Advancing material of indeterminate length – By intermittent material-mover – Comprising material-moving roll
Patent
1988-01-29
1989-08-01
Mathews, A. A.
Advancing material of indeterminate length
By intermittent material-mover
Comprising material-moving roll
354322, 226189, G03D 313
Patent
active
048537284
ABSTRACT:
A method of achieving an optimal balance of wrap angle, strike angle, and film driving force parameters in a roller transport film processor, and a film processor so constructed, are disclosed. Purposes are to optimize performance and to eliminate or attenuate pi line artifacts on processed film. The method includes the following steps: (a) determining empirically a relationship of strike angle as a function of wrap angle; (b) determining empirically a relationship of film driving force as a function of wrap angle; (c) preselecting a maximum allowable strike angle; (d) from the relationship of strike angle to wrap angle, determining a maximum allowable wrap angle corresponding to the maximum allowable strike angle; (e) preselecting a minimum practical wrap angle corresponding to a minimum practical film driving force; and (f) establishing horizontal centerline distances between rollers in the film processor to achieve a wrap angle between the maximum allowable wrap angle and the minimum practical wrap angle. By this method, functional ranges of wrap angle, strike angle, and film driving force parameters are defined. Within these ranges, a roller transport film processor is operable without resulting pi line artifacts.
REFERENCES:
patent: 3072310 (1963-01-01), Kunz
patent: 4002280 (1977-01-01), Coleman et al.
patent: 4034389 (1977-07-01), Huss
patent: 4118998 (1978-10-01), Hope et al.
patent: 4307831 (1981-12-01), Hope et al.
Eastman Kodak Company
Fields Roger A.
Mathews A. A.
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