How does Plastic Injection Molding Works

It is one of the most widely used and efficient processes in manufacturing all over the world; plastic injection molding is producing a large number of frequently used products every day. No wonder it is the most popular. However, despite its popularity, many of us are clueless about how plastic injection molding works or what are the processes involved in producing the products.

Plastic injection molding can produce large volumes of top quality products that are identical in a short amount of time. The products that it produces can range from high precision engineering parts to regular household objects.

This process accounts for a significant number of plastic products that are produced to today. This is because there are varied types, sizes strength and shapes of the thermoplastic materials that can be used in plastic injection molding it is the most favored manufacturing process of many manufacturers.

Development of the Mold

The first step in plastic injection molding is the creation of the mold from where liquid plastic will form into the required shape. Using the advances in Computer-aided design (CAD) technology, all prototyping is now done digitally. However, even with the advancement in prototyping, that success of plastic injection molding still depends on the skills of the industrial designer or the engineer and the mold or toolmaker in producing are perfect mold.

In creating a prototype mold, you can also use 3D printing especially if the product is simple. However, for more complicated designs, 3D printing will not be reliable because they will not last as compared to steel or aluminum. Typically, a 3D printed mold can last only after hundreds of cycles; the metallic mold can handle millions. The layered nature of the 3D printing process can also produce molds that are not in a smooth finish that metals can produce. In the end, the choice of the materials you want to use for the molds depends on the purpose and volume.

Once the mold is created and tested thoroughly, it is now ready to create the components.

There are the common thermoplastics that are used in injection molding: Acrylonitrile-Butadiene-Styrene (ABS), Nylon (PA), Polycarbonate (PC) and Polypropylene (PP).

The Plastic Injection Molding Process

The molding process is actually not difficult to understand. Once the mold is ready, the thermoplastic granules are fed into the heated barrel where they will melt into a liquid. This liquid is then guided through the nozzle of the injection molding machine into the cavity of the mold. This nozzle fills the mold with liquid plastic all the while taking its shape.

The molten plastic them cools very fast and becomes solid in a matter of seconds. The mold will open and ejects the newly formed product. This process will repeat until the quantity requirements are fulfilled.

It is worth taking note that different components have different cycle time depending on the mold structure, part size, resin and part structure.

If you need plastic injection molding services, Wintech can provide high quality and affordable plastic injection molding services. Contact them to see what they can do for you.

Published by Harris Scott


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