What is plastic injection molding?

Molding is a big topic. There is blow molding, which as its name implies, blows molten plastic into a mold and can be used to make everything from spray bottles to children’s toy chests. Rotational molding is often used for larger items like garbage cans and hot tub shells. You can think of the molding machine as an industrial Tilt-A-Whirl, one that tumbles a heated mold in all directions, allowing the polymer charge within to spread evenly across its surface. Compressional molding squeezes heated plastic between two halves of a mold, similar to how a waffle maker works.