EP1754824A1 - Procédé de fabrication de papier tissu - Google Patents

Procédé de fabrication de papier tissu Download PDF

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Publication number
EP1754824A1
EP1754824A1 EP06114209A EP06114209A EP1754824A1 EP 1754824 A1 EP1754824 A1 EP 1754824A1 EP 06114209 A EP06114209 A EP 06114209A EP 06114209 A EP06114209 A EP 06114209A EP 1754824 A1 EP1754824 A1 EP 1754824A1
Authority
EP
European Patent Office
Prior art keywords
tissue paper
paper web
structured
fabric
dewatering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06114209A
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German (de)
English (en)
Inventor
Thomas Scherb
Ronaldo Parucker
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 EP1754824A1 publication Critical patent/EP1754824A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • This invention relates to a process for producing tissue paper according to the preamble of claim 1.
  • Tissue paper ideally has high absorbency and high water absorption coupled with high tear resistance.
  • tissue paper In the production of tissue paper this is performed in a final drying step on the surface of a heated Yankee drying cylinder before the finished product is creped by this. When guiding the tissue paper web over the Yankee drying cylinder, it is held by a covering.
  • tissue paper web Furthermore, formation of water vapor between the tissue paper web and the heated jacket surface of the Yankee dryer cylinder can result in blistering and hole formation in the tissue paper web.
  • the tissue paper web is pressed onto a three-dimensionally structured sieve for structuring it. Furthermore, in the known method, the tissue paper web is guided over a heated surface in a drying step without a covering.
  • the tissue paper web in a drying step preceding the other drying step, is guided only over the structured sieve and is guided over at least one heated surface.
  • the permeable fabric holds the tissue paper web by passing the tissue paper web between the fabric and the heated surface.
  • the tissue paper web is dried by contact drying on the heated surface. Water contained in the tissue paper web evaporates and escapes through the permeable fabric. The tissue paper web is further held by the permeable fabric on the heated surface and thus can not lift off in this drying step.
  • the other drying step is in this case carried out such that the tissue paper web sufficient moisture is removed, so that the tissue paper web has a dry content sufficient that it is not guided from this surface in the subsequent drying step in which it is not held over a heated surface Steam evolution takes off.
  • the drying performance of the Yankee drying cylinder can be reduced to achieve the same dry content after the creping process, which saves investment and operating costs.
  • the heated surface in the drying step is preferably formed by the jacket surface of a Yankee drying cylinder.
  • the heated surface is formed in the other drying step by the lateral surface of a conventional drying cylinder, which is wrapped by the permeable fabric to a greater extent.
  • the conventional drying cylinder is preferably one having a diameter of 2 meters or less. As a result, the investment costs for providing the other drying step are significantly reduced.
  • a plurality of heated surfaces are provided, which are each formed by the lateral surface of a drying cylinder wrapped by the permeable clothing to a greater extent.
  • portions of the tissue paper web are preferably compressed more than other portions of the tissue paper web. This is possible, for example, when the tissue paper web from the stock suspension is already formed on a three-dimensionally structured sieve.
  • the tissue paper web here has bulky pillow-like portions (pillow area) formed in the recessed areas of the structured screen with intermediate and lower voluminous portions formed in the raised areas of the structured screen.
  • the bulky portions of the tissue paper web formed in the recessed areas of the structured screen also have a higher basis weight than the less voluminous sections therebetween.
  • the tissue paper web After the other drying step, the tissue paper web has a solids content of 34% or more, preferably 38% or more.
  • the structured sieve may be a TAD sieve.
  • the tissue paper web is preferably passed in a dewatering step between an upper structured, in particular 3 * -dimensional structured, and permeable fabric and a lower permeable fabric, wherein in the dewatering step along a Entskyss mecanicsumble pressure on the upper fabric, the tissue paper web and the lower clothing is applied.
  • the tissue paper web is dewatered in the direction of the lower clothing and through the lower clothing.
  • the pressure exerted here on the arrangement of structured and permeable covering, tissue paper web and lower permeable covering can be effected by a gas flow. Additionally or alternatively, the pressure exerted can be effected by a mechanical pressing force.
  • tissue paper web In order to compress the tissue paper web only partially by the action of pressure and thus to provide a tissue paper with regions - in the unpressed or less pressed areas - high volume for good absorbency and with areas - in the more compressed areas - high strength, it makes sense when the side of the structured fabric facing the tissue paper web comprises recessed regions and elevated regions relative to the recessed regions. As a result, as already mentioned, the tissue paper web is less strongly compressed in the recessed areas than in the raised areas.
  • the upper structured and permeable fabric is preferably a 3-dimensionally structured sieve, in particular TAD sieve, and the lower permeable clothing is preferably a press felt with a sufficiently high water absorption capacity for the water pressed out of the tissue paper web.
  • the structure of the lower clothing is on the PCT / EP2005 / 050198 referred to in full in this application.
  • the structured sieve in the dewatering step is the same sieve as that in the formation of the tissue paper web.
  • the voluminous pillow-like portions of the tissue paper web will remain in the recessed areas of the textured screen in which they were formed, thereby largely protecting the bulky portions from pressure and exerting much less pressure on them than those therebetween lying sections of the tissue paper web.
  • the bulky structure of the pillow-like portions therefore remains in the dewatering step.
  • the structured sieve in the dewatering step is the same sieve as that in the other drying step. This saves a transfer of the tissue paper web from the structured sieve in the dewatering step onto the structured sieve for the other drying step, thereby protecting the bulky pillow-like portions of the tissue paper web by the same recessed regions of the structured sieve in the other drying step and in the dewatering step.
  • the compressibility (thickness change in mm when force is applied in N) of the upper clothing is smaller than the compressibility of the lower clothing. This leaves the voluminous structure of the tissue paper web at the Pressure received.
  • the dynamic stiffness (K) as a measure of the compressibility of the lower fabric 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 lower clothing is 2N / mm 2 or more, preferably 4N / mm 2 or more.
  • the water stored in the lower clothing for example the press felt
  • the permeability of the lower clothing 80cfm or less, preferably 40cfm or less, more preferably 25cfm or less. In the areas mentioned above, rewetting of the tissue paper web by the lower clothing is largely prevented.
  • the dewatering step first the upper fabric then the tissue paper web and then the lower fabric is traversed by a gas.
  • the dewatering of the paper web takes place in the direction of the lower clothing.
  • the arrangement of upper covering, tissue paper web and lower covering is guided at least in sections along the dewatering section between a tensioned press belt and a smooth surface, wherein the press belt on the upper clothing acts and the lower fabric is supported on the smooth surface.
  • a dewatering of the tissue paper web takes place in the direction of the lower clothing.
  • the arrangement of upper covering, tissue paper web and lower covering is at least partially flowed through in the region of the dewatering section of the gas stream, so that the dewatering takes place simultaneously by the pressing force of the press belt and the flow of the gas.
  • 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 between 50 ° C and 180 ° C, preferably between 120 ° C and 150 ° C and the pressure is less than 0.2bar, preferably less than 0.1bar and more preferably less than 0.05bar ,
  • the gas can be hot air or steam.
  • 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 30 kN / m, preferably at least 60 kN / m or 80 kN / m.
  • 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 an open area between 51% and 62% and a contact surface between 38% and 49% of its total to the upper fabric has facing surface.
  • the above-mentioned press belts may, for example, be press belts with a spiral structure.
  • 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.
  • a press belt is formed, for example, by a woven structure.
  • the smooth surface is preferably formed by the lateral surface of a roller.
  • tissue paper web leaves the dewatering section with a dry content of about 30%.
  • the tissue paper web is guided in a further dewatering step subsequent to the dewatering step together with the structured covering of the dewatering step through a press nip and further dehydrated.
  • tissue paper web in the press nip is preferably arranged between the structured and permeable upper clothing and a, in particular smooth and heated, roller surface, wherein the heated and smooth surface is preferably formed by the jacket surface of a Yankee drying cylinder.
  • tissue paper web on the structured upper clothing ensures that even during this dewatering step the bulky pillow-like sections of the tissue paper are pressed less severely than the intervening sections.
  • the recessed areas and the relatively elevated areas of the structured and permeable clothing are designed and arranged in such a way that only 35% or less, in particular only 25% or less, of the tissue paper web is pressed in the press nip.
  • the 3-dimensional structure of the paper is already formed during the formation.
  • the 3-dimensional structure of the tissue paper is only formed in a subsequent dewatering step by pressing the tissue paper web into a structured screen, thereby forming a substantially two-sidedly waved tissue paper.
  • the formation of the tissue paper between the structured fabric and a forming fabric having a relatively smooth surface forms a tissue paper web which is substantially smooth on the side formed on the smooth forming fabric.
  • this side comes into contact with the surface of the Yankee dryer cylinder, which due to the relatively large contact surface -this is in the formation of the tissue paper web between the three-dimensionally structured sieve and the Formierieb and at their subsequent dewatering between the three-dimensionally structured sieve and the press felt 90% or more, depending on the process conditions often even nearly 100%, the total area of this side compared to the prior art -here the contact area is only about 25% of the total area of this page burning of the tissue paper web at high temperatures of the lateral surface of the Yankee drying cylinder is prevented. This can increase the temperature of the Yankee drying cylinder compared to the prior art which results in a higher dry content of the tissue paper web produced.
  • the press nip For a gentle pressing in the press nip, it makes sense if the press nip is a shoe press nip.
  • the tissue paper web In order to remove water which is carried along in the structured upper clothing and which impedes dewatering in the press nip, it is expedient for the tissue paper web to be guided together with the structured clothing around an evacuated deflection roller, the structured clothing between the tissue paper web and the paper web sucked deflecting roller is arranged.
  • Figures 1, 2 and 3 show embodiments of different devices for carrying out the method according to the invention.
  • a stock suspension 1 emerges from a headbox 2 in such a way that it is injected into the incoming gap between a forming fabric 3 and a structured, in particular 3-dimensionally structured, sieve 4, whereby a tissue paper web 5 is formed.
  • the forming fabric 3 has a side facing the tissue paper web 5 that is smooth relative to that of the structured fabric 4.
  • the side 6 of the structured screen 4 facing the tissue paper web 5 has recessed regions 7 and elevated regions 8 relative to the recessed regions 7, so that the tissue paper web 5 is formed in the recessed regions 7 and the raised regions 8 of the structured sieve 4.
  • the height difference between the recessed areas 7 and the raised areas 8 is preferably 0.07 mm and 0.6 mm.
  • the area formed by the raised areas 7 is preferably 10% or more, more preferably 20% or more, and most preferably 25% to 30%.
  • the structured sieve 4 is formed as a TAD sieve 4.
  • the arrangement of TAD screen 4, tissue paper web 5 and forming fabric 3 is guided around a forming roller 9 and the tissue paper web 5 is substantially dewatered through the forming fabric 3 before the forming fabric 3 is removed from the tissue paper web 5 and the tissue paper web 5 is further transported on the TAD screen 4.
  • FIG. 5 shows the structure of the tissue paper web 5 formed between the flat forming fabric 3 and the TAD wire 4.
  • the voluminous pillow-like portions C 'of the tissue paper web 5 formed in the recessed areas 7 of the TAD sieve 4 have a higher volume and a higher basis weight than the sections A' of the tissue paper web 5 formed in the raised areas 8 of the TAD sieve 4.
  • the tissue paper web 5 therefore already has a 3-dimensional structure due to its formation on the structured sieve 4.
  • FIG. 6 shows a tissue paper web 105 which has been formed between two smooth forming fabrics 103 and 103 '.
  • the tissue paper web 105 is formed due to their formation between two smooth Formiersieben 103 and 103 'substantially smooth and without 3-dimentionale structure.
  • the fibers are pressed in the direction of the flat press felt 9, whereby the adjacent to the press felt 9 side of the tissue paper web 5 is even flatter.
  • the tissue paper web 5 is dewatered in the direction of the press felt 9 during this dewatering step and in that the tissue paper web 5 is dewatered on the structured wire 4 on which it has already been formed, the voluminous sections C 'are compressed less than the sections A'. so that, as a result, the bulky structure of the sections C 'is maintained.
  • FIG. 8 shows the generation of a 3-dimensional structure of the tissue paper web 105 formed in FIG.
  • the tissue paper web 105 must be pressed into a structured screen 104.
  • the tissue paper web 105 is stretched in the sections C which are pressed into the recessed areas 107 of the structured mesh 104, which reduces the weight per unit area in the sections C.
  • the tissue paper web 105 is strongly pressed in the sections C, so that the volume of the sections C is also reduced.
  • the pressure for dewatering the tissue paper web 5 at the dewatering step is partially generated simultaneously in sections by a gas flow and by a mechanical pressing force.
  • the gas stream flows through first the structured sieve 4 then the tissue paper web 5 and then the formed as a press felt 9 lower fabric.
  • the gas flow through the tissue paper web 5 is about 150m 3 per minute and meter web length.
  • the gas flow is generated by a suction zone 11 in a roller 12, wherein the suction zone 11 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 11 is between -0.2bar and -0.8bar, preferably between -0.4bar and -0.6bar.
  • the mechanical pressing force is generated by the fact that in the dewatering step, the arrangement of structured sieve 4, tissue paper web 5 and press felt 9 a dewatering 1 s 3 between a tensioned press belt 14 and a smooth surface 15 is guided, wherein the press belt 14 on the structured Sieve 4 acts and the press felt 9 is supported on the smooth surface 15.
  • the smooth surface 15 is in this case formed by the lateral surface 15 of the roller 12.
  • the dewatering section 13 is essentially defined by the wrap area of the press belt 14 around the lateral surface 15 of the roller 12, wherein the wrap is determined by the distance between the two guide rollers 16 and 17.
  • the press belt 14 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 14 is formed as a spiral link fabric and an open area between 51% and 62% and a contact area between 38% and 49% of its total surface facing the upper clothing.
  • the tissue paper web 5 leaves the dewatering section 13 with a dry content of about 30%.
  • the tissue paper web 5 is subjected to a drying step in which it is guided by the structured sieve 4 via a first heated surface 18 and subsequently via a second heated surface 19.
  • the contact area between the two heated surfaces 18 and 19 is often almost 100% of the Total area of the side facing the heated surfaces 18 and 19 of the tissue paper web. 5
  • the first heated surface 18 is in this case by the lateral surface 18 of a first steam-heated drying cylinder 20 and the second heated surface 19 through the lateral surface 19 of a second steam-heated drying cylinder 21st formed, wherein both lateral surfaces 18 and 19 are wrapped for the greater part of the structured sieve 4.
  • the two drying cylinders each have a diameter of approx. 1.8m.
  • these are advantageously coated with tungsten carbide and / or with Teflon.
  • a steam blower box 22 is arranged, through which steam of approximately 8 bar is directed through the structured sieve 4 onto the tissue paper web 5.
  • tissue paper web 5 has been formed between the structured sieve 4 and the relatively smooth forming fabric 3
  • only the side of the tissue paper web 5 formed on the structured sieve 4 has a wavy surface, whereas the surface formed on the smooth forming fabric 3 is relatively smooth is. Therefore, the tissue paper web 5 comes in the drying step with a large surface on the two lateral surfaces 18 and 19 of the drying cylinders 20 and 21 in contact, whereby a high dry content of about 39% or more can be achieved (Figure 9).
  • the tissue paper web 5 is guided in a further dewatering step together with the structured sieve 4 through a press nip 24, wherein the tissue paper web 5 is arranged in the press nip 24 between the structured sieve 4 and a smooth roll surface 25 of a Yankee drying cylinder 26.
  • the press nip 24 is a through the Yankee drying cylinder 26 and a shoe press 27 formed shoe press nip.
  • the tissue paper web 5 in this case rests on the side formed on the flat forming fabric 3 with a relatively large area on the lateral surface 25 of the Yankee drying cylinder 26, the tissue paper web 5 resting on the structured sieve 4 on the other side.
  • the recessed areas 7 and the relatively elevated areas 8 of the structured screen 4 are in this case designed and arranged relative to one another such that the pillow-like sections C 'in the press nip 24 are substantially not pressed, this being 65% or less, in particular 75% or less the tissue paper web 5.
  • the sections A ' are pressed, whereby the strength of the tissue paper web 5 is further increased (Figure 11).
  • the tissue paper web 105 known from the prior art comes compared to the tissue paper web 5 with a relatively small contact area -ca. 25% of the area of the side of the tissue paper web 105 leading to the Yankee dryer cylinder abuts the jacket surface 125 of the Yankee dryer cylinder.
  • the contact area between the jacket surface 25 of the Yankee drying cylinder 26 and the side of the tissue paper web 5 facing this is 90% or more, often nearly 100%, of the total area of this side of the tissue paper web 5.
  • the structured sieve 4 Before the tissue paper web 5 passes through the press nip 24, it will collapse with the structured sieve 4 is guided around an evacuated deflection roller 23, wherein the structured sieve 4 is arranged between the tissue paper web 5 and the evacuated deflection roller 23.
  • the tissue paper web 5 is passed over the heated jacket surface 25 of the Yankee drying cylinder 26 and then removed from it with a crep scraper (shown only in FIG. 3).
  • a drying hood 28 may additionally be arranged above the Yankee drying cylinder 26 in such a way that the tissue paper web 5 is guided between the drying hood 28 and the lateral surface 25 of the Yankee drying cylinder 26.
  • the gas flow can be additionally produced by means of an overpressure element 29 arranged above the structured sieve 4, the dewatering step in this case taking place without mechanical pressing force, i.
  • an overpressure element 29 arranged above the structured sieve 4, the dewatering step in this case taking place without mechanical pressing force, i.
  • no press belt 14 is provided which wraps around the roller 12 in sections.
  • the tissue paper web 5 contrary to the devices according to FIGS. 1 or 2, is not formed between a structured sieve and a forming fabric but between two smooth forming fabrics 3 and 30.
  • the further process steps that can be carried out with the device of FIG. 3 for dewatering and for drying the tissue paper web 5 essentially correspond to those from FIG. 1.
  • tissue paper web 5 After the formation of the tissue paper web 5, this is transferred from the forming fabric 30 by means of a vacuum device 31 onto a three-dimensionally structured sieve 32.
  • the tissue paper web 5 is placed between the structured wire 30 which is located at the top is and the press felt 9 out, wherein in the dewatering step along the Entskyss mecanicsddle pressure on the structured wire 30, the tissue paper web 5 and the press felt 9 is applied such that the tissue paper web 5 is dewatered in the direction of the press felt 9.
  • the pressure for dewatering the tissue paper web 5 is generated in the dewatering step at least in sections simultaneously by a gas flow and by a mechanical pressing force.
  • the mechanical pressing force is generated in this case by the pressurized press belt 14.
  • the tissue paper web 5 is subjected to the drying step, in which it is guided by the structured wire 30, over the first heated surface 18 and subsequently over the second heated surface 19.
  • the tissue paper web 5 is guided through the press nip 24 in the further dewatering step together with the structured wire 30, the tissue paper web 5 being arranged in the press nip 24 between the structured wire 30 and the smooth roller surface 25 of the Yankee drying cylinder 26.
  • the press nip 24 is a shoe press nip formed by the Yankee drying cylinder 26 and the shoe press 27.
  • tissue paper web 5 is guided on the lateral surface 25 of the Yankee drying cylinder 26 and subsequently creped from it by means of a crep scraper 33.

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EP06114209A 2005-08-18 2006-05-19 Procédé de fabrication de papier tissu Withdrawn EP1754824A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005039015A DE102005039015A1 (de) 2005-08-18 2005-08-18 Verfahren zur Herstellung von Tissuepapier

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Publication Number Publication Date
EP1754824A1 true EP1754824A1 (fr) 2007-02-21

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US7850820B2 (en) 2010-12-14

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