EP0034997B1 - Closure cap for a container - Google Patents

Closure cap for a container Download PDF

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Publication number
EP0034997B1
EP0034997B1 EP81810029A EP81810029A EP0034997B1 EP 0034997 B1 EP0034997 B1 EP 0034997B1 EP 81810029 A EP81810029 A EP 81810029A EP 81810029 A EP81810029 A EP 81810029A EP 0034997 B1 EP0034997 B1 EP 0034997B1
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EP
European Patent Office
Prior art keywords
guarantee
closure cap
container
wall thickness
reinforcement
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Expired
Application number
EP81810029A
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German (de)
French (fr)
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EP0034997A1 (en
Inventor
Albert Obrist
Hans-Werner Breuer
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Albert Obrist AG
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Albert Obrist AG
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Application filed by Albert Obrist AG filed Critical Albert Obrist AG
Priority to AT81810029T priority Critical patent/ATE7589T1/en
Publication of EP0034997A1 publication Critical patent/EP0034997A1/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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
    • B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
    • B65D41/3461—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt the tamper element being retracted by heat or by heat and pressure
    • B65D41/3466—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt the tamper element being retracted by heat or by heat and pressure and being integrally connected to the closure by means of bridges
    • 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
    • B65D2401/00—Tamper-indicating means
    • B65D2401/15—Tearable part of the closure
    • B65D2401/30—Tamper-ring remaining connected to closure after initial removal
    • 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
    • B65D2401/00—Tamper-indicating means
    • B65D2401/15—Tearable part of the closure
    • B65D2401/35—Vertical or axial lines of weakness

Definitions

  • the invention relates to a closure cap for a container, which is provided with a guarantee band and is produced in one piece with the guarantee band from thermoplastic material by injection molding, the guarantee band being connected to the lower edge of the closure cap via a plurality of predetermined breaking connecting webs, and for this purpose is intended to at least partially surround the neck of the container and which, after the closure cap has been applied to the neck of the container, can be positively molded and brought into engagement with it by hot deformation.
  • Sealing caps for containers, in particular for bottles, produced in the injection molding process are known and customary in a wide variety of embodiments.
  • FR-A-2 395 909 by the applicant has already disclosed a closure cap of the type mentioned at the outset, in which the guarantee band can be deformed without mechanical aids.
  • the guarantee band has a constant, approximately wedge-shaped cross-section over its entire circumference.
  • the wedge tip of the guarantee band is designed as a predetermined breaking line. Irregularities in the guarantee band caused by the manufacturing process can possibly have an adverse effect on the shrinking process if no mechanical pressing tools are used.
  • the invention has for its object to avoid the disadvantages of the known, in particular to create a cap of the type mentioned, the guarantee tape is already plasticized when low heat output is applied, without tearing and that can be produced with forms that fill the Allow shape from the cap and over the predetermined breaking connecting webs in the guarantee tape.
  • the wall thickness of the guarantee band has a reinforcement in the area between two predetermined breaking connecting webs and that the individual reinforcements are interrupted by sections of smaller wall thickness, the lowest wall thickness in each case being in the area of a predetermined breaking connecting web.
  • this reinforcement i. H. So material thickening, various surprising effects are achieved.
  • it is ensured that during the injection molding process, when the liquefied thermoplastic is injected from the connecting webs into the guarantee band section, the two material flows which are moving towards each other come into contact with one another over a larger area and the guarantee band is thereby solidified in this area.
  • the invention thus creates both a guarantee band which can be plasticized faster and with less thermal energy in the area between the reinforcements, and a guarantee band which is more resistant to overheating in a wide range than known guarantee bands.
  • Sealing caps with a guarantee band have already become known, in which cross-sectional changes are provided on the guarantee band.
  • DE-A-2 338 069 shows a sealing cap with a guarantee band which has teeth on the inside. This toothing engages in an external toothing on the container mouth, so that when the screw cap is unscrewed, the guarantee band remains at the container mouth and the predetermined breaking webs tear.
  • This guarantee band therefore does not have to be formed on the neck of the container by hot forming, since it is fixed on the container mouth by the teeth.
  • the toothing also improves the manufacturing process by injection molding, since the individual teeth are not arranged in a specific relationship to the individual predetermined breaking connecting webs. As a result, problems can arise during the injection molding process if the liquefied thermoplastic meets at unfavorable points in the guarantee strip section.
  • the invention can be implemented particularly advantageously if the reinforcement is provided on the inside of the guarantee band and has an approximately tendon-like course. This allows particularly simple manufacture using the injection molding process.
  • Bottle closures which are placed in fast-running systems and hot-formed with large temperature tolerances, have shown that the best results can be achieved both functionally and optically if the reinforcement is around 10% to 15% of the wall thickness of the guarantee band.
  • a guarantee tape is used which has a wall thickness of approximately 0.35 to 0.45 mm and in which the reinforcement is approximately 0.03 to 0.07 mm.
  • a closure cap 1 is placed on a container neck 2 and is exposed to the flow of a hot air nozzle 3 arranged on the side.
  • the container neck 2 is rotated such that the entire circumference of the closure cap 1 is acted upon by the hot air nozzle 3 in the plane of the guarantee band 4.
  • the guarantee band 4 is plasticized and wraps around an annular bead 5 on the container neck 2.
  • the container neck 2 is closed in a theft-proof manner by the closure cap 1.
  • the guarantee band 4 lies in a form-fitting manner around the container neck 2 and the closure cap 1 can only be removed from the container neck 2 by tearing the predetermined breaking connecting webs 6.
  • Fig. 2 shows a torn guarantee tape 4, in which the connecting webs 6 are torn in the manner described when removing the container neck 2.
  • the multiplicity of connecting webs 6 allows, when the closure cap 1 is sprayed, a mold arrangement which, as shown by arrows in FIG. 3, is filled from the base of the cap.
  • the liquid thermoplastic material penetrates through the connecting webs 6 into the area of the guarantee band, the individual partial flows x and y, which arise behind the connecting webs 6, meet approximately in the middle between two connecting webs 6.
  • the plastic material In the area of the dividing line 7, in which two partial flows x and y meet, the plastic material requires a greater thickness in order to be mechanically firmly connected in the same way as in the remaining area of the guarantee tape 4, which has a homogeneous and laminar material structure.
  • a material reinforcement 8 is therefore provided in this area, as illustrated in FIGS. 4 to 6.
  • FIGS. 4 to 6 In the plan view (FIG. 4) it is clearly recognizable as a tendon-like interruption of the inner wall of the tamper-evident band 4, which is circular in itself. This thickening can be achieved particularly simply because the inner wall of the tamper-evident band 4 in the remaining area runs slightly conically outwards and the reinforcement means a simple transition of the inner wall to a cylindrical course.
  • the material reinforcement can also be achieved in a different way, but this type of training has been justified for manufacturing reasons and in view proven particularly easy to demold the cap 1 from an injection molding tool.
  • the wall thickness of the guarantee tape 4 is 0.4 mm at the widest point.
  • the reinforcement 8 is 0.05 mm at the thickest point, so that the total wall thickness in the area of the reinforcement 8 increases to 0.45 mm.
  • the guarantee strip 4 is softened particularly strongly in the sections between the connecting webs 6 and the material reinforcements 8, wherein a shrinking process of the entire guarantee strip 4 can be observed before shrinking occurs in the region of the reinforcement 8.
  • the shrinking i.e. H. So the reduction in diameter of the guarantee band is achieved by combined heat and pressure from hot air flowing out of the nozzle 3. Even a segment-like softening of the guarantee band 4 in the sections between the reinforcements 8 therefore ensures a secure and theft-proof seating of the closure cap 1 on the container neck 2.

Description

Die Erfindung betrifft eine Verschlusskappe für einen Behälter, die mit einem Garantieband versehen ist und einstückig mit dem Garantieband aus thermoplastischem Material im Spritzgussverfahren hergestellt ist, wobei das Garantieband über eine Mehrzahl von Sollbruch-Verbindungsstegen mit dem unteren Rand der Verschlusskappe verbunden ist, und das dazu bestimmt ist, den Behälterhals wenigstens teilweise zu umgeben und das weiterhin nach dem Aufbringen der Verschlusskappe auf den Behälterhals durch Warmverformung formschlüssig an diesem anformbar und in Eingriff bringbar ist.The invention relates to a closure cap for a container, which is provided with a guarantee band and is produced in one piece with the guarantee band from thermoplastic material by injection molding, the guarantee band being connected to the lower edge of the closure cap via a plurality of predetermined breaking connecting webs, and for this purpose is intended to at least partially surround the neck of the container and which, after the closure cap has been applied to the neck of the container, can be positively molded and brought into engagement with it by hot deformation.

Im Spritzgussverfahren hergestellte Verschlusskappen für Behälter, insbesondere für Flaschen, sind in den verschiedensten Ausführungsformen bekannt und gebräuchlich.Sealing caps for containers, in particular for bottles, produced in the injection molding process are known and customary in a wide variety of embodiments.

Bei diesen Verschlusskappen ergibt sich ein Problem daraus, dass es wünschbar ist, die Garantiebänder in einer Weise zu verformen, die möglichst geringe Wärmezufuhr erfordert. Diese Forderung ergibt sich sowohl unter wirtschaftlichen Aspekten, als auch insbesondere im Hinblick darauf, dass bei automatischen Verschliessanlagen die Taktzeiten immer grösser werden und deshalb die für das Warmverformen des Garantiebands zur Verfügung stehende Zeit immer kürzer wird. So sind derzeit bereits in der Getränkeindustrie Abfüllanlagen mit über 40.000 Flaschen pro Stunde im Einsatz.A problem with these sealing caps arises from the fact that it is desirable to deform the guarantee bands in a manner that requires the least possible heat input. This requirement arises both from an economic point of view and, in particular, with regard to the fact that the cycle times for automatic capping systems are becoming longer and therefore the time available for hot forming the guarantee strip is becoming shorter and shorter. Filling systems with over 40,000 bottles per hour are already in use in the beverage industry.

Wünschenswert ist es deshalb, die Garantiebänder ohne Einsatz eines mechanischen Werkzeugs allein durch Wärmezufuhr oder aber durch Wärmezufuhr und Druckluftzufuhr anzuformen, da sich dadurch die mechanischen Werkzeugen innewohnenden Verzögerungen vermeiden lassen.It is therefore desirable to form the guarantee bands without the use of a mechanical tool solely by supplying heat or else by supplying heat and compressed air, since this avoids the inherent delays in the mechanical tools.

Durch die FR-A-2 395 909 der Anmelderin ist bereits eine Verschlusskappe der eingangs genannten Art bekannt geworden, bei der das Garantieband ohne mechanische Hilfsmittel deformierbar ist. Das Garantieband hat über seinen gesamten Umfang einen gleichbleibenden, etwa keilförmigen Querschnitt. Die Keilspitze des Garantiebands ist dabei als Sollbruchlinie ausgebildet. Durch den Herstellungsprozess bedingte Unregelmässigkeiten im Garantieband können sich möglicherweise nachteilig auf den Schrumpfprozess auswirken, wenn keine mechanischen Anpresswerkzeuge verwendet werden.FR-A-2 395 909 by the applicant has already disclosed a closure cap of the type mentioned at the outset, in which the guarantee band can be deformed without mechanical aids. The guarantee band has a constant, approximately wedge-shaped cross-section over its entire circumference. The wedge tip of the guarantee band is designed as a predetermined breaking line. Irregularities in the guarantee band caused by the manufacturing process can possibly have an adverse effect on the shrinking process if no mechanical pressing tools are used.

In der britischen Patentschrift 1,384,370 (United Glass) ist eine Verschlusskappe gezeigt, welche durch Erzeugen eines Garantiebands mit elementarer Vorzugsrichtung einen automatischen « Schrumpfeffekt beim Anlegen von Wärme gewährleisten soll. Diese Verschlusskappe ist nur schwierig herstellbar, da ein ausserordentlich aufwendiges und nur niedere Produktionszeiten erreichendes Werkzeug verwendet werden muss. Vor allem das seitliche Einspritzen des Kunststoffs im Bereich des Garantiebands erfordert ein technisch hochkompliziertes Werkzeug, wobei das Konstruktionsprinzip bei Mehrfachformen zu besonderen Schwierigkeiten führen kann.In the British patent 1,384,370 (United Glass) a closure cap is shown which is to guarantee an automatic shrinking effect when applying heat by producing a guarantee tape with an elementary preferred direction. This sealing cap is difficult to manufacture, since an extremely complex tool that only achieves short production times has to be used. In particular, the lateral injection of the plastic in the area of the guarantee tape requires a technically highly complicated tool, although the design principle can lead to particular difficulties in the case of multiple molds.

Der Erfindung liegt die Aufgabe zugrunde, die Nachteile des Bekannten zu vermeiden, insbesondere also eine Verschlusskappe der eingangs genannten Art zu schaffen, dessen Garantieband bereits beim Anlegen geringer Wärmeleistungen plastifiziert wird, ohne dabei zu reissen und das mit Formen herstellbar ist, die ein Füllen der Form von der Verschlusskappe her und über die Sollbruch-Verbindungsstege in das Garantieband ermöglichen.The invention has for its object to avoid the disadvantages of the known, in particular to create a cap of the type mentioned, the guarantee tape is already plasticized when low heat output is applied, without tearing and that can be produced with forms that fill the Allow shape from the cap and over the predetermined breaking connecting webs in the guarantee tape.

Erfindungsgemäss wird dies dadurch erreicht, dass die Wandstärke des Garantiebands im Bereich zwischen je zwei Sollbruch-Verbindungsstegen je eine Verstärkung aufweist und dass die einzelnen Verstärkungen durch Abschnitte geringerer Wandstärke unterbrochen sind, wobei die geringste Wandstärke jeweils im Bereich eines Sollbruch-Verbindungsstegs liegt. Durch diese Verstärkung, d. h. also Materialverdickung, werden verschiedene überraschende Effekte erzielt. Einmal wird gewährleistet, dass beim Spritzvorgang, wenn das verflüssigte Thermoplast von den Verbindungsstegen her in den Garantiebandabschnitt gespritzt wird, die beiden sich aufeinander zu bewegenden Materialströme über eine grössere Fläche miteinander in Kontakt kommen und dadurch das Garantieband in diesem Bereich verfestigt wird. Ausserdem ergibt sich bei der späteren Wärmezufuhr und beim Anschrumpfen vorteilhaft, dass das Garantieband durch die zunehmende und abnehmende Materialstärke zwischen zwei Sollbruch-Verbindungsstegen ausreichende Stabilität behält, auch wenn die Plastifizierungstemperatur z. B. überschritten wird.This is achieved according to the invention in that the wall thickness of the guarantee band has a reinforcement in the area between two predetermined breaking connecting webs and that the individual reinforcements are interrupted by sections of smaller wall thickness, the lowest wall thickness in each case being in the area of a predetermined breaking connecting web. Through this reinforcement, i. H. So material thickening, various surprising effects are achieved. On the one hand, it is ensured that during the injection molding process, when the liquefied thermoplastic is injected from the connecting webs into the guarantee band section, the two material flows which are moving towards each other come into contact with one another over a larger area and the guarantee band is thereby solidified in this area. In addition, it is advantageous in the subsequent supply of heat and when shrinking that the guarantee tape retains sufficient stability due to the increasing and decreasing material thickness between two predetermined breaking connecting webs, even if the plasticizing temperature is e.g. B. is exceeded.

Im Extremfall kann dies bedeuten, dass das Garantieband nur in den Bereichen zwischen der Verstärkung und dem darauffolgenden Sollbruch-Verbindungssteg schrumpft, im Verstärkungsbereich jedoch noch starr bleibt. Dieses partielle Schrumpfen in einer Vielzahl von Teilbereichen um den Garantiebandumfang herum reicht jedoch vollkommen aus, um das Garantieband formschlüssig am Behälter anzuformen. Gleichzeitig wird dabei gewährleistet, dass wenn z. B. durch ein Versehen zu viel Wärmeenergie zugeführt wird, eine Zerstörung des Garantiebands immer noch vermieden wird. Sofern nämlich in einem solchen Fall auch die Abschnitte zwischen den Verstärkungen und den Sollbruch-Verbindungsstegen überhitzt und zu « plastisch werden, sodass normalerweise eine Beschädigung des Garantiebands eintreten würde, bleibt das Garantieband im Bereich der Verstärkungen aufgrund der grösseren Masse fester. Dadurch tritt kein « Herabtropfen oder « Herunterhängen » grösserer Abschnitte des Garantiebands auf, sondern es können lediglich kurze Abschnitte zwischen den Verstärkungen etwas stärker durchhängen, was jedoch weder die Funktion, noch das Aussehen des Garantiebands beeinträchtigt.In extreme cases, this can mean that the guarantee band only shrinks in the areas between the reinforcement and the subsequent predetermined breaking connecting web, but still remains rigid in the reinforcement area. However, this partial shrinkage in a large number of subareas around the scope of the guarantee band is completely sufficient to form-fit the guarantee band on the container. At the same time it is ensured that if z. B. too much thermal energy is supplied by mistake, destruction of the guarantee band is still avoided. If, in such a case, the sections between the reinforcements and the predetermined breaking connecting webs overheat and become too plastic, so that damage to the guarantee band would normally occur, the guarantee band remains firmer in the area of the reinforcements due to the greater mass. As a result, there is no "dripping or" hanging down "of larger sections of the guarantee tape, but only short sections between the reinforcements can sag a little more, but neither the function, nor the appearance of the guarantee tape.

Die Erfindung schafft also sowohl ein Garantieband, welches schneller und mit geringerer Wärmeenergie im Bereich zwischen den Verstärkungen plastifizierbar ist, als auch ein Garantieband, welches bei Uebererhitzung in einem weiten Bereich widerstandsfähiger ist, als bekannte Garantiebänder.The invention thus creates both a guarantee band which can be plasticized faster and with less thermal energy in the area between the reinforcements, and a guarantee band which is more resistant to overheating in a wide range than known guarantee bands.

Es sind zwar bereits Verschlusskappen mit Garantieband bekannt geworden, bei denen am Garantieband Querschnittsveränderungen vorgesehen sind. So zeigt beispielsweise die DE-A-2 338 069 eine Verschlusskappe mit einem Garantieband, das auf der Innenseite eine Verzahnung aufweist. Diese Verzahnung greift in eine Aussenverzahnung an der Behältermündung, so dass beim Aufdrehen der Schraubkappe das Garantieband an der Behältermündung verbleibt und die Sollbruchstege reissen. Dieses Garantieband muss demnach nicht durch Warmverformung an den Behälterhals angeformt werden, da es durch die Verzahnung drehfest auf der Behältermündung sitzt. Mit der Verzahnung wird aber auch eine Verbesserung des Herstellungsprozesses durch Spritzgiessen erreicht, da die einzelnen Zähne nicht in einem bestimmten Verhältnis zu den einzelnen Sollbruch-Verbindungsstegen angeordnet sind. Dadurch können beim Spritzvorgang Probleme auftreten, wenn das verflüssigte Thermoplast im Garantiebandabschnitt an ungünstigen Stellen zusammentrifft.Sealing caps with a guarantee band have already become known, in which cross-sectional changes are provided on the guarantee band. For example, DE-A-2 338 069 shows a sealing cap with a guarantee band which has teeth on the inside. This toothing engages in an external toothing on the container mouth, so that when the screw cap is unscrewed, the guarantee band remains at the container mouth and the predetermined breaking webs tear. This guarantee band therefore does not have to be formed on the neck of the container by hot forming, since it is fixed on the container mouth by the teeth. The toothing also improves the manufacturing process by injection molding, since the individual teeth are not arranged in a specific relationship to the individual predetermined breaking connecting webs. As a result, problems can arise during the injection molding process if the liquefied thermoplastic meets at unfavorable points in the guarantee strip section.

Besonders vorteilhaft lässt sich die Erfindung realisieren, wenn die Verstärkung auf der Innenseite des Garantiebands vorgesehen ist und einen etwa sehnenartigen Verlauf aufweist. Dies lässt besonders einfache Herstellung im Spritzgussverfahren zu.The invention can be implemented particularly advantageously if the reinforcement is provided on the inside of the guarantee band and has an approximately tendon-like course. This allows particularly simple manufacture using the injection molding process.

Besonders gute Resultate haben sich in der Praxis ergeben, wenn die Verstärkung etwa 8 % bis 25% der Wandstärke des Garantiebands beträgt.Particularly good results have been obtained in practice if the reinforcement is approximately 8% to 25% of the wall thickness of the guarantee tape.

Bei Flaschenverschlüssen, die in schnell laufenden Anlagen aufgesetzt und mit grossen Temperaturtoleranzen warm verformt werden, hat es sich gezeigt, dass sowohl funktionsmässig, als auch optisch beste Resultate erzielt werden können, wenn die Verstärkung etwa 10 % bis 15 % der Wandstärke des Garantiebands beträgt. Vorzugsweise wird dabei ein Garantieband verwendet, welches etwa 0,35 bis 0,45 mm Wandstärke aufweist und bei dem die Verstärkung etwa 0,03 bis 0,07 mm beträgt.Bottle closures, which are placed in fast-running systems and hot-formed with large temperature tolerances, have shown that the best results can be achieved both functionally and optically if the reinforcement is around 10% to 15% of the wall thickness of the guarantee band. Preferably, a guarantee tape is used which has a wall thickness of approximately 0.35 to 0.45 mm and in which the reinforcement is approximately 0.03 to 0.07 mm.

Ersichtlicherweise werden der technische Fortschritt und der erfinderische Inhalt des Anmeldungsgegenstands sowohl durch die neuen Einzelmerkmale, als auch durch Kombination und Unterkombination der Verwendung findenden Merkmale gewährleistet. Die Erfindung ist im folgenden in einem Ausführungsbeispiel anhand der Zeichnungen näher erläutert. Es zeigen :

  • Figur 1 Die schematische Darstellung einer Schraubkappe mit den Merkmalen der Erfindung im Teilschnitt,
  • Figur 2 die Schraubkappe gemäss Fig. 1 mit verformtem und abgerissenem Garantieband,
  • Figur 3 die schematische Darstellung des Materialflusses beim Spritzgiessen der Schraubkappe gemäss Fig. 1.
  • Figur 4 einen Schnitt durch das Garantiebahd der Schraubkappe gemäss Fig. 1 in vergrössertem Maßstab, und
  • Figuren 5 und 6 je eine Schnittdarstellung des Garantiebands gemäss Fig. 4.
Obviously, the technical progress and the inventive content of the subject of the application are guaranteed both by the new individual features and by a combination and sub-combination of the features used. The invention is explained in more detail below in an exemplary embodiment with reference to the drawings. Show it :
  • FIG. 1 shows a schematic representation of a screw cap with the features of the invention in partial section,
  • FIG. 2 shows the screw cap according to FIG. 1 with a deformed and torn guarantee band,
  • FIG. 3 shows the schematic representation of the material flow during injection molding of the screw cap according to FIG. 1.
  • FIG. 4 shows a section through the guarantee zone of the screw cap according to FIG. 1 on an enlarged scale, and
  • FIGS. 5 and 6 each show a sectional view of the guarantee tape according to FIG. 4.

Gemäss Fig. 1 ist eine Verschlusskappe 1 auf einen Behälterhals 2 aufgesetzt und wird der Strömung einer seitlich angeordneten Heissluftdüse 3 ausgesetzt. Während des Erwärmungsvorgangs wird der Behälterhals 2 derart rotiert, dass der gesamte Umfang der Verschlusskappe 1 in der Ebene des Garantiebands 4 von der Heissluftdüse 3 beaufschlagt wird. Dadurch wird das Garantieband 4 plastifiziert und legt sich um einen Ringwulst 5 am Behälterhals 2. Nach dem Erkalten und Erstarren des Garantiebands 4 ist der Behälterhals 2 durch die Verschlusskappe 1 diebstahlsicher verschlossen. Das Garantieband 4 liegt formschlüssig um den Behälterhals 2 und die Verschlusskappe 1 kann nur unter Zerreissen der Sollbruch-Verbindungsstege 6 vom Behälterhals 2 entfernt werden.1, a closure cap 1 is placed on a container neck 2 and is exposed to the flow of a hot air nozzle 3 arranged on the side. During the heating process, the container neck 2 is rotated such that the entire circumference of the closure cap 1 is acted upon by the hot air nozzle 3 in the plane of the guarantee band 4. As a result, the guarantee band 4 is plasticized and wraps around an annular bead 5 on the container neck 2. After the guarantee band 4 has cooled and solidified, the container neck 2 is closed in a theft-proof manner by the closure cap 1. The guarantee band 4 lies in a form-fitting manner around the container neck 2 and the closure cap 1 can only be removed from the container neck 2 by tearing the predetermined breaking connecting webs 6.

Fig. 2 zeigt ein aufgerissenes Garantieband 4, bei welchem die Verbindunsstege 6 in der beschriebenen Weise beim Entfernen vom Behälterhals 2 gerissen sind. Die Vielzahl von Verbindsstegen 6 erlaubt beim Spritzen der Verschlusskappe 1 eine Formanordnung, welche wie in Fig. 3 durch Pfeile dargestellt ist, vom Kappenboden her gefüllt wird. Das flüssige thermoplastische Material dringt dabei durch die Verbindungsstege 6 in den Bereich des Garantiebands ein, wobei sich jeweils etwa in der Mitte zwischen zwei Verbindungsstegen 6 die einzelnen Teilströme x und y treffen, welche sich jeweils hinter den Verbindungsstegen 6 ergeben. Im Bereich der Trennlinie 7, bei der sich jeweils zwei Teilströme x und y treffen, bedarf das Kunststoffmaterial einer grösseren Dicke, um sich in gleicher Weise mechanisch fest zu verbinden, als im restlichen Bereich des Garantiebands 4, in dem homogener und laminarer Materialaufbau vorliegt.Fig. 2 shows a torn guarantee tape 4, in which the connecting webs 6 are torn in the manner described when removing the container neck 2. The multiplicity of connecting webs 6 allows, when the closure cap 1 is sprayed, a mold arrangement which, as shown by arrows in FIG. 3, is filled from the base of the cap. The liquid thermoplastic material penetrates through the connecting webs 6 into the area of the guarantee band, the individual partial flows x and y, which arise behind the connecting webs 6, meet approximately in the middle between two connecting webs 6. In the area of the dividing line 7, in which two partial flows x and y meet, the plastic material requires a greater thickness in order to be mechanically firmly connected in the same way as in the remaining area of the guarantee tape 4, which has a homogeneous and laminar material structure.

In diesem Bereich ist deshalb, wie in Fig. 4 bis 6 verdeutlicht, eine Materialverstärkung 8 vorgesehen. In der Draufsicht (Fig. 4) ist sie deutlich erkennbar, als sehnenartige Unterbrechung der an sich kreisförmig verlaufenden Innenwand des Garantiebands 4. Diese Verdickung lässt sich besonders deshalb einfach erreichen, weil die Innenwand des Garantiebands 4 im übrigen Bereich leicht konisch nach aussen verläuft und die Verstärkung einen einfachen Uebergang der Innenwand zu einem zylindrischen Verlauf bedeutet.A material reinforcement 8 is therefore provided in this area, as illustrated in FIGS. 4 to 6. In the plan view (FIG. 4) it is clearly recognizable as a tendon-like interruption of the inner wall of the tamper-evident band 4, which is circular in itself. This thickening can be achieved particularly simply because the inner wall of the tamper-evident band 4 in the remaining area runs slightly conically outwards and the reinforcement means a simple transition of the inner wall to a cylindrical course.

Selbstverständlich lässt sich die Materialverstärkung auch anders erreichen, doch hat sich gerade eine derartige Ausbildung aus herstellungstechnischen Gründen und im Hinblick auf einfache Entformbarkeit der Verschlusskappe 1 aus einem Spritzgusswerkzeug besonders bewährt.Of course, the material reinforcement can also be achieved in a different way, but this type of training has been justified for manufacturing reasons and in view proven particularly easy to demold the cap 1 from an injection molding tool.

Gemäss Fig. 6 beträgt die Wandstärke des Garantiebands 4 an der breitesten Stelle 0,4 mm. Die Verstärkung 8 beträgt 0,05 mm an der dicksten Stelle, sodass sich die gesamte Wandstärke im Bereich der Verstärkung 8 auf 0,45 mm erhöht. Bei der Erwärmung durch eine Heissluftdüse 3 wird dadurch das Garantieband 4 besonders stark in den Abschnitten zwischen den Verbindungsstegen 6 und den Materialverstärkungen 8 erweicht, wobei sich ein Schrumpfvorgang des gesamten Garantiebands 4 beobachten lässt, bevor ein Schrumpfen im Bereich der Verstärkung 8 eintritt. Das Schrumpfen, d. h. also die Durchmesserverringerung des Garantiebands wird dabei durch kombinierte Wärmeeinwirkung und Druckeinwirkung durch ausströmende Heissluft aus der Düse 3 erreicht. Auch eine nur segmentartige Erweichung des Garantiebands 4 in den Abschnitten zwischen den Verstärkungen 8 wird deshalb ein sicheres und diebstahlsicheres Sitzen der Verschlusskappe 1 auf den Behälterhals 2 gewährleistet.6, the wall thickness of the guarantee tape 4 is 0.4 mm at the widest point. The reinforcement 8 is 0.05 mm at the thickest point, so that the total wall thickness in the area of the reinforcement 8 increases to 0.45 mm. When heated by a hot air nozzle 3, the guarantee strip 4 is softened particularly strongly in the sections between the connecting webs 6 and the material reinforcements 8, wherein a shrinking process of the entire guarantee strip 4 can be observed before shrinking occurs in the region of the reinforcement 8. The shrinking, i.e. H. So the reduction in diameter of the guarantee band is achieved by combined heat and pressure from hot air flowing out of the nozzle 3. Even a segment-like softening of the guarantee band 4 in the sections between the reinforcements 8 therefore ensures a secure and theft-proof seating of the closure cap 1 on the container neck 2.

Claims (5)

1. A closure cap (1) for a container, which is provided with a guarantee strip and which is produced integrally with the guarantee strip (4) from thermoplastic material by an injection moulding process, wherein the guarantee strip (4) is joined to the lower edge of the closure cap by way of a multiplicity of desired-rupture connecting portions (6) and is intended at least partially to surround the neck of the container and, after the closure cap (1) has been fitted onto the neck of the container, can be form-lockingly shaped to and brought into engagement with the neck of the container by hot shaping, characterised in that the wall thickness of the guarantee strip (4) has a respective reinforcement (8) in the region between each two desired-rupture connecting portions (6) and that the individual reinforcements (8) are interrupted by portions of smaller wall thickness, wherein the smallest wall thickness in each case is in the region of a desired-rupture connecting portion.
2. A closure cap according to claim 1, characterised in that the reinforcement (8) is of a substantially chord-like configuration.
3. A closure cap according to claim 1 or claim 2, characterised in that the reinforcement is from 8 % to 25 % of the wall thickness of the guarantee strip (4).
4. A closure cap according to claim 3, characterised in that the reinforcement is from 10 % to 15 % of the wall thickness of the guarantee strip (4).
5. A closure cap according to claim 1, characterised in that the wall thickness of the guarantee strip (4) is from about 0.35 to 0.45 mm and the increase in thickness is from about 0.03 to 0.07 mm.
EP81810029A 1980-02-14 1981-02-03 Closure cap for a container Expired EP0034997B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81810029T ATE7589T1 (en) 1980-02-14 1981-02-03 CAP FOR A CONTAINER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1203/80 1980-02-14
CH120380 1980-02-14

Publications (2)

Publication Number Publication Date
EP0034997A1 EP0034997A1 (en) 1981-09-02
EP0034997B1 true EP0034997B1 (en) 1984-05-23

Family

ID=4204914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81810029A Expired EP0034997B1 (en) 1980-02-14 1981-02-03 Closure cap for a container

Country Status (14)

Country Link
US (1) US4345692A (en)
EP (1) EP0034997B1 (en)
JP (1) JPS56131160A (en)
AR (1) AR222119A1 (en)
AT (1) ATE7589T1 (en)
AU (1) AU536146B2 (en)
BR (1) BR8100891A (en)
CA (1) CA1154400A (en)
DE (1) DE3163698D1 (en)
ES (1) ES267102Y (en)
GR (1) GR72763B (en)
IE (1) IE810281L (en)
NZ (1) NZ196262A (en)
ZA (1) ZA81959B (en)

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US4545496A (en) * 1981-07-24 1985-10-08 H-C Industries, Inc. Plastic closure with mechanical pilfer band
CH653307A5 (en) * 1981-12-11 1985-12-31 Walter Wiedmer SCREW CAP WITH GUARANTEE STRIP FOR CONTAINERS.
JPS58502165A (en) * 1981-12-23 1983-12-15 アンステイテユ・パストウ−ル Method of detecting the presence of a nucleic acid sequence using a modified nucleic acid probe that can be recognized by a specific antibody
DE3371324D1 (en) * 1982-02-20 1987-06-11 Alcoa Deutschland Gmbh Construction and mounting process for a cap and cap for a container neck provided with a screw-thread or a bead
EP0099332A3 (en) * 1982-07-14 1985-05-29 Albert Obrist AG Closure cap for containers
US4474304A (en) * 1983-02-24 1984-10-02 Jacobs Stanley A Plastic container lid with tear-away tamper resistant sealing strip
GB8319444D0 (en) * 1983-07-19 1983-08-17 Nat Plastics Ltd Container closure
FR2550514B1 (en) * 1983-08-12 1986-07-04 Lammerant Henri INVIOLABLE CAPSULE
DE3345775A1 (en) * 1983-12-17 1985-06-20 Owens-Illinois, Inc., Toledo, Ohio Anti-theft package
NL8400428A (en) * 1984-02-09 1985-09-02 Kornelis Kunsthars Prod Ind Bv METHOD FOR MANUFACTURING A SEALING CAP WITH A SEALING GASKET FROM A POLYPROPENE MATERIAL FOR A CONTAINER; Sealing cap provided with an olefin polymer, as well as a method for closing and sealing a container with a sealing cap made from polypropylene material.
US4709824A (en) * 1985-12-12 1987-12-01 Tri-Tech Systems International Inc. Tamper evident plastic caps with lower separable or breakaway portions and a method of forming them
US4708255A (en) * 1985-12-12 1987-11-24 Tri-Tech Systems International Inc. Closure cap with a linerless seal and a method for forming such closure and seal
US4872304A (en) * 1985-12-12 1989-10-10 Tri-Tech Systems International Inc. Closure cap with a seal and method of and apparatus for forming such closure and seal
US4823967A (en) * 1987-06-10 1989-04-25 Tri-Tech Systems International Inc. Closure for container and method for forming the closure
US4925617A (en) * 1987-06-10 1990-05-15 Tri-Tech Systems International, Inc. Method of forming a closure cap with a seal
US4886947A (en) * 1987-06-17 1989-12-12 Tri-Tech Systems International, Inc. Closure system and method of forming and using same
US4856667A (en) * 1987-06-17 1989-08-15 Tri-Tech Systems International Inc. Container and cap
US4811857A (en) * 1987-06-17 1989-03-14 Tri-Tech Systems International Inc. Closure system and method of forming and using same
US5100009A (en) * 1989-05-03 1992-03-31 Tri-Tech Systems International Inc. Closure and access systems for containers and methods of manufacture and use
US4890754A (en) * 1989-05-26 1990-01-02 Zapata, Industries, Inc. Pilfer-resistant plastic closure
US4993571A (en) * 1989-09-14 1991-02-19 American Safety Closure Corp. Tamper-evident cap
AU656314B2 (en) * 1989-12-28 1995-02-02 Innovative Closures, Inc. Tamper evident caps and methods for producing such caps
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US5542095A (en) * 1993-08-24 1996-07-30 Pacific Communication Sciences Frequency Reference Compensation
US5813553A (en) * 1995-06-07 1998-09-29 Kerr Group, Inc. Snap-band tamper evident
US6062408A (en) * 1997-04-09 2000-05-16 Dtl Technology Limited Partnership Wide mouth hot fill container
US6237791B1 (en) 1997-04-09 2001-05-29 Dtl Technology Limited Partnership Wide mouth hot fill container
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US6631820B2 (en) * 2000-12-22 2003-10-14 Seaquist Closures Foreign, Inc. Tamper-evident dispensing closure with partial breakaway cover
US6405885B1 (en) 2000-12-22 2002-06-18 Seaquist Closures Foreign, Inc. Locking tamper-evident dispensing closure
JP6128831B2 (en) * 2012-12-21 2017-05-17 日本クロージャー株式会社 Plastic container lid

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Also Published As

Publication number Publication date
IE810281L (en) 1981-08-14
AR222119A1 (en) 1981-04-15
ATE7589T1 (en) 1984-06-15
ES267102U (en) 1983-03-16
ZA81959B (en) 1982-04-28
CA1154400A (en) 1983-09-27
GR72763B (en) 1983-12-02
EP0034997A1 (en) 1981-09-02
ES267102Y (en) 1986-08-01
AU6717081A (en) 1981-08-20
BR8100891A (en) 1981-08-25
NZ196262A (en) 1983-04-12
JPS56131160A (en) 1981-10-14
AU536146B2 (en) 1984-04-19
US4345692A (en) 1982-08-24
DE3163698D1 (en) 1984-06-28

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