EP0064047B1 - Closure cap for beverage bottles and bottles provided with such a cap - Google Patents

Closure cap for beverage bottles and bottles provided with such a cap Download PDF

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Publication number
EP0064047B1
EP0064047B1 EP82890051A EP82890051A EP0064047B1 EP 0064047 B1 EP0064047 B1 EP 0064047B1 EP 82890051 A EP82890051 A EP 82890051A EP 82890051 A EP82890051 A EP 82890051A EP 0064047 B1 EP0064047 B1 EP 0064047B1
Authority
EP
European Patent Office
Prior art keywords
closure cap
side wall
rip
bottle
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82890051A
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German (de)
French (fr)
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EP0064047A1 (en
Inventor
Helmut Prohaska
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.)
Folienwalzwerk Brueder Teich AG
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Folienwalzwerk Brueder Teich AG
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Publication date
Application filed by Folienwalzwerk Brueder Teich AG filed Critical Folienwalzwerk Brueder Teich AG
Priority to AT82890051T priority Critical patent/ATE18169T1/en
Publication of EP0064047A1 publication Critical patent/EP0064047A1/en
Application granted granted Critical
Publication of EP0064047B1 publication Critical patent/EP0064047B1/en
Expired 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
    • B65D41/40—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts
    • B65D41/44—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts made of metallic foil or like thin flexible material

Definitions

  • the invention relates to a closure cap for beverage bottles which have an edge bead with an annular axial end and an annular groove which lies at the transition point of the edge bead in the bottle neck, and in which the drink in the bottle is subjected to effects after the cap is put on, which cause an increase in the internal pressure in the space above the beverage
  • which closure cap has a base body which fits over the lip of the bottle and can be brought into contact with the annular groove with its side wall, the essentially cylindrical side wall of which merges into a cover wall via its rounded transition zone Transition zone forms a seat inside for a seal, which covers at least an upper portion of the inner surface of the side wall and extends radially inward along the top wall at least to such an extent that the seal rests on the axial end of the bottle when the closure cap is in place, with the lower edge d he 9.ivand runs along a fraction of its circumference with a rag, which forms an integral part of the base body from sheet metal, initially an extension of the side wall and is then
  • Such caps are known as closures for glass bottles, particularly reusable bottles, both for alcoholic beverages, e.g. Beer, as well as for soft drinks.
  • the shape and size of the mouth of such bottles are standardized, e.g. according to DIN 6094.
  • elevated temperatures are necessary for sterilization. For example, temperatures of about 72 ° C are used in the sterilization of beer, and temperatures between about 123 ° C and 133 ° C are used in the sterilization of gas-free cupboards, these temperatures being maintained for a longer period of time.
  • elevated temperatures are also suitable during transport and storage, e.g. by sun exposure, often not avoid.
  • caps have two mutually parallel tear lines that run vertically upward as an extension of the side edges of the tear tab on the side wall of the closure cap and also extend over the top wall of the closure cap. These caps also do not allow automatic pressure reduction, since this requires a certain amount of stretching of the jacket part of the cap in the circumferential direction, which in the described cap construction leads to bursting at the weak points of the cap material formed by the tear lines. In addition, such caps have the disadvantage that often after the opening of the remaining part of the cap at the bottle mouth and must be removed separately.
  • the invention has for its object to improve a closure cap of the type described above so that the pressure reduction takes place reliably, and there is a reliable seal of the bottle cap again after the excessive pressure has been reduced.
  • the invention solves this problem in that, in the case of a closure cap of the construction described at the outset, in the tear tab area in the side wall to stabilize a blow-off effect in the event of overpressure, there is at least one outwardly curved bead running essentially parallel to the axis of the closure cap.
  • This bead forms an irregularity in the form of a fold in the material of the cap wall at its ends, in particular at the upper end, so that a locally limited weak point of the seal is formed there, at which the pressure reduction can be carried out reliably and, if necessary, several times, after which each time the pressure is reduced there is a sealing reclosure of the bottle, which generally does not take place after the overpressure has been completely eliminated, but only when the overpressure has reached an innocuous value has dropped, for example from 10 bar to 5 bar.
  • This pressure reduction takes place without the risk of tearing open the closure cap wall, since the special type of guidance of the tear line prevents the closure cap from tearing along the tear line when the pressure is reduced.
  • closure cap according to the invention can also be easily applied to bottles during the closure process, only relatively low pressures being required to achieve the necessary seal. The risk of bottle breakage in the capping machine is therefore reduced and the closure cap according to the invention can even be used for plastic bottles.
  • the beading can also result in advantages when the bottle cap is opened by the user, since during the opening process the weak point mentioned can cause a partial reduction in the overpressure in the bottle before the remaining overpressure can lift the cap off the bottle.
  • the risk of the cap being thrown off the bottle mouth and the risk of a part of the bottle contents being thrown out under the action of the suddenly decreasing excess pressure in the bottle is therefore reduced.
  • the bead ends below the tear line.
  • the bead and the tear line intersect, the acute crossing angle being more than 45 °. In both cases it is avoided that the tearing process follows the bead instead of the tear line.
  • the tear line extends at least to a point which is offset from the starting point of the tear line by approximately half the circumference of the iron wall.
  • the further tear line section runs at a height which is at or slightly above the height at which the largest outer diameter of the edge bead lies. If neither of the two tear line sections extends to the rounded transition zone and the tear line ends with the further section at a distance below the top wall but in the side wall, the cap remains one-piece even after the tear process, i.e. the tear flap is connected to the remaining rope of the closure cap even after the tear-open process and the cap character is also retained. It is therefore possible to put the cap back on the bottle mouth after removing part of the beverage and thereby achieve a certain limited protection of the remaining bottle contents.
  • the connecting zone 16 forms a seat 13 (Fig. 2a) for an annular elastic seal 18, in particular made of polyethylene, PVC or other thermoplastic material, which retains its elasticity even at cooling temperatures to which drinks are normally exposed and which does not soften at elevated temperatures to which drinks are normally exposed during sterilization.
  • the sealing ring 18 preferably consists of a plastic foam which is let into the seat 13 in liquid form and is cured there by heating.
  • the seal 18 can also be a full sealing disk which completely covers the bottom surface of the top wall 14. However, it is more advantageous if the seal does not extend in the radial direction inward far beyond that area which lies against the mouth of the bottle (FIGS. 6, 7).
  • the side wall 12 of the cap which is pressed inward when it is placed on the bottle, is essentially cylindrical in the manufacture of the cap from a sheet by stamping and deep-drawing.
  • the lower edge 20 can be slightly unwound outwards (FIG. 2a), which makes it easier to put the cap on the bottle mouth during the closure process.
  • a tear tab 22 is formed in one piece with the side wall 12, the free end of which protrudes approximately horizontally from the closure cap 10 after it has been formed (FIG. 2).
  • the length of this tear tab 22 is selected so that it can be comfortably gripped by the user for the purpose of tearing open the closure cap.
  • this tear flap 22 is so long that it extends with the closure cap applied down over that bottle bead which lies immediately below the rim bead of the bottle. In this way, the Tear flaps 22 are easily pulled off the bottle neck during the opening process.
  • the tear sheet 22 has a section 24 which forms a continuation of the side wall 12 downward and thus, as it were, an addition which prevents the tear tab from being deformed inadmissibly when the closure cap is pressed onto the bottle when it is placed on it.
  • the end 25 of the tear tab 22 can be rounded (FIG. 1).
  • the tear tab extends along the circumference of the side wall 12 only over a fraction of the same. Its transition points in the lower edge 20 of the side wall 12 are rounded.
  • a tear line 27 runs approximately around half the circumference of the side wall 12.
  • This tear line 27 has three sections 28, 29, 30, which in the embodiment according to FIGS. 1 and 2 merge continuously into one another.
  • the tear line 27 has its starting point 26 at the rounded transition point between the tear tab 22 and the side wall 12 and its first section 28 rises at an acute angle to the horizontal plane.
  • the second section 29 runs flatter upwards towards the top wall 14 and then horizontally and merges into the third, also horizontally running section 30, which runs somewhat around the top wall 14 about half the circumference of the side wall 12.
  • the angle which the tear line sections 28, 29 form with the horizontal plane should be less than 75 °, preferably less than 45 °, e.g.
  • the tear line section 30 should be arranged so deep, approximately 2.5 mm below the top surface 14, that the majority of the seal 18 is not disturbed. In this way it is assured that the seal 18 remains intact for as long as possible during the opening process.
  • the arrangement should also be such that below the tear line 27 there remains a strip which absorbs the tensile forces when the closure cap is opened, the width of which should be about 2 to 3 mm.
  • the tear line 27 ends approximately 140 to 180 ° opposite the starting point 26 at the same height as the section 30.
  • the length of the tear line 27 should be large enough to be able to easily remove the closure cap from the bottle after passing through the tear line.
  • the tear line 27 is formed in the material of the closure cap 10 during its manufacture, namely that it is incorporated into the sheet metal blank in the flat state thereof before the closure cap 10 is deep-drawn into its final shape. Using a suitable tool, the tear line is formed as a groove, the bottom 34 (FIG. 3) of which is flat. The material in the area 36 under the tear line 27 may be hardened when the tear line 27 is formed, so that the pulling off of the tear tab 22 along the tear line 27 is facilitated without adversely affecting the overall strength and thereby the sealing behavior of the closure cap 10.
  • the groove forming the tear line 27 is open to the inside of the side wall 12.
  • the tear tab 22 has on its inner wall a bead 38 '(FIG. 2) in the form of a U-shaped bulge which forms a rib 38 on the outside of the tear tab 22 which reinforces the tear tab 22.
  • the ends 40, 42 of this rib 38 are substantially higher than the lower edge 20 of the side wall 12, but do not cross the tear line 27 and do not extend into the seal 18.
  • the material of the closure cap has an accumulation of wrinkles, even after the cap has been applied to the bottle, so that when a predetermined internal pressure occurs, the excess pressure, especially in this area, is reliably released, whereupon the cap seals properly again.
  • This blow-off effect can be optimally adjusted by a suitable choice of material in connection with the design and type of the closure cap. Versions tried and tested in practice blow off between 8 and 10 bar, the internal pressure in the bottle being reduced to about 5 bar and then sealed again. These embodiments consisted of a deep-drawn aluminum cap made of an aluminum sheet with a thickness between 180 and 190 microns, since its tensile strength was between 120 and 160 Newson / mm 2 . The aluminum was 99% pure. Under normal transport and storage conditions, the internal pressure in beverage bottles is up to around 6 bar, but shaking and / or heating the bottle can result in an internal pressure of over 10 bar.
  • the closure cap When the closure cap is applied to a beverage bottle of the type described at the outset, the cap is held in a sleeve provided with fingers and placed on the bottle with it. Then will
  • the cap is pressed against the bottle mouth at such a pressure that the material of the seal is compressed elastically. Sodar.n the sleeve is pulled together around the beaded edge of the bottle and presses the lower edge 20 of the side wall 12 of the cap into the annular groove between the beaded edge and the subsequent bottle bulge with the formation of folds. At the same time, the transition zone 16 is pressed against the rounded profile of the bead edge of the bottle, the radius of curvature of the transition zone 16 being increased.
  • the stresses that occur during these processes like the manufacture of the closure cap, result in material hardening caused by cold deformation of the metal, which is essentially uniform over the circumference of the closure cap.
  • the selected material hardening and the associated increase in the elasticity of the fibers favor or in the first place enable the described blow-off effect to occur, because there is a slight expansion of the closure cap and / or an increase thereof with respect to the bottle neck during the blow-off , so that part of the gas can escape from the bottle, with this expansion of the cap the material must remain in the elastic range.
  • the elasticity of the cold-hardened sheet metal of the closure cap then leads it back into the sealing starting position.
  • FIG. 4 is similar to that of FIG. 1 with two exceptions.
  • the first difference is that the end 25 of the tear tab 22 extends in a straight line, but obliquely with respect to the two side edges 48, 50, so that the side edge 48 closer to the starting point 26 of the tear line 27 is longer than the other side edge 50. This causes the user to grasp the tear tab closer to the side edge 48 and pull it to the right so that the tear along the tear line 27 begins in the correct direction, although the tear line 27 is not visible to the user since it is is on the inside wall of the cap.
  • the second difference is that the upper end 42 of the rib 38 extends up to the area of the top wall 14. In this way, a weak point is formed there in the seal 18, since the bead 38 ′ located on the inside of the cap on the rear of the rib 38 in the region of the end 42 forms a channel-like connection from the seal 18 to the tear line 27. Even if the material of the seal 18 should fill this bead 38 ', its upper end (at 42) nevertheless forms the weakest point for the escape of excess pressure from the inside of the bottle when the cap is opened, since the seal 18 is located at this point pressure against the bottle mouth is lowest. The gas from the bottle has therefore already escaped when the tearing process of the tear tab 22 has ended, so that the excess pressure in the bottle is then completely eliminated and the closure cap 10 cannot therefore be thrown off.
  • the other leg of the U-shaped rib 58 (FIG. 4) does not extend so far upwards with its end 40 and does not cross the rising section 28 of the tear line 27.
  • a cross between this end 40 of the rib 38 and the tear line 27 may only essentially exist in the latter horizontal sections 29, 30 occur.
  • the bottle of which only the uppermost section is shown, consists mostly of glass, but possibly also of plastic.
  • the bottle 62 has at its upper end an edge bead 64, the end 66 of which has a somewhat flattened central section, but is otherwise rounded.
  • the outer surface of the bead 64 is drawn inwards and ends in an annular groove 68 on the bottle neck. Below this annular groove 68 there is a bulge 70 for reinforcing the bottle neck.
  • This bottle shape is standardized worldwide, whereby in almost all cases the maximum diameter of the edge bead 64 is approximately 26.5 mm.
  • the inside diameter of the side wall 12 of the closure cap is now chosen such that it fits snugly on the bottle end in the first step of its application.
  • the side wall 12 is pressed in under the bead 64, only a small axial pressure is required.
  • the bottom of the side wall 12 has, despite the wrinkling of the material, practically invisible grooves, so that a label remains clearly legible, even if it was applied to the metal sheet before the closure cap was formed.
  • the tearing process begins at the starting point 26 of the tearing line 27 by pulling the tearing flap 22 to the right (FIG. 9). 5 and 7 it can be seen that the end 40 of one leg of the U-shaped rib 38 extends almost to the tear line 27, the other end 42 even beyond. Correspondingly, the bead 38 'also extends (FIG. 7). As a result of the greater length of the leg of the rib 38 leading to the end 42 compared to the embodiment according to FIG. 1, greater wrinkling occurs in the side wall material of the cap, these folds reaching as far as the seal 18, so that a limited weak point of the seal is formed there.
  • the tear tab 22 has a U-shaped rib 38, which, however, does not extend to the tear line 27 and mainly serves to reinforce and reinforce the tear tab 22.
  • An additional, central rib 38 serves to relieve the pressure prevailing in the bottle. This central rib 38 crosses the tear line 27 approximately in a right-angled manner and extends in the side wall 12 up to the upper part of the rounded transition point 16 and therefore to the seal 18 in
  • the tear tab 22 is shown partially pulled away, the upper portion of the rib 38 being separated from its lower portion. Arrows indicate how the gas escapes via the channel formed by the upper section of the rib 38 and / or in the vicinity thereof, so that the overpressure in the bottle is reduced during the opening process, even though the remaining part of the closure cap 10 is still on the bottle .
  • Fig. 10 shows a development of a part of the sheet metal blank for the closure cap 10 in plan view, before the formation of the closure cap.
  • a bead 38 ' is provided on the inside of a rib as in the embodiments according to FIGS. 8 and 9.
  • the parallel dashed lines 102, 104 represent the section in which the seal 18 will lie.
  • an adhesive e.g. in the form of a lacquer, applied to the surface of the sheet essentially only in the zone 106 lying between the two lines 102, 104, which has an interruption 108 over part of its circumference in the region of the bead 38 '. In this way it is ensured that the seal 18 does not adhere to the bead 38 ', although this bead is filled with the sealing material.
  • the gas can escape between the seal 18 and the axial end 66 of the bottle. It is believed that the elasticity of the side wall 12 allows a slight expansion of its lower edge 20 when the cap is slightly raised along the bead 64. With this lifting of the sealing cap, the gas can flow in under the seal 12 and emerge along the side wall 12 of the sealing cap 10 in the region of the weak point already mentioned which is caused by the fold formation in the material of the side wall.
  • the top wall 14 can also be arched. This bulge can be created right from the start when the cap is manufactured, as can the top wall a profile, e.g. by deep drawing, embossing or the like. The arching of the top wall 14 from its original flat shape can also occur under the influence of the forces acting on the bottle when the cap is applied and / or under the influence of the gas pressure prevailing in the bottle.
  • the tear tab can have a different shape than that shown in the drawing.
  • a single rib section forming a bead on its underside or a series of such rib sections can be provided in the tear tab or above it, in all cases a gradual reduction in pressure can be achieved when the closure cap is opened.
  • the tear line can also be formed by a row of perforations in the material of the side wall or at least have an interruption along its course, as a result of which the speed at which the cap is torn open along the tear line can be locally delayed or even stopped.
  • the tear line can also be formed by at least two lines running parallel to one another.
  • the invention can also be applied to steel caps which are suitably protected by corrosion-inhibiting coatings or coatings, as well as to caps made of other metals.
  • sheet metal made of aluminum or aluminum alloys is mostly preferred, since these materials are lighter than steel and are easier to tear open.
  • the transition zone 16 is to be understood as an extension of the side wall 12, so that the term “side wall” also includes this transition zone.
  • “Drink” means any liquid or pulpy food that is sold or dispensed in bottles.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Laminated Bodies (AREA)

Abstract

A bottle closure cap stampable from sheet metal as a shallow cylindrical inverted dish having a rounded juncture forming a fillet between its crown and its cylindrical wall; a layer of elastomeric material being disposed in the fillet and engageable with the axial end of the bottle when the cap is attached. A generally radially extending rip tab is integral with the cylindrical wall at the bottom edge thereof and is adapted to tear through the cylindrical wall by a generally circumferential pull of the user to gain access to the container. A rip line is provided commencing at a corner defined by the bottom edge of the cylindrical wall where it meets the rip tab. The rip line extends at a shallow angle across the cylindrical wall to a level which is spaced below the crown, continuing parallel to the crown circumferentially about half-way around the closure cap. The installed closure cap can relieve excessive interior pressure and reseal itself, the closure cap pressure in the container being relievable gradually while the rip tab is being pulled to gain access to the container.

Description

Die Erfindung bezieht sich auf eine Verschlußkappe für Gesränkeflaschen, die einen Randwulst mit einem ringförmigen axialen Ende und einer Ringnut aufweisen, die an der Übergangsstelle des Randwulstes in den Flaschenhals liegt, und bei welchen das Getränk in der Flasche nach Aufsetzen der Verschlußkappe Einwirkungen unterworfen ist, die eine Erhöhung des Innendruckes im Raum oberhalb des Getränkes bewirken, welche Verschlußkappe einen über den Wulstrand der Flasche passenden und mit seiner Seitenwand hiebei in Anlage an die Ringnut bringbaren Grundkörper hat, dessen im wesentlichen zylindrische Seitenwand über ihre abgerundete Übergangszone in eine Deckwand übergeht, welche Übergangszone innen einen Sitz für eine Dichtung bildet, die zumindest einen oberen Abschnitt der Innenfläche der Seitenwand abdeckt und sich radial nach innen entlang der Deckwand zumindest so weit erstreckt, daß die Dichtung am axialen Ende der Flasche bei aufgesetzser Verschlußkappe anliegt, wobei vom Unterrand der Seitenivand entlang eines Bruchteiles ihres Umfanges ein Reißlappen ausgeht, der mit dem Grundkörper einstückig aus Blech, bestehs, zunächst eine Verlängerung der Seitenwand bildet und anschließend im wesentlichen normal dazu seitlich abgewinkelt ist, jedoch nach Aufbringen der Verschlußkappe auf die Flasche zum Flaschenhals abbiegbar ist, und eine Reißlinie vorhanden ist, die zumindest zum Großteil in der Seitenwand des Grundkörpers verläuft und zumindest zwei Abschnitte hat, von denen der Anfangsabschnitt in einem Bereich beginnt, der die Übergangsstelle des einen Seitenrandes des Reißlappens in den Unterrand der Seitenwand enthält, und steigend von dort entlang des Umfanges der Seitenwand gegen die abgerundese Ubergangszone derart verläuft, daß der andere Seitenrand des Reißlappens passiert wird, wobei ein weiterer Reißlinienabschnitt in Abstand unterhalb Der Deckwand enslang des Umzfanges der Seitenwand verläuft DE-A-27 23460.The invention relates to a closure cap for beverage bottles which have an edge bead with an annular axial end and an annular groove which lies at the transition point of the edge bead in the bottle neck, and in which the drink in the bottle is subjected to effects after the cap is put on, which cause an increase in the internal pressure in the space above the beverage, which closure cap has a base body which fits over the lip of the bottle and can be brought into contact with the annular groove with its side wall, the essentially cylindrical side wall of which merges into a cover wall via its rounded transition zone Transition zone forms a seat inside for a seal, which covers at least an upper portion of the inner surface of the side wall and extends radially inward along the top wall at least to such an extent that the seal rests on the axial end of the bottle when the closure cap is in place, with the lower edge d he Seitenivand runs along a fraction of its circumference with a rag, which forms an integral part of the base body from sheet metal, initially an extension of the side wall and is then angled to the side in a substantially normal manner, but can be bent to the bottle neck after the cap has been attached to the bottle, and there is a tear line which runs at least for the most part in the side wall of the base body and has at least two sections, of which the starting section begins in a region which contains the transition point of the one side edge of the tear tab into the lower edge of the side wall, and increases from there runs along the circumference of the side wall against the rounded transition zone in such a way that the other side edge of the tear tab is passed, with another tear line section at a distance below the top wall along the perimeter of the side wall DE-A-27 23460.

Derartige Verschlußkappen sind als Verschluß für Glasflaschen, insbesondere Mehrwegflaschen, bekannt, sowohl für alkoholische Getränke, z.B. Bier, als auch für alkoholfreie Getränke. Die Form und Größe der Mündung solcher Flaschen sind genormt, z.B. nach DIN 6094. Es ist auch bekannt, daß sich der Aufbau eines wesentlichen Innendruckes in der verschlossenen Flasche nichs vermeiden läßt, vor allem dann, wenn die verschlossene Flasche erhöhten Temperaturen ausgesetzt ist. Solche erhöhte Temperaturen sind aber zur Sterilisierung notwendig. Beispielsweise kommen bei der Keimfreimachung von Bier Temperaturen von etwa 72°C zur Anwendung, bei der Sterilisierung gasfreier Gesränke im Autoklaven Temperaturen zwischen etwa 123°C und 133°C, wobei diese Temperaturen jeweils für längere Zeit aufrechserhalten werden. Aber auch beim Transport und bei der Lagerung üassen sich erhöhte Temperaturen, z.B. durch Sonnenbestrahlung, oft nicht vermeiden.Such caps are known as closures for glass bottles, particularly reusable bottles, both for alcoholic beverages, e.g. Beer, as well as for soft drinks. The shape and size of the mouth of such bottles are standardized, e.g. according to DIN 6094. It is also known that the build-up of a substantial internal pressure in the closed bottle cannot be avoided, especially when the closed bottle is exposed to elevated temperatures. Such elevated temperatures are necessary for sterilization. For example, temperatures of about 72 ° C are used in the sterilization of beer, and temperatures between about 123 ° C and 133 ° C are used in the sterilization of gas-free cupboards, these temperatures being maintained for a longer period of time. However, elevated temperatures are also suitable during transport and storage, e.g. by sun exposure, often not avoid.

Eine weitere Ursache für den Aufbau eines wesentlichen Innendruckes in der Flasche liegt in ErschöDCtterungen des gashältigen Flascheninhaltes, die zum Austreiben des Gases aus der f IöDCssigkeit führen und dadurch den Druck in der Flasche oberhalb des Flüssigkeitsspiegels erhöhen.Another cause for the build-up of a substantial internal pressure in the bottle is the shock in the gas-containing bottle contents, which lead to the expulsion of the gas from the liquid and thereby increase the pressure in the bottle above the liquid level.

Aus den angeführten Gründen kommt es daher immer wieder zu explosionsartigen Brüchen der Flaschen, insbesondere bei gebrauchten Flaschen infolge von auch bei sorgfältiger Kontrolle schwer zu erkennenden Ermüdungen und Fehlerndes Flaschenmateriales. Solche Flaschenbrüche führen in der Produktion zu unerwünschten Unterbrechungen, im Handel und im Verkauf zu Reklamationen und gegebenenfalls sogar Verletzungen.For the reasons given, there are always explosive breaks in the bottles, particularly in the case of used bottles, as a result of fatigue which is difficult to detect even when carefully checked, and defective bottle material. Such bottle breaks lead to undesired interruptions in production, complaints in trade and sales, and possibly even injuries.

Es besteht daher der Wunsch nach einer Verschlußkappe für Getränkeflaschen, welche einen selbsttätigen Druckabbau bei Auftreten eines Überdruckes in der Flasche zuläßt. Die bisher bekannten Verschlußkappen können aber in dieser Hinsicht nicht befriedigen. Die bekannten KronenkorkverschlDCsse ermöglichen überhaupt keinen derartigen Druckabbau und haben darüber hinaus den Nachteil, daß die Aufbringung der Verschlußkappe unter hohem Druck erfolgen muß und daß zur Öffnung des Verschlusses ein besonderes Werkzeug erforderlich ist. Außerdem ist die Seitenfläche der Verschlußkappe gerillt, was die Anbringung einer Beschriftung an der Seitenfläche unmöglich macht.There is therefore a desire for a closure cap for beverage bottles, which allows an automatic pressure reduction when an overpressure occurs in the bottle. The previously known caps can not satisfy in this regard. The known crown cork closures do not allow such a pressure reduction at all and moreover have the disadvantage that the cap must be applied under high pressure and that a special tool is required to open the closure. In addition, the side surface of the cap is grooved, which makes it impossible to attach a label to the side surface.

Weitere bekannte Verschlußkappen weisen zwei zueinander parallele Reißlinien auf, die als Verlängerung der Seitenränder des Reißlappens an der Seitenwand der Ver-schlußkappe vertikal hochlaufen und sich ouer über die Deckwand der Verschlußkappe erstrecken. Diese Verschluß-kappen ermöglichen ebenfalls keinen selbsttätigen Druckabbau, da hiezu eine gewisse Dehnung des Mantelteiles der Verschlußkappe in Umfangsrichtung erforderlich ist, was bei der beschriebenen Kappenkonstruktion zum Aufplatzen an den von den Reißlinien gebildeten Schwachstellen des Kappenmateriales föDChrt. Außerdem haben solche Kappen den Nachteil, daß häufig nach der Öffnung der Restteil der Verschlußkappe an der Flaschenmündung festhaftet und gesondert entfernt werden muß.Other known caps have two mutually parallel tear lines that run vertically upward as an extension of the side edges of the tear tab on the side wall of the closure cap and also extend over the top wall of the closure cap. These caps also do not allow automatic pressure reduction, since this requires a certain amount of stretching of the jacket part of the cap in the circumferential direction, which in the described cap construction leads to bursting at the weak points of the cap material formed by the tear lines. In addition, such caps have the disadvantage that often after the opening of the remaining part of the cap at the bottle mouth and must be removed separately.

Die Erfindung setzt sich zur Aufgabe, eine Ver-schlußkappe der eingangs beschriebenen Art so zu verbessern, daß der Druckabbau verläßlich stattfindet, wobei es nach dem Abbauen des übermäßigen Überdruckes wieder zu einer verläßlichen Dichtung des Flaschenverschlusses kommt. Die Erfindung löst diese Aufgabe dadurch, daß bei einer Verschlußkappe der eingangs beschriebenen Konstruktion im Reißlappenbereich in der Seitenwand zur Stabilisierung eines Abblaseeffektes bei Überdruck mindestens eine im wesentlichen parallel zur Verschlußkappenachse verlaufende, nach außen gewölbte Sicke vorhanden ist. Diese Sicke bildet an ihren Enden, insbesondere am oberen Ende, eine Ungleichmäßigkeit in Form einer Faltenbildung im Material der Kappenwand, so daß dort eine örtlich begrenzte Schwachstelle der Abdichtung gebildet wird, an welcher der Druckabbau verläßlich und gegebenenfalls auch mehrfach erfolgen kann, wobei es nach jedem Druckabbau wieder zu einem dichtenden Wiederverschluß der Flasche kommt, der im allgemeinen nicht nach völligem Abbau des Überdruckes erfolgt, sondern schon dann, wenn der Überdruck auf einen unschädlichen Wert abgesunken ist, z.B. von 10 bar auf 5 bar. Dieser Druckabbau erfolgt ohne Gefahr eines Aufreißens der Verschlußkappenwand, da die besondere Art der Führung der Reißlinie verhindert, daß beim erwähnten Druckabbau die Verschlußkappe entlang der Reißlinie aufreißt. Vorteilhaft ist auch, daß selbst mehrere Sicken immer noch eine im wesentlichen glatte äußere Mantelwand der Verschluß-kappe zulassen, so daß die Anordnung einer Beschriftung dort möglich ist. Die erfindungsgemäße Verschlußkappe läßt sich auch leicht auf Flaschen beim Verschlußvorgang aufbringen, wobei nur verhältnismäßig geringe Drücke zur Erzielung der nötigen Dichtung erforderlich sind. Die Gefahr eines Flaschenbruches in der Verschließmaschine wird daher herabgesetzt und es ist die erfindungsgemäße Verschlußkappe gegebenenfalls sogar für Kunststoffflaschen anwendbar.The invention has for its object to improve a closure cap of the type described above so that the pressure reduction takes place reliably, and there is a reliable seal of the bottle cap again after the excessive pressure has been reduced. The invention solves this problem in that, in the case of a closure cap of the construction described at the outset, in the tear tab area in the side wall to stabilize a blow-off effect in the event of overpressure, there is at least one outwardly curved bead running essentially parallel to the axis of the closure cap. This bead forms an irregularity in the form of a fold in the material of the cap wall at its ends, in particular at the upper end, so that a locally limited weak point of the seal is formed there, at which the pressure reduction can be carried out reliably and, if necessary, several times, after which each time the pressure is reduced there is a sealing reclosure of the bottle, which generally does not take place after the overpressure has been completely eliminated, but only when the overpressure has reached an innocuous value has dropped, for example from 10 bar to 5 bar. This pressure reduction takes place without the risk of tearing open the closure cap wall, since the special type of guidance of the tear line prevents the closure cap from tearing along the tear line when the pressure is reduced. It is also advantageous that even several beads still allow an essentially smooth outer jacket wall of the closure cap, so that the labeling can be arranged there. The closure cap according to the invention can also be easily applied to bottles during the closure process, only relatively low pressures being required to achieve the necessary seal. The risk of bottle breakage in the capping machine is therefore reduced and the closure cap according to the invention can even be used for plastic bottles.

Die Sicke kann aber auch beim Öffnen des Flaschenverschlusses durch den Benützer Vorteile ergeben, da beim Offnungsvorgang die erwähnte Schwachstelle einen Teilabbau des Überdruckes in der Plasche bewirken kann, bevor der restliche Überdruck die Kappe von der Flasche abheben kann. Die Gefahr eines Abschleuderns der Kappe von der Flaschenmündung und die Gefahr eines Ausschleuderns eines Teiles des Flascheninhaltes unter Einwirkung des sich plötzlich abbauenden Überdruckes in der Flasche wird daher herabgesetzt.However, the beading can also result in advantages when the bottle cap is opened by the user, since during the opening process the weak point mentioned can cause a partial reduction in the overpressure in the bottle before the remaining overpressure can lift the cap off the bottle. The risk of the cap being thrown off the bottle mouth and the risk of a part of the bottle contents being thrown out under the action of the suddenly decreasing excess pressure in the bottle is therefore reduced.

Bei einer bevorzugten Ausführungsform der Erfindung endet die Sicke unterhalb der Reißlinie. Bei einer anderen bevorzugten Ausführungsform kreuzen sich die Sicke und die Reißlinie, wobei der spitze Kreuzungswinkel mehr als 45° beträgt. In beiden Fällen wird vermieden, daß der Aufreiß-vorgang der Sicke statt der Reißlinie folgt.In a preferred embodiment of the invention, the bead ends below the tear line. In another preferred embodiment, the bead and the tear line intersect, the acute crossing angle being more than 45 °. In both cases it is avoided that the tearing process follows the bead instead of the tear line.

Beim Aufreißvorgang ergeben sich die besten Verhältnisse, wenn die Reißlinie zumindest bis zu einer Stelle verläuft, die gegenüter der Ausgangsstelle der Reißlinie um etwa den halben Umfang der Seisenwand versetzs ist. Aus demselben Grund ist es vorteilhaft, wenn der weitere Reiß-linienabschnitt auf einer Höhe verläufs, die auf oder geringföDCgig oberhalb der Höhe liegt, auf der der größte Außendurchmesser des Randwulstes liegt. Wenn sich keiner der beiden Reißlinienabschnitte bis zur abgerundeten Übergangszone erstreckt und die Reißlinie mit dem weiteren Abschnitt in Abstand unterhalb der Deckwand, jedoch in der Seitenwand endet, so bleibt die Kappe auch nach dem Aufreißvorgang einstöDCckig, d.h. der Reißlap-pen ist auch nach dem Aufreißvorgang mit dem Restseil der Verschlußkappe verbunden und außerdem bleibt der Kappencharakter erhalten. Es besteht daher die Möglichkeis, nach Entnahme eines Teiles des Getränkes die Verschlußkappe wieder auf die FlaschermöDCndung aufzusetzen und dadurch einen gewissen beschränksen Schutz des restlichen Flascheninhaltes zu erzielen.The best results are obtained during the tearing process if the tear line extends at least to a point which is offset from the starting point of the tear line by approximately half the circumference of the iron wall. For the same reason, it is advantageous if the further tear line section runs at a height which is at or slightly above the height at which the largest outer diameter of the edge bead lies. If neither of the two tear line sections extends to the rounded transition zone and the tear line ends with the further section at a distance below the top wall but in the side wall, the cap remains one-piece even after the tear process, i.e. the tear flap is connected to the remaining rope of the closure cap even after the tear-open process and the cap character is also retained. It is therefore possible to put the cap back on the bottle mouth after removing part of the beverage and thereby achieve a certain limited protection of the remaining bottle contents.

Weitere Kennzeichen und Vorteileder vorliegenden Erfindung ergeben sich aus der Beschreibung von Ausführungsbeispielen des Erfindungsgegenstandes, deren wesentliche Merkmale in den Zeichnungen schematisch dargestellt sind.

  • Fig. 1 ist eine perspektivische Ansicht der Versch1 uß-kappe vor der Aufbringung auf die Flasche.
  • Fig. 2 ist ein Schnitt nach der Linie 11-11 der Fig.1.
  • Fig. 2a zeigt im Schnitt eine Ausführungsvariante zu Pig. 2.
  • Fig 3 ist ein Schnitt nach der Linie 111 - 111 der Fig. 1.
  • Fig. 4 ist ein perspektivische Ansicht einer Ausführungsvariante der Verschlußkappe.
  • Fig. 5 zeigt in perspektivischer Ansicht eine weitere Verschlußkappenvariante zu Fig. 1, die auf eine nur teilweise dargestellte Flasche aufgesetzt ist.
  • Fig. 6 ist ein Schnitt nach der Linie VI - VI der Fig. 5.
  • Fig. 7 ist ein Schnits nach der Linie VII - VII der Fig. 5.
  • Fig. 8 ist eine Seitenansicht einer Ausführungsvariante zu Fig. 5.
  • Fig. 9 ist eine Ansicht ähnlich zu Fig. 8, bei welcher jedoch der Reißlappen in teilweise von der Flasche abgezogenem Zustand dargessellt ist.
  • Fig. 10 zeigt eine Draufsicht auf einen Teil eines Blechrohlinges bei der Herstellung der Verschlußkappe.
Further characteristics and advantages of the present invention result from the description of exemplary embodiments of the subject matter of the invention, the essential features of which are shown schematically in the drawings.
  • Fig. 1 is a perspective view of the closure cap prior to application to the bottle.
  • Fig. 2 is a section along the line 11-11 of Fig.1.
  • 2a shows in section an embodiment variant of Pig. 2nd
  • FIG. 3 is a section along line 111-111 of FIG. 1.
  • 4 is a perspective view of an embodiment variant of the closure cap.
  • Fig. 5 shows a perspective view of a further closure cap variant of Fig. 1, which is placed on a bottle only partially shown.
  • FIG. 6 is a section along the line VI - VI of FIG. 5.
  • 7 is a section along the line VII - VII of FIG. 5.
  • FIG. 8 is a side view of an embodiment variant of FIG. 5.
  • Fig. 9 is a view similar to Fig. 8, but in which the tear tab is shown partially removed from the bottle.
  • Fig. 10 shows a plan view of part of a sheet metal blank in the manufacture of the closure cap.

Die Verschlußkappe 10 nach Fig. 1 hat im wesentlichen die Form einer kopfstehenden zylindrischen Schale mit einer zylindrischen Seitenwand 12, die über eine ringförmige abgerundete Übergangszone 16 in eine von einer ebenen Scheibe gebildete Deckwand 14 übergeht. Die Verbindungszone 16 bildet einen Sitz 13 (Fig. 2a) für eine ringförmige elastische Dichtung 18, insbesondere aus Polyäshylen, PVC oder anderem thermoplastischen Material, das seine Elastizität auch bei Kühltemperaturen, denen Getränke normalerweise ausgesetzt sind, behält und welches bei erhöhten Temperaturen nicht erweicht wird, denen Getränke normalerweise während der Sterilisierung ausgesetzt sind. Vorzugsweise besteht der Dichtungsring 18 aus einem Kunststoffschaum, der in flüssiger Form in den Sitz 13 rinnengelassen und dort durch Erwärmung ausgehärtet wird.Die Dichtung 18 kann auch eine volle Dichtungsscheibe sein, welche die Bodenfläche der Deckwand 14 völlig abdeckt. Es ist aber günstiger, wenn die Dichtung sich in radialer Richtung nach innen nicht weit über jenen Bereich hinausü streckt,welcher an der Mündung der Flasche (Fig. 6,7) anliegt.1 has essentially the shape of an upright cylindrical shell with a cylindrical side wall 12 which merges via an annular rounded transition zone 16 into a top wall 14 formed by a flat disk. The connecting zone 16 forms a seat 13 (Fig. 2a) for an annular elastic seal 18, in particular made of polyethylene, PVC or other thermoplastic material, which retains its elasticity even at cooling temperatures to which drinks are normally exposed and which does not soften at elevated temperatures to which drinks are normally exposed during sterilization. The sealing ring 18 preferably consists of a plastic foam which is let into the seat 13 in liquid form and is cured there by heating. The seal 18 can also be a full sealing disk which completely covers the bottom surface of the top wall 14. However, it is more advantageous if the seal does not extend in the radial direction inward far beyond that area which lies against the mouth of the bottle (FIGS. 6, 7).

Die Seitenwand 12 der Kappe, welche beim Aufsetzen auf die Flasche nach innen gedrückt wird, iss bei der Kappenherstellung aus einem Blech durch Stanzen und Tiefziehen im wesentlichen zylindrisch. Es kann jedoch der Unterrand 20 geringfügig nach außen abgewirkelt sein (Fig. 2a), was das Aufsetzen der Kappe auf die Flaschenmündung beim Verschluß-vorgang erleichtert.The side wall 12 of the cap, which is pressed inward when it is placed on the bottle, is essentially cylindrical in the manufacture of the cap from a sheet by stamping and deep-drawing. However, the lower edge 20 can be slightly unwound outwards (FIG. 2a), which makes it easier to put the cap on the bottle mouth during the closure process.

Mit der Seitenwand 12 ist ein Reißlappen 22 einstückig ausgebildet, dessen freies Ende von der Verschlußkappe 10 nach ihrer Formung etwa horizontal wegsteht (Fig. 2). Die Länge dieses Reißlappens 22 ist so gewählt, daß er vom Benützer zwecks Aufreissens der Verschlußkappe bequem ergriffen werden kann. Hiezu ist dieser Reißlappen 22 so lang, daß er sich bei aufgebrachter Verschlußkappe bis über jenen Flaschenwulst nach unten erstreckt, welcher unmittelbar unterhalb des Randwulstes der Flasche liegt. Auf diese Weise kann der Reißlappen 22 beim Öffnungsvorgang leicht vom Flaschenhals abgezogen werden.A tear tab 22 is formed in one piece with the side wall 12, the free end of which protrudes approximately horizontally from the closure cap 10 after it has been formed (FIG. 2). The length of this tear tab 22 is selected so that it can be comfortably gripped by the user for the purpose of tearing open the closure cap. For this purpose, this tear flap 22 is so long that it extends with the closure cap applied down over that bottle bead which lies immediately below the rim bead of the bottle. In this way, the Tear flaps 22 are easily pulled off the bottle neck during the opening process.

Der Reißlaapen 22 hat einen Abschnitt 24, der eine Fortsetzung der Seitenwand 12 nach unten und damit gleichsam eine Zugabe bildet, welche verhindert, daß der Reiß1 ap-pen bei der Andrückung der Verschlußkappe beim Aufsetzvorgang auf die Flasche unzulässig verformt wird. Das Ende 25 des Reißlappens 22 kann abgerundet sein (Fig. 1).The tear sheet 22 has a section 24 which forms a continuation of the side wall 12 downward and thus, as it were, an addition which prevents the tear tab from being deformed inadmissibly when the closure cap is pressed onto the bottle when it is placed on it. The end 25 of the tear tab 22 can be rounded (FIG. 1).

Der Reißlappen erstreckt sich entlang des Umfanges der Seitenwand 12 nur über einen Bruchteil desselben. Seine Übergangsstellen in den Unterrand 20 der Seitenwand 12 sind abgerundet.The tear tab extends along the circumference of the side wall 12 only over a fraction of the same. Its transition points in the lower edge 20 of the side wall 12 are rounded.

In der Seitenwand 12 verläuft eine Reißlinie 27 annähernd um den halben Umfang der Seitenwand 12. Diese Reiß-linie 27 hat drei Abschnitte 28, 29, 30, die bei der Ausführungsform nach den Fig. 1 und 2 kontinuierlich ineinander übergehen. Die Reißlinie 27 hat ihre Ausgangsstelle 26 an der abgerundeten Übergangsstelle zwischen dem Reißlappen 22 und der Seitenwand 12 und ihr erster Abschnitt 28 steigt im spitzen Winkel zur Horizontalebene an. Der zweite Abschnitt 29 verläuft flacher nach oben gegen die Deckwand 14 zu und sodann horizontal und geht in den dritten, ebenfalls horizontal verlaufenden Abschnist 30 über, welcher etwas unserhalb der Deckwand 14 etwa um die Hälfte des Umfanges der Seitenwand 12 herumläuft. Der Winkel, welchen die Reißlinien-abschnitte 28,29 mit der Horizontalebene einschließen, solite geringer als 75°, vorzugsweise geringer als 45° sein, z.B. zwischen 15° und 45°, liegen, um in der Praxis die besten Verhältnisse für den Aufreißvorgang zu sichern. Der Reißli-nienabschnitt 30 sollte so tief angeordnet sein, etwa 2,5 mm unterhalb der Deckfläche 14, daß der Großteil der Dichtung 18 nicht gestört wird. Auf diese Weise wird gesichers, daß beim Öffnungsvorgang die Dichtung 18 möglichst lange unverletzt bleibt. Die Anordnung solite auch so gesroffen sein, daß unterhalb der Reißlinie 27 ein die Zugkräfte beim Öffnen der Verschlußkappe aufnehmender Streifen verbleibt, dessen Breite etwa 2 bis 3 mm betragen sollte.In the side wall 12, a tear line 27 runs approximately around half the circumference of the side wall 12. This tear line 27 has three sections 28, 29, 30, which in the embodiment according to FIGS. 1 and 2 merge continuously into one another. The tear line 27 has its starting point 26 at the rounded transition point between the tear tab 22 and the side wall 12 and its first section 28 rises at an acute angle to the horizontal plane. The second section 29 runs flatter upwards towards the top wall 14 and then horizontally and merges into the third, also horizontally running section 30, which runs somewhat around the top wall 14 about half the circumference of the side wall 12. The angle which the tear line sections 28, 29 form with the horizontal plane should be less than 75 °, preferably less than 45 °, e.g. between 15 ° and 45 °, in order to ensure the best conditions for the tearing process in practice. The tear line section 30 should be arranged so deep, approximately 2.5 mm below the top surface 14, that the majority of the seal 18 is not disturbed. In this way it is assured that the seal 18 remains intact for as long as possible during the opening process. The arrangement should also be such that below the tear line 27 there remains a strip which absorbs the tensile forces when the closure cap is opened, the width of which should be about 2 to 3 mm.

Die Reißlinie 27 endet eswa 140 bis 180° gegenüber der Ausgangsstelle 26 verseszt auf derselben Höhe wie der Abschnitt 30. Die Länge der Reißlinie 27 sollte genügend groß sein, um die Verschlußkappe nach Durchlaufen der Reißlinie leicht von der Flasche abnehmen zu können.The tear line 27 ends approximately 140 to 180 ° opposite the starting point 26 at the same height as the section 30. The length of the tear line 27 should be large enough to be able to easily remove the closure cap from the bottle after passing through the tear line.

Die Reißlinie 27 wird im Material der Verschlußkappe 10 während deren Herstellung ausgebildet, und zwar wird sie in den Blechrohling im flachen Zustand desselben eingearbeitet, bevor die Verschiußkappe 10 in ihre endgültige Gestalt tiefgezogen wird. Mittels eines geeignesen Wenkzeuges wird die Reißlinie als Nut ausgebildet, deren Boden 34 (Fig. 3) flach ist. Das Material im Bereich 36 unter der Reißlinie 27 dürfse bei der Ausformung der Reißlinie 27 eine Kalshärtung erfahren, so daß das Abziehen des Reißlappens 22 entlang der Reißlinie 27 erleichtert wird, ohne die Gesamtfessigkeit und dadurch das Dichtungsverhalten der Verschlußkappe 10 nachteilig zu beeinflussen. Die die Reißlinie 27 bildende Nut ist gegen das Innere der Seitenwand 12 offen.The tear line 27 is formed in the material of the closure cap 10 during its manufacture, namely that it is incorporated into the sheet metal blank in the flat state thereof before the closure cap 10 is deep-drawn into its final shape. Using a suitable tool, the tear line is formed as a groove, the bottom 34 (FIG. 3) of which is flat. The material in the area 36 under the tear line 27 may be hardened when the tear line 27 is formed, so that the pulling off of the tear tab 22 along the tear line 27 is facilitated without adversely affecting the overall strength and thereby the sealing behavior of the closure cap 10. The groove forming the tear line 27 is open to the inside of the side wall 12.

Der Reißlappen 22 hat an seiner Innenwand eine Sicke 38' (Fig. 2) in Form einer U-förmigen Auswölbung, die an der Außenseite des Reißlappens 22 eine Rippe 38 bildet, die den Reißlappen 22 verstärkt. Die Enden 40, 42 dieser Rippe 38 liegen wesentlich höher als der Unterrand 20 der Seitenwand 12, kreuzen jedoch die Reißlinie 27 nicht und erstrecken sich nicht in die Dichtung 18. Im Bereich der Enden 40, 42 der Sicke 38' hat das Material der Verschlußkappe eine Häufung von Falten, auch nach der Aufbringung der Verschiuß-kappe auf die Flasche, so daß bei Auftreten eines vorherbestimmten Innendruckes der übermäßige Überdruck vornehmlich in diesem Bereich verläßlich abgelassen wird, worauf die Verschlußkappe wieder einwandfrei dichtet. Dieser Abblaseeffekt läßs sich durch geeignete Materialwahl in Verbindung mit der Ausbildung und Art der Verschiußkappe optimal einstellen. In der Praxis erprobte Ausführungen bliesen zwischen 8 und 10 bar ab, wobei der Innendruck in der Flasche auf etwa 5 bar abgesenkt und anschließend wieder abgedichtet wurde. Diese Ausführungsformen bestanden aus einer tiefgezogenen Aluminium-kappe aus einem Aluminiumblech mit einer Dicke zwischen 180 und 190 Mikron, da seine Zugfestigkeit zwischen 120 und 160 Newson/mm2 aufwies. Das Aluminium hatte eine Reinheit von eswa 99%. Der Innendruck in Getränkeflaschen beträgt bei normalen Transport- und Lagerungs-bedingungen bis etwa 6 bar, jedoch kann durch Schütteln und/oder Erwärmung der Flasche ein Innendruck von über 10 bar entstehen.The tear tab 22 has on its inner wall a bead 38 '(FIG. 2) in the form of a U-shaped bulge which forms a rib 38 on the outside of the tear tab 22 which reinforces the tear tab 22. The ends 40, 42 of this rib 38 are substantially higher than the lower edge 20 of the side wall 12, but do not cross the tear line 27 and do not extend into the seal 18. In the region of the ends 40, 42 of the bead 38 ', the material of the closure cap has an accumulation of wrinkles, even after the cap has been applied to the bottle, so that when a predetermined internal pressure occurs, the excess pressure, especially in this area, is reliably released, whereupon the cap seals properly again. This blow-off effect can be optimally adjusted by a suitable choice of material in connection with the design and type of the closure cap. Versions tried and tested in practice blow off between 8 and 10 bar, the internal pressure in the bottle being reduced to about 5 bar and then sealed again. These embodiments consisted of a deep-drawn aluminum cap made of an aluminum sheet with a thickness between 180 and 190 microns, since its tensile strength was between 120 and 160 Newson / mm 2 . The aluminum was 99% pure. Under normal transport and storage conditions, the internal pressure in beverage bottles is up to around 6 bar, but shaking and / or heating the bottle can result in an internal pressure of over 10 bar.

Es hat sich herausgestellt, daß zur Erzielung des Abblaseeffektes Aluminiumbleche üblicher Zusammensetzung und einer Dicke zwischen 140 und 250 Mikron und einer Zugfestigkeit zwischen 90 und 220 Newton/mm2 geeignet sind. Bevorzugte Bereiche liegen zwischen 180 und 220 Mikron sowie zwischen 130 und 180 Newton/mm2. Die erwähnte Zugfestigkeit gilt vor der Formung der Verschlußkappe.It has been found that aluminum sheets of conventional composition and a thickness between 140 and 250 microns and a tensile strength between 90 and 220 Newton / mm 2 are suitable for achieving the blow-off effect. Preferred ranges are between 180 and 220 microns and between 130 and 180 Newtons / mm 2 . The tensile strength mentioned applies before the cap is formed.

Einige Beispiele von Aluminiumlegierungen zur Hersteliung erfolgreich arbeitender Verschlußkappen mit selbsttätigem Abblaseeffekt sind in der folgenden Tabelle enthalten.:

Figure imgb0001
Some examples of aluminum alloys for the manufacture of successfully working caps with an automatic blow-off effect are contained in the following table:
Figure imgb0001

Bei der Aufbringung der Verschlußkappe auf eine Getränkeflasche der eingangs beschriebenen Art wird die Kappe in einer mit Fingern versehenen Hülse gehalten und mit dieser auf die Flasche aufgesetzt. Sodann wirdWhen the closure cap is applied to a beverage bottle of the type described at the outset, the cap is held in a sleeve provided with fingers and placed on the bottle with it. Then will

die Kappe gegen die Flaschenmündung mis einem solchen Druck gedrückt, daß das Material der Dichtung elastisch zusammengedrückt wird. Sodar.n wird die Hülse rund um den Wulstrand der Flasche zusammengezogen und drückt den Unterrand 20 der Seitenwand 12 der Kappe in die Ringnut zwischen dem Wulstrand und der an-schließenden Flaschenausbauchung unter Faltenbildung ein. Gleichzeitig wird die Übergangszone 16 an das abgerundete Profil des Wulstrandes der Flasche angedrücks, wobei der Krümmungsradius der Übergangszone 16 vergrößert wird. Durch die bei diesen Vorgängen auftretenden Beanspruchungen ergibt sich, ebenso wie bei der Herstellung der Verschlußkappe, eine durch Kaltverformung des Metalles hervorgerufene Materialhärtung, welche über den Umfang der Verschlußkappe im wesentlichen gleichförmig ist. Diese Effekte sind reproduzierbar und können durch geringe Änderungen der Dicke und Zugfestigkeis des verwendeten Aluminiumbleches eingestellt werden, so daß der gewünschse Abblaseeffekt im wesentlichen innerhalb eines vorherbestimmbaren Druckbereiches auftrist.the cap is pressed against the bottle mouth at such a pressure that the material of the seal is compressed elastically. Sodar.n the sleeve is pulled together around the beaded edge of the bottle and presses the lower edge 20 of the side wall 12 of the cap into the annular groove between the beaded edge and the subsequent bottle bulge with the formation of folds. At the same time, the transition zone 16 is pressed against the rounded profile of the bead edge of the bottle, the radius of curvature of the transition zone 16 being increased. The stresses that occur during these processes, like the manufacture of the closure cap, result in material hardening caused by cold deformation of the metal, which is essentially uniform over the circumference of the closure cap. These effects are reproducible and can be adjusted by slight changes in the thickness and tensile strength of the aluminum sheet used, so that the desired blow-off effect occurs essentially within a predetermined pressure range.

Es ist auch anzunehmen, daß die erwählte Materialhärtung und die damit verbundene Erhöhung der Maserialelastizität das Auftreten des beschriebenen Abblaseeffektes begünstigt bzw. überhaupt erst ermöglicht, denn es tritt beim Abblasen eine geringe Aufweitung der Verschlußkappe und/oder eine Anhebung derselben in Bezug auf den Flaschenhals auf, so daß ein Teil des Gases aus der Flasche entweichen kann, wobei bei dieser Aufweitung der Verschlußkappe das Material im elastischen Bereich verbleiben muß. Die Elastizität des kaltgehärteten Bleches der Verschlußkappe führt diese hierauf wieder in die dichtende Ausgangsstellung zurück.It can also be assumed that the selected material hardening and the associated increase in the elasticity of the fibers favor or in the first place enable the described blow-off effect to occur, because there is a slight expansion of the closure cap and / or an increase thereof with respect to the bottle neck during the blow-off , so that part of the gas can escape from the bottle, with this expansion of the cap the material must remain in the elastic range. The elasticity of the cold-hardened sheet metal of the closure cap then leads it back into the sealing starting position.

Die Verschluükappe 10 nach Fig. 4 ähnelt jener nach Fig. 1 mit zwei Ausnahmen. Der erste Unterschied besteht darin, daß das Ende 25 des Reißlappens 22 geradlinig verläuft, jedoch schräg in Bezug auf die beiden Seitenränder 48, 50, so daß der der Ausgangsstelle 26 der Reißlinie 27 näher liegende Seitenrand 48 länger ist als der andere Seitenrand 50. Dies veranlaßt den Benutzer, den Reißlappen näher dem Seitenrand 48 zu erfassen und ihn nach rechts zu ziehen, so daß der Aufreißvorgang entlang der Reiß1 inie 27 in der richtigen Richtung begonnen wird, obwohl die Reißli-nie 27 dem Benutzer nicht sichtbar ist, da sie ja an der Innenwand der Kappe liegt.4 is similar to that of FIG. 1 with two exceptions. The first difference is that the end 25 of the tear tab 22 extends in a straight line, but obliquely with respect to the two side edges 48, 50, so that the side edge 48 closer to the starting point 26 of the tear line 27 is longer than the other side edge 50. This causes the user to grasp the tear tab closer to the side edge 48 and pull it to the right so that the tear along the tear line 27 begins in the correct direction, although the tear line 27 is not visible to the user since it is is on the inside wall of the cap.

Der zweite Unterschied besteht darin, daß das obere Ende 42 der Rippe 38 sich nach oben bis in den Bereich der Deckwand 14 erstreckt. Auf diese Weise wird dort eine Schwachstelle in der Dichtung 18 gebildet, da die innen an der Kappe befindliche Sicke 38' an der Rückseite der Rippe 38 im Bereich des Endes 42 derselben eine kanalartige Verbindung von der Dichtung 18 zur Reißlinie 27 bildet. Selbst wenn das Material der Dichtung 18 diese Sicke 38' ausfüllen sollte, so bildet ihr oberes Ende (bei 42) dennoch die schwächste Stelle für das Entweichen von Überdruck aus dem inneren der Flasche beim Offnen der Verschlußkappe, da n dieser Stelle der die Dichtung 18 gegen die FLaschenmündung drückende Druck am geringsten ist. Das Gas aus der Flasche ist daher bereits entwichen, wenn der Abreißvorgang des Reißlappens 22 zu Ende ist, so daß der Überdruck in der Flasche dann völlig abgebaut ist und die Verschlußkappe 10 daher nicht abgeschleudert werden kann.The second difference is that the upper end 42 of the rib 38 extends up to the area of the top wall 14. In this way, a weak point is formed there in the seal 18, since the bead 38 ′ located on the inside of the cap on the rear of the rib 38 in the region of the end 42 forms a channel-like connection from the seal 18 to the tear line 27. Even if the material of the seal 18 should fill this bead 38 ', its upper end (at 42) nevertheless forms the weakest point for the escape of excess pressure from the inside of the bottle when the cap is opened, since the seal 18 is located at this point pressure against the bottle mouth is lowest. The gas from the bottle has therefore already escaped when the tearing process of the tear tab 22 has ended, so that the excess pressure in the bottle is then completely eliminated and the closure cap 10 cannot therefore be thrown off.

Es steht nicht mit Sicherheit fest, ob das Gas den Weg zwischen der Dichtung 18 und der Flaschenmündung oder zwischen der Dichtung 18 und dem Sitz 13 nimmt, aber die Schwachstelle, welche durch die Ungleichmäßigkeit an der Innenseite des Endes 42 der Rippe.38 erzeugt wird, läßt das Gas auf dem einen oder dem anderen Weg oder auch auf beiden Wegen entweichen. Wenn die Dichtung 18 an der inneren metallischen Oberfläche des Sitzes 13 nicht haftet, so könnte das Gas zwischen der Dichtung 18 und dieser metallischen Oberfläche zur Sicke 38' unter dem Ende 42 der Rippe 38 strömen.It is not certain with certainty whether the gas will travel between the seal 18 and the bottle mouth or between the seal 18 and the seat 13, but the weak point created by the non-uniformity on the inside of the end 42 of the rib 38 , allows the gas to escape one way or the other, or both. If the seal 18 does not adhere to the inner metallic surface of the seat 13, the gas between the seal 18 and this metallic surface could flow to the bead 38 'under the end 42 of the rib 38.

Der andere Schenkel der U-förmigen Rippe 58 (Fig. 4) erstreckt sich mit seinem Ende 40 nicht so weit nach oben und kreuzt den ansteigenden Abschnitt 28 der Reißlinie 27 nicht. Um zu vermeiden, daß beim Aufreißvorgang der Riß der Sicke 38' statt der Reißlinie 27 folgt und um für einen zusätzlichen Druckabbau beim Offnen der Flasche zu sorgen, darf eine Kreuzung zwischen diesem Ende 40 der Rippe 38 und der Reißlinie 27 nur in deren im wesentlichen horizontalen Abschnitten 29, 30 auftreten.The other leg of the U-shaped rib 58 (FIG. 4) does not extend so far upwards with its end 40 and does not cross the rising section 28 of the tear line 27. In order to avoid that the tear follows the bead 38 'instead of the tear line 27 during the tearing process and to provide for an additional pressure reduction when the bottle is opened, a cross between this end 40 of the rib 38 and the tear line 27 may only essentially exist in the latter horizontal sections 29, 30 occur.

Die Fig. 5, 6 und 7 zeigen die Verschlußkappe 10 in auf die Flasche 62 für ein Getränk aufgesetztem Zustand. Die Flasche, von welcher lediglich der oberste Abschnitt dargestells ist, besteht zumeist aus Glas, gegebenenfalls jedoch auch aus Kunststoff. Die Flasche 62 hat an ihrem oberen Ende einen Randwulst 64, dessen Ende 66 einen etwas abgeflachten mittigen Abschnitt aufweist, ansonsten jedoch abgerundet ist. Die Außenfläche des Randwulstes 64 ist nach innen eingezogen und endet in einer Ringnut 68 am Flaschenhals. Unterhalb dieser Ringnut 68 liegt eine Ausbuchtung 70 zur Verstärkung des Flaschenhalses. Diese Flaschenform ist weltweit genormt, wobei in fast allen Fällen der maximale Durchmesser des Randwulstes 64 etwa 26,5 mm beträgt. Der innendurchmesser der Seitenwand 12 der Verschlußkappe ist nun derart gewählt, daß sie beim ersten Schritt ihrer Aufbringung passend auf dem Flaschenende sitzt. Bei der beschriebenen Eindrückung der Seitenwand 12 unter den Randwulst 64 ist nur ein geringer Axialdruck erforderlich. Der Boden der Seitenwand 12 hat trotz der Faltenbildung des Materiales praktisch keinesichtbaren Rillen, so daß eine Beschriftung klar lesbar bleibt, auch wenn sie auf das Blech vor der Formung der Verschluß-kappe aufgebracht wurde.5, 6 and 7 show the closure cap 10 in the state placed on the bottle 62 for a drink. The bottle, of which only the uppermost section is shown, consists mostly of glass, but possibly also of plastic. The bottle 62 has at its upper end an edge bead 64, the end 66 of which has a somewhat flattened central section, but is otherwise rounded. The outer surface of the bead 64 is drawn inwards and ends in an annular groove 68 on the bottle neck. Below this annular groove 68 there is a bulge 70 for reinforcing the bottle neck. This bottle shape is standardized worldwide, whereby in almost all cases the maximum diameter of the edge bead 64 is approximately 26.5 mm. The inside diameter of the side wall 12 of the closure cap is now chosen such that it fits snugly on the bottle end in the first step of its application. When the side wall 12 is pressed in under the bead 64, only a small axial pressure is required. The bottom of the side wall 12 has, despite the wrinkling of the material, practically invisible grooves, so that a label remains clearly legible, even if it was applied to the metal sheet before the closure cap was formed.

Wie bereits erwähnt, beginnt der Aufreißvorgang an der Ausgangsstelle 26 der Reißlinie 27 durch Abziehen des Reiß-lappens 22 nach rechts (Fig. 9). Aus den Fig. 5 und 7 ist ersichtlich, daß das Ende 40 des einen Schenkels der U-förmigenRippe 38 bis fast zur Reißlinie 27 reicht, das andere Ende 42 sogar darüberhinaus. Dementsprechend weit reicht auch die Sicke 38' (Fig. 7). Infolge der im Vergleich zur Ausführungsform nach Fig. 1 größeren Länge des zum Ende 42 führenden Schenkels der Rippe 38 entsteht im Seitenwandmaterial der Kappe eine stärkere Faltenbildung, wobei diese Falten bis zur Dichtung 18 reichen, so daß dort eine begrenzte Schwachstelle der Abdichtung gebildet wird, die den schwächsten Teil der Dichtung bildet, so daß das aus der Flasche austretende Gas vor allem diese Schwachstelle als Austrittsstelle vorfindet. Diese Schwachstelle ist zwar ganz klein, denn geeignete Rippen 38 haben eine Breite in der Größen-ordnung von etwa 1 mm, jedoch reicht dies aus, um beim Auf-reißvorgang einen Druckabbau aus dem Flascheninneren herbeizuführen, noch bevor der Aufreißvorgang über die ganze Länge der Reiß1 inie 27 geführt ist. Obwohl die Rippe 38 durch den Druck beim Aufsetzen der Verschlußkappe auf die Flaschenmündung in die Ringnut 68 eingedrückt und daher verdrückt wird, bildet die Sicke 38' unterhalb des oberen Teiles der Rippe 38 immer noch die schwächste Stelle entlang des Umfanges der Dichtung 18. Wenn daher der Aufreißvorgang der Seitenwand 12 entlang der Reißlinie 27 beendet ist, ist zumindest ein Großteil des Überdruckes in der Flasche bereits während dieses Aufreißvorganges abgebaut worden, so daß keine oder nur mehr geringe Gefahr besteht, daß die Verschluß- kappe abgeschleudert wird und daß dabei Flüssigkeit verloren geht.As already mentioned, the tearing process begins at the starting point 26 of the tearing line 27 by pulling the tearing flap 22 to the right (FIG. 9). 5 and 7 it can be seen that the end 40 of one leg of the U-shaped rib 38 extends almost to the tear line 27, the other end 42 even beyond. Correspondingly, the bead 38 'also extends (FIG. 7). As a result of the greater length of the leg of the rib 38 leading to the end 42 compared to the embodiment according to FIG. 1, greater wrinkling occurs in the side wall material of the cap, these folds reaching as far as the seal 18, so that a limited weak point of the seal is formed there. which forms the weakest part of the seal, so that the gas escaping from the bottle primarily finds this weak point as the exit point. This weak point is very small, because suitable ribs 38 have a width of the order of about 1 mm, however is this sufficient to bring about a pressure reduction from the inside of the bottle during the tearing process, even before the tearing process is carried out over the entire length of the tearing line 27. Although the rib 38 is pressed into the annular groove 68 by the pressure when the closure cap is placed on the bottle mouth and is therefore pressed, the bead 38 'below the upper part of the rib 38 still forms the weakest point along the circumference of the seal 18. If, therefore, If the tear-open process of the side wall 12 along the tear line 27 has ended, at least a large part of the overpressure in the bottle has already been reduced during this tear-open process, so that there is little or no danger that the closure cap will be thrown off and that liquid will be lost in the process goes.

Bei der Ausführungsform nach den Fig. 8 und 9 hat der Reißlappen 22 eine U-förmige Rippe 38, die jedoch nicht bis zur Reißlinie 27 reicht und hauptsächlich zur Verstärkung und Absteifung des Reißlappens 22 dient. Eine zusätzliche, mittige Rippe 38 dient zum Abbau des in der Flasche herrschenden Druckes. Diese mittige Rippe 38 kreuzt die Reißli-nie 27 annähernd rechtwirkelig und erstreckt sich in der Seitenwand 12 nach oben bis in den oberen Teil der abgerundeten Übergangsstelle 16 und daher bis zur Dichtung 18. inIn the embodiment according to FIGS. 8 and 9, the tear tab 22 has a U-shaped rib 38, which, however, does not extend to the tear line 27 and mainly serves to reinforce and reinforce the tear tab 22. An additional, central rib 38 serves to relieve the pressure prevailing in the bottle. This central rib 38 crosses the tear line 27 approximately in a right-angled manner and extends in the side wall 12 up to the upper part of the rounded transition point 16 and therefore to the seal 18 in

Fig. 9 ist der Reißlappen 22 teilweise abgezogen dargestellt wobei der obere Abschnitt der Rippe 38 von ihrem unteren Abschnitt getrennt ist. Durch Pfeile ist angedeuset, wie das Gas über den vom oberen Abschnitt der Rippe 38 gebildeten Kanal und bzw. oder in dessen Nachbarschaft entweicht, so daß der Uberdruck in der Flasche beim Öffnungsvorgang abgebaut wird, obwohl noch der Restteil der Verschlußkappe 10 auf der Flasche sitzt.9, the tear tab 22 is shown partially pulled away, the upper portion of the rib 38 being separated from its lower portion. Arrows indicate how the gas escapes via the channel formed by the upper section of the rib 38 and / or in the vicinity thereof, so that the overpressure in the bottle is reduced during the opening process, even though the remaining part of the closure cap 10 is still on the bottle .

Fig. 10 zeigt eine Abwicklung eines Teiles des Blechrohlings für die Verschlußkappe 10 in Draufsicht, vor der Formung der Verschlußkappe. Es ist an der Innenseite einer Rippe eine Sicke 38' wie bei den Ausführungsformen nach den Fig. 8 und 9 vorgesehen. Die parallelen strichlierten Linien 102, 104 stellen den Abschnitt dar, in welchem die Dichtung 18 anliegen wird. Vorzugsweise wird ein Klebstoff, z.B. in Form eines Lackes, auf die Oberfläche des Bleches im wesentlichen nur in der zwischen den beiden Linien 102,104 liegenden Zone 106 aufgebracht, welche über einen Teil ihres Umfanges im Bereich der Sicke 38' eine Unterbrechung 108 hat. Auf diese Weise wird gesichert, daß die Dichtung 18 an der Sicke 38' nicht haftet, obwohl diese Sicke vom Dichtungsmaterial ausgefüllt wird. Wenn daher beim Aufreißen entlang der Reiß-linie 27 die Seitenwand 12 in zwei Teile geteilt wird, wobei die Sicke 38' gekreuzt wird, wird dadurch eine erhöhte Wahrscheinlichkeit dafür geschaffen, daß das Gas durch den derart geschwächten Dichtungsbereich an der Sicke zwischen der Dichtung und der metallischen Oberfläche entweichen kann. Diese Wahrscheinlichkeit ist wesentlich höher als jene für ein Entweichen des Gases zwischen der Dichtung und dem axialen Ende 66 (Fig. 6) der Flasche.Fig. 10 shows a development of a part of the sheet metal blank for the closure cap 10 in plan view, before the formation of the closure cap. A bead 38 'is provided on the inside of a rib as in the embodiments according to FIGS. 8 and 9. The parallel dashed lines 102, 104 represent the section in which the seal 18 will lie. Preferably an adhesive, e.g. in the form of a lacquer, applied to the surface of the sheet essentially only in the zone 106 lying between the two lines 102, 104, which has an interruption 108 over part of its circumference in the region of the bead 38 '. In this way it is ensured that the seal 18 does not adhere to the bead 38 ', although this bead is filled with the sealing material. Therefore, if the side wall 12 is divided into two parts while tearing along the tear line 27, the bead 38 'being crossed, this creates an increased probability that the gas through the weakened sealing area on the bead between the seal and can escape from the metallic surface. This probability is much higher than that for gas leakage between the seal and the axial end 66 (Fig. 6) of the bottle.

Beim selbsttätigen Druckabbau hingegen, d.h. bei auf die Flasche aufgesetzter und unverletzter Verschlußkappe und bei Uberschreiten eines vorbestimmten Wertes des Innendruckes in der Flasche, kann das Gas zwischen der Dichtung 18 und dem axialen Ende 66 der Flasche entweichen. Es wird angenommen, daß die Elastizität der Seitenwand 12 eine geringfügige Aufweitung ihres Unterrandes 20 ermöglicht, wenn die Verschlußkappe geringfügig entlang des Randwulstes 64 angehoben winä. Bei dieser Anhebung der Verschlußkappe kann das Gas unter die Dichtung 12 einströmen und entlang der Seitenwand 12 der Verschlußkappe 10 im Bereich der durch die Faltenbildung im Material der Seitenwand bedingten, bereits erwähnten Schwachstelle austreten.With automatic pressure reduction, however, i.e. when the cap is placed on the bottle and is undamaged and when a predetermined value of the internal pressure in the bottle is exceeded, the gas can escape between the seal 18 and the axial end 66 of the bottle. It is believed that the elasticity of the side wall 12 allows a slight expansion of its lower edge 20 when the cap is slightly raised along the bead 64. With this lifting of the sealing cap, the gas can flow in under the seal 12 and emerge along the side wall 12 of the sealing cap 10 in the region of the weak point already mentioned which is caused by the fold formation in the material of the side wall.

Die Deckwand 14 kann auch aufgewölbt sein. Diese Aufwölbung kann von vorneherein bei der Herstellung der Kappe erzeugt werden, ebenso wie die Deckwand eine Profilierung, z.B. durch Tiefziehen, Prägen od. dgl., aufweisen kann. Die Aufwölbung der Deckwand 14 aus ihrer ursprünglichen ebenen Gestalt kann sich aber auch unter Einf1 uß der bei der Aufbringung der Kappe auf die Flasche einwirkenden Kräfte einstellen und bzw. oder unter Einf1 uß des in der Flasche herrschenden Gasdruckes.The top wall 14 can also be arched. This bulge can be created right from the start when the cap is manufactured, as can the top wall a profile, e.g. by deep drawing, embossing or the like. The arching of the top wall 14 from its original flat shape can also occur under the influence of the forces acting on the bottle when the cap is applied and / or under the influence of the gas pressure prevailing in the bottle.

Es sind zahlreiche, nicht in der Zeichnung dargestellte Varianten der Erfindung denkbar. Beispielsweise kann der Reißlappen andere Gestalt haben, als dies in der Zeichnung dargestellt ist. Weiters kann im Reißlappen oder oberhalb desselben ein einziger, an seiner Unterseite eine Sicke bildender Rippenabschnitt vorgesehen sein, oder eine serie solcher Rippenabschnitte, wobei in allen Fällen bei der Öffnung der Verschlußkappe ein allmählicher Druckabbau erzielbar ist. Die Reiß1 inie kann auch durch eine Perforationsreihe im Material der Seitenwand gebildet sein oder zumindest eine Unterbrechung entlang ihres Verlaufes aufweisen, wodurch die Geschwindigkeit des Aufreißens der Kappe entlang der Reißlinie örtlich verzögert oder sogar gestoppt werden kann. Die Reißlinie kann auch von zumindest zwei zueinander parallel verlaufenden Linienzügen gebildet sein.Numerous variants of the invention, not shown in the drawing, are conceivable. For example, the tear tab can have a different shape than that shown in the drawing. Furthermore, a single rib section forming a bead on its underside or a series of such rib sections can be provided in the tear tab or above it, in all cases a gradual reduction in pressure can be achieved when the closure cap is opened. The tear line can also be formed by a row of perforations in the material of the side wall or at least have an interruption along its course, as a result of which the speed at which the cap is torn open along the tear line can be locally delayed or even stopped. The tear line can also be formed by at least two lines running parallel to one another.

Selbstverständlich läßt sich die Erfindung auch auf Verschlußkappen aus Stahl anwenden, die in geeigneter Weise durch korrosionshindernde Beschichtungen oder Überzüge geschüszt sind, ebenso wie auf Verschlußkappen aus anderen Metallen. Die Verwendung von Blech aus Aluminium, oder Aluminiumlegierungen ist jedoch zumeist bevorzugt, da diese Materialien leichser sind als Stahl und sich leichser auf-reißen lassen.Of course, the invention can also be applied to steel caps which are suitably protected by corrosion-inhibiting coatings or coatings, as well as to caps made of other metals. However, the use of sheet metal made of aluminum or aluminum alloys is mostly preferred, since these materials are lighter than steel and are easier to tear open.

Die Übergangszone 16 ist als Verlängerung der Seitenwand 12 aufzufassen, so daß der Begriff "Seitenwand" auch diese Ubergangszone beinhaltet. Unter "Getränk" ist jedes flüssige oder breiige Nahrungsmittel zu verstehen, das in Flaschen verkaufs oder ausgegeben wird.The transition zone 16 is to be understood as an extension of the side wall 12, so that the term “side wall” also includes this transition zone. "Drink" means any liquid or pulpy food that is sold or dispensed in bottles.

Claims (24)

1. Closure cap (10) for beverage bottles (62) which have a beaded rim (64) including an annular axial end (66) and an annular groove (68) where the beaded rim merges into the bottle neck, and in which the beverage in the bottle (62), after the closure cap (10) has been installed thereon, is subjected to effects increasing the interior pressure in the space above the beverage, which closure cap (10) comprises a body member which fits over the beaded rim of the bottle and can thereby be brought with its side wall (12) into engagement with the annular groove (68), said substantially cylindrical side wall (12) passes over its rounded transition zone (16) into a cover wall (14), said transition zone (16) forming on its inner side a seat for a sealing member (18) covering at least an upper section of the inner surface of the side wall (12) and extending in radial inward direction along the cover wall (14) at least to such an extent that the sealing member (18) engages the axial end (66) of the bottle (62) when the closure cap is installed, a rip tab (22) which extends from the lower edge (20) of the side wall (12) along a fraction of its circumference and consists with the body member of one single piece of sheet metal and forms an extension of the side wall (12) and is then angled laterally and substantially normal to said extension, but can be bent towards the bottle neck after installation of the closure cap (10) on the bottle (12), and a rip line (27), at least most of which is formed in the side wall (12) of the body member, said rip line has at least two portions (28,29,30), the starting portion (28) of which commences at a location containing the transition of the one lateral edge (48) of the rip tab (22) into the lower edge (20) of the side wall (12) and extends in a rise from there circumferentially of the side wall (12) towards the rounded transition zone (16) such that the other lateral edge (50) of the rip tab (22) is passed, a further rip line portion (30) extending spaced apart below the cover wall (14) circumferentially of the side wall (12), characterized in that in the rip tab zone at least one groove (38') is provided in the side wall (12) for stabilizing a venting effect at overpressure, said groove extends substantially parallel to the axis of the closure cap and is vaulted outwardly.
2. Closure cap according to claim 1, characterized in that the groove (38') terminates below the rip line (27).
3. Closure cap according to claim 1, characterized in that the groove (38') and the rip line (27) cross each other and that the acute angle of intersection is more than 45°
-4. Closure cap according to anyone of claims 1 to 3, characterized in that the rip line (27) extends at least to a location displaced with respect to the starting location (26) of the rip line (27) for approximately the half circumference of the side wall (12).
5. Closure cap according to anyone of claims 1 to 4, characterized in that the further rip line portion (30) extends at a level at or slightly above the level of the outermost diametrical extent of the beaded rim (64).
6. Closure cap according to anyone of claims 1 to 5, characterized in that no one of these two rip line portions (28,30) extends to the rounded transition zone (16) and that the rip line (27) terminates with the further portion (30) spaced apart below the cover wall (14) but in the side wall (12).
7. Closure cap according to anyone of claims 1 to 6, characterized in that the rip line (27) extends on the inner side of the side wall (12).
8. Closure cap according to anyone of claims 1 to 7, characterized in that the rip line (27) is a groove having converging walls and a flat bottom (34).
9. Closure cap according to anyone of claims 1 to 8, characterized in that the rip tab (22) has a sloping free end (25) so that its two lateral edges (48,50) are of different length, the longer lateral edge (48) leading to the commencement location (26) of the rip line (27).
10. Closure cap according to anyone of claims 1 and 3 to 9, characterized in that at least one groove (38') extends to the sealing member (18).
11. Closure cap according to anyone of claims 1 to 10, characterized in that at least one groove (38') forms a rib (38) on the outer surface of the rip tab (22) for strengthening the rip tab (22).
12. Closure cap according to claims 10 and 11, characterized in that at least one groove (38') is directed substantially towards the center of the rip tab (22) and extends upwardly beyond the rip line (27) at least to the sealing member (18).
13. Closure cap according to anyone of claims 1 to 12, characterized in that the body member of the closure cap(IO) consists of sheet metal capable of cold hardening, particularly of aluminium.
14. Closure cap according to claim 15, characterized in that the aluminium sheet metal has a thickness between 160 und 220 microns and a tensile strength between about 120 and 140 Newton/mm2.
15. Closure cap according to claim 1, in which the rip line (27) terminates spaced apart from its commencement location for at least about 140° and wherein the angle defined between a rip line tangent and a plane taken normal to the axis of the cylindrical side wall (12) is always less than 75°, characterized in that the metal band used for producing the closure cap (10) has a thickness between 0.14 and 0.25 mm, preferably between 0.18 and 0.22 mm and, prior to the forming operation, has a tensile strength between 90 and 220 Newton/mm2, preferably between 130 and 180 N/mm2 that the rip line (27) after having reached the upper part of the cylindrical side wall (12) or the transition zone (16) extends always substantially parallel to the lower edge (20) of the side wall (12) and terminates in this side wall (12), preferably spaced apart with respect to the commencing location for about 140° to 180°, and that the rip tab (22) comprises at least one line-shaped strengthening groove (38') the end of which extends to the zone of the cylindrical side wall (12) neighbouring the rip tab (22), and wherein the angle defined between a line taken tangent to the rip line and the plane taken normal to the axis of the cylindrical side wall is preferably always less than 45°
16. Closure cap according to claim 15, characterized in that the rip line (27) extends in a shallow arch from its commencing location (26) near or at the transition of the rip tab contour into the lower edge (20) of the cylindrical side wall (12), upwardly in the direction towards the cover wall (14) and extends from the level of the other end of the rip tab contour always substantially parallel to the lower edge (20).
17.Beverage bottle (62) provided with a closure cap (10) and containing a free space above the beverage in the bottle, the beverage being subjected to effects increasing the interior pressure in this free space, said bottle (62) having a beaded rim (64) at the mouth merging into a groove (68) at the bottle neck, which groove has a diameter substantially less than the outer diameter of the beaded rim (64) onto which the closure cap (10) consisting of thin, bendable sheet metal is sealingly, however detachably, engaged, which closure cap comprises a hollow body member having a circular cover wall (14), a side wall (12) passing over its rounded transition zone (16) into the cover wall (14) and the shape of which follows the contour of the beaded rim (64) by pressing a portion of the side wall (12) against the beaded rim (64) and closely into the groove (68), a sealing member (18) on the inner side of the transition zone (16) and sealingly pressed against at least the axial end of the bottle (62) and to a portion of the side wall (12), and a rip tab (22) extending downwardly from the lower edge (20) of the side wall (12) along the bottle neck and having opposite side edges (48,50) and a free end (25), one (48) of these side edges forming a corner with the lower edge (20) of the side wall (12) as a commencing location (26) for a rip line (27) in the side wall (12), which rip line (27) comprises at least two portions, the first one of which commences at the commencing location (26) and rises from there circumferencially towards the cover wall (14) or passing the second side edge (50) of the rip tab (22), respectively, the second rip line portion (30) being below the cover wall (14) and extending in circumferencial direction of the side wall (12), characterized in that in the rip tab zone at least one groove (38') is provided in the side wall (12) for stabilizing a venting effect at overpressure, said groove extends substantially parallel to the axis of the closure cap and is vaulted outwardly.
18. Bottle provided with a closure cap according to claim 17, characterized in that the rip line (27) passes the groove (38') or intersects it, the angle of intersection being more than 45°
19. Bottle provided with a closure cap according to claim 17 or 18, characterized in that the rip line (27) in the zone of its complete rise is free from intersecting. the groove (38,).
20. Bottle provided with a closure cap according to anyone of claims 17 to 19, characterized in that the groove (38') is formed by the back side of a rib (38) on the outer surface of the side wall (12) or on the rip tab (22), respectively.
21. Bottle provided with a closure cap according to anyone of claims 17 to 20, characterized in that the rip line (27) extends for approximately half of the circumference of the side wall (12).
22. Bottle provided with a closure cap according to anyone of claims 17 to 21, characterized in that the two portions (28,30) of the rip line (27) are connected to each other, the first portion (28) rising towards the second portion (30) terminating within the side wall (12), no one of the two portions reaching the transition zone (16).
23. Bottle provided with a closure cap according to anyone of claims 17 to 22, characterized in that the side wall (12) on its outside is substantially free from corrugations.
24. Bottle provided with a closure cap according to anyone of claims 17 to 23, characterized in that the curvature of the transition zone (16) between the cover wall (14) and the cylindrical side wall (12) is decreased by crimping the side wall (12) to the annular groove (68).
EP82890051A 1981-04-10 1982-04-08 Closure cap for beverage bottles and bottles provided with such a cap Expired EP0064047B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82890051T ATE18169T1 (en) 1981-04-10 1982-04-08 CAP FOR BEVERAGE BOTTLES AND BOTTLE WITH SUCH CAP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3114613 1981-04-10
DE19813114613 DE3114613A1 (en) 1981-04-10 1981-04-10 SEALING CAP FOR CONTAINERS

Publications (2)

Publication Number Publication Date
EP0064047A1 EP0064047A1 (en) 1982-11-03
EP0064047B1 true EP0064047B1 (en) 1986-02-26

Family

ID=6129920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82890051A Expired EP0064047B1 (en) 1981-04-10 1982-04-08 Closure cap for beverage bottles and bottles provided with such a cap

Country Status (11)

Country Link
US (2) US4564116A (en)
EP (1) EP0064047B1 (en)
JP (1) JPS58500519A (en)
AT (1) ATE18169T1 (en)
AU (1) AU550972B2 (en)
BR (1) BR8207581A (en)
CA (1) CA1185205A (en)
DE (2) DE3114613A1 (en)
ES (1) ES273513U (en)
SU (1) SU1205754A3 (en)
WO (1) WO1982003612A1 (en)

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Also Published As

Publication number Publication date
WO1982003612A1 (en) 1982-10-28
CA1185205A (en) 1985-04-09
SU1205754A3 (en) 1986-01-15
JPS58500519A (en) 1983-04-07
US4564116A (en) 1986-01-14
DE3114613A1 (en) 1982-11-04
ATE18169T1 (en) 1986-03-15
AU550972B2 (en) 1986-04-10
DE3269300D1 (en) 1986-04-03
ES273513U (en) 1984-04-01
EP0064047A1 (en) 1982-11-03
US4431111A (en) 1984-02-14
AU8333482A (en) 1982-11-04
BR8207581A (en) 1983-03-29

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