EP0432343B1 - Pressurized package - Google Patents

Pressurized package Download PDF

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Publication number
EP0432343B1
EP0432343B1 EP19900104896 EP90104896A EP0432343B1 EP 0432343 B1 EP0432343 B1 EP 0432343B1 EP 19900104896 EP19900104896 EP 19900104896 EP 90104896 A EP90104896 A EP 90104896A EP 0432343 B1 EP0432343 B1 EP 0432343B1
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EP
European Patent Office
Prior art keywords
pressure
hollow cylinder
product container
packaging according
gas
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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.)
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EP19900104896
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German (de)
French (fr)
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EP0432343A1 (en
Inventor
Berthold H. Dr. Daimler
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Dr Berthold H Daimler Te Remscheid Bondsrepubli
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Carl Freudenberg KG
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Priority to AT90104896T priority Critical patent/ATE101835T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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
    • B65D83/62—Contents and propellant separated by membrane, bag, or the like
    • 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
    • B65D83/0055—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents
    • B65D83/0061—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents the contents of a flexible bag being expelled by the contracting forces inherent in the bag or a sleeve fitting snugly around the bag

Definitions

  • the invention relates to a pressure pack for spraying a liquid from an essentially pressure-free compressible product container, the product container being enclosed by a one-way stretchable, elastically pre-stressed hollow cylinder made of rubber-elastic material and subjected to a pressure which is dependent on the filling state of the product container varies between a minimum pressure P min and a maximum pressure P max and a space is provided between the product container and the hollow cylinder.
  • Such a pressure pack is known from DE-A-31 32 906.
  • the hollow cylinder used here can only be expanded in the axial direction and is provided with a base which is designed to engage in a pot-like manner in the hollow cylinder in order to fill the dead volume.
  • the manufacture and assembly are accordingly complex.
  • the pressure drop resulting during the emptying of the pressure pack is very large and can result in changes in the spray formation which are intolerable. It is possible to reduce the pressure drop by increasing the applied preload relative to the maximum tension of the hollow cylinder when the product container is completely empty. In this case, however, you have to accept a loss of working stroke and thus a lower degree of filling, ie a reduced product quantity in relation to the hollow cylinder size.
  • Another pressure pack is known from US-A-4,077,543. It comprises a foldable product container, which is enclosed by an elastically tensionable hollow cylinder on the outer circumference side, the product container and the hollow cylinder being arranged in a housing made of metallic material.
  • the task that is to be solved by the previously known pressure pack is seen in the ease with which it can be filled.
  • To fill the pressure pack it is provided that the hollow cylinder is stretched in the axial direction until the product container has its largest possible volume within the housing. In this position, the hollow cylinder is locked so that the liquid can be filled into the product container without the pressure to expand the hollow cylinder having to be overcome. Before the intended use of the known pressure pack, the locking is released and the liquid contained in the product container is pressurized with the pressure P max.
  • the spray pressure is only dependent on the force exerted on the liquid inside the product container by the tensioned expansion element.
  • the tension on the liquid decreases with increasing emptying of the product container, so that there are undesirable changes in the spray behavior.
  • a complete emptying of the product container is not possible since the pressure on the liquid becomes too low shortly before the voltage reaches zero and because a liquid residue corresponding to the unextended length of the expansion element remains in the product container.
  • the invention has for its object to show a pressure can be used as a spray can, which is comparatively can be manufactured more easily and allows higher filling levels to be achieved and at the same time completely spray the liquid contained in the product container with a pressure which lies within the range of optimal spray formation defined by P min and P max.
  • the free space is hermetically sealed to the outside and, when the product container is emptied, is pre-stressed in the hollow cylinder with a gas which has approximately a positive pressure P min, the liquid being fed into the product container in such an amount that this is in the free space contained gas reached about the pressure P max. Due to the pressure-free deformability of the product container, the pressure prevailing in the free space is transferred without loss to the liquid to be sprayed therein. When the outlet valve of the product container is actuated, the liquid is therefore always available with a pressure which is between P min and P max. In this area, the liquid can be sprayed in an optimal manner. There is therefore no risk of undesired droplet formation at the outlet nozzle of the spray valve, either when the product container is completely full or when the emptying state is reached.
  • the dead space of the hollow cylinder is completely filled with a pressure gas cushion in the pressure pack according to the invention.
  • the elastic properties of the hollow cylinder are hereby supplemented in an advantageous manner.
  • the gas obtained in the pressure gas cushion suitably consists of argon or air. This makes special measures to achieve good environmental compatibility unnecessary.
  • the free space containing the prestressed gas is either filled with a diffusion-proof gas, for example with argon, or is separated from the surroundings by a gas-tight diffusion barrier.
  • a diffusion-proof gas for example with argon
  • This can be a coating made of a deformable material on the inside and / or outside of the hollow cylinder, for example one of the known sealing materials that are used in the tire industry.
  • a planter as a diffusion barrier, which surrounds the outside of the hollow cylinder.
  • the planter expediently consists of a metallic material and can at the same time serve to mark the contents or as an advertising medium.
  • the pressure P 10 should be such that the atmospheric pressure is at least reached when the product container is completely empty. Diffusion losses from the free space 3 can to a certain extent through the planter compensate because a pressure drop in the free space 3 is opposed by a pressure increase in the intermediate space 10. If the excess pressure which arises when filling the product container 1 or the free space 3 in the intermediate space 10 is undesirable, a valve provided in the wall of the planter can be actuated and the compressed air can be discharged. The valve then closes automatically, so that gas which diffuses from the free space 3 into the intermediate space 10 during storage leads there to the compensatory pressure increase. Before, on the other hand, a negative pressure can arise in the intermediate space 10 during rapid emptying, a compensation with the atmosphere occurs by automatically opening the valve.
  • FIG. 1 shows a pressure pack in longitudinal section, which is intended for spraying a liquid 4 from a product container 1 which can be compressed essentially without pressure.
  • the product container 1 is enclosed by a longitudinally stretchable, elastically prestressed hollow cylinder 2 made of rubber-elastic material, which is fastened to floors 6 in the region of its front ends.
  • a longitudinally stretchable, elastically prestressed hollow cylinder 2 made of rubber-elastic material, which is fastened to floors 6 in the region of its front ends.
  • These consist of deep-drawn, metallic molded parts, the upper part of which is used for fixing in a metallic planter 5.
  • the hollow cylinder 2 is reinforced in the area of its outside by a vertical spacing from one another, which is not expandable under normal operating conditions, metallic rings 7 and is coated with an elastically stretchable coating of butyl rubber, which serves as a diffusion barrier 8. This is deformable together with the hollow cylinder 2.
  • the free space 3 between the product container 1 and the hollow cylinder 2 is filled with air.
  • P min which, when the spray valve 9 is actuated, still permits optimal spraying of the liquid 4 contained in the product container 1 during normal use.
  • the pressure required in this regard depends on the type of liquid 4 to be sprayed. It can be determined using simple experiments.
  • the hollow cylinder 2 is enclosed on the outside by a planter 5 and connected to it in the region of the upper base.
  • the planter 5 is made of metallic material and is therefore both impermeable to diffusion and pressure-resistant.
  • the intermediate space 10 formed in this way is filled with air, which has the pressure P 10 when the product container is empty, which is at least as big as the pressure of the atmosphere.
  • the pressure of the gas contained in the intermediate space 10 is significantly higher.
  • the spring elasticity of the hollow cylinder 2 is thereby noticeably supported.
  • the excess pressure of the gas inside the hollow cylinder 2 guarantees a complete emptying of the product container 1 at the intended excess pressure P min.
  • Both the hollow cylinder 2, which can be deformed in one direction by means of reinforcement, and the product container 1 can have a different shape within the scope of the invention, as can the shape of the pressure pack as a whole.
  • openings with a valve function can be provided for adjusting the gas pressure in the free space 3 and also in the intermediate space 10.
  • the pressure vessel according to the invention can also be used for pasty products.
  • the achievable high degree of filling with a particularly low pressure difference between P max and P min is also an advantage and helps to ensure that the sprayed product strand is very uniform.

Abstract

A compressed gas container for spraying liquid from an essentially pressureless, compressable product receptacle which is enclosed by an elastically prestressed hollow cylinder made of elastomeric material. The hollow cylinder is able to expand in one direction only and is acted upon by a pressurized gas provided in a clearance space between the product receptacle and the hollow cylinder. The clearance space is hermetically sealed to the outside and is filled, while the product receptacle is empty, with the pressurized gas having a pressure of approximately Pmin. The liquid to be sprayed is fed into the product receptacle in such an amount that the gas contained in the free space reaches a pressure of approximately Pmax. The pressure of the gas in the free space varies, as a function of the amount of product in the product receptacle, between the minimum pressure Pmin and the maximum pressure Pmax.

Description

Die Erfindung betrifft eine Druckpackung zum Versprühen einer Flüssigkeit aus einem im wesentlichen drucklos zusammendrückbaren Produktbehälter, wobei der Produktbehälter von einem nur in einer Richtung dehnbaren, elastisch vorgespannten Hohlzylinder aus gummielastischem Werkstoff umschlossen und mit einem Druck beaufschlagt ist, der in Abhängigkeit von dem Füllungzustand des Produktbehälters zwischen einem Mindestdruck P min und einem Höchstdruck P max variiert und wobei zwischen dem Produktbehälter und dem Hohlzylinder ein Freiraum vorgesehen ist.The invention relates to a pressure pack for spraying a liquid from an essentially pressure-free compressible product container, the product container being enclosed by a one-way stretchable, elastically pre-stressed hollow cylinder made of rubber-elastic material and subjected to a pressure which is dependent on the filling state of the product container varies between a minimum pressure P min and a maximum pressure P max and a space is provided between the product container and the hollow cylinder.

Eine solche Druckpackung ist aus der DE-A-31 32 906 bekannt. Der dabei zur Anwendung gelangende Hohlzylinder ist nur in axialer Richtung dehnbar und mit einem Boden versehen, der zur Ausfüllung des Totvolumens topfartig in den Hohlzylinder eingreifend gestaltet ist. Die Herstellung und Montage sind dementsprechend aufwendig. Der sich während der Entleerung der Druckpackung ergebende Druckabfall ist jedoch sehr groß und kann eine Änderungen der Sprühnebelbildung zur Folge haben, die nicht tolerierbar ist. Es ist zwar möglich, den Druckabfall zu vermindern, in dem man die angewendete Vorspannung bei vollständig entleertem Produktbehälter relativ zur Maximalspannung des Hohlzylinders erhöht wird. In diesem Falle muß man aber einen Verlust an Arbeitshub und somit einen geringeren Füllgrad in Kauf nehmen, d.h. eine im Verhältnis zur Hohlzylindergröße reduzierte Produktmenge.Such a pressure pack is known from DE-A-31 32 906. The hollow cylinder used here can only be expanded in the axial direction and is provided with a base which is designed to engage in a pot-like manner in the hollow cylinder in order to fill the dead volume. The manufacture and assembly are accordingly complex. However, the pressure drop resulting during the emptying of the pressure pack is very large and can result in changes in the spray formation which are intolerable. It is possible to reduce the pressure drop by increasing the applied preload relative to the maximum tension of the hollow cylinder when the product container is completely empty. In this case, however, you have to accept a loss of working stroke and thus a lower degree of filling, ie a reduced product quantity in relation to the hollow cylinder size.

Eine weitere Druckpackung ist aus der US-A-4,077,543 bekannt. Sie umfaßt einen faltbaren Produktbehälter, der von einem elastisch spannbaren Hohlzylinder, außenumfangsseitig umschlossen ist, wobei der Produktbehälter und der Hohlzylinder in einem Gehäuse aus metallischem Werkstoff angeordnet sind. Die Aufgabe, die durch die vorbekannte Druckpackung gelöst werden soll, wird in der einfachen Befüllbarkeit gesehen. Zur Befüllung der Druckpackung ist es vorgesehen, daß der Hohlzylinder in axialer Richtung solange gedehnt wird, bis der Produktbehälter sein größtmögliches Volumen innerhalb des Gehäuses aufweist. In dieser Stellung wird der Hohlzylinder arretiert, so daß die Flüssigkeit in den Produktbehälter gefüllt werden kann, ohne daß der Druck zur Ausdehnung des Hohlzylinders überwunden werden muß. Vor der bestimmungsgemäßen Verwendung der vorbekannten Druckpackung wird die Arretierung gelöst und die im Produktbehälter enthaltene Flüssigkeit ist mit dem Druck P max beaufschlagt. Bei Betätigung der Druckpackung ist der Sprühdruck nur abhängig von der Kraft, die durch das gespannte Dehnelement auf die Flüssigkeit im Inneren des Produktbehälters ausgeübt wird. Die Spannung auf die Flüssigkeit nimmt mit zunehmender Entleerung des Produktbehälters immer weiter ab, so daß sich unerwünschte Änderungen im Sprühverhalten ergeben. Eine vollständige Entleerung des Produktbehälters ist nicht möglich, da der Druck auf die Flüssigkeit schon kurz vor der Erreichung der Spannung Null zu gering wird und da außerdem ein Flüssigkeitsrest entsprechend der ungedehnten Länge des Dehnelements in dem Produktbehälter verbleibt.Another pressure pack is known from US-A-4,077,543. It comprises a foldable product container, which is enclosed by an elastically tensionable hollow cylinder on the outer circumference side, the product container and the hollow cylinder being arranged in a housing made of metallic material. The task that is to be solved by the previously known pressure pack is seen in the ease with which it can be filled. To fill the pressure pack, it is provided that the hollow cylinder is stretched in the axial direction until the product container has its largest possible volume within the housing. In this position, the hollow cylinder is locked so that the liquid can be filled into the product container without the pressure to expand the hollow cylinder having to be overcome. Before the intended use of the known pressure pack, the locking is released and the liquid contained in the product container is pressurized with the pressure P max. When the pressure pack is actuated, the spray pressure is only dependent on the force exerted on the liquid inside the product container by the tensioned expansion element. The tension on the liquid decreases with increasing emptying of the product container, so that there are undesirable changes in the spray behavior. A complete emptying of the product container is not possible since the pressure on the liquid becomes too low shortly before the voltage reaches zero and because a liquid residue corresponding to the unextended length of the expansion element remains in the product container.

Der Erfindung liegt die Aufgabe zugrunde, eine als Sprühdose verwendbare Druckpackung zu zeigen, die sich vergleichsweise einfacher herstellen läßt und es gestattet, höhere Füllgrade zu erreichen und dabei die in dem Produktbehälter enthaltene Flüssigkeit restlos zu versprühen mit einem Druck, der innerhalb des durch P min und P max umgrenzten Bereiches optimaler Sprühnebelbildung liegt.The invention has for its object to show a pressure can be used as a spray can, which is comparatively can be manufactured more easily and allows higher filling levels to be achieved and at the same time completely spray the liquid contained in the product container with a pressure which lies within the range of optimal spray formation defined by P min and P max.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved with the characterizing features of claim 1. The subclaims refer to advantageous embodiments.

Bei der erfindungsgemäßen Druckpackung ist der Freiraum nach außen hermetisch abgeschlossen und bei entleertem Produktbehälter unter Vorspannung des Hohlzylinders mit einem Gas gefüllt, das etwa einen Überdruck P min aufweist, wobei die Flüssigkeit in einer solchen Menge in den Produktbehälter eingespeist ist, daß das in dem Freiraum enthaltene Gas etwa den Druck P max erreicht. Durch die drucklose Verformbarkeit des Produktbehälters wird der in dem Freiraum herrschende Druck verlustfrei auf die in diesem enthaltene, zu versprühende Flüssigkeit übertragen. Bei einer Betätigung des Auslaßventils des Produktbehälters ist die Flüssigkeit daher stets mit einem Druck verfügbar, der zwischen P min und P max liegt. In diesem Bereich ist die Flüssigkeit in optimaler Weiser versprühbar. Weder bei völlig gefülltem Produktbehälter noch beim Erreichen des Entleerungszustandes ist daher eine unerwünschte Tropfenbildung an der Austrittsdüse des Sprühventils zu befürchten.In the pressure pack according to the invention, the free space is hermetically sealed to the outside and, when the product container is emptied, is pre-stressed in the hollow cylinder with a gas which has approximately a positive pressure P min, the liquid being fed into the product container in such an amount that this is in the free space contained gas reached about the pressure P max. Due to the pressure-free deformability of the product container, the pressure prevailing in the free space is transferred without loss to the liquid to be sprayed therein. When the outlet valve of the product container is actuated, the liquid is therefore always available with a pressure which is between P min and P max. In this area, the liquid can be sprayed in an optimal manner. There is therefore no risk of undesired droplet formation at the outlet nozzle of the spray valve, either when the product container is completely full or when the emptying state is reached.

Der Totraum des Hohlzylinders ist bei der erfindungsgemäßen Druckpackung vollständig mit einem Druckgaspolster ausgefüllt. Die elastischen Eigenschaften des Hohlzylinders werden hierdurch in einer vorteilhaften Weise ergänzt.The dead space of the hollow cylinder is completely filled with a pressure gas cushion in the pressure pack according to the invention. The elastic properties of the hollow cylinder are hereby supplemented in an advantageous manner.

Das in dem Druckgaspolster erhaltene Gas besteht zweckmäßig aus Argon oder Luft. Besondere Maßnahmen zur Erzielung einer guten Umweltverträglichkeit sind hierdurch entbehrlich.The gas obtained in the pressure gas cushion suitably consists of argon or air. This makes special measures to achieve good environmental compatibility unnecessary.

Um bei einer langen Zwischenlagerung der Druckpackung eine gute Funktionssicherheit zu gewährleisten, hat es sich als vorteilhaft bewährt, wenn der das vorgespannte Gas enthaltende Freiraum entweder mit einem diffusionssicheren Gas gefüllt ist, beispielsweise mit Argon, oder durch eine gasdichte Diffusionssperre von der Umgebung abgetrennt ist. Hierbei kann es sich um eine innen und/oder außenseitig an dem Hohlzylinder angebrachten Beschichtung aus einem verformbaren Werkstoff handeln, beispielsweise aus einem der bekannten Dichtwerkstoffe, die in der Reifenindustrie gebräuchlich sind. Daneben besteht auch die Möglichkeit, als Diffusionssperre einen Übertopf zu verwenden, der den Hohlzylinder außenseitig umschließt. Zweckmäßigerweise besteht der Übertopf aus einem metallischen Werkstoff und kann gleichzeitig der Kennzeichnung des Inhaltes bzw. als Werbeträger dienen.In order to ensure good functional reliability during a long interim storage of the pressure pack, it has proven to be advantageous if the free space containing the prestressed gas is either filled with a diffusion-proof gas, for example with argon, or is separated from the surroundings by a gas-tight diffusion barrier. This can be a coating made of a deformable material on the inside and / or outside of the hollow cylinder, for example one of the known sealing materials that are used in the tire industry. In addition, there is also the option of using a planter as a diffusion barrier, which surrounds the outside of the hollow cylinder. The planter expediently consists of a metallic material and can at the same time serve to mark the contents or as an advertising medium.

Falls als Diffussionsperre ein Übertopf zur Anwendung gelangt, besteht die Möglichkeit, den durch den Abstand zwischen dem Übertopf und dem Hohlzylinder gebildeten Zwischenraum mit Luft zu füllen. Hierbei bietet es sich an, die Luft mit dem Druck P 10 elastisch vorzuspannen, um eine Unterstützung der Federelastizität des Hohlzylinders zu erreichen.If a planter is used as a diffusion barrier, there is the possibility of filling the space formed by the distance between the planter and the hollow cylinder with air. It is advisable to preload the air elastically with the pressure P 10 in order to support the spring elasticity of the hollow cylinder.

Jedenfalls sollte der Druck P 10 so bemessen sein, daß bei völlig entleertem Produktbehälter der atmosphärische Druck zumindest erreicht wird. Diffusionsverluste aus dem Freiraum 3 lassen sich durch den Übertopf zu einem gewissen Anteil kompensieren, da einem Druckabfall im Freiraum 3 ein Druckanstieg im Zwischenraum 10 gegenübersteht. Ist der beim Befüllen des Produktbehälters 1 bzw. des Freiraumes 3 im Zwischenraum 10 entstehende Überdruck unerwünscht, so kann ein in der Wand des Übertopfes vorgesehenes Ventil betätigt und die komprimierte Luft abgelassen werden. Danach schließt sich das Ventil selbsttätig, so daß bei der Lagerung eventuell vom Freiraum 3 in den Zwischenraum 10 diffundierendes Gas dort zu dem kompensatorischen Druckanstieg führt. Bevor andererseits bei rascher Entleerung ein Unterdruck im Zwischenraum 10 entstehen kann tritt durch selbsttätiges Öffnen des Ventils ein Ausgleich mit der Atmosphäre ein.In any case, the pressure P 10 should be such that the atmospheric pressure is at least reached when the product container is completely empty. Diffusion losses from the free space 3 can to a certain extent through the planter compensate because a pressure drop in the free space 3 is opposed by a pressure increase in the intermediate space 10. If the excess pressure which arises when filling the product container 1 or the free space 3 in the intermediate space 10 is undesirable, a valve provided in the wall of the planter can be actuated and the compressed air can be discharged. The valve then closes automatically, so that gas which diffuses from the free space 3 into the intermediate space 10 during storage leads there to the compensatory pressure increase. Before, on the other hand, a negative pressure can arise in the intermediate space 10 during rapid emptying, a compensation with the atmosphere occurs by automatically opening the valve.

Der Gegenstand der Erfindung wird nachfolgend anhand eines Ausführungsbeispiels und der in der Anlage beigefügten Zeichnung weiter verdeutlicht. Diese zeigt eine Druckpackung in längsgeschnittener Darstellung, welche zum Versprühen einer Flüssigkeit 4 aus einem im wesentlichen drucklos zusammendrückbaren Produktbehälter 1 bestimmt ist. Der Produktbehälter 1 ist von einem nur in Längsrichtung dehnbaren, elastisch vorgespannten Hohlzylinder 2 aus gummielastischem Werkstoff umschlossen, der im Bereich seiner stirnseitigen Enden an Böden 6 befestigt ist. Diese bestehen aus tiefgezogenen, metallischen Formteilen, von denen das Obere der Festlegung in einem metallischen Übertopf 5 dient. Der Hohlzylinder 2 ist im Bereich seiner Außenseite durch einen senkrechten Abstand voneinander aufweisende, unter normalen Betriebsbedingungen nicht dehnbare, metallische Ringe 7 armiert und mit einer elastisch dehnbaren Beschichtung aus Butylkautschuk überzogen, welche als Diffusionssperre 8 dient. Diese ist gemeinsam mit dem Hohlzylinder 2 verformbar.The subject matter of the invention will be further clarified using an exemplary embodiment and the drawing enclosed in the system. This shows a pressure pack in longitudinal section, which is intended for spraying a liquid 4 from a product container 1 which can be compressed essentially without pressure. The product container 1 is enclosed by a longitudinally stretchable, elastically prestressed hollow cylinder 2 made of rubber-elastic material, which is fastened to floors 6 in the region of its front ends. These consist of deep-drawn, metallic molded parts, the upper part of which is used for fixing in a metallic planter 5. The hollow cylinder 2 is reinforced in the area of its outside by a vertical spacing from one another, which is not expandable under normal operating conditions, metallic rings 7 and is coated with an elastically stretchable coating of butyl rubber, which serves as a diffusion barrier 8. This is deformable together with the hollow cylinder 2.

Der Freiraum 3 zwischen dem Produktbehälter 1 und dem Hohlzylinder 2 ist mit Luft gefüllt. Diese ist bei entleertem Produktbehälter 1 vorgespannt auf einen Druck P min, der bei einer Betätigung des Sprühventils 9 noch ein optimales Versprühen der während der normalen Verwendung in dem Produktbehälter 1 enthaltenen Flüssigkeit 4 gestattet. Der diesbezüglich benötigte Druck ist abhängig von der Art der zu versprühenden Flüssigkeit 4. Er läßt sich anhand einfacher Versuche bestimmen.The free space 3 between the product container 1 and the hollow cylinder 2 is filled with air. When the product container 1 is emptied, this is biased to a pressure P min which, when the spray valve 9 is actuated, still permits optimal spraying of the liquid 4 contained in the product container 1 during normal use. The pressure required in this regard depends on the type of liquid 4 to be sprayed. It can be determined using simple experiments.

Zur Herstellung der Betriebsbereitschaft wird in den Produktbehälter der im Sinne der vorstehenden Darlegungen vorbereiteten Druckpackung soviel zu versprühende Flüssigkeit eingespeist, daß die in dem Freiraum 3 enthaltene Luft den Druck P max erreicht, bei dem das optimale Sprühbild erreicht wird. Der bei P min vorgespannte Hohlzylinder nimmt seine vorgesehene Maximaldehnung ein, wenn der Druck P max erreicht ist. Auch der diesbezügliche Wert ist von der Art der zu versprühenden Flüssigkeit 4 und der verwendeten Düse abhängig und läßt sich gegebenenfalls anhand einfacher Versuche ermitteln.To produce the operational readiness, enough liquid to be sprayed is fed into the product container of the pressure pack prepared in the sense of the above statements so that the air contained in the free space 3 reaches the pressure P max at which the optimal spray pattern is achieved. The hollow cylinder pretensioned at P min assumes its maximum expansion when the pressure P max is reached. The relevant value also depends on the type of liquid 4 to be sprayed and the nozzle used and can be determined, if necessary, using simple tests.

Der Hohlzylinder 2 ist bei dem gezeigten Ausführungsbeispiel außenseitig von einem Übertopf 5 umschlossen und im Bereich des oberen Bodens mit diesem verbunden. Der Übertopf 5 besteht aus metallischem Werkstoff und ist hierdurch sowohl diffusionsundurchlässig als auch druckfest. Er weist in dem gezeigten, bis zur Obergrenze aufgefüllten Zustand des Produktbehälters 1 noch einen allseitigen Abstand von dem Hohlzylinder 2 auf sowie von dessen unterem Boden 6. Der hierdurch gebildete Zwischenraum 10 ist mit Luft gefüllt, welche bei entleertem Produktbehälter den Druck P 10 aufweist, welcher wenigstens so groß ist wie der Druck der Atmosphäre. In dem gezeigten, vollständig gefüllten Zustand des Produktbehälters 1 ist der Druck des in dem Zwischenraum 10 enthaltenen Gases wesentlich höher. Die Federelastitziät des Hohlzylinders 2 wird hierdurch merklich unterstützt. Zusätzlich ergibt sich eine gewisse Reduzierung von diffusionsbedingten Druckverlusten des Freiraumes 3, welche sich bei längerer Lagerung auftreten können.In the exemplary embodiment shown, the hollow cylinder 2 is enclosed on the outside by a planter 5 and connected to it in the region of the upper base. The planter 5 is made of metallic material and is therefore both impermeable to diffusion and pressure-resistant. In the state of the product container 1 shown, which is filled up to the upper limit, it still has an all-round distance from the hollow cylinder 2 and from its lower base 6. The intermediate space 10 formed in this way is filled with air, which has the pressure P 10 when the product container is empty, which is at least as big as the pressure of the atmosphere. In the fully filled condition shown of the product container 1, the pressure of the gas contained in the intermediate space 10 is significantly higher. The spring elasticity of the hollow cylinder 2 is thereby noticeably supported. In addition, there is a certain reduction in diffusion-related pressure losses in the free space 3, which can occur with prolonged storage.

Der im Innern des Hohlzylinders 2 herrschende Überdruck des Gases garantiert eine vollständige Entleerung des Produktbehälters 1 bei dem vorgesehenen Überdruck P min. Sowohl der vermittels einer Armierung nur in einer Richtung verformbare Hohlzylinder 2 als auch der Produktbehälter 1 können im Rahmen der Erfindung eine andere Gestalt erhalten, desgleichen die Form der Druckpackung insgesamt. Ferner können zur Einstellung des Gasdruckes im Freiraum 3 und ebenso im Zwischenraum 10 nicht dargestellte Öffnungen mit Ventilfunktion vorgesehen werden.The excess pressure of the gas inside the hollow cylinder 2 guarantees a complete emptying of the product container 1 at the intended excess pressure P min. Both the hollow cylinder 2, which can be deformed in one direction by means of reinforcement, and the product container 1 can have a different shape within the scope of the invention, as can the shape of the pressure pack as a whole. Furthermore, openings with a valve function (not shown) can be provided for adjusting the gas pressure in the free space 3 and also in the intermediate space 10.

Der erfindungsgemäße Druckbehälter kann auch für pastöse Produkte Verwendung finden. Der erreichbare hohe Füllgrad bei zugleich besonders geringem Druckunterschied zwischen P max und P min ist dabei ebenfalls von Vorteil und verhilft zu großer Gleichmäßigkeit des ausgespritzten Produktstranges.The pressure vessel according to the invention can also be used for pasty products. The achievable high degree of filling with a particularly low pressure difference between P max and P min is also an advantage and helps to ensure that the sprayed product strand is very uniform.

Claims (10)

  1. A pressure packaging for spraying a liquid (4) from a product container (1) which is compressible in an essentially pressureless manner, the product container (1) being enclosed by an elastically pretensioned hollow cylinder (2) which is extensible in only one direction and made of elastomeric material and being subjected to a pressure which, in dependence on the state of filling of the product container (1), can be varied between a minimum pressure Pmin and a maximum pressure Pmax and an empty space (3) being provided between the product container (1) and the hollow cylinder (2), characterized in that the empty space (3) is hermetically sealed towards the outside and, when the product container (1) is empty, is filled, pretensioning the hollow cylinder (2), with a gas approximately having a superatmospheric pressure Pmin and in that the liquid (4) is fed into the product container (1) in such an amount that the gas contained in the empty space (3) reaches approximately the pressure Pmax.
  2. A pressure packaging according to claim 1, characterized in that the gas is composed of argon.
  3. A pressure packaging according to claim 1, characterized in that the gas is composed of air.
  4. A pressure packaging according to any of claims 1 to 3, characterized in that the empty space (3), in addition to the hollow cylinder, is separated from the surroundings by a gastight diffusion barrier (5, 8).
  5. A pressure packaging according to claim 4, characterized in that the diffusion barrier is composed of a coating (8) of deformable material applied to the hollow cylinder (2).
  6. A pressure packaging according to claim 4, characterized in that the diffusion barrier is composed of an outer casing (5) enclosing the hollow cylinder (2).
  7. A pressure packaging according to claim 6, characterized in that the outer casing (5) is composed of a metallic material.
  8. A pressure packaging according to either of claims 6 and 7, characterized in that the outer casing (5) encloses the hollow cylinder (2) with a spacing and that the interspace (10) formed by the spacing is filled with air.
  9. A pressure packaging according to claim 8, characterized in that the air contained in the interspace (10), when the product container (1) is empty, has the pressure P 10 and in that the pressure P 10 is at least as high as the atmospheric pressure.
  10. A pressure packaging according to claim 8, characterized in that the wall of the outer casing (5) has an opening (11) in which an inwardly permeable non-return valve is arranged and in that the non-return valve can be externally actuated.
EP19900104896 1989-12-08 1990-03-15 Pressurized package Expired - Lifetime EP0432343B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90104896T ATE101835T1 (en) 1989-12-08 1990-03-15 PRESSURE PACK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3940601 1989-12-08
DE3940601 1989-12-08

Publications (2)

Publication Number Publication Date
EP0432343A1 EP0432343A1 (en) 1991-06-19
EP0432343B1 true EP0432343B1 (en) 1994-02-23

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EP19900104896 Expired - Lifetime EP0432343B1 (en) 1989-12-08 1990-03-15 Pressurized package

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US (1) US5069363A (en)
EP (1) EP0432343B1 (en)
JP (1) JPH03187874A (en)
AT (1) ATE101835T1 (en)
BR (1) BR9003212A (en)
DE (1) DE59004681D1 (en)

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ES2229241T3 (en) * 1994-10-18 2005-04-16 Steven M. Utter PORTATIVE DEVICE FOR REFRIGERATION BY SPRAY MIST.
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Also Published As

Publication number Publication date
BR9003212A (en) 1991-08-27
ATE101835T1 (en) 1994-03-15
DE59004681D1 (en) 1994-03-31
US5069363A (en) 1991-12-03
JPH03187874A (en) 1991-08-15
EP0432343A1 (en) 1991-06-19

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