EP0096826B1 - Method for the manufacture of a package for fluid materials - Google Patents

Method for the manufacture of a package for fluid materials Download PDF

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Publication number
EP0096826B1
EP0096826B1 EP83105578A EP83105578A EP0096826B1 EP 0096826 B1 EP0096826 B1 EP 0096826B1 EP 83105578 A EP83105578 A EP 83105578A EP 83105578 A EP83105578 A EP 83105578A EP 0096826 B1 EP0096826 B1 EP 0096826B1
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EP
European Patent Office
Prior art keywords
edge
tube
side walls
pack
tool
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
EP83105578A
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German (de)
French (fr)
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EP0096826A1 (en
Inventor
Wilhelm Reil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
Tetra Pak Finance and Trading SA
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Application filed by Tetra Laval Holdings and Finance SA, Tetra Pak Finance and Trading SA filed Critical Tetra Laval Holdings and Finance SA
Priority to AT83105578T priority Critical patent/ATE40077T1/en
Publication of EP0096826A1 publication Critical patent/EP0096826A1/en
Application granted granted Critical
Publication of EP0096826B1 publication Critical patent/EP0096826B1/en
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    • 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing

Definitions

  • the invention relates to a method for producing a plasticiser pack, consisting of side walls and end walls connected to one another via at least one longitudinal sealing seam, which are attached to the ends of a tube with a circular cross section and form the bottom and lid of the pack, the side walls being made of thermoplastic at least on one side Made of plastic-coated cardboard, the bottom of the pack is brought to a tool as a flat piece of wall and, together with the free edge of the side walls being flared by 20 ° to 40 ° against the vertical, is moved vertically towards the edge of the tube, then pressed onto the edge and the edge of the bottom is sealed onto the edge of the tube, after which the tool is removed, and finally the sealed edges of the side wall and bottom are raised again to the vertical.
  • Packs are currently on the market that are used in parallelepiped form for liquids, particularly milk and fruit juices.
  • the lid In a special known package, the lid consists of thermoplastic material without a carrier material and is injection molded along its outer edge on the side walls, wherein it has a pouring device that is folded into the outer contour of the package.
  • the opposite end wall which represents the bottom of this known pack, has triangular flaps folded over onto adjacent walls, because the bottom is designed as a so-called block bottom with a transverse sealing seam.
  • the cross-section of this block bottom is of course square, while the cross-section of the known packing is round in the area of the cover.
  • EP-A-74343 A method of the type described in the opening paragraph is known from EP-A-74343.
  • the package described there has a cylindrical tubular body made of cardboard, which is provided with a heat-sealable layer on at least one surface.
  • the finished container ultimately looks like a can.
  • Its end closure has an expanded flange which is pressed into the open end of the tube jacket by means of a press piston, which also has a conical peripheral surface.
  • the piston works together with a welding tool with a corresponding conical surface. Pressure on the piston makes the weldable layers plastically flowable. If the pressure piston with the lid or bottom moves down onto the tube, the welding takes place, which then hardens and becomes rigid.
  • the welding can also be carried out using high frequency or ultrasound.
  • the cardboard coated with plastic on the surfaces is open at the cut surfaces. If the known pack is used for the transport of liquids, there is already a "risk that liquid that has been partially spilled or that is lying on the cut edges for other reasons will penetrate them and cause the paper edges to swell, even during packaging and especially after opening and reclosing for the first time The package is consequently destroyed at the interfaces.
  • GB-A-1 014 085 also discloses a production method with the application of a flat bottom by means of flanging.
  • This British document describes containers made of plastic films such as those found in e.g. B. for the storage of condensed milk, oil sardines, etc., where the plastic can optionally also be coated with aluminum foil.
  • the person skilled in the art knows that there are considerable differences in the processing of coated paper on the one hand or plastics, even when they are laminated with aluminum foil, on the other hand, particularly in mass production.
  • a film web is drawn over an open tube, cut off, folded over, heated, welded and removed from the mold.
  • the lower outer edge - the welding stamp used there - hits the upper edge of the tube, processing errors can arise, in particular, in that the upper tube edge can inadvertently bend partially inwards.
  • cut paper is very at risk of moisture penetration at the interfaces, as explained above in connection with the other document. From the interfaces, swelling of the paper material poses considerable risks of destroying the package.
  • the invention is therefore based on the object of providing a production method for plasticizer packs of the type mentioned at the outset, in which a paper or cardboard tube can be reliably provided with a flat bottom in such a way that the cut edges of the paper are also protected against moisture.
  • the flaring mentioned takes place from the vertical to a more or less horizontal position, it being sufficient if a certain horizontal component is present. Bending back from the flanged position into the vertical is expedient if a package is desired in which the edge of the tubular side should ultimately stand up in the closed state. In the manufacturing process, flanging into the vertical also achieves a horizontal component for the outer support body, so that strong pressures can be applied during production to form a good sealing seam.
  • the edge of the tubular side walls can also be folded over on itself by 180 °. This results in a stiffening of the material of the side walls, so that even when using a plastic film as the base (without paper as the carrier material), a rigid edge and thus a secure packing are ensured.
  • the method according to the invention is preferably used to close a package which has already been provided with a lid and filled with the superplasticizer and was only open at its bottom end, which was to be closed with a dense and economically producible bottom.
  • a packing which is sealed according to the invention with a base, can be configured in a material-saving manner because the liquid level or that of the other flowable material can be set to a relatively high level below the upper edge of the tubular side walls. It is not necessary, as is the case with the known packs, to provide customary and material-consuming dead areas for the production of the block bottom.
  • the flaring is a bending of the edge of the side walls which initially stands up vertically into the horizontal, while the flanging is the turning of this edge from the vertical by 180 ° into the vertical on the opposite side of the side wall.
  • the advantage already mentioned above consists in the possibility of attaching outer support bodies which act as counterbrakes for a sealing jaw, so that all suitable materials can be connected along the abovementioned support or sealing surface. If, in the case of an intermediate product or another embodiment, the level of the base lies in the level of the edge which is initially flanged outwards into the horizontal, then the entire base surface bears forces. This results in excellent stability, which is even further improved by the fact that when the edge of the side walls is flared outwards, the standing surface, ie. H. the total area of the floor is larger than the area of the side walls themselves. So this is another embodiment with the edge horizontally outwards.
  • the method according to the invention is particularly advantageous if the flat wall piece for shaping the base is cut out so large that after the sealing of the two edges of the side wall and base, the circular edge of the base - for folding over the edge of the tube - over the edge of the side wall outstanding is provided.
  • This measure can also be used to protect and completely cover the peripheral edge against the ingress of moisture.
  • the base consists of a film formed from thermoplastic plastic, the outer edge of which is attached to the outer surface of the side walls. This process measure also serves to protect the edges, the inexpensive film being placed over the cut edge in a simple manner, bent down and tacked on.
  • edge which is initially open due to the cut through the coated paper is covered by the folding over of the edge parts, it is also advantageously possible to use non-waterproof paper, i.e. cheaper material, use.
  • non-waterproof paper i.e. cheaper material
  • the level of the bottom is arranged within the tubular side walls and transversely to them and the outwardly projecting circular edge of the bottom is laid over the free edge of the tube side walls by 180 ° and sealed on the outside, the suppleness of the material is used. This gives the edge reinforcement and strengthening at the same time.
  • the level of the base in this embodiment is not in the same plane as the free edge of the upstanding edge of the tubular side walls, the edge is so strong and stiffened by the folding over of the base edge that the edge can absorb the total load of the package without impairment and still a good stability of a package equipped with such a base is achieved.
  • a cover is only possible with a tool with an internal mandrel and surrounding parts, the machine parts as a whole having to be designed to be tightly sealed under high pressure. It goes without saying that a lid can only be injected onto an empty package. If you now want to spray a floor, the content here does not allow the use of comparatively complicated tools ge.
  • a pack can thus be produced in which the lid is made with the above-mentioned mandrel and surrounding part, but the bottom is welded according to the invention only by external support bodies and is nevertheless sealed.
  • the new base can therefore also be molded, injection-molded or sealed onto a filled package that is only closed on one side without a mandrel.
  • the pack which is preferably provided for liquids, has side walls 1 which consist of cardboard coated on both sides with thermoplastic material.
  • the filling material is not shown, but in the state of FIG. 1 can be assumed to be filled. Throughout the description, the package is assumed to be vertically upright with a circular cross-section.
  • the bottom is generally designated 2, which in the embodiment of FIG. 1 consists of a cardboard coated with thermoplastic.
  • the tubular side walls 1 have an upper edge 3 with an outer edge 4, and the bottom 2 also has an edge 5 with an outer edge 6. In the embodiment in FIG. 4, the edge 3 of the side walls 1 is 180 ° away from itself, specifically after outside, folded over.
  • the edge 3 of the tubular side walls 1 is flanged from the vertical into the horizontal after sealing with the bottom 2.
  • the outer edge 5 of the base 2 is placed around the free outer edge 4 of the flanged edge 3 of the side walls 1 by 180 °.
  • the outer edge 4 is covered, and the outer edge 6 of the base 2 is at most critical if the base is not made of plastic without a base material but is provided with base material which is not waterproof.
  • the edge 5 can then be provided with incisions which run approximately radially and ultimately result in a tooth shape on the periphery of the finished cut of the base 2.
  • This edge 5 with the incisions protrudes radially beyond the flanged edge 3 of the side walls 1 in the manner shown in FIG. 2, in order then to be placed around the side wall edge 3 by 180 °, so that the state shown in FIG. 3 is achieved.
  • FIG. 4 shows a base 2 made of pure plastic film without a carrier material.
  • the edge 3 of the side wall 1 is also flanged over itself by 180 °, the edge 5 of the base 2 protrudes beyond the outer edge 4 and is attached to the outer surface of the side walls 1.
  • a strong stiffening of the edge is already achieved on the side walls. Due to this rigidity, pressing on with the film as the base 2 is sufficient with heat without counter-baking in order to achieve a perfectly liquid-tight sealing.
  • FIG. 1 The embodiment according to FIG. 1 is produced in such a way that, according to FIG. 2, the upper free edge 3 of the tubular side walls 1 is first flared outwards by a certain angle, preferably 20 ° to 40 °, in particular 30 °, relative to the vertical to achieve a horizontal component for the tools (counter pressure).
  • This flanging takes place with the tool 8 shown schematically in FIG. 2, which at the same time also supports the base 2, the edge 5 of which is set at the same angle with respect to the vertical.
  • the counter jaw is not shown, but it is easy for any person skilled in the art to see that this type of manufacture (FIG. 2) on the inside of the edge 3 can be achieved with a good sealing seam between the edges 3 and 5 by applying considerable pressure is not affected in any way if the flaring is lifted again by raising it vertically.
  • FIG. 1 shows the state of the floor design of this embodiment.
  • FIGS. 3 to 5 The schematic configuration of the edge is shown in FIGS. 3 to 5, as explained above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Making Paper Articles (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Cartons (AREA)

Abstract

1. A process for the production of a pack for a material capable of flow, comprising side walls (1) which are connected together in a tubular configuration by way of at least one longitudinal sealing seam and end walls (2) which are applied to the ends of a tube which is of round cross-section and form the bottom (2) and the top of the pack, wherein the side walls (1) comprise cardboard which is coated at least on one side with thermoplastic material, the bottom (2) of the pack as a flat wall portion is disposed on a tool (8) and together with same moved vertically towards the edge (3) of the tube, with the free edge (3) or the side walls (1) being flanged out by 20 degrees to 40 degrees relative to the vertical, it is thereupon pressed on to the edge (3) and the edge (5) of the bottom (2) is sealed on to the edge (3) of the tube, thereupon the tool (8) is withdrawn, and wherein finally the sealed edges (3, 5) of the side wall (1) and the bottom (2) are raised into the vertical again, characterised in that, after the edge (5) of the bottom has been sealed on to the edge (3) of the tube, when the tool (8) is withdrawn, the outer edge (5) of the bottom (2) is laid over around the free edge face (4) of the side edge (3) and is laid over through 180 degrees relative to the inward side outwardly on to the outside surface of the side wall (1) and is welded there.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Fliessmittelpackung, bestehend aus miteinander über mindestens eine Längssiegelnaht tubusförmig verbundenen Seitenwänden und Stirnwänden, die an den Enden eines im Querschnitt kreisrunden Tubus angebracht sind sowie Boden und Deckel der Packung bilden, wobei die Seitenwände aus mindestens einseitig mit thermoplastischem Kunststoff beschichtetem Karton bestehen, der Boden der Packung als ebenes Wandstück an ein Werkzeug gebracht und zusammen mit diesem - unter Aufbördeln des freien Randes der Seitenwände um 20° bis 40° gegen die Vertikale - vertikal auf den Tubusrand zubewegt wird, danach auf den Rand aufgedrückt und der Rand des Bodens auf den Tubusrand aufgesiegelt wird, danach das Werkzeug abgezogen wird und wobei schliesslich die versiegelten Ränder von Seitenwand und Boden wieder in die Vertikale hochgestellt werden.The invention relates to a method for producing a plasticiser pack, consisting of side walls and end walls connected to one another via at least one longitudinal sealing seam, which are attached to the ends of a tube with a circular cross section and form the bottom and lid of the pack, the side walls being made of thermoplastic at least on one side Made of plastic-coated cardboard, the bottom of the pack is brought to a tool as a flat piece of wall and, together with the free edge of the side walls being flared by 20 ° to 40 ° against the vertical, is moved vertically towards the edge of the tube, then pressed onto the edge and the edge of the bottom is sealed onto the edge of the tube, after which the tool is removed, and finally the sealed edges of the side wall and bottom are raised again to the vertical.

Es sind Packungen derzeit auf dem Markt, die in parallelepipedischer Form für Flüssigkeiten, insbesondere Milch und Fruchtsäfte, benutzt werden.Packs are currently on the market that are used in parallelepiped form for liquids, particularly milk and fruit juices.

Bei einer speziellen bekannten Packung besteht der Deckel aus thermoplastischem Kunststoff ohne Trägermaterial und ist längs seiner Aussenkante an den Seitenwänden angespritzt, wobei er eine nach innerhalb der Aussenkontur der Packung eingeklappte Ausgiesseinrichtung aufweist. Hingegen besitzt die gegenüberliegende, den Boden dieser bekannten Packung darstellende Stirnwand auf benachbarte Wandungen umgefaltete Dreiecklappen, weil der Boden als sogenannte Klotzboden mit einer Quersiegelnaht ausgebildet ist. Der Querschnitt dieses Klotzbodens ist selbstverständlich viereckig, während der Querschnitt der bekannten Packung im Bereich des Deckels rund ist.In a special known package, the lid consists of thermoplastic material without a carrier material and is injection molded along its outer edge on the side walls, wherein it has a pouring device that is folded into the outer contour of the package. On the other hand, the opposite end wall, which represents the bottom of this known pack, has triangular flaps folded over onto adjacent walls, because the bottom is designed as a so-called block bottom with a transverse sealing seam. The cross-section of this block bottom is of course square, while the cross-section of the known packing is round in the area of the cover.

Es ist bisweilen erwünscht, steifere Packungen zu erhalten, wobei vorzugsweise ein dickerer Packstoff verwendet wird, d.h. ein dickeres Trägermaterial, dickerer Karton. Durch die Knick-und Faltstellen kann dann aber im Bereich des Bodens die Gefahr der Leckage entstehen. Ausserdem hat sich der Erfinder überlegt, dass die zur Erstellung des Klotzbodenverschlusses notwendigen toten Flächen der Faltung einen Materialverbrauch darstellen, der möglicherweise eingespart werden könnte. Verbessert werden könnte im übrigen auch die Form der bekannten Pakkung im Bodenbereich dadurch, dass die durch die Klotzbodenfaltung entstehende Volumenverkleinerung überwunden werden könnte.It is sometimes desirable to obtain stiffer packages, preferably using a thicker packaging material, i.e. a thicker carrier material, thicker cardboard. The kinks and folds can then cause the risk of leakage in the area of the floor. In addition, the inventor has considered that the dead areas of the fold necessary to create the block bottom closure represent a material consumption that could possibly be saved. Incidentally, the shape of the known packing in the floor area could also be improved in that the volume reduction resulting from the block bottom folding could be overcome.

Ein Verfahren der eingangs bezeichneten Art ist aus der EP-A-74343 bekannt. Die dort beschriebene Packung weist einen zylindermantelförmigen Tubuskörper aus Karton auf, der mindestens auf einer Oberfläche mit einer heisssiegelfähigen Schicht versehen ist. Der fertige Behälter sieht letztlich wie eine Dose aus. Deren Endverschluss weist einen ausgeweiteten Flansch auf, der in das offene Ende des Tubusmantels mittels einen Presskolbens gedrückt wird, der auch eine konische Umfangsoberfläche hat. Der Kolben arbeitet mit einem Schweisswerkzeug mit entsprechender konischer Oberfläche zusammen. Durch den Druck auf den Kolben werden die schweissfähigen Schichten plastisch fliessfähig gemacht. Fährt der Druckkolben mit dem Deckel oder Boden auf den Tubus nach unten, dann erfolgt die Schweissung, die danach ausgehärtet und steif wird. Das Schweissen kann auch mittels Hochfrequenz oder Ultraschall durchgeführt werden.A method of the type described in the opening paragraph is known from EP-A-74343. The package described there has a cylindrical tubular body made of cardboard, which is provided with a heat-sealable layer on at least one surface. The finished container ultimately looks like a can. Its end closure has an expanded flange which is pressed into the open end of the tube jacket by means of a press piston, which also has a conical peripheral surface. The piston works together with a welding tool with a corresponding conical surface. Pressure on the piston makes the weldable layers plastically flowable. If the pressure piston with the lid or bottom moves down onto the tube, the welding takes place, which then hardens and becomes rigid. The welding can also be carried out using high frequency or ultrasound.

Der auf den Oberflächen mit Kunststoff beschichtete Karton ist an den Schnittflächen jeweils offen. Wird die bekannte Packung für den Transport von Flüssigkeiten verwendet, dann besteht schon beim Verpacken und erst recht nach dem erstmaligen Öffnen und Wiederverschliessen die" Gefahr, dass teilweise verschüttete oder aus anderen Gründen auf den Schnittkanten liegende Flüssigkeit in diese eindringt und die Papierränder zum Quellen bringt. Die Packung wird folglich an den Schnittstellen zerstört.The cardboard coated with plastic on the surfaces is open at the cut surfaces. If the known pack is used for the transport of liquids, there is already a "risk that liquid that has been partially spilled or that is lying on the cut edges for other reasons will penetrate them and cause the paper edges to swell, even during packaging and especially after opening and reclosing for the first time The package is consequently destroyed at the interfaces.

Auch aus der GB-A-1 014 085 ist ein Herstellungsverfahren mit Anbringung eines flachen Bodens mittels Aufbördeln bekannt. Dieses britische Dokument beschreibt Behälter aus Kunststoffilmen, wie sie z. B. zur Aufbewahrung von kondensierter Milch, Ölsardinen usw. Verwendung finden, wobei der Kunststoff gegebenenfalls auch mit Aluminiumfolie beschichtet sein kann. Der Fachmann weiss aber, dass gerade bei der Massenproduktion erhebliche Unterschiede bei der Verarbeitung von beschichtetem Papier einerseits oder Kunststoffen, auch wenn sie mit Aluminiumfolie kaschiert sind, andererseits bestehen.GB-A-1 014 085 also discloses a production method with the application of a flat bottom by means of flanging. This British document describes containers made of plastic films such as those found in e.g. B. for the storage of condensed milk, oil sardines, etc., where the plastic can optionally also be coated with aluminum foil. However, the person skilled in the art knows that there are considerable differences in the processing of coated paper on the one hand or plastics, even when they are laminated with aluminum foil, on the other hand, particularly in mass production.

Nach dem britischen Dokument wird eine Folienbahn über einen offenen Tubus gezogen, abgeschnitten, umgelegt, erwärmt, verschweisst und entformt. Beim Auftreffen des unteren äusseren Randes -des dort verwendeten Schweissstempels auf die Oberkante des Tubus können Verarbeitungsfehler insbesondere dadurch entstehen, dass der obere Tubusrand unbeabsichtigt teilweise nach innen knicken kann. Ausserdem weiss der Fachmann, dass geschnittenes Papier an den Schnittstellen gegenüber eindringender Feuchtigkeit sehr gefährdet ist, wie vorstehend im Zusammenhang mit dem anderen Dokument erläutert wurde. Von den Schnittstellen aus bestehen durch das Quellen des Papiermaterials erhebliche Gefahren der Zerstörung der Packung.According to the British document, a film web is drawn over an open tube, cut off, folded over, heated, welded and removed from the mold. When the lower outer edge - the welding stamp used there - hits the upper edge of the tube, processing errors can arise, in particular, in that the upper tube edge can inadvertently bend partially inwards. In addition, the person skilled in the art knows that cut paper is very at risk of moisture penetration at the interfaces, as explained above in connection with the other document. From the interfaces, swelling of the paper material poses considerable risks of destroying the package.

Der Stand der Technik zeigt keine Massnahmen, wie die Schnittstellen bei mit Kunststoff flächig beschichtetem Papier als Trägermaterial der Pakkung geschützt werden könnten.The prior art shows no measures as to how the interfaces could be protected in the case of paper coated with plastic as the carrier material of the package.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Herstellungsverfahren für Fliessmittelpakkungen der eingangs bezeichneten Art zu schaffen, bei welchem ein Papier- bzw. Kartontubus mit einem flachen Boden zuverlässig so versehen werden kann, dass auch die Schnittkanten des Papiers gegen Feuchtigkeit geschützt sind.The invention is therefore based on the object of providing a production method for plasticizer packs of the type mentioned at the outset, in which a paper or cardboard tube can be reliably provided with a flat bottom in such a way that the cut edges of the paper are also protected against moisture.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass nach dem Aufsiegeln des Bodenrandes auf den Tubusrand beim Abziehen des Werkzeuges der Aussenrand des Bodens über die freie Kante des Seitenrandes umgelegt und um 180° gegenüber der Innenseite nach aussen auf die Aussenfläche der Seitenwand umgelegt und dort verschweisst wird. Das Umlegen des Bodenaussenrandes um den Seitenrand des Tubus deckt die durch den Schnitt freigelegte Papierfläche ab, so dass die Flüssigkeit keine Möglichkeit hat, in das ungeschützte Papier einzudringen und dieses zu beschädigen, denn der Rand des Bodens ist aussen auf die Seitenwand gelegt und dort angeheftet.This object is achieved according to the invention in that after the bottom edge has been sealed onto the tube edge when the tool is pulled off, the outer edge of the bottom extends over the free one Edge of the side edge folded over and turned 180 ° outwards against the outside surface of the side wall and welded there. Folding the outer edge of the base around the side edge of the tube covers the paper surface exposed by the cut, so that the liquid has no way of penetrating into the unprotected paper and damaging it, because the edge of the base is placed on the outside of the side wall and attached there .

Das erwähnte Aufbördeln erfolgt aus der vertikalen in eine mehr oder weniger horizontale Position, wobei es genügt, wenn eine gewisse Horizontalkomponente vorhanden ist. Das Zurückbiegen aus der aufgebördelten Position in die Vertikale ist zweckmässig, wenn eine Packung gewünscht wird, bei der letztlich im verschlossenen Zustand der Rand der tubusförmigen Seite hochstehen soll. Beim Herstellungsverfahren erreicht man durch das Aufbördeln in die Vertikale auch eine Horizontalkomponente für äussere Stützkörper, so dass bei der Herstellung starke Drücke zur Ausbildung einer guten Siegelnaht aufgebracht werden können.The flaring mentioned takes place from the vertical to a more or less horizontal position, it being sufficient if a certain horizontal component is present. Bending back from the flanged position into the vertical is expedient if a package is desired in which the edge of the tubular side should ultimately stand up in the closed state. In the manufacturing process, flanging into the vertical also achieves a horizontal component for the outer support body, so that strong pressures can be applied during production to form a good sealing seam.

Man kann auch den Rand der tubusförmigen Seitenwände um 180° auf sich selbst umfalten. Dadurch erreicht man nämlich eine Versteifung des Materials der Seitenwände, so dass selbst bei Verwendung einer Kunststoffolie als Boden (ohne Papier als Trägermaterial) ein steifer Rand und damit eine sichere Packung gewährleistet sind.The edge of the tubular side walls can also be folded over on itself by 180 °. This results in a stiffening of the material of the side walls, so that even when using a plastic film as the base (without paper as the carrier material), a rigid edge and thus a secure packing are ensured.

Vorzugsweise wird mit dem erfindungsgemässen Verfahren eine Packung verschlossen, die bereits mit einem Deckel versehen und mit dem zu verpackenden Fliessmittel gefüllt war und lediglich noch an ihrem bodenseitigen Ende offen war, welches mit einem dichten und wirtschaftlich erstellbaren Boden verschlossen werden sollte. Man kann eine solche, mit einem Boden erfindungsgemäss verschlossene Packung materialsparend ausgestalten, weil der Flüssigkeitsspiegel oder auch der des anderweitigen fliessfähigen Materials bis verhältnismässig hoch unter den oberen Rand der tubusförmigen Seitenwände eingestellt werden kann. Es brauchen nicht wie bei den bekannten Packungen für die Erstellung des Klotzbodens übliche und materialverbrauchende tote Flächen vorgesehen werden.The method according to the invention is preferably used to close a package which has already been provided with a lid and filled with the superplasticizer and was only open at its bottom end, which was to be closed with a dense and economically producible bottom. Such a packing, which is sealed according to the invention with a base, can be configured in a material-saving manner because the liquid level or that of the other flowable material can be set to a relatively high level below the upper edge of the tubular side walls. It is not necessary, as is the case with the known packs, to provide customary and material-consuming dead areas for the production of the block bottom.

Das Aufbördeln ist ein Umbiegen des zunächst in der Vertikalen hochstehenden Randes der Seitenwände in die Horizontale, während das Umbördein das Herumlegen dieses Randes von der Vertikalen um 180° in die Vertikale auf der gegenüberliegenden Seite der Seitenwand ist. Der oben bereits erwähnte Vorteil besteht in der Ansatzmöglichkeit äusserer Stützkörper, die als Gegenbakken für eine Siegelbacke wirken, so dass alle geeigneten Materialien längs der genannten Auflage- bzw. Versiegelungsfläche verbunden werden können. Liegt bei einem Zwischenprodukt oder einer anderen Ausführungsform die Ebene des Bodens in der Ebene des zunächst nach aussen in die Horizontale aufgebördelten Randes, dann trägt die gesamte Bodenfläche aufliegende Kräfte mit. Hierdurch ergibt sich eine hervorragende Standfestigkeit, die sogar noch dadurch verbessert wird, dass beim Aufbördeln des Randes der Seitenwände nach aussen die Standfläche, d. h. die Gesamtfläche des Bodens, gegenüber der Fläche der Seitenwände selbst vergrössert ist. Dies ist also eine andere Ausführungsform mit dem Rand horizontal nach aussen.The flaring is a bending of the edge of the side walls which initially stands up vertically into the horizontal, while the flanging is the turning of this edge from the vertical by 180 ° into the vertical on the opposite side of the side wall. The advantage already mentioned above consists in the possibility of attaching outer support bodies which act as counterbrakes for a sealing jaw, so that all suitable materials can be connected along the abovementioned support or sealing surface. If, in the case of an intermediate product or another embodiment, the level of the base lies in the level of the edge which is initially flanged outwards into the horizontal, then the entire base surface bears forces. This results in excellent stability, which is even further improved by the fact that when the edge of the side walls is flared outwards, the standing surface, ie. H. the total area of the floor is larger than the area of the side walls themselves. So this is another embodiment with the edge horizontally outwards.

Dafür ist das erfindungsgemässe Verfahren besonders vorteilhaft, wenn das ebene Wandstück zur Formung des Bodens derart gross ausgeschnitten wird, dass nach dem Versiegeln der beiden Ränder von Seitenwand und Boden die Kreiskante des Bodens - zum Umlegen über die Randkante des Tubus - über den Rand der Seitenwand hinausragend vorgesehen wird. Auch durch diese Massnahme kann die Randkante gegen eindringende Feuchtigkeit geschützt und vollständig abgedeckt werden. Zweckmässig ist es auch, wenn der Boden aus einer aus thermoplastischem Kunststoff gebildeten Folie besteht, deren Aussenrand auf die Aussenfläche der Seitenwände angeheftet wird. Auch diese Verfahrensmassnahme dient dem Kantenschutz, wobei in einfacher Weise die preiswerte Folie über die Schnittkante gelegt, heruntergebogen und angeheftet wird.For this purpose, the method according to the invention is particularly advantageous if the flat wall piece for shaping the base is cut out so large that after the sealing of the two edges of the side wall and base, the circular edge of the base - for folding over the edge of the tube - over the edge of the side wall outstanding is provided. This measure can also be used to protect and completely cover the peripheral edge against the ingress of moisture. It is also expedient if the base consists of a film formed from thermoplastic plastic, the outer edge of which is attached to the outer surface of the side walls. This process measure also serves to protect the edges, the inexpensive film being placed over the cut edge in a simple manner, bent down and tacked on.

Im allgemeinen, wenn die durch den Schnitt durch das beschichtete Papier zunächst offene Kante durch das Umlegen der Randteile abgedeckt wird, kann man mit Vorteil auch nicht wasserfestes Papier, d.h. preiswerteres Material, einsetzen. Ausserdem ergibt sich beim Umlegen des Bodenrandes um die freie Aussenkante eine zusätzliche Steifigkeit der Packung, und man vermeidet einen radial nach aussen - bezogen auf den Tubus der Seitenwände - herausstehenden Rand, falls dies vom Verbraucher nicht gewünscht wird.In general, if the edge which is initially open due to the cut through the coated paper is covered by the folding over of the edge parts, it is also advantageously possible to use non-waterproof paper, i.e. cheaper material, use. In addition, when the bottom edge is folded around the free outer edge, there is an additional rigidity of the pack, and an edge which projects radially outwards - in relation to the tube of the side walls - is avoided if this is not desired by the consumer.

Wenn die Ebene des Bodens innerhalb der tubusförmigen Seitenwände und quer zu diesen angeordnet ist und der nach aussen vorstehende Kreisrand des Bodens über den freien Rand der Tubusseitenwände um 180° herumgelegt und aussen aufgesiegelt ist, nutzt man die Geschmeidigkeit des Materials aus. Dadurch erhält man gleichzeitig eine Verstärkung und Verfestigung des Randes. Zwar liegt die Ebene des Bodens bei dieser Ausführungsform nicht in derselben Ebene wie die freie Kante des hochstehenden Randes der tubusförmigen Seitenwände, der Rand ist aber durch das Umlegen des Bodenrandes so stark und versteift ausgebildet, dass der Rand die Gesamtlast der Packung ohne Beeinträchtigung aufnehmen kann und dennoch eine gute Standfestigkeit einer mit einem solchen Boden ausgestatteten Packung erreicht ist.If the level of the bottom is arranged within the tubular side walls and transversely to them and the outwardly projecting circular edge of the bottom is laid over the free edge of the tube side walls by 180 ° and sealed on the outside, the suppleness of the material is used. This gives the edge reinforcement and strengthening at the same time. Although the level of the base in this embodiment is not in the same plane as the free edge of the upstanding edge of the tubular side walls, the edge is so strong and stiffened by the folding over of the base edge that the edge can absorb the total load of the package without impairment and still a good stability of a package equipped with such a base is achieved.

Die Herstellung eines Deckels ist nur mit einem Werkzeug mit Innendorn und Umfassungsteilen möglich, wobei die Maschinenteile insgesamt unter hohem Druck dicht verschliessend ausgestaltet sein müssten. Es versteht sich, dass man einen Deckel nur an eine leere Packung anspritzen kann. Wünscht man nun auch das Anspritzen eines Bodens, so erlaubt der Inhalt hier nicht den Einsatz vergleichsweise komplizierter Werkzeuge. Erfindungskgemäss kann also eine Packung hergestellt werden, bei der zwar der Deckel mit dem vorstehend erwähnten Dorn und Umfassungsteil hergestellt ist, der Boden aber erfindungsgemäss nur durch äussere Stützkörper und dennoch dichtend verschweisst ist. Der neue Boden kann erfindungsgemäss also auch ohne Dorn an eine gefüllte und erst einseitig geschlossene Packung angeformt, angespritzt oder angesiegelt werden.The production of a cover is only possible with a tool with an internal mandrel and surrounding parts, the machine parts as a whole having to be designed to be tightly sealed under high pressure. It goes without saying that a lid can only be injected onto an empty package. If you now want to spray a floor, the content here does not allow the use of comparatively complicated tools ge. According to the invention, a pack can thus be produced in which the lid is made with the above-mentioned mandrel and surrounding part, but the bottom is welded according to the invention only by external support bodies and is nevertheless sealed. According to the invention, the new base can therefore also be molded, injection-molded or sealed onto a filled package that is only closed on one side without a mandrel.

Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden Erfindung ergeben sich aus der folgenden Beschreibung in Verbindung mit den Zeichnungen. Es zeigen:

  • Figur 1 die schematische und abgebrochene Ansicht einer bevorzugten Ausführungsform der erfindungsgemäss geschlossenen Packung mit innen tiefer gezogenem Boden, dessen Aussenrand um 180° über den Rand der Seitenwände umgelegt ist,
  • Figur 2 einen Herstellungszustand vor der Fertigstellung des Bodenverschlusses der Ausführungsform nach Figur 1 und
  • Figur 3 bis 5 abgebrochene Teilschnittansichten verschiedener Bodenverschlusseinrichtungen.
Further advantages, features and possible uses of the present invention result from the following description in conjunction with the drawings. Show it:
  • FIG. 1 shows the schematic and broken view of a preferred embodiment of the closed package according to the invention with the bottom drawn lower inside, the outer edge of which is folded over 180 ° over the edge of the side walls,
  • Figure 2 shows a state of manufacture before completion of the bottom closure of the embodiment of Figure 1 and
  • Figure 3 to 5 broken partial sectional views of different bottom closure devices.

Die vorzugsweise für Flüssigkeiten vorgesehene Packung hat Seitenwände 1, die aus beidseitig mit thermoplastischem Kunststoff beschichtetem Karton bestehen. Das Füllgut ist nicht dargestellt, ist im Zustand der Fig. 1 aber als eingefüllt anzunehmen. Bei der gesamten Beschreibung wird die Packung als vertikal hochstehend mit kreisrundem Querschnitt angenommen. Der Boden ist allgemein mit 2 bezeichnet, der bei der Ausführungsform der Fig. 1 aus einem mit thermoplastischem Kunststoff beschichteten Karton besteht. Die tubusförmigen Seitenwände 1 haben einen oberen Rand 3 mit einer Aussenkante 4, und auch der Boden 2 hat einen Rand 5 mit Aussenkante 6. Bei der Ausführungsform der Figur 4 ist der Rand 3 der Seitenwände 1 um 180° auf sich selbst, und zwar nach aussen, umgefaltet.The pack, which is preferably provided for liquids, has side walls 1 which consist of cardboard coated on both sides with thermoplastic material. The filling material is not shown, but in the state of FIG. 1 can be assumed to be filled. Throughout the description, the package is assumed to be vertically upright with a circular cross-section. The bottom is generally designated 2, which in the embodiment of FIG. 1 consists of a cardboard coated with thermoplastic. The tubular side walls 1 have an upper edge 3 with an outer edge 4, and the bottom 2 also has an edge 5 with an outer edge 6. In the embodiment in FIG. 4, the edge 3 of the side walls 1 is 180 ° away from itself, specifically after outside, folded over.

Bei der Ausführungsform der Fig. 3 ist der Rand 3 der tubusförmigen Seitenwände 1 nach der Versiegelung mit dem Boden 2 aus der Vertikalen in die Horizontale aufgebördelt. Der äussere Rand 5 des Bodens 2 ist um die freie Aussenkante 4 des aufgebördelten Randes 3 der Seitenwände 1 um 180° herumgelegt. Hierdurch ist die Aussenkante 4 abgedeckt, und die Aussenkante 6 des Bodens 2 ist allenfalls dann kritisch, wenn der Boden nicht aus Kunststoff ohne Trägermaterial sondern mit Trägermaterial, welches nicht wasserfest ist, versehen ist.In the embodiment of FIG. 3, the edge 3 of the tubular side walls 1 is flanged from the vertical into the horizontal after sealing with the bottom 2. The outer edge 5 of the base 2 is placed around the free outer edge 4 of the flanged edge 3 of the side walls 1 by 180 °. As a result, the outer edge 4 is covered, and the outer edge 6 of the base 2 is at most critical if the base is not made of plastic without a base material but is provided with base material which is not waterproof.

Wenn der Boden 2 ein beschichteter Karton ist, wie z.B. bei der Ausführungsform nach Fig. 3, dann kann der Rand 5 mit Einschnitten versehen werden, die etwa radial verlaufen und letztlich bei dem fertig bearbeiteten Zuschnitt des Bodens 2 an dessen Umfang eine Zahnform ergeben. Dieser Rand 5 mit den Einschnitten steht über den aufgebördelten Rand 3 der Seitenwände 1 in der in Figur 2 gezeigten Weise radial vor, um dann um 180° um den Seitenwandrand 3 herumgelegt zu werden, so dass der in Fig. 3 gezeigte Zustand erreicht wird.If the bottom 2 is a coated cardboard, e.g. in the embodiment according to FIG. 3, the edge 5 can then be provided with incisions which run approximately radially and ultimately result in a tooth shape on the periphery of the finished cut of the base 2. This edge 5 with the incisions protrudes radially beyond the flanged edge 3 of the side walls 1 in the manner shown in FIG. 2, in order then to be placed around the side wall edge 3 by 180 °, so that the state shown in FIG. 3 is achieved.

Die Ausführungsform der Fig. 4 zeigt einen Boden 2 aus reiner Kunststoffolie ohne Trägermaterial. Der Rand 3 der Seitenwand 1 ist zwar auch um 180° auf sich selbst umgebördelt, der Rand 5 des Bodens 2 ragt über die Aussenkante 4 hinaus und ist auf die Aussenfläche der Seitenwände 1 angeheftet. Hierdurch wird eine starke Versteifung des Randes schon an den Seitenwänden erreicht. Durch diese Steifigkeit genügt bei der Folie als Boden 2 das Aufdrücken mit Wärme ohne Gegenbacken, um ein einwandfrei flüssigkeitsdichtes Versiegeln zu erreichen.The embodiment of FIG. 4 shows a base 2 made of pure plastic film without a carrier material. The edge 3 of the side wall 1 is also flanged over itself by 180 °, the edge 5 of the base 2 protrudes beyond the outer edge 4 and is attached to the outer surface of the side walls 1. As a result, a strong stiffening of the edge is already achieved on the side walls. Due to this rigidity, pressing on with the film as the base 2 is sufficient with heat without counter-baking in order to achieve a perfectly liquid-tight sealing.

Die Ausführungsform nach Fig. 1 ist so hergestellt, dass gemäss Fig. 2 der obere freie Rand 3 der tubusförmigen Seitenwände 1 zunächst um einen gewissen Winkel nach aussen aufgebördelt wird, vorzugsweise 20° bis 40°, insbesondere 30°, gegenüber der Vertikalen, um hierdurch eine horizontale Komponente für die Werkzeuge (Gegendruck) zu erreichen. Dieses Aufbördeln geschieht mit dem schematisch in Fig. 2 gezeigten Werkzeug 8, welches gleichzeitig auch den Boden 2 trägt, dessen Rand 5 unter demselben Winkel gegenüber der Vertikalen angestellt wird. Der Gegenbacken ist nicht gezeigt, es ist aber leicht für jeden Fachmann ersichtlich, dass auf diese Art der Herstellung (Fig. 2) auf der Innenseite des Randes 3 unter Aufbringen eines erheblichen Druckes eine gute Siegelnaht zwischen den Rändern 3 und 5 erreichbar ist, die in keiner Weise beeinträchtigt wird, wenn die Aufbördelung durch Hochstellen in die Vertikale wieder aufgehoben wird.The embodiment according to FIG. 1 is produced in such a way that, according to FIG. 2, the upper free edge 3 of the tubular side walls 1 is first flared outwards by a certain angle, preferably 20 ° to 40 °, in particular 30 °, relative to the vertical to achieve a horizontal component for the tools (counter pressure). This flanging takes place with the tool 8 shown schematically in FIG. 2, which at the same time also supports the base 2, the edge 5 of which is set at the same angle with respect to the vertical. The counter jaw is not shown, but it is easy for any person skilled in the art to see that this type of manufacture (FIG. 2) on the inside of the edge 3 can be achieved with a good sealing seam between the edges 3 and 5 by applying considerable pressure is not affected in any way if the flaring is lifted again by raising it vertically.

Nach Abziehen des Werkzeuges 8 wird dann der Aussenrand 5 des Bodens 2 über die freie Kante 4 des Seitenwandrandes 3 umgelegt und um 180° gegenüber der Innenseite nach aussen auf die Aussenfläche der Seitenwände 1 umgelegt und dort verschweisst, so dass sich schliesslich der in Fig. 1 gezeigte Zustand der Bodenausgestaltung dieser Ausführungsform ergibt.After removal of the tool 8, the outer edge 5 of the base 2 is then folded over the free edge 4 of the side wall edge 3 and turned 180 ° with respect to the inside out onto the outer surface of the side walls 1 and welded there, so that finally the one shown in FIG. 1 shows the state of the floor design of this embodiment.

Vergrössert ist die schematische Ausbildung des Randes in den Fig. 3 bis 5 dargestellt, wie oben erläutert.The schematic configuration of the edge is shown in FIGS. 3 to 5, as explained above.

Claims (3)

1. A process for the production of a pack for a material capable of flow, comprising side walls (1) which are connected together in a tubular configuration by way of at least one longitudinal sealing seam and end walls (2) which are applied to the ends of a tube which is of round cross-section and form the bottom (2) and the top of the pack, wherein the side walls (1) comprise cardboard which is coated at least on one side with thermoplastic material, the bottom (2) of the pack as a flat wall portion is disposed on a tool (8) and together with same moved vertically towards the edge (3) of the tube, with the free edge (3) or the side walls (1) being flanged out by 20° to 40° relative to the vertical, it is thereupon pressed on to the edge (3) and the edge (5) of the bottom (2) is sealed on to the edge (3) of the tube, thereupon the tool (8) is withdrawn, and wherein finally the sealed edges (3, 5) of the side wall (1) and the bottom (2) are raised into the vertical again, characterised in that, after the edge (5) of the bottom has been sealed on to the edge (3) of the tube, when the tool (8) is withdrawn, the outer edge (5) of the bottom (2) is laid over around the free edge face (4) of the side edge (3) and is laid over through 180° relative to the inward side outwardly on to the outside surface of the side wall (1) and is welded there.
2. A process according to claim 1 characterised in that the flat wall portion, for forming the bottom (2), is cut out large in such a way that, after the operation of sealing the two edges (3, 5) of the side wall (1) and the bottom (2), the circular edge (6) of the bottom (2) - for laying it over around the edge face (4) - is arranged to project beyond the edge (3) of the side wall (1).
3. A process according to claim 1 or claim 2 characterised in that the bottom (2) comprises a foil formed from thermoplastic material.
EP83105578A 1982-06-12 1983-06-07 Method for the manufacture of a package for fluid materials Expired EP0096826B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83105578T ATE40077T1 (en) 1982-06-12 1983-06-07 PROCESS FOR MANUFACTURING A DEVELOPMENT PACKING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3222180 1982-06-12
DE3222180A DE3222180C2 (en) 1982-06-12 1982-06-12 Package for flowable filling goods and method for producing a bottom closure in this package

Publications (2)

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EP0096826A1 EP0096826A1 (en) 1983-12-28
EP0096826B1 true EP0096826B1 (en) 1989-01-18

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DE (2) DE3222180C2 (en)

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DE3601352A1 (en) * 1986-01-18 1987-07-23 Altstaedter Verpack Vertrieb PACKAGE FOR FLOWABLE FILLING PRODUCTS WITH GLASS WALLS
GB9616302D0 (en) * 1996-08-02 1996-09-11 Field Group Plc Tubular containers
DE102006032638B4 (en) * 2006-07-13 2010-11-11 Sig Technology Ag Cardboard / plastic composite package with peelable lid and method of making the same
DE102022202764A1 (en) 2022-03-21 2023-09-21 Sig Combibloc Services Ag LIQUID-TIGHT CONTAINER WITH WEDGE-SHAPED BOTTOM OR TOP SEAM

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Also Published As

Publication number Publication date
ATE40077T1 (en) 1989-02-15
DE3222180C2 (en) 1995-04-27
DE3222180A1 (en) 1983-12-15
EP0096826A1 (en) 1983-12-28
DE3378965D1 (en) 1989-02-23

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