WO1996015860A1 - Machine a enduction directe pour bandes de metal allongees - Google Patents

Machine a enduction directe pour bandes de metal allongees Download PDF

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Publication number
WO1996015860A1
WO1996015860A1 PCT/CA1995/000661 CA9500661W WO9615860A1 WO 1996015860 A1 WO1996015860 A1 WO 1996015860A1 CA 9500661 W CA9500661 W CA 9500661W WO 9615860 A1 WO9615860 A1 WO 9615860A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating head
coating
strip article
slot
piston
Prior art date
Application number
PCT/CA1995/000661
Other languages
English (en)
Inventor
Robert Arthur Innes
Carl Wollam
Original Assignee
Alcan International Limited
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 Alcan International Limited filed Critical Alcan International Limited
Publication of WO1996015860A1 publication Critical patent/WO1996015860A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0295—Floating coating heads or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work

Definitions

  • This invention relates to apparatus used for the direct coating of strip articles, such as metal sheet, with paints or plastics to provide surface protection and/or to improve the appearance of the article.
  • Metal sheet material and particularly thin aluminum strip used.for beverage can stock and other purposes, is frequently coated with paints or plastics to provide surface protection and/or decorative finishes.
  • the coatings are typically applied by dissolving or suspending polymers and other components in organic solvents, applying the resulting mixtures by roller coater to the strip, and baking the resulting product to remove the solvents and to cross-link the polymer.
  • An alternative means of applying such coatings is to employ an extrusion die movably connected to a supporting structure and having die lips of a suitable shape arranged around an extrusion opening in the form of an elongated slot extending transversely above the surface of the strip.
  • the die lips are positioned close to the strip and the clearance between strip and die lips is precisely controlled by adjusting the position of the extrusion head relative to the supporting structure.
  • the thickness uniformity of the coating depends on the precision used in the manufacture and control of the die and the precision of the support roll generally used to support the sheet material during coating, as well as the uniformity of the metal gauge along the strip. As a result, it proves very difficult in practice to produce uniform coatings of the desired thickness.
  • the coating head is pushed resiliently towards the strip and the extended surface directly contacts the coating material as it is applied to the strip, thus generating hydrodynamic forces that cause the head to "float" on the layer of coating as it is applied to the strip. Direct contact between the strip and the coating head can thus be avoided, and this in turn avoids damage to or defacement of the metal or pre-coated metal surface to which the coating is applied.
  • the types of apparatus disclosed in this patent and application rely on the loading forces under which the coating head is pushed towards the surface of the strip article, as well as the hydrodynamics of the coating material as it is applied to the surface, for control of the coating thickness and can readily compensate for variations in the gauge of the strip or, in the case of a single-sided coater, the eccentricity of the support roll.
  • the coating head must be free to move in a direction perpendicular to the coating surface in response to varying imbalances in the opposing hydrodynamic and loading forces.
  • this is achieved by attaching the coating head to a fixed, flat supporting plate in such a way that the head can slide back and forth to a limited extent in the desired perpendicular direction.
  • the attachment is achieved by providing the head with elongated slots for receiving hold-down bolts that clamp the head to the plate, but nevertheless allow for sliding of the head in the lengthwise direction of the slots.
  • Loading is applied to the coating head by pneumatic cylinders that are themselves connected to a support arrangement that includes the supporting plate for the coating head.
  • the support arrangement can be rotated around a pivot point, thus swinging the coating head away from the operational position adjacent to the surface of the strip article.
  • the problem with this type of arrangement is that, under the dynamic loading conditions that apply during use of the apparatus, considerable friction may develop between the contacting surfaces of the coating head and the supporting plate and/or between the inner surfaces of the mounting slots in the coating head and the retaining bolts. This friction impedes the desired free movement of the coating head towards and away from the surface of the strip article as coating progresses and may consequently result in the formation of a coating layer of non-uniform thickness.
  • Variations of this arrangement have been suggested.
  • One such variation involves positioning the coating head in a deep slot in a rigid support so that it can slide into and out of the slot while supported between the slot side surfaces.
  • this arrangement suffers from the same disadvantages as the apparatus described above.
  • Another variation involves mounting the coating head on linear ball bearings, but wide coater heads require several sets of such bearings, resulting in difficulties in achieving accurate alignment and the need for a relatively complex design. These bearings are also vulnerable to contamination by coating material.
  • An object of the present invention is to simplify apparatus used for direct coating of strip articles.
  • Another object of the invention is to reduce friction encountered by coating heads in apparatus used for direct coating of strip articles. Yet another object is to simplify the design of apparatus used for coating strip articles so that maintenance may be carried out.
  • apparatus for coating a strip article including a rigid coating head defining an elongated open-sided slot and having an extended surface immediately adjacent to the open side of the slot; a strip feeder for continuously longitudinally advancing the strip article successively past the slot and the extended surface of the coating head in a direction of movement transverse to the slot with a major surface of said article arranged at an angle to said extended surface to form a converging coating gap; a supply apparatus for supplying liquid coating material under pressure to the slot; and a load application device for pushing the coating head towards said major surface of the strip article facing the slot while permitting free movement of said coating head in a plane transverse to said direction of movement and substantially perpendicular to said major surface of the strip article; characterized in that said coating head is rigidly connected to said load application device with said load application device itself providing sole support for said coating head against substantial movement of the coating head in a direction other than said transverse perpendicular plane.
  • the extended surface of the coating head is arranged at a small angle to the surface of the strip article during coating to form a coating gap that converges in the direction of movement of the strip. Since this angle is quite small (normally in the range of 0.1 to 5°, or more preferably 0.5 to 1°), virtually any deflection of the coating head is unacceptable since it causes the angle to approach 0°, and the apparatus will not work properly when the coating surface is fully parallel to the strip surface. In general, the deflection of the coating head should preferably be no greater than about 0.005 cm (2 thousandths of an inch) or the angle of the extended surface may be changed to an unacceptable extent. Accordingly, the load application device must be sufficiently robust to prevent such deflection of the coating head without ancillary support.
  • the load application device used in the present invention may be any device that is capable of delivering a constant force in the perpendicular direction while also providing the required rigid support for the coating head against unwanted non- perpendicular movement.
  • the device must be capable of achieving this rigid support without the need for ancillary support of the coating head, such as a support surface or element, that may generate friction impeding the free movement of the coating head as the head moves in the intended direction towards or away from the surface of the strip article.
  • sufficiently rigid load application devices such as mechanical springs and electromagnetic mechanisms may be suitable, it is preferable to use robust, limited stroke piston and cylinder devices, most especially pneumatic piston and cylinder devices, configured to minimize free play in the coating direction of the strip article.
  • apparatus for coating a strip article including a rigid coating head defining an elongated open-sided slot and having an extended surface immediately adjacent to the open side of the slot; a strip feeder for continuously longitudinally advancing the strip article successively past the slot and the extended surface of the head in a direction transverse to the slot with a major surface of said article arranged at an angle to said extended surface to form a converging coating gap; a supply apparatus for supplying liquid coating material under pressure to the slot; and at least load application device for pushing the coating head towards a major surface of the strip article facing the slot while permitting free movement of said coating head in a direction perpendicular to said surface of the strip article; and a support for said load application device movable between a retracted position, in which the coating head carried by the load application device is positioned at an operational distance from said strip article, and an extended position, in which the coating head is separated from the strip article by a distance greater than the operational distance.
  • Fig. 1 is a simplified perspective view of an apparatus according to a preferred form of the present invention
  • Fig. 2 is a side elevation, partly in cross- section, of the apparatus of Fig. 1;
  • Fig. 3 is a transverse vertical side elevation, partially in cross-section, of the apparatus of Fig. 1;
  • Fig. 4 is a view similar to Fig. 3, showing the coating heads in a retracted position suitable for maintenance;
  • Fig. 5 is a simplified schematic view illustrating the operating principle of the rams used in the apparatus of Figs. 1 to 4.
  • BEST MODES FOR CARRYING OUT THE INVENTION The apparatus shown in Figs. 1 to 5 is a two-sided coating apparatus for applying surface coatings simultaneously to opposite sides of an advancing sheet of aluminum or other strip article to be coated. It should be kept in mind, however, that the present invention can be applied equally well to single-sided coating of the type disclosed in U.S. patent 4,675,230 mentioned above. In such alternative apparatus, only one movable coating head would be provided for coating one side of the strip article and the other side would be supported by a suitable rotatable drum or the like.
  • the coating apparatus 10 has a pair of rigid spaced supports in the form of thick rectangular metal plates 11, 12 surrounding and supporting a pair of opposed elongated rigid coating heads 14, 14' between which a strip article 15 is advanced (not shown in Figs. 1 and 2 , but see Fig. 3) for double-sided coating.
  • the lower supporting plate 12 is rigidly held in a fixed position by four supporting legs 16, which may be anchored to the floor of the building in which the equipment is located.
  • the upper supporting plate 11 is supported at each of its four corners by hydraulic rams 18 having a lifting capacity capable of raising the upper supporting plate 11 and the equipment carried by this plate, including the upper coating head 14'.
  • the lower ends of these devices are attached to the upper coating head 14', so the upper coating head is supported entirely and solely by the piston and cylinder devices and are movable in a direction towards or away from the upper supporting plate 11 according to the movement of pistons 20c in the cylinders 20b (see Fig. 2) .
  • the attachment of the piston rods 20a to the upper coating head 14' is a rigid attachment created by bolts 22 extending upwardly from the coating head 14' and threaded axially into the lower ends of the piston rods 20a.
  • While the upper coating head 14' is free to move in the manner indicated above, i.e. in a vertical plane at right angles to the direction of advancement of the strip article 15, movement of any other kind is constrained by the rigid attachment of the coating head 14' to the piston rods 20a, which are in turn free to move only in the desired direction by virtue of their rigid attachment to pistons 20c that are vertically slidable in cylinders 20b.
  • the cylinders of the devices 20 are in turn rigidly attached to the upper supporting plate 11 and movement of the upper supporting plate is itself prevented, except for optional vertical movement to be explained later, by its rigid attachment to the hydraulic rams 18 that are themselves rigidly connected to the lower supporting plate 12.
  • the only movement of the coating head 14' that is possible, except for the stated movement in the vertical plane, is that allowed by virtue of free play that may exist between the pistons 20c and cylinders 20b within the devices 20 since free play in hydraulic rams 18 is prevented, when the apparatus is in normal operation, for the reasons explained later.
  • pistons 20c within the cylinders 20b do not directly contact the inner walls of the cylinders. Instead, the pistons are each provided with two O-rings 20d (i.e. piston rings made, for example, of Buna-N elastomer) , one at the top and one near the bottom of each piston 20c. These 0-rings are interposed between the pistons and the inner cylinder walls and allow minimal free play.
  • O-rings 20d i.e. piston rings made, for example, of Buna-N elastomer
  • the diameter of the piston rods 20c is made large (e.g. 7.6 cm (3 inches) in diameter, compared to 2.5 cm (one inch) that is normal in conventional devices) to minimize flexing of the rods and the resulting deflection of the compressible O-rings, and the pistons operate with a short length of travel (stroke) compared to their overall length, e.g. of only about 1 cm, to ensure a rigid support by lengthening the lever arm between the piston and the rod seal compared to the distance between the rod seal and the coating head. While the stroke may be short, the devices are preferably made quite long (e.g.
  • the illustrated arrangement has the desired effect of allowing the upper coating head 14' to "float" freely under the countervailing effects of the load applied by the piston and cylinder devices 20 and the hydrodynamic effects of the layers of coating material applied by the coating heads 14 and 14' on the opposite sides of the strip article 15, without bearing against any stationary ancillary support, thus easily and rapidly accommodating any irregularities of the gauge of the strip article or variations in the dynamics of the coating layers. Since the movable coating head 14' does not contact a stationary surface, no friction is developed by the coating head to impede the required vertical movement. Nevertheless, movement other than that in the desired transverse vertical plane is substantially prevented by virtue of the indicated rigid connection of the coating heads within a stable rigid frame formed by the supporting plates 11 and 12 and the rams 18.
  • the devices 20 are preferably pneumatically operated for rapid response to changes in net forces encountered by the head 14', similar devices operated hydraulically could be provided instead but steps must then be taken to ensure that the same rapid response is achieved.
  • the hydraulic device could be coupled to a load cell for detecting the required force response (e.g. to a variation in the thickness of the sheet) .
  • the load cell would sense the need to apply more or less force and almost instantaneously cause a valve in the hydraulic mechanism to feed in more fluid or, conversely, to release fluid from the cylinder.
  • a piston-in-cylinder device or other device could be operated by a mechanical spring.
  • Such devices have the advantage over hydraulic devices that response times to coating gap variations are faster and thus no such load cell or equivalent pre-sensing device is required.
  • the coating heads 14, 14' may be generally the same as those disclosed in U.S. Patent No. 4,675,230 and in WO 94/27739.
  • the heads are in the form of hollow elongated rectangular rods that are supplied with liquid or molten coating material from suitable conventional supply apparatus 17 (shown only in simplistic form in Fig. 2) via inlet ports 24, 24'.
  • the heads face each other across a narrow gap 25, for receiving the strip article 15 to be coated, and are each provided with an elongated open-sided slot 26, 26' penetrating the heads within the gap 25 so that the coating material may be extruded from the interior of the coating heads onto each major face of the strip article as it advances through the gap.
  • the heads are also provided with extended surfaces 27, 27' on the opposed surfaces of the heads within the gap 25.
  • These surfaces are formed adjacent to the slots 26, 26' on the downstream sides of the opposed surfaces and, as indicated above, serve the function of controlling the thickness of the coating material as it is applied to the strip article through the slots.
  • the surfaces each form gaps between the coating heads and the adjacent strip surfaces that converge slightly in the direction of travel of the strip article. The forces exerted on these extended surfaces by the coating material in the gaps cause the upper coating head 14' to move up or down when such forces are out of equilibrium with the loading force applied by the load application devices 20.
  • the strip article 15 is advanced through the gap 25 by a suitable sheet strip feeder, e.g. driven rolls 19, 19', from a coil (not shown) of the strip article.
  • a suitable sheet strip feeder e.g. driven rolls 19, 19'
  • the strip article 15 After passing through the apparatus, the strip article 15 usually traverses an extended run before being recoiled, the run being long enough to allow for drying or solidification of the coating material forming layers on the opposed surfaces of the strip article.
  • This extended run may, if desired, pass through a baking oven (not shown) to accelerate the drying of the coating material .
  • the plate 11 can be raised by feeding hydraulic fluid from a suitable pump 18d into the lower chamber 18b and withdrawing it from the upper chamber 18a through piping provided with valves 18e and 18f. For lowering of the plate 11, this process is reversed. In the fully retracted (operational) position, both of the valves 18e and 18f are closed so that hydraulic fluid remains trapped in each chamber 18a and 18b, thus preventing any up or down movement of the piston 18c. The plate 11, and hence the upper coating head 14', is consequently held motionless on the incompressible hydraulic fluid within these chambers.
  • the upper parts of the hydraulic rams on the supply side of the apparatus carry fixed plates 30 that extend down below the level of the strip article 15 and support an elongated element, in the form of a roller 31, that extends beneath the lower surface of the strip article.
  • the plates 30 and the attached roller 31 are also raised.
  • the roller contacts the lower surface of the strip article 15 to support it at the height of the lower coating head 14. This prevents the strip from sliding on the lower coating head surface with metal-to-metal contact.
  • the roller 31 descends out of the way and no longer contacts the strip article 15.
  • Figs. 1 to 5 could be modified for single-sided coating by replacing the lower coating head 14 with a support drum rigidly mounted for rotation within the lower supporting plate 12 or an equivalent fixed supporting structure.
  • the strip article 15 would ride over the upper surface of the support drum and would receive coating material from the coating head 14' positioned opposite to the highest point of the drum.
  • the lever arm ratios at fully extended and at retracted (operational) extensions of the piston rods was calculated as follows for a device as illustrated in Figs. 1 to 5 having a piston diameter of 7.6 cm (3 inches) , an overall available stroke (with the piston rods fully extended) of 10.8 cm (4.25 inches), and an operational stroke (the extension when coating a strip article) of 0.64 cm (0.25 inches) :
  • the deflection of the coater head during operation should preferably be no greater than about 0.005 cm (2 thousandths of an inch), and the lever arm ratio should preferably be no greater than about 0.60 or less for a 7.6 cm (3 inch) diameter piston.

Landscapes

  • Coating Apparatus (AREA)

Abstract

Appareil destiné à enduire une bande de métal d'un revêtement uniforme. L'appareil comprend une tête à enduction rigide définissant une fente allongée à côté ouvert et présentant une surface étendue contiguë au côté ouvert de la fente. En mode de fonctionnement, la surface étendue est disposée en angle par raport à la surface à enduire pour former un espace de revêtement convergent. L'appareil comprend également un dispositif d'alimentation par bande pour faire avancer la bande successivement, de manière continue et dans le sens de la longueur, devant la fente et la surface étendue de la tête dans le sens transversal de la fente; un dispositif de distribution destiné à distribuer le liquide de revêtement sous pression à la fente; et un dispositif d'application de charges solidement fixé destiné à pousser la tête d'enduction vers une surface importante de la bande de métal se trouvant en face de la fente tout en autorisant la tête d'enduction à se déplacer librement dans un axe perpendiculaire à la surface de la bande de métal. Selon un mode de réalisation, la tête de revêtement est solidement fixée au dispositif d'application de charges, celui-ci agissant comme unique support de la tête d'enduction pour empêcher que celle-ci ne se déplace dans un axe non perpendiculaire à la surface de la bande. Dans un autre mode de réalisation, le dispositif d'application de charges est pourvu d'un suppport que l'on peut déplacer entre une position de marche, où la tête d'enduction portée par le dispositif à piston et à cylindre se positionne à distance de fonctionnement de la bande, et une position retirée, où la tête d'enduction est séparée de la bande de métal par une distance plus importante que la distance de fonctionnement pour la maintenance, les réparations ou l'insertion d'une nouvelle bande.
PCT/CA1995/000661 1994-11-23 1995-11-23 Machine a enduction directe pour bandes de metal allongees WO1996015860A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US34411794A 1994-11-23 1994-11-23
US344,117 1994-11-23

Publications (1)

Publication Number Publication Date
WO1996015860A1 true WO1996015860A1 (fr) 1996-05-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000025935A1 (fr) * 1998-11-04 2000-05-11 Minnesota Mining And Manufacturing Company Systeme de montage de matrices de revetement flottant
US6376012B1 (en) * 1999-04-13 2002-04-23 Alcan International Limited Control of coating thickness in sheet article coaters
EP3199247A1 (fr) * 2016-01-27 2017-08-02 Coatema Coating Machinery GmbH Verseur a fentes et installation de revetement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445458A (en) * 1982-07-21 1984-05-01 E. I. Du Pont De Nemours And Company Beveled edge metered bead extrusion coating apparatus
US4675230A (en) * 1985-11-12 1987-06-23 Alcan International Limited Apparatus and method for coating elongated strip articles
EP0451863A2 (fr) * 1990-04-13 1991-10-16 Fuji Photo Film Co., Ltd. ProcÀ©dé d'application d'un liquide sur un substrat flexible
WO1995021702A1 (fr) * 1994-02-08 1995-08-17 Minnesota Mining And Manufacturing Company Coucheuse a racle a courant transversal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445458A (en) * 1982-07-21 1984-05-01 E. I. Du Pont De Nemours And Company Beveled edge metered bead extrusion coating apparatus
US4675230A (en) * 1985-11-12 1987-06-23 Alcan International Limited Apparatus and method for coating elongated strip articles
EP0451863A2 (fr) * 1990-04-13 1991-10-16 Fuji Photo Film Co., Ltd. ProcÀ©dé d'application d'un liquide sur un substrat flexible
WO1995021702A1 (fr) * 1994-02-08 1995-08-17 Minnesota Mining And Manufacturing Company Coucheuse a racle a courant transversal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000025935A1 (fr) * 1998-11-04 2000-05-11 Minnesota Mining And Manufacturing Company Systeme de montage de matrices de revetement flottant
US6231671B1 (en) 1998-11-04 2001-05-15 3M Innovative Properties Company Floating coating die mounting system
US6376012B1 (en) * 1999-04-13 2002-04-23 Alcan International Limited Control of coating thickness in sheet article coaters
EP3199247A1 (fr) * 2016-01-27 2017-08-02 Coatema Coating Machinery GmbH Verseur a fentes et installation de revetement
WO2017129668A1 (fr) * 2016-01-27 2017-08-03 Coatema Coating Machinery Gmbh Coucheuse à rideau et installation de revêtement

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