EP0081145B1 - End closure for a hollow cylindrical extrusion pressure container - Google Patents

End closure for a hollow cylindrical extrusion pressure container Download PDF

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Publication number
EP0081145B1
EP0081145B1 EP82110865A EP82110865A EP0081145B1 EP 0081145 B1 EP0081145 B1 EP 0081145B1 EP 82110865 A EP82110865 A EP 82110865A EP 82110865 A EP82110865 A EP 82110865A EP 0081145 B1 EP0081145 B1 EP 0081145B1
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EP
European Patent Office
Prior art keywords
container
closure
bottom closure
extrusion
cover member
Prior art date
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Expired
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EP82110865A
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German (de)
French (fr)
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EP0081145A1 (en
Inventor
Gert Langensiepen
Werner Brüning
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Alfred Fischbach KG Kunststoff Spritzgusswerk
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Alfred Fischbach KG Kunststoff Spritzgusswerk
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Application filed by Alfred Fischbach KG Kunststoff Spritzgusswerk filed Critical Alfred Fischbach KG Kunststoff Spritzgusswerk
Priority to AT82110865T priority Critical patent/ATE15354T1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
    • B05C17/00579—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container comprising means for allowing entrapped air to escape to the atmosphere
    • 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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0005—Containers or packages provided with a piston or with a movable bottom or partition having approximately the same section as the container

Definitions

  • the invention relates to a bottom closure made of elastic plastic, serving as an ejection piston for viscous plastic masses, for a hollow cylindrical extrusion container, in particular for a cartridge, with a closure plate directed towards the storage space of the extrusion container and a hollow piston section extending to the filling opening of the extrusion container and guided on the inner wall thereof on the storage compartment side of the lock actuator, a cover element which is at least approximately shaped according to the contour of the lock actuator and is made of an elastic material that differs from the plastic of the rest of the bottom lock is applied, which overlaps the outer edge of the lock actuator.
  • Bottom closures serving as push-out pistons are known in various configurations (e.g. DE-PS No. 2034047, DE-OS No. 3005855, EP-A No. 0004100).
  • Such bottom closures are made of the most elastic plastic possible to achieve the elasticity required for the overall function of the bottom closure, e.g. B. made of polyethylene or polypropylene.
  • B. made of polyethylene or polypropylene.
  • a locking piston is known, which is comparable to an ejection piston of the type specified at the outset.
  • An inner piston made of a stiffer material is completely coated on the outside with a softer plastic coating, which lies against the container wall via sealing lips.
  • the so-called locking plate or bottom used in this locking piston is concavely curved away from the storage space of the container.
  • This known piston cannot perform the necessary functions described: due to the concave curvature of the lock actuator, air pockets are favored and cannot be removed. If the piston is pressurized against the mass, the locking plate bulges forward towards the mass, so that the outer edge of the locking plate, including the outer soft plastic coating, is drawn inwards, so that the sealing and stripping functions are significantly impaired or .
  • the known piston lacks the gas diffusion tightness described, since any additional sealing of the closure actuator is missing both on its surface and in its function at its edge.
  • the soft outer plastic coating cannot achieve such diffusion tightness.
  • the invention has for its object to achieve by a further embodiment of the bottom closure of the type specified that on the one hand the described functions of the piston are completely fulfilled and in particular the elasticity required for the functionality of the bottom closure is guaranteed and on the other hand to the storage room of the extruded container the required stability and diffusion tightness are ensured.
  • the aim is to achieve a simple design that is favorable for plastic molding. All in all, the universal use of the base closure should be made possible as far as possible, even for masses that release aggressive or volatile components, as well as use with different types of loading of the base closure in its function as a push-out piston.
  • cover element is made of a more rigid material than that of the stock space of the extruded container is convexly curved locking plate and the hollow piston section and snaps behind the complementarily shaped outer locking plate edge with a circumferential outer edge and engages behind the remaining hollow piston section at least one elastic sealing lip formed from its material and surrounding its outer wall and arranged against the inner wall of the container.
  • the cover element and the rest of the bottom closure with the locking plate, hollow piston section and sealing lip or lips can be molded as simple components from the respective material or plastic, in particular in the case of plastic, and can be simply and simply placed on the locking plate by the cover element easy to connect securely.
  • the cover element can be made of a suitable plastic or a suitable metallic material, e.g. B. made of aluminum or alloy.
  • the bottom closure designed according to the invention can be provided in its other forms on the inside of the closure plate with the ring stop and the projecting ring lip according to DE-PS No. 2034047 and with the sealing lips designed according to DE-OS No. 3005855. If the bottom lock is actuated as a push-out piston with a mechanical piston, the outer edge of the cover element takes over the effect of the front drawer lip, that is to say the stripping and sealing effect. If a pressure medium acts on the bottom closure as a push-out piston, the sealing lip or the sealing lips on the circumference of the hollow piston section take over the necessary sealing.
  • a high elasticity of the rest of the bottom closure can be selected in order to ensure the functions described, and due to its rigidity the cover element can be used as a securely closing and stripping front element of the bottom closure and thus of the push-out piston. If, when using the extrusion container after a previous application of the bottom closure as a push-out piston, this exposure is interrupted, after removing the actuation pressure from the bottom closure, this pressure, which may build up in the extrusion container, can be relieved by retreating the more elastic bottom closure part with a stiffer cover element, so that disadvantageous after-running is avoided by mass.
  • the usability of the bottom closure is significantly promoted by the invention and, in particular when all the functions described are fulfilled, a secure seal corresponding to the properties of the enclosed mass to the storage space of the extruded container is achieved, in the manner described practically independently of the design of the bottom closure for the rest the material or plastic of the cover element can be selected according to the respective requirements of the enclosed mass.
  • the cover element is made of polyamide and the rest of the bottom closure, that is to say the closure plate and the hollow piston section with its sealing lip or lips, are formed from polyethylene or polypropylene.
  • the polyamide of the cover element has a high chemical resistance and in particular a high gas diffusion tightness, while the polyethylene or polypropylene ensures the high, functional elasticity of the rest of the bottom closure.
  • the bottom closure shown in the drawing has a closure plate 1 directed towards the storage space of the extruded container and bulging in this direction, as well as a hollow piston section 2 which extends to the filling opening of the extruded container and which, as can be seen in FIGS. 3 and 4, on the inner wall of the extruded container 3 is led.
  • the outer wall surrounding elastic sealing lips 4 are also provided, which are shaped according to the design according to DE-OS No. 3005855.
  • annular lip 5 protruding toward the open side of the hollow piston section is arranged within the hollow piston section 2 and immediately following the inner wall of the locking plate 1, and the Verschiussteiier carries on its inner wall of the hollow piston section 2 a ring stop 6 which is set back from the ring lip.
  • This described part of the bottom closure with its described parts 1 to 6 is formed in one piece from an elastic plastic, preferably from polyethylene or polypropylene.
  • a cover element 7 which follows the contour of the lock plate 1 is placed on the side of the lock plate 1 facing the storage space.
  • This cover element 7 overlaps the outer edge 9 of the locking plate 1 with a circumferential edge 8 facing the hollow piston section 2 and is locked thereon in the longitudinal direction.
  • the peripheral edge 8 of the cover element 7 and the outer locking edge 9 are shaped so that they complement each other that the edge 8 of the cover element engages behind the outer locking edge 9 in a snap-locking manner.
  • the outer locking plate edge 9 has a circumferential annular groove 10 and the edge 8 of the cover element 7 has an inwardly projecting collar 11 which snaps into the groove 10 when the cover element 7 is placed on.
  • the cover element 7 is formed in one piece from such a material, the properties of which are selected in accordance with the mass to be enclosed in the extrusion container.
  • a gas-diffusion-tight and chemically resistant plastic is selected which has a higher rigidity than the plastic of the other bottom closure part 1 to 6 with sufficient elasticity.
  • the cover element 7 is preferably formed with its edge 8 from polyamide, in particular when the remaining part 1 to 6 of the bottom closure consists of polyethylene or polypropylene.
  • the wall thicknesses of the bottom closure parts 1 to 6 and the cover element 7, 8 can be coordinated with one another in such a way that the respective stiffnesses or elasticities for the functionally appropriate effect are achieved.
  • the wall thickness of the cover element 7 can be chosen to be so thin that the described spreading effect is reliably achieved when subjected to mechanical loads.
  • the design of the locking plate, the hollow piston section and the sealing lips as well as their number and the plastic of this component can be selected depending on the desired ventilation and sealing effects and according to the shape and dimensions of the extruded container and depending on the mass to be filled.
  • the corresponding design of the cover element and its material is then determined.
  • the bottom lock according to the invention can thus be adapted practically universally to the respective applications by design and material pairing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Telephonic Communication Services (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Centrifugal Separators (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Coating Apparatus (AREA)
  • Tubes (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A piston-shaped bottom closure for a hollow container has a closing member arranged so that when the closure is inserted into a container the closing member extends transversely of an inner wall of the container, a hollow guiding member extending from the closing member in an axial direction so that in the inserted condition of the closure the guiding member is guided by the inner wall of the container, at least one sealing lip provided on the guiding member and abutting against the inner wall of the container in the inserted condition of the closure, and a cover member arranged on the closing member at its side facing toward a storage chamber of the container and having a contour substantially corresponding to the contour of the closing member, wherein the cover is composed of a material having a different elasticity than the closing and guiding members and the sealing lip and is provided with an edge which extends towards the guiding member and overlaps an outer edge of the closing member so as to be arrested on the closing member in the axial direction.

Description

Die Erfindung bezieht sich auf einen als Ausdrückkolben für zähplastische Massen dienenden Bodenverschluss aus elastischem Kunststoff für einen hohlzylindrischen Strangpressbehälter, insbesondere für eine Kartusche, mit einem zum Vorratsraum des Strangpressbehälters gerichteten Verschlussteller und einem sich zur Einfüllöffnung des Strangpressbehälters erstreckenden, an dessen Innenwandung geführten Hohlkolbenabschnitt, wobei auf die zum Vorratsraum gelegene Seite des Verschlusstellers ein wenigstens angenähert der Kontur des Verschlusstellers folgend geformtes Deckelelement aus einem vom Kunststoff des übrigen Bodenverschlusses verschiedenen elastischen Werkstoff aufgebracht ist, das den äusseren Rand des Verschlusstellers übergreift.The invention relates to a bottom closure made of elastic plastic, serving as an ejection piston for viscous plastic masses, for a hollow cylindrical extrusion container, in particular for a cartridge, with a closure plate directed towards the storage space of the extrusion container and a hollow piston section extending to the filling opening of the extrusion container and guided on the inner wall thereof on the storage compartment side of the lock actuator, a cover element which is at least approximately shaped according to the contour of the lock actuator and is made of an elastic material that differs from the plastic of the rest of the bottom lock is applied, which overlaps the outer edge of the lock actuator.

Bei mit dauerelastischen, dauerplastischen, aushärtenden und anderen ähnlichen pastösen Massen, insbesondere Dichtungsmassen, gefüllten Strangpressbehältern oder Kartuschen werden derartige Ausdrückkolben benötigt, die gleichzeitig bis zur Anwendung der plastischen Masse als Bodenverschluss des Strangpressbehälters dienen. Bei derartigen Bodenverschlüssen sind mehrere Funktionen gleichzeitig zu erfüllen, nämlich: Zum ersten die Entlüftungs- und Abstreiffunktion beim Füllen des Strangpressbehälters mit der jeweiligen Masse, damit alle beim Einbringen der Masse auftretenden Lufteinschlüsse entweichen und haftende Masseteilchen abgestreift werden. Zum zweiten die Dichtungsfunktion, um die eingefüllte Masse bei der Lagerung und beim Transport des Strangpressbehälters sicher gegen Lufteinschlüsse bzw. Masseaustritt abzudichten. Zum dritten die Dichtungs- und Abstreiffunktion beim Ausdrücken der Masse im Gebrauch und zum vierten die vollständige Aufrechterhaltung der Dichtungsfunktion auch bei Unterbrechungen des Ausdrückvorgangs.In the case of extrusion containers or cartridges filled with permanently elastic, permanently plastic, hardening and other similar pasty compositions, in particular sealing compositions, such extrusion pistons are required which, at the same time, serve as the bottom closure of the extrusion container until the plastic composition is used. In the case of floor closures of this type, several functions have to be performed simultaneously, namely: Firstly, the venting and stripping function when filling the extrusion container with the respective mass, so that all air inclusions occurring when the mass is introduced escape and adhering mass particles are stripped off. Secondly, the sealing function in order to securely seal the filled mass against air inclusions or mass leakage during storage and transport of the extruded container. Thirdly, the sealing and stripping function when the mass is being squeezed out in use, and fourthly, the complete maintenance of the sealing function even when the squeezing process is interrupted.

Als Ausdrückkolben dienende Bodenverschlüsse sind in verschiedener Ausgestaltung bekannt (z. B. DE-PS Nr. 2034047, DE-OS Nr. 3005855, EP-A Nr. 0004100). Solche Bodenverschlüsse werden zur Erzielung der für die Gesamtfunktion des Bodenverschlusses erforderlichen Elastizität aus einem möglichst elastischen Kunststoff hergestellt, z. B. aus Polyäthylen bzw. Polypropylen. In der Praxis hat sich nun gezeigt, dass derartige besonders elastische Kunststoffe eine verhältnismässig hohe Gas- bzw. Wasserdampfdurchlässigkeit aufweisen. Es ist jedoch häufig erforderlich, in Strangpressbehältern und insbesondere in Kartuschen massen abzufüllen, die flüchtige Bestandteile enthalten, insbesondere Lösungsmittel, die bei einer derartigen Gasdurchlässigkeit durch die Kolbenwandungen diffundieren können, so dass die erforderliche Dichtheit des Bodenverschlusses insbesondere über längere Lagerzeiten für derartige Massen nicht gewährleistet ist und diese Massen allmählich eine nicht tragbare Veränderung erfahren, z. B. eine vorzeitige Aushärtung. Werden nun statt der erwähnten stark elastischen Kunststoffe solche Kunststoffe verwendet, die die notwendige Gasdiffusionsdichtheit aufweisen, so hat sich gezeigt, dass derartige Kunststoffe gleichzeitig eine derart erhöhte Härte oder Steifigkeit aufweisen, dass die für die geschilderte Gesamtfunktion des Bodenverschlusses und Ausdrückkolbens erforderliche Elastizität nicht gewährleistet ist, insbesondere nicht die Entlüftungsfunktion und die Abstreif- und Abdichtwirkung bei Beaufschlagung des Bodenverschlusses als Ausdrückkolben.Bottom closures serving as push-out pistons are known in various configurations (e.g. DE-PS No. 2034047, DE-OS No. 3005855, EP-A No. 0004100). Such bottom closures are made of the most elastic plastic possible to achieve the elasticity required for the overall function of the bottom closure, e.g. B. made of polyethylene or polypropylene. In practice, it has now been shown that such particularly elastic plastics have a relatively high gas or water vapor permeability. However, it is often necessary to fill masses in extrusion containers, and in particular in cartridges, which contain volatile constituents, in particular solvents, which can diffuse through the piston walls with such gas permeability, so that the required tightness of the bottom closure, particularly over longer storage times, does not guarantee such masses and these masses are gradually undergoing an unacceptable change, e.g. B. premature curing. If, instead of the strongly elastic plastics mentioned, plastics are used that have the necessary gas diffusion tightness, it has been shown that such plastics at the same time have such an increased hardness or rigidity that the elasticity required for the described overall function of the bottom closure and ejection piston is not guaranteed , especially not the ventilation function and the wiping and sealing effect when the bottom lock is acted on as an ejection piston.

Aus der US-PS Nr. 4027810 ist ein Verschlusskolben bekannt, der mit einem Ausdrückkolben der eingangs angegebenen Art vergleichbar ist. Ein innerer Kolben aus steiferem Werkstoff ist aussen vollständig mit einer weicheren Kunststoffbeschichtung versehen, die über Dichtungslippen an der Behälterwandung anliegt. Der bei diesem Verschlusskolben verwendete sogenannte Verschlussteller oder auch -boden ist konkav vom Vorratsraum des Behälters fort eingewölbt. Dieser bekannte Kolben kann die geschilderten notwendigen Funktionen nicht erfüllen: Wegen der konkaven Einwölbung des Verschlusstellers werden Lufteinschlüsse begünstigt und können nicht abgeführt werden. Wird der Kolben gegen die Masse mit Druck beaufschlagt, so wölbt sich der Verschlussteller zur Masse hin nach vorn aus, so dass der äussere Rand des Verschlusstellers einschliesslich der äusseren weichen Kunststoffbeschichtung nach innen eingezogen wird, so dass die Dichtungs- und die Abstreiffunktion erheblich beeinträchtigt bzw. verhindert werden. Schliesslich fehlt es dem bekannten Kolben an der geschilderten Gasdiffusionsdichtheit, da jede zusätzliche Abdichtung des Verschlusstellers sowohl auf dessen Fläche als auch in der Funktion an dessen Rand fehlt. Der weiche äussere Kunststoffüberzug kann eine derartige Diffusionsdichtheit nicht bewerkstelligen. Somit werden bei dem bekannten Kolben weder die geschilderten notwendigen Funktionen erfüllt noch eine Diffusionsdichtheit erreicht.From US-PS No. 4027810 a locking piston is known, which is comparable to an ejection piston of the type specified at the outset. An inner piston made of a stiffer material is completely coated on the outside with a softer plastic coating, which lies against the container wall via sealing lips. The so-called locking plate or bottom used in this locking piston is concavely curved away from the storage space of the container. This known piston cannot perform the necessary functions described: due to the concave curvature of the lock actuator, air pockets are favored and cannot be removed. If the piston is pressurized against the mass, the locking plate bulges forward towards the mass, so that the outer edge of the locking plate, including the outer soft plastic coating, is drawn inwards, so that the sealing and stripping functions are significantly impaired or . be prevented. Finally, the known piston lacks the gas diffusion tightness described, since any additional sealing of the closure actuator is missing both on its surface and in its function at its edge. The soft outer plastic coating cannot achieve such diffusion tightness. Thus, in the known piston neither the described necessary functions are fulfilled nor is diffusion tightness achieved.

Der Erfindung liegt die Aufgabe zugrunde, durch eine weitere Ausgestaltung des Bodenverschlusses der eingangs angegebenen Art zu erreichen, dass einerseits die geschilderten Funktionen des Kolbens vollständig erfüllt werden und insbesondere die für die Funktionsfähigkeit des Bodenverschlusses erforderliche Elastizität gewährleistet ist und andererseits auf den zum Vorratsraum des Strangpressbehälters gelegenen Flächen die erforderliche Beständigkeit und Diffusionsdichtigkeit sichergestellt werden. Dabei soll eine einfache, für die Kunststofformung günstige Bauform erzielt werden. Insgesamt soll eine möglichst universelle Einsatzfähigkeit des Bodenverschlusses auch für aggressive oder flüchtige Bestandteile abgebende Massen ermöglicht werden sowie ein Einsatz bei unterschiedlicher Art der Beaufschlagung des Bodenverschlusses bei seiner Funktion als Ausdrückkolben.The invention has for its object to achieve by a further embodiment of the bottom closure of the type specified that on the one hand the described functions of the piston are completely fulfilled and in particular the elasticity required for the functionality of the bottom closure is guaranteed and on the other hand to the storage room of the extruded container the required stability and diffusion tightness are ensured. The aim is to achieve a simple design that is favorable for plastic molding. All in all, the universal use of the base closure should be made possible as far as possible, even for masses that release aggressive or volatile components, as well as use with different types of loading of the base closure in its function as a push-out piston.

Dies wird ausgehend von einem Bodenverschluss der eingangs angegebenen Art nach der Erfindung dadurch erreicht, dass das Deckelement aus steiferem Werkstoff als dem des zum Vorratsraum des Strangpressbehälters konvex gewölbten Verschlusstellers und des Hohlkolbenabschnitts geformt ist und mit einem umlaufenden äusseren Rand den komplementär geformten äusseren Verschlusstellerrand schnappend verriegelnd hintergreift und auf dem verbleibenden Hohlkolbenabschnitt wenigstens eine aus dessen Werkstoff geformte und dessen Aussenwand umgebende, an der Behälterinnenwand anliegende elastische Dichtlippe angeordnet ist. Hierdurch ist es möglich, den übrigen Bodenverschluss mit Ausnahme des Deckelelements aus demjenigen elastischen Kunststoff zu formen, der die Funktion des Bodenverschlusses vollauf gewährleistet, und den der Masse und deren Bestandteilen ausgesetzten vorderen Teil des Bodenverschlusses durch das Dekkelelement aus einem solchen Werkstoff zu fertigen, der die erforderliche Beständigkeit und Diffusionsdichtheit gegenüber der jeweils im Vorratsraum eingeschlossenen Masse aufweist. Das Dekkelelement und der übrige Bodenverschluss mit Verschlussteller, Hohlkolbenabschnitt und Dichtlippe bzw. -lippen können als einfache Bauteile aus dem jeweiligen Werk- bzw. Kunststoff geformt, insbesondere im Fall von Kunststoff spritzgegossen werden und lassen sich durch einfaches Aufsetzen des Deckelelements auf den Verschlussteller einfach und leicht sicher miteinander verbinden. Das Deckelelement kann aus geeignetem Kunststoff oder geeignetem metallischen Werkstoff, z. B. aus Aluminium oder -legierung, geformt sein.This is achieved on the basis of a bottom closure of the type specified at the outset according to the invention in that the cover element is made of a more rigid material than that of the stock space of the extruded container is convexly curved locking plate and the hollow piston section and snaps behind the complementarily shaped outer locking plate edge with a circumferential outer edge and engages behind the remaining hollow piston section at least one elastic sealing lip formed from its material and surrounding its outer wall and arranged against the inner wall of the container. This makes it possible to form the rest of the bottom closure, with the exception of the cover element, from the elastic plastic that fully guarantees the function of the bottom closure, and to manufacture the front part of the bottom closure, which is exposed to the mass and its components, by the cover element from such a material that has the required resistance and diffusion tightness to the mass enclosed in the storage room. The cover element and the rest of the bottom closure with the locking plate, hollow piston section and sealing lip or lips can be molded as simple components from the respective material or plastic, in particular in the case of plastic, and can be simply and simply placed on the locking plate by the cover element easy to connect securely. The cover element can be made of a suitable plastic or a suitable metallic material, e.g. B. made of aluminum or alloy.

Der erfindungsgemäss gestaltete Bodenverschluss kann in seinen übrigen Formen auf der Innenseite des Verschlusstellers mit dem Ringanschlag und der vorragenden Ringlippe nach der DE-PS Nr. 2034047 sowie mit den entsprechend der DE-OS Nr. 3005855 ausgestalteten Dichtlippen versehen werden. Wird der Bodenverschluss als Ausdrückkolben mit einem mechanischen Kolben betätigt, so übernimmt der äussere Rand des Deckelelements die Wirkung der vorderen Schublippe, also die Abstreif- und Dichtungswirkung. Wird der Bodenverschluss als Ausdrückkolben mit Hilfe eines Druckmittels beaufschlagt, so übernimmt die Dichtlippe bzw. übernehmen die Dichtlippen auf dem Umfang des Hohlkolbenabschnitts die notwendige Abdichtung. Durch die erfindungsgemässe Werkstoffpaarung von Deckelelement und übrigem Bodenverschluss kann eine hohe Elastizität des übrigen Bodenverschlusses gewähltwerden, um die geschilderten Funktionen zu gewährleisten, und es kann das Deckelelement aufgrund seiner Steifigkeit als sicher abschliessendes und abstreifendes vorderes Element des Bodenverschlusses und damit des Ausdrückkolbens eingesetzt werden. Wird bei der Verwendung des Strangpressbehälters nach einer vorherigen Beaufschlagung des Bodenverschlusses als Ausdrückkolben diese Beaufschlagung unterbrochen, so kann sich nach Entfernen des Betätigungsdrucks vom Bodenverschluss sich dieser ggf. im Strangpressbehälter aufbauende Druck durch Zurückweichen des höherelastischen Bodenverschlussteils bei steiferem Deckelelement abbauen, so dass ein nachteiliges Nachlaufen von Masse vermieden wird.The bottom closure designed according to the invention can be provided in its other forms on the inside of the closure plate with the ring stop and the projecting ring lip according to DE-PS No. 2034047 and with the sealing lips designed according to DE-OS No. 3005855. If the bottom lock is actuated as a push-out piston with a mechanical piston, the outer edge of the cover element takes over the effect of the front drawer lip, that is to say the stripping and sealing effect. If a pressure medium acts on the bottom closure as a push-out piston, the sealing lip or the sealing lips on the circumference of the hollow piston section take over the necessary sealing. Due to the material pairing according to the invention of the cover element and the rest of the bottom closure, a high elasticity of the rest of the bottom closure can be selected in order to ensure the functions described, and due to its rigidity the cover element can be used as a securely closing and stripping front element of the bottom closure and thus of the push-out piston. If, when using the extrusion container after a previous application of the bottom closure as a push-out piston, this exposure is interrupted, after removing the actuation pressure from the bottom closure, this pressure, which may build up in the extrusion container, can be relieved by retreating the more elastic bottom closure part with a stiffer cover element, so that disadvantageous after-running is avoided by mass.

Somit wird durch die Erfindung die Einsatzfähigkeit des Bodenverschlusses wesentlich gefördert und insbesondere bei vollständiger Erfüllung aller geschilderter Funktionen eine den Eigenschaften der jeweils eingeschlossenen Masse entsprechende sichere Abdichtung zum Vorratsraum des Strangpressbehälters hin erzielt, wobei in der geschilderten Weise praktisch unabhängig von der Ausbildung des Bodenverschlusses im übrigen der Werkstoff bzw. Kunststoff des Deckelelements den jeweiligen Anforderungen der eingeschlossenen Masse entsprechend gewählt werden kann.Thus, the usability of the bottom closure is significantly promoted by the invention and, in particular when all the functions described are fulfilled, a secure seal corresponding to the properties of the enclosed mass to the storage space of the extruded container is achieved, in the manner described practically independently of the design of the bottom closure for the rest the material or plastic of the cover element can be selected according to the respective requirements of the enclosed mass.

Als für viele Anwendungsfälle besonders zweckmässige Ausgestaltung der Erfindung hat es sich erwiesen, wenn das Deckelelement aus Polyamid und der übrige Bodenverschluss, also der Verschlussteller und der Hohlkolbenabschnitt mit seiner Dichtlippe oder seinen Dichtlippen, aus Polyäthylen oder Polypropylen geformt sind. Das Polyamid des Deckelelements weist eine hohe chemische Beständigkeit und insbesondere eine hohe Gasdiffusionsdichtheit auf, während das Polyäthylen oder Polypropylen die hohe, funktionsgerechte Elastizität des übrigen Bodenverschlusses sicherstellt.As a particularly expedient embodiment of the invention for many applications, it has proven if the cover element is made of polyamide and the rest of the bottom closure, that is to say the closure plate and the hollow piston section with its sealing lip or lips, are formed from polyethylene or polypropylene. The polyamide of the cover element has a high chemical resistance and in particular a high gas diffusion tightness, while the polyethylene or polypropylene ensures the high, functional elasticity of the rest of the bottom closure.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus den Ausprüchen und aus der nachfolgenden Beschreibung eines Ausführungsbeispiels der Erfindung anhand der Zeichnung. Es zeigen:

  • Fig. 1 einen Längsschnitt durch einen Bodenverschluss nach der Erfindung,
  • Fig. 2 eine vergrösserte geschnittene Ansicht eines Ausschnitts aus Fig. 1 im Randbereich von Verschlussteller und Deckelelement,
  • Fig. 3 einen Längsschnitt durch den in einen Stangpressbehälter eingeschobenen Bodenverschluss nach Fig. 1,
  • Fig. 4 einen Längsschnitt entsprechend Fig. 3 mit mechanischer Beaufschlagung des Bodenverschlusses zum Ausdrücken der eingeschlossenen Masse.
Further features, details and advantages of the invention result from the claims and from the following description of an embodiment of the invention with reference to the drawing. Show it:
  • 1 shows a longitudinal section through a bottom closure according to the invention,
  • 2 shows an enlarged sectional view of a detail from FIG. 1 in the edge region of the closure plate and cover element,
  • 3 shows a longitudinal section through the bottom closure according to FIG. 1 pushed into an extruded container,
  • Fig. 4 shows a longitudinal section corresponding to Fig. 3 with mechanical loading of the bottom closure to express the enclosed mass.

Der in der Zeichnung dargestellte Bodenverschluss weist einen zum Vorratsraum des Strangpressbehälters gerichteten, in diese Richtung vorgewölbten Verschlussteller 1 sowie einen sich zur Einfüllöffnung des Strangpressbehälters erstrekkenden Hohlkolbenabschnitt 2 auf, der, wie sich auf Fig. 3 und 4 ergibt, an der Innenwandung des Strangpressbehälters 3 geführt ist. Am Hohlkolbenabschnitt 2 sind ferner dessen Aussenwand umgebend elastische Dichtlippen 4 vorgesehen, die entsprechend der Gestaltung nach DE-OS Nr. 3005855 geformt sind. Ferner ist innerhalb des Hohlkolbenabschnitts 2 und unmittelbar im Anschluss an die Innenwandung des Verschlusstellers 1 eine zur offenen Seite des Hohlkolbenabschnitts vorragende Ringlippe 5 angeordnet, und es trägt der Verschiussteiier aufseinerimlnneren des Hohlkolbenabschnitts 2 gelegenen Wandung einen gegenüber der Ringlippe zurückstehenden Ringanschlag 6.The bottom closure shown in the drawing has a closure plate 1 directed towards the storage space of the extruded container and bulging in this direction, as well as a hollow piston section 2 which extends to the filling opening of the extruded container and which, as can be seen in FIGS. 3 and 4, on the inner wall of the extruded container 3 is led. On the hollow piston section 2, the outer wall surrounding elastic sealing lips 4 are also provided, which are shaped according to the design according to DE-OS No. 3005855. Furthermore, an annular lip 5 protruding toward the open side of the hollow piston section is arranged within the hollow piston section 2 and immediately following the inner wall of the locking plate 1, and the Verschiussteiier carries on its inner wall of the hollow piston section 2 a ring stop 6 which is set back from the ring lip.

Dieser beschriebene Teil des Bodenverschlusses mit seinen beschriebenen Teilen 1 bis 6 ist einstückig aus einem elastischen Kunststoff geformt, vorzugsweise aus Polyäthylen oder Polypropylen.This described part of the bottom closure with its described parts 1 to 6 is formed in one piece from an elastic plastic, preferably from polyethylene or polypropylene.

Auf die zum Vorratsraum gelegene Seite des Verschlusstellers 1 ist ein der Kontur des Verschlusstellers 1 folgend geformtes Deckelelement 7 aufgesetzt. Dieses Deckelelement 7 übergreift mit einem umlaufenden, zum Hohlkolbenabschnitt 2 weisenden Rand 8 den äusseren Rand 9 des Verschlusstellers 1 und ist darauf in Längsrichtung arretiert. Für diese Arretierung sind der umlaufende Rand 8 des Deckelelements 7 und der äussere Verschlusstellerrand 9 derart komplementär zueinander geformt, dass der Rand 8 des Dekkelelements den äusseren Verschlusstellerrand 9 schnappend verriegelnd hintergreift. Wie insbesondere Fig. 2 zeigt, weist dazu der äussere Verschlusstellerrand 9 eine umlaufende Ringnut 10 und der Rand 8 des Deckelelements 7 einen nach innen vorspringenden Kragen 11 auf, der beim Aufsetzen des Deckelelements 7 in die Nut 10 einschnappt.A cover element 7 which follows the contour of the lock plate 1 is placed on the side of the lock plate 1 facing the storage space. This cover element 7 overlaps the outer edge 9 of the locking plate 1 with a circumferential edge 8 facing the hollow piston section 2 and is locked thereon in the longitudinal direction. For this locking, the peripheral edge 8 of the cover element 7 and the outer locking edge 9 are shaped so that they complement each other that the edge 8 of the cover element engages behind the outer locking edge 9 in a snap-locking manner. As shown in FIG. 2 in particular, the outer locking plate edge 9 has a circumferential annular groove 10 and the edge 8 of the cover element 7 has an inwardly projecting collar 11 which snaps into the groove 10 when the cover element 7 is placed on.

Das Deckelefement 7 ist einstückig aus einem solchen Werkstoff geformt, dessen Eigenschaften entsprechend der im Strangpressbehälter einzuschliessenden Masse gewählt sind. Insbesondere wird ein gasdiffusionsdichter und chemisch beständiger Kunststoff gewählt, der eine höhere Steifigkeit als der Kunststoff des anderen Bodenverschlussteils 1 bis 6 bei ausreichender Elastizität aufweist. Vorzugsweise ist das Deckelelement 7 mit seinem Rand 8 aus Polyamid geformt, insbesondere dann, wenn der übrige Teil 1 bis 6 des Bodenverschlusses aus Polyäthylen oder Polypropylen besteht.The cover element 7 is formed in one piece from such a material, the properties of which are selected in accordance with the mass to be enclosed in the extrusion container. In particular, a gas-diffusion-tight and chemically resistant plastic is selected which has a higher rigidity than the plastic of the other bottom closure part 1 to 6 with sufficient elasticity. The cover element 7 is preferably formed with its edge 8 from polyamide, in particular when the remaining part 1 to 6 of the bottom closure consists of polyethylene or polypropylene.

Wird der anhand Fig. 1 dargestellte und beschriebene Bodenverschluss nach dem Füllen des Strangpressbehälters 3 in diesen eingeschoben, so kann etwaige eingeschlossene Luft in ausreichender Weise aussen am Rand des Deckelelements 7 und an den elastisch nachgebenden Dichtlippen 4 vorbeistreichen. DieserZustand ist in Fig. 3 im hinteren Bereich eines Strangpressbehälters 3 wiedergegeben. Wird nun der Bodenverschluss durch ein geeignetes Vorschubelement mechanisch beaufschlagt, bis die Ringlippe 5 gemäss Fig. 4 so weit zurückgedrängt ist, dass der verwendete Vorschubstössel oder dergleichen auch an dem Ringanschlag 6 anliegt, so wird der äussere Verschlusstellerrand 9 gespreizt, und es kommt der äussere Rand 8 des Deckelelements 7 zur Anlage an der Innenwandung des Strangpressbehälters 3 und übernimmt die Abstreif- und Dichtwirkung beim weiteren Vorschub des Bodenverschlusses oder Ausdrückkolbens nach Art der sonst verwendeten Schublippe. Diesen Zustand zeigt Fig. 4. Wird der Bodenverschluss oder Ausdrückkolben durch Druckmittel für seinen Vorschub beaufschlagt, so übernehmen die Dichtlippen 4 durch Aufweitung die erforderliche Abdichtung, wobei auch hier der äussere Rand des Deckelelements 7 dieAbstreifwirkung übernehmen kann. Wird der Bodenverschluss bzw. Ausdrückkolben vom Vorschub entlastet, so kann der elastischere Teil des Bodenverschlusses derart zurückweichen, dass ein Abbau des im Strangpressbehälter vorhandenen Drucks erfolgt und damit ein Nachlaufen verhindert wird.If the bottom closure shown and described with reference to FIG. 1 is inserted into the extruded container 3 after it has been filled, any trapped air can pass the outside of the edge of the cover element 7 and the elastically yielding sealing lips 4 in a sufficient manner. This state is shown in FIG. 3 in the rear area of an extrusion container 3. If the bottom closure is now mechanically acted upon by a suitable feed element until the ring lip 5 is pushed back as far as shown in FIG. 4 so that the feed plunger or the like also bears against the ring stop 6, then the outer closure edge 9 is spread and the outer edge comes Edge 8 of the cover element 7 for contact with the inner wall of the extrusion container 3 and takes over the stripping and sealing effect when the bottom closure or ejection piston is advanced in the manner of the otherwise used drawer lip. This state is shown in FIG. 4. If the bottom closure or ejection piston is acted upon by pressure medium for its advancement, the sealing lips 4 take over the necessary sealing by widening, whereby the outer edge of the cover element 7 can also take over the stripping effect here. If the bottom closure or ejection piston is relieved of the feed, the more elastic part of the bottom closure can retreat in such a way that the pressure in the extrusion container is reduced and consequently a run-on is prevented.

Die Wandstärken der Bodenverschlussteile 1 bis 6 und des Deckelelements 7, 8 können so aufeinander abgestimmt sein, dass die jeweiligen Steifigkeiten bzw. Elastizitäten für die funktionsgerechte Wirkung erzielt werden. Insbesondere kann die Wandstärke des Deckelelements 7 derart dünn gewählt werden, dass die geschilderte Spreizwirkung bei mechanischer Beaufschlagung sicher erreicht wird.The wall thicknesses of the bottom closure parts 1 to 6 and the cover element 7, 8 can be coordinated with one another in such a way that the respective stiffnesses or elasticities for the functionally appropriate effect are achieved. In particular, the wall thickness of the cover element 7 can be chosen to be so thin that the described spreading effect is reliably achieved when subjected to mechanical loads.

Die Ausbildung des Verschlusstellers, des Hohlkolbenabschnitts und der Dichtlippen sowie deren Anzahl und der Kunststoff dieses Bauteils können je nach den gewünschten Entlüftungs- und Dichtungswirkungen und entsprechend der Gestalt und der Abmessungen des Strangpressbehälters sowie in Abhängigkeit von der einzufüllenden Masse gewählt werden. Danach richtet sich dann die entsprechende Ausgestaltung des Deckelelements und seines Werkstoffes. Durch Gestaltung und Werkstoffpaarung kann also der Bodenverschluss nach der Erfindung den jeweiligen Anwendungsfällen praktisch universell angepasst werden.The design of the locking plate, the hollow piston section and the sealing lips as well as their number and the plastic of this component can be selected depending on the desired ventilation and sealing effects and according to the shape and dimensions of the extruded container and depending on the mass to be filled. The corresponding design of the cover element and its material is then determined. The bottom lock according to the invention can thus be adapted practically universally to the respective applications by design and material pairing.

Claims (2)

1. Bottom closure, serving as an expulsion piston for viscous plastic material, of elastic plastics material for a hollow cylindrical extrusion-press container (3), particularly for a cartridge, having a closure plate (1) facing towards the supply chamber of the extrusion-press container and a hollow piston portion (2) extending towards the filling opening of the extrusion-press container and guided by the inner wall surface of the container, wherein, on the side of the closure plate facing towards the supply chamber, there is provided a cover member (7) shaped to follow at least approximately the contour of the closure plate and made of an elastic material different from the plastics material of the rest of the bottom closure, the cover member overlapping the outer edge of the closure plate, characterised in that the cover member (7) is made of stiffer material than that of the closure plate (1) which is curved convexly towards the supply chamber of the extrusion-press container (3) and of the hollow piston portion (2), the cover member has a circumferential outer edge (8) which is in snap-lock engagement over the complementarily shaped outer edge (9) of the closure plate, and at least one elastic sealing lip (4) is provided on the remaining hollow piston portion (2), formed from the material of the piston portion, extending around the outer wall surface of the piston portion, and in contact with the inner wall surface of the container.
2. Bottom closure according to Claim 1, characterised in that the cover member (7, 8) is made of polyamide material and the rest of the bottom closure (1, 2, 4 to 6) is made of polyethylene or polypropylene.
EP82110865A 1981-12-08 1982-11-24 End closure for a hollow cylindrical extrusion pressure container Expired EP0081145B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82110865T ATE15354T1 (en) 1981-12-08 1982-11-24 BOTTOM CLOSURE FOR A HOLLOW CYLINDRICAL EXTRUSION CONTAINER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3148490A DE3148490C2 (en) 1981-12-08 1981-12-08 Bottom closure for a hollow cylindrical extrusion container
DE3148490 1981-12-08

Publications (2)

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EP0081145A1 EP0081145A1 (en) 1983-06-15
EP0081145B1 true EP0081145B1 (en) 1985-09-04

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US (1) US4452370A (en)
EP (1) EP0081145B1 (en)
AT (1) ATE15354T1 (en)
DE (2) DE3148490C2 (en)
DK (1) DK157316C (en)
ES (1) ES269032Y (en)
FI (1) FI76986C (en)
IE (1) IE53921B1 (en)
PT (1) PT75916B (en)

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Publication number Publication date
FI824045L (en) 1983-06-09
IE53921B1 (en) 1989-04-12
PT75916B (en) 1985-01-25
FI824045A0 (en) 1982-11-24
DK157316C (en) 1990-05-07
DE3148490A1 (en) 1983-07-07
DE3148490C2 (en) 1986-02-13
ES269032Y (en) 1983-12-16
ES269032U (en) 1983-06-16
US4452370A (en) 1984-06-05
DK157316B (en) 1989-12-11
ATE15354T1 (en) 1985-09-15
EP0081145A1 (en) 1983-06-15
IE822907L (en) 1983-06-08
FI76986B (en) 1988-09-30
PT75916A (en) 1982-12-01
DK539982A (en) 1983-06-09
DE3266064D1 (en) 1985-10-10
FI76986C (en) 1989-01-10

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