EP3607141A1 - Verfahren und vorrichtung zur aufbringung eines stoffs auf eine sich bewegende bahn - Google Patents
Verfahren und vorrichtung zur aufbringung eines stoffs auf eine sich bewegende bahnInfo
- Publication number
- EP3607141A1 EP3607141A1 EP18708956.0A EP18708956A EP3607141A1 EP 3607141 A1 EP3607141 A1 EP 3607141A1 EP 18708956 A EP18708956 A EP 18708956A EP 3607141 A1 EP3607141 A1 EP 3607141A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- line
- vapor mixture
- mixture
- steam
- 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- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/50—Spraying or projecting
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
- D21H23/20—Apparatus therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/24—Addition to the formed paper during paper manufacture
- D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/42—Paper being at least partly surrounded by the material on both sides
- D21H23/44—Treatment with a gas or vapour
Definitions
- the invention relates to a method for applying a substance to a moving web of a product, wherein an air-vapor mixture is supplied to at least one nozzle, with which the substance by means of the air-vapor mixture as blowing agent in an application zone on the Web is applied, wherein excess air-vapor mixture and excess material are discharged from the application zone.
- the invention relates to a device for applying a substance to a moving web of a product, wherein an air-vapor mixture is supplied via a first conduit at least one nozzle, which is arranged in an enclosure which limits an application zone, said Substance can be applied by means of the air-vapor mixture as a blowing agent on the web and excess air-vapor mixture and excess substance from the application zone can be discharged through a second line.
- the method and the associated device described in the introduction are used in particular in the production of endless webs of fibrous materials, in particular paper or similar nonwovens.
- the substance with which the web of the material is sprayed, in particular coated can be, for example, a paint, starch, a binder, an adhesive, an impregnating agent or the like.
- the application of the coating material is typically carried out with a plurality of nozzles which are arranged transversely to the running direction of the web of the material to be coated.
- the air-vapor mixture which is introduced as a propellant through the nozzles in the interior of the housing in the application zone, is sucked in the prior art by means of exhaust fans from this enclosure again.
- the heat energy contained in this exhaust air stream is at least partially withdrawn and as
- the invention has for its object to provide a method and an apparatus for
- the underlying object is achieved in that at least a portion of the discharged from the application zone, excess air-steam mixture is recycled and the at least one nozzle is fed back.
- the method according to the invention thus not only the heat is removed from the air-steam mixture, but there is a real material recycling instead, in the sense that the same air-vapor mixture is circulated and thus back to the at least one Nozzle passes.
- the air-steam mixture is usually as much heat withdrawn as possible, although well below the dew point and may accumulate condensate. Nevertheless, the system continuously loses energy and water with the volume flow delivered.
- the enthalpy of enthalpy of the water contained in the recycled part of the mixture is obtained at least in the part of the air-steam mixture which is recycled. According to the invention, this energy is thus no longer lost according to the invention, so that significantly less energy has to be used overall than in the prior art.
- the air-steam mixture is dehumidified in the course of recycling, preferably by means of a
- a cyclone is preferably arranged immediately after the discharge of the air-vapor mixture from the application zone in order to achieve a separation of condensate and to prevent carryover of water into the further line system and beyond the at least one conveyor, in the circulation arranged to promote the air-vapor mixture, to protect against excessive water pollution. Is located
- Mist separator in the stream of recycled air-steam mixture so the latter subsequently also fed to a conveyor which reacts very sensitively with respect to water in liquid form, for example a rotary compressor.
- the invention further ausgestaltend it is proposed that a portion of the excess air-vapor mixture, preferably after its dehumidification, preferably by means of a cyclone, discharged from the circulation and preferably discharged to the environment.
- the volumetric flow rate of the recycled air-steam mixture is reduced compared with the volumetric flow supplied to the at least one nozzle in the application zone, so that it is possible to reduce the amount of steam added to be recycled to increase the moisture content of the air-vapor mixture to be supplied to the at least one nozzle back to the desired value), without thereby increasing the total mass flow beyond the required level.
- a development of the invention provides that after the removal of a portion of the excess air-steam mixture from the circulation air preferably
- the recycled stream of air-vapor mixture is supplied.
- the total volume flow required for the subsequent supply to the at least one nozzle is achieved and, on the other hand, the low humidity of the supplied (outside) air makes it possible to realize the temperature increase by adding steam in a later method step, without the required To exceed water content.
- the recycled stream of the air-vapor mixture can be returned to the at least one nozzle, it is necessary to raise the temperature to between about 80 ° C and about 110 ° C, including the recycled or air mixed with low humidity recycled stream of steam at a temperature between 105 ° C and 180 ° C and a pressure between 1, 2 bar (abs.) and 10 bar (abs.) Is added.
- steam cooling by means of condensate injection is necessary in order to keep the temperature and humidity within the required limits.
- the underlying object is achieved by a third line, through which a part of the discharged from the second line excess air-vapor mixture in the first conduit is feasible.
- the formerly open system with material completely separate feed side and discharge side of the air vapor mixture is closed in this way, at least for a partial volume flow of the excess air-steam mixture.
- the third line thus forms a connection between the feed side and the discharge side of the housing or application zone.
- the device according to the invention comprises a sixth conduit, through which steam from a vapor source into the recycled air-steam mixture can be guided, wherein more preferably, the sixth conduit is disposed downstream of the junction of the third conduit in the first conduit.
- the device further ausgestaltend is provided that the excess air-steam mixture by means of a process air fan, preferably by means of a
- Rotary compressor can reach the pressure required on the feed side of the at least one nozzle efficiently.
- a mist eliminator and further preferably before the rotary compressor is arranged a filter.
- the sensitive to liquid water rotary compressor is protected safely in this way.
- the energy efficiency of the device according to the invention is increased when heat of the discharged to the environment non-recycled part of the excess air-vapor mixture, which is guided in the fifth line, on air through a fourth line and the first line in the direction of at least one nozzle is guided, is transmitted.
- the method according to the invention will be explained in more detail below with reference to an exemplary embodiment of a device for its implementation, which is illustrated in the drawing figure.
- the drawing figure shows a schematic process diagram which explains the procedure according to the invention.
- a device 1 for applying a substance, namely a starch suspension, to a moving web 4 of a product, namely a paper web, has an enclosure 2 which, together with a web 4 moving in the direction of an arrow 3, forms a web
- the enclosure 2 has a cuboid shape and extends over the entire width of the web 4 of the paper extending perpendicular to the plane of the drawing.
- Two longitudinal sides 8 and a narrow side 9 of the enclosure 2 together form a U, which is closed at an open side by the passing web 4 of the paper, so that a rectangle is formed in cross section.
- the front sides of the housing 2, which are not visible in the drawing figure, are also closed, so that the interior 5 of the housing 2, apart from gap areas 10 between the two
- the cuboid application device 7 which extends transversely to the direction of the web 4 of the paper over the entire width of the web.
- the application device 7 comprises a cuboidal housing 11, on whose web 4, facing the web 4, a plurality of nozzles 13 arranged in series one behind the other is arranged.
- the nozzles 13 are two-substance nozzles, each of which is supplied via a first line 14, an air-steam mixture and a further line 15, a starch suspension. Serving as propellant air-vapor mixture is homogeneous in the nozzles 13 with the
- the air-vapor mixture also contains a proportion of excess starch suspension and that of less than 1%.
- the excess air-vapor mixture then passes into a cyclone 18, are deposited in the water droplets.
- the air-steam mixture flows after the cyclone 18 through a process air fan 19, with which the required negative pressure for suction from the housing 2 is generated.
- the air-vapor mixture from the process air fan 19 exits this has a relative humidity of 80% to 100% and a temperature between 70 ° C and 100 ° C.
- a partial volume flow of the air-steam mixture is then discharged via a fifth line 21. The proportion of this volume flow at the
- Total volume flow in the second line 17 is about 15 to 20%.
- the other part of the air-steam mixture is circulated via a third line 22.
- the not circulated, flowing through the fifth line 21 part of the air-vapor mixture passes before being discharged to the environment a heat exchanger 23, which is also integrated in a fourth line 24 and by means of which the fifth line 21 flowing exhaust air withdrawn their heat and on fresh air, preferably outside air flowing in the fourth line 24, is transmitted.
- the current flowing through the fourth line 24 and the current flowing through the third line 22 combine with each other.
- the relative humidity of the partially recycled and partially "rejuvenated" air-vapor mixture is about 85% to 100% and the temperature is about 70 ° C. to 80 ° C.
- This mixing volume flow is now in a first Line 26, which is up to the housing located in the enclosure 2
- Application device 7 extends. Following the passage of a mist eliminator 27 and a filter 28, the above-described mixing volume flow passes into a rotary compressor 29. The relative humidity falls after the rotary compressor 29, since the temperature rises very sharply due to the heat of compression. At another
- Junction 30 meet the third line 26 and a sixth line 31 to each other, which is supplied by the latter pure steam at a temperature of 105%, ie a pressure of 1, 2 bar (abs), from a steam generator or steam tank.
- a temperature of 105% ie a pressure of 1, 2 bar (abs)
- a steam generator or steam tank By means of live steam and optionally condensate injection into a mixing chamber 35, the temperature of the created behind the junction 30 mixing volume flow in the third conduit 26 is increased to about 95%.
- the partially recycled "fresh" air-vapor mixture mixed with preheated outdoor air and finally live steam enters the collection tube 16 of the applicator and then mixes in the nozzles 13 with starch and is sprayed onto the web 4 of the paper.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017107213.6A DE102017107213A1 (de) | 2017-04-04 | 2017-04-04 | Verfahren und Vorrichtung zur Aufbringung eines Stoffs auf eine sich bewegende Bahn |
PCT/EP2018/054862 WO2018184765A1 (de) | 2017-04-04 | 2018-02-28 | Verfahren und vorrichtung zur aufbringung eines stoffs auf eine sich bewegende bahn |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3607141A1 true EP3607141A1 (de) | 2020-02-12 |
Family
ID=61569243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18708956.0A Withdrawn EP3607141A1 (de) | 2017-04-04 | 2018-02-28 | Verfahren und vorrichtung zur aufbringung eines stoffs auf eine sich bewegende bahn |
Country Status (4)
Country | Link |
---|---|
US (1) | US20200208352A1 (de) |
EP (1) | EP3607141A1 (de) |
DE (1) | DE102017107213A1 (de) |
WO (1) | WO2018184765A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111250318A (zh) * | 2020-04-02 | 2020-06-09 | 绍兴市上虞嘉盛涂装有限公司 | 一种喷涂用油漆回收利用装置及其工作方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI115314B (fi) * | 2001-03-13 | 2005-04-15 | Metso Paper Inc | Sovitelma paperin tai kartongin käsittelemiseksi |
US7217342B2 (en) * | 2002-11-25 | 2007-05-15 | Kangas Martti Y O | Apparatus for paper making and paper surface enhancement |
FI124251B (fi) * | 2007-05-14 | 2014-05-15 | Valmet Technologies Inc | Menetelmä ja sovitelma kuituradan käsittelemiseksi |
DE102009009862B4 (de) * | 2009-02-20 | 2013-10-10 | Paperchine Gmbh | Verfahren und Anlage zum Aufbringen einer Suspension auf eine Materialbahn |
FI123582B (fi) * | 2010-04-29 | 2013-07-31 | Metso Paper Inc | Menetelmä ja laitteisto kuiturainan käsittelemiseksi |
DE102011002671A1 (de) * | 2011-01-13 | 2012-07-19 | Metso Paper, Inc. | Leimmittelzuführsystem zum Zuführen von Leimmittel zu einer Papier- oder Kartonbahn |
-
2017
- 2017-04-04 DE DE102017107213.6A patent/DE102017107213A1/de not_active Withdrawn
-
2018
- 2018-02-28 US US16/500,531 patent/US20200208352A1/en not_active Abandoned
- 2018-02-28 WO PCT/EP2018/054862 patent/WO2018184765A1/de active Search and Examination
- 2018-02-28 EP EP18708956.0A patent/EP3607141A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2018184765A1 (de) | 2018-10-11 |
DE102017107213A1 (de) | 2018-10-04 |
US20200208352A1 (en) | 2020-07-02 |
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