EP0915013B1 - Verfahren zum Deckelverschliessen von Behältern, Deckelfolie zum Durchführen dieses Verfahrens und so hergestelltes Produkt - Google Patents

Verfahren zum Deckelverschliessen von Behältern, Deckelfolie zum Durchführen dieses Verfahrens und so hergestelltes Produkt Download PDF

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EP0915013B1
EP0915013B1 EP98402767A EP98402767A EP0915013B1 EP 0915013 B1 EP0915013 B1 EP 0915013B1 EP 98402767 A EP98402767 A EP 98402767A EP 98402767 A EP98402767 A EP 98402767A EP 0915013 B1 EP0915013 B1 EP 0915013B1
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EP
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Prior art keywords
adhesive
sheet
film
films
container
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EP98402767A
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English (en)
French (fr)
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EP0915013A1 (de
Inventor
Christian André Luc Brodart
Michel Jean Roger Brodart
Didier Marie Charles René Richardot
Roderick Louis Charles Volrath
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Brodart SA
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Brodart SA
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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
    • 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
    • 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
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
    • 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
    • B65D2205/00—Venting means

Definitions

  • the container and its lid are sterilized at the same time as the food, by the cooking operation itself, which has the advantage of simplicity.
  • valves or valves, as simple as possible which ensure on the one hand the exit to the atmosphere of the gases under pressure inside the container itself, and secondly the return to a filling complete as soon as the internal pressure returns to normal.
  • Patent FR-A-2,629,060 proposes to provide trays with a real flapper antiretour movable between two positions respectively corresponding to the opening to the atmosphere of the interior of the tray and its hermetic closure.
  • bag for a product called "boil-in-the-bag", and which describes a container of the general type recalled above, stating that one of the faces of the bag is formed by a sheet having two films, one of which has holes that may or may not be facing channels rectilinear and parallel.
  • DE 0 160 978 discloses a sheet of synthetic material formed of two superimposed films. A joining adhesive is interposed in the form of a large number of small areas that are not in contact with each other. This sheet presents a static-type operation with unglued areas that remain open for allow "a gas exchange”.
  • US 4,884,694 discloses a sheet of synthetic material formed of two superimposed films, the upper film being made of paper and the lower film being thermoplastic material and provided with perforations. This sheet helps to guarantee the gas permeability required for gas sterilization, and in particular hot steam.
  • the present invention provides a novel solution to the problem of lidding containers to subject them to differences in temperature and pressure, while using simple, proven and economical manufacturing methods.
  • the subject of the invention is also a sheet of synthetic material as defined in the claim 11.
  • the invention also relates to an industrial product constituted by a container filled with a content, having a flange and closed by means of a seal which is sealed to the entire surface of the rim and which consists of a sheet of synthetic material conforming the above definition, with areas left free and constituting a network of several parallel channels having at least one outlet to the atmosphere by the edge, or one of the edges, of the closed container.
  • the process according to the invention is intended for the lidding of containers A of the known type comprising a body B and a flange continuous device C.
  • the container A is an oblong tray but it can be containers of other shapes, in particular pots whose body has a circular section and a frustoconical profile, the edge itself being circular.
  • Another example of operculum containers are pots having flat faces, connected by curves, and whose rim has a substantially square contour with rounded corners.
  • the lidding must, of course, be carried out after filling the container with a D content that will be supposed here to be a food.
  • the cover must be applied over the entire surface of the edge C and be attached to it by means of a adhesive.
  • This operculum consists of a sheet composed of two films respectively internal 1 and external 2.
  • the inner film 1 is previously perforated to be crossed by multiple small perforations or "microperforations" 3, in order to be permeable to gases.
  • the outer film 2 is continuous and waterproof.
  • Both films 1 and 2 must be assembled together, which can be at the same time that the inner film 1 is fixed on the flange C or previously, but anyway, this assembly must leave free areas, so that an adhesive inserted between them, called “junction”, must be present only on a part only from the surface of films 1 and 2.
  • the two films 1 and 2 are joined to each other only by the places where junction adhesive, to determine a network of channels that open up on the edges of the leaf, between the two films 1 and 2.
  • microperforations 3 we are certain that some of they will be in the channels, without the need for any tracking but also because of their high density, these microperforations present, together, a large section of total passage, while being distributed over all the surface of the film 1.
  • the atmosphere inside the tray A can communicate with external atmosphere, provided that it is brought to sufficient pressure to exclude films 1 and 2 of each other according to the channels determined by the absence of adhesive junction.
  • this sheet is cut, in particular by a cutting blade symbolized in E in FIG. 3, as close as possible to the contour of said flange C, in particular by leaving a tongue (not shown) facilitating its subsequent uprooting by the user, so that he can access content D.
  • the joining adhesive can, indifferently, itself be separate from the films 1 and 2, and be formed, in a manner known per se, of a web unwound from a reel (not shown), or be previously applied on the face of any of these films in front of to stand next to the other film.
  • the fixing of the sheet on the flange C can be achieved by any means known, in particular by means of a lidding adhesive, it can also be separate from film 1 and edge C, or may have been previously applied to one or the other.
  • FIG. 2 shows the case where the sheet 1 bears on its underside an adhesive 4 and on its upper side a bonding adhesive 5.
  • the method for producing sheet 1 then advantageously provides for the introduction of the adhesive 4 on the film 1 first, then the simultaneous perforation of the sheet 1 and the adhesive 4, then the fixing of the films 1 and 2 together by the bonding adhesive 5, the latter not necessarily perforated because it is discontinuous.
  • the joining adhesive 5 is arranged according to squares aligned and separated from each other by zones 6 and 7 without adhesive and disposed in two perpendicular directions and forming a relatively dense network.
  • the film 2 is then superimposed on the sheet 1 provided with the adhesive 4.
  • the two adhesives 4 and 5 may have the same physico-chemical characteristics, since the same single heating operation must have the same effects on both adhesives.
  • lidding adhesive 4 is applied in a continuous surface
  • bonding adhesive 5 is applied discontinuously.
  • the two films 1 and 2 are strictly applied one on the other and the D content is perfectly preserved from any contamination from the external atmosphere, because the outer film 2 is waterproof and continuous and because the inner film 1 is itself fixed to the flange C in a sealed and continuous manner.
  • zones 6 and 7 extend continuously to the edges of the film 1 as soon as the application of the bonding adhesive 5 and remain after cutting the entire sheet, both in the transverse direction (zones 6) and in the longitudinal direction (zones 7).
  • the user can remove the lid to access the content D, without fear a violent effect due to the internal overpressure, this being automatically eliminated by evacuation of gases through channels 8 and 9.
  • Figures 4 to 9 illustrate another embodiment of the method according to the invention. Indeed, here we proceed first to the complete development of the bicellar sheet, in associating the two films 1 and 2 by the joining adhesive 5, in order to obtain a set unit forming a complete industrial product, capable of being sold, delivered, stored and used until closed, without prior operation for the undertaking which carries out the filling container A and sealing it.
  • the lidding adhesive 4 may or may not be associated with the sheet thus produced, according to the respective characteristics of the rim C and the film 1.
  • this lidding adhesive 4 is effectively applied to the face outer of the sheet, that is to say the outer face of the film 1 opposite the film 2, so that the complete industrial product is immediately available for the lidding by gluing of the sheet on the rim C, independently of the material used to make container A.
  • FIGS. 4 and 7 show a coil 10 formed by the winding of numerous turns of a sheet comprising on the one hand the two films 1 and 2 and the joining adhesive 5 after activation so that the two films are fixed to one another, and secondly the lidding adhesive 4.
  • This sheet is unwound from the spool 10 and is applied stretched over a container A filled with its content D, then this set is placed next to a known mechanism in comprising on the one hand an upper punch 11, bearing a peripheral failure 12 of shapes and dimensions adapted to those of the edge C and comprising means for heating and secondly an anvil 13.
  • the container A is placed between the punch 11 and the anvil 13, which are then approached one another, in order to strongly pinch the sheet between the upper punch 11 and the flange C supported by the anvil 13, which has the effect of activating the lidding adhesive 4 and to cause the sheet to be attached to the rim C.
  • the sheet is cut as close as possible to the contour of the edge C, thanks to a cutting element 14 provided at the periphery of the fault 12.
  • the punch 11 and the anvil 13 are spaced apart (FIGS. 5 and 8) and the sealed container is evacuated to another position in the packaging line.
  • the activation of the lidding adhesive 4 intervenes while the joining adhesive 5 has already been activated since the two films 1 and 2 are fixed to each other.
  • the activation of the lidding adhesive 4 is done through the entire sheet, because that the fault 12 and the anvil 13 are located on either side of the rim C covered with the sheet, it is necessary to avoid that the heating due to the action of the failure 12 modifies the adhesive of junction 5 which is at the origin of the existence of the channels 8 and 9.
  • the two adhesives 4 and 5 have characteristics physicochemical, so that during sealing, the adhesive 4 is activated and that the junction adhesive 5, already used, remains intact.
  • two different adhesives can be chosen, the one intended for lidding being active at a temperature significantly lower than that of the bonding adhesive 5.
  • the joining adhesive 5 a material obtained by polycondensation
  • the lidding adhesive 4 is a material obtained by polymerization
  • the arrangement of the bonding adhesive 5 can be in a number of variants, such as examples are shown in Figures 10, 11, 14 and 16.
  • the sheet Since the sheet must fulfill its function of evacuating the internal gases under pressure, it is necessary to it can be applied "per kilometer" above the containers to be sealed in series, it is necessary and sufficient that the inner sheet 1 is crossed by multiple perforations and that the outer sheet 2 is adhered to the sheet 1 only partially, in order to obtain not a single isolated channel (and therefore to locate) but a network of several channels, or a network of several branches of a single channel.
  • FIGS. 10, 11, 14 and 16 show different dispositions of the zones 6-7 lack of bonding adhesive 5 on the film 1, the latter being crossed multiple pinholes. These microperforations are not shown in FIGS. 10, 11 and 14, only to keep them as clear as possible, but in reality these microperforations are necessarily present, as shown schematically in the figure 16.
  • film 1 has been given a circular shape, not that it constitutes a limit of the application of the invention to containers or pots having this section, but as representing any portion considered on a film 1.
  • the joining adhesive 5 leaves parallel straight regions 61 remaining, oriented longitudinally with respect to the film 1.
  • the channels resulting from the existence of the zones 61 open necessarily at the ends of the film 1 perpendicular to its axis, and perhaps on one or both edges parallel to this axis, if, as shown at 62 on the part right of Figure 10, the sheet is cut along the rim of the container, in line with one channels.
  • the zones 63 are still rectilinear and parallel, but oriented obliquely to the axis of the film 1.
  • zones 68 are arranged in parallel but have a wavy course and no longer rectilinear. They are represented as extending parallel to the axis of the film 1, but they could also be oblique.
  • channels 8 and 9 allow evacuation automatic gas and vapor pressure existing inside the container A sealed. When this pressure decreases or even disappears completely, the channels close again automatically thanks to the intrinsic elasticity of films 1 and 2 or, in any case, the top 2 film. When the internal pressure drops below the pressure Atmosphere of the atmosphere, the channels are even hermetically closed and oppose at any entrance of outside air towards the interior of the container, as a consequence of the depression which reigns in container A.
  • a first operation can be planned at the place of packaging for the sterilization of containers and their contents.
  • a second operation can take place at the user to warm the content, especially when it comes to food.
  • the sealing adhesive ensures that there will be no communication between the interior container A and outside, during various handling and storage.
  • It may be an adhesive sensitive to temperature and / or humidity.
  • a long-acting adhesive of the type applied to articles and sheets of paper repositionable which allows the two films 1 and 2 to move easily apart when the container A is subjected to heating and / or immersion and which, in any case, is in contact with the gases and vapors released by the content D, while reconstituting the collage of these films 1 and 2 when the internal pressure allows them to put back in touch. This effect is even more marked, and the watertightness is ensured, when the internal pressure becomes lower than the atmospheric pressure because the depression which in This results in true plating of the films 1 and 2 against each other.
  • the sealing adhesive may also be chosen to melt at a certain temperature. In this case, it must be chosen to be neutralized easily during the elevation of temperature from the sterilization and / or reheating of the content D, so that the exhaust channels for gases and vapors are quickly and largely released before the internal overpressure reaches a dangerous value for the integrity of the container.
  • the sealing adhesive has the advantage of compensating, if necessary, the small spacing and / or lack of adhesion of films 1 and 2, especially from tiny irregularities created during the formation of microperforations.
  • Microperforations can also be obtained with cold needles, but then acts in a way by tearing, which leaves minute irregularities but very visible under the microscope, having effects equivalent to those of the bead described above.
  • the density of the microperforations has been found to provide excellent results between 200 and 2000 perforations per square decimetre in some cases, and between 500 and 1,200 perforations per square decimetre in other cases.
  • current research lead to an increase in the density of perforations up to 10,000 perforations per square decimeter and miniaturization of the perforations, as this leads to an excellent distribution of the evacuation vents of gases and vapors under pressure.
  • this density must be coordinated with the nature of the content D, because a liquid content is homogeneous in the interior space of the container A and requires a density of perforations incomparably less than that of a foil capping a container containing a food preparation consisting of bulky solid parts, preventing a free flow of gases and vapors.
  • the microperforations must be numerous to be everywhere above the solid parts like liquid parts.
  • FIG. 16 is an almost full size view illustrating in a very schematic the appearance of a fraction of the film 1 according to the invention, being specified that in reality the film is transparent and microperforations virtually invisible because they correspond to the material removed.
  • the channels have a wavy course and are parallel, having outlets located only at the transverse ends of the sheet, and therefore of the container capped.
  • microperforations can be spaced from each other at equal distances in orthogonal directions, or on the contrary be separated from different distances.
  • the canals should be narrow and numerous than broad and rare, especially when the content is heterogeneous.
  • the density of the channels is advantageously between 5 and 15.
  • the invention provides for a very large number of perforations of very small diameter as well that a significant number of narrow channels, sealing the fixation of both film 1 and 2 to each other is crucial, as well as, of course, the sealing of the lidding of film 1 on the c-flange
  • the film 1 is formed of two layers 1a and 1b fixed to each other along their entire surface and of different but compatible composition.
  • One can then choose a composition of the lower layer 1 is coordinated with the composition of the constituent material of the rim C, while choosing the composition of the upper layer 1 b coordinated with that of the film 2.
  • the constituent material of the container A (and thus its rim C) is polypropylene, is chosen to constitute the lower layer 1a, cast polypropylene, that is to say of extruded polypropylene - calendered, non-oriented, then that the layer 1b is polyethylene terephthalate (“PET”), the film 2 is also PET.
  • PET polyethylene terephthalate
  • a film of polyethylene terephthalate thickness ⁇ is coated on one of its faces of a universal heat-sealing lacquer and constitutes the inner film 1.
  • This film is pierced with microperforations 3 using a microperforator cold needles, in a configuration where the microperforations are 5 mm apart in the direction of the sheet and 5 mm in the longitudinal direction, shifted by a distance of 2.5 mm per row to give a pattern in squares.
  • a film also made of polyethylene terephthalate but only 12 ⁇ thick constitutes the outer film 2.
  • a screen cylinder allowing the deposit of the glue comprises peripheral grooves of 2.5 mm width, equidistant from 5 mm.
  • the sheet thus “complexed” in width of 600 mm is used on a machine of packaging of the type known as "Fill Seal” for sealing trays crystallized polyethylene terephthalate (“CPET”), with a circular periphery of 95 mm diameter.
  • CPET crystallized polyethylene terephthalate
  • the equipment is used to seal two rows of trays over a width of 190 mm. Filling, sealing and cutting operations are performed on the machine.
  • the trays trays are placed in a steam oven where they undergo a temperature of 90 ° C for 35 minutes.
  • the packaged products are cooked properly and the container has not undergone any deformation.
  • the trays trays are placed in a traditional oven where they undergo a temperature of 150 ° C for 90 minutes.
  • the packaged products are cooked properly and the container has not undergone any deformation.
  • the sheet is formed by the same films, as in Example 1.
  • the screen cylinder which allows the deposition of glue has grooves in the "machine direction" (longitudinally with respect to the scrolling of the films) and in the cross direction, the grooves having a width of 2.5 mm and spaced 5 mm apart.
  • the sheet is formed by the same films, as in Examples 1 and 2.
  • screened cylinder which allows glue deposition has spiral grooves.
  • the sheet is formed by the same films, as in Examples 1, 2 and 3.
  • a screened cylinder which allows glue deposition has sinuous grooves.
  • the outer film 2 is full, that is to say, continuous and waterproof. It can be simple, as described, or formed of several assembled layers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closing Of Containers (AREA)
  • Packages (AREA)
  • Package Closures (AREA)

Claims (24)

  1. Verfahren zum Verschließen von Behältern wie etwa Töpfen, Bechern oder dergleichen mit Hilfe eines Dekkels, die ein Produkt enthalten sollen, das in dem Behälter selbst erwärmt werden soll, wobei gemäß dem Verfahren ein Behälter mit einem umgebogenen Rand hergestellt wird, der dann mit seinem Inhalt gefüllt wird, eine Kunststofffolie aus wenigstens zwei Schichten, von denen die eine von Löchern durchbohrt ist und die nur auf einem Bruchteil ihrer Oberfläche zusammengefügt sind, so dass zwischen ihnen wenigstens ein Kanal ausgebildet ist, auf dem Rand angeordnet wird, wobei die Folie über den gefüllten Behälter gespannt wird, diese Folie dann dicht auf dem umgebogenen Rand befestigt wird, und die Folie dann möglichst nahe bei der äußeren Kontur des umgebogenen Randes abgeschnitten wird, um so einen dicht verschlossenen Deckel zu bilden, dadurch gekennzeichnet, dass zuvor mit Hilfe von wenigstens zwei Filmen, einen sogenannten "inneren" (1) bzw. "äußeren" (2) dichten Film, eine Folie unbestimmter Länge hergestellt wird, und dass, in beliebiger Reihenfolge:
    der innere Film (1) mit einer Mehrzahl von kleinen Perforationen (3) mit einer Dichte zwischen 100 und 10000 Perforationen (3) pro Quadratdezimeter durchstochen wird,
    ein sogenanntes "Verbindungs"-Klebemittel (5) auf einer beliebigen der zwei gegenüberliegenden Oberflächen der Filme (1-2) geometrisch regelmäßig angeordnet wird,
    die zwei Filme (1 und 2) übereinander gelegt werden,
    diese zwei Filme (1 und 2) mit Hilfe des Verbindungsklebemittels (5), das sich zwischen den zwei Filmen (1 und 2) befindet und auf nur einem Teil der Oberfläche der Filme angeordnet ist, zusammengefügt werden, so dass deutlich abgegrenzte, durchgängige, geometrische Zonen (6-7) ohne Verbindungsklebemittel (5) bestehen bleiben, die ein Netz aus mehreren parallelen Kanälen bilden, deren Öffnung sich auf wenigstens einem Rand der Folie befindet, wobei der Rand, wenn er der einzige ist, entweder der Längsrand vor dem Abschneiden der Folie oder der Querrand nach dem Abschneiden ist, wobei die Kanäle dazu geeignet sind, sich unter der Wirkung der Drucks automatisch zu öffnen und wieder zu verschließen, um ein Entweichen von Gasen zu ermöglichen, diese über den gefüllten Behälter (A) gespannte Folie angebracht wird, indem der innere Film (1) und der umgebogene Rand (C) unter Zwischenfügung eines durchgehenden Deckelverschlussklebemittels (4) in Kontakt gebracht werden, und
    die Folie an dem umgebogenen Rand (C) befestigt wird, indem das Deckelverschlussklebemittel (4) durch Mittel über den äußeren Film (2) aktiviert wird, die nur auf den inneren Film wirken, so dass der Durchlass jedes Kanals selbst nach der Befestigung auf dem Rand (C) und nach dem Abschneiden freigelassen wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das durchgehende Deckelverschlussklebemittel (4) auf dem inneren Film (1) angeordnet wird, bevor dieser durchstochen wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die zwei Filme (1 und 2) zusammengefügt werden, bevor man mit der Befestigung der Folie fortfährt, die daraufhin auf dem umgebogenen Rand (C) eines Behälters (A) erfolgt, um so eine einheitliche Ganzheit zu bilden, die dazu geeignet ist, insbesondere als Rolle (10) gelagert und in diesem Zustand zum Zwecke eines späteren Deckeverschlusses bereitgestellt zu werden.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die zwei Filme (1 und 2), von denen der eine das Verbindungsklebemittel (5) trägt, übereinander gelegt werden, dass diese zwei übereinander gelegten Filme (1 und 2) über dem gefüllten Behälter (A) angeordnet werden und dass das Verbindungsklebemittel (5) und das Deckelverschlussklebemittel (4) gleichzeitig aktiviert werden, um zeitgleich das Zusammenfügen der zwei Filme (1 und 2) untereinander und die dichte Befestigung der gesamten Folie auf dem umgebogenen Rand (C) zu erreichen.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Deckelverschlussklebemittel (4) einen Schmelzpunkt besitzt, der deutlich unterhalb desjenigen des Verbindungsklebemittels (5) liegt.
  6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass sich die Art des Verbindungsklebemittels (5) von der des Deckelverschlussklebemittele (4) unterscheidet, um gegenüber dem Anbringen von diesem unempfindlich zu sein.
  7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das verbindungsklebemittel (5) durch Polykondensation gewonnen wird, während das Deckelverschlussklebemittel (4) durch Polymerisation gewonnen wird.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass auf wenigstens einen der Filme (1 und 2) in wenigstens bestimmte der parallelen Kanäle (6, 7, 61, 63, 64-65, 66-67, 68, 69) ein Dichtungsklebemittel appliziert wird, dessen Wirkung sich bei einer Temperatur, die höher als die Umgebungstemperatur und niedriger als die Temperatur ist, auf die der Inhalt erwärmt werden muss, aufhebt.
  9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der perforierte Film (1) mit Hilfe von zwei Schichten (1a und 1b) gebildet wird, die mit ihren gesamten gegenüberliegenden Oberflächen zusammengeklebt werden, wobei diejenige (1a), die sich in Kontakt mit dem umgebogenen Rand (C) des Behälters (A) befinden soll, eine Zusammensetzung aufweist, die sie besonders geeignet für ihre dichte Befestigung an dem umgebogenen Rand (C) macht, während diejenige (1b), die sich in Kontakt mit dem dichten Film (2) befinden soll, eine Zusammensetzung aufweist, die sie besonders geeignet für ihre Befestigung an dem dichten Film (2) mit Hilfe des Verbindungsklebemittels (5) macht.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass der umgebogene Rand (C) des Behälters (A) aus Polypropylen ist, die Schicht (1a), die sich in Kontakt mit ihm befinden soll, aus gespritztem Propylen ist, während die Schicht (1b), die auf der vorherigen (1a) befestigt ist, aus Polyethylen-Terephthalat ist, ebenso wie der dichte Film (2).
  11. Kunststofffolie zum Verschließen von Behältern (A) wie etwa Töpfen, Bechern und dergleichen, welche einen umgebogenen Rand (C) aufweisen, mit Hilfe eines Deckels, die aus zwei übereinander liegenden Filmen (1 und 2) gebildet ist, wobei der eine (1) der Filme (1-2) eine Mehrzahl von kleinen Perforationen (3) mit einer Dichte von zwischen 100 und 10000 Perforationen (3) pro Quadratdezimeter aufweist und der andere (2) dicht ist, dadurch gekennzeichnet, dass ein sogenanntes "Verbindungs"-Klebemittel (5) geometrisch regelmäßig zwischen den zwei Filmen (1 und 2) auf nur einem Teil ihrer Oberfläche angeordnet ist und deutlich abgegrenzte, durchgehende geometrische Zonen (6, 7, 61, 63, 64-65, 66-67, 68, 69) ohne Verbindungsklebemittel (5) übrig lässt, die ein Netz aus mehreren parallelen Kanälen (6, 7, 61, 63, 64-65, 66-67, 68, 69) bilden, deren Öffnung sich entweder auf wenigstens einem der zwei Längsränder der Filme (1 und 2) oder an wenigstens einem ihrer Querenden befindet, wobei die Kanäle dazu geeignet sind, sich unter der Wirkung des Drucks automatisch zu öffnen und wieder zu verschließen, um das Entweichen der Gase zu ermöglichen.
  12. Folie nach Anspruch 11, dadurch gekennzeichnet, dass die Dichte der Perforationen (3) zwischen 200 und 2000 Perforationen (3) pro Quadratdezimeter liegt.
  13. Folie nach Anspruch 12, dadurch gekennzeichnet, dass die Dichte der Perforationen (3) zwischen 500 und 1200 Perforationen (3) pro Quadratdezimeter liegt.
  14. Folie nach Anspruch 11, dadurch gekennzeichnet, dass der Abstand, der zwei Perforationen (3) trennt, in zwei orthogonalen Richtungen der Ebene der gleiche ist.
  15. Folie nach Anspruch 11, dadurch gekennzeichnet, dass der Abstand, der zwei Perforationen (3) trennt, in zwei orthogonalen Richtungen der Ebene unterschiedlich ist.
  16. Folie nach Anspruch 11, dadurch gekennzeichnet, dass die Breite jedes parallelen Kanals (6, 7, 61, 63, 64-65, 66-67, 68, 69) zwischen 2 und 5 Millimeter beträgt.
  17. Folie nach Anspruch 16, dadurch gekennzeichnet, dass die Breite jedes der parallelen Kanäle (6, 7, 61, 63, 64-65, 66-67, 68, 69) zwischen 3 und 3,5 Millimeter beträgt.
  18. Folie nach Anspruch 11, dadurch gekennzeichnet, dass die Anzahl der parallelen Kanäle (6, 7, 61, 63, 64-65, 66-67, 68, 69) zwischen 5 und 15 pro Dezimeter ist.
  19. Folie nach Anspruch 11, dadurch gekennzeichnet, dass wenigstens bestimmte der parallelen Kanäle (6, 7, 61, 63, 64-65, 66-67, 68, 69) ein Dichtungsklebemittel enthalten.
  20. Folie nach Anspruch 11, dadurch gekennzeichnet, dass der perforierte Film (1) zweischichtig ist, d.h. durch vollflächiges Zusammenkleben von zwei Schichten (1a und 1b) gebildet ist.
  21. Folie nach Anspruch 11, dadurch gekennzeichnet, dass die zwei Filme (1 und 2) durch das Verbindungsklebemittel (5) zusammengefügt sind, um eine einheitliche Ganzheit zu bilden, die dazu geeignet ist, insbesondere als Rolle (10) gelagert und in diesem Zustand zum Zwecke eines späteren Deckeverschlusses bereitgestellt zu werden.
  22. Folie nach Anspruch 11, dadurch gekennzeichnet, dass der Film (1), der eine Mehrzahl von kleinen Perforationen (3) aufweist, auf seiner äußeren Oberfläche, d.h. auf seiner Oberfläche, die dem anderen Film (2) gegenüberliegt, ein durchgehendes Klebemittel (4) zu tragen.
  23. Folie nach Anspruch 10, dadurch gekennzeichnet, dass der Film (1), der ein durchgehendes Klebemittel (4) trägt, und der weitere Film (2) durch das Verbindungsklebemittel (5) zusammengefügt sind, um einen einheitlichen Aufbau zu bilden, der dazu geeignet ist, insbesondere als Rolle (10) gelagert und in diesem Zustand zum Zwecke eines späteren Deckeverschlusses bereitgestellt zu werden.
  24. Industrieprodukt, das durch einen Behälter (A) gebildet ist, der mit einem Inhalt (D) gefüllt ist, der einen umgebogenen Rand (C) aufweist und mit Hilfe eines Deckels verschlossen ist, der auf der gesamten Oberfläche des umgebogenen Randes (C) dicht verschlossen ist und der aus einer Kunststofffolie gemäß Anspruch 11 gebildet ist, die Zonen (6, 7, 61, 63, 64-65, 66-67, 68, 69) aufweist, die frei gelassen sind und ein Netz von mehreren parallelen Kanälen bilden, die wenigstens eine Öffnung zur Atmosphäre durch den Rand oder den einen der Ränder des verschlossenen Behälters (A) aufweisen.
EP98402767A 1997-11-07 1998-11-06 Verfahren zum Deckelverschliessen von Behältern, Deckelfolie zum Durchführen dieses Verfahrens und so hergestelltes Produkt Expired - Lifetime EP0915013B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9714016 1997-11-07
FR9714016 1997-11-07

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EP0915013A1 EP0915013A1 (de) 1999-05-12
EP0915013B1 true EP0915013B1 (de) 2005-12-14

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AT (1) ATE312757T1 (de)
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Publication number Priority date Publication date Assignee Title
NL1016978C2 (nl) * 2000-12-22 2002-06-25 Robert Jan Colenbrander Inrichting en werkwijze voor het verpakken en bereiden van voedsel en werkwijze voor het vervaardigen van een dergelijke inrichting.
GB2367527B (en) * 2001-07-23 2002-09-11 Abdul Aziz Okhai Packaging film
EP1422163A1 (de) * 2002-11-22 2004-05-26 Amcor Flexibles Europe A/S Lebensmittelverpackung zur Erwärmung in einem Ofen
ES2221563B2 (es) * 2003-05-08 2006-01-01 Agroinnova, S.L. Procedimiento de preparacion y envasado de un producto alimenticio fresco para su conservacion y posterior coccion al vapor, y envase correspondiente.
EP3575084A1 (de) * 2018-06-01 2019-12-04 Amcor Europe Group Management Filmstreifen zur abdichtung von schalen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870954A (en) 1956-05-15 1959-01-27 Reynolds Metals Co Vacuum package
US3435948A (en) * 1966-08-08 1969-04-01 Ethicon Inc Gas sterilizable package
DE2331862A1 (de) 1973-06-22 1975-01-16 Hesser Ag Maschf Ventil zur begrenzung des innendrucks in zur aufnahme von gas abgebenden guetern bestimmten verpackungsbehaeltern sowie verfahren zum herstellen des ventils
DE3416752A1 (de) * 1984-05-07 1985-11-07 Nyffeler, Corti AG, Kirchberg Verschlussmembran fuer behaelter mit gas-entwickelndem fuellgut
DE3521373A1 (de) 1985-06-14 1986-12-18 Heinrich Hermann Gmbh + Co, 7000 Stuttgart Ueberdruckventil fuer einen verpackungsbehaelter, insbesondere aus flexiblem werkstoff und dessen herstellungsverfahren
DE3623568A1 (de) * 1985-08-27 1987-03-12 Sengewald Karl H Gassterilisierbare verpackung
FR2629060A1 (fr) 1988-03-28 1989-09-29 Cook In Pack Sa Dispositif d'obturation automatique par effet thermique de conditionnement pour preparations alimentaires a consommations differees
GB2251420A (en) * 1990-12-12 1992-07-08 Courtaulds Packaging Ltd Package in which foodstuff may be heated and/or cooked
EP0531176A1 (de) 1991-09-06 1993-03-10 Unilever Plc Verpackungsmaterial

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DK0915013T3 (da) 2006-05-01
DE69832771D1 (de) 2006-01-19
EP0915013A1 (de) 1999-05-12

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