Plate Chemistry

[moghan]

Can any one give me the name of the chemicals present in thermal CTP Developer?

 

[prepressdork]

That would depend on the plate you are using. Some thermal plates require a developer, a replenisher, and a finisher while others may only require a finisher assuming they are chemistry free.

pd

 

[Fatboysmart]

I haven't used any chemistry for almost 10 years now, just whatever chemistry is used on the press itself.

 

[aqazi81]

I haven't used any chemistry for almost 10 years now, just whatever chemistry is used on the press itself.

Please tell us what chemistry you are using on the press.

 

[Fatboysmart]

Please tell us what chemistry you are using on the press.

Lol... I don't know, I'm not a printer... mainly demineralised water and some additive that all printing presses use. My point is, chem-free plates work well for us, straight from the image setter onto the press.

 

[Alois Senefelder]

The Chemistry of Lithography


aqazi81,


The plate manufacturers have "Bamboozled us !!! and put the onus on....... "The Chemistry of Fountain Solutions " for the

plates to work successfullly on the press ----- just try printing with H2O !!!!!!!!!!!!!!


Regards Alois

 

[aqazi81]

The Chemistry of Lithography


aqazi81,


just try printing with H2O !!!!!!!!!!!!!!


Regards Alois

I tried but there was nothing on sheets at delivery.

On a serious note, Do you really think that we can print with just H2O, no additives, on continuous feed dampening?

 

[Risu]

[On a serious note, Do you really think that we can print with just H2O, no additives, on continuous feed dampening?[/QUOTE]

Some polyplates works just fine with 100% H2O

 

[Alois Senefelder]

aqazi81,



You misunderstand my comment "try printing just with H2O" NO you cannot print just with water in the long run,

Chem- free/ DoP plates do not have the necessary "Desensitized Layer" this layer "One micron thick" NEEDS to be

Induced on the plate during the Image development step.


The only plates that ran successfully with just H2O were "Deep Etch Plates" then only a max. of 10.000/20.000 sheets

before Scumming appeared,


Remmember aqazi81,

It is all about maintaining the Diffferent Inter- Facial Tensions on the on the - Induced Layers - 1) Hydrophillic 2) Oleophilllic


Regards, Alois