EP1925727B1 - Machine pour la fabrication du papier tissu - Google Patents

Machine pour la fabrication du papier tissu Download PDF

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Publication number
EP1925727B1
EP1925727B1 EP08152344A EP08152344A EP1925727B1 EP 1925727 B1 EP1925727 B1 EP 1925727B1 EP 08152344 A EP08152344 A EP 08152344A EP 08152344 A EP08152344 A EP 08152344A EP 1925727 B1 EP1925727 B1 EP 1925727B1
Authority
EP
European Patent Office
Prior art keywords
tissue paper
machine according
paper web
structured
fabric
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.)
Not-in-force
Application number
EP08152344A
Other languages
German (de)
English (en)
Other versions
EP1925727A2 (fr
EP1925727A3 (fr
Inventor
Thomas Scherb
Luiz Carlos Silva
Rogerio Berardi
Davilo Oyakawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1925727A2 publication Critical patent/EP1925727A2/fr
Publication of EP1925727A3 publication Critical patent/EP1925727A3/fr
Application granted granted Critical
Publication of EP1925727B1 publication Critical patent/EP1925727B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • 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
    • D21F3/0281—Wet presses in combination with a dryer roll
    • 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
    • D21F3/10—Suction rolls, e.g. couch rolls

Definitions

  • the invention relates to a machine for producing a tissue paper web according to the preamble of claim 1.
  • the tissue paper web is formed in the Formierpartie on a patterned screen and then dewatered in several dewatering steps, for example. Under pressure, the tissue paper web is guided throughout the dewatering on the structured screen on which it was formed. This forms a tissue paper with bulky, slightly compressed sections and compressed solid sections.
  • an extended nip between the Yankee drying cylinder and formed as a shoe press unit counter surface is formed.
  • the extended nip ensures a good transfer of the tissue paper web from the structured sieve to the Yankee drying cylinder.
  • the extended nip merely has the task of transferring the tissue paper web from the structured sieve to the Yankee drying cylinder. It would therefore be desirable if the expensive shoe press unit could be replaced by a cheaper press roller.
  • Such a method is realized, for example, by a paper machine with a crescent arrangement, in which the tissue paper web is formed in the forming section on a felt and on this until the Yankee drying cylinder, by an extended nip formed between the Yankee drying cylinder and a shoe press unit to be led. In this process, the drying of the tissue paper web takes place to a substantial extent in the extended nip.
  • Tissue paper manufacturers are also faced with changing requirements with regard to the quality and quantity of the tissue paper to be produced. So have to Tissue paper manufacturers sometimes provide their customers with high-quality, fluffy tissue paper in smaller quantities and, at times, less high-quality tissue paper, often in higher quantities.
  • the known machine for producing a tissue paper web has, according to the preamble of claim 1, a formed between the outer surface of a drying cylinder, in particular a Yankee drying cylinder, and a mating surface nip, through which the tissue paper web together with a permeable covering between the fabric and the Jacket surface is arranged guidable.
  • the mating surface is formed by the lateral surface of a press roller, the press roller having a suction zone and holes communicating with the suction zone in the mantle surface having a diameter of less than 3.8 mm.
  • a press configuration which does not require a shoe press unit and which is capable of good transfer in both voluminous and less voluminous tissue paper to provide from the covering to the outer surface of the drying cylinder, as provided by the provision of holes, a vacuum formation in the opening nip is counteracted.
  • the adequate drainage performance can also be provided without the marking of the soft and voluminous tissue paper in particular, if the holes have a diameter of less than 3.8 mm.
  • the diameter of the holes according to the invention are so small that a soft and voluminous tissue paper web can not be pressed into the bores due to a strained sieve, in particular structured sieve, whereby not only a uniform crepe profile after the drying cylinder can be achieved, but also the Transfer of the voluminous and soft tissue paper web to the drying cylinder can be improved.
  • the machine has a forming section for forming the tissue paper web from a stock suspension and a fabric arranged in such a way that the tissue paper web in the forming section on the fabric is formed and is guided by the formed between the lateral surface of the drying cylinder and the lateral surface of the press roll nip.
  • the tissue paper web can be guided from its formation to the nip on the same string, whereby transfer problems can not occur.
  • the covering is a structured sieve, in particular a TAD sieve.
  • the structured screen comprises recessed areas on the side facing the tissue paper web and raised areas relative to the recessed areas, the tissue paper web being formed in the recessed areas and in the raised areas of the structured screen.
  • the formed tissue paper web here has bulky pillow-like portions in the recessed areas of the structured screen and intermediate, lofty portions formed in the raised areas of the structured screen, the bulky portions having a higher basis weight than the less bulky portions.
  • the recessed areas ensure that the sections of the tissue paper web formed in the recessed areas remain protected in this during further drainage - this is because the tissue paper web remains on the structured sieve after it has been formed - and thus only slightly pressed under pressure why their voluminous structure is maintained during dehydration by pressure. Thus, typically only 25-35% of the tissue paper web is pressed under pressure.
  • the dewatering performance is influenced by the open area in the lateral surface of the press roll.
  • the best results with regard to the drainage performance are achieved if an open area of 16% to 30%, preferably 18% to 26%, particularly preferably 20% to 22%, of the total area of the lateral surface is formed by the holes becomes.
  • the lateral surface does not include the negative pressure zone communicating blind holes having a diameter of 2.7mm or less, in particular 2.4mm or less, said the blind holes can be arranged on the lateral surface at least in sections between the blind holes.
  • an open area of 16% to 30%, preferably from 18% to 26%, particularly preferably from 20% to 22% of the total area of the lateral surface is formed by the holes and the blind holes together.
  • the holes and the blind holes together form a regular pattern on the lateral surface of the press roll at least in sections.
  • the holes or the holes and the blind holes on the lateral surface for example. Be arranged along a family of parallel lines.
  • the dewatering device preferably comprises a dewatering section and a pressure device and is configured such that the tissue paper web can be guided along the dewatering section between the structured covering, in particular the structured screen, and another permeable covering, and by means of the printing device such pressure on the structured screen, the tissue paper web and the further permeable fabric is exercisable, that the tissue paper web is dewatered in the direction of the further permeable fabric.
  • the further permeable covering is preferably a felt with a sufficiently high water absorption capacity for the water pressed out of the tissue paper web.
  • Regarding the structure of the lower clothing is on the PCT / EP2005 / 050198 directed.
  • the compressibility (thickness change in mm when force is applied to N) of the structured sieve is smaller than the compressibility of the further permeable clothing.
  • the voluminous structure of the tissue paper web is maintained at the pressure.
  • the dynamic stiffness (K) as a measure of the compressibility of the further permeable clothing is 100000N / mm or less, preferably 90000N / mm, more preferably 70000N / mm or less.
  • the G-modulus as a measure of the elasticity of the further permeable cover is 2N / mm 2 or more, preferably 4N / mm 2 or more.
  • the water stored in the further permeable clothing for example the felt, can be expelled more easily with a gas stream if the permeability of the further permeable clothing is not too high. It proves to be advantageous if the permeability of the further permeable clothing is 80 cfm or less, preferably 40 cfm or less, more preferably 25 cfm or less. In the areas mentioned above, rewetting of the tissue paper web is largely prevented by the further permeable covering.
  • the hereby on the arrangement of structured sieve, tissue paper web and further pressure applied to the permeable fabric can be caused by a gas flow. Additionally or alternatively, the pressure exerted can be effected by a mechanical pressing force.
  • a gas flow can be generated by the pressure device in such a way that the dewatering of the tissue paper web firstly flows through the structured sieve, then the tissue paper web and then the further permeable covering by the gas. The dewatering of the paper web takes place in the direction of the further permeable clothing.
  • the pressure device comprises a press belt under tension, which is arranged such that the arrangement of structured wire, tissue paper web and further permeable clothing at least in sections along the dewatering section between the press belt and a smooth surface is feasible, wherein the press belt acts on the structured screen and the other permeable clothing is supported on the smooth surface.
  • a dewatering of the tissue paper web takes place in the direction of the further permeable clothing.
  • the arrangement of structured sieve, tissue paper web and further permeable clothing is flowed through at least in sections in the region of the dewatering section by the gas stream, so that the dewatering takes place simultaneously by the pressing force of the press belt and the flow through the gas.
  • the press belt By a high tension of the press belt, the pressing force can be increased.
  • the press belt is under a tension of at least 30kN / m, preferably at least 60kN / m or 80kN / m.
  • the press belt can in this case have a spiral structure and, for example, be designed as a so-called SiralLinkFabric. Furthermore, it is possible that the press belt has a woven structure.
  • the press belt has an open area of at least 25% and a contact area of at least 10% of its total to the upper clothing has facing surface.
  • the press belt has an open area between 75% and 85% and a contact area between 15% and 25% of its total surface facing the upper clothing.
  • the press belt has an open area between 68% and 76% and a contact area between 24% and 32% of its total surface facing the upper clothing.
  • the press belt has an open area of 50% or more and a contact area of 50% or more of its entire upper clothing facing surface. In this way, both a good gas flow through the press belt as well as a homogeneous pressing force can be provided by means of the press belt.
  • the smooth surface is preferably formed by the lateral surface of a roller.
  • the gas flow can be generated by a suction zone in a roller.
  • the suction zone has a length in the range between 200mm and 2500mm, preferably between 800mm and 1800mm, more preferably between 1200mm and 1600mm and the negative pressure in the suction zone is between -0.2bar and -0.8bar, preferably between -0, 4bar and -0,6bar.
  • the gas flow can also be generated by an overpressure hub arranged above the upper clothing.
  • the temperature of the gas flow is between 50 ° C and 180 ° C, preferably between 120 ° C and 150 ° C and the pressure is less than 0.2bar, preferably less than 0.1 bar and more preferably less than 0, 05bar.
  • the gas can be hot air or steam.
  • tissue paper web By the dewatering process described above, it is possible for the tissue paper web to leave the dewatering section at a dry content of more than 30%.
  • the machine for producing a tissue paper web has a forming section, in which the tissue paper web is formed from a stock suspension on a covering. Furthermore, the machine has a nip formed between the outer surface of a drying cylinder, in particular a Yankee drying cylinder, and a mating surface, through which the tissue paper web can be guided together with the fabric, the configuration of the machine being variable such that depending on the quality For example, absorbency or tear strength of the tissue paper to be produced, the fabric is either a three-dimensionally structured fabric, in particular a structured fabric, or a non-structured fabric, in particular a felt, wherein the counter surface is formed by the lateral surface of a press roll comprising a suction zone and wherein arranged in the lateral surface and communicating with the suction zone bores are provided.
  • the tissue paper web is formed on the patterned wire and dewatered, thereby providing the tissue paper web with a high bulk weight sectional bulk structure.
  • a press roll with holes for the nip formed with the drying cylinder, in particular Yankee cylinder a good transfer of the tissue paper web from the structured wire to the drying cylinder is ensured.
  • the high-quality and bulky tissue paper preferably has a bulk value of 10 or more cm 3 / g, preferably 10-16 cm 3 / g and a water retention capacity of 10 g of water per g of fibers, preferably 10-16 g of water per g of fibers.
  • the tissue paper web When using the non-structured permeable fabric, in particular the felt, the tissue paper web is formed on this and dewatered, whereby the Tissue paper web gets a less voluminous structure than when using the structured sieve.
  • Such a tissue paper web can be produced with higher productivity (in tons of tissue paper per time) due to higher machine speed.
  • a press roll with holes for the nip formed with the drying cylinder, in particular Yankee cylinder By using a press roll with holes for the nip formed with the drying cylinder, in particular Yankee cylinder, a good transfer of the tissue paper web from the non-structured covering to the drying cylinder is ensured.
  • the press roll is sucked through the holes, whereby a sufficient drainage performance is ensured by the nip.
  • the lower quality and less voluminous tissue paper preferably has a bulk of less than 10 cm 3 / g, preferably from 6-9cm 3 / g and a water retention capacity of less than 10 g water per g of fibers, preferably 6-9 g of water per g fibers.
  • the three-dimensionally structured and permeable fabric in particular the structured fabric
  • the non-structured fabric in particular the felt
  • the machine comprises a dewatering device disposed between the forming section and the nip, which is operable with respect to the nip such that the tissue paper web by the dewatering device during operation with the structured and permeable fabric to a greater extent and when operating with the non-structured and permeable clothing to a smaller extent than is drained by the nip.
  • a dewatering device disposed between the forming section and the nip, which is operable with respect to the nip such that the tissue paper web by the dewatering device during operation with the structured and permeable fabric to a greater extent and when operating with the non-structured and permeable clothing to a smaller extent than is drained by the nip.
  • tissue paper web is passed by the dewatering device, i. not being drained by this at all.
  • the bulky and more absorbent tissue paper is produced on the structured sieve, i. is formed and dewatered up to and including the nip formed by the lateral surface of the drying cylinder and the lateral surface of the suction press roll and this is dewatered more by the dewatering device than by the nip.
  • the drainage is less on the nip, this is essentially the task of transferring the tissue paper from the screen to the outer surface of the drying cylinder to.
  • a good transfer is provided when the line force generated in the nip is preferably less than 120 kN / m, in particular 60-90 kN / m.
  • the less voluminous and less absorbent tissue paper is made on the felt, ie formed and up to and including the shell surface dehydrated nip formed in the drying cylinder and the outer surface of the suction press roll, this is dewatered more by the nip than by the dewatering device. Since in this case the dewatering takes place more via the nip than via the dewatering device, the nip essentially has the task of dewatering the tissue paper and transferring the tissue paper from the wire to the outer surface of the drying cylinder.
  • the bores are arranged and formed such that the tissue paper web after the nip, in both modes of the machine, i. with the structured and with the non-structured covering a dry content of 31% or more, whereby when operating with the structured covering after the nip a dry content of 31-36% and when operating with the non-structured fabric after the nip a dry content of 37 -41% is achieved.
  • the holes have a diameter of less than 3.8 mm, in particular less than 3.5 mm.
  • the FIG. 1 shows a tissue paper machine 1 with a Formierpartie 2 in which a tissue paper web 3 from a stock suspension 4 on a fabric 5, 11 is formed and formed with a between the outer surface 6 of a Yankee drying cylinder 7 and the outer surface 8 of a press roll 9 nip 10, through the the tissue paper web 3 together with the fabric 5, 11 is feasible.
  • the configuration of the machine 1 is variable such that, depending on the quality such as absorbency or tear strength of the tissue paper 3 to be produced as a covering 5, 11, either a structured sieve 5 or a felt 11 (this configuration is described in US Pat FIG. 2 shown) is used, wherein the pressure roller 9 comprises a suction zone 12 and in the lateral surface 8 of the press roller 9 communicating with the suction zone 12 holes 30 are provided.
  • the structured fabric 5 is used, and the felt 11 is used to produce lower absorbency tissue 3 '.
  • the tissue paper web 3 When configuring the FIG. 1 the tissue paper web 3 is passed through a drainage device 34 arranged between the forming section 2 and the nip 10 and dewatered by the latter. In contrast, when in the FIG. 2 shown configuration of the machine 1, the tissue paper web 3 is not passed through the arranged between the Formierpartie 2 and the nip 10 drainage device 34 and thus not dewatered by this.
  • FIGS. 3 to 6 Turns to the process of producing high quality, bulky and absorbent tissue paper 3 with the machine 1 configuration according to the FIG. 1 explained.
  • the stock suspension 4 exits from a head box 13 in such a way that it is injected into the incoming gap between a forming fabric 14 and the structured, in particular 3-dimensional structured fabric 5, whereby a tissue paper web 3 is formed.
  • the forming fabric 14 has a side 15 directed towards the tissue paper web 3 which is smooth relative to the side 16 of the structured fabric 5 directed towards the tissue paper web 3.
  • the side 16 of the structured screen 5 facing the tissue paper web 3 has recessed areas 17 and elevated areas 18 relative to the recessed areas 17, so that the tissue paper web 3 is formed in the recessed areas 17 and the raised areas 18 of the structured screen 5.
  • the height difference between the recessed areas 17 and the raised areas 18 is preferably 0.07 mm and 0.6 mm.
  • the area formed by the raised areas 17 is preferably 10% or more, more preferably 20% or more, and most preferably 25% to 30% of the page 16 facing the tissue paper web 3 FIG. 3
  • the structured sieve 5 is designed as a TAD sieve 5.
  • the array of TAD wire 5, tissue paper web 3 and forming wire 14 is directed around a forming roll 19 and the tissue paper web 3 is substantially dewatered through the forming fabric 14 before the forming fabric 14 is removed from the tissue paper web 3 and the tissue paper web 3 on the TAD -Sieb 5 is transported.
  • FIG. 4 the structure of the tissue paper web 3 formed between the flat forming fabric 14 and the TAD wire 5 can be seen.
  • the bulky pillow-like sections C 'formed in the recessed areas 17 of the TAD sieve 5 Tissue paper web 3 has a higher volume and a higher basis weight than the sections A 'of the tissue paper web 3 formed in the raised regions 18 of the TAD sieve 5.
  • the tissue paper web 3 therefore already has a 3-dimensional structure due to its formation on the structured sieve 5.
  • the tissue paper web 3 is guided between the structured sieve 5 which is arranged at the top and a further permeable clothing 20 formed as a felt 20, wherein pressure is applied to the structured sieve 5, the tissue paper web 3 and the felt 20 during the dewatering step along a dewatering path 21 is applied so that the tissue paper web 3 is dewatered in the direction of the felt 20, as indicated by the arrows 22 in the FIG. 5 is indicated.
  • the fibers of the tissue paper web 3 are pressed against the felt 20, whereby the contacted with the felt 20 side of the tissue paper web 3 is almost flat.
  • the bulky portions C ' are compressed less than the portions A'. so that, as a result, the bulky structure of the sections C 'is maintained.
  • the pressure for dewatering the tissue paper web 3 is generated in the dewatering step at least in sections simultaneously by a gas flow and by a mechanical pressing force.
  • the gas stream flows through first the structured sieve 5, then the tissue paper web 3 and then the further covering formed as felt 20.
  • the gas flow through the tissue paper web 3 is about 150m 3 per minute and meter web length.
  • the gas flow is generated by a suction zone 23 in a roller 24, wherein the suction zone 23 has a length in the range between 200mm and 2500mm, preferably between 800mm and 1800mm, more preferably between 1200mm and 1600mm.
  • the negative pressure in the suction zone 23 is between -0.2bar and -0.8bar, preferably between -0.4bar and -0.6bar.
  • the mechanical pressing force is generated by guiding the structured screen 5, tissue paper web 3 and felt 20 assembly on the dewatering path 21 between a tensioned press belt 25 and a smooth surface 26 in the dewatering step, the press belt 25 resting on the structured wire 5 acts and the felt 20 is supported on the smooth surface 26.
  • the smooth surface 26 is in this case formed by the lateral surface 26 of the roller 24.
  • the dewatering section 21 is essentially defined by the wrap area of the press belt 25 about the lateral surface 26 of the roller 24, wherein the wrap is determined by the distance between the two pulleys 27 and 28.
  • the press belt 25 is under a tension of at least 30 kN / m, preferably at least 60kN / m or 80kN / m and has an open area of at least 25% and a contact area of at least 10% of its total upper facing area.
  • the press belt 25 is formed as a spiral link fabric and has an open area of between 51% and 62% and a contact area between 38% and 49% of its total surface facing the upper clothing.
  • the tissue paper web 3 leaves the dewatering section 21 with a dry content of 30% or more.
  • the tissue paper web 3 may be subjected to an additional drying step carried out by the indicated device 29.
  • the tissue paper web 3 Before the tissue paper web 3 passes through the nip 10, it is guided together with the structured sieve 5 around an evacuated deflection roller 32, wherein the structured sieve 5 is arranged between the tissue paper web 3 and the evacuated deflection roller 32. As a result, the structured sieve 5 moisture can be removed.
  • the tissue paper web 3 is guided through the nip 10 together with the structured wire 5, the tissue paper web 3 being arranged in the nip 10 between the structured wire 5 and the smooth roller surface 6 of a Yankee drying cylinder 7 (see FIG FIG. 6 ).
  • the nip 10 is here through the Yankee drying cylinder 7 and the Saugpresswalze 9 formed.
  • the tissue paper web 3 lies on the side which has been formed on the flat forming fabric 15 and in the direction of which the tissue paper web 3 in the dewatering device 34 has been dewatered with a relatively large area, ie 90% or more of the total area of this side, on the lateral surface 6 of the Yankee drying cylinder 7, wherein the tissue paper web 3 rests on the other side on the structured wire 5.
  • the line force generated in the nip is 60-90 kN / m, so that essentially only a transfer of the tissue paper web 3 from the structured wire 5 to the Yankee drying cylinder 7 is accomplished by the nip 10.
  • the press roller 9 in its lateral surface 8 holes 30 and 31 (in FIG. 7 to recognize), a good transfer of the tissue paper web 3 is ensured. Furthermore, the press roll 9 is driven, whereby the transfer of the tissue paper web 3 from the structured wire 5 to the Yankee drying cylinder 7 is further improved.
  • a drying hood 33 may additionally be arranged above the Yankee drying cylinder 7 in such a way that the tissue paper web 3 is guided between the drying hood 33 and the jacket surface 6 of the Yankee drying cylinder 7.
  • the Figure 7a The lateral surface 8 has bores 30 and 31.
  • the bores 30 communicate with the suction zone 12 of the press roll 9, ie are in flow communication with the suction zone 12 of the press roll 9.
  • the bores 30 have a diameter of 2.9mm, whereby a marking of the tissue paper 3 is prevented when passing through the nip 10.
  • blind bores 31, which have a smaller diameter than the bores 30, are arranged on the lateral surface 8 between the bores 30.
  • the blind holes 31 have a diameter of 2.4 mm in the present embodiment. Through the blind holes 31, the marking of the tissue paper 3 is further reduced.
  • the bores 30 and the blind bores 31 are arranged on the lateral surface 8 along a family of mutually parallel lines (indicated by dashed lines).
  • FIG. 7b shows the transverse profile of the tissue paper web 3 produced, as this results after creping after the circulation around the Yankee drying cylinder 7. Because the bores 30 and the blind bores 31 have a small diameter, no marking of the tissue paper 3 in the nip 10 occurs, ie the profile of the tissue paper web 3 is uniform.
  • FIG. 8b In comparison, in the FIG. 8b to recognize the cross profile of a tissue paper web, as this results after creping after the circulation around the Yankee drying cylinder 7.
  • the tissue paper web shown was produced under the same conditions as the tissue paper web 3 with the only difference that the circumferential surface 8 'of the press roll 9' used in the nip 10 has holes with a diameter of 3.8 mm or more. As you can see, the profile has elevations that correlate with the holes 30 '( FIG. 8a ).
  • the stock suspension 4 emerges from the headbox 13 in such a way that it is injected into the incoming gap between the forming fabric 14 and the non-structured fabric formed as a felt 11, whereby the tissue paper web 3 'is formed.
  • the forming fabric 14 has a side 15 directed towards the tissue paper web 3 'which is approximately the same size as the side 34 of the felt 11 facing the tissue paper web 3'.
  • the assembly of felt 11, tissue paper web 3 'and forming fabric 14 is directed around the forming roll 19 and the tissue paper web 3' is substantially dewatered through the forming fabric 14 before the forming fabric 14 is removed from the tissue paper web 3 'and the tissue paper web 3' the felt 11 is transported on.
  • FIG. 10 the bilaterally smooth structure of the tissue paper web 3 'formed between the flat forming fabric 14 and the flat felt 11 can be seen.
  • the tissue paper web 3 'does not run through the dewatering device 34 arranged between the forming section 2 and the nip 10 and is therefore not dewatered by it.
  • the tissue paper web 3 ' may be dewatered by a drying step performed by the indicated means 29.
  • the felt 11 Before the tissue paper web 3 'passes through the nip 10, it is guided together with the felt 11 around the evacuated deflection roller 32, the felt 11 being arranged between the tissue paper web 3' and the evacuated deflection roller 32. As a result, the felt 11 can be deprived of moisture so much that it can absorb sufficient moisture pressed out by the tissue paper web 3 'during the subsequent dewatering step in the nip 10.
  • the tissue paper web 3 ' is guided in a dewatering step together with the felt 11 through the nip 10, wherein the tissue paper web 3' in the nip 10 between the felt 11 and the smooth roll surface 6 of the Yankee drying cylinder 7 is arranged.
  • the nip 10 is formed here by the Yankee drying cylinder 7 and the suction press roll 9.
  • the line force generated in the nip is 120 kN / m or less, so that dewatering of the tissue paper web 3 'and subsequent transfer of the tissue paper web 3' from the felt 11 to the Yankee drying cylinder 7 are accomplished by the nip 10.
  • FIG. 11 shows the tissue paper web 3 'passing through the nip 10.
  • the press roll 9 Since the press roll 9 has bores 30 in its lateral surface which communicate with the suction zone 12 of the press roll 9, rewet in the nip opening is prevented, thereby increasing the dry content of the tissue paper web 3 '.
  • the holes further ensure a good transfer of the tissue paper web 3 'to the Yankee drying cylinder 7. Further, the press roller 9 is driven, whereby the transfer of the tissue paper web 3 'from the felt 11 to the Yankee drying cylinder 7 is further improved.
  • a drying hood 33 can additionally be provided above the Yankee drying cylinder 7 be arranged so that the tissue paper web 3 'between the drying hood 33 and the outer surface 6 of the Yankee drying cylinder 7 is guided.
  • tissue paper web 3 ' has a much more compact structure than that with the configuration of the FIG. 1 formed tissue paper web 3, there is no risk in the tissue paper web 3 'that this is marked in the nip 10 due to the holes 30 and 31.

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Claims (39)

  1. Machine (1) pour la fabrication d'une nappe de papier tissu (3) comprenant un pinçage (10) formé entre la surface d'enveloppe (6) d'un cylindre de séchage (7), notamment un cylindre de séchage Yankee (7), et une surface conjuguée (8), à travers lequel la nappe de papier tissu (3) peut être guidée conjointement avec une toile perméable (5, 11), entre la toile (5, 11) et la surface d'enveloppe (6),
    caractérisée en ce que
    la surface conjuguée (8) est formée par la surface d'enveloppe (8) d'un rouleau de pressage (9), le rouleau de pressage (9) comprenant une zone d'aspiration (12) et des alésages (30) communiquant avec la zone d'aspiration (12) étant prévus dans la surface d'enveloppe (8) lesquels présentent un diamètre inférieur à 3,8 mm.
  2. Machine selon la revendication 1,
    caractérisée en ce que
    le machine présente une section de formage (2) pour former la nappe de papier tissu (3) à partir d'une suspension de matière fibreuse (4) et une toile (5, 11) disposée de telle sorte que la nappe de papier tissu (3) soit formée dans la section de formage (2) sur la toile (5, 11) et soit guidée à travers le pinçage (10) formé entre la surface d'enveloppe (6) du cylindre de séchage (7) et la surface d'enveloppe (8) du rouleau de pressage (9).
  3. Machine selon l'une quelconque des revendications 1 à 2,
    caractérisée en ce que
    la machine comprend un dispositif d'égouttage (34) disposé entre le pinçage (10) et la section de formage (2).
  4. Machine selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    les alésages (30) ont un diamètre de 3,5 mm ou moins, de préférence de 3,0 mm ou moins, particulièrement préférablement de 2,7 mm ou moins.
  5. Machine selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce
    qu'une surface ouverte de 16% à 30%, de préférence de 18% à 26%, particulièrement préférablement de 20% à 22% de la surface totale de la surface d'enveloppe est formée par les alésages (30).
  6. Machine selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    les alésages (30) forment sur la surface d'enveloppe (8) du rouleau de pressage (9) au moins en partie un motif régulier.
  7. Machine selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    la surface d'enveloppe (8) comprend des alésages borgnes (31) qui ne communiquent pas avec la zone de dépression (12), et qui ont un diamètre de 2,7 mm ou moins, notamment de 2,4 mm ou moins.
  8. Machine selon la revendication 7,
    caractérisée en ce que
    sur la surface d'enveloppe (8), les alésages borgnes (31) sont disposés au moins en partie entre les alésages (30).
  9. Machine selon la revendication 7 ou 8,
    caractérisée en ce que
    les alésages (30) et les alésages borgnes (31) forment ensemble sur la surface d'enveloppe (8) du rouleau de pressage (9) au moins en partie un motif régulier.
  10. Machine selon l'une quelconque des revendications 7 à 9,
    caractérisée en ce que
    les alésages (30) et les alésages borgnes (31) sur la surface d'enveloppe (8) sont disposés le long d'un groupe de lignes parallèles les unes aux autres.
  11. Machine selon l'une quelconque des revendications 1 à 10,
    caractérisée en ce que
    le rouleau de pressage (9) est entraîné.
  12. Machine selon l'une quelconque des revendications 1 à 11,
    caractérisée en ce que
    la toile (5) est un tamis structuré, notamment un tamis TAD.
  13. Machine selon la revendication 12,
    caractérisée en ce que le côté (16) du tamis structuré (5) tourné vers la nappe de papier tissu (3) comprend des régions renfoncées (17) et des régions rehaussées (18) par rapport aux régions renfoncées.
  14. Machine selon la revendication 13,
    caractérisée en ce que
    la nappe de papier tissu (3) est formée dans les régions renfoncées et les régions rehaussées du tamis structuré (5).
  15. Machine selon l'une quelconque des revendications 1 à 14,
    caractérisée en ce que
    la force linéaire produite dans le pinçage (10) est inférieure à 120 kN/m.
  16. Machine selon l'une quelconque des revendication 7 à 11,
    caractérisée en ce que
    la toile (11) est un feutre.
  17. Machine selon l'une quelconque des revendications 3 à 16,
    caractérisée en ce que
    le dispositif d'égouttage (34) comprend une section d'égouttage (21) et un dispositif de pressage (23, 25), la nappe de papier tissu (3) pouvant être guidée le long de la section d'égouttage (21) entre la toile structurée (5) et une autre toile perméable (20), et une pression pouvant être appliquée au moyen du dispositif de pressage (23, 25) sur le tamis structuré (5) de telle sorte que la nappe de papier tissu (3) soit égouttée dans la direction de l'autre toile perméable (20).
  18. Machine selon l'une quelconque des revendications 3 à 17,
    caractérisée en ce que
    le dispositif d'égouttage (34), lors du fonctionnement de la machine avec une toile structurée (5), contribue à l'égouttage de la nappe de papier tissu et en ce que le dispositif d'égouttage (34), lors du fonctionnement de la machine avec une toile non structurée (11) ne contribue pas à l'égouttage de la nappe de papier tissu (3).
  19. Machine selon l'une quelconque des revendications 17 à 18,
    caractérisée en ce que
    la toile perméable supplémentaire (20) est un feutre.
  20. Machine selon l'une quelconque des revendications 17 à 19,
    caractérisée en ce que
    la nappe de papier tissu (3), lors de la sollicitation en pression dans le dispositif d'égouttage (34), est moins fortement comprimable dans les régions renfoncées (17) du tamis structuré que dans les régions rehaussées (18).
  21. Machine selon l'une quelconque des revendications 17 à 20,
    caractérisée en ce que
    la compressibilité du tamis structuré (5) est inférieure à celle de la toile perméable supplémentaire (20).
  22. Machine selon l'une quelconque des revendications 17 à 21,
    caractérisée en ce que
    la rigidité dynamique (K) en tant que mesure de la compressibilité du tamis structuré (5) est de 3000 N/mm ou plus.
  23. Machine selon l'une quelconque des revendications 17 à 22,
    caractérisée en ce que
    la rigidité dynamique (K) en tant que mesure de la compressibilité de la toile perméable supplémentaire (20) est de 100 000 N/mm ou moins, de préférence de 90 000 N/mm, particulièrement préférablement de 70 000 N/mm ou moins.
  24. Machine selon l'une quelconque des revendications 17 à 23,
    caractérisée en ce que
    le module G en tant que mesure de l'élasticité de la toile perméable supplémentaire (20) vaut 2 N/mm2 ou plus, de préférence 4 N/mm2 ou plus.
  25. Machine selon l'une quelconque des revendications 17 à 24,
    caractérisée en ce que
    la perméabilité de la toile perméable supplémentaire (20) est de 80 cfm ou moins, de préférence de 40 cfm ou moins, particulièrement préférablement de 25 cfm ou moins.
  26. Machine selon l'une quelconque des revendications 17 à 25,
    caractérisée en ce que
    l'on peut produire un écoulement de gaz à partir du dispositif de pressage (23, 25), de sorte que pour l'égouttage de la nappe de papier tissu (3), d'abord le tamis structuré (5), puis la nappe de papier tissu (3), et ensuite la toile perméable supplémentaire (20) soient parcourus par l'écoulement de gaz.
  27. Machine selon l'une quelconque des revendications 17 à 26,
    caractérisée en ce que
    le dispositif de pressage comprend une bande de pressage (25) sous tension, qui est disposée de telle sorte que l'agencement de la toile structurée (5), notamment du tamis structuré, de la nappe de papier tissu (3) et de la toile perméable supplémentaire (20) puisse être guidé au moins en partie le long de la section d'égouttage (21), entre la bande de pressage (25) et une surface lisse (26), la bande de pressage (25) agissant sur la toile structurée (5) et supportant la toile perméable supplémentaire (20) contre la surface lisse (26).
  28. Machine selon l'une quelconque des revendications 26 et 27,
    caractérisée en ce que
    l'écoulement de gaz à travers la nappe de papier tissu (3) est d'environ 150 m3 par minute et par mètre de longueur le long de la section d'égouttage.
  29. Machine selon l'une quelconque des revendications 27 à 28,
    caractérisée en ce que
    la bande de pressage (25) est sous une tension d'au moins 30 kN/m, de préférence d'au moins 60 kN/m ou de 80 kN/m.
  30. Machine selon l'une quelconque des revendications 27 à 29,
    caractérisée en ce que
    la bande de pressage (25) a une surface ouverte d'au moins 25% et une surface de contact d'au moins 10% de sa surface totale tournée vers la toile structurée (5).
  31. Machine selon la revendication 30,
    caractérisée en ce que
    la bande de pressage (25) a une surface ouverte entre 75% et 85% et une surface de contact entre 15% et 25% de sa surface totale tournée vers la toile structurée (5).
  32. Machine selon la revendication 30,
    caractérisée en ce que
    la bande de pressage (25) a une surface ouverte entre 68% et 76% et une surface de contact entre 24% et 32% de sa surface totale tournée vers la toile structurée (5).
  33. Machine selon la revendication 30,
    caractérisée en ce que
    la bande de pressage (25) a une surface ouverte entre 51% et 62% et une surface de contact entre 38% et 49% de sa surface totale tournée vers la toile structurée (5).
  34. Machine selon l'une quelconque des revendications 27 à 33,
    caractérisée en ce que
    la surface lisse (26) est formée par la surface d'enveloppe d'un rouleau (24).
  35. Machine selon la revendication 34,
    caractérisée en ce que
    le dispositif de pressage pour produire l'écoulement de gaz présente une zone d'aspiration (23) dans le rouleau (24).
  36. Machine selon la revendication 35,
    caractérisée en ce que
    la zone d'aspiration (23) a une longueur comprise entre 200 mm et 2500 mm, de préférence entre 800 mm et 1800 mm, particulièrement préférablement entre 1200 mm et 1600 mm.
  37. Machine selon la revendication 35 ou 36, caractérisée en ce que
    la dépression dans la zone d'aspiration (23) est comprise entre -0,2 bar et -0,8 bar, de préférence entre -0,4 bar et -0,6 bar.
  38. Machine selon l'une quelconque des revendications 26 à 37,
    caractérisée en ce que
    le dispositif de pressage pour produire l'écoulement de gaz comprend un système de surpression disposé au-dessus du tamis structuré (5).
  39. Machine selon l'une quelconque des revendications 17 à 38,
    caractérisée en ce que
    la nappe de papier tissu (3) quitte la section d'égouttage (21) avec une teneur en matière sèche de plus de 30%.
EP08152344A 2005-08-05 2006-05-19 Machine pour la fabrication du papier tissu Not-in-force EP1925727B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005036891A DE102005036891A1 (de) 2005-08-05 2005-08-05 Maschine zur Herstellung von Tissuepapier
EP06114198A EP1749934B1 (fr) 2005-08-05 2006-05-19 Machine pour la fabrication du papier tissu

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP06114198A Division EP1749934B1 (fr) 2005-08-05 2006-05-19 Machine pour la fabrication du papier tissu
EP06114198.2 Division 2006-05-19

Publications (3)

Publication Number Publication Date
EP1925727A2 EP1925727A2 (fr) 2008-05-28
EP1925727A3 EP1925727A3 (fr) 2008-06-18
EP1925727B1 true EP1925727B1 (fr) 2010-08-04

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EP08152344A Not-in-force EP1925727B1 (fr) 2005-08-05 2006-05-19 Machine pour la fabrication du papier tissu
EP06114198A Not-in-force EP1749934B1 (fr) 2005-08-05 2006-05-19 Machine pour la fabrication du papier tissu

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Application Number Title Priority Date Filing Date
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Country Link
US (2) US20070029061A1 (fr)
EP (2) EP1925727B1 (fr)
AT (2) ATE476547T1 (fr)
DE (3) DE102005036891A1 (fr)

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Also Published As

Publication number Publication date
EP1925727A2 (fr) 2008-05-28
ATE476547T1 (de) 2010-08-15
DE502006006492D1 (de) 2010-05-06
ATE462041T1 (de) 2010-04-15
DE502006007602D1 (de) 2010-09-16
US20110290439A1 (en) 2011-12-01
US20070029061A1 (en) 2007-02-08
US8303773B2 (en) 2012-11-06
EP1925727A3 (fr) 2008-06-18
EP1749934A1 (fr) 2007-02-07
EP1749934B1 (fr) 2010-03-24
DE102005036891A1 (de) 2007-02-08

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