The invention relates to a method for manufacturing a container (2), by drawing and blowing in a mould (8), from a blank (3) made of plastic material, which includes the following operations: inserting the blank (3) in the mould (8); controlling the opening of a pre-blowing solenoid valve (17) at a predetermined pre-blowing rate (D.sub.P); measuring the current pressure (P) inside the blank (3); detecting an actual time (t.sub.A) for starting the pre-blowing step; calculating a time (t.sub.F) for ending the pre-blowing step such that: t.sub.F=t.sub.A+t, wherein: t is a predetermined time for opening the pre-blowing solenoid valve and is a predetermined constant; deducing therefrom an actual pressure (P.sub.F) at the end of the pre-blowing step; comparing said pressure to a theoretical pressure (P.sub.th); and if said pressures are found to be non-identical, ordering a modification of the pre-blowing rate (D.sub.P).

The method wherein plastic preforms are formed into plastic containers by application of a flowable medium wherein the plastic preforms are biased with different pressure levels and the flowable medium is stored in at least two reservoirs and is supplied from these reservoirs to the plastic preforms, wherein at least one of these reservoirs is supplied with the flowable medium by a pressure supply device and wherein the flowable medium is returned at least temporarily from the plastic container to at least one of these reservoirs, wherein a pressure in at least one reservoir is controlled, and wherein a target pressure is compared with an actual pressure in this reservoir, and a value characteristic of this comparison is determined.

Method for controlling a method for the manufacture of a container by stretch-blow-molding of a plastic preform (2) in a machine (1) including a mold (26), the preform (2) having a body (3), a neck (4) opening at one end of the body (3) and a bottom (5) closing the body (3) at another end thereof, the manufacturing method including the operations involving:heating the preform to a predetermined temperature in a thermal conditioning oven (10);introducing the preform (2) into the mold (26);moving a stretching pin (28) so as to stretch the preform (2); this control method involving a step that consists in determining the position of impact (P0r) of the stretch pin (28), namely the position it occupies at the moment at which it reaches the bottom (5) of the preform (2) during its movement.

The present invention relates to a mold for a multi-layer container. The mold includes a cold-half portion containing a cavity, and a hot-half portion containing a first resin flow path for connecting an interior of a first injection cylinder to the cavity, a second resin flow path for connecting an interior of a second injection cylinder to the cavity, and a junction portion of the first resin flow path and the second resin flow path. The junction portion in the hot-half portion is positioned upstream of a gate portion opened to the cavity included in the cold-half portion, the second resin flow path contains an inhibitor for partially inhibiting a resin flow.

Method of manufacturing a container (2) by stretch-blow molding in a mold (8) from a blank (3) of plastic material, which comprises the operations consisting of: measuring the pressure prevailing inside the blank (3) during a pre-blowing phase; detecting an instant corresponding to a local minimum pressure in the blank (3); placing in memory the instant at which said minimum pressure occurs as well as the corresponding pressure prevailing in the blank (3); comparing the instant and the pressure of the detected minimum with, respectively, a predetermined instant and pressure of a theoretical minimum pressure; if the measured minimum and the theoretical minimum do not coincide, ordering a modification of at least one of the following parameters: pre-blowing pressure, pre-blowing flow rate, stretching speed, heating temperature.

Method of manufacturing a container from a blank of plastic material, within a mold provided with a wall defining a cavity with the impression of the container, and a mold bottom that is movable with respect to the wall between a retracted position and a deployed position in which it extends protruding into the interior of the cavity in order to form a hollow recess in the container. The method includes inserting the blank into the mold; a pre-blowing operation including injecting a fluid under pressure into the blank, at a pre-blowing pressure; a blowing operation including injecting a fluid under pressure into the blank at a blowing pressure that is greater than the pre-blowing pressure; and a boxing operation, initiated prior to the blowing operation, and including moving the movable mold bottom from its retracted position to its deployed position.

A stretch blow molding system (200) is provided. The stretch blow molding system comprises a cylinder (201) including a movable stretch rod (202) and a blow-mold valve (204). The blow-mold valve (204) comprises a first fluid port (204a) in fluid communication with a first pressurized fluid source (364a). The blow-mold valve (204) also includes a second fluid port (204b) in fluid communication with a second pressurized fluid source (364b). A third fluid port (204c) of the blow-mold valve is in fluid communication with the cylinder (201) and selectively in fluid communication with the first fluid port (204a) and the second fluid port (204b).

A method of forming a container includes blow molding a primary form of the container inside a primary mold. The primary form has an exterior surface. The method also includes applying a fluid to the exterior surface of the primary form to shrink the primary form and to form a shrunken form of the container. Furthermore, the method includes blow molding a secondary form of the container from the shrunken form inside a secondary mold.

In a blow moulding machine for the production of plastics material containers, during a blow mould procedure, the container to be expanded is supplied with blow moulding air from a first gas preparation device on the one hand or from a second gas preparation device on the other hand. During this procedure a cooling of the base of the container is additionally carried out.

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.