Ink jet recording method and ink jet recording apparatus
Provided is an ink jet recording method by which even when a multicolor image is recorded with an ink jet recording apparatus including an ink storage portion having an ink inlet port arranged in its upper portion by applying a plurality of aqueous inks each comprising a pigment to a recording medium, an image excellent in abrasion resistance can be stably recorded over along time period. The method is an ink jet recording method for recording an image on a recording medium with an ink jet recording apparatus including: a plurality of aqueous inks each comprising a pigment; an ink storage portion; a recording head; and an ink supply path. The aqueous inks include a first ink to be applied earlier to the recording medium and a second ink to be applied later to the recording medium, and the first ink has a redispersibility index of 0.90 or more.
1. An ink jet recording method for recording an image with an ink jet recording apparatus comprising:
a plurality of aqueous inks, with each each aqueous ink of the plurality of aqueous inks comprising a pigment;
an ink storage portion having an ink inlet port arranged in an upper portion thereof, the ink storage portion being configured to store each aqueous ink of the plurality of aqueous inks;
a recording head having formed therein an ejection orifice configured to eject each aqueous ink of the plurality of aqueous inks supplied from the ink storage portion; and
an ink supply path configured to supply each aqueous ink of the plurality of aqueous inks from the ink storage portion to the recording head,
the recording being performed by applying each aqueous ink of the plurality of aqueous inks ejected from the ejection orifice to a recording medium,
wherein the plurality of aqueous inks includes a first ink to be applied earlier to the recording medium and a second ink to be applied later to the recording medium so as to overlap at least part of a region in the recording medium having applied thereto the first ink, and
wherein the first ink has a redispersibility index calculated by the following equation (1) of 0.90 or more:
redispersibility index= B/A (1)
where
A represents a mass (g) of a first residue obtained by leaving 2.0 g of the first ink to stand under an environment at 30° C. and a relative humidity of 10% for 16 hours, and
B represents a mass (g) of a second residue obtained by adding 1.2 g of the first ink to the first residue, stirring the mixture for 30 seconds, leaving the mixture at rest for 60 seconds, and then removing a component having flowability.
2. The ink jet recording method according to claim 1 , wherein the first ink has a redispersibility index of 0.95 or more.
3. The ink jet recording method according to claim 1 , wherein a static surface tension (γ 1 ) of the first ink and a static surface tension (γ 2 ) of the second ink satisfy a relationship of γ 1 >γ 2 .
4. The ink jet recording method according to claim 1 ,
wherein the recording head is a recording head of a serial type, and
wherein a scan delay is performed during a time period from the application of the first ink to the application of the second ink.
5. An ink jet recording apparatus comprising:
a plurality of aqueous inks, with each aqueous ink of the plurality of aqueous inks comprising a pigment;
an ink storage portion having an ink inlet port arranged in an upper portion thereof, the ink storage portion being configured to store each aqueous ink of the plurality of aqueous inks;
a recording head having formed therein an ejection orifice configured to eject each aqueous ink of the plurality of aqueous inks supplied from the ink storage portion; and
an ink supply path configured to supply each aqueous ink of the plurality of aqueous inks from the ink storage portion to the recording head,
wherein the plurality of aqueous inks includes a first ink to be applied earlier to the recording medium and a second ink to be applied later to the recording medium so as to overlap at least part of a region in the recording medium having applied thereto the first ink, and
wherein the first ink has a redispersibility index calculated by the following equation (1) of 0.90 or more:
redispersibility index= B/A (1)
where
A represents a mass (g) of a first residue obtained by leaving 2.0 g of the first ink to stand under an environment at 30° C. and a relative humidity of 10% for 16 hours, and
B represents a mass (g) of a second residue obtained by adding 1.2 g of the first ink to the first residue, stirring the mixture for 30 seconds, leaving the mixture at rest for 60 seconds, and then removing a component having flowability.