Method of applying single polar electro-static charges to continuously travelling long web support, and apparatus practicing same
AssigneeFuji Photo Film Co., Ltd.
InventorsKenji Nakajima, Atsuo Futami
Life of this patent
Estimating the term…
Abstract
A charging apparatus for applying single polar electrostatic charges to a surface of a continuously travelling long web support before coating the support with a coating composition comprises a fine wire shaped corona discharging electrode connected to a electric source and a pass roller coated by a coating, the pass roller facing said corona discharging through the support.
Claims16
A charging method for applying single polar electrostatic charges onto a first surface of a continuously travelling long web support before coating said support with a coating composition said support having a coating portion and a roulette mark portion on each side of said coating portion, said method comprising the steps of:
- placing a corona discharging electrode adjacent to said first surface of said support, said corona discharging electrode being connected to a direct-current high-voltage electric source and applying single polar electrostatic charge onto said first surface of said support, said corona discharging electrode being wider than said support by a predetermined distance;
- placing a pass roller having a surface that is coated with ceramic adjacent to a second surface of said support such that said pass roller faces said electrode with said support disposed therebetween, said ceramic surface coating having a thickness in the range of greater than or equal to 0.3 mm and less than 0.5 mm;
- causing said support to continuously travel between said corona discharging electrode and said pass roller;
- applying said single polar electrostatic charges on said surface of said continuously travelling long web support by said corona discharging electrode;
- and
- coating said coating portions of said support with said coating composition.
A charging apparatus comprising:
- a fine wire shaped corona discharging electrode connected to a direct-current high-voltage electric source;
- and
- a pass roller having a surface coating made of ceramic having a thickness in the range of greater than or equal to 0.3 mm and less than 0.5 mm, said pass roller facing said corona discharging electrode through a long web support that continuously travels therebetween, wherein said corona discharging electrode has a width that is wider than a width of said support by a predetermined distance and applies single polar electrostatic charges onto a surface of said continuously travelling long web support before coating said support with a coating composition.
Dependencies are inferred from the claim text.