| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a double layer container in which an inner layer made of synthetic resin which contracts as stored liquid is taken out is superposed on the inner surface of an outer layer made of synthetic resin having shape holding properties so as to be separated, and in which a hole forming work can be easily performed as compared to a conventional container without damage to the surface of the inner layer where the hole is formed. SOLUTION: A swelled part 9, which is swelled out at the time of the blow molding of a container, is provided and an outer layer 4 of the outer side surface of the container is cut off in a direction normal to the protruding direction of the part 9 after molding the container to form an air suction hole 8. As a result, when the outer layer 4 is cut off, an inner layer 5 moves inwardly so that troubles that the layer 5 is cut or injured can be avoided and moreover moving width of a cutting blade is not so severely required as compared with a conventional one.</p> |
