WO2023222430A1 - Procédé et machine permettant d'augmenter l'allongement transversal d'une bande de papier formant couverture spéciale dans des machines à papier à grande vitesse - Google Patents

Procédé et machine permettant d'augmenter l'allongement transversal d'une bande de papier formant couverture spéciale dans des machines à papier à grande vitesse Download PDF

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Publication number
WO2023222430A1
WO2023222430A1 PCT/EP2023/062134 EP2023062134W WO2023222430A1 WO 2023222430 A1 WO2023222430 A1 WO 2023222430A1 EP 2023062134 W EP2023062134 W EP 2023062134W WO 2023222430 A1 WO2023222430 A1 WO 2023222430A1
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WIPO (PCT)
Prior art keywords
paper web
section
drying
testliner
drying section
Prior art date
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PCT/EP2023/062134
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German (de)
English (en)
Inventor
Linus FRIEDRICH
Marc HARMS
Vera Loher
Georg SCHOLL
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2023222430A1 publication Critical patent/WO2023222430A1/fr

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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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/008—Steam showers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper

Definitions

  • the invention relates to a method and a machine for drying a testliner paper web to promote shrinkage in high-speed paper machines for producing packaging papers, comprising a forming section for forming and dewatering the testliner paper web, a press section and at least two drying sections with a first drying section and a second drying section , for further dewatering of the testliner paper web, with a coating section being arranged after the first drying section and before the second drying section, for applying an application medium to the testliner paper web, further comprising, preferably after the second drying section, a smoothing section, for smoothing the testliner Paper web and, a winding section, for rolling up the testliner paper web.
  • Testliner paper webs are preferably used as a top layer in corrugated cardboard.
  • the testliner paper web itself can be produced in one layer or in multiple layers; the testliner paper web is preferably produced as two-layer or three-layer paper webs in order to have a good external appearance and to cover the lower quality fiber content usually used in the middle.
  • different forming sections adapted to the layer structure are used.
  • conventional coating devices or application units are used in a coating section in the production of testliner papers. These are used for applying glue or coating and, depending on the application medium, increase the finishing properties or increase the surface properties and thus ensure, for example, better printability of the testliner papers.
  • the first drying section before the coating section is also called the pre-drying section and the second drying section after the coating section is also called the post-drying section.
  • testliner paper web receives intermediate storage before coating, in particular with a winding section or similar.
  • All available known drying types can be used to dry the testliner paper web, with a single-row drying cylinder configuration preferably being used as the pre-drying section and, for example, a combined form of contactless dryers and a two-row drying cylinder configuration being used as the post-drying section.
  • a single-row drying cylinder configuration preferably being used as the pre-drying section and, for example, a combined form of contactless dryers and a two-row drying cylinder configuration being used as the post-drying section.
  • it is also conceivable to use a differently combined configuration in particular a configuration which, for example, only uses single-row drying cylinder configurations in a pre-drying and post-drying section, or a pure two-row drying cylinder configuration is also conceivable as a post-drying section.
  • the document DE4428745 A1 JM Voith GmbH, February 15, 1996, discloses a solution which eliminates the difficulties in transferring or threading the paper web from a previous production section to a subsequent machine section of the paper machine. The focus is on safe and reliable transfer for high-speed paper machines within the dryer sections.
  • the document DE4428745 A1 further discloses various, some already known, possible embodiments of one- and/or two-row drying cylinder configurations and possible combinations of these different drying section configurations with the underlying one Type of transfer Reference is also made to the use of the embodiments after a coating section for further paper finishing.
  • the document DE4110875 A1 (J.M. Voith GmbH), October 8, 1992, discloses the execution of a web guide of a coating device and a subsequent after-drying section or also called the after-drying group in the document DE4110875 A1.
  • the object of the invention is to reduce web waviness in the transverse direction. It discloses the post-drying section after a coating device on which the current application is based and preferably the contactless drying section in the post-drying section for paper webs.
  • the document EP3224409 A1 (Voith Patent GmbH), October 4, 2017, discloses a method and a device for producing packaging paper, in particular sack kraft paper. This type of paper has special properties and therefore places special demands on the strength and stretchability of the paper. The document reveals how investment and operating costs can be minimized while maintaining high quality packaging paper.
  • the document EP3224409 A1 discloses the various aspects for influencing the preferred properties such as strength and extensibility (elasticity) in the overall process, which are also used as a basis in particular for the production of the testliner paper webs.
  • the object of the invention is to increase the mechanical properties of a testliner paper web, in particular the elasticity in the transverse direction to the machine direction, using a new combined drying and moistening process.
  • the object is achieved according to the invention by a method and a device according to the independent claims. Further advantageous embodiments of the present invention can be found in the subclaims
  • the disadvantage of the task in the prior art is that the shrinkage or expansion of the testliner paper web in the transverse direction is limited or even almost completely prevented.
  • the use of a single-row drying cylinder configuration reduces the stretch properties in the transverse direction the most, with a reduction in the stretch properties in the transverse direction being smaller with a double-row drying cylinder configuration and lowest with a non-contact drying type. This is due to the fact that web stabilization or support of the testliner paper web decreases.
  • the constantly deteriorating average quality of the fiber materials has a further disadvantageous effect on the elongation properties, particularly characterized by an increasing ash content. Furthermore, an increased use of surface thicknesses leads to the finished testliner paper web being more brittle.
  • test liner strongly influence the properties of the subsequent products manufactured, especially corrugated cardboard.
  • An important property of the testliner is increased stretch or elasticity. If this is not achieved on the test liner, this will result in reduced strength values and lower impact resistance in the subsequent product, which are not acceptable for the above-mentioned applications.
  • a reduced stretch property of the test liner can also have a negative effect in the manufacturing process of the packaging material when producing specified bending points in the packaging material, the so-called creasing process, in that the test liner paper web tears and a so-called score cracking occurs. This means that towards the end of the whole thing During the manufacturing process, the almost finished packaging material becomes scrap, which means very high costs for the paper manufacturer.
  • Elongation is understood to mean the elongation at break of the testliner paper web, which can usually be determined by a tensile strength test according to DIN EN ISO 1924-2, status: 2021 -08, and from the resulting force-strain diagram from a testliner paper web.
  • shrinkage is understood to mean the change in the width, i.e. transverse to the running direction, of the Testliner paper web in relation to a width of the Testliner paper web in a machine section preceding the running direction.
  • the shrinkage can mainly occur when a paper web is still wet when drying and is influenced by the arrangement of the components in the corresponding machine section.
  • the elongation and shrinkage are directly linked to one another, for example an increased shrinkage in the running direction of the testliner paper web directly means an increased elongation of the testliner paper web and at the same time also an increased workload.
  • increased shrinkage transversely to the running direction has a positive effect on the stretching in the transverse direction.
  • a total expansion potential of a testliner paper web is determined by an expansion potential in the running direction and an expansion potential transverse to the running direction or in the transverse direction.
  • the method according to the invention for shrinkage-promoting drying in the transverse direction of a testliner paper web in a paper machine for the production and/or processing of packaging papers in at least two drying sections is characterized in that the testliner paper web is dried to a first dry content A after the second drying section and in an immediately following humidification unit, preferably one on both sides Nozzle humidifier, is re-humidified to a second dry content B, which is below the first dry content A.
  • On both sides is understood to mean that at least one moistening unit, preferably a nozzle moistener, is arranged on an upper side of the testliner paper web and at least one moistening unit is arranged on an underside opposite the upper side of the testliner paper web and the testliner paper web is arranged on both sides, preferably evenly , is moistened.
  • at least one moistening unit preferably a nozzle moistener
  • the second drying section can be carried out without structural changes and, by expanding it with a moistening unit, enables re-moistening and, by means of a further third drying section, preferably a contactless drying section, immediately after the moistening unit, free shrinkage of the testliner paper web in the optimal dry content range of the testliner paper web for drying that promotes shrinkage, so that an increased shrinkage value of the testliner paper web can arise.
  • a further third drying section preferably a contactless drying section
  • the second drying section is designed as an extended second drying section and the testliner paper web is “overdried” and shrunk more. Overdried means drying above the usual dry content of around 90%.
  • the re-moistening to an optimal dry content value in the optimal dry content range for shrinkage-promoting shrinkage, by the immediately following moistening unit and the renewed drying by the further third, contactless drying section with further free shrinkage, to a dry content C enables the highest possible, increased shrinkage values.
  • the shrinkage of the testliner paper web can be advantageously influenced once the testliner paper web has a dry content of 55% to 80% dry content. This optimal influence range can be set with the humidification unit immediately following the second or second, extended drying section.
  • testliner paper web By using the same paper machine configuration for economic reasons for different requirements for the testliner paper web, different parameters of the testliner paper web result over the length of the paper machine with the same paper machine structure, in particular dryer section structure.
  • the transverse expansion property resulting in the transverse direction and the work absorption capacity of the testliner paper web in the transverse direction can now be specifically controlled, adjusted or improved.
  • the method is characterized in that the testliner paper web is produced at a production speed of the paper machine of more than 1200 m/min, in particular more than 1400 m/min, in particular preferably more than 1600 m/min.
  • the process can be used particularly advantageously in high-speed paper machines.
  • the requirements for stable running properties in high-speed paper machines are very high and shrinkage-impeded drying sections are increasingly being used, for example single-row drying cylinder configurations.
  • optimal transverse stretch properties can be obtained, without a loss of running properties and without an increased risk of paper web breaks.
  • the method is characterized in that the testliner paper web has a basis weight in the range from 60 g/m 2 to 300 g/m 2 , in particular in the range from 70 g/m 2 to 160 g/m 2 .
  • This embodiment of the method according to the invention is particularly suitable for the production of testliner paper webs for use in packaging papers, in particular corrugated cardboard.
  • a fiber suspension for producing a testliner paper web comprises a proportion of fresh fibers, in particular wood pulp, cellulose or annual plants, and a proportion of recycled fiber components, preferably waste paper, between 50% and 100%, in particular greater than 50%, in particular greater than 70%, in particular greater than 80%, preferably greater than 90%.
  • This embodiment of the method according to the invention is particularly suitable for the production of testliner paper webs for use in packaging papers, in particular corrugated cardboard.
  • a fiber suspension for producing a testliner paper web comprises a proportion of recycled fiber components, preferably waste paper, of 100%.
  • the method is characterized in that a recycled fiber content, preferably waste paper, has an ash content between 10 and 25%, a freeness between 25 and 50 ° SR and a WRV between 95 and 130%.
  • a recycled fiber content preferably waste paper
  • This embodiment of the method according to the invention is particularly suitable for the production of testliner paper webs for use in packaging papers, in particular corrugated cardboard.
  • the method is characterized in that the testliner paper web is dried after the second drying section to a first dry content A of greater than or equal to 92%, in particular greater than or equal to 96%, in particular preferably greater than or equal to 98% .
  • the testliner paper web is re-moistened after the moistening unit to a second dry content B of less than or equal to 92%, preferably less than or equal to 80%.
  • testliner paper web is dried immediately after the moistening unit in a third drying section, preferably a third contactless drying section, to a third dryness content C of greater than or equal to 90%, preferably greater than or equal to 92%.
  • the method is characterized in that the testliner paper web has a shrinkage in the transverse direction after the drying section of above 0.2% and below 3.5%, in particular above 0.5%, in particular below 1.0% having.
  • the appropriate dry content ratios A, B, preferably C the corresponding shrinkage values in the testliner paper web can be set.
  • the machine for producing and/or processing a testliner paper web for packaging papers is suitable for carrying out the method according to the invention, and is characterized in that a moistening unit, preferably a double-sided nozzle moistener, is arranged immediately after the second drying section, designed in such a way that the testliner paper web is remoistened to a dry content B.
  • a moistening unit preferably a double-sided nozzle moistener
  • the second drying section is designed as an extended drying section, designed such that the testliner paper web is dried to a dry content A of greater than or equal to 96%, preferably greater than or equal to 98%. Higher shrinkage values can be achieved by drying or overdrying the testliner paper web.
  • the moistening unit preferably on both sides, in particular a nozzle moistener, preferably on both sides, is designed in such a way that the testliner paper web has a dry content B is re-moistened by less than or equal to 92%, in particular less than or equal to 80%, in particular preferably less than or equal to 78%.
  • a humidification unit in particular a nozzle humidifier
  • water is sprayed onto a finished paper web in order to give the paper web a desired, as uniform as possible moisture profile.
  • This enables advantageous shrinkage of the testliner paper web and, furthermore, the tendency of the edges of the testliner paper web to curl (“curl”) can be reduced or avoided.
  • the paper web is passed through a smoothing section, whereby a surface that is as uniform and particularly smooth as possible can be achieved.
  • a third drying section preferably a shrinkage-promoting two-row drying cylinder configuration and/or particularly preferably a contactless drying section with contactless drying units, is arranged immediately after the humidification unit.
  • the contactless drying units are advantageously designed as an impingement flow drying, floating drying, infrared drying and/or a combination of the above drying units which can be profiled in the transverse direction to the web running direction and are designed in such a way that the testliner paper web is again adjusted to a dry content C of more or equal to 90%, preferably more or equal to 92%, is dried.
  • the respective contactless drying units are arranged directly below and/or above the testliner paper web and the testliner paper web is guided through the drying units without stabilizing drying screens and/or felts. Due to the flexible control of the contactless drying units in relation to the regulation of heat transfer, it is advantageous to have a profilable setting over the transverse direction of the emitted heat, so that the shrinkage can be evened out across the transverse direction of the testliner paper web.
  • the machine is characterized in that the testliner paper web is produced at a production speed of the paper machine of more than 1200 m/min, in particular more than 1300 m/min, in particular preferably more than 1400 m/min.
  • FIG. 1 a A simplified, schematic process representation of a state-of-the-art paper machine for producing a testliner paper web with a winding section following a second drying section.
  • Fig. 1 b An alternative embodiment of Figure 1a to the prior art with a smoothing section arranged after the second drying section and before the winding section.
  • FIG. 2a A simplified, schematic process representation of a shrinkage-promoting embodiment variant of a paper machine from Figure 1a for producing a testliner paper web with a second, extended drying section and a moistening unit arranged immediately afterwards.
  • FIG. 2b A simplified, schematic process representation of a shrinkage-promoting embodiment variant of a paper machine from Figure 1a for producing a testliner paper web with a second drying section, an immediately following moistening unit and an immediately following third, preferably contactless, drying section.
  • FIG. 2c A simplified, schematic process representation of a shrinkage-promoting embodiment variant of a paper machine from Figure 1a for producing a testliner paper web with a second, extended drying section, an immediately following moistening unit and an immediately following third, preferably contactless, drying section.
  • FIG. 3a A simplified, schematic process representation of a shrinkage-promoting embodiment variant of a paper machine from Figure 1 b, with a smoothing section arranged in front of the winding section, for producing a testliner paper web with a second, extended drying section and a moistening unit arranged immediately afterwards.
  • Fig. 3b A simplified, schematic process representation of a shrinkage-promoting embodiment variant of a paper machine from Figure 1 b, with a smoothing section arranged in front of the winding section, for producing a testliner paper web with a second drying section, an immediately following moistening unit and an immediately following third, preferably contactless, drying section.
  • Fig. 3c A simplified, schematic process representation of a shrinkage-promoting embodiment variant of a paper machine from Figure 1 b, with a smoothing section arranged in front of the winding section, for producing a testliner paper web with a second, extended drying section, an immediately following moistening unit and an immediately following third, preferably contactless, drying section.
  • FIG. 1 a shows an exemplary embodiment corresponding to the state of the art in a schematic process representation of a machine 1 for producing a testliner paper web 2.
  • the arrangement for the method and the machine 1 includes a forming section 3 for applying a fibrous suspension to commonly used forming fabrics (not shown) and for the first dewatering of a testliner paper web 2 newly formed from the fibrous suspension. This is followed by further dewatering in a normally used one Press section 4. This is followed by a first drying section 5, which receives the testliner paper web 2 from a previous press section 4 and the testliner paper web 2 on a usually permeable (endless), not shown, drying screen and/or felt and/or elastic band further drained. Immediately after the first drying section 5, the testliner paper web 2 is guided into a coating section 6 for an application of an application medium. This preferably serves to increase the strength properties and/or to improve the optical properties.
  • the application of starch, NFC (nano-fibrillated cellulose) and/or MFC (micro-fibrillated cellulose) to the testliner paper web is carried out, for example, using a size press.
  • a liquid or pasty application medium is usually applied to the testliner paper web 2.
  • Both the starch and/or the other application media contain a proportion of moisture, which is also applied to the testliner paper web 2, which reduces the dry content of the testliner paper web 2 reached after the first drying section and in a immediately following the coating section 6 second Drying section 7 or post-drying section is dewatered or dried again.
  • the second drying section 7 can be designed as a single-row drying cylinder configuration with very high running properties requirements, but this configuration does not promote shrinkage.
  • a combination of a single-row and two-row drying cylinder configuration can be used or a pure two-row drying cylinder configuration, whereby the two-row drying cylinder configuration can dry more shrinkage-promoting than the single-row drying cylinder configuration, but is less shrinkage-promoting compared to a non-contact drying section.
  • the testliner paper web 2 has reached a corresponding dry content A immediately after leaving it.
  • testliner paper web 2 is wound up in a winding section 11 following the second drying section 7, usually into so-called testliner paper web drums, which are then used for further use, for example in creasing, folding, not shown. and/or roll cutting machines can be further processed.
  • FIG. 1 b shows an exemplary embodiment corresponding to the state of the art in a schematic process representation of a machine 1 for producing a testliner paper web 2.
  • the smoothing section 10 following the second drying section is additionally smoothed to further improve the surface properties of the testliner paper web 2, whereby a surface that is as uniform and particularly smooth as possible is achieved.
  • a winding section 11 following the smoothing section 10 the finished testliner paper web 2 is wound up, usually into so-called testliner paper web reels, which are then further processed for further use, for example in creasing, folding and/or slitting machines (not shown).
  • This embodiment is advantageously used when there are greater demands on the surface properties of the testliner paper web 2.
  • Figures 2a, 2b and 2c show exemplary embodiments according to the invention in schematic process representations of a method and a respective one Machine arrangement 1 for producing a testliner paper web 2 with shrinkage-promoting drying, comprising a moistening unit 8.1, 8.2, 8.3, in particular a nozzle moistener.
  • a moistening unit 8.1, 8.2, 8.3, in particular a nozzle moistener comprising a moistening unit 8.1, 8.2, 8.3, in particular a nozzle moistener.
  • the same reference numbers as in Figure 1a are used and the changes are discussed.
  • Figure 2a shows an exemplary embodiment according to the invention of the method and the machine arrangement 1 for shrinkage-promoting drying of a testliner paper web 2, which has an increased dry content A, in particular greater than or equal to 96%, in particular preferably greater than or equal to 98%, after the second drying section 7.1 reached.
  • the second drying section 7.1 is immediately followed by a double-sided humidification unit 8.1, in particular a double-sided nozzle humidifier 8.1.
  • the double-sided moistening unit 8.1 the testliner paper web 2 dried to a dryness content A, in particular greater than or equal to 96%, in particular preferably greater than or equal to 98%, in the second drying section 7.1 is brought to a dryness content B, preferably greater than or equal to 90%.
  • re-humidified after the humidification unit 8.1 in particular greater than or equal to 92%.
  • the re-humidification is preferably carried out with water, so that the dry content B after the humidification unit is lower than the dry content A after the second drying section 7.1 or before the humidification unit 8.1.
  • the testliner paper web 2 is then wound up in a subsequent winding section 11.
  • the advantageous moistening of the testliner paper web 2 on both sides advantageously creates a shrinkage effect and avoids the edge areas of the testliner paper web from bending up (“curl”).
  • FIG. 2b shows an exemplary embodiment according to the invention of the method and the machine arrangement 1 for shrinkage-promoting drying of a testliner paper web 2, which has a dry content A, in particular greater than or equal to 90%, in particular preferably greater than or equal to 92%, after the second drying section 7 reached.
  • the second drying section 7 is immediately followed by a double-sided moistening unit 8.2, preferably a double-sided one Humidification unit 8.2, particularly preferably a double-sided nozzle humidifier 8.2.
  • the testliner paper web 2 which has been dried to a dryness content A, in particular greater than or equal to 90%, in particular preferably greater than or equal to 92%, in the second drying section 7 is brought to a dryness content B, in particular less than or equal to 80%. in particular preferably less than or equal to 78%, re-humidified after the humidification unit 8.2.
  • the re-moistening is preferably carried out with water, so that the dry content B after the moistening unit reaches the optimal dry content value for shrinkage-promoting drying of the testliner paper web 2 after the moistening unit 8.2 or before a third, preferably contactless, drying section 9.2.
  • testliner paper web 2 is dried in a third, preferably non-contact, drying section 9.2 to promote shrinkage without hindrance by drying screens to a dry content C, in particular greater than or equal to 90%, particularly preferably greater than or equal to 92%.
  • the testliner paper web 2 is then wound up after the third drying section 9.2 with a dryness content C in a following winding section 11.
  • Figure 2c shows an exemplary embodiment according to the invention of the method and the machine arrangement 1 for shrinkage-promoting drying of a testliner paper web 2, which has an increased dry content A, in particular greater than or equal to 96%, in particular preferably greater than or equal to 98%, after the second drying section 7.1 reached.
  • the second drying section 7.1 is immediately followed by a double-sided moistening unit 8.3, preferably a double-sided moistening unit 8.2, particularly preferably a double-sided nozzle moistener 8.3.
  • the testliner paper web 2 dried up to a dry content A, in particular greater than or equal to 96%, in particular preferably greater than or equal to 98%, in the second drying section 7.1 is brought to a dry content B, in particular less than or equal to 80%. in particular preferably less than or equal to 78%, re-humidified after the humidification unit 8.3.
  • the rewetting is preferably carried out with water, so that the dry content B after Humidification unit reaches the optimal dry content value for shrinkage-promoting drying of the testliner paper web 2 after the moistening unit 8.3 or before a third, preferably contactless, drying section 9.3.
  • testliner paper web 2 is dried in a third, preferably non-contact, drying section 9.3 to promote shrinkage without hindrance by drying screens to a dry content C, in particular greater than or equal to 90%, in particular preferably greater than or equal to 92%.
  • the testliner paper web 2 is then wound up after the third drying section 9.2 with a dryness content C in a following winding section 11.
  • Figures 3a, 3b and 3c show exemplary embodiments according to the invention in schematic process representations of a method and a respective machine arrangement 1 for producing a testliner paper web 2 with shrinkage-promoting drying based on Figure 1b.
  • the testliner paper web 2 produced in the embodiments in Figure 3a, 3b and 3c have increased requirements for the surface properties and the arrangements correspond to the descriptions of the corresponding figures 2a, 2b, 2c and the testliner paper web 2 is further processed with a smoothing section 10 arranged in front of the winding section 11 before it is wound up in the winding section 11 .
  • a further analogous description is therefore omitted here.

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Abstract

L'invention concerne un procédé et une machine permettant de sécher de manière à favoriser la contraction une bande de papier formant couverture spéciale (2) de papiers d'emballage, ladite machine comprenant une partie de formage (3) destinée à former et à égoutter la bande de papier formant couverture spéciale (2), une section de pressage (4) et au moins deux sécheries (5, 7, 1) comportant une première sécherie (5) et une seconde sécherie (7.1), destinées à poursuivre l'égouttage de la bande de papier formant couverture spéciale (2), une partie de couchage (10) étant disposée après la première sécherie (5) et avant la seconde sécherie(7.1) et étant destinée à appliquer un agent d'application sur la bande de papier formant couverture spéciale (2), ladite machine comprenant en outre, de préférence après la seconde sécherie (7.1), une partie de lissage (10) destinée lisser la bande de papier formant couverture spéciale (2) et une partie d'enroulement (11) pour enrouler la bande de papier formant couverture spéciale (2). Selon l'invention, la bande de papier formant couverture spéciale (2) est séchée après la seconde sécherie (7.1) pour parvenir à une première siccité A, puis est réhumidifiée dans un organe d'humidification (8.1) situé immédiatement à la suite, de préférence un humidificateur à buses (8.1) à deux faces, de manière à parvenir à une seconde siccité B, inférieure à la première siccité A.
PCT/EP2023/062134 2022-05-20 2023-05-08 Procédé et machine permettant d'augmenter l'allongement transversal d'une bande de papier formant couverture spéciale dans des machines à papier à grande vitesse WO2023222430A1 (fr)

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DE102022112687.0 2022-05-20
DE102022112687.0A DE102022112687A1 (de) 2022-05-20 2022-05-20 Verfahren und Maschine zur Erhöhung der Querdehnung einer Testliner-Papierbahn in Hochgeschwindigkeits-Papiermaschinen

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DE4110875A1 (de) 1991-04-04 1992-10-08 Voith Gmbh J M Trockenpartie
DE4428745A1 (de) 1994-08-13 1996-02-15 Voith Gmbh J M Einrichtung zum Trocknen einer laufenden Bahn
EP2876206A1 (fr) * 2013-11-21 2015-05-27 Valmet Technologies, Inc. Procédé de production de bandes de fibres et ligne de fabrication de bandes de fibres
WO2016083170A1 (fr) * 2014-11-28 2016-06-02 Voith Patent Gmbh Procédé et dispositif de fabrication de papier d'emballage
EP3835482A1 (fr) * 2019-12-12 2021-06-16 Voith Patent GmbH Machine et procédé de fabrication d'une bande de matière fibreuse

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