CN222495028U - Apparatus for producing plastic containers, mould and system consisting of a set of individual moulds - Google Patents

Abstract

The utility model relates to a device for producing plastic containers according to a forming-filling-sealing process, a mold, and a system composed of a group of separate molds, wherein the device at least comprises a forming device and a production device, wherein the production device has respective mandrels of an output device for filling a fluid, and the mandrels are respectively assigned to a mold recess (34) in the mold of the forming device, wherein the central longitudinal axes (36) of adjacent mandrels (12) have a predetermined constant spacing dimension A from each other, and the spacing dimension B between respective adjacent mold recesses of the molds that are different from each other at least in terms of the size of their mold recesses is adapted to the spacing dimension A within a parameterized range so that different container sizes can be produced using only one output device (14) and a group of parameterized molds. According to the utility model, the costs associated with the equipment and mold manufacturing are reduced while the productivity of the finished containers is comparable to that shown in the prior art.

Description

Apparatus for producing plastic containers, mould and system consisting of a set of individual moulds

Technical Field

The utility model relates to a device for producing plastic containers according to a form-fill-seal process (BFS process) and to a corresponding mold, comprising at least one forming device having at least one mold having a plurality of mold recesses of predetermined contour and volume of the corresponding container, and a production device which supplies plasticized plastic material to the corresponding mold of the forming device, by means of which the container is formed and can be closed after filling with fluid, and which has individual spindles of an output device for filling with fluid, which spindles are each assigned to one mold recess in one mold of the forming device.

Background

DE 10 2020 002 077 A1 discloses a method and a related device for producing at least one container filled with a medium, made of plastic material, characterized by at least the following method steps:

Extruding the hose in a pre-forming position in a vertical extrusion direction by means of an extrusion device with the use of an auxiliary gas;

-closing the hose at its lower end and separating it at its upper open end;

Transporting the preform thus cut to length from the preform position into the open mold in a linear transport direction transverse to the extrusion direction by means of a gripper device;

-transferring the preform into the opened mould in the main forming position by means of a clamping device;

-closing the mould so as to further shape the preform by means of a pressure gradient;

-filling and closing the preform, and

-Returning the gripper device for repeating the above method steps.

WO 02/49021 A2 discloses a method for blow moulding, filling and closing containers, wherein at least one hose of plasticized plastic material is extruded into an open mould. The hose is welded at its front end by closing the mould. Furthermore, the hose is cut off above the mould by means of a separating element in order to form a filling opening. The mould is then moved with the hose section located therein into a filling position, where the container is formed and filled by means of a blow mandrel in the mould. After filling, the container still in the mold is closed. Furthermore, a corresponding device is disclosed.

WO 2020/201661 A1 discloses a blow mould for a blow moulding machine for producing empty plastic containers in an extrusion or stretch blow moulding process, comprising two blow mould halves, each having at least one mould body and a base plate accommodating the mould body, at least one mould cavity being provided in the at least one mould body. A thermal insulation block made of a thermal insulation material is arranged between the mould body and the base plate and possibly other parts of the blow mould half. In this way, the mass to be heated or cooled again should be significantly reduced and the associated heating or cooling essentially only involves the mould body, thereby reducing the energy consumption associated therewith. The combination of a heatable and then immediately coolable mold cavity (in the form of a mold recess of the mold) with a polished molding wall surface of the mold cavity and a short cooling time also allows the production of plastic containers with a bright surface.

In these and other known plant solutions, the individual molds are produced for each container size and, in the case of the BFS process, specific filling or output devices are adapted to this together with their individual blow and/or fill spindles (hereinafter referred to as spindles). In the case of correspondingly large-volume containers, the number of mold recesses in the mold and the number of associated spindles of the filling or output device must be correspondingly reduced for space reasons. Also in view of the high productivity of the container, the number of mold recesses and the number of mandrels in the mold are increased if the container size is correspondingly small. Ultimately this results in an increase in the outlay in terms of mold production and production facility production, as is shown for example in DE 10 2020 002 077 A1.

Disclosure of utility model

Starting from the prior art, the task on which the utility model is based is to further develop the known solutions such that the costs associated with the manufacture of the apparatus and the mould are reduced in the case of a production rate comparable to that of the finished containers shown in the prior art.

The above object is achieved by a device for producing plastic containers according to a form-fill-seal process, a mold and a system of individual molds.

The apparatus according to the utility model comprises at least a forming device having at least one die with a plurality of die recesses of predetermined contour and volume of the respective container, and a production device which supplies plasticized plastic material to the respective die of the forming device, by means of which the container is formed and can be closed after filling with fluid, and which has individual spindles of the output device for filling with fluid, which spindles are each assigned to one die recess of one die of the forming device, wherein the central longitudinal axes of adjacent spindles have a predefinable constant distance dimension A from one another, and the distance dimension B between the individual adjacent die recesses of the dies differing from one another at least in terms of the dimensions of their die recesses is adapted to the distance dimension A in a parameterized range such that different container dimensions can be produced with only one output device and a set of parameterized dies. In this way, different sized filled containers can be produced using only one filling or output device with a predefinable number of spindles and different molds. The filling material is preferably a liquid, but may also be an emulsion or suspension for medical purposes, such as an infusion solution, a dialysis solution or an enteral nutrition solution.

It is surprising to a person skilled in the art of such shaping, filling and sealing processes that new machine and mould standards are achieved by the above-described parameterization of the distance dimensions, which results in a considerable reduction in the effort required for producing filled containers, in particular filled and sealed bottles having a volume of 50ml and more, in particular when, for example, the container shape/container dimensions should be changed and the mould therefore replaced, if the filling materials are identical. This is not equivalent in the prior art.

According to one embodiment of the utility model, the predefinable distance dimension a is between 5cm and 10cm, preferably between 5cm and 8 cm. The utility model also claims a mould for producing containers of different volumes, said mould being provided in particular for said apparatus. The plurality of dies of the dies have the same distance dimension B and the plurality of distance dimensions B correspond to a predefinable distance dimension a, which is derived in a parameterized range from the distance between the central longitudinal axes of the spindles of the output device that are adjacent to one another.

According to one embodiment of the utility model, the distance dimension B is achieved by different bridge widths S between adjacent mold recesses as a parameterized variable for producing containers of different volumes.

According to one embodiment of the utility model, the mold is used for producing containers having a nominal filling quantity of not more than 1 liter, characterized in that the parameterized bridge width S is selected in the range of 10 to 40mm, preferably 10 to 35mm, particularly preferably 10 to 33 mm.

According to one embodiment of the utility model, in order to maintain a predefinable distance dimension a, preferably 75mm, the individual bridge width S is parameterized to 28mm to 35mm for a nominal container volume of 100ml, 23mm to 33mm for a nominal container volume of 250ml and 12mm to 30mm for a nominal container volume of 500 ml.

According to one embodiment of the utility model, the mold is composed essentially of two identical mold halves, which are stacked on top of one another and define respective mold recesses, which are closed on the bottom side and open on the top side.

According to one embodiment of the utility model, the respective mold half is assembled from individual segments, comprising individual segments for the top side and individual segments for the bottom side and individual segments lying therebetween, the individual segments lying therebetween having mold recesses and bridges of predefinable width arranged between the mold recesses, the parameterized bridge width S of the bridges remaining constant within the individual segments.

According to one embodiment of the utility model, the individual segments, in particular the individual segments with the die recesses and the bridge between the die recesses with the parameterized width S, are made of aluminum bronze, in particular preferably beryllium-free aluminum bronze.

According to one embodiment of the utility model, the surface of the mold recess is polished.

According to one embodiment of the utility model, the mold is temperature-adjustable and preferably has a connection for guiding the cooling medium.

According to one embodiment of the utility model, the mold has 4 to 12, preferably 8 mold recesses each.

The utility model also relates to a system of individual molds, in particular of the type described, for use in particular in a device according to the utility model, which is characterized in that, for producing plastic containers of different volumes, individual molds are provided, which have mold recesses of different dimensions, which have the same distance dimension B from one another in a parameterized range, which corresponds to a predefinable distance dimension a between adjacent spindles of the output device.

According to one embodiment of the utility model, the system comprises at least two molds with which plastic containers having nominal filling amounts of 500ml and 250ml can be produced, in particular for medical use, such as for infusion and/or flushing.

According to one embodiment of the utility model, the system comprises at least two molds with which plastic containers having nominal filling amounts of 250ml and 100ml can be produced, in particular for medical use, such as for infusion and/or flushing.

Within the above-mentioned parameterization of the distance dimensions, it has proven advantageous to provide a predefinable distance dimension a for the spindle of the output device between 6 and 10 cm, preferably between 7 and 8 cm.

The molds used in the apparatus are characterized in that a plurality of molds for producing different containers, in particular of different volumes, have the same distance dimension B and a plurality of distance dimensions B correspond to a predefinable distance dimension a, which is derived as a grid dimension (Rasterma beta) in a parameterized range from the distance between the central longitudinal axes of the spindles of the output device that are adjacent to one another.

It is preferably provided here that the distance dimension B of the different molds for producing containers of different volumes is achieved by different bridge widths S between adjacent mold recesses as a parameterization variable (PARAMETRIERGR e). It has been shown that, when using semi-crystalline plastics as plastic material for container products, a high surface quality and a higher transparency of the container can be achieved by a suitable selection of the respective bridge width S in order to ensure in a simple manner an optically non-destructive inspection of the finished container, for example involving possible particle contamination of the container together with the container contents. For this purpose, it is provided in a particularly advantageous manner that the parameterized bridge width S is selected in the range of 10 to 40mm, preferably 10 to 35mm, particularly preferably 10 to 33mm, in order to produce containers with nominal volumes of less than 1 liter. It has proven to be particularly advantageous for the parameterization to maintain a predefinable grid or distance dimension a (which term of art is also denoted by the cavity distance and should preferably be 75 mm), the individual bridge width S being parameterized to 28mm-35mm for a nominal container volume of 100ml, 23mm-33mm for a nominal container volume of 250ml and 12mm-30mm for a nominal container volume of 500 ml.

In a further particularly preferred embodiment of the mold according to the utility model, it is provided that the mold is composed essentially of two identical mold halves which are stacked on one another and which define respective mold recesses with one another, which are closed on the bottom side and open on the top side. The respective mold halves are preferably assembled from individual segments (Einzelsegment) comprising an individual segment for the top side and an individual segment for the bottom side and an individual segment lying therebetween, the individual segments lying therebetween having mold recesses and a bridge with a predefinable width arranged between the mold recesses, the parameterized bridge width S of the bridge remaining constant within the individual segments. In this way a modular system is provided which is made up of a plurality of different individual segments which can be assembled into corresponding moulds so that only a few basic parts are required to cover a large number of container sizes and container shapes. In particular, the same individual segments can be used for the top side and the bottom side, as long as only the individual segments lying therebetween with the mold recesses are adapted to different container volumes. For example, for small container volumes, the axial installation length of the intermediate individual section can be designed to be shorter than for large-volume containers, i.e. the container volumes to be produced can be predetermined by the installation length of the mold recess or cavity in the intermediate individual section, the longitudinal axis of the respective mold recess extending concentrically with the longitudinal axis of the dispensable spindle of the filling or delivery device during operation, i.e. in spite of the change in volume in the mold, in this case the distance dimension B does not change.

In a further preferred embodiment of the die, it is provided that the individual segments, in particular the respective individual segments with the die recesses and the bridges therebetween with a parameterized width, are made of aluminum bronze, particularly preferably beryllium-free aluminum bronze. The use of such materials may increase the thermal conductivity of the mold as compared to other materials used, such as aluminum, steel, or nonferrous metals, thereby increasing the productivity of the BFS production process and providing good inspectability of the container product.

In order to improve the surface quality of the container, it may also be provided that the surface of the mold recess of the mold is polished.

On account of the standardization of the individual segments for the molds, it is also possible to uniformly temperature the molds and to provide them with connections for guiding the cooling medium in a particularly simple manner.

In the context of overall parametrization, it has also proven to be advantageous in terms of productivity that the respective mold has 4 to 12, particularly preferably 8 mold recesses as a further grid dimension.

The subject of the solution according to the utility model is also a system consisting of a set of moulds, characterized in that, for the production of plastic containers of different volumes, individual moulds are provided, which have mould recesses of different dimensions, which have the same pitch dimension B in a parameterized range with respect to each other, which corresponds to the predefinable pitch dimension a between the spindles of the filling or output device. With such a system, different moulds can be used to produce container products having different volumes without substantial modification of the filling or output device. Typical nominal filling amounts (the amounts that should be contained in the package according to section 6 of the metering method) of such containers for infusion solutions are for example 50ml, 100ml, 250ml and 500ml. Since a certain amount of air is also required in the containers, the total volume of these containers is always greater than the nominal filling amount. For nominal filling amounts of more than 50ml, the containers are usually fully formed in the mould by blowing sterile air through the respective mandrels prior to filling.

Drawings

The solution according to the utility model is described in detail below with reference to the accompanying drawings by means of examples. The figures are shown here in schematic and not to scale views. The drawings are as follows:

fig. 1 shows in perspective view a filling or delivery device with 8 spindles and a mold half of the mold according to fig. 3 arranged thereunder;

Fig. 2 shows in perspective view a mould consisting of two mould halves separated from each other, said mould halves being assembled substantially from three separate segments, respectively;

Figures 3 to 5 show in perspective view the mould halves of moulds with container dimensions 100ml, 250ml and 500ml respectively, and

Fig. 6 shows a container product in a side view, which can be produced, for example, by means of a mold according to fig. 3.

Detailed Description

In the prior art already cited, the hose extruded from the hose head is introduced into a mould by means of a clamp (DE 10 2020 002 077 A1) or is extruded directly into an open mould.

For simplicity, only the filling or delivery device 14 of the above-described construction and its individual blow-filling spindles 12 are shown in fig. 1, which serve for blow molding and delivering the respective filling medium into the container body 18 of the container 16 to be produced in each case. The output device 14 can be moved up and down in the vertical direction by means of a servo drive 20. In particular, after filling the respective container body 18, the mandrel 12 can be moved back upwards, so that a closing unit, not shown further, can close the respective container product by means of a head part 22 to be formed, which is usually integrally connected to the container body 18 by means of a neck part 24 (see fig. 6). The sealing unit is a prior art, and thus a detailed description thereof will not be provided herein.

For a simpler illustration and better understanding, the above-described additional components of the extrusion head or the molding device are not shown in any case.

In the illustration according to fig. 1, one mold half 32 of the mold 28 is in each case shown below the filling or output device 14, as is shown in more detail in fig. 2 for a predefinable container size. The simplified illustration described above should only illustrate that each mandrel 12 is assigned one mold recess 34 with introduced hose material or container material, only half of the mold recess 34 in the associated mold half 32 being shown in fig. 1. The entire mold recess 34 formed by the two closed mold halves 30, 32 as the respective mold 28 is used here for container production, and the plastic hoses respectively plasticized by the extrusion head described above enter the assigned mold recess 34 of the respective mold 28 of the molding device 26. The forming hose is separated on the top side and the container body 18 is formed in the associated mold recess 34 by blow molding and/or vacuum forming by means of a sleeved mandrel and filled with a predefinable medium, such as a liquid drug, by the mandrel 12 of the filling or delivery device 14. For this purpose, the filling or delivery device 14 with its spindle 12 is located in the lowered filling position using the servo drive 20. Subsequently, the device 14 is moved back upwards in the opposite direction and head forming and closing takes place by means of a closing unit, not further shown, as described above. The container product thus produced leaves the mould 28 as a filled container 16, as schematically shown in fig. 6. Of course, other container geometries may be made at will, if desired.

As further shown in fig. 1, the central longitudinal axes 36 of adjacent mandrels 12 have a predefinable constant spacing dimension a from one another. All filling spindles 12 are hollow-cylindrical in shape for fluid output and are concentric with their respective central longitudinal axes 36. For simplicity, the distance dimension a is plotted as a hypothetical variable only for the two mandrels 12 on the right, as viewed in the viewing direction of fig. 1. The pitch dimension a is constant in this regard between all adjacent mandrels 12. The distance dimension B between adjacent mold recesses 34 of the molds 28, which differ from one another at least in terms of the dimensions of their mold recesses 34, is adapted to the distance dimension a in such a way that different container sizes can be produced with only one output device 14 and one set of parameterized molds 28. According to the illustration of fig. 1, a distance dimension B corresponding to the distance dimension a is formed here by the central longitudinal axes 38 of two adjacent mold recesses 34 of the mold 28. In this regard, pitch dimension B, like pitch dimension a, is also a hypothetical reference variable within the scope of the parameterization. Only half of the mold recess 34 is shown in fig. 1, but once the mold halves 30, 32 are brought into abutment with one another to form a complete mold 28, the dimensional relationship of the spacing of a and B is also applicable to the corresponding complete mold recess 34. In this case, it has proven to be particularly advantageous if the predefinable distance dimension a is selected between 6 cm and 10 cm, preferably between 7 cm and 8 cm.

As can be seen in particular from fig. 3 to 5, all the molds 28 for different container volumes, for example 100ml, 250ml and 500ml, have the same spacing dimension B, which corresponds to the predefinable spacing dimension a according to fig. 1. The illustrations according to fig. 3 to 5 show respective front views of the mold halves 32 of the respective molds 28, and the central longitudinal axes 38 of adjacent mold recesses 34 or mold recess halves are identical for all molds 28 according to fig. 3 to 5. In particular, the mold 28 according to fig. 3 corresponds to the mold 28 used according to fig. 1, in each case half being shown. Thus, the plurality of molds 28 for different containers 16 having different container volumes have the same pitch dimension B, which corresponds to the pitch dimension a measured between the central longitudinal axes 36 of two adjacent mandrels 12 in the mandrel arrangement according to fig. 1. Thus, the pitch dimension B is derived from the pitch a in the parameterized range.

The distance dimension denoted by reference symbol B between the central longitudinal axes 38 of two adjacent mold recesses 34 has proven to be particularly advantageous in terms of art also referred to as the cavity distance B, and in the scope of the embodiments presented here a cavity distance B of 75mm has proved to be particularly advantageous. For a simpler illustration, in fig. 3 to 5, the respective central longitudinal axes 38 are also drawn only for the two right-hand mold recesses 34, but the relationship applies to all mold recesses 34 of the mold 28 according to fig. 3 to 5, which are configured equidistantly in this respect.

In order to achieve a constant spacing dimension B in the different molds 28 according to fig. 3 to 5 for producing containers 16 of different volumes, different bridge widths S are achieved between adjacent mold recesses 34 for the molds 28 as parameterized variables.

Thus, to produce a container 16 with a volume of 100ml, the mould 28 according to fig. 3 (half shown) uses a value of 32.2mm as a parameterized variable or bridge width S, measured between adjacent walls of mould recesses 34 adjacent to each other as shown in fig. 3. In this connection, the bridge width S is the same for all the mold recesses 34 in the embodiment according to fig. 3.

In the embodiment according to fig. 4 for producing a container 16 with a volume of 250ml, a value of 26.5mm is selected as bridge width S and thus as a parameterized variable, with the pitch dimension B remaining constant, as previously described, for all dies 28 according to fig. 3 to 5. In the embodiment of the mould 28 according to fig. 5 for producing a corresponding container volume of 500ml, a value of 26.5mm is also selected as bridge width S, which corresponds to bridge width S according to fig. 4. Compared to a container volume of 250ml according to half of the one shown in fig. 4, a container volume of 500ml which is doubled in the solution according to fig. 5 is obtained in that the respective mould recess 34 is correspondingly elongated in the axial direction, i.e. in an orientation concentric with the respective central longitudinal axis 38. In this regard, the pitch dimension B also remains constant and adapts to the pitch dimension a.

In summary, for containers 16 with a volume of less than 1 liter, the parameterized bridge width S is produced in the range of 10 to 40mm, preferably 10 to 35mm, particularly preferably 10 to 33mm, as explained in the embodiments according to fig. 3 to 5.

In particular, in order to maintain a predefinable, preferably 75mm, spacing dimension a, for containers, in particular for infusion solutions or flushing solutions, with nominal filling volumes of not more than 500ml, the respective bridge width S is parameterized to 28mm-35mm for a 100ml container nominal volume, 23 mm-33 mm for a 250ml container nominal volume and 12 mm-30 mm for a 500ml container nominal volume.

If only containers with nominal filling levels of not more than 250ml should be produced with a set of moulds 28, it is preferred that the pitch dimension a is 50mm and the bridge width S as a parameterized variable is 10mm to 20mm.

Furthermore, as further shown from fig. 2, each mold 28 essentially consists of two identical mold halves 30, 32, which define, one upon the other, a respective mold recess 34, which is closed toward the bottom side 40 and open toward the top side 42. As can be further seen from fig. 2, the respective mold halves 30, 32 are assembled from individual segments 44, 46, 48, including individual segments 44 for the top side and individual segments 46 for the bottom side 40, with individual segments 48 therebetween, which have a major portion of the respective mold recess 34. Between adjacent mold recesses 34 in a row, there are individual bridges 50 extending parallel to one another, whose bridge width S is correspondingly parameterized according to the illustrations according to fig. 3 to 5 and remains constant within the individual segments 46. In this regard, the bridge 50 extends transversely to the longitudinal orientation of the respective individual segments 44, 46 and 48. As can further be seen from the view of fig. 2, the respective mold 28 is provided with a connection 52, which is not illustrated in more detail, for supplying and discharging a cooling medium in order to cool the introduced plasticized plastic material rapidly within the scope of the container production or for applying a vacuum in the respective mold recess 34, in order to ensure clean abutment of the plastic material against the mold walls of each mold recess 34.

As shown in fig. 3 to 5, a system of individual molds 28 is provided which have mold recesses 34 of different dimensions, but all have the same spacing dimension B from one another within the parameterization range, which corresponds to the predefinable spacing dimension a between adjacent mandrels 12 of the output device 14. In this regard, the molds 28 are generally distinguished from one another within the described parameterization range by essentially only the predefinable bridge width S of the individual bridges 50 of each mold 28.

In order to reasonably maintain the relevant parametrization of the pitch dimension B and the bridge width S, it has proven advantageous to provide a total of eight mandrels 12 and eight mold recesses 34 in each mold 28 within the scope of the rapid production sequence. This achieves a high yield of finished containers 16.

For simplicity, all illustrations of the mold 28 do not show the relevant forming means for producing the head piece 22 for the respective container 16. The head forming apparatus described above is common and will not be described in detail herein.

Furthermore, semi-crystalline polyolefins are suitable as plastics for the production process according to the utility model and as container materials, for example Polyethylene (PE), in particular low-density polyethylene (PE-LD), high-density polyethylene (PE-HD) and polypropylene (PP). Blends of semi-crystalline polyolefins with amorphous polyolefins, such as Cyclic Olefin Polymers (COPs) and Cyclic Olefin Copolymers (COCs), can also be advantageously processed. Thus, it is also possible to produce containers 16 as in DE 10 347 A1, which have a corresponding multilayer structure for the container walls.

As a specific example, a bottle-type packaging device of the bp 321 type from rommelag company of weibulin root, germany was used to manufacture water-filled and closed one-piece infusion containers 16 from different PP and PE materials according to a blow molding, filling and sealing or sealing process, having four different nominal volumes (100 ml, 250ml, 500ml and 1000 ml) and an average wall thickness of 0.35 to 0.52mm. Materials used were PP LyondellBasell RP 270G;Borealis SB 815 MO, FLINT HILLS Rexene 23M2A and LDPE LyondellBasell Purell D3020D and 3220D. For this purpose, a mold 28 made of different materials is used, which has eight cavities or mold recesses 34 and the bridge 50 has different bridge widths S from 20mm to 50 mm. In the context of plastic container production, the corresponding mold recess 34 is correspondingly cooled by supplying a suitable cooling medium via the partial joint 52. The container shape of the container 16 shown in fig. 6 and produced with the aid of the device according to the utility model corresponds to the container solution shown in fig. 1 and 2 as DE 10 2016 002 467 A1.

In addition, the filled container body 18 is sterilized by heat treatment (autoclaving). The optical quality (clarity) of the various containers 16 is measured similarly to ASTM D1003-11. The total transmittance, haze (and image clarity), surface gloss, and color all have an effect on transparency. The transmittance, haze and clarity values of each BFS container 16 were determined using a haze-gard plus measurement device from BYK Gardner limited of 82538 Geretsried. The device measures the transmittance at light wavelengths of 550-650 nm. At the measuring point, the wall thickness of the container 16 is approximately 0.45mm.

The best results can be obtained with the container 16 and a bridge width S of between 10 and 40mm, preferably between 10 and 35mm, particularly preferably between 10 and 33mm, especially if the die 28 and its die recess 34 are made of a beryllium-containing copper alloy, the beryllium content of which is typically between 0.5% and 3%. However, it is particularly preferred to use a mold 28 made of aluminum bronze that is beryllium free (less than 0.3% beryllium) and has an aluminum content between 8% and 16%, although its thermal conductivity at 20 ℃ is significantly lower than 100W/(m x K).

Although the mold 28 is temperature-regulated, the bridge width S and thus the heat capacity which can be used directly for cooling the hot, soft plastic hose play a decisive role in the crystallization properties (nucleation and nucleation) of the plastics used. This is especially true when using a die 28 made of aluminum bronze. It has proven advantageous for the transparency characteristics of the respective containers 16 to polish the walls of the mold recess 34 of each mold 28.

In this way, a device for producing containers 16 at low cost, in particular for filling fluids for medical purposes according to the BFS process, is provided, by means of which the surface quality of containers 16 can be improved and the transparency can be increased by means of a reasonable parameterization of the bridge width S in the case of semi-crystalline plastics, and thus an optically non-destructive inspection, for example particle contamination involving containers 16 and container contents, can be facilitated.

Claims (26)

1. Device for producing plastic containers (16) according to a form-fill-seal process, comprising at least one forming device (26) having at least one die (28) with a plurality of die recesses (34) of predetermined contour and volume of the respective plastic container (16), and a production device which supplies plasticized plastic material to the respective die (28) of the forming device (26), by means of which the plastic container (16) is formed and can be sealed after filling with fluid, and which has mandrels (12) of an output device (14) for filling with fluid, which mandrels are each assigned to one die recess (34) in one die (28) of the forming device (26), characterized in that the central longitudinal axes (36) of adjacent mandrels (12) have a predefinable constant distance dimension A from one another, and that the distance dimension B between the respective adjacent die recesses (34) of the dies (28) differing from one another at least in terms of the dimension of their die recesses (34) is adapted within a parameterization range such that the container can be produced with only one output device (14) and one set of differing dimension of die parameters.

2. The apparatus of claim 1, wherein the predefinable pitch dimension a is between 5cm and 10 cm.

3. The apparatus of claim 1, wherein the predefinable pitch dimension a is between 5cm and 8 cm.

4. A mould for producing containers of different volumes, which is provided for the apparatus according to any one of claims 1 to 3, characterized in that a plurality of moulds (28) of the moulds have the same spacing dimension B and a plurality of spacing dimensions B correspond to a predefinable spacing dimension a, which is derived in a parameterized range from the spacing between mutually adjacent central longitudinal axes (36) of the spindles (12) of the output device (14).

5. Mould according to claim 4, characterized in that for producing plastic containers (16) of different volumes, the spacing dimension B is achieved by different bridge widths S between adjacent mould recesses (34) as parameterized variables.

6. A mould according to claim 5, characterized in that the mould is used for producing containers (16) with nominal filling amounts of not more than 1 litre, the parameterized bridge width S being selected in the range of 10 to 40 mm.

7. The mold according to claim 6, characterized in that the parameterized bridge width S is selected in the range of 10 to 35 mm.

8. The mould according to claim 6, characterized in that the parameterized bridge width S is selected in the range of 10 to 33 mm.

9. A mould according to any one of claims 5 to 8, characterized in that, in order to maintain the predefinable gap dimension a, the respective bridge width S is parameterized 28-35 mm for a 100ml container nominal volume, 23-33 mm for a 250ml container nominal volume and 12-30 mm for a 500ml container nominal volume.

10. The mold of claim 9, wherein the predefinable pitch dimension a is 75mm.

11. The mould according to any one of claims 5 to 8, characterized in that it consists of two identical mould halves (30, 32), respectively, which are superimposed on each other and define respective mould recesses (34) with each other, which are closed at the bottom side (40) and open at the top side (42).

12. The mould according to any one of claims 5 to 8, characterized in that the respective mould halves (30, 32) are assembled from individual segments (44, 46, 48), comprising an individual segment for the top side (42) and an individual segment for the bottom side (40), and an intermediate individual segment having mould recesses (34) and a bridge (50) of predefinable width arranged between the mould recesses, the bridge parameterized bridge width S remaining constant within the intermediate individual segment.

13. The mold according to claim 12, characterized in that the individual segments (44, 46, 48) are made of aluminum bronze.

14. A mould according to claim 13, characterized in that the intermediate individual segments with mould recesses (34) and bridges (50) with a parameterized width S between the mould recesses are made of aluminium bronze.

15. The die of claim 13, wherein the individual segments (44, 46, 48) are made of beryllium free aluminum bronze.

16. The mold according to any one of claims 5 to 8, characterized in that the surface of the mold recess (34) is polished.

17. The mould according to any one of claims 4 to 8, characterized in that the mould is temperature-adjustable.

18. The mould according to claim 17, characterized in that the mould has a joint (52) for guiding a cooling medium.

19. The mould according to any one of claims 5 to 8, characterized in that the mould has 4 to 12 mould recesses (34), respectively.

20. The mould according to claim 19, characterized in that the mould has 8 mould recesses (34) each.

21. System of individual moulds (28) according to any of claims 4 to 20, characterized in that for producing plastic containers (16) of different volumes, individual moulds (28) are provided, which have differently sized mould recesses (34) which all have the same pitch dimension B to each other within a parameterization range, which pitch dimension corresponds to a predefinable pitch dimension a between adjacent mandrels (12) of the output device (14).

22. A system according to claim 21, characterized in that the system is for a device according to any one of claims 1 to 3.

23. The system according to claim 21, characterized in that it comprises at least two moulds (28) with which plastic containers (16) having nominal filling amounts of 500ml and 250ml can be produced.

24. The system according to claim 21, characterized in that it comprises at least two moulds (28) with which plastic containers (16) having nominal filling amounts of 250ml and 100ml can be produced.

25. The system according to claim 23 or 24, wherein the plastic container (16) is a plastic container for medical use.

26. The system according to claim 25, characterized in that the plastic container (16) is used for infusion and/or flushing.