EP4367326A1 - Matériau de papier ouaté et produit de papier ouaté comprenant des fibres non ligneuses - Google Patents

Matériau de papier ouaté et produit de papier ouaté comprenant des fibres non ligneuses

Info

Publication number
EP4367326A1
EP4367326A1 EP21949472.1A EP21949472A EP4367326A1 EP 4367326 A1 EP4367326 A1 EP 4367326A1 EP 21949472 A EP21949472 A EP 21949472A EP 4367326 A1 EP4367326 A1 EP 4367326A1
Authority
EP
European Patent Office
Prior art keywords
tissue paper
ply
ply tissue
paper product
wood
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21949472.1A
Other languages
German (de)
English (en)
Inventor
Hans-Jürgen Lamb
Emmanuelle Kientz
Agne BUOB
Mohamed Ali CHARFEDDINE
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.)
Essity Hygiene and Health AB
Original Assignee
Essity Hygiene and Health AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Essity Hygiene and Health AB filed Critical Essity Hygiene and Health AB
Publication of EP4367326A1 publication Critical patent/EP4367326A1/fr
Pending legal-status Critical Current

Links

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
    • D21H27/002—Tissue paper; Absorbent paper
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K10/00—Body-drying implements; Toilet paper; Holders therefor
    • A47K10/16—Paper towels; Toilet paper; Holders therefor
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • 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
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets

Definitions

  • the present disclosure relates to a tissue paper material, a single-ply tissue paper product and a multi-ply tissue paper product comprising non-wood cellulose pulp fibres.
  • Tissue paper materials find extensive use in modern society.
  • Toilet paper, and paper towels such as hand towels or household (kitchen) towels, facial tissues, tissue handkerchiefs, napkins, and industrial wipes are staple items of commerce.
  • These products are typically made from papermaking pulp comprising wood fibres, such as hardwood and softwood fibres.
  • tissue paper product relates to an absorbent paper product based on cellulose wadding which is also called tissue paper material or tissue paper base-sheet in this field of technology.
  • Tissue paper material is defined as a soft absorbent paper material having a low basis weight, of for example 8 to 45 g/m 2 , preferably 10 to 35 g/m 2 per ply.
  • the total basis weight of multi-ply tissue paper products may preferably be up to a maximum of 110 g/m 2 , more preferably to a maximum of 80 g/m 2 .
  • Its density is typically below 0.6 g/cm 3 , preferably below 0.30 g/cm 3 and more preferably in the range of 0.02 g/cm 3 and 0.20 g/cm 3 .
  • the production of tissue paper material is distinguished from conventional paper production, e.g.
  • the fibres contained in the tissue paper are mainly cellulosic fibres, such as pulp fibres from chemical pulp (e.g. Kraft or sulphite), or mechanical pulp (e.g. ground wood, thermo mechanical pulp, chemo-mechanical pulp and/or chemo- thermo-mechanical pulp /CTMP). Pulps derived from both deciduous (hardwood) and coniferous (softwood) can be used. Fibres may also come from non-wood plants e.g. cereal, bamboo, jute, or sisal. The fibres or a portion of the fibres may be recycled fibres, which may belong to any or all of the above categories. The fibres can be treated with additives, e.g.
  • fillers such as, but not limited to, quaternary ammonium compounds and binders, conventional dry- strength agents, temporary wet strength agents or wet-strength agents, in order to facilitate the original paper making or to adjust the properties thereof.
  • Tissue paper products in particular for use as hygiene- or wiping products primarily include all kinds of tissue paper materials including dry-creped tissue paper material, wet- creped tissue paper material, NTT (flat), TAD-paper material (Through Air Drying), tissue paper material based on structured or textured technologies such as ATMOS, NTT (textured), UCTAD, eTAD, QRT, PrimeLineTEX etc. and cellulose or pulp-wadding, or combinations, laminates or mixtures thereof.
  • Typical properties of these hygiene- and wiping products include the ability to absorb tensile stress energy, their drapability, good textile-like flexibility, properties which are frequently referred to as bulk softness, a high surface softness and a high specific volume with a perceptible thickness.
  • a liquid absorbency as high as possible and, depending on the application, a suitable wet and dry strength as well as an appealable visual appearance of the outer product's surfaces are desired.
  • These properties allow these hygiene and wiping products to be used, for example, as cleaning wipes such as windscreen cleaning wipes, industrial wipes, kitchen paper or the like; as sanitary products such as for example bathroom tissue, handkerchiefs, household towels, towels and the like; as cosmetic wipes such as for example facials and as serviettes or napkins, just to mention some of the products that can be used.
  • the hygiene- and wiping products can be dry, moist, wet, printed or pre-treated in any manner.
  • the hygiene- and wiping products may be folded, interleaved or individually placed, stacked or rolled, connected or not, in any suitable manner.
  • the products described above can be used for personal and household use as well as commercial and industrial use. They are adapted to absorb fluids, remove dust, and for other cleaning purposes.
  • tissue paper material is to be made out of pulp
  • the process essentially comprises a forming step that includes a headbox- and a forming wire section, and a drying section, e.g. including through air drying or conventional drying on a Yankee cylinder.
  • the production process can also include a crepe process for tissue paper and, finally, typically a monitoring and winding area.
  • Tissue paper material can be formed by placing the fibres, in an oriented or random manner, on one or between two endless continuously rotating wires or felts of a paper making machine while simultaneously removing water.
  • crepe process which influences the properties of the finished tissue paper product in conventional processes.
  • the conventional dry crepe process involves creping on a usually 3.0 to 6.5 m diameter drying cylinder, the so-called Yankee cylinder, by means of a crepe doctor blade with the aforementioned final dry-solids content of the raw tissue paper. Wet creping can be used as well, if lower demands are made of the tissue quality.
  • the creped, finally dry raw tissue paper material, the so-called base tissue is then available for further processing into the tissue paper product.
  • the use of a modified technique is possible in which an improvement in specific volume is achieved by a special kind of drying which leads to an improvement in the e.g. caliper, bulk, softness, etc. of the tissue paper material.
  • This process which exists in a variety of subtypes, is herein generally termed the structured tissue technique.
  • structured tissue techniques are TAD, ATMOS®, NTT(textured), UCTAD, eTAD, QRT, PrimeLineTex etc.
  • the processing step from the tissue paper material to the finished tissue paper product occurs in processing machines (converting machines) which include operations such as unwinding the tissue paper material (base tissue), calendering of the tissue, laminating, printing or embossing.
  • processing machines converting machines which include operations such as unwinding the tissue paper material (base tissue), calendering of the tissue, laminating, printing or embossing.
  • plies may be combined together by a combining operation of a chemical nature (e.g. by adhesive bonding), or of a mechanical nature (e.g. by knurling or so-called edge embossing), or a combination of both. Examples of such process steps for combining plies together will be described in more detail in the below.
  • processing to finished tissue paper product may involve e.g. longitudinal cut, folding, cross cut etc.
  • individual tissue paper products may be positioned and brought together to form stacks, which may be individually packaged.
  • processing steps may also include application of substances like scents, lotions, softeners or other chemical additives.
  • a film of adhesive is deposited over some or all of the surface of at least one of the plies, then the adhesive- treated surface is placed in contact with the surface of at least one other ply.
  • the plies When several plies are combined together using mechanical bonding, the plies may be combined by knurling, by compression, by edge-embossing, union embossing and/or ultrasonic.
  • Mechanical and adhesive bonding may also be combined to combine several plies together to form a multi-ply product.
  • Embossing is to change the shape of a sheet from flat to shaped, so that there are areas that are raised and/or recessed from the rest of the surface. It therefore constitutes a deformation of the previously relatively flat sheet, and results in a ply having a particular relief.
  • the thickness of the ply or of the multiple plies is in most cases increased after embossing compared with its initial thickness.
  • An embossing process is carried out between an embossing roll and an anvil roll.
  • the embossing roll can have protrusions or depressions on its circumferential surface leading to embossed protrusions/depressions in the paper web.
  • Anvil rolls may be softer than the corresponding embossing roll and may consist of rubber, such as natural rubber, or plastic materials, paper or steel. If the anvil roll is made of a softer material like rubber, a contact area/nip can be formed between the embossing roll (e.g. steel roll) and the anvil roll by the deformation of the softer roll.
  • a pattern can be applied to a tissue paper fulfilling a decorative and/or functional purpose.
  • a functional purpose may be to improve the properties of the hygiene paper product, that is, the embossment may improve the product thickness, absorbency, bulk, softness etc.
  • a functional purpose may also be to provide a joint to another ply in a multi-ply product.
  • Tissue paper products display a number of physical properties which are of importance for their use for example as toilet paper, hand towels, kitchen towels, facial tissues, handkerchiefs, napkins, wipe or the like. Examples of such properties are their strength, softness, and absorbency (primarily for aqueous systems). These physical properties are generally tuned for addressing common consumer demand in view of the intended use of the tissue paper product.
  • tissue paper products have an absorbency so as to be suitable for their purpose such as for wiping liquids or moisture, cleaning etc.
  • tissue paper products need to retain their strength at least for a time period of use e.g. for wiping liquids or moisture.
  • tissue paper products may be intended to come in intimate contact with the body and skin. Accordingly, it is desired that tissue paper products shall exhibit sufficient softness in order to ensure consumer’s comfort.
  • tissue paper product providing a good balance between required properties.
  • tissue paper product achieving a satisfactory absorption, strength and/or softness.
  • An object of the present invention is to fulfill said need for improvement and/or alternatives.
  • non-wood cellulose pulp fibres in tissue paper materials and tissue paper products.
  • the non-wood cellulose pulp fibres may be chemical pulp fibres.
  • the non-wood cellulose pulp fibres may be never-dried fibres. “Never-dried” means herein that the fibres have not been subject to drying before use in the tissue making process. It is believed that the non-wood cellulose pulp fibres being never-dried may contribute to the non-wood cellulose pulp fibres being suitable for use in tissue paper materials and tissue paper products.
  • the non-wood cellulose pulp fibres contain at least 15% hemicellulose. It is believed that such a hemicellulose content may contribute to the non-wood cellulose pulp fibres being suitable for use in tissue paper materials and tissue paper products.
  • the non-wood cellulose pulp fibres contain no more than 15 % lignin.
  • the non-wood cellulose pulp fibres may contain no more than 12 % lignin.
  • the non-wood cellulose pulp fibres may contain no more than 10% lignin. It is believed that such a lignin content may contribute to the non-wood cellulose pulp fibres being suitable for use in tissue paper materials and tissue paper products.
  • the non-wood cellulose pulp fibres may contain at least 15% hemicellulose and no more than 15 % lignin, such as no more than 12 % lignin or no more than 10% lignin.
  • the non-wood cellulose pulp fibres are pre-treated, to obtain the desired amounts of lignin and/or hemicellulose.
  • non-wood cellulose pulp fibres may have a relatively low average fibre length.
  • the non-wood cellulose pulp fibres have an average fibre length of less than 1700 pm.
  • the non-wood cellulose pulp fibres have an average fibre length of less than 1200 pm.
  • the non-wood cellulose pulp fibres have an average fibre length of less than 1000 pm.
  • the non-wood cellulose pulp fibres have an average fibre length of less than 900 p .
  • the non-wood cellulose pulp fibres having a relatively high breaking length may contribute to the non-wood cellulose pulp fibres being suitable for use in tissue paper materials and tissue paper products.
  • the breaking length is the initial breaking length of the non-wood cellulose pulp fibres as measured on the non-wood cellulose pulp fibres after the pulping process.
  • the non-wood cellulose fibres have a breaking length of more than 3000 m.
  • the non-wood cellulose fibres may have a breaking length of more than 3000 m and an average fibre length of less than 1700 pm, such as less than 1200 pm or less than 900 pm.
  • non-wood cellulose pulp fibres having a relatively high ratio between breaking length and average fibre length may contribute to the non-wood cellulose pulp fibres being suitable for use in tissue paper materials and tissue paper products.
  • the non-wood cellulose fibres have a breaking length/average fibre length of more than 3.7.
  • the non-wood cellulose fibres have a breaking length/average fibre length ratio of more than 4.0.
  • the non-wood cellulose fibres have a breaking length/average fibre length ratio of more than 4.5.
  • the non-wood cellulose fibres may have a breaking length/average fibre length ratio of more than 5 such as more than 5.5.
  • the non-wood cellulose fibres may have a breaking length/average fibre length ratio of more than 3.7 such as more than 4 and an average fibre length of less than 1700 pm, such as less than 1200 pm, less than 1000 pm, or less than 900 pm.
  • different types of conventional hardwood and softwood pulps display lower breaking length/average fibre length ratios than those suggested in the above for the non-wood cellulose fibres. This applies also to examples of never-dried hardwood and softwood pulps. Average ratios as calculated for different types of hardwood and softwood pulps are indicated in the table in the below.
  • non-wood cellulose pulp fibres have been found to display lower breaking length/average fibre length ratio than what is proposed in the above.
  • tested samples of dried bagasse fibre pulp was found to have an average ratio of 2.6, dried bamboo fibre pulp an average ratio of 1.2 and dried wheat fibre pulp an average ratio of 3.5.
  • the non-wood cellulose fibres may be never-dried non-wood cellulose pulp fibres and the non-wood cellulose fibres may have a breaking length/average fibre length ratio of more than 3.7, such as more than 4.0 or more than 4.5.
  • the non-wood cellulose pulp fibres as proposed herein may be used together with hardwood cellulose pulp fibres and/or softwood cellulose pulp fibres.
  • non-wood cellulose pulp fibres are never-dried non-wood cellulose pulp fibres.
  • non-wood cellulose fibres are used with softwood cellulose pulp fibres.
  • a portion of or all softwood cellulose fibres may be never-dried softwood cellulose pulp fibres.
  • the softwood cellulose pulp fibres may comprise never-dried hardwood cellulose pulp fibres and/or dried softwood cellulose pulp fibres.
  • non-wood cellulose fibres are used with hardwood cellulose pulp fibres.
  • a portion of or all hardwood cellulose fibres may be never-dried hardwood cellulose pulp fibres.
  • the hardwood cellulose pulp fibres may comprise never-dried hardwood cellulose pulp fibres and/or dried hardwood cellulose pulp fibres.
  • non-wood cellulose pulp fibres as proposed herein may be achieved by treatment by a non-pressurised process.
  • non-wood cellulose pulp fibres as proposed herein may be achieved by treatment by a process with no use of sulfur.
  • non-wood cellulose pulp fibres may be achieved by treatment using methods similar to the methods described EP 2 048281 A1, EP 2247781 B1,
  • the non-wood cellulose pulp fibres may be achieved by treatment using methods similar to the methods described in WO2020264311 A1, WO2020264322 A1 , US20190091643 A1, US2592983.
  • the non-wood cellulose pulp fibres may be achieved by the Phoenix Process TM, of Sustainable Fiber Technologies Inc.
  • non-wood cellulose pulp fibres are derived from agricultural waste or byproduct.
  • the non-wood cellulose pulp fibres are derived from a member of the Pocacea family.
  • the non-wood cellulose pulp fibres may be derived from wheat straw, rice straw, barley straw, oat straw, rye grass, costal Bermuda grass, Arundo donax, miscanthus, bamboo, and/or sorghum.
  • Another example of a member of the Pocacea family is sugar cane, from which non-wood cellulose pulp fibres may be derived, for example from sugar cane bagasse.
  • the non-wood cellulose pulp fibres are derived from a member of the Cannabaceae family.
  • the non-wood cellulose pulp fibres may be derived from hemp and/or hop.
  • the non-wood cellulose pulp fibres are derived from agricultural waste or byproducts.
  • the non-wood cellulose pulp fibres may be derived from agricultural waste or byproducts of the members of the Pocacea family and/or Cannabaceae family such as exemplified in the above, i.e. including agricultural waste or byproducts from wheat straw, rice straw, barley straw, oat straw, rye grass, sugar cane bagasse, hemp or hop.
  • non-wood cellulose pulp fibres may be derived from agricultural waste or byproducts such as banana harvest residue (belongs to the family Musaceae), pineapple residue (belongs to the family Bromeliaceae), bagasse from agave, nut shell waste, hop residue and/or corn stover.
  • non-wood cellulose pulp fibres are derived from kenaf (belongs to the family Malvaceae), switchgrass, succulents, alfalfa (belongs to the family Fabaceae), flax straw (belongs to the family Linaceae), palm fruits (Elaeis or Arecaceae), and/or avocado (Lauraceae).
  • the non-wood cellulose pulp fibres are derived from one or more of wheat straw, rice straw, barley straw, oat straw, rye grass, costal Bermuda grass, Arundo donax, miscanthus, bamboo, sorghum, banana harvest residue, pineapple residue, nut shell waste, sugar-cane bagasse, industrial hemp, and/or members of the Cannabaceae family, kenaf, switchgrass, succulents, alfalfa, corn stover, and flax straw.
  • the non-wood cellulose pulp fibres are derived from wheat straw, oat straw, barley straw, and/or rye grass.
  • the non-wood cellulose pulp fibres may be derived from agricultural waste or byproducts of wheat straw, oat straw, barley straw, and/or rye grass.
  • non-wood cellulose pulp fibres may be derived from wheat straw, such as from agricultural waste or byproducts of wheat.
  • the non-wood cellulose pulp fibres are derived from residues from sugar production.
  • the non-wood cellulose pulp fibres may be residues from beet.
  • non-wood cellulose pulp fibres are derived from sugarcane bagasse.
  • the non-wood cellulose pulp fibres are derived from agave.
  • the non-wood cellulose pulp fibres may be derived from resides from agave syrup production or derived from agave bagasse.
  • tissue paper made of non-wood fibres it is understood that the non-wood cellulose pulp fibres as described herein may also find use in other applications e.g. in wound care, in absorbent articles, for example diapers, sanitary napkins, and incontinence articles, in beauty care, and/or in nonwoven materials and products.
  • non-wood cellulose pulp fibres as described in the above are proposed to be used to form a non-wood tissue ply, comprising non-wood cellulose pulp fibres in an amount of at least 10% by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount of at least 15% by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount of at least 20% by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount of at least 30% by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount of at least 40% by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount from 20 to 50% by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount from 25 to 35% by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount of less than 70 % by dry weight of the non-wood tissue ply.
  • said non-wood tissue ply comprises non-wood cellulose pulp fibres in an amount of less than 60 % by dry weight of the non-wood tissue ply.
  • the non-wood tissue ply further comprises wood pulp fibres, such as hardwood cellulose pulp fibres and/or softwood cellulose pulp fibres.
  • the non-wood tissue ply further comprises wood pulp fibres in an amount such that the wood pulp fibre amount plus the non-wood fibre amount constitutes 100% dry weight of the tissue paper ply.
  • the hardwood/softwood dry weight proportion of the wood pulp fibres in the non-wood tissue ply is less than 95/5.
  • the hardwood/softwood dry weight proportion of the wood pulp fibres in the non-wood tissue ply is less than 90/10.
  • the hardwood/softwood dry weight proportion of the wood pulp fibres in the non-wood tissue ply is less than 80/20.
  • the hardwood/softwood dry weight proportion of the wood pulp fibres in the non-wood tissue ply may be greater than or equal to 0/100.
  • the hardwood/softwood dry weight proportion of the wood pulp fibres in the non-wood tissue ply may be in the range of 70/30 to 30/70.
  • the hardwood/softwood dry weight proportion of the wood pulp fibres in the non-wood tissue ply may be in the range of 60/40 to 40/60.
  • said non-wood cellulose pulp fibres are present throughout the non-wood tissue ply.
  • at least some non-wood cellulose pulp fibres may be found in all parts of the ply, e.g. in all layers of the ply.
  • the non-wood cellulose pulp fibres need not be uniformly distributed, but may be a result of e.g. stratified distribution of the non-wood cellulose pulp fibres.
  • the non-wood cellulose pulp fibres may be homogenously distributed in the ply.
  • the non-wood cellulose pulp fibres may be heterogeneously distributed in the ply.
  • non-wood tissue ply comprises two or more layers
  • at least one layer of the non-wood tissue ply comprises non-wood fibres.
  • said at least one layer maybe an outer layer of the non-wood tissue ply.
  • each out of said two or more layers may comprise non-wood fibres.
  • the non-wood tissue ply is produced by conventional wet press technology (CWP).
  • CWP wet press technology
  • the tissue paper material has been manufactured using conventional wet press technology, i.e. the tissue paper material is a CWP tissue paper material.
  • the tissue paper material may be a dry crepe tissue paper material.
  • the non-wood tissue ply is produced by structured tissue technology.
  • is produced means that the tissue paper material has been manufactured using structured tissue technology, i.e. the tissue paper material is a structured tissue paper material.
  • the non-wood tissue ply is produced by TAD (Through Air Drying) technology.
  • the non-wood tissue ply is produced by ATMOS technology.
  • the non-wood tissue ply is produced by UCTAD technology.
  • the non-wood tissue ply is produced by NTT technology (textured).
  • the non-wood tissue ply is produced by eTAD technology, such as Advantage eTAD technology from Valmet.
  • the non-wood tissue ply is produced by QRT technology.
  • the non-wood tissue ply is produced by PrimeLine TEX technology.
  • tissue paper materials and tissue paper products including the non-wood tissue ply as described in the above with the non wood cellulose pulp fibres as described in the above.
  • a single-ply tissue paper material according to claim 1.
  • a single-ply tissue paper material having a basis weight less than 40 gsm and an absorbency of at least 3 g/g, comprising a non-wood tissue ply, said non-wood tissue ply comprising non-wood cellulose pulp fibres being present in an amount of at least 10% by dry weight of the of the non-wood tissue ply.
  • the tissue paper material has an absorbency of at least 4 g/g.
  • the tissue paper material has an absorbency of at least 5 g/g.
  • the tissue paper material is produced by CWP (Conventional Wet Pressed) technology.
  • the tissue paper material is produced by structured tissue technology.
  • the tissue paper material is produced by structured tissue technology and have an absorbency of at least 6 g/g.
  • the tissue paper material is produced by structured tissue technology and have an absorbency of at least 7 g/g.
  • the tissue paper material is produced by structured tissue technology and have an absorbency of at least 8 g/g.
  • the structured tissue technology is TAD technology.
  • the tissue paper material has a GMT tensile strength of at least 60 N/m.
  • the tissue paper material has a GMT tensile strength of at least 70 N/m.
  • the tissue paper material has a GMT tensile strength of at least 80 N/m.
  • the tissue paper material may have a GMT tensile strength of at least 100 N/m.
  • the tissue paper material may have a GMT tensile strength of at least 150 N/m.
  • the tissue paper material has a basis weight of less than 30 gsm.
  • the tissue paper material has a basis weight of less than 25 gsm.
  • the tissue paper material has a basis weight of more than 10 gsm.
  • the tissue paper material has a basis weight of more than 15 gsm.
  • the tissue paper material may be produced by CWP technology, and have a basis weight from 15 to 20 gsm and an absorption of at least 5 g/g.
  • the tissue paper material may be produced by CWP technology, and have a basis weight from 20 to 30 gsm and an absorption of at least 4 g/g.
  • the tissue paper material may be produced by CWP technology, and have a basis weight above from 30 gsm and an absorption of at least 3 g/g.
  • the tissue paper material may be produced by CWP technology, and the basis weight (gsm) x the absorption (g/g) may be at least 75 (g/m2).
  • the tissue paper material may be produced by CWP technology, and the basis weight (gsm) x the absorption (g/g) may be at least 80 (g/m2).
  • the tissue paper material may be produced by CWP technology, and the basis weight (gsm) x the absorption (g/g) may be at least 90 (g/m2).
  • the tissue paper material may be produced by structured tissue technology, and have a basis weight from 15 to 20 gsm and an absorption of at least 8 g/g.
  • the tissue paper material may be produced by structured tissue technology, and have a basis weight from 20 to 30 gsm and an absorption of at least 7 g/g.
  • the tissue paper material may be produced by structured tissue technology, and have a basis weight above from 30 gsm and an absorption of at least 6 g/g.
  • the tissue paper material may be produced by structured tissue technology, and the basis weight (gsm) x the absorption (g/g) may be at least 120 (g/m2).
  • the tissue paper material may be produced by structured tissue technology, and the basis weight (gsm) x the absorption (g/g) may be at least 140 (g/m2).
  • the tissue paper material may be produced by (g/m2) technology, and the basis weight (gsm) x the absorption (g/g) may be at least 180 (g/m2).
  • the tissue paper material may have a thickness of above 0.08 mm.
  • the tissue paper material may have a thickness below 0.5 mm.
  • a single-ply tissue paper product according to claim 15 comprising a single-ply tissue paper material according to the first aspect in the above.
  • a multi-ply tissue paper product comprising two or more plies, wherein an average basis weight of the plies is less than 40 gsm, and the multi-ply tissue paper product having an absorption of at least 4 g/g, wherein at least one ply is a non wood tissue ply, said non-wood tissue ply comprising non-wood cellulose pulp fibres being present in an amount of at least 10% by dry weight of the of the non-wood tissue Ply-
  • the multi-ply tissue paper product has an absorbency of at least 5 g/g.
  • the multi-ply tissue paper product has an absorbency of at least 6 g/g.
  • At least one ply of the multi-ply tissue paper product is produced by CWP (Conventional Wet Pressed) technology.
  • at least one ply of the multi-ply tissue paper product is produced by structured tissue technology.
  • the structured tissue technology may be TAD technology.
  • At least one ply of the multi-ply tissue paper product is produced by structured tissue technology, and the multi-ply tissue paper product has an absorbency of at least 7 g/g.
  • the ply may be produced by TAD technology.
  • At least one ply of the multi-ply tissue paper product is produced by structured tissue technology, and the multi-ply tissue paper product has an absorbency of at least 8 g/g.
  • the ply may be produced by TAD technology.
  • At least one ply of the multi-ply tissue paper product is produced by structured tissue technology, and the multi-ply tissue paper product has an absorbency of at least 9 g/g.
  • the ply may be produced by TAD technology.
  • all plies of the multi-ply tissue paper product are produced by structured tissue technology.
  • all of the plies may be produced by TAD technology.
  • the multi-ply tissue paper product has a GMT tensile strength of at least 100 N/m.
  • the multi-ply tissue paper product has a GMT tensile strength of at least 120 N/m.
  • the multi-ply tissue paper product has a GMT tensile strength of at least 150 N/m.
  • the multi-ply tissue paper product has a GMT tensile strength of at least 200 N/m.
  • the multi-ply tissue paper product has a GMT tensile strength of at least 300 N/m.
  • the multi-ply tissue paper product has a GMT tensile strength of at least 400 N/m.
  • a majority of the plies of the multi-ply tissue paper material are non-wood tissue plies.
  • all of the plies of the multi-ply tissue paper material are non-wood tissue plies.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount of at least 10% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount of at least 15% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount of at least 20% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount of at least 30% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount of at least 40% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount of no more than 70% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount of no more than 60% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount in a range between from 15 % to 50% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount in a range between from 15 % to 40% by dry weight the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises non-wood cellulose pulp fibres in an amount in a range between from 25 % to 35% by dry weight of the multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises two to five plies.
  • each of the plies of the multi-ply tissue paper product comprises the same amount of non-wood cellulose pulp fibres.
  • at least two plies in said multi-ply tissue paper product comprise different amounts of non-wood cellulose pulp fibres.
  • the amounts differ by at least 5% dry weight.
  • the amounts differ by at least 10% dry weight.
  • the amounts differ by at least 20% dry weight.
  • the multi-ply tissue paper product comprises one or more plies with no non wood cellulose pulp fibres.
  • said at least one non-wood tissue ply is an outer ply of said multi-ply tissue paper product.
  • the multi-ply tissue paper product comprises at least two non-wood tissue plies, wherein the non-wood tissue plies form a first and a second outer ply of the multi-ply tissue paper product.
  • the non-wood ply may be such as defined in the above in any one of the options relating to the first aspect.
  • the at least one non-wood tissue ply of the multi-ply tissue paper product comprises a single-ply tissue paper material in accordance with the first aspect as described in the above.
  • the single-ply tissue paper product and the multi-ply tissue paper product as disclosed herein may for example be a tissue paper product for personal hygiene.
  • the single-ply tissue paper product and the multi-ply tissue paper product disclosed herein may for example be toilet paper, hand wipes, paper napkins, facial tissue, handkerchiefs, or a kitchen towel or an industrial wipe.
  • the single-ply tissue paper product and the multi-ply tissue paper product may be embossed and/or calendared as is known in the art.
  • the plies of the multi-ply product may be joined by ply bonding, such as for example embossing or knurling.
  • the multi-ply product may be joined by nesting.
  • the plies of the multi-ply product may be joined by Goffra-lncolla technology.
  • Fig. 1 is a diagram of absorbency values obtained for tissue paper materials obtained in Example 1;
  • Fig. 2a is a diagram of absorbency values obtained for tissue paper materials obtained in Example 2;
  • Fig. 2b is a diagram of absorbency values obtained for tissue paper products obtained in Example 2
  • Fig. 3 is a diagram of absorbency values obtained for tissue paper products obtained in Example 3
  • Fig. 4 is a diagram of absorbency values obtained for tissue paper products obtained in Example 4;
  • Fig. 5 is a diagram of absorbency values obtained for the tissue paper products obtained in Example 5, including variants of the tissue paper products obtained in Example 2.
  • One-ply tissue paper materials intended for use as kitchen towels were produced using TAD technology with different dry content of non-wood fibre.
  • tissue paper materials Two versions of the tissue paper materials were made, one comprising 0% dry weight non-wood fibres, and one comprising 30% by dry weight non-wood fibres.
  • the non-wood fibre pulp was derived from wheat straw, being treated according to the Phoenix TM process by Sustainable Fiber Solutions Inc.
  • the non-wood fibre pulp was never-dried pulp.
  • the non-wood fibre pulp of this type generally has a lignin content of less than 15 % and a hemicellulose content of more than 15 %.
  • breaking length, average fibre length, and ratio breaking length/average fibre length of the non-wood cellulose fibre pulp are indicated in the table below:
  • the conventional short fibre content was made out of dried hardwood cellulose fibre pulp.
  • the dried hardwood cellulose fibre pulp was dried Eucalyptus fibre pulp, BEK (Bleached Eucalyptus Kraft).
  • the conventional long fibre content was made out of dried softwood cellulose fibre pulp.
  • the dried softwood cellulose fibre pulp was NBSK (Northern Bleached Softwood Kraft).
  • the breaking length/average fibre length ratio of BEK in general has been found to be about 2.4, and the breaking length/average fibre length ratio of NBSK has been found to be about 1.2, as indicated in the table in the Summary section in the above.
  • the machine was a stratified machine with 3 layers headbox, fed with 2 fibre lines:
  • the tissue paper material containing non-wood fibres tends to be stronger than the reference paper material without non-wood.
  • the trial with non-wood is significantly more absorbent than the reference tissue paper material without non-wood.
  • tissue paper material including 30% non-wood fibres was even more absorbent than the tissue paper material including 0% non-wood fibre.
  • Two-ply tissue paper products intended for use as kitchen towels were produced using TAD technology.
  • the two-ply tissue paper products were produced from tissue paper materials (base sheets) produced using TAD technology and with different dry content of non-wood fibre.
  • the non-wood fibre pulp was derived from wheat straw, being treated according to the Phoenix TM process by Sustainable Fiber Solutions Inc.
  • the non-wood fibre pulp was never-dried pulp.
  • the non-wood fibre pulp of this type generally has a lignin content of less than 15 % and a hemicellulose content of more than 15 %.
  • breaking length, average fibre length, and ratio breaking length/average fibre length of the non-wood cellulose fibre pulp are indicated in the table below:
  • the softwood cellulose fibre pulp and the hardwood cellulose pulp were similar to those used in Example 1 in the above.
  • Tissue paper material 1 was made using 0% dry content of non-wood fibres.
  • Tissue paper material 2 was made using 20% dry content of non-wood fibres.
  • Tissue paper material 3 (TP3) was made using 30% dry content of non-wood fibres.
  • the proportions between the conventional short fibre i.e. the Eucalyptus fibre pulp BEK (Bleached Eucalyptus Kraft), the conventional long fibre content, i.e. the Softwood fibre pulp NBSK (Northern bleached softwood kraft), and the non-wood fibres are indicated in the table in the below.
  • the machine was a stratified machine. Long fibre line was feeding Hood and Yankee layers of the headbox; the short fibre line feeding the middle layer. For TPI, Long fibre line was 100% NBSK, and Short fibre line was eucalyptus BEK .
  • non-wood fibre substituted or all of the eucalyptus (BEK).
  • BEK eucalyptus
  • the non wood fibre was not refined.
  • Chemistry was added to provide dry and wet tensile strength, and was kept constant for the 3 qualities TP1, TP2 and TP3.
  • Chemical flows were equally split between both fibre lines.
  • Fig. 2a is a diagram illustrating the absorption of the tissue paper material comprising 0 % non-wood cellulose pulp fibres as compared to the absorption of the tissue paper material comprising 30% non-wood cellulose pulp fibre.
  • the tissue paper material comprising 30% non-wood fibre displayed better absorption than the tissue paper material comprising 0% non-wood fibre.
  • the tissue paper material comprising 20% non-wood cellulose pulp fibre displayed similar absorption as the tissue paper material comprising 0% non-wood cellulose pulp fibre.
  • the tensile strength of the tissue materials comprising non-wood cellulose pulp fibre is slightly less than the tensile strength of the tissue material with no non-wood cellulose pulp fibre. However, the deviation in tensile strength is not very significant and the tensile strength is still within acceptable limits.
  • Two-ply products were formed using the reference tissue paper material TP1 comprising 0% non-wood fibre and the tissue paper material TP3 comprising 30% non-wood fibre as described in the above.
  • 2-ply product 1 (2P-1): 2 plies of the TP1, meaning that the 2-ply product comprises 0% non-wood fibres.
  • 2-ply product 2 (2P-2): 2 plies of TP3, meaning that the 2-ply product comprises 30% dry weight non-wood fibres.
  • the 2-ply tissue paper products were produced by assembling the tissue paper materials (base sheets) using nested 2-ply technology.
  • Fig. 2b illustrates the absorption of the two-ply tissue paper products.
  • the two-ply tissue paper product comprising 30% by dry weight non-wood fibres (2P-2) displayed a higher absorption at a comparable basis weight and thickness than the two-ply tissue paper product comprising no non-wood fibres.
  • the dry tensile strength results of the two-ply tissue paper product comprising 30% by dry weight of non-wood fibres (2P-2) were satisfactory to the intended use of the two-ply tissue paper product as a kitchen towel. Further, the softness of the two-ply tissue paper product comprising 30% by dry weight non-wood fibres (2P-2) displayed a similar softness to the two-ply tissue paper product comprising no non-wood fibres.
  • the results indicate that the two-ply tissue paper products comprising non-wood fibres will display at least a similar absorption as the multi-ply tissue paper product comprising no non-wood fibre. Also, dry tensile strength and softness of the two-ply tissue products are satisfactory. Accordingly, the benefits obtained by using non-wood fibres may be obtained while still achieving a satisfactory tissue paper product.
  • Example 3 Three-ply tissue paper products intended for use as kitchen towels were produced using CWP technology.
  • the three-ply tissue paper products were produced from tissue paper materials (base sheets) produced using CWP technology and with different dry content of non-wood fibre.
  • the pilot machine used was a Crescent former with suction presser roll configuration, with a 2 layers Headbox: 50% Top Layer, 50% Bottom Layer.
  • the machine was run in homogenous mode (same recipe on both layers of the base paper), but 2 fibre lines were used and treated differently.
  • the amount of non-wood fibre introduced ranged from 0 to 50% of the total blend for producing the tissue paper materials (base sheets).
  • the non-wood fibre pulp was derived from wheat straw, being treated according to the Phoenix TM process by Sustainable Fiber Solutions Inc.
  • the non-wood fibre pulp was never-dried pulp.
  • the non-wood fibre pulp had a lignin content of 12.8 and a hemicellulose content of 18.0.
  • the conventional short fibre content was made out of Hardwood.
  • the Hardwood fibre pulp was never-dried pulp.
  • the conventional long fibre content was made out of Softwood.
  • the Softwood fibre pulp was also never-dried pulp.
  • the breaking length and morphology of the hardwood and softwood fibre pulp were as indicated in the table below:
  • composition of the different tissue paper materials (base sheets) and the refining level used is indicted in the below
  • tissue paper materials with non-wood cellulose pulp fibre had similar or higher tensile strength than the tissue paper material without non-wood cellulose pulp fibre.
  • tissue paper materials with non-wood cellulose pulp fibre did not differ significantly from the tissue paper materials without non-wood cellulose pulp fibre.
  • Multi-ply products were formed out of the tissue paper materials (basesheets with )the different non-wood fibre contents.
  • the multi-ply products where three-ply products formed by nesting.
  • Multi-ply product 1 G3A+ G3A+ G3A - i.e. 3 plies with 0% non-wood fibre, and fibre content by dry weight of the entire multi-ply product 1 is 0%.
  • Multi-ply product 2 G3B+G3B+ G3B - l.e. 3 plies with 20% non-wood fibre, and fibre content by dry weight of the entire multi-ply product 2 is 20%.
  • Multi-ply product 3 G3B+G3C+G3b - i.e. 2 plies with 20% non-wood fibre and 1 ply with 50% non-wood fibre, giving a fibre content by dry weight of the entire multi-ply product 3 being 30%.
  • Fig. 3 is a diagram over the absorption values of the three different multi-ply products MP1, MP2, and MP3.
  • the absorption of the multi-ply tissue paper products comprising 20% or 30% by dry weight of the non-wood fibres were even better than the absorption of the multi-ply tissue paper product comprising no non wood further.
  • the multi-ply tissue paper products comprising non-wood fibres displayed values for dry tensile strength and softness which were comparable to that of the multi-ply tissue paper product comprising no non-wood fibre.
  • the results indicate that the multi-ply tissue paper products comprising non-wood fibres will display at least similar properties as the multi-ply tissue paper product comprising no non-wood fibre. Accordingly, the benefits obtained by using non-wood fibres may be obtained while still achieving a satisfactory tissue paper product.
  • Example 4 HYBRID tissue paper product Two-ply tissue paper products intended for use as kitchen towels were formed comprising one ply being produced with structured tissue technology and one ply being produced with CWP (Conventional Wet Pressed) technology.
  • CWP Conventional Wet Pressed
  • a reference two-ply tissue paper product comprising 0% non-wood fibres was formed from one tissue paper material ply produced by TAD technology being TP1 as described in Example 2 in the above, and one tissue paper material ply produced by CWP technology being G3-A as described in Example 3 in the above.
  • a two-ply tissue paper product comprising 25% non-wood fibres was formed from one tissue paper material ply produced by TAD technology and comprising 30% by dry weight non-wood fibre being TP3 as described in example 2 in the above, and one tissue paper material ply produced by CWP technology comprising 20% by dry weight non-wood fibre, being G3-B as described in example 3 in the above.
  • the two-ply tissue paper products were assembled by nesting.
  • Fig. 4 is a diagram over the absorption values of the two two-ply tissue paper products HYB 1 and HYB2. As seen from the table above and in Fig. 4, the absorption of the multi ply tissue paper product comprising 25% by dry weight of the non-wood fibres was even better than the absorption of the multi-ply tissue paper product comprising no non-wood. Also, as indicated in the table in the above, the multi-ply tissue paper product comprising non-wood fibres displayed values for dry tensile strength and softness which were comparable to that of the multi-ply tissue paper product comprising no non-wood fibre.
  • Two-ply tissue paper products comprising two plies made by TAD technology and similar to 2P-1 and 2P-2, as obtained in the above Example 2, were used as a starting point.
  • the assembly of the two plies in each product was varied by varying the nip used when nesting the two plies together.
  • one two-ply product with original thickness, one two-ply product with increased thickness, and one two-ply product with decreased thickness was formed for each of the qualities 2P-1 and 2P-2, as indicated in the above.
  • the absorption of the two-ply paper tissue product 2P-2 comprising non-wood fibres is higher than the absorption the two-ply paper tissue product 2P-1 comprising no non-wood fibres for all of the various thicknesses.
  • the results indicate that the multi-ply tissue paper products comprising non-wood fibres will display at least similar properties as the multi-ply tissue paper product comprising no non-wood fibre. Accordingly, the benefits obtained by using non-wood fibres may be obtained while still achieving a satisfactory tissue paper product.
  • tissue paper materials and tissue paper products were achieved for specific examples of tissue paper materials and tissue paper products, the finding that the non-wood cellulose pulp fibres and the non-wood plies as described herein are indeed suitable for forming tissue paper materials and tissue paper products may be applied to a wide range of such materials and products.
  • Tissue paper material As tissue paper material we understand herein the one-ply base tissue as obtained from a tissue machine.
  • Layer The tissue paper material may comprise one or more layers, i.e. it may be a single layered or a multi-layered web.
  • the term “layer” refers to a stratum within the web having a defined fibre composition.
  • the one or more layers is/are formed by depositing one or more streams of pulp furnishes onto a wire with a pressurized single-or multi-layered headbox.
  • Ply refers to the one or more plies of tissue paper material in the final tissue paper product as are obtained after processes, i.e. converting, one or more base tissue webs. Each individual ply consists of a tissue paper material comprising one or more layers, e.g. one, two, or three layers.
  • Hardwood As hardwood we understand herein fibrous pulp derived from the woody substance of deciduous trees (angiosperms). For example, hardwood includes eucalyptus. Typically, hardwood fibres are relatively short fibres. For example, the hardwood fibres may have an average fibre length less than 1700 pm. The hardwood fibres may for example have a diameter of 15 to 40 pm and a wall thickness of 3 to 5 pm.
  • Softwood as softwood we understand fibrous pulp derived from the woody substance of coniferous trees (Gymnosperms).
  • softwood fibres are relatively long fibres.
  • the softwood fibres may have an average fibre length above 1700 pm, such as above 1950 micron, for example the softwood fibres may have an average fibre length in a range from 1700 to 2500. pm.
  • the softwood fibres may for example have a diameter of from 30 to 80 pm, and a wall thickness of from 2 to 8 pm.
  • Conventional short fibres As conventional short fibres we understand herein hardwood fibres as described in the above. Generally, the conventional short fibres may have an average fibre length less than 1700 pm.
  • Conventional long fibres As conventional long fibres we understand herein softwood fibres as described in the above. Generally, the conventional long fibres may have an average fibre length greater than 1700 pm.
  • CWP & structured tissue technology As described in the above, paper tissue webs can be produced in several ways. Conventional paper machines have been used for many years for that purpose, to produce such conventional webs at a relatively low cost.
  • An example of a conventional paper tissue web process is the dry crepe process which involves creping on a drying cylinder, the so-called yankee cylinder, by means of a crepe doctor. Wet creping can be used as well, if there are lower demands on the tissue quality. The creped, finally dry raw tissue paper, the so-called base tissue, is then available for further processing into the paper product for a tissue paper product.
  • CWP technology Conventional Wet Pressed technology refers to conventional paper web processes, in which the tissue is formed on a forming fabric and dewatered by pressing with one or more pressure roll nips. The process may involve transfer of the sheet to a Yankee dryer and removing the sheet from the Yankee surface by a doctor blade in a creping process.
  • CWP technology as used herein includes for example dry crepe technology, wet crepe technology, and flat NTT (New Tissue Technology).
  • structured tissue technology relates to the newer technologies for producing a structured tissue web. Such methods will not employ the high pressure used to dewater the web in the CWP process. Therefore, structured tissue technology is sometimes referred to as non-compressing de-watering technology.
  • the structured tissue technology may for example be TAD (Thru-Air-Dried), UCTAD (Uncreped- Through-Air-Dried) or ATMOS (Advanced-Tissue- Molding-System), textured NTT, QRT, PrimeLineTEX technology and eTAD technology.
  • TAD is known from US5853547; and ATMOS from US 7744726, US7550061 and US7527709; and UCTAD from EP 1 156925 and WO 02/40774.
  • TAD technology has been developed since the 1960’s and is well known to a person skilled in the art. It generally involves developing functional properties of the tissue by moulding the fibre mat on a structured fabric. This results in the fibre mat forming a structured tissue which may acquire high bulk and absorption due to air passing through the web while drying the web when still on the structured fabric.
  • ATMOS technology is a production method developed by Voith and which is also well known to a person skilled in the art.
  • Another example is textured NTT (New Tissue Technology). Textured NTT was designed to overcome some of the limitations of ATMOS by pressing at even higher pressures before transferring to the Yankee. A shoe press is used in the first pressing section between the former felt and a belt with cells designed to provide absorptive capacity and increase strength. The textured NTT technology may reduce the Yankee Hood drying load as compared to ATMOS.
  • Prime Line Tex technology as rendered available by Andritz for production of textured tissue
  • eTAD technology as rendered available by Valmet.
  • Pulps-Determination of lignin content - Method of acid hydrolysis 1 which includes: i) the gravimetric measurement of the residue after acid hydrolysis (AIL : Acid Insoluble Lignin or Klason Lignin), also described in the Tappi T222 om-02 method 2 ; and ii) the measurement of soluble lignin (ASL : Acid Soluble Lignin), also described in the technical note Tappi UM2503 .
  • the acid insoluble lignin content in the sample was determined by difference between the dry hydrolysis residue weight and the ash weight, reported to the dry mass content of the initial sample. Note 1 : Detection limit (DL) -0.1% ; Quantification limit (QL) -0.5%.
  • the determination of the contents of the main polysaccharides in the pulp has been made by using high performance anion exchange chromatography with a pulsed amerometric detector, HPAE/PAD-Dionex® analysis of free monosaccharides (arabinose, galactose, glucose, xylose and mannose) after sulphuric acid hydrolysis of the sample pulp.
  • the cellulose and the hemicellulose content in the pulp sample is determined according to standard method ISO / DIS21437 - Pulps: Determination of carbohydrate (under publication) after calibration.
  • the samples studied are chemical pulp which has not required extraction of aceton beforehand. In contrast, the samples have been dried. However, considering the pulp state (wet lap sheets), samples were grinded before analysis. Dry content of the grinded samples was measured according to NF EN ISO 638:2008.
  • the method is quantifying the amounts of sugars (monosaccharides) after hydrolysis of cellulose and hemi using the ISO / DIS 21437 - Pulps: Determination of carbohydrate. Then, calculation is made backwards to estimate level of hemicelluloses (knowing proportion of sugars in hemi and cellulose)
  • Basis weight is determined in accordance with ISO 12625-6: 2016.
  • the basis weight is determined in g/m 2 .
  • Thickness is determined in accordance with ISO 12625-3.
  • GMT strength (Geometric Mean Tensile strength) refers to the square root of the product of the machine direction dry tensile strength and the cross-direction dry tensile strength of a tissue web/product.
  • the GMT strength is determined in accordance with ISO 12625-4.
  • a load cell of 100N was used.
  • Water absorption capacity is the amount of water the sample is able to absorb, reported in g/g (i.e. g water / g material in sample).
  • the water is deionized water, conductivity £ 0.25 mS/m at 25°C, in accordance with I S014487.
  • Panel softness is determined by evaluation made by panel members. The panelists rank products in terms of softness. The Softness Panel values are therefore comparative values enabling a comparison between the samples tested, rather than an absolute parameter.
  • tissue paper products finished goods
  • tissue base sheets are not directly comparable as there are different scales/reference products.
  • Each sample is composed of one product, i.e. a multi-ply tissue paper product.
  • the dimensions of the samples are therefore the dimensions of the finished products.
  • Samples are placed in MD before the panelists.
  • Samples are conditioned for minimum 2 hours in a controlled area at 23°C and 50% relative humidity.
  • the different samples are comfort rated by ten panelists, and an average comfort rating for each product is determined over the panelists.
  • softness panel values are comparative values within a test and indicate the perceived softness of a product.
  • softness panel values given in one and the same table are comparable and indicate the perceived relative softness of the products tested. The higher the value of the rating, the more comfortable is the product.
  • Fibre length measurement was made using the standard for fibre analyser: ISO 16065- 2:2014: Pulps - Determination of fibre length by automated optical analysis - Part 1: Unpolarized light method.
  • Length-weighted mean length was used and the average of the length - weighted fibre- length distribution.
  • the breaking length is a pulp characteristic obtained by tensile strength and basis weight measurements as measured on lab handsheets produced in accordance with EN ISO 5269-2. (Tensile strength: ISO 12625-4; basis weight: ISO 12625-6: 2016) Ratio of breaking length measurement/average fibre length measurement The ratio of breaking length/average fibre length is herein using the values of the fibre length measurement and the breaking length measurements as achieved according to the methods in the above, the average fibre length measurement being reported in pm, and the breaking length being reported in m.
  • the breaking length, as well as the average fibre length are pulp characteristics.
  • the measurements are to be performed on the pulp as received from the pulping process, before reaching the papermaking process, such as before entering the stock preparation in a paper machine.
  • the measurements are done prior to any mechanical and/or chemical and/or enzymatic treatment for strength adjustment which may occur during the paper making process.

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Abstract

Un matériau de papier ouaté à simple épaisseur ayant un poids de base inférieur à 40 gsm et une capacité d'absorption d'au moins 3 g/g, comprenant une épaisseur de tissu non ligneux, ladite épaisseur de tissu non ligneux comprenant des fibres de pâte de cellulose non ligneuses en une quantité supérieure ou égale à 10 % en poids sec de l'épaisseur de tissu non ligneux. La divulgation concerne en outre un produit de papier ouaté à simple épaisseur et un produit de papier ouaté multi-épaisseur.
EP21949472.1A 2021-07-09 2021-07-09 Matériau de papier ouaté et produit de papier ouaté comprenant des fibres non ligneuses Pending EP4367326A1 (fr)

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