EP1088594B1 - Procédé et dispositif de pulvérisation d'un produit sur une nappe fibreuse en défilement - Google Patents

Procédé et dispositif de pulvérisation d'un produit sur une nappe fibreuse en défilement Download PDF

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Publication number
EP1088594B1
EP1088594B1 EP00116349A EP00116349A EP1088594B1 EP 1088594 B1 EP1088594 B1 EP 1088594B1 EP 00116349 A EP00116349 A EP 00116349A EP 00116349 A EP00116349 A EP 00116349A EP 1088594 B1 EP1088594 B1 EP 1088594B1
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EP
European Patent Office
Prior art keywords
nozzle
pulsation
spraying
valve
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
EP00116349A
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German (de)
English (en)
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EP1088594A3 (fr
EP1088594A2 (fr
Inventor
Robert Wolf
Markus Oechsle
Frank Wegehaupt
Lothar Bendig
Klaus Landvatter
Reinhold Gaa
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication date
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Publication of EP1088594A3 publication Critical patent/EP1088594A3/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/50—Spraying or projecting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators

Definitions

  • the invention relates to a method and a device for spraying a moving fibrous web, in particular paper or board web, by means of at least a nozzle, wherein the nozzle is a preferably adjustable volume flow the relevant spray medium is supplied.
  • Spray systems are used to target specific web properties to influence. These properties may include, for example the moisture content, the surface moisture, the surface coating and / or the like. Alternatively or additionally is also a Vaccination with additives conceivable.
  • a Variable volume flow is sprayed (see, for example, the moisture cross-profiling with nozzle humidifiers in papermaking), are currently coming the following two control concepts are used:
  • valves with binary flow control be multiple valves with different Flow rate as a valve block connected in parallel.
  • each Valve only knows the condition open or closed.
  • This control concept has the disadvantage that the addition can only generate a stepped volume flow characteristic.
  • Another Disadvantage is the large number of individual valves per nozzle and thereby conditional large space requirement and high price of the valve block.
  • This control concept has the disadvantage that the addition can only generate a stepped volume flow characteristic.
  • Another Disadvantage is the large number of individual valves and nozzles and thereby conditional high price of the total spray unit.
  • Proportional valves come with the current state of the art small volume flows hardly used because the control range too small and the clogging sensitivity is too high. In addition, these valves very expensive.
  • the aim of the invention is a method according to claim 1 and an apparatus according to claim 14 of the beginning to create said type, in which the aforementioned disadvantages are eliminated.
  • this object is achieved according to the invention solved that the Sprühmedium volume flow of the nozzle over at least a pulsation valve is supplied, wherein the volume flow of the spray medium occurring pulsations preferably attenuated or attenuated become.
  • the volume flow supplied to the nozzle is preferably adjusted via the pulsation valve.
  • the pulsation valves are preferably used in paper and board machines, especially in nozzle moisteners, coating units, starch spray systems, Profiling systems etc. used. Basically, a Use for volume flow control of liquids in nozzles during spraying fiber-containing moving webs, especially in sprayers in paper and board machines, in particular in jet dampers, Coating units, starch testing equipment, profiling equipment etc. possible.
  • a pulsation valve is preferably an anchor valve and in particular a plate anchor valve used.
  • Pulsating valves as such are already in the documents DE 41 396 71 C2 and DE 44 194 46 C2.
  • Pulsation dampers or pulse dampers use the compressibility of Gases to compensate for pressure fluctuations.
  • the arrangement of the supply line and the output line in one compared to the line cross section this allows much larger closed gas volume Infuse the liquid until both cross sections (inlet and Exit) into the liquid.
  • the remaining gas volume is enclosed and compressed according to the applied pressure.
  • the gas pre-charge pressure is adapted to the operating pressure. Rapid pressure fluctuations (pulsations) change this Volume of caged gas (predominantly air).
  • the energy-transforming Compression and expansion of the gas cushion smoothes the incoming Pulsations.
  • the flexible nozzle lead can, for example, by a polyethylene.
  • Polyurethane or polyamide be formed.
  • she may for example have a length, in particular greater than 3 m and preferably greater than 5 m.
  • An appropriate arrangement will preferably in paper and board machines, in particular in nozzle moisteners, Coating units, starch spraying plants, profiling plants etc. used.
  • a nozzle is used whose in the web running direction measured spray width at least 30%, and preferably at least 50 % of the spray width measured in the web transverse direction.
  • the nozzle is a flat jet nozzle is used.
  • an elliptical flat jet nozzle be used.
  • Such flat jet nozzles in particular in combination with the used Pulsationsdämpfern and / or flexible nozzle feeders which provide sufficient attenuation of the pulsations.
  • Flat jet nozzles have the property that all rays under approximately the same angle in the web running direction on the fibrous web incident. The efficiency of dampening depends on this angle from. This has the advantage that the optimum angle for a maximum Moisture efficiency can be adjusted.
  • the nozzle is a Flat fan nozzle used at an angle of attack to the fibrous web sprays against the web running direction, the angle of attack in particular less than about 80 ° and preferably less than about 70 ° can.
  • the efficiency of the moisture is increased accordingly or a mists reduced.
  • a corresponding flat jet nozzle can advantageously is used at web speeds greater than in particular 1200 m / min and preferably greater than 1500 m / min.
  • a corresponding arrangement is preferably used in paper and board machines, especially in nozzle moisteners, coating units, starch spray systems, Profiling systems etc. used.
  • a nozzle as a Full cone nozzle is used.
  • the volume flow supplied via such a pulsation valve advantageously becomes be set via a pulse width modulation.
  • the pulsation valve is preferably driven at a constant clock frequency.
  • the specified method is advantageously used in paper or board machines and in particular in nozzle moisteners, coating units, retinasprühanlagen, profiling and / or the like applied.
  • the device according to the invention is accordingly characterized that the spray medium volume flow of the nozzle via at least a pulsation valve is supplied, wherein preferably means provided are pulsations occurring in the volume flow of the spray medium to dampen or mitigate.
  • Pulsation valves in particular anchor valves and preferably plate anchor valves especially for use in paper and paper Cardboard machines with pulsation dampers and / or flexible supply lines be combined.
  • a unit of a pulsation valve and a pulsation damper and / or an elastic nozzle feed line be formed.
  • Pulsation valves in particular anchor valves and preferably plate anchor valves can except with pulsation dampers and / or flexible Supply lines also combined with the respective remplisstiksssprühdüse become.
  • Such combinations are applicable again in installations for spraying moving fibrous webs, in particular in sprayers in paper and board machines and in particular in nozzle moisteners, coating units, starch spray systems, profiling plants and / or the like. It can thus be a single unit from a pulsation valve, a pulsation damper and / or a flexible Feed line and a nozzle are formed.
  • An advantage of such a unit of pulsation damper and / or more flexible Supply line, valve and nozzle is that a pulsating valve, due to the pulsation damping, also for spraying moving railways can be used.
  • Pulsation valves in particular anchor valves and preferably plate anchor valves for spraying moving fibrous webs for use especially in spraying equipment for paper and board machines, especially in nozzle moisteners, coating units, starch spray systems, Profiling systems and / or the like, in particular can also be used in combination with nozzles whose spray width is large in the web running direction, in particular greater than 30 % of the spray width in the web transverse direction, in particular elliptical Flat jet nozzles or full cone nozzles are usable. It can thus in particular also a respective unit of a pulsating valve and a nozzle with a large spray width are formed.
  • Pulsating valves such as in particular anchor valves and preferably plate anchor valves can also be used in combination with at least one pulsation damper and / or a flexible supply line and in combination with Nozzles are used whose spray width is large in the web running direction and in particular greater than 30% and preferably greater than 50 % of the spray width in the web transverse direction, in particular elliptical Flat jet nozzles or full cone nozzles for spraying moving fibrous webs can be used. It is especially one again Use in spraying equipment in paper and board machines, especially in nozzle moisteners, coating units, starch spray systems, Profiling systems and / or the like, possible.
  • a respective pulsating Valve can thus in particular also in combination with a Pulsation damper and a nozzle with a large spray width can be used.
  • the volume flow at a nozzle or a nozzle group regulate and for spraying moving fibrous webs in particular can be used in spraying machines for paper and board machines in particular also a use in nozzle dampers, Coating units, starch spraying plants, profiling plants and / or the like is possible.
  • Pulsation valves in themselves generate a pulsating volume flow, the when spraying moving webs are transferred to the spray pattern can.
  • the applied spray amount would thus in the direction of the Vary track according to the pulsation.
  • the extent of the Variation of the spray rate on the following factors: Frequency of the Pulsation, web speed, spray width in web direction, number the nozzles in the web running direction and damping the pulsation.
  • any volumetric flows can be set, which may be e.g. a more precise response function for moisture profiling with nozzle moisteners allowed.
  • Due to the damper system according to the invention is a pulationsarmes Spraying possible. This is done, for example, by reducing fluid fluctuations after the pulsation valve in particular at least 50%, in particular at least 80% and in particular at least 90% just before the nozzle reached. This will be pulsations in the spray liquid caused by vibrating machine parts such as a pump or a pulsating valve were created, damped, whereby the uniformity of the spray pattern in the web running direction is improved.
  • valves per nozzle especially with just one valve per nozzle, can be compared to the prior art, especially in sprayers for paper and board machines smaller dimensions for the Control unit can be achieved, which may allow the valve directly in to integrate the spray bar.
  • Valves Due to the smaller number of valves compared to the prior art and / or nozzles, in particular with only one valve per nozzle or only a nozzle per spray position in the web transverse direction, and / or less expensive Valves can be used in particular in spraying systems in paper and board machines lower maintenance and cheaper sprayers getting produced.
  • liquids especially water, Starch, vaccines, (paints and varnishes) conceivable.
  • the volume flows per nozzle and / or valve, for example, in a Range up to a maximum of 30 l / min, in particular up to a maximum of 0.70 l / min and preferably up to a maximum of 0.20 l / min.
  • the device according to the invention is also characterized by a relative high durability. For example, use is extensive Continuous operation with over 70% operating time, especially with over 90% Operating life with a life of at least 3 years, in particular at least 5 years imaginable.
  • the invention is particularly also at pressures of less than 20 bar, in particular less than 2 bar and preferably less than 1 bar applicable.
  • nozzles can also be used in particular different types of nozzles become. These include, in particular, single-substance nozzles, two-component nozzles (Liquid-gas, liquid-liquid), mixing inside or outside, different beam shapes, in particular flat jet nozzles and in particular Full cone nozzles.
  • flow rates in the ratio of less than 1: 5, in particular smaller than 1:10 and in particular smaller than 1:15 conceivable.
  • FIG. 1 shows a diagrammatic partial representation of a possible embodiment a device 10 for spraying a moving fibrous web 12.
  • the fibrous web 12 may be in particular to act a paper or board web.
  • the device 10 comprises at least one nozzle 14, which is a preferably adjustable volume flow of the respective spray medium 16 supplied becomes.
  • the nozzle 14 is preceded by at least one pulsation damper 18, to the volume flow of the spray medium 16 contained pulsations dampen.
  • the volume flow of the spray medium 16 is through a pulsation valve 20 set.
  • This may, for example, an anchor valve and in particular to act a plate anchor valve.
  • This pulsation valve 20 is driven via a control voltage U with a clock frequency f.
  • the volume flow for example via a pulse width modulation be varied.
  • the clock frequency f is preferred in this case kept constant.
  • the pulsation valve 20 is the Spray medium 16 is supplied via a line 22.
  • the pulsation damper 18 is in a line connecting the pulsation valve 20 to the nozzle 14 24 arranged. He is thus between the pulsation valve 20 and the nozzle 14.
  • FIG. 2 shows a functional diagram for explaining the mode of operation of the pulsation valve 20.
  • the duration T opens and closes the pulsation once the Flow, or it remains open continuously or closed throughout.
  • the duration of the opening interval to can be varied.
  • the Ratio to / T determines the opening duration of the pulsation valve. ever the longer the opening duration, the more liquid flows through the pulsation valve. Accordingly, the volume flow of the liquid can be regulated become.
  • the first time diagram results with an opening duration of 50%, the second with an opening duration of 25% and the third with one Opening period of 75%.
  • FIG. 3 shows an example of a characteristic curve a of a pulsation valve continuous flow control compared to a corresponding Characteristic b of a proportional valve.
  • pulsation damper 18 The unit shown in Figure 1 from pulsation valve 20, pulsation damper 18 and nozzle 14 is particularly in plants for spraying moving fibrous webs 12, in particular in spraying at Paper and board machines, in particular in steam dampers, Coating units, starch spraying installations, profiling installations and / or can be used.
  • the pulsation damper 18 By the pulsation damper 18 is achieved the pulsations contained in the spray medium 16, as in particular are generated by a pulsation valve 20 are attenuated.
  • a pulsation damper instead of a pulsation damper or in addition, for example also be provided a flexible supply to the nozzle.
  • a pulsating valve 20 in combination with a nozzle large spray width measured in the web running direction L. or depth.
  • a unit made Pulsation valve and nozzle measured in the direction of web travel Spray width or even a unit of pulsation valve, pulsation damper (and / or flexible supply) and nozzle large in the web running direction be provided measured spray width.
  • FIG. 4 shows the spray pattern A of such a nozzle 14 with a large spray width b 1 measured in the web running direction L , here for example a full cone nozzle, in comparison to the spray pattern B of a flat jet nozzle.
  • the parts A and B of Figure 4 show the spray pattern of the respective nozzle at the times t 1 , t 2 and t 3 .
  • the displacement of the respective spray pattern corresponds to the moving web.
  • the shaded area of the respective spray pattern means that at this time the nozzle does not spray or only slightly.
  • the nozzle sprays in the non-hatched area of the respective spray pattern. It is thus reproduced the time course of the pulsation.
  • the spray pattern A results in a full cone nozzle with large in the web running direction measured spray width bi.
  • the points P1 and P2 become from a spraying picture with spraying and a spraying picture without spraying overlaps. This leads despite a in the flow of the spray medium contained pulsation to a uniform spray pattern in the points P1 and P2 (see the right part of Figure 4A).
  • the spray pattern B results in a flat jet nozzle with small measured in the web running direction L spray width b l .
  • the points P1 and P2 are each overlapped only by a spraying image with a spray or a spray image without spraying. As a result, the pulsation contained in the volume flow of the spray medium is transferred completely to the spray pattern of the web 12 (compare the right-hand part of FIG.
  • a nozzle with a large spray width b 1 measured in the web running direction it is also possible, for example, to use an elliptical flat-jet nozzle instead of a full-cone nozzle.
  • a pulsation in the spray pattern contained in the volume flow is attenuated by a large measured in the web running direction spray width b l , which is due to the fact that the moistening of a particular point on the moving web through the large spray width over a longer period. This compensates for volumetric flow fluctuations during this period at the point in question.
  • the spray width b 1 of the respective nozzle measured in the web running direction can be, for example, greater than 30% of the spray width b q measured in the web transverse direction.
  • the nozzle 14 can be, for example, a nozzle Flat jet nozzle can be used, the ⁇ at an angle of attack Fiber web 12 against the web running direction L sprays.
  • the corresponding beam direction is denoted by SR.
  • the angle of attack In particular, ⁇ may be less than about 80 °, and preferably less than be about 70 °.
  • both units can be used as a pulsation valve, for example Anchor valve such as in particular a plate anchor valve can be used. Both units are for example usable for spraying more agitated Fibrous webs, especially in spraying in paper and Board machines, in particular in nozzle moisteners, coating units, Gilsprühanlagen, profiling and / or the like.
  • Anchor valve such as in particular a plate anchor valve
  • Both units are for example usable for spraying more agitated Fibrous webs, especially in spraying in paper and Board machines, in particular in nozzle moisteners, coating units, Starsprühanlagen, profiling and / or the like.
  • Spray width bi for example, an elliptical flat-jet nozzle or a Full cone nozzle be provided.

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Claims (29)

  1. Procédé pour pulvériser un produit sur une nappe fibreuse en défilement (12), notamment une nappe de papier ou de carton, au moyen d'au moins une buse (14), dans lequel la buse (14) est alimentée en un courant volumique de préférence ajustable du fluide à pulvériser en question (16),
    caractérisé en ce que
    le courant volumique de fluide à pulvériser est envoyé à la buse (14) par le biais d'au moins une vanne à pulsations (20), les pulsations se produisant dans le courant volumique du fluide à pulvériser (16) étant amorties ou affaiblies.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le courant volumique envoyé à la buse (14) est ajusté par le biais de la vanne à pulsations (20).
  3. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on utilise comme vanne à pulsations (20) une vanne à armature.
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    l'on utilise comme vanne à pulsations (20) une vanne à armatures à plaques.
  5. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les pulsations se produisant dans le courant volumique du fluide à pulvériser (16) sont amorties ou affaiblies au moyen d'au moins un amortisseur de pulsations (18) monté en aval de la buse (14) et/ou par l'utilisation d'une buse (14) ayant une largeur de pulvérisation (bl) de taille correspondante mesurée dans la direction d'avance de la nappe (L) et/ou par l'utilisation d'une conduite d'amenée flexible (24') à la buse (14).
  6. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on utilise une buse (14) dont la largeur de pulvérisation (bl) mesurée dans la direction d'avance de la nappe (L) vaut au moins 30% et de préférence au moins 50% de la largeur de pulvérisation (bq) mesurée dans la direction transversale de la nappe.
  7. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on utilise comme buse (14) une buse à jet plat de préférence elliptique.
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on utilise comme buse (14) une buse à jet plat qui pulvérise un produit suivant un angle d'attaque (α) par rapport à la nappe fibreuse (12) dans le sens opposé à la direction d'avance de la nappe (L), l'angle d'attaque (α) étant notamment inférieur à environ 80° et de préférence inférieur à environ 70°.
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    l'on utilise une buse à jet plat correspondante pour des vitesses de la nappe qui sont supérieures à environ 1200 m/min et de préférence supérieures à 1500 m/min.
  10. Procédé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    l'on utilise comme buse (14) une buse en cône plein.
  11. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le courant volumique amené par le biais de la vanne à pulsations (20) est ajusté par le biais d'une modulation de largeur d'impulsion.
  12. Procédé selon la revendication 11,
    caractérisé en ce que
    la vanne à pulsations (20) est commandée avec une fréquence d'horloge constante.
  13. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'il
    est utilisé dans des machines de papier ou de carton et notamment dans des humidificateurs à buses, des unités d'enduction, des installations de pulvérisation d'amidon, des installations de profilage et/ou similaires.
  14. Dispositif (10) pour pulvériser un produit sur une nappe fibreuse en défilement (12), notamment une nappe de papier ou de carton, au moyen d'au moins une buse (14), la buse pouvant être alimentée en un courant volumique de préférence ajustable du fluide à pulvériser en question (16), notamment pour mettre en oeuvre le procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le courant volumique de fluide à pulvériser est envoyé à la buse (14) par le biais d'au moins une vanne à pulsations (20), afin d'amortir ou d'affaiblir les pulsations se produisant dans le courant volumique du fluide à pulvériser (16).
  15. Dispositif selon la revendication 14,
    caractérisé en ce que
    le courant volumique envoyé à la buse (14) peut être ajusté par le biais de la vanne à pulsations (20).
  16. Dispositif selon la revendication 14 ou 15,
    caractérisé en ce que
    l'on prévoit comme vanne à pulsations (20) une vanne à armature.
  17. Dispositif selon la revendication 16,
    caractérisé en ce que
    l'on prévoit comme vanne à pulsations (20) une vanne à armatures à plaques.
  18. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    au moins un amortisseur de pulsations (18) est monté en aval de la buse (14) et/ou la buse (14) possède une largeur de pulvérisation (bl) de taille correspondante mesurée dans la direction d'avance de la nappe (L) et/ou l'on prévoit une conduite d'amenée flexible (24') à la buse (14), afin d'amortir ou d'affaiblir les pulsations se produisant dans le courant volumique du fluide à pulvériser (16).
  19. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on prévoit une buse (14) dont la largeur de pulvérisation (bl) mesurée dans la direction d'avance de la nappe (L) vaut au moins 30% et de préférence au moins 50% de la largeur de pulvérisation (bq) mesurée dans la direction transversale de la nappe.
  20. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on prévoit comme buse (14) une buse à jet plat de préférence elliptique.
  21. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on prévoit comme buse (14) une buse à jet plat qui pulvérise un produit suivant un angle d'attaque (α) par rapport à la nappe fibreuse (12) dans le sens opposé à la direction d'avance de la nappe (L), l'angle d'attaque (α) étant notamment inférieur à environ 80° et de préférence inférieur à environ 70°.
  22. Dispositif selon l'une quelconque des revendications 1 à 19,
    caractérisé en ce que
    l'on prévoit comme buse (14) une buse en cône plein.
  23. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le courant volumique amené par le biais de la vanne à pulsations (20) peut être ajusté par le biais d'une modulation de largeur d'impulsion.
  24. Dispositif selon la revendication 23,
    caractérisé en ce que
    la vanne à pulsations (20) peut être commandée avec une fréquence d'horloge constante.
  25. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la conduite d'amenée flexible (24') à la buse (14) est formée par un tuyau souple en polyéthylène, en polyuréthanne ou en polyamide.
  26. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la conduite d'amenée flexible (24') à la buse (14) possède une longueur qui est notamment supérieure à 3 m et de préférence supérieure à 5 m.
  27. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on prévoit une unité se composant d'une vanne à pulsations (20) et d'un amortisseur de pulsations (18).
  28. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'on prévoit une unité se composant d'une vanne à pulsations (20), d'un amortisseur de pulsations (18) et/ou d'une conduite d'amenée flexible (24') et d'une buse (14).
  29. Utilisation du dispositif selon l'une quelconque des revendications précédentes dans des machines à papier ou à carton et notamment dans des humidificateurs à buses, des unités d'enduction, des installations de pulvérisation d'amidon, des installations de profilage et/ou similaires.
EP00116349A 1999-09-28 2000-07-28 Procédé et dispositif de pulvérisation d'un produit sur une nappe fibreuse en défilement Expired - Lifetime EP1088594B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19946479A DE19946479A1 (de) 1999-09-28 1999-09-28 Verfahren und Vorrichtung zum Besprühen einer bewegten Faserstoffbahn
DE19946479 1999-09-28

Publications (3)

Publication Number Publication Date
EP1088594A2 EP1088594A2 (fr) 2001-04-04
EP1088594A3 EP1088594A3 (fr) 2003-08-27
EP1088594B1 true EP1088594B1 (fr) 2005-03-23

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EP00116349A Expired - Lifetime EP1088594B1 (fr) 1999-09-28 2000-07-28 Procédé et dispositif de pulvérisation d'un produit sur une nappe fibreuse en défilement

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Country Link
US (1) US6444090B1 (fr)
EP (1) EP1088594B1 (fr)
DE (2) DE19946479A1 (fr)

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EP1366825B1 (fr) * 2002-05-28 2018-01-24 The Procter & Gamble Company Procédé et appareil de formation d'un flux pulsé de particules
EP1366824A1 (fr) * 2002-05-28 2003-12-03 The Procter & Gamble Company Procédé et appareil de formation d'un flux pulsé de particules
DE10359112A1 (de) * 2003-12-17 2005-07-21 Voith Paper Patent Gmbh Verfahren zur Reinigung einer Düse für die Oberflächenbehandlung einer Materialbahn, sowie Vorrichtung zur Durchführung des Verfahrens
US20090107398A1 (en) * 2007-10-31 2009-04-30 Nordson Corporation Fluid dispensers and methods for dispensing viscous fluids with improved edge definition
DE102008037247A1 (de) 2008-08-09 2010-02-11 Dürr Ecoclean GmbH Vorrichtung und Verfahren zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids
US8253049B2 (en) * 2008-09-22 2012-08-28 Anthony Grisby Decorative light switch cover
DE102009027858A1 (de) * 2009-07-21 2011-01-27 Robert Bosch Gmbh Dosiervorrichtung mit Schaltventil
US9884330B2 (en) 2014-06-20 2018-02-06 Deere & Company Broadband spray nozzle systems and methods
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Publication number Priority date Publication date Assignee Title
DE102020129160A1 (de) 2020-11-05 2022-05-05 Voith Patent Gmbh Vorrichtung und Verfahren zum Befeuchten einer Materialbahn
WO2022096266A1 (fr) 2020-11-05 2022-05-12 Voith Patent Gmbh Dispositif et procédé d'humectage d'une bande de matériau

Also Published As

Publication number Publication date
EP1088594A3 (fr) 2003-08-27
DE19946479A1 (de) 2001-03-29
US6444090B1 (en) 2002-09-03
DE50009846D1 (de) 2005-04-28
EP1088594A2 (fr) 2001-04-04

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