WO2004069543A1 - インクジェット記録方法及びインクジェットプリンタ - Google Patents
インクジェット記録方法及びインクジェットプリンタ Download PDFInfo
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- WO2004069543A1 WO2004069543A1 PCT/JP2004/000469 JP2004000469W WO2004069543A1 WO 2004069543 A1 WO2004069543 A1 WO 2004069543A1 JP 2004000469 W JP2004000469 W JP 2004000469W WO 2004069543 A1 WO2004069543 A1 WO 2004069543A1
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- 239000004677 Nylon Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 235000010582 Pisum sativum Nutrition 0.000 description 1
- 240000004713 Pisum sativum Species 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
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- 239000005083 Zinc sulfide Substances 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- 229940045714 alkyl sulfonate alkylating agent Drugs 0.000 description 1
- 150000008052 alkyl sulfonates Chemical class 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
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- 150000001450 anions Chemical class 0.000 description 1
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 1
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- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
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- 239000012948 isocyanate Substances 0.000 description 1
- PXZQEOJJUGGUIB-UHFFFAOYSA-N isoindolin-1-one Chemical compound C1=CC=C2C(=O)NCC2=C1 PXZQEOJJUGGUIB-UHFFFAOYSA-N 0.000 description 1
- GWVMLCQWXVFZCN-UHFFFAOYSA-N isoindoline Chemical compound C1=CC=C2CNCC2=C1 GWVMLCQWXVFZCN-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 235000010187 litholrubine BK Nutrition 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
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- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- PZYDAVFRVJXFHS-UHFFFAOYSA-N n-cyclohexyl-2-pyrrolidone Chemical compound O=C1CCCN1C1CCCCC1 PZYDAVFRVJXFHS-UHFFFAOYSA-N 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000013054 paper strength agent Substances 0.000 description 1
- UWJJYHHHVWZFEP-UHFFFAOYSA-N pentane-1,1-diol Chemical compound CCCCC(O)O UWJJYHHHVWZFEP-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 229960005323 phenoxyethanol Drugs 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 229940099800 pigment red 48 Drugs 0.000 description 1
- 229940104573 pigment red 5 Drugs 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- HXHCOXPZCUFAJI-UHFFFAOYSA-N prop-2-enoic acid;styrene Chemical compound OC(=O)C=C.C=CC1=CC=CC=C1 HXHCOXPZCUFAJI-UHFFFAOYSA-N 0.000 description 1
- FYNROBRQIVCIQF-UHFFFAOYSA-N pyrrolo[3,2-b]pyrrole-5,6-dione Chemical compound C1=CN=C2C(=O)C(=O)N=C21 FYNROBRQIVCIQF-UHFFFAOYSA-N 0.000 description 1
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 1
- IZMJMCDDWKSTTK-UHFFFAOYSA-N quinoline yellow Chemical compound C1=CC=CC2=NC(C3C(C4=CC=CC=C4C3=O)=O)=CC=C21 IZMJMCDDWKSTTK-UHFFFAOYSA-N 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- WPPDXAHGCGPUPK-UHFFFAOYSA-N red 2 Chemical compound C1=CC=CC=C1C(C1=CC=CC=C11)=C(C=2C=3C4=CC=C5C6=CC=C7C8=C(C=9C=CC=CC=9)C9=CC=CC=C9C(C=9C=CC=CC=9)=C8C8=CC=C(C6=C87)C(C=35)=CC=2)C4=C1C1=CC=CC=C1 WPPDXAHGCGPUPK-UHFFFAOYSA-N 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 239000000516 sunscreening agent Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229910002029 synthetic silica gel Inorganic materials 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- YODZTKMDCQEPHD-UHFFFAOYSA-N thiodiglycol Chemical compound OCCSCCO YODZTKMDCQEPHD-UHFFFAOYSA-N 0.000 description 1
- 229950006389 thiodiglycol Drugs 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- LMRVIBGXKPAZLP-UHFFFAOYSA-N trimethyl-[2-methyl-2-(prop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC(C)(C)NC(=O)C=C LMRVIBGXKPAZLP-UHFFFAOYSA-N 0.000 description 1
- VUEZMURBIBNRIB-UHFFFAOYSA-O trimethyl-[3-methyl-3-(prop-2-enoylamino)butyl]azanium Chemical compound C[N+](C)(C)CCC(C)(C)NC(=O)C=C VUEZMURBIBNRIB-UHFFFAOYSA-O 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
- B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
Definitions
- the present invention relates to an ink jet recording method and an ink jet printing method, and more particularly to an ink jet recording method and an ink jet printing method for discharging an ink for improving glossiness onto a recording medium.
- Ink jet printing which forms an image by ejecting micro-droplets of ink onto the recording surface of a recording medium, has achieved high image quality approaching silver halide photography and low cost of the device due to recent technological advances. Due to its rapid spread.
- dye ink is mainly used.
- Dye inks are soluble in solvents, exhibit high purity and vivid coloration, and because they have no particle properties, they do not generate scattered or reflected light, and they have high transparency and a clear hue. Excellent for printing high quality images.
- the dye molecules are destroyed by photochemical reactions, etc., there is a problem that light resistance is poor because the decrease in the number of molecules directly affects the coloring density.
- colorants that are advantageous in light resistance, ozone resistance and the like have been proposed.
- Typical examples are pigment inks that have already been put into practical use.
- a recording medium having a very high gloss such as a swelling type mainly composed of a water-soluble binder is used, or a mixed layer of thermoplastic fine particles and inorganic fine particles is provided on the surface layer of the void type recording medium.
- the image is subjected to post-processing such as heat and pressure fixing (see, for example, Patent Documents and European Patent Application Publication No. 12228891).
- High image gloss can be obtained.
- pigment inks and wax inks often contain a resin in the ink for the purpose of improving the dispersibility of the colored particles, the abrasion of the image, or the gloss of the image.
- the ink jet recording method of the present invention includes discharging a recording ink containing a coloring material onto a recording medium by a recording head, and adding a colorless ink for improving glossiness to the recording head. And discharges the recording medium onto the recording medium to form an image.
- the amount of the colorless ink per unit area is determined according to the amount of the recording ink per unit area.
- a recording ink containing a color material is ejected to a recording medium by a recording head, and a colorless ink for improving gloss is ejected to the recording medium by the recording head to form an image.
- the control unit may determine the amount of the colorless ink adhered per unit area by the recording ink. Is determined according to the amount of adhesion per unit area.
- image formation is performed by discharging recording ink to a recording medium and discharging colorless ink for improving glossiness to the recording medium. Therefore, even if the color material contained in the recording ink improves the gloss of the image forming area, the colorless ink is ejected to a white background or a highlight part where the amount of the recording ink is small, so that the gloss of these parts can be improved. Performance can be improved. In particular, since the amount of colorless ink adhered per unit area is determined according to the amount of recording ink adhered per unit area, the gloss of the recording surface of the recording medium can be made uniform, resulting in uneven gloss. It can improve discomfort.
- the colorless ink used in the present invention is an ink which does not substantially contain a coloring material, and preferably has a ⁇ change of 3 or less in an image portion depending on the presence or absence of the colorless ink.
- the gloss imparting function as used herein means that the specular gloss (JIS-Z-8741) and the image clarity (JIS-K-7105) have been improved.
- the 60-degree specular gloss of the image-formed surface was measured according to JIS-Z-8741.
- a variable-angle gloss system (VGS-1001DP) manufactured by Nippon Denshoku Industries Co., Ltd. was used. Further, in the inkjet recording method of the present invention,
- the discharge position of the colorless ink may be determined according to the discharge position of the recording ink.
- the control unit may determine a discharge position of the colorless ink according to a discharge position of the recording ink.
- the discharge position of the colorless ink is determined according to the discharge position of the recording ink, it is possible to discharge the colorless ink to a suitable position with respect to the discharge position of the recording ink. .
- the discharge position of the colorless ink may be preferentially determined from a position adjacent to or not overlapping the discharge position of the recording ink.
- the control unit may preferentially determine the discharge position of the colorless ink from a position adjacent to or not overlapping the discharge position of the recording ink.
- the colorless ink ejection position is determined preferentially from a position adjacent to or not overlapping with the recording ink ejection position, the colorless ink and the transparent ink are mixed on the recording medium. Can be prevented.
- the amount of the colorless ink may be larger than an area where the amount of the ink adhered to the recording ink is larger than a predetermined amount.
- the control unit includes:
- the amount of the colorless ink is larger than in a region where the amount of the recording ink is larger than a predetermined amount.
- the colorless ink adhesion amount is increased as compared with the area where the recording ink adhesion amount is larger than the predetermined amount.
- the amount of colorless ink adhering becomes smaller than in the region where the amount is smaller, and it becomes difficult to discharge ink that exceeds the allowable ink absorption amount of the recording medium. Therefore, it is possible to prevent liquid overflow that occurs because the recording medium cannot absorb the ink.
- the unit area of the adhesion amount in the colorless ink and the recording ink may be 1 mm square or less, and the total amount of the adhesion of the colorless ink and the recording ink in the unit area may be a predetermined amount or more.
- the control unit includes:
- the unit area of the adhesion amount in the colorless ink and the recording ink is 1 mm square or less, and the adhesion of the colorless ink and the recording ink in the unit area is
- the total amount may be equal to or more than a predetermined amount.
- the amount of ink adhered in the ink jet recording method means the amount adhered to a fixed area of the recording medium, that is, the amount adhered per unit area.
- the unit is the widest surface area of the recording medium, and the smallest unit is one pixel corresponding to the recording resolution.
- the control unit there is a certain maximum value as a control unit for discharging the colorless ink, and it is desirable that the control unit be smaller than that maximum value.
- the maximum control unit in order to improve the uniformity of the glossiness of the recording surface by discharging the colorless ink, the maximum control unit must be 2 mm or less, more preferably 0.5. It was found to be in mm square units. Regarding the resolution of the human eye, the sensitivity is highest at an interval of 0.5 mm when the distance between the eye and the recording medium is about 30 cm. Therefore, when ensuring uniformity of black density on the recording surface by the dots of the recording head, the dots need to be distributed at a higher spatial frequency.
- the dot interval (so-called number of lines) is 150-175, and the spatial frequency is 0.169-0.145 mm.
- the resolution of the human eye is not so high, and even if glossy and non-glossy parts are evenly distributed at intervals of about 1 mm, there is no such feeling of discomfort. Do you get it.
- the unit area of the colorless ink and the recording ink in the color ink and the recording ink is 1 mm square, and the total amount of the colorless ink and the recording ink in the unit area is a predetermined amount.
- the uniformity of the gloss of the recording surface can be further improved, and the sense of incongruity due to uneven gloss can be improved. If the area smaller than 1 mm square is set as the unit area, higher uniformity can be obtained.However, considering the calculation time required for this, it is necessary to control in a unit of necessary and sufficient size. It is clear that is the most efficient.
- the total amount of the adhesion amount of the colorless ink and the recording ink in the unit area is , 2 cc Zm 2 or more.
- the control unit includes:
- the total amount of the adhesion amounts of the colorless ink and the recording ink in the unit area may be 2 cc / m 2 or more.
- the uniformity of gloss on the recording surface can be more stably improved.
- the total amount of the adhesion amounts of the colorless ink and the recording ink in the unit area is less than 13 cc Zm 2 .
- the control unit includes:
- the total amount of the colorless ink and the recording ink in the unit area is less than 13 cc Zm 2 .
- the total amount of colorless Inku and attachment of the recording Inku within a unit area was 1 3 cc / m 2 or more, a risk that exceeds the allowable Inku absorption amount of the recording medium occurs the overflow liquid is is there. Therefore, as in the above-mentioned Inkuje' Bok recording method and Inku jet printer, the total amount of adhesion amount of clear ink and the recording ink in the unit area, overflow by setting to less than 1 3 cc / m 2 liquid.
- the unit area of the adhesion amount in the colorless ink and the recording ink is a block including a set of n pixels ( ⁇ > 1).
- the control unit includes:
- the unit area of the adhesion amount in the colorless ink and the recording ink may be a block composed of a set of n pixels ( ⁇ > 1).
- the dither matrix is a technique that does not require much image quality, but is used when high-speed output is desired. The effect of calculating the amount of colorless ink deposited at high speed is great.
- the ejection position of the colorless ink ejected into the block may be determined from a pixel having a small amount of the recording ink applied.
- the control unit includes:
- the discharge position of the colorless ink to be discharged into the block may be determined from pixels having a small amount of the recording ink attached.
- the discharge position of the colorless ink to be discharged into the block is determined from the pixels having a small amount of the applied recording ink, it is possible to preferentially discharge the pixels from which the recording ink is not discharged, Effective from the viewpoint of ink overflow and uniformity of gloss.
- the unit area of the adhesion amount in the colorless ink and the recording ink may be one pixel, and the total amount of the adhesion amount of the colorless ink and the recording ink in the unit area may be a predetermined amount or more.
- the control unit includes: The unit area of the adhesion amount in the colorless ink and the recording ink may be one pixel, and the total amount of the adhesion amount of the colorless ink and the recording ink in the unit area may be a predetermined amount or more.
- the unit area of the adhesion amount in the colorless ink and the recording ink is set to one pixel, and the total amount of the adhesion of the colorless ink and the recording ink in the unit area is equal to or more than the predetermined amount. It is possible to determine the amount of ink adhesion.
- the amount of colorless ink adhered can be calculated using the image data before halftone processing. It is also possible to calculate the colorless ink ejection position by performing the same processing as the halftone processing. Further, in the ink jet recording method of the present invention,
- the recording ink may contain fine particles.
- the recording ink may contain fine particles.
- the effect of improving the gloss uniformity according to the present invention is effective in a combination of a recording medium and an ink whose gloss is improved by adhering the recording ink to the recording medium, and limiting each material itself at all.
- it is particularly effective in a system using a material that exhibits this phenomenon remarkably.
- examples of such a material include a case where the recording ink itself contains fine particles other than the coloring material, such as the above-described ink jet recording method and an ink jet printer, a case where the coloring material itself is a fine particle, and a case where both of the two are included.
- the recording medium may be a gap type recording medium.
- the recording medium may be a gap type recording medium.
- the recording medium is a gap type recording medium
- the ink absorption rate is higher than that of the swelling type recording medium, and the recording medium corresponds to the image forming speed of high-speed image forming printing. Ink can be absorbed. This makes it possible to achieve both glossiness and ink absorbency.
- the surface layer of the recording medium may contain a thermoplastic resin.
- the surface layer of the recording medium may contain a thermoplastic resin.
- the surface layer of the recording medium contains a thermoplastic resin, this effect is particularly effective when heating or pressure fixing is performed after recording, or when the above ink and medium are used in combination. Is high.
- the recording medium from which the recording ink and the colorless ink have been discharged may be subjected to a fixing process including heating or pressing.
- the recording medium from which the recording ink and the colorless ink have been discharged may be subjected to a fixing process including heating or pressing.
- the surface layer of the recording medium contains a thermoplastic resin
- further excellent gloss can be obtained by melting or coating the recording ink and the colorless ink attached to the recording medium. That is, according to the above-described ink jet recording method and ink jet printer, by fixing the recording ink and the colorless ink to the recording medium by a fixing process including heating or pressurizing, these inks can be melted or formed into a film. The gloss can be further improved.
- the rate of change in absorbance when the recording ink and the colorless ink are mixed may be less than 5% '.
- the rate of change in absorbance when the recording ink and the colorless ink are mixed may be less than 5%.
- the rate of change in absorbance when the recording ink and the colorless ink are mixed is 5% or more, for example, when the recording ink and the colorless ink are mixed in the nozzle of the recording head, no This can cause clogging of the whiskers, which can result in lower image quality and lower gloss.
- nozzle clogging can be prevented by setting the rate of change in absorbance when the recording ink and colorless ink are mixed to less than 5%, as in the ink jet recording method and the ink jet printing described above.
- a recording ink containing a color material is ejected onto a recording medium by a recording head, and a colorless ink for improving glossiness is ejected onto the recording medium by the recording head to form an image.
- the rate of change in absorbance when the recording ink and the colorless ink are mixed is less than 5%.
- the ink jet pudding of the present invention is:
- a recording ink containing a color material is ejected to a recording medium by a recording head, and a colorless ink for improving gloss is ejected to the recording medium by the recording head to form an image.
- the rate of change in absorbance when the recording ink and the colorless ink are mixed is less than 5%.
- the image formation is performed by ejecting recording ink onto the recording medium and ejecting colorless ink for improving glossiness onto the recording medium, the image formation is performed using the coloring material contained in the recording ink. Even if the glossiness of the area is improved, the glossiness of these areas can be improved by discharging the colorless ink to a white background portion or a highlight portion where the amount of the recording ink is small. Further, since the rate of change in absorbance when the recording ink and the colorless ink are mixed is set to less than 5%, clogging of the nozzles can be prevented, and deterioration in image quality and gloss can be prevented.
- FIG. 1 shows main components of an ink jet printing apparatus according to the first embodiment. It is a perspective view.
- FIG. 2 is an enlarged perspective view of a carriage provided in the ink jet printer of FIG.
- FIG. 3 is a bottom view of the recording head mounted on the carriage of FIG.
- FIG. 4 is a front view showing the main components of a fixing unit provided in the ink jet printer of FIG.
- FIG. 5 is a block diagram showing a control circuit of the ink jet printer of FIG.
- FIG. 6 is a waveform diagram showing a voltage waveform for driving the recording head of FIG.
- FIG. 7 is a block diagram illustrating a main control unit of the image forming apparatus connected to the inkjet printer of FIG.
- FIG. 8 is a flowchart showing an outline of processing of the halftone module performed in the image forming apparatus of FIG.
- FIG. 9A and FIG. 9B are explanatory diagrams illustrating the colorless ink ejection position when the unit area is a block composed of 2 ⁇ 2 pixels and when the unit area is a block composed of 4 ⁇ 4 pixels. .
- FIG. 10 is a flowchart illustrating an outline of a halftone module process performed in the image forming apparatus according to the second embodiment.
- FIG. 11A, FIG. 11B and FIG. 11C are specific examples of recording ink and colorless ink ejection positions when the total amount of adhesion between the colorless ink and the recording ink is 25%.
- FIGS. 12A and 12B are specific examples of the ejection positions of the recording ink and the colorless ink when the total amount of adhesion between the colorless ink and the recording ink is 25%.
- FIGS. 13A and 13B are specific examples of the recording ink and colorless ink ejection positions when the total amount of adhesion between the colorless ink and the recording ink is 25%.
- FIGS. 14A, 14B, and 14C are specific examples of the ejection positions of the recording ink and the colorless ink when the total amount of adhesion between the colorless ink and the recording ink is 50%.
- FIG. 15 is an explanatory diagram illustrating an example of assigning recording inks for each gradation level in the first embodiment.
- FIG. 16 is a graph in which the ink amount of the patch of each gradation level in the first embodiment is plotted for each ink.
- FIG. 17A, FIG. 17B, and FIG. 17C are explanatory diagrams illustrating the colorless ink ejection position for each layer amount when the total amount of the attached amount in Example 1 is changed. .
- FIG. 18 is a daraf representing the gloss measurement of a 25-100% patch in Example 1.
- FIG. 19 is a graph plotting the ink amounts of the patches of each gradation level in the second embodiment.
- FIG. 20 is a graph showing the 60-degree gloss value when the colorless ink in Example 2 was changed from 25 to 100%.
- FIG. 21A and FIG. 21B are explanatory diagrams illustrating the colorless ink ejection position in the third embodiment.
- FIG. 1 is a perspective view showing the main components of an ink jet printer.
- the ink jet printer 1 is provided with an image forming unit 2 that forms an image by discharging ink on a recording medium.
- the image forming unit 2 includes a predetermined area on the back side of the recording medium P (see FIG. 4) on the back side (the side opposite to the recording side).
- the supporting platen 21 is disposed substantially horizontally.
- the image forming section 2 is provided with a guide member 25 that extends along the scanning direction X above the platen 21 and moves the carriage 23 that scans in the scanning direction X. ing.
- the carriage 23 has a recording head 22 for ejecting ink to a recording medium, and an optical pattern extending along the scanning direction X at a period of 180 dpi in the longitudinal direction.
- a linear encoder sensor 27 that reads the optical pattern of the linear scale 26 and outputs it as a clock signal is mounted.
- the moving direction of the carriage 23 is changed in accordance with the rotation direction of the carriage drive motor 231, whereby the carriage 23 reciprocates in the scanning direction X.
- the carriage 23 moves forward, backward or forward and backward in the scanning direction X when the recording medium P is stopped.
- the moving speed at this time is, for example, 705 mmZs at the highest speed.
- FIG. 2 is an enlarged perspective view of the carriage 24, and FIG. 3 is a bottom view of the recording head 22.
- the recording head 22 may be of a piezo type, a thermal type, or a continuous type, but is preferably a piezo type from the viewpoint of stability with pigment ink.
- the piezo type recording head 2 is used. 2 is used.
- the recording head 22 has a recording surface of the recording medium P conveyed on the platen 21 and a nozzle surface 2 on which the nozzles 22 of the recording head 22 are formed. 22 are arranged to face each other.
- the nozzle surface 2 2 2 of the recording head 2 2 has approximately 5 rows of 255 nozzles 22 1 at a pitch of 14 lim (180 dpi) in the transport direction.
- the nozzle rows formed side by side are displaced by 23.5 m. This corresponds to one pixel in 1080 dpi.
- This is for compensating that the nozzles 221, which can be driven simultaneously, are every three nozzles as a drive mechanism of the recording head 22.
- Each recording head 22 is provided with ejection means (not shown) such as a piezo element (piezoelectric element) inside, and the ink is separately ejected from each nozzle 22 1 as droplets by the operation of the ejection means. .
- Each recording head 22 has a recording ink cartridge (not shown) and a colorless ink Ink is supplied from the cartridge through a piping tube.
- Eight recording heads 22 are arranged side by side in the scanning direction, and are used for the six shades of CMK, Y, and colorless ink, respectively.
- seven types of inks, C, M, Y, K, LC, LM, and LK, are used as recording inks, but printing is performed using only dark colors C, M, Y, and ⁇ without using light colors.
- the effects of the present invention are the same even in an ink jet printing.
- FIG. 4 is a front view illustrating main components of the fixing unit 4.
- the fixing unit 4 is disposed downstream of the image forming unit 2 in the transport direction of the recording medium.
- the fixing unit 4 is provided with a transport roller 42 that extends in a direction perpendicular to the transport direction of the recording medium ⁇ ⁇ and supports and transports the recording medium ⁇ ⁇ from below.
- a heating roller 41 composed of a hollow roller is opposed to the upper side of the transport roller 42.
- a heat source 43 such as a halogen lamp heater, a ceramic heater, and a nichrome wire is provided, and the heating roller 41 is heated by the heat of the heat source 43 so that the ink on the recording medium ⁇ is heated.
- the thermoplastic resin particles contained in the receiving layer are melted.
- the heating roller 41 has a built-in temperature sensor 4 13 (see FIG. 5). Further, a gear 412 is formed on the peripheral edge of the end of the heating roller 411, and meshes with a gear 441 attached to the driving motor 440 for the heating roller. The driving force of the driving motor 44 for the heating roller is transmitted to the heating roller 41 by the gears 441 and the gear 441, and is driven to rotate in a predetermined direction.
- the heating roller 41 is preferably formed of a material having a high thermal conductivity so that the recording medium can be efficiently heated by the heat generated from the heat source 43, and examples thereof include a metal roller.
- the surface is preferably coated with a fluororesin in order to prevent contamination due to ink when the recording medium is heated and pressurized.
- a silicon rubber roller coated with heat-resistant silicon rubber can be used.
- FIG. 5 is a block diagram showing a control circuit of the ink jet printer 1.
- the control circuit 100 includes a transport mode 101 for transporting the recording medium P, a recording medium type determination sensor 1002 for determining the type of the recording medium P, and a CPU 10. 3, interface 104, drive motor for carriage 2 31 1, drive motor for heating roller 44, temperature sensor 41, heat source 43, memory light controller 105, image memory 106, memory read A controller 107, a head dryno 108, and a recording head 22 are connected via a bus 110.
- the control circuit 100 is also connected to each drive unit of the ink jet printer 1 in addition to the above.
- the control circuit 100 controls the conveyance of the recording medium P, the scanning operation of the carriage 23, the ink ejection of the recording head F22, and the like.
- the pixel clock having a period of 33 S is equivalent to three periods, that is, each recording is performed during 100 s.
- the data of 255 pixels in each column of the head 22 is read out and transferred to the head dryer 108.
- the head dryno 108 generates a ternary head drive pulse signal corresponding to each nozzle 222 at a timing corresponding to the phase of each nozzle 222. That is, if the data is “0”, no pulse signal is generated, if “1”, one pulse is generated, and if “2”, two pulses are generated at intervals of about 10 s.
- the head drive pulse of each of the ABC phases is generated at a timing shifted by 33/2 s for one pixel clock.
- an image forming apparatus 200 such as a computer is connected to the control circuit 100.
- the image forming apparatus 200 forms a multi-color image based on the input signal.
- the application program 201 running inside the image forming apparatus 200 displays an image on the monitor 300 via the video driver 202 while processing the image.
- the printer driver 203 of the image forming apparatus 200 receives image data for image formation from the application program 201, and executes the inkjet printing. In the evening, it is converted to a signal that can form an image. That is, in the present embodiment, the control circuit 100 and the image forming apparatus 200 are the control unit of the present invention.
- the printer driver 203 includes a rasterizer 204 that converts image data handled by the application program 201 into color information in dot units, and a rasterizer 204 that converts image data into color information in dot units.
- Color tone correction module 205 that performs corrections according to the color development characteristics and gradation characteristics of the ink jet printer 1, depending on the presence or absence of recording ink in dot units from the color-corrected image data.
- the half-in module 206 and the half-tone module 206 that generate the so-called half-tone image data that expresses the density in terms of area, that is, the recording ink data that indicates the recording ink ejection position and adhesion amount, etc.
- a colorless ink calculation module 207 is provided that generates a colorless ink data representing the colorless ink ejection position and the amount of adhesion based on the generated recording ink data.
- the recording medium can be applied to all media used for ordinary ink jet recording, but a recording medium having an ink absorbing layer on a support is preferable from the viewpoint of image quality. There is a void type.
- the swelling type it is possible to use, for example, gelatin, polypinyl alcohol, polyvinylpyrrolidone, polyethylene oxide or the like alone or in combination as a hydrophilic binder to form an ink absorbing layer.
- the ink-absorbing layer of the void-type recording medium may have one or two or more layers.
- an ink jet recording medium it is preferable to use an ink jet recording medium.
- the void type ink absorbing layer will be described in more detail.
- the void layer is formed mainly by soft aggregation of the hydrophilic binder and the inorganic pigment.
- various methods for forming voids in a film have been known.For example, a uniform coating solution containing two or more polymers is applied to a support, and these polymers are phase-separated from each other during a drying process. To form voids by solid fine particles and hydrophilic Alternatively, a coating liquid containing a hydrophobic binder is coated on a support, and after drying, the ink jet recording medium is immersed in a liquid containing water or a suitable organic solvent to dissolve solid fine particles to form voids.
- Method a method of forming a void in a film by applying a coating solution containing a compound having a property of foaming at the time of film formation and then foaming the compound in a drying process, containing porous solid fine particles and a hydrophilic binder
- a coating solution containing a binder is applied on a support.
- the porous layer is formed by including various inorganic solid fine particles having an average particle diameter of 100 nm or less in the void layer.
- inorganic pigments used for the above purpose include light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc hydroxide, Zinc sulfide, zinc carbonate, hydrated talcite, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, alumina, colloidal alumina, pseudo-boehmite, aluminum hydroxide, U-tobon, Zeoryi And white inorganic pigments such as magnesium hydroxide.
- the average particle size of the inorganic pigment is calculated by observing the particles themselves or the particles that have appeared on the cross section or surface of the void layer with an electron microscope, calculating the particle size of 100 arbitrary particles, and calculating the simple average value ( (Number average).
- the particle size of each particle is represented by the diameter assuming a circle equal to the projected area.
- the solid fine particles it is preferable to use solid fine particles selected from silicic acid and alumina or alumina hydrate, and silica is more preferable.
- silica silica, colloidal silica synthesized by an ordinary wet method, or silicic acid synthesized by a gas phase method is preferably used, and colloidal silica used particularly preferably in the present invention is colloidal silica.
- the fine-particle silica obtained by the gas-phase method not only provides a high porosity but also a cationic polymer used for the purpose of immobilizing the dye. This is preferable because coarse aggregates are hardly formed when they are added at once.
- Alumina or alumina hydrate may be crystalline or amorphous, and may have any shape such as irregular shaped particles, spherical particles, and acicular particles.
- the fine particles are preferably in a state where the fine particle dispersion before being mixed with the cationic polymer is dispersed to primary particles.
- the particle diameter of the inorganic pigment is preferably 100 nm or less.
- the average particle size of the primary particles of the inorganic pigment dispersed in the form of primary particles is 100 nm or less. Is more preferably 4 to 50 nm, and most preferably 4 to 20 nm.
- the most preferably used silica synthesized by a gas phase method having an average primary particle size of 4 to 20 nm is, for example, AEROSIL manufactured by Nippon AEROSIL Co., Ltd. is commercially available.
- the vapor-phase-process fine-particle silica can be relatively easily dispersed into primary particles by suction-dispersing in water using, for example, a jet stream inductor mixer manufactured by Mitamura Riken Kogyo KK.
- hydrophilic binder examples include polyvinyl alcohol, gelatin, polyethylene oxide, polyvinyl pyrrolidone, polyacrylic acid, polyacrylamide, polyurethane, dextran, dextrin, carrageenan (eg,, ⁇ , etc.), agar, pullulan, and water-soluble.
- Polyvinyl butyral hydroxyethyl cellulose, carboxymethyl cellulose, and the like. Two or more of these water-soluble resins can be used in combination.
- the water-soluble resin preferably used in the present invention is polyvinyl alcohol.
- the polyvinyl alcohol preferably used in the present invention include, in addition to ordinary polyvinyl alcohol obtained by hydrolyzing polyvinyl acetate, anion-modified polypinyl having a cation-modified polypinyl alcohol terminal anionic group. Modified polyvinyl alcohol such as alcohol is also included.
- the polyvinyl alcohol obtained by hydrolyzing vinyl acetate those having an average degree of polymerization of 100 or more are preferably used, and particularly those having an average degree of polymerization of 150 to 500 are preferably used.
- the saponification degree is preferably from 70 to 100%, particularly preferably from 80 to 99.5%.
- the cation-modified polyvinyl alcohol include, for example, primary to tertiary amino groups and quaternary ammonium groups as described in JP-A-61-10483, and the main chain of the polyvinyl alcohol.
- it is a polyvinyl alcohol in a side chain, which is obtained by genifying a copolymer of an ethylenically unsaturated monomer having a cationic group and vinyl acetate.
- Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl mono (2-acrylamido-2,2-dimethylethyl) ammonium chloride and trimethyl mono (3-acrylamido-3,3-dimethylpropyl) ammonium.
- the ratio of the cation-modified group-containing monomer in the cation-modified polyvinyl alcohol is from 0.1 to 10 mol%, preferably from 0.2 to 5 mol%, based on vinyl acetate.
- Anion-modified polyvinyl alcohol is, for example, a polyvinyl alcohol having an anionic group as described in Japanese Patent Application Laid-Open No. 120680/88, and Japanese Patent Application Laid-Open No. Sho 61-237768. And copolymers of vinyl alcohol and a vinyl compound having a water-soluble group as disclosed in JP-A-63-3799799. Modified polyvinyl alcohol having a water-soluble group as described in the official gazette is exemplified.
- nonion-modified polyvinyl alcohol examples include, for example,-.
- Polypinyl obtained by adding a polyalkylene oxide group to a part of vinyl alcohol as described in JP-A-7-97558.
- Alcohol derivatives, block copolymers of a vinyl compound having a hydrophobic group and vinyl alcohol described in JP-A-8-25795, and the like can be mentioned.
- Polyvinyl alcohol may be used in combination of two or more kinds, such as different degrees of polymerization and types of modification.
- the amount of the inorganic pigment used in the ink absorbing layer depends on the required ink absorbing capacity, The porosity of the porous layer, the kind of the inorganic pigment depends largely on the type of the water-soluble resin, generally the recording sheet lm 2, per, 5 to 3 0 g, preferably from 1 0 to 2 5 g
- the mass ratio of the inorganic pigment to the water-soluble resin used in the ink absorbing layer is usually 2: 1 to 20: 1, preferably 3: 1 to L0: 1.
- the ink absorbing layer may contain a cationic water-soluble polymer having a quaternary ammonium base in the molecule, and is usually 0.1 to 10 g, preferably 0.2 to 5 per lm2 of the ink jet recording medium. Used in the range of g.
- the total amount of the void is preferably a recording sheet lm 2 per 2 0 ml or more.
- the void volume is less than 20 m 1 / m 2 , and when the ink amount during printing is small, the ink absorption is good, but when the ink amount is large, the ink is not completely absorbed and the image quality deteriorates Problems such as drying and delay in drying.
- the void volume with respect to the solid content volume is called a void ratio.
- an ink solvent absorbing layer As another type of void type, besides forming an ink solvent absorbing layer using an inorganic pigment, a polyurethane resin emulsion and a water-soluble epoxy compound and / or acetoacetylated polyvinyl alcohol are used in combination, and epichlorohydrin is further used.
- the ink solvent absorbing layer may be formed using a coating liquid in which a polyamide resin is used in combination.
- the polyurethane resin emulsion is preferably a polyurethane resin emulsion having a polycarbonate chain, a polycarbonate chain, and a polyester chain and having a particle diameter of 3.0 nm, and the polyurethane resin emulsion of the polyurethane resin emulsion is a polycarbonate resin emulsion.
- a polyurethane resin obtained by reacting a polyol having a polycarbonate carbonate and a polyester polyol with an aliphatic isocyanate compound has a sulfonic acid group in the molecule, and further comprises an epichlorohydrin polyamide resin and a water-soluble epoxy compound and / or It is even more preferred to have acetoacetylated vinyl alcohol.
- the ink solvent absorbing layer using the above polyurethane resin is weak in cations and anions. It is presumed that an agglomeration is formed, and accordingly, a void having an ink solvent absorbing ability is formed, so that an image can be formed.
- thermoplastic resin-containing layer (Thermoplastic resin-containing layer)
- a layer containing a thermoplastic resin can be provided on the surface layer of the ink absorbing layer.
- the layer containing the thermoplastic resin may be a layer composed of only the thermoplastic resin or a layer to which a water-soluble binder or the like is added as necessary. Strong S preferred.
- the inorganic pigment that can be added to the thermoplastic resin those described in the description of the ink absorbing layer can be used.
- the thermoplastic resin is preferably a fine particle force S from the viewpoint of ink permeability.
- thermoplastic resin or fine particles thereof examples include polycarbonate, polyacrylonitrile, polystyrene, polyacrylic acid, polyacrylic acid, acrylic ester copolymer, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, and polyester. , Polyamides, polyethers, copolymers thereof, and salts thereof.
- styrene-acrylic acid ester copolymer methacrylic acid ester-acrylic acid ester copolymer, vinyl chloride-vinyl acetate copolymer A copolymer, an acrylic ester copolymer, a vinyl chloride-acrylate copolymer, an ethylene monoacetate copolymer, an ethylene monoacrylate copolymer, and SBR latex are preferred. More preferred thermoplastic resins are acrylyl ester copolymers.
- thermoplastic resin or its fine particles may be used by mixing a plurality of polymers having different monomer compositions, particle diameters, and degrees of polymerization.
- thermoplastic resin or its fine particles consideration should be given to ink receptivity, glossiness of the image after fixing by heating and pressing, image fastness and release properties.
- ink receptivity the particle size of the thermoplastic fine particles was 0. If it is less than 0.5 zm, separation of the pigment particles from the pigment ink in the pigment ink and the ink solvent will be slow, and the ink absorption speed will be reduced. On the other hand, if it exceeds 10 m, the adhesiveness to the solvent absorbing layer adjacent to the ink absorbing layer when coating on the support, the coating strength of the ink jet recording medium after coating and drying, the appearance of gloss, etc. It is not preferable from a viewpoint.
- the fine particle diameter of the thermoplastic resin is preferably from 0.05 to 10, more preferably from 0.1 to 5 lim, and still more preferably from 0.1 to lxm.
- a glass transition point (T g) can be mentioned. If the Tg is lower than the coating and drying temperature, for example, the coating and drying temperature during the production of the recording medium is already higher than the Tg, and voids due to the thermoplastic fine particles through which the ink solvent permeates disappear.
- the preferred Tg of the thermoplastic fine particles is 50 to 150 ° C.
- the minimum film forming temperature (MFT) is preferably 50 to 150 ° C.
- the fine particles of the thermoplastic resin those dispersed in an aqueous system are preferable from the viewpoint of environmental suitability, and an aqueous latex obtained by emulsion polymerization is particularly preferable.
- a type obtained by emulsion polymerization using a nonionic dispersant as an emulsifier can be preferably used.
- the fine particles of the thermoplastic resin preferably have less residual monomer component from the viewpoint of odor and safety, and preferably 3% or less, more preferably 1% or less based on the solid content of the polymer. And particularly preferably 0.1% or less.
- the amount of the remaining polymerization initiator is preferably small, and is preferably 0.5% or less with respect to the solid content of the polymer, but is most preferably not remaining.
- polyvinyl alcohol or polyvinylpyrrolidone can be used in the range of 1 to 10% of the fine particles of the thermoplastic resin.
- the recording medium has an ink absorbing layer on a support, and the surface layer contains at least an inorganic pigment and fine particles of a thermoplastic resin.
- the following points can be cited as preferable reasons.
- the solid content mass ratio of the fine particles of the thermoplastic resin of the surface layer and the inorganic pigment It is preferable to individually determine according to the fine particles of the thermoplastic resin, the inorganic pigment and other additives, etc., and there is no particular limitation, but the fine particles / inorganic pigment of the thermoplastic resin is preferably 2 Z8 to 8/2, and more preferably. 3 7-7 / 3, 4 / 6-6 Z4 is more preferred.
- the support examples include supports conventionally used for ink jet recording media, for example, paper supports such as plain paper, art paper, coated paper and cast-coated paper, plastic supports, and papers coated on both sides with polyolefin.
- paper supports such as plain paper, art paper, coated paper and cast-coated paper
- plastic supports and papers coated on both sides with polyolefin.
- a support and a composite support in which these are adhered can be used.
- the support Prior to coating the ink absorbing layer, the support is preferably subjected to a corona discharge treatment, an undercoating treatment, or the like, for the purpose of increasing the adhesive strength between the support and the ink absorbing layer.
- the recording medium does not necessarily need to be colorless, and may be colored. It is particularly preferable to use a paper support in which both sides of the base paper support are laminated with polyethylene, since the recorded image is close to the photographic quality and a high quality image can be obtained at low cost.
- the base paper used for the paper support is made of wood pulp as a main raw material, and if necessary, is made of synthetic pulp such as polypropylene or synthetic fiber such as nylon or polyester in addition to wood pulp.
- synthetic pulp such as polypropylene or synthetic fiber such as nylon or polyester in addition to wood pulp.
- wood pulp for example, any of LBKP, LBSP, NBKP, NBSP, LDP, NDP, LUKP, and NUKP can be used, but LBKP, NBSP, LBSP, NDP, and LDP, which contain a large amount of short fibers, are more suitable It is preferable to use many.
- the ratio of LBSP or LDP is preferably 10 to 70% by mass.
- pulp chemical pulp (sulfate pulp or sulfite pulp) having a small amount of impurities is preferably used, and pulp having improved whiteness by a bleaching treatment is also useful.
- base paper for example, sizing agents such as higher fatty acids, alkyl ketene dimer, etc., white pigments such as calcium carbonate, talc, and titanium oxide, paper strength agents such as starch, polyacrylamide, and polyvinyl alcohol, and fluorescence enhancement Whitening agent, polyethylene glycol A water-retaining agent such as water, a dispersant, a softening agent such as quaternary ammonium, and the like can be appropriately added.
- sizing agents such as higher fatty acids, alkyl ketene dimer, etc.
- white pigments such as calcium carbonate, talc, and titanium oxide
- paper strength agents such as starch, polyacrylamide, and polyvinyl alcohol
- fluorescence enhancement Whitening agent polyethylene glycol
- a water-retaining agent such as water, a dispersant, a softening agent such as quaternary ammonium, and the like can be appropriately added.
- the freeness of pulp used for papermaking is preferably 200 to 500 ml according to the CSF standard, and the fiber length after beating is defined as JIS-P-8207.
- the sum with the mass% of the minute is preferably 30 to 70%.
- the mass% of the remaining 4 mesh is 20 mass% or less.
- the basis weight of the base paper is preferably 30 to 250 g, particularly preferably 50 to 200 g.
- the thickness of the base paper is preferably 40 to 250 m.
- the base paper may be calendered at the papermaking stage or after papermaking to provide high smoothness.
- the density of the base paper 0. 7 ⁇ 1. 2 g / m 2 (JI SP-81 18) are common.
- the stiffness of the base paper is preferably 20 to 200 g under the conditions specified in JIS-P-8143.
- a surface sizing agent may be applied to the surface of the base paper.
- a sizing agent such as a higher fatty acid and an alkyl ketene dimer that can be added to the base paper can be used.
- the base paper preferably has a pH of 5 to 9 as measured by the hot water extraction method specified in JIS-P-8113.
- the polyethylene that covers the front and back sides of the base paper is mainly low-density polyethylene (LDPE) and / or high-density polyethylene (HDPE), but other LL DPE and polypropylene can also be used partially.
- LDPE low-density polyethylene
- HDPE high-density polyethylene
- the polyethylene layer on the side of the ink absorption layer is preferably one in which rutile or anatase type titanium oxide is added to polyethylene to improve opacity and whiteness, as is widely used in photographic printing paper.
- the content of titanium oxide is usually from 3 to 20% by mass, preferably from 4 to 13% by mass, based on polyethylene.
- Polyethylene-coated paper can be used as glossy paper, and when polyethylene is melt-extruded onto the base paper surface, a so-called molding process is applied to form a matte surface or silk surface that can be obtained with ordinary photographic paper. Those that have been used can also be used in the present invention.
- the amount of polyethylene used on the front and back of the base paper should be low and high after the void layer and back layer are provided. It is selected so as to optimize the curl under wet conditions.
- the polyethylene layer on the side of the void layer is in the range of 20 40 ⁇ , and the back layer side is in the range of 130 m.
- the coating solution was heated at 40 ° C and applied.After cooling, the coating solution was cooled for 20 seconds in a cooling zone maintained at 0 ° C, and then blown at 25 ° C (relative humidity 15%). 60 seconds in a 45 ° C wind (25% relative humidity) for 60 seconds, and 60 seconds in a 50 ° C wind (25% relative humidity) for 20 seconds, The sample was wound up after adjusting the humidity for 2 minutes in an atmosphere with a humidity of 4060 ° C. The application was performed such that the lower layer had an amount of silica of 18 gZm 2 and the surface layer had an amount of silica of 3 g / m 2 .
- UV ITE NFW LI QUI ID manufactured by Ciba Specialty Chemicals
- UV ITE NFW LI QUI ID which is a water-soluble fluorescent whitening agent
- thermoplastic fine particles (acrylic latex, Tg 82 ° C, number average particle diameter 160 nm, solid content 25%) were mixed with the thermoplastic fine particles.
- the surface layer coating solution 1 was prepared by adding over 15 minutes so that the solid content ratio of the silica / filament (silica) became 55Z45, filtered through a 10 m filter, and used for coating.
- the recording ink may be a dye or a pigment as long as it is suitable for an ink jet system.
- a pigment ink is preferable when emphasis is placed on image storability and image quality.
- organic pigments such as insoluble pigments and lake pigments, and carbon black can be preferably used.
- the insoluble pigment include, but are not limited to, azo, azomethine, methine, diphenylmethane, triphenylmethane, quinacridone, anthraquinone, perylene, indigo, quinophthalone, isoindolinone, isoindoline, azine, oxazine, Thiazine, dioxazine, thiazole, phthalocyanine, diketopyrrolopyrrole and the like are preferred.
- Specific pigments that can be used include the following pigments.
- pigments for magenta or red examples include CI Pigment Red 2, CI Pigment Red 3, CI Pigment Red 5, CI Pigment Red 6, CI Pigment Red 7, C Pigment Red 15, CI Pigment Red 16, CI Pigment Red 48: 1, C.I. Pigment Red 53: 1, C.I. Pigment Red 57: 1, C.I. Pigment Red 122, C. I. Pigment Red 123, C. I. Pigment Red 139, C. I. Pigment Red 144, C. I. Pigment Red 1 49, C. I. Pigment Red 166, C. I. Pigment Red 177 Pigment Red 178, CI Pigment Red 222 and the like.
- Pigments for orange or yellow include, for example, C.I. Pigment Orange 31, C.I. Pigment Orange 43, C.I. Pigment Yellow 12, C.I. Pigment Yellow 13, C.I. Yellow 14, CI Pigment Yellow 15, CI Pigment Yellow 17, CI Pigment Yellow 93, CI Pigment Yellow 94, CI Yellow Yellow 138 and the like.
- green or cyan pigments examples include CI Pigment Blue 15, CI Pigment Blue 15: 2, CI Pigment Blue 15: 3, CI Pigment Blue 16, CI Pigment Blue 60, CI Pigment Green 7 and the like.
- pigments may use a pigment dispersant as needed.
- pigment dispersants examples include higher fatty acid salts, alkyl sulfates, alkyl ester sulfates, alkyl sulfonates, sulfosuccinates, and the like.
- the method for dispersing the pigment is not particularly limited.
- a pole mill, a sand mill, an attritor, a roll mill, agitate, a Henschel mixer, a colloid mill, an ultrasonic homogenizer, a pearl mill, a wet jet mill, a paint shell One car or the like can be used.
- a centrifugal separator or a filter For the purpose of removing the coarse particles of the pigment dispersion according to the present invention, it is also preferable to use a centrifugal separator or a filter.
- the average particle size of the pigment in the pigment ink is selected in consideration of the stability in the ink, the image density, the glossiness, the light fastness, etc.
- the glossiness and the texture are improved. It is preferable to select the particle size also from the viewpoint of.
- the selection of the particle size improves the gloss and the texture, but it is related to the fact that the pigment in the image is in a state where the fine particles of the thermoplastic resin are dispersed in the molten film. I guess. For high-speed processing, the thermoplastic resin fine particles must be melted in a short time and the pigment must be sufficiently dispersed in the film. At this time, the surface area of the pigment has a great effect, and it is estimated that there is an optimum region for the average particle size.
- the water-based ink composition which is a preferred form of the pigment ink, is preferably used in combination with a water-soluble organic solvent.
- water-soluble organic solvent examples include alcohols (for example, methanol, ethanol, propanol, isopropanol, butanol, isopanol, secondary oil, tertiary oil, pentanol, hexanol, cyclohexyl).
- alcohols for example, methanol, ethanol, propanol, isopropanol, butanol, isopanol, secondary oil, tertiary oil, pentanol, hexanol, cyclohexyl).
- polyhydric alcohols for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, butylene glycol, hexanediol, pentanediol, glycerin) , Hexanetriol, thiodiglycol, etc.
- polyhydric alcohol Ters for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monomethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monobutyl ether, ethylene Glycol monomethyl ether—teracetate, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, ethylene glycol monobutyl ether, ethylene glycol monomethyl
- the water-soluble organic solvents may be used alone or in combination.
- the total amount of the water-soluble organic solvent added to the ink is 5 to 60% by mass, preferably 10 to 35% by mass.
- Ink compositions include thermoplastic resin microparticles and viscosity modifiers, depending on the purpose of improving ejection stability, print head cartridge compatibility, storage stability, image storability, and other properties. , Surface tension adjuster, resistivity adjuster, film forming agent, dispersant, surfactant, ultraviolet absorber, antioxidant, anti-fading agent, sunscreen agent, antioxidant, etc. It can be added as appropriate.
- thermoplastic resin since the glossiness of an image is improved.
- the fine particles of the thermoplastic resin the types described in the description of the thermoplastic resin or the fine particles that can be added to the surface layer of the recording medium P can be used.
- an ink that does not cause thickening or precipitation even when added to a recording ink it is preferable to use an ink that does not cause thickening or precipitation even when added to a recording ink.
- the average particle size of the fine particles of the thermoplastic resin is preferably 0.5 xm or less, more preferably from 0.2 to 2 times the average particle size of the pigment in the recording ink from the viewpoint of stability. preferable.
- the fine particles of the thermoplastic resin to be added are preferably those that melt and soften in the range of 50 to 200 ° C.
- the viscosity of the ink composition during flight is preferably 4 OmPas or less, more preferably 3 OmPas or less.
- the surface tension during flight is preferably 2 OmN Zm or more, more preferably 30 to 45 mNZm.
- the pigment solids concentration in the recording ink can be selected in the range of 0.1 to 10% by mass.
- a so-called light and shade ink in which the pigment solids concentration is changed.
- Yellow, magenta, cyan and black shades respectively are particularly preferred.
- special color inks such as red, green, and blue as needed from the viewpoint of color reproducibility.
- a horizontal bead mill prepared by mixing each of the above additives and filling with 0.3% zirconia beads at 60% by volume (Ashiza Co., Ltd. The mixture was dispersed by using the above method to obtain a magenta pigment dispersion.
- the average particle size of the obtained magenta pigment was 105 nm.
- Carbon black 20% by mass styrene-acrylic acid copolymer (molecular weight 7,000, acid value 150)
- Surfactant Sudfinol 465 manufactured by Nissin Chemical Industry Co., Ltd.
- Each of the above compositions was mixed, stirred, and filtered to prepare a yellow ink, which is an aqueous pigment ink of the present invention.
- the average particle size of the pigment in the ink was 12 O nm, and the surface tension was 36 mNZm.
- a magenta ink which is an aqueous pigment ink of the present invention.
- the average particle size of the pigment in the ink was 113 nm, and the surface tension was 35 mNZm.
- the mixture is stirred, filtered through a 1 m filter, and the aqueous pigment of the present invention is mixed.
- a magenta light ink was prepared as an ink.
- the average particle size of the pigment in the ink was 1 O nm, and the surface tension was 37 mN / m.
- a cyan ink which is an aqueous pigment ink of the present invention.
- the average particle size of the pigment in the ink was 95 nm, and the surface tension ⁇ was 36 mNZm.
- Each composition was mixed, stirred, and filtered through a 1 m filter to prepare a light cyan ink which was an aqueous pigment ink of the present invention.
- the average particle size of the pigment in the ink was 92 nm, and the surface tension was 3 SmNZm.
- Surfactant (Surfynol 465, manufactured by Nissin Chemical Industry Co., Ltd.) 0.1% by mass of ion-exchanged water 59.9% by mass or more of each composition is mixed, stirred, and filtered through a 1 ⁇ m filter.
- a black pigmented ink was prepared as an aqueous pigment ink.
- the average particle size of the pigment in the ink was 85 nm, and the surface tension was 35 mN / m. ⁇ Preparation of black light ink>
- a black light ink which is an aqueous pigment ink of the present invention.
- the average particle size of the pigment in the ink was 89 nm, and the surface tension was 36 mN / m.
- a colorless ink is an ink that does not substantially contain a coloring material, and it is preferable that the change in ⁇ ⁇ in the image area depending on the presence or absence of the colorless ink is 3 or less.
- the components of the colorless ink can be either homogeneously dissolved or present in a heterogeneous dispersion.
- a colorless ink obtained by removing only the coloring material from the recording ink to be used can be used, it is preferable to add the following.
- Examples of the additives that can be added include a resin in a dissolved state in an aqueous system, a resin in a dispersed state in an aqueous system, a resin in a dissolved state in an organic solvent system, and a resin in a dispersed state in an organic solvent system.
- the resin and the resin dispersed in an aqueous system are preferable.
- aqueous resin in a dissolved state examples include polyvinyl alcohol, gelatin, polyethylene oxide, polyvinyl pyrrolidone, polyacrylic acid, polyacrylamide, polyurethane dextran, dextrin, and carrageenan ( ⁇ , ⁇ , ⁇ , etc.). ), Agar, pullulan, water-soluble polypinyl butyral, hydroxyethyl cellulose, carboxymethyl cellulose and the like.
- thermoplastic resin As the resin dispersed in an aqueous system, a thermoplastic resin is preferable.
- a thermoplastic resin for example, polycarbonate, polyacrylonitrile, polystyrene, polyacrylic acid, polymethacrylic acid, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyester, polyamide, polyether, copolymers thereof, and salts thereof, and the like.
- thermoplastic resin or its fine particles may be used by mixing a plurality of polymers having different monomer compositions, particle diameters and degrees of polymerization. .
- the recording ink and the colorless ink are mixed, it is desirable that substantially no aggregation of the coloring material occurs, and specifically, the change in the absorbance of the recording ink is less than 5%.
- the colorless ink and the recording ink are supplied from the ink jet nozzle, it is not preferable, but the ink may be contaminated by both inks.
- the same recording head 22 is used as the recording ink for each image forming mode. Or colorless ink. Even in such cases, the image quality and gloss should not be reduced.When this point was examined, when the recording ink and the colorless ink were mixed, the change in the absorbance was 5% of the absorbance immediately after.
- the ratio was less than 1, the image quality and the gloss did not decrease. More specifically, 10 ml of the colorless ink was added to 40 ml of the recording ink, and the absorbance of the supernatant immediately after mixing was measured. Next, the mixture was sealed and stored in an environment at 25 ° C. for 3 days, and the absorbance of the supernatant was measured and compared in the same manner. The absorbance of the ink was measured using a spectrophotometer (U-320, manufactured by Hitachi, Ltd.) at the maximum value of absorbance in the range of 400 nm to 700 nm.
- the rate of change in absorbance was calculated as (absorbance before storage-absorbance after storage) / (absorbance before storage) XI 00 (%).
- the absorbance change of each recording ink described above is 1.0% for yellow deep ink, 1.3% for magenta dark ink, 0.7% for magenta light ink, and 0.2% for cyan dark ink.
- the ratio was 0.5% for light ink, 0.9% for dark black ink, and 1.% for black light ink.
- the colorless ink is ejected using the same recording head 22 as that used for the recording ink.
- eight recording heads 22 are prepared and used for Y, M, C, K, LC, LM, LK, and colorless ink, respectively. It is desirable to discharge .
- the recording ink and the colorless ink may be mixed on the recording medium P before the medium is absorbed, so that the degree of freedom in prescribing the recording ink and the colorless ink is reduced.
- a recording ink discharge part and a colorless ink discharge part may be separately provided, and after one of the discharges is completed, the other may be discharged.
- FIG. 8 shows half! 3 is a flowchart showing an outline of the processing of a single module 206.
- the printer driver 203 determines each pixel with the origin at the upper left corner of one image based on the image data input from the application program 201. Scan in order. First, from the color gradation correction module 205, the gradation data after color correction for each pixel in the scanning direction of the carriage 23 DS (Y, M, C, K, LM, LC 'LK , 8 bits each) (Step S100).
- the printer driver 203 performs a process of determining the recording dot on / off based on the gradation data DS (step S110), and creates gradation data DS of the next pixel (S110). 120). This is repeated for all the pixels in the predetermined area (S130). 3X After performing the process for a predetermined area, the total amount of recording ink applied to the area is determined (S140), and the amount of colorless ink to be applied to the area is determined based on this value (S140). 150). Specifically, the amount of the colorless ink adhered is determined so that the total amount of the adhered amounts of the recording ink and the colorless ink is equal to or more than a predetermined amount.
- the colorless ink is ejected in the area (S160), and the above processing is repeated for all the predetermined areas on the recording surface of the recording medium P (S170).
- the colorless ink is ejected even in the white portion where the recording ink is not ejected.
- gloss can be obtained even in a white portion.
- the predetermined area is a unit area on the recording medium in which the total amount of the adhesion between the colorless ink and the recording ink should be kept at a certain level or more.
- the minimum is one pixel unit, and the maximum is the entire area of the recording medium.
- the effect is weak in terms of the entire surface in order to impart gloss uniformity.
- the control of the amount of colorless ink applied is the finest, but even if the amount of print ink applied to one pixel is zero, the ink absorption of the print medium in all surrounding pixels If a recording ink near the capacity limit is struck, it is more advantageous for the pixel not to be struck with a colorless ink to prevent the ink from overflowing. Therefore, there is a desirable size for this unit area.
- the maximum control unit is 2 units. It was found that the size was indispensable to be less than mm, more preferably 0.5 mm square unit. Regarding the resolution of the human eye, when the distance between the eye and the recording medium is about 30 cm, the sensitivity is highest at 0.5 mm intervals. Therefore, when ensuring uniformity of black density on the recording surface by the dots of the recording head, the dots need to be distributed at a higher spatial frequency.
- the unit area is 1 mm square and the total amount of the colorless ink and the recording ink adhered within the unit area is a predetermined amount or more. As described above, when the unit area is 1 mm square, it is desired that the total amount of the colorless ink and the recording ink adhered is 2 cc / m 2 or more.
- a block consisting of a set of n pixels may be used as a unit area.
- the number of gradations per pixel is sufficient. Therefore, halftone processing using error diffusion and dither matrix is required.
- the area of the control unit is a dither matrix unit, colorless ink data can be calculated simultaneously with halftone processing, which is efficient.
- the dither matrix is a technique that does not require much image quality, but is used when high-speed output is desired. The effect of calculating the amount of colorless ink deposited at high speed is great.
- the unit area of the amount of adhesion between the colorless ink and the recording ink is set as a block composed of a set of n pixels (n> l), so that the adhesion between the recording ink and the colorless ink corresponds to the dither matrix.
- the amount can be controlled.
- the same pixel block as that used for error diffusion was used as the unit area to create the colorless ink data. It is not limited to this, and may be combined with half! That is, for example, error diffusion is performed at 1800 dpi per pixel, and after determining the recording ink ejection position, it is divided into 2 x 2 4-pixel blocks to calculate the amount of ink deposited. However, the colorless ink ejection position can be determined.
- dither processing may be used as half-tone processing, and the recording dots in the matrix may be determined at the same time as the dither processing, and then the total amount of ejection inks in the matrix may be determined to be equal to or greater than a predetermined value. Aside from the dither matrix, a block for colorless ink may be created to calculate colorless ink.
- the block as a unit area for calculating colorless ink is limited to the above 2 x 2 Instead, a larger size may be used. In that case, the formation of colorless ink dots can be determined while considering the amount of adhesion in a wider area. For example, as shown in FIGS. 9A and 9B, assuming that the total amount of the adhesion between the colorless ink and the recording ink is 25% as the predetermined adhesion amount, the colorless ink is applied to the four pixel blocks in FIG. 9A. One dot is ejected, but when the recording ink is calculated in the wider area of FIG. 9B, it can be seen that the total amount of adhesion is 50% even before the ejection of the colorless ink.
- a square having the same length and width is used as the pixel block.
- the present invention is not limited to this, and a block shape such as a rectangle and a rhombus can be appropriately selected.
- the image forming apparatus 200 transmits the recording ink data and the colorless ink data to the control circuit of the ink jet printer 1. Output to 100.
- the control circuit 100 controls the transport mode 101, the carriage driving mode 231, the recording head 22 and the like based on the recording ink data and the colorless ink data.
- the recording ink and the colorless ink are ejected from the recording head 22 while the recording medium P is conveyed and the carriage 23 is driven.
- the control circuit 100 controls the heating roller driving motor 4 so that the heating roller 41 transports the recording medium P. 4 while controlling the temperature sensor 4 13
- the heat source 43 is heated so as to reach the heating temperature.
- the image is fixed on the recording medium P.
- the recording ink, the colorless ink, and the thermoplastic resin of the recording medium P are melted and formed into a film, so that the glossiness is improved.
- a method of fixing an image by heating is applied as a fixing process.
- an image may be fixed by pressure as a fixing process.
- the image may be fixed by both.
- the fixing process may be performed continuously after image formation, or may be performed collectively after forming a fixed amount of image.
- a fixing treatment within a certain time range from the viewpoint of developing gloss.
- the fixing treatment is preferably performed within 5 seconds to 10 minutes, and more preferably, within 10 seconds to 5 minutes.
- thermoplastic resin In the above method, it is particularly preferable to heat and fix an image in which an inorganic pigment and a thermoplastic resin are mixed or present in the vicinity thereof, and in this case, the thermoplastic resin is partially or completely melted, It is particularly preferable to form a film.
- energy sufficient to exert the effect of the present invention may be applied. However, if an excessively high energy is applied, deformation of the support occurs, and rather, the luster is deteriorated. Absent.
- the heating temperature may be any temperature at which the image can be smoothed, and is preferably in the range of 60 to 200 ° C, more preferably in the range of 80 to 160 ° C.
- the heating performed in the fixing process may be performed by a heating device built in the ink jet printer 1 such as the fixing unit 4 exemplified in the present embodiment, or may be performed by a separately provided heating device.
- a heating device it is preferable to use a heating roller, a heating belt, or a system in which the heating roller or the heating belt is combined, because it is suitable for performing a continuous process in a small space without generating unevenness.
- these heating devices can be diverted to an electrophotographic heating and fixing machine, which is advantageous in cost.
- a fixing device for fixing an image by performing both heating and pressurizing processes for example, a recording medium is passed between a heating roller having a built-in heating element and a pressure roller, thereby performing heating and pressurizing processes. And a method of applying heat and pressure by sandwiching a recording medium between two heating rollers.
- the conveying speed of the recording medium is preferably in the range of 1 to 15 mmZ seconds. This is preferable not only from the viewpoint of high-speed processing but also from the viewpoint of image quality.
- the pressure to be applied is preferably in the range of 9.8 X 104 to 4.9 X 106 Pa. This is because formation of a film is promoted by pressurization.
- image formation is performed by discharging the recording ink to the recording medium P and discharging the colorless ink for improving the gloss to the recording medium P. Therefore, even if the gloss of the image forming area is improved by the coloring material contained in the recording ink, the colorless ink is ejected to the white background and the highlight part where the amount of the recording ink is small, so that these colors are discharged.
- the gloss of the part can be improved.
- the amount of colorless ink deposited per unit area is determined according to the amount of recording ink deposited per unit area, the gloss of the recording surface of the recording medium can be made uniform, and unevenness due to gloss unevenness can be achieved. Can be improved.
- the present invention is not limited to the first embodiment, but can be changed as appropriate.
- the adhesion amount of the colorless ink per unit area when determining the adhesion amount of the colorless ink per unit area, calculation is performed so that the total amount of the recording ink and the colorless ink per unit area is equal to or larger than a predetermined amount.
- the method is exemplified, in addition to this, the area where the amount of the applied recording ink per unit area is a certain amount or less is more colorless than the area where the applied amount of the recording ink is larger than a certain amount.
- a method of calculating so as to increase the ink ejection amount may be used.
- the image forming apparatus 200 is configured to perform the processing of the colorless ink data and the halftone processing of the recording ink dot processing. Or may be performed individually with different devices.
- the advantage of performing the colorless ink data processing and the recording ink dot processing halftone processing separately is that the halftone processing is processed by the image forming apparatus 200 or a printer driver such as a host personal computer, and the colorless ink calculation is performed by the printer driver. The point is that it can be held inside the ink jet pudding. Halftoning is a time-consuming process, It is common to save the calculated results in a file and use it for repeated output at a later date. Properties such as glossiness may be affected by the surrounding temperature and humidity.
- the ink jet recording method for determining the amount of colorless ink per unit area according to the amount of recording ink per unit area has been described.
- the amount of colorless ink deposited per unit area is determined according to the amount of recording ink deposited per unit area, and the discharge position of non-colored ink is further determined according to the discharge position of recording ink.
- the same portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
- FIG. 10 is a flowchart showing an outline of the processing of the halftone module 206 according to the second embodiment. Referring to FIG. The calculation process of the recording ink data by the module 206 and the calculation process of the colorless ink by the colorless ink calculation module 207 will be described.
- the printer driver 203 sets each pixel with the origin at the upper left corner of one image based on the image data input from the application program 201. Are scanned in order.
- the gradation after color correction for each pixel in the order along the scanning direction of the carriage 23 DS (Y, M, C, K, LM , LC, LK, 8 bits each) (Step S200).
- the printer driver 203 performs a process of determining the recording dot on / off based on the gradation data DS (step S210), and converts the gradation data DS of the next pixel. Create (S220). This is repeated for all the pixels within the unit area (S230). After performing the processing for the unit area, the total adhesion amount of the recording ink in the area is determined (S240), and the adhesion amount of the colorless ink to be applied to the area is determined based on this value (S250). o) Specifically, the adhesion amount of the colorless ink is determined so that the total adhesion amount of the recording ink and the colorless ink is equal to or more than a predetermined amount. Then, based on the determined adhesion amount of the colorless ink, it is calculated how many dots of the colorless ink are adhered in the unit area (S260).
- the printer driver 203 checks the dot position serving as the recording ink discharge position (step S270), and according to the recording ink discharge position and the number of colorless ink dots, the colorless ink is discharged.
- the dot position to be the ejection position is determined (step S280).
- the colorless ink discharge position is determined so that the recording ink discharge position and the colorless ink discharge position are adjacent or non-overlapping within a unit area.
- a 2 ⁇ 2 4-pixel block is used as a unit area.
- darkly filled squares indicate the recording ink ejection position
- lightly shaded squares indicate the colorless ink ejection position
- unfilled squares indicate no ink adhesion. Position.
- the total amount of adhesion between the colorless ink and the recording ink is set to 25%, so if the recording ink is not ejected during the 4-pixel block, as shown in Fig. 11C. Only one dot of colorless ink is ejected to the lower left pixel of the four pixel block, and if the recording ink is ejected during the four pixel block, no colorless ink is ejected during the four pixel block. This prevents the ejection position of the recording ink and the ejection position of the colorless ink from overlapping. For example, when the recording ink is ejected to the ejection position as shown in FIG.
- one dot of the colorless ink is ejected to the four pixel blocks in each of the four pixel blocks where no recording ink is ejected. Is done.
- the ink may be adjacent to the recording ink ejection position of an adjacent 4-pixel block. If the colorless ink discharge positions are adjacent to the top, bottom, left and right of the ink discharge position based on the ink discharge position, the colorless ink discharge position is made different from the lower left so as not to be adjacent to the recording ink discharge position. Determine the discharge position of 1 IB)).
- FIG. 12 illustrates the case where the ejection position of the recording ink is smaller than that of FIG. 11 (see FIG. 12A).
- the recording ink discharge position and the colorless ink discharge position do not overlap and do not adjoin (see FIG. 12B). .
- FIG. 13 illustrates the case where the recording ink ejection positions are arranged in a straight line (see FIG. 13A). In such a linear pattern, since dot bleeding is easily recognized, the colorless ink ejection position is determined so as not to be adjacent to the recording ink as shown in FIG. 13B.
- FIG. 14 illustrates the case where the total amount of adhesion between the colorless ink and the recording ink is 50%. If the recording ink is not ejected during the 4-pixel block, as shown in Fig. 14C, one dot of the colorless ink is ejected to two diagonally arranged pixels of the 4-pixel block.
- FIG. 14C illustrates two types of arrangement patterns.
- the recording ink When the recording ink is ejected in the four-pixel block, one dot of the colorless ink is ejected to one pixel positioned on the diagonal line. Then, for example, when the recording ink is ejected to the ejection position shown in FIG. 14A, the colorless ink is ejected to the ejection position shown in FIG. 14B. Then, as shown in FIG. 10, the above processing is repeated for all predetermined areas on the recording surface of the recording medium P (3290). As described above, in order to determine the ejection position of the colorless ink for all the predetermined areas on the recording surface of the recording medium P, the colorless ink is ejected even in the white portion where the recording ink is not ejected. That is, gloss can be obtained even in the white portion.
- the error diffusion method is used as halftone processing, and the amount of colorless ink is calculated.
- the total amount of the colorless ink was set to a predetermined amount or more.
- the recording conditions are as follows. Recording resolution: Main scan / Sub scan 1080 dpi
- Ink type Light and cyan, light and dark magenta, light and dark black, yellow, colorless ink
- Ink system control (block unit area area product): 4 pixels, 2 pixels vertically and horizontally
- gray 33-tone patches (data values 0, 8, 16, 24,- ⁇ , 248, 255) are converted to C, M, Y, K, LM, LC, and LK recording inks. An image was formed as a mixture (so-called composite black).
- the patches are pre-graded from 0 (no ink) to 255 (darkest patch) so that the brightness (L * value) is even, and the a * and b * values are almost equal.
- the amount of each recording ink was balanced so as to be zero.
- the patch size was 4 cm square so that the gloss and C value could be measured.
- Figure 16 shows a graph in which the amount of ink of the patch at each gradation level is plotted for each ink.
- The% value on the vertical axis is the ratio of the amount of ink adhering to the medium, and 100% is defined as the case where one of the ink droplets hits all the pixels. In this case, 6. 7 p 1 becomes the pixel surface the product 23. 5 X 23. 5, deposition amount is 12. 1 cc / m 2.
- the colorless ink is ejected from the recording head 22 for the colorless ink to form the colorless ink dots on the recording surface of the recording medium. I made it.
- the total amount of colorless and recording ink was varied from 12.5-100%. As shown in Figure 17 ⁇ , when the total amount is 25%, colorless ink is ejected to the upper left pixel when there is no recording ink in the 4-pixel block. If any recording ink is hit on the block, no colorless ink is applied. That is, only blocks for which the gradation level is calculated to be 0 are applied with colorless ink. The amount of adhesion at this time is 3. O c cZm 2 .
- colorless ink dots are ejected so that at least two dots of recording ink and colorless ink are hit on each block. If two drops of recording ink have been ejected, no colorless ink dots are formed.
- the gradation level is calculated to be 0
- colorless ink dots are formed in the upper left and lower right pixels, respectively.
- colorless ink dots are formed at pixel positions that are diagonal to the recording ink. Deposition amount at this time becomes 6. lc cZm 2.
- Fig. 17C discharge the colorless ink dots so that the recording ink and the colorless ink are at least three drops in total in the block. If three drops of recording ink have been ejected, no colorless ink dots are formed. At this time, the attached amount is 9. lc cZm 2 .
- a recording ink or a colorless ink dot must be formed for every pixel. That is, if the recording ink is ejected to each pixel, no colorless ink is ejected.
- 5% is created by forming at least one drop of recording ink or colorless ink in two blocks, that is, in units of 8 pixels, and forming the image forming surface according to JIS-Z-8741.
- the degree of specular gloss was measured.
- a variable-angle gloss system (VGS-1001DP) manufactured by Nippon Denshoku Industries Co., Ltd. was used for the measurement.
- Figure 18 shows the measured gloss values for the 25-100% patch.
- the total amount of adhesion between the recording ink and the colorless ink is always 100% or more, it is not necessary to make blocks for calculating the colorless ink, and the colorless ink is always applied to the pixels without the recording ink. it can. According to this method, the calculation of the colorless ink is simplified, so that the calculation time can be reduced and the equipment can be simplified.
- the error diffusion method is used for both the halftone processing and the calculation of the amount of colorless ink.
- the recording inks are four colors of dark color only, and the recording conditions are as follows.
- the colorless ink calculation in this case is calculated from the image data before the halftone processing of the recording ink.
- CMYK data 8-bit value
- that value becomes the total amount of the recording ink.
- the data for the colorless ink is a (0-255)
- the total amount of the colorless ink and the recording ink is b
- the amounts of the recording inks are Y, M, C, and K
- a 255 X It can be calculated by the formula (b / 100)-(Y + M + C + K).
- the colorless ink data is set to a maximum of 128 and perform normal halftone processing. As a result, colorless ink dots are formed on 50% of the recording medium.
- the colorless ink is reduced by the amount of the recording ink, and as a result, the sum of the recording ink and the colorless ink becomes 50% or more in the entire recording area.
- the total amount b of the recording ink and the colorless ink can be set arbitrarily. If b> 255, colorless ink is applied to the same pixel position more than once.
- the halftone process and the colorless ink calculation can be processed by the same algorithm, so that there is no need to prepare a separate algorithm for the colorless ink.
- it is effective to implement all processing in the printer because it can reduce equipment costs.
- FIG. 19 shows a graph in which the ink amounts of the patches of each gradation level are plotted.
- FIG. 20 shows a graph of the 60-degree gloss value when the colorless ink is changed from 25 to 100%.
- the amount of colorless ink is 50% (6 cc / m 2 ) or more, the effect of improving the gloss with respect to the amount of adhesion is small.
- the density was increased to 13 cc / m 2 or more, a decrease in the line width was observed with a colorless ink, such as in a pattern having thin blue or black lines on a white background. That is, flashing and economic aspects, the influence on the image quality, the amount of biasing Chakuryou within a unit area has an appropriate value, 1 less than 3 cc / m 2 2 cc / m 2 or more at the optimum / This.
- the appropriate size of the colorless ink calculation block was examined.
- the total amount of adhesion of the colorless ink and the recording ink was set to 25% and 50% or more, and visual evaluation was performed by changing the block size as shown in FIGS. 21A and 21B.
- 2 MX 2 M pixels are used as a block, and at a setting of 25%, colorless ink is formed in all the pixels in the upper left block as shown in FIG. 21A.
- At 50% setting colorless ink is applied to all pixels in the lower left block as shown in Figure 21B.
- the length of this block is 2 MX 23. 1 pixel is 1080 dpi.
- a patch was created that changed this from 0.09 mm (4 pixel blocks) to 4.7 mm (200 pixel blocks). In this case, no recording ink was applied, and only colorless ink was applied to the medium.
- Table 1 shows the evaluation results. ⁇ table 1 ⁇
- the size of the block for controlling the colorless ink is appropriately set to be equal to or less than lmm.
- the unevenness of gloss is slightly recognized, but on the contrary, a texture such as so-called silky gloss appears, so that it can be suitably used depending on the user's preference.
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- Engineering & Computer Science (AREA)
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- Wood Science & Technology (AREA)
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- Ink Jet Recording Methods And Recording Media Thereof (AREA)
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Abstract
Description
Claims
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US10/544,264 US20060284929A1 (en) | 2003-02-04 | 2004-01-21 | Inkjet recording method and inkjet printer |
JP2005504793A JPWO2004069543A1 (ja) | 2003-02-04 | 2004-01-21 | インクジェット記録方法及びインクジェットプリンタ |
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US9908343B2 (en) | 2012-12-15 | 2018-03-06 | Hewlett-Packard Development Company, L.P. | Control of printing systems to apply treatment |
US10661580B2 (en) | 2012-12-15 | 2020-05-26 | Hewlett-Packard Development Company, L.P. | Control of printing systems to apply treatment |
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