What is an Injection Molded Plastic Part?
Most plastic components on the market today are injection molded. An injection molded plastic part is created using an injection molding machine, which works by melting plastic pellets, and injecting them into a mold. Designing plastic parts is a complex process, and the manufacturing end of it must be taken into account during the design phase. There are three elements of an injection molded plastic part, the nominal wall, projections, and holes and recesses. The nominal wall refers to the wall thickness. The wall thickness throughout the part should not vary by more than 10 percent. Varying wall thicknesses in the injection molded plastic part are one of the main causes of flawed product. In designing the part, one wishes to avoid excessively thick walls, simply because thick walls use more plastic, and are more expensive to produce. However, there is a limit as to how thin the part can be as well. The strength of the part is a function of the thickness, and the final use of the prod
