I am looking for advice on molding a nylon cover to a bearing. I have been, up until this point, molding the nylon roller cover separately and then press fitting the bearing to the cover. We have recently had a few issues with the nylon cover expanding too much over time and then separating from the bearing.
We then decided to amend the tool so that we could mold the cover directly to the bearing. the issue we now face is that the nylon is getting into the bearing. We have changed the bearing from a ZZ (metal cover both sides) to a 2RS (rubber seal both sides). the nylon is still squeezing in past the rubber seal.
Is there anyone who has experience with molding directly to a bearing? What could we do to alleviate this issue?