WO1997029018A2 - Emballage pour produits coulants, et procede et dispositif de production d'un tel emballage - Google Patents

Emballage pour produits coulants, et procede et dispositif de production d'un tel emballage Download PDF

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Publication number
WO1997029018A2
WO1997029018A2 PCT/EP1996/005271 EP9605271W WO9729018A2 WO 1997029018 A2 WO1997029018 A2 WO 1997029018A2 EP 9605271 W EP9605271 W EP 9605271W WO 9729018 A2 WO9729018 A2 WO 9729018A2
Authority
WO
WIPO (PCT)
Prior art keywords
ring
blank
sleeve
head part
collar
Prior art date
Application number
PCT/EP1996/005271
Other languages
German (de)
English (en)
Inventor
Roland Gerke
Hans Kindinger
Original Assignee
Tetra Laval Holdings & Finance S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Priority to AU10666/97A priority Critical patent/AU1066697A/en
Publication of WO1997029018A2 publication Critical patent/WO1997029018A2/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D11/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material
    • B65D11/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material of curved cross-section
    • B65D11/04—Bottles or similar containers with necks or like restricted apertures designed for pouring contents

Definitions

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a pack partially produced at very high temperatures is largely germ-free and remains so even if it is gas-tight on all sides after manufacture and before filling.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the head part is curved outwards
  • the collar is arranged in the middle
  • 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.
  • the base has a bead near its outer edge.
  • 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.
  • 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.
  • a foamed plastic for example foamed polypropylene.
  • 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.
  • 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.
  • a first plastic material for example polypropylene
  • 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 s
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • front 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.
  • 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.
  • first ring of openings for mothers 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the sleeve-shaped side walls 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.
  • this air heats up over time and creates an overpressure which prevents the outer surfaces of the packaging from bulging inwards.
  • this overpressure can also be understood as a pressure equalization to the environment, which can prevent this indentation.
  • 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.
  • 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.
  • FIG. 1 shows the side view of a packaging that can be produced according to the invention
  • FIG. 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
  • Figure 6 is the same view as Figure 5, but schematically in front under the
  • FIGS. 7-9 are views similar to FIG. 6, but with different thermoforming
  • Figure 10 shows the device in a state similar to that in Figure 9, but with the
  • 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
  • Figure 13 is a view similar to Figure 12, showing the heating of the bottom of the
  • Figure 14 shows an operating state similar to Figure 10, wherein the outer edges of the
  • 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.
  • 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.
  • 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.
  • a raised edge 10 which is circular in plan view in the direction of the longitudinal central axis 5.
  • 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.
  • 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.
  • FIGS. 5 to 10 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.
  • 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 * .
  • a mounting mandrel 26 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.
  • 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.
  • 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.
  • 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
  • the collar 8 is readily possible and without tearing off the annular holding area 24 'between the blank 23 and the tool 22.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • the membrane 38 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.
  • 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
  • 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.
  • 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.
  • 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).
  • 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.
  • the membrane 38a retracts radially outward again and releases the side wall 2 together with the bottom 3 that has been raised.
  • a form ring 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un emballage pour produits coulants, comprenant des parois latérales (2) en forme de douilles, constituées d'une première matière plastique, et un fond (3) et une tête (4) présentant un dispositif de déversement et de fermeture (7), ledit fond et ladite tête étant constitués d'une seconde matière plastique pouvant être soudée à la première. Pour qu'il soit possible de produire à meilleur marché un tel emballage, pourvu en outre d'une fermeture filetée, il est proposé, selon l'invention, que l'emballage (1) non rempli soit complètement étanche aux gaz, que le dispositif de déversement et de fermeture (7) présente un col (8) pourvu d'un filetage extérieur (9) et pouvant être fermé au moyen d'un bouchon fileté, et que la tête (4) se rétrécisse vers le haut.
PCT/EP1996/005271 1996-02-08 1996-11-28 Emballage pour produits coulants, et procede et dispositif de production d'un tel emballage WO1997029018A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10666/97A AU1066697A (en) 1996-02-08 1996-11-28 Packaging for flowable products and process and device for producing said packaging

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996104528 DE19604528A1 (de) 1996-02-08 1996-02-08 Fließmittelpackung und Verfahren sowie Vorrichtung zur Herstellung einer solchen Verpackung
DE19604528.2 1996-02-08

Publications (1)

Publication Number Publication Date
WO1997029018A2 true WO1997029018A2 (fr) 1997-08-14

Family

ID=7784816

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/005271 WO1997029018A2 (fr) 1996-02-08 1996-11-28 Emballage pour produits coulants, et procede et dispositif de production d'un tel emballage

Country Status (3)

Country Link
AU (1) AU1066697A (fr)
DE (1) DE19604528A1 (fr)
WO (1) WO1997029018A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006036137A1 (de) * 2006-07-28 2008-01-31 Q-Bag Packaging Machinery Gmbh & Co. Kg Verpackungsbehälter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981000009A1 (fr) * 1979-06-22 1981-01-08 Yoshino Kogyosho Co Ltd Bouteille en resine de polyester saturee avec patte de support
DE3001478C2 (de) * 1980-01-17 1984-05-17 4 P Nicolaus Kempten GmbH, 8960 Kempten Vorrichten zum flüssigkeitsdichten Verschliessen eines Behälters, Zuschnitt zum Herstellen des Behälters und daraus hergestellter Behälter
SE8105778L (sv) * 1981-09-30 1983-03-31 Cerbo Ab Forpackning samt sett att tillverka densamma
EP0108166A1 (fr) * 1982-10-22 1984-05-16 Shikoku Kakoki Co., Ltd. Conteneur
DE3926820A1 (de) * 1988-08-13 1990-02-15 Bernd Buedenbender Spundbehaelter
DE4207997A1 (de) * 1991-10-22 1993-04-29 Doemling Juergen Behaelter aus kunststoff

Also Published As

Publication number Publication date
AU1066697A (en) 1997-08-28
DE19604528A1 (de) 1997-08-14

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