EP1304413A2 - Section de séchage et un appareil de lissage pour la section de séchage - Google Patents

Section de séchage et un appareil de lissage pour la section de séchage Download PDF

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Publication number
EP1304413A2
EP1304413A2 EP20020020540 EP02020540A EP1304413A2 EP 1304413 A2 EP1304413 A2 EP 1304413A2 EP 20020020540 EP20020020540 EP 20020020540 EP 02020540 A EP02020540 A EP 02020540A EP 1304413 A2 EP1304413 A2 EP 1304413A2
Authority
EP
European Patent Office
Prior art keywords
shoe
smoothing
web
roller
drying cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20020020540
Other languages
German (de)
English (en)
Other versions
EP1304413A3 (fr
Inventor
Jens Dr. Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE2001151456 external-priority patent/DE10151456A1/de
Priority claimed from DE2001151457 external-priority patent/DE10151457A1/de
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1304413A2 publication Critical patent/EP1304413A2/fr
Publication of EP1304413A3 publication Critical patent/EP1304413A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices

Definitions

  • the invention relates to a drying section of a Machine for the production of a material web, in particular paper or Cardboard web, and a smoothing device in particular for use in such a dryer section.
  • Dryer sections with an integrated smoothing device are, for example, out the publications DE 196 02 697 A1, DE 195 48 307 A1, DE 196 04 675 C2, DE 44 07 405 C2 and F. Müller: "Paper manufacturing and its Maschinen II ", German press, 1928, known.
  • An object of the invention according to the first aspect is to improve To create dryer section as well as an improved smoothing device which the aforementioned disadvantages are eliminated.
  • it should also ensure that maintenance and service work on the Smoothing device within the dryer section as efficiently as possible and without disrupt the operation of the manufacturing machine concerned can be.
  • the smoothing device strives to ensure that this is optimal in a drying party can be used.
  • this object is achieved through a dryer section of a machine for producing a material web, in particular paper or cardboard web, with one in the web running direction elongated smoothing nip, between two opposite one another Press surfaces is formed, of which at least one by one Shoe roll is formed, at least 70% and preferably at least 90% of the outside diameter of the shoe roller above the machine base lie.
  • Spacers can advantageously be used between the shoe roller bearing and a respective one Bearing block and / or cantilever elements are used.
  • the stake of spacers and / or cantilever elements is related with the present invention of particular advantage.
  • the coat can be assembled and / or disassembled with the help of an entry device. This device can also be used as a lever for one-sided lifting the shoe roller, e.g. B. by the indoor crane. This enables that Removal of a spacer between the bearing and the bearing block and thus is threading and putting the coat over the shoe Shoe roll. In the cantilevering process, the shoe roller is introduced a bending moment raised on the opposite side, see above that the spacers are removed without lifting on the operating side can.
  • both press surfaces are each formed by a shoe unit or shoe roller.
  • At least one of the two press surfaces is advantageously heated. At least one of the two press surfaces is preferably heated Smoothing surface provided.
  • the dryer section according to the invention is the shoe roller with simultaneous internal cooling, e.g. B. by means of the lubricating oil, isolated from the environment by a hood. It is, for example, an insulation of the entire shoe roller with a Hood against the hot, humid environment with simultaneous internal Cooling z. B. possible by means of the lubricating oil.
  • the elements in question are designed in such a way that their function due to the high temperature in a respective drying hood due to the large temperature differences between standstill and operation is not impaired.
  • hooded shoe roller from the inside and / or to be cooled from the outside with cooling air.
  • the extended smoothing nip can be in a single row or in a double row Drying group can be arranged.
  • the smoothing device comprises an elongated smoothing nip in the direction of web travel, between two each other opposing pressing surfaces is formed, at least of which one formed by a shoe roller and at least one of which is heated is, preferably one of the two pressing surfaces by a Shoe roller and the other is formed by a drying cylinder. At least one of the two press surfaces is preferably heated Smoothing surface provided.
  • a smoothing device is thus proposed, which in is particularly suitable for use in a dryer section.
  • the drying cylinder preferably has a compared to a conventional drying cylinder increased bending moment.
  • the drying cylinder can, for example, increase the bending moment an outside diameter> 1.5 m, in particular> 1.8 m, in particular 2 m and preferably> 2.4 m and / or a ribbed inner peripheral surface have.
  • drying cylinder is controlled by deflection is.
  • deflection control can therefore be used in particular be provided, as is the case with shoe presses.
  • At least one of the two press surfaces is advantageously heated, with a surface temperature> 40 ° C, preferably> 60 ° C has.
  • the smoothing gap or the respective smoothing mechanism can, for example, within a sieve loop can be arranged. Basically, however, is also an arrangement outside such a sieve loop is conceivable.
  • the flexible jacket of the shoe roller is advantageously up to approximately 120 ° C. temperature resistant, this jacket preferably made of a corresponding thermally resilient plastic.
  • the flexible jacket of the shoe roller can in particular be made of elastomer Polymer-based material, e.g. B. made of polyurethane.
  • the respective Sheath reinforcement is preferably made of elastomeric material, whose modulus of elasticity is greater than the modulus of elasticity of the elastomer Jacket material.
  • the oil used in the shoe roller for lubrication is preferably up to about 120 ° C temperature resistant.
  • the quality of the oil used can So in particular be chosen so that temperatures up to 120 ° C no change in quality such as viscosity.
  • the oil and the elastomeric jacket material are advantageously on top of one another Voted.
  • the outer diameter of the jacket of the shoe roller is preferably ⁇ 1.8 m. This optimally suits the space available Accounted for, whereby respective air flows are not obstructed and accordingly the climate is not adversely affected.
  • the shoe roller comprises a shoe fixed in the middle, so that thermal expansion is possible on both sides.
  • the shoe of the shoe roller can in particular by the one in question Lubricating oil are cooled, causing thermal expansion of the Shoe is reduced or prevented. Basically, there is also a Cooling from the inside possible with cooling air, cooling with lubricating oil is usually safer, simpler and more effective.
  • shoe roller has means for eliminating it the friction occurring between due to thermal expansion Shoe and associated pressure unit is provided.
  • Shoe and associated pressure unit is provided.
  • hydrostatic pressure pistons, sliding elements or a pressing unit as in the case of those available on the market "FlexoNip" possible.
  • the shoe of the shoe roll is advantageously in the transverse direction and / or web running direction, can be applied sectionally or pressed. This enables smoothness profiling in the transverse direction, for example.
  • the shoe roller is advantageously z. B. isolated from the environment by a hood using the lubricating oil. It is, for example, an insulation of the entire shoe roller with a Hood against the hot, humid environment with simultaneous internal Cooling z. B. possible by means of the lubricating oil. Alternatively or additionally however, there is also the possibility of a respective with a hood provided shoe unit from the inside and / or outside with cooling air cool.
  • the shoe roller is assigned a hood that can be opened upwards and to the sides at least as far as that the opening created is at least as large as the outside diameter the shoe roller dimensioned and preferably by 1.5 times to Is dimensioned twice as large as the outside diameter of the shoe roller.
  • Another important aspect of the invention relates to design the shoe roller and / or the drying cylinder at the respective edges. So occurs when operating a shoe roller within a dryer section the problem on that the hot surface of the drying cylinder especially at the edges not covered with paper due to radiation the preferably made of plastic jacket of the shoe roller heats up to an unacceptable extent, reducing its service life becomes. This can be remedied by the fact that the jacket material is made from a thermally resilient plastic.
  • the device according to the invention not from the material web covered edge areas of the two press surfaces, in particular in the Smoothing plane a distance from each other.
  • drying cylinder is attached to the Edges are conical in shape and / or the stroke of the shoe roller assigned shoe is dimensioned so that the outer Edges of the circulating belt a distance from the opposite Press area results in> 5 mm, in particular> 8 mm and preferably > 12 mm.
  • the invention relates to a method for combined drying and smoothing of a material web, in particular Paper or cardboard web, in a dryer section and also a corresponding one Smoothing device and a dryer section with such a smoothing device.
  • the smoothing nips formed by pairs of rollers In high-speed paper machines this is the case with smoothing units the dwell time of the material web in the smoothing nip is too short, so that it is not sufficient Smoothness can be generated.
  • Another disadvantage is in that the pressure increase or - occurring in the nip gradient is too large, which can damage the paper web can.
  • the shape of the smoothing pressure curve in machines or Web direction can not be chosen arbitrarily, but from is dependent on the roller diameters. However, it is often necessary the course of pressure in the machine direction of different types of paper to change. Without such an adjustment of the pressure curve is no optimal smoothing result without negatively influencing the rest Paper quality parameters possible. With these conventional methods and devices is also no influence on the smooth cross-section possible. In addition, the smoothness that can be achieved is particularly fast Paper machines inadequate.
  • An object of the invention according to the second aspect is an improved one Process, an improved smoothing device and an improved dryer section of the aforementioned type, in which the previously mentioned disadvantages are eliminated.
  • the smoothing nip is therefore provided at such a position in the dryer section, has already started at the main shrinking process, so that the smoothness is retained and not again due to shrinking processes is deteriorating.
  • Shrinking the surface of the The material web is getting rougher again.
  • At least one of the two pressing surfaces is preferably separated by one Shoe unit is formed, which is in particular a shoe roller can act.
  • a shoe roller In the case of a shoe roller, its flexible jacket forms the belt in question.
  • the value R a (mean roughness value) is advantageously ⁇ 4 ⁇ m and preferably ⁇ 3 ⁇ m for at least one of the two press surfaces.
  • the two press surfaces can be different or one have the same smoothness.
  • a moistening device can be installed in front of the extended press nip in the direction of web travel for the sectional influencing of the web moisture across Web running direction are used.
  • the extended smoothing nip can be in a single-tier dryer section or Dryer group or also in a two-tier dryer section or dryer group be provided.
  • the smoothing device comprises an elongated smoothing nip in the direction of web travel, between two each other opposing pressing surfaces is formed, at least of which one formed by a circumferential band and at least one of which is heated.
  • the smoothing device is special suitable for use in the dryer section.
  • Smoothing device is at least one of the two pressing surfaces by one Shoe unit formed, which is again a particular Shoe roller can act through the flexible jacket of the relevant revolving band is formed.
  • the two press surfaces can again be different or different have the same smoothness.
  • At least one of the two press surfaces is advantageously heated Smoothing surface provided.
  • the invention Device is one of the two pressing surfaces by a rotating one Belt or one shoe unit and the other through a drying cylinder educated.
  • the drying cylinder preferably has a compared to a conventional drying cylinder increased bending moment.
  • the drying cylinder can, for example, be one Outside diameter> 1.5 m, in particular> 1.8 m and preferably > 2 m and / or have a ribbed inner circumferential surface.
  • the drying cylinder is preferably controlled by deflection. It can in particular, such a deflection control can be provided, as is the case with shoe presses.
  • At least one of the two press surfaces is advantageously heated, wherein it has a surface temperature> 40 ° C, preferably> 60 ° C.
  • the machine or web running speed can in particular > 450 m / min and preferably> 1200 m / min.
  • the web dwell time in the smoothing gap > 0.8 msec, in particular> 2 msec and preferably> 4 msec and / or in the direction of web travel measured shoe length> 30 mm and preferably> 60 mm.
  • the smoothing gap or the respective smoothing mechanism can, for example, within a sieve loop is arranged. Basically, however, is also one Arrangement outside sieve loops is conceivable.
  • At least one of the two press surfaces is marked by a up to about 120 ° C temperature-resistant circumferential band formed, wherein this band preferably from a correspondingly thermally resilient Plastic is made.
  • the circulating belt can be, for example around the flexible band of a shoe unit, e.g. B. the flexible jacket act on a shoe roller.
  • the circulating belt can be made in particular of elastomeric material polymeric base, e.g. B. made of polyurethane.
  • the band reinforcement is preferably made of elastomeric material, whose modulus of elasticity is greater than the modulus of elasticity of the elastomer Strip material.
  • the oil used for lubrication in the respective shoe unit is expediently temperature-resistant up to 120 ° C.
  • the quality of the Oil used can be chosen so that temperatures up to 120 ° C for no change in quality such as of viscosity.
  • the oil and the elastomeric tape material are expediently coordinated.
  • the outer diameter is preferably ⁇ 1.8 m.
  • the outer diameter is Shoe roller preferably less than or equal to the outside diameter of the Drying cylinder.
  • a central fixation of the respective shoe is also advantageous, whereby thermal expansion on both sides is possible.
  • the shoe of a respective shoe unit can in particular by Lubricating oil in question are cooled, with a thermal expansion of the shoe is reduced or prevented. Basically, though cooling from the inside with cooling air is also possible, cooling by means of However, lubricating oil is usually safer, easier and more effective.
  • the shoe unit is expediently provided with means for eliminating the due to thermal expansion friction between Provide shoe and assigned pressure unit.
  • means for eliminating the due to thermal expansion friction between Provide shoe and assigned pressure unit is for example the use of hydrostatic pressure pistons, sliding elements or one Pressing unit as in the case of the "FlexoNip" available on the market conceivable.
  • the shoe unit comprises a sectioned section in the transverse direction Shoe over which the smoothness in the transverse direction, d. H. across the machine or section direction can be influenced.
  • the smoothness is thus profilable in the transverse direction.
  • the shoe unit is advantageous with simultaneous internal cooling z. B. isolated from the environment by means of the lubricating oil through a hood. For example, it is an insulation of the entire shoe roller with a hood against the hot, humid environment at the same time internal cooling z. B. possible by means of the lubricating oil.
  • a respective a shoe unit provided with a hood from the inside and / or from the outside To cool cooling air.
  • Another important aspect of the invention relates again to Design of the shoe unit or shoe roller and / or the drying cylinder on the respective edges. So occurs during operation, for example a shoe roller within a dryer section the problem that the hot surface of the drying cylinder especially on the not Paper covered edges preferably by radiation Plastic existing jacket of the shoe roller to an inadmissible extent heats up, reducing its lifespan.
  • the remedy is on the one hand possible that the jacket material made of thermally resilient Plastic is made.
  • the edge areas of the two press surfaces not covered by the material web a distance from one another in particular in the plane of the smoothing nip on.
  • drying cylinder is attached to the Edges are tapered and / or the stroke of the shoe unit assigned shoe is dimensioned so that the outer Edges of the circulating belt a distance from the opposite Press area results in> 5 mm, in particular> 8 mm and preferably> Is 12 mm. It is also possible, for example, to have the drying cylinder stepped perform.
  • drying or smoothing cylinder is heated from the outside, e.g. B. electrically, by steam and / or like.
  • the device is the drying or smoothing cylinder in the transverse direction considered sectionally heatable, which increases the sectional moisture of the material web can be influenced accordingly, so that the smooth cross profile can be controlled and / or regulated accordingly. This is particularly effective with a dry content> 60%.
  • the hood assigned to the shoe roller follows above and to the sides can be opened at least to the extent that the resulting opening at least as large as the outside diameter of the Shoe roller dimensioned and preferably 1.5 times to 2 times is dimensioned larger than the outside diameter of the shoe roller.
  • a dryer section of a machine is also used Production of a material web, in particular paper or cardboard web, with a smoothing device according to the second aspect of the invention proposed.
  • Another important aspect of the invention relates to the arrangement the shoe roller in the drying party.
  • the dry party according to the invention provided that at least 70% and preferably at least 90% of the The outer diameter of the shoe roller lies above the machine base.
  • the shoe roller can in particular also completely over the Machine floor.
  • This has the advantage of being a respective one Assembly or disassembly of the jacket of the shoe roller quickly and with little device effort can be performed.
  • Who are for economic operation of the paper machine concerned Advantages are significant. This initially results in shorter downtimes.
  • spacers between the bearing Shoe unit and a respective bearing block and / or cantilever elements be used. The use of spacers and / or cantilever elements is in connection with the present invention of special advantage.
  • the jacket can be used with an entry device assembled and / or disassembled.
  • This facility can be used at the same time as a lever for lifting the shoe roller on one side, e.g. B. by the Indoor crane, serve. This enables the removal of a spacer between the bearing and the bearing block and thus threading and putting on of the coat over the shoe of the shoe roller.
  • cantilevering the shoe roller by introducing a bending element on the opposite Side raised so that the spacers without lifting can be removed on the operating side.
  • an economical and technologically improved Solution for smoothing a material web such as in particular a paper or cardboard web specified, in particular for higher machine speeds is suitable.
  • Figures 1 and 2 each show a purely schematic partial representation a dryer section 10, each with an extension in the web running direction L.
  • Smoothing nip 12 two possible arrangements purely by way of example the formation of such an extended smoothing nip 12 serving shoe roller 14 are shown.
  • the respective dryer section 10 can in particular be used for a machine Production of a material web, in particular paper and / or cardboard web, be assigned.
  • the respective dryer section 10 can therefore in particular Be part of a paper machine.
  • Figures 1 and 2 each show a section of a single row Dryer section 10 or single-tier dryer group with above the base of the paper machine 16 arranged drying cylinders 18. Below the drying cylinder 18 web guide rollers 20 are provided, which in the present embodiment at least partially below the Paper machine floor 16 can be arranged.
  • the material web 22 is together with a respective conveyor belt, here drying wire 24 or 26, at least in sections meandering guided around the drying cylinders 18 and the web guide rollers 20.
  • a respective conveyor belt here drying wire 24 or 26
  • drying wire 24 or 26 at least in sections meandering guided around the drying cylinders 18 and the web guide rollers 20.
  • the respective smoothing nip 12 elongated in the web running direction L is in each case formed between a shoe roll 14 and a drying cylinder 18.
  • the shoe roller 14 is in one case directly below the relevant one Drying cylinder 18 arranged (see. Fig. 1), while in the other Case is arranged directly above the drying cylinder (see. Fig. 2).
  • shoe roller 14 in the exemplary embodiment according to FIG. 1 is provided outside the sieve loops, it is in the in Fig. 2nd illustrated embodiment within the loop of the dryer fabric 24 arranged.
  • the loop in question is here, for example formed that the drying wire 24 in the area in question over at least an additional web guide roller 28, 30 is guided.
  • FIGS. 1 and 2 The two embodiments shown in FIGS. 1 and 2 is thus common that within the dry party 10 at least one in Web running direction L extended smoothing nip 12 is provided, which between two opposing pressing surfaces is formed, one of which at least one is formed by a shoe roller 14. Thereby lie at least 70% and preferably at least 90% of the shoe roll outer diameter above the machine floor 16. In the two shown Embodiments, the shoe roller 14 is completely complete above the machine floor 16.
  • the respective shoe roller 14 comprises at least one shoe 38, over which the flexible roll shell 44 to form the relevant extended press nips or nip 12 against the opposite Drying cylinder 18 can be pressed.
  • FIG. 1 shows a schematic partial representation of a single-tier dryer section 10 with a shoe roll 14 which has a flexible jacket 44 and which, with a drying cylinder 18 arranged above it, forms a smoothing nip 12 extended in the web running direction L.
  • the drying cylinder 18 opposite the shoe roller 14 is set higher than the remaining drying cylinders 18.
  • the axis of the drying cylinder 18 opposite the shoe roller 14 lies at a height h 2 above the machine base 16, which is larger than that Height h 1 , in which the remaining drying cylinders 18 are arranged.
  • a suction box 32 is provided.
  • Conveyor belt 56 e.g. B. a dryer fabric or a smoothing belt, of which Dryer screen 24 taken over and together with the conveyor belt 26 through the elongated smoothing nip 12 in the web running direction L.
  • the material web 22 is in the area a deflection roller 28 through a drying wire 26 from the conveyor belt 26 taken over and together with this dryer 26 the following Drying cylinder 18 supplied.
  • a suction box 60 is provided.
  • shoe roller 14 To the below the concerned drying cylinder 18 and within the loop of the conveyor belt 56 provided shoe roller 14 is an air-cooled, for example Hood 62 provided.
  • the cylinder 18 arranged above the shoe roller 14 is heated and serves as a smoothing cylinder.
  • the suctioned web guide or deflection rollers 20 have a smaller one Diameter than the drying cylinders 18.
  • FIG. 2 shows a schematic partial illustration Embodiment of a single-tier dryer section, in which the shoe roller 14 with a drying cylinder 18 arranged below it in Web running direction L forms an elongated smoothing nip 12.
  • the cylinder forming the elongated smoothing nip 12 with the shoe roller 14 18 is heated again here and provided as a smoothing cylinder.
  • the shoe roller 14 is in the present case within the loop of the Dryer screen 24 arranged.
  • a high vacuum zone 66 is provided for the smoothing cylinder 18.
  • Fig. 3 shows a schematic longitudinal sectional partial representation of an example Embodiment of a shoe roll 14 and a drying cylinder 18 comprehensive smoothing unit to form a in the web running direction extended smoothing nips 12.
  • the shoe roller 14 in question is particular can be used in a dryer section.
  • the coat of Shoe roller 14 which is preferably made of plastic, inadmissible Heats up mass, the arrangement is made so that the not of the Material web 22 covered edge areas of the two press surfaces in particular have a distance from each other in the smoothing plane.
  • the drying cylinder 18 is at the edges 40 conically shaped that on the outer edges 42 of the circumferential flexible tape, d. H. here is the jacket 44 of the shoe roller 14 Distance d to the opposite smoothing surface, d. H. to the surface of the Drying cylinder 18, which expediently> 5 mm, in particular > 8 mm and preferably> 12 mm.
  • this shoe roller includes 14 a flexible jacket running around a non-rotatable yoke 46 44, the at least one shoe 38 against the drying cylinder in question 18 can be pressed.
  • the shoe 38 is by a variety of am Yoke 46 supported, e.g. B. hydraulic support elements 48. These support elements 48 can be, for example act hydraulic cylinder / piston assemblies.
  • the flexible coat 44 is by means of a respective jacket attachment 50 on end plates 52 attached.
  • Fig. 4 shows another in a schematic longitudinal section exemplary embodiment of a shoe roller 14 and one Drying cylinder 18 smoothing unit to form a web running direction extended smoothing nips 12.
  • the stroke h of the shoe 38 is dimensioned such that the desired on the outer edges 42 of the shoe roll shell 44 Distance d results.
  • Fig. 5 shows again in a schematic partial longitudinal section another exemplary embodiment of a shoe roller 14 and a drying cylinder 18 smoothing unit to form a in Web running direction extended smoothing nips 12.
  • drying cylinder 18 is designed stepped to the outer edges 42 of the shoe roll shell 44 the desired Obtain distance d to the opposite drying cylinder 18.
  • FIG. 6 shows a purely schematic partial representation of a dryer section 110, in the purely exemplary two possible arrangements of one of the education an elongated smoothing nip 112 or 112 'serving shoe roller 114 and 114 'are shown.
  • the dryer section 110 can in particular be a machine for manufacturing assigned to a material web, in particular paper or cardboard web his.
  • the dryer section 110 can therefore in particular be part of a paper machine his.
  • FIG. 6 shows a section of the dryer section 110 with a row from drying cylinders arranged above the paper machine base 116 118, whose axes lie in one plane, for example. Below the drying cylinder 118 web guide rollers 120 are provided, which at present exemplary embodiment at least for the most part below the Paper machine base 116 are arranged.
  • the material web 122 is together with a respective conveyor belt, here dryer wire 124 or 126, at least in sections meandering guided around the drying cylinders 118 and the web guide rollers 120.
  • the web guide rollers 120 are at such a distance of the drying cylinders 118 arranged between the drying cylinders 118 and the web guide rollers 120 free running paths for the material web and the respective dryer fabric 124 or 126 result.
  • the smoothing nip 112 which is elongated in the web running direction L, is between one shoe roller 114 on top and a drying cylinder on the bottom 118 formed.
  • the shoe roller 114 is z. B. directly above the relevant drying cylinder 118 arranged (see the left part of the Fig. 6).
  • this shoe roller 114 is within a loop of the Dryer screen 124 provided.
  • the loop in question is, for example formed in that the drying wire 124 in the area of a web guide roller 128 from the drying cylinder 118 and the one continued thereon Material web 122 separated and then via, for example, a Web guide roller 130 is guided before being in the area of another web guide roller 132 runs up again on the drying cylinder 118, whereby the Material web 122 through drying wire 124 back to the drying cylinder 118 is pressed.
  • the dryer wire 124 can also be spaced two provided web guide rollers 134, 136 are guided, whereby the loop is enlarged accordingly.
  • Extended shoe roll 114 'forming smoothing nip 112' is in one area diagonally above the relevant drying cylinder 118 and outside the loops of the two dryer fabrics 124, 126 arranged (see right part of Fig. 6).
  • the material web 122 is initially up to a predefinable one Dry content> 60%, in particular> 65% and preferably> 70% dried.
  • the material web having this predeterminable dry content 122 is then extended by the respective web running direction L.
  • Smoothing nip 112 and 112 'performed between two opposite one another Press surfaces is formed, one of which is formed by a all-round flexible band, here the flexible jacket of the concerned Shoe roll 114 or 114 ', and the other heated by the relevant one Drying cylinder is formed.
  • The will be extended Smoothing nip 112 or 112 'resulting press time preferably selected> 0.8 ms.
  • the material web follows the smoothing nip 112 or 112 ' 122 further dried.
  • the shoe roller 114 or 114 ' comprises at least one shoe 138, over the flexible roll shell with the formation of an extended press nip or gap can be pressed against the drying cylinder 118 in question is.
  • Fig. 7 shows a schematic longitudinal sectional partial representation of an example Embodiment of a shoe roll 114 and a drying cylinder 118 comprehensive smoothing unit to form one in the direction of web travel extended smoothing nips 112.
  • the arrangement is such that the edge regions of the two press surfaces not covered by the material web 122 a distance from one another in particular in the plane of the smoothing nip exhibit.
  • the drying cylinder 118 is at the edges 140 shaped conically in such a way that the outer edges 142 of the rotating flexible belt, d. H. here is the jacket 144 of the Shoe roll 114, a distance d to the opposite smoothing surface, d. H. here to the surface of the drying cylinder 118, which expediently > 5 mm, in particular> 8 mm and preferably> 12 mm.
  • this shoe roller includes 114 a flexible jacket running around a non-rotatable yoke 146 144, which has at least one shoe 138 against the drying cylinder 118 can be pressed.
  • the shoe 138 is supported by a variety of yokes 146 supported, e.g. B. hydraulic support elements 148. These support elements 148 can be hydraulic, for example Act cylinder / piston assemblies.
  • the flexible jacket 144 is by means of a respective jacket fastening 150 on end disks 152 attached.
  • Fig. 8 shows another in a schematic longitudinal section exemplary embodiment of a shoe roll 114 and one Drying cylinder 118 comprising smoothing unit to form a web running direction extended smoothing nips 112.
  • the stroke h of the shoe 138 is dimensioned such that at the outer edges 142 of the shoe roll jacket 144 the desired one Distance d results.
  • FIG. 9 again shows a partial schematic longitudinal section Another exemplary embodiment of a shoe roller 114 and a drying cylinder 118 comprising smoothing unit to form an in Web running direction extended smoothing nips 112.
  • drying cylinder 118 is designed stepped to the outer edges 142 of the shoe roll jacket 144 the desired To obtain distance d from the opposite drying cylinder 118.
  • Fig. 10 shows a schematic partial representation of a single-tier dryer section 110 with a shoe roll having a flexible jacket 144 114, the one with a drying cylinder 118 arranged above Web running direction forms elongated smoothing nip 112.
  • the drying cylinder 118 opposite the shoe roller 114 must be set higher than the remaining drying cylinders.
  • the axis of the drying cylinder opposite the shoe roller 114 lies at a height H 2 above the machine base 116, which is greater than the height H 1 at which the remaining drying cylinders 118 are arranged.
  • a suction box 154 is provided.
  • a conveyor belt 156 e.g. B. a dryer fabric or a smoothing belt, taken from the dryer wire 124 and together with the Conveyor belt 156 through the smoothing nip extended in the direction of web travel L. 112 led.
  • the material web 122 is in the area behind the elongated smoothing nip 112 a deflection roller 158 through a dryer fabric 126 from the conveyor belt 156 taken over and together with this dryer 126 to the subsequent drying cylinder 118.
  • a suction box 160 is provided.
  • shoe roll 114 an air-cooled hood 162, for example, is provided.
  • the cylinder 118 arranged above the shoe roller 114 is heated and serves as a smoothing cylinder.
  • the suctioned web guide or deflection rollers 120 have a smaller one Diameter than the cylinders 118.
  • FIG. 11 shows a further exemplary embodiment in a schematic partial illustration a single-tier dryer section 110 with a shoe roller 114, the with a drying cylinder 118 arranged underneath one in the direction of web travel L forms an elongated smoothing nip 112.
  • drying cylinders 118 slightly lower than the neighboring ones Drying cylinder 118.
  • web stabilizers 164 are provided in the area of the web guide rolls lying lower than the cylinders 118 here.
  • the shoe roller 114 is the same as that shown in the left part of FIG. 6 Embodiment again within the loop of a dryer fabric 124 arranged.
  • a high vacuum zone 166 is provided for the smoothing cylinder 118.
  • Fig. 12 shows in a sectional partial representation one with a ribbed Drying cylinder 118 provided on the inner peripheral surface for use in a corresponding smoothing unit having a shoe roller.
  • Ribs 170 provided on the inside of the jacket 168 of the drying cylinder 118 there is an increased bending moment with the shoe roller 114 extended drying or smoothing cylinder 118 forming the smoothing nip (cf. 6 to 11). This can, for example, in the circumferential direction extending ribs may be provided.
  • FIGS. 1 to 5 relate primarily the first aspect of the invention, while the embodiments of the Figures 6 to 12 relate primarily to the second aspect of the invention.
  • any combinations of these are also according to the invention two aspects of the invention and thus also the different exemplary embodiments possible.

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EP02020540A 2001-10-18 2002-09-16 Section de séchage et un appareil de lissage pour la section de séchage Withdrawn EP1304413A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10151457 2001-10-18
DE2001151456 DE10151456A1 (de) 2001-10-18 2001-10-18 Trockenpartie sowie Glättvorrichtung für eine solche Trockenpartie
DE2001151457 DE10151457A1 (de) 2001-10-18 2001-10-18 Verfahren zum kombinierten Trocknen und Glätten einer Materialbahn und Glättvorrichtung
DE10151456 2001-10-18

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EP1304413A2 true EP1304413A2 (fr) 2003-04-23
EP1304413A3 EP1304413A3 (fr) 2004-05-12

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US (1) US7114268B2 (fr)
EP (1) EP1304413A3 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP1698727A1 (fr) * 2005-03-04 2006-09-06 Voith Paper Patent GmbH Machine à papier

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EP0451449A1 (fr) * 1990-04-09 1991-10-16 Sulzer-Escher Wyss Gmbh Procédé de lissage d'une bande de papier ou carton enduite des deux côtés
DE4328505A1 (de) * 1993-08-25 1995-03-16 Voith Gmbh J M Cantileverbare Walze
DE19540898A1 (de) * 1995-11-02 1997-05-07 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Behandlung einer Faserstoff- oder Papierbahn in einer Preßvorrichtung
DE19602697A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19604675A1 (de) * 1996-02-09 1997-08-14 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Faserstoffbahn
EP0851059A1 (fr) * 1996-12-24 1998-07-01 Voith Sulzer Papiermaschinen GmbH Machine pour la fabrication d'un materiau en bande continue
US6065222A (en) * 1996-02-28 2000-05-23 Valmet Corporation Dryer sections with intermediate calendering in a paper machine
US6189442B1 (en) * 1998-12-16 2001-02-20 Valmet Corporation Apparatus for calendering paper
DE19941336A1 (de) * 1999-08-31 2001-03-01 Voith Paper Patent Gmbh Trocknungsvorrichtung
US6203307B1 (en) * 1997-08-28 2001-03-20 Champion International Corporation System for finishing surface of a web of paper having an improved continuous finishing belt

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DE3311998A1 (de) * 1983-04-02 1984-10-04 J.M. Voith Gmbh, 7920 Heidenheim Bandpresseinheit, vorzugsweise als nasspresse einer papiermaschine
US5127168A (en) * 1989-07-20 1992-07-07 Pulp And Paper Research Institute Of Canada Method for manufacture of smooth and glossy papers and apparatus
DE4216264C2 (de) 1992-05-16 2000-05-25 Voith Sulzer Papiermasch Gmbh Verfahren zum Trocknen und Auflockern einer Papierbahn
DE4407405C2 (de) 1994-03-05 2000-03-16 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19507374C2 (de) * 1995-03-03 1997-01-09 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19548307A1 (de) 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19654200A1 (de) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Naßpresse
SE511703C2 (sv) * 1998-03-20 1999-11-08 Nordiskafilt Ab Albany Användning av ett överföringsband för en mjukpappersmaskin
FI104100B (fi) 1998-06-10 1999-11-15 Valmet Corp Integroitu paperikone

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Publication number Priority date Publication date Assignee Title
EP0451449A1 (fr) * 1990-04-09 1991-10-16 Sulzer-Escher Wyss Gmbh Procédé de lissage d'une bande de papier ou carton enduite des deux côtés
DE4328505A1 (de) * 1993-08-25 1995-03-16 Voith Gmbh J M Cantileverbare Walze
DE19540898A1 (de) * 1995-11-02 1997-05-07 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Behandlung einer Faserstoff- oder Papierbahn in einer Preßvorrichtung
DE19602697A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19604675A1 (de) * 1996-02-09 1997-08-14 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Faserstoffbahn
US6065222A (en) * 1996-02-28 2000-05-23 Valmet Corporation Dryer sections with intermediate calendering in a paper machine
EP0851059A1 (fr) * 1996-12-24 1998-07-01 Voith Sulzer Papiermaschinen GmbH Machine pour la fabrication d'un materiau en bande continue
US6203307B1 (en) * 1997-08-28 2001-03-20 Champion International Corporation System for finishing surface of a web of paper having an improved continuous finishing belt
US6189442B1 (en) * 1998-12-16 2001-02-20 Valmet Corporation Apparatus for calendering paper
DE19941336A1 (de) * 1999-08-31 2001-03-01 Voith Paper Patent Gmbh Trocknungsvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1698727A1 (fr) * 2005-03-04 2006-09-06 Voith Paper Patent GmbH Machine à papier

Also Published As

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EP1304413A3 (fr) 2004-05-12
US20030110660A1 (en) 2003-06-19
US7114268B2 (en) 2006-10-03

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