Method for making a lithographic printing plate
OwnerPaul Delabastita, Johan Van Hunselinventors
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Abstract
There is provided a method for making a lithographic printing plate from an original containing continuous tones comprising the steps of: screening said original to obtain screened data image-wise exposing a lithographic printing plate precursor according to said screened data, said lithographic printing plate precursor having a flexible support carrying a surface capable of being differentiated in ink accepting and ink repellant areas upon said image-wise exposure and an optional development step and optionally developing a thus obtained image-wise exposed lithographic printing plate precursor, characterized in that said screening is a frequency modulation screening.
Claims6
A method for making a lithographic printing plate from an original containing continuous tones comprising the steps of:
- screening said original to obtain screened data
- image-wise exposing a lithographic printing plate precursor according to said screened data, said lithographic printing plate precursor having a flexible support carrying a surface capable of being differentiated in ink accepting and ink repellant areas upon said image-wise exposure and an optional development step and
- optionally developing a thus obtained image-wise exposed lithographic printing plate precursor,
- characterized in that said screening is a frequency modulation screening.
A method according to any of the above claims wherein said lithographic printing plate precursor contains a photosensitive layer.
A method according to any of the above claims wherein said lithographic printing plate precursor contains a heat mode recording layer containing a substance capable of converting light into heat.
A method according to any of the above claims wherein lithographic printing plate precursor contains a silver halide emulsion layer and an image receiving layer containing physical development nuclei and wherein subsequent to said image-wise exposure said lithographic printing plate is developed using an alkaline processing liquid in the presence of developing agent(s) and silver halide solvent(s).
Dependencies are inferred from the claim text.