EP1412095A1 - Procede et dispositif de revetement en continu d'une bande par un film fluide d'epaisseur predeterminee en polymere reticulable exempt de solvant ou de diluant - Google Patents
Procede et dispositif de revetement en continu d'une bande par un film fluide d'epaisseur predeterminee en polymere reticulable exempt de solvant ou de diluantInfo
- Publication number
- EP1412095A1 EP1412095A1 EP02762523A EP02762523A EP1412095A1 EP 1412095 A1 EP1412095 A1 EP 1412095A1 EP 02762523 A EP02762523 A EP 02762523A EP 02762523 A EP02762523 A EP 02762523A EP 1412095 A1 EP1412095 A1 EP 1412095A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- polymer
- molten
- smoothing
- deformable surface
- 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.)
- Granted
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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
- B05D1/42—Distributing applied liquids or other fluent materials by members moving relatively to surface by non-rotary members
-
- 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
- B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
Definitions
- the present invention relates to a method and a device for continuously coating a strip with a fluid film of predetermined and uniform thickness in crosslinkable polymer free of solvent or diluent, the softening temperature of which is greater than 50 ° C.
- This type of polymer has the particularity of having to be hardened by heat treatment or by irradiation (UV radiation, electron beam %), after its application.
- crosslinkable organic coatings such as paints or varnishes for example
- paints or varnishes for example
- a technology particularly used for depositing coatings based on thermoplastic polymers on a moving strip is extrusion through a calibration device such as a T-nozzle, which is used to form a self-supporting sheet of polymer. melted, which is first stretched under the nozzle, then pressed against the moving strip. To press the molten coating film on the substrate, it is possible either to carry out a lamination using a cooled roller (extrusion-lamination), or a plating by a contactless device (extrusion-coating) such as for example a partial vacuum. , or the application of an electrostatic field. Attempts were then made to develop similar methods for depositing crosslinkable organic coatings by melt coating.
- PCT patent WO 95/21706 (DSM NV) describes the use of plating with a roller or an air nozzle to transfer a film of thermosetting coating extruded in the molten state and previously drawn into the air. 5 to 20 times so as to deposit thinly on a preheated metal strip.
- the functional precursors used in the crosslinkable coatings are low molecular weight pre-polymers which have a very low consistency in the molten state. Therefore, it is very difficult to produce a self-supporting free film, calibrated by a nozzle and capable of withstanding a high stretch to form a uniform deposit of very thin thickness (of the order of 5 to 50 ⁇ m) on a strip running. It can be seen that the coatings obtained have large variations in thickness, which prevents the use of this technology for producing thin and uniform coatings.
- Another technique better suited to the application in the molten state of a crosslinkable organic coating consists in forming a pre-dosed polymer film by forced flow through a heated nozzle, placed in quasi contact with the strip to be covered. .
- refinement of the material is obtained by shearing between the outlet plane of the nozzle and that of the strip.
- this direct coating is only well suited when the substrates have a very regular surface state or are flexible (plastic films, paper or cardboard) and supported by a deformable roller, in which case the uniform distribution of the molten material obtained. at the outlet of the nozzle, is maintained in the calibration gap of the final coating which constitutes the space formed between the nozzle and the moving strip.
- the thickness of the deposit is controlled by the virtual air gap that constitutes the separation between the downstream face of the nozzle and the moving substrate.
- the heterogeneities of thickness of the substrate therefore cause local variations in this air gap which induce instantaneous fluctuations in thickness of the coating.
- the object of the invention is therefore to remedy the drawbacks of the methods of the prior art by providing a process for continuously coating strips which allows the application of a uniform and smooth crosslinkable polymer film, of predetermined thickness. over the entire width of this strip, whatever the irregularities in thickness, width or the flatness and positioning defects of the strip.
- the first object of the invention is a process for continuously coating a strip with a fluid film of predetermined thickness E made of crosslinkable polymer free of solvent or diluent, the softening temperature of which is greater than 50 °. C, characterized in that: - the strip is continuously scrolled on at least one support at a controlled speed,
- At least one fluid sheet of said polymer in the molten state, obtained by fusion, is deposited over a part of the width of the strip forced flow of the polymer, said sheet having an average thickness E 'greater than said predetermined thickness E, the temperature of formation of this sheet being lower than the temperature at which crosslinking begins to cross-link the polymer, - the molten polymer is distributed over the entire width of the strip by means of a smoothing device with a deformable surface which forms a continuously renewed reserve of molten polymer, over the entire width of said strip, and - a film of uniform thickness E is formed by shearing of the molten polymer derived from said reserve, between the strip and the smoothing device with deformable surface.
- the presence of the reserve of material makes it possible first of all to compensate for the fluctuations in the metering gap resulting from short-term deformations of the strip. Then, the reserve makes it possible to distribute a uniform layer of material over the entire width of the substrate by dosing in a stable air gap formed by the smoothing device with deformable surface and the strip. The good uniformity of distribution of the material results from the fact that the local variations in thickness or flatness of the strip are compensated for by the flexibility of the smoothing device.
- a film with a smooth appearance is obtained by virtue of the reserve formed between the smoothing device and the strip, which makes it possible to obtain a flow without instability of the molten material between the strip and the smoothing device.
- the predosing of the material by forced flow makes it possible to easily control the overall flow of material which makes it possible to reach the predetermined average thickness E of the coating.
- the thickness of the coating is instantaneously controlled, which can also be kept constant by a servo control system without the intervention of 'an operator.
- the method according to the invention therefore makes it possible to obtain a smooth film of uniform thickness, covering the entire width of the strip, whatever the irregularities of this strip and its positioning on the support.
- the method according to the invention can also have the following characteristics, alone or in combination:
- At least one fluid sheet of polymer in the molten state is deposited by forced flow of said polymer in the molten state, directly on the strip;
- At least one fluid sheet of polymer in the molten state is deposited on the strip, by forced flow of said polymer in the molten state, on a transfer cylinder with deformable surface, said transfer cylinder being driven in rotation in the direction running the strip, then transferring said sheet from the transfer cylinder to the strip by compressing it between the support and the transfer cylinder;
- the smoothing device is a flexible doctor blade
- the smoothing device is a smoothing roller with a deformable surface, possibly driven by a rotational movement in the direction of travel of said strip, the ratio of its tangential speed relative to the speed of travel of the strip being between 1 / 10 and 1/100;
- a second object of the invention is a device for continuously coating a strip with a fluid film of predetermined thickness E made of crosslinkable polymer free of solvent or diluent, the softening temperature of which is greater than 50 ° C., characterized in what it includes: - means for continuously driving the strip,
- FIG. 1 is a schematic sectional view of a first embodiment of a device according to the invention
- FIG. 2 is a schematic sectional view of a second embodiment of a device according to the invention
- - Figure 3 is a perspective view of a third embodiment of a device according to the invention
- FIG. 4 is a schematic sectional view of a fourth embodiment of a device according to the invention.
- the invention aims to continuously coat a strip with a fluid film of predetermined thickness E in crosslinkable polymer free of solvent or diluent.
- This predetermined thickness may preferably be between 2 and 100 ⁇ m, and more particularly preferably between 5 and 50 ⁇ m. It is preferably less than the thickness of the strip.
- the thickness of the strip is between, for example, 0.1 and
- the material of the strip may be a metal such as steel, aluminum, or an aluminum alloy, or even glass or counter plated, for example, and the strip may have been previously painted or covered with a coating on one or two sides.
- the crosslinkable polymer free of solvent or diluent can be crosslinkable thermally, or even by irradiation (UV or electron beam).
- irradiation UV or electron beam
- thermosetting compositions based on hydroxylated polyesters and blocked isocyanates and reference will be made to application WO 95/21706 for a general description of products of this type, well known to those skilled in the art.
- the polymers which can be crosslinked by irradiation can be radical or cationic systems, or even hybrid systems.
- the polymer can usually contain fillers, pigments, additives such as catalysts, plasticizers, stabilizers or any other known additive.
- crosslinking start temperature is understood to mean the temperature from which an increase in viscosity is observed of more than 10% in less than 15 minutes.
- the polymers used in the context of the present invention are such that their softening temperature is greater than 50 ° C., which means that they are solid or very viscous at room temperature.
- Figure 1 there is shown a strip B supported on a support roller 1 made of steel coated with an elastomer, and driven in travel along arrow F by drive means (not shown).
- the device according to the invention also comprises preheating means 2, such as an induction furnace, which make it possible to bring the strip B to a temperature greater than or equal to the temperature of the film of molten polymer, in order to improve the quality adhesion between the polymer and the strip and facilitate spreading and smoothing of the product by lowering its viscosity when passing under the smoothing means.
- preheating means 2 such as an induction furnace
- extrusion machine comprising means for melting the polymer and a nozzle 3 provided with an extrusion slot through which the the sheet of molten polymer forcibly flows over the strip B.
- the extrusion machine may also include a flow control member (not shown) such as a metering pump which is arranged between the extrusion machine and the nozzle 3.
- the supply of the molten material to the extrusion machine is carried out, for example, via a coupled hose.
- the extrusion machine can be replaced by a melter or a heated drum emptier equipped with a liquid pressurizing screw or a gear pump allowing the flow of material to be controlled.
- the means of formation by forced flow of the sheet here consist of the nozzle 3 bearing against the surface of the strip B and provided with means for adjusting the position of the edges of its extrusion slot relative to the surface of the strip B.
- the positioning of the nozzle 3 is carried out using jacks or supports with adjustable position so as to bring it into quasi contact with the strip, parallel to the generator of the support cylinder 1.
- the slot of the nozzle 3 may have a length less than the width of the strip B to form a sheet of polymer not covering the entire width of the strip B, but it may also have a length greater than or equal to this width.
- the slot of the die 3 can also have an adjustable length by displacement of an insert.
- Another method of adjusting the coating consists in using a nozzle with elements juxtaposed but supplied separately.
- This embodiment makes it possible to use the adjustment of the flow rate of material in the lateral elements, either to vary the width of the sheet formed, or to modulate its thickness at the level of the external elements. It is also possible to use a slot nozzle whose downstream face consists of a perfectly straight metal bar, parallel or slightly inclined relative to the plane of the strip. We can adjust by machining the outlet profile of the nozzle and mechanically adjust its inclination relative to the plane of the strip so as to obtain a perfectly smooth appearance of the coating.
- a rotary bar (Meier bar) integrated in the frame of the nozzle and driven by a slight rotational movement which makes it possible to distribute the material in contact with the bandaged.
- This rotary bar then constitutes an easily interchangeable element which makes it possible to avoid re-machining the lips of the nozzle in the event of impact or damage.
- its rotary movement facilitates the elimination of particles or aggregates that may remain blocked in the air gap of the application.
- the thickness profile of the sheet of molten polymer can be adjusted differently between the edges and the rest of the body of the nozzle 3.
- the material is then fed uniformly while at the ends from the nozzle 3, a slight excess thickness of material is generated so as to supply in a controlled manner the reserve of molten material formed up to the ends of the strip B.
- the production of this controlled excess thickness. material at both ends of the nozzle 3 can be easily obtained by playing for example on the opening profile of the lips of the nozzle 3. This over-supply of material then compensates for the transverse flow of the material in the reserve. But it is also possible to supply the whole of the nozzle 3 in a uniform manner.
- the coating device then comprises means for smoothing the sheet of molten polymer in the form of a flexible doctor blade 4 supported by a heating element (not shown). Its inclination is adjusted so as to stabilize the reserve of material taking the form of a bead, and which self-regulates by the following mechanism: if due to an external disturbance too much material accumulates in the bead, this tends to lift the doctor blade and to be absorbed by letting more material pass. If the amount of material in the bead decreases, the retention of the material is reduced and the bead increases and then stabilizes.
- the smoothing blade can be produced as a suspension spring by superimposing metal or plastic blades of different stiffnesses and of different thicknesses. Depending on the heat losses occurring in the smoothing, it may or may not be necessary to preheat the smoothing device at least in its most rigid part.
- the spreading and smoothing of the molten material carried out by means of the dosing and smoothing bead are all the easier when the viscosity of the material is low or when the temperature of the strip B (which controls for a large the temperature of the material in the bead) is higher.
- the strip B can be preheated to a temperature much higher than the temperature at the start of crosslinking of the polymer.
- the coated strip BR then passes through crosslinking means which may be constituted, for example, by an induction furnace when the polymer is crosslinkable thermally, or alternatively by UV lamps or by electron beams when 'it is photoréticulàbie.
- crosslinking means which may be constituted, for example, by an induction furnace when the polymer is crosslinkable thermally, or alternatively by UV lamps or by electron beams when 'it is photoréticulàbie.
- the effect of the radiation is advantageously combined with that of the temperature to accelerate the hardening of the product.
- the straightening roller 6 can be driven in rotation, by appropriate means (not shown) in the direction of travel of the strip B, represented by the arrow fi.
- the device also comprises means for adjusting the tangential speed of said straightening roller 6 in a ratio of between 1/10 and 1/100 times the running speed of the strip B.
- FIG. 3 we can see a device similar to that shown in Figure 2, but allowing to deposit two sheets of molten polymer N1 and N2 initially disjoint, and therefore comprising means of formation by forced flow of two plies, which are distributed over the width of the strip B.
- These means comprise two identical nozzles 7 and 8 provided with extrusion slots through which the plies of molten polymer are forced to flow over the strip B.
- the device can also include two flow control members arranged upstream of nozzles 7 and 8. The application of a fluid film of predetermined thickness E to the strip
- the strip B runs, at a speed of 30 m / min, for example, supported by the support roller 1. It is possibly preheated, preferably at a temperature greater than or equal to the temperature softening the crosslinkable polymer, by passing through the preheating means 2.
- the crosslinkable polymer is melted in each extrusion machine, and two layers of polymer N1 and N2 are formed on strip B by forced flow respectively through nozzles 7 and 8, the formation temperatures sheets N1 and N2 being below the crosslinking temperature of the polymer.
- These two layers N1 and N2 are disjoint and cover part of the width of the strip B.
- Their thickness E ' is greater than the predetermined thickness E. The adjustment of the quantity of material deposited on the strip B can be done very simply by slaving the extrusion rate to the running speed of the strip B.
- the strip coated with these two plies then passes under the straightening roller 6 which forces the excess material relative to E to flow transversely relative to the band B, thus forming a reserve of molten material taking the form of a bead .
- the polymer is thus distributed over the entire width of the strip B, the two layers N1 and N2 being thus joined.
- the film obtained after passing under said straightening roller 6 has a uniform thickness E, and has a smooth appearance without discontinuity.
- This embodiment has the advantage of allowing a uniform coating of very thin film, less than 20 ⁇ m which it would be very difficult to obtain without this roller.
- the sheet is extruded directly onto the strip B, and the nozzle is approached less than 20 ⁇ m from the strip, there is a great risk of damaging the latter if the strip has irregularities of this amplitude.
- the addition of a transfer cylinder therefore makes it possible to achieve very small thicknesses without the risk of damaging the device.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0109269A FR2827200B1 (fr) | 2001-07-12 | 2001-07-12 | Procede et dispositif de revetement en continu d'une bande par un film fluide d'epaisseur predeterminee en polymere reticulable exempt de solvant ou de diluant |
FR0109269 | 2001-07-12 | ||
PCT/FR2002/002329 WO2003008109A1 (fr) | 2001-07-12 | 2002-07-04 | Procede et dispositif de revetement en continu d'une bande par un film fluide d'epaisseur predeterminee en polymere reticulable exempt de solvant ou de diluant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1412095A1 true EP1412095A1 (fr) | 2004-04-28 |
EP1412095B1 EP1412095B1 (fr) | 2006-04-05 |
Family
ID=8865408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02762523A Expired - Lifetime EP1412095B1 (fr) | 2001-07-12 | 2002-07-04 | Procede et dispositif de revetement en continu d'une bande par un film fluide d'epaisseur predeterminee en polymere reticulable exempt de solvant ou de diluant |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1412095B1 (fr) |
AT (1) | ATE322348T1 (fr) |
AU (1) | AU2002328372B2 (fr) |
BR (1) | BR0210952A (fr) |
DE (1) | DE60210466T2 (fr) |
ES (1) | ES2259097T3 (fr) |
FR (1) | FR2827200B1 (fr) |
PT (1) | PT1412095E (fr) |
WO (1) | WO2003008109A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115310550B (zh) * | 2022-08-16 | 2023-07-14 | 国网四川省电力公司电力科学研究院 | 一种大气二氧化碳干空气柱浓度计算方法及系统 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE424511B (sv) * | 1975-08-26 | 1982-07-26 | Inventing Ab | Sett och anordning att bestryka en lopande bana - foretredesvis av papper |
ATE275442T1 (de) * | 1998-06-22 | 2004-09-15 | Farnsburg Engineering Ag | Verfahren und vorrichtung zur berührungslosen kraftübertragung |
FR2787353B1 (fr) * | 1998-12-16 | 2001-03-09 | Lorraine Laminage | Procede et dispositif de revetement en continu d'au moins une bande metallique par un film fluide en polymere reticulable |
-
2001
- 2001-07-12 FR FR0109269A patent/FR2827200B1/fr not_active Expired - Fee Related
-
2002
- 2002-07-04 ES ES02762523T patent/ES2259097T3/es not_active Expired - Lifetime
- 2002-07-04 AU AU2002328372A patent/AU2002328372B2/en not_active Ceased
- 2002-07-04 EP EP02762523A patent/EP1412095B1/fr not_active Expired - Lifetime
- 2002-07-04 AT AT02762523T patent/ATE322348T1/de not_active IP Right Cessation
- 2002-07-04 BR BR0210952-2A patent/BR0210952A/pt not_active IP Right Cessation
- 2002-07-04 WO PCT/FR2002/002329 patent/WO2003008109A1/fr not_active Application Discontinuation
- 2002-07-04 DE DE60210466T patent/DE60210466T2/de not_active Expired - Fee Related
- 2002-07-04 PT PT02762523T patent/PT1412095E/pt unknown
Non-Patent Citations (1)
Title |
---|
See references of WO03008109A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2827200B1 (fr) | 2003-09-12 |
AU2002328372A2 (en) | 2003-03-03 |
ES2259097T3 (es) | 2006-09-16 |
DE60210466D1 (de) | 2006-05-18 |
DE60210466T2 (de) | 2006-11-02 |
ATE322348T1 (de) | 2006-04-15 |
PT1412095E (pt) | 2006-07-31 |
AU2002328372B2 (en) | 2006-08-31 |
FR2827200A1 (fr) | 2003-01-17 |
EP1412095B1 (fr) | 2006-04-05 |
WO2003008109A1 (fr) | 2003-01-30 |
BR0210952A (pt) | 2004-06-08 |
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