• 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:
    The invention relates to a method and a system for applying at least one substance layer (C) in the form of foam to a moving fiber web (W) through at least one opening of at least one nozzle (15) of an application unit. The substance (C) is flown from the nozzle orifice (15) onto a guide surface (20), from which the guide surface (20) the substance (C) is flowed to a target surface, and one end of the guide surface (20) is in Contact with the target area, to which the substance is applied, arranged.
    公开号:AT519414A2
    申请号:T50996/2017
    申请日:2017-12-01
    公开日:2018-06-15
    发明作者:Pietikäinen Reijo；Pitkäniemi Tapio
    申请人:Valmet Technologies Oy；
    IPC主号:
    专利说明:

    Method and system for applying a substance layer to a moving fiber web by means of foam application
    The invention relates to a method and a system for applying a substance layer to a moving fiber web by means of foam application. In particular, the invention relates to a method according to the preamble of claim 1 and a system according to the preamble of claim 7.
    As is known in the art, processes for making a fibrous web typically include an assembly formed by a plurality of devices sequentially arranged in the process line. A typical manufacturing and treatment line comprises a headbox, a wire section and a press section and a subsequent drying section and a rewinder. The manufacturing and processing line may further comprise other devices and parts for finishing the fibrous web, for example a size press, a calender and a coating section. The manufacturing and treatment line also comprises at least one winder for forming customer rolls and a roll wrapping device. By this description and the claims which follow, by fibrous webs is meant, for example, paper and board or paperboard webs.
    In the manufacture of fibrous webs, for example paper or board webs, various substances are added to the fibrous web to achieve the desired end-use properties of the fibrous web. In particular, the strength and absorption properties of fibrous webs can be improved by using sizing by applying sizing agents, such as starch or other adhesive chemicals, to the web at the wet or dry end of the web production line.
    In the coating process, a mixture of pigments and binders, usually starch, is typically applied to the web as a single layer. In the coating process, one or more layers of a coating color, i. H. a mixture of pigments, binders and other additives applied to the top of the web surface. The main purpose of the coating is to improve the appearance and printability of the web by creating a smooth, flat and opaque surface.
    Typically, a coating device - a coater - is used in the coating of a fibrous web, and a sizing press is used in sizing. In conjunction with the
    Coaters and size presses use different types of application technologies to apply the substance to the fiber web, for example, curtain technology or blade technology or film transfer technology, or spray technology or foam technology. The different application technologies and methods have different operating characteristics and operating windows. In particular, different application methods specify different requirements both with regard to the physical properties and the application quantities of the applied substance. The present invention relates to a foam application technology.
    It is known in the art to use foam application in a sizing or coating process to apply a substance to a web, particularly in connection with the manufacture of nonwoven products. A foam coating system typically includes a mixing device, a pumping device, a foam device, a conduit system and an applicator unit. Foaming is based on strong blending to add air into the liquid-based substance with a surface treatment agent, resulting in a substantial increase in specific volume, thus making handling and application of the coating substance much easier at low dry coating weights. The applicator unit typically has a nozzle or nozzles for extruding the foam onto the web.
    The foam application process is a robust and simple application process and it can also be applied by the same substances to a moving fiber web, the solid particles and / or
    Coating paint or sizing agent having a high viscosity. Typically, in foam application, a slot applicator, i. H. an applicator unit having a slit die or slit dies which, when applied directly, are located very close to the fibrous web and in indirect application to the surface of the roll or fabric; the distance of the application, d. H. the distance of the nozzle tip from the surface of the fibrous web was typically about 0.2 - 5 mm, which is very difficult for various reasons. First, the small distance between the nozzle tip and the surface of the web makes control of the amount of applied substance and flatness very difficult. The flow of the applied substance is very sensitive to the distance of the nozzle from the web and therefore requires exact control of the flow. A small distance of the nozzle from the web also requires very precise control and adjustment of the nozzle position. Furthermore, a deviation in the web thickness or in the nozzle position, for example due to machine vibrations, can cause changes in the distance of the nozzle from the web and thus deviations in the amount of applied substance. Too low an amount of feed will cause interruptions in the application and an excessive amount will result in excess extrusion and accumulation of the substance to be applied around the applicator nozzle. The small distance can also lead to problems in Bahnabisssituationen during the manufacturing process.
    DE Patent Application Publication 199 41 194 discloses a method for coating a moving web of paper or board with a substance which is applied as a foam and maintains its foam structure in the finished coating and which has a covering layer of a non-foamed substance. The substance is foamed mechanically or chemically. The substance is glue and / or starch and / or a pigment-containing dispersion and / or offset coating colors and / or low-pressure coating colors. The orders to the moving web is carried out directly or indirectly, for example by means of an applicator roll. According to one example of this known method, the foam is applied through a nozzle into an application chamber delimited in the direction of movement on one side by a nozzle frame and on the other side by a doctor blade. In the application chamber, the foam is in a pressurized state and thus a portion of the foam is extruded from the application chamber also in the opposite direction of the direction of movement of the fiber web and must be removed separately. This known method is also very sensitive to the balance between the amount of foam added, the pressure and the speed of movement of the fibrous web. The application chamber is also located below the fibrous web, which may result in the dripping of the foamed substance and therefore requires cleaning to maintain the device and its environment in operating conditions.
    An object of the present invention is to provide a method and system for applying a layer of a substance to a moving fibrous web, in particular a paper or board web, using foam application which overcomes the disadvantages of the prior art at least minimized.
    A particular object of the invention is to provide a method and system for applying a substance layer to a moving fibrous web, in particular a paper or board web, using foam application, wherein the disadvantages and problems relating to the extrusion of foam in the opposite direction to the direction of movement of the fibrous web and with respect to an excessively delicate balance between supplied amount of foam, pressure and moving speed of the fibrous web are eliminated or at least minimized.
    Another object is to provide a method and a system for applying a substance layer to a fibrous web, in which the substance is applied in the form of a foam and in which the flatness and the weight of the finally applied substance layer can be precisely controlled and which method also applicable in cases where small amounts of dry solid are to be applied within the substance.
    It is a further object to provide a method and system for applying a layer of substance to a moving fibrous web which reduces requirements in terms of positional accuracy as well as mechanical tolerances and mechanical properties of components of the system, particularly nozzles and rolls of the system can be.
    Another objective is to eliminate, or at least minimize, potential problems with respect to runnability and maintenance issues, particularly related to nozzles positioned too close to the fiber web, for example, problems with the fiber web contacting the nozzle tip and problems of fiber web aggregation in the nozzle area and possible damage to the nozzle or other components in Bahnabrisssituationen.
    In order to achieve the above-mentioned objects and objects and those which will become clear later, the method according to the invention is mainly characterized by the features of claim 1. The system according to the invention is mainly characterized by the features of claim 7. Advantageous aspects and features of the invention are set forth in the dependent claims.
    According to the invention, the foamed substance is applied through the nozzle opening of the application unit to a guide surface on which the foamed substance is in the ambient pressure. The edge of the rim, d. H. one end of the baffle is disposed in contact with the target surface, wherein the target surface is the surface of the fibrous web or a surface of a roll or a surface of a fabric or a surface of a belt or a surface of a sump, the substance being applied to the target surface , During the time in which the foamed substance flows on the guide surface, it has time to equalize with the ambient pressure and to expand accordingly. At the point of application, d. H. At the point where the foamed substance is transferred from the guide surface to the target surface, the foam has already equilibrated with the ambient pressure and therefore there is little or no expansion so that a lesser flow of the foamed substance in the opposite one The amount applied and the amount applied is less sensitive as to the spacing of the plot and the speed of movement of the fiber web and is generally the required one
    Balance parameters can be achieved more easily. According to an advantageous embodiment of the invention, the substance is on the guide surface in the ambient pressure.
    According to the invention, the foamed substance is transferred from the guide surface to the moving fiber web in direct application to the moving fiber web or by indirect application over a rotating roll surface or over a moving fabric or via a moving belt or via a sump Transfer fiber web.
    According to the invention, the treatment substance is applied to the target surface via a conductive surface and one end of the conductive surface is in contact with the surface to which the substance is applied. Thus, the foamed treatment substance has time to equilibrate and form a continuous, smooth substance layer as it flows on the baffle.
    According to an advantageous development of the invention, the treatment substance to be applied by means of the application unit is coating ink or sizing agent. The method and system according to the invention may also be used in conjunction with applying a coating color layer to a fibrous web for printed products or in connection with sizing on a fibrous web and in conjunction with forming a film, a membrane or a lacquer layer, for Example when processing or converting products.
    According to an advantageous development of the invention, the guide surface is flexible, such as a thin metal plate, a thin plastic plate, a thin composite structure or another flexible structure.
    According to an advantageous embodiment of the invention, the one end of the guide surface is bent into a dragging or sliding contact with the surface.
    According to an advantageous development of the invention, the nozzle is a slot nozzle extending essentially over the entire width or a curtain or jet-type nozzle or jet nozzle.
    According to an advantageous development of the invention, the nozzle is designed as a distribution channel structure, which has a plurality of spaced apart openings arranged on substantially the entire width of the fiber web, wherein the treatment substance is passed from the openings to the guide surface.
    According to an advantageous development of the invention, the system has a scraper device arranged in the direction of movement downstream of the guide surface for smoothing the applied substance layer.
    According to an advantageous embodiment of the invention, the guide surface is arranged such that the flow of the substance is in a downward slope with respect to the surface to which it is applied.
    According to an advantageous development of the invention, the roller is a hard roller having a ceramic or metallic surface.
    The flow of the applied substance is directed by a baffle by which it is applied to the surface of the fibrous web in a direct application or to the surface of the roll or the surface of the fabric or the surface of the belt by which the substance is applied to the surface of the fibrous web directed to an indirect application or to a sump formed between a pair of rollers or a pair of a roller and a fabric or a belt, or a pair of two belts or a pair of two fabrics forming a nip, wherein the fiber web passes through the nip.
    According to an advantageous development, the system is arranged in a wire section or a press section or a dryer section or a glue section or a coating section or a calendering section of a fiber web production line. For example, the system may be used to suture the fibrous web in the wire section or in the press section or at the size section or coating section to apply a size or coating or humectant or other agent that affects the properties of the fiber web.
    According to an advantageous development, the system has two rollers, which form a nip between them, wherein in the nip air is removed from the foam structure and the treatment substance is pressed to the fiber web.
    According to the invention, at least one layer of the substance in the form of the foam can be applied to the fibrous web on one side or two sides.
    According to an advantageous embodiment of the invention, a support surface is used on the other side of the fibrous web in a one-sided order. The support surface may preferably be a roller or a cylinder. The support surface may also be a fabric or a wire or belt or a moving support surface or a non-moving support member.
    The invention achieves a robust and simple application of a treatment substance in which the substance is applied in the form of a foam, and in which the flatness and the weight of the ultimately applied substance material layer exactly, and in which the method with low applied amounts of dry solid substance applicable is and with which also substances can be applied without contact, having solid particles and / or coating color or sizing agents with high viscosity.
    In the following, the invention will be described in more detail with reference to the accompanying drawings, in which:
    Fig. 1 shows schematically an advantageous example of the invention;
    Fig. 2 shows schematically a further advantageous example of the invention;
    Fig. 3 shows schematically a further advantageous example of the invention;
    Fig. 4 shows schematically a further advantageous example of the invention; and
    Fig. 5 shows a further schematic example of the invention.
    In the following description, like reference numerals will be used to identify corresponding components in accordance with the various views illustrating the invention.
    In the example of Fig. 1, a fibrous web W is guided on a surface of a rotary drum 10 which supports the fibrous web W during application of a treating substance C. The direction of rotation of the roller 10 is indicated by an arrow S. A treating substance nozzle 15 for applying the treating substance C in the form of a foam is provided for applying the treating substance C. From the nozzle 15, the treating substance C is led to a guide surface 20 which is disposed in contact with the surface of the fibrous web W. The guide surface 20 is inclined downwardly with respect to the rotational direction S of the roller 10.
    In the example of Fig. 2, a fibrous web W is passed on a surface of a rotary drum 10 which supports the fibrous web W during application of a treating substance C. The direction of rotation of the roller 10 is indicated by an arrow S. A treating substance nozzle 15 for applying the treating substance C in the form of a foam is disposed above a guide surface such that the treating substance C is guided from the nozzle 15 onto the guide surface 20 having a bendable end for dragging contact with the surface of the nozzle Fiber web W has. The guide surface 20 is inclined downwardly with respect to the rotational direction S of the roller 10.
    The treating substance C may also be applied indirectly (FIG. 5) to the fibrous web W by first applying the treating substance C to the surface of the roller 10 before the fibrous web W is brought into contact with the surface of the roller 10 Using similar principles of the job as in the direct application to the fiber web W, as explained in Fig. 1 and Fig. 2.
    In the example of FIG. 3, the fibrous web W is guided on a surface of the rotary drum 10 which supports the fibrous web W during application of the treating substance C. The fiber web W can also be guided by the other roller 11. The direction of rotation of the roller 10 is indicated by the arrow S. The roll 10 forms a nip with its counter roll 11, and a nip P of the treating substance is formed on the nip when the die 15 applies the treating substance C in the form of the foam to the sump P. From the nozzle 15, the treatment substance is directed to the guide surface 20, which is arranged in contact with the surface of the sump P. The guide surface 20 is inclined downwardly with respect to the rotational direction S of the roller 10. In the nip between the rollers 10, 11, the treatment substance is pressed into the fiber web W. The nip can also be easily opened, so that no pressing occurs.
    The sump application may also be two-sided, with the fibrous web W being directed to the nip in the middle without the web on one side of the nip
    Winding rollers 10 or 11 and wherein the sump is formed on both sides of the fibrous web W.
    In the example of Fig. 4, the fibrous web W is guided on a surface of the rotary drum 10 which supports the fibrous web W during application of the treating substance. The direction of rotation of the roller 10 is indicated by the arrow S. The treating substance nozzle 15 for applying the treating substance C in the form of the foam is provided for applying the treating substance C. From the nozzle 15, the treating substance C is supplied to the guide surface 20 which is disposed in contact with the surface of the fibrous web W. The guide surface 20 is inclined downwardly with respect to the rotational direction S of the roller 10. After the guide surface 20, a scraper blade 28 is arranged for smoothing the layer of the substance C.
    In the example of FIG. 5, the treating substance C is indirectly applied to the fibrous web W by first applying the treating substance C to the surface of the roller 10 before the fibrous web W is brought into contact with the surface of the roller 10. In the example of Fig. 5, the fibrous web W is guided on the surface of a rotary drum 10 supporting the fibrous web W during application of the treating substance, and an optional back-up roller 29 can be used to apply the fibrous web W to the surface of the drum 10 to press. The direction of rotation of the roller 10 is indicated by an arrow S. A treating substance nozzle 15 for applying the treating substance C in the form of a foam is disposed in contact with the surface of the roller 10. From the nozzle 15, the treatment substance C is led to a guide surface 20 which is arranged to contact the surface of the roller 10. The guide surface 20 is inclined, so that the treatment substance C flows downward toward the surface of the roller 10. The treating substance C is applied to the baffle 20 in such a manner that the flow of the treating substance C between the baffle 20 and the surface of the roller 10 remains.
    As can be seen from the examples of Figs. 1-5, the treating substance C can be applied directly or indirectly to the fibrous web W, for example according to the surface of the roll 10 or the fabric or the tape in an indirect application or on a corresponding surface of the web Fiber web W or the swell P in the direct application, and the substance is flowed over a guide surface on the surface and the edge tip or the end portion of the guide surface 20 is disposed in contact with the surface to which the substance is applied. The treatment substance C to be applied by the nozzle 15 of the application unit is a coating color or a sizing agent. The nozzle 15 is a substantially full-width slot nozzle of a curtain or jet-type nozzle, or is formed as a distribution channel structure having a plurality of spaced-apart openings over substantially the entire width of the fiber web W, wherein the openings, the treatment substance is passed onto the guide surface 20, which is inclined. The stream of treating substance C is directed by the baffle 20 via which it is applied to the surface of the fibrous web W in a direct application or to the surface of the roll or fabric or belt over which the substance is applied to the surface of the fibrous web W at the indirect order, or conducted to a sump formed between two surfaces to
    Example two rolls forming a nip, whereby the fiber web runs through the nip.
    LIST OF REFERENCES 10 roller 11 roller 15 nozzle 20 guide surface 28 doctor blade 29 support roller C treatment substance P sump S rotation direction W fiber web
    权利要求:
    Claims (13)
    [1]
    claims
    Method for applying at least one layer of a substance (C) in the form of foam to a moving fiber web (W) through at least one opening of at least one nozzle (15) of an application unit, characterized in that the substance (C) differs from the one Nozzle opening (15) is allowed to flow onto a baffle (20), from which baffle (20) the substance (C) is allowed to flow onto a target surface, and one end of the baffle (20) is in contact with the target surface on which the substance is applied, is arranged.
    [2]
    2. The method according to claim 1, characterized in that the substance (C) on the guide surface (20) is in ambient pressure.
    [3]
    3. The method according to claim 1 or 2, characterized in that the substance C) from the guide surface (20) directly or indirectly on the fiber web (W) is applied.
    [4]
    4. The method according to any one of claims 1-3, characterized in that the substance to be applied (C) is a coating color or a sizing agent or a moistening agent or another, the properties of the fibrous web influencing agent.
    [5]
    5. The method according to any one of claims 1-4, characterized in that the flow of the substance from the guide surface (20) on the surface of the fibrous web (W) in direct order or on a surface of a roller (10) or a fabric or a Bands, by means of which the substance is passed on the surface of the fiber web (W) in the indirect order, or to a sump (P) which is passed between a pair of rollers (10,11) or a pair of a roller and a fabric , or a pair of a roller and a band, or a pair of a fabric and a band, or a pair of two bands or a pair of two tissues forming a nip through which the fibrous web passes.
    [6]
    6. The method according to any one of claims 1-5, characterized in that at least one layer of the substance (C) in the form of the foam on one side or two sides on the fiber web (W) is applied.
    [7]
    7. System for applying a layer of a substance (C) in the form of foam directly or indirectly to a moving fiber web (W) with at least one opening of at least one nozzle (15) of an application unit, characterized in that below the nozzle (15 ) is arranged a guide surface (20), wherein one end of the guide surface (20) in contact with a target surface on which the substance is applied, is arranged.
    [8]
    8. System according to claim 7, characterized in that the target surface in a direct application system is the surface of the fiber web (W) or in an indirect application system, the surface of a roller (10) or the surface of a fabric or the surface of a belt or a surface of a swamp (P).
    [9]
    9. System according to claim 7 or 8, characterized in that the nozzle (15) is a substantially over the entire width extending slot nozzle or a curtain or jet-like nozzle.
    [10]
    The system of claim 7 or 8, characterized in that the nozzle (15) is formed as a Verteilkanalstruktur having a plurality of spaced apart openings on substantially the entire width of the fiber web, wherein from the openings the treatment substance on the guide surface ( 20) is passed.
    [11]
    A system according to any one of claims 7-10, characterized in that the guide surface (20) is arranged such that the flow of the substance (C) is downwardly inclined with respect to the surface to which it is applied ,
    [12]
    12. System according to any one of claims 7 - 11, characterized in that the system also has a scraper blade (28) which is arranged in the direction of movement of the target surface of the guide surface (20).
    [13]
    13. System according to any one of claims 7 - 12, characterized in that the system is arranged in a wire section or a press section or a dryer section or a glue section or a coating section or a calendering section of a fiber web production line.
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    同族专利:
    公开号 | 公开日
    FI20165927L|2018-06-08|
    AT519414A3|2018-08-15|
    DE102017128240A1|2018-06-07|
    FI127812B|2019-03-15|
    AT519414B1|2019-01-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US11255051B2|2017-11-29|2022-02-22|Kimberly-Clark Worldwide, Inc.|Fibrous sheet with improved properties|US4488932A|1982-08-18|1984-12-18|James River-Dixie/Northern, Inc.|Fibrous webs of enhanced bulk and method of manufacturing same|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI20165927A|FI127812B|2016-12-07|2016-12-07|Method and system for applying a substance layer onto a moving fiber web by foam application|
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