Printing large format on windmill


I have to print a case for chocolates on a heidelberg windmill 10x15.
The plate is in A4 format (magnesium). I have difficulties to have a regular pressure on the whole sheet (paper 300g) - there are many elements (types, lines, pattern). My client wants deep impression. Do you have tips for printing “large” format on windmill ?
Thanks for your help!

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I was never and never will be a fan of deep impression.
That’s a large area to hit that hard. I’d assume that it’s something as heavy as chip board? To avoid crushing your cut, I’d recommend using a softer paper then glueing it on your box. Paper that would make it look like deep impression but not hitting that hard. Remember limits of your press.

Here is a sketch I made a while ago to depict the 10x15 Heidelberg’s limitations. It was part of the instruction for the designers.

When I asked one designer: “did you read the instructions?”
The reply was: “of course NOT

Designers/customers don’t care, they just want to push the job trough the least expensive trade printer. There are different presses, some of them are better suited to certain things than the others. If you break your press, the only thing the customer will and can say is: “I am so sorry”.

For example; I know about the nickel gauges and the Heidelberg quoted minimum size. But, for the very few $ the customer would save on the paper cost, I refuse to complicate my work. Hence my minimum size is much bigger.

Perhaps, break-up the image in to two passes. Be careful that the page curl let’s you feed the sheets easily for the second time. The doily like image in the picture acts pretty much as a solid with a big CLUNK while pressed.

You need one of those John Thompson platens that were discussed here a week or so ago — or to run the job on a good strong cylinder press.


Thanks Louie Dudas, it’s the good way ! Your picture on fb is perfect :)

The 10x15 Heidelberg is probably not suited for this project, a 13x18 yes. I’ve posted this link before showing this type of work that was done on a Heidelberg cylinder:

where a deep impression was used to advantage to produce a very distinctive printed image. Photopolymer plates are expendable vs. metal type, and if a press is built to do diecutting as part of its expected performance, then deep impression is not an undue use of the equipment, within the capabilities of any given press.