EP0081145A1 - 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
EP0081145A1
EP0081145A1 EP82110865A EP82110865A EP0081145A1 EP 0081145 A1 EP0081145 A1 EP 0081145A1 EP 82110865 A EP82110865 A EP 82110865A EP 82110865 A EP82110865 A EP 82110865A EP 0081145 A1 EP0081145 A1 EP 0081145A1
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EP
European Patent Office
Prior art keywords
closure
bottom closure
cover element
edge
plastic
Prior art date
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Granted
Application number
EP82110865A
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German (de)
French (fr)
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EP0081145B1 (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
Publication of EP0081145A1 publication Critical patent/EP0081145A1/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 cap made of elastic plastic and serving as a push-out 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 with a hollow piston which extends to the filling opening of the extrusion container and leads to the inside wall section at least one elastic sealing lip which is formed from its material and surrounds its outer wall and lies against the inner wall of the container.
  • the invention has for its object to achieve by a further embodiment of the bottom closure of the type specified that at the same time on the one hand the necessary elasticity for the functionality of the bottom closure and on the other hand on the surfaces located to the storage room of the extrusion container, the required durability and diffusion tightness are guaranteed.
  • the aim is to achieve a simple design that is favorable for plastic molding and to promote the function of the entire floor closure. All in all, the universal closure of the base closure should be made as universal as possible, even for masses that deliver aggressive or volatile constituents, as well as use with different types of loading of the base closure in its function as a push-out piston.
  • the cover element and the rest of the bottom closure with the closure plate, hollow piston portion 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 easily and simply placed on the closure plate by simply placing the cover element easily connect with each other, the abutting edges ensuring the necessary locking of the cover element in the longitudinal direction of the bottom closure.
  • the cover element can be formed from a suitable plastic or a suitable metallic material, for example from aluminum or alloy.
  • the bottom closure designed according to the invention can be in its other forms on the inside of the closure plates are provided with the ring stop and the projecting ring lip according to DE-PS 20 34 047 and with the sealing lips designed according to DE-OS 30 05 855. 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, i.e. the wiping and sealing effect. If the bottom lock acts as a push-out piston with the aid of a pressure medium, the sealing lips take over the circumference of the Hollow piston section the necessary seal.
  • the simple lid element in accordance with the design of the bottom closure in accordance with the invention promotes the usability of this bottom closure very extraordinarily and, in particular if the bottom closure is fully functional, a secure seal to the storage space of the extrusion container corresponding to the properties of the enclosed mass is achieved, the described above
  • the plastic of the cover element can be selected according to the particular requirements of the enclosed mass, in particular a gas diffusion-tight plastic can be used.
  • the cover element consists of a stiffer material, in particular plastic, than the plastic of the rest of the bottom closure, that is to say the closure plate and the hollow piston section with its sealing lip or lips. This allows a particularly high elasticity of the rest of the bottom closure to be selected in order to perform the functions described ensure, and because of its rigidity, the closure element can be used as a securely closing and stripping front element of the bottom closure or ejection piston.
  • the following advantage is achieved by this embodiment of the invention: If, when using the extrusion container after a previous application of the bottom closure as a push-out piston, this exposure is interrupted, then in the known bottom closures an undesired running-on of the expressed mass generally occurs because within the Extrusion container builds up pressure due to its always given flexibility. If a bottom closure according to the described embodiment according to the invention is used, it has been found that after removing the actuation pressure from the bottom closure, this pressure, which may build up in the extrusion container, can be reduced by retreating the more elastic bottom closure part with a stiffer cover element. This avoids the disadvantageous run-on of mass.
  • the circumferential edge of the cover element and the outer edge of the closure plate are shaped such that they complement one another such that the edge of the cover element engages behind the outer edge of the closure plate in a snap-locking manner.
  • a joining of the cover element and the closure plate with the hollow piston section is thus possible in a very simple manner with simultaneous secure locking of the cover element on the edge of the closure plate.
  • Both components of the bottom closure are designed to be extremely simple and can be produced in a simple manner from the respective plastic.
  • Cover element 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 extrusion container and bulging in this direction, as well as a hollow piston section 2 which extends to the filling opening of the extrusion container and which, as can be seen from FIGS. 3 and 4, on the inner wall of the extrusion container 3 is led.
  • a hollow piston section 2 On the hollow piston section 2, its outer wall is also elastic sealing lips 4 are provided, which are shaped according to the design according to DE-OS 30 05 855.
  • an annular lip 5 projecting 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 closure plate 1, and the closure plate 1 carries on its wall located inside the hollow piston section 2 a ring stop 6 which is set back relative to 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 is placed which follows the contour of the closure plate 1.
  • This cover element 7 engages with a peripheral edge 8 facing the hollow piston section 2 the outer edge 9 of the closure plate 1 and is locked thereon in the longitudinal direction.
  • the peripheral edge 8 of the cover element 7 and the outer closure plate edge 9 are shaped so as to be complementary to one another that the edge 8 of the cover element engages behind the outer closure plate edge 9 in a snap-locking manner.
  • the outer sealing 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 and chemically resistant plastic 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 formed with its edge 8 made of polyamide, especially if the remaining part 1 to 6 of the bottom closure made 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 functional 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 sealing 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 extrusion container and depending on the mass to be filled.
  • the corresponding design of the cover element and its material is then determined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Centrifugal Separators (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)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (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 und mit wenigstens einer aus dessen Werkstoff geformten und dessen Außenwand umgebenden, an der Behälterinnenwand anliegenden elastischen Dichtlippe.The invention relates to a bottom cap made of elastic plastic and serving as a push-out 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 with a hollow piston which extends to the filling opening of the extrusion container and leads to the inside wall section at least one elastic sealing lip which is formed from its material and surrounds its outer wall and lies against the inner wall of the container.

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. Solche Bodenverschlüsse sind in verschiedener Ausgestaltung bekannt (z.B. DE-PS 20 34 047, DE-OS 30 05 855). 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 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 Funktion des Bodenverschlusses und Ausdrückkolbens erforderliche Elastizität nicht gewährleistet ist, das heißt einerseits die Entlüftungsfunktion beim Einsetzen des Bodenverschlusses und die Abstreif- und Abdichtwirkung bei Beaufschlagung des Bodenverschlusses als Ausdrückkolben.In the case of extrusion containers or cartridges filled with permanently elastic, permanently plastic, hardening and other similar pasty masses, in particular sealing compounds, cartridges of this type are required which simultaneously serve as a bottom closure of the extrusion container until the plastic mass is used. Such floor closures are known in various configurations (eg DE-PS 20 34 047, DE-OS 30 05 855). To achieve the elasticity required for the overall function of the floor closure, such floor closures are produced from a plastic which is as elastic as possible, for example from 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 him required to fill masses in extrusion containers and in particular in cartridges which contain volatile constituents, in particular solvents which, with such gas permeability, can diffuse through the piston walls, so that the required tightness of the bottom closure, particularly over longer storage times, is not guaranteed for such masses and these masses gradually experience an unacceptable change, e.g. premature curing. If, instead of the strongly elastic plastics mentioned, such plastics are used which 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 function of the bottom closure and ejection piston is not guaranteed, that means on the one hand the venting function when the bottom lock is inserted and the wiping and sealing effect when the bottom lock is acted on as a push-out piston.

Der Erfindung liegt die Aufgabe zugrunde, durch eine weitere Ausgestaltung des Bodenverschlusses der eingangs angegebenen Art zu erreichen, daß gleichzeitig einerseits die für die Funktionsfähigkeit des Bodenverschlusses erforderliche Elastizität und andererseits auf den zum Vorratsraum des Strangpreßbehälters gelegenen Flächen die erforderliche Beständigkeit und Diffusionsdichtigkeit gewährleistet werden. Dabei soll eine einfache, für die Kunststofformung günstige Bauform erzielt und die Funktion des gesamten Bodenverschlusses gefördert werden. Insgesamt soll eine möglichst universielle 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. Dies wird bei einem Bodenverschluß der eingangs angegebenen Art nach der Erfindung vor allem dadurch erreicht, daß 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, also des Verschlußtellers und des Hohlkolbenabschnitts mit seiner Dichtlippe oder seinen Dichtlippen, verschiedenen elastischen Werkstoff aufgesetzt ist, das mit einem umlaufenden, zum Hohlkolbenabschnitt weisenden Rand den äußeren Rand des Verschlußtellers übergreift und darauf in Längsrichtung arretiert 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 Deckelelement aus einem solchen Werkstoff zu fertigen, der die erforderliche Beständigkeit und Diffusionsdichtheit gegenüber der jeweils im Vorratsraum eingeschlossenen Masse aufweist. Das Deckelelement 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 miteinander verbinden, wobei die aneinander liegenden Ränder die notwendige Arretierung des Deckelelements in Längsrichtung des Bodenverschlusses gewährleisten. Das Deckelelement kann aus geeignetem Kunststoff oder geeignetem metallischen Werkstoff, z.B. aus Aluminium oder -legierung, geformt sein.The invention has for its object to achieve by a further embodiment of the bottom closure of the type specified that at the same time on the one hand the necessary elasticity for the functionality of the bottom closure and on the other hand on the surfaces located to the storage room of the extrusion container, the required durability and diffusion tightness are guaranteed. The aim is to achieve a simple design that is favorable for plastic molding and to promote the function of the entire floor closure. All in all, the universal closure of the base closure should be made as universal as possible, even for masses that deliver aggressive or volatile constituents, as well as use with different types of loading of the base closure in its function as a push-out piston. This is achieved in a bottom closure of the type specified at the outset according to the invention, in particular, in that on the side of the locking plate located towards the storage space an at least approximately shaped contour of the closing plate follows a cover element made of a plastic of the remaining bottom closure, i.e. the locking plate and the hollow piston section with its sealing lip or its sealing lips, different elastic material is placed, which overlaps the outer edge of the closure plate with a circumferential edge facing the hollow piston section and is locked thereon in the longitudinal direction. 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 closure plate, hollow piston portion 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 easily and simply placed on the closure plate by simply placing the cover element easily connect with each other, the abutting edges ensuring the necessary locking of the cover element in the longitudinal direction of the bottom closure. The cover element can be formed from a suitable plastic or a suitable metallic material, for example from 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 20 34 047 sowie mit den entsprechend der DE-OS 30 05 855 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 übernehmen die Dichtlippen auf dem Umfang des Hohlkolbenabschnitts die notwendige Abdichtung.The bottom closure designed according to the invention can be in its other forms on the inside of the closure plates are provided with the ring stop and the projecting ring lip according to DE-PS 20 34 047 and with the sealing lips designed according to DE-OS 30 05 855. 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, i.e. the wiping and sealing effect.If the bottom lock acts as a push-out piston with the aid of a pressure medium, the sealing lips take over the circumference of the Hollow piston section the necessary seal.

Es wird somit durch das einfache Deckelelement gemäß der erfindungsgemäßen Ausgestaltung des Bodenverschlusses die Einsatzfähigkeit dieses Bodenverschlusses ganz außerordentlich gefördert und insbesondere bei vollständiger Funktionsfähigkeit des Bodenverschlusses im übrigen ein 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 Kunststoff des Deckelelements den jeweiligen Anforderungen der eingeschlossenen Masse entsprechend gewählt werden kann, insbesondere kann ein gasdiffusionsdichter Kunststoff eingesetzt werden.The simple lid element in accordance with the design of the bottom closure in accordance with the invention promotes the usability of this bottom closure very extraordinarily and, in particular if the bottom closure is fully functional, a secure seal to the storage space of the extrusion container corresponding to the properties of the enclosed mass is achieved, the described above In this way, practically regardless of the design of the bottom closure, the plastic of the cover element can be selected according to the particular requirements of the enclosed mass, in particular a gas diffusion-tight plastic can be used.

Nach einer Ausführungsform der Erfindung besteht das Deckelelement aus einem gegenüber dem Kunststoff des übrigen Bodenverschlusses, also des Verschlußtellers und des Hohlkolbenabschnitts mit seiner Dichtlippe oder seinen Dichtlippen, steiferem Werkstoff, insbesondere Kunststoff. Hierdurch kann eine besonders hohe Elastizität des übrigen Bodenverschlusses gewählt werden, um die geschilderten Funktionen zu gewährleisten, und es kann das Verschlußelement aufgrund seiner Steifigkeit als sicher abschließendes und abstreifendes vorderes Element des Bodenverschlusses bzw. Ausdrückkolbens eingesetzt werden. Insbesondere wird durch diese Ausgestaltung der Erfindung folgender Vorteil erzielt: Wird bei der Verwendung des Strangpreßbehälters nach einer vorherigen Beaufschlagung des Bodenverschlusses als Ausdrückkolben diese Beaufschlagung unterbrochen, so tritt bei den bekannten Bodenverschlüssen in der Regel ein unerwünschtes Nachlaufen der ausgedrückten Masse auf, da sich innerhalb des Strangpreßbehälters durch dessen stets gegebene Nachgiebigkeit ein Druck aufbaut. Wird ein Bodenverschluß gemäß der geschilderten Ausgestaltung nach der Erfindung eingesetzt, so hat sich gezeigt, daß nach Entfernen des Betätigungsdrucks vom Bodenverschluß sich dieser ggf. im Strangpreßbehälter aufbauende Druck durch Zurückweichen des höherelastischen Bodenverschlußteils bei steiferem Deckelelement abbauen kann. Dadurch wird das so nachteilige Nachlaufen von Masse vermieden.According to one embodiment of the invention, the cover element consists of a stiffer material, in particular plastic, than the plastic of the rest of the bottom closure, that is to say the closure plate and the hollow piston section with its sealing lip or lips. This allows a particularly high elasticity of the rest of the bottom closure to be selected in order to perform the functions described ensure, and because of its rigidity, the closure element can be used as a securely closing and stripping front element of the bottom closure or ejection piston. In particular, the following advantage is achieved by this embodiment of the invention: If, when using the extrusion container after a previous application of the bottom closure as a push-out piston, this exposure is interrupted, then in the known bottom closures an undesired running-on of the expressed mass generally occurs because within the Extrusion container builds up pressure due to its always given flexibility. If a bottom closure according to the described embodiment according to the invention is used, it has been found that after removing the actuation pressure from the bottom closure, this pressure, which may build up in the extrusion container, can be reduced by retreating the more elastic bottom closure part with a stiffer cover element. This avoids the disadvantageous run-on of mass.

Nach einer für die Montage und Handhabung des Bodenverschlusses besonders vorteilhaften weiteren Ausgestaltung der Erfindung sind der umlaufende Rand des Deckelelements und der äußere Verschlußtellerrand derart komplementär zueinander geformt, daß der Rand des Deckelelements den äußeren Verschlußtellerrand schnappend verriegelnd hintergreift. Ein Zusammenfügen von Deckelelement und Verschlußteller mit Hohlkolbenabschnitt ist dadurch auf höchst einfache Weise mit gleichzeitiger sicherer Arretierung des Deckelelements auf dem Verschlußtellerrand möglich. Dabei sind beide Bauteile des Bodenverschlusses denkbar einfach gestaltet und lassen sich aus dem jeweiligen Kunststoff auf einfache Weise herstellen.According to a further embodiment of the invention which is particularly advantageous for the assembly and handling of the bottom closure, the circumferential edge of the cover element and the outer edge of the closure plate are shaped such that they complement one another such that the edge of the cover element engages behind the outer edge of the closure plate in a snap-locking manner. A joining of the cover element and the closure plate with the hollow piston section is thus possible in a very simple manner with simultaneous secure locking of the cover element on the edge of the closure plate. Both components of the bottom closure are designed to be extremely simple and can be produced in a simple manner from the respective plastic.

Als für viele Anwendungsfelle 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 useful embodiment of the invention for many applications, it has proven that Cover element 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 Ansprüchen 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 Strangpreßbehälter 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 is 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 inserted into an extrusion 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 erstreckenden Hohlkolbenabschnitts 2 auf, der, wie sich aus 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 30 05 855 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 Verschlußteller 1 auf seiner im Inneren 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 extrusion container and bulging in this direction, as well as a hollow piston section 2 which extends to the filling opening of the extrusion container and which, as can be seen from FIGS. 3 and 4, on the inner wall of the extrusion container 3 is led. On the hollow piston section 2, its outer wall is also elastic sealing lips 4 are provided, which are shaped according to the design according to DE-OS 30 05 855. Furthermore, an annular lip 5 projecting 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 closure plate 1, and the closure plate 1 carries on its wall located inside the hollow piston section 2 a ring stop 6 which is set back relative to 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 Deckelelements 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.On the side of the closure plate 1 facing the storage space, a cover element 7 is placed which follows the contour of the closure plate 1. This cover element 7 engages with a peripheral edge 8 facing the hollow piston section 2 the outer edge 9 of the closure plate 1 and is locked thereon in the longitudinal direction. For this locking, the peripheral edge 8 of the cover element 7 and the outer closure plate edge 9 are shaped so as to be complementary to one another that the edge 8 of the cover element engages behind the outer closure plate edge 9 in a snap-locking manner. As shown in FIG. 2 in particular, the outer sealing 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 Deckelelement 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 and chemically resistant plastic selected, which has a higher rigidity than the plastic of the other bottom closure part 1 to 6 with sufficient elasticity Preferably, the cover element 7 is formed with its edge 8 made of polyamide, especially if the remaining part 1 to 6 of the bottom closure made 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. Dieser Zustand 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 8 des Deckelelements 7 die Abstreifwirkung 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 extrusion 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 annular 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, the outer closure plate edge 9 is spread and the outer edge comes Edge 8 of the cover element 7 for bearing against the inner wall of the extrusion container 3 and takes over the wiping 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 advance, the sealing lips 4 take over the necessary sealing by widening, whereby the outer edge 8 of the cover element 7 can also take over the stripping effect here. If the bottom lock or ejection piston is relieved of the feed, the more elastic part of the bottom lock can retreat in such a way that a The pressure in the extrusion container is reduced, thus preventing overrun.

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 functional 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 sealing 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 extrusion container and depending on the mass to be filled. The corresponding design of the cover element and its material is then determined. By design and pairing of materials, the bottom closure according to the invention can be adapted practically universally to the respective applications.

Claims (4)

1. Als Ausdrückkolben für zähplastische Massen dienender 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 und mit wenigstens einer aus dessen Werkstoff geformten und dessen Außenwand umgebenden, an der Behälterinnenwand anliegenden elastischen Dichtlippe, dadurch gekennzeichnet, daß auf die zum Vorratsraum gelegene Seite des Verschlußtellers (1) ein wenigstens angenähert der Kontur des Verschlußtellers folgend geformtes Deckelelement (7) aus einem vom Kunststoff des übrigen Bodenverschlusses (1 bis 6) verschiedenen elastischen Werkstoff aufgesetzt ist, das mit einem umlaufenden, zum Hohlkolbenabschnitt (2) weisenden Rand .(8) den äußeren Rand (9) des Verschlußtellers (1) übergreift und darauf in Längsrichtung arretiert ist.1. As a push-out piston for viscous-plastic mass-serving bottom closure made of elastic plastic 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 having at least one hollow piston portion on the inner wall thereof Material-shaped and surrounding its outer wall, which rests against the inner wall of the container, characterized in that on the side of the locking plate (1) facing the storage space there is a cover element (7) which is at least approximately shaped according to the contour of the locking plate and which is made from a plastic of the remaining bottom closure ( 1 to 6) different elastic material is placed, which overlaps with an encircling edge facing the hollow piston section (2). (8) overlaps the outer edge (9) of the closure plate (1) and locks it in the longitudinal direction is established. 2. Bodenverschluß nach Anspruch 1, dadurch gekennzeichnet, daß der umlaufende Rand (8) des Deckelelements (7) und der äußere Verschlußtellerrand (9) derart komplementär zueinander geformt sind (10,11), daß der Rand (8) des Deckelelements (7) den äußeren Verschlußtellerrand (9) schnappend verriegelnd hintergreift.2. Bottom closure according to claim 1, characterized in that the peripheral edge (8) of the cover element (7) and the outer closure plate edge (9) are shaped so as to complement each other (10, 11) that the edge (8) of the Cover element (7) engages behind the outer locking plate edge (9) in a snap-locking manner. 3. Bodenverschluß nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Deckelelement (7,8) aus gegenüber dem Kunststoff des übrigen Bodenverschlusses (1 bis 6) steiferen elastischen Werkstoff, insbesondere Kunststoff, geformt ist.3. Bottom closure according to claim 1 or 2, characterized in that the cover element (7,8) from the plastic of the rest of the bottom closure (1 to 6) stiffer elastic material, in particular plastic, is formed. 4. Bodenverschluß nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Deckelelement (7,8) aus Polyamid und der übrige Bodenverschluß (1 bis 6) aus Polyäthylen oder Polypropylen geformt sind.4. Bottom closure according to one of claims 1 to 3, characterized in that the cover element (7,8) made of polyamide and the rest of the bottom closure (1 to 6) are formed from 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
DE3148490 1981-12-08
DE3148490A DE3148490C2 (en) 1981-12-08 1981-12-08 Bottom closure for a hollow cylindrical extrusion container

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EP0081145A1 true EP0081145A1 (en) 1983-06-15
EP0081145B1 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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EP0647569A1 (en) * 1993-10-04 1995-04-12 Falk Walter Schneider Piston for cartridges
EP1514812A1 (en) * 2003-09-10 2005-03-16 Heraeus Kulzer GmbH Cartridge with ventilating piston
EP1514611A2 (en) 2003-09-10 2005-03-16 Heraeus Kulzer GmbH Closing piston for catridges having venting and barrier properties
US7621428B2 (en) 2005-07-01 2009-11-24 Nordson Corporation Dispensing cartridge with vented piston
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US4452370A (en) 1984-06-05
IE53921B1 (en) 1989-04-12
ES269032U (en) 1983-06-16
IE822907L (en) 1983-06-08
EP0081145B1 (en) 1985-09-04
DK157316C (en) 1990-05-07
FI824045A0 (en) 1982-11-24
FI76986C (en) 1989-01-10
FI824045L (en) 1983-06-09
PT75916A (en) 1982-12-01
DE3148490A1 (en) 1983-07-07
FI76986B (en) 1988-09-30
ATE15354T1 (en) 1985-09-15
DE3266064D1 (en) 1985-10-10
DK157316B (en) 1989-12-11
DE3148490C2 (en) 1986-02-13
ES269032Y (en) 1983-12-16
DK539982A (en) 1983-06-09
PT75916B (en) 1985-01-25

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