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Rotary screen wrinkling stork print unit

Posted: Wed Mar 23, 2022 12:11 pm
by Blw offset/flexo
Hi all running 12c omet xflex with stork rs units printing wine and spirit labels
Anyone experienced issues with screens twisting wrinkling while running 10 mic white solid
units are calibrated to specs it’s a common issue across the pressroom 6 omets 10 different units
All the same issues

Re: Rotary screen wrinkling stork print unit

Posted: Wed Mar 23, 2022 3:20 pm
by vandium
Are these screens internally made? Is there an issue with improper gearing alignment during the build?
Is there a similarity in artwork causing issues?
Too much blade pressure? Too hard of a blade?
Ink too viscous?

Those are things to observe.

Re: Rotary screen wrinkling stork print unit

Posted: Thu Mar 24, 2022 12:42 am
by Blw offset/flexo
Yes all of the screens are made in house have tried multiple different inks and blades
Don’t think artwork would cause any issues from my point of view just a full coverage white rs first down on clear material 4 color process 2 pms flexo then rs unit running metallic then black flexo then rs unit with tactile then flexo matte and flexo gloss yes 3 rs units only the white has issues with wrinkles
We’ve tried different screen material checked for loss in air volume had manufacturer of units send their best tech’s to calibrate and still having the issue

Re: Rotary screen wrinkling stork print unit

Posted: Fri Apr 29, 2022 3:21 pm
by flexouk
Is the 10 micron the material thickness?

Re: Rotary screen wrinkling stork print unit

Posted: Thu Jun 23, 2022 10:27 am
by Carbon
Blw offset/flexo wrote: Thu Mar 24, 2022 12:42 am Yes all of the screens are made in house have tried multiple different inks and blades
Don’t think artwork would cause any issues from my point of view just a full coverage white rs first down on clear material 4 color process 2 pms flexo then rs unit running metallic then black flexo then rs unit with tactile then flexo matte and flexo gloss yes 3 rs units only the white has issues with wrinkles
We’ve tried different screen material checked for loss in air volume had manufacturer of units send their best tech’s to calibrate and still having the issue
The most recent Stork units have gears driving both sides. the older ones only have a gear driving one side and they are most likely to twist. as mentioned by a previous post excessive blade pressure can cause resistance and the screen rotation delayed causing it to twist. fact that its a solid white also takes away some of the support that the coating would have added. try using Gallus screen A-line RSA 10µ. very important is to ensure the white guide wheels are turning freely and they slide on their shafts side to side. only the springs should hold them in place.