CN-118003788-B - Ink jet method and ink jet device

Abstract

The invention provides an ink jet method and an ink jet device, which can improve the balance of color reproduction range and bleeding. The inkjet recording method includes a step of ejecting a radiation-curable first composition having a hue angle of-50 to-5 DEG from an inkjet head, a step of ejecting a radiation-curable second composition having a hue angle of 5 to 50 DEG from an inkjet head, and an irradiation step of irradiating the ejected first composition with radiation within 1 second after landing and irradiating the ejected second composition with radiation within 1 second after landing, thereby curing the composition.

Inventors

• NAKANO KEITARO
• SANO TSUYOSHI
• Zhai Tengche

Assignees

• 精工爱普生株式会社

Dates

Publication Date

20260512

Application Date

20190829

Priority Date

20180831

Claims (13)

1. 1. An inkjet method, comprising: a step of ejecting a radiation-curable first composition having a hue angle of-50 to-5 DEG from an inkjet head; a step of ejecting a radiation-curable second composition having a hue angle of 5-50 DEG from an inkjet head; a step of ejecting a radiation-curable cyan composition from an inkjet head; a step of ejecting a radiation-curable yellow composition from an inkjet head; a step of discharging a radiation-curable third composition having a larger hue angle than the second composition and a lower hue angle than the yellow composition from an inkjet head, and An irradiation step of irradiating the first composition to be discharged within 1 second after landing, irradiating the second composition to be discharged within 1 second after landing, and irradiating the third composition to be discharged within 1 second after landing to cure the composition, In the case of the method of ink-jet printing, An LED is used as a radiation source of the radiation in the irradiation step, The first composition, the second composition and the third composition include an acylphosphine oxide compound as a polymerization initiator, The first composition, the second composition and the third composition are nonaqueous compositions containing 60 to 98 mass% of a polymerizable compound relative to the total amount of the ink, The acyl phosphine oxide compound is more than one of bis (2, 4, 6-trimethyl benzoyl) -phenyl phosphine oxide, 2,4, 6-trimethyl benzoyl-diphenyl-phosphine oxide and bis- (2, 6-dimethoxy benzoyl) -2, 4-trimethyl amyl phosphine oxide.
2. 2. The method of inkjet according to claim 1 wherein, The difference in hue angle between the first composition and the second composition is 10-35 °.
3. 3. The method of inkjet according to claim 1 wherein, The color phase angle of the first composition is-30 to-10 degrees, The hue angle of the second composition is 10-40 degrees.
4. 4. The method of inkjet according to claim 1 wherein, The first composition comprises one or more pigments selected from the group consisting of P.R.31, 122, 202, 207, 209, 147, 269, P.V.32 and 19, The second composition includes one or more pigments selected from the group consisting of p.r.166, 168, 149, 177, 179, 254, 255, 264, 242, and 224.
5. 5. The method of inkjet according to claim 1 wherein, The irradiation energy of the radiation in the irradiation step is 5-2000 mJ/cm 2 .
6. 6. The inkjet method according to claim 1, characterized in that the inkjet method further comprises: And a step of further irradiating each composition with radiation after 1 second after the irradiation step and after each composition landed.
7. 7. The method of inkjet according to claim 1 wherein, The first composition and the second composition comprise 2- (2-ethyleneoxyethoxy) ethyl acrylate.
8. 8. The method of inkjet according to claim 1 wherein, The content of the pigment in the first composition is 2 mass% or less with respect to the total amount of the first composition, The content of the pigment in the second composition is 2 mass% or less with respect to the total amount of the second composition.
9. 9. The inkjet method according to claim 1, characterized in that the inkjet method further comprises: and ejecting the radiation-curable transparent composition from the inkjet head.
10. 10. The method of inkjet according to claim 1 wherein, The irradiation peak wavelength of the LED is 350-420 nm.
11. 11. The inkjet method according to claim 1, characterized in that the inkjet method comprises: And an irradiation step of irradiating the cyan composition discharged by the discharge within 1 second after the landing and irradiating the yellow composition discharged by the discharge within 1 second after the landing with radiation to cure the composition.
12. 12. The method of inkjet according to claim 1 wherein, The irradiation peak intensity of the radiation in the irradiation step is 1500mW/cm 2 or more.
13. 13. An inkjet device, comprising: an inkjet head for carrying out the inkjet method according to any one of claims 1 to 12, and A source of radiation.

Description

Ink jet method and ink jet device The present application is a divisional application of patent application entitled "inkjet method and inkjet device" having application date 2019, 8, 29, 201910808476.0, and incorporated herein by reference in its entirety. Technical Field The present invention relates to an inkjet method and a recording apparatus. Background The inkjet recording method can record a high-definition image using a relatively simple apparatus, and has been rapidly developed in various aspects. For example, patent document 1 discloses an active energy ray-curable inkjet ink which is excellent in pigment dispersibility, ejection stability, and storage stability and which is composed of a polymer dispersant, a monomer, a diketopyrrolopyrrole pigment, and a pigment derivative represented by a specific general formula. Patent document 1 Japanese patent laid-open No. 2006-348200 However, from the ink composition described in patent document 1, it is known that there is room for improvement in the balance between the color reproduction range and bleeding. Disclosure of Invention The inventors of the present invention have made intensive studies to solve the above problems. As a result, it has been found that the above problems can be solved by using two ink compositions having a predetermined hue angle under a predetermined condition, and the present invention has been completed. Specifically, the inkjet method of the present invention comprises a step of discharging a first radiation-curable composition having a hue angle of-50 to-5 DEG from an inkjet head, a step of discharging a second radiation-curable composition having a hue angle of 5 to 50 DEG from an inkjet head, and a step of curing each composition by irradiation with radiation within 1 second after each discharged composition has landed. The constitution of the present invention may be as follows. An inkjet method includes a step of discharging a radiation-curable first composition having a hue angle of-50 to-5 DEG from an inkjet head, a step of discharging a radiation-curable second composition having a hue angle of 5 to 50 DEG from an inkjet head, and an irradiation step of irradiating the discharged first composition with radiation within 1 second after landing and irradiating the discharged second composition with radiation within 1 second after landing to cure the composition. An inkjet device is provided with an inkjet head for performing the inkjet method, and a radiation source. Drawings Fig. 1 is a schematic cross-sectional view showing the configuration of a line printer. Fig. 2 is a perspective view showing the configuration of the serial printer. Fig. 3 is a schematic diagram showing an outline of a first recording method used in the embodiment. Fig. 4 is a schematic diagram showing an outline of a recording method two used in the embodiment. Fig. 5 is a schematic diagram showing an outline of a third recording method used in the embodiment. Fig. 6 is a schematic diagram showing an outline of a fourth recording method used in the embodiment. Fig. 7 is a schematic diagram showing an outline of a fifth recording method used in the embodiment. Fig. 8 is a schematic diagram showing an outline of a sixth recording method used in the embodiment. Description of the reference numerals A 1-line printer, a 110-feed section, a 120-transfer section, a 130-recording section, a 131-ink-jet head, 132, 133 light sources, a 140-drying section, a 150-discharge section, a 2-serial printer, a 220-transfer section, a 230-recording section, a 231-ink-jet head, 232, 233 light sources, a 234-carriage, a 235-carriage moving mechanism, an F recording medium, a Y-transfer direction, S1, S2 main scanning directions, and T1 sub scanning directions. Detailed Description Hereinafter, embodiments of the present invention (hereinafter, referred to as "the present embodiment") will be described in detail with reference to the drawings as needed, but the present invention is not limited thereto, and various modifications may be made without departing from the spirit thereof. In the drawings, the same elements are denoted by the same reference numerals, and overlapping description thereof is omitted. In addition, unless otherwise specified, the positional relationship between the upper, lower, left, right, etc. is based on the positional relationship shown in the drawings. Moreover, the dimensional proportion of the drawings is not limited to the proportion shown in the drawings. [ Inkjet method ] The inkjet method of the present embodiment includes a step of discharging a radiation-curable first composition having a hue angle of-50 to-5 DEG from an inkjet head, a step of discharging a radiation-curable second composition having a hue angle of 5 to 50 DEG from an inkjet head, and a step of curing each composition by irradiating each composition with radiation within 1 second after each composition is discharged. In signature or label printing, a color region of