A liquid container manufacturing method includes: a liquid blow molding step of molding a preform into a liquid container; and a headspace formation step of forming a headspace, by discharging, in a state in which a liquid supply path is closed, a liquid out of the liquid container through a discharge port, the discharge accomplished by drawing-in by a liquid drawing source. In the headspace formation step, a pressurized gas is supplied from a pressurized gas supply source into the liquid container through a gas supply port to thereby assist the discharge, by the drawing-in, of the liquid out of the liquid container through the discharge port, and, when a pressure in a discharge path has increased to a set value, the supply of the pressurized gas by the pressurized gas supply source is stopped.

Blow molder system and associated method optimizes the performance, energy efficiency and/or operating costs of the blow molder. A blow molder controller executes a system model that relates blow molder input parameter changes to the characteristics of containers generated by the blow molder. Equipped with energy and/or operating cost data for operating the blow molder, the blow molder controller can select a set of blow molder input parameter changes for the blow molder that: drives the containers produced by the blow molder toward desired container characteristics, in an efficient amount of time, and in cost effective manner, considering the energy costs involved in implementing the changes.

A liquid blow molding apparatus for liquid blow molding a resin preform into a container having a prescribed shape. The apparatus includes a blow molding mold in which the preform is disposed; a blow nozzle that engages in an opening of the preform; a pressurized liquid supply that supplies a pressurized liquid to a supply path that is connected to the blow nozzle; and a seal member that is provided inside the supply path and opens and closes the supply path with respect to the blow nozzle. The pressurized liquid supply is configured to start supplying the pressurized liquid to the supply path after the seal member has begun to open.

In the manufacture of double-walled corrugated extruded pipe it is desirable to form an integral connecting cuff that is of a single wall thickness and typically of a large diameter. The mold blocks and process parameters for forming of the cuff as part of an otherwise double-walled pipe requires a transition as the cuff moves past the die outlets. The present invention allows for accurate sensing and control of air pressure and temperature as the cuff moves past the die outlets. Improvements in both the die tooling and the method of manufacture are disclosed.

Disclosed is a method for manufacturing a container from a blank in a mold provided with a movable insert, wherein the method includes the following phases: pre-blowing; blow molding; boxing; and the following operations: measuring the prevailing pressure in the blank in real-time and storing the measurement in a memory; measuring the position of the insert in real-time and storing the measurement in a memory; detecting a time t.sub.S2 indicating the actual start of the blowing phase and moment t.sub.B2 indicating the actual start of movement of the insert and storing same in a memory; calculating T1=t.sub.S2−t.sub.B2; comparing T1 with a predetermined non-zero reference T1.sub.ref, as long as T1 is different from T1.sub.ref, and delaying the start of the boxing phase.

Method of manufacturing containers by blow-molding in a mold starting from a plastic blank, involving, when manufacturing a container: —a step of introducing a blank into a mold; —at least a step of placing the inside of the blank in communication with at least one fluid circuit by an solenoid valve associated with the circuit; —at a predetermined moment, referred to as the solenoid valve opening pulse (TEV1; . . . ; TEV4), sending a command to open to the solenoid valve which has a theoretical opening delay (Dt1; . . . ; Dt4), the method including steps involving: —calculating the actual opening delay (De1; . . . ; De4) of the solenoid valve; —calculating a difference (Δt1; . . . ; Δt4) between the actual opening delay (De1; . . . ; De4) and the theoretical opening delay (Dt1; . . . ; Dt4); and—if the calculated difference is greater than a maximum permissible difference, emitting notification that a maximum permissible difference has been exceed.

When an injection stretch blow molding machine in which the molding cycle is tried to be shortened manufactures hollow molded bodies, blow molding in which shaping and cooling are simultaneously performed by blowing compressed air from a single compressed air supply source while discharging compressed air is performed to achieve energy saving for manufacturing hollow molded bodies.

A blowing apparatus 10 of a stretch blow molding apparatus 11 includes a compressed air supply source 32 configured to send out compressed air adjusted to have an air pressure at which an object to be shaped e is inflated to be shaped into a hollow molded body, an inflow passage 33 through which the compressed air from the compressed air supply source 32 flows to the internal space of the object to be shaped e disposed in a blow mold 8, and a non-closed outflow passage 34 through which the compressed air flows out from the internal space of the object to be shaped e to a discharging space outside the blow mold. In the entire process of the blowing operation by the blowing apparatus 10, a compressed air flow passage 36 is formed through which the compressed air from the compressed air supply source 32 flows through the inflow passage 33 and the internal space of the object to be shaped e and through the outflow passage 34 into the discharging space. Shaping and cooling are simultaneously performed by blowing the compressed air adjusted to have an air pressure at which the object to be shaped e being in the form of a preform is inflated to be shaped into the hollow molded body throughout the entire process of the blowing operation.

A method of producing a container (2) from a blank (3) made of plastics material within a mould (4) which is provided with a wall (5) defining a cavity (6) bearing the impression of the container (2), and with a mould base (8) which can move relative to the wall (5) between a retracted position in which it extends in set-back manner relative to the cavity (6) and a deployed position in which it closes the cavity (6). The method includes a boxing stage in which the mould base (8) moves from its retracted position to its deployed position, the travel (C) of the mould base (8) between its retracted position and its deployed position being greater than 20 mm.

A machine for expanding plastic parisons into plastic containers by a liquid medium with at least two transforming stations. These transforming stations fill and expand the plastic parisons with the liquid medium, with at least one pressure generating device. This pressure generating device is suitable and intended to deliver the liquid medium to at least one filling device which fills the plastic parisons with the liquid medium, wherein at least one shut-off device is installed in at least one connection channel between the pressure generating device and the filling device, inside which the liquid medium is conveyed. This shut-off device is configured and provided in order that a fluid path inside the connection conduit can be at least partially interrupted.

Blow molder system and associated method optimizes the performance, energy efficiency and/or operating costs of the blow molder. A blow molder controller executes a system model that relates blow molder input parameter changes to the characteristics of containers generated by the blow molder. Equipped with energy and/or operating cost data for operating the blow molder, the blow molder controller can select a set of blow molder input parameter changes for the blow molder that: drives the containers produced by the blow molder toward desired container characteristics, in an efficient amount of time, and in cost effective manner, considering the energy costs involved in implementing the changes.