EP1626122B1 - Procédé et dispositif pour produire une bande de matière fibreuse pourvue d'une structure superficielle tridimensionelle - Google Patents

Procédé et dispositif pour produire une bande de matière fibreuse pourvue d'une structure superficielle tridimensionelle Download PDF

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Publication number
EP1626122B1
EP1626122B1 EP05109471A EP05109471A EP1626122B1 EP 1626122 B1 EP1626122 B1 EP 1626122B1 EP 05109471 A EP05109471 A EP 05109471A EP 05109471 A EP05109471 A EP 05109471A EP 1626122 B1 EP1626122 B1 EP 1626122B1
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EP
European Patent Office
Prior art keywords
embossing
belt
fibrous web
embossing belt
suction
Prior art date
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Expired - Lifetime
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EP05109471A
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German (de)
English (en)
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EP1626122A1 (fr
Inventor
Thomas Scherb
Jeffrey Herman
Harald Schmidt-Hebbel
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1626122A1 publication Critical patent/EP1626122A1/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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
    • 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
    • D21F11/006—Making patterned paper

Definitions

  • the invention relates to a method and an apparatus for producing a provided with a three-dimensional surface structure fibrous web, in particular tissue or sanitary membrane.
  • TAD Through Air Drying
  • the aim of the invention is to provide an improved method and an improved device of the type mentioned, with which, in particular, even without the use of a larger TAD-drying device in an economical and correspondingly cost-effective manner, a high quality of the final product can be achieved.
  • a corresponding quality can be achieved.
  • the WO 93/00475 and the WO 00/19014 describe a process for the production of tissue paper in which the tissue web is pressed onto an embossing sieve and then dried by means of air flow in the direction of the embossing sieve in a TAD process.
  • the US 6,103,062 describes a process for the production of tissue paper in which the tissue paper is pressed onto a stamping belt in front of the Yankee drying cylinder by means of a shoe press. According to this publication, the tissue web is further dehydrated in the shoe press, with a press felt with capillary action being arranged on both sides of the tissue web.
  • the WO 99/47749 shows a process for the production of tissue paper, in which the tissue web is guided on an embossing belt together with a felt through a press nip formed between a roller and a Yankee cylinder.
  • the US 4,102,737 teaches a machine for the production of tissue paper, in which the tissue web is dried on a stamping tape by means of a TAD process.
  • this object is achieved by a method for producing a fibrous web provided with a three-dimensional surface structure, in particular tissue or hygiene web, in which the fibrous web is pressed at a dry content ⁇ 35% by means of a first pressure field on an embossing belt, e.g.
  • embossing fabric As an embossing or structured band ("imprinting fabric”, “structured fabric”), preferably an embossing screen or an embossing membrane is used.
  • the fibrous web is pre-stamped after the forming area.
  • At least the first pressure field is generated by means of a arranged on the side facing away from the fibrous web side of the embossing belt Saugelements to suck the fibrous web in the surface structure of the embossing belt.
  • a so-called wet vacuum can be used as a suction element.
  • the fibrous web in the further pressure field is gentle, i. preferably over a lengthened in the web running direction distance, is pressed.
  • the further pressure field is preferably generated by means of a press nip.
  • this Preßnip can be generated for example between a drying cylinder and a counter element, wherein the guided through the press nip fibrous web is in contact with the surface of the drying cylinder and rests with its other side on the embossing belt.
  • a drying cylinder in particular a so-called Yankee cylinder can be used.
  • a counteracting element cooperating with the drying cylinder it is possible in particular to use a shoe press unit which comprises a flexible band guided in the region of the press nip via a press shoe.
  • a shoe press roll provided with a flexible roll shell is preferably used as the shoe press unit.
  • a provided within the loop of the embossing belt preferably soft band, in particular felt, is guided by the Preßnip generating the further pressure field.
  • the soft felt may, for example, be a felt with a foamed layer, which, as will be explained in more detail below, contributes to drainage of the fibrous web due to its capillary action (capillary fabric).
  • a preferred practical embodiment of the method according to the invention is characterized in that the pre-embossed fibrous web is dried on the drying cylinder or Yankee cylinder, the fibrous web is creped and / or the fibrous web is subsequently wound up.
  • the dry content at which the fibrous web is pre-embossed, and / or the dry content at which the three-dimensional surface structure is fixed in each case ⁇ 35%, in particular ⁇ 30% and preferably ⁇ 25%.
  • the water retention capacity and the volume increased sustainably which means that even with the use of the final product, such as a respective tissue or tissue web, the desired embossment is still present.
  • the advantage of a higher water retention capacity for towel tissue (towel paper) also comes into play when using the end product in question.
  • an evacuated device is used between the suction pad producing the first pressure field and the press pad generating the further pressure field and the fibrous web is guided together with an embossing belt both via the evacuated device and through the press nip. It is advantageous if the evacuated device has a curved surface and the fibrous web and the embossing belt are guided over this curved surface.
  • a suctioned device for example, a suction roll can be used.
  • the felt is conveniently passed between the embossing belt and the flexible belt of the shoe press unit through the press nip.
  • the particular soft felt is also passed over the evacuated device.
  • this is preferably associated with a standing under pressure hood to support the negative pressure effect of the evacuated device.
  • the felt can be conditioned, for example, by means of a suction device, in particular by means of a suction box, before it is brought together with the embossing belt carrying the fibrous web.
  • a suction device in particular by means of a suction box
  • the dry content of the felt can be increased and the felt can be cleaned.
  • the embossing band can be placed in front of the evacuated device, i.
  • the suction roller are guided over the suction element or the Najisauger to suck the fibrous web in the three-dimensional surface structure of the embossing belt and thus impart this structure to the band.
  • the relevant suction element brings a corresponding increase in dry content with it.
  • the felt is brought together only after the evacuated device with the embossing belt carrying the fibrous web.
  • the evacuated device is therefore not wrapped in this case of the felt, whereby the suction effect of this device is increased and increased according to the dry content.
  • the wet molding effect is maintained by the gentler dewatering by the so-called TissueFlex, which operates at a lower pressure and longer residence time compared to a shoe press roll.
  • the length of the press nip of the drying cylinder and the shoe press unit considered in the web running direction greater than a value of about 80 mm selected and the shoe press is designed so that over the Preßnipin results in a pressure profile with a maximum pressure, which is less than or equal to a value of about 2.5 MPa. This ensures a gentle pressing, with which it is avoided that the structure produced in the fibrous web, such as tissue or sanitary membrane, is flattened out again.
  • suction roll between the suction element producing the first pressure field and the press nip, which is preferably associated with a pressure hood.
  • At least one dewatering screen with zonal different screen permeability is used in the forming area.
  • the relevant drainage sieve can be provided in particular as an outer sieve.
  • a corresponding embodiment of the method is particularly advantageous in the production of towel tissue.
  • the screen produces a fine structure which increases the rate of water absorption and, in conjunction with the embossing of the present invention, brings with it increased water retention.
  • a former with two circulating dewatering belts which converge to form a Stoffeinlaufspaltes and are passed over a forming element such as in particular a forming roller, and as not coming into contact with the forming element in contact Outside belt and / or as inner band a drainage sieve with zonal different Sieb trim is used.
  • a forming element such as in particular a forming roller
  • an embossing belt and preferably as an outer belt, a dewatering screen with zonal different Sieb prepare be used as an inner band.
  • the fibrous web is preferably taken over by an embossing belt from the inner band.
  • the web can be wet embossed by means of the embossing belt, for example by means of a suction box in front of the press.
  • an embossing belt eg embossing screen or embossing membrane, led, which is structured so that results for this embossing belt compared to the area ratio of recessed zones or holes smaller area ratio of raised or closed zones and Accordingly, in the Preßnip a smaller area fraction of the fibrous web is pressed.
  • the smaller areal proportion of raised or closed zones provides the high density web areas for strength, while the larger areal fraction of recessed zones or holes remaining at least substantially unpressed will provide the desired water absorbency and volume as previously limited a complex and expensive fürströmungs- or TAD drying were achieved.
  • an embossing belt can advantageously be used in which the areal proportion of raised or closed zones is ⁇ 40% and is preferably in a range from about 25 to about 30%.
  • an embossing belt is used in which the raised zones and recessed zones are offset by cranks, i. result from crossing points of weft and warp threads, a screen mesh.
  • an embossing membrane can also be used, with which the raised and recessed zones result through the holes. In this case, it is advantageous that 100% of the surface is pressed around the holes and results in a higher strength.
  • the embossing belt in question can be guided together with the fibrous web, for example, again over a drying cylinder, in particular Yankee cylinder.
  • a shoe press unit can in particular be used again.
  • the length of the press nip considered in the web running direction as well as the pressure profile resulting over the press nip length can in particular be selected again as stated above.
  • Creping the web can improve the water absorbency by 50%, and taking this into account, TAD towel quality water absorption can be achieved.
  • the WO 93/00475 and the WO 00/19014 describe a process for the production of tissue paper in which the tissue web is pressed onto an embossing sieve and then dried by means of air flow in the direction of the embossing sieve in a TAD process.
  • the US 6,103,062 describes a process for the production of tissue paper in which the tissue paper is pressed onto a stamping belt in front of the Yankee drying cylinder by means of a shoe press. According to this publication, the tissue web is further dehydrated in the shoe press, with a press felt with capillary action being arranged on both sides of the tissue web.
  • the WO 99/47749 shows a process for the production of tissue paper, in which the tissue web is guided on an embossing belt together with a felt through a press nip formed between a roller and a Yankee cylinder.
  • the US 4,102,737 teaches a machine for the production of tissue paper, in which the tissue web is dried on a stamping tape by means of a TAD process.
  • the foamed layer fabric may comprise a suction roll having a diameter of e.g. about 2 to 3 m or more suction rolls of smaller diameter, preferably two suction rolls with a diameter of, for example, in each case about 2 m, loop.
  • the residence time of the web in the area of the suction roll or the suction rolls should expediently be greater than about 0.15 s and less than about 0.40 s.
  • the respective suction roll can be placed on its underside, e.g. be applied with vacuum, or it can be used a Saugsalze with associated Siphonabzug.
  • the water can be thrown off, for example by centrifugal force in a gutter.
  • the suctioned device can, in particular, again be associated with a hood under overpressure in order to support the negative pressure effect of the evacuated device.
  • the fibrous web is preferably guided together with the embossing belt and a membrane through the pressure chamber.
  • the basic principle of such a displacement press, at the water in the fibrous web is displaced by air, for example, in the DE 19946972 described.
  • the invention is particularly applicable to Crescent Formers, Duo Formers, C-Wrap Formers, S-Wrap Formers and to the manufacture of multi-layer and multi-ply tissue.
  • Fig. 1 shows a schematic partial representation of an apparatus 10 for producing a provided with a three-dimensional surface structure fibrous web 12 (see also Fig. 7 ), which may in particular be a paper web and preferably a tissue or hygiene web.
  • the fibrous web 12 is pressed at a dry content ⁇ 35% by means of a first pressure pad I on a stamping or structural band 14, e.g. sucked, and thereby pre-embossed and then pressed for further drainage and drying by means of another pressure pad II a further time on the embossing belt 14 to fix the three-dimensional surface structure and strength.
  • a stamping or structural band 14 e.g. sucked, and thereby pre-embossed and then pressed for further drainage and drying by means of another pressure pad II a further time on the embossing belt 14 to fix the three-dimensional surface structure and strength.
  • another pressure pad II a further time on the embossing belt 14 to fix the three-dimensional surface structure and strength.
  • embossing belt 14 in particular an embossing screen.
  • the same embossing belt 14 is provided for embossing and fixing the surface structure.
  • the first pressure field I is produced by means of a suction element 16 arranged on the side of the embossing belt 14 facing away from the fibrous web 12, whereby the fibrous web 12 is sucked into the surface structure of the embossing belt 14.
  • the suction element 16 may be provided in particular as a suction box or wet vacuum.
  • the fibrous web 12 is preferably gently, ie in particular over a lengthened in the direction of web travel L distance pressed.
  • the further pressure field II can be generated in particular by means of a Preßnips 18, between a drying cylinder 20 and a counter-element 22 is formed.
  • the guided through the press nip 18 fibrous web 12 is in this case in contact with the surface 20 'of the drying cylinder 20. With its other side it lies against the embossing belt 14.
  • drying cylinder 20 may be provided in particular a Yankee cylinder.
  • a Schuhpreßaku 22 is provided which comprises a guided in the region of the press nips 18 via a press shoe 24 flexible belt 26.
  • Schuhpreßaku 22 provided with a flexible roll shell 26 shoe press roll.
  • a preferably soft band 28 (capillary fabric), in particular a soft felt or a soft foam felt, may be guided through the press nip 18. This soft band 28 thus runs between the embossing belt 14 and the flexible belt 26 of the shoe press unit 22.
  • the fibrous web 12 may be placed on the drying cylinder 20, i. For example, on a Yankee cylinder, dried.
  • the fibrous web 12 can be creped.
  • the web 12 can be wound up by appropriate means.
  • the dry content at which the fibrous web 12 is pre-stamped and / or the dry content at which the three-dimensional surface structure is fixed is as already mentioned, ⁇ 35%, and may in particular be ⁇ 30% and preferably ⁇ 25%.
  • a suctioned device 30 is provided, which may in particular be a suction roll.
  • the fibrous web 12 is guided together with the embossing belt 14 both via the evacuated device 30 and through the press nip 18.
  • the felt 28 is guided between the embossing belt 14 and the flexible belt 26 of the shoe press unit 22 through the press nip 18.
  • the felt 28 is guided not only by the Preßnip 18, but also on the evacuated device 30. Since the Saugwi kung of the device 30 is reduced by the resistance of the felt 28, the evacuated means 30 may be associated with an over-standing hood to support the vacuum effect of the evacuated device 30.
  • a suction device 32 for conditioning the felt 28, a suction device 32, in particular a suction box or the like, may be provided.
  • this felt conditioning device serving suction device 32 is disposed in front of the evacuated device 30, in the region of the felt 28 is merged with the embossing belt 14 carrying the fibrous web 12.
  • the suction device 32 is preferably arranged in front of (shown in solid lines) a lower deflection roller 72. In principle, however, an arrangement behind this lower guide roller 72 is possible (dashed line 32 ').
  • the embossing belt 14 In front of the evacuated device 30, the embossing belt 14 is guided over the suction element 16, which causes a pre-embossing of the fibrous web 12 in addition to a dry content increase. This is sucked into the three-dimensional surface structure of the embossing belt or sieve 14, whereby the structure of the web is impressed.
  • the in the Fig. 2 illustrated embodiment differs from that according to Fig. 1 essentially only in that the felt 28 is brought together after the suctioned egg n-direction 30 with the fibrous web 12 carrying embossing belt 14.
  • the evacuated device 30 is thus not wrapped in this case by the felt 28, whereby their suction effect is increased and the dry content is increased accordingly.
  • the wet embossing effect is maintained by the relatively gentle dewatering of the TissueFlex, where the pressure is lower than that of a conventional shoe press.
  • the suction device 32 is preferably arranged again before (representation in solid lines) of the lower deflection roller 72, wherein in principle, however, an arrangement behind this lower deflection roller 72 is again possible (dashed representation 32 ').
  • Fig. 3 shows a schematic partial representation of an embodiment in which a drainage device 34 is additionally provided, in which the capillary action of a felt 36 with foamed layer is used for dewatering.
  • the foam coating may in particular be selected so that pores in a range of about 3 to about 6 microns.
  • the foamed layer felt 36 together with an embossing belt 14 and intermediate fibrous web 12 is guided around a larger suction roll 38, the felt 36 preferably being in contact with the suction roll 38.
  • the suction roll 38 wrapped around the felt 36 may have a diameter of about 2 to about 3 meters.
  • the suction roller 38 may be acted upon by vacuum on its underside.
  • the suction roll 38 can also be assigned a siphon outlet.
  • the funds in question are in the Figure 3 denoted by "40".
  • At least one drainage sieve with zonal different sieve permeability can be provided.
  • a former with two circumferential dewatering belts 14, 42 is provided, the inner belt 14 also serving as an embossing belt.
  • the two dewatering belts 14, 42 converge to form a material inlet gap 44 and are guided over a shaping element 46 such as in particular a forming roller.
  • the embossing belt 14 is formed by the element 46 coming into contact with the inner band of the former.
  • the outer band 42 which does not come into contact with the forming element 46, can be provided in particular as a dewatering screen with zonal different screen permeability.
  • a headbox 48 By means of a headbox 48, the pulp suspension is introduced into the stock inlet gap 44. Behind the forming element 46, a pickup or separating element 50 is provided, through which the web is held on the embossing belt 14 during the separation from the dewatering belt 42. Preferably in front of the egg n-direction 34 with capillary action is again a suction element 16 (solid Representation) provided by the fibrous web 12 is pressed onto the embossing belt 14. However, this suction element can also be arranged between the device 34 with capillary action and the evacuated device or suction roller 30 (dashed representation 16 ').
  • a soft belt or felt 28 is again guided through the press nip 18 formed between a drying cylinder 20 and a shoe press unit 22.
  • the soft band is according to the embodiment according to Fig. 1 again guided around the evacuated device 30.
  • this soft band 28 may again be a capillary felt.
  • the felt 28 can be conditioned again via a suction device or a so-called UHLE box.
  • the drying cylinder 20 may in particular be a Yankee cylinder again. In this case, this drying cylinder 20 may be associated with a drying hood 52.
  • the dry content of the fibrous web before the capillary drainage device 34 is about 10 to about 25%, in the area downstream of this device 34 e.g. about 30 to about 40%.
  • the in the Fig. 4 illustrated embodiment differs from that according to Fig. 3 initially by the fact that the fibrous web 12 is taken over by the embossing belt 14 of an inner band 54 of the former.
  • this inner band 54 or the outer band 42 of the former can again be provided as a dewatering screen with zonal different Sieb trim engineer.
  • the two circulating dewatering belts 42, 54 converge again to form a material inlet gap 44, wherein they are guided again over a forming element 46 such as in particular a forming roller.
  • a headbox 48 of the material inlet gap 44 is again with pulp suspension fed.
  • the pulp suspension is supplied in the present case from below.
  • a pickup or separating element is again provided, through which the fibrous web 12 is held on the embossing belt during the separation from the inner band 54 of the former.
  • suction member 16 is arranged in front of the dewatering device 34 with capillary action, in principle, however, an arrangement according to this device 34 is possible.
  • the felt 28 is missing.
  • the dry content of the fibrous web in the present embodiment is about 10 to about 25% in the region of the pickup element 50, about 15 to about 30% in the region upstream of the dewatering device 34 and about 35 to about 45% downstream of the device 34.
  • this embodiment may have at least substantially the same structure as that according to Fig. 3 , Corresponding elements are assigned the same reference numerals.
  • Fig. 5 shows a schematic partial view of an embodiment of the device 10, in which a displacement press 56 is provided.
  • the fibrous web 12 is guided to expel water by means of gas pressure with the embossing belt 14 at least once through a pressure chamber 58 which is bounded by at least four parallel rollers 60 - 66 and in which a compressed gas can be introduced.
  • the fibrous web 12 is preferably guided together with the embossing belt 14 and a membrane 68 through the pressure chamber 58.
  • the membrane 68 forms the inner band of the former, which again comprises a forming member 46, in particular a forming roller, in the region of which provided as a membrane inner band 48 and the outer band 42 converge to form a Stoffeinlaufspaltes 44 which feeds by means of a headbox 48 with pulp suspension becomes.
  • the fibrous web 12 together with the embossing belt 14 again via an evacuated device 30, in particular a suction roll, and passed through the formed between a drying cylinder 20, in particular Yankee cylinder, and a shoe press 22 Preßnip 18.
  • the drying cylinder or Yankee cylinder 20 is again associated with a drying hood 52.
  • the first pressure field I by which the fibrous web 12 is pressed at a dry content of ⁇ 50% on the embossing belt 14 and pre-embossed, for example, be generated by the air press 56.
  • the area fraction of raised or closed zones 68 can be in particular ⁇ 40% and preferably in a range of about 25 to about 30%.
  • the raised zones 68 and the recessed zones may result, for example, by offsets, ie by intersections of weft and warp threads, of a mesh fabric.
  • Preßmembran results in a corresponding structuring through the holes 74th
  • Fig. 6 shows a schematic partial view of a corresponding embossing belt 14, for example, embossing felt or embossing membrane, with a smaller compared to the area ratio of recessed zones or holes 74 surface portion of raised or closed areas 68th
  • the thickness d of the right part of the Fig. 6 may be about 1 to about 3 mm.
  • the open area may be greater than 50%, and more preferably greater than 60%, and preferably within a range of from about 70% to about 75%.
  • the membrane expediently i-wise of a resistant to the pulp chemistry material. It can for example consist of polyester.
  • Fig. 7 shows a schematic section through a Preßnip 18, through which in the Fig. 6 shown embossing belt 14 is passed together with the fibrous web 12 and a preferably soft belt or felt 28.
  • this soft band 28 is in contact with the flexible band 26 of the shoe press unit, which is guided in the region of the press nips 18 via a press shoe 24, via which the desired contact pressure can be applied.
  • the fibrous web 12 is applied to the drying cylinder 20, preferably a Yankee cylinder.
  • the fibrous web 12 is already marked before the nip. As based on the Fig. 7 can be seen, is already on the embossing belt before the nip.

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  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (39)

  1. Procédé pour produire une bande de matière fibreuse (12) pourvue d'une structure superficielle tridimensionnelle, en particulier d'une bande de papier essuie-tout ou hygiénique, dans lequel on presse la bande de matière fibreuse (12) sur une bande de gaufrage (14) au moyen d'un premier champ de pression (I) pour un degré de siccité < 35 % et on forme ainsi un gaufrage préliminaire, et on la presse ensuite une nouvelle fois sur une bande de gaufrage (14) au moyen d'un autre champ de pression (II) pour un essorage et un séchage supplémentaires, afin de fixer la structure superficielle tridimensionnelle et la résistance, caractérisé en ce que l'on utilise pour l'essorage de la bande au moins un entoilage finement poreux (36) à effet capillaire, qui est un entoilage (36) avec une couche de mousse, dans lequel on guide l'entoilage (36) avec une couche de mousse en même temps qu'une bande de gaufrage (14) et la bande de matière fibreuse (12) placée entre celles-ci autour d'au moins un rouleau aspirant (38) et l'entoilage (36) est en contact avec le rouleau aspirant (38).
  2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise comme bande de gaufrage une toile de gaufrage (14).
  3. Procédé selon la revendication 1, caractérisé en ce que l'on utilise comme bande de gaufrage une membrane de gaufrage.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de matière fibreuse (12) est pourvue du gaufrage préliminaire après la zone de formage.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de matière fibreuse (12) est formée sur la bande de gaufrage (14) utilisée pour le gaufrage.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de matière fibreuse (12) est transférée sur la bande de gaufrage (14) utilisée pour le gaufrage préliminaire.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on utilise la même bande de gaufrage (14) pour le gaufrage préliminaire et pour la fixation de la structure superficielle.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on produit au moins le premier champ de pression (I) au moyen d'un élément aspirant (16, 16') disposé sur la face de la bande de gaufrage (14) située à l'opposé de la bande de matière fibreuse (12), afin d'aspirer la bande de matière fibreuse (12) dans la structure superficielle de la bande de gaufrage (14).
  9. Procédé selon la revendication 8, caractérisé en ce que l'on utilise un suceur humide comme élément aspirant.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on presse la bande de matière fibreuse (12) dans l'autre champ de pression (II) de façon douce, c'est-à-dire sur une section allongée dans la direction de défilement de la bande (L).
  11. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on produit l'autre champ de pression (II) au moyen d'une fente de pressage (18).
  12. Procédé selon la revendication 11, caractérisé en ce que l'on produit la fente de pressage (18) formant l'autre champ de pression (II) entre un cylindre de séchage (20) et un élément d'appui (22), dans lequel la bande de matière fibreuse (12) guidée à travers la fente de pressage (18) est en contact avec la surface du cylindre de séchage (20) et est appliquée par son autre face sur la bande de gaufrage (14).
  13. Procédé selon la revendication 12, caractérisé en ce que l'on utilise comme cylindre de séchage un cylindre frictionneur (20).
  14. Procédé selon la revendication 12 ou 13, caractérisé en ce que l'on utilise comme élément d'appui coopérant avec le cylindre de séchage (20) une unité de presse à sabot (22), qui comprend une bande flexible (26) guidée sur un sabot de presse (24) dans la région de la fente de pressage (18).
  15. Procédé selon la revendication 14, caractérisé en ce que l'on utilise comme unité de presse à sabot un rouleau de presse à sabot pourvu d'une enveloppe latérale flexible.
  16. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on guide à travers la fente de pressage (18) formant l'autre champ de pression (II) une bande (28) de préférence souple, notamment un feutre (28), prévue à l'intérieur de la boucle de la bande de gaufrage (14).
  17. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on sèche la bande de matière fibreuse prégaufrée (12) sur le cylindre de séchage (20), en ce l'on crêpe la bande de matière fibreuse (12) et/ou en ce que l'on enroule ensuite la bande de matière fibreuse (12).
  18. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on choisit le degré de siccité, auquel la bande de matière fibreuse (12) est prégaufrée, et/ou le degré de siccité auquel la structure superficielle tridimensionnelle est fixée, chaque fois < 35 %, en particulier < 30 % et de préférence < 25 %.
  19. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on utilise un système aspirant entre l'élément aspirant (16, 16') formant le premier champ de pression (I) et la fente de pressage (18) formant le deuxième champ de pression (II), et en ce que l'on guide la bande de matière fibreuse (12) en même temps qu'une bande de gaufrage (14) aussi bien sur le système aspirant (30) qu'à travers la fente de pressage (18).
  20. Procédé selon la revendication 19, caractérisé en ce que le système aspirant (30) possède une face courbe et on guide la bande de matière fibreuse (12) et la bande de gaufrage (14) sur cette face courbe.
  21. Procédé selon la revendication 20, caractérisé en ce que l'on utilise comme système aspirant (30) un rouleau aspirant (30).
  22. Procédé selon l'une quelconque des revendications 16 à 21, caractérisé en ce que l'on guide à travers la fente de pressage (18) le feutre (28) placé entre la bande de gaufrage (14) et la bande flexible (26) de l'unité de presse à sabot (22).
  23. Procédé selon l'une quelconque des revendications 16 à 22, caractérisé en ce que l'on guide également le feutre (28) sur le système aspirant (30).
  24. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une hotte placée en surpression est associée au système aspirant (30), afin de renforcer l'effet de dépression du système aspirant (30).
  25. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on conditionne le feutre (28) au moyen d'un système aspirant (32), en particulier au moyen d'un caisson aspirant, avant de le réunir à la bande de gaufrage (14) portant la bande de matière fibreuse (12).
  26. Procédé selon l'une quelconque des revendications 16 à 25, caractérisé en ce que l'on ne réunit le feutre (28) avec la bande de gaufrage (14) portant la bande de matière fibreuse (12) qu'après le système aspirant (30).
  27. Procédé selon l'une quelconque des revendications 14 à 26, caractérisé en ce que l'on choisit une longueur de la fente de pressage (18), considérée dans la direction de défilement de la bande (L), de la presse à sabot comprenant le cylindre de séchage (20) et l'unité de presse à sabot (22), plus grande qu'une valeur d'environ 80 mm et on conçoit la presse à sabot de telle manière qu'il s'établisse sur la longueur de la fente de pressage un profil de pression avec une pression maximale qui est inférieure ou égale à une valeur d'environ 2,5 MPa.
  28. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on utilise dans la section de formage au moins une toile d'essorage (42, 54) présentant une perméabilité différente par zones.
  29. Procédé selon la revendication 28, caractérisé en ce que l'on utilise un dispositif de formage avec deux bandes d'essorage continues (14, 42, 54), qui se rejoignent en formant une fente d'entrée de matières (44) et qui sont guidées sur un élément de formage comme notamment un rouleau de formage (46), et en ce que l'on utilise, comme bande extérieure (42) et/ou comme bande intérieure (14) ne venant pas en contact avec l'élément de formage (46), une toile d'essorage présentant une perméabilité différente par zones.
  30. Procédé selon la revendication 29, caractérisé en ce que l'on utilise comme bande intérieure une bande de gaufrage (14) et de préférence comme bande extérieure (42) une toile d'essorage présentant une perméabilité différente par zones.
  31. Procédé selon la revendication 30, caractérisé en ce que la bande de matière fibreuse (12) est reprise de préférence de la bande intérieure (54) par une bande de gaufrage (14).
  32. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on guide à travers la fente de pressage (18) une bande de gaufrage (14), par exemple une toile de gaufrage ou une membrane de gaufrage, qui est structurée de telle manière qu'il en résulte, pour cette bande de gaufrage (14), une portion superficielle de zones en saillie ou fermées plus petite que la portion superficielle de zones en creux ou de trous et que, par conséquent, une plus petite portion superficielle de la bande de matière fibreuse (12) soit pressée dans la fente de pressage (18).
  33. Procédé selon la revendication 32, caractérisé en ce que l'on utilise une bande de gaufrage (14), dans laquelle la portion superficielle de zones en saillie ou fermées est ≤ 40 % et se situe de préférence dans une plage d'environ 25 % à environ 30 %.
  34. Procédé selon la revendication 32 ou 33, caractérisé en ce que l'on utilise une bande de gaufrage (14), dans laquelle les zones en saillie et les zones en creux sont produites par des coudes, c'est-à-dire par des points de croisement entre des fils de trame et des fils de chaîne, d'une toile tissée.
  35. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'entoilage finement poreux avec une couche de mousse (36) est un feutre avec une couche de mousse.
  36. Procédé selon la revendication 35, caractérisé en ce que l'on choisit le revêtement de mousse de telle manière qu'il se forme des pores de l'ordre d'environ 3 à environ 6 µm.
  37. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'entoilage avec une couche de mousse (36) entoure un rouleau aspirant (38) ayant un diamètre d'environ 2 à environ 3 m ou plusieurs rouleaux aspirants de plus petit diamètre, de préférence deux rouleaux aspirants ayant par exemple chacun un diamètre d'environ 2 m.
  38. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le rouleau aspirant (38) est exposé au vide sur son côté inférieur.
  39. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on utilise un rouleau aspirant avec un soutirage associé par siphon ou l'eau est expulsée dans une goulotte par la force centrifuge.
EP05109471A 2001-06-20 2002-05-27 Procédé et dispositif pour produire une bande de matière fibreuse pourvue d'une structure superficielle tridimensionelle Expired - Lifetime EP1626122B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10129613A DE10129613A1 (de) 2001-06-20 2001-06-20 Verfahren und Vorrichtung zur Herstellung einer mit einer dreidimensionalen Oberflächenstruktur versehenen Faserstoffbahn
EP02758205A EP1397587B1 (fr) 2001-06-20 2002-05-27 Procede et dispositif pour produire une bande de matiere fibreuse pourvue d'une structure superficielle tridimensionnelle

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EP02758205.5 Division 2002-05-27

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EP05109470A Withdrawn EP1626121A1 (fr) 2001-06-20 2002-05-27 Procédé et dispositif pour produire une bande de matière fibreuse pourvue d'une structure superficielle tridimensionelle
EP05109471A Expired - Lifetime EP1626122B1 (fr) 2001-06-20 2002-05-27 Procédé et dispositif pour produire une bande de matière fibreuse pourvue d'une structure superficielle tridimensionelle

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EP05109470A Withdrawn EP1626121A1 (fr) 2001-06-20 2002-05-27 Procédé et dispositif pour produire une bande de matière fibreuse pourvue d'une structure superficielle tridimensionelle

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US (2) US7291249B2 (fr)
EP (3) EP1397587B1 (fr)
AT (2) ATE474085T1 (fr)
BR (1) BR0211023A (fr)
DE (3) DE10129613A1 (fr)
WO (1) WO2003000002A1 (fr)

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DE50214542D1 (de) 2010-08-26
EP1626121A1 (fr) 2006-02-15
DE50205800D1 (de) 2006-04-20
ATE317498T1 (de) 2006-02-15
US7291249B2 (en) 2007-11-06
EP1626122A1 (fr) 2006-02-15
EP1397587A1 (fr) 2004-03-17
US20040237210A1 (en) 2004-12-02
ATE474085T1 (de) 2010-07-15
BR0211023A (pt) 2004-07-13
DE10129613A1 (de) 2003-01-02
WO2003000002A1 (fr) 2003-01-03
US7662260B2 (en) 2010-02-16
US20070289159A1 (en) 2007-12-20
EP1397587B1 (fr) 2006-02-08

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