EP0178253A1 - Plastic screw closure - Google Patents

Plastic screw closure Download PDF

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Publication number
EP0178253A1
EP0178253A1 EP85810401A EP85810401A EP0178253A1 EP 0178253 A1 EP0178253 A1 EP 0178253A1 EP 85810401 A EP85810401 A EP 85810401A EP 85810401 A EP85810401 A EP 85810401A EP 0178253 A1 EP0178253 A1 EP 0178253A1
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EP
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Prior art keywords
closure
screw cap
radius
bottle neck
cap according
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Granted
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EP85810401A
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German (de)
French (fr)
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EP0178253B1 (en
Inventor
Alberto Menichetti
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Gebr HOFFMANN AG
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Gebr HOFFMANN AG
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Application filed by Gebr HOFFMANN AG filed Critical Gebr HOFFMANN AG
Priority to AT85810401T priority Critical patent/ATE58695T1/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
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0407—Threaded or like caps or cap-like covers secured by rotation with integral sealing means
    • B65D41/0428—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a collar, flange, rib or the like contacting the top rim or the top edges or the external surface of a container neck
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S215/00—Bottles and jars
    • Y10S215/01—Fins

Definitions

  • the 'invention relates to a screw cap according to the preamble of claim 1.
  • Screw caps with seals resting on the end face of the bottle neck are known.
  • a sealing washer made of soft, rubber-like material is inserted at the bottom of the closure and glued or injected.
  • closures which consist of a single part and whose inner part, preferably between the end of the thread and its flat bottom, has one or more circumferential ribs with different cross sections. Most of the time, such ribs (lips) perform the sealing function in connection with the neck of the container sealed with it.
  • GB-PS 960 443 shows such an embodiment of such closures. With this closure, however, a very clearly pronounced horizontal rib is also arranged between the threaded end and the bottom of the closure. A method for the difficult demolding of the rib is not specified.
  • closures have a flat bottom and are suitable for still contents or for slightly overpressured contents, e.g. Beer, thought. These closures are sufficient for filling goods that are not subjected to pasteurization and / or sterilization in the bottle.
  • GB-PS 925 647 shows an example of another closure and its production method.
  • a disadvantage of this closure is the difficulty in demolding the sealing lip, which requires a special design of the injection mold, and a very precise adjustment of the production conditions, which of course places a substantial burden on the production costs.
  • An arched base is also known from the abovementioned document.
  • the transition between the floor and the jacket runs at an obtuse angle with a sharp edge.
  • the upper edge of a thin flexible lip lies on the inside opposite the outer edge.
  • the invention has for its object to provide a closure that withstands both the increased internal pressure during pasteurization and / or sterilization and the increased temperature without significant change in shape.
  • Another object of the invention is to design the closure in such a way that it can be produced in a single operation.
  • there must be a simple shape from the injection mold.
  • the ribs act on the closure bottom because they prevent excessive deflection.
  • the curved design of the closure base is a further advantageous measure to prevent the closure from stretching during heating and to reduce the stresses in the closure.
  • the screw cap 1 according to the cross section in FIG. 1 has a closure base 3 and a closure jacket 5 with a thread 7.
  • a circumferential rib in the form of an elastically flexible lip 9 is attached concentrically to the bottom.
  • the average diameter dl of the lip 9 decreases in the direction of its sealing edge 11.
  • the lip 9 has a trapezoidal cross section
  • the rib 13 has a profile adapted to the bottle mouth and enclosing its outer contour, in the example according to FIG. 2 a concave recess 37 which corresponds to the radius at the bottle neck 19.
  • the diameter d2 at the sealing edge 17 of the rib 13 is smaller than the outer diameter d3 of the bottle neck 19 at its upper end 31 (FIG. 2).
  • ribs 21 are attached, which extend radially outwards from the center 30 of the base 3 and can also include the casing 5.
  • the base 3 is curved in an arc shape, the radius R1 being equal to or greater than half the diameter d3 of the bottle neck 19.
  • the closure 1 has a curvature with radius R2.
  • the radii R2 and R1 can be in a ratio of 1: 2 to 1:10, preferably in a ratio of 1: 4.
  • the closure 1 is screwed onto the threaded neck 25 of a bottle 29.
  • the closure 1 is shown on the left half of FIG. 2 when there is no or only a very small one in the bottle 29 There is overpressure in relation to the surroundings; the right half shows the closure 1 as it is expanded by the excess pressure and the temperature increase, for example during sterilization.
  • the lip 9 rests on the annular end face 33 of the threadless section 35 on the bottle neck 19.
  • the sealing edge 11 is pressed against the center by the clamping force generated when screwing on due to the inclined design of the lip 9.
  • the closure works like the lid of a pressure vessel.
  • the material tension in the bottom is based on the formula Are defined. (p is the internal pressure, D is the diameter of the cover and SA is its wall thickness.)
  • the voltage increases with the quadratic power of the diameter.
  • a flat-bottom closure must have a wall thickness of 5.3 mm in order to withstand the same internal container pressure as a spherical closure with a wall thickness of 1 mm if the bottle neck has a diameter of 28 mm according to the MC-A standard.
  • the effect of the pressure on the material tensions in the transition between the base and the cylindrical outer shell also varies greatly, whether the base is flat and has an angle of 90 ° to the shell, or whether it is cambered and has a smooth transition with a large radius.
  • the bottom 3 of the closure 1 rises and the casing 5 widens only by a few tenths of a millimeter.
  • the two lips 9 and 13 remain in contact with the bottle neck 19, and on the other hand the lip 9 is pressed outwards by the increasing internal pressure. This force acting transversely to the lip 9 presses its sealing edge more and more with increasing pressure onto the corresponding contact point, i.e. the end face 33.
  • the lip 9 is designed as a tapering triangle, its fine sealing edge lies on the support point practically without transition.
  • two or more lips 9 can also be attached next to one another and act both as a direct seal and as a labyrinth seal.
  • a ring 37 can be molded onto the lower edge of the casing 5, which ring is separated from the closure 1 when the bottle 29 is opened for the first time and remains on the bottle neck 19 or - if this is desired - in one or more parts jumps off.
  • the closure 1 can be injection molded in a conventional manner with very simple tools and plastic materials that have already been tried and tested for bottle closures.

Abstract

Ein Schraubverschluss 1 aus Kunststoff für Flaschen 29 mit dauernd oder zeitweilig unter Überdruck stehendem Inhalt mit mindestens einer Dichtungslippe 9, die an der Stirnfläche 33 des Flaschenhalses 19 aufliegt und mit steigendem Innendruck stärker angepresst wird. Der Boden 3 des Verschlusses 1 ist gewölbt und mit Rippen 21 versehen, damit bei hohem Innendruck die Dehnung gering gehalten werden kann.A screw cap 1 made of plastic for bottles 29 with contents that are permanently or temporarily under positive pressure with at least one sealing lip 9, which rests on the end face 33 of the bottle neck 19 and is pressed more strongly with increasing internal pressure. The bottom 3 of the closure 1 is curved and provided with ribs 21 so that the expansion can be kept low at high internal pressure.

Description

Die 'Erfindung betrifft einen Schraubverschluss gemäss dem Oberbegriff des Patentanspruches l.The 'invention relates to a screw cap according to the preamble of claim 1.

Schraubverschlüsse mit an der Stirnfläche des Flaschenhalses aufliegenden Dichtungen sind bekannt.Screw caps with seals resting on the end face of the bottle neck are known.

Bei den gebräuchlichsten Verschlüssen aus Kunststoff ist am Boden des Verschlusses eine Dichtungsscheibe aus weichem, gummiartigem Material eingelegt und verklebt oder eingespritzt.In the most common plastic closures, a sealing washer made of soft, rubber-like material is inserted at the bottom of the closure and glued or injected.

Diese Dichtungen haben den Nachteil, dass zur Herstellung des Verschlusses mindestens zwei Arbeitsgänge notwendig und die Dichtungen folglich teuer sind, die Verschlüsse nicht sterilisationsbeständig sind und deren Material nicht durch Recycling wiederverwendbar gemacht werden kann.These seals have the disadvantage that at least two work steps are necessary to produce the closure and the seals are consequently expensive, the closures are not resistant to sterilization and the material cannot be made reusable by recycling.

Es sind auch andere Verschlüsse bekannt, die aus einem einzigen Teil bestehen, und deren innere Partie, vorzugsweise zwischen dem Ende des Gewindes und ihrem flachen Boden, eine oder mehrere umlaufende Rippen mit unterschiedlichen Querschnitten aufweist. Meistens erfüllen solche Rippen (Lippen) die Abdichtungsfunktion im Zusammenhang mit dem Hals des damit verschlossenen Gebindes.Other closures are also known which consist of a single part and whose inner part, preferably between the end of the thread and its flat bottom, has one or more circumferential ribs with different cross sections. Most of the time, such ribs (lips) perform the sealing function in connection with the neck of the container sealed with it.

Die GB-PS 960 443 zeigt eine solche Ausführung solcher Verschlüsse. Bei diesem Verschluss ist aber auch eine sehr deutlich ausgeprägte waagrechte Rippe zwischen Gewindeende und Verschlussboden angeordnet. Eine Methode für die schwierige Entformung der Rippe wird nicht angegeben.GB-PS 960 443 shows such an embodiment of such closures. With this closure, however, a very clearly pronounced horizontal rib is also arranged between the threaded end and the bottom of the closure. A method for the difficult demolding of the rib is not specified.

Diese Verschlüsse haben einen flachen Boden und sind für stille Füllgüter oder für leicht im Ueberdruck stehende Füllgüter, wie z.B. Bier, gedacht. Für Füllgüter, die in der Flasche keiner Pasteurisation und/oder Sterilisation unterworfen werden, genügen diese Verschlüsse.These closures have a flat bottom and are suitable for still contents or for slightly overpressured contents, e.g. Beer, thought. These closures are sufficient for filling goods that are not subjected to pasteurization and / or sterilization in the bottle.

Die GB-PS 925 647 zeigt ein Beispiel eines weiteren Verschlusses und dessen Produktionsmethode. Ein Nachteil dieses Verschlusses ist die Schwierigkeit der Entformung der Dichtungslippe, die eine Sonderkonstruktion des Spritzwerkzeuges verlangt sowie eine ganz genaue Einstellung der Produktionsbedingungen, was natürlich die Herstellungskosten im wesentlichen Masse belastet.GB-PS 925 647 shows an example of another closure and its production method. A disadvantage of this closure is the difficulty in demolding the sealing lip, which requires a special design of the injection mold, and a very precise adjustment of the production conditions, which of course places a substantial burden on the production costs.

Ebenfalls aus der obgenannten Schrift ist ein gewölbt ausgebildeter Boden bekannt. Der Uebergang zwischen Boden und Mantel verläuft aussen in einem stumpfen Winkel mit scharf ausgebildeter Kante. Der aussenliegenden Kante gegenüber liegt innen der obere Ansatz einer dünnen flexiblen Lippe.An arched base is also known from the abovementioned document. The transition between the floor and the jacket runs at an obtuse angle with a sharp edge. The upper edge of a thin flexible lip lies on the inside opposite the outer edge.

Bei erhöhtem Innendruck, beispielsweise beim Pasteurisieren oder Sterilisieren, entstehen im Uebergangsbereich zwischen dem Mantel und dem Boden Spannungen, deren Wert ein Mehrfaches ist von demjenigen im Boden oder im Mantel. Zudem sind die Spannungen an der Peripherie des gewölbten Bereichs und im Mantel völlig verschieden gross. Die Spannungen führen zu Dehnungen, welche durch die erhöhte Temperatur beim Pasteurisieren und insbesondere auch die lange Verweildauer im Autoklavenvon bis zu einer Stunde Werte erreichen, die eine zuverlässige Abdichtung der Flasche infolge der Vergrösserung des Verschlusses nicht mehr gewährleisten.With increased internal pressure, for example when pasteurizing or sterilizing, tensions arise in the transition area between the jacket and the bottom, the value of which is a multiple of that in the bottom or in the jacket. In addition, the stresses on the periphery of the curved area and in the jacket are completely different. The stresses lead to strains which, due to the increased temperature during pasteurization and in particular the long residence time in the autoclave of up to one hour, reach values which no longer guarantee reliable sealing of the bottle due to the enlargement of the closure.

Zusätzlich besteht die Gefahr, dass durch die grossen Spannungen und Spannungsdifferenzen an der Kante der Verschluss bricht.There is also a risk that the closure will break due to the large tensions and voltage differences at the edge.

Der Erfindung liegt die Aufgabe zugrunde, einen Verschluss zu schaffen, der sowohl dem erhöhten Innendruck beim Pasteurisieren und/oder Sterilisieren als auch der erhöhten Temperatur ohne wesentliche Formveränderung widersteht.The invention has for its object to provide a closure that withstands both the increased internal pressure during pasteurization and / or sterilization and the increased temperature without significant change in shape.

Eine weitere Aufgabe der Erfindung besteht darin, den Verschluss derart auszubilden, dass dieser in einem einzigen Arbeitsgang herstellbar ist. Insbesondere muss eine einfache Ausformung aus dem Spritzwerkzeug gegeben sein.Another object of the invention is to design the closure in such a way that it can be produced in a single operation. In particular, there must be a simple shape from the injection mold.

Diese Aufgaben werden nach der Erfindung gemäss den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst.These objects are achieved according to the invention according to the characterizing features of patent claim 1.

Es ist nun möglich, eine einwandfreie Abdichtung zwischen dem Verschluss und dem Flaschenhals zu gewährleisten, unabhängig davon, ob in der Flasche ein Ueberdruck herrscht oder nicht.It is now possible to ensure a perfect seal between the closure and the bottle neck, regardless of whether there is overpressure in the bottle or not.

Weitere vorteilhafte Ausführungsformen sind in den abhängigen Ansprüchen beschrieben.Further advantageous embodiments are described in the dependent claims.

Als weiterer Vorteil der Erfindung wirken die Rippen auf dem Verschlussboden, weil diese eine übermässige Durchbiegung verhindern.As a further advantage of the invention, the ribs act on the closure bottom because they prevent excessive deflection.

Die gewölbte Ausbildung des Verschlussbodens ist eine weitere vorteilhafte Massnahme zur Verhinderung der Dehnung des Verschlusses während der Erhitzung und zur Reduktion der Spannungen im Verschluss.The curved design of the closure base is a further advantageous measure to prevent the closure from stretching during heating and to reduce the stresses in the closure.

Anhand eines illustrierten Ausführungsbeispieles wird die Erfindung näher erläutert. Es zeigen:

  • Figur 1 einen Querschnitt durch einen Verschluss,
  • Figur 2 einen Querschnitt durch den auf dem Flaschenhals aufgeschraubten Verschluss (Flasche ohne oder mit geringem Ueberdruck auf der linken Hälfte, mit Ueberdruck auf der rechten Hälfte).
The invention is explained in more detail using an illustrated exemplary embodiment. Show it:
  • FIG. 1 shows a cross section through a closure,
  • 2 shows a cross section through the closure screwed onto the bottle neck (bottle without or with a slight overpressure on the left half, with overpressure on the right half).

Der Schraubverschluss 1 gemäss Querschnitt in Figur 1 weist einen Verschlussboden 3 und einen Verschlussmantel 5 mit einem Gewinde 7 auf. Auf der Innenseite des Bodens 3 ist konzentrisch zu diesem eine umlaufende Rippe in der Gestalt einer elastisch biegsamen Lippe 9 angebracht. Der mittlere Durchmesser dl der Lippe 9 nimmt in Richtung auf deren Dichtkante 11 ab. Am Mantel 5 ist über dem Ende des Gewindes 7 eine weitere, im wesentlichen parallel zur Symmetrieachse A des Verschlusses 1 verlaufende Rippe 13 angeordnet. Die Lippe 9 weist in diesem Beispiel einen trapezförmigen Querschnitt auf, die Rippe 13 ein der Flaschenmündung angepasstes und deren äussere Kontur umschliessendes Profil, im Beispiel nach Figur 2 eine konkave Ausnehmung 37, die dem Radius am Flaschenhals 19 entspricht.The screw cap 1 according to the cross section in FIG. 1 has a closure base 3 and a closure jacket 5 with a thread 7. On the inside of the bottom 3, a circumferential rib in the form of an elastically flexible lip 9 is attached concentrically to the bottom. The average diameter dl of the lip 9 decreases in the direction of its sealing edge 11. On the jacket 5 there is another, essentially parallel to the symmetry, above the end of the thread 7 Axis A of the closure 1 extending rib 13 is arranged. In this example, the lip 9 has a trapezoidal cross section, the rib 13 has a profile adapted to the bottle mouth and enclosing its outer contour, in the example according to FIG. 2 a concave recess 37 which corresponds to the radius at the bottle neck 19.

Der Durchmesser d2 an der Dichtkante 17 der Rippe 13 ist kleiner als der Aussendurchmesser d3 des Flaschenhalses 19 an dessen oberem Ende 31 (Figur 2).The diameter d2 at the sealing edge 17 of the rib 13 is smaller than the outer diameter d3 of the bottle neck 19 at its upper end 31 (FIG. 2).

Auf der Aussenseite des Verschlusses sind Rippen 21 angebracht, die radial vom Zentrum 30 des Bodens 3 nach aussen verlaufen und auch den Mantel 5 umfassen können.On the outside of the closure, ribs 21 are attached, which extend radially outwards from the center 30 of the base 3 and can also include the casing 5.

Der Boden 3 ist bogenförmig gekrümmt, wobei der Radius Rl gleich oder grösser ist als der halbe Durchmesser d3 des Flaschenhalses 19. Im bogenförmigen Abschnitt 23 zwischen dem Boden 3 und dem Mantel 5 weist der Verschluss 1 eine Krümmung mit Radius R2 auf. Die Radien R2 und Rl können in einem Verhältnis von l : 2 bis 1 : 10 stehen, vorzugsweise in einem Verhältnis 1 : 4.The base 3 is curved in an arc shape, the radius R1 being equal to or greater than half the diameter d3 of the bottle neck 19. In the arcuate section 23 between the base 3 and the jacket 5, the closure 1 has a curvature with radius R2. The radii R2 and R1 can be in a ratio of 1: 2 to 1:10, preferably in a ratio of 1: 4.

In Figur 2 ist der Verschluss 1 auf den mit einem Gewinde 25 versehenen Hals 19 einer Flasche 29 aufgeschraubt. Auf der linken Hälfte der Figur 2 ist der Verschluss 1 gezeigt, wenn in der Flasche 29 kein oder nur ein sehr geringer Ueberdruck gegenüber der Umgebung herrscht; die rechte Hälfte zeigt den Verschluss 1, wie er durch den Ueberdruck und die Temperaturerhöhung, z.B. beim Sterilisieren, ausgeweitet wird.In Figure 2, the closure 1 is screwed onto the threaded neck 25 of a bottle 29. The closure 1 is shown on the left half of FIG. 2 when there is no or only a very small one in the bottle 29 There is overpressure in relation to the surroundings; the right half shows the closure 1 as it is expanded by the excess pressure and the temperature increase, for example during sterilization.

Beim drucklosen Zustand liegt die Lippe 9 auf der kreisringförmigen Stirnfläche 33 des gewindelosen Abschnittes 35 am Flaschenhals 19 auf. Die Dichtkante 11 wird durch die beim Aufschrauben erzeugte Spannkraft infolge der geneigten Ausbildung der Lippe 9 gegen das Zentrum gedrückt.In the depressurized state, the lip 9 rests on the annular end face 33 of the threadless section 35 on the bottle neck 19. The sealing edge 11 is pressed against the center by the clamping force generated when screwing on due to the inclined design of the lip 9.

Der Verschluss arbeitet bei steigendem Innendruck im Gebinde wie der Deckel eines Druckbehälters. Bei dünnwandigen Druckbehältern mit flachem Boden ist die Materialspannunq im Boden nach der Formel

Figure imgb0001
definiert. (p ist der innere Druck, D der Durchmesser des Deckels und SA seine Wandstärke.) Die Spannung steigt mit der quadratischen Potenz des Durchmessers.With increasing internal pressure in the container, the closure works like the lid of a pressure vessel. For thin-walled pressure vessels with a flat bottom, the material tension in the bottom is based on the formula
Figure imgb0001
 Are defined. (p is the internal pressure, D is the diameter of the cover and SA is its wall thickness.) The voltage increases with the quadratic power of the diameter.

Druckbehälter mit bombiertem Boden sind zweckmässiger. Wenn der Boden eine halbe Kugel ist, beträgt die Materialspannung

Figure imgb0002
ist der Radius der Kugel, p der innere Behälterdruck und SB die Wandstärke des kugelförmigen Bodens ). Wenn wir jetzt einen Ausgleich zwischen TA und TB suchen, bei gleichen Werten von p und D (resp. RS = D), finden wir, dass SA = √DSB.Pressure vessels with a cambered bottom are more appropriate. If the bottom is half a ball, the material tension is
Figure imgb0002
 is the radius of the sphere, p is the inner container pressure and SB is the wall thickness of the spherical bottom). If we now look for a balance between TA and TB, with the same values of p and D (or RS = D), we find that SA = √DSB.

Mit anderen Worten muss ein Verschluss mit flachem Boden eine Wandstärke von 5,3 mm haben, um demselben Behälter-innendruck zu widerstehen wie ein kugelförmiger Verschuss mit 1 mm Wandstärke, wenn der Flaschenhals einen Durchmesser von 28 mm gemäss Normierung MC-A hat.In other words, a flat-bottom closure must have a wall thickness of 5.3 mm in order to withstand the same internal container pressure as a spherical closure with a wall thickness of 1 mm if the bottle neck has a diameter of 28 mm according to the MC-A standard.

Die Wirkung des Druckes auf die Materialspannungen im Uebergang zwischen Boden und zylindrischem Aussenmantel ist auch sehr unterschiedlich, ob der Boden flach liegt und einen Winkel von 90° zum Mantel hat, oder ob er bombiert ist und einen sanften, mit grossem Radius gebildeten Uebergang aufweist.The effect of the pressure on the material tensions in the transition between the base and the cylindrical outer shell also varies greatly, whether the base is flat and has an angle of 90 ° to the shell, or whether it is cambered and has a smooth transition with a large radius.

Im ersten Fall entstehen hohe Biegespannungen in der Uebergangszone, die die Reissspannung des Mantels übersteigen. Im zweiten Fall, wo die Kugel in den zylindrischen Aussenmantel mündet, entstehen keine Biegespannungen, sonst nur eine sehr wenig unterschiedliche Ausdehnung des Umfanges. Um gegen dieseletzte Erscheinung zu wirken, ist es vorteilhaft, den Verschlussboden als Teil einer Elipse zu bilden, mit sanften, relativ grossen Uebergangsradien zum Aussenmantel.In the first case, high bending stresses occur in the transition zone, which exceed the tensile stress of the jacket. In the second case, where the ball ends in the cylindrical outer jacket, there are no bending stresses, otherwise there is only a very little different expansion of the circumference. In order to counteract this last appearance, it is advantageous to form the closure bottom as part of an ellipse, with gentle, relatively large transition radii to the outer jacket.

Die Wirkung der erhöhten Temperatur ist materialabhängig (Ausdehnungskoeffizient). Bei den Massenkunststoffen sind die Koeffiziente für verschiedene Materialien etwa gleich. Wichtig ist, dass der Verlauf der Dehnungskoeffiziente bei bestimmtem mechanischem (Druck) und thermischen Belastungen während deren Wirkungszeit klein und konstant bleibt. Das ist zusammen mit, durch die geschickte Profilierung des Bodens, kleine Materialspannungen, die Voraussetzung für die Herstellung eines während der Pasteurisation oder Sterilisation dicht bleibenden Verschlusses.The effect of the increased temperature depends on the material (coefficient of expansion). In the case of bulk plastics, the coefficients for different materials are approximately the same. It is important that the course of the expansion coefficients at certain mechanical (pressure) and thermal loads during which the duration of action remains small and constant. Together with the skilful profiling of the base, this means that small material tensions are the prerequisite for producing a closure that remains tight during pasteurization or sterilization.

Steigt beim Pasteurisieren oder Sterilisieren der,Druck in der Flasche, so hebt sich der Boden 3 des Verschlusses 1, und der Mantel 5 weitet sich nur um einige Zehntelsmillimeter. Einerseits wegen der Eigenelastizität verbleiben die beiden Lippen 9 und 13 in Anlage mit dem Flaschenhals 19, und andererseits wird die Lippe 9 durch den steigenden Innendruck nach aussen gedrückt. Diese quer zur Lippe 9 wirkende Kraft presst deren Dichtkante mit steigendem Druck immer stärker an die entsprechende Auflagestelle, d.h. die Stirnfläche 33.If the pressure in the bottle increases during pasteurization or sterilization, the bottom 3 of the closure 1 rises and the casing 5 widens only by a few tenths of a millimeter. On the one hand because of the inherent elasticity, the two lips 9 and 13 remain in contact with the bottle neck 19, and on the other hand the lip 9 is pressed outwards by the increasing internal pressure. This force acting transversely to the lip 9 presses its sealing edge more and more with increasing pressure onto the corresponding contact point, i.e. the end face 33.

Wenn die Lippe 9 als spitz auslaufendes Dreieck ausgebildet ist, legt sich deren feine Dichtkante praktisch übergangsfrei an der Auflagestelle an.If the lip 9 is designed as a tapering triangle, its fine sealing edge lies on the support point practically without transition.

An Stelle von je einer auf die Stirnfläche 33 und auf den Abschnitt 35 wirkenden Lippe 9 bzw. 13 können auch zwei oder mehr Lippen 9 nebeneinander angebracht sein und sowohl als Direkt- wie auch als Labyrinthdichtung wirken.Instead of one lip 9 or 13 acting on the end face 33 and on the section 35, two or more lips 9 can also be attached next to one another and act both as a direct seal and as a labyrinth seal.

Sofern eine Sicherung des Verschlusses notwendig ist, kann am unteren Rand des Mantels 5 ein Ring 37 angespritzt sein, der beim ersten Oeffnen der Flasche 29 vom Verschluss 1 abgetrennt wird und am Flaschenhals 19 zurückbleibt oder - wenn dies erwünscht ist - in einem oder mehreren Teilen abspringt.If it is necessary to secure the closure, a ring 37 can be molded onto the lower edge of the casing 5, which ring is separated from the closure 1 when the bottle 29 is opened for the first time and remains on the bottle neck 19 or - if this is desired - in one or more parts jumps off.

Der Verschluss 1 kann in herkömmlicher Weise mit sehr einfachen Werkzeugen und bereits für Flaschenverschlüsse bewährten Kunststoffmaterialien gespritzt werden.The closure 1 can be injection molded in a conventional manner with very simple tools and plastic materials that have already been tried and tested for bottle closures.

Claims (7)

1. Schraubverschluss aus Kunststoff für Flaschen mit einer axial auf die Stirnfläche des Gewindeabschnittes zum Aufliegen kommenden, elastisch ausgebildeten Dichtungslippe, dadurch gekennzeichnet, dass der Boden 3 und der Mantel (5) des Verschlusses (1) durch einen bogenförmigen Abschnitt (23) miteinander verbunden sind, und der Boden (3) des Verschlusses (1) gewölbt ist, wobei der Wölbungsradius Rl gleich oder grösser ist als der halbe Durchmesser d3 des Flaschenhalses (19), und dass der Radius R2 des Abschnittes (23) grösser ist als 1/10 des Wölbungsradius Rl.1. Screw cap made of plastic for bottles with an elastically designed sealing lip that comes to rest axially on the end face of the threaded section, characterized in that the base 3 and the casing (5) of the closure (1) are connected to one another by an arcuate section (23) are, and the bottom (3) of the closure (1) is curved, the radius of curvature Rl being equal to or larger than half the diameter d3 of the bottle neck (19), and that the radius R2 of the section (23) is larger than 1 / 10 of the radius of curvature Rl. 2. Schraubverschluss nach Anspruch 1, dadurch gekennzeichnet, dass der Boden (3) des Verschlusses (1) einen Querschnitt einer halben Elipse aufweist.2. Screw cap according to claim 1, characterized in that the bottom (3) of the closure (1) has a cross section of half an ellipse. 3. Schraubverschluss nach Anspruch 1, dadurch gekennzeichnet, dass der Boden (3) des Verschlusses (1) einen Querschnitt einer halben Kugel aufweist.3. Screw cap according to claim 1, characterized in that the bottom (3) of the closure (1) has a cross section of half a sphere. 4. Schraubverschluss nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass auf der Oberfläche des Verschlusses (1) radial verlaufende, sich im Zentrum (30) treffende Verstärkungsrippen (21) angebracht sind.4. Screw cap according to one of claims 1 to 4, characterized in that on the surface of the closure (1) radially extending, in the center (30) meeting reinforcing ribs (21) are attached. 5. Schraubverschluss nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass ausserhalb der Dichtungslippe (9) eine im wesentlichen parallel zur Symmetrieachse (A) des Verschlusses (1) verlaufende Rippe (13) angeordnet ist, deren Profil demjenigen der Kontur des Flaschenhalses (19) angepasst ist.5. Screw cap according to one of the preceding claims, characterized in that outside of the sealing lip (9) is arranged a rib (13) extending essentially parallel to the axis of symmetry (A) of the closure (1), the profile of which corresponds to that of the contour of the bottle neck (19 ) is adjusted. 6. Schraubverschluss nach Anspruch 5, dadurch gekennzeichnet, dass das Profil der Rippe (13) eine Ausnehmung (37) mit einem Radius entsprechend dem Radius am Flaschenhals (19) aufweist.6. Screw cap according to claim 5, characterized in that the profile of the rib (13) has a recess (37) with a radius corresponding to the radius on the bottle neck (19). 7. Schraubverschluss nach Anspruch 6, dadurch gekennzeichnet, dass der Durchmesser (d2) an der Dichtkante (17) der Rippe (13) kleiner ist als der Aussendurchmesser (d3) des Flaschenhalses (19) an dessen oberem Ende (31).7. Screw cap according to claim 6, characterized in that the diameter (d2) at the sealing edge (17) of the rib (13) is smaller than the outer diameter (d3) of the bottle neck (19) at its upper end (31).
EP85810401A 1984-10-05 1985-09-04 Plastic screw closure Expired - Lifetime EP0178253B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810401T ATE58695T1 (en) 1984-10-05 1985-09-04 PLASTIC SCREW CAP.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH478884 1984-10-05
CH4788/84 1984-10-05
CH66385 1985-02-14
CH663/85 1985-02-14

Publications (2)

Publication Number Publication Date
EP0178253A1 true EP0178253A1 (en) 1986-04-16
EP0178253B1 EP0178253B1 (en) 1990-11-28

Family

ID=25685288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810401A Expired - Lifetime EP0178253B1 (en) 1984-10-05 1985-09-04 Plastic screw closure

Country Status (4)

Country Link
US (1) US4645088A (en)
EP (1) EP0178253B1 (en)
CA (1) CA1249548A (en)
DE (1) DE3580737D1 (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
EP0312574A1 (en) * 1987-04-27 1989-04-26 American National Can Company Linerless cap closure
EP0565130A1 (en) * 1992-04-10 1993-10-13 Jürgen Sooth Closure cap
DE19515687A1 (en) * 1995-04-28 1996-11-21 Helmut Patzelt Lock for container esp. flasks

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US4726484A (en) * 1986-12-19 1988-02-23 Captive Plastics, Inc. Package employing unique closure seal and container therefor
DE3732112A1 (en) * 1987-09-24 1989-04-13 Pfefferkorn & Co BOTTLE STOPPER, ESPECIALLY FOR SPARKLING BOTTLES WITH SCREW THREADED MOUTH
US5638972A (en) * 1988-06-17 1997-06-17 Druitt; Rodney Malcolm Linerless closure for carbonated beverage container
US4905852A (en) * 1989-05-26 1990-03-06 Zapata Industries, Inc. Plastic closure with improved seal
US5259522A (en) * 1992-08-14 1993-11-09 H-C Industries, Inc. Linerless closure
US5449078A (en) * 1994-07-08 1995-09-12 Thermar Corporation Combination of a container and a safety cap therefor
US6427881B1 (en) * 2001-10-09 2002-08-06 Rexam Medical Packaging Inc. Edge seal closure
US20040188375A1 (en) * 2002-07-03 2004-09-30 Fabricas Monterrey, S.A. De C.V. Linerless plastic closure with a sealing lip
DE102004025466B4 (en) * 2004-05-25 2011-07-07 Georg Menshen GmbH & Co. KG, 57413 cap
US7434703B2 (en) * 2004-09-27 2008-10-14 Rexam Prescription Products Inc. Child-resistant tamper-indicating package
US7922017B2 (en) * 2005-05-12 2011-04-12 Rexam Prescription Products Inc. Child-resistant closure, container and package convertible to non-child-resistant operation
FR2899567B1 (en) * 2006-04-07 2010-08-13 Eaux Minerales D Evian Saeme S CLOSURE SYSTEM FOR CONTAINER
DE102007033621B4 (en) * 2007-07-17 2022-06-15 Krones Aktiengesellschaft Plastic container with grip groove
BR112021022967A2 (en) * 2019-06-17 2022-01-04 Unilever Ip Holdings B V Oil applicator for hair and applicator with closure

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US4392579A (en) * 1981-10-21 1983-07-12 Owens-Illinois, Inc. Closure with domed portion
US4429802A (en) * 1982-05-28 1984-02-07 Anchor Hocking Corporation Linerless closure cap

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GB925647A (en) * 1959-10-12 1963-05-08 Dover Molded Products Company Improvements in or relating to plastic sealing caps and method for the production thereof
GB960443A (en) * 1961-01-13 1964-06-10 Australian Glass Manufacturers Improvements in closures for containers such as bottles
CH607702A5 (en) * 1975-08-18 1978-10-13 Obrist Ag Albert Bottle closure, in particular a screw closure, and process for fastening the closure
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US4269320A (en) * 1978-06-30 1981-05-26 Maxcap, Inc. Blow molded plastic bottle and anti-tamper cap
US4416383A (en) * 1981-10-29 1983-11-22 Frahm Carl E Closure and sealing device

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US4392579A (en) * 1981-10-21 1983-07-12 Owens-Illinois, Inc. Closure with domed portion
US4429802A (en) * 1982-05-28 1984-02-07 Anchor Hocking Corporation Linerless closure cap

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0312574A1 (en) * 1987-04-27 1989-04-26 American National Can Company Linerless cap closure
EP0312574A4 (en) * 1987-04-27 1990-10-10 American National Can Company Linerless cap closure
EP0565130A1 (en) * 1992-04-10 1993-10-13 Jürgen Sooth Closure cap
DE19515687A1 (en) * 1995-04-28 1996-11-21 Helmut Patzelt Lock for container esp. flasks

Also Published As

Publication number Publication date
US4645088A (en) 1987-02-24
CA1249548A (en) 1989-01-31
EP0178253B1 (en) 1990-11-28
DE3580737D1 (en) 1991-01-10

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