EP3688226B1 - Kernlose rolle eines saugfähigen blatts und verfahren zur herstellung davon - Google Patents

Kernlose rolle eines saugfähigen blatts und verfahren zur herstellung davon Download PDF

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Publication number
EP3688226B1
EP3688226B1 EP17822435.8A EP17822435A EP3688226B1 EP 3688226 B1 EP3688226 B1 EP 3688226B1 EP 17822435 A EP17822435 A EP 17822435A EP 3688226 B1 EP3688226 B1 EP 3688226B1
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EP
European Patent Office
Prior art keywords
roll
coating composition
coreless roll
absorbent material
web
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.)
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EP17822435.8A
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English (en)
French (fr)
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EP3688226A1 (de
Inventor
Frédéric ROESCH
Yves Enggasser
Alain Bohn
Nicolas Weisang
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Essity Hygiene and Health AB
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Essity Hygiene and Health AB
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Priority to HUE17822435A priority Critical patent/HUE056988T2/hu
Publication of EP3688226A1 publication Critical patent/EP3688226A1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/28—Wound package of webs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/02—Metal coatings
    • D21H19/06—Metal coatings applied as liquid or powder
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • 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
    • 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
    • A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
    • A47K10/32—Dispensers for paper towels or toilet-paper
    • A47K2010/3206—Coreless paper rolls

Definitions

  • the present invention relates to a coreless roll of an absorbent sheet product such as napkins, toilet paper, towels etc.
  • the coreless roll is provided in a compressed form.
  • the present invention also pertains to a process for the manufacture of the coreless roll.
  • Rolls of absorbent sheet product for home use typically consist of a continuous web of absorbent material that is spirally wound around a prefabricated core made of a stiff material such as cardboard or glued paper.
  • the core defines an axial hollow passageway, which is centrally positioned relative to the roll and extends from one edge of the roll to the other edge.
  • the axial hollow passageway enables the consumer to easily mount the roll on the spindle of a roll holder.
  • the core is expensive, requires storage space and additional manual handling.
  • the core remains after use of the absorbent sheet product, thus increasing the risk of clogging sewage systems.
  • Collapsing refers to the phenomenon occurring when the absorbent sheet product constituting the first inner turns of the roll (i.e. the turns forming the axial hollow passageway at winding start) cannot be stably maintained such that an axial hollow passageway is clearly defined.
  • Coreless rolls are generally associated with an increased risk of "collapsing”. Collapsing typically occurs in the manufacture process of coreless rolls when the temporary core is extracted after completing the winding, or during storage and transport of the finished product. As a consequence of collapsing, it may become difficult to mount the roll on the spindle of a roll holder. Furthermore, collapsing generally creates a feeling of decreased product quality among consumers.
  • a " flexible " roll offers the benefit that it can be provided in a compressed form, which requires less space during storage and transport. As a result, storage and transport costs can be significantly reduced.
  • the roll can be returned from its compressed (oval) form to the uncompressed (cylindrical) form by applying pressure along the longer diameter of the compressed (oval) form, i.e. perpendicular to the axis of the roll.
  • the absorbent sheet product constituting the first inner roll turns must be stably maintained when the roll is returned from the compressed form to the uncompressed form. That is, the axial hollow passageway must open itself and be clearly defined when the roll is returned to the cylindrical form.
  • the roll must hence exhibit substantial flexibility and a certain level of elasticity, which means that the roll can be returned to its cylindrical form while reopening the axial hollow passageway in a clearly defined manner.
  • This requires the first inner turns to newly and stably maintain the axial hollow passageway. As a result, there should be no substantially visible difference in appearance between a roll that has been returned from the compressed form to the uncompressed form and a roll that has not been previously subjected to compression.
  • the roll can be subjected to deformation forces during manufacturing, packaging, storage, transport, e.g. radial forces exerted in the rewinding and/or cutting unit, axial forces occurring during packaging and/or when packaged roll products are stacked on pallets for storage/shipment etc.
  • deformation forces e.g. radial forces exerted in the rewinding and/or cutting unit, axial forces occurring during packaging and/or when packaged roll products are stacked on pallets for storage/shipment etc.
  • the continuous web of absorbent material can be irreversibly deformed, thus creating a feeling of decreased quality among consumers.
  • the roll must also exhibit a certain level of axial and radial stiffness (sometimes also referred to as "rigidity”) meaning that the roll is less likely to be deformed and/or damaged during manufacturing, packaging etc.
  • the prior art describes processes for achieving flexible rolls of absorbent sheet product which can be provided in the compressed form.
  • WO 2009/027874 A1 discloses a roll including a nonwoven tissue web that is spirally wound around a flexible core.
  • the flexible core consists of a polymeric sheet of synthetic polymers, which is attached to the inner layer of the nonwoven tissue web by means of an attachment mechanism such as an adhesive, heat bonding etc.
  • the flexible core is characterized by a higher tensile strength in the machine direction than that of the nonwoven tissue web. As a result, the roll exhibits flexibility for packaging and storage purposes.
  • the polymer sheet of synthetic polymers is prepared beforehand, stored, and manually handled. Furthermore, in the frame of industrial manufacturing, the continuous web of absorbent material is run at a speed of around 10 m/s. This renders the incorporation and attachment of the polymer sheet to the inner layer of the nonwoven tissue web technically complex and difficult to implement at the running speed required for industrial manufacturing.
  • WO 95/13183 A1 discloses a roll of elongated material having a core at the centre of the roll.
  • the core essentially includes a number of turns of the elongated material, which are fixed together by means of a binder such as latex, starch, polyvinyl alcohol etc.
  • WO 95/13183 A1 also discloses a process for producing such roll in the compressed form. More specifically, WO 95/13183 A1 indicates that a binder solution is sprayed or coated on the first turns of a conventional winding. After complete winding and removal from the winding shaft, the roll is immediately compressed to an elliptical or oval section form. The document teaches that the roll can be opened from the compressed position by applying pressure on the "shorter" sides of the ellipse.
  • the binder as described in WO 95/13183 A1 e.g. latex, starch, polyvinyl alcohol etc.
  • the resulting core lacks flexibility and shows low elasticity.
  • the first inner turns of elongated material i.e. the turns of elongated material forming the core
  • the delamination force needed for separating the first inner turns is generally greater than the tear strength of the elongated absorbent material. It is hence difficult to separate the first inner turns without tearing apart the elongated absorbent material on which the binder is applied. As a result, it is not possible to use the elongated absorbent material on its whole length, e.g. up to the last sheet.
  • WO 2011/126707 A2 discloses an aqueous adhesive for roll-shaped paper comprising (A) a saccharide, (B) a viscosity modifier, and (C) a glycol and/or triol.
  • the adhesive of WO 2011/126707 A2 is said to exhibit good initial adhesiveness while it is wet and good peeling ability when it has dried.
  • the paper onto which the adhesive is applied exhibits some stiffness.
  • the roll-shaped paper product lacks flexibility and, after the roll has been compressed, it is difficult to reopen the axial hollow passageway in a manner leading to a well-defined axial hollow passageway.
  • the coreless roll of an absorbent sheet product in the compressed form wherein, after the roll has been compressed, the axial hollow passageway can be reopened in a manner leading to a well-defined axial hollow passageway.
  • the present invention relates to a coreless roll of an absorbent sheet product such as napkins, toilet paper, towels etc. made of a continuous web of absorbent material having a first end and a second end, the continuous web of absorbent material being wound such as to define an axial hollow passageway centrally positioned relative to the coreless roll and extending from one edge to another edge of the coreless roll and such that the first end is located on the outer side of the roll and the second end is located at the axial hollow passageway; wherein the second end of the continuous web of absorbent material comprises a coating composition comprising a nonionic cellulose ether.
  • the present invention also relates to such coreless roll which is provided in the compressed form.
  • the present invention also relates to a process for the manufacture of a coreless roll of an absorbent sheet product comprising the steps of:
  • the nonionic cellulose ether has a number-average molecular weight of 1,000 to 1,000,000, preferably of 2,000 to 500,000, more preferably of 3,000 to 200,000, more preferably 5,000 to 100,000.
  • the nonionic cellulose ether is an alkyl cellulose ether such as methyl cellulose or ethyl cellulose. In yet another aspect of the present invention, the nonionic cellulose ether is a hydroxyalkyl cellulose ether such as hydroxyethyl cellulose or hydroxypropyl cellulose.
  • the coreless roll of an absorbent sheet product of the present invention is distinguished by an excellent stiffness and resistance to collapsing, while being as well sufficiently flexible and elastic. Moreover, the coreless roll of the present invention also exhibits excellent disintegrability in water and can be used up over its whole length.
  • the present invention includes the following embodiments ("Items"):
  • Figures 1 to 4b give a survey on the terminology used with respect to the coreless roll of embodiments of the present invention.
  • the following reference numbers represent:
  • Figure 5 Schematic drawing showing a cross-section view of a converting machine (9) illustrating the manufacturing of coreless rolls according to one embodiment of the invention.
  • Figure 5 shows the application of the coating composition onto the continuous web of absorbent material by spraying.
  • Figure 6 Schematic drawing showing a cross-section view of a converting machine (9) illustrating the manufacturing of coreless rolls according to another embodiment of the invention.
  • Figure 6 shows the application of the coating composition onto the continuous web of absorbent material by roll-coating.
  • FIGS. 7a, 7b and 7c Schematic drawings of an apparatus (dynamometer) (39) and a shaft assembly (40)-(43) suitable for measuring the intersheet adhesion (delamination force) of a tissue paper roll (44) according to the present invention.
  • the dimensions in Figs. 7a-7c are given in mm.
  • the coreless roll of an absorbent sheet product of the present invention is made of a spirally wound continuous web of absorbent material having a first end and a second end.
  • the continuous web of absorbent material is preferably made of a base tissue paper which can be obtained by the Conventional Wet Press or the Through Air Drying (TAD) manufacturing method or other manufacturing methods.
  • base tissue paper tissue paper web
  • the base tissue paper has a low basis weight, in the range of 8 to 60 g/m 2 , preferably 10 to 30 g/m 2 .
  • tissue paper in the final tissue paper product (e.g. toilet paper) as is/are obtained after processing ("converting") one or more base tissue paper webs.
  • tissue production is counted among the papermaking techniques.
  • the production of tissue is distinguished from paper production by its extremely low basis weight and its much higher tensile energy absorption index.
  • the tensile energy absorption index is arrived at from the tensile energy absorption in which the tensile energy absorption is related to the test sample volume before inspection (length, width, thickness of sample between the clamps before tensile load). Paper and tissue paper also differ in general with regard to the modulus of elasticity that characterizes the stress-strain properties of these planar products as a material parameter.
  • a tissue's high tensile energy absorption index results from outer or inner creping.
  • the former is produced by compression of the paper web adhering to a dry cylinder as a result of the action of a crepe doctor or in the latter instance as a result of a difference in speed between two wires ("fabrics").
  • fabrics two wires
  • a high tensile energy absorption index can also be achieved by imparting to the tissue a 3D structure by means of the wires themselves. Most of the functional properties typical of tissue and tissue products result from the high tensile energy absorption index (see DIN EN 12625-4 and DIN EN 12625-5).
  • tissue paper Typical properties include the ready 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, a high specific volume with a perceptible thickness, as well as high liquid absorbency and, depending on the application, a suitable wet and dry strength as well as an interesting visual appearance of the outer product surface.
  • tissue paper to be used, for example, as cleaning cloths (e.g. household towels), sanitary products (e.g. toilet paper, hand towels) and wipes (e.g. cosmetic wipes, facial tissues).
  • the continuous web of absorbent material is preferably composed of 1 tissue paper ply or 2 to 5 superposed tissue paper plies.
  • the tissue paper can be produced from paper-making fibers according to "Conventional Processes” as in the manufacture of "Dry Crepe Tissue” or " Wet Crepe Tissue” or “Processes for Structured Tissue” such as the Through Air Drying (TAD) manufacturing method, the manufacture of uncreped through-air dried (UCTAD) tissue, or alternative manufacturing methods, e.g. the Advanced Tissue Molding System (ATMOS) of the company Voith, or Energy Efficient Technologically Advanced Drying eTAD of the company Georgia Pacific, or Structured Tissue Technology SST of the company Metso Paper.
  • ATMOS Advanced Tissue Molding System
  • Hybrid processes like NTT (New textured Tissue) which are alterations of the conventional processes can be used, too.
  • the conventional dry crepe manufacturing method comprises:
  • the creping operation creates undulations in the sheet across its direction of travel.
  • the creping operation increases the thickness of the sheet, and confers elasticity and gives touch (soft touch) properties to the sheet.
  • the TAD manufacturing method comprises:
  • the dried sheet may be creped.
  • tissue web (as preferred embodiment of the continuous web of absorbent material to be used)
  • a process as described in WO 2016/173641 A1 (title: "Tissue paper comprising pulp fibers originating from Miscanthus and method for manufacturing the same", incorporated herein by reference) can be used.
  • TAD process e.g. 3-D-shaped fabric, permeable drying cylinder, etc.
  • the parameters described in this passage are also valid for the use of the ATMOS technology.
  • tissue paper has been manufactured, a distinct manufacturing operation called converting operation is typically employed to form the tissue paper product (i.e. the paper towel, toilet tissue rolls, bathroom tissue, wiping tissue, kitchen tissue rolls, handkerchiefs, etc.).
  • converting operation is typically employed to form the tissue paper product (i.e. the paper towel, toilet tissue rolls, bathroom tissue, wiping tissue, kitchen tissue rolls, handkerchiefs, etc.).
  • the absorbent material is a "nonwoven material".
  • nonwoven is very common in the art and can be further defined in the manner described in ISO 9092:2011, also for the purpose of the present invention.
  • Typical nonwoven manufacturing techniques include the air-laid technology, spun-laid technology, dry-laid technology, and wetlaid long fibers technology.
  • the nonwoven web used according to this embodiment can be a single ply or multi-ply web.
  • the absorbent nonwoven-based web used in the coreless roll of the invention comprises cellulosic fibers.
  • the content of the cellulosic fibers based on the total weight of all fibers present in the nonwoven web, is at least 20 wt.-%, more preferably at least 50 wt.-%, for instance at least 80 wt.-%.
  • the remaining fibers are in these cases non-cellulosic fibers such as synthetic fibers.
  • the aforementioned paper-making fibers can be produced from virgin and/or recycled paper pulp raw material.
  • the cellulosic fibers which can be used in the invention typically contain as main structure-building component the long chain fibrous cellulose portion which is present in naturally occurring cellulose-containing cells, in particular those of lignified plants.
  • the fibers are isolated from lignified plants by digestion steps removing or reducing the content of lignin and other extractables and optional bleaching steps.
  • the cellulosic fibers can also stem from non-wood sources such as annual plants.
  • Suitable cellulosic fibers which can be used may be of regenerated type (e.g. Lyocell), although the use of other types of pulps is preferred.
  • the pulps employed can be a primary fibrous material ("virgin fibers") or a secondary fibrous material (recycled pulps).
  • the pulp can stem from lignin-free or low lignin sources, such as cotton linters, esparto (alfa) grass, bagasse (e.g. cereal straw, rice straw, bamboo, or hemp), kemp fibers, Miscanthus grass fibers, or flax (also referred to as "non-wood fibers" in the description and the claims).
  • the pulp is produced from lignocellulosic material, such as softwood (which typically originates from conifers) or hardwood (typically from deciduous trees).
  • “Chemical pulps”, as used herein, are, according to DIN 6730, fibrous materials obtained from plant raw materials of which most non-cellulosic components have been removed by chemical pulping without substantial mechanical post treatment.
  • “Mechanical pulp”, as used herein, is the general term for fibrous material made of wood entirely or almost entirely by mechanical means, optionally at increased temperatures. Mechanical pulp can be subdivided into the purely mechanical pulps (groundwood pulp and refined mechanical pulp) as well as mechanical pulps subjected to chemical pre-treatment, such as chemo-mechanical pulp (CMP), or chemo-thermo mechanical pulp (CTMP).
  • CMP chemo-mechanical pulp
  • CTMP chemo-thermo mechanical pulp
  • the continuous web of absorbent material (2) is spirally wound such as to define an axial hollow passageway (3) centrally positioned relative to the roll (1), and which extends from one edge (4) to the other edge (4) of the roll.
  • axial hollow passageway means a tubular opening that extends through the roll along its central axis.
  • the axial hollow passageway enables the end user to mount the roll on the spindle of a roll holder.
  • the absorbent material is dispensed from the first end (located at the outside of the roll) while the roll is allowed to freely rotate about its central axis.
  • the axial hollow passageway has a diameter of from 10 mm to 70 mm, preferably from 20 to 50 mm.
  • the axial hollow passageway (3) extends from one edge (4) to the other edge (4) of the coreless roll.
  • the coreless roll of the present invention has a cylinder-shaped circumferential surface and opposite flat ends (i.e. edges), which are formed when the log roll is cut into multiple rolls at the end of the winding process.
  • edge means the flat portion which is located on one side of the roll perpendicular to its center axis.
  • the continuous web of absorbent material (2) has a first end (5) and a second end (6).
  • the first end (5) is located at the outside of the roll and the second end (6) is located at the axial hollow passageway (3).
  • the continuous web of absorbent material consists, in the machine direction, of the first end and the second end and a middle portion located between these ends.
  • the combined lengths of the first end, the second end and the middle portion define the length of the continuous web of absorbent material which forms one roll.
  • the continuous web of absorbent material web comprises the coating composition specified in this application.
  • the continuous web of absorbent material web is preferably obtained by applying the coating composition to the second end.
  • the resulting continuous web of absorbent material web hence can be distinguished from known continuous webs of absorbent material, e.g. lotioned toilet paper, in which the same coating composition (e.g. lotion) is applied to the entire continuous web.
  • the coating composition in the sense of the invention is applied to the second end of the continuous web of absorbent material while in addition a lotion (which necessarily differs from the coating composition) is applied to one side of the entire continuous web of absorbent material.
  • FIG. 1 Further embodiments of the coreless roll making also use of the concept of the present invention relate to a continuous web of absorbent material obtained by applying the coating composition to the second end thereof wherein a part of the remaining portions, i.e. the first end and the middle portion, preferably less than 20%, more preferably less than 10%, more preferably less than 5% of the total area of the remaining portion also carry a coating composition, such as the same coating composition as applied to the second end..
  • the second end (6) consists of at least one turn, preferably at least two turns, more preferably at least three turns, for instance three to fifty turns, for instance three to thirty turns or four to forty turns, preferably three to thirty turns or ten to forty turns.
  • turn means one circumvolution of the spirally wound continuous web about the axial hollow passageway.
  • Fig. 2 shows for instance three turns at the second end (6) of the web.
  • the second and (6) consists of at least 5%, more preferably at least 10%, more preferably at least 15% of the entire length of the continuous web of absorbent material in the machine direction, and preferably not more than 40%, more preferably not more than 35% of the entire length of the continuous web of absorbent material in the machine direction.
  • the coreless roll of the present invention is provided in a compressed form.
  • compressed form means a form in which the roll cross section has an oval shape.
  • the axial hollow passageway adopts the shape of a thin, typically oval slit and is no longer able to receive the spindle of a roll holder.
  • the coreless roll of the present invention can be returned from the compressed form (oval) to the uncompressed form (cylindrical) by applying pressure along the longer side (diameter) of the oval-shaped roll, i.e. perpendicular to the axis of the roll.
  • a coating composition comprising a nonionic cellulose ether is applied to the second end of the continuous web of absorbent material.
  • the nonionic cellulose ether is described in more detail in section 2.1 below.
  • the coating composition can be applied to the continuous web of absorbent material as an aqueous solution.
  • aqueous solution preferably contains the nonionic cellulose ether in a total amount of at least 0.1 wt.-%, preferably at least 0.5 wt.-%, more preferably at least 1 wt.-% based on the total weight of the aqueous solution.
  • Further additives such as plasticizers, reinforcing agents, fragrance, dyes etc. may also be present. In this case, the preferred contents thereof explained below in connection with component (b) can also be employed (but refer to the total dry content of the aqueous solution).
  • Water is preferably present in an amount which is greater than 50 wt.-%, and more preferably in an amount greater than 65 wt.-%, more preferably greater than 80 wt.-%, based on the total weight of the aqueous solution.
  • This aqueous solution of the coating composition can be applied as it is, preferably at room temperature, to the second end, e.g. by spraying, roll-coating, or any other suitable application method known in the art.
  • the continuous web of absorbent material can be dried, for instance by longer storage at ambient conditions or other suitable techniques known in the art.
  • the coating composition usable in the present invention comprises:
  • the coating composition consists of these ingredients in the stated amounts. In one further preferred embodiment the coating composition consists of the nonionic cellulose ether.
  • the coating composition of the present invention is free of polyether polyol and/or free of other saccharides than the nonionic cellulose ether.
  • saccharide is to be understood broadly and includes monosaccharides, disaccharides, oligosaccharides (at least 3 saccharide units) and polysaccharides such as starch as well as saccharide-based polymers other than the nonionic cellulose ether, e.g. carboxymethyl cellulose (CMC).
  • CMC carboxymethyl cellulose
  • the coating composition is applied onto at least one of the two sides of the continuous web, i.e. the upper and/or the lower side of the continuous longitudinal web.
  • “upper” side we understand the side of the continuous web that is oriented towards the outside of the roll when the web is spirally wound.
  • the coating composition is applied onto the lower side, i.e. the side oriented towards the axial hollow passageway.
  • the coating composition is preferably applied onto the continuous web before it is spirally wound to produce the roll. As a result of winding, the coating composition is applied circumferentially with respect to the axial hollow passageway.
  • the coating composition is preferably applied onto the web such that, with respect to the total area of the second end (i.e. the area carrying the resulting coating), at least 50%, preferably at least 75%, and in particular at least 95% are coated.
  • the coating is applied to the second end of the web intermittently in the machine and/or axial direction, for instance with respect to the individual circumvolutions of the web about the axial hollow passageway, i.e. if one or more circumvolutions are not fully coated when viewed from the edges of the roll, it is also preferred that the area carrying the resulting coating constitutes at least 50% of the total coated area, preferably at least 75%, and in particular at least 95% of the total area of the second end.
  • the coating composition can be applied onto the second end of the continuous web to provide a full or partial coating.
  • full coating means a coating that is applied continuously in the machine and the axial (cross) direction, i.e. the second end of the web does not include any uncoated portions (see e.g. Fig. 3 ).
  • partial coating means that the coating composition is applied onto the continuous web such that it partially covers the surface of the web (i.e. its second end).
  • a partial coating occurs for instance if the coating is applied to the second end of the web intermittently in the machine and/or axial direction.
  • the coating composition can be applied onto the web so as to form predetermined coating patterns. There is no particular limitation to the predetermined coating pattern.
  • the partial coating may form coherent (e.g. stripes, lines, or waves) or separate deposits (e.g. dots, squares, circles or any other geometric shape).
  • the coating is applied intermittently in the machine and/or axial direction, e.g.
  • the coating is applied intermittently in the form of dots as shown in Fig. 4b .
  • the dots can form a regular or irregular pattern, as results e.g. from spraying or roll-coating.
  • the coating composition is intermittently applied such that it covers at least 35% of the second end surface, preferably at least 50% of the second end surface, and more preferably at least 75%, e.g. at least 95% of the total surface of the second end.
  • the coating composition comprises a nonionic cellulose ether to accomplish the desired technical effects.
  • the preferred cellulose ethers to be used can be described as follows.
  • Cellulose ethers are polymers derived from cellulose, which are formed by substituting (fully or partially) the hydroxyl groups of cellulose.
  • the use of one etherification agent (alkylating agent) in the substitution process results in a simple cellulose ether, whereas using different kinds of agents leads to mixed cellulose ethers (mixed ethers).
  • the extent of substitution is described as the degree of substitution (DS) defined as the average number of hydroxyl groups substituted per anhydroglucose unit.
  • the DS can vary between >0 and 3.
  • an etherification (alkylating) agent such as an alkylene oxide etherification agent
  • a new hydroxyl group can be generated, and can further react to give oligomeric chains.
  • the extent of substitution is described as the molar substitution (MS) defined as the average number of moles of etherification agent combined per mole of anhydroglucose unit.
  • the degree of substitution (DS) and the molar substitution (MS) of (ionic or nonionic) cellulose ethers can be determined by techniques known in the art, e.g. by 13 C NMR or by the Zeisel gas chromatography (Zeisel-GC) method as described by Hodges et al. in Anal. Chem., 1979, 51(13), 2172-2176 .
  • Cellulose ethers are divided into two categories, namely ionic cellulose ethers and nonionic cellulose ethers.
  • Cellulose ethers of the ionic type e.g. sodium carboxymethyl cellulose (CMC)
  • CMC carboxymethyl cellulose
  • cellulose ethers of the nonionic type e.g. methyl cellulose, hydroxypropyl cellulose etc.
  • the cellulose ethers used in the present invention are of the nonionic type.
  • nonionic cellulose ethers provide a fine-tuned degree of adhesion between the coating composition and the elongated absorbent material. As a result, it is possible to achieve excellent stiffness and resistance to collapsing as well as sufficient flexibility and elasticity. Furthermore, the delamination force can be maintained in an acceptable range, and hence it is possible to use the elongated absorbent material on its whole length, i.e. up to the last sheet.
  • ionic cellulose ethers such as CMC can adhere strongly to the absorbent material, if they are used in greater amounts, so that the delamination force needed for the separating the first inner turns may become greater than the tear strength of the elongated absorbent material. As a result, it may become difficult to separate the first inner turns without tearing apart the elongated absorbent material.
  • nonionic cellulose ether is to be understood broadly and includes all types of cellulose ethers - e.g. alkyl cellulose ethers, hydroxyalkyl cellulose ethers, alkyl hydroxyalkyl cellulose ethers, and mixed ethers thereof - provided that they are nonionic.
  • the nonionic cellulose ether has a number-average molecular weight of 1,000 to 2,000,000 e.g. 1,000 to 1,000,000, preferably of 2,000 to 800,000 e.g. 2,000 to 500,000, more preferably of 3,000 to 200,000, more preferably 5,000 to 100,000.
  • the number-average molecular weight of the nonionic cellulose ether used in the present invention can be determined by techniques known in the art, such as Gel Permeation Chromatography (GPC).
  • the nonionic cellulose ether has a viscosity-average molecular weight of 5,000 to 2,000,000, preferably of 10,000 to 1,500,000, more preferably of 30,000 to 1,000,000.
  • the viscosity-average molecular weight of the nonionic cellulose ether used in the present invention can be determined by techniques known in the art, such as viscometry.
  • the nonionic cellulose ether is an alkyl cellulose ether such as methyl cellulose or ethyl cellulose.
  • alkyl cellulose ether is to be understood as a (nonionic) cellulose ether, wherein some of the hydroxyl groups of cellulose (at least one hydroxyl group in one individual anhydroglucose unit) are substituted with an alkyl group, i.e. an linear or branched alkyl group having from 1 to 20 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 1 to 6 carbon atoms, in particular a methyl group, an ethyl group or a propyl group.
  • alkyl cellulose ether is meant to encompass alkyl cellulose ethers such as methyl cellulose or ethyl cellulose as well as their mixed ethers such as hydroxyalkyl methyl celluloses, e.g. hydroxyethyl methyl cellulose.
  • the nonionic cellulose ether is an alkyl cellulose ether selected from methyl cellulose (MC), mixed ethers of MC such as hydroxyethyl methyl cellulose (HEMC), hydroxypropyl methyl cellulose (HPMC) and hydroxybutyl methyl cellulose (HBMC), ethyl cellulose (EC), mixed ethers of EC such as hydroxyethyl ethyl cellulose (HEEC), hydroxypropyl ethyl cellulose (HPEC) and hydroxybutyl ethyl cellulose (HBEC).
  • the alkyl cellulose ether is MC, EC, or HPMC, more preferably MC or EC.
  • MC as preferably used herein can have a DS of 1.4 to 2.4, preferably of 1.6 to 2.0.
  • HEMC as preferably used herein can have a (methyl) DS of 1.3 to 2.2 and a (hydroxyalkyl) MS of 0.06 to 0.5.
  • HPMC as preferably used herein can have a DS of 1.1 to 2.0 and a MS of 0.1 to 1.0.
  • HBMC as preferably used herein typically has a DS greater than 1.9 and not more than 2.4 and a MS greater than 0.04 and not more than 0.6.
  • EC as preferably used herein can have a (ethyl) DS of 1.0 to 2.5, preferably a DS of 1.1 to 1.5.
  • the nonionic cellulose ether is a hydroxyalkyl cellulose ether such as hydroxyethyl cellulose or hydroxypropyl cellulose.
  • hydroxyalkyl cellulose ether is to be understood as a (nonionic) cellulose ether, wherein some of the hydroxyl groups of cellulose are substituted with a hydroxyalkyl group, e.g. a linear or branched hydroxyalkyl group having from 1 to 20 carbon atoms, preferably from 1 to 12 carbon atoms, more preferably from 1 to 6 carbon atoms such as a (2-)hydroxypropyl group or a hydroxyethyl group.
  • the nonionic cellulose ether is a hydroxyalkyl cellulose ether selected from hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC) and hydroxybutyl cellulose (HBC).
  • HEC hydroxyethyl cellulose
  • HPC hydroxypropyl cellulose
  • HBC hydroxybutyl cellulose
  • HEC hydroxyalkyl cellulose ether
  • HPC HPC
  • MS of 1.0 to 3.8 preferably of 2.0 to 3.6.
  • nonionic cellulose ether also includes a blend (combination) of at least two, e.g. 2, 3 or 4, different nonionic cellulose ethers, especially a blend of an alkyl cellulose ether and a hydroxyalkyl cellulose ether such as a blend of MC and HPC.
  • the nonionic cellulose ether exhibits a solubility in water at 25°C of at least 40g/l, preferably 200g/l, in particular 500g/l.
  • the solubility of the nonionic cellulose ether in water ensures that the absorbent sheet product of the present invention (in particular toilet paper, etc.) has good flushability and biodegradability. Due to the fairly high solubility of the nonionic cellulose ether it dissolves upon contact with water in the sewage system, or at least quickly forms a dispersion. As a result, sewage systems can be effectively prevented from clogging up.
  • the coreless roll which are normally not disposed via the sewage system such as napkins, towels, e.g. household towels, kitchen towels or hand towels, toilet papers, wipes and facial tissues, this feature is not required but preferred.
  • the amount of nonionic cellulose ether in the coating composition is set such that the nonionic cellulose ether is applied to the second end in an amount of from 0.001 to 20 g/roll, preferably 0.005 to 10 g/roll, more preferably 0.005 to 5 g/roll, in particular 0.01 to 2 g/roll.
  • the amount of nonionic cellulose ether applied to the second end is less than 0.001 g/roll, the desired properties in terms of stiffness and resistance to collapsing may not be fully developed.
  • the amount of nonionic cellulose ether applied to the second end is greater than 20 g/roll, the roll exhibits a high stiffness and resistance to collapsing, but manufacturing costs may become high.
  • the coating composition of the present invention may include a plasticizer, for instance a known plasticizer of an ester type.
  • the plasticizer may contribute to the film-forming properties of the coating composition. It is selected such as to be compatible with the nonionic cellulose ether described above.
  • the coating composition of the present invention is free of plasticizer.
  • plasticizer may be used on its own or two or more types may be used in combination.
  • the content of the plasticizer in the coating composition of the present invention is preferably no greater than 20 wt% of the total solids content, more preferably no greater than 10 wt%, yet more preferably no greater than 5 wt%.
  • the coating composition of the present invention may include a strengthening agent.
  • the coating composition of the present invention is free of strengthening chemical additives, such as strength resins, for instance free of water-soluble cationic or anionic polymers.
  • composition may comprise as appropriate various types of known additives as long as the desired effects are not inhibited.
  • examples include a fragrance, a colorant, a surfactant, an anti-scaling agent, and an anti-bacterial agent as well as inorganic or organic fillers.
  • One type thereof may be used on its own or two or more types may be used in combination.
  • the coreless roll of the present invention has many applications in the field of sanitary or domestic absorbent products.
  • the roll of the present invention can be an absorbent sheet product chosen among the group consisting of napkins, towels such as kitchen towels or hand towels, toilet paper, wipes and facial tissues.
  • the absorbent sheet product is made of a continuous web of absorbent material having a first end and a second end, which consists of at least one ply of base tissue paper with typical basis weight of from 8 to 60 g/m 2 , preferably 10 to 30 g/m 2 .
  • the continuous web of absorbent material is a single ply web made of tissue paper or a multiple-ply web made of e.g. 2 to 5 superposed tissue paper plies.
  • the one-ply base tissues are combined in a converting step to the final ply count, which may be from e.g. 2 to 5 depending on the targeted properties of the final product.
  • the total basis weight of the resulting multiple-ply web preferably does not exceed 120 g/m 2 , and more preferably is lower than 100 g/m 2 , e.g. lower than 90 g/m 2 .
  • the second end of the continuous web is coated with the coating composition of the present invention (i.e. one comprising a nonionic cellulose ether as described above) and spirally wound to achieve a roll of absorbent sheet product, such as a toilet paper roll.
  • the coating composition can be applied onto the second end by using techniques known in the art. "Spraying" and “roll coating” belong to these well-known techniques.
  • the coating composition is applied onto at least one of the two sides of the continuous web, i.e. the upper and/or the lower side of the continuous longitudinal web, or between the base tissue paper plies forming the web.
  • the coating composition can be applied onto one or both sides of one or more plies, e.g. onto all the plies.
  • the coating composition is applied onto one of the outer plies of the web, preferably onto the outer ply which is oriented towards the axial hollow passageway in the finished absorbent sheet product (i.e. the outer ply which is the one closest to the axial hollow passageway).
  • the outer ply can be coated on one or both sides, preferably on its lower side, i.e. the side oriented towards the axial hollow passageway.
  • the absorbent sheet product of the present invention is preferably selected from napkins, towels such as kitchen towels or hand towels, toilet paper, wipes and facial tissues.
  • napkins such as kitchen towels or hand towels
  • toilet paper toilet paper
  • wipes and facial tissues As used herein, "toilet paper” means a soft and strong base tissue paper, which is used to clean the posterior after using the toilet (sometimes also referred to as “bathroom tissue”).
  • the present invention also relates to the use of the coreless roll as toilet paper, household towel, kitchen towel, wipe, facial or napkin.
  • the absorbent sheet product is a toilet paper composed of 2 to 5 superposed tissue paper plies, e.g. 2 to 4 tissue paper plies, in which the coating composition is applied onto at least one outer ply of the continuous web, preferably on the lower side of the outer ply closest to the axial hollow passageway.
  • the dimensions of the coreless roll of the present invention are not limited and depend greatly on the target absorbent sheet product.
  • An individual roll can for instance have a diameter (edge diameter) of from 5 cm to 50 cm, preferably from 8 cm to 20 cm.
  • the axial hollow passageway can have a diameter of from 10 mm to 70 mm, preferably from 20 to 50 mm.
  • the width of the roll i.e. distance between one edge to another edge
  • the continuous web of absorbent material forming the absorbent sheet product preferably has a total length in the machine direction of from 1 m to 60 m, preferably from 1.5 m to 50 m, e.g. 2 m to 40 m.
  • the web can be partially severed in the machine direction such that it consists of consecutive single but coherent sheets.
  • a single sheet can have a length (in the machine direction) of from 80 mm to 300 mm, e.g. 100 mm to 250 mm, especially of from 100 mm to 200 mm.
  • the present invention also relates to a process for the manufacture of a coreless roll as described before and below, the process comprising:
  • the aforementioned process for the manufacture of a coreless roll further comprises: (F) subjecting the coreless roll to compression in a direction perpendicular to the axial hollow passageway to produce a coreless roll in a compressed form.
  • the coreless roll of the present invention can be manufactured by using a commercially available converting machine.
  • a suitable converting machine is available, for example, from the Paper Converting Machine Company (PCMC), Europe.
  • the process for the manufacture of a coreless roll comprises the steps of:
  • compression means that a pressure is applied on the roll in a direction perpendicular to the axial hollow passageway so as to produce a roll having an oval cross section, which requires less storage space. Roll compression occurs preferably immediately after winding has been terminated.
  • An appropriate device known in the art can be used to operate the compression. In the present invention, it is possible to use for example the two converging synchronically driven conveyor bands described in WO 95/13183 , a pneumatic or hydraulic pressing plate, or other devices.
  • the basis weight was determined according to EN ISO 12625-6:2005, Tissue Paper and Tissue Products, Part 6: Determination of grammage.
  • the measurement is made by a precision micrometer (precision 0.001 mm) according to a modified method based on EN ISO 12625-3:2014, Part 3. For this purpose, the distance created between a fixed reference plate and a parallel pressure foot is measured.
  • the diameter of the pressure foot is 35.7 ⁇ 0.1 mm (10.0 cm 2 nominal area).
  • the pressure applied is 2.0 kPa ⁇ 0.1 kPa.
  • the pressure foot is movable at a speed rate of 2.0 ⁇ 0.2 mm/s.
  • a usable apparatus is a thickness meter type L & W SE050 (available from Lorentzen & Wettre, Europe).
  • the tissue paper product to be measured is cut into pieces of 20 x 25 cm and conditioned in an atmosphere of 23°C, 50 % RH (Relative Humidity) for at least 12 hours.
  • one sheet is placed beneath the pressure plate which is then lowered.
  • the thickness value for the sheet is then read off 5 seconds after the pressure has been stabilized.
  • the thickness measurement is then repeated nine times with further samples treated in the same manner.
  • the mean value of the 10 values obtained is taken as thickness of one sheet ("one-sheet caliper") of the tissue paper product (e.g. a two-ply toilet paper) measured.
  • the measurement is made by Gel Permeation Chromatography (GPC) using a PL-GPC 50 Integrated GPC/SEC System equipped with three PL aquagel-OH 8 ⁇ m columns 7.5 x 300 mm (available from Agilent Technologies, Europe).
  • the GPC system was calibrated using a pullulan polysaccharide calibration kit available from Agilent Technologies (for methyl cellulose) or, depending on the cellulose ether to be measured, with a suitable calibration kit such as hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropylmethyl cellulose calibration kits all available from American Polymer Standards Corporation, USA.
  • a sample of the nonionic cellulose ether to be measured was dissolved in water at a concentration of 2 mg/mL.
  • the sample was injected (injection volume: 100 ⁇ L) and run at a flow rate of 1.0 mL/min and a temperature of 50°C using an aqueous buffer solution 0.05M NaH 2 PO 4 , 0.25M NaCl pH 7 as the eluent.
  • the retention time (min) of the cellulose ether was recorded as a peak.
  • the number-average molecular weight M ⁇ n of the cellulose ether was determined by comparing the recorded retention time with that of standard (calibration) cellulose ethers.
  • the measurement can be conducted as follows by viscometry using an Ubbelodhe capillary viscometer equipped with a capillary having an internal diameter of 0.63 mm (both available from SI Analytics, Europe).
  • the viscometer is suspended in a thermostatic bath for 30 minutes at a temperature of (25 ⁇ 0.1)°C.
  • the flow time (the time taken for the sample solution to flow between the two calibrated marks) is measured.
  • the measurement is repeated five times and the mean value of the five values obtained is taken as flow time of the sample solution.
  • the same measurement is reproduced with a sample of water (without cellulose ether).
  • the Hagenbach-Couette corrections (as provided by SI Analytics) were subtracted from the measured flow times.
  • the intrinsic viscosity ⁇ can be determined graphically by plotting the relative viscosity (y-axis) against the sample concentration (x-axis) and extrapolating the theoretical straight line backwards to zero concentration (the line cuts the y-axis at the height of the intrinsic viscosity).
  • M ⁇ v ⁇ K ⁇
  • the measurement is made by a vertical dynamometer equipped with a 2.5kN cell.
  • a usable apparatus is a dynamometer type ZwickiLine Z1.0 (available from Zwick Roell, Europe).
  • a roll was placed vertically between the pressure plates (on one of the two flat edges), and pressure was applied in a direction parallel to the axis of the hollow passageway.
  • the roll was compressed between the plates at a constant speed of 60 mm/min.
  • the compression force was measured and plotted against the displacement of the cell (y-axis: compression force; x-axis: cell displacement).
  • the correlation between compression force and cell displacement was determined by linear regression in the elastic domain of the graph. The slope of the linear regression line was taken as the axial stiffness of the roll.
  • the measurement was repeated four times with further samples, and the mean value of the five values obtained is taken as the axial stiffness K ax of the roll.
  • the measurement is made by a vertical dynamometer equipped with a 200N cell.
  • a usable apparatus is a dynamometer type ZwickiLine Z1.0 (available from Zwick Roell, Europe).
  • the roll to be measured was placed horizontally between the pressure plates (on the round edge), and pressure was applied in a direction perpendicular to the axis of the hollow passageway.
  • the roll was compressed between the plates at a constant speed of 60 mm/min.
  • the compression force was measured and plotted against the displacement of the cell (y-axis: compression force; x-axis: cell displacement).
  • the correlation between compression force and cell displacement was determined by linear regression in the elastic domain of the graph.
  • the slope of the linear regression line was taken as the radial stiffness of the roll.
  • the measurement was repeated four times with further samples, and the mean value of the five values obtained is taken as the radial stiffness K rad of the roll.
  • the measurement is made by a vertical dynamometer (39) (ZwickiLine Z1.0) equipped with a shaft assembly (40)-(43), a jaw (45) and a 50N cell (not shown) as depicted in Figures 7a, 7b and 7c .
  • the first inner turns of a coreless roll to be measured (44) were inserted on the upper shaft (41) of the shaft assembly, the outermost paper sheet was unwound and placed on the shaft assembly as shown in Figure 7a , and the outermost paper sheet was inserted into the jaw (45).
  • the turns were unwound at a constant speed of 300 mm/min.
  • the delamination force needed for separating the paper sheets forming the turns was measured and plotted as a function of the displacement of the cell. The maximal force and the average force required to delaminate the sample were recorded within the displacement interval. The delamination force measurement was then repeated four times with further samples.
  • the mean value of the five values of the maximal force obtained is taken as the delamination force of the first inner turns.
  • the disintegrability was determined according to NF Q34-20:1998, Sanitary and Domestic Articles - Bathroom Tissue - Determination of Disintegration.
  • a three-ply base tissue paper (1) (Conventional) having a basis weight of 55.6 g/m 2 and a caliper of 0.62 mm (manufactured by SCA) was used as the continuous web of absorbent material in Reference Example 1 and Examples 1-3.
  • a three-ply base tissue paper (2) (Conventional) having a basis weight of 53.6 g/m 2 and a caliper of 0.63 mm (manufactured by SCA) was used as the continuous web of absorbent material in Reference Example 2 and Examples 4-8.
  • the three-ply base tissue papers (continuous webs) (1) and (2) were prepared with a conventional converting machine by combining a one-ply base tissue paper to the final ply count (3) as follows:
  • a first unwinding unit provided a first ply of base tissue from a first parent roll having a width of 0.6 m.
  • a second unwinding unit provided a second ply of base tissue from a second parent roll having a width of 0.6 m.
  • a third unwinding unit provided a third ply of base tissue from a third parent roll having a width of 0.6 m.
  • the plies of base tissue were fed to an embossing unit.
  • the base tissues were superposed and combined (associated) using an adhesive in the embossing unit in order to form a continuous web of absorbent material.
  • the engraved cylinder performed a double-level engraving into the superposed absorbent log base webs.
  • the adhesive used for ply bonding was Swift®tak 1004 in an amount of 0.5 g/m 2 .
  • the resulting three-ply continuous web of absorbent material (1) or (2) was fed to a rewinding unit.
  • a conventional tissue paper converting machine was adapted to make a toilet paper having three plies.
  • the machine involved two unwinding units, an embossing unit, a rewinding unit, and a log cutting unit.
  • the embossing unit comprised an engraved cylinder, a mating rubber cylinder and a glue dispenser.
  • the engraved cylinder was engraved with a microstructure pattern combining various embossing tips.
  • the glue dispenser comprised a vat, an applicator and a dipping cylinder.
  • the rewinding unit comprised a perforating module, a cutting module, a winding module and an extraction module.
  • the perforating module comprised a perforator roll and a stationary anvil roll.
  • the cutting module comprised a cutting roll and a stationary anvil roll.
  • the rewinding unit was furthermore equipped with a spraying system consisting of four spray guns type WA250 (available from Walther Pilot) having a nozzle diameter of 1.5 mm and working under a pressure of 1.5, 2.0 or 2.5 bars, a vat and pipes feeding the coating composition from the vat to the spray guns.
  • a spraying system consisting of four spray guns type WA250 (available from Walther Pilot) having a nozzle diameter of 1.5 mm and working under a pressure of 1.5, 2.0 or 2.5 bars, a vat and pipes feeding the coating composition from the vat to the spray guns.
  • the spray guns were placed between the cutting module and the winding module such that the coating composition was applied/sprayed on the lower side of the continuous web of absorbent material upstream to a cutting line at the beginning of the log, thus defining the first web end (i.e. the turns of the log/roll close to the axial hollow passageway).
  • the log cutting unit comprised multiple log saws.
  • Various rollers are appropriately positioned in order to control the path of the absorbent log base webs along the converting machine, within and between the various units.
  • the absorbent log base webs travel into the converting machine according to the machine direction (MD) from the unwinding units, towards the embossing unit, towards the rewinding unit and towards the log cutting unit.
  • MD machine direction
  • a control module was coupled to the perforating module, the cutting module and the spray guns by means of an interface.
  • the control module controlled the operations of the perforating module and the cutting module, as well as the appropriate spraying of the coating composition onto the second end.
  • the machine speed was kept throughout the trials at 100 m/min.
  • a three-ply continuous web of absorbent material (1) (basis weight: 55.6 g/m 2 , caliper: 0.62 mm) was produced as described above, conveyed from the embossing unit and fed to the rewinding unit.
  • the continuous web first reached the perforating module, which pinched the web to provide perforation lines transversally orientated relative to the machine direction (MD) and regularly spaced relative to the cross direction (CD).
  • the size of the perforated segment was 4 mm and the size of the unperforated segment was 1 mm.
  • the distance between two perforation lines was 125 mm.
  • the web of absorbent material reached the winding module, in which the web was picked up onto a temporary core (external diameter: 38 mm) using Tissue Tak 604 as "fugitive adhesive".
  • the web was then wound onto the core to form a log having a diameter of 120 mm (corresponding to 140 perforated sheets; approximate total length of the web: 17500 mm).
  • the produced log was separated from the web of absorbent material by the cutting module, which severed the web transversally relative to the MD.
  • the produced log was stored at 20-22°C, relative humidity of 50% for a period of 12 hours.
  • the temporary core was extracted from the log by the extraction module.
  • the produced log was cut parallel to the MD by multiple log saws into multiple individual rolls having a width of 99 mm.
  • a coreless roll was produced in the same manner as described in Reference Example 1 above except that a three-ply continuous web of absorbent material (2) (basis weight: 53.6 g/m 2 , caliper: 0.47 mm) produced as described above, was conveyed from the embossing unit and fed to the rewinding unit.
  • the produced log having a diameter of 120 mm was cut parallel to the MD by multiple log saws into multiple individual rolls having a width of 99 mm.
  • Example 1 (Toilet paper with hydroxypropylmethyl cellulose)
  • a coating composition was prepared by dissolving hydroxypropylmethyl cellulose (HPMC) with viscosity 15cP in water at a concentration of 3.7% by weight. The obtained coating composition was fed to the spray guns and applied at room temperature (22°C).
  • HPMC hydroxypropylmethyl cellulose
  • a coreless roll was produced in the same manner as described in Reference Example 1 above except that, after pinching/severing and before winding the web, the coating composition was applied (sprayed) by means of the spray guns (pressure: 1.5 bars) onto a length of about 1800 mm (i.e. about 15 sheets) upstream from the cutting line.
  • the amount of HPMC applied onto the second end (length: 1800 mm; i.e. about 10% of the entire web length) was 0.019 g/roll (solid content of HPMC applied to one individual roll, i.e. after cutting the log).
  • a coreless roll was produced in the same manner as Example 1 above except that the coating composition was applied onto a length of about 1800 mm at a pressure of 2.5 bars.
  • the amount of HPMC applied onto the second end was 0.081 g/roll (solid content of HPMC applied to one individual roll).
  • a coreless roll was produced in the same manner as Example 1 above except that the coating composition was applied onto a length of about 3500 mm (i.e. about 28 sheets) at a pressure of 2.0 bars.
  • the amount of HPMC applied onto the second end was 0.099 g/roll (solid content of HPMC applied to one individual roll).
  • a coating composition was prepared by dissolving methylcellulose with viscosity 400cP in water at a concentration of 2% by weight. The obtained coating composition was fed to the spray guns and applied at room temperature.
  • a coreless roll was produced in the same manner as described in the Reference Example 2 above except that, after pinching/severing and before winding the web, the coating composition was applied (sprayed) by means of the spray guns (pressure: 2.5 bars) onto a length of about 1800 mm (i.e. about 15 sheets) upstream from the cutting line.
  • the amount of MC applied onto the second end was 0.066 g/roll (solid content of MC applied to one individual roll).
  • a coating composition was prepared by dissolving hydroxyethyl cellulose having a viscosity-average molecular weight of 90,000 (HEC90) in water at a concentration of 6% by weight. The obtained coating composition was fed to the spray guns and applied at room temperature.
  • the coreless roll was produced in the same manner as Example 4 except that the coating composition described above was applied at a pressure of 1.5 bars.
  • the amount of HEC90 applied onto the second end was 0.09 g/roll (solid content of HEC90 applied to one individual roll).
  • a coating composition was prepared by dissolving hydroxyethyl cellulose having a viscosity-average molecular weight of 720,000 (HEC720) in water at a concentration of 4% by weight. The obtained coating composition was fed to the spray guns and applied at room temperature.
  • the coreless roll was produced in the same manner as Example 4 using the coating composition described above.
  • the amount of HEC720 applied onto the second end (length: 1800 mm) was 0.03 g/roll (solid content of HEC720 applied to one individual roll).
  • Example 7 (Toilet paper with hydroxypropyl cellulose)
  • a coating composition was prepared by dissolving hydroxypropyl cellulose having a number-average molecular weight of 10,000 (HPC) in water at a concentration of 6% by weight. The obtained coating composition was fed to the spray guns and applied at room temperature.
  • the coreless roll was produced in the same manner as Example 4 using the coating composition described above.
  • the amount of HPC applied onto the second end (length: 1800 mm) was 0.06 g/roll (solid content of HPC applied to one individual roll).
  • Example 8 (Toilet paper with hydroxypropylmethyl cellulose)
  • a coating composition was prepared by dissolving HPMC in water at a concentration of 3.7% by weight. The obtained coating composition was fed to the spray guns and applied at room temperature.
  • the coreless roll was produced in the same manner as Example 4 except that that coating composition described above was applied at a pressure of 2.0 bars.
  • the amount of HPMC applied onto the second end was 0.042 g/roll (solid content of HPMC applied to one individual roll).
  • a coating composition was prepared by dissolving carboxymethyl cellulose (CMC) Blanose® 7ECL1 (weight-average molecular weight of about 90,000) in water at a concentration of 5% by weight. The obtained coating composition was fed to the spray guns and applied at room temperature.
  • CMC carboxymethyl cellulose
  • Blanose® 7ECL1 weight-average molecular weight of about 90,000
  • the coreless roll was produced in the same manner as Example 4 using the coating composition described above.
  • the amount of CMC applied onto the second end (length: 1800 mm) was about 0.17 g/roll (solid content of CMC applied to one individual roll).
  • Example 1 Untreated - 190 0.41
  • Example 1 HPMC-treated 1800mm 0.019 251 0.43
  • Example 2 HPMC-treated 1800mm 0.081 279 0.53
  • Example 3 HPMC-treated 3500mm 0.066 299 0.46
  • Example 2 Untreated 0.16 No 11
  • Example 4 MC-treated 0.73 No 20
  • Example 5 HEC90-treated 0.64 No 12
  • Example 6 HEC720-treated 0.43 No 13
  • Example 1 CMC-treated 1.75 Yes (5 out of 5) 6
  • the coating composition enables to stably maintain the first inner turns, and therefore the rolls according to the present invention are not prone to collapsing. This can be achieved with fairly low total amounts of nonionic cellulose ether.
  • the rolls according to the present invention can be unwound up to the last sheet without tearing apart and/or damaging the sheets (i.e. no occurrence of perforation breakage and/or sheets damage in the delamination force measurement).
  • the good stiffness properties of the rolls according to the present invention are beneficial during the manufacturing process wherein the rolls are subjected to radial compression (e.g. radial force applied by the log saws in the cutting module), as well as during storage and transport wherein the rolls are subjected to axial compression, e.g. axial forces occurring when packaged roll products are stacked on pallets for storage, shipment etc.
  • radial compression e.g. radial force applied by the log saws in the cutting module
  • axial compression e.g. axial forces occurring when packaged roll products are stacked on pallets for storage, shipment etc.
  • a coating composition containing an ionic cellulose ether (CMC) provided a roll wherein the sheets of the first inner turns strongly adhere (glue) to each other.
  • CMC ionic cellulose ether

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Sanitary Thin Papers (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Claims (17)

  1. Kernlose Rolle eines absorbierenden Blattprodukts, hergestellt aus einer spiralförmig gewundenen Endlosbahn aus absorbierendem Material mit einem ersten Ende und einem zweiten Ende, wobei die Bahn aus absorbierendem Material so gewunden ist, dass sie einen axial hohlen Durchgang definiert, der zentral bezogen auf die kernlose Rolle angeordnet ist, und sich von einer Kante zu einer anderen Kante der kernlosen Rolle so erstreckt, dass das erste Ende an der äußeren Seite der Rolle angeordnet ist und das zweite Ende an dem axial hohlen Durchgang angeordnet ist;
    wobei das zweite Ende der Endlosbahn aus absorbierendem Material eine Beschichtungszusammensetzung umfasst, welche einen nichtionischen Celluloseether umfasst.
  2. Kernlose Rolle nach Anspruch 1, wobei die kernlose Rolle durch Auftragen der Beschichtungszusammensetzung auf das zweite Ende der Endlosbahn aus absorbierendem Material erhältlich ist.
  3. Kernlose Rolle nach Anspruch 1 oder 2, wobei der nichtionische Celluloseether folgendes aufweist:
    (i) ein zahlenmittleres Molekulargewicht von 1.000 bis 1.000.000, vorzugsweise von 2.000 bis 500.000, mehr bevorzugt von 3.000 bis 200.000, mehr bevorzugt von 5.000 bis 100.000; oder
    (ii) ein viskositätsmittleres Molekulargewicht von 5.000 bis 2.000.000, vorzugsweise von 10.000 bis 1.500.000, mehr bevorzugt von 30.000 bis 1.000.000.
  4. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 3, wobei der nichtionische Celluloseether eine Löslichkeit in Wasser bei 25 °C von mindestens 40 g/L aufweist.
  5. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 4, wobei der nichtionische Celluloseether ausgewählt ist aus:
    (a) einem Alkylcelluloseether wie beispielsweise Methylcellulose oder Ethylcellulose;
    (β) einem Hydroxyalkylcelluloseether wie beispielsweise Hydroxyethylcellulose oder Hydroxypropylcellulose; und (γ) einer Kombination aus einer Alkylcellulose und einem Hydroxyalkylcelluloseether.
  6. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 5, wobei die Beschichtungszusammensetzung folgendes umfasst:
    (a) mindestens 50 Gew.-%, vorzugsweise mindestens 65 Gew.-%, mehr bevorzugt mindestens 80 Gew.-% des nichtionischen Celluloseethers;
    (b) nicht mehr als 50 Gew.-%, vorzugsweise nicht mehr als 35 Gew.-%, mehr bevorzugt nicht mehr als 20 Gew.-% an zusätzlichen Additiven wie beispielsweise Weichmacher, Verstärkungsmittel, Duftstoff und Farbstoffe;
    jeweils bezogen auf den gesamten Feststoffgehalt der Beschichtungszusammensetzung.
  7. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 6, wobei die Beschichtungszusammensetzung als eine wässrige Lösung aufgetragen wird, wobei die wässrige Lösung vorzugsweise den nichtionischen Celluloseether in einer Menge von mindestens 0,1 Gew.-%, mehr bevorzugt mindestens 0,5 Gew.-%, enthält, bezogen auf das Gesamtgewicht der wässrigen Lösung.
  8. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 7, wobei die Beschichtungszusammensetzung frei von Polyetherpolyol und/oder frei von anderen Sacchariden mit Ausnahme des nichtionischen Celluloseethers ist.
  9. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 8, wobei der axial hohle Durchgang einen Umfang aufweist und die Beschichtungszusammensetzung in Umfangsrichtung aufgetragen ist und vorzugsweise so aufgetragen ist, dass die resultierende Beschichtung mindestens 50% des zweiten Endes, vorzugsweise mindestens 75%, mehr bevorzugt mindestens 95% des zweiten Endes bedeckt.
  10. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 9, wobei die Beschichtungszusammensetzung kontinuierlich in der Maschinen- und axialen Richtung oder periodisch in der Maschinen- und/oder axialen Richtung aufgetragen ist.
  11. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 10, wobei das zweite Ende aus Folgendem besteht:
    (a1) mindestens einer Runde, vorzugsweise mindestens zwei Runden, vorzugsweise mindestens drei Runden, zum Beispiel 3 bis 50 Runden, zum Beispiel 3 bis 30 Runden oder 4 bis 40 Runden, vorzugsweise 3 bis 30 Runden, wobei eine Runde eine Umwicklung der spiralförmig gewundenen Endlosbahn um den axial hohlen Durchgang ist; oder
    (a2) mindestens 5%, vorzugsweise mindestens 10%, mehr bevorzugt mindestens 15% der gesamten Länge der Endlosbahn aus absorbierendem Material in der Maschinenrichtung.
  12. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 11, wobei die Menge des nichtionischen Celluloseethers 0,001 bis 20 g/Rolle, vorzugsweise 0,005 bis 10 g/Rolle, mehr bevorzugt 0,005 bis 5 g/Rolle, insbesondere 0,01 bis 2 g/Rolle beträgt.
  13. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 12, wobei die Bahn aus absorbierendem Material aus 1 Hygienepapierlage aufgebaut ist oder 2 bis 6, insbesondere 2 bis 5 übereinanderliegenden Hygienepapierlagen.
  14. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 13, die in einer komprimierten Form vorliegt.
  15. Kernlose Rolle nach mindestens einem der Ansprüche 1 bis 14, welche ein absorbierendes Produkt ist, ausgewählt aus der Gruppe umfassend Windeln, Tüchern wie beispielsweise Haushaltstüchern, Küchenpapier oder Handtüchern, Toilettenpapier, Reinigungstüchern, Taschentüchern und Gesichtstüchern, wobei dieses absorbierende Produkt vorzugsweise ein Toilettenpapier ist.
  16. Herstellungsverfahren zur Herstellung einer kernlosen Rolle eines absorbierenden Blattprodukts, welches die folgenden Schritte umfasst:
    • eine Endlosbahn aus absorbierendem Material mit einem ersten Ende und einem zweiten Ende wird zugeführt, welches vorzugsweise aus 1 Hygienepapierlage aufgebaut ist oder 2 bis 6, insbesondere 2 bis 5 übereinanderliegenden Hygienepapierlagen;
    • optional wird die Endlosbahn aus absorbierendem Material im Wesentlichen transversal zu der Maschinenrichtung so durchtrennt, dass einzelne aber zusammenhängende Blätter erzeugt werden;
    • eine Beschichtungszusammensetzung wie in mindestens einem der Ansprüche 1 bis 12 definiert wird auf das zweite Ende aufgetragen;
    • die Endlosbahn aus absorbierendem Material wird so spiralförmig gewunden, dass ein Stamm aus der Bahn aus absorbierendem Material hergestellt wird, wobei die Bahn aus absorbierendem Material so gewunden wird, dass sie einen axial hohlen Durchgang definiert, der zentral bezogen auf den Stamm angeordnet ist, und sich von einer Kante zu einer anderen Kante des Stamms so erstreckt, dass das erste Ende an der äußeren Seite des Stamms angeordnet ist und das zweite Ende an dem axial hohlen Durchgang angeordnet ist;
    • der Stamm wird in mehrere kernlose Rollen geschnitten; und
    • optional wird die kernlose Rolle einer Kompression in einer Richtung senkrecht zu dem axial hohlen Durchgang ausgesetzt und so eine kernlose Rolle in einer komprimierten Form hergestellt.
  17. Verwendung der kernlosen Rolle nach mindestens einem der Ansprüche 1 bis 14 als Toilettenpapier, Haushaltstuch, Handtuch, Küchenpapier, Reinigungstuch, Gesichtstuch, Taschentuch oder Serviette.
EP17822435.8A 2017-09-29 2017-09-29 Kernlose rolle eines saugfähigen blatts und verfahren zur herstellung davon Active EP3688226B1 (de)

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CN115715342A (zh) * 2020-07-03 2023-02-24 易希提卫生与保健公司 棉纸产品的无芯卷及制造无芯卷的方法
MX2023000047A (es) * 2020-07-03 2023-02-22 Essity Hygiene & Health Ab Productos de papel tisu, rollos y pilas de productos de papel tisu, y metodos de fabricacion.
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US20240158194A1 (en) 2022-11-10 2024-05-16 Paper Converting Machine Company Method and Apparatus for Producing Coreless Roll Products

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CN111133148B (zh) 2021-07-13
HUE056988T2 (hu) 2022-04-28
ES2902524T3 (es) 2022-03-28
EP3688226A1 (de) 2020-08-05
MX2020003645A (es) 2020-07-29
CN111133148A (zh) 2020-05-08
WO2019064046A1 (en) 2019-04-04
CO2020003117A2 (es) 2020-05-15
RU2751637C1 (ru) 2021-07-15
ECSP20021766A (es) 2020-05-29

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