WO2001031118A1 - Utilisation de tensioactifs dans une section presse de machine a papier permettant d'ameliorer l'elimination de l'eau - Google Patents

Utilisation de tensioactifs dans une section presse de machine a papier permettant d'ameliorer l'elimination de l'eau Download PDF

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Publication number
WO2001031118A1
WO2001031118A1 PCT/US2000/029123 US0029123W WO0131118A1 WO 2001031118 A1 WO2001031118 A1 WO 2001031118A1 US 0029123 W US0029123 W US 0029123W WO 0131118 A1 WO0131118 A1 WO 0131118A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
press section
web
paper
felt
Prior art date
Application number
PCT/US2000/029123
Other languages
English (en)
Inventor
William Harold Petke
Original Assignee
Geo Specialty Chemicals, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Geo Specialty Chemicals, Inc. filed Critical Geo Specialty Chemicals, Inc.
Publication of WO2001031118A1 publication Critical patent/WO2001031118A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28—Addition before the dryer section, e.g. at the wet end or press section

Definitions

  • the present invention relates to a method for manufacturing paper and paper
  • the present invention relates to a method for
  • paper includes a series of operations and processes.
  • Refining consists of pumping an aqueous pulp slurry through a series of metal
  • a sheet that is formed from unrefined pulp will generally have a low density and be rather soft and weak, whereas if the same pulp is well-refined, the resultant
  • the furnish has a solids concentration, which is referred to as consistency,
  • the furnish is usually fed to a headbox apparatus through one or more screens or
  • the furnish then enters a flow spreader
  • flow spreader discharges the slurry into a headbox where fiber agglomeration is prevented
  • the wire can be moving at a speed of
  • Continuous sheet forming and drying can be
  • a wire-covered cylinder is mounted in a vat containing
  • the wet web is removed at the top of the cylinder, passes through press rolls for water removal, and is then dried over
  • the Fourdrinier machine is more complex than the cylinder machine and basically
  • the fiber slurry which is introduced at one end of the
  • the web is then directed to the press and dryer sections as in the
  • the twin- wire machine is the latest development and consists essentially of two
  • Twin-wire formers have replaced the Fourdrinier, particularly for
  • twin-wire formers the water is drained from the slurry from both the top and bottom of
  • the two wires, with the slurry between, are wrapped around a cylinder or set
  • the pressurized slurry drains through one or
  • the wire is mounted over a breast roll at the intake end
  • wing-shaped elements which support the wire and induce a vacuum at the downstream nip.
  • Foil geometry can be varied to provide optimum conditions.
  • the stock issuing from the slice is a suspension of fibers in water
  • the surface ceases to appear mobile, loses its liquid sheen, and takes on a matte
  • the sheet leaving the wet end has a consistency of 18-23%. Conventionally,
  • Press rolls may be solid or perforated and often suction is also
  • the sheet is passed through each rotary press on
  • the sheet can stand higher and higher pressure as
  • the dryer section usually includes a series of steam-heated cylinders.
  • the efficiency of the drying sequence is dependent upon such factors as the amount of applied pressure which squeezes the wet web between the felts, the efficiency
  • the emerging dry paper product i.e., 92-96%.
  • the fibers are free to slide over one another, but
  • non-polar organic solvents e.g., odorless kerosene
  • water-insoluble liquid hydrocarbons e.g., ISOPAR G, a proprietary aliphatic iso-paraffinic compound
  • consistency of the web can be increased by as much as 10 percent during pressing.
  • volatilized solvents can be separated and recovered from the water vapor leaving the
  • the present invention relates to a method for increasing the rate of water removal
  • the surfactants are not applied to the press section felts to displace or replace or
  • interstitial water in the web is reduced, it can be removed at a greater rate during pressing.
  • the surfactants used in the present invention are
  • FIG. 1 is a schematic illustration of a typical Fourdrinier paper-making machine
  • FIG. 2 is a schematic illustration showing a surfactant according to the method
  • the present invention generally relates to the application of a water-soluble or
  • water is pressed out of the web in order to increase its consistency.
  • the water passes from the web into or through the press felt where it will later be removed by suction.
  • water-dispersible surfactant reduces the interfacial surface tension of any water it comes
  • Use of the present invention may also inhibit the deposition
  • Machine 10 includes a flow spreader 1 1, a
  • headbox 12 a Fourdrinier table 13, a press section 14, a dryer section 15. a calender stack
  • Press section 14 includes a pair of rolls 20 that press paper 22.
  • Contacting paper 22 is a continuous loop of felt 24.
  • Felt 24 is conditioned with a detergent shower 26 and a high pressure shower 28. Of course, care must be taken to
  • suction pipe 34 is located after the lubricating shower 32.
  • a surfactant is applied to the felt 24 at shower 38.
  • the surfactant has an HLB number of
  • HLB number hydrophilic-lipophilic balance
  • L denotes the percentage by weight of the lipophilic group relative to the weight of the lipophilic group
  • Felts generally comprise nylon or some other synthetic fiber. Different surfactants may-
  • Sulfonate-type surfactants are generally not suited for use in the present invention for they tend to lead to excessive foam
  • the surfactants utilized in the present invention must be no or low foaming.
  • the most preferred surfactant is a polyethylene glycol 400, which is
  • alcohol ethoxylates include alcohol ethoxylates; alkylphenol ethoxylates; glycerol esters; polyoxyethylene
  • esters anhydrosorbitol esters; ethoxylated anhydrosorbitol esters; natural ethoxylated
  • the surfactant is a liquid, it can be applied in a substantially pure form directly
  • showering may be employed. It will be appreciated that if the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid, it must be dissolved in water before being applied to the press felt. Preferably, whether the surfactant is a solid,
  • surfactant is a liquid or a solid, it is applied to the press felt as a solution with water by
  • the surfactants may also be advantageously
  • force of pressure can also be used to dispense water from the web.
  • the amount of surfactant utilized is not per se critical to the method of this
  • the felt surfaces must be uniformly and partially wetted by the surfactant for
  • some of the surfactant is available for transfer to the web to assist in the
  • the web has been reduced, it can more easily be removed by pressing in the press section
  • the water-dispersible surfactants used in the invention preferably do not need to
  • the preferred water-dispersible surfactants are biodegradable and can be discharged into conventional water treatment
  • Feltmaster 15-LF surfactant was applied to the felts of a paper machine at a rate
  • Feltmaster 15-LF surfactant was applied to the felts of a paper machine at the rate
  • Moister levels exiting the first press fell from about 69.5% to as low as about 66% over a 5 hour period.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé de fabrication de papier et de produits de papier, impliquant l'utilisation de tensioactifs dans la section presse (14) d'une machine à papier de façon à améliorer l'élimination de l'eau dans une bande. Conformément à ladite invention, on applique au moins un tensioactif sur des feutres (24) de la section presse avant que ceux-ci ne soient en contact avec ladite bande (22). La présence de tensioactifs sur les feutres de la section presse augmente la capacité desdits feutres à éliminer l'eau par réduction de la surface interfaciale de l'eau qui traverse ces feutres. En outre, une partie des tensioactifs appliqués peut être transférée des feutres de la section presse vers la bande, ce qui réduit la tension de surface interfaciale de l'eau restant libre ou de l'eau interstitielle dans ladite bande. Une fois qu'on a réduit la tension de surface interstitielle de l'eau dans la bande, il est beaucoup plus facile d'éliminer l'eau dans les opérations de pressage ultérieures. Ce procédé permet d'augmenter la consistance de la bande pendant le pressage, ce qui entraîne une réduction de l'énergie nécessaire dans la section de séchage de la machine à papier. En conséquence, dans les machines comprenant uniquement un séchoir ou une presse, cette invention permet d'augmenter de la vitesse desdites machine.
PCT/US2000/029123 1999-10-22 2000-10-20 Utilisation de tensioactifs dans une section presse de machine a papier permettant d'ameliorer l'elimination de l'eau WO2001031118A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42622999A 1999-10-22 1999-10-22
US09/426,229 1999-10-22

Publications (1)

Publication Number Publication Date
WO2001031118A1 true WO2001031118A1 (fr) 2001-05-03

Family

ID=23689892

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/029123 WO2001031118A1 (fr) 1999-10-22 2000-10-20 Utilisation de tensioactifs dans une section presse de machine a papier permettant d'ameliorer l'elimination de l'eau

Country Status (1)

Country Link
WO (1) WO2001031118A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184912A (en) * 1976-08-09 1980-01-22 Nalco Chemical Company Pitch control method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184912A (en) * 1976-08-09 1980-01-22 Nalco Chemical Company Pitch control method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"McCutcheon's detergents & emulsifiers", 1975, NORTH AMERICAN EDITION, XP002937800 *
CASEY J.: "Pulp & Paper, chemistry and chemical technology", 1980, JOHN WILEY & SONS, NEW YORK, CHICHESTER, XP002938539 *

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