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When I check for fibre tear at the end of my
laminating line, I find that satisfactory results are obtained on one
side of the sheet but not the other? Why is this?
There are a number of factors that may cause
this. The most likely is an uneven adhesive coat weight across the
sheet. The higher coat weight areas will give slower fibre tear
development than the lower coat weight areas. Solution is to adjust
the rollers, and/or check the roller bearings for wear. Less likely,
but possible, causes are variations in water content across the virgin
board, or variations in board thickness.
I have a roller application system and
recently my adhesive, which I have used for a long time, has begun to
thicken and skin badly. What do I do?
Check the temperature of the adhesive on the
machine. A bearing may have gone on the roller that is causing a
temperature rise of the adhesive through friction. If the adhesive is
fed to the roller via a flat tray, try to minimise airflow across the
surface of the adhesive. The best way is to fit a lid to the tray if
this is practical. You should also check to see if there is a heat
source or fan near the machine that directs heat and/or an airflow
across the adhesive. Move this if practical.
My laminated boards are not flat
Curl in laminated products is caused by unequal
expansion and shrinkage of the two ply’s. Reverse stacking can help to
counteract curl. Alternatively Pafra can supply special low curl
laminating adhesives. Contact Us
My final board is too wet
Apply the minimum adhesive that still gives a
good bond. If there is still a problem request advice on Pafra’s
laminating range. Contact Us
When I make laminate reel to reel it is hard
to keep register of front to back print.
Your adhesive may be too slow, Pafra have a range
of adhesives from very fast to very slow performance types.
Contact Us
My board will not bond unless I run slowly.
Try a lower coat weight or speak to Pafra about a
faster setting adhesive. Contact Us
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