EP0632243B1 - Apparatus for drying strips, in particular paper strips - Google Patents
Apparatus for drying strips, in particular paper strips Download PDFInfo
- Publication number
- EP0632243B1 EP0632243B1 EP94401368A EP94401368A EP0632243B1 EP 0632243 B1 EP0632243 B1 EP 0632243B1 EP 94401368 A EP94401368 A EP 94401368A EP 94401368 A EP94401368 A EP 94401368A EP 0632243 B1 EP0632243 B1 EP 0632243B1
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- European Patent Office
- Prior art keywords
- drying
- nozzles
- neutralized
- plane
- strip form
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- 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.)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
- F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
Definitions
- the present invention relates to a device for drying a strip material, in particular strip paper, comprising on a frame two series of drying nozzles, delimiting in a plane a corridor for the passage of strip material on a path, each of the series of drying nozzles being located in a plane substantially parallel to said plane, the drying nozzles being perpendicular to the material path, each nozzle comprising at least one narrow longitudinal slot capable of let a drying gas flow, for example air, said longitudinal slit being delimited by space between two internal and external longitudinal sheets substantially parallel attached to the nozzle by means known, means of obstruction being provided for selectively neutralize a plurality of zones of at least a slit.
- FR-A-2 284 844 and FR-A-1 551 270 describe drying devices of this type, the nozzles of which include a slot provided with zones neutralized by covers U-shaped sheet metal or by a slot shutter.
- the covers and the slotted shutter are parts whose production and installation are costly in material and labor.
- the present invention avoids these drawbacks by proposing a drying device having the structure indicated in the first paragraph above, this drying being characterized in that the neutralized areas are formed by a local stamping plate plate external against the internal sheet, the space between two neutralized zones constituting a window through which the drying gas flows out.
- This local stamping constitutes an effective means for permanently carry out neutralized zones. It has the advantage to be economical because it does not require the manufacture of lids or a slotted shutter and is extremely efficient for standardized productions.
- the neutralized zones are evenly distributed along the longitudinal slits narrow nozzles.
- This effect is particularly noticeable on the one hand near a nozzle but also in the space between two nozzles.
- the present invention makes it possible to create a turbulent air flow and multidirectional air jets, this which improves the drying of the paper thanks to an increase in the Thermal transfer.
- each of the nozzles of the drying includes two narrow longitudinal slots
- the neutralized areas of the two slots are preferably offset.
- the neutralized zones of the two slots a nozzle are arranged in staggered rows.
- the ratio between the constant width L n of the neutralized zones of a slit and the constant width L f of the windows of this slit has a value of 0.3 to 0.7.
- Figure 1 shows in broken lines a device for drying a strip of paper 1, having the general shape of a frame elongated 2 of several meters in length, of width about 1.5 m, including an entrance and a output for paper.
- This one driven by means not shown, flows in a plane P inside the dryer.
- first and a second series S 1 , S 2 of drying nozzles 3 are arranged in the frame.
- first series S 1 being situated in a plane P 1 parallel to the plane of circulation of the paper and above it
- second series S 2 being located in a plane P 2 parallel to the plane of circulation of the paper and below it.
- the drying nozzle series delimit a corridor for the passage of the paper in strip on a trajectory T located in plane P.
- the drying nozzles are connected to air blowers not shown and have the function of projecting a flow air 5, to dry the paper.
- the drying nozzles which can also be seen in detail in the Figure 2, have an elongated structure of 1.30 m length and are arranged perpendicular to the paper path.
- the nozzles located in the upper plane P 1 are not placed opposite the nozzles located in the lower plane P 2 .
- the nozzles of the two series are therefore offset from one another and more precisely staggered; it follows that the strip of paper alternately receives air from a nozzle located in the upper plane and then air from a nozzle located in the lower plane.
- FIG. 2 partially represents two nozzles A and B of the prior art and a nozzle C corresponding to an embodiment of the present invention, in the plane P 2 .
- Each nozzle A, B or C has two longitudinal sheets external 11, right and left, fixed to the frame, inside which are placed air supply lines.
- an internal sheet 12 is fixed in the shape of an inverted U, the dimensions of the internal sheet being less than the distance which separates the right side sheets and left, to determine the location of the slots for the drying air.
- the end of the right and left external sheets lies substantially in the same plane as the base of the internal sheet in the shape of an inverted U.
- the air flow which escapes from the nozzle A of the prior art is perpendicular to the strip of paper.
- the pressure exerted locally on the width of the paper strip tends to push it up for the nozzles of the S 2 series and down for the others; this produces a ripple of the paper, sometimes upwards, sometimes downwards.
- a leakage rate parallel to the nozzle and to the plane of the paper causes a flag effect on the edge of the paper, or vibrations from bottom to top.
- the drying nozzle B has the same structure, but a metal comb 7 has been slipped and screwed inside each slot 4 comprising a thin base 8 placed inside the slot and teeth 9 flush with the surface of each slot in the plane P 2 , teeth between which there are slots 10 which allow the air flow to pass; in fact, the narrowness of the base is such that it does not prevent the passage of air.
- the width of a tooth L d is about 24 mm and the width of a tooth L c about 32 mm; thus, the ratio L d / L c is equal to 0.75.
- the presence of the teeth constitutes neutralized zones 6 which modify the direction of the air leaving the slit: the air flow thwarted by obstacles comb teeth is emitted in all directions, too right up, right and left, front and the rear; this multidirectional air flow achieves a better drying of the paper, and we can maintain a strong air pressure since its effects are distributed; on the other hand, thanks to the decrease in the pressure of the air cushion and this air flow multidirectional, the leak rate on the edges of the paper is greatly reduced and the effects are no longer encountered "flag" in the vicinity of the edges of the strip.
- Nozzle C has the same structure as the nozzle of art previous A but we note that the right and outer plates left were stamped locally, the external sheet coming from thus in contact with the internal sheet, to constitute neutralized zones distributed along the nozzle; space located between two neutralized zones is a window 13; the external and internal sheets are preferably glued or soldered to the contact locations.
- the width L n of the neutralized zones is approximately 50 mm and that L f of the windows is approximately 20 mm; the ratio L n / L f is equal to 2.5.
- Figure 3 shows top views of several possible arrangements of neutralized zones for nozzles a dryer.
- Line a shows a slit whose neutralized areas (L d , L n ) are 20 mm wide and whose slots or windows (L c , L f ) are 40 mm wide; the ratio L d / L c or L n / L f is equal to 0.5.
- L d equals L n equals 3 mm
- L c equals L f equals 30 mm
- L d / L c equals L n / L f equals 0.1
- L d equals L n equals 40 mm and L c equals L f equals 4 mm, so L d / L c equals L n / L f equals 10.
Abstract
Description
La présente invention concerne un dispositif pour le séchage d'un matériau en bande, notamment de papier en bande, comprenant sur un bâti deux séries de buses de séchage, délimitant dans un plan un couloir pour le passage du matériau en bande sur une trajectoire, chacune des séries de buses de séchage étant située dans un plan sensiblement parallèle audit plan, les buses de séchage étant perpendiculaires à la trajectoire du matériau, chaque buse comportant au moins une fente longitudinale étroite apte à laisser s'écouler un gaz de séchage, par exemple de l'air, ladite fente longitudinale étant délimitée par l'espace compris entre deux tôles longitudinales interne et externe sensiblement parallèles fixées à la buse par des moyens connus, des moyens d'obstruction étant prévus pour neutraliser sélectivement une pluralité de zones d'au moins une fente.The present invention relates to a device for drying a strip material, in particular strip paper, comprising on a frame two series of drying nozzles, delimiting in a plane a corridor for the passage of strip material on a path, each of the series of drying nozzles being located in a plane substantially parallel to said plane, the drying nozzles being perpendicular to the material path, each nozzle comprising at least one narrow longitudinal slot capable of let a drying gas flow, for example air, said longitudinal slit being delimited by space between two internal and external longitudinal sheets substantially parallel attached to the nozzle by means known, means of obstruction being provided for selectively neutralize a plurality of zones of at least a slit.
FR-A-2 284 844 et FR-A-1 551 270 décrivent des dispositifs de séchage de ce type, dont les buses comportent une fente pourvue de zones neutralisées par des couvercles de tôle en U ou par un obturateur à créneaux.FR-A-2 284 844 and FR-A-1 551 270 describe drying devices of this type, the nozzles of which include a slot provided with zones neutralized by covers U-shaped sheet metal or by a slot shutter.
Les couvercles et l'obturateur à créneaux sont des pièces dont la réalisation et l'installation sont coûteuses en matière et en main d'oeuvre.The covers and the slotted shutter are parts whose production and installation are costly in material and labor.
La présente invention évite ces inconvénients en proposant un dispositif de séchage ayant la structure indiquée au premier paragraphe ci-dessus, ce dispositif de séchage étant caractérisé en ce que les zones neutralisées sont formées par un emboutissage local plaquant la tôle externe contre la tôle interne, l'espace situé entre deux zones neutralisées constituant une fenêtre par laquelle s'écoule le gaz de séchage.The present invention avoids these drawbacks by proposing a drying device having the structure indicated in the first paragraph above, this drying being characterized in that the neutralized areas are formed by a local stamping plate plate external against the internal sheet, the space between two neutralized zones constituting a window through which the drying gas flows out.
Cet emboutissage local constitue un moyen efficace pour réaliser à demeure les zones neutralisées. Il a l'avantage d'être économique car il ne nécessite pas la fabrication de couvercles ou d'un obturateur à créneaux et est extrêmement performant pour des productions normalisées.This local stamping constitutes an effective means for permanently carry out neutralized zones. It has the advantage to be economical because it does not require the manufacture of lids or a slotted shutter and is extremely efficient for standardized productions.
Il ne permet toutefois pas d'effectuer le réglage ou une modification du réglage de la dimension des zones neutralisées. However, it does not allow adjustment or a modification of the setting of the dimension of the zones neutralized.
Avantageusement, les zones neutralisées sont régulièrement réparties le long des fentes longitudinales étroites des buses.Advantageously, the neutralized zones are evenly distributed along the longitudinal slits narrow nozzles.
La présence de ces zones crée des turbulences dans le flux d'air qui s'échappe de la fente ou des fentes et qui devient ainsi multidirectionnel, ce qui augmente le transfert thermique et améliore le séchage.The presence of these zones creates turbulence in the air flow that escapes from the slit (s) and which thus becomes multidirectional, which increases the heat transfer and improves drying.
De plus, en diminuant la pression du coussin d'air, l'impact de l'air sur le papier est plus efficace et améliore encore le transfert thermique.In addition, by decreasing the pressure of the air cushion, the impact of air on paper is more efficient and improves still heat transfer.
Cet effet est particulièrement notable d'une part au voisinage d'une buse mais également dans l'espace situé entre deux buses.This effect is particularly noticeable on the one hand near a nozzle but also in the space between two nozzles.
Par ailleurs, la fuite d'air latérale est diminuée, ce qui permet de supprimer les effets de claquement ou "de drapeau" aux bords du papier, et d'éviter ainsi les vibrations du papier.In addition, the lateral air leakage is reduced, which which removes the snapping effects or "of flag "at the edges of the paper, and thus avoid vibrations of the paper.
En conclusion, la présente invention permet de créer un flux d'air turbulent et des jets d'air multidirectionnels, ce qui améliore le séchage du papier grâce à une augmentation du transfert thermique.In conclusion, the present invention makes it possible to create a turbulent air flow and multidirectional air jets, this which improves the drying of the paper thanks to an increase in the Thermal transfer.
Lorsque chacune des buses du dispositif de séchage comprend deux fentes longitudinales étroites, les zones neutralisées des deux fentes sont de préférence décalées.When each of the nozzles of the drying includes two narrow longitudinal slots, the neutralized areas of the two slots are preferably offset.
Avantageusement, les zones neutralisées des deux fentes d'une buse sont disposées en quinconce. Advantageously, the neutralized zones of the two slots a nozzle are arranged in staggered rows.
On prévoit également que les zones neutralisées successives des fentes des buses de l'une ou l'autre ou des deux séries de buses soient décalées d'un pas donné.It is also expected that neutralized areas successive slots of the nozzles of one or the other or two sets of nozzles are offset by a given pitch.
Ces dispositions ont l'avantage d'améliorer encore les turbulences du flux d'air ainsi que les performances du séchage et d'éliminer tout risque de vibration aux bords du papier. These provisions have the advantage of further improving the air flow turbulence as well as drying performance and eliminate any risk of vibration at the edges of the paper.
Avantageusement, le rapport entre la largeur constante Ln des zones neutralisées d'une fente et la largeur constante Lf des fenêtres de cette fente a une valeur de 0,3 à 0,7.Advantageously, the ratio between the constant width L n of the neutralized zones of a slit and the constant width L f of the windows of this slit has a value of 0.3 to 0.7.
Par ailleurs, on peut aussi concevoir une installation telle que le pas de décalage entre les zones neutralisées successives des fentes des buses soit égal à (Ln+Lf)/n, n ayant une valeur de 2 à 5.Furthermore, it is also possible to design an installation such that the offset step between the successive neutralized zones of the slots of the nozzles is equal to (L n + L f ) / n, n having a value of 2 to 5.
Ces valeurs déterminent un excellent séchage de la bande de papier.These values determine a excellent drying of the paper strip.
Un mode de réalisation de la présente invention sera décrit ci-après à titre d'exemple non limitatif en référence aux dessins annexés dans lesquels :
- la figure 1 est une vue schématique en perspective d'un sécheur de papier en bande conforme à l'invention ;
- la figure 2 est une vue en perspective partielle de deux buses de séchage A et B de l'art antérieur et d'une buse C conforme à l'invention ; et
- la figure 3 représente schématiquement plusieurs vues de dessus correspondant à différentes variantes des positions respectives des zones neutralisées des fentes des buses adjacentes ou voisines.
- Figure 1 is a schematic perspective view of a strip paper dryer according to the invention;
- Figure 2 is a partial perspective view of two drying nozzles A and B of the prior art and a nozzle C according to the invention; and
- FIG. 3 schematically represents several top views corresponding to different variants of the respective positions of the neutralized zones of the slots of the adjacent or neighboring nozzles.
La figure 1 représente en traits mixtes un dispositif pour le séchage d'une bande de papier 1, ayant la forme générale d'un bâti allongé 2 d'une longueur de plusieurs mètres, d'une largeur d'environ 1,5 m, comportant notamment une entrée et une sortie pour le papier.Figure 1 shows in broken lines a device for drying a strip of paper 1, having the general shape of a frame elongated 2 of several meters in length, of width about 1.5 m, including an entrance and a output for paper.
Celui-ci, entraíné par des moyens non représentés, circule dans un plan P à l'intérieur du sécheur.This one, driven by means not shown, flows in a plane P inside the dryer.
Dans le bâti sont disposées une première et une seconde
séries S1,S2 de buses de séchage 3, la première série S1 étant
située dans un plan P1 parallèle au plan de circulation du
papier et au-dessus de celui-ci, la seconde série S2 étant
située dans un plan P2 parallèle au plan de circulation du
papier et au-dessous de celui-ci.In the frame are arranged a first and a second series S 1 , S 2 of drying
Les séries de buses de séchage délimitent un couloir pour le passage du papier en bande sur une trajectoire T située dans le plan P.The drying nozzle series delimit a corridor for the passage of the paper in strip on a trajectory T located in plane P.
Les buses de séchage sont reliées à des souffleries d'air
non représentées et ont pour fonction de projeter un flux
d'air 5, dans le but de sécher le papier.The drying nozzles are connected to air blowers
not shown and have the function of projecting a
Les buses de séchage, que l'on voit aussi en détail à la figure 2, présentent une structure allongée d'1,30 m de longueur et sont disposées perpendiculairement à la trajectoire du papier.The drying nozzles, which can also be seen in detail in the Figure 2, have an elongated structure of 1.30 m length and are arranged perpendicular to the paper path.
Les buses situées dans le plan supérieur P1 ne sont pas placées en face des buses situées dans le plan inférieur P2. Les buses des deux séries sont donc décalées les unes par rapport aux autres et plus précisément disposées en quinconce ; il en résulte que la bande de papier reçoit alternativement l'air d'une buse située dans le plan supérieur puis l'air d'une buse située dans le plan inférieur.The nozzles located in the upper plane P 1 are not placed opposite the nozzles located in the lower plane P 2 . The nozzles of the two series are therefore offset from one another and more precisely staggered; it follows that the strip of paper alternately receives air from a nozzle located in the upper plane and then air from a nozzle located in the lower plane.
La figure 2 représente partiellement deux buses A et B de l'art antérieur et une buse C correspondant à un mode de réalisation de la présente invention, dans le plan P2. FIG. 2 partially represents two nozzles A and B of the prior art and a nozzle C corresponding to an embodiment of the present invention, in the plane P 2 .
Chaque buse A, B ou C comporte deux tôles longitudinales externes 11, droite et gauche, fixées au bâti, à l'intérieur desquelles sont placées des conduites d'amenée d'air.Each nozzle A, B or C has two longitudinal sheets external 11, right and left, fixed to the frame, inside which are placed air supply lines.
Dans le plan P2 et dans la zone comprise entre
l'extrémité des tôles externes droite et gauche est fixée une
tôle interne 12 en forme de U renversé, les dimensions de la
tôle interne étant inférieures à la distance qui sépare les
tôles latérales droite et gauche, pour déterminer
l'emplacement des fentes prévues pour l'air de séchage.
L'extrémité des tôles externes droite et gauche se situe
sensiblement dans le même plan que la base de la tôle interne
en forme de U renversé.In the plane P 2 and in the zone between the end of the right and left external sheets, an
Pour faciliter la compréhension de l'invention, on n'a
pas représenté les moyens connus de fixation des tôles
externes droite et gauche au bâti, et de la tôle interne en
forme de U. En général, ces différentes pièces métalliques
sont reliées les unes aux autres par des entretoises soudées
ou vissées qui ne font pas obstacle au passage de l'air,
l'ensemble étant également soudé ou vissé sur le bâti ; cet
ensemble formant buse présente deux fentes latérales 4 gauche
et droite à travers lesquelles s'échappe le flux d'air
puissant qui sèche le papier circulant dans l'appareil.To facilitate understanding of the invention, we have not
not shown the known means for fixing the sheets
right and left external to the frame, and internal sheet in
U shape. In general, these different metal parts
are connected to each other by welded spacers
or screwed which do not obstruct the passage of air,
the assembly also being welded or screwed to the frame; this
nozzle assembly has two
Le flux d'air qui s'échappe de la buse A de l'art antérieur est perpendiculaire à la bande de papier. La pression qui s'exerce localement sur la largeur de la bande de papier a tendance à repousser celle-ci vers le haut pour les buses de la série S2 et vers le bas pour les autres ; ceci produit une ondulation du papier, tantôt vers le haut, tantôt vers le bas. Aux extrémités de la buse, un débit de fuite parallèle à la buse et au plan du papier provoque sur le bord du papier un effet de drapeau, ou vibrations de bas en haut.The air flow which escapes from the nozzle A of the prior art is perpendicular to the strip of paper. The pressure exerted locally on the width of the paper strip tends to push it up for the nozzles of the S 2 series and down for the others; this produces a ripple of the paper, sometimes upwards, sometimes downwards. At the ends of the nozzle, a leakage rate parallel to the nozzle and to the plane of the paper causes a flag effect on the edge of the paper, or vibrations from bottom to top.
La buse de séchage B
a la même structure,
mais on a glissé et vissé à l'intérieur de chaque fente 4 un
peigne métallique 7 comportant une embase mince 8 placée à
l'intérieur de la fente et des dents 9 affleurant à la
surface de chaque fente dans le plan P2, dents entre
lesquelles se trouvent des créneaux 10 qui laissent passer le
flux d'air ; en effet, l'étroitesse de l'embase est telle
qu'elle ne s'oppose pas au passage de l'air.The drying nozzle B has the same structure, but a
La largeur d'une dent Ld est d'environ 24 mm et la largeur d'un créneau Lc d'environ 32 mm ; ainsi, le rapport Ld/Lc est égal à 0,75.The width of a tooth L d is about 24 mm and the width of a tooth L c about 32 mm; thus, the ratio L d / L c is equal to 0.75.
Sur la buse B représentée, le peigne placé dans une des fentes a été décalé latéralement par rapport à celui placé dans l'autre fente de sorte qu'un créneau fait face à une dent et réciproquement.On nozzle B shown, the comb placed in one of the slots was laterally offset from that placed in the other slot so that a niche faces a tooth and vice versa.
La présence des dents constitue des zones neutralisés 6
qui modifient la direction de l'air en sortie de fente : le
flux d'air contrarié par les obstacles que constituent les
dents du peigne est émis dans toutes les directions, aussi
bien vers le haut, la droite et la gauche, l'avant et
l'arrière ; ce flux d'air multidirectionnel réalise un
meilleur séchage du papier, et on peut maintenir une forte
pression d'air puisque les effets de celle-ci sont
distribués ; d'autre part, grâce à la diminution de la
pression du coussin d'air et à ce flux d'air
multidirectionnel, le débit de fuite sur les bords du papier
est fortement diminué et l'on ne rencontre plus les effets
"de drapeau" au voisinage des bords de la bande.The presence of the teeth constitutes neutralized
La buse C présente la même structure que la buse de l'art
antérieur A mais on constate que les tôles externes droite et
gauche ont été embouties localement, la tôle externe venant
ainsi au contact de la tôle interne, pour constituer des
zones neutralisées réparties le long de la buse ; l'espace
situé entre deux zones neutralisées est une fenêtre 13 ; les
tôles externe et interne sont de préférence collées ou
soudées aux emplacements de contact.Nozzle C has the same structure as the nozzle of art
previous A but we note that the right and outer plates
left were stamped locally, the external sheet coming from
thus in contact with the internal sheet, to constitute
neutralized zones distributed along the nozzle; space
located between two neutralized zones is a
La largeur Ln des zones neutralisées est d'environ 50 mm et celle Lf des fenêtres est d'environ 20 mm ; le rapport Ln/Lf est égal à 2,5.The width L n of the neutralized zones is approximately 50 mm and that L f of the windows is approximately 20 mm; the ratio L n / L f is equal to 2.5.
On constate ici également que les zones neutralisées de la fente de gauche ont été alternées par rapport à celles de la fente de droite de sorte que les fenêtres sont disposées en quinconce.We also note here that the neutralized zones of the left slit were alternated with those of the right slot so the windows are arranged in a staggered arrangement.
La figure 3 montre des vues de dessus de plusieurs arrangements possibles des zones neutralisées pour les buses d'un sécheur.Figure 3 shows top views of several possible arrangements of neutralized zones for nozzles a dryer.
On a représenté en traits pleins les zones neutralisées de largeur Ld, respectivement Ln, selon qu'il s'agisse d'un peigne, respectivement de tôle emboutie, et en traits hachurés les créneaux, respectivement les fenêtres, de largeur Lc, respectivement Lf, selon les mêmes hypothèses.The neutralized zones of width L d , respectively L n , have been shown in solid lines, depending on whether it is a comb, respectively of stamped sheet metal, and in hatched lines the slots, respectively the windows, of width L c , respectively L f , according to the same assumptions.
La ligne a montre une fente dont les zones neutralisées (Ld,Ln) ont 20 mm de largeur et dont les créneaux ou les fenêtres (Lc,Lf) ont 40 mm de largeur ; le rapport Ld/Lc ou Ln/Lf est égal à 0,5.Line a shows a slit whose neutralized areas (L d , L n ) are 20 mm wide and whose slots or windows (L c , L f ) are 40 mm wide; the ratio L d / L c or L n / L f is equal to 0.5.
Pour la ligne b, Ld égale Ln égale 3 mm, et Lc égale Lf égale 30 mm, de sorte que Ld/Lc égale Ln/Lf égale 0,1.For line b, L d equals L n equals 3 mm, and L c equals L f equals 30 mm, so that L d / L c equals L n / L f equals 0.1.
Pour la ligne c au contraire, Ld égale Ln égale 40 mm et Lc égale Lf égale 4 mm, donc Ld/Lc égale Ln/Lf égale 10.For line c, on the contrary, L d equals L n equals 40 mm and L c equals L f equals 4 mm, so L d / L c equals L n / L f equals 10.
Pour les lignes d1, d2 et d3, on a représenté trois fentes successives des buses d'une série, décalées les unes par rapport aux autres d'un pas π de 10 mm ; pour des valeurs de Ld ou Ln de 20 mm, et des valeurs de Lc ou Lf de 40 mm, le décalage π de 10 mm est égal à (Ld+Lc)/n, ou encore (Ln+Lf)/n, soit 60/n, donc n est égal à 6.For the lines d 1 , d 2 and d 3 , there are shown three successive slots of the nozzles of a series, offset with respect to each other by a pitch π of 10 mm; for values of L d or L n of 20 mm, and values of L c or L f of 40 mm, the offset π of 10 mm is equal to (L d + L c ) / n, or even (L n + L f ) / n, i.e. 60 / n, so n is equal to 6.
Les lignes e1 à e6 représentent les fentes d'une buse située dans le plan supérieur P1 (lignes e1, e2) puis celles d'une buse voisine mais située dans le plan inférieur P2 (lignes e3, e4), puis celles de la buse voisine suivante à nouveau située dans le plan supérieur P1 (lignes e5, e6) ; dans ce cas, les zones neutralisées des lignes e1, e3, e5 sont décalées d'un pas π1 de 10 mm, tandis que les zones neutralisées des lignes e2, e4, e6 sont elles décalées d'un pas π2 de 20 mm ; si l'on a des valeurs identiques de Ld (ou Ln) de 15 mm et des valeurs identiques de Lc (ou Lf) de 25 mm pour toutes les fentes, on a :
- π1 égale 10 mm pour e1, e3, e5, donc n1 est égal à 4,
- π2 égale 20 mm pour e2, e4, e6, donc n2 est égal à 2.
- π 1 equals 10 mm for e 1 , e 3 , e 5 , so n 1 is equal to 4,
- π 2 equals 20 mm for e 2 , e 4 , e 6 , so n 2 is equal to 2.
On peut ainsi faire varier la disposition des zones neutralisées et des zones laissées libres aussi bien pour les fentes des buses supérieures que pour celles des buses inférieures ou pour les fentes à la fois des buses inférieures et supérieures.We can thus vary the layout of the zones neutralized and areas left free for both upper nozzle slots than for nozzle slots lower or for both slots of the nozzles lower and upper.
Claims (7)
- Device for drying a material in strip form (1), particularly paper in strip form, including, on a frame (2), two series (S1, S2) of drying nozzles (3) delimiting, in one plane (P), a corridor for the passage of the material in strip form over a path (T), each of the series of drying nozzles being located in a plane (P1, P2) substantially parallel to the plane (P), the drying nozzles being perpendicular to the path of the material, each nozzle comprising at least one narrow longitudinal slit (4) suitable for allowing a drying gas (5), for example air, to flow therethrough, said longitudinal slit being delimited by the space contained between two substantially parallel longitudinal metal plates, an inner one (12) and an outer one (11), fixed to the nozzle by known means, blocking means being provided to selectively neutralize a plurality of areas (6) of at least one slit, characterized in that the said neutralized areas (6) are formed by local stamping to press the outer plate (11) against the inner plate, the space between two neutralized areas forming a window (13) through which the drying gas flows.
- Device for drying a material in strip form according to claim 1, characterized in that the neutralized areas (6) are regularly distributed along the narrow longitudinal slits (4).
- Device for drying a material in strip form according to claim 1 or 2, wherein each nozzle includes two narrow longitudinal slits (4), characterized in that the neutralized areas (6) of the two slits are offset.
- Device for drying a material in strip form according to claim 3, characterized in that the neutralized areas (6) of the two slits are staggered.
- Device for drying a material in strip form according to any one of the preceding claims, characterized in that the successive neutralized areas (6) of the slits (4) in the nozzles of one or the other, or of both, of the series of nozzles are offset by a given pitch (π).
- Device for drying a material in strip form according to any one of the preceding claims, characterized in that the ratio of the constant width (Ln) of the neutralized areas (6) of a slit (4) to the constant width (Lf) of the windows (13) of this slit assumes a value of 0.3 to 0.7.
- Device for drying a material in strip form according to claims 5 and 6, characterized in that the offsetting pitch (π) of the successive neutralized areas (6) of the slits (4) in the nozzles is equal to (Ln+Lf)/n, where n has a value of 2 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9307987 | 1993-06-30 | ||
| FR9307987A FR2708340B1 (en) | 1993-06-30 | 1993-06-30 | Device for drying a strip material, in particular strip paper. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0632243A1 EP0632243A1 (en) | 1995-01-04 |
| EP0632243B1 true EP0632243B1 (en) | 1998-11-18 |
Family
ID=9448739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94401368A Expired - Lifetime EP0632243B1 (en) | 1993-06-30 | 1994-06-17 | Apparatus for drying strips, in particular paper strips |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5557861A (en) |
| EP (1) | EP0632243B1 (en) |
| AT (1) | ATE173536T1 (en) |
| CA (1) | CA2126545A1 (en) |
| DE (1) | DE69414646T2 (en) |
| ES (1) | ES2124377T3 (en) |
| FR (1) | FR2708340B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10326864B3 (en) * | 2003-06-14 | 2005-02-03 | Fritz Hockemeyer | Process for curing crosslinkable silicones in coating technology |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1054251A (en) * | 1951-05-15 | 1954-02-09 | Vits Elektro G M B H | Blowing nozzles for dryers for sheet-shaped products |
| FR1149169A (en) * | 1955-03-14 | 1957-12-20 | Vits Elektro G M B H | Installation of blower nozzles for dryers for strip products |
| DE1097942B (en) * | 1958-05-24 | 1961-01-26 | Krantz Soehne H | Nozzle arrangement for the floating guidance of webs in nozzle dryers |
| US3002700A (en) * | 1958-07-26 | 1961-10-03 | Mohring Gustav | Nozzle on heat-treatment machines for textile fabrics and the like |
| DE1097943C2 (en) * | 1958-10-11 | 1974-04-04 | Krantz Soehne H | Nozzle arrangement for floating guidance of material webs in nozzle dryers |
| US3462851A (en) * | 1966-12-09 | 1969-08-26 | Midland Ross Corp | Web treating apparatus |
| DE2443395B2 (en) * | 1974-09-11 | 1978-09-28 | Lindauer Dornier Gesellschaft Mbh, 8990 Lindau | Device for the heat treatment of flat material webs by means of a flowing medium in a circulatory process |
| US3982327A (en) * | 1975-05-01 | 1976-09-28 | Midland-Ross Corporation | Air-dispensing web-floating apparatus |
| DE2613135C3 (en) * | 1976-03-27 | 1978-11-23 | Vits-Maschinenbau Gmbh, 4018 Langenfeld | Air cushion nozzle |
| DE3904774C1 (en) * | 1989-02-17 | 1990-05-17 | Hilmar 5653 Leichlingen De Vits |
-
1993
- 1993-06-30 FR FR9307987A patent/FR2708340B1/en not_active Expired - Fee Related
-
1994
- 1994-06-17 AT AT94401368T patent/ATE173536T1/en not_active IP Right Cessation
- 1994-06-17 EP EP94401368A patent/EP0632243B1/en not_active Expired - Lifetime
- 1994-06-17 DE DE69414646T patent/DE69414646T2/en not_active Expired - Fee Related
- 1994-06-17 ES ES94401368T patent/ES2124377T3/en not_active Expired - Lifetime
- 1994-06-20 US US08/262,992 patent/US5557861A/en not_active Expired - Lifetime
- 1994-06-22 CA CA002126545A patent/CA2126545A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| ES2124377T3 (en) | 1999-02-01 |
| ATE173536T1 (en) | 1998-12-15 |
| FR2708340B1 (en) | 1995-10-13 |
| US5557861A (en) | 1996-09-24 |
| FR2708340A1 (en) | 1995-02-03 |
| EP0632243A1 (en) | 1995-01-04 |
| CA2126545A1 (en) | 1994-12-31 |
| DE69414646T2 (en) | 1999-04-22 |
| DE69414646D1 (en) | 1998-12-24 |
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