EP1798160B1 - Verpackung für Lebensmittel, die Flüssigkeit abgeben, mittels Vakuum oder Schutzatmosphäre - Google Patents

Verpackung für Lebensmittel, die Flüssigkeit abgeben, mittels Vakuum oder Schutzatmosphäre Download PDF

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Publication number
EP1798160B1
EP1798160B1 EP05425887A EP05425887A EP1798160B1 EP 1798160 B1 EP1798160 B1 EP 1798160B1 EP 05425887 A EP05425887 A EP 05425887A EP 05425887 A EP05425887 A EP 05425887A EP 1798160 B1 EP1798160 B1 EP 1798160B1
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EP
European Patent Office
Prior art keywords
tray
foil
plastic material
gas
film
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.)
Not-in-force
Application number
EP05425887A
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English (en)
French (fr)
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EP1798160A1 (de
Inventor
Luigi Garavaglia
Mauro Bonvini
Fausto Fontana
Sara Delfini
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SIRAP GEMA SpA
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SIRAP GEMA SpA
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Filing date
Publication date
Priority to EP05425887A priority Critical patent/EP1798160B1/de
Application filed by SIRAP GEMA SpA filed Critical SIRAP GEMA SpA
Priority to ES05425887T priority patent/ES2340775T3/es
Priority to PL05425887T priority patent/PL1798160T3/pl
Priority to DK05425887.6T priority patent/DK1798160T3/da
Priority to DE602005019433T priority patent/DE602005019433D1/de
Priority to AT05425887T priority patent/ATE457938T1/de
Priority to PT05425887T priority patent/PT1798160E/pt
Priority to SI200530985T priority patent/SI1798160T1/sl
Publication of EP1798160A1 publication Critical patent/EP1798160A1/de
Application granted granted Critical
Publication of EP1798160B1 publication Critical patent/EP1798160B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • B65D81/264—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing liquids
    • 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
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the 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
    • 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
    • B65D81/2015—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 an at least partially rigid 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
    • 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
    • B65D81/2069—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 in a special atmosphere
    • B65D81/2076—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 in a special atmosphere in an at least partially rigid container

Definitions

  • the present invention relates to the field of modified atmosphere packaging or vacuum packaging of food products by means of packages made of plastic material.
  • the invention relates to a package for food products comprising a tray made of plastic material, having barrier properties with respect to the gases diffusion and having absorbing power with respect to any fluid released by the food products, and a hermetically sealed cover on said container.
  • the present invention also relates to a tray to be used in the aforesaid package and a process for the preparation of such a tray and such a package.
  • tray is used herein to mean any container, which may have a shape other than that of an ordinary tray while still including a bottom and side walls ending in an edge.
  • fluid is used herein to mean any liquids (exudates) released by a food product during preservation and/or any gas contained in said package.
  • a currently very diffused technique provides the use of a tray made of expanded plastic material which is rendered gas-impermeable through the coupling of a film provided with gas-barrier properties onto the inner face of the tray. Before sealing it with a cover of gas-barrier film, the replacement of the air inside the package with a suitable gas mixture is carried out.
  • an absorbing pad can be used between the food product and the bottom of the tray, which, however negatively influences the production costs, complicates the operations of disposal and recycle of the packages after use, and can contribute to the microbiological proliferation.
  • Patent Application WO 00/46125 describes a tray having absorbing properties which is suitable for vacuum packaging or modified atmosphere packaging of food products which may release liquids.
  • a tray consists of a structure made of open-cells plastic material enclosed between two films of which at least one is impermeable to the gases respectively applied onto its inner and outer surface.
  • the film applied onto the inner surface is interrupted by perforations in order to allow the liquid to penetrate into a predetermined portion of the underlying open-cells structure.
  • said portion is sealed by welding the two films in predetermined points in order to prevent the liquid provided inside it from migrating into the remaining open-cells structure of the tray.
  • the technical problem at the basis of the present invention is that of providing a package for modified atmosphere packaging or vacuum packaging of food products susceptible of releasing liquids which is efficient in absorbing the fluids released by the food products and which allows to maintain the gas atmosphere set inside it or the vacuum before use substantially unaltered.
  • plastic material having fluid absorbing properties or its short form “absorbent plastic material” is used here to mean any plastic material having a porous or fibrous or expanded cellular structure with cells being at least partially open, preferably substantially or mostly open cells capable of taking in, as by absorption and/or draining out fluids, in particular liquids (exudates), released by the food products while stored in the package.
  • the absorbent plastic material is selected from the group including expanded thermoplastic materials, specifically polystyrene, polypropylene, polyethylene, woven or non-woven fibers, fluffed plastics, and polymers of a renovable nature such as biodegradable polymers.
  • polar component is used herein to mean any polymer or additive exhibiting an adequately polar behavior and polar content (e.g. molecular dipoles), and a high dielectric loss factor (generally higher than 0.2 at a frequency of 27.12 MHz), such that it can be heated by application of radio-frequencies.
  • said polar component is preferably selected from the group including ethylene vinyl alcohol (EVOH), ethylene vinyl acetate (EVA), EVA and EVOH polymers and copolymers, surfactants, ethylene metacrylate (EMA), ethylene butacrylate (EBA), and ethylene ethyl acrylate (EEA).
  • EVOH ethylene vinyl alcohol
  • EVA ethylene vinyl acetate
  • EVA ethylene vinyl acetate
  • EVA EVOH polymers and copolymers
  • surfactants ethylene metacrylate (EMA), ethylene butacrylate (EBA), and ethylene ethyl acrylate (EEA).
  • the thickness of said thin layer is 100 to 1500 microns, preferably 300 to 600 microns.
  • the perimetric portion of said tray wherein the sealing is carried out through the application of pressure and radio-frequency is at least a portion of the edge, preferably the whole edge, or a portion of the side walls.
  • thermoplastic materials having polar characteristics such as PVC (polyvinylchloride), EVA (ethylene vinyl acetate), APET (polyethylene terephtalate), and PUR (polyurethane).
  • Radio-frequency (RF) sealing also called high-frequency sealing or dielectric sealing
  • RF sealing is carried out by applying an electric field to polar thermoplastic materials such that the molecules (molecular dipoles) of these materials are forced to align themselves to the field potential. Fluctuation of the electrostatic field causes the molecules to vibrate and become heated by mutual friction.
  • the polar plastics materials are placed between two planes that function as capacitors and are subjected to the electric field, oscillating at a frequency of 27.12 MHz (as defined by the International Telecommunications Union (ITU) standard). The layers are fused and sealed together by pressing them between the planes.
  • ITU International Telecommunications Union
  • Non-polar polymers that do not respond to RF are, in fact, polypropylene, polyethylene and polystyrene, whose dielectric loss factor (or dielectric dissipation factor) is lower than 0.2 at 27 MHz, and may be lower than 0.01 in certain cases.
  • RF sealing is carried out to seal layers of the food product trays which comprise a substantial layer of a non-polar polymer unaffected by RF, as the layer of absorbent plastics material usually is, this being achieved by incorporating at least one polar component into the tray structure.
  • radio-frequency sealing can be applied to such a structure, but also, that in the sealing portion the fusion and the compaction of the layers constituting the tray can be obtained with substantial collapse of the absorbent structure until a thin layer is formed, the thin layer advantageously having efficient gas barrier properties and an adequate mechanical resistance.
  • at least one continuous intermediate region has been recognized in said thin layer defining the sealing portion, such a region being made of a compact material acting as an effective barrier to gases or .
  • said thin layer being completely made of a substantially compact gas-barrier material.
  • any uncollapsed portion of the absorbent structure has shown to have gas-barrier properties.
  • the tray of the package of the invention includes an additional layer, overlying said inward-facing layer, which is a film or foil of unexpanded plastics material having through holes or slots at least in correspondence with the bottom of the tray.
  • the unexpanded film or foil may be composite (multi-layer) or non-composite (single-layer).
  • a composite film of plastic material having gas-barrier properties may be used instead of the unexpanded film or foil of plastic material.
  • said unexpanded film or foil or said composite gas-barrier film is made opaque to allow the abosorbed liquid masking.
  • the opacifying may be achieved by incorporating titanium dioxide into the plastics material.
  • the film or foil of unexpanded plastics material is selected from a group including polystyrene, polypropylene, polyethylene (PE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), EVA, EVA polymers and copolymers, metallocenes, and combinations thereof, in particular a mixture of polyethylene and an EVA copolymer.
  • a composite film or composite foil comprising a layer of unexpanded polystyrene and a layer of a mixture of polyethylene and an EVA copolymer is especially preferred.
  • the gas-barrier films forming the outward facing layer in the tray, the optional layer overlying the inward-facing layer, and the cover are each preferably a multi-layer film comprising at least one gas-barrier layer of plastic material, a thermoplastic material layer, and a sealing outer layer.
  • additional layers could be provided for the purpose of conferring the desired mechanical and thickness characteristics on the film.
  • the material forming the gas-barrier layer may be selected from a group including polymers and copolymers of ethylene vinyl alcohol (EVOH), Nylon, polyvinylidene chloride (PVDC), poly- or copolyamides, and combinations thereof.
  • EVOH ethylene vinyl alcohol
  • Nylon Nylon
  • PVDC polyvinylidene chloride
  • poly- or copolyamides poly- or copolyamides
  • said material is a polymer or copolymer of ethylene vinyl alcohol and/or Nylon.
  • the material forming the sealing outer layer of the gas-barrier film is selected from a group including polyethylene (PE) and/or copolymers thereof, in particular ethylene vinyl acetate (EVA), polypropylene (PP) and copolymers thereof.
  • PE polyethylene
  • EVA ethylene vinyl acetate
  • PP polypropylene
  • Multi-layer films manufactured and sold by B-PACK being 50-60 micron thick and incorporating an EVOH gas-barrier layer, a polystyrene (PS) layer, and a sealing outer layer of polyethylene (PE), exemplify multi-layer gas-barrier films that are most preferred.
  • PS polystyrene
  • PE polyethylene
  • multi-layer gas-barrier films being particularly preferred are the multi-layer barrier films LID Cryovac, which are 25-micron thick and include an EVOH barrier layer as well as additional layers comprising polyethylene mixtures of varying densities and copolimers thereof.
  • an expanded polystyrene foil with substantially open cells is most preferred for the absorbent plastic material.
  • the basic weight of the polystyrene foil with substantially open cells is within the range of 150 to 450 g/m 2 .
  • At least one surfactant is incorporated to said polystyrene foil with substantially open cells. This can be done conventionally in the process of making said foil.
  • the surfactant allows the capability to absorb acqueous liquids by the open-cells thermoplastic material foil. It is by itself a polar additive that contributes to the conversion of the RF energy into heat, thereby aiding the fusion of the open-cells thermoplastic material, and through conduction, to the fusion of the materials of the other layers of the trays and possibly of the cover material as well, which are all involved in the RF sealing of the invention.
  • the surfactant may be selected among conventional anionic, cationic and non-ionic surfactants, and is preferably a salt of a sulphonic acid having formula R-SO 3 H or a sulphuric ester having formula R-OSO 3 H, where R is selected from a group including alkyl and arylalkyl with an alkaline metal or an alkaline-earth metal.
  • a specially preferred surfactant for use with the invention is an aliphatic sulphonate sold by NOVACROME under the trademark HOSTASTAT SYSTEM E 3904®.
  • the tray includes an additional layer made of an unexpanded plastic material foil and/or an expanded closed-cells plastic material foil, said additional layer extending between said inward-facing layer formed of an absorbent plastic material foil and said outward-facing layer formed of a gas-barrier film.
  • the unexpanded plastic material of said additional layer is polystyrene and/or HIPS (High Impact PolyStyrene) or a butadiene styrene copolimer, the expanded closed-cell plastics material being preferably polystyrene.
  • the package according to this invention has an advantage in that it will retain over time the atmosphere originally established inside it, since gases are prevented from diffusing outside , and it allows to preserve highly perishable food articles, e.g. based on beef, pork, chicken and fish meat, for several days without any appreciable losing y of their organoleptic and microbiological properties, and this while absorbing and hiding the exudate from view.
  • the gas-barrier structure of the thin layer including at least one region of compacted material, preferably interposed between two films of which at least one is a gas barrier formed along the perimetric portion of the RF-sealed package.
  • the gas-barrier film constituting the cover applied to the tray edge or RF sealed to said edge allows the package to be closed tight, thus preventing any gaseous exchange with the outside environment.
  • air can be removed from, the tray interior by virtue of the absorbent material porous nature , for example of the open cell structure of the expanded plastic material layer, and possibly replaced with the gaseous atmosphere of desired composition selected to suit the particular food article being packaged.
  • the absorption of the liquids released by the food products is not carried out by interposing a cellulose insert between the product and the tray bottom, but by exploiting the properties of the absorbent plastics material layer, e.g. open-cells expanded polystyrene containing a surfactant.
  • the upper surface of the open-cell expanded thermoplastic material foil being perforated throughout, effectively provides for the liquids to be absorbed away, even when the tray is put at an inclination angle.
  • Preferred methods for making a tray according to this invention are set forth in Claims 24 to 33.
  • Preferred methods for making a package according to this invention are set forth in Claims 34 to 37.
  • thermoplastic materials Ways of providing foils or sheets of absorbent thermoplastic materials are known from the relevant technical literature.
  • open cell expanded thermoplastic materials refer to Klempner and Frisch “Handbook of Polymeric Foams and Foam Technology", Carl Hanser Verlag, 1991 .
  • Specific methods are disclosed in EP-A-0 090 507 , US-A-3 610 509 , EP-A-0 642 907 and EP 0 849 309 , for example.
  • the bonding of the foil of absorbent thermoplastic material to the gas-barrier composite film (optionally with a foil of unexpanded material therebetween) and to the unexpanded foil may be carried out through heat-lamination, the use of adhesives or any another conventional method.
  • the bonding through heat-lamination is preferred.
  • the foil of open-cells thermoplastic material obtained by ordinary annular or flat head extrusion techniques, with expanding gases injected may initially have been heat-laminated to an unexpanded film or foil obtained by coextrusion or post-extrusion through a technique known as "extrusion coating", to provide a first composite sheet.
  • This first composite sheet is perforated on one side and laminated on the other side, either in-line or off-line, with a composite gas-barrier film to produce a second perforated composite sheet.
  • This latter lamination is preferably carried out at a temperature in the range of 185°-210°C, whilst the open-cell thermoplastic material foil is laminated with an unexpanded film or foil at a preferred temperature of 160-180°C.
  • said first perforated composite sheet may be laminated, on its non-perforated side, with a foil of an unexpanded composite material such as polystyrene, and the resulting laminate be subjected to successive lamination with a composite gas-barrier film over the free surface of the unexpanded material foil, thereby obtaining a third perforated composite sheet.
  • a foil of an unexpanded composite material such as polystyrene
  • the perforations or slots in the unexpanded film or foil and the open-cell thermoplastic material foil may be formed conventionally by means of perforating machines, for example. They are useful to allow the liquid released by the food product contained in the tray to pass into the foil of open-cell thermoplastic material.
  • the tray is molded conventionally, preferably through thermoforming of the second perforated composite sheet or the third perforated composite sheet in a specially provided die at a temperature in the range of 160°-220°C.
  • thermoforming operations may be carried out sequentially in one die or several dies with conventional methods, e.g. by vacuuming, injecting compressed air, mechanical methods, etc.
  • the tray is sealed along a perimetric portion thereof, preferably an edge portion or the whole edge or a portion of the sidewalls by applying pressure and radio-frequency.
  • the tray is first housed in a cavity of a suitable mould, then pressed against the portion to be sealed while in contact with a suitably shaped electrode which has been pre-heated at an appropriate temperature for sealing, and then exposed to RF energy.
  • the right combination of electric field application time, energy and pressure will set the polar components (polymers and/or additives) into vibration, to generate and propagate heat through the thickness of the perimetric sealing portion of the tray, thus inducing fusion of the layers and substantial collapse of the absorbent structure of the thermoplastic material foil (e.g. an open-cells thermoplastic material) into a thin layer comprised of an essentially compact material or provided with at least a definite region of essentially compact material.
  • the thermoplastic material foil e.g. an open-cells thermoplastic material
  • frequencies within the range of 1 to 300 MHz, preferably of 27,12 MHz, are applied for about 0.5-2 seconds, and the pressure applied to the sealed portion is of 10 to 1000 kg/cm 2 , with the electrode being pre-heated at a temperature in the range of 30° to 90°C.
  • the package may be made by using known processes in the art, e.g. from US Patent No. 5,744,181 .
  • a food product to be packaged is laid on the tray bottom after the RF sealing step, and the tray is sealed under a vacuum or protective atmosphere. Thereafter, a film of a gas-barrier-forming plastic material composite is bonded to the tray edge, preferably heat-sealed thereto.
  • the RF sealing step may also affect the barrier film from which the tray cover is formed, the sealing being here carried out as part of the package-making process. In this way, production costs can be appreciably reduced and the package according to the invention completed in less time.
  • a food product to be packaged is laid onto the tray bottom before of the perimetric RF sealing step, and the tray is sealed perimetrically at the edge, under a vacuum or a protective atmosphere, with a gas-barrier film constituting the cover by a radio-frequency process.
  • the package of the invention may be a vacuum or a modified-atmosphere package.
  • the modified atmosphere is achieved by vacuumizing, followed by an injection of inert gases such as nitrogen and carbon dioxide, or of oxygen-containing mixtures, as required for the type of food product that is being packaged for long-term preservation.
  • a package according to the invention is shown to include a tray 1 and a covering 2.
  • the tray 1 has a bottom 3 adapted to receive a food product 4 beforepackaging , and has sidewalls 5 ending in a jutting edge 6, the edge 6 having an end surface 6a.
  • the tray structure comprises a foil 7 of expanded polystyrene with substantially open cells, whose upper surface is covered with an unexpanded multi-layer film 8 (comprising a polystyrene layer and a sealing layer consisting of a mixture of polyethylene and an EVA copolymer) and whose lower surface is covered with a multi-layer film 9 incorporating a gas-barrier layer 9 of EVOH or Nylon.
  • an unexpanded multi-layer film 8 comprising a polystyrene layer and a sealing layer consisting of a mixture of polyethylene and an EVA copolymer
  • a multi-layer film 9 incorporating a gas-barrier layer 9 of EVOH or Nylon.
  • the film 8 is formed with a plurality of holes 10 having a predetermined diameter and reaching down to a predetermined depth in the thickness of the underlying expanded polystyrene foil 7, thereby to allow liquid matter released from the food product, in this case beef, pork, chicken cuttings, to enter into the substantially open cells of the foil 7 via said holes 10.
  • the open cells structure of the foil 7 has a thick network of canalized capillary ducts which intercommunicate the individual cells and allow the latter to receive and hold the liquid entered through said holes 10.
  • the liquid is trapped in a sponge-like fashion, and by virtue of the strong capillary effect of the canalizations on the liquid, the liquid is prevented from flowing back to the upper surface of the bottom 3 of the tray 1 through the holes 10, even when the tray is tilted or turned over.
  • the package is sealed perimetrically by an application of radio-frequency and pressure all around the edge 6 of the tray 1 before the covering 2 is attached. Therefore, the edge 6 will be in the form of a thin gas-barrier layer 11 having at least one region with a substantially compacted structure that extends all around the edge perimeter, the compact structure being the result of the materials of the foil 7 and the upper and lower films 8, 9 becoming fused under the heat generated by the vibratory motion of the molecules of the polar components exposed to the radio-frequency.
  • the cover 2 consists of a multi-layer barrier film, and is bonded to the tray by heat-sealing it to form a permanent bond to the material of the edge 6 of the tray 1.
  • This cover 2 is installed at the end of the packaging process, after a vacuum is drawn and/or the atmosphere inside the tray 1 containing the food product 4 is modified.
  • FIGS. 4 to 10 show further embodiments of the package according to the invention. Throughout these Figures, structural elements common or being functionally equivalent to elements of the package shown in Figures 1-3 carry the same reference numerals.
  • the package of the invention shown in Figures 4 and 5 differs from that shown in Figures 1-3 in that the tray 1 additionally includes a foil 7a of a closed-cells expanded plastic material, preferably polystyrene, disposed between the open-cell polystyrene foil 7 and the gas-barrier film 9.
  • the edge 6 is in the form of a thin gas-barrier layer 12, wherein at least one region having a substantially compact structure extends all around the edge perimeter, this compact structure originating from the fusion of the materials that comprise the open-cells polystyrene foil 7, closed-cells expanded plastic foil 7a, and upper and lower films 8 and 9, under the heat generated by vibration of molecules in the polar components exposed to radio-frequency.
  • the package partially shown in Figure 6 differs from that shown in Figures 1-3 in that the radio-frequency sealing is performed along a perimeter portion 13 of the side walls 5 of tray 1.
  • a thin gas-barrier layer 14 which includes at least one perimetric region having a substantially compact structure, this compact structure resulting from the fusion of the materials comprising the foil 7 and upper and lower films 8 and 9 induced by the heat generated by molecular vibration in the polar components exposed to radio-frequency.
  • Both packages partially shown in Figures 7 and 8 differ from that shown in Figures 1-3 in that the radio-frequency sealing is performed along a perimetric portion of the of the tray edge 6 rather than all around the entire edge 6.
  • RF sealing is performed perimetrically at an inner end portion of the edge 6 to form a thin gas-barrier layer 15
  • the sealing is performed perimetrically along a substantially central portion of the edge 6 to form a thin gas-barrier layer 16.
  • the barrier film constituting the cover 2 bonded to the tray 1 by heat sealing is permanently bonded to the edge 6 in the correspondence with the upper film 8 of the tray, and optionally along the sealing portions as well (as shown in Figures 7 and 8 ).
  • the package partially shown in Figure 9 differs from that shown in Figures 1-3 in that the radio-frequency sealing performed along the edge 6 of tray 1 also affects a perimetric portion of the gas-barrier film constituting the cover 2.
  • the edge 6 is a thin gas-barrier layer 18 which has at least one region with a substantially compact structure, this compact structure resulting from the fusion of the materials constituting the tray 1 (open-cell polystyrene foil 7, and upper and lower films 8 and 9), and of the barrier film constituting the cover 2, under the heat generated by the vibratory motion of the molecules of the polar components exposed to radio-frequency.
  • the package of this invention has an advantage in that the liquid realized from the food products can be absorbed across the entire inner surface of the tray, by virtue of the latter featuring a structure wherein an intermediate absorbent layer comprises preferably a foil of a thermoplastic material with substantially open cells.
  • the above foil was immediately transferred to a heat-laminating station, where a film of opacified unexpanded material composed of two layers, namely, a polystyrene layer and a sealing layer formed of a mixture of polyethylene and an EVA copolymer, and being 50-micron thick, was bonded to a bonding surface of the foil by laminating at a temperature of 160°C.
  • the bonding step by heat-lamination was carried out with the sealing layer facing the bonding surface of the open-cell expanded polystyrene foil.
  • the resulting composite sheet was perforated across the free surface of the unexpanded film using a set of metal needles, down part of the thickness of the open-cells expanded polystyrene foil.
  • a white-opacified multi-layer barrier film of the PE//EVOH//PS type manufactured by B-Pack and being 60-micron thick, was then bonded to the free surface of the foil to produce a perforated expanded composite sheet.
  • the last-mentioned laminating step was carried out at a temperature of 170°C and a feed rate of 15 m/min.
  • the perforated expanded composite sheet was transferred to a hot molding machine, where it was pre-heated at a mean temperature of 200°C for subsequent transfer into the thermoforming mold whence a semi-finished tray wasobtained.
  • the semi-finished tray was taken to an RF edge sealing arrangement, which included a lower die having an insulative dielectric foil of Mylar where the tray was correctly positioned on its inside, and an upper die formed of a brass electrode that was maintained at a temperature of 60°C and having a suitable geometry for edge sealing.
  • the RF edge sealing step was then carried out using a pressure of 55 kg/cm 2 , as measured at the tray edge, and radio-frequency at 27,12 MHz applied to the edge of the semi-finished tray for 2 seconds, whereafter the tray blank edge was allowed to cool for 3 seconds.
  • the sealing operation was performed at 5 cycles/min, and the edge thickness showed to have shrunk down to 300 microns upon after sealing.
  • the resulting edge-sealed tray was then shaken out and transferred to a packaging machine which is equipped with a chamber, the chamber being provided with a suitable die and apertured for drawing air out and/or letting a gas mixture in.
  • the tray After laying the food product to be packaged inside the tray, the tray was placed in said chamber along with a coverheld over it.
  • the chamber was then closed and its internal air drawn out by the application of a reduced pressure of 1-4 millibars.
  • a gas mixture comprising 70% oxygen and 30% carbon dioxide was then injected into the chamber.
  • the cover was heat sealed to the tray edge to produce a package according to the invention.
  • the gas permeability properties of the tray of the package according to the invention were evaluated by monitoring the behavior over time of the gaseous composition originally introduced into the package. These properties have also been compared with those of a tray of a conventional gas-barrier absorbent package.
  • the conventional package comprised a tray having a porous structure directed to absorb liquids, and a covering made of a gas-barrier film.
  • the tray structure included an open-cell expanded polystyrene layer bonded at the top and the bottom to corresponding inner and outer gas-barrier films.
  • the tray was sealed perimetrically of its bottom by a combination of pressure and ultrasonics to form a fluid-tight space, between the outer and inner gas-barrier films, adapted to absorb and hold liquids released from the food products.
  • Each barrier film of this prior art package was a multi-layer barrier film of the PE//EVOH//PStype. The conventional package was injected with the same gas composition as was used with the package according to the invention.
  • the gas composition was measured at predetermined time intervals on each package by means of an oxygen and carbon dioxide percent meter of the Check Mate 9900 Dansensor model type.
  • Table 1 Gas permeability of conventional package tray Time(days) O 2 (%) CO 2 (%) 0 66.3 28.7 1 55.3 22.1 3 49.5 19.2 5 35.2 12.7 7 30.8 8.6 10 27.3 6.4
  • Table 2 Gas permeability of the package tray according to the invention Time(days) O 2 (%) CO 2 (%) 0 65.8 30.8 1 63.1 26.2 3 63.0 26.5 5 62.9 26.1 7 64.5 25.1 10 63.6 24.9
  • both packages typically show a first change in the mixture composition after the first few hours from packaging, which is due to the mixture being diluted by residual air in the open-cells porous structure. Subsequently, the composition of the atmosphere inside the package according to the invention advantageously remains unaltered over time, to confirm the effectiveness of the edge sealing operation in the trayaccording to the invention.
  • the conventional package shows a progressive alteration and loss of the gas atmosphere originally established on its interior, so suggesting the occurrence of a near-constant effusion of gases from the interior of the porous tray structure to the outside, despite of the presence of the perimetric sealing on the tray bottom.
  • Figure 12 shows an electronic micrograph enlarged at 100X of a section of the tray edge in the above package of the invention. It can be seen that the edge structure forms a continuous of compact material into which the original open-cells structure shows to have substantially collapsed. Accordingly, gases diffusing into the porous structure of the tray meet a compact structure along the edge that will stop them from passing to the tray outside.
  • Figure 13 shows an electronic micrograph enlarged at 100X of a section of the tray edge in another package of the invention. It can be seen in this section of the edge that the structure includes two regions A and B between the inner and outer films which are constituted by closed cells, and a core region C intermediate said regions A and B, which is formed of compact material. Surprisingly, also the closed cells of regions A and B are impermeable to gas diffusion, as the gas permeability properties of the tray in this package are fully comparable with those reported in Table 2 and Figure 11 . This shows that a partially-fusion of the open-cells structure (in this example, its core region) can be adequate to produce the desired gas-barrier effect to the diffusion of the gas outside the trayand the retaining of the modified atmosphere therein.
  • the open-cells structure in this example, its core region
  • a semi-finished tray has been provided using the same procedure as in Example 1.
  • the semi-finished tray was transferred to a packaging machine whose chamber is equipped with a lower die, in which the semi-finished tray was correctly positioned in it, lower die being provided with an insulative dielectric foil of Mylar, an upper die, consisting of a brass electrode pre-heated at a temperature of 50°C and having a suitable geometry to permit sealing of the tray edge, and ports for drawing air out and/or letting a gas mixture in.
  • the semi-finished tray was transferred into said chamber along with a cover held over it.
  • the cover consisted of a multi-layer barrier film of the PET/EVOH/PE type with a thickness of 45 microns.
  • the chamber was then closed and its internal air drawn out by the application of a reduced pressure of 1-4 millibars. Thereafter, a gas mixture comprising 70% oxygen and 30% carbon dioxide was injected into the chamber.
  • the RF sealing process for the tray edge and the cover was carried out under a pressure of 55 kg/cm 2 , as measured at the sealing edge, such that the edge of the tray and the film of the cover over the edge were held and pressed together, while radio-frequency energy was delivered at 27.12 MHz for 2 seconds, whereafter the package of the invention was allowed to cool for 3 seconds.
  • the sealing operation was performed at 7 cycles/min, and the combined thickness of the tray edge and the covering showed to have been shrunk down to 320 microns after sealing.
  • a package of this invention, constructed as above, has excellent retention capabilities in the respect of the modified atmosphere originally established therein, such capabilities being fully comparable with those of the package according to the invention discussed in Example 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Packages (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
  • Laminated Bodies (AREA)

Claims (28)

  1. Schale (1) für eine unter Vakuum oder einer modifizierten Atmosphäre hergestellte Verpackung für Nahrungsmittelprodukte, die dazu neigen, Flüssigkeiten abzugeben, wobei die Schale (1) einen Boden (3) und Seitenwände (5) hat, die in einem Rand (6) enden, sowie mindestens zwei Schichten (7, 9) aufweist, von denen eine nach innen gewandte Schicht (7) eine Kunststofffolie mit einer Fähigkeit aufweist, von den Nahrungsmittelprodukten freigesetzte Flüssigkeiten zu absorbieren, mit Löchern oder Schlitzen (10) an zumindest einem Teil ihrer Oberfläche, und eine nach außen gewandte Schicht (7,9) aufweist, die durch eine Kunststoffdünnschicht mit Gassperreigenschaften gebildet ist; wobei zumindest eine der Schalenschichten (9) mindestens eine polare Komponente enthält, dadurch gekennzeichnet, dass ein Umfangsabschnitt der Schale (6; 13) durch Beaufschlagung mit Hochfrequenz und Druck derart versiegelt ist, dass die einzelnen Schichten zumindest teilweise mit dem Umfangsabschnitt verschmolzen sind und man die saugfähige Struktur zu einer dünnen Gassperrschicht (11; 12; 14; 15; 16) schrumpfen lässt, die zumindest einen Zwischenbereich aufweist, der aus einem im Wesentlichen verdichteten Material gebildet ist, wobei die Dicke der dünnen Gassperrschicht (11; 12; 14; 15; 16) 100 bis 1500 Mikrometer, vorzugsweise 300 bis 600 Mikrometer beträgt.
  2. Schale (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Umfangsabschnitt, in welchem das Versiegeln durch Beaufschlagung mit Hochfrequenz und Druck erfolgt, durch mindestens einen Randabschnitt, vorzugsweise durch den ganzen Schalenrand (6), oder einen Abschnitt (13) der Seitenwände gebildet ist.
  3. Schale (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die polare Komponente aus einer Gruppe ausgewählt ist, die Ethylenvinylalkohol (EVOH), Ethylenvinylacetat (EVA), Polymere und Copolymere aus EVA und EVOH, oberflächenaktive Stoffe, EMA, EBA und EEA umfasst.
  4. Schale (1) nach einem der vorhergehenden Ansprüche, wobei der Kunststoff mit Absorptionseigenschaften für Fluide aus einer Gruppe ausgewählt ist, die geschäumte thermoplastische Werkstoffe, insbesondere Polystyrol, Polypropylen, Polyethylen, Fasergewebe oder Faservliesmaterial, Kunststoffflockenmaterialien, sowie Polymere der erneuerbaren Art oder biologisch abbaubare Polymere umfasst.
  5. Schale (1) nach Anspruch 4, wobei es sich bei dem Kunststoff mit Absorptionseigenschaften für Fluide um Polystyrol handelt, welches im Wesentlichen offenzellig ist.
  6. Schale (1) nach einem der vorhergehenden Ansprüche, wobei die nach innen gewandte Schicht (7) zumindest einen oberflächenaktiven Stoff enthält.
  7. Schale (1) nach einem der vorhergehenden Ansprüche, darüber hinaus eine Schicht (8) aufweisend, die über der nach innen gewandten Schicht (7) der Schale (1) liegt und durch eine Dünnschicht oder eine ungeschäumte Folie aus einem aus einer einzigen Komponente bestehenden Kunststoff oder aus einem Kunststoffverbundmaterial, oder aus einer Verbunddünnschicht mit Gassperreigenschaften gebildet ist, und Schlitze oder Löcher (10) mindestens über den Boden (3) verteilt aufweist.
  8. Schale (1) nach Anspruch 7, wobei die Dünnschicht oder ungeschäumte Folie oder Verbunddünnschicht mit Gassperreigenschaften, welche die über der nach innen gewandten Schicht (7) liegende Schicht (8) bildet, opak hergestellt ist.
  9. Schale (1) nach Anspruch 7 oder 8, wobei die Dünnschicht oder ungeschäumte Folie einen Materialverbund bilden oder aus einem Einzelwerkstoff bestehen kann, und der Kunststoff der Dünnschicht oder ungeschäumten Folie aus einer Gruppe ausgewählt ist, die Polystyrol, Polyethylen (PE), Polypropylen (PP), Metallocene, Polyethylen niedriger Dichte (LDPE), lineares Polyethylen niedriger Dichte (LLDPE), EVA, Polymere und Copolymere aus EVA, Metallocene sowie Kombinationen hiervon umfasst.
  10. Schale (1) nach einem der vorhergehenden Ansprüche, wobei die einen Verbund bildenden Gassperrdünnschichten jeweils durch eine Mehrfachlagen-Dünnschicht gebildet sind, die zumindest eine Gassperrschicht aus einem Kunststoff und zumindest eine Schicht aus einem thermoplastischen Werkstoff umfasst.
  11. Schale (1) nach Anspruch 10, wobei der Kunststoff der Gassperrschicht aus einer Gruppe ausgewählt ist, die Polymere und Copolymere von Ethylenvinylalkohol (EVOH), Nylon, Polyvinylidenchlorid (PVDC), Poly- oder Copolyamide sowie Kombinationen hiervon umfasst.
  12. Schale (1) nach Anspruch 11, wobei der Kunststoff ein Polymer oder Copolymer von Ethylenvinylalkohol ist, oder es sich bei ihm um Nylon handelt.
  13. Schale (1) nach einem der vorhergehenden Ansprüche 10 bis 12, wobei die einen Materialverbund bildenden Gassperrdünnschichten aus demselben Kunststoff gebildet sind.
  14. Schale (1) nach einem der vorhergehenden Ansprüche, darüber hinaus eine zusätzliche Schicht (7a) aufweisend, die aus einer Folie aus ungeschäumtem Kunststoff und/oder einer Folie aus geschlossenzelligem, geschäumtem Kunststoff besteht, wobei die zusätzliche Schicht (7a) zwischen der nach innen gewandten Schicht (7), die durch eine Folie aus saugfähigem Kunststoff gebildet ist, und der nach außen gewandten Schicht (9) angeordnet ist, die durch eine Gassperrdünnschicht gebildet ist.
  15. Schale (1) nach Anspruch 14, wobei es sich bei dem geschäumten Kunststoff um Polystyrol handelt.
  16. Verpackung, die unter Vakuum oder einer modifizierten Atmosphäre hergestellt wird und für Nahrungsmittelprodukte geeignet ist, die dazu neigen, Flüssigkeiten abzugeben, wobei die Verpackung umfasst:
    eine Schale (1) nach einem der vorhergehenden Ansprüche,
    ein auf den Boden (3) der Schale (1) aufgelegtes Nahrungsmittelprodukt (4), das dazu neigt, Flüssigkeiten abzugeben;
    einen Deckel (2) für die Schale, der aus einer Gassperrdünnschicht aus einem Kunststoff besteht, welcher am Schalenrand (6) so anhaftet, dass im Inneren der Verpackung ein Vakuum oder eine Schutzatmosphäre aufrechterhalten bleibt.
  17. Verpackung, die unter Vakuum oder einer modifizierten Atmosphäre hergestellt wird und für Nahrungsmittelprodukte geeignet ist, die dazu neigen, Flüssigkeiten abzugeben, wobei die Verpackung umfasst:
    eine aus Kunststoff hergestellte Schale (1) mit einem Boden (3) und Seitenwänden (5), die in einem Rand (6) enden, wobei die Schale mindestens zwei Schichten (7, 9) umfasst, von denen eine nach innen gewandte Schicht (7) eine Folie aus Kunststoff umfasst, die dahingehend wirksam ist, von den Nahrungsmittelprodukten freigesetzte Flüssigkeiten zu absorbieren, und Schlitze oder Löcher (10) über zumindest einen Teil ihrer Oberfläche aufweist, und eine nach außen gewandten Schicht (9) aus einer Kunststoffdünnschicht mit Gassperreigenschaften hergestellt ist;
    ein auf den Boden (3) der Schale (1) aufgelegtes Nahrungsmittelprodukt (4), das dazu neigt, Flüssigkeiten abzugeben;
    einen Deckel (2) für die Schale (1), der aus einer Gassperrdünnschicht aus Kunststoff besteht, der zumindest mit einem Umfangsabschnitt des Schalenrandes (6) so versiegelt ist, dass im Inneren der Verpackung ein Vakuum oder eine Schutzatmosphäre aufrechterhalten bleibt,
    wobei zumindest eine der Schalenschichten (7, 9) und/oder der Deckel (2) eine polare Komponente aufweisen, dadurch gekennzeichnet, dass der Deckel (2) durch Beaufschlagung mit Druck und Hochfrequenz so mit mindestens einem Umfangsabschnitt des Schalenrandes (6) versiegelt ist, dass die einzelnen Schichten (7, 9) der Schale (1) und der Deckel (2) zumindest teilweise mit mindestens einem Umfangsrandabschnitt verschmolzen sind und man die saugfähige Struktur im Wesentlichen zu einer dünnen Gassperrschicht (18) schrumpfen lässt, die zumindest einen Zwischenbereich aus einem im Wesentlichen verdichteten Material aufweist,
    wobei die Dicke der dünnen Gassperrschicht (18) im Bereich von 100 bis 1500 Mikrometer, vorzugsweise im Bereich von 300 bis 600 Mikrometer liegt.
  18. Verpackung nach Anspruch 17, dadurch gekennzeichnet, dass der mindestens eine Umfangsabschnitt des Schalenrandes (6), in welchem das Versiegeln mit einem Deckel (2) durch Beaufschlagung mit Hochfrequenz und Druck erfolgt, durch den gesamten Schalenrand (6) gebildet ist.
  19. Verpackung nach einem der Ansprüche 16 bis 18, darüber hinaus eine Schicht (8) aufweisend, die an der nach innen gewandten Schicht (7) angeordnet ist und durch eine Dünnschicht oder ungeschäumte Folie aus einem aus einer einzigen Komponente bestehenden Werkstoff oder aus einem Kunststoffverbundmaterial, oder aus einer Verbunddünnschicht mit Gassperreigenschaften gebildet ist, und Löcher oder Schlitze (10) zumindest in Entsprechung mit dem Boden (3) aufweist.
  20. Verpackung nach einem der Ansprüche 16 bis 20, mit einer zusätzlichen Schicht (7a), die durch eine Folie aus ungeschäumtem Kunststoff und/oder einer Folie aus geschlossenzelligem, geschäumtem Kunststoff gebildet ist, wobei sich die zusätzliche Schicht (7a) zwischen der nach innen gewandten Schicht (7), die durch eine Folie aus saugfähigem Kunststoff gebildet ist, und der nach außen gewandten Schicht (9) erstreckt, die durch eine Gassperrdünnschicht gebildet ist.
  21. Verfahren zur Herstellung einer Schale (1) nach einem der Ansprüche 1 bis 13, wobei das Verfahren die folgenden Schritte umfasst:
    Bereitstellen eines perforierten Verbundflächenkörpers, der eine Folie aus einem saugfähigen Kunststoff (7) aufweist, welcher an einer Fläche mit einer einen Materialverbund bildenden Gassperrdünnschicht (9) verbunden ist und optional an der entgegengesetzten Fläche mit einer Dünnschicht oder Folie (8) aus einem ungeschäumten Kunststoff verbunden ist, wobei die Folie aus saugfähigem Kunststoff (7) und die ungeschäumte Dünnschicht oder Folie (8) mit Löchern oder Schlitzen (10) versehen ist, die sich über zumindest einen Teil der Dicke der Folie (7) aus saugfähigem Kunststoff erstrecken,
    Verformen des perforierten Verbundflächenkörpers zu einer Halbfertigschale mit einem Boden (3) und Seitenwänden (5), die in einem vorspringenden Rand (6) enden, wobei die einen Materialverbund bildende Gassperrdünnschicht (9) die untere Schicht der Halbfertigschale bildet;
    Versiegeln eines Umfangsabschnitts (6, 13) der Halbfertigschale durch Beaufschlagung mit Hochfrequenz, die im Bereich von 1 bis 300 MHz liegt und vorzugsweise 27,12 MHz beträgt, und einem Druck zwischen 10 und 1000 kg/cm2 gemessen am Versiegelungsrand, für eine Zeitspanne von 0,5 bis 2 Sekunden, um entlang des Umfangsabschnitts (6, 13) eine dünne Gassperrschicht (11; 14; 15; 16) zu bilden, die zumindest einen Zwischenbereich aus einem im Wesentlichen verdichteten Material aufweist und eine Dicke von 100 bis 1500 Mikrometer, vorzugsweise 300 bis 600 Mikrometer hat.
  22. Verfahren zur Herstellung einer Schale (1) aus Kunststoff nach Anspruch 14 oder 15, wobei das Verfahren die Schritte umfasst:
    Bereitstellen eines perforierten Verbundflächenkörpers, der eine Folie aus einem saugfähigen Kunststoff (7) aufweist, der an seinen entgegengesetzten Flächen mit einer ersten Dünnschicht oder Folie aus einem ungeschäumten Kunststoff (8) bzw. einer zweiten Folie (7a) aus ungeschäumtem Kunststoff und/oder einer Folie aus einem geschlossenzelligen, geschäumten Kunststoff verbunden ist, sowie eine einen Materialverbund bildende Gassperrdünnschicht (9) aufweist, die mit der zweiten Folie (7a) aus ungeschäumtem Kunststoff und/oder einer Folie aus geschlossenzelligem, geschäumtem Kunststoff verbunden ist, wobei die erste ungeschäumte Dünnschicht oder Folie (8) Löcher oder Schlitze (10) aufweist, die sich bis zumindest über einen Teil der Dicke der darunterliegenden Folie (7) aus saugfähigem Kunststoff erstrecken;
    Verformen des perforierten Verbundflächenkörpers zu einer Halbfertigschale mit einem Boden (3) und Seitenwänden (5), die in einem vorspringenden Rand (6) enden, wobei die den Materialverbund bildende Gassperrdünnschicht (9) die untere Schicht der Halbfertigschale bildet;
    Versiegeln eines Umfangsabschnitts (6) der Halbfertigschale (1) durch Beaufschlagung mit Hochfrequenz, die im Bereich von 1 bis 300 MHz liegt und vorzugsweise 27,12 MHz beträgt, und einem Druck zwischen 10 und 1000 kg/cm2 gemessen am Versiegelungsrand, für eine Zeitspanne von 0,5 bis 2 Sekunden, um entlang des Umfangsabschnitts (6) eine dünne Gassperrschicht (12) zu bilden, die zumindest einen Zwischenbereich aus einem im Wesentlichen verdichteten Material aufweist und eine Dicke von 100 bis 1500 Mikrometer, vorzugsweise 300 bis 600 Mikrometer hat.
  23. Verfahren nach Anspruch 21 oder 22, wobei die Beaufschlagung mit dem Druck und der Hochfrequenz während des Versiegelungsschritts ausgeführt wird, indem die Halbfertigschale in ein Werkzeug eingelegt wird, welches eine untere Elektrode bildet, indem der Umfangsabschnitt zwischen der unteren Elektrode und einer oberen Elektrode verpresst wird, die eine vorbestimmte Form hat und auf eine Temperatur von 30° bis 90 °C vorgewärmt ist, und indem an die Elektroden eine Hochfrequenz angelegt wird.
  24. Verfahren nach einem der Ansprüche 21 bis 23, wobei der Umfangsabschnitt (6; 13) durch zumindest einen Randabschnitt, vorzugsweise durch den gesamten Rand (6) der Halbfertigschale, oder durch einen Abschnitt (13) der Seitenwände (5) der Halbfertigschale (1) gebildet ist.
  25. Verfahren nach einem der Ansprüche 21 bis 24, wobei die Folie (7) aus saugfähigem Kunststoff durch eine Folie aus geschäumtem Polystyrol mit im Wesentlichen offenen Zellen gebildet ist, die optional zumindest einen oberflächenaktiven Stoff enthält.
  26. Verfahren zur Herstellung einer Verpackung unter Vakuum oder einer Schutzatmosphäre, zum Aufbewahren von Nahrungsmittelprodukten, die dazu neigen, Flüssigkeiten abzugeben, wobei das Verfahren die Schritte umfasst:
    Bereitstellen einer Schale (1) nach einem der Ansprüche 21 bis 25;
    Auflegen des zu verpackenden Nahrungsmittelprodukts auf den Boden (3) der Schale (1);
    Versiegeln der das Nahrungsmittelprodukt enthaltenden Schale (1) unter Vakuum oder einer Schutzatmosphäre, indem ein Deckel (2), der durch eine Gassperr-Verbunddünnschicht aus einem Kunststoff gebildet ist, mit dem Rand (6) der Schale (1), vorzugsweise durch Heißversiegelung.
  27. Verfahren zur Herstellung einer Verpackung nach einem der Ansprüche 17 bis 19, wobei das Verfahren die Schritte umfasst:
    Bereitstellen eines perforierten Verbundflächenkörpers mit einer Folie (7) aus saugfähigem Kunststoff, der an einer seiner Flächen mit einer Verbunddünnschicht (9) verbunden ist und optional an der entgegengesetzten Fläche mit einer Dünnschicht oder Folie (8) aus einem ungeschäumten Kunststoff verbunden ist, wobei die Folie aus saugfähigem Kunststoff (7) und die ungeschäumte Dünnschicht oder Folie (8) mit Löchern oder Schlitzen (10) ausgestattet ist, die sich zumindest über einen Teil der Dicke der Folie (7) des saugfähigen Kunststoffs erstrecken;
    Verformen des perforierten Verbundflächenkörpers zu einer Schale (1) mit einem Boden (3) und Seitenwänden (5), die in einem vorspringenden Rand (6) enden, wobei die den Materialverbund bildende Gassperrdünnschicht (9) die untere Schicht der Schale bildet;
    Auflegen eines zu verpackenden Nahrungsmittelprodukts (4) auf dem Boden (3) der Schale (1);
    Versiegeln der das Nahrungsmittelprodukt (4) enthaltenden Schale (1) unter Vakuum oder einer Schutzatmosphäre, indem ein Deckel (2), der durch eine Gassperr-Verbunddünnschicht aus einem Kunststoff gebildet ist, auf die Schale (1) aufgelegt wird und ein Druck zwischen 10 und 1000 kg/cm2 gemessen am Versiegelungsrand sowie eine Hochfrequenz, die im Bereich von 1 bis 300 MHz liegt und vorzugsweise 27,12 MHz beträgt, für eine Zeitspanne von 0,5 bis 2 Sekunden angelegt auf zumindest ein Umfangsabschnitt des Schalenrandes (16) und die Gassperrdünnschicht des über den mindestens einen Umfangsabschnitt des Schalenrandes (16) liegenden Deckels (2) angelegt werden, um zumindest eine dünne Gassperrschicht (12) zu bilden, die zumindest einen Zwischenbereich aus einem im Wesentlichen verdichteten Material aufweist und eine Dicke von 100 bis 1500 Mikrometer, vorzugsweise 300 bis 600 Mikrometer hat.
  28. Verfahren zur Herstellung einer Verpackung nach Anspruch 20, wobei das Verfahren die Schritte umfasst:
    Bereitstellen eines perforierten Verbundflächenkörpers, der eine Folie (7) aus saugfähigem Kunststoff aufweist, der an seinen entgegengesetzten Flächen mit einer ersten Dünnschicht oder Folie (8) aus einem ungeschäumten Kunststoff bzw. einer zweiten Folie (7a) aus ungeschäumtem Kunststoff und/oder einer Folie aus einem geschlossenzelligen, geschäumten Kunststoff verbunden ist, sowie eine Verbunddünnschicht (9) mit Gassperreigenschaften aufweist, die mit der Dünnschicht oder Folie (7a) aus ungeschäumtem Kunststoff verbunden ist, wobei die erste (8) ungeschäumte Dünnschicht oder Folie Löcher oder Schlitze (10) aufweist, die sich bis zumindest über einen Teil der Dicke der darunterliegenden Folie (7) aus saugfähigem Kunststoff erstrecken;
    Verformen des perforierten Verbundflächenkörpers zu einer Schale (1) mit einem Boden (3) und Seitenwänden (5), die in einem vorspringenden Rand (6) enden, wobei die einen Materialverbund bildende Gassperrdünnschicht (9) die untere Schicht der Schale (1) bildet;
    Auflegen eines zu verpackenden Nahrungsmittelprodukts (4) auf den Boden (3) der Schale (1);
    Versiegeln der das Nahrungsmittelprodukt (4) enthaltenden Schale (1) unter Vakuum oder einer modifizierten Atmosphäre, indem auf die Schale (1) ein Deckel (2) aufgesetzt wird, der aus einer einen Materialverbund bildenden Gassperrdünnschicht aus Kunststoff gebildet ist, und indem zumindest ein Umfangsabschnitt des Schalenrandes (6) und die Gassperrdünnschicht des Deckels (2), der über dem mindestens einen Umfangsabschnitt des Schalenrandes (6) liegt, für eine Zeitspanne von 0,5 bis 2 Sekunden ein Druck zwischen 10 und 1000 kg/cm2 gemessen am Versiegelungsrand, sowie eine Hochfrequenz angelegt werden, die im Bereich von 1 bis 300 MHz liegt und vorzugsweise 27,12 MHz beträgt, um eine dünne Gassperrschicht (12) zu erhalten, die mindestens einen Zwischenbereich aus einem im Wesentlichen verdichteten Material aufweist und eine Dicke von 100 bis 1500 Mikrometer, vorzugsweise 300 bis 600 Mikrometer hat.
EP05425887A 2005-12-15 2005-12-15 Verpackung für Lebensmittel, die Flüssigkeit abgeben, mittels Vakuum oder Schutzatmosphäre Not-in-force EP1798160B1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
ES05425887T ES2340775T3 (es) 2005-12-15 2005-12-15 Envase para la conservacion a vacio o en atmosfera protectora de productos alimenticios que tienden a liberar liquidos.
PL05425887T PL1798160T3 (pl) 2005-12-15 2005-12-15 Opakowanie do konserwacji produktów żywnościowych, które mają tendencję do uwalniania cieczy, z wykorzystaniem próżni lub atmosfery ochronnej
DK05425887.6T DK1798160T3 (da) 2005-12-15 2005-12-15 Emballage til konservering under vakuum eller i beskyttelsesatmosfære af fødevareprodukter, som er tilbøjelige til at afgive væsker
DE602005019433T DE602005019433D1 (de) 2005-12-15 2005-12-15 Verpackung für Lebensmittel, die Flüssigkeit abgeben, mittels Vakuum oder Schutzatmosphäre
EP05425887A EP1798160B1 (de) 2005-12-15 2005-12-15 Verpackung für Lebensmittel, die Flüssigkeit abgeben, mittels Vakuum oder Schutzatmosphäre
PT05425887T PT1798160E (pt) 2005-12-15 2005-12-15 Embalagem a vácuo ou atmosfera protectora para a conservação de produtos alimentares que libertam líquido
AT05425887T ATE457938T1 (de) 2005-12-15 2005-12-15 Verpackung für lebensmittel, die flüssigkeit abgeben, mittels vakuum oder schutzatmosphäre
SI200530985T SI1798160T1 (sl) 2005-12-15 2005-12-15 Embalaža za konzerviranje tekočine oddajajočihprehrambenih izdelkov v vakuumu ali zaščitni atmosferi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425887A EP1798160B1 (de) 2005-12-15 2005-12-15 Verpackung für Lebensmittel, die Flüssigkeit abgeben, mittels Vakuum oder Schutzatmosphäre

Publications (2)

Publication Number Publication Date
EP1798160A1 EP1798160A1 (de) 2007-06-20
EP1798160B1 true EP1798160B1 (de) 2010-02-17

Family

ID=36099696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425887A Not-in-force EP1798160B1 (de) 2005-12-15 2005-12-15 Verpackung für Lebensmittel, die Flüssigkeit abgeben, mittels Vakuum oder Schutzatmosphäre

Country Status (8)

Country Link
EP (1) EP1798160B1 (de)
AT (1) ATE457938T1 (de)
DE (1) DE602005019433D1 (de)
DK (1) DK1798160T3 (de)
ES (1) ES2340775T3 (de)
PL (1) PL1798160T3 (de)
PT (1) PT1798160E (de)
SI (1) SI1798160T1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2361759B1 (de) * 2010-07-01 2012-09-26 COOPBOX Eastern S.r.o. Blatt aus Kunststoffmaterial, Schale für ein Lebensmittelprodukt aus dem besagten Blatt Verpackung mit besagter Schale und zugehöriges Herstellungsverfahren
WO2016043593A1 (en) * 2014-09-19 2016-03-24 Zenkova Sofia Package and storage means for nutrients
DE102017007581A1 (de) 2017-08-11 2019-02-14 Die Frischemanufaktur GmbH Behältervorrichtung zur Aufnahme von zum menschlichen Verzehr bestimmten Produkten

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240133A (en) * 1991-04-15 1993-08-31 James River Paper Company, Inc. Clamped-wave lid seal structure
US5527570A (en) * 1991-06-28 1996-06-18 Centro Sviluppo Settori Impiego S.R.L. Multilayer multifunctional packaging elements
US5645904A (en) * 1991-12-11 1997-07-08 Baxter International Inc. Method and compositions that render materials RF responsive
EP0849309B1 (de) * 1996-12-18 2000-03-08 SIRAP-GEMA S.p.A. Verfahren zur Herstellung einer offenzelligen Polystyrolschaumfolie und daraus hergestellte Verpackungsschale
GB9902556D0 (en) * 1999-02-06 1999-03-24 Linpac Plastics Ltd Container
ITMI20020678A1 (it) * 2002-03-29 2003-09-29 Sirap Gema Spa Confezione per la conservazione sottovuoto o in atmosfera protettiva di alimenti suscettibili di rilasciare liquidi e/o aeriformi

Also Published As

Publication number Publication date
SI1798160T1 (sl) 2010-06-30
PL1798160T3 (pl) 2010-07-30
PT1798160E (pt) 2010-04-09
DK1798160T3 (da) 2010-06-14
DE602005019433D1 (de) 2010-04-01
EP1798160A1 (de) 2007-06-20
ES2340775T3 (es) 2010-06-09
ATE457938T1 (de) 2010-03-15

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