EP0178253B1 - Plastic screw closure - Google Patents

Plastic screw closure Download PDF

Info

Publication number
EP0178253B1
EP0178253B1 EP85810401A EP85810401A EP0178253B1 EP 0178253 B1 EP0178253 B1 EP 0178253B1 EP 85810401 A EP85810401 A EP 85810401A EP 85810401 A EP85810401 A EP 85810401A EP 0178253 B1 EP0178253 B1 EP 0178253B1
Authority
EP
European Patent Office
Prior art keywords
closure
bottle
rib
base
radius
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 - Lifetime
Application number
EP85810401A
Other languages
German (de)
French (fr)
Other versions
EP0178253A1 (en
Inventor
Alberto Menichetti
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.)
Gebr HOFFMANN AG
Original Assignee
Gebr HOFFMANN AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25685288&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0178253(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Gebr HOFFMANN AG filed Critical Gebr HOFFMANN AG
Priority to AT85810401T priority Critical patent/ATE58695T1/en
Publication of EP0178253A1 publication Critical patent/EP0178253A1/en
Application granted granted Critical
Publication of EP0178253B1 publication Critical patent/EP0178253B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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 and glued or injected at the bottom of the closure.
  • 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 setting 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 of the type mentioned in the preamble of claim 1, which resists both the increased internal pressure during pasteurization and / or sterilization and the elevated temperature without significant change in shape and ensures a perfect seal.
  • the closure should be designed such that it can be manufactured in a single operation.
  • a simple shape from the injection mold must be provided.
  • the object is achieved according to the invention with the features of claim 1.
  • the arched elliptical or spherical shape of the floor can be dimensioned appropriately compared to a flat floor with a smaller wall thickness are manufactured. This is important for mass articles of this type because of the material savings.
  • 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 d1 of the lip 9 decreases in the direction of its sealing edge 11.
  • a further rib 13, which runs essentially parallel to the axis of symmetry A of the closure 1, is arranged on the jacket 5 above the end of the thread 7.
  • 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 the shape of an arc, the radius being equal to or greater than half the diameter d3 of the bottle neck 19.
  • the closure 1 has a radius of curvature.
  • the radii of the transition curve and the bottom 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 slight excess pressure in the bottle 29 with respect to the surroundings; the right half shows the closure 1 as it is caused by the excess pressure and the temperature increase, e.g. when sterilizing, is expanded.
  • 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 the diameter of the cover and SA its wall thickness). The voltage increases with the quadratic power of the diameter.
  • a flat-bottomed cap must have a wall thickness of 5.3 mm in order to withstand the same internal container pressure as a spherical cap with a wall thickness of 1 mm if the bottle neck has a diameter of 28 mm in accordance with 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 90s 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.
  • a ring 137 can be molded onto the lower edge of the jacket 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 desired, in one or more parts jumps off.
  • the closure 1 can be injection molded in a conventional manner using very simple tools made of plastic materials that have already been tried and tested for bottle closures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Description

Die Erfindung betrifft einen Schraubverschluss gemäss dem Oberbegriff des Patentanspruches 1.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 gebrächlichsten 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 and glued or injected at the bottom of the closure.

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 operations 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 setting 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 Autoklaven von bis zu einer Stunde Werte erreichen, die eine zuverlässige Abdichtung der Flansche 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 tensions 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 flanges 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.

Es ist ferner aus der US-A-4 392 579 ein aus einem einzigen Teil bestehender Kunststoffverschluss mit den im Oberbegriff des Anspruches 1 angegebenen Merkmalen bekanntgeworden, dessen mit einem Innengewinde versehener, auf ein Gebinde (Flansche) aufschraubbarer Mantel mittels eines bogenförmigen Abschnittes in ein flachen oder gewölbten Boden übergeht. Zur Abdichtung sind den Flaschenhals entweder innen hintergreifende oder auf dessen schräg nach innen verlaufender, trichterförmiger Halsinnenseite aufliegende elastische Lippen vorgesehen, die sich mit erhöhtem Innendruck beim Erhitzen des Füllgutes an den Flaschenhals anlegen. Während bei der Ausführung mit hintergreifender Lippe die genaue vertikale Lage des Verschlusses bezüglich der Lage des Flaschenhalses für die Dichtwirkung nicht kritisch ist, wirkt sich dieser Mangel bei der nur aufliegenden Lippe insofern nachteilig aus, als sich die Lage der Lippe nach der Tiefe des Einschraubens des Verschlusses richtet und sie dadurch unterschiedlich stark zusammengedrückt wird. Dies zieht eine wellenförmige Verformung der Lippe auf der Auflagefläche des Flaschenhalses nach sich, so dass sich diese teilweise abhebt und dadurch undicht wird.From US-A-4 392 579 a single-part plastic closure with the features specified in the preamble of claim 1 has become known, the jacket of which is provided with an internal thread and can be screwed onto a bundle (flanges) by means of an arcuate section flat or arched floor. For sealing purposes, the bottle neck is provided either with gripping lips on the inside or resting on the inside of the funnel-shaped neck, which lies obliquely inwards and which press against the bottle neck with increased internal pressure when the contents are heated. While the exact vertical position of the closure with regard to the position of the bottle neck is not critical for the sealing effect in the embodiment with the lip engaging behind, this deficiency has a disadvantageous effect in that the lip only rests in that the position of the lip depends on the depth of screwing in of the Closure aligns and it is thereby compressed to different degrees. This results in a wave-like deformation of the lip on the support surface of the bottle neck, so that it partially lifts off and becomes leaky.

Der Erfindung liegt die Aufgabe zugrunde, einen Verschlüss der im Oberbegriff des Anspruches 1 genannten Art zu schaffen, der sowohl dem erhöhten Innendruck beim Pasteuerisieren und/oder Sterilisieren als auch der erhöhten Temperatur ohne wesentliche Formveränderung wiedersteht und eine einwandfreie Abdichtung gewährleistet.The invention has for its object to provide a closure of the type mentioned in the preamble of claim 1, which resists both the increased internal pressure during pasteurization and / or sterilization and the elevated temperature without significant change in shape and ensures a perfect seal.

Dabei soll der Verschluss derart ausgebildet sein, dass er in einem einzigen Arbeitsgang herstellbar ist. Insbesondere muss eine einfache Ausformung aus dem Spritzwerkzeug gegeben sein. Die Aufgabe wird nach der Erfindung mit den Merkmalen des Patentanspruches 1 gelöst.The closure should be designed such that it can be manufactured in a single operation. In particular, a simple shape from the injection mold must be provided. The object is achieved according to the invention with the features of claim 1.

Es ist nun möglich, eine einwandfreie Abdichtung zwischen dem Verschluss und dem Flaschenhals zu gewärleisten, 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.

Durch die auf Grund der Formgebung verminderte Dehnung des Verschlusses bei zeitweilig erhöhtem Innendruck und erhöhter Temperatur des Füllgutes kann bei passender Dimensionierung der gewölbten elliptischen oder kugelförmigen Gestalt des Bodens, dieser gegenüber einem flachen Boden mit geringerer Wandstärke gefertigt werden. Dies ist bei Massenartikeln dieser Art wegen der Materialersparnis von Bedeutung.Due to the reduced shape of the closure due to the shape, with temporarily increased internal pressure and increased temperature of the contents, the arched elliptical or spherical shape of the floor can be dimensioned appropriately compared to a flat floor with a smaller wall thickness are manufactured. This is important for mass articles of this type because of the material savings.

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

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 with the aid of an illustrated 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 d1 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 d1 of the lip 9 decreases in the direction of its sealing edge 11. A further rib 13, which runs essentially parallel to the axis of symmetry A of the closure 1, is arranged on the jacket 5 above the end of the thread 7. 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 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 auf. Die Radien des übergangsbogens und des Bodens können in einem Verhältnis von 1:2 bis 1:10 stehen, vorzugsweise in einem Verhältnis 1:4.The base 3 is curved in the shape of an arc, the radius 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 casing 5, the closure 1 has a radius of curvature. The radii of the transition curve and the bottom 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 slight excess pressure in the bottle 29 with respect to the surroundings; the right half shows the closure 1 as it is caused by the excess pressure and the temperature increase, e.g. when sterilizing, is expanded.

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 Materialspannung 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 the diameter of the cover and SA 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
(RS=D/2 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/2), finden wir, dass SA= ν DSB.Pressure vessels with a cambered bottom are more appropriate. If the bottom is half a ball, the material tension is
Figure imgb0002
 (RS = D / 2 is the radius of the sphere, p is the inner pressure of the container 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 / 2), we find that SA = ν DSB.

Mit anderen Worten muss ein Verschluss mit flachem Boden eine Wandstärke von 5,3 mm haben, um demselben Behälterinnendruck zu wiederstehen wie ein kugelförmiger Verschluss mit 1 mm Wandstärke, wenn der Flaschenhals einen Durchmesser von 28 mm gemäss Normierung MC-A hat.In other words, a flat-bottomed cap must have a wall thickness of 5.3 mm in order to withstand the same internal container pressure as a spherical cap with a wall thickness of 1 mm if the bottle neck has a diameter of 28 mm in accordance with 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 90s 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 90s 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 diese letzte Erscheinung zur wirken, ist es vorteilhaft, den Verschlussboden als Teil einer Ellipse 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 phenomenon, it is advantageous to form the closure base 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 Koeffizienten für verschiedene Materialen etwa gleich. Wichtig ist, dass der Verlauf der Dehnungskoeffizienten bei bestimmtem mechanischem (Druck) und thermischen Belastungen während deren Wirkungszeit klein und konstant bleibt. Das ist zusammen mit, durch die geschickte Profilierung des Bodens, kleinen 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 remains small and constant with certain mechanical (pressure) and thermal loads during their working time. Together with the skilful profiling of the base and small material tensions, this is 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.

Sofern eine Sicherung des Verschlusses notwendig ist, kann am unteren Rand des Mantels 5 ein Ring 137 angesprizt 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 137 can be molded onto the lower edge of the jacket 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 desired, in one or more parts jumps off.

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

Claims (6)

1. Screw closure (1) formed from plastics material for bottles, having an internal thread (7) and a resilient, circumferential sealing lip (9), which comes to rest axially on the horizontal end face (33) of the threaded portion (25) of the associated neck (19) of the bottle, wherein the base (3) and the casing (5) of the closure (1) are interconnected by means of an arcuate portion (23), and the base (3) of the closure (1) is curved, characterised in that the radius of curvature of the base (3) is identical to or greater than half the external diameter (d3) of the neck (19) of the bottle at its upper end, and the radius of the arcuate portion (23) is greater than 1/10 of the radius of curvature, in that also a rib (13) is disposed radially externally of the sealing lip (9), said rib extending substantially parallel to the axis of symmetry (A) of the closure (1) and concentrically with the sealing lip (9), the profile at the end of said rib being adapted to that of the outer edge of the mouth of the neck (19) of the bottle, on which it sits in the operative state, and fitting closely with its whole surface on this configuration, and in that the lip (9) is inwardly inclined and has a sealing edge (11) which is urged towards the centre by the tensional force produced during the screwing-on process.
2. Screw closure according to Claim 1, characterised in that the base (3) of the closure (1), together with the arcuate portions (23), has a substantially semi-elliptical cross-section.
3. Screw closure according to Claim 1, characterised in that the base (3) of the closure (1), together with the arcuate portions (23), has a dome-shaped cross-section.
4. Screw closure according to one of Claims 1 to 3, characterised in that radially extending reinforcing ribs (21), which meet in the centre (30), are mounted on the outer surface of the closure (1).
5. Screw closure according to Claim 4, characterised in that the profile of the rib (13) has a recess (37) with a radius corresponding to the radius of the external rounded configuration of the associated neck (19) of the bottle.
6. Screw closure according to Claim 5, characterised in that the internal diameter (d2) of the sealing edge (17) of the rib (13) is smaller than the external diameter (d3) of the associated neck (19) of the bottle 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
CH663/85 1985-02-14
CH66385 1985-02-14

Publications (2)

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

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4726484A (en) * 1986-12-19 1988-02-23 Captive Plastics, Inc. Package employing unique closure seal and container therefor
US4741447A (en) * 1987-04-27 1988-05-03 American National Can Company Linerless cap closure
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
DE4212141A1 (en) * 1992-04-10 1993-10-14 Juergen Sooth Sealing cover
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
DE19515687C2 (en) * 1995-04-28 1997-08-28 Helmut Patzelt Closure for vessels, especially bottles
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
WO2020254088A1 (en) * 2019-06-17 2020-12-24 Unilever N.V. A hair oil applicator

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2339540A1 (en) * 1976-01-28 1977-08-26 Bouchons Plastiques IMPROVEMENTS TO SCREW CAPS
US4269320A (en) * 1978-06-30 1981-05-26 Maxcap, Inc. Blow molded plastic bottle and anti-tamper cap
US4392579A (en) * 1981-10-21 1983-07-12 Owens-Illinois, Inc. Closure with domed portion
US4416383A (en) * 1981-10-29 1983-11-22 Frahm Carl E Closure and sealing device
US4429802A (en) * 1982-05-28 1984-02-07 Anchor Hocking Corporation Linerless closure cap

Also Published As

Publication number Publication date
EP0178253A1 (en) 1986-04-16
DE3580737D1 (en) 1991-01-10
CA1249548A (en) 1989-01-31
US4645088A (en) 1987-02-24

Similar Documents

Publication Publication Date Title
EP0178253B1 (en) Plastic screw closure
DE7702165U1 (en) Screw cap for the neck, which is provided with an external thread, of containers under internal pressure, for example bottles
EP0147423B1 (en) Plastic closure
DE69916520T2 (en) Tamper-evident closure and neck of a bottle
DE60034666T2 (en) CONTAINERS COVER WITH PRESSURE RESPONSIVE WALL PARTS
DE68920280T2 (en) Tamper-evident closure for a container and screw-on procedure without loading from above.
DE3689726T2 (en) LOCKING SEAL AND METHOD FOR THEIR PRODUCTION.
EP0076778A1 (en) Closure of plastics material
DE3114613A1 (en) SEALING CAP FOR CONTAINERS
DE60114050T2 (en) DICHTPROPFEN FOR USER FRIENDLY CLOSURE ARRANGEMENT
CH369326A (en) Container closure with closure plug made of thermoplastic material
DE2453963A1 (en) PRESS-ON AND SCREW-ON LOCKING FOR GLASS CONTAINERS FOR PACKAGING OXYGEN-SENSITIVE PRODUCTS
DE68917938T4 (en) LID WITHOUT INTERNAL CLOTHING FOR CARBONATED BEVERAGE CONTAINERS.
DE2731882A1 (en) LOCKING DEVICE FOR PACKAGING CONTAINER
DE1432275A1 (en) Screw cap
DE2139910A1 (en) Container with threaded mouthpiece closed by crown cork
EP0529383B2 (en) Plastic screw cap for pressurized bottles
EP0146011A2 (en) Container with lid
DE2831746C2 (en) Inlay-free plastic cap
CH635795A5 (en) SCREW CAP FOR A CONTAINER.
DE2704454C2 (en) Container lock
DE2756350C2 (en) Lining-free cap made of plastic
DE3426427A1 (en) BOTTLE CAP
DE69302966T2 (en) One-piece plastic closure
DE3218937A1 (en) BOTTLE CAP

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19860910

17Q First examination report despatched

Effective date: 19870706

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 58695

Country of ref document: AT

Date of ref document: 19901215

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3580737

Country of ref document: DE

Date of ref document: 19910110

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
EPTA Lu: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 85810401.1

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20000812

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20000821

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20000828

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20000914

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20000915

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20000921

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20000927

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 20000929

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20000930

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010904

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010904

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010904

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010905

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010930

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010930

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010930

BERE Be: lapsed

Owner name: GEBRUDER HOFFMANN A.G.

Effective date: 20010930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020501

EUG Se: european patent has lapsed

Ref document number: 85810401.1

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020531

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20020401

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20020401

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO