Ink jet recording method, ultraviolet curable ink, and ink jet recording apparatus
Provided is an ink jet recording method including: discharging first ultraviolet curable ink of a radical polymerization reaction type which contains a radical photopolymerization initiator and a radical polymerization compound and in which transmittance at a wavelength of 395 nm is equal to or less than 1%, onto a recording medium; and curing the first ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light, in which a light source which initially emits the ultraviolet light in the curing of the ink is an ultraviolet light emitting diode in which peak intensity of the irradiated ultraviolet light is equal to or more than 800 mW/cm 2 .
1. An ink jet recording method comprising:
discharging a first ultraviolet curable ink of a radical polymerization reaction type which contains a radical photopolymerization initiator and a radical polymerization compound and in which transmittance at a wavelength of 395 nm is equal to or less than 1%, onto a recording medium; and
curing the first ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light,
discharging a second ultraviolet curable ink of a radical polymerization reaction type which contains a radical photopolymerization initiator and a radical polymerization compound and in which transmittance at a wavelength of 395 nm exceeds 1%, onto a recording medium; and
curing the second ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light,
wherein a light source which initially emits the ultraviolet light in the curing of the first ultraviolet curable ink is an ultraviolet light emitting diode in which peak intensity of the irradiated ultraviolet light is in a range of 800 mW/cm 2 to 2000 mW/cm 2 ,
wherein a light source which initially emits ultraviolet light in the curing of the second ultraviolet curable ink is an ultraviolet light emitting diode in which peak intensity of the irradiated ultraviolet light is less than 800 mW/cm 2 .
2. The ink jet recording method according to claim 1 ,
wherein an irradiation energy of the ultraviolet light emitted from the ultraviolet light emitting diode which initially emits ultraviolet light is 100 mJ/cm 2 to 600 mJ/cm 2 .
3. The ink jet recording method according to claim 1 , further comprising
further emitting ultraviolet light, after emitting ultraviolet light from the ultraviolet light emitting diode which is a light source which initially emits the ultraviolet light.
4. The ink jet recording method according to claim 1 ,
wherein the irradiation from the ultraviolet light emitting diode which initially emits the ultraviolet light is at least any of pulse irradiation and spot irradiation by a condensing lens.
5. The ink jet recording method according to claim 1 , further comprising
recording using a line type ink jet recording apparatus including discharging the first ultraviolet curable ink onto the recording medium, while relatively moving positions of a head including nozzle arrays having a length greater than a length corresponding to a width of the recording medium and the recording medium in a scanning direction intersecting the width direction.
6. The ink jet recording method according to claim 1 , wherein peak intensity of ultraviolet light emitted from the ultraviolet light emitting diode which initially emits ultraviolet light in the curing of the first ultraviolet curable ink is in the range of 800 mW/cm 2 to 1500 mW/cm 2 .
7. The ink jet recording method according to claim 1 ,
wherein the ultraviolet light emitting diode which initially emits ultraviolet light has a light emitting peak wavelength in a range of 360 nm to 420 nm.
8. The ink jet recording method according to claim 1 , further comprising:
discharging the first ultraviolet curable ink onto a recording medium;
curing the first ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light;
discharging the second ultraviolet curable ink onto a recording medium;
curing the second ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light; and
further curing the first ultraviolet curable ink and the second ultraviolet curable ink by irradiating the ink with ultraviolet light.
9. The ink jet recording method according to claim 1 ,
wherein the discharging of the first ultraviolet curable ink onto the recording medium and the curing the first ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light are performed after the discharging of the second ultraviolet curable ink onto a recording medium and the curing the second ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light.
10. An ink jet recording apparatus which is used with the ink jet recording method according to claim 1 .
11. The ink jet recording method according to claim 1 , wherein a total content of a monofunctional (meth)acrylate is from 40% by mass to 80% by mass with respect to the total mass (100% by mass) of the first ultraviolet curable ink.
12. The ink jet recording method according to claim 1 , wherein a total content of a bifunctional or more (meth)acrylate is from 5% by mass to 40% by mass with respect to the total mass (100% by mass) of the first ultraviolet curable ink.
13. The ink jet recording method according to claim 1 , wherein the first ultraviolet curable ink contains a monofunctional (meth)acrylate having an aromatic ring skeleton.