JPS6031968A - Production unit for ink - Google Patents

Abstract

PURPOSE:To mass-produce ink having high quality continuously by removing and treating heavy metal ions in a plurality of treating sections executing ion exchange and separation and preparing ink by a dye solution treated. CONSTITUTION:A dye solution in a blending tank 24 is fed to a supply tank 31 through a filter 29 and further to a purifying section 41. The solution is fed to a plurality of ion exchange resin columns 44-1-44-3 through valves 43 opened or closed by a command from a control section 61 at that time, heavy metal ions in the dye solution are captured by ion exchange and separation, and the solution is discharged to a storage tank 49 through valves 48 when heavy metal ion concentration by a concentration sensor 46 is a fixed value or less, and flowed back to the supply tank 31 through valves 50 and a pump 51 when the concentration is the fixed value or more. The dye solution, from which heavy metals are removed, in the storage tank 49 is forwarded to a dye purifier through a valve 52 and further to an ink blending tank, thus preparing ink.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an ink manufacturing apparatus, and more particularly to an ink manufacturing apparatus suitable for preparing recording liquid (generally referred to as ink) suitable for inkjet recording, writing instruments, and the like.

(Prior Art) Conventionally, the ink used in the inkjet recording method, in which recording is performed by ejecting ink in a recording head from an ejection orifice using vibrations caused by a piezo vibrator, has been made by mixing various dyes and pigments with water or other organic solvents. It is known to be dissolved or dispersed in a liquid medium consisting of: It is also known that similar inks are used in writing instruments such as felt pens and fountain pens.

An example of a general basic composition of such an ink is one in which the main components are a water-soluble dye, water as its solvent, and glycols as a drying inhibitor.

Here, water-soluble dyes include sodium chloride and sulfur.

Inorganic salts such as sodium acids and heavy metal ions are usually included.

When recording ink is prepared using dyes containing such inorganic ions, the following disadvantages arise. That is, inorganic ions reduce the stability of dye dissolution in the ink, causing aggregation and precipitation of the dye. Furthermore, in inkjet recording heads and writing instruments, when ink evaporates near the ejection orifice and the liquid composition changes, inorganic salts are precipitated. All of these causes clogging of the discharge orifice, which is most avoided.

Therefore, in order to eliminate such adverse effects, it is necessary to control the inorganic ion concentration to be within a predetermined range during ink production. This is essential when a commercially available dye containing an inorganic ion as an impurity is used to prepare an inkjet recording ink or a writing instrument ink.

(Objective) In view of these points, the object of the present invention is to remove heavy metal ions contained in a dye solution when preparing an ink, and to produce an ink suitable for inkjet recording, writing instruments, etc. The goal is to provide equipment.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the apparatus of the present invention. Here, 1 is an ink preparation tank, and an aqueous dye solution purified as described below is supplied from a dye purification device 2 via a valve 3. Further, from the storage section 4 and the storage section 5, a valve 6 is provided, respectively.
A water-soluble organic solvent and additives are supplied to the mixing tank 1 through and 7. Furthermore, pure water is also supplied via valve 8. Each of these supplied materials is mixed into a stirrer 8.
Mix the ink by stirring.

A liquid amount detector 10 measures the amount of ink produced in the mixing tank l.
Detected by. Further, the dye concentration and heavy metal ion concentration in the ink prepared in the mixing tank 1 are detected by a dye concentration detector 11 and a heavy metal ion concentration detector 12, respectively. Based on the output of these rain detectors,
Performs final property control (lot control) of the prepared ink. The ink whose components have been adjusted to desired values is discharged via the discharge valve 13 as necessary.

14 is a control unit that controls the drive of each part; 15
is an operation section equipped with various display sections, drive switches, etc.

FIG. 2 shows the structure of the dye purification apparatus in the apparatus shown in FIG.

Here, 21 is a dye supply section that stores dye powder 22, and supplies the dye powder 22 to a mixing tank 24 via a dye valve 23. In addition, a pure water valve 2 is provided in the mixing tank 24.
Pure water is supplied through a pure water supply pipe 28 in which a pipe 5 is inserted.

In the mixing tank 24, the supplied dye powder 22t3 and pure water are mixed and dissolved by the mixing tank stirrer 2.7 to produce one aqueous dye solution. The amount of the aqueous dye solution stored in the mixing tank 24 is detected by a mixing tank liquid amount detector 28 . The aqueous dye solution obtained in the mixing tank contains particles of dye powder that were not dissolved in the pure water, and these are removed by the filter 28. For this filter 28, ordinary filter paper, Fluoropore (trade name), or the like can be used. The dye solution from which particles and the like have been removed by passing through the filter 29 is supplied to the supply tank 31 via the dye solution supply valve 30.

A supply tank liquid level sensor 32 is disposed in the supply tank 31, and the dye solution supply valve 30 is controlled to open and close based on the output of this sensor, thereby controlling the liquid level height in the supply tank 31.

Next, 41 is a purification section that removes heavy metal ions from the aqueous dye solution, and includes a plurality of processing units, in this example, three first to third processing units h 42-1, 42-2 and 42.
- Consists of 3. each processing unit) 42 (42-1 to 42
-3), the dye aqueous solution in the supply tank 31 is supplied to the ion exchange resin column 44 (44-1 to 44-3) via the supply valve 43 (43-1 to 43-3). The ion exchange resin column 44 separates heavy metal ions from the dye aqueous solution by so-called ion exchange separation. That is, due to ion exchange within the column, highly adsorbable heavy metal ions contained in the aqueous dye solution are captured by the ion exchange resin and remain within the column. Here, valves 45 (45-1 to 45-3) for controlling the liquid level are provided in the column to control the amount of the aqueous dye solution supplied into the column. Further, the ram 44 is made detachable from the processing unit, and whether or not a column is attached is detected by a filter replacement end switch (not shown).

Next, heavy metal ion concentration sensor 4fl (4B-1 to 48
-3) is placed in the effluent solution passageway at the lower end of the column 44 to detect the heavy metal ion concentration in the effluent solution from the column 44. As a method for detecting heavy metal ion concentration,
For example, a measurement method using a metal ion electrode or a measurement method using atomic absorption spectroscopy may be used. Solution sensor 47 (4
7-1 to 47-3) are also arranged in the outflow solution passage,
The presence or absence of the effluent solution in the effluent solution passage is detected.

The effluent solution from the column 44 is passed through the first discharge valve 48 (48
-1 to 48-3) to the storage tank 49. Further, the water is refluxed to the supply tank 31 via the second discharge valves 50 (5Q-1 to 5O-3) by the action of the circulation pump 51. Opening/closing control of both valves 48 and 50 is performed based on the detection results of the heavy metal ion concentration sensor 46 as described later.

The aqueous dye solution obtained in the storage tank 49 from which heavy metal ions have been removed is taken out through the supply valve 3 as described above and used for ink preparation.

FIG. 3 shows parts related to the dye purification apparatus in the control system of the apparatus shown in FIG. Here, 101 is a controller,
In charge of drive control of each part. A read-only memory (ROM) 102 stores a control program such as the operating procedure shown in FIG. A random access memory (RAM) 103 temporarily stores various data.

Reference numeral 104 denotes various switches arranged in the operation unit 15, which send various command signals to the controller 101 via the human output buffer circuit 105. Reference numeral 108 denotes a display disposed on the operation unit 15, and as described later, a first to third unit filter replacement display indicating that the column in each processing unit needs to be replaced, and a display for each processing unit. The first to third displays indicate that the dye aqueous solution is being purified.
It has an indicator when the unit is in operation.

A drive circuit 107 controls the display of the display 108 based on a drive signal from the controller 101.

The detection outputs of the mixing tank liquid level detector 28 and the supply tank liquid level sensor 32 are sent to the controller 10 via an input buffer circuit 108.
1. The drive circuits 110 to 114 operate on each load (/help 23, 2) based on a drive control signal from the controller 101 supplied via the output buffer 7 circuit
5,3), the stirrer 27, and the pump 51) are controlled on and off.

Next, 120 is a control system of the processing unit 42-1.

Since the configuration of each processing unit is the same, the other units 42-2 and 42-3 are omitted in the figure. The detection signal from the heavy metal ion concentration sensor 48-1 is digitized via the A/D converter 121 and then supplied to the controller 101 via the input buffer circuit 122. Further, a digital detection signal is output from the solution sensor 47-1 and is supplied to the controller 101 via the input buffer circuit 122. 123, 124 and 125 are drive circuits for opening and closing the aforementioned valves 43-1, 48-1 and 50-1, respectively;
On/off control is performed by a drive signal supplied from 01 through the output buffer circuit 126.

In the dye purification apparatus of this embodiment configured as described above, based on the detection output of the heavy metal ion concentration sensor 46,
The processing units 44-1 to 44-3 are sequentially replaced to perform heavy metal ion removal processing. That is, there is a limit to the ability of the ion exchange resin in the ion exchange resin column 44 to capture heavy metal ions, and once a certain amount of heavy metal ions have been adsorbed, ion exchange separation is no longer performed. As a result, the dye solution containing heavy metal ions is discharged as is, and the concentration of heavy metal ions in the solution flowing out from the column 44 increases. By detecting this concentration increase, the use of the ion exchange resin column is disabled, and subsequent purification of the dye solution is performed using either of the other two columns.

In addition, an ion exchange resin column that is no longer usable is replaced with a new column, or the ion exchange resin is regenerated so that it can be purified again in the processing unit.

FIG. 4 shows the operation of each processing unit.

Here, each flag is used to make the following determination.

Unit filter replacement flag: A flag that instructs to replace the filter in each processing unit, that is, the ion exchange resin column. When this flag is turned on, the corresponding unit filter replacement indicator will display that filter replacement is necessary. .

Unit change request flag: A flag that requests a change in the processing unit. When this flag is turned on, the processing unit specified by the unit selection counter is selected,
Dye purification operations are transferred to that processing unit.

Unit operation flag: A flag indicating that the corresponding processing unit has been selected.

Unit operating flag: A flag that indicates that the corresponding processing unit is operating.

Unit discharge flag: A flag that turns on when the concentration of heavy metal ions in the solution flowing out from the column in the corresponding processing unit I exceeds a set value, and instructs the pump 51 to start refluxing the solution to the supply tank 31. .

Next, each step shown in FIG. 4 will be explained.

In FIG. 4(A), each display and data are initialized in step STI. In step ST2, the processing unit change request flag is turned on, and the contents of the unit selection counter are set to "1". In step ST3,
Based on the detection output of the supply tank liquid level sensor 32, it is determined whether a predetermined amount of dye solution is stored in the supply tank 31. When the predetermined amount is stored, the dye solution supply valve 30 is closed in step ST4, and then the process proceeds to step ST8. However, if the predetermined amount has not been reached, step S
At T5, the supply valve 30 is opened to supply the aqueous dye solution to the supply tank.

Step ST8 is a processing step when there is a filter replacement request in the first processing unit 42-1, and consists of step ST[l-1-8T8-3. First, when it is determined in step 5TEi-1 that the first unit filter replacement flag is in the on state, step 5T8-2
Then, it is determined whether or not the first unit filter replacement end switch is on. If it is on, step 5
Step 6-3 turns off the first unit filter replacement flag and erases the display indicating that replacement is required on the first unit filter replacement display. After this, step ST? Proceed to. Note that step 5T8-1
When the filter replacement flag is off in step 5T8-2, and when the filter replacement end switch is off in step 5T8-2, follow the flow of "NO" to step ST? Proceed to.

Step S77 and step ST8 are the second
processing unit) 42-2 and third processing unit 42-
Step ST3 is a processing step when there is a filter replacement request, and its contents are the same as step ST8, so the explanation thereof will be omitted.

In step ST8, it is determined whether or not the unit change request flag is in the on state. If the determination is affirmative, the process proceeds to step 5TIO, and if the determination is negative, the process proceeds to step 5T18 in FIG. 4(B). In step 5TIO, the content of the unit selection counter is determined. When the content is "1", the process advances to step 5T13, when it is "2", the process advances to step 5T14, and when it is "3", the process advances to step 5T15.

Steps 5T13 to 5TI5 are each processing unit) 42-
These are processing steps when 1 to 42-3 are selected.

Since the contents of each of these steps 5T13 to 5T15 are the same, the contents of step 5T13 when the first processing unit) 42-1 is selected will be explained. Well, step 5
At T13-1, it is determined whether the first unit filter replacement flag is in the off state. If the determination is negative, proceed to step 5T13-5; if the determination is affirmative, proceed to step 5T.
Proceed to 13-2. In step 5T13'-2, the first unit operation indicator is turned on and the first processing unit 42 is turned on.
-1 is in operation. Step 5T13-
3, the supply valve 43-1 and the second discharge valve 50-
Open 1. Subsequently, in step 5T13-4, the first unit operation flag is turned on and the unit change request flag is turned off. Next, in step 5T13-5, the content of the unit selection counter is set to "2", and then the process proceeds to step 5T1B.

Here, the content of the unit selection counter is r2 J
, r3 J , rl J , r2 J , . . . It is a ring counter that changes in the order of , r3 J , rl J , r2 J , . 1"
Changes to

Next, steps 5T18, 5T17 and 5T18 in FIG. 4(B) are respectively discharge control steps for the effluent solution from the ion exchange resin column in each processing unit. Since the contents of each of these steps are the same, step 5T showing the control in the first processing unit) 42-1
The contents of only 1B will be explained.

□ First, in step 5T18-1, it is determined whether the first unit operation flag is in the on state.

If the judgment is negative, jump to step 5TI6-5,
If the determination is affirmative, the process advances to step 5T1B-2. In step 5T113-2, it is determined whether the heavy metal ion concentration in the column outflow solution detected by the heavy metal ion sensor 46-1 is below a set value. If the determination is negative, proceed to step 5Tte-5; if the determination is affirmative, proceed to step 5TI6-3. In steps 5T16 to 3, the second
Close the discharge valve 50-1 and open the first discharge valve 48-1. As a result, the aqueous dye solution from which heavy metal ions have been removed to a value below the set value in the ion exchange resin column 44-1 is transferred to the storage tank 49 through the first discharge valve 48-1.
discharged inside. Next, in step 5T1B-4, the first
After turning off the unit operation flag and turning on the first unit operation flag, the process advances to step 5TI8-5.

In step 5T1B-5, it is determined whether the first unit operating flag is on. If it is in the off state, the process advances to step 5T1B-10, and if it is in the on state, the process advances to step 5T1fl-8. In step 5T1B-6, it is determined whether the concentration detected by the heavy metal ion concentration sensor 46-1 exceeds a set value. If the set value is not exceeded, the process proceeds to step 5TIEI-10, and if it is exceeded, the process proceeds to step 5T18-7. After turning off the first unit operating indicator in step 5TII (-7), the process proceeds to step 5T1B-8, where the supply valve 43-1 and the first discharge valve 48-1 are closed.Furthermore, the second discharge valve 50-1 At the same time as opening, the circulation pump 5
1 to start a reflux operation in which the solution flowing out from the column 44-1 is refluxed to the supply tank 31 via the second discharge valve 50-1. Next, in step ST9, the first
After turning off the unit operating flag and turning on the first unit discharge flag, the process advances to step 5T1B-10.

Next, in step '3TIEl-10, it is determined whether or not the first unit discharge flag is in the on state. If it is in the off state, the process proceeds to step 5T17, and if it is in the on state, the process proceeds to step 5T1B-11. move on. Step 5TIE
At i-11, it is determined whether the solution sensor 47-1 disposed in the outflow solution passage of the column 44-1 is off, that is, whether or not the outflow solution remains in the outflow solution path. When it is not in the OFF state, that is, when a solution is detected, the process proceeds to step 5T17, and when it is in the OFF state, the process proceeds to step 5T18-12. This off state means that all of the aqueous dye solution discharged from the column 44-1 and having a heavy metal ion concentration higher than the set value has been refluxed to the supply tank 31. In step 5T113-12, the first unit filter replacement indicator is turned on to display that the column of the first processing unit needs to be replaced.

Next, in step ST1[1-13, the second discharge valve 50-1 is closed, and the drive of the pump 51 is stopped to stop the recirculation operation. Next, step 5T1B-14
Now, the first unit discharge flag is turned off, the first unit filter replacement flag is turned on, and the unit change request flag is turned on. After this, the process advances to step 5T17.

Next, step STI? After passing through 5T18, the process returns to step ST3 shown in FIG. 4(A).

By executing the above-mentioned steps, the aqueous dye solution is purified in each processing unit 42-1 to 42-3, and a purified aqueous dye solution whose heavy metal ion concentration is below the set value is obtained in the storage tank 48.

(Effects) As explained above, according to the present invention, when manufacturing ink, a plurality of processing units are provided for performing ion exchange separation to capture heavy metal ions in the dye solution, and these processing units Since the ink is prepared using a dye solution from which heavy metal ions have been removed, it is possible to continuously and automatically mass-produce ink having a quality suitable for inkjet recording, writing instruments, etc.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the apparatus according to the present invention, FIG. 2 is a configuration diagram showing a dye purification device in the apparatus shown in FIG. 1, and FIG. The block diagram shown in FIGS. 4(A) and 4(B) is a flowchart showing the refining operation in the processing unit of the apparatus shown in FIG. 9 1... Ink preparation tank, 2... Dye purification device, 3... φ valve, 4... Storage section. 5... Storage part, 6... Valve, 7... Valve, 8... Valve, 8... Stirrer, lO... Liquid amount detector, 11... Dye concentration detector, 12... Heavy metal ion concentration detector, 13... Discharge valve, 14... Control section, 15... Operation section, 21... Dye supply section, 22... Dye powder, 23... Dye valve, 24... Mixing tank, 25... Pure water valve, 0 28... Pure water supply MV, 27... Mixing tank stirrer, 28... Mixing tank liquid level detector, 28. ...filtration filter 30...dye solution supply valve, 31...supply tank, 32...supply tank liquid level sensor, 41...purification section, 42...processing unit, 43...supply Valve, 44... Ion exchange resin column, 45... Valve, 46... Heavy metal ion concentration sensor, 47... Solution sensor, 48... First discharge valve, 4!3... Storage tank , 50... Second discharge valve, 51... Circulation pump, lOl... Controller, 102... Read only memory, 103... Random access memory, 104... Switch, 105... 7 human output buffer circuits, 108...Display device, 107...Drive circuit, 108...Input buffer circuit, 108...Output buffer circuit, 110-114...Drive circuit, 121...A /D converter, 122... Input buffer circuit - 123, 124, 125... Drive circuit, 128...
...Output buffer circuit is also the patent applicant Canon Co., Ltd.

Claims (1)

[Scope of Claims] A means for producing a dye solution, a plurality of solution treatment means for performing ion exchange separation to capture heavy metal ions in the dye solution, and a purified solution discharged from the plurality of solution treatment means. An ink manufacturing apparatus comprising: an ink preparation section that prepares ink using a dye solution. (Left below 5 margins)