BOTTLE BODY MADE OF SYNTHETIC RESIN

摘要

This invention relates to the structure of a large type bottle body made of polyethylene terephthalate resin formed by biaxial stretching blow molding having trunk parts (2) in the shape of angular tube. A central circumferential groove (3) is circumferentially provided nearly at the center of the trunk part (2), and the angle of inclination of the both side walls (4) of said central circumferential groove (3) with respect to the direction of center axis of a bottle body (1) is set within a range of 21° - 28°. A recessed part (7) whose bottom wall serves as a deformed panel wall (8) to cushion the depressurization is provided depressed in the center part of each flat wall (6) of the trunk part (2), a deformed circumferential groove (9) that curves inverted along the circumferential edge of the aforementioned deformed panel wall (8), many rib streaks (21) are transversely provided in parallel above and below on the aforementioned deformed panel wall (8), the radius of curvature of the mountain parts forming said rib streaks (21) is set larger than the radius of curvature of the valley parts between said mountain parts, and, in addition, the both end parts of the aforementioned valley parts are made shallow along a large radius curvature. The top edge of the trunk part (2) is made to the shape of regular polygon having twice as many angles as the aforementioned trunk part (2) has, and the bottom edge part (31) of a shoulder part (11) connectively provided on the upper edge of said trunk part (2) is made to the shape of frustum of regular pyramid having twice as many angles as the aforementioned trunk part (2) has. The connnecting end edge from first wall parts (34, 41) among the two wall surface parts connected through the curved line to second wall parts (33, 42) is slightly extended to the sides of the aforementioned second wall parts (33, 42), and the extended connecting end edge of the first wall parts (34, 41) is connected to the connecting end edge of the second wall parts (33, 42) through the ridge line wall part (44) curved/inverted with a small radius of curvature.