Printing – Rolling contact machines – Rotary
Reexamination Certificate
2002-04-12
2003-09-16
Hirshfeld, Andrew H. (Department: 2854)
Printing
Rolling contact machines
Rotary
C101S415100, C101S217000, C101S382100, C101S378000, C492S028000, C492S049000, C492S052000
Reexamination Certificate
active
06619200
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates both to a method for obtaining a sleeve for mounting flexographic printing plates, and to the sleeve itself.
Italian patent 1,293,502 describes a sleeve for mounting printing plates on flexographic printing machine cylinders. It refers to a sleeve formed from a transparent flexible polymer film or sheet substantially indeformable in its plane, such as polyester, and constituting the development of all or part of the cylinder on which the sleeve is applied by strips of adhesive tape. The patent describes the operability, use and advantages of this known sleeve.
The sleeve proposed in that patent is composed of a single material, i.e. a single layer, and presents a problem deriving from the thickness difference due to the application of the double-sided adhesive tape for fixing the sleeve to the printing cylinder. This problem is of considerable importance because it prejudices production of high quality printing work and also does not enable optimum printing of continuous work or total background work (where the edges of the photopolymer (plate) join together to obtain a continuous print over the entire cylinder surface).
Other currently available known solutions, mainly empirical, are hardly practical and are used for low profile or low quality work in that they present even more serious thickness difference problems and in particular do not enable efficient fixing to the cylinder, so totally prejudicing the entire print quality.
OBJECT OF THE INVENTION
The main object of the present invention is to improve the known sleeve by proposing both a method for producing an improved sleeve and the improved sleeve itself, by which better fixing to the printing cylinder is achieved.
Another object of the present invention is to provide a sleeve, of which that surface to be fixed to the cylinder is substantially uniform, so eliminating any printing problem while at the same time improving the print quality.
A further important object of the present invention is to provide a sleeve for all types of printing work (whether of low or very high quality) applicable to all types of commercially available printing machines, whether of central impression, stack or in-line with extruder type, using either traditional iron cylinders or rubber sleeves.
These and further objects which will be apparent from the ensuing detailed description are attained by the invention on the basis of the technical teachings expressed by the accompanying claims.
REFERENCES:
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patent: 3210187 (1965-10-01), Thommes
patent: 3358598 (1967-12-01), Middleton
patent: 4515375 (1985-05-01), Bleckmann et al.
patent: 4828641 (1989-05-01), Werther et al.
patent: 5715750 (1998-02-01), Goovaard
patent: 1 261 603 (1972-01-01), None
patent: 04284251 (1992-10-01), None
patent: 07251978 (1995-10-01), None
patent: 09179376 (1997-07-01), None
patent: 11158455 (1999-06-01), None
patent: 99/06212 (1999-02-01), None
Cielle Imballaggi di Tommaso Loreto S.r.l.
Hence Andrea
Hirshfeld Andrew H.
Young & Thompson
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