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119. What is plastic injection molding?

Plastic injection molding becomes more and more popular. So many people know it. However there are some people don't know what is plastic injection molding. So we introduce some things to you.

All of this material started out generally as plastic pellets. The pellets are feed into one of the massive plastic molding machines which often weigh around 25 tons. The machine heats the plastic until it is liquid. This liquid is then forced through injectors into molds.

These custom molds can be made to almost any shape or size. To put it simply, injection molding is the process of forcing melted plastic in to a mold cavity. Once the plastic has cooled, the part can be ejected. It is useful when the parts are too complex or cost prohibitive to machine. With this process, many parts can be made at the same time, out of the same mold.

The products that use injection molding are used every day by all of us. Many cars would not be so affordable if it was not for injection molding, however there are some disadvantages to the process. The machinery is very expensive and involves a high capital investment, design of parts must bear in mind the production process, and the process is not economically for short runs of products.

However the disadvantage are out-weighed by the greater advantages, the speed at which parts can be made, low labor costs, minimal material waste, and finished parts often need no more finishing.