EP4198198A1 - Stratifié pour couvrir des récipients - Google Patents

Stratifié pour couvrir des récipients Download PDF

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Publication number
EP4198198A1
EP4198198A1 EP22212534.6A EP22212534A EP4198198A1 EP 4198198 A1 EP4198198 A1 EP 4198198A1 EP 22212534 A EP22212534 A EP 22212534A EP 4198198 A1 EP4198198 A1 EP 4198198A1
Authority
EP
European Patent Office
Prior art keywords
methods
layer
backing paper
paper
particularly preferably
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.)
Pending
Application number
EP22212534.6A
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German (de)
English (en)
Inventor
Tobias Stein
Markus Kick
Gerald Griessler
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.)
Constantia Pirk GmbH and Co KG
Original Assignee
Constantia Pirk GmbH and Co KG
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 Constantia Pirk GmbH and Co KG filed Critical Constantia Pirk GmbH and Co KG
Publication of EP4198198A1 publication Critical patent/EP4198198A1/fr
Pending legal-status Critical Current

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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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • 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
    • D21H19/10—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
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • 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
    • 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
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents

Definitions

  • the present invention relates to a coated carrier paper, in particular as a covering element for covering containers.
  • a coated carrier paper in particular as a covering element for covering containers. Due to the problem of sorting containers and in particular cups with liddings (covers) in the recycling process, attempts have recently been made to use aluminum-free materials for the liddings. In addition, such covers should be sustainable. Covers which contain paper are therefore already known from the prior art. Such covers with paper (as a carrier) also contain a plastic layer, which was extruded, for example. These covers often have a bad flatness, which is reflected in particular in separating problems during packaging at the packaging plants. In addition, these structures can later lead to problems in the repulping process due to the high proportion of plastic, which means that such cover materials are difficult to recycle.
  • the present invention is therefore based on the object of providing a laminate and in particular a cover for containers and optionally a container to which the cover material is applied, which on the one hand is recyclable and on the other hand, if possible, does not use aluminum or extruded plastics. but the requirement for the minimum shelf life of the filling material is met.
  • a layer composition according to the invention and in particular a coated carrier paper according to the invention, in particular for covering containers, has a carrier which has a first surface and a second surface opposite the first surface (whereby preferably both the first surface and the second surface have at least one further layer and preferably in each case at least two further layers are arranged one above the other) wherein the carrier has a cellulose-containing material, in particular a kraft paper, and wherein at least one overprint varnish layer is applied to the first surface.
  • an overprint varnish layer is to be understood in particular as a varnish for protecting the printing ink and/or the paper surface and/or the surface of an already precoated paper.
  • At least one barrier lacquer layer and one sealing lacquer layer are arranged on at least the second surface, which preferably forms the side of the carrier paper that faces the filling material.
  • the sealing wax layer is not designed to be firmly connected and/or firmly sealed to the container. This means in particular that the sealing wax layer can be pulled off the container (i.e. in particular that the container can be peeled off.
  • the backing paper and/or the covering material is sealed to a container, such as in particular a beaker, cup, tray or the like, but in particular is releasably sealed.
  • the container is particularly preferably a paper container, in particular made of coated paper, such as in particular but not exclusively a paper cup.
  • the barrier lacquer layer is preferably applied within the sealing lacquer layer relative to the carrier or the sealing lacquer layer is arranged further outside relative to the barrier lacquer layer.
  • the barrier lacquer layer is therefore preferably arranged between the carrier and the sealing lacquer layer.
  • the sealing lacquer layer is a heat-sealing lacquer.
  • This heat-sealing lacquer or the heat-sealing lacquer layer particularly preferably represents an external layer in relation to the coated carrier paper.
  • a primer or the printing ink can optionally be provided or applied between the carrier and the overprint lacquer layer.
  • the barrier lacquer layer is a barrier lacquer and in particular a barrier lacquer which reduces the WVTR (Water Vapor Transmission Rate) of the cover.
  • a barrier coating preferably prevents or reduces the passage of water or atmospheric moisture through the coated carrier paper.
  • water, humidity or water vapor can penetrate one or more layers of the coated carrier paper, namely until they reach the barrier coating.
  • this barrier lacquer layer is preferably arranged on a surface facing towards the interior of the container.
  • the carrier particularly preferably consists of paper, in particular kraft paper, or of cardboard and/or essentially contains paper.
  • the carrier has a grammage of between 40 g/m 2 and 200 g/m 2 , preferably between 50 g/m 2 and 160 g/m 2 and particularly preferably between 60 g/m 2 and 110 g / m 2 lies.
  • the overprint varnish layer has a dry grammage in the range of 0.1 g/m 2 - 10 g/m 2 , preferably 1 g/m 2 - 8 g/m 2 , particularly preferably 2 g/m 2 - 5 g/m 2 lies.
  • the overprint varnish layer has a wet basis weight in the range of 0.25 g/m 2 - 25 g/m 2 , preferably 2.5 g/m 2 - 20 g/m 2 and particularly preferably 5 g/m 2 m 2 - 12.5 g/m 2 .
  • this wet grammage or the overprint varnish is applied as an aqueous emulsion or as a dispersion.
  • the overprint varnish layer is an outer layer of the coated base paper. In a state arranged on the container, this overprint varnish layer is preferably directed outwards.
  • the overprint varnish layer has at least one material which is selected from a group of materials which styrene acrylate and in particular a styrene acrylate emulsion, acrylate and in particular an acrylate emulsion, olefinic wax dispersions and other additives such as in particular Contains defoamers or crosslinking agents.
  • the composition of the overprint varnish layer particularly preferably contains several and particularly preferably all of these components.
  • a glass transition temperature of the overprint lacquer layer is preferably at least 90.degree. When the glass transition temperature Tg is exceeded, a solid glass or polymer changes to a rubbery to viscous state.
  • the overprint varnish layer is heat-resistant up to at least 300°C. This can be checked, for example, using flat sealing jaws with a sealing time of 1 second and a pressure of 2.35 bar.
  • a Brugger sealing device with steel jaws can preferably be used here.
  • the overprint varnish layer is preferably water-repellent.
  • the overprint lacquer layer is particularly preferably a dried lacquer layer, hot air drying being carried out at a maximum of 110° C. in particular.
  • This overprint varnish layer preferably has a predetermined adhesion to printing inks (for example printing inks based on nitrocellulose).
  • printing inks for example printing inks based on nitrocellulose.
  • Printing processes from the prior art are preferably used for printing, for example gravure printing, flexographic printing, offset printing or digital printing.
  • the pressure and/or the printing processes used for this pressure preferably have a Heat press resistance of at least 200 ° C, wherein preferably an additional application of a primer is provided on at least one of the surfaces.
  • This primer application serves in particular to improve adhesion on paper.
  • the primer can preferably be a polyurethane dispersion.
  • the barrier lacquer layer has a dry basis weight in the range of 1 g/m 2 - 25 g/m 2 , preferably 4 g/m 2 - 20 g/m 2 and particularly preferably 5 g/m 2 - 8 g/m 2 , this barrier layer particularly preferably being composed of at least two layers or sub-layers (in particular arranged directly one on top of the other). These two sub-layers particularly preferably have a grammage of between 1 g/m 2 and 3 g/m 2 , preferably around 2 g/m 2 .
  • the barrier lacquer layer contains an ionomer and preferably consists of an ionomer or ionomers.
  • This ionomer is preferably a metallic salt of an ethylene-methacrylic acid copolymer. This substance has good oil and water resistance and is preferably applied from an aqueous dispersion.
  • the barrier lacquer layer contains further fillers such as clay.
  • this dispersion is made without an emulsifier (because an emulsifier can reduce water resistance).
  • fillers to be introduced into the dispersion, such as clay, advantageously with a high aspect ratio.
  • This is preferably a silicate, preferably a sheet silicate and/or a sodium aluminum silicate or mixtures thereof. Montmorillonite or kaolin, in particular from the group of the so-called “hyperplaty kaolins", is also preferred.
  • the filler content in the paint is preferably up to 50%. Such an ionomer coating has very good repulping properties.
  • the barrier lacquer layer has a solids content in the range of 20%-45%.
  • the barrier lacquer layer preferably has a tensile strength in the range of 14-35 MPa.
  • the elongation at break of the barrier lacquer layer is in the range of 340%-450% and in a further preferred embodiment the barrier lacquer layer has a softening point in the range of 55°C-65°C.
  • the barrier lacquer layer particularly preferably has the abovementioned properties at least in part and preferably completely in combination. Such a layer has proven to be particularly suitable for the coated base paper according to the invention. The properties mentioned above are preferred, i. H. the tensile strength at break and the elongation at break and also the softening point (Vicat) determined according to JISK 6760.
  • the barrier lacquer layer thus has a tensile strength in the range of 14-35 MPa and/or an elongation at break in the range of 340%-450% and/or a softening point in the range of 55°C-65°C.
  • This layer can be applied in different ways. A smooth rolling of this layer is possible, the use of an air knife process, a screen cylinder imprint, in particular via gravure printing, or also a curtain coating process.
  • the layer can also be sprayed on, applied by means of a size press method, for example by means of a squeegee, smoothing/smoothing squeegee.
  • a blade coater (use of a stiff and bend blade) can also be considered, as well as a film pressing process.
  • the carrier consists of a kraft paper and preferably contains long fibers, or of a paper precoated with acrylate. These papers have proven to be particularly suitable for the coated base paper described here and also for achieving recyclability. It is preferably an uncoated, coated, softcalendered and/or supercalendered kraft paper, which is particularly preferably sized.
  • a ratio between the tensile strength in the machine direction and the transverse direction is preferably between 1.3 and 2.8, particularly preferably between 1.4 and 2.2. In order to achieve this ratio, it is advantageous to equip the paper machine with a breast roll shaker.
  • the carrier has a filler content of between 0.1% and 25%, preferably between 2% and 20% and particularly preferably between 8% and 16%.
  • the carrier has a grammage of between 40 g/m 2 and 200 g/m 2 , preferably between 50 g/m 2 and 160 g/m 2 and particularly preferably between 60 g/m 2 and 110 g/m 2 lies.
  • Energy absorption in the tensile test (measured at a peeling speed of 50 mm/min, in particular measured according to ISO 1924-3) in the machine direction is preferably between 120 J/m 2 and 180 J/m 2 , preferably between 140 J/m 2 and 160 J/ m2 .
  • Energy absorption in the transverse direction (TD) tensile test is particularly preferably between 70 J/m 2 and 110 J/m 2 , preferably between 80 J/m 2 and 100 J/m 2 .
  • the backing particularly preferably has a tear strength in the machine direction (MD) of at least 250 mN, preferably at least 275 mN, particularly preferably at least 320 mN and/or a tear strength in the transverse direction (TD) of at least 200 mN, preferably at least 220 mN, particularly preferably at least 250 mN.
  • MD machine direction
  • TD transverse direction
  • the tearability is preferably measured according to ISO 1974, in particular at a paper weight of 62 g/m 2 .
  • the carrier has a relatively high specific volume, which is preferably between 0.5 m 3 /kg and 2.0 m 3 /kg, preferably between 0.7 m 3 /kg and 1.5 m 3 /kg and most preferably between 1.0 m 3 /kg and 1.2 m 3 /kg.
  • This comparatively high specific volume has also proven to be advantageous for the structure of the coated backing paper according to the invention.
  • the carrier which (independently or additionally of the other features) preferably comprises a kraft paper or an acrylate-coated paper, has a Cobb value of between 2 and 35, particularly preferably between 5 and 30 and particularly preferably between 6 and 15 and more preferably between 8 and 12.
  • This Cobb value is particularly preferably given on both surfaces or on both sides of the carrier.
  • the Cobb value provides information about the water absorption capacity of paper and solid board or corrugated board. this value is of great importance when calculating the stability to be expected.
  • the backing has a high pick resistance, which can be attributed in particular to a starch treatment.
  • the backing's high tear resistance prevents the paper fibers from tearing out during the printing process.
  • a moisture content of the carrier is particularly preferably between 2% and 10%, preferably between 3% and 8%, preferably between 4% and 6% and particularly preferably between 4.5% and 5.5%.
  • the backing has a length differential at the breaking point that is greater than 2% in both the machine and cross directions.
  • the carrier preferably has an (optical) density that is greater than 0.4.
  • the optical density is particularly preferably comparable with a white-pigmented PET film with a thickness of 50 ⁇ m.
  • the carrier particularly preferably has an E module which is between 1,500 MPa and 8,000 MPa.
  • the carrier additionally or alternatively has an energy absorption during the tensile test which is at least 70 J/m 2 measured according to ISO 1924-3.
  • a wet strength of the backing is less than 20, preferably less than 15 and particularly preferably less than 10.
  • the coated carrier paper has at least one further lacquer layer which is arranged in particular between the carrier and the print.
  • This further lacquer layer can in particular be a lacquer which reduces the oxygen permeability of the cover ("oxygen transfer rate" OTR lacquer) which, in addition or as an alternative to this, particularly preferably has a dry grammage of between 0.1 g/m 2 and 10 g/m 2 , preferably between 0.5 g/m 2 and 5 g/m 2 and more preferably between 1 g/m 2 and 4 g/m 2 .
  • OTR paint is often also referred to as an oxygen barrier paint.
  • this lacquer layer can have additional fillers, such as clay and/or crosslinking agents (such as, for example, isocyanate-based crosslinkers).
  • This lacquer layer can generally be applied at different positions, but preferably not on the sealing lacquer layer or the overprint lacquer layer.
  • the coated carrier paper has at least one, preferably two, more preferably three, possibly also four or more layer(s) selected from a group of layers which have a metallization layer, in particular with a premetallization primer, i.e. a Primer that is applied below the metallization, at least one primer/post-metallization primer, ie a primer that is applied above the metallization, and contains a further oxygen barrier lacquer layer. Structures without an oxygen barrier lacquer layer are therefore also possible.
  • This further layer is particularly preferably arranged on the side of the second surface of the carrier, for example the underside.
  • a metallization layer is arranged at least on the first surface of the carrier or on the second surface of the carrier.
  • a metallization layer is particularly preferably arranged both on the side of the first surface (top side) of the carrier and on the side of the second surface (bottom side) of the carrier.
  • the at least one metallization layer is preferred and the optionally two metallization layers are preferably arranged directly on the carrier.
  • metallization layers and primers can also be applied.
  • these metallization layers and primers can also be applied in stacks on at least one side of the carrier and preferably on both sides of the carrier.
  • An oxygen barrier lacquer can also be used instead of or in addition to the primer.
  • a lacquer layer and in particular an OTR lacquer layer is preferably both on the upper side and on the lower side of the carrier arranged.
  • the oxygen barrier lacquer layer is arranged directly on the metallization layer.
  • the coated carrier paper has at least one and preferably several primer layers, preferably at least two primer layers and preferably at least three primer layers.
  • this primer layer or these primer layers can be arranged on the second side or surface of the carrier.
  • the above-mentioned lacquer or lacquer layer or oxygen barrier lacquer layer is arranged between two primer layers.
  • the above-mentioned barrier lacquer layer is arranged between two primer layers.
  • the coated carrier paper has at least four layers, preferably at least five layers and preferably at least six layers. In a further preferred embodiment, the coated carrier paper has at most 14 layers, preferably at most 13 layers and particularly preferably at most 12 layers.
  • the barrier coatings particularly preferably have high water and/or grease resistance and particularly preferably meet the food law specifications for fatty fillings. Furthermore, these barrier coatings can also reduce the permeability of fats, oils and flavorings.
  • the sealing lacquer layer or the heat-sealing lacquer has a dry grammage of between 1 g/m 2 and 15 g/m 2 , preferably between 2 g/m 2 and 10 g/m 2 , particularly preferably between 2.5 g/m 2 and 4.5 g/m 2 .
  • the sealing wax layer has a solids content of between 10% and 60%, preferably between 15% and 55% and particularly preferably between 20% and 45%. This solids content is particularly preferably applied from a solvent-containing mixture.
  • the sealing wax layer has very good peelability or peelability compared to a container that includes a material that is selected from a group that includes APET (amorphous polyethylene terephthalate), PETG (glycol-modified polyethylene terephthalate), PS (polystyrene), PP (polypropylene), and PLA (polylactic acid).
  • APET amorphous polyethylene terephthalate
  • PETG glycocol-modified polyethylene terephthalate
  • PS polystyrene
  • PP polypropylene
  • PLA polylactic acid
  • the sealing wax particularly preferably has high water and/or grease resistance and particularly preferably meets the food law specifications for fatty fillings.
  • the circuit board or the coated carrier paper can be peeled off without tearing the cover.
  • further coatings are provided, for example made of SiOx or AlOx. It is possible that these coatings (AlOx or SiOx) are provided instead of the metallization to further increase the barrier.
  • the COF (Coefficient of Friction) on at least one of the two outer sides or surfaces and preferably on both surfaces is higher than 0.1 and preferably higher than 0.15.
  • the COF on at least one of the two outer sides is preferably below 2, preferably below 1.5, preferably below 1.2 and particularly preferably below 1.0.
  • the tensile strength Fmax in the machine direction is between 90 N and 95 N and preferably between 93 N and 94 N.
  • the tensile strength in the cross-machine direction is particularly preferably between 55 N and 60 N and particularly preferably between 57 N and 59 N.
  • the difference in length at the breaking point is between 2% and 16% in the machine direction and between 4% and 15% in the transverse direction. These values are measured based on DIN EN ISO 1942-2.
  • the modulus of elasticity in the machine direction is particularly preferably between 1500 and 8000 MPa, preferably between 5500 and 6600 MPa and particularly preferably between 6000 and 6300 MPa.
  • the modulus of elasticity in the transversal direction is particularly preferably between 1500 MPa and 4000 MPa, preferably between 3300Mpa and 3700Mpa. These values are also preferably determined based on DIN EN ISO 1942-2.
  • the coated backing paper preferably has a puncture resistance of between 55 N and 65 N, preferably between 57 N and 63 N and particularly preferably between 58 N and 61 N (measured with a 10.5 mm mandrel diameter, at a puncture speed of 20 mm/min, based on to DIN EN ISO 14477).
  • the coated carrier paper has an optical density of 0.5. In this way, comparable light protection is achieved as with a 50 ⁇ m thick, white-pigmented PET film.
  • the WVTR water vapor transmission rate
  • the WVTR water vapor transmission rate is preferably less than 50 g/(m 2 ⁇ day), more preferably less than 20 g/(m 2 ⁇ day) and particularly preferably less than 8 g/(m 2 ⁇ day). Measurements were taken at 23° C. and 50% humidity (measured according to DIN EN ISO 15106-3).
  • the OTR is preferably less than or equal to 300 ccm/(m 2 d bar) (measured at 23° C. and 50% atmospheric humidity, measured according to DIN EN ISO 15105-2).
  • the barrier properties are preferably selected in such a way that the fermentation of the filling material is not impaired, but at the same time a good barrier effect for flavoring substances is achieved.
  • the barrier values can be selected in such a way that, depending on the filling, there are good fermentation properties and that no drying out occurs in the case of fillings containing water.
  • the seal seam strength (SNF) measured on a PP cup at a movement speed of 80 mm/min is preferably at a Sealing temperature in the range from 160°C to 300°C and 1s sealing time and 2.35 bar sealing pressure, sealed with a flat sealing jaw on average between 1 N - 8 N, preferably ⁇ 2 N and ⁇ 7 N without tearing the paper fibers when peeling the cover material from the PP -A cup.
  • a fracture pattern preferably appears here which indicates a cohesive fracture in the heat-sealing lacquer layer. This fracture pattern can be detected with an IR-ATR measuring device become.
  • the SNF measured on a PE cup at a movement speed of 80 mm/min at a sealing temperature in the range from 160° C. to 300° C. and 1 s sealing time and 2.35 bar sealing pressure, sealed with a flat sealing jaw averages between 1 N - 8 N, preferably ⁇ 2 N and ⁇ 7 N without paper fiber tearing when peeling the cover material from the PE cup.
  • a fracture pattern preferably appears here which indicates a cohesive fracture in the heat-sealing lacquer layer. This fracture pattern can be detected with an IR-ATR measuring device.
  • the present invention is also directed to a container (e.g. cup, tray, jar, trough pack, blister, bowl, milk jar, bottle, can, capsule), in particular for accommodating food, pet food items, hygiene items, or pharmaceutical products, which has a cover made of a coated backing paper of the type described above.
  • the container particularly preferably consists of a material which is selected from a group of materials which includes APET, PETG, PS, PP, PLA, coated paper, HD PE, paper/PE, paper/PP, ionomer-coated/lacquered papers/ includes cardboard and the like.
  • the container particularly preferably has a filling volume which is between 10 mL and 5000 mL, preferably 10 mL-500 mL and particularly preferably 12 mL-200 mL.
  • a combination of the following methods is preferably selected. Smooth roller processes and gravure / flexographic / offset printing processes with coating units are preferably used.
  • the coated carrier paper according to the invention allows a high functionality even after a corresponding product has been stored for, for example, 3 months (at, for example, 6° C.). This means that there are no leaks between the cover and the container and the peelability also remains essentially the same. In addition, there is no negative impact from drying out or poor fermentation.
  • the product or the coated carrier paper is recyclable and repulpable in accordance with EN 13430.
  • the coated backing paper has good rigidity and allows a wide sealing window between 160°C and 300°C.
  • the embodiments preferably meet the requirements of the food law guidelines for paper food packaging.
  • Examples include: Yoghurt packaging, dry pet food, wet wipe packaging, tray packaging, blister packaging, soup tureens, bowls for vegetables, fruit, salad, sausage, cheese or fish packaging, sundaes, portion packaging in the catering sector (honey, butter, jam, Nutella, etc.), confectionery packaging (biscuits, chocolates), snack packaging.
  • FIG. 1 shows a schematic representation of an embodiment of a coated carrier paper according to the invention. This has a carrier 2 with a first surface 2a and a second surface 2b, the ratio of the illustrated thicknesses of the individual layers not having to correspond to the actual ratios.
  • the reference number 4 denotes a print and the reference number 6 denotes an overprint varnish, which preferably also represents the outermost layer of the coated backing paper 1 .
  • the reference number 22 designates an OTR lacquer layer, which likewise adjoins the first surface 2a of the carrier 2 .
  • the reference number 3 designates a metallization layer which rests on the carrier 2 and more precisely on the first surface 2a of the carrier 2 here.
  • a primer (not shown) can be arranged between metallization and paper. Alternatively or in addition to this, the paper could be coated. However, it is also possible and in some embodiments preferred that the metallization is applied directly to the paper surface.
  • the layer thickness of the metallization is preferably between 30 - 100 nm, regardless of any primer or coating that may be present.
  • the reference number 24 designates a further metallization layer, which in this case bears against the second surface 2b of the carrier.
  • the two metallization layers 3 and 24 are optional.
  • the reference number 26 designates an optional first primer, which here adjoins the metallization layer 24, and the reference number 28 designates a further OTR lacquer layer.
  • the reference number 32 designates a further (optionally present primer or a primer layer.
  • the reference number 12 designates a barrier lacquer which is used to seal the coated backing paper or the container (not shown) on which this coated backing paper is arranged.
  • the reference number 16 designates a further (optionally present) primer or a corresponding primer layer.
  • Numeral 14 designates a heat seal lacquer. This preferably serves to attach the coated backing paper to a container (not shown).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
EP22212534.6A 2021-12-15 2022-12-09 Stratifié pour couvrir des récipients Pending EP4198198A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021133171.4A DE102021133171A1 (de) 2021-12-15 2021-12-15 Laminat zur Abdeckung von Behältnissen

Publications (1)

Publication Number Publication Date
EP4198198A1 true EP4198198A1 (fr) 2023-06-21

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EP22212534.6A Pending EP4198198A1 (fr) 2021-12-15 2022-12-09 Stratifié pour couvrir des récipients

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EP (1) EP4198198A1 (fr)
DE (1) DE102021133171A1 (fr)

Citations (10)

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