EP0499783A1 - Overpressure valve for packages - Google Patents
Overpressure valve for packages Download PDFInfo
- Publication number
- EP0499783A1 EP0499783A1 EP19920100475 EP92100475A EP0499783A1 EP 0499783 A1 EP0499783 A1 EP 0499783A1 EP 19920100475 EP19920100475 EP 19920100475 EP 92100475 A EP92100475 A EP 92100475A EP 0499783 A1 EP0499783 A1 EP 0499783A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive
- pressure relief
- relief valve
- adhesive strips
- membrane
- 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
Links
- 230000001070 adhesive effect Effects 0.000 claims abstract description 47
- 239000000853 adhesive Substances 0.000 claims abstract description 46
- 239000012528 membrane Substances 0.000 claims abstract description 39
- 238000004806 packaging method and process Methods 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 description 6
- 239000000565 sealant Substances 0.000 description 4
- 241001631457 Cannula Species 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/22—Details
- B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
Definitions
- the invention is based on a pressure relief valve for packaging containers according to the preamble of claim 1.
- a valve of this type known for example from DE-OS 35 26 586
- the adhesive strips which are arranged in the region of the edge zones of the membrane and which delimit the adhesive-free zone, a rectangular cross section with a thickness corresponding approximately to the thickness of the membrane.
- cannulas are formed in the transition regions from the adhesive-free zone to the edge zones with the adhesive strips with the valve closed, that is, when the adhesive-free zone of the membrane lies sealingly on the congruent part of the packing wall.
- the pressure relief valve according to the invention with the characterizing feature of claim 1 has the advantage that when the valve is closed, the elastic valve membrane with its adhesive-free zone also lies with its transition areas to the adhesive strips against the congruent part of the packing wall. Furthermore, the thick part of the adhesive strip on the edge has the effect that a wall of an adjacent pack in a multipack is supported on the raised edge zones of the membrane, which act as spacers, so that the overpressure-free central zone, which forms a channel, can bulge freely in the event of excess pressure occurring in the pack and thus the functionality of the pressure relief valve is given.
- a check as to whether a pressure relief valve is arranged on a packaging container can easily be carried out with electromagnetic or optical control devices if the adhesive strips are equipped in accordance with the feature of claim 7.
- a method for simple manufacture of the pressure relief valve according to claim 1 is characterized in claims 7 and 8.
- FIG. 1 shows a bag pack with a pressure relief valve in a diagrammatic view
- FIGS. 2 to 7 show different exemplary embodiments of the pressure relief valve in cross section on an enlarged scale, the thickness (height) of the parts being shown greatly enlarged in relation to the width.
- the pressure relief valve 1 is arranged on a packaging container, for example on a gas-tight bag 2, and serves to discharge gases which are produced by the packaged product. It closes a plurality of holes 4 in the form of pinholes in a flat wall 3 of the bag 2.
- the bag 2 is water-vapor and gas-tight and is suitable for holding air and moisture-sensitive food and beverages, in particular coffee.
- the pressure relief valve 1 has a membrane 10 made of a transparent, flexible film.
- the membrane 10 consists of a film made of a thermoplastic, for example polyester, polyethylene or the like, and has a thickness of 20 to 100 ⁇ m, preferably 50 ⁇ m.
- the base film may also have a polyvinylidene chloride barrier.
- the membrane 10 preferably has a square shape with an edge length of approximately 20 mm and rounded corners.
- the membrane 10 is fastened with two strips 11, 12 made of an adhesive.
- the adhesive strips 11, 12 are applied to the inside of the membrane 10 on two parallel edge zones 13, 14, so that an adhesive-free central zone 15 extends between them, which covers the holes 4 and extends parallel to the adhesive strips 11, 12 to the edges 16, 17 of the membrane extends, on which the adhesive strips 11, 12 also end. It is also conceivable that the adhesive-free zone ends only at one edge of the membrane.
- the adhesive strips 11, 12 have the shape of a wedge, the pointed edge 18 of which delimits the adhesive-free middle zone 15 and the thick edge 19 of which is flush with the edge edges of the edge zones 13, 14 of the membrane 10.
- the width of the adhesive strips 11, 12 is, for example, 4 to 5 mm and the width of the adhesive-free zone 15 of the membrane 10 is 8 to 10 mm.
- the adhesive strips 11, 12 have a thickness that is approximately the same as the thickness of the membrane, namely in the size range from 20 to 100 ⁇ m, preferably 50 ⁇ m.
- the adhesive of the strips 11, 12, which has pressure-sensitive adhesive properties, is preferably based on polyurethane.
- the adhesive strips 11, 12 are applied to the membrane 10, preferably before it is cut out or separated from a film strip. They can be applied in the form of a wedge-shaped adhesive strand that is sprayed out of a nozzle. However, strands of different profiles can also be applied, which are then brought into wedge shape by shaping rolls on the film.
- the membrane 10 In the closed state of the pressure relief valve 1, in which the adhesive-free zone 15 of the membrane 10 rests on the congruent part of the wall 3, the membrane 10 has the shape of a groove.
- the adhesive-free zone 15 forms a valve member and the congruent plane part of the wall 3 forms a valve seat. If the pressure in the interior of the bag pack rises above the surrounding atmospheric pressure, the elastic and flexible, adhesive-free zone 15 of the membrane 10, starting from the central area covering the holes 4, is first lifted off in the form of an enlarging bubble and then in the form of a flat curvature , forming a channel through which gas flows out of the interior of the bag package. After a certain amount of gas has been let off and the associated reduction in the internal pressure of the package, the adhesive-free zone 15 lies again in a sealing manner on the wall 3.
- the wedge-shaped adhesive has the advantage that in the region of the transition from the adhesive-free zone 15 to the edge zones 13, 14 to the adhesive strips 11, 12 no cannulas can be formed which impair the tightness of the pressure relief valve 1. Furthermore, the thick part of the adhesive strips 11, 12 acts as a spacer, so that a wall of an adjacent pack in a multipack is supported on the raised edge zones 13, 14 of the membrane 10, so that the excess of the adhesive-free zone 15 bulges freely to form a channel when overpressure occurs can and thus the functionality of the pressure relief valve is maintained.
- the plastic adhesive can flow through a longer pressing action of an adjacent, adjacent pack and can thereby flatten the wedge-shaped shape, so that the lifting of the adhesive-free zone 15 of the membrane 10 from the wall 3 of the bag 2 is hindered, according to a further feature of the invention in the area of the thick edge 19 in the adhesive strips 11, 12 solid body 28 or a continuous solid thread 27 embedded ( Figures 5 and 6).
- the bodies 28, which consist, for example, of quartz sand, are sprinkled and rolled in a track on the edge-thick areas after the adhesive strips 11, 12 have been applied to the membrane 10.
- the thread 27, which consists of a plastic can run along in a simple manner when applying the adhesive. Furthermore, rigid spacer strips can be arranged on the membrane 10 above the adhesive strips 11, 12.
- FIG. 2 shows, the surface 21 of the strips 11, 12 which is in contact with the membrane 10 is flat and has a uniform slope. They are further reinforced if the surface 21 is wave-shaped (FIG. 3), so that the area 22 close to the adhesive-free zone 15 and the outer area 23 have a slight slope, whereas the one in between middle area 24 have a large slope.
- the adhesive strips 11, 12 form a wedge that is not connected in cross section, but rather are applied as two parallel strands 25, 26 on the edge zones 13, 14 of the membrane 10 , wherein the strands 26 of adhesive, which are close to the adhesive-free zone 15, have a very small thickness and the outer strands 25, which are close to the edge edges, have a comparatively large thickness.
- a liquid sealant for example silicone oil
- silicone oil is arranged between the adhesive-free zone 15 of the membrane 10 and the congruent part of the wall 3 of the bag 2.
- the film breaks out of silicone oil and forms again when the pressure relief valve is closed.
- the sealant is introduced into the channel by depositing a drop of it on at least one end of the channel, from where it is drawn into the channel by capillary action.
- it can also be arranged on the adhesive-free zone 15 of the membrane 10 before it is attached to the bag 2.
- sealant when the membrane 10 still adheres to a carrier strip on which the membranes are arranged during manufacture and stored until they are transferred to a packaging container.
- the sealant can be attached to the outer ends of the adhesive-free zone, but it can also be applied to the central area of the adhesive-free zone if the carrier strip has a breakthrough in the central covering area.
- the membrane consists of a material whose coefficient of thermal expansion is approximately equal to that of the material from which the bag is made, so that when the temperature changes there are no tensions in the membrane which affect the tightness and the opening pressure of the pressure relief valve.
- the membrane 10 forms, together with the wall 3 of a packaging container 2, a pressure relief valve. If the wall 3 has little rigidity, so that uncontrollable stresses are transmitted to the membrane 10, it is also possible to fix the membrane 10 with the wedge-shaped adhesive strips 11, 12 on a congruent, perforated base plate 30, and the valve thus formed on to glue the wall of the packaging container 3 ( Figure 7).
- the base plate 31, which consist of polyvinyl chloride or a similar plastic and can have a thickness of 150-250 ⁇ m, has a central hole 32 and is provided with an adhesive layer 33 over the entire surface on the underside.
- a solhces pressure relief valve 1 ' is attached with its hole 32 to cover the holes 4 in the bag 2 on the wall 3 of the bag 2.
- the strips 11, 12 have particles of a substance mixed into them in the adhesive, which can be easily and safely probed with a test device.
- Such substances which preferably have magnetic, fluorescent or luminescent properties, can work with induction or reflected light.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
- Bag Frames (AREA)
Abstract
Ein Überdruckventil (1) an einem Verpackungsbehälter (2), das verhindert, daß Luft aus der Atmosphäre in die Packung eindringt und bei gasabgebendem Packungsgut den entstehenden Überdruck durch Ablassen von Gas abbaut, hat eine auf einer Wand (3) des Behälters über Durchgangslöchern (4) aufgeklebte Membran (10). Die Membran (10) ist mit randseitigen Klebemassestreifen (11, 12), eine klebstofffreie Zone (15) über den Durchgangslöchern (4) freilassend an der Wand befestigt, wobei die klebstofffreie Zone (15) ein Ventilglied und der deckungsgleiche Teil der Wand (3) einen Ventilsitz bilden. Die Klebemassestreifen (11, 12) haben Keilform, so daß die Übergangsbereiche der klebstofffreien Zone (15) zu den Klebemassestreifen (11, 12) hin auf der Wand aufliegen und die erhöhten Randbereiche Abstandshalter für benachbarte Packungen bilden. <IMAGE>A pressure relief valve (1) on a packaging container (2), which prevents air from entering the packaging from the atmosphere and relieves the excess pressure that arises in the case of gas-emitting packaged goods by releasing gas, has one on a wall (3) of the container via through holes ( 4) glued membrane (10). The membrane (10) is attached to the wall with adhesive strips (11, 12) on the edge, leaving an adhesive-free zone (15) above the through holes (4), the adhesive-free zone (15) being a valve member and the congruent part of the wall (3 ) form a valve seat. The adhesive strips (11, 12) have a wedge shape, so that the transition areas of the adhesive-free zone (15) to the adhesive strips (11, 12) rest on the wall and the raised edge areas form spacers for adjacent packs. <IMAGE>
Description
Die Erfindung geht aus von einem Überdruckventil für Verpackungsbehälter nach dem Oberbegriff des Anspruchs 1. Bei einem beispielsweise aus der DE-OS 35 26 586 bekannten Ventil dieser Art haben die Klebemassestreifen, die im Bereich der Randzonen der Membran angeordnet sind und die klebstofffreie Zone begrenzen, einen rechteckförmigen Querschnitt mit einer in etwa der Dicke der Membran entsprechenden Dicke. Dadurch sind in den Übergangsbereichen der klebstofffreien Zone zu den Randzonen mit den Klebemassestreifen bei geschlossenem Ventil, das ist, wenn die klebstofffreie Zone der Membran auf dem deckungsgleichen Teil der Packungswand dichtend anliegt, Kanülen ausgebildet. Durch diese Kanülen und das Loch in der Packungswand kann insbesondere bei Unterdruck in der Packung Luft aus der Umgebung in die Packung eindringen, deren Sauerstoffanteil zum Verderb des sauerstoffempfindlichen Verpackungsgutes führt. Es ist daher eine Ventilausbildung erstrebenswert, bei der solche Undichtigkeiten nicht auftreten können.The invention is based on a pressure relief valve for packaging containers according to the preamble of claim 1. In a valve of this type, known for example from DE-OS 35 26 586, the adhesive strips which are arranged in the region of the edge zones of the membrane and which delimit the adhesive-free zone, a rectangular cross section with a thickness corresponding approximately to the thickness of the membrane. As a result, cannulas are formed in the transition regions from the adhesive-free zone to the edge zones with the adhesive strips with the valve closed, that is, when the adhesive-free zone of the membrane lies sealingly on the congruent part of the packing wall. Through these cannulas and the hole in the pack wall, air from the environment can penetrate into the pack, particularly in the case of negative pressure in the pack, the oxygen content of which leads to the spoilage of the oxygen-sensitive packaged goods. It is therefore desirable to design a valve in which such leaks cannot occur.
Das erfindungsgemäße Überdruckventil mit dem kennzeichnenden Merkmal des Anspruchs 1 hat den Vorteil, daß bei geschlossenem Ventil die elastische Ventilmembran mit ihrer klebstofffreien Zone auch mit deren Übergangsbereichen zu den Klebemassestreifen hin dichtend auf dem deckungsgleichen Teil der Packungswand anliegt. Ferner hat der randseitige dicke Teil der Klebemassestreifen die Wirkung, daß eine Wand einer benachbarten Packung in einer Sammelpackung sich an den erhöhten als Abstandshalter wirkenden Randzonen der Membran abstützt, so daß bei auftretendem Überdruck in der Packung die klebstofffreie Mittelzone einen Kanal bildend sich frei auswölben kann und damit die Funktionsfähigkeit des Überdruckventils gegeben ist. Diese Vorteile treten verstärkt auf, wenn die Klebemassestreifen nach den Merkmalen der Ansprüche 3, 4 und 6 ausgebildet sind.The pressure relief valve according to the invention with the characterizing feature of claim 1 has the advantage that when the valve is closed, the elastic valve membrane with its adhesive-free zone also lies with its transition areas to the adhesive strips against the congruent part of the packing wall. Furthermore, the thick part of the adhesive strip on the edge has the effect that a wall of an adjacent pack in a multipack is supported on the raised edge zones of the membrane, which act as spacers, so that the overpressure-free central zone, which forms a channel, can bulge freely in the event of excess pressure occurring in the pack and thus the functionality of the pressure relief valve is given. These advantages occur more when the adhesive strips are designed according to the features of
Eine Kontrolle, ob jeweils ein Überdruckventil an einem Verpackungsbehälter angeordnet ist, läßt sich mit elektromagnetischen oder optischen Kontrollgeräten leicht durchführen, wenn die Klebemassestreifen entsprechend dem Merkmal des Anspruchs 7 ausgerüstet sind. Ein Verfahren zum einfachen Herstellen des Überdruckventils nach Anspruch 1 ist in Anspruch 7 und 8 gekennzeichnet.A check as to whether a pressure relief valve is arranged on a packaging container can easily be carried out with electromagnetic or optical control devices if the adhesive strips are equipped in accordance with the feature of claim 7. A method for simple manufacture of the pressure relief valve according to claim 1 is characterized in claims 7 and 8.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Beutelpackung mit einem Überdruckventil in schaubildlicher Ansicht sowie die Figuren 2 bis 7 verschiedene Ausführungsbeispiele des Überdruckventils im Querschnitt in vergrößertem Maßstab, wobei die Dicke (Höhe) der Teile gegenüber der Breite stark vergrößert dargestellt ist.Embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows a bag pack with a pressure relief valve in a diagrammatic view, and FIGS. 2 to 7 show different exemplary embodiments of the pressure relief valve in cross section on an enlarged scale, the thickness (height) of the parts being shown greatly enlarged in relation to the width.
Das Überdruckventil 1 ist an einem Verpackungsbehälter, beispielsweise an einem gasdichten Beutel 2 angeordnet und dient zum Ablassen von Gasen, die vom verpackten Produkt erzeugt werden. Es verschließt mehrere in Form von Nadelstichen ausgebildete Löcher 4 in einer ebenen Wand 3 des Beutels 2. Der Beutel 2 ist wasserdampf- und gasdicht und zur Aufnahme von luft- und feuchtigkeitsempfindlichen Nahrungs- und Genußmitteln, insbesondere Kaffee geeignet.The pressure relief valve 1 is arranged on a packaging container, for example on a gas-
Das Überdruckventil 1 weist eine Membrane 10 aus einer transparenten, flexiblen Folie auf. Die Membrane 10 besteht aus einer Folie aus einem thermoplastischen Kunststoff, beispielsweise Polyester, Polyethylen oder dergleichen und hat eine Dicke von 20 bis 100 µm, vorzugweise 50 µm. Die Ausgangsfolie kann auch eine Sperrschicht aus Polyvinylidenchlorid haben.The pressure relief valve 1 has a
Die Membrane 10 hat vorzugweise Quadratform mit einer Kantenlänge von etwa 20 mm und abgerundete Ecken. An der Wand 3 des Beutels 2 ist die Membrane 10 mit zwei Streifen 11, 12 aus einer Klebemasse befestigt. Die Klebemassestreifen 11, 12 sind an der Innenseite der Membrane 10 auf zwei parallelen Randzonen 13, 14 aufgetragen, so daß sich dazwischen eine klebstofffreie mittlere Zone 15 erstreckt, welche die Löcher 4 überdeckt und sich parallel zu den Klebemassestreifen 11, 12 bis zu den Rändern 16, 17 der Membrane erstreckt, an denen auch die Klebemassestreifen 11, 12 enden. Denkbar ist auch, daß die klebstofffreie Zone nur an einem Rand der Membrane endet.The
Die Klebemassestreifen 11, 12 haben die Form eines Keils, dessen spitzer Rand 18 die klebstofffreie mittlere Zone 15 begrenzt und dessen dicker Rand 19 mit den Randkanten der Randzonen 13, 14 der Membrane 10 abschließt. Die Breite der Klebemassestreifen 11, 12 beträgt beispielsweise 4 bis 5 mm und die Breite der klebstofffreien Zone 15 der Membrane 10 8 bis 10 mm. Am äußeren dicken Rand 19 haben die Klebemassestreifen 11, 12 eine Dicke, die etwa der Dicke der Membran gleich ist, nämlich im Größenbereich von 20 bis 100 µm, vorzugsweise 50 µm. Die Klebemasse der Streifen 11, 12, die Haftklebeeigenschaften besitzt, ist vorzugsweise auf der Grundlage von Polyurethan aufgebaut.The
Die Klebemassestreifen 11, 12 werden auf die Membrane 10 aufgebracht, vorzugsweise bevor diese aus einem Folienstreifen ausgeschnitten oder abgetrennt wird. Sie können in Gestalt eines keilförmigen Klebemassestranges, der aus einer Düse ausgespritzt wird, aufgetragen werden. Es können aber auch anders profilierte Stränge aufgetragen werden, die anschließend durch Formwalzen auf der Folie in Keilform gebracht werden.The
In geschlossenem Zustand des Überdruckventils 1, in dem die klebstofffreie Zone 15 der Membrane 10 auf dem deckungsgleichen Teil der Wand 3 aufliegt, hat die Membrane 10 die Form einer Rinne. Dabei bildet die klebstofffreie Zone 15 ein Ventilglied und der deckungsgleiche plane Teil der Wand 3 einen Ventilsitz. Steigt der Druck im Innenraum der Beutelpackung über den umgebenden Atmosphärendruck, wird die elastische und biegsame, klebstofffreie Zone 15 der Membrane 10, ausgehend vom zentralen, die Löcher 4 deckenden Bereich, zunächst in Form einer sich vergrößernden Blase und dann in Form einer flachen Wölbung abgehoben, wobei sich ein Kanal bildet, durch den Gas aus dem Innenraum der Beutelpackung abströmt. Nach dem Ablassen einer bestimmten Gasmenge und damit verbundenem Abbau des Innendrucks der Packung legt sich die klebstofffreie Zone 15 wieder dichtend auf die Wand 3.In the closed state of the pressure relief valve 1, in which the adhesive-
Die keilförmige Verklebung hat den Vorteil, daß sich im Bereich des Übergangs der klebstofffreien Zone 15 zu den Randzonen 13, 14 zu den Klebemassestreifen 11, 12 hin keine Kanülen ausbilden können, die die Dichtigkeit des Überdruckventils 1 beeinträchtigen. Ferner wirkt der dicke Teil der Klebemassestreifen 11, 12 wie Abstandshalter, so daß eine Wand einer benachbarten Packung in einer Sammelpackung sich an den erhöhten Randzonen 13, 14 der Membran 10 abstützt, so daß sich bei Überdruck die klebstofffreie Zone 15 einen Kanal bildend frei auswölben kann und damit die Funktionsfähigkeit des Überdruckventils erhalten bleibt.The wedge-shaped adhesive has the advantage that in the region of the transition from the adhesive-
Da durch länger dauernde Preßwirkung einer anliegenden, benachbarten Packung die plastische Klebemasse fließen und dadurch die keilförmige Gestalt verflachen kann, so daß das Abheben der klebstofffreien Zone 15 der Membrane 10 von der Wand 3 des Beutels 2 behindert ist, sind gemäß einem weiteren Merkmal der Erfindung im Bereich des dicken Randes 19 in den Klebemassestreifen 11, 12 feste Körper 28 oder ein durchgehender fester Faden 27 eingebettet (Figur 5 und 6). Die Körper 28, die beispielsweise aus Quarzsand bestehen, werden nach dem Auftragen der Klebemassestreifen 11, 12 auf die Membrane 10 in einer Spur auf den randseitigen dicken Bereichen aufgestreut und eingewalzt. Der Faden 27, der aus einem Kunststoff besteht, kann beim Auftragen der Klebemasse in einfacher Weise mitlaufen. Überdies können auf der Membrane 10 über den Klebemassestreifen 11, 12 steife Abstandshaltestreifen angeordnet werden.Since the plastic adhesive can flow through a longer pressing action of an adjacent, adjacent pack and can thereby flatten the wedge-shaped shape, so that the lifting of the adhesive-
Diese Vorteile sind gegeben, wenn, wie die Figur 2 zeigt, die an der Membrane 10 anliegende Fläche 21 der Streifen 11, 12 eben ist und eine gleichförmige Steigung aufweist. Sie werden noch verstärkt, wenn die Fläche 21 wellenförmig ausgebildet ist (Figur 3), so daß der der klebstofffreien Zone 15 nahe Bereich 22 und der äußere Bereich 23 eine geringe Steigung, dagegen der dazwischenliegende mittlere Bereich 24 eine große Steigung aufweisen. Diese Vorteile und Wirkungen lassen sich auch erzielen, wenn, wie die Figur 4 zeigt, die Klebemassestreifen 11, 12 einen im Querschnitt nicht zusammenhängenden Keil bilden, sondern als jeweils zwei parallele Stränge 25, 26 auf den Randzonen 13, 14 der Membrane 10 aufgetragen sind, wobei die der klebstofffreien Zone 15 nahen Stränge 26 aus Klebemasse eine sehr geringe Dicke und die äußeren, den Randkanten nahen Stränge 25 eine vergleichbar große Dicke haben.These advantages are present if, as FIG. 2 shows, the
Um ein Diffundieren von Umgebungsluft durch das geschlossene Überdruckventil 1 in das Innere der Packung zu verhindern, ist zwischen der klebstofffreien Zone 15 der Membrane 10 und dem deckungsgleichen Teil der Wand 3 des Beutels 2 ein flüssiges Dichtmittel, beispielsweise Silikonöl angeordnet. Beim Ausbilden des Entgasungskanals bricht der Film aus Silikonöl und bildet sich wieder beim Schließen des Überdruckventils. Das Dichtmittel wird in den Kanal eingebracht, indem ein Tropfen davon an wenigstens einem Ende des Kanals angelagert wird, von wo aus es durch Kapillarwirkung in den Kanal einzieht. Es kann aber auch auf der klebstofffreien Zone 15 der Membrane 10 angeordnet werden, bevor diese am Beutel 2 befestigt wird. Dies erfolgt vorzugsweise durch Anordnen des Dichtmittels, wenn die Membrane 10 noch auf einem Trägerstreifen haftet, auf dem die Membranen beim Herstellen angeordnet und bis zum Übertragen auf einen Verpackungsbehälter bevorratet werden. Das Dichtmittel kann an den äußeren Enden der klebstofffreien Zone angelagert werden, es kann aber auch auf dem zentralen Bereich der klebstofffreien Zone angebracht werden, wenn der Trägerstreifen im den zentralen Deckungsbereich einen Durchbruch hat.In order to prevent diffusion of ambient air through the closed pressure relief valve 1 into the interior of the package, a liquid sealant, for example silicone oil, is arranged between the adhesive-
Ergänzend wird darauf hingewiesen, daß die Membrane aus einem Material besteht, dessen Wärmeausdehnungskoeffizient etwa gleich dem des Materials ist, aus dem der Beutel besteht, so daß bei Temperaturwechsel keine Verspannungen in der Membrane entstehen, die die Dichtigkeit und den Öffnungsdruck des Überdruckventils beeinflussen.In addition, it is pointed out that the membrane consists of a material whose coefficient of thermal expansion is approximately equal to that of the material from which the bag is made, so that when the temperature changes there are no tensions in the membrane which affect the tightness and the opening pressure of the pressure relief valve.
Bei den oben beschriebenen Ausführungsbeispielen bildet die Membrane 10 zusammen mit der Wand 3 eines Verpackungsbehälters 2 ein Überdruckventil. Falls die Wand 3 wenig Steifigkeit besitzt, so daß unkontrollierbare Spannungen auf die Membrane 10 übertragen werden, ist es auch möglich, die Membrane 10 mit den keilförmigen Klebemassestreifen 11, 12 auf einer deckungsgleichen, gelochten Basisplatte 30 zu befestigen, und das so gebildete Ventil auf der Wand des Verpackungsbehälters 3 zu verkleben (Figur 7). Die Basisplatte 31, die aus Polyvinylchlorid oder einem ähnlichen Kunststoff bestehen und eine Dicke von 150 - 250 µm haben kann, hat ein zentrales Loch 32 und ist auf der Unterseite vollflächig mit einer Klebstoffschicht 33 versehen. Ein solhces Überdruckventil 1' ist mit seinem Loch 32 die Löcher 4 im Beutel 2 deckend auf der Wand 3 des Beutels 2 befestigt.In the exemplary embodiments described above, the
Um eine einfache Kontrolle zu schaffen, mit der es möglich ist, festzustellen, ob jeweils ein Überdruckventil an einer Packung angeordnet ist, sind in der Klebemasse der Streifen 11, 12 Teilchen eines Stoffes eingemischt, die sich mit einer Prüfvorrichtung leicht und sicher tasten lassen. Solche Stoffe, die vorzugsweise magnetische, fluoreszierende oder lumineszierende Eigenschaften haben, können mit Induktion oder Reflexlicht arbeiten.In order to create a simple control with which it is possible to determine whether a pressure relief valve is arranged on each package, the
Claims (9)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4104803 | 1991-02-16 | ||
DE4104803 | 1991-02-16 | ||
DE19914129838 DE4129838A1 (en) | 1991-02-16 | 1991-09-07 | PRESSURE VALVE FOR PACKAGING CONTAINERS |
DE4129838 | 1991-09-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0499783A1 true EP0499783A1 (en) | 1992-08-26 |
EP0499783B1 EP0499783B1 (en) | 1995-04-05 |
Family
ID=25901099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920100475 Expired - Lifetime EP0499783B1 (en) | 1991-02-16 | 1992-01-14 | Overpressure valve for packages |
Country Status (4)
Country | Link |
---|---|
US (2) | US5263777A (en) |
EP (1) | EP0499783B1 (en) |
JP (1) | JPH05112375A (en) |
DE (2) | DE4129838A1 (en) |
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US7721752B2 (en) | 2004-09-29 | 2010-05-25 | Robert Bosch Gmbh | Pressure relief valve for a packaging container |
WO2007113097A1 (en) * | 2006-04-06 | 2007-10-11 | Tesa Ag | Pressure-relief valve for a packaging container |
DE102006016594A1 (en) * | 2006-04-06 | 2007-10-18 | Tesa Ag | Pressure relief valve for a packaging container |
WO2010091910A1 (en) * | 2009-02-12 | 2010-08-19 | Robert Bosch Gmbh | Pressure relief valve for a packaging container |
WO2010091908A1 (en) * | 2009-02-12 | 2010-08-19 | Robert Bosch Gmbh | Pressure relief valve for a packaging container |
WO2011064051A1 (en) * | 2009-11-26 | 2011-06-03 | Robert Bosch Gmbh | Pressure relief valve for a packaging container |
CN102666306A (en) * | 2009-11-26 | 2012-09-12 | 罗伯特·博世有限公司 | Pressure relief valve for a packaging container |
Also Published As
Publication number | Publication date |
---|---|
JPH05112375A (en) | 1993-05-07 |
US5263777A (en) | 1993-11-23 |
DE59201802D1 (en) | 1995-05-11 |
US5326176A (en) | 1994-07-05 |
DE4129838A1 (en) | 1992-08-20 |
EP0499783B1 (en) | 1995-04-05 |
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