US4030415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexographic printing roll having fluid pressure grooving for dismounting
Assignee: MA Buckley Engraving Ltd
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Filing: 1975-09-22
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Granted: 1977-06-21
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Expires: 1995-09-22
Abstract
Abstract A flexographic printing roll is formed by the technique of applying a circumferentially stretchable, elastomeric, engraved, seamless sleeve to a rigid base tube, the sleeve being expanded by air pressure as it is applied to the tube. The base tube has perforations in the form of small apertures and shallow external grooving extending away circumferentially from said apertures.
Inventors
- 👤 Stanley Fellows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:03
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/18; B41C1/182; B41F; B41F13/00; B41F13/08; B41F13/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A flexographic printing roll comprising a rigid base tube having perforations in the form of a plurality of small apertures and shallow external grooving extending circumferentially away from said apertures so that fluid pressure appearing at the apertures is distributed circumferentially by said grooving, and a circumferentially stretchable, elastomeric, engraved, seamless printing sleeve on said tube strained to grip the tube to retain the sleeve securely on the tube, said printing sleeve covering said shallow external grooving such that increasing fluid pressure in said grooving relative to fluid pressure on the exterior of said sleeve would cause said printing sleeve to expand and be readily removable from said tube.
Claim 2
Dependent Claim
109 words
A flexographic printing roll comprising a rigid base tube having perforations in the form of a plurality of small apertures and shallow external grooving extending circumferentially away from said apertures so that fluid pressure appearing at the apertures is distributed circumferentially by said grooving, and a circumferentially stretchable, elastomeric, engraved, seamless printing sleeve on said tube strained to grip the tube to retain the sleeve securely on the tube, said printing sleeve covering said shallow external grooving such that increasing fluid pressure in said grooving relative to fluid pressure on the exterior of said sleeve would cause said printing sleeve to expand and be readily removable from said tube.
Claim 3
Dependent Claim
17 words
A printing roll as claimed in claim 1 in which the edges of the grooving are curved.
Claim 4
Dependent Claim
35 words
A flexographic printing roll as claimed in claim 1 in which the sleeve comprises a rubber core tube providing the principal stiffness to the sleeve and an outer elastomeric tube bonded to the core tube.
Claim 5
Dependent Claim
63 words
A method of assembling a flexographic printing roll as claimed in claim 1 comprising sliding said sleeve axially over said base tube while internally pressurizing the interior of the base tube such that the pressure is distributed through said apertures and circumferentially through said grooving to expand said sleeve, and releasing said pressure so as to cause the sleeve to grip the tube.
References Cited (Backward Citations)
CA701383A
Cited
US2060082A
Cited
US2315729A
Cited
US2518834A
Cited
US2721601A
Cited
DE1038567B
Cited
US3069821A
Cited
US3378902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |