Things To Consider When Purchasing Used Injection Molding Machines



If you have decided to try your luck in the plastic part manufacturing business, you should look for the right injection molding machine to use.  Depending on your budget, you can either purchase brand new injection molders or opt for used injection molding machines. Whatever you do, there are many things you need to consider to be able to choose a machine that will not let you down.

One of the important things you should consider is shot size. This is simply the maximum amount of plastic that the injection molder is capable of injecting into the mold cavity in one molding cycle. When selecting used injection molding machines, it is always good practice to choose a machine that can produce 30 to 40 percent greater shot sizes compared to what your parts require.

Another thing you should consider when choosing used injection molding machines to use in your business is the ejector stroke. Simply put, the ejector stroke refers to the action of the machine pushing out the final workpiece from platens using ejector pins. In the molding machine, the ejector pushes against an ejector plate on the mold. The ejector pins are attached to the plate and are responsible for performing a push operation on the molded part after the plastic has hardened and the mold has opened.

After the workpiece has been molded, the mold opens and the ejector pins slowly extend outwards, something that causes the finished part to be pushed out of the mold cavity.  The pin movement is timed with the mold opening, since the pins that move too quickly could impact the plastic workpiece and cause damage to the final product. If the pins move very slowly, they may not be able to fully eject the molded part.

For more tips on how to purchase used injection molding machines, visit our website at http://www.premierplasticsnj.com

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