Piling on Ryobi 3404-DI - UV

[Tomatron]

We have been fighting with this since we installed this press. we tried several inks and so far the best results are from T&K Toka. This ink is extremely resistant to toning. We run as warm as possible without toning (27 - 28C) but still get piling on the plate. If the pressman wipes the plate it goes away for about 700 imps. and slowly comes back. Press is packed with .004" - .005" plate to blanket squeeze. Room is climate controlled, tried several different blankets, presstek and Vim plates.
Please see pic. attached.


Cheers,
Tom

 

[Litho]

Are your blankets set to the correct pressure for the stock your running? Are the blankets packed right to .028? Is it just on the black unit or more? We use Toyo inks with Day blankets and don't have any major issues, we also turned down our chiller just cause we don't have exactly the perfect environment till we get into our new shop. Only time it really happens to me are when my blankets are sticky from being worn out so I either replace them or give them a quick wipe with rubber rejuv to get through the job.

 

[Tomatron]

Litho, thanks for the reply, yes the blanket pressure is set correctly. It piles on all units but only on the plates. No piling on the blankets. Are you using U.V. inks? My understanding is that the inks for the conventional DI work way better and there only a handful of U.V. DI presses in North America. For this reason the ink companies don't do a lot of R&D into this technology.

The press is packed with .028" which puts us 4.5 thou over bearer after gauge loss.

Cheers,
Tom

 

[macke]

Be Careful

Be Careful of turning down the chiller... it also cools your electrics, not recommended.