GM · CONVERTING UNIT
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20.
Lamination (Tips and tricks)
If you have fish-eye's in the laminate it is normally a sign of lack of adhesive in some points.
Tricks for for self-adhesive laminates
a) Make sure that the lamination roller is clean and flat. No dirt on sides. Run 3-4 bars pressure.
b) Increase pressure on center nip roller to 5 bars - then it works as a "2
nd
lamination roller"
c) Check substrate after 24 hours. Does the fish-eye problem go away over time?
d) Run a clean substrate in the machine (not printed) and check if problem goes away.
Tricks for UV laminates
a) Make sure that the lamination roller is clean and flat. No dirt on sides. Run 3-4 bars pressure.
b) Check that the right side of lamination is used (it is only treated on one side)
c) Check that lamination foil is wider than substrate or anilox has deadband preventing varnish build up
on the sides of the lam roller. If the varnish build up on the sides of lamination roller, then the lamination
roller will "grow big" on the side and fail.
d) Check that anilox volume is high enough - simpel test: run without doctor blade - this will put down
30cm3/m2 of glue - more than needed for all laminates
e) Check substrate compatibility. Simple test. Put down glue without lamination.
Rewind substrate. Run it again and this time putdown glue and lam. If this fix the problem, the substrate
is too open for lamination (must be primed)
f) Check for oil from the press. Turn off oily web and clean all press rollers. Run 1000 feet in press
before starting test. Test if lam works without the oily web turned on.
