WO2022027081A1 - Procédé de fabrication de produits d'emballage à base de fibres de cellulose et produit d'emballage à base de fibres de cellulose - Google Patents

Procédé de fabrication de produits d'emballage à base de fibres de cellulose et produit d'emballage à base de fibres de cellulose Download PDF

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Publication number
WO2022027081A1
WO2022027081A1 PCT/AT2021/060273 AT2021060273W WO2022027081A1 WO 2022027081 A1 WO2022027081 A1 WO 2022027081A1 AT 2021060273 W AT2021060273 W AT 2021060273W WO 2022027081 A1 WO2022027081 A1 WO 2022027081A1
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Prior art keywords
weight
pulp
chemical
cellulose
semi
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PCT/AT2021/060273
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German (de)
English (en)
Inventor
Elisabeth SCHWAIGER
Harald Meysel
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Mondi Ag
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Publication of WO2022027081A1 publication Critical patent/WO2022027081A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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
    • 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
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate pulp
    • 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
    • D21H11/10—Mixtures of chemical and mechanical pulp
    • 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

Definitions

  • the invention relates to a method for producing cellulose fiber-based packaging products and a cellulose fiber-based packaging product.
  • Reprocessed, i.e. recycled, cellulose is often used to manufacture paper-based packaging solutions.
  • waste paper pulp is not sufficient, since, for example, requirements for mechanical stability cannot be met.
  • the object of the invention was to overcome the disadvantages of the prior art and to provide a method for producing cellulose-based packaging products by means of which paper packaging products with sufficiently good mechanical properties can be provided efficiently and resource-efficiently in terms of process technology. Furthermore, it was an object of the invention to provide a cellulose-based packaging product with sufficiently good mechanical properties that can be produced with little effort and cost-effectively.
  • the process for manufacturing cellulose fiber-based packaging products includes the steps:
  • the first material used is a cellulose mixture consisting of, based on 100% by weight of dry matter of the first material, 30% by weight to 70% by weight of chemical semi-chemical pulp and, based on 100% by weight of dry matter of the first material, 30% by weight to 70% by weight of chemical sulphate pulp, the chemical half-pulp previously containing cellulose fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 0.6 mm to 1.2 mm as half-pulp and, based on 100% by weight of dry matter of the semi-pulp having a lignin content according to JAYME/KNOLLE/RAPP of 8% by weight to 18% by weight.
  • the first material can also be referred to as the first starting material.
  • dry matter or 100 wt.
  • bone dry weight is often used as a synonym for an absolute dry mass.
  • dry mass is therefore to be understood as meaning material without any water content. This applies both to itself, for example, to the first material or the pulp mixture and, for example, to the semi-pulp and the sulphate pulp.
  • the procedure for the gravimetric determination of the lignin content according to JAYME/KNOLLE/RAPP can JAYME G complicat KNOLLE H. & G. RAPP, "Development and final version of the lignin determination method according to JAYME-KNOLLE", Das Textil 12, 464 - 467 (1958), No. 17/18.
  • the procedure described herein comprises an extraction using an extraction mixture of methanol and benzene, it being possible to use dichloromethane as the extraction agent instead, as is known per se today and is customary.
  • the chemical semi-pulp can preferably have a lignin content according to JAYME/KNOLLE/RAPP of 9 to 17% by weight, based on 100% by weight dry matter of the chemical semi-pulp.
  • the chemical semi-pulp can contain at least 50 wt. %, preferably at least 70 wt. % dry matter of the chemical semi-pulp about 15 to 30% by weight, preferably 20 to 25% by weight, hemicelluloses.
  • the chemical half-pulp can have 51-75% by weight, in particular 58-70% by weight, cellulose fibers with the specified length-weighted, average fiber-length range according to ISO 16065-2:2014.
  • the chemical semi-pulp may comprise cellulosic fibers having a length-weighted mean fiber length according to ISO 16065-2:2014 of 0.8 mm to 1.1 mm.
  • the chemical sulfate pulp can, for example, contain pulp fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 1.4 mm to 2.8 mm and, based on 100% by weight dry matter of the chemical sulfate pulp, a lignin content according to JAYME/KNOLLE/RAPP from 0% by weight to 8% by weight.
  • a sulphate pulp can have lower hemicellulose and extractive contents. Examples of suitable sulphate pulps include long-fiber sulphate pulp comprising one or more types of coniferous wood, short-fibre sulphate pulp comprising one or more types of hardwood and mixtures comprising the stated sulphate pulps.
  • the specified measures enable an ecologically, economically and technically efficient production of cellulose fiber-based packaging products to be carried out.
  • kraft liners i.e. paper layers based purely on sulphate pulp
  • a higher raw material yield and thus improved process, raw material and cost efficiency can be achieved.
  • paper plies produced as specified above from the cellulose mixture with the specified parameters, have very good mechanical properties which are at least similar to the mechanical properties of pure sulfate cellulose liners or are even approximately equivalent.
  • papers or paper plies or webs produced from the specified pulp mixture even surpass, at least in some aspects, the mechanical properties of known kraft or sulfate pulp lines.
  • paper plies made from the specified cellulose mixture have, for example, astonishingly good compressive strength, which is of great importance in the packaging industry.
  • These very good mechanical properties are also found in cellulose-based packaging products comprising the at least one dried, first fleece web or paper web, produced from the cellulose mixture.
  • the specified method is efficient from a technical, economic and ecological point of view.
  • the production of the packaging product can be carried out in large quantities by means of a few process steps which are customary per se in the paper industry or by means of systems and machines which are customary in the paper industry.
  • the specified measures can be used to manufacture packaging products under improved wood or raw material yield are carried out.
  • the chemical semi-pulp can be made from, for example, crushed hardwood.
  • the packaging products can be provided or produced, for example, in the form of paper, cardboard or cardboard.
  • other nonwoven webs can also be processed together with the at least one first nonwoven web to form a packaging product.
  • Such other fleece webs can also include the cellulose mixture.
  • nonwoven webs comprising other cellulose-based pulps or wood pulps or other woven, nonwoven or sheet-like materials made of non-cellulose-based materials can be processed with the at least one first nonwoven web to form a packaging product, with the pulp mixture Favorable properties produced with the specified parameters can also be found in such combined packaging products.
  • a packaging product can be produced, as is customary per se, as a cardboard box with a corrugated middle layer and two smooth outer layers, at least one of these layers comprising the pulp mixture.
  • the cellulose mixture is used as the sole cellulose fiber source for the production of the packaging product, or that only the at least one first fleece web is processed into the packaging product.
  • the pulp mixture can be produced in suitable mixing containers, for example by mixing suspensions of the chemical half-pulp and the sulphate pulp.
  • a mixture of the chemical half-pulp and the sulphate pulp would also be possible in the dry or semi-dry and nevertheless transportable state after, for example, a preceding defibration or division of, for example, bales or webs.
  • a component of the pulp mixture could be admixed as a dry or semi-dry and nevertheless transportable pulp after, for example, a preceding defibration or division of, for example, bales or webs of a pulp suspension.
  • the at least one, first aqueous suspension and/or the at least one, first fleece web can, of course, in addition to the cellulose mixture, also contain other substances, in the paper industry usual additives or additives, such as fillers, starch, etc. are added, such additives are preferably used only in small amounts.
  • nonwoven webs are processed to form a packaging product, the same can in principle be processed or connected to one another using methods known per se in papermaking. For example, joining the fleece webs together in an already pre-dried state using a binding agent is conceivable. Alternatively, if necessary, several fleece webs can also be wet-pressed together before a drying step, which is often also referred to as couching in technical jargon. Before the fleece webs are joined or connected, they can also be individually preformed, for example corrugated or smoothed as required. As is known per se, the fleece web(s) can be dried in stages, as is customary in paper machines. In general, paper finishing steps that are customary in practice can also be used for individual fleece webs.
  • the cellulose fiber-based packaging product obtained can of course also be made up according to the requirements, which is usually made up into rolls or endless packaging products, which are then further used for use can be cut up and formed into packaging.
  • the first material used is a cellulose mixture consisting of, based on 100% by weight of dry matter of the first material, 50% by weight to 70% by weight of the chemical half-cellulose, and based on 100% by weight % dry matter of the first material, 30% to 50% by weight of the chemical sulphate pulp is produced.
  • the first material is a cellulose mixture consisting of 30% by weight to 50% by weight of the chemical semi-cellulose, based on 100% by weight of dry matter of the first material , and based on 100% by weight dry matter of the first material, 50% by weight to 70% by weight of chemical sulphate pulp is produced.
  • the chemical semi-pulp can, based on 100% by weight dry matter of the semi-pulp, with an extract content according to ISO 14453:2014 from 0.2% by weight to 1.5% by weight, preferably from 0.3% by weight to 1 .0% by weight can be produced. This has a particularly advantageous effect on the process management itself.
  • the chemical semi-pulp can be produced by a process comprising chemically treating crushed hardwood in a pulping solution having from 9 g/L to 50 g/L of active alkali expressed as NaOH, with a temperature of the pulping solution during the chemical treatment 150°C to 180°C and a chemical treatment duration of 25 minutes to 45 minutes.
  • the chemical semi-pulp may be produced by a process comprising chemically treating crushed hardwood in a pulping solution having 15 g/L to 34 g/L active alkali expressed as NaOH.
  • the term active alkali primarily includes the sum of the hydroxyl and hydrosulfite species of the digestion solution, as described, for example, in SCAN-N 2:88, 1988, and can be determined, for example, according to the titration procedure described in SCAN-N 30 will.
  • the concentration is given by converting the values obtained using the molecular weight of NaOH ( ⁇ 40 g/mol).
  • a weight ratio of pulping solution/hardwood, usually also referred to as the hydromodulus can be, for example, 3 to 8 m 3 /bdt wood, preferably about 4.5 to 7 m 3 /bdt wood, in the chemical treatment of the hardwood.
  • the abbreviation or unit bdt refers to the term "bone dry ton” commonly used in paper technology and thus refers to one ton of absolutely dry wood in the sense of the atro weight.
  • the term or the unit "bon dry metric ton", abbreviated bdmt, is also common and to be understood synonymously.
  • the comminuted hardwood can be chemically treated in a pulping solution comprising an amount of active alkali of about 7.5% to 15%, preferably 10% to 15%, based on the total weight of dry wood.
  • a sulfidity of the digestion solution can be, for example, 60-65% based on active alkali.
  • the chemical semi-pulp is produced by a process comprising chemical treatment of comminuted hardwood in a pulping solution containing from 3 g/L to 21 g/L NaOH, preferably 6 g/L up to 14 g/L NaOH.
  • the chemical semi-pulp can be produced by a process comprising chemically treating crushed hardwood in a pulping solution comprising from 6 g/L to 29 g/L Na2S, preferably from 9 g/L to 20 g/L Na2S expressed as NaOH.
  • the chemical semi-pulp is produced by a process comprising chemical treatment of comminuted hardwood in a pulping solution containing from 10 g/L to 50 g/L Na2CO3, preferably from 17 g/L to 34 g/L Na2CO3 , expressed as NaOH.
  • the usual recovery or reprocessing of the pulping solution which occurs as so-called black liquor after pulping or after cooking the comminuted wood, can be made more efficient.
  • a complex, complete processing of the digestion liquor back to so-called white liquor including the use of chemicals otherwise required for this, can be dispensed with.
  • a pulping solution containing a concentration of Na2CO3 as specified is still completely sufficient to produce the chemical semi-pulp.
  • the digestion solution can, of course, have the above-mentioned components together, ie NaOH, Na2S and Na2COs, with the active alkali being formed primarily by NaOH and Na2S.
  • a chemical semi-chemical pulp made from such a hardwood mixture has proven to be particularly well suited for the production of the pulp mixture and subsequently the cellulose fiber-based packaging products.
  • these two hardwoods are also readily available, so that the process for manufacturing packaging products can also be used in an economically efficient manner.
  • Such high-consistency defibration can specifically reduce the shives content in the chemical semi-pulp. This in turn can have a positive effect both on the product properties and on the process itself, for example on the drying behavior of the chemical semi-pulp, as will be demonstrated below using examples.
  • the consistency of the solids suspension is adjusted to 30% to 40% in the high-consistency defibrator before the mechanical processing and defibration.
  • the solid suspension can be defibrated to a splinter content of less than 15% according to T 275 sp-02:2007 with a Schopper-Riegler value according to ISO 5267-1:1999 of more than 28°SR will.
  • the splinter content according to T 275 sp-02:2007 can be determined in particular with a Somerville apparatus with a slit width of 0.15 mm.
  • Such a low-consistency grinding of the chemical half-pulp can positively influence in particular the mechanical properties of the packaging products subsequently produced from the chemical half-pulp, in particular the mechanical properties of the packaging products can be further improved, as is also described in more detail below with reference to examples.
  • the chemical semi-cellulose is produced with a water retention value according to ISO 23714:2014 of 130% to 195%.
  • This method measure is particularly advantageous with regard to the dewatering or drying steps carried out in the method, since the aqueous nonwoven web guided in the method can be dewatered better or with less effort and also more energetically, including the chemical semi-cellulose.
  • the at least one, first fleece web based on 100% by weight of dry matter of the fleece web, is produced with a content of at least 50% by weight of the cellulose mixture.
  • the at least one, first nonwoven web can be produced with a content of at least 80% by weight of the cellulose mixture, based on 100% by weight of dry matter of the nonwoven web.
  • the at least one, first aqueous suspension and/or the at least one, first nonwoven web can in principle also be admixed with other additives or additives customary in the paper industry, such as fillers, starch, etc., with such additives preferably only being used in small amounts .
  • a consistency of the at least one, first aqueous suspension before equalization and pre-drying to form the at least one, first nonwoven web can be adjusted to a value of 0.5% to 1.8%.
  • a cellulose mixture with an ash residue according to ISO 1762:2015 of less than 2% by weight can particularly preferably be produced as the first material.
  • Packaging products made from such a cellulose mixture have, above all, good resistance to aging. Furthermore, in particular the mechanical strength of the packaging products can be further improved in this way.
  • At least 60% by weight of the first material is used to produce a cellulose fiber-based packaging product, based on 100% by weight of the total dry mass of materials used.
  • a packaging product can be delimited at least on one side by a layer comprising the cellulose mixture.
  • a second or further water-containing nonwoven web comprising a cellulose mixture can also be arranged on the outside opposite the at least one first nonwoven web, and a packaging product can thus be provided which is delimited by two paper layers comprising the cellulose mixture.
  • a cellulose fiber-based packaging product for the production of a cellulose fiber-based packaging product, only a plurality of water-containing, first nonwoven webs comprising the cellulose mixture are connected to one another.
  • a cellulose fiber-based packaging product it is also possible for the production of a cellulose fiber-based packaging product to only process, in particular dry, the at least one water-containing, first nonwoven web comprising the cellulose mixture.
  • the object of the invention is also achieved by a cellulose fiber-based packaging product, which packaging product can be produced by the method described above or by means of the method measures specified above.
  • the cellulose fiber-based packaging product consists of at least 30% by weight of a cellulose mixture consisting of, based on 100% by weight dry matter of the cellulose mixture, 30% by weight to 70% by weight chemical semi-cellulose, and based on 100 % by weight dry matter of the pulp mixture 30% by weight to 70% by weight chemical sulphate pulp, the chemical semi-chemical pulp comprising cellulose fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 0.6 mm to 1.2 mm and based on 100% by weight dry matter of the semi-pulp has a lignin content according to JAYME/KNOLLE/RAPP of 8% by weight to 18% by weight.
  • Such a cellulose fiber-based packaging product can easily meet packaging requirements and, in particular, has good mechanical properties.
  • a packaging product of this type can be given a surprisingly good crush resistance, for example, by means of the specified cellulose mixture.
  • a cellulose fiber-based packaging product can be formed, for example, from paper, cardboard or paperboard, and can accordingly consist of one ply or several connected plies or paper plies comprising cellulose fibers.
  • Individual layers can be shaped as is usual in the paper industry or packaging industry, for example designed as smooth layers, or have a corrugated design, as is often used in the case of cardboard.
  • Individual layers or even the entire packaging product can have additives or additives that are customary in the paper industry, such as fillers or starch, with such additives preferably being present only in small amounts.
  • the chemical semi-pulp can preferably have a lignin content according to JAYME/KNOLLE/RAPP of 9-17% by weight, based on 100% by weight dry matter of the chemical semi-pulp.
  • the chemical semi-pulp can contain at least 50 wt. %, preferably at least 70 wt Weight % dry matter of chemical semi-pulp about 15 to 30 wt.%, Preferably 20 to 25 wt.% Have hemicelluloses.
  • the chemical half-pulp can have 51-75% by weight, in particular 58-70% by weight, cellulose fibers with the specified length-weighted, average fiber-length range according to ISO 16065-2:2014.
  • the chemical semi-pulp may have cellulosic fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 0.8 mm to 1.1 mm.
  • the sulphate pulp can contain cellulose fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 1.4 mm to 2.8 mm and, based on 100% by weight of dry matter of the chemical sulphate pulp, a lignin content according to JAYME/KNOLLE/ RAPP from 0% to 8% by weight.
  • the sulphate pulp can only have low hemicellulose and extract contents.
  • suitable sulphate pulps include long-fiber sulphate pulp comprising one or more softwood species, short-fibre sulphate pulp comprising one or more hardwood species and mixtures comprising the sulphate pulps mentioned.
  • the cellulose fiber-based packaging product can consist of at least 30% by weight of a cellulose mixture consisting of, based on 100% by weight of dry matter of the cellulose mixture, 50% by weight to 70% by weight of the chemical semi-cellulose, and based on 100% by weight .% dry matter of the pulp mixture consists of 30% to 50% by weight of the chemical chemical sulphate pulp.
  • a cellulose mixture consists of, based on 100% by weight of dry matter of the cellulose mixture, 30% by weight to 50% by weight % of the chemical semi-pulp, and based on 100% by weight dry matter of the pulp mixture 50% by weight to 70% by weight of the chemical sulphate pulp.
  • the packaging product consists of a plurality of connected paper layers, with at least one paper layer of the packaging product comprising the pulp mixture.
  • At least one outer paper layer of the packaging product comprises the cellulose mixture.
  • At least one inner paper layer of the packaging product can also comprise the specified cellulose mixture.
  • a packaging product can also consist of just one layer of paper comprising the cellulose mixture.
  • the at least one paper layer comprising the pulp mixture consists of at least 60% by weight of the pulp mixture.
  • the cellulose mixture has an ash residue of less than 2% by weight according to ISO 1762:2015.
  • This feature can in particular improve the aging resistance of a cellulose fiber-based packaging product.
  • FIG. 2 shows an exemplary embodiment of a process scheme for the mechanical processing of an aqueous suspension of the chemical semi-pulp
  • FIG. 3 shows an exemplary embodiment of a process diagram for the production of a pulp mixture and an aqueous suspension comprising the pulp mixture in the course of a headbox and a subsequent wire section;
  • FIG. 5 shows an exemplary embodiment of a process scheme for producing a composite nonwoven web
  • FIG. 6 shows an exemplary embodiment of a process diagram of a drying section
  • FIG. 7 shows a detail of an exemplary embodiment of a cellulose fiber-based packaging product in longitudinal section
  • FIG. 8 shows a detail of a further exemplary embodiment of a cellulose fiber-based packaging product in longitudinal section
  • FIG. 9 shows a detail of a further exemplary embodiment of a cellulose fiber-based packaging product in longitudinal section.
  • At least one cellulose fiber-comprehensive first material is produced, with the at least a, first material a pulp mixture consisting of a chemical semi-chemical pulp and a sulphate pulp is produced.
  • a possible course of the production of the chemical semi-pulp 1 is explained in more detail below with reference to FIGS. 1 and 2 .
  • a cellulose known as usual by the so-called sulphate process generally also known as the kraft process or kraft digestion process, can be used as the sulphate cellulose.
  • comminuted hardwood 2 or a mixture of different, comminuted hardwoods 2 can be used as the starting material for the production of the chemical semi-pulp 1 . It can preferably be provided here that a mixture of 60% by weight to 90% by weight comminuted beech wood and 10% by weight to 40% by weight comminuted oak wood is used as comminuted hardwood 2 to produce the semi-pulp 1 . In particular, a mixture of 70% by weight to 85% by weight comminuted beech wood and 15% by weight to 30% by weight comminuted oak wood can be used.
  • the comminuted hardwood 2 or a hardwood mixture 2 is then produced by a process comprising chemical treatment of the comminuted hardwood 2 in a digester 3 or cellulose digester 3 .
  • the chemical half-pulp 1 is produced in such a way that it contains cellulose fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 0.6 mm to 1.2 mm and hemicelluloses and, based on 100% by weight of dry matter of the chemical half-pulp 1 having a JAYME/KNOEEE/RAPP eignin content of from 8% to 18% by weight.
  • the chemical semi-pulp 1 can preferably be produced with a lignin content according to JAYME/KNOLLE/RAPP of 9 to 17% by weight, based on 100% by weight dry matter of the chemical semi-pulp 1 .
  • the chemical semi-pulp 1 can also be produced with an extract content according to ISO 14453:2014 of 0.2% by weight to 1.5% by weight, preferably 0.3% by weight to 1.0% by weight.
  • the chemical semi-pulp 1 can contain at least 50 wt. %, preferably at least 70 wt. % cellulose fibers with the specified length-weighted, average fiber length range according to ISO 16065-2:2014, and based on 100% by weight dry matter of the chemical semi-pulp 1 about 15 to 30% by weight, preferably 20 to 25% by weight, hemicelluloses. Based on 100% by weight of dry matter of the chemical half-pulp, the chemical half-pulp 1 can have 51 to 75% by weight, in particular 58 to 70% by weight, cellulose fibers with the specified length-weighted, average fiber-length range according to ISO 16065-2:2014.
  • the chemical semi-pulp may have cellulosic fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 0.8 mm to 1.1 mm.
  • the comminuted hardwood 2 or the mixture of hardwoods 2 can be chemically treated to produce the chemical semi-pulp 1 by means of or in a pulping solution containing 9 g/L to 50 g/L of active alkali, expressed as NaOH.
  • active alkali primarily includes the sum of the hydroxyl and hydrosulfite species of the digestion solution, as described, for example, in SCAN-N 2:88, 1988, and can be defined, for example, according to that described in SCAN-N 30 titration procedure can be determined.
  • the concentration is given by converting the values obtained using the molecular weight of NaOH ( ⁇ 40 g/mol).
  • the crushed hardwood 2 or the mixture of hardwoods 2 can be chemically treated by means of or in a pulping solution containing 15 g/L to 34 g/L of active alkali, expressed as NaOH.
  • a temperature of the digestion solution during the chemical treatment can be 150° C. to 180° C., preferably 160° C. to 175° C., and a duration of the chemical treatment can be 25 minutes to 45 minutes, preferably 30 minutes to 40 minutes.
  • a weight ratio of pulping solution/hardwood can be, for example, 3 to 8 m 3 /bdt wood, preferably about 4.5 to 7 m 3 /bdt wood, in the chemical treatment of the hardwood 2 .
  • the abbreviation or unit bdt refers to the term "bone dry ton" customary in paper technology, and thus refers to one ton of absolutely dry wood in terms of the atro weight Wood or hardwood 2 comprising an amount of active alkali of about 7.5% to 15%, preferably 10% to 15% are chemically treated.
  • a sulfidity of the digestion solution can be, for example, 60% to 65% based on active alkali.
  • the chemical semi-chemical pulp 1 can be produced by a process comprising chemically treating crushed hardwood 2 in a pulping solution comprising from 3 g/L to 21 g/L NaOH, preferably comprising from 6 g/L to 14 g/L NaOH.
  • the first material 1 comprising at least one cellulose fiber is treated by a process comprising chemical treatment of comminuted hardwood
  • 2 is prepared in a digestion solution containing from 6 g/L to 29 g/L Na2S, preferably from 9 g/L to 20 g/L Na2S, expressed as NaOH.
  • the chemical semi-pulp 1 can also be produced by a process comprising chemically treating crushed hardwood 2 in a pulping solution comprising from 10 g/L to 50 g/L Na2CO3, preferably from 17 g/L to 34 g/L Na2COs expressed as NaOH .
  • This has particularly advantageous effects on the production process itself, since the digestion solution can be recovered in a simplified manner, as described below.
  • the digestion solution can, of course, have the above-mentioned components together, ie NaOH, Na2S and Na2COs, with the active alkali being formed primarily by NaOH and Na2S.
  • the digestion solution from the digester As shown roughly schematically in FIG. 1, the digestion solution from the digester
  • the first material 1 comprising cellulose fibers can be separated from the digestion solution obtained after the chemical treatment, also referred to as black liquor, for example by means of washing presses 5. After the black liquor has been separated, the chemical semi-pulp 1 obtained can still be processed in a process shown in Fig. 1 process step not shown in detail and then further processed.
  • the black liquor obtained by boiling in the digester 3 can, as roughly illustrated in FIG.
  • a treatment section 6 can comprise a concentration or evaporation of the black liquor and then incineration of the evaporated black liquor.
  • a reusable pulping solution can then be produced from the resulting inorganic melt, as is customary in the paper industry, by diluting it with water and/or fresh thin white liquor and fed back to the boiler 3 .
  • white liquor it has been shown that that for the production of the chemical semi-pulp 1 no comprehensive or complete processing of the black liquor to a so-called white liquor is required.
  • the pulping solution used in the digester 3 for the production of the chemical semi-pulp 1 can expediently contain Na2COs in the concentration range already specified above, which means that complete causticization during the processing of the black liquor can be dispensed with.
  • a digestion solution containing Na2COs can also be referred to as green liquor in technical jargon.
  • the chemical semi-pulp 1 can then be further processed.
  • mechanical processing and defibration of an aqueous solid suspension of the chemical semi-chemical pulp 1 is carried out in a high-consistency defibrator 7 or high-consistency refiner 7 .
  • the chemical semi-chemical pulp 1 can first be diluted in a tank 8 with an optional circulating device to form an aqueous suspension of solids.
  • a consistency of the solids suspension before mechanical processing and defibration in the high-consistency defibrator 7 can be set to 30% to 40%, for example.
  • Such defibration in a high-consistency defibrator 7 serves, among other things, to reduce the so-called sliver content of the chemical half-pulp 1, ie to break up pulp agglomerates that are still wood-like. It has proven advantageous if the solid suspension of the chemical semi-pulp 1 defibrates to a shive content of less than 15% according to T 275 sp-02:2007 with a Schopper-Riegler value according to ISO 5267-1:1999 of more than 28°SR will.
  • the splinter content according to T 275 sp-02:2007 can be determined in particular with a Somerville apparatus with a slit width of 0.15 mm.
  • a solid suspension of the chemical semi-pulp 1 can be produced in a tank 10 .
  • a consistency of the solids suspension before the mechanical processing and grinding in the low-consistency refiner 9 can suitably be set to 2% to 6%.
  • mechanical processing of the chemical semi-pulp 1 can also be entirely unnecessary.
  • Mechanical processing or defibration of the chemical semi-pulp 1 primarily has a positive effect on drying behavior in the course of further processing of the chemical semi-pulp 1 and on the air permeability or porosity and, for example, the mechanical properties of the packaging products produced.
  • the first material comprising cellulose fibers is a cellulose mixture consisting of, based on 100% by weight of dry matter of the first material, 30% by weight to 70% by weight of chemical semi-cellulose 1 and related to 100% dry matter by weight of the first material, 30% to 70% by weight chemical sulphate pulp 11.
  • the pulp mixture of chemical semi-pulp 1 and sulphate pulp 11 can be produced, for example, by combining aqueous suspensions of these pulps 1, 11 in the tank 12 shown in FIG. 3 with agitator(s).
  • the pulp mixture made from chemical semi-pulp 1 and sulphate pulp 11 can also be produced in a dry or only slightly moist state.
  • the pulp mixture can also be produced in such a way that a dry or only slightly moist semi-chemical pulp 1 and/or sulphate pulp 11 is added to an aqueous suspension consisting of semi-chemical pulp 1 and/or sulphate pulp 11 in the tank 12. How out As can be seen in Fig. 3, the method involves the production of at least one first aqueous suspension comprising the first material or the pulp mixture, for example in the tank 12 shown.
  • a chemical composition of the at least one, first aqueous suspension can also be set or adjusted beforehand, as is known per se in paper or pulp technology.
  • the at least one first aqueous suspension can be admixed with additives or aggregates and auxiliaries that are customary in paper technology, such as fillers, starch, etc.
  • auxiliaries that are customary in paper technology, such as fillers, starch, etc.
  • a constant part of conventional design can be provided, which was represented only schematically by tank 12 in FIG. 3 . In reality, such a constant part can of course also include other common components.
  • the first material is a cellulose mixture consisting of, based on 100% by weight dry matter of the first material, 50% by weight to 70% by weight of the chemical semi-chemical pulp 1, and based on 100% by weight .% Dry matter of the first material 30 wt.% To 50 wt.% Of the chemical sulfate pulp 11 is produced.
  • the first material is a cellulose mixture consisting of, based on 100% by weight of dry matter of the first material, 30% by weight to 50% by weight of the chemical semi-chemical cellulose 1, and based on 100% by weight. Dry matter of the first material 50 wt.% To 70 wt.% Of the chemical sulfate pulp 11 is produced.
  • the pulp mixture is produced from chemical half-pulp 1 and sulphate pulp 11 with an ash residue according to ISO 1762:2015 of less than 2% by weight. Above all, this measure can improve the aging resistance of the packaging product produced.
  • a consistency of the at least one, first aqueous suspension comprising the chemical semi-chemical pulp 1 and the sulphate pulp 11 or the pulp mixture can be reduced to a value of 0.5% to 1.8%, preferably 0.8%, before further processing. up to 1.5%.
  • This for example, by supplying water into the tank 12.
  • the further processing of this at least one first suspension can then as at be done in a known manner by means of a paper machine, as is described roughly schematically below with reference to FIGS. 3 to 6.
  • the at least one, first aqueous suspension comprising the chemical semi-chemical pulp 1 and the sulfate pulp 11, or the pulp mixture of these pulps 1, 11, as is known, can be fed onto a rotating endless screen 13 of a wire section 14 are applied.
  • the at least one, first aqueous suspension is equalized and pre-dried to form at least one water-containing, first nonwoven web 15 , as is illustrated schematically in FIG. 3 .
  • the wire 13 can here be guided over dewatering means 16 of the wire section 14, which dewatering means 16 can be formed, for example, by suction strips. In principle, dewatering in a wire section 14 can only be effected by gravity.
  • the dewatering or pre-drying of the at least one, first nonwoven web 15 can be supported by generating a vacuum using a vacuum device 17.
  • the at least one first fleece web 15 comprising the cellulose mixture can be pre-dried by means of the wire section 14, for example to a water content of 70% by weight to 85% by weight.
  • the at least one, first aqueous suspension or the at least one, first nonwoven web 15 can in principle also be admixed with other additives or additives customary in the paper industry, such as fillers, starch, etc., with such additives preferably only being used in small amounts will. It can preferably be provided that the at least one, first nonwoven web 15, based on 100% by weight of dry matter of the nonwoven web 15, i.e. atro, with a content of at least 50% by weight, preferably with a content of at least 80% by weight, of the pulp mixture is produced.
  • the at least one, first fleece web 15 can then be dried further by means of a press section 18 as shown in FIG. 4 .
  • the at least one, first fleece web 15 can, as shown, be guided between rollers 19 of the press section 18 and thereby be further dewatered under high pressure.
  • further drying can be additionally supported by means of absorbent support material, as is known per se, for example by the felt mats 20 shown in FIG 40% by weight to 65% by weight, based on the total mass of the fleece web 15 .
  • a press section 18 is shown only in part for the purpose of better clarity, as can also be seen from the tear lines.
  • a press section 18, as is known per se, can comprise more than just two rolls 19; in particular, several pairs of rolls formed by rolls 19 can be arranged one after the other, with individual pairs of rolls being able to be designed quite differently.
  • a so-called shoe press and a so-called nip press are examples of possible designs of press sections.
  • the first material or the cellulose mixture of chemical semi-chemical pulp 1 and sulphate pulp 11 can be produced depending on the requirements of the packaging product to be produced, for example whether packaging paper, cardboard or cardboard can be produced should, in addition, further fleece webs 21, 22 are processed into the packaging product.
  • FIG. 5 Such an example for the production of a cellulose fiber-based packaging product, produced from several fleece webs, will now be explained in more detail with reference to FIG. 5, the method shown schematically in FIG. 5 being chosen purely as an example. Of course, other embodiments of the method than that shown in FIG. 5, in particular different arrangements of a plurality of fleece webs 15, 21, 22, are also possible.
  • one or more further water-containing fleece web(s) 21, 22 can optionally be made from one or more material(s) comprising cellulose fibers via the production of one or more further aqueous suspensions) and their Pre-drying ready or made.
  • Such further fleece webs 21, 22 can basically be produced analogously or in a similar way to that described above with reference to FIGS. 1 to 4. But it is self- Of course, it is also possible for further fleece webs 21, 22 to be produced in a different way using other methods known per se in the paper industry. In principle, such further fleece webs can also comprise the first material comprising cellulose or the cellulose mixture of chemical semi-chemical cellulose 1 and sulphate cellulose 11 or consist largely of it. However, it is of course also possible for further fleece webs 21, 22 to be produced from other materials comprising cellulose fibers, for example by recycling methods from waste paper or from plants containing hard or soft wood or other cellulose fibers by mechanical, thermomechanical and/or chemical processing methods, subsequent equalization and drying to nonwoven webs. For example, such further nonwoven webs 21, 22 may comprise mechanical pulp or chemically processed pulp. Such further fleece webs 21, 22, like the at least one, first fleece web 15, can optionally be admixed with additives customary in the paper industry.
  • one of the other fleece webs 21 can be produced in this fleece web 21 by means of corrugated rollers 23, which can optionally be heated. Subsequently, such a corrugated fleece web 21 can be connected to the at least one, first fleece web 15 and optionally to one or more further fleece web(s) 22 .
  • a connection of the non-woven webs 15, 21, 22 can, for example, in principle take place before further drying by wet pressing, but can also take place, for example, by gluing or gluing the non-woven webs 15, 21, 22 after drying. Production and drying of the fleece webs 15, 21, 22 can therefore also take place, for example, on separate systems or paper machines, with the fleece webs 15, 21, 22 subsequently being glued or bonded.
  • further fleece webs 21, 22 may also include the cellulose mixture of chemical semi-chemical cellulose 1 and sulphate cellulose 11.
  • more or fewer nonwoven webs 21, 22 than shown in the exemplary embodiment according to FIG. 5 are combined to produce the packaging product.
  • only the at least one, first water-containing fleece web 15 is processed into a packaging product.
  • the water-containing first nonwoven web 15 and optionally further, water-containing nonwoven webs 21, 22 are finally processed further to form the cellulose-fiber-based packaging product with further drying of the nonwoven web(s) 15, 21, 22.
  • the Nonwoven web(s) 15, 21, 22 are finally dried by means of a drying section 24 to a desired water content.
  • a drying section 24 For better clarity, only the at least one, first fleece web 15 is shown in FIG.
  • a drying section 24 can comprise numerous rotating drying cylinders 26 over which the at least one, first nonwoven web 15 or optionally the nonwoven web composite 25 can be guided.
  • the drying cylinders can be heated directly.
  • heating ducts not shown in detail in FIG.
  • a temperature of the drying cylinders 26 of a drying section 24 can, for example, increase successively in the direction in which the at least one nonwoven web 15 or optionally a nonwoven web composite 25 is fed through.
  • a drying section 24 can additionally comprise further dewatering aids, such as the wire webs 27 shown in FIG.
  • Such screen webs can, for example, prevent the at least one, first fleece web 15 or the fleece web composite 25 from running off the hot drying cylinders 26 .
  • the at least one, first nonwoven web 15 or optionally the nonwoven web composite 25 can be dried by means of the drying section 24, for example to a water content of 1% by weight to 10% by weight.
  • the cellulose fiber-based packaging product obtained can of course still be made up according to requirements, which is usually made into rolls or endless packaging products.
  • the method can generally provide that related at least 30% by weight of the first material or the cellulose mixture for the production of the cellulose fiber-based packaging product are used for 100% by weight of the total dry matter of materials used. Provision can preferably be made for at least 60% by weight of the first material or the pulp mixture of chemical semi-chemical pulp 1 and sulfate pulp 11 to be used to produce the cellulose fiber-based packaging product, based on 100% by weight of the total dry matter of materials used. It is also quite possible that at least 90% by weight of the first material or the cellulose mixture is used to produce the cellulose fiber-based packaging product, based on 100% by weight of the total dry mass of materials used.
  • cellulose fiber-based packaging products 29 are shown in longitudinal section in sections, these three exemplary embodiments being purely exemplary and, of course, further embodiment variants being possible, as has already been explained above with reference to the description of the method.
  • a cellulose fiber-based packaging product 29 can be produced in particular according to the method steps or measures described above.
  • a cellulose fiber-based packaging product 29 consists of at least 30% by weight of a cellulose mixture which, based on 100% by weight of dry matter of the cellulose mixture, 30% by weight to 70% by weight .% chemical semi-chemical pulp 1, and also based on 100% by weight dry matter of the pulp mixture, 30% by weight to 70% by weight chemical sulphate pulp 11.
  • the chemical pulp 1 has cellulose fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 0.6 mm to 1.2 mm and based on 100 % by weight of dry matter of the semi-pulp 1 has a lignin content according to JAYME/KNOLLE/RAPP of 8% by weight to 18% by weight.
  • the packaging product 29 consists of at least 30% by weight of a cellulose mixture consisting of, based on 100% by weight of dry matter of the cellulose mixture, 50% by weight to 70% by weight of the chemical semi-chemical pulp 1 , and based on 100% by weight dry matter of the pulp mixture, 30% by weight to 50% by weight of the chemical sulphate pulp 11.
  • the packaging product 29 can also consist of at least 30% by weight of a cellulose mixture consisting of, based on 100% by weight of dry matter of the cellulose mixture, 30% by weight to 50% by weight of the chemical semi-chemical pulp 1, and based on 100% by weight .% dry matter of the pulp mixture, 50% to 70% by weight of the chemical sulphate pulp 11.
  • the chemical semi-pulp 1 can have an extract content according to ISO 14453:2014 of 0.2% by weight to 1.5% by weight.
  • the chemical semi-pulp 1 can preferably have a lignin content according to JAYME/KNOLLE/RAPP of 9 to 17% by weight, based on 100% by weight dry matter of the chemical semi-pulp 1 .
  • the chemical semi-pulp 1 may contain at least 50 wt. %, preferably at least 70 wt. %, of cellulose fibers having the specified length-weighted average fiber length range, based on 100 wt 1 about 15 to 30% by weight, preferably 20 to 25% by weight, of hemicelluloses.
  • the chemical half-pulp 1 can have 51 to 75% by weight, in particular 58 to 70% by weight, cellulose fibers with the specified length-weighted, mean fiber-length range according to ISO 16065-2:2014.
  • the chemical semi-pulp 1 may have cellulose fibers with a length-weighted average fiber length according to ISO 16065-2:2014 of 0.8 mm to 1.1 mm.
  • the chemical half-pulp 1 can particularly preferably have an extract content according to ISO 14453:2014 of 0.3% by weight 1.0% by weight, based on 100% by weight of dry matter of the half-pulp 1 .
  • a cellulose fiber-based packaging product 29 consists of at least 60% by weight of the cellulose mixture of chemical half-cellulose 1 and sulfate cellulose 11 .
  • a cellulose-based packaging product 29 shown in FIG. 7 the same consists only of a paper layer 30, which paper layer 30 of the packaging product 29 comprises the cellulose mixture of chemical semi-chemical cellulose 1 and sulphate cellulose 11 or at least predominantly of this pulp mixture.
  • the cellulose fiber-based packaging product 29 consists of two paper layers 30, 31 connected to one another, with at least one paper layer 30 comprising or at least predominantly the pulp mixture of the chemical semi-chemical pulp 1 and the sulfate pulp 11 consists of this pulp mixture.
  • the other paper layer 31 can comprise another material having cellulose fibers, for example wood pulp, cellulose or recycling material or processed waste paper.
  • the layer 31 can also comprise other non-fiber-based materials such as plastics, metals or other materials or mixtures of materials.
  • the packaging product 29 in the form of a box consists of a total of three paper layers 30, 31, 32 connected to one another, with a corrugated paper layer 32 being surrounded by two uncorrugated paper webs or layers 30, 31 in this embodiment .
  • at least one paper ply 30 can comprise the cellulose mixture or consist at least predominantly of the cellulose mixture.
  • the corrugated paper layer 32 can, for example, comprise recycled waste paper or cellulose obtained from waste paper, while the second uncorrugated paper layer 31 can comprise, for example, another cellulose, such as kraft pulp.
  • the two outer, uncorrugated paper layers 30 , 31 can comprise the cellulose mixture or at least predominantly consist of the cellulose mixture of the chemical semi-chemical pulp 1 and the sulphate pulp 11 .
  • At least one inner paper layer 32 of the packaging product is also possible that at least one inner paper layer 32 of the packaging product.
  • this at least one paper ply 30 consists of at least 60% by weight of the cellulose mixture of chemical semi-chemical pulp 1 and sulfate pulp 11 .
  • the cellulose mixture of the packaging product 29 has an ash residue according to ISO 1762:2015 of less than 2% by weight, as a result of which an improvement in the aging resistance of the packaging product 29 can be achieved.
  • the chemical semi-pulp was produced by chemically treating or boiling a mixture of comminuted hardwoods consisting of 80% by weight comminuted beech wood and 20% by weight comminuted oak wood, based on the total mass of comminuted hardwood.
  • This comminuted hardwood mixture was chemically treated at 168° C. for 35 minutes in a pulping solution with a weight ratio of pulping solution/hardwood or hydromodulus of 7m 3 /bdt (bone dry ton) hardwood.
  • the active alkali content of the digestion solution was varied as follows:
  • Semi-pulp sample A approx. 10% active alkali based on total dry mass
  • Semi-pulp sample B about 7.5% active alkali based on the total mass of dry hardwood; Sulfidity 62 to 63% based on active alkali.
  • Semi-pulp sample C about 15% active alkali based on the total mass of dry hardwood; Sulfidity 62 to 63% based on active alkali.
  • a length-weighted average fiber length of the cellulose fibers according to ISO 16065-2:2014 was determined to be 0.75 to 1.09 mm for all chemical semi-pulps used to produce paper samples A to C.
  • Extract content 0.9% by weight to 1.0% by weight
  • Semi-pulp sample B lignin content: 14 wt% to 16 wt%
  • Extract content 1.1% by weight to 1.3% by weight
  • Semi-pulp sample C lignin content: 9 wt% to 11 wt%
  • Extract content 0.6% by weight to 0.7% by weight
  • semi-pulp samples A were processed in different ways using a high-consistency pulper, 36 inch double disc HC refiner with a gap width of 6 to 10 mm and in the second stage with 60 - 120 kWh/adt at a consistency of over 30%, shredded. This was followed by mechanical processing using a low-consistency refiner, Double Disc LC Refiner (Twin-Flow IIIB), with 250 to 450 kWh/adt in two or one stage at a consistency of 4%. The so mechanically treated semi-pulp samples were according to ISO 5267-1: 1999 with regard to Drainage behavior examined.
  • paper samples were produced from the variably treated semi-pulp samples A in accordance with ISO 5269-2:2004 (Rapid-Köthen method).
  • paper samples according to ISO 5269-2:2004 were also prepared from untreated semi-pulp samples A.
  • Half-pulp sample Al prepared from untreated half-pulp samples A.
  • Half-pulp sample A2 prepared from half-pulp samples A treated with a high-consistency pulper
  • Semi-pulp sample A3 prepared from low-consistency refining semi-pulp samples A
  • Semi-pulp sample A4 prepared from semi-pulp samples A treated with a high-consistency defibrator and then with a low-consistency refiner
  • Paper samples A1 to A4 were produced from these semi-pulp samples A1 to A4 in accordance with ISO 5269-2:2004, and their SCT index (compression resistance) was examined in accordance with ISO 9895:2008:
  • Paper samples A2 SCT index 13 - 18 Nm/g Paper samples A3: SCT index 27 - 30 Nm/g Paper samples A4: SCT index 27 - 30 Nm/g
  • pulp mixtures were prepared from semi-pulp samples A4 and, analogously to samples A4, semi-pulp samples C4, mechanically treated by means of high-consistency defibration and low-consistency beating, with a commercially available softwood sulphate pulp made from pine wood with a kappa number of 55.
  • Pulp mixture M1 40% by weight semi-chemical pulp A4, 60% by weight sulfate pulp;
  • Pulp mixture M2 40% by weight semi-chemical pulp C4, 60% by weight sulphate pulp;
  • Pulp mixture M3 70% by weight semi-chemical pulp A4, 30% by weight sulphate pulp
  • Pulp mixture M4 70% by weight semi-chemical pulp C4, 30% by weight sulphate pulp
  • Paper samples M1 to M4 were again produced from these pulp mixtures according to ISO 5269-2:2004 (Rapid-Kothen method) and examined with regard to some mechanical properties. Paper samples V, consisting of 100% by weight sulfate pulp, were produced as comparative samples in accordance with ISO 5269-2:2004.
  • Paper sample M2 approx. 4.8 kPa*m 2 /g
  • Paper sample M3 approx. 4.0 kPa*m 2 /g
  • Paper sample M4 approx. 4.0 kPa*m 2 /g
  • Paper sample V approx. 6.0 kPa*m 2 /g
  • paper samples made from blends of the chemical semi-chemical pulp and the sulphate pulp show good mechanical properties, which can largely meet the requirements for packaging materials.
  • Some mechanical properties show an expected trend compared to paper samples made from 100% by weight sulphate pulp, such as the exemplified bursting index. However, sufficiently good results can still be achieved with the pulp mixtures.

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Abstract

L'invention concerne un procédé de fabrication de produits d'emballage à base de fibres de cellulose ainsi qu'un produit d'emballage à base de fibres de cellulose. Le procédé consiste à produire au moins une première matière comprenant des fibres de cellulose, à produire au moins une première suspension à partir de celle-ci, et à en réaliser le traitement et le séchage pour obtenir au moins une première bande de non-tissé. On fabrique en tant que première matière un mélange cellulosique constitué d'une pâte mi-chimique présentant des fibres de cellulose ayant une longueur de fibre moyenne pondérée en longueur selon ISO 16065-2:2014 de 0,6 mm à 1,2 mm et, par rapport à 100 % en masse sèche de la pâte mi-chimique, présentant une teneur en lignine selon JAYME/KNOLLE/RAPP de 8 % en poids à 18 % en poids, et d'une cellulose de sulfate.
PCT/AT2021/060273 2020-08-06 2021-08-05 Procédé de fabrication de produits d'emballage à base de fibres de cellulose et produit d'emballage à base de fibres de cellulose WO2022027081A1 (fr)

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PL444257A1 (pl) * 2020-09-16 2023-11-20 Mondi Ag Papier do opakowywania palet

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US4652341A (en) * 1980-08-07 1987-03-24 Prior Eric S Accelerated pulping process
US20050061455A1 (en) * 2003-09-23 2005-03-24 Zheng Tan Chemical activation and refining of southern pine kraft fibers
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US20140274680A1 (en) * 2013-03-15 2014-09-18 Gp Cellulose Gmbh Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
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WO2018086672A1 (fr) * 2016-11-11 2018-05-17 Teknologisk Institut Procédé de préparation d'une fraction de fibre riche en cellulose et sous-produits de valeur
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US20050061455A1 (en) * 2003-09-23 2005-03-24 Zheng Tan Chemical activation and refining of southern pine kraft fibers
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PL444257A1 (pl) * 2020-09-16 2023-11-20 Mondi Ag Papier do opakowywania palet

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