plastic mould, injection mould

The structure of plastic molds

I believe that everyone has certain understanding to plastic molds, but actually their structures are very complicated. If not a professional engineer, it is difficult to understand. The operation process of plastic molds is very interesting. I am very happy to share with you today about this knowledge. Let us know more about the structure of plastic molds.

Plastic molds comes in several different varieties, but can basically be described as forcing liquid plastic into a metal mold under high pressure. Most injection molding is done with high temperature molten plastic, and then it quickly cools inside the mold. The part is taken out of the mold, and then the process is repeated. The benefit of this technology is that thousands or millions of components can be made very quickly, and inexpensively. The downside of this technology is that the mold is usually costly. (lots of variables here- design life of mold, cycle time, etc) Usually you would use this technology to make thousands, or tens of thousands of parts- this makes the cost of the mold very small on a per part basis. 
There is another technology called RIM (reaction injection molding). These molds are less costly than the other, and in this process, cool liquid plastic is injected into the mold, where it sets up chemically like epoxy or fiberglass, only a polymer plastic. To begin along either one of these paths, you need to start with a product that is designed with molding in mind as the production process. There are many product details that may make a part easy or difficult to mold.


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