injection molding is and how injection molded products like lawn furniture, thermal coffee cups and even DVD cases are made?

Injection molding is a manufacturing process used to produce parts from thermoplastic pellets and is similar to making candles from a mold.

Some of the common types of thermoplastic are: polystyrene, acrylonitrile butadiene styrene (ABS), polyamide, polypropylene, polyethylene, and polyvinyl chloride (PVC). These different thermoplastics vary in durability, resistance, and flexibility

First, a mold is custom designed from metal and detailed to form the desired finished product. Molten plastic is then injected at high pressure into this mold that is the inverse of the product’s shape. Hydraulic or mechanical pressure is applied to make sure all the cavities within the mold are filled. The plastics are allowed to cool and then removed with ejecting pins. There may be excess material, which is then trimmed off and recycled.

So the next time you consider purchasing a plastic product, you will have a much better idea of just what it takes to make it!

Watch this video if you are also interested in how thermoforming works:

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