Direct-imaging flexible offset printing plate and method of manu

Details Direct-imaging flexible offset printing plate and method of manu Direct-imaging flexible offset printing plate and method of manu

1978-01-19

1980-05-27

Brown, D. Travis

Radiation imagery chemistry: process, composition, or product th

Including control feature responsive to a test or measurement

96 15, 96 33, 101465, 1014631, 430 56, 430302, G03G 504, G03F 702

Patent

active

042048656

ABSTRACT:
A flexible offset printing plate is formed from a directly imaged electrophotographic member comprising an inorganic coating of a photoconductive material on a polyester substrate. The photoconductive material is an oriented crystalline deposit about 3000 Angstroms thick which has been directly sputtered with radiofrequency energy in a process using a Langmuir sheath to produce a light sensitive, readily imaged abrasion-resistant, transparent coating. It is deposited on a sheet of dimensionally stable, transparent polyester film having a thickness of about 0.005 inch with an intervening sandwiched layer of ohmic material such as indium-tin oxide about 300 Angstroms thick. The transparency of the ohmic layer and the photoconductive coating on a transparent substrate result in a transparent plate.
The electrophotographic member is imaged by charging, exposure and toning with a suitable toner. The non-imaged parts of the surface are rendered hydrophilic (having a strong affinity for water and repellant to greasy ink) by suitable chemical and/or mechanical treatment while the imaged and toned parts are rendered hydrophobic (water-repellant and having a strong affinity for greasy ink). This may simply comprise choosing a type of toner which is inherently hydrophobic. The plate is mounted in an offset press and printing effected as though it were a conventional offset plate using the usual grease- or oil-based inks.

REFERENCES:
patent: 3309990 (1967-03-01), Klupfel et al.
patent: 3460476 (1969-08-01), Swigert et al.
patent: 3547627 (1970-12-01), Amidon et al.
patent: 3607255 (1971-09-01), Back
patent: 3697268 (1972-10-01), Ohta
patent: 3907562 (1975-09-01), Crystal
patent: 3926762 (1975-12-01), Goldstein
patent: 4025339 (1977-05-01), Kuehnle
Lagnado et al. RF--Sputtered Cds.--Thin Crystals p. 318-321, J. of Vacuum Sci. & Tech. Mar.; 1970.

Affiliated with

Also associated with

Rating

Direct-imaging flexible offset printing plate and method of manu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct-imaging flexible offset printing plate and method of manu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct-imaging flexible offset printing plate and method of manu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1117935