A method of manufacturing a pressure vessel that includes heating a preform formed of a thermoplastic polymer, inserting a blow pin assembly that includes a bung portion and a plunger portion into an opening of the heated preform, clamping the heated preform between the bung portion and sections of a blow mold, extending the plunger portion into an interior of the heated preform to stretch the heated preform in the blow mold, and blowing air into the stretched preform under pressure to form the pressure vessel such that: (a) the pressure vessel includes a tank having a neck portion, a cylindrical body portion having a diameter of at least about 200 mm, and a bottom portion, (b) at least the thermoplastic polymer in the cylindrical body portion is biaxially oriented, and (c) threads are formed in the neck portion. Also a pressure vessel formed in accordance with the method.

A preform 20 comprises a neck portion 22 having an opening 21, a cylindrical barrel portion 23, and a bottom portion 24 larger in diameter than the barrel portion 23, and has a corner portion 25 at a boundary between the barrel portion 23 and the bottom portion 24.

A method of manufacturing a pressure vessel that includes heating a preform formed of a thermoplastic polymer, inserting a blow pin assembly that includes a bung portion and a plunger portion into an opening of the heated preform, clamping the heated preform between the bung portion and sections of a blow mold, extending the plunger portion into an interior of the heated preform to stretch the heated preform in the blow mold, and blowing air into the stretched preform under pressure to form the pressure vessel such that: (a) the pressure vessel includes a tank having a neck portion, a cylindrical body portion having a diameter of at least about 200 mm, and a bottom portion, (b) at least the thermoplastic polymer in the cylindrical body portion is biaxially oriented, and (c) threads are formed in the neck portion. Also a pressure vessel formed in accordance with the method.

A blow molded synthetic resin bottle has a body and an elongated neck with the body providing a shoulder extending about the base of the neck. The neck has a first collar extending thereabout spaced adjacent the shoulder and at least one additional collar extending thereabout adjacent the upper end of the neck. The resin in the neck is substantially unoriented. To produce the bottle, a synthetic resin preform is injection molded with a generally tubular body and the elongated neck. This preform is placed in a blow mold cavity having a body receiving portion and a neck receiving portion that has a recess extending thereabout seating the first collar therein. The additional collar is disposed outwardly of the mold cavity and is disposed on the upper surface of the mold.

Provided is a method for making barrier tube shoulders. The method includes forming a parison from a multi-layer laminated structure having an inner layer that faces an interior of the parison, an outer layer comprising an exterior surface of the parison, and an interdisposed layer between the inner layer and the outer layer, wherein the interdisposed layer is a flavor barrier layer. The method also includes providing an extrusion blow molding (EBM) mold comprising at least one cavity shaped as a barrier tube shoulder, positioning the parison in the EBM mold, and blow molding the parison such that the parison substantially conforms to the EBM mold to form a barrier tube shoulder having the barrier layer.

A blow molded synthetic resin bottle has a body and an elongated neck with the body providing a shoulder extending about the base of the neck. The neck has a first collar extending thereabout spaced adjacent the shoulder and at least one additional collar extending thereabout adjacent the upper end of the neck. The resin in the neck is substantially unoriented. To produce the bottle, a synthetic resin preform is injection molded with a generally tubular body and the elongated neck. This preform is placed in a blow mold cavity having a body receiving portion and a neck receiving portion that has a recess extending thereabout seating the first collar therein. The additional collar is disposed outwardly of the mold cavity and is disposed on the upper surface of the mold.

A preform 20 comprises a neck portion 22 having an opening 21, a cylindrical barrel portion 23, and a bottom portion 24 larger in diameter than the barrel portion 23, and has a corner portion 25 at a boundary between the barrel portion 23 and the bottom portion 24.

A blow molded synthetic resin bottle has a body and an elongated neck with the body providing a shoulder extending about the base of the neck. The neck has a first collar extending thereabout spaced adjacent the shoulder and at least one additional collar extending thereabout adjacent the upper end of the neck. The resin in the neck is substantially unoriented. To produce the bottle, a synthetic resin preform is injection molded with a generally tubular body and the elongated neck. This preform is placed in a blow mold cavity having a body receiving portion and a neck receiving portion that has a recess extending thereabout seating the first collar therein. The additional collar is disposed outwardly of the mold cavity and is disposed on the upper surface of the mold.

A blow molded synthetic resin bottle has a body and an elongated neck with the body providing a shoulder extending about the base of the neck. The neck has a first collar extending thereabout spaced adjacent the shoulder and at least one additional collar extending thereabout adjacent the upper end of the neck. The resin in the neck is substantially unoriented. To produce the bottle, a synthetic resin preform is injection molded with a generally tubular body and the elongated neck. This preform is placed in a blow mold cavity having a body receiving portion and a neck receiving portion that has a recess extending thereabout seating the first collar therein. The additional collar is disposed outwardly of the mold cavity and is disposed on the upper surface of the mold.

An apparatus for taking out molded product in a molding system has an insert portion, abutting portion, recess, and suction port. The insert portion is inserted in a hollow molded product via an opening portion serving as a blow pin extraction port of the hollow molded product. The abutting portion is arranged at the circumference of the insert portion and abuts on an outer circumferential surface of the hollow molded product spaced a predetermined distance from the opening portion serving as the blow pin extraction port. The recess is provided between the insert portion and the abutting portion, accommodates the opening portion in the state where the outer circumferential surface of the hollow molded product abuts on the abutting portion, and forms a stretch of closed space to the inside of the hollow molded product. The suction port is provided in the insert portion and sucks an ambient atmosphere.