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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

A Look At The Evolution Of Plastic Injection Molding Methods

You may be surprised to learn that many of the items we use on a daily basis have all been made using the same techniques. The different plastic injection molding methods allow us to create many objects ranging from simple items such as toothbrushes and hair clips to complicated items uses in fields such as medicine. It is interesting to learn about plastic injection molding methods and the ways that they have changed over the years to create many of the items we use today.


The Essential Process
Regardless of changes to the techniques themselves, the same basic principle applies to all plastic injection molding methods. Plastic particles are melted down and fed (or injected) by force through molds. These molds are chilled and this causes the plastic to harden. This chilling is accomplished by passing coolant around the mold so that the plastic can harden. After it hardens, it is ejected from the mold and is trimmed and finished so that it is ready for use.

Although an early form of plastic was invented in the 1850's, it was not until the 1870's that the plastic injection molding process was developed. Early forms of plastic were very difficult to work with and a more malleable form of the material needed to be invented. Shortly after this more malleable form was developed, plastic injection molding methods were also developed.


Plastic Content
One of the main changes has been in the materials which are used. Now, there is a greater variety of plastics that can be used in the injection molding process. Many of these plastics have different qualities that make them more desirable for certain applications. As well, it is also possible to add other materials to the plastic. This allows manufacturers to add coloring to the plastic and has given the industry much more versatility.

Molds are now available that are more complicated than they were in the past. Before, molds were usually created in two parts. One contained the molding cavity and the other piece was used to eject the finished product from the mold. Now, computer assisted manufacturing has allowed manufacturers to create more complicated molds that may have multiple sections. They are also able to add more detail to the sections of the molds.


The Essential Process Changed
The plastic injection molding process changed during the 1940's. Due to the war, there was a higher demand for many of the products that could be manufactured using this process. A screw-type plunger was invented which made the process easier to complete. This was perhaps the first major change that this manufacturing process underwent. This was also when the mixing of plastics and colorants was also developed.

It is amazing to think about how many of the products in our lives are made with these manufacturing methods. Whether we are at home, at the store or even being treated with plastic injection molding medical products, they surround us each day. It is only when we think of how many are created using this process that we begin to realize how important plastic injection molding actually is.