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
  • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
  • G03C5/04—Photo-taking processes

Definitions

• the invention relates to a method for visualizing residual moisture distributions in flowed photographic wet film layers by photochemical means by applying a swollen photographic film to the flowed area, passing a gas and then developing a residual moisture photogram with photographic developers.
• residual moisture distributions in the flowed photographic wet film layers can be made visible by photochemical means.
• the wet film diffusion process is based on the conversion of residual moisture profiles in flow-exposed films into moisture-analogous halftone blackening profiles.
• the development can be done by sulfide germination or by post-exposure.
• the photographic developer embedded in the film creates moisture-analogous silver halftone images at places of the residual moisture profile. Dry areas on the film remain bright (DE-PS 2 133 834).
• the post-exposure process and the sulfide seeding process are disturbed by exposure to daylight and must therefore be carried out under darkroom conditions.
• a reducing agent e.g. hydroquinone
• the object of the invention is a simplified development of residual moisture halftone photograms according to the wet film diffusion process.
• a film which is diffusely pre-exposed in daylight is placed in an aqueous swelling agent solution which contains (a) a reducing agent or (b) an alkali until the saturation of its gelatin layer, and in that the film after exposure to the air stream (a) immersed in an alcoholic alkali solution or (b) in an alcoholic solution of a reducing agent. Since the reducing agent or alkali is added to the swelling bath from the outset, there is no special treatment step.
• Water glycol mixtures with a content of 10 to 50 vol.% Glycol are preferably suitable as swelling agent solutions.
• the water-soluble developers can be used as reducing agents in the swelling agent solution.
• All water-soluble alkalis such as K 2 CO 3 , Na 2 CO 3 , trisodium phosphate, sodium metasilicate (Metso), trisodium phosphate, triethanolamine, trisodium phosphate, sodium metaborate, sodium pyrophosphate neutral, barium carbonate, codalk, borax and sodium sulfite, can be used as alkali in the swelling agent solution .
• special NaOH and KOH special NaOH and KOH.
• the concentrations are between 1 and 10% by weight.
• the pH of the solutions is between pH 9 and 13.
• Particularly suitable photographic developer solutions are alcohol / water mixtures with a content of up to 4% by volume of water.
• reducing agents in the developer solution are all developers which are readily soluble in alcohol, e.g. Pyrocatechol and p-phenylenediamine, especially hydroquinone.
• concentrations of the solutions are between 1 and 5% by weight, the working temperatures between 15 and 30 ° C.
• Suitable alkali in the developer solution are the alcohol-soluble alkalis such as Na 2 CO 3 and triethanolamine and in particular NaOH and KOH as well as the lower alcoholates of potassium and sodium, such as sodium and potassium methylate and ethylate.
• the concessions trations of the solutions are between 1 and 5% by weight at working temperatures between 15 and 30 ° C.
• the immersion times of the exposed films in the developer solutions are between 10 and 300 seconds.
• a film which is diffusely pre-exposed in daylight is saturated to approx. 3 to max. Swollen in an aqueous swelling agent solution containing a reducing agent or an alkali for 20 minutes.
• the swelling agent residues still present on the film surface when the film is removed from the solution are removed by stripping or squeezing using a calender.
• the film provided with the invisible residual moisture profile is immersed in the one-bath developer solution which, depending on the swelling agent composition, contains only one alkali or one reducing agent.
• a visible black and white silver halftone is created.
• the film is removed by squeezing off developer liquid residues in order to avoid staining on the film during the subsequent fixing. After fixing, the film is washed and dried as usual.
• the method according to the invention is particularly suitable for determining stationary, local boundary layer thickness distributions, wall shear stresses, mass transfer coefficients and heat transfer coefficients.
• a photographic sheet film (Agfa N33 p) is swollen in daylight in a swelling agent solution at a temperature of 20 ° C for 5 minutes.
• the swelling agent solution consists of a water / glycol mixture in a ratio of 1: 1 and an addition of 2% by weight of hydroquinone. After swelling, excess liquid residues on the film are removed by squeezing using a calender. The swollen film is then applied to the surface to be streamed and exposed in the air stream. After an exposure time of several minutes, the film provided with the invisible residual moisture profile is removed from the surface of the article under flow and immersed in the one-bath developer solution.
• the developer solution consists of an alcohol / water mixture with a content of 4 vol.% Water and an addition of 2 wt.% NaOH.
• the development time is 3 minutes at a temperature of 20 ° C.
• a visible, black and white silver halftone is created.
• excess liquid residues on the film are removed by squeezing using a calender. The film is then fixed, watered and dried.
• a photographic sheet film (Agfa N33p) is swollen in daylight in a swelling agent solution at a temperature of 20 ° C for 5 minutes.
• the swelling agent solution consists of a water / glycol mixture in a ratio of 1: 1 and an addition of 5% by weight of KOH. After swelling, excess liquid residues on the film are removed by squeezing. The swollen film is then applied to the surface to be sprayed and exposed in the air stream. After an exposure period The film provided with the invisible residual moisture profile is removed from the surface of the flowed object for several minutes and immersed in the one-bath developer solution.
• the developer solution consists of anhydrous alcohol with the addition of 2% by weight of hydroquinone.
• the development time is 5 minutes at a temperature of 20 ° C.
• a visible, black and white silver halftone is created.
• excess liquid residues on the film are removed by squeezing using a calender. The film is then fixed, watered and dried.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6096236

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (2)

Family Cites Families (5)

• 1980
  • 1980-03-04 DE DE19803008266 patent/DE3008266A1/de not_active Withdrawn
• 1981
  • 1981-02-18 US US06/235,672 patent/US4350757A/en not_active Expired - Fee Related
  • 1981-02-23 DE DE8181101297T patent/DE3167535D1/de not_active Expired
  • 1981-02-23 EP EP81101297A patent/EP0035206B1/fr not_active Expired
  • 1981-02-23 AT AT81101297T patent/ATE10685T1/de not_active IP Right Cessation
  • 1981-03-03 CA CA000372183A patent/CA1168497A/fr not_active Expired
  • 1981-03-04 JP JP3109081A patent/JPS56149037A/ja active Pending

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