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Articles:

What You Need to Know About Plastic Injection Molding

How Items Are Made Using Plastic Injection Molding

A Look At The Evolution Of Plastic Injection Molding Methods

How Plastic Injection Molding Methods Have Changed Throughout the Years

More Molding Methods

The Plastic Revolution

Understanding the Art of Machining Plastics

Molding Methods


Many of the plastic items which we use on a daily basis have all been created the same way.
Plastic injection molding methods have been used in order to create items that are used in many different fields including the medical field. Even household items such as toothbrushes and hair clips can be created using these methods.


Although materials may have changed slightly, the fact is that plastic injection molding methods are still the same at their most basic level. The process still calls for heated plastic to be injected into a mold and then chilled. Usually chilling occurs thanks to the passing of coolant over and around the molding chamber where the plastic is being shaped. The hardened plastic forms are then ejected and trimmed down so that they are ready for sale or use.

 

Brittle to Durable

Early plastic, invented in the 1850's was difficult to work with and tended to break easily. A later form of plastic which was developed soon after was easier to shape into different items. This was the first real step towards modern injection molding processes. As soon as a more versatile form of plastic was invented, the plastic injection molding methods similar to those we use today were also created.
There have been some changes to the plastic injection molding methods themselves but the larger changes have been to the plastics. Now, they are available in a much wider variety than they were in the late 1800's. It is now possible to color the plastic that is being molded since dyes and other chemical additives can now be mixed in with the plastic granules themselves. Specific additives can give plastics unique qualities that can make them more suitable for use in different industries and products.

 

Better Molds Change the Range of Possibilities

You may be interested to learn that the molds themselves have also changed. Early molds were made in two parts: the shaping cavity and the ejection portion that allowed the finished product to be ejected so that it can be trimmed and utilized. Now the complexity of the molds and the detail that they have has also altered although there are still two main portions: the mold and the ejector.


Although many items made with these methods had been created between the late 1800's and the 1940's, the war effort, and its need for many items which could be made using these methods caused changes in the process to be developed. The screw-type injector process was also developed at this time as well as methods that allowed different additives to be mixed in with the plastic that was to be molded. This was a huge advancement and one of the first real changes to the molding process itself.


Working and living in the modern world would not be possible if it was not for the products made using the injection molding process. They surround us and make our lives safer and much more convenient. From personal care products to containers that hold food and water, we live in a world that is influenced by plastic injection molding and the products that they produce.