HEAT-RESISTANT SYNTHETIC RESIN BOTTLE

摘要

Here is disclosed a heat-resistant synthetic resin bottle which is biaxially oriented by axially stretching and air blowing an injected or extruded closed-end parison in a blow mold to carry out molding, whereby a bottom wall of the bottle is recessed toward its interior in the form of a dome and an annular peripheral edge for supporting the bottle itself is formed around the bottom wall, characterized in that a top portion of the bottom wall which is formed gradually thickly from the annular peripheral edge to a central portion thereof is recessed upwardly from the underside of the top portion itself in order to thin the top portion, and the bottom wall between the top portion and the peripheral edge is partially outwardly swollen out in order to radially form a predetermined number of triangular pyramid-shaped hollow lugs and bottom bones present between these hollow lugs.