EP0216327A2 - Plastic bag for vacuum packages - Google Patents

Plastic bag for vacuum packages Download PDF

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Publication number
EP0216327A2
EP0216327A2 EP86112959A EP86112959A EP0216327A2 EP 0216327 A2 EP0216327 A2 EP 0216327A2 EP 86112959 A EP86112959 A EP 86112959A EP 86112959 A EP86112959 A EP 86112959A EP 0216327 A2 EP0216327 A2 EP 0216327A2
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EP
European Patent Office
Prior art keywords
channels
bag
layers
plastic bag
inner layer
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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.)
Granted
Application number
EP86112959A
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German (de)
French (fr)
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EP0216327A3 (en
EP0216327B1 (en
Inventor
Hanns J. Kristen
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TILIA INTERNATIONAL
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TILIA TRUST REG
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Priority to AT86112959T priority Critical patent/ATE57880T1/en
Publication of EP0216327A2 publication Critical patent/EP0216327A2/en
Publication of EP0216327A3 publication Critical patent/EP0216327A3/en
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Publication of EP0216327B1 publication Critical patent/EP0216327B1/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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
    • B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
    • B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
    • B65D81/2023—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum in a flexible container
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • 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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
    • B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
    • B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
    • B65D81/2038—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum with means for establishing or improving vacuum

Definitions

  • the invention relates to a plastic bag according to the preamble of claim 1.
  • This plastic bag is intended in particular for vacuum packaging of food.
  • Known plastic bags for this purpose are made of flat plastic films or tubes and have the disadvantage that it is hardly possible to create a vacuum in them by sucking out the air. Because these bags are filled with food, for example with a piece of meat and then from the still open side of the bag a suction nozzle, which is connected to a vacuum pump, inserted into the bag, after a short suction time the opposing walls of the bag will stick together in the area around the suction nozzle. The bag thus seals the tip of the suction nozzle, so that it is no longer possible to pump out the air. So there are air pockets in the bag, so that the packaged food spoils relatively quickly, especially due to the oxygen that is still present inside the bag.
  • the walls of the bag can also lie firmly against the food during suction, so that an intermediate seal takes place there and the air from the rear parts (in the region of the closed end of the bag) cannot be sucked off. Most of the time it can also be observed that the air is not extracted at the corners of the bag.
  • a multi-layer bag is known from US Pat. No. 3,809,217, with a flat outer layer and a meandering inner layer, these two layers being connected to one another. Due to the meandering structure of the inner layer, air pockets are present between the inner and the outer layer, so that this bag is not suitable for vacuum packaging of food. It has been found that the food-compatible plastics such. As polyethylene or polypropylene, are permeable to oxygen, so that at least the oxygen located between the two layers can diffuse into the interior of the bag and the food will spoil. So even if the outer layer is absolutely gas and therefore also is oxygen-tight, the air trapped between the two layers will still spoil the food.
  • the inner layer on the other hand, cannot be made of absolutely air-impermeable material, since all of the absolutely gastight plastics known today are not food-compatible. Incidentally, it is an essential purpose of the bag of US Pat. No. 3,809,217 to provide a relatively rigid packaging for flat objects, which also mechanically protects the packaged object and is intended to prevent the contents of the bag from being felt. For this reason, the bag is not suitable for foods that are usually not flat.
  • a two-layer bag for packaging articles is also known from US Pat. No. 4,093,068.
  • This bag has air cushions that protrude inwards to fix the contents of the packaging. For the above reasons, this bag is also unsuitable for vacuum packaging of food.
  • the object of the invention is to improve the plastic bag of the type mentioned in such a way that the air present in the interior of the bag can be completely sucked out before the vacuum is created.
  • this bag should also be made of food-compatible material and prevent the later penetration of air and especially oxygen.
  • the functional handling of the bag that is to say the creation of the vacuum and the sealing, should be so easy to carry out that these work steps can also be carried out in the normal household.
  • this object is achieved in a bag according to the preamble of claim 1 in that the inner layer 9 is made of thermoplastic material, that the outer layer 11 is made of a gas-impermeable material, that both layers 9 and 11 are connected to one another over the entire area, that at least the inner layer 9 is deformed in such a way that it has depressions or channels 13 on the exposed inside, and that these channels 13 are connected to one another in a grid-like manner.
  • polyethylene is preferably used as the inner layer.
  • Polypropylene is also an option. Both of these plastics are extremely food-resistant, ie there are no chemical reactions between food and these plastics. However, they are not absolutely airtight and in particular allow oxygen to diffuse through. In addition, these materials are usually not boil-proof and have only a comparatively low mechanical strength, so that they can be easily scratched in, which would then remove the vacuum again.
  • Their softening or flow temperature is of the order of 150 ° C to 160 ° C. Polyester is preferably used as the outer layer. Polyamide can also be used. These materials are not food-safe, which means that food that has been in contact with them for a long time will spoil. On the other hand, these materials are absolutely impermeable to oxygen. Your The flow or softening temperature is approx. 80 ° C higher than that of the materials of the inner layer.
  • these two layers are connected to one another over the full area, either by lamination or by coextrusion. So there are no air or oxygen inclusions between the two layers.
  • at least the inner layer, preferably both layers is now deformed or embossed in such a way that it has a multiplicity of channels on the inside of the inner layer, that is to say toward the food. These channels prevent the bag from collapsing completely when aspirated. This means that all the air can be sucked out of the bag without air pockets remaining anywhere.
  • the two layers are preferably deformed in the same direction. This has the advantage that the production of the bag is relatively simple. However, it would also be possible to form the outer layer flat and to provide only the inner layer with projections and depressions, so that only this inner layer has the channels.
  • the channels preferably run in a grid-like manner, that is to say they are connected to one another with regard to air flowing through them during suction.
  • a precisely described exemplary embodiment of the invention shows three sets of channels which run parallel to one another and which intersect. The "elevations" that then remain between these channels then have the shape of a triangle.
  • the channels can also increase with such channels exercises have other forms, such as B. rectangle, circle etc.
  • the bag is made cheaper by the fact that only one wall has the channels, while the other, opposite wall is flat or flat and has no channels.
  • this wall should also consist of two layers in order to achieve food compatibility and oxygen impermeability.
  • Fig. 1 shows the plastic bag 1, in the opening of which a nozzle 3 of a vacuum pump is inserted.
  • This nozzle has a relatively flat mouthpiece, so that the bag 1 in the region by means of clamping jaws 5 arranged on both sides, which consist for example of hard rubber this mouthpiece can be sealed when the jaws are pressed towards each other.
  • the walls of the bag consist of two layers, namely an inner layer 9 made of thermoplastic, which is food-compatible, and an outer layer 11 made of a flexible plastic, which is impermeable to air and, in particular, to oxygen.
  • the inner layer is deformed or embossed in such a way that it has a plurality of interconnected channels 13.
  • the vacuum pump (not shown) is switched on and the air is sucked out of the interior of the bag.
  • a complete collapse of the bag does not occur due to the channels 13, so that the air can be sucked out completely, so that a sufficient vacuum can be generated.
  • the mechanical pressure of the jaws 5 causes the bag to be tightly closed during the suction process.
  • the bag is heat-sealed by pressing down the sealing jaws 7. Thereafter, the jaws 5 and the sealing jaws 7 are removed from the bag and the nozzle 3 is pulled out.
  • the bags can be in the form of individual bags or in the form of a roll.
  • the inner layer 9 is shaped in such a way that it has rectangular projections 15, which in turn are arranged in such a way that continuous and interconnected channels 13 result between them.
  • Fig. 4 shows a further arrangement of projections 15 and channels 13.
  • the projections 15 are formed here as equilateral triangles, so that three sets of channels 13, 13 'and 13 ", which are each parallel to each other, are formed, each at an angle of Cut 60 °.
  • the inner layer 9 is plastically deformed and has regions 17 with a smaller wall thickness and regions 19 with a larger wall thickness alternately, as a result of which the channels 13 are formed.
  • the outer layer 11, on the other hand, is completely flat and fully connected to the likewise flat upper side of the inner layer 9.
  • the opposite wall also consists in this embodiment - similar to the embodiment of FIG. 3 - from two flat layers 9 'and 11'.
  • the inner layer preferably consists of polyethylene, which is food-grade is permanent, but is not absolutely impermeable to oxygen and also not boil-proof and finally has a relatively low strength.
  • the outer layer preferably consists of polyester or polyamide, which has good mechanical strengthening properties, is absolutely impermeable to air and in particular oxygen, but is not absolutely food-safe.
  • the plasticization temperature of the outer layer is of the order of magnitude of 240 ° C, while that of the inner layer is of the order of 150 ° C to 160 ° C. The temperature difference between the plasticizing temperature between the inner and outer layer is therefore approx. 80 ° C. If the outer layer is heated with the sealing jaws 7, this also heats the inner layer, which is then welded. Due to the higher plasticization and thus also melting temperature of the outer layer, there is also no danger that areas of the bag melt during sealing to such an extent that there are holes in them.
  • the total thickness of layers 9 and 11 of a wall is between 67 and 100 ⁇ m.
  • the outer layer has a thickness of the order of 12 to 15 microns, while the rest falls on the inner layer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Bag Frames (AREA)

Abstract

1. A plastic bag for vacuum packaging, in particular for vacuum packaging of food, in the case of which at least one wall consists of a plurality of interconnected layers, the inner layer (9) being made of a thermoplastic material and the outer layer (11) being made of a material which is impermeable to gas, said two layers (9, 11) being interconnected and at least the inner layer (9) being shaped in such a way that it includes recesses or channels (13) on the exposed inner surface, said channels (13) being interconnected so as to form a lattice like pattern, characterized in that the two layers (9, 11) are joined together over their entire surfaces and are shaped in the same manner.

Description

Die Erfindung betrifft einen Kunststoffbeutel gemäß dem Oberbegriff des Patentanspruches 1. Dieser Kunst­stoffbeutel soll insbesondere zur Vakuumverpackung von Nahrungsmitteln dienen.The invention relates to a plastic bag according to the preamble of claim 1. This plastic bag is intended in particular for vacuum packaging of food.

Bekannte Kunststoffbeutel zu diesem Zwecke sind aus ebenen Kunststofffolien oder - schläuchen hergestellt und haben den Nachteil, daß es kaum möglich ist, in ihnen durch Absaugen der Luft ein Vakuum zu erzeugen. Sind nämlich diese Beutel mit Nahrungsmitteln gefüllt, beispielsweise mit einem Stück Fleisch und wird dann von der noch offenen Seite des Beutels eine Absaugdüse, die an eine Vakuumpumpe angeschlossen ist, in den Beutel gesteckt, so werden nach kurzer Absaugzeit die einander gegenüberliegenden Wände des Beutels im Bereich um die Absaugdüse aneinander kleben. Der Beutel dichtet also die Spitze der Absaugdüse ab, so daß ein weiteres Abpumpen der Luft nicht mehr möglich ist. Es bleiben also Lufteinschlüsse im Beutel, so daß die verpackten Nahrungsmittel doch relativ schnell ver­derben, insbesondere aufgrund des noch vorhandenen Sauerstoffes im Inneren des Beutels. Weiterhin können während des Absaugens auch die Wände des Beutels an den Lebensmitteln fest anliegen, so daß dort eine Zwischen­dichtung stattfindet und die Luft aus hinteren Teilen (im Bereich des geschlossenen Endes des Beutels) nicht abgesaugt werden kann. Meistens ist auch zu beobachten, daß die Luft an den Ecken des Beutels nicht abgesaugt wird.Known plastic bags for this purpose are made of flat plastic films or tubes and have the disadvantage that it is hardly possible to create a vacuum in them by sucking out the air. Because these bags are filled with food, for example with a piece of meat and then from the still open side of the bag a suction nozzle, which is connected to a vacuum pump, inserted into the bag, after a short suction time the opposing walls of the bag will stick together in the area around the suction nozzle. The bag thus seals the tip of the suction nozzle, so that it is no longer possible to pump out the air. So there are air pockets in the bag, so that the packaged food spoils relatively quickly, especially due to the oxygen that is still present inside the bag. Furthermore, the walls of the bag can also lie firmly against the food during suction, so that an intermediate seal takes place there and the air from the rear parts (in the region of the closed end of the bag) cannot be sucked off. Most of the time it can also be observed that the air is not extracted at the corners of the bag.

Aus der US-PS 3 809 217 ist ein mehrschichtiger Beutel bekannt, mit einer flachen äußeren Schicht und einer mäanderförmig geprägten inneren Schicht, wobei diese beiden Schichten miteinander verbunden sind. Aufgrund der mäanderförmigen Struktur der inneren Schicht sind allerdings zwischen der inneren und der äußeren Schicht Lufteinschlüsse vorhanden, so daß dieser Beutel für die Vakuumverpackung von Nahrungsmitteln nicht geeignet ist. Es hat sich nämlich herausgestellt, daß die lebens­mittelverträglichen Kunststoffe, wie z. B. Polyethylen oder Polypropylen, sauerstoffdurchlässig sind, so daß zumindest der zwischen den beiden Schichten befindliche Sauerstoff in das Innere des Beutels eindiffundieren kann und die Lebensmittel verderben wird. Selbst wenn also die äußere Schicht absolut gas- und damit auch sauerstoffdicht ist, wird die zwischen den beiden Schichten eingeschlossene Luft noch die Lebensmittel verderben. Die innere Schicht kann dagegen nicht aus absolut luftundurchlässigem Material gemacht werden, da alle heute bekannten absolut gasdichten Kunststoffe nicht lebensmittelverträglich sind. Im übrigen ist es wesentlicher Zweck des Beutels der US-PS 3 809 217, eine relativ steife Verpackung für flache Gegenstände zu schaffen, die den verpackten Gegenstand auch mecha­nisch schützt und ein Ertasten des Beutelinhaltes ver­hindern soll. Für Lebensmittel, die meist nicht eine flache Form haben, ist daher auch aus diesem Grunde der Beutel nicht geeignet.A multi-layer bag is known from US Pat. No. 3,809,217, with a flat outer layer and a meandering inner layer, these two layers being connected to one another. Due to the meandering structure of the inner layer, air pockets are present between the inner and the outer layer, so that this bag is not suitable for vacuum packaging of food. It has been found that the food-compatible plastics such. As polyethylene or polypropylene, are permeable to oxygen, so that at least the oxygen located between the two layers can diffuse into the interior of the bag and the food will spoil. So even if the outer layer is absolutely gas and therefore also is oxygen-tight, the air trapped between the two layers will still spoil the food. The inner layer, on the other hand, cannot be made of absolutely air-impermeable material, since all of the absolutely gastight plastics known today are not food-compatible. Incidentally, it is an essential purpose of the bag of US Pat. No. 3,809,217 to provide a relatively rigid packaging for flat objects, which also mechanically protects the packaged object and is intended to prevent the contents of the bag from being felt. For this reason, the bag is not suitable for foods that are usually not flat.

Aus der US-PS 4 093 068 ist ebenfalls ein Zweischicht­beutel zur Verpackung von Gegenständen bekannt. Dieser Beutel hat nach innen ragende Luftkissen, die den Ver­packungsinhalt fixieren sollen. Aus obigen Gründen ist auch dieser Beutel für die Vakuumverpackung von Lebens­mitteln nicht geeignet.A two-layer bag for packaging articles is also known from US Pat. No. 4,093,068. This bag has air cushions that protrude inwards to fix the contents of the packaging. For the above reasons, this bag is also unsuitable for vacuum packaging of food.

Aufgabe der Erfindung ist es, den Kunststoffbeutel der eingangs genannten Art dahingehend zu verbessern, daß die im Inneren des Beutels vor der Erzeugung des Vakuums vorhandene Luft vollständig abgesaugt werden kann. Natürlich soll dieser Beutel auch aus lebensmittelver­träglichem Material sein und das spätere Eindringen von Luft und insbesondere von Sauerstoff verhindern. Schließlich soll die funktionsgerechte Handhabung des Beutels, also das Erzeugen des Vakuums und das Ver­siegeln so einfach durchzuführen sein, daß diese Ar­beitsschritte auch im normalen Haushalt durchgeführt werden können.The object of the invention is to improve the plastic bag of the type mentioned in such a way that the air present in the interior of the bag can be completely sucked out before the vacuum is created. Of course, this bag should also be made of food-compatible material and prevent the later penetration of air and especially oxygen. Finally, the functional handling of the bag, that is to say the creation of the vacuum and the sealing, should be so easy to carry out that these work steps can also be carried out in the normal household.

Erfindungsgemäß wird diese Aufgabe bei einem Beutel gemäß dem Oberbegriff des Patentanspruches 1 dadurch gelöst, daß die innere Schicht 9 aus thermoplasti­schem Kunststoff besteht, daß die äußere Schicht 11 aus einem gasundurchlässigen Material besteht, daß beide Schichten 9 und 11 vollflächig miteinander verbunden sind,daß zumindest die innere Schicht 9 derart verformt ist, daß sie Vertiefungen bzw. Kanäle 13 auf der bloßliegenden Innenseite aufweist, und daß diese Kanäle 13 gitterartig miteinander verbunden sind.According to the invention this object is achieved in a bag according to the preamble of claim 1 in that the inner layer 9 is made of thermoplastic material, that the outer layer 11 is made of a gas-impermeable material, that both layers 9 and 11 are connected to one another over the entire area, that at least the inner layer 9 is deformed in such a way that it has depressions or channels 13 on the exposed inside, and that these channels 13 are connected to one another in a grid-like manner.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen.Advantageous refinements and developments of the invention can be found in the subclaims.

Als innere Schicht wird nach der Erfindung bevorzugt Polyethylen verwendet. Auch Polypropylen kommt in Frage. Diese beiden Kunststoffe sind zwar in hervor­ragendem Maße lebensmittelbeständig, d. h. es finden keinerlei chemische Reaktionen zwischen Lebensmitteln und diesen Kunststoffen statt. Sie sind allerdings nicht absolut luftdicht und erlauben insbesondere das Durchdiffundieren von Sauerstoff. Darüber hinaus sind diese Materialien meist nicht kochfest und haben auch nur eine vergleichsweise geringe mechanische Festig­keit, so daß sie leicht eingeritzt werden können, womit dann das Vakuum wieder beseitigt würde. Ihre Erwei­chungs- bzw. Fließtemperatur liegt in der Größenordnung von 150°C bis 160°C. Als äußere Schicht wird vorzugs­weise Polyester verwendet. Es kommt auch Polyamid in Frage. Diese Materialien sind nicht lebensmittelbe­ständig, d. h. Lebensmittel, die mit ihnen über längere Zeit in Berührung stehen, verderben. Andererseits sind diese Materialien absolut sauerstoffundurchlässig. Ihre Fließ- bzw. Erweichungstemperatur liegt ca. 80°C höher als die der Materialien der inneren Schicht.According to the invention, polyethylene is preferably used as the inner layer. Polypropylene is also an option. Both of these plastics are extremely food-resistant, ie there are no chemical reactions between food and these plastics. However, they are not absolutely airtight and in particular allow oxygen to diffuse through. In addition, these materials are usually not boil-proof and have only a comparatively low mechanical strength, so that they can be easily scratched in, which would then remove the vacuum again. Their softening or flow temperature is of the order of 150 ° C to 160 ° C. Polyester is preferably used as the outer layer. Polyamide can also be used. These materials are not food-safe, which means that food that has been in contact with them for a long time will spoil. On the other hand, these materials are absolutely impermeable to oxygen. Your The flow or softening temperature is approx. 80 ° C higher than that of the materials of the inner layer.

Nach dem wesentlichen Grundgedanken der Erfindung sind diese beiden Schichten zum einen vollflächig miteinander verbunden, sei es durch Laminieren oder durch Koex­trudieren. Es sind also keinerlei Luft- oder Sauerstoff­einschlüsse zwischen den beiden Schichten vorhanden. Zusätzlich ist zumindest die innere Schicht, vorzugs­weise beide Schichten nun so verformt bzw. geprägt, daß sie eine Vielzahl von Kanälen an der nach innen, also zum Lebensmittel hin weisenden Seite der inneren Schicht hat. Diese Kanäle verhindern ein vollständiges Kollabieren des Beutels beim Absaugen. Damit kann also die gesamte Luft aus dem Beutel abgesaugt werden, ohne daß irgendwo Lufteinschlüsse verbleiben. Bevorzugt sind die beiden Schichten gleichlaufend verformt. Dies hat den Vorteil, daß die Herstellung des Beutels relativ einfach ist. Es wäre aber auch möglich, die äußere Schicht eben auszubilden und nur die innere Schicht mit Vorsprüngen und Vertiefungen zu versehen, so daß nur diese innere Schicht die Kanäle besitzt.According to the essential basic idea of the invention, these two layers are connected to one another over the full area, either by lamination or by coextrusion. So there are no air or oxygen inclusions between the two layers. In addition, at least the inner layer, preferably both layers, is now deformed or embossed in such a way that it has a multiplicity of channels on the inside of the inner layer, that is to say toward the food. These channels prevent the bag from collapsing completely when aspirated. This means that all the air can be sucked out of the bag without air pockets remaining anywhere. The two layers are preferably deformed in the same direction. This has the advantage that the production of the bag is relatively simple. However, it would also be possible to form the outer layer flat and to provide only the inner layer with projections and depressions, so that only this inner layer has the channels.

Vorzugsweise verlaufen die Kanäle gitterartig, sind also hinsichtlich einer beim Absaugen durch sie strö­menden Luft miteinander verbunden. Von den vielen denk­baren Ausführungsbeispielen der Anordnung solcher Kanäle zeigt ein präzises beschriebenes Ausführungsbeispiel der Erfindung drei Scharen von jeweils parallel zu­einander verlaufenden Kanälen, die sich kreuzen. Die zwischen diesen Kanälen dann stehenbleibenden "Erhe­bungen" haben dann die Form eines Dreiecks. Allerdings können auch bei derart verlaufenden Kanälen die Erhe­ bungen andere Formen haben, wie z. B. Rechteck, Kreis etc.The channels preferably run in a grid-like manner, that is to say they are connected to one another with regard to air flowing through them during suction. Of the many conceivable exemplary embodiments of the arrangement of such channels, a precisely described exemplary embodiment of the invention shows three sets of channels which run parallel to one another and which intersect. The "elevations" that then remain between these channels then have the shape of a triangle. However, the channels can also increase with such channels exercises have other forms, such as B. rectangle, circle etc.

Eine Verbilligung des Beutels erhält man nach einer weiteren Variante der Erfindung dadurch, daß nur die eine Wand die Kanäle hat, während die andere, gegen­überliegende Wand eben bzw. flach ist und keine Kanäle hat. Auch diese Wand sollte jedoch aus zwei Schichten bestehen, um die Lebensmittelverträglichkeit und die Sauerstoffundurchlässigkeit zu erreichen. Natürlich ist es auch möglich, beide gegenüberliegenden Wände des Beutels mit den Kanälen zu versehen.According to a further variant of the invention, the bag is made cheaper by the fact that only one wall has the channels, while the other, opposite wall is flat or flat and has no channels. However, this wall should also consist of two layers in order to achieve food compatibility and oxygen impermeability. Of course, it is also possible to provide the channels on both opposite walls of the bag.

Im folgenden wird die Erfindung anhand von Ausführungs­beispielen im Zusammenhang mit der Zeichnung ausführ­licher erläutert. Es zeigt:

  • Fig. 1 eine perspektivische Ansicht des Kunststoff­beutels im Zusammenhang mit der Düse einer Vakuumpumpe und einer Vorrichtung zum Ver­siegeln des Beutels;
  • Fig. 2 eine vergrößerte Teilansicht der Innenseite des Beutels;
  • Fig. 3 eine vergrößerte Schnittansicht des Beutels;
  • Fig. 4 eine Draufsicht auf die Innenseite einer Variante des Beutels; und
  • Fig. 5 eine Schnittansicht einer weiteren Variante des Beutels.
The invention is explained in more detail below on the basis of exemplary embodiments in conjunction with the drawing. It shows:
  • Figure 1 is a perspective view of the plastic bag in connection with the nozzle of a vacuum pump and a device for sealing the bag.
  • Figure 2 is an enlarged partial view of the inside of the bag.
  • Fig. 3 is an enlarged sectional view of the bag;
  • Figure 4 is a plan view of the inside of a variant of the bag. and
  • Fig. 5 is a sectional view of a further variant of the bag.

Fig. 1 zeigt den Kunststoffbeutel 1, in dessen Öffnung eine Düse 3 einer Vakuumpumpe eingeschoben ist. Diese Düse hat ein relativ flaches Mundstück, so daß der Beutel 1 durch beidseitig angeordnete Klemmbacken 5, die beispielsweise aus Hartgummi bestehen, im Bereich dieses Mundstückes abgedichtet werden kann, wenn die Klemmbacken in Richtung aufeinanderzu gedrückt werden. Die Wände des Beutels bestehen aus zwei Schichten, nämlich einer inneren Schicht 9 aus thermoplastischem Kunststoff, der lebensmittelverträglich ist sowie einer äußeren Schicht 11 aus einem flexiblen Kunst­stoff, der Luft- und insbesondere sauerstoffundurch­lässig ist. Die innere Schicht ist derart verformt bzw. geprägt, daß sie mehrere miteinander verbundene Kanäle 13 besitzt. Ist die Öffnung des Beutels durch die Klemmbacken 5 und auch an der Ober- und Unterseite des flachen Mundstückes der Düse 3 verschlossen, so wird die nicht dargestellte Vakuumpumpe eingeschaltet und die Luft aus dem inneren des Beutels wird abge­saugt. Ein vollständiges Kollabieren des Beutels tritt jedoch aufgrund der Kanäle 13 nicht auf, so daß die Luft vollständig abgesaugt werden kann, so daß ein ausreichendes Vakuum erzeugt werden kann. Der mecha­nische Druck der Klemmbacken 5 bewirkt, daß der Beutel während des Absaugvorganges dicht verschlossen ist. Ist das ausreichende Vakuum hergestellt, so wird der Beutel durch Niederdrücken der Siegelbacken 7 heiß versiegelt. Danach werden die Klemmbacken 5 und die Siegelbacken 7 von dem Beutel entfernt und die Düse 3 wird herausgezogen. Die Beutel können als einzelne Beutel oder in Form einer Rolle vorliegen.Fig. 1 shows the plastic bag 1, in the opening of which a nozzle 3 of a vacuum pump is inserted. This nozzle has a relatively flat mouthpiece, so that the bag 1 in the region by means of clamping jaws 5 arranged on both sides, which consist for example of hard rubber this mouthpiece can be sealed when the jaws are pressed towards each other. The walls of the bag consist of two layers, namely an inner layer 9 made of thermoplastic, which is food-compatible, and an outer layer 11 made of a flexible plastic, which is impermeable to air and, in particular, to oxygen. The inner layer is deformed or embossed in such a way that it has a plurality of interconnected channels 13. If the opening of the bag is closed by the clamping jaws 5 and also on the top and bottom of the flat mouthpiece of the nozzle 3, the vacuum pump (not shown) is switched on and the air is sucked out of the interior of the bag. A complete collapse of the bag does not occur due to the channels 13, so that the air can be sucked out completely, so that a sufficient vacuum can be generated. The mechanical pressure of the jaws 5 causes the bag to be tightly closed during the suction process. Once the sufficient vacuum has been established, the bag is heat-sealed by pressing down the sealing jaws 7. Thereafter, the jaws 5 and the sealing jaws 7 are removed from the bag and the nozzle 3 is pulled out. The bags can be in the form of individual bags or in the form of a roll.

Aus Fig. 2 ist ein Ausführungsbeispiel der Kanäle 13 besser zu erkennen. Die innere Schicht 9 ist so ge­prägt, daß sie rechteckige Vorsprünge 15 hat, die ihrerseits so angeordnet sind, daß sich zwischen ihnen durchgehende und miteinander verbundene Kanäle 13 er­geben.An embodiment of the channels 13 can be seen better from FIG. The inner layer 9 is shaped in such a way that it has rectangular projections 15, which in turn are arranged in such a way that continuous and interconnected channels 13 result between them.

Aus Fig. 3 ist zu erkennen, daß die Verformung zur Bildung der Kanäle 13 sowohl an der inneren Schicht 9 als auch an der äußeren Schicht 11 vorgenommen wurde, wobei beide Schichten vollflächig miteinander verbunden sind. Weiterhin ist Fig. 3 zu entnehmen, daß nur eine Wand des Beutels diese Verformungen und Kanäle 13 auf­weisen muß, während die gegenüberliegende Wand aus zwei ebenen Schichten 9' und 11' besteht, die von ihrem Material her den Schichten 9 und 11 entsprechen. Selbst wenn sich die beiden gegenüberliegenden Wände des Beutels berühren, so bleiben bis zur Erzeugung des benötigten Vakuums doch die Kanäle 13 erhalten.From Fig. 3 it can be seen that the deformation to form the channels 13 was carried out both on the inner layer 9 and on the outer layer 11, both layers being connected to one another over the entire surface. 3 that only one wall of the bag must have these deformations and channels 13, while the opposite wall consists of two flat layers 9 'and 11', the material of which corresponds to layers 9 and 11. Even if the two opposite walls of the bag touch, the channels 13 are retained until the required vacuum is created.

Fig. 4 zeigt eine weitere Anordnung von Vorsprüngen 15 und Kanälen 13. Die Vorsprünge 15 sind hierbei als gleichseitige Dreiecke ausgebildet, so daß drei Scharen von jeweils zueiander parallelen Kanälen 13, 13' und 13" gebildet werden, die sich jeweils unter einem Winkel von 60° schneiden.Fig. 4 shows a further arrangement of projections 15 and channels 13. The projections 15 are formed here as equilateral triangles, so that three sets of channels 13, 13 'and 13 ", which are each parallel to each other, are formed, each at an angle of Cut 60 °.

Fig. 5 zeigt schließlich eine weitere Variante, bei der die innere Schicht 9 plastisch verformt ist und dabei abwechselnd Bereiche 17 mit geringerer Wandstärke und Bereiche 19 mit größerer Wandstärke besitzt, wo­durch die Kanäle 13 gebildet werden. Die äußere Schicht 11 ist dagegen vollständig eben und vollflächig mit der ebenfalls ebenen Oberseite der inneren Schicht 9 verbunden. Die gegenüberliegende Wand besteht auch bei diesem Ausführungsbeispiel - ähnlich wie bei dem Ausführungsbeispiel der Fig. 3 - aus zwei ebenen Schichten 9' und 11'.5 finally shows a further variant in which the inner layer 9 is plastically deformed and has regions 17 with a smaller wall thickness and regions 19 with a larger wall thickness alternately, as a result of which the channels 13 are formed. The outer layer 11, on the other hand, is completely flat and fully connected to the likewise flat upper side of the inner layer 9. The opposite wall also consists in this embodiment - similar to the embodiment of FIG. 3 - from two flat layers 9 'and 11'.

Wie eingangs erwähnt, besteht die innere Schicht vor­zugsweise aus Polyethylen, das zwar lebensmittelbe­ ständig ist, jedoch nicht absolut sauerstoffundurch­lässig sowie auch nicht kochfest und schließlich eine relativ geringe Festigkeit aufweist. Die äußere Schicht besteht dagegen vorzugsweise aus Polyester oder Poly­amid, das gute mechanische Festigungseigenschaften hat, absolut luft- und insbesondere sauerstoffundurch­lässig ist, nicht jedoch absolut lebensmittelbeständig ist. Die Plastifizierungstemperatur der äußeren Schicht liegt etwa in der Größenordnung von 240°c, während die der inneren Schicht in der Größenordnung von 150°C bis 160°C liegt. Die Temperaturdifferenz der Plastifizie­rungstemperatur zwischen innerer und äußerer Schicht liegt damit bei ca. 80°C. Wird mit den Siegelbacken 7 die äußere Schicht erwärmt, so wird dadurch auch die innere Schicht erwärmt, die dann verschweißt wird. Aufgrund der höheren Plastifizierungs- und damit auch Schmelztemperatur der äußeren Schicht besteht auch nicht die Gefahr, daß während des Versiegelns Bereiche des Beutels soweit durchschmelzen, daß dort Löcher bestehen.As mentioned at the beginning, the inner layer preferably consists of polyethylene, which is food-grade is permanent, but is not absolutely impermeable to oxygen and also not boil-proof and finally has a relatively low strength. The outer layer, on the other hand, preferably consists of polyester or polyamide, which has good mechanical strengthening properties, is absolutely impermeable to air and in particular oxygen, but is not absolutely food-safe. The plasticization temperature of the outer layer is of the order of magnitude of 240 ° C, while that of the inner layer is of the order of 150 ° C to 160 ° C. The temperature difference between the plasticizing temperature between the inner and outer layer is therefore approx. 80 ° C. If the outer layer is heated with the sealing jaws 7, this also heats the inner layer, which is then welded. Due to the higher plasticization and thus also melting temperature of the outer layer, there is also no danger that areas of the bag melt during sealing to such an extent that there are holes in them.

In einer praktischen Ausführung liegt die Gesamtdicke der Schichten 9 und 11 einer Wand zwischen 67 und 100µm. Die äußere Schicht hat dabei eine Dicke in der Größen­ordnung von 12 bis 15 µ, während der Rest auf die innere Schicht fällt.In a practical embodiment, the total thickness of layers 9 and 11 of a wall is between 67 and 100 µm. The outer layer has a thickness of the order of 12 to 15 microns, while the rest falls on the inner layer.

Sämtliche in den Patentansprüchen, der Beschreibung und der Zeichnung dargestellten technischen Einzel­heiten können sowohl für sich als auch in beliebiger Kombination miteinander erfindungswesentlich sein.All of the technical details shown in the claims, the description and the drawing can be essential to the invention both individually and in any combination with one another.

Claims (7)

1. Kunststoffbeutel zur Vakuumverpackung insbesondere zur Vakuumverpackung von Nahrungsmitteln, bei dem mindestens eine Wand aus mehreren miteinander ver­bundenen Schichten besteht, dadurch gekennzeich­net,
- daß die innere Schicht (9) aus thermoplasti­schem Kunststoff besteht,
- daß die äußere Schicht (11) aus einem gasun­durchlässigen Material besteht,
- daß beide Schichten (9) und (11) vollflächig miteinander verbunden sind,
- daß zumindest die innere Schicht (9) derart verformt ist, daß sie Vertiefungen bzw. Kanäle (13) auf der bloßliegenden Innenseite aufweist, und
- daß diese Kanäle (13) gitterartig miteinander verbunden sind.1. Plastic bag for vacuum packaging, in particular for vacuum packaging of food, in which at least one wall consists of several interconnected layers, characterized in that
- That the inner layer (9) consists of thermoplastic material,
- That the outer layer (11) consists of a gas-impermeable material,
- that the two layers (9) and (11) are connected to one another over the full area,
- That at least the inner layer (9) is deformed such that it has depressions or channels (13) on the exposed inside, and
- That these channels (13) are interconnected like a grid. 2. Kunststoffbeutel nach Anspruch 1, dadurch gekenn­zeichnet, daß die innere Schicht (9) aus Poly­ethylen oder Polypropylen ist.2. Plastic bag according to claim 1, characterized in that the inner layer (9) is made of polyethylene or polypropylene. 3. Kunststoffbeutel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die äußere Schicht (11) aus Polyester oder Polyamid ist.3. Plastic bag according to claim 1 or 2, characterized in that the outer layer (11) is made of polyester or polyamide. 4. Kunststoffbeutel nach Anspruch 1, 2 oder 3, da­durch gekennzeichnet, daß beide Schichten gleich­laufend verformt sind.4. Plastic bag according to claim 1, 2 or 3, characterized in that both layers are deformed in the same direction. 5. Kunststoffbeutel nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die zwischen den Kanälen (13) vorhandenen Erhöhungen bzw. Vor­sprünge (15) die Form eines Dreiecks haben, so daß drei Scharen (13, 13', 13") sich kreuzender Kanäle vorhanden sind.5. Plastic bag according to one of claims 1 to 4, characterized in that the elevations or projections (15) present between the channels (13) have the shape of a triangle, so that three groups (13, 13 ', 13 ") themselves crossing channels are available. 6. Kunststoffbeutel nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß nur eine Wand des Beutels Kanäle hat, während die andere Wand aus einer ebenen Schicht besteht.6. Plastic bag according to one of claims 1 to 5, characterized in that only one wall of the bag has channels, while the other wall consists of a flat layer. 7. Kunststoffbeutel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß nur eine Wand des Beutels die Kanäle (13) aufweist, während die andere Wand aus zwei ebenen Schichten (9', 11') besteht, die hinsichtlich ihres Materiales den Schichten (9, 11) der erstgenannetn Wand des Beutels entsprechen.7. Plastic bag according to one of claims 1 to 6, characterized in that only one wall of the bag has the channels (13) while the other wall consists of two flat layers (9 ', 11'), which correspond in terms of their material to the layers (9, 11) of the first-mentioned wall of the bag.
EP19860112959 1985-09-23 1986-09-19 Plastic bag for vacuum packages Expired - Lifetime EP0216327B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86112959T ATE57880T1 (en) 1985-09-23 1986-09-19 PLASTIC BAGS FOR VACUUM PACKING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US77887585A 1985-09-23 1985-09-23
US778875 1985-09-23

Publications (3)

Publication Number Publication Date
EP0216327A2 true EP0216327A2 (en) 1987-04-01
EP0216327A3 EP0216327A3 (en) 1988-08-03
EP0216327B1 EP0216327B1 (en) 1990-10-31

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ID=25114656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860112959 Expired - Lifetime EP0216327B1 (en) 1985-09-23 1986-09-19 Plastic bag for vacuum packages

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EP (1) EP0216327B1 (en)
AT (1) ATE57880T1 (en)
DE (1) DE3675310D1 (en)
HK (1) HK26595A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990008070A2 (en) * 1989-01-13 1990-07-26 INDAG Gesellschaft für Industriebedarf mbH Plastic bag
EP0648688A2 (en) * 1993-10-13 1995-04-19 FLAEM NUOVA S.p.A. Tubular element for the formation of bags for the vacuum-packing of products
DE29505187U1 (en) * 1995-03-28 1995-07-20 David, Stephan, 02625 Bautzen Bags for vacuum packaging machines
EP1999028A2 (en) * 2006-03-14 2008-12-10 Scholle Corporation Collapsible bag for dispensing liquids and method
DE102011101177A1 (en) * 2011-05-11 2012-11-15 Jura-Plast Gmbh bag
CN113788218A (en) * 2021-08-13 2021-12-14 张敏 Food packaging bag

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4246115A3 (en) 2017-10-03 2024-01-03 EMD Millipore Corporation Integrity testing of bioprocessing containers

Citations (2)

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Publication number Priority date Publication date Assignee Title
DE1761403A1 (en) * 1967-05-18 1971-07-01 Natron Papier Ind Gmbh Packaging material, especially for bags, as well as the method and device for its manufacture
DE2332927A1 (en) * 1972-06-30 1974-01-10 Jintan Terumo Co PACKAGING

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
DE1761403A1 (en) * 1967-05-18 1971-07-01 Natron Papier Ind Gmbh Packaging material, especially for bags, as well as the method and device for its manufacture
DE2332927A1 (en) * 1972-06-30 1974-01-10 Jintan Terumo Co PACKAGING

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5433526A (en) * 1989-01-13 1995-07-18 Indag Gesellschaft Fur Industriebedarf Mbh Flexible bag
EP0383020A2 (en) * 1989-01-13 1990-08-22 Indag Gesellschaft Für Industriebedarf Mbh Plastic bag
WO1990008070A3 (en) * 1989-01-13 1990-09-07 Indag Gmbh Plastic bag
EP0383020A3 (en) * 1989-01-13 1990-11-22 Indag Gesellschaft Fur Industriebedarf Mbh Plastic bag
WO1990008070A2 (en) * 1989-01-13 1990-07-26 INDAG Gesellschaft für Industriebedarf mbH Plastic bag
EP0648688A2 (en) * 1993-10-13 1995-04-19 FLAEM NUOVA S.p.A. Tubular element for the formation of bags for the vacuum-packing of products
EP0648688A3 (en) * 1993-10-13 1995-06-21 Flaem Nuova Spa Tubular element for the formation of bags for the vacuum-packing of products.
DE29505187U1 (en) * 1995-03-28 1995-07-20 David, Stephan, 02625 Bautzen Bags for vacuum packaging machines
EP1999028A2 (en) * 2006-03-14 2008-12-10 Scholle Corporation Collapsible bag for dispensing liquids and method
EP1999028A4 (en) * 2006-03-14 2011-01-12 Scholle Corp Collapsible bag for dispensing liquids and method
DE102011101177A1 (en) * 2011-05-11 2012-11-15 Jura-Plast Gmbh bag
CN113788218A (en) * 2021-08-13 2021-12-14 张敏 Food packaging bag
CN113788218B (en) * 2021-08-13 2023-09-29 平江县向阳实业有限公司 Food packaging bag

Also Published As

Publication number Publication date
EP0216327A3 (en) 1988-08-03
EP0216327B1 (en) 1990-10-31
HK26595A (en) 1995-03-10
DE3675310D1 (en) 1990-12-06
ATE57880T1 (en) 1990-11-15

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