• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:FI12962Y1
    申请号:FIU20214017U
    申请日:2021-02-09
    公开日:2021-05-26
    发明作者:Christoph Henninger
    申请人:Voith Patent Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a curtain nozzle having a nozzle body and a nozzle lip for applying at least one liquid or paste-like coating material to a web of material. WO 2004 001133 A2 discloses a coating or drying device with two coating devices for driving a material web, in particular of paper or paperboard, which is opposite to each other, for coating a liquid or paste coating material. The coating agent is, for example, a pigment-containing coating paste, a starch solution or also a barrier agent which is coated without contact. In this case, a non-contact lifting device, for example a curtain baling device, can be used. Coating the medium with such a non-contact coating device is also called - curtain coating. The coating takes place directly or also indirectly by first dispensing the medium onto a coating roll and transferring it from this roll to the web of material in the treatment nip. The document does not provide information on the temperature range in which the coating device can be used.
    - The nozzles known hitherto used in such a curtain coating device can only be utilized in a very narrow temperature range in order to maintain the uniformity of the outlet gap in the machine width. The coating materials are fed rather cold, for example in the range of 25-30 ° C, and the nozzles are protected from the environment in hoods or air-conditioning chambers, which in turn are ventilated and / or ventilated.
    S 25 N DE 10 2016 209 336 A1 also discloses a coating head for a curtain coating apparatus x for coating a moving fibrous web. The coating head may comprise, in particular, a nozzle body block of metallic material provided with a N transverse distribution chamber and a nozzle gap, the nozzle body block being surrounded by at least S30 - partially an outer jacket and / or a thermal insulating layer in contact with the environment N. The heat insulating layer is, for example, a foam material and / or a honeycomb structure S and / or contains glass wool and / or mineral wool. The purpose of the insulation is to prevent moisture from condensing in the nozzle when using a cold medium. The heating of the coating head takes place only from the outside. It is an object of the present invention to provide a curtain nozzle which can also be used at high medium temperatures, for example at temperatures of at least 70 ° C, when - the medium temperature must be maintained. Alternatively or in addition, it is intended to dispense with providing a casing for the curtain nozzles.
    This object is achieved according to the invention as set out in claim 1.
    Advantageous further developments are shown in the sub-requirements.
    An application is preferred in which the curtain nozzle can be heated by the coating agent itself, wherein the coating agent is preheated before the curtain nozzle flows in. In this case, care is taken to preheat the coating agent to a temperature a few degrees higher before it flows into the curtain nozzle, so that it has an optimum temperature for adhering to the material web when applied to the material web.
    It is likewise provided that the curtain nozzle is provided with at least one heater or that a heater is arranged upstream of the curtain nozzle in the flow direction of the coating agent. In both cases, the coating material is also heated together with the curtain nozzle.
    S 25 An electric heater configured, for example, as an N resistance heater or an inductive heater is particularly suitable as the heater.
    3 I The heater can be configured in different ways; the heater preferably comprises a N heating wires arranged in a plane or in bundles.
    S 30 N Alternatively or in addition to the heater, heating ducts can be installed or set on or in the nozzle body S. When the heating channels are set on, they consist, for example, of plate elements welded on.
    The medium, especially water or oil or other liquid, preferably flows through the heating channels so that the entire curtain nozzle reaches the desired operating temperature in a short time. The heating channels preferably include a pump. In such a case, it is sufficient if a heater is arranged close to the pump to heat the entire curtain nozzle or if the heater is integrated in the pump. Maintaining the target temperature of the curtain nozzle or the target temperature range of the curtain nozzle - is facilitated if this is at least partially thermally insulated to the outside. Preferably, it is also provided that the nozzle lip is provided with an arrangement for rinsing with warm air or other warm gas to prevent condensation of moisture.
    The invention also relates to a coating head in a curtain coating apparatus for coating a web of material with at least one liquid or paste coating material, wherein the coating head comprises at least one cutting edge extending substantially the width of the coating head, where the coating material exits the coating material. The coating head according to the invention is characterized in that it has a plurality of curtain nozzles arranged side by side along the cutting edge, transverse to the direction of travel of the material web, with circular openings to form a common cutting edge S 25, as described above, or that the coating head has at least N transverse , with a slit-like opening x provided with means for heating its respective nozzle body.
    E N This at least one cross-sectional curtain nozzle is S 30 - preferably formed to produce a multilayer free-falling curtain. N For this purpose, several separate supply lines for different coating materials S are arranged inside the nozzle. Also in this case, heaters are provided or the coating materials are preheated before entering the nozzle.
    The invention can also be applied to a method of coating a web of moving material with at least one liquid or pasty coating material by means of a plurality of nozzles by forming a common cutting edge or by means of a coating head = with at least one cross-sectional curtain nozzle with a slit-like opening to form a cutting edge. The method is characterized in that the coating material is heated before entering the nozzles or the curtain nozzle or inside the nozzle or inside the curtain nozzle.
    - It is also an advantage of the invention that the use of enclosures can be dispensed with. The field of application of curtain nozzles is expanding, because curtain nozzles can be used especially at high medium temperatures.
    High medium temperatures are common in starch applications, for example in the range of 50-70 - * C, possibly up to 80 ° C for packaging papers, or also for sealants, for example, to give them lower viscosity and consequent more flowability and to cope with less drying in the next coating drying equipment.
    - The invention is based on the nozzle being actively heated. This is not necessary when using cold media as disclosed in DE 10 2016 209 336 A1. According to the invention, a nozzle is provided which can be used in barrier or starch coatings which operate at clearly higher medium temperatures.
    S 25 N The nozzle according to the invention is suitable for direct or indirect x coating of a coating material on a fibrous web.
    E N The nozzle can be advantageously used for the coating of starch solutions or sealants S 30, which are prepared, for example, on the basis of polyvinyl alcohols (PVA).
    In particular, an embodiment of the invention is preferred, according to which bore holes for the heating medium are provided inside the outer jacket or in the outer jacket or in the nozzle body block of the nozzle. In this way, the nozzle is passively heated so that the fluid medium heated in another location flows inside the nozzle body of the nozzle or through boreholes mounted in the nozzle body.
    5 Alternatively, the nozzle is heated. This means that heating channels have been installed or machined inside the nozzle or that heating means have been installed or machined outside the nozzle, for example grooves or other recesses have been milled on the outer surface of the nozzle. Alternatively, plate ducts are welded on top or through-bore holes, pipelines or pipe bundles are used.
    Indirect heating of the nozzle is provided by fluids, such as in particular water or other liquids suitable for heat transfer, such as oil, etc., which are pumped through the heating channels; alternatively or in addition, however, the coating agent, which first flows through the heating channels and only then enters the distribution chamber with the nozzle outlet, is also heated separately. The coating material is preferably already heated before it enters the nozzle body.
    All the measures listed above can be combined. The measures are preferably combined with at least partial or preferably complete - isolation of the nozzle. It is also preferred to use symmetrically assembled nozzles which, when controlled by heat or heating, deform uniformly and thus produce a uniform nozzle gap. S 25 N Another advantageous measure is that the measures described above are combined x with a fluid rinsing of the nozzle lip, - in particular with an air rinsing, so that - condensation I is certainly prevented therein, especially when the humidity is high. a
    N S 30 - The invention will be described in more detail below = by means of embodiments with the aid of the following N drawings. They include:
    Fig. 1 shows a schematic view of a curtain nozzle with boreholes for heating medium and planar heating wires, Fig. 2 shows a schematic view of a curtain nozzle with welded heating channels, Fig. 3 shows a schematic view of a curtain nozzle with boreholes for insulating material, Fig. 4 shows a schematic view of a curtain nozzle with welded heating channels, an insulating cover and an arrangement for gas purging, and Fig. 5 shows a schematic view of a coating head for producing a multilayer free-falling curtain, which is also provided with heating channels.
    The curtain nozzle 20 (Figure 1) has a nozzle body 21 with bore holes 22 for the heating medium and / or internal heating wires 23. Coating material is fed from the central feed 25 to a nozzle 26 with a nozzle slot.
    The coating material - is heated by means of heating wires 23 and / or a heated medium flowing through the boreholes 22 to the desired temperature and exits the nozzle 26 at the desired temperature through a slit-like opening up to the nozzle lip 32.
    Instead of the boreholes 22 and / or the O 25 heating wires 23 inside, the curtain nozzle 20 '(Fig. 2) has channels 27, 28 placed outside the nozzle 20', for example welded on N, through which the heating medium can be passed.
    Alternatively, instead of the ducts 2 27, 28, heating wires can also be installed to heat the nozzle body I 21. a Nn S 30 - Another curtain nozzle 20 * (Fig. 3) shows a modification of the nozzle 20 of Fig. 1. N Fig. 3 further provides an insulating shell 29. The rinsing device 30 is arranged on both sides of the nozzle 26 inside the wall 31.
    The rinsing device 30 blows air - or possibly also heated by a heater - in the direction of the nozzle 26 so that the air flows along the nozzle lip 32 and prevents moisture from condensing on the nozzle lip 32. In another embodiment (Fig. 4) the curtain nozzle 20 is also provided with a rinsing device 30 Additional heating channels are installed on the side of the nozzle body 21. Also in this case, a rinsing device 30 is provided inside the wall 33, from which warm air flows in the direction of the nozzle lip 32. The coating head 1 (Fig. 5) is characterized in that the housing block has - in addition to the front and rear part 10 ', 11' of the housing block, a central part 18 of the housing block and two transverse distribution chambers 3.1 and 3.2 with their respective nozzle slots 4.1, 4.2 facing the outlet 5 to produce a two-layer free-falling curtain 2 '. Means 22, 23 for heating the nozzle body can in this connection be provided in one or more housing block parts 10, 11 °, 18. In Fig. 5, means 22, 23 for heating are provided in all housing block parts 10 ', 11', 18. The supply of both cutting edges 6, 7 and the thermal insulation of the housing block 10 ', 11 °, 18 are solved as in the embodiment of Fig. 3, namely supplying the first cutting edge 6 with the first rinsing device 8 and feeding the second cutting edge 7 , 14 are in each case led from the upper part of the housing block 10 ', 11, 18 in the gap between the outer jacket 12.1 or 12.2 in the flow direction from above to below. The outer jacket 12.1, 12.2 can then be made entirely or partially of an insulating shell 29. The housing block parts 10 '11 ° and 18 are provided with S 25 - in each case with boreholes for the flow of heating fluid. In alternative N implementations, such a multiple nozzle can also be implemented in the same way as the nozzles shown in Fig. 1 and x in Fig. 2. The outer jacket 12.1, 12.2 can then be omitted, as can the rinsing devices 8, 9. In addition, it has also been possible to provide the multiple nozzles, as shown in Fig. 2, outside the channels 27, 28 through which the heating medium S 30 - can be passed. Alternatively, instead of the ducts 27, 28, it is also possible to install N heating wires for heating the nozzle body 21.
    N 5
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    权利要求:
    Claims (12)
    [1]
    Curtain nozzle (20, 20 ', 20%, 20) with a nozzle body (21) and a nozzle lip (32) - for applying at least one liquid or pasty coating material to a web of material, characterized in that means are provided for the curtain nozzle (20, 20'). 20 “, 20%) to heat the nozzle body (21).
    [2]
    Curtain nozzle (20, 20 ', 20 ", 20) according to Claim 1, characterized in that the curtain nozzle (20, 20', 20", 20 *) can be heated by the coating material itself, the coating material being preheated before the curtain nozzle (20, 20 ', 20 “, 20 *) inflow.
    [3]
    Curtain nozzle (20, 20 ', 20 ", 20) according to protection claim 1 or 2, characterized in that the curtain nozzle (20, 20', 20", 20) is provided with at least one heater or - in the flow direction of the coating material before the curtain nozzle (20, 20 °, 20%, 20) a heater is provided and the coating material can be heated by means of a heater.
    [4]
    Curtain nozzle (20, 20 ', 20 ", 20 *) according to Claim 3, characterized in that the heater is an electric heater, in particular a resistance heater or an inductive LÖ heater.
    N I
    [5]
    Curtain nozzle (20, 20 ', 20 ", 20%) according to protective claim 4, a. Characterized in that the heater comprises heating wires (23) arranged in a plane or in S bundles.
    Curtain nozzle (20, 20 ', 20 ", 20 *) according to one of the protection requirements 1 to 5,
    characterized in that heating channels (27) are mounted or arranged on the nozzle body (21) or on the nozzle body (21).
    Curtain nozzle (20, 20 ', 20%, 20 *) according to Claim 6, characterized in that the medium, in particular water or oil, flows through the heating channels (27).
    Curtain nozzle according to Claim 7, characterized in that a pump is connected to the heating channels (27).
    Curtain nozzle (20, 20 ', 20 ", 20) according to one of Claims 1 to 8, characterized in that the curtain nozzle (20, 20', 20", 20 ") is at least partially thermally insulated outwards.
    Curtain nozzle (20, 20 °, 20 ", 20 *) according to one of Claims 1 to 9, characterized in that an arrangement (30) is provided on the nozzle lip (32) for rinsing with warm air or other warm gas to prevent condensation.
    11. - Coating head (1) in a curtain coating apparatus for coating a material web N with at least one liquid or paste-like coating material, N wherein the coating head (1) comprises at least one cutting edge extending from the coating head that the coating head has a plurality of N 30 curtain nozzles (20, 20 ', 20 ", 20) according to protection requirements 1 to 10 arranged side by side along the cutting edge, transverse to the direction of travel of the material web, with round openings to form a common cutting edge, or that the coating head there is at least one cross-sectional curtain nozzle (20, 20 °, 20 ", 20 *) with a slit-like opening provided with means for heating its respective nozzle body.
    Coating head according to protective claim 11, characterized in that at least one curtain nozzle (20, 20 °, 20 ", 20 *) extending in one section in the transverse direction is formed to produce a multilayer free-falling curtain.
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    同族专利:
    公开号 | 公开日
    DE202020107431U1|2021-01-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
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