| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce an applied amount of resin and improve efficiency of transportation and storage caused by light weight formation and small-sized formation at the time of scrapping by attaining a thin-walled formation of a bottle, in particular, an ultrathin walled formation of segment lower than a barrel segment. SOLUTION: This synthetic resin bottle is made such that an injection-molded pre-form is extended in a longitudinal direction within a blow die, the pre-form is expanded in a lateral direction by air blowing operation and a segment ranging from a shoulder 2 below a neck segment 1 to a barrel segment 3 is formed into a thin-walled segment. The shoulder 2 is formed to have a wall thickness of 0.2 to 0.3 mm. A segment ranging from an interface 5 of the shoulder 2 to a part lower than the barrel 3 is formed to have an ultrathin wall of 0.02 to 0.05 mm in such a way that the shoulder can be pushed into the barrel after use of the bottle to enable the bottle to be scrapped. A deformation strength of the barrel 3 is increased by notch of a lateral rib 6 of optional shape.</p> |
