EP0016681B1 - Verfahren und Vorrichtung zum fortlaufenden Beschichten eines blattförmigen Materials, insbesondere eines Bandes aus Papier oder Karton - Google Patents

Verfahren und Vorrichtung zum fortlaufenden Beschichten eines blattförmigen Materials, insbesondere eines Bandes aus Papier oder Karton Download PDF

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Publication number
EP0016681B1
EP0016681B1 EP80400306A EP80400306A EP0016681B1 EP 0016681 B1 EP0016681 B1 EP 0016681B1 EP 80400306 A EP80400306 A EP 80400306A EP 80400306 A EP80400306 A EP 80400306A EP 0016681 B1 EP0016681 B1 EP 0016681B1
Authority
EP
European Patent Office
Prior art keywords
blade
web
fact
coating
smoothing
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.)
Expired
Application number
EP80400306A
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English (en)
French (fr)
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EP0016681A1 (de
Inventor
Pierre Girard
Michel Richard
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.)
Centre Technique de lIndustrie des Papiers Cartons et Celluloses
Original Assignee
Centre Technique de lIndustrie des Papiers Cartons et Celluloses
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
Priority claimed from FR7906506A external-priority patent/FR2451418A1/fr
Application filed by Centre Technique de lIndustrie des Papiers Cartons et Celluloses filed Critical Centre Technique de lIndustrie des Papiers Cartons et Celluloses
Publication of EP0016681A1 publication Critical patent/EP0016681A1/de
Application granted granted Critical
Publication of EP0016681B1 publication Critical patent/EP0016681B1/de
Expired legal-status Critical Current

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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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/041—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades
    • 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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • 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
    • B05C5/0245—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 for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
    • 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
    • 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
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material

Definitions

  • the present invention relates firstly to a new continuous surface coating process, using a coating composition, of a sheet element such as a sheet of paper, cardboard, or synthetic material. . It also relates to a device allowing the implementation of this method.
  • the surface coating of a sheet element is a common practice in order to improve the qualities of the element, in particular in the case of paper or cardboard.
  • the coating is carried out in a known manner by depositing a coating composition on the sheet element driven in displacement, then by a spreading and smoothing action of the composition in order to obtain a layer thickness also constant as possible.
  • the spreading and smoothing operation is particularly delicate and has been the subject of extensive technical studies with the aim of seeking the elimination of any malformation in the appearance of the layer produced.
  • the known coating method consists in continuously scrolling the sheet element in a determined direction, in particular from bottom to top, between at least two members located on either side.
  • One of these members consisting of a spreading blade, is applied by one end against a face to be coated with the sheet element.
  • the other end of the blade is moved away from the sheet element and directed relative to the first end in a direction opposite to that of the movement of the sheet element.
  • the other member serves as a holding piece for the sheet member and as a reaction piece for the first.
  • the coating composition is deposited in contact with the face to be coated upstream of the zone of application of said spreading blade against the sheet element.
  • a pressing force is exerted on the spreading blade in the direction of the face to be coated so as to spread the coating composition on the face to be coated.
  • the present invention provides a new improvement in these coating methods. Indeed, the Applicant has detected that the coating techniques known up to now have a certain number of unfavorable consequences, on the one hand, at the level of the sheet element and, on the other hand, at the level of the layer of material with which the sheet element is coated.
  • the object of the process according to the present invention is to eliminate the drawbacks mentioned above by reducing the contact time of the coating composition with the sheet element before the spreading and smoothing operation as much as possible.
  • the process can also be used for coating paper in a molten medium, that is to say for the application of hot-melt polymers, paraffins, waxes, hot-melt. It also makes it possible to carry out coatings using pulverulent products subsequently fixed on the support by passage through an oven, for example if it is a hot-melt powder. Coating could also be carried out using foam products.
  • the method of the invention makes it possible to apply the coating composition either on one or on both sides of the sheet element.
  • the method according to the invention is preferably implemented using a known coating device, in particular as described in the aforementioned patent FR-A-2,359,650, in which the element is circulated in sheet between two members, at least one of which is constituted by a smoothing blade subjected to a force urging it towards the second member which can be constituted either by a fixed reaction part, or by a roller on which the element in sheet, either by a second blade arranged in opposition to the first blade.
  • the flexible blade is applied against the sheet element using a flexible tube filled with a pressurized fluid, so as to be bent with a concavity turned towards the outside and tangent to the sheet over a large area.
  • a first variant of use proposed consists of scrolling the sheet element vertically and from top to bottom.
  • the flexible blade is then held at its upper part and applied at its lower part against the sheet element.
  • the angle formed by the sheet element and the blade then forms a natural reservoir inside which a feed nozzle pours the coating composition so as to maintain an amount of excess composition that the sheet passes through.
  • a second variant of use proposed by this document consists in scrolling the sheet element in a direction different from the previous one and, more particularly, from bottom to top. The position of the spreading blade is then modified accordingly.
  • the coating composition is brought and deposited on the sheet element using a nozzle system adjoining it.
  • the sheet element then plays the role of conveyor for the composition which is conveyed to the necking zone where it is smoothed.
  • the contact time between the sheet element and the composition previously smoothed is very long.
  • the composition is either in a state of stagnation or in a state of vortex movement in the vicinity of the sheet element. This is the reason why, according to these methods, the capillary migration is very high and the viscosity of the composition tends to increase considerably before smoothing.
  • the coating composition is channeled into a fluid vein, directed towards the end point of the insertion corner, by means of lateral routing walls.
  • the composition comes from pressurized means which impart to it a total mechanical energy such that the vein which it constitutes is conveyed by pressure effect towards said point in a translational movement continuously oriented along a trajectory progressively approaching that of scrolling of the sheet element.
  • the method according to the invention essentially consists in channeling the coating composition in the form of a fluid vein directed continuously towards the extreme corner of said introduction cone (mentioned above), this by means of two side routing walls located inside this introduction cone, and: following said means for making the composition available under pressure.
  • Another essential means of the process of the invention consists in imparting to the coating composition, by means of said means of provision under pressure, total mechanical energy such that the fluid vein which it constitutes is conveyed by effect pressure towards the extreme corner in a continuously oriented movement along a trajectory progressively approaching that of the scrolling of the sheet element.
  • the fact of injecting the composition in the immediate vicinity of the coating area has the additional advantage of maintaining, within the composition, a state of shear which keeps it fluid until it passes under the blade, thus ensuring a more efficient and homogeneous smoothing and consequently a significantly improved coating quality.
  • this arrangement limits the contact time between the composition and the sheet element previously to its smoothing. This reduces the migration of the liquid phase from the composition to the sheet element and the subsequent tearing of the latter.
  • An important aspect of the invention further lies in the fact that the sheet element is moved in displacement over at least part of its trajectory substantially vertically from bottom to top and that the coating composition is injected also in a direction oriented from bottom to top.
  • This particular arrangement makes it possible to ensure good regularity of the deposition of the coating composition over the entire width of the sheet element while ensuring efficient evacuation of any excess of said composition, without risking the formation of a reserve. as would be the case if one proceeded to an injection from top to bottom with a scrolling of the sheet element in the same direction.
  • the composition is applied, in a manner known per se, by an injector, the outlet orifice of the latter being placed, according to the invention, at or in the immediate vicinity of the area of contact (or smoothing) between the sheet element and the smoothing blade.
  • the outlet of the injector arranged naturally upstream of this zone with respect to the direction of travel of the sheet element, or located at a distance from the outer edge of the blade, as short as possible according to the mechanical requirements imposed by the scrolling of the sheet element and the structure of the injector and oriented towards the top of the angle formed by the blade and the sheet.
  • the invention also relates to a coating device intended to implement the above method.
  • At least one of the members is constituted by a spreading blade. This is applied by one end against a face to be coated with the sheet element. The other end of the blade is moved apart and directed with respect to the first in a direction opposite to that of travel of the sheet element. Finally, the spreading blade is provided with a possible pressure member, associated with the free end of the blade to exert on it a thrust substantially perpendicular to the sheet member, while the rest of the blade has a curvature with convexity turned towards the sheet element.
  • the blade will be constituted by a flexible and thin blade which is elastically deformable and whose free end in contact with the sheet element will be associated with a pressure member ensuring the flatness of the end of the blade in contact with the sheet member and its parallelism with said sheet member.
  • the pressure member may consist of a tube containing a pressurized fluid.
  • the pressure member consists of an elastic counter blade, which may be less flexible than the smoothing blade, located outside the smoothing blade, relative to the element in sheet form, the free end of which rests on the smoothing blade at the point of contact between said smoothing blade and the sheet element.
  • Figure 1 shows in perspective and in section a device for coating a sheet 1 intended for coating a single face of the sheet.
  • Said sheet 1 is driven in displacement in the direction of the arrow by a conventional driving device which has not been shown.
  • the sheet is partially wound on a rotating roller 2.
  • the coating or coating device is generally indicated at 3 and comprises a fixed and hollow box 4, placed under the roller 2, being spaced from it from a distance "e" and the axis 4a of which extends substantially parallel to the axis of the roller and over the entire length of the latter.
  • the internal chamber 5 of the box closed at its ends, is supplied with a coating composition under pressure by a pumping group shown diagrammatically at 6 and connected to a reservoir containing the composition.
  • a slot 7 is made along the length of the box in the vicinity of the roller 2.
  • a flexible blade 8 On one of the edges of the slot is fixed the stationary end of a flexible blade 8, the free end of which is elastically biased in abutment against the sheet 1, downstream of its fixed end in the direction of travel of the sheet, by virtue of the bending of said blade whose convexity is turned towards the roller 2.
  • the arrangement is such that the free end 9 of the blade tangent the curvature of the roller.
  • a pneumatic tube 10 mounted on the body 4 by means of a support 10a (holding the tube over its entire length) exerts pressure over the entire length of the end 9 of the blade.
  • the tube is connected to a source of pressurized air for example, which makes it possible to regulate the pressure exerted on the blade.
  • the fixed end of the blade is spaced from the sheet member and the blade forms with the latter a corner 11. Furthermore, the edges of the slot 7 formed in the box are inclined, from the inside to the outside, in the direction of travel of the sheet element so that they guide, in the direction of the arrow 12, the composition leaving under pressure from the chamber 5 towards the corner 11 formed between the blade and the sheet element. It can be seen that the arrow 12 is oriented substantially 'along the bisector of the angle formed between the blade and the sheet element. It will be noted that the possible excess of coating composition may be evacuated from the corner 1 1 by trickling along arrow 3 on the part of the body located upstream of the slot 7, the fraction of composition thus eliminated being recovered for example in a bin 13 located under the body. The distance "e" between the top of the box and the sheet will be sufficient to allow passage of the excess part of the coating composition while avoiding contact between the latter and the sheet.
  • FIG. 2 represents the general configuration of a coating installation according to the invention.
  • Figure 2 shows the end of a paper making machine which is equipped with a device according to the invention.
  • the two faces of the sheet are coated and, consequently, may have to undergo a pre-drying operation of the layer before the sheet comes into contact with the cylinders 32 and 33. , in order to prevent the still fresh layer from adhering to the cylinders and thereby being deteriorated.
  • first pre-drying element for the face of the sheet intended to come into contact with the roller 28 and in 350 a second pre-drying element for the other face of the sheet.
  • the device according to the invention could only carry out the coating of one of the faces of the sheet and, in this case, we could only provide only one drying system.
  • the sheet element 21 circulates, in the case of Figure 2, vertically from bottom to top.
  • the coating device 130 could consist of one of the variant embodiments which will now be described.
  • the coating device has been produced using two crate assemblies 30 and 30a similar to the crate in FIG. 1 and arranged on either side of a sheet of paper 21 moving roughly vertically from bottom to top.
  • the two body assemblies 30 and 30a are identical and symmetrical with respect to the plane of the sheet 21. It will therefore be sufficient to describe them alone.
  • the box 34 has an internal chamber 35 in which the coating composition supplied under pressure circulates.
  • An inclined slot 37 (serving as an injector) is made in the box and against the wall of the most distant slot of the sheet 21 is fixed one end of a flexible blade 38 elastically deformable.
  • a support 40a fixed on the body 34 supports over its entire length a tube 40 filled with a pressurized fluid (the pressure being adjustable).
  • the two blades 38 are applied on either side of the sheet 21, their free ends being exactly in opposition and forming a zone of contact with the sheet which is parallel to the latter. in order to achieve spreading and smoothing of the layer.
  • the blades are kept under tension one against the other and they therefore have a curvature whose convexity is directed towards the sheet 21, the blades moving away from the sheet from their free end by providing therewith a corner 41.
  • the axis of the slot, materialized by the arrow 42 (which also materializes the path of the vein of coating composition injected into the corner 41 is oriented substantially towards the smoothing zone provided by the free ends of the blades. vein of the composition therefore reaches the sheet immediately upstream of said smoothing zone.
  • FIG 4 there is shown schematically another embodiment in which two blades 50 and 51 are used which are rigid and symmetrical of which only the blade 50 will therefore be described.
  • This rigid blade has a general curvature turned towards the sheet 21 and is pierced with a median channel 52 for admitting the coating composition to the sheet.
  • the channel 52 communicates on the one hand with a source of composition under pressure not shown and opens, on the other hand, at 53 on the free end of the blade, this free end having a flat area 54 and parallel to the sheet 21 which is responsible for spreading and smoothing the layer.
  • the blades can be articulated at their lower ends mounted on a fixed support (not shown) to allow adjustment of the thickness of the layer to be deposited.
  • the example shown in FIG. 4 is the ideal case where the injection of the coating composition and the smoothing take place simultaneously and in the same place.
  • the coating and smoothing device consists of two pairs of blades 60 arranged symmetrically with respect to the vertical sheet 21 and therefore only one will be described.
  • the two blades 61 and 62 of each pair of blades are flexible and elastically deformable. They are also fixed by their lower end in a blade support 63 by screws 64 allowing their removable.
  • the supports 63 are spaced on either side of the sheet 21.
  • the two blades are spaced from one another by a hollow box 65 which is used for the admission under pressure of the coating composition in the direction of the arrow; the box is connected to a composition source (not shown). Due to this arrangement, the two blades 61 and 62 are superimposed and sensitive parallel.
  • the two blades 61 are applied one against the other, under tension, on each side of the sheet 21 and the same is true of the two blades 62.
  • the tension of the blades results of the position of the supports 63.
  • an injector passage 66 making it possible to inject the coating composition between the free ends 67 and 68 of the blades on the sheet 21.
  • at least the free ends 67 of the downstream blades 61 are applied to the sheet so as to be plane and parallel to the sheet.
  • the flatness of these ends is optionally maintained by a pneumatic tube 69 (shown in broken lines) identical to the tubes of FIGS. 1 to 4.
  • FIG. 6 The embodiment of Figure 6 is that which appears to be particularly suitable for industrial use.
  • a fixed structure (not shown) is equipped with two substantially horizontal bars 70, spaced apart and between which a sheet element 21 which is intended to receive a coating composition passes vertically.
  • the coating device consists, as before, of two sets symmetrical with respect to the sheet and of which only one will therefore be described.
  • the support structure 71 On the bar 70 is mounted a support structure 71 capable of tilting and being immobilized around the bar under the action of a position adjustment mechanism (not shown).
  • the support structure 71 has a slide 72 in which a blade holder 73 is engaged which can be locked in the slide by any suitable means.
  • the lower end 74 of a blade 75 is removably fixed in the support, for example by screws 76 in order to allow possible replacement of the blade.
  • the blade 75 is flexible and elastically deformable and when the two structures 71 are in the position shown in FIG. 6, the free ends 77 of the blades are applied to the sheet 21.
  • the blades are kept in this position under tension and therefore have a curvature with convexity turned towards the sheet 21.
  • the blade holders 73 are spaced from the sheet 21 by a distance which can be adjusted by means of the structure 71, which makes it possible to modify the force applying the blade to the sheet and consequently, the thickness of the diaper.
  • each blade is associated with a pneumatic tube 78 containing a pressurized fluid (the pressure of which can be adjusted) and exerting on the end of the blade a pressure whose direction is substantially perpendicular to the sheet, this pressure ensuring the flatness of the end of the blade and its parallelism with the sheet.
  • a pneumatic tube can be carried over its entire length, for example by a support whose arms 79 (shown in broken lines) are fixed to the corresponding blade holder.
  • An injector 80 of coating composition constituted by an elongated hollow box and open at 81 to constitute an injection nozzle is suspended from the structure 71, between the sheet 21 and each of the blades 75.
  • the suspension of the box is constituted by rods 88, one end 82 of which is adjustably engaged in the structure 71 while the other end 83 constitutes a bearing for an axis 84 integral with the box 80.
  • the box is connected to its lower part , via a pipe 85, to a source of coating composition equipped with a pressurized supply system for the box (not shown).
  • the position of the box is adjustable relative to the structure by pivoting around the suspension axes 84 and that once the box placed in a suitable position, it can be locked in this position by any locking system (not shown ) appropriate.
  • the injection nozzle 81 of the box is located as close as possible to the smoothing area reserved between the ends 77 of the blades.
  • the composition is injected directly into the corner formed between each of the blades and the sheet 21 and the injection nozzle is embedded in the product.
  • the possible excess of product is evacuated from the injection zone by trickling onto the face 86 of the box opposite the sheet 21, this face progressively moving away from the sheet.
  • the distance between the nozzle of the injector and the smoothing zone must be as small as possible.
  • the device according to the invention makes it possible to produce both symmetrical coatings as in FIGS. 3 to 6 as well as asymmetrical coatings as in FIGS. 8 and 9.
  • FIG 8 there is shown in solid lines the device according to the invention in which, as in the previous figures, the blades I 1 and I 2 are symmetrical with respect to the sheet element S.
  • the blades I 1 and I 2 are symmetrical with respect to the sheet element S.
  • the blades make the same angle a with respect to the element S, in the case of asymmetry, the blade L 1 forms an angle y and the blade L z an angle ⁇ with the element S.
  • ⁇ is smaller than y.
  • the L z blade is smoother.
  • the pressure member is not a pneumatic chamber, but, for example, a counter blade (FIGS. 10 to 13), the same asymmetries will obviously be obtained by moving the positions of the lines d under the same conditions. support of the counter blades on the smoothing blades.
  • Figures 10 to 13 show an advantageous means for exerting pressure on the smoothing blade, on the contact zone between this smoothing blade and the paper.
  • the pressing member is constituted by an elastic counterblade situated outside the smoothing blade, and the free end of which is kept applied elastically on the smoothing blade at the point of contact between said smoothing blade and the sheet element.
  • the opposite end is anchored in a movable support so that, when it is tensioned, the counter blade has a curvature with convexity turned towards the sheet element.
  • This counter blade can be made of any suitable flexible material: metal, plastic, etc.
  • the counter blade can be arranged either in the same direction as the corresponding smoothing blade, or in opposite direction, the respective anchoring points of the smoothing blade and the counter blade being, in the latter case, located on either side of the contact area between these two elements.
  • a strip of paper 1 runs from bottom to top, in the direction of the arrow, in a suitable machine.
  • Two smoothing blades 75, 75 'held by supports 73, 73' exert on both sides of the paper strip, at a point 91, a pressure to smooth on each of the two faces a layer of a coating composition .
  • the coating composition is brought between the paper strip and the blade 75, by means of a device not shown such as those described in the previous examples.
  • the flatness of the free end of the blade 75, 75 ′ is ensured by means of a counter blade 83, 83 ′.
  • the blades 83, 83 ' are shorter than the blades 75, 75' which are advantageously very flexible, which also provides a more uniform smoothing effect over the width of the sheet.
  • Each counter blade 83 is anchored in a support 84. Thanks to simple conventional means not shown, the supports 84 can be turned on themselves, and moved vertically (y'y) and horizontally (x'x). It is thus possible to adjust the pressure force, by modifying the curvature of the counter blade, while placing the free edge of the counter blade in the vicinity of the free edge of the smoothing blade.
  • the device comprises the same elements as in FIG. 10 and in addition auxiliary means in the form of pneumatic tubes 78, 78 ′, which can be placed at any point of the counter blade, towards the middle, or towards the free edge. We can then adjust in addition the fluid pressure inside the pneumatic tube and the position of this tube on the counter blade.
  • the device of FIGS. 12 and 13 comprises all the elements of the device of FIG. 10, and in addition a pressure system constituted by a series of segments or fingers 85, arranged along the width of the sheet, and which can be placed so to act on the counter blade at any point situated between the free end of said counter blade and its anchor point.
  • these fingers are adjustable. They can be adjusted one by one, or together, manually or automatically, for example controlled by a device connected to a sensor which detects irregularities in the layer across the width of the sheet, so as to modify the pressure exerted by one or more fingers, depending on the correction to be made to faults detected at their level.
  • the fingers can be mounted in a support 86, which can include all the elements allowing automatic or manual control.
  • inventions of the pressure member described above are particularly suitable for obtaining good straightness and high reliability of the support on the smoothing blades. They also allow, in industrial operation, an easy and precise adjustment of the support line, the latter being well defined and easy to visualize.

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  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Claims (16)

1. Verfahren zum kontinuierlichen Überziehen eines blatt- oder bogenartigen Elementes (1, 21) bei welchem
- das blatt- oder bogenartige Element (1) von unten nach oben in einer im wesentlichen vertikalen Richtung kontinuierlich zwischen wenigstens zwei beiderseits des blatt- oder bogenartigen Elementes angeordnete Organe (38) geführt wird, von denen wenigstens eines durch ein Streichblatt (38) dargestellt ist, das an einem Ende gegen eine zu überziehende Fläche des blatt- oder bogenartigen Elementes angelegt ist und dessen anderes Ende von diesem Element in einem Abstand liegt und mit Bezug auf das erste Ende in eine Richtung gerichtet ist, die zu der Richtung der Bewegung des blatt- oder bogenartigen Elementes umgekehrt ist, und von denen das andere Organ als Reaktionsteil für das erste Organ bildet,
- die Überzugszusammensetzung mit der zu überziehenden Fläche in Berührung gebracht wird, und zwar stromauf der Zone, in welcher das Streichblatt gegen das blatt-oder bogenartige Element angelegt ist, und bei welchem
- eine Drückkraft auf das Streichblatt ausgeübt wird in Richtung gegen die zu überziehende Fläche derart, daß das Verstreichen der genannten Überzugszusammensetzung auf der zu überziehenden Fläche gewährleistet ist,

dadurch gekennzeichnet, daß man
- einerseits die Überzugszusammensetzung in Form eines Stromfadens (42) kanalisiert, der kontinuierlich gegen die Spitze des Winkels (a), der zwischen dem blatt- oder bogenartigen Element (21) und dem Streichblatt (38, 61, 75) gebildet ist, durch zwei seitliche Leitwände gerichtet ist und aus einer Einrichtung (35) austritt, welche diese Zusammensetzung unter Druck zur Verfügung stellt, und
- andererseits der Überzugszusammensetzung mittels der genannten Einrichtung (35), welche die Zusammensetzung unter Druck zur Verfügung stellt, eine mechanische Gesamtenergie erteilt derart, daß der Stromfaden (42), den die Zusammensetzung bildet, durch Druckeinwirkung in Richtung gegen die Spitz des Winkels (a) vorbewegt wird in einer kontinuierlichen Translationsbewegung, die entlang einer Bewegungsbahn orientiert ist, die sich der Bewegungsbahn des blatt- oder bogenartigen Elementes (21) zunehmend annähert.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man weiterhin das Streichblatt (38) einer Kraft unterwirft, die von seiner Biegekraft verschieden ist, hinter der Stelle der Berührung zwischen dem Streichblatt und dem blatt- oder bogenartigen Element angelegt und in Richtung gegen die zu überziehende Fläche des blatt- oder bogenartigen Elementes gerichtet ist.
3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Zusammensetzung mit der zu überziehenden Fläche des blatt- oder bogenartigen Elementes in Berührung gebracht wird unter Verwendung eines Injektors (52, 66), der durch die Konvergenz der beiden genannten seitlichen Leitwände (61, 62) des Stromfadens gebildet ist und dessen Austrittsöffnung in unmittelbarer Nähe der Zone (54) der Berührung zwischen dem blatt- oder bogenartigen Element und dem Streichblatt mit Bezug auf die Bewegungsrichtung des blatt- bzw. bogenartigen Elementes (21) stromauf dieser Zone angeordnet ist.
4. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Zusammensetzung mit der zu überziehenden Fläche des blatt- oder bogenartigen Elementes in Berührung gebracht wird unter Verwendung eines Injektors (80), dessen Austritt von dem freien Ende des Streichblattes (75), welches sich mit dem blatt- oder bogenartigen Element in Berührung befindet, in einem Abstand (d) liegt, der gebildet ist durch die Summe aus der Dicke (e) des Injektors und aus dem erforderlichen Spiel (e) zwischen dem Injektor (80) und dem blatt-oder bogenartigen Element (21) einerseits, und dem Streichblatt (75) andererseits, multipliziert mit dem Kotangens des Winkels (a), der von dem Streichblatt mit dem blatt- oder bogenartigen Element gebildet ist.
5. Vorrichtung zum kontinuierlichen Überziehen eines blatt- oder bogenartigen Elementes (21, insbesondere eines Blattes oder Bogens aus Papier, Pappe, Kunststoffmaterial oder aus einem ähnlichen Material mit Hilfe einer Überzugszusammensetzung, mit
- einer Einrichtung zum kontinuierlichen Führen und Bewegen des blatt- oder bogenartigen Elementes von unten nach oben in einer im wesentlichen vertikalen Richtung,
- einer Einrichtung, mit welcher die Überzugszusammensetzung zur Verfügung gestellt wird,
- und mit zwei Organen (8, 2. 38), zwischen denen das blatt- oder bogenartige Element (21) läuft, von denen wenigstens eines (38) durch ein Streichblatt gebildet ist, das an einem Ende gegen eine zu überziehende Fläche des blatt- oder bogenartigen Elementes (21) angelegt ist und dessen anderes Ende sich in einem Abstand von diesem befindet und mit Bezug auf das erste Ende in eine Richtung gerichtet ist. die zu der Richtung der Bewegung des blatt-oder bogenartigen Elementes umgekehrt ist, wobei das Streichblatt gegebenenfalls mit einem Drückorgan (40, 40a) versehen ist, welches dem freien Ende des Streichblattes zugeordnet ist und auf dieses eine Schubkraft in einer Richtung im wesentlichen rechtwinklig zu dem blatt- oder bogenartigen Element (21) ausübt derart, daß das freie Ende im wesentlichen eben ist, während der übrige Teil des Streichblattes eine Krümmung darbietet, deren Konvexität in Richtung gegen das blatt-oder bogenartige Element (21) gerichtet ist. dadurch gekennzeichnet, daß die Einrichtung, welche die Überzugszusammensetzung zur Verfügung stellt, eine Austrittsöffnung (81, 53) besitzt, die einen Injektor (80) bildet, der zwischen den beiden Enden des Streichblattes (38) nahe demjenigen Ende des Streichblattes, weiches sich mit dem blatt- oder bogenartigen Element (21) in Berührung befindet, angeordnet und in Richtung gegen die Spitze des Winkels (a) gerichtet ist, der zwischen den blatt- oder bogenartigen Element und dem Streichblatt gebildet ist.
6. Vorrichtung nach Anspruch 5, die dazu bestimmt ist, eine einzige Fläche des blatt- oder bogenartigen Elementes (1) zu überziehen, dadurch gekennzeichnet, daß das Streichblatt an einem Träger (4) befestigt ist, der außerdem einen geschlossenen Innenraum (5) für die Kanalisierung der Überzugszusammensetzung aufweist, dessen Konvergenz wenigstens eine Öffnung (7) darstellt, die nahe demjenigen Ende des Streichblattes (8) liegt, welches an dem Träger befestigt ist, und die den genannten Innenraum mit dem Bereich (11) zwischen dem auf der Außenseite des Trägers liegenden Teil des Streichblattes und dem Streichblatt zugewandten Teil des blatt- oder bogenartigen Elementes (1) liegt, und daß eine Einrichtung (6) vorgesehen ist, um zu gewährleisten, daß die Überzugszusammensetzung unter Druck in Form eines Stromfadens gespritzt wird, der sich außerhalb des Innenraums (5) des Trägers und in dem genannten Bereich (11) translatorisch bewegt.
7. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Streichblatt wenigstens einen Zuführkanal (52) für die Überzugszusammensetzung aufweist, der in seiner Dicke gebildet ist und über eine Öffnung (53) in der Zone (54) des Streichblattes mündet, die sich mit dem blatt- oder bogenartigen Element (21) in Berührung befindet, und daß der Kanal als Injektor dient und das Streichblatt weiterhin stromab der Öffnung und in Richtung der Bewegung des blatt- oder bogenartigen Elementes einen ebenen Teil (54) aufweist, der sich gegen das blatt- oder bogenartige Element (21) legt und das Streichen ausführt.
8. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Injektor (66) gebildet ist durch einen Raum zwischen zwei übereinander angeordneten biegsamen Blättern (61, 62), die einer Spannung unterworfen und im wesentlichen parallel zueinander angeordnet sind und die beide an einem Ende an einem Träger (63) verankert sind, der sich von dem blatt- oder bogenartigen Element (21) in einem Abstand befindet, und deren freie Enden (67, 68) gegen das blatt- oder bogenartige Element (21) angelegt sind, indem sie zwischen sich einen Zwischenraum bilden, durch welchen hindurch die im Inneren des Raumes zwischen den beiden Blättern vorbewegte Überzugszusammensetzung gegen das blatt- oder bogenartige Element (21) gebracht wird, und daß das in Richtung der Bewegung des blatt-oder bogenartigen Elementes stromabwärtige Blatt das Streichblatt der Vorrichtung darstellt.
9. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Injektor (80) für die Uberzugszusammensetzung in dem Winkel (a). der zwischen dem blatt- oder bogenartigen Element und dem Streichblatt gebildet ist, angeordnet ist, und daß die Austrittsöffnung des Injektors von dem freien Rand des Streichblattes in einem Abstand (d) angeordnet ist, der gleich ist der Summe aus der Dicke (e) des Injektors (80) und dem erforderlichen Spiel (e) dem Injektor (80) und dem blatt- oder bogenartigen Element (21) einerseits und dem Streichblatt (75) andererseits, multipliziert mit dem Kotangens des scheinbaren Winkels (a), der von dem Streichblatt und dem blatt- oder bogenartigen Element gebildet ist.
10. Vorrichtung nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, daß das auf das Streichblatt (38) Druck ausübende Organ ein mit Druckmittel gefülltes biegsames Rohr (40) aufweist.
11. Vorrichtung nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, daß das Drückorgan durch ein elastisches Gegenblatt (83) gebildet ist, welches von dem Streichblatt verschieden oder getrennt ist, mit Bezug auf das blatt- oder bogenartige Element (1) auf der Außenseite des Streichblattes (75) angeordnet ist, und dessen freies Ende auf das Streichblatt in der Höhe der Zone der Berührung zwischen dem Streichblatt und dem blatt- oder bogenartigen Element einen Druck ausübt, der durch die elastische Biegekraft des Gegenblattes dargestellt ist.
12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die Biegung des Gegenblattes hervorgerufen ist durch Verschiebung der Stelle der Verankerung des Gegenblattes (83) mit Bezug auf das blatt- oder bogenartige Element und/oder durch seine Drehung auf der Achse der Verankerungsstelle.
13. Vorrichtung nach Anspruch 1 1, dadurch gekennzeichnet, daß die Beigung des Gegenblattes hervorgerufen ist durch ein Luftrohr (78), welches sich an dem Gegenblatt (83) an einer Stelle abstützt, die zwischen der Verankerungsstelle und dem freien Ende des Gegenblattes (83) liegt.
14. Vorrichtung nach Anspruch 1 1, dadurch gekennzeichnet, daß die Biegung des Gegenblattes hervorgerufen ist durch eine Reihe von einstellbaren Segmenten oder Fingern (85), die entlang der Breite des Streichblattes angeordnet sind und die auf das Gegenblatt (83) entlang einer Linie einwirken, die zu dem freien Ende des Gegenblattes parallel verläuft und zwischen diesem freien Ende und der Verankerungsstelle des Gegenblattes liegt.
15. Vorrichtung nach den Ansprüchen 5 bis 14, wobei die Vorrichtung bestimmt ist zum gleichzeitigen Überziehen der beiden Flächen eines blatt- oder bogenartigen Elementes, dadurch gekennzeichnet, daß sie zwei identische Vorrichtungen (75, 75') aufweist, die mit Bezug auf das blatt- oder bogenartige Element (1) symmetrisch angeordnet sind.
16. Vorrichtung nach den Ansprüchen 5 bis 14, wobei die Vorrichtung dazu bestimmt ist, die beiden Flächen eines blatt- oder bogenartigen Elementes gleichzeitig zu überziehen, dadurch gekennzeichnet, daß sie zwei identische Vorrichtungen (L3, L4) aufweist, die beiderseits des blatt- oder bogenartigen Elementes (S) angeordnet sind, und daß die freien Enden der Streichblätter mit Bezug auf das blatt- oder bogenartige Element auf dem gleichen Niveau angeordnet sind, während die Abstützlinien der Drückorgane entlang des blatt- oder bogenartigen Elementes auf einer Seite mit Bezug auf die andere Seite geringfügig versetzt sind, um auf den beiden Flächen des blatt- oder bogenartigen Elementes die Charakteristiken asymmetrischer Überzüge zu erhalten.
EP80400306A 1979-03-14 1980-03-06 Verfahren und Vorrichtung zum fortlaufenden Beschichten eines blattförmigen Materials, insbesondere eines Bandes aus Papier oder Karton Expired EP0016681B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR7906506A FR2451418A1 (fr) 1979-03-14 1979-03-14 Procede et dispositif pour l'enduction en continu d'un element en feuille, notamment une bande de papier ou de carton
FR7906506 1979-03-14
FR8003392 1980-02-15
FR8003392A FR2476165A2 (fr) 1979-03-14 1980-02-15 Procede et dispositif d'enduction en continu d'un element en feuille, notamment une bande de papier ou de carton

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EP0016681A1 EP0016681A1 (de) 1980-10-01
EP0016681B1 true EP0016681B1 (de) 1984-05-09

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JP (1) JPS55159871A (de)
BR (1) BR8001407A (de)
CA (1) CA1158110A (de)
DE (1) DE3067733D1 (de)
ES (1) ES8200426A1 (de)
FI (1) FI64962C (de)
FR (1) FR2476165A2 (de)

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FR2476165B2 (de) 1983-11-10
CA1158110A (fr) 1983-12-06
FR2476165A2 (fr) 1981-08-21
BR8001407A (pt) 1980-11-11
JPS55159871A (en) 1980-12-12
ES489603A0 (es) 1981-11-01
DE3067733D1 (en) 1984-06-14
US4331713A (en) 1982-05-25
FI800701A (fi) 1980-09-15
EP0016681A1 (de) 1980-10-01
FI64962B (fi) 1983-10-31
ES8200426A1 (es) 1981-11-01
FI64962C (fi) 1984-02-10

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