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WO2009067079A1 - Courroie de structure, section de presse et machine de fabrication de papier mince pour fabriquer une bande de papier mince crêpé très bouffant, et procédé associé - Google Patents

Courroie de structure, section de presse et machine de fabrication de papier mince pour fabriquer une bande de papier mince crêpé très bouffant, et procédé associé Download PDF

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Publication number
WO2009067079A1
WO2009067079A1 PCT/SE2008/051332 SE2008051332W WO2009067079A1 WO 2009067079 A1 WO2009067079 A1 WO 2009067079A1 SE 2008051332 W SE2008051332 W SE 2008051332W WO 2009067079 A1 WO2009067079 A1 WO 2009067079A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
structuring
tissue
forming
belt
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.)
Ceased
Application number
PCT/SE2008/051332
Other languages
English (en)
Inventor
Ingvar Klerelid
Ola Thomasson
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.)
Valmet AB
Original Assignee
Metso Paper Karlstad AB
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
Priority claimed from SE0702543A external-priority patent/SE531891C2/sv
Priority to EP08851985.5A priority Critical patent/EP2229478B1/fr
Priority to ES08851985.5T priority patent/ES2665008T3/es
Priority to MX2010005498A priority patent/MX2010005498A/es
Priority to CA2706323A priority patent/CA2706323C/fr
Priority to CN200880124876.XA priority patent/CN101952506B/zh
Priority to KR1020107013654A priority patent/KR101663016B1/ko
Priority to AU2008326861A priority patent/AU2008326861A1/en
Priority to RU2010120644/12A priority patent/RU2519930C2/ru
Priority to JP2010534915A priority patent/JP5504169B2/ja
Application filed by Metso Paper Karlstad AB filed Critical Metso Paper Karlstad AB
Priority to BRPI0820618-0A priority patent/BRPI0820618B1/pt
Publication of WO2009067079A1 publication Critical patent/WO2009067079A1/fr
Priority to US12/561,840 priority patent/US8216427B2/en
Anticipated expiration legal-status Critical
Priority to US13/544,603 priority patent/US8366878B2/en
Ceased legal-status Critical Current

Links

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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • 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
    • 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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/02—Patterned paper

Definitions

  • Structuring belt, press section and tissue papermaking machine for manufacturing a high bulk creped tissue paper web and method therefor
  • This invention relates to a structuring layer according to the preamble of claim 1 and to a structuring belt according to the preamble of claim 10.
  • the invention also relates to a press section according to the preamble of claim 15 and to a tissue papermaking machine according to the preamble of claim 18.
  • the invention also relates to a method of manufacturing a structured high bulk tissue paper web and to such a high bulk tissue paper web.
  • the invention relates furthermore to a method of converting or upgrading an existing tissue papermaking machine.
  • tissue paper refers to soft paper with a basis weight usually of less than 25 g/m 2 . Tissue paper web forms a base paper for certain single-ply and multi-ply products, e.g. napkins, towels and toilet rolls.
  • Tissue manufacturers wish to produce products with high bulk and softness. At the same time the energy costs for the process is important.
  • Paper making machines which use the pressing technique to dewater and simultaneously structure the paper web with the aid of a structuring clothing have been proposed.
  • This dewatering and structuring occurs in one or more press nips while the paper web is transferred from the felt to the structuring clothing.
  • the structuring clothing then carries the paper web to the Yankee cylinder, where it is transferred with the aid of a press roll which only ensures the transfer of the paper web.
  • Structuring clothings of this kind may be belts or fabrics.
  • the present invention relates to a structuring belt, i.e. a non-woven structuring clothing. This means that 3D patterns are created, not by the woven structure, but by other means.
  • the bulk of the paper is maintained in that cavities in the structure of the belt receive the fibrous network and prevent compression of the fibrous network during dewatering in the press nip.
  • structural of the paper refers to the fact that a three-dimensional pattern of the structuring layer is embossed into the wet fibrous web during a pressing process when the fibrous network structure fills the three-dimensional pattern of the structuring belt and that fibres in the wet fibrous web are movable relative to each other so that they are advantageously brought to new positions and directions relative to each other by the action of the elastically compressible press felt, which presses the wet fibrous web into the three-dimensional pattern of the structuring belt, and this altogether contributes to an increased bulk and softness with the same basis weight, and to an improved structure.
  • tissue papermaking machines provided with embossing or structuring clothings are EP 1 078 126, EP 0 526 592, US 6,743,339, EP 1 075 567, EP 1 040 223, US 5,393,384, EP 1 036 880 and US 5,230,776.
  • the present inventors have realised that the structure of the structuring layer of the structuring belt in contact with the web during the pressing process has great and probably crucial importance from the point of view of being able to achieve a tissue paper with a higher bulk than that possible hitherto in a papermaking machine using the pressing technique and that the structure of this layer of the structuring belt can also be used as a parameter for controlling slip properties of the web after the nip and for achieving a high dryness of the web in connection with the pressing in the press section in which the actual structuring of the wet fibrous web occurs.
  • the object of the invention is to make it possible to manufacture a tissue paper web with a bulk of at least 8-20 cm 3 /g, e.g. at least 10-16 cm 3 /g, said bulk being comparable to that of TAD paper, that is 12-20 cm 3 /g, using the pressing technique and with low energy costs.
  • conventional tissue paper manufactured by the pressing technique normally has a bulk in the range of 5-9 cm 3 /g.
  • the low energy costs are achieved in that the use of the structuring belt according to the invention gives a high dryness of the fibrous web after the press section, said dryness being in the range of 40-50 %.
  • the high dryness in turn means that a smaller quantity of water has to be evaporated from the drying surface in the subsequent drying stage, which in turn means an energy saving.
  • the energy-intensive TAD technique for removing water from the fibrous web can thus be avoided.
  • tissue paper web can be rewound into finished products consisting of a plurality of paper layers, such as sanitary paper, napkins, towels and toilet paper.
  • finished products consisting of a plurality of paper layers, such as sanitary paper, napkins, towels and toilet paper.
  • the quality of these products is determined, inter alia, by the absorption capacity of the products and by how soft consumers find the products.
  • Figures 1 to 10 show ten different tissue papermaking machines with a structuring belt according to the invention.
  • Figure 11 shows a structuring belt according to a first embodiment of the invention.
  • Figure 12 is a section through the structuring belt according to Figure 11.
  • Figure 13 shows a structuring layer of a structuring belt according to a second embodiment of the invention.
  • Figure 14 shows a structuring layer of a structuring belt according to a third embodiment of the invention.
  • Figure 15 shows a structuring layer according to a fourth embodiment of the invention.
  • Figure 16 shows a structuring layer according to a fifth embodiment of the invention.
  • Figure 17 is a section of a tissue paper web manufactured by a tissue papermaking machine according to the invention.
  • Figure 18 is a top view of a tissue paper web manufactured by a tissue papermaking machine according to the invention.
  • FIGS 1-10 show schematically different embodiments of a tissue papermaking machine for manufacturing a tissue paper web 1 structured by means of pressing without the use of through air drying (TAD) for preliminary dewatering according to the present invention.
  • TAD through air drying
  • Common to the different embodiments is the fact that they comprise a wet section 2 for forming a continuous paper web, a press section 3 for dewatering and structuring the web and a drying section 4 for final drying of the web.
  • the wet section 2 of each tissue papermaking machine comprises a forming section 5 including a headbox 6 feeding a stock of fibres and water to a forming clothing, a forming roll 7 enclosed by a forming clothing for partial dewatering of the web, and a first forming clothing 8 running about and in contact with the forming roll 7 and carrying the paper web.
  • the forming section 5 also has a second forming clothing 9, that is a fabric, running in an endless loop about a plurality of guide rolls 10 and about the forming roll 7 in contact with the first clothing 8 so as to receive a stock jet from the headbox 6 between it and the first clothing, after which the stock is dewatered through the clothing 9 for the forming of a formed fibrous web 1 '.
  • a second forming clothing 9 that is a fabric, running in an endless loop about a plurality of guide rolls 10 and about the forming roll 7 in contact with the first clothing 8 so as to receive a stock jet from the headbox 6 between it and the first clothing, after which the stock is dewatered through the clothing 9 for the forming of a formed fibrous web 1 '.
  • the press section 3 comprises a main press 11 including a first press element 12 and a second press element 13 which cooperate with each other to form a press nip Nl between them.
  • the main press 11 may be a roll press, a long nip press or a shoe press (not shown in the figures).
  • the press section 3 furthermore comprises a structuring belt 14 running in an endless loop about a plurality of guide rolls 15, about a smooth transfer roll 16 located in connection to the drying section 4, and through the press nip Nl of the main press 11 together and in contact with the formed fibrous web 1 ' in order to provide for dewatering and structuring of the formed fibrous web 1 ' when it passes through the press nip Nl so that a structured fibrous web 1 " will leave the press nip Nl .
  • a structuring belt 14 running in an endless loop about a plurality of guide rolls 15, about a smooth transfer roll 16 located in connection to the drying section 4, and through the press nip Nl of the main press 11 together and in contact with the formed fibrous web 1 ' in order to provide for dewatering and structuring of the formed fibrous web 1 ' when it passes through the press nip Nl so that a structured fibrous web 1 " will leave the press nip Nl .
  • the structured fibrous web 1 " is carried by the structuring belt 14 up to a transfer nip N2 between the transfer roll 16 and a drying cylinder 19 of the drying section 4, no pressing or dewatering taking place in the said nip N2, but only the transfer of the fibrous web 1" to the surface of the drying cylinder 19.
  • the drying cylinder 19 is a Yankee cylinder, but other types of drying sections are possible.
  • the press section 3 furthermore comprises a water-receiving press felt 17 elastically formable and compressible in the z-direction, running in an endless loop about a plurality of guide rolls 18 and through the press nip Nl of the main press 11 together with the structuring belt 14 and in contact with the formed fibrous web 1'.
  • the first press element 12 is located in the loop of the structuring belt 14 and the second press element 13 is located in the loop of the second press felt 17.
  • both press elements 12, 13 are press rolls, but they are alternatively rolls forming a long nip.
  • the press felt 17 leaves the structured fibrous web 1 " immediately after it has passed through the press nip Nl in order to prevent rewetting of the fibrous web 1".
  • a spray device 53 is arranged on the inside of the press felt 17 for supplying fresh water to the wedge-shaped narrowing space between the press felt 17 and the guide roll 18, said water being pressed into the press felt 17 and displaces the contaminated water in the press felt 17 after pressing in the main press 11 through and out of the press felt 17 when this runs about the guide roll 18.
  • suction boxes 54 are arranged on the outside of the press felt in order to withdraw water out from the press felt.
  • the structuring belt 14 passes through a cleaning station 30 for cleaning the web-contacting surface.
  • the fibrous web 1', 1" is brought from a dryness in the range of 15-30 % to a dryness in the range of 42-52 %.
  • the drying section 4 comprises said drying cylinder 19, which, in the embodiments shown, is the only drying cylinder, advantageously a Yankee drying cylinder. Alternatively, the drying section may consist of a plurality of drying cylinders or drying belts made of metal.
  • the drying cylinder 19 with which the transfer roll 16 forms the said transfer nip N2 has a drying surface 20 for drying the structured fibrous web 1 ".
  • a creping doctor 21 is arranged downstream of the drying surface 20 in order to crepe the dried fibrous web 1 " from the drying surface 20 in order to obtain the tissue paper web 1 which is both structured and creped.
  • the drying cylinder 19 is covered by a hood 22.
  • the structuring belt 14 and the structured fibrous web 1 " run together through the transfer nip N2, but leave the transfer nip N2 separately in that the structured fibrous web 1 " adheres to and is transferred to the drying surface 20 of the drying cylinder 19.
  • the pressure in the transfer nip N2 formed by the roll 16 and the drying cylinder 19 is less than 1 MPa and no dewatering of the fibrous web 1" occurs in this nip.
  • an adhesive is advantageously applied to the drying surface 20 by means of a spray device 23 at a point between the creping doctor 21 and the transfer nip N2 where the drying surface 20 is free.
  • the forming section 5 may be a so-called C-former, as shown in Figures 1, 2, 7 and 8, or a so-called Crescent former, as shown in Figures 3-6, or a so-called suction breast roll former, as shown in Figures 9 and 10.
  • the main press 11 may be a roll press in which the two press elements 12, 13 are rolls with smooth mantle surfaces, or preferably a long nip press, e.g. a shoe press, in which the first press element 12 is a smooth counter roll and the second press element 13 comprises a press shoe and an endless belt or a jacket running through the press nip of the shoe press in sliding contact with the press shoe, which exerts a predetermined pressure on the inside of the belt and on the counter roll 12.
  • the press shoe thus constitutes a device forming an extended press nip.
  • the first press element 12 is a smooth counter roll and the second press element comprises a device for forming an extended press nip, said device including an elastic support body arranged to press in the direction towards the counter roll.
  • the press element 13 is a smooth counter roll, while the second press element 12 comprises a device forming an extended nip of any one of the types known in paper making.
  • the press felt 17 of the main press is also used as the first inner forming clothing 8 of the forming section 5 so that the forming roll 7 is also located within the loop of the press felt 17.
  • the wet section 2 in this case also comprises a predewatering device 24, namely a suction device.
  • the device 24 comprises a suction roll 25 located within the loop of the press felt 17, and a steam box 26 located on the outside of the loop of the press felt 17 in front of the suction roll 25 for heating the water in the fibrous network of the formed fibrous web 1 '.
  • a high-pressure spray device 55 that is a needle-type spray device with a jet diameter of 1 mm, is arranged on the outside of the forming felt 8 upstream of the forming roll 7 in order to clean the forming felt 8 before it reaches the forming roll 7.
  • the embodiment according to Figure 2 is similar to that of Figure 1 , except that it is additionally provided with a preheating device 27 downstream of the main press 11 in order to increase the temperature of the structured fibrous web 1" in the press 11 before the fibrous web 1" reaches the drying cylinder 19.
  • the structuring belt 14 is also used as the first inner forming clothing 8 of the forming section so that the forming roll 7 is also located within and surrounded by the loop of the structuring belt 14.
  • the press felt 17 of the main press 11 runs in a single loop about a plurality of guide rolls 28 and the second press element 13.
  • the guide roll located upstream of the second press element 13 is a suction roll 29 by means of which water is removed from the press felt 17 in order to increase the capacity of the press felt 17 to dispose of relatively large quantities of water pressed out in the nip Nl .
  • One special effect with this embodiment, in which the structuring belt 14 also passes about the forming roll 7, is that it will be possible for the fibres of the stock to penetrate into and orient themselves in the z-direction in the depressions of the structuring belt 14 so that some of the formed fibrous web 1' is already oriented in the depressions before pressing is started in the main press 11. Such a pre-orientation of fibres in the depressions is therefore advantageous in order to provide higher bulk.
  • a spray device 53 is arranged on the inside of the press felt 17 for supplying fresh water into the wedge-shaped tapering space between the press felt 17 and the guide roll 28, said water being pressed into the press felt 17 and displaces the contaminated water in the press felt 17 after pressing in the main press 11 through and out of the press felt 17 when this runs about the guide roll 28.
  • suction boxes 54 are arranged on the outside of the press felt 17 in order to withdraw water out from the press felt 17, as well as a high-pressure spray device 55 which cleans the press felt 17 before it arrives at the suction roll 29, which deals with the remaining water in the press felt 17.
  • the suction roll 29 removes water from the press felt 17 and thus increases the capacity of the press felt to absorb the water in the nip Nl .
  • the embodiment according to Figure 4 is similar to that of Figure 3, except that it is additionally provided with a preheating device 27 corresponding to the embodiment according to Figure 2 and that a steam box 31 is arranged on the outside of the press felt 17 immediately in front of the suction roll 29 in order to increase the de watering capacity thereof.
  • the first inner forming clothing 8, the press felt 17 and the structuring belt 14 have their own loops, wherein the forming clothing 8 is a felt running about a plurality of guide rolls 18'.
  • the press section 3 in this case comprises a prepress 32 including a first press element 33 located within the loop of the press felt 17 and a second press element 34 located within the first inner forming clothing 8, said press elements 33, 34 forming a press nip N3 with each other through which the forming felt 8 carrying the fibrous web 1 ' runs in order to meet the press felt 17 which also runs through the said press nip N3 in order to receive the formed fibrous web 1 ' and carry it on to the main press 11.
  • the forming felt 8 thus also forms the second press felt of the pre-press 32.
  • the guide roll located immediately upstream of the second press element 34 is a suction roll 35 by means of which water is removed from the forming felt 8.
  • a steam box 36 is located on the outside of the forming felt 8 immediately in front of the suction roll 35 in order to make the dewatering of the felt 8 more effective.
  • a spray device 53' is arranged on the inside of the forming felt 8 for supplying fresh water into the wedge-shaped tapering space between the forming felt 8 and the guide roll 18', said water being pressed into the forming felt 8 and displaces the contaminated water in the forming felt 8 after pressing in the pre-press 32 through and out of the forming felt 8 when this runs about the guide roll 18'.
  • suction boxes 54' are arranged on the outside of the forming felt 8 in order to withdraw water out from the press felt 8, as well as a high-pressure spray device 55' which cleans the forming felt 8 before it reaches the forming roll 7.
  • the embodiment according to Figure 6 is similar to that of Figure 5, except that it is additionally provided with a preheating device 27 corresponding to the embodiment according to Figure 2.
  • the first inner forming clothing 8, that is a forming fabric, the press felt 17 and the structuring belt 14 have their own loops as in the embodiment according to Figure 5.
  • the forming section 5 is thus a twin- wire C-former.
  • the forming roll 7 may be a suction roll if desired.
  • the press section 3 in this case also comprises a pre-press 32 including a first press element 33 located within the loop of the press felt 17 and a second press element 34 located within a second press felt 37 running in a loop about a plurality of guide rolls 38, wherein the guide roll located immediately upstream of the second press element 34 is a suction roll 39 by means of which water is removed from the second press felt 37.
  • a steam box 50 is located on the outside of the second press felt 37 immediately in front of the suction roll 39 in order to improve dewatering of the press felt 37.
  • the second press felt 37 runs in contact with the first inner forming fabric 8 in order to form a transfer zone in which the press felt 37, the formed fibrous web 1 ' and the forming fabric 8 form a sandwich structure.
  • a suction device 51 may be located within the loop of the second press felt 37 after the transfer zone in order to ensure the transfer of the fibrous web 1 '.
  • a spray device 53' is arranged on the inside of the press felt 37 for supplying fresh water into the wedge-shaped tapering space between the press felt 37 and the guide roll 38, said water being pressed into the press felt 37 and displaces the contaminated water in the press felt 37 after pressing in the pre-press 32 through and out of the press felt 37 when this runs about the guide roll 38.
  • suction boxes 54' are arranged on the outside of the press felt 37 in order to withdraw water out from the press felt 37, as well as a high-pressure spray device 55' which cleans the press felt 37 before it reaches the suction device 51.
  • the embodiment according to Figure 8 is similar to that of Figure 7, except that it is additionally provided with a preheating device 27 after the main press corresponding to the embodiment according to Figure 2 in order to increase the temperature and dryness of the paper web 1 ".
  • the embodiment according to Figure 9 is similar to that of Figure 7 except for the wet section 2 which in this case has a forming section of a type other than C-former and Crescent former as mentioned previously.
  • the forming section according to Figure 9 is a so-called suction breast roll former including a headbox 6, a forming roll 7, that is a suction breast roll, and a forming clothing 8, that is a forming fabric, running in a loop about the suction breast roll 7 and guide rolls 18 and forming a transfer zone with the second press felt 37 corresponding to the embodiment according to Figure 7.
  • the suction breast roll 7 has a suction zone 52 forming a forming zone across which the forming fabric 8 passes together with stock emitted in a jet from the headbox 6 and de watered within the forming zone 52 in order to form a formed fibrous web 1 '.
  • the embodiment according to Figure 10 is similar to that of Figure 9, except that it is additionally provided with a preheating device 27 corresponding to the embodiment according to Figure 2.
  • the pre-press 32 used in the embodiments according to Figures 5-10 may be a press selected from the group of different presses described above in connection with the main press 11.
  • the structuring belt 14 comprises a structuring layer 60 forming the side of the structuring belt carrying the paper web.
  • the layer 60 has a web-contacting surface 61 with a three-dimensional structure formed by the depressions 63 in the form of recesses or pockets in the otherwise flat web-contacting surface 61, said depressions 63 being regularly recurrent and distributed in the longitudinal direction (MD) and cross direction (CD) of the structuring belt.
  • the web-contacting surface 61 thus has a flat, continuous top surface area 70 in which said depressions 63 are formed. Each depression 63 in the web-contacting surface 61 is thus delimited by said continuous surface area 70.
  • further patterns in the form of figures or text may be formed in the structuring layer 60.
  • All of the depressions 63 are preferably identical and are arranged in a regular pattern.
  • one and the same structuring belt may comprise two or more groups of depressions, wherein the design of the depressions in the different groups differs, but the depressions within each group are identical.
  • the form and extent of the depressions 63 is very important with respect to the runnability of the tissue machine and its ability to produce a tissue paper web of good quality, i.e. high bulk of 8-20 cm 3 /g and high softness.
  • the structuring belt 14 allows the wet fibrous web 1' to be formed into the depressions 63 when the fibrous web 1' passes through the press nip Nl together with the press felt 17 and the structuring belt 14 with the wet fibrous web 1' enclosed therebetween.
  • the press felt 17 can reach down into all of the depressions 63 during the pressing process in order to build up a sufficiently high hydraulic pressure so that water in the wet fibrous web 1 ' can move into the press felt 17 and not remain in the fibrous web at the end of the pressing operation.
  • the depressions 63 must be sufficiently large to allow the press felt 17 to penetrate into the depressions 63.
  • Each depression 63 must have an optimum depth which allows water in the bottom of the depression 63 to be transported away. In other words, the depth of the depression 63 must not be too great, as an excessive depth will prevent the desired hydraulic pressure from building up.
  • the structuring layer 60 with this specific well-defined, structured, web-contacting surface 61 is an important parameter for controlling the structure, thickness/bulk and dryness that can be expected in the structured and dewatered fibrous web 1 " after the press nip Nl before final drying. It is taken for granted that the pressure in the press nip Nl is within the normal ranges conventionally used for pressing, normally a maximum of 6 MPa, and that the press felt 17 is of the conventional elastically compressible type, which, in addition to its required water-receiving capacity during compression, forms elastically into the web-contacting surface of the structuring layer with the wet fibrous web located therebetween in the manner and for the purpose specified above.
  • Each depression 63 has a predetermined dimension 1 in the machine direction (MD) of the structuring layer 60 and a predetermined dimension b in the cross direction (CD) of the belt 14.
  • the depressions 63 may be oriented in the machine direction, in which case I > b, or in the cross direction, in which case 1 ⁇ b.
  • the depressions 63 are preferably oriented substantially in the machine direction, as this gives better creping and results in a softer tissue paper. It should be noted here that woven structuring clothings normally have a pattern that is MD-oriented.
  • Each depression 63 also has a predetermined depth d, a predetermined area a and a predetermined volume v.
  • the depth d of the depressions may be constant over substantially all of the depression 63, in which case the depression 63 has a bottom surface 71 which is flat and parallel to the surface area 70.
  • the depth d may alternatively vary over the surface of the depression 63 and then an average depth or mean depth d is preferably used to characterise the extension of the depression 63 in the z-direction.
  • the depressions 63 are arranged at a predetermined distance from each other so that they are distributed in a uniform manner over the web-contacting surface 61 and cover a predetermined part thereof.
  • the abovementioned continuous top surface area 70 which delimits the depressions 63 and constitutes the part of the web-contacting surface 61 cooperating with the drying surface 20 when the fibrous web 1 " is transferred to the drying cylinder 19, constitutes the remaining part of the web-contacting surface 61.
  • a should be measured in the plane of the top surface area 70. However, tests have shown that a should preferably be within the range of 0.5-2.0 mm 2 .
  • the structuring belt 14 is compressed when it passes through the nip Nl between the press elements 12 and 13.
  • the abovementioned range for d applies when the structuring belt 14 and therefore also the depressions 63 are in the compressed state, i.e. when the structuring belt 14 is passing through the nip Nl .
  • the press pressure in this nip has normally a maximum of 6 MPa.
  • the structuring belt 14 is in the compressed state, this refers to the fact that it is loaded with a pressure of a maximum of 6 MPa.
  • the depressions 63 in the non-compressed state can consequently have a depth d greater than 0.6 mm, but in the compressed state, i.e.
  • d should not exceed 0.6 mm.
  • the value d refers to the mean depth of the depression.
  • the greatest depth of the depression exceed 0.6 mm when the depression is in the compressed state.
  • the depressions should altogether cover between 20 % and 80 % of the total web-contacting surface 61.
  • a creped, reeled tissue paper having the following properties can be manufactured in a tissue papermaking machine provided with a structuring belt with a structuring layer as above:
  • Thickness 160-400 ⁇ m preferably 200-300 ⁇ m
  • Softness 70-90 The above values refer to a paper conditioned at 20°C and 50 % atmospheric humidity. The softness value is measured according to EMTEC TSA (Tissue Softness Analyzer) with a measuring scale from 0 to 100. The above bulk and softness values should be compared with those for conventional creped tissue paper, which has a bulk in the range of 5-9 cm /g and a softness in the range of 50-70.
  • tissue paper of the qualities facial i.e. facial tissues, toilet paper and household paper
  • said tissue paper having the following properties:
  • Figure 11 shows a first embodiment of a structuring belt 14 with a structuring layer 60 according to the invention, said structuring layer 60 including reinforcing means 57 and being arranged on a wear layer 58.
  • Figure 12 is a partial view of this belt 14 in a cross section in the machine direction (MD).
  • the web-contacting surface 61 of the structuring layer 60 has a plurality of identical depressions 63 in the form of recesses or pockets, arranged in parallel rows 72, extending in the machine direction of the belt 14. Adjacent rows 72 are displaced by approximately half the length of a pocket relative to each other in the machine direction.
  • Each depression 63 is substantially in the form of a square block with cylindrical ends, said square block extending in the machine direction of the belt 14.
  • each depression 63 is flat and parallel to the continuous top surface area 70.
  • the side walls 73 of the depression 63 form a substantially 90° angle relative to the bottom surface 71 of the pocket.
  • the depressions 63 have a dimension 1 in the machine direction of 2.0 mm and a dimension b in the cross direction of 1.0 mm.
  • the depth d is 0.3 mm.
  • the depressions 63 have an area a in the range of 0.3-4.0 mm 2 , and preferably 0.5-2.0 mm 2 , e.g. approximately 1.8 mm 2 , and a volume v of 0.05-1.0 mm 3 , preferably approximately 0.54 mm 3 .
  • the distance between two adjacent depressions 63 in the machine direction s is approximately 1.0 mm.
  • the distance between two adjacent rows 72 of depressions 63 in the cross direction t is approximately 0.5 mm.
  • the depressions 63 cover approximately 40 % of the web-contacting surface 61.
  • Figure 13 shows a second embodiment of a structuring layer 60 of a structuring belt 14 according to the invention.
  • the structuring layer 60 of the belt 14 has depressions 63 of substantially the same form and arranged in the same manner as the depressions described above.
  • the depressions 63 have a dimension 1 in the machine direction of 1.0 mm, a dimension b in the cross direction of 0.5 mm, a depth d of 0.2 mm, an area a of approximately 0.3-4.0 mm 2 , e.g. 0.45 mm 2 , and a volume v of approximately 0.09 mm 3 .
  • the distance between two adjacent depressions 63 in the machine direction s is 0.5 mm.
  • the distance between two adjacent rows 72 of depressions 63 in the cross direction t is 0.5 mm.
  • Figure 14 shows a third embodiment of a structuring layer according to the invention, said structuring layer also having the depressions 63 of substantially the same form and arranged in the same manner as the depressions described in connection with Figure 11.
  • the depressions 63 are slightly larger than the depressions shown in Figure 13 and have a dimension 1 in the machine direction of 0.5 mm, a dimension b in the cross direction of 1.0 mm, a depth d of 0.4 mm, an area of approximately 1.3 mm 2 and a volume v of approximately 0.51 mm 3 .
  • the distance between two adjacent depressions 63 in the machine direction s is 0.5 mm.
  • the distance between two adjacent rows 72 of depressions 63 in the cross direction t is 0.5 mm.
  • Figure 15 shows a further embodiment of a structuring layer according to the invention.
  • the depressions 63 are formed by recesses or pockets, which, except for rounded inner corners, are substantially entirely rectangular or formed as square blocks.
  • the depressions 63 are arranged in rows 72 extending in the machine direction of the belt 14 and columns 74 extending in the cross direction of the belt 14.
  • the depressions 63 have a dimension 1 in the machine direction of 2.0 mm, an extent b in the cross direction of 2.0 mm, a depth d of 0.2 mm, an area of approximately 3.9 mm 2 and a volume v of approximately 0.79 mm 3 .
  • the distance between two adjacent depressions 63 in the machine direction s is 1.0 mm.
  • the distance between two adjacent rows 72 of depressions 63 in the cross direction t is 1.0 mm.
  • the elevations consequently have a dimension 1 in the machine direction and a dimension b in the cross direction of approximately 1.4 mm in each case.
  • Each elevation 62 has an area a of approximately 0.95 mm 2 and a volume v of approximately 0.19 mm 3 .
  • the distance between adjacent elevations is approximately 0.5 mm and the elevations 62 consequently cover approximately 42 % of the web-contacting surface 61.
  • the upper surface areas 75 of the elevations 62 are preferably flat so that they cooperate with the drying surface 20 when the fibrous web 1 " is transferred to the drying cylinder 19.
  • the structuring layer according to the invention is preferably made of a polymer material, e.g. polyurethane, the depressions 63 or the lower surface area 76 preferably being formed in said structuring layer in that material is cut from the surface of the structuring layer.
  • the structuring layer 60 may alternatively be made of a different material, e.g. metal or carbon fibre, and other techniques may be used to form the depressions or said lower surface area.
  • the structuring layer 60 is preferably approximately 3-6 mm thick, but its thickness may be between 0.2 and 10 mm.
  • the structuring belt is preferably substantially water-impermeable as mentioned for the tissue papermaking machines shown.
  • the structuring belt may be water-permeable.
  • the structuring layer may be needled so that it has through holes.
  • the depressions 63 or the surface area 70 surrounding the depressions, or both, may be needled.
  • the elevations 62 and/or said lower surface area 76 may be needled.
  • the structuring belt 14 may comprise a wear layer 58, e.g. in the form of a felt layer arranged on the side of the structuring belt 14 directed away from the fibrous web 1'.
  • the wear layer 58 may be needled.
  • the structuring belt 14 may comprise reinforcing means 57, e.g. in the form of reinforcement wires arranged within the structuring layer 60.
  • the reinforcing means may alternatively be formed by a metal strip or a fabric arranged within the structuring layer 60.
  • tissue paper web which, after creping from the drying surface 20 and conditioning at 20°C and an air humidity of 50 %, has a basis weight in the range of 10-50 g/m 2 , a thickness in the range of 160-400 ⁇ m, preferably 200-300 ⁇ m, a bulk in the range of 8-20 cm 3 /g, an MD tensile strength in the range of 50-300 N/m, a CD tensile strength in the range of 30-250 N/m and a softness in the range of 70-90 as measured according to EMTEC TSA (Tissue Softness Analyzer) with a measuring scale of 0 to 100.
  • EMTEC TSA tissue Softness Analyzer
  • FIG 17 is a cross section through a tissue paper web 1 manufactured by a structuring belt including depressions according to the invention.
  • the finished tissue paper web 1 has a varying thickness, wherein the thickness of the tissue paper web 1 is greater in those portions 77 in which the tissue paper web 1 has been formed by the top surface area 70 than in those portions 78 in which the tissue paper web 1 has been formed by the depressions 63 of the structuring belt 14.
  • the fibrous web 1 ', 1 " preferably comprises a short-fibre layer and a long-fibre layer, wherein the fibrous web 1 ', 1 " is transferred to the drying surface 20 in the transfer nip N2 with the short-fibre layer directed towards the drying surface 20.
  • the finished tissue paper web 1 thus preferably also has a short-fibre layer on one side 79, i.e. the side which has been in contact with the drying surface 20, and a long-fibre layer on its other side 80, i.e. on the side which has been in contact with the structuring belt 14.
  • Figure 18 shows the long-fibre side 80 of the tissue fibre web 1.

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Abstract

L'invention concerne une couche de structure (60) d'une courroie de structure (14) pour structurer une bande fibreuse humide (1') dans une section de presse (3) d'une machine de fabrication de papier pour fabriquer du papier mince très bouffant (1), ladite couche de structure ayant un côté support de bande avec une surface (61) destinée à coopérer avec la bande fibreuse, ladite surface ayant des creux (63) formant une structure en trois dimensions de la surface. Selon l'invention, les creux sont distribués sur le côté support de bande et constituent ensemble 20 à 80 % de la surface (61), ladite surface comprenant une aire de surface supérieure continue, plate (70) entre les creux (63), ladite aire de surface supérieure délimitant les creux, et chaque creux a une dimension (1) de 0,25 à 2,5 mm dans une première direction dans le plan de l'aire de surface supérieure (70), une dimension (b) de 0,25 à 2,0 mm dans une seconde direction dans le plan de l'aire de surface supérieure (70), lesdites directions étant à des angles droits l'une par rapport à l'autre, une profondeur moyenne (d) de 0,05 à 0,6 mm et une aire (a), telle que mesurée dans le plan de l'aire de surface supérieure (70), de 0,3 à 4,0 mm2. L'invention concerne également une courroie de structure avec une telle couche, une section de presse avec une telle couche de structure, une machine de fabrication de papier mince avec une telle section de presse, un procédé de fabrication d'une bande de papier mince très bouffant dans une telle machine de fabrication de papier mince, et l'utilisation de ladite courroie, ainsi qu'une bande de papier mince produite dans la machine.
PCT/SE2008/051332 2007-11-20 2008-11-20 Courroie de structure, section de presse et machine de fabrication de papier mince pour fabriquer une bande de papier mince crêpé très bouffant, et procédé associé Ceased WO2009067079A1 (fr)

Priority Applications (12)

Application Number Priority Date Filing Date Title
BRPI0820618-0A BRPI0820618B1 (pt) 2007-11-20 2008-11-20 Camada de estruturação, correia de estruturação, seção de prensagem, máquina de produção de papel de tecido, método de fabrico de trama de papel de tecido estruturado de alto volume, método de conversão de seção de prensagem convencional, método de conversão de máquina convencional de produção de papel de tecido, uso de correia de estruturação e trama de papel de tecido
AU2008326861A AU2008326861A1 (en) 2007-11-20 2008-11-20 Structuring belt, press section and tissue papermaking machine for manufacturing a high bulk creped tissue paper web and method therefor
MX2010005498A MX2010005498A (es) 2007-11-20 2008-11-20 Banda de estructuración, sección de prensa y maquina para fabricación de papel de seda para fabricar una red de papel de seda acresponado muy mullido y método para esto.
CA2706323A CA2706323C (fr) 2007-11-20 2008-11-20 Courroie de structure, section de presse et machine de fabrication de papier mince pour fabriquer une bande de papier mince crepe tres bouffant, et procede associe
CN200880124876.XA CN101952506B (zh) 2007-11-20 2008-11-20 用于制造高松厚度皱纹薄页纸纸幅的构造带、压榨部和薄页纸制造机及方法
KR1020107013654A KR101663016B1 (ko) 2007-11-20 2008-11-20 하이 벌크 주름화장지 웹을 제조하기 위한 조직화 벨트, 프레스 구간, 화장지 제지기 및 그 제조방법
RU2010120644/12A RU2519930C2 (ru) 2007-11-20 2008-11-20 Структурирующая лента, прессовая часть и машина для изготовления бумажных салфеток, предназначенные для изготовления полотна для толстых крепированных бумажных салфеток, и соответствующий способ
EP08851985.5A EP2229478B1 (fr) 2007-11-20 2008-11-20 Bande structurante, section de presse et machine de la fabrication de papier de soie très bouffant, et procédés et produit correspondants
JP2010534915A JP5504169B2 (ja) 2007-11-20 2008-11-20 凹凸付けベルト、高バルクなクレープティッシュ紙ウエブ製造用のプレス部分および製紙機械、ならびにその製造方法
ES08851985.5T ES2665008T3 (es) 2007-11-20 2008-11-20 Cinta de estructuración, sección de prensa y máquina de fabricación de papel tisú para la fabricación de una banda de papel tisú de gran densidad y correspondientes métodos y producto
US12/561,840 US8216427B2 (en) 2008-09-17 2009-09-17 Structuring belt, press section and tissue papermaking machine for manufacturing a high bulk creped tissue paper web and method therefor
US13/544,603 US8366878B2 (en) 2008-09-17 2012-07-09 Structuring belt, press section and tissue papermaking machine for manufacturing a high bulk creped tissue paper web and method therefor

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
SE0702543A SE531891C2 (sv) 2007-11-20 2007-11-20 Struktureringsbeklädnad och förfarande för framställning av en tissuepappersbana
SE0702543-0 2007-11-20
US9783708P 2008-09-17 2008-09-17
US61/097,837 2008-09-17
SE0801991-1 2008-09-17
SE0801991A SE532839C2 (sv) 2007-11-20 2008-09-17 Struktureringsband, pressparti och tissuepappersmaskin för framställning av en högbulkkräppad tissuepapersbana och förfarande därför

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/561,840 Continuation US8216427B2 (en) 2008-09-17 2009-09-17 Structuring belt, press section and tissue papermaking machine for manufacturing a high bulk creped tissue paper web and method therefor

Publications (1)

Publication Number Publication Date
WO2009067079A1 true WO2009067079A1 (fr) 2009-05-28

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PCT/SE2008/051332 Ceased WO2009067079A1 (fr) 2007-11-20 2008-11-20 Courroie de structure, section de presse et machine de fabrication de papier mince pour fabriquer une bande de papier mince crêpé très bouffant, et procédé associé

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