| 摘要 |
Large bottle body made of polyethylene terephthalate resin formed by biaxial stretching blow moulding has trunk parts (2) in the shape of angular tube. A central groove (3) is circumferentially provided nearly at the centre of the trunk part (2), and the angle of inclination of the side walls (4) of the groove (3) with respect to the direction of centre axis of a bottle body (1) is set within a range of 21-28 deg. A recessed part (7) whose bottom wall serves as a deformed panel wall (8) to cushion the depressurisation is provided in the centre of each flat wall (6) of the trunk part (2), a deformed circumferential groove (9) that curves inverted along the edge of the deformed panel wall (8). Rib streaks (21) are transversely provided in parallel above and below the deformed panel wall (8), the radius of curvature of the top of the rib streaks (21) is set larger than the radius of curvature of the valley parts, and, in addition, both ends of the valley parts are made shallow along a large radius curvature. The top edge of the trunk (2) is made in the shape of a regular polygon having twice as many angles as the trunk part (2), and the bottom edge (31) of a shoulder part (11) on the upper edge of the trunk part (2) is made in the shape of frustum of regular pyramid having twice as many angles as the trunk part (2). The edge connecting first (34,41) and second (33,42) wall parts is slightly extended forming a ridge line (44) curved/inverted with a small radius of curvature. @(38pp Dwg.No.1/12)@. |
