Classifications

• • 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
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/10—Coatings without pigments
  • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
  • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H19/22—Polyalkenes, e.g. polystyrene
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/38—Coatings with pigments characterised by the pigments
• • 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
  • D21H19/38—Coatings with pigments characterised by the pigments
  • D21H19/385—Oxides, hydroxides or carbonates
• • 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
  • D21H19/38—Coatings with pigments characterised by the pigments
  • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
• • 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
  • 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
  • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
• • 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
  • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/80—Paper comprising more than one coating
  • D21H19/82—Paper comprising more than one coating superposed
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/80—Paper comprising more than one coating
  • D21H19/82—Paper comprising more than one coating superposed
  • D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H19/00—Coated paper; Coating material
  • D21H19/80—Paper comprising more than one coating
  • D21H19/84—Paper comprising more than one coating on both sides of the substrate
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/16—Sizing or water-repelling agents
• • 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
  • D21H21/50—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 form
  • D21H21/52—Additives of definite length or shape
• • 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 the field of packaging papers.
• Plastic films are widely used in flexible packagings since they possess water vapour barrier properties necessary for the proper preservation of perishable products or products that have a limited shelf life.
• Papers are materials manufactured from fibres, generally cellulosic fibres, therefore of plant origin. They are naturally porous and permeable to gases and cannot, as is, be used for this application.
• Packagings made from barrier papers manufactured on-line are described in application WO 2011/056130.
• On-line manufacture is understood to mean the manufacture on a single production tool comprising all the elements required for the production of the paper.
• the barrier level proposed is limited to measurement conditions that are not very restrictive (that are temperate, i.e. 25° C., 75% relative humidity).
• the barrier level is measured by a water vapour permeability, a weak barrier signifying a high water vapour permeability. It is known in the literature that “tropical” conditions (i.e. 38° C., 90% relative humidity) are much harsher than temperature conditions, and that therefore the barrier measured under temperate conditions is much weaker.
• carrier paper should be understood to mean a non-porous paper, comprising a fibrous substrate covered with one or more layers, which is sufficiently leaktight to water vapour to withstand the penetration thereof into the packaging, in an amount capable of adversely affecting the preservation of the product or the integrity of the product contained inside.
• the invention is interested in particular, but not exclusively, in water vapour barrier papers having a water vapour permeability of at most 150 g/m 2 /24 h and, preferably, of less than 100 g/m 2 /24 h, measured according to the ASTM F1249 standard under so-called tropical conditions of 38° C. and 90% relative humidity.
• barrier paper it is advantageous for the barrier paper to also be heat-sealable, in order to allow the formation of the packaging by sealing the paper to itself.
• the manufacture of heat-sealable papers involves, for example, laying a covering layer of a heat-sealing polymer on a cellulosic substrate.
• a covering layer has a quite strong tackiness when not dry, and must be able to be dried completely before the paper is wound on itself, to avoid the various turns of the reel sticking to one another.
• this covering layer is generally carried out off-line during one or more conversion steps, which makes it possible to have a good coating quality, to benefit from a paper at ambient temperature at the time of the coating which enables the covering layer not to penetrate excessively in the fibrous support, and to be able to adapt the transit time of the reel width in the ovens, to a speed for example of the order of 200 m/min, so that the time of exposure to these heating means is sufficient to completely dry, in depth, the heat-sealing covering layer.
• the papers that offer a barrier to water vapour and that are optionally heat-sealing are generally manufactured in the prior art during conversion operations and conventionally have covering layers of 10 to 30 g/m 2 when dry which are deposited as one or more thicknesses using various coating means (air knife, reverse gravure, Meyer rod or bar or any other coating method) or by the application of one thick layer using curtain coating.
• the invention relates to the development of a paper endowed, during its on-line manufacture, with water vapour barrier and heat-sealability properties.
• This barrier and heat-sealing paper may be used for manufacturing packaging by sealing the paper to itself.
• the problem is faced of facilitating the deposition of the heat-sealing layer and more generally of any covering layer, heat-sealing or not, applied to a fibrous substrate.
• the covering layer It is generally desirable for the covering layer not to penetrate too deeply into the fibrous substrate, in order to reduce the amount applied to the paper when this layer is polymer-based. Furthermore, a lesser penetration of the covering layer makes it possible to more easily create a barrier film.
• a second option is the use of a calender before any treatment of the paper.
• Another option is to make provision for the presence of a precoat layer in order to reduce the porosity of the paper.
• Another option is to combine one or other of the preceding options.
• Use may be made, in the formulation of the precoat layer, of certain hydrophobic and highly film-forming latices.
• the hydrophobic nature of the precoat layer may then pose a problem of wettability during the application of the covering layer, when the latter is aqueous, resulting in a not perfectly homogeneous covering of the precoated fibrous substrate by the covering layer, especially in the case of an on-line process with a high speed of the sheet.
• the surface energy of the precoat layer must be sufficiently different from that of the covering layer while complying with the well-known rules of wettability in order to reduce the risk of wetting defects.
• the invention meets this need, according to one of its aspects, owing to a paper comprising:
• a platy filler having a shape factor of at least 15 and of a finer, in particular non-platy, particulate filler the size of the particles of which is, for 80% by weight, less than 2 ⁇ m (measured according to the ISO 13317-3 SediGraph method), makes it possible to obtain a relatively high barrier level, independently of the hydrophobic or non-hydrophobic nature of the binder.
• platy fillers help to increase the barrier effect owing to the tortuosity that they provide, as taught for example by the document Imerys Technical Guide, Pigments for Paper, May 2008.
• the presence according to this aspect of the invention of at least one finer, in particular non-platy, particulate filler increases this effect.
• This filler by slipping between the platy particles, obstructs the movement of the water molecules even more, in particular around the platy particles.
• the document WO 2009/117040 A1 discloses platy fillers of clay.
• the invention makes it possible to have a reinforced barrier effect with the precoat layer, which allows a reduction in the amount of covering layer to be applied or, for an equal amount of covering layer, makes it possible to further increase the barrier level of the paper, which may prove useful for papers that have to be leaktight to water vapour.
• the reduction in the amount of covering layer needed owing to the greater barrier power of the precoated paper, facilitates the drying thereof and may make the coating of this layer easier during the on-line manufacture of the paper.
• the paper of the invention is preferably produced on a papermaking machine from a fibrous substrate consisting of cellulose fibres and optionally of synthetic fibres.
• the cellulose fibres are in general a mixture of short fibres and long fibres.
• Additives such as sizing agents, wet strength agents, retention agents or antifoams may be added.
• the paper may also contain papermaking fillers such as titanium dioxide, kaolin, calcium carbonate and talc, inter alfa.
• the paper is preferably a packaging paper.
• Another subject of the invention is a precoated paper suitable for the manufacture of a barrier paper according to the invention as defined above, having a water vapour permeability of at most 150 g/m 2 /24 h and preferably of less than 100 g/m 2 /24 h according to the aforementioned standard.
• the precoated paper may be uncalendered.
• Another subject of the invention is a precoating composition for the manufacture of a paper according to the invention, comprising a binder in latex form and a dispersion of a mixture of platy filler(s) having a shape factor of at least 15 and of finer filler(s), the size of the particles of which is, for 80% by weight, less than 2 ⁇ m.
• Another subject of the invention is a packaging comprising a paper according to the invention, in particular heat-sealed to itself and containing for example a food product.
• Another subject of the invention is a process for manufacturing a paper according to the invention, in which the precoating composition as defined above is applied to a fibrous substrate.
• the precoat layer may be identical to the covering layer or be a pigment layer as defined below.
• the precoat layer preferably consists of a mixture of at least one latex and of fillers also sometimes referred to as “pigments”.
• the latex according to the invention preferably has a Tg (glass transition temperature) measured according to the ASTM E1356 standard of below 25° C. and more preferably of below 10° C.
• the latex may be selected from the latices of the following chemical natures: styrene-butadiene, styrene-acrylic, acrylic, butyl acrylate, butyl acrylate-styrene-acrylonitrile, etc., and more particularly from styrene-butadiene emulsions.
• the amount of latex is preferably at least 15 parts when dry relative to the fillers when dry (100 parts), preferably at least, or even more than, 25 and better still 30 parts per hundred parts of filler.
• the fillers are preferably constituted by a mixture of platy filler(s) and finer, in particular non-platy, fillers.
• the platy filler(s) are particles in the form of lamellae having a shape factor (ratio between greatest length and thickness) of greater than or equal to 15, more preferably of at least 40 and more preferably still of at least 60.
• the precoat layer comprises a binder and a mixture of platy filler(s) having a shape factor of at least 15 and of finer filler(s), notably non-platy filler(s), the size of the particles of which is, for 80% by weight, less than 2 ⁇ m (measured according to the ISO 13317-3 SediGraph method).
• the size of the particles of the platy filler(s) may for example be, for 80% by weight, greater than or equal to 2 ⁇ m.
• less than 80% by weight of the platy particles may be less than 2 ⁇ m.
• the finer fillers may, according to a first example, have a particles size lower than that of the platy fillers at equivalent weight distribution. According to a second example they can have a weight distribution greater for a same size of particles than that of the platy fillers.
• the finer fillers may be selected from all the other pigments used in papermaking, which meet the required size conditions.
• the percentage of platy fillers relative to the sum of the fillers may vary from 10% to 90%, preferably from 40% to 90% and more preferably still from 60% to 90%.
• the platy fillers may be selected, for example, from kaolin and talc, and mixtures thereof. Between 30% and 80% by weight of platy particles may be of size less than or equal to 2 ⁇ m (measured according to the ISO 13317-3 SediGraph method).
• the particles of the platy filler(s) are in particular oriented substantially parallel to the surface of the substrate.
• the particles of the finer filler(s) may be selected from calcium carbonate, barium sulphate, silica, titanium dioxide and mixtures thereof, etc. They are characterized by a particle size, for 80% by weight, of less than 2 microns, measured according to the ISO 13317-3 SediGraph method.
• the finer fillers may also be selected from any other pigment, including kaolin, having a sufficient fineness, in particular a particle size, for 95% by weight, of less than 2 microns, measured according to the ISO 13317-3 SediGraph method.
• the binder is preferably selected from the aforementioned latices but other binders or co-binders such as PVOH, starch, CMC, etc. may be used.
• the binder may comprise a polymer of chemical nature not present in the covering layer.
• the polymers used to obtain the vapour barrier and the heat-sealability are preferably selected from polymers or copolymers based on PVdC (polyvinylidene chloride) or acrylic.
• polymers are applied pure or as a mixture with fillers.
• the term “pure” is understood to mean without particulate filler.
• Other products may optionally be added to the dispersion of polymers such as pH control agents, rheological (for example viscosifying) agents, antifoaming agents, wettability agents, etc.
• fillers within the covering layer may in particular help to reduce the risk of turns of the reel sticking to one another.
• the covering layer is applied on-line.
• the invention makes it possible to obtain good water vapour barrier levels with weights of covering layer that do not exceed 10 g/m 2 when dry.
• the on-line coating of a composition intended to form the heat-sealing covering layer is possible, on condition that sufficient drying capacity is used to dry the layer before the winding operation.
• a relatively low weight of covering layer may facilitate the on-line drying, while providing sufficient barrier properties.
• the on-line process makes it possible to increase the productivity by eliminating the handling operations linked to the off-line treatment.
• the paper sheet After drying the fibrous substrate, the paper sheet may pass on to a Yankee cylinder in order to improve the surface finish of the sheet and thus the distribution of the first layer.
• the sheet may then be treated in a size press or any other equipment of the same type.
• a pigment composition may be used beforehand in order to carry out “pore filling”.
• This pore-filling composition may contain up to 20 parts when dry, relative to the fillers when dry, of binder such as latex, of styrene-butadiene chemical nature for example, and up to 20 parts when dry, relative to the dry pigments, of co-binders such as starch for example.
• binder such as latex, of styrene-butadiene chemical nature for example
• co-binders such as starch for example
• This composition preferably contains fillers which have a size generally of less than 2 microns. These fillers may be selected, inter alfa, from kaolins or calcium carbonates or mixtures thereof.
• the precoat layer is applied to the support thus treated using any of the coating techniques that may be encountered on papermaking machines. This may in particular be blade coating, rotogravure coating, reverse gravure coating or Meyer rod coating.
• the precoat layer is deposited with a dry layer weight preferably of between 4 and 12 g/m 2 .
• This precoat layer is then dried without contact by one or more infrared ovens and/or one or more hot air ovens.
• a Bekk level of 150 seconds is sufficient (measured according to the ISO 5627 standard).
• the water vapour barrier and heat-sealing covering layer is applied by coating using any of the coating techniques that may be encountered on papermaking machines. This may for example be blade coating, rotogravure coating, reverse gravure coating or Meyer rod coating.
• the covering layer is deposited with a dry layer weight preferably of 10 g/m 2 at most.
• This covering layer is then sufficiently dried, to prevent the turns from sticking on the winding reel, using one or more infrared ovens and/or one or more hot air ovens.
• Coating may be carried out on the opposite face in order to strengthen the barrier and/or in order to provide other functionalities such as printability, curl correction, etc.
• the paper thus produced may optionally be calendered on-line in order to reduce the surface roughness before being wound.
• the final basis weight of the paper may be between 45 and 200 g/m2.
• the barrier to water vapour measured according to the ASTM F1249 standard at 38° C. and 90% relative humidity is less than 150 g/m 2 /24 h, and preferably less than 100 g/m 2 /24 h.
• a fibrous support having a basis weight of 55 g/m 2 is produced on a papermaking machine operating at 400 m/min.
• the papermaking machine is equipped with a Yankee cylinder placed before the size press.
• the fibrous support is firstly glazed then treated on-line on both its faces by a size press with a pore-filling pigment composition, containing 100 dry parts of kaolin of Amazon Premium type (Cadam), and a mixture of Merifilm 104 starch (Tate&Lyle) and of latex of DL950 type (Dow) in a proportion of 20 dry parts relative to the dry kaolin.
• the treatment applied is 5 g/m 2 when dry in total.
• the particles size, for 97% by weight, of Amazon Premium, measured according to the IS013317-3 SediGraph method, is less than 2 microns.
• the shape factor of the Capim NP particles is 28.
• the barrier to water vapour is measured by a Mocon Permatran 3/61 machine according to the ASTM F1249 standard at 38° C. and 90% relative humidity in order to determine the barrier contribution of this precoat layer. It is measured at 334 ⁇ 13 g/m 2 /24 h. After coating with the covering layer, a barrier is obtained of less than 150 g/m 2 /24 h.
• the fibrous support is firstly glazed then treated on-line on both its faces by a size press with a pore-filling pigment composition, containing 100 dry parts of kaolin of Amazon Premium type (Cadam), and a mixture of Merifilm 104 starch (Tate&Lyle) and of latex of DL950 type (Dow) in a proportion of 20 dry parts relative to the dry kaolin.
• the treatment applied is 5 g/m 2 when dry in total.
• the particles size, for 95% by weight, of Hydrocarb 95, measured according to the ISO13317-3 SediGraph method, is less than 2 microns.
• the barrier to water vapour is measured by a Mocon Permatran 3/61 machine according to the ASTM F1249 standard at 38° C. and 90% relative humidity in order to determine the barrier contribution of this precoat layer. It is measured at 315 ⁇ 9 g/m 2 /24 h. After coating with the covering layer, a barrier is obtained of less than 150 g/m 2 /24 h.
• a paper is produced on-line under the same conditions as in Example 1. But following the deposition of the precoat layer, it is coated on-line with a covering layer consisting of a dispersion of PVdC copolymer (Diofan A297 from Solvay), and dried without contact in an infrared oven then a hot air oven. It is then wound on a reel with no other treatment and no bonding between turns is observed.
• the dry weight of the covering layer is 6.5 g/m 2 .
• the barrier to water vapour is measured by a Mocon Permatran 3/61 machine according to the ASTM F1249 standard at 38° C. and 90% relative humidity. It is measured at 21.0 ⁇ 2.4 g/m 2 /24 h.
• the sealing is then simulated on a laboratory heat-sealing machine by bonding the face covered with the covering layer to itself at 110° C., under 3 bar and for 0.5 second.
• the force necessary for detaching papers bonded to samples having a width of 15 mm is subsequently measured under an angle of 90 degrees according to the Tappi T540 standard at a speed of 100 mm/min.
• the invention may have one or more of the following advantageous features:

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Dispersion Chemistry (AREA)
• Paper (AREA)
• Wrappers (AREA)

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Cited By (13)

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• 2014
  • 2014-07-30 FR FR1457368A patent/FR3024467B1/fr active Active
• 2015
  • 2015-07-29 FI FIEP15752945.4T patent/FI3186442T4/en active
  • 2015-07-29 EP EP15752945.4A patent/EP3186442B2/fr active Active
  • 2015-07-29 JP JP2017526012A patent/JP2017524081A/ja active Pending
  • 2015-07-29 CA CA2956766A patent/CA2956766A1/fr not_active Abandoned
  • 2015-07-29 BR BR112017001817-9A patent/BR112017001817B1/pt active IP Right Grant
  • 2015-07-29 WO PCT/EP2015/067438 patent/WO2016016340A1/fr not_active Ceased
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• 2020
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