WO2000014330A1 - Paper machine for and method of manufacturing structured soft paper - Google Patents

Paper machine for and method of manufacturing structured soft paper Download PDF

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Publication number
WO2000014330A1
WO2000014330A1 PCT/SE1999/001360 SE9901360W WO0014330A1 WO 2000014330 A1 WO2000014330 A1 WO 2000014330A1 SE 9901360 W SE9901360 W SE 9901360W WO 0014330 A1 WO0014330 A1 WO 0014330A1
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WO
WIPO (PCT)
Prior art keywords
fibrous web
clothing
press
web
belt
Prior art date
Application number
PCT/SE1999/001360
Other languages
French (fr)
Inventor
Steven Edwards
Ingvar Klerelid
Anders LINDéN
Original Assignee
Valmet-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
Application filed by Valmet-Karlstad Ab filed Critical Valmet-Karlstad Ab
Priority to EP99968692A priority Critical patent/EP1112408A1/en
Priority to JP2000569061A priority patent/JP2002524669A/en
Publication of WO2000014330A1 publication Critical patent/WO2000014330A1/en

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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
    • D21F11/006—Making patterned paper

Definitions

  • the present invention relates to a paper machine for manufacturing a structured fibrous web of soft paper, comprising:
  • a wet section including a headbox, a forming roll, and inner and outer clothings, which run around the forming roll and between which the fibrous web is formed;
  • a press section including at least one press, having two cooperating press members, one of which being a counter roll, defining a press nip between them, a smooth impermeable belt, and a press felt, wherein the smooth impermeable belt and the press felt run through the press nip with the fibrous web enclosed therebetween;
  • a drying section including a drying cylinder and a transfer roll which, together with the drying cylinder, defines a transfer nip for transfer of the fibrous web to the drying cylinder; and - an endless clothing running in a loop around a suction device, located close to the smooth belt for the creation of a transfer point, and around the transfer roll that defines a nip together with the drying cylinder, which clothing carries the fibrous web from the smooth belt to the drying cylinder.
  • Paper machines for manufacturing soft paper with high bulk are known through a number of patent specifications.
  • a texturing wire or a texturing felt is used, which, together with the formed paper web runs through a press nip, in which the paper web is pressed into the texturing wire and thus acquires a textured pattern on one of its sides.
  • Paper machines with such texturing wires and press nips are described in US-3 , 301, 746, US-3, 537, 954, US-4 , 309 , 246 , US-4 , 533 , 37 , US-5 , 569 , 358 , US-5,591,305 and WO 91/16493 (corresponding to SE-466 063) .
  • the disadvantage with paper machines in accordance with these specifications is that the dewatering in the press nip is relatively low, so that the dry solids content of the paper web is low when the paper web is transferred to the drying cylinder, which results in the output of the paper machine being relatively low.
  • US-4, 849, 054 describes a machine for manufacturing a textured fibrous web with high bulk, where the fibrous web is pressed in a single-clothed roller press having a transfer roll, which, together with a texturing wire, defines a nip at a transfer point for the web.
  • the texturing wire runs around a stationary suction pipe, which has a slot opening facing the nip, which is so wide that the fibrous web is not compressed when it runs through it .
  • the fibrous web is transferred to the texturing wire and formed in accordance with the surface of the texturing wire facing the fibrous web, which surface has a three-dimensional pattern.
  • the fibrous web Before the transfer point, the fibrous web has a speed which is greater than the speed of the texturing wire.
  • the roller that carries the fibrous web up to the non-compressing nip has a smooth surface and it is well known that, in practice, there are problems associated with transferring a fibrous web that has been pre-pressed to a dry solids content of 30-50 per cent from a smooth surface to a wire and retaining it on the wire. If the suction, for any reason, were to stop or be reduced, the fibrous web would continue with the smooth roller, which might result in shut-down and damage to the machine.
  • the wave shape limited to one surface, will completely or mainly be destroyed during the subsequent contacts with different elements, such as drying cylinders and felts, although the stretchability achieved in the fibrous web is retained. In this case also, there are problems associated with transferring the fibrous web to and retaining it on the wire .
  • US-5,411,636 describes the manufacture of soft paper, where the paper web is formed on a forming wire, pre-pressed in a double-felted press nip and transferred to a coarse-meshed wire.
  • the paper web while being carried by the coarse-meshed wire, is subjected to a vacuum in a suction zone so that the paper web is drawn into the openings and depressions of the wire so that the paper web acquires an increased thickness and, thus, increased bulk.
  • the coarse-meshed wire then carries the paper web to the drying cylinder.
  • the double-felted press nip results in the dry solids content of the paper web after the press nip being relatively low, namely 25-30 per cent.
  • the dry solids content of the paper web when it is transferred to the drying cylinder is correspondingly low. Furthermore, it is extremely doubtful that the paper web really is transferred from the felt to the coarse-meshed wire.
  • the purpose of the present invention is to provide an improved paper machine, with which it is possible, without through-blow drying, to re-create at least an essential part of the bulk reduction, which the paper web is subjected to by compression in a roll-press or shoe-press nip, and to manufacture a fibrous web with high bulk and a high dry solids content before the drying cylinder so as to achieve high production at a reasonable cost .
  • the paper machine in accordance with the invention is characterized in that structuring means for structuring the fibrous web are arranged at at least one point downstream of the press section and upstream of the drying section, which structuring means comprise either (A) said clothing, which runs around the transfer roll, in the shape of a permeable wire with a web-contacting structured side, the structure of which is made up of depressions and arched surface parts situated therebetween, said arched surface parts including knuckles in a quantity of 25-150 knuckles per cm 2 , and a suction device that is designed to operate at a vacuum of 40-80 kPa and that is arranged in the loop of the wire and with which the wire is in slidable contact with its side facing away from the web-contacting structured side, the suction device being designed to draw the fibrous web into intimate contact with the structured side of the wire so that the fibrous web is deflecting into said depressions and assumes the structure of the wire, wherein the clothing which carries the structured fibrous web to the drying cylinder, is
  • Figure 1 shows a paper machine in accordance with a first embodiment of the invention.
  • Figure 2 shows a paper machine in accordance with a second embodiment of the invention.
  • Figure 3 shows a paper machine in accordance with a third embodiment of the invention.
  • Figure 4 shows a paper machine in accordance with a fourth embodiment of the invention.
  • Figure 5 shows a paper machine in accordance with a fifth embodiment of the invention.
  • Figure 6 shows, in perspective, a surface part of a wire included in the paper machines in accordance with Figures 1-5.
  • Figure 7 shows a paper machine in accordance with a sixth embodiment of the invention.
  • Figure 8 shows an enlarged view of a creping doctor and a suction shoe, which are included in the paper machine in accordance with Figure 7.
  • Figure 9 shows a paper machine in accordance with a seventh embodiment of the invention.
  • FIGs 1-5, 7 and 9 parts of paper machines for manufacturing a structured fibrous web 1 of soft paper, such as tissue and other paper products with low density, are shown schematically.
  • Each of the paper machines comprises a wet section 2, a press section 3 and a drying section 4.
  • the wet section 2 comprises a headbox 7, a forming roll 8, an endless carrying inner clothing 9 and an endless covering outer clothing 10 consisting of a forming wire.
  • the inner and outer clothings 9 and 10 run i separate loops around several guide rolls 11 and 12 respectively.
  • the drying section 4 comprises a drying cylinder 5, which is covered by a hood 30.
  • the drying cylinder is suitably a Yankee cylinder.
  • the press section 3 comprises a press, which has two cooperating first and second press members 14 and 19, which press members 14 and 19 together define a press nip. Further, the press section comprises an endless press felt 15, which runs in a loop around the first press member 14 and guide rolls 6, and an endless impermeable belt 16, which has a smooth surface facing the fibrous web. The smooth impermeable belt 16 runs in a loop around the second press member 19 and a plurality of guide rolls 18.
  • the press is a shoe press, the first and second press members of which consist of a shoe press roll 14 and a counter roll 19.
  • the shoe press roll 14 and the counter roll 19 define between them an extended press nip.
  • the press is a roll press, the first and second press members of which consist of a suction roll 14 and a smooth roll 19.
  • the press section has two presses, namely the aforementioned roll press, followed by a shoe press, comprising a shoe press roll 32 and a counter roll 33, which together define an extended press nip.
  • the clothings of the shoe press may preferably be the same as the clothings 15 and 16 of the roll press, that is to say that the press felt 15 and the impermeable belt 16 run through the extended press nip in the shoe press.
  • the shoe press roll 32 is arranged in the loop of the press felt 15, which loop comprises a side loop part 34, which runs to an extended suction zone around the suction roll 14 and around guide rolls 37 and then to the extended press nip. Thus rewetting of the fibrous web is prevented and water is removed from the press felt 15.
  • the counter roll 33 is arranged in the loop of the impermeable belt 16. In the embodiment shown in Figure 9 the same counter roll is used for the two press nips.
  • the inner clothing 9 of the wet section 2 is a felt, which is conveyed to the press section 3 to be utilized as a press felt 15 as well and which thus runs in a loop back to the forming roll 8.
  • the inner clothing 9 of the wet section 2 is a smooth impermeable belt, which is conveyed to the press section 3 to be utilized as its belt 16 as well and which thus runs in a loop back to the forming roll 8.
  • the inner clothing 9 of the wet section 2 is a wire, the press felt 15 running around a pick-up roll 20 arranged close to the loop of the wire 9 so that the press felt 15 and the wire 9 run in contact with each other for transfer of the fibrous web from the wire 9 to the press felt 15.
  • the pick-up roll 20 may be provided with a suction shoe (not shown) . Alternatively, the pick-up roll and suction shoe may be replaced by a pick-up suction box.
  • the embodiment shown in Figure 9 may have a wet section similar to the one shown in Figure 7.
  • An endless clothing 22 is arranged to run in a loop around a suction device 23, located adjacent to the smooth belt 16 to define a transfer point 40 for transfer of the fibrous web from the smooth belt 16 to the clothing 22.
  • the suction device 23 forms a suction zone 41, designed to enable the suction attachment of the fibrous web and its continued adherence to the clothing 22 as desired.
  • the clothing 22 runs around a transfer roll 24, which defines a non-compressing nip with the drying cylinder 5 for transfer of the paper web from the clothing 22 to the drying cylinder 5.
  • said suction device 23 is a suction roll, with which the smooth belt 16 defines a non-compressing nip, wherein the suction zone 41 encompasses a sector angle sufficient to secure the transfer of the fibrous web from the smooth belt 16 to the clothing 22.
  • the suction device is a suction shoe.
  • the suction shoe 23 and the smooth belt 16 are arranged so close to each other that a non-compressing nip is defined between the clothing 22 and the belt 16.
  • the suction shoe 23 and the smooth belt 16 are arranged at a distance from each other so that during operation a gap 42 exists between the clothing 22 and the belt 16, which is greater than the thickness of the web.
  • the suction zone 41 of the suction shoe 23 is located downstream of said non-compressing nip or, as the case may be, gap 42.
  • the shown paper machines also comprise special structuring means for structuring the paper web, before it reaches the drying roll 6, in order to achieve increased bulk.
  • said structuring means comprise said clothing 22, that is in the shape of a wire, and a powerful suction device 25.
  • Figure 6 shows an enlargement of a cut-out surface section of the wire 22, where the machine direction is indicated by an arrow.
  • the wire 22 has a web-contacting side with a structure that is made up of depressions 35 and arched or convex surface parts 36 situated therebetween. The depressions 35 are through-going such that air can be sucked through the wire 22 to the desired extent.
  • the depressions 35 and the arched surface parts 36 are in turn made up of the strands of the wire 22 running longitudinally and transversely as seen in the machine direction, the longitudinal strands exhibiting oblong arc-shaped ridges 36a and the transverse strands exhibiting knuckles 36b, which knuckles produce bowl -shaped pits in the fibrous web during the structuring process.
  • the wire has 100 knuckles 36b per cm 2 . Generally, it may exhibit 25-150 knuckles per cm 2 , preferably 50-100 knuckles per cm 2 .
  • the powerful suction device mentioned is placed in the loop of the wire 22 upstream of the transfer roll 24 in sliding contact with the wire.
  • the powerful suction device which may consist of one or several suction boxes, operates at a high vacuum, which acts on the inside of the permeable wire.
  • a suitable vacuum is within the range 40-80 kPa.
  • the fibrous web passes the powerful suction device together with the wire, the fibrous web is deflecting into the depressions of the wire 22, whereby the fibrous web will assume the structure of the wire as an impression.
  • the structure of the fibrous web will remain after the suction device.
  • the speed of the wire 22 is equal to and preferably less than the speed of the smooth impermeable belt 16. Most preferred, this difference in speed is 10-25 per cent.
  • said structuring means comprise a creping doctor 26, the doctor blade 43 of which is aimed against the movement direction of the smooth impermeable belt 16 and forms an acute angle ⁇ with the belt 16.
  • This angle ⁇ can be in the range 5°-25°, preferably 10°-15°.
  • the creping doctor 26 operates continuously with its doctor blade 43 against the smooth surface of the belt 16 so that the fibrous web is loosed from the belt 16 through scraping and crinkled in the same way as during creping of the fibrous web from the drying cylinder 5.
  • the fibrous web, crinkled through scraping, is conveyed away from the belt up towards a downstream section of the suction shoe 23 having a suction slit 27, which the fibrous web passes during suction attachment to the clothing 22, which may be a wire or a felt.
  • the creping doctor 26 is arranged at a short distance from and downstream of the non-compressing nip ( Figures 7, 8) or, as the case may be, gap 42 ( Figure 9) that is defined by the suction shoe 23 and the smooth belt, so that a small space is created between the suction shoe 23 and the creping doctor 26, as measured at the edge of the doctor blade 43.
  • the speed of the wire or felt 22 is less than the speed of the smooth impermeable belt 16. Most preferred, the difference in speed is 10-25 per cent.
  • the transfer point at the suction device 23 as shown in Figures 1-8 has a non-compressing nip between the clothing 22 and the smooth belt 16.
  • a non-compressing nip is desired particularly for bulk-sensitive grades, for instance tissue.
  • the expression "non-compressing nip" means that the nip should compress the web to such a small extent that after the nip the web substantially regains the bulk it had before the nip.
  • the distance between the suction device 23 and the belt 16 may be pre-set, while the paper machine is not running, so that a small gap is created between the clothing 22 and the belt 16.
  • the web will be subjected to a micro-creping when it passes the non-compressing nip at the transfer point as shown in Figures 1-5 even if said pre-setting is not carried out, provided that the wire runs at a lower speed than the belt 16. It will be apparent that a greater difference in speed between the wire and the belt will result in augmented fine crinkling. Micro-creping is also obtained in the embodiment shown in Figures 7 and 8 when the web passes the non-compressing nip, which lacks a suction zone, since the clothing 22 operates at a lower speed than the belt 16 to achieve creping when the web is loosed from the belt by the creping doctor.
  • the counter roll 19 is a smooth roll and is arranged in the loop of the smooth impermeable belt 16.
  • the positions of the rolls 14, 19 are reversed, that is to say that the shoe press roll 14 is arranged in the loop of the smooth impermeable belt 16 and the counter roll 19 in the loop of the press felt 15.
  • the counter roll 19 may be a suction roll, a grooved roll or a blind-drilled roll .
  • the paper web is carried to the single-felted press section either by the press felt 15 (Figures 1, 2, 4, 5, 7, 9) directly form the forming roll ( Figures 2 and 4) or from the inner forming wire 9 ( Figures 1, 5, 7 and 9) or by the smooth belt 16 ( Figure 3) to be conveyed through the press nip whilst enclosed between the press felt 15 and the smooth belt 16.
  • the paper web obtains a dry solids content of at least 35 per cent and preferably in the range 38-45 per cent.
  • the press felt 15 is conveyed away from the smooth belt 16, which in all the embodiments carries the paper web up to the clothing 22.

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Abstract

A paper machine and a method for manufacturing a structured soft paper web are described, which machine has a wet section (2), a press section (3), a drying section (4) and a web-carrying clothing (22) running around a suction device (23) close to a smooth impermeable belt (16) in the press section for the creation of a transfer point (40). In accordance with the invention, structuring means (A; B) for structuring the web are arranged between the press section and the drying section. The structuring means comprise either (A) said clothing in the shape of a permeable wire, the structure of which is made up of depressions (35) and arched surface parts (36), including knuckles in a quantity of 25-150 knuckles per cm2, and a suction device (25) that, at a vacuum of 40-80 kPa, draws the web to the structured side of the wire so that the web acquires the structure of the wire, wherein the wire operates at a speed ≤ the speed of the belt, or (B) a creping doctor (26) that is located in a space between the belt and the clothing and in scraping contact with the belt so as to loose the web during simultaneous crinkling, the suction device having a suction gap (27) for initial suction of the web firmly to the clothing for transfer to a drying cylinder. The web-carrying clothing operates then at a speed that is < the speed of the belt.

Description

Paper machine for and method of manufacturing structured soft paper
The present invention relates to a paper machine for manufacturing a structured fibrous web of soft paper, comprising:
- a wet section, including a headbox, a forming roll, and inner and outer clothings, which run around the forming roll and between which the fibrous web is formed; - a press section, including at least one press, having two cooperating press members, one of which being a counter roll, defining a press nip between them, a smooth impermeable belt, and a press felt, wherein the smooth impermeable belt and the press felt run through the press nip with the fibrous web enclosed therebetween;
- a drying section, including a drying cylinder and a transfer roll which, together with the drying cylinder, defines a transfer nip for transfer of the fibrous web to the drying cylinder; and - an endless clothing running in a loop around a suction device, located close to the smooth belt for the creation of a transfer point, and around the transfer roll that defines a nip together with the drying cylinder, which clothing carries the fibrous web from the smooth belt to the drying cylinder.
Paper machines for manufacturing soft paper with high bulk are known through a number of patent specifications. Usually a texturing wire or a texturing felt is used, which, together with the formed paper web runs through a press nip, in which the paper web is pressed into the texturing wire and thus acquires a textured pattern on one of its sides. Paper machines with such texturing wires and press nips are described in US-3 , 301, 746, US-3, 537, 954, US-4 , 309 , 246 , US-4 , 533 , 37 , US-5 , 569 , 358 , US-5,591,305 and WO 91/16493 (corresponding to SE-466 063) . The disadvantage with paper machines in accordance with these specifications is that the dewatering in the press nip is relatively low, so that the dry solids content of the paper web is low when the paper web is transferred to the drying cylinder, which results in the output of the paper machine being relatively low.
US-4, 849, 054 describes a machine for manufacturing a textured fibrous web with high bulk, where the fibrous web is pressed in a single-clothed roller press having a transfer roll, which, together with a texturing wire, defines a nip at a transfer point for the web. At the transfer point, the texturing wire runs around a stationary suction pipe, which has a slot opening facing the nip, which is so wide that the fibrous web is not compressed when it runs through it . By means of the suction from the suction pipe via the narrow slot opening, the fibrous web is transferred to the texturing wire and formed in accordance with the surface of the texturing wire facing the fibrous web, which surface has a three-dimensional pattern. Before the transfer point, the fibrous web has a speed which is greater than the speed of the texturing wire. The roller that carries the fibrous web up to the non-compressing nip has a smooth surface and it is well known that, in practice, there are problems associated with transferring a fibrous web that has been pre-pressed to a dry solids content of 30-50 per cent from a smooth surface to a wire and retaining it on the wire. If the suction, for any reason, were to stop or be reduced, the fibrous web would continue with the smooth roller, which might result in shut-down and damage to the machine. The paper machine in accordance with this patent specification, US-4 , 849, 054 , cannot be operated at the high speeds that are demanded today, because of the configuration of the press and the transfer point with a stationary suction pipe, around which the texturing wire runs with high friction between them.
A similar arrangement is shown in US-4 , 834 , 838 , particularly Figure 9, where the fibrous web passes a suction opening so that it is drawn to the wire, whereby the surface facing the wire should acquire a wave-shaped pattern corresponding to the wire, while the other surface of the fibrous web should be smooth. Differences in speed between the wire and the opposite web-carrying element should result in the fibrous web becoming stretchable. The fibrous web has been dewatered before it reaches said suction opening, but no description is given of how this dewatering is effected in this specific embodiment. In any event, it is not apparent from this patent specification that a bulk should be recreated after pressing in a roller nip. The wave shape, limited to one surface, will completely or mainly be destroyed during the subsequent contacts with different elements, such as drying cylinders and felts, although the stretchability achieved in the fibrous web is retained. In this case also, there are problems associated with transferring the fibrous web to and retaining it on the wire .
US-5,411,636 describes the manufacture of soft paper, where the paper web is formed on a forming wire, pre-pressed in a double-felted press nip and transferred to a coarse-meshed wire. The paper web, while being carried by the coarse-meshed wire, is subjected to a vacuum in a suction zone so that the paper web is drawn into the openings and depressions of the wire so that the paper web acquires an increased thickness and, thus, increased bulk. The coarse-meshed wire then carries the paper web to the drying cylinder. The double-felted press nip results in the dry solids content of the paper web after the press nip being relatively low, namely 25-30 per cent. As no dewatering can be carried out in the nip at the drying cylinder, the dry solids content of the paper web when it is transferred to the drying cylinder is correspondingly low. Furthermore, it is extremely doubtful that the paper web really is transferred from the felt to the coarse-meshed wire.
To increase the dry solids content of the paper web up to the drying cylinder without subjecting the paper web to compressing forces in one or several press nips the technique of through-blow drying is used, see for instance US-3 , 301, 746, US-5,411,636, US-5,667,636 (corresponding to WO 95/00706), US-4 , 440 , 597, US-5,364,504, US-5 , 529 , 664 , US-3, 994, 771 (corresponding to SE-7605986-4), US-4 , 529 , 480. This technique produces a paper web with high bulk. A paper machine with through-blow drying does, however, entail high investment costs as well as high running costs, mainly with respect to energy consumption. Several of these patent specifications describe perforated belts that have openings into which the fibrous web is deflecting at a point before a drying cylinder, and the belt and the drying cylinder define a nip in which the fibrous web is then textured.
The purpose of the present invention is to provide an improved paper machine, with which it is possible, without through-blow drying, to re-create at least an essential part of the bulk reduction, which the paper web is subjected to by compression in a roll-press or shoe-press nip, and to manufacture a fibrous web with high bulk and a high dry solids content before the drying cylinder so as to achieve high production at a reasonable cost .
It is also a purpose of the invention to provide an improved paper machine that produces a paper web that qualitatively equals the results achieved by through-blow drying, but at a lower cost in respect of installation as well as operation and without hot air being supplied.
It is also a purpose of the invention to provide a paper machine that has a press section in which a high-level of dewatering of the paper web is carried out and which has means arranged before the drying cylinder that re-create an essential part of the bulk lost during pressing.
The paper machine in accordance with the invention is characterized in that structuring means for structuring the fibrous web are arranged at at least one point downstream of the press section and upstream of the drying section, which structuring means comprise either (A) said clothing, which runs around the transfer roll, in the shape of a permeable wire with a web-contacting structured side, the structure of which is made up of depressions and arched surface parts situated therebetween, said arched surface parts including knuckles in a quantity of 25-150 knuckles per cm2, and a suction device that is designed to operate at a vacuum of 40-80 kPa and that is arranged in the loop of the wire and with which the wire is in slidable contact with its side facing away from the web-contacting structured side, the suction device being designed to draw the fibrous web into intimate contact with the structured side of the wire so that the fibrous web is deflecting into said depressions and assumes the structure of the wire, wherein the clothing which carries the structured fibrous web to the drying cylinder, is arranged to be operated at a speed equal to or less than the speed of the smooth impermeable belt, or (B) a creping doctor that is arranged in a wedge-shaped space between the smooth impermeable belt and said clothing running around the transfer roll, which creping doctor is aimed towards and in scraping contact with the smooth impermeable belt so as to loose the fibrous web from the smooth impermeable belt during simultaneous crinkling, said suction device around which the clothing runs, having a suction gap arranged downstream of and close to the point where the fibrous web is loosed from the smooth impermeable belt for initial suction of the crinkled fibrous web firmly to the clothing for transfer to the drying cylinder, wherein the clothing carrying the structured fibrous web to the drying cylinder is arranged to be operated at a speed that is less than the speed of the smooth impermeable belt .
The invention is described further in the following with reference to the drawings.
Figure 1 shows a paper machine in accordance with a first embodiment of the invention.
Figure 2 shows a paper machine in accordance with a second embodiment of the invention.
Figure 3 shows a paper machine in accordance with a third embodiment of the invention.
Figure 4 shows a paper machine in accordance with a fourth embodiment of the invention.
Figure 5 shows a paper machine in accordance with a fifth embodiment of the invention.
Figure 6 shows, in perspective, a surface part of a wire included in the paper machines in accordance with Figures 1-5.
Figure 7 shows a paper machine in accordance with a sixth embodiment of the invention. Figure 8 shows an enlarged view of a creping doctor and a suction shoe, which are included in the paper machine in accordance with Figure 7.
Figure 9 shows a paper machine in accordance with a seventh embodiment of the invention.
In Figures 1-5, 7 and 9, parts of paper machines for manufacturing a structured fibrous web 1 of soft paper, such as tissue and other paper products with low density, are shown schematically. Each of the paper machines comprises a wet section 2, a press section 3 and a drying section 4. The wet section 2 comprises a headbox 7, a forming roll 8, an endless carrying inner clothing 9 and an endless covering outer clothing 10 consisting of a forming wire. The inner and outer clothings 9 and 10 run i separate loops around several guide rolls 11 and 12 respectively. The drying section 4 comprises a drying cylinder 5, which is covered by a hood 30. The drying cylinder is suitably a Yankee cylinder. At the outlet side of the drying section a creping doctor 21 is arranged to crepe the fibrous web 1 off the Yankee cylinder 5. An application device 31 is provided for applying a suitable glue on the envelope surface of the Yankee cylinder 5 just before a transfer nip. The press section 3 comprises a press, which has two cooperating first and second press members 14 and 19, which press members 14 and 19 together define a press nip. Further, the press section comprises an endless press felt 15, which runs in a loop around the first press member 14 and guide rolls 6, and an endless impermeable belt 16, which has a smooth surface facing the fibrous web. The smooth impermeable belt 16 runs in a loop around the second press member 19 and a plurality of guide rolls 18.
In the embodiments shown in Figures 1-3, the press is a shoe press, the first and second press members of which consist of a shoe press roll 14 and a counter roll 19. The shoe press roll 14 and the counter roll 19 define between them an extended press nip.
In the embodiments shown in Figures 4, 5, 7 and 9, the press is a roll press, the first and second press members of which consist of a suction roll 14 and a smooth roll 19. In the embodiment shown in Figure 9, the press section has two presses, namely the aforementioned roll press, followed by a shoe press, comprising a shoe press roll 32 and a counter roll 33, which together define an extended press nip. The clothings of the shoe press may preferably be the same as the clothings 15 and 16 of the roll press, that is to say that the press felt 15 and the impermeable belt 16 run through the extended press nip in the shoe press. The shoe press roll 32 is arranged in the loop of the press felt 15, which loop comprises a side loop part 34, which runs to an extended suction zone around the suction roll 14 and around guide rolls 37 and then to the extended press nip. Thus rewetting of the fibrous web is prevented and water is removed from the press felt 15. The counter roll 33 is arranged in the loop of the impermeable belt 16. In the embodiment shown in Figure 9 the same counter roll is used for the two press nips.
In the embodiments shown in Figures 2 and 4, the inner clothing 9 of the wet section 2 is a felt, which is conveyed to the press section 3 to be utilized as a press felt 15 as well and which thus runs in a loop back to the forming roll 8.
In the embodiment shown in Figure 3, the inner clothing 9 of the wet section 2 is a smooth impermeable belt, which is conveyed to the press section 3 to be utilized as its belt 16 as well and which thus runs in a loop back to the forming roll 8. In the embodiments shown in Figures 1, 5, and 7, the inner clothing 9 of the wet section 2 is a wire, the press felt 15 running around a pick-up roll 20 arranged close to the loop of the wire 9 so that the press felt 15 and the wire 9 run in contact with each other for transfer of the fibrous web from the wire 9 to the press felt 15. The pick-up roll 20 may be provided with a suction shoe (not shown) . Alternatively, the pick-up roll and suction shoe may be replaced by a pick-up suction box. The embodiment shown in Figure 9 may have a wet section similar to the one shown in Figure 7.
An endless clothing 22 is arranged to run in a loop around a suction device 23, located adjacent to the smooth belt 16 to define a transfer point 40 for transfer of the fibrous web from the smooth belt 16 to the clothing 22. The suction device 23 forms a suction zone 41, designed to enable the suction attachment of the fibrous web and its continued adherence to the clothing 22 as desired. Further, the clothing 22 runs around a transfer roll 24, which defines a non-compressing nip with the drying cylinder 5 for transfer of the paper web from the clothing 22 to the drying cylinder 5. In the embodiments shown in Figures 1-5, said suction device 23 is a suction roll, with which the smooth belt 16 defines a non-compressing nip, wherein the suction zone 41 encompasses a sector angle sufficient to secure the transfer of the fibrous web from the smooth belt 16 to the clothing 22. In the embodiment shown in Figures 7-9, the suction device is a suction shoe. In Figures 7 and 8, the suction shoe 23 and the smooth belt 16 are arranged so close to each other that a non-compressing nip is defined between the clothing 22 and the belt 16. In Figure 9, the suction shoe 23 and the smooth belt 16 are arranged at a distance from each other so that during operation a gap 42 exists between the clothing 22 and the belt 16, which is greater than the thickness of the web. In the embodiments shown in Figures 7-9, the suction zone 41 of the suction shoe 23 is located downstream of said non-compressing nip or, as the case may be, gap 42.
The shown paper machines also comprise special structuring means for structuring the paper web, before it reaches the drying roll 6, in order to achieve increased bulk.
In the embodiments shown in Figures 1-5, said structuring means comprise said clothing 22, that is in the shape of a wire, and a powerful suction device 25. Figure 6 shows an enlargement of a cut-out surface section of the wire 22, where the machine direction is indicated by an arrow. The wire 22 has a web-contacting side with a structure that is made up of depressions 35 and arched or convex surface parts 36 situated therebetween. The depressions 35 are through-going such that air can be sucked through the wire 22 to the desired extent. The depressions 35 and the arched surface parts 36 are in turn made up of the strands of the wire 22 running longitudinally and transversely as seen in the machine direction, the longitudinal strands exhibiting oblong arc-shaped ridges 36a and the transverse strands exhibiting knuckles 36b, which knuckles produce bowl -shaped pits in the fibrous web during the structuring process. In the embodiment shown in Figure 6, the wire has 100 knuckles 36b per cm2. Generally, it may exhibit 25-150 knuckles per cm2, preferably 50-100 knuckles per cm2. The powerful suction device mentioned is placed in the loop of the wire 22 upstream of the transfer roll 24 in sliding contact with the wire. The powerful suction device, which may consist of one or several suction boxes, operates at a high vacuum, which acts on the inside of the permeable wire. A suitable vacuum is within the range 40-80 kPa. When the fibrous web passes the powerful suction device together with the wire, the fibrous web is deflecting into the depressions of the wire 22, whereby the fibrous web will assume the structure of the wire as an impression. As the fibrous web is subjected to a high vacuum and the fibrous web is still damp during this suction phase, the structure of the fibrous web will remain after the suction device. To achieve the desired structuring it is also important that the speed of the wire 22 is equal to and preferably less than the speed of the smooth impermeable belt 16. Most preferred, this difference in speed is 10-25 per cent.
In the embodiments shown in Figures 7-9, said structuring means comprise a creping doctor 26, the doctor blade 43 of which is aimed against the movement direction of the smooth impermeable belt 16 and forms an acute angle α with the belt 16. This angle α can be in the range 5°-25°, preferably 10°-15°. The creping doctor 26 operates continuously with its doctor blade 43 against the smooth surface of the belt 16 so that the fibrous web is loosed from the belt 16 through scraping and crinkled in the same way as during creping of the fibrous web from the drying cylinder 5. The fibrous web, crinkled through scraping, is conveyed away from the belt up towards a downstream section of the suction shoe 23 having a suction slit 27, which the fibrous web passes during suction attachment to the clothing 22, which may be a wire or a felt. The creping doctor 26 is arranged at a short distance from and downstream of the non-compressing nip (Figures 7, 8) or, as the case may be, gap 42 (Figure 9) that is defined by the suction shoe 23 and the smooth belt, so that a small space is created between the suction shoe 23 and the creping doctor 26, as measured at the edge of the doctor blade 43. To achieve the desired structuring, that is creping, the speed of the wire or felt 22 is less than the speed of the smooth impermeable belt 16. Most preferred, the difference in speed is 10-25 per cent. By the use of the creping doctor 26, the fibrous web obtains a crinkled structure that results in increased stretchability and bulk. The nip between the transfer roll 24 and the drying cylinder 5 is non-compressing and the improved properties are not negatively affected by the transfer of the fibrous web to the drying cylinder 5.
As mentioned above, the transfer point at the suction device 23 as shown in Figures 1-8 has a non-compressing nip between the clothing 22 and the smooth belt 16. A non-compressing nip is desired particularly for bulk-sensitive grades, for instance tissue. The expression "non-compressing nip" means that the nip should compress the web to such a small extent that after the nip the web substantially regains the bulk it had before the nip. To ensure that as high bulk as possible is maintained, the distance between the suction device 23 and the belt 16 may be pre-set, while the paper machine is not running, so that a small gap is created between the clothing 22 and the belt 16. When a suction roll 23 as shown in Figures 1-5 is used, or a suction shoe with a suction zone in the same position, the suction from the suction roll 23 or, alternatively, the suction shoe will during operation lift the belt 16 with the web lying thereon into contact with the wire to define said non-compressing nip. This facilitates a so-called "rush transfer" or "microcontraction" , that is to say that the wire 22 runs at a lower speed than the belt 16 so that the web is contracted lengthways causing fine crinkling, so-called micro-creping, as the web runs through the non-compressing nip. The contraction results in increased web thickness. The web will be subjected to a micro-creping when it passes the non-compressing nip at the transfer point as shown in Figures 1-5 even if said pre-setting is not carried out, provided that the wire runs at a lower speed than the belt 16. It will be apparent that a greater difference in speed between the wire and the belt will result in augmented fine crinkling. Micro-creping is also obtained in the embodiment shown in Figures 7 and 8 when the web passes the non-compressing nip, which lacks a suction zone, since the clothing 22 operates at a lower speed than the belt 16 to achieve creping when the web is loosed from the belt by the creping doctor.
In the embodiments shown in Figures 1-3, the counter roll 19 is a smooth roll and is arranged in the loop of the smooth impermeable belt 16. In alternative embodiments (not shown) of the press section shown in Figures 1-3, the positions of the rolls 14, 19 are reversed, that is to say that the shoe press roll 14 is arranged in the loop of the smooth impermeable belt 16 and the counter roll 19 in the loop of the press felt 15. In such a configuration, the counter roll 19 may be a suction roll, a grooved roll or a blind-drilled roll .
The paper web is carried to the single-felted press section either by the press felt 15 (Figures 1, 2, 4, 5, 7, 9) directly form the forming roll (Figures 2 and 4) or from the inner forming wire 9 (Figures 1, 5, 7 and 9) or by the smooth belt 16 (Figure 3) to be conveyed through the press nip whilst enclosed between the press felt 15 and the smooth belt 16. By use of the shown presses, the paper web obtains a dry solids content of at least 35 per cent and preferably in the range 38-45 per cent. After the single press nip or the second press nip (Figure 9) , the press felt 15 is conveyed away from the smooth belt 16, which in all the embodiments carries the paper web up to the clothing 22.

Claims

C L A I M S
1. A paper machine for manufacturing a structured fibrous web (1) of soft paper, comprising: - a wet section (2) , including a headbox (7) , a forming roll (8) , and inner and outer clothings (9, 10) , which run around the forming roll (8) and between which the fibrous web (1) is formed;
- a press section (3) , including at least one press, having two cooperating press members (14, 19), one of which is a counter roll, defining a press nip between them, a smooth impermeable belt (16) , and a press felt (15) , wherein the smooth impermeable belt (16) and the press felt (15) run through the press nip with the fibrous web enclosed therebetween;
- a drying section (4) , including a drying cylinder (5) and a transfer roll (24) which, together with the drying cylinder (5) , defines a transfer nip for transfer of the fibrous web to the drying cylinder (5) ; and - an endless clothing (22) running in a loop around a suction device (23) , located close to the smooth belt (16) for the creation of a transfer point (40) , and around the transfer roll (24) that defines a nip together with the drying cylinder (5) , which clothing (22) carries the fibrous web from the smooth belt (16) to the drying cylinder (5) ; characterized in that structuring means (A; B) for structuring the fibrous web are arranged at at least one point downstream of the press section and upstream of the drying section, which structuring means comprise either
(A) said clothing (22) , which runs around the transfer roll (24) , in the shape of a permeable wire with a web-contacting structured side, the structure of which is made up of depressions (35) and arched surface parts (36) situated therebetween, said arched surface parts (36) including knuckles in a quantity of 25-150 knuckles per cm2, and a suction device (25) that is designed to operate at a vacuum of 40-80 kPa and that is arranged in the loop of the wire (22) and with which the wire is in slidable contact with its side facing away from the web-contacting structured side, the suction device being designed to draw the fibrous web into intimate contact with the structured side of the wire so that the fibrous web is deflected into said depressions and assumes the structure of the wire, wherein the clothing (22) which carries the structured fibrous web to the drying cylinder (5) , is arranged to be operated at a speed equal to or less than the speed of the smooth impermeable belt, or (B) a creping doctor (26) that is arranged in a wedge-shaped space between the smooth impermeable belt (16) and said clothing (22) running around the transfer roll (24) , which creping doctor (26) is aimed towards and in scraping contact with the smooth impermeable belt (16) so as to loose the fibrous web from the smooth impermeable belt (16) during simultaneous crinkling, said suction device (23) around which the clothing (22) runs, having a suction gap (27) arranged downstream of and close to the point where the fibrous web is loosed from the smooth impermeable belt (16) for initial suction of the crinkled fibrous web firmly to the clothing (22) for transfer to the drying cylinder, wherein the clothing (22) carrying the structured fibrous web to the drying cylinder is arranged to be operated at a speed that is less than the speed of the smooth impermeable belt (16) .
2. A paper machine as claimed in claim 1, characterized in that said surface parts (36) include 50-100 knuckles per cm2.
3. A paper machine as claimed in claim 1, characterized in that said creping doctor (26) has a doctor blade (43) that forms an acute angle ╬▒ with the smooth impermeable belt (16) of 5┬░-25┬░, preferably 10┬░-15┬░.
4. A paper machine as claimed in any one of claims 1-3, characterized in that said transfer point (40) comprises a non-compressing nip.
5. A paper machine as claimed in any one of claims 1 and 3, characterized in that said transfer point comprises a gap (42) between the clothing (22) and the smooth belt (16) that is located upstream of the creping doctor and has a width greater than the thickness of the web .
6. A paper machine as claimed in any one of claims 1-5, characterized in that the press section is designed so as to give the fibrous web a dry solids content of 35-48 per cent, preferably 38-45 per cent.
7. A paper machine as claimed in any one of claims 1-6, characterized in that the press section comprises two presses, at least one of which is a shoe press.
8. A method for manufacturing a structured fibrous web (1) of soft paper in a paper machine, comprising:
- a wet section (2) , including a headbox (7) , a forming roll (8) , and inner and outer clothings (9, 10) , which run around the forming roll (8) and between which the fibrous web (1) is formed;
- a press section (3), including at least one press, having two cooperating press members (14, 19), one of which is a counter roll, defining a press nip between them, a smooth impermeable belt (16) , and a press felt (15) , wherein the smooth impermeable belt (16) and the press felt (15) run through the press nip with the fibrous web enclosed therebetween;
- a drying section (4) , including a drying cylinder (5) and a transfer roll (24) which, together with the drying cylinder (5) , defines a transfer nip for transfer of the fibrous web to the drying cylinder (5) ; and - an endless clothing (22) running in a loop around a suction device (23) , located close to the smooth belt (16) for the creation of a transfer point (40) , and around the transfer roll (24) that defines a nip together with the drying cylinder (5) , which clothing (22) carries the fibrous web from the smooth belt (16) to the drying cylinder (5) ; characterized in that the fibrous web is structured by structuring means (A; B) arranged at at least one point downstream of the press section (3) and upstream of the drying section (4) , which structuring means comprise either
(A) said clothing (22) , which runs around the transfer roll (24) , in the shape of a permeable wire with a web-contacting structured side, the structure of which is made up of depressions (35) and arched surface parts (36) situated therebetween, said arched surface parts (36) including knuckles in a quantity of 25-150 knuckles per cm2, and a suction device (25) that operates at a vacuum of 40-80 kPa and that is arranged in the loop of the wire (22) and with which the wire is in slidable contact with its side facing away from the web-contacting structured side, the suction device being designed to draw the fibrous web into intimate contact with the structured side of the wire so that the fibrous web is deflected into said depressions and assumes the structure of the wire, wherein the clothing (22) which carries the structured fibrous web to the drying cylinder (5) , operates at a speed equal to or less than the speed of the smooth impermeable belt (16) , or (B) a creping doctor (26) that is arranged in a wedge-shaped space between the smooth impermeable belt (16) and said clothing (22) running around the transfer roll (24), which creping doctor (26) is aimed towards and in scraping contact with the smooth impermeable belt (16) so as to loose the fibrous web from the smooth impermeable belt (16) during simultaneous crinkling, said suction device (23) around which the clothing (22) runs, having a suction gap (27) arranged downstream of and close to the point where the fibrous web is loosed from the smooth impermeable belt (16) for initial suction of the crinkled fibrous web firmly to the clothing (22) for transfer to the drying cylinder, wherein the clothing (22) carrying the structured fibrous web to the drying cylinder (5) operates at a speed that is less than the speed of the smooth impermeable belt (16) .
9. A method as claimed in claim 8, characterized in that said surface parts (36) include 50-100 knuckles per
10. A method as claimed in claim 8, characterized in that said creping doctor (26) has a doctor blade (43) that forms an acute angle ╬▒ with the smooth impermeable belt (16) of 5┬░-25┬░, preferably 10┬░-15┬░.
11. A method as claimed in any one of claims 8-10, characterized in that the press section gives the fibrous web a dry solids content of 35-48 per cent, preferably 38-45 per cent.
PCT/SE1999/001360 1998-09-09 1999-08-11 Paper machine for and method of manufacturing structured soft paper WO2000014330A1 (en)

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EP99968692A EP1112408A1 (en) 1998-09-09 1999-08-11 Paper machine for and method of manufacturing structured soft paper
JP2000569061A JP2002524669A (en) 1998-09-09 1999-08-11 Paper machine and method for producing structured soft paper

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SE9803041-4 1998-09-09
SE9803041A SE512808C2 (en) 1998-09-09 1998-09-09 Paper machine and method for making textured tissue

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SE9803041L (en) 2000-03-10
SE9803041D0 (en) 1998-09-09
JP2002524669A (en) 2002-08-06
EP1112408A1 (en) 2001-07-04
SE512808C2 (en) 2000-05-15

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