EP0989232B1 - Section de séchage - Google Patents

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Publication number
EP0989232B1
EP0989232B1 EP99112926A EP99112926A EP0989232B1 EP 0989232 B1 EP0989232 B1 EP 0989232B1 EP 99112926 A EP99112926 A EP 99112926A EP 99112926 A EP99112926 A EP 99112926A EP 0989232 B1 EP0989232 B1 EP 0989232B1
Authority
EP
European Patent Office
Prior art keywords
drying section
impingement
section according
flow
material web
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.)
Expired - Lifetime
Application number
EP99112926A
Other languages
German (de)
English (en)
Other versions
EP0989232A2 (fr
EP0989232A3 (fr
Inventor
Markus Oechsle
Tri Chau-Huu
Roland Mayer
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
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0989232A2 publication Critical patent/EP0989232A2/fr
Publication of EP0989232A3 publication Critical patent/EP0989232A3/fr
Application granted granted Critical
Publication of EP0989232B1 publication Critical patent/EP0989232B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders
    • 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
    • D21F5/18—Drying webs by hot air

Definitions

  • the invention relates to a dryer section of a machine for producing a material web, in particular paper or cardboard web, with at least one Pratlströmung drier for unilaterally applying a hot air and / or superheated steam impingement to the material web, the material web having its opposite side, in each case being acted upon by the Prali flow Side over an open, ie not smooth support surface is performed.
  • the paper web is guided for drying over several steam-heated cylinders or over an arrangement of several steam-heated cylinders and screen suction rolls.
  • problems often arise with regard to the web guidance, which are in particular due to the fact that the still wet web sticks to the smooth contact surfaces, which are absolutely necessary for adequate heat transfer are. This often leads to web breaks and overstretching of the web edges. As a result, it is usually necessary to ensure that drying takes place more slowly, which means that the required drying section as a whole is longer.
  • the problems mentioned above occur increasingly at higher web speeds.
  • the aim of the invention is to create a dryer section of the type mentioned at the beginning, with which both an optimum drying rate and thus the smallest possible overall length of the dryer section are possible as well as a safe one Web guidance is guaranteed.
  • the material web is thus supported by the deck screen.
  • This deck screen holds the material web on the support surface and also transports it in the event of a possible tear, so that no scrap can get caught in the respective impingement flow dryer.
  • At least one impingement flow dryer is expediently provided with a steam suction which serves for simultaneous evaporation. As a result, it is no longer necessary to switch between heating up and evaporation. With the elimination of the additional evaporation surface, the entire barrel length is further reduced.
  • An expedient practical embodiment of the dryer section according to the invention is characterized in that the material web is guided over an in particular larger support roller and the open support surface is formed either by the surface or a cover or covering of the support roller or by the surface of an endless belt guided over the support roller.
  • the relatively large back-up roller ensures safe and precise guidance with a constant radius of curvature. After the support roller no longer has to be designed as a pressure vessel, it can be relatively large in order to provide a correspondingly larger drying area.
  • the back-up roller can, for example, have an outer diameter in the range from approximately 2 to approximately 10 m.
  • the open support surface is formed by the surface of an endless belt guided over the support roller, this endless belt can in particular be formed by an air-permeable screen.
  • this endless belt can in particular be formed by an air-permeable screen.
  • the use of an air-impermeable conveyor belt is also conceivable, for example.
  • the open support surface can be formed, for example, by a shrink screen applied to the support roller.
  • the open support surface is formed by the surface of a support belt guided over a plurality of support rollers.
  • the open support surface can also be guided at least in sections, e.g. via a variety of support rollers.
  • an open support surface which is slightly curved at least in sections is also conceivable.
  • the support rollers are arranged on an arc.
  • the support band can in particular also be polygonal.
  • compressed air can be applied to the material web at least in the removal area through the support surface.
  • a support roller this can be provided or perforated with a grid structure, for example, and compressed air or the like can be applied to it on the inside at least in regions.
  • a support roller can then be pressurized on the inside at least in the removal area in which the material web and possibly also a cover screen is removed from the support roller.
  • the temperature of the compressed air is expediently higher than about 20 ° C.
  • At least one impingement flow dryer is provided, which generates a hot air or superheated steam impingement flow with a temperature in the range from approximately 150 ° to approximately 450 ° C.
  • At least one impingement flow dryer with a plurality of high-performance nozzles is preferably used, these high-performance nozzles expediently being at the same constant distance from the material web during operation. This distance can be, for example, in the range from approximately 10 to approximately 50 mm.
  • At least one impingement flow dryer is preferably provided with at least one dryer hood, wherein such a dryer hood can advantageously be divided into zones in the web running direction and / or transversely to the web running direction.
  • the paper quality can be influenced in the desired manner by zone-by-zone heating and drying. In particular, certain corrections to moisture cross profiles are possible.
  • At least one impingement flow dryer can be provided, for example, in an initial area of the dryer section. Additionally or alternatively, at least one such impingement flow dryer can also be provided in a main evaporation zone of the dryer section. Additionally or alternatively, at least one impingement flow dryer can also be provided in an end region of the drying section. This results in an even higher drying rate, which further shortens the drying section overall.
  • At least one drying group with at least one drying cylinder is expediently provided and at least one impingement flow dryer is preferably arranged upstream of this drying group in the web running direction, the material web preferably already having a dry content when it reaches the first drying cylinder, which is higher than approximately 55 to approximately 70%.
  • the material web after transfer from the press and drying on a back-up roll dryer, the material web can be dried from one side to the other along a straight line or slightly curved sections by impingement flow dryers located opposite one another to a dry content of, for example, about 55 to about 70%.
  • impingement flow dryers located opposite one another to a dry content of, for example, about 55 to about 70%.
  • the material web is always supported by a non-smooth surface, so that the material web, which is still relatively moist, is not at any point must be removed from a smooth surface.
  • a multi-cylinder dryer group can then follow, for example.
  • the straight impingement dryer unit can, for example, be supplied with a second sieve as a supporting sieve.
  • the paper web can also be transferred to two new screens, for example.
  • the material web can, for example, also be acted upon on both sides by a respective hot air or hot steam impingement flow.
  • a corresponding impingement flow dryer can also be provided on only one side, while, for example, a plurality of support rollers can be arranged on the opposite side.
  • the material web is subjected to a hot air or hot steam impingement flow from one side, on which a plurality of support rollers is arranged.
  • the application takes place in particular through the area located between the support rollers.
  • the material web can be acted upon at different points from the same side or also from different sides with a respective hot air or hot steam impingement flow.
  • the dryer section 12 comprises an overhead impingement dryer 16, through which the material web 14 is subjected to a hot air and / or superheated steam impingement on one side.
  • the material web 14 is with its side opposite the impingement dryer 16 over an open, i.e. not smooth support surface led.
  • the material web 14 is guided together with a deck screen 18 over a larger support roller 20, which is wrapped in a bottom screen 20, which forms the open support surface in the present case.
  • the subsequent removal of the material web 14 and the deck screen 18 is consequently facilitated by this endless belt or bottom screen 22.
  • the material web 14 is guided together with the cover screen 18 around a suction roller 24, whereupon it is fed to a single-row drying group with a plurality of drying cylinders 26 and suction rollers 28 located in between.
  • the deck screen 18 is again separated from the material web 14 in the region of the first drying cylinder 26.
  • the material web 14 is transferred in a closed train from the last press nip of the press section 10 to the impingement flow dryer 16.
  • the material web 14 is supported by the deck screen 18 and led to the large support roller 20 on which the lower wire 22 runs.
  • the large support roller 20 ensures safe and exact guidance of the two screens 18, 22 with the material web 14 in between, with a constant radius of curvature. As a result, and due to the low sieving tension required, damage to the material web 14 is excluded.
  • the support roller 20 no longer has to be designed as a pressure vessel and can therefore be significantly larger, as a result of which a larger drying area is made available.
  • the deck screen 18 is expediently particularly open, thin and resistant to high temperatures in order to enable good impingement drying. It has the task of holding the material web 14 on the support roller 20 and of transporting it even if it breaks off, so that no scrap can get caught in the dryer hood of the impingement flow dryer 16 provided with several high-performance nozzles.
  • the bottom wire 22 allows the material web 14 to be easily removed from the support roller 20. It does not have to be as open as the cover wire 18, but should nevertheless be impermeable to air. Both screens 18, 22 can be cleaned in the return.
  • the dryer hood of the impingement flow dryer 16 can be divided into longitudinal zones and have transverse zones for moisture profile correction.
  • the dryer hood should be divided as possible so that it can be lifted off the support roller 20.
  • the high-performance nozzles are at a constant distance from the surface of the material web 14, which distance can be, for example, in a range from approximately 10 to approximately 50 mm.
  • the web of material 14 is supported by a press felt 30 of the press section 10 in a closed train through the top screen 18 supported by the support roller 20, the top screen 18 both in the area of the transfer of the web of material 14 from the press felt 30 and in the area of the transfer of the Material web 14 is guided onto the support roller 20 via a suction roller 32.
  • the material web 14 to be dried is consequently guided after the press section 10 between two open temperature-resistant screens 18, 22 around a large support roller 20 on which the drying hood of an impingement flow dryer 16 provided with high-performance nozzles is installed.
  • the flow velocity of the hot air and / or hot steam impingement flow concerned can be, for example, in a range from approximately 60 to approximately 120 m / s.
  • the temperature of this impingement flow can be, for example, in a range from approximately 150 to approximately 450 ° C. Basically, for example, the use of gas or steam heated hot air or superheated steam is possible.
  • the material web 14 After a dry content of about 55 to about 70% has been reached, the material web 14 has sufficient strength and is now completely dried in a preferably single-row (possibly also two-row) cylinder dryer group.
  • a backup roll impingement dryer 16 can alternatively or additionally be installed, for example, in the closing part of the drying section 12 and / or in the main evaporation zone.
  • the drying performance at the beginning is only limited by influencing the paper quality when the drying speed is too high and no longer by the web guidance of the moist material web.
  • the more flexible and faster controllable baffle nozzle hood which is divided into longitudinal and transverse zones, enables the paper quality to be influenced.
  • targeted heating and drying at the start and correction of moisture cross profiles are possible.
  • the cross-shrinkage hindrance can be varied within limits due to the screen tension, since pressing on heating surfaces is no longer necessary.
  • the deck screen 18 can be made of plastic or metal, for example.
  • the bottom wire 22 can be replaced by an impermeable conveyor belt. To form the non-smooth support surface, however, such a conveyor belt should also have a correspondingly open, ie not closed, surface.
  • the transfer of the material web 14 from the press section 10 to the impingement flow dryer can be supported by a transfer foil in addition to the cover screen 18 or by an additional transfer felt 36, as indicated for example in FIG. 3.
  • a drying hood can also use superheated steam operate.
  • the roll jacket can be cooled via coolant channels or from the inside.
  • the endless belt 22 for example formed by a bottom wire and provided with an open surface, can then be constructed in multiple layers with a coarser structure on the roller side in order to remove condensed water.
  • the lifting of the material web 14 from the deck screen 18 during transfer to and removal from the impingement flow dryer 16 is prevented by suction rollers 32 and 24, respectively.
  • Grooved rollers or transfer foils can also be provided for this purpose.
  • FIG. 2 shows a further embodiment of a dryer section 14 with two impingement dryer 16 opposite a respective larger support roller 20, through which the material web is acted on from different sides.
  • the front impact flow dryer 16 viewed in the web running direction L, is arranged at the top and the rear impact flow dryer 16 is arranged at the bottom.
  • the support roller 20 assigned to the front impact flow dryer 16 lies below and the support roller 20 assigned to the rear impact flow dryer 16 lies above.
  • Each of these two support rollers is wrapped around, for example, by a lower wire 22.
  • the material web 14 is again guided together with a deck screen 18 over the large support roller 20 in question.
  • the material web 14 is finally taken over by a dryer fabric 34 from the rear deck fabric 18.
  • the single deck screen 18 provided there is separated from the material web 14 before it is brought together with the drying screen 34.
  • the material web 14 supported by the deck screen 18 is only guided over a single suction roller 32.
  • the baffle flow dryer 16 viewed in the web running direction L is 16 arranged below and the rear impingement flow dryer 16 above.
  • the front large support roller 20 is at the top and the rear large support roller 20 is at the bottom.
  • the front support roller 20 has a smaller diameter than the rear support roller 20.
  • the transfer of the material web 14 from the press section 10 to the front impingement flow dryer 16 or the large support roller 20 associated therewith takes place without free tension via an additional transfer felt 36 this transfer felt 36, the material web is finally taken over by the cover screen 18 guided over the front support roller 20, this cover screen 18 being guided in the take-over area over a suction roller 32.
  • the material web 14 is also transferred in the present case from the cover screen guided over the front support roller 20 in the region of two suction rollers 24 to the cover screen 18 guided over the rear support roller 20.
  • the two large support rollers 20 are each wrapped, for example, by a lower wire 22. While in the exemplary embodiment according to FIG.
  • the two large support rollers 20 are each wrapped around, for example, by a lower wire 22.
  • FIG. 4 shows an embodiment of a dryer section 14 with two upper impingement flow dryers 16 assigned to a respective lower large support roller 20, through which the material web 14 is acted on from the same side.
  • a common cover screen 18 is guided over the two lower support rollers 20.
  • the two support rollers 20 are each looped around by a bottom wire 22 forming the open support surface.
  • FIG. 5 shows a further embodiment of a dryer section, in which the material web 14 is guided between the deck screen 18 and the bottom screen 22 via a plurality of support rollers 38 arranged on a circular arc.
  • the open support surface which facilitates the removal of the material web 14 and the deck screen 18, is again formed in this case by the bottom screen 22.
  • the material web 14 is again guided between the two screens 18 and 22 past the impingement flow dryer 16 arranged above.
  • the so-called curl tendency is reduced by drying in succession from both sides in the embodiments according to FIGS. 2 and 3.
  • the bottom wire 22 can in principle also be omitted.
  • the open support surface can be formed by the surface or a cover or covering of the relevant support roller 20.
  • a shrinking screen or the like can be applied to the support roller 20 in question, or the support roller 20 in question can be provided with a coated surface.
  • the respective back-up roller can, for example, have a solid jacket or spoke / grid construction and can also be a polygon.
  • the support can also be provided by a large number of small support rollers 38 which are arranged on an arc of a circle, so that the curvature of the material web 14 between the screens 18, 22 remains approximately constant.
  • the illustrated embodiments can also be used for installation in the main evaporation zone or in the end part of the drying section 12 in question, which also applies to the remaining embodiments described below.
  • FIG. 6 shows an embodiment of a drying section 14, in which a plurality of impingement flow driers 16 lying at the top lie opposite a common support belt 40, over which the material web 14 is guided together with a cover screen 18 formed by a drying screen.
  • a support roller 20 in question (see the previous exemplary embodiments) is replaced by the support belt 40 guided over a plurality of support rollers 38.
  • the material web 14 is again taken over in a closed guide in the area of a suction roll 32 by a press felt 30 of the press section 10 and fed to the support belt 40 through the cover screen 18.
  • three impingement flow dryers 16 are provided, whereby the material web 14 in the region of these impingement flow dryers 16 is in each case guided in a straight line or slightly curved.
  • the material web 14 has reached, for example, a drying content of about 60% following the last impingement dryer 16.
  • the open support surface which enables easier removal, is in the present case provided by a correspondingly open, i.e. not closed surface of the support band 40 is formed.
  • This support band 40 can be formed, for example, by a metal band, a foil or an air-impermeable fabric. Compared to a backup roller, the support belt 40 brings i.a. the advantage that it is easier to manufacture and easier to transport. This support band 40 should be so stable that it does not vibrate when it is subjected to the impingement flow dryer 16.
  • FIG. 7 shows an embodiment of the dryer section 14 with two impact flow dryers 16 located at the top, each of which is assigned to a large support roller 20 located at the bottom, and with two impact flow dryers 16 ′, 16 ′′ arranged one above the other for acting on the material web 14 on both sides, the Material web 14 is passed straight between the two impingement flow dryers 16 ', 16 "one above the other.
  • the material web 14 is again in the area of a suction roller 32 by a porous cover band 18 made of metal or plastic from a press felt 30 Press section 10 taken over and fed in the area of a further suction roller 32 to the front large support roller 20, from which it is removed again together with the cover wire 18 in the area of a further suction roller 24, in order subsequently between the cover wire 18 and a further wire belt 42 made of metal or plastic to be passed along a straight path between the two impingement flow dryers 16 ', 16 "lying one above the other.
  • the material web 14 and the cover screen 18 are again separated from the lower screen belt 42 in the area of a suction roller 24 and onto the rear support roller 20 located below , from which they are removed again in the area of a further suction roll 24 and are continued in a straight line to a subsequent suction roll 24.
  • the material web 14 is finally separated from the deck wire 18 and taken over by a drying wire 34 through which it again a single-row dry gr uppe from several drying cylinders 26 with associated suction rolls 28 is supplied.
  • the deck screen 18 is guided over both the front and the rear large support roller 20.
  • the material web is dried from above by the two impingement flow dryers 16.
  • the two impingement flow dryers 16 ', 16 "between them dry the material web 14 on both sides.
  • the two support rollers 20 are each a grated support roller covered with a screen stocking. The diameter of these support rollers 20 can in particular be greater than approximately 2 m his.
  • the large support rollers 20 can be pressurized from the inside to cause the material web 14 to be blown off at the respective take-off point.
  • the front support roller 20, viewed in the web running direction L, is pressurized on the inside as a whole, while in the rear large support roller 20 such an internal pressurization is only provided locally, specifically in the removal area.
  • a cover 44 is provided in the lower region of the front support roller, which is not covered by the deck screen 18, by means of which the compressed air flow that supports the removal is concentrated on the removal area.
  • the transfer zone is, for example, about 500 mm wide.
  • the compressed air temperature is greater than about 20 ° C.
  • At least some of the impingement flow dryers 16, 16 ', 16 can be designed to generate a respective hot air or superheated steam impingement flow whose flow speed is greater than or equal to approximately 100 m / s and whose temperature is approximately greater than or equal to 150 ° C.
  • the material web 14 is first dried on a large support roller 20, then on a slightly curved support surface and then again on a large support roller 20.
  • a cover screen 18, which is also guided over the two large support rollers 20, is guided over a plurality of support rollers 38 lying in a correspondingly curved plane.
  • the two impingement flow dryers 16 are each arranged below the relevant support roller 20.
  • the material web 14 is thus dried from below by these two impingement flow dryers 16.
  • an impact flow dryer 16 '" is provided, which is arranged above the support rollers 38 and consequently ensures that the material web 14 is dried from above.
  • the material web 14 is between the deck sieve 18 and an overhead sieve belt 42 made of metal or plastic along a path curved slightly upward toward the impingement flow dryer 16 ′′ ′′ past this impingement flow dryer 16 ′′ ′′ for this purpose, a plurality of support rollers 38 located at the bottom and lying in a correspondingly curved plane are provided 7, there is no drying from the side of the support rollers 38 in the present case.
  • an impingement flow dryer 16 is also provided on the side of the support rollers 38.
  • the support rollers 38 located below are also arranged in one plane.
  • the support rollers 20 are again formed by latticed support rollers, each of which is covered with a sieve stocking and whose diameter can be greater than approximately 2 m.
  • a respective internal blow box assigned to the support rollers 20 again serves to detach the web and clean the screen.
  • a local pressurization is provided for the front support roller 20, while the rear support roller 20 is pressurized overall on the inside.
  • the rear support roller 20 is assigned a cover 44 in order to concentrate the compressed air flow accordingly on the removal area.
  • the compressed air temperature can be greater than about 20 ° C, for example.
  • the two large support rollers 20 are each supplied with compressed air via a common compressed air source 46 in the exemplary embodiments concerned.
  • Figure 9 shows a further embodiment of a dryer section 14, in which the material web 14 following the press section 10 first for one-sided drying by an overhead impingement dryer 16 over a large support roller 20 underneath which is wrapped by a lower wire 22 and then for drying on both sides is passed in a straight line between two impingement flow dryers 16 ', 16 "lying one above the other. Between the two impingement flow dryers 16', 16", which serve drying on both sides, the material web 14 is guided between the cover screen 18, which is also guided over the support roller 20, and a further screen belt 48.
  • the material web 14 is thus in a straight line area, which for example can also be slightly curved, by two superimposed impact flow dryers 16 ', 16 " Dried on both sides at the same time, for example, up to a dry matter content of 55 to about 70%
  • a single dryer covering the material web and correspondingly acting on both sides can also be provided for such drying on both sides supports at least one fabric so that it never has to be pulled off a smooth surface.
  • the material web 14 is again fed to a dryer group comprising a plurality of drying cylinders 26 with associated suction rolls 28.
  • the deck screen 18 is also passed through the area between the two impingement flow dryers 16 ', 16 "lying one above the other.
  • the additional screen belt 48 is fed as a support screen.
  • the material web 14 can also be transferred to two new screens
  • a plurality of support rollers can also be provided again, in the present case a single-row drying group comprising a plurality of drying cylinders 26 with associated suction rollers 28 is also provided, but in principle, for example, a two-row drying group is also conceivable here.
  • a supported, draft-free web guide up to, for example, about 60% to about 70% dry content is thus possible, as a result of which the previous tear-off problems in this area are eliminated. Higher drying rates are possible, which results in a correspondingly shorter and more compact drying section. Negative effects on the paper properties are practically excluded.
  • the impingement flow dryer can be used especially after pressing with subsequent single-tier dryer groups. If necessary, the variants described can be extended to the end of the dryer section. In principle, however, it is also conceivable to use the impingement flow dryer in a main evaporation zone of the dryer section. In principle, the use of impact flow dryers in connection with multi-row dryer groups is also conceivable.

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  • Drying Of Solid Materials (AREA)
  • Paper (AREA)

Claims (47)

  1. Section de séchage (12) d'une machine de fabrication d'une bande de matière (14), en particulier d'une bande de papier ou de carton, avec au moins un séchoir à flux par impact (16) pour l'exposition de la bande de matière (14) sur une seule face à un flux par impact d'air chaud ou de vapeur chaude, dans laquelle la bande de matière (14) est guidée, avec sa face respectivement opposée à une face exposée au flux par impact, sur une surface d'appui ouverte, c'est-à-dire non lisse, caractérisée en ce que la bande de matière (14) est guidée sur la surface d'appui en même temps qu'une toile de recouvrement (18) située entre la bande de matière (14) et le séchoir à flux par impact (16) correspondant.
  2. Section de séchage selon la revendication 1, caractérisée en ce qu'au moins un séchoir à flux par impact (16) est pourvu d'une aspiration de vapeur servant à l'évaporation simultanée.
  3. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de matière (14) est guidée sur un cylindre d'appui (20) en particulier plus grand et la face d'appui ouverte est formée soit par la surface respectivement un revêtement ou un recouvrement du cylindre d'appui (20) soit par la surface d'une bande sans fin (22) guidée sur le cylindre d'appui (20).
  4. Section de séchage selon la revendication 3, caractérisée en ce que le cylindre d'appui (20) a un diamètre extérieur compris dans une plage d'environ 2 à environ 10 m.
  5. Section de séchage selon la revendication 3 ou 4, caractérisée en ce que la face d'appui ouverte est formée par la surface d'une bande sans fin (22) guidée sur le cylindre d'appui (20) et cette bande sans fin est formée par une toile perméable à l'air.
  6. Section de séchage selon la revendication 4 ou 5, caractérisée en ce que la face d'appui ouverte est formée par la surface d'une bande sans fin (22) guidée sur le cylindre d'appui (20) et cette bande sans fin (22) est formée par une bande transporteuse imperméable à l'air.
  7. Section de séchage selon la revendication 4 ou 5, caractérisée en ce que la face d'appui ouverte est formée par une toile rétractable déposée sur le cylindre d'appui (20).
  8. Section de séchage selon l'une quelconque des revendications précédentes 3 à 7, caractérisée en ce que le cylindre d'appui (20) présente une structure à enveloppe pleine ou à rayons et grille.
  9. Section de séchage selon la revendication 1 ou 2, caractérisée en ce que la face d'appui ouverte est formée par la surface d'une bande d'appui (40, 18, 22) guidée sur plusieurs rouleaux d'appui (38).
  10. Section de séchage selon la revendication 9, caractérisée en ce que les rouleaux d'appui (38) sont disposés sur un arc de cercle.
  11. Section de séchage selon la revendication 9 ou 10, caractérisée en ce que la bande d'appui (22) est guidée en forme de polygone.
  12. Section de séchage selon la revendication 9, caractérisée en ce que les rouleaux d'appui (38) sont situés dans un plan ou dans une face légèrement courbe.
  13. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que la face d'appui ouverte est plane au moins par portions.
  14. Section de séchage selon l'une quelconque des revendications 9 à 12, caractérisée en ce que la bande d'appui (40, 18, 22) est constituée de métal ou de matière plastique.
  15. Section de séchage selon l'une quelconque des revendications 9 à 12, caractérisée en ce que la bande d'appui (40, 18, 22) est imperméable à l'air et se compose de préférence d'un tissu imperméable à l'air.
  16. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que la toile de recouvrement (18) est constituée de matière plastique ou de métal.
  17. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de matière (14) peut être exposée à l'air comprimé à travers la face d'appui au moins dans une zone d'enlèvement dans laquelle elle est enlevée de la face d'appui.
  18. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de matière (14) est guidée sur un cylindre d'appui (20) perforé ou pourvu d'une structure de grille, qui est exposé sur sa face intérieure, au moins par portions, à de l'air comprimé ou analogue.
  19. Section de séchage selon la revendication 18, caractérisée en ce que le cylindre d'appui (20) est exposé sur sa face intérieure à de l'air comprimé au moins dans la zone d'enlèvement dans laquelle la bande de matière et éventuellement aussi la toile de recouvrement (18) est enlevée du cylindre d'appui.
  20. Section de séchage selon la revendication 19, caractérisée en ce que la température de l'air comprimé est supérieure à environ 20°C.
  21. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que l'on produit avec au moins un séchoir à flux par impact (16) un flux par impact d'air chaud ou de vapeur chaude, dont la température est située dans la plage d'environ 150 à environ 450°C.
  22. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un séchoir à flux par impact (16) est pourvu d'une pluralité de buses à haute puissance.
  23. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un séchoir à flux par impact (16) est pourvu d'au moins une hotte de séchoir.
  24. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins deux cylindres d'appui (20) situés l'un après l'autre dans le sens de défilement de la bande (L) et associés chaque fois à un séchoir à flux par impact (16), et en ce que les différents cylindres d'appui (20) présentent au moins en partie un diamètre différent.
  25. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un séchoir à flux par impact (16) est pourvu d'une hotte de séchoir divisée en zones dans le sens de défilement de la bande (L) et/ou transversalement au sens de défilement de la bande (L).
  26. Section de séchage selon la revendication 22, caractérisée en ce que les buses à haute puissance de chaque séchoir à flux par impact (16) présentent pendant le fonctionnement une même distance constante par rapport à la bande de matière (14).
  27. Section de séchage selon la revendication 26, caractérisée en ce que la distance se situe dans la plage d'environ 10 à environ 50 mm.
  28. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que la vitesse d'écoulement respective d'un flux d'impact d'air chaud respectivement de vapeur chaude se situe dans la plage d'environ 60 à environ 120 m/s.
  29. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un séchoir à flux par impact (16) situé en position haute est associé à une face d'appui située en position basse.
  30. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un séchoir à flux par impact (16) situé en position basse est associé à une face d'appui située en position haute.
  31. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que la bande de matière (14) peut être exposée en même temps sur les deux faces, dans au moins une zone, à un flux par impact d'air chaud et/ou de vapeur chaude, dans laquelle elle est guidée à travers cette zone de préférence entre deux bandes de toile (18, 42 ; 18, 48).
  32. Section de séchage selon la revendication 31, caractérisée en ce que la bande de matière (14) est guidée en ligne droite ou le long d'un chemin légèrement courbe à travers la zone d'exposition sur les deux faces.
  33. Section de séchage selon la revendication 31 ou 32, caractérisée en ce qu'au moins une bande de toile ou une bande d'appui (18, 42, 44) est guidée sur plusieurs rouleaux d'appui (38).
  34. Section de séchage selon la revendication 33, caractérisée en ce que les rouleaux d'appui (38) sont situés dans un plan ou dans une surface légèrement courbe.
  35. Section de séchage selon l'une quelconque des revendications 31 à 32, caractérisée en ce qu'au moins une bande de toile (18, 42, 44) est constituée de métal ou de matière plastique.
  36. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins un séchoir à flux par impact (16) dans une zone initiale de la section de séchage.
  37. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins un groupe de séchage avec au moins un cylindre de séchage (26) et en ce qu'au moins un séchoir à flux par impact (16) est disposé de préférence avant ce groupe de séchage dans le sens de défilement de la bande, la bande de matière présentant de préférence déjà, en atteignant le premier cylindre de séchage (26), une siccité. qui est plus élevée qu'environ 55 à environ 70 %.
  38. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins un groupe de séchage à une ligne et/ou au moins un groupe de séchage à deux lignes.
  39. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins un séchoir à flux par impact (16) dans une zone finale de la section de séchage (12).
  40. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins un séchoir à flux par impact (16) dans une zone d'évaporation principale de la section de séchage (12).
  41. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins deux séchoirs à flux par impact (16) situés l'un après l'autre dans le sens de défilement de la bande (L), par lesquels la bande de matière (14) peut être exposée par des côtés opposés à un flux par impact d'air chaud respectivement de vapeur chaude.
  42. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins deux séchoirs à flux par impact (16) situés l'un après l'autre dans le sens de défilement de la bande (L), par lesquels la bande de matière (14) peut être exposée par un même côté à un flux par impact d'air chaud respectivement de vapeur chaude.
  43. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu, en plus d'au moins un séchoir à flux par impact (16) frappant la bande de matière d'un seul côté, au moins deux séchoirs à flux par impact (16', 16") placés l'un en face de l'autre et frappant la bande de matière (14) sur les deux côtés.
  44. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu, entre deux séchoirs à flux par impact (16) situés l'un après l'autre dans le sens de défilement de la bande, frappant la bande de matière (14) sur un même côté avec un flux par impact d'air chaud respectivement de vapeur chaude, au moins un autre séchoir à flux par impact (16', 16", 16' ") pour exposer la bande de matière (14) par le côté opposé ou par les deux côtés à un flux par impact d'air chaud respectivement de vapeur chaude.
  45. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu, entre deux séchoirs à flux par impact (16) situés l'un après l'autre dans le sens de défilement de la bande (L), frappant la bande de matière (14) par des côtés opposés avec un flux par impact d'air chaud respectivement de vapeur chaude, au moins une paire de séchoirs à flux par impact (16', 16") situés l'un en face de l'autre, pour exposer la bande de matière sur les deux côtés à un flux par impact d'air chaud respectivement de vapeur chaude.
  46. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu au moins un groupe de trois unités de séchoirs à flux par impact situées l'une après l'autre, composées chaque fois d'un séchoir ou de deux séchoirs à flux par impact situés l'un en face de l'autre (16 ; 16'" ; 16', 16"), dans la région desquelles la bande de matière (14) est guidée d'abord le long d'un arc de cercle, ensuite dans un plan ou dans une surface légèrement courbe et ensuite à nouveau le long d'un arc de cercle.
  47. Section de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce qu'il est prévu plusieurs séchoirs à flux par impact (16) situés l'un après l'autre dans le sens de défilement de la bande (L) et la bande de matière (14) est exposée en alternance sur les côtés opposés à ces séchoirs à flux par impact (16).
EP99112926A 1998-09-11 1999-07-05 Section de séchage Expired - Lifetime EP0989232B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19841768 1998-09-11
DE19841768A DE19841768A1 (de) 1998-09-11 1998-09-11 Trockenpartie

Publications (3)

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EP0989232A2 EP0989232A2 (fr) 2000-03-29
EP0989232A3 EP0989232A3 (fr) 2001-01-10
EP0989232B1 true EP0989232B1 (fr) 2004-04-28

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EP (1) EP0989232B1 (fr)
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Publication number Publication date
DE19841768A1 (de) 2000-03-16
EP0989232A2 (fr) 2000-03-29
EP0989232A3 (fr) 2001-01-10
US6294050B1 (en) 2001-09-25
DE59909306D1 (de) 2004-06-03

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