EP0808668A2 - Dispositif d'application pour l'application directe ou indirecte d'un liquide ou d'une pâte sur une bande en défilement - Google Patents

Dispositif d'application pour l'application directe ou indirecte d'un liquide ou d'une pâte sur une bande en défilement Download PDF

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Publication number
EP0808668A2
EP0808668A2 EP97107886A EP97107886A EP0808668A2 EP 0808668 A2 EP0808668 A2 EP 0808668A2 EP 97107886 A EP97107886 A EP 97107886A EP 97107886 A EP97107886 A EP 97107886A EP 0808668 A2 EP0808668 A2 EP 0808668A2
Authority
EP
European Patent Office
Prior art keywords
parallelogram body
parallelogram
pressure
force
pressing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97107886A
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German (de)
English (en)
Other versions
EP0808668A3 (fr
Inventor
Zygmunt Madrzak
Manfred Ueberschaer
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.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Papiermaschinen GmbH
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 Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0808668A2 publication Critical patent/EP0808668A2/fr
Publication of EP0808668A3 publication Critical patent/EP0808668A3/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to an applicator for direct or indirect application of a liquid or pasty medium to a running material web, in particular made of paper or cardboard, according to the preamble of claim 1. Furthermore, the invention relates to a special method for adjusting a longitudinal and / or Cross-section of a liquid or pasty medium applied directly or indirectly to the running material web by means of such an application unit.
  • a generic application is known from WO 93/05887 and comprises a support beam which extends in the longitudinal direction essentially over the entire width of the material web, a counter roller opposite the support beam, a detachably fixed and essentially fixed by means of a holding device on the support beam Squeegee element in the form of a squeegee blade, which extends over the entire width of the mating roller, and a pressing element which is arranged on the supporting beam and is directly and / or indirectly subjected to a pressing force by a pressing device, with which the squeegee blade is assigned in the region of the mating roller to the mating roller Doctor blade tip can be pressed against the counter roller with a predetermined pressure.
  • the entire pressing mechanism primarily serves to adjust the longitudinal profile, i.e. the layer thickness of the applied liquid or pasty medium.
  • EP 0 512 971 A1 Another application, which is comparable with the previously described prior art, results from EP 0 512 971 A1.
  • the pressing device itself is designed as the pressing element which directly contacts the doctor blade and acts on the pressing force.
  • Two pressure hoses are used as the pressure device or pressure elements. When viewed in cross section on the side of the doctor blade facing away from the counter roller, they are arranged one above the other in the vertical direction and exert a contact pressure on the doctor blade.
  • this solution leads to a very strong deflection of the doctor blade and thus, with an increase in the contact pressure, to an undesirable change in the sweep angle of the doctor blade.
  • the invention is therefore based on the object of creating a generic applicator and a suitable method for adjusting a longitudinal and / or transverse profile of a liquid or pasty medium applied directly or indirectly to the running material web by means of such an applicator that, in the known state of the art Technology avoids existing disadvantages as far as possible and in a simple and effective manner an exact setting of the doctor blade and thus the line profile of the applied liquid or pasty medium allowed.
  • the application unit according to the invention is characterized in that the pressure element, when viewed in cross-section, is designed as a parallelogram body which is mounted at one end in or on at least one holder and runs essentially parallel to the doctor element.
  • the three-dimensional pressing element therefore essentially has the shape of an elongated parallelepiped.
  • the doctor element can in principle be any doctor element suitable for the intended purpose, for example a doctor blade, a doctor bar, a doctor blade bed with a doctor blade and the like.
  • the bearing point or the bearing points themselves or other suitable holding or clamping devices and the like can serve as a holder.
  • a counter-roller is to be understood both as an applicator roller to which the liquid or pasty medium for producing an indirect application is applied, and also a roller carrying the running material web, the liquid or pasty medium being applied directly to the latter variant the running material web is applied.
  • the application unit according to the invention allows the doctor blade element and the line profile to be set in a simple and effective manner and thus an improvement in the line quality of the liquid or pasty medium applied to the counter roller or to the material web running on the counter roller.
  • the construction of the entire pressing mechanism, in particular the pressing element, can be simplified and thus material-saving and inexpensive.
  • the special design of the pressure element as a parallelogram body allows the pressure force emanating from the pressure device and directed to the doctor element to be transmitted in parallel or linearly to the doctor element without a substantial change in the direction of its force vector.
  • the design of the applicator according to the invention allows the pressing force to be introduced into the doctor element in the immediate vicinity of the end of the doctor element, which in turn has a positive influence on the quality of the order to be produced with the applicator, reduces fluctuations in the quality of the coating, and in particular can be realized very advantageously with doctor blades. Adverse hysteresis phenomena are minimized or do not appear through the use of the parallelogram body according to the invention.
  • the parallelogram body can advantageously perform functions of a profiling device for setting a transverse profile of the applied liquid or pasty medium, as will be explained in more detail below.
  • the pressure element designed as a parallelogram body also represents a dirt-insensitive arrangement that is easy to clean and maintain.
  • the application unit according to the invention can be made very compact overall.
  • the parallelogram body in its simplest Embodiment comprises at least three hingedly connected individual parts, of which two individual parts are of equal length, spaced parallel to one another and articulated with their respective lower ends to one of two bearing points arranged at a predetermined distance from one another, and of which the third individual part is the first two individual parts connected at their upper ends in an articulated manner, the length of the third individual part measured between the upper articulation points corresponding to the distance between the two bearing points of the first two individual parts.
  • fourth individual part can be inserted between the lower articulation points of the first two individual parts, but this is not absolutely necessary.
  • the parallelogram body thus resembles an articulated rectangle, as is known, for example, from gear theory.
  • the articulated connection of the respective individual parts to one another and the articulated connection to a bearing point can take place, for example, via fully articulated connecting parts, hinges or with the aid of elastic, local thin points in the material of the respective individual parts or the like. Since the parallelogram body designed in this way is an inherently movable structure, suitable stabilizing elements can be provided which stabilize the parallelogram body in its rest position. A connection of the parallelogram body to the pressing device or an elastic support part can serve as such a stabilizing element.
  • the parallelogram body is designed as an elastic spring element, against the restoring force of which the pressing device acts directly or indirectly starting from a neutral position of the parallelogram body when it is activated, and which returns to the neutral position by its restoring force when the pressing device is deactivated . In this way it is Returning the parallelogram body to its neutral position and thus no additional adjusting movement of the pressing device is required to relieve the squeegee element, and the pressing device can accordingly be easily configured as a single-acting pressing device.
  • the parallelogram body according to the invention can be realized practically particularly cheaply in that the parallelogram body has a sandwich-like structure when viewed in cross-section, with two spaced and essentially parallel plates and at least two plates arranged between the plates and spaced apart in the vertical direction of the parallelogram body and with the flat pieces connected to the plates, the first flat piece lying in a lower section and the second flat piece lying in an upper section of the parallelogram body.
  • this construction has essentially the same properties as the parallelogram body variant described above and made from several articulated individual parts.
  • the sandwich-like parallelogram body also has an elastic spring action against which the pressing device, starting from a neutral position of the parallelogram body, acts directly or indirectly when it is activated, so that when the pressing device is deactivated, the parallelogram body returns to the neutral position due to its restoring force.
  • the desired spring stiffness of the parallelogram body can be achieved in a simple manner by using thicker or thinner plates and / or by a certain thickness of the flat pieces arranged between the plates.
  • Metal plates are particularly suitable as plates, but in principle any other plate material is also conceivable, for example fiber-reinforced plastic plates or the like. The same applies to the choice of material for the said flat pieces.
  • the upper edge of the holder is preferably flush with the upper edge of the lower flat piece of the parallelogram body.
  • the thickness of the flat pieces arranged between the two sheets has proven useful to design the thickness of the flat pieces arranged between the two sheets to be substantially greater than the thickness of the sheets themselves.
  • the flat pieces can be glued, soldered, welded, riveted, screwed or connected to them in some other suitable way.
  • the upper flat piece is divided into segments over the longitudinal extent of the parallelogram body.
  • a subdivision of the plates framing the flat pieces is not absolutely necessary.
  • the segment-like subdivision of the upper flat piece is preferably formed by one or more separating joints which are arranged in the upper flat piece and are laterally spaced apart and essentially vertical.
  • These parting lines can be designed both as partial incisions in a continuous upper flat piece or as parting lines that divide the upper flat part into a plurality of individual parts separated by the respective parting lines.
  • the two design variants of the upper flat piece described above can also be combined.
  • the upper edge section of the parallelogram body is segmented over its longitudinal extent and forms two or more tongue-like edge elements.
  • This segment-like Subdivision can also be achieved by vertically running joints or incisions, but in contrast to the embodiment described above and relating to the upper flat piece, these separating joints or cuts also extend through at least one of the plates sandwiching the flat pieces.
  • the segment-like subdivision of both the flat piece of the parallelogram body and the upper edge section of the entire parallelogram body itself is particularly advantageous for setting a transverse profile of the applied liquid or pasty medium, as will be explained below.
  • the upper edge of the parallelogram body is provided with a support nose which is angled towards the doctor element and which can be contacted with the doctor element in the immediate vicinity of the doctor element end associated with the counter-roller (for example, in the case of a doctor blade, the blade tip) and which transmits the pressing forces emanating from the pressing device directly or indirectly to the doctor element.
  • An indirect transmission of the pressing forces is given, for example, if at least one force-transmitting component is interposed between the pressing device and the supporting lug or the parallelogram body itself.
  • the support lug preferably extends at a right angle to the vertical direction of the parallelogram body.
  • the support lug allows the parallelogram body and thus also the pressing device acting on the parallelogram body to be arranged further away from the doctor element end or the counter roller and at the same time to place the contact point between the doctor element and the nose tip of the support lug contacting the doctor element very close to the free doctor element end. which, as already explained at the beginning, has a positive effect on the stroke quality of the order.
  • the support nose is an integral part of the parallelogram body.
  • the support lug represents at least one separate component which is fixed on or on or in the upper free edge of the parallelogram body. This fixation is expediently designed so that the support lug can be easily detached from the parallelogram body.
  • the support nose can basically be made from any suitable material.
  • a relatively soft material such as plastic
  • a metal profile inserted into the tip of the support nose is particularly suitable for such a wear-resistant contact surface.
  • the support lug tapers towards its tip.
  • a tapering can be achieved both by symmetrical or asymmetrical profile sections of the support lug.
  • the taper can be continuous or discontinuous.
  • the tapering can be realized by a bevel attached to the top or bottom, that is to say the side of the support nose facing or facing away from the counter-roller. This slope then allows the support nose to be arranged near the counter roller and thus also to place the contact point between the support nose tip and the doctor element in the immediate vicinity of the doctor element end (ie when using a doctor blade: the doctor blade tip).
  • the support nose extends continuously, i.e. undivided, covering essentially the entire web width of the application unit.
  • At least a section of the region of the support nose adjoining the upper edge of the parallelogram body is divided into segments, while the edge of the support nose associated with the doctor blade, and thus also the support nose tip, is continuously over extends essentially the entire web width of the applicator.
  • This modification is particularly suitable in connection with the above-described formation of tongue-like edge elements in the upper parallelogram body edge or the segment-like division of the upper intermediate piece of a sandwich-like parallelogram body. If the segment-like subdivision of the last-mentioned components is achieved, for example, by parting lines or incisions, these parting elements expediently continue in the region of the supporting lug adjoining the upper edge of the parallelogram body.
  • the entire support nose is divided into segments and thus facilitates zone-by-zone elastic deformation of the parallelogram body to set a desired cross profile.
  • a distance between the contact point of the support nose and doctor element from the free end of the doctor element assigned to the counter-roller has been found to be favorable, which is in a range of approximately 2 to 30 mm, and here again in particular a distance in a range of approximately 3 to 20 mm .
  • the invention is not restricted to these values; rather, depending on the application, there can be considerable deviations from the data mentioned.
  • the support lug designed as a separate component when viewed in cross section, comprises a claw-like section with which it is placed and / or fixed on the upper free edge of the parallelogram body.
  • the back of the support nose facing away from the doctor element comprises the pressing device.
  • the back of the support nose facing away from the doctor element comprises a suitable adapter for establishing a connection to the pressing device.
  • This adapter is preferably designed so that the pressing device is easily detachable from the support nose.
  • the application unit according to the invention is designed such that the vector of the pressing force emanating from the pressing device passes through the contact point parallelogram body-doctor element or the contact point support nose-doctor element and in the neutral position of the parallelogram body essentially at right angles to its vertical extension.
  • This not only permits a structurally favorable linear force flow and also enables a force transmission to the doctor element in which the pressing force starting from the pressing device and directed to the doctor element is transmitted in parallel or linearly to the doctor element without a substantial change in the direction of its force vector. In this way, the pressing force acting on the doctor element does not receive a component which deviates from the intended force direction and which could negatively influence the doctor element setting in the manner explained at the beginning.
  • the pressing device is arranged on the side of the parallelogram body facing away from the counter-roller, a mounting location being particularly suitable, which is located between the parallelogram body and a counter bearing attached to the supporting beam. It is also provided that the pressing device is fixed to the counter bearing connected to the supporting beam or to a component corresponding to it.
  • the pressing device acts on the parallelogram body in a central and / or upper section thereof.
  • a pneumatically actuated pressure hose and / or pressure cushion has proven particularly useful as a pressing device.
  • any other suitable pressing devices can be used, such as mechanical, hydraulic, electrical, magnetic pressing devices and the like.
  • the applicator further comprises a profiling device for setting a cross profile of the applied liquid or pasty medium.
  • this profiling device can be the pressing device described above itself or else a separate device.
  • the profiling device preferably engages directly and / or indirectly on the upper edge of the parallelogram body and exerts a uniform or locally different contact pressure on the parallelogram body, which is different over different parallelogram body sections.
  • the setting of a cross profile of the applied liquid or pasty medium is accordingly carried out by zone-wise adjustment of the Parallelogram body using the aforementioned profiling device.
  • the profiling device is a component which is independent of the actual pressing device and is used in combination with the pressing device
  • the pressing device is preferably positioned such that it engages the central part of the parallelogram body.
  • the setting of the longitudinal and transverse profiles can therefore take place independently of one another, the pressing device being responsible for the longitudinal profile and the profiling device for the transverse profile setting.
  • both the transverse and the longitudinal profile of the medium applied can be manipulated by a single structural component.
  • the vector of a contact force emanating from the profiling device and assigned to a specific section of the parallelogram body by the contact point parallelogram body-doctor element or the contact point support nose-doctor element and in the neutral position of the parallelogram body essentially at right angles to whose vertical extension runs.
  • the profiling device acts in particular in a central section of the parallelogram body, while the pressing device acts directly and / or indirectly on the parallelogram body in the region of the upper edge and on the previously described way a Applies pressing force to the parallelogram body, which in turn transmits this pressing force to the doctor element.
  • an exactly reverse configuration can also be used.
  • the profiling device comprises a plurality of individual actuators, each of which is assigned to one or more of the segment-like subdivisions of the parallelogram body or the segment-like subdivisions of the support lug of the parallelogram body.
  • the cross profile of the liquid or pasty medium to be applied can thus be set in zones.
  • This embodiment is particularly expedient in the case of a pressing device which also takes over the functions of a profiling device for setting a cross profile.
  • the individual actuators of the profiling device are, for example, mechanical, pneumatic, hydraulic, electrical, magnetic, electromagnetic, thermal, electrothermal actuators and the like, and combinations thereof.
  • electrical actuators also include actuators based on induction or eddy current effects, which exert a force on the parallelogram body or influence it, for example, due to an induction-related thermal effect, which in turn results in an actuating action of the parallelogram body.
  • thermal actuators are also to be understood as meaning those which achieve a thermal effect by the action of radiation or a heated or cooled liquid or gaseous medium on the parallelogram body.
  • pneumatic individual actuators double-acting pneumatic cylinders are particularly preferred since, if required, these enable a large number of control strategies and control concepts suitable for setting both a longitudinal and a transverse profile.
  • At least one of the individual actuators it has also been found to be advantageous for at least one of the individual actuators to be arranged in or on at least one of the side surfaces of the parallelogram body.
  • a heating element on the side of the parallelogram body facing away from the doctor blade can be glued to the outer plate of the body and, when heated or cooled, a change in length of this plate relative to the plate facing the doctor element and thus a locally limited and cause usable actuating movement for setting a transverse profile of the applied liquid or pasty medium.
  • a comparable effect can be achieved if at least one of the two outer plates of the sandwich-like parallelogram body is manipulated by the action of an eddy current or by the passing of a heated or cooled liquid or gaseous medium.
  • the application unit according to the invention advantageously further comprises at least one control and / or regulating device for the controlled adjustment of the pressing forces of the pressing device and / or the profiling device.
  • This allows the application unit to be adapted to changing operating conditions, in particular it allows a simple change in the contact pressure of the doctor element and an adjustment of both the longitudinal and transverse profiles of the applied liquid or pasty medium, both during operation and at a standstill, depending on various parameters.
  • the longitudinal and / or transverse profile is set by controlled , interdependent or independent force effects of the pressing device and / or the profiling device on the parallelogram body, which transmits these forces accordingly to the doctor element and thus realizes the desired profile shape.
  • a respective longitudinal and / or transverse profile setting does not necessarily have to be realized by the joint interaction of the pressing device and the profiling device, but it is also provided in the sense of the invention that at least one of these two devices takes over both setting tasks, the each second device can be in an inactive state. This will be discussed in more detail below. It is also a matter of course that a cross profile setting does not necessarily have to be carried out if the order on the running material web already satisfies the requirements placed on a desired cross profile.
  • the force of the profiling device on the parallelogram body is preferred zone by zone or local.
  • This design feature of the method according to the invention can be realized particularly advantageously in the case of a parallelogram body, the upper side edge or the upper flat part of which is segment-like divided over the longitudinal extent of the parallelogram body.
  • the zone-by-zone or locally limited force can then preferably be exerted by an individual actuator of the profiling device assigned to the segment formed in each case.
  • the longitudinal profile is set by means of the pressing device, and the transverse profile is set by means of the profiling device.
  • the setting of the longitudinal profile takes place over substantially the entire web width by generating a predetermined force action of the pressing device (for example a pneumatic pressure hose), and the setting of the cross profile based on a weak state of the individual actuators (for example pneumatic pressure pad) of the profiling device by applying a positive force action of the individual actuators on the parallelogram body, this positive force action being added to the predetermined force action of the pressure device.
  • the longitudinal profile is set exclusively by applying a predetermined pressure to the pressure hose, which is transferred to the doctor element via the parallelogram body, while the pressure cushion is initially depressurized are activated and only when necessary individually or in large numbers and exclusively for setting a cross profile, that is to say they are pressurized. Accordingly, a single pressure pad can only locally increase, but not reduce, the contact pressure exerted on the doctor element via the parallelogram body.
  • the longitudinal profile is set by means of the pressing device and the profiling device
  • the transverse profile is set by means of the profiling device.
  • the pressing device and the profiling device thus jointly effect a specific longitudinal profile, the profiling device taking over partial functions of the pressing device.
  • the setting of the longitudinal profile by generating a predetermined mean force from all the individual actuators of the profiling device on the parallelogram body over substantially the entire web width and by optionally generating (that is, if necessary) a predetermined additional force effect of the pressing device on the parallelogram body essentially the entire web width takes place.
  • the above-mentioned predetermined mean force and the optionally generated additional force add up to a required total force.
  • the transverse profile is then adjusted, if necessary, by positive and / or negative deviation of the force effect of one or more individual actuators of the profiling device from said predetermined mean force effect.
  • a pressure hose is again used as the pressing device and a large number of pressure cushions are used as the profiling device
  • the longitudinal profile is adjusted by first applying all the pressure cushions to the same mean pressure and thus causing a certain presetting of the longitudinal profile.
  • the pressure hose is activated, which the required across the entire machine width Applies additional pressure, which is required together with the preset pressure of the pressure pad for a correct setting of the desired longitudinal profile.
  • the pressurization of the pressure pads and the pressure hose described above can of course also be carried out in the reverse order.
  • a transverse profile adjustment can be carried out particularly easily by a positive and / or negative pressure change of individual or several pressure cushions starting from the preset mean pressure, and regulation of both too much and too little applied liquid or pasty medium can take place.
  • the longitudinal and / or transverse profile is set only by means of the profiling device.
  • the profiling device therefore takes over the tasks of the pressing device described above, which can be deactivated or even omitted.
  • the longitudinal profile is adjusted by generating a predetermined force effect from all individual actuators of the profiling device on the parallelogram body over substantially the entire web width, and the transverse profile is set by positive and / or negative deviation of the force effect of one or more Individual actuators from this predetermined force.
  • the longitudinal profile is adjusted by pressurizing all pressure cushions over essentially the entire width of the web and the cross profile is adjusted by a positive and / or negative pressure change of one or more pressure cushions based on the preset pressure.
  • the setting of the longitudinal and / or transverse profile is preferably carried out with the aid of the aforementioned control and / or regulating device of the application unit according to the invention.
  • FIG. 1 shows a schematic cross-sectional illustration of a first exemplary embodiment of the application unit according to the invention for the direct or indirect application of a liquid or pasty medium to a running material web, in particular made of paper or cardboard.
  • the applicator comprises a support beam 2, which extends in its longitudinal direction substantially over the entire width of the material web, as well as a counter roller 4 opposite the support beam 2, the direction of rotation of which is indicated by an arrow.
  • This counter roller 4 can be an application roller for producing an indirect application or a roller carrying the material web, in which case the liquid or pasty medium is then applied directly to the running material web.
  • the doctor element 6 is a doctor blade 6, but the invention is not restricted to this type of doctor element.
  • the squeegee blade 6 is fixed by means of a suitable holding or fastening device 8, which is only indicated in the drawing.
  • a pressure element 12 which is arranged on the support beam 2 and is acted upon directly by a pressure device designed as a pressure hose 10 with a pressure force, with which the doctor blade 6 can be pressed against the counter roller 4 with a predetermined pressure in the region of its doctor blade tip assigned to the counter roller 4 in this way to set the layer thickness or a longitudinal profile of the applied liquid or pasty medium.
  • the pressure element 12 in the view shown in the drawing is designed in cross section as a parallelogram body 12, which has a lower end in a holder 14, which is part of the support beam 2 in the present case , is mounted, and which runs in a neutral position of the doctor blade 6, ie in a position in which the doctor blade 6 is not loaded by the pressing element 10, at a predetermined short distance and essentially parallel to the doctor blade 6. In the present case, this distance corresponds to the thickness of a spacer 16 arranged between the doctor blade 6 and the parallelogram body 12.
  • the parallelogram body 12 has a sandwich-like structure, with two outer plates 12.2, 12.4 running at a distance from one another and essentially parallel and two between the outer plates 12.2, 12.4 arranged and in the vertical direction of the parallelogram body 12 spaced apart and connected to the outer plates 12.2, 12.4 flat pieces 12.6, 12.8, the first flat piece 12.6 in a lower and the second flat piece 12.8 in an upper portion of the parallelogram body 12.
  • the upper and lower edges of the two flat pieces 12.6, 12.8 are flush with the upper and lower edges of the two outer sheets 12.2, 12.4.
  • a material with the material number 1.4310 is used as material for the outer sheets 12.2, 12.4 and a material with the material number 1.4571 for the intermediate pieces 12.6, 12.8.
  • the flat pieces 12.6, 12.8 are glued to the outer sheets 12.2, 12.4 in the present embodiment.
  • the parallelogram body 12 is thus designed as an elastic spring element, against the restoring force of which the pressure hose 10 acts when it is activated, starting from the neutral position of the parallelogram body 12 illustrated in FIG. 1, and which returns to the neutral position when the pressure hose 10 is deactivated by its restoring force.
  • the pressure hose 10 is arranged on the side of the parallelogram body 12 facing away from the counter roller 4 between the parallelogram body 12 and a counter bearing 18 fastened to the support beam 2 and is fixed to the counter bearing 18 via an intermediate piece 20 carrying the pressure hose 10.
  • the arrangement of the pressure hose 10 is selected so that its contact surface 10.2 comes to rest with the upper edge of the parallelogram body 12.
  • the pressure hose 10 is activated by a pressure generating device known per se and not shown in the drawings, the parallelogram body 12 is moved towards the doctor blade 6, as indicated by the dashed thick line in FIG. 1, and contacted in the area of its doctor blade tip associated with the counter-roller 4 K, whereby the doctor blade 6 is pressed against the counter roller 4 with a predetermined pressure.
  • the distance Y of the doctor blade tip to the upper edge of the parallelogram body 12 is approximately 5 to 8 mm.
  • FIG. 2 represents a schematic perspective view of the parallelogram body 12 of the embodiment according to FIG. 1.
  • the component dimensions of the parallelogram body 12 selected for the given exemplary embodiment are such that the thickness D3 of the flat pieces in the present case is substantially greater than the thickness D1, D2 of the outer sheets 12.2, 12.4 is. Since the width of the material web to be coated or the width of the counter-roller 4 is usually several meters in the case of customary application dimensions, the parallelogram body 12 is constructed from a plurality of parallelogram body individual elements 12 of length L1 which are lined up in a similar manner. However, a continuous parallelogram body can also be used. According to FIG.
  • the upper flat piece 12.8 of the parallelogram body 12 is divided into segments over the longitudinal extent of the parallelogram body 12.
  • the subdivision is carried out here by a large number of separating joints 22, which are arranged in the upper flat piece 12.8, are laterally spaced apart and essentially run vertically, and which divides the upper flat piece 12.8 into a large number of laterally adjacent flat piece parts 12.8a, 12.8b ... 12.8x.
  • the outer sheets 12.2, 12.4 framing the flat pieces 12.6, 12.8 do not have such a subdivision, but instead extend continuously over the flat piece items 12.8a, 12.8b ... 12.8x separated from one another by the respective separating joints 22 of the upper flat piece 12.8.
  • the parallelogram body 12 according to the embodiment according to FIGS. 1 and 2 is designed for a maximum line load of 5 N / mm.
  • the line load acting on the parallelogram body 12 is indicated in FIG. 2 by several arrows.
  • FIG. 3a shows a schematic cross-sectional representation of a second exemplary embodiment of the application unit according to the invention.
  • the upper edge of the parallelogram body 12 is provided with an integral support lug 24 which is angled towards the doctor blade 6 and which is in the immediate vicinity of that of the counter roller 4 the associated doctor blade tip can be contacted with the doctor blade 6 and which transmits the pressing forces emanating from the pressure hose 10 directly to the doctor blade 6.
  • the support lug 24 extends essentially at right angles to the vertical direction of the parallelogram body 12. Because of this support lug 24, the lateral distance between the doctor blade 6 and the parallelogram body 12 is greater than in the embodiment according to FIG. 1.
  • FIG. 1 shows a schematic cross-sectional representation of a second exemplary embodiment of the application unit according to the invention.
  • the top of the support lug 24 facing the counter roller 4 is provided with a bevel 26, so that the support lug 24 tapers towards its tip.
  • the support lug 24 is provided with a wear-resistant contact surface 28 in the form of a suitable and, in the present case, rounded metal profile 28 used in the nose tip of the support lug 24 for contacting the doctor blade 6.
  • the upper edge section of the parallelogram body 12 is segmented over its longitudinal extent, so that several tongue-like edge elements R are formed, as can be seen more clearly from FIG. 3b, which is a schematic side detailed view of the one in FIG. 3a shown parallelogram body shows.
  • This subdivision into tongue-like edge elements R essentially corresponds to the subdivision shown in FIG. 2, but the separating joints 22 do not run completely through the upper flat piece 12.8, ie the flat piece sections separated by the separating joint 22 are still connected to one another by the lower edge of the upper flat piece 12.8 , and the parting lines 22 also run through the outer plates 12.2, 12.4 framing the flat pieces 12.6, 12.8.
  • the area of the support lug 24 adjoining the upper edge of the parallelogram body 12 is likewise divided into segments by a continuation of the aforementioned separating joints 22, while the edge of the support lug 24 assigned to the doctor blade 6 is continuous, ie undivided, extends over essentially the entire web width or the width of the counter roller 4.
  • the segment-like subdivision facilitates the setting of a transverse profile of the applied liquid or pasty medium by zone-wise adjustment of the respective segment sections or tongue-like edge sections R of the parallelogram body 12.
  • the applicator comprises, in addition to the pressure hose 10, a profiling device in the form of a central portion of the parallelogram body 12 on its outer surfaces, i.e. on the outer plates 12.2, 12.4 attached heating elements 30, wherein preferably a single heating element 30 is associated with a single segment-like section or tongue-like edge element R of the parallelogram body 12.
  • a profiling device in the form of a central portion of the parallelogram body 12 on its outer surfaces, i.e. on the outer plates 12.2, 12.4 attached heating elements 30, wherein preferably a single heating element 30 is associated with a single segment-like section or tongue-like edge element R of the parallelogram body 12.
  • the pressure hose 10, the parallelogram body 12, its support nose 24 and the doctor blade 6 are arranged with respect to one another in such a way that the vector of the pressure force emanating from the pressure hose 10 through the contact point K support nose-doctor blade and in the in FIG. 3a shown neutral position of the parallelogram body 12 is substantially perpendicular to its vertical extent.
  • the vector of the pressing force thus runs essentially along the horizontal dash-dotted line shown in FIG. 3a.
  • the flow of force from the pressure hose 10 runs linearly through the support lug 24 of the parallelogram body 12 and over the Contact point K support nose squeegee blade to squeegee blade 6.
  • the direction of the force vector does not change direction when the pressure hose 10 is activated, but is at most minimally displaced in parallel in the vertical direction without resulting in a force component acting in the vertical direction.
  • FIG. 4 shows a schematic cross-sectional illustration of a third exemplary embodiment of the application unit according to the invention.
  • the support lug 24 of the parallelogram body 12 is designed as a separate component which is fixed on the upper free edge of the parallelogram body 12.
  • the support lug 24 comprises a claw-like section 24.2 which surrounds the upper edge of the parallelogram body 12 and thus fastens the support lug 24 to the parallelogram body 12.
  • FIG. 5 shows a schematic cross-sectional illustration of a fourth exemplary embodiment of the application unit according to the invention.
  • the basic structure of this modification corresponds essentially to that according to FIG. 4, in contrast to this, however, the pressure hose 10 is fastened to the rear side of the support nose 24 facing away from the doctor blade 6.
  • the fixation takes place via a C-shaped profile section 24.4 provided in the back of the support nose, which corresponds to a corresponding edge section 10.4 of the pressure hose 10 and thus acts as an adapter for establishing a connection with the pressure hose 10.
  • FIG. 6 shows a schematic cross-sectional illustration of a fifth exemplary embodiment of the application unit according to the invention.
  • This embodiment corresponds essentially to that according to FIG. 3, however, in contrast, it uses a pressing device which at the same time can perform the function of a profiling device for setting a transverse profile of the applied liquid or pasty medium or vice versa.
  • the pressing device acting on the parallelogram body 12 is formed from a multiplicity of pressure cushions 32 which are arranged laterally next to one another and can be contacted with the upper edge section of the parallelogram body 12 and which can be actuated as a function of and / or independently of one another.
  • a single pressure pad 32 is preferably assigned to a segment-like section of the support lug 24 or a tongue-like edge element R of the parallelogram body 12.
  • a contact pressure which acts directly on the parallelogram body 12 and which is locally limited in sections is exerted in the region of the upper edge of the parallelogram body 12 and is transmitted to the doctor blade 6 via the tip of the support lug 24. This allows both a desired longitudinal profile and a desired transverse profile of the applied liquid or pasty medium to be set. The same result can be achieved by deactivating one or more pressure pads 32.
  • all pressure pads 32 can be activated and applied with the same pressure, so that pressure pads 32 exert a predetermined, uniform force on parallelogram body 12 over substantially the entire web width.
  • the setting or regulating of the transverse profile is then carried out on the basis of the predetermined force, ie the predetermined same pressure a positive and / or negative pressure deviation of one or more pressure pads 32 can be realized.
  • a negative pressure deviation of an individual pressure pad 32 can also take place here by completely deactivating this pressure pad.
  • the application is also designed in this embodiment so that the vector of the profiling device 32, i. of the pressing device 32, which acts as a profiling device, and which is associated with a specific partial section of the parallelogram body 12 and which is applied by the contact point K supporting nose squeegee blade and in the neutral position of the parallelogram body 12 shown in FIG. 6, extends essentially at right angles to its vertical extension.
  • the vector of the profiling device 32 i. of the pressing device 32, which acts as a profiling device, and which is associated with a specific partial section of the parallelogram body 12 and which is applied by the contact point K supporting nose squeegee blade and in the neutral position of the parallelogram body 12 shown in FIG. 6, extends essentially at right angles to its vertical extension.
  • FIG. 7 shows a schematic cross-sectional illustration of a sixth exemplary embodiment of the application unit according to the invention.
  • the pressing device responsible for setting the longitudinal profile of the applied liquid or pasty medium is designed separately from the profiling device for setting the transverse profile.
  • a pressure hose 10 in the configuration already explained in connection with FIGS. 1 and 3 is again used as the pressing device.
  • the pressure pads 10 already explained in connection with FIG. 6 serve as profiling device for setting the cross profile, but these now act on the parallelogram body 12 in a central section thereof.
  • a variant can also be carried out in which the arrangement is exactly opposite to that shown in FIG. 7, ie the pressure pads 32 are in a position comparable to FIG. 6, while the pressure hose 10 serving as a pressing device is in a central section of the parallelogram body 12 attacks on this.
  • the embodiment according to FIG. 7 is particularly suitable for the two process variants explained below for setting the longitudinal and / or transverse profile of the applied liquid or pasty medium.
  • the longitudinal profile is set exclusively by means of the pressure hose 10 and the transverse profile is set exclusively by means of the pressure cushions 32.
  • the pressure hose 10 is subjected to a predetermined pressure which has a predetermined uniform force effect on the parallelogram body over essentially the entire web width 12 exercises and thus sets the desired longitudinal profile of the applied liquid or pasty medium.
  • the pressure pads 32 can initially be kept in a depressurized state. If adjustment or regulation of the cross profile becomes necessary, however, one or more pressure cushions 32 are activated from their pressure-less state by pressurization and thus produce a positive force effect on the parallelogram body 12, which is locally added to the predetermined force effect of the pressure hose 10.
  • the longitudinal profile is adjusted jointly by the pressure hose 10 and the pressure cushion 32, while the transverse profile is adjusted exclusively by means of the pressure cushion 32.
  • all pressure pads 32 are first subjected to the same predetermined mean pressure and thus bring about entire web width a certain presetting of the longitudinal profile.
  • the pressure hose 10 is activated, which applies a uniform additional pressure over the entire machine width, which together with the predetermined mean pressure of the pressure pads 32 ensures a correct final setting of the desired longitudinal profile.
  • the predetermined average pressure of the pressure pads 32 and the additional pressure applied by the pressure hose 10 thus add up locally to an overall effect.
  • the activation of the pressure pads 32 and the pressure hose 10 described above can of course also be carried out in the reverse order.
  • a transverse profile adjustment is achieved by a positive and / or negative pressure change of one or more pressure pads 32, starting from the preset mean pressure, wherein regulation of both too much and too little applied liquid or pasty medium can be realized. It is of course also possible for individual pressure pads 32 to keep their preset mean pressure constant in the case of a transverse profile adjustment.
  • FIG. 8 shows a schematic cross-sectional illustration of a seventh exemplary embodiment of the application unit according to the invention.
  • the basic structure of this modification is essentially the same as the embodiment according to FIG. 7.
  • a multiplicity of double-acting pneumatic cylinders 34 are used.
  • the cylinder rods 34.2 of the respective pneumatic cylinders 34 can be connected to the parallelogram body 12 (for example via a suitable coupling member), ie the application of compressive as well as tensile forces is possible or not, which then only allows the transmission of compressive forces.
  • FIG. 1 shows a multiplicity of double-acting pneumatic cylinders 34 .
  • FIG. 9 which shows a schematic diagram of the arrangement of the plurality of double-acting pneumatic cylinders 34 1 to 34 n in a schematic plan view
  • the one printing side (for printing p1) of a respective one of the cylinders 34 1 to 34 n is connected to a separate pressure line 36 1 to 36 n
  • the other pressure side (for a pressure p2) of all cylinders 34 1 to 34 n is connected to a common pressure line 38.
  • the pressure lines 36 1 to 36 n and 38 are connected to a control and regulating device 40 and via this in turn to pressure sources 42, 44.
  • the cylinders 34 1 to 34 n can each be addressed individually on their p1 pressure side and jointly on their p2 pressure side. The following operating methods are possible, for example, for setting a longitudinal and / or transverse profile.
  • Pressure hose 10 deactivated Longitudinal profile setting by specifying the pressure p1 on all cylinders 34 1 - 34 n and cross-profile setting by increasing or decreasing the pressure p1 on one or more of the cylinders 34 1 - 34 n .
  • Pressure hose 10 deactivated; Specification of a pressure p1 and a pressure p2 on all cylinders 34 1 - 34 n ; Longitudinal profile adjustment by moving all cylinders 34 1 - 34 n forward or backward using one uniform change in pressure p1 and / or p2; Cross profile adjustment by changing the pressure p1 and / or p2 on one or more of the cylinders 34 1 - 34 n .
  • control strategies I-IV mentioned above being understood only as an example. It is also possible to implement other modes of operation, for example by activating the pressure hose 10 in the above mode IV, etc.
  • the double-acting cylinders 34 additionally allow all cylinders to be returned to a stand-by position or, in the case of an unpressurized system, to maintain a specific cross-section presetting.
  • the application unit comprises a control and / or regulating device for the controlled adjustment of the pressing forces of the pressing device and / or (as already explained in connection with FIG. 9) of the profiling device for longitudinal and / or transverse profiling.
  • This control and / or regulating device is not shown in FIGS. 1-8 for the sake of clarity.
  • the parallelogram body can consist of at least three individual parts articulated to one another, two individual parts of equal length, spaced parallel to one another and articulated at their respective lower ends to one of two bearing points arranged at a predetermined distance from one another, and of which the third individual part connects the first two individual parts in an articulated manner at their upper ends, the length of the third individual part measured between the upper articulation points corresponding to the distance between the two bearing points of the first two individual parts.
  • the parallelogram body can also take on more compact cross-sectional shapes.
  • any other suitable materials can also be used for the production of the parallelogram body.
  • any suitable fastening device can be used to fasten the parallelogram body to the supporting beam or to a component assigned to the supporting beam.
  • individual actuators other than the pneumatically actuated pressure pads can also be used for a profiling device for setting a transverse profile of the applied liquid or pasty medium or for a pressing device performing the functions of such a profiling device.
  • Such individual actuators can, for example, also be mechanical, pneumatic, hydraulic, electrical, magnetic, electromagnetic, thermal, electrothermal actuators and the like, as well as combinations thereof.

Landscapes

  • Coating Apparatus (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP97107886A 1996-05-20 1997-05-14 Dispositif d'application pour l'application directe ou indirecte d'un liquide ou d'une pâte sur une bande en défilement Withdrawn EP0808668A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620261A DE19620261A1 (de) 1996-05-20 1996-05-20 Auftragwerk zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn
DE19620261 1996-05-20

Publications (2)

Publication Number Publication Date
EP0808668A2 true EP0808668A2 (fr) 1997-11-26
EP0808668A3 EP0808668A3 (fr) 1998-04-01

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EP97107886A Withdrawn EP0808668A3 (fr) 1996-05-20 1997-05-14 Dispositif d'application pour l'application directe ou indirecte d'un liquide ou d'une pâte sur une bande en défilement

Country Status (5)

Country Link
US (1) US5932010A (fr)
EP (1) EP0808668A3 (fr)
JP (1) JPH1095565A (fr)
BR (1) BR9702950A (fr)
DE (1) DE19620261A1 (fr)

Cited By (1)

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EP2680980B1 (fr) 2011-03-03 2020-12-02 Mattssonföretagen I Uddevalla Aktiebolag Procédé et dispositif de dosage et revêtement

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DE19740952A1 (de) * 1997-09-17 1999-03-18 Voith Sulzer Papiermasch Gmbh Auftragwerk zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn
US6139638A (en) * 1998-01-27 2000-10-31 Thermo Web Systems, Inc. Fluid assisted doctor
DE19812929A1 (de) * 1998-03-24 1999-09-30 Voith Sulzer Papiertech Patent Vorrichtung zum Egalisieren oder/und Dosieren einer auf einen Untergrund aufgebrachten Schicht eines flüssigen oder pastösen Auftragsmediums
WO2008018530A1 (fr) * 2006-08-09 2008-02-14 Asahi Kasei Chemicals Corporation Procédé de production et dispositif de production de substrat d'impression cylindrique

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WO1993005887A1 (fr) * 1991-09-25 1993-04-01 Btg Källe Inventing Ab Dispositif et procede servant a enduire une bande en mouvement

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US4732776A (en) * 1987-02-24 1988-03-22 Measurex Corporation Apparatus and method for controlling the thickness of coatings on paper or other materials
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FI100313B (fi) * 1991-05-09 1997-11-14 Valmet Corp Menetelmä ja laite liikkuvan alustan päällystämiseksi
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Publication number Priority date Publication date Assignee Title
US3783781A (en) * 1971-09-20 1974-01-08 S Grommek Doctor blade control mechanism, particularly for use in printing presses
WO1993005887A1 (fr) * 1991-09-25 1993-04-01 Btg Källe Inventing Ab Dispositif et procede servant a enduire une bande en mouvement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2680980B1 (fr) 2011-03-03 2020-12-02 Mattssonföretagen I Uddevalla Aktiebolag Procédé et dispositif de dosage et revêtement

Also Published As

Publication number Publication date
JPH1095565A (ja) 1998-04-14
EP0808668A3 (fr) 1998-04-01
US5932010A (en) 1999-08-03
BR9702950A (pt) 1999-06-08
DE19620261A1 (de) 1997-11-27

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