WO2024028413A1 - Procédé de fabrication de papier à imperméabilité à la graisse et à l'huile améliorée, papier produit et son utilisation - Google Patents

Procédé de fabrication de papier à imperméabilité à la graisse et à l'huile améliorée, papier produit et son utilisation Download PDF

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Publication number
WO2024028413A1
WO2024028413A1 PCT/EP2023/071461 EP2023071461W WO2024028413A1 WO 2024028413 A1 WO2024028413 A1 WO 2024028413A1 EP 2023071461 W EP2023071461 W EP 2023071461W WO 2024028413 A1 WO2024028413 A1 WO 2024028413A1
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WO
WIPO (PCT)
Prior art keywords
approximately
paper
aqueous solution
weight
collagen hydrolyzate
Prior art date
Application number
PCT/EP2023/071461
Other languages
German (de)
English (en)
Inventor
Berthold Köhler
Matthias Reihmann
Peter Reiter
Nina RITTEREISER
Original Assignee
Gelita Ag
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 Gelita Ag filed Critical Gelita Ag
Publication of WO2024028413A1 publication Critical patent/WO2024028413A1/fr

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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
    • 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
    • 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
    • D21H19/50—Proteins
    • 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 present invention relates to a method for producing a paper with improved grease and oil resistance.
  • the invention further relates to a paper with improved grease and oil tightness, which is produced according to this process, and to the use of the paper as a packaging material.
  • paper as a packaging material, or as a component of packaging materials, has long been known.
  • paper has the fundamental advantage over most other packaging materials that it is biodegradable and easily recyclable.
  • paper has the disadvantage that it is very easily penetrated or penetrated by hydrophobic substances such as oils and fats, which severely limits or makes impossible the usability of pure paper packaging for corresponding products, especially for greasy or oily foods.
  • packaging made from various composite materials in which the paper is provided with a barrier layer for fats or oils.
  • barrier layers are usually based on synthetic polymers, in particular on fluorine-containing polymers or siloxane compounds, which generally have poor or no biodegradability.
  • the use of such packaging is therefore extremely disadvantageous in terms of environmental impact, especially marine pollution, and recycling is often only possible to a limited extent or requires increased effort.
  • the invention is therefore based on the object of proposing a method for producing a paper with improved grease and oil tightness, the paper produced being biodegradable.
  • aqueous solution comprising about 10 to about 50% by weight of collagen hydrolyzate and at least about 0.1% by weight of a plasticizer;
  • Collagen hydrolyzate is a hydrolysis product of the animal structural protein collagen. Collagen hydrolyzate is completely biodegradable and harmless to health, so that paper produced using the method according to the invention not only fully meets the requirement of biodegradability, but is also suitable as a packaging material, particularly for food.
  • the papers produced according to the invention also have a very high gloss and excellent printability.
  • the improved grease and oil tightness of the paper produced according to the invention means improved tightness against hydrophobic substances. zen in general. These include in particular vegetable and animal fats and oils, ie triglycerides, which are solid (fats) or liquid (oils) at room temperature. This is particularly relevant when used as food packaging. However, the tightness also improves compared to hydrophobic substances based on synthetic materials or mineral oil, which is relevant, for example, when used as packaging material for cosmetics.
  • the grease and oil tightness of paper can be quantified in particular using the so-called KIT test, according to the TAPPI (Technical Association of the Pulp and Paper Industry) test protocol T 559 cm-12.
  • plasticizers are known from the prior art and include in particular those plasticizers that are often used in combination with gelatin, for example in the production of soft capsules. Is preferred the plasticizer is selected from sugar alcohols, in particular glycerin, sorbitol or mixtures thereof.
  • the paper provided in step (a) of the method according to the invention is typically a paper based on cellulose, wood pulp and/or waste paper pulp. These technical raw materials for paper production are each based on cellulose, with cellulose consisting predominantly of cellulose and wood pulp also containing a portion of lignin.
  • the paper used in the context of the present invention is fundamentally not limited in terms of basis weight.
  • the invention therefore explicitly includes thicker materials such as cardboard and cardboard, even if, for the sake of simplicity, only the term “paper” is used here, regardless of the basis weight.
  • the paper has a basis weight of approximately 60 to approximately 200 g/m 2 , preferably of approximately 80 to approximately 150 g/m 2 , more preferably of approximately 90 to approximately 120 g/m 2 . This corresponds to the basis weight of papers that are usually used as packaging material (but also as writing paper, for example).
  • the aqueous solution that is applied to the first surface of the paper comprises approximately 10 to approximately 50% by weight of collagen hydrolyzate. It has been shown that a concentration of collagen hydrolyzate in this range leads to an aqueous solution that not only has a viscosity that is favorable for the application, but that the viscosity of the solution is then also relatively independent of the shear forces. In contrast, aqueous solutions with a higher concentration of collagen hydrolyzate show shear-thinning behavior, i.e. a decreasing viscosity with increasing shear forces. Lower concentrations of collagen hydrolyzate have the disadvantage that higher application quantities of the solution and longer drying times are required.
  • the aqueous solution comprises approximately 20 to approximately 45% by weight of collagen hydrolyzate, more preferably approximately 30 to approximately 40% by weight of collagen hydrolyzate. It It has been shown that this concentration is particularly advantageous for applying the aqueous solution to the surface of the paper.
  • the collagen hydrolyzate used in the process according to the invention is typically produced by chemical or enzymatic hydrolysis of collagen-containing animal starting materials.
  • the animal starting material is preferably selected from skin or bones of vertebrates, in particular cattle, pigs or sheep. Particular preference is given to producing the collagen hydrolyzate by enzymatic hydrolysis of gelatin, in particular using one or more endopeptidases.
  • Collagen hydrolyzate is typically present as a mixture of peptides with a certain molecular weight distribution, whereby this molecular weight distribution can be influenced by the respective hydrolysis conditions (in particular by the enzymes used, hydrolysis time, temperature and pH value).
  • the collagen hydrolyzate typically has an average molecular weight of about 500 to about 25,000 Da, preferably from about 1,000 to about 12,000 Da, more preferably from about 2,000 to about 6,000 Da. This information always refers to the weight-average molecular weight, which is determined using gel permeation chromatography.
  • a collagen hydrolyzate with an average molecular weight of approximately 3,000 Da can be used with particular advantage within the scope of the invention.
  • Such a collagen hydrolyzate is sold, for example, by the applicant GELITA AG in the form of a 50% solution under the name NOVOTEC® CP800.
  • the collagen hydrolyzate within the scope of the invention can be produced by recombinant gene expression.
  • natural collagen sequences especially from cattle or pigs, and expressing them in genetically modified cells (e.g. yeast, bacteria or plant cells, especially tobacco)
  • genetically modified cells e.g. yeast, bacteria or plant cells, especially tobacco
  • products can be produced that are compatible with the hydrolysis products of the corresponding ones collagen-containing raw materials are essentially identical. It is possible, among other things, to obtain a narrower or precisely specified molecular weight distribution.
  • the aqueous solution also includes plasticizers such as glycerin. As described above, a small proportion of approximately 0.1% by weight of plasticizer is often sufficient to reduce the brittleness of the coating formed and to significantly improve the grease and oil tightness of the paper produced, even after mechanical stress.
  • the aqueous solution can also contain higher proportions of plasticizer, such as up to approximately 5% by weight, although the properties of the paper produced are no longer significantly improved by significantly higher proportions.
  • the aqueous solution preferably comprises approximately 0.5 to approximately 1.5% by weight of plasticizer, more preferably approximately 0.8 to approximately 1.2% by weight.
  • the aqueous solution is applied at a solution temperature of approximately 40 to approximately 60 ° C, more preferably approximately 45 up to approx. 55 °C. It has been shown that the aqueous solution in this temperature range, especially with the above-mentioned preferred concentrations of collagen hydrolyzate, has a favorable viscosity for application to the paper surface.
  • step (b) of the method according to the invention can be carried out using various application methods known from the prior art, such as by spraying, rolling or doctoring.
  • Devices for applying the aqueous solution using a doctor blade or blade are known in the paper industry, for example as so-called coating units.
  • Further preferred application methods include applying the aqueous solution using a Film press, a size press or contactless using curtain coating (experienced curtain coating).
  • the basis weight of the coating obtained after drying results from the proportion of collagen hydrolyzate and plasticizer (and optionally other additives) as well as the application amount of the aqueous solution.
  • the application amount is advantageously selected so that after drying the coating comprising collagen hydrolyzate and plasticizer has a basis weight of approximately 8 to approximately 20 g/m 2 , preferably from approximately 9 to approximately 15 g/m 2 , more preferably from approx. 10 to approx. 12 g/m 2 .
  • an appropriate application quantity can be achieved, for example, with a squeegee distance of approximately 15 to approximately 30 pm.
  • the drying of the aqueous solution in step (c) of the process according to the invention is advantageously carried out at a temperature of approximately 30 to approximately 70 ° C, preferably of approximately 40 to approximately 60 ° C, more preferably of approximately 45 to approximately. 55°C. In this respect, it is advantageous if the aqueous solution already has a corresponding or similar temperature when applied, as described above.
  • the aqueous solution can optionally contain other additives in order to further improve the properties of the paper produced or to adapt it to certain requirements. Among other things, this can influence the printability, color fixation and wet strength of the paper.
  • additives can in particular be selected from pigments that are dispersed in the aqueous solution, binders such as starch, polyvinyl alcohol or gelatin, crosslinking agents such as tannins, and/or other additives such as sizing agents.
  • the aqueous solution comprises dispersed pigments, which are preferably selected from carbonates, silicates, bentonites or kaolin.
  • Dispersed pigments which are preferably selected from carbonates, silicates, bentonites or kaolin.
  • Flat plates are particularly suitable here chen-shaped embodiments of such pigments. These pigments can, under certain circumstances, further improve the fat and oil tightness of the paper by making the transport of the fat or oil-containing substance through the barrier layer even more difficult.
  • the aqueous solution comprises additional binders, such as modified starches, polyvinyl alcohol or a combination thereof.
  • additional binders such as modified starches, polyvinyl alcohol or a combination thereof.
  • cationized or anionized variants of such binders can lead to a further increased barrier function of the paper coating.
  • the barrier function can also be strengthened using other additives known from paper production, such as sizing agents.
  • a certain barrier effect against water, steam and/or various gases can also be achieved by adding a crosslinking agent.
  • Various crosslinking agents are known which cause chemical crosslinking of collagen hydrolyzate and, if necessary, a binder contained therein.
  • Biodegradable crosslinkers such as e.g. B. various tannins.
  • the selection and composition of the paper used as raw material also contributes to the tightness or barrier function of the paper product produced according to the invention.
  • the tightness of the raw paper has a decisive influence. This can be increased using units common in the paper industry, such as calenders.
  • the procedure further includes the steps:
  • aqueous solution comprising approximately 30 to approximately 50% by weight of collagen hydrolyzate and at least approximately 0.1% by weight of a plasticizer
  • Steps (b) and (b2) as well as (c) and (c2) can each be carried out simultaneously, in particular with the help of a suitable device (e.g. a film or size press) in order to apply the aqueous solution to both surfaces of the paper at the same time.
  • a suitable device e.g. a film or size press
  • steps (b2) and (c2) can be carried out after steps (b) and (c).
  • the present invention further relates to a paper with improved grease and oil tightness, which is obtainable according to the process according to the invention.
  • the advantages and preferred embodiments of the paper according to the invention have already been explained in connection with the method according to the invention.
  • the paper according to the invention has a grease and oil tightness that is improved in comparison to the paper used for the process, ie before the coating containing collagen hydrolyzate and plasticizer is applied.
  • the grease and oil tightness can be checked particularly with the help of the KIT Quantify tests according to the TAPPI test protocol T 559 cm-12, which results in a KIT value of 1 to 12. The higher the KIT value, the better the grease and oil tightness of the paper.
  • the paper according to the invention preferably has a KIT value of 10 or more, more preferably of 11 or more. Due to the addition of plasticizer, the KIT value of the paper according to the invention is not significantly affected by mechanical stress such as bending or folding.
  • the present invention further relates to the use of the paper according to the invention as a packaging material, in particular for packaging oily or fatty foods or cosmetics.
  • the paper according to the invention can be used as packaging material for chocolate or similar products.
  • the improved grease and oil tightness of the paper according to the invention is maintained even at temperatures of over 200 ° C.
  • the method according to the invention or the paper according to the invention is therefore also suitable for high-temperature applications, for example for food packaging in which the food in question is warmed up and/or cooked, in particular in an oven. Examples of this are baked goods that are baked by the consumer in appropriate packaging.
  • the invention also relates to the use of the paper according to the invention as baking paper.
  • a standard office paper with a basis weight of 100 g/m 2 was used as the starting paper.
  • the coating was carried out with aqueous solutions, each containing 40% by weight of a collagen hydrolyzate with an average molecular weight of approx. 3,000 Da (NOVOTEC® CP800), as well as different amounts of the plasticizer glycerol of 0.87% by weight, 2.61% by weight. % and 4.35 wt.%.
  • aqueous solutions each containing 40% by weight of a collagen hydrolyzate with an average molecular weight of approx. 3,000 Da (NOVOTEC® CP800), as well as different amounts of the plasticizer glycerol of 0.87% by weight, 2.61% by weight. % and 4.35 wt.%.
  • the aqueous solution was doctored onto a surface of the paper with a knife distance of 20 pm, then the paper was dried at 50 °C and conditioned overnight at 22 °C.
  • the amount of coating applied after drying was between 12 and 14 g/m 2 .
  • the grease and oil tightness of the coated papers was determined on the one hand without mechanical stress and on the other hand after mechanical stress on the paper by rolling it up and unrolling it with a radius of approx. 1 to 2 cm.
  • the KIT value of the paper coated without plasticizer drops significantly from 10 to 8 due to the mechanical stress.
  • KIT values of 10 to 12 were measured for the coated paper using the test method described above.
  • the paper was heated in an oven to 220 °C or 250 °C for one hour. This resulted in a slight brown color compared to the raw paper (more pronounced at 250 °C than at 220 °C), but there was no smoke or burning smell. Repeating the KIT test after heating and cooling the paper continued to show high KIT values in the range of 10 to 12. This shows that the fat and oil tightness of the paper caused by the collagen hydrolyzate is maintained even at high temperatures.

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  • Paper (AREA)

Abstract

La présente invention concerne un procédé de production de papier présentant une imperméabilité à la graisse et à l'huile améliorée, comprenant les étapes suivantes : (a) la fourniture d'un papier présentant une première et une seconde surface ; (b) l'application d'une solution aqueuse sur la première surface, la solution aqueuse comprenant environ 10 à 50 % en poids d'hydrolysat de collagène et au moins environ 0,1 % en poids d'un plastifiant ; (c) le séchage de la solution aqueuse afin d'obtenir un revêtement comprenant l'hydrolysat de collagène et le plastifiant sur la première surface.
PCT/EP2023/071461 2022-08-03 2023-08-02 Procédé de fabrication de papier à imperméabilité à la graisse et à l'huile améliorée, papier produit et son utilisation WO2024028413A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022119507.4 2022-08-03
DE102022119507.4A DE102022119507A1 (de) 2022-08-03 2022-08-03 Verfahren zur Herstellung eines Papiers mit einer verbesserten Fett- und Öldichtigkeit, hergestelltes Papier und dessen Verwendung

Publications (1)

Publication Number Publication Date
WO2024028413A1 true WO2024028413A1 (fr) 2024-02-08

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PCT/EP2023/071461 WO2024028413A1 (fr) 2022-08-03 2023-08-02 Procédé de fabrication de papier à imperméabilité à la graisse et à l'huile améliorée, papier produit et son utilisation

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DE (1) DE102022119507A1 (fr)
WO (1) WO2024028413A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19518247A1 (de) * 1995-05-18 1996-11-21 Stoess & Co Gelatine Wasserresistentes Barrierematerial
DE69223024T2 (de) * 1991-12-16 1998-06-18 Nat Starch Chem Invest Essbare Folie
EP2182113A1 (fr) * 2008-10-30 2010-05-05 Kuraray Europe GmbH Procédé destiné à l'application au rideau de substrats sans utilisation de tensioactifs
WO2013173434A1 (fr) * 2012-05-15 2013-11-21 Mantrose-Haeuser Co., Inc. Revêtement d'emballage alimentaire à base d'algues
WO2015040134A1 (fr) * 2013-09-18 2015-03-26 Innogel Ag Matériau d'emballage comportant un revêtement barrière à base d'amidon, matière de revêtement et procédé de fabrication correspondant
DE102018120420A1 (de) * 2018-08-22 2020-02-27 Gelita Ag Proteinriegel
WO2020056124A1 (fr) * 2018-09-12 2020-03-19 Sm Technology Holdings Llc Revêtements formant barrière d'origine biologique
DE102020123736A1 (de) * 2020-09-11 2022-03-17 Gelita Ag Verfahren zur Behandlung einer Oberfläche und Verwendung von Kollagenhydrolysat zur Behandlung einer Oberfläche

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004019734A1 (de) 2004-03-31 2005-11-03 Dresden Papier Gmbh Papiere mit hohem Durchdringungswiderstand gegen Fette und Öle und Verfahren zu deren Herstellung
DE102005044321A1 (de) 2005-09-16 2007-03-29 Kalle Gmbh Pigmentierter und innenimprägnierter Cellulose-Faserdarm
PL220549B1 (pl) 2012-03-08 2015-11-30 Univ West Pomeranian Szczecin Tech Kompozycja do powlekania celulozowego materiału opakowaniowego, sposób otrzymywania kompozycji do powlekania celulozowego materiału opakowaniowego, termoizolacyjny materiał opakowaniowy, zwłaszcza do produktów spożywczych oraz sposób otrzymywania termoizolacyjnego materiału opakowaniowego, zwłaszcza do produktów spożywczych

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69223024T2 (de) * 1991-12-16 1998-06-18 Nat Starch Chem Invest Essbare Folie
DE19518247A1 (de) * 1995-05-18 1996-11-21 Stoess & Co Gelatine Wasserresistentes Barrierematerial
EP2182113A1 (fr) * 2008-10-30 2010-05-05 Kuraray Europe GmbH Procédé destiné à l'application au rideau de substrats sans utilisation de tensioactifs
WO2013173434A1 (fr) * 2012-05-15 2013-11-21 Mantrose-Haeuser Co., Inc. Revêtement d'emballage alimentaire à base d'algues
WO2015040134A1 (fr) * 2013-09-18 2015-03-26 Innogel Ag Matériau d'emballage comportant un revêtement barrière à base d'amidon, matière de revêtement et procédé de fabrication correspondant
DE102018120420A1 (de) * 2018-08-22 2020-02-27 Gelita Ag Proteinriegel
WO2020056124A1 (fr) * 2018-09-12 2020-03-19 Sm Technology Holdings Llc Revêtements formant barrière d'origine biologique
DE102020123736A1 (de) * 2020-09-11 2022-03-17 Gelita Ag Verfahren zur Behandlung einer Oberfläche und Verwendung von Kollagenhydrolysat zur Behandlung einer Oberfläche

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