Apparatus for diluting and mixing chemicals and automatically feeding the diluted chemicals to a photographic processor on demand

Apparatus for (1) metering an amount of at least three concentrated liquid chemical solutions, (2) metering an amount of water, (3) feeding the metered amounts of concentrated chemical solutions and water to a static, inline mixing means and (4) delivering a properly diluted working solution from the mixing member to a processing machine on demand from the processing machine, said apparatus comprising in combination;

• at least three storage containers, with a separate, distinct storage container being provided for each of the concentrated liquid chemical solutions;
• at least three metering devices, with a separate, distinct metering device being connected to each storage container for metering a controlled amount of concentrated liquid chemical solution from the storage container;
• mixing means comprising first and second static mixing devices, wherein each static mixing device has an inlet and an outlet and the static mixing devices are connected in series such that the inlet of the second static mixing device is connected to the outlet of the first static mixing device, with each static mixing device being of the type that effects mixing of liquids introduced into the static mixing device by turbulent flow of the liquids through the static mixing device;
• a water metering device connected to a source of water under pressure for metering a controlled amount of water from the source of water under pressure;
• means for connecting the water metering device to the inlet of the first static mixing device;
• means for connecting the inlet of the first static mixing device to the metering device that is connected to a first storage container;
• means for connecting the inlet end of the second static mixing device to each of the metering devices connected to the remaining storage containers;
• means for connecting the outlet of the second static mixing device to the processing machine;
• and
• a control unit that controls the operation of the metering devices and water metering device to deliver the proper amount of mixed, diluted working solution from said second static mixing device to the processing machine,
• whereby as the metered amount of water flows through the first static mixing device, a concentrated liquid chemical solution from said first storage container is mixed therewith, and as the metered amount of water flows through the second static mixing device, concentrated liquid chemical solutions from the remaining storage containers are mixed therewith, and the solution coming from the outlet of the second static mixing device is delivered from said second static mixing device to the processing machine.

A method of preparing a diluted working solution from at least two concentrated liquid chemical solutions and delivering the diluted working solution to a processing machine, said method comprising

• providing separate, distinct storage containers, at least one storage container for each of the concentrated liquid chemical solutions;
• upon demand from the processing machine for working solution, a metered amount of water is introduced into a static, inline mixing means that comprises a number of static mixing devices equal to the number of concentrated liquid chemical solutions, with each static mixing device having an inlet and an outlet and with the static mixing devices being connected in series such that the inlets of the second and subsequent static mixing devices are connected to a respective outlet of an upstream static mixing device, and further with the metered amount of water being introduced into an inlet of a first static mixing device in the series of static mixing devices so that the metered amount of water flows initially through the first static mixing device and then serially through subsequent static mixing devices in the series of static mixing devices;
• while the metered amount of water is being introduced into the inlet of the first static mixing device, metered amounts of each of the concentrated liquid chemical solutions from said storage containers are introduced into inlets of respective static mixing devices such that the inlet of each static mixing device receives only one of the concentrated liquid chemical solutions, with the other concentrated chemical solutions being introduced into the inlet of the other respective static mixing devices, whereby as the metered amount of water flows through each static mixing device in the series of static mixing devices, a respective, concentrated liquid chemical solution is mixed therewith, and the working solution from the outlet of the last static mixing device consists of a diluted solution formed from the mixing of the concentrated liquid chemicals and the water in the static mixing devices;
• and
• feeding the working solution from the last static mixing device in the inline mixing means to the processing machine.

A method of preparing a diluted working solution from at least three concentrated liquid chemical solutions and delivering the working solution to a processing machine, said method comprising

• providing separate, distinct storage containers, at least one storage container for each of the concentrated liquid chemical solutions;
• upon demand from the processing machine for working solution, a metered amount of water is introduced into a static, inline mixing means that comprises first and second static mixing devices, with each static mixing device having an inlet and an outlet and with the static mixing devices being connected in series such that the inlet of the second static mixing device is connected to the outlet of the first static mixing device and further with the metered amount of water being introduced into the first inlet of the first static mixing device so that the metered amount of water flows initially through the first static mixing device and then through the second static mixing device;
• and
• while the metered amount of water is being introduced into the inlet of the first static metering device, a metered amount of one of the concentrated liquid chemical solutions from a respective storage container is also introduced into the inlet of the first static mixing device, and metered amounts of the remaining concentrated liquid chemical solutions from remaining respective storage containers are introduced into the inlet of the second static mixing device, whereby as the metered amount of water flows through the first static mixing device, said one of the concentrated liquid chemical solutions is mixed therewith, and as the metered amount of water flows through the second static mixing device, all remaining concentrated liquid chemical solutions are mixed therewith, and the solution from the outlet of the second static mixing device consists of a diluted working solution formed from the mixing of the concentrated liquid chemicals and water in the static mixing devices;
• and
• feeding the working solution from the second static mixing device to the processing machine.