DE102008032635A1 - Blow molding machine for stretch blow molding of plastic container e.g. polyethylene terephthalate bottle, has medium supply containing medium that is directed inside preform of plastic container or container by blow molding nozzle - Google Patents

Abstract

The machine (3) has multiple multipart molding carriers (12) carrying a multipart blow mold which accommodates a heated preform. A part of the blow mold is connected with a medium supply. Medium i.e. air, in the medium supply is directed inside the preform of a plastic container or the plastic container by a blow molding nozzle during blow molding process, where temperature of the medium is in the range of 80-140 degree Celsius. A compressor is provided in the supply which supplies the medium with a pressure required for blow molding process. An independent claim is also included for a method for micro-biologically optimized manufacturing of plastic container.

Description

The The present invention relates to a blowing machine. In particular The invention relates to a blow molding machine for the production of plastic containers from preforms. The blowing machine includes a variety of multipart Mold carriers, each of which is a multi-part blow mold carrying the heated preform. At least part of the blow mold is with a feeder connected to a medium, the medium over a blowing nozzle during the blowing process in the Interior of the preform of the respective plastic container, the Vorblaslinge or the plastic container is conductive.

Further The invention relates to a method for microbiologically optimized Production of plastic containers.

A blow molding machine is used in particular for stretch blow molding of preforms. The blow molding machine itself comprises at least one blow mold. For the stretch blow molding of preforms to plastic containers blow molds are used, in which a preform with positive pressure inside the blow mold blown, that is, auskonturiert. The blow mold can be z. B. at least two mold halves, which are rotatably mounted about a common axis. By turning about this axis, the mold halves can be closed, so that forms a cavity in the interior of the limited by the two mold halves blow mold, in which a preform can be molded. The design of such a mold carrier is z. B. in the European patent EP 1 276 598 B1 disclosed.

The European patent EP 1 086 019 B1 discloses a method and apparatus for producing sterile packaging containers. The thermoplastic container is brought to a temperature which is below the deformation temperature of the material of the thermoplastic container. However, the temperature is above the temperature of the gas phase of a sterilizing material. Finally, the sterilization material is removed with hot air. Thereafter, the final shape of the plastic container is blown with sterile air. This method uses a chemical for sterilization and yet can not avoid the contamination in the lead to the blow mold.

The European patent EP 0 996 530 B1 discloses a method for manufacturing sterile containers made of plastic material and a system for carrying out the method. The substance used for the sterilization is introduced into the heated preforms. The material for sterilization can be activated at a certain temperature of the preforms. The blow molding of the containers takes place with filtered air. However, with this method, it is unavoidable that contamination will be encountered in the transition from the oven for heating the preforms to the blow molding machine.

task The invention is to provide a blow molding machine capable of is the recontamination of previously sterilized preforms to prevent the blowing process and which ensures that one Contamination in the blowing machine itself is avoided.

The The above object is achieved by a blowing machine, the the features of claim 1 comprises.

A Another object of the invention is a method for microbiological to create optimized production of plastic containers in which the sterilization of plastic containers without performs chemical agents while ensuring that a contamination of the plastic container in the self Blowing machine is avoided.

It has been shown to blow each mold with a feeder connected to a medium. The medium is over a blowing nozzle during the blowing process in the Interior of the preform of the respective plastic container and during the blowing process in the Vorblaslinge and ultimately also passed into the finished blown plastic container. The medium has a temperature between 80 ° C to 140 ° C.

The Medium is preferably air that is pressurized by a compressor becomes. Likewise, the air before being fed to the blowing preforms cleaned by a suitable filter system. The compression heat generated by the compressor can at least be used in part, the medium on the for the Blowing required temperature to bring. Should the compression heat the compressor is insufficient or z. B. by heat loss lost too much heat in the supply line to the blower can go, a heater in the feeder for be provided with the medium that the medium on the for the blowing process required temperature brings.

As well it is conceivable that the heating device exclusively the medium to the temperature required for the blowing process brings.

It is advantageous if all components of the blow molding machine, which come into contact with the preform and all supply lines for the required for the blowing process medium at a temperature of at least 100 ° C and higher tempered. This ensures that even a possible, set in hidden places, contamination ver can be avoided.

at the method for the microbiologically optimized production of plastic containers First, each is a heated preforms in each case a multi-part mold carrier of the blow molding machine for Production of plastic containers used. Everyone who Variety of mold carriers carries a multipart Blow mold. At least part of the blow mold is with a feeder connected to a medium. The medium is over a blowing nozzle during the blowing process in the Interior of the preform of the respective plastic container, at a temperature between 80 ° C to 140 ° C passed.

in the Below are embodiments of the invention and their advantages with reference to the accompanying figures closer explain.

1 shows a schematic representation of a blow molding machine, which is connected to a furnace, which supplies the blow molding machine, the preforms with a defined temperature.

2 shows a schematic representation of the upper portion of a plastic container, which is connected to a blowing nozzle, which in this case is the part of the multi-part blow mold.

3 shows a schematic representation of the supply of the medium to the individual mold carriers, which are provided in the blow molding machine.

The The following description refers to parts of the blow mold, the connected to a media feeder. This is just one of many embodiments. Depending on requirements of the produced plastic container or to be produced Plastic bottles are all parts of the blow mold with a media supply provided or at least only a certain part of the blow mold provided with a media feeder. It should also be noted that in the different figures for the same elements or the same elements used the same reference numerals becomes.

1 shows a schematic view of an apparatus, are made with the plastic containers substantially by a stretch blow molding. In the following description, the term "plastic bottle" is used as a matter of course for the term "plastic container". The device 1 consists essentially of an oven 2 in which preforms (not shown) for the plastic bottles to be produced are brought to a specific temperature, so that the plastic bottles can be produced from these preforms by blow molding or stretch blow molding. With the oven 2 is a blowing machine 3 connected. In the oven 2 is a conveyor 4 provided a variety of preforms to a heater 5 passes. To the interior of the oven 2 there is the transport device 4 using heat-reflecting tiles 6 shielded. At a transfer position 7 the preforms are placed in the oven 2 initiated. At an issue position 8th The heated preforms are at an input position 9 for the blowing machine 3 to hand over. At an issue position 10 the blow molding machine, the finished plastic bottles for further processing, or for filling (not shown) output.

In the in 1 The illustration shown includes the blow molding machine 3 a transport device 11 on which the variety of mold carriers 12 is arranged. In the schematic illustration of the blow molding machine shown here 3 , is the transport device 11 designed as a wheel. It is also conceivable that the transport device 11 is designed as a substantially linear transport device. The blowing machine 3 is of several walls 14 enclosed.

2 shows a schematic representation of the blowing process, wherein the shape to be blown (plastic bottle, plastic container 22 ) with a blowing nozzle 20 connected is. The plastic container 22 has at its upper end a thread 24 and a support ring 23 on. The plastic container 22 may be, for example, a PET bottle, as well as a PET beverage bottle. The plastic container 22 is on the tuyere 25 fitted and connected to this pressure-tight (any seals are not shown). The tuyere 25 has a stretch rod 26 which can be used in the blowing process. In 2 is shown a state in which the blow molding of the plastic container 22 already done. The multi-part blow mold itself, the plastic container 22 surrounds, is not shown for clarity. It is obvious to a person skilled in the art that the terms preform, plastic container 22 or Vorblasling are interchangeable. The individual terms represent only stages that a plastic container 22 before its completion during the blowing process. The medium is blown in at a temperature in the range between 80 ° C to 140 ° C until from the preform of the finished plastic container 22 originated.

From one in 3 illustrated pressure source (compressor 30 ) performs a Druckmittelweg or supply 32 to the mold carriers 12 and finally to the tuyere 25 , The pressure medium path or feed 32 is with a valve 27 shut off. The tuyere 25 is further with a pressure medium discharge path 28 connected with a valve 29 can be locked. The pressure medium discharge path 28 For example, it may open into a muffler (not shown).

3 shows a schematic representation of the supply of the medium to the individual mold carriers 12 (Ultimately, the at least one tuyere 25 ), which in the blowing machine 3 are provided. In the pressure medium path or feed 32 is a compressor 30 provided for the blow molding of the plastic container 22 required pressure generated. The compressor 30 can both a filter 34 upstream and downstream. The filters 34 serve to clean the air required for blowing the plastic bottles (or medium or inert medium). In a further embodiment of the device, a heating device 36 in the feeder 32 be provided. The heater 36 can z. B. exclusively used to bring the medium to the temperature required for the blowing process. The temperature of the medium should have a temperature between 80 ° C and 140 ° C. It is also conceivable that only the compression heat of the compressor 30 sufficient to reach the temperature required for sterilization. The use of the medium within the temperature interval described above has the advantage that all components of the blow molding machine 3 , Which come into contact with the preform and also all the supply lines for the required for the blowing process medium at a temperature of at least 100 ° C are tempered. At the in 3 For reasons of clarity, not all blow molds or mold carriers are shown 12 with the supply line 32 connected.

Since the blowing medium or the blowing air is used with a temperature between 80 ° C and 140 ° C, all components of the blow molding machine 3 , which come into contact with the blowing medium, at a temperature in this temperature interval. Thus, the settlement of germs is permanently avoided and indeed in very inaccessible places within the complex air distribution system. Likewise, all components that come into contact with the preform are at this elevated temperature. This is especially the stretch rod 26 important, since these with each blow process with the plastic containers 22 is in contact. Despite the temperature range in which the medium is used for the blowing process, there is no deformation of the plastic container 22 because the contact times of the medium with the plastic container are relatively short.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1276598 B1 [0003]
• - EP 1086019 B1 [0004]
• EP 0996530 B1 [0005]

Claims (12)

Blowing machine ( 3 ) for the production of plastic containers ( 22 ) preforms, wherein the blow molding machine ( 3 ) a plurality of multi-part mold carriers ( 12 ), each of which carries a multi-part blow mold, which receives the heated preform that at least a portion of the blow mold with a feed ( 32 ) is connected to a medium, wherein the medium via a blowing nozzle ( 20 ) during the blowing process into the interior of the preform of the respective plastic container ( 22 ), the Vorblaslinge or the plastic container ( 22 ) is conductive, characterized in that the medium has a temperature between 80 ° C to 140 ° C. Blowing machine ( 3 ) according to claim 1, characterized in that the medium is air. Blowing machine ( 3 ) according to claims 1 and 2, characterized in that a compressor ( 30 ) in the feeder ( 32 ) is provided, which acts on the medium with a pressure required for the blowing process. Blowing machine ( 3 ) according to claim 3, characterized in that the from the compressor ( 30 ) generates at least in part the medium to the temperature required for the blowing process. Blowing machine ( 3 ) according to one of claims 1 to 4, characterized in that a heating device ( 36 ) in the feeder ( 32 ) is provided, which brings the medium to the temperature required for the blowing process. Blowing machine ( 3 ) according to one of claims 1 to 5, characterized in that all components of the blow molding machine ( 3 ), which come into contact with the preform and all supply lines for the required for the blowing process medium at a temperature of at least 100 ° C are tempered. Process for the microbiologically optimized production of plastic containers ( 22 ), characterized by the following steps: • that in each case a heated preform in each case a multi-part mold carrier ( 12 ) of the blowing machine ( 3 ) for the production of plastic containers ( 22 ), each mold carrier ( 12 ) carries a multi-part blow mold; and that at least a part of the blow mold with a feed ( 32 ) for a medium, so that the medium via a blowing nozzle ( 20 ) during the blowing process into the interior of the preform of the respective plastic container ( 22 ), the Vorblaslinge or the plastic container ( 22 ) is passed at a temperature between 80 ° C to 140 ° C. Method according to claim 7, characterized in that that air is used as the medium. Method according to claim 7 or 8, characterized in that a compressor ( 30 ) in the feeder ( 32 ) is provided, through which the medium is subjected to a pressure required for the blowing process. A method according to claim 9, characterized in that the from the compressor ( 30 ) generated compression heat is at least partially supplied to the medium. Method according to claim 7 to 10, characterized in that a heating device ( 36 ) in the feeder ( 32 ) is introduced for the medium with which the medium is brought to the temperature required for the blowing process. A method according to claim 7 to 11, characterized in that all components of the blow molding machine ( 3 ), which come into contact with the preform and all supply lines ( 32 ) are tempered at a temperature of at least 100 ° C for the medium required for the blowing process.