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EP3186441B1 - Verfahren zur herstellung von heisssiegelbarrierepapier - Google Patents

Verfahren zur herstellung von heisssiegelbarrierepapier Download PDF

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Publication number
EP3186441B1
EP3186441B1 EP15750659.3A EP15750659A EP3186441B1 EP 3186441 B1 EP3186441 B1 EP 3186441B1 EP 15750659 A EP15750659 A EP 15750659A EP 3186441 B1 EP3186441 B1 EP 3186441B1
Authority
EP
European Patent Office
Prior art keywords
paper
layer
filler
equal
covering layer
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.)
Active
Application number
EP15750659.3A
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English (en)
French (fr)
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EP3186441A1 (de
Inventor
Laurent Schildknecht
Séverine SCHOTT
Pascale Escaffre
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.)
Ahlstrom Munksjo Oyj
Original Assignee
Ahlstrom Munksjo Oyj
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Application filed by Ahlstrom Munksjo Oyj filed Critical Ahlstrom Munksjo Oyj
Priority to SI201531122T priority Critical patent/SI3186441T1/sl
Publication of EP3186441A1 publication Critical patent/EP3186441A1/de
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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • 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
    • 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
    • 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
    • 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
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • 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
    • D21H27/16—Pure paper, i.e. paper lacking or having low content of contaminants

Definitions

  • the present invention relates to the field of packaging papers.
  • Plastic films are widely used in flexible packaging because they have water vapor barrier properties necessary for the good preservation of perishable products or products with a limited shelf life.
  • Papers are materials made from fibers, generally cellulosic, and therefore of plant origin. They are naturally porous and permeable to gases and cannot, as such, be used for this application.
  • Packaging made from barrier paper produced online is described in the request.
  • WO2011 / 056130 By online manufacturing is meant manufacturing on a single production tool comprising all the elements useful for making paper
  • the proposed barrier level is limited to non-restrictive measurement conditions (temperate, i.e. 25 ° C, 75% relative humidity).
  • the barrier level is measured by a permeability to water vapor, a low barrier signifying a high permeability to water vapor. It is known in the literature that "tropical" conditions (i.e. 38 ° C, 90% relative humidity) are much more severe than temperate conditions, and therefore the barrier measured in temperate conditions is much lower.
  • carrier paper it is necessary to understand a non-porous paper, comprising a fibrous substrate covered with one or more layers, sufficiently impermeable to water vapor to prevent its penetration into the packaging. , in a quantity likely to affect the conservation of the product or the integrity of the product inside.
  • the invention is particularly interested in water vapor barrier papers having a water vapor permeability of at most 150 g / m 2 / 24h and, preferably, less than 100g / m 2 / 24h, measured according to standard ASTM F1249 under so-called tropical conditions of 38 ° C and 90% relative humidity.
  • barrier paper is also heat-sealable, in order to allow the formation of the package by welding the paper on itself.
  • the manufacture of heat-sealable papers uses, for example, the deposition of a covering layer of a heat-sealable polymer on a cellulosic substrate.
  • a covering layer has a fairly strong adhesive power when not dry, and must be able to be dried completely before the paper is wound on itself, on pain of sticking of the different turns of the coil between them.
  • this covering layer is generally carried out offline during one or more stages of transformation, which makes it possible to have a good quality of coating, to benefit from a paper at room temperature at the time of coating this which allows the covering layer not to penetrate too much into the fibrous support, and to be able to adapt the time of passage of the width in the ovens, at a speed for example of the order of 200 m / min, so that the duration of exposure to these heating means is sufficient to thoroughly dry the heat-sealing covering layer.
  • the papers offering a water vapor barrier and possibly heat-sealing are generally manufactured in the state of the art during processing operations and have, as a standard, covering layers of 10 to 30 g / m 2 sec which are deposited in one or more thicknesses using different coating means (air knife, reverse etching, Meyer slide or bar or any other coating method) or by applying a thick layer to the using a curtain bed.
  • different coating means air knife, reverse etching, Meyer slide or bar or any other coating method
  • the invention relates to the development of a paper having, during its online production, water vapor barrier and heat seal properties.
  • This paper barrier and heat sealer can be used to make packaging by welding the paper onto itself.
  • the invention aims, according to a first of its aspects, to meet this need and it does so by means of a process for manufacturing a water vapor barrier and heat-sealable paper in which one applies in line to the paper and on a fibrous substrate at least one covering layer comprising at least one film-forming thermoplastic polymer, according to claim 1.
  • the invention provides good barrier levels vapor even water with a weight cover layer not exceeding 10g / m 2 by dry weight, in particular strictly less than 10 g / m 2.
  • This aspect of the invention is based on the observation that despite the relatively high speed of advancement of the paper imposed by an industrial paper-making machine, of the order for example of 400 m / min, the in-line coating of a a composition intended to form a heat-sealing covering layer is possible, provided that sufficient drying capacity is used to dry the layer before the winding operation.
  • a relatively low covering layer weight can facilitate in-line drying, while providing sufficient barrier properties.
  • the invention therefore makes it possible, thanks to an on-line process, to increase productivity by eliminating the handling operations associated with off-line processing and by reducing the rates of waste.
  • the covering layer does not penetrate too deeply into the fibrous substrate, in order to reduce the amount applied to the paper when this layer is polymer-based. In addition, less penetration of the covering layer makes it easier to create a barrier film.
  • a second possibility is the use of a calender before any paper treatment.
  • Another possibility is to provide for the presence of a precoat to reduce the porosity of the paper.
  • this precoat may not be present, and the layer of covering can be applied to the fibrous substrate directly or after application of a sealer layer.
  • Another possibility is to combine one or the other of the previous ones.
  • Certain hydrophobic and highly film-forming latexes can be used in the formulation of the precoat.
  • the hydrophobic nature of the precoat can then pose a problem of wettability during the application of the covering layer, when the latter is aqueous, leading to a non-perfectly homogeneous covering of the fibrous substrate precoated by the covering layer, especially in the case of an online process with a high speed of the sheet.
  • the surface energy of the precoat must be sufficiently different from that of the covering layer while respecting the well-known rules of wettability in order to reduce the risk of wetting defects.
  • lamellar fillers contribute to increasing the barrier effect thanks to the tortuosity they bring, as the document teaches for example Imerys Technical Guide, Pigments for Paper, May 2008 .
  • This charge by interfering between the lamellar particles, hinders even more the movement of the water molecules in particular around the lamellar particles.
  • the document WO 2009/117040 A1 discloses lamellar charges of clay.
  • the invention makes it possible to have a reinforced barrier effect with the precoat, which allows a reduction in the quantity of covering layer to be applied or, for an equal quantity of covering layer, makes it possible to further increase the barrier level of the paper, which can be useful for papers that need to be vapor-tight.
  • the paper of the invention is preferably produced on a paper machine from a fibrous substrate made up of cellulose fibers and optionally synthetic fibers.
  • Cellulose fibers are generally a mixture of short fibers and long fibers.
  • Additives such as sizing agents, wet strength agents, retention agents, or defoamers can be added.
  • the paper may also contain paper fillers such as titanium dioxide, kaolin, calcium carbonate, talc, among others.
  • the paper is preferably a wrapping paper.
  • the invention also relates to a paper obtained by the process according to the invention.
  • Another subject of the invention is a packaging process in which an object is packaged by heat-sealing the paper obtained by the process according to the invention, in particular at a production rate greater than or equal to 40 bags per minute, on VFFS (Vertical Form, Fill and Seal) type vertical packaging machines, along 330 mm longitudinal sealing lines per bag.
  • VFFS Very Form, Fill and Seal
  • the pre-layer when present, may be identical to the covering layer or be a pigmentary layer as defined below.
  • the precoat is preferably made up of a mixture of at least one latex and of fillers also sometimes called "pigments".
  • the latex according to the invention preferably has a Tg (glass transition temperature) measured according to ASTM E1356 standard less than 25 ° C and more preferably less than 10 ° C.
  • the latex can be chosen from latexes of the following chemical types: styrene-butadiene, styrene-acrylic, acrylics, butyl-acrylate, butyl-acrylate-styrene-acrylonitrile, .... and more particularly among the emulsions of styrene-butadiene.
  • the latex content is preferably at least 15 parts dry compared to fillers dry (100 parts), preferably at least, or even more than 25 and better 30 parts per 100 parts load.
  • the fillers contain lamellar fillers and are preferably constituted by a mixture of lamellar filler (s) and finer fillers, in particular non-lamellar.
  • the lamellar filler (s) are particles in the form of lamellae having a form factor (ratio between greater length and thickness) greater than or equal to 15, more preferably at least 40 and even more preferably at least 60 .
  • the precoat comprises at least one lamellar filler of form factor of at least 15 and preferably a mixture of lamellar filler (s) of form factor of at least 15 and more filler (s) fine (s), in particular non-lamellar (s), whose particle size at 80% by weight is less than or equal to 2 ⁇ m, measured by the Sedigraph ISO13317-3 method.
  • the particle size at 80% by weight of lamellar filler (s) may for example be greater than 2 ⁇ m. According to another example, less than 80% by weight of lamellar particles can be less than or equal to 2 ⁇ m.
  • the finer charges may, according to a first example, have a smaller particle size than that of the lamellar charges with equivalent weight distribution. According to a second example, they can have a greater weight distribution for the same particle size as that of the lamellar fillers.
  • the finer fillers can be chosen from all the other pigments used in stationery, which meet the required size conditions.
  • the percentage of lamellar charges relative to the total charges can vary from 10 to 90%, preferably from 40 to 90% and even more preferably from 60 to 90%.
  • the lamellar fillers can be chosen, for example, from kaolin and talc, and their mixtures.
  • lamellar particles can be of size less than or equal to 2 ⁇ m (measured according to the Sedigraph ISO13317-3 method).
  • the particles of the lamellar charge (s) are in particular oriented substantially parallel to the surface of the substrate.
  • the particles of the finer charge (s) can be chosen from calcium carbonate, barium sulphate, silica, titanium dioxide or their mixtures ... They are characterized by a particle size at 80% by weight lower at 2 microns, measured using the ISO13317-3 Sedigraph method
  • the finer fillers can also be chosen from any other pigment, including kaolin, of sufficient fineness, in particular by a particle size at 95% by weight of less than 2 microns, measured according to the Sedigraph ISO13317-3 method.
  • the binder is preferably chosen from the abovementioned latexes, but other binders or co-binders such as PVOH, starch, CMC, etc. can be used.
  • the binder may comprise a polymer of a chemical nature which is not present in the covering layer.
  • the polymers used to obtain the vapor barrier and the heat sealability are preferably chosen from polymers or copolymers based on PVdC (polyvinylidene chloride) or acrylic.
  • polymers are applied pure or mixed with fillers.
  • pure is meant without particular charge. It is optionally possible to add other products to the dispersion of polymers such as pH management agents, rheological agents (viscosant for example), anti-foaming agents, wetting agents, etc.
  • fillers within the covering layer can in particular help to reduce the risk of the coil turns sticking together.
  • the paper sheet After drying the fibrous substrate, the paper sheet can pass over a friction cylinder ("yankee cylinder" in English) to improve the surface condition of the sheet and thus the distribution of the first layer.
  • the sheet can then be treated in size-press or any other equipment of the same type.
  • a pigment composition can be previously used in order to make "mouth-pore".
  • This sealant composition can contain up to 20 parts dry relative to dry fillers of binder such as latex, of styrene-butadiene chemical nature for example, and up to 20 parts dry relative to dry pigments.
  • binder such as latex, of styrene-butadiene chemical nature for example
  • co-binders such as starch for example.
  • This composition preferably contains fillers which are generally less than 2 microns in size. These fillers can be chosen, among others, from kaolins or calcium carbonates or their mixtures.
  • the precoat is applied to the support thus treated using any of the coating techniques that can be encountered on paper machines. This can be in particular a coating with a blade, rotogravure, reverse engraving or a coating with a Meyer bar.
  • the precoat is deposited with a dry layer weight preferably between 4 and 12 g / m 2 .
  • This precoat is then dried without contact by one or more infrared ovens and / or one or more hot air ovens.
  • a level of 150 seconds Bekk is sufficient (measured according to ISO 5627).
  • the water vapor barrier and heat sealant topcoat is applied by coating using any of the coating techniques that may be encountered on paper machines. This can be for example a coating with a blade, rotogravure, reverse engraving or a coating with a Meyer bar.
  • 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 at the level of the winding coil, using one or more infrared ovens and / or one or more hot air ovens. .
  • a coating on the opposite side can be carried out to reinforce the barrier and / or to provide other functionalities such as printability, correction of the curl, etc.
  • the paper thus produced can optionally be calendered in line to reduce the surface roughness before being rolled up.
  • the final grammage of the paper can be between 45 and 200g / m 2 .
  • the water vapor barrier measured according to ASTM F1249 at 38 ° C and 90% relative humidity is less than 150g / m 2 / 24h, and preferably 100g / m 2 / 24h.
  • a 55 g / m 2 fibrous support is produced on a paper machine operating at 400 m / min.
  • the paper machine is equipped with a friction roller placed before the size-press.
  • the fibrous support is first rubbed and then treated online on both sides by size-press with a sealant pigment composition, containing 100 dry parts of kaolin of Amazon Premium type (Cadam), and a mixture of starch Merifilm 104 (Tate & Lyle) and DL950 type latex (Dow) up to 20 parts dry compared to dry kaolin.
  • the treatment applied is 5g / m 2 sec in total.
  • the dry weight of the applied pre-coat is 7g / m 2 and its formulation is given in the table below: material Reference / Nature suppliers parts % by mass GX-N Topsperse dispersed Coatex 0.2 0.2 Capim NP Kaolin (lamellar charge) IMERYS 60.0 45.5 Amazon Premium Kaolin (finer charge) CADAM 40.0 30.4 Bacote 20 crosslinking QUARRECHIM 1.5 1.1 DL950 / Styrene-butadiene latex Tg 7 ° C Styrene-butadiene latex Tg 7 ° C DOW 30.0 22.8
  • the particle size at 97% by weight of Amazon Premium measured according to the Sedigraph ISO13317-3 method, is less than 2 microns.
  • the particle form factor of Capim NP is 28.
  • the water vapor barrier is measured by a Mocon brand device, of the Permatran 3/61 type according to ASTM F1249 at 38 ° C and 90% relative humidity to determine the barrier contribution of this precoat. It is measured at 334 +/- 13g / m 2 / 24h. After coating the covering layer, a barrier of less than 150 g / m 2 / 24h is obtained.
  • a 55 g / m 2 fibrous support is produced on a paper machine operating at 400 m / min.
  • the paper machine is equipped with a friction roller placed before the size-press.
  • the fibrous support is first rubbed and then treated online on both sides by size-press with a sealer pigment composition containing 100 dry parts of kaolin of Amazon Premium type (Cadam) and a mixture of starch Merifilm 104 (Tate & Lyle ) and DL950 (Dow) type latex up to 20 parts dry compared to dry kaolin.
  • the treatment applied is 5g / m 2 sec in total.
  • the dry weight of the applied pre-coat is 7g / m 2 and its formulation is given in the table below: material Reference / Nature suppliers parts % by mass GX-N Topsperse dispersed Coatex 0.2 0.2 Capim NP Kaolin (lamellar charge) IMERYS 60.0 45.5 Hydrocarb 95 Calcium carbonate (finer charge) OMYA 40.0 30.4 Bacote 20 crosslinking QUARRECHIM 1.5 1.1 DL950 / Styrene-butadiene latex Tg 7 ° C Styrene-butadiene latex Tg 7 ° C DOW 30.0 22.8
  • the particle size at 95% by weight of Hydrocarb 95 measured according to the Sedigraph ISO13317-3 method, is less than 2 microns.
  • the water vapor barrier is measured by a Mocon brand device, of the Permatran 3/61 type according to ASTM F1249 at 38 ° C and 90% relative humidity to determine the barrier contribution of this precoat. It is measured at 315 +/- 9g / m 2 / 24h. After coating the covering layer, a barrier less than 150 g / m 2 / 24h is obtained.
  • a paper is produced on-line under the same conditions as in Example 1. However, after the pre-layer has been deposited, it is coated on-line with a covering layer consisting of a dispersion of PVdC copolymer (Diofan A297 from Solvay), and dried without contact on an infrared oven and then a hot air oven. It is then wound into a coil without further treatment and no bonding between turns is observed.
  • the dry weight of the covering layer is 6.5g / m 2 .
  • the water vapor barrier is measured by a Mocon brand device, of the Permatran 3/61 type according to ASTM F1249 at 38 ° C and 90% relative humidity. It is measured at 21.0 +/- 2.4g / m 2 / 24h.
  • Sealing is then simulated on a laboratory heat sealer by gluing the side covered with the covering layer on itself at 110 ° C, under 3 bars and for 0.5 seconds. Then the force necessary to detach the papers stuck on 15mm wide samples is then measured at an angle of 90 degrees according to the Tappi T540 standard at a speed of 100mm / min.
  • a sealing force of 3.5N / 15mm is obtained.

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

Claims (14)

  1. Verfahren zur Herstellung eines Barrierepapiers gegen Wasserdampf, das, gemäß der Norm ASTM F1249 unter tropisch genannten Bedingungen von 38 °C und 90 % relativer Luftfeuchtigkeit gemessen, eine Wasserdampfpermeabilität von maximal 150 g/m2/24 Std. aufweist und heißsiegelbar ist, wobei auf der Linie, auf der Papiermaschine und auf einem faseriges Substrat mindestens eine Abdeckungsschicht aufgetragen wird, die mindestens ein thermoplastisches folienbildendes Polymer umfasst, und wobei auf der Linie eine Vorschicht vor dem Auftragen der Abdeckungsschicht auf der Vorschicht aufgetragen wird, wobei die Vorschicht mindestens einen lamellenförmigen Füllstoff mit einem Formfaktor von mindestens 15 umfasst, wobei die Vorschichtmenge kleiner oder gleich 12 g/m2 in der Trockenmasse und/oder die Abdeckungsschichtmenge kleiner oder gleich 10 g/m2 in der Trockenmasse ist.
  2. Verfahren nach Anspruch 1, wobei die Produktionsgeschwindigkeit des Papiers größer oder gleich 300 m/Min., besser größer oder gleich 400 m/Min., noch besser größer oder gleich 500 m/Min. ist.
  3. Verfahren nach einem der vorstehenden Ansprüche, wobei eine porenfüllende Verbindung auf der Linie auf das faserige Substrat vor dem Auftragen irgendeiner Schicht oder Vorschicht auf der Linie aufgetragen wird, wobei die porenfüllende Verbindung bevorzugt durch Leimpresse oder durch Filmpresse aufgetragen wird.
  4. Verfahren nach einem der vorstehenden Ansprüche, wobei das abschließende Flächengewicht zwischen 45 und 200 g/m2 liegt.
  5. Verfahren nach einem der vorstehenden Ansprüche, das mindestens einen Trocknungsschritt auf der Linie und dann einen Aufrollschritt auf der Linie umfasst, wobei die Heizleistung bei dem Trocknungsschritt ausreicht, damit die Abdeckungsschicht bei dem Wickelschritt ausreichend trocken ist, damit die Windungen der Spule nicht aneinander kleben, wobei das Papier bevorzugt im Laufe des Trocknens des faserigen Substrats, vor irgendeiner Oberflächenbehandlung, insbesondere Streichen, in Kontakt mit einem Yankee-Zylinder zugeführt wird, wobei das Papier bevorzugt im Laufe des Trocknens der Abdeckungsschicht in einer Zone, in der das Trocknen berührungsfrei stattfindet, insbesondere mit Hilfe mindestens einer Infrarotrampe und/oder einer Heißluftheizung zugeführt wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei die Vorschicht ein Gemisch aus lamellenförmigem (lamellenförmigen) Füllstoff(en) mit einem Formfaktor von mindestens 15 und feinerem (feineren) Füllstoff(en), die insbesondere nicht lamellenförmig sind, umfasst, deren Teilchengröße bei 80 Gew.-% gemäß dem Sedigraph-ISO-13317-3-Verfahren kleiner oder gleich 2 µm ist, wobei der (die) lamellenförmige(n) Füllstoff(e) und der (die) feinere(n) Füllstoff(e) bevorzugt dieselbe Art aufweisen, wobei der Formfaktor der lamellenförmigen Teilchen bevorzugt mindestens 40, bevorzugter mindestens 60 beträgt, wobei der (die) feinere(n) Füllstoff(e) bevorzugt eine Teilchengröße bei 95 Gew.-% kleiner als 2 Mikrometer aufweisen, wobei der (die) lamellenförmige(n) Füllstoff(e) bevorzugt mineralisch sind.
  7. Verfahren nach Anspruch 6, wobei die lamellenförmige(n) Füllstoff(e) aus den Kaolinen und dem Talk und ihren Gemischen ausgewählt werden, und/oder der oder die feinere(n) Füllstoff(e) aus den Kaolinen, dem Calciumcarbonat, dem Bariumsulfat, dem Silizium, dem Titandioxid und ihren Gemischen ausgewählt werden, wobei der (die) feinere(n) Füllstoff(e) bevorzugt aus den Kaolinen ausgewählt werden.
  8. Verfahren nach einem der Ansprüche 6 und 7, wobei die Trockenmasse von lamellenförmigem(n) Füllstoff(en) zwischen 3 und 58 % des Gesamttrockengewichts der Vorschicht liegt, wobei die Gewichtsmenge an lamellenförmigem Füllstoff bevorzugt größer ist als die der feineren Füllstoffe, wobei die Trockenmasse aus feinerem (feineren) Füllstoff (Füllstoffen) bevorzugt zwischen 3 und 58 % des Gesamttrockengewichts der Vorschicht liegt, wobei der Prozentsatz an lamellenförmigen Füllstoffen, in Trockengewicht ausgedrückt, im Vergleich zu der Summe der Füllstoffe, in Trockengewicht ausgedrückt, bevorzugt zwischen 10 und 90 %, bevorzugt zwischen 40 und 90 % und noch besser zwischen 60 und 90 % liegt.
  9. Verfahren nach einem der Ansprüche 1 bis 8, wobei die Vorschicht ein Bindemittel umfasst, insbesondere ein Bindemittel, das ein Polymer chemischer Art umfasst, das in der Abdeckungsschicht nicht gegenwärtig ist, wobei das Bindemittel bevorzugt eine Glasübergangstemperatur Tg, gemäß der Norm ASTM E1356 gemessen, kleiner oder gleich 25 °C und bevorzugter 10 °C aufweist, wobei das Bindemittel bevorzugt aus den Latizes chemischer Art Styrol-Butadien, Styrol-Acryl, Acryl, Butyl-Acrylat, Butyl-Acrylat-Styrol-Acrylnitril und bevorzugt den Latizes chemischer Art Styrol-Butadien ausgewählt wird, wobei das Bindemittel bevorzugt in Form von Latex eingeführt wird, wobei die Bindemittelmenge bevorzugt mindestens 15 Trockenmasseanteile im Vergleich zu Trockenfüllstoffen (100 Anteile), bevorzugt mehr als 25, besser 30 Anteile beträgt.
  10. Verfahren nach einem der Ansprüche 1 bis 9, wobei die Abdeckungsschicht ohne Kalandern des Substrats, das von der Vorschicht abgedeckt ist, aufgetragen wird, und/oder die Abdeckungsschicht die einzige Schicht ist, die die Vorschicht abdeckt, wobei die Abdeckungsschicht bevorzugt ein oder mehrere Polymere aufweist, die aus den Copolymeren auf der Basis von PVdC oder Styrol-Acryl ausgewählt werden.
  11. Verfahren nach einem der vorstehenden Ansprüche, bei welchen auf der Linie auf der Papiermaschine eine Schicht auf der Fläche des faseriges Substrats, die der entgegengesetzt ist, die die Abdeckungsschicht trägt, aufgetragen wird, insbesondere eine Bedruckbarkeitsschicht, wobei das Substrat Vorschichten auf seinen entgegengesetzten Flächen, die identisch oder unterschiedlich sind, tragen kann.
  12. Verfahren nach einem der vorstehenden Ansprüche, wobei das Papier heißversiegelbar ist, insbesondere auf sich selbst, mit einem Herstellungstakt, der größer oder gleich 40 Beutel pro Minute ist, auf vertikalen Verpackungsmaschinen vom Typ VFFS (Vertical Form, Fill and Seal - vertikales Formen, vertikales Füllen und Versiegeln), entlang von Längsversiegelungslinien von 330 mm pro Beutel.
  13. Verfahren nach einem der vorstehenden Ansprüche, wobei das Papier ab 90° C heißversiegelbar ist, wenn das Versiegeln auf heißen Zangen, bei 3 bar und während 0,5 s ausgeführt wird, wobei das Papier bevorzugt auf sich selbst mit einer Versiegelungskraft, die unter einem Winkel von 90 Grad gemäß der Norm Tappi T540 bei einer Geschwindigkeit von 100 mm/Min. gemessen größer oder gleich 2 N/15 mm heißversiegelbar ist, wenn das Versiegeln auf heißen Zangen, bei 3 bar und während 0,5 s ausgeführt wird.
  14. Verpackungsverfahren, bei dem ein Objekt verpackt wird, indem auf ihm selbst das Papier, das durch das Herstellungsverfahren nach einem der vorstehenden Ansprüche erhalten wird, heißversiegelt wird, insbesondere mit einem Herstellungstakt größer oder gleich 40 Beutel pro Minute, auf vertikalen Verpackungsmaschinen vom Typ VFFS (Vertical Form, Fill and Seal), entlang von Längsversiegelungslinien von 330 mm pro Beutel.
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PT3186441T (pt) 2020-03-03
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CN106795696A (zh) 2017-05-31
US10494768B2 (en) 2019-12-03
DK3186441T3 (da) 2020-03-16
FR3024468B1 (fr) 2019-05-17
WO2016016339A1 (fr) 2016-02-04
BR112017001953A2 (pt) 2018-02-27
JP2017524080A (ja) 2017-08-24
JP6681891B2 (ja) 2020-04-15
CA2956663A1 (fr) 2016-02-04
US20170211236A1 (en) 2017-07-27
SI3186441T1 (sl) 2020-07-31
EP3186441A1 (de) 2017-07-05

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