Plastic Injection Molding Machines

Written by Jill Morrison
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Plastic injection molding machines are the most common tools for manufacturing plastic parts. These machines can be very expensive to use for creating parts. However, by using plastic as opposed to metal, companies can save on costs. Plastic is well-known as an economical and adaptable material to use for building parts. All sorts of items are created through injection molding, including your computer monitor, mouse, and keyboard.

Using Plastic Injection Molding Machines

When the injection molding process begins, plastic granules or pellets are initially melted into a liquid. This liquid is then injected into a specific mold. After the liquid has cooled and hardened, the part can be removed from the mold. Using angles in mold designs will help to facilitate the removal of the part from the mold. Also, using rounded corners will minimize stress to the part as it is removed.

Wall thickness is an important consideration for creating high quality plastic parts. By using thin walls, parts will cool faster, therefore reducing cycle time. Reduced cycle times and weights of parts from using thin walls will decrease overall costs. Some parts may require using different thicknesses for walls. However, there is a possibility that stresses will occur in this case because thinner sections will harden faster than thicker sections. It is wise to maintain consistent wall thickness for part designs whenever possible.

Molding textures and/or lettering onto part surfaces can be a valuable tool for creating parts. This process helps companies to identify different parts with labeling. Lettering is a good option for companies that need a large amount of small and similar parts. Texturing can be used to hide surface defects on parts, such as knit lines. Lettering and texturing can also be used as an aesthetic aid in business.


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