| 摘要 |
<p>A gas dissolved in ink is removed by passing the ink through hollow portions of a hollow yarn membrane having a gas permeability, an inner diameter of 50-500 νm and a thickness of 10-150 νm, preferably hollow portions of a composite hollow yarn membrane having a three-layer structure in which porous layers are provided on both surfaces of a non-porous layer, and vacuumizing outer surface portions of the hollow yarn membrane. According to this method, the deaeration of ink can be carried out with a low pressure loss, and, moreover, stably even when the pressure varies during a deaeration operation.</p> |
