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When referring to a check ring performance, you need to first determine what you can evaluate. Since all check rings leak, and the amount of leakage is highly dependent on the material, machine, and process, the amount of leakage cannot be easily tested.

What is important to evaluate is the consistency of the check ring leakage. Since an injection molder wants to provide a consistent product, it is critical that the molding machine deliver a consistent volume of material each shot during 1st stage fill. To test this consistency, the best method is the dynamic check ring repeatability test.

This test is covered in detail in the following post:

Evaluating Check Ring Performance…

-Andy

There is no industry standard for this, but it is a very important subject. One of the best strategies I see for this is to verify the clamp bolts at the same time routine maintenance is done to the mold. This means, when the machine is stopped to lubricate the components such as leaders pins, you can verify the torque of the bolts and levelness of the mold.

-Andy

There are only a couple manufacturers who produce all-electric molding machines at this size range and I provided those names. My suggestion was to wait until NPE2012 if possible, since it is likely that more manufacturers will join the ranks of the ‘big molding machine’ manufacturers.

-Andy

-Andy