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KR-20260064538-A - INKJET INK PRINTING DEVICE AND METHOD FOR PRODUCING PRINTED MATTER

KR20260064538AKR 20260064538 AKR20260064538 AKR 20260064538AKR-20260064538-A

Abstract

[Problem to be Solved] To provide an inkjet printing device and a method for manufacturing printed materials capable of printing with high quality and high productivity on non-absorbent or low-absorbent printing media using an ink containing an organic solvent with low volatility. [Solution] An inkjet head (41) discharges ink to attach it to a non-absorbent or low-absorbent printing medium (P). The ink contains water and an organic solvent S. The water is 3.0 to 10.0 mass% with respect to the total amount of ink, and the organic solvent S contains an organic solvent A with a boiling point of 150°C or higher and less than 200°C. A heater (5) heats the printing medium (P) so that the surface temperature of the printing medium (P) becomes 40 to 43°C in order to dry the ink attached to the printing medium (P). A blower mechanism (9) blows wind with a wind speed of 0.2 to 1.5 m/sec onto the printing medium (P) in order to dry the ink attached to the printing medium (P).

Inventors

  • 야마모토 히로타카
  • 나카타 아미

Assignees

  • 리소 가가쿠 고교 카부시키가이샤

Dates

Publication Date
20260507
Application Date
20251021
Priority Date
20241030

Claims (6)

  1. An inkjet head that ejects ink to attach the ink to a non-absorbent or low-absorbent printing medium; A heating unit for heating the printing medium to dry the ink attached to the printing medium; and A blower unit that blows air onto the printing medium to dry the ink attached to the printing medium; Equipped with, The above ink comprises water and an organic solvent S, and The above water is 3.0 to 10.0 mass% with respect to the total amount of ink, and The above organic solvent S comprises organic solvent A, which has a boiling point of 150°C or higher and less than 200°C, and The heating unit heats the printing medium so that the surface temperature of the printing medium becomes 40 to 43°C, and The above-mentioned blower blows wind with a wind speed of 0.2 to 1.5 m/sec onto the above-mentioned printing medium. Inkjet printing device.
  2. In paragraph 1, The above-described blower unit is an inkjet printing device that blows wind with a wind temperature of 35 to 40°C onto the printing medium under an environment of 23°C and 50% RH.
  3. In paragraph 1 or 2, A main scanning drive unit that moves the above inkjet head in the main scanning direction; A conveying unit that conveys the above-mentioned printing medium in a secondary scanning direction orthogonal to the main scanning direction; and A control unit that controls the inkjet head, the main drive unit, and the return unit to alternately perform the operation of discharging ink from the inkjet head to the printing medium while moving the inkjet head by the printing width in the main drive direction and the operation of returning the printing medium in the sub-draw direction, and to perform printing in a multi-pass manner; further comprising The above control unit sets printing conditions according to the printing width, an inkjet printing device.
  4. In paragraph 3, The above-described control unit further sets the printing conditions according to at least one of the type of printing medium and the printing resolution, an inkjet printing device.
  5. In paragraph 3, An inkjet printing device comprising at least one of the above printing conditions, the amount of ink droplets discharged by the inkjet head, the correspondence between the input and output values of image data of a printing target, and the maximum amount of ink discharged by the inkjet head per unit area.
  6. A step of attaching ink to a non-absorbent or low-absorbent printing medium; A step of heating the printing medium to dry the ink attached to the printing medium; and A step of blowing air onto the printing medium to dry the ink attached to the printing medium; Includes, The above ink comprises water and an organic solvent S, and The above water is 3.0 to 10.0 mass% with respect to the total amount of ink, and The above organic solvent S comprises organic solvent A, which has a boiling point of 150°C or higher and less than 200°C, and In the process of heating the printing medium, the printing medium is heated so that the surface temperature of the printing medium becomes 40 to 43°C, and In the process of blowing wind onto the above-mentioned printing medium, wind with a wind speed of 0.2 to 1.5 m/sec is blown onto the above-mentioned printing medium. Method of manufacturing printed materials.

Description

Inkjet Printing Device and Method for Producing Printed Matter The present invention relates to an inkjet printing device and a method for manufacturing a printed material. When printing on non-absorbent or low-absorbent printing media using an inkjet printing device, inks containing highly volatile organic solvents are often used to prevent image smudging and subsequent degradation of image quality. In addition, in an inkjet printing device, in order to suppress the degradation of image quality due to image blurring and to achieve high productivity, the printing medium from which ink has been ejected is heated and dried by means of a heater or the like (see Patent Documents 1 and 2). [Fig. 1] This is a schematic diagram of an inkjet printing device related to the first embodiment. [Fig. 2] This is a plan view of the main part of the inkjet printing device shown in Fig. 1. [Fig. 3] This is a control block diagram of the inkjet printing device shown in Fig. 1. [Fig. 4] This is a diagram showing the measurement results of the OD value of the black image in the printed material of Example 2. [Fig. 5] This is a diagram showing the measurement results of the OD value of the image of the cyan in the printed material of Example 2. [Fig. 6] This is a diagram showing the measurement results of the OD value of the magenta image in the printed material of Example 2. [Fig. 7] This is a diagram showing the measurement results of the OD value of the yellow image in the printed material of Example 2. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, identical or equivalent parts or components are denoted by identical or equivalent reference numerals. The embodiments described below are examples of devices, etc., for embodying the technical concept of the present invention, and the technical concept of the present invention is not limited to the materials, shapes, structures, arrangements, etc. of each component as described below. Various modifications may be added to the technical concept of the present invention within the scope of the claims. [First embodiment] FIG. 1 is a schematic diagram of an inkjet printing device related to a first embodiment of the present invention. FIG. 2 is a plan view of the main part of the inkjet printing device shown in FIG. 1. FIG. 3 is a control block diagram of the inkjet printing device shown in FIG. 1. In addition, in the following description, the up-down front-back direction indicated by the arrow in FIG. 1 is defined as the up-down front-back direction of the inkjet printing device. Furthermore, the left-right direction viewed from the front is defined as the left-right direction of the inkjet printing device. As shown in FIGS. 1 to 3, the inkjet printing device (1) related to the first embodiment is equipped with a transport unit (2), a platen (3), a fan (4), a heater (corresponding to a heating unit) (5), a main injection drive guide (6), a main injection drive motor (7), a head unit (8), a blower mechanism (corresponding to a blower unit) (9), a control unit (10), and an outer cover (11) covering the head unit (8), etc. The return unit (2) returns a strip-shaped printing medium (P). In the inkjet printing device (1), as the printing medium (P), a non-absorbent printing medium that does not absorb ink, or a low-absorbent printing medium that is difficult to absorb ink is used. The non-absorbent printing medium is not particularly limited, but examples include sheets, films, and fiber products containing non-absorbent materials. Additionally, the non-absorbent printing medium may be provided with a layer containing a non-absorbent material (hereinafter also referred to as a "low-absorbent layer") on the surface of a substrate (e.g., paper, fiber, leather, plastic, glass, ceramics, metal, etc.). The non-absorbent material is not particularly limited, but examples include olefin resins, ester resins, urethane resins, acrylic resins, vinyl chloride resins, etc. In addition, non-absorbent printing media are not particularly limited, but examples include films or plates made of plastics such as polyvinyl chloride, polyethylene, polypropylene, and polyethylene terephthalate (PET), plates made of metals such as iron, silver, copper, and aluminum, or metal plates or plastic films made by deposition of these various metals, and plates made of alloys such as stainless steel or brass. Examples of low-absorbency printing media include art paper, coated paper, and cast paper used in general offset printing, which have relatively low ink permeability. These are formed on a substrate such as paper with a coating layer having relatively low ink permeability, and are also called coated paper. The coating layer is a layer composed of resins, inorganic compounds, etc., which have low water absorption and are a layer with low ink absorption. As shown in FIGS. 1 to 3, the conveying unit (2) is equipped with a supply drive motor (21),