A blow molding device in which pressure is accumulated in advance in a cylinder, which is used for providing pressurized an air space about a mouth of a preform to be molding into a container within a mold using a pressurized liquid. Pressure is also accumulated in advance in an accumulator. When a pressurized liquid is supplied into the preform, the opening-closing valve of the accumulator is opened to thereby apply the accumulated pressure within the accumulator to the liquid supplied into the preform, and the opening-closing valve is closed to thereby allow the accumulated pressure within the cylinder to pressurize the air space.

A pressure is accumulated in advance in a cylinder (35), which is used for conversion to air for the outside of a mouth, with an opening-closing valve (V3) of the cylinder (35) being closed, and when a pressurized liquid (L) is supplied into a preform (PF) through a blow nozzle (13) by actuating a plunger pump (31) and by opening a sealing body (15), the opening-closing valve (V3) of the cylinder (35) is opened to thereby apply the pressure accumulated in the cylinder (35) to the liquid (L) supplied into the preform (PF).

A blow molding device includes a blow molding mold to which a bottomed tubular preform is fitted, a blow nozzle that is fitted to a mouth tubular portion of the preform fitted to the mold, and a pressurized liquid supply unit configured to supply a pressurized liquid to the blow nozzle. The preform is to be molded into a shape conforming to a cavity of the mold by filling the liquid into the preform through the blow nozzle. The blow molding device further includes: a deaeration mechanism that is connected to the blow nozzle. The liquid is filled into the preform through the blow nozzle after air that is present within the preform fitted to the mold is sucked out by the deaeration mechanism.

A pressure is accumulated in advance in a cylinder (35), which is used for conversion to air for the outside of a mouth, with an opening-closing valve (V3) of the cylinder (35) being closed, and when a pressurized liquid (L) is supplied into a preform (PF) through a blow nozzle (13) by actuating a plunger pump (31) and by opening a sealing body (15), the opening-closing valve (V3) of the cylinder (35) is opened to thereby apply the pressure accumulated in the cylinder (35) to the liquid (L) supplied into the preform (PF).

A blow molding apparatus that supplies a pressurized liquid into a bottomed tubular preform fitted to a mold used for blow molding and molds the preform into a shape conforming to a cavity of the mold, the blow molding apparatus including: a blow nozzle fitted to a mouth tubular portion of the preform; a plunger pump configured to supply the pressurized liquid into the preform through the blow nozzle; and a control device configured to change an actuation rate and an actuation force of the plunger pump during the supply of the pressurized liquid into the preform to regulate a peak pressure of the liquid supplied into the preform to be from 3.5 MPa to 5.0 MPa.

A liquid-filled container manufacturing method including: the air discharge step of discharging air from an inside of a preform, by supplying a liquid at a level of pressure that does not cause stretching of the preform to the inside of the preform through an intra-tube channel formed between an inner peripheral surface of a spare supply tube extending through a blow nozzle and an outer peripheral surface of a spare supply rod provided radially inward thereof; and the liquid blow molding step of molding the preform into a container with a shape conforming to an inner surface of a mold, by stretching the preform downward using the spare supply rod and supplying a pressurized liquid to the inside of the preform through an intra-nozzle channel formed between an inner peripheral surface of the blow nozzle and the outer peripheral surface of the spare supply rod.

A method for forming plastic preforms into containers, wherein a transport device transports the preforms along a transport path. The transport device has a rotatable transport carrier where forming stations are arranged for forming the preforms into containers. The forming stations each have devices which apply a flowable medium to the preforms, and the apparatus has three pressure reservoirs which store the flowable and gaseous medium to expand the preforms. The preforms are applied to a first operating mode with a first pressure level stored in the first pressure reservoir, and at least one second and one third pressure levels stored in the second and third pressure reservoirs. The second pressure level is higher than the first, and the third pressure level is higher than the second. The apparatus is operated in a second operating mode, which differs from the first mode by pressure level prevailing in the second pressure reservoir.