WO2023042695A1 - 描画装置及び描画方法 - Google Patents

描画装置及び描画方法 Download PDF

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Publication number
WO2023042695A1
WO2023042695A1 PCT/JP2022/033214 JP2022033214W WO2023042695A1 WO 2023042695 A1 WO2023042695 A1 WO 2023042695A1 JP 2022033214 W JP2022033214 W JP 2022033214W WO 2023042695 A1 WO2023042695 A1 WO 2023042695A1
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WO
WIPO (PCT)
Prior art keywords
ink
inkjet head
head
pinning
ejected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/033214
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English (en)
French (fr)
Japanese (ja)
Inventor
徹 牧野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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Filing date
Publication date
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP2023548411A priority Critical patent/JPWO2023042695A1/ja
Publication of WO2023042695A1 publication Critical patent/WO2023042695A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
    • 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
    • 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

Definitions

  • the present invention relates to a drawing apparatus and a drawing method for drawing by ejecting ink.
  • a multi-axis robot arm equipped with an inkjet head has been utilized for coloring, drawing, etc. on a three-dimensional object (see, for example, Patent Document 1).
  • the multi-axis robot arm can effectively position the inkjet head on the surface of the object, and the inkjet head has the advantage of suppressing the generation of mist that scatters without adhering to the object. .
  • An object of the present invention is to provide a drawing apparatus and drawing method that enable good drawing.
  • the invention according to claim 1 provides a drawing apparatus, inkjet head, a robot arm that holds the inkjet head; a pinning device that thickens the ink ejected from the inkjet head; characterized by comprising
  • the invention according to claim 2 is the drawing apparatus according to claim 1,
  • the pinning device is characterized by increasing the viscosity of the ink ejected from the inkjet head on the surface of the object to be drawn.
  • the invention according to claim 3 is the drawing apparatus according to claim 1 or claim 2,
  • the pinning device is held by the robot arm together with the inkjet head.
  • the invention according to claim 4 is the drawing apparatus according to any one of claims 1 to 3, It is characterized by comprising a distance control unit for controlling the robot arm so that the distance from the nozzle of the inkjet head to the object to be drawn becomes a target value.
  • the invention according to claim 5 is the drawing apparatus according to any one of claims 1 to 4,
  • the inkjet head has a plurality of nozzles arranged side by side, It is characterized by comprising a nozzle selection control section that regulates ejection of nozzles whose distance to the object to be drawn deviates from a target value.
  • the invention according to claim 6 is the drawing apparatus according to any one of claims 1 to 5, It is characterized by comprising an attitude control section for controlling the robot arm so that the inkjet head ejects ink in a direction facing the surface of the object to be drawn.
  • the invention according to claim 7 is the drawing apparatus according to any one of claims 1 to 6, It is characterized by comprising an adjusting mechanism for adjusting the tilt angle of the object to be drawn.
  • the invention according to claim 8 is the drawing apparatus according to any one of claims 1 to 7,
  • the pinning device is an irradiation device that irradiates the ejected ink with an energy beam.
  • the invention according to claim 9 is the drawing apparatus according to claim 8,
  • the pinning device is an irradiation device that irradiates the ejected ink with energy rays of infrared rays, ultraviolet rays, or excimer emission.
  • the invention according to claim 10 is the drawing apparatus according to any one of claims 1 to 7,
  • the pinning device is a heating device that heats the ejected ink.
  • the invention according to claim 11 is the drawing apparatus according to any one of claims 1 to 10, It is characterized by comprising a temperature adjusting section that adjusts the temperature of the ink before it is ejected from the inkjet head.
  • the invention according to claim 12 is the drawing apparatus according to any one of claims 1 to 11,
  • the ink is characterized by containing at least one of an ultraviolet curing agent, an ultraviolet absorber and a gelling agent.
  • the invention according to claim 13 is the drawing apparatus according to any one of claims 1 to 12,
  • the ink is characterized by having thixotropic properties such that the viscosity is 200 [mPa ⁇ s] or less at a shear rate of 1000 [1/s].
  • the invention according to claim 14 is the drawing apparatus according to claim 13, It is characterized by comprising a circulation structure that circulates the ink supplied to the nozzles of the inkjet head at a shear rate of 1000 [1/s] or more.
  • the invention according to claim 15 is the drawing apparatus according to claim 14,
  • the ink circulation amount of the circulation structure is 30 [ml/min] or more.
  • the invention according to claim 16 is the drawing apparatus according to any one of claims 1 to 15,
  • the robot arm holds the inkjet head and the pinning device together,
  • the pinning device performs control to increase the viscosity of the ink from the rear side of the inkjet head with respect to the traveling direction of the inkjet head.
  • First drawing control A part is provided.
  • the invention according to claim 17 is the drawing apparatus according to any one of claims 1 to 15, the robot arm holds two pinning devices on opposite sides of the inkjet head; When drawing is performed by scanning the inkjet head in one direction parallel to a predetermined scanning direction, from the pinning device behind the inkjet head with respect to the traveling direction of the inkjet head in the one direction thicken the ink, When drawing is performed by scanning the inkjet head in a direction opposite to the one direction parallel to the scanning direction, the ink jet head located behind the inkjet head with respect to the traveling direction of the inkjet head in the opposite direction. It is characterized by comprising a second drawing control section that controls to increase the viscosity of the ink from the pinning device.
  • the invention according to claim 18 is the drawing apparatus according to any one of claims 1 to 15,
  • the robot arm holds the two inkjet heads on both sides of the pinning device,
  • the ink is ejected from the inkjet head located in front of the pinning device with respect to the traveling direction of the inkjet head in the one direction.
  • the inkjet head is on the front side of the pinning device with respect to the traveling direction of the inkjet head in the opposite direction. It is characterized by comprising a third drawing control unit that controls to eject ink from the head.
  • Drawing is performed using the drawing apparatus according to claim 1.
  • the invention according to claim 20 is the drawing method according to claim 19, the ink comprises a gelling agent; A temperature difference is provided between the ink before it is ejected from the inkjet head and the object to be drawn, and gelling of the ink adhering to the object to be drawn is promoted.
  • the present invention can suppress the occurrence of dripping and perform good drawing.
  • FIG. 1 is a side view showing the overall configuration of a drawing apparatus that is an embodiment of the present invention
  • Front view of drawing device Bottom view of head unit Perspective view of inkjet head
  • Cross-sectional view of an inkjet head Disassembled perspective view of inkjet head
  • Disassembled perspective view of head chip Top view of pressure chamber substrate Bottom view of the pressure chamber substrate Plan view of channel spacer substrate
  • Bottom view of channel spacer substrate Plan view of nozzle substrate
  • FIG. 4 is a side view showing the relationship between the target position of ink ejection by the inkjet head and the near-infrared irradiation position of the pinning device; Block diagram showing the main functional configuration of the drawing device Explanatory drawing of the ejection control of the inkjet head by the nozzle selection control unit.
  • FIG. 1 is a side view showing the overall configuration of a drawing apparatus 300 according to an embodiment of the present invention
  • FIG. 2 is a front view (however, FIG. 2 shows a state in which a head unit 224, which will be described later, faces downward).
  • the drawing apparatus 300 includes a head unit 224 having a plurality of inkjet heads 100, a robot arm 310 that holds the head unit 224, a pinning device 320 that thickens the ink ejected from the inkjet heads 100, and each of these components. and a chamber 330 for storing a workpiece W (see FIGS. 14 and 16) as an object to be patterned, and a controller 240 for controlling the operation of each of the components described above.
  • the robot arm 310 includes a base 311 as a base, a plurality of arms 312 connected by joints 313, servo motors as drive sources provided for each joint, and arms rotated or rotated by each servo motor. It is a vertically articulated robot arm equipped with encoders for detecting angles, and an inkjet head 100 and a pinning device 320 are held at the tips of a plurality of arms 312 connected by joints 313 .
  • Each of the joints 313 is either a rocking joint that pivotally supports one end of the arm 312 and pivots the other end, or a rotary joint that pivotally supports the arm 312 itself so that it can rotate about its longitudinal direction.
  • the robot arm 310 has six joints 313, and can position the inkjet head 100 and the pinning device 320 at the tip of the arm 310 at arbitrary positions and take arbitrary postures. Therefore, the robot arm 310 can scan the head unit 224 along an arbitrary curved line on the three-dimensional curved surface of the work W to perform drawing. In the present embodiment, “scanning” means drawing while moving the head unit 224 .
  • the robot arm 310 is not limited to 6-axis, and a 7-axis arm having 7 joints may be adopted.
  • the inkjet head 100 and the pinning device 320 can be positioned at arbitrary positions, and the intermediate joints can be moved while taking arbitrary postures. Interference with other surrounding objects can be avoided. Therefore, the inkjet head 100 and the pinning device 320 can be positioned at arbitrary positions in a wider range and can be made to assume arbitrary postures.
  • the chamber 330 is a storage room that stores the robot arm 310 and the workpiece W in a sealed state.
  • a workbench 331 on which the work W is placed is provided inside the chamber 330 .
  • a jig for holding the workpiece W in a predetermined posture may be provided on the workbench 331 .
  • the inside of the chamber 330 can be blocked from the outside air to be dustproof and moistureproof.
  • FIG. 3 is a bottom view of the head unit 224 viewed from the ink ejection direction of the inkjet head 100.
  • the drawing width direction which is the arrangement direction of the nozzles 111 of the inkjet head 100, is defined as the left-right direction, and the direction of ejection from the nozzles 111 is perpendicular to the direction of ejection.
  • a direction orthogonal to the left-right direction is defined as a front-rear direction (also referred to as a scanning direction), and a direction orthogonal to the left-right direction and the front-rear direction (ejection direction) is defined as an up-down direction.
  • these front, back, left, right, up, and down directions are directions in which the head unit 224 is determined with respect to the inkjet head 100, and do not match the front, back, left, right, up, and down directions in the description of the robot arm 310 described above.
  • the arrows in the flow path of the inkjet head 100 indicate the direction of ink flow.
  • " ⁇ " is used to mean that the numerical values before and after it are included as the lower limit and the upper limit.
  • the head unit 224 is a unit formed by integrally holding a plurality of inkjet heads 100 with their ejection directions aligned. As shown in FIG. 3, the head unit 224 has two rows of ink jet heads 100 arranged in the horizontal direction in two rows. In the head unit 224, the inkjet heads 100 are staggered so that the nozzles 111 of the inkjet heads 100 in the front row and the nozzles 111 of the inkjet heads 100 in the rear row do not overlap when viewed from the front-rear direction. are placed. As a result, the head unit 224 constitutes a line head, and performs one-pass drawing with lines extending in the left-right direction. Note that the number of rows and columns of the inkjet heads 100 is an example, and is not limited to the above description.
  • FIG. 6 shows the head chip 1
  • FIGS. 7A and 7B show the pressure chamber substrate 13
  • FIGS. 8A and 8B show the channel spacer substrate 12
  • FIG. 10A, 10B, 11A and 11B show the head chip 1.
  • FIG. 7B is described as a bottom view of the pressure chamber substrate 13, strictly speaking, it is not a bottom view, but a view of the bottom surface of the pressure chamber substrate 13 seen through from above.
  • FIG. 8B is not strictly a bottom view, but is a view of the bottom face of the channel spacer substrate 12 seen through from above.
  • the ink jet head 100 includes a head chip 1, a wiring board 2 on which the head chip 1 is arranged, and a wiring board 2 and a flexible board 3 which are connected to each other.
  • a drive circuit board 4 a manifold 5 for storing ink to be supplied to the pressure chambers 131 in the head chip 1, a housing 6 in which the manifold 5 is accommodated, and a bottom opening of the housing 6 are attached so as to close the opening.
  • a cap receiving plate 7 mounted on the housing 6, a cover member 9 attached to the housing 6, and the like are provided.
  • illustration of the manifold 5 is omitted in FIG. 4A, and illustration of the cover member 9 is omitted in FIGS. 4B and 5 .
  • an example in which the number of rows of the nozzles 111 of the head chip 1 is four will be described. may be any one of 1 to 3 columns, or may be 5 or more columns.
  • the head chip 1 is a substantially square prism-shaped member elongated in the left-right direction, and is constructed by laminating a pressure chamber substrate 13, a channel spacer substrate 12, and a nozzle substrate 11 in order (FIGS. 6 to 8). 11B).
  • the pressure chamber substrate 13 is provided with pressure chambers 131, air chambers 132, a common ink discharge path 133, and the like (see FIGS. 6, 7A, 7B, etc.).
  • a large number of pressure chambers 131 and air chambers 132 are provided so as to be alternately arranged in the left-right direction, and are provided in four rows in the front-rear direction.
  • the pressure chamber 131 has a substantially rectangular cross section and is formed along the vertical direction, and has an inlet on the upper surface of the pressure chamber substrate 13 and an outlet on the lower surface.
  • the pressure chamber 131 communicates with the ink reservoir 51 at its upper end, and ink is supplied from the ink reservoir 51 to the pressure chamber 131 and ejected from the nozzle 111 into the pressure chamber 131 .
  • the pressure chamber 131 is formed along the vertical direction so as to have a substantially rectangular cross section with the same area, straddling the pressure chamber substrate 13 and the channel spacer substrate 12. It communicates with the nozzle 111 (see FIGS. 10A, 10B, etc.).
  • the air chamber 132 has a substantially rectangular cross section slightly larger than the pressure chamber 131 and is formed parallel to the pressure chamber 131 along the vertical direction. Also, unlike the pressure chamber 131 , the air chamber 132 is not communicated with the ink reservoir 51 , so that ink does not flow into the air chamber 132 . Also, the air chamber 132 is not communicated with the nozzle 111 (see FIGS. 10A, 10B, etc.).
  • the pressure chamber 131 and the air chamber 132 are separated by a partition wall 136 as a pressure generating means made of piezoelectric material (see FIG. 11A).
  • a drive electrode (not shown) is provided on the partition 136, and the partition 136 and the drive electrode constitute an actuator.
  • the partition wall 136 portion between the adjacent pressure chambers 131 repeats shear mode displacement, thereby applying pressure to the ink in the pressure chambers 131 .
  • the pressure chambers 131 located at the ends in the left-right direction, which have partition walls 136 only on one side, are not used, and the other pressure chambers 131 have partition walls 136 on both sides.
  • a pressure chamber 131 is used.
  • meniscus oscillation Meniscus rocking continuously reciprocates the volume of the pressure chamber 131 within a certain range based on the rocking waveform, and without ejecting ink, the meniscus (bent interface) formed by the ink in the nozzle 111 and the nozzle 111 . Among them, the ink in the pressure chamber 131 is vibrated.
  • the “fluctuation waveform” is a drive pulse weaker than the contraction pulse for ejecting droplets, and is a contraction or expansion pulse that contracts or expands the volume of the pressure chamber within a range where only pressure waves are generated.
  • the actuator (partition wall 136, drive electrode, etc.) that applies pressure to the ink in the pressure chamber 131 has a lower voltage than the drive waveform for ejecting the ink from the nozzle 111, and the pressure of the ink in the pressure chamber 131 is reduced.
  • a rocking waveform is applied to oscillate the interface.
  • the pressure chambers 131 may be formed without the air chambers 132, it is preferable to alternately provide the pressure chambers 131 and the air chambers 132 as described above. As a result, the pressure chambers 131 can be prevented from being adjacent to each other, so that when the partition wall 136 adjacent to one pressure chamber 131 is deformed, the other pressure chambers 131 are not affected.
  • the common ink discharge path 133 is configured by connecting a first common ink discharge path 134 and a second common ink discharge path 135 (see FIGS. 6 and 7B, etc.).
  • the first common ink discharge path 134 is formed on the lower surface side of the pressure chamber substrate 13 so as to avoid the portion where the pressure chambers 131 and the air chambers 132 are provided, and extends on the front and rear sides of the head chip 1 and their central portions. , are provided along the left-right direction in three rows.
  • a plurality of individual ink discharge paths 121 provided on the channel spacer substrate 12 are connected to the lower surface side of the first common ink discharge path 134, and these individual ink discharge paths 121 (second individual ink discharge paths 123 ) can merge in the first common ink discharge path 134 (FIGS. 7B, 8A and 10A).
  • the first common ink discharge path 134 is connected near the right end to a second common ink discharge path 135 capable of discharging ink to the outside of the head chip 1 . Therefore, the first common ink discharge path 134 serves as a flow path through which the ink flowing from the individual ink discharge path 121 (the second individual ink discharge path 123) flows toward the second common ink discharge path 135. .
  • the second common ink discharge path 135 is formed along the vertical direction, like the pressure chambers 131 .
  • the second common ink discharge path 135 communicates with the first common ink discharge path 134 on the lower surface side of the pressure chamber substrate 13, and communicates with the discharge liquid chamber 57 on the upper surface side of the pressure chamber substrate 13. It is a flow path for discharging the ink flowing from 134 toward the upper side (the side opposite to the nozzle substrate 11 side) to the outside of the head chip 1 .
  • the second common ink discharge path 135 is provided near the right end of the head chip 1 and communicates with the first common ink discharge path 134 . Further, by providing the second common ink discharge path 135 so as to have a volume larger than that of the individual pressure chambers 131, the ink discharge efficiency can be improved.
  • Pressure chambers 131 and individual ink discharge paths 121 branched from the pressure chambers 131 are formed in the channel spacer substrate 12 (see FIGS. 10A and 10B, etc.).
  • the pressure chambers 131 are formed along the vertical direction so as to straddle the channel spacer substrate 12 and the pressure chamber substrate 13 and have substantially rectangular cross sections with the same area.
  • One end of the individual ink discharge path 121 is connected to the pressure chamber 131 and the other end is connected to the first common ink discharge path 134 to discharge the ink in the pressure chamber 131 to the first common ink discharge path 134 . It is a flow channel.
  • Two or more individual ink discharge paths 121 are provided with respect to the ejection opening of the nozzle 111 from the viewpoint of facilitating the discharge of air bubbles, foreign substances, etc. together with the ink. That is, at least two individual ink discharge paths 121 are provided in each pressure chamber 131 . Also, as shown in FIGS.
  • two individual ink discharge paths 121 are provided one each in the forward direction and the rearward direction of the pressure chamber 131 to discharge air bubbles, foreign matters, etc. together with the ink. It is preferable because it is possible to obtain the effect of facilitating production and the production efficiency is high.
  • the flow path spacer substrate 12 is made of silicone, stainless steel, etc., from the viewpoints that the individual ink discharge paths 121 can be easily processed (with high precision) and that the temperature of the ink can be easily kept uniform due to its high thermal conductivity.
  • a substrate made of steel (SUS) or 42 alloy is preferred. Among these, it is preferable to use a substrate made of a material having a coefficient of thermal expansion close to that of the material forming the pressure chamber substrate 13 .
  • the nozzle substrate 11 is provided with a nozzle 111 which is a hole penetrating in the thickness direction (vertical direction) (see FIG. 9).
  • the nozzle 111 communicates with the pressure chamber 131 and serves as an ejection opening (ejection opening) for ejecting the ink stored in the pressure chamber 131 when pressure is applied to the ink in the pressure chamber 131 .
  • the nozzles 111 in this embodiment are arranged in the horizontal direction and form four rows in the front-rear direction.
  • the nozzle substrate 11 preferably constitutes one of the channel walls of the first individual ink discharge channel 122 .
  • the nozzle substrate 11 since the nozzle substrate 11 is thin, it can function as a damper capable of changing the volume of the flow path by slightly elastically deforming due to pressure.
  • the nozzle substrate 11 is preferably made of polyimide resin, polyethylene terephthalate resin, polyamide resin, polysulfone resin, or the like. Accordingly, the nozzle substrate 11 can be manufactured by processing the resin substrate with high accuracy by laser processing, and the nozzle substrate 11 has excellent ink resistance, which is preferable. Moreover, since these resin substrates have high elasticity, they can be suitably used as the channel walls of the first individual ink supply channels. The nozzle substrate 11 can also be manufactured by etching a silicone substrate.
  • a protective film having ink resistance is formed on the flow path surfaces of the pressure chambers 131, the individual ink discharge paths 121, and the common ink discharge path 133, which serve as ink flow paths in the head chip 1.
  • the protective film is not particularly limited as long as it has ink resistance.
  • the parylene film is a resin film made of a paraxylylene resin or a derivative resin thereof, and may be formed, for example, by a chemical vapor deposition (CVD) method using a solid di-paraxylylene dimer or a derivative thereof as a vapor deposition source. can be done. That is, the para-xylylene radicals generated by the vaporization and thermal decomposition of the di-para-xylylene dimer are adsorbed on the surface of the flow channel member and the metal layer, undergo a polymerization reaction, and form a film.
  • CVD chemical vapor deposition
  • Parylene films include parylene films having various performances, and depending on the required performance, various parylene films and multi-layered parylene films in which a plurality of these various parylene films are laminated are used as desired parylene films. can also be applied.
  • the layer thickness of the parylene film is preferably in the range of 5 to 20 ⁇ m from the viewpoint of obtaining excellent insulation and ink resistance effects.
  • Poly-para-xylylene is a crystalline polymer with a molecular weight as high as 500,000, and the raw material para-xylylene dimer is sublimated and thermally decomposed to generate para-xylylene radicals.
  • Para-xylylene radicals attach to the spacer substrate and simultaneously polymerize to form poly-para-xylylene to form a protective film.
  • polyparaxylylene examples include Parylene N (trade name of Japan Parylene Co., Ltd.).
  • polyparaxylylene derivatives include Parylene C (trade name of Nippon Parylene Co., Ltd.) in which one chlorine atom is substituted on the benzene ring, and Parylene D (Nippon Parylene (trade name, manufactured by Nippon Parylene Co., Ltd.), and Parylene HT (trade name, manufactured by Japan Parylene Co., Ltd.) in which hydrogen atoms of methylene groups connecting benzene rings are substituted with fluorine atoms.
  • parylene N or parylene C is used as the polyparaxylylene and the polyparaxylylene derivative of the present embodiment from the viewpoint of obtaining the effects of excellent insulation and ink resistance with the above-described layer thickness. is preferred.
  • the first individual ink discharge path 122 in this embodiment is provided on the lower surface side portion of the flow path spacer substrate 12, it is not limited to this.
  • the first individual ink discharge path 122 may be provided across both the nozzle substrate 11 and the flow path spacer substrate 12, may be provided only on the nozzle substrate 11, or may be provided on the bottom surface of the flow path spacer substrate 12. It may be provided slightly above the nozzle substrate 11 so as not to be adjacent to the nozzle substrate 11 .
  • a wiring board 2 is arranged on the upper surface of the head chip 1, and two flexible boards 3 connected to a driving circuit board 4 are provided on both edges of the wiring board 2 along the front-rear direction. are arranged.
  • the wiring board 2 is formed in a substantially rectangular plate shape elongated in the left-right direction, and has an opening 22 in its substantially central portion.
  • the widths of the wiring board 2 in the left-right direction and the width in the front-rear direction are formed to be larger than those of the head chip 1 .
  • the opening 22 is formed in a substantially rectangular shape elongated in the left-right direction.
  • the outlet of the ink discharge path 135 is exposed upward.
  • the flexible board 3 electrically connects the driving circuit board 4 and the electrode part of the wiring board 2, and the signal from the driving circuit board 4 is provided to the partition wall 136 in the head chip 1 through the flexible board 3. can be applied to the drive electrodes.
  • the lower end of the manifold 5 is attached and fixed to the outer edge of the wiring board 2 by adhesion. That is, the manifold 5 is arranged on the inlet side (upper side) of the pressure chamber 131 of the head chip 1 and connected to the head chip 1 via the wiring substrate 2 .
  • the manifold 5 is a member molded from resin, is provided above the pressure chambers 131 of the head chip 1, and stores ink introduced into the pressure chambers 131.
  • the manifold 5 is elongated in the left-right direction, and includes a hollow main body portion 52 that forms an ink reservoir 51 and a hollow main body portion 52 that forms an ink flow path. 1st to 4th ink ports 53 to 56 are provided.
  • the ink reservoir 51 is divided into two chambers, a first liquid chamber 51a on the upper side and a second liquid chamber 51b on the lower side, by a filter F for removing dust in the ink.
  • the first ink port 53 communicates with the upper right end of the first liquid chamber 51 a and is used to introduce ink into the ink reservoir 51 .
  • a first joint 81a is externally inserted at the tip of the first ink port 53.
  • the second ink port 54 communicates with the upper left end of the first liquid chamber 51a and is used to remove air bubbles in the first liquid chamber 51a.
  • a second joint 81b is externally fitted to the tip of the second ink port 54.
  • the third ink port 55 communicates with the upper left end of the second liquid chamber 51b and is used to remove air bubbles in the second liquid chamber 51b.
  • a third joint 82 a is externally inserted at the tip of the third ink port 55 .
  • the fourth ink port 56 communicates with a discharge liquid chamber 57 that communicates with the second common ink discharge path 135 of the head chip 1, and the ink discharged from the head chip 1 passes through the fourth ink port 56 to the inkjet printer. It is discharged outside the head 100 .
  • the housing 6 is, for example, a member formed by die casting using aluminum as a material, and is elongated in the left-right direction.
  • the housing 6 is formed so as to accommodate the manifold 5 to which the head chip 1, the wiring substrate 2 and the flexible substrate 3 are attached, and the bottom of the housing 6 is open.
  • Mounting holes 68 for mounting the housing 6 to the main body of the printer are formed at both ends of the housing 6 in the left-right direction.
  • the cap receiving plate 7 has an elongated nozzle opening 71 formed in a substantially central portion thereof in the left-right direction. It is installed so as to close the bottom opening.
  • FIG. 12 is a schematic diagram showing the ink circulation device 8.
  • the inkjet head 100 is also provided with an ink circulation device 8 as a circulation structure that is particularly suitable for using thixotropic ink that has a low viscosity immediately before ejection and a high viscosity after ejection.
  • the ink circulation device 8 can circulate ink through the first common ink discharge path 134 and the second common ink discharge path 135 to the ejection openings of the nozzles 111 .
  • the ink circulation device 8 controls the average shear velocity in the flow path communicating with the nozzles in the pressure chamber to be 1000 [1/s] or more and 10000 [1/s] or less.
  • the average shear rate refers to the average shear rate during circulation, not during discharge.
  • the “channel communicating with the nozzle” refers to the channel in the vicinity of the nozzle in the pressure chamber 131, as indicated by symbol R in FIG. 10A.
  • the “channel near the nozzle” refers to the channel configured by the channel components closest to the nozzle, specifically the channel R configured by the channel spacer substrate 12 .
  • the ink circulation device 8 controls the average shear rate in the flow path communicating with the nozzle 111 to be the shear rate set in the range of 1000 to 10000 [1/s].
  • means for controlling the average shear rate within the above range include, for example, controlling the circulating flow rate Q of all the nozzles.
  • the circulation flow rate Q can be calculated by the following formula, in order to control the circulation flow rate Q, the first and fourth ink ports 53 and 56 (Fig. 12) (the differential pressure between the INLET and the OUTLET of the head).
  • control unit 240 controls the pressure applied to the pump 88 of the ink circulation device 8, the amount of ink filled in each of the sub-tanks 81 and 82, and the vertical (gravitational) position of each of the sub-tanks 81 and 82. are appropriately changed to adjust the pressure P1 and the pressure P2, and the ink flow rate (circulation flow rate Q) communicating with the nozzles is controlled by the pressure difference (circulation differential pressure ⁇ P) between the pressures P1 and P2.
  • Circulation flow rate Q Circulation differential pressure ⁇ P / Head channel resistance R (The circulating differential pressure ⁇ P represents the circulating differential pressure in the first and fourth ink ports 53 and 56. The head flow path resistance is the flow path resistance from the fourth ink port 56 to the first ink port 53. show)
  • the ink circulation device 8 is an ink supply means for generating a circulation flow of ink from the pressure chambers 131 in the inkjet head 100 to the individual ink discharge paths 121 .
  • the ink circulation device 8 is composed of a supply sub-tank 81, a circulation sub-tank 82, a main tank 83, and the like (see FIG. 12).
  • the supply sub-tank 81 is filled with ink to be supplied to the ink reservoir 51 of the manifold 5 and is connected to the first ink port 53 by an ink flow path 84 .
  • the circulation sub-tank 82 is filled with the ink discharged from the discharge liquid chamber 57 of the manifold 5 and is connected to the fourth ink port 56 by the ink channel 85 .
  • the supply sub-tank 81 and the circulation sub-tank 82 are provided at different positions in the vertical direction (gravitational direction) with respect to the nozzle surface of the head chip 1 (hereinafter also referred to as the "position reference plane").
  • a pressure P1 due to a water head difference between the position reference plane and the supply sub-tank 81 and a pressure P2 due to a water head difference between the position reference plane and the circulation sub-tank 82 are generated.
  • the supply sub-tank 81 and the circulation sub-tank 82 are connected by an ink flow path 86 . Then, the pressure applied by the pump 88 can return the ink from the circulation sub-tank 82 to the supply sub-tank 81 .
  • the main tank 83 is filled with ink to be supplied to the supply sub-tank 81 and is connected to the supply sub-tank 81 by an ink flow path 87 . Ink can be supplied from the main tank 83 to the supply sub-tank 81 by the pressure applied by the pump 89 .
  • the pressure P1 and the pressure P2 can be adjusted by appropriately changing the amount of ink filled in each sub-tank and the position of each sub-tank in the vertical direction (the direction of gravity).
  • the pressure difference between the pressures P1 and P2 allows the ink in the inkjet head 100 to circulate at an appropriate circulation flow rate.
  • the control unit 240 controls the pressure difference between the pressure P1 and the pressure P2 so that the ink circulation rate is 30 [ml/min] or more and 300 [ml/min] or less.
  • the ink circulation device 8 As an example of the ink circulation device 8, the method of controlling the circulation of ink by using the difference in water head has been described, but it is naturally possible to make appropriate modifications as long as the configuration is capable of generating a circulating flow of ink.
  • the head unit 224 may be provided with a temperature adjustment device 226 as a temperature adjustment section that heats and adjusts the temperature of the ink before ejection supplied to the nozzles 111 (see FIG. 15).
  • the temperature adjustment device 226 has a temperature controllable heater and a temperature detection element.
  • the heater is provided at a position that can heat the ink in the ink flow path or tank on the upstream side of the nozzle 111 .
  • the temperature detection element is provided near the heater or nearer the nozzle 111 than the heater, and detects the temperature of the ink supplied to the nozzle 111 .
  • the output of the heater is controlled by the controller 240 so that the temperature of the ink reaches a predetermined temperature based on the detection of the temperature detection element. As a result, the ink immediately before being ejected from the nozzles 111 can be adjusted to the appropriate target temperature.
  • FIG. 13 is a perspective view of the pinning device 320.
  • the pinning device 320 is held at the tip of the robot arm 310 together with the head unit 224 and consists of an irradiation device that irradiates ink ejected from the inkjet head 100 with energy rays.
  • the pinning device 320 is arranged at the tip of the robot arm 310 on the front side of the head unit 224 (the “front side” in the inkjet head 100 described with reference to FIG. 3).
  • the pinning device 320 irradiates the ink with energy rays such as infrared light (especially, near-infrared light: wavelength of about 0.7 to 2.5 [ ⁇ m]), ultraviolet light (wavelength of about 10 to 400 [nm]), and excimer emission.
  • energy rays such as infrared light (especially, near-infrared light: wavelength of about 0.7 to 2.5 [ ⁇ m]), ultraviolet light (wavelength of about 10 to 400 [nm]), and excimer emission.
  • energy rays such as infrared light (especially, near-infrared light: wavelength of about 0.7 to 2.5 [ ⁇ m]), ultraviolet light (wavelength of about 10 to 400 [nm]), and excimer emission.
  • a pinning device 320 that emits near-infrared rays is exemplified.
  • the pinning device 320 includes a plurality of LEDs (light emitting diodes) 321 that emit near-infrared light, a light collecting plate 322 that collects the near-infrared light from each LED 321 at a predetermined irradiation position, and a light emitting circuit (not shown) of each LED 321. , which are integrally unitized by a housing and held at the tip of the robot arm 310 together with the head unit 224 .
  • LEDs light emitting diodes
  • FIG. 14 is a side view showing the relationship between the target position of ink ejection by the inkjet head 100 of the head unit 224 and the irradiation position of the near-infrared rays by the light collecting plate 322 of the pinning device 320.
  • FIG. This figure shows the state of the inkjet head 100 viewed from the left-right direction.
  • the appropriate ejection distance d from the nozzle surface of the inkjet head 100 to the target ejection position is determined to be a constant value based on the design conditions due to the principle restrictions of the ejection operation. .
  • ejection is performed with a target ejection position P set to a position that is the ejection distance d ahead of each nozzle 111 .
  • the light-condensing plate 322 of the pinning device 320 can irradiate a range that can include all the ejection positions P that are the ejection distance d forward from all the nozzles 111 of the plurality of inkjet heads 100 of the head unit 224 and their surroundings.
  • the irradiation direction and the light collection range are adjusted as follows.
  • an ultraviolet lamp or an ultraviolet LED is mounted as a light source, and when excimer light emission is emitted, an excimer lamp is mounted as a light source. Also in these cases, it is preferable to provide a condensing plate for condensing light onto the ejection positions P of all the nozzles 111 of the inkjet head 100 .
  • the pinning device 320 irradiates the energy beams so as to include the ejection positions P of the ink ejected from all the nozzles 111 of the head unit 224, so that the energy rays are ejected and attached to the surface of the work W, which is the object to be drawn.
  • the pinning device 320 is not limited to various energy beam irradiation devices, and may be a heating device that heats the ejected ink.
  • the heating device preferably includes a heater element serving as a heat source for heating the ink, and blowing means such as a fan for blowing high-temperature air heated by the heater element to the ink adhesion position.
  • blowing means such as a fan for blowing high-temperature air heated by the heater element to the ink adhesion position.
  • high-temperature air can be intensively applied to the ink adhering to the surface of the work W, and the ink can be effectively fixed by rapid drying.
  • the drawing apparatus 300 may be configured to include a distance measuring device 225 at the tip of the robot arm 310 together with the head unit 224 and the pinning device 320 .
  • the distance measurement device 225 is a detection device that detects the distance from each nozzle 111 of the head unit 224 to the surface of the workpiece W in front, for example, a two-dimensional or three-dimensional measurement device such as LiDAR (Laser Imaging Detection and Ranging). be.
  • LiDAR Laser Imaging Detection and Ranging
  • the robot arm 310 can be controlled so that the distance from each nozzle 111 to the front surface of the workpiece W is maintained at the above-described appropriate discharge distance d.
  • the distance measuring device 225 is not an essential component in the rendering device 300 .
  • each nozzle 111 outputs the workpiece W based on the surface position coordinates of the workpiece W.
  • the distance measuring device 225 can be made unnecessary by controlling the distance to the surface of the work W so as to maintain an appropriate ejection distance d.
  • the coordinates of the surface of the work W developed in the coordinate system of the robot arm 310 and the distance of the surface of the work W detected by the distance measuring device 225 are collated, and both are used to control the robot arm 310. good too.
  • the ink used in the inkjet head 100 is not particularly limited as long as it can be ejected from the inkjet head, but from the viewpoint of obtaining stable ejection characteristics, the viscosity (25° C.) at a shear rate of 1000 [1/s] should be 200 mPa ⁇ s or less. It is preferable that the ink has a thixotropic property. Furthermore, from the viewpoint of good injection properties, the viscosity at a shear rate of 1000 [1/s] is more preferably 2 to 100 mPa ⁇ s, and even more preferably 5 to 15 mPa ⁇ s.
  • the viscosity of the ink at a shear rate of 100 [1/s] is greater than the viscosity at a shear rate of 1000 [1/s], and the viscosity at a shear rate of 10 [1/s] is 100 [1/s]. It is preferable that the viscosity is greater than the viscosity at the time of s] because it has thixotropic properties, and the thixotropic properties increase the viscosity after ejection, thereby preventing liquid dripping.
  • the ink preferably contains an aqueous solvent (water-soluble solvent, water), a pigment and a fixing resin, and more preferably contains a thixotropic agent.
  • the ink contains a pigment in the range of 3 to 10% by mass, a fixing resin in the range of 8 to 20% by mass, and a water-soluble solvent in the range of 10 to 30% by mass, and It is preferable that water is contained within the range of 40 to 79% by mass.
  • the ink according to the present invention preferably has a solid content of 6 to 30% by mass.
  • “Ink solids” refers to solid components that cannot be removed from the ink by drying at 100°C.
  • the solid content of the ink is, for example, components other than the solvent including the aqueous solvent.
  • the ink may contain any component that does not impair the above-described properties relating to thixotropy, in addition to the aqueous solvent, pigment, fixing resin, and thixotropy-imparting agent.
  • optional components include pigment dispersants and surfactants. Each component in the thixotropic ink will be described below.
  • the thixotropy-imparting agent is not particularly limited as long as it is a material capable of imparting thixotropy that satisfies the conditions of the viscosity characteristics described above.
  • the thixotropy-imparting agent preferably has a particle shape (however, the particle shape includes a fiber shape), and more preferably has an aspect ratio of 20 or more.
  • the shape is preferably elliptical, scale-like, plate-like, needle-like, fiber-like, or the like.
  • the aspect ratio indicating the ratio of the major axis to the minor axis of the thixotropic agent is preferably 20 or more. When the aspect ratio is 20 or more, it is easier to impart thixotropy to the ink.
  • the long diameter of the thixotropy-imparting agent is preferably 2 ⁇ m or less. If the major axis of the thixotropy-imparting agent exceeds 2 ⁇ m, it may affect the ink-jet dischargeability.
  • the cross section for measuring the aspect ratio of the thixotropy-imparting agent is a cross section parallel to the length direction of the particle and cut in the thickness direction.
  • the aspect ratio is a value determined from the average major particle diameter and average minor diameter of 50 particles obtained from the cross section.
  • the short axis is the thickness of the particle
  • the long axis is the long side of the cross section perpendicular to the thickness direction of the particle, in other words, when the particle is viewed from above.
  • the major axis is the length of the particle
  • the minor axis is the major axis or maximum width of the cross section perpendicular to the length direction of the particle, in other words, when the particle is viewed from above. be.
  • Materials for the thixotropic agent include polysaccharides and inorganic particles.
  • polysaccharides include cellulose, chitin, chitosan, xanthan gum, welan gum, succinoglycan, guar gum, locust bean gum and derivatives thereof, glycomannan, agar, and carrageenan.
  • the derivatives include cellulose derivatives such as methyl cellulose, hydroxyethyl cellulose, and carboxymethyl cellulose.
  • polysaccharides natural polysaccharides with a weight average molecular weight of about several million are preferable. Specifically, xanthan gum, guar gum, carrageenan, and the like are preferred.
  • polysaccharides such as shells of crustaceans such as trees, crabs, and shrimps are subjected to oxidation treatment using a catalyst, mechanical treatment using a grinder, and the like.
  • Polysaccharide nanofibers are preferably used, which are finely pulverized by dissolving the fibers extremely finely.
  • the polysaccharide in the polysaccharide nanofiber is preferably at least one of cellulose, chitin and chitosan, and more preferably cellulose.
  • nanofibers refer to those having a width of about 1 to 100 nm and an aspect ratio of 100 or more.
  • the length and width of nanofibers can be measured, for example, using electron microscopy.
  • the width of the nanofiber may be measured, for example, as the width in plan view, or as the diameter of the cross section perpendicular to the longitudinal direction of the nanofiber.
  • the "width" of the nanofiber is the average of the maximum widths of each nanofiber in the 50 nanofibers.
  • the "length" of a nanofiber is the average length of 50 nanofibers.
  • the aspect ratio of a nanofiber is determined as the length divided by the width.
  • nanofibers with a smaller size are preferred.
  • the width of the nanofibers is preferably 1-50 nm, more preferably 1-5 nm.
  • the length of the nanofiber is preferably 0.5 to 2 ⁇ m, more preferably 0.5 to 1 ⁇ m, but is not limited thereto.
  • the aspect ratio of the nanofibers is more preferably in the range of 20-400, more preferably in the range of 100-300.
  • polysaccharides such as cellulose, chitin, and chitosan exist in a state in which structural units called microfibrils are bound together. These microfibrils have a width of 3 to 4 nm and a length of several ⁇ m (for example, 2 to 5 ⁇ m), but it is difficult to untie them one by one. In the case of mechanical crushing of polysaccharide aggregates, nanofibers with a width of about 20 to 50 nm are obtained in many conventional methods.
  • such nanofibers may be used as the polysaccharide nanofibers, but it is more preferable to use TEMPO-oxidized nanofibers that have been broken into finer, for example, microfibril units by TEMPO oxidation.
  • TEMPO oxidation is an oxidation reaction catalyzed by 2,2,6,6-tetramethyl-1-piperidine-oxy radical (TEMPO). Oxidation of polysaccharide aggregates in the presence of TEMPO yields extremely fine nanofibers corresponding to microfibrils, for example, 3-4 nm wide and several ⁇ m long (eg, 2-5 ⁇ m). .
  • the cellulose nanofiber used as a thixotropic agent is cellulose nanofiber.
  • Examples of forms of nanofiber cellulose include powdered cellulose and microcrystalline cellulose.
  • Cellulose nanofibers include Rheocrysta (registered trademark) manufactured by Daiichi Kogyo Seiyaku Co., Ltd., TEMPO oxidized cellulose nanofiber manufactured by Nippon Paper Industries Co., Ltd., Celenpia TC-01A, Celenpia TC-02X ("Celempia” is a registered trademark), and Sugino Machine.
  • IMa-10002, BMa-10002, WMa-10002, AMa-10002, FMa-10002 manufactured by Co., Ltd., ELEX- ⁇ , ELEX-S manufactured by Daio Paper Co., Ltd., Auro Visco manufactured by Oji Paper Co., etc. can be suitably used. .
  • the inorganic particles are not limited as long as they are particles having a material and a shape that can impart thixotropy to the ink that satisfies the conditions described above regarding thixotropy, but particles of various natural or synthetic clay minerals are preferable.
  • a smectite clay mineral is preferable as the clay mineral.
  • Smectite clay minerals are classified in the phyllosilicate class of layered silicate minerals or bentonite group minerals.
  • Smectite clay minerals are classified into the montmorillonite subgroup and the saponite subgroup according to their layered structure.
  • the montmorillonite subgroup includes montmorillonite, nontronite or beidellite.
  • the saponite subgroup includes hectorite, saponite or sauconite.
  • the smectite clay mineral may be either natural or synthetic.
  • a smectite clay mineral is a layered substance in which plate-like bodies are laminated, and when used as a thixotropy-imparting agent, it is usually used as plate-like particles separated between layers.
  • Synthetic smectite clay minerals have a smaller aspect ratio and less impurity content than natural ones.
  • the plate-like particles of the smectite clay mineral preferably have a thickness in the range of 0.2 to 3.0 nm and a length in the range of 10 to 150 nm. More preferably, the platelet-like particles have a thickness in the range of 0.2-2.0 nm and a length in the range of 10-125 nm.
  • the aspect ratio is a value obtained by dividing the length of the plate-like particles by the thickness, and is preferably 20 or more. More preferably, the aspect ratio is in the range of 20-200.
  • the length and thickness of plate-like particles can be measured, for example, using an electron microscope.
  • the thickness of the plate-like particles is, for example, the average value of 50 thicknesses of the plate-like particles measured on a given cross section.
  • the “length” of the plate-like particles is the average value of 50 lengths measured as the maximum diameter when the plate-like particles are viewed in plan.
  • the aspect ratio of plate-like particles is determined as a value obtained by dividing the length by the thickness.
  • Laponite manufactured by Big Chemie
  • Big Chemie which is a synthetic layered silicate
  • Laponite is a synthetic low charge clay that is close in structure and chemical composition to the natural smectite clay mineral hectorite.
  • the main particles of Laponite are disc-shaped with a maximum diameter of 30 nm and a thickness of 1 nm.
  • a commercially available product may be used as the smectite clay mineral.
  • Examples of commercially available products include Laponite RD (manufactured by Big Chemie), Kunipia F and Kunipia G, which are purified bentonites manufactured by Kunimie Kogyo Co., Ltd., and the like.
  • alumina nanofibers manufactured by Kawaken Fine Chemicals Co., Ltd. (with a short diameter of 4 nm and a long diameter of 1400 nm), which are nanofibers, may be used.
  • the content of the thixotropy-imparting agent in the ink according to the present embodiment is preferably in the range of 0.01 to 1% by mass with respect to the total amount of the ink, and is in the range of 0.08 to 0.5% by mass. It is more preferable to have
  • the thixotropy-imparting agents may be used singly or in combination of two or more.
  • the thixotropy-imparting agent is preferably composed of two or more materials.
  • one of the two or more materials is preferably a smectite clay mineral.
  • Preferred combinations of thixotropic agents include a combination of cellulose nanofibers and smectite clay minerals, and a combination of xanthan gum and smectite clay minerals. A combination of cellulose nanofibers and smectite clay minerals is particularly preferred.
  • Cellulose nanofibers and smectite clay minerals even when used alone, form a specific gel structure at an ink drying rate of 20%, for example, to impart elastic properties to the ink. It is considered possible. Moreover, by using a combination of cellulose nanofibers and smectite clay minerals, the above elastic properties are further enhanced, which is preferable.
  • the ratio of the smectite clay mineral and the other thixotropic agent can be selected according to the ink viscosity and the thixotropic property. It can be adjusted in a range of 10. By combining them, the thixotropy of the ink is greatly improved and the image quality is improved as compared with the addition of each of them alone. The reason why the thixotropy is improved is presumed, but it is conceivable that the smectite clay mineral has an electric charge, and the smectite clay mineral and other thixotropy-imparting agents are electrically associated to form a structure.
  • pigment Conventionally known organic and inorganic pigments can be used as the pigment contained in the ink according to the present invention.
  • the ink according to this embodiment optionally contains a pigment dispersant to disperse the pigment.
  • the pigment dispersant is not particularly limited, but a polymer dispersant having an anionic group is preferable, and one having a number average molecular weight within the range of 5,000 to 200,000 can be suitably used.
  • the ink according to this embodiment contains an aqueous solvent.
  • the aqueous solvent contains water as an essential solvent, and preferably optionally contains a known water-soluble solvent for viscosity adjustment and the like.
  • the ink according to this embodiment optionally contains a fixing resin.
  • the fixing resin functions as a binder for the pigment, which is the colorant, to improve the adhesion of the coating film to the object to be drawn, and to improve the abrasion resistance of the coating film obtained using the ink.
  • the fixing resin is preferably a water-insoluble resin.
  • the water-insoluble resin as the fixing resin is preferably used in the form of fine particles dispersed in an aqueous solvent.
  • the ink can optionally contain surfactants. As a result, it is possible to improve the ejection stability of the ink and to control the spread (dot diameter) of droplets that have landed on the object to be drawn.
  • Surfactants can be used without any particular limitation as long as they do not impair the effects of the present invention.
  • the above-described inks may contain, as necessary, in accordance with the purpose of improving emission stability, storage stability, image storage stability, and other various performances within a range that does not impair the effects of the present invention.
  • Various known additives such as viscosity modifiers, resistivity modifiers, film-forming agents, ultraviolet absorbers, antioxidants, anti-fading agents, anti-mold agents, anti-rust agents, etc. can be appropriately selected and used. .
  • the ink is prepared by mixing each of the above components so that the content is the above.
  • the pigment is dispersed in a portion of the aqueous solvent with a pigment dispersant and mixed with other components as a dispersion.
  • the fixing resin is preferably mixed with other components as a dispersion in a portion of the aqueous solvent using a surfactant added as necessary.
  • the ink may contain a gelling agent.
  • Ink containing a gelling agent is described in detail in paragraphs 0027 to 0055 of International Publication WO2021/001937A1, which can be applied.
  • the ink may contain an ultraviolet curing agent.
  • Ink containing an ultraviolet curing agent is described in detail in paragraphs 0067 to 0129 of JP-A-2020-172043, and this can be applied.
  • Ink containing an ultraviolet curing agent may further contain an ultraviolet absorber.
  • the ultraviolet absorber is not particularly limited, for example, those described in JP-A-57-74193, JP-A-57-87988 and JP-A-62-261476 can be applied.
  • FIG. 15 is a block diagram showing the main functional configuration of the rendering device 300.
  • the drawing device 300 includes the robot arm 310, the head unit 224, the pinning device 320, the ink circulation device 8, the distance measuring device 225, the temperature adjustment device 226, the control section 240, and the like, as described above.
  • the control unit 240 is connected to each of the above components that make up the drawing apparatus 300, and controls these components.
  • the control unit 240 has a CPU, RAM, ROM (not shown), and the like.
  • the CPU reads and executes various programs, data, and the like according to the content of processing from a storage device such as a ROM, and controls the operation of each unit of the rendering device 300 according to the content of the executed processing.
  • the RAM temporarily stores various programs and data processed by the CPU.
  • the ROM stores various programs, data, and the like read by the CPU and the like.
  • control unit 240 performs three-dimensional data prepared in advance defining the surface shape of the work W and the drawing range, or the detection of the distance measuring device 225 as basic control for executing drawing on the work W. Based on the obtained three-dimensional data of the surface shape of the workpiece W and the area to be drawn, motion control for drawing is executed in the area to be drawn. In other words, while ejecting ink from each nozzle 111 of the head unit 224 and irradiating near-infrared rays by the pinning device 320, the robot is moved so that the inkjet head 100 can be scanned forward or backward (conveyance of the head unit 224). Motion control of the arm 310 is executed. The scanning of the head unit 224 may be repeated while changing the position of the head unit 224 in the horizontal direction.
  • control unit 240 performs the following processing on the ink circulation device 8 of the drawing device 300 . That is, the control unit 240 controls the flow path R communicating with the nozzle 111 so that the average shear rate of the flow path R communicating with the nozzle 111 becomes a preset shear rate in the range of 1000 to 10000 [1/s].
  • the ink circulation amount is in the range of 30 to 300 [ml/min].
  • a liquid level sensor is provided to detect the liquid level of each of the sub-tanks 81 and 82, and the liquid levels of the tanks 81 and 82 are appropriately adjusted by operating the pumps 88 and 89 to achieve the target pressure P1 and pressure P2. of ink (circulation flow Q).
  • a reserve ink tank serving as a buffer may be provided in the middle of the ink flow path 86 .
  • the pressure P1 and the pressure P2 may be adjusted, and the circulation flow rate Q may be controlled by the pressure difference (circulation differential pressure ⁇ P) between the pressure P1 and the pressure P2.
  • the circulation differential pressure ⁇ P is preferably within the range of 5 kPa to 30 kPa.
  • control unit 240 performs temperature control of ink by the temperature adjustment device 226 as basic control for executing drawing on the work W.
  • the ink is temperature dependent, especially when it contains a gelling agent, a decrease in temperature causes an increase in viscosity due to gelation. For this reason, the control unit 240 heats the ink before it is ejected from the inkjet head 100 by the temperature adjustment device 226, creates a temperature difference between the ink and the surface of the work W, and attaches the ink to the surface of the work W. Control is performed to effectively gel the ink that has been applied.
  • the temperature adjustment device 226 controls the ink before being ejected from the inkjet head 100. is controlled to be heated to 80° C. to reduce the viscosity before ejection, and after ejection, the ink adhering to the surface of the work W is gelled to improve adhesion.
  • a means for detecting the temperature of the workpiece W may be provided in the chamber 330, and control may be performed to adjust the temperature of the ink by the temperature adjusting device 226 based on the detected temperature.
  • the control unit 240 also includes an attitude control unit 241, a distance control unit 242, a nozzle selection control unit 243, a nozzle selection control unit 243, a distance control unit 242, a nozzle selection control unit 243, and a control unit 241, which execute predetermined control for realizing more suitable drawing in addition to the basic control described above.
  • a drawing control unit 244 is provided.
  • the attitude control unit 241, the distance control unit 242, the nozzle selection control unit 243, and the first drawing control unit 244 are functional configurations realized by the CPU of the control unit 240 executing software. However, hardware such as a circuit for executing these functions may be provided together with the control unit 240 . Note that although FIG.
  • the attitude control section 241 controls the attitude of the head unit 224 . That is, the posture control unit 241 controls the operation of the robot arm 310 so that each inkjet head 100 of the head unit 224 ejects ink in a direction facing the surface of the work W (for example, perpendicularly). More specifically, as shown in FIG. 14, the ink ejected from the nozzle 111 located at the center position c (see FIG. 16) in the horizontal direction among all the nozzles 111 of the head unit 224 is applied to the surface of the work W.
  • the row direction of the nozzles 111 (the horizontal direction in the inkjet head 100) is oriented in the direction orthogonal to the scanning direction of the head unit 224 so that drawing is performed.
  • the robot arm 310 is controlled.
  • the scanning direction of the head unit 224 is determined by the surface shape of the workpiece W, for example. For example, if the surface shape is flat, scanning is performed in an arbitrary direction along the flat surface, and if the surface shape is like a ridge, scanning is performed along the ridge. At this time, the inclination of the surface of the workpiece W on the scanning line of the head unit 224 can be obtained from the above-described three-dimensional data or detection by the distance measuring device 225 .
  • the distance control section 242 executes scanning control of the head unit 224 which is executed together with attitude control of the head unit 224 by the attitude control section 241 . That is, the distance control unit 242 adjusts the robot arm 310 so that the scanning of the head unit 224 is performed while the distance from the nozzle 111 at the center position c to the surface of the workpiece W is maintained at the proper discharge distance d. Perform motion control. More specifically, as shown in FIG. 14, the distance from the tip of the nozzle 111 located at the aforementioned center position c (see FIG. 16) to the surface of the workpiece W on the extension line in the ejection direction maintains the ejection distance d.
  • the robot arm 310 is controlled so that the head unit 224 is transported in the scanning direction.
  • the distance to the surface of the workpiece W on the scanning line of the head unit 224 can be obtained from the three-dimensional data described above or from the detection of the distance measuring device 225 .
  • the nozzle selection control section 243 executes ejection control of the inkjet head 100 executed together with the attitude control section 241 and the distance control section 242 . That is, the nozzle selection control unit 243 performs operation control for each inkjet head 100 to restrict ejection of the nozzles 111 whose distance to the workpiece W is outside the proper ejection distance d (target value).
  • FIG. 16A and 16B are explanatory diagrams of ejection control of the inkjet head 100 by the nozzle selection control unit 243.
  • FIG. As described above, the distance from the nozzle 111 at the center position c to the surface of the workpiece W is maintained at the appropriate ejection distance d by scanning control by the distance control unit 242, and drawing is performed. Other nozzles 111 that eject ink may not be able to maintain a proper ejection distance d depending on the surface shape of the work W.
  • FIG. For example, if the range of the distance allowed as the proper ejection distance from the nozzle 111 to the surface of the workpiece W is within a range of ⁇ d with respect to d, the nozzle selection control unit 243 arranges the ink in a line.
  • the distance to the surface of the work W is obtained for all nozzles 111 that eject ink, and the nozzles 111 whose distance is outside the range of ⁇ d with respect to d are controlled to prohibit ink ejection.
  • the solid line arrow indicates the discharge permitted state
  • the dotted line indicates the discharge prohibited state.
  • the nozzle selection control unit 243 may select nozzles as follows.
  • Control is performed to prohibit ejection from all nozzles 111 whose distance to the surface of the workpiece W is outside the range of ⁇ d with respect to d, and which are farther than the nozzle 111 closest to the nozzle 111 at the center position c. you can go
  • the first drawing control unit 244 scans the head unit 224 from the rear side of the head unit 224 when the pinning device 320 sets the traveling direction of the head unit 224 to the front. Control the robot arm 310 to maintain the ink thickening configuration. For example, as shown in FIG. 2, when the head unit 224 is scanned in the M direction (to the left in the drawing), the pinning device 320 is kept on the right side of the head unit 224 (rear side in the traveling direction). is done.
  • the near-infrared rays can be irradiated so as to follow the ink adhering to the surface of the work W, effectively increasing the viscosity of the ink after ejection. be able to.
  • the drawing apparatus 300 configured as described above performs drawing while the robot arm 310 holds the inkjet head 100 . Since the inkjet head 100 ejects ink droplets from individual nozzles 111, unlike the case of spraying paint, the ink droplets are attached one by one to the surface of the work W, which is the object to be drawn. This makes it possible to perform drawing with little loss. In addition, since the ink is less likely to scatter, it is possible to appropriately draw with ink at the target position and range, and it is possible to reduce the burden of advance preparation such as masking. In addition, it is possible to reduce the burden of post-processing of excess ink that is scattered.
  • the drawing device 300 includes the pinning device 320 that increases the viscosity of the ink ejected from the inkjet head 100, even if the surface of the work W is inclined or downward rather than horizontal, Also, it is possible to effectively reduce the dripping of the adhered ink, and it is possible to improve the drawing quality.
  • the pinning device 320 of the drawing device 300 performs pinning so as to increase the viscosity of the ink ejected from the inkjet head 100 on the surface of the work W. is suppressed.
  • the pinning device 320 is held by the robot arm 310 together with the inkjet head 100, it is possible to maintain a constant relationship between the ink adhesion position and the position at which the pinning device 320 pins the ink. Regardless of the operation of 310, it is possible to stably perform drawing with little dripping.
  • control unit 240 includes the attitude control unit 241
  • the ink is properly ejected from the inkjet head 100 in a direction perpendicular to the surface of the work W, so that better drawing can be performed. It is possible to maintain the drawing quality even higher.
  • the nozzle 111 can be directed in an appropriate direction to face the work W, and the nozzle 111 can be satisfactorily applied to any inclined plane. It is possible to draw.
  • control unit 240 of the drawing apparatus 300 includes the distance control unit 242, drawing can be performed while maintaining an appropriate discharge distance d with respect to the surface of the work W, and high drawing quality can be maintained. becomes possible.
  • control unit 240 since the control unit 240 includes the nozzle selection control unit 243, ejection from the nozzles 111 that deviate from the appropriate ejection distance d due to unevenness or curved shape of the surface of the work W is restricted. High drawing quality can be maintained regardless of the surface shape.
  • control unit 240 includes the first drawing control unit 244, when drawing is performed by scanning the inkjet head 100 in a predetermined scanning direction, even if the course in the scanning direction changes,
  • the pinning device 320 can perform pinning so as to follow the ink adhering to the surface of the work W, and it is possible to effectively increase the viscosity of the ink after ejection.
  • the pinning device 320 is an irradiation device that irradiates the ejected ink with energy rays such as infrared rays, ultraviolet rays, or excimer emission, it is possible to effectively dry or cure the ejected ink. Ink adheres better and dripping can be suppressed more effectively.
  • energy rays such as infrared rays, ultraviolet rays, or excimer emission
  • the pinning device 320 is composed of a heating device that heats the ejected ink, the ejected ink can be dried effectively, and the ink adheres more effectively and the liquid is more effectively dried. Who can be restrained? Moreover, when a heating device is used as the pinning device, it is possible to achieve necessary and sufficient pinning because the amount of heat can be easily adjusted.
  • the drawing apparatus 300 ejects thixotropic ink having a viscosity of 200 [mPa s] or less at a shear rate of 1000 [1/s] by the inkjet head 100, the ink is sheared before ejection. If the speed is increased, the viscosity is reduced, enabling good discharge. It becomes possible to suppress dripping more effectively.
  • the drawing apparatus 300 includes the ink circulation device 8 that circulates the ink supplied to the nozzles 111 at a shear rate of 1000 [1/s] or higher, the viscosity of the thixotropic ink can be sufficiently reduced. It can be supplied to the nozzles 111 of the inkjet head 100, and good ejection can be performed.
  • the ink circulation device 8 circulates the ink at an ink circulation rate of 30 [ml/min] or more, thereby enabling the circulation of the ink at a high shear rate, and the thixotropic ink can be discharged more satisfactorily. becomes possible.
  • the pinning device 320 can be configured to irradiate the ink with ultraviolet rays so that the ink adhered to the surface of the work W can be cured. It becomes possible to reduce the dripping of the liquid more effectively. Furthermore, when an ultraviolet absorber is added to the ink, the curability of the ultraviolet curing agent is improved, and dripping of the ink can be reduced more effectively. Furthermore, when a gelling agent is added to the ink, the ink can be gelled due to its temperature dependence, so that it is possible to more effectively reduce ink dripping.
  • the drawing apparatus 300 since the drawing apparatus 300 includes the temperature adjustment device 226 that heats the ink before it is ejected from the inkjet head 100, it is possible to eject the ink at an appropriate temperature according to the temperature dependency of the ink. becomes.
  • the temperature adjustment device 226 heats the ink to a temperature at which it melts, and by creating a temperature difference from the surface temperature of the work W in advance, the ink is discharged. The subsequent ink can be satisfactorily gelled on the surface of the work W, and ink dripping can be reduced more effectively.
  • FIG. 17 is a front view of a drawing apparatus 300 to which another configuration (1) of the head unit and pinning device is applied.
  • one head unit 224 and two pinning devices 320A and 320B are mounted on the tip of the robot arm 310.
  • Both of the pinning devices 320A and 320B have the same configuration as the pinning device 320 described above.
  • one pinning device 320A is arranged behind the head unit 224
  • the other pinning device 320B is arranged in front of the head unit 224.
  • the terms “front side” and “rear side” here refer to the "front side” and “rear side” of the inkjet head 100 described with reference to FIG.
  • the control unit 240 includes a second rendering control unit 245 in place of the first rendering control unit 244 described above (see FIG. 15).
  • the second drawing control unit 245 is also a functional configuration realized by the CPU of the control unit 240 executing software.
  • hardware such as a circuit that executes the functions of the second drawing control unit 245 may be provided together with the control unit 240 .
  • the second drawing control unit 245 sets the pinning device 320A to the rear side of the head unit 224 (the moving direction of the head unit 224 is the front side).
  • the robot arm 310 and the pinning device 320A are controlled so that the ink ejected onto the surface of the work W from the rear side of the head unit 224 is irradiated with near-infrared rays to perform the pinning operation.
  • the second drawing control unit 245 controls that when the head unit 224 scans the rear side MB of the inkjet head 100 to perform drawing, the pinning device 320B is positioned on the front side of the head unit 224 (the moving direction of the head unit 224 is The robot arm 310 and the pinning device 320B are controlled so that near-infrared rays are applied to the ink ejected onto the surface of the work W from the rear side of the head unit 224 (in the case of the front side) to perform the pinning operation.
  • the drawing apparatus 300 is equipped with another configuration (1) including the head unit and the pinning device, and scanning control is performed by the second drawing control unit 245, whereby forward scanning and backward scanning are performed. is continuously performed, it is possible to perform drawing smoothly and continuously while effectively suppressing the occurrence of dripping without changing the arrangement of the head unit 224 and the pinning devices 320A and 320B.
  • FIG. 18 is a front view of a drawing apparatus 300 to which another configuration (2) of the head unit and pinning device is applied.
  • two head units 224A and 224B and one pinning device 320 are mounted on the tip of a robot arm 310.
  • Both of the head units 224A and 224B have the same configuration as the head unit 224 described above.
  • one head unit 224 A is arranged on the front side with respect to the pinning device 320 and the other head unit 224 B is arranged on the rear side with respect to the pinning device 320 .
  • the terms “front side” and “rear side” refer to the “front side” and the “rear side” of the inkjet head 100 described with reference to FIG. It is assumed that the two head units 224A and 224B are attached to the tip of the robot arm 310 with the front, rear, left, right, and up and down directions aligned. The directions of the arrows indicating front, rear, top and bottom shown in FIG.
  • the control unit 240 includes a third rendering control unit 246 in place of the first rendering control unit 244 described above (see FIG. 15).
  • the third drawing control unit 246 is also a functional configuration realized by the CPU of the control unit 240 executing software.
  • hardware such as a circuit that executes the functions of the third drawing control unit 246 may be provided together with the control unit 240 .
  • the third drawing control unit 246 controls the front side with respect to the pinning device 320 (the pinning device The drawing device 300 is controlled so that ink is ejected from the head unit 224A located on the front side of 320) and the pinning device 320 irradiates the ink ejected onto the surface of the work W with near-infrared rays to perform a pinning operation. Further, when performing drawing by scanning the head unit 224 to the rear MB of the inkjet head 100, the third drawing control unit 246 controls the rear side of the pinning device 320 (the moving direction of the head unit 224 is the front side).
  • Ink is ejected from the head unit 224B located on the front side of the pinning device 320, and the pinning device 320 irradiates the ink ejected onto the surface of the work W with near-infrared rays to perform a pinning operation. to control.
  • the drawing apparatus 300 is equipped with the other configuration (2) including the head unit and the pinning device, and the scanning control is performed by the third drawing control unit 246, whereby forward scanning and backward scanning are performed. is continuously performed, it is possible to perform drawing smoothly and continuously while effectively suppressing the occurrence of dripping without changing the arrangement of the head units 224A and 224B and the pinning device 320.
  • the drawing apparatus 300 may be configured to include an adjustment mechanism 340 that adjusts the tilt angle of the work W.
  • FIG. 19 is a perspective view of the adjustment mechanism 340.
  • the adjustment mechanism 340 includes a base 341 and a support portion 342 that supports the workpiece W.
  • the base 341 supports the support portion 342 so as to be rotatable about a predetermined rotation axis J. As shown in FIG. In the example of FIG. 19, the base 341 supports the support portion 342 around the horizontal rotation axis J.
  • the work W when the work W is large, it may be configured to have two sets of the base 341 and the support portion 342 so that the work W is supported at both ends.
  • the angle of the work W is adjusted by the adjustment mechanism 340.
  • the control unit 240 may automatically perform a process of recalculating the coordinate values of the surface of the work W when the adjustment angle is input.
  • a sensor for detecting the rotation angle may be provided on the shaft of the support portion 342 of the adjustment mechanism 340, and a function of recalculating the coordinate values of the surface of the workpiece W in the coordinate system of the robot arm 310 from the detection signal may be provided.
  • the drawing device 300 paints the surface of the work W with a single color. good.
  • the head unit 224 may be detachable from the robot arm 310 and may be replaceable with another head unit 224 that draws various colors.
  • the single head unit 224 is provided with inkjet heads 100 for various colors (for example, Y (yellow), M (magenta), C (cyan), and K (black)), or The head unit 224 may be held by one robot arm 310, and drawing may be performed by multicolor image formation.
  • a multi-joint type robot arm 310 has been exemplified, the type of robot is not limited to this, and other types of robot configuration (for example, Cartesian coordinate type, SCARA type, etc.) may be partially or wholly incorporated. It's okay.
  • the present invention has industrial applicability for a drawing apparatus and drawing method that perform drawing by ejecting ink.
  • ink circulation device 100 inkjet head 111 nozzles 224, 224A, 224B head unit 225 distance measuring device 226 temperature adjustment device (temperature adjustment section) 240 control unit 241 attitude control unit 242 distance control unit 243 nozzle selection control unit 244 first drawing control unit 245 second drawing control unit 246 third drawing control unit 300 drawing device 310 robot arms 320, 320A, 320B pinning device 340 adjustment mechanism P discharge position W work (object to be drawn) d Discharge distance

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005342970A (ja) * 2004-06-02 2005-12-15 Roland Dg Corp インク・ジェット・プリンタにおけるインク・ヘッド配置構造
JP2012040760A (ja) * 2010-08-19 2012-03-01 Konica Minolta Holdings Inc インクジェット記録方法
JP2014050832A (ja) * 2012-09-05 2014-03-20 Heiderberger Druckmaschinen Ag 対象物の表面を画像形成及び／又は塗装する方法
US20190337306A1 (en) * 2017-01-12 2019-11-07 Reydel Automotive B.V. Printing and drying installation and printing and drying method
JP2021088109A (ja) * 2019-12-04 2021-06-10 パナソニックＩｐマネジメント株式会社 印刷装置
WO2021172007A1 (ja) * 2020-02-28 2021-09-02 コニカミノルタ株式会社 インクジェットインク及び画像形成方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005342970A (ja) * 2004-06-02 2005-12-15 Roland Dg Corp インク・ジェット・プリンタにおけるインク・ヘッド配置構造
JP2012040760A (ja) * 2010-08-19 2012-03-01 Konica Minolta Holdings Inc インクジェット記録方法
JP2014050832A (ja) * 2012-09-05 2014-03-20 Heiderberger Druckmaschinen Ag 対象物の表面を画像形成及び／又は塗装する方法
US20190337306A1 (en) * 2017-01-12 2019-11-07 Reydel Automotive B.V. Printing and drying installation and printing and drying method
JP2021088109A (ja) * 2019-12-04 2021-06-10 パナソニックＩｐマネジメント株式会社 印刷装置
WO2021172007A1 (ja) * 2020-02-28 2021-09-02 コニカミノルタ株式会社 インクジェットインク及び画像形成方法

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