WO2011122071A1

WO2011122071A1 - Printer and printing method

Info

Publication number: WO2011122071A1
Application number: PCT/JP2011/050836
Authority: WO
Inventors: 大塚　秀一
Original assignee: 富士フイルム株式会社
Priority date: 2010-03-31
Filing date: 2011-01-19
Publication date: 2011-10-06
Also published as: EP2554732A1; EP2554732A4; CN102822407A; JP2011212852A; JP5620135B2

Abstract

Provided is a printer capable of coloring an object to be printed configured from a plurality of regions having different coloring properties from each other with reproduction target color. Ink droplets for coloring are supplied to corresponding regions from inkjet heads (4, 5) respectively corresponding to a ground texture region and a raised texture region of an object to be printed (P) to color the object to be printed (P) with reproduction target color.

Description

Printing apparatus and printing method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus and a printing method for printing on a printing material, and more particularly to a printing device and a printing method for printing on a printing material having a plurality of regions having different color development characteristics.

Cloth and woven fabrics are widely used in daily necessities, and their forms and materials are diversified. There is a demand for printing on such diversified fabrics to produce the same color as the reproduction target color.
Examples of diversified fabrics include, for example, a raised fabric in which the surface of the fabric is fluffed, a pile fabric in which a pile is woven on the surface of the fabric, and a hook-and-loop fastener in which a resin hook / loop portion is attached to the fabric. and so on. In the printed matter having a plurality of different regions such as the raised portion and the ground texture, the pile portion and the ground texture, the hook / loop portion of the fastener and the ground texture, the ink landing rate and the ink coloring for each region. Since the rate and the like are different, even if printing is performed under the same printing conditions, different colors are displayed in each region. In addition, since the plurality of regions are arranged very close to each other or in the thickness direction, it is difficult to control the coloring of a desired region by controlling the droplet ejection position in, for example, ink jet printing. . In order to solve such a problem, a method is adopted in which the color is developed in the same manner as the reproduction target color by changing the printing conditions corresponding to the color development characteristics of each region.

For example, Patent Document 1 proposes that the tip cross-section of the raised tissue is uniformly colored by changing the diameter of the nozzle according to the thickness and length of the raised tissue of the raised fabric and ejecting ink. ing.

Japanese Patent No. 2799595

However, even when the coloring of only the raised tissue is made uniform, when printing is performed on a printed material having a plurality of different coloring characteristics, such as a raised fabric, a pile fabric, and a fabric having a fastener, It is difficult to cause each region to be colored in the same manner as the reproduction target color.

The present invention has been made to solve such a conventional problem, and a printing apparatus and a printing method capable of coloring a printed material composed of a plurality of regions having different color development characteristics to a reproduction target color. The purpose is to provide.

In order to achieve the above object, a printing apparatus according to the present invention is a printing apparatus that performs printing on a printed material having a plurality of areas having different color development characteristics to develop a reproduction target color. A plurality of droplet supply devices that supply droplets for preferentially developing colors in a plurality of areas of the product, and a plurality of droplet supply devices that supply the printed material to the reproduction target color, respectively. A calculation unit that calculates supply conditions of droplets to be driven, a drive unit that drives the plurality of droplet supply devices, and a control unit that controls the drive unit based on the supply conditions calculated by the calculation unit It is what you have.

Here, the plurality of droplet supply devices may include a first inkjet device that supplies ink droplets by an inkjet method. The plurality of droplet supply devices may include a second inkjet device that supplies ink droplets by an inkjet method in a direction different from the first inkjet device. The plurality of droplet supply devices may include an atomizer that supplies atomized ink droplets. The plurality of droplet supply devices may include a hydrophilizing liquid supply device that supplies droplets of a hydrophilizing liquid that hydrophilizes the printing material. In addition, the plurality of droplet supply devices include a first atomizer that charges and supplies the atomized ink droplets, and a second atom that supplies the atomized ink droplets without charging. Can also be included.

In addition, the calculation unit may supply droplets supplied from the droplet supply device based on information on each area of the substrate and information on the reproduction target color to be printed on the substrate. Can be computed.
Further, the image forming apparatus further includes a database that stores in advance color information when the respective regions of the printing object are colored by the corresponding droplet supply devices, and the calculation unit includes each of the printing objects to be printed. Based on the information on the area and the information on the reproduction target color, the color development information is extracted from the database so that each area of the printed material is colored in the reproduction target color, and is supplied from the droplet supply device. The droplet supply conditions may be calculated.

In addition, a measuring device that measures the color of the printed material that is colored by supplying droplets from the plurality of droplet supply devices, and a result of measuring the color of the printed material by the measuring device are input to the arithmetic unit. A measurement value input unit, and the calculation unit calculates a droplet supply condition from each droplet supply device based on the result of color measurement of the printing object and information on the reproduction target color The control unit may control the driving unit so that the droplet is supplied under the supply condition corrected by the calculation unit.

The printing apparatus according to the present invention is a printing apparatus that performs printing on a printed material including a plurality of regions having different color development characteristics and develops a reproduction target color, and includes a plurality of regions of the printed material. Among them, a corona treatment device that hydrophilizes at least one region by corona treatment, an ink jet device that supplies ink droplets to the printed material by an ink jet method, and controls the corona treatment device and the ink jet device to control the object. And an ink supply device that develops the printed matter in the reproduction target color.

Here, the plurality of areas of the substrate to be printed may include an area composed of a raised tissue. Further, the plurality of areas of the substrate to be printed may include an area composed of a pile structure. Further, the plurality of areas of the substrate may include an area including fastener hooks and loops.

Further, the printing method according to the present invention is a printing method for printing on a printed material having a plurality of areas having different color development characteristics to develop a target color for reproduction, wherein the printed material is applied to the plurality of areas of the printed material. A droplet for color development is supplied from a droplet supply device that supplies ink predominantly, and the printed material is colored to the reproduction target color.
Here, there is provided a printing method for performing printing on a printing material having a plurality of areas having different color development characteristics to develop a reproduction target color, wherein at least one area of the plurality of areas of the printing material is corona. It becomes hydrophilic by the treatment, and ink droplets can be supplied to the substrate to be printed by the ink jet method to develop the reproduction target color.

According to the present invention, it is possible to color a printed material including a plurality of areas having different color development characteristics to a reproduction target color.

1 is a block diagram illustrating a configuration of a printing apparatus according to a first embodiment of the present invention. It is a block diagram which shows the information stored in printing characteristic DB. FIG. 5 is a block diagram illustrating a configuration of a printing apparatus according to a second embodiment. FIG. 6 is a block diagram illustrating a partial configuration of a printing apparatus according to a third embodiment. FIG. 6 is a block diagram illustrating a partial configuration of a printing apparatus according to a fourth embodiment. FIG. 10 is a block diagram illustrating a partial configuration of a printing apparatus according to a modification of the fourth embodiment. FIG. 10 is a block diagram illustrating a partial configuration of a printing apparatus according to another modification of the fourth embodiment. FIG. 10 is a block diagram illustrating a partial configuration of a printing apparatus according to a fifth embodiment. FIG. 10 is a block diagram illustrating a partial configuration of a printing apparatus according to a sixth embodiment. FIG. 10 is a block diagram illustrating a partial configuration of a printing apparatus according to a modified example of Embodiment 6. FIG. 10 is a block diagram illustrating a partial configuration of a printing apparatus according to another modification of the sixth embodiment.

Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

Embodiment 1
FIG. 1 shows the configuration of a printing apparatus according to Embodiment 1 of the present invention. The printing apparatus includes a supply condition calculation unit 1, a print characteristic database (DB) 2, a control unit 9, a print drive unit 3, and

inkjet heads

4 and 5.

In the supply condition calculation unit 1, information on the printed material P composed of areas of the ground texture and raised tissue areas having different color development characteristics and information on the reproduction target color of the printed image to be printed on the printed material P are stored. Input as input data by an operator. The information on the printing material P includes information on the material, the fibril diameter, the number of fibers, and the like in each region of the printing material P. The information on the reproduction target color includes information on the chromaticity of the reproduction target color in each area of the printing material P.
The supply condition calculation unit 1 is connected to the print characteristic DB2. The supply condition calculation unit 1 searches the print characteristic DB 2 based on the information on the printing medium P and the information on the reproduction target color, and the inkjet head 4 showing the color development closest to the reproduction target color for each area of the printing medium P and 5 ink types and ink supply parameters are extracted. Here, the ink supply parameters include the voltage, frequency, waveform, etc. output to the inkjet heads 4 and 5. Further, the supply condition calculation unit 1 calculates the time point at which ink is ejected from each of the inkjet heads 4 and 5 based on the moving speed of the printing material P.

The supply condition calculation unit 1 is connected to the control unit 9. The control unit 9 inputs an electric signal indicating the ink type and ink supply parameter extracted by the supply condition calculation unit 1 from the inkjet heads 4 and 5 to the print driving unit 3 at the time when the ink should be ejected. Controls printing on the substrate P.
The control unit 9 is connected to the print driving unit 3. The print driving unit 3 drives the inkjet heads 4 and 5 according to the electric signal input from the control unit 9.
The print driver 3 is connected to the inkjet heads 4 and 5. The ink jet heads 4 and 5 are so-called ink jet type print heads that eject ink using, for example, expansion and contraction of a piezoelectric element, and eject ink of four types of inks Y, M, C, and K. The ink-jet head 4 is for landing ink on the printing material P from the vertical direction. For example, the ink jet head 4 can print on both the ground tissue region and the raised tissue region of the substrate P, but can print on the ground tissue region more preferentially than the raised tissue region. On the other hand, the ink-jet head 5 is for landing ink on the printing material P from an oblique direction. For example, the ink-jet head 5 preferentially develops a raised tissue region of the printing material P.

In addition, a processing device is disposed downstream of the inkjet heads 4 and 5 with respect to the direction of movement of the printing material P, so that the color material in the ink is deposited on the printing material P first. For example, when the printing material P is a polyester fiber, a disperse dye is used as a color material, and a heating device 6, a reduction cleaning device 7, and a drying device 8 are sequentially arranged as a processing device. The heating device 6 performs a heat treatment of the printing material P that has been printed. The reduction cleaning device 7 is for performing reduction cleaning of the printing material P. For example, a reduction cleaning aid such as hydrosulfite is used. The drying device 8 is for drying the printing material P.
Further, when the substrate P is silk, cotton, or wool fiber other than polyester, a suitable color material is used and a suitable processing apparatus is disposed.

FIG. 2 shows information stored in the print characteristic DB2. In the print characteristic DB 2, color development information corresponding to respective combinations of a plurality of ink types, a plurality of ink supply parameters, and a plurality of print object region types is stored in advance for the inkjet heads 4 and 5. ing. The supply condition calculation unit 1 selects color development information indicating color development closest to the reproduction target color for each region of the printing material P, and a combination of ink types and ink supply parameters of the inkjet heads 4 and 5 that satisfy the color development information. To extract. As the color development information, ink landing rate, color development rate, and the like can be adopted. Here, the landing rate is indicated by the ratio between the amount of ink ejected when ink is ejected onto each area of the printing object and the amount of color material captured in each area of the printing object. Further, the color development rate is the optical reflectance or K / S or the like indicating the degree of color development in each area of the printing material when ink is ejected in a unit amount in each area of the printing material. . In the case of K / S, for example, when color is generated with one color ink, it is expressed by the following formula (1). Further, for example, when a plurality of inks such as four colors are mixed to generate a color, it is expressed by the following formula (2).

Kubelka Munch has shown that K / S has the following properties.
K / S = (1-Rc) ² / 2Rc (1)
(K / S) mix
= Jy (K / S) y + Jm (K / S) m + Jc (K / S) c + Jk (K / S) k (2)

Equation (1) shows the relationship among the absorption intensity K by the color material, the light scattering intensity S from the printing material, and the reflectance Rc at each wavelength. In Equation (2), (K / S) mix represents K / S of an area where a plurality of color materials are printed and mixed, and (K / S) y, (K / S) m, (K / S) c and (K / S) k respectively indicate K / S when unit amounts of the four color materials are adhered, and Jy, Jm, Jc and Jk respectively indicate the four color materials on the printed material. Indicates the amount of adhesion. That is, K / S when a plurality of color materials are mixed is represented by a linear sum corresponding to the adhesion amount of K / S of each color material. Using this linearity, the color development when an arbitrary amount of each color material adheres is obtained by calculation.
Further, in this specification, “ink” is defined as a color material dissolved or dispersed at a predetermined concentration. Furthermore, the “coloring material” is a material that develops color and includes dyes, pigments, pigments, paints, and the like.

Next, the operation of the printing apparatus shown in FIG. 1 will be described.

First, the supply condition calculation unit 1 searches the print characteristic DB 2 based on the information on the printing material P input by the operator and the information on the reproduction target color of the print image to be printed on the printing material P. The supply condition calculation unit 1 searches for information indicating the same type as each region of the ground texture and the raised tissue on the printed material P from the information on the region type of the printed material in the printing characteristic DB 2.
Subsequently, the supply condition calculation unit 1 converts the reproduction target of each area of the ground texture and the raised tissue of the printing material P into a coloring information target indicating coloring. The color development information may be the amount of landing of the YMCK color material in the ink on each area of the ground texture and the raised tissue. The color development information may be a colorimetric value such as L * a * b * obtained from the optical reflectance of each region of the ground tissue and the raised tissue.
The supply condition calculation unit 1 uses the data of the print characteristic DB 2 and uses all the ink types (YMCK × 2 = 8 types) of the inkjet heads 4 and 5 in which the color development information of each area of the ground tissue and the raised tissue becomes the color development information target. ) Ink supply parameters.
The supply condition calculation unit 1 uses the data of the print characteristic DB 2 to predict color generation when ink supply parameters for all ink types of the ink jet heads 4 and 5 are given, calculates color development information, and the color development information is colored. A combination of ink supply parameters that can be an information target can also be obtained by an optimization method. Specifically, K / S is used using the Kubelka-Munk formula to determine the relationship between the print amount and color development information, and optimization methods such as linear programming by the simplex method, successive approximation method, genetic method, etc. Can be used. Further, the supply condition calculation unit 1 can obtain a plurality of combinations of ink supply parameters close to the color reproduction target in the print characteristic DB 2 and obtain an optimum ink supply parameter by interpolation.

Subsequently, the supply condition calculation unit 1 covers the position where the ink from the inkjet head 4 and the inkjet head 5 lands on the printed material P based on the moving speed of the printed material P by a printed material moving means (not shown). The point in time when the ground tissue region and the raised tissue region of the printed matter P arrives is calculated.

The ink type and ink supply parameters for each area of the printing material P extracted by the supply condition calculation unit 1 in this way and the time point at which the ink calculated by the supply condition calculation unit 1 should be ejected are sent to the control unit 9. Is output. When the control unit 9 outputs the ink supply parameter to the print drive unit 3 at the time when the supply condition calculation unit 1 should eject ink of each ink type, the print drive unit 3 outputs a drive signal corresponding to the ink supply parameter. Are output to the head portions of the inkjet head 4 and the inkjet head 5 corresponding to the ink type, respectively, and ink is ejected onto each region of the printing material P.

As a result, it is possible to color the printed material P including the ground tissue region and the raised tissue region having different color development characteristics in the same manner as the reproduction target color.

In conjunction with the movement of the printing material P, ink ejection is repeatedly performed for all the regions with the ink supply parameters extracted for each region of the printing material P. The printed object P printed is heated by the heating device 6, then reduced and cleaned by the reduction cleaning device 7, and dried by the drying device 8. The process ends when the printing object P on which all the print images input to the supply condition calculation unit 1 have been printed is subjected to the heating process, the drying cleaning process, and the drying process.

According to the printing apparatus of this embodiment, the inkjet head 4 that can print predominantly in the area of the ground tissue and the inkjet head 5 that can print predominantly in the area of the raised tissue are provided, and the inkjet head 4 and the inkjet head 5 are controlled. By printing on the corresponding areas of the printing material P, the printing material P composed of the ground texture area and the raised tissue area having different coloring characteristics can be developed in the same manner as the reproduction target color.

Embodiment 2
FIG. 3 shows the configuration of the printing apparatus according to the second embodiment. In the second embodiment, after printing on the printing material P, the optical characteristics of the printing material P are measured, and the measurement result is corrected and printed so as to realize the same color as the reproduction target color. The printing apparatus according to the present embodiment is the printing apparatus according to the first embodiment illustrated in FIG. 1, in which measuring

devices

20 and 21 are arranged on the downstream side of the drying device 8 with respect to the traveling direction of the printing material P. , 21 is connected to a print result measurement value input unit 22, and the print result measurement value input unit 22 is connected to the supply condition calculation unit 1.
The measuring

devices

20 and 21 are for measuring the optical characteristics from the front side and the back side of the printing material P and measuring the color development amount, respectively, and calibrated with a diffusion colorimeter or diffusion colorimeter having an integrating sphere. It consists of an optical sensor. The printing result measurement value input unit 22 feeds back the printing result of the printing material P by inputting the measurement value obtained in the measuring

devices

20 and 21 to the supply condition calculation unit 1. The supply condition calculation unit 1 sets the supply condition value of the ink to be ejected, corrected so that the measurement value input from the print result measurement value input unit 22 realizes the same color as the reproduction target color. This is obtained for each area.

First, the supply condition calculation unit 1 searches the print characteristic DB 2 based on the information on the printing material P input in the same manner as in the first embodiment and the color development information of the print image to be printed on the printing material P. The supply condition calculation unit 1 selects color development information indicating color development closest to the reproduction target color for each region of the printing material P, and sets the ink types and ink supply parameters of the inkjet heads 4 and 5 that satisfy the color development information. Extract combinations. Further, the supply condition calculation unit 1 calculates the time point at which ink is ejected from the inkjet head 4 and the inkjet head 5 based on the moving speed of the printing material P. The ink supply parameters for each area of the printing material P extracted by the supply condition calculation unit 1 and the time point at which the ink calculated by the supply condition calculation unit 1 is ejected are input to the control unit 9.
When the control unit 9 outputs the input ink supply parameters to the print drive unit 3 at the time when each ink is to be ejected, the print drive unit 3 outputs drive signals corresponding to the ink supply parameters to the inkjet head 4 and the inkjet head. 5 is output to each head portion, and ink is ejected onto each area of the substrate P. The printed object P printed is heated by the heating device 6, then reduced and cleaned by the reduction cleaning device 7, and dried by the drying device 8. The dried printing material P is measured by the measuring

devices

20 and 21 from the front side and the back side of the printing material P, and the measured values are input to the supply condition calculation unit 1 via the printing result measurement value input unit 22. Is done.
When the input measurement value is outside the allowable range of chromaticity of the reproduction target color, the supply condition calculation unit 1 makes the measurement value input from the print result measurement value input unit 22 match the chromaticity of the reproduction target color. In addition, the ink supply parameters of ink to be ejected from the head portions of the inkjet head 4 and the inkjet head 5 are respectively corrected. The ink supply parameters of the ink corrected by the supply condition calculation unit 1 are output to the control unit 9, and the control unit 9 drives each head unit of the inkjet head 4 and the inkjet head 5 by the print drive unit 3 based on the ink supply parameter. Is controlled, and printing is performed on the substrate P. When the correction does not fall within the allowable range of the chromaticity of the target color to be reproduced, it is preferable to repeat the above correction until it falls within the allowable range.

According to the second embodiment, since printing is performed again on the printing material P based on the ink supply parameter corrected by feeding back the result printed on the printing material P, the initial calculation accuracy is poor, or the ink, Even when the physical properties of the printing material P or the like change with time or in the environment, it is possible to effectively suppress the deviation or fluctuation of the color development amount.

The supply condition calculation unit 1 accumulates the ink supply parameter corrected by the feedback of the print result in the print characteristic DB 2 every time it is corrected, or is already stored in the print characteristic DB 2 by the corrected ink supply parameter. A learning function can be provided by updating the ink supply parameters. As described above, the accuracy of information stored in the print characteristic DB 2 can be increased by learning each time printing is repeated.

Embodiment 3
As shown in FIG. 4, in the printing apparatus according to the first or second embodiment, a color material ink atomizer 31 can be used instead of the inkjet head 5. The color material ink atomizer 31 performs printing by atomizing ink with ultrasonic waves, and supplies ink droplets having a small kinetic energy to the printing material P. For this reason, the color material ink atomizer 31 is suitable for printing an area of the printing material P in which the landing rate changes due to a difference in kinetic energy, for example, an area of the raised tissue of the printing material P. It is suitable for preferential color development. The ink jet head 4 is suitable for, for example, preferentially coloring the area of the ground structure of the printing material P.
The print characteristic DB2 corresponds to each combination of a plurality of ink types, a plurality of ink supply parameters, and a plurality of print object region types with respect to the inkjet head 4 and the color material ink atomizer 31. Coloring information is stored in advance. The printed material P is composed of a ground tissue region and a raised tissue region, and the raised tissue region is present on the lower surface of the printed material P in FIG.

In the same manner as in the first embodiment, the supply condition calculation unit 1 sets the ink types of the ink jet head 4 and the color material ink atomizer 31 so as to show the color development closest to the reproduction target color for each area of the printing material P. A combination with the ink supply parameter is extracted and calculated from the print characteristic DB2. The ink supply parameters for each area of the printing material P extracted by the supply condition calculation unit 1 are input to the control unit 9. When the control unit 9 outputs the input ink supply parameters to the print drive unit 3 at the time when each ink is to be ejected, the print drive unit 3 sends drive signals corresponding to the ink supply parameters to the inkjet head 4 and the color material. Each is output to the ink atomizer 31. In response to the output of the drive signal from the print drive unit 3, the ink jet head 4 supplies ink to the area of the ground structure of the printing object P, and the color material ink atomizer 31 inks the area of the raised tissue of the printing object P. Supply.

According to the printing apparatus of this embodiment, the inkjet head 4 and the color material ink atomizer 31 corresponding to the ground tissue region and the color material ink atomizer 31 corresponding to the raised tissue region are provided. By controlling the printing and printing on the areas of the printing material P corresponding to each, the printing material P composed of the ground tissue region and the raised tissue region having different color development characteristics is developed similarly to the reproduction target color. be able to.

Embodiment 4
As shown in FIG. 5, in the printing apparatus according to the first or second embodiment, an inkjet head 32 may be used instead of the inkjet head 5. The ink jet head 32 is disposed on the upstream side of the ink jet head 4 with respect to the moving direction of the printing material P, and the hydrophilic property is applied to the printing material P by ejecting a hydrophilic treatment liquid by an ink jet method. As described above, the ink jet head 32 drops the hydrophilization treatment liquid on an open area (an area where fibers are not densely organized) such as fastener hooks and loops, and improves the landing rate of ink. For this reason, the combined use of the inkjet heads 32 and 4 is suitable for, for example, printing the printing material P including fastener hooks and loops, and the use of the inkjet head 4 alone is, for example, the texture of the printing material P. This area is suitable for developing the target area in the reproduction target color. As the hydrophilic treatment liquid, a hydrophilic polymer compound such as gum arabic, guar gum, locust bin gum, shiraz gum, sodium alginate, carboxymethyl cellulose, sodium polyacrylate and the like are used together with a surfactant.
The print characteristics DB 2 includes combinations of a plurality of ink types, a plurality of ink supply parameters, a plurality of hydrophilization liquid supply parameters, and a plurality of print object region types for the inkjet heads 4 and 32. Coloring information corresponding to is stored in advance. Here, the hydrophilic liquid supply parameter includes a voltage, a frequency, a waveform, and the like output to the inkjet head 32. The substrate P is composed of a ground texture area and fastener hook / loop areas.
The hydrophilic treatment liquid itself by the ink jet head 32 does not cause color development, but the landing ratio of the coloring material to the fastener hook / loop region by the ink droplets of the ink jet head 4 is increased. The print characteristic DB2 includes a combination of the hydrophilizing liquid supply parameter and the YMCK ink supply parameter, and a change in the landing ratio of the coloring material to the fastener hook / loop region due to the combined droplet ejection.

In the same manner as in the first embodiment, the supply condition calculation unit 1 searches the print characteristic DB 2 based on the information on the printing material P and the information on the reproduction target color. The supply condition calculation unit 1 searches for information indicating the same type as the ground texture and the fastener hook / loop regions on the printed material P from the information on the region type of the printed material in the printing characteristic DB 2. Subsequently, the supply condition calculation unit 1 selects color development information indicating color development closest to the reproduction target color for the area of the texture of the printing material P, and the ink type and ink supply parameters of the inkjet head 4 that satisfy the color development information. And combinations are extracted. Similarly, the supply condition calculation unit 1 selects color development information indicating color development closest to the reproduction target color for the fastener hook / loop region of the printing material P, and supplies the hydrophilic liquid of the inkjet head 32 that satisfies the color development information. A combination of the parameter, the ink type of the inkjet head 4 and the ink supply parameter of the inkjet head 4 is extracted. The hydrophilization liquid supply parameter and the ink supply parameter extracted by the supply condition calculation unit 1 are input to the control unit 9. When the control unit 9 outputs the input hydrophilization liquid supply parameter or ink supply parameter to the print drive unit 3 at the time when the hydrophilization liquid or ink should be ejected, the print drive unit 3 displays the hydrophilic liquid supply parameter. Alternatively, drive signals corresponding to the ink supply parameters are output to the inkjet head 32 or the head portion of the inkjet head 4, respectively. As a result, after the hydrophilic treatment liquid is supplied from the inkjet head 32 to the fastener hook / loop region of the printing material P, the ink is supplied from the inkjet head 4 and also to the ground tissue region of the printing material P. Ink is supplied from the inkjet head 4.

According to the printing apparatus of the present embodiment, the printing object P is controlled by controlling the combined use of the inkjet head 4 that can print predominantly in the area of the ground texture and the inkjet head 32 that improves the printing ratio of the fastener hook / loop area. By printing each of these areas, it is possible to develop the printed material P composed of areas of the ground texture having different color development characteristics and areas of the fastener hook and loop in the same manner as the reproduction target color.
In the present embodiment, the ink jet head 4 is assumed to be an ink mainly composed of water and uses a hydrophilizing liquid. However, even in the case of a non-aqueous ink, a liquid having a high affinity with the ink used can be used.
In the present embodiment, the method of performing the hydrophilic treatment of the printing material P with the hydrophilic liquid has been described. However, instead of the inkjet head 32, a corona treatment device or a plasma irradiation device that modifies the surface of the printing material P. May be used. FIG. 6 shows a printing apparatus using a corona treatment device 41 instead of the inkjet head 32. The corona treatment device 41 is disposed on the upstream side of the ink jet head 4 with respect to the moving direction of the printing material P, and a discharge electrode that applies a voltage from the power supply device 42 to generate a corona discharge. 43. The corona treatment device 41 generates corona discharge between the discharge electrodes 43, so that at least one of the plurality of regions of the printing material P is made hydrophilic by corona treatment, and the ink landing ratio is improved. Let Furthermore, in order to increase the hydrophilic effect of the printing material P, the corona treatment device 41 and the inkjet head 32 may be used in the hydrophilic treatment.
Further, as shown in FIG. 7, in the printing apparatus of the present embodiment, an inkjet head 10 for ejecting the penetrating liquid onto the printing material P by the inkjet method can be newly connected to the print driving unit 3. The inkjet head 10 is disposed on the downstream side of the inkjet head 32 and the upstream side of the inkjet head 4 with respect to the moving direction of the printing material P. The hydrophilic treatment liquid is supplied from the inkjet head 32 to the fastener hook / loop region of the printing material P, and the permeating liquid is supplied to the region of the ground tissue where the fibers are densely organized in the printing material P. Thereafter, when the ink is supplied from the inkjet head 4 to the printing material P, the ground structure of the color material ink supplied from the inkjet head 4 is obtained because the penetrating liquid is supplied in advance from the inkjet head 10 to the area of the ground structure. The landing ratio of the color material ink decreases, and the color material ink can be landed preferentially in the open area such as the fastener hook / loop area. “Penetration liquid” indicates a solvent or dispersion medium for dissolving or dispersing the color material, and “ink” indicates a color material dissolved or dispersed in the permeation liquid at a predetermined concentration.

Embodiment 5
As shown in FIG. 8, in the printing apparatus according to the first or second embodiment, color material ink atomizers 33 and 34 may be used instead of the inkjet heads 4 and 5. The color material ink atomizer 33 performs printing without charging after ink is atomized by ultrasonic waves. Further, the color material ink atomizer 34 is arranged on the upstream side of the color material ink atomizer 33 with respect to the moving direction of the printing material P, and charges the ink droplets after atomizing the ink droplets with ultrasonic waves. To print. The ink of the color material ink atomizer 34 is charged by generating an electric field by the electric field generator 35 between the ink discharge part side for discharging ink and the printed material P side. As a result, the color material ink atomizer 34 can land the ink predominantly in the charged area opposite to the ink droplets of the printing object P. For example, the coloring material ink atomizer 34 can have a desired charging in the raised tissue area of the printing object P. Is suitable for producing a color that is superior to the reproduction target color. On the other hand, the color material ink atomizer 33 is suitable for, for example, coloring the background texture region of the printing material P to the reproduction target color. In order to selectively charge the printed material P, for example, a method of charging the tip of the raised portion using an ion generator such as a corona charger, a method of charging the raised portion by frictional charging, a surfactant For example, a method of charging a portion where the surfactant is not supplied by lowering the electrical resistance of the fiber by supply or the like can be used.
In the print characteristic DB 2, for each of the color material ink atomizer 33 and the color material ink atomizer 34, each of a plurality of ink types, a plurality of ink supply parameters, and a plurality of print object region types is provided. Color information corresponding to the combination is stored in advance. The printed material P is composed of a ground tissue region and a raised tissue region, and the raised tissue region is present on the lower surface of the printed material P in FIG.

In the same manner as in the first embodiment, the color material ink atomizer 33 and the color material ink atomizer 34 are set so that the supply condition calculation unit 1 displays the color closest to the reproduction target color for each area of the printing material P. The combination of the ink type and the ink supply parameter is extracted from the print characteristic DB2. The ink supply parameters for each area of the printing material P extracted by the supply condition calculation unit 1 are input to the control unit 9. When the control unit 9 outputs the input ink supply parameters to the print drive unit 3 at the time when each ink is to be ejected, the print drive unit 3 outputs a drive signal corresponding to the ink supply parameters to the color material ink atomizer. 33 and the color material ink atomizer 34, respectively. At this time, the ink droplets atomized by the color material ink atomizer 34 are charged by the electric field generator 35. In response to the output of the drive signal from the print drive unit 3, the color material ink atomizer 33 supplies ink to the area of the ground structure of the print object P, and the color material ink atomizer 34 is the raised structure of the print object P. Ink is supplied to the area.

According to the printing apparatus of this embodiment, the color material ink atomizer 33 corresponding to the area of the ground tissue and the color material ink atomizer 34 corresponding to the area of the raised tissue are respectively provided, and the color material ink atomizer 33 is provided. And 34 are controlled so as to print on the areas of the printed matter P corresponding to each of the printed matter P, the printed matter P consisting of the ground tissue region and the raised tissue region having different color development characteristics is reproduced in the same manner as the reproduction target color. Can develop color.

Embodiment 6
In the printing apparatus according to the second embodiment, the measuring

devices

20 and 21 can be used which are suitable for the characteristics of each region of the printed material P. For example, as shown in FIG. 9, when measuring the color development amount of the printing material P having the ground tissue region and the raised tissue region, diffuse

illuminations

51a and 51b are respectively arranged on the upper side and the lower side of the printing material P. In addition, the

optical sensors

52a and 52b for measuring the optical reflectance from the upper side and the lower side of the printed material P are respectively disposed, and the optical sensor 53 for measuring the optical reflectance from the oblique direction of the printed material P is disposed. Good.
If the optical characteristics of the printing material P can be measured, the diffuse

illuminations

51a and 51b and the

optical sensors

52a and 52b may be arranged on either the upper side or the lower side of the printing material P. For example, as shown in FIG. The illumination 51a and the optical sensor 52a may be arranged only on the upper side of the printing material P.
Further, for example, as shown in FIG. 11, the measuring

devices

20 and 21 measure the optical characteristics by disposing an air nozzle 54 that blows air from an oblique direction so as to horizontally tilt the raised tissue of the portion measured by the optical sensor 53. Accuracy can be improved.

The printing apparatuses according to the first to sixth embodiments include the inkjet head 4, the inkjet head 5, the inkjet head 32, the color material ink atomizer 31, the color material ink atomizer 33, the color material ink atomizer 34, and the corona. Although two of the processing devices 41 are used for printing on the substrate P, three or more may be used in combination. Further, the present invention can be applied to the case where the printing material P is composed of three or more regions having different coloring characteristics.

In addition, the color development characteristics of each region of the printing material P are determined by a combination of ink type, ink supply device, and ink supply parameters. The color development characteristics of each region can also be described by the landing rate of the color material in the ink. Alternatively, the K / S value at each wavelength can be adopted. These combinations can be stored in the print characteristic DB2.
In addition, for ink types and ink supply devices that affect the landing rate of hydrophilization liquids, etc., the color development characteristics of each region can be achieved by combining these device parameters with the ink supply device and ink supply parameters for color ink. Determined. These can be stored in the print characteristic DB2.
By using such a print characteristic DB 2, the optimum droplet supply device and ink type are selected from a plurality of droplet supply devices and a plurality of ink types corresponding to a plurality of areas of the printing object to be printed. By selecting and performing printing with the ink supply parameters suitable for them, it is possible to realize the color reproduction target color.

Example 1
In the printing apparatus according to the first embodiment, using the data stored in the print characteristic DB 2, each region of the brushed tissue and the ground tissue is formed by using one type of ink with the inkjet head 4 for large droplet printing and the inkjet head 5 for small droplet printing. An example of obtaining the ink supply parameter in the case where the ink is ejected to cause color development is shown below.
As shown in Table 1, the print characteristic DB 2 stores the landing ratio of each region when the print amount normalized by the maximum print amount of each of the inkjet heads 4 and 5 is ejected as data.
If you want to print 23% of the ground tissue area and 27% of the brushed tissue area and make the brushed tissue area slightly darker, you should print 20% with the inkjet head 4 and 30% with the inkjet head 5. I understand. A known optimization calculation method can be used for this calculation, and a known interpolation method can be used for data not stored in the print characteristic DB2.
When a plurality of ink types are used, the color development of each region by the ink jet heads 4 and 5 stored in the print characteristic DB 2 can be expressed by K / S of each wavelength.

Example 2
In the printing apparatus according to the fourth embodiment, when data stored in the print characteristic DB 2 is used and ink and a hydrophilization treatment liquid are ejected by the ink jet head 4 and the ink jet head 32 to develop each region of the raised tissue and the ground tissue. An example of obtaining the ink supply parameter and the hydrophilizing liquid supply parameter is shown below.
Stored data as shown in Table 2 is useful for processing for changing the landing ratio of a specific area of the substrate P such as when using a hydrophilic treatment liquid. As shown in Table 2, the printing characteristic DB 2 stores the landing rate of each region corresponding to the combination of the printing amount of the hydrophilizing liquid from the inkjet head 32 and the printing amount of the ink from the inkjet head 4. Yes.
In the same manner as in the first embodiment, it is possible to obtain the ink supply parameter and the hydrophilization liquid supply parameter such that the color development of each area of the printing material P becomes the reproduction target color by using the print characteristic DB2.

1. Supply condition calculation unit, 2. Printing characteristic database, 3. Printing drive unit, 4, 5, 32 Inkjet head, 6. Heating device, 7. Reduction cleaning device, 8. Drying device, 9. Control unit, 20.21. Measuring device, 22. Printing result. Measurement

value input unit

31, 33, 34 Color material ink atomizer, 35 Electric field generator, 41 Corona treatment device, 42 Power supply device, 43 Discharge electrode, 51a, 51b Diffuse illumination, 52a, 52b, 53 Optical sensor, 54 Air nozzle.

Claims

A printing device that prints on a substrate having a plurality of areas having different color development characteristics to develop a reproduction target color,
A plurality of droplet supply devices for supplying droplets for preferentially coloring the plurality of areas of the substrate to be printed;
A calculation unit for calculating supply conditions of droplets to be supplied from the plurality of droplet supply devices so as to develop the printed material into the reproduction target color;
A drive unit for driving the plurality of droplet supply devices;
And a control unit that controls the drive unit based on the supply condition calculated by the calculation unit.
The printing apparatus according to claim 1, wherein the plurality of droplet supply devices include a first inkjet device that supplies ink droplets by an inkjet method.
The plurality of droplet supply devices include a second inkjet device that supplies droplets of ink by an inkjet method in a direction different from that of the first inkjet device. Printing device.
The printing apparatus according to claim 2, wherein the plurality of droplet supply devices include an atomizer that supplies droplets of atomized ink.
3. The printing apparatus according to claim 2, wherein the plurality of droplet supply devices include a hydrophilizing liquid supply device for supplying a hydrophilic liquid droplet for hydrophilizing the substrate.
The plurality of droplet supply devices include a first atomizer that charges and supplies atomized ink droplets, and a second atomizer that supplies the atomized ink droplets without charging. The printing apparatus according to claim 1, comprising:
The computing unit computes the supply conditions of the droplets to be supplied from the droplet supply device based on information on each area of the printed material and information on the reproduction target color to be printed on the printed material. The printing apparatus according to any one of claims 1 to 6, wherein:
Further comprising a database preliminarily storing color development information when each of the areas to be printed is colored by the corresponding droplet supply device;
The calculation unit generates the color development information such that each area of the printing object is colored in the reproduction target color based on information on each area of the printing object to be printed and information on the reproduction target color. 8. The printing apparatus according to claim 7, wherein a supply condition of droplets extracted from the database and supplied from the droplet supply apparatus is calculated.
A measuring device for measuring the color of the object to be printed that is colored by supplying droplets from the plurality of droplet supplying devices;
A measurement value input unit that inputs a result of colorimetric measurement of the printing object by the measurement device to the calculation unit;
The calculation unit corrects the calculated supply condition of the droplets from each droplet supply device based on the color measurement result of the printing object and the information on the reproduction target color,
The printing apparatus according to claim 7 or 8, wherein the control unit controls the driving unit so that the droplets are supplied under the supply condition corrected by the calculation unit.
A printing device that prints on a substrate having a plurality of areas having different color development characteristics to develop a reproduction target color,
A corona treatment device for hydrophilizing at least one region of the plurality of regions of the printed material by corona treatment;
An inkjet apparatus for supplying ink droplets to the substrate by an inkjet method;
A printing apparatus comprising: an ink supply device that controls the corona treatment device and the ink jet device to develop the printed material into the reproduction target color.
The printing apparatus according to any one of claims 1 to 10, wherein the plurality of areas of the substrate to be printed includes an area made of a raised tissue.
The printing apparatus according to any one of claims 1 to 11, wherein the plurality of regions of the substrate include a region made of a pile structure.
The printing apparatus according to any one of claims 1 to 12, wherein the plurality of areas of the substrate include an area composed of fastener hooks and loops.
A printing method for printing on a printing material having a plurality of regions having different color development characteristics to develop a reproduction target color,
A printing method comprising: supplying droplets for color development from a droplet supply device that preferentially supplies ink to a plurality of regions of the printed material to cause the printed material to develop the target color for reproduction .
A printing method for printing on a printing material having a plurality of regions having different color development characteristics to develop a reproduction target color,
Hydrophilizing at least one area of the plurality of areas of the substrate by corona treatment;
A printing method, wherein ink droplets are supplied to the printing object by an ink jet method to develop the reproduction target color.