EP3047068B1 - Matériaux d'emballage, avec un revêtement barrier à base d'amidon et revêtement masse et procede de production de celui - Google Patents

Matériaux d'emballage, avec un revêtement barrier à base d'amidon et revêtement masse et procede de production de celui Download PDF

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Publication number
EP3047068B1
EP3047068B1 EP14771294.7A EP14771294A EP3047068B1 EP 3047068 B1 EP3047068 B1 EP 3047068B1 EP 14771294 A EP14771294 A EP 14771294A EP 3047068 B1 EP3047068 B1 EP 3047068B1
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EP
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Prior art keywords
starch
weight
plasticizer
coating
coating compound
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EP14771294.7A
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German (de)
English (en)
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EP3047068A1 (fr
Inventor
Rolf Müller
Federico Innerebner
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Innogel AG
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Innogel AG
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    • 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
    • D21H19/54—Starch
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a packaging material with a starch-based barrier coating, a process for the preparation of a packaging material with a starch-based barrier coating, a starch-based coating composition and their use for the surface sealing of packaging materials.
  • the barrier layer based on polyvinyl acetate is not soluble in water and thus interferes with the recycling of a cardboard treated in this way in recycling processes currently in use.
  • the use of a synthetic, poorly biodegradable coating tarnishes the reputation of carton packaging as an ecologically highly advantageous packaging solution. Since such coatings are also relatively expensive, there is still a need for cost-effective, ecologically meaningful coating compositions with a good barrier effect.
  • Starch-based coatings are known in the paper industry. These are used, for example, in the paper coating in coating colors to give cardboard more strength, or to improve the paper properties, such as reducing dust and smoothing surfaces, for better printability. Starch develops a high viscosity when cooking in solution even at low solids content. Thus, for example, a 10% starch solution at 40 ° C have a viscosity of> 5,000 mPas and is therefore not useful in conventional brushing.
  • partially degraded starches are usually used with average molecular weights of M w ⁇ 1'000'000 g / mol in order to keep the viscosity of the starch solution and thus of the coating composition in a manageable framework at higher solids contents (for example a 50% starch solution with a viscosity of ⁇ 3,000 mPas at 40 ° C).
  • Starch coatings of such degraded, degraded or partially degraded starches are relatively brittle and break easily in the manufacture of cardboard packaging.
  • the mechanical stresses during folding and grooves of the cardboard do not withstand such coatings, so that unwanted defects in the coating caused by the turn mineral oil residues can migrate into the packaged food.
  • Such compositions are therefore not useful as a barrier coating.
  • An object of the invention is thus to provide improved compositions for the coating of packaging materials, which can be used in an economically meaningful manner, efficiently and inexpensively applied to flat substrates and at the same time have an excellent barrier property.
  • the present invention relates to a multilayer packaging material comprising a planar substrate and at least one starch-based barrier layer applied thereto.
  • Another aspect of the invention relates to a process for producing this packaging material.
  • the invention further relates to a coating composition which is suitable for producing the packaging material according to the invention and is preferably used for the production of the packaging material.
  • the invention relates to the use of a starch-based coating composition for surface sealing of packaging materials in order to prevent or reduce the migration of, for example, contained in the packaging material lipophilic impurities in the packaged goods.
  • the coating compositions according to the invention are preferably used for this purpose.
  • Lipophilic impurities in the context of the present invention include mineral oil impurities resulting, for example, from residues of printing inks in recycled paper.
  • the impurities include linear, cyclic and aromatic hydrocarbons, in particular MOSH and / or MOAH.
  • starch As a natural polymer from renewable resources, starch has the distinct advantage that the price is low and the environmental balance is positive compared to synthetic products. Another advantage is that starch is already established in the paper industry and does not pose a disruptive factor in existing recycling processes.
  • a coating composition in the form of a solution with long-chain, ie high molecular weight, starch molecules is used, which can be applied efficiently with a high solids content to a suitable substrate or a carrier layer of a packaging material, preferably on paper, board or cardboard, and then on the film is filmed into a coherent barrier layer or a coherent barrier film.
  • This barrier layer substantially restricts or prevents the migration of lipophilic contaminants from the package or packaging into the packaged product. It has surprisingly been found that long-chain starch types can be usefully used for coating and the use of long-chain starch types in the barrier coating also leads to significantly better mechanical properties and barrier properties of the coating.
  • the coating composition of the invention is used as a solution, preferably as an aqueous solution, the solids content of which contains starch as the main component.
  • the barrier effect depends crucially on obtaining a full-coverage barrier coating that is virtually free of imperfections (eg pinholes) and that the barrier coating is flexible and non-sticky so that the multilayer packaging material thus obtained, for example the coated paper, can be removed by means of the In the packaging industry customary creasing and folding techniques can be processed without the barrier coating is thereby significantly damaged or impaired. This is the only way to ensure that the packaged goods, for example the packaged foodstuffs, are adequately protected against the entry of the above-mentioned contaminants, even during prolonged storage periods.
  • the coating composition according to the invention is based on starch.
  • the lower the molecular weight of the starch used the more brittle the starch or the barrier film produced therefrom, even at higher plasticizer contents. Brittle films are unusable as a barrier because they break easily or crack and thus allow the passage of impurities.
  • the viscosity of starch in solution increases massively with the molecular weight of the starch used. The viscosity in solution is primarily dominated by the largest starch macromolecules.
  • a low viscosity of the composition used for coating is desired.
  • the viscosity of the solution can be achieved by using a low solids content which correlates with a high water content of the solution. However, this water must be dried away at high cost in the production of packaging materials.
  • the coating composition according to the invention is obtained from a coating composition which comprises the constituents mentioned below for the coating composition, it being possible to use for the at least one starch any starch having a molecular weight M w of at least or more than 0.8 million g / mol.
  • the starch (s) and optionally further existing solid and / or liquid additives are typically stirred into an aqueous solution, preferably in water.
  • the terms coating composition and coating composition differ in that the coating composition in the sense of the present patent application means the composition which can be directly used for coating or in which the starch is already present in dissolved form.
  • M w the weight average molecular weight
  • the present patent application states that all stated amounts of starch are based on the sum of the proportions of starch plus plasticizer plus water. Accordingly, the softener components are based on the sum of starch plus plasticizer.
  • the proportion of the polymeric additive (s) is based on the sum of starch plus polymeric additive.
  • the proportion of the additive (s) is based on the dry mixture or composition.
  • the proportion of water is understood as the remainder to 100 wt .-%, wherein a filler, if any, is not taken into account in the calculation.
  • the starch is present in ready-to-use, finished coating mass in dissolved form.
  • the coating composition consists of the at least one starch, the proportion of which, based on starch, plasticizer and water, being determined in accordance with Table 1 explained below, being 0-70% by weight of at least one plasticizer. 50 wt .-% of at least one polymeric additive, 0-5 wt .-% of at least one additive, and a residue of water to 100 wt .-%.
  • the lower limit for the molecular weight M w of at least one starch in millions of g / mol is 0.8, preferably 1.0, more preferably 1.5, more preferably 2 , 0, more preferably 2.25, even more preferably 2.5, even more preferably 2.75, most preferably 3.0.
  • the upper limit for the molecular weight M w of the at least one starch in millions of g / mol in the coating composition is about 20, preferably 15, more preferably 12, even more preferably 10, even more preferably 9, even more preferably 8, even more preferably 7, most preferably 6.
  • the upper limit for the molecular weight M w of the at least one starch may be more than 20 million g / mol, preferably in the range of more than 20 to 50 million g / mol.
  • the proportion of starch in wt .-% in the coating composition is dependent on the molecular weight M w of the starch and is represented by the following Table 1.
  • the lower limit of the amount of starch in wt% for the respective molecular weights is given in Table 1 on line A1, a preferred lower limit on line A2, an even more preferred lower limit on line A3, an even more preferred lower limit on line A4, one more more preferred lower limit on line A5, an even more preferred lower limit on line A6, an even more preferred lower limit on line A7, most preferably on line A8.
  • the upper limit of the amount of starch in wt% for the respective molecular weights is given in Table 1 on line B1, a preferred upper limit on line B2, an even more preferred upper limit on line B3, an even more preferred upper limit on line B4, one more more preferred upper limit on line B5, an even more preferred upper limit on line B6, an even more preferred upper limit on line B7, most preferred is the upper limit according to line B8.
  • the lower and upper limits for the amount of molecular weight starch between or outside the values of Table 1 can be obtained by linear interpolation or by linear extrapolation.
  • the values can be obtained by linear extrapolation.
  • the erfindungsmässe coating composition may further contain one or more fillers.
  • the proportion of filler (s) is not taken into account in the calculation of the 100% by weight. Rather, the filler is added in addition to the 100 wt .-%.
  • the weight proportions of the substances mean in each case the dry substances and not the substances in their commercial form in which they contain a certain water content as moisture.
  • the water content in each case means the entire water, ie the water supplied plus the water, which is present in the substances, such as starch, as moisture / bound.
  • wt .-% always means weight fraction per part by weight.
  • the lower limit of the viscosity of the ready-to-use or employed coating compositions according to the invention in mPas, measured at 40 ° C. with a Brookfield viscometer at a rotational speed of 100 rpm, is 50, preferably 70, more preferably 100, most preferably 150.
  • the upper limit of the viscosity in mPas is 5,000, preferably 3,000, more preferably 2,500, even more preferably 2,200, even more preferably 2,000, even more preferably 1,800, even more preferably 1. 600, most preferably 1'500.
  • the viscosity of the coating composition is in the range of 200 to 1000 mPas.
  • the pH of the coating composition according to the invention is preferably> 4, preferably> 5, preferably> 6, more preferably> 6.5, most preferably> 6.7 and on the other hand preferably ⁇ 10, preferably ⁇ 9, preferably ⁇ 8.5 ,
  • any starch or any mixtures thereof can be used as the starch with regard to the origin and the preparation. They can be used, for example, in the native state, as well as in the physically and / or chemically / enzymatically modified state.
  • root starches such as potato starches or tapioca starches
  • tapioca starch is colorless and tasteless and there are no known genetically modified variants of tapioca starch.
  • pea starch since it has been found to have particularly good film-forming properties.
  • the strength is native, i. unmodified state used.
  • useful properties can be obtained at low cost.
  • substituted starches such as starch esters and starch ethers
  • starch esters and starch ethers are used, such as, for example, hydroxypropylated or acetylated starches.
  • hydroxypropylated or acetylated starches are used, such as, for example, hydroxypropylated or acetylated starches.
  • crosslinked starches are used, in particular crosslinked starch esters or crosslinked starch ethers, for example starch phosphates and starch adipates.
  • the crosslinking is weak.
  • starches are commercially available. By increasing the molecular weight associated with crosslinking, improved mechanical properties are obtained.
  • Particularly preferred are crosslinked hydroxypropylated starches, in particular weakly crosslinked hydroxypropylated starches. For ease of processing, non-crosslinked hydroxypropylated starches are preferred.
  • the starch is a non-crosslinked starch or a mixture of non-crosslinked starches.
  • substituted tapioca starch is used, in particular hydroxypropylated tapioca starch.
  • substituted pea starch is used, in particular hydroxypropylated pea starch.
  • amylose content of the starch (s) in% by weight is preferably ⁇ 60, more preferably ⁇ 50 even more preferably ⁇ 40, even more preferably ⁇ 37, even more preferably ⁇ 35. It has been found that high amylose contents result in a reduced extensibility of the barrier coating being able to lead.
  • no so-called "waxy” starches are used in the coatings according to the invention and the coating compositions.
  • starches having a dextrose equivalent (DE) of ⁇ 3, more preferably ⁇ 1, most preferably ⁇ 0.7, even more preferably ⁇ 0.5, even more preferably ⁇ 0.2, even more preferably ⁇ 0.1, very particularly preferably ⁇ 0.05.
  • DE dextrose equivalent
  • the DE value is a measure of how far the polymer degradation has taken place. At high DE values, poor mechanical properties are obtained.
  • the dextrose equivalent is determined according to ISO standard 5377.
  • starches are permitted which are approved for applications for contact with food.
  • a starch is considered as dissolved if, when viewed in a polarizing microscope, at least 80%, preferably at least 90%, preferably at least 95%, preferably at least 97%, more preferably at least 99% of the starch granules are in the swollen state and are no longer birefringent.
  • At least 10%, more preferably more than 30%, even more preferably more than 50%, even more preferably more than 70% and even more preferably more than 90% of these starch granules have burst or have already broken down into fragments.
  • the dissolved starch is a true molecular solution in which the starch granules are completely destructured, that is, destroyed, and no longer are any fragments of starch granules.
  • the dissolved form of starch is typically obtained in aqueous systems by the following measures: boiling the starch, particularly with a jet cooker, heating to a temperature above the gelatinization temperature, dissolving extruded amorphous starch, using pregelatinized starch. When dissolved, the starch grains first absorb water and gelatinize. Gelatinized starch granules easily break down into fragments under shear and these can then dissolve completely.
  • the gelatinized starch granules disintegrate into fragments, eventually creating a true molecular solution.
  • the degree of destructuring of the starch granules can be determined and determined by simple light microscopic observation, for example at 200 ⁇ magnification.
  • the starch is stained with iodine.
  • a high molecular weight M w of the starch is a prerequisite.
  • the at least one starch used to formulate the coating composition therefore has a molecular weight M w in millions of g / mol of at least 0.8, preferably 1.0, more preferably 1.5, even more preferably 2.0, even more preferably 2.25, even more preferably 2.5, more preferably 2.75, most preferably 3.0.
  • An upper limit for the at least one starch for formulating the coating composition generally does not exist.
  • the reason for this is that at very high molecular weights, such as> 20 million g / mol, the starch macromolecules are mechanically unstable.
  • the mass is stirred while cooking the starch, and the shear that occurs in this case is already sufficient to break the macromolecules, whereby a molecular weight M w of ⁇ 20 million g / mol can quickly result.
  • starches are used whose upper limit of molecular weight M w is in millions of g / mol, preferably 20, more preferably 15, even more preferably 12, even more preferably 10, even more preferably 9, even more preferably 8 more preferably 7, most preferably 6. As the molecular weight decreases, the preparation of the coating composition becomes easier and, finally, lower viscosities are obtained.
  • plasticizers are in principle all plasticizers listed in the prior art for starch and any mixtures thereof. Unless otherwise specified, the term plasticizer in the present application is intended to include a plasticizer and mixtures of plasticizers.
  • a low level of plasticizer leads to embrittlement of the barrier layer at low humidity, while a high plasticizer content leads to stickiness and a soft material of low elongation at high humidity.
  • Plasticizers can be used singly or in mixtures of different plasticizers.
  • polyols are used, such as glycerin, sorbitol, maltitol, erythritol, xylitol, mannitol, galactitol, tagatose, lactitol, maltulose, isomalt, maltol, etc., but also various sugars, such as sucrose / sucrose, maltose, trehalose, lactose, lactulose , Galactose, fructose, etc., as well Monosaccharides and oligosaccharides. Glycerol is particularly preferred as a plasticizer. Water is also a plasticizer for starch, but is not included in the plasticizers and taken into account separately.
  • the upper limit of the plasticizer content of the coating composition in% by weight, based on starch plus plasticizer, is 70, preferably 60, more preferably 55, more preferably 50, even more preferably 46, most preferably 42.
  • the lower limit of the plasticizer content of the coating composition in% by weight, based on starch plus plasticizer, in one embodiment is 0. According to further embodiments, the lower limit for the plasticizer content of the coating composition in% by weight, based on starch plus plasticizer, is preferred 5, more preferably 10, more preferably 15, even more preferably 20, even more preferably 25, even more preferably 28, even more preferably 31, even more preferably 32.5, most preferably 33.5.
  • the limits for the plasticizer content of the barrier layer correspond to the limits for the plasticizer content of the coating composition.
  • plasticizers having a maximum melting temperature of 150 ° C for the anhydrous plasticizer, preferably 125 ° C, more preferably 110 ° C, even more preferably 95 ° C, most preferably 70 ° C are used.
  • the proportion of these plasticizers in the total plasticizer content is in wt .-%> 50, preferably> 70, more preferably> 80, most preferably> 90. With decreasing melting temperature of the plasticizer whose softening effect increases.
  • plasticizers having a molar mass in g / mol of> 90, preferably> 120, preferably> 140, preferably> 150, most preferably> 160 are used.
  • the proportion of plasticizers which fulfill this condition in the total plasticizer content of the coating composition is in wt .-%> 10, preferably> 20, more preferably> 30, most preferably> 40.
  • the Plasticizer With increasing molecular weight of the plasticizer decreases its migration ability, the Plasticizer then has a reduced tendency to migrate from the barrier coating into the substrate of the packaging material, for example the paper. By migrating the plasticizers, the barrier coating loses flexibility.
  • a combination of at least 2 plasticizers is used, preferably at least 3 plasticizers, wherein in the combination the individual plasticizers are represented by at least 5%, preferably at least 10, most preferably at least 15%.
  • Two isomeric plasticizers are considered as different plasticizers.
  • the combination of plasticizers can reduce the tendency of individual plasticizers to crystallize. Upon crystallization, the softening effect disappears.
  • the coating composition may optionally be admixed with at least one further polymeric additive to modify the mechanical properties of the barrier coating or barrier layer advantageously, in particular in order to increase their flexibility, and to improve the processability of the coating composition.
  • these modifying polymers contribute to an increase in the solids content.
  • Suitable modifying polymers are in principle all hydrophilic substances and mixtures thereof, in particular hydrophilic polymers and preferably those from vegetable sources.
  • this polymer contains polar groups, such as hydroxyl groups, carboxyl groups, or ionic groups, such as carboxylate or sulfonate groups.
  • modifying polymers are hydrocolloids and gums, such as galactomannans, such as guar gum or locust bean gum; Cellulose derivatives, in particular cellulose ethers; Pectins, especially rhamnogalacturonans and protopectins; dextrans; xanthan; zymosan; Seaweed hydrocolloids such as alginates, agar-agar, agarose, carrageenan and carrageenans; furcellaran; Hydrocolloids off Lichens, such as lichenin and isolichenine, or hydrocolloids as exudates of wood, such as tragacanth (astragalus gum), karaya gum, gum arabic, kutira gum; inulin; Latex; chitin; chitosan; gellan; collagen; Gelatin; casein; Starch having a molecular weight M w of less than 800,000 g / mol and any combinations thereof.
  • galactomannans
  • the maximum level of modifying polymer or modifying polymers of the coating composition, as well as in the barrier coating, in weight percent, based on starch plus modifying polymer is 50, more preferably 40, even more preferably 30, even more preferably 20 more preferably 10, more preferably 5, even more preferably 2.5, most preferably 1.5.
  • the minimum amount of modifying polymer or modifying polymers of the coating composition, as well as in the barrier coating, in weight percent, based on starch plus modifying polymer, is 0.01, preferably 0.05, more preferably 0.1, even more preferably 0.3, more preferably 0.6, even more preferably 0.8, most preferably 1.0. Since the modifying polymer is an optional component, the minimum amount may also be 0% by weight.
  • xanthan gum is used as a modifying polymer, since xanthan gum also can particularly effectively prevent the sedimentation of suspended solids in the coating composition, such as fillers, and optionally residues of starch granules.
  • a maximum proportion of ⁇ 2.5% by weight of xanthan as modifying polymer of the coating composition and of the barrier coating has proved to be particularly advantageous in further embodiments.
  • the minimum amount of xanthan in% by weight is 0, preferably 0.01, more preferably 0.05, even more preferably 0.1.
  • Xanthan gum may be used in particular in combination with any one or more of the aforementioned starches. In particular, any combination with the other components, ie, plasticizers, polymeric additives, fillers, additives, lecithin and fatty acids according to the invention are also included.
  • water-soluble cellulose derivatives are used, for example methylcellulose, ethylcellulose, hydroxyethylcellulose, Carboxymethylcellulose, hydroxyethylmethylcellulose or hydroxypropylmethylcellulose.
  • PVA polyvinyl alcohol
  • a 4% solution of the PVA at 20 ° C. according to DIN 53015 has a viscosity in mPas of> 3, preferably> 5, more preferably> 7, more preferably> 10, most preferably> 15.
  • the maximum level of PVA in weight percent based on starch plus PVA is 40, more preferably 30, even more preferably 20, even more preferably 15, even more preferably 10, even more preferably 7, even more preferably 5, most especially 4.
  • the minimum proportion of PVA in% by weight is 0, preferably 0.1, more preferably 0.3, even more preferably 0.6, even more preferably 1, even more preferably 1.5, even more preferably 2, very particularly preferably 3 PVA may be used in particular in combination with any one or more of the aforementioned starches.
  • any combination with the other components, ie plasticizers, polymeric additives, fillers, additives, lecithin and fatty acids according to the invention are also included.
  • xanthan and PVA are, of course, to be understood as forming a proportion of the modifying polymers if one or both components are present or the modifying polymer contains only xanthan and / or PVA.
  • the quantitative ranges for xanthan and PVA are therefore not to be understood as being additive to the abovementioned general quantitative ranges for the modifying polymer (s).
  • the limits for the modifying polymer content of the barrier coating correspond to the limits for the proportion of modifying polymer in the coating composition.
  • the filler component of the coating composition or of the barrier coating is all components which are virtually insoluble in water or are present in the coating composition, as well as in the barrier coating, in the form of particles, such as, for example, pigments, glass particles, soot particles, mineral particles such as titanium dioxide, Talc, carbonates.
  • the filler component is mathematically subtracted from the formulas, as it is not essential to most functional components of the formulation whether a filler component is present or not. Unless otherwise indicated and nothing else is obvious, therefore, the percentages by weight relating to the composition of the barrier coating in the following embodiments mentioned as particularly preferred in each case relate to the proportions without an optionally additionally present filler component.
  • the proportion of the filler component in wt .-% in the dry barrier layer so here the total mass of starch and optional components, but without water, at ⁇ 50, more preferably ⁇ 30, more preferably ⁇ 20, more preferably ⁇ 10, even more preferably, ⁇ 5 most preferably ⁇ 3.
  • the flexibility of the barrier coating is especially reduced at higher levels of filler.
  • the minimum weight percent filler component in the dry barrier layer is 0.1, more preferably 0.2, even more preferably 0.5, even more preferably 0.8, most preferably 1.0. Since the filler component is an optional component, the minimum level may also be 0% by weight.
  • the limits for the filler content of the barrier coating correspond to the limits for the filler content of the coating composition.
  • the coating composition of the invention may further optionally comprise one or more additives.
  • additives can be used as further components of the coating composition: surfactants, such as ionic or nonionic surfactants, wetting agents, defoamers, stabilizers, dyes, other polymers than those already mentioned, biocides, pH regulators, thixotropic agents.
  • the proportion of the additive or additives, based on the dry coating composition is 0 to at most 5% by weight.
  • the proportion is preferably ⁇ 3, more preferably ⁇ 2, even more preferably ⁇ 1, most preferably ⁇ 0.7. If present, the minimum level of additive (s) is preferably 0.1% by weight.
  • the limits for the additive content of the barrier coating correspond to the limits for the additive content of the coating composition.
  • the coating composition according to the invention and thus the barrier layer may also optionally contain lecithin and / or fatty acids.
  • the lecithin is preferably soy lecithin. Lecithin reduces the water sensitivity of the barrier layer, in particular, the toughness is increased at low humidity.
  • the lower limit of the lecithin content in the coating composition or the barrier layer in% by weight, based on the starch is 0, preferably 0.01, more preferably 0.05, even more preferably 0.1.
  • the upper limit of the lecithin content in the coating composition or the barrier layer in% by weight, based on the starch is 10, preferably 7, more preferably 5, even more preferably 4, even more preferably 3.
  • fatty acids are preferred. Stearic acid is particularly preferred. Fatty acids reduce the water sensitivity of the barrier layer, in particular, the stickiness is increased at high humidity.
  • the lower limit of the fatty acid content in the coating composition or the barrier layer in% by weight, based on the starch, is 0, preferably 0.01, more preferably 0.05, even more preferably 0.1.
  • the upper limit of the fatty acid content in the coating composition or the barrier layer in% by weight, based on the starch, is 10, preferably 7, more preferably 5, even more preferably 4, even more preferably 3.
  • Water is important for adjusting the viscosity of the coating composition.
  • a high water content makes drying difficult, as more water has to be removed from the barrier coating.
  • the proportion of water for the formulation of or in the coating composition results arithmetically from the difference of 100% by weight minus the sum of the percentages by weight of all components other than the fillers.
  • barrier layer is preferably applied in two passes, For each pass preferably a basis weight (dry) of 5 to 15 g / m 2 is applied.
  • the starch is a hydroxypropylated tapioca starch having a molecular weight in millions of g / mol in the range from 1 to 20, preferably from 2.5 to 10.
  • the plasticizer is preferably glycerol.
  • the plasticizer content in wt .-%, based on starch and plasticizer is in the range of 0-45, preferably from 15 to 37, the starch content, based on starch and water and plasticizer, is in the range of 14 to 35 wt .-%
  • the coating composition preferably also comprises a proportion of PVA of 1 to 30% by weight, preferably 1 to 20% by weight, more preferably 1 to 10% by weight.
  • the starch is a hydroxypropylated potato starch having a molecular weight in millions of g / mol in the range from 1 to 20, preferably from 2.5 to 10.
  • the plasticizer is preferably glycerol.
  • the plasticizer content in wt .-%, based on starch and plasticizer is in the range of 0-45, preferably from 15 to 37, the starch content, based on starch and water and plasticizer, is in the range of 14 to 35 wt .-%
  • the coating composition preferably also comprises a proportion of PVA of 1 to 30% by weight, preferably 1 to 20% by weight, more preferably 1 to 10% by weight.
  • barrier layer is preferably applied in two passes, wherein a basis weight (dry) of 5 to 15 g / m 2 is preferably applied on each pass.
  • the present invention relates to the use of a starch-based coating composition or coating composition for Surface sealing of packaging materials to prevent or reduce the migration of lipophilic contaminants contained in the packaging material, such as mineral oil residues, in particular MOSH and / or MOAH.
  • the plasticizer With regard to the plasticizer, the polymeric additives, the additives and also optionally present filler reference is made to the above statements.
  • the lower limit and the upper limit for the proportion of the at least one starch in the coating composition in wt .-%, based on starch, plasticizer and water, depending on the molecular weight M w of the at least one strength is given by: M w million g / mol 0.8 1 1.5 2 2.3 2.5 2.8 3 6 7 8th 9 10 12 15 20 Lower limit 14.4 14.1 13.3 12.6 12.2 11.9 11.5 11.1 6.7 5.2 3.7 2.5 2.4 2.2 2.1 1.7 Upper limit 40.6 40.3 39.6 38.8 38.5 38.1 37.7 37.4 32.9 31.4 30.0 28.5 27.0 24.0 19.6 12.2 and wherein the lower and upper limits for the proportion of said starch at molecular weights intermediate between the values of the table can be obtained by linear interpolation. Further preferred limits can be found in Table 1 above. All coating compositions disclosed above represent
  • the barrier layer according to the invention may further comprise fillers.
  • fillers the sum of all components contained in the barrier layer, with the exception of the optionally contained fillers, gives 100 wt .-%. If present, the proportion of filler is additionally added to the coating composition.
  • the plasticizer With regard to the plasticizer, the polymeric additives and the additives as well as the optionally also present filler reference is made to the above statements.
  • Part of the water of the coating composition may be bound in the solidified barrier layer.
  • the remaining water is lost mainly in the drying of the packaging material.
  • the maximum water content of the barrier layer in the finished packaging material immediately after the production is at most 25% by weight, preferably at most 20% by weight, more preferably at most 15% by weight, even more preferably at most 10% by weight, still more preferably at most 7 Wt%, more preferably at most 5 wt%, and most preferably at most 3 wt%.
  • the finished, dried barrier layer is preferably solid and not sticky.
  • the barrier effect of the barrier coating increases.
  • the surface of paper, board and cardboard is not really smooth, but has a more or less pronounced roughness - a kind of mountain and valley landscape - on.
  • the valleys In order to obtain a good barrier effect, the valleys must first be filled up and the layer should then cover even the highest mountain peaks.
  • rougher papers are also used in the packaging industry and a good barrier layer is also obtained with these papers it is necessary that thicker barrier coatings can be applied.
  • the best possible barrier effect and rougher papers therefore require a larger order quantity or a larger basis weight. But this also increases the material and process costs, in particular since thick layers can only be obtained by repeated application of coating material, with the applied layer in each case having to be dried in between.
  • the flexibility of the barrier coating is reduced with increasing thickness.
  • the upper limit for the basis weight (dry matter) of the barrier in g / m 2 is therefore 80, preferably 70, more preferably 60, more preferably 55, more preferably 50, even more preferably 45, even more preferably 40, more preferably 35, more preferably 30, most preferably 25.
  • the lower limit for the basis weight of the barrier in g / m 2 is 3, preferably 5, more preferably 7, more preferably 9, most preferably 10.
  • the upper limit of basis weight (dry matter) in g / m 2 for a single application is preferably 30, preferably 25, more preferably 20, more preferably 18, more preferably 17, even more preferably 16, even more preferably 15, most preferably 14. The thinner the application, the less likely blistering and pinholes are and the easier it is to dry the coating.
  • the lower limit of the basis weight (dry matter) in g / m 2 for a single application is preferably 3, preferably 4, more preferably 5, more preferably 6, even more preferably 7.
  • the barrier layers according to the invention are or remain flexible even on the packaging material. This is surprising since a per se flexible starch film, when applied to a paper, can often lose a lot of flexibility. If, for example, a casting material based on starch is poured onto a Teflon film and dried, then a soft and flexible film can be obtained. However, applying the same casting compound to a paper can result in a hard, inflexible film that already cracks even without mechanical stress. Since starch films usually require a level of plasticizer to be soft and flexible and not brittle, one might suspect that the film on the paper loses plasticizer to the paper and this is the reason for the embrittlement of a per se flexible starch film.
  • the barrier layers obtained according to the invention are characterized in that they are nationwide and have no defects, such as in the form of pinholes.
  • Pinholes or blisters typically result from the drying of the applied coating composition. After the coating composition has been applied to the paper, part of the coating composition is absorbed by the nearest paper layers. During drying, the coated paper side is treated with infrared radiation and / or hot air. The surface of the coating dries faster than the underlying layers, forming a barrier against the vapor in the area of the surface, which wants to escape from the lower layers. This leads to the formation of vapor bubbles, which eventually burst open and lead to defects in the barrier layer. The thicker the layer, the more difficult it is to avoid such blisters.
  • the packaging material according to the invention is multi-layered and comprises a planar substrate as the carrier layer and at least one barrier layer applied to the planar substrate, which is composed and constructed as explained above.
  • the barrier coating is applied to a flat substrate, which is suitable as packaging material.
  • the sheet-like substrate is preferably a paper, a cardboard or a cardboard. Unless otherwise mentioned, in the context of the present patent application the term paper should always also include cardboard.
  • Papers suitable as a barrier coating substrate have a basis weight in g / m 2 of preferably ⁇ 800, more preferably ⁇ 600, even more preferably ⁇ 500, even more preferably ⁇ 400, most preferably ⁇ 380.
  • m 2 is preferably> 30, more preferably> 50, more preferably> 70, even more preferably> 90, even more preferably> 110, most preferably> 120.
  • Paper is understood to mean paper in the narrower sense as well as cardboard and paperboard.
  • Particularly preferred papers are used as a substrate for the packaging material or as a carrier material for the barrier coating, which are permitted under food law and thus can be used as food packaging.
  • the barrier coating is applied to the back side of the substrate, ie the side which forms the inside of the packaging in the finished packaging. This results from the fact that a barrier with respect to the interior of the packaging or the packaged goods present therein should be obtained.
  • the backs of papers suitable for packaging are typically rough, while those for most a printing provided front pages are relatively smooth. However, papers with rather smooth backs are preferred, since smooth surfaces can be finished much easier with good barrier coatings.
  • a smoother reverse side can be obtained for example by means of a pre-coat.
  • the precursor means a layer which is applied to the paper substrate before the barrier layer.
  • the precoat can already be applied to the paper manufacturer.
  • the packaging materials according to the invention can have on the front side of the substrate, so the outside of the finished package, further, known in the art coatings or printed.
  • the barrier layer does not form the outside of the finished package, but is arranged so that it delimits the surface substrate, so the carrier material from the interior of the package and thus of the packaged goods contained in the package.
  • further layers may comprise on packaging material according to the invention.
  • the present invention also relates to packaging, in particular folded packages, which can comprise or be produced from the packaging material according to the invention.
  • packaging in particular folded packages, which can comprise or be produced from the packaging material according to the invention.
  • the starch-based barrier layer does not form the outside of the package.
  • the applied barrier layer consists of at least one layer.
  • the barrier layer is thus produced or applied in at least one application (passage, line).
  • 2 jobs are made with the application mass being dried therebetween.
  • 3 and more orders are possible, whereby 2 orders are preferred, and 3 orders are preferred before 4 orders.
  • the coating composition according to the invention can be provided by mixing the powdery starch present in a liquid phase, the liquid phase having at least water, preferably at least water and plasticizer.
  • the resulting suspension is then heated or "boiled” to a temperature above the gelatinization temperature.
  • the suspension may be used at atmospheric conditions, i. at a temperature of ⁇ 100 ° C, or it is cooked at temperatures> 100 ° C, for example at 130 ° C with a jet cooker.
  • precooked starch instead of cooking starch, i. Starch that must be cooked to develop viscosity, also precooked starch, such as pregelatinized starch.
  • precooked starch such as pregelatinized starch.
  • a starch kitchen is typically present in the paper industry by default, it is more advantageous to use the cheaper cooking strength.
  • Starch grain can absorb a multiple of its own weight of water, but initially present as a suspended particle. If the starch grain is maximally swollen, then the highest viscosity results. The higher the temperature at which the starch is cooked, the longer it is cooked and the more intensively the mixture is sheared, for example by a mixer, the more the swollen starch grain decomposes. First, it breaks down into fragments, which in turn disintegrate into smaller fragments, until finally a true molecular solution is created.
  • the viscosity is significantly reduced without the molecular weight having to decrease. Since the lowest possible viscosities are desired, it is advantageous if the starch is cooked to the extent that more or less a molecular solution has formed, which is typically the case when cooking with the jet cooker and using shear. If precooked starch is used, the cooking process is unnecessary, but it is advantageous to shear the mixture mechanically, for example by intensive stirring, in order to break down the starch granules and, if possible, to obtain a true solution of the starch macromolecules.
  • the pH is within a range where no chemical degradation of the starch takes place, which occurs at a pH of> 4, preferably> 5, even more preferably> 6, more preferably> 6.5. Ideally, the pH is in the range of 7.
  • the starch composition prepared in this way can then be applied to the paper with the desired weight per unit area using the methods known in the paper industry. While typical coatings in the paper industry are applied to the front of the paper, for a barrier layer, the coating is applied to the back of the paper.
  • the coating can be done in various ways: for example, the barrier mass may be painted, printed, cast, sprayed, rolled or otherwise planar and applied evenly. The necessary for the formation of an effective barrier layer thickness can be applied in one or more passes.
  • the barrier mass is applied by brushing or pouring.
  • Known and suitable coating methods are, for example, blade coating, knife coating and size press.
  • a particularly suitable casting method is curtain coating, in which case good barrier coatings with comparatively low application quantities could be obtained in particular.
  • the barrier coating is prepared in more than one stroke.
  • the coating is produced in 2 coating passes between which the substrate web does not necessarily have to be rolled up again.
  • a better barrier is obtained when a barrier layer of a given basis weight of eg 20 g / m 2 is applied in 2 passes, eg 10 g / m 2 being applied, instead of one pass where 20 g / m 2 is applied become.
  • a sufficient barrier coating can be obtained in 1 or 2 passes.
  • 2 to 4 strike passes may be necessary.
  • a first barrier layer or a first application for the barrier layer is obtained in-line with a paper machine. That the first application is obtained as a backsize immediately following the production of the paper on the fresh paper without the paper web having been previously rolled up. The second job is then done elsewhere after the paper web has been rolled up with the first job.
  • a precoat may be applied to the paper, paperboard or paperboard, or may have been previously applied, for example, by the papermaker, on the one hand serving to remove the water from the coating mass hampering the subsequent barrier layers from penetrating into the paper, cardboard or board and, on the other hand, smoothing the surface to be coated.
  • the precoat also has properties that reduce the migration of aliphatic and aromatic hydrocarbons.
  • a precoat it is possible to apply masses used in the paper industry to improve the surfaces, in particular in order to reduce the surface roughness, improve printability and machinability. So a mineral precoat, such as a carbonate precursor be used.
  • a primer may also be applied with a starch-based compound.
  • a starch-based pre-coat differs from the barrier layer according to the invention in that the pre-coat does not have all the features according to the invention of the barrier layer, ie, for example, has starch with a different molecular weight distribution and / or a different proportion than indicated in Table 1.
  • the preferred weight average molecular weight distribution M w of the starch used in the pre-coat in g / mol is> 500,000, preferably> 1,000,000, preferably> 2,000,000, preferably> 2,500,000, more preferably> 3 '000'000, most preferably>4'000'000.
  • solids content and plasticizer content of the precoat mass of dissolved starch With respect to the solids content and plasticizer content of the precoat mass of dissolved starch, what has already been mentioned previously in the sections "solids content of the coating composition” and “plasticizer” also applies.
  • the upper limit for the basis weight in g / m 2 is 30, preferably 25, more preferably 20, most preferably 15.
  • the lower limit for the basis weight of the precoat is 1, preferably 2, more preferably 3, and most preferably 5 g / m 2 .
  • One or more, preferably 2, 3 or 4 layers of the coating composition according to the invention, as explained in detail above, can then be applied to the precoat.
  • the speed with which the paper web to be coated is moved at the papermaker is around 100-1,000 m / min, which is a speed of 1.7-17, for the heavier papers preferably used as a substrate for the barrier coating m / s corresponds. Most processes are in the range of 200 - 800 m / min. In the further processing of papers, such as in a coater, sometimes lower speeds are used.
  • the barrier coating according to the invention can be produced at industrial speeds in a continuous process.
  • the coating composition is applied to the paper at an elevated temperature.
  • the temperature in ° C. of the coating composition when applied to the paper is> 20, more preferably> 30, more preferably> 35, even more preferably> 40, most preferably> 45.
  • the upper limit of the application temperature is dependent, for example, on the composition of the coating composition, but results unambiguously for the person skilled in the art inter alia from the abovementioned requirements on the viscosity and thus the spreadability of the coating composition.
  • the paper is heated so that immediately before application of the coating, the side facing the coating has a temperature in ° C of> 30, more preferably> 40, more preferably> 50, even more preferably> 60, even more preferably> 70 , most preferably> 80.
  • the coated with the coating composition paper can be dried with the usual in the paper industry drying process.
  • infrared (IR) radiators and hot air hoods are used. It is customary that the side of the paper is treated with IR or hot air on which a layer to be dried has been applied. In a preferred embodiment, however, at least part of the drying process is performed so that the other side of the paper is treated with IR or hot air (to which no layer to be dried has been applied).
  • both sides are treated simultaneously with IR or hot air.
  • FIG.1 A common device for painting, in particular of paper and cardboard, as in the prior art, is in Fig.1 shown schematically.
  • Essential components of such a device for coating a web 2 are the coating unit 4 and the subsequent drying device, usually consisting of an IR jet heater 8 and a hot air drying system 9.
  • the web is guided by so-called guide rollers 3.
  • the web can roll from one 1 unwound and rolled after drying again on such a l' become.
  • painting for example, can also be an intermediate step in a multistage, continuous process.
  • the coating composition may be applied to the substrate surface by knife coating, blading, casting, rolling, spraying, printing, or other methods suitable for applying liquid compositions.
  • FIG. 1 is an example of a common execution of a coating unit 4 outlined. About an applicator roll 5, which runs through a so-called swamp sump 6, the coating is applied to the paper. With a squeegee or a blade (blade) 7, the excess coating is stripped off. The coated web 2 'is passed over the drying 8, 9 and thereby dried so that it can be re-formed in a retractor to a paper roll 1', without sticking.
  • the drying processes known in the paper industry such as, for example, those based on infrared radiation and hot air or drying by means of hot rolls, are suitable.
  • a paper of known area is dried in a convection oven at 130 ° C for 15 min and then weighed. From the weight and the known area, the basis weight of the untreated paper in g / m 2 can be obtained.
  • a coated paper of known area is dried and weighed in the same manner and thus the grammage of the coated paper is in g / m 2 receive.
  • the basis weight of the coating in g / m 2 is obtained from the difference between the two basis weights.
  • M w is understood to mean the weight average molecular weight distribution.
  • the starch is in the form of a powder
  • the starch is suspended in water at a concentration of 3% dry matter. This suspension is then heated in a mini-autoclave with stirring up to 150 ° C and held there for 20 min. Subsequently, the solution thus obtained is cooled to about 60 ° C, diluted to 0.3% and filtered with a 0.005 mm membrane filter. The filtered solution is then measured by GPC-MALLS (gel permeation chromatography with multi-angle laser light scattering).

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  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Paper (AREA)
  • Wrappers (AREA)

Claims (21)

  1. Masse d'enduction aqueuse comprenant :
    - au moins un amidon,
    - de 0 à 70 % en poids d'au moins un plastifiant, la part en plastifiant étant rapportée à l'amidon plus le plastifiant,
    - de 0 à 50 % en poids d'au moins un adjuvant polymère, la part de/des adjuvants polymères étant rapportée à l'amidon plus l'adjuvant polymère,
    - de 0 à 5 % en poids d'un additif ou d'un mélange d'additifs, en rapport au mélange sec et
    - de l'eau, caractérisée en ce que
    l'amidon de la masse d'enduction se présente sous forme dissoute et présente une moyenne de la distribution de poids moléculaire Mw en g/mole de l'ordre de 0,8 millions à 50 millions, de préférence de l'ordre de 0,8 millions à 20 millions et la limite inférieure, ainsi que la limite supérieure de l'amidon dans la masse d'enduction en % en poids, en rapport à l'amidon et au plastifiant et à l'eau, en rapport du poids moléculaire Mw de l'amidon étant donné par : Mw millions g/mole 0,8 1 1,5 2 2,3 2,5 2,8 3 6 7 8 9 10 12 15 20 Limite inférieure 14,4 14,1 13,3 12,6 12,2 11,9 11,5 11,1 6, 7 5,2 3, 7 2,5 2,4 2,2 2,1 1, 7 Limite supérieure 40,6 40,3 39, 6 38,8 38,5 38,1 37,7 37,4 32,9 31,4 30,0 28,5 27,0 24,0 19,6 12,2
    les limites inférieures et supérieures pour la part de l'amidon avec une moyenne de la distribution de poids moléculaire Mw qui se situe entre les valeurs ou au-dessus de valeurs du tableau précédent étant obtenues par une interpolation linéaire ou par une extrapolation linéaire.
  2. Masse d'enduction selon la revendication 1, l'amidon étant de la fécule de tapioca, de l'amidon de petits pois, de la fécule de pommes de terre ou un mélange quelconque de ces derniers, notamment de la fécule de tapioca substituée, de l'amidon de petits pois substitué, de la fécule de pommes de terre substituée ou un mélange quelconque de ces derniers.
  3. Masse d'enduction selon la revendication 1 ou 2, la teneur en amylose de l'amidon se situant dans l'ordre de 0 à moins de 60 % en poids, de préférence dans l'ordre de plus de 0,5 à moins de 35 % en poids.
  4. Masse d'enduction selon l'une quelconque des revendications 1 à 3, la teneur en plastifiant se situant à environ 5 % en poids, de préférence à environ 10 % en poids, de manière encore plus préférentielle à environ 15 % en poids.
  5. Masse d'enduction selon l'une quelconque des revendications 1 à 4, la masse d'enduction comprenant au moins 2, de préférence au moins 3 plastifiants, sachant que dans l'association, les plastifiants individuels sont représentés à au moins 5%, de préférence à au moins 10%, de la manière la plus préférentielle, à au moins 15%.
  6. Masse d'enduction selon l'une quelconque des revendications 1 à 5, la masse d'enduction comprenant en % en poids un maximum de 30 % en poids, de préférence un maximum de 20 % en poids d'un ou de plusieurs adjuvants polymères.
  7. Masse d'enduction selon l'une quelconque des revendications 1 à 6, l'adjuvant polymère comprenant du xanthane et/ou de l'alcool polyvinylique, de préférence avec une part de 0,01 à moins de 2,5 % en poids de xanthane et/ou de 1 à 30 % en poids, de préférence de 1 à 10 % en poids d'alcool polyvinylique.
  8. Masse d'enduction selon l'une quelconque des revendications 1 à 7, l'au moins un amidon étant choisi dans le groupe constitué de la fécule de tapioca, de l'amidon de petits pois et de la fécule de pommes de terre et l'amidon étant un amidon hydroxypropylé avec un poids moléculaire en millions g/mole de 1 à 20, de préférence de 2,5 à 10, la teneur en plastifiant en % en poids en rapport à l'amidon et au plastifiant se situant dans l'ordre de 0 à 45 %, de préférence dans l'ordre de 15 à 37 et la teneur en amidon en % en poids, en rapport à l'amidon et à l'eau et au plastifiant se situant dans l'ordre de 14 à 35 % et le cas échéant, une part d'alcool polyvinylique en % en poids, en rapport à l'amidon et à l'alcool polyvinylique étant présente dans l'ordre de 1 à 30, de préférence de 1 à 20, de manière encore plus préférentielle, de 1 à 10.
  9. Utilisation d'une masse d'enduction basée sur de l'amidon pour sceller la surface de matières d'emballage, pour empêcher la migration d'impuretés lipophiles hors de la matière d'emballage dans le produit emballé, la masse d'enduction comprenant :
    - au moins un amidon avec une moyenne de la distribution de poids moléculaire Mw de l'ordre de 0,8 millions à 50 millions g/mole, de préférence de l'ordre de 0,8 millions à 20 millions g/mole,
    - de 0 à 70 % en poids d'au moins un plastifiant, la part en plastifiant étant rapportée à l'amidon plus le plastifiant,
    - de 0 à 50 % en poids d'au moins un adjuvant polymère, la part de/des adjuvants polymères étant rapportée à l'amidon plus l'adjuvant polymère,
    - de 0 à 5 % en poids d'un additif ou d'un mélange d'additifs, en rapport au mélange sec et
    - de l'eau.
  10. Utilisation selon la revendication 9, une masse d'enduction selon l'une quelconque des revendications 1 à 8 étant utilisée.
  11. Utilisation selon la revendication 9 ou 10, la couche formant barrière obtenue à partir de la masse d'enduction présentant un grammage en g/m2 dans l'ordre de 3 à 80 g/m2.
  12. Utilisation selon l'une quelconque des revendications 9 à 11, le scellement de surface s'effectuant par application de deux enductions successives et le poids d'application par enduction se situant dans l'ordre de 4 à 17 g/m2.
  13. Matière d'emballage multicouches, comprenant
    un substrat plan, choisi dans le groupe constitué du papier, du carton-pâte et du carton, en tant que couche porteuse et
    au moins une couche formant barrière sur base d'amidon, appliquée sur le substrat plan, la couche formant barrière comprenant
    - au moins un amidon avec une moyenne de la distribution de poids moléculaire Mw de l'ordre de 0,8 millions à 50 millions g/mole, de préférence de l'ordre de 0,8 millions à 20 millions g/mole,
    - de 0 à 70 % en poids d'au moins un plastifiant, la part en plastifiant étant rapportée à l'amidon plus le plastifiant,
    - de 0 à 50 % en poids d'au moins un adjuvant polymère, la part de/des adjuvants polymères étant rapportée à l'amidon plus l'adjuvant polymère,
    - de 0 à 5 % en poids d'un additif ou d'un mélange d'additifs, en rapport au mélange sec et
    - le cas échéant, de l'eau liée dans la couche formant barrière.
  14. Matière d'emballage selon la revendication 13, la couche formant barrière étant obtenue à partir d'une masse d'enduction selon l'une quelconque des revendications 1 à 8.
  15. Matière d'emballage selon la revendication 13 ou 14, la couche formant barrière étant appliquée sur une surface extérieure du substrat plan qui correspond à la face arrière de la matière d'emballage et de ce fait à la face intérieure d'un emballage qui doit être créé.
  16. Matière d'emballage selon l'une quelconque des revendications 13 à 15, le substrat plan comprenant en supplément un apprêt, de préférence un apprêt minéral, qui est placé entre la surface du substrat et la couche formant barrière.
  17. Emballage, comprenant la matière d'emballage multicouches selon l'une quelconque des revendications 13 à 16 et le cas échéant d'autres couches, la couche formant barrière formant la face intérieure de l'emballage.
  18. Procédé destiné à la fabrication d'une matière d'emballage multicouches selon l'une quelconque des revendications 13 à 16, comprenant les étapes
    a) de la mise à disposition d'un substrat plan, lequel est choisi dans le groupe constitué du papier, du carton-pâte et du carton, et lequel peut comporter le cas échéant un apprêt,
    b) de la mise à disposition d'une masse d'enduction selon l'une quelconque des revendications 1 à 8,
    c) de l'application de la masse d'enduction de l'étape b) sur au moins une face du substrat plan et de la création d'une couche sur le substrat plan et
    d) de l'augmentation de la température pour faire sécher et solidifier la masse d'enduction appliquée et transformée en un film.
  19. Procédé selon la revendication 18, dans lequel dans l'étape c), la masse d'enduction est appliquée au moyen d'un couchage par rideau.
  20. Procédé selon la revendication 18 ou 19, avant l'étape c), le procédé comprenant en supplément l'application d'un apprêt, de préférence d'un apprêt minéral.
  21. Matière d'emballage, susceptible d'être obtenue d'après le procédé selon l'une quelconque des revendications 18 à 20.
EP14771294.7A 2013-09-18 2014-09-18 Matériaux d'emballage, avec un revêtement barrier à base d'amidon et revêtement masse et procede de production de celui Active EP3047068B1 (fr)

Applications Claiming Priority (2)

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CH16022013 2013-09-18
PCT/EP2014/069939 WO2015040134A1 (fr) 2013-09-18 2014-09-18 Matériau d'emballage comportant un revêtement barrière à base d'amidon, matière de revêtement et procédé de fabrication correspondant

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EP3047068A1 EP3047068A1 (fr) 2016-07-27
EP3047068B1 true EP3047068B1 (fr) 2017-08-23

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JP2018047655A (ja) * 2016-09-23 2018-03-29 三菱重工機械システム株式会社 シートの不良除去装置及び方法、シートの不良除去制御装置、段ボールシートの製造装置
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US9840811B2 (en) 2017-12-12
US20160230342A1 (en) 2016-08-11
CA2924012A1 (fr) 2015-03-26
EP3047068A1 (fr) 2016-07-27
WO2015040134A1 (fr) 2015-03-26

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