Abstract:
A method of treating photographic effluent containing one or more metal ions with an oxidation number greater than one, comprising the addition of a water-soluble silicate to the effluent in an amount to render it glass-like and less permeable to water. Conveniently the effluent has been treated by the addition of calcium hydroxide and the silicate, preferably 'water-glass' may then be added either to the treated effluent suspension and the mixture separated or to the pre-separated solid.
Abstract:
Dispensing apparatus are well known for dispensing material from a package. Described herein is apparatus for dispensing predetermined amounts of material (10, 10') stored in vessels (12) carried by a continuous web (14). Each vessel (12) comprises a body portion (15) and a cap portion (16) with one end (22) of a pressure sensitive strip (24) positioned therebetween, the other end (26) of strip (24) being attached to the continuous web (14). The apparatus comprises a roller (28) over which the web (14) moves. Tightening of the strip (24) as the web (14) passes over the roller (28) causes the body portion (15) of the vessel (12) to become detached from the cap portion (16) and the material (10') is released.
Abstract:
When using unstable processing solutions, high recirculation and/or replenishment rates may be required. However, this may result in non-uniform processing of photographic material in processing apparatus using such solutions. Described herein is apparatus in which agitation members (17) are provided in the processing tank. The members (17) are fixed to a wall (11) of the tank at a location (18). The member (17) has a free end (25) which is positioned to lie against emulsion surface (26) of material (20) being processed (or against inner wall surface (19) if no material (20) is present). As material (20) is moved along path (13), agitation of the processing solution is achieved as some of the solution is carried along under the member (17) and the remainder passes through the member (17) itself.
Abstract:
A low volume thin tank photographic development apparatus has a narrow passage (2) which has a width which is adjustable by placing strips (11, 12), of chemically inert material at the edges of the passage. The strips (11, 12), may be wound on rollers (9, 10), and the strips may be stepped so that they are of different dimensions (13, 14), to accomodate different webs of photographic material being processed. The use of the strips ensures that the minimum quantity of photographic processing solution is used.
Abstract:
A method of processing an imagewise exposed photographic material in a processing solution which is unstable to the extent that it deteriorates without external reaction in which said photographic material is passed through a tank containing said solution characterised in that the solution is circulated through the tank at a rate of from 0.1 to 10 tank volumes per minute.
Abstract:
The critical time in photographic processing apparatus is the time from when the first part of photographic material enters the apparatus to when the last part leaves the apparatus. During this time there are periods of time in which no processing takes place, for example, as the material is passed from one stage to the next. Described herein is a processing unit which minimises the periods of time during which no processing is taking place. The unit comprises a processing tank (6) having processing solution (4) retained therein. Material (S) is fed into the tank (6) along a path (2), and around a looped path (8) until reaches a point (10) at which the material (S) can be deflected out of the tank (6), along path (14) and into a further processing tank (16), or can be deflected along path (12) so that further processing can take place in tank (6) prior to being passed on to the next stage.
Abstract:
It is known to use rotating drums in photographic processing apparatus. However, in many embodiments, relatively large volumes of processing solution are required for effective operation of the apparatus. This makes most drum arrangements unsuitable for use with unstable chemistry and single use chemistry as the processing solutions need to be replaced frequently. Described herein is photographic processing apparatus which incorporates a drum arrangement to form a low volume processing tank. The arrangement comprises a processing tank (10) in which a central rotatable drum (20) is mounted. A clearance of less than 5 mm is provided between the tank (10) and the drum (20) which defines a low volume for the processing solution (30).
Abstract:
It is known to use rotating drums in photographic processing apparatus. However, in many embodiments, relatively large volumes of processing solution are required for effective operation of the apparatus. This makes most drum arrangements unsuitable for use with unstable chemistry and single use chemistry as the processing solutions need to be replaced frequently. Described herein is an improvement to the surface (24) of a drum (20) in photographic processing apparatus incorporating a drum arrangement to form a low volume processing tank. The improvement comprises forming a spiral (22) either on or in the surface (24) of the drum (20). This has the advantage of improving the process activity of the apparatus and prevents the material being processed from adhering to the drum surface.
Abstract:
Dispensing apparatus are well known for dispensing material from a package. Described herein is apparatus for dispensing predetermined amounts of material (10, 10') stored in vessels (12) carried by a continuous web (14). The apparatus comprises a roller (18) over which the web (14) moves. A stop bar (20) is positioned above the roller (20) so that as the web (14) passes over the roller (18), the vessels (12) engage the bar (20) and are separated from the web (14) thereby releasing the material (10').
Abstract:
In small processing machines, the rate at which material passes through the machine tends to be low due to its size. This results in the access time being long as it is the sum of the actual processing time at each stage, plus the crossover times between each stage, and finally the time it takes for the whole sheet of material being processed to emerge from the machine. Described herein is apparatus which allows the transport rate between each stage and the exiting speed of the material from the apparatus to be increased. The apparatus comprises a rotating drum (10) around which a guide (12) is arranged to define a processing tank (14). Material to be processed is transported around the surface of the drum (10) in the processing tank (14) by transport roller set (26). The roller set (26) comprises a fixed roller (28) to which rollers (30, 32) are pivotally connected. Roller (32) is lifted from against the surface of the drum (10) to allow the material to be switched out of the tank (14). Similarly, roller (30) may be lifted to allow the material to enter the tank (14) and lie against the surface of the drum (10).