Abstract:
A blow molding machine for shaping plastics material pre-forms into plastics material containers, has a plurality of blow molding stations with blow mold carriers for holding blow molds, including a clean room for arranging or conveying the blow molding stations under aseptic conditions and having an installation access to the clean room for installing the blow mold carriers with blow molding station components. The installation access includes at least one sterile room which is positioned in front of the clean room with the plurality of blow molding stations on the environment side.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a blow moulding machine for shaping plastics material pre-forms into plastics material containers, comprising a plurality of blow moulding stations with blow mould carriers for holding blow moulds, comprising a clean room for arranging or conveying the blow moulding stations under aseptic conditions and comprising an installation access to the clean room for installing the blow mould carriers with the blow moulding station components. 
     The invention also relates to a method of exchanging components of a blow moulding station in a clean room of a blow moulding machine, in which the clean room is opened and in which the blow moulding station components are exchanged. 
     In addition, the invention relates to both a beverage filling plant and a beverage container production plant. 
     Generic blow moulding machines, in particular stretch blow moulding machines, beverage filling plants and/or beverage container production plants are well known from the prior art. 
     By way of example, the Offenlegungsschrift (Laid-Open specification) DE 10 2008 038 141 A1 discloses a plant for the production of plastics material containers with a clean room in which the plastics material containers are both produced and filled with beverages. In this respect the production plant comprises an apparatus for shaping plastics material pre-forms into the plastics material containers and a filling device for the latter. The shaping apparatus has a plurality of blow moulding stations with blow mould carriers for holding blow moulds, in which the plastics material pre-forms are expanded to form the plastics material containers. The subject matter of DE 10 2008 038 141 A1 is hereby made the content of the disclosure of the present application by reference in its entirety. It is to be understood that in order to produce plastics material containers of different design, for example with respect to a volume and/or a contour, it is also necessary for different blow moulds to be used on the shaping apparatus. A corresponding exchange is carried out manually on the shaping apparatus in this case in that a first blow mould set with blow moulds of a first type is exchanged for a further blow mould set with blow moulds of a second type. After the exchange, it is necessary to sterilize not only the new blow moulds inside the clean room in order to prevent contamination of the plastics material pre-forms or the plastics material containers respectively with germs, but also the previously opened clean room itself. 
     In order to facilitate an exchange of the blow moulds, it is known to keep a set of blow moulds to be exchanged in a mobile magazine apparatus in which the blow moulds are received individually on receiving means of a carrier device. In this case a transfer of the individual blow moulds between a blow moulding station of a shaping apparatus and the magazine apparatus can be carried out manually or at least in a semi-automated manner. Some mobile magazine apparatus can have in this case a cleaning device, by means of which the blow moulds can be rinsed, brushed, polished, disinfected and/or sterilized for example at the same time. 
     As a result, although blow moulds which are already sterilized and therefore ready for use immediately can be produced, there is always nevertheless a risk that the clean room will be contaminated during the opening and so a sterilization of the clean room and the devices, tools etc. present in it will necessarily have to be carried out after the exchange of the new blow moulds. This, however, leads to a considerable delay in the production. 
     SUMMARY OF THE INVENTION 
     The object of the invention is further to develop generic plants, in particular generic stretch blow moulding machines, in such a way that the risk of contamination of the clean room and the devices and tools present in it with germs is eliminated. 
     This object is attained on the one hand by a blow moulding machine for shaping plastics material pre-forms into plastics material containers, comprising at least one and preferably a plurality of blow moulding stations with blow mould carriers for holding blow moulds, comprising a clean room for arranging or respectively conveying the blow moulding stations under aseptic conditions and comprising an installation access to the clean room for installing the blow mould carriers with blow moulding station components, in which the installation access comprises at least one sterile room which is positioned in front of the clean room with the plurality of blow moulding stations on the environment side. 
     According to the invention, as well as the actual clean room in which the treatment, i.e. in particular the production and/or the filling, of the plastics material containers is carried out, a further sterile room is present through which an exchange of the blow moulds at an installation access of the blow moulding machine under sterile or aseptic conditions is made possible. By means of this novel installation access the actual clean room of the blow moulding machine can be opened without risk in order to exchange a set of blow moulds, without either the clean room or devices present in it, such as for example blow moulding tools, being contaminated in this case by germs from the environment. 
     The present invention is advantageous particularly in the beverage industry, since in particular plastics material beverage bottles and beverages to be filled into them, which are highly susceptible to germs, are frequently processed there. The object of the invention is therefore also attained on the other hand by a beverage filling plant and/or a beverage container production plant which is characterized by the present blow moulding machine. 
     It is possible, in addition, for an installation access with an additional sterile room of this type to be capable of being used with advantage on a beverage filling plant or on a beverage container production plant respectively in a multiplicity of regions or treatment machines. By way of example, on a filling machine or on a rinsing machine for changing CIP caps, in a closing machine for changing crown stoppers, in a cleaning or sterilization machine with nozzles dependent upon the containers and also in general for changing format parts in container-conveying units. 
     In this case, in the sense of the invention, the term “clean room” describes a process room in a processing line of the blow moulding machine, in which the plastics material containers are treated under sterile conditions in a manner dependent upon the process. 
     In the sense of the invention, the term “sterile room” describes a region of the blow moulding machine through which components associated with the machine can be moved under sterile conditions into the clean room or can be removed out of the latter. 
     It is preferable for the clean room to be capable of being connected to the sterile room in terms of flow. It is advantageous for a flow connection between the clean room and the sterile room to be capable of being interrupted. 
     The expression “blow moulding machine” also covers, in particular, a stretch blow moulding machine. 
     In an advantageous manner the blow moulding station components can embrace in particular blow moulds, floor moulds, stretch bars, stretch bar stops, holding clamps, gripping clamps, blow moulding nozzles or the like. 
     A preferred variant of embodiment provides that the installation access comprises an environment lock for access to the sterile room on the one hand and an exchange lock for separating the blow moulding station components into and out of the clean room on the other hand. As a result, access to the sterile room can take place without difficulty, without the risk of contamination of the clean room. 
     In this case the sterile room can advantageously be equipped with blow moulding station components, whilst it is still separated from the clean room. If an equipping of the sterile room is carried out and the environment lock is closed again, a sterilization of the sterile room and the blow moulding station components arranged in it can be carried out. After that, the exchange lock and thus the clean room can be opened without risk. 
     In this respect the object of the invention is also attained by a method of exchanging components of a blow moulding station in a clean room of a blow moulding machine, in which the clean room is opened and in which the blow moulding station components are exchanged in particular in the opened clean room, the blow moulding station components being exchanged under sterile conditions. 
     It is advantageous for the blow moulding station components to be exchanged in a sterile room or through a sterile room in a sterile environment, since installation times can be considerably reduced as a result. 
     If the environment lock and the exchange lock are directly opposite each other, the installation access can have a very compact design, since, in particular, blow moulds can be separated out in an opposed manner through the installation access. 
     It is possible for a sterile room of the installation access to be capable of being formed in the same way by a suitably designed housing of a clean room. 
     If the installation access has a housing which envelops the sterile room and which is arranged in a releasable manner on a wall of the clean room, it is also possible in an advantageous manner for conventional or already constructed blow moulding machines to be retrofitted in a simple manner. 
     In particular, an installation access releasable in this way with the housing enveloping the sterile room can also advantageously be re-positioned or arranged temporarily in different regions of a beverage container treatment plant, namely where a corresponding installation procedure is currently to be carried out under sterile conditions. 
     A particularly preferred variant of embodiment thus also provides an exchange lock for separating the blow moulding station components into and out of the clean room, in which case the exchange lock comprises a separating wall—capable of being opened—of the installation access, preferably a separating wall on the side towards the sterile room and a separating wall on the side towards the clean room. 
     The installation access can be removed without difficulty from the wall of the clean room, for example for maintenance purposes, when the separating wall on the side towards the clean room is closed, since contamination of the clean room by germs can be eliminated. If the separating wall on the side towards the sterile room is then also closed, the risk of contamination on the side towards the sterile room can also be eliminated. In particular, this can also be advantageous when moving the present installation access. 
     In addition, it is advantageous for the installation access to comprise a device capable of being actuated automatically or at least semi-automatically for transferring the blow moulding station components from the sterile room into the clean room and/or vice versa. As a result, an exchange of the blow moulding station components can be accelerated, as a result of which the installation time can advantageously be reduced. 
     In an advantageous manner the transfer device has a gripper for gripping and transferring the blow moulding station components, by means of which for example each blow mould can be gripped. In this way, in particular, a blow mould to be exchanged can be removed from a blow mould carrier of a blow moulding station by means of the gripper and can be transferred into a free receiving means inside the installation access. After that, a new blow mould can be taken out of a further receiving means of the installation access and can be transferred to the blow mould carrier emptied beforehand. This procedure can be continued until the complete set of blow moulds is exchanged. 
     It is to be understood that an exchange of this type can also be carried out manually or by means of aids designed in a different manner. 
     In addition, it is advantageous for the installation access to comprise a blow moulding station component holding device which is preferably capable of being rotated, so that an installation procedure, in particular of a complete set of blow moulds, can be carried out in a rapid and simple manner. It is possible for holding devices designed in different ways also to be used. In order that a coordination between the individual devices, such as for example the exchange lock, the preferably rotatable blow moulding station component holding device, a blow mould wheel on the side towards the clean room and the transfer device, can be automated, it is advantageous for a control apparatus, by means of which the corresponding operational sequences can be carried out in an automated manner at least in part, to be provided for this purpose. 
     In addition, it is advantageous for the installation access to comprise a sterile gas supply which has a connection to a sterile gas preparation means for the clean room. In this way, a sterilization can be carried out in a simple manner structurally at the installation access. 
     In order to prevent the risk of contamination of the clean room and the sterile room in an equally highly satisfactory manner, it is particularly advantageous for a clean room working air pressure to be higher than a sterile room working air pressure of the installation supply and for the sterile room working air pressure to be higher than the atmosphere air pressure. As a result, it is possible on the one hand to reduce the risk of an air exchange from the sterile room into the clean room being able to take place. On the other hand, an air exchange from the environment outside the stretch blow moulding machine into the sterile room can thus be satisfactorily prevented. 
     In this respect an installation access with an advantageous two-stage compressed-air barrier is provided in the present case. Solely as a result of this, a blow moulding machine with a clean room, in particular a stretch blow moulding machine, can be advantageously further developed even without the other features of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages, aims and properties of the present invention are explained with reference to the accompanying drawing and the following description, in which a beverage container treatment plant with a stretch blow moulding machine comprising at least one installation access according to the invention is illustrated and described by way of example. In the drawing 
         FIG. 1  is a diagrammatic view of a stretch blow moulding machine of a beverage container treatment plant with at least one installation access comprising a sterile room; 
         FIG. 2  is a diagrammatic view of the entire beverage container treatment plant as shown in  FIG. 1 , and 
         FIG. 3  is a diagrammatic view of an aeration plant of the beverage treatment plant as shown in  FIGS. 1 and 2 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The beverage container treatment plant  1  as shown in  FIGS. 1 to 3  (see in particular  FIG. 2 ) essentially comprises a beverage container production unit  2  and a beverage filling unit  3 , the beverage container production unit  2  being characterized mainly by a blow moulding machine which in this embodiment is designed in the form of a stretch blow moulding machine  4  for shaping plastics material pre-forms  5  into plastics material beverage bottles  6 , and a heating apparatus  7  arranged upstream and the beverage filling unit  3  by a beverage filling machine  8  for filling the plastics material beverage bottles  6  produced and by a closure machine  9  for closing the filled plastics material beverage bottles  6 . 
     In addition, the beverage container treatment plant  1  also has a central sterilization apparatus  10  (see in particular  FIG. 2 ) and a central aeration apparatus  11  (see in particular  FIG. 3 ) for filtering untreated air and for supplying the beverage container treatment plant  1  with sterile clean air. 
     The stretch blow moulding machine  4  shown in greater detail in  FIG. 1  has a clean room  15  which overlaps the beverage container treatment plant  1  and which formulates a sterilizable clean room region  17  of the beverage container treatment line  1  by means of a clean room wall  16 . 
     The stretch blow moulding machine  4  has at the side towards the inlet  18  a plastics material pre-form supply  19  with a sterilization wheel  20  for the plastics material pre-forms  5  and with a first transfer wheel  21 , by means of which the plastics material pre-forms  5  are individually transferred in succession in each case to a blow mould carrier  22  of a blow moulding station  23  on a blow moulding wheel  24  with a direction of rotation  25 . 
     Each of the blow mould carriers  22  comprises a first blow mould carrier half  26  and a second blow mould carrier half  27  on which a first blow mould half  28  and a second blow mould half  29  of a blow mould  30  are held. The blow mould carrier halves  28  and  29  can thus be opened and closed in a known manner. 
     At the side towards the outlet  31  the stretch blow moulding machine  4  has a plastics material beverage bottle removal means  32  with a second transfer wheel  33  and a third transfer wheel  34 , by means of which the finished blow moulded plastics material beverage bottles  6  are removed out of the blow moulding stations  23  on the one hand and are removed from the stretch blow moulding machine  4  on the other hand. 
     On the stretch blow moulding machine  4  the plastics material pre-forms  5  are transferred to the sterilization wheel  20  in the supply transportation direction  35 . After the sterilization of the plastics material pre-forms  5  and the equipping of the individual blow moulding stations  23  the plastics material pre-forms  5  are expanded in the individual blow moulds  30  by means of process air to form the plastics material beverage bottles  6 , before they are finally supplied to the beverage filling unit  3  in the removal transportation direction at the side towards the outlet  31  on the stretch blow moulding machine  4  for further use. 
     In a servicing area  38  of the stretch blow moulding machine  4  a servicing intervention  39  for manual engagement in the clean room  15  with respect to maintenance or an error correction or the like is provided on the clean room wall  16 . 
     In addition, the stretch blow moulding machine  4  is provided with an installation access  40 , by way of which the blow moulding stations  23  can be equipped with different blow moulds  30 . According to the invention the installation access  40  comprises a sterile room  41  which is positioned in front of the clean room  15  on the side towards the environment  42 . 
     In this case the sterile room  41  is enclosed by a housing  43 , the housing  43  being attached in a releasable manner in this embodiment to the clean room wall  16  by means of a closure device  45  comprising sealing means  44 . 
     In particular, by means of the present installation access  40  which comprises the sterile room  41 , it is possible in an advantageous manner to keep—in addition to a first blow mould set  46  comprising the blow moulds  30  inside the clean room  15 —a further, already sterile blow mould set  47  comprising other blow moulds  48  outside the clean room  15  on the stretch blow moulding machine  4  under sterile conditions, so that switching the stretch blow moulding machine  4  over to another type of plastic material beverage bottle can be carried out more rapidly than hitherto. 
     In order to keep the further blow mould set  47  the installation access  40  comprises a rotatable blow mould holding device  49  which can be moved inside the sterile room  41  in accordance with the movement directions of the arrow  50 . 
     In addition, the installation access  40  has an environment lock  51  for access to the sterile room  41  from the side towards the environment  42  on the one hand and an exchange lock  52  for separating the blow moulds  30 ,  48  into or out of the clean room  15  on the other hand. 
     The environment lock  51  has an equipping opening  53  with an environment lock door  54 . An operator  55  can introduce or remove the blow moulds  30  and  48  respectively into the sterile room  41  by way of the equipping opening  53 . A mobile blow mould magazine (not shown here) can optionally be attached to the equipping opening  53  in order further to facilitate an exchange of the blow moulds  30  and  48  respectively. 
     In this embodiment the exchange lock  52  has only a single exchange lock door  56 , by means of which the sterile room  41  can be separated hermetically from the clean room  15 . Two exchange lock doors of this type are advantageous when the installation access  40  is temporarily removed from the clean room wall  16 , so that both the sterile room  41  and the clean room  15  are closed. 
     In addition, the installation access  40  comprises an automated transfer device  57  of hygienic design for the transfer of the blow moulds  30  and  48  respectively between the sterile room  41  and the clean room  15 . To this end the automated transfer device  57  has a gripper  58  for treating the individual blow moulds  30  and  48  respectively. The gripper  58  is mounted in the installation access  40  so as to be pivotable along the pivoting directions  59 . 
     In the event of a change of the blow moulds the exchange lock door  56  is opened. That blow mould carrier  22  of the corresponding blow moulding station  23  which is directly opposite the exchange lock  52  is also opened. The movable exchange lock door  56  and the blow mould carrier  22  are advantageously actuated in an automated manner. A manual operation is also possible, however, which can be carried out for example by way of the servicing intervention  39 . When the exchange lock door  56  is opened the transfer device  57  of hygienic design changes the sets  46  and  47  of blow moulds. 
     In general the gripper  58  and the exchange lock  52  can also be used to bring articles into the clean room  15  or to remove for example defectively formed plastics material beverage bottles  6  from the clean room  15 . 
     The installation access  40  can also be present more than once in an identical or similar design in particular in the region of the blow moulding wheel  24 . Depending upon the size of the plant or machines and the requirement the arrangement the setting and position can be selected in an advantageous manner. 
     A sterile gas supply  60  with at least one cleaning nozzle  61  is additionally provided in order to sterilize the individual blow moulds  48  inside the installation access  40 . In this case each of the blow moulds  48  arranged in the sterile room  41  can be temporarily parked in front of the cleaning nozzle  61  and cleaned. 
     It is preferable for the clean room  15  to be sterilized with a tempered gas mixture of H 2 O 2  and air. Cleaning is not absolutely necessary before each sterilization. 
     It is also advantageous for the installation access  40  to be sterilized with gas. This is necessary if for example a non-sterile set of blow moulds  48  is introduced into the sterile room  41  by the operator  55 . In this way, the blow moulds  48  can be installed during the production of the plastics material beverage bottles  6  and can respectively be cleaned and sterilized by means of one or more cleaning nozzles  61 . In this case it is advantageous for the various blow moulds  48  to be positioned at a distance A, in order to wet all the surfaces satisfactorily. 
     As may be seen particularly clearly from the illustration of  FIG. 2 , the beverage container treatment plant  1  is divided into a region  65  which is capable of being sterilized and a region  66  which is capable of being cleaned and sterilized. 
     The region  65  capable of being sterilized starts after the sterilization of the plastics material pre-forms  5  on the sterilization wheel  20  and ends at a transfer unit  67  between the stretch blow moulding machine  4  and the beverage filling machine  8  of the beverage filling unit  3 . 
     The region  66  capable of being cleaned and sterilized starts immediately after the region  65  capable of being sterilized and ends after the application of closures to the plastics material beverage bottles  6  on the closure machine  9  with a closure sterilization unit  70  for closures  70 A. In particular, it is advantageous for the other blow moulds  48  to be cleaned in an automated manner in the installation access  40 . It is preferable for the beverage container treatment plant  1  as a whole to be dry-sterilized. 
     In addition, the beverage container treatment plant  1  comprises a furnace  71  associated with the heating device  7  for heating the plastics material pre-forms  5  and an additional plastics material beverage bottle lock  72 . 
     During the production an evaporator  75  known per se supplies the sterilization wheel  20  of the plastics material pre-forms  5  and/or the closure sterilization unit  70 . In order to produce a multiplicity of necessary quantities for different operating states of H 2 O 2  air mixture, the evaporator  75  is supplied from an annular H 2 O 2  line  78  by way of two or more paths  76  and  77 . 
     The air supply can come either from the environment  42  and/or from an aeration system  80  with a filter  80 A and  81  respectively (see  FIGS. 1 and 3 ) of the beverage container treatment plant  1  and/or from the waste air appliance  82  of the furnace  71 . Absolute security with respect to purity is provided by a cartridge filter element  83  in the supply line of the incoming air. 
     The annular H 2 O 2  line  78  can have further consumer means  84  in order to supply further units of the beverage container treatment plant  1 . By way of example, hydraulic sealing systems can be supplied together with a water connection  85 . 
     Since the evaporator  75  should not be adversely affected during the production, it is advantageous for the further set of blow moulds  47  to be capable of being sterilized by way of a further evaporator  86 , since this process should be planned for a time during the production. 
     Furthermore, the additional plastics material beverage bottle lock  72  can also be sterilized at least for a time by means of the second evaporator  86  by way of a line. 
     By way of example, defective plastics material beverage bottles  6  or sample containers (not shown here) can be removed by way of the additional plastics material beverage bottle lock  72  from the current process or disposed of by way of a transfer wheel  73 . After the production the region  66  capable of being cleaned and sterilized is preferably cleaned in an automatic manner with caustic solution by way of one or more injection nozzles and/or rotation heads (not shown here) and then rinsed with water, preferably of the quality of drinking water. 
     After that, the region  66  capable of being cleaned and sterilized should be additionally dried. The beverage container treatment plant  1  can then be put into a state of rest. 
     The various components of the beverage container treatment plant  1  have to be sterilized before the next production. To this end they have to be heated. It is advantageous for tempered air  90  to be fed into a pipe line system  91 . 
     After that, the beverage container treatment plant  1  is dry-sterilized, preferably with H 2 O 2 . The two evaporators  75  and  86  can feed into the pipe line system  91  and, in this way, can accelerate the process. In addition, H 2 O 2  can also be branched off from the pipe line system  91  at a connection  92 , in order for example to sterilize the first aeration system  80  and/or a further pipe line system, such as for example a nozzle system for cleaning the beverage container treatment plant  1  and/or also units extraneous to the plant. 
     The clean room  15  and the sterile room  41  are acted upon with filtered air, so as to ensure an over-pressure with respect to the surrounding atmosphere. In the present case the over-pressure is monitored by a control means (not shown here) of the machine by means of one or more pressure sensors  100  and  101 . 
     A particularly successful production of plastics material beverage bottles is ensured for example by the following pressure ratio: p 1 &gt;p 2 &gt;p at  in which in the present case p 1  is the working air pressure  102  of the clean room, p 2  is the working pressure  103  of the sterile room and p at  is the air pressure  104  of the atmosphere. In order to be able to reduce the risk of contamination by germs still further, in particular in the region of the stretch blow moulding machine  4 , the working air pressure  102  of the clean room is set higher than the sterile room working air pressure  103  of the installation supply  40  and the sterile room working air pressure  103  is set higher than the atmosphere air pressure  104 . 
     It is advantageous for sterile incoming air to be prepared by way of a central aeration system  80  and  81  respectively and to be supplied to the various portions of the clean room by way of pipe lines. The control of the air flows is carried out as a rule by poppet valves or flap valves  105  (numbered only by way of example). 
     An air extraction system is where appropriate also necessary with respect to the second aeration system  81  if a directed flow is desired. Part of the air can also be moved in a circuit  106 . The aeration system can also supply other clean rooms of machines, such as the beverage filling machine  8 , the closure machine  9  or on the other hand even plants set up in parallel (not shown here). In general it is advantageous for the process technology to be combined with other machines of the container treatment. The aeration system  80  can also be sterilized from the rear side. 
     In particular, the illustration according to  FIG. 3  clearly shows in a diagrammatic manner the mode of operation of the aeration technology of the present beverage container treatment plant  1  which is divided into non-sterile regions  110  and  111 , into a sterilization region  112  for the sterilization of the plastics material pre-forms  5  and into a sterile region  113 . The sterile region  113  starts during the sterilization of the plastics material pre-forms  5  and ends after the closure is applied to the respective plastics material beverage containers  6 . This entire region has to be kept under over-pressure during the production. 
     In addition, there are also regions  65  and  66  which bound the filling region of the present stretch blow moulding machine  4 . 
     It is preferable for suction to take place on the transfer unit  67  which constitutes a lock system, so that during the production no aerosols from the filling process reach the region  65  capable of being sterilized. In addition, an air supply means  114  can be attached to the transfer unit  67 , so that an over-pressure can always be maintained with respect to the atmosphere. In the entire sterile region  113  the over-pressure should not drop below 5 pascal. 
     A lock system in the form of the plastics material pre-form supply means  19  is likewise installed on the supply side of the plastics material pre-forms  5 . Since, in particular, a hot H 2 O 2 /air mixture is supplied for the sterilization of the plastics material pre-forms  5  on the sterilization wheel  20 , it is necessary to have the same pressure level (p 1 ≈p 8 ≈p 7 &gt;p at ) on both sides. That is provided by a second air supply  115  on the one hand and by a third air supply  116  on the other hand. In which case a major part of the volume flow of the second air supply  115  is drawn away by way of the air outlet  117 . 
     An air lock  118  must likewise be present on the outlet side in order to have a clear separation between the sterile region  113  and the first non-sterile region  110 . 
     During the sterilization of the beverage container treatment plant  1  a hot H 2 O 2  air mixture is preferably used, as already mentioned. For this purpose, the outlet  118  is closed at least in part by a flap  119 . 
     Concerning the introduction of articles during an interruption of production, for the sake of flexibility of the plant it is advisable for parts dependent upon the format, such as for example blow moulds  30  or  48 , to be introduced into the sterile zone of the clean room  15 , in particular into the stretch blow moulding machine  4 , by way of an installation access  40 . 
     In order to introduce the blow moulds  48  the environment lock door  54  must be opened, as a result of which the installation access  40  is non-sterile. After the closure of the environment lock door  54  the blow moulds  48  in the sterile room  41  of the installation access  40  are preferably sterilized with the H 2 O 2  air mixture by way of an H 2 O 2  air mixture supply means  120 . Starting from the H 2 O 2  air mixture supply means  120  it is also optionally possible for a plastics material pre-form sterilization or even the filters of the aeration system  80  (see  FIG. 1 ) to be sterilized. After the sterilization of the blow moulds  48  the sterile room should be rinsed with filtered air from the aeration system  80 . To this end an air outlet  121  is also necessary. Before the outlet lock door  56  is opened, the pressure between the clean room  15  and the sterile room  41  must be brought to the same level (p 1 ≈p 2 ). The new blow moulds  48  can then be introduced into the clean room  15  and existing blow moulds  30  should be removed from the clean room  15 , without the sterility being adversely affected. During the production it is necessary for the following pressure states always to be provided: p 1 , p 3 , p 4 &gt;p at . 
     It is to be understood that the embodiment explained above is only a first design of the stretch blow moulding machine  4  according to the invention. In this respect the design of the invention is not restricted to this embodiment. 
     The Applicants reserve the right to claim all the features disclosed in the application documents as being essential to the invention, insofar as they are novel either individually or in combination as compared with the prior art. 
     LIST OF REFERENCES 
     
         
           1  beverage container treatment plant 
           2  beverage container production unit 
           3  beverage filling unit 
           4  stretch blow moulding machine 
           5  plastics material pre-forms 
           6  plastics material beverage bottles 
           7  heating apparatus 
           8  beverage filling machine 
           9  closure machine 
           10  sterilization apparatus 
           11  aeration apparatus 
           15  clean room 
           16  clean room wall 
           17  clean room region 
           18  inlet side 
           19  plastics material pre-form supply 
           20  sterilization wheel 
           21  first transfer wheel 
           22  blow mould carrier 
           23  blow moulding station 
           24  blow moulding wheel 
           25  direction of rotation 
           26  first blow mould carrier half 
           27  second blow mould carrier half 
           28  first blow mould half 
           29  second blow mould half 
           30  blow mould 
           31  outlet side 
           32  plastics material beverage bottle removal means 
           33  second transfer wheel 
           34  third transfer wheel 
           35  supply transport direction 
           37  removal transport direction 
           38  servicing area 
           39  servicing intervention 
           40  installation access 
           41  sterile room 
           42  environment side 
           43  housing 
           44  sealing means 
           45  closure device 
           46  first set of blow moulds 
           47  further set of blow moulds 
           48  other blow moulds 
           48 A first blow mould half 
           49  rotatable blow mould holding device 
           50  arrow 
           51  environment lock 
           52  exchange lock 
           53  equipping opening 
           54  environment lock door 
           55  operator 
           56  exchange lock door 
           57  transfer device 
           58  gripper 
           59  pivoting directions 
           60  sterile gas supply 
           61  cleaning nozzle 
           65  region capable of being sterilized 
           66  region capable of being cleaned and sterilized 
           67  transfer unit 
           70  closure sterilization unit 
           70 A closures 
           71  furnace 
           72  plastics material beverage bottle lock 
           73  transfer wheel 
           75  evaporator 
           76  first path 
           77  second path 
           78  annular H 2 O 2  line 
           80  first aeration system 
           80 A filter 
           81  second aeration system 
           82  waste air appliance 
           83  cartridge filter element 
           84  further consumer means 
           85  water connection 
           86  further evaporator 
           90  tempered air 
           91  pipe line system 
           92  connection 
           100  first pressure sensor 
           101  second pressure sensor 
           102  clean room working pressure 
           103  sterile room working pressure 
           104  atmosphere air pressure 
           105  poppet valves and flap valves 
           106  circuit 
           110  first non-sterile region 
           111  second non-sterile region 
           112  sterilization region 
           113  sterile region 
           114  first air supply means 
           115  second air supply means 
           116  third air supply means 
           117  air outlet 
           118  air lock 
           119  flap 
           120  H 2 O 2  air mixture supply 
           121  air outlet 
         A distance