EP0661218A1 - Plastic closure cap with early venting inner seal - Google Patents

Plastic closure cap with early venting inner seal Download PDF

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Publication number
EP0661218A1
EP0661218A1 EP94810648A EP94810648A EP0661218A1 EP 0661218 A1 EP0661218 A1 EP 0661218A1 EP 94810648 A EP94810648 A EP 94810648A EP 94810648 A EP94810648 A EP 94810648A EP 0661218 A1 EP0661218 A1 EP 0661218A1
Authority
EP
European Patent Office
Prior art keywords
inner seal
closure cap
ventilation
cap according
sealing
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.)
Granted
Application number
EP94810648A
Other languages
German (de)
French (fr)
Other versions
EP0661218B1 (en
Inventor
Georg Pfefferkorn
Michael Kirchgessner
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.)
obrist Closures Switzerland
obrist Closures Switzerlandroemerstrasse 83 Ch 41
Original Assignee
Crown Cork 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
Application filed by Crown Cork AG filed Critical Crown Cork AG
Publication of EP0661218A1 publication Critical patent/EP0661218A1/en
Application granted granted Critical
Publication of EP0661218B1 publication Critical patent/EP0661218B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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
    • 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
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1672—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by manual actuation of the closure or other element
    • B65D51/1688—Venting occurring during initial closing or opening of the container, by means of a passage for the escape of gas between the closure and the lip of the container mouth, e.g. interrupted threads
    • 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
    • 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
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
    • B65D51/1661—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of a passage for the escape of gas between the closure and the lip of the container mouth
    • 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 screwable closure cap made of plastic material according to the preamble of claim 1.
  • screwable is to be understood here such that both closure caps with a screw thread and bayonet closures are included.
  • Such caps have been known and used for a long time and are mainly used for closing bottles for carbonated soft drinks.
  • the bottles are often returnable bottles made of glass or PET. Since the container mouth is often damaged, particularly in the case of reusable bottles, inner seals protruding into the container mouth are preferably used to seal the containers. As a result, the primary sealing section is moved somewhat into the interior of the bottle mouth. In this way, an optimal sealing effect is achieved even when the mouth area is damaged.
  • EP-118 267 shows such a closure cap.
  • Inner seals of the type mentioned have a circumferential sealing section, the outer diameter of which is somewhat larger than the inner diameter of the bottle mouth. This ensures that the sealing section is pressed against the inner wall of the bottle mouth when the cap is on.
  • An insertion section follows below the sealing section, the outer diameter of which decreases approximately conically downwards, so that it is smaller at the lower end of the inner seal than the diameter of the container mouth. This is necessary to avoid damage Ensure that the inner seal is inserted when the screw cap is screwed on.
  • This configuration of the inner seal means that the upper area of the insertion section can seal the container tightly when the actual sealing section of the inner seal is already outside the container mouth. This leads to an unnecessarily late pressure release when the cap is unscrewed. As such, this disadvantage could be countered by shortening the insertion section. However, a certain length of the same is necessary in order to insert the inner seal reliably and gently.
  • the known inner seals also have the disadvantage that the outer surface of the insertion section, which comes into contact with the container mouth first, has a smooth outer surface. Rough, irregular or damaged areas at the mouth of the container can therefore hardly be smoothed out by the insertion section and there is a risk that the sealing section essential for sealing is damaged.
  • the insertion of the inner seal into the container mouth should not be affected in any way.
  • a further object of the invention is to design the insertion part in such a way that it compensates for unevenness in the container mouth when it is screwed on, so that the sealing part is not damaged when it is screwed on.
  • the inner seal has a sealing section and an insertion section below the sealing section.
  • the sealing section is that part of the Inner seal that touches the inside of the container mouth when the cap is on and forms a seal.
  • the insertion section is used primarily for the reliable and gentle insertion of the inner seal into the container mouth. This can be further divided based on its functions.
  • the foremost section of the insertion section is the centering zone, in which the outside diameter is smaller than the diameter of the container mouth. It centers and guides the inner seal when the cap is put on. After the centering zone there follows a clamping zone in which the outside diameter is larger than the diameter of the container opening.
  • the inner seal When the clamping zone penetrates the container opening, the inner seal is pressed together and thus pre-tensioned.
  • the outer surface of the inner seal In the area of the insertion section, the outer surface of the inner seal has at least one ventilation recess.
  • the venting recess forms a connection to the interior of the container as soon as the sealing part comes out of engagement with the container mouth. It prevents the insertion section from forming a seal with the container mouth and thus ensures that the container is vented at the earliest possible time. This ensures that the internal thread of the sealing cap is securely engaged with the external thread of the neck of the container until the vent is inserted. The risk of the cap suddenly jumping off when unscrewing it due to excessive internal pressure and too late ventilation of the container is thus reduced.
  • venting recess is preferably designed so that it extends at least over the entire height of the clamping zone. This ensures that there is an open air duct as soon as the sealing section is out of engagement with the container mouth.
  • the number of ventilation cutouts as well as their width and depth influence the speed of the ventilation Open the container. It should be noted that the entry zone in the area of the ventilation cutout does not fulfill its guiding function. In order to prevent destruction of the sealing area in the area of the ventilation cutout, it is advantageously ensured that the width of the ventilation cutout does not exceed 1/15 of the circumference of the inner seal.
  • the diameter of the insertion section is to be understood to mean the diameter of the outermost surface, regardless of the ventilation cut-outs. If there are several ventilation cutouts next to each other, the outer surface can be reduced to individual edges. For this reason, the term envelope surface is sometimes used, which means the outer surface without ventilation cutouts.
  • the inner seal is often designed so that its outer diameter in the area of the insertion part decreases towards the lower end.
  • the continuously decreasing, generally conically decreasing outer diameter means that the inner seal is evenly pre-tensioned during screwing on until the sealing section penetrates into the container mouth. During this pretensioning phase, the insertion section lies against the inside edge of the container mouth.
  • the friction that occurs as a result of turning the closure has an equalizing effect on possible unevenness in the mouth area. This friction effect can be specifically increased by suitable design of the ventilation cutout.
  • the insertion section In another, likewise advantageous design of the insertion section, it only has a sliding zone in its lower area, in which the outside diameter decreases towards the lower end.
  • the outer diameter of the inner seal has a local minimum value between the sliding zone and the sealing section, so that at the upper end of said sliding zone there is a locally maximum outer diameter which is larger than the diameter of the container mouth to be closed.
  • This is advantageously chosen to be as large as possible, however, in such a way that it is lifted off the inside wall of the container when the sealing cap is in place as soon as the sealing part penetrates into the container mouth.
  • This configuration has the advantage that when the cap is screwed on, the insertion part lies against the inside surface of the mouth as soon as the sliding part has entered the container mouth.
  • the frictional effect of the insertion section also becomes effective in the area of the inner surface of the mouth.
  • the shape of the ventilation recess itself also has a lasting effect on the friction effect of the insertion section.
  • the friction effect is advantageously increased if cutting edges are provided between venting recesses for leveling irregular or damaged mouth edges of plastic containers.
  • the terms known from machining to define the sheath geometry are used to describe the relevant recess design.
  • the venting recess is to be compared with the gap between two saw teeth.
  • the cap is made of relatively soft plastic, the best results were achieved with a rake angle of around 0 °.
  • the surface of the ventilation cutout, at the front end of the latter when viewed in the screwing-on direction of rotation, represents the clamping surface, which adjoins the envelope surface of the insertion part at approximately a right angle along a cutting edge.
  • the cutting edge is thus aligned so that it can work as a cutting edge when the cap is turned in the screw-on direction.
  • Optimal results are achieved with rake angles in the range of +/- 10 °.
  • this primitive plastic cutting edge no actual machining process can be achieved even with plastic containers. This is also not intended, otherwise plastic chips would fall into the drink. In fact, it is a kind of plastic deformation of ridges and notches, which would actually suggest a negative rake angle.
  • due to the soft cutting material nevertheless achieved the best results with rake angles of approximately 0 °.
  • the sealing cap can therefore be further improved by arranging several ventilation cutouts evenly distributed over the circumference of the inner seal. Particularly good friction properties are achieved if the ventilation cutouts are arranged at equal distances from one another, in particular if a large number of ventilation cutouts are arranged directly next to one another. This reduces the outer surface of the inner seal to individual edges in the area where the ventilation cutouts touch. When the cap is screwed on, the contact surface in the insertion zone is consequently limited to individual edges, which results in high surface pressure. This has a positive effect on the friction and smoothing effect.
  • symmetrical ventilation cutouts can also be used. Out of it this results in a cutting edge geometry with a negative rake angle and a positive clearance angle, both of which have the same value. Similar friction properties are achieved when screwing on and off. Good results are achieved with rake and clearance angles of less than 60 °.
  • Figure 1 shows the sectional view of a container mouth with a closure cap, which was unscrewed until ventilation began.
  • the closure cap consists of a cylindrical cap wall 1 and a cap base 2 that closes it off.
  • An inner seal 4 extends from the inner surface 3 of the cap base coaxially with the cap wall 1 toward the cap opening. If the closure cap is completely screwed onto the container neck, the outer surface of the inner seal touches the inner surface 23 of the container mouth in a limited area. This area is referred to as the sealing section 5.
  • Their outer diameter is larger than the diameter 8 of the container mouth. Below the sealing section follows the insertion section 6, in which the outside diameter decreases conically towards the bottom.
  • the outer surface of the insertion part 6 comes into contact with the container mouth first; the sealing section 5 reaches the container mouth only later.
  • the downward decreasing diameter of the insertion section lies against the inner edge 24 of the container mouth. It centers the inner seal on the container mouth and ensures that it is gently pretensioned before the sealing section 5 reaches the container mouth.
  • the reverse process takes place when the cap is unscrewed. First, the sealing section is pulled out of the mouth of the container, but the inner seal remains preloaded because the insertion section is still against the opening of the container. The inner seal can only widen again when it is unscrewed again, when the insertion section is pulled out of the container mouth.
  • the insertion section When unscrewing, the insertion section remains in contact with the container mouth until the inner seal has expanded to its relaxed normal position.
  • the insertion section is thus divided into two areas: the lower area of the insertion section serves to center the inner seal on the container mouth, and the clamping zone begins there, where the outer diameter of the insertion section reaches the diameter 8 of the container opening.
  • the inner seal In the area of the insertion section, the inner seal has several ventilation openings. These prevent the inner seal from forming a seal when the cap is unscrewed in the area of the clamping zone.
  • the venting recesses 9 In order to ensure that the container is ventilated at the earliest possible point in time, the venting recesses 9 begin directly below the sealing section. In the closure cap shown here, the sealing section is located just outside the container mouth. Gas from the container can flow out through the venting recesses 9 in the direction of the arrow y.
  • FIG. 2 shows the sectional illustration of a container mouth with a closure cap with a partially interrupted insertion section.
  • the venting recesses used in this example are slots which divide the insertion zone into individual guide cams 22. These continuous slits release the container very quickly as soon as the sealing section comes out of engagement with the container mouth.
  • the closure cap has a right-handed screw thread, so that the one located in the screw-on direction of rotation 17 is located at the front end of the ventilation recess Part 16 of the recess surface acts as a rake surface when screwed on and forms a cutting edge with the outer surface of the inner seal.
  • the insertion cams 22 cannot be referred to as cutting edges in the actual sense due to the clearance angle of 0 °, the terms rake face and cutting edge are nevertheless used in the terminology used here.
  • FIG. 3 shows the sealing area of a closure cap according to the invention in section.
  • the inner seal has a local maximum 15 in the area of the insertion section 6.
  • the centering and pretensioning function of the insertion section is taken over by the sliding zone 13 below the maximum diameter mentioned.
  • the sliding zone itself is functionally divided into a centering zone 25, in which the outside diameter is smaller than the diameter 8 of the container mouth, and a clamping zone 26, in which the outside diameter is larger than the diameter 8 of the container mouth.
  • the container mouth to be closed is indicated by a dash-dotted line.
  • the inner seal has a groove-shaped depression, so that the outer diameter decreases to a local minimum 14.
  • the smoothing friction effect of the insertion zone is thus advantageously also extended to the inner surface of the container mouth.
  • the friction acts on the inner edge of the container mouth until the sliding zone 13 has completely penetrated the container mouth.
  • the point with the maximum local diameter is pushed into the container mouth and the frictional action is thus shifted to the inner surface of the container mouth.
  • This also smoothes surface defects on the inside of the mouth through the insertion section.
  • the preload of the inner seal is not increased further in this phase. Only when the sealing section 5 penetrates into the container mouth after further screwing on is the pretensioning of the inner seal again slightly increased, whereupon the main force of the prestressed inner seal rests on the sealing section.
  • the maximum diameter of the insertion section is advantageously chosen so that it is completely relieved as soon as the sealing section penetrates into the container mouth.
  • Figure 4 shows the sectional view of the sealing area of a screwed cap.
  • the closure is in the fully unscrewed position and the inner seal only touches the inside surface 23 of the container in the area of the sealing section 5.
  • FIG. 5 shows a cross section through the plane A-A according to FIG. 6. This is an inner seal, the outer diameter of which has a local maximum in the area of the insertion section 6.
  • FIG. 6 shows a section of the side view of an inner seal, the outer diameter of which, as can be seen from FIG. 5, has a local maximum in the region of the insertion part.
  • the inner seal has a large number of ventilation openings 9 lying directly next to one another over the entire circumference in the insertion part.
  • two ventilation cutouts 9 lying next to each other only touch at one point, namely where the outer diameter of the insertion section is largest. This point is at the same time the most important for the friction effect, since, as explained in FIG. 3, this point also causes a friction effect on the inside of the mouth.
  • the recesses that directly adjoin one another give the insertion section a profile that has the character of a cutting tool; a positive clearance angle is created.
  • FIG. 7 shows the inner seal shown in FIG. 6 as seen from below (direction B according to FIG. 6). From this illustration, the cutting-shaped embossing through the ventilation cutouts can be seen.
  • the rake surface 16 forms an angle of approximately 90 ° with the envelope surface of the inner seal, which corresponds to a rake angle of 0 °.
  • a preferred range of +/- 10 ° for the choice of the rake angle ⁇ is drawn with dashed lines.
  • the free surface 21 adjoins the same envelope surface at a rather flat angle.
  • both the free surface 21 and the rake surface 16 were formed as a plane parallel to the axis of the closure cap.
  • Further embodiments of the ventilation cutouts to optimize the desired friction effect are possible. These are at the discretion of the specialist.
  • the cutouts can also be designed in such a way that they abut one another not only at one point but along a cutting edge.

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

Abstract

The invention relates to a screw-closure cap made of plastic material, which has a neck-like inner seal (4) for sealing off the container to be closed. The inner seal consists of a narrow seal part (5) and an insertion part (6) which adjoins the latter below it and which is provided for centring and for the careful introduction of the inner seal. In order to achieve the fact that the container is vented as early as possible when unscrewing the closure cap, venting cutouts (9) are provided on the insertion zone (6) of the inner seal. These prevent the sealing-off of the container by the insertion part and allow gas to flow out of the container as soon as the sealing part becomes disengaged from the container mouth. The side faces of the venting cutout serve at the same time as friction faces in order to smooth any unevenness in the container mouth before the actual sealing part comes into engagement. <IMAGE>

Description

Die Erfindung betrifft eine schraubbare Verschlusskappe aus Kunststoffmaterial gemäss Oberbegriff von Anspruch 1. Der Begriff "schraubbar" ist hier so zu verstehen, dass sowohl Verschlusskappen mit Schraubgewinde als auch Bajonettverschlüsse erfasst sind. Derartige Verschlusskappen sind bereits seit langer Zeit bekannt und gebräuchlich und werden vor allem zum Verschliessen von Flaschen für kohlensäurehaltige Erfrischungsgetränke eingesetzt. Bei den Flaschen handelt es sich häufig um Mehrwegflaschen aus Glas oder PET. Da die Behältermündung insbesondere bei Mehrwegflaschen häufig beschädigt ist, werden zum Abdichten der Behälter bevorzugt in die Behältermündung hineinragende Innendichtungen verwendet. Dadurch wird die primäre Dichtpartie etwas ins Innere der Flaschenmündung versetzt. Auch bei beschädigtem Mündungsbereich wird so optimale Dichtwirkung erreicht. Die EP-118 267 zeigt eine derartige Verschlusskappe.The invention relates to a screwable closure cap made of plastic material according to the preamble of claim 1. The term "screwable" is to be understood here such that both closure caps with a screw thread and bayonet closures are included. Such caps have been known and used for a long time and are mainly used for closing bottles for carbonated soft drinks. The bottles are often returnable bottles made of glass or PET. Since the container mouth is often damaged, particularly in the case of reusable bottles, inner seals protruding into the container mouth are preferably used to seal the containers. As a result, the primary sealing section is moved somewhat into the interior of the bottle mouth. In this way, an optimal sealing effect is achieved even when the mouth area is damaged. EP-118 267 shows such a closure cap.

Bei kohlensäurehaltigen Erfrischungsgetränken herrscht bei geschlossenem Behälter ein erhöhter Innendruck. Ein Problem bei derartigen Verschlusskappen besteht darin, dass der Innendruck erst abgebaut wird, wenn die Innendichtung vollständig aus der Behältermündung herausgelöst wird. Innendichtungen der genannten Art haben eine umlaufende Dichtpartie, deren Aussendurchmesser etwas grösser als der Innendurchmesser der Flaschenmündung ist. So ist sichergestellt, dass die Dichtpartie bei aufgesetzter Verschlusskappe gegen die Innenwand der Flaschenmündung gepresst wird. Unterhalb der Dichtpartie folgt eine Einführpartie, deren Aussendurchmesser nach unten etwa konisch abnimmt, so dass er am unteren Ende der Innendichtung kleiner als der Durchmesser der Behältermündung ist. Diese ist notwendig, um das beschädigungslose Einführen der Innendichtung beim Aufschrauben der Schraubkappe sicherzustellen. Diese Konfiguration der Innendichtung führt dazu, dass der obere Bereich der Einführpartie den Behälter dicht abschliessen kann, wenn sich die eigentliche Dichtpartie der Innendichtung bereits ausserhalb der Behältermündung befindet. Dies führt zu einem unnötig späten Druckabbau beim Abschrauben der Verschlusskappe. An sich könnte man diesem Nachteil durch Verkürzung der Einführpartie begegnen. Eine gewisse Länge derselben ist jedoch notwendig, um die Innendichtung zuverlässig und schonend einzuführen.In the case of carbonated soft drinks, there is an increased internal pressure when the container is closed. One problem with such caps is that the internal pressure is only released when the inner seal is completely removed from the container mouth. Inner seals of the type mentioned have a circumferential sealing section, the outer diameter of which is somewhat larger than the inner diameter of the bottle mouth. This ensures that the sealing section is pressed against the inner wall of the bottle mouth when the cap is on. An insertion section follows below the sealing section, the outer diameter of which decreases approximately conically downwards, so that it is smaller at the lower end of the inner seal than the diameter of the container mouth. This is necessary to avoid damage Ensure that the inner seal is inserted when the screw cap is screwed on. This configuration of the inner seal means that the upper area of the insertion section can seal the container tightly when the actual sealing section of the inner seal is already outside the container mouth. This leads to an unnecessarily late pressure release when the cap is unscrewed. As such, this disadvantage could be countered by shortening the insertion section. However, a certain length of the same is necessary in order to insert the inner seal reliably and gently.

Die bekannten Innendichtungen haben im weiteren den Nachteil, dass die Aussenfläche der Einführpartie, welche mit der Behältermündung als erste in Kontakt kommt, eine glatte Aussenfläche aufweist. Rauhe, unregelmässige oder beschädigte Stellen an der Behältermündung können daher durch die Einführpartie kaum geglättet werden und es besteht die Gefahr, dass die für das Abdichten wesentliche Dichtpartie verletzt wird.The known inner seals also have the disadvantage that the outer surface of the insertion section, which comes into contact with the container mouth first, has a smooth outer surface. Rough, irregular or damaged areas at the mouth of the container can therefore hardly be smoothed out by the insertion section and there is a risk that the sealing section essential for sealing is damaged.

Es ist daher Aufgabe der Erfindung, die Nachteile des Bekannten zu vermeiden und insbesondere eine Verschlusskappe der eingangs genannten Art zu schaffen, bei welcher der Innendruck beim Abschrauben zuverlässig abgebaut wird, sobald sich die Dichtpartie der Innendichtung ausserhalb der Behältermündung befindet. Dabei soll das Einführen der Innendichtung in die Behältermündung auf keine Weise beeinträchtigt werden. Eine weitere Aufgabe der Erfindung besteht darin, die Einführpartie so zu gestalten, dass sie Unebenheiten der Behältermündung beim Aufschrauben egalisiert, so dass die Dichtpartie beim Aufschrauben nicht beschädigt wird.It is therefore an object of the invention to avoid the disadvantages of the known and in particular to create a closure cap of the type mentioned, in which the internal pressure is reliably reduced when unscrewing, as soon as the sealing part of the inner seal is outside the container mouth. The insertion of the inner seal into the container mouth should not be affected in any way. A further object of the invention is to design the insertion part in such a way that it compensates for unevenness in the container mouth when it is screwed on, so that the sealing part is not damaged when it is screwed on.

Diese Aufgabe wird erfindungsgemäss durch eine Verschlusskappe mit den Merkmalen von Patentanspruch 1 gelöst. Die Innendichtung weist eine Dichtpartie und unterhalb der Dichtpartie eine Einführpartie auf. Die Dichtpartie ist jener Teil der Innendichtung, der bei aufgesetzter Verschlusskappe die Behältermündung an ihrer Innenseite berührt und eine Abdichtung bildet. Die Einführpartie dient primär dem zuverlässigen und schonenden Einführen der Innendichtung in die Behältermündung. Diese lässt sich aufgrund ihrer Funktionen weiter unterteilen. Der vorderste Abschnitt der Einführpartie ist die Zentrierzone, in welcher der Aussendurchmesser kleiner als der Durchmesser der Behältermündung ist. Sie zentriert und führt die Innendichtung beim Aufsetzen der Verschlusskappe. Nach der Zentrierzone folgt eine Spannzone, in welcher der Aussendurchmesser grösser als der Durchmesser der Behälteröffnung ist. Beim Eindringen der Spannzone in die Behälteröffnung wird die Innendichtung zusammengepresst und damit vorgespannt. Im Bereich der Einführpartie weist die Aussenfläche der Innendichtung wenigstens eine Entlüftungsaussparung auf. Die Entlüftungsaussparung bildet eine Verbindung zum Innenraum des Behälters, sobald die Dichtpartie ausser Eingriff mit der Behältermündung kommt. Sie verhindert, dass die Einführpartie mit der Behältermündung eine Abdichtung bilden kann und sorgt somit für die Entlüftung des Behälters zum frühestmöglichen Zeitpunkt. Damit wird sichergestellt, dass das Innengewinde der Verschlusskappe bis zum Einsetzen der Entlüftung sicher mit dem Aussengewinde des Behälterhalses im Eingriff steht. Die Gefahr des plötzlichen Abspringens der Verschlusskappe beim Abschrauben derselben aufgrund von zu hohem Innendruck und zu spätem Lüften des Behälters wird damit verringert.This object is achieved according to the invention by a closure cap with the features of patent claim 1. The inner seal has a sealing section and an insertion section below the sealing section. The sealing section is that part of the Inner seal that touches the inside of the container mouth when the cap is on and forms a seal. The insertion section is used primarily for the reliable and gentle insertion of the inner seal into the container mouth. This can be further divided based on its functions. The foremost section of the insertion section is the centering zone, in which the outside diameter is smaller than the diameter of the container mouth. It centers and guides the inner seal when the cap is put on. After the centering zone there follows a clamping zone in which the outside diameter is larger than the diameter of the container opening. When the clamping zone penetrates the container opening, the inner seal is pressed together and thus pre-tensioned. In the area of the insertion section, the outer surface of the inner seal has at least one ventilation recess. The venting recess forms a connection to the interior of the container as soon as the sealing part comes out of engagement with the container mouth. It prevents the insertion section from forming a seal with the container mouth and thus ensures that the container is vented at the earliest possible time. This ensures that the internal thread of the sealing cap is securely engaged with the external thread of the neck of the container until the vent is inserted. The risk of the cap suddenly jumping off when unscrewing it due to excessive internal pressure and too late ventilation of the container is thus reduced.

Die Entlüftungsaussparung wird vorzugsweise so gestaltet, dass sie sich wenigstens über die gesamte Höhe der Spannzone erstreckt. Damit ist sichergestellt, dass ein offener Luftkanal besteht, sobald sich die Dichtpartie ausser Eingriff mit der Behältermündung befindet.The venting recess is preferably designed so that it extends at least over the entire height of the clamping zone. This ensures that there is an open air duct as soon as the sealing section is out of engagement with the container mouth.

Die Anzahl der Entlüftungsaussparungen sowie deren Breite und Tiefe beeinflussen die Geschwindigkeit der Entlüftung beim Öffnen des Behälters. Zu beachten ist, dass die Einführungszone im Bereich der Entlüftungsaussparung ihre Führungsfunktion nicht erfüllt. Um einer Zerstörung der Dichtpartie im Bereich der Entlüftungsaussparung vorzubeugen, wird mit Vorteil darauf geachtet, dass die Breite der Entlüftungsaussparung 1/15 des Umfangs der Innendichtung nicht übersteigt.The number of ventilation cutouts as well as their width and depth influence the speed of the ventilation Open the container. It should be noted that the entry zone in the area of the ventilation cutout does not fulfill its guiding function. In order to prevent destruction of the sealing area in the area of the ventilation cutout, it is advantageously ensured that the width of the ventilation cutout does not exceed 1/15 of the circumference of the inner seal.

Unter dem Durchmesser der Einführpartie ist, unabhängig von Entlüftungsaussparungen, der Durchmesser der äussersten Fläche zu verstehen. Liegen mehrere Entlüftungsaussparungen direkt nebeneinander, so kann die Aussenfläche auf einzelne Kanten reduziert werden. Daher wird stellenweise auch der Begriff Hüllfläche verwendet, womit die Aussenfläche ohne Entlüftungsaussparungen gemeint ist. Die Innendichtung wird häufig so gestaltet, dass ihr Aussendurchmesser im Bereich der Einführpartie zum unteren Ende hin abnimmt. Der nach unten hin stetig, in der Regel konisch abnehmende Aussendurchmesser führt dazu, dass die Innendichtung während dem Aufschrauben gleichmässig vorgespannt wird, bis die Dichtpartie in die Behältermündung eindringt. Während dieser Vorspannphase liegt die Einführpartie an der Innenkante der Behältermündung an. Die dabei durch das Drehen des Verschlusses auftretende Reibung wirkt egalisierend auf mögliche Unebenheiten im Mündungsbereich. Diese Reibwirkung kann durch geeignete Gestaltung der Entlüftungsaussparung gezielt verstärkt werden.The diameter of the insertion section is to be understood to mean the diameter of the outermost surface, regardless of the ventilation cut-outs. If there are several ventilation cutouts next to each other, the outer surface can be reduced to individual edges. For this reason, the term envelope surface is sometimes used, which means the outer surface without ventilation cutouts. The inner seal is often designed so that its outer diameter in the area of the insertion part decreases towards the lower end. The continuously decreasing, generally conically decreasing outer diameter means that the inner seal is evenly pre-tensioned during screwing on until the sealing section penetrates into the container mouth. During this pretensioning phase, the insertion section lies against the inside edge of the container mouth. The friction that occurs as a result of turning the closure has an equalizing effect on possible unevenness in the mouth area. This friction effect can be specifically increased by suitable design of the ventilation cutout.

Bei einer anderen, ebenfalls vorteilhaften Gestaltung der Einführpartie, hat diese lediglich in ihrem unteren Bereich eine Gleitzone, in welcher der Aussendurchmesser zum unteren Ende hin abnimmt. Zwischen der Gleitzone und der Dichtpartie weist der Aussendurchmesser der Innendichtung einen lokalen Minimalwert auf, so dass am oberen Ende der genannten Gleitzone ein lokal maximaler Aussendurchmesser entsteht, der grösser ist, als der Durchmesser der zu verschliessenden Behältermündung. Dieser wird mit Vorteil möglichst gross gewählt, jedoch so, dass er bei aufgesetzter Verschlusskappe, sobald die Dichtpartie in die Behältermündung eindringt, von der Behälterinnenwand abgehoben wird. Diese Konfiguration hat den Vorteil, dass die Einführpartie beim Aufschrauben der Verschlusskappe an der Mündungs-Innenfläche anliegt, sobald die Gleitpartie in die Behältermündung eingedrungen ist. Damit wird die Reibwirkung der Einführpartie auch im Bereich der Mündungs-Innenfläche wirksam.In another, likewise advantageous design of the insertion section, it only has a sliding zone in its lower area, in which the outside diameter decreases towards the lower end. The outer diameter of the inner seal has a local minimum value between the sliding zone and the sealing section, so that at the upper end of said sliding zone there is a locally maximum outer diameter which is larger than the diameter of the container mouth to be closed. This is advantageously chosen to be as large as possible, however, in such a way that it is lifted off the inside wall of the container when the sealing cap is in place as soon as the sealing part penetrates into the container mouth. This configuration has the advantage that when the cap is screwed on, the insertion part lies against the inside surface of the mouth as soon as the sliding part has entered the container mouth. The frictional effect of the insertion section also becomes effective in the area of the inner surface of the mouth.

Auch die Form der Entlüftungsaussparung selbst beeinflusst nachhaltig die Reibwirkung der Einführpartie. Die Reibwirkung wird vorteilhaft verstärkt wenn zwischen Entlüftungsaussparungen Schneidekanten zum Egalisieren unregelmässiger oder beschädigter Mündungskanten von Kunststoffbehältern vorgesehen sind. Zur Beschreibung der diesbezüglichen Aussparungsgestaltung werden die von der spanabhebenden Bearbeitung zum Definieren der Scheidengeometrie bekannten Begriffe verwendet. Dabei ist die Entlüfungsaussparung mit der Lücke zwischen zwei Sägezähnen zu vergleichen. Obwohl die Verschlusskappe aus relativ weichem Kunststoff besteht, wurden mit einem Spanwinkel von etwa 0° die besten Resultate erreicht. Dabei stellt die Oberfläche der Entlüftungsaussparung, am in Aufschraubdrehrichtung betrachtet vorderen Ende derselben, die Spannfläche dar, welche etwa im rechten Winkel entlang einer Schneidekante an die Hüllfläche der Einführpartie anschliesst. Damit ist die Schneidekante so gerichtet, dass sie beim Drehen der Verschlusskappe in Aufschraubdrehrichtung als Schneide arbeiten kann. Optimale Ergebnisse werden mit Spanwinkeln im Bereich von +/- 10° erreicht. Mit dieser primitiven Kunststoffschneide kann auch bei Kunststoffbehältern kein eigentlicher spanabhebender Vorgang erreicht werden. Das ist auch nicht beabsichtigt, da sonst Kunststoffspäne in das Getränk fallen würden. Tatsächlich handelt es sich um eine Art plastischer Deformierung von Graten und Kerben, was eigentlich einen negativen Spanwinkel nahelegen würde. Aufgrund des weichen Schneidenmaterials wurden aber dennoch mit Spanwinkeln von etwa 0° die besten Resultate erreicht.The shape of the ventilation recess itself also has a lasting effect on the friction effect of the insertion section. The friction effect is advantageously increased if cutting edges are provided between venting recesses for leveling irregular or damaged mouth edges of plastic containers. The terms known from machining to define the sheath geometry are used to describe the relevant recess design. The venting recess is to be compared with the gap between two saw teeth. Although the cap is made of relatively soft plastic, the best results were achieved with a rake angle of around 0 °. The surface of the ventilation cutout, at the front end of the latter when viewed in the screwing-on direction of rotation, represents the clamping surface, which adjoins the envelope surface of the insertion part at approximately a right angle along a cutting edge. The cutting edge is thus aligned so that it can work as a cutting edge when the cap is turned in the screw-on direction. Optimal results are achieved with rake angles in the range of +/- 10 °. With this primitive plastic cutting edge, no actual machining process can be achieved even with plastic containers. This is also not intended, otherwise plastic chips would fall into the drink. In fact, it is a kind of plastic deformation of ridges and notches, which would actually suggest a negative rake angle. However, due to the soft cutting material nevertheless achieved the best results with rake angles of approximately 0 °.

Da die Einführpartie während des Aufschraubens der Verschlusskappe lediglich während des Bruchteils einer Umdrehung im Eingriff steht, reicht eine Entlüftungsaussparung nicht aus, um den gesamten Mündungsumfang im oben beschriebenen Sinne zu bearbeiten. Die Verschlusskappe lässt sich daher weiter verbessern, indem mehrere Entlüftungsaussparungen gleichmässig über den Umfang der Innendichtung verteilt angeordnet werden. Besonders gute Reibeigenschaften werden erreicht, wenn die Entlüftungsaussparungen in gleichen Abständen voneinander angeordnet werden, insbesondere wenn eine Vielzahl von Entlüftungsaussparungen unmittelbar nebeneinander angeordnet werden. Damit verringert sich die Aussenfläche der Innendichtung in jenem Bereich, wo sich die Entlüftungsaussparungen berühren, auf einzelne Kanten. Beim Aufschrauben der Verschlusskappe ist die Auflagefläche in der Einführungszone folglich auf einzelne Kanten beschränkt, was eine hohe Flächenpressung zur Folge hat. Dies wirkt sich positiv auf den Reib- und Glättungseffekt aus.Since the insertion part is only engaged for a fraction of a turn during the screwing on of the closure cap, a venting recess is not sufficient to process the entire mouth circumference in the sense described above. The sealing cap can therefore be further improved by arranging several ventilation cutouts evenly distributed over the circumference of the inner seal. Particularly good friction properties are achieved if the ventilation cutouts are arranged at equal distances from one another, in particular if a large number of ventilation cutouts are arranged directly next to one another. This reduces the outer surface of the inner seal to individual edges in the area where the ventilation cutouts touch. When the cap is screwed on, the contact surface in the insertion zone is consequently limited to individual edges, which results in high surface pressure. This has a positive effect on the friction and smoothing effect.

Bei direkt nebeneinanderliegenden Entlüftungsaussparungen werden bei Verwendung der bereits erwähnten Schneidengeometrie mit einem Spanwinkel um 0° die besten Resultate erreicht. Um dennoch die ausreichende Stabilität der einzelnen "Sägezähne" zu gewährleisten, wird die Oberfläche der Entlüftungsaussparung auf der gegenüberliegenden Seite, am in Aufschraubdrehrichtung betrachtet hinteren Ende der Entlüftungsaussparung, so gestaltet, dass sie als Freifläche in einem flachen Winkel an die Hüllfläche der Innendichtung anschliesst. Gute Ergebnisse wurden mit Freiwinkeln unter 30° erreicht.In the case of ventilation cutouts located directly next to each other, the best results are achieved when using the cutting edge geometry already mentioned with a rake angle of 0 °. In order to nevertheless ensure the sufficient stability of the individual "saw teeth", the surface of the ventilation recess on the opposite side, at the rear end of the ventilation recess when viewed in the direction of screwing, is designed in such a way that it adjoins the envelope surface of the inner seal at a flat angle. Good results were achieved with clearance angles below 30 °.

Als Alternative zur sägezahnförmigen Gestaltung können auch symmetrische Entlüftungsaussparungen verwendet werden. Daraus ergibt sich eine Schneidengeometrie mit negativem Spanwinkel und positivem Freiwinkel, wobei beide den gleichen Wert aufweisen. Damit werden beim Auf- und Abschrauben ähnliche Reibeigenschaften erreicht. Gute Resultate werden mit Span- und Freiwinkeln von unter 60° erreicht.As an alternative to the sawtooth design, symmetrical ventilation cutouts can also be used. Out of it this results in a cutting edge geometry with a negative rake angle and a positive clearance angle, both of which have the same value. Similar friction properties are achieved when screwing on and off. Good results are achieved with rake and clearance angles of less than 60 °.

Eine hohe Reibwirkung ohne Einschränkung der Zentrier- und Führungsfunktion der Einführpartie wurden mit Innendichtungen erreicht, die wenigstens 25 und höchstens 50 über den Umfang verteilte, Entlüftungsaussparungen aufweisen.A high friction effect without restricting the centering and guiding function of the insertion section was achieved with internal seals which have at least 25 and at most 50 ventilation openings distributed over the circumference.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen näher erläutert. Es zeigen:

Figur 1
Die Schnittdarstellung einer Behältermündung mit einer Verschlusskappe, welche bis zum Einsetzen der Lüftung abgeschraubt wurde,
Figur 2
die Schnittdarstellung einer Behältermündung mit einer Verschlusskappe mit stellenweise unterbrochener Einführpartie,
Figur 3
die Schnittdarstellung des Dichtungsbereichs einer Verschlusskappe,
Figur 4
die Schnittdarstellung der Dichtpartie einer aufgeschraubten Verschlusskappe,
Figur 5
einen Querschnitt durch die Ebene A-A gemäss Fig. 6,
Figur 6
einen Ausschnitt der Seitenansicht einer Innendichtung mit einer Vielzahl von nebeneinander sägezahnartig angeordneten Entlüftungsaussparungen, und
Figur 7
einen Ausschnitt der in Figur 6 dargestellten Innendichtung von unten her gesehen (Richtung B gemäss Fig. 6).
The invention is explained in more detail below on the basis of exemplary embodiments. Show it:
Figure 1
The sectional view of a container mouth with a closure cap, which was unscrewed until the ventilation was inserted,
Figure 2
the sectional view of a container mouth with a closure cap with interrupted insertion part,
Figure 3
the sectional view of the sealing area of a closure cap,
Figure 4
the sectional view of the sealing part of a screwed cap,
Figure 5
6 shows a cross section through the plane AA according to FIG. 6,
Figure 6
a detail of the side view of an inner seal with a plurality of ventilation cutouts arranged next to one another in a sawtooth fashion, and
Figure 7
a section of the inner seal shown in Figure 6 seen from below (direction B according Fig. 6).

Figur 1 zeigt die Schnittdarstellung einer Behältermündung mit einer Verschlusskappe, welche bis zum Einsetzen der Lüftung abgeschraubt wurde. Die Verschlusskappe besteht aus einer zylindrischen Kappenwand 1 und einem diese abschliessenden Kappenboden 2. Von der Innenfläche 3 des Kappenbodens erstreckt sich eine Innendichtung 4 koaxial mit der Kappenwand 1 zur Kappenöffnung hin. Ist die Verschlusskappe vollständig auf den Behälterhals aufgeschraubt, so berührt die Aussenfläche der Innendichtung die Innenfläche 23 der Behältermündung in einem beschränkten Bereich. Dieser Bereich wird als Dichtpartie 5 bezeichnet. Ihr Aussendurchmesser ist grösser als der Durchmesser 8 der Behältermündung. Unterhalb der Dichtpartie folgt die Einführpartie 6, in der der Aussendurchmesser nach unten hin konisch abnimmt. Beim Aufschrauben der Verschlusskappe kommt die Aussenfläche der Einführpartie 6 als erstes mit der Behältermündung in Kontakt; die Dichtpartie 5 erreicht die Behältermündung erst später. Der nach unten hin abnehmende Durchmesser der Einführpartie liegt an der Innenkante 24 der Behältermündung an. Er zentriert die Innendichtung auf die Behältermündung und sorgt dafür, dass diese schonend vorgespannt wird, bevor die Dichtpartie 5 die Behältermündung erreicht. Beim Abschrauben der Verschlusskappe findet der umgekehrte Vorgang statt. Zunächst wird die Dichtpartie aus der Behältermündung gezogen, die Innendichtung bleibt jedoch zunächst vorgespannt, weil die Einführpartie noch an der Behältermündung anliegt. Erst beim weiteren Abschrauben, wenn die Einführpartie aus der Behältermündung gezogen wird, kann sich die Innendichtung wieder aufweiten. Die Einführpartie bleibt beim Abschrauben solange in Kontakt mit der Behältermündung, bis sich die Innendichtung auf ihre entspannte Normalposition aufgeweitet hat. Die Einführpartie wird somit in zwei Bereiche unterteilt: der untere Bereich der Einführpartie dient dem Zentrieren der Innendichtung auf die Behältermündung, und die Spannzone beginnt dort, wo der Aussendurchmesser der Einführpartie den Durchmesser 8 der Behälteröffnung erreicht.Figure 1 shows the sectional view of a container mouth with a closure cap, which was unscrewed until ventilation began. The closure cap consists of a cylindrical cap wall 1 and a cap base 2 that closes it off. An inner seal 4 extends from the inner surface 3 of the cap base coaxially with the cap wall 1 toward the cap opening. If the closure cap is completely screwed onto the container neck, the outer surface of the inner seal touches the inner surface 23 of the container mouth in a limited area. This area is referred to as the sealing section 5. Their outer diameter is larger than the diameter 8 of the container mouth. Below the sealing section follows the insertion section 6, in which the outside diameter decreases conically towards the bottom. When the closure cap is screwed on, the outer surface of the insertion part 6 comes into contact with the container mouth first; the sealing section 5 reaches the container mouth only later. The downward decreasing diameter of the insertion section lies against the inner edge 24 of the container mouth. It centers the inner seal on the container mouth and ensures that it is gently pretensioned before the sealing section 5 reaches the container mouth. The reverse process takes place when the cap is unscrewed. First, the sealing section is pulled out of the mouth of the container, but the inner seal remains preloaded because the insertion section is still against the opening of the container. The inner seal can only widen again when it is unscrewed again, when the insertion section is pulled out of the container mouth. When unscrewing, the insertion section remains in contact with the container mouth until the inner seal has expanded to its relaxed normal position. The insertion section is thus divided into two areas: the lower area of the insertion section serves to center the inner seal on the container mouth, and the clamping zone begins there, where the outer diameter of the insertion section reaches the diameter 8 of the container opening.

Im Bereich der Einführpartie weist die Innendichtung mehrere Entlüftungsaussparungen auf. Diese verhindern, dass die Innendichtung beim Abschrauben der Verschlusskappe im Bereich der Spannzone eine Abdichtung bilden kann. Um das Lüften des Behälters zum frühestmöglichen Zeitpunkt zu gewährleisten, beginnen die Entlüftungsaussparungen 9 direkt unterhalb der Dichtpartie. Bei der hier dargestellten Verschlusskappe befindet sich die Dichtpartie gerade ausserhalb der Behältermündung. Gas aus dem Behälter kann durch die Entlüftungsaussparungen 9 in Pfeilrichtung y abströmen.In the area of the insertion section, the inner seal has several ventilation openings. These prevent the inner seal from forming a seal when the cap is unscrewed in the area of the clamping zone. In order to ensure that the container is ventilated at the earliest possible point in time, the venting recesses 9 begin directly below the sealing section. In the closure cap shown here, the sealing section is located just outside the container mouth. Gas from the container can flow out through the venting recesses 9 in the direction of the arrow y.

Um das gleichmässige Vorspannen der Innendichtung durch die Einführpartie zu gewährleisten, ist darauf zu achten, dass die Breite 11 der Entlüftungsaussparungen nicht zu gross gewählt wird. Ist die Gleitfläche der Einführzone durch sehr breite Entlüftungsaussparungen unterbrochen, so besteht die Gefahr, dass die Innendichtung im Bereich dieser Aussparungen beim Aufschrauben lokal nach aussen gedrückt wird. Dies kann zur Verletzung der Dichtpartie beim Montieren der Verschlusskappen führen. Gute Resultate wurden mit Entlüftungsaussparungen erreicht, deren Breite 1/15 des Dichtungsumfangs nicht übersteigt.In order to ensure that the inner seal is pre-tensioned evenly through the insertion section, care must be taken that the width 11 of the ventilation recesses is not too large. If the sliding surface of the insertion zone is interrupted by very wide ventilation cutouts, there is a risk that the inner seal in the area of these cutouts will be pressed outwards when screwing on. This can lead to the sealing section being damaged when the sealing caps are fitted. Good results have been achieved with ventilation cutouts, the width of which does not exceed 1/15 of the circumference of the seal.

Figur 2 zeigt die Schnittdarstellung einer Behältermündung mit einer Verschlusskappe mit stellenweise unterbrochener Einführpartie. Die in diesem Beispiel verwendeten Entlüftungsaussparungen sind Schlitze, welche die Einführungszone in einzelne Führungsnocken 22 unterteilen. Diese durchgehenden Schlitze bewirken sehr schnelles Lüften des Behälters, sobald die Dichtpartie ausser Eingriff mit der Behältermündung kommt. Die Verschlusskappe hat ein rechtsgängiges Schraubgewinde, so dass der in Aufschraubdrehrichtung 17 betrachtet am vorderen Ende der Entlüftungsaussparung befindliche Teil 16 der Aussparungsoberfläche beim Aufschrauben als Spanfläche wirkt und mit der Aussenfläche der Innendichtung eine Schneidekante bildet. Obwohl bei den Einführnocken 22 aufgrund des Freiwinkels von 0° nicht von Schneiden im eigentlichen Sinn zu sprechen ist, werden in der hier verwendeten Terminologie dennoch die Begriffe Spanfläche und Schneidekante verwendet.FIG. 2 shows the sectional illustration of a container mouth with a closure cap with a partially interrupted insertion section. The venting recesses used in this example are slots which divide the insertion zone into individual guide cams 22. These continuous slits release the container very quickly as soon as the sealing section comes out of engagement with the container mouth. The closure cap has a right-handed screw thread, so that the one located in the screw-on direction of rotation 17 is located at the front end of the ventilation recess Part 16 of the recess surface acts as a rake surface when screwed on and forms a cutting edge with the outer surface of the inner seal. Although the insertion cams 22 cannot be referred to as cutting edges in the actual sense due to the clearance angle of 0 °, the terms rake face and cutting edge are nevertheless used in the terminology used here.

In Figur 3 ist der Dichtungsbereich einer erfindungsgemässen Verschlusskappe im Schnitt dargestellt. Die Innendichtung weist im Bereich der Einführpartie 6 ein lokales Maximum 15 auf. Die Zentrier- und Vorspannfunktion der Einführpartie wird von der unterhalb des genannten Maximaldurchmessers liegenden Gleitzone 13 übernommen. Die Gleitzone selbst ist funktional aufgeteilt in eine Zentrierzone 25, in welcher der Aussendurchmesser kleiner ist, als der Durchmesser 8 der Behältermündung, und eine Spannzone 26, in welcher der Aussendurchmesser grösser ist, als der Durchmesser 8 der Behältermündung. Die zu verschliessende Behältermündung ist durch eine strichpunktierte Linie angedeutet. Zwischen dem lokalen Maximum 15 und der Dichtpartie 5 weist die Innendichtung eine rillenförmige Vertiefung auf, so dass der Aussendurchmesser auf ein lokales Minimum 14 abnimmt. Damit wird die glättende Reibwirkung der Einführzone in vorteilhafter Weise auch auf die Innenfläche der Behältermündung ausgedehnt. Die Reibung wirkt an der Innenkante der Behältermündung, bis die Gleitzone 13 ganz in die Behältermündung eingedrungen ist. Beim weiteren Zudrehen der Verschlusskappe wird jene Stelle mit lokal maximalem Durchmesser in die Behältermündung hineingeschoben und die Reibwirkung damit auf die Innenfläche der Behältermündung verlagert. Dadurch werden auch Oberflächenfehler an der Mündungsinnenseite durch die Einführpartie geglättet. Die Vorspannung der Innendichtung wird in dieser Phase nicht weiter erhöht. Erst wenn nach weiterem Aufschrauben die Dichtpartie 5 in die Behältermündung eindringt, wird die Vorspannung der Innendichtung nochmals leicht verstärkt, worauf die Hauptkraft der vorgespannten Innendichtung auf der Dichtpartie lastet. Der maximale Durchmesser der Einführpartie wird mit Vorteil so gewählt, dass diese vollständig entlastet wird, sobald die Dichtpartie in die Behältermündung eindringt.FIG. 3 shows the sealing area of a closure cap according to the invention in section. The inner seal has a local maximum 15 in the area of the insertion section 6. The centering and pretensioning function of the insertion section is taken over by the sliding zone 13 below the maximum diameter mentioned. The sliding zone itself is functionally divided into a centering zone 25, in which the outside diameter is smaller than the diameter 8 of the container mouth, and a clamping zone 26, in which the outside diameter is larger than the diameter 8 of the container mouth. The container mouth to be closed is indicated by a dash-dotted line. Between the local maximum 15 and the sealing section 5, the inner seal has a groove-shaped depression, so that the outer diameter decreases to a local minimum 14. The smoothing friction effect of the insertion zone is thus advantageously also extended to the inner surface of the container mouth. The friction acts on the inner edge of the container mouth until the sliding zone 13 has completely penetrated the container mouth. When the cap is closed further, the point with the maximum local diameter is pushed into the container mouth and the frictional action is thus shifted to the inner surface of the container mouth. This also smoothes surface defects on the inside of the mouth through the insertion section. The preload of the inner seal is not increased further in this phase. Only when the sealing section 5 penetrates into the container mouth after further screwing on is the pretensioning of the inner seal again slightly increased, whereupon the main force of the prestressed inner seal rests on the sealing section. The maximum diameter of the insertion section is advantageously chosen so that it is completely relieved as soon as the sealing section penetrates into the container mouth.

Figur 4 zeigt die Schnittdarstellung des Dichtungsbereichs einer aufgeschraubten Verschlusskappe. Der Verschluss befindet sich in vollständig aufgeschrauber Position und die Innendichtung berührt die Mündungsinnenfläche 23 des Behälters lediglich im Bereich von Dichtpartie 5.Figure 4 shows the sectional view of the sealing area of a screwed cap. The closure is in the fully unscrewed position and the inner seal only touches the inside surface 23 of the container in the area of the sealing section 5.

Figur 5 zeigt einen Querschnitt durch die Ebene A-A gemäss Figur 6. Dabei handelt es sich um eine Innendichtung, deren Aussendurchmesser im Bereich der Einführpartie 6 ein lokales Maximum aufweist.FIG. 5 shows a cross section through the plane A-A according to FIG. 6. This is an inner seal, the outer diameter of which has a local maximum in the area of the insertion section 6.

Figur 6 zeigt einen Auschnitt der Seitenansicht einer Innendichtung, deren Aussendurchmesser, wie aus Figur 5 ersichtlich ist, im Bereich der Einführpartie ein lokales Maximum aufweist. Diese Querschnittskonfiguration der Innendichtung wurde bereits im Zusammenhang mit den Figuren 3 und 4 erläutert. Die Innendichtung weist in der Einführpartie am gesamten Umfang eine Vielzahl von direkt nebeneinanderliegenden Entlüftungsaussparungen 9 auf. In diesem Beispiel berühren sich zwei nebeneinanderliegende Entlüftungsaussparungen 9 lediglich in einem Punkt, nämlich dort, wo der Aussendurchmesser der Einführpartie am grössten ist. Dieser Punkt ist gleichzeitig der für den Reibeffekt Wesentlichste, da, wie zu Figur 3 erklärt, durch diese Stelle auch an der Mündungsinnenseite eine Reibwirkung eintritt. Durch die direkt aneinander anschliessenden Aussparungen erhält die Einführpartie eine Profilierung, die den Charakter eines Schneidewerkzeugs aufweist, es entsteht ein positiver Freiwinkel.FIG. 6 shows a section of the side view of an inner seal, the outer diameter of which, as can be seen from FIG. 5, has a local maximum in the region of the insertion part. This cross-sectional configuration of the inner seal has already been explained in connection with FIGS. 3 and 4. The inner seal has a large number of ventilation openings 9 lying directly next to one another over the entire circumference in the insertion part. In this example, two ventilation cutouts 9 lying next to each other only touch at one point, namely where the outer diameter of the insertion section is largest. This point is at the same time the most important for the friction effect, since, as explained in FIG. 3, this point also causes a friction effect on the inside of the mouth. The recesses that directly adjoin one another give the insertion section a profile that has the character of a cutting tool; a positive clearance angle is created.

Figur 7 zeigt die in Figur 6 dargestellte Innendichtung aus der Sicht von unten (Richtung B gemäss Fig. 6). Aus dieser Darstellung ist die schneidenförmige Prägung durch die Entlüftungsaussparungen ersichtlich. An der in Aufschraubdrehrichtung betrachtet vorderen Seite der Entlüftungsaussparung bildet die Spanfläche 16 einen Winkel von etwa 90° mit der Hüllfläche der Innendichtung, was einem Spanwinkel von O° entspricht. In der Figur ist mit gestrichelten Linien ein bevorzugter Bereich von +/- 10° für die Wahl des Spanwinkels α eingezeichnet. Am hinteren Ende der Aussparung schliesst die Freifläche 21 in einem eher flachen Winkel an dieselbe Hüllfläche an. In diesem Beispiel wurden sowohl Freifläche 21 als auch Spanfläche 16 als parallel zur Verschlusskappen-Achse stehende Ebene ausgebildet. Daraus ergibt sich aufgrund des gewählten, aus Figur 5 ersichtlichen Dichtungsquerschnitts, dass sich die einzelnen Aussparungen lediglich in einem Punkt berühren. Weitere Ausführungsformen der Entlüftungsaussparungen zum Optimieren der gewünschten Reibwirkung sind möglich. Diese liegen im Ermessen des Fachmanns. Insbesondere können die Aussparungen auch so gestaltet werden, dass sie nicht nur in einem Punkt, sondern entlang einer Schneidekante aneinanderstossen.FIG. 7 shows the inner seal shown in FIG. 6 as seen from below (direction B according to FIG. 6). From this illustration, the cutting-shaped embossing through the ventilation cutouts can be seen. On the front side of the ventilation cutout, viewed in the screw-on direction of rotation, the rake surface 16 forms an angle of approximately 90 ° with the envelope surface of the inner seal, which corresponds to a rake angle of 0 °. In the figure, a preferred range of +/- 10 ° for the choice of the rake angle α is drawn with dashed lines. At the rear end of the recess, the free surface 21 adjoins the same envelope surface at a rather flat angle. In this example, both the free surface 21 and the rake surface 16 were formed as a plane parallel to the axis of the closure cap. As a result of the selected sealing cross section, which can be seen in FIG. 5, this means that the individual cutouts only touch at one point. Further embodiments of the ventilation cutouts to optimize the desired friction effect are possible. These are at the discretion of the specialist. In particular, the cutouts can also be designed in such a way that they abut one another not only at one point but along a cutting edge.

Claims (12)

Schraubbare Verschlusskappe aus Kunststoffmaterial mit einer zylindrischen Kappenwand (1) und einem diese abschliessenden Kappenboden (2), von dessen Innenfläche (3) sich eie Innendichtung (4) erstreckt, die an ihrer Aussenseite eine umlaufende Dichtpartie (5) zum innenseitigen Abdichten der zu verschliessenden Behälteröffnung aufweist und die unterhalb der Dichtpartie (5) eine Einführpartie (6) aufweist, deren Aussendurchmesser an ihrem unteren Ende (7) kleiner und im Bereich einer Spannzone (26) grösser als der Durchmesser (8) der zu verschliessenden Behälteröffnung ist, dadurch gekennzeichnet, dass die Aussenfläche der Innendichtung im Bereich der Einführpartie (6) wenigstens eine Entlüftungsaussparung (9) aufweist.Screwable sealing cap made of plastic material with a cylindrical cap wall (1) and a cap bottom (2) closing this, from the inner surface (3) of which an inner seal (4) extends, which has a circumferential sealing section (5) on the outside for sealing the seals to be closed Has container opening and below the sealing section (5) has an insertion section (6), the outer diameter of which is smaller at its lower end (7) and larger in the area of a clamping zone (26) than the diameter (8) of the container opening to be closed, characterized that the outer surface of the inner seal in the area of the insertion section (6) has at least one ventilation recess (9). Verschlusskappe gemäss Anspruch 1, dadurch gekennzeichnet, dass sich die Entlüftungsaussparung (9) wenigstens über die gesamte Höhe (26) der Spannzone erstreckt.Closure cap according to claim 1, characterized in that the ventilation recess (9) extends at least over the entire height (26) of the clamping zone. Verschlusskappe gemäss Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Aussendurchmesser der Innendichtung im Bereich der Einführpartie (6) zum unteren Ende (7) hin abnimmt.Closure cap according to claim 1 or 2, characterized in that the outer diameter of the inner seal in the region of the insertion section (6) decreases towards the lower end (7). Verschlusskappe gemäss Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einführpartie (6) in ihrem unteren Bereich eine Gleitzone (13) aufweist, in welcher der Aussendurchmesser zum unteren Ende hin abnimmt und dass der Aussendurchmesser zwischen der Gleitzone und der Dichtpartie einen lokalen Minimalwert (14) aufweist, sodass am oberen Ende der genannten Gleitzone ein lokal maximaler Aussendurchmesser (15) entsteht, der grösser ist als der Durchmesser (8) der zu verschliessenden Behälteröffnung.Cap according to claim 1 or 2, characterized in that the insertion section (6) has in its lower region a sliding zone (13) in which the outside diameter decreases towards the lower end and that the outside diameter between the sliding zone and the sealing section has a local minimum value ( 14), so that at the upper end of said sliding zone there is a locally maximum outer diameter (15) which is larger than the diameter (8) of the container opening to be closed. Verschlusskappe gemäss einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass sich die Breite (11) der Entlüftungsaussparung 1/15 des Umfangs der Innendichtung nicht übersteigt.Closure cap according to one of claims 1 to 4, characterized in that the width (11) of the ventilation recess does not exceed 1/15 of the circumference of the inner seal. Verschlusskappe gemäss einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass an dem in Aufschraubdrehrichtung (17) betrachtet vorderen Ende der Entlüftungsaussparung (11) die Oberfläche (12) derselben als Spanfläche (16) etwa im rechten Winkel entlang einer Schneidekante (18) an die Hüllfläche der Einführpartie anschliesst.Closure cap according to one of claims 1 to 5, characterized in that at the front end of the ventilation recess (11), viewed in the screw-on direction of rotation (17), the surface (12) thereof as a rake face (16) approximately at a right angle along a cutting edge (18) connects the envelope of the insertion section. Verschlusskappe gemäss einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass mehrere Entlüftungsaussparungen (9) über den Umfang der Innendichtung verteilt angeordnet sind.Closure cap according to one of claims 1 to 6, characterized in that a plurality of ventilation cutouts (9) are arranged distributed over the circumference of the inner seal. Verschlusskappe gemäss Anspruch 7, dadurch gekennzeichnet, dass zwischen Entlüftungsaussparungen Schneidkanten zum Egalisieren unregelmässiger oder beschädigter Mündungskanten von Kunststoffbehältern vorgesehen sind.Closure cap according to claim 7, characterized in that cutting edges are provided between ventilation cutouts for leveling out irregular or damaged mouth edges of plastic containers. Verschlusskappe gemäss einem der Ansprüche 7 oder 8, dadurch gekennzeichnet, dass die Entlüftungsaussparungen in gleichen Abständen voneinander angeordnet sind.Closure cap according to one of claims 7 or 8, characterized in that the ventilation recesses are arranged at equal distances from one another. Verschlusskappe gemäss Anspruch 9, dadurch gekennzeichnet, dass die Entlüftungsaussparungen (9) unmittelbar nebeneinanderliegen.Closure cap according to claim 9, characterized in that the ventilation recesses (9) lie directly next to one another. Verschlusskappe gemäss Anspruch 10, dadurch gekennzeichnet, dass am in Aufschraubdrehrichtung (17) betrachtet hinteren Ende (19) der Entlüftungsaussparung (9) die Oberfläche der Entlüftungsaussparung als Freifläche (21) in einem flachen Winkel an die Hüllfläche der Einführpartie anschliesst.Closure cap according to claim 10, characterized in that at the rear end (19) of the ventilation recess (9) when viewed in the screw-on direction (17), the surface of the ventilation recess as a free surface (21) at a flat angle to the envelope surface of the insertion part connects. Verschlusskappe gemäss einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Innendichtung wenigstens 25 und höchstens 50 Entlüftungsaussparungen (9) aufweist.Closure cap according to one of claims 1 to 11, characterized in that the inner seal has at least 25 and at most 50 ventilation openings (9).
EP94810648A 1993-12-23 1994-11-14 Plastic closure cap with early venting inner seal Expired - Lifetime EP0661218B1 (en)

Applications Claiming Priority (2)

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CH387393 1993-12-23
CH3873/93 1993-12-23

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EP (1) EP0661218B1 (en)
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GB2383995A (en) * 2002-01-11 2003-07-16 Portola Packaging Ltd Closure with pressure release system
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EP1679267A3 (en) * 2004-12-16 2006-07-19 Japan Crown Cork Co. Ltd. Plastic cap featuring excellent sealing and venting
EP1679267A2 (en) * 2004-12-16 2006-07-12 Japan Crown Cork Co. Ltd. Plastic cap featuring excellent sealing and venting
US7575121B2 (en) 2004-12-16 2009-08-18 Japan Crown Cork Co., Ltd. Plastic cap featuring excellent sealing and venting
WO2014058555A1 (en) * 2012-10-11 2014-04-17 Owens-Brockway Glass Container Inc. Container, closure, and package
US9051074B2 (en) 2012-10-11 2015-06-09 Owens-Brockway Glass Container Inc. Container, closure, and package
US9409681B2 (en) 2012-10-11 2016-08-09 Owens-Brockway Glass Container Inc. Container, closure, and package
EP3170758A1 (en) * 2012-10-11 2017-05-24 Owens-Brockway Glass Container Inc. Container closure
EP3421383A1 (en) * 2012-10-11 2019-01-02 Owens-Brockway Glass Container Inc. Container, closure, and package
EP3421382A1 (en) * 2012-10-11 2019-01-02 Owens-Brockway Glass Container Inc. Container, closure, and package
FR3045578A1 (en) * 2015-12-22 2017-06-23 Guillaume Lanier CONTAINER CAP FOR CONTAINING A GAS DRINK, COMPRISING A SEAL SKIRT PROVIDED WITH AN EXTENSION AUTHORIZING THE PASSAGE OF GASES
WO2017109372A1 (en) * 2015-12-22 2017-06-29 Lanier Guillaume Cap for a container intended to contain a carbonated beverage, comprising a sealing skirt provided with an extension allowing the passage of gas

Also Published As

Publication number Publication date
HU218165B (en) 2000-06-28
KR950017670A (en) 1995-07-20
HU9403710D0 (en) 1995-02-28
IL111841A0 (en) 1995-03-15
ZA9410236B (en) 1995-09-01
CN1113202A (en) 1995-12-13
SA95150463B1 (en) 2006-03-06
PL175697B1 (en) 1999-01-29
PL306442A1 (en) 1995-06-26
NZ270227A (en) 1995-12-21
ES2119132T3 (en) 1998-10-01
JPH07206018A (en) 1995-08-08
CA2137035A1 (en) 1995-06-24
US5803286A (en) 1998-09-08
EP0661218B1 (en) 1998-07-29
KR100381092B1 (en) 2003-10-22
CN1038024C (en) 1998-04-15
MX9500182A (en) 1997-02-28
AU7913394A (en) 1995-06-29
CO4370041A1 (en) 1996-10-07
AU684564B2 (en) 1997-12-18
DE59406560D1 (en) 1998-09-03
CA2137035C (en) 2005-08-16
BR9405175A (en) 1995-08-01
IL111841A (en) 1997-11-20
RU2114035C1 (en) 1998-06-27
HUT70992A (en) 1995-11-28

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