Claims
- 1. A method for eliminating static-induced splattering of negatively charged ink in the printing of plastic films, said method comprising the steps of:
- (a) providing a roller for frictionally engaging the film being printed, said roller being coated with a surface layer of a suitably durable polymeric substance which is more triboelectrically positive than the plastic film being printed, said surface layer of said polymeric substance being of a thickness which is at least about 0.035 pounds per 3,000 square feet;
- (b) frictionally engaging said film and said coated roller to impart a negative static electric charge to said film; and
- (c) thereafter printing said negatively charged film with said negatively charged ink.
- 2. The method of claim 1 wherein said coated roller is a rubber impression cylinder.
- 3. The method of claim 1 wherein said polymeric substance layer has a thickness in the range of about 0.035 pounds per 3,000 square feet to about 10.0 pounds per 3,000 square feet.
- 4. The method of claim 1 wherein said polymeric substance layer has a thickness of about 2.5 pounds per 3,000 square feet.
- 5. The method of claim 1 wherein said polymeric substance is a cross-linked polyethylene imine.
- 6. The method of claim 5 wherein said plastic film is polyethylene terephthalate.
Parent Case Info
This application is a continuation-in-part of copending application Ser. No. 506,851 filed June 24, 1983, now abandoned, which is a continuation of application Ser. No. 352,112 filed Sept. 25, 1982 and now abandoned, which is a continuation of application Ser. No. 185,174 filed Sept. 8, 1980 now abandoned, which is a continuation-in-part of application Ser. No. 927,174 filed on July 21, 1978 and now abandoned.
US Referenced Citations (4)
Non-Patent Literature Citations (1)
Entry |
Reference Encyclopedia of Flexographic Equipment and Supplies, Robert P. Lung, North American Publ. Co., Philadelphia, Penn., 1974, pp. 101-103. |
Continuations (2)
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Number |
Date |
Country |
Parent |
352112 |
Sep 1982 |
|
Parent |
185174 |
Sep 1980 |
|
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
506851 |
Jun 1983 |
|
Parent |
927174 |
Jul 1978 |
|