CN114590034B - Ink separating device and substrate processing system having the same - Google Patents
Ink separating device and substrate processing system having the same Download PDFInfo
- Publication number
- CN114590034B CN114590034B CN202111515867.7A CN202111515867A CN114590034B CN 114590034 B CN114590034 B CN 114590034B CN 202111515867 A CN202111515867 A CN 202111515867A CN 114590034 B CN114590034 B CN 114590034B
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- ink
- solution
- sedimentation velocity
- ink solution
- inkjet head
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- 239000000758 substrate Substances 0.000 title claims abstract description 52
- 238000004062 sedimentation Methods 0.000 claims abstract description 109
- 239000002245 particle Substances 0.000 claims abstract description 67
- 238000005259 measurement Methods 0.000 claims description 58
- 238000003860 storage Methods 0.000 claims description 31
- 239000007788 liquid Substances 0.000 claims description 21
- 238000000926 separation method Methods 0.000 claims description 15
- 230000008929 regeneration Effects 0.000 claims description 9
- 238000011069 regeneration method Methods 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 14
- 230000002776 aggregation Effects 0.000 description 6
- 238000005054 agglomeration Methods 0.000 description 5
- 230000002950 deficient Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 125000002015 acyclic group Chemical group 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/195—Ink jet characterised by ink handling for monitoring ink quality
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/6715—Apparatus for applying a liquid, a resin, an ink or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
- B41J2/185—Ink-collectors; Ink-catchers
- B41J2002/1856—Ink-collectors; Ink-catchers waste ink containers
Abstract
The present invention provides an ink separating apparatus for separating normal ink and bad ink by measuring a settling velocity of ink particles, and a substrate processing system having the same. The ink separating apparatus includes: a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution, wherein if the ink solution is judged to be normal ink, the ink is supplied to the inkjet head unit, and if the ink solution is judged to be bad ink, the ink is discarded.
Description
Technical Field
The present invention relates to an ink separating apparatus and a substrate processing system having the same. And more particularly, to an ink separating apparatus applicable to a circulating type ink jet system and a substrate processing system having the same.
Background
When a printing process (e.g., RGB Patterning) is performed on a transparent substrate in order to manufacture a display device such as an LCD panel, a PDP panel, an LED panel, or the like, a printing apparatus having an Inkjet Head Unit (Inkjet Head Unit) may be used.
Disclosure of Invention
Recently, a circulation type inkjet system is applied to printing equipment so that an Ink solution (Ink) can be reused.
However, in the circulation type ink jet system, a phenomenon in which an ink solution is deposited in a pipe or a Reservoir (Reservoir) occurs due to a particle agglomeration phenomenon. At this time, deposited particles may grow to affect the flow rate inside the pipe, whereby the ink solution cannot maintain a certain flow rate.
In addition, the agglomerated particles cause clogging of nozzles (nozzles) of the inkjet head unit and contaminate the surroundings of the nozzles, resulting in misbouncing of the ejection (Jetting) and affecting the life of the nozzles.
The present invention has been made to solve the technical problem of providing an ink separating apparatus for separating normal ink and bad ink by measuring a sedimentation velocity of ink particles, and a substrate processing system having the same.
The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.
An aspect of the ink separating apparatus of the present invention for solving the above technical problems includes: a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and a control unit that determines the ink solution as either one of normal ink and poor ink based on a settling speed of the ink solution, wherein the ink is supplied to the inkjet head unit if the ink solution is determined as normal ink, and the ink is discarded if the ink solution is determined as poor ink.
The sedimentation velocity measuring section may measure the sedimentation velocity of the ink solution using at least one of the intensity of the laser signal and the amount of change in the current.
In the case where the sedimentation velocity measurement section uses the intensity of the laser signal, the control unit may determine the ink solution as either one of the normal ink and the poor ink based on the result obtained by comparing with the sedimentation velocity of the normal particles.
The control unit may further use at least one of the viscosity of the ink solution, the concentration of agglomerated particles in the ink solution, and the size of agglomerated particles in the ink solution when judging the ink solution as either a normal ink or a poor ink.
The sedimentation velocity measurement section may include: a reservoir that temporarily stores the ink solution; and a laser signal generation unit that divides the internal space of the reservoir into a plurality of regions and generates and outputs a laser signal for each region.
The sedimentation velocity measurement section may include: a reservoir that temporarily stores the ink solution; and a current measurement circuit provided on an inner bottom surface of the reservoir, and through which a current flows.
The current measurement circuit may determine whether or not there are agglomerated particles in the ink solution based on the amount of change in the current, or determine how many agglomerated particles are in the ink solution.
The current measurement circuit may have a grid pattern.
The current measurement circuit may measure a settling velocity of the ink solution based on a decreasing velocity of the current.
The ink separating apparatus may further include: a liquid discharge tank for storing the waste ink solution; and a switching element that guides the ink solution to any one of the inkjet head unit and the liquid discharge tank.
The switching element may be provided in a Y-tube or a T-tube.
The ink separating device may further include an ink regeneration unit that regenerates the waste ink solution.
The ink separating device may further include a drain tank storing the waste ink solution, wherein the ink regeneration unit is provided on a pipe connecting the drain tank and the ink storage tank.
The ink separation device may be provided to a circulating type ink jet apparatus.
Another aspect of the ink separating apparatus of the present invention for solving the above technical problems includes: a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and a control unit that determines the ink solution as either one of normal ink and poor ink based on a settling velocity of the ink solution, wherein the settling velocity measuring section measures the settling velocity of the ink solution using at least one of an intensity of a laser signal and a variation amount of an electric current, and supplies the ink to the inkjet head unit if the ink solution is determined as normal ink, and discards the ink if the ink solution is determined as poor ink.
One aspect of the substrate processing system of the present invention for solving the above-described technical problems includes: an inkjet head unit that ejects an ink solution onto a substrate; an ink storage tank that stores the ink solution; and an ink separating device that supplies the ink solution to the inkjet head unit or discards the ink solution when the ink solution is received from the ink storage tank, wherein the ink separating device includes: a sedimentation velocity measuring section that measures a sedimentation velocity of an ink solution supplied to the inkjet head unit; and a control unit that determines the ink solution as either one of normal ink and poor ink based on a settling speed of the ink solution, wherein the ink is supplied to the inkjet head unit if the ink solution is determined as normal ink, and the ink is discarded if the ink solution is determined as poor ink.
The substrate processing system may be a printing apparatus for printing the substrate.
Specific details of other embodiments are included in the detailed description and the accompanying drawings.
Drawings
Fig. 1 is a perspective view schematically showing an internal structure of a substrate processing system having an ink separating apparatus according to various embodiments of the present invention.
Fig. 2 is a plan view schematically showing an internal structure of a substrate processing system having an ink separating apparatus according to various embodiments of the present invention.
Fig. 3 is an exemplary diagram for explaining a process of generating a deposit in an ink storage tank or a pipe due to a particle agglomeration phenomenon.
Fig. 4 is an exemplary diagram for explaining defective ejection of the inkjet head unit.
Fig. 5 is a diagram schematically showing the structure of an ink separating apparatus according to an embodiment of the present invention.
Fig. 6 is a first exemplary diagram schematically showing an internal configuration of a sedimentation velocity measurement portion constituting an ink separation device according to an embodiment of the present invention.
Fig. 7 is an exemplary diagram for explaining an operation method of the sedimentation velocity measurement section shown in fig. 6.
Fig. 8 is a second exemplary diagram schematically showing an internal configuration of a sedimentation velocity measurement portion constituting an ink separation device according to an embodiment of the present invention.
Fig. 9 is an exemplary diagram for explaining an operation method of the sedimentation velocity measurement section shown in fig. 8.
Fig. 10 is a diagram schematically showing the structure of an ink separating apparatus according to another embodiment of the present invention.
Description of the reference numerals
100: the substrate processing system 110: base member
120: the substrate supporting unit 130: hanger unit
140: hanger moving unit 150: ink jet head unit
160: inkjet head moving unit 190: ink supply unit
191: ink storage tank 310: pipeline
320: normal particles 330: agglomerated particles
350: nozzle 360: normal ejection
370: poor ejection 400: ink separator
410: sedimentation velocity measurement unit 420: control unit
430: switching element 440: liquid discharge box
450: an ink regeneration unit 510: liquid storage device
520: laser signal generation unit 530: current measuring circuit
610: first interval 620: a second interval
630: third interval 710: particles
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention and the method of achieving them will become apparent by referring to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms different from each other, which are provided only for complete disclosure of the present invention and to fully inform a person of ordinary skill in the art of the scope of the present invention, which is limited only by the scope of the claims. Throughout the specification, like reference numerals refer to like constituent elements.
An element or layer is referred to as being "on" or "over" another element or layer, and includes not only the element or layer directly on, but also other layers or intervening elements. In contrast, an element being referred to as being "directly on" or directly above "another element indicates that there are no other elements or layers intervening.
In order to easily describe the correlation of one element or constituent element with another element or constituent element as shown in the drawings, spatially relative terms "lower", "upper", and the like may be used. It will be understood that spatially relative terms are intended to encompass different orientations of the elements in use or operation in addition to the orientation depicted in the figures. For example, when an element shown in the drawings is turned over, elements described as "below" or "beneath" another element could be located "above" the other element. Thus, the exemplary term "below" may include both below and above directions. Elements may also be oriented in another direction, whereby spatially relative terms may be construed in accordance with the orientation.
Although the terms "first," "second," etc. may be used to describe various elements, components, and/or portions, these elements, components, and/or portions are obviously not limited by these terms. These terms are only used to distinguish one element, component, and/or section from another element, component, and/or section. Therefore, the first element, the first component, or the first part mentioned below may be the second element, the second component, or the second part, as is apparent within the technical idea of the present invention.
The terminology used in the description is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In this specification, the singular forms also include the plural unless specifically mentioned in the sentence. The use of "comprising" and/or "including" in the specification does not exclude the presence or addition of more than one other elements, steps, operations and/or components than those mentioned.
All terms (including technical and scientific terms) used in this specification, if not other, can be used in the meaning commonly understood by one of ordinary skill in the art to which this invention belongs. Furthermore, terms defined in commonly used dictionaries are not intended to be interpreted as being ideal or excessively unless specifically defined.
Embodiments of the present invention will be described in detail below with reference to the drawings, and in the description with reference to the drawings, the same or corresponding components are given the same reference numerals regardless of the reference numerals, and the repeated description thereof will be omitted.
The present invention is applicable to a circulating type ink jet system, and relates to an ink separating apparatus that separates normal ink and bad ink, and a substrate processing system having the same. The ink separating apparatus according to the present invention can separate normal ink and bad ink by measuring the sedimentation velocity of ink particles.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and the like.
First, a substrate processing system having an ink separating apparatus will be described.
Fig. 1 is a perspective view schematically showing an internal structure of a substrate processing system having an ink separating apparatus according to various embodiments of the present invention. Further, fig. 2 is a plan view schematically showing an internal structure of a substrate processing system having an ink separating apparatus according to various embodiments of the present invention.
According to fig. 1 and 2, the substrate processing system 100 may include a base member 110, a substrate supporting Unit 120, a hanger Unit (Gantry Unit) 130, a hanger moving Unit 140, an inkjet head Unit 150, an inkjet head moving Unit 160, a droplet ejection amount measuring Unit 170, a nozzle checking Unit 180, and an ink supply Unit 190.
The substrate processing system 100 is used for printing substrates. For example, such a substrate processing system may be realized by a printing apparatus that ejects ink or the like onto a substrate using an Inkjet Head Unit (ink Head Unit).
The base member 110 constitutes a main body of the substrate processing system 100. The substrate supporting unit 120 may be disposed at an upper portion of such a base member 110.
The substrate support unit 120 supports the substrate S during the printing process on the substrate S. Such a substrate supporting unit 120 may include a supporting plate 121, a rotation driving part 122, and a linear driving part 123.
The support plate 121 is used for mounting the substrate S. The rotation driving part 122 may be provided at a lower portion of such a support plate 121.
The rotation driving part 122 is used to rotate the support plate 121. Such a rotation driving member 122 may rotate the support plate 121 using a rotation center axis formed in a perpendicular direction (third direction 30) with respect to a longitudinal direction (first direction 10) of the support plate 121 or a width direction (second direction 20) of the support plate 121.
When the support plate 121 is rotated by the rotation driving part 122, the substrate S may also be rotated along with the support plate 121. For example, in the case where the longitudinal direction of a cell formed on the substrate S to be coated with an Ink Droplet (Ink Droplet) is oriented in the first direction 10, the rotation driving part 122 may rotate the substrate S such that the longitudinal direction of the cell is oriented in the second direction 20.
The linear driving member 123 is configured to linearly move the support plate 121. Such a linear driving member 123 can linearly move the support plate 121 in the second direction 20. The linear driving part 123 may include a guide part 124 and a slider 125.
The guide member 124 serves to guide the moving path of the support plate 121. Such a guide member 124 may extend in the upper center of the base member 110 with the second direction 20 as a length direction.
The slider 125 moves linearly along the guide member 124. For this, a linear motor (not shown) may be built in the slider 125. On the other hand, the rotation driving part 122 may be disposed at an upper portion of the slider 125.
The hanger unit 130 serves to support the inkjet head unit 150. Such a hanger unit 130 may be disposed at an upper portion of the substrate supporting unit 120. The hanger unit 130 may be provided to have a vertical direction (first direction 10) with respect to the longitudinal direction of the guide member 124 as a longitudinal direction.
The hanger moving unit 140 is used to linearly move the hanger unit 130 in the second direction 20. Such a hanger moving unit 140 may be disposed inside the hanger unit 130, and may include a first moving module 141 and a second moving module 142.
The first moving module 141 may be disposed at one end within the hanger unit 130. Such a first moving module 141 may slide along a first guide rail 210 provided at an upper side of the base member 110.
The second moving module 142 may be disposed at the other end portion within the hanger unit 130. Such a second moving module 142 can slide along a second guide rail 220 provided at the other side of the upper portion of the base member 110.
The inkjet head unit 150 is for ejecting ink in the form of droplets (droplets) onto the substrate S. Such an inkjet head unit 150 may be disposed at a side of the hanger unit 130, and may be supported by the hanger unit 130.
The inkjet head unit 150 may be linearly moved in the length direction (first direction 10) of the hanger unit 130 by the inkjet head moving unit 160. However, the present embodiment is not limited thereto. The inkjet head unit 150 may also be linearly moved in the height direction (third direction 30) of the hanger unit 130. In this case, the inkjet head unit 150 may move on the inkjet head moving unit 160. On the other hand, the head unit 150 may also be rotated with respect to the head moving unit 160 about an axis parallel to the third direction 30.
At least one inkjet head unit 150 may be provided to the hanger unit 130. For example, the inkjet head unit 150 may include a first head module 151, a second head module 152, and a third head module 153 to be provided in three on the hanger unit 130. In the case where the inkjet head units 150 are provided in plurality like this, the inkjet head units 150 may be sequentially arranged along the length direction (first direction 10) of the hanger unit 130.
The first, second, and third head modules 151, 152, and 153 may include nozzles (not shown) and nozzle plates (not shown), respectively. The nozzles are used to eject ink droplets, and may be provided on a nozzle plate. A plurality of nozzles (e.g., 128, 256, etc.) may be provided on each head module 151, 152, 153.
The inkjet head unit 150 may include piezoelectric elements corresponding to the number of nozzles. At this time, the ink droplet ejection amounts of the respective nozzles can be controlled independently by controlling the voltages applied to the piezoelectric elements, respectively.
The head moving unit 160 is configured to linearly move the head unit 150. Such inkjet head moving units 160 may be provided in the substrate processing system 100 corresponding to the number of the inkjet head units 150. In this case, the plurality of inkjet head units 150 may be individually moved.
On the other hand, the inkjet head moving unit 160 may be provided as one in the substrate processing system 100. In this case, the plurality of inkjet head units 150 may be moved simultaneously, not individually.
The droplet ejection amount measurement unit 170 is used to measure the droplet ejection amount of the inkjet head unit 150. Such a droplet discharge amount measuring unit 170 may be provided adjacent to the substrate supporting unit 120 on the base member 110.
The droplet discharge amount measuring unit 170 may measure the amount of droplets discharged from at least one nozzle provided to the inkjet head unit 150. In this case, the inkjet head unit 150 may be moved in the first direction 10 and the second direction 20 by the hanger moving unit 140 and the inkjet head moving unit 160 so as to be located at an upper portion of the droplet discharge amount measuring unit 170. Further, the head moving unit 160 may move the head unit 150 in the third direction 30 to adjust the distance in the up-down direction between the head unit 150 and the droplet discharge amount measuring unit 170. In the present embodiment, whether or not there is an abnormality in the nozzles provided in the inkjet head unit 150 can be macroscopically confirmed based on the result obtained by comparing the measured value of the droplet discharge amount measuring unit 170 with the reference value.
The nozzle check unit 180 is used to confirm whether or not there is an abnormality in each nozzle provided to the inkjet head unit 150. For example, the nozzle checking unit 180 may confirm whether the nozzle is abnormal using optical checking. The nozzle check unit 180 may be provided adjacent to the substrate support unit 120 on the base member 110 as the droplet discharge amount measuring unit 170.
If the nozzle discharge amount measurement unit 170 macroscopically confirms whether or not there is an abnormality in the nozzles, as a result of which it is determined that some of the nozzles are abnormal, the nozzle check unit 180 may check all the nozzles while confirming whether or not the corresponding nozzles are abnormal. In this case, the inkjet head unit 150 may be moved in the first direction 10 and the second direction 20 by the hanger moving unit 140 and the inkjet head moving unit 160 so as to be located at an upper portion of the nozzle checking unit 180. Further, the head moving unit 160 may move the head unit 150 in the third direction 30 to adjust the distance in the up-down direction between the head unit 150 and the nozzle check unit 180.
The ink supply unit 190 is used to supply ink to the inkjet head unit 150. Such an ink supply unit 190 may include an ink storage tank 191 and a pressure adjustment module 192.
The ink storage tank 191 is for storing ink. Such an ink storage tank 191 may be provided in such a manner as to be coupled to a side surface of the hanger unit 130.
The pressure adjustment module 192 is used to adjust the internal pressure of the ink storage tank 191. The ink storage tank 191 may supply an appropriate amount of ink to the inkjet head unit 150 based on the pressure provided by the pressure adjustment module 192.
In the case where the substrate processing system 100 includes a circulating type ink jet system, as shown in fig. 3, there is a possibility that an ink solution may be deposited in the ink storage tank 191 or the pipe 310 connecting the ink storage tank 191 and the inkjet head unit 150 due to a particle agglomeration phenomenon.
In fig. 3, reference numerals 320 and 330 denote normal particles and agglomerated particles, respectively, and reference numeral 340 denotes a state in which the agglomerated particles 330 are deposited in the pipe 310. Fig. 3 is an exemplary diagram for explaining a process of generating a deposit in an ink storage tank or a pipe due to a particle agglomeration phenomenon.
If the aggregated particles 330 are deposited in the ink storage tank 191 or the pipe 310 as such, the aggregated particles 330 may grow as indicated by reference numeral 340 to affect the flow rate inside the pipe 310, and the ink solution may not maintain a certain flow rate.
In particular, as shown in fig. 4, the condensed particles 330 may be adsorbed to the nozzles 350 of the inkjet head unit 150, thereby causing poor ejection 370 of the ink solution instead of normal ejection 360 of the ink solution, and contaminating the surroundings of the nozzles 350, thereby shortening the life of the nozzles 350. Fig. 4 is an exemplary diagram for explaining defective ejection of the inkjet head unit.
Hereinafter, in order to solve the above-described problems, an ink separation device that separates defective ink that may cause defective ejection and shortened nozzle life from normal ink will be described. The ink separating device may separate normal ink from bad ink by measuring the sedimentation velocity of ink particles.
Fig. 5 is a diagram schematically showing the structure of an ink separating apparatus according to an embodiment of the present invention.
According to fig. 5, the ink separation device 400 may include an inkjet head unit 150, an ink storage tank (Supply Reservoir) 191, a settling velocity measuring section 410, a control unit 420, a switching element 430, and a Drain tank (Drain Box) 440.
As for the inkjet head unit 150 and the ink storage tank 191, description has been made with reference to fig. 1 and 2, and thus detailed description thereof is omitted here.
The sedimentation velocity measuring section 410 is for measuring the sedimentation velocity of the ink solution. In the present embodiment, the sedimentation velocity measuring section 410 may measure the sedimentation velocity of the ink solution using a Laser (Laser), or measure the sedimentation velocity of the ink solution using a current value.
First, a method of measuring the sedimentation velocity of an ink solution by using a laser will be described.
In the above case, as shown in fig. 6, the sedimentation velocity measuring portion 410 may include a Reservoir (Reservoir) 510 and a laser signal generating portion 520. Fig. 6 is a first exemplary diagram schematically showing an internal configuration of a sedimentation velocity measurement portion constituting an ink separation device according to an embodiment of the present invention. The following description is made with reference to fig. 6.
The reservoir 510 is used to temporarily store the ink solution. Such a reservoir 510 may be provided on a pipe connecting the ink storage tank 191 and the inkjet head unit 150, or may be provided on a pipe connecting the ink storage tank 191 and the liquid discharge tank 440.
The laser signal generating section 520 is configured to generate and output a laser signal for the ink solution stored in the reservoir 510. Such a laser signal generating part 520 may divide the internal space of the reservoir 510 into a plurality of regions and output laser signals for the respective regions.
For example, the laser signal generating part 520 may divide the internal space of the reservoir 510 into an upper region, a middle region, and a lower region, and output the first, second, and third laser signals to the upper region, the middle region, and the lower region. At this time, the laser signal generating section 520 may output the first laser signal, the second laser signal, and the third laser signal at the same time, but may output the first laser signal, the second laser signal, and the third laser signal at different times from each other with a constant time difference.
On the other hand, the laser signal generating unit 520 may output several laser signals at the same time, and output other several laser signals at different times with a constant time difference.
Next, an operation method of the sedimentation velocity measuring portion 410 when the sedimentation velocity measuring portion 410 includes the liquid reservoir 510 and the laser signal generating portion 520 will be described.
Fig. 7 is an exemplary diagram for explaining an operation method of the sedimentation velocity measurement section shown in fig. 6. The following description is made with reference to fig. 6 and 7.
The sedimentation velocity of the ink solution is measured by dividing the internal space of the reservoir 510 into a first section 610 located at the upper portion, a second section 620 located between the upper portion and the lower portion, and a third section 630 located at the lower portion.
When the ink solution flows from the ink storage tank 191 into the reservoir 510, the laser signal generating section 520 generates and outputs laser signals for the first section 610, the second section 620, and the third section 630.
In the present embodiment, the Intensity value (Intensity) of the laser signal passing through the first section 610, the second section 620, and the third section 630 can be measured. For example, when 100 is input, the intensity value of the laser signal passing through each section 610, 620, 630 may be measured at 30 in the first section 610, 50 in the second section 620, 80 in the third section 630, etc., and the difference in the intensity value of the laser signal measured at each section 610, 620, 630 means the sedimentation velocity of the particles.
The sedimentation velocity of the particles may vary depending on the viscosity of the ink solution or the concentration of the particles. Therefore, if a device capable of feeding back (Feedback) real-time information based on the sedimentation velocity data of the normal particles 320 is provided, the internal particle state of the ink solution can be analogized by Database (DB) formation by the information obtained from the Feedback device.
For example, when the sedimentation velocity of the ink solution is measured by the sedimentation velocity measuring section 410 based on the intensity value of the laser signal, the control unit 420 may compare the value with a reference value (for example, sedimentation velocity data of the normal particles 320), thereby judging the ink solution as either one of normal ink and poor ink.
On the other hand, in the present embodiment, the state of the ink solution may also be classified by analyzing factors that may affect the sedimentation rate of the ink solution, such as the viscosity of the ink solution, the concentration of the aggregated particles 330, the size of the aggregated particles 330, and the like.
In this embodiment, the ink may be managed in advance by confirming the timing of generating a large amount of aggregated particles 330 in the ink solution according to the type of ink.
Further, in the present embodiment, not only the state of the ink transferred to the normal circulation path but obviously also the state of the ink inside the ink storage tank 191 that supplies to the pipe can be confirmed.
Next, a method of measuring the sedimentation velocity of the ink solution using the current value will be described.
In the above case, as shown in fig. 8, the sedimentation velocity measurement section 410 may include a reservoir 510 and a current measurement circuit 530. Fig. 8 is a second exemplary diagram schematically showing an internal configuration of a sedimentation velocity measurement portion constituting an ink separation device according to an embodiment of the present invention. The following description is made with reference to fig. 8.
The reservoir 510 has been described with reference to fig. 6, and thus a detailed description thereof will be omitted herein.
The current measurement circuit 530 is used to measure a change in current associated with whether or not there are agglomerated particles 330 in the ink solution or how much of the agglomerated particles 330 are. Such a current measurement circuit 530 may be provided at the inner bottom surface of the reservoir 510.
The current measurement circuit 530 may be implemented by a circuit having a grid-like morphology pattern. However, the present embodiment is not limited thereto. The current measurement circuit 530 may also be implemented by a circuit having a different pattern if it is capable of measuring the amount of change in current associated with the presence or amount of agglomerated particles 330 deposited in the ink solution.
Next, an operation method of the sedimentation velocity measuring unit 410 when the sedimentation velocity measuring unit 410 includes the liquid reservoir 510 and the current measuring circuit 530 will be described.
Fig. 9 is an exemplary diagram for explaining an operation method of the sedimentation velocity measurement section shown in fig. 8. The following description is made with reference to fig. 8 and 9.
If particles (particles) 710 of ink are deposited on the bottom, the Current output (Current out) value is reduced compared to the initial Current value due to the resistance of the particles. In this embodiment, it can be expressed as a function of time to meter the rate of particle settling over time.
If the particles fall on the current measurement circuit 530, a variation in current is generated. When the amount of change in the current related to how much of the aggregated particles 330 is measured, if there are more aggregated particles 330 inside the ink solution, the speed of particle sedimentation increases, and thus the speed of current decrease in the current measurement circuit 530 increases. Conversely, if there are fewer agglomerated particles 330 inside the ink solution, the rate at which the particles settle will be slower, and thus the rate at which the current in the current measurement circuit 530 decreases will also be slower.
Similarly, when the amount of change in the current associated with the presence or absence of the aggregated particles 330 is measured, if the aggregated particles 330 are present in the ink solution, the sedimentation rate of the particles is generated, and thus the rate of current decrease is also generated in the current measurement circuit 530. In contrast, if the inside of the ink solution does not agglomerate the particles 330, the sedimentation velocity of the particles is not generated or weak, and thus the velocity of current decrease is not generated or the velocity of current decrease is weak in the current measurement circuit 530.
In the present embodiment, as described above, the control unit 420 may determine the ink solution as either of the normal ink and the bad ink by monitoring the amount of change in the current by the sedimentation velocity measuring portion 410.
On the other hand, if the sedimentation velocity measurement portion 410 described with reference to fig. 6 and 7 is defined as a first sedimentation velocity measurement portion, and the sedimentation velocity measurement portion 410 described with reference to fig. 8 and 9 is defined as a second sedimentation velocity measurement portion, the ink separation device 400 may include both the first sedimentation velocity measurement portion and the second sedimentation velocity measurement portion.
However, the present embodiment is not limited thereto. The ink separation device 400 may include only any one of the first sedimentation velocity measurement portion and the second sedimentation velocity measurement portion.
The description is made with reference to fig. 5 again.
The control unit 420 determines the ink solution stored in the reservoir 510 as either of normal ink and poor ink based on the particle sedimentation velocity measurement result of the sedimentation velocity measurement section 410. That is, the control unit 420 may separate normal particles and agglomerated particles according to the sedimentation velocity measured by the above two methods and determine the internal circulation.
The control unit 420 may also perform a function of controlling the switching element 430 based on the determination result of the ink solution (i.e., determining the ink solution as either one of normal ink and bad ink).
The switching element 430 may be implemented by an on/off switch, and may function to open or close a passage in a pipe. Such a switching element 430 may operate according to the control of the control unit 420, and may operate according to the judgment result of the control unit 420.
The switching element 430 may be disposed on the Y-tube. In the case where the ink solution moves from the first side to any one of the second side and the third side through the Y-shaped pipe, the switching elements 430 may be disposed at the second side and the third side, respectively, and control the flow of the ink solution.
As described above, the control unit 420 may determine the ink solution as either one of normal ink and bad ink. Accordingly, when the ink solution is judged to be normal ink, the switching element 430 may open the pipe connecting the sedimentation velocity measuring part 410 and the inkjet head unit 150, and close the pipe connecting the sedimentation velocity measuring part 410 and the liquid discharge tank 440. In this case, the ink solution determined to be normal ink may be moved to the ink storage tank 191 via the inkjet head unit 150, thereby realizing a circulating type inkjet system.
In contrast, when the ink solution is judged to be poor ink, the switching element 430 may close the pipe connecting the sedimentation velocity measurement section 410 and the inkjet head unit 150, and open the pipe connecting the sedimentation velocity measurement section 410 and the liquid discharge tank 440. In this case, the ink solution determined as the defective ink may be discarded through the liquid discharge tank 440.
On the other hand, the switching element 430 may be provided on the tee.
The liquid discharge tank 440 is used to temporarily store an ink solution determined to be poor ink. The ink solution stored in the drain tank 440 may be discarded, but may be regenerated.
Fig. 10 is a diagram schematically showing the structure of an ink separating apparatus according to another embodiment of the present invention.
Referring to fig. 10, the ink separation device 400 may include an inkjet head unit 150, an ink storage tank 191, a settling velocity measuring part 410, a control unit 420, a switching element 430, a liquid discharge tank 440, and an ink regeneration unit 450.
The inkjet head unit 150, the ink storage tank 191, the sedimentation velocity measuring portion 410, the control unit 420, the switching element 430, and the liquid discharge tank 440 have been described with reference to fig. 5, and thus a detailed description thereof is omitted herein.
The ink regeneration unit 450 is for regenerating the ink solution determined to be poor ink. Such an ink regeneration unit 450 may be provided on a pipe connecting the liquid discharge tank 440 and the ink storage tank 191 so as to move the ink solution stored in the liquid discharge tank 440 to the ink storage tank 191 after regenerating the ink solution.
In the present embodiment, in the case where the ink separation device 400 includes the ink regeneration unit 450, the ink solution having the aggregated particles 330 can be reused, and the ink solution having the aggregated particles 330 can be resupplied to the ink storage tank 191 so as to prevent the aggregated particles 330 from flowing into the circulation duct. On the other hand, the ink solution having the normal particles 320 may be ejected or circulated by the inkjet head unit 150 and supplied again to the ink storage tank 191.
In the above, the ink separating apparatus 400 and the substrate processing system 100 having the same according to various embodiments of the present invention are described with reference to fig. 1 to 10. The ink separating apparatus 400 is a system for separating bad ink and normal ink by measuring the sedimentation velocity of ink particles. Such an ink separation device 400 may be suitable for use in a circulating inkjet system to maintain the life of inkjet equipment and improve poor ejection.
The ink separation device 400 and the substrate processing system 100 may be adapted for use with Inkjet equipment (e.g., QD CF Inkjet). The features of the ink separator 400 are again sorted as follows.
First, the sedimentation velocity measurement unit 410 may be applied to a circulating inkjet system or an acyclic inkjet system.
Second, the sedimentation velocity measurement section 410 is applicable to a circulating inkjet pipeline regardless of position.
Third, although a single Y-tube connecting the sedimentation velocity measurement section 410, the inkjet head unit 150, and the liquid discharge tank 440 may function to separate particles, a plurality of Y-tubes may be used.
Fourth, the sedimentation velocity measuring section 410 can be used not only for aggregation measurement of particles but also for foreign matter removal.
Fifth, the measurement of sedimentation velocity can be used not only for the agglomeration metering of particles, but also for the ink management inside the apparatus.
Sixth, measurement of sedimentation velocity by laser light is performed based on diffuse reflection and/or transmittance.
Seventh, although the area measurement is performed at the time of measuring the sedimentation velocity, the measurement may be performed once in a scanning form.
While the embodiments of the present invention have been described above with reference to the drawings, it will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Accordingly, it should be understood that the above-described embodiments are illustrative in all respects, rather than restrictive.
Claims (18)
1. An ink separating apparatus comprising:
a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and
a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution,
wherein the ink is supplied to the inkjet head unit if the ink solution is judged to be normal ink, the ink is discarded if the ink solution is judged to be poor ink,
wherein the sedimentation velocity measuring section measures the sedimentation velocity of the ink solution using at least one of the intensity of the laser signal and the amount of change in the current.
2. The ink separating apparatus according to claim 1, wherein,
in the case where the sedimentation velocity measuring section uses the intensity of the laser signal, the control unit judges the ink solution as either one of normal ink and poor ink based on a result obtained by comparing the sedimentation velocity with the sedimentation velocity of normal particles.
3. The ink separating apparatus according to claim 2, wherein,
when the ink solution is judged to be either one of normal ink and poor ink, the control unit further uses at least one factor of the viscosity of the ink solution, the concentration of agglomerated particles in the ink solution, and the size of agglomerated particles in the ink solution.
4. An ink separating apparatus comprising:
a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and
a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution,
wherein the ink is supplied to the inkjet head unit if the ink solution is judged to be normal ink, the ink is discarded if the ink solution is judged to be poor ink,
wherein the sedimentation velocity measurement section includes:
a reservoir that temporarily stores the ink solution; and
and a laser signal generating unit that divides the internal space of the liquid reservoir into a plurality of regions and generates and outputs a laser signal for each region.
5. An ink separating apparatus comprising:
a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and
a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution,
wherein the ink is supplied to the inkjet head unit if the ink solution is judged to be normal ink, the ink is discarded if the ink solution is judged to be poor ink,
wherein the sedimentation velocity measurement section includes:
a reservoir that temporarily stores the ink solution; and
and a current measurement circuit provided on an inner bottom surface of the reservoir, and through which a current flows.
6. The ink separating apparatus according to claim 5, wherein,
the current measurement circuit determines whether or not there are agglomerated particles in the ink solution, or determines how many agglomerated particles are in the ink solution, based on the amount of change in the current.
7. The ink separating apparatus according to claim 5, wherein,
the current measurement circuit has a grid pattern.
8. The ink separating apparatus according to claim 5, wherein,
the current measurement circuit measures a sedimentation velocity of the ink solution based on a decrease velocity of the current.
9. An ink separating apparatus comprising:
a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and
a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution,
wherein the ink is supplied to the inkjet head unit if the ink solution is judged to be normal ink, the ink is discarded if the ink solution is judged to be poor ink,
wherein the ink separating apparatus further comprises:
a liquid discharge tank for storing the waste ink solution; and
and a switching element that guides the ink solution to either one of the inkjet head unit and the liquid discharge tank.
10. The ink separating apparatus according to claim 9, wherein,
the switching element is provided in a Y-shaped pipe or a T-shaped pipe.
11. An ink separating apparatus comprising:
a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and
a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution,
wherein the ink is supplied to the inkjet head unit if the ink solution is judged to be normal ink, the ink is discarded if the ink solution is judged to be poor ink,
wherein the ink separation device further includes an ink regeneration unit that regenerates the waste ink solution.
12. The ink separating apparatus of claim 11, further comprising a drain tank storing the waste ink solution,
wherein the ink regeneration unit is arranged on a pipeline connecting the liquid discharge box and the ink storage tank.
13. An ink separating apparatus comprising:
a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and
a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution,
wherein the ink is supplied to the inkjet head unit if the ink solution is judged to be normal ink, the ink is discarded if the ink solution is judged to be poor ink,
wherein the ink separation device is provided to the circulation type ink jet equipment.
14. A substrate processing system, comprising:
an inkjet head unit that ejects an ink solution onto a substrate;
an ink storage tank that stores the ink solution; and
an ink separating device that supplies the ink solution to the inkjet head unit or discards the ink solution when the ink solution is received from the ink storage tank,
wherein the ink separating device includes:
a sedimentation velocity measuring section that measures a sedimentation velocity of the ink solution supplied to the inkjet head unit; and
a control unit that judges the ink solution as either one of normal ink and bad ink based on a sedimentation velocity of the ink solution,
wherein the ink is supplied to the inkjet head unit if the ink solution is judged to be normal ink, and the ink is discarded if the ink solution is judged to be poor ink.
15. The substrate processing system of claim 14, wherein,
the substrate processing system is printing equipment for printing the substrate.
16. The substrate processing system of claim 14, wherein,
the sedimentation velocity measuring section measures the sedimentation velocity of the ink solution using at least one of the intensity of the laser signal and the amount of change in the current.
17. The substrate processing system of claim 14, wherein the sedimentation velocity measurement portion comprises:
a reservoir that temporarily stores the ink solution; and
and a laser signal generating unit that divides the internal space of the liquid reservoir into a plurality of regions and generates and outputs a laser signal for each region.
18. The substrate processing system of claim 14, wherein the sedimentation velocity measurement portion comprises:
a reservoir that temporarily stores the ink solution; and
and a current measurement circuit provided on an inner bottom surface of the reservoir, and through which a current flows.
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| KR10-2020-0166255 | 2020-12-02 | ||
| KR1020200166255A KR102568827B1 (en) | 2020-12-02 | 2020-12-02 | Apparatus for separating ink and system for treating substrate with the apparatus |
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| KR102568827B1 (en) | 2023-08-18 |
| CN114590034A (en) | 2022-06-07 |
| KR20220077372A (en) | 2022-06-09 |
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