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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

Plastic Revolution

Plastic Injection molding revolutionized the manufacturing industry, many items that were hand made with metal, wood,or simple with machinery. Now with the advent of recently developed plastics, a whole new new world of manufacturing world was born in the last 50 years.

The machinery process now used a type of plastic or polymers to create a wide variety of items that you use on a regular basis. These items include but are not limited to small appliance casings, buttons, vehicle dashboards, as well as exterior parts for cars and trucks. This process and the accompanying plastics revolution has really changed the world.

What Happened to Messy Plastic Parts Edges?
The actual process and the way it works is very complicated but is a very simple idea. Melt the polymers or plastics through a heat tube and fill a mold of one type or another, creating a desired shape with the required size and strength. As you can see, it's very similar to making candles or other mold artifacts. Many are curious as to why the products always look so uniform. It's because unlike human error in making a mold, computers are used to make them. In fact, within the process this is one of the most important jobs, otherwise the same imperfection would happen over and over again.

In fact, many adults will remember when fine lines and edges would be left on the finished product, such as lines or unfinished edges. In fact, many have taken and shaved the plastic off of these incomplete edges of new toys or other items. This is because when the process was first beginning the molds were often in separate pieces that would be anchored together at a later time to make a complete piece.

Computer Technology and Molds
The molds for today's plastic injection molding are computer engineered in order to make products more uniform. While it's done with computers, don't think for a minute that it didn't take an engineer to design the item in the first place. This is why you don't see the pieces of extra plastic left over any more.

The material or polymers that are used today vary considerably. In fact, today's plastics are no longer just one simple polymer, but more a mixture of several according to the strength and flexibility of the object desired. A lady's flip flop sandal would take a completely different polymer mix than say a bumper for a car or truck.

The Essential Catalyst: HEAT
The one single thing all of them have in common is heat. While the temperature is high in order to make the polymer fluid, almost everyone at one time or another has seen plastic parts melt from being left in a car or other intense heat area. This is because each polymer has a different melting point, and some, such as plastic spatulas will be high, while others such as a plastic throw away cup would not.


As you can see, plastic mold injection has changed and revolutionized the world as we know it. Before, most items were made by hand with natural materials, and there's no doubt hand made items are beautiful, but in today's world they're not cost effective. This process has not only made many products cheaper and stronger but also, less expensive. This gives us a variety of useful items, quickly made, that you wouldn't want to do without.