EP0078936A2 - Pressured container for delivering assembly foam, especially one-component polyurethane foam - Google Patents

Pressured container for delivering assembly foam, especially one-component polyurethane foam Download PDF

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Publication number
EP0078936A2
EP0078936A2 EP82109534A EP82109534A EP0078936A2 EP 0078936 A2 EP0078936 A2 EP 0078936A2 EP 82109534 A EP82109534 A EP 82109534A EP 82109534 A EP82109534 A EP 82109534A EP 0078936 A2 EP0078936 A2 EP 0078936A2
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EP
European Patent Office
Prior art keywords
pressure
cylinder
cap
piston
closure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82109534A
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German (de)
French (fr)
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EP0078936B1 (en
EP0078936A3 (en
Inventor
Emil Ing. Plaschka
Mathias Pauls
Guido Niggli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polypag AG
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Polypag AG
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Priority claimed from DE19813147004 external-priority patent/DE3147004A1/en
Priority claimed from DE19813147006 external-priority patent/DE3147006A1/en
Application filed by Polypag AG filed Critical Polypag AG
Priority to AT82109534T priority Critical patent/ATE20025T1/en
Publication of EP0078936A2 publication Critical patent/EP0078936A2/en
Publication of EP0078936A3 publication Critical patent/EP0078936A3/en
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Publication of EP0078936B1 publication Critical patent/EP0078936B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/60—Contents and propellant separated
    • B65D83/64—Contents and propellant separated by piston
    • 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
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/40—Closure caps

Definitions

  • the invention relates to a pressure can for dispensing assembly foams, in particular one-component polyurethane foam, the frame of which has a cylinder, a preferably indented bottom and a dome-like upper part with a closure, into which a valve for dispensing the can filling consisting of a blowing agent and foaming agent is inserted.
  • Such pressure cans are generally filled with differently composed substances. These include sealants based on rubber oil, butyl, silicone-acrylate or other base materials.
  • sealants based on rubber oil, butyl, silicone-acrylate or other base materials.
  • the preferred field of application of the invention is that of polyurethane foams, which are used for sealing, filling, insulating, gluing and fastening can be used in particular in construction.
  • sheet steel pressure cans with special valves, which facilitate the processing of the can contents, are used for these substances, inter alia because of the considerable internal pressure.
  • Pressure cans of this type are known (DE-GM 77 10 802.2).
  • a filling is accommodated which, in the preferred field of application of the invention, consists on the one hand of the polyurethane prepolymer containing various formulation components, to about 60% and about 40% of the propellant gas.
  • Part of the propellant gas which is about 10%. of the entire filling is required as so-called "yeast" for the foam formation.
  • the remaining portions of the propellant serve as a means of transportation.
  • the recipe components separate. For this reason, intensive mixing must be brought about again shortly before processing by vigorous and long shaking. As far as the gas acts as a blowing agent, it evaporates after the foam emerges.
  • the foam yield is influenced by various factors. Depending on the type of foam, however, the foam yield is approx. 25 to a maximum of 30 liters with the 1 kg pressure cans. So far, it has also not been possible to significantly increase the foam yield. Rather, it is shown that about 5% of the polyurethane prepolymer remains unused in the can after it has been completely emptied of its propellant gas.
  • Pressure vessels are known for various purposes, including for the spraying of insecticidal and fungicidal liquids (GB-PS 746 895), in which on the one hand the contact of the propellant gas with the liquid to be dispensed and on the other hand the transfer of the propellant gas into the atmosphere through a flexible membrane prevents which forms a partition between a container part containing only propellant gas and a further container compartment which holds the liquid to be dispensed.
  • the membrane turns inside the liquid compartment under the pressure of the propellant gas and thereby displaces the liquid, which is consequently expelled from the container without the propellant gas.
  • this technique requires a complex overall structure of the pressure vessel, which is not portable with the usual substances of the type described in the introduction.
  • the branching off of the necessary propellant for the "yeast” then makes it difficult.
  • the invention has for its object to set up cans of the general structure described at the outset so that the transfer of the propellant gas into the atmosphere is restricted or completely prevented and the application technology is simplified.
  • this object is achieved in that the inside of the wall of the cylinder of the frame leads the shirt of an overhung piston which is overhung between the propellant or foaming agent filling housed in separate can spaces and that of the can bottom and a change Lichen lower length of the cylinder wall enclosed propellant gas space separates from the overlying, the foam-forming space, which is enclosed by the piston crown and the remaining length of the cylinder and the closure.
  • the foaming agent i.e. e.g. the polyurethane prepolymer is displaced from the initially larger space of the pressure cell as a result of the propellant pressure acting on the piston head as soon as the valve from which the foam emerges is opened.
  • the piston moves up along the cylinder wall.
  • Pressure medium can pass between the piston skirt and the cylinder wall into the foaming agent. It forms at least part of the "yeast" required. Another part can be introduced into the foaming agent when filling the pressure can.
  • the piston prevents the foaming agent from mixing with the pressure medium. Shaking the can before use is therefore no longer necessary. The quantity exiting is also no longer affected by the pressure medium.
  • Pressure fluid can only escape to a small extent and only when the piston has reached the upper end position. In this position of the piston, however, the foaming agent has already been completely emptied.
  • the invention therefore has the advantage that the passage of the propellant gas portion serving as a means of transport into the atmosphere is largely prevented, but that the foam yield can be increased considerably. In comparable cases, it is 50 to 60 1, the amount depends on the type of foam.
  • the invention also has the advantage that the new can can be processed in any position. So it does not need to be held vertically with the valve down during operation. This is particularly beneficial in the ceiling area and in hard-to-reach places in construction, for example when foaming floors.
  • the invention also allows the piston to be used to completely empty the foaming agent.
  • the invention provides, in particular, for the bottom of the piston to be provided with an indented center and frustoconical edge surfaces and to fit the dome-like upper part and the closure from the inside.
  • the foaming agent is filled from above into the still empty but already provided with the piston; the liquid pressure medium is introduced from the other side.
  • an embodiment of the invention which has a bottom flanged to the lower edge of the cylinder, which has a propellant fill opening which can be closed with a one-way valve.
  • a particularly simple embodiment of such a one-way valve is characterized by a plug made of an elastomeric material which is pressed into the bottom and which can be pierced with a filling needle. When the filling needle is withdrawn, the filling needle opening closes automatically.
  • valve body In the known pressure cell, the valve body is set up so that the amount of foam removed in each case can be dosed with the valve and also deep, narrow and hidden cavities can be filled directly from the pressure cell.
  • the tubular valve body can be tilted into this rubber body, as a result of which the seal is broken and the foam can escape through the tubular, projecting part of the valve body.
  • the frame In order to protect the outwardly projecting part of the valve body from being inadvertently tilted during transport and storage of the can, the frame must carry the cap, which is usually made of plastic.
  • the cap In general, such pressure cans are stored by the manufacturer, the dealer and the user for a time which cannot be precisely determined beforehand.
  • Certain foaming agents, particularly isocyanate tend to stick when exposed to atmospheric moisture.
  • the rubber seal allows air to diffuse through the valve body from the outside after a certain storage time, so that the contents of the can can no longer be applied when the valve is used.
  • the cap loosens and the part of the valve body protruding outwards is pushed. The foam that emerges in turn sticks to the valve and renders the contents of the can unusable.
  • the gas exchange of the cap space with the atmosphere is prevented until the can contents are used and the valve body is made inaccessible when the cap is intact.
  • the cap has a brim which is gas-tight around the closure edge, the inner rim of which holds an annular seal on the rim of the plate and has an axially blocking edge which can be removed with the aid of a handle attached to the cap.
  • the invention has the advantage that it uses the structural parts predetermined by the valve closure for the attachment and sealing of the cap. By crimping the cap brim, the plate rim can be used as a seat for the ring seal. This results in a great simplification and also a reduction in the cap size, since its diameter can practically be reduced to the diameter of the plate base. This simplification and material saving allows the implementation of the invention without any significant additional effort in spite of the considerable quantities with which such pressure cans have to be brought onto the market.
  • the cap has a cylindrical connecting part between the inner plate rim and the axially blocking rim. Since the axially locking cap edge is flanged inward only when the cap is crimped and previously forms part of the cylindrical portion of the brim, the cap can be simplified as a result.
  • the pressure cell shown has a frame, generally designated 1, which, according to the exemplary embodiment shown, consists of sheet steel.
  • the middle part consists of a cylinder 2, the lower end edge of which is flanged at 3 together with the edge 4 of a base 6 turned at 5.
  • the upper edge 7 of the cylinder 2 goes into a dome-like, i.e. frusto-conical upper part 8, whose edge 9 surrounding an opening shows a closure, generally designated 11.
  • This closure has a plate 10, the edge 13 is crimped around the edge 9.
  • the plate 10 has a central opening 40 in which a plug-shaped rubber seal 41 of a valve, generally designated 12, is accommodated.
  • the valve body denoted by 42 is tubular and closed at its inner end 43 with a plate which lies on the rubber seal under the influence of the internal pressure.
  • a piston In the cylinder 2, a piston, generally designated 14, is arranged overhung.
  • the piston skirt 15 carries at the cylinder wall, but the piston in a can sufficient play to without jamming in the direction of D to be movable osenachse sixteenth
  • the piston crown 17 closes with its underside 18 a variable lower length 19 of the cylinder 2.
  • the section 19 of the cylinder 2 surrounds a space 20 which is filled with the propellant and is closed off from the can base 6 to the outside.
  • the propellant is filled with the aid of a filling needle, not shown, via a radial opening 21 of a valve neck in the can bottom and a valve rubber ring 22 which is placed around the valve neck.
  • the piston floats on the filling of the propellant gas space 20 and on the liquid foaming agent which is located in the space 23 above the piston head 17. This space is enclosed by the remaining length 24 of the cylinder 2, the dome 8 and the closure 11.
  • the piston crown is provided on its side facing the space 23 with an indented center 25 and has generally frustoconical edge surfaces 26 which, however, in the exemplary embodiment shown outwardly, i.e. are convex. Parts of the surfaces 25, 26 can strike the inside of the dome-like upper part or the closure as soon as the piston 14 has reached its upper end position.
  • the foaming agent is introduced into the can, which is initially open at the top, with a certain amount of propellant gas being added to the foaming agent, which later forms at least part of the yeast. After flanging the rim of the plate around the edge 9, the can is closed.
  • the valve insert 12 forms the when the The contents of the nozzle must be overcome by the user if necessary. However, such a seal can also leak against diffusing moisture for various reasons, in particular during a longer storage period. This would lead to reactions with the foaming agent in the area of the valve insert 12 and thus to sticking and ultimately clogging of the valve. Therefore, a double seal is provided, which is formed from the inner seal by the valve 12 and an outer seal by means of the cap 31 shown generally in FIGS. 2 and 3.
  • the cap 31 is made of sheet metal according to the illustrated embodiment and is generally tubular. Its bottom 30 is arranged so that the valve 12 of the inner seal is underneath.
  • the cap has a brim 32 which wraps around the closure 11, ie around the crimped edge of the plate 10 and therefore also around the edge 9 of the dome 8.
  • Under the inner edge 35 of the brim 32 is an annular rubber seal 36, which brings about the gas-tight closure of the interior of the cap 31 to the outside.
  • the brim 32 has an end edge 33 which lies under the plate rim and in this way axially blocks the cap 31. This edge 33 also delimits a tab 37 with a recess 38.
  • the tab 37 forms a handle, which is generally designated 34 and by means of which the cap 31 can be separated. For this purpose, the brim 32 is torn and separated using the handle 34.
  • the propellant can be introduced via the opening 21 and the valve rubber ring 22.
  • the liquid propellant flows through the filling needle and in this way gets under the piston crown.
  • the filling needle is withdrawn, as a result of which the one-way valve closes by itself under the influence of the propellant gas. Then the can is ready for use.
  • blowing agent can pass into the filling 23 in order to form at least part of the so-called "yeast" for the foam there.
  • the liquid filling 23 cannot pass into the propellant gas space 20 without prejudice to the respective position of the can.
  • the handle 34 is actuated on the spot by the user in the manner described. This frees the valve 12. If the valve is opened by tilting the plate 43, the piston 14 moves upward. In Fig. 1 the position of the piston is indicated, which it assumes when the can is about half empty. As soon as the valve 12 is closed, the piston 14 remains in the respective position in order to start moving again when the valve is opened again.

Abstract

Bei einer Druckdose zum Ausbringen von Montageschäumen, insbesondere Einkomponentenpolyurethanschaum, deren Zarge einen Zylinder, einen vorzugsweise eingestülpten Boden und ein domartiges Oberteil mit einem Verschluß aufweist, in den ein Ventil zum Ausbringen der aus einem Treibmittel und Schaumbildner bestehenden Dosenfüllung eingesetzt ist, wird zur Einschränkung des Übertrittes von Treibgas in die Atmosphäre und zur Erleichterung der Anwendungstechnik vorgeschlagen, daß sich innen an der Wand des Zylinders der Zarge das Hemd eines fliegend angeordneten Kolbens führt, der zwischen der in getrennten Dosenräumen untergebrachten Treibmittel- bzw. Schaumbildnerfüllung fliegend angeordnet ist und den von dem Dosenboden sowie einer veränderlichen unteren Länge der Zylinderwand umschlossenen Treibgasraum von dem darüber liegenden, den Schaumbildner aufnehmenden Raum trennt, der von dem Kolbenboden und der restlichen Länge des Zylinders und dem Verschluß umschlossen ist.In the case of a pressure can for dispensing assembly foams, in particular one-component polyurethane foam, the frame of which has a cylinder, a preferably indented bottom and a dome-like upper part with a closure, into which a valve for dispensing the can filling consisting of a blowing agent and foaming agent is inserted, to limit the Propagation of propellant gas in the atmosphere and to facilitate the application technology proposed that the inside of the wall of the cylinder of the frame leads the shirt of an overhung piston which is overhung between the propellant or foaming agent filling housed in separate can spaces and that of the Can bottom and a variable lower length of the cylinder wall enclosed propellant gas space from the overlying, the foam-forming space that is enclosed by the piston crown and the remaining length of the cylinder and the closure.

Description

Die Erfindung betrifft eine Druckdose zum Ausbringen von Montageschäumen, insbesondere von Einkomponentenpolyurethanschaum, deren Zarge einen Zylinder, einen vorzugsweise eingestülpten Boden und ein domartiges Oberteil mit einem Verschluß aufweist, in den ein Ventil zum Ausbringen der aus einem Treibmittel und Schaumbildner bestehenden Dosenfüllung eingesetzt ist.The invention relates to a pressure can for dispensing assembly foams, in particular one-component polyurethane foam, the frame of which has a cylinder, a preferably indented bottom and a dome-like upper part with a closure, into which a valve for dispensing the can filling consisting of a blowing agent and foaming agent is inserted.

Derartige Druckdosen werden im allgemeinen mit verschieden zusammengesetzten Stoffen gefüllt. Darunter befinden sich Dichtstoffe auf Kautschuk-öl, Butyl-, Silikon-Acrylatbasis bzw. anderen Basisstoffen. Das bevorzugte Anwendungsgebiet der Erfindung ist das der Polyurethanschäume, welche zum Dichten, Füllen, Isolieren, Kleben und Befestigen insbesondere im Bauwesen benutzt werden. Im allgemeinen verwendet man für diese Stoffe u.a. wegen des erheblichen Innendruckes Stahlblechdruckdosen mit besonderen Ventilen, die die Verarbeitung des Doseninhaltes erleichtern.Such pressure cans are generally filled with differently composed substances. These include sealants based on rubber oil, butyl, silicone-acrylate or other base materials. The preferred field of application of the invention is that of polyurethane foams, which are used for sealing, filling, insulating, gluing and fastening can be used in particular in construction. In general, sheet steel pressure cans with special valves, which facilitate the processing of the can contents, are used for these substances, inter alia because of the considerable internal pressure.

Druckdosen dieser Art sind bekannt (DE-GM 77 10 802.2). Im Inneren solcher Druckdosen wird eine Füllung untergebracht, die bei dem vorzugsweisen Anwendungsgebiet der Erfindung einerseits aus dem verschiedene Rezepturbestandteile aufweisenden Polyurethan-Präpolymer zu etwa 60 % und zu ca. 40 % aus dem Treibgas besteht. Ein Teil des Treibgases, der etwa 10 v.H. der gesamten Füllung ausmacht, wird als sogenannte "Hefe" für die Schaumbildung benötigt. Die restlichen Anteile des Treibgases dienen als Transportmittel. Wenn die Dose längere Zeit lagert, trennen sich erfahrungsgemäß die Rezepturbestandteile voneinander. Deswegen muß kurz vor der Verarbeitung durch kräftiges und langes Schütteln wieder eine intensive Vermischung herbeigeführt werden. Soweit das Gas als Treibmittel wirkt, verdampft es nach dem Schaumaustritt. Die Schaumausbeute wird von verschiedenen Faktoren beeinflußt. Je nach Schaumart beträgt jedoch die Schaumausbeute ca. 25 bis maximal 30 Liter bei den 1 kg Druckdosen. Bislang ist es auch nicht gelungen., die Schaumausbeute wesentlich zu steigern. Es zeigt sich vielmehr, daß ca. 5 % des Polyurethan-Präpolymers ungenutzt in der Dose zurückbleiben, nachdem diese vollständig von ihrem Treibgas entleert ist.Pressure cans of this type are known (DE-GM 77 10 802.2). In the interior of such pressure cans, a filling is accommodated which, in the preferred field of application of the invention, consists on the one hand of the polyurethane prepolymer containing various formulation components, to about 60% and about 40% of the propellant gas. Part of the propellant gas, which is about 10%. of the entire filling is required as so-called "yeast" for the foam formation. The remaining portions of the propellant serve as a means of transportation. Experience shows that when the can is stored for a long time, the recipe components separate. For this reason, intensive mixing must be brought about again shortly before processing by vigorous and long shaking. As far as the gas acts as a blowing agent, it evaporates after the foam emerges. The foam yield is influenced by various factors. Depending on the type of foam, however, the foam yield is approx. 25 to a maximum of 30 liters with the 1 kg pressure cans. So far, it has also not been possible to significantly increase the foam yield. Rather, it is shown that about 5% of the polyurethane prepolymer remains unused in the can after it has been completely emptied of its propellant gas.

Es sind Druckbehälter für verschiedene Zwecke bekannt, darunter für das Versprühen von insektiziden und fungiziden Flüssigkeiten (GB-PS 746 895), bei denen man einerseits die Berührung des Treibgases mit der auszubringenden Flüssigkeit und andererseits den übertritt des Treibgases in die Atmopshäre durch eine flexible Membrane verhindert, welche eine Trennwand zwischen einem ausschließlich Treibgas enthaltenden Behälterteil und einem weiteren, die auszubringende Flüssigkeit aufnehmenden Behälterabteil bildet. Die Membran stülpt sich bei geöffnetem Behälterverschluß unter dem Druck des Treibgases in das Flüssigkeitsabteil ein und verdrängt dabei aus diesem die Flüssigkeit, die folglich ohne das Treibgas aus dem Behälter ausgetrieben wird. Diese Technik bedingt jedoch einen aufwendigen Gesamtaufbau des Druckbehälters, der bei den üblichen Stoffen der eingangs bezeichneten Art nicht tragbar ist. Außerdem macht dann die Abzweigung des nötigen Treibgasanteiles für die "Hefe" Schwierigkeiten.Pressure vessels are known for various purposes, including for the spraying of insecticidal and fungicidal liquids (GB-PS 746 895), in which on the one hand the contact of the propellant gas with the liquid to be dispensed and on the other hand the transfer of the propellant gas into the atmosphere through a flexible membrane prevents which forms a partition between a container part containing only propellant gas and a further container compartment which holds the liquid to be dispensed. When the container closure is open, the membrane turns inside the liquid compartment under the pressure of the propellant gas and thereby displaces the liquid, which is consequently expelled from the container without the propellant gas. However, this technique requires a complex overall structure of the pressure vessel, which is not portable with the usual substances of the type described in the introduction. In addition, the branching off of the necessary propellant for the "yeast" then makes it difficult.

Der Erfindung liegt die Aufgabe zugrunde, Dosen des eingangs beschriebenen allgemeinen Aufbaus mit geringem Aufwand so einzurichten, daß der Übertritt des Treibgases in die Atmosphäre eingeschränkt bzw. ganz verhindert und die Anwendungstechnik vereinfacht wird.The invention has for its object to set up cans of the general structure described at the outset so that the transfer of the propellant gas into the atmosphere is restricted or completely prevented and the application technology is simplified.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß sich innen an der Wand des Zylinders der Zarge das Hemd eines fliegend angeordneten Kolbens führt, der zwischen der in getrennten Dosenräumen untergebrachten Treibmittel- bzw. Schaumbildnerfüllung fliegend angeordnet ist und den von dem Dosenboden sowie einer veränderlichen unteren Länge der Zylinderwand umschlossenen Treibgasraum von dem darüber liegenden, den Schaumbildner aufnehmenden Raum trennt, der von dem Kolbenboden und der restlichen Länge des Zylinders und dem Verschluß umschlossen ist.According to the invention, this object is achieved in that the inside of the wall of the cylinder of the frame leads the shirt of an overhung piston which is overhung between the propellant or foaming agent filling housed in separate can spaces and that of the can bottom and a change Lichen lower length of the cylinder wall enclosed propellant gas space separates from the overlying, the foam-forming space, which is enclosed by the piston crown and the remaining length of the cylinder and the closure.

Gemäß der Erfindung wird der Schaumbildner, d.h. z.B. das Polyurethan-Präpolymer aus dem anfangs größeren Raum der Druckdose infolge des auf den Kolbenboden anstehenden Treibmitteldruckes verdrängt, sobald das Ventil geöffnet wird, aus dem der Schaum austritt. Dabei wandert der Kolben längs der Zylinderwand nach oben. Dabei kann Druckmittel zwischen Kolbenhemd und Zylinderwand in den Schaumbildner übertreten. In diesem bilden es mindestens einen Teil der erforderlichen "Hefe". Ein anderer Teil kann beim Füllen der Druckdose in den Schaumbildner eingebracht werden. Andererseits wird durch den Kolben eine Vermischung des Schaumbildners mit dem Druckmittel verhindert. Ein Schütteln der Dose vor der Anwendung ist deswegen nicht mehr erforderlich. Auch die austretende Menge wird durch das Druckmittel nicht mehr beeinträchtigt. Druckmittel kann nur in geringem Umfang und erst dann austreten, wenn der Kolben die obere Endstellung erreicht hat. In dieser Stellung des Kolbens ist aber bereits eine vollständige Entleerung des Schaumbildners erreicht.According to the invention, the foaming agent, i.e. e.g. the polyurethane prepolymer is displaced from the initially larger space of the pressure cell as a result of the propellant pressure acting on the piston head as soon as the valve from which the foam emerges is opened. The piston moves up along the cylinder wall. Pressure medium can pass between the piston skirt and the cylinder wall into the foaming agent. It forms at least part of the "yeast" required. Another part can be introduced into the foaming agent when filling the pressure can. On the other hand, the piston prevents the foaming agent from mixing with the pressure medium. Shaking the can before use is therefore no longer necessary. The quantity exiting is also no longer affected by the pressure medium. Pressure fluid can only escape to a small extent and only when the piston has reached the upper end position. In this position of the piston, however, the foaming agent has already been completely emptied.

Die Erfindung hat deswegen den Vorteil, daß der Übertritt des als Transportmittel dienenden Treibgasanteiles in die Atmosphäre weitgehend verhindert wird, daß sich aber anderersetis die Schaumausbeute erheblich steigern läßt. Sie liegt in vergleichbaren Fällen bei 50 bis 60 1, wobei die jeweilige Menge von der Schaumart abhängt. Die Erfindung hat ferner den Vorteil, daß die neue Dose in jeder Stellung verarbeitet werden kann. Sie braucht also während der Funktion nicht senkrecht mit dem Ventil nach unten gehalten zu werden. Das wirkt sich insbesondere im Deckenbereich und an schwer zugänglichen Stellen im Bauwesen, z.B. beim Ausschäumen von Fußböden günstig aus.The invention therefore has the advantage that the passage of the propellant gas portion serving as a means of transport into the atmosphere is largely prevented, but that the foam yield can be increased considerably. In comparable cases, it is 50 to 60 1, the amount depends on the type of foam. The invention also has the advantage that the new can can be processed in any position. So it does not need to be held vertically with the valve down during operation. This is particularly beneficial in the ceiling area and in hard-to-reach places in construction, for example when foaming floors.

Die Erfindung gestattet auch die Ausnutzung des Kolbens zur vollständigen Entleerung des Schaumbildners. Zu diesem Zweck ist insbesondere erfindungsgemäß vorgesehen, den Boden des Kolbens mit einer eingestülpten Mitte und kegelstumpfförmigen Randflächen zu versehen und dem domartigen Oberteil sowie des Verschlusses von innen anzulegen.The invention also allows the piston to be used to completely empty the foaming agent. For this purpose, the invention provides, in particular, for the bottom of the piston to be provided with an indented center and frustoconical edge surfaces and to fit the dome-like upper part and the closure from the inside.

In die noch leere, jedoch bereits mit dem Kolben versehene Druckdose wird von oben der Schaumbildner eingefüllt; von der anderen Seite bringt man das flüssige Druckmittel ein. Dafür empfiehlt sich eine Ausführungsform der Erfindung, welche einen an den unteren Rand des Zylinders angebördelten Boden aufweist, der eine mit einem Einwegventil verschließbare Treibmitteleinfüllöffnung aufweist. Eine besonders einfache Ausführungsform eines solchen Einwegventiles kennzeichnet sich durch einen in den Boden eingepreßten Stopfen aus einem elastomeren Werkstoff, der mit einer Füllnadel durchstoßbar ist. Wenn die Füllnadel zurückgezogen wird, verschließt sich die Füllnadelöffnung von selbst.The foaming agent is filled from above into the still empty but already provided with the piston; the liquid pressure medium is introduced from the other side. For this purpose, an embodiment of the invention is recommended which has a bottom flanged to the lower edge of the cylinder, which has a propellant fill opening which can be closed with a one-way valve. A particularly simple embodiment of such a one-way valve is characterized by a plug made of an elastomeric material which is pressed into the bottom and which can be pierced with a filling needle. When the filling needle is withdrawn, the filling needle opening closes automatically.

Bei der vorbekannten Druckdose ist der Ventilkörper so eingerichtet, daß die jeweils entnommene Schaummenge mit dem Ventil dosiert werden kann und auch tiefe, schmale und verdeckte Hohlräume unmittelbar aus der Druckdose verfüllt werden können. Das macht eine besondere Bauart des Ventilkörpers erforderlich, der mit einer Gummidichtung gegen den Teller abgedichtet sein muß. In diesen Gummikörper läßt sich der rohrförmige Ventilkörper verkippen, wodurch die Abdichtung aufgehoben und der Schaum durch den rohrförmigen, außen vorstehenden Teil des Ventilkörpers austreten kann.In the known pressure cell, the valve body is set up so that the amount of foam removed in each case can be dosed with the valve and also deep, narrow and hidden cavities can be filled directly from the pressure cell. This requires a special design of the valve body, which must be sealed against the plate with a rubber seal. The tubular valve body can be tilted into this rubber body, as a result of which the seal is broken and the foam can escape through the tubular, projecting part of the valve body.

Um den nach außen vorstehenden Teil des Ventilkörpers davor zu schützen, daß er während des Transportes und der Lagerung der Dose unbeabsichtigt verkippt wird, muß die Zarge die meistens aus Kunststoff bestehende Kappe tragen. Im allgemeinen werden solche Druckdosen nämlich beim Hersteller, beim Händler und beim Anwender eine vorher nicht genau festlegbare Zeit gelagert. Bestimmte Schaumbildner, insbesondere Isozyanat, neigen beim Zutritt von Luftfeuchtigkeit zum Verkleben. Die Gummidichtung läßt erfahrungsgemäß nach einer bestimmten Lagerzeit von außen durch den Ventilkörper Luftfeuchtigkeit eindiffundieren, so daß bei der Anwendung der Doseninhalt nicht mehr ausgebracht werden kann. Bei der Lagerung und/oder beim Transport kommt es auch vor, daß die Kappe sich lockert und der nach außen vorstehende Teil des Ventilkörpers angestoßen wird. Der dann austretende Schaum verklebt seinerseits das Ventil und macht den Doseninhalt unbrauchbar.In order to protect the outwardly projecting part of the valve body from being inadvertently tilted during transport and storage of the can, the frame must carry the cap, which is usually made of plastic. In general, such pressure cans are stored by the manufacturer, the dealer and the user for a time which cannot be precisely determined beforehand. Certain foaming agents, particularly isocyanate, tend to stick when exposed to atmospheric moisture. Experience has shown that the rubber seal allows air to diffuse through the valve body from the outside after a certain storage time, so that the contents of the can can no longer be applied when the valve is used. During storage and / or transport, it also happens that the cap loosens and the part of the valve body protruding outwards is pushed. The foam that emerges in turn sticks to the valve and renders the contents of the can unusable.

Um wenigstens das Eindiffundieren von Feuchtigkeit zu verhindern, ist es bekannt, auf der Innenseite des Dosenbodens ein Trockenmittel vorzusehen, welches die unter die Kappe eingedrunqene Luftfeuchtigkeit aufnimmt. In der Praxis zeigt sich jedoch, daß die Art und die Menge des Trockenmittels nicht ausreicht, um bei den durchschnittlichen Lagerzeiten Verluste durch eindiffundierende Luftfeuchtigkeit zu verhindern. Außerdem können solche Kappen das Austreten von Schaum durch die im Ventilkörper bei undicht werdender Abdichtung ebenso wenig verhindern, wie die unbeabsichtigte oder mißbräuchliche Betätigung des Ventils.In order to at least prevent the diffusion of moisture, it is known to provide a desiccant on the inside of the can base, which the absorbs moisture that has penetrated under the cap. In practice, however, it has been shown that the type and amount of the desiccant is not sufficient to prevent losses due to diffusing air humidity during the average storage times. In addition, such caps cannot prevent foam from escaping due to the seal becoming leaky in the valve body, just as little as the unintentional or improper operation of the valve.

Gemäß einer zweckmäßigen Ausführungsart der Erfindung wird bis zur Anwendung des Doseninhalts der Gasaustausch des Kappenraumes mit der Atmosphäre verhindert und der Ventilkörper bei intakter Kappe unzugänglich gemacht. Dazu ist vorgesehen, daß die Kappe eine sich gasdicht um den Verschlußrand legende Krempe aufweist, deren innerer Bordrand eine Ringdichtung auf dem Tellerrand hält und einen die Kappe axial versperrenden Rand aufweist, der mit Hilfe einer an der Kappe angebrachten Handhabe abtrennbar ist.According to an expedient embodiment of the invention, the gas exchange of the cap space with the atmosphere is prevented until the can contents are used and the valve body is made inaccessible when the cap is intact. For this purpose, it is provided that the cap has a brim which is gas-tight around the closure edge, the inner rim of which holds an annular seal on the rim of the plate and has an axially blocking edge which can be removed with the aid of a handle attached to the cap.

Dadurch wird eine doppelte Abdichtung gegen eindiffundierende Luftfeuchtigkeit geschaffen, weil die mit der Kappe und ihrer Krempe eingeschlossene Luft mit der Ventildichtung gegen den Doseninhalt abgesperrt ist, während die Krempendichtung die eingeschlossene Luft gegen die Atmosphäre abschließt. Deshalb ist die eindiffundierbare Luftfeuchtigkeitsmenge so stark reduziert, daß der Verschluß gegen Blockieren und Verkleben gesichert ist. Andererseits läßt sich die Kappe nur durch Zerstörung ihrer Krempe entfernen. Das kann unbeabsichtigt nicht erfolgen. Folglich kann man bei beschädigter Krempe Mißbräuche erkennen.This creates a double seal against diffusing air humidity because the air enclosed with the cap and its brim is sealed off from the contents of the can by the valve seal, while the brim seal seals the enclosed air against the atmosphere. Therefore, the diffusible amount of humidity is reduced so much that the closure is secured against blocking and sticking. On the other hand, the cap can only be removed by destroying its brim. This cannot happen unintentionally. As a result, if damaged Detect brim abuses.

Die Erfindung hat den Vorteil, daß sie die durch den Ventilverschluß vorgegebenen Konstruktionsteile für die Anbringung und Abdichtung der Kappe ausnutzt. Durch Krimpen der Kappenkrempe läßt sich der Tellerrand als Sitz für die Ringdichtung ausnutzen. Dadurch ergibt sich eine starke Vereinfachung sowie außerdem eine Verminderung der Kappengröße, da sich deren Durchmesser praktisch auf den Durchmesser des Tellerbodens reduzieren läßt. Diese Vereinfachung und Materialeinsparung erlaubt die Verwirklichung der Erfindung ohne nennenswerten Mehraufwand trotz der erheblichen Stückzahlen, mit denen solche Druckdosen auf den Markt gebracht werden müssen.The invention has the advantage that it uses the structural parts predetermined by the valve closure for the attachment and sealing of the cap. By crimping the cap brim, the plate rim can be used as a seat for the ring seal. This results in a great simplification and also a reduction in the cap size, since its diameter can practically be reduced to the diameter of the plate base. This simplification and material saving allows the implementation of the invention without any significant additional effort in spite of the considerable quantities with which such pressure cans have to be brought onto the market.

Bei einer weiteren Ausführungsform der Erfindung weist die Kappe zwischen dem inneren Tellerrand und dem sie axial versperrenden Rand ein zylindrisches Verbindungsteil auf. Da der axial versperrend wirkende Kappenrand erst beim Krimpen der Kappe nach innen umgebördelt wird und vorher einen Teil des zylindrischen Abschnittes der Krempe bildet, kann im Ergebnis die Kappe vereinfacht werden.In a further embodiment of the invention, the cap has a cylindrical connecting part between the inner plate rim and the axially blocking rim. Since the axially locking cap edge is flanged inward only when the cap is crimped and previously forms part of the cylindrical portion of the brim, the cap can be simplified as a result.

Die Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer Ausführungsform anhand der Figuren in der Zeichnung; es zeigen

  • Fig. 1 schematisch und unter Fortlassung aller für das Verständnis der Erfindung nicht erforderlichen Einzelheiten eine Druckdose gemäß der Erfindung teilweise im Schnitt,
  • Fig. 2 in vergrößerter Darstellung das obere Ende der Druckdose im Schnitt und
  • Fig. 3 eine Draufsicht auf den Gegenstand der Fig. 2.
The details of the invention result from the following description of an embodiment with reference to the figures in the drawing; show it
  • 1 schematically and omitting all details not necessary for understanding the invention, a pressure can according to the invention, partly in section,
  • F ig. 2 in an enlarged view the upper end of the pressure cell in section and
  • 3 is a top view of the subject of FIG. 2.

Die wiedergegebene Druckdose weist eine allgemein mit 1 bezeichnete Zarge auf, die gemäß dem dargestellten Ausführungsbeispiel aus Stahlblech besteht. Der Mittelteil besteht aus einem Zylinder 2, dessen untere Stirnkante bei 3 zusammen mit dem Rand 4 eines bei 5 eingestülpten Bodens 6 umgebördelt ist. Der obere Rand 7 des Zylinders 2 geht in ein domartiges, d.h. kegelstumpfartiges Oberteil 8 über, dessen eine öffnung umgebender Rand 9 einen allgemein mit 11 bezeichneten Verschluß zeigt. Dieser Verschluß hat einen Teller 10, dessen Rand 13 um den Rand 9 gekrimpt ist. Der Teller 10 weist eine mittlere öffnung 40 auf, in der eine stopfenförmige Gummidichtung 41 eines allgemein mit 12 bezeichneten Ventils untergebracht ist. Der mit 42 bezeichnete Ventilkörper ist rohrförmig und an seinem inneren Ende 43 mit einem Teller verschlossen, der sich unter dem Einfluß des Innendruckes auf die Gummidichtung legt. Unter dem Teller und innerhalb des nach außen abgedichteten Rohrteiles befinden sich eine oder mehrere öffnungen 44, durch die der Doseninhalt nach außen treten kann, sobald der Ventilkörper 42 verkippt und dadurch der Ventilteller 43 abgehoben wird.The pressure cell shown has a frame, generally designated 1, which, according to the exemplary embodiment shown, consists of sheet steel. The middle part consists of a cylinder 2, the lower end edge of which is flanged at 3 together with the edge 4 of a base 6 turned at 5. The upper edge 7 of the cylinder 2 goes into a dome-like, i.e. frusto-conical upper part 8, whose edge 9 surrounding an opening shows a closure, generally designated 11. This closure has a plate 10, the edge 13 is crimped around the edge 9. The plate 10 has a central opening 40 in which a plug-shaped rubber seal 41 of a valve, generally designated 12, is accommodated. The valve body denoted by 42 is tubular and closed at its inner end 43 with a plate which lies on the rubber seal under the influence of the internal pressure. There are one or more openings 44 under the plate and inside the tube part which is sealed off from the outside, through which the contents of the can can exit as soon as the valve body 42 is tilted and the valve plate 43 is thereby lifted off.

In dem Zylinder 2 ist ein allgemein mit 14 bezeichneter Kolben fliegend angeordnet. Das Kolbenhemd 15 führt sich an der Zylinderwand, jedoch hat der Kolben in der Dose genügend Spiel, um ohne Verklemmungen in Richtung der Dosenachse 16 beweglich zu sein.In the cylinder 2, a piston, generally designated 14, is arranged overhung. The piston skirt 15 carries at the cylinder wall, but the piston in a can sufficient play to without jamming in the direction of D to be movable osenachse sixteenth

Der Kolbenboden 17 verschließt mit seiner Unterseite 18 eine veränderlichte untere Länge 19 des Zylinders 2. Der Abschnitt 19 des Zylinders 2 umgibt einen Raum 20, der mit dem Treibmittel gefüllt ist und vom Dosenboden 6 nach außen abgeschlossen wird. Die Füllung des Treibmittels erfolgt mit Hilfe einer nicht dargestellten Füllnadel über eine radiale Öffnung 21 eines Ventilansatzes im Dosenboden und einen Ventilgummiring 22,der um den Ventilansatz gelegt ist.The piston crown 17 closes with its underside 18 a variable lower length 19 of the cylinder 2. The section 19 of the cylinder 2 surrounds a space 20 which is filled with the propellant and is closed off from the can base 6 to the outside. The propellant is filled with the aid of a filling needle, not shown, via a radial opening 21 of a valve neck in the can bottom and a valve rubber ring 22 which is placed around the valve neck.

Der Kolben schwimmt auf der Füllung des Treibgasraumes 20 und auf dem flüssigen Schaumbildner, der sich in dem Raum 23 oberhalb des Kolbenbodens 17 befindet. Dieser Raum wird von der restlichen Länge 24 des Zylinders 2, dem Dom 8 und dem Verschluß 11 umschlossen.The piston floats on the filling of the propellant gas space 20 and on the liquid foaming agent which is located in the space 23 above the piston head 17. This space is enclosed by the remaining length 24 of the cylinder 2, the dome 8 and the closure 11.

Gemäß dem dargestellten Ausführungsbeispiel ist der Kolbenboden auf seiner dem Raum 23 zugekehrten Seite mit einer eingestülpten Mitte 25 versehen und hat allgemein kegelstumpfförmige Randflächen 26, die jedoch bei dem dargestellten Ausführungsbeispiel nach außen, d.h. konvex gewölbt sind. Teile der Flächen 25, 26 können von innen an dem domartigen Oberteil bzw. an dem Verschluß anschlagen, sobald der Kolben 14 seine obere Endstellung erreicht hat.According to the exemplary embodiment shown, the piston crown is provided on its side facing the space 23 with an indented center 25 and has generally frustoconical edge surfaces 26 which, however, in the exemplary embodiment shown outwardly, i.e. are convex. Parts of the surfaces 25, 26 can strike the inside of the dome-like upper part or the closure as soon as the piston 14 has reached its upper end position.

In die zunächst oben offene Dose wird der Schaumbildner eingebracht, wobei man dem Schaumbildner eine gewisse Menge an Treibgas zusetzt, welche später wenigstens einen Teil der Hefe bildet. Nach Umbördeln des Tellerrandes um den Rand 9 ist die Dose verschlossen. Der Ventileinsatz 12 bildet die bei der Anwendung des Doseninhaltes vom Anwender bedarfsweise zu überwindende innere Abdichtung. Eine solche Abdichtung kann aber auch aus verschiedenen Gründen insbesondere während einer längeren Lagerzeit undicht gegen eindiffundierende Feuchtigkeit werden. Das würde zu Reaktionen mit dem Schaumbildner im Bereich des Ventileinsatzes 12 und damit zu einem Verkleben und schließlichem Verstopfen des Ventiles führen. Deswegen ist eine doppelte Abdichtung vorgesehen, die aus der inneren Abdichtung durch das Ventil 12 und einer äußeren Abdichtung mit Hilfe der in den Figuren 2 und 3 allgemein wiedergegebenen Kappe 31 gebildet wird. Die Kappe 31 besteht gemäß dem dargestellten Ausführungsbeispiel aus Blech und ist allgemein rohrförmig. Ihr Boden 30 ist so angeordnet, daß darunter das Ventil 12 der inneren Abdichtung liegt. Die Kappe weist eine Krempe 32 auf, die sich um den Verschluß 11, d.h. um den gekrimpten Rand des Tellers 10 und deswegen auch um den Rand 9 des Domes 8 legt. Unter dem inneren Rand 35 der Krempe 32 liegt eine ringförmige Gummidichtung 36, welche den gasdichten Abschluß des Innenraumes der Kappe 31 nach außen herbeiführt.The foaming agent is introduced into the can, which is initially open at the top, with a certain amount of propellant gas being added to the foaming agent, which later forms at least part of the yeast. After flanging the rim of the plate around the edge 9, the can is closed. The valve insert 12 forms the when the The contents of the nozzle must be overcome by the user if necessary. However, such a seal can also leak against diffusing moisture for various reasons, in particular during a longer storage period. This would lead to reactions with the foaming agent in the area of the valve insert 12 and thus to sticking and ultimately clogging of the valve. Therefore, a double seal is provided, which is formed from the inner seal by the valve 12 and an outer seal by means of the cap 31 shown generally in FIGS. 2 and 3. The cap 31 is made of sheet metal according to the illustrated embodiment and is generally tubular. Its bottom 30 is arranged so that the valve 12 of the inner seal is underneath. The cap has a brim 32 which wraps around the closure 11, ie around the crimped edge of the plate 10 and therefore also around the edge 9 of the dome 8. Under the inner edge 35 of the brim 32 is an annular rubber seal 36, which brings about the gas-tight closure of the interior of the cap 31 to the outside.

Die Krempe 32 weist einen Endrand 33 auf, der sich unter den Tellerrand legt und auf diese Weise die Kappe 31 axial versperrt. Dieser Rand 33 begrenzt auch einen Lappen 37 mit einer Aussparung 38. Der Lappen 37 bildet eine Handhabe, die allgemein mit 34 bezeichnet ist und mit deren Hilfe die Kappe 31 abgetrennt werden kann. Zu diesem Zweck wird mit Hilfe der Handhabe 34 die Krempe 32 eingerissen und abgetrennt.The brim 32 has an end edge 33 which lies under the plate rim and in this way axially blocks the cap 31. This edge 33 also delimits a tab 37 with a recess 38. The tab 37 forms a handle, which is generally designated 34 and by means of which the cap 31 can be separated. For this purpose, the brim 32 is torn and separated using the handle 34.

Nachdem der Schaumbildner eingefüllt ist, kann mit Hilfe der beschriebenen und innen hohlen Füllnadel das Treibmittel über die Öffnung 21 und den Ventilgummiring 22 eingebracht werden. Das flüssige Treibmittel durchströmt die Füllnadel und gelangt auf diese Weise unter den Kolbenboden. Nach Erreichen des erforderlichen Druckes im Treibgasraum 20 wird die Füllnadel zurückgezogen, wodurch sich das Einwegventil unter dem Einfluß des Treibgases von selber schließt. Dann ist die Dose betriebsbereit.After the foaming agent has been filled in, use of the described and internally hollow filling needle, the propellant can be introduced via the opening 21 and the valve rubber ring 22. The liquid propellant flows through the filling needle and in this way gets under the piston crown. After the required pressure in the propellant gas space 20 has been reached, the filling needle is withdrawn, as a result of which the one-way valve closes by itself under the influence of the propellant gas. Then the can is ready for use.

Zwischen Kolbenhemd 15 und Zylinderwand 2 kann Treibmittel in die Füllung 23 übertreten, um dort wenigstens einen Teil der sogenannten "Hefe" für den Schaum zu bilden. Andererseits kann die flüssige Füllung 23 nicht in den Treibgasraum 20 übertreten unbeschadet der jeweiligen Lage der Dose.Between the piston skirt 15 and the cylinder wall 2, blowing agent can pass into the filling 23 in order to form at least part of the so-called "yeast" for the foam there. On the other hand, the liquid filling 23 cannot pass into the propellant gas space 20 without prejudice to the respective position of the can.

Vom Anwender wird die Handhabe 34 in der beschriebenen Weise an Ort und Stelle betätigt. Dadurch wird das Ventil 12 frei. Wird durch Verkippen des Tellers 43 das Ventil geöffnet, so wandert der Kolben 14 nach oben. In der Fig. 1 ist die Stellung des Kolbens angedeutet, die diese einnimmt, wenn die Dose etwa halb entleert ist. Sobald das Ventil 12 geschlossen wird, bleibt der Kolben 14 in der jeweiligen Stellung stehen, um sich bei erneutem Öffnen des Ventils wieder in Bewegung zu setzen.The handle 34 is actuated on the spot by the user in the manner described. This frees the valve 12. If the valve is opened by tilting the plate 43, the piston 14 moves upward. In Fig. 1 the position of the piston is indicated, which it assumes when the can is about half empty. As soon as the valve 12 is closed, the piston 14 remains in the respective position in order to start moving again when the valve is opened again.

Schließlich erreicht der Kolben seine obere Endstellung, in der er am Dom 8 bzw. an der Verschlußklappe 11 anschlägt. Treibgas drängt sich dann zwischen Kolbenhemd 15 und Zylinderwand 2 infolge des Kolbenspieles hindurch und drückt das im stark verkleinerten bzw. ganz geschlossenen Raum 23 noch enthaltene flüssige Mittel durch das Ventil 12 nach außen, so daß die Dose vollständig entleert wird. Die durch das Ventil 12 nach der Entleerung der Dose austretende Treibgasmenge ist sehr gering. Praktisch wird daher das gesamte, für den Transport benötigte Treibgas in der Dose zurückgehalten.Finally, the piston reaches its upper end position, in which it strikes the dome 8 or the closure flap 11. Propellant then presses between the piston skirt 15 and cylinder wall 2 as a result of the piston play and presses it in a greatly reduced or completely closed manner Senen room 23 still contained liquid agent through the valve 12 to the outside, so that the can is completely emptied. The amount of propellant gas exiting through the valve 12 after the can has been emptied is very small. Practically all of the propellant gas required for transport is therefore retained in the can.

Claims (10)

l. Druckdose zum Ausbringen von Montageschäumen, insbesondere Einkomponentenpolyurethanschaum, deren Zarge einen Zylinder, einen vorzugsweise eingestülpten Boden und ein domartiges Oberteil mit einem Verschluß aufweist, in den ein Ventil zum Ausbringen der aus einem Treibmittel und Schaumbildner bestehenden Dosenfüllung eingesetzt ist , dadurch gekennzeichnet, daß sich innen an der Wand des Zylinders (2) der Zarge (1) das Hemd (15) eines fliegend angeordneten Kolbens (14) führt, der zwischen der in getrennten Dosenräumen (20, 23) untergebrachten Treibmittel- bzw. Schaumbildnerfüllung fliegend angeordnet ist und den von dem Dosenboden (6) sowie einer veränderlichen unteren Länge (19) der Zylinderwand umschlossenen Treibgasraum (20) von dem darüber liegenden, den Schaumbildner aufnehmenden Raum (23) trennt, der von dem Kolbenboden und der restlichen Länge (24) des Zylinders (2) sowie dem Dom (8) und den Verschluß (11) umschlossen ist.l. Pressure can for dispensing assembly foams, in particular one-component polyurethane foam, the frame of which has a cylinder, a preferably indented bottom and a dome-like upper part with a closure, into which a valve for dispensing the can filling consisting of a blowing agent and foaming agent is inserted, characterized in that inside on the wall of the cylinder (2) of the frame (1) leads the shirt (15) of an overhung piston (14), which is arranged flying between the propellant or foaming agent filling housed in separate can spaces (20, 23) and that of separates the can bottom (6) and a variable lower length (19) of the cylinder wall enclosed propellant gas space (20) from the overlying space (23) which receives the foaming agent and separates from the piston crown and the remaining length (24) of the cylinder (2) and the dome (8) and the closure (11) is enclosed. 2. Druckdose nach Anspruch 1 , dadurch gekennzeichnet , daß der Kolbenboden (15) eine eingestülpte Mitte (25) und allgemein der Kontur des Dosendomes entsprechende Randflächen (26) aufweist, mit denen der Kolben (14) in der oberen Endstellung an dem domartigen Oberteil (8) und/oder an dem Verschluß (11) von innen anschlägt.2. Pressure can according to claim 1, characterized in that the piston head (15) has an inserted p te center (25) and generally corresponding to the contour of the can dome edge surfaces (26) with which the piston (14) in the upper end position on the dome-like upper part (8) and / or on the closure (11) from the inside. 3. Druckdose nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet , daß die Randflächen (26) nach außen und oben gewölbt sind.3. Pressure can according to one of claims 1 or 2, characterized in that the edge surfaces (26) are curved outwards and upwards. 4. Druckdose nach einem der Ansprüche 1 bis 3, gekennzeichnet durch einen Wulst (28) und Ringnuten (29) im Kolbenhemd (15).4. Pressure can according to one of claims 1 to 3, characterized by a bead (28) and annular grooves (29) in the piston skirt (15). 5. Druckdose nach einem der Ansprüche 1 bis 4, gekennzeichnet durch einen an den unteren Rand (3) des Zylinders (2) angebördelten Boden (6), der eine mit einem Einweg-Ventil (22) verschließbare Treibmitteleinfüllöffnung (21) aufweist.5. Pressure can according to one of claims 1 to 4, characterized by a on the lower edge (3) of the cylinder (2) flanged bottom (6) which has a propellant filler opening (21) which can be closed with a one-way valve (22). 6. Druckdose nach Anspruch 5 , dadurch gekennzeichnet , daß das im Boden (6) angeordnete Ventil (22) als Einwegventil ausgebildet ist.6. Pressure can according to claim 5, characterized in that the valve (22) arranged in the bottom (6) is designed as a one-way valve. 7. Druckdose nach Anspruch 6 , dadurch gekennzeichnet , daß das Einwegventil (22) ein in den Boden (6) eingepreßter Stopfen aus elastomerem Werkstoff ist, der mit einer Füllnadel durchstoßbar ist.7. A pressure can according to claim 6, characterized in that the one-way valve (22) is a plug made of elastomeric material which is pressed into the bottom (6) and can be pierced with a filling needle. 8. Druckdose nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet , daß das Ventil (12) unter dem Boden (30) einer Kappe (31) angeordnet ist, welche eine sich gasdicht um den Verschluß (11) legende Krempe (32) aufweist, deren die Kappe (31) axial versperrender Rand (33) mit Hilfe einer an der Kappe angebrachten Handhabe (34) abtrennbar ist.8. Pressure can according to one of claims 1 to 7, characterized in that the valve (12) under the bottom (30) of a cap (31) is arranged which has a gas-tight around the closure (11) laying brim (32) , the cap (31) axially blocking edge (33) can be separated with the aid of a handle (34) attached to the cap. 9. Druckdose nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Kappe (31) eine sich gasdicht um den Verschlußrand legende Krempe (32) aufweist, deren innerer Bordrand (35) eine Ringdichtung (36) auf dem Tellerrand hält und einen die Kappe (31) axial versperrenden Rand (33) aufweist, der mit Hilfe einer an der Kappe (31) angebrachten Handhabe (34) abtrennbar ist.9. A pressure can according to one of claims 1 to 8, characterized in that the cap (31) has a brim (32) which lies gas-tight around the closure edge, the inner rim (35) of which holds an annular seal (36) on the plate rim and one the cap (31) has an axially blocking edge (33) which can be separated with the aid of a handle (34) attached to the cap (31). 10. Druckdose nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet , daß die Krempe (32) ein an dem inneren Bordrand (35) und dem axial versperrenden Rand (33) angeordnetes zylindrisches Verbindungsstück (39) aufweist.10. Pressure can according to one of claims 1 to 9, characterized in that the brim (32) on the inner rim (35) and the axially blocking edge (33) arranged cylindrical connector (39).
EP82109534A 1981-11-06 1982-10-15 Pressured container for delivering assembly foam, especially one-component polyurethane foam Expired EP0078936B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82109534T ATE20025T1 (en) 1981-11-06 1982-10-15 PRESSURE CAN FOR DEPLOYING INSTALLATION FOAM, ESPECIALLY ONE-COMPONENT POLYURETHANE FOAM.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE3144094 1981-11-06
DE3144094 1981-11-06
DE19813147004 DE3147004A1 (en) 1981-11-06 1981-11-27 Pressure capsule for delivering assembly foams, in particular one-component polyurethane foam
DE3147006 1981-11-27
DE3147004 1981-11-27
DE19813147006 DE3147006A1 (en) 1981-11-27 1981-11-27 Pressure capsule for delivering assembly foams, in particular one-component polyurethane foam

Publications (3)

Publication Number Publication Date
EP0078936A2 true EP0078936A2 (en) 1983-05-18
EP0078936A3 EP0078936A3 (en) 1984-02-22
EP0078936B1 EP0078936B1 (en) 1986-05-28

Family

ID=27189678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109534A Expired EP0078936B1 (en) 1981-11-06 1982-10-15 Pressured container for delivering assembly foam, especially one-component polyurethane foam

Country Status (5)

Country Link
US (1) US4508244A (en)
EP (1) EP0078936B1 (en)
CA (1) CA1205431A (en)
DE (1) DE3271416D1 (en)
DK (1) DK160933C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0655394A1 (en) * 1993-11-25 1995-05-31 Rathor Ag Pressurized container
EP0801087A1 (en) * 1996-04-11 1997-10-15 Beiersdorf Aktiengesellschaft Moisture-curing one-component polyurethane composition for reversible covering of a solid base
WO1999062792A1 (en) 1998-06-03 1999-12-09 Ebb Ingenieurgesellschaft Multi-refillable spray can, device for filling said cans and method for producing said spray cans
EP2371738A1 (en) * 2010-03-29 2011-10-05 Soudal Improved disposable container

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4513889A (en) * 1982-12-27 1985-04-30 Beard Walter C Reclosable valve with removable hermetic external seal means
US4469253A (en) * 1982-12-27 1984-09-04 Beard Walter C Reclosable valve with removable hermetic external seal means
NZ227284A (en) * 1987-12-22 1991-08-27 Abplanalp Robert H Extruded plastics container with ends of body portion heat sealed into recessed undercuts of the end panels
AU691484B2 (en) * 1993-02-10 1998-05-21 Rathor Ag Prepolymer composition for insulating foams
CN1126326A (en) * 1994-01-28 1996-07-10 苏州康瑞照相器材有限公司 Storage bag for keeping negatives in archives and its prodn. method
CN1325529C (en) * 1999-11-01 2007-07-11 深圳彩虹气雾剂制造有限公司 Single-component foam polyurethane material and its preparing process

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US2980299A (en) * 1958-06-09 1961-04-18 Smith Robert Archer Closure actuator
US3362589A (en) * 1966-06-23 1968-01-09 Continental Can Co Piston for aerosol can
DE1432447A1 (en) * 1960-10-18 1968-12-12 American Can Co Pressure spray device for viscous substances
US3927796A (en) * 1975-04-16 1975-12-23 Harvey B Whitehouse Container and closure therefor
FR2311593A1 (en) * 1975-05-23 1976-12-17 Gantzer Jean Louis Canister:type aerosol package - has valve in base with piston slidable in body and fitting against dome underside

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US2737416A (en) * 1953-03-24 1956-03-06 Leo J Behr Nonclog cap for spray dispensers
US2809774A (en) * 1954-11-04 1957-10-15 Alf K Berle Pressure-feed device
US3262607A (en) * 1964-11-23 1966-07-26 Walter F Hirsch Safety closure cap for aerosol dispenser cans
US3273762A (en) * 1965-06-28 1966-09-20 Union Machine Company Pressure can construction including free piston
US3760987A (en) * 1971-06-02 1973-09-25 American Home Prod Snap assembled dispensing package and cover
US4253459A (en) * 1979-11-19 1981-03-03 Aluminum Company Of America Additive transfer unit with stabilized sealing means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2980299A (en) * 1958-06-09 1961-04-18 Smith Robert Archer Closure actuator
DE1432447A1 (en) * 1960-10-18 1968-12-12 American Can Co Pressure spray device for viscous substances
US3362589A (en) * 1966-06-23 1968-01-09 Continental Can Co Piston for aerosol can
US3927796A (en) * 1975-04-16 1975-12-23 Harvey B Whitehouse Container and closure therefor
FR2311593A1 (en) * 1975-05-23 1976-12-17 Gantzer Jean Louis Canister:type aerosol package - has valve in base with piston slidable in body and fitting against dome underside

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0655394A1 (en) * 1993-11-25 1995-05-31 Rathor Ag Pressurized container
EP0801087A1 (en) * 1996-04-11 1997-10-15 Beiersdorf Aktiengesellschaft Moisture-curing one-component polyurethane composition for reversible covering of a solid base
WO1999062792A1 (en) 1998-06-03 1999-12-09 Ebb Ingenieurgesellschaft Multi-refillable spray can, device for filling said cans and method for producing said spray cans
EP2371738A1 (en) * 2010-03-29 2011-10-05 Soudal Improved disposable container
BE1020139A3 (en) * 2010-03-29 2013-05-07 Soudal IMPROVED DISPOSAL CONTAINER.

Also Published As

Publication number Publication date
DK160933B (en) 1991-05-06
US4508244A (en) 1985-04-02
EP0078936B1 (en) 1986-05-28
CA1205431A (en) 1986-06-03
DK493482A (en) 1983-05-07
DK160933C (en) 1991-10-28
DE3271416D1 (en) 1986-07-03
EP0078936A3 (en) 1984-02-22

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