Ink housing device reliably preventing ink leakage

摘要

An ink accommodating pouch for accommodating ink is produced in the following manner. Two sheets formed of a synthetic resinous material are prepared. Four edges of both the sheets overlap each other and are oriented in the same direction. Three of the aligned edges are fused completely by heat, forming junctions. A resultant product is turned inside out so that the junctions of the three edges are turned inward and protrude inside a pouch. An ink extraction outlet is sealed to the remaining open edge. When the pouch is filled with ink, When the ink accommodating pouch 60 is filled with ink, the sheets near the junctions swell to a protruding curved shape on the outside of the pouch, enabling the pouch to accommodate an increased amount of ink.