Method and system for processing film by speed and activating agent concentration temperature control
US5502532A · kind A · utility
Inventors
Key dates
| Filing date | May 23, 1994 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | May 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03D13/002
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A system and method for processing heat-developed or chemically-developed photographic film. The heat-developed film is transported through a pair of driven heated rollers that are of different durometer that eliminate the curl in the film. The driven heated rollers preheat the film and transport it into a hot air chamber where the film is further heated to development temperature in an expansion free environment. The temperature of the preheat rollers and the hot air chamber are maintained within a predetermined set point range and the speed with which the film travels from the preheat rollers through the hot air chamber is progressively decreased with increasing length of the film being processed through the system. A similar method and system for controlling chemical activating agents concentration and speed of the photographic film being developed therethrough is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.