EP0216327B1 - Plastic bag for vacuum packages - Google Patents
Plastic bag for vacuum packages Download PDFInfo
- Publication number
- EP0216327B1 EP0216327B1 EP19860112959 EP86112959A EP0216327B1 EP 0216327 B1 EP0216327 B1 EP 0216327B1 EP 19860112959 EP19860112959 EP 19860112959 EP 86112959 A EP86112959 A EP 86112959A EP 0216327 B1 EP0216327 B1 EP 0216327B1
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- European Patent Office
- Prior art keywords
- bag
- channels
- layers
- plastic bag
- layer
- 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.)
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Classifications
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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
- 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
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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
- 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
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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
- 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.
- a plastic bag is known from US-A 2 778 173.
- US-A 2 778 173 When packaging food in airtight bags in plastic bags, it is desirable not to have any air pockets inside the bag.
- one or both sides of the bag are provided with projections or elevations, so that when the layer is in contact with the goods to be packaged, channels are formed between the layer and the goods which form a allow complete suction of the air inside the bag.
- the elevations or projections between the channels are triangular or semicircular in cross-sectional view and circular or square in plan view of the layer.
- the surface facing the outside of the bag is flat, with the result that the wall thickness of the inner, deformed layer is not uniform.
- This in turn means that there is an additional material requirement for the projections, since the strength is determined more by the thinnest points.
- This also makes welding more difficult, since perfect, airtight welding in the area of the projections can only be achieved in practice if the material of the elevations is melted away. However, this is often a cause for leaks. If, on the other hand, welding is less intensive, there is a risk of air pockets.
- Such an inner layer with elevations can practically only be obtained by extrusion.
- 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.
- the meandering structure of the inner layer air bubbles are present between the inner and the outer layer, so that this bag is not suitable for vacuum packaging of food.
- 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 will spoil the food. So even if the outer layer is absolutely gas-tight and therefore also 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 protects the packaged object mechanically 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 with a bag according to the preamble of the patent ches 1 solved in that both layers (9, 11) are connected to each other over the entire surface and deformed in the same direction.
- 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. Their 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, be it 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, ie 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. It is important that the two layers are deformed in the same direction. This has the advantage that the production of the bag is relatively simple.
- the channels run like a grid, so they are connected to each other with regard to air flowing through them during suction.
- a precisely described exemplary embodiment of the invention shows three sets of channels that run parallel to one another and each intersect at one point.
- the "elevations" that then remain between these channels then have the shape of a triangle.
- the channels running in this way may also have other shapes, e.g. 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 can be sealed in the region of this mouthpiece by clamping jaws 5 arranged on both sides, which consist for example of hard rubber, when the clamping jaws are pressed towards one another.
- 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 inside 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 clamping 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. 3 shows that only one wall of the bag Deformations and channels 13 must have, while the opposite wall consists of two flat layers 9 'and 11', the material of which correspond to the 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 shows a further arrangement of projections 15 and channels 13.
- the projections 15 are formed as equilateral triangles, so that three sets of channels 13, 13 'and 13 "are formed which are parallel to each other and which are each at an angle of Cut 60 °
- the inner layer is preferably made of polyethylene, which is food-resistant, but is not absolutely impermeable to oxygen and also not boil-proof and ultimately has a relatively low strength.
- the outer layer is preferably made of polyester or polyamide, which has good mechanical strength properties, is absolutely impermeable to air and in particular oxygen, but is not absolutely food-resistant.
- the plasticization temperature of the outer layer is approximately in the order of 240 ° C, while that of the inner layer is in the order of 150 ° C to 160 ° C. The temperature difference between the plasticizing temperature between the inner and outer layers is thus approximately 80 ° C. If the outer layer is heated with the sealing jaws 7, the inner layer is also heated, 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 the sealing process to such an extent that there are holes there.
- the total thickness of the layers 9 and 11 of a wall is between 67 and 100 wm.
- 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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Abstract
Description
Die Erfindung betrifft einen Kunststoffbeutel gemäß dem Oberbegriff des Patentanspruches 1. Ein solcher Kunststoffbeutel ist aus der US-A 2 778 173 bekannt. Bei der luftdichten Verpackung von Nahrungsmitteln in Kunststoffbeuteln ist es wünschenswert, möglichst keinerlei Lufteinschlüsse im Inneren des Beutels zu haben. Zu diesem Zwecke sind bei der US-A 2 778 173 eine oder beide Seiten des Beutels mit Vorsprüngen bzw. Erhebungen versehen, so daß sich, wenn die Schicht an dem zu verpackenden Gut anliegt, zwischen der Schicht und dem Gut Kanäle bilden, die ein vollständiges Absaugen der im Inneren des Beutels vorhandenen Luft ermöglichen. Bei dem bekannten Beutel sind die zwischen den Kanälen vorhandenen Erhöhungen bzw. Vorsprünge in der Querschnittansicht dreieck-oder halbkreisförmig und in der Draufsicht auf die Ebene der Schicht kreisförmig oder quadratisch. Bei einer dort gezeigten Variante mit zwei Schichten ist die zur Außenseite des Beutels weisende Fläche eben, was zur Folge hat, daß die Wandstärke der inneren, verformten Schicht nicht gleichförmig ist. Dies wiederum hat zur Folge, daß für die Vorsprünge ein zusätzlicher Materialbedarf vorhanden ist, da die Festigkeit eher, durch die dünnsten Stellen bestimmt wird. Auch wird hierdurch das Verschweißen erschwert, da ein einwandfreies, luftdichtes Verschweißen im Bereich der Vorsprünge praktisch nur dann erreicht werden kann, wenn das Material der Erhebungen weggeschmolzen wird. Dies ist aber oftmals wieder Anlaß zu Undichtigkeiten. Wird dagegen weniger intensiv verschweißt, so besteht die Gefahr von Lufteinschlüssen. Auch läßt sich eine derartige Innenschicht mit Erhebungen praktisch nur durch Extrodieren erhalten.The invention relates to a plastic bag according to the preamble of claim 1. Such a plastic bag is known from US-A 2 778 173. When packaging food in airtight bags in plastic bags, it is desirable not to have any air pockets inside the bag. For this purpose, in US-A 2 778 173 one or both sides of the bag are provided with projections or elevations, so that when the layer is in contact with the goods to be packaged, channels are formed between the layer and the goods which form a allow complete suction of the air inside the bag. In the known bag, the elevations or projections between the channels are triangular or semicircular in cross-sectional view and circular or square in plan view of the layer. In a variant with two layers shown there, the surface facing the outside of the bag is flat, with the result that the wall thickness of the inner, deformed layer is not uniform. This in turn means that there is an additional material requirement for the projections, since the strength is determined more by the thinnest points. This also makes welding more difficult, since perfect, airtight welding in the area of the projections can only be achieved in practice if the material of the elevations is melted away. However, this is often a cause for leaks. If, on the other hand, welding is less intensive, there is a risk of air pockets. Such an inner layer with elevations can practically only be obtained by extrusion.
Bei einer weiteren Variante der US-A 2 778 173 ist nur eine Schicht vorhanden, bei der die Vorsprünge bzw. Erhebungen auf der einen Seite durch Materialverformung erzeugt werden, der Gestalt, daß auf der anderen Seite der Schicht entsprechende Vertiefungen vorhanden sind. Damit erhält man zwar senkrecht zur Ebene der Schicht eine gleichmäßige Materialstärke, jedoch nicht senkrecht zum Verlauf der geformten Oberfläche, so daß die Reißfestigkeit geringer ist, als die des unverformten Ausgangsmateriales. Ein zweischichtiger Aufbau ist bei dieser Variante nicht gezeigt. Er hätte auch das Problem von Lufteinschlüsssen zwischen den beiden Schichten.In a further variant of US Pat. No. 2,778,173, there is only one layer in which the projections or elevations on one side are produced by material deformation, the shape such that corresponding depressions are present on the other side of the layer. This results in a uniform material thickness perpendicular to the plane of the layer, but not perpendicular to the shape of the shaped surface, so that the tensile strength is lower than that of the undeformed starting material. A two-layer structure is not shown in this variant. He would also have the problem of air pockets between the two layers.
Weitere bekannte Kunststoffbeutel zu diesem Zwecke sind aus ebenen Kunststoffolien 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.Other 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. If these bags are filled with food, for example with a piece of meat and then a suction nozzle, which is connected to a vacuum pump, is inserted into the bag from the still open side of the bag, after a short suction time the opposite walls of the bag are Glue the area around the suction nozzle together. 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 Lufteinschüsse 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 meachnisch 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. However, due to the meandering structure of the inner layer, air bubbles 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 will spoil the food. So even if the outer layer is absolutely gas-tight and therefore also 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 protects the packaged object mechanically 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 beide Schichten (9, 11) vollflächig miteinander verbunden und gleichlaufend verformt sind.According to the invention, this object is achieved with a bag according to the preamble of the patent ches 1 solved in that both layers (9, 11) are connected to each other over the entire surface and deformed in the same direction.
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. Their flow or softening temperature is approx. 80 ° C higher than that of the materials of the inner layer.
Bei 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. Wichtig ist, daß die beiden Schichten gleichlaufend verformt sind. Dies hat den Vorteil, daß die Herstellung des Beutels relativ einfach ist.In the invention, these two layers are connected to one another over the full area, be it 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, ie 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. It is important that the two layers are deformed in the same direction. This has the advantage that the production of the bag is relatively simple.
Die Kanäle verlaufen 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 jeweils in einem Punkt kreuzen. Die zwischen diesen Kanälen dann stehenbleibenden "Erhebungen" haben dann die Form eines Dreiecks. Allerdings können auch die derart verlaufenden Kanälen die Erhebungen andere Formen haben, wie z.B. Rechteck, Kreis etc.The channels run like a grid, so they are connected to each other 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 that run parallel to one another and each intersect at one point. The "elevations" that then remain between these channels then have the shape of a triangle. However, the channels running in this way may also have other shapes, e.g. 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.
- 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;
- Fig. 4 is a plan view of the inside of a 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 Beuteils 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 verschlosssen 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
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
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
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 zueinander parallelen Kanälen 13, 13' und 13" gebildet werden, die sich jeweils unter einem Winkel von 60° schneidenFig. 4 shows a further arrangement of
Wie eingangs erwähnt, besteht die innere Schicht vorzugsweise aus Polyethylen, das zwar lebensmittelbeständig 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 Festigkeitseigenschaften 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 Versiegeins Bereiche des Beutels soweit durchschmelzen, daß dort Löcher bestehen.As mentioned at the beginning, the inner layer is preferably made of polyethylene, which is food-resistant, but is not absolutely impermeable to oxygen and also not boil-proof and ultimately has a relatively low strength. The outer layer, on the other hand, is preferably made of polyester or polyamide, which has good mechanical strength properties, is absolutely impermeable to air and in particular oxygen, but is not absolutely food-resistant. The plasticization temperature of the outer layer is approximately in the order of 240 ° C, while that of the inner layer is in the order of 150 ° C to 160 ° C. The temperature difference between the plasticizing temperature between the inner and outer layers is thus approximately 80 ° C. If the outer layer is heated with the sealing
In einer praktischen Ausführung liegt die Gesamtdicke der Schichten 9 und 11 einer Wand zwischen 67 und 100 wm. Die äußere Schicht hat dabei eine Dicke in der Größenordnung von 12 bis 15 u, während der Rest auf die innere Schicht fällt.In a practical embodiment, the total thickness of the
Claims (6)
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 EP0216327A2 (en) | 1987-04-01 |
| EP0216327A3 EP0216327A3 (en) | 1988-08-03 |
| EP0216327B1 true EP0216327B1 (en) | 1990-10-31 |
Family
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 |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0216327B1 (en) |
| AT (1) | ATE57880T1 (en) |
| DE (1) | DE3675310D1 (en) |
| HK (1) | HK26595A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8900366U1 (en) * | 1989-01-13 | 1989-08-03 | Indag Gesellschaft für Industriebedarf mbH, 69214 Eppelheim | Foil bags |
| IT231279Y1 (en) * | 1993-10-13 | 1999-08-02 | Abate Luigi | TUBULAR ELEMENT FOR THE FORMATION OF BAGS FOR THE PACKAGING OF VACUUM PRODUCTS |
| DE29505187U1 (en) * | 1995-03-28 | 1995-07-20 | David, Stephan, 02625 Bautzen | Bags for vacuum packaging machines |
| US20070217718A1 (en) * | 2006-03-14 | 2007-09-20 | Kenneth Micnerski | Collapsible bag for dispensing liquids and method |
| DE102011101177A1 (en) * | 2011-05-11 | 2012-11-15 | Jura-Plast Gmbh | bag |
| CN113788218B (en) * | 2021-08-13 | 2023-09-29 | 平江县向阳实业有限公司 | Food packaging bag |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT276220B (en) * | 1967-05-18 | 1969-11-25 | Natron Papier Ind Ges M B H | Method for producing a packaging material, in particular for sacks |
| JPS5416279B2 (en) * | 1972-06-30 | 1979-06-21 |
-
1986
- 1986-09-19 DE DE8686112959T patent/DE3675310D1/en not_active Expired - Lifetime
- 1986-09-19 AT AT86112959T patent/ATE57880T1/en not_active IP Right Cessation
- 1986-09-19 EP EP19860112959 patent/EP0216327B1/en not_active Expired - Lifetime
-
1995
- 1995-03-02 HK HK26595A patent/HK26595A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0216327A2 (en) | 1987-04-01 |
| EP0216327A3 (en) | 1988-08-03 |
| HK26595A (en) | 1995-03-10 |
| DE3675310D1 (en) | 1990-12-06 |
| ATE57880T1 (en) | 1990-11-15 |
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