EP0150777B2 - Verfahren zur Herstellung eines faserigen Vliesstoffes - Google Patents

Verfahren zur Herstellung eines faserigen Vliesstoffes Download PDF

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Publication number
EP0150777B2
EP0150777B2 EP19850100470 EP85100470A EP0150777B2 EP 0150777 B2 EP0150777 B2 EP 0150777B2 EP 19850100470 EP19850100470 EP 19850100470 EP 85100470 A EP85100470 A EP 85100470A EP 0150777 B2 EP0150777 B2 EP 0150777B2
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EP
European Patent Office
Prior art keywords
liquid
foamed
air
fibers
foam
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Expired - Lifetime
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EP19850100470
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English (en)
French (fr)
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EP0150777B1 (de
EP0150777A2 (de
EP0150777A3 (en
Inventor
James O. Cheshire
Douglas L. Lindgren
Robert J. Marinack
Bruce W. Janda
Robert S. Thut
John T. Larkey
Ray E. Jostad
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Fort James Corp
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James River Corp of Virginia
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Priority claimed from US06/574,287 external-priority patent/US4543156A/en
Application filed by James River Corp of Virginia filed Critical James River Corp of Virginia
Priority to AT85100470T priority Critical patent/ATE69273T1/de
Publication of EP0150777A2 publication Critical patent/EP0150777A2/de
Publication of EP0150777A3 publication Critical patent/EP0150777A3/en
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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
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • This invention relates to improvements in paper and other non-woven fibrous webs.
  • this invention is directed to a method of making improved non-woven fibrous webs and to the resulting products of the process.
  • non-woven fibrous webs e.g. paper towels and facial or toilet tissue, having superior uniformity and controlled tensile strenght may be produced on high speed paper making machines.
  • High quality facial and toilet tissue are usually produced from refined high grade wood pulp on a fourdrinier type paper making machine wherein a dispersion or furnish of bleached wood pulp in an aqueous carrier is uniformly dispensed onto a moving belt to form continuous web.
  • a dispersion or furnish of bleached wood pulp in an aqueous carrier is uniformly dispensed onto a moving belt to form continuous web.
  • the wood fibers are dispersed in water to form the furnish;
  • foam forming processes have been developed in which the fibers are dispersed in a foamed aqueous solution of a surfactant which forms a relatively stable foam capable of supporting the fibers.
  • FIG. 1 of the drawings a preferred form of apparatus of the twin-wire type for making a non-woven fibrous web, such as paper, is illustrated wherein reference numerals 11 and 12 designate first and second endless, woven, fluid permeable forming wires of substantially similar weave and type used in the forming of the non-woven webs.
  • Forming wire 11 is supported in a conventional manner on rolls, including those designated generally by the numerals 13, 14, 15, and 16.
  • forming wire 12 is supported on rolls of conventional design, two of which are illustrated and designated by reference numerals 18 and 18a.
  • the support rolls for forming wires 11 and 12 are so positioned as to cause the wires to converge to form a nip 17 just ahead of cylindrical forming roll 19 as illustrated in Fig. 2.
  • the wires 11 and 12 are driven so that the wrapped portions on forming roll 19 move undirectionally, at the same speed, in the direction of rotation A of roll 19.
  • wires 11 and 12 converge on forming roll 19, at slightly different angles, forming a wedge-shaped nip 17 therebetween into which a jet 20 of a foamed liquid-fiber dispersion is directed from a pressurized headbox 21 as illustrated.
  • the surface of roll 19 is smooth and fluid impervious, and wires 11 and 12 are so tensioned that they are operative to squeeze the foamed liquid-fiber dispersion between them to force liquid 20a through the wire 11, hereinbelow also referred to as the outer wire.
  • Liquid 20a forced through the outer-wire 11 is directed through the open inlet port 23 of a saveall 22, and, with the aid of defectors 22a, collected therein as seen at 20b.
  • Wire 12 the inner wire on the forming roll, supports web W as it is carried away from the forming roll for drying and further conventional treatment.
  • the foamed liquid and fiber furnish is supplied to headbox 21 through a conduit 24, and the residual liquid removed from the web W is withdrawn from saveall 22 through a conduit 25, to a pump 28 for recirculation through conduit 24 leading to headbox 21.
  • a parallel liquid flow circuit comprises conduit 29 connected to conduit 25, a pump 30, a conduit 31 leading into the top of mix tank 32, and a conduit 33 leading from the bottom of mix tank 32 provided with a pump 34 which a dispersion of fibers in foamed liquid through conduit 35 to conduit 24.
  • a water-surfactant solution is supplied to the mix tank 32 from a source 36 through conduit 40.
  • Pulp comprising fibers of the type used in paper making is supplied to tank 32 through conduit 37a leading from a de-watering press 37 to which a pulp slurry is supplied from a suitable source (not illustrated).
  • An agitator 38 is positioned in and operative to mix the contents of tank 32.
  • the rate of pulp feed to the de-watering press is controlled to produce webs of the desired basis weighs at the production speed of the machine.
  • Typical basis weights are in a range of from about 3.6 kg/ream (279 m 2 ) [8 Ibs/ream (3000 ft 2 )] to about 17.2 kg/ream (38 lbs/ream).
  • water from a suitable supply source 46 is introduced into mix tank 32 through supply conduits 45 and 45a.
  • a concentrated aqueous solution of surfactant is added to tank 32 through conduit 40 in the amount necessary to provide a predetermined surfactant concentration in mix tank 32 required to produce a foamable liquid capable of producing a relatively stable foam which will support the fibers making up the foamed fiber furnish supplied to the headbox.
  • the mix tank 32 is partially filled, e.g., to about one half to three fourths its capacity, with sufficient foam forming liquid to fill the pumps, conduits, headbox, and saveall when circulation is initiated and to provide a residual volume in the mix tank in the range of one fourth to one third of its capacity.
  • An aqueous solution of a suitable anionic surfactant e.g., an alpha olefin sulphonate has been used successfully at a preferred concentration of about 300 ppm by volume.
  • a number of other surfactants are suitable as a water additive for purposes of the present invention, being generally classified as nonionic, anionic, cationic, or amphoteric.
  • Suitable class of surfactant is dependent upon chemical characteristics of such other commonly used additives which may be present in the manufacture of fibrous webs.
  • additives include, singly or in homogeneous mixtures thereof, latexes, binders, debonding agents, dyes, corrosion inhibiting agents, pH controls, retention aids, creping aids, and other substances used in papermaking processes.
  • U.S. Patent Nos. 3,716,449 and 3,871,952 discloses specific nonionic, anionic, and cationic surfactants that have been found suitable in the art of forming fibrous webs from dispersions of fibers in foam.
  • U.S. Patent No. 4,056,456 discloses additional surfactants, including some classified as amphoteric, that are suitable for practice of the present invention. The disclosures of these patents are included, by reference, in the present application for their teachings of surfactant materials.
  • the forming wires 11 and 12 are driven at a speed of about 762 m per minute [2500 fpm (feet per minute)].
  • the pumps 28, 30, and 34 are energized to pump foamable liquid from saveall 22 and the suspension of fibers in foam from mix tank 32 to headbox 21, from which jet 20 is directed into nip 17 at the juncture of the forming wires 11 and 12.
  • the rotational speeds of pumps 30, 34 and 28 are regulated to establish fluid flow rates through the system which result in a preferred materials balance at typical flow rates, pump 28 handles about three fourths of the desired volume of flow to the headbox 21 while pump 34 handles the remainder.
  • Pump 30 is regulated to maintain a substantially constant level in mix tank 32.
  • the flow rate of foamed fiber furnish is regulated to achieve a jet velocity in the range of from about 90% to about 150% of the speed of the forming wires. Usually a jet velocity of about 110% of the speed of the wires is preferred.
  • Forming wire speeds may be in the range of from about 305 m per minute (1000 fpm) to about 2134 m per minute (7000 fpm), or more, depending upon the operating conditions and the physical properties of the foamed fiber furnish and the forming wires.
  • the foamed fiber furnish impinges on the forming wires 11 and 12, the furnish is uniformly distributed over the width of the wires.
  • pressure is applied to the furnish which, combined with the force of liquid jet 20, causes the foamable liquid to flow through interstices of outer wire 11.
  • the inner wire 12 has its interstices closed to fluid flow by the underlying solid surface of forming roll 19.
  • air travelling with the wire as well as air in its interstices is entrained, thereby generating foam in the foamable liquid so that, once started, the foam generation (or regeneration) is a self sustaining operation.
  • Foam 20a is collected in saveall 22 and directed to the mix tank 32 via conduits 25, 29 and 31 and to headbox 21 By way of conduits 25, 27, and 24.
  • the method of generating and regenerating foam is so effective that no other means of foam generation is required.
  • the air content of the foamable liquid increased from nearly zero to a preferred value of about 67 volume percent.
  • Maximum bubble size of the foam during operation is, for example, in a range from about 20 /1.m to about 200 /1.m, which is less than the lengths of the suspended fibers.
  • Optimum relationships of bubble dimension to fiber dimensions are dealt with in the referenced U.S. Patent Nos. 3,716,449 and 3,871,952, and are readily achieved by the apparatus and method of the present invention.
  • a pulp of papermaking fiber in water is prepared conventionally to a consistency about 1.0 to 4.0% fiber by weight.
  • the conventionally prepared pulp is dewatered in a stock press 37 and then introduced into mix tank 32. Leaving the stock press 37 through line 37a, the pulp has a consistency sufficient to require the addition of makeup water and surfactant solution to the system via lines 40 and 40a respectively.
  • the desired consistency of the pulp in line 37a can be calculated easily by material balance on the basis of limiting the loss of surfactant from the system to that amount inevitably carried away in the wet web 12. In general, the pulp consistency is between 8 and 50 weight percent fiber, preferably between 15 and 35 weight percent. Water removed by press 37 may be recycled.
  • the dewatered high consistency pulp from line 37a is introduced to the mix tank 32 well below the liquid level therein at a rate dependent upon the material balance. About 2 kg/t to 11 kg/t (4 to 22 pounds per ton) of surfactant of dry fiber in web W is lost from the system and is made up through lines 40 and 40a.
  • Fiber is introduced from the dewatering press 37 to mix tank 32 at a rate corresponding to the desired web production rate.
  • a slurry of about 3 weight percent fibers normally is fed to press 37, and a slurry of from about 25 to about 50 weight percent, preferably about 35 weight percent fibers, leaves the press 37 as feed to mix tank 32.
  • dry fibers may be introduced directly to the foamed liquid in mix tank 32 in suitable proportions for achieving desired basis weights. With all pumps energized, the foam-fiber mixture is directed by pump 34 from mix tank 32 through conduits 33 and 35 into conduit 24, where it combines with foamed liquid from saveall 22, through conduits 25, 27 and 24, and the resulting foamed fiber furnish supplied to headbox 21 from which it is fed onto wires 11 and 12.
  • Fibers and some of the liquid remain on the wires forming the product web.
  • the major portion of the foamable liquid passes through wire 11.
  • Foam is regenerated by air from the wires as explained above. Control of air content of the foam is achieved by controlling the amount of surfactant added to the system in mixing tank 32.
  • the actual concentration of surfactant needed is a function of many variables and is best determined by trial, some of the variables are surfactant type, water hardness, water temperature, furnish ingredients and circulation time in the system.
  • a loss of foam occurs following the introduction of fiber and its deposition on the forming wires, since liquid is removed from the system with the fibrous web.
  • the foamable liquid lost in this manner is continuously replenished, the water being replenished by water contained in the pressed pulp from press 37 supplemented by water supplied through conduit 45 and the surfactant solution replenished through supply conduit 40.
  • the relative proportions of water and concentrated surfactant solution are suitably regulated in the range of 150 to 450 ppm (parts per million) surfactant by weight, to maintain air content of the foam in the desired range of from about 55 to about 75 percent.
  • Control of air content is achieved by maintaining a predetermined concentration of surface active agent in the foamable liquid.
  • concentration of surfactant depends on many factors including the particular choice of surfactant, the temperature of the system, the hold up time, i.e. time required to make one complete cycle of foam through the system and the speed of the wires, and is best determined for any given system by trial.
  • the surfactant concentration other factors remaining constant, the air content of the foam can be held substantially constant without the need for a foam generating device or for metering of air by separate means.
  • Foamed liquid from the saveall 22 is transferred by pump 30 through lines 25, 29 and 31 to mix tank 32.
  • Pump 30 preferably is of the twin screw type capable of transferring low density liquids such as the foamed liquid.
  • the volume of foamed liquid thus transferred is that amount necessary to obtain a mix tank consistency of between about 0.3 to about 4 percent fiber by weight, preferably between 1.5 to 4 percent.
  • An agitator 38 provides the requisite energy to disperse the fibers in the foamed liquid.
  • the foamed liquid furnish leaves the mix tank 32 by line 33, a twin screw pump 34 providing the motive energy therefor.
  • the discharge from pump 34 through line 35 is passed through line 24 to headbox 21.
  • the foamed liquid has substantially the same air content and bubble size quality as in the foam recovered in saveall 22 as the amount of water added with the untreated fibers through line 45 is minor in comparison to the water in recycled foamed liquid added through line 31.
  • the fibers from press 37 can be dispersed rapidly.
  • the size of the mix tank and accompanying equipment is reduced, the ability to rapidly disperse the fibers enhanced, and mixing energy is reduced.
  • the foamed liquid is subjected to shearing action in the mixer 38 which helps maintain fine foam structure while, at the same time, the fibers are subjected to less intensive shearing action than in a conventional water dispersion system so that less alteration of the fiber structure takes place. Consistency of the foamed liquid is ensured by blending the dispersion of fibers in foamed liquid from mix tank 32 with foamed liquid from line 24 to that in line 35 is in the range of from about 6:1 to about 1:1 in the preferred process embodiment. Hence, when foam from line 27 is combined with the dispersion from mix tank 32, the foamed liquid in line 24 will have substantially the same quality as that in the saveall 22.
  • the final (headbox) furnish in line 24 is at a consistency of about between 0.3 to about 1.2% fiber by weight, and has a viscosity of about 10 cP to about 35 cP on a fiber free basis. Because of the head induced by pumps 38 and 34, the bubble size of the foamed liquid, which is a compressible fluid, is reduced to about 20 to about 200 /1.m, the averaging bubble size being in the range of about 50 to about 100 /1.m.
  • the pressure drop through nozzle 22 is about 0.3 to 1.7 bar [5 to 25 psi (pounds per square inch)-], preferably 0.7 to 1.4 bar (10 to 20 psi).
  • the foamed fiber furnish is injected into nip 17 and uniformly across the wires 11 and 12. It has been found that the velocity of the jet from nozzle 22 relative to the speed of the forming wire is a critical factor in the production of a web having a high degree or uniformity of fiber distribution and the desired tensile or tear strength relationships.
  • twin forming wires are employed with forming wire speeds in the range of from about 306 m per minute (1000 fpm) to about 2134 m per minute (7000 fpm) or more. It is essential that the pressure and flow rate of the furnish be regulated to achieve a jet velocity from nozzle 22 of from about 90% to 150% of the speed of the forming wires. The jet is directed into the nip 17 in a direction of travel of the forming wires.
  • the kinetic energy of the jet is converted to potential energy building up sufficient pressure between the wires to lift wire 11 away from wire 12 and at the same time distribute the foam furnish uniformly along the wires without comb or drag relative to the headbox.
  • the relationship of velocity of the jet relative to speed of the wires effectively prevents striation of the fibers in the web.
  • the pressure created as the outer wire 11 moves onto the inner wire 12, combined with the force of liquid jet 20, causes the foamable liquid to flow through interstices of outer wire 11. Substantially no liquid flows through the inner wire 12 which has its interstices closed to fluid flow by the underlying solid surface of forming roll 19.
  • the formation of the product web is greatly improved as compared with webs produced by conventional processes, that is, the uniformity of the distribution of individual fibers comprising the web is enhanced as observed by absence of flocs in the web upon visual inspection.
  • a better formed web characteristically improves subsequent web processing operations inasmuch as the web is less likely to tear during drying, creping, embossing and the like on a high speed fourdrinier machine.
  • Formation of the web may be measured in a Thwing formation tester under Method No. 525 of the Institute of Paper Chemistry.
  • the Thwing Index is the ratio of localized variations in transparency to average transparency.
  • Low basis weight products obtained by conventional web processing methods e.g., tissue, towel, and napkin products having a basis weight between about 3.6 kg to 13.6 kg/ream (279 m 2 ) [8 to 30 lbs/ream (3000 sq ft)]
  • TI values are higher while at faster speeds, the formation is affected adversely.
  • TI values were measured at between about 20 to 25, significantly higher than comparative wet laid webs.
  • the tensile strengths in the machine direction of the product webs produced by the process of this invention are generally comparable to those produced by conventional wet pulp papermaking processes employing a water slurry of papermaking fibers and considerably greater in the cross machine direction than those produced with conventional processes employing foamed liquid as the carrier liquid for the fiber furnish.
  • Conventionally foamed fiber furnish processes produce a product having a low tensile strength in the cross machine direction.
  • the relatively low tensile strength in the cross machine direction in conventional foamed liquid systems apparently occurs because the fibers in the web are combed or striated as they are laid on the carrier wire from the headbox by reason of the speed of the wire relative to the headbox and the thickness and relative stability of the foamed fiber furnish laid on the carrier wire.
  • the foamed fiber furnish is jetted into the nip in a twin wire system at a velocity nearly equal to or in excess of the wire speeds avoiding combing or striation. Sufficient hydrogen bonding of the fibers is obtained to provide a product web of adequate strength in both the machine direction and the cross machine direction.
  • the geometric mean tensile strengths of webs produced by the process of the present invention are equivalent to those produced by conventional water-formed fourdrinier webs when the furnish, refining and basis weights are equivalent.
  • a selected ratio of machine direction (MD) to cross machine direction (CD) tensile strengths is advantageous.
  • Machine direction tensile strength is important for processing webs through operations, such as embossing, slitting, perforating and rewinding into consumer rolls, whereas in the end use by the consumer, equal tensile strengths in cross machine and machine direction may be desireable.
  • the process of this invention allows the tensile ratio to be optimized to fill the needs of tensile ratio demands.
  • a bonding agent may be necessary to provide adequate tensile strength as required by the ultimate end use.
  • Suitable bonding agents include cationic starch; polyvinyl alcohol; pearl starch; natural gums (tragacanth, karaya, guar); natural and synthetic latex, including polyacrylates, e.g., polyethylacrylate, and copolymers; vinyl acetate-acrylic acid copolymers; polyvinylacetates; polyvinyl chlorides; ethylenevinyl acetates; styrene-butadiene carboxylates; polyacrylonitriles; and thermosetting cationic resins, e.g., urea formaldehyde resins, melamine formaldehyde resins, glyoxal-acrylamide resins and polyamide-epichlorhydrin resins as disclosed in U.S. 3,819,470. Bonding materials are desirable where the fibers used in the web are not self-bonding, as in
  • the fiber furnish may be made up of unrefined softwood fibers of a type which readily floc on water-forming papermaking equipment, and may comprise in addition to wood pulp, synthetic fibers, e.g. rayon fibers up to 6 denier in diameter and 1.9 cm (3/4 inch) long which do not yield satisfactory tissue products in conventional water laid papermaking processes.
  • synthetic fibers e.g. rayon fibers up to 6 denier in diameter and 1.9 cm (3/4 inch) long which do not yield satisfactory tissue products in conventional water laid papermaking processes.
  • a run was made on a high speed twin wire paper machine at about 305 m per minute (1000 fpm) using repulped Ontario Soffwood Kraft (OSWK) fibers that had been refined to 400 CSF.
  • the fibers were added directly to the mix tank, the furnish therein being at 1.8% consistency. Headbox consistency was adjusted to 0.45% by dilution with foamed liquid from the silo.
  • Arco "Ultrawet A-OK" surfactant was used to generate the foam.
  • the webs were wet pressed and subsequently dried and creped or a Yankee dryer, but were not calendered.
  • the ratio of the machine direction (MD) tensile strength to cross machine direction tensile strength was 3.1, i.e., the tensile strength in this cross machine direction is about 32 percent of the tensile strength in the machine direction.
  • Test runs were made on a high speed twin wire paper machine operation at 458 m per minute (1500 fpm). In each run a pulp of 3.5% consistency was made comprising 50% OSWK and 50% OHWK (Ontario Hardwood Kraft) fibers. After pulping, the slush pulp was pressed to 28 weight consistency and added to the mix tank, and a foamed liquid furnish of about 0.6% percent fiber by weight delivered to the headbox. Air content ranged between 58 to 70%. The webs were wet pressed, dried and creped. In Runs 2 and 3 the webs were calendered.
  • the furnish was repulped baled fiber without any refining consisting of 50% Ontario hardwood and 50% Ontario softwood bleached sulfate wood pulp.
  • the air content of the foam was maintained at 60% while wire tension was 536 kg/m (30 pli).
  • the product was creped and calendered and samples were removed from a rewound roll for testing.
  • the product tensile strength at a theoretical efflux ratio of 1.09 tested 298 g/7.62 cm (298 g/3 inch) machine direction and 300 g/7.62 cm (300 g/3 inch) cross machine direction for a web of 4,082 kg (9 pounds) per ream basis weight.
  • the efflux ratio is defined as the ratio of the calculated velocity of the jet of foam fiber furnish from the headbox to the velocity of the forming wires.
  • the jet and the wires have a velocity of 610 m (2000 feet) per minute.

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Claims (6)

1. Verfahren zur Herstellung einer Faservliesbahn auf einer bewegten porösen Auflage aus einem geschäumten Faserstoffeintrag, der Fasern aufweist, die in einem Schaum, der Wasser und ein grenzflächenaktives Mittel aufweist und 55-75 Vol.-% Luft enthält, dispergiert sind, und wobei durch die poröse Auflage tretende Flüssigkeit gesammelt und erneut zu einer geschäumten Faserstoffeintrag-Herstellungsstufe umgewälzt wird, dadurch gekennzeichnet, daß das Verfahren die folgenden Schritte aufweist:
(i) Bilden einer geschäumten Flüssigkeit durch Mitreißen von Luft in eine schäumbare Flüssigkeit, die Wasser und grenzflächenaktives Mittel aufweist und durch die poröse Auflage tritt,
(ii) Dispergieren von Fasern in der geschäumten Flüssigkeit, die 55-75 Vol-% Luft enthält, um den geschäumten Faserstoffeintrag zu bilden,
(iii) Zuführen des geschäumten Faserstoffeintrags ohne wesentliche schaumerzeugende Verwirbelung oder Bewegung zu der bewegten porösen, bahnbildenden Auflage,wo Fasern des Faserstoffeintrags auf der Auflage abgelagert werden,um die Faservliesbahn zu bilden, wobei Flüssigkeit aus dem Eintrag unter Mitreißen von Luft durch die Auflage geleitet wird, um dadurch geschäumte Flüssigkeit nach Maßgabe von Schritt (i) zur erneuten Umwälzung zu regenerieren, und
(iv) Aufrechterhalten des Luftanteils des Schaums auf einem gewünschten Wert ausschließlich durch Einstellen der Konzentration von grenzflächenaktivem Mittel in der schäumbaren Flüssigkeit.
2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß der geschäumte Faserstoffeintrag 0,3-1,2 Gew.-% Fasern enthält.
3. Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß Luft in der geschäumten Flüssigkeit in Form von Blasen mit einem mittleren Durchmesser von ca. 20-200 um (Mikron) vorliegt.
4. Verfahren nach einem der vorhergehenden Ansprüche, wobei der geschäumte Faserstoffeintrag mit der bewegten porösen Auflage als ein Flüssigkeitsstrahl, der eine Geschwindigkeit im Bereich von 90 bis ca. 150 % derjenigen der bewegten porösen Auflage hat, in Kontakt gebracht wird.
5. Verfahren nach Anspruch 4,
dadurch gekennzeichnet, daß die Geschwindigkeit des Strahls ca- 110 % derjenigen der bewegten porösen Auflage beträgt.
6. Verfahren nach einem der vor hergehenden Ansprüche,
dadurch gekennzeichnet, daß der ca. 55-75 Vol.-% Luft enthaltende wäßrige Schaum erzeugt wird durch Leiten der im wesentlichen faserfreien schäumbaren Flüssigkeit zu der und durch die bewegte poröse bahnbildende Auflage unter Erzeugung einer geschäumten Flüssigkeit durch Mitreißen von Luft darin, wobei die durch die poröse Auflage tretende geschäumte Flüssigkeit aufgefangen und erneut zu der und durch die poröse Auflage umgewälzt wird, bis die geschäumte Flüssigkeit ca. 55-75 Vol.-% Luft in Form von Blasen mit einem mittleren Durchmesser von 20-200 um (Mikron) enthält.
EP19850100470 1984-01-26 1985-01-17 Verfahren zur Herstellung eines faserigen Vliesstoffes Expired - Lifetime EP0150777B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100470T ATE69273T1 (de) 1984-01-26 1985-01-17 Verfahren zur herstellung eines faserigen vliesstoffes.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US574287 1984-01-26
US06/574,287 US4543156A (en) 1982-05-19 1984-01-26 Method for manufacture of a non-woven fibrous web
US57843184A 1984-02-09 1984-02-09
US578431 1984-02-09

Publications (4)

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EP0150777A2 EP0150777A2 (de) 1985-08-07
EP0150777A3 EP0150777A3 (en) 1988-08-10
EP0150777B1 EP0150777B1 (de) 1991-11-06
EP0150777B2 true EP0150777B2 (de) 1994-11-30

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EP19850100470 Expired - Lifetime EP0150777B2 (de) 1984-01-26 1985-01-17 Verfahren zur Herstellung eines faserigen Vliesstoffes

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DE (1) DE3584572D1 (de)

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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

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Publication number Priority date Publication date Assignee Title
ATE151481T1 (de) * 1991-01-15 1997-04-15 James River Corp Seidenpapier mit grosser weichheit
US5200035A (en) * 1992-01-24 1993-04-06 James River Corporation Of Virginia High uniformity foam forming
FI107951B (fi) * 1999-12-08 2001-10-31 Dynea Chemicals Oy Vaahtoavat kuitumateriaalin lujuuteen vaikuttavat koostumukset

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Publication number Priority date Publication date Assignee Title
DE1560872A1 (de) * 1964-06-16 1970-06-11 Kalle Ag Verfahren zur Herstellung von Wirrfaservliesen
US4443297A (en) * 1980-08-18 1984-04-17 James River-Dixie/Northern, Inc. Apparatus and method for the manufacture of a non-woven fibrous web
US4488932A (en) * 1982-08-18 1984-12-18 James River-Dixie/Northern, Inc. Fibrous webs of enhanced bulk and method of manufacturing same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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EP0150777B1 (de) 1991-11-06
DE3584572D1 (de) 1991-12-12
EP0150777A2 (de) 1985-08-07
EP0150777A3 (en) 1988-08-10

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