EP0271768B1 - Deep-drawn aluminium screw closure for glass containers under pressure, and deep-drawing device for the manufacture of the top portion of such a closure - Google Patents
Deep-drawn aluminium screw closure for glass containers under pressure, and deep-drawing device for the manufacture of the top portion of such a closure Download PDFInfo
- Publication number
- EP0271768B1 EP0271768B1 EP87117793A EP87117793A EP0271768B1 EP 0271768 B1 EP0271768 B1 EP 0271768B1 EP 87117793 A EP87117793 A EP 87117793A EP 87117793 A EP87117793 A EP 87117793A EP 0271768 B1 EP0271768 B1 EP 0271768B1
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- Prior art keywords
- deep
- closure
- screw
- recess
- mouth
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D51/00—Closures not otherwise provided for
- B65D51/16—Closures not otherwise provided for with means for venting air or gas
- B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
- B65D51/1661—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of a passage for the escape of gas between the closure and the lip of the container mouth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
- B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
- B65D41/0464—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements the screw-thread or the like being formed by conforming the cap-skirt to the thread or the like formation on a container neck
Definitions
- the invention relates to a deep-drawn screw cap made of aluminum for glass bottles under internal pressure with an upper end surface, a lateral threaded surface and optionally a locking ring, wherein a sealing compound is arranged on the inside of the end surface, in particular close to the transition to the threaded surface, by means of which the deformed Sealing is carried out along the edge of the mouth of a glass bottle (such a screw cap is known, for example, from US Pat. No. 4,007,848).
- the invention relates to a deep-drawing device for a closure head for producing rotary closures made of aluminum for glass bottles under internal pressure with a die which can be plugged onto a blank from above and has a plurality of concentric recesses which become smaller from the outside inwards, the first recess being continuous from the outside tapered inside to approximately the largest outside diameter of the screw cap, followed by a second recess with a constant diameter and finally followed by a third recess with a smaller diameter, which is used to deep-draw the blank down to the side mouth of a glass bottle.
- a deep-drawing device for a closure head for producing rotary closures made of aluminum for glass bottles under internal pressure with a die which can be plugged onto a blank from above and has a plurality of concentric recesses which become smaller from the outside inwards, the first recess being continuous from the outside tapered inside to approximately the largest outside diameter of the screw cap, followed by a second recess with a constant diameter and finally followed by a third reces
- liquid-tight screw caps generally known as so-called pilferproof closures or PP caps
- gas-tight screw caps also as GD closures known in practice.
- the former closures are used for so-called still beverages, such as spirits.
- the sealing takes place between the upper end face of the screw cap, which regularly carries the seal, and the upper rim of the mouth of the glass bottle.
- a sufficient contact pressure can be maintained by the effective thread, that is the external thread of the glass bottle in connection with the thread surface of the screw cap created by rolling.
- gas-tight seal rather that system can only be classified as liquid-tight.
- gas-tight screw caps are used in considerable quantities. Serious accidents can occur, even if only sporadically. Depending on the degree of emptying of a glass bottle filled with a carbonated drink and the instantaneous temperature effect, internal pressures can easily build up, which exceed the internal pressure by several times during filling. This can cause the screw cap to lift off and "blow off" the glass bottle. The twist lock can be lifted extremely vehemently, even like a bullet, and is therefore quite dangerous. Still, it has to be called the lesser evil. In such cases, the screw cap is not always the weakest point, but sometimes the glass bottle itself can no longer withstand such internal pressure. This usually leads to an explosive destruction of the glass bottle, which can lead to extremely dangerous injuries if people are present. This has been reported repeatedly in the press.
- Fruit juice bottles with gas-tight screw caps are also a serious source of danger. Although fruit juices are usually filled hot and initially lead to a vacuum; In the case of fruit juices, however, fermentation can also cause an internal pressure to build up. This is all the more remarkable since glass bottles with a smaller wall thickness are often chosen for fruit juices. So there is also a considerable risk of injury there.
- Other twist locks are also known specifically for fruit juices, namely with a circular punch in the middle of the upper end surface, which allows the limited central area to bend downwards as an indicator on the one hand when vacuum and on the other hand at an impermissibly high internal pressure along the punching line (as a predetermined breaking point ) to burst.
- these options do not apply if, in practice - as already mentioned, for reasons of cost - carbonated drinks and fruit juices are treated equally, i.e. be filled with the same machine without changes.
- the invention has set itself the task of turning a twist lock of the type mentioned teroul that the sealing effect is certainly lost when higher internal pressures are exceeded. This should no longer allow impermissible internal pressures to build up. This should also apply to twist-off closures with the circlips that are common today, which have so far favored the twist-off closure to remain in place and thus an impermissible pressure build-up on glass bottles that have not yet been opened.
- At least one partial area at the transition from the end surface to the threaded surface is not deep-drawn down to the lateral mouth edge, but is rather excluded from such a deformation.
- the invention is based on the knowledge that the deep-drawing of the transition area between the upper end face and the lateral thread surface certainly produces a high increase in tightness.
- the usual deformation for this only allows the twist lock to act as a uniform sealing element.
- the invention with its different shape now creates a local area of relatively low resistance and thus less tightness, which, if necessary, has the desired safety function.
- it is a safety function similar to a safety valve.
- the invention therefore proposes a new shape which allows blowing off at a defined point without the overall locking device having to be lifted off or larger areas thereof being deformed.
- the ratio of the proposed undeformed partial area to the remaining area deformed in a known manner remains individual, depending on the glass thickness, filling material and other criteria determine. Suitable values can be determined empirically easily and reliably.
- the length of the partial areas should count according to millimeters, for example between 3 and 7 mm. It is also advantageous if the subregions are arranged in a uniform distribution along the lateral edge of the mouth. With the aforementioned measures, the somewhat opposite demands for high tightness and timely blowing can be reliably coordinated.
- the invention proposes that the third recess have at least one partial extension aligned parallel to the central axis up to approximately the diameter of the second recess. Furthermore, several extensions should be provided and the extensions should be evenly distributed around the central axis. Finally, an advantageous further development is characterized in that the extensions have an approximately semicircular cross section with a rounded outlet area in plan view.
- the proposed deep-drawing device can easily be used instead of known deep-drawing devices in the closing heads of existing machines. It allows the desired twist locks to be manufactured quickly and effortlessly. It goes without saying that a stop (abutment) which can be pressed in against a spring or the like can be used in the third recess, in particular also a stop provided with an additional stylus, corresponding to the known so-called safety plungers.
- a twist lock made of aluminum has an upper end face 1, a side threaded surface 2 and a locking ring 3.
- the upper end surface 1 is essentially flat and undeformed, the lateral thread surface 2 corresponds to the external thread 4 at the mouth of the glass bottle to be closed, whereby it is brought into this shape by rolling, and the locking ring 3 is flanged inwards as a kind of collar .
- the end face 1 On its inside, the end face 1 has a sealing compound 5, which extends to the inside of the threaded surface 2.
- a deep-drawing device has a die 9 with recesses 10, 11 and 12, which are arranged concentrically around a central axis 13 and become smaller from the outside inwards.
- the first recess 10 tapers continuously down to approximately the largest outside diameter of the twist lock to be produced.
- the second recess 11 with an approximately constant diameter.
- the third recess 12 is stepped, ie it has a smaller diameter, but which is also essentially constant.
- the third recess 12 has partial extensions 14 aligned parallel to the central axis 13. These extend up to approximately the diameter of the second recess 11.
- four extensions 14 are arranged evenly distributed around the central axis 13. In plan view, they have an approximately semicircular cross section with rounded outlet areas 15.
- a stop (abutment) 16 is held displaceably, which can be pressed against the force of a compression spring 17 into the interior of the die 9.
- the deep-drawing device described above can be used in conventional closing heads of automatic filling machines. It is moved from above onto a blank closure and causes the transition area between the upper end face and the lateral threaded surface to be deformed, with the exception of short partial areas which remain undeformed, in accordance with the extensions 14.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Abstract
Description
Die Erfindung betrifft einen tiefgezogenen Drehverschluß aus Aluminium für unter Innendruck stehende Glasflaschen mit einer oberen Abschlußfläche, einer seitlichen Gewindefläche sowie gegebenenfalls einem Sicherungsring, wobei auf der Innenseite der Abschlußfläche, insbesondere nahe am Übergang zur Gewindefläche, eine Dichtmasse angeordnet ist, mittels der beim fertig verformten Verschluß eine Abdichtung entlang des Mündungsrandes einer Glasflasche erfolgt (ein solcher Drehverschluß ist zum Beispiel aus der US-A 4 007 848 bekannt). Ferner betrifft die Erfindung eine Tiefziehvorrichtung für einen Verschließkopf zum Herstellen von Drehverschlüssen aus Aluminium für unter Innendruck stehende Glasflaschen mit einer von oben auf einen Rohling aufsteckbaren Matrize mit mehreren konzentrischen, von außen nach innen kleiner werdenden Ausnehmungen, wobei sich die erste Ausnehmung kontinuierlich von außen nach innen bis etwa auf den größten Außendurchmesser des Drehverschlusses verjüngt, sich daran eine zweite Ausnehmung mit konstantem Durchmesser anschließt und darauf schließlich eine dritte Ausnehmung mit einem kleineren Durchmesser folgt, welche dem Tiefziehen des Rohlings bis auf den seitlichen Mündungsrand einer Glasflasche dient. Eine solche Vorrichtung ist allgemein bekannt.The invention relates to a deep-drawn screw cap made of aluminum for glass bottles under internal pressure with an upper end surface, a lateral threaded surface and optionally a locking ring, wherein a sealing compound is arranged on the inside of the end surface, in particular close to the transition to the threaded surface, by means of which the deformed Sealing is carried out along the edge of the mouth of a glass bottle (such a screw cap is known, for example, from US Pat. No. 4,007,848). Furthermore, the invention relates to a deep-drawing device for a closure head for producing rotary closures made of aluminum for glass bottles under internal pressure with a die which can be plugged onto a blank from above and has a plurality of concentric recesses which become smaller from the outside inwards, the first recess being continuous from the outside tapered inside to approximately the largest outside diameter of the screw cap, followed by a second recess with a constant diameter and finally followed by a third recess with a smaller diameter, which is used to deep-draw the blank down to the side mouth of a glass bottle. Such a device is generally known.
Bei der Verschlußtechnik von Glasflaschen mit einem Außengewinde an der Mündung sind grundsätzlich zwei Arten von Drehverschlüssen zu unterscheiden, nämlich zum einen flüssigkeitsdichte Drehverschlüsse, im allgemeinen als sogenannte Pilferproof-Verschlüsse oder unter der Abkürung PP-Verschlüsse bekannt, und zum anderen Gasdichte Drehverschlüsse, auch als GD-Verschlüsse in der Praxis bekannt. Die erstgenannten Verschlüsse kommen bei sogenannten stillen Getränken, wie beispielsweise Spirituosen zur Anwendung. Bei dieser Art Verschluß erfolgt die Abdichtung zwischen der oberen Abschlußfläche des Drehverschlusses, welche regelmäßig die Dichtung trägt, und dem oberen Mündungsrand der Glasflasche. Durch das wirksame Gewinde, das ist das Außengewinde der Glasflasche in Verbindung mit der durch Anrollen erzeugten Gewindefläche des Drehverschlusses, kann eine ausreichender Anpreßdruck aufrechterhalten werden. Allerdings kommt es nicht zu einem gasdichten Abschluß, vielmehr ist jenes System lediglich als flüssigkeitsdicht einzustufen.When it comes to the closure technology of glass bottles with an external thread at the mouth, two types of screw caps are to be differentiated, namely liquid-tight screw caps, generally known as so-called pilferproof closures or PP caps, and gas-tight screw caps, also as GD closures known in practice. The former closures are used for so-called still beverages, such as spirits. In this type of closure, the sealing takes place between the upper end face of the screw cap, which regularly carries the seal, and the upper rim of the mouth of the glass bottle. A sufficient contact pressure can be maintained by the effective thread, that is the external thread of the glass bottle in connection with the thread surface of the screw cap created by rolling. However, there is no gas-tight seal, rather that system can only be classified as liquid-tight.
Solche Verschlüsse sind deshalb ungeeignet für kohlensäurehaltige Getränke. Diese werden in der Regel unter einem Druck von mehreren bar, z. B. 4 - 6 bar, abgefüllt. Hierfür bedarf es dann der gasdichten Drehverschlüsse, bei denen durch Tiefziehen des Übergangsbereichs zwischen der oberen Abschlüßfläche und der seitlichen Gewindefläche des Drehverschlusses auf den seitlichen Mündungsrand der Glassflasche eine zusätzliche Abdichtung erfolgt. Dieses System kann als äußerst dicht und druckbeständig bezeichnet werden. Angesichts der zahlreichen kohlensäurehaltigen Getränke, welche so abgefüllt werden, und der grundsätzlichen Eignung, auch Fruchtsäfte nach diesem System abzufüllen, das heißt zu verschließen, wendet man aus Gründen der Wirtschaftlichkeit (zur Vermeidung weiterer Werkzeugkosten und Umrüstarbeiten) diese Technik meist unverändert auch bei Fruchtsäften an.Such closures are therefore unsuitable for carbonated drinks. These are usually under a pressure of several bar, for. B. 4 - 6 bar. This requires the gas-tight screw caps, in which an additional seal is made by deep-drawing the transition area between the upper sealing surface and the lateral threaded surface of the screw cap on the lateral mouth edge of the glass bottle. This system can be described as extremely tight and pressure-resistant. In view of the numerous carbonated beverages that are filled in this way and the basic suitability of also filling fruit juices according to this system, i.e. closing them, for reasons of economy (to avoid additional tool costs and retrofitting work) this technique is mostly used unchanged for fruit juices .
Wie ersichtlich, kommen jedenfalls gasdichte Drehverschlüsse in ganz erheblichen Stückzahlen zur Anwendung. Dabei können - wenn auch nur vereinzelt -folgenschwere Störfälle auftreten. Je nach Entleerungsgrad einer mit einem kohlensäurehaltigen Getränk abgefüllten Glasflasche und der augenblicklichen Temperatureinwirkung können sich leicht Innendrücke aufbauen, welche den Innendruck beim Abfüllen um ein Mehrfaches übersteigen. Das kann dazu führen, daß sich der Drehverschluß abhebt und die Glasflasche "abbläst". Das Abheben des Drehverschlusses kann äußerst vehement, ja geschoßartig, erfolgen und ist deshalb recht gefährlich. Trotzdem muß man es noch als das kleinere Übel bezeichnen. Nicht immer stellt nämlich der Drehverschluß in solchen Fällen die schwächste Stelle dar, vielmehr hält bisweilen auch die Glasflasche selbst solchem Innendruck nicht mehr stand. Es kommt dann meist zu einer explosionsartigen Zerstörung der Glasflasche, was zu äußerst gefährlichen Verletzungen führen kann, falls Menschen zugegen sind. Darüber wurde schon wiederholt in der Presse berichtet.As can be seen, gas-tight screw caps are used in considerable quantities. Serious accidents can occur, even if only sporadically. Depending on the degree of emptying of a glass bottle filled with a carbonated drink and the instantaneous temperature effect, internal pressures can easily build up, which exceed the internal pressure by several times during filling. This can cause the screw cap to lift off and "blow off" the glass bottle. The twist lock can be lifted extremely vehemently, even like a bullet, and is therefore quite dangerous. Still, it has to be called the lesser evil. In such cases, the screw cap is not always the weakest point, but sometimes the glass bottle itself can no longer withstand such internal pressure. This usually leads to an explosive destruction of the glass bottle, which can lead to extremely dangerous injuries if people are present. This has been reported repeatedly in the press.
Aber auch mit gasdichten Drehverschlüssen versehene Fruchtsaftflaschen stellen eine ernstzunehmende Gefahrenquelle dar. Zwar werden Fruchtsäfte in der Regel heiß abgefüllt und führen zunächst zu einem Vakuum; bei Fruchtsäften kann sich jedoch durch eintretende Gärung umgekehrt auch ein Innendruck aufbauen. Dies ist um so beachtlicher, als für Fruchtsäfte vielfach Glasflaschen geringerer Wandstärke gewählt werden. Es besteht also auch dort eine erhebliche Verletzungsgefahr. - Speziell für Fruchtsäfte sind zwar auch andere Drehverschlüsse bekannt, nämlich mit einer kreisförmigen Stanzung inmitten der oberen Abschlußfläche, welche der so begrenzten Mittelfläche erlaubt, sich einerseits bei Vakuum als Indikator nach unten durchzubiegen und andererseits bei einem unzulässig hohen Innendruck entlang der Stanzlinie (als Sollbruchstelle) abzubersten. Diese Möglichkeiten greifen jedoch nicht, wenn in der Praxis - wie bereits gesagt, aus Kostengründen - kohlensäurehaltige Getränke und Fruchtsäfte gleich behandelt werden, d.h. ohne Veränderungen mit denselben Automaten abgefüllt werden.Fruit juice bottles with gas-tight screw caps are also a serious source of danger. Although fruit juices are usually filled hot and initially lead to a vacuum; In the case of fruit juices, however, fermentation can also cause an internal pressure to build up. This is all the more remarkable since glass bottles with a smaller wall thickness are often chosen for fruit juices. So there is also a considerable risk of injury there. - Other twist locks are also known specifically for fruit juices, namely with a circular punch in the middle of the upper end surface, which allows the limited central area to bend downwards as an indicator on the one hand when vacuum and on the other hand at an impermissibly high internal pressure along the punching line (as a predetermined breaking point ) to burst. However, these options do not apply if, in practice - as already mentioned, for reasons of cost - carbonated drinks and fruit juices are treated equally, i.e. be filled with the same machine without changes.
Angesichts dieser Praxis und der damit verbundenen Nachteile und insbesondere Gefahren hat sich die Erfindung zur Aufgabe gesetzt, einen Drehverschluß der eingangs genannten Art so weiterzubilden, daß bei Überschreiten höherer Innendrücke die Dichtwirkung mit Sicherheit verlorengeht. Es sollen sich dadurch keine unzulässigen Innendrücke mehr aufbauen können. Dies soll auch für Drehverschlüsse mit den heute üblichen Sicherungsringen gelten, welche bei noch ungeöffneten Glasflaschen ein Verharren des Drehverschlusses und damit einen unzulässigen Druckaufbau bisher noch begünstigen.In view of this practice and the associated disadvantages and particular dangers, the invention has set itself the task of turning a twist lock of the type mentioned terbildung that the sealing effect is certainly lost when higher internal pressures are exceeded. This should no longer allow impermissible internal pressures to build up. This should also apply to twist-off closures with the circlips that are common today, which have so far favored the twist-off closure to remain in place and thus an impermissible pressure build-up on glass bottles that have not yet been opened.
Gelöst wird diese Aufgabe erfindungsgemäß dadurch, daß mindestens ein Teilbereich am Übergang von der Abschlußfläche zur Gewindefläche nicht bis auf den seitlichen Mündungsrand tiefgezogen ist, vielmehr von einer derartigen Verformung ausgenommen ist.This object is achieved according to the invention in that at least one partial area at the transition from the end surface to the threaded surface is not deep-drawn down to the lateral mouth edge, but is rather excluded from such a deformation.
Der Erfindung liegt die Erkenntnis zugrunde, daß das Tiefziehen des Übergangsbereiches zwischen oberer Abschlußfläche und seitlicher Gewindefläche sicherliche einen hohen Zuwachs an Dichtigkeit erbringt. Die dafür übliche Verformung läßt jedoch den Drehverschluß nur noch als einheitliches Dichtelement wirken. Demgegenüber schafft die Erfindung mit ihrer abweichenden Formgebung jetzt einen lokalen Bereich relativ geringen Widerstandes und damit geringerer Dichtigkeit, dem im Bedarfsfalle die gewünschte Sicherheitsfunktion zukommt. Angesichts der örtlich begrenzten Veränderungen und Wirkungen könnte man auch sagen, daß es sich um eine Sicherheitsfunktion ähnlich einem Sicherheitsventil handelt. Hat das Gas einmal die im unverformten Teilbereich verminderte Dichtstrecke überwunden, kann es ungehindert über die im übrigen durchlässigen Gewindegänge wie auch den Sicherungsring aus dem Drehverschluß austreten. Es spielt dabei keine Rolle mehr, ob der Drehverschluß überhaupt mit einem Sicherungsring versehen ist oder nicht.The invention is based on the knowledge that the deep-drawing of the transition area between the upper end face and the lateral thread surface certainly produces a high increase in tightness. The usual deformation for this, however, only allows the twist lock to act as a uniform sealing element. In contrast, the invention with its different shape now creates a local area of relatively low resistance and thus less tightness, which, if necessary, has the desired safety function. In view of the local changes and effects, one could also say that it is a safety function similar to a safety valve. Once the gas has overcome the reduced sealing distance in the undeformed section, it can emerge unhindered from the twist lock via the otherwise permeable threads as well as the locking ring. It no longer matters whether the rotary lock is provided with a locking ring or not.
Wie ersichtlich, schlägt die Erfindung also eine neue Formgebung vor, welche an definierter Stelle ein Abblasen erlaubt, ohne daß es zu einem Abheben des Drehverschlusses insgesamt oder einer Verformung größerer Bereiche desselben mehr kommen muß. Je grösser der unverformte Teilbereich gewählt wird, desto echer kann mit einem Abblasen gerechnet werden. Da jedoch in der Regel nicht nur die Bedingung eines sicheren Abblassens zu erfüllen ist, sondern zunächst einmal einer ausreichenden Dichtwirkung, bleibt das Verhältnis von dem vorgeschlagenen unverformten Teilbereich zu dem übrigen in bekannter Weise verformten Bereich je nach Glasstärke, Füllgut wie auch sonstigen Kriterien individuell zu bestimmen. Geeignete Werte lassen sich leicht und zuverlässig empirisch ermitteln.As can be seen, the invention therefore proposes a new shape which allows blowing off at a defined point without the overall locking device having to be lifted off or larger areas thereof being deformed. The larger the undeformed sub-area is selected, the more a blow-off can be expected. However, since, as a rule, not only the condition of a safe blow-off has to be fulfilled, but first of all a sufficient sealing effect, the ratio of the proposed undeformed partial area to the remaining area deformed in a known manner remains individual, depending on the glass thickness, filling material and other criteria determine. Suitable values can be determined empirically easily and reliably.
Besser, als einen einzigen längeren unverformten Teilbereich vorzugsehen, ist es, gegebenenfalls mehrere entsprechend kürzere Teilbereiche zu wählen. Die Länge der Teilbereiche sollte dabei nach Millimetern zählen, beispielsweise zwischen 3 und 7 mm liegen. Auch ist es von Vorteil, wenn die Teilbereiche in gleichmäßiger Verteilung entlang dem seitlichen Mündungsrand angeordnet sind. Mit den vorgenannten Maßnahmen lassen sich die in gewisser Weise entgegengesetzten Forderungen nach hoher Dichtigkeit und rechtzeitigem Abblasen verläßlich aufeinander abstimmen.It is better than providing a single longer undeformed partial area, if necessary, to select several correspondingly shorter partial areas. The length of the partial areas should count according to millimeters, for example between 3 and 7 mm. It is also advantageous if the subregions are arranged in a uniform distribution along the lateral edge of the mouth. With the aforementioned measures, the somewhat opposite demands for high tightness and timely blowing can be reliably coordinated.
Für eine Tiefziehvorrichtung der eingangs genannten Art schlägt die Erfindung vor, daß die dritte Ausnehmung mindestens eine parallel zur Mittelachse ausgerichtete partielle Erweiterung bis etwa zum Durchmesser der zweiten Ausnehmung aufweist. Ferner sollen mehrere Erweiterungen vorgesehen und die Erweiterungen gleichmäßig um die Mittelachse verteilt angeordnet sein. Schließlich ist eine vorteilhafte Weiterbildung dadurch gekennzeichnet, daß die Erweiterungen in Draufsicht einen etwa halbkreisförmigen Querschnitt mit abgerundeten Auslaufbereichen aufweisen.For a deep-drawing device of the type mentioned at the outset, the invention proposes that the third recess have at least one partial extension aligned parallel to the central axis up to approximately the diameter of the second recess. Furthermore, several extensions should be provided and the extensions should be evenly distributed around the central axis. Finally, an advantageous further development is characterized in that the extensions have an approximately semicircular cross section with a rounded outlet area in plan view.
Die vorgeschlagene Tiefziehvorrichtung läßt sich ohne weiteres anstelle bekannter Tiefziehvorrichtungen in den Verschließköpfen bestehender Automaten verwenden. Sie erlaubt eine rasche und kraftschonende Herstellung der gewünschten Drehverschlüsse. Es versteht sich, daß dabei in der dritten Ausnehmung ein entgegen einer Feder o. dgl. eindrückbarer Anschlag (Widerlager) Verwendung finden kann, insbesondere auch ein mit einem zusätzlichen Taststift versehener Anschlag, entsprechend den bekannten sogenannten Sicherheits-Plungern.The proposed deep-drawing device can easily be used instead of known deep-drawing devices in the closing heads of existing machines. It allows the desired twist locks to be manufactured quickly and effortlessly. It goes without saying that a stop (abutment) which can be pressed in against a spring or the like can be used in the third recess, in particular also a stop provided with an additional stylus, corresponding to the known so-called safety plungers.
Die Erfindung wird nachstehend anhand der Zeichnung für bevorzugte Ausführungsbeispiele weiter beschrieben. Darin zeigen:
- Fig. 1 einen erfindungsgemäßen Drehverschluß in Draufsicht,
- Fig. 2 den Gegenstand von Fig. 1 ohne Riffelung im Schnitt entlang der Linie lrJ"1I sowie, darin eingeblendet, die Mündung einer" Gtäsfiasche mit ihrem Außengewinde in Seitenansicht,
- Fig. 3. den unteren Teil einer erfindungsgemäßen Tiefziehvorrichtung im Längsschnitt und
- Fig. 4 den Gegenstand von Fig. 3 in Unteransicht.
- 1 is a top view of a twist lock according to the invention,
- 2 shows the object of FIG. 1 without corrugation in a section along the line LRJ "1I and, superimposed therein, the mouth of a" glass bottle with its external thread in a side view,
- Fig. 3. the lower part of a deep-drawing device according to the invention in longitudinal section and
- Fig. 4 shows the subject of Fig. 3 in bottom view.
Nach den Fig. 1 und 2 weist ein Drehverschluß aus Aluminium eine obere Abschlußfläche 1, eine seitliche Gewindefläche 2 sowie einen Sicherungsring 3 auf. Die obere Abschlußfläche 1 ist dabei im wesentlichen flach und unverformt, die seitliche Gewindefläche 2 entspricht dem Außengewinde 4 an der Mündung der zu verschließenden Glasflasche, wobei sie durch Anrollen in diese Form gebracht ist, und der Sicherungsring 3 ist als eine Art Kragen nach innen gebördelt. An ihrer Innenseite weist die Abschlußfläche 1 eine Dichtmasse 5 auf, welche sich bis zur Innenseite der Gewindefläche 2 erstreckt.1 and 2, a twist lock made of aluminum has an
Wie ersichtlich, ist zunächst eine Abdichtung zwischen der Abschlußfläche 1 und dem oberen Mündungsrand 6 der Glasflasche gegeben. Soweit der Übergangsbereich zwischen oberer Abschlußfläche 1 und seitlicher Gewindefläche 2 mit Anpreßdruck in Richtung auf den seitlichen Mündungsrand 7 der Glasflasche tiefgezogen ist, besteht dort eine zusätzliche Dichtwirkung. Diese ist jedoch dort unterbrochen, wo Teilbereiche 8 nach dem Vorschlag der Erfindung unverformt geblieben sind. Im vorliegenden Falle handelt es sich um vier Teilbereiche, welche gleichmäßig über den Umfang des Drehverschlusses verteilt sind und in natura jeweils unter 1 cm an Länge messen. Bestimmungsgemäß kommt es in einem oder mehreren dieser Bereiche zum Gasaustritt und Druckabbau, falls der Innendruck in der Glasflasche auf gefährliche Werte anwachsen sollte. So kann einer unkontrollierten Zerstörung mit Sach- und vor allem Gesundheitsschäden rechtzeitig entgegengewirkt werden. Wie aus den Fig. 3 und 4 weiter ersichtlich, besitzt eine Tiefziehvorrichtung eine Matrize 9 mit Ausnehmungen 10, 11 und 12, welche konzentrisch um eine Mittelachse 13 angeordnet sind und von außen nach innen kleiner werden. So verjüngt sich die erste Ausnehmung 10 kontinuierlich bis etwa auf den größten Außendurchmesser des herzustellenden Drehverschlusses. Daran schließt sich unmittelbar die zweite Ausnehmung 11 mit etwa konstantem Durchmesser an. Dagegen ist die dritte Ausnehmung 12 abgestuft, d. h. sie besitzt einen kleineren Durchmesser, der aber auch im wesentlichen konstant ist.As can be seen, there is initially a seal between the
Erfindungsgemäß weist die dritte Ausnehmung 12 parallel zur Mittelachse 13 ausgerichtete partielle Erweiterungen 14 auf. Diese reichen bis etwa zum Durchmesser der zweiten Ausnehmung 11. Im vorliegenden Ausführungsbeispiel sind vier Erweiterungen 14 gleichmäßig um die Mittelachse 13 verteilt angeordnet. In Draufsicht besitzen sie einen etwa halbkreisförmigen Querschnitt mit abgerundeten Auslaufbereichen 15. Im Innern der dritten Ausnehmung 12 ist im übrigen ein Anschlag (Widerlager) 16 verschieblich gehalten, welcher entgegen der Kraft einer Druckfeder 17 ins Innere der Matrize 9 eingedrückt werden kann.According to the invention, the
Die vorbeschriebene Tiefziehvorrichtung kann in üblichen Verschließköpfen von Abfüllautomaten Verwendung finden. Sie wird dabei von oben auf einen Verschluß-Rohling aufgefahren und bewirkt eine Verformung des Ubergangsbereiches zwischen oberer Abschlußfläche und seitlicher Gewindefläche unter Aussparung von kurzen Teilbereichen, welche unverformt bleiben, entsprechend den Erweiterungen 14.The deep-drawing device described above can be used in conventional closing heads of automatic filling machines. It is moved from above onto a blank closure and causes the transition area between the upper end face and the lateral threaded surface to be deformed, with the exception of short partial areas which remain undeformed, in accordance with the
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87117793T ATE58350T1 (en) | 1986-12-17 | 1987-12-02 | DEEP-DRAWN ROTARY CAP MADE OF ALUMINUM FOR INTERNALLY PRESSURED GLASS BOTTLES AND DEEP-DRAWING DEVICE FOR A CLOSING HEAD FOR MANUFACTURING SUCH ROTARY CAPS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3642998A DE3642998C1 (en) | 1986-12-17 | 1986-12-17 | Deep-drawn aluminum screw cap for glass bottles under internal pressure and deep-drawing device for a closure head for the manufacture of such screw caps |
DE3642998 | 1986-12-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0271768A1 EP0271768A1 (en) | 1988-06-22 |
EP0271768B1 true EP0271768B1 (en) | 1990-11-14 |
Family
ID=6316335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87117793A Expired - Lifetime EP0271768B1 (en) | 1986-12-17 | 1987-12-02 | Deep-drawn aluminium screw closure for glass containers under pressure, and deep-drawing device for the manufacture of the top portion of such a closure |
Country Status (6)
Country | Link |
---|---|
US (1) | US4844271A (en) |
EP (1) | EP0271768B1 (en) |
JP (1) | JPS63162466A (en) |
AT (1) | ATE58350T1 (en) |
DE (2) | DE3642998C1 (en) |
ES (1) | ES2018671B3 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3905017A1 (en) * | 1989-02-18 | 1990-08-23 | Wilhelm Goetz | Closure for bottles and similar containers |
DE3939783A1 (en) * | 1989-12-01 | 1991-06-06 | Henri Haist | DEEP-TURNED LOCKING CAP FROM ALUMINUM FOR GLASS BOTTLES UNDER PRESSURE AND THERMOFLOWING DEVICE FOR A LOCKING HEAD FOR THE PRODUCTION OF SUCH LATHE CAPS |
EP0620164B1 (en) * | 1990-07-12 | 1996-07-31 | Michael Dr. Hertrampf | Method for producing a closure for bottles or the like |
DE9305416U1 (en) * | 1993-04-09 | 1993-12-23 | Metallwaren-Fabrik GmbH, 42499 Hückeswagen | Safety lock for containers |
DE4439464C1 (en) | 1994-11-07 | 1996-05-15 | Haist Verpackung Beratung | Containers, in particular bottles for liquids that may be under pressure |
ATE236053T1 (en) * | 1997-06-18 | 2003-04-15 | Alcoa Gmbh Verpackwerke | CONTAINER CLOSURE AND DEVICE FOR PRODUCING SAME |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1381365A (en) * | 1920-07-08 | 1921-06-14 | Taliaferro Thomas Lucien | Bottle-cap and method of sealing bottles |
GB256326A (en) * | 1925-05-07 | 1926-08-09 | Senzo Oyama | Improvements in caps or closures for bottles |
US2456607A (en) * | 1946-08-14 | 1948-12-14 | Shaffer Stewart | Liner lid for containers |
DE1432224A1 (en) * | 1962-07-23 | 1968-11-21 | Patton Franklin Seville | Vent seal for a closure |
GB1224733A (en) * | 1967-03-31 | 1971-03-10 | Kork N Seal Ltd | Container closures with sealing liners |
US4007851A (en) * | 1975-05-09 | 1977-02-15 | Zapata Industries, Inc. | Anti-missiling bottle closure |
US4007848A (en) * | 1975-05-09 | 1977-02-15 | Zapata Industries, Inc. | Anti-missiling bottle structure |
DE2902859A1 (en) * | 1978-02-06 | 1979-08-16 | Albert Obrist | LOCKING ARRANGEMENT FOR CONTAINERS, IN PARTICULAR FOR BOTTLES |
DE2829755A1 (en) * | 1978-07-06 | 1980-01-17 | Crown Cork Belgium | Gas-tight screw closure cap for bottles - is tightened by axial deformation of cap end and thread flanks |
JPS5768353A (en) * | 1980-10-17 | 1982-04-26 | Crown Cork Japan | Vessel cover having vessel explosion preventive characteristic |
US4466548A (en) * | 1982-09-30 | 1984-08-21 | Metal Closures Limited | Container and closure and method for applying a closure to a container |
-
1986
- 1986-12-17 DE DE3642998A patent/DE3642998C1/en not_active Expired
-
1987
- 1987-12-02 EP EP87117793A patent/EP0271768B1/en not_active Expired - Lifetime
- 1987-12-02 ES ES87117793T patent/ES2018671B3/en not_active Expired - Lifetime
- 1987-12-02 AT AT87117793T patent/ATE58350T1/en not_active IP Right Cessation
- 1987-12-02 DE DE8787117793T patent/DE3766231D1/en not_active Expired - Fee Related
- 1987-12-10 US US07/131,229 patent/US4844271A/en not_active Expired - Fee Related
- 1987-12-17 JP JP62317639A patent/JPS63162466A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS63162466A (en) | 1988-07-06 |
ES2018671B3 (en) | 1991-05-01 |
DE3766231D1 (en) | 1990-12-20 |
US4844271A (en) | 1989-07-04 |
EP0271768A1 (en) | 1988-06-22 |
ATE58350T1 (en) | 1990-11-15 |
DE3642998C1 (en) | 1988-05-19 |
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