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Plastic containers are produced using several different forming methods, including thermoforming, injection molding, and blow molding. To a large degree, the forming method used is dictated by the shape of the container.

IML is used in both injection molding and blow molding forming methods. In injection molding, molten plastic material is injected, under pressure, into a cavity (mold) that forms the shape of the container. For IML, a label is properly positioned in the cavity prior to the injection of the plastic. After the material is injected into the mold, it is allowed to cool, with the label becoming an integral part of the container.