A method for operating a heating device for thermal conditioning preforms made of a thermoplastic material in which each respective one of the preforms is prepared for a subsequent forming process during which the preforms are formed into containers with a forming fluid fed under pressure into the preforms. The heating device is operated in at least a first operating state and a second operating state. The second operating state is a startup phase of the heating device during which a temperature of the heating device approaches an equilibrium temperature of a thermodynamically stable equilibrium state of the heating device. The first operating state is a continuous operation state following the startup phase. The second operating state is operated with a heating output value that varies over time. Furthermore, the invention relates to a heating device and a machine having a heating device, which are configured to implement the method.

A method for manufacturing a resin container includes: a first injection-molding step of injection-molding a bottomed cylindrical resin intermediate molded body; a second injection-molding step of injection-molding a resin material on an outer side of the intermediate molded body to manufacture a multilayered preform having a resin layer laminated on an outer peripheral side of the intermediate molded body; and a blow-molding step of blow-molding the preform to manufacture a resin container having a thick portion.

A manufacturing method for manufacturing a biodegradable resin container includes at least: an injection molding process of injection molding a preform made of a biodegradable resin in an injection molding mold; a temperature adjustment process of adjusting a temperature of the preform in a temperature adjustment mold; and a blow molding process of manufacturing a container by blow molding the preform after temperature adjustment in a blow mold, in which a temperature of the injection molding mold is set to 40° C. or lower.

Provided is a method for heating plastic preforms, wherein the plastic parison are transported along a predetermined transport path and are heated during this transport, wherein at least one first heating section with at least one first heating element as well as at least one second heating section with at least one second heating element is arranged along the transport path, by a first temperature measuring device an actual temperature of the plastic preforms is measured in or before a start region of the transport path, and as a function of this actual temperature of the plastic preforms the at least one first heating element is controlled in such a way that the plastic preforms reach a predetermined target temperature after heating by this at least one first heating element.

Method of heating a blank (2) of plastic material for the manufacture of a hollow body by forming from the blank (2), which comprises the operations consisting of: inserting the blank (2) into an oven (7) provided with sources (9) of monochromatic or pseudo-monochromatic electromagnetic radiation emitting in the infrared range; exposing the blank (2) to the radiation from the sources (9), adjusted to a predetermined emission power for a predetermined exposure time; measuring a temperature on an outer wall (16) of the blank (2);
Characterized in that it comprises an operation consisting of: adjusting the exposure time and/or the emission power so that said temperature at an exit from the oven (2) [sic: (7)], does not fall between T.sub.g and 1.8.Math.T.sub.g, where T.sub.g is the glass transition temperature of the material.

A core rod assembly (10) for blow molding includes a core rod head (16), a first fluid pathway (A1) extending along a first length of the core rod head (16), and a second fluid pathway (A2) extending along a second length of the core rod head (16). The first and second fluid pathways (A1, A2) may be fluidly isolated from each other and provide selective temperature control of respective first and second portions of the core rod assembly (10) during the blow molding process. At least a portion of the first fluid pathway (A1) may be longitudinally offset from the second fluid pathway (A2) so as to define respective first and second temperature zones (zone 1, zone 2) along the respective first and second portions of the core rod assembly (10).

A core rod assembly (10) for blow molding includes a core rod head (16), a first fluid pathway (A1) extending along a first length of the core rod head (16), and a second fluid pathway (A2) extending along a second length of the core rod head (16). The first and second fluid pathways (A1, A2) may be fluidly isolated from each other and provide selective temperature control of respective first and second portions of the core rod assembly (10) during the blow molding process. At least a portion of the first fluid pathway (A1) may be longitudinally offset from the second fluid pathway (A2) so as to define respective first and second temperature zones (zone 1, zone 2) along the respective first and second portions of the core rod assembly (10).

In a manufacturing apparatus for manufacturing a resin container which includes an injection molding part configured to injection-mold a preform, a temperature adjustment part configured to adjust a temperature of the preform molded in the injection molding part, and a blow molding part configured to blow-mold the preform whose temperature has been adjusted in the temperature adjustment part, the preform is carried into the temperature adjustment part before an outer surface temperature of the preform molded in the injection molding part becomes higher than an inner surface temperature of the preform molded in the injection molding part, and the preform is cooled to be lowered within a range equal to or higher than 10° C. and equal to or lower than 50° C. in the temperature adjustment part.

The invention relates to a method for operating a temperature control device (116) for the thermal conditioning of preforms (14) made of a thermoplastic material in the temperature control device (116), wherein the respective preform (14) is prepared by the thermal conditioning in the temperature control device (116) for a subsequent forming procedure, in which the preform (14) is formed into a container (12) using a forming fluid supplied under a pressure into the preform (14) and in which the preform (14) is stretched in its axial direction by a stretching unit (11), wherein the temperature control device (116) is regulated in its heating power by a heating regulator (400, B) on the basis of a metrologically determined guide value, and is characterized in that a guide value is metrologically detected, from which the stretching force exerted on the preform (14) is derivable. Furthermore, the invention relates to a temperature control device (116) for the thermal conditioning of preforms (14) made of a thermoplastic material which is regulated on the basis of the guide value, wherein the guide value is derived from the stretching force exerted by the stretching unit (11). Finally, the invention relates to a container production machine having a temperature control device as defined above.

The invention relates to a preform for producing a plastic container in a 2-stage stretch blow molding method, said preform having a preform body that extends along a central axis and that comprises: a first end a second end that lies opposite the first end, wherein the first end is closed and a neck part with a pouring opening adjoins the second end; and an inner wall that delimits an interior of the preform. Along a length of at least 30 mm of the interior, every point of the inner wall is at a distance of less than 3.5 mm from the central axis. Also disclosed are a suitable method and a device for producing such a preform.