EP1140374A1 - Method and device for continuously coating a metal strip with a polymer composition - Google Patents

Method and device for continuously coating a metal strip with a polymer composition

Info

Publication number
EP1140374A1
EP1140374A1 EP99970341A EP99970341A EP1140374A1 EP 1140374 A1 EP1140374 A1 EP 1140374A1 EP 99970341 A EP99970341 A EP 99970341A EP 99970341 A EP99970341 A EP 99970341A EP 1140374 A1 EP1140374 A1 EP 1140374A1
Authority
EP
European Patent Office
Prior art keywords
strip
roller
application
support roller
polymer composition
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.)
Withdrawn
Application number
EP99970341A
Other languages
German (de)
French (fr)
Inventor
François DUBARRE
Gérard Veutin
Eugène Soirfeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
USINOR SA
Original Assignee
USINOR SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by USINOR SA filed Critical USINOR SA
Publication of EP1140374A1 publication Critical patent/EP1140374A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length

Definitions

  • the invention relates to a method and a device for continuously coating a metal strip with a polymer composition.
  • a metal strip has two faces: we will call the face to be coated: “external face”, and the opposite face: “internal face”.
  • a coating device comprises:
  • means for applying a polymer composition comprising a support roller 1 and means 3 for applying a layer of this composition to the external face Be of the strip.
  • - Continuous scrolling means of the strip adapted to scroll it on the support roller 1 so that its internal face Bi is in contact with the surface of this roller.
  • the layer it is possible to use, for example, means for direct extrusion of the polymer layer onto the strip; the extrusion means then also serve to form the layer; when this application means is used, a solvent-free polymer composition is then used and the polymer is then applied in the molten state.
  • a device comprising two rollers bearing against one another, between which the strip to be coated runs as illustrated in FIGS. 2 and 3: in addition the support roller 1, there is then an application roller 2; during application, it is the external face Be of the strip and the coating itself which come into contact with the application roller 2.
  • this application means with two rollers 1 and 2 in indirect support against each other can be used to apply the polymer by calendering: the two rollers then rotate in opposite directions and the polymer composition P to be applied is introduced between the strip B and the application roller 2.
  • this means of application can also be used in the case where a polymeric sheet N is formed on the roll.
  • application 2 for example using the means 3 and where this sheet N is then transferred from the application roller 2 to the strip B: the two rollers can then rotate in the same direction as indicated in FIG. 3.
  • the application roller 2 used is generally with a hard surface, non-deformable; these are for example metallic rollers; this limits the risk of sticking of polymer composition on the rollers.
  • the polymer composition comes into direct contact only with the application roller, and it is therefore only there that risk of bonding problems appear: the choice of a hard surface and preferably cooled limits these risks.
  • the strip to be coated is often preheated, in particular to improve the adhesion of this layer to the metal; this arrangement is particularly useful in the case of polymer compositions based on polyolefins, which are apolar and therefore adhere less easily to polar materials such as metal.
  • the backing roller is provided with heating means, it suffices then, before application of the polymer layer, to run the strip over the heated backing roller while maintaining the internal face of the strip in contact with the hot surface of this roller: the strip is thus preheated to the temperature of the roller during the interval of travel time on this roller.
  • the support roller 1 is generally with a deformable surface, for example rubber, the application roller 2 being generally with a non-deformable surface, for example metallic, to limit the risks of sticking (see above).
  • the application of thermoplastic polymer compositions it is sometimes desired to obtain coatings of amorphous structure or of low crystallinity; it is therefore important to carry out an operation of quenching after application of the layer on the strip; to be effective, quenching, or rapid cooling, must be carried out as quickly as possible after application.
  • the support roller is then heated 1 'and the application roller 2' is cooled; for the coating, the strip is then passed over the heated support roller 1 ', then between the rollers 1' and 2 'for applying the polymer layer, and finally on the application roller 2' which is cooled ; scrolling from point E to point C on the heated backing roller 1 ′ therefore serves for preheating and scrolling from point C to point S on the cooled application roller 2 ′ therefore serves for quenching.
  • the support roller 1 is therefore heated and kept in contact with the internal face Bi of the strip only before application
  • the polymer composition is applied in the molten state to the external face Be of the strip using conventional means of application,
  • the application roller 2 ′ is therefore cooled and kept in contact with the external face Be of the strip only after application.
  • the quenching begins immediately after application of the polymer layer; as cooling occurs too quickly after application of the polymer layer, good adhesion to the metal strip is not obtained.
  • the object of the invention is to offer a process making it possible to obtain coatings which are both amorphous or of low crystallinity and adherent, in a single coating step; the invention also aims to offer a much more economical process.
  • the subject of the invention is a process for continuously coating a metal strip with a polymer composition, said strip having a so-called “external” face to be coated and an opposite face called “internal”, characterized in that '' it includes the steps of:
  • the heated backing roller has a metallic surface
  • the efficiency, the homogeneity and the control of the heating of the strip are improved, which contributes to the improvement of the adhesion of the coating
  • the strip remains in contact with the heating backing roller after application of the coating polymer so as to ensure a “post-heating” of the strip, the adhesion of the coating is substantially improved.
  • the polymer composition is applied by calendering between an application roller with a deformable surface and the strip bearing on said support roller; the surface of the application roller is therefore more deformable than that of the support roller and can thus advantageously match the roughness and roughness of the strip surface to be coated.
  • the invention also relates to a device for implementing the method according to the invention, for coating a metal strip having an external face to be coated and an opposite face called internal, comprising:
  • - means for applying a layer of polymer composition on the external face of the strip comprising a support roller provided with heating means, - means for continuously running the strip defining a running path of the strip in said device, characterized in that:
  • said support roller has a non-deformable metal surface
  • said running means are adapted to run the strip on said support roller while maintaining its internal face in contact with the surface of this roller before, during and after application of said layer.
  • the device comprises two successive coating stations, one for coating the external face as previously described, and the other for coating the internal face.
  • the coating station of the internal face can have the same characteristics as that of the external face.
  • Figures 1 to 4 show devices and methods of coating the prior art: Figure 1 for a general case of application on a strip running on a support roller, Figures 2 to 4 in the case of application to the strip by an application roller bearing on the support roller, FIG. 4 in the case of rapid cooling after application, to obtain an amorphous or partially crystalline coating.
  • FIGS. 5 to 11 show various embodiments of the invention which differ from each other by the mode of application of the polymer and / or by the treatment of the strip after passing over the support roller and / or by an application single or double sided: - Application by extrusion in contact with the strip supported on the support roller: Figures 5, 6 and 7; application by calendering of a film or of a melted sheet between the support roller and an application roller: FIGS. 8 to 11. - cooling of the strip on at least one cooling roller, after application: FIGS. 5, 6, 8, 9 for the first side, 11 for the second side.
  • the device for implementing the method according to the invention for coating a metal strip B having an "external" face to be coated Be and an opposite face called “internal” Bi, comprises: - means for applying a polymer composition, comprising:
  • Means 3 for continuously scrolling the strip comprising:
  • a cooling roller 4 provided with cooling means.
  • the means 3 are suitable for applying a polymer layer in the molten state; these means are known in themselves and will not be described here in detail; these means 3 comprise for example extrusion means, and / or calendering means, and / or means for transferring the polymer sheet.
  • the strip B is passed over the roller 1" then on the roller 4, and during the scrolling on the roller 1 ", using the layer application means 3, a layer of polymer composition is applied at C on the strip.
  • the strip comes into contact with the support roller 1 "on line E and leaves the contact of this roller on line P; line P is located on the circumference of the roller well after line C in the direction of travel or rotation.
  • the strip is therefore preheated on the roll 1 "between lines E and C, then coated in zone C, then immediately” post-heated " on the same roller between lines C and P, and finally cooled by passing over the cooling roller 4 between lines R and G.
  • the polymer layer, applied to the Be side of the strip comes into direct contact with the surface of the roller 4; this arrangement can have drawbacks, for example risks of damage to the coating of the strip.
  • FIG. 6 Another configuration such as that described in FIG. 6 can be used where the travel on the cooling roller 4 'is different and adapted to prevent the coated face Be of the strip from coming into direct contact with the roller.
  • sprinkling means 5 have been arranged on the coated face Be of the strip, between the support roller 1 "and the cooling roller 4 '; these complementary cooling means make it possible to improve cooling efficiency.
  • the temperature of the 1 "roller and the length of travel between lines E and C define the preheating conditions.
  • the temperature of the 1 "roller and the length of travel between lines C and P define the post-heating conditions.
  • the temperature of the roller 4 and 4 ′, the length of travel between the lines R and G, as well as, where appropriate, the additional cooling means such as the sprinkling means 5, define the cooling conditions. Thanks to the device and method according to the invention, it is possible to carry out a post-heating operation in a very economical manner just after the application of the polymer layer, by maintaining the coated strip at the contact with the 1 "backing roller; this operation is intended to improve the adhesion of the layer to the strip.
  • the metal strip has already undergone a first preheating before traveling on the support roller 1 "; the device to implement the method according to the invention then comprises additional preheating means located upstream of the application means; conventional preheating means are used, for example by induction or by infrared radiation.
  • the coated metal strip is reheated after having passed over the 1 "support roller; the device for implementing the method according to the invention then comprises additional post-heating means installed downstream of the application means, for example in place of the cooling means 5 of FIG. 6.
  • the cooling roller 4 is installed as close as possible to the support roller 1 "to the point that the distance PR is zero or almost zero (variant of FIG. 5).
  • the roller 4 is advantageously replaced by a heating device 6 suitable for baking this polymer.
  • the cooling means main like the rollers 4 or 4 ′, or complementary like the sprinkling means 5, are adapted to a manner known in itself for obtaining rapid quenching capable of forming a coating having a strongly amorphous structure. Thanks to the invention, there is then obtained, in a very economical manner, a coating which is both highly amorphous thanks to the quenching and strongly adherent thanks to the post-heating, under easily controllable conditions.
  • the layer of polymer composition is applied between two rollers between which the strip passes, in particular when this layer is applied by calendering (of film or of ply) or by transfer (of polymer ply), in addition to the roll of support with a non-deformable metal surface, an application roller with a deformable surface is then used, in support against this support roller.
  • the use of an application roller with a deformable surface is possible because the support roller has a non-deformable surface; the use of an application roller with deformable surface makes it possible to apply the polymer coating in a very homogeneous manner on the metal strip, to ensure a very homogeneous contact between the coating and the strip at all points of this strip whatever its roughness and roughness, and to avoid trapping air bubbles between the strip and the coating.
  • deformable surface is understood to mean a surface capable of deforming so as to match the roughness reliefs of the strip under the conditions of support of the application roller on the support roller; as an example of a roller with a deformable surface, rollers with a deformable rubber surface can be used.
  • FIG. 8 is similar to FIG. 5, with the difference that the polymer composition P is applied by calendering a film or a melted sheet of polymer between the application roller 2 "and the support roller 1 ".
  • the device preferably comprises means for cooling the application roller.
  • FIG. 9 illustrates a means of direct cooling of the surface of this roller .
  • FIG. 9 is similar to FIG. 8, with the difference that a flexible metallic skirt J for cooling is further scrolled around the application roller 2 ", this skirt J cooling itself by scrolling on contact d '' a skirt cooling roller 7.
  • the cooling of the 2 "application roller should be limited so as to maintain sufficient elasticity of its deformable surface.
  • FIG. 10 illustrates a device according to the invention for two-layer coating; the application of the first layer of polymer P on the first face of the strip B is carried out in the same way as in FIG. 8, with here a cooling roller 4 very close to the support roller 1 "to obtain a immediate hardening of the coating; at the end of the hardening, the strip coated on one side is then deflected by a deflector roller 10 so as to present its other face to the coating with a polymer P "between two rollers 1 and 2, in a manner similar to that illustrated in Figure 2; the surface and the temperature of the roller 1 are adapted to the polymer P "which comes into contact with this roller; the roller 2 has a deformable surface; at the outlet of the grip of these rollers 1 and 2, the strip coated on both sides then scrolls in conventional ways 8 post-heating, then undergoes a conventional quenching; the post-heating conditions in these means 8 and the quenching conditions are adapted to obtain the desired coating structure.
  • the device illustrated in FIG. 10 therefore comprises: a first coating station between the rollers 1 "and 2" where the roller 1 "is used for preheating and postheating the strip,
  • rollers 1 and 2 a second coating station between the rollers 1 and 2, where the roller 1 is not used for post-heating the strip although it is on a hard surface and is used for preheating, because the coated strip does not remain in contact with it. roller beyond the coating application line, leaving the area between the rollers 1, 2.
  • the device illustrated in FIG. 11 also comprises two coating stations between two calendering rollers 1 ", 1 '" and 2 ", 2" "to also obtain a strip coated with polymer on each face; for each station, the support roller 1 ", the” is metallic with a hard surface and the moving strip embraces this roller both before and after the line of application of the polymer P, P "which corresponds to the line footprint between the rollers; for each station, the application roller 2 ", 2 '” has a deformable surface; to avoid the risks of sticking of the polymer P on the support roller 1' "of the second station, this support roll 1 '”is coated with a thin non-stick layer 9, for example based on Teflon TM.
  • This non-stick layer may be metallic, for example of amorphous or quasi-crystalline structure of the type that is obtained by hyperhardening. Contrary to FIG. 10, after the first coating station, the strip coated on one side is directly drawn towards the second station for coating on the other side: between the two stations, no cooling roller, no deflector roller.
  • the strip Before, during and after application of the polymer P "on the second face, the strip remains in contact with the roller 1" provided with a non-stick layer 9 by means of the coating previously applied to the first face; as before, this 1 "support roller is adapted in surface and temperature; the contact of the strip with this roll “after application can be extended over a quarter of the circumference of the roll, as shown, or even up to half the circumference, so as to prolong the heat transfer in order to ensure the post-heating required.
  • heat transfer is slowed down by a non-stick layer
  • a roll 1 '"of larger diameter so as to lengthen the contact time between the strip and the roll and to prolong the heat transfer.
  • quenching begins here as soon as the strip loses contact with the support roller 1 '" of the second station.
  • Other conventional quenching methods can replace roll quenching, such as water quenching.
  • the device and the method according to the invention have been advantageously used for the preparation of steel strips for packaging coated with polyethylene or polypropylene films.
  • These coatings have the following advantages: absence of solvent in the manufacturing steps, good surface appearance and good printing capacities of the faces coated with these sheets, improved organoleptic qualities.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Coating Apparatus (AREA)

Abstract

The invention concerns a method comprising steps which consist in: continuously unwinding said strip on a heated dead roll (1'') with a non-deformable metal surface; applying the polymer composition (P) on one of the surfaces (Be) of the strip supported on said roll; before, during and after application, heating the strip by contacting the other face (Bi) with said roll (1''). The invention also concerns an associated device for one-surface or two-surface coating. When the application is carried out between two rolls, the other roll (2'') has a deformable surface. The invention provides better adherence for the coating.

Description

Procédé et dispositif de revêtement en continu d'une bande métallique par une composition polymère Method and device for continuously coating a metal strip with a polymer composition
L'invention concerne un procédé et un dispositif de revêtement en continu d'une bande métallique par une composition polymère. Une bande métallique présente deux faces : on appellera la face à revêtir : « face externe » , et la face opposée : « face interne ».The invention relates to a method and a device for continuously coating a metal strip with a polymer composition. A metal strip has two faces: we will call the face to be coated: "external face", and the opposite face: "internal face".
D'une manière classique, et en référence à la figure 1 , un dispositif de revêtement comprend :In a conventional manner, and with reference to FIG. 1, a coating device comprises:
- des moyens d'application de composition polymère, comprenant un rouleau d'appui 1 et des moyens 3 pour appliquer une couche de cette composition sur la face externe Be de la bande.means for applying a polymer composition, comprising a support roller 1 and means 3 for applying a layer of this composition to the external face Be of the strip.
- des moyens de défilement en continu de la bande, adaptés pour la faire défiler sur le rouleau d'appui 1 de manière à ce que sa face interne Bi soit en contact avec la surface de ce rouleau. Comme moyen d'application de la couche, on peut utiliser par exemple des moyens d'extrusion directe de la couche polymère sur la bande ; les moyens d'extrusion servent alors aussi à former la couche ; lorsqu'on utilise ce moyen d'application, on utilise alors une composition polymère exempte de solvant et le polymère est alors appliqué à l'état fondu. Comme moyen d'application d'une couche polymère à l'état fondu, on peut également utiliser un dispositif comprenant deux rouleaux en appui l'un contre l'autre entre lesquels défile la bande à revêtir comme illustré aux figures 2 et 3 : outre le rouleau d'appui 1 , on trouve alors un rouleau d'application 2 ; pendant l'application, c'est la face externe Be de la bande et le revêtement lui- même qui viennent au contact du rouleau d'application 2.- Continuous scrolling means of the strip, adapted to scroll it on the support roller 1 so that its internal face Bi is in contact with the surface of this roller. As a means of applying the layer, it is possible to use, for example, means for direct extrusion of the polymer layer onto the strip; the extrusion means then also serve to form the layer; when this application means is used, a solvent-free polymer composition is then used and the polymer is then applied in the molten state. As a means of applying a polymer layer in the molten state, it is also possible to use a device comprising two rollers bearing against one another, between which the strip to be coated runs as illustrated in FIGS. 2 and 3: in addition the support roller 1, there is then an application roller 2; during application, it is the external face Be of the strip and the coating itself which come into contact with the application roller 2.
Comme illustré à la figure 2, ce moyen d'application à deux rouleaux 1 et 2 en appui indirect l'un contre l'autre peut servir à appliquer le polymère par calandrage: les deux rouleaux tournent alors en sens contraire et la composition polymère P à appliquer est introduite entre la bande B et le rouleau d'application 2.As illustrated in FIG. 2, this application means with two rollers 1 and 2 in indirect support against each other can be used to apply the polymer by calendering: the two rollers then rotate in opposite directions and the polymer composition P to be applied is introduced between the strip B and the application roller 2.
Comme illustré à la figure 3, ce moyen d'application peut également servir dans le cas où l'on forme une nappe polymère N sur le rouleau d'application 2, par exemple à l'aide des moyens 3 et où cette nappe N est ensuite transférée du rouleau d'application 2 sur la bande B : les deux rouleaux peuvent alors tourner dans le même sens comme indiqué sur la figure 3.As illustrated in FIG. 3, this means of application can also be used in the case where a polymeric sheet N is formed on the roll. application 2, for example using the means 3 and where this sheet N is then transferred from the application roller 2 to the strip B: the two rollers can then rotate in the same direction as indicated in FIG. 3.
Lorsqu'on procède par calandrage (figure 2), le rouleau d'application 2 utilisé est en général à surface dure, non deformable ; il s'agit par exemple de rouleaux métalliques ; on limite ainsi les risques de collage de composition polymère sur les rouleaux.When proceeding by calendering (FIG. 2), the application roller 2 used is generally with a hard surface, non-deformable; these are for example metallic rollers; this limits the risk of sticking of polymer composition on the rollers.
En effet, pendant et après application, la composition polymère n'entre en contact direct qu'avec le rouleau d'application, et c'est donc là uniquement que risquent d'apparaître des problèmes de collage : le choix d'une surface dure et de préférence refroidie permet de limiter ces risques.Indeed, during and after application, the polymer composition comes into direct contact only with the application roller, and it is therefore only there that risk of bonding problems appear: the choice of a hard surface and preferably cooled limits these risks.
Avant application de la couche de composition polymère sur la bande, on préchauffe souvent la bande à revêtir, notamment pour améliorer l'adhérence de cette couche au métal ; cette disposition est particulièrement utile dans le cas de compositions polymères à base de polyoléfines, qui sont apolaires et adhèrent donc moins facilement sur des matériaux polaires comme le métal.Before applying the layer of polymer composition to the strip, the strip to be coated is often preheated, in particular to improve the adhesion of this layer to the metal; this arrangement is particularly useful in the case of polymer compositions based on polyolefins, which are apolar and therefore adhere less easily to polar materials such as metal.
Pour le préchauffage, si le rouleau d'appui est doté de moyens de chauffage, il suffit alors, avant application de la couche polymère, de faire défiler la bande sur le rouleau d'appui chauffé en maintenant la face interne de la bande en contact avec la surface chaude de ce rouleau : la bande est ainsi préchauffée à la température du rouleau pendant l'intervalle de temps de défilement sur ce rouleau.For preheating, if the backing roller is provided with heating means, it suffices then, before application of the polymer layer, to run the strip over the heated backing roller while maintaining the internal face of the strip in contact with the hot surface of this roller: the strip is thus preheated to the temperature of the roller during the interval of travel time on this roller.
Dans ce cas, lorsqu'on utilise des moyens d'application comportant un rouleau d'appui 1 et un rouleau d'application 2 en appui indirect contre le rouleau d'appui comme précédemment décrit (figure 2), le rouleau d'appui 1 est en général à surface deformable, par exemple en caoutchouc, le rouleau d'application 2 étant en général à surface non deformable, par exemple métallique, pour limiter les risques de collage (voir ci-dessus). Dans le cas de l'application de compositions polymères thermoplastiques, on souhaite parfois obtenir des revêtements de structure amorphe ou de faible cristallinité ; il importe alors d'effectuer une opération de trempe après application de la couche sur la bande ; pour être efficace, la trempe, ou refroidissement rapide, doit être réalisée le plus rapidement possible après application.In this case, when using application means comprising a support roller 1 and an application roller 2 in indirect support against the support roller as previously described (FIG. 2), the support roller 1 is generally with a deformable surface, for example rubber, the application roller 2 being generally with a non-deformable surface, for example metallic, to limit the risks of sticking (see above). In the case of the application of thermoplastic polymer compositions, it is sometimes desired to obtain coatings of amorphous structure or of low crystallinity; it is therefore important to carry out an operation of quenching after application of the layer on the strip; to be effective, quenching, or rapid cooling, must be carried out as quickly as possible after application.
En référence à la figure 4, pour pouvoir utiliser le dispositif précédemment décrit (par exemple selon la figure 2) comportant un rouleau d'appui à surface deformable et un rouleau d'application à surface non deformable, on chauffe alors le rouleau d'appui 1 ' et on refroidit le rouleau d'application 2' ; pour le revêtement, on fait alors défiler la bande sur le rouleau d'appui chauffé 1 ', puis entre les rouleaux 1 ' et 2' pour l'application de la couche polymère, et enfin sur le rouleau d'application 2' qui est refroidi ; le défilement du point E au point C sur le rouleau d'appui 1 ' chauffé sert donc de préchauffage et le défilement du point C au point S sur le rouleau d'application 2' refroidi sert donc à la trempe. Selon ce procédé : - le rouleau d'appui l' est donc chauffé et maintenu en contact avec la face interne Bi de la bande uniquement avant application,With reference to FIG. 4, in order to be able to use the device described above (for example according to FIG. 2) comprising a support roller with deformable surface and an application roller with non-deformable surface, the support roller is then heated 1 'and the application roller 2' is cooled; for the coating, the strip is then passed over the heated support roller 1 ', then between the rollers 1' and 2 'for applying the polymer layer, and finally on the application roller 2' which is cooled ; scrolling from point E to point C on the heated backing roller 1 ′ therefore serves for preheating and scrolling from point C to point S on the cooled application roller 2 ′ therefore serves for quenching. According to this process: the support roller 1 is therefore heated and kept in contact with the internal face Bi of the strip only before application,
- la composition polymère est appliquée à l'état fondu sur la face externe Be de la bande à l'aide de moyens classiques d'application,the polymer composition is applied in the molten state to the external face Be of the strip using conventional means of application,
- le rouleau d'application 2' est donc refroidi et maintenu en contact avec la face externe Be de la bande uniquement après application.the application roller 2 ′ is therefore cooled and kept in contact with the external face Be of the strip only after application.
Selon ce procédé, la trempe commence immédiatement après application de la couche polymère ; comme le refroidissement intervient trop rapidement après application de la couche polymère, on n'obtient pas une bonne adhérence sur la bande métallique. Pour augmenter l'adhérence, il convient alors d'intercaler, entre le métal et la couche de revêtement, une couche intercalaire de couplage ; mais cette méthode se révèle très coûteuse, puisqu'il s'agit en réalité de revêtements « bi- couches » nécessitant généralement deux étapes successives de revêtement ; malgré cette couche de couplage, l'adhérence en sortie du rouleau froid 2' reste souvent insuffisante, et il convient de réchauffer la bande métallique revêtue de manière à augmenter l'adhérence du revêtement, ce qui est encore plus pénalisant du point de vue économique. L'invention a pour but d'offrir un procédé permettant d'obtenir des revêtements à la fois amorphes ou de faible cristallinité et adhérents, en une seule étape de revêtement ; l'invention a également pour but d'offrir un procédé beaucoup plus économique. A cet effet, l'invention a pour objet un procédé de revêtement en continu d'une bande métallique par une composition polymère, ladite bande présentant une face dite « externe » à revêtir et une face opposée dite « interne », caractérisé en ce qu'il comprend les étapes consistant à :According to this process, the quenching begins immediately after application of the polymer layer; as cooling occurs too quickly after application of the polymer layer, good adhesion to the metal strip is not obtained. To increase adhesion, it is then necessary to interpose, between the metal and the coating layer, an intermediate coupling layer; but this method proves to be very expensive, since it is in reality “two-layer” coatings generally requiring two successive stages of coating; despite this coupling layer, the adhesion at the outlet of the cold roller 2 ′ often remains insufficient, and the coated metal strip should be heated so as to increase the adhesion of the coating, which is even more disadvantageous from the economic point of view . The object of the invention is to offer a process making it possible to obtain coatings which are both amorphous or of low crystallinity and adherent, in a single coating step; the invention also aims to offer a much more economical process. To this end, the subject of the invention is a process for continuously coating a metal strip with a polymer composition, said strip having a so-called “external” face to be coated and an opposite face called “internal”, characterized in that '' it includes the steps of:
- mettre ladite bande en défilement continu sur un rouleau d'appui chauffé à surface métallique non deformable,- putting said strip in continuous travel on a heated support roller with a non-deformable metal surface,
- appliquer ladite composition polymère sur la face externe de la bande, à l'aide de moyens d'application comprenant ledit rouleau d'appui,applying said polymer composition to the external face of the strip, using application means comprising said support roller,
- avant, pendant et après application, chauffer ladite bande par contact de sa face interne avec ledit rouleau d'appui. Les avantages de l'invention résident principalement dans les éléments suivants :- Before, during and after application, heat said strip by contacting its internal face with said support roller. The advantages of the invention lie mainly in the following elements:
- comme le rouleau d'appui chauffant présente une surface métallique, on améliore l'efficacité, l'homogénéité et le contrôle du chauffage de la bande, ce qui contribue à l'amélioration de l'adhérence du revêtement ; - comme la bande reste en contact avec le rouleau d'appui chauffant après application du polymère de revêtement de manière à assurer un « post chauffage » de la bande, on améliore sensiblement l'adhérence du revêtement. D'autres caractéristiques avantageuses du procédé selon l'invention sont définies dans les revendications dépendantes. Ainsi, selon une caractéristique additionnelle de l'invention, on applique la composition polymère par calandrage entre un rouleau d'application à surface deformable et la bande en appui sur ledit rouleau d'appui ; la surface du rouleau d'application est donc plus deformable que celle du rouleau d'appui et peut ainsi avantageusement épouser les aspérités et la rugosité de la surface de bande à revêtir.- As the heated backing roller has a metallic surface, the efficiency, the homogeneity and the control of the heating of the strip are improved, which contributes to the improvement of the adhesion of the coating; - As the strip remains in contact with the heating backing roller after application of the coating polymer so as to ensure a “post-heating” of the strip, the adhesion of the coating is substantially improved. Other advantageous characteristics of the method according to the invention are defined in the dependent claims. Thus, according to an additional characteristic of the invention, the polymer composition is applied by calendering between an application roller with a deformable surface and the strip bearing on said support roller; the surface of the application roller is therefore more deformable than that of the support roller and can thus advantageously match the roughness and roughness of the strip surface to be coated.
L'invention a également pour objet un dispositif pour mettre en œuvre le procédé selon l'invention, de revêtement d'une bande métallique présentant une face externe à revêtir et une face opposée dite interne, comprenant :The invention also relates to a device for implementing the method according to the invention, for coating a metal strip having an external face to be coated and an opposite face called internal, comprising:
- des moyens d'application d'une couche de composition polymère sur la face externe de la bande, comprenant un rouleau d'appui doté de moyens de chauffage, - des moyens de défilement en continu de la bande définissant un chemin de défilement de la bande dans ledit dispositif, caractérisé en ce que :- means for applying a layer of polymer composition on the external face of the strip, comprising a support roller provided with heating means, - means for continuously running the strip defining a running path of the strip in said device, characterized in that:
- ledit rouleau d'appui est à surface métallique non deformable,said support roller has a non-deformable metal surface,
- lesdits moyens de défilement sont adaptés pour faire défiler la bande sur ledit rouleau d'appui en maintenant sa face interne en contact avec la surface de ce rouleau avant, pendant et après application de ladite couche.- Said running means are adapted to run the strip on said support roller while maintaining its internal face in contact with the surface of this roller before, during and after application of said layer.
D'autres caractéristiques avantageuses du dispositif selon l'invention sont définies dans les revendications dépendantes.Other advantageous characteristics of the device according to the invention are defined in the dependent claims.
Ainsi, selon une caractéristique additionnelle de l'invention, le dispositif comprend deux postes de revêtement successifs, l'un pour le revêtement de la face externe comme précédemment décrit, et l'autre pour le revêtement de la face interne.Thus, according to an additional characteristic of the invention, the device comprises two successive coating stations, one for coating the external face as previously described, and the other for coating the internal face.
Le poste de revêtement de la face interne peut présenter les mêmes caractéristiques que celui de la face externe. L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée à titre d'exemple non limitatif, et en référence aux figures annexées sur lesquelles :The coating station of the internal face can have the same characteristics as that of the external face. The invention will be better understood on reading the description which follows, given by way of nonlimiting example, and with reference to the appended figures in which:
- les figures 1 à 4 représentent des dispositifs et des procédés de revêtement de l'art antérieur : la figure 1 pour un cas général d'application sur une bande défilant sur un rouleau d'appui, les figures 2 à 4 dans le cas de l'application sur la bande par un rouleau d'application en appui sur le rouleau d'appui, la figure 4 dans le cas d'un refroidissement rapide après application, pour obtenir un revêtement amorphe ou partiellement cristallin.- Figures 1 to 4 show devices and methods of coating the prior art: Figure 1 for a general case of application on a strip running on a support roller, Figures 2 to 4 in the case of application to the strip by an application roller bearing on the support roller, FIG. 4 in the case of rapid cooling after application, to obtain an amorphous or partially crystalline coating.
- les figures 5 à 11 représentent divers modes de réalisation de l'invention qui diffèrent entre eux par le mode d'application du polymère et/ou par le traitement de la bande après passage sur le rouleau d'appui et/ou par une application monoface ou biface : - application par extrusion au contact de la bande appuyée sur le rouleau d'appui : figures 5, 6 et 7 ; application par calandrage d'un film ou d'une nappe fondue entre le rouleau d'appui et un rouleau d'application : figures 8 à 11. - refroidissement de la bande sur au moins un rouleau de refroidissement, après application : figures 5, 6, 8, 9 pour la première face, 11 pour la deuxième face.- Figures 5 to 11 show various embodiments of the invention which differ from each other by the mode of application of the polymer and / or by the treatment of the strip after passing over the support roller and / or by an application single or double sided: - Application by extrusion in contact with the strip supported on the support roller: Figures 5, 6 and 7; application by calendering of a film or of a melted sheet between the support roller and an application roller: FIGS. 8 to 11. - cooling of the strip on at least one cooling roller, after application: FIGS. 5, 6, 8, 9 for the first side, 11 for the second side.
- la figure 9 décrit un moyen particulier de refroidissement de la surface du rouleau d'application à l'aide d'une jupe métallique souple J, elle-même refroidie par ailleurs.- Figure 9 describes a particular means of cooling the surface of the application roller using a flexible metal skirt J, itself otherwise cooled.
- application bi-face : figures 10 et 11.- two-sided application: Figures 10 and 11.
En référence à la figure 5, le dispositif pour mettre en œuvre le procédé selon l'invention, de revêtement d'une bande métallique B présentant une face « externe » à revêtir Be et une face opposée dite « interne » Bi, comprend : - des moyens d'application d'une composition polymère, comprenant :With reference to FIG. 5, the device for implementing the method according to the invention, for coating a metal strip B having an "external" face to be coated Be and an opposite face called "internal" Bi, comprises: - means for applying a polymer composition, comprising:
- un rouleau d'appui 1" à surface métallique non deformable, doté de moyens de chauffage, eta 1 "support roller with a non-deformable metal surface, provided with heating means, and
- des moyens 3 pour appliquer une couche de cette composition à l'état fondu sur la face externe Be de la bande. - des moyens de défilement en continu de la bande comprenant :- Means 3 for applying a layer of this composition in the molten state to the outer face Be of the strip. means for continuously scrolling the strip comprising:
- le rouleau d'appui 1",- the 1 "backing roller,
- un rouleau de refroidissement 4 doté de moyens de refroidissement. Les moyens 3 sont adaptés pour appliquer une couche polymère- à l'état fondu ; ces moyens sont connus en eux-mêmes et ne seront pas décrits ici en détail ; ces moyens 3 comprennent par exemple des moyens d'extrusion, et/ou des moyens de calandrage, et/ou des moyens de transfert de nappe polymère. Pour mettre en œuvre le procédé selon l'invention, pendant que l'on chauffe le rouleau d'appui 1 " et qu'on refroidit le rouleau 4, on fait défiler la bande B sur le rouleau 1" puis sur le rouleau 4, et pendant le défilement sur le rouleau 1 ", à l'aide des moyens 3 d'application de couche, on applique en C une couche de composition polymère sur la bande. Au cours de son défilement, la bande rentre en contact avec le rouleau d'appui 1 " sur la ligne E et quitte le contact de ce rouleau sur la ligne P ; la ligne P est située sur la circonférence du rouleau bien après la ligne C dans le sens du défilement ou de rotation. Au cours de la mise en œuvre du procédé, la bande est donc préchauffée sur le rouleau 1 " entre les lignes E et C, puis revêtue dans la zone C, puis immédiatement « post-chauffée » sur le même rouleau entre les lignes C et P, et enfin refroidie par passage sur le rouleau de refroidissement 4 entre les lignes R et G. Dans la configuration décrite sur la figure 5, la couche polymère, appliquée sur la face Be de la bande vient en contact direct avec la surface du rouleau 4 ; cette disposition peut présenter des inconvénients, par exemple des risques d'endommagement du revêtement de la bande.a cooling roller 4 provided with cooling means. The means 3 are suitable for applying a polymer layer in the molten state; these means are known in themselves and will not be described here in detail; these means 3 comprise for example extrusion means, and / or calendering means, and / or means for transferring the polymer sheet. To implement the method according to the invention, while the support roller 1 "is being heated and the roller 4 is being cooled, the strip B is passed over the roller 1" then on the roller 4, and during the scrolling on the roller 1 ", using the layer application means 3, a layer of polymer composition is applied at C on the strip. During its running, the strip comes into contact with the support roller 1 "on line E and leaves the contact of this roller on line P; line P is located on the circumference of the roller well after line C in the direction of travel or rotation. During the implementation of the process, the strip is therefore preheated on the roll 1 "between lines E and C, then coated in zone C, then immediately" post-heated " on the same roller between lines C and P, and finally cooled by passing over the cooling roller 4 between lines R and G. In the configuration described in FIG. 5, the polymer layer, applied to the Be side of the strip comes into direct contact with the surface of the roller 4; this arrangement can have drawbacks, for example risks of damage to the coating of the strip.
Pour éviter cet inconvénient, on peut utiliser une autre configuration telle que celle décrite à la figure 6 où le défilement sur le rouleau de refroidissement 4' est différent et adapté pour éviter que la face revêtue Be de la bande ne rentre en contact direct avec le rouleau.To avoid this drawback, another configuration such as that described in FIG. 6 can be used where the travel on the cooling roller 4 'is different and adapted to prevent the coated face Be of the strip from coming into direct contact with the roller.
Toujours en référence à la figure 6, on a disposé des moyens d'arrosage 5 de la face revêtue Be de la bande, entre le rouleau d'appui 1 " et le rouleau de refroidissement 4' ; ces moyens complémentaires de refroidissement permettent d'améliorer l'efficacité du refroidissement.Still with reference to FIG. 6, sprinkling means 5 have been arranged on the coated face Be of the strip, between the support roller 1 "and the cooling roller 4 '; these complementary cooling means make it possible to improve cooling efficiency.
La température du rouleau 1 " et la longueur de défilement entre les lignes E et C définissent les conditions de préchauffage.The temperature of the 1 "roller and the length of travel between lines E and C define the preheating conditions.
La température du rouleau 1 " et la longueur de défilement entre les lignes C et P définissent les conditions de postchauffage.The temperature of the 1 "roller and the length of travel between lines C and P define the post-heating conditions.
La température du rouleau 4 et 4', la longueur de défilement entre les lignes R et G, ainsi que, le cas échéant, les moyens complémentaires de refroidissement comme les moyens d'arrosage 5, définissent les conditions de refroidissement. Grâce au dispositif et au procédé selon l'invention, on peut réaliser une opération de postchauffage d'une manière très économique juste après l'application de la couche polymère, par maintien de la bande revêtue au contact avec le rouleau d'appui 1" ; cette opération est destinée à améliorer l'adhérence de la couche sur la bande.The temperature of the roller 4 and 4 ′, the length of travel between the lines R and G, as well as, where appropriate, the additional cooling means such as the sprinkling means 5, define the cooling conditions. Thanks to the device and method according to the invention, it is possible to carry out a post-heating operation in a very economical manner just after the application of the polymer layer, by maintaining the coated strip at the contact with the 1 "backing roller; this operation is intended to improve the adhesion of the layer to the strip.
Grâce à la surface métallique du rouleau d'appui 1 ", on obtient un très bon transfert thermique entre le rouleau et la bande, ce qui permet de mieux maîtriser les conditions de préchauffage et de postchauffage.Thanks to the metal surface of the 1 "backing roller, very good heat transfer is obtained between the roller and the strip, which allows better control of the preheating and postheating conditions.
Selon une variante de l'invention, et selon la nature de la composition polymère à déposer et la vitesse de défilement de la bande, la bande métallique a déjà subi un premier préchauffage avant de défiler sur le rouleau d'appui 1 " ; le dispositif pour mettre en œuvre le procédé selon l'invention comprend alors des moyens de préchauffage additionnels implantés en amont des moyens d'application ; on utilise des moyens de préchauffage classiques, par exemple par induction ou par rayonnement infrarouge.According to a variant of the invention, and depending on the nature of the polymer composition to be deposited and the speed of travel of the strip, the metal strip has already undergone a first preheating before traveling on the support roller 1 "; the device to implement the method according to the invention then comprises additional preheating means located upstream of the application means; conventional preheating means are used, for example by induction or by infrared radiation.
Selon une autre variante de l'invention, et selon la nature de la composition polymère et la microstructure du revêtement visée, la bande métallique revêtue est réchauffée après avoir défilé sur le rouleau d'appui 1 " ; le dispositif pour mettre en œuvre le procédé selon l'invention comprend alors des moyens de postchauffage additionnels implantés en aval des moyens d'application, par exemple à la place des moyens 5 de refroidissement de la figure 6. A l'inverse, quand on souhaite refroidir par trempe la bande revêtue immédiatement après le postchauffage sur le rouleau d'appui, le rouleau 4 de refroidissement est implanté au plus près du rouleau d'appui 1 " au point que la distance PR est nulle ou quasi nulle (variante de la figure 5).According to another variant of the invention, and according to the nature of the polymer composition and the microstructure of the intended coating, the coated metal strip is reheated after having passed over the 1 "support roller; the device for implementing the method according to the invention then comprises additional post-heating means installed downstream of the application means, for example in place of the cooling means 5 of FIG. 6. Conversely, when it is desired to cool the coated strip immediately by quenching after the post-heating on the support roller, the cooling roller 4 is installed as close as possible to the support roller 1 "to the point that the distance PR is zero or almost zero (variant of FIG. 5).
En se référant à la figure 7, lorsqu'on utilise une composition polymère thermodurcissable, le rouleau 4 est remplacé avantageusement par un dispositif de chauffage 6 adapté pour la cuisson de ce polymère.Referring to FIG. 7, when a thermosetting polymer composition is used, the roller 4 is advantageously replaced by a heating device 6 suitable for baking this polymer.
Lorsqu'on utilise une composition polymère thermoplastique et qu'on souhaite obtenir un revêtement présentant une structure fortement amorphe, les moyens de refroidissement, principaux comme les rouleaux 4 ou 4', ou complémentaires comme les moyens d'arrosage 5, sont adaptés d'une manière connue en elle-même pour obtenir une trempe rapide apte à former un revêtement présentant une structure fortement amorphe. Grâce à l'invention, on obtient alors, d'une manière très économique, un revêtement à la fois fortement amorphe grâce à la trempe et fortement adhérent grâce au postchauffage, dans des conditions facilement contrôlables. Dans le cas où on applique la couche de composition polymère entre deux rouleaux entre lesquels défile la bande, notamment lorsqu'on applique cette couche par calandrage (de film ou de nappe) ou par transfert (de nappe polymère), outre le rouleau d'appui à surface métallique non deformable, on utilise alors, en appui contre ce rouleau d'appui, un rouleau d'application à surface deformable. Selon l'invention, l'utilisation d'un rouleau d'application à surface deformable est possible parce que le rouleau d'appui est à surface non deformable ; l'utilisation d'un rouleau d'application à surface deformable permet d'appliquer le revêtement polymère d'une manière très homogène sur la bande métallique, d'assurer un contact très homogène entre le revêtement et la bande en tous points de cette bande quelles que soient ses aspérités et sa rugosité, et d'éviter d'emprisonner des bulles d'air entre la bande et le revêtement.When a thermoplastic polymer composition is used and it is desired to obtain a coating having a highly amorphous structure, the cooling means, main like the rollers 4 or 4 ′, or complementary like the sprinkling means 5, are adapted to a manner known in itself for obtaining rapid quenching capable of forming a coating having a strongly amorphous structure. Thanks to the invention, there is then obtained, in a very economical manner, a coating which is both highly amorphous thanks to the quenching and strongly adherent thanks to the post-heating, under easily controllable conditions. In the case where the layer of polymer composition is applied between two rollers between which the strip passes, in particular when this layer is applied by calendering (of film or of ply) or by transfer (of polymer ply), in addition to the roll of support with a non-deformable metal surface, an application roller with a deformable surface is then used, in support against this support roller. According to the invention, the use of an application roller with a deformable surface is possible because the support roller has a non-deformable surface; the use of an application roller with deformable surface makes it possible to apply the polymer coating in a very homogeneous manner on the metal strip, to ensure a very homogeneous contact between the coating and the strip at all points of this strip whatever its roughness and roughness, and to avoid trapping air bubbles between the strip and the coating.
On entend par surface deformable une surface susceptible de se déformer de manière à épouser les reliefs de rugosité de la bande dans les conditions d'appui du rouleau d'application sur le rouleau d'appui ; comme exemple de rouleau à surface deformable, on peut utiliser des rouleaux à surface deformable en caoutchouc.The expression “deformable surface” is understood to mean a surface capable of deforming so as to match the roughness reliefs of the strip under the conditions of support of the application roller on the support roller; as an example of a roller with a deformable surface, rollers with a deformable rubber surface can be used.
Qu'on utilise donc le calandrage ou le transfert, une différence importante avec l'art antérieur est que le rouleau d'application est à surface deformable et que, après application du polymère sur la bande, cette bande n'est pas maintenue en contact par sa face externe revêtue sur ce rouleau puisqu'elle est au contraire maintenue en contact avec le rouleau d'appui par sa face interne ; cette caractéristique de défilement de la bande après application du polymère permet de limiter les risques de collage du revêtement sur le rouleau d'application ; en complément, pour limiter encore ces risques de collage, il convient d'assurer un refroidissement adapté de la surface du rouleau d'application. Les figures 8 à 11 illustrent des variantes de ce procédé et de ce dispositif d'application entre rouleaux.Whether using calendering or transfer, an important difference from the prior art is that the application roller has a deformable surface and that, after application of the polymer to the strip, this strip is not kept in contact. by its outer face coated on this roller since it is on the contrary maintained in contact with the support roller by its inner face; this running characteristic of the strip after application of the polymer makes it possible to limit the risks of sticking of the coating on the application roller; in addition, to further limit these risks of sticking, it is necessary to ensure suitable cooling of the surface of the application roller. Figures 8 to 11 illustrate variants of this method and of this application device between rollers.
La figure 8 est semblable à la figure 5, à la différence près que la composition polymère P est appliquée par calandrage d'un film ou d'une nappe fondue de polymère entre le rouleau d'application 2" et le rouleau d'appui 1".FIG. 8 is similar to FIG. 5, with the difference that the polymer composition P is applied by calendering a film or a melted sheet of polymer between the application roller 2 "and the support roller 1 ".
Comme indiqué précédemment, pour limiter les risques de collage de composition polymère sur le rouleau d'application 2", le dispositif comporte de préférence des moyens de refroidissement du rouleau d'application.As indicated above, to limit the risks of sticking of polymer composition on the 2 "application roller, the device preferably comprises means for cooling the application roller.
Comme la surface du rouleau d'application est deformable, la surface de ce rouleau est généralement en matériau thermiquement peu conducteur et il est avantageux de refroidir directement la surface du rouleau : la figure 9 illustre un moyen de refroidissement direct de la surface de ce rouleau.As the surface of the application roller is deformable, the surface of this roller is generally made of thermally non-conductive material and it is advantageous to directly cool the surface of the roller: FIG. 9 illustrates a means of direct cooling of the surface of this roller .
La figure 9 est semblable à la figure 8, à la différence près qu'on fait en outre défiler autour du rouleau d'application 2" une jupe métallique souple de refroidissement J, cette jupe J se refroidissant elle-même en défilant au contact d'un rouleau de refroidissement de jupe 7.FIG. 9 is similar to FIG. 8, with the difference that a flexible metallic skirt J for cooling is further scrolled around the application roller 2 ", this skirt J cooling itself by scrolling on contact d '' a skirt cooling roller 7.
L'avantage de cette variante est d'assurer un refroidissement très efficace de la surface du rouleau d'application 2".The advantage of this variant is to ensure very effective cooling of the surface of the 2 "application roller.
Il convient cependant de limiter le refroidissement du rouleau d'application 2" de manière à conserver une élasticité suffisante de sa surface deformable.However, the cooling of the 2 "application roller should be limited so as to maintain sufficient elasticity of its deformable surface.
La figure 10 illustre un dispositif selon l'invention pour revêtement bi- couche ; l'application de la première couche de polymère P sur la première face de la bande B est réalisée à l'identique de la figure 8, avec, ici, un rouleau de refroidissement 4 très proche du rouleau d'appui 1 " pour obtenir une trempe immédiate du revêtement ; en sortie de trempe, la bande revêtue sur une face est ensuite déviée par un rouleau déflecteur 10 afin de présenter son autre face à l'enduction par un polymère P" entre deux rouleaux 1 et 2, d'une manière analogue à celle illustrée à la figure 2 ; on adapte la surface et la température du rouleau 1 au polymère P" qui vient en contact avec ce rouleau ; le rouleau 2 est à surface deformable ; en sortie de l'emprise de ces rouleaux 1 et 2, la bande revêtue sur les deux faces défile ensuite dans des moyens classiques de postchauffage 8, puis subit une trempe classique ; les conditions de postchauffage dans ces moyens 8 et les conditions de trempe sont adaptées pour obtenir la structure de revêtement recherchée.FIG. 10 illustrates a device according to the invention for two-layer coating; the application of the first layer of polymer P on the first face of the strip B is carried out in the same way as in FIG. 8, with here a cooling roller 4 very close to the support roller 1 "to obtain a immediate hardening of the coating; at the end of the hardening, the strip coated on one side is then deflected by a deflector roller 10 so as to present its other face to the coating with a polymer P "between two rollers 1 and 2, in a manner similar to that illustrated in Figure 2; the surface and the temperature of the roller 1 are adapted to the polymer P "which comes into contact with this roller; the roller 2 has a deformable surface; at the outlet of the grip of these rollers 1 and 2, the strip coated on both sides then scrolls in conventional ways 8 post-heating, then undergoes a conventional quenching; the post-heating conditions in these means 8 and the quenching conditions are adapted to obtain the desired coating structure.
Le dispositif illustré à la figure 10 comporte donc : - un premier poste de revêtement entre les rouleaux 1 " et 2" où le rouleau 1 " sert au préchauffage et au postchauffage de la bande,The device illustrated in FIG. 10 therefore comprises: a first coating station between the rollers 1 "and 2" where the roller 1 "is used for preheating and postheating the strip,
- et un deuxième poste de revêtement entre les rouleaux 1 et 2, où le rouleau 1 ne sert pas au postchauffage de la bande bien qu'il soit à surface dure et serve au préchauffage, car la bande revêtue ne reste pas au contact de ce rouleau au delà de la ligne d'application du revêtement, en sortant de l'emprise entre les rouleaux 1 , 2.- And a second coating station between the rollers 1 and 2, where the roller 1 is not used for post-heating the strip although it is on a hard surface and is used for preheating, because the coated strip does not remain in contact with it. roller beyond the coating application line, leaving the area between the rollers 1, 2.
Le dispositif illustré à la figure 11 comporte également deux postes de revêtement entre deux rouleaux de calandrage 1 ", 1 '" et 2", 2'" pour obtenir également une bande revêtue de polymère sur chaque face ; pour chaque poste, le rouleau d'appui 1 ", l'" est métallique à surface dure et la bande en défilement enlace ce rouleau à la fois avant et après la ligne d'application du polymère P, P" qui correspond à la ligne d'emprise entre les rouleaux ; pour chaque poste, le rouleau d'application 2", 2'" est à surface deformable ; pour éviter les risques de collage du polymère P sur le rouleau d'appui 1 '" du deuxième poste, ce rouleau d'appui 1 '" est revêtu d'une fine couche antiadhérente 9, par exemple à base de téflon™.The device illustrated in FIG. 11 also comprises two coating stations between two calendering rollers 1 ", 1 '" and 2 ", 2" "to also obtain a strip coated with polymer on each face; for each station, the support roller 1 ", the" is metallic with a hard surface and the moving strip embraces this roller both before and after the line of application of the polymer P, P "which corresponds to the line footprint between the rollers; for each station, the application roller 2 ", 2 '" has a deformable surface; to avoid the risks of sticking of the polymer P on the support roller 1' "of the second station, this support roll 1 '"is coated with a thin non-stick layer 9, for example based on Teflon ™.
Cette couche anti-adhérente peut être métallique, par exemple de structure amorphe ou quasi-cristalline du type de celle qu'on obtient par hypertrempe. A l'inverse de la figure 10, après le premier poste de revêtement, la bande revêtue sur une face est directement entraînée vers le deuxième poste pour revêtement de l'autre face : entre les deux postes, pas de rouleau de refroidissement, pas de rouleau déflecteur.This non-stick layer may be metallic, for example of amorphous or quasi-crystalline structure of the type that is obtained by hyperhardening. Contrary to FIG. 10, after the first coating station, the strip coated on one side is directly drawn towards the second station for coating on the other side: between the two stations, no cooling roller, no deflector roller.
Avant, pendant et après application du polymère P" sur la deuxième face, la bande reste en contact avec le rouleau l'" doté d'une couche antiadhérente 9 par l'intermédiaire du revêtement appliqué précédemment sur la première face ; comme précédemment, ce rouleau d'appui 1 " est adapté en surface et en température ; le contact de la bande avec ce rouleau l'" après application peut être prolongé sur un quart de la circonférence du rouleau, comme représenté, voire jusqu'à la moitié de la circonférence, de manière à prolonger le transfert thermique afin d'assurer le postchauffage requis. Lorsque le transfert thermique est ralenti par une couche anti-adhérenteBefore, during and after application of the polymer P "on the second face, the strip remains in contact with the roller 1" provided with a non-stick layer 9 by means of the coating previously applied to the first face; as before, this 1 "support roller is adapted in surface and temperature; the contact of the strip with this roll "after application can be extended over a quarter of the circumference of the roll, as shown, or even up to half the circumference, so as to prolong the heat transfer in order to ensure the post-heating required. When heat transfer is slowed down by a non-stick layer
9 organique et ou par le premier revêtement, on peut utiliser un rouleau 1 '" de diamètre plus important de manière à allonger la durée de contact entre la bande et le rouleau et à prolonger le transfert thermique.9 organic and or by the first coating, one can use a roll 1 '"of larger diameter so as to lengthen the contact time between the strip and the roll and to prolong the heat transfer.
La trempe de la bande revêtue sur les deux faces est ensuite assurée par passage de cette bande sur deux rouleaux de refroidissement successifs 4,The hardening of the strip coated on the two faces is then ensured by passing this strip over two successive cooling rollers 4,
4", disposés de manière à ce que les deux faces revêtues viennent alternativement en contact direct avec les deux rouleaux successifs ; la trempe commence ici dès que la bande perd le contact avec le rouleau d'appui 1 '" du deuxième poste. D'autres méthodes classiques de trempe peuvent remplacer la trempe sur rouleaux, comme une trempe à l'eau.4 ", arranged so that the two coated faces alternately come into direct contact with the two successive rollers; quenching begins here as soon as the strip loses contact with the support roller 1 '" of the second station. Other conventional quenching methods can replace roll quenching, such as water quenching.
Sans se départir de l'invention, pour le deuxième poste de revêtement, toutes les variantes et perfectionnements précédemment décrits dans le cas d'un revêtement mono-face sont applicables. On obtient une bande revêtue de polymère sur les deux faces.Without departing from the invention, for the second coating station, all the variants and improvements previously described in the case of a single-sided coating are applicable. A strip coated with polymer is obtained on both sides.
Le dispositif et le procédé selon l'invention ont été avantageusement utilisés pour la préparation de bandes d'acier pour emballage revêtues de films de polyéthylène ou de polypropylène.The device and the method according to the invention have been advantageously used for the preparation of steel strips for packaging coated with polyethylene or polypropylene films.
Ces revêtements présentent les avantages suivants : absence de solvant dans les étapes de fabrication, bon aspect de surface et bonnes capacités d'impression des faces revêtues de ces tôles, qualités organoleptiques améliorées.These coatings have the following advantages: absence of solvent in the manufacturing steps, good surface appearance and good printing capacities of the faces coated with these sheets, improved organoleptic qualities.
Grâce au procédé selon l'invention, on a pu obtenir des revêtements d'une part très adhérents à la tôle, en atmosphère sèche ou humide, même après stérilisation, d'autre part suffisamment amorphes pour être facilement déformables, notamment pour ne pas présenter de risques d'apparition de porosités après emboutissage. Thanks to the process according to the invention, it has been possible to obtain coatings on the one hand very adherent to the sheet, in a dry or humid atmosphere, even after sterilization, on the other hand sufficiently amorphous to be easily deformable, in particular so as not to have risks of the appearance of porosities after stamping.

Claims

REVENDICATIONS
1.- Procédé de revêtement en continu d'une bande métallique B par une composition polymère P, ladite bande présentant une face Be dite « externe » à revêtir et une face opposée Bi dite « interne », caractérisé en ce qu'il comprend les étapes consistant à :1.- Process for continuously coating a metal strip B with a polymer composition P, said strip having a face Be called "external" to be coated and an opposite face Bi called "internal", characterized in that it comprises the stages consisting of:
- mettre ladite bande B en défilement continu sur un rouleau d'appui (1 ") chauffé à surface métallique non deformable,- put said strip B in continuous movement on a heated support roller (1 ") with a non-deformable metal surface,
- appliquer ladite composition polymère P sur la face externe Be de la bande, à l'aide de moyens d'application comprenant ledit rouleau d'appui (1 "),- applying said polymer composition P to the external face Be of the strip, using application means comprising said support roller (1 "),
- avant, pendant et après application, chauffer ladite bande B par contact de sa face interne Bi avec ledit rouleau d'appui (1 ").- before, during and after application, heat said strip B by contact of its internal face Bi with said support roller (1 ").
2.- Procédé selon la revendication 1 caractérisé en ce que ladite bande métallique B est préchauffée avant de défiler sur ledit rouleau d'appui (1 ").2.- Method according to claim 1 characterized in that said metal strip B is preheated before running on said support roller (1 ").
3.- Procédé selon l'une quelconque des revendications 1 à 2 caractérisée en ce que ladite bande métallique B revêtue est postchauffée après avoir défilé sur ledit rouleau d'appui (1 ").3.- Method according to any one of claims 1 to 2 characterized in that said coated metal strip B is postheated after having passed over said support roller (1 ").
4.- Procédé selon l'une quelconque des revendications 1 à 3 caractérisé en ce qu'on applique ladite composition polymère P par calandrage de ladite composition entre un rouleau d'application (2") à surface deformable et ladite bande B en appui sur ledit rouleau d'appui (1").4.- Method according to any one of claims 1 to 3 characterized in that said polymer composition P is applied by calendering said composition between an application roller (2 ") with deformable surface and said strip B resting on said backing roller (1 ").
5.- Procédé selon l'une quelconque des revendications 1 à 4 caractérisé en ce que ladite composition polymère est appliquée à l'état solide sous forme de film.5.- Method according to any one of claims 1 to 4 characterized in that said polymer composition is applied in the solid state in the form of film.
6.- Procédé selon l'une quelconque des revendications 1 à 4 caractérisé en ce que ladite composition polymère est appliquée à l'état fondu. 6.- Method according to any one of claims 1 to 4 characterized in that said polymer composition is applied in the molten state.
7.- Procédé selon la revendication 6 caractérisé en ce qu'on applique ladite composition polymère à l'état fondu par extrusion directe sur ladite bande en appui sur ledit rouleau d'appui (1 ").7.- Method according to claim 6 characterized in that said polymer composition is applied in the molten state by direct extrusion on said strip bearing on said support roller (1 ").
8.- Procédé selon la revendication 6 caractérisé en ce que l'opération d'application de ladite composition polymère à l'état fondu comprend les étapes consistant à :8.- Method according to claim 6 characterized in that the operation of applying said polymer composition in the molten state comprises the steps consisting in:
- appliquer une nappe de ladite composition P sur un rouleau d'application (2") à surface deformable, - transférer ladite nappe dudit rouleau d'application (2") sur ladite bande s'appuyant sur ledit rouleau d'appui (1 ").- applying a sheet of said composition P to an application roller (2 ") with a deformable surface, - transferring said sheet from said application roller (2") to said strip resting on said support roller (1 " ).
9.- Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que ladite composition polymère P est thermodure et en ce que, après application, on procède à la cuisson de la composition polymère du revêtement de la bande B.9.- Method according to any one of claims 1 to 8, characterized in that said polymer composition P is thermoset and in that, after application, the polymer composition of the coating of the strip B is baked.
10.- Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que ladite composition polymère P est thermoplastique et en ce que, après application et après que la bande B ait quitté le contact avec ledit rouleau d'appui (1 "), on refroidit ladite bande B revêtue.10.- Method according to any one of claims 1 to 8, characterized in that said polymer composition P is thermoplastic and in that, after application and after the strip B has left contact with said support roller (1 "), said coated strip B is cooled.
11.- Procédé selon la revendication 10 caractérisé en ce qu'on refroidit par trempe de manière à obtenir une couche polymère de revêtement présentant une structure amorphe ou partiellement cristalline.11.- Method according to claim 10 characterized in that it is cooled by quenching so as to obtain a polymer coating layer having an amorphous or partially crystalline structure.
12.- Procédé selon la revendication 10 ou 11 dans lequel on refroidit directement la surface dudit rouleau d'application (2").12.- Method according to claim 10 or 11 wherein the surface of said application roller (2 ") is directly cooled.
13.- Procédé selon l'une quelconque des revendications 1 à 12 caractérisé en ce qu'il comprend en outre une étape dans laquelle on applique une composition polymère P" sur la face interne Bi de la bande. 13.- Method according to any one of claims 1 to 12 characterized in that it further comprises a step in which a polymer composition P "is applied to the internal face Bi of the strip.
14.- Procédé selon la revendication 13 caractérisé en ce que, pour cette étape dans laquelle on applique une composition polymère sur la face interne Bi de la bande, on met la dite bande déjà revêtue sur sa face externe Be en défilement sur un rouleau métallique d'appui (1 '") chauffé à surface non deformable de manière à ce que, avant, pendant et après application de la composition polymère P" sur la face interne Bi de la bande, cette bande soit chauffée par contact de sa face externe Be avec ledit rouleau d'appui (1'").14.- Method according to claim 13 characterized in that, for this step in which a polymeric composition is applied to the internal face Bi of the strip, the said strip already coated is put on its external face Be by scrolling on a metal roller support (1 '") heated to a non-deformable surface so that, before, during and after application of the polymer composition P" on the internal face Bi of the strip, this strip is heated by contact with its external face Be with said support roller (1 '").
15.- Procédé selon la revendication 14 caractérisé en ce que ledit rouleau d'appui (1 '") est doté d'une couche anti-adhérente (9).15.- Method according to claim 14 characterized in that said support roller (1 '") is provided with a non-stick layer (9).
16.- Dispositif pour mettre en œuvre le procédé selon l'une quelconque des revendications précédentes, de revêtement d'une bande métallique B présentant une face Be « externe » à revêtir et une face opposée Bi dite « interne », comprenant :16.- Device for implementing the method according to any one of the preceding claims, for coating a metal strip B having an "external" face Be to be coated and an opposite face Bi called "internal", comprising:
- des moyens d'application d'une couche de composition polymère P sur la face externe de la bande, comprenant un rouleau d'appui (1 ") doté de moyens de chauffage, - des moyens de défilement en continu de la bande définissant un chemin de défilement de la bande dans ledit dispositif, caractérisé en ce que :- means for applying a layer of polymer composition P on the external face of the strip, comprising a support roller (1 ") provided with heating means, - means for continuously scrolling the strip defining a strip travel path in said device, characterized in that:
- ledit rouleau d'appui (1 ") est à surface métallique non deformable,- said support roller (1 ") has a non-deformable metal surface,
- lesdits moyens de défilement sont adaptés pour faire défiler la bande sur ledit rouleau d'appui (1 ") en maintenant sa face interne Bi en contact avec la surface de ce rouleau avant, pendant et après application de ladite couche.- Said scrolling means are adapted to scroll the strip on said support roller (1 ") while maintaining its internal face Bi in contact with the surface of this roller before, during and after application of said layer.
17.- Dispositif selon la revendication 16 caractérisé en ce qu'il comprend des moyens additionnels de préchauffage de la bande B à revêtir implantés en amont dudit rouleau d'appui (1 ") sur le chemin de défilement de la bande. 17.- Device according to claim 16 characterized in that it comprises additional means for preheating the strip B to be coated implanted upstream of said support roller (1 ") on the path of travel of the strip.
18.- Dispositif selon l'une quelconque des revendications 16 à 17 caractérisé en ce qu'il comprend des moyens additionnels de postchauffage (6, 8) de la bande B revêtue implantés en aval dudit rouleau d'appui (1 ") sur le chemin de défilement de la bande.18.- Device according to any one of claims 16 to 17 characterized in that it comprises additional post-heating means (6, 8) of the coated strip B implanted downstream of said support roller (1 ") on the tape scroll path.
19.- Dispositif selon l'une quelconque des revendications 16 à 18 caractérisé en ce que lesdits moyens d'application comprennent un rouleau d'application (2") à surface deformable s'appuyant indirectement sur ledit rouleau d'appui (1 ") par l'intermédiaire de ladite bande B, de manière à former avec ce rouleau des moyens de calandrage.19.- Device according to any one of claims 16 to 18 characterized in that said application means comprise an application roller (2 ") with deformable surface indirectly supported on said support roller (1") by means of said strip B, so as to form calendering means with this roller.
20.- Dispositif selon la revendication 19 caractérisé en ce que ledit rouleau d'application (2") est doté de moyens de refroidissement.20.- Device according to claim 19 characterized in that said application roller (2 ") is provided with cooling means.
21.- Dispositif selon la revendication 20 caractérisé en ce que lesdits moyens de refroidissement sont adaptés pour refroidir directement la surface dudit rouleau d'application (2").21.- Device according to claim 20 characterized in that said cooling means are adapted to directly cool the surface of said application roller (2 ").
22.- Dispositif selon la revendication 21 caractérisé en ce que lesdits moyens de refroidissement comprennent une jupe métallique J défilant au contact dudit rouleau d'application (2") pour le refroidir et des moyens de refroidissement de ladite jupe métallique J.22.- Device according to claim 21 characterized in that said cooling means comprise a metal skirt J running in contact with said application roller (2 ") to cool it and means for cooling said metal skirt J.
23.- Dispositif selon l'une quelconque des revendications 16 à 22 caractérisé en ce que lesdits moyens d'application comprennent des moyens d'extrusion de ladite composition P à l'état fondu.23.- Device according to any one of claims 16 to 22 characterized in that said application means comprise means for extruding said composition P in the molten state.
24.- Dispositif selon l'une quelconque des revendications 16 à 23 caractérisé en ce qu'il comprend des moyens de refroidissement de la bande implantés en aval dudit rouleau d'appui (1 ") sur le chemin de défilement de la bande. 24.- Device according to any one of claims 16 to 23 characterized in that it comprises means for cooling the strip located downstream of said support roller (1 ") on the path of travel of the strip.
25.- Dispositif selon la revendication 24 caractérisé en ce que les moyens de refroidissement comprennent au moins un rouleau de refroidissement (4, 4', 4") à surface métallique.25.- Device according to claim 24 characterized in that the cooling means comprise at least one cooling roller (4, 4 ', 4 ") with a metal surface.
26.- Dispositif selon la revendication 24 caractérisé en ce que les moyens de refroidissement comprennent des moyens d'aspersion d'eau et/ou de trempe dans l'eau.26.- Device according to claim 24 characterized in that the cooling means comprise means for spraying water and / or quenching in water.
27.- Dispositif de revêtement de la face Be externe d'une bande métallique B selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend des moyens de revêtement de la face Bi dite interne.27.- Device for coating the external Be face of a metal strip B according to any one of the preceding claims, characterized in that it comprises means for coating the so-called internal Bi face.
28.- Dispositif selon la revendication 27 caractérisé en ce que les moyens de revêtement de la face Bi dite interne sont implantés en aval dudit rouleau d'appui (1 ") sur le chemin de défilement de la bande et comprennent : - des moyens d'application d'une couche de composition polymère P" sur la face interne de la bande, comprenant un rouleau métallique d'appui (1 '") à surface non deformable doté de moyens de chauffage, - et des moyens de défilement de la bande adaptés pour la faire défiler sur ledit rouleau d'appui (1 '") en maintenant sa face externe déjà revêtue Be en contact avec la surface de ce rouleau avant, pendant et après application de ladite couche.28.- Device according to claim 27 characterized in that the means for coating the so-called internal Bi face are located downstream of said support roller (1 ") on the path of travel of the strip and comprise: - means of 'application of a layer of polymer composition P "on the internal face of the strip, comprising a metal support roller (1'") with non-deformable surface provided with heating means, - and means for running the strip adapted to run it on said support roller (1 ′) while maintaining its already coated external face Be in contact with the surface of this roller before, during and after application of said layer.
29.- Dispositif selon la revendication 28 caractérisé en ce que ledit rouleau d'appui (1'") est doté d'une couche anti-adhérente (9).29.- Device according to claim 28 characterized in that said support roller (1 '") is provided with a non-stick layer (9).
30.- Dispositif selon l'une quelconque des revendications 28 à 29 caractérisé en ce qu'il comprend au moins une paire de rouleaux (4, 4") de refroidissement disposée en aval dudit rouleau d'appui (1 '"), les rouleaux successifs (4, 4") d'une paire étant disposés de manière à ce que les deux faces revêtues Bi et Be de la bande viennent alternativement en contact direct avec ces rouleaux (4, 4"). 30.- Device according to any one of claims 28 to 29 characterized in that it comprises at least one pair of cooling rollers (4, 4 ") disposed downstream of said support roller (1 '"), the successive rollers (4, 4 ") of a pair being arranged so that both coated sides Bi and Be of the strip alternately come into direct contact with these rollers (4, 4 ").
EP99970341A 1998-10-14 1999-10-06 Method and device for continuously coating a metal strip with a polymer composition Withdrawn EP1140374A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9812866A FR2784693B1 (en) 1998-10-14 1998-10-14 METHOD AND DEVICE FOR CONTINUOUSLY COATING A METAL STRIP WITH A POLYMER COMPOSITION
FR9812866 1998-10-14
PCT/FR1999/002382 WO2000021687A1 (en) 1998-10-14 1999-10-06 Method and device for continuously coating a metal strip with a polymer composition

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GB1075554A (en) * 1964-10-29 1967-07-12 Briem Hengler & Cronemeyer K G Method and apparatus for laminating and subsequent embossing of webs
GB1295536A (en) * 1970-04-03 1972-11-08
GB1311968A (en) * 1970-04-14 1973-03-28 Int Paper Co Coated substrates
JPS57203545A (en) * 1981-06-09 1982-12-13 Taiyo Seiko Kk Surface treated metallic plate
US4805554A (en) * 1987-05-22 1989-02-21 Acumeter Laboratories, Inc. Method of and apparatus for maintaining uniform hot melt coatings on thermally sensitive webs by maintaining dimensional stability of silicone and rubber-like web back-up rolls
DE3826395A1 (en) * 1988-08-03 1990-02-15 Volker Ludwig METHOD FOR APPLYING LIQUID, PASTOESE OR PLASTIC SUBSTANCES TO A SUBSTRATE
FR2703073B1 (en) * 1993-03-26 1995-05-05 Lorraine Laminage Process and device for the continuous coating of a metallic material in movement by a deposit of polymer with a composition gradient, and product obtained by this process.
KR100352552B1 (en) * 1995-03-22 2002-11-11 알루미늄 컴퍼니 오브 아메리카 Method and Apparatus for Coating a Metal Strip and the Product thereof

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FR2784693B1 (en) 2001-01-19
FR2784693A1 (en) 2000-04-21

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