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US 6,149,985 AGranted
High-efficiency plasma treatment of imaging supports
AssigneeEastman Kodak Company
InventorsJeremy M. Grace, Louis J. Gerenser
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AssigneeEastman Kodak Company
InventorsJeremy M. Grace, Louis J. Gerenser
Estimating the term…
A method and apparatus are taught for treating polymer webs for obtaining the proper surface characteristics to promote adhesion of photosensitive coating materials and/or layers typically coated thereon. The web is passed through a high-voltage sheath region or dark space of the plasma generated by a powered electrode residing in a discharge zone. The frequency of the driving voltage must be above a lower bound dictated by the properties of the polymer support and the plasma, and it must be below an upper bound beyond which the sheath voltages drop significantly and it is observed that the benefits of this approach diminish. The dark space is generated by a treatment electrode in a treatment zone. There is a counter electrode having a surface area in said treatment zone which is at least as great as the surface area of the treatment electrode. A power supply is included for driving the treatment electrode with an oscillating high voltage at a frequency less than about 2 MHz and greater than 1/t.sub.c where t.sub.c is the charging time of a web surface exposed to a rms ion current in the plasma.
An apparatus for treating polymer web materials with a plasma, said apparatus comprising:
A method for treating polymer web materials with a plasma comprising the steps of:
An apparatus for treating polymer web materials with a plasma, said apparatus comprising:
Dependencies are inferred from the claim text.