What is the injected plastic part?

Most plastic components on today's market are now formed by injection. The injected plastic part is created using an injection molding machine that works by melting the plastic pellets and injectioning them into a mold. There are three elements of injected plastic parts, nominal wall, projection and holes and niches.

The nominal wall concerns the wall thickness. The wall thickness throughout the part should not differ by more than 10 percent. Variable wall thicknesses in the injection plastic part are one of the main causes of the wrong product. When designing part, one wants to avoid too strong walls, simply because thick walls use more plastic and are more expensive to produce. However, there is a limit of how thin it can be. The force of part is a function of the thickness and the final use of the product will determine the required force. Some specialized injectable plastic parts require reinforcement with glass or carbon fibers. The ribs must not be stronger than the nominal wall, otherwise they may result in washbasin sinks.

niches and holes are also the main structural element, the location of any holes or niches can significantly affect the overall strength of the part. The attempt to create a hole on the part of the part is particularly demanding and the need for side openings should be minimized in the initial design.

Another design factor is the corners of the part. The way plastic enters and fills mold is very worrying. Because the molten plastic is a liquid, the dynamics of fluids will also largely dictate. When flowing into the mold, the plastic has to go around the corners. The plastics will flow better if the corners are rounded. Plastics during the cooling process pull to the sharp corner and can occur. Creating a low voltage with smooth transitions will lead to a stronger part that is less likely to burst or break.