EP0837364A1 - Procédé de traitement et récupération de matériaux provenant de la production et le développement de films photographiques et radiographiques - Google Patents
Procédé de traitement et récupération de matériaux provenant de la production et le développement de films photographiques et radiographiques Download PDFInfo
- Publication number
- EP0837364A1 EP0837364A1 EP97830513A EP97830513A EP0837364A1 EP 0837364 A1 EP0837364 A1 EP 0837364A1 EP 97830513 A EP97830513 A EP 97830513A EP 97830513 A EP97830513 A EP 97830513A EP 0837364 A1 EP0837364 A1 EP 0837364A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- approx
- stage
- silver
- gelatin
- recovery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C11/00—Auxiliary processes in photography
- G03C11/24—Removing emulsion from waste photographic material; Recovery of photosensitive or other substances
Definitions
- the present invention relates to a process for the treatment and recovery of materials from the production and development of photographic and x-ray films.
- it relates to a process for the recovery, by means of chemical/physical treatments, of the materials of which photographic films and x-ray plates are made, more precisely the recovery of silver, polyester, which forms the base of the photo-x-ray film, and the animal gelatin which coats one or both surfaces of the aforementioned polyester base.
- the present invention therefore belongs to the sector of industrial chemical processes designed to recover materials which, when recycled, are suitable for further use.
- polyester and gelatin are currently discarded, this being an undoubted disadvantage from the economic (and environmental) viewpoint, considered that recycled polyester and gelatin have excellent possibilities for re-use.
- the silver may be recovered using dry or wet systems.
- the dry system envisages that the starting material, i.e.: photosensitive plates or films, be subjected to combustion.
- the silver evaporates or remains as an unburned base body, which may then be gathered.
- the polyester and gelatin are lost.
- the wet system envisages the use of developing and fixing baths.
- the fixing bath is used to extract the "superfluous" silver from the fixed silver.
- the object of the present invention is, therefore, to recover all of the material, that is to say, the silver, polyester and animal gelatin.
- a further object is to effect the said recovery in a relatively simple, low cost manner.
- the material to be treated consists of a base which is a polyester film, coated on one or both surfaces with a gelatin of animal origin, in which metallic silver or silver salt is dispersed.
- the material normally arrives in bales of waste or sheets, not yet exposed, or in the form of x-ray plates in envelopes.
- the first step which is manual, consists in undoing the bales and separating the plates from the paper.
- the film is then shredded in a special machine and reduced to pieces whose size is 0.3 - 3 cm 2 . It is essential that the material be shredded, in order to allow the completion of the chemical reactions which must take place on both surfaces of the film. Larger dimensions would promote adhesion of the surfaces, preventing completion of the reactions and reducing the overall efficiency of the process. In particular, recovery of the silver would be compromised.
- the material containing metallic silver is then subjected to a "bleaching" action, that is to say, oxidation of the metallic silver to ionic silver.
- This action occurs in an aqueous bath, kept at ambient temperature (10 - 25 °C), containing: copper sulphate (to oxidise the silver); hydrogen peroxide (to re-oxidise the copper); sodium chloride (to provide a counter-ion to the silver ion).
- the reaction occurs at pH 0.5 - 3. Lower pH values could cause the gelatin to be detached; whilst higher pH values would make the bleaching action less effective.
- the treatment time varies from 3 to 15 minutes: lower times would be insufficient to complete the reaction; higher times could cause the gelatin to be detached.
- copper as an oxidising agent is determined by process economy and final quality of the polyester recovered: other oxidising agents would be more difficult to remove and would, as a result, pollute the final product.
- concentrations of the reagents copper sulphate 5 - 12 %; sodium chloride 5 - 15 %; hydrogen peroxide 0.1 - 1 %.
- the material containing bleached silver that is to say, silver salt
- a fixing bath containing sodium thiosulphate containing sodium thiosulphate.
- the silver salt contained in the gelatin, and insoluble in water is solubilized by the presence of the thiosulphate.
- the treatment time is 3 - 15 minutes at a temperature of 10 - 25 °C; the concentration of the sodium thiosulphate may vary from 50 to 200 g/l.
- the fixing solution, enriched with silver, is then sent to the electrolytic recuperator; once the silver has been deposited, the bath is put into circulation again.
- the material - now consisting of polyester coated with gelatin - is sent to the gelatin removal tank, which consists of a bath containing sodium hydrate 5 - 25 % and is kept at 55 - 80 °C.
- the gelatin solubilizing process occurs within 5 - 20 minutes.
- the polyester is then sent to the washing, rinsing and centrifugation plant.
- product washing stages may be envisaged upstream of those operating stages which require unpolluted products from the operating stage upstream.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Photographic Processing Devices Using Wet Methods (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Electrolytic Production Of Metals (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO960515 | 1996-10-15 | ||
IT96BO000515A IT1286260B1 (it) | 1996-10-15 | 1996-10-15 | Processo per il trattamento ed il recupero di materiali provenienti dalla produzione e sviluppo di film fotografici e radiografici |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0837364A1 true EP0837364A1 (fr) | 1998-04-22 |
EP0837364B1 EP0837364B1 (fr) | 2001-08-16 |
Family
ID=11341648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97830513A Expired - Lifetime EP0837364B1 (fr) | 1996-10-15 | 1997-10-10 | Procédé de traitement et récupération de matériaux provenant de la production et le développement de films photographiques et radiographiques |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0837364B1 (fr) |
AT (1) | ATE204387T1 (fr) |
DE (1) | DE69706115T2 (fr) |
IT (1) | IT1286260B1 (fr) |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3047435A (en) * | 1958-11-10 | 1962-07-31 | Eastman Kodak Co | Recovery of polyester film base from terpolymer-subbed photographic film scrap |
US3647422A (en) * | 1970-07-13 | 1972-03-07 | Horizons Research Inc | Recovery of silver, polyester and amino acids from processed film |
US3793168A (en) * | 1971-01-18 | 1974-02-19 | R Lilly | Method of recovering silver |
US3928253A (en) * | 1972-05-10 | 1975-12-23 | Horizons Inc | Process for recovery of clean polyester materials |
GB1432000A (en) * | 1973-11-09 | 1976-04-14 | Horizons Research Inc | Recovery of materials from photographic film |
SU611168A1 (ru) * | 1976-05-31 | 1978-05-15 | Государственный научно-исследовательский и проектно-конструкторский институт гидрометаллургии цветных металлов | Способ переработки желатиновых галогенсеребр ных фотографических эмульсий |
JPS541026A (en) * | 1977-06-04 | 1979-01-06 | Konishiroku Photo Ind Co Ltd | Processing method for silver halide color photographic material |
US4299676A (en) * | 1980-01-31 | 1981-11-10 | Photographic Silver Recovery Limited | Recovery of silver from photographic film |
EP0239805A1 (fr) * | 1986-03-04 | 1987-10-07 | Fixersave Limited | Traitement des bains de développement photographique |
JPS62237447A (ja) * | 1986-04-08 | 1987-10-17 | Mitsubishi Paper Mills Ltd | 一液型エツチングブリ−チ液 |
US4799954A (en) * | 1987-02-13 | 1989-01-24 | E. I. Du Pont De Nemours And Company | Recovery of silver from photographic film with high shear and caustic |
SU1681295A1 (ru) * | 1989-02-22 | 1991-09-30 | Казанский научно-исследовательский технологический и проектный институт химико-фотографической промышленности Производственного объединения "Тасма" | Способ удалени эмульсионного и адгезионного желатиновых слоев с полиэтилентерефталатной подложки фотоматериалов |
US5418115A (en) * | 1993-03-24 | 1995-05-23 | Mitsubishi Paper Mills Limited | Method for formation of image |
-
1996
- 1996-10-15 IT IT96BO000515A patent/IT1286260B1/it active IP Right Grant
-
1997
- 1997-10-10 DE DE69706115T patent/DE69706115T2/de not_active Expired - Fee Related
- 1997-10-10 EP EP97830513A patent/EP0837364B1/fr not_active Expired - Lifetime
- 1997-10-10 AT AT97830513T patent/ATE204387T1/de active
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3047435A (en) * | 1958-11-10 | 1962-07-31 | Eastman Kodak Co | Recovery of polyester film base from terpolymer-subbed photographic film scrap |
US3647422A (en) * | 1970-07-13 | 1972-03-07 | Horizons Research Inc | Recovery of silver, polyester and amino acids from processed film |
US3793168A (en) * | 1971-01-18 | 1974-02-19 | R Lilly | Method of recovering silver |
US3928253A (en) * | 1972-05-10 | 1975-12-23 | Horizons Inc | Process for recovery of clean polyester materials |
GB1432000A (en) * | 1973-11-09 | 1976-04-14 | Horizons Research Inc | Recovery of materials from photographic film |
SU611168A1 (ru) * | 1976-05-31 | 1978-05-15 | Государственный научно-исследовательский и проектно-конструкторский институт гидрометаллургии цветных металлов | Способ переработки желатиновых галогенсеребр ных фотографических эмульсий |
JPS541026A (en) * | 1977-06-04 | 1979-01-06 | Konishiroku Photo Ind Co Ltd | Processing method for silver halide color photographic material |
US4299676A (en) * | 1980-01-31 | 1981-11-10 | Photographic Silver Recovery Limited | Recovery of silver from photographic film |
EP0239805A1 (fr) * | 1986-03-04 | 1987-10-07 | Fixersave Limited | Traitement des bains de développement photographique |
JPS62237447A (ja) * | 1986-04-08 | 1987-10-17 | Mitsubishi Paper Mills Ltd | 一液型エツチングブリ−チ液 |
US4799954A (en) * | 1987-02-13 | 1989-01-24 | E. I. Du Pont De Nemours And Company | Recovery of silver from photographic film with high shear and caustic |
SU1681295A1 (ru) * | 1989-02-22 | 1991-09-30 | Казанский научно-исследовательский технологический и проектный институт химико-фотографической промышленности Производственного объединения "Тасма" | Способ удалени эмульсионного и адгезионного желатиновых слоев с полиэтилентерефталатной подложки фотоматериалов |
US5418115A (en) * | 1993-03-24 | 1995-05-23 | Mitsubishi Paper Mills Limited | Method for formation of image |
Non-Patent Citations (5)
Title |
---|
COOLEY A C: "SILVER RECOVERY FOR ENVIRONMENTAL COMPLIANCE IN PHOTOGRAPHIC PROCESSING", JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY, vol. 37, no. 4, 1 July 1993 (1993-07-01), pages 374 - 379, XP000423013 * |
DATABASE WPI Section Ch Week 7907, Derwent World Patents Index; Class E37, AN 79-12657B, XP002052387 * |
DATABASE WPI Section Ch Week 7917, Derwent World Patents Index; Class G06, AN 79-33088B, XP002052389 * |
DATABASE WPI Section Ch Week 8747, Derwent World Patents Index; Class M14, AN 87-331438, XP002052388 * |
DATABASE WPI Section Ch Week 9228, Derwent World Patents Index; Class A23, AN 92-232294, XP002052390 * |
Also Published As
Publication number | Publication date |
---|---|
ATE204387T1 (de) | 2001-09-15 |
ITBO960515A0 (it) | 1996-10-15 |
IT1286260B1 (it) | 1998-07-08 |
EP0837364B1 (fr) | 2001-08-16 |
ITBO960515A1 (it) | 1998-04-15 |
DE69706115D1 (de) | 2001-09-20 |
DE69706115T2 (de) | 2002-04-25 |
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