Ink jet recording method and method for manufacturing laminated printed matter

1. An ink jet recording method comprising:

ejecting an active-radiation-curable ink composition onto a recording medium by an ink jet process; and

curing the ejected ink composition by irradiation with active radiation,

wherein, during transporting of the recording medium in the ejecting and the curing, an unwinding stress in the recording medium is larger than a winding stress in the recording medium,

wherein the recording medium has a thickness of 10 μm to 100 μm, and

wherein a value of subtracting the winding stress from the unwinding stress is 50 Pa to 250 Pa.

2. The ink jet recording method according to claim 1 , wherein F A is 2 to 17, F A being defined by the following equation:

F A =(unwinding stress−winding stress)/(volume shrinkage of ink composition after curing).

3. The ink jet recording method according to claim 1 , wherein the winding stress is 20 Pa to 160 Pa.

4. The ink jet recording method according to claim 1 , wherein the unwinding stress is 100 Pa to 270 Pa.

5. The ink jet recording method according to claim 1 , wherein the recording medium is a resin film containing at least one resin selected from the group consisting of polyethylene terephthalate, polyethylene, polypropylene, and nylon.

6. The ink jet recording method according to claim 1 , wherein the ink composition has a viscosity of 5 mPa·s to 30 mPa·s at 23° C.

7. The ink jet recording method according to claim 1 , wherein a light source of the active radiation is a light-emitting diode.

8. The ink jet recording method according to claim 1 , wherein the ink composition contains a polymerizable compound and a photopolymerization initiator.

9. The ink jet recording method according to claim 8 , wherein the polymerizable compound includes a di- or higher-functional polymerizable compound.

10. The ink jet recording method according to claim 9 , wherein a content of the di- or higher-functional polymerizable compound is 50% by mass or more based on a total mass of the ink composition.

11. The ink jet recording method according to claim 1 , wherein the ink composition is irradiated with the active radiation in an atmosphere with an oxygen partial pressure of 0.15 atm or less in the curing.

12. A method for manufacturing laminated printed matter, comprising laminating a lamination film on a surface, on which an ink composition has been cured, of printed matter produced by the ink jet recording method according to claim 1 .