U.V online through offset

[saurabhverma]

Dear All

I have to do u.v through ink duct (offset) , is that possible to do spot u.v through ink duct. What is the method to do u.v through duct.

Regards
Saurabh

 

[Cornishpastythighs]

If you are trying to do High Gloss spot UV coating through the printing unit using the roller train and dampening unit with a litho plate I have yet to see this done. Most commonly Spot UV is done using a Photopolymer plate via a Anilox or Roll coater unit. There are some ink duct UV Gloss varnishes available that may serve your purposes but if you want Gloss values of mid 90's then UV Coating would be my recommendation. Good luck
my 0.02pence worth

 

[REYES1377]

It will not work well or at all. It would be cheaper in the long run to buy it out. Have it done off line.

 

[chevalier]

We have experimented with various UV coatings and UV varnishes. The UV gloss varnish is as glossy as an AQ gloss coating but we cannot get it anywhere near the gloss value of an UV coating. I think this has a lot to do with the missing in the roller train in a print unit vs. the very simple anilox roller train in our coating unit. We have Cyrel plates made or photopolymer plates adhered onto a coating blanket for our coating unit when Spot UV coatings are required.

Has anyone tried running a coating through a print unit on an anliox press?

 

[Ret Heidelberg Instructor]

Ret Heidelberg Instructor

Ret Heidelberg Instructor

In the early 80's I worked for a packaging outfit that was using a UV application on Detergent Packaging. They ran UV Varnish into the ink fountain and through the ink train on a 5 color 60" Meihle. Looking back on it now I woiuld say it was a pretty bad method of applying UV. They used metal relief plates to to transfer the varnish onto the blanket in the last unit and then it hit the UV lights to get cured. It worked, but it was messy had an obnoxious order that stays with you and was dangerous. Back then people were not aware of the dangers of the chemicals in the UV varnish and what long term exposure to the varnish and the UV lamps could do to their health. You cannot get away with this crap today although some places still do. You are better of with a dedicated unit that is properly configured and ventilated that is in-line, or as previous contributors stated get a dedicated unit and do your coating off-line.