Ink jet recording apparatus

An image forming apparatus for forming an image by using a recording head for discharging ink, the apparatus comprising:

• conveyance means for conveying a recording medium at a position where the conveyance means faces the recording head;
• and
• heating means for heating the recording medium such that a surface temperature ranges from 60 degrees Celsius to 140 degrees Celsius at a portion where recording is completed in the recording medium,
• wherein the ink contains at least 16% by weight of curl control agent, and the ink contains at least 60% by weight of water,
• wherein the heating means evaporates moisture in ink deposited on the recording medium to increase the viscosity of the ink,
• wherein the heating means heats the recording medium at the time when the curl is not generated to evaporate water content included in the aqueous ink, and
• wherein the heating means is activated when an ink discharge amount per area is not less than 2.23 ml/mm2 and not activated when the ink discharge amount per area is less than 2.23 ml/mm2.

An ink jet recording apparatus in which an image is formed by imparting aqueous ink discharged from a recording head onto a recording medium,

• wherein the aqueous ink contains at least a predetermined amount of curl control agent,
• wherein the aqueous ink has viscosity lower than 4 cp,
• wherein the ink jet recording apparatus includes heating means for heating the recording medium to evaporate water content included in the aqueous ink so that the viscosity of the aqueous ink increases, whereby curl generation in the recording medium after the image formation is suppressed,
• wherein the heating means heats the recording medium at the time when the curl is not generated to evaporate water content included in the aqueous ink,
• wherein the curl control agent includes 1,2,6-hexanetriol or trimethylolpropane, and
• wherein the heating means is activated when an ink discharge amount per area is not less than 2.23 ml/mm2 and not activated when the ink discharge amount per area is less than 2.23 ml/mm2.

An image forming apparatus for forming an image by using a recording head for discharging aqueous ink, the apparatus comprising:

• a conveyance belt for attracting a recording medium by an electrostatic force so that the whole surface of the recording medium P is brought into contact with the conveyance belt, and for conveying a recording medium at a position where the conveyance belt faces the recording head;
• and
• heating means for heating the recording medium to evaporate water content included in the aqueous ink so that the viscosity of the aqueous ink increases, whereby curl generation in the recording medium after the image formation is suppressed,
• wherein the heating means is arranged at a position where the heating means performs heating on a downstream side of a region where the recording head forms the image,
• wherein the heating means heats the recording medium at the time when the curl is not generated to evaporate water content included in the aqueous ink,
• wherein the heating means is activated when an ink discharge amount per area is not less than 2.23 ml/mm2 and not activated when the ink discharge amount per area is less than 2.23 ml/mm2, and
• wherein the heating means is disposed on the opposite side of the conveyance belt to the recording head.