Nox-Rust Paper

by Brian
(east troy, wi)

Question: What problems other than a visual indicator could be caused by using nox-rust paper on the back plates of injection molds?

My answer:

I wouldn't expect any problems provided the paper covers the entire back plate surface so when clamp tonnage is applied tie stretch is even in all 4 bars.

Steel shim is sometimes placed in localized areas between the back plates and machine platens to try to counter act part flash. In the short term it doesn't appear to cause any problems but in the long run it is likely to break tie bars and damage the platen.

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