EP3997268B1 - Papier barrière multifonctionnel et procédé pour sa production - Google Patents

Papier barrière multifonctionnel et procédé pour sa production Download PDF

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Publication number
EP3997268B1
EP3997268B1 EP20737108.9A EP20737108A EP3997268B1 EP 3997268 B1 EP3997268 B1 EP 3997268B1 EP 20737108 A EP20737108 A EP 20737108A EP 3997268 B1 EP3997268 B1 EP 3997268B1
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EP
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Prior art keywords
barrier paper
coating
paper
copolymers
barrier
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EP20737108.9A
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German (de)
English (en)
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EP3997268A1 (fr
Inventor
Markus Kick
Thomas Kesmarszky
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Constantia Pirk GmbH and Co KG
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Constantia Pirk GmbH and Co KG
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate

Definitions

  • the present invention relates to a multifunctional barrier paper and a method for producing the same
  • PVDC polyvinylidene chloride
  • Co-extruded resins also represent a way to give papers increased impermeability to gases and (air) moisture.
  • papers are also poorly received by the market due to their unnatural feel.
  • the recyclability of paper coated in this way is limited. So far, no solution has been found to effectively prevent fiber breaks, especially in the case of Production of prefabricated bags (pouch-making) with side gussets or flow pack packaging with side gussets.
  • the present invention is therefore based on the object of providing a barrier paper which, on the one hand, has a high level of impermeability to gases and (air) moisture, but on the other hand is also easy to process and dispose of. Furthermore, it is desirable to provide a packaging which does not have the disadvantages presented above.
  • a barrier paper according to the invention therefore has a carrier comprising a paper, which has a coating at least in sections on a first side and on a second side opposite the first side, the coatings differing on the two opposite sides.
  • the barrier paper has an oxygen transport rate (OTR, Oxygen Transfer Rate) of ⁇ 10 cm 3 /m 2 •d•bar (DIN 53380-3) and a water vapor permeability (MVTR, Moisture Vapor Transmission Rate) ⁇ 15 g/m 2 •d (ISO 15106-3).
  • OTR oxygen transport rate
  • MVTR Water vapor permeability
  • At least the first coating on the first side includes a polyurethane (PU) lacquer.
  • At least the second coating arranged on the second side comprises, in sections, a sealing layer that can be activated using the cold or hot sealing process.
  • This sealing layer is in particular a thermally activated sealing layer and/or a cold sealing coating.
  • cold seal coating optionally arranged on the second side
  • a cold sealing lacquer represents a particularly preferred embodiment of a cold sealing coating. If the advantages of a cold sealing lacquer compared to a cold sealing coating are not explicitly stated, the terms “cold sealing coating” and “cold sealing lacquer” will therefore be used synonymously in the description of the present invention.
  • a sealing layer is understood to be a layer that can be sealed with another layer and/or against itself. In particular, such a sealing layer is therefore suitable for forming at least temporary adhesion to another layer and/or itself.
  • such a barrier paper does not have the disadvantages described above. Due to the coating with a polyurethane varnish, it has a pleasant feel. The PU varnish can optionally be applied thinly so that the feel of the paper is retained. Nevertheless, such a barrier paper has the required properties in terms of low oxygen transport rate and water vapor permeability. In addition, easy processing is possible, especially in the packaging industry, on conventional machines without causing fiber breaks in the paper.
  • the thermally activated sealing layer or cold seal coating allows sections of the barrier paper to be easily connected to other packaging components or another section of the same or a different barrier paper.
  • the polyurethane varnish is preferably water-based. This is advantageous in terms of handling, storage, emissions and disposal.
  • the paper of the carrier has a basis weight in the range of 40 - 200 g/m 2 , preferably in the range of 80 - 150 g/m 2 , particularly preferably in the range of 85 - 110 g/m 2 .
  • Basis weights from this range have proven to be particularly suitable.
  • these barrier papers are easy to process (especially with conventional machines) and inexpensive, but on the other hand they also have a pleasant feel, a high-quality impression and the necessary strength to ensure tear resistance, rigidity and high impermeability to gases and (air) moisture to offer.
  • Such papers are easy to print (for example with solvent-based gravure and flexographic printing inks), for which standard machines can also be used without leaving unacceptably high residual solvent contents in the paper.
  • the ink adheres permanently to the paper so that the desired visual impression, which is particularly important in the packaging industry for the recognition of a branded product, can be guaranteed and is permanently retained.
  • lacquers known from the prior art can also be used.
  • a so-called adhesive lacquer can optionally be applied to the side of the paper opposite the cold sealing lacquer, for example using the gravure printing process with a layer thickness of preferably approx. 1 ⁇ m.
  • the paper of the carrier has at least one calendered surface, preferably with a high fiber density. What is particularly advantageous is that the gloss and smoothness of the paper are increased.
  • the paper is calendered at a temperature in the range between 150 and 250 ° C, preferably between 180 and 230 ° C, particularly preferably between 200 and 220 ° C.
  • the paper is calendered at a pressure in the range between 200 and 50,000 ° kPas, preferably between 300 and 30,000 ° kPas, particularly preferably between 1,000 and 50,000 ° kPas. Papers that are calendered in this way have proven to be particularly advantageous because, on the one hand, they have the desired ink absorption and feel, but on the other hand, they can also bind the additional surface coating sufficiently firmly and permanently.
  • the lacquer of the first coating comprises the polyurethane in semicrystalline form on the first side.
  • the paint can be thermally reworked using such a semicrystalline polyurethane, for example additionally hardened. This can offer a variety of advantages, for example improving the feel or visual appearance (e.g. gloss or reflectivity) or further reducing the oxygen transport rate and water vapor permeability, which can be advantageous for the storage stability of the product wrapped in such barrier paper, particularly in the packaging industry can.
  • the first coating on the first side further comprises a polyvinyl alcohol, which is preferably present as a homo- or co-polymer.
  • the coating on the first side comprises an ethylene-vinyl laurate-alcohol copolymer.
  • the first coating comprises a polymer coating consisting of isoprene, styrene-isoprene, styrene-ethylene-butadiene latices, styrene-ethylene-propylene latices, styrene-butadiene latices and/or (alkylated/A -rylated) acrylate and/or (alkylated/arylated) styrene-acrylate copolymers and/or olefin copolymers and/or ethylene-vinyl acetate copolymers or mixtures thereof.
  • the first and/or second coating is at least partially spaced from the carrier by an intermediate layer.
  • the intermediate layer comprises a dispersion of alkylated ketene dimers and/or vinylsilane derivatives of different molecular weights, or mixtures thereof.
  • the first coating on the first side additionally or alternatively comprises at least one polymer which is selected from a group comprising one or more copolymers of a polyester and aliphatic epoxides, one or more copolymers of an (alkylated/arylated) Acrylate and aliphatic epoxides, one or more homo- or co-polymers of polyvinylpyrolidone, one or more cycloolefin copolymers (COC), particularly preferably based on norbornene polymers (COP) or based on norbornene-ethylene copolymers (COC), (partly or fully hydrogenated), polyamides, cellulose derivatives, one or more soluble polycarbonate copolymers individually or in a combination of several of the polymers included in the group and preferably a crosslinking component from the group of isocyanates, amines, anhydrides, oxazolines, azeridines, reactive silanes, dicar
  • the (co)polymers contained in this group have shown that they are particularly suitable for providing the paper of the carrier with the properties desired for the barrier paper.
  • the sealability, the feel and the low oxygen transport rate and the water vapor permeability can be influenced advantageously.
  • the first and/or second coating contains inorganic solids.
  • Alumina-based solids and/or layered silicates are particularly preferred.
  • the first coating contains mica particles. Surprisingly, it has been shown that these inorganic particles are particularly advantageous for reducing water vapor permeability.
  • the barrier paper has at least 10% pigment volume concentration in the coating of such an inorganic solid. It has been shown that a particularly high oxygen and water vapor barrier can be achieved with this amount of inorganic solid.
  • the carrier or (carrier) paper is provided with a primer.
  • the primer is applied as a (not necessarily closed) layer - preferably directly - to the carrier and the first coating is only arranged over it.
  • Particularly preferred amounts of primer - regardless of the arrangement - are 0.5 - 5 g/m 2 , preferably 1 - 4 g/m 2 , preferably 1.5 - 3 g/m 2 , particularly preferably about 2 g/m 2 has proven to be advantageous, particularly in terms of effect and cost efficiency.
  • the quantities mentioned above refer to the dry weight of the primer, regardless of the method of application. To simplify homogeneous application, it would be conceivable, in particular, to soak in a solution or suspension of the primer or to brush or spray on such a solution or suspension.
  • primer compositions which comprise substances which are selected individually or in a combination of several substances from a group comprising one or more homo- or co-polymers polyvinyl alcohols, one or more ethylene-vinyl laurate-alcohol copolymers, one or more homo - or co-polymers of polyvinylpyrolidone, one or more copolymers of a polyester and an aliphatic epoxide, one or more copolymers of an (alkylated/arylated) acrylate and an aliphatic epoxide, one or more (alkylated/arylated) acrylates, polyamides, cellulose derivatives or comprises several cross-linked polyurethanes.
  • the (co-)polymers contained in this group have shown that they are particularly suitable as primers for positively influencing, in particular reducing, the oxygen transport rate and water vapor permeability in barrier paper.
  • the barrier paper has a second coating on the second side, which provides a heat sealing property. It is therefore particularly preferred that this coating enables the thermally activated sealing of the barrier paper.
  • An embodiment in which the coating on the second side comprises a heat sealing lacquer has proven to be particularly advantageous, particularly for simple processing in the packaging industry.
  • An amount of the second coating on the second side of the barrier paper is preferred in a range of 2 - 30 g/m 2 , preferably 5 - 20 g/m 2 , preferably 8 - 15 g/m 2 , particularly preferably about 10 g/m 2 . These amounts have proven to be particularly advantageous, on the one hand to ensure or support the required water vapor and oxygen tightness, but on the other hand also to provide sufficient strength of a sealing layer and/or to shield a product wrapped in the barrier paper from the other components of the barrier paper to ensure.
  • the second coating on the second side of a barrier paper comprises a polyolefin-containing lacquer.
  • lacquers in particular lacquers containing low-density polyethylene (LDPE) or LDPE-like lacquers ("LDPE-like lacquer", which are to be understood in particular in the sense of lacquers containing polyethylene co/terpolymers), are due to their Sealability and the possibility of processing them with conventional machines are preferred.
  • a cold sealing lacquer preferably based on natural latex, is applied to the heat sealing lacquer described above or to the paper surface itself, at least partially and particularly preferably using the gravure printing process.
  • Suitable application quantities are 1 - 10 g/m 2 , preferably 2 - 5 g/m 2 , particularly preferably approx. 4 g/m 2 dry application weight.
  • the second coating on the second side of barrier paper in the sealed state has an adhesive force relative to itself and/or another layer of identical barrier paper, which is at least 1.5 N/15 mm, preferably at least 3 N/15 mm, particularly preferably at least 5 N/15 mm.
  • a sealed state is understood to mean a state in which at least a second coating on the second side of a barrier paper has been thermally activated and has been connected to a section of a barrier paper. The thermal activation preferably takes place at a temperature of at least 80°C, preferably at least 90°C, preferably at least 100°C.
  • the strength achieved is preferably so high that a tensile load on the barrier paper leads to tearing of the paper backing of the barrier paper and the sealed contact point of the barrier paper sections remains intact.
  • sealing is preferably carried out at room temperature with a sealing pressure of at least 2 bar.
  • the adhesive force against itself is at least 1.5N/15mm.
  • the second coating on the second side of a barrier paper is a hydroxyl-functionalized, acrylate-containing copolymer.
  • the impermeability to individual or a variety of flavors and/or fats can be reduced additionally or alternatively by silica, which is contained in the second coating on the second side of the barrier paper.
  • the amount of silica which is preferably present as particles of an average particle size (d 50 , Sedigraph) in the range of 0.1 - 30 ⁇ m, is in the range of 1 - 20 g/m 2 , preferably 2 - 10 g/m 2 , in particular preferably from about 3 - 5 g/m 2 , shown to be particularly advantageous with regard to aroma sealing in packaging.
  • the second coating on the second side of a barrier paper in the sealed state has an adhesive force relative to itself and/or another layer of identical barrier paper which is at most 7 N /15 mm, preferably at most 5 N/15 mm, particularly preferably at most 3 N/15 mm.
  • a sealed state is also understood to mean a state in which at least a second coating on the second side of a barrier paper has been thermally activated and has been connected to a section of a barrier paper.
  • the thermal activation here also preferably takes place at a temperature of at least 80 ° C, preferably at least 90 ° C, preferably at least 100 ° C or via cold sealing with activation of the applied cold sealing lacquer by means of pressure applied to the barrier paper at room temperature.
  • An at least locally low adhesive force is particularly advantageous if sections are provided in a packaging which are easy for the user to access to the product enclosed in the packaging.
  • Such packaging is, for example, chips or candy bags, which should be easy to open by a user, but should not lose their properties as a bag. The destruction of sections of the packaging away from the intended opening section(s) is therefore undesirable.
  • the second coating on the second side of the barrier paper preferably comprises an ethylene-methacrylic acid copolymer.
  • Particularly preferred are amounts in the range from 2 to 20 g/m 2 , preferably from 3 to 10 g/m 2 , preferably from 4 to 7 g/m 2 , particularly preferably from about 5 g/m 2 in particular in relation to low sealing strength and the cost efficiency due to the high solids content of the paint that can be achieved have proven to be advantageous.
  • the quantities mentioned above refer to the dry weight of the coating, regardless of the type of application (for example brushing or spraying on a solution, dispersion or suspension containing such a copolymer).
  • This layer preferably comprises an inorganic solid.
  • this layer contains clay, talc or silica. Surprisingly, it has been shown that these inorganic particles are advantageous, particularly for reducing the aroma permeability of the barrier paper.
  • the amount of the layer comprising these particles which preferably have an average particle size (d 50 , Sedigraph) in the range of 0.1 - 30 ⁇ m, is in the range of 1 - 20 g/m 2 , preferably 2 - 10 g/m 2 , particularly preferred of about 3 - 7 g/m 2 , in particular about 5 g/m 2 , have proven to be particularly advantageous with regard to aroma sealing in packaging.
  • the additional layer is arranged on the second side of the barrier paper between the carrier and the coating described above on the second side of the barrier paper. Accordingly, it is not absolutely necessary that the coating on the second side of the barrier paper contacts the carrier (over its entire surface). It is possible and advantageous for some applications for a further layer to be arranged at least in sections between the coating on the second side of the barrier paper and the carrier.
  • the additional layer can preferably be thermally activated and thus preferably - like the second coating on the second side of the barrier paper - be part of a thermally activated sealing layer. This can also be painted over an applied printing ink.
  • the breakage and/or tear resistance of the carrier is increased.
  • polyurethanes and/or polyamides are particularly suitable for this purpose. These are preferably applied to the carrier of the barrier paper, particularly preferably in solution, dispersion or suspension as a lacquer on the carrier surface(s). Regardless of the choice of polymers, it is particularly preferred that the polymers are applied to both sides of the carrier. The polymers can penetrate into the paper thanks to the porosity of the carrier and strengthen the cross-linking of the paper fibers.
  • the lacquer film on the paper surface physically counteracts paper tears during the packaging process by mechanically building up counterforces when the paper is subjected to tensile stress.
  • the polymers can also prevent the breakage of paper fibers and/or reduce the number of breaks that occur under stress. This is particularly advantageous in the (machine) treatment of the barrier paper, since strong local mechanical loads can occur during the packaging process or the production of bags, for example.
  • quantities of the polymer have been in the range of 0.5 - 20 g/m 2 , preferably 1 - 10 g/m 2 has proven to be advantageous. These quantities refer to the dry weight of the polymer.
  • the barrier paper it is provided that it has a self-sealing (cold-seal) layer on one side at least in sections.
  • This cold seal layer is preferably arranged on the second side of the barrier paper. This can be achieved, for example, by an (additional) cold-seal coating, in particular a cold-seal varnish. This is advantageous, for example, if the barrier paper is used for flow pack packaging, especially for packaging chocolate.
  • the cold-seal varnish covers at least sections of a heat-seal varnish with a layer thickness of, for example, 2 ⁇ m.
  • the barrier paper it is provided that it has a surface coating of reduced adhesive strength on one side at least in sections.
  • This surface coating is preferably arranged on the first side of the barrier paper. This can be achieved, for example, by an (additional) anti-blocking and/or anti-ticling (or non-stick) coating. This is advantageous, for example, in order to avoid the undesirable sticking of a cold seal coating to sections of the barrier paper.
  • the anti-blocking and/or non-stick coating at least partially covers the coating on the first side of the barrier paper.
  • the application amounts are preferably chosen so that they form a layer thickness of 0.01 to 0.2 micrometers, preferably 0.02 to 0.1 micrometers. To apply such a coating, including on paper substrates, a high vacuum process is preferred.
  • the barrier paper in a further preferred embodiment of the barrier paper, it can be designed as a laminate.
  • several of the barrier papers described above can be glued together, for example to form a duplex structure. This is for example advantageous if stronger, more stable or higher-quality packaging is desired.
  • a barrier paper laminate does not necessarily have to have all of the above-mentioned coatings (multiple times).
  • the carrier itself is a laminate and this laminate has one of the coatings described above on one side as a carrier.
  • a laminate of several papers is advantageous for this.
  • These papers can have identical or different properties.
  • it is preferred that at least two layers of paper are glued together at least in sections, preferably using at least one polymer. Casein-based and/or synthetic adhesives have proven to be particularly advantageous as polymers. Bonding is preferably carried out using wet or dry lamination processes.
  • Such a method is characterized in that a carrier comprising paper is provided, which is provided with a coating at least in sections on a first side and on a second side opposite the first side, the coatings differing on the two opposite sides .
  • a thermally activated second coating preferably a sealing layer, is applied at least on the second side and a first coating comprising a semicrystalline polyurethane (PU) lacquer is applied at least on the first side.
  • PU semicrystalline polyurethane
  • the amounts of these coatings are selected so that after these coatings have dried, the barrier paper has an oxygen transport rate (OTR, Oxygen Transfer Rate) of ⁇ 10 cm 3 /m 2 •d•bar, measured at 23 ° C / 75% ambient humidity and a water vapor permeability (MVTR, Moisture Vapor Transmission Rate) ⁇ 15 g/m 2 •d, measured at 23°C/85% and 0% (on the sensor side) of ambient humidity.
  • OTR oxygen transport rate
  • MVTR Moisture Vapor Transmission Rate
  • the application of the first coating containing the polyurethane paint can, on the one hand, make a decisive difference Contribution to the reduction of the oxygen transport rate and the water vapor permeability can be made, but in addition the pleasant feel of a (packaging) product manufactured using this process, which is desired in the packaging industry, can be achieved.
  • the thickness of the first and second coatings can be chosen variably and in particular the PU lacquer of the first coating can be applied so thin that the feel of the paper is retained.
  • the thermally activated sealing layer or the second coating enables sections of the barrier paper to be easily connected to other packaging components or another section of the same or a different barrier paper.
  • the paper of the carrier is provided with a basis weight in the range of 40 - 200 g/m 2 , preferably in the range of 80 - 150 g/m 2 , particularly preferably in the range of 85 - 110 g/m 2 , since basis weights vary from have shown themselves to be particularly suitable in this area in terms of the required strength and resilience on the one hand, ease of processing (especially with conventional machines) and low costs on the other.
  • such a barrier paper is printed with an optically recognizable pattern at least on the first side with respect to the carrier. This can be done before, during or after applying the PU paint.
  • the visually recognizable color adheres permanently to the paper - especially when it is arranged between the carrier and the PU varnish - so that the desired visual impression, which is particularly important in the packaging industry for the recognition of a branded product, can be guaranteed in the long term.
  • the barrier paper is arranged at least in sections around a product to be packaged and then the thermally activated sealing layer is activated in order to cover sections of the barrier paper with the product or other sections of the packaging (if necessary from sections of the same barrier paper).
  • This process variant enables packaging to be closed particularly easily.
  • the barrier paper is subjected to at least one cutting process.
  • the barrier paper can be adjusted to the dimensions of a product to be packaged.
  • This at least one cutting process can take place (independently of any further cutting processes) before or after (sectionally) enclosing the product to be packaged.
  • an endless tube of the barrier paper is closed on one side by thermal activation and is separated from the rest of the tube by a cutting process and then a product is filled into the tube section closed on one side. The tube could then be cut off on the still open side of the packaging and then closed.
  • Fig. 1 shows a schematic representation of a barrier paper 1 according to the invention.
  • This barrier paper 1 has a carrier 2, which has two opposite sides 3 and 4. Each of these sides has a coating 5, 6, these coatings 5, 6 being different.
  • a second coating 6 is preferably suitable for forming a thermally activated connection to a surface of another barrier paper or the same barrier paper 1.
  • At least one of the coatings 5, 6 is selected such that the barrier paper 1 has an oxygen transport rate (OTR, Oxygen Transfer rate) of ⁇ 10 cm 3 /m 2 •d•bar and a water vapor permeability (MVTR, Moisture Vapor Transmission Rate) ⁇ 15 g/m 2 •d.
  • OTR oxygen transport rate
  • MVTR Water vapor permeability
  • At least the first coating 5 arranged on the first side 3 comprises a polyurethane varnish.
  • one or more additional layers may be present in the barrier paper.
  • coatings can be, for example, a release varnish, a color mixture, primer, and/or metallization.
  • Such layers can be present (independently of each other) over the entire surface or only in sections. Layers that are applied, for example, as part of a surface pretreatment of the carrier are particularly advantageous. These can be used, for example, to reduce porosity. Regardless, for some applications it may be advantageous to use a primer which can be arranged (independently) on the first and/or second side of the support.
  • a layer is a full-surface heat sealing lacquer, a partial heat sealing lacquer or a partial cold sealing lacquer.
  • a release varnish is arranged on the side of the first coating facing away from the carrier.
  • Fig. 2 shows an application example for a barrier paper 1 as described above.
  • the barrier paper 1 is formed into a packaging bag 7.
  • at least sections 8 of the second coating 6 of the barrier paper 1 have been activated and sealed against other sections of the barrier paper 1.
  • the adhesion forces occurring in the sealing area 8 are sufficient to protect a product (not shown) contained in such a packaging 7 over a longer period of time, which preferably extends over one to several weeks, against at least a selection of environmental influences that are harmful to the product.
  • Such packaging 7 is particularly suitable for food, which on the one hand should be protected from harmful environmental influences, but the packaging 7 should also be easy to open without damaging the product. It would be conceivable, for example, to use such packaging 7 for confectionery, such as caramel or chewy sweets.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)

Claims (14)

  1. Papier barrière (1) avec un support (2) comprenant un papier, lequel présente, sur un premier côté (3) et sur un deuxième côté (4) faisant face au premier côté, respectivement au moins par endroits un revêtement (5, 6), dans lequel les revêtements (5, 6) sont différents sur les deux côtés se faisant face (3, 4),
    caractérisé en ce que
    le papier barrière présente un taux de transport d'oxygène selon la norme DIN 53380-3 ≤ 10 cm3/m2·d·bar et une perméabilité à la vapeur d'eau selon la norme ISO 15106-3 ≤ 15 g/m2·d et au moins le premier revêtement (5) comprend sur le premier côté (3) un vernis polyuréthane et au moins le deuxième revêtement (6) disposé sur le deuxième côté (4) comprend au moins par endroits une couche de scellement pouvant être activée dans le procédé de scellement à froid ou à chaud.
  2. Papier barrière selon la revendication 1,
    caractérisé en ce que
    le papier du support présente une masse par unité de surface dans la plage de 40 - 200 g/m2, de manière préférée dans la plage de 80 - 150 g/m2, en particulier de manière préférée dans la plage de 85 - 110 g/m2.
  3. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le premier revêtement comprend le polyuréthane sous une forme semi-cristalline.
  4. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la couche de scellement comprend un revêtement polymère constitué de latex d'isoprène, de latex de styrène-isoprène, de latex de styrène, de latex de styrène-éthylène-butadiène, de latex de styrène-éthylène-propylène, de latex de styrène-butadiène et/ou de copolymères d'acrylate (alkylés/arylés) et/ou de copolymères de styrène-acrylate (alkylés/arylés) et/ou de copolymères oléfiniques et/ou de copolymères d'éthylène-acétate de vinyle ou de mélanges de ceux-ci.
  5. Papier de barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le premier et/ou le deuxième revêtement sont espacés du support au moins par endroits par une couche intermédiaire, dans lequel la couche intermédiaire comprend de manière préférée une dispersion composée de dimères de cétène alkylés et/ou de dérivés de vinylsilane à poids moléculaires différents, ou des mélanges de ceux-ci.
  6. Papier de barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le premier revêtement comprend au moins un polymère, lequel est choisi parmi un groupe comprenant au moins un alcool polyvinylique, lequel est présent de manière préférée en tant qu'un homo- ou copolymère, un copolymère d'éthylène-laurate de vinyle-alcool, un ou plusieurs copolymères d'un polyester et d'époxydes aliphatiques, un ou plusieurs copolymères d'un acrylate (alkylé/arylé) et d'époxydes aliphatiques, un ou plusieurs homo- ou copolymères de la polyvinylpyrrolidone, un ou plusieurs copolymères de cyclooléfine (COC), en particulier de manière préférée à base de polymères de norbornène (COP) et de manière préférée à base de copolymères de norbornène-éthylène (COC), (en partie ou en totalité hydratés), des polyamides, des dérivés de cellulose, un ou plusieurs copolymères de polycarbonate solubles individuellement ou dans une combinaison de plusieurs polymères contenus dans le groupe et de manière préférée un composant de réticulation issu du groupe des isocyanates, des amines, des anhydrides, des oxazolines, des silanes réactifs aux aziridines, des acides dicarboxyliques.
  7. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le premier et/ou le deuxième revêtement contiennent des matières solides inorganiques, de manière préférée des matières solides à base d'argile et/ou des silicates lamellaires, en particulier de manière préférée des particules de mica, dans lequel les matières solides inorganiques sont présentent en une quantité d'au moins 10 % de la concentration du volume de pigments dans le revêtement.
  8. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le support présente sur son premier et/ou deuxième côté un apprêt, lequel est contenu de manière préférée en une quantité en poids sec de 0,5 - 5 g/m2, de manière préférée de 1 - 4 g/m2, de manière préférée de 1,5 - 3 g/m2, en particulier de manière préférée d'environ 2 g/m2 dans le papier barrière.
  9. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'apprêt comprend au moins une substance, qui est choisie individuellement ou dans une combinaison de plusieurs substances issues d'un groupe, qui comprend un ou plusieurs homo- ou copolymères, des alcools polyvinyliques, un ou plusieurs copolymères d'éthylène-laurate de vinyle-alcool, un ou plusieurs homo- ou copolymères de la polyvinylpyrrolidone, un ou plusieurs copolymères d'un polyester et d'un époxyde aliphatique, un ou plusieurs copolymères d'un acrylate (alkylé/arylé) et d'un époxyde aliphatique, un ou plusieurs acrylates (alkylés/arylés), des polyamides, des dérivés de cellulose ou un ou plusieurs polyuréthanes réticulés.
  10. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le deuxième revêtement (6) est présent sur le deuxième côté (4) du papier barrière (1) dans une plage de quantités de 2 - 30 g/m2, de manière préférée de 5 - 20 g/m2, de manière préférée de 8 - 15 g/m2, en particulier de manière préférée d'environ 10 g/m2.
  11. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le deuxième revêtement présente, sur le deuxième côté du papier barrière, dans l'état scellé, une force d'adhérence par rapport à lui-même et/ou à une autre couche d'un papier barrière identique, laquelle est d'au moins 1,5 N/15 mm, de manière préférée d'au moins 3 N/15 mm, de manière particulièrement préférée d'au moins 5 N/15 mm.
  12. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    celui-ci comprend au moins une autre couche, laquelle comprend de l'oxyde d'aluminium et/ou de l'oxyde de silicium ou de l'aluminium et est constituée de manière préférée d'oxyde d'aluminium ou d'oxyde de silicium ou d'aluminium.
  13. Papier barrière selon au moins l'une quelconque des revendications précédentes,
    caractérisé en ce que
    celui-ci est relié à au moins un autre papier et/ou à lui-même, de manière préférée au moyen d'une colle humide ou sèche, en un aggloméré en papier.
  14. Procédé de fabrication d'un papier barrière (1), lequel présente un taux de transport d'oxygène selon la norme DIN 53380-3 ≤ 10 cm3/m2·d·bar et une perméabilité à la vapeur d'eau selon la norme ISO 15106-3 ≤ 15 g/m2·d,
    caractérisé en ce que
    est fourni un support (2) comprenant du papier, lequel est pourvu respectivement au moins par endroits d'un revêtement (5, 6) sur un premier côté (3) et sur un deuxième côté (4) opposé au premier côté, dans lequel les revêtements se différencient sur les deux côtés opposés, dans lequel un deuxième revêtement (6) pouvant être activé thermiquement est appliqué au moins sur le deuxième côté (4) et un premier revêtement (5) comprenant un vernis polyuréthane est appliqué au moins sur le premier côté (3), puis ces revêtements sont séchés.
EP20737108.9A 2019-07-08 2020-06-26 Papier barrière multifonctionnel et procédé pour sa production Active EP3997268B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019118425.8A DE102019118425A1 (de) 2019-07-08 2019-07-08 Multifunktionales Barrierepapier und Verfahren zu dessen Herstellung
PCT/EP2020/068170 WO2021004818A1 (fr) 2019-07-08 2020-06-26 Papier barrière multifonction et procédé pour la fabrication de celui-ci

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AU2020393881B2 (en) 2019-11-29 2025-10-23 Selig Sealing Products, Inc. Foil free tabbed seal
US12377630B2 (en) 2020-05-29 2025-08-05 Selig Sealing Products, Inc. Dispensing liner
DE102022103957A1 (de) * 2022-02-18 2023-08-24 Constantia Pirk Gmbh & Co. Kg Verbund zum Verpacken von Nahrungsmitteln und Verfahren zu dessen Herstellung
DE102022106886A1 (de) 2022-03-23 2023-09-28 delsci GmbH Verpackungsmaterial für lebensmittel mit innenliegender barriereschicht
EP4411064A1 (fr) 2023-02-06 2024-08-07 Huhtamäki Oyj Procédé de formation d'un récipient ouvert pour produits laitiers, aliments à base de plantes et/ou aliments congelés
DE102023103298A1 (de) 2023-02-10 2024-08-14 Huhtamaki Flexible Packaging Germany Gmbh & Co. Kg Metallisiertes papierbasiertes Verpackungslagenmaterial mit wenigstens zwei Barriereschichten aus einem Vinylalkohol-Polymer
DE102024109020A1 (de) * 2024-03-28 2025-10-02 Mayr-Melnhof Karton Ag Verfahren zum Herstellen eines beschichteten Verpackungsmaterials

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WO2021004818A1 (fr) 2021-01-14
EP3997268A1 (fr) 2022-05-18
ES2972543T3 (es) 2024-06-13
DE102019118425A1 (de) 2021-01-14

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