Poly board and Colour Standard Variation

[ColinD]

Greetings all,

We are a packaging converter producing folded cartons for the frozen food industry printing on double sided Poly board which is not covered in paper types under the ISO12647-2 standard.

We are encountering a lot of problems where clients are expecting extremely tight tolerances in colour variation which in many of the cases is below 2ΔE, so my question to other packaging converters (even press manufacturers) who print on Poly board is how are you managing the challenge of colour variation on poly board, what is your accepted tolerance for ΔE variation and do you even apply the ISO standard to this board type or perhaps have adopted your own "in-house" standard?

Many thanks
Colin Doyle

 

[Cornishpastythighs]

We used to produce our own visual Standards/ Lights /Dark colour standards. We produced them during the run by increasing/decreasing the colours overall slightly and we sent them to the customer to sign off on the tolerences. We only used them for PMS colours as trying this with process colours is almost impossible. Using delta e can be a bit tricky as some colours show visual variation more than others even with good numbers. Printing on poly is tricky as the dampening solution is not absorbed into the stock and can affect the colour of downstream units.
Are you using any closed loop colour controls on your presses

heres a old post about this very subject

https://printplanet.com/threads/making-color-standard-book-with-light-standard-dark-in-offset-printing.266403/

 

[ColinD]

We used to produce our own visual Standards/ Lights /Dark colour standards. We produced them during the run by increasing/decreasing the colours overall slightly and we sent them to the customer to sign off on the tolerences. We only used them for PMS colours as trying this with process colours is almost impossible. Using delta e can be a bit tricky as some colours show visual variation more than others even with good numbers. Printing on poly is tricky as the dampening solution is not absorbed into the stock and can affect the colour of downstream units.
Are you using any closed loop colour controls on your presses

heres a old post about this very subject

https://printplanet.com/threads/making-color-standard-book-with-light-standard-dark-in-offset-printing.266403/

Hello Cornishpasty

Many thanks for response, yes we are currently using closed loop with the Inkzone system on MAN R700 presses.