Adhesive build up on press

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Adhesive build up on press

Postby Katherine » Tue Feb 20, 2018 4:29 pm

Hi all... We have been experiencing issues with self-adhesive label stock (PP/White paper/specialty paper/metalllic paper, etc.) in that the adhesive is coming out from between the liner and face stock during print runs and either clogging the rollers, creating print defects or creating high areas on our cutting dies, which in trun causes nicks in the support liner; causing web breakage.

Do Flexo plants in other parts of the world suffer from this issue, and does anyone have a good solution for it?

(We are located in Barbados, so we are always fighting the effects of high temperatures and humidity)

Thank you!
Katherine
 
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Re: Adhesive build up on press

Postby Fuzz » Wed Feb 21, 2018 3:31 pm

Nature of the beast. You can try to chill the web down. Anti stick coatings on the dies these days work really well. But mostly press operators will need to clean rolls periodically.
Fuzz
 
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Re: Adhesive build up on press

Postby BJH » Thu Feb 22, 2018 11:18 pm

Hot melt or acrylic? Both? when running hot melt adhesive, we spray the sides of the rolls with some silicone. It may not go away completely but it will definitely slow the build up.


Also check nip pressures aren't to high.
BJH
 
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Re: Adhesive build up on press

Postby Katherine » Fri Apr 06, 2018 4:11 pm

Thanks for the advise everyone.
Katherine
 
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Joined: Tue Oct 14, 2014 1:32 pm

Re: Adhesive build up on press

Postby udaykhose » Tue Apr 17, 2018 3:20 am

In some cases gum will be stick to the back of the liner it will cause the punch labels are directly stick to the back side of the liner while unwinding or labeling application.
the solution for this simply apply the silicon coating on the back side of the liner before printing, which help that gum will not stick to the backside of the liner.
udaykhose
 
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