JP2019155911A - Process liquid application device, drying device, liquid discharging device - Google Patents

Abstract

A treatment liquid deposition device that reduces uneven drying is provided. A printing unit (101) includes a liquid ejection head that ejects black ink and color ink from the upstream side of the continuous paper (110) in the conveying direction. The treatment liquid applying unit 106 applies a larger amount of the treatment liquid to the area to which the color ink is applied by the printing unit 101 than to the area to which the black ink is applied. An operation of applying the treatment liquid is performed. [Selection drawing] Fig. 1

Description

  The present invention relates to a treatment liquid applying apparatus, a drying apparatus, and an apparatus for discharging a liquid.

  As a printing apparatus that performs printing by applying a liquid to an application member such as a sheet material, there is a printer that includes a drying device and promotes drying of the applied liquid.

  Conventionally, an inkjet recording apparatus (Patent Document 1) provided with a dielectric heating means as a heating means, an apparatus (Patent Document 2) that irradiates and heats infrared rays after applying a pretreatment liquid containing an infrared absorber, and the like are known. ing.

JP 2016-112855 A JP, 2006-065137, A

  By the way, when heating is performed by applying a treatment liquid that increases the heating efficiency such as an infrared absorbing material, the degree of increase in heating efficiency differs between the black liquid and the color liquid. For this reason, for example, the black liquid region is overheated, and the color liquid region is underheated.

  The present invention has been made in view of the above problems, and an object thereof is to reduce drying unevenness.

In order to solve the above-described problem, a treatment liquid application apparatus according to claim 1 of the present invention includes:
A treatment liquid application means for applying a treatment liquid to an application member to which a black liquid and a color liquid are applied;
The treatment liquid application unit is configured to apply the treatment liquid more per unit area to at least the region to which the color liquid is applied than to the region to which the black liquid is applied.

  According to the present invention, drying unevenness can be reduced.

It is a schematic explanatory drawing of the printing apparatus as an apparatus which discharges the liquid which concerns on 1st Embodiment of this invention. It is a plane explanatory view of an example of the processing liquid head of the processing liquid application part in the device. It is a block diagram of the part in connection with control of process liquid application in a process liquid application part. It is typical explanatory drawing with which it uses for operation | movement description of the same embodiment. It is typical explanatory drawing explaining the application | coating state of the process liquid in 2nd Embodiment of this invention. It is a schematic explanatory drawing of the printing apparatus as an apparatus which discharges the liquid which concerns on 3rd Embodiment of this invention. It is a schematic explanatory drawing of the printing apparatus as an apparatus which discharges the liquid which concerns on 4th Embodiment of this invention. It is typical explanatory drawing explaining the application state of the process liquid in 5th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a schematic explanatory view of a printing apparatus as an apparatus for ejecting liquid according to the embodiment, and FIG. 2 is an explanatory plan view of an example of a processing liquid head of a processing liquid application unit in the apparatus.

  The printing apparatus 100 is an ink jet recording apparatus, and prints an image by ejecting ink, which is a liquid of a predetermined color, onto a continuous paper 110 that is an application member (conveyed member, heating target, drying target). A printing unit 101 is provided.

  In the printing unit 101, liquid discharge heads 111 (111 </ b> A to 111 </ b> D), which are full-line liquid discharge units for four colors, are arranged from the upstream side in the conveyance direction (arrow direction) of the continuous paper 110. The liquid discharge head 111 discharges black K ink (black ink) as a black liquid and cyan (C), magenta M, and yellow Y inks (color ink) as color liquids to the continuous paper 110. To do. The type and number of colors are not limited to this.

  In the present embodiment, the black ink is a first liquid containing carbon black, and the color ink is a second liquid not containing carbon black. In addition, the 2nd liquid with less content of a carbon blank than a 1st liquid can also be used.

  Here, the ink contains propylene glycol or glycerin.

  Arranged on the upstream side of the printing unit 101 in the continuous paper transport direction (moving direction) is a processing liquid application unit 106 configured by the processing liquid application device according to the present invention for applying a processing liquid to the continuous paper 110. Has been. The processing liquid applying unit 106 includes a processing liquid head 112 that discharges and applies the processing liquid to the continuous paper 110.

  The processing liquid head 112 is constituted by a full line type head in which a plurality of liquid discharging heads 121 each having a nozzle row 122 for discharging a processing liquid are arranged in a staggered manner on a base member 123, for example. By controlling the ejection amount from the head 121, the amount of treatment liquid applied can be changed.

  In addition to the method using the processing liquid head 112 described above, a transfer method using a roller or the like may be used as a method for applying the processing liquid. In the transfer method, the processing liquid can be selectively applied to the medium by selectively applying the processing liquid to the roller or the like and then bringing the roller into contact with the medium.

  The treatment liquid application unit 106 performs an operation of applying a larger amount of the treatment liquid to an area other than the area to which the black ink is applied by the printing unit 101 than the area to which the black ink is applied.

  Here, the processing liquid contains a solvent for increasing the dielectric constant. The dielectric constant of the liquid can be measured by the coaxial resonance method. Examples of the solvent for increasing the dielectric constant include water, propylene glycol, glycerin and the like (the content is not limited).

  Further, on the downstream side of the printing unit 101 in the transport direction, a drying device 104 including a heating unit 114 as a dielectric heating device that heats the continuous paper 110 to which the treatment liquid and ink are applied is disposed. The heating means 114 heats the continuous paper 110 by high frequency dielectric heating.

  A transport unit 103 that transports the continuous paper 110 to the processing liquid application unit 106, the printing unit 101, and the drying unit 104 is provided. The transport unit 103 includes a transport roller 132 that transports the continuous paper 110 fed from the feed roll 131, and a transport guide member 133 that guides the transported continuous paper 110 facing the processing liquid applying unit 106 and the printing unit 101. And a discharge roller 134 that discharges the continuous paper 110 toward the take-up roll 135 on the downstream side of the drying unit 104.

  In the printing apparatus 100, while the continuous paper 110 fed from the feeding roll 131 is conveyed by the conveying unit 103, the processing liquid is applied by the processing liquid applying unit 106, a required image is printed by the printing unit 101, and the drying unit The film is dried at 104 and wound on a winding roll 135.

  Next, a portion related to control of the treatment liquid application in the treatment liquid application unit 106 will be described with reference to the block diagram of FIG.

  The area extraction unit 501 extracts an area to which black ink is not applied, that is, an area to which color ink is applied, from the image data. The ejection amount data creation unit 502 increases the amount of application per unit area to be applied to the region to which black ink is not applied from the extraction result of the region extraction unit 501 than the amount of application per unit area of the region to which black ink is applied. The discharged amount data is created.

  The head drive control unit 503 drives the processing liquid head 112 in accordance with the discharge amount data created by the discharge amount data creation unit 502 to discharge the processing liquid. At this time, the treatment liquid application amount per unit area of the region to which black ink is not applied, that is, the region to which color ink is applied, is larger than the treatment liquid application amount per unit area of the region to which black ink is applied. .

  Next, the operation of this embodiment will be described with reference to FIG. FIG. 4 is a schematic explanatory diagram for explaining the same.

  In the present embodiment, as shown in FIG. 4, the treatment liquid 200 is ejected and applied to the surface (printing surface) of the continuous paper 110 by the treatment liquid application unit 106. The treatment liquid 200 contains a solvent for increasing the dielectric constant as described above.

  At this time, the application amount per unit area of the processing liquid 200 in the region other than the region to which the black ink 201 is applied (here, the region to which the color ink 202 is applied) is processed in the region to which the black ink 201 is applied. Application control is performed so that the application amount of the liquid 200 per unit area is increased.

  That is, the application amount per unit area of the processing liquid 200 applied by the processing liquid application unit is an area where the black liquid (black ink 201) is applied in the area where the color liquid (color ink 202) is applied. More than.

  Then, the black ink 201 and the color ink 202 are ejected from the liquid ejection head 111 of the printing unit 101 onto the printing surface of the continuous paper 110 to which the processing liquid 200 is applied, and an image is printed. The black ink 201 becomes conductive ink by containing carbon black, and the color ink 202 not containing carbon black becomes non-conductive ink. In FIG. 3, the solvent 203 contained in the inks 201 and 202 is shown separately from the inks 201 and 202.

  Thereafter, the continuous paper 110 that has passed through the printing unit 101 is heated by dielectric heating by passing through the drying device 104 that includes the dielectric heating means 114.

  At this time, the region to which the black ink 201 that is the conductive ink is applied has higher heating efficiency than the region to which the color ink is applied. Therefore, assuming that the amount of the treatment liquid 200 applied is constant, the black ink When the dielectric heating according to 201 is performed, the heating of the region to which the color ink 202 which is a non-conductive ink is applied becomes insufficient.

  Therefore, the amount of the treatment liquid 200 containing a solvent for increasing the dielectric constant applied to the region to which the color ink 202 is applied (at least a solvent having a higher dielectric constant than that of the color ink) is increased, and the dielectric according to the black ink 201 Even if heating is performed, the region to which the color ink 202 is applied is also sufficiently heated.

  Thereby, the uneven heating of the region to which the black ink 201 is applied and the region to which the color ink 202 is applied can be reduced.

  In other words, in the present embodiment, when the treatment liquid is applied to the application member to which the first liquid containing carbon black and the second liquid not containing carbon black are applied, the treatment liquid 200 is at least the second liquid. For the region to which the liquid is applied, a larger amount is applied per unit area than the region to which the first liquid is applied.

  That is, the amount of the treatment liquid 200 applied by the treatment liquid application unit per unit area is greater in the region to which the second liquid is applied than in the region to which the first liquid is applied.

  Thereby, the heating nonuniformity of the area | region to which the 1st liquid was provided and the area | region to which the 2nd liquid was provided can be reduced.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a schematic explanatory view for explaining a treatment liquid application state in the embodiment.

  In the present embodiment, the processing liquid 200 is not applied to the area to which the black ink 201 is applied, but the processing liquid 200 is applied to the area to which the color ink 202 is applied. Even in this configuration, the application amount of the treatment liquid 200 in the region to which the color ink 202 is applied other than the region to which the black ink 201 is applied is greater than the application amount (zero) of the treatment liquid 200 in the region to which the black ink 201 is applied. Become more.

  Therefore, similarly to the first embodiment, it is possible to reduce the uneven heating of the region to which the black ink 201 is applied and the region to which the color ink 202 is applied.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic explanatory diagram of a printing apparatus as an apparatus for ejecting liquid according to the embodiment.

  In the present embodiment, the treatment liquid application unit 106 is arranged on the downstream side in the transport direction of the printing unit 101.

  Even if comprised in this way, the effect similar to each said embodiment can be acquired.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic explanatory diagram of a printing apparatus as an apparatus for ejecting liquid according to the embodiment.

  In the present embodiment, the drying unit 104 serving as a drying apparatus according to the present invention includes a processing liquid application unit 106 that is a processing liquid application apparatus according to the present invention and a heating unit 114 that is a heating apparatus.

  Even if comprised in this way, the effect similar to each said embodiment can be acquired.

  Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic explanatory view for explaining a treatment liquid application state in the embodiment.

  In the present embodiment, when there is a region S1 to which the color ink 202 and the black ink 201 are applied in an overlapping manner, the region S1 that is applied in an overlapping manner has only black ink as a region to which the color ink 202 is applied. The application amount of the treatment liquid 200 per unit area is made larger than the application region.

  In other words, the region S1 to which the first liquid and the second liquid are applied in an overlapping manner is the region to which the second liquid is applied, and the processing liquid 200 per unit area is greater than the region to which only the first liquid is applied. The amount of grant is increased.

  That is, if the black ink 201 does not ignite or yellow before the drying of the color ink 202 is completed, the treatment liquid 200 can be applied even in the region to which the black ink 201 is applied. In the case of infrared irradiation, the difference in drying efficiency of the black ink 201 is smaller than that of the high-frequency dielectric heating, so that it can be applied to the region to which the black ink 201 is applied.

  For example, the treatment liquid 200 has the same applied amount per unit area in the region to which the black ink 201 is applied (black region) and the region to which another color is applied, and the energy applied per unit area. When the irradiation amount is the same and the combination of the “treatment liquid and energy applying means” is used such that the drying time is 1 (black): 5 (other colors), the content of the treatment liquid 200 is set to the black region. The dot pattern data to which the treatment liquid 200 is applied may be formed (solvent ejection control) so that the other color region is applied five times more than black.

  In the above embodiment, the example in which the treatment liquid includes a solvent that increases the dielectric constant has been described. However, the treatment liquid may include a solvent that increases the conductivity. For example, water usually contains some ions (however, if it is completely pure water, there is no conductivity), and if it is glycerin other than water, the value is low, but it has conductivity. .

  In high-frequency dielectric heating, particularly at high frequencies (around 40 MHz), the conductivity strongly affects the heat generation, and in the microwave (2.45 GHz or higher) band, not only the conductivity but also the dielectric constant affects the heat generation.

  When the treatment liquid contains a solvent that increases conductivity, the amount of treatment liquid applied is determined based on the ratio between the conductivity in the black ink application area after application of the treatment liquid and the conductivity per unit area in the cyan ink application area. It can also be determined. For example, when the black ink conductivity is 0.06 S / m and the color ink conductivity (for example, cyan ink: 0.05 S / m), the treatment liquid is not applied to the black ink application region, and the cyan ink is used. A treatment liquid having a conductivity of 0.07 S / m may be applied to the application region in the same amount as the application amount of cyan ink.

  It is preferable to determine the conductivity of the solvent used in the treatment liquid in accordance with the conductivity of the lowest ink in the color ink. In this case, the amount can be appropriately adjusted by reducing the amount of the treatment liquid applied to the other color ink regions than the amount of the treatment liquid applied to the color ink region having the lowest conductivity.

  In addition, a treatment liquid that takes into account both conductivity and dielectric constant can be used according to the degree of influence on heat generation. For example, in the above-described microwave (2.45 GHz or higher) band, it is preferable to use a treatment liquid that takes into account both conductivity and dielectric constant.

  If the treatment liquid is not applied under the black ink, use a solvent that increases the drying efficiency of the color ink area (a solvent having at least one of a dielectric constant and conductivity higher than that of the color ink). In the case of applying the liquid, a solvent that enhances the drying efficiency of the black ink and color ink regions (a solvent having a higher dielectric constant and conductivity than that of the black ink and color ink) is used.

  Moreover, in the said embodiment, although the process liquid is demonstrated in the example which is a process liquid which raises a dielectric constant, the process liquid which improves infrared absorption efficiency may be sufficient. In other words, any treatment liquid whose drying efficiency is improved by applying energy may be used.

  Even when the black ink and the color ink are very dry, it is conceivable that uneven drying occurs due to the black ink being dried too quickly. In this case, a treatment liquid that reduces at least one of dielectric constant and conductivity can be used.

  At this time, the treatment liquid is applied to the area where the black ink is applied rather than the area where the color ink is applied.

  If the treatment liquid is not applied under the black ink, use a solvent that lowers the drying efficiency of the color ink area (a solvent having a lower dielectric constant and conductivity than that of the color ink), and under the black ink. When the treatment liquid is applied, a solvent that lowers the drying efficiency of the black ink and color ink regions (a solvent having a lower dielectric constant and conductivity than that of the black ink and color ink) is used.

  Moreover, in each said embodiment, although the application member demonstrated in the example which is a continuous paper, it is not restricted to this, If it is a member to which a process liquid is provided by the process liquid application apparatus which concerns on this invention There is no particular limitation. For example, the applying member may be a continuous body such as continuous paper, roll paper, and web, a cut sheet material, wallpaper, a sheet for electronic circuit boards such as prepreg, and the like.

  In addition, when printing on the treatment liquid application member, in addition to recording images such as characters and figures such as ink, an image having no meaning such as a pattern is used as a liquid such as ink for the purpose of decoration and decoration. It may be given by.

  In the present application, the liquid to be applied is not particularly limited, but is preferably a liquid having a viscosity of 30 mPa · s or less at room temperature, normal pressure, or by heating and cooling. More specifically, solvents such as water and organic solvents, colorants such as dyes and pigments, functional materials such as polymerizable compounds, resins, and surfactants, and biocompatible materials such as DNA, amino acids, proteins, and calcium. , Edible materials such as natural pigments, solutions, suspensions, emulsions, and the like. These include, for example, inkjet inks, surface treatment liquids, components of electronic devices and light emitting devices, and formation of electronic circuit resist patterns. It can be used in applications such as liquids for use, three-dimensional modeling material liquids, and the like.

  A thermal actuator that uses an electrothermal transducer such as a piezoelectric actuator (laminated piezoelectric element and thin film piezoelectric element), a heating resistor as an energy generation source for ejecting liquid when a liquid ejection head is used as the treatment liquid application means; Those using an electrostatic actuator composed of a diaphragm and a counter electrode are included.

  Note that printing in the present application has the same meaning as image formation, recording, printing, printing, and the like.

100 printing device (device for discharging liquid)
101 Printing section 104 Drying section (Drying device)
106 treatment liquid application unit (treatment liquid application device)
110 Continuous paper (for drying)

Claims (14)

A treatment liquid application means for applying a treatment liquid to an application member to which a black liquid and a color liquid are applied;
The treatment liquid application unit applies the treatment liquid more per unit area than at least the region to which the black liquid is applied to the region to which the color liquid is applied. . A treatment liquid is applied to an application member to which a first liquid containing carbon black and a second liquid not containing the carbon black or having a lower carbon black content than the first liquid are applied. A treatment liquid applying means for
The processing liquid applying unit applies the processing liquid more per unit area than at least the region to which the first liquid is applied to the region to which the second liquid is applied. Liquid applicator. The treatment liquid application apparatus according to claim 1, wherein the treatment liquid is a treatment liquid that increases electrical conductivity. The processing liquid application apparatus according to claim 1, wherein the processing liquid is a processing liquid that increases a dielectric constant. The processing liquid application apparatus according to claim 1, wherein the processing liquid is not applied to a region to which the black liquid is applied. The treatment liquid applying apparatus according to claim 1, wherein the treatment liquid contains propylene glycol or glycerin. The treatment liquid application apparatus according to any one of claims 1 to 6,
And a heating device for heating the application member. The heating apparatus according to claim 7, wherein the heating apparatus is a dielectric heating apparatus. The treatment liquid application apparatus according to any one of claims 1 to 6, or the drying apparatus according to claim 7 or claim 8,
An apparatus for ejecting liquid, comprising: a liquid ejection unit that applies the black liquid and the color liquid to the application member. The apparatus for discharging a liquid according to claim 9, wherein the treatment liquid applying device is disposed on the upstream side of the liquid discharging means in the moving direction of the applying member. The apparatus for discharging a liquid according to claim 9, wherein the treatment liquid applying device is disposed on the downstream side of the liquid discharging means in the moving direction of the applying member. The apparatus for discharging a liquid according to claim 9, wherein the liquid contains propylene glycol or glycerin. A treatment liquid application means for applying a treatment liquid to an application member to which a black liquid and a color liquid are applied;
The treatment liquid application unit applies the treatment liquid more per unit area than at least the area where the black liquid is applied to the area where the color liquid is applied
The treatment liquid application apparatus, wherein the treatment liquid has higher drying efficiency than the color liquid. A treatment liquid application means for applying a treatment liquid to an application member to which a black liquid and a color liquid are applied;
The treatment liquid application means applies the treatment liquid to at least the area to which the color liquid is applied, less per unit area than the area to which the black liquid is applied,
The treatment liquid application apparatus, wherein the treatment liquid has a drying efficiency lower than that of the black liquid.

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