US3880368A - Pulp refiner element - Google Patents

Pulp refiner element Download PDF

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Publication number
US3880368A
US3880368A US340027A US34002773A US3880368A US 3880368 A US3880368 A US 3880368A US 340027 A US340027 A US 340027A US 34002773 A US34002773 A US 34002773A US 3880368 A US3880368 A US 3880368A
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United States
Prior art keywords
refiner
fiber
refining element
set forth
psi
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.)
Expired - Lifetime
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US340027A
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English (en)
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John B Matthew
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beloit Corp
Original Assignee
Beloit Corp
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Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Priority to US340027A priority Critical patent/US3880368A/en
Priority to JP49021546A priority patent/JPS49117701A/ja
Priority to IN415/CAL/1974A priority patent/IN140480B/en
Priority to FI589/74A priority patent/FI60043B/fi
Priority to SE7403105A priority patent/SE407950B/sv
Priority to GB1062674A priority patent/GB1456421A/en
Priority to FR7409350A priority patent/FR2221576B1/fr
Priority to CA194,790A priority patent/CA995943A/en
Priority to DE2411712A priority patent/DE2411712A1/de
Priority to ES424187A priority patent/ES424187A1/es
Priority to AR252735A priority patent/AR203100A1/es
Priority to BR1866/74A priority patent/BR7401866D0/pt
Priority to IT20823/74A priority patent/IT1007750B/it
Application granted granted Critical
Publication of US3880368A publication Critical patent/US3880368A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/30—Rubber elements in mills

Definitions

  • ABSTRACT A refining element for a pulp stock refiner having at least its working edges composed of a relatively soft (e.g. nylon), less stiff material, as compared to ferrous metals, whereby fibers of pulp refined in a refiner having such elements are fibrillated and made flexible and have less tendency to be cut into shorter lengths, as compared to pulp fiber refined with ferrous metal elements, as the stock is processed through the refiner.
  • a relatively soft e.g. nylon
  • fibers of pulp refined in a refiner having such elements are fibrillated and made flexible and have less tendency to be cut into shorter lengths, as compared to pulp fiber refined with ferrous metal elements, as the stock is processed through the refiner.
  • FIG. 2A 16 Claims, 14 Drawing Figures PATENTEBAFRZSIHTS PER-CENT PASSING THRU I00 MESH SHEET 20F 7 Nl-HARD NYLON C.S.F. ml FIG. 2A
  • This invention relates to refiners which prepare paper pulp fibers to the desired condition prior to their being delivered to the papermaking machine. More particularly, this invention relates to the fiber contacting blades or disks within the refiners which actually modify the pulp stock fibers to the desired condition.
  • the structural network that makes up a paper sheet is comprised essentially of cellulose fibers which are randomly distributed and connected to one another by virtue of bonds between hydroxyl groups which are formed when the water is removed from the sheet.
  • the strength characteristics of the resulting sheet are dependent on the extent of the bonding and the strength of the fibers that make up the sheet.
  • the pulp stock consists essentially of individual fibers. These fibers are relatively slender tube-like structural elements made up of a number of concentric layers. Each of these layers (called lamellae) consists of finer structural elements (called fibrils) which are helically wound and bonded to one another to form the cylindrical lamellae.
  • the lamellae are in turn bonded to one another thus forming a composite which in accordance with the laws of mechanics has distinct bending and torsional rigidity.
  • a relatively hard outer sheath (called the primary wall) encases the fiber.
  • the primary wall is often partially removed during the pulping process. The relative stiffness of the fiber, the relative low surface area, and the presence of the primary wall all inhibit bond formation and subsequently limit the strength of the paper formed from these fibers.
  • Fiber must also be made more flexible, so that during sheet formation the fibers conform to and around one another producing large areas of intimate contact. This increase in flexibility is accomplished by a rapid and frequent flexure of the fiber until the bonds between the concentric lamellae are broken down (delaminated), the result being equivalent to the delamination of a beam.
  • intensity is a comparative term relating the power required to operate the refiner, considering the speed and pressure forcing the refiner blade elements together, with the relative percent of fibers in a distribution curve which meet certain standards, such as fiber length. The result is that while some fibers might be treated with precisely the required intensity, many are treated insufficiently, and many are treated at an intensity level so high as to cut or otherwise damage the fibers.
  • thermoplastics made from certain synthetic resins fall into the appropriate range of moduli of elasticity and at the same time fulfill the requirements of strength, impact resistance, abrasion resistance, and hydrolytic stability that would be expected in a pulp refiner at normal operating temperatures. Elements made of such materials fibrillate and delaminate the fibers without tending to cut them lengthwise into segments.
  • these materials are relatively soft, having modulii of elasticity of between about 0.l X 10 psi to about 2.0 X psi. They also must exhibit sufficient resistance to abrasion and creep at their operating temperature within the refiner.
  • Another object of the invention is to use, for at least the pulp contacting edge of the blade element, a material which has a modulus of elasticity between about 0.] X psi to about 2.0 X 10 psi, which operates in a refiner below its temperature at which creep occurs.
  • Another object of this invention is to provide a nonferrous blade element for a paper pulp refiner which fibrillates pulp fibers without reducing the average fiber length as compared to fibers refined with steel blade elements.
  • Still another object of the invention is to provide a thermoplastic refiner blade element which is hydrolytically stable and abrasion resistant.
  • Yet another object of the invention is to provide a refiner blade element having such physical properties as to produce pulp fibers to make paper having improved strength properties.
  • a feature of this invention is a refiner blade material which can be molded into shape.
  • Another feature of the invention is that a refiner can be constructed without any metallic blade elements for use in industries where any metal in the refined pulp is extremely undesirable.
  • FIG. I is a face view of a disk for a disk refiner on which a plurality of individual blade elements are formed.
  • FIGS. 20 and 2b are curves comparing the fiber length of a pulp refined using nickel steel blade elements with the fiber length of a pulp refined using nylon blade elements.
  • FIGS. 3a3e are curves comparing the properties of paper made from a pulp refined using nickel steel with those of paper made from a pulp refined using nylon blade elements.
  • FIG. 4 is a top view of a beater type refiner.
  • FIG. 5 is a side elevational view in section of the beater shown in FIG. 4.
  • FIG. 6 is a side elevational view, partially in section, of a disk type refiner.
  • FIG. 7 is a side elevational view, partially in section, of a conical type refiner shell.
  • FIG. 8 is an end view of the conical shaped inner wall of the refiner shown in FIG. 7 and showing the blade elements therein.
  • FIG. 9 is a perspective view of a conical refiner assembly.
  • the material to be used for refiner blade elements in addition to having the appropriate modulus of elasticity (stiffness), must possess certain physical properties in order to economically replace a metallic element in a commercial installation.
  • the broad requirements are (l) hydrolytic resistance.
  • Ultra high molecular weight polyethylene while exhibiting superb abrasion resistance and hydrolytic stability, has proven unsatisfactory in pure matrix form due to a lack of creep resistance, particularly at temperatures above about 70 F. Creep resistance of ultra-high molecular weight polyethylene is improved to a satisfactory level when it is combined with a fiber material, such as type 610 or type 6 l 2 nylon. in addition, due to its relatively low modulus of elasticity, 0.14 X 10 psi, it is less efficient in refining than the harder thermoplastics. Similarly, modified phenylene oxide sold under the tradename Noryl (reg.
  • thermoplastics such as modified phenylene oxide, can be made sufficiently abrasion resistant by treatment with a fiurocarbon compound.
  • nylon although processing no outstanding properties, generally exhibits sufficiently high properties in all respects to provide acceptable performance for continuous use.
  • Nylon types 610 and 612 have been found to be especially suitable. In order to provide sufficient hydrolytic stability, type 612 nylon was used for the blade material of the elements used in the tests from which the data of H08. 2a, 2b and 3a-3e was obtained. At least one nylon, type 66, is hydrolytically unstable and, therefore, unsuitable for this type of use. Fiberglas reinforcement was added to the resin to provide improved creep resistance and heat resistance. Long term tests have indicated that the useful life of the nylon disks is approximately the same as the expected life of a nickel steel disk, although somewhat less than that of a milled stainless steel disk.
  • acetal homopolymers polyarylsulfones, polysulfones, and polyphenylene sulfides.
  • Reinforcing fibers such as glass, may be added to any of these to enhance creep resistance (this is especially effective as temperatures increase), and they may be compounded with flurocarbons (Telfon which is a registered trademark for tetrafluoroethylene (TFE) fluorocarbon resin, for example) to reduce friction and decrease the wear rate (increase abrasion resistance).
  • TFE tetrafluoroethylene
  • thermoplastic polyester or a glass reinforced polypropylene might also be used.
  • Plastics are particularly desirable because they are usually easily molded, extruded and machined, thus lowering manufacturing costs
  • modified phenylene oxide sold under the tradename Noryl (reg. TM) and the type of nylons sold under the tradename Zytel (reg. TM) have been successfully molded into disk type blade elements.
  • Disk elements can be molded, cast or machined, while blade elements (for conical or beater type refiners) can be extruded and/0r machined.
  • some plastic materials having particular physical properties, are capable of performing quite well when used to make refiner disks or blades.
  • the suitability of a material for use as refiner blade elements is not a function solely of its hardness or stiffness (as measured by its modulus of elasticity). it is a function of a combination of these parameters which in turn may be affected by creep and heat and abrasion resistance. More specifically, the creep limit of the material is significant and this is defined as the maximum tensile stress which can be applied to the material at a given temperature without resulting in measurable creep. Therefore, the operating temperature within the refiner becomes important.
  • this operating temperature might range from about 50 F. to about 2l0 F. If the temperature at which creep occurs is within the range of refiner operating temperatures, a particular material may not work in that type of refiner or at a particular intensity, although it may be perfectly satisfactory in another type of refiner having lower operating temperatures.
  • Tables I through lll which tabulate the test results of disks made of Zytel (Reg. TM) and NiHard (nickel alloy) steel.
  • the graphs in FIGS. 20, 2b and 3a-3e were made from some of the data in these tables.
  • BDT/D means bone dry tons per day
  • BHPD/BDT means brake horsepower per bone dry ton per day
  • C.S. freeness means Canadian Standard freeness which is a measure of the rate with which water drains from a stock suspension through a wire mesh screen or a perforated plate
  • bulk means the apparent specific volume of a sheet of paper when in a pile under a specified pressure
  • burst factor is a numerical value obtained by dividing the bursting strength in grams per square centimeter by the basis weight of the sheet in grams per square meter
  • plastics having a modulus of elasticity between about 0.1 X 10 psi and about 2.0 X 10 psi, preferably between about 0.2 X 10 psi and about 1.2 X 10' psi, with a creep limit temperature (the maximum temperature at which creep will not occur) above the refiner operating temperature will provide an excellent percentage of properly modified individual pulp fibers per unit of refined pulp when used as the material comprising the blade elements in a refiner.
  • Ceramic materials including glass, tile, concrete and brick, and wood which have modulii of elasticity falling within a 1.0 X 10 psi 10 X 10 psi range, which slightly overlaps the above range for acceptable plastic materials, either do not work nearly as well or not at all; no rubber compounds or rubber-soft materials, such as polyurethane elastomers, work satisfactorily as blade elements in modern refiners for a commercially competitive period of time, and none of these materials is intended to be included within the category of claimed materials.
  • steel and other materials having modulii of elasticity above the level of about 10 X 10 psi do perform successfully in that the pulp stock is refined sufficiently to be saleable but, as the tests have shown, stock refined using disks having physical properties set forth above will be of superior quality.
  • the steel disks also have the disadvantages of higher manufacturing costs and maintenance as aforementioned.
  • the materials which will provide the de sired pulp fiber quality and meet the objectives set forth have a modulus of elasticity of between about 0.1 X 10 psi to about 2.0 X l psi, preferably between about 0.2 X l0 psi to about l.2 X l0 psi. They do not include rubbers, polyurethane elastomers, ceramic materials including glass, tile, concrete and brick, and wood. They must be hydrolytically stable, abrasion resistant, or capable of being made sufficiently abrasion resistant, and able to operate without deforming at the temperatures encountered in the particular type of refiner they are used in.
  • the preferred embodiment material is preferably plastic, ideally a thermoplastic, but not a thermosetting plastic.
  • a plastic refiner disk 10 is illustrated on which a plurality of grooves 12 are cut at an angle 14 with an imaginary line extending radially from the center axis of rotation 16.
  • Grooves l2 define a plurality of blades 18 which fibrillate and refine the stock as it passes radially outwardly between two such refiner disks in refiner such as shown and described in U.S. Pat. Nos. 2,968,444; 3,l 18,622 and 3,323,732, all owned by the assignee of this application.
  • the disks are attached to the refiner by cap screws through holes 20.
  • FIG. 4 a substantially cylindrical shaped beater 30 is shown rotatably mounted in a tank 32.
  • the individual blade elements 10a also shown in FIG. 5, are shaped like a rectangular prism and extend radially from the axis of rotation 36 of beater 30. Stock travels in a continuous path about the tank and is refined as it passes between the beater blades 10a and the similarly constructed blades 10b mounted in the tank.
  • FIG. 6 illustrates the type of refiner 40 in which the disk 10 shown in FIG. 1 would typically be mounted.
  • the stock travels inwardly axially at 42 and is refined between disks 10, 10' as it travels radially outwardly to outlet 44.
  • the blade elements 10d shown in the conical beater wall 51 in FlGS. 7 and 8, are in a spiral configuration, but they can also extend in a straight line in a plane coextensive with the beater's axis of rotation 52 as the blade elements We shown on rotor plug 50 in FIG. 9.
  • Stock travels axially along the periphery of the conical beater plug 50 where it is subjected to varying degrees of refining intensity between the blade elements 106 on rotating plug 50 and blades 10d mounted on the inner conical wall 51 of the beater as it travels from the small end to the larger diamter end.
  • refiner materials described can also be used with corresponding results when made into, or formed upon, the blade elements for conical and beater type refiners.
  • pulp contacting portions of refiner disk could be made of, or coated with, plastic to lower costs of manufacture and replacement.
  • a more rigid material, such as steel or cast iron, could provide the support for the plastic covering on a plastic coated blade element.
  • An abrasion resistant, hydrolytically stable fiber refining element for use in a pulp refiner having at least its fiber contacting surfaces comprising a thermoplastic having a modulus of elasticity between about 0.1 X 10 psi to about 2.0 X 10 psi and having a creep limit temperature above the operating temperature within the refiner.
  • the refining element comprises a disk for use in a disk type refiner.
  • the refining element comprises a blade for use in a conical refiner.
  • the refining element comprises a blade for use in a beater type refiner.
  • the material comprises an acetal hompolymer.
  • the material comprises a polyarylsulfone.
  • the material comprises a polysulfone.
  • the material comprises a polyphenylene sulfide.
  • the material is a pure matrix thermoplastic.
  • the modulus of elasticity is between about 0.2 X 10 psi to about l.2 X 10' psi.
  • the material is Type 612 nylon.
  • the material is Type 610 nylon.
  • the material is treated with a flurocarbon compound to increase its abrasion resistance.
  • the creep limit temperature of the composite material being above the operating temperature within the refiner.
  • the material is ultra high molecular weight polyethylene.

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US340027A 1973-03-12 1973-03-12 Pulp refiner element Expired - Lifetime US3880368A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US340027A US3880368A (en) 1973-03-12 1973-03-12 Pulp refiner element
JP49021546A JPS49117701A (it) 1973-03-12 1974-02-25
IN415/CAL/1974A IN140480B (it) 1973-03-12 1974-02-27
FI589/74A FI60043B (fi) 1973-03-12 1974-02-28 Malningselement foer pappersmassaraffinoer
GB1062674A GB1456421A (en) 1973-03-12 1974-03-08 Pulp refiner element
SE7403105A SE407950B (sv) 1973-03-12 1974-03-08 Fiberraffinerande element
FR7409350A FR2221576B1 (it) 1973-03-12 1974-03-12
CA194,790A CA995943A (en) 1973-03-12 1974-03-12 Pulp refiner element
DE2411712A DE2411712A1 (de) 1973-03-12 1974-03-12 Fein-element fuer eine feinmuehle zum feinen von faserstoff-papierbrei
ES424187A ES424187A1 (es) 1973-03-12 1974-03-12 Perfeccionamientos en la construccion de elementos de refi-nacion para refinadores de fibras.
AR252735A AR203100A1 (es) 1973-03-12 1974-03-12 Elemento de refinacion de fibras para utilizar en un refinador de pasta de papel y similares como disco, cuchilla y cono
BR1866/74A BR7401866D0 (pt) 1973-03-12 1974-03-12 Elemento para refinacao de fibra
IT20823/74A IT1007750B (it) 1973-03-12 1974-04-08 Elemento di raffinatore per paste per la fabbricazione di carta

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US340027A US3880368A (en) 1973-03-12 1973-03-12 Pulp refiner element

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US3880368A true US3880368A (en) 1975-04-29

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US340027A Expired - Lifetime US3880368A (en) 1973-03-12 1973-03-12 Pulp refiner element

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US (1) US3880368A (it)
JP (1) JPS49117701A (it)
AR (1) AR203100A1 (it)
BR (1) BR7401866D0 (it)
CA (1) CA995943A (it)
DE (1) DE2411712A1 (it)
ES (1) ES424187A1 (it)
FI (1) FI60043B (it)
FR (1) FR2221576B1 (it)
GB (1) GB1456421A (it)
IN (1) IN140480B (it)
IT (1) IT1007750B (it)
SE (1) SE407950B (it)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5425508A (en) * 1994-02-17 1995-06-20 Beloit Technologies, Inc. High flow, low intensity plate for disc refiner
US5467931A (en) * 1994-02-22 1995-11-21 Beloit Technologies, Inc. Long life refiner disc
US5730371A (en) * 1992-03-31 1998-03-24 Thermo Fibergen Inc. Delumper
US5823453A (en) * 1995-11-14 1998-10-20 J & L Fiber Services, Inc. Refiner disc with curved refiner bars
US5875982A (en) * 1996-08-26 1999-03-02 J & L Fiber Services, Inc. Refiner having center ring with replaceable vanes
US20160184830A1 (en) * 2013-08-05 2016-06-30 Sharp Kabushiki Kaisha Mill and beverage preparation apparatus including the same
WO2018053475A1 (en) * 2016-09-19 2018-03-22 Mercer International Inc. Absorbent paper products having unique physical strength properties
US10463205B2 (en) 2016-07-01 2019-11-05 Mercer International Inc. Process for making tissue or towel products comprising nanofilaments
US10570261B2 (en) 2016-07-01 2020-02-25 Mercer International Inc. Process for making tissue or towel products comprising nanofilaments
CN111350098A (zh) * 2018-12-24 2020-06-30 上海钱丰纺织品有限公司 一种耐化学腐蚀性优异的热稳定性纸材及其制备方法
US10724173B2 (en) 2016-07-01 2020-07-28 Mercer International, Inc. Multi-density tissue towel products comprising high-aspect-ratio cellulose filaments
US11352747B2 (en) 2018-04-12 2022-06-07 Mercer International Inc. Processes for improving high aspect ratio cellulose filament blends

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19955009C2 (de) * 1999-11-16 2001-10-18 Voith Paper Patent Gmbh Verfahren zur Herstellung von Garnituren für das mechanische Bearbeiten von suspendiertem Faserstoffmaterial

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1795603A (en) * 1928-03-08 1931-03-10 Bauer Bros Co Method of producing pulp
US2807989A (en) * 1953-07-09 1957-10-01 Lamort E & M Beater apparatus
US2934278A (en) * 1956-03-14 1960-04-26 Noble & Wood Machine Company Combination jordan and disc refiner for paper stock
US3085369A (en) * 1959-03-03 1963-04-16 Howard J Findley Gear finishing
US3305183A (en) * 1964-06-15 1967-02-21 Morden Machines Company Machine for treating pulp material
US3459379A (en) * 1967-01-18 1969-08-05 Beloit Corp Mechanical pulping apparatus
US3530772A (en) * 1967-02-15 1970-09-29 Nippon Piston Ring Co Ltd Cylinder or cylinder liner and method for producing the same
US3746266A (en) * 1971-10-01 1973-07-17 Gen Signal Corp Waste disintegrator rotor and ring assembly
US3745645A (en) * 1968-04-25 1973-07-17 Voith Gmbh J M Method of manufacture and operation of ribbed member for treatment of fibrous suspensions

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1795603A (en) * 1928-03-08 1931-03-10 Bauer Bros Co Method of producing pulp
US2807989A (en) * 1953-07-09 1957-10-01 Lamort E & M Beater apparatus
US2934278A (en) * 1956-03-14 1960-04-26 Noble & Wood Machine Company Combination jordan and disc refiner for paper stock
US3085369A (en) * 1959-03-03 1963-04-16 Howard J Findley Gear finishing
US3305183A (en) * 1964-06-15 1967-02-21 Morden Machines Company Machine for treating pulp material
US3459379A (en) * 1967-01-18 1969-08-05 Beloit Corp Mechanical pulping apparatus
US3530772A (en) * 1967-02-15 1970-09-29 Nippon Piston Ring Co Ltd Cylinder or cylinder liner and method for producing the same
US3745645A (en) * 1968-04-25 1973-07-17 Voith Gmbh J M Method of manufacture and operation of ribbed member for treatment of fibrous suspensions
US3746266A (en) * 1971-10-01 1973-07-17 Gen Signal Corp Waste disintegrator rotor and ring assembly

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5730371A (en) * 1992-03-31 1998-03-24 Thermo Fibergen Inc. Delumper
US5425508A (en) * 1994-02-17 1995-06-20 Beloit Technologies, Inc. High flow, low intensity plate for disc refiner
US5467931A (en) * 1994-02-22 1995-11-21 Beloit Technologies, Inc. Long life refiner disc
US5823453A (en) * 1995-11-14 1998-10-20 J & L Fiber Services, Inc. Refiner disc with curved refiner bars
US5975438A (en) * 1995-11-14 1999-11-02 J & L Fiber Services Inc. Refiner disc with curved refiner bars
US5875982A (en) * 1996-08-26 1999-03-02 J & L Fiber Services, Inc. Refiner having center ring with replaceable vanes
US10239062B2 (en) * 2013-08-05 2019-03-26 Sharp Kabushiki Kaisha Mill and beverage preparation apparatus including the same
US20160184830A1 (en) * 2013-08-05 2016-06-30 Sharp Kabushiki Kaisha Mill and beverage preparation apparatus including the same
US10463205B2 (en) 2016-07-01 2019-11-05 Mercer International Inc. Process for making tissue or towel products comprising nanofilaments
US10570261B2 (en) 2016-07-01 2020-02-25 Mercer International Inc. Process for making tissue or towel products comprising nanofilaments
US10724173B2 (en) 2016-07-01 2020-07-28 Mercer International, Inc. Multi-density tissue towel products comprising high-aspect-ratio cellulose filaments
WO2018053475A1 (en) * 2016-09-19 2018-03-22 Mercer International Inc. Absorbent paper products having unique physical strength properties
CN110139961A (zh) * 2016-09-19 2019-08-16 美世国际有限公司 具有独特物理强度性质的吸收性纸产品
US10640927B2 (en) 2016-09-19 2020-05-05 Mercer International, Inc. Absorbent paper products having unique physical strength properties
US10640928B2 (en) 2016-09-19 2020-05-05 Mercer International Inc. Absorbent paper products having unique physical strength properties
CN110139961B (zh) * 2016-09-19 2023-01-06 美世国际有限公司 具有独特物理强度性质的吸收性纸产品
US11352747B2 (en) 2018-04-12 2022-06-07 Mercer International Inc. Processes for improving high aspect ratio cellulose filament blends
CN111350098A (zh) * 2018-12-24 2020-06-30 上海钱丰纺织品有限公司 一种耐化学腐蚀性优异的热稳定性纸材及其制备方法

Also Published As

Publication number Publication date
AR203100A1 (es) 1975-08-14
ES424187A1 (es) 1976-06-16
FI60043B (fi) 1981-07-31
FR2221576B1 (it) 1978-01-06
IT1007750B (it) 1976-10-30
GB1456421A (en) 1976-11-24
IN140480B (it) 1976-11-13
JPS49117701A (it) 1974-11-11
BR7401866D0 (pt) 1974-11-19
DE2411712A1 (de) 1974-09-19
SE407950B (sv) 1979-04-30
FR2221576A1 (it) 1974-10-11
CA995943A (en) 1976-08-31

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