How To Choose The Right Used Injection Molding Machines

With so many used injection molding machines being sold on the market, choosing the right one for your business needs can be a challenging task. You cannot just walk in a shop and buy any used machine you come across. You need to make sure that the machine you want to buy is in good working condition.

There are a number of factors you should pay attention to as you look for the right used injection molding machine to buy. One of them is ejector stroke. Simply put, ejector stroke is the action of the machine pushing out the final workpiece from the platens using ejector pins. The ejector in the molding machine pushes against an ejector plate on the mold. Ejector pins or rods are attached to this plate and perform a pushing operation on the molded part once the plastic has hardened and the mold has opened.

After the action of molding the workpiece is completed, the mold opens and then the ejector pins slowly extend outwards, pushing the finished part 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 damage the final product while the pins that move too slowly may not fully eject the molded part.

You also need to check the tonnage of the used injection molding machines you want to purchase. This refers to the clamping pressure that the equipment delivers. The number of tons that a used injection molder is capable of producing when pressing the platens together is how experts measure tonnage. Make sure that it is enough to meet your company’s production needs.

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