EP0372348A1 - Packaging for sliced food, particularly for sliced cheese - Google Patents

Packaging for sliced food, particularly for sliced cheese Download PDF

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Publication number
EP0372348A1
EP0372348A1 EP89121862A EP89121862A EP0372348A1 EP 0372348 A1 EP0372348 A1 EP 0372348A1 EP 89121862 A EP89121862 A EP 89121862A EP 89121862 A EP89121862 A EP 89121862A EP 0372348 A1 EP0372348 A1 EP 0372348A1
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EP
European Patent Office
Prior art keywords
film
packaging
heat
seal layer
food
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89121862A
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German (de)
French (fr)
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EP0372348B1 (en
Inventor
Lothar Sieben
Heinz-Werner Rohrka
Günter Koslowski
Rolf Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Produktions und Vertriebs GmbH and Co oHG
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Hoechst AG
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Publication date
Priority claimed from DE8815034U external-priority patent/DE8815034U1/en
Priority claimed from DE8908628U external-priority patent/DE8908628U1/en
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to AT8989121862T priority Critical patent/ATE105253T1/en
Publication of EP0372348A1 publication Critical patent/EP0372348A1/en
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Publication of EP0372348B1 publication Critical patent/EP0372348B1/en
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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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
    • B65D85/76—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials for cheese
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/04—Articles or materials wholly enclosed in single sheets or wrapper blanks
    • B65D75/20—Articles or materials wholly enclosed in single sheets or wrapper blanks in sheets or blanks doubled around contents and having their opposed free margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details

Definitions

  • the invention relates to a packaging for disc-shaped food with a substantially rectangular area of the type mentioned in the preamble of claim 1.
  • polyester films have been used to produce packaging of this type, which were first provided with a heat-sealable coating over the entire surface, and then printed on their coated surface in a further step.
  • This process has the disadvantage that it requires a number of process steps and is therefore very complex.
  • the sealing temperature should be relatively low, so that a relatively short exposure time of the sealing tool is required.
  • the sealed packaging should be tightly closed and still be easy to open by hand.
  • the friction coefficient of the film surface should not deteriorate due to residual moisture still adhering be tert, but remain practically constant compared to the dry state of the film surface.
  • the film suitable for producing the packaging consists of a single-layer or a coextruded multilayer polyester film, in particular a polyethylene terephthalate film, which is oriented by biaxial stretching and fixing.
  • Their density is usually less than 1.4 g / cm3, their thickness is in the range from 8 to 30, in particular 10 to 23, micrometers.
  • films can consist of transparent or opaque, single-ply or of a coextruded multilayer, biaxially stretched polyolefin film, the base layer consisting essentially of propylene polymers and the cover layers on one or both sides of olefin polymers, in particular propylene polymers.
  • Their density is between 0.55 and 0.91 g / cm3, their thickness in the range of 8 to 50, in particular 10 to 40 micrometers.
  • the heat-sealable olefin copolymer preferably comprises ethylene and optionally propylene and / or butylene units and is applied to the film in aqueous dispersion, the solids content of the dispersion usually being 40 to 70% by weight, based on the total weight of the dispersion. After removing the dispersant, a strip-like coating is obtained from the olefin copolymer.
  • the thickness of the Layer depends on the desired seal seam strength. A layer thickness of 1 to 5 micrometers is usually applied.
  • the strip-shaped, heat-sealable layer extends in the vicinity and parallel to an edge zone of the film web and usually has a width of 1 to 10 mm, in particular 2 to 4 mm.
  • the packaging has on its outside a water-repellent layer based on organosilicon compounds, preferably polydialkylsiloxane, the alkyl radicals in particular having 1 to 4 carbon atoms.
  • the polydialkylsiloxane is particularly preferably a polydimethylsiloxane.
  • the polydialkylsiloxane, in particular polydimethylsiloxane has a kinematic viscosity of 103 to 105, in particular 5,000 to 50,000 mm2 / s (25 ° C).
  • the application weight of the component is preferably between 0.01 and 20 g / m2, in particular 0.05 to 1 g / m2.
  • DE-OS 35 09 384 has already disclosed a polyolefin film in which one sealable surface layer contains polydialkylsiloxane incorporated and the other sealable surface layer has polydialkylsiloxane only on the outer surface, and the multilayer film of DE-OS 35 17 795 also contains at least in one of the two non-sealable surface layers is a polydialkylsiloxane. Both films are also to be used for packaging purposes.
  • neither publication can give the person skilled in the art an indication of the solution to the present problem, namely to prevent the insufficiently dried packaging from blocking.
  • the application of the strip-like layer of heat-sealable olefin copolymer, the printing and, if appropriate, the full-surface application of the additive component for water-repellent impregnation and for improving the coefficient of friction in the form of polydialkylsiloxane are carried out simultaneously in one operation, so that one or two further operations are saved.
  • the silicon-organic compound is expediently first applied to the film and immediately afterwards the film is provided with the sealable strip and printed.
  • the application of the heat-sealable polymer and the organosilicon compound and the printing on the film surface are advantageously carried out on the same gravure or flexographic printing system.
  • the goods to be packed e.g. B. a rectangular cheese slice
  • a tube is usually first formed from the flat film on a vertical form-fill and seal machine and the longitudinal-axial seam is formed along the strip-shaped sealing layer.
  • the food is filled into the tube in a pasty form from above.
  • the filled tube is flattened and compressed in transverse web-like zones to such an extent that the pasty food between the two layers of film is almost completely removed is.
  • the flat film tube is cut at right angles to the sealing seam in the web-like zones.
  • the packaging is closed only by pressing the film layers lying one above the other, the film layers, however, being glued to one another by small amounts of intermediate food solidified by the cooling.
  • the following example illustrates the improved surface properties and the heat sealability of the films to be used for packaging.
  • a single-layer, biaxially stretch-oriented polyethylene terephthalate film (PETP) with a thickness of 12 micrometers and a co-extruded three-layer, non-sealable polypropylene film (BOPP) with a thickness of 15 micrometers are flexo-printed with polydimethylsiloxane, kinematic viscosity 30,000 mm2 / s (25 ° C) , fully coated; immediately thereafter, an aqueous dispersion of ethylene-propylene copolymer is applied in strip form in flexographic printing and the film surface is provided with a colored print image by flexographic printing. The application of the two connections and the printing take place in the same printing press.
  • PETP film For comparison, another pattern made of PETP film is printed analogously and with a full-surface coating of heat-sealable vinylidene chloride copolymer (PVDC), application in aqueous dispersion. Coating with polydimethylsiloxane is not necessary.
  • PVDC heat-sealable vinylidene chloride copolymer
  • the PETP and BOPP films After being blown with air, the PETP and BOPP films had less water adhesion to the film surface than the PVDC-coated PETP film.
  • test strips 10 cm long and 15 mm wide are cut from the three samples and sealed against a test strip made of uncoated polyester and polypropylene film at 120 ° C and 5 bar pressure for 0.5 s.
  • a test strip made of uncoated polyester and polypropylene film at 120 ° C and 5 bar pressure for 0.5 s.
  • the single figure shows an embodiment of the packaging in perspective.
  • a rectangular cheese slice 9 is completely encased by the closely fitting flat film 1.
  • the overlapping edge zones 2, 3 of the film 1, which is bent in a tube shape around the cheese slice, are connected to one another in the area of the strip-shaped heat seal layer 4 made of ethylene copolymer, the heat seal layer 4 extends in the vicinity and parallel to the edge 12 of the film 1.
  • a printed field is shown schematically shown and at 13 the full surface coating with polydialkylsiloxane.
  • the printing ink is on the layer of polydialkylsiloxane.
  • web-like regions 6, 7 extend in the right and left of the packaged cheese slice, in which the two layers of film 10, 11 lying one above the other only adhere to one another through an extremely thin cheese layer 8 enclosed between them.
  • the cheese layer is much thicker, usually a few millimeters.

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

Abstract

The packaging for sliced food with an essentially rectangular surface, in particular for sliced cheese, consists of a film (1) which is wrapped in the form of a flat tube around the food (9) to be packed and completely encloses the latter, the two longitudinally axial edge zones of the film overlapping and being interconnected by means of a heat-seal layer (4) on the film. The heat-seal layer (4) extends in a strip-like manner close and parallel to an edge (12) of the film and consists essentially of a heat-sealable olefin copolymer. The film is possibly printed outside the heat-seal layer. In a perferred embodiment, the packaging exterior has a coating (13) made of an organosilicon compound, preferably a polydialkylsiloxane. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Verpackung für scheibenförmige Lebensmittel mit im wesentlichen recht­eckiger Fläche von der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a packaging for disc-shaped food with a substantially rectangular area of the type mentioned in the preamble of claim 1.

Zur Herstellung dieser Verpackung ist es bekannt, die Folie zu einem Schlauch zu formen und in den Schlauch die erhitzte, viskose Käsemasse einzufüllen. Der gefüllte schlauchförmige Folienstrang wird flach gedrückt und der nun bandförmige Käsestrang durch quer verlaufende stegar­tige Zonen in einzelne, noch zusammenhängende gefüllte Abschnitte unterteilt. Zum Abkühlen und Verfestigen der heißen Käsemasse wird der bandförmige Folien-Käse-Strang durch ein Wasserbad geführt und die Folienaußenseite an­schließend mit Luft angeblasen, um das noch anhaftende Wasser zu entfernen. Schließlich wird der Strang im Be­reich der quer verlaufenden stegartigen Zonen in einzelne verpackte Käsescheiben unterteilt und die Einzelpackungen gestapelt.To produce this packaging, it is known to form the film into a tube and to fill the tube with the heated, viscous cheese mass. The filled tubular film strand is pressed flat and the now band-shaped cheese strand is divided into individual, still connected, filled sections by transverse web-like zones. To cool and solidify the hot cheese mass, the ribbon-shaped film-cheese strand is passed through a water bath and the outside of the film is then blown with air to remove the water still adhering. Finally, the strand is divided into individually packaged cheese slices in the region of the cross-web-like zones and the individual packs are stacked.

Zur Herstellung von Verpackungen dieser Art werden bisher Polyesterfolien verwendet, die zunächst vollflächig mit einer heißsiegelfähigen Lackierung versehen wurden, danach auf ihrer lackierten Oberfläche in einem weiteren Schritt bedruckt wurden. Dieses Verfahren hat den Nach­teil, daß es eine Reihe von Verfahrensschritten erfordert und damit sehr aufwendig ist.Up to now, polyester films have been used to produce packaging of this type, which were first provided with a heat-sealable coating over the entire surface, and then printed on their coated surface in a further step. This process has the disadvantage that it requires a number of process steps and is therefore very complex.

Es ist deshalb Aufgabe der Erfindung, die bekannte Ver­packung dahingehend zu verbessern, daß sie sich ein­facher herstellen läßt. Die Versiegelungstemperatur soll relativ niedrig sein, so daß eine relativ kurze Einwirkungszeit des Versiegelungswerkzeugs erforderlich ist. Die versiegelte Verpackung soll fest verschlossen sein und sich dennoch leicht von Hand wieder öffnen lassen.It is therefore an object of the invention to improve the known packaging so that it is easier to manufacture. The sealing temperature should be relatively low, so that a relatively short exposure time of the sealing tool is required. The sealed packaging should be tightly closed and still be easy to open by hand.

Diese Aufgabe wird gelöst durch die Verpackung mit den im Anspruch 1 genannten Merkmalen.This object is achieved by the packaging with the features mentioned in claim 1.

Durch die Erfindung soll ein weiteres Problem gelöst werden.Another problem is to be solved by the invention.

Bei den bisher eingesetzten Folien verbleibt an der Fo­lienoberfläche nach dem Anblasen mit Luft noch relativ viel Restfeuchte haften. Durch diese Restfeuchte wird der Reibungskoeffizient der Folienoberfläche verschlechtert, und es treten Probleme beim Stapeln der einzelnen Packun­gen auf. Dadurch ergeben sich hohe Ausschußquoten im Sor­tier- und Stapelsystem.In the films used to date, a relatively large amount of residual moisture remains adhering to the film surface after being blown with air. As a result of this residual moisture, the coefficient of friction of the film surface deteriorates and problems arise when the individual packs are stacked. This results in high reject rates in the sorting and stacking system.

Es ist deshalb eine weitere Aufgabe der Erfindung, die bekannte Verpackung für scheibenförmige Lebensmittel, insbesondere von Käsescheiben, dahingehend zu verbessern, daß auch die zuletzt genannten Probleme nicht auftreten.It is therefore a further object of the invention to improve the known packaging for disc-shaped foods, in particular cheese slices, in such a way that the latter problems do not occur.

Weiter soll durch noch anhaftende Restfeuchte der Rei­bungskoeffizient der Folienoberfläche nicht verschlech­ tert werden, sondern im Vergleich zum Trockenzustand der Folienoberfläche praktisch konstant bleiben.Furthermore, the friction coefficient of the film surface should not deteriorate due to residual moisture still adhering be tert, but remain practically constant compared to the dry state of the film surface.

Diese Aufgabe wird gelöst durch die Verpackung mit den Merkmalen der Ansprüche 1 und 2.This object is achieved by the packaging with the features of claims 1 and 2.

Die zur Herstellung der Verpackung geeignete Folie be­steht aus einer einlagigen oder einer coextrudierten mehrschichtigen Polyesterfolie, insbesondere einer Poly­ethylenterephthalatfolie, die durch biaxiale Streckung und Fixierung orientiert ist. Ihre Dichte ist gewöhnlich kleiner als 1,4 g/cm³, ihre Dicke liegt im Bereich von 8 bis 30, insbesondere 10 bis 23 Mikrometern. Ebenso können Folien aus transparenten oder opaken, einlagigen oder aus einer coextrudierten mehrschichtigen, biaxial gestreckten Polyolefinfolie bestehen, wobei die Basisschicht im we­sentlichen aus Propylenpolymeren und die Deckschichten einseitig oder beidseitig aus Olefinpolymeren, insbeson­dere aus Propylenpolymeren, bestehen. Ihre Dichte liegt zwischen 0,55 und 0,91 g/cm³, ihre Dicke im Bereich von 8 bis 50, insbesondere 10 bis 40 Mikrometern.The film suitable for producing the packaging consists of a single-layer or a coextruded multilayer polyester film, in particular a polyethylene terephthalate film, which is oriented by biaxial stretching and fixing. Their density is usually less than 1.4 g / cm³, their thickness is in the range from 8 to 30, in particular 10 to 23, micrometers. Likewise, films can consist of transparent or opaque, single-ply or of a coextruded multilayer, biaxially stretched polyolefin film, the base layer consisting essentially of propylene polymers and the cover layers on one or both sides of olefin polymers, in particular propylene polymers. Their density is between 0.55 and 0.91 g / cm³, their thickness in the range of 8 to 50, in particular 10 to 40 micrometers.

Das heißsiegelfähige Olefinmischpolymerisat umfaßt vor­zugsweise Ethylen- und gegebenenfalls Propylen- und/oder Butylen-Einheiten und wird in wäßriger Dispersion auf die Folie aufgebracht, wobei der Festkörpergehalt der Disper­sion gewöhnlich 40 bis 70 Gew.-%, bezogen auf das Gesamt­gewicht der Dispersion, beträgt. Nach dem Entfernen des Dispersionsmittels erhält man einen streifenförmigen Überzug aus dem Olefinmischpolymerisat. Die Dicke der Schicht hängt von der gewünschten Siegelnahtfestigkeit ab. Gewöhnlich wird eine Schichtdicke von 1 bis 5 Mikro­metern aufgetragen. Die streifenförmige, heißsiegelfähige Schicht erstreckt sich in der Nähe und parallel zu einer Randzone der Folienbahn und hat gewöhnlich eine Breite von 1 bis 10 mm, insbesondere 2 bis 4 mm.The heat-sealable olefin copolymer preferably comprises ethylene and optionally propylene and / or butylene units and is applied to the film in aqueous dispersion, the solids content of the dispersion usually being 40 to 70% by weight, based on the total weight of the dispersion. After removing the dispersant, a strip-like coating is obtained from the olefin copolymer. The thickness of the Layer depends on the desired seal seam strength. A layer thickness of 1 to 5 micrometers is usually applied. The strip-shaped, heat-sealable layer extends in the vicinity and parallel to an edge zone of the film web and usually has a width of 1 to 10 mm, in particular 2 to 4 mm.

In bevorzugter Ausführungsform besitzt die Verpackung auf ihrer Außenseite eine wasserabstoßende Schicht auf Basis von siliziumorganischen Verbindungen, vorzugsweise von Polydialkylsiloxan, wobei die Alkylreste insbesondere 1 bis 4 C-Atome aufweisen. Besonders bevorzugt ist das Polydialkylsiloxan ein Polydimethylsiloxan. Das Polydialkylsiloxan, insbesondere Polydimethylsiloxan, hat eine kinematische Viskosität von 10³ bis 10⁵, insbeson­dere 5 000 bis 50 000 mm²/s (25 °C). Das Auftragsgewicht der Komponente beträgt vorzugsweise zwischen 0,01 und 20 g/m², insbesondere 0,05 bis 1 g/m².In a preferred embodiment, the packaging has on its outside a water-repellent layer based on organosilicon compounds, preferably polydialkylsiloxane, the alkyl radicals in particular having 1 to 4 carbon atoms. The polydialkylsiloxane is particularly preferably a polydimethylsiloxane. The polydialkylsiloxane, in particular polydimethylsiloxane, has a kinematic viscosity of 10³ to 10⁵, in particular 5,000 to 50,000 mm² / s (25 ° C). The application weight of the component is preferably between 0.01 and 20 g / m², in particular 0.05 to 1 g / m².

Aus der DE-OS 35 09 384 ist zwar bereits eine Polyolefin­folie bekannt geworden, bei der eine siegelbare Oberflä­chenschicht Polydialkylsiloxan inkorporiert enthält und die andere siegelbare Oberflächenschicht nur auf der Außenfläche Polydialkylsiloxan aufweist, und auch die Mehrschichtfolie der DE-OS 35 17 795 enthält zumindest in einer der beiden nicht siegelfähigen Oberflächenschichten ein Polydialkylsiloxan. Beide Folien sollen auch für Ver­packungszwecke eingesetzt werden. Einen Hinweis zur Lö­sung des vorliegenden Problems, nämlich das Blocken der unzureichend getrockneten Verpackung zu verhindern, kön­nen jedoch beide Druckschriften dem Fachmann nicht geben.DE-OS 35 09 384 has already disclosed a polyolefin film in which one sealable surface layer contains polydialkylsiloxane incorporated and the other sealable surface layer has polydialkylsiloxane only on the outer surface, and the multilayer film of DE-OS 35 17 795 also contains at least in one of the two non-sealable surface layers is a polydialkylsiloxane. Both films are also to be used for packaging purposes. However, neither publication can give the person skilled in the art an indication of the solution to the present problem, namely to prevent the insufficiently dried packaging from blocking.

Der Auftrag der streifenförmigen Schicht aus heißsie­gelfähigem Olefinmischpolymerisat, die Bedruckung sowie gegebenenfalls das vollflächige Aufbringen der Additiv­komponente zur wasserabstoßenden Imprägnierung und zur Verbesserung des Reibungskoeffizienten in Form von Polydialkylsiloxan erfolgen gleichzeitig in einem Arbeitsgang, so daß ein bzw. zwei weitere Arbeitsgänge eingespart werden. Beim Verfahren zur Herstellung der Folie wird zweckmäßigerweise zunächst die siliziumorga­nische Verbindung auf die Folie aufgebracht und unmit­telbar danach die Folie mit dem siegelfähigen Streifen versehen und bedruckt. Das Aufbringen des heißsiegel­fähigen Polymeren und der siliziumorganischen Verbin­dung sowie das Bedrucken der Folienoberfläche erfolgt zweckmäßigerweise auf der gleichen Tiefdruck- oder Fle­xodruckanlage.The application of the strip-like layer of heat-sealable olefin copolymer, the printing and, if appropriate, the full-surface application of the additive component for water-repellent impregnation and for improving the coefficient of friction in the form of polydialkylsiloxane are carried out simultaneously in one operation, so that one or two further operations are saved. In the process for producing the film, the silicon-organic compound is expediently first applied to the film and immediately afterwards the film is provided with the sealable strip and printed. The application of the heat-sealable polymer and the organosilicon compound and the printing on the film surface are advantageously carried out on the same gravure or flexographic printing system.

Zur Herstellung der Verpackung wird das zu verpackende Gut, z. B. eine rechteckige Käsescheibe, von der bahnför­mig zugeführten schlauchförmig gebogenen Flachfolie eng anliegend umhüllt und die beiden sich überlappenden Rand­zonen der Flachfolie in der Hitze im bereich der heißsie­gelfähigen Schicht versiegelt. Gewöhnlich wird hierzu auf einer vertikalen Form-Füll-Schließmaschine aus der Flach­folie zunächst ein Schlauch geformt und die längsaxiale Naht entlang der streifenförmigen Siegelschicht gebildet. Gleichzeitig wird von oben in den Schlauch das Lebensmit­tel in pastöser Form eingefüllt. Der gefüllte Schlauch wird flachgedrückt und in quer verlaufenden stegartigen Zonen soweit zusammengepreßt, daß das pastöse Lebensmit­tel zwischen den beiden Folienlagen fast völlig entfernt ist. Nach Durchlaufen eines kalten Wasserbades wird der flachliegende Folienschlauch im rechten Winkel zur Sie­gelnaht in den stegartigen Zonen durchtrennt. In den bei­den Trennkanten ist die Verpackung nur durch Verpressen der übereinanderliegenden Folienlagen verschlossen, wobei die Folienlagen allerdings durch geringe Mengen von da­zwischenliegendem, durch die Abkühlung verfestigtem Le­bensmittel miteinander verklebt sind.To produce the packaging, the goods to be packed, e.g. B. a rectangular cheese slice, wrapped tightly by the web-shaped tubular flat film and the two overlapping edge zones of the flat film sealed in the heat in the region of the heat-sealable layer. For this purpose, a tube is usually first formed from the flat film on a vertical form-fill and seal machine and the longitudinal-axial seam is formed along the strip-shaped sealing layer. At the same time, the food is filled into the tube in a pasty form from above. The filled tube is flattened and compressed in transverse web-like zones to such an extent that the pasty food between the two layers of film is almost completely removed is. After passing through a cold water bath, the flat film tube is cut at right angles to the sealing seam in the web-like zones. In the two separating edges, the packaging is closed only by pressing the film layers lying one above the other, the film layers, however, being glued to one another by small amounts of intermediate food solidified by the cooling.

Die verbesserten Oberflächeneigenschaften und die Heiß­siegelfähigkeit der für die Verpackung zu verwendenden Folien werden anhand des nachfolgenden Beispiels verdeut­licht.The following example illustrates the improved surface properties and the heat sealability of the films to be used for packaging.

Eine einlagige, biaxial streckorientierte Polyethylen­terephthalatfolie (PETP) mit einer Dicke von 12 Mikrome­tern und eine coextrudierte dreischichtige, nicht siegel­fähige Polypropylenfolie (BOPP) mit einer Dicke von 15 Mikrometern werden im Flexodruck mit Polydimethylsiloxan, kinematische Viskosität 30 000 mm²/s (25 °C), vollflächig beschichtet; unmittelbar danach wird streifenförmig eine wäßrige Dispersion aus Ethylen-Propylen-Mischpolymerisat im Flexodruck aufgetragen und die Folienoberfläche durch Flexodruck mit einem farbigen Druckbild versehen. Der Auftrag der zwei Verbindungen und die Bedruckung erfol­gen in der gleichen Druckmaschine.A single-layer, biaxially stretch-oriented polyethylene terephthalate film (PETP) with a thickness of 12 micrometers and a co-extruded three-layer, non-sealable polypropylene film (BOPP) with a thickness of 15 micrometers are flexo-printed with polydimethylsiloxane, kinematic viscosity 30,000 mm² / s (25 ° C) , fully coated; immediately thereafter, an aqueous dispersion of ethylene-propylene copolymer is applied in strip form in flexographic printing and the film surface is provided with a colored print image by flexographic printing. The application of the two connections and the printing take place in the same printing press.

Zum Vergleich wird ein anderes Muster aus PETP-Folie ana­log bedruckt und mit einer vollflächigen Beschichtung aus heißsiegelfähigem Vinylidenchlorid-Mischpolymerisat (PVDC), Auftrag in wäßriger Dispersion, versehen. Die Be­schichtung mit Polydimethylsiloxan entfällt.For comparison, another pattern made of PETP film is printed analogously and with a full-surface coating of heat-sealable vinylidene chloride copolymer (PVDC), application in aqueous dispersion. Coating with polydimethylsiloxane is not necessary.

Die Messung des Reibungskoeffizienten erfolgt nach TNO (veröffentlicht in "Measurement of coefficient of fric­tion at flexible packaging materials", J.W. Dorsteen und E. Mot, Packaging India, Vol. 5, No. 3, April/June 1973) vor dem Wasserkontakt und nach Wasserkontakt und Abbla­sen des Wassers mit Luft. Reibungskoeffizient vor Wasserkontakt nach Wasserkontakt und Trocknung PETP/Siegelstreifen 0,10 - 0,15 0,12 - 0,17 BOPP/Siegelstreifen 0,10 - 0,15 0,12 - 0,17 PETP/PVDC 0,20 - 0,25 0,25 - 0,30 The measurement of the coefficient of friction takes place according to TNO (published in "Measurement of coefficient of friction at flexible packaging materials", JW Dorsteen and E. Mot, Packaging India, Vol. 5, No. 3, April / June 1973) before and after water contact Contact with water and blowing off water with air. Coefficient of friction before contact with water after contact with water and drying PETP / sealing strips 0.10 - 0.15 0.12 - 0.17 BOPP / sealing strips 0.10 - 0.15 0.12 - 0.17 PETP / PVDC 0.20-0.25 0.25-0.30

Die Folien aus PETP und BOPP hatten nach dem Anblasen mit Luft eine geringere Wasserhaftung an der Folienoberfläche als die PVDC-beschichtete PETP-Folie.After being blown with air, the PETP and BOPP films had less water adhesion to the film surface than the PVDC-coated PETP film.

Zur Überprüfung der Siegelnahtfestigkeit werden aus den drei Proben jeweils Prüfstreifen von 10 cm Länge und 15 mm Breite geschnitten und jeweils gegen einen Prüf­streifen aus unbeschichteter Polyester- und Polypropylen­folie bei 120 °C und 5 bar Druck 0,5 s lang gesiegelt. Bei der Siegelung der PVDC-Beschichtung gegen eine unbe­schichtete Polyesterfolie ergibt sich keine Verbindung, dagegen beträgt die Kraft, die erforderlich ist, um die Polyesterfolie und Polypropylenfolie mit der Ethylenco­polymerschicht von der dagegen gesiegelten unbeschichte­ten Folie abzuziehen, 0,5 bis 0,8 N/15 mm.To check the seal seam strength, test strips 10 cm long and 15 mm wide are cut from the three samples and sealed against a test strip made of uncoated polyester and polypropylene film at 120 ° C and 5 bar pressure for 0.5 s. When the PVDC coating is sealed against an uncoated polyester film, there is no connection, but the force required is the Peel off the polyester film and polypropylene film with the ethylene copolymer layer from the uncoated film sealed against it, 0.5 to 0.8 N / 15 mm.

Die einzige Figur zeigt eine- Ausführungsform der Ver­packung in perspektivischer Darstellung. Eine rechteckige Käsescheibe 9 ist von der eng anliegenden Flachfolie 1 vollständig umhüllt. Die überlapppenden Randzonen 2,3 der schlauchförmig um die Käsescheibe gebogenen Folie 1 sind im Bereich der streifenförmigen Heißsiegelschicht 4 aus Ethylenmischpolymerisat miteinander verbunden, die Heiß­siegelschicht 4 erstreckt sich in der Nähe und parallel zum Rand 12 der Folie 1. Mit 5 ist ein bedrucktes Feld schematisch dargestellt und mit 13 die vollflächige Be­schichtung mit Polydialkylsiloxan. Die Druckfarbe befin­det sich auf der Schicht aus Polydialkylsiloxan. Im rech­ten Winkel zur Heißsiegelschicht 4 erstrecken sich rechts und links von der verpackten Käsescheibe stegartige Be­reiche 6,7, in denen die zwei übereinanderliegenden Fo­lienlagen 10,11 nur durch eine dazwischen eingeschlossene äußerst dünne Käseschicht 8 aneinanderhaften. Im Bereich der Verpackung, der sich zwischen den beiden Bereichen 6 und 7 erstreckt, ist die Käseschicht wesentlich dicker, üblicherweise einige Millimeter.The single figure shows an embodiment of the packaging in perspective. A rectangular cheese slice 9 is completely encased by the closely fitting flat film 1. The overlapping edge zones 2, 3 of the film 1, which is bent in a tube shape around the cheese slice, are connected to one another in the area of the strip-shaped heat seal layer 4 made of ethylene copolymer, the heat seal layer 4 extends in the vicinity and parallel to the edge 12 of the film 1. With 5, a printed field is shown schematically shown and at 13 the full surface coating with polydialkylsiloxane. The printing ink is on the layer of polydialkylsiloxane. At right angles to the heat-sealing layer 4, web-like regions 6, 7 extend in the right and left of the packaged cheese slice, in which the two layers of film 10, 11 lying one above the other only adhere to one another through an extremely thin cheese layer 8 enclosed between them. In the area of the packaging, which extends between the two areas 6 and 7, the cheese layer is much thicker, usually a few millimeters.

Claims (3)

1. Verpackung für scheibenförmige Lebensmittel mit im wesentlichen rechteckiger Fläche, insbesondere für Käse­scheiben, bestehend aus einer gegebenenfalls bedruckten Folie, die um das zu verpackende Lebensmittel in Form eines flachliegenden Schlauchs gewickelt ist und dieses vollständig einschließt, wobei die beiden längsaxialen Randzonen der Folie sich überlappen und durch eine Heiß­siegelschicht auf der Folie miteinander verbunden sind, dadurch gekennzeichnet, daß sich die Heißsiegelschicht streifenförmig in der Nähe und parallel zu einem Rand der Folie erstreckt und im wesentlichen aus heißsiegel­fähigem Olefinmischpolymerisat besteht und daß die Folie außerhalb der Heißsiegelschicht gegebenenfalls bedruckt ist.1. Packaging for disc-shaped foodstuffs with an essentially rectangular surface, in particular for cheese slices, consisting of an optionally printed film which is wrapped around the food to be packaged in the form of a flat tube and completely encloses it, the two longitudinal axial edge zones of the film overlapping and are connected to one another by a heat seal layer on the film, characterized in that the heat seal layer extends in the form of a strip in the vicinity and parallel to an edge of the film and consists essentially of heat sealable olefin copolymer and that the film is optionally printed outside the heat seal layer. 2. Verpackung nach Anspruch 1, dadurch gekennzeichnet, daß die Verpackungsaußenseite eine Beschichtung aus einer siliziumorganischen Verbindung, vorzugsweise aus einem Polydialkylsiloxan, aufweist.2. Packaging according to claim 1, characterized in that the outside of the packaging has a coating of an organosilicon compound, preferably of a polydialkylsiloxane. 3. Verpackung nach Anspruch 1 oder 2, dadurch ge­kennzeichnet, daß die Folie aus Polyester, insbesondere Polyethylenterephthalat, oder einem Polyolefin, ins­besondere Propylenpolymeren, besteht.3. Packaging according to claim 1 or 2, characterized in that the film consists of polyester, in particular polyethylene terephthalate, or a polyolefin, in particular propylene polymer.
EP89121862A 1988-12-02 1989-11-27 Packaging for sliced food, particularly for sliced cheese Expired - Lifetime EP0372348B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8989121862T ATE105253T1 (en) 1988-12-02 1989-11-27 PACKAGING FOR SLICED FOOD, ESPECIALLY SLICED CHEESE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8815034U DE8815034U1 (en) 1988-12-02 1988-12-02 Packaging for sliced food, especially cheese slices
DE8815034U 1988-12-02
DE8908628U 1989-07-15
DE8908628U DE8908628U1 (en) 1989-07-15 1989-07-15 Packaging for sliced food, especially cheese slices

Publications (2)

Publication Number Publication Date
EP0372348A1 true EP0372348A1 (en) 1990-06-13
EP0372348B1 EP0372348B1 (en) 1994-05-04

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EP89121862A Expired - Lifetime EP0372348B1 (en) 1988-12-02 1989-11-27 Packaging for sliced food, particularly for sliced cheese

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EP (1) EP0372348B1 (en)
DE (1) DE58907611D1 (en)
DK (1) DK606689A (en)
ES (1) ES2051967T3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0553708A1 (en) * 1992-01-31 1993-08-04 Wolff Walsrode Ag Film for packages comprising slice-shaped food stuffs
EP0994812A1 (en) * 1997-12-23 2000-04-26 Wm. Wrigley Jr. Company Packaged chewing gum and methods for packaging chewing gum
WO2001010736A1 (en) * 1999-08-10 2001-02-15 Campina Melkunie B.V. - Divisie Kaas Reclosable package for cheese
NL2023278B1 (en) * 2019-06-07 2021-01-11 Berkhout Langeveld B V Packaging provided with a foodstuff and semi-finished product

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1393407A (en) * 1964-01-28 1965-03-26 Plastic packaging
DE3517795A1 (en) * 1985-05-17 1986-11-20 Hoechst Ag, 6230 Frankfurt NON-SEALABLE, BIAXIAL-ORIENTED MULTILAYER FILM FROM PROPYLENE POLYMERS, METHOD FOR PRODUCING THE FILM AND THEIR USE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1393407A (en) * 1964-01-28 1965-03-26 Plastic packaging
DE3517795A1 (en) * 1985-05-17 1986-11-20 Hoechst Ag, 6230 Frankfurt NON-SEALABLE, BIAXIAL-ORIENTED MULTILAYER FILM FROM PROPYLENE POLYMERS, METHOD FOR PRODUCING THE FILM AND THEIR USE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9330, 25. Dezember 1985; & JP-A-60 162 626 (SADAMI) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0553708A1 (en) * 1992-01-31 1993-08-04 Wolff Walsrode Ag Film for packages comprising slice-shaped food stuffs
EP0994812A1 (en) * 1997-12-23 2000-04-26 Wm. Wrigley Jr. Company Packaged chewing gum and methods for packaging chewing gum
EP0994812A4 (en) * 1997-12-23 2006-01-25 Wrigley W M Jun Co Packaged chewing gum and methods for packaging chewing gum
WO2001010736A1 (en) * 1999-08-10 2001-02-15 Campina Melkunie B.V. - Divisie Kaas Reclosable package for cheese
NL2023278B1 (en) * 2019-06-07 2021-01-11 Berkhout Langeveld B V Packaging provided with a foodstuff and semi-finished product

Also Published As

Publication number Publication date
DE58907611D1 (en) 1994-06-09
EP0372348B1 (en) 1994-05-04
DK606689A (en) 1990-06-03
ES2051967T3 (en) 1994-07-01
DK606689D0 (en) 1989-12-01

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