Back from Drupa. The Landa booth was impressive,Big show, lots of promises. The samples (under Plexiglas)were absolute trash, don't know why they even displayed them. Of the six presses none were producing printed sheets. $10,000 Euros, letter of intent gets you on a list???
The quality issue is one that bothers me. There have been lots of comments about the poor quality of the print but it would be nice to have more specific descriptions of what makes the print poor quality. Just curious about this.
So instead of shipping plates the vendor would simply ship the coating. A much less expensive endeavor.
The SP press worked great.
Except for one little detail.
And that killed the project - the spray powder in the press migrated to the coating causing small white specs in the presswork.
You can see a video of the press being demonstrated here:
The Print Guide: The Wayback View – SP Plateless Offset Technology in 2000
best, gordo
A good story Erik.
Your point is well taken. It reminds me of the Creo SP press that was demonstrated at Graph Expo in 2000. The notion was to essentially eliminate plates on a conventional offset press. Rather than coating CtP plates and shipping them, this press used a reusable aluminum plate wherein the plate coating was sprayed onto a reusable plate on press. Then exposed by laser, washed and then inked and printed. When the printing was complete the coating was removed and the plate recoated and exposed. So instead of shipping plates the vendor would simply ship the coating. A much less expensive endeavor.
The SP press worked great.
Except for one little detail.
And that killed the project - the spray powder in the press migrated to the coating causing small white specs in the presswork.
You can see a video of the press being demonstrated here:
The Print Guide: The Wayback View – SP Plateless Offset Technology in 2000
best, gordo
But in offset, water in the ink train, since it is not an intentional input to the ink roller train, is thought of as a pesky foreign intruder.
in offset, the water in the ink train has a variable effect on the transfer of ink from the fountain to the roller train. And thereby hangs a long sad tail...
Al
Water in the ink train is at best tolerated, and here much credit goes to the ink manufacturers who have striven to increase this tolerance.
True control of the water in the ink train would have to target that transfer point in the same sense that the ITB targets the ink transfer from the fountain to the roller train.
I lack the imagination as to how this could be addressed. Perhaps a non contact, jetted transfer of the ink to a wet plate, with the excess ink picked up by series of scavenging form rollers? Seems like a project for you.
Al
Frankly, I am expecting that the water can be just dripped at a controlled rate into the roller train near the ink fountain once the ink is controlled. Will have to wait and see. I don't want to get into anything that is overly complicated. I am trying to simplify as much as possible.
D Ink man said:The obstacle to overcome is 3 major and most important factors in any lithographic pressroom.
Would anyone like to hazzard a guess as to what those 3 factors are?
But Erik, this last suggestion of yours still leaves open the way for the water to get to the ink train via the ink form roller contact with the wet plate.
By comparison, in my 05-13-2012 12:11 PM post I was trying to deny that avenue for the water to migrate uncontrollably to the ink train. Only then could you try to transfer water to the ink train in a controlled fashion.
You see, I have learned something from the ITB.
Al
The perfect lithographic ink has not been formulated yet. I know what needs to be done to approach that perfect ink.
The obstacle to overcome is 3 major and most important factors in any lithographic pressroom.
Would anyone like to hazzard a guess as to what those 3 factors are?
See we're still working on litho, now Nano rears it's head. Wow!
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