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WO2007032719A1 - Bande d’étanchéité et récipient d’emballage comprenant une telle bande - Google Patents

Bande d’étanchéité et récipient d’emballage comprenant une telle bande Download PDF

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Publication number
WO2007032719A1
WO2007032719A1 PCT/SE2006/000991 SE2006000991W WO2007032719A1 WO 2007032719 A1 WO2007032719 A1 WO 2007032719A1 SE 2006000991 W SE2006000991 W SE 2006000991W WO 2007032719 A1 WO2007032719 A1 WO 2007032719A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyethylene
layer
sealing
sealing strip
density
Prior art date
Application number
PCT/SE2006/000991
Other languages
English (en)
Inventor
Ingemar Larsson
Monika Zuppiger
André CHIQUET
Fabrizio Parmiggiani
Roberto Dondi
Original Assignee
Tetra Laval Holdings & Finance S.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Publication of WO2007032719A1 publication Critical patent/WO2007032719A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/74—Auxiliary operations
    • B31B50/742—Coating; Impregnating; Waterproofing; Decoating
    • B31B50/743—Coating or impregnating edges or corners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/04—Applying separate sealing or securing members, e.g. clips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/308—Heat stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2329/00—Polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals
    • B32B2329/04—Polyvinylalcohol
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2377/00—Polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the present invention relates to a laminated sealing strip for packaging purposes, comprising a core or bulk layer and outer, liquid-tight layers of thermoplastic, preferably polyethylene.
  • the present invention also relates to a packaging container in which incision edges of the packaging material are covered by means of the laminated sealing strip.
  • Packaging containers for liquid foods are produced with the aid of modern, rational filling machines which, either from a web or from prefabricated sheets of a packaging laminate, form, fill and seal the packages.
  • parallelepipedic packaging containers of the Tetra Brik type are produced in that the web is first reformed into a tube by both opposing longitudinal edges of the web being folded towards and, by thermosealing, permanently united to one another in a liquid-tight overlap joint.
  • the tube is filled with the pertinent contents, for example milk, at the same time as the tube is divided into continuous, filled cushion-shaped packaging units by repeated flat-pressing operations and sealings of the tube in transverse sealing zones across the longitudinal direction of the tube below the level of the contents in the tube.
  • the packaging units are separated from one another by incisions in the transverse sealing zones and are given the desired geometric configuration, usually parallelepipedic, by inward folding and fixing of the double-walled triangular corner flaps against each respective adjacent planar packaging wall or panel.
  • the finished packaging containers are thereafter discharged from the filling machine for further transport and handling.
  • a conventional packaging container of the above-described type is produced from a laminated packaging material comprising a rigid, but foldable, core or bulk layer of paper or paperboard and outer, liquid-tight coatings of thermoplastic, preferably polyethylene.
  • the packaging material moreover includes at least one additional layer by means of which the requisite tightness properties against oxygen are ensured.
  • Examples of materials for such additional layers may be ethyl vinyl alcohol (EVOH), polyamide (PA), polyethylene terephthalate (PET), etc., but use is preferably made of an aluminium foil with the aid of which thermosealing by means of induction sealing is made possible during the production of the packages.
  • EVOH ethyl vinyl alcohol
  • PA polyamide
  • PET polyethylene terephthalate
  • the requisite edge protection may be realised in different manners and by different means, normally with the aid of a sealing strip of the type described by way of introduction, separately applied over the incision edge on the inside of the tube.
  • such a sealing strip is applied and fixed in a filling machine along the one longitudinal edge of the packaging material web so that it has a free strip edge projecting from the longitudinal edge.
  • the planar packaging material web provided with the strip is then reformed into a tube in that, as was described above, both of the longitudinal edges of the web are folded towards and permanently united to one another in an overlap seal or joint.
  • the projecting free strip edge is folded into planar abutment against the overlapping inside of the second longitudinal web edge and is fixedly sealed thereto by thermosealing in such a manner that the incision edge of the first longitudinal web edge facing towards the interior of the tube is completely covered and protected against liquid penetration (edge wicking).
  • the projecting free edge strip may be folded completely around the incision edge of the first longitudinal web edge into planar abutment against the other side (the outside) of the first longitudinal web edge, against which it is fixed prior to the reforming of the web into a tube. Both of the longitudinal edges of the web are then folded, as in the previous case, towards one another and permanently united with one another in an overlap joint by thermosealing.
  • the sealing strip is applied using one or the other of the above-described methods, it is of course important in both cases that the entire strip application and edge covering procedure may be carried out in such a manner that the requisite protection against liquid penetration in the incision edge facing towards the inside of the packaging container is ensured as a result of the applied sealing strip.
  • the sealing strip must thus be thermosealable to counterfacing sealing surfaces of the packaging material and an additional requirement is that the thermosealing must be capable of being carried out in an efficient and expedient manner even at the extremely high production output speeds at which today's modern filling machines operate. This requirement is particularly important in the production of so-called aseptic packaging containers in which a packed food is intended to be able to be reliably stored for extremely long storage times, without either the packaging container or the food packed in the packaging container being damaged and becoming unusable.
  • One prior art sealing strip that is employed in a commercial packaging container of a packaging material comprising a paper- or paperboard layer and outer liquid-tight coatings of polyethylene, preferably low density polyethylene (LDPE) has a base layer of polyethylene terephthalate (PET) and outer, thermosealable plastic coatings of polyethylene, for example low density polyethylene (LDPE).
  • LDPE low density polyethylene
  • Another prior art sealing strip for a commercial packaging material of the above- described type has a base layer of polyethylene terephthalate (PET) and outer, thermosealable plastic coatings of metallocene polyethylene (mLLDPE) which, in comparison with low density polyethylene (LDPE) displays an advantageously wider sealing window than LDPE with a lower temperature limit that lies below the corresponding limit for LDPE.
  • PET polyethylene terephthalate
  • mLLDPE metallocene polyethylene
  • the advantage inherent in the latter sealing strip is that, as a result of its wider sealing window, it makes for a more reliable fixing of the sealing strip over a wider sealing temperature range and that it is hence less sensitive to temperature fluctuations that may occur during the normal operation of a filling machine.
  • the lower downward sealing temperature limit moreover makes for a more rapid sealing process than the former strip and thus contributes to increased production output speeds.
  • the harmful thermal effect on the projecting strip edge may even be so severe that the projecting strip edge shows a tendency to be bent back (i.e. above 90 degrees) over the fixedly sealed strip portion, whereby a later downward folding into planar abutment against the counterfacing sealing surface of the second web edge becomes impossible.
  • the longitudinal incision edge on the inside of the packaging container will be completely unprotected against edge wicking within areas where the free edge strip has been folded back over itself.
  • One object of the present invention is therefore to realise such a thermally stable sealing strip for packaging purposes.
  • Another object of the present invention is to realise a packaging container for liquid food in which the longitudinal incision edge of the packaging container on the inside is protected with the aid of a sealing strip according to the present invention.
  • the sealing strip comprises a base layer of a polymer possessing gas barrier properties which, on its one side, has a first sealing layer of polyethylene and, on its other side, has a second sealing layer of polyethylene, at least one of said first and second sealing layers having an average density which is greater than or equal to the density of metallocene polyethylene (mLLDPE), i.e. greater than 0.928.
  • mLLDPE metallocene polyethylene
  • the first sealing layer has, on the one side of the base layer, a two layer structure consisting of an outer layer of a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE) and an inner layer of a mixture of low density polyethylene (LDPE) and a density-increasing polyethylene component.
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • LDPE low density polyethylene
  • LDPE low density polyethylene
  • the second sealing layer on the other side of the base layer may also display a two layer structure consisting of an outer layer of a mixture of metallocene polyethylene (mLLDPE), low density polyethylene (LDPE) and an inner layer of a mixture of low density polyethylene (LDPE) and a density- increasing polyethylene component.
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • LDPE low density polyethylene
  • the first sealing layer has, on the one side of the base layer, a two layer structure consisting of an outer layer of a mixture of metallocene polyethylene (mLLDPE), low density polyethylene (LDPE) and a density-increasing polyethylene component, and an inner layer of a low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • LDPE density-increasing polyethylene component
  • the second sealing layer on the other side of the base layer may also display a two layer structure consisting of an outer layer of a mixture of metallocene polyethylene (mLLDPE), low density polyethylene (LDPE) and a density-increasing polyethylene component, and an inner layer of a low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • LDPE density-increasing polyethylene component
  • Examples of density-increasing polyethylene components for use in the sealing strip according to the present invention may be any polyethylene component whatever which, in mixture with the other present polymer component or components in the two sealing layers, has a capacity to increase the average density in each respective layer to a level which is equal to or above the density level of the same layer without the presence of the density-increasing polyethylene component.
  • An optimum density-increasing polyethylene component for use in the sealing strip according to the present invention has the ability to raise the pertinent density level to a value that is higher than the density of metallocene polyethylene (mLLDPE) but still lower than the density of low density polyethylene (LDPE) in order to make for a thermosealing of a sealing strip at a sealing temperature which is at least somewhat lower than the melting point of low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • MDPE and HDPE medium and high density polyethylene
  • LMDPE linear medium density polyethylene
  • the base layer in the sealing strip suitably consists of a polymer which, on the one hand, displays superior tightness properties to gases, in particular oxygen gas, and, on the other hand, displays a sufficient thermal stability and mechanical strength to withstand thermal and mechanical stresses to which the sealing strip is exposed on application on a packaging material web in a filling machine.
  • Typical examples of usable polymers that fulfil these requirements are polyesters (PET, PEN, PBT), biaxially oriented polyesters (BOPET, BOPEN) 1 polyamide (PA), oriented polyamide (OPA, BOPA), ethylene vinyl alcohol copolymer (EVOH), biaxially oriented ethylene vinyl alcohol copolymer (BOEVOH), biaxially oriented cyclic olefin polymers (BOCOC, BOCOP) .
  • PET polyesters
  • PEN polyBT
  • BOPET, BOPEN biaxially oriented polyesters
  • PA polyamide
  • OPA oriented polyamide
  • EVOH ethylene vinyl alcohol copolymer
  • BOEVOH biaxially oriented ethylene vinyl alcohol copolymer
  • BOCOC, BOCOP biaxially oriented cyclic olefin polymers
  • a packaging container for liquid food preferably a so-called aseptic packaging container, in which free incision edges on the inside of the packaging container are covered by a sealing strip according to the present invention applied over the incision edge.
  • Fig.1 is a schematic cross section of a sealing strip according to a first embodiment of the present invention
  • Fig. 2 is a schematic cross section of a sealing strip according to a modification of the embodiment shown in Fig. 1 ;
  • Fig. 3 is a schematic cross section of a sealing strip according to a second embodiment of the present invention.
  • Fig. 4 is a schematic cross section of a sealing strip according to a modification of the embodiment shown in Fig. 3;
  • Fig. 5 is a schematic view of a packaging material web provided with a sealing strip according to the present invention and in the process of being reformed into a tube.
  • Fig. 1 is thus a schematic cross section of a sealing strip according to a first embodiment of the present invention.
  • the sealing strip has been given the generic reference numeral 10 and displays a central core or base layer 11 which, on one side, has a first sealing layer 12 and, on its other side, a second sealing layer 13.
  • the first sealing layer 12 displays a two layer structure consisting of an outer layer 12a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 12b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • the second sealing layer 13 also displays a two layer structure consisting of an outer layer 13a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 13b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • At least one of the sealing layers 12 and 13 is supplemented with a density-increasing polyethylene component.
  • the density-increasing polyethylene component is incorporated in the outer layer 12a of the first sealing layer 12.
  • Examples of usable density-increasing polyethylene components may, as was mentioned previously, be medium and high density polyethylene (MDPE and HDPE) and linear medium density polyethylene (LMDPE).
  • MDPE and HDPE medium and high density polyethylene
  • LMDPE linear medium density polyethylene
  • the choice of density-increasing polyethylene component is not critical to the present invention, as long as the selected component is used in a sufficient quantity to ensure that the average density of the outer polyethylene layer 12a of the first sealing layer 12 is higher than the density of the same layer without the presence of the density-increasing polyethylene component.
  • the requisite quantity of the density-increasing polyethylene component may thus readily be determined from case to case by a person skilled in the art in possession of the knowledge of the additional polyethylene component or components that are included in the pertinent layer 12a.
  • the base layer should preferably consist of a polymer which, on the one hand, displays superior tightness properties to gases, in particular oxygen gas, and, on the other hand, displays a sufficient thermal stability and mechanical strength to withstand thermal and mechanical stresses to which the sealing strip is exposed on application on a packaging material web in a filling machine.
  • polyesters PET, PEN, PBT
  • biaxially oriented polyesters BOPET, BOPEN
  • PA polyamide
  • OPA oriented polyamide
  • EVOH ethylene vinyl alcohol copolymer
  • BOEVOH biaxially oriented ethylene vinyl alcohol copolymer
  • BOCOC biaxially oriented cyclic olefin polymers
  • a further requirement that is placed on a well-functioning sealing strip for the purposes of the present invention is naturally that it should have integrity and superior internal cohesion between the layers included in the strip and thus not delaminate or otherwise be damaged or destroyed when it is exposed to external tensile and stretching stresses during the application on a packaging material web under the prevailing external conditions in a filling machine.
  • the base layer may therefore - in certain cases - be appropriate or even necessary to subject, for purposes of increasing bonding and adhesion, the base layer to a surface treatment by means of which adhesion to adjacent layers in the sealing strip is improved.
  • the base layer may, prior to lamination to the remaining layers, be treated with adhesion-promoting primer or lacquer well-known to the skilled reader of this specification.
  • Fig. 2 is a schematic cross section of a sealing strip according to a modification of the sealing strip illustrated in Fig. 1.
  • the sealing strip carrying the generic reference numeral 20 in Fig. 2 is a base layer 21 which, on its one side, has a first sealing layer 22 and on its other side a second sealing layer 23.
  • the first sealing layer 22 displays a two layer structure consisting of an outer layer 22a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 22b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • the second sealing layer 23 also displays in this embodiment a two layer structure consisting of an outer layer 23a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 23b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • At least one of the sealing layers 22 and 23 is supplemented with a density-increasing polyethylene component which, in the illustrated example, is assumed to be incorporated in the inner layer 22b of the first sealing layer 22.
  • Examples of usable density-increasing polyethylene components may, as was mentioned previously, be medium and high density polyethylene (MDPE and HDPE), and linear medium density polyethylene (LMDPE).
  • MDPE and HDPE medium and high density polyethylene
  • LMDPE linear medium density polyethylene
  • the choice of density-increasing polyethylene component is not critical to the present invention, as long as the selected component is used in a sufficient quantity to ensure that the average density of the inner polyethylene layer 22b of the first sealing layer 22 is higher than the density of the same layer without the presence of the density-increasing polyethylene component.
  • the requisite quantity of the density-increasing polyethylene component may thus readily be determined from case to case by a person skilled in the art in possession of the knowledge of the additional polyethylene component or components that are included in the pertinent layer 22b.
  • the base layer 21 should preferably consist of a polymer which, on the one hand, displays superior tightness properties to gases, in particular oxygen gas, and, on the other hand, displays a sufficient thermal stability and mechanical strength to withstand thermal and mechanical stresses to which the sealing strip is exposed on application on a packaging material web in a filling machine.
  • a polymer which, on the one hand, displays superior tightness properties to gases, in particular oxygen gas, and, on the other hand, displays a sufficient thermal stability and mechanical strength to withstand thermal and mechanical stresses to which the sealing strip is exposed on application on a packaging material web in a filling machine.
  • Examples of usable polymers that fulfil these requirements are polyesters (PET, PEN, PBT), biaxially oriented polyesters (BOPET, BOPEN), polyamide (PA), oriented polyamide (OPA, BOPA), ethylene vinyl alcohol copolymer (EVOH), biaxially oriented ethylene vinyl alcohol copolymer (BOEVOH), biaxially oriented cyclic olefin polymers (BOCOC
  • a further requirement that is placed on a well-functioning sealing strip for the purposes of the present invention is naturally that it should have integrity and superior internal cohesion between the layers included in the strip and thus not delaminate or otherwise be damaged or destroyed when it is exposed to external tensile and stretching stresses during the application on a packaging material web under the prevailing external conditions in a filling machine.
  • the base layer may therefore - in certain cases - be appropriate or even necessary to subject, for purposes of increasing bonding and adhesion, the base layer to a surface treatment by means of which adhesion to adjacent layers in the sealing strip is improved.
  • the base layer may, prior to lamination to the remaining layers, be treated with adhesion-promoting primer or lacquer well-known to the skilled reader of this specification.
  • Fig. 3 is a schematic cross section of a sealing strip according to a first embodiment of the present invention.
  • the sealing strip which has been given the generic reference numeral 30, has a central base layer 31 which, on its one side, has a first sealing layer 32 and on its other side a second sealing layer 33.
  • the first sealing layer 32 displays a two layer structure consisting of an outer layer 32a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 32b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • the second sealing layer 33 also displays a two layer structure consisting of an outer layer 33a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 33b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • At least one of the sealing layers 32 and 33 is supplemented with a density-increasing polyethylene component.
  • the density-increasing polyethylene component is incorporated in the outer layer 33a of the second sealing layer 33.
  • Examples of usable density-increasing polyethylene components may, as was mentioned previously, be medium and high density polyethylene (MDPE and HDPE), and linear medium density polyethylene (LMDPE).
  • MDPE and HDPE medium and high density polyethylene
  • LMDPE linear medium density polyethylene
  • the choice of density-increasing polyethylene component is not critical to the present invention, as long as the selected component is used in a sufficient quantity to ensure that the average density of the outer polyethylene layer 33a of the second sealing layer 33 is higher than the density of the same layer without the presence of the density-increasing polyethylene component.
  • the requisite quantity of the density-increasing polyethylene component may thus readily be determined from case to case by a person skilled in the art in possession of the knowledge of the additional polyethylene component or components that are included in the pertinent layer 33a.
  • the base layer should preferably consist of a polymer which, on the one hand, displays superior tightness properties to gases, in particular oxygen gas, and, on the other hand, displays a sufficient thermal stability and mechanical strength to withstand thermal and mechanical stresses to which the sealing strip is exposed on application on a packaging material web in a filling machine.
  • polyesters PET, PEN, PBT
  • biaxially oriented polyesters BOPET, BOPEN
  • PA polyamide
  • OPA oriented polyamide
  • EVOH ethylene vinyl alcohol copolymer
  • BOEVOH biaxially oriented ethylene vinyl alcohol copolymer
  • BOCOC 1 BOCOP biaxially oriented cyclic olefin polymers
  • a further requirement that is placed on a well-functioning sealing strip for the purposes of the present invention is naturally that it should have integrity and superior internal cohesion between the layers included in the strip and thus not delaminate or otherwise be damaged or destroyed when it is exposed to external tensile and stretching stresses during the application on a packaging material web under the prevailing external conditions in a filling machine.
  • the base layer may therefore - in certain cases - be appropriate or even necessary to subject, for purposes of increasing bonding and adhesion, the base layer to a surface treatment by means of which adhesion to adjacent layers in the sealing strip is improved.
  • the base layer may, prior to lamination to the remaining layers, be treated with adhesion-promoting primer or lacquer well-known to the skilled reader of this specification.
  • Fig. 4 is a schematic cross section of a sealing strip according to a modification of the sealing strip illustrated in Fig. 3.
  • the sealing strip which has been given the generic reference numeral 40 in Fig. 4, has a central base layer 41 which, on its one side, has a first sealing layer 42 and on its other side a second sealing layer 43.
  • the first sealing layer 42 displays a two layer structure consisting of an outer layer 42a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 42b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • the second sealing layer 43 also displays in this embodiment a two layer structure consisting of an outer layer 43a of polyethylene, preferably a mixture of metallocene polyethylene (mLLDPE) and low density polyethylene (LDPE), and an inner layer 43b of polyethylene, preferably low density polyethylene (LDPE).
  • mLLDPE metallocene polyethylene
  • LDPE low density polyethylene
  • at least one of the sealing layers 42 and 43 is supplemented with a density-increasing polyethylene component which, in the illustrated example, is assumed to be incorporated in the inner layer 43b of the second sealing layer 43.
  • Examples of usable density-increasing polyethylene components may, as was mentioned previously, be medium and high density polyethylene (MDPE and HDPE), and linear medium density polyethylene (LMDPE).
  • MDPE and HDPE medium and high density polyethylene
  • LMDPE linear medium density polyethylene
  • the choice of density-increasing polyethylene component is not critical to the present invention, as long as the selected component is used in a sufficient quantity to ensure that the average density of the inner polyethylene layer 43b of the second sealing layer 43 is higher than the density of the same layer without the presence of the density-increasing polyethylene component.
  • the requisite quantity of the density-increasing polyethylene component may thus readily be determined from case to case by a person skilled in the art in possession of the knowledge of the additional polyethylene component or components that are included in the pertinent layer 43b.
  • the base layer 41 should preferably consist of a polymer which, on the one hand, displays superior tightness properties to gases, in particular oxygen gas, and, on the other hand, displays a sufficient thermal stability and mechanical strength to withstand thermal and mechanical stresses to which the sealing strip is exposed on application on a packaging material web in a filling machine.
  • polyesters PET, PEN, PBT
  • biaxially oriented polyesters BOPET, BOPEN
  • PA polyamide
  • OPA oriented polyamide
  • EVOH ethylene vinyl alcohol copolymer
  • BOEVOH biaxially oriented ethylene vinyl alcohol copolymer
  • BOCOC 1 BOCOP biaxially oriented cyclic olefin polymers
  • a further requirement that is placed on a well-functioning sealing strip for the purposes of the present invention is naturally that it should have integrity and superior internal cohesion between the layers included in the strip and thus not delaminate or otherwise be damaged or destroyed when it is exposed to external tensile and stretching stresses during the application on a packaging material web under the prevailing external conditions in a filling machine.
  • the base layer may therefore - in certain cases - be appropriate or even necessary to subject, for purposes of increasing bonding and adhesion, the base layer to a surface treatment by means of which adhesion to adjacent layers in the sealing strip is improved.
  • the base layer may, prior to lamination to the remaining layers, be treated with adhesion-promoting primer or lacquer well-known to the skilled reader of this specification.
  • Fig. 5 schematically illustrates a phase in which a packaging material web of paper with outer, liquid-tight coatings of polyethylene, for example low density polyethylene (LDPE) or a mixture of low density polyethylene (LDPE) and metallocene polyethylene (mLLDPE) is reformed in a filling machine into a tube in the production of liquid-tight, preferably aseptic packaging containers.
  • LDPE low density polyethylene
  • LDPE low density polyethylene
  • mLLDPE metallocene polyethylene
  • the sealing strip in Fig. 5 may be any one whatever of the previously described sealing strips according to the present invention and, for the purposes of clarity, in the illustrated example the relevant sealing strip has been given the same reference numeral as the sealing strip 10 in Fig. 1.
  • the sealing strip 10 is applied on and sealed to the one longitudinal edge (the right-hand edge in the figure) of the web so that the sealing strip 10, in this stage of the tube formation, has a strip edge 10' freely projecting over the first web edge and which, after the sealing of both of the longitudinal web edges, is intended to urge against and, in planar abutment, be sealed to the inside of the overlapping second longitudinal web edge in order to cover completely and protect the inwardly facing liquid-wicking incision edge of paper or paperboard against liquid penetration (edge wicking).
  • a sealing strip according to the present invention is intended to be employed as protection against liquid penetration in liquid-wicking incision edges on the inside of conventional packaging containers for liquid foods such as, for example, milk, juice, cooking oils or wine etc.
  • the sealing strip is intended to be employed as protection against such liquid penetration in conventional, well-known packaging containers of the Tetra Brik, Tetra Wedge, Tetra Prisma types (all registered trademarks), which all share the common feature that they are produced by packing and filling machines which, from a web of packaging material of plastic coated paper or paperboard, form, fill and seal aseptic packages in a continuous production process at extremely high production output speeds, such as from 15,000 and up to 20,000 packages per hour and even more.
  • a sealing strip according to the invention may display first and second sealing layers in which the density-increasing polymer component is simultaneously present, even though the density-increasing polyethylene component in the described and illustrated embodiments is only present in one of the two outer sealing layers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

La présente invention concerne une bande d’étanchéité stratifiée (10) servant dans les emballages, ladite bande d'étanchéité (10) comportant sur un côté une première couche d'étanchéité (12) de polyéthylène et sur l'autre côté une seconde couche d'étanchéité (13) de polyéthylène. Afin de conférer à la bande d’étanchéité (10) suffisamment de stabilité à la chaleur pour supporter l’impact de températures temporairement augmentées pendant l’opération d’étanchéification, sans que la bande se ride ou se rétracte, au moins l’une desdites couches d’étanchéité (12 ; 13)comprend également un composant augmentant la densité du polyéthylène constitué de préférence de polyéthylène à moyenne densité (MDPE), de polyéthylène à haute densité (HDPE) ou de polyéthylène à moyenne densité linéaire (LMDPE). Fig. 1
PCT/SE2006/000991 2005-09-15 2006-08-30 Bande d’étanchéité et récipient d’emballage comprenant une telle bande WO2007032719A1 (fr)

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SE0502031-8 2005-09-15
SE0502031A SE529099C2 (sv) 2005-09-15 2005-09-15 Förseglingsremsa samt en förpackningsbehållare innefattande en sådan remsa

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216382A1 (fr) * 2009-02-02 2010-08-11 Tredegar Film Products Corporation Film de masquage aux propriétés de mouillage améliorées
CN103043299A (zh) * 2012-12-31 2013-04-17 吴壮 一种包装容器
CN103042731A (zh) * 2012-12-31 2013-04-17 吴壮 一种包装容器
CN103042799A (zh) * 2012-12-31 2013-04-17 吴壮 一种制造层压包装材料的方法
CN103043300A (zh) * 2012-12-31 2013-04-17 吴壮 一种包装容器
CN103085366A (zh) * 2012-12-31 2013-05-08 台州市珠叶机械科技有限公司 一种层压包装材料
US20140079868A1 (en) * 2012-04-05 2014-03-20 Anheuser-Busch, Llc Packaging for decarbonated beer base liquid
CN104760355A (zh) * 2012-12-31 2015-07-08 台州市珠叶机械科技有限公司 一种层压包装材料
CN104760382A (zh) * 2012-12-31 2015-07-08 台州市珠叶机械科技有限公司 一种层压包装材料
CN105015120A (zh) * 2015-08-19 2015-11-04 浙江金石包装有限公司 一种高透明聚乙烯薄膜及其制备方法
US9265278B2 (en) 2013-06-24 2016-02-23 Anheuser-Busch, Llc Methods for decarbonating fermented liquids
WO2017072121A1 (fr) * 2015-10-29 2017-05-04 Tetra Laval Holdings & Finance S.A. Film de barrière stratifié et bande de recouvrement de bord pour emballage
CN110179268A (zh) * 2019-05-28 2019-08-30 东莞市灏睿建材有限公司 一种封边条及其制备工艺
WO2025019243A1 (fr) * 2023-07-14 2025-01-23 Smart Planet Technologies, Inc. Procédé et composition fournissant une barrière à l'alcool améliorée pour des applications d'emballage en papier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998026994A1 (fr) * 1996-12-19 1998-06-25 Tetra Laval Holdings & Finance S.A. Lamine d'emballage, son procede de fabrication et conteneurs d'emballage
SE524525C2 (sv) * 2003-02-28 2004-08-24 Tetra Laval Holdings & Finance Förpackningslaminat och förpackningsbehållare som framställts från detta

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998026994A1 (fr) * 1996-12-19 1998-06-25 Tetra Laval Holdings & Finance S.A. Lamine d'emballage, son procede de fabrication et conteneurs d'emballage
SE524525C2 (sv) * 2003-02-28 2004-08-24 Tetra Laval Holdings & Finance Förpackningslaminat och förpackningsbehållare som framställts från detta

Cited By (26)

* Cited by examiner, † Cited by third party
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JP2010174239A (ja) * 2009-02-02 2010-08-12 Tredegar Film Products Corp 濡れ性が向上したマスキングフィルム
EP2216382A1 (fr) * 2009-02-02 2010-08-11 Tredegar Film Products Corporation Film de masquage aux propriétés de mouillage améliorées
TWI448387B (zh) * 2009-02-02 2014-08-11 Tredegar Film Prod Corp 具有經改良之濕潤性的罩膜
US20140079868A1 (en) * 2012-04-05 2014-03-20 Anheuser-Busch, Llc Packaging for decarbonated beer base liquid
US10280388B2 (en) 2012-04-05 2019-05-07 Anheuser-Busch, Llc Systems and methods for customized fermented beverages
US9803163B2 (en) 2012-04-05 2017-10-31 Anheuser-Busch Llc Systems for carbonating customized beverages
US20150086681A1 (en) * 2012-04-05 2015-03-26 Anheuser-Busch, Llc Systems and methods for customized fermented beverages
CN103043300B (zh) * 2012-12-31 2015-04-22 台州市珠叶机械科技有限公司 一种包装容器
CN104760385A (zh) * 2012-12-31 2015-07-08 台州市珠叶机械科技有限公司 一种包装容器
CN103043300A (zh) * 2012-12-31 2013-04-17 吴壮 一种包装容器
CN103085366B (zh) * 2012-12-31 2015-04-08 台州市珠叶机械科技有限公司 一种层压包装材料
CN103042731B (zh) * 2012-12-31 2015-04-08 台州市珠叶机械科技有限公司 一种包装容器
CN103042799A (zh) * 2012-12-31 2013-04-17 吴壮 一种制造层压包装材料的方法
CN103043299B (zh) * 2012-12-31 2015-05-20 台州市珠叶机械科技有限公司 一种包装容器
CN104760355A (zh) * 2012-12-31 2015-07-08 台州市珠叶机械科技有限公司 一种层压包装材料
CN104760358A (zh) * 2012-12-31 2015-07-08 台州市珠叶机械科技有限公司 一种包装容器
CN103085366A (zh) * 2012-12-31 2013-05-08 台州市珠叶机械科技有限公司 一种层压包装材料
CN104760382A (zh) * 2012-12-31 2015-07-08 台州市珠叶机械科技有限公司 一种层压包装材料
CN103043299A (zh) * 2012-12-31 2013-04-17 吴壮 一种包装容器
CN103042731A (zh) * 2012-12-31 2013-04-17 吴壮 一种包装容器
US9265278B2 (en) 2013-06-24 2016-02-23 Anheuser-Busch, Llc Methods for decarbonating fermented liquids
CN105015120A (zh) * 2015-08-19 2015-11-04 浙江金石包装有限公司 一种高透明聚乙烯薄膜及其制备方法
WO2017072121A1 (fr) * 2015-10-29 2017-05-04 Tetra Laval Holdings & Finance S.A. Film de barrière stratifié et bande de recouvrement de bord pour emballage
US10889092B2 (en) 2015-10-29 2021-01-12 Tetra Laval Holdings & Finance S.A. Laminated barrier film and edge-covering strip for packaging
CN110179268A (zh) * 2019-05-28 2019-08-30 东莞市灏睿建材有限公司 一种封边条及其制备工艺
WO2025019243A1 (fr) * 2023-07-14 2025-01-23 Smart Planet Technologies, Inc. Procédé et composition fournissant une barrière à l'alcool améliorée pour des applications d'emballage en papier

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SE529099C2 (sv) 2007-05-02

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