AQ Issue

[gman]

When appling AQ why does it take out the magenta (lessens the color) Gman

 

[gordo]

When appling AQ why does it take out the magenta (lessens the color) Gman

The primary factor causing ink pigment burn-out is the incompatibility between certain non-alkali resist ink
pigments (e.g. Rhodamine Red, Warm Red, Rubine Red) and high-alkaline or high-amine (ammonia hydroxide) aqueous coating formulations reacting with the captive heat, oxygen deprivation, and pressure within the printed load.

Some solutions include
• Use alkali/fade-resistant pigments.
• Change to a low-amine or heat-resistant aqueous coating with as low a pH as possible (less alkaline).
• Wind the printed loads as soon as possible to reduce unnecessary exposure to high heat builds captive in the pile.

best, gordo

 

[mazengh]

The primary factor causing ink pigment burn-out is the incompatibility between certain non-alkali resist ink
pigments (e.g. Rhodamine Red, Warm Red, Rubine Red) and high-alkaline or high-amine (ammonia hydroxide) aqueous coating formulations reacting with the captive heat, oxygen deprivation, and pressure within the printed load.

Some solutions include
• Use alkali/fade-resistant pigments.
• Change to a low-amine or heat-resistant aqueous coating with as low a pH as possible (less alkaline).
• Wind the printed loads as soon as possible to reduce unnecessary exposure to high heat builds captive in the pile.

best, gordo

how do you wind a pile? a pile turner with blowers? or is there a better solution?

 

[gordo]

how do you wind a pile? a pile turner with blowers? or is there a better solution?

Winding a bit difficult to describe. Basically some one in bindery takes a small pile of sheets and jogs them to get air between the sheets then repiles them. Someone in your bindery dept should know how to do this.

best, gordo

 

[mazengh]

i think this can be done using the polar pile turner... i.e. airing and jogging

 

[gman]

Gordo, thanks for your reply, I understand your answer and gave this answer to the pressman having the problem. The problem is he (pressman) did not grow up in printing. He has been involved for 20 yrs., more or less and whatever he learned was on his own. He does however figure things out for the most part. I do respect your opinion been in the trade 40+,maybe someday he"ll try it. Thanks Gman

 

[gordo]

The problem is he (pressman) did not grow up in printing. He has been involved for 20 yrs., more or less and whatever he learned was on his own. He does however figure things out for the most part. I do respect your opinion been in the trade 40+,maybe someday he"ll try it. Thanks Gman

Well that's a different problem. Experience has, IMHO, nothing to do with it. Some people will not change what they are doing unless the problem impacts them directly or unless they see a benefit to themselves in solving the problem. It appears that the press operator isn't having a problem, therefore he sees nothing to solve. You have the problem - he doesn't.
If the problem of the Magenta is causing cost issues for the company (e.g. customers complaining, extra proofs, increased wasteage, profit loss, etc.) then there is an opportunity to bring the issue to upper management and get it resolved.
Economic arguments are very effective in generating change, especially when presented by management.

best, gordo

 

[gman]

Thanks gordo, yes I guess it is me sticking my two cents in, just thought I could help by asking questions. At least you made me laugh have a good one thankyou, gman