EP0512819A1 - Verfahren zur Erhöhung des Feststoffgehaltes nach Nasspressoperationen - Google Patents

Verfahren zur Erhöhung des Feststoffgehaltes nach Nasspressoperationen Download PDF

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Publication number
EP0512819A1
EP0512819A1 EP92304095A EP92304095A EP0512819A1 EP 0512819 A1 EP0512819 A1 EP 0512819A1 EP 92304095 A EP92304095 A EP 92304095A EP 92304095 A EP92304095 A EP 92304095A EP 0512819 A1 EP0512819 A1 EP 0512819A1
Authority
EP
European Patent Office
Prior art keywords
surfactant
sheet
water receiver
foam
water
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.)
Withdrawn
Application number
EP92304095A
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English (en)
French (fr)
Inventor
Joseph R. Pounder
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.)
Fort James Corp
Original Assignee
James River Corp of Virginia
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 James River Corp of Virginia filed Critical James River Corp of Virginia
Publication of EP0512819A1 publication Critical patent/EP0512819A1/de
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/002—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by using a foamed suspension
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/004—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by modification of the viscosity of the suspension

Definitions

  • the present invention relates to paper making processes, wherein an increase in sheet solids is achieved after wet pressing operations bY reducing and preferably minimising sheet rewet after wet pressing operations.
  • U.S. Patents 4,606,944 and 4,778,477 there is disclosed the application of foam to a region of a fibrous sheet and the application of a pressure gradient to the sheet in the region where the foam was applied.
  • the processes described in both of these patents preferably employ a vacuum to produce the pressure gradient.
  • U.S. Patent 4,778,477 moreover, is directed to facilitating add-ons, such as dyes and the like. Minimizing rewet in the absence of a vacuum by creating a defined surfactant- or foam-containing region is not disclosed or envisioned in these U.S. patents.
  • the present invention provides a method of reducing, and preferably minimising, sheet rewet after wet pressing, which in turn allows those skilled in the art to also increase the amount of solids in sheets after wet pressing operations.
  • inventive methods herein disclosed contain the steps of (1) forming before or during the pressing together of a wet sheet and a water receiver, a surfactant-laden or foam-filled region at an interface between the sheet and the water receiver, and (2) separating the water receiver from the sheet after the pressing of the two together.
  • Figure 1 Illustrates one currently known method for wet pressing and drying papers, allowing for illustration of certain aspects of the present inventive discovery.
  • the present invention provides for methods of preventing sheet rewet occurring after wet processing operations. This in turn also allows the present invention to provide for sheets having increased solids after wet pressing.
  • the methods disclosed herein are applicable to the production of an endless variety of paper and paper type products, including paper towel and tissue like products, among others.
  • Paper making processes which involve the deposition of aqueous suspensions of paper making fibers on foraminous supports are well known, and moreover, paper making processes which involve the deposition of foamed aqueous suspensions of paper making fibers on foraminous supports are also well known.
  • large volumes of water are utilized to deposit paper making fibers on a suitable support.
  • steps are usually also performed in each type of process to separate the paper making fibers (after deposition) from the aqueous based solutions and foams used to deposit the same.
  • Methods used by those skilled in the art to separate deposited paper making fibers from aqueous based solutions and foams include gravitional means as well as forced means such as phase change, vacuuming, wet pressing, etc.
  • Phase change involves changing water which is present into a vapor
  • vacuuming involves the creation of a pressure differential across layers of paper making fibers so that water is quickly drained therefrom.
  • Wet pressing operations generally entail pressing a sheet of wet paper making fibers against a water receiver so that water in the sheet is transferred from the sheet to the water receiver. Wet pressing operations are most often carried out by using felts as water receivers.
  • Figure 1 Parts of Figure 1 show what may be considered as a typical paper making wet pressing and drying operation, which uses felts as water receivers. Figure 1 at the same time, however, also illustrates many aspects of the present invention.
  • a wet sheet of paper making fibers (1) is carried on a forming fabric belt (3) to a couch roller (9) , which may have a vacuum zone (8) .
  • the vacuum zone of the couch roller operates at about a few inches Hg, and serves to remove water which is present in the fabric belt (3) as well as in the layer of wet fibers thereon, so that the layer of paper making fibers only contains about 75 to 90% water, prior to reaching the pick up zone (7)
  • the wet sheet of fibers is transferred to a felt water receiver (10), and thereafter, the wet fiber sheet can be carried on the felt to an optional first wet pressing station (4) , which contains two press rollers.
  • the first wet pressing station may often contain as a press roller a suction roller, such as (12) with a vacuum zone (14), which operates at about 5 to 10 inches Hg.
  • the use of such a suction roller at wet pressing station (4) helps to ensure that the felt water receiver (11) which the roller contacts, remains relatively dry during wet pressing.
  • wet pressing station (5) contains as one of its pressing rollers a Yankee dryer (27), and as its other pressing roller, a suction roller (13) with a vacuum zone (15).
  • the suction roller (13) operates in similar fashion to the suction roller (12) at wet pressing station (4).
  • the paper sheet adheres to the surface of the dryer (27) and is dried (by phase change of water in the paper sheet to a vapor), and after drying, the paper sheet is removed from the dryer.
  • the paper may be removed from the dryer using a creping blade (34), if desired. In any event, there is obtained a dry paper product (2).
  • a typical wet pressing and drying operation as shown in Figure 1 is continuous and as such, the felt water receivers (10) and (11) used therein must be continually conditioned with respect to moisture content so as to properly work throughout a paper production run.
  • the felt water receivers (10) and (11) used therein must be continually conditioned with respect to moisture content so as to properly work throughout a paper production run.
  • the felts can also be press-rolled to condition their moisture content (6), or wiped to condition their moisture content (26).
  • the felts run around a variety of guide and turn rolls such as (23) and (25), among others.
  • stretch rollers such as (16) and (17) are used to ensure that the felts are continually maintained under proper tension for performing a wet pressing of the paper making fibers used to prepare the dry papers (2).
  • Figure 1 shows what is typical of known wet pressing and drying operations, it is now discussed how Figure 1 additionally illustrates certain aspects of the present invention.
  • the present invention provides for a method of preventing the rewetting of a sheet after a wet pressing of the sheet with a water receiver (such as a felt) by creating a surfactant-laden or foam-filled region at an interface between the sheet and the water receiver, and thereafter, separating the water receiver from the sheet after the wet pressing of the two together.
  • a water receiver such as a felt
  • spray nozzles (29), (30), (31), (32), and (35) are provided as means for applying surfactants or solutions thereof to the wet paper making fibers (1) and/or the felt water receivers (10) and (11).
  • a liquid container reservoir (28) is provided as a means of saturating the felt water receiver (11) with a concentrated solution of a surfactant.
  • any of these means shown in Figure 1 are sufficient for providing a surfactant-laden region at the interface of the paper making fiber sheet (1) and surfaces of felts (10) and (11) that come into contact with (1). It is noted that the means shown in Figure 1 for providing a surfactant-laden region are only exemplary of several which may be utilized, and therefore should not be deemed to unduly limit the present invention.
  • any surfactant which can significantly reduce the surface tension of water, and/or will allow water to be foamed would be useful in the present invention.
  • exemplary of suitable surfactants to include in the present invention are sodium lauryl sulfate and alpha olefin sulfates and sulfonates preferably having a carbon chain length from 12 to 16, as well as many non-ionic surfactants.
  • Such surfactants are commercially available from a variety of manufacturers.
  • a surfactant laden region is created by applying a surfactant to the surface of a sheet of paper fibers or to the surface of a water receiver, it is thought that appropriate amounts of the surfactants to apply would be preferably 0.01 to 0.1 g/m2.
  • an appropriate surfactant-laden region as provided for herein can be created by the addition of a surfactant to a furnish of paper making fibers.
  • a layer of wet paper-making fibers such as shown by (1) in Figure 1 would contain a sufficient amount of surfactant so that upon wet pressing of the same with a water receiver like felts (10) and/or (11) there would be created the desired surfactant-laden region at an interface between the paper sheet and at least one of the water receivers.
  • the present invention also provides for the use of foam-filled regions which are formed before or during wet pressing at the interface of sheets and water receivers.
  • foam filled regions can also be applied.
  • headboxes can be used to apply surfactant containing foams to either felt (10) or (11) or to the wet paper fibers (1), shown in Figure 1, if desired.
  • the foam once applied, create a foamed region at the interface between the wet paper sheet and a water receiver pressed there against during wet pressing.
  • foam or surfactant-laden regions may be created, for example, at the interface between the paper sheet (1) in Figure 1 and the felts (10) and (11) during wet pressing of the same.
  • one suitable way to achieve such a foamed filled region during the wet pressing step is as follows.
  • one of the pressing rollers is a Yankee dryer (27). If the surface temperature of this dryer is sufficiently high (e.g., at least about 180°F), and the wet papers which are being pressed at station (5) contain or have sprayed thereon compounds which create gases above room temperature (e.g., sodium carbonate, sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, etc.).
  • paper sheets were produced at speeds up to 4000 fpm from a slurry of fibers having an alpha olefin sulfonate surfactant added to create a foamed furnish.
  • Surfactant concentration was about 250 ppm.
  • Wet pressing solids were always higher than those from non-foamed slurries at equivalent machine conditions.

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EP92304095A 1991-05-08 1992-05-07 Verfahren zur Erhöhung des Feststoffgehaltes nach Nasspressoperationen Withdrawn EP0512819A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69704591A 1991-05-08 1991-05-08
US697045 1991-05-08

Publications (1)

Publication Number Publication Date
EP0512819A1 true EP0512819A1 (de) 1992-11-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92304095A Withdrawn EP0512819A1 (de) 1991-05-08 1992-05-07 Verfahren zur Erhöhung des Feststoffgehaltes nach Nasspressoperationen

Country Status (2)

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EP (1) EP0512819A1 (de)
CA (1) CA2068294A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2696482A1 (fr) * 1992-10-07 1994-04-08 Kaysersberg Sa Procédé de fabrication de papier ou de non-tissé en milieu mousse.
US7153390B2 (en) 2001-12-31 2006-12-26 Kimberly-Clark Wordwide, Inc. Process for manufacturing a cellulosic paper product exhibiting reduced malodor
US11255051B2 (en) 2017-11-29 2022-02-22 Kimberly-Clark Worldwide, Inc. Fibrous sheet with improved properties
US11313061B2 (en) 2018-07-25 2022-04-26 Kimberly-Clark Worldwide, Inc. Process for making three-dimensional foam-laid nonwovens
US11591755B2 (en) 2015-11-03 2023-02-28 Kimberly-Clark Worldwide, Inc. Paper tissue with high bulk and low lint

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1118045A (en) * 1964-06-16 1968-06-26 Kalle Ag Manufacture of non-woven fabrics
US3798122A (en) * 1972-06-26 1974-03-19 Kimberly Clark Co Method and apparatus for the production of fibrous sheets
GB2091305A (en) * 1981-01-16 1982-07-28 Willis David Edward Insulating materials and methods of making same
WO1984003112A1 (en) * 1983-02-10 1984-08-16 Scott Paper Co Method and apparatus for producing paper and other nonwoven fibrous webs
US4606944A (en) * 1982-11-12 1986-08-19 Adnovum Ag Dewatering process, procedure and device
WO1988005100A1 (en) * 1987-01-08 1988-07-14 Usg Interiors, Inc. Method for manufacture of lightweight frothed mineral wool panel
WO1988006656A1 (en) * 1985-12-09 1988-09-07 Paper Chemistry Laboratory, Inc. Method for dewatering a wet paper web and introducing functional additives

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1118045A (en) * 1964-06-16 1968-06-26 Kalle Ag Manufacture of non-woven fabrics
US3798122A (en) * 1972-06-26 1974-03-19 Kimberly Clark Co Method and apparatus for the production of fibrous sheets
GB2091305A (en) * 1981-01-16 1982-07-28 Willis David Edward Insulating materials and methods of making same
US4606944A (en) * 1982-11-12 1986-08-19 Adnovum Ag Dewatering process, procedure and device
WO1984003112A1 (en) * 1983-02-10 1984-08-16 Scott Paper Co Method and apparatus for producing paper and other nonwoven fibrous webs
WO1988006656A1 (en) * 1985-12-09 1988-09-07 Paper Chemistry Laboratory, Inc. Method for dewatering a wet paper web and introducing functional additives
WO1988005100A1 (en) * 1987-01-08 1988-07-14 Usg Interiors, Inc. Method for manufacture of lightweight frothed mineral wool panel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2696482A1 (fr) * 1992-10-07 1994-04-08 Kaysersberg Sa Procédé de fabrication de papier ou de non-tissé en milieu mousse.
EP0592277A1 (de) * 1992-10-07 1994-04-13 Kaysersberg Schaumverfahren zur Herstellung von Papier oder Faservlies
US7153390B2 (en) 2001-12-31 2006-12-26 Kimberly-Clark Wordwide, Inc. Process for manufacturing a cellulosic paper product exhibiting reduced malodor
US7462260B2 (en) 2001-12-31 2008-12-09 Kimberly-Clark Worldwide, Inc. Process for manufacturing a cellulosic paper product exhibiting reduced malodor
US11591755B2 (en) 2015-11-03 2023-02-28 Kimberly-Clark Worldwide, Inc. Paper tissue with high bulk and low lint
US11255051B2 (en) 2017-11-29 2022-02-22 Kimberly-Clark Worldwide, Inc. Fibrous sheet with improved properties
US11313061B2 (en) 2018-07-25 2022-04-26 Kimberly-Clark Worldwide, Inc. Process for making three-dimensional foam-laid nonwovens
US11788221B2 (en) 2018-07-25 2023-10-17 Kimberly-Clark Worldwide, Inc. Process for making three-dimensional foam-laid nonwovens

Also Published As

Publication number Publication date
CA2068294A1 (en) 1992-11-09

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