WO2023248099A1 - Film barrière pour substrat à base de cellulose et procédé de fabrication d'un film barrière - Google Patents

Film barrière pour substrat à base de cellulose et procédé de fabrication d'un film barrière Download PDF

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Publication number
WO2023248099A1
WO2023248099A1 PCT/IB2023/056318 IB2023056318W WO2023248099A1 WO 2023248099 A1 WO2023248099 A1 WO 2023248099A1 IB 2023056318 W IB2023056318 W IB 2023056318W WO 2023248099 A1 WO2023248099 A1 WO 2023248099A1
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WIPO (PCT)
Prior art keywords
layer
mfc
barrier film
film according
pattern
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Application number
PCT/IB2023/056318
Other languages
English (en)
Inventor
Kaj Backfolk
Isto Heiskanen
Jukka Kankkunen
Adrianna SVENSSON
Original Assignee
Stora Enso Oyj
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Publication of WO2023248099A1 publication Critical patent/WO2023248099A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/08—Corrugated paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/04—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a layer being specifically extensible by reason of its structure or arrangement, e.g. by reason of the chemical nature of the fibres or filaments
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • D21H27/02—Patterned 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • 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
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B65D65/403—Applications of laminates for particular packaging purposes with at least one corrugated layer
    • 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
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B65D65/406—Applications of laminates for particular packaging purposes with at least one layer provided with a relief other than corrugations
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/14—Gas barrier composition

Definitions

  • An effective gas and/or aroma barrier and particularly oxygen barrier is required in packaging industry for shielding products that are oxygensensitive, thereby extending their shelf-life. These include many food products, in particular, but also pharmaceutical products and electronic industry products.
  • Known packaging materials with oxygen barrier properties may be comprised of one or several polymer films or of a fibrous paper or board coated with one or several layers of an oxygen barrier polymer, usually as part of a multilayer coating structure.
  • MFC microfibrillated cellulose
  • Such films may be made by applying an MFC suspension on a porous substrate forming a wet web or film followed by dewatering of the web by draining water through the substrate for forming the film. This can be accomplished e.g. by use of a paper- or paperboard machine type of process.
  • US201229839A teaches a method of manufacturing of an MFC film by applying a furnish comprising MFC directly on porous substrate thus allowing the MFC to be dewatered and filtered.
  • the film can be made by use of casting technologies, including applying an MFC dispersion onto a non-porous cast substrate, such as a polymeric or metal substrate, and drying said film by evaporation.
  • the publication EP 2771390 A4 describes preparation of MFC films, in which an aqueous cellulose nanofiber dispersion is coated on a paper or polymeric substrate, dried and finally peeled off as a nanofiber film sheet.
  • Fibrillating of cellulose fibers into MFC results in that certain properties are lost. Examples include reduced tear strength and poor elasticity. This causes problems upon lamination and/or converting operations since MFC films tend to break and tear which destroys the barrier function.
  • Films made from MFC thus often comprise quite a large amount of plasticizers in order to exhibit the required stretchability. There is however a need to limit the amount of plasticizers, especially in films to be used in connection with food packages in order to comply with stipulated laws and regulations.
  • a high amount of plasticizers may deteriorate the barrier properties of the MFC film.
  • a barrier film for a cellulose- based material comprising at least one microfibrillated cellulose layer (MFC layer), which MFC layer in its turn comprises a three-dimensional (3D) pattern, and wherein said MFC layer further comprises:
  • OTR. oxygen transfer rate below 500 cc/m2/24h/atm, measured according to the standard ASTM F1927-20 at 50 percent relative humidity and 23°C.
  • the 3D pattern is arranged to provide an improved elongation at break (strain at break) compared to a corresponding MFC layer void of such a 3D pattern.
  • said 3D pattern is a micro-scale 3D pattern.
  • 3D-patterns include discrete patterns, continuous patterns, undulations including spots, corrugated pattern, ridges, furrows, crests, peaks and valleys, grids, recesses, depressions, indentations, cavities, sags, knobs and imprints.
  • cellulose-based substrate herein refers to e.g. a paper or paperboard material or any other cellulose-based sheet, web and/or fiber article including e.g. 3D-shaped trays or bowls. It is further understood that “micro-scale” refers to dimensions ranging from 0.1-1500pm.
  • an MFCbased film that provides gas-, oil-, grease- and aroma barrier function which thanks to its improved stretchability may be subjected to lamination and converting operations with low risk of tearing and/or breaking, and thus retaining a good barrier function even after such lamination/converting.
  • said MFC layer provided with a three-dimensional (3D) pattern has a thickness between 10-1000 pm, such as between 10-250 pm. Said thickness may be measured with standard method or with microscope such as cross section imaging.
  • said 3D pattern has a neighboring peak-to-valley distance in a machine direction of the film in the interval of 0.1-1500pm.
  • the MFC layer comprises at least 50 wt%, preferably at least 70 wt%, more preferably at least 80 wt% MFC, based on the total dry weight of the MFC layer.
  • the barrier film according to the invention comprises only said MFC layer.
  • the barrier film may also comprise further additional layers.
  • the barrier film may comprise at least a second MFC layer.
  • Such a barrier film i.e. comprising a double MFC film layer
  • such a barrier film comprises a first MFC layer with a basis weight between 10-40 gsm, and a second MFC layer comprising a basis weight between 5-30 gsm.
  • one layer in said barrier film may be based on refined pulp with an SR. value between 20-40°.
  • the MFC layer comprises PVOH in an amount between 2-50wt%, preferably 4-40wt% or 4-30wt% of the total weight of the MFC film.
  • PVOH has a degree of hydrolysis between 85-100 such as 88-99 mol%.
  • the PVOH may also be modified with ethylene-, silanol-, or carboxyl groups.
  • said MFC layer has a KIT value of the barrier film of at least 10, preferably 12, as measured according to standard ISO 16532-2.
  • said MFC layer comprises less than 10 pinholes/m2, preferably less than 8 pinholes/m2, more preferably less than 2 pinholes/m2, as measured according to standard EN13676:2001.
  • said MFC layer has a water vapor transmission rate (WVTR) >50, preferably >100 at 23°C and 50% relative humidity according to ASTM F-1249.
  • the present invention also relates to a method for manufacturing a barrier film comprising at least one layer of microfibrillated cellulose (MFC). Said method comprises at least the steps of:
  • the wet layer is a wet web layer.
  • Fig. 1 shows a schematic principle of operation of Clupac compaction method.
  • Microfibrillated cellulose shall in the context of the patent application be understood to mean a nano scale cellulose particle fiber or fibril with at least one dimension less than 1000 nm.
  • MFC comprises partly or totally fibrillated cellulose or lignocellulose fibers.
  • the liberated fibrils typically have a diameter less than 1000 nm, whereas the actual fibril diameter or particle size distribution and/or aspect ratio (length/width) depends on the source and the manufacturing methods.
  • a coarse MFC grade might contain a substantial fraction of fibrillated fibers, i.e. protruding fibrils from the tracheid (cellulose fiber), and with a certain amount of fibrils liberated from the tracheid (cellulose fiber).
  • MFC cellulose microfibrils, fibrillated cellulose, nanofibrillated cellulose, fibril aggregates, nanoscale cellulose fibrils, cellulose nanofibers, cellulose nanofibrils, cellulose microfibers, cellulose fibrils, microfibrillar cellulose, microfibril aggregates and cellulose microfibril aggregates.
  • MFC can also be characterized by various physical or physical-chemical properties such as its large surface area or its ability to form a gel-like material at low solids (for example, 1- 5 wt%) when dispersed in water.
  • MFC multi-pass refining
  • pre-hydrolysis followed by refining or high shear disintegration or liberation of fibrils.
  • One or several pre-treatment steps are usually required in order to make MFC manufacturing both energy efficient and sustainable.
  • the cellulose fibers of the pulp to be utilized may thus be pre-treated, for example enzymatically or chemically, to hydrolyse or swell the fibers or to reduce the quantity of hemicellulose or lignin.
  • the cellulose fibers may be chemically modified before fibrillation, such that the cellulose molecules contain other (or more) functional groups than found in the native cellulose.
  • Such groups include, among others, carboxymethyl (CMC), aldehyde and/or carboxyl groups (cellulose obtained by N-oxyl mediated oxidation, for example "TEMPO”), quaternary ammonium (cationic cellulose) or phosphoryl groups. After being modified or oxidized in one of the above-described methods, it is easier to disintegrate the fibers into MFC or nanofibrils.
  • the nanofibrillar cellulose may contain some hemicelluloses, the amount of which is dependent on the plant source.
  • Mechanical disintegration of the pre-treated fibers, e.g. hydrolysed, pre-swelled, or oxidized cellulose raw material is carried out with suitable equipment such as a refiner, grinder, homogenizer, colloider, friction grinder, ultrasound sonicator, fluidizer such as microfluidizer, macrofluidizer or fluidizer-type homogenizer.
  • suitable equipment such as a refiner, grinder, homogenizer, colloider, friction grinder, ultrasound sonicator, fluidizer such as microfluidizer, macrofluidizer or fluidizer-type homogenizer.
  • the product might also contain fines, or nanocrystalline cellulose, or other chemicals present in wood fibers or in papermaking process.
  • the product might also contain various amounts of micron size fiber particles that have not been efficiently fibrillated.
  • MFC is produced from wood cellulose fibers, both from hardwood and softwood fibers. It can also be made from microbial sources, agricultural fibers such as wheat straw pulp, bamboo, bagasse, or other non-wood fiber sources. It is preferably made from pulp including pulp from virgin fiber, e.g. mechanical, chemical and/or thermomechanical pulps. It can also be made from broke or recycled paper.
  • OTR. oxygen transmission rate as used in the patent claims and in the description is measured in accordance with (ASTM F1927-20, in 24 hours at 23°C, 50% R.H.
  • Plasticizers as used herein is meant additives that increase the plasticity of the film.
  • Plasticizers used in the process of the invention can e.g. be chosen from the group of sugar alcohols such as sorbitol, xylitol polyols, glycerol, or polyethers such as polyethylene glycol (PEG), cellulose derivatives such as carboxy methyl cellulose (CMC), low molecular weight cellulose derivatives, or polysaccharides such as dextrin, or a combination of any of these.
  • sugar alcohols such as sorbitol, xylitol polyols, glycerol, or polyethers
  • PEG polyethylene glycol
  • CMC carboxy methyl cellulose
  • low molecular weight cellulose derivatives such as dextrin, or a combination of any of these.
  • film refers generally to a thin continuous sheet formed material. Depending on the composition of the pulp suspension, the film can also be considered as a thin paper or even as a membrane.
  • the layer is dried to a final moisture content preferably of between 0.1 - 20wt% to form said barrier film.
  • the dewatering/drying of the barrier film may be accomplished by noncontact drying using e.g. hot air, steam, impingement drying, IR. or microwaves or by contact drying.
  • said MFC layer is arranged in a three- dimensional (3D) pattern such as in a microscale 3D pattern, preferably microcreped pattern. Thanks hereto, an improved stretchability may be obtained with only a limited amount (such as less than 10wt% based on total solid amount), or no addition of plastic additives or plasticizers.
  • the method of the invention also enables the use of different kind of fibers in different additional layers (in addition to the MFC layer), which opens up the possibility to build up an optimized barrier structure.
  • the MFC layer comprises a 3D pattern which makes the layer more flexible and/or stretchable.
  • One particularly suitable alternative is creping and/or microcreping. Any previously known creping process may be used without departing from the scope of the present disclosure. Creping is a process wherein a layer or film is provided with densely distributed small wrinkles/undulations/compactions resulting in some degree of shortening the film during the process. It can be made by doctoring (using a creping blade) a moist fiber- or MFC-containing web from a supporting cylinder.
  • a suitable alternative is dry creping wherein the web is substantially dry, for example having a solid content between 90-95wt%.
  • a suitable solid content of the film is at least 50wt%, such as between 65-95wt%.
  • Creping increases the elongation or stretch compared to a corresponding non-creped film or layer.
  • the creping may suitably be made to provide wrinkles or undulations of a size in the range of microns, so called microcreping. It is also plausible to perform creping such as to provide wrinkles or undulations of a size in the range of millimetres. Creping of the film is made before the film is used in a laminated structure.
  • the crepe ratio of the creped barrier film is 5-70%, or 7- 35% or 7-30%, wherein "crepe ratio" is a measure of how much the film has shortened during creping treatment.
  • -Clupak® method is an in-plane compacting treatment of moist fiber layer resulting in improved extensibility of the material.
  • a schematic principle of operation of Clupak compaction unit is seen in Fig. 1.
  • an MFC layer 1 is fed into the junction between a nip roll 3 and a heated steel drying cylinder 4.
  • a rubber blanket 2 is moving along with the MFC layer and is compressed between the nip roll 3 and the drying cylinder 4 with a certain pressure P. Said rubber blanket 2 is stretched before entering the junction S, and before contacting the MFC layer 1. Once the rubber blanket 2 and the MFC layer 1 passes the nip 3, the rubber blanket 2 recoils since the straining force is released.
  • the adhesion to the metal surface can be adjusted by using adhesive and release agents.
  • the metal belt comprises a temperature between 120-250°C to warm up the substrate.
  • the waves obtained by means of creping the material is in microscale, preferably with a wavelength below 1500pm, or below 1200pm.
  • the MFC layer has a grammage between 25-50 gsm before subjected to patterning treatment.
  • the barrier film according to the invention may be used in a multilayer laminate.
  • the film may be applied onto a fibrous base, such as a paper, paperboard or cardboard made of semichemical, chemical- termomechanical, chemical or (chemi-) mechanical pulp.
  • a water based adhesive or extruded tie layer can be used to provide adhesion between the MFC layer and the substrate.
  • the paper or paperboard can further be surface sized, or a dispersion barrier may be coated on at least one side.
  • the paperboard is coated on the print side with a mineral coating and then on inside with at least one dispersion barrier coating layer such as starch, styrene/acrylate latex, CMC or PVOH based coating.
  • the fibrous base is paperboard of a weight of 130 to 450 g/m2, preferably of 170 to 250 g/m2, or paper of a weight of 40 to 130 g/m2.
  • the laminate may further comprise polymer layers, e.g. of polyethylene, or further barrier layers. Such laminates are useful e.g. for heat-sealable packages of food or liquids.
  • the barrier film according to the invention may be laminated with paper or paperboard using e.g. water based adhesive or extruded tie layer. Examples of such structures include:
  • thermoplastic layers is preferably added on the print side of a material, opposite the barrier film side.
  • the thermoplastic layers may be extruded of dispersion coated.
  • the barrier film according to the invention i.e. including an MFC layer arranged in a 3D pattern where such 3D pattern improves elasticity of the layer, is as such useful for materials intended for packaging foods or liquids, with or without coating and/or as part of a laminate.
  • the barrier film is suitable as a direct food contact wrapping material or laminate. Such wrapping materials for food contact have good grease resistance and the 3D pattern will also provide the desired flexibility that is required for wrapping purposes.
  • the barrier film according to the invention may also be used for PET food packaging, dry snacks and/or cereals.
  • the method according to the invention includes at least the following steps:

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un film barrière pour un matériau à base de cellulose, ledit film barrière comprenant au moins une couche de cellulose microfibrillée (couche CMF), ladite couche CMF comprenant un motif tridimensionnel (3D).
PCT/IB2023/056318 2022-06-22 2023-06-19 Film barrière pour substrat à base de cellulose et procédé de fabrication d'un film barrière WO2023248099A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2230203A SE2230203A1 (en) 2022-06-22 2022-06-22 A barrier film for a cellulose-based substrate and a method of manufacturing a barrier film
SE2230203-8 2022-06-22

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WO2023248099A1 true WO2023248099A1 (fr) 2023-12-28

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200023409A1 (en) * 2017-01-30 2020-01-23 Stora Enso Oyj Method of manufacturing a film comprising microfibrillated cellulose
WO2020161390A1 (fr) * 2019-02-07 2020-08-13 Teknologian Tutkimuskeskus Vtt Oy Fabrication d'un film à motifs à base de cellulose
KR20210068641A (ko) * 2019-11-29 2021-06-10 한국생산기술연구원 공용매 시스템을 이용하는 현탁 공정 및 용융 공정을 포함하는 열가소성 수지/셀룰로오스 나노섬유 나노복합체의 제조방법
WO2021130669A1 (fr) * 2019-12-23 2021-07-01 Stora Enso Oyj Film nanocellulosique repoussant les liquides à motifs
EP3864074A1 (fr) * 2018-10-08 2021-08-18 Stora Enso Oyj Couche barrière comprenant de la cellulose de dialdéhyde microfibrillée
JP2023010374A (ja) * 2021-07-09 2023-01-20 王子ホールディングス株式会社 包装材、包装体、及び包装材の製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200023409A1 (en) * 2017-01-30 2020-01-23 Stora Enso Oyj Method of manufacturing a film comprising microfibrillated cellulose
EP3864074A1 (fr) * 2018-10-08 2021-08-18 Stora Enso Oyj Couche barrière comprenant de la cellulose de dialdéhyde microfibrillée
WO2020161390A1 (fr) * 2019-02-07 2020-08-13 Teknologian Tutkimuskeskus Vtt Oy Fabrication d'un film à motifs à base de cellulose
KR20210068641A (ko) * 2019-11-29 2021-06-10 한국생산기술연구원 공용매 시스템을 이용하는 현탁 공정 및 용융 공정을 포함하는 열가소성 수지/셀룰로오스 나노섬유 나노복합체의 제조방법
WO2021130669A1 (fr) * 2019-12-23 2021-07-01 Stora Enso Oyj Film nanocellulosique repoussant les liquides à motifs
JP2023010374A (ja) * 2021-07-09 2023-01-20 王子ホールディングス株式会社 包装材、包装体、及び包装材の製造方法

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