WO2023112834A1 - 印刷方法、印刷システム、及び印刷装置 - Google Patents
印刷方法、印刷システム、及び印刷装置 Download PDFInfo
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- WO2023112834A1 WO2023112834A1 PCT/JP2022/045343 JP2022045343W WO2023112834A1 WO 2023112834 A1 WO2023112834 A1 WO 2023112834A1 JP 2022045343 W JP2022045343 W JP 2022045343W WO 2023112834 A1 WO2023112834 A1 WO 2023112834A1
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- ink
- transfer medium
- printing
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Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
Definitions
- the present invention relates to a printing method, a printing system, and a printing apparatus.
- a method of performing transfer printing using a hot-melt layer formed of resin powder is known.
- an image is printed on a transfer medium (transfer sheet or the like) having a release layer formed on the surface thereof, and a hot melt layer is further formed on the entire surface of the transfer medium, and then the transfer medium and the transfer medium are separated.
- the image is transferred from the transfer medium to the transfer medium.
- a film having a receiving layer formed thereon is used as a transfer medium, and an image is printed on the transfer medium using color inks.
- a white ink layer is formed on the image using white ink (white ink).
- hot-melt resin powder (powder) is adhered onto the white ink layer of the transfer medium, and pressed by a heat press to transfer the image.
- a method of forming a hot-melt layer in conformity with an image without forming the hot-melt layer on the entire surface of the transfer medium for example, Patent Document 1.
- the transfer medium uses ink that is non-water-repellent but that maintains the adhesion of the powder between the time the image is formed and the powder is sprinkled. Use a transfer sheet that remains impermeable. Also, as the powder, resin powder of a predetermined grade with a small particle size is used. However, in this case, it is conceivable that the printing cost will increase significantly and the degree of freedom of printing conditions will decrease significantly due to the limited conditions of transfer media and powder that can be used.
- the inventor of the present application relates to transferring an image by a more appropriate method. For example, even when using a general color ink or a transfer medium used for transfer, an image can be transferred more appropriately without forming a layer of white ink.
- the transferability is lower in the low gradation region expressing a light color in the image compared to the high gradation region expressing a darker color, It was found that unintended transfer unevenness occurs.
- the inventors also discovered that the cause of this is that the amount of color ink in the low gradation range is reduced, so the amount of hot-melt resin adhering to that portion is reduced, and the image cannot be completely transferred. .
- the transferability of the image deteriorates in that portion, for example, areas on the transfer medium that should be colored are scattered with areas that are not colored.
- uneven transfer occurs.
- the inventor of the present application considered using clear ink, which does not easily affect the color of the image, in addition to the color ink.
- clear ink which does not easily affect the color of the image, in addition to the color ink.
- the present invention provides a printing method for drawing an image on a transfer medium by transferring an image printed on a transfer medium to the transfer medium, wherein the printing is performed by an inkjet method.
- a printing step of printing the image on the transfer medium by a device and a hot-melt resin attaching step of attaching hot-melt resin powder, which is a powder containing a resin softened by heating, to the transfer medium on which the image is printed;
- hot-melt resin powder which is a powder containing a resin softened by heating
- the hot-melt resin portion which is a resin portion formed by softening the hot-melt resin powder by heating
- a clear ink head that is an inkjet head that ejects clear ink that is colorless and translucent ink, and in the transfer medium, a region where the colored ink is ejected from the colored ink head In the printing step, the clear ink is further ejected from the clear ink head to at least a part of.
- a known transfer film can be suitably used as the transfer medium.
- a transfer film for transfer by the DTF method Direct to Film method
- a transfer medium a medium other than a film (for example, a paper medium, etc.) may be used.
- a cloth medium can be preferably used as the transfer medium.
- the colored ink for example, known color ink (for example, known ink for textile printing, etc.) can be preferably used.
- an ink containing a pigment as a coloring material eg, water-based pigment ink, etc.
- the transfer stage for example, by moving at least part of the coloring material adhering to the transfer medium to the transfer medium together with at least part of the hot-melt resin portion, the image is transferred from the transfer medium to the transfer medium.
- clear ink for example, it is conceivable to increase the transfer rate of the coloring material. More specifically, for example, an area on the transfer medium where colored ink is ejected from a colored ink head is defined as an image expression area, and the amount of colored ink ejected per unit area is greater than a preset reference amount.
- the printing device will cause the small amount of ink in the image expression area to be By ejecting clear ink onto at least part of the area, it is conceivable that the transfer rate in at least part of the small amount of ink area will be higher than when clear ink is not ejected. With this configuration, for example, it is possible to appropriately prevent the occurrence of transfer unevenness, etc., and to perform image transfer appropriately.
- a region that expresses colors in a low gradation range in an image will be a low ink region.
- the small ink area for example, by ejecting the clear ink to at least a part of the small amount of ink area in the printing stage, the position where the clear ink is ejected is covered with the hot melt resin in the adhesion stage. It can be considered that the amount of adhering hot-melt resin powder is made larger than when clear ink is not ejected.
- this configuration for example, it is possible to appropriately increase the transfer rate in the small amount of ink area.
- the amount of clear ink ejected to each position on the transfer medium may be varied according to, for example, the amount of colored ink ejected to each position. More specifically, for example, an area in which the amount of colored ink ejected per unit area is greater than a predetermined amount larger than the reference amount is defined as a non-small amount ink area, and the transfer is performed.
- the amount of clear ink ejected per unit area to each position on the medium is defined as the amount of clear ejection
- the amount of clear ejection in the small amount of ink area is larger than the amount of clear ejection in the non-small amount of ink area in the printing stage. It is conceivable to vary the amount of clear ejection in accordance with the amount of colored ink ejected per unit area so as to increase the clear ejection amount. With this configuration, for example, the amount of clear ink used can be suppressed, and the clear ink can be appropriately ejected to a required location. Further, in this case, by reducing the clear ejection amount in the non-small amount of ink area, for example, it is possible to prevent the total amount of ink ejected to the same position from becoming excessively large.
- the printing apparatus ejects the colored ink and the clear ink from the colored ink head and the clear ink head to ejection positions set according to the printing resolution, for example.
- clear ink may be ejected so that a region including a plurality of ejection positions is continuously covered with colored ink and clear ink. More specifically, an ejection position where colored ink is ejected from a colored ink head is defined as a colored ejection position, and a colored ejection position where an adjacent ejection position is not a colored ejection position is defined as an isolated ejection position.
- the region can be considered as, for example, a region including an isolated ejection position.
- the transfer medium for example, it is possible to use a medium having an ink-absorbing ink-receiving layer formed thereon. If comprised in this way, it can prevent appropriately that bleeding of a colored ink generate
- each of the colored ink and the clear ink for example, it is conceivable to use an ink that contains a solvent and is fixed to the transfer medium by evaporation of the solvent.
- the size of the ink dots formed by the spread of the colored ink after landing on the transfer medium is used as the clear size. If the size of the dot formed when only colored ink is ejected to the ejection position is defined as the clear non-use size, then in the printing stage, for example, the colored ink is ejected in the small amount of ink area.
- the colored ink for example, an ink containing a binder resin, which is a resin fixed to the transfer medium together with the coloring material, can be preferably used.
- an ink containing the same resin as the binder resin as the clear ink.
- clear ink having characteristics similar to those of colored ink can be appropriately used.
- the ink containing the same resin as the binder resin tends to adhere to the hot-melt resin powder for a longer period of time than, for example, the ink containing no resin.
- the hot-melt resin powder can more reliably adhere to the positions where the clear ink has been ejected.
- the clear ink for example, it is conceivable to use an ink that does not contain the same resin as the binder resin in the colored ink. Even in such a configuration, by using clear ink, for example, it is possible to lengthen the time until the ink dries to a state where the hot-melt resin powder is less likely to adhere to the position where the clear ink is ejected.
- the hot-melt resin powder can be appropriately adhered to the position where the clear ink is ejected.
- the ink dots are flattened and spread. It can also be considered that it is preferable to have In this case, for example, it is conceivable to further perform an adjustment stage operation for adjusting how the clear ink dots spread on the transfer medium in the printing stage. With this configuration, for example, it is possible to appropriately adjust the size of the clear ink dots. Further, in this case, in the adjustment stage, for example, based on the result of printing an image on a transfer medium by a printing device under a preset first printing condition, it is determined whether or not the spread of clear ink dots is insufficient. judge.
- the printing conditions for causing the printing apparatus to perform printing at the printing stage are different from the first printing conditions, and the spread of the clear ink dots is A second printing condition is selected for which the With this configuration, for example, the hot-melt resin powder can more appropriately adhere to the positions where the clear ink has been ejected.
- image transfer using hot-melt resin powder can be performed more appropriately.
- FIG. 1 is a diagram illustrating a printing system 10 according to an embodiment of the invention
- FIG. FIG. 1A shows an example of the configuration of the printing system 10.
- FIG. 1B shows an example of the configuration of the printing unit 14 in the printing system 10.
- FIG. 4 is a diagram for explaining in more detail a plurality of inkjet heads 202 included in the head unit 102.
- FIG. 2(a), 2(b), and 2(c) show an example of the configuration of the head section 102.
- FIG. 4 is a flow chart showing an example of operations executed in the printing system 10 in this example. It is a figure explaining the reason etc. which use clear ink in this example.
- FIG. 4(a) shows an example of how to print on a transfer medium 50 according to the conventional method.
- FIG. 4(b) shows an example of how to print on the transfer medium 50 by a method different from the method shown in FIG. 4(a).
- FIG. 4C shows an example of how to print on the transfer medium 50 in this example.
- 4A and 4B are diagrams for explaining an image to be printed on a transfer medium 50;
- FIG. 5A shows an example of an image printed on the transfer medium 50.
- FIG. 5B shows an example of the state of color ink dots forming an image.
- FIG. 4 is a diagram showing an example of ejection positions for ejecting color ink and clear ink.
- FIGS. 6(a), 6(b), and 6(c) show examples of how to select ejection positions for ejecting clear ink.
- FIG. 4 is a flow chart showing an example of an operation of generating print data in a print data preparation unit 12; It is a figure explaining the experiment which the inventor of this application performed.
- FIG. 8(a) shows the composition of the clear ink used in the experiment.
- 8(b) and 8(c) show the results of the experiment.
- FIG. 1 is a diagram illustrating a printing system 10 according to one embodiment of the invention.
- FIG. 1A shows an example of the configuration of the printing system 10.
- FIG. 1B shows an example of the configuration of the printing unit 14 in the printing system 10.
- printing system 10 is similar to known printing systems 1 0 may have the same or similar characteristics.
- the printing system 10 is a system that draws an image on a transfer medium by transferring an image printed on a transfer medium 50 to a transfer medium (transfer target).
- a powder hot melt powder
- a powder is used to transfer the image from the transfer medium 50 to the receiving medium.
- a medium such as cloth (for example, various fabrics) is used as the medium to be transferred.
- a cloth medium processed into a predetermined product such as a T-shirt may be used.
- the transfer medium 50 for example, a known transfer medium used for transferring a cloth onto a transfer receiving medium can be suitably used.
- a transfer film for transfer by the DTF method Direct to Film method
- a transfer film for example, a PET film or the like may be used.
- a medium other than a film for example, a paper medium, etc.
- hot-melt resin powder known resin powder for transfer can be suitably used. More specifically, as the hot-melt resin powder, for example, a known hot-melt resin powder used for transferring cloth to a transfer medium can be suitably used. Moreover, as such a hot-melt resin powder, for example, urethane, acryl, polyester, polyamide, or a powder containing a mixture thereof can be preferably used.
- the hot-melt resin powder can be considered, for example, as thermoplastic resin powder.
- the hot-melt resin powder can also be considered, for example, as a hot-melt adhesive powder for transfer printing.
- the hot-melt adhesive powder can be considered to be, for example, an adhesive powder that is solid at room temperature, the main component of which is a thermoplastic polymer.
- the hot-melt adhesive powder can also be considered, for example, as a solid adhesive powder that does not contain water or an organic solvent.
- a hot-melt adhesive powder for example, multi-component adhesive powder or the like can be used.
- the printing system 10 includes a print data preparation unit 12, a printing unit 14, and a powder application unit in order to perform transfer using the transfer medium, the transfer medium 50, and the hot-melt resin powder as described above. 16 and a thermal transfer section 18 .
- the print data preparation unit 12 is configured to prepare print data for controlling the operation of the printing unit 14 .
- the print data preparing unit 12 generates print data to be supplied to the printing unit 14 based on image data representing an image to be printed on the transfer medium 50 by the printing unit 14 .
- a computer that controls the operation of the printing unit 14 according to a predetermined program can be used.
- the print data preparation unit 12 generates print data by performing halftone processing or the like on image data in accordance with the configuration of the printing unit 14 . Then, the print data preparation unit 12 supplies the print data to the printing unit 14 to control the operation of the printing unit 14 and cause the printing unit 14 to perform the printing operation. The operation of generating print data in the print data preparation unit 12 will be described in more detail later.
- the printing unit 14 is a configuration corresponding to the printing device in the printing system 10 . Based on the print data supplied from the print data preparation unit 12 , the print unit 14 performs an inkjet printing operation on the transfer medium 50 .
- the printing unit 14 is a serial inkjet printer.
- the printing unit 14 performs printing by causing the inkjet head to perform a main scanning operation in which ink is ejected while moving relative to an object to be printed in a preset main scanning direction (Y direction in the drawing). perform an action.
- the printing unit 14 also includes a head unit 102, a platen 104, a Y bar unit 106, a main scanning driving unit 108, a sub scanning driving unit 110, and a control unit 120, as shown in FIG. 1B, for example.
- the head section 102 is a section having a plurality of inkjet heads, and ejects ink from the plurality of inkjet heads toward the transfer medium 50 .
- the head unit 102 includes a plurality of color ink inkjet heads that eject color inks of different colors, and a clear ink inkjet head that ejects clear ink.
- the color ink of each color is an example of colored ink, which is ink containing a coloring material exhibiting a colored color.
- Each of the plurality of inkjet heads for color ink is an example of a head for colored ink.
- a clear ink inkjet head is an example of a clear ink head.
- the clear ink can be considered as, for example, colorless and translucent ink.
- the fact that the clear ink is colorless can be considered, for example, that the clear ink is not colored intentionally.
- Intentionally not adding a predetermined color can be considered, for example, not intentionally adding a coloring material.
- being colorless and translucent can be considered, for example, to be in a transparent state that does not substantially absorb light of a specific color in the visible light region.
- not substantially absorbing light of a specific color for example, it can be considered that it does not substantially absorb light of a specific color in the visible light region within the allowable range according to the quality required for printing. can.
- the clear ink for example, it is conceivable to use ink obtained by removing the coloring material from the color ink. In this case, in addition to the colorant, it is conceivable to further exclude substances used in association with the colorant from the color ink.
- the clear ink when a dispersant (pigment dispersant) for dispersing a colorant such as a pigment in the ink solvent is used, the clear ink has a composition obtained by removing the colorant and the dispersant from the color ink. and the like can be suitably used.
- the clear ink can be considered to be, for example, a transparent ink that is the same as or similar to the clear ink conventionally used in the technical field of inkjet printing.
- the clear ink used in this example can be considered to be used in the field of textile printing by expanding the use of clear ink used in inkjet printing other than textile printing.
- the configuration of the head section 102 will be described in more detail later.
- the platen 104 is a platform-shaped member that supports the transfer medium 50 so as to face the head section 102 .
- the Y bar portion 106 is a member extending in the main scanning direction at a position facing the platen 104 with the transfer medium 50 interposed therebetween.
- the Y bar portion 106 holds the head portion 102 on the surface facing the transfer medium 50 in a state that it can move in the main scanning direction, thereby guiding the movement of the head portion 102 in the main scanning direction during the main scanning operation.
- the main scanning driving unit 108 is a driving unit that causes the plurality of inkjet heads in the head unit 102 to perform main scanning operations.
- the main scanning drive unit 108 moves the head unit 102 along the Y bar unit 106 under the control of the control unit 120 and causes each inkjet head in the head unit 102 to eject ink.
- the sub-scanning driving unit 110 is a driving unit that causes the plurality of inkjet heads in the head unit 102 to perform sub-scanning operations.
- the sub-scanning operation can be considered as, for example, an operation of moving relative to the transfer medium 50 in the sub-scanning direction (X direction in the figure) perpendicular to the main scanning direction.
- the sub-scanning drive unit 110 moves the head unit 102 in the sub-scanning direction relative to the transfer medium 50 between main scanning operations, thereby causing the plurality of inkjet heads in the head unit 102 to sub-scan. make it work.
- the control unit 120 is a part including, for example, the CPU of the printing unit 14 .
- the control unit 120 controls the operation of printing on the transfer medium 50 by controlling the operation of each unit of the printing unit 14 based on the print data supplied from the print data preparation unit 12 . Further, the printing unit 14 thereby prints the image indicated by the image data on the transfer medium 50 .
- the powder application unit 16 applies hot-melt resin powder to the transfer medium 50 on which the image is printed in the printing unit 14 .
- the powder application unit 16 can be considered as, for example, a configuration for applying hot-melt resin powder to the transfer medium 50 on which an image is printed.
- the powder application unit 16 performs preheating for heating the transfer medium 50 to which the hot-melt resin powder is adhered to a predetermined temperature before transfer.
- the thermal transfer section 18 transfers the image from the transfer medium 50 to the transfer medium.
- the thermal transfer section 18 is an example of a transfer section.
- the thermal transfer unit 18 can be considered, for example, as a device that transfers an image from the transfer medium 50 to the transfer medium by applying heat and pressure while the transfer medium 50 and the transfer medium are overlapped.
- the operation of applying heat and pressure in a state where the transfer medium 50 and the transfer medium are overlapped can be considered, for example, as an action of placing the transfer medium 50 on the transfer medium and press-bonding them.
- a known heat press machine or the like can be suitably used. According to this example, for example, an image printed on the transfer medium 50 can be appropriately transferred to the transfer medium.
- the image transfer operations performed in printing system 10 are described in more detail below.
- the print data preparing section 12 , the printing section 14 , the powder application section 16 , and the thermal transfer section 18 can each be considered as functional components of the printing system 10 .
- a device including a configuration that implements the functions of the printing unit 14 can be considered as an example of the printing device.
- a single apparatus may realize a plurality of functional configurations.
- the print data preparation section 12 and the printing section 14 may be realized by one device.
- an operation of generating print data from image data and an operation of executing printing can be performed by a single device.
- the printing unit 14 and the powder applying unit 16 may be realized by one device.
- any one of the functional configurations shown in FIG. 1A may be configured with a plurality of devices.
- the powder application unit 16 with a device for attaching the hot-melt resin powder to the transfer medium 50 and a device for preheating.
- the operation of printing on the transfer medium 50 in the printing unit 14 the operation of attaching the hot-melt resin powder to the transfer medium 50 in the powder applying unit 16, and the preheating performed in the powder applying unit 16.
- the operations are preferably performed on a series of devices. In this case, execution of a plurality of operations by a series of devices can be considered to be, for example, continuous execution of a plurality of operations without the user carrying the transfer medium 50 .
- FIG. 2 is a diagram for explaining in more detail the plurality of inkjet heads 202 that the head section 102 has.
- 2(a), 2(b), and 2(c) are diagrams showing an example of the configuration of the head section 102, showing an example of how the plurality of inkjet heads 202 of the head section 102 are arranged.
- the ink jet heads 202 are distinguished by attaching reference numerals 202y, 202m, 202c, 202k, and 202t in the figure.
- the head unit 102 has a plurality of inkjet heads 202y, 202m, 202c, 202k, and 202t that respectively eject inks of different colors.
- the head section 102 further has, for example, a carriage for holding these inkjet heads 202 and the like.
- each of a plurality of inkjet heads 202y, 202m, 202c, and 202k is an inkjet head that ejects color ink, and has different colors.
- ink is ejected. More specifically, the inkjet head 202y ejects yellow (Y) ink.
- the inkjet head 202m ejects magenta (M) ink.
- the inkjet head 202c ejects cyan (C) ink.
- the inkjet head 202k ejects black (K) ink.
- each color ink of each color of YMCK is an example of ink of each color of process color which is the basic color used for color expression by the subtractive color mixing method.
- the YMCK color inks ejected from each of the inkjet heads 202y to 202k for example, known color inks may be used.
- known color inks for example, inks for textile printing that are used when printing on cloth by transfer can be preferably used.
- an ink containing a pigment as a coloring material can be preferably used.
- the YMCK color inks are inks that are fixed on the transfer medium 50 by the evaporation of solvents, and contain pigments, dispersants, binder resins, solvents, and the like.
- a pigment is an example of a coloring material.
- a dispersant is a substance for dispersing a pigment in a solvent.
- the binder resin is a resin for fixing the pigment onto the transfer medium 50 .
- the binder resin can also be considered as, for example, a resin or the like that is fixed on the transfer medium 50 together with the coloring material in the colored ink.
- a solvent is a liquid that dissolves or disperses other ingredients in the ink.
- an aqueous solvent such as water can be suitably used.
- a solvent (organic solvent) other than the aqueous solvent may be used.
- the YMCK color inks used by the inkjet heads 202y to 202k are water-based pigment inks for textile printing used for transfer onto a transfer medium of cloth.
- a known water-based pigment ink can be suitably used.
- the inkjet head 202t is an inkjet head that ejects clear ink.
- the clear ink is a colorless and translucent ink because it does not contain a coloring material such as a pigment.
- the clear ink for example, an ink having a composition obtained by removing the pigment and the dispersant from each color ink of YMCK can be preferably used.
- the clear ink can also be considered as ink or the like that is fixed on the transfer medium 50 by evaporating the solvent, for example. Further, it can be considered that the clear ink contains the same resin as the binder resin in each color ink of YMCK, for example.
- the inkjet heads 202y to 202k are aligned in the main scanning direction, for example, with their positions aligned in the sub-scanning direction.
- the position of the inkjet head 202t in the sub-scanning direction may be different from that of the inkjet heads 202y to 202k, as shown in FIG. 2A, for example.
- the inkjet head 202t may be located at the same position in the sub-scanning direction as the inkjet heads 202y to 202k. More specifically, in the example shown in FIG.
- the inkjet head 202t is arranged on one side in the sub-scanning direction with respect to the array of the inkjet heads 202y to 202k.
- the inkjet head 202t is arranged on one side in the main scanning direction with respect to the alignment of the inkjet heads 202y to 202k.
- the number of inkjet heads 202t in the head section 102 may be plural, as shown in FIG. 2C, for example.
- each of the plurality of inkjet heads 202t is arranged on one side and the other side in the main scanning direction with respect to the arrangement of the inkjet heads 202y to 202k.
- the arrangement of the inkjet heads 202y to 202k and 202t in the head section 102 may be different from that shown in FIGS. 2(a), 2(b) and 2(c).
- some of the inkjet heads 202 may be positioned differently from the other inkjet heads 202 in the sub-scanning direction.
- the transfer medium it is conceivable to use, for example, a transfer film on which an ink-absorbing layer (receptive layer) is formed.
- An ink-receiving layer can be thought of as, for example, a layer that prevents ink bleeding by absorbing ink before it spreads excessively on the transfer medium.
- bleeding of color ink can be appropriately prevented.
- the color ink in order to more appropriately prevent bleeding of the color ink, for example, in the printing section 14 (see FIG. 1), the color ink lands on each position of the transfer medium before the clear ink. It is preferable to print as follows.
- the transfer medium may be a medium other than a film such as a paper medium. Also in this case, by using the transfer medium on which the receiving layer is formed, for example, it is possible to appropriately prevent the occurrence of ink bleeding and perform printing on the transfer medium appropriately.
- the inkjet head 202t on the downstream side of the inkjet heads 202y to 202k in the transport direction of the transfer medium.
- the conveying direction of the transfer medium can be considered, for example, as the direction in which the transfer medium moves relative to the head unit 102 .
- the direction of relative movement of the head unit 102 with respect to the transfer medium during the main scanning operation is set to the inkjet head 202t with respect to the inkjet heads 202y to 202k.
- the head unit 102 having the configuration shown in FIG. 2C it is conceivable to eject clear ink from the inkjet head 202t only during the main scanning operation in .
- the direction of relative movement with respect to the transfer medium during the main scanning operation is bidirectional, and in the main scanning operation in each direction of movement, It is conceivable to eject the clear ink from the inkjet head 202t on the rear side with respect to the inkjet heads 202y to 202k.
- the clear ink may be landed at each position on the transfer medium before the color ink. Further, in this case, for example, using the head unit 102 having the configuration shown in FIG. It is conceivable that the clear ink is ejected from the nozzle.
- FIG. 3 is a flowchart showing an example of operations performed by the printing system 10 in this example.
- the image printed on the transfer medium in the printing unit 14 is transferred to the transfer medium.
- the print data preparing unit 12 generates print data to be supplied to the printing unit 14 based on image data representing an image to be printed on the transfer medium (S102).
- S102 image data representing an image to be printed on the transfer medium
- the printing unit 14 prints the image on the transfer medium based on the print data supplied from the print data preparation unit 12 (S104).
- step S104 the operation of step S104 is an example of the operation in the printing stage.
- the printing section 14 ejects color ink from the inkjet heads 202y to 202k in the head section 102 onto at least a portion of the transfer medium.
- clear ink is ejected from the inkjet head 202t to at least part of the area of the transfer medium where the color ink is ejected from any of the inkjet heads 202y to 202k.
- the reason for using the clear ink in this example, how to eject the clear ink, etc. will be described in more detail later.
- the powder application unit 16 applies hot-melt resin powder to the transfer medium on which the image is printed (S106).
- the operation of step S106 is an example of the operation in the step of attaching the hot melt resin.
- the application of the hot-melt resin powder to the transfer medium by the powder application unit 16 is, for example, the same as or similar to the application of the hot-melt resin powder in a known transfer operation performed using the hot-melt resin powder. can be done. More specifically, it is conceivable that the hot-melt resin powder is applied to the transfer medium automatically, for example, by an apparatus.
- the powder application section 16 has, for example, a powder ejection section that ejects the hot-melt resin powder toward the transfer medium.
- the application of the hot-melt resin powder to the transfer medium may be performed manually by a user (operator).
- the powder application unit 16 causes the user to apply the hot-melt resin powder to the transfer medium, for example, by holding the transfer medium on which the image is printed in a predetermined state.
- the hot-melt resin powder applied to the transfer medium adheres to the transfer medium by adhering to the ink on the transfer medium. Therefore, on the transfer medium, the hot-melt resin powder adheres only to the positions where ink was ejected by the printing unit 14 in step S104. Further, in this case, the hot-melt resin powder at a position on the transfer medium where no ink has been ejected is removed from the transfer medium by the same or similar known method before preheating in the next step, for example. Remove.
- the hot-melt resin powder may also be removed automatically by the device or manually by the user.
- the transfer medium is preheated (S108).
- the hot-melt resin powder can be appropriately fixed to the transfer medium.
- the fixation of the hot-melt resin powder to the transfer medium can be considered, for example, as the fixation of the hot-melt resin powder to the transfer medium in a state in which it can be transferred to the transfer-receiving medium later.
- preheating can be considered as, for example, an operation of heating the transfer medium to a predetermined temperature to make the hot-melt resin powder sticky.
- Preheating performed in step S108 can also be performed in the same or similar manner as, for example, a known method. More specifically, in step S108, for example, the transfer medium is heated so that the temperature of the hot-melt resin powder reaches about 130° C. (for example, about 120 to 150° C.), and this state is maintained for about 5 minutes about 1 to 10 minutes).
- the thermal transfer unit 18 After preheating, the thermal transfer unit 18 performs transfer (thermal transfer) from the transfer medium to the transfer medium (S110).
- the operation of step S110 is an example of the operation in the transfer stage.
- the thermal transfer unit 18 heats and presses the transfer medium and the transfer medium in a superimposed state.
- the hot-melt resin powder is softened by heating to form a hot-melt resin portion, which is a resin portion.
- the thermal transfer section 18 adheres the hot-melt resin section to the medium to be transferred.
- the hot-melt resin portion can be considered, for example, as a resin portion made of hot-melt resin powder that becomes sticky by heating.
- the hot-melt resin portion may be, for example, a resin or the like formed by integrating softened hot-melt resin powder.
- the color material that expresses the color in the image printed on the transfer medium is adhered to the transfer medium together with at least a part of the hot-melt resin portion, and is transferred from the transfer medium. Transfer the image to the medium.
- an image is transferred from the transfer medium to the transfer medium by moving at least part of the coloring material adhering to the transfer medium together with at least part of the hot-melt resin portion to the transfer medium. It can be considered as a transfer operation or the like.
- the transfer performed in step S110 can also be performed, for example, in the same or similar manner as a known method.
- step S110 for example, the hot-melt resin portion is adhered to the transfer medium by applying pressure while performing heating at a temperature higher than the preheating temperature in step S108.
- the temperature of the hot-melt resin portion is about 140° C. (for example, about 100 to 180° C.).
- the heating and pressurizing time in step S110 is shorter than the heating time in preheating in step S108.
- the transfer medium After transferring the image from the transfer medium to the transfer medium in step S110, for example, the transfer medium is separated from the transfer medium (S112).
- the transfer medium to which the image has been transferred can be considered as a product (printed matter) of printing by the printing system 10 .
- Detachment of the transfer medium in step S112 can also be performed in the same or similar manner as, for example, known methods.
- a transfer medium having a release layer formed on the surface thereof can be preferably used. With this configuration, for example, the transfer medium can be peeled off easily and appropriately in step S112.
- the print product can be appropriately created in the printing system 10 .
- clear ink in addition to color ink when printing on the transfer medium, it is possible, for example, to improve transferability, reduce transfer unevenness, and reduce graininess. Become. Therefore, the reason for using the clear ink in this example, the method of discharging the clear ink, and the like will be described in more detail below.
- FIG. 4 is a diagram for explaining the reason why clear ink is used in this example. shows an example of FIG. 4(a) shows an example of how to print on a transfer medium 50 according to the conventional method.
- FIG. 4(b) shows an example of how to print on the transfer medium 50 by a method different from the method shown in FIG. 4(a).
- FIG. 4C shows an example of how to print on the transfer medium 50 in this example.
- the transfer medium 50 on which the ink receiving layer 54 is formed.
- a transfer medium 50 can be preferably used in a conventional method.
- the transfer medium 50 has a base portion 52 and an ink receiving layer 54 as shown in FIGS. 4(a) to 4(c).
- the base portion 52 is a portion that serves as a base of the transfer medium 50 .
- the ink receiving layer 54 is a layer for absorbing ink and is formed on the surface of the base portion 52 .
- the ink-receiving layer 54 can also be considered to form part of the base portion 52, for example.
- the base portion 52 can be considered to constitute the entire transfer medium 50 .
- the printing unit 14 see FIG.
- the conventional method shown in FIG. 4A has a configuration different from that of the printing unit 14 of this example.
- a conventional method uses a printing apparatus having an inkjet head for color ink and an inkjet head for white ink.
- the printing device forms a color ink layer 302 and a white ink layer 304 on the printing area 300 on the surface of the transfer medium 50 .
- the color ink layer 302 is an ink layer formed of color ink.
- the white ink layer 304 is an ink layer formed of white ink.
- the white ink layer 304 can be considered, for example, as a layer that hides the background color of the transfer medium after transfer and functions as a background in subtractive color mixing.
- the print area 300 can be considered, for example, as an area where color ink is ejected from an inkjet head. Also, in this case, for example, as shown in the drawing, a color ink layer 302 is formed on the transfer medium 50 . A white ink layer 304 is formed on the color ink layer 202 so as to cover the entire color ink layer 302 . Further, the white ink layer 304 is formed, for example, so as to fill the print area 300 with a predetermined density.
- resin powder 352 is applied on the white ink layer 304 as shown in the lower part of FIG. A hot-melt resin powder shown as is attached. Further, after the resin powder 352 is adhered, the transfer medium 50 and the transfer medium are overlapped, and heat and pressure are applied to transfer the image from the transfer medium 50 to the transfer medium. When printing and transferring are performed in this manner, the solid white ink layer 304 is formed, so that the amount of ink at each position of the printing area 300 is sufficiently increased. Therefore, the resin powder 352 can be appropriately adhered to the printing area 300 on the transfer medium 50 .
- the resin powder 352 is appropriately adhered to transfer the image with high quality. can be done properly.
- the white ink layer 304 becomes a lower layer than the color ink layer 302 on the transfer medium, and functions as a background for the color ink layer 302 . Therefore, even when a dark-colored fabric or the like is used as the transfer medium, an image can be appropriately expressed on the transfer medium.
- the portion corresponding to the white ink layer 304 is transferred to the transfer medium separately from the original image, which may impair the design and texture.
- a light-colored (light-colored) fabric such as white or beige as the transfer medium, or when expressing a design that makes use of the color and texture of the fabric used as the transfer medium (for example, unbleached fabric) etc.
- the background color of the transfer medium after transfer becomes a light-reflective color. Therefore, even without forming the white ink layer 304, it is possible to appropriately express colors by the subtractive color mixture method.
- a color ink layer 302 is formed on the print area 300 on the transfer medium 50 using a printing apparatus having an inkjet head for color ink. Then, the resin powder 352 is applied directly onto the color ink layer 302 . Further, after the resin powder 352 is adhered, the transfer medium 50 and the transfer medium are overlapped, and heat and pressure are applied to transfer the image from the transfer medium 50 to the transfer medium. Even in this case, the image can be transferred from the transfer medium 50 to the transfer medium. However, depending on the state of the image drawn on the transfer medium 50, the transfer rate may be lowered in a part of the image, and unintended transfer unevenness may occur.
- the color ink layer 302 is formed by ejecting color ink in accordance with the image to be drawn on the transfer medium 50 .
- the amount of ejected ink varies depending on the position in the printing area 300 .
- the amount of ink is less in a low tone area that expresses a light color compared to a high tone area that expresses a darker color.
- the manner in which the resin powder 352 adheres tends to vary depending on the position in the printing area 300 .
- the printing unit 14 uses the color ink and the clear ink on the printing area 300 of the transfer medium 50 to form an ink layer of the color ink and the clear ink. to form the image layer 306 .
- the resin powder 352 is applied directly onto the image layer 306 without forming the white ink layer 304 or the like. Further, after the resin powder 352 is adhered, the transfer medium 50 and the transfer medium are overlapped, and heat and pressure are applied to transfer the image from the transfer medium 50 to the transfer medium.
- the print unit 14 by using clear ink in addition to color ink when printing on the transfer medium 50 by the printing unit 14, for example, the influence of the color of the image printed on the transfer medium 50 can be prevented.
- Ink other than color ink can be appropriately ejected onto the transfer medium 50 while being appropriately suppressed.
- the clear ink is ejected even to a position where the amount of color ink is small, such as a low gradation area.
- the total amount of ink ejected onto the transfer medium 50 can be increased compared to the case where only color ink is used.
- the resin powder 352 can be more appropriately adhered to the transfer medium 50 .
- image transfer using the resin powder 352 can be performed more appropriately without forming the white ink layer 304 .
- clear ink can be used while suppressing the influence on the design.
- the clear ink is less noticeable on the transfer medium after transfer, it is possible to select and use only the necessary portions, for example. Therefore, according to this example, for example, it is possible to perform transfer with higher quality while appropriately preventing spoiling of design and texture.
- the transfer medium 50 having the ink-receiving layer 54 is printed by the inkjet method as in the present example, it can be considered that the ink after landing is less likely to wet and spread on the transfer medium 50 . can. Moreover, as a result, for example, it is conceivable that graininess tends to occur particularly in the low gradation range. Furthermore, when the resin powder 352 is adhered for transfer, the amount of the adhered resin powder 352 can be considered to depend on the amount of ink (printing amount) ejected at that position. Therefore, for example, when an image is transferred by the method shown in FIG. Graininess becomes more conspicuous on the transfer medium.
- the color ink on the transfer medium 50 can be more likely to wet and spread than when only color ink is used. . Further, this makes it possible, for example, to increase the size of ink dots formed on the transfer medium 50 with color inks, thereby making it difficult for graininess to occur. Further, in this case, as described above, the use of clear ink can appropriately prevent deterioration in transferability in the low gradation range. Therefore, for example, it is possible to more appropriately prevent graininess from becoming noticeable on the transfer medium after transfer.
- the printing unit 14 ejects the color ink and the clear ink so that the clear ink lands before the color ink is completely dried at each position on the transfer medium 50 where the color ink is to be ejected. preferably.
- this configuration for example, it is possible to more appropriately realize a state in which the color ink easily spreads on the transfer medium 50 .
- FIG. 5 is a diagram for explaining an image printed on the transfer medium 50.
- FIG. 5A shows an example of an image printed on the transfer medium 50.
- FIG. 5B shows an example of the state of color ink dots forming an image.
- ink is ejected to each position of the transfer medium 50 according to the color to be expressed.
- the amount of each color ink applied will vary. Also, in this case, for example, it can be considered that the gradation changes depending on the position of the image.
- the printing unit 14 prints an image having, for example, a high gradation portion 312 , a middle gradation portion 314 and a low gradation portion 316 on the transfer medium 50 . More specifically, FIG. 5(a) shows an example of an image to be printed when the print unit 14 prints on a plurality of print areas 300a to 300c.
- the print area 300 a is a print area including a high tone portion 312 , a middle tone portion 314 and a low tone portion 316 .
- the print area 300b is a print area configured only by the low gradation portion 316.
- the print area 300c is a print area configured only by the high gradation portion 312 .
- each of the print areas 300a to 300c is an example of an image expression area on the transfer medium 50 in which color ink is ejected from any one of the inkjet heads 202y to 202k (see FIG. 2).
- the high gradation portion 312 can be considered, for example, as a portion of the image that expresses a color with a gradation higher than a predetermined first reference.
- the gradation of the image is higher than the first reference, for example, the gradation of the color corresponding to any color ink (one of YMCK) is higher than the first reference. can be considered as high.
- the intermediate gradation portion 314 can be considered, for example, as a portion other than the high gradation portion 312 and the low gradation portion 316 in the image.
- the low gradation portion 316 can be considered, for example, as a portion of an image that expresses a color with a gradation lower than a predetermined second reference that is lower than the first reference.
- the fact that the gradation of the image is higher than the second reference means, for example, that the gradation of all the colors of the color ink (all the colors of YMCK) is lower than the second reference. be able to.
- the high gradation portion 312 can be considered as, for example, a portion that expresses colors in a predetermined high gradation range.
- the high gradation portion 312 can also be considered, for example, as an area that expresses a dark color or a dark color in an image.
- the low gradation portion 316 can also be considered as, for example, an area that expresses colors in a predetermined low gradation range.
- the low gradation portion 316 can also be considered as, for example, a portion that expresses a light color or bright color in an image.
- gradation is expressed by changing the density of ink dots formed per unit area.
- many dots 402 are densely formed as shown on the left side of FIG. 5B, for example.
- a smaller number of dots 402 are formed sparsely than in the high gradation portion 312, as shown on the right side of FIG.
- the intersections of vertical and horizontal broken lines indicate ink ejection positions set according to the printing resolution.
- each of the high gradation portion 312, the middle gradation portion 314, and the low gradation portion 316 in the image can be considered in association with the amount of color ink ejected per unit area. More specifically, in this case, the high gradation portion 312 can be considered, for example, as an area in which the amount of color ink ejected per unit area is increased. Also, the low gradation portion 316 can be considered as, for example, a region in which the amount of color ink ejected per unit area is reduced.
- the low gradation portion 316 is an example of a small amount of ink area, which is an area in which the amount of color ink ejected per unit area is less than a preset reference amount.
- the high gradation portion 312 is an example of a non-small amount of ink area that is at least part of the area that does not correspond to the small amount of ink area.
- the non-small amount of ink area can be considered to be, for example, an area in which the amount of color ink ejected per unit area is greater than a predetermined amount in each of the printing areas 300a to 300c. Also, in this example, this predetermined amount can be considered to be a larger amount than the reference amount for the small ink area.
- the combined portion of the high tone portion 312 and the middle tone portion 314 can be considered as an example of the non-small amount of ink area.
- the predetermined amount for the non-small amount of ink area can be considered to be the same amount as the reference amount for the small amount of ink area, for example.
- the printing unit 14 prints on the transfer medium 50 using clear ink in addition to color ink.
- clear ink is ejected onto at least part of the low gradation portion 316 in the image. Further, in this case, it is conceivable to eject color ink and clear ink, for example, as shown in FIG.
- FIG. 6 is a diagram showing an example of ejection positions for ejecting color ink and clear ink.
- FIG. 6 shows an example of ejection positions for ejecting color ink and clear ink, focusing on some ejection positions in the low gradation portion 316 (see FIG. 5).
- FIGS. 6A to 6C are diagrams showing examples of how to select ejection positions for ejecting clear ink.
- FIGS. 6A to 6C show various examples of how clear ink is ejected to positions where color ink dots 402 are discretely formed in the low gradation portion 316.
- FIG. 6 is a diagram showing an example of ejection positions for ejecting color ink and clear ink.
- FIG. 6 shows an example of ejection positions for ejecting color ink and clear ink, focusing on some ejection positions in the low gradation portion 316 (see FIG. 5).
- FIGS. 6A to 6C are diagrams showing examples of how to select
- a plurality of color ink dots 402 are spaced apart, for example, as shown on the upper left side in each of FIGS. It can be considered as a position formed by Also, in this case, it can be considered that the plurality of dots 402 spread to a size that does not contact each other. In this case, for example, if clear ink is not used, the amount of ink per unit area is reduced, and transferability may be degraded.
- the amount of ink per unit area is increased by further using clear ink.
- the method of ejecting the clear ink when considering increasing the total amount of ink ejected near each ejection position, the simplest method is as shown in the lower left side of FIG. Also, it is conceivable to eject a predetermined amount of clear ink to all the ejection positions.
- the diagram on the lower left side shows the arrangement of ink dots 404 formed with clear ink at the same positions as the plurality of ejection positions shown on the upper left side. Also, in the case shown in FIG. 6A, the clear ink dots 404 are formed at all ejection positions arranged at intervals corresponding to the printing resolution.
- the ejection position for ejecting the clear ink does not necessarily have to be strictly matched to the ejection position for ejecting the color ink. More specifically, when printing is performed by an inkjet method, the ejection positions for ejecting color ink are determined by, for example, halftone processing. In this case, even if the gradation to be expressed is the same, the position where the color ink is ejected is not always the same. Further, in this example, when the clear ink is ejected only to some ejection positions, it is conceivable that the ejection positions of the clear ink are also determined by predetermined processing such as halftone processing.
- the ejection position for ejecting the clear ink is also determined by the result of the processing.
- the relationship between the ejection position for ejecting the color ink and the ejection position for ejecting the clear ink is not strictly determined to a predetermined relationship, but rather, for example, an image before halftone processing or the like is performed. It is conceivable that it is determined as a relationship between gradations and a relationship between the amount of ink ejected per unit area. In this case, for example, as shown in FIG. 6C, color ink dots 402 and clear ink dots 404 are formed at some of the ejection positions where color ink dots 402 are formed. be done.
- No clear ink dots 404 are formed at other ejection positions, and only color ink dots 402 are formed.
- the clear ink dots 404 are formed only at some of the ejection positions where the color ink dots 402 are not formed. Even when configured in this manner, for example, it can be considered that the amount of ink is compensated by adding clear ink to a low tone region where the amount of color ink is small. Therefore, even when configured in this manner, for example, the total amount of ink ejected near each ejection position can be appropriately increased.
- the method of selecting the ejection position for ejecting the clear ink is not limited to the method described above, and other methods may be used.
- the ejection positions at which the color ink dots 402 are to be formed may be checked, and the ejection positions for forming the dots 404 may be determined according to the ejection positions.
- it is conceivable to form the clear ink dots 404 at the ejection positions where the color ink dots 402 are formed such as the ejection positions adjacent to the ejection positions where the color ink dots 402 are formed.
- clear ink dots 404 may be further formed at the ejection positions where the color ink dots 402 are formed.
- the clear ink is ejected to the portion where the ejection amount of the color ink is small among the printing regions on the transfer medium 50, thereby making the hot-melt resin powder It enhances the adhesion of In this case, a sufficient amount of hot-melt resin powder can be adhered to areas where a sufficiently large amount of color ink is ejected without using clear ink.
- the amount of ink ejected per unit area if the total amount of ink, which is the sum of the color ink and the clear ink, is too large, problems such as bleeding of the color ink are likely to occur. be done. Therefore, the amount of clear ink ejected to each position on the transfer medium 50 may be varied according to, for example, the amount of color ink ejected to each position.
- the amount of color ink ejected per unit area in the print area is larger. It is conceivable to vary the clear ejection amount between the high gradation portion 312 (see FIG. 5), which has a large amount of color ink, and the low gradation portion 316, which has a smaller amount of color ink ejected per unit area. In this case, for example, the clear ejection amount is adjusted according to the amount of color ink ejected per unit area so that the clear ejection amount in the low gradation portion 316 is larger than the clear ejection amount in the high gradation portion 312.
- the amount of clear ink used can be suppressed, and the clear ink can be appropriately ejected to a required location. Also, by reducing the clear ejection amount in the high gradation portion 312, for example, it is possible to prevent the total amount of ink ejected to the same position from becoming excessively large.
- the clear ejection amount may be different between the middle tone portion 314 and the low tone portion 316 .
- the amount of clear ejection is adjusted to the amount of color ink ejected per unit area so that the amount of clear ejection in the low gradation portion 316 is larger than the amount of clear ejection in the middle gradation portion 314. It is conceivable to make them different depending on the situation.
- the clear ejection amount may be different between the high gradation portion 312 and the middle gradation portion 314, for example.
- the amount of clear ejection is adjusted according to the amount of color ink ejected per unit area so that the amount of clear ejection in the middle gradation portion 314 is larger than the amount of clear ejection in the high gradation portion 312. It is conceivable to make them different. Also, it is conceivable to set the clear ejection amount to zero for a portion where a large amount of color ink is ejected, such as the high gradation portion 312 . In this case, for example, clear ink is not ejected to positions where the amount of color ink ejected per unit area is greater than a preset upper limit amount. With this configuration, for example, it is possible to more appropriately prevent the total amount of ink ejected to the same position from becoming excessively large.
- clear ink is used to enhance the adhesiveness of the hot-melt resin powder, for example, in the low gradation portion 316 .
- the transfer rate of the pigment which is the coloring material
- the transfer rate is defined as the ratio of the colorant that moves from the transfer medium 50 to the transfer medium during transfer.
- the printing unit 14 ejects clear ink onto at least part of the low gradation portion 316 .
- the amount of the hot-melt resin powder adhering to the position where the clear ink is ejected in the powder applying section 16 (see FIG. 1) is made larger than when the clear ink is not ejected.
- the ejection positions for ejecting color ink are determined by, for example, halftone processing.
- the print data preparation unit 12 (see FIG. 1) performs halftone processing and the like on image data to generate print data. In this case, it is conceivable to determine the positions at which the clear ink is to be ejected in a series of operations executed by the print data preparation unit 12 to generate the print data. Further, in this case, the print data preparation unit 12 generates print data by the operation shown in FIG. 7, for example.
- FIG. 7 is a flowchart showing an example of the operation of generating print data in the print data preparation unit 12.
- the print data preparing unit 12 generates print data to be supplied to the printing unit 14 based on image data representing an image to be printed on the transfer medium 50 by the printing unit 14 .
- image data is input to the print data preparation unit 12 (S202).
- the image data for example, general known color image data representing a color image may be used.
- an RGB image or the like representing a color image using red (R), green (G), and blue (B) as primary colors can be preferably used.
- Image data may be input to the print data preparation unit 12 from outside the print data preparation unit 12 via a network, a storage medium, or the like, for example.
- a color image represented by the image data it is conceivable to use an image in which each of the basic colors (primary colors) of the color representation is represented by three or more gradations. More specifically, as the color image represented by the image data, for example, an image that expresses each color of RGB, which is the basic color, with gradation of 8 bits or more, or the like can be preferably used.
- the print data preparation unit 12 performs preprocessing on the image data in accordance with the subsequent halftone processing (S204).
- preprocessing for example, resolution conversion processing, color conversion processing, color separation processing, and the like can be performed.
- the resolution process is, for example, a process of changing the resolution of an image in accordance with the resolution of printing executed by the printing unit 14 .
- the color conversion process is, for example, a process of converting the color of an image to match the color of ink used in the printing unit 14 .
- an image represented by print data may be converted into an image that expresses colors in the YMCK color system in accordance with the YMCK color inks used for printing.
- the color separation process can be considered as a process of dividing an image to be processed into images for each color of ink used in the printing unit 14, for example.
- the print data preparation unit 12 performs, for example, a color separation process on the image after the resolution change process and the color conversion process, and generates a plurality of grayscale images each corresponding to each color of YMCK.
- a grayscale image corresponding to each color of YMCK for example, it can be considered that the amount of ink of that color to be ejected to each position of the image is indicated.
- a grayscale image corresponding to each color of YMCK for example, it is conceivable to generate a grayscale image with gradation of 8 bits or more.
- the print data preparation unit 12 after performing the above-described preprocessing, the print data preparation unit 12 generates a clear image, which is an image used to determine the ejection position for ejecting clear ink (S206).
- the clear image can be considered as an image in which the ejection position of the clear ink is determined by performing halftone processing afterward, for example.
- a grayscale image may be generated as the clear image.
- the clear image indicates, for example, the amount of clear ink that is ejected to each position of the image.
- the clear image for example, it is possible to generate an image having the same number of gradations as the grayscale image corresponding to each color of YMCK generated in the color separation process.
- the print data preparation unit 12 determines the color to be ejected for each position of the image based on the grayscale image corresponding to each color of YMCK generated in the color separation process. Calculate the total amount of ink. Then, based on this total amount, the value (gradation) of each pixel of the clear image is determined.
- the amount of clear ink ejected can be appropriately changed according to the amount of color ink ejected to each position of the image during printing by the printing unit 14 .
- the print data preparation unit 12 performs halftone processing on the grayscale image corresponding to each color of YMCK and the clear image (S208).
- Halftone processing can be considered, for example, as processing for reducing the number of gradations of an image according to the configuration of the printing unit 14 .
- Halftone processing can also be considered as processing (RIP processing) for generating a raster image that designates ejection positions for ejecting ink of a color corresponding to a grayscale image, for example.
- the print data preparation unit 12 performs halftone processing on a grayscale image corresponding to each color of YMCK to generate a raster image that designates ejection positions for ejecting ink of that color.
- the print data preparation unit 12 performs halftone processing on the clear image to generate a raster image designating the ejection position for ejecting the clear ink.
- the print data preparation unit 12 supplies the data including these raster images to the printing unit 14 as print data. With this configuration, it is possible to appropriately supply the printing unit 14 with print data that specifies the positions at which the color ink and clear ink of each color are to be ejected, for example.
- the print data preparation unit 12 performs color separation processing based on the image data input to the print data preparation unit 12 to generate a grayscale image corresponding to each color of YMCK. do. Then, a clear image is generated based on the grayscale image corresponding to each color of YMCK generated by the color separation process.
- the clear image is also generated based on the image data input to the print data preparation unit 12, for example.
- the ejection position of the clear ink is automatically determined based on the image data that does not directly specify the ejection position of the clear ink. can be done.
- the operation of the print data preparation unit 12 can also be considered as determining the amount of clear ink to be ejected to each position of the image according to the gradation of the image indicated by the image data, for example.
- FIG. 8 is a diagram explaining an experiment conducted by the inventor of the present application.
- FIG. 8(a) shows the composition of the clear ink used in the experiment.
- 8(b) and 8(c) show the results of the experiment.
- a known aqueous pigment ink was used as the color ink.
- black ink in which the graininess is most conspicuous, was used as the color ink.
- the clear ink two types of ink shown as ink A and ink B in the drawing were used.
- the ink A can be considered as an ink obtained by removing the pigment, which is a coloring material, from the color ink.
- Ink B can be considered, for example, as an ink obtained by removing the pigment, which is the colorant, and the resin (resin emulsion) corresponding to the binder resin from the color ink.
- ink A and ink B can be considered to be substantially transparent inks.
- the ink A can be considered to be, for example, an ink that is transparent and contains a resin.
- the amount of color ink and clear ink ejected per unit area was variously changed to confirm the graininess of the transferred medium after transfer. Further, the confirmed graininess was quantified with reference to the limit sample.
- the upper table shows the results of the experiment when ink A was used.
- the lower table shows the results of the experiment using Ink B.
- numerical values 0 to 200 associated with ink A or ink B indicate the discharge amount (print amount) of the clear ink (ink A or ink B) discharged per unit area.
- Numerical values 0 to 200 associated with the color ink (Black) indicate the amount of color ink ejected per unit area.
- 0 indicates a state in which the corresponding ink is not ejected. Then, the amount of ink ejected per unit area increases in proportion to the numerical value.
- the grainy feeling was evaluated by quantification in five stages from 1 to 5. In this case, the value 1 corresponds to the state where the graininess is most noticeable, and the value 5 corresponds to the state where the graininess is the least noticeable.
- the hot-melt resin powder for example, is likely to adhere to ink containing a liquid component before it is completely dried. Therefore, when ink B, which dries easily, is used, it is likely to be necessary to eject a larger amount than ink A. Further, in ink B, it can be considered that the resin maintains adhesiveness even in a somewhat dry state. Therefore, in this respect as well, it can be considered that the effect of reducing graininess can be obtained with a smaller amount of ink B.
- the range surrounded by the thick solid line indicates the range in which the problematic transfer unevenness did not occur. This range can also be considered as, for example, a range in which transfer unevenness is resolved by discharging clear ink. Also, in the upper left side of the range surrounded by the thick solid line, the range surrounded by the upper and left broken lines and the lower and right thick solid lines is the range where only slight transfer unevenness occurred. This range can be considered, for example, as a range in which transfer unevenness is greatly reduced by discharging clear ink. From the results shown in FIG. 8C, it can be confirmed that in the case of using the ink A, the transferability is improved by using the clear ink in addition to the color ink. In this case, it can also be confirmed that the use of clear ink can prevent uneven transfer, particularly in the low gradation region where uneven transfer occurs if clear ink is not used.
- the ejection of the color ink and the clear ink was performed after the color ink was ejected to each position on the transfer medium, and then the clear ink was applied before the color ink at that position was completely dried.
- the ink was ejected to the same position. In this case, it can be considered that the color ink and the clear ink are simultaneously ejected onto the transfer medium.
- an experiment corresponding to the table in FIG. 8(c) was also performed for ink B. This experiment also showed that the use of clear ink in addition to color ink improved the transferability of ink B. It was confirmed that uneven transfer can be prevented by use.
- a textile printing ink containing a pigment as a coloring material can be suitably used as the color ink.
- the clear ink for example, an ink having a composition obtained by removing the colorant (pigment) and the dispersant from the color ink can be preferably used.
- the characteristics (liquidity) of the color inks and the clear inks used at the same time in the printing unit 14 are significantly different, the way of aggregation and separation of the inks on the transfer medium will be different. This is considered to be the cause of the deterioration of the image quality of printing (defective image quality).
- clear ink as described above it is possible to appropriately prevent the difference in properties between the color ink and the clear ink from becoming large. In addition, this makes it possible to perform high-quality printing more appropriately, for example.
- the clear ink it is also possible to use, for example, an ink that does not contain resin.
- an ink that does not contain resin it is possible to lengthen the time required for the ink to dry to the point where the hot-melt resin powder is less likely to adhere to the position where the clear ink is ejected. Further, as a result, for example, even when clear ink containing no resin is used, the hot-melt resin powder can be appropriately adhered to the positions where the clear ink is ejected.
- the difference in composition between the color ink and the clear ink the volume of the clear ink is reduced by removing some of the components (colorant, etc.) from the color ink. and can be adjusted. It is also conceivable to use a resin different from the binder resin in the color ink as the resin contained in the clear ink.
- the ink dots of the color inks can be easily wetted and spread, and the size of the dots can be increased. can be done.
- the color ink spreads out by wetting due to the discharge of the clear ink for example, bleeding occurs between the clear ink and the color ink.
- this bleeding can be considered as bleeding that does not degrade printing quality, unlike, for example, inter-color bleeding that occurs between different color inks.
- the bleeding between the clear ink and the color ink for example, by lowering the color density and widening the dot diameter compared to the case where the color ink is used alone, the graininess in the low gradation range can be improved. can also be considered to reduce
- the size of a dot formed when only color ink is ejected to the ejection position is defined as the clear non-use size.
- the size when clear is used is larger than the size when clear is not used. It can be considered that clear ink is ejected. With this configuration, for example, it is possible to appropriately increase the size of ink dots formed with color inks. Moreover, thereby, for example, graininess can be appropriately reduced.
- the hot-melt resin powder is adhered more appropriately to the low-gradation portion of the image by using the clear ink.
- the hot-melt resin powder is particularly difficult to adhere to the isolated ink dot positions where other ink dots are not formed. can be done. Therefore, in this example, the clear ink is ejected, for example, to the ejection position of the isolated color ink dot or ejection positions in the vicinity thereof, and the total amount of ink in the vicinity of the ejection position of the isolated color ink dot is calculated. preferably increased.
- the printing unit 14 ejects color ink and clear ink from inkjet heads for color ink and clear ink to ejection positions set according to the printing resolution. .
- the printing unit 14 ejects the clear ink so that the area including the plurality of ejection positions is continuously covered with the color ink and the clear ink.
- continuous coverage of a range including a plurality of ejection positions with color ink and clear ink for example, a plurality of ink dots in contact with each other on the transfer medium are arranged in a range including a plurality of ejection positions. It can be considered that
- the ejection position where the color ink is ejected from the inkjet head for color ink is defined as the colored ejection position.
- a colored ejection position where the adjacent ejection position is not a colored ejection position is defined as an isolated ejection position.
- the low gradation portion in the image can be considered, for example, as an area including isolated ejection positions.
- the clear ink is supplied from the inkjet head for clear ink to at least a part of the isolated ejection positions in the low gradation area or to the ejection positions around the isolated ejection positions. It can be thought of as ejecting.
- the printing unit 14 ejects the clear ink in this manner, so that, for example, at least in the vicinity of the isolated ejection position, the range including a plurality of ejection positions including the isolated ejection position is filled with the color ink and the clear ink.
- Printing is performed on a transfer medium so that it is connected by ink.
- the operation of ejecting clear ink from the inkjet head for clear ink to the ejection positions around the isolated ejection position in the printing unit 14 for example, at least part of the ejection positions where the color ink is not ejected It can be considered as an operation of ejecting clear ink from an inkjet head for clear ink.
- a plurality of color ink dots at different isolated ejection positions may be connected by clear ink dots.
- the hot-melt resin powder can more appropriately adhere to the vicinity of the isolated ejection position.
- the usage and usage of the clear ink in this example differ from the usage and usage of the white ink in the conventional configuration in various respects. More specifically, when performing color printing with an inkjet method, when a layer of white ink is formed on top of a layer of color ink, the layer of white ink is color representation (color reproduction) by the subtractive color mixing method. , it acts as a background that reflects light. In addition, when hot-melt resin powder is used for transfer, the white ink layer plays a greater role as a concealing layer that conceals the base color of the transfer medium onto which the image is transferred. In addition, due to the characteristics of the white ink layer such as these, the white ink layer is usually formed in an area including the entire image drawn with color inks.
- the clear ink used in this example since it is a translucent ink, even if a layer of clear ink is formed, it is usually used as a background layer that reflects light, or as a base layer of the transfer medium. It does not function as a color hiding layer. Further, as can be understood from the above description and the like, in this example, the purpose of using clear ink can be achieved even if the clear ink is ejected only on part of the image drawn with color ink. Also, unlike the case of forming a layer of white ink that functions as a masking layer, when clear ink is used as in this example, inks other than color inks may be excessively conspicuous on the transfer medium. do not have.
- the amount of clear ink ejected to each position on the transfer medium may be varied according to, for example, the amount of color ink ejected to each position. good.
- the amount of color ink ejected (print amount) to an area including each pixel on the transfer medium is equal to or less than a predetermined amount (X%), clear ink is ejected to that area to replace the insufficient ink. Compensation (supplementation) of the amount (liquid amount) can be considered.
- the total ejection amount (printing amount) of color ink and clear ink onto an area including each pixel on the transfer medium should not exceed another predetermined amount (Y%, Y>X). Conceivable.
- white ink for example, if the amount of white ink ejected to each position on the transfer medium is varied as described above, white ink will land intermittently between the color inks. etc. can be considered.
- the ink dots In order to make the hot-melt resin powder more likely to adhere to the clear ink dots formed on the transfer medium by ejecting the clear ink onto the transfer medium from the printing unit 14, for example, the ink dots It can also be considered that flattening and spreading is preferable. In this case, it is conceivable to adjust how the clear ink dots are spread during the operation executed in the printing system 10 . With this configuration, for example, it is possible to appropriately adjust the size of the clear ink dots. Further, in this case, the operation of adjusting the spread of the clear ink dots can be considered, for example, an adjustment stage operation of adjusting the spread of the clear ink dots formed on the transfer medium by the printing unit 14. can.
- the adjustment stage can also be considered as, for example, a stage of adjusting the flattening of ink dots (leveling adjustment). Further, the operation in the adjustment stage can also be considered, for example, as the operation in the leveling stage for flattening the ink dots. Adjustment in the adjustment stage may be performed, for example, before the stage of printing on the transfer medium in the printing unit 14 (printing stage). Further, for example, after printing on the transfer medium in the printing unit 14, the operation in the adjustment stage may be performed as necessary.
- the image is printed on the transfer medium by the printing unit 14 under the preset first printing conditions. Then, based on the result of the printing, for example, it is determined whether or not the spread of clear ink dots (dot gain) is insufficient. Then, for example, when it is determined that the spread of dots is insufficient, a second condition different from the first printing condition is selected as a printing condition for causing the printing unit 14 to print in the printing stage. Also, in this case, as the second condition, for example, a condition in which the clear ink dots spread more is selected.
- the dots of the clear ink can be flattened more appropriately.
- the hot-melt resin powder can more appropriately adhere to the position where the clear ink has been ejected.
- the second printing condition for example, it is conceivable to use a printing condition that makes the printing speed slower than that of the first printing condition.
- a printing condition for slowing down the printing speed for example, a condition for increasing the number of printing passes may be used.
- the number of passes can be considered, for example, as the number of main scanning operations performed on the same position on the printing target.
- the number of passes is increased, for example, it can be considered that the amount of relative movement of the inkjet head in one sub-scanning operation is reduced, thereby slowing down the transport speed of the medium.
- the printing speed under the first printing condition may be, for example, the normal printing speed (standard printing speed) of the printing unit 14 .
- the printing speed under the second printing condition can be considered as, for example, a printing speed slower than the normal printing speed.
- selecting the second printing condition can be considered as selecting a printing speed slower than a specific printing speed corresponding to the printing speed under the first printing condition, for example. can.
- the second printing conditions may be different from the first printing conditions in these points of view, for example.
- the printing conditions may be changed by changing the heating temperature of the heater.
- a heater that heats the transfer medium.
- the drying speed of the ink is slowed down, and the clear ink dot spreads. can be made larger.
- the printing unit 14 configured to print while conveying the medium
- the heating temperature of the after-heater which is a heater arranged downstream of the inkjet head in the conveying direction
- the afterheater may be divided into a plurality of areas (for example, 2 to 3 areas) to adjust the temperature.
- the plurality of areas may be divided into, for example, an area closer to the inkjet head in the transport direction and an area further away from the inkjet head.
- the spread of ink dots can be adjusted in more detail.
- a heater for heating the inkjet head may be used.
- the viscosity of the ink before ejection can be changed by changing the heating temperature of this heater.
- the heating temperature under the second printing condition higher than the heating temperature under the first printing condition, the viscosity of the ejected ink is lowered, and the ink is spread on the transfer medium. It can be made more spreadable.
- the present invention can be suitably used, for example, in printing methods.
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Abstract
Description
0と同一又は同様の特徴を有してよい。
上記においても説明をしたように、本例の印刷システム10では、印刷部14において転写媒体に対して印刷した画像を被転写媒体へ転写する。また、この場合、まず、印刷データ準備部12において、転写媒体へ印刷する画像を示す画像データに基づき、印刷部14へ供給する印刷データを生成する(S102)。印刷データ準備部12において印刷データを生成する動作については、後に更に詳しく説明をする。また、この場合、印刷部14では、印刷データ準備部12から供給される印刷データに基づき、転写媒体へ画像を印刷する(S104)。本例において、ステップS104の動作は、印刷段階の動作の一例である。ステップS104において、印刷部14は、ヘッド部102におけるインクジェットヘッド202y~202kから、転写媒体の少なくとも一部へカラーインクを吐出する。そして、転写媒体においてインクジェットヘッド202y~202kのいずれかからカラーインクが吐出される領域の少なくとも一部に対し、インクジェットヘッド202tからクリアインクを更に吐出する。本例においてクリアインクを用いる理由や、クリアインクの吐出の仕方等については、後に更に詳しく説明をする。
Claims (10)
- 転写媒体に印刷した画像を被転写媒体へ転写することで、前記被転写媒体に前記画像を描く印刷方法であって、
インクジェット方式で印刷を行う印刷装置によって前記転写媒体へ前記画像を印刷する印刷段階と、
加熱によって軟化する樹脂を含む粉末であるホットメルト樹脂粉末を前記画像が印刷されている前記転写媒体に付着させるホットメルト樹脂付着段階と、
前記ホットメルト樹脂粉末が付着している前記転写媒体を加熱し、前記ホットメルト樹脂粉末が加熱によって軟化することで形成される樹脂部であるホットメルト樹脂部を前記被転写媒体に付着させることで、前記転写媒体から前記被転写媒体へ前記画像を転写する転写段階と、を備え、
前記印刷装置は、
有色の色を示す色材を含むインクである有色インクを吐出するインクジェットヘッドである有色インク用ヘッドと、
無色で透光性のインクであるクリアインクを吐出するインクジェットヘッドであるクリアインク用ヘッドと、を備え、
前記転写媒体において、前記有色インク用ヘッドから前記有色インクが吐出される領域の少なくとも一部に対し、前記印刷段階において、前記クリアインク用ヘッドから前記クリアインクを更に吐出することを特徴とする印刷方法。 - 前記転写段階において、前記転写媒体に付着している前記色材の少なくとも一部を前記ホットメルト樹脂部の少なくとも一部と共に前記被転写媒体へ移動させることで、前記転写媒体から前記被転写媒体へ前記画像を転写し、
前記転写媒体において前記有色インク用ヘッドから前記有色インクが吐出される領域を画像表現領域と定義し、
単位面積あたりに吐出される前記有色インクの量が予め設定された基準量よりも少ない領域を少量インク領域と定義し、
前記転写段階において前記転写媒体から前記被転写媒体へ移動する前記色材の割合を転写率と定義した場合、
前記印刷段階において、前記印刷装置により、前記画像表現領域のうちの前記少量インク領域の少なくとも一部に対して、前記クリアインクを吐出することで、
前記少量インク領域の少なくとも一部における前記転写率について、前記クリアインクを吐出しない場合よりも高めることを特徴とする請求項1に記載の印刷方法。 - 前記印刷段階において、前記少量インク領域の少なくとも一部に対して前記クリアインクを吐出することで、前記クリアインクを吐出した位置に対し、前記ホットメルト樹脂付着段階で付着する前記ホットメルト樹脂粉末の量について、前記クリアインクを吐出しない場合よりも多くすることを特徴とする請求項2に記載の印刷方法。
- 前記画像表現領域のうち、単位面積あたりに吐出される前記有色インクの量が前記基準量よりも大きな所定の量よりも多くなる領域を非少量インク領域と定義し、
前記転写媒体の各位置に対して吐出する前記クリアインクの単位面積あたりの量をクリア吐出量と定義した場合、
前記印刷段階において、前記少量インク領域での前記クリア吐出量が前記非少量インク領域での前記クリア吐出量よりも大きくなるように、前記クリア吐出量について、単位面積あたりに吐出される前記有色インクの量に応じて異ならせることを特徴とする請求項2又は3に記載の印刷方法。 - 前記印刷段階において、単位面積あたりに吐出される前記有色インクの量が予め設定された上限量よりも多くなる位置に対しては、前記クリアインクを吐出しないことを特徴とする請求項4に記載の印刷方法。
- 前記印刷装置は、印刷の解像度に応じて設定される吐出位置に対し、前記有色インク用ヘッド及び前記クリアインク用ヘッドから、前記有色インク及び前記クリアインクを吐出し、
前記有色インク用ヘッドから前記有色インクが吐出される前記吐出位置を有色吐出位置と定義し、隣接する前記吐出位置が前記有色吐出位置にならない前記有色吐出位置を孤立吐出位置と定義した場合、
前記少量インク領域は、前記孤立吐出位置を含む領域であり、
前記印刷段階において、前記少量インク領域にある少なくとも一部の前記孤立吐出位置、又は、当該孤立吐出位置の周辺の前記吐出位置へ前記クリアインク用ヘッドから前記クリアインクを吐出することで、少なくとも当該孤立吐出位置の近辺において、前記孤立吐出位置を含む複数の前記吐出位置を含む範囲が前記有色インク及び前記クリアインクによってつながるように、前記転写媒体に対して印刷を行うことを特徴とする請求項2から5のいずれかに記載の印刷方法。 - 前記印刷段階において前記転写媒体上に形成される前記クリアインクのドットの広がり方を調整する調整段階を更に備えることを特徴とする請求項1から6のいずれかに記載の印刷方法。
- 前記調整段階において、予め設定された第1の印刷条件で前記印刷装置によって前記転写媒体へ前記画像を印刷した結果に基づき、前記クリアインクのドットの広がり方が不足しているか否かを判定し、前記ドットの広がり方が不足していると判定した場合に、前記印刷段階で前記印刷装置に印刷を行わせる印刷条件として、前記第1の印刷条件と異なる条件であり、前記クリアインクのドットの広がり方がより大きくなる第2の印刷条件を選択することを特徴とする請求項7に記載の印刷方法。
- 転写媒体に印刷した画像を被転写媒体へ転写することで前記被転写媒体に前記画像を描く印刷システムであって、
インクジェット方式で前記転写媒体へ印刷を行う印刷装置と、
前記転写媒体から前記被転写媒体へ、画像を転写する転写部と、を備え、
前記転写部は、加熱によって軟化する樹脂を含む粉末であるホットメルト樹脂粉末を前記画像が印刷されている前記転写媒体に付着させた状態で、前記ホットメルト樹脂粉末が付着している前記転写媒体を加熱し、前記ホットメルト樹脂粉末が加熱によって軟化することで形成される樹脂部であるホットメルト樹脂部を前記被転写媒体に付着させることで、前記転写媒体から前記被転写媒体へ前記画像を転写し、
前記印刷装置は、
有色の色を示す色材を含むインクである有色インクを吐出するインクジェットヘッドである有色インク用ヘッドと、
無色で透光性のインクであるクリアインクを吐出するインクジェットヘッドであるクリアインク用ヘッドと、を有し、
前記転写媒体において前記有色インク用ヘッドから前記有色インクが吐出される領域の少なくとも一部に対し、前記クリアインク用ヘッドから前記クリアインクを更に吐出することを特徴とする印刷システム。 - 転写媒体に印刷した画像を被転写媒体へ転写することで前記被転写媒体に前記画像を描く印刷システムにおいてインクジェット方式で前記転写媒体へ印刷を行う印刷装置であって、
有色の色を示す色材を含むインクである有色インクを吐出するインクジェットヘッドである有色インク用ヘッドと、
無色で透光性のインクであるクリアインクを吐出するインクジェットヘッドであるクリアインク用ヘッドと、を備え、
前記転写媒体から前記被転写媒体への前記画像の転写は、加熱によって軟化する樹脂を含む粉末であるホットメルト樹脂粉末を前記画像が印刷されている前記転写媒体に付着させた状態で、前記ホットメルト樹脂粉末が付着している前記転写媒体を加熱し、前記ホットメルト樹脂粉末が加熱によって軟化することで形成される樹脂部であるホットメルト樹脂部を前記被転写媒体に付着させることで、前記転写媒体から前記被転写媒体へ前記画像を転写するものであり、
前記転写媒体において、前記有色インク用ヘッドから前記有色インクが吐出される領域の少なくとも一部に対し、前記クリアインク用ヘッドから前記クリアインクを更に吐出し、かつ、前記転写媒体の各位置に対して吐出する前記クリアインクの単位面積あたりの量であるクリア吐出量について、単位面積あたりに吐出される前記有色インクの量に応じて異ならせることを特徴とする印刷装置。
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JPH04308284A (ja) * | 1991-04-02 | 1992-10-30 | Riso Kagaku Corp | 昇華捺染方法 |
WO2004069543A1 (ja) * | 2003-02-04 | 2004-08-19 | Konica Minolta Holdings, Inc. | インクジェット記録方法及びインクジェットプリンタ |
JP2019171840A (ja) | 2018-01-31 | 2019-10-10 | 株式会社クイックアート | 転写印刷方法 |
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JPH04308284A (ja) * | 1991-04-02 | 1992-10-30 | Riso Kagaku Corp | 昇華捺染方法 |
WO2004069543A1 (ja) * | 2003-02-04 | 2004-08-19 | Konica Minolta Holdings, Inc. | インクジェット記録方法及びインクジェットプリンタ |
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