Web Press "Step" program for registration?

4sight

Member
Hello,
I am being asked to research a "program" or "Step" application to aid in web press registration. I am not familiar with any software solution.
I was brought a press sheet with misregistered KO type on a 4/C image. This is on 40# text. The problem will get worse with lighter weight paper.
I was told a "step" program would solve this issue. Does this sound remotely familiar to any "old school" web guys out there? Can you enlighten me?

Thanks for your input!
 

SteveSuffRIT

Well-known member
You print a register grid test form, scan it, then software adjust for any distortions (fan out).
I think Heidelberg has a version.
 

chriscozi

Well-known member
Wow.
Lots to unpack in this problem.
Gordo is correct.
Web press registration issues can and are machine and substrate specific.
If 'they' want you to solve the issue you mention with 'software' I would tell them that the issue needs to have exact parameters.
'It doesn't fit.' is not an exact parameter. The exact parameters are on the resultant out of register sheet.
And as you mention the sheet specifications change and the parameters change.
So in your efforts to quantify the parameters you will learn what you need to 'step' (this is not the correct term - I would use 'distort') to fix the issue.
Then you can research the options available to 'fix' it.
So if you've done the work to quantify the parameters then you can use software and OPERATOR JUDGEMENT to correct the problems.
No easy quick fix.
Good luck.
 
Sounds like you’re dealing with some paper roll stretch, or flare from unit to unit. It’s going to be especially noticeable on lighter weight stock and in knocked out images, and, once it appears, it’s usually consistent. I’ve seen where a ‘step’ program is indeed something that’s in the software of the plate output but you need to add it in there and select it before plating (the step term refers to a gradual increase in compensation from unit to unit). The good news is that it does actually make a difference and it should correct the problem.
 

4sight

Member
Thank you so much for the info! I have some homework to do. So this application is installed on press or is this a prepress solution? Are the register test form grids something I need to acquire or create myself?
 
Last edited:

Alois Senefelder

Well-known member
Hello 4sight,

Before we stray into the "Realms of ??????"
We need to know the following -
1) Heatset/Coldset Press? 2) How many Press Units? 3) What other ancillary equipment on the Press - Reelstand, Infeed. Dryer, Folder etc.

Regards, Alois
 

jshawy

Member
Thank you so much for the info! I have some homework to do. So this application is installed on press or is this a prepress solution? Are the register test form grids something I need to acquire or create myself?
It is prepress software solution. Which way is the register out? Lateral(web growth) or circumferential?
Most web offset printers prepress departments will have 'web growth' settings for different stocks and machines. This will compensate for the lateral register which the bussel wheels can not.
Circumferential register issues is different ball game. let us know.
 

turbotom1052

Well-known member
Considering the wide variations in paper qualities companies choose to print on I can not see a one size fits all solution to this problem.
 
I’ve seen where (in a production environment) there’s more than one flare ‘compensation’ that can be selected in plating. So, depending on how severe the stock flare is when setting it up on press, the operator would just have a new set of plates made according to that. It works because once you see the paper distortion on a certain substrate, it’s usually consistent enough throughout that run to stay with whatever compensation is chosen.

Given that this was a fairly common practice and used on some runs that were in the hundreds of thousands, I can’t imagine this being unheard of anywhere else. And it’s definitely not as complicated as some might seemingly have you believe. While it’s maybe not always an exact science, it does produce a sellable product and it’s far better than doing nothing at all.
 

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