Printing – Printing members – Rolling contact
Patent
1991-04-30
1992-07-21
Burr, Edgar S.
Printing
Printing members
Rolling contact
29127, 138129, 138130, 138150, 138154, B41F 1310
Patent
active
051313251
ABSTRACT:
A reusable printing sleeve for supporting flexible printing plates, the sleeve having a limited circumferential resilience, whereby when subjected to air jets emitted from the apertures in the wall of a printing cylinder, the sleeve is dilated to facilitate the application of the sleeve to the cylinder or its removal therefrom. The sleeve is constituted by four or five interlaminated layers. The innermost one or two layers are comprised of wide strips of plastic film helically wound about a cylindrical shape. The outer three layers of the sleeve are constituted of three interlaminated layers each formed by helically wound of synthetic plastic tape. All three outer layers are wound at helix angles substantially different from the innermost layer or layers. Two of the outermost layers of the sleeve are wound at the same helix angle but are phase displaced relative to each other, whereby the air gap between the convolutions of one layer is bridged by the convolutions of the other, thereby sealing the gap and rendering the sleeve impermeable to air. The remaining layer is wound at an angle opposed to the helix angle of the other two, thereby strengthening and rigidifying the structure of the sleeve.
REFERENCES:
patent: 444233 (1891-01-01), Denney
patent: 477593 (1892-06-01), Greenfield
patent: 2536243 (1951-01-01), Walker
patent: 3146709 (1964-09-01), Bass
patent: 3978254 (1971-08-01), Hoexter
patent: 4089265 (1978-05-01), White
patent: 4903597 (1990-02-01), Hoage et al.
Burr Edgar S.
Flexographic Technology, Inc.
Funk Stephen R.
Obrecht, Jr. Charles F.
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