JP2018051871A - Printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing method capable of suppressing an increase in printing time while more securely improving color developability of ink colors of print images.SOLUTION: Provided is a printing method for printing a print image on a printing area Pa of a printing subject matter P, which includes: a step A which applies a white ink to the printing area Pa through employing a screen printing method by using a first screen printing plate 10 having an opening part 11a corresponding to the printing area Pa; a step B which applies a pretreatment liquid containing at least polyvalent metal salt to a base image; and a step C which prints the print image to the printing area Pa through employing an inkjet method.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a printing method for printing a print image on a substrate.

  Conventionally, when a print image such as a color image is printed on a print area of a printing material, an ink jet printing method has been widely applied.

  Here, when the printing material has a predetermined color, the ink color of the printing image is reflected in the predetermined color of the printing material, and the color developability of the ink color of the printing image may be reduced.

  For this reason, an ink jet printing method has also been proposed in which a base image is formed with white ink in a print region of a substrate, and then a print image is printed on the base image (see, for example, Patent Document 1).

JP 2002-38063 A

  By the way, in order to further improve the color developability of the ink color of the printed image, it is necessary to improve the concealment property of the base image. In order to form a background image with high concealability, it is desired to form the background image with a relatively thick white ink over the entire printing area.

  However, in the ink jet printing method as in the prior art, since ink droplets are applied from the ink head in dot units, the processing time for forming a highly concealed base image increases. As a result, there has been a problem that the printing time for printing the print image on the substrate is increased.

  In addition, when a print image is printed on a base image formed by an inkjet printing method as in the prior art, the ink of the print image may sink into the white ink of the base image. In such a case, since the color developability of the ink color of the printed image is not necessarily improved, a method for more reliably improving the color developability of the ink color of the printed image has been desired.

  The present invention has been made in view of the above-described situation, and an object of the present invention is to provide a printing method capable of suppressing an increase in printing time while more reliably improving the color developability of the ink color of a printed image. And

  In order to achieve the above object, a first feature of a printing method according to the present invention is a printing method for printing a print image on a printing area of a printing material, wherein a screen plate having an opening corresponding to the printing area is provided. A step A for applying white ink to the printing area by a screen printing method; a step B for applying a pretreatment liquid containing at least a polyvalent metal salt to the printing area; and a method for applying the ink to the printing area by an inkjet method. And C for printing the print image.

  A second feature of the printing method according to the present invention is that, in the step B, the pretreatment liquid is applied to the print area by a screen printing method using another screen plate having an opening corresponding to the print area. There is to work.

  A third feature of the printing method according to the present invention is that the screen plate used in the step A includes a first screen ridge configured by a first mesh number, and the other screen plate used in the step B. Is provided with a second screen cage constituted by the second mesh number, and the first mesh number is larger than the second mesh number.

  According to the 1st characteristic of the printing method which concerns on this invention, the process A coated with white ink by a screen printing system is included. Thereby, compared with the case where it coats with white ink by an inkjet system, the processing time which forms a base image with white ink can be reduced.

  Further, according to the first feature of the printing method according to the present invention, the step A of applying a white ink by a screen printing method and the step B of applying a pretreatment liquid containing at least a polyvalent metal salt to a printing region. including. Thereby, since the white ink which forms a base image can be aggregated, the concealment property by a base image is improved and the color development property of the ink color of a printed image can be improved more reliably.

  As described above, according to the first feature of the printing method of the present invention, it is possible to suppress an increase in printing time while more reliably improving the color developability of the ink color of the printed image.

  According to the second feature of the printing method of the present invention, in step B, the pretreatment liquid is applied to the printing area by a screen printing method. Thereby, since the application area | region of a pre-processing liquid can be set correctly, it can prevent that the to-be-printed material P gets dirty by the pre-processing liquid scattering around a printing area | region.

  According to the third feature of the printing method of the present invention, the screen plate used in step A includes a first screen ridge configured by the first mesh number, and the other screen plates used in step B are: A second screen cage is provided that is configured with the second mesh number. Further, the first mesh number is larger than the second mesh number. As a result, in step A, unevenness is less likely to occur in the white ink applied to form the base image, and beading (white spots) caused by movement of dots that land on the inclined portion formed by the unevenness is caused. Therefore, the color developability of the ink color of the printed image can be improved more reliably.

3 is a flowchart illustrating a printing method according to the first embodiment of the present invention. It is an expansion perspective view for explaining the 1st screen version concerning a 1st embodiment of the present invention. It is a perspective view for demonstrating the ground treatment using the 1st screen plate which concerns on 1st Embodiment of this invention. It is a development perspective view for explaining the 2nd screen version concerning a 1st embodiment of the present invention. It is a perspective view for demonstrating the pre-processing using the 2nd screen plate which concerns on 1st Embodiment of this invention. It is a perspective view for demonstrating this printing process using the inkjet printing apparatus which concerns on 1st Embodiment of this invention. It is a table | surface which shows the result of comparative evaluation.

  Hereinafter, a printing method according to an embodiment of the present invention will be described in detail with reference to the drawings. Further, the embodiments shown below exemplify devices and the like for embodying the technical idea of the present invention, and the technical idea of the present invention is to arrange the components and the like as follows. Not specific. The technical idea of the present invention can be variously modified within the scope of the claims.

[First Embodiment]
<Configuration of printing method>
The printing method according to the first embodiment of the present invention prints a print image on the print area Pa of the substrate P. FIG. 1 is a flowchart showing a printing method according to the first embodiment of the present invention. As shown in FIG. 1, the printing method includes a base processing step S10 (step A), a preprocessing step S20 (step B), and a main printing processing step S30 (step C).

  The substrate P has, for example, a predetermined color such as black. Although the member of the to-be-printed material P is not specifically limited, The material used for clothes, paper, etc. may be sufficient.

  In the ground processing step S10, ground processing for forming a ground image on the printing material P is executed. Specifically, in the ground processing step S10, in order to form a ground image in the printing area Pa, the first screen plate 10 having the opening 11a corresponding to the printing area Pa is used, and the printing area Pa is whitened by the screen printing method. Apply ink. In the present embodiment, the first screen plate 10 constitutes the “screen plate” recited in the claims.

  FIG. 2 shows an exploded perspective view of the first screen plate 10. FIG. 3 is a perspective view for explaining the ground processing using the first screen plate 10. In the following description, the width direction X of the substrate P, the longitudinal direction Y of the substrate P, and the thickness direction Z of the substrate P will be defined and described.

  As shown in FIG. 2, the first screen plate 10 includes a first film sheet 11, a first plate frame 12, and a first screen cage 13.

  An opening 11a is formed in the first film sheet 11 by thermal perforation using a heating method. The opening 11a is formed so as to be in a position corresponding to the printing region Pa of the printing material P to be coated with white ink in the width direction X and the longitudinal direction Y when the base processing is performed.

  The first plate frame 12 is made of a metal material or a resin material. The first plate frame 12 is formed in a quadrangular shape. In the first plate frame 12, a rectangular hole 12a penetrating in the thickness direction Z is formed inside. On the lower surface 12b of the first plate frame 12, a first screen ridge 13 is stretched.

  The first screen rod 13 has a first mesh 13a formed in a mesh shape by yarns made of polyester resin or the like being stretched in a lattice shape.

  The first screen rod 13 is preferably configured so that the first mesh number indicating the number of yarns per inch is 120 to 250, and more preferably 180 to 220.

  In the ground processing step S10, as shown in FIG. 3, after the first screen plate 10 is overlaid on the substrate P, the first film sheet is moved while moving the squeegee 15 within the rectangular hole 12a of the first plate frame 12. 11 extends the white ink WK. As a result, the white ink WK is pushed into the printing material P side through the opening 11a of the first film sheet 11, and a base image filled with the white ink WK is printed in the printing area Pa of the printing material P.

  Next, in pre-processing process S20, pre-processing is performed. Specifically, in the pretreatment step S20, the pretreatment liquid PS is applied to the printing area Pa. That is, the pretreatment liquid PS is applied on the white ink WK that forms the base image.

  Here, in the present embodiment, in the pretreatment step S20, the pretreatment liquid PS is applied to the printing area Pa by the screen printing method using the second screen plate 20 having the opening 21a corresponding to the printing area Pa. .

  The pretreatment liquid PS contains at least a polyvalent metal salt. The polyvalent metal salt is an aggregating agent that can be expected to have an effect of aggregating the coloring material by reacting with the coloring material of the ink.

Polyvalent metal salts are, for ^{example, Ca ++, Cu ++, Ni} ++, Mg ++, Zn ++, Ba ++, Al +++, composed of at least one metal ion selected from the group consisting of ^{Fe +++} and ^{Cr +++} Salt. Of these, Ca ⁺⁺ or Mg ⁺⁺ is preferred from the viewpoint of coloring and safety to the body. Further, the pretreatment liquid PS may contain a resin for improving the fixing property of the flocculant. Examples thereof include acrylamide resins such as urethane resin, (meth) acrylic resin, styrene / (meth) acrylic resin, olefin resin, vinyl chloride resin, vinyl acetate resin, ester resin, and the like. Examples of the ionicity of the resin include nonionicity, cationicity, and weak anionicity from the viewpoint of stability of mixing with the metal salt. Use of a cationic resin can be expected to improve the cohesiveness of the ink.

  Moreover, the pretreatment liquid PS may contain a sealing agent. The sealant can be expected to have an effect of inhibiting the ink coloring material from penetrating into the printing material P. Examples of the sealing agent include inorganic particles such as silica. The average particle size of the inorganic particles is preferably changed according to the particle size of the ink, but may be 500 nm or less, for example.

  FIG. 4 shows an exploded perspective view of the second screen plate 20 used in the pretreatment step S20. FIG. 5 is a perspective view for explaining the ground processing using the second screen plate 20. The second screen plate 20 constitutes “another screen plate” recited in the claims.

  As shown in FIG. 4, the second screen plate 20 includes a second film sheet 21, a second plate frame 22, and a second screen cage 23.

  The second film sheet 21 has an opening 21a formed by thermal perforation using a heating method. The opening 21a is formed at a position corresponding to the printing area Pa of the printing material P to be coated with the pretreatment liquid PS in the pretreatment.

  The second plate frame 22 is made of a metal material or a resin material. The second plate frame 22 is formed in a quadrangular shape. The second plate frame 22 has a rectangular hole 22a penetrating in the thickness direction Z inside. On the lower surface 22b of the second plate frame 22, a second screen rod 23 is stretched.

  The second screen rod 23 is formed of a mesh made of polyester resin or the like so that the second mesh 23a is formed in a mesh shape. The second screen rod 23 is preferably configured such that the second mesh number indicating the number of yarns per inch is 50 to 100. The second mesh number is more preferably configured to be 60-80.

  In the pretreatment step S20, as shown in FIG. 5, the second film sheet 20 is moved while the squeegee 25 is moved within the rectangular hole 22a of the second plate frame 22 after the second screen plate 20 is superimposed on the substrate P. The pretreatment liquid PS is extended to 21. Thereby, the pretreatment liquid PS is pushed into the substrate P through the opening 21a of the second film sheet 21, and the pretreatment liquid PS is applied to the base image.

  In the present embodiment, the first mesh number of the first screen ridge 13 is configured to be larger than the second mesh number of the second screen ridge 23.

  In the main print processing step S30, the main print processing is executed. Specifically, in this print processing step S30, a print image is printed in the print area Pa by an inkjet method.

  FIG. 6 is a perspective view for explaining the main printing process using the ink jet printing apparatus. In the example of FIG. 6, for the sake of explanation, the inkjet head 30 provided in the inkjet printing apparatus is mainly shown, and other devices provided in the inkjet printing apparatus are omitted.

  In this print processing step S30, as shown in FIG. 6, a print image is printed on the print area Pa of the substrate P based on the image data. The print image is expressed by color ink MK. The color ink MK is not particularly limited. For example, the color ink MK includes black ink, cyan ink, magenta ink, and yellow ink.

<Action and effect>
As described above, the printing method according to the first embodiment of the present invention includes the ground treatment step S10 in which the white ink is applied to the printing region by the screen printing method. Thereby, compared with the case where white ink is applied by the inkjet method, the processing time for forming the base image with the white ink can be reduced.

  Further, the printing method according to the first embodiment of the present invention includes a step A of applying a white ink by a screen printing method and a step B of applying a pretreatment liquid containing at least a polyvalent metal salt to a printing region. . As a result, the white ink (base ink) that forms the base image can be aggregated, so that the concealment by the base image is enhanced, and the color development of the ink color of the printed image can be improved more reliably.

  As described above, according to the printing method according to the first embodiment of the present invention, it is possible to more reliably improve the color developability of the ink color of the printed image and to suppress an increase in the printing time.

  Further, in the printing method according to the first embodiment of the present invention, in the pretreatment step S20, the pretreatment liquid is applied to the printing area by the screen printing method. Thereby, since the application area | region of a pre-processing liquid can be set correctly, it can prevent that the to-be-printed material P gets dirty by the pre-processing liquid scattering around a printing area | region.

  Further, in the printing method according to the first embodiment of the present invention, the screen plate used in the base treatment step S10 includes the first screen wrinkle constituted by the first mesh number, and is used in the pretreatment step S20. The screen plate 20 includes a second screen ridge configured by the second mesh number. Further, the first mesh number is larger than the second mesh number.

  Here, in general, since the screen diameter having a larger number of meshes is configured such that the thread diameter becomes thinner, the first screen thread is configured so that the thread diameter becomes relatively thinner. Accordingly, the white ink applied by using the first screen plate 10 having the first screen wrinkles in the ground treatment step S10 is less likely to be uneven, and the dots that land on the inclined portion formed by the unevenness move. Since beading (white spots) caused by this phenomenon is reduced, the color development of the ink color of the printed image can be improved more reliably.

  In addition, since the second mesh number is smaller than the first mesh number, the size of the second mesh 23a is increased in the second screen cage. Accordingly, when the pretreatment liquid is applied using the second screen plate 20 in the pretreatment step S20, even if the white ink of the background image adheres around the threads of the second screen wrinkle, Since the mesh can be prevented from being clogged, the pretreatment liquid can be reliably applied to the base image.

  A printing method is also conceivable in which, without executing the preprocessing step S20, the base processing is executed by the screen printing method in the base processing step S10, and then the main printing processing is executed by the ink jet method in the main printing processing step S30.

  However, if the pre-processing step S20 is not performed, the color ink dot coalescence or insufficient leveling occurs due to the respective characteristics of the white ink of the base image and the color ink of the print image, and the print image There is a possibility that the color developability is lowered. For this reason, it may be necessary to limit the materials that can be used for the white ink and the color ink.

  In the printing method according to the first embodiment of the present invention, by performing the pretreatment in the pretreatment step S20, the pretreatment liquid reacts with the components of the color ink, and it is possible to prevent color ink dot coalescence and insufficient leveling. Therefore, a decrease in color developability of the printed image is suppressed. Thereby, the freedom degree of the material which can be used for white ink and color ink can also be raised.

  In the first embodiment of the present invention, the first screen plate 13 of the first screen plate 10 used in the base treatment step S10 is configured to have a first mesh number of 120 to 250. preferable. This is due to the following reason.

  Since the viscosity of the color ink ejected by the inkjet method in this printing processing step S30 is relatively low, when unevenness is formed on the surface of the base image, the dot reproducibility is affected by the dot flow and distortion caused by the unevenness. There is a risk of giving.

  In addition, when white ink is applied by the screen printing method in the ground treatment step S <b> 10, irregularities may be formed on the surface of the white ink by the threads of the first screen ridge 13. However, as in the printing method according to the first embodiment of the present invention, if the first mesh number of the first screen ridge 13 is 120 or more, the formation of irregularities can be suppressed. Thereby, when printing a printing image by this inkjet process in this printing process step S30, since the dot flow and distortion resulting from the unevenness | corrugation formed in a white ink can be suppressed, the fine character reproducibility of a printing image is also improved.

  Further, when the first mesh number is 250 or less, it is possible to reliably ensure the ink permeability of the white ink. In addition, it is more preferable that the first mesh number is configured to be 180 to 220.

  In the printing method according to the first embodiment of the present invention, the print image is printed by the inkjet method in the print processing step S30. As a result, a print image with high color position accuracy can be reproduced, so that the print quality can be improved.

  In the printing method according to the first embodiment of the present invention, the pretreatment liquid is applied to the printing area Pa by the screen printing method in the pretreatment step S20, but the coating method is not limited to this. For example, the pretreatment liquid may be applied to the printing area Pa by a spray method.

  Moreover, it is preferable that the outer edge of the opening part 21a formed in the 2nd film sheet 21 is formed in the outer side in the range of 0.5 mm or more and 10 mm or less rather than the outer edge of the opening part 11a of the 1st film sheet 11. As a result, the area of the pretreatment liquid coating area is larger than the area of the background image area. Therefore, in the preprocessing step S20, the position of the pretreatment liquid coating area is set to the position of the background image area. The pretreatment liquid can be reliably applied to the base image even if it is slightly deviated.

[Comparison evaluation]
Next, in order to clarify the effects of the present invention, comparative evaluations performed by the printing methods according to the comparative examples and examples will be described. The printing method and evaluation result of Comparative Examples 1-4 and Examples 1-6 are shown in FIG. In addition, this invention is not limited at all by these examples.

<Experiment method>
Printing was performed on the substrate P by the printing methods according to Comparative Examples 1 to 4 and Examples 1 to 6, and the printing results were evaluated. As the printing material P, 20 black 100% cotton cloths (T-shirts) were prepared.

  In all of the printing methods according to Comparative Examples 1 to 4 and Examples 1 to 6, a base treatment process for applying white ink to form a base image, and a main print process for printing the print image on the base image Process. Only the printing methods according to Comparative Examples 1 and 4 included the preparation process step. In the preparatory process, a preparatory process was performed in which a pretreatment liquid was applied in advance to the printing area Pa by a spray method.

  In addition, the print image printed in this print processing step includes 12-point and 16-point characters (3 characters each) drawn in five colors of black, red, blue, green, and yellow, and black, red, blue, and green. A 5 × 5 cm painted image drawn in five colors of yellow was employed.

  Details of the printing method are as shown in FIG. In addition, after printing a printed image on the printing material P by the printing methods according to Comparative Examples 1 to 4 and Examples 1 to 6, the printing material P is thermally fixed by a heat press at 150 ° C. for 60 seconds.

<Ink>
In FIG. 7, the types of white ink shown in the base treatment process are as follows.

W1: RISO water-based ink 1000mL white (water-based pigment ink for screen) manufactured by Riso Kagaku
W2: Unibinder BR-W (improved) (water-based pigment ink for screen)
W3: MaOZ-T200Wh (water-based pigment ink for inkjet) manufactured by Mastermind

<Pretreatment liquid>
In FIG. 7, the types of pretreatment liquids shown in the preparation treatment step and the pretreatment step are as follows.

  U1: By mixing 100 g of calcium nitrate (manufactured by Wako Pure Chemical Industries, Ltd.) and 700 g of ion-exchanged water, 200 g of mobile vinyl 6750 (acrylic resin emulsion, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) is further mixed therewith. Pretreatment liquid U1 was produced.

  U2: By mixing 100 g of calcium chloride (manufactured by Wako Pure Chemical Industries, Ltd.) and 700 g of ion-exchanged water, 200 g of mobile vinyl 6750 (acrylic resin emulsion, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) is further mixed. Pretreatment liquid U2 was produced.

<Color ink>
In FIG. 7, the types of color inks shown in the present printing process are as follows.

C1: RISO screen ink 1000mL made by Riso Kagaku Kogyo Black, Red, Blue, Green, Yellow (Water-based pigment ink for screen)
C2: Mastermind maOZ-T200Bk, maOZ-T200c, maOZ-T200m, maOZ-T200y (water-based pigment ink for inkjet)

<Evaluation items>
After printing a printed image on the substrate P by the printing methods according to Comparative Examples 1 to 4 and Examples 1 to 6, “printing time”, “coloring property”, “clogging”, “fine character reproducibility”, “non-printing” Each of “area stains” was evaluated as an evaluation item. Details of the evaluation items are as follows.

(Printing time)
“Printing time” refers to the working time of each process such as “preparation processing step”, “base processing step”, “pretreatment step”, “main printing processing step” in each printing method of the comparative example and the example. Indicates the total measurement time measured individually. In FIG. 7, “◯” and “x” shown as the evaluation results of “printing time” mean the following.

○: Printing time is within 90 minutes ×: Printing time is longer than 90 minutes

(Color development)
“Color development” represents the evaluation result of the color development of a printed image. In FIG. 7, “◯” and “×” shown as the evaluation results of “color development” mean the following.

○: L * (lightness) of Y image part is 60 or more and OD value (density) is 1.00 or more. X: L * (lightness) of Y image part is less than 60, or OD value (density) is 1. Less than 00

(Clogging)
“Clogging” represents clogging that has occurred in the second screen cage 23 used in the pretreatment. In the evaluation of “clogging”, after printing a printed image on 20 printed materials P, the surface of the second screen ridge 23 was washed only once with a cloth moistened with ion-exchanged water, and the washed second screen ridge 23, printing the inspection ink (produced by mixing 1 g of WATERBLUE3 (Dye made by Orient Chemical Industries), 29 g of ion-exchanged water, 70 g of mobile 6750), and printing failure (plate clogging) The number of places was confirmed. In FIG. 7, “◯”, “Δ”, and “x” shown as the evaluation result of “clogging” mean the following.

○: Less than 3 cloggings △: 3 or more cloggings, but not visible from a position 1m or more away ×: 3 or more cloggings, visual approval from a position 1m or more away

(Fine print reproducibility)
“Fine character reproducibility” represents the reproducibility of a character at a predetermined point included in a print image. In FIG. 7, “◯”, “Δ”, and “×” shown as the evaluation results of “fine character reproducibility” mean the following.

○: 12-point characters are not collapsed △: 12-point characters are collapsed, but 16-point characters are not collapsed ×: 16-point characters are collapsed

(Dirty non-printing area)
“Dirt of non-printing area” represents the degree of dirt in the non-printing area of the substrate. The “stain in the non-printing area” was evaluated based on the OD value measured at a specified location 30 mm away from the printing area in the width direction X and the longitudinal direction Y. Specifically, before carrying out each printing method of the comparative example and the example, the OD value before the implementation of the specified location is measured, and after executing each printing method, the OD value after the implementation of the specified location. Was measured. Then, a difference value ΔOD between the pre-execution OD value and the post-execution OD value was calculated to evaluate “dirt of non-printing area”. In FIG. 7, “◯”, “Δ”, and “×” shown as the evaluation results of “non-printing area” mean the following.

○: ΔOD is less than 0.05 Δ: ΔOD is 0.05 or more and less than 0.1 ×: ΔOD is 0.1 or more

<Evaluation results>
As shown in FIG. 7, in Comparative Example 1, since the base treatment process was printed by the inkjet method, the printing time was long. Further, since the ink discharge amount is small in the ink jet system, the hiding property by the white ink cannot be sufficiently obtained, and the color developability is not sufficient. Further, in Comparative Example 1, stains in the non-printing area were also observed due to the pretreatment liquid applied in the preparation process.

  In Comparative Example 2, the printing process was executed by the screen printing method, so the printing time was long.

  In Comparative Example 3, although the printing time was short, the color ink dot coalescence occurred on the white ink, color development was not sufficiently obtained, and fine character reproducibility was not sufficient.

  In Comparative Example 4, although the printing time was short, as in Comparative Example 3, color ink dot coalescence occurred on the white ink, color development was not sufficiently obtained, and fine character reproducibility was not sufficient. It was. Further, in Comparative Example 4, the non-printing area was also stained by the pretreatment liquid applied in the preparation process.

  On the other hand, the evaluation results of Examples 1 to 6 were good in both printing time and color developability.

  That is, an embodiment provided with a base processing step of applying white ink by a screen printing method, a pre-processing step of applying a pretreatment liquid to a base image, and a main printing processing step of printing a print image by an ink jet method It was proved that Nos. 1 to 6 can suppress an increase in printing time while more reliably improving the ink color developability of the printed image.

  In particular, in Examples 4 to 6, since the first screen plate 10 having a larger number of meshes was used in the ground treatment process for applying the white ink, in addition to the printing time and color developability, clogging and fine character reproduction were performed. It proved to be good in terms of sex.

[Other Embodiments of the Present Invention]
Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification.

  For example, in the above-described embodiment, the case where the first screen plate 10 includes the first film sheet 11 in which the opening 11a is formed is described as an example. However, the present invention is not limited to this. The first screen plate 10 may be formed by forming an emulsion film on the first screen plate 13 and then forming an opening 11a by exposure or the like. Similarly, the second screen plate 20 may be formed by forming an emulsion film on the first screen plate 13 and then forming an opening 21a by exposure or the like.

  From the viewpoint of efficiently producing the first screen plate 10 and the second screen plate 20, the first screen plate 10 includes the first film sheet 11 in which the opening 11 a is formed by heat drilling using a heating method. It is preferable that the second screen plate 20 includes the second film sheet 21 in which the opening 21a is formed by thermal perforation using a heating method.

  In addition, the printing method according to the above-described embodiment can generate a printed material by printing a print image on the printing area Pa of the printing material P. For this reason, the printing method which concerns on embodiment mentioned above is applicable also to a printed matter manufacturing method.

  In the printing method according to the above-described embodiment, the first mesh number of the first screen ridge 13 is configured to be larger than the second mesh number of the second screen ridge 23. However, the present invention is not limited to this. . For example, the first mesh number and the second mesh number may be equal, or the first mesh number may be smaller than the second mesh number.

  As described above, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiment.

DESCRIPTION OF SYMBOLS 10 ... 1st screen plate 11 ... 1st film sheet 11a ... Opening part 12 ... 1st plate frame 13 ... 1st screen trough 20 ... 2nd screen plate 21 ... 2nd film sheet 21a ... Opening part 22 ... 2nd plate frame 23 ... 2nd screen 30 ... Inkjet head P ... Substrate Pa ... Print area PS ... Pretreatment liquid WK ... White ink

Claims (3)

A printing method for printing a print image on a print area of a substrate,
Using a screen plate having an opening corresponding to the printing area, a step A of applying white ink to the printing area by a screen printing method;
Step B for applying a pretreatment liquid containing at least a polyvalent metal salt to the printing region;
And a step C of printing the print image on the print region by an ink jet method. 2. The process B according to claim 1, wherein the pretreatment liquid is applied to the printing area by a screen printing method using another screen plate having an opening corresponding to the printing area. Printing method. The screen plate used in the step A includes a first screen ridge constituted by a first mesh number,
The other screen plate used in the step B includes a second screen ridge constituted by a second mesh number,
The printing method according to claim 2, wherein the first mesh number is larger than the second mesh number.

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