Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
  • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
  • G03D3/02—Details of liquid circulation
  • G03D3/06—Liquid supply; Liquid circulation outside tanks
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
  • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
  • G03D3/02—Details of liquid circulation

Definitions

• Photographic processing methods are usually carried out continuously.
• the photographic processing baths for example developing baths, bleach baths, fixing baths, stop baths, stabilizing baths or bleach-fixing baths, are continuously regenerated in accordance with the amount of photographic material to be processed, so that the desired concentration of processing chemicals is always maintained. Since chemicals are released from the material or from the processing bath in most photographic processing steps, which can be disruptive when enriched, the regeneration solution is added in an amount which is greater than that which the material is already transporting out of the bath that an overflow occurs. This overflow is collected for economic and ecological reasons, cleaned, chemically processed and fed back into the system.
• the object of the invention was to prevent these losses as quantitatively as possible and thus to enable almost complete recycling of photographic processing baths.
• the object of the invention is now achieved without the disadvantages of the prior art discussed above that the photographic material leads from the bottom to the top and from after the treatment bath through a rising chamber which closely encloses the photographic material acted upon above with water, which counteracts gravity in accordance with the course of the photographic material.
• the chamber ideally a tube which is adapted to the geometry of the photographic material in cross-section and which is preferably arranged vertically, can be immersed in the treatment liquid or preferably end just above it.
• the rising chamber preferably always has the same cross section over its length; Their length is to be adapted to the transport speed of the material so that there is a dwell time within the chamber of 6 to 60 s. At a speed of 1 m / min the chamber should have a length between 10 and 100 cm.
• the chamber can be staggered and located next to the tank containing the processing chemicals, whereby the water used is brought back to the required level by pumping .
• the side walls of the chamber that come closest to the edges of the material web can be dispensed with. This makes fanning out particularly easy. By occupying the two remaining walls e.g. with a foam there is no danger that the applied water will emerge laterally from the now open chamber, since it is kept inside the chamber by the surface tension or the capillary forces.
• the water now loaded with chemicals passes from the chamber into the chemical tank above which it is arranged.
• the resulting dilution of the chemical bath is compensated for by adding the chemicals required to regenerate the bath in the most concentrated form possible as a liquid concentrate or even as a solid.
• the dilution can be compensated for by permanently adding the chemical bath itself to a concentration unit, e.g. an evaporator unit, reverse osmosis or ultrafiltration is connected through which part of the chemical bath is constantly led.
• the inside of the washing chamber is advantageously lined with a material that does not damage the surface of the photographic material, for example with foam, polyamide plush, polyamide mesh, polypropylene plush, polypropylene cloth, stainless steel mesh or finely perforated stainless steel sheet.
• the lined surface preferably faces the emulsion layer side of the material.
• the space between these lining materials and the chamber wall can be filled with capillary-active substances such as cellulose fibers or silica gel.
• the process according to the invention works with excellent efficiency if 10 to 400 ml of water, preferably 50 to 200 ml of water and in particular 75 to 150 ml of water, are moistened per m2 of photographic material with an emulsion layer of 10 ⁇ m.
• the value changes accordingly for photographic materials with different layer thicknesses.
• a concentration of 8.2 g NH4-Fe-EDTA / l was determined analytically.
• Example 2 The procedure was as in Example 1, but with the difference that the 8.9 cm wide photo material after passing through the bleaching bath tank and the rubber lips through a 60 cm long tube with a clear width of 3 mm, and a width of 10 cm, that was lined with a polypropylene fabric, was guided at a speed of 1 m / min.
• the tube was placed vertically above the bleaching bath and did not dip into the bleaching bath.
• the distance to the bleaching bath was 5 cm.
• An amount of 70 ml of water was added to the upper end of the tube per m2 of colored paper. After this passage, the paper again passed through the 8-liter washing tank, which was not supplemented with fresh water. After processing 10 m2 of paper, the concentration of NH4-Fe-EDTA was again determined analytically in this washing: 410 mg / l.
• the method according to the invention is thus 20 times more effective than the conventional scraper.
• Example 2 The procedure is as in Example 2, but with the difference that the 8.9 cm wide photo material is carried out between two parallel plates of 60 cm long and 10 cm wide.
• the plates are each lined with 1.5 mm thick foam on the side facing the photographic material.
• the material lies on both plates or on the foam.
• the efficiency of the chamber was determined via the concentration of NH4Fe EDTA in the subsequent washing: 470 mg / l.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Photographic Processing Devices Using Wet Methods (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6425857

Family Applications (1)

Country Status (4)

Families Citing this family (5)

Family Cites Families (5)

• 1991
  • 1991-02-26 DE DE4105917A patent/DE4105917A1/de not_active Withdrawn
• 1992
  • 1992-02-11 US US07/833,995 patent/US5365300A/en not_active Expired - Fee Related
  • 1992-02-13 EP EP92102369A patent/EP0501232B1/fr not_active Expired - Lifetime
  • 1992-02-13 DE DE59206881T patent/DE59206881D1/de not_active Expired - Fee Related
  • 1992-02-20 JP JP4069295A patent/JPH0588331A/ja active Pending

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