US4402888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharge treatment roll
Assignee: Pamarco Inc
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Filing: 1981-09-14
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Granted: 1983-09-06
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Expires: 2001-09-14
Abstract
Abstract The present invention relates to improvements in treatment rolls for the corona discharge treatment of polymeric films whereby the same are rendered receptive to printing inks and the like. More particularly, the invention is directed to a treatment roll and method for use as an electrode in a corona discharge device, the roll being comprised of a metal substrate having a porous ceramic coating, the interstices in said coating being filled with silicone polymer, the roll evincing a high resistance to wear and electrical breakdown, whereby higher volumes of material may be processed.
Inventors
- 👤 Walter A. Runck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:31
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/26; B41M1/30; B41M1/305; H; H01; H01T; H01T19/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
The process of rendering a polymeric film receptive to surface printing which comprises the steps of continuously advancing said polymeric film in the gap defined between a treater roll having a conductive metallic substrate and an electrode disposed in spaced parallel relation to said roll while maintaining between said substrate and said electrode an alternating current potential sufficient to create a corona discharge in said gap, characterized in that said roll includes a substantially even dielectric coating of a thickness in the range of from about 0.02" to about 0.05" or more comprised of porous refractory oxides having a density in the range of from about 85 to 95%, the pores within said oxide coating being substantially completely filled with polymeric material having high dielectric strength.
Claim 2
Dependent Claim
126 words
The process of rendering a polymeric film receptive to surface printing which comprises the steps of continuously advancing said polymeric film in the gap defined between a treater roll having a conductive metallic substrate and an electrode disposed in spaced parallel relation to said roll while maintaining between said substrate and said electrode an alternating current potential sufficient to create a corona discharge in said gap, characterized in that said roll includes a substantially even dielectric coating of a thickness in the range of from about 0.02" to about 0.05" or more comprised of porous refractory oxides having a density in the range of from about 85 to 95%, the pores within said oxide coating being substantially completely filled with polymeric material having high dielectric strength.
Claim 3
Dependent Claim
14 words
The process in accordance with claim 1 wherein said refractory oxide comprises aluminum oxide.
Claim 4
Dependent Claim
18 words
The process in accordance with claim 2 wherein said oxide coating is applied by a thermal spray operation.
Claim 5
Dependent Claim
32 words
The process in accordance with claim 3 wherein said oxide coating is effected using aluminum oxide powder cuts having average particle sizes in the range of from about 25 to 45 microns.
References Cited (Backward Citations)
US2881470A
Cited
US3639639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |