GB2248314A - A photographic processing tank - Google Patents
A photographic processing tank Download PDFInfo
- Publication number
- GB2248314A GB2248314A GB9016731A GB9016731A GB2248314A GB 2248314 A GB2248314 A GB 2248314A GB 9016731 A GB9016731 A GB 9016731A GB 9016731 A GB9016731 A GB 9016731A GB 2248314 A GB2248314 A GB 2248314A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tank
- solution
- pipe
- stand
- processing
- 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
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000004480 active ingredient Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 17
- 239000011148 porous material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 33
- 239000004615 ingredient Substances 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- G03D3/065—Liquid supply; Liquid circulation outside tanks replenishment or recovery apparatus
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photographic Processing Devices Using Wet Methods (AREA)
Abstract
A processing tank in which exposed photographic material is treated with an aqueous processing solution and to which a replenishment solution is required to be added from time to time, comprises a stand-pipe (3) into which the replenishment solution which comprises active ingredients is fed via pipe (7) into the tank, the stand-pipe being fixed in the tank and having an open end (5) which is above the level of the solution in the tank and the side walls of the lower end of the stand-pipe which abuts the bottom of the tank comprising fiber (6). The replenishment solution is mixed with the processing solution by operating pump (11). <IMAGE>
Description
PROCESSING APPARATUS.
This invention relates to a processing tank in which material is treated with an aqueous processing solution. Often such aqueous solution requires to be replenished either due to carry-over on the material being processed or due to the active ingredients in the processing solution being used up during the processing.
We have now found a way of adding replenishment solutions to such a processing tank in which the replenishment solutions are mixed better with the solution in the tank.
Therefore, according to the present invention there is provided a processing tank in which material is treated with an aqueous processing solution and to which a replenishment solution is required to be added from time to time, and a stand-pipe into which the replenishment solution which comprises active ingredients is fed into the tank, the stand-pipe being fixed in the tank and having an open end which is above the level of the solution in the tank and the side walls of the lower end of the stand-pipe which abuts the bottom of the tank comprising pores.
Preferably the pores in the side walls at the lower end of the stand-pipe constitute a filter.
Preferably the tank is connected to a solution circulation pump so that liquid is drawn from the base of the tank and is returned to the tank.
Most preferably the liquid outlet of the circulation pump is located beneath the stand-pipe. Thus when the circulating pump is in operation, solution from the tank is sucked through the filter at the base of the stand-pipe and is recirculated in the tank. Any solid matter which may have been precipitated in the tank during the processing is thus prevented from being recirculated by the filter. Further the fresh replenishment solution which is fed into the stand-pipe will at once be circulated round the tank.
This prevents the build up of regions of high or low solution activity in the tank.
The replenishment solution may be concentrated solution which is added to the tank to maintain the activity of the solution or it may be a working-strength solution in those cases wherein the processing activity carried out in the tank not only causes the concentration of active ingredients in the tank to decrease but also removes by carry-over some of the solution in the tank, thus reducing continuously its volume.
The processing tank of the present invention is of particular use in the processing of exposed photographic materials which require a development step and a fixing step to provide a developed and fixed image on the material. In this case as each piece of photographic material is processed in the tank some of the active ingredients are used up and as each piece of photographic material is removed from the tank some of the liquid is taken out of the tank on the faces of the material. Thus the replenishment solution is required to replace both the active ingredients removed from the solution in the tank and to replace the volume of solution removed from the tank by the photographic material.When photographic material is being processed it is important that volumes of ingredient rich or ingredient poor solution are not present in the tank as uneven development or fixing could occur and both would detract from the appearance of the processed material.
The processing tank of the present invention prevents the build-up of ingredient rich or ingredient poor volumes in the bath of liquid in the tank by causing the replenishment liquid to be mixed at once with the bulk of liquid in the tank. In the prior art processing tanks usually the replenishment liquid is caused to fall on the surface of the liquid of the tank and this has led to pockets of ingredient rich solution in the tank.
Further often a surface is connected to the tank to prevent a build-up of liquid in the tank which occurs when more replenishment liquid is required to be fed to the tank to keep-up the ingredient strength than is taken out of the tank by the photographic material. When this occurs, if the replenishment liquid is allowed to fall on the surface of the liquid, then this replenishment liquid can at once flow out of the tank down the tank overflow.
Preferably there is associated with the processing tank a means to monitor the area of photographic material being processed and a means to deliver fresh replenishment solution to the tank based on the area which has been processed.
In another embodiment of the invention there is provided a photographic processing apparatus which includes a processing tank as just defined which contains developing solution and/or a processing tank as just defined which contains fixing solution.
The accompanying drawing will serve to illustrate the invention.
The drawing is a schematic plan view of a processing tank according to the present invention.
A processing tank 1 is filled with developing solution 2. Present in the tank 1 is a stand-pipe 3, the open end of which 5 is above the level of the level of the developing solution 2 in the tank. The lower end of the stand-piper 3 comprises a filter 6. Over the stand-pipe 3 is a replenishment liquid pipe 7 which comes from a replenishment supply vessel (not shown).
The end 9 of the pipe 7 is so located over the stand-pipe 3 that any liquid which issues therefrom will enter the stand-pipe 3.
Located at the bottom of the tank 1 is an exit port 10. This is connected to a circulation pump 11. This is connected by a pipe to an entry port 12.
In operation, photographic material is passed into the tank 1 where it remains for a predetermined time to develop the image. During this period the pump 11 is actuated which circulates the solution 2 round the tank.
When a predetermined area of photographic material has been developed in tank 1 a predetermined quantity of developer replenishment solution is caused to flow from the replenishment supply means down pipe 7, falling from end 9 into the stand-pipe 3. When the pump 11 operates, this fresh replenishment solution is caused to mix throughout the tank 1 and not to remain as a volume of enriched solution in the body of the developing solution 2.
Claims (6)
1. A processing tank in which material is treated with an aqueous
processing solution and to which a replenishment solution is required
to be added from time to time, and a stand-pipe into which the
replenishment solution which comprises active ingredients is fed into
the tank, the stand-pipe being fixed in the tank and having an open
end which is above the level of the solution in the tank and the side
walls of the lower end of the stand-pipe which abuts the bottom of the
tank comprising pores.
2. A processing tank according to Claim 1 wherein the pores in the side
walls at the lower end of the stand-pipe constitute a filter.
3. A processing tank according to either Claim 1 or Claim 2 wherein the
processing tank is connected to a solution circulation pump so that
the liquid is drawn from the base of the tank and is returned to the
tank.
4. A processing tank according to Claim 3 wherein the liquid out-let of
the circulation pump is located beneath the stand-pipe.
5. A processing tank according to any one of Claims 1 to 4 which is used
to process exposed photographic material and wherein the solution
contained in the tank is developing solution or fixing solution.
6. A processing tank according to Claim 1 wherein there is associated
with the processing tank a means to monitor the area of photographic
material being processed and a means to deliver fresh replenishment
solution to the tank based on the area which has been processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9016731A GB2248314B (en) | 1990-07-31 | 1990-07-31 | A photographic processing tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9016731A GB2248314B (en) | 1990-07-31 | 1990-07-31 | A photographic processing tank |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9016731D0 GB9016731D0 (en) | 1990-09-12 |
| GB2248314A true GB2248314A (en) | 1992-04-01 |
| GB2248314B GB2248314B (en) | 1994-03-16 |
Family
ID=10679904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9016731A Expired - Fee Related GB2248314B (en) | 1990-07-31 | 1990-07-31 | A photographic processing tank |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2248314B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB916611A (en) * | 1958-09-22 | 1963-01-23 | Agfa Ag | A method and apparatus for the separation of solid constituents of a partly used photographic processing liquid |
| GB1116842A (en) * | 1964-10-10 | 1968-06-12 | Agfa Gevaert Ag | Liquid circulation system more especially for a photographic processing tank |
| GB1288464A (en) * | 1969-08-11 | 1972-09-13 | ||
| GB1469006A (en) * | 1973-12-04 | 1977-03-30 | Egyt Gyogyszervegyeszeti Gyar | 2-phenylhydrazinothiazolines or-thiazines and a process for the preparation thereof |
| US4370046A (en) * | 1980-07-29 | 1983-01-25 | Agfa-Gevaert Aktiengesellschaft | Method and apparatus for processing exposed photographic material with bath constituent supply outlet openings at different levels |
-
1990
- 1990-07-31 GB GB9016731A patent/GB2248314B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB916611A (en) * | 1958-09-22 | 1963-01-23 | Agfa Ag | A method and apparatus for the separation of solid constituents of a partly used photographic processing liquid |
| GB1116842A (en) * | 1964-10-10 | 1968-06-12 | Agfa Gevaert Ag | Liquid circulation system more especially for a photographic processing tank |
| GB1288464A (en) * | 1969-08-11 | 1972-09-13 | ||
| GB1469006A (en) * | 1973-12-04 | 1977-03-30 | Egyt Gyogyszervegyeszeti Gyar | 2-phenylhydrazinothiazolines or-thiazines and a process for the preparation thereof |
| US4370046A (en) * | 1980-07-29 | 1983-01-25 | Agfa-Gevaert Aktiengesellschaft | Method and apparatus for processing exposed photographic material with bath constituent supply outlet openings at different levels |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2248314B (en) | 1994-03-16 |
| GB9016731D0 (en) | 1990-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960731 |