Abstract 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 (3) of the bottle is recessed toward its interior in the form of a dome and an annular peripheral edge (4) for supporting the bottle itself is formed around the bottom wall, characterized in that a top portion (3a) of the bottom wall which is formed gradually thickly from the annular peripheral edge (4) 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 (5) and bottom bones (6) present between these hollow lugs.
A heat-resistant synthetic resin bottle (1) 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 (3) of said bottle is recessed toward its interior in the form of a dome and an annular peripheral edge (4) for supporting said bottle itself is formed around said bottom wall, characterized in that a top portion (3a) of said bottom wall (3) which is formed gradually thickly from said annular peripheral edge (4) to a central portion thereof is recessed upwardly from the underside of said top portion itself in order to thin said top portion, and said bottom wall between said top portion (3a) and said peripheral edge (4) is partially outwardly swollen out in order to radially form a predetermined number of triangular pyramid-shaped hollow lugs (5) and bottom bones (6) present between these hollow lugs.
Claim 2
Dependent Claim
154 words
A heat-resistant synthetic resin bottle (1) 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 (3) of said bottle is recessed toward its interior in the form of a dome and an annular peripheral edge (4) for supporting said bottle itself is formed around said bottom wall, characterized in that a top portion (3a) of said bottom wall (3) which is formed gradually thickly from said annular peripheral edge (4) to a central portion thereof is recessed upwardly from the underside of said top portion itself in order to thin said top portion, and said bottom wall between said top portion (3a) and said peripheral edge (4) is partially outwardly swollen out in order to radially form a predetermined number of triangular pyramid-shaped hollow lugs (5) and bottom bones (6) present between these hollow lugs.
Claim 3
Dependent Claim
38 words
The heat-resistant synthetic resin bottle according to Claim 1 wherein the bottoms (5b) of said triangular pyramid-shaped hollow lugs (5) are thin-wall, and the opposite sides (5c) of each lug are formed gradually thickly toward its ridge (5a).
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