We've been printing glass coasters for years but sometimes find paper sticks after pressing. We either have to spend minutes washing them under water trying to scratch paper off or waste coaster and use another. Never figured out the reason. Bad coating? Too much pressure?
Any ideas folk?
If it helps we press glass at 190c 3.5min (210s) low/medium pressure with teflon sheet above and below with glass placed on press on top of paper of course (design not reversed). The design always prints perfectly but after cooling some coasters come away cleanly and others bonded to paper.