초록 ▼

A process and apparatus for the injection-extrusion blow molding of a hollow tubular plastic product useful as a liquid container or the like, and which includes the steps of injecting a predetermined amount of the thermoplastic resin into a tubular cavity so as to form a tubular first preform havin

A process and apparatus for the injection-extrusion blow molding of a hollow tubular plastic product useful as a liquid container or the like, and which includes the steps of injecting a predetermined amount of the thermoplastic resin into a tubular cavity so as to form a tubular first preform having a closed end, and then axially extruding the tubular first preform so as to extend the bottom end and form a hollow second perform. The second preform is then blow molded outwardly against the internal surface of a blow mold to form a bioriented finish product. The first preform may be heat conditioned prior to the step of axially extruding the same, and the blow mold may be provided with an axially moveable bottom wall which permits a finished product to be formed having a substantially uniform wall thickness.

대표청구항 ▼

A method of molding a thermoplastic resin comprising the steps of injecting a predetermined amount of the thermoplastic resin into a tubular cavity so as to form a tubular first preform (3) having a closed end and an open end, including injecting the resin along a first axial direction extending fro

A method of molding a thermoplastic resin comprising the steps of injecting a predetermined amount of the thermoplastic resin into a tubular cavity so as to form a tubular first preform (3) having a closed end and an open end, including injecting the resin along a first axial direction extending from said closed end toward said open end, heat conditioning the first perform to bring the first preform from the thermoplastic state to a thermoelastic state to enable molecular biorientation, extruding the heat conditioned tubular first perform including pushing the closed end in a second axial direction which is opposite to said first axial direction so as to form a hollow second preform (11), and blow molding the second preform outwardly against the internal surface of a blow mold to form a molecularly bioriented finished product (14), including delivering pressurized gas into the interior of said second preform.