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US 2003/0211429 A1Published application
Method and apparatus for refreshment and reuse of loaded developer
AssigneeKodak Polychrome Graphics LLC
InventorsUlrich Fiebag, Hans-Joachim Timpe, Uwe Tondock, Andreas Vihs
Life of this patent
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Abstract
A method and an apparatus for the refreshment and reuse of loaded developers used in lithographic printing are disclosed. The pH of an aqueous, essentially silicate-free loaded developer is reduced to below about 11. Insoluble material is separated, and the pH increased to about 12.0 to 14.0 to produce a refreshed developer. The refreshed developer may be used to develop additional exposed printing plate precursors.
Claims25
A method for refreshing a developer, the method comprising the steps of:
- (a) developing an imaged printing plate precursor with an aqueous, essentially silicate-free developer having a pH greater than about 12, and producing a loaded developer comprising loaded solids,
- in which:
- the printing plate precursor comprises an imageable layer over a hydrophilic substrate,
- the imageable layer comprises a polymeric material,
- the polymeric material is either (i) dispersible in an aqueous solution that has a pH of about 12.0 to about 14.0 or (ii) soluble in an aqueous solution that has a pH of about 12.0 to about 14.0 and insoluble in an aqueous solution that has a pH below about 11.0,
- the loaded solids comprise the polymeric material, and
- the loaded developer has a pH of about 12.0 to about 14.0 and a loaded solids content of about 0.1 wt % to about 10 wt %;
- (b) lowering the pH of the loaded developer to below about 11.0 and producing a liquid whose pH is below about 11.0;
- (c) separating insoluble material from the liquid produced in step (b) and producing an essentially colorless liquid, in which the insoluble material comprises material dispersed in the developer, a precipitate formed in step (b), or a combination thereof;
- and
- (d) raising the pH of the essentially colorless liquid to about 12.0 to about 14.0 and producing a refreshed developer.
8 more elements
An apparatus for refreshing loaded developer, the apparatus comprising:
- a first tank connected to a source of the loaded developer, the tank comprising a developer level sensor;
- a source of acid connected through an acid dispensing valve to the first tank;
- a first controller connected to the valve, the controller adapted to turn the valve on and off on command from the sensor in the first tank;
- a fluid/solid separator connected to the first tank through a discharging valve;
- a first conduit connected to the fluid solid separator for directing separated fluid from the fluid/solids separator to a pH treatment tank;
- a second conduit connected to the fluid solid separator for directing separated solids to a solids receptor;
- a source of a basic solution connected through a basic solution dispensing valve connected to the pH treatment tank;
- and
- a second controller connected to the basic solution dispensing valve, the second controller turning the basic solution dispensing valve on and off.
6 more elements
Dependencies are inferred from the claim text.