DE10212896A1 - Thermoplastic container blow molding process involves movement of blowing tool halves in opposite directions along the transport path while the tool halves are opened and closed - Google Patents

Abstract

Blowing tool halves(5,6) on tool carriers containing preforms move to a blowing station(3) which moves along part of a transporting path in the transporting direction(31) and then moves in the opposite direction. During these movements the blowing tool halves move relative to each other in opening and closing movements. Movement of the preform and container transporting chain or belt(29) is intermittent. The blowing station has two or more cavities for simultaneous inflation of preforms to form containers. Movement of tool halves(5,6) in both the transporting direction and in the opening and closing directions is produced by a common drive mechanism. The duration of tool opening and closing movements is similar to that for the movement of inflated containers out of the blowing station and preforms into the blowing station. Compressed air inflation of preforms occurs when the blow molding station(3) is stationary. An Independent claim is made for the process equipment whose blow molding station moves along the preform and container transporting path and is connected to a drive unit so that a movement along the transporting path overlaps a movement transverse to the latter.

Description

The invention relates to a method for blow molding Containers in which preforms made of a thermoplastic Material tempered and then within one Blow molding by the action of a pressurized Medium to be formed into containers and in which the at least two blow mold segments consisting of Mold carriers of a blowing station is positioned as well as at first the preforms and then the containers along a transport route in a transport direction be positioned.

The invention also relates to a device for Blow molding of containers containing at least one blow molding station for forming thermoplastic preforms in the Contains and in which the blowing station with at least two supported by mold carriers Blow mold segments is provided as well as for the Preforms and the containers provided a transport route is.

With such a container formation Blast pressure effects are preforms from one thermoplastic material, for example preforms PET (polyethylene terephthalate), inside a blow molding machine fed to different processing stations. Such a blow molding machine typically has one Heating device and a blowing device, in whose Area of pre-tempered preform by biaxial Orientation to a container is expanded. The Expansion takes place with the help of compressed air, which in the too expanding preform is initiated. The procedural sequence in such an expansion the preform is explained in DE-OS 43 40 291.

The basic structure of a blowing station for Container shaping is described in DE-OS 42 12 583. Options for tempering the preforms are given in DE-OS 23 52 926 explained. A fixed position Blow station is disclosed in DE-OS 198 07 582.

Within the blow molding device, the Preforms as well as the blown containers with the help different handling devices transported become. The use of Transport mandrels on which the preforms are attached become. The preforms can also be used with others Carriers are handled. The use of Gripping pliers for handling preforms and the Use of expanding mandrels to hold in one Mouth area of the preform are insertable include also to the available constructions.

The handling of the preforms is already explained on the one hand in the so-called two-stage process, in which the preforms first in an injection molding process manufactured, then temporarily stored and only later conditioned in terms of temperature and one Containers are inflated. On the other hand there is one Use in the so-called one-step process, in which the preforms immediately after their injection molding manufacturing and sufficient Solidification suitably tempered and then be inflated.

With regard to the blowing stations used different embodiments are known. at Blow stations on rotating transport wheels are arranged is a book-like opening of the Mold carriers are common. But it is also possible relatively displaceable or differently guided Insert mold carrier. For fixed blowing stations, the are particularly suitable for several cavities Include container shaping and usually one cyclical material transport is provided typically arranged parallel to each other as Mold carrier used.

With clocked blow molding machines there is a typical one Production process in such a way that the stationary Blowing stations clocked the preforms are fed, that are to be formed into the containers. The Blow stations are first opened to Remove blown containers from the cavities and new ones Position preforms in the area of the cavities can. After the blowing stations have been closed, a Compressed air pressure on the preforms and the containers are generated. The actual process time for the Forming the preforms in the container typically in the range of 1.5 seconds to 2 seconds, the time for the blowing station to open and close as well as the removal of the blown containers and the Feeding of the preforms is typically between 1 Second and 1.5 seconds. Overall this results a cycle time in the range of 3 seconds. The Process idle times are therefore with the cycle machines insignificantly below the actual process time.

The object of the present invention is a method of the type mentioned in the introduction to improve such that same cycle time a reduced cycle time is reached can be.

This object is achieved in that the Blow station along a section of the transport route performing a motion component in Transport direction is positioned and that during at least part of the implementation of this Movement component positioning the Blow mold segments is performed relative to each other.

Another object of the present invention is a Device of the type mentioned in the introduction construct that increased production capacity provided.

This object is achieved in that the Blow station along part of the transport route is movably mounted and that the blowing station with at least one drive device is coupled, that a running along the transport route Movement range of the blowing station overlaps to a cross Movement area of the transport route Blow station is arranged.

By arranging and positioning the blowing station such that mobility along the transport route is given, it is possible to significantly shorten the To achieve process idle times. In particular it is possible at the beginning of the opening movement of the Blow station together with the blown container or containers the blowing station in the intended transport direction move. After opening the blowing station sufficiently such that the blown containers are released the blowing station moves against the transport direction, while at the same time transporting the blown containers and the transport of the subsequent preforms is continued.

After completing the positioning of the blowing station contrary to the transport direction of the preforms, the begins Closing movement of the blowing station and the blowing station will together with the next preforms to be inflated in the final positioning to carry out the blowing process brought. Due to the temporal overlay of the opening and closing movements of the blowing stations with the It is the transport movement of the containers or the preforms possible, a reduction in process idle times by about 50% to reach. As a result, the total cycle time can be reduced by approximately 20% to 25% can be reduced, which increases performance in the same order of magnitude.

The proposed construction unites the respective Advantages of fixed blowing stations as well as Blow stations arranged on rotating blowing wheels are.

A typical material transport takes place in that the Movement of the transport device in cycles Movement phases and rest phases is carried out.

In particular, it is thought that within the Blow station at least two preforms at the same time Containers are formed.

To support a reproducible implementation of the Movements with simple drive construction it is proposed that a common drive for the Carrying out the movement of the blow mold segments in Direction of transport and transverse to the direction of transport is used.

This enables advantageous time coordination occur that an opening movement and a subsequent closing movement of the blow mold segments approximately for the duration of a period of time to be carried out Duration of transport of the blown containers from the Blow station out and the preforms into the blow station into it.

To further simplify the drive concept at the same time it carries optimal movement synchronization at that the blow mold segments and the transport device be positioned by a common drive.

A particularly high reproducibility with the Movement can be achieved in that the Positioning movement of the blow mold segments mechanically a positioning movement of the transport device is coupled.

Continuous implementation of the necessary Movements are supported by the fact that a mechanical Coupling the movements of the blow mold segments and the Transport device at least in part through use performed at least one rotating drive roller will be positioned by the swivel bearing.

Another variant of the method is that a Positioning of the blow mold segments at least in part performed using an electric drive becomes.

To facilitate a supply of resources suggested that the blow molding of the preforms in Containers within a working phase with immobile Blow station is performed.

In particular, it proves advantageous that the Blow station in an immobile operating state with Compressed air to expand the preforms into containers is supplied.

A specification of the movements to be carried out via rotating drive rollers is supported in that the Coupling of motion at least in part by a mechanical eccentric coupling is realized.

In particular contributes to a parallel to each other Positioning the mold carrier at that the mechanical Coupling for each mold carrier at least two Has drive rollers with swivel bearings, the parallelogram-like with the assigned shape carriers are coupled.

An inexpensive, resilient and flexible Drive concept is provided in that a Drive for the transport device at least one Deflection wheel and at least one flexible connecting element having.

It also contributes to an inexpensive and at the same time resilient realization that a drive for the Positioning movement of the blowing station at least one Deflection roller and at least one flexible coupling.

A simple movement coupling can be done in that a positioning device for the blowing station over a Lever arrangement coupled to an associated drive is.

An optimal coordination of a movement of the Transport device with a movement of the Blow mold segments with simple constructive at the same time Structure is achieved in that the lever arrangement has at least two levers, their respective axes of rotation are offset relative to each other.

A realization of the proposed motion profiles will also supported by the fact that the levers are engaged of a pin coupled together in a longitudinal recess are.

An inexpensive basic structure is supported by the fact that the horizontal bar is immovable in the direction of the transport path is arranged.

It also contributes to an inexpensive construction and one functionally reliable over a long period of time Operating mode in that the connecting piston in the direction of Transport path is immovably arranged.

A simple coordination of the movement of the Blow mold halves and the positioning of a bottom part is supported by the fact that the lifting device for the Bottom part together with the mold halves in the direction of the Transport path movable and across the transport path is immovably arranged.

Exemplary embodiments of the invention are shown in the drawings shown schematically. Show it:

Fig. 1 is a representation of a blowing station for producing containers from preforms, which is provided with a positioning device for blow-mold parts and a stretching device,

Fig. 2 is a longitudinal section through a blow mold in which a parison is stretched and expanded,

Fig. 3 is a sketch that illustrates a basic structure of an apparatus for blow molding containers,

Fig. 4 is a side view of a blowing station with positionable bottom mold in an open state,

Fig. 5, the blow molding station shown in FIG. 4, in a closed condition

Fig. 6 is an enlarged partial view of the device according to Fig. 3, in a vicinity of the blowing station

Fig. 7 is a plan view of the blow station of FIG. 6 in an open state,

Fig. 8 shows a cross section according to section line VIII-VIII in Fig. 7,

Fig. 9 is a schematic representation of a blowing station with two cavities immediately after blow molding the preforms into containers,

Fig. 10, the blow molding station shown in FIG. 9 after a partial implementation of an opening movement and a partial carry out a positioning of the blowing station in the transport direction of the blown container,

Fig. 11, the blow molding station shown in FIG. 10 in a sufficiently open for release of the container condition and at a maximum positioning of the blowing station in the transport direction,

Fig. 12, the blow molding station shown in Fig. 11 after partial execution of a movement opposite to the transport direction of the containers,

Fig. 13, the blow molding station shown in FIG. 12 by a continuation of the backward movement, at a positioning of the blowing station is in a range as shown in FIG. 9

Fig. 14, the blow molding station shown in FIG. 13, according to a continuation of the backward movement

Fig. 15, the blow molding station shown in FIG. 14, after completion of the backward movement contrary to the transport direction as well as in a partially already again closed state,

FIG. 16 shows the blowing station according to FIG. 15 in an almost closed state and shortly before reaching the basic position and

FIG. 17 shows the blowing station according to FIG. 16 in a position corresponding to FIG. 9 and immediately before the preforms begin to be blown into the containers.

The basic structure of a device for shaping preforms ( 1 ) into containers ( 2 ) is shown in FIG. 1 and in FIG. 2.

The apparatus for molding the container (2) consists essentially of a blowing station (3), which is provided with a blow mold (4), in which a preform (1) is insertable. The preform ( 1 ) can be an injection molded part made of polyethylene terephthalate. In order to enable the preform ( 1 ) to be inserted into the blow mold ( 4 ) and to enable the finished container ( 2 ) to be removed, the blow mold ( 4 ) consists of mold halves ( 5 , 6 ) and a base part ( 7 ) which is lifted ( 8 ) can be positioned. The preform ( 1 ) can be held in the area of the blowing station ( 3 ) by a transport mandrel ( 9 ) which, together with the preform ( 1 ), passes through a plurality of treatment stations within the device. However, it is also possible to insert the preform ( 1 ) directly into the blow mold ( 4 ), for example using pliers or other handling means.

To enable a compressed air supply line, a connecting piston ( 10 ) is arranged below the transport mandrel ( 9 ), which supplies compressed air to the preform ( 1 ) and at the same time seals against the transport mandrel ( 9 ). In the case of a modified construction, it is in principle also conceivable to use fixed compressed air supply lines.

The preform ( 1 ) is stretched using a stretching rod ( 11 ), which is positioned by a cylinder ( 12 ). In principle, however, it is also conceivable to carry out mechanical positioning of the stretching rod ( 11 ) or positioning using servomotors.

In the embodiment shown in Fig. 1, the stretching system is designed such that a tandem arrangement of two cylinders ( 12 ) is provided. The stretching rod ( 11 ) is first moved from a primary cylinder ( 13 ) to the area of a bottom ( 14 ) of the preform ( 1 ) before the actual stretching process begins. During the actual stretching process, the primary cylinder ( 13 ) with extended stretching rod is positioned by a secondary cylinder ( 16 ) together with a carriage ( 15 ) carrying the primary cylinder ( 13 ). In principle, however, it is also possible to change the sequence of actuation of the two cylinders ( 13 , 16 ).

After the mold halves in the area of supports (19, 20) arranged in mold halves (5, 6) are closed, the carrier (19, 20) relative to each other by means of a locking device or by a Zuhaltkraft of the positioning system for the mold carriers (19, 20) ,

To adapt to different shapes of a mouth section ( 21 ) of the preform ( 1 ), the use of separate thread inserts ( 22 ) in the area of the blow mold ( 4 ) is provided according to FIG. 2. In addition to the blown container ( 2 ), FIG. 2 also shows the preform ( 1 ) and the developing container bladder ( 23 ).

Different thermoplastic materials can be used Plastics are used. Are operational for example PET, PEN or PP.

The preform ( 1 ) expands during the orientation process by supplying compressed air. The compressed air supply is divided into a pre-blowing phase, in which gas, for example compressed air, is supplied at a low pressure level and into a subsequent main blowing phase, in which gas is supplied at a higher pressure level. Compressed air with a pressure in the interval from 10 bar to 25 bar is typically used during the pre-blowing phase and compressed air with a pressure in the interval from 25 bar to 40 bar is fed in during the main blowing phase.

Fig. 3 shows the basic structure of a blow molding machine, which is provided with a heating section ( 24 ) and a blowing station ( 3 ). The blowing station ( 3 ) is equipped with a blow mold ( 4 ) which has two cavities ( 25 , 26 ) for the simultaneous production of two containers ( 2 ). In principle, however, a plurality of blowing stations ( 3 ) can also be used and / or different numbers of cavities ( 25 , 26 ) can be provided.

Starting from a preform input ( 27 ), the preforms ( 1 ) are positioned by a transfer device ( 28 ) in the region of a rotating transport device ( 29 ). In the exemplary embodiment shown, the preform input ( 27 ) is designed as a feed rail, along which the preforms ( 1 ) are moved with their mouth sections ( 21 ) oriented upwards in the vertical direction. The transfer device ( 28 ) turns the preforms ( 1 ) through 180 ° and places the preforms ( 1 ) with their mouth sections ( 21 ) oriented vertically downward in the region of the transport device ( 29 ). In the exemplary embodiment shown, the transport device ( 29 ) is designed as a transport chain which holds a plurality of transport mandrels ( 9 ) on which the preforms ( 1 ) are placed. The transport device ( 29 ) spans an essentially rectangular transport path ( 30 ), along which the preforms ( 1 ) and then the blown containers ( 2 ) are first moved in a transport direction ( 31 ). The transport path ( 30 ) is spanned by four deflection wheels ( 32 , 33 , 34 , 35 ).

Heating devices ( 36 ) are arranged in the area of the heating section ( 24 ). The heating devices ( 36 ) can be implemented, for example, as infrared emitters. In addition, fans ( 37 ) are arranged in the area of the heating section ( 24 ) in order to prevent overheating of surfaces of the preforms ( 1 ). It can be seen from the illustration in FIG. 3 that a spacing of the preforms ( 1 ) in the area of the transfer device ( 28 ) and in the area of the blowing station ( 3 ) is greater than in the area of the heating section ( 24 ). This has the advantage that the preforms ( 1 ) can be guided past the heating devices ( 36 ) at short distances relative to one another and that a high degree of heating efficiency is thereby achieved.

In terms of device technology, the change in the spacing of the preforms ( 1 ) in the exemplary embodiment shown is realized by a construction of the transport device ( 29 ) as an expansion chain. Individual chain elements ( 38 ) are pivotally connected to one another in the region of the transport mandrels ( 9 ) and in the region of intermediate joints ( 39 ), so that the transport chain can be folded up by pivoting the chain elements ( 38 ). In the illustrated embodiment, all deflection wheels ( 32 , 33 , 34 , 35 ) are driven. This can be done, for example, by coupling using a connecting element ( 40 ), which can be realized from one or more chains or toothed belts. In the exemplary embodiment shown, the connecting element ( 40 ) is implemented by three sub-elements.

After being removed from the blowing station ( 3 ), the blown containers are positioned by a transfer device ( 41 ) in the region of an output section ( 42 ). The output section ( 42 ) can be implemented, for example, as an air conveyor section, along which the containers ( 2 ) are transported by a blower ( 43 ). The transfer device ( 41 ) is designed as a turning device which rotates the containers ( 2 ) by 180 °, so that transport along the output section ( 42 ) with the mouth sections ( 21 ) takes place in the vertical direction upwards.

Fig. 4 shows a side view of the blowing station ( 3 ) in an open state. It can be seen that the mold halves ( 5 , 6 ) are held by mold carriers ( 44 , 45 ) which are connected to eccentric elements ( 48 , 49 ) via pivot bearings ( 46 , 47 ). The eccentric elements ( 48 , 49 ) are connected to base supports ( 52 , 53 ) via swivel bearings ( 50 , 51 ). Drive shafts ( 54 , 55 ) connected to the eccentric elements ( 48 , 49 ), which carry drive rollers ( 56 , 57 ), protrude through the pivot bearings ( 50 , 51 ).

FIG. 5 shows the blowing station ( 3 ) according to FIG. 4 in a closed state. The bottom part ( 7 ) was lowered and the mold halves ( 5 , 6 ) were moved towards each other. In the illustrated embodiment, the lowering of the base part ( 7 ) takes place by a transverse displacement of the lifting device ( 8 ). A cam roller ( 58 ) of the base part ( 7 ) slides along a control cam ( 59 ) and carries out the positioning of the base part ( 7 ). The blowing station ( 3 ) is closed by pivoting the mold carriers ( 44 , 45 ) around the pivot bearings ( 46 , 47 , 50 , 51 ). To support the execution of reproducible movements of the mold carriers ( 44 , 45 ), the base carriers ( 52 , 53 ) are connected to one another by a frame ( 60 ). To support tensioning of the mold halves ( 5 , 6 ) relative to one another, a prestressing unit ( 61 ) is arranged between the mold half ( 6 ) and the mold carrier ( 45 ), which can be designed, for example, as a pneumatically clampable pressure element.

FIG. 6 shows the blowing station ( 3 ) according to FIG. 3 in an enlarged view. The blowing station ( 3 ) is closed in the operating state shown. It can be seen in particular that two eccentric elements ( 48 , 49 ) are assigned to each of the mold carriers ( 44 , 45 ). When the eccentric elements ( 48 , 49 ) are pivoted about the assigned axes of rotation, the mold carriers ( 44 , 45 ) are adjusted in the manner of a parallelogram. This ensures that the mold carriers ( 44 , 45 ) are aligned parallel to one another in each pivoting state.

Fig. 6 also illustrates that in the region of the deflection wheel ( 33 ) the transport device ( 49 ) is deployed after the passage through the heating section ( 24 ) has been completed. In the area of the blowing station ( 3 ), the transport mandrels ( 9 ) have their maximum distance relative to one another in order to feed the preforms ( 1 ) to the cavities ( 25 , 26 ) with the intended distance between the longitudinal axes of the preforms ( 1 ) enable.

FIG. 7 shows the blowing station ( 3 ) according to FIG. 6 in a partially opened state. In a departure from a conventional intended mode of operation, only the left mold carrier ( 44 ) was positioned in the opened state in the positioning shown in FIG. 7 using the eccentric elements ( 48 ). The mold carrier ( 45 ) shown on the right, however, has not yet been moved into the open position. In actual operation, however, it is provided that both mold carriers ( 44 , 45 ) are positioned simultaneously and in opposite directions.

From the cross-sectional view in Fig. 8 it can be seen that in the illustrated embodiment, two cavities ( 25 , 26 ) are arranged side by side in order to form two containers ( 2 ) at the same time. The two base parts ( 7 ) assigned to the cavities ( 25 , 26 ) are positioned by a common lifting device ( 8 ). Basically, only one cavity or more than two cavities can also be arranged in the area of the blowing station ( 3 ).

To illustrate how the mold halves ( 5 , 6 ) and the associated mold carriers ( 44 , 45 ) are positioned, a schematic illustration of the blowing station ( 3 ) is shown in FIG. 9. In the embodiment shown in FIG. 9, the transport direction ( 31 ) runs from bottom to top in the drawing plane. The deflection wheel ( 34 ) is coupled to a lever arrangement ( 63 ) via a mechanical coupling ( 62 ). The coupling ( 62 ) can be designed, for example, as a toothed belt. The lever arrangement ( 63 ) consists of two levers ( 64 , 65 ), which are each rotatably mounted about associated pivot bearings ( 66 , 67 ). The pivot bearings ( 66 , 67 ) have an axial spacing ( 68 ) relative to one another.

The coupling ( 62 ) connects the deflection wheel ( 34 ) to the swivel bearing ( 66 ) in such a way that rotation of the deflection wheel ( 34 ) also causes rotation of the lever ( 64 ) around the swivel bearing ( 66 ). The lever ( 64 ) engages with a pin ( 69 ) in a longitudinal slot ( 70 ) of the lever ( 65 ), which extends in the direction of a longitudinal axis of the lever. The pivot bearing ( 67 ) of the lever ( 65 ) is connected to one of the drive rollers ( 56 , 57 ) of the associated mold carrier ( 44 , 45 ) via a coupling ( 71 ). The coupling ( 71 ) can be designed as a toothed belt.

From Fig. 10 it can be seen that a pivoting of the lever ( 64 ) is caused by a transport movement of the deflection wheel ( 34 ) via the coupling ( 62 ). By the engagement of the pin (69) into the longitudinal slot (70) of the lever (65) and the lever (65) is rotated about its pivot (67). The rotation of the lever ( 65 ) causes the coupling ( 71 ) to move and this causes the drive roller ( 57 ) to rotate. The drive roller ( 57 ) causes the eccentric element ( 49 ) to pivot about the pivot bearing ( 51 ). This also causes the pivot bearing ( 47 ) to rotate about the pivot bearing ( 51 ). As a result of this pivoting movement, the blowing station ( 3 ) carries out both a translational movement in the transport direction ( 31 ) and a movement transverse to the transport direction ( 31 ), so that an opening movement of the mold halves ( 5 , 6 ) is brought about. Are the same direction of movement of the mold carriers (44, 45) (45, 44) transversely caused in the transport direction (31) and an opposite movement of the mold supports to the transport direction (31) via a suitable mechanical coupling.

According to the illustration in FIG. 11, the movement of the transport device ( 29 ) in the transport direction ( 31 ) is continued and this causes a further pivoting of the lever arrangement ( 63 ). Due to the mechanical couplings present, the blowing station ( 3 ) has been positioned to the maximum in the transport direction ( 31 ) and the blown containers ( 2 ) are completely released from the mold halves ( 5 , 6 ).

According to the illustration in FIG. 12, the movement of the transport device ( 29 ) in the transport direction ( 31 ) was continued and the swivel bearings ( 46 , 47 ) passed through their maximum upper positioning in the plane of the drawing and also cause the mold carriers to move back during the return movement ( 44 , 45 ) while continuing to increase the distance between the mold carriers ( 44 , 45 ).

According to the positioning state reached in FIG. 13, the pivot bearings ( 46 , 47 ) take their maximum distance transversely to the transport direction ( 31 ) and as a result the mold halves ( 5 , 6 ) are in a maximum opening state of the blowing station ( 3 ).

As a result of the further forward movement of the transport device ( 29 ) and the consequent further pivoting of the lever arrangement ( 63 ) and the drive rollers ( 56 , 57 ), the mold halves ( 5 , 6 ) were brought closer together again as shown in FIG. 14 while continuing the positioning movement of the blow mold halves ( 5 , 6 ) against the transport direction ( 31 ).

According to the representation in FIG. 15, the mold halves ( 5 , 6 ) have reached their lower position maximum in the plane of the drawing and thus their position which has been shifted furthest against the transport direction ( 31 ), and the closing movement has been continued compared to the representation in FIG. 14. According to this positioning, the blown containers ( 2 ) have already been completely removed from the area of the mold halves ( 5 , 6 ) and new preforms ( 1 ) to be formed into containers ( 2 ) are already in the area between the closing mold halves ( 5 , 6 ).

According to the illustration in FIG. 16, the closing movement of the mold halves ( 5 , 6 ) is almost complete and the preforms ( 1 ) are already positioned centrally to the central axis of the respective cavities of the blow mold ( 4 ).

According to the illustration in FIG. 17, the blowing station ( 3 ) is completely closed again and the pivot bearings ( 46 , 47 ) have assumed their maximally approximated positioning. The representation in FIG. 17 corresponds to the initial positioning in FIG. 9, so that the process cycle described is run through again.

Before the mold halves ( 5 , 6 ) are transferred again to the positioning according to FIG. 10, the transport device ( 29 ) and thus also the lever arrangement ( 63 ) coupled to it and the mold carriers ( 44 , 45 ) are at rest until the expansion the preforms ( 1 ) have been sealed into the containers ( 2 ) and the containers ( 2 ) have sufficient dimensional stability by cooling in order to be able to initiate an opening movement of the blowing station ( 3 ).

Claims (28)

1. A process for blow molding containers, in which preforms made of a thermoplastic material are tempered and then formed into containers within a blow mold by the action of a pressurized medium, and in which the blow mold consisting of at least two blow mold segments is positioned on mold carriers of a blow molding station, and at at least the preforms and then the containers are positioned along a transport path in a transport direction, characterized in that the blowing station ( 3 ) along a partial region of the transport path ( 30 ) by performing a movement component in the transport direction ( 31 ) and then with a movement component against the Transport direction ( 31 ) is positioned and that during at least part of the implementation of these movement components, the blow mold segments are positioned relative to each other. 2. Method according to claim 1, characterized in that the movement of the transport device ( 29 ) is carried out cyclically with movement phases and rest phases. 3. The method according to claim 1 or 2, characterized in that within the blowing station ( 3 ) at least two preforms ( 1 ) are simultaneously formed into containers ( 2 ). 4. The method according to any one of claims 1 to 3, characterized in that a common drive for carrying out the movement of the blow mold segments in the transport direction ( 31 ) and transversely to the transport direction ( 31 ) is used. 5. The method according to any one of claims 1 to 4, characterized in that an opening movement and a subsequent closing movement of the blow mold segments are carried out approximately for the duration of a period which is a duration of the transport of the blown container ( 2 ) out of the blow station ( 3 ) and the preforms ( 1 ) correspond to the blowing station ( 3 ). 6. The method according to any one of claims 1 to 5, characterized in that the blow mold segments and the transport device ( 29 ) are positioned by a common drive. 7. The method according to any one of claims 1 to 6, characterized in that the positioning movement of the blow mold segments is mechanically coupled with a positioning movement of the transport device ( 29 ). 8. The method according to any one of claims 1 to 7, characterized in that a mechanical coupling of the movements of the blow mold segments and the transport device ( 29 ) is carried out at least in part by using at least one rotating drive roller ( 56 , 57 ) from the pivot bearing ( 46 , 47 ) can be positioned. 9. The method according to any one of claims 1 to 8, characterized characterized in that a positioning of the Blow mold segments at least in part using a electric drive is performed. 10. The method according to any one of claims 1 to 9, characterized in that the blow molding of the preforms ( 1 ) in the container ( 2 ) is carried out within a working phase with a stationary blowing station ( 3 ). 11. The method according to any one of claims 1 to 9, characterized in that the blowing station ( 3 ) in an immobile operating state with compressed air for expanding the preforms ( 1 ) in container ( 2 ) is supplied. 12.Device for blow molding containers, which has at least one blow molding station for shaping thermoplastic preforms into the containers and in which the blow molding station is provided with at least two blow mold segments held by mold carriers, and in which a transport path is provided for the preforms and the containers, characterized in that the blowing station ( 3 ) is movably mounted along part of the transport path ( 30 ) and in that the blowing station ( 3 ) is coupled to at least one drive device such that a range of motion of the blowing station ( 3 ) running along the transport path ( 30 ) is superimposed on a movement area of the blowing station ( 3 ) running transversely to the transport path ( 30 ). 13. The apparatus according to claim 12, characterized in that a positioning device ( 29 ) is used for positioning the container ( 2 ) and the preforms ( 1 ), which has a clock drive. 14. The apparatus according to claim 12 or 13, characterized in that the blowing station ( 3 ) has at least two cavities for container formation. 15. The device according to one of claims 12 to 14, characterized characterized that a motion coupling for the Movements of the blow mold segments in the direction of the Transport route as well as across the transport route is provided. 16. Device according to one of claims 12 to 15, characterized in that a movement coupling between the blow mold segments and the transport device ( 29 ) is provided. 17. The device according to one of claims 12 to 16, characterized characterized in that the motion couplings at least to Part are realized mechanically. 18. Device according to one of claims 12 to 17, characterized in that at least one rotating drive roller ( 56 , 57 ) is used for the movement coupling, which positions a pivot bearing ( 46 , 47 ). 19. Device according to one of claims 12 to 18, characterized characterized in that the movement coupling at least to Part realized by a mechanical eccentric coupling is. 20. Device according to one of claims 12 to 19, characterized in that the mechanical coupling for each mold carrier ( 19 , 20 ) has at least two drive rollers ( 56 , 57 ) with pivot bearings ( 46 , 47 ) which are parallelogram-like with the associated mold carriers ( 44 , 45 ) are coupled. 21. Device according to one of claims 12 to 20, characterized in that a drive for the transport device ( 29 ) has at least one deflection wheel ( 32 , 33 , 34 , 35 ) and at least one flexible connecting element ( 40 ). 22. Device according to one of claims 12 to 21, characterized in that a drive for the positioning movement of the blowing station ( 3 ) has at least one deflection roller and at least one flexible coupling ( 62 , 71 ). 23. Device according to one of claims 12 to 22, characterized in that a positioning device for the blowing station ( 3 ) via a lever arrangement ( 63 ) is coupled to an associated drive. 24. The device according to claim 23, characterized in that the lever arrangement ( 63 ) has at least two levers ( 64 , 65 ), the respective axes of rotation of which are offset relative to one another. 25. The device according to claim 23 or 24, characterized in that the levers ( 64 , 65 ) are coupled to one another by engagement of a pin ( 69 ) in a longitudinal recess ( 70 ). 26. Device according to one of claims 12 to 25, characterized in that the stretching rod ( 11 ) is arranged immovably in the direction of the transport path ( 30 ). 27. The device according to one of claims 12 to 26, characterized in that the connecting piston ( 10 ) is arranged immovably in the direction of the transport path ( 30 ). 28. Device according to one of claims 12 to 27, characterized in that the lifting device ( 8 ) for the base part ( 7 ) together with the mold halves ( 5 , 6 ) in the direction of the transport path ( 30 ) movable and transversely to the transport path ( 30 ) is immovably arranged.