WO2018201021A1 - Serviette jetable produite avec des creux de surface de grand volume - Google Patents

Serviette jetable produite avec des creux de surface de grand volume Download PDF

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Publication number
WO2018201021A1
WO2018201021A1 PCT/US2018/029905 US2018029905W WO2018201021A1 WO 2018201021 A1 WO2018201021 A1 WO 2018201021A1 US 2018029905 W US2018029905 W US 2018029905W WO 2018201021 A1 WO2018201021 A1 WO 2018201021A1
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WO
WIPO (PCT)
Prior art keywords
product
web
fabric
tissue
structured fabric
Prior art date
Application number
PCT/US2018/029905
Other languages
English (en)
Inventor
Louis Lebrun
Byrd Tyler MILLER IV
Justin C. PENCE
James E. Ii Sealey
Original Assignee
Structured I, Llc
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
Priority claimed from US15/499,513 external-priority patent/US10538882B2/en
Application filed by Structured I, Llc filed Critical Structured I, Llc
Priority to CA3060671A priority Critical patent/CA3060671A1/fr
Priority to MX2019012814A priority patent/MX2019012814A/es
Publication of WO2018201021A1 publication Critical patent/WO2018201021A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/04—Cellulosic plastic fibres, e.g. rayon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • B32B2262/065—Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • B32B2262/067—Wood fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/14—Mixture of at least two fibres made of different materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/546—Flexural strength; Flexion stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2555/00—Personal care
    • 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
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped

Definitions

  • the present invention relates to a disposable two-ply tissue or paper towel with unique surface topography and large volume surface depressions.
  • Softness is the pleasing tactile sensation the consumer perceives when using the tissue product as it is moved across his or her skin or crumpled in his or her hand.
  • the tissue physical attributes which affect softness are primarily surface smoothness and bulk structure.
  • An object of the present invention is to provide a disposable tissue or paper towel with unique and quantifiable surface topography attributes.
  • a disposable tissue or paper towel product comprises at least two plies, an exposed outer surface of at least one of the two plies comprising a plurality of pockets, the plurality of pockets having an average volume greater than 0.4 mm 3 and an average surface area of 2.5 mm 2 .
  • a disposable tissue or paper towel product comprises at least two plies, an exposed outer surface of at least one of the two plies comprising a plurality of pockets, the plurality of pockets having an average volume greater than 0.4 mm 3 and an average surface area of 2.5 mm 2 , the disposable tissue or paper towel product having a basis weight less than 43 gsm.
  • a disposable tissue or paper towel product comprises at least two plies, an exposed outer surface of at least one of the two plies comprising a plurality of pockets, the plurality of pockets having an average volume greater than 0.4 mm 3 , the disposable tissue or paper towel product having a basis weight less than 45 gsm.
  • the product is formed using a structured fabric of a through air dying process.
  • the product is formed using one of the following types of wet-laid forming processes: Through Air Drying (TAD), Uncreped Through Air Drying (UCTAD), Advanced Tissue Molding System (ATMOS), NTT, and ETAD.
  • TAD Through Air Drying
  • UTAD Uncreped Through Air Drying
  • ATMOS Advanced Tissue Molding System
  • NTT NTT
  • ETAD ETAD
  • the at least two plies are laminated together.
  • the at least two plies are laminated together with heated adhesive.
  • the structured fabric is made of warp and weft monofilament yarns.
  • the diameter of the warp monofilament yarn is 0.40 mm.
  • the diameter of the weft monofilament yarn is 0.550 mm.
  • the diameter of the warp monofilament yarn is 0.30 mm to 0.550 mm.
  • the diameter of the weft monofilament yarn is 0.30 to 0.550 mm.
  • the through air drying process comprises transferring a web that forms the at least one of the two plies from a forming wire to the structured fabric at a 5% or more speed differential.
  • FIG. 1 is a schematic diagram of a three layer ply formed by a wet laid process for use in an exemplary embodiment of the present invention
  • FIG. 2 is a block diagram of a system for manufacturing one ply of a laminate according to an exemplary embodiment of the present invention
  • FIG. 3 is a block diagram of a system for manufacturing a multi-ply absorbent product according to an exemplary embodiment of the present invention
  • FIG. 4 is a screenshot illustrating a method of determining pocket volume and surface area of a tissue or towel surface using a Keyence VR 3200 Wide Area 3D Measurement Macroscope;
  • FIG. 5 is a topographical view of a structuring belt utilizing a plain weave
  • FIG. 6 is a topographical view of a structuring belt utilizing a satin weave
  • FIG. 7 A is a topographical view of a structuring belt utilizing a twill weave
  • FIGS. 7B and 7C illustrate left handed and right handed twill weave patterns
  • FIG. 8 is a perspective view of a fabric with a left handed and right handed twill weave according to an exemplary embodiment of the present invention.
  • a disposable structured tissue or paper towel product includes two or more plies of absorbent products/web, where each ply is produced using a unique set of operating conditions and structured fabric, thereby resulting in a paper towel or tissue product with large volume depressions or "pockets" across its surface.
  • a disposable structured tissue or paper towel product is made using a structured fabric of a through air drying process in which a nascent web is transferred from a forming wire to the structured fabric at a speed differential of 0% to 20%, preferably 0% to 10%, and more preferably 0% to 5%.
  • the speed differential is 5%.
  • the structured fabric is made of warp and weft monofilament yarns, with the diameter of both the warp and weft yarns being in the range of 0.3 mm to 0.550 mm.
  • the diameter of the warp yarn is 0.40 mm and the diameter of the weft yarn is 0.550 mm.
  • the surface smoothness of a ply/web is primarily a function of the surface topography of the web.
  • the surface topography is influenced by the manufacturing method such as conventional dry crepe, through air drying (TAD), or hybrid technologies such as Metso's NTT, Georgia Pacific's ETAD, or Voith's ATMOS process.
  • TAD through air drying
  • the manufacturing method of conventional dry crepe creates a surface topography that is primarily influenced by the creping process (doctoring a flat, pressed sheet off of a steam pressurized drying cylinder) versus TAD and hybrid technologies which create a web whose surface topography is influenced primarily by the structured fabric pattern that is imprinted into the sheet and secondarily influenced by the degree of fabric crepe and conventional creping utilized.
  • a structured fabric is made up of monofilament polymeric fibers with a weave pattern that creates raised knuckles and depressed valleys to allow for a web with high Z-direction thickness and unique surface topography. Therefore, the design of the structured fabric is important in controlling the softness and quality attributes of the web.
  • U.S. Patent No. 3,301,746 discloses the first structured or imprinting fabric designed for production of tissue.
  • a structured fabric may also contain an overlaid hardened photosensitive resin to create a unique surface topography and bulk structure as shown in U.S. Patent No. 4,529,480.
  • Fabric crepe is the process of using speed differential between a forming and structured fabric to facilitate filling the valleys of the structured fabric with fiber, and folding the web in the Z-direction to create thickness and influence surface topography.
  • Conventional creping is the use of a doctor blade to remove a web that is adhered to a steam heated cylinder, coated with an adhesive chemistry, in conjunction with speed differential between the Yankee dryer and reel drum to fold the web in the Z-direction to create thickness, drape, and to influence the surface topography of the web.
  • the process of calendering, pressing the web between cylinders, will also affect surface topography.
  • the surface topography can also be influenced by the coarseness and stiffness of the fibers used in the web, degree of fiber refining, as well as embossing in the converting process.
  • Added chemical softeners and lotions can also affect the perception of smoothness by creating a lubricious surface coating that reduces friction between the web and the skin of the consumer.
  • the bulk structure of the web is influenced primarily by web thickness and flexibility (or drape).
  • TAD and Hybrid Technologies have the ability to create a thicker web since structured fabrics, fabric crepe, and conventional creping can be utilized while conventional dry crepe can only utilize conventional creping, and to a lesser extent basis weight/grammage, to influence web thickness.
  • the increase in thickness of the web through embossing does not improve softness since the thickness comes by compacting sections of the web and pushing these sections out of the plane of the web. Plying two or more webs together in the converting process, to increase the finished product thickness, is also an effective method to improve bulk structure softness.
  • the flexibility, or drape, of the web is primarily affected by the overall web strength and structure.
  • Strength is the ability of a paper web to retain its physical integrity during use and is primarily affected by the degree of cellulose fiber to fiber hydrogen bonding, and ionic and covalent bonding between the cellulose fibers and polymers added to the web.
  • the stiffness of the fibers themselves, along with the degree of fabric and conventional crepe utilized, and the process of embossing will also influence the flexibility of the web.
  • the structure of the sheet, or orientation of the fibers in all three dimensions, is primarily affected by the manufacturing method used.
  • the predominant manufacturing method for making a tissue web is the conventional dry crepe process.
  • the major steps of the conventional dry crepe process involve stock preparation, forming, pressing, drying, creping, calendering (optional), and reeling the web.
  • This method is the oldest form of modern tissue making and is thus well understood and easy to operate at high speeds and production rates. Energy consumption per ton is low since nearly half of the water removed from the web is through drainage and mechanical pressing. Unfortunately, the sheet pressing also compacts the web which lowers web thickness resulting in a product that is of low softness and quality.
  • the creping process greatly affects softness as the surface topography is dominated by the number and coarseness of the crepe bars (finer crepe is much smoother than coarse crepe). Some thickness and flexibility is also generated during the creping process.
  • the web is optionally calendered and reeled into a parent roll and ready for the converting process.
  • the through air dried (TAD) process is another manufacturing method for making a tissue web.
  • the major steps of the through air dried process are stock preparation, forming, imprinting, thermal pre-drying, drying, creping, calendering (optional), and reeling the web.
  • Imprinting is a step in the process where the web is transferred from a forming fabric to a structured fabric (or imprinting fabric) and subsequently pulled into the structured fabric using vacuum (referred to as imprinting or molding). This step imprints the weave pattern (or knuckle pattern) of the structured fabric into the web.
  • This imprinting step has a tremendous effect on the softness of the web, both affecting smoothness and the bulk structure.
  • the design parameters of the structured fabric are therefore critical to the development of web softness.
  • the web is thermally pre-dried by moving hot air through the web while it is conveyed on the structured fabric. Thermal pre-drying can be used to dry to the web over 90% solids before it is transferred to a steam heated cylinder.
  • the web is then transferred from the structured fabric to the steam heated cylinder though a very low intensity nip (up to 10 times less than a conventional press nip) between a solid pressure roll and the steam heated cylinder.
  • nip up to 10 times less than a conventional press nip
  • the only portions of the web that are pressed between the pressure roll and steam cylinder rest on knuckles of the structured fabric, thereby protecting most of the web from the light compaction that occurs in this nip.
  • the steam cylinder and an optional air cap system, for impinging hot air then dry the sheet to up to 99% solids during the drying stage before creping occurs.
  • the creping step of the process again only affects the knuckle sections of the web that are in contact with the steam cylinder surface.
  • creping process Due to only the knuckles of the web being creped, along with the dominant surface topography being generated by the structured fabric, and the higher thickness of the TAD web, the creping process has much smaller effect on overall softness as compared to conventional dry crepe. After creping, the web is optionally calendered and reeled into a parent roll and ready for the converting process. Examples of patents which describe creped through air dried products includes U.S. Patent Nos. 3,994,771; 4,102,737; 4,529,480 and 5,510,002.
  • a new process/method and paper machine system for producing tissue has been developed by the Voith company (Voith GmbH, of Heidenheim, Germany) and is being marketed under the name ATMOS (Advanced Tissue Molding System).
  • the process/method and paper machine system has several patented variations, but all involve the use of a structured fabric in conjunction with a belt press.
  • the major steps of the ATMOS process and its variations are stock preparation, forming, imprinting, pressing (using a belt press), creping, calendering (optional), and reeling the web.
  • the stock preparation step is the same as a conventional or TAD machine would utilize.
  • the purpose is to prepare the proper recipe of fibers, chemical polymers, and additives that are necessary for the grade of tissue being produced, and diluting this slurry to allow for proper web formation when deposited out of the machine headbox (single, double, or triple layered) to the forming surface.
  • the forming process can use a twin wire former (as described in U.S. Patent No. 7,744,726) a Crescent Former with a suction Forming Roll (as described in U.S. Patent No. 6,821,391), or preferably a Crescent Former (as described in U.S. Patent No. 7,387,706).
  • the preferred former is provided a slurry from the headbox to a nip formed by a structured fabric (inner position/in contact with the forming roll) and forming fabric (outer position).
  • the fibers from the slurry are predominately collected in the valleys (or pockets, pillows) of the structured fabric and the web is dewatered through the forming fabric.
  • This method for forming the web results in a unique bulk structure and surface topography as described in U.S. Patent No. 7,387,706 (Fig. 1 through Fig 11).
  • the fabrics separate after the forming roll with the web staying in contact with the structured fabric. At this stage, the web is already imprinted by the structured fabric, but use of a vacuum box on the inside of the structured fabric can facilitate further fiber penetration into the structured fabric and a deeper imprint.
  • the web is now transported on the structured fabric to a belt press.
  • the belt press can have multiple configurations.
  • the first patented belt press configurations used in conjunction with a structured fabric can be viewed in U.S. Patent No. 7,351,307 (Fig.13), where the web is pressed against a dewatering fabric across a vacuum roll by an extended nip belt press.
  • the press dewaters the web while protecting the areas of the sheet within the structured fabric valleys from compaction.
  • Moisture is pressed out of the web, through the dewatering fabric, and into the vacuum roll.
  • the press belt is permeable and allows for air to pass through the belt, web, and dewatering fabric, into the vacuum roll enhancing the moisture removal.
  • the belt press can have a pressing device arranged within the belt which includes several press shoes, with individual actuators to control cross direction moisture profile, (see Fig. 28 in U.S. Patent Nos. 7,951,269 or 8,118,979 or Fig 20 of U.S. Patent No. 8,440,055) or a press roll (see Fig. 29 in U.S. Patent Nos. 7,951,269 or 8,118,979 or Fig. 21 of U.S. Patent No. 8,440,055).
  • the preferred arrangement of the belt press has the web pressed against a permeable dewatering fabric across a vacuum roll by a permeable extended nip belt press.
  • a hot air hood that includes a steam shower to enhance moisture removal.
  • the hot air hood apparatus over the belt press can be made more energy efficient by reusing a portion of heated exhaust air from the Yankee air cap or recirculating a portion of the exhaust air from the hot air apparatus itself (see U.S. Patent No. 8, 196,314).
  • Further embodiments of the drying system composed of the hot air apparatus and steam shower in the belt press section are described in U.S. Patent Nos. 8,402,673; 8,435,384 and 8,544, 184.
  • the belt press is a second press to nip the web between the structured fabric and dewatering felt by one hard and one soft roll.
  • the press roll under the dewatering fabric can be supplied with vacuum to further assist water removal.
  • This preferred belt press arrangement is described in U.S. Patent No. 8,382,956 and U.S. Patent No. 8,580,083, with Fig. l showing the arrangement.
  • the web can travel through a boost dryer (Fig. 15 of U.S. Patent Nos. 7,387,706 or 7,351,307), a high pressure through air dryer (Fig. 16 of U.S. Patent Nos.
  • U.S. Patent Nos. 7,510,631; 7,686,923; 7,931,781; 8,075,739 and 8,092,652 further describe methods and systems for using a belt press and structured fabric to make tissue products each having variations in fabric designs, nip pressures, dwell times, etc. and are mentioned here for reference.
  • a wire turning roll can be also be utilized with vacuum before the sheet is transferred to a steam heated cylinder via a pressure roll nip (see Fig. 2a of U.S. Patent No. 7,476,293).
  • the sheet is now transferred to a steam heated cylinder via a press element.
  • the press element can be a through drilled (bored) pressure roll (Fig. 8 of U.S. Patent No. 8,303,773), a through drilled (bored) and blind drilled (blind bored) pressure roll (Fig. 9 of U.S. Patent No. 8,303,773), or a shoe press (U.S. Patent No. 7,905,989).
  • the % solids are in the range of 40-50% solids.
  • the steam heated cylinder is coated with chemistry to aid in sticking the sheet to the cylinder at the press element nip and also aid in removal of the sheet at the doctor blade.
  • the sheet is dried to up to 99% solids by the steam heated cylinder and installed hot air impingement hood over the cylinder.
  • This drying process, the coating of the cylinder with chemistry, and the removal of the web with doctoring is explained in U.S. Patent Nos. 7,582,187 and 7,905,989.
  • the doctoring of the sheet off the Yankee, creping is similar to that of TAD with only the knuckle sections of the web being creped.
  • the dominant surface topography is generated by the structured fabric, with the creping process having a much smaller effect on overall softness as compared to conventional dry crepe.
  • the preferred ATMOS process has the following steps: Forming the web using a Crescent Former between an outer forming fabric and inner structured fabric, imprinting the pattern of the structured fabric into the web during forming with the aid of a vacuum box on the inside of the structured fabric after fabric separation, pressing (and dewatering) the web against a dewatering fabric across a vacuum roll using an extended nip belt press belt, using a hot air impingement hood with a steam shower inside the belt press to aid in moisture removal, reuse of exhaust air from the Yankee hot air hood as a percentage of makeup air for the belt press hot air hood for energy savings, use of a second press nip between a hard and soft roll with a vacuum box installed in the roll under the dewatering fabric for further dewatering, transferring the sheet to a steam heated cylinder (Yankee cylinder) using a blind and through drilled press roll (for further dewatering), drying the sheet on the steam cylinder with the aid of a hot air impingement hood over the cylinder,
  • the installed capital cost is only slightly above that of a conventional crescent forming tissue machine and thus nearly half the cost of a TAD machine.
  • the energy costs are equal to that of a conventional tissue machine which are half that of a TAD machine.
  • the thickness of the web is nearly equal to that of a TAD product and up to 100% thicker than a conventional tissue web.
  • the quality of the products produced in terms of softness and strength are comparable to TAD and greater than that produced from a conventional tissue machine.
  • the softness attributes of smoothness and bulk structure are unique and different from that of TAD and conventional tissue products and are not only a result of the unique forming systems (a high percentage of the fibers are collected in the valleys of the structured fabric and are protected from compaction through the process) and dewatering systems (extended nip belted press allows for low nip intensity and less web compaction) of the ATMOS process itself, but also the controllable parameters of the process (fiber selection, chemistry selection, degree of refining, structured fabric used, Yankee coating chemistry, creping pocket angle, creping moisture, and amount of calendering).
  • the ATMOS manufacturing technique is often described as a hybrid technology because it uses a structured fabric like the TAD process, but also uses energy efficient means to dewater the sheet like the conventional dry crepe process.
  • ETAD process and NTT process Other manufacturing techniques which employ the use of a structured fabric along with an energy efficient dewatering process are the ETAD process and NTT process.
  • the ETAD process and products can be viewed in U.S. Patent Nos. 7,339,378; 7,442,278 and 7,494,563.
  • This process can use any type of former such as a Twin Wire Former or Crescent Former.
  • the web After formation and initial drainage in the forming section, the web is transferred to a press fabric where it is conveyed across a suction vacuum roll for water removal, increasing web solids up to 25%. Then the web travels into a nip formed by a shoe press and backing/transfer roll for further water removal, increasing web solids up to 50%.
  • the web is transferred onto the transfer roll and then onto a structured fabric via a nip formed by the transfer roll and a creping roll.
  • speed differential can be used to facilitate fiber penetration into the structured fabric and build web caliper.
  • the web then travels across a molding box to further enhance fiber penetration if needed.
  • the web is then transferred to a Yankee dryer where is can be optionally dried with a hot air impingement hood, creped, calendared, and reeled.
  • the NTT process and products can be viewed in international patent application publication WO 2009/061079 Al .
  • the process has several embodiments, but the key step is the pressing of the web in a nip formed between a structured fabric and press felt.
  • the web contacting surface of the structured fabric is a non-woven material with a three dimensional structured surface comprised of elevation and depressions of a predetermined size and depth.
  • the web is formed into the depression of the structured fabric since the press fabric is flexible and will reach down into all of the depressions during the pressing process.
  • the felt reaches the bottom of the depression, hydraulic force is built up which forces water from the web and into the press felt.
  • the press rolls will have a long nip width which can be accomplished if one of the rolls is a shoe press. After pressing, the web travels with the structured fabric to a nip with the Yankee dryer, where the sheet is optionally dried with a hot air impingement hood, creped, calendared, and reeled.
  • the absorbent products or structures that are used for each of the two or more webs/ plies can be manufactured by any known or later-discovered wet-laid methods that use a structured fabric.
  • wet-laid technologies include Through Air Drying (TAD), Uncreped Through Air Drying (UCTAD), Advanced Tissue Molding System (ATMOS), NTT, and ETAD.
  • the materials used to produce the disposable structured tissue or paper towel product can be fibers in any ratio selected from cellulosic-based fibers, such as wood pulps (softwood gymnosperms or hardwood angiosperms), cannabis, cotton, regenerated or spun cellulose, jute, flax, ramie, bagasse, kenaf, or other plant based cellulosic fiber sources.
  • Synthetic fibers such as a poly olefin (e.g., polypropylene), polyester, or polylactic acid can also be used.
  • Each ply of a multi-ply absorbent product of the present invention may comprise cellulosic based fibers and/or synthetic fibers. Also, all the plies may be made of the same type(s) of fibers or different fibers may be used in some or all of the plies.
  • FIGs. 1 and 2 illustrate a single ply absorbent product and a method for
  • FIG. 1 shows an example of a single ply, three layer tissue generally designated by reference number 1 that has external (exterior) layers 2 and 4 as well as an internal (interior), core layer 3.
  • the three layers of the tissue from top to bottom are labeled as air 4, core 3 and dry (or Yankee) 2.
  • External layer 2 is composed primarily of hardwood fibers 20 whereas external layer 4 and core layer 3 are composed of a combination of hardwood fibers 20 and softwood fibers 21.
  • External layer 2 further includes a dry strength additive 7.
  • External layer 4 further includes both a dry strength additive 7 and a temporary wet strength additive 8.
  • Pulp mixes for exterior layers of the tissue are prepared with a blend of primarily hardwood fibers.
  • the pulp mix for at least one exterior layer is a blend containing about 70 percent or greater hardwood fibers relative to the total percentage of fibers that make up the blend.
  • the pulp mix for at least one exterior layer is a blend containing about 90-100 percent hardwood fibers relative to the total percentage of fibers that make up the blend.
  • Pulp mixes for the interior layer of the tissue are prepared with a blend of primarily softwood fibers.
  • the pulp mix for the interior layer is a blend containing about 70 percent or greater softwood fibers relative to the total percentage of fibers that make up the blend.
  • the pulp mix for the interior layer is a blend containing about 90- 100 percent softwood fibers relative to the total percentage of fibers that make up the blend.
  • pulp mixes are subjected to a dilution stage in which water is added to the mixes so as to form a slurry. After the dilution stage but prior to reaching the headbox, each of the pulp mixes are dewatered to obtain a thick stock of about 95% water.
  • wet end additives are introduced into the thick stock pulp mixes of at least the interior layer.
  • a dry strength additive is added to the thick stock mix for at least one of the exterior layers.
  • the dry strength additive may be, for example, amphoteric starch, added in a range of about 1 to 40 kg/ton.
  • a wet strength additive is added to the thick stock mix for at least one of the exterior layers.
  • the wet strength additive may be, for example, glyoxalated polyacrylamide, commonly known as GPAM, added in a range of about 0.25 to 5 kg/ton.
  • GPAM glyoxalated polyacrylamide
  • both a dry strength additive, preferably amphoteric starch and a wet strength additive, preferably GPAM are added to one of the exterior layers. Without being bound by theory, it is believed that the combination of both amphoteric starch and GPAM in a single layer when added as wet end additives provides a synergistic effect with regard to strength of the finished tissue.
  • exemplary temporary wet-strength agents include aldehyde functionalized cationic starch, aldehyde functionalized polyacrylamides, acrolein co-polymers and cis-hydroxyl polysaccharide (guar gum and locust bean gum) used in combination with any of the above mentioned compounds.
  • suitable dry strength additives may include but are not limited to glyoxalated polyacrylamide, cationic starch, carboxy methyl cellulose, guar gum, locust bean gum, cationic polyacrylamide, polyvinyl alcohol, anionic polyacrylamide or a combination thereof.
  • FIG. 2 is a block diagram of a system for manufacturing such a three layer tissue, generally designated by reference number 100, according to an exemplary embodiment of the present invention.
  • the system 100 includes a first exterior layer fan pump 102, a core layer fan pump 104, a second exterior layer fan pump 106, a headbox 108, a forming section 110, a drying section 112 and a calender section 114.
  • the first and second exterior layer fan pumps 102, 106 deliver the pulp mixes of the first and second external layers 2, 4 to the headbox 108
  • the core layer fan pump 104 delivers the pulp mix of the core layer 3 to the headbox 108.
  • the headbox delivers a wet web of pulp onto a forming wire within the forming section 110. The wet web is then laid on the forming wire with the core layer 3 disposed between the first and second external layers 2, 4.
  • the partially dewatered web is transferred to the drying section 112.
  • the tissue may be dried using through air drying processes which involve the use of a structured fabric.
  • the tissue is dried to a humidity of about 7 to 20% using a through air drier manufactured by Valmet Corporation, of Espoo, Finland.
  • a through air drier manufactured by Valmet Corporation, of Espoo, Finland.
  • two or more through air drying stages are used in series.
  • this is only one of various methods of manufacturing an absorbent tissue product to be used in manufacturing the laminate of the present invention.
  • the tissue of the present invention is patterned during the through air drying process.
  • Such patterning can be achieved through the use of a TAD fabric, such as a G-weave (Prolux 003) or M-weave (Prolux 005) TAD fabric.
  • the tissue of the present invention may be further dried in a second phase using a Yankee drying drum.
  • a creping adhesive is applied to the drum prior to the tissue contacting the drum.
  • a creping blade is then used to remove the tissue from the Yankee drying drum.
  • the tissue may then be calendered in a subsequent stage within the calendar section 114.
  • calendaring may be accomplished using a number of calendar rolls (not shown) that deliver a calendering pressure in the range of 0-100 pounds per linear inch (PLI). In general, increased calendering pressure is associated with reduced caliper and a smoother tissue surface.
  • PLI pounds per linear inch
  • a ceramic coated creping blade is used to remove the tissue from the Yankee drying drum.
  • Ceramic coated creping blades result in reduced adhesive build up and aid in achieving higher run speeds. Without being bound by theory, it is believed that the ceramic coating of the creping blades provides a less adhesive surface than metal creping blades and is more resistant to edge wear that can lead to localized spots of adhesive accumulation.
  • the ceramic creping blades allow for a greater amount of creping adhesive to be used which in turn provides improved sheet integrity and faster run speeds.
  • the tissue of the present invention may also be treated with topical or surface deposited additives.
  • surface deposited additives include softeners for increasing fiber softness and skin lotions.
  • topical softeners include but are not limited to quaternary ammonium compounds, including, but not limited to, the dialkyldimethylammonium salts (e.g. ditallowdimethylammonium chloride, ditallowdimethylammonium methyl sulfate, di(hydrogenated tallow)dimethyl ammonium chloride, etc.).
  • Another class of chemical softening agents include the well-known organo- reactive polydimethyl siloxane ingredients, including amino functional polydimethyl siloxane. zinc stearate, aluminum stearate, sodium stearate, calcium stearate, magnesium stearate, spermaceti, and steryl oil.
  • the adhesive mixture is water soluble and includes a mixture of one or more adhesives, one or more water soluble cationic resins and water.
  • the one or more adhesives are present in an amount of 1% to 10% by weight and may be polyvinyl alcohol, polyvinyl acetate, starch based resins and/or mixtures thereof.
  • a water soluble cationic resin may be present in an amount of up to 10% by weight and may include polyamide-epichlorohydrin resins, glyoxalated polyacrylamide resins, polyethyleneimine resins, polyethylenimine resins, and/or mixtures thereof. The remainder of the mixture is composed of water.
  • FIG. 3 shows an apparatus for manufacturing a laminate of two plies of a structured paper towel or tissue that are joined to each other, in a face-to-face relationship, in accordance with an exemplary embodiment of the present invention.
  • two webs 200, 201 of single ply tissue which may be manufactured, for example, according to a method described above, are fed to respective pairs of mated pressure rolls 203, 205 and substantially axially parallel embossing rolls 204, 206.
  • a first web 200 is thus fed through a nip 202a formed by pressure roll 203 and embossing roll 204 (also known as a pattern roll) and a second web 201 is likewise fed through a nip 202b between pressure roll 205 and embossing roll 206.
  • the embossing rolls 204, 206 which rotate in the illustrated directions, impress an embossment pattern onto the webs as they pass through nip 202a and 202b.
  • each ply may have a plurality of embossments protruding outwardly from the plane of the ply towards the adjacent ply.
  • the adjacent ply likewise may have opposing protuberances protruding towards the first ply. If a three ply product is produced by adding a third pair of mated pressure and embossing rolls, the central ply may have embossments extending outwardly in both directions.
  • the embossing rolls 204, 206 have embossing tips or embossing knobs that extend radially outward from the rolls to make the embossments.
  • embossing is performed by nested embossing in which the crests of the embossing knobs on one embossing roll intermesh with the embossing knobs on the opposing embossing roll and a nip is formed between the embossing rolls.
  • a pattern is produced on the surface of the web by the interconnectivity of the knobs on an embossing roll with the open spaces of the respective pressure roll.
  • An adhesive applicator roll 212 is positioned upstream of the nip 213 formed between the two embossing rolls and is aligned in an axially parallel arrangement with one of the two embossing rolls to form a nip therewith.
  • the heated adhesive is fed from an adhesive tank 207 via a conduit 210 to applicator roll 212.
  • the applicator roll 212 transfers heated adhesive to an interior side of embossed ply 200 to adhere the at least two plies 200, 201 together, wherein the interior side is the side of ply 200 that comes into a face-to-face relationship with ply 201 for lamination.
  • the adhesive is applied to the ply at the crests of the embossing knobs 205 on embossing roll 204.
  • the adhesive is heated and maintained at a desired temperature utilizing, in embodiments, an adhesive tank 207, which is an insulated stainless steel tank that may have heating elements 208 that are substantially uniformly distributed throughout the interior heating surface. In this manner, a large amount of surface area may be heated relatively uniformly.
  • an adjustable thermostat may be used to control the temperature of the adhesive tank 207. It has been found advantageous to maintain the temperature of the adhesive at between approximately 32 degrees C (90 degrees F) to 66 degrees C (150 degrees F), and preferably to around 49 degrees C (120 degrees F).
  • the tank has an agitator 209 to ensure proper mixing and heat transfer.
  • the webs are then fed through the nip 213 where the embossing patterns on each embossing roll 204, 206 mesh with one another.
  • a marrying roll 214 is used to apply pressure for lamination.
  • the marrying roll 214 forms a nip with the same embossing roll 204 that forms the nip with the adhesive applicator roll 212, downstream of the nip formed between the two embossing rolls 204, 206.
  • the marrying roll 214 is generally needed because the crests of the nested embossing knobs 205 typically do not touch the perimeter of the opposing roll 206 at the nip 213 formed therebetween.
  • the specific pattern that is embossed on the absorbent products is significant for achieving the enhanced scrubbing resistance of the present invention.
  • the embossed area on any ply should cover between approximately 5 to 15% of the surface area.
  • the size of each embossment should be between approximately 0.04 to 0.08 square centimeters.
  • the depth of the embossment should be within the range of between approximately 0.28 and 0.43 centimeters (0.110 and 0.170 inches) in depth.
  • the settings will include the use of the lower magnification camera ("Low Mag Cam") set at a magnification of 12x.
  • the magnification utilized to obtain the measurements and data reported were obtained at 38x magnification. After an area with no embossment is centered in the viewer, the magnification is increased to 38x.
  • This image can be altered to include the light image and the height measurement image by using the texture slide.
  • Images will appear showing the optical version of the image, the height version of the image (an image using color to show topography), and a 3D image. 15. Go to the "Measurement” tab at the top of the screen and select "Volume & Area
  • a new screen will appear containing a large optical image and a topographical scale on the bottom and the right sides of the screen depicting the topography of the cursor lines on the screen (see screen shot shown in FIG. 4).
  • the black topographical areas on the right side and under the image, have 2 lines located in them and act as the upper limit and the lower limit for measurement. These lines are moved manually to establish the area to be measured. The upper limits and lower limits are set so the pocket is completely filled.
  • the upper limit is positioned by maximizing the "Surface Area" in a selected pocket.
  • the borders for the pocket are the raised areas of the tissue or towel created by the TAD fabric.
  • the upper limit is determined when the surface area is at its greatest value without "spilling over" into another pocket.
  • the lower limit is then adjusted the same way.
  • the lower limit is raised until the surface area reaches a maximum value on the screen and in the numerical read out located on the left of the screen, without "spilling over" into another pocket.
  • the software provides the values for the volume of the pocket and the average depth of the pocket. Other measurements such as maximum depth are also supplied.
  • steps 17 through 20 are repeated for a number of pockets (e.g., 18 to 20 pockets) so that an average pocket volume and average pocket surface area can be obtained for the area.
  • TSA Tissue Softness Analyzer
  • BALL BURST TESTING Ball Burst of a 2-ply tissue web was determined using a Tissue Softness Analyzer (TS A), available from EMTECH Electronic GmbH of Leipzig, Germany using a ball burst head and holder. A punch was used to cut out five 100 cm 2 round samples from the web. One of the samples was loaded into the TSA, with the embossed surface facing down, over the holder and held into place using the ring. The ball burst algorithm was selected from the list of available softness testing algorithms displayed by the TSA. The ball burst head was then pushed by the EMTECH through the sample until the web ruptured and the grams force required for the rupture to occur was calculated. The test process was repeated for the remaining samples and the results for all the samples were averaged.
  • TS A Tissue Softness Analyzer
  • An Instron 3343 tensile tester manufactured by Instron of Norwood, MA, with a 100N load cell and 25.4 mm rubber coated jaw faces was used for tensile strength measurement. Prior to measurement, the Instron 3343 tensile tester was calibrated. After calibration, 8 strips of 2-ply product, each one inch by four inches, were provided as samples for each test. For testing MD tensile strength, the strips are cut in the MD direction and for testing CD tensile strength the strips are cute in the CD direction. One of the sample strips was placed in between the upper jaw faces and clamp, and then between the lower jaw faces and clamp with a gap of 2 inches between the clamps. A test was run on the sample strip to obtain tensile and stretch.
  • the test procedure was repeated until all the samples were tested.
  • the values obtained for the eight sample strips were averaged to determine the tensile strength of the tissue.
  • the strips are placed in an oven at 105 deg Celsius for 5 minutes and saturated with 75 microliters of deionized water immediately prior to pulling the sample.
  • BASIS WEIGHT [0001] Using a dye and press, six 76.2mm by 76.2mm square samples were cut from a 2-ply product being careful to avoid any web perforations. The samples were placed in an oven at 105 deg C for 5 minutes before being weighed on an analytical balance to the fourth decimal point. The weight of the sample in grams is divided by (0.0762m) 2 to determine the basis weight in grams/m 2 .
  • Thwing- Albert ProGage 100 Thickness Tester manufactured by Thwing Albert of West Berlin, NJ, USA, was used for the caliper test. Eight 100mm x 100mm square samples were cut from a 2-ply product. The samples were then tested individually and the results were averaged to obtain a caliper result for the base sheet.
  • Example #1 Paper towel made on a wet-laid asset with a three layer headbox was produced using the through air dried method. At 5% speed differential the web was transferred from the inner wire to the TAD fabric.
  • the flow to each layer of the headbox was about 33% of the total sheet.
  • the three layers of the finished tissue from top to bottom were labeled as air, core and dry.
  • the air layer is the outer layer that is placed on the TAD fabric
  • the dry layer is the outer layer that is closest to the surface of the Yankee dryer and the core is the center section of the tissue.
  • the tissue was produced with 20% eucalyptus, 15% Cannabis bast fiber, and 65% northern bleached softwood kraft (NBSK) fibers.
  • the Yankee layer fiber was 50% eucalyptus, 50% BSK.
  • Polyamine polyamide-epichlorohydrin resin at lOkg/ton (dry basis) and 4 kg/ton (dry basis) of carboxymethyl cellulose was added to each of the three layers to generate permanent wet strength.
  • the towel was then plied together using a nested embossing process in which a heated adhesive is applied with an applicator roll to an embossing roll to create a rolled 2-ply product with 142 sheets, a roll diameter of 142mm, with sheets a length of 6.0 inches and width of 11 inches.
  • the 2-ply tissue product further had the following product attributes: Basis Weight 39 g/m 2 , Caliper 0.850 mm, MD tensile of 385 N/m, CD tensile of 365 N/m, a ball burst of 820 grams force, an MD stretch of 18%, a CD stretch of 6%, a CD wet tensile of 105 N/m, an absorbency of 750 gsm and a Wet Scrubbing resistance of 130 revolutions and a 53 TSA softness.
  • Table 1 shows a comparison of average pocket volumes of the 2-ply paper towel product of Example 1 versus competitor products.
  • the inventive 2-ply paper towel product provides an outer surface with higher pocket volume as compared to competitor products except for the Bounty product.
  • the higher pocket volume in turn provides higher Z-direction thickness and unique surface topography, both of which contribute to an overall higher softness of the paper towel product.
  • the inventive paper towel product exhibits an outer surface with higher pocket surface area compared to competitor products.
  • Structuring fabrics used to form paper webs may be woven structures that utilize monofilaments (strands, yarns, threads) composed of synthetic polymers (usually polyethylene terephthalate, polyethylene, polypropylene, or nylon).
  • the structuring fabric has two surfaces: the sheet side and the machine or wear side.
  • the wear side is in contact with the elements that support and move the fabric and are thus prone to wear.
  • the sheet side is in contact with the fibrous web and typically uses vacuum or a low intensity pressing to draw the web into the fabric and impart the pattern of the monofilaments into the web.
  • the conventional manufacturing of woven structuring fabrics includes the following operations: weaving, initial heat setting, seaming, final heat setting, and finishing.
  • the fabric is made in a loom using two interlacing sets of monofilaments (or threads, yarns, or strands).
  • the longitudinal threads are called warp threads and the transverse threads are called weft threads.
  • the warp threads run in the machine direction (MD) of the paper-machine, while the weft threads run in the cross machine direction (CD) of the paper machine.
  • MD machine direction
  • CD cross machine direction
  • the next step in manufacturing is seaming. This step converts the flat woven fabric into an endless fabric by joining the two machine direction ends of the fabric.
  • the final heat setting is applied to stabilize and relieve the stresses in the seam area.
  • the final step in the manufacturing process is finishing, where the fabric is cut to width and sealed.
  • weave patterns There are many types of weave patterns, but the three most fundamental types of weave patterns are plain weave, satin weave, and twill weave. As shown in FIG. 5, in a plain weave the warp and weft are aligned so they form a simple criss-cross pattern. Each weft thread crosses the warp threads by going over one, then under the next, and so on. The next weft thread goes under the warp threads that its neighbor went over, and vice versa. As shown in FIG. 6, in a satin weave the weft floats over four or more warp strands or vice versa before repeating the pattern. As shown in FIG.
  • FIG. 7A in a twill weave a pattern of diagonal parallel ribs is developed by passing the weft thread over one or more warp threads then under two or more warp threads and so on with a "step" or offset between rows to create the characteristic diagonal pattern.
  • a left handed twill can be seen in FIG. 7B where the diagonal pattern flows from the upper left to the lower bottom.
  • FIG. 7C A right handed twill can be seen in FIG. 7C where the pattern flows from lower left to the upper right.
  • FIG. 8 shows a structuring fabric according to an exemplary embodiment of the present invention with a herringbone twill weave pattern that incorporates both a left and a right handed twill by periodically reversing the twill, thereby forming a distinctive V-shaped weaving pattern.
  • the twill pattern may reverse itself every 2 inches to 12 inches, more preferably every 2 to 6 inches, and most preferably every 2 to 4 inches.
  • the structuring fabric with reversing left handed and right handed twill may be used to form any disposable tissue, towel, facial tissue, or wipe with a distinctive V-shaped pattern.
  • the structuring fabric may be used in any papermaking process that uses structuring fabrics such as through air drying (TAD), Un-creped Through Air Drying, ETAD, and ATMOS process.
  • TAD through air drying
  • ETAD Un-creped Through Air Drying
  • ATMOS ATMOS

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Sanitary Thin Papers (AREA)

Abstract

L'invention concerne un produit de mouchoir ou de serviette en papier jetable qui comprend au moins deux plis, une surface externe exposée d'au moins l'un des deux plis comprenant une pluralité de poches, la pluralité de poches ayant un volume moyen supérieur à 0,4 mm3 et une surface spécifique moyenne de 2,5 mm2, le produit étant formé à l'aide d'un tissu structuré ayant des motifs croisés droite et gauche qui s'inversent périodiquement.
PCT/US2018/029905 2017-04-27 2018-04-27 Serviette jetable produite avec des creux de surface de grand volume WO2018201021A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA3060671A CA3060671A1 (fr) 2017-04-27 2018-04-27 Serviette jetable produite avec des creux de surface de grand volume
MX2019012814A MX2019012814A (es) 2017-04-27 2018-04-27 Toalla desechable producida con depresiones superficiales de gran volumen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/499,513 US10538882B2 (en) 2015-10-13 2017-04-27 Disposable towel produced with large volume surface depressions
US15/499,513 2017-04-27

Publications (1)

Publication Number Publication Date
WO2018201021A1 true WO2018201021A1 (fr) 2018-11-01

Family

ID=63919267

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/029905 WO2018201021A1 (fr) 2017-04-27 2018-04-27 Serviette jetable produite avec des creux de surface de grand volume

Country Status (3)

Country Link
CA (1) CA3060671A1 (fr)
MX (1) MX2019012814A (fr)
WO (1) WO2018201021A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030015248A1 (en) * 2001-06-22 2003-01-23 Senri Itoh Single layer textile for manufacturing construction material
US20080314535A1 (en) * 2006-07-11 2008-12-25 The Procter & Gamble Company Embossed multi-ply tissue having a softening lotion

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030015248A1 (en) * 2001-06-22 2003-01-23 Senri Itoh Single layer textile for manufacturing construction material
US20080314535A1 (en) * 2006-07-11 2008-12-25 The Procter & Gamble Company Embossed multi-ply tissue having a softening lotion

Also Published As

Publication number Publication date
MX2019012814A (es) 2022-11-07
CA3060671A1 (fr) 2018-11-01

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