WO1997029018A2 - Packaging for flowable products and process and device for producing said packaging - Google Patents

Abstract

The invention relates to packaging for flowable contents which has shell-like side walls (2) with a first plastic material and a base (3) and a head section (4) having an upwardly projecting pouring and closure device (7). Said walls consist of a second plastic material which can be sealed to the first plastic material. For economical production of said packaging which is also provided with a screw plug, according to the invention it is provided that the unfilled package (1) is sealed to be gas-tight on all sides, the pouring and closure device (7) has a collar (8) closeable by a screw cap, and the head section (4) tapers toward the top.

Description

 Elastic packaging and method and device for producing such packaging

The invention relates to a packaging for flowable filling goods with sleeve-shaped side walls with a first plastic material and with a bottom and a head part having an upwardly protruding pouring and closing device, which consist of a second plastic material that can be sealed with the first plastic material. Furthermore, the invention relates to a method and an apparatus for producing a packaging of the type mentioned above.

There are manufacturing processes for packaging end parts, i.e. known for a floor or a head part, in which this end part is produced by injection molding. The corresponding molds for injection molding are divided in order to be able to demold the molded part better. Another known method, blow molding, can also be used to split the mold. The production of plastic parts by means of negative molds generally does not use any tools with an undercut, with the result that a bottle neck with a thread cannot be provided in this way, because this could only be removed from the mold in a very complex manner.

Other attempts at negative molding used a stretching die, and the final molding was done by vacuum or compressed air. In the manufacture of bottles with a thread, it has been shown that by pressing in the stretching punch in a heated plastic film in the case of a bottle neck with a thread, the finished thread is far too thin, because stretching just laughs at the flanks where the threads turn be formed, the material is too thin. Such a thread is unusable because you could easily overtighten a screwed-on cap, for example.

Without a closure with a thread, packaging has been developed elsewhere of the type mentioned above, which has an almost flat head part with only a little protruding pouring device and a corresponding bottom. The head part is first sealed to a sleeve and this cup-shaped intermediate is then ready for filling. After filling, the bottom is sealed, although both the head part and the bottom are formed from end pieces, but for holding and for the sealing process, these have a radially outwardly projecting edge, which can be achieved by special tools in an additional process step must be cut off. Even this increase in the cost of manufacture represents a disadvantage of the known packaging, quite apart from the impossibility of a screw cap and the disadvantage of a flat, relatively large head space between the upper level of the filling material and the end edge of the sleeve on which the bottom is sealed. As a result, the pack of filling volume is lost.

The method is disadvantageous with regard to the additional method steps and the tools necessary for separating the protruding edge mentioned; and also because the method does not allow the attachment of a thread closure without further ado. The device for producing the known packaging is constructed correspondingly disadvantageously.

The invention has for its object to make a packaging of the type mentioned cheaper to manufacture and to provide with a screw cap, to provide a method for producing such packaging, which allows a technically easier to manufacture and good material distribution in the bottom and headboard; and to provide a device with which such a pack is technically simple to manufacture, so that the expected technical advantages also result.

With regard to the packaging, the object is achieved according to the invention in that the unfilled package is sealed gas-tight on all sides, the pouring and closing device has a collar with an external thread that can be closed with a screw cap, and the head part is tapered towards the top. The new pack is initially sealed gas-tight on all sides, i.e. without filling, both the bottom and the head part are sealed to the sleeve-shaped side walls, while the pouring and closing device is still closed, although the separately supplied screw cap does not yet provide the actual closure, but is manufactured separately and is included. An unexpected advantage is the better possibility of producing or filling aseptic packaging. Understandably, a pack partially produced at very high temperatures (sealing temperatures for plastics) is largely germ-free and remains so even if it is gas-tight on all sides after manufacture and before filling. To fill, a disc-shaped spout is only required on the outside of the collar of a protruding pouring device Skin of the intermediate product to be cut open, and the package can then be filled by the pouring device. Such a filling device can automatically ensure that screw caps are screwed on after filling. Due to the design of the head part tapering upwards towards the pouring device, the head space is smaller and the usable volume of the new pack is increased. According to the invention, it is also advantageous if the head part has at least one stiffening ring encompassing the collar in plan view. A stiffening ring consists of an annular area with a larger material thickness. With a head part with a maximum diameter of, for example, 95 mm, the material thickness in the stiffening ring can be 1.2 mm. A stiffening ring expediently lies in the region of the maximum diameter, ie at the bottom at the point at which the head part is connected to the upper end edge of the sleeve-shaped side walls. Another stiffening ring can advantageously be located next to the collar for the collar, which gives the collar additional rigidity. This also has the advantage that the thread on the collar can absorb a greater torque. The arrangement of additional stiffening rings in the area of the head part outside the collar brings additional stiffening areas that can be provided if one considers it expedient; if, for example, the material thickness of the head part next to the stiffening rings is small for reasons of material saving, these areas have a thickness of 0.8 mm or only 0.6 mm, for example. The respective stiffening ring results in bracing, which can increase the stackability and the fall height of the pack.

It is also advantageous according to the invention if the free end of the collar is provided with a closed, raised edge and if the sleeve-shaped side walls preferably have a longitudinal sealing seam. The tubular side walls can be produced, for example, from sections of a web or individual arches, the free end edges of which are superimposed and connected to one another to form the longitudinal sealing seam mentioned. Such a sleeve is an intermediate product and has edges at opposite ends, on which the head part on the one hand and the bottom on the other hand can be sealed in the manner described above.

Although the free end of the collar is closed by a disk-shaped skin or a plate in the initially closed pack, it is nevertheless possible to provide the aforementioned raised edge on the outer edge of the collar, which comes to lie at the top of the filled pack. After filling the package, when the contents have reached, for example, the upper end edge of the sleeve-shaped side walls or slightly exceed this level, a film can be easily and even gas-tightly sealed for sealing and possibly also for opening indication. The cap can be screwed on via this film. For the first opening, the end user unscrews the cap and recognizes from the perfectly sealed film (along the raised edge) that the package has not yet been opened. In an advantageous further embodiment of the invention, the head part is curved outwards, the collar is arranged in the middle, and the head part is preferably sealed to the upper edge of the side walls by means of an annular flange. The curvature of the head part towards the outside allows the indispensable head space to be retained and yet reduced so that the volume available for the filling material can be optimally used within the packaging. The arrangement of the collar in the middle on this curved head part is not only favorable for the head space and the volume, but also the production is simplified, including the tools that can be used.

Each end piece, i.e. both the head and the bottom can preferably be sealed with the aid of an annular flange on the respective end edge of the sleeve-shaped side walls. This ring flange then extends outwards over a length of, for example, 4-6 mm over the end edge of the sleeve-shaped side walls downwards in the direction of the longitudinal central axis, i.e. over the surface of the side walls. This results in a good mechanical fastening between the end piece and the sleeve-shaped side walls, and the liquid or even gas tightness at this connection point is considerably improved.

According to the invention, it is also favorable if the base has a bead near its outer edge. In the finished, filled packaging, this acts like a crumple zone and thus acts as a shock absorber. The drop height is improved by this bead, because the crumple zone prevents the floor or headboard from bursting away from the side walls or the connecting seam from bursting open. The stackability of a packaging provided with such a base is also improved.

The above-mentioned packaging is solid and easy to transport as an intermediate product, because the head part is closed at the top in the region of the collar. The package is opened for filling by means of a cutting device which can be easily installed at various points on the packaging machine.

A pack of the type described above can be produced inexpensively and allows very practical handling for the manufacturer, for the filling company and also for the end user. For example, the manufacturer does not have to first create a protruding edge for mounting purposes and then punch it out with separate tools. In a material-saving manner, according to the invention, a disc-shaped end part is used, the outer edge of which ultimately forms the outer material end edge that the head part or the bottom needs for attachment to the sleeve-shaped side walls, preferably in the form of the respective one End edge drawn over the ring flange. The end of this ring flange then results from the outer edge of the disk-shaped end part. This outer edge can be round or polygonal and, depending on the cross-sectional shape of the desired packaging, oval, elliptical, circular or quadrangular, for example with rounded corners.

The sleeve-shaped side wall of the new packaging can consist of a foamed plastic, for example foamed polypropylene. In order to obtain barrier properties on the one hand and a good print image on the outside of the side walls on the other hand, at least one additional layer is applied on the outside and inside of the foamed plastic. The material of the base and headboard is thermoformable and sealable with the sleeve-shaped side walls. The material of these end parts also has barrier layers.

With regard to the method for producing a packaging for flowable filling goods with sleeve-shaped side walls with a first plastic material, for example polypropylene, and with a bottom and a head part having an upwardly protruding pouring and closing device, which consists of a second plastic material which can be sealed with the first plastic material consist, each preheated a disk-shaped blank, shaped by deep drawing into the shape of the head part or bottom and sealed onto the end edge of the sleeve-shaped side walls having a longitudinal central axis, the object is achieved according to the invention in that the respective blank is held by vacuum, in addition to the holding areas are heated to thermoforming temperature, deep-drawn by vacuum and placed on the respective end edge of the empty sleeve, after which the edge of the blank is folded around the edge of the sleeve and sealed with pressure. The advantageous possibility of saving material and producing packaging with almost no waste using the least possible amount of material, if the end parts thereof are produced from prefabricated, disc-shaped blanks, has already been pointed out. The blanks are stored in a magazine and peeled off piece by piece, in order then to be subjected to the treatment just described. Vacuum is first used to hold, support and, if necessary, transport the respective blank. After removing the blank from the magazine, it is heated to a temperature necessary for deep drawing using conventional means. When heating up, the disc-shaped blank sags between the holding areas. The holding areas act as a heat sink and ensure that the cut areas lying thereon are not heated. The largest sag is in the middle of the free-hanging cutting area. The heat sink results in a temperature gradient in the disk-shaped blank itself. The temperature in the blank increases with increasing distance from the heat sinks. With the temperature of the thermoplastic material its property also changes. In the cold zones the material remains stiff and firm, in the warm zones it becomes more and more malleable as the temperature increases. Due to the influence of the weight, the disc-shaped blank sags when it is heated and softened. The resulting elongation leads to a reduction in the blank thickness. The material thickness decreases the most in those areas where the cut is warmest and sagging most. By cleverly placing the heat sinks, the temperature distribution and the material thickness distribution in the blank can be influenced according to the invention. According to the invention, the heat sinks are advantageously placed in such a way that, on the one hand, the edge of the blank can be heated to such an extent that it becomes sealable, and on the other hand the material thickness distribution is adjusted in such a way that a large material thickness is present in the area for the formation of the thread , while the smallest possible material thickness is present in the area of the subsequent opening. According to the invention, the areas lying on the heat sinks, which are hardly deformed and thinned, advantageously act as stiffening struts in the finished head part or bottom, the properties of which are mentioned above.

After the blank has been heated in the areas next to the stiffening rings mentioned, which are the holding areas, the deep-drawing takes place. Outside the edge, the blank is heated to the sealing temperature and can be folded around the end edge of the sleeve-shaped side walls in the manner described and sealed with pressure. This results in a uniform and gas-tight connection between the respective end piece and the sleeve.

It is advantageous according to the invention if, for deep-drawing the head part, a first, preferably annular, holding area encompasses the central area of the blank for the production of the collar and this central area is first deep-drawn, while a second holding area holds the disk-shaped blank further out, and if the annular surface between the first and second holding area after the collar is deep-drawn. This method for producing the head part has proven to be particularly inexpensive and technically simple, at the same time a good material distribution over the surface of the blank on the one hand and its thickness design on the other hand is possible. The vacuum force for holding the blank is limited if the mechanical expenditure is kept lower. By deep-drawing the central area to produce the collar in a first step and holding the central area in place by the first, preferably ring-shaped holding area encompassing it, a sufficient holding force is obtained, although only vacuum holes or vacuumed grooves serve as holding areas in a linear manner, while in places the The material is deformed during deep drawing. A tear off this cutting areas under deformation is advantageously prevented.

By holding the respective blank to form a center area which is free for deep-drawing and areas which are arranged radially further outward, the disk-shaped blank made of plastic can be uniformly heated from the very outside to the center. This allows the final shape of the headboard or base to be designed more precisely. This also contributes to the fact that the first ring-shaped Haltbe encompasses and holds the central region of the blank during its deep-drawing to produce the collar. In addition, it is advantageous if the heating of the other areas continues during the first deep-drawing process. The deep-drawing process according to the method according to the invention therefore does not interrupt the heating process. This also favors continuous operation of a packaging machine.

If high-molecular thermoplastics are used to produce the end parts, the thermal behavior of these thermoplastics can be optimally taken into account by the method according to the invention. Outside the heat sinks, i.e. of the preferably annular holding areas, in which the material gets and maintains a temperature of about 70 ° C, the areas next to it are brought to thermoforming temperature, which are between about 155 ° and 190 ° C. The sealing with the sleeve-shaped side walls should take place on the very outside next to the outer edge of the disk-shaped blank, which is why the blank is brought to sealing temperature there, temperatures of 170 ° - about 220 ° C.

It is also advantageous according to the invention if, after the collar has been deep-drawn, the central region of the blank with the collar is withdrawn from the plane of the remaining blank in the direction of the longitudinal central axis. The tapered design of the head part and in particular the dome-shaped curvature from the upper end edge of the sleeve-shaped side walls to the outside is hereby favored. The deep-drawn ring areas of the blank outside of the then already deep-drawn collar with an external thread are stretched outward and upward, so to speak, and brought into a tapered shape by this deep-drawing, so that when the vacuum is applied in the next deep-drawing step, not too large deformation movements have to be carried out. This facilitates the deep drawing of the second stage.

In a further advantageous embodiment of the invention, the more outer area is heated during the deep-drawing of the area of the blank that is located more towards the center. This applies to all successive procedural steps and for everyone deep-drawn areas of the blank. This is the best way to use the time and operate the machine continuously.

In a further embodiment of the invention, the device for producing the packaging of the type mentioned at the outset is characterized in that a fastening dome is rotatably and translationally driven about a longitudinal central axis and translationally in the direction thereof relative to a tool encompassing the dome and having a mold inner surface and having a suction opening, and a thread form bears radially within the inner mold surface, the inner mold surface opening towards the end face of the tool. The core of the new device is the lower region of the fastening mandrel and the tool, as far as the respective end piece is ultimately produced by these parts of the device. The fastening mandrel is elongated and has a longitudinal central axis about which it can be rotated so that the thread shape on the tool side, which is attached to the fastening mandrel, can be removed for demolding. In addition, the fastening mandrel is driven to be translatable in the direction of the longitudinal center axis, in order to be able to carry out the retraction of the method step described above. The central area of the blank is located under the lower or front end of the fastening mandrel, which carries a thread shape and is firmly connected to it. When vacuum is applied to this thread form, the collar is deep-drawn with its external thread. The collar can be pulled back by moving the fastening mandrel upwards or backwards in the direction of its longitudinal central axis.

During these movements of the fastening mandrel, the tool, which carries the inner surface of the mold forwards and downwards, remains stationary. The fastening mandrel can therefore be moved relative to this tool. The tool with its inner mold surface engages around the mandrel and thus also encompasses the thread form firmly connected to the fastening mandrel. If the term "front" is used here, it means the side of the tool which faces the workpiece. The movement means for the fastening mandrel are therefore located at the rear end thereof, while the thread form which is firmly supported by the fastening mandrel is located at the front. The inner mold surface of the tool is also at the front, and it opens towards the end face of the tool, which is also to be thought of as "front", where the essentially flat blank (the workpiece) is first applied.

Such a device is compact, has a simple structure in relation to the workpiece to be machined and can provide appropriately designed end pieces which are produced with little material and have good material distributions. It is also advantageous according to the invention if the tool has a first ring of suction openings arranged on the outside next to the inner surface of the mold and a second ring of suction openings is provided on the outside next to the inner surface of the thread form, and if preferably at a distance between the first and the second ring a third ring of suction openings opens on the inner surface of the mold. Suction openings can be accommodated in tools of the type described here in a relatively simple and very space-saving manner, and one can provide several suction openings one after the other in such a way that (when the vacuum is switched on "suction") lines are created which can be guided and created as desired. For example, self-contained lines can be created, for example ovals, polygons or circles. A wreath is generally similar to a circle and provides annular holding areas, described in other words above. If you look in the direction of the longitudinal central axis of the packaging in the axial direction into a head part, then that edge is located radially outside, which is connected to the side walls. In addition to this edge, which has to be heated to sealing temperature as an annular edge area before sealing, there is the aforementioned first ring of openings for mothers, to which the inner surface of the mold adjoins radially further inward. Furthermore, radially on the inside, either an additional ring of suction openings adjoins the inner surface of the mold, and on the radial inside, directly next to it, the central region for the production of the collar; or in another embodiment there is a third ring of suction openings radially therebetween, the openings of which open into the inner surface of the mold, which additionally creates an annular holding area between the outer first ring and the inner second ring, with the result that, in this embodiment, outer stiffening ring is also provided a medium stiffening ring is also created for the finished head part.

It is also expedient according to the invention if a sealing ring encompassing the tool is arranged such that it can be moved linearly in the direction of the longitudinal central axis relative to the tool and carries a preform ring adjacent to the end face of the tool. This seal ring ensures that the edge of the blank is folded over when the head part is sealed to the side walls. The sealing ring forms the outer edge of the blank with its preform ring in such a way that this process could also be called ironing or folding, in which the ring flange is ironed, folded and placed on the side face. The face with the preform ring can be designed like a bow bell. While the blank is being heated as a whole, the individual sections of the blank are deep-drawn radially from the inside out, so that the outer edge of the blank is the last to be deformed. This is the reason why the seal ring first grips the tool and remains idle until it takes care of folding the cutting edge with its preform ring got to.

In order to favor the radially outer edge of the blank and to create a good seal with the side walls, this edge is pressed on. For this purpose, in a further advantageous embodiment of the invention, the tool in the area of the preform ring is in the form of a cylindrical cylinder with the longitudinal center axis in the center, the inside of the preform ring is adapted to the tool and carries a preferably pneumatically movably driven membrane made of an elastomer in the annular surface. This membrane can apply radial forces perpendicular to the outer surface of the side walls and thus to the folded outer edge of the blank. This flexible membrane can preferably be inflatable and thereby enables the additional, uniform pressing force on the weld seam on the outer edge of the blank in addition to the preform ring. This force acts vertically on the surface and has an area-like effect. It can be controlled with the pressure of pneumatic means. The membrane can be released and retracted by switching from compressed air to vacuum. This embodiment is advantageously used with soft sleeve materials for the side walls of the packaging, for example if the sleeve is made from foamed plastic. This embodiment is also advantageously used for sleeves whose outer surface has unevenness. In the case of grooves, such as can be provided by longitudinal seams in the sleeve, the flexible membrane enables the soft, heated outer edge of the blank to be pressed optimally into the depressions.

The tool parts that come into contact with the blanks of the base and the head part during the molding process are heated to about 70 ° C.

In a modified embodiment of the invention, a shaped ring can be attached to the cassette for holding the sleeve, which can be moved in the direction of the longitudinal central axis relative to the cassette and the sleeve. In this embodiment, the sleeve for creating the packaging side walls is held in a hollow cassette which carries the shaped ring on the side facing the inner mold surface and the thread form. This can be moved away from the cassette and can be pulled back onto it after it has been actuated. Its axial forward movement is used immediately after folding the outer edge of the blank to smooth the outer contour of this outer edge, so that the package receives an attractive appearance and also the sealing of this outer edge of the blank with the side wall is optimized on the outside.

It is advisable to also preheat the upper end edge of the sleeve-shaped side walls, preferably to the softening temperature of the outer plastic of the side walls, which is to be sealed or welded to the plastic of the outer edge of the blank. It is also advantageous if, when this upper end edge of the side walls is heated, the sleeve as a whole is filled with cold air, which can be introduced into the cylindrical volume of the sleeve, for example, via a nozzle. It is sufficient if this cold air has a temperature of around 10 ° - 15 ° C. If the head section is sealed at the top and the bottom is sealed while the sleeve-shaped side walls are filled with cold air, this air heats up over time and creates an overpressure which prevents the outer surfaces of the packaging from bulging inwards. In other words, this overpressure can also be understood as a pressure equalization to the environment, which can prevent this indentation.

It has been shown that the linear holding of the blanks has a favorable effect on the precision of the end product in the course of their heating. The mentioned holder prevents an uncontrolled throwing of the flat plastic material of a blank which is essentially flat at the beginning. This also avoids inaccuracies in the further processing and thus the head part or the floor. By attaching the three rings of holding areas in the above-described embodiments, with a starting material thickness of approximately 1.2 mm, the material obtained next to the outer edge, where the head part is sealed onto the side wall, is approximately 1 mm, radially from the outside inwards. 2 mm, in the arched intermediate areas a thickness of approximately 0.8 mm (and possibly approximately 0.6 mm on both sides next to the stiffening ring arranged in between), after which a stiffening ring with a material thickness of 1.2 is formed radially inwards and directly outside the collar mm connects. The skin closing the collar at the rear upper end of the collar has a material thickness of, for example, 0.75 mm, and the raised edge on the collar at the top is only about 0.4 mm thick.

The above dimensions for the head part relate to the same embodiment of a head part as well as a base with a maximum diameter of approximately 95 mm and a starting material thickness of approximately 0.6 mm. The thicknesses of the base, viewed radially from the outside inward, are about 0.6 mm at the outer edge, about 0.5 mm at the transition into the bead, about 0.4 mm at the axially outermost point of the bead, about 0.6 mm at the transition of the bead into the inner surface and about 0.65 mm inside within the annular bead of the bottom. Further advantages, features and possible application chains of the present invention result from the following description of preferred exemplary embodiments in conjunction with the attached drawings. Show it:

FIG. 1 shows the side view of a packaging that can be produced according to the invention,

2 shows a cross-sectional view of the package, in which the end pieces are shown with thicker lines, FIG. 3 shows the upper end piece, the head part, in cross section,

FIG. 4 the lower end piece, namely the bottom, also in cross section,

5 shows the manufacturing device, which is tempered to about 70.degree

Fastening mandrel in the middle and the tool as well as sealing ring on the outside outside, in a first working position, in which a disk-shaped, circular, flat blank made of plastic just in front of and up to one

Heating by vacuum is applied (bottom), Figure 6 is the same view as Figure 5, but schematically in front under the

A heater is shown in operation, FIGS. 7-9 are views similar to FIG. 6, but with different thermoforming

Sections are shown, Figure 10 shows the device in a state similar to that in Figure 9, but with the

Heating under the device is replaced by the sleeve to which the head part is being sealed, FIG. 11 shows the counterpart of the device according to FIGS. 5 to 10 for creating the bottom, likewise with a sealing ring arranged radially on the outside in a first operating state similar to FIG. 5, Figure 12 shows the illustration similar to Figure 11 with schematically shown and switched on heating from above on the blank for the bottom of the

Packaging, Figure 13 is a view similar to Figure 12, showing the heating of the bottom of the

Packaging is complete, and Figure 14 shows an operating state similar to Figure 10, wherein the outer edges of the

Bottom is sealed with the lower end edge of the sleeve-shaped side walls.

The plasticizer pack 1 to be created here, which is shown in FIGS. 1 and 2 ready for filling and gas-tight on all sides, has sleeve-shaped side walls 2 axially in the middle foamed polypropylene, a bottom 3 at the bottom (which is shown enlarged in Figure 4) and a head part 4 (which is shown enlarged in Figure 3) on top.

In the embodiment shown here, the sleeve-shaped side walls 2 have a cylindrical jacket shape, which is why the bottom 3 and the head part 4 are also circular. The entire packaging 1 shown in FIGS. 1 and 2 is therefore rotationally symmetrical about a longitudinal central axis 5, which also extends into the head part 4 and the bottom 3 in FIGS. 3 and 4. At the same time, the longitudinal center axis of the devices for the head part 4 according to FIGS. 5 to 9 and for the bottom 3 according to FIGS. 11 to 14 is designated 5.

The head part 4 is curved from the ring flange 6 from below to the upwardly protruding pouring and closing device 7 tapering towards the rear. The pouring and closing device 7 consists of a cylindrical jacket-shaped collar 8 with an external thread 9. At the free upper end of the collar 8 one can see in FIG. 3 a raised edge 10 which is circular in plan view in the direction of the longitudinal central axis 5. At points a directly next to this raised edge 10, the thickness of the material is only 0.4 mm in an example where the large diameter below is approximately 95 mm. A membrane-like skin closes the collar 8 at the top, is designated by b and has a material thickness of approximately 0.75 mm.

Three stiffening ribs 6, 11 and 12 are arranged in the curved area of the head part 4 outside the collar 8, where the thickness of the material is approximately 1.2 mm. In between in the areas c (FIG. 3), the material thickness is approximately 0.8 mm, and close to the middle stiffening ring 11 at points d, the material thickness is 0.6 mm.

FIG. 4 shows the base 3 with the outer ring flange 13 with a material thickness at (e) of approximately 0.6 mm and the bead 14, which surrounds the flat central region 15 with a material thickness of approximately 0.65 mm. On the flank 16 rising outwards from this central area 15 to form the bead 14, the material thickness is 0.6 mm, tapers in the lower ring area 17 of the bead to a thickness of 0.45 mm, and then at the point f ( Figure 4) wiodor assume a thickness of about 0.5 mm.

The ring flange 18 shown clearly in FIG. 1 lies directly next to the outer stiffening ring 6, as can also be seen in FIG. 3. There is shown schematically on the left, broken off and enlarged, the upper end edge or upper edge 19 of the sleeve 20, with which the ring flange 18 is sealed, so that the side walls 2 become 2 from the sleeve. For the production of a packaging 1, as shown in FIGS. 1 and 2 in the ready-to-fill and closed state, one best considers the representation of FIGS. 5 to 10.

A flat, circular disk-shaped blank 23 made of plastic is applied to the end face 20 'of a tool 22 carrying the inner mold surface 21 and is held on the outside by suction openings 24 arranged in the manner of a ring and on the inside by suction holes 25. In the illustration in FIG. 6, this holding function of the radially outer first ring of suction openings 24 and the second inner ring of infant openings 25 can be seen more clearly by the holding function. There you can see the resulting annular holding areas, namely the outer holding area 24 'and the inner annular holding area 25 ^* .

Central in the longitudinal central axis 5 of the device is a mounting mandrel 26, which can be moved up and down linearly in the direction of the longitudinal central axis 5 and can also be rotated about the axis 5, on which a gear wheel 27 and a guide shaft 28 are accommodated in a bearing housing 29. A toothed rack, not shown, provides for a rotation of the fastening mandrel 9, on which the thread form 30 (FIG. 7) is firmly attached, with the toothed wheel 27 in active engagement.

In FIGS. 6 to 9, a heater 31 is shown schematically at the front under the device and under the end face 20 ', which heats the blank 23, in particular in the deep-drawn areas between the annular holding areas 24' and 25 '.

The fastening mandrel 26 (FIG. 5) is surrounded below the bearing housing 29 by a nut 32 and a guide plate 33, which together (29, 32, 33) can be moved up and down. This movement is preferably initiated pneumatically in order to ultimately bring the fastening mandrel 26 from the position of FIGS. 5 to 7 into that of FIGS. 8 to 10. A sealing guide 34 guides the fastening mandrel 26 and provides a seal for a vacuum, which will be described later. The sealing guide 34 is surrounded on the outside by a tool holder 35 and a cylinder mounting plate 36 arranged underneath.

From below, a sealing ring 37 surrounds the tool 22 and hold a rubber membrane, preferably made of silicone rubber, which is denoted by 38 and is shown with black lines.

5, a circular disk-shaped blank 23 is produced on the end face 20 'of the tool 22 with the aid of the annular holding areas 24' and 25 ' created and held.

The switched on heater 31 is brought into the position of FIG. 6. The holding areas 24 ″ and 25 ′ act as heat sinks, so that the blank 23 is heated between them, sags and is thinned out most in the areas of the largest slack, which are also at the highest temperature Central region 23 'of the blank 23, which is delimited on the outside by the annular holding region 25', reaches its thermoforming temperature, then small suction holes (not shown) in the thread form 30 are subjected to vacuum, so that this central region 23 'is deep-drawn, as in the deep-drawn region State of Figure 7 is shown.

The operation of the heater 31 continues, so that the outer ring region 23b will soon also reach thermoforming temperature. Now the fastening mandrel 26 is moved in the direction 39 (arrow in FIG. 7) upwards in the direction of the longitudinal central axis 5 into the position in FIG. 8. In other words, the thread form 30 together with the fastening mandrel 26 firmly attached to it is moved back upwards so far that the front lower plane of the thread form 30 comes to the level of the inner, upper and rear ring edge 40 (FIG. 7). The ring areas 23b of the blank 23 have been softened (due to the temperature increase) such that elongation in the shape of a truncated cone as shown in FIG. 8 is readily possible and without tearing off the annular holding area 24 'between the blank 23 and the tool 22. In the state of FIG Figure 8, the collar 8 is formed by deep drawing and is now cooled in that cooling water is introduced through the inlet 41, flows through the cooling channels 42 and flows out through the outlet 43.

The outer ring region 23b of the blank 23 is now also at the thermoforming temperature, and vacuum can now be applied via the connection 44 (FIG. 9), so that the third and middle ring of suction openings 45, if necessary with the aid of other, not shown, mammalian openings Performs deep drawing process and brings the blank 23 into the shape shown in Figure 9 with the outer, middle and inner reinforcing ring. While the outer ring region 23b of the blank 23 comes into contact with the tool 22 and is cooled by it, the heater 31 still acts on the outer edge 46 of the blank. This is already quite soft in the illustration in FIG. 9 and is therefore shown depending on the outside at the bottom.

In Figure 10, the heater 31 is now removed and shown replaced by the sleeve-shaped side walls 2. The sealing ring 37 bears in its annular, front, lower level 47 a preform ring 50 fastened to the sealing ring 37 by screws 49. This has a sloping surface 51 which opens in the shape of a truncated cone towards the front and which, like a bending process when the sealing ring 37 is moved down in the direction of the arrow 52, the soft and therefore deformable edge 46 of the blank 23 downwards Direction 52 of the longitudinal central axis 5 folded over and unfolded onto the upper edge 19 of the sleeve 20 shown on the left in FIG. When the area on and next to the upper edge 19 of the sleeve 20 is heated and softened, the sealing of the softened edge 46 to create the ring flange 18 is made easier. In FIG. 10, the sealing ring 37 is shown in its lower position after the preform ring 50 has finished the folding work.

The membrane 38 shown with black lines (see also FIG. 6) is likewise arranged in the sealing ring 37, specifically above behind the preform ring 50 (FIG. 10). This membrane surrounds the tool 22 in a ring shape. In the area of the preform ring 50 and the sealing ring 37, the tool 22 is in the shape of a cylinder jacket on the outside with the longitudinal central axis 5 in the center. The sealing ring 37 and the preform ring 50 are adapted to the latter on the side facing the tool 22 and accordingly also in the form of a cylinder jacket. The membrane 38 lies with its ring-shaped, active inner part in this cylindrical jacket-shaped surface 53. Radially outwards, the membrane 38 is clamped to the preform ring 50 and encompasses air lines 54 which, for example, consist of a plurality of lines arranged radially and in a ring shape behind the active front surface of the membrane 38 open. If, for example, compressed air is introduced through the connection 55 into the lines 54, this presses the active front surface of the membrane 38 radially inwards, perpendicularly onto the outer surface of the ring flange 18 of the head part 4, which is thus firmly pressed on to form the gas-tight ring seam. Through a valve, not shown, the compressed air at port 55 can be switched to negative pressure (vacuum), so that the membrane 38 is retracted radially and the sealing ring 37 is again freely movable relative to the head part 4 and in the direction of the longitudinal central axis 5 against the direction of the arrow 52 is moved upwards.

The fastening mandrel 26 is now rotated with the aid of the gear 27 and the collar, including the head part 4 and side walls 5, is removed from the mold.

The base 3 shown in FIG. 4 is produced in a very similar manner. FIG. 11 shows the molding tool 56 with an annular depression 57 for the production of the bead. A blank 23c in the form of a flat, circular disk made of plastic is placed on the flat end face of the molding tool 56. The sealing ring 37a is constructed very similarly to the device for the production of the head part 4, so that a new description is unnecessary. According to FIG. 12, a switched-on heater 31a is arranged over the blank 23c. The material softens and partially lies in the annular depression 57 of the molding tool 56.

FIG. 13 shows the position in which the blank 23c is formed into its final deep-drawn shape by the application of vacuum to suction openings (not shown). Here too, after the deep-drawing process of the base 3, the radially outer edges 46a are heated up to the sealing temperature, which is why they are shown hanging slightly downward towards the rear.

The base is now ready for attachment to the sleeve-shaped side walls 2 according to FIG. 14. The sealing ring 37a moves in the direction of the arrow 52a parallel to the longitudinal central axis 5 vertically upwards and folds over the outer edge 46a to form the ring flange 13 in the manner of an ironing process on the surface of the side walls 2. The line 54a is pressurized so that the membrane 38a presses radially perpendicularly onto the ring flange 13 and seals the base 3 reliably, precisely and firmly on the side wall 2. After switching to vacuum, the membrane 38a retracts radially outward again and releases the side wall 2 together with the bottom 3 that has been raised.

In order that the lower edge 58 of the ring flange 18 shown in FIGS. 1 and 10 becomes smooth and straight, a form ring, not shown, can be attached to the cassette (not shown in FIGS. 10 and 14) for holding the sleeve 20 so that it can move relative to the cassette Folding the soft outer edge 46 of the head part 4 and 46a of the base 3 vertically outwards against this end part 3, 4 and pushes it in such a way that this edge 58 becomes straight or comes to lie in one plane.

Claims

Patent claims 1. Packaging for flowable filling goods with sleeve-shaped side walls (2) with a first plastic material and with a bottom (3) and an upwardly protruding pouring and closing device (7) having a head part (4) which can be sealed with a first plastic material , second plastic material exist characterized in that the unfilled package (1) is closed gas-tight on all sides, the pouring and closing device (7) has a collar (8) with an external thread (9) which can be closed with a screw cap, and the head part (4) is tapered towards the top. 2. Packaging according to claim 1, characterized in that the head part (4) in plan view has at least one stiffening ring (6, 11, 12) encompassing the collar (8). 3. Vβφackung according to claim 1 or 2, characterized in that the free end of the collar (8) is provided with a closed, raised edge (10) and that preferably the sleeve-shaped side walls (2) have a longitudinal sealing seam. 4. Packaging according to one of claims 1 to 3, characterized in that the head part (4) is curved outwards, the collar (8) is arranged in the middle and preferably the head part (4) with the aid of an annular flange (18) the top edge (19) of the side walls (2) is sealed. 5. Packaging according to one of claims 1 to 4, characterized in that the bottom (3) near its outer edge (46, a) has a bead (14). 6. A method for producing a packaging (1) for flowable filling goods with sleeve-shaped side walls (2) with a first plastic material and with a bottom (3) and a pouring and closing device (7) projecting upwards and having a head part (4) which consist of a second plastic material which can be sealed with the first plastic material, a disk-shaped blank (23, 23c) being preheated, shaped into the shape of the head part (4) or bottom (3) by deep drawing and onto the end edge (19) the sleeve-shaped side walls (2) having a longitudinal central axis (5) are sealed, characterized in that the respective blank (23, 23c) held by vacuum (in 24 ', 25'), next to the holding areas (24 ', 25') heated to thermoforming temperature, deep-drawn by vacuum and placed on the respective end edge (19) of the empty sleeve (20) and that the edge thereafter (46, 46a) of the blank (23, 23c) is folded around the edge (19) of the sleeve (20) and sealed with pressure. 7. The method according to claim 6, characterized in that for deep-drawing the head part (4), a first, preferably annular holding region (25 ') engages around the central region (23') of the blank (23) for the manufacture of the collar (8) and this Center area (23 ') is first deep-drawn, while a second holding area (24') holds the disc-shaped blank (23) further out and that the annular surface (23b) between the first and second holding area (25 ', 24') after deep-drawing the Collar (8) is deep drawn. 8. The method according to claim 6 or 7, characterized in that after the deep-drawing of the collar (8) of the central region (23 ') of the blank (23) with the collar (8) in the direction (39) of the longitudinal central axis (5) from the Level of the remaining blank (23) is withdrawn. 9. The method according to any one of claims 6 to 8, characterized in that during the deep-drawing of the area (23 ', 23b) of the blank (23, 23c) located more towards the center (5), the more outside area ( 23b, 46) is heated. 10. Apparatus for producing a packaging for flowable fillings with sleeve-shaped side walls (2) with a first plastic material and with a bottom (3) and an upwardly projecting pouring and closing device (7) having a head part (4) which consists of a the second plastic material, which can be sealed with the first plastic material, characterized in that a fixing dome (26) is rotatable and translational about a longitudinal central axis (5) in its direction (39) relative to a mandrel (26) encompassing and having an inner mold surface (21) , Tool (22) provided with suction openings (24, 25) is movably driven and carries a threaded form (30) radially within the inner mold surfaces (21), the inner mold surface (21) towards the end face (20) of the tool (22) opens 11. The device according to claim 10, characterized in that the tool (22) an outside of the mold inner surface (21) arranged first ring of suction openings (24) and on the outside next to the inner surface of the thread form (30) a second ring of suction openings (25) is attached and that preferably in the distance between the first and second (24, 25) a third ring of suction openings (45) on the Mold inner surface (21) opens out 12. The apparatus of claim 10 or 11, characterized in that a tool (22) encompassing sealing ring (37) in the direction of the longitudinal central axis (5) relative to the tool (22) is arranged to be linearly movable and one on the end face (20) of the Tool (22) adjacent preform ring (50) carries. 13. Device according to one of claims 10 to 12, characterized in that the tool (22) in the region of the preform ring (50) is in the form of a cylinder jacket with the longitudinal central axis (5) in the center, that the preform ring (50) on the inside of the tool ( 22) is adapted and in the annular surface (53) carries a preferably pneumatically movable driven membrane (38) made of an elastomer. 14. Device according to one of claims 10 to 13, characterized in that a shaped ring is attached to the cassette for holding the sleeve (20), which is movable in the direction of the longitudinal central axis (5) relative to the cassette and the sleeve (20) .