WO2008061387A1 - Coating-film application head - Google Patents
Coating-film application head Download PDFInfo
- Publication number
- WO2008061387A1 WO2008061387A1 PCT/CH2007/000579 CH2007000579W WO2008061387A1 WO 2008061387 A1 WO2008061387 A1 WO 2008061387A1 CH 2007000579 W CH2007000579 W CH 2007000579W WO 2008061387 A1 WO2008061387 A1 WO 2008061387A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- surface portion
- semi
- cylindrical surface
- head according
- application head
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
- B05C5/008—Slide-hopper curtain coaters
Definitions
- the present application relates to devices for applying a film in the form of a liquid curtain on a flexible support.
- the flexible support may be of any material, for example paper, cardboard, metal or synthetic material, the film, once applied to the surface of said support and after drying, may have a protective function, marking or other.
- Photographic paper, inkjet printing papers or adhesive films are good illustrations of an oapier medium having received such a functional layer.
- Apparatuses for such an application comprise an application head comprising an application lip, over which the film flows under the effect of gravity to reach the support on which it is applied and which runs under the head application.
- This trajectory deformation depends on several factors, in particular on the speed of displacement of the liquid film, or on its flow rate, on the physical characteristics of the liquid, such as its rheology or surface tension, and on the shape of the lip. application.
- This trajectory deformation strongly affects the quality of application of the layer on the flexible support, in particular affects the control of the application of the film on the lateral edges of the layer, in view of the inaccuracy of position of the application line. of the film on the support, this deformation also affects the thickness of the deposited layer which can not be constant.
- the device of US 5,462,598 causes a significant residual deformation of the curtain for low viscosity applications, such as viscosities of less than 100 mPa.s, as well as for high viscosity applications, such as viscosities. above 250 mPa.s, especially at low flow rates.
- low viscosity applications such as viscosities of less than 100 mPa.s
- high viscosity applications such as viscosities. above 250 mPa.s, especially at low flow rates.
- the geometry of the lip having a chamfer bounded by sharp edges is unfavorable to the local flow of the liquid film; Moreover, such a chamfer of very small dimensions is difficult to machine, is fragile and can easily be damaged during use, which can even be dangerous for the user, which can cause injury during its implementation or cleaning. .
- An object of the present invention is to provide a coating application head of a liquid coating film on a flexible support not meeting the disadvantages mentioned known devices, that is to say, in particular to effectively control the trajectory liquid film between the line where this film leaves the application head and that where it is applied to the flexible support, this for low or high flow rates.
- the invention proposes a coating head for a liquid coating film on a flexible support having the characteristics mentioned in claim 1. Particular embodiments and variants are described in the claims. dependent.
- FIG. 1 represents a general perspective view of an apparatus for applying a liquid coating film on a flexible support in operation
- FIG. 2 represents a section of a film application head according to the prior art, showing the teapot effect applied to the liquid film
- FIG. 3 represents a greatly enlarged sectional view of the lip of an application head according to the invention
- FIG. 4 represents a first alternative embodiment of a film application head seen in section
- Figure 5 shows another alternative embodiment of a film application head sectional views.
- Figure 1 shows an apparatus 1 for applying a film 2 on a flexible support 3 in displacement.
- the applicator apparatus 1 comprises at least one, two of which is shown in FIG. 1, supply troughs 10 of a liquid product 20, 21, these products each flowing over a flow surface 11 and combining to form a film 23, here a film comprising two layers, flowing from the apparatus 1 to join by gravity a flexible support 3 on which it is applied in the form of the film 2.
- the flexible support 3 After receiving its film 2, the flexible support 3 continues its route and passes through a drying oven not shown in the figure to solidify the film 2 on the support 3.
- the apparatus 1 further comprises two lateral cheeks 12 serving to limit the width of the film 2 applied to the flexible support 3.
- the film 23 leaves the last flow surface 11 along a lip 13, rectilinear, arranged transversely relative to the direction of passage of the liquid, forming an essential part of the application head 14, for to flow by gravitation towards the mobile support 3.
- Figure 2 which shows a sectional view of an application head according to the prior art, illustrates well the tea effect to eliminate.
- the film 23 formed on the flow surfaces 11 from the feed troughs 20, 21 flows towards the application head 14, respectively of the lip 13. Arrived on this lip, instead of immediately leaving the application head 14 and flow by gravity, it wets a rear surface portion 140 located after the lip 13.
- the line that the film 23 leaves the head of application is shifted backwards and film 23, during its fall under gravity, takes a look arched backwards.
- These two movements cause a strong displacement towards the rear of the impact line of the film 23 on the flexible support 3, this impact taking place along line 230 instead of the theoretical line 230 '.
- This displacement of the impact line does not make it possible to optimize the application apparatus 1, nor to deposit the film 23 according to operating efficiency conditions of the optimum apparatus; it greatly increases the rejections for lack of application of the film 2 on the flexible support 3.
- a first improvement of the flow conditions of the film 23 as it leaves the lip 13 of the application head 14 is obtained by working on the geometry of this application head 14, respectively of the lip 13.
- Figure 3 shows on an enlarged scale the possible configurations of an application head 14 according to the invention seen in section.
- the lip 13 is not acute but consists of two semi-cylindrical portions 130 and 131 contiguous and tangent along a horizontal plane, along a vertical plane X.
- the radius R130 of the portion 130 is between 0.050 mm and 3 mm, preferably being equal to 0.50 mm.
- the ratio R131 / R130 between the radii of the portions 131 and 130 is between 1 and 10, preferably being equal to ⁇ , ie the number of gold equivalent to approximately 1.618.
- the semi-cylindrical surface portion 131 is preceded by a flat surface portion 141 tangent to the surface portion 131.
- the angle that this portion of planar surface 141 relative to the vertical may vary between 0 °, vertical inclination, represented at 141 'and -80 °, as represented at 141 ", preferably an angle of -55 °, as represented at 141.
- the angle between the surface portions 140 and 141 may vary between 15 ° and 100 ° with a preferred value of 55 °.
- FIG. 3 only shows this last angle value applied to the surface portion 140 so as not to overload the figure.
- the length in the direction of flow of the film of the surface portion 141 is between 0.5 and 20 mm, with a preferred value of 1 mm, whereas that of the surface portion 140 is greater than 0.5 mm, preferably being of 1 mm. A higher value, for example 5 mm may be desired and used for constructive reasons of the apparatus.
- Figures 4 and 5 show two embodiments of an application head meeting the angular characteristics mentioned above.
- the head Application 14 is particularly intended for low-viscosity liquid medium-viscosity application apparatuses forming film 23, for example a flow rate of less than 2 cm 3 / s.cm and a viscosity of less than 30 ° C
- the application head 14 is particularly intended for medium-high-viscosity liquid flow application apparatus having, for example, a flow rate greater than 4 cm 3 / s.cm and a viscosity greater than 30OcP.
- FIGS. 4 and 5 show portions of flat and / or semi-cylindrical surfaces 12 tangentially tangential to each other, in particular enabling the surface portion 141 to be connected in a continuous manner to the last flow surface 11.
- a further improvement in the control of the separation line of the film 23 of the application head 14 is provided by a layout of the surface state of the surface portions 141, 131, 130 and 140.
- the flat surface portion 141 or at least a portion of this surface portion near the surface portion 131 may be roughened by any suitable machining process by material removal, such as milling, grinding, sanding, micro etching or other, or by any suitable chemical process, or by depositing a coating, whether or not containing particles which after drying, polymerization or hardening will have the desired roughness.
- This roughness can be obtained by a regular structure, as described for example in "Drag reduction and improvement of material transport in creeping films" by M. Scholle and N. Askel, Arch. Appl. Mech. 2006, or irregular roughness on the surface portion in question.
- a roughness, regular or irregular, of average amplitude greater than 0.2 microns, preferably worth about 0.6 microns.
- This same surface state can also be applied to all or part of the adjacent semi-cylindrical surface portion 131.
- the surface portion 140 may also receive a surface treatment, in this case be covered with a layer of Teflon or other suitable material making it possible to reduce the surface energy of this surface portion 140 so that it is less than the surface tension of the liquid film.
- the same surface treatment can also be applied to the adjacent semi-cylindrical surface portion 130. All or part of the semi-cylindrical surface portion 131 can also receive the same treatment if this surface has not already been roughened by the treatment. previous.
Landscapes
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Tête d'application d'un film de revêtement. Application head of a coating film.
La présente demande concerne les dispositifs d'application d'un film sous forme d'un rideau liquide sur un support souple. Le support souple peut être de n'importe quel matériau, par exemple papier, carton, métal ou matériau synthétique, le film, une fois appliqué sur la surface dudit support et après séchage, pouvant avoir une fonction de protection, de marquage ou autre. Le papier photographique, les papiers d'impression à jet d'encre ou les films adhésifs sont de bonnes illustrations d'un support oapier ayant reçu une telle couche fonctionnelle.The present application relates to devices for applying a film in the form of a liquid curtain on a flexible support. The flexible support may be of any material, for example paper, cardboard, metal or synthetic material, the film, once applied to the surface of said support and after drying, may have a protective function, marking or other. Photographic paper, inkjet printing papers or adhesive films are good illustrations of an oapier medium having received such a functional layer.
En général, on peut déposer simultanément plusieurs couches superposées constituées chacune d'un liquide de composition différente, chacune desdites couches ayant sa propre fonction sur le produit fini.In general, it is possible to deposit simultaneously several superimposed layers each consisting of a liquid of different composition, each of said layers having its own function on the finished product.
Les appareils permettant une telle application comportent une tête d'application comprenant une lèvre d'application, par-dessus laquelle le film s'écoule sous l'effet de la gravité pour rejoindre le support sur lequel il est appliqué et qui défile sous la tête d'application.Apparatuses for such an application comprise an application head comprising an application lip, over which the film flows under the effect of gravity to reach the support on which it is applied and which runs under the head application.
Un problème rencontré par de tels appareils provient de la forme de la tête d'application ; lorsque le film de liquide quitte la tête d'application par une lèvre, afin de s'écouler sous la forme d'un rideau par l'effet de la gravité afin d'être appliqué sur le support souple, ce liquide a tendance à mouiller une portion importante de la face arrière de la lèvre d'application rendant imprécise la position de la ligne où ce film de liquide quitte la tête, déformant sa trajectoire et rendant hors de contrôle la ligne où le film de liquide est appliqué sur le support souple. Cet effet est appelé « l'effet théière » ou « Teapot effect ».A problem encountered by such devices comes from the shape of the application head; when the liquid film leaves the application head by a lip, in order to flow in the form of a curtain by the effect of gravity to be applied on the flexible support, this liquid tends to wet a large portion of the rear face of the applicator lip rendering inaccurate the position of the line where this film of liquid leaves the head, deforming its trajectory and rendering out of control the line where the film of liquid is applied to the flexible support . This effect is called the "teapot effect".
Cette déformation de trajectoire dépend de plusieurs facteurs, en particulier de la vitesse c'a déplacement du film liquide, respectivement de son débit, des caractéristiques physiques propres du liquide comme sa rhéologie ou sa tension de surface ainsi que de la forme de la lèvre d'application. Cette déformation de trajectoire affecte fortement la qualité d'application de la couche sur le support souple, en particulier affecte le contrôle de l'application du film sur les bordures latérales de la couche, vue l'imprécision de position de la ligne d'application du film sur le support, cette déformation affecte en outre l'épaisseur de la couche déposée qui ne peut pas être constante.This trajectory deformation depends on several factors, in particular on the speed of displacement of the liquid film, or on its flow rate, on the physical characteristics of the liquid, such as its rheology or surface tension, and on the shape of the lip. application. This trajectory deformation strongly affects the quality of application of the layer on the flexible support, in particular affects the control of the application of the film on the lateral edges of the layer, in view of the inaccuracy of position of the application line. of the film on the support, this deformation also affects the thickness of the deposited layer which can not be constant.
Divers essais ont déjà été tentés afin de résoudre ce problème, en particulier les brevets US 4.109.611, US 4.510.882 et US 5.462.598 décrivent chacun une géométrie particulière de la lèvre d'une tête d'application. Malheureusement les géométries proposées dans ces documents ne permettent pas un contrôle efficace de la trajectoire du film liquide pour certaines applications.Various attempts have already been made to solve this problem, in particular patents US 4,109,611, US 4,510,882 and US 5,462,598 each describe a particular geometry of the lip of an application head. Unfortunately, the geometries proposed in these documents do not allow effective control of the trajectory of the liquid film for certain applications.
En particulier, le dispositif de US 5.462.598 provoque une déformation résiduelle importante du rideau pour des applications à faible viscosité, comme par exemple des viscosités inférieures à 100 mPa.s, ainsi que pour des applications à haute viscosité, comme par exemple des viscosités supérieures 250 mPa.s, particulièrement aux faibles débits. De plus, on a un mouillage permanent de la face arrière de la lèvre à basse viscosité pour un débit inférieure à 3 cm3/cm. Pour tous ces documents cités, la géométrie de la lèvre comportant un chanfrein limité par des arêtes vives est défavorable à l'écoulement local du film liquide ; par ailleurs un tel chanfrein de très faibles dimensions est difficile à usiner, est fragile et peut facilement être endommagé en cours d'utilisation, pouvant même être dangereux pour l'utilisateur, pouvant provoquer des blessures lors de sa mise en œuvre ou de son nettoyage.In particular, the device of US 5,462,598 causes a significant residual deformation of the curtain for low viscosity applications, such as viscosities of less than 100 mPa.s, as well as for high viscosity applications, such as viscosities. above 250 mPa.s, especially at low flow rates. In addition, there is a permanent wetting of the rear face of the low viscosity lip for a flow rate of less than 3 cm 3 / cm. For all these documents cited, the geometry of the lip having a chamfer bounded by sharp edges is unfavorable to the local flow of the liquid film; Moreover, such a chamfer of very small dimensions is difficult to machine, is fragile and can easily be damaged during use, which can even be dangerous for the user, which can cause injury during its implementation or cleaning. .
Un but de la présente invention est de proposer une tête d'application d'un film liquide de revêtement sur un support souple ne rencontrant pas les inconvénients mentionnés des dispositifs connus, c'est-à-dire permettant en particulier de contrôler efficacement la trajectoire du film liquide entre la ligne où ce film quitte la tête d'application et celle où il est appliqué sur le support souple, ceci pour de faibles ou de forts débits. Afin d'atteindre ce but, l'invention propose une tête d'application d'un film liquide de revêtement sur un support souple possédant les caractéristiques mentionnées dans la revendication 1. Des formes d'exécution particulières et des variantes sont décrites dans les revendications dépendantes.An object of the present invention is to provide a coating application head of a liquid coating film on a flexible support not meeting the disadvantages mentioned known devices, that is to say, in particular to effectively control the trajectory liquid film between the line where this film leaves the application head and that where it is applied to the flexible support, this for low or high flow rates. In order to achieve this object, the invention proposes a coating head for a liquid coating film on a flexible support having the characteristics mentioned in claim 1. Particular embodiments and variants are described in the claims. dependent.
L'invention est décrite ci-dessous en détail, cette description étant à considérer en regard du dessin annexé comportant les figures ou :The invention is described below in detail, this description being to be considered with reference to the appended drawing comprising the figures or:
la figure 1 représente une vue générale en perspective d'un appareil d'application d'un film de revêtement liquide sur un support souple en fonctionnement,FIG. 1 represents a general perspective view of an apparatus for applying a liquid coating film on a flexible support in operation,
la figure 2 représente une coupe d'une tête d'application d'un film selon l'art antérieur, montrant l'effet théière appliqué au film liquide,FIG. 2 represents a section of a film application head according to the prior art, showing the teapot effect applied to the liquid film,
la figure 3 représente une vue en coupe fortement agrandie de la lèvre d'une tête d'application selon l'invention,FIG. 3 represents a greatly enlarged sectional view of the lip of an application head according to the invention,
la figure 4 représente une première variante d'exécution d'une tête d'application d'un film vues en coupe, etFIG. 4 represents a first alternative embodiment of a film application head seen in section, and
la figure 5 représente une autre variante d'exécution d'une tête d'application d'un film vues en coupe.Figure 5 shows another alternative embodiment of a film application head sectional views.
La figure 1 montre un appareil 1 d'application d'un film 2 sur un support souple 3 en déplacement. L'appareil d'application 1 comprend au moins une, deux étant représentées sur la figure 1 , goulottes d'alimentation 10 d'un produit liquide 20, 21 , ces produits s'écoulant chacun par-dessus une surface d'écoulement 11 et se combinant afin de former un film 23, ici un film comprenant deux couches, s'écoulant de l'appareil 1 pour rejoindre par gravité un support souple 3 sur lequel il est appliqué sous forme du film 2. Après avoir reçu son film 2, le support souple 3 continue sa route et passe par un four de séchage non représenté sur la figure afin de solidifier le film 2 sur le support 3. L'appareil 1 comprend encore deux joues latérales 12 servant à limiter Ia largeur du film 2 appliqué sur le support souple 3.Figure 1 shows an apparatus 1 for applying a film 2 on a flexible support 3 in displacement. The applicator apparatus 1 comprises at least one, two of which is shown in FIG. 1, supply troughs 10 of a liquid product 20, 21, these products each flowing over a flow surface 11 and combining to form a film 23, here a film comprising two layers, flowing from the apparatus 1 to join by gravity a flexible support 3 on which it is applied in the form of the film 2. After receiving its film 2, the flexible support 3 continues its route and passes through a drying oven not shown in the figure to solidify the film 2 on the support 3. The apparatus 1 further comprises two lateral cheeks 12 serving to limit the width of the film 2 applied to the flexible support 3.
On remarque sur la figure que le film 23 quitte la dernière surface d'écoulement 11 le long d'une lèvre 13, rectiligne, disposée transversalement relativement au sens de passage du liquide, formant une partie essentielle de la tête d'application 14, pour s'écouler par gravitation en direction dû support mobile 3.It should be noted in the figure that the film 23 leaves the last flow surface 11 along a lip 13, rectilinear, arranged transversely relative to the direction of passage of the liquid, forming an essential part of the application head 14, for to flow by gravitation towards the mobile support 3.
La figure 2, qui représente une vue en coupe d'une tête d'applications selon l'art antérieur, illustre bien l'effet théière à éliminer.Figure 2, which shows a sectional view of an application head according to the prior art, illustrates well the tea effect to eliminate.
Le film 23, formé sur les surfaces d'écoulement 11 à partir des goulottes d'alimentation 20, 21 s'écoule en direction de la tête d'application 14, respectivement de la Ièvre13. Arrivé sur cette lèvre, au lieu de quitter immédiatement la tête d'application 14 et de s'écouler par gravité, il mouille une portion de surface arrière 140 située après la lèvre 13. La ligne selon laquelle le film 23 quitte la tête d'application est donc décalée vers l'arrière et te film 23, durant sa chute sous gravité, prend une allure arquée vers l'arrière. Ces deux mouvements provoquent un fort déplacement vers l'arrière de la ligne d'impact du film 23 sur le support souple 3, cet impact ayant lieu selon ligne 230 au lieu de la ligne 230' théorique. Ce déplacement de la ligne d'impact ne permet pas une optimisation de l'appareil d'application 1, ni de déposer le film 23 selon des conditions de rendement de fonctionnement de l'appareil optimum ; il augmente fortement les rejets pour défaut d'application du film 2 sur le support souple 3.The film 23 formed on the flow surfaces 11 from the feed troughs 20, 21 flows towards the application head 14, respectively of the lip 13. Arrived on this lip, instead of immediately leaving the application head 14 and flow by gravity, it wets a rear surface portion 140 located after the lip 13. The line that the film 23 leaves the head of application is shifted backwards and film 23, during its fall under gravity, takes a look arched backwards. These two movements cause a strong displacement towards the rear of the impact line of the film 23 on the flexible support 3, this impact taking place along line 230 instead of the theoretical line 230 '. This displacement of the impact line does not make it possible to optimize the application apparatus 1, nor to deposit the film 23 according to operating efficiency conditions of the optimum apparatus; it greatly increases the rejections for lack of application of the film 2 on the flexible support 3.
Une première amélioration des conditions d'écoulement du film 23 lorsqu'il quitte la lèvre 13 de la tête d'application 14 est obtenue en travaillant sur la géométrie de cette tête d'application 14, respectivement de la lèvre 13.A first improvement of the flow conditions of the film 23 as it leaves the lip 13 of the application head 14 is obtained by working on the geometry of this application head 14, respectively of the lip 13.
La figure 3 montre à échelle agrandie les configurations possibles d'une tête d'application 14 selon l'invention vue en coupe. Tout d'abord on constate que la lèvre 13 n'est pas aiguë mais est constituée de deux portions semi cylindriques 130 et 131 contiguës et tangentes selon un plan horizontal, le long d'un plan vertical X. Le rayon R130 de la portion 130 est compris entre 0.050 mm et 3 mm, de préférence étant égal à 0.50 mm. Le rapport R131 / R130 entre les rayons des portions 131 et 130 est compris entre 1 et 10 , de préférence étant égal à φ soit le nombre d'or équivalent approximativement à 1.618. En variante, on peut aussi avoir une seule surface semi cylindrique d'un rayon compris entre 0.050 mm et 3 mm.Figure 3 shows on an enlarged scale the possible configurations of an application head 14 according to the invention seen in section. Firstly, it is found that the lip 13 is not acute but consists of two semi-cylindrical portions 130 and 131 contiguous and tangent along a horizontal plane, along a vertical plane X. The radius R130 of the portion 130 is between 0.050 mm and 3 mm, preferably being equal to 0.50 mm. The ratio R131 / R130 between the radii of the portions 131 and 130 is between 1 and 10, preferably being equal to φ, ie the number of gold equivalent to approximately 1.618. As a variant, it is also possible to have a single semi-cylindrical surface with a radius of between 0.050 mm and 3 mm.
Dans le sens d'écoulement du film, la portion de surface semi cylindrique 131 est précédée d'une portion de surface plane 141 tangente à la portion de surface 131. Selon les besoins, comme il sera indiqué plus bas, l'angle que fait cette portion de surface plane 141 relativement à la verticale peut varier entre 0°, inclinaison verticale, représentée en 141 'et -80°, comme représenté en 141". De préférence on choisira un angle de -55°, comme représenté en 141.In the flow direction of the film, the semi-cylindrical surface portion 131 is preceded by a flat surface portion 141 tangent to the surface portion 131. As required, as will be indicated below, the angle that this portion of planar surface 141 relative to the vertical may vary between 0 °, vertical inclination, represented at 141 'and -80 °, as represented at 141 ", preferably an angle of -55 °, as represented at 141.
Après avoir passé par la 2eme portion de surface semi cylindrique 130, on rencontre la portion de surface arrière 140, tangente à la 2ème portion de surface semi cylindrique 130. L'angle entre les portions de surfaces 140 et 141 peut varier entre 15 ° et 100° avec une valeur préférentielle de 55°. La figure 3 ne montre que cette dernière valeur d'angle appliquée à la portion de surface 140, afin de ne pas surcharger la figure.After having passed through the 2 nd portion of semi-cylindrical surface 130, it encounters the rear surface portion 140, tangent to the 2 nd semi-cylindrical surface portion 130. The angle between the surface portions 140 and 141 may vary between 15 ° and 100 ° with a preferred value of 55 °. FIG. 3 only shows this last angle value applied to the surface portion 140 so as not to overload the figure.
La longueur dans le sens d'écoulement du film de la portion de surface 141 est comprise entre 0.5 et 20 mm, avec une valeur préférentielle de 1 mm, alors que celle de la portion de surface 140 est supérieure à 0.5 mm, étant de préférence de 1 mm. Une valeur supérieure, par exemple 5 mm peut être désirée et utilisée pour des raisons constructives de l'appareil.The length in the direction of flow of the film of the surface portion 141 is between 0.5 and 20 mm, with a preferred value of 1 mm, whereas that of the surface portion 140 is greater than 0.5 mm, preferably being of 1 mm. A higher value, for example 5 mm may be desired and used for constructive reasons of the apparatus.
Les figures 4 et 5 montrent deux formes d'exécution d'une tête d'application répondant aux caractéristiques angulaires mentionnées ci- dessus. Selon la configuration représentée à la figure 4 la tête d'application 14 est particulièrement destinée pour des appareils d'application à débit moysn à faible d'un liquide de faible viscosité formant le film 23, par exemple un débit inférieur à 2 cm3/s.cm et une viscosité inférieure à 3OcP, alors que la configuration de la figure 5 la tête d'application 14 est particulièrement destinée à des appareils d'application à débit moyen à fort d'un liquide de haute viscosité ayant par exemple un débit supérieur à 4 cm3/s.cm et une viscosité supérieure à 30OcP. On remarque sur les figures 4 et 5 des portions de surfaces 12, planes et/ou semi cylindriques, tangentes entre elles, permettant notamment de raccorder de manière continue la portion de surface 141 à la dernière surface d'écoulement 11.Figures 4 and 5 show two embodiments of an application head meeting the angular characteristics mentioned above. According to the configuration shown in Figure 4 the head Application 14 is particularly intended for low-viscosity liquid medium-viscosity application apparatuses forming film 23, for example a flow rate of less than 2 cm 3 / s.cm and a viscosity of less than 30 ° C, whereas the configuration of FIG. 5, the application head 14 is particularly intended for medium-high-viscosity liquid flow application apparatus having, for example, a flow rate greater than 4 cm 3 / s.cm and a viscosity greater than 30OcP. FIGS. 4 and 5 show portions of flat and / or semi-cylindrical surfaces 12 tangentially tangential to each other, in particular enabling the surface portion 141 to be connected in a continuous manner to the last flow surface 11.
La modification de géométrie de la tête d'application proposée ci- dessus permet déjà de mieux contrôler la ligne de séparation du film 23 de ladite tête, améliorant ainsi le contrôle de la position d'impact du film sur le support souple.The modification of the geometry of the application head proposed above already makes it possible to better control the line of separation of the film 23 of said head, thus improving the control of the impact position of the film on the flexible support.
Une amélioration supplémentaire du contrôle de la ligne de séparation du film 23 de la tête d'application 14 est proposée par un aménagement de l'état de surface des portions de surfaces 141 , 131 , 130 et 140.A further improvement in the control of the separation line of the film 23 of the application head 14 is provided by a layout of the surface state of the surface portions 141, 131, 130 and 140.
Tout d'abord la portion de surface plane 141 ou au moins une partie de cette portion de surface proche de la portion de surface 131 , peut être rendue rugueuse par n'importe quel procédé d'usinage approprié par enlèvement de matière, comme par exemple fraisage, meulage, sablage, micro gravage ou autre, ou par n'importe quel procédé chimique idoine, ou alors par dépôt d'un revêtement, contenant ou non des particules qui après séchage, polymérisation ou durcissage présentera la rugosité souhaitée. Par l'un ou l'autre des procédés ci- dessus ou tout autre procédé le permettant, on cherchera à obtenir une rugosité suffisante pour altérer la vitesse d'écoulement du film liquide sur cette portion de surface afin de diminuer sa résistance à l'écoulement, toutefois sans déranger ou dégrader l'uniformité du film liquide. Cette rugosité peut être obtenue par une structure régulière, comme décrite par exemple dans « Drag réduction and improvement of material transport in creeping films» par M. Scholle et N. Askel, Arch. Appl. Mech. 2006, ou irrégulière des aspérités sur la portion de surface en question. De préférence on cherchera à obtenir une rugosité, régulière ou irrégulière, d'amplitude moyenne supérieure à 0.2 μm, valant de préférence environ 0.6 μm. Ce même état de surface peut aussi être appliqué à tout ou partie de la portion de surface semi cylindrique adjacente 131.First, the flat surface portion 141 or at least a portion of this surface portion near the surface portion 131 may be roughened by any suitable machining process by material removal, such as milling, grinding, sanding, micro etching or other, or by any suitable chemical process, or by depositing a coating, whether or not containing particles which after drying, polymerization or hardening will have the desired roughness. By one or the other of the above methods or any other method allowing it, it will be sought to obtain a roughness sufficient to alter the flow rate of the liquid film on this surface portion in order to reduce its resistance to flow, however without disturbing or degrading the uniformity of the liquid film. This roughness can be obtained by a regular structure, as described for example in "Drag reduction and improvement of material transport in creeping films" by M. Scholle and N. Askel, Arch. Appl. Mech. 2006, or irregular roughness on the surface portion in question. Preferably one will seek to obtain a roughness, regular or irregular, of average amplitude greater than 0.2 microns, preferably worth about 0.6 microns. This same surface state can also be applied to all or part of the adjacent semi-cylindrical surface portion 131.
La portion de surface 140 peut aussi recevoir un traitement de surface, ici être recouverte d'une couche de téflon ou autre matériau approprié permettant de diminuer l'énergie de surface de cette portion de surface 140 de manière à ce qu'elle soit inférieure à la tension de surface du film liquide. Le même traitement de surface peut aussi être appliqué à la portion de surface semi cylindrique adjacente 130. Tout ou partie de la portion de surface semi cylindrique 131 peut aussi recevoir le même traitement si cette surface n'a pas déjà été rendue rugueuse par le traitement précédent.The surface portion 140 may also receive a surface treatment, in this case be covered with a layer of Teflon or other suitable material making it possible to reduce the surface energy of this surface portion 140 so that it is less than the surface tension of the liquid film. The same surface treatment can also be applied to the adjacent semi-cylindrical surface portion 130. All or part of the semi-cylindrical surface portion 131 can also receive the same treatment if this surface has not already been roughened by the treatment. previous.
Ainsi, par une géométrie adaptée, telle que décrite plus haut de la lèvre 13 d'une tête d'application 14, on peut déjà fortement améliorer le contrôle de la forme du film liquide 23 s'écoulant à partir de cette tête d'application, une amélioration supplémentaire étant apportée par un traitement approprié, tel que décrit, de l'un ou l'autre ou des surfaces de ladite tête directement adjacentes à la lèvre 13. De cette manière, par un meilleur contrôle de l'écoulement du film sur le support souple, la qualité d'application de ce film est fortement améliorée. Thus, by a suitable geometry, as described above of the lip 13 of an application head 14, the control of the shape of the liquid film 23 flowing from this applicator head can already be greatly improved. a further improvement being provided by appropriate treatment, as described, of either or both of the surfaces of said head directly adjacent to the lip 13. In this manner, by better control of the flow of the film on the flexible support, the application quality of this film is greatly improved.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US92147306P | 2006-11-21 | 2006-11-21 | |
| US60/921,473 | 2006-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008061387A1 true WO2008061387A1 (en) | 2008-05-29 |
Family
ID=38982541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CH2007/000579 Ceased WO2008061387A1 (en) | 2006-11-21 | 2007-11-20 | Coating-film application head |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2008061387A1 (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0017126A1 (en) * | 1979-04-03 | 1980-10-15 | Agfa-Gevaert AG | Free-falling curtain coating process and apparatus for concurrently applying several layers to passing objects, especially bands |
| EP0168986A2 (en) * | 1984-07-06 | 1986-01-22 | E.I. Du Pont De Nemours And Company | Device for the application of at least one coating layer and a process for the operation of this device |
| EP0426122A2 (en) * | 1989-10-31 | 1991-05-08 | Fuji Photo Film Co., Ltd. | Coating method |
| US5462598A (en) * | 1991-12-10 | 1995-10-31 | Eastman Kodak Company | Curtain coating device |
| JPH11267569A (en) * | 1998-03-20 | 1999-10-05 | Mitsubishi Paper Mills Ltd | Slide curtain coating device |
| EP1184087A2 (en) * | 2000-09-04 | 2002-03-06 | Fuji Photo Film Co., Ltd. | Coating method and apparatus for heat-development photo-sensitive material |
| DE10057734A1 (en) * | 2000-11-22 | 2002-05-23 | Voith Paper Patent Gmbh | Web curtain coating station, especially using a pigment suspension, has a guide in the free fall path of the coating to divide the path into two sections and reduce distorting effects on the laid coating at the moving substrate surface |
| WO2005097352A1 (en) * | 2004-04-06 | 2005-10-20 | Polytype Converting S.A. | Curtain coating device and curtain coating method |
| US20060147635A1 (en) * | 2005-01-06 | 2006-07-06 | Konica Minolta Medical & Graphic, Inc. | Coating apparatus and producing method for die coater |
-
2007
- 2007-11-20 WO PCT/CH2007/000579 patent/WO2008061387A1/en not_active Ceased
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0017126A1 (en) * | 1979-04-03 | 1980-10-15 | Agfa-Gevaert AG | Free-falling curtain coating process and apparatus for concurrently applying several layers to passing objects, especially bands |
| EP0168986A2 (en) * | 1984-07-06 | 1986-01-22 | E.I. Du Pont De Nemours And Company | Device for the application of at least one coating layer and a process for the operation of this device |
| EP0426122A2 (en) * | 1989-10-31 | 1991-05-08 | Fuji Photo Film Co., Ltd. | Coating method |
| US5462598A (en) * | 1991-12-10 | 1995-10-31 | Eastman Kodak Company | Curtain coating device |
| JPH11267569A (en) * | 1998-03-20 | 1999-10-05 | Mitsubishi Paper Mills Ltd | Slide curtain coating device |
| EP1184087A2 (en) * | 2000-09-04 | 2002-03-06 | Fuji Photo Film Co., Ltd. | Coating method and apparatus for heat-development photo-sensitive material |
| DE10057734A1 (en) * | 2000-11-22 | 2002-05-23 | Voith Paper Patent Gmbh | Web curtain coating station, especially using a pigment suspension, has a guide in the free fall path of the coating to divide the path into two sections and reduce distorting effects on the laid coating at the moving substrate surface |
| WO2005097352A1 (en) * | 2004-04-06 | 2005-10-20 | Polytype Converting S.A. | Curtain coating device and curtain coating method |
| US20060147635A1 (en) * | 2005-01-06 | 2006-07-06 | Konica Minolta Medical & Graphic, Inc. | Coating apparatus and producing method for die coater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2731731B1 (en) | Device and method for deposing a width-adjustable film of ordered particles onto a moving substrate | |
| EP2678120B1 (en) | Equipment and method for depositing a film of ordered particles on a moving substrate | |
| FR2605534A1 (en) | COATING DEVICE WITH ROTARY SQUEEGEE | |
| CH624046A5 (en) | ||
| FR2731528A1 (en) | CLEANING SHEET AND RECORDING HOLDER SET INCLUDING CLEANING SHEET | |
| EP0770006A1 (en) | Stencil for depositing and portioning variously thick spot layers of a viscous material | |
| EP0117212B1 (en) | Device for coating a continually moving sheet or strip | |
| FR2598337A1 (en) | CUNEIFORM SCRAPER FOR BANDED MATERIAL COATING MACHINE | |
| FR2570637A1 (en) | METHOD OF CUTTING GLASS OF VARIOUS THICKNESSES | |
| WO2008061387A1 (en) | Coating-film application head | |
| FR2698031A1 (en) | Edge honing device. | |
| FR2679797A1 (en) | EXTRUSION COATING APPARATUS. | |
| FR2754473A1 (en) | Deposition of viscous matter through stencil esp. for PCB manufacture | |
| EP0994778B1 (en) | Doctor blade for applying products with high degree of viscosity and thixotropic properties on a substrate varying in height, through a stencil, applied to said substrate | |
| EP1649734B1 (en) | Method and device for filling areas situated in hollows or between tracks with a viscous product on a printed circuit board and equipment using said device | |
| FR2508351A1 (en) | Feed for applying glue to moving paper strip - has gap between flattening rollers to feed glue transferred to third roller for treating paper | |
| BE852751A (en) | METHOD AND APPARATUS FOR COATING FILMS | |
| EP0842709B1 (en) | Process for continuously coating a metallurgical product in continuous motion with an organic coating and apparatus therefor | |
| EP3746395B1 (en) | Device for depositing nanometer-sized particles onto a substrate | |
| EP0434496B1 (en) | Device for preserving the planarity of a cardboard band between two successive elements of a winding machine | |
| EP0794011B1 (en) | Device and process for applying a liquid resin on a moving web | |
| WO2016135102A1 (en) | Wire cutting device comprising a system for lubricating the wire by spraying and a system for cleaning the wire by spraying | |
| FR2836860A1 (en) | Thick layer electronic print mechanism having viscous product substrate placed through mask and positive pressure difference applied across filling face during mask contact separation phase. | |
| CH688854A5 (en) | Wire saw | |
| EP2773463B1 (en) | Device for applying a liquid onto a moving substrate and method for implementing said device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07816262 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 07816262 Country of ref document: EP Kind code of ref document: A1 |