Fan out compensation

[PUNEETRAZDAN]

we have a thermal VLF with Impos 2000 workflow.
we are facing a fan out problem in our Heat set press.
can any body suggest how we can use the fanout compensation option in Workflow & how we need to go about it in order to minimise registration problem due to fan out on press by using Impos 2000 software.Further more is it advisable to do a fan out compensation using software.

 

[Ultimate]

Impostrip is the solution

Impostrip is the solution

Our Impostrip solution has fan out compensation.
If you are interested to purchase it (free trial version initially), please contact us.
raymond @ imposition.com

Raymond Duval
Ultimate Technographics
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[Vee]

Our Impostrip solution has fan out compensation.
If you are interested to purchase it (free trial version initially), please contact us.
raymond @ imposition.com

Raymond Duval
Ultimate Technographics
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Yea that was a big help! Come on....

 

[Robert Dumas]

I must say that I have never heard of Impos 2000 but if it has a fanout (web growth) feature then you should be able to select the color(s) that are giving you problems and apply an anamorphic scaling from either the center of the signature or some other fixed point.

As for your question of whether using software is the right place for fanout compensation... if you have correctly adjusted your ink, water and ambient humidity then I suppose that software is the only place left to make a correction.

Kind regards,
Rob

[email protected]
http://www.polkadots.ca

 

[PUNEETRAZDAN]

Our impos 2000 software with screen vlf has the option of Fan out compensation it can do it in X direction & Y direction we have to feed some scale in % like 101% ???My question is how we must go about in finding the exact fan out & hw will it affect & change with various types of paper like LWC, GNP, SNP what is the right way to approach it.Is there a practical way to generalize an average fan out for all diff types of paper so that our workflow is also simple.
One way i have thought of is to put a vernier scale like in mechanical test form in center & edges of a normal job & measure the good printed copies.

Next question Is it right ,effective & practical to do a fan out compensation using this software or is it like opening pandoras box of trouble. (Press behavior from time to time ????)

could any one pls help me in deriving a right way to do it.

 

[Alois Senefelder]

re Fan-out on a web-offset press

re Fan-out on a web-offset press

Hello Mr Puneetrazdan, may I suggest that you read the PDFs I have posted, you control "Fan Out" on the Press.

Thread - Registration or doopid pressmen - January 09

Print Width -PDFs

Regards, Alois

 

[PUNEETRAZDAN]

Thanks Alois,
i have seen the pdfs in the thread suggested by u,it is related to how we can do tension control,water,etc. so that we minimize fanout on press. but my problem is that i think the pressman know that these factors should be controlled to solve the problem, i think they are unable to control it on press even after using buzzle wheels.
i have been told to experiment & do it with software, my concern is the same mentioned above if they cannot control it on press what is the gaurantee that a fanout compensation in software will help??
fan out will always be the same??
is it logical to do with software if yes how to go about it??
if no how to convince it will not help??

 

[PUNEETRAZDAN]

Dear Robert,
Name of the workflow is Pixel stream ver 5.5 with
a. Pixel Stream Impose Server 2000
b. Pixel Stream Impose Client

 

[Alois Senefelder]

re Fan Out # 2

re Fan Out # 2

Hello, Puneetrazdan, Put Vernier Targets on a production print run and see the variation ! -- Remember that "Paper " is a unstable material. Are you using a RGS on your web press ???


Regards, Alois

 

[SteveAgfa]

Actually Alois:

Agfa has a powerful tool within Apogee to compensate for web growth.
Without altering the origin files, we apply compensation at the 1-bit-TIFF
level - layer - by - layer to the output files.

It's quite a powerful tool, but perhaps not an answer to this original thread intent.

Regards,

 

[marktonk]

Using the Vernier Targets may help you calibrate, we use something similar on our Paper Stretch compensation on MetaDimension. We have 9 control points that we program into the rip and it is adjusted on the fly with MetaShooter. I would recommend you ask the party you bought the system from for their recommendations, they should be able to tell you how their sw works, what to use as a target and how to implement it. Good luck.

Regards,

Mark

 

[PUNEETRAZDAN]

Yes we are using RGS

 

[rich apollo]

Don't know your workflow, but web-growth compensation from the plating end can work very well. The simplest thing I can tell you to do is print a grid. Make sure it's 100% of all colors, ie "registration" color. Measure the distortion, and calculate your compensation.

We have Agfa's workflow, and use the web-growth compensation that Steve Musselman spoke of. It works well for us.

You are correct - different papers will react differently. And different web widths will react differently - as the web gets wider the distortion gets greater. You'll have to determine how specific your work requires you to get.

You'll also have to determine which direction to work. You'll key everything to the first or last color in your sequence. That color will have no distortion applied and the others will have progressive amounts of distortion applied to meet up with it.

You'll be dealing with pretty small numbers - so if it's handled by percentages expect to carry out past the decimal point.