EP4229238A1 - Gel de cellulose pour objets 3d - Google Patents

Gel de cellulose pour objets 3d

Info

Publication number
EP4229238A1
EP4229238A1 EP21783320.1A EP21783320A EP4229238A1 EP 4229238 A1 EP4229238 A1 EP 4229238A1 EP 21783320 A EP21783320 A EP 21783320A EP 4229238 A1 EP4229238 A1 EP 4229238A1
Authority
EP
European Patent Office
Prior art keywords
cellulose
based object
moulded
accordance
packaging
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
EP21783320.1A
Other languages
German (de)
English (en)
Inventor
Julien BRAS
Julia CHARDOT
Maria Isabelle GIARDIELLO
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.)
Societe des Produits Nestle SA
Nestle SA
Original Assignee
Societe des Produits Nestle SA
Nestle SA
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 Societe des Produits Nestle SA, Nestle SA filed Critical Societe des Produits Nestle SA
Publication of EP4229238A1 publication Critical patent/EP4229238A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/10—After-treatment
    • D21J1/14—Conditioning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/08—Impregnated or coated fibreboard
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/10—After-treatment

Definitions

  • the present invention relates generally to the field of three-dimensional cellulose- based objects, for example cellulose based packaging materials.
  • the present invention relates to molded cellulose-based objects with a functionalized surface, for example a smoother surface that reduces water absorption.
  • a molded cellulose-based object comprising a cellulose gel layer.
  • the cellulose gel layer may be obtained by sulfurization.
  • Packaging of manufactured food products is a vital part of the food industry today as it ensures food safety, preserves food quality and plays an important role in production processes, in brand communication and in digitalization. Indeed, several studies show that for a large part of consumers the packaging of a product is one key aspect that drives the purchase decision.
  • Plastic packaging is used frequently in the economy and in people's daily lives. It has multiple advantages, such as its flexibility and its light weight. Such a weight reduction contributes to fuel saving and CO 2 reduction during transport, for example. Its barrier properties help to reduce food waste due a positive effect on increasing shelf life. The barrier properties also help to secure food safety.
  • cellulose-based packaging material One step towards meeting the challenges mentioned above is to use cellulose-based packaging material.
  • cellulose based packaging materials are typically porous and absorb liquids, such as water or oil, for example, very well. This makes many cellulose-based packaging materials unsuitable for food products.
  • One way to address this is to use multi-layer paper-based materials. The necessity to use multiple layers, however, reduces the cellulose content of the packaging material.
  • 3D cellulose based packaging materials usually have rough surfaces, even rougher than paper. As a result, the use of large amounts of surface coating material is usually necessary.
  • the objective of the present invention was it to enrich or improve the state of the art and in particular to provide three-dimensional cellulose-based objects that are resistant against liquid absorption so that they can be used as packaging material, for example food packaging material, that have an as high cellulose content as possible and that can be recycled with the paper or carton stream, and/or that have a smooth surface that allows for polymer coating with small amounts of coating material, or to at least provide a useful alternative to solutions existing in the art.
  • the present invention provides a moulded cellulose-based object comprising a cellulose gel layer.
  • the present inventors have shown that it is possible to produce a three-dimensional, for example a moulded cellulose based object with a dried cellulose gel layer, so that the dried cellulose gel layer provides the three-dimensional cellulose based object with a liquid repellence, for example a water repellence and/or an oil repellence.
  • a cellulose gel layer to functionalize the surface of the three-dimensional cellulose-based object has the advantage that the cellulose content of the cellulose-based object can be very high. This in turn ensures that the moulded cellulose-based object can be recycled with the paper or the carton stream.
  • This dried cellulose gel also provides a smoother and non-porous surface, useful for an additional coating on the surface of such 3D molded pulp.
  • Figure 1 shows a surface view of a treated sample obtained with a Scanning Electronic Microscope (SEM). A homogenous cellulose gel layer can be observed.
  • SEM Scanning Electronic Microscope
  • Figure 2 shows a side view of a cut sample allowing a rough estimation of the cellulose gel layer thickness.
  • the image was obtained with a Scanning Electronic Microscope (SEM).
  • Figure 3 shows the surface of molded cellulose before (left) and after (right) the treatment to have cellulose gel at the surface.
  • the images were obtained with a Scanning Electronic Microscope (SEM).
  • the present invention relates in part to a moulded cellulose-based object comprising a dried cellulose gel layer.
  • the moulded cellulose-based object may be a three-dimensional object.
  • a three-dimensional object may be an object where one dimension is not significantly smaller than the other two dimensions.
  • a three dimensional object on dimension may have a length of not less than about 5% of the other two dimensions, not less than about 5% of the other two dimensions, not less than about 10% of the other two dimensions, not less than about 15% of the other two dimensions, not less than about 20% of the other two dimensions, not less than about 25% of the other two dimensions, not less than about 30% of the other two dimensions, not less than about 35% of the other two dimensions, or not less than about 40% of the other two dimensions.
  • the inventors have found with a 3D molded cellulose-based object that a cellulose gel can be formed only at the surface of the molded cellulose-based object. A drying step will result in a water and oil repellent smoother surface of the molded cellulose-based object.
  • the gel can, for example, be generated by dipping the molded cellulose-based object into an acid, for example sulfuric acid.
  • an acid for example sulfuric acid.
  • the inventors presently believe that the free hydroxyl groups of the cellulose react with the acid, swelling/dissolving a layer of the depolymerized cellulose.
  • This layer of cellulose can be reprecipitated in form of amorphous cellulose (cellulose II) as a gel, for example, by washing the molded cellulose-based object that was subjected to an acid with water.
  • the resulting molded cellulose-based object comprising the cellulose gel layer can be dried.
  • a moulded cellulose-based object comprising a dried cellulose gel layer results.
  • the dried cellulose gel layer of the moulded cellulose-based object in accordance with the present invention may be obtained by using solubilization/reprecipitation process.
  • the solubilization/reprecipitation process may be carried out with sulfuric acid, for example.
  • one embodiment of the present invention relates to a moulded cellulose-based object comprising a sulfurization layer.
  • the sulfurization layer may be a cellulose gel formed by the treatment of cellulose with sulfuric acid, followed by a washing step and drying step.
  • any moulded cellulose-based object may be provided with a dried cellulose gel layer.
  • a dried cellulose gel layer is very efficient in providing a lipid barrier and/or a liquid barrier, for example a water barrier, to the cellulose-based object, such a dried cellulose gel layer is for example very useful, if the moulded cellulose-based object is a packaging, for example a packaging for food products. In particular it is useful for packaging for food products that have a lipid and/or liquid content.
  • the moulded cellulose-based object may be packaging selected from the group consisting of primary packaging, secondary packaging and tertiary packaging.
  • a primary packaging for a food product may be a packaging for a food product that is in direct contact with the actual food product.
  • a secondary packaging for a food product may be a packaging for a food product that helps secure one or more food products contained in a primary packaging.
  • a secondary material is typically used when multiple food products are provided to consumers in a single container.
  • a tertiary packaging for a food product may be a packaging for a food product that helps secure one or more food products contained in a primary packaging and/or in a primary and secondary packaging during transport.
  • the packaging may be any type of packaging.
  • the inventors propose, in particular, that the packaging may be selected from the group consisting of cups, bottles, trays, capsules, straws, spoons, tips and lids.
  • Moulded cellulose-based objects are usually prepared from cellulose-based pulps, which are then thermoformed into cellulose-based objects.
  • the cellulose based pulps may contain different types of cellulose pulps.
  • the cellulose-based object may comprise comprises cellulose pulp selected from the group consisting of mechanical pulp, recycled paper pulp, bagasse pulp, annual plant pulp, virgin cellulose pulp, refined cellulose pulp, or a combination thereof.
  • the cellulose-based object may also consist of cellulose pulp selected from the group consisting of mechanical pulp, recycled paper pulp, bagasse pulp, annual plant pulp, virgin cellulose pulp, refined cellulose pulp, or a combination thereof.
  • the moulded cellulose-based object in accordance with the present invention may comprise or consist of kraft bleached cellulose.
  • the cellulose-based object for example the cellulose-based pulp may also contain a sizing agent.
  • Sizing agents are well-known in the art.
  • Alkylketene dimer (AKD) and alkenyl succinic anhydride (ASA) are typically used as sizing agents.
  • the inventors have obtained particularly good results when alkylketene dimer (AKD) was used as sizing agent.
  • the cellulose-based object in accordance with the present invention may further comprise AKD.
  • the dried cellulose gel may be the only "coating" layer on the moulded cellulose-based object.
  • the dried cellulose gel layer may be on the inside of the moulded cellulose-based object in direct contact with a food product inside the moulded cellulose-based object.
  • the dried cellulose gel will provide a smooth and non-porous surface and which then may also be furthertreated by coating it with at least one further coating.
  • This further coating may - for example - provide further barrier properties and/or certain desired optical properties.
  • the dried cellulose gel on the moulded cellulose-based object may be a pre-treatment of the surface coated with at least one further coating.
  • the thickness of the dried cellulose gel layer will have an influence on the barrier properties provided by the dried cellulose gel layer. Generally, a thicker gel layer will provide better barrier properties. However, the generation of a thick layer may also require significant gel formation, which may have an impact on the cellulose- based basis material and on the recyclability.
  • the dried cellulose gel layer has a thickness in the range of about 2- to 80 pm, for example of about 5- to 60 pm or of about 10- to 30 pm.
  • the inventors were able to produce moulded cellulose-based objects with an excellent oil resistance, a low air permeability and/or a low water absorbance.
  • the moulded cellulose-based object in accordance with the present invention may have oil resistance in the range of 10 to 12 in a kit test.
  • the kit test is well accepted in the art and is, for example, described in Grease Resistance - Kit Test (TAPPI T559).
  • the Kit test method describes a procedure for testing the degree of repellency of paper treated with sizing agents. This test was originally developed to know when fluorochemical was incorporated and the approximate level of grease resistance imparted. Testing uses a series of numbered reagents with various surface tension onto the surface of the sample. The solutions are numbered from 1 (the least aggressive) to 12 (the most aggressive).
  • the moulded cellulose-based object in accordance with the present invention may have an air permeability in the range of 1 to 0.001 cm 3 /(m 2 -Pa-s).
  • the moulded cellulose-based object in accordance with the present invention may have a water absorbance in a 60 min Cobb test of below 100 g/m 2 .
  • the water absorbance of cellulose-based materials can be determined according to ISO 535.
  • the moulded cellulose-based object in accordance with the present invention may have an oil resistance in the range of 10 to 12 in a kit test; an air permeability in the range of 1 to 0.001 cm 3 /(m 2 -Pa-s), and/or a water absorbance in the range of Cobb 60min below 100 g/m 2 .
  • the moulded cellulose-based object has an oil resistance in the range of 10 to 12 in a kit test an air permeability in the range of 1 to 0.001 cm 3 /(m 2 -Pa-s), and/or water absorbance in the range of Cobb 60min below 100 g/m 2 .
  • the moulded cellulose-based object in accordance with the present invention may be prepared by applying a cellulose gel onto a cellulose-based moulded object and by washing and drying it.
  • the moulded cellulose-based object in accordance with the present invention may be obtainable or obtained by a process comprising the steps of a. dipping a moulded cellulose-based object into a H 2 SO 4 solution, b. washing the moulded cellulose-based object after dipping it into a H 2 SO 4 solution, and c. drying the moulded cellulose-based object after dipping it into a H 2 SO 4 solution and washing it.
  • the H 2 SO 4 solution may be an about 60 - 80 weight-% H 2 SO 4 solution.
  • the moulded cellulose-based object may be dipped into a H 2 SO 4 solution at a temperature at about 3 to 30°C, and more preferably between 3 and 10°C.
  • the dipping of the moulded cellulose-based object into a H 2 SO 4 solution may be carried out for about 1 to 60 seconds.
  • the dipping of the moulded cellulose-based object into the H 2 SO 4 solution may be carried out with an about 60 - 80 weight-% H 2 SO 4 solution at a temperature of about 3 to 30°C for about 1 to 60 seconds.
  • the moulded cellulose-based object may be washed in a washing bath, for example a water bath, optionally assisted by scrubbing.
  • a washing bath for example a water bath
  • the washed moulded cellulose-based object may be further washed in a second washing bath, for example a second water bath.
  • the inventors have obtained very good results, when the drying step was carried out in an oven at elevated temperatures. Accordingly, the inventors recommend that the washed moulded cellulose-based object may be dried in an oven at a temperature in the range of about 50-180°C. this drying step is carried out until the moulded cellulose-based object is sufficiently dry.
  • the sulfurization protocol is presented as follows:
  • the reference molded pulp has a very low value of 1 whereas the sulfurized molded pulp have a value between 9 and 11.
  • a Cobb 60 seconds test was also performed according to ISO 535. Goal of this test is to assess the water absorbance during a given time on a normalized surface. Results are summarized in the table below:
  • This cellulose gel layer could also play the role of a pre-treatment which favour the deposition of a barrier layer dispersion. Indeed, the surface is already closed and smoother after the gel formation and it is easier to top coat a barrier layer on it. The coating layer is not anymore adsorbed by the porous molded cellulose.
  • each barrier coating is about 15gsm. After one layer, we obtain a kit value of 1 without pretreatment whereas we can reach already 12 with only one barrier coating after the sulfurization pretreatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne généralement le domaine des objets tridimensionnels à base de cellulose, par exemple des matériaux d'emballage à base de cellulose. En particulier, la présente invention concerne des objets moulés à base de cellulose ayant une surface fonctionnalisée, par exemple une surface qui réduit l'absorption d'eau. Un mode de réalisation de la présente invention concerne un objet moulé à base de cellulose comprenant une couche de gel de cellulose. Par exemple, la couche de gel de cellulose peut être obtenue par sulfuration.
EP21783320.1A 2020-10-13 2021-10-07 Gel de cellulose pour objets 3d Pending EP4229238A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20201444 2020-10-13
PCT/EP2021/077726 WO2022078869A1 (fr) 2020-10-13 2021-10-07 Gel de cellulose pour objets 3d

Publications (1)

Publication Number Publication Date
EP4229238A1 true EP4229238A1 (fr) 2023-08-23

Family

ID=72852416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21783320.1A Pending EP4229238A1 (fr) 2020-10-13 2021-10-07 Gel de cellulose pour objets 3d

Country Status (4)

Country Link
US (1) US20230374735A1 (fr)
EP (1) EP4229238A1 (fr)
CA (1) CA3193441A1 (fr)
WO (1) WO2022078869A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4389970A1 (fr) * 2022-12-23 2024-06-26 Ahlstrom Oyj Substrat recyclable à base de cellulose comprenant des fibres cellulosiques et une matière cellulosique non fibreuse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737228B1 (fr) 1995-07-24 1997-09-05 Sibille Dalle Papier sulfurise couche et son procede de fabrication
FR3092345A1 (fr) * 2019-08-26 2020-08-07 Serge Schlee Procédés de fabrication d'un produit hydrophobe en pâte ou papier sulfurisé biodégradable et compostable.

Also Published As

Publication number Publication date
CA3193441A1 (fr) 2022-04-21
US20230374735A1 (en) 2023-11-23
WO2022078869A1 (fr) 2022-04-21

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