| 摘要 |
<p>PURPOSE:To confine a deformable area of a resin-made container to a specified area where deformation occurs when the container is depressurized inside, by a method wherein the container has a barrel with a cross section of nearly a cylindrical shape, the curvature radius of the back side of the horizontal cross section is larger than that of the front side, and the center of the curvature radius of the back side if located closer to the front side than the center of the curvature radius of the front side is located. CONSTITUTION:A surface 11 from a front side B of a barrel in a deformable area to the both ends is shaped into an arc with a curvature radius R1 over one edge to the other. The center of the curvature R1 is concentrically located at the center O1 of a round barrel 8 and the curvature radius R1 is a little smaller than the external radius of the round barrel 8. A back side surface 12 has an arc-shape with a radius R2 and its middle part 12a comes close to the front side by a distance equivalent to the depth of a reinforcing groove 5 so that the back side surface 12 is level with the bottom of the reinforcing groove 5. The curvature radius R2 is satisfactorily larger than the curvature radius R1 of the front side surface 11, and the center O2 of the curvature radius R2 is located closer to the front side B than the center O1 of the curvature radius R1 of the front side surface 11 is located. The back side of the barrel 2 collapses when the container 1 is depressurized inside, but the front side remains unchanged in shape and maintains the arc-shape.</p> |
