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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

How Plastic Injection Molding Methods Have Changed Throughout the Years

Are you someone who is interested in learning how objects are made? If so, you may be interested in learning about plastic injection molding methods and how they have changed through the years. Ever since the mid to late 1800's, this method of creating objects has been used in order to manufacture products such as toothbrushes and hair clips. Even items used in medical treatment can be created using these techniques.

 

The Heat and the Pellets

You may be surprised to learn that although there have been changes to plastic injection molding methods the same basic techniques are the same. Heat is applied to small granules of plastic. Once it has melted it is injected into a mold. The plastic hardens and, when it does, it is ejected from the mold. This hardening is normally achieved using coolant which passes around the molding chamber. Otherwise, it would be difficult to cool the plastic evenly and this could lead to flaws in the finished product. Any tags or excess plastic is removed and the product can then be used.


Many people think that plastic is a very modern invention and they are surprised to find it has actually been around in one form or another since the mid to late 1800's. Early plastic was very hard to work with and difficult to shape into different items. Inventors worked with the basic material and were able to develop a form that was more durable and easier to work with. Shortly after, plastic injection molding methods were also developed.


Although the basic techniques have remained similar in many ways, the materials that are being used have changed. Plastics are now available in a wider variety than they were when plastic injection molding methods were first developed. Now, plastics with different melting points are available and it is also possible to add different coloring materials and additives that give specific qualities to the finished product are also available.

 

The First Molds

Early molds were very simple. They had only two parts. The first was the section in which the actual shaping took place. The second was a section that allowed the finished piece to be ejected easily. Now, very complicated molds exist that may have multiple sections or parts.
It is interesting to note that it was not until the 1940's that plastic injection molding methods truly became popular. Because of the war, many different items were needed that could be created using these methods. In order to make the process easier to control and to make it possible to add different chemicals, the screw type injection process was developed.


When we think about how many products used in daily life are made using this process, the list may seem endless. It does not matter where we are, plastic items surround us everywhere. They allow us to maintain food safety and better hygiene, receive medical treatment and even perform acts of personal hygiene such as brushing our teeth and styling our hair. It is when we begin to think how many are created through this method that we begin to realize how important the process is.