Printing – Embossing or penetrating – Special-article machines
Patent
1984-08-24
1985-04-30
Fisher, J. Reed
Printing
Embossing or penetrating
Special-article machines
101219, 101426, 29132, B41F 1318
Patent
active
045136602
ABSTRACT:
An impression roller for electrostatically assisted printing distributes a charge across a web of packaging material. The roller has considerably more resistance in the longitudinal direction than in the circumferential direction to restrict the distribution of charge to portions of the roller extending beyond the web. The lower resistance in the circumferential direction is provided by a set of looped conductors--either conductive rubberized strips or wire loops--which are embedded in an outer layer of semiconductive material of the roller to allow electrical current traveling in the circumferential direction to bypass portions of the semiconductive material. The electrical current encounters considerably more resistance in the longitudinal direction, because the conductors are spaced longitudinally along the rollers at intervals and any current traveling from one looped conductor to another travels through the semiconductive material.
REFERENCES:
patent: 2520504 (1950-08-01), Hooper
patent: 3477369 (1969-11-01), Adamson et al.
patent: 3625146 (1971-12-01), Hutchison
patent: 4099462 (1978-07-01), Coberley et al.
patent: 4364313 (1982-12-01), Hyllberg
Brands George B.
Hyllberg Bruce E.
American Roller Company
Fisher J. Reed
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