Screen 8600 platesetter making mark on plate (think roller with teflon on ends is cau

[Danco]

SO recently showing up on our plates right where the coaster roller on top of image side is. the roller has some teflon tape on each end we are getting a small bar showing up that you can see on plate and on our printed publications.

has anyone had problems with this there are 2 lips where the tape meets. talked to our service rep says the tape is there so the roller does not contact as much yet the other short roller does not have it.

so we are getting a little abrasion i assume when it starts to move plate to pull it off imager drum and when it outputs plate. it is on a thicker plates .012 our .008 not so much plus 1200 dpi as opposed to 2500 dpi for sheet fed side .012 plates Agfa plates.

anyone experience anything similiar and or found a remedy.

Thanks

 

[Greg G]

The rollers are skidding on the plate causing the mark either because there is too much friction on the unloading table for the plate to move or the roller is too slippery.
First clean the rollers and teflon tape with roller cleaner and the unloading table with furniture polish to make the surface slick.
Cheap fix: If that doesn't work replace the teflon tape with several rotations of electrical insulating tape. The bar holding the roller can also be weighted down slightly to add friction to the roller.
Expensive fix: replace the offending roller

 

[Danco]

Thanks Greg,

Yeh the roller is $782 that is a little crazy.

Yeh we did most all of that, when they first installed it they put weight on it. We just pulled the lip part off of the tape so it is smooth all the way around, wonder why they do it that way a roller should be smooth all the way around and the next smaller roller just like this one does not have any teflon on it. We had talked about doing the electrical tape as well thanks for the insight, will have to do the furniture polish thing or silicone as well to help it slide better. Thank You !!! we will have to charge screen $782 for a genius simple fix they can put in their book or tell their service guys cause if they are charging $782 for a new roller that is just the same that is an expensive non fix maybe that is why they are so much nobody needs them. Just interesting Thanks for the Help wish would of found this forum earlier took us a few plates of testing and an unhappy customer to figure it out

 

[Danco]

So this is continuing to show up , slicked down the back side added the wraps of electrical tape, worked on proper pressure still getting a mark and now mark width of electrical tape so all guesses for us lead to that roller. amazing this is the non powered side of the roller. anyone else dealing with this situation. thanks for all advice so far, ran it with just roller still showed band mark width of teflon who knows maybe we are not even looking in the right spot but thinking cause it correlates it does. Just wondering if anyone else experiencing same thing or haven't noticed it before. stuff we are printing with solid colors in that spot it shows up sheetfed plates higher dpi, web press plates it does not as much, is this just a flaw in the machine, possibly cams dropping the rollers to hard etc. Thanks in advance