EP1075566B1 - Machine a papier, bande pour machine a papier et procede de fabrication de papier doux texture - Google Patents

Machine a papier, bande pour machine a papier et procede de fabrication de papier doux texture Download PDF

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Publication number
EP1075566B1
EP1075566B1 EP98963730A EP98963730A EP1075566B1 EP 1075566 B1 EP1075566 B1 EP 1075566B1 EP 98963730 A EP98963730 A EP 98963730A EP 98963730 A EP98963730 A EP 98963730A EP 1075566 B1 EP1075566 B1 EP 1075566B1
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EP
European Patent Office
Prior art keywords
press
belt
web
fibrous web
drying cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98963730A
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German (de)
English (en)
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EP1075566A1 (fr
Inventor
Ingvar B. E. Klerelid
Anders T. Linden
Robert S. Ampulski
Ward W. Ostendorf
Osman Polat
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Valmet AB
Original Assignee
Metso Paper Karlstad AB
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Publication date
Priority claimed from US08/992,285 external-priority patent/US5972813A/en
Application filed by Metso Paper Karlstad AB filed Critical Metso Paper Karlstad AB
Priority to EP07010861.8A priority Critical patent/EP1832679B1/fr
Publication of EP1075566A1 publication Critical patent/EP1075566A1/fr
Application granted granted Critical
Publication of EP1075566B1 publication Critical patent/EP1075566B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F11/006—Making patterned paper

Definitions

  • the present invention relates to papermaking machines and methods of making paper, and more particularly relates to machines and methods for making textured soft paper, such as tissue.
  • a paper machine for the production of tissue paper is disclosed in U.S. Patent No. 5,393,384 , see particularly Figure 6.
  • the paper machine shown therein has a belt impermeable to water, which runs in a loop through an extended press nip formed by a shoe press roll and a counter roll.
  • a press felt is conveyed directly to the press nip, where it is brought together with the impermeable belt and the paper web.
  • the paper web is transferred from a forming fabric to the impermeable belt which is to carry the paper web on its under side up to the press nip and thence to the drying cylinder.
  • the impermeable belt thus carries the paper web a relatively long distance after the paper web has been transferred from the forming fabric to the impermeable belt.
  • the adhesion force between the impermeable belt and the paper web is greater than that between the press felt and the paper web.
  • the impermeable belt under discussion here is not compressible and has a smooth, web-carrying surface.
  • DE-195 48 747 discloses a paper machine for manufacturing creped tissue paper which is provided with a press comprising a shoe press roll, a counter roll and a suction roll, the counter roll forming a first press nip with the suction roll and a second extended press nip with the shoe press roll.
  • a felt passes through the two press nips together with the paper web and then carries the paper web with it to a Yankee dryer, to which the paper web is transferred when the felt and the paper web pass around a transfer roll forming a non-compressing nip with the Yankee dryer.
  • Suction zones are provided before and after the first press nip, the suction zone before the press nip being situated within the suction roll whereas the suction zone after the press nip is in a side loop in which the felt runs alone and joins the paper web again at the entry to the second press nip.
  • One drawback with such a paper machine is that the paper web is exposed to re-wetting by the wet felt before it reaches the Yankee dryer.
  • the paper machine has no impermeable belt, nor does the patent specification mention anything about texturing the paper web.
  • U.S. Patent No. 5,298,124 discloses a compressible transfer belt for use in a paper or board making machine in order to eliminate open draws in the paper web and to easily release the paper web so that it can be transferred to a fabric or belt.
  • the transfer belt carries the paper web through the press section, which comprises one or more press nips, and on to the drying section which comprises a plurality of drying cylinders and a belt passing in a loop around a transfer roll which forms a nip with the transfer belt.
  • Each press is also provided with a felt passing through its press nip and enclosing the paper web between it and the transfer belt.
  • the impermeable transfer belt is also so designed that a liquid film formed in a press nip between the transfer belt and the paper web breaks up when the pressure on the transfer belt ceases after the press nip so that its release properties increase and the paper web can thus more easily be transferred to a fabric or another belt running in a loop.
  • U.S. Patent No. 5,298,124 offers an excellent description of the tasks a transfer belt cooperating with a press felt shall perform in a satisfactory manner, and also of the properties and design of such transfer belts which then were disclosed in patent specifications U.S. Patent Nos. 4,483,745 , 4,976,821 , 4,500,588 , 5,002,638 , 4,529,643 and CA-A-1,188,556 . According to U.S. Patent No.
  • the critical tasks are a) to remove the paper web from the press felt without causing instability problems; b) to cooperate with the press felt in one or more press nips to ensure optimal dewatering and high quality of the paper web, and c) to transfer the paper web in a closed draw from a press in the press section to a paper web receiving fabric or belt in the following press or presses of the press section or to a pick-up fabric in the drying section.
  • the transfer belt for the press section of a paper machine disclosed in U.S. Patent No. 5,298,124 has a web-contacting surface which is substantially impermeable to water and air and has a pressure-responsive microscale topography. Under influence of the pressure in a press nip in the press section, the transfer belt is compressed so that the microscale roughness of said surface is decreased, whereupon the surface becomes much smoother and allows the formation of a thin, continuous film of water thereon.
  • Paper machines for manufacturing soft paper with high bulk are known through a plurality of patent specifications.
  • An imprinting fabric or felt is generally used which passes, together with the paper web formed, through a press nip in which the paper web is pressed into the imprinting fabric, thus acquiring a texture pattern on one side.
  • Paper machines having such texturing fabrics and press nips are disclosed in U.S. Patent Nos. 3,301,746 , 3,537,954 , 4,309,246 , 4,533,437 , 5,569,358 , 5,591,305 and WO 91/16493 .
  • the drawback with the paper machines disclosed in these publications is that dewatering in the press nip is relatively low and the dry solids content of the paper web is therefore low when the paper is transferred to the drying cylinder. The production rate of the paper machine is thus relatively low.
  • U.S. Patent No. 4,849,054 discloses a machine for manufacturing an imprinted fabric web with high bulk without the use of a press nip.
  • a roll e.g. , a transfer roll or felt-carrying roll, forms a nip with an imprinting fabric at a transfer point for the web where the imprinting fabric passes around a suction tube with a slit opening facing the transfer point.
  • the nip is so wide that the web is not compressed when it passes through.
  • the suction effect from the suction tube via the narrow slit opening is sufficient to ensure that the web is not only transferred to the imprinting belt but is also shaped in compliance with the surface of the imprinting belt facing the web, this belt having a three-dimensional pattern.
  • the speed of the fabric web Prior to the transfer point the speed of the fabric web is greater than that of the imprinting fabric.
  • the roll carrying the web to the non-compressing nip has a smooth surface and it is generally known that in practice considerable problems are entailed in transferring a fabric web from a smooth surface to a fabric, which fabric web has been pre-pressed to a dry solids content of 30-50%.
  • U.S. Patent No. 5,411,636 discloses manufacture of soft paper where the paper web is formed on a forming fabric, pre-pressed in a double-felted press nip and transferred to a coarse-meshed fabric.
  • the paper web is carried by the coarse-meshed fabric it is subjected to a vacuum in a suction zone so that the paper web is sucked into the openings and depressions in the fabric and thereby acquires increased thickness and thus increased bulk.
  • the coarse-meshed fabric then carries the paper web to the drying cylinder.
  • the double-felted press nip ensures that the dry solids content of the paper web is relatively low, i.e. , 25-30%.
  • an improved paper machine and method of manufacturing textured soft paper would enable the manufacture of a textured fibrous web with high bulk and high dry solids content before the drying cylinder to enable a high production rate to be achieved at a reasonable cost. Further, it would be desirable to reliably transfer the textured fibrous web to the drying cylinder although the fibrous web is carried to the drying cylinder by an impermeable texturing belt.
  • impermeability or substantial impermeability is an extremely favorable property in a texturing belt, that is included in the paper machine according to the invention if the impermeable texturing belt is also used to transport a pressed paper web to the transfer nip at a Yankee dryer in the drying section of the paper machine.
  • the property allows steam which, as a result of heating the Yankee dryer is formed in the depressions or pits in the texturing pattern by the water present in the pits or depressions, to be pressurized, thus pressing the paper fibers also present in the pits or depressions as a result of the press effect in the press section, so that these in the Yankee dryer nip are pressed into the pits or depressions at the same time as the parts of the paper fiber web present between the raised parts of the texturing pattern and the Yankee dryer become thinner.
  • the desired texturing effect and high bulk of the paper web is thus achieved.
  • the texturing effect and the productivity can be increased if the texturing belt or a layer of the texturing belt intended for contact with the paper web is also given the feature of reversible compressibility so that the texturing belt is compressed in the transfer nip at the Yankee dryer.
  • a vacuum is created, which contributes to the formation of steam, which in turn facilitates separation of the texturing belt and paper web after the transfer nip and also quicker drying of the paper web on the Yankee dryer, i.e. , higher paper production capacity.
  • the vacuum-forming effect increases the quicker the belt resumes its uncompressed state, i.e. , the more resilient the reversible compressibility is.
  • the texturing effect of the texturing belt that is included in the paper machine according to the invention is, of course, selected taking into consideration the desired texture pattern in the paper to be manufactured.
  • the texture pattern is regular across the texturing belt or, if the texture pattern in the paper web is to include a particularly prominent additional pattern, e.g. , a picture, logotype, etc., it has a regular basic pattern of depressions or pits and raised portions, onto which pattern the additional pattern is superimposed.
  • Regular does not necessarily imply that the pattern appears regularly in all directions of the texturing belt.
  • the paper is soft paper that is to be creped
  • a tighter dominant transverse pattern (across the machine direction) as compared with a longitudinal pattern of elevations and pits, will give an increased creping effect.
  • the pattern can be used for altering the properties of the paper in a desired direction.
  • the texturing pattern can be achieved in some manner, known per se, such as etching, calendering, laser processing or embossing.
  • the density of the texturing pattern can also be used to influence the effect of the drying of the paper web on the Yankee dryer. Fewer contact points between the Yankee dryer and the paper web thus results in reduced drying effect from the Yankee dryer but increased drying effect from the hot air hood around the Yankee dryer on the fluffier parts of the paper web located between the thinner contact points.
  • FIGS 1-3 show schematically parts of paper machines for manufacturing a textured web 1 of soft paper, such as tissue and other paper products with low density.
  • Each of the paper machines comprises a wet section 2, a press section 3 and a drying section 4.
  • the wet section 2 includes a headbox 7 a forming roll 8, an endless, carrying, inner clothing 9 and an endless, covering outer clothing 10 consisting of a forming fabric.
  • the inner and outer clothings 9, 10 run, each in its own loop, around a plurality of guide rolls 11 and 12, respectively.
  • the drying section 4 includes a drying cylinder 5 covered by a hood 30.
  • the drying cylinder is suitably a Yankee dryer.
  • a creping doctor is arranged to crepe the fibrous web 1 off the Yankee dryer.
  • An application device 31 is also provided for applying a suitable adhesive on the envelope surface of the Yankee dryer 5 immediately before the transfer nip.
  • the press section 3 includes a shoe press with a shoe press roll 14 and a counter roll 19, these rolls 14 and 19 forming an extended press nip with each other.
  • the press section also has an endless press felt 15 which runs in a loop around guide rolls 6, and an endless, substantially impermeable belt 16 , which according to the invention is a texturing belt.
  • the substantially impermeable texturing belt 16 runs in a loop around the counter roll 19, a transfer roll 17 and a plurality of guide rolls 18.
  • the transfer roll 17 forms a transfer nip with the Yankee dryer 5 with low linear load, i.e. , about 30 to 60 kN (kiloNewtons), through which transfer nip the substantially impermeable texturing belt 16 thus passes.
  • the press section 3 also includes a roll press, constituted by a suction press roll 13 and said counter roll 19 to form a press nip, through which the substantially impermeable texturing belt 16 and the press felt 15 pass together with the fibrous web 1.
  • the press felt 15 is conducted away from the fibrous web 1 and the substantially impermeable texturing belt 16 in a side loop around the suction press roll 13 and two guide rolls 32.
  • the press felt 15 rejoins the fibrous web and the substantially impermeable texturing belt 16 immediately before the extended press nip.
  • suction devices may be arranged within this side loop of the press felt 15 in order to increase the capacity of the press felt to absorb water at the entrance to the extended press nip.
  • the inner clothing 9 of the wet section 2 is a felt guided to the press section 3 to be also utilized as press felt 15, and which thus runs in a loop back to the forming roll 8.
  • the inner clothing 9 of the wet section 2 is a forming fabric, the press felt running around a pick-up roll 20 arranged close to the loop of fabric 9, so that press felt 15 and fabric 9 run in contact with each other to transfer the fibrous web from the fabric 9 to the press felt 15.
  • the pick-up roll 20 may be provided with a suction shoe (not shown). Alternatively, the pick-up roll with suction shoe may be replaced by a pick-up suction box.
  • Figure 4 shows schematically parts of a paper machine according to another embodiment of the invention. It is similar to that shown in Figure 1 with the exception that the press felt 15 is not led in a side loop between the two press nips, but instead accompanies the counter roll 19, so that the fibrous web 1 is held enclosed between the substantially impermeable texturing belt 16 and the press felt 15 .
  • This embodiment can be used when there is little risk of rewetting of the fibrous web.
  • FIG. 5 shows schematically parts of a paper machine according to yet another embodiment of the invention for manufacturing a textured web of soft paper, such as tissue and other sanitary paper products.
  • the paper machine comprises a wet section 2, a press section 3 and a drying section 4.
  • the wet section 2 includes a headbox 7, a forming roll 8, an endless, carrying inner clothing 9 and an endless, covering, outer clothing 10 constituted by a forming fabric.
  • the inner and outer clothings 9 and 10 run in individual loops around a plurality of guide rolls 11 and 12, respectively.
  • the drying section 4 includes a drying cylinder 5 covered by a hood 30.
  • the drying cylinder is suitably a Yankee dryer.
  • a creping doctor 21 is provided to crepe the fibrous web off the Yankee dryer 5.
  • An application device 31 is also provided for applying a suitable adhesive on the envelope surface of the Yankee dryer 5 immediately before the transfer nip.
  • the press section 3 includes a shoe press with a shoe press roll 14 and a counter roll 19, these rolls 14 and 19 forming an extended press nip with each other.
  • the press section also has an endless press felt 15 which runs in a loop around guide rolls 6, and an endless, substantially impermeable belt 16, which according to the invention is a texturing belt.
  • the substantially impermeable texturing belt 16 runs in a loop around the counter roll 19, a transfer roll 17 and a plurality of guide rolls 18.
  • the transfer roll 17 forms a transfer nip with the Yankee dryer 5 with low linear load, through which transfer nip the substantially impermeable texturing belt 16 thus passes.
  • the substantially impermeable texturing belt 16 is also used as the inner clothing 9 in the wet section 2, its loop being extended to the forming roll 8.
  • the substantially impermeable texturing belt 16 thus runs in a loop between the wet section 2 and the drying section, around the transfer roll 17, guide rolls 18 and 11 and forming roll 8.
  • the substantially impermeable texturing belt carries the fibrous web on its under side from the forming roll to the drying cylinder.
  • the counter roll 19 is a smooth roll and is arranged in a loop of the substantially impermeable texturing belt 16.
  • the positions of the rolls 14 and 19 are reversed, i.e. , the shoe press roll 14 is arranged in the loop of the substantially impermeable texturing belt 16, and the counter roll is in the loop of the press felt 15.
  • the counter roll may be a suction roll, a grooved roll or a blind-drilled roll.
  • the substantially impermeable texturing belt used in the embodiments above of the paper machine according to the invention comprises a back layer 33 and a web-contacting layer 34 having a multitude of uniformly distributed depressions 35 with flat or arched surface portions 36 situated therebetween, see Figures 6 to 9.
  • the substantially impermeable texturing belt 16 consists of a tight layer 33 forming said back layer and a fabric forming said web-contacting layer 34.
  • the fabric 34 is coated with a polymer enclosing the threads of the fabric without altering the structure of the fabric, which is formed of depressions and arched or convex surface portions 36 situated between the depressions.
  • the depressions 35 and surface portions 36 are in turn formed by the threads of the fabric extending in the machine direction (as indicated by the arrow) and transverse to this.
  • the depressions 35 are sealed by the tight back layer 33 formed by coating polymer on the surface of the fabric not coming in contact with the web.
  • Said arched surface portions 36 comprise both oblong arc-shaped ridges 36a of the longitudinally running fabric threads, and also knuckles 36b of the transversely running threads, which knuckles produce small bowl-shaped pits in the fibrous web in the texturing phase.
  • the substantially impermeable texturing belt has 100 knuckles 36b per cm 2 .
  • the fabric may have 25 to 150 knuckles/cm 2 , preferably 50 to 100 knuckles/cm 2 .
  • This structure of depressions, ridges and knuckles produces a corresponding texture pattern in the fibrous web when it runs through the extended press nip together with the texturing belt 16 and press felt 15.
  • the polymer coating on the fabric ensures that the fibrous web is reliably adhered to the substantially impermeable texturing belt as it runs out from the extended press nip. This ensures that the fibrous web accompanies the substantially impermeable texturing belt 16 and not the press felt 15.
  • the structure of the web-contacting layer of the impermeable texturing belt, i.e. , the polymer-coated fabric 34, combined with the envelope surface of the drying cylinder 5 being coated with a continuous adhesive layer, also ensures that the fibrous web is safely transferred to the drying cylinder 5 when it passes through and out of the transfer nip.
  • the back layer which is substantially impermeable, may consist of a suitable polymer resin material, e.g. , the polymers described below for the polymer layer in the second embodiment of the substantially impermeable texturing belt.
  • the polymer for coating the fabric threads may be selected in the same way.
  • the R z -value is more specifically the ten-point height, which is defined in said ISO norm as the average distance between the five highest peaks and the five deepest valleys in the reference length measured from a line parallel to the mid-line and not crossing the surface profile.
  • the substantially impermeable texturing belt preferably has an air permeability of less than 6 m 3 /m 2 /minute, measured in accordance with the procedure described in "Standard Test Method for Air Permeability of Textile Fabrics, ASTM D 737-75, American Society of Testing and Materials".
  • the substantially impermeable texturing belt 16 is thus compressible under the influence of the pressure forces prevailing in the extended press nip.
  • the substantially impermeable texturing belt 16 therefore assumes an uncompressed state upstream and downstream of the extended press nip, the surface, the web-carrying surface facing the fibrous web, having a high degree of roughness in the uncompressed state of the substantially impermeable texturing belt and a lower degree of roughness in the compressed state of the substantially impermeable texturing belt, so that the web-carrying surface in the compressed state of the substantially impermeable texturing belt is sufficiently smooth for a continuous liquid film to be formed on the web-carrying surface, when the substantially impermeable texturing belt, together with press felt 15 and fibrous web 1, passes through the extended press nip, and so that the web-carrying surface in the uncompressed state of the substantially impermeable texturing belt is sufficiently rough to permit the continuous liquid film to be broken up after the substantially impermeable texturing belt has expanded
  • the compressible polymer layer 34 is provided with said multitude of uniformly distributed depressions 35, in order to take up a large share of the web-contacting surface, viz. from 20% up to 50%.
  • the depressions can be formed in many ways to achieve the desired effect of texturing a relief pattern in the fibrous web in order to increase its bulk.
  • the depressions may consist of continuous grooves in the polymer layer 33, see Figure 7, which extend in machine direction. According to another embodiment, the grooves extend diagonally from one edge to the other, forming an angle of 10° to 80° to the machine direction.
  • the depressions consist of diagonally intersecting grooves which extend in one group from the first edge to the second edge, and in a second group from the second edge to the first edge, intersecting grooves forming an angle ⁇ of 10° to 170°.
  • the grooves in the various embodiments may be straight, as shown, or wave shaped or the like, e.g. , sinus shaped or zigzag shaped.
  • the distance a between two grooves 35 running in the same direction may be within the interval 1 to 3 mm.
  • the width b of the groove is within the interval 0.5 to 1.0 mm and its depth c within the interval 0.1 to 1.0 mm.
  • the depressions comprise hollows of the same or similar shapes.
  • These hollows may be circular, elliptical or polygon in shape, e.g. , triangular, rectangular or hexagonal, the largest dimension lying within the interval 0.5 to 3.0 mm and the depth within the interval 0.5 to 1.0 mm.
  • All or some of the depressions may be constituted by hollows of special symbol shapes, e.g. , numbers, letters, trade or company symbols repeated at regular intervals within a length unit of the belt.
  • the substantially impermeable texturing belt according to said second embodiment may be built up in accordance with the recipes described in U.S. Patent No. 5,298,124 , discussed in the introduction.
  • the polymer coating 34 comprises a polymer composition such as acrylic polymer resin, polyurethane polymer resin and polyurethane/polycarbonate resin composition.
  • the polymer coating also contains particles of a filler, which have a different hardness from the polymer material and may consist of kaolin, clay, polymer material or metal, preferably stainless steel.
  • the carrier constituting the back layer 33 includes all types of base elements that can in some way be made endless. The term also covers base elements provided with seams.
  • the carrier may consist, for instance, of a single-layered or multi-layered fabric produced from monofilaments such as polyester, polyamide, and the like.
  • the base element may even consist of a fiber web (non-woven) held together by adhesive, combined wound yarns, polymer foil/film, warp knitting, or the like.
  • the carrier may be coated on the rear side with a polymer material of the same type as that used for the polymer layer 34.
  • the compressibility of the transfer belt used in the paper machine according to the invention results in lower specific pressure at the adhesion point, which in turn offers increased rate of operation, i.e. , higher production rate. This property also results in increased vaporization of water from the soft paper web, i.e. , quicker drying of the soft paper web on the Yankee dryer, which also contributes to higher production rates.
  • the paper machine according to the invention produces a textured fibrous web with a high dry solids content before the drying section, viz. up to 55%, which should be compared with the dry solids contents of up to 45% achieved with paper machines in practical use today.
  • This improvement can be utilized either to run the paper machine at a higher production rate or to reduce the energy consumption in the drying section. It is also then possible to reduce the diameter of the drying cylinder.
  • a guide roll may be arranged, if desired, in the loop of the substantially impermeable texturing belt 16 immediately before the transfer roll 17.
  • a transfer member is used constituted by the transfer roll 17 .
  • the transfer roll is replaced by the substantially impermeable texturing belt itself, which is allowed to run around a predetermined part of the drying cylinder, e.g. , within a sector angle of 30° to 60°, to form an extended transfer nip with the drying cylinder.
  • the invention is also applicable when the press section lacks a shoe press and instead has at least one press with two press rolls, of which the press roll around which the press felt runs is a suction roll, a grooved roll or a blind-drilled roll.

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Claims (28)

  1. Courroie de machine à papier destinée à faire avancer une bande de papier fibreuse humide (1) entre une presse (14, 19) et un cylindre de séchage chauffé (5) d'une machine à papier, la courroie (16) étant une courroie sensiblement imperméable qui a une surface de contact avec la bande et qui est adaptée pour passer avec la bande fibreuse (1) à travers la presse (14,19) et ensuite transporter la bande fibreuse (1) jusqu'au cylindre de séchage (5),
    caractérisé en ce que
    ladite surface de contact avec la bande définit une multitude de dépressions réparties régulièrement (35) et de parties de surface (36) situées entre lesdites dépressions (35), de sorte que la courroie (16) est une courroie texturante et de sorte que, lorsque la courroie (16) passe avec la bande fibreuse (1) à travers la presse (14, 19), lesdites dépressions (35) et lesdites parties de surface (36) forment initialement sur la bande fibreuse (1) un motif texturé équivalent ayant des parties plus épaisses et plus minces, et lorsque la courroie (16) transporte la bande fibreuse (1) jusqu'au cylindre de séchage (5), lesdites parties de surface (36) mettent en contact les parties plus minces de la bande fibreuse (1) contre la surface du cylindre de séchage (5) et l'eau située dans les parties plus épaisses de la bande fibreuse (1) est amenée à s'évaporer.
  2. Courroie selon la revendication 1, comportant une couche de support (33) et une couche de contact avec la bande (34) comportant une couche de polymère compressible ayant une dureté située dans la plage allant de 50 à 97 Shore A, et définissant ladite surface de contact avec la bande.
  3. Courroie selon la revendication 2, dans laquelle ladite surface de contact avec la bande a un degré de rugosité récupérable, sensible à la pression, dans un état non chargé de Rz = 2 à 80 µm, mesuré conformément à la norme ISO 4287, partie I, et un degré de rugosité inférieur de Rz = 0 à 20 µm lorsque ladite couche de polymère est comprimée par une charge linéaire de 20 à 200 kN/m telle que mesurée dans un interstice de presse non étendu.
  4. Courroie selon la revendication 1, comportant une couche arrière (33) et une couche de contact avec la bande (34), ladite couche de contact avec la bande (34) étant formée à partir d'un tissu revêtu d'un polymère de manière à former une structure comportant lesdites dépressions (35) et lesdites parties de surface (36) entre celles-ci, lesdites parties de surface (36) ayant une forme en arc ou convexe.
  5. Courroie selon la revendication 4, dans laquelle lesdites parties de surface en arc ou convexe (36) comportent une pluralité d'articulations (36b) formées par des fils de tissu s'étendant dans une seule et même direction et qui sont uniformément réparties selon un nombre de 25 à 150 articulations/cm2.
  6. Courroie selon l'une quelconque des revendications 1 à 5, dans laquelle lesdites dépressions (35) prennent de 20 % à 50 % de ladite surface de contact avec la bande.
  7. Courroie selon l'une quelconque des revendications 1 à 3, dans laquelle lesdites dépressions (35) sont des gorges continues de ladite surface de contact avec la bande, lesquelles gorges sont agencées en un ou plusieurs groupes, les gorges d'un seul et même groupe s'étendant dans une seule et même direction.
  8. Courroie selon la revendication 7, dans laquelle la distance (a) entre deux gorges d'un seul et même groupe est dans l'intervalle de 1 à 3 mm, la largeur (b) de chaque gorge est dans l'intervalle de 0,5 à 1,0 mm et sa profondeur (c) est dans l'intervalle de 0,1 à 1,0 mm.
  9. Courroie selon la revendication 7, dans laquelle les gorges s'étendent dans la direction longitudinale de la courroie (16) ou forment un angle de 10° à 80° avec celle-ci.
  10. Courroie selon la revendication 7, dans laquelle les gorges sont agencées dans un premier groupe dans lequel les gorges s'étendent dans une seule et même direction, et dans un second groupe dans lequel les gorges s'étendent dans une seule et même direction formant un angle α avec la direction des gorges du premier groupe, lequel angle α est de 10° à 170°.
  11. Courroie selon l'une quelconque des revendications 7 à 10, dans laquelle les gorges sont rectilignes ou ont une forme d'onde.
  12. Courroie selon la revendication 2 ou 3, dans laquelle lesdites dépressions sont des dépressions ayant les mêmes formes géométriques ou des formes géométriques similaires incluant une forme circulaire, elliptique, ou polygonale, la dimension la plus grande de chacune étant située dans l'intervalle de 0,5 à 3 mm et la profondeur dans l'intervalle de 0,5 à 1 mm.
  13. Courroie selon la revendication 2 ou 3, dans laquelle au moins certains desdites dépressions sont des dépressions ayant des formes de symboles non-géométriques comprenant des chiffres, des lettres, des symboles commerciaux ou de société, et ayant des profondeurs situées dans l'intervalle de 0,5 à 1 mm.
  14. Courroie selon l'une quelconque des revendications 1 à 13, dans laquelle la perméabilité à l'air de la courroie (16) est plus petite que 6 m3/m2.min, mesurée conformément au processus décrit dans "Standart Test Method for Air Permeability of Textile Fabrics, ASTM D 737-75, American Society of Testing and Materials".
  15. Machine à papier pour traiter une bande de papier fibreuse humide (1), comportant :
    ■ la courroie de machine à papier (16) selon l'une quelconque des revendications 1 à 14,
    ■ un tronçon de presse (3) comportant une presse ayant deux éléments de presse complémentaires (14, 19) formant un interstice de presse entre eux pour comprimer la bande fibreuse (1) et enlever l'eau de la bande fibreuse (1), ladite courroie (16) étant agencée pour passer avec la bande fibreuse (1) à travers ladite presse, et
    ■ un cylindre de séchage chauffé (5) situé en aval de ladite presse pour recevoir la bande fibreuse comprimée (1) autour d'une partie de la surface dudit cylindre de séchage (5) et ainsi sécher encore plus la bande fibreuse (1) par évaporation d'au moins une partie de l'eau restant dans la bande fibreuse (1), ladite courroie (16) étant agencée pour transporter la bande fibreuse (1) depuis ladite presse vers ledit cylindre de séchage (5) de sorte que ladite courroie (16) met en contact la bande fibreuse (1) contre la surface dudit cylindre de séchage (5).
  16. Machine à papier selon la revendication 15, comportant de plus un feutre de presse (15) agencé pour circuler à travers ladite presse contre la bande fibreuse (1) pour recevoir l'eau exprimée à partir de la bande fibreuse (1).
  17. Machine à papier selon la revendication 15 ou 16, dans laquelle ladite presse est une presse à sabot et lesdits éléments de presse comportent un rouleau de presse formant sabot (14) et un contre-rouleau (19) pour former un interstice étendu entre eux.
  18. Machine à papier selon la revendication 17, dans laquelle ledit tronçon de presse (3) comporte de plus une autre presse agencée en amont de ladite presse à sabot, ladite autre presse ayant deux éléments de presse comportant un rouleau de presse aspirante (13) et un contre-rouleau (19).
  19. Machine à papier selon l'une quelconque des revendications 15 à 17, comportant de plus une caisse d'arrivée (7) pour former la bande fibreuse (1) contre ladite courroie (16).
  20. Machine à papier selon l'une quelconque des revendications 15 à 19, comportant de plus un rouleau de transfert (17) agencé pour mettre en contact ladite courroie (16) et la bande fibreuse (1) contre la surface dudit cylindre de séchage (5).
  21. Procédé de traitement d'une bande de papier fibreuse humide (1), comportant les étapes consistant à :
    ■ faire avancer la bande fibreuse (1) à travers une presse (14, 19) ayant un interstice de presse et comprimer la bande fibreuse (1) pour enlever l'eau de la bande fibreuse (1),
    ■ faire avancer la bande fibreuse comprimée (1) jusqu'à un cylindre de séchage chauffé (5), et
    ■ étendre la bande fibreuse (1) autour d'une partie de la surface du cylindre de séchage (5) pour sécher encore plus la bande fibreuse (1) par évaporation d'au moins une partie de l'eau restant dans la bande fibreuse (1),
    dans lequel la bande fibreuse (1) est transportée entre la presse (14, 19) et le cylindre de séchage (5) à l'aide d'une courroie sensiblement imperméable (16) qui a une surface de contact avec la bande et qui s'étend à travers la presse (14, 19) et vers la surface du cylindre de séchage (15) pour mettre en contact la bande fibreuse (1) contre la surface du cylindre de séchage (5),
    caractérisé par :
    une étape consistant à texturer la bande fibreuse (1) à l'aide de la surface de contact avec la bande de la courroie (16), la surface de contact avec la bande de la courroie (16) définissant une multitude de dépressions réparties de manière régulière (35) et de parties de surface (36) situées entre les dépressions (35),
    ladite étape consistant à texturer ayant lieu lorsque la courroie (16) et la bande fibreuse (1) avancent à travers la presse (14, 19) et lorsque la bande fibreuse (1) est en contact contre la surface du cylindre de séchage (5), de sorte que les dépressions (35) et les parties de surface (36) forment un motif texturé sur la bande fibreuse (1).
  22. Procédé selon la revendication 21, comportant de plus les étapes consistant à :
    ■ faire avancer un feutre de presse (15) à travers la presse (14, 19) avec la bande fibreuse (1) pour recevoir l'eau exprimée à partir de celle-ci, et
    ■ faire avancer le feutre de presse (15) immédiatement après la presse (14, 19) dans une direction s'éloignant de la courroie (16) avant qu'un film d'eau formé dans l'interstice de presse sur la courroie (16) ne soit rompu.
  23. Procédé selon la revendication 21 ou 22, comportant de plus une étape consistant à appliquer une couche continue d'adhésif sur la surface du cylindre de séchage (5) et/ou la bande fibreuse texturée (1) pour favoriser l'adhérence de la bande fibreuse (1) sur le cylindre de séchage (5).
  24. Procédé selon la revendication 22, comportant de plus une étape consistant à transporter la bande fibreuse (1) vers la presse (14, 19) sur le feutre de presse (15).
  25. Procédé selon l'une quelconque des revendications 21 à 24, dans lequel la presse destinée à effectuer ladite étape de compression est une presse à sabot (14, 19) ayant un interstice étendu.
  26. Procédé selon la revendication 25, comportant de plus une étape consistant à comprimer la bande fibreuse (1) dans une presse à rouleaux (13, 19) agencée en amont de la presse à sabot (14, 19) et incluant un rouleau de presse aspirante (13) et un contre-rouleau (19).
  27. Procédé selon l'une quelconque des revendications 21 à 23, dans lequel la courroie (16) transporte aussi la bande fibreuse (1) depuis une caisse d'arrivée (7) destinée à former la bande fibreuse jusqu'à la presse (14, 19).
  28. Procédé selon l'une quelconque des revendications 21 à 27, dans lequel la bande fibreuse (1) est mise en contact contre le cylindre de séchage (5) à l'aide d'un rouleau de transfert (17).
EP98963730A 1997-12-17 1998-12-16 Machine a papier, bande pour machine a papier et procede de fabrication de papier doux texture Expired - Lifetime EP1075566B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07010861.8A EP1832679B1 (fr) 1997-12-17 1998-12-16 Courroie de machine à papier et machine à papier comportant cette courroie

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
US992285 1992-12-16
US08/992,285 US5972813A (en) 1997-12-17 1997-12-17 Textured impermeable papermaking belt, process of making, and process of making paper therewith
SE9800949 1998-03-20
SE9800949A SE511121C3 (sv) 1997-12-17 1998-03-20 Pappersmaskin och saett foer framstaellning av praeglat mjukpapper
US21164798A 1998-12-15 1998-12-15
US211647 1998-12-15
US21279898A 1998-12-16 1998-12-16
PCT/SE1998/002371 WO1999031318A1 (fr) 1997-12-17 1998-12-16 Machine a papier, bande pour machine a papier et procede de fabrication de papier doux texture
US212798 1998-12-16

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP07010861.8A Division EP1832679B1 (fr) 1997-12-17 1998-12-16 Courroie de machine à papier et machine à papier comportant cette courroie

Publications (2)

Publication Number Publication Date
EP1075566A1 EP1075566A1 (fr) 2001-02-14
EP1075566B1 true EP1075566B1 (fr) 2008-01-30

Family

ID=27484807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98963730A Expired - Lifetime EP1075566B1 (fr) 1997-12-17 1998-12-16 Machine a papier, bande pour machine a papier et procede de fabrication de papier doux texture

Country Status (6)

Country Link
EP (1) EP1075566B1 (fr)
JP (1) JP3495704B2 (fr)
AT (1) ATE385271T1 (fr)
BR (1) BR9813780A (fr)
CA (1) CA2314113C (fr)
WO (1) WO1999031318A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE511736C2 (sv) * 1998-03-20 1999-11-15 Nordiskafilt Ab Albany Präglingsband för en pappersmaskin
DE19912226A1 (de) * 1999-03-18 2000-09-28 Sca Hygiene Prod Gmbh Verfahren und Vorrichtung zum Herstellen von Tissue-Papier sowie das damit erhältliche Tissue-Papier
WO2002048453A1 (fr) 2000-12-13 2002-06-20 Metso Paper Karlstad Ab Dispositif et procede d'essorage de tissus
US7387706B2 (en) * 2004-01-30 2008-06-17 Voith Paper Patent Gmbh Process of material web formation on a structured fabric in a paper machine
US7563344B2 (en) * 2006-10-27 2009-07-21 Kimberly-Clark Worldwide, Inc. Molded wet-pressed tissue
SE531891C2 (sv) * 2007-11-20 2009-09-01 Metso Paper Karlstad Ab Struktureringsbeklädnad och förfarande för framställning av en tissuepappersbana
EP2334869B1 (fr) * 2008-09-11 2018-01-17 Albany International Corp. Bande perméable pour la fabrication de mouchoirs, serviettes ou non-tissés
SE533043C2 (sv) * 2008-09-17 2010-06-15 Metso Paper Karlstad Ab Tissuepappersmaskin
DE202017102927U1 (de) * 2017-05-15 2017-08-09 Heimbach Gmbh & Co. Kg Transfer- oder Schuhpressenband für eine Papiermaschine sowie Verwendung des Transfer- oder Schuhpressenbandes in einer Papiermaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
DE4224730C1 (en) * 1992-07-27 1993-09-02 J.M. Voith Gmbh, 89522 Heidenheim, De Tissue paper mfg. machine preventing moisture return - comprises shoe press for press unit(s) for drying tissue web, for min. press units

Also Published As

Publication number Publication date
JP3495704B2 (ja) 2004-02-09
JP2002508460A (ja) 2002-03-19
CA2314113A1 (fr) 1999-06-24
CA2314113C (fr) 2007-07-17
EP1075566A1 (fr) 2001-02-14
ATE385271T1 (de) 2008-02-15
BR9813780A (pt) 2000-10-03
WO1999031318A1 (fr) 1999-06-24

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