Classification of Injection Molding Machines

In principle, of course, it could be stated that the size of the machine must be chosen in accordance with the size of the molded article the larger the molding, the larger the machine. But this isn t always true, especially where small molded parts are concerned. It is usually much more economical to manufacture many small moldings simultaneously on a large machine, than to manufacture just one article at a time on a small machine. 

With the CD, the projected area equals the circular surface formed by the CD. Because the diameter of the CD is 120 mm (4.75 in), the projected area is llScm (17.5 in ). 

The force acting against the clamping force, thereby attempting to part the parting force 

In order to achieve good quahty moldings, i.e. without flash, the mold parting force must be lower than the machine s clamping force. 

Lesson 1 provided an overview of the various materials which can be processed by injection molding. These materials have very different properties and must be processed imder very different conditions. For this reason, there exists also a wide variety of injection molding machines. However, aU injection molding machines are comprised of the same major modules. Examples of injection molding machines are given in the subsequent iUusIrations. 

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