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Telegraphing through HPL6/8
We are a company that specializes in building large boardroom tables. We have been getting more jobs that are in laminate. We use MDF substrate. We spray Wilsonart 731 contact cement out of a pressurized canister. We use a unijet 6501 spray tip. After we apply the laminate to the face and back we press the panels in a hydraulic press instead of rolling by hand. Every time we are experiencing telegraphing of the contact cement through the face laminate. We are currently investing in a pinch roller. Are there any ways we can completely eliminate the telegraphing?
If you have a press ,why are you using contact, why not a pva glue?.
Having done thousands of (Kitchen) mica tops ran through a Marbel 60" open end pinch roller the spray pattern will show.
Kitchen tops don't have to be as critical.
I'm Kyle's boss. The reason we don't use PVA in the press is because we had issues with panels coming out warped/bent - I think this was due to moisture from the glue being trapped in the substrate. That is a big problem when making table tops.
TomC - thanks for the feedback. Anyone else have any ideas? Any of you in the Mid Atlantic region willing to come and see what we're doing and tell us what's wrong? I'll gladly pay a consultant fee.
We have used PVA white glue for years and almost never have a warping issue. You need to make balanced panels using same thickness laminate on top and bottom of panel (bottom side can be reject or different color material).
We have a panel cleaner, glue spreader and press this gives us a dimple free panels.
When we use contact we sometimes get track marks on panels from edge bander, with a pva glue you get a hard glue line and no marks. PVA glued up panels much better product.
WA 730 should have a smooth pebble pattern. WA 730 should never have a "web" pattern. WA 730 should not contribute to telegraphing.
If you are using a thin laminate, consider a thicker one.
We use epoxy or a marine polyurethane glue when we press laminate with our hydraulic press. With those products, there are no moisture/warping issues. Also, you could experiment with turning down the pressure to a minimum. We had a telegraphing problem which was solved by reducing the amount of glue and lower pressure.