| 摘要 |
PROBLEM TO BE SOLVED: To provide a seal structure for a mouth of a force feed container made of a plastic, in which an O-ring in the mouth is pressed and deformed to a predetermined size so that the mouth can be sealed while withstanding the pressure feed of gas and, further, in which a load from the side of the force feed container of the plastic does not adversely affect sealing properties. SOLUTION: A seal structure 22 for a mouth of this force feed container made of a plastic has a lid flange provided at a peripheral edge of a cap 24 for closing the mouth 23 of the container, a tightening ring 29 opposed to and tightened against the 11d flange with the aid of a bolt, and a mouth flange projecting in a cross-sectionally rectangular shape along an outer periphery near the mouth 23 of the force feed container of the plastic so that the mouth flange can be pinchingly held between the tightening ring 29 and the lid flange. |
