Method of making a lithographic printing plate

Details Method of making a lithographic printing plate Method of making a lithographic printing plate

1998-06-24

1999-12-21

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430204, 430403, 396617, 396620, 396622, G03F 707, G03F 726, G03D 1300, G03D 902

Patent

active

060047275

ABSTRACT:
An imaging element (15, 122) comprising on a lithographic base at least one radiation sensitive or heat-sensitive layer composition, is image-wise exposed to radiation or heat. The composition is such that when exposed and developed, a lithographic surface is formed. The exposed imaging element is then passed through a closed treatment cell (26, 64, 66) in a processing apparatus in which the imaging element is brought into contact with a single developing fluid (44, 124). The closed treatment cell (26; 64, 66) comprises a housing (24; 114) having an entrance (28; 116) and an exit (30; 118) each closed by a path-defining roller (32; 128) in contact with a reaction surface (33; 130) to form a nip (34; 136) therebetween, through which the plate path (36; 72) extends. Sealing means (38; 138, 139) seal each path-defining roller (32; 128) to the housing. Evaporation, oxidation and carbonization of the treatment liquid is significantly reduced and quality control of the plate is possible before mounting on a printing machine.

REFERENCES:
patent: 5210005 (1993-05-01), Takekoshi et al.
patent: 5313242 (1994-05-01), Devaney et al.
patent: 5689750 (1997-11-01), Verlinden et al.
patent: 5737662 (1998-04-01), Verlinden et al.
patent: 5799224 (1998-08-01), Verlinden et al.

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