• 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 layer of a substance (C) in the form of a foam to a moving fiber web (W) by means of foam application through at least one opening of at least one nozzle (15) of an application unit. The substance (C) is allowed to flow from the opening of the nozzle (15) onto a guide surface (20), and the substance (C) is allowed to flow on the guide surface (20) in an ambient pressure and the outermost edge, i. H. the nearest point of the guide surface (20) is spaced apart from a target surface, wherein the target surface is the surface of the fiber web or a surface of a roll (10) or a surface of a fabric or a surface of a belt or a surface of a sump (P ).
    公开号:AT519423A2
    申请号:T50995/2017
    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 layer of a substance to a moving fibrous web by means of foam dressing
    The invention relates to a method and a system for applying a layer of a substance 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 Bahnabrisssituationen during the Flerstellungsprozes-ses.
    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 of 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. the nearest point of the baffle is spaced apart from a target surface, where 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. 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 baffle to the web or transfer surface, the foam has already equilibrated with the ambient pressure and only little or no expansion takes place so that a lesser flow of the foamed substance in the opposite direction and the amount applied is less sensitive to the pitch of the application and the speed of movement of the fibrous web and is generally the required one
    Balance parameters can be achieved more easily. There is also no need to remove the foamed substance in the opposite direction with respect to the direction of movement of the fibrous web, since the foamed substance does not flow in the opposite direction.
    According to the invention, the foamed substance is allowed to flow from the baffle directly onto the moving fibrous web or over a rotating roll surface or over a moving belt or web or over a sump onto the moving fibrous web.
    According to an advantageous embodiment of the invention, the distance of the nozzle opening of the application unit 15 mm or more of the target surface on which the substance is applied, for example, the target surface of the roller or the fabric or the tape in the indirect application or the target surface of the fibrous web the direct application or target area of a swamp. When the distance between the nozzle opening and the target surface is 15 mm or more, the foamed substance has time to equalize and equilibrate to form a continuous, smooth substance layer as it flows on the guide surface.
    According to an advantageous embodiment of the invention, the nozzle opening is arranged above the target surface, wherein the target surface depending on the order arrangement, the surface of the fiber web in the direct application or the surface of the roller or the surface of the fabric or the surface of the belt or the surface of the sump the indirect application is.
    According to an advantageous development of the invention, the foamed substance to be applied by means of the application unit is a coating color or a sizing agent or a wetting agent or another type of agent which influences the properties of the fiber web. The method and system according to the invention may, for example, in connection with the application of a coating color layer on a fibrous web for printed products or in connection with glues on an upper side of a fibrous web and in connection with the production of a film, membrane or lacquer layer for Example be provided when converting products.
    According to an advantageous development of the invention, the nozzle is a slit nozzle substantially extending over the entire width or a curtain or a jet-like nozzle or jet nozzle from the nozzle opening or openings, from which the foamed substance is allowed to flow onto the guide surface.
    According to an advantageous embodiment of the invention, the nozzle is formed as a Verteilkanalstruktur having a plurality of spaced apart openings in the transverse direction of the fiber web over substantially the entire width of the fiber web, wherein the treatment substance is passed from the openings on the guide surface.
    According to an advantageous embodiment of the invention, the guide surface is arranged so that the flow of the applied substance is perpendicular or in a downward slope with respect to the surface to which it is applied.
    According to an advantageous embodiment of the invention, the stream of the application substance is guided by a guide surface, via which it is applied to the surface of the fiber web in the direct application or on the surface of the roller or the fabric or the belt over which the substance on the surface of the Fiber web is passed in the indirect application, or on a sump, which is between a pair of rollers or a pair of a roller and a fabric or a pair of a roller and a belt, or a pair of a fabric and a belt or from a A pair of two bands or of a pair of two tissues is formed, which form a nip, which passes through the nip, the fiber web.
    According to an advantageous development of the invention, the system also has a device for removing a limiting air flow, wherein the device is arranged in a direction of movement of the fiber web, i. H. in front of the region in which the foamed substance reaches the surface of the fibrous web or the roll or the fabric or ribbon in the direction of movement of the fibrous web from the conducting surface. The device for removing the limiting air flow may comprise a non-contact device, such as a suction device or a blowing device or a mechanical, contacting device, such as a doctor blade.
    According to an advantageous development, the system is arranged in a wire section or a press section or a drying section or a sizing section or a coating section or a calendering section of a fiber web production line. For example, the system may be used for sizing the fibrous web in the wire section or the press section, or for applying a size or size coat.
    Stratifying agent can be used in the dry end of a fiber web production line.
    According to an advantageous embodiment of the invention, the system has two rollers forming 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 an advantageous development of the invention, at least one layer of the substance in the form of the foam is applied to the fibrous web on one side or two sides.
    According to an advantageous development of the invention, a support surface on the other side of the fibrous web is used in the one-sided application. The support surface may preferably be a rotating roller or a rotating cylinder. The support surface may also be a fabric or a band or a movable support surface or a non-movable surface or other stationary element.
    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 can be controlled precisely and simply.
    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 the 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 at a distance from the surface of the fibrous web W, and the distance between the opening of the nozzle 15 and the surface of the fibrous web W is at least 15 mm. From the nozzle 15, the treatment substance C is directed to a guide surface 20 which is arranged so that it does not touch the fiber web, i. H. with a distance from the fiber web W. The distance between the nearest or nearest point of the guide surface 20 and the fiber web W is 1 - 200 mm. The guide surface 20 is inclined downwardly relative to the rotational direction S of the roller 10, and the treatment substance C is applied to the back surface of the guide surface 20 from the roller side. Before the treatment substance C is applied from the guide surface 20, a scraper 25 for removing a boundary air layer is arranged in the direction of movement of the fiber web W. The scraper may be formed as a scraper blade or air scraper or other type of boundary air removal device.
    In the example of FIG. 2, a fibrous web W is guided on a surface of a rotary drum 10 which supports the fibrous web W during the 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 at a distance from the surface of the fibrous web W, and the distance between the opening of the nozzle 15 and the surface of the fibrous web W is at least 15 mm. From the nozzle 15, the treatment substance C is directed to a guide surface 20 which is arranged so that it does not touch the fiber web, i. H. at a distance from the fiber web W. The distance between the nearest point of the guide surface 20 and the fiber web W is 0.1-200 mm. The guide surface 20 is inclined, so that the treatment substance C flows downward in the direction of the fibrous web W. The treating substance C is applied to the guide plate 20 in such a manner that the flow of the treating substance remains between the guide plate 20 and the fibrous web W. In particular, the lowermost point of the baffle 20 may be located close to the surface of the fibrous web W so that the distance between the nearest point of the baffle 20 and the web W is relatively small and this clearance serves as a gap for sizing the flow. In front of the place where the treating substance C is applied from the guide surface 20 to the fibrous web W, a contactless limiting air removing means 25 is arranged in the upstream direction from the application site.
    It should be pointed out that the treating substance C can be indirectly applied (Fig. 5) to the web W by first applying the treating substance C to the roll surface 10 before the fibrous web W is in contact with the surface of the roll 10, using similar application principles as in direct application to the fibrous web W as described in FIGS. 1 and 2.
    In the example of FIG. 3, a fibrous web W is guided on a surface of a rotary drum 10 which supports the fibrous web W during the application of a treating substance C. The fiber web W can also be passed through the other roller 11. The direction of rotation of the roller 10 and the roller 11 is indicated by an arrow S. The roll 10 forms a nip with its counter roll 11, and on the nip, a pond P of the treating substance C is formed when the die 15 applies the treating substance C in the form of a foam. The nozzle opening of the nozzle 15 is arranged at a distance from the O-surface of the sump P and the distance is at least 15 mm. From the opening of the nozzle 15, the treatment substance C is led to a guide surface 20 which is arranged at a distance of 2 to 500 mm from the surface of the sump P. The guide surface 20 is inclined in such a manner that the treatment substance C flows downward in the direction of the sump P. In the nip between the rolls 10, 11, the treating substance C is pressed into the fiber web W. The nip can also be easily opened, so that no pressing occurs. The guide surface 20 may also include a groove or the like for forming a pre-sump before the foamed substance is passed into the sump P.
    The sump application may also be two-sided, wherein the fibrous web W is directed to the nip between the rollers 10, 11 in the middle, without the fibrous web W being wound on either of the rollers 10 or 11, and the sump on both sides of the fibrous web W is formed.
    In the example of FIG. 4, a fibrous web W which is supported by a negative pressure device 27 and possibly additionally by a moving tissue 28 is guided in the direction of movement R. A treating substance nozzle 15 for applying the treating substance C in the form of the foam is disposed at a distance from the corresponding surface of the fibrous web W, and the distance between the nozzle opening and the fibrous web W is at least 15 mm. From the nozzle 10, the treatment substance is guided onto a guide surface 20, which is arranged at a distance from the surface of the fiber web W. The distance between the next point of the guide surface 20 and the fiber web W is 2-200 mm. The guide surface 20 is inclined downwardly relative to the direction of movement of the fibrous web W. Before the treatment substance C is applied from the guide surface 20, an air-removing device 25 for removing a boundary air layer is arranged in the moving direction of the fiber web W.
    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 at a distance from the surface of the roller 10, and the distance between the opening of the nozzle and the fiber web W is at least 15 mm. From the nozzle 15, the treatment substance is directed to a guide surface 20 which is arranged so that it does not touch the surface of the roller 10, d. H. with a distance from the surface of the roller 10. The distance between the nearest point of the guide surface 20 and the surface of the roller 10 is 0.1 - 200 mm.
    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 remains between the baffle 20 and the surface of the roller 10. In front of the location at which the treatment substance C is applied from the guide surface 20 to the surface of the roller 10, a contactless boundary air removal device 25 is arranged in the upstream direction from the application site.
    As can be seen from the examples of FIGS. 1-5, the distance of the nozzle opening, with the nozzle opening being arranged at the tip of the applicator nozzle 15, the treatment substance C being applied directly or indirectly to the fiber web W, is greater than 15 mm the target surface to which the substance is applied, for example, the surface of the roller 10 or the fabric or tape in an indirect application or the surface of the fiber web W in a direct application or the surface of the sump P and the substance is transferred over the guide surface 20 flowed onto the target surface and the edge tip of the guide surface 20, d. H. the nearest point of the guide surface 20 is located at a distance from the target surface to which the substance is to be applied. The treatment substance C to be applied through the nozzle 15 of the application unit is preferably coating color or sizing agent. The nozzle 15 may be a substantially full-width slot nozzle or a curtain or jet-type nozzle, or it may be formed as a distribution channel structure having a plurality of spaced-apart openings over substantially the entire width of the fiber web W, of which Openings the treatment substance is directed to the guide surface 20, which is inclined. The stream of treating substance C is passed through the inclined baffle 20, over which it is directed onto the surface of the fibrous web W in a direct application, or onto the surface of the roller or web or belt over which the substance is applied to the surface of the web Fiber web is passed in an indirect application or to a sump, which is formed between two surfaces, for example, two nip forming rollers, wherein the fiber web passes through the nip. The system may also include a device 28 for removing a boundary air layer, the device being arranged in front of the application area in the direction of movement of the fiber web W. The limiting air flow removing means 25 may include a non-contact device such as a suction device or a blowing device that can be used in the direct application of the treating substance C to the fiber web W or a contacting device such as a doctor blade can be, when the application of the treating substance C is performed indirectly on a transfer surface (for example, the roller 10) on the surface of the fibrous web W.
    LIST OF REFERENCE NUMERALS 10 Roller 11 Roller 15 Nozzle 20 Conduction surface 25 Device for removing the limiting air flow 27 Vacuum device 28 Fabric 29 Support roller C Treatment substance P Swamp R Direction of movement S Rotation direction W Fiber web
    权利要求:
    Claims (15)
    [1]
    claims
    1. A method for applying at least one layer of a substance (C) in the form of a foam to a moving fiber web (W) by foam application through at least one opening of at least one nozzle (15) of an application unit, characterized in that the substance (C) from the opening of the nozzle (15) onto a baffle (20), allowing the substance (C) to flow on the baffle (20) in an ambient pressure, and that the outermost edge, i. H. the nearest point of the baffle (20) is spaced apart from a target surface, the target surface being the surface of the fibrous web or a surface of a roll (10) or a surface of a fabric or a surface of a belt or surface of a sump (P ).
    [2]
    2. The method according to claim 1, characterized in that the opening or the openings of the nozzle (15) is arranged at a distance of 15 mm or more from the target surface or are.
    [3]
    3. The method according to claim 1 or 2, characterized in that the opening or the openings is arranged above the target surface or are.
    [4]
    4. The method according to any one of the preceding claims, characterized in that the applied by means of the application unit substance (C) is a coating color or a sizing agent or a humectant or other type of agent which affects the properties of the fiber web is.
    [5]
    A method according to any one of the preceding claims, characterized in that the flow of the substance through the baffle (20) to the surface of the fibrous web (W) in a direct application or to the surface of the roll (10) or to the surface of the fabric or applied to the surface of the web over which the substance (C) is passed to the surface of the fibrous web (W) in an indirect application, or to a sump (P) which is interposed between a pair of rolls (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 is formed, which form a nip, wherein through the nip the fiber web (W) runs.
    [6]
    6. The method according to any one of the preceding claims, characterized in that at least one layer of the substance (C) in the form of the foam on one side or two sides is applied to the fibrous web.
    [7]
    A system for applying a layer of a substance (C) to a moving fibrous web (W) by means of foam application, which has at least one opening of at least one nozzle (15) of an application unit, characterized in that the system comprises a guide surface (20) for Having the substance on a target surface, and that the nearest point of the guide surface (20) and the target surface are arranged at a distance from each other.
    [8]
    A system as claimed in claim 7, characterized in that the opening (s) of the nozzle (15) is / are located at a distance of 15mm or more from the target surface.
    [9]
    A system according to claim 7 or 8, characterized in that the target surface is the area of the fibrous web in a direct application system or a surface of a roll or a surface of a fabric or a surface of a belt in an indirect application system or a surface of a sump which is 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 Is formed tissues that form a nip, whereby the fiber web is passed through the nip.
    [10]
    10. System according to any one of claims 7-9, characterized in that the nozzle (15) is a substantially over the entire width extending slot nozzle or a curtain or a jet-like nozzle or jet nozzle.
    [11]
    A system according to any one of claims 7-10, characterized in that the nozzle (15) is formed as a distribution channel structure having a plurality of mutually spaced openings over substantially the entire width of the fibrous web, the treatment substance (C) of the Openings is directed to the guide surface.
    [12]
    A system according to any one of claims 7-11, characterized in that the guide surface is arranged so that the flow of the applied substance is perpendicular or in a downward slope with respect to the surface to which it is applied.
    [13]
    13. System according to any one of claims 7-12, characterized in that the system also comprises means (25) for removing a boundary air flow, wherein the device (25) in a direction of movement of the fiber web (W) is arranged in front of the application area, and in that the device (25) for removing the limiting air flow comprises a suction device, a blowing device or a contacting mechanical limiting air flow removal device or a combination of at least two of them.
    [14]
    14. System according to any one of claims 7-13, characterized in that the opening or the openings is arranged above the target surface or are.
    [15]
    A system according to any one of claims 7-14, characterized in that the system is arranged in at least one of: a wire section or a press section or a dryer section or a sizing 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
    AT519423A3|2018-08-15|
    DE102017128242A1|2018-06-07|
    AT519423B1|2018-11-15|
    FI20165926L|2018-06-08|
    FI127813B|2019-03-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4488932A|1982-08-18|1984-12-18|James River-Dixie/Northern, Inc.|Fibrous webs of enhanced bulk and method of manufacturing same|GB2582508B|2017-11-29|2022-02-16|Kimberly Clark Co|Fibrous sheet with improved properties|
    EP3910103A1|2020-05-15|2021-11-17|Valmet Technologies Oy|Method and system for applying a substance layer onto a moving fiber web by foam application|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI20165926A|FI127813B|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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