FI130270B - Supply system of a treatment system of application of a treatment substance of a fiber web - Google Patents

Supply system of a treatment system of application of a treatment substance of a fiber web Download PDF

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Publication number
FI130270B
FI130270B FI20225223A FI20225223A FI130270B FI 130270 B FI130270 B FI 130270B FI 20225223 A FI20225223 A FI 20225223A FI 20225223 A FI20225223 A FI 20225223A FI 130270 B FI130270 B FI 130270B
Authority
FI
Finland
Prior art keywords
supply system
treatment
treatment substance
substance
temperature
Prior art date
Application number
FI20225223A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20225223A1 (en
Inventor
Tapio Pitkäniemi
Antti Räisänen
Henri Vaittinen
Heikki Vatanen
Janne Heinilä
Jan Niemi
Jukka Sarvela
Mikko Tiiliharju
Original Assignee
Valmet Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to FI20225223A priority Critical patent/FI130270B/en
Priority to ATA50164/2023A priority patent/AT525941B1/en
Priority to DE102023105446.5A priority patent/DE102023105446A1/en
Application granted granted Critical
Publication of FI20225223A1 publication Critical patent/FI20225223A1/en
Publication of FI130270B publication Critical patent/FI130270B/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/49—Mixing systems, i.e. flow charts or diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/213—Measuring of the properties of the mixtures, e.g. temperature, density or colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/2136—Viscosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2209—Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1007—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/04—Head boxes of cylinder machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/08—Regulating consistency
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The invention relates to a supply system of a treatment system for application of a treatment substance of a fiber web, which treatment system (10) comprises the supply system (20) and an application system (30), which application system (30) comprises at least one curtain application device (31), which application system (30) is connected to the supply system (20) for receiving the treatment substance from the supply system (20) for applying the treatment substance to a fiber web directly or indirectly as a curtain created by the curtain application device (31), which supply system comprises a treatment system feed (TS) configured to feed a treatment substance to the supply system (20), a water feed (WL) configured to feed water to the treatment substance flow in the supply system (20), a machine tank (22), a screening device (25) configured to screen the treatment substance. The supply system (20) comprises a comprehensive temperature control system comprising the water feed (WL) and the steam feed (S) for controlling the temperature of the treatment substance in the supply system to provide the treatment substance to the application device at a desired temperature range, and the supply system (20) comprises at least one measurement device (TM; VIM) configured to provide measurement information to the temperature control system for controlling the temperature of the treatment substance.

Description

Supply system of a treatment system of application of a treatment substance of a fiber web
Technical field
In general, the present invention relates to treating of fiber webs in a fiber web production line, in particular, the present invention relates to supply system of a treatment system for application of a treatment substance of a fiber web, which treatment substance is to be applied by a curtain application device. More especially the present invention relates to a supply system of a treatment system according to preamble part of the independent supply system claim.
Background
Fiber webs, such as paper and board webs are available in a wide variety of types and can be divided according to basis weight in two grades: papers with a single ply and a basis weight of 25-300 g/m? and boards manufactured in multi-ply technology and having a basis weight of 150-600 g/m?. It should be noted that the borderline between paper and board is flexible since board grades with lightest basis weights are lighter than the heaviest paper grades. Generally speaking, paper is used for printing and board for packaging.
The fiber webs are produced in a fiber web producing process. As known from the prior art in fiber web producing processes typically comprise an assembly formed 3 by a number of apparatus arranged consecutively in the process line. A typical
N production and treatment line comprises a head box, a wire section and a press
N section as well as a subseguent drying section and a reel-up. The production and e 30 treatment line can further comprise other devices and/or sections for finishing the
I fiber web, for example, a pre-calender, a sizer, a final-calender, a coating section. = The production and treatment line also typically comprises at least one slitter-winder & for forming customer rolls as well as a roll packaging apparatus.
LO
N
S 35 In production of fiber webs, for example in production of paper or board webs, sizing is Used to alter the properties of a fiber web by adding sizing agents, for example starch or other sizing agents. Sizing is used in order to improve paper web properties, in particular water resistance, water absorption properties, strength,
internal strength and bending stiffness. In addition, runnability as well as dusting tendency can be affected favorably. Sizing can be divided to internal sizing and surface sizing. In internal sizing the sizing agent is added to pulp in the wet end of the fiber web machine before forming. In surface sizing the sizing agent is added onto the surface of the fiber web typically at the dry end of the fiber web machine, typically passing the fiber web through a sizing nip formed between two sizing rolls.
In production of fiber webs, for example in production of paper or board webs, in coating, especially in pigment coating, onto surface of the fiber web is formed a layer of coating color at a coating station (a coater) typically followed by drying. The formation of a coating color can be divided in supplying the coating color onto the web surface, which is called the application of the coating color, as well as in the adjustment of final amount of coating color.
One important recently developed sizing and coating technigue is curtain sizing / curtain coating, which is suitable to size or to coat fiber webs, such as paper and board webs. By curtain sizing or coating good coverage of sizing agents or coating color on the fiber web surface to be sized or coated is achieved.
In utility model publication CN207277088U is disclosed a curtain coating temperature control system, which comprises a tank, a filter, a heat exchanger, a first water pump, a screen, and a coating equipment. The tank contains coating color and bottom of the tank is connected with a filter, and in the system the filter, the heat exchanger, the first water pump, the screen, and the coating equipment are sequentially set according to the flow direction of the paint. The heat exchanger is connected with an external water pipe for controlling the temperature of the coating 3 color. &
N In patent application publication WO2012041662A1 is disclosed a method for e 30 operating a device, and to a device for directly or indirectly applying liquid or paste-
I like application media to a material web, in particular to a fiber material web in the = form of at least one free falling curtain by at least one application device and having & an application medium supply system connected with the application device, a comprising a degassing device. Temperature of the application medium in the
S 35 region of the degassing device is set lower than the temperature in the region of the application device.
The present invention relates to treatment of the fiber web by curtain sizing and/or curtain sizing by a curtain application device. The curtain application device in a treatment system is connected to a supply system of a treatment system, which provides the treatment substance for the curtain application by the curtain application device. Curtain application is very sensitive to temperature, especially in view of stability and steadiness of the curtain, which depends on viscosity of the treatment substance which in turn depends substantially on the temperature of the treatment substance. In prior art solutions thus, the temperature of the treatment substance, especially in connection with application of a sizing agent, in particular in production of liner or fluting fiber web grades, has been kept as hot as possible, especially to increase penetration of sizing agent.
One disadvantage in connection with supply systems known from prior art is that a supply system is suitable for only one type of treatment substance, for example for a sizing agent or for a coating color or for a pigmented sizing agent or for treatment substances with substantially similar properties. Thus, in case a treatment substance is to be changed to a different type of treatment substance or to treatment substance with substantially different properties the whole supply system or at least significant components and/or parts and/or elements of the supply system is needed to be replaced.
Summary
An object of the invention is to create a supply system of a treatment system for treatment of a fiber web, in particular a curtain sizing or coating method and device, in which the disadvantages of the prior art are eliminated or at least minimized.
N
N A particular, non-binding object of the invention a supply system of a treatment
N system for treatment of a fiber web, in particular a curtain sizing or coating method e 30 and device, which is suitable for different types of treatment substances of for
I treatment substances with substantially different properties without need to replace = the whole system.
S a To achieve the objects mentioned above and those that will be discussed later the
S 35 supply system of the treatment system according to the invention is mainly characterized by the features of the characterizing part of the independent supply system claim.
Advantageous features and embodiments of the invention are defined in the dependent claims.
According to the invention the supply system of a treatment system for application of a treatment substance of a fiber web comprises the supply system and an application system, which application system comprises at least one curtain application device, which application system is connected to the supply system for receiving the treatment substance from the supply system for applying the treatment substance to a fiber web directly or indirectly as a curtain created by the curtain application device, which supply system comprises a treatment system feed configured to feed a treatment substance to the supply system, a water feed configured to feed water to the treatment substance flow in the supply system, a machine tank, a screening device configured to screen the treatment substance, wherein the supply system comprises a comprehensive temperature control system comprising the water feed and the steam feed for controlling the temperature of the treatment substance in the supply system to provide the treatment substance to the application device at a desired temperature range, and the supply system comprises at least one measurement device configured to provide measurement information to the temperature control system for controlling the temperature of the treatment substance.
According to an advantageous feature of the invention at least one measurement device configured to provide measurement information to the temperature control system for controlling the temperature of the treatment substance is a temperature measurement device. 3 According to an advantageous feature of the invention the water feed comprises two
N water inlets: a hot water inlet and a cold water inlet, and by adjusting the amount of
N water fed through each of the water inlets the temperature of the fed water is e 30 controlled to control the temperature of the treatment substance flow. = = According to an advantageous feature of the invention the supply system further & comprises a pigment substance tank configured to be selectively connected to the a supply system and configured to, when connected, add pigments to the treatment
S 35 substance flow.
According to an advantageous feature of the invention the supply system is configured to provide different types of treatment substances, for example a sizing agent or a coating color or a pigmented sizing agent, or treatment substances with substantially different properties to the curtain application device without replacement of the supply system or its parts or elements. 5 According to an advantageous feature of the invention the machine tank of the supply system comprises a mixer and/or that the machine tank of the supply system comprises a steam feed configured to selectively add steam to the treatment substance in the machine tank to control the temperature of the treatment substance flow and/or that the machine tank is insulated.
According to an advantageous feature of the invention a temperature measuring device is located in connection with the machine tank and based on measurement results of the temperature measuring device the steam feed is configured to provide steam to the treatment substance in the machine tank to control the temperature of — the treatment substance.
According to an advantageous feature of the invention the supply system comprises a surfactant feed configured to feed surfactant chemicals to the treatment substance in the supply system.
According to an advantageous feature of the invention the supply system comprises a viscosity measurement device for measuring the viscosity of the treatment substance configured to provide measurement results for controlling temperature of the water feed and/or the steam feed of the machine tank based on the measurement results of the viscosity measurement device and/or configured to provide measurement results to the comprehensive temperature control system for 3 controlling the temperature treatment substance.
O
N
N According to an advantageous feature of the invention the supply system comprises e 30 a dry substance measurement device for measuring the dry substance content of
I the treatment substance. a & According to an advantageous feature of the invention the supply system comprises a at least one mass flow measurement device located before the application device
S 35 for measuring the mass flow of the treatment substance.
According to an advantageous feature of the invention the supply system comprises a return line from the application device, which is configured to provide a by-pass flow to control cross-directional profile of the treatment substance to be applied by the application device.
According to an advantageous feature of the invention the supply system comprises areturn line from the application device and a filter configured to remove impurities from the treatment substance.
According to an advantageous feature of the invention the supply system comprises a return line from the application device and a mass flow measurement device located in connection with the return line.
According to an advantageous feature of the invention the supply system further comprises an air removal device for removing air from the treatment substance.
According to an advantageous aspect of the invention the supply system of the treatment system of application of the treatment substance on the fiber web comprises a comprehensive temperature control system for controlling the temperature of the treatment substance in the supply system to provide the treatment substance to the application device at a desired temperature range. In accordance with this very advantageous aspect of the invention the supply system comprises temperature control of the treatment substance by water feed, which is configured to apply water to a feed line of the supply system in desired temperature.
This provides the possibility of controlling viscosity of the treatment substance by controlling the temperature of the treatment substance, especially by the controlling 3 the temperature of dilution water already at this stage i.e. during supply system /
N machine circulation stage of the treatment substance application. Surprisingly, even
N a relatively small change in the temperature has a significant change in viscosity, e 30 when especially a treatment substance with high dry solids content is applied. = = Advantageously, for the temperature control of the treatment substance the water & feed may comprise two water inlets — hot and cold water inlet, and by adjusting the a amount of water fed through each of the water inlets the temperature of the fed
S 35 water can be controlled and thus, the temperature of the treatment substance flow, wherein the water is added through the water feed. Advantageously, the temperature of the water from hot water inlet is 55-90°C, advantageously 70-80 °C,
more advantageously 70-75 °C, and the temperature of the water from the cold water inlet is 15-25°C.
The temperature of the water feed may also be controlled by controlling the temperature of the water to be fed in a water mixing unit located before the water feed. The supply system may also comprise a steam feed to a machine tank of the supply system and the temperature of the treatment substance in the machine tank is controlled by controlling the amount of steam to be fed via the steam feed into the machine tank. Advantageously, the supply system comprises at least one temperature measuring device, which is advantageously in connection with the machine tank. Thus, advantageously the temperature of the treatment substance is controlled by controlling the amount of the steam to be fed to the machine tank based on the measurement result of the temperature measuring device located in connection with the machine tank. Advantageously, the machine tank comprises insulation to further enhance the temperature control of the treatment substance.
The comprehensive temperature control of the supply system provides for the possibility of using the supply system for different types of treatment substances or treatment substances with different properties, as different types of treatment substances / treatment substances with different properties require different temperatures for successful application. The comprehensive temperature control of the supply system provides also improved application of the treatment substance by the curtain application device of the application system, as curtain application is very sensitive to temperature of the treatment system in order to be successful. By the comprehensive temperature control the temperature of the treatment substance is controlled to be at a desired level required by the treatment substance type and/or the treatment substance properties to be applied i.e. not as hot as possible. The 3 required temperature thus depends greatly on the treatment substance type and/or
N the treatment substance properties of the treatment substance to be applied. The
N temperature control of the machine tank also provides for keeping the treatment e 30 substance in the machine tank for example during stops and breaks at required
I temperature. In respect of properties of the treatment substances the = comprehensive temperature control of the supply system is also very important as & retaining the properties of certain types of treatment substances the temperature a must be kept at the required level as in cases where the temperature deviates from
S 35 the required level the properties may irrevocably change and thus, the treatment substance would no longer be utilizable.
According to an advantageous aspect of the invention the supply system of the treatment system of application of the treatment substance on the fiber web comprises a machine tank with a mixing device connected via the supply system to a curtain application device of the application system of the treatment system. This provides for improved application of the treatment substance as the treatment substance is well mixed as well as has coherent temperature.
According to an advantageous aspect of the invention the supply system of the treatment system of application of the treatment substance on the fiber web can be utilized without replacement of the supply system or the treatment system or its parts or elements in curtain application of different types of treatment substances, for example a sizing agent or a coating color or a pigmented sizing agent, or for treatment substances with substantially different properties.
The treatment substance can be a sizing agent for example starch, carboxy methyl cellulose (CMC), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA) or other synthetic or bio-based polymer latexes. The treatment substance can be a pigmented sizing agent or a coating color for example binder chemical or mixture of binder chemicals e.g. starch with mineral pigments and/or fillers. The treatment substance can be a cellulose based material e.g. micro-fibrillated cellulose (MFC), nano-fibrillated cellulose (NFC), nanocrystalline cellulose (NCC), cellulose nano- whiskers (CNW) or microcrystalline cellulose (MCC) or the treatment substance can be a cellulose based composite. The treatment substance can be a lignin based chemical or a mixture of those. The treatment substance can also be another bio- polymer like chitosan, alginate, bio-polyester, polyhydroxyalkanoate, or a mixture of those.
N
N According to an advantageous aspect of the invention the supply system of the
N treatment system of application of the treatment substance on the fiber web e 30 comprises a pigment substance tank, in which pigments are added to the treatment
I substance, and which treatment substance with the pigment addition is then guided = to a machine tank with a mixing device for providing a uniform treatment substance & for application by a curtain application device of the application system of the a treatment system.
S 35
By the invention and its advantageous features and aspects many advantages and benefits are achieved.
In this description and the following claims by fiber webs are meant in particular paper and board webs. Also, in this description and the claims by treatment of the fiber web is meant sizing and/or coating of the fiber web and thus, by treatment substance sizing agent and/or a pigmented sizing agent and/or coating color, respectively.
The exemplifying embodiments of the invention presented in this patent application are not to be interpreted to pose limitations to the applicability of the appended claims. The verb "to comprise" and its derivatives are used in this patent application as an open limitation that does not exclude the existence of also unrecited features.
The features described hereinafter are mutually freely combinable unless explicitly stated otherwise.
Brief description of the drawings
In the following the invention is further explained in detail with reference to the accompanying drawing in which:
In figure 1 is schematically shown an advantageous example of a treatment system.
Detailed description
In the following description same reference signs designate for respective components etc. unless otherwise mentioned and it should be understood that the examples are susceptible of modification in order to adapt to different usages and 3 conditions. &
N In the example of figure 1 is schematically shown an example of a supply system e 30 20 for supplying a treatment substance in a treatment system 10. The treatment
I system 10 comprises the supply system 20 and an application system 30. The = application system 30 comprises at least one rotating treatment roll 32, typically two & treatment rolls between of which a treatment nip is formed, and at least one curtain a application device 31, typically in cases with two treatment rolls, each treatment roll
S 35 has its own curtain application device. In the treatment nip the treatment substance is applied to a moving fiber web passing through the treatment nip. The treatment substance can be applied to one or both sides of the fiber web directly or indirectly.
In direct application the treatment substance is applied directly onto the fiber web and in indirect application the treatment substance is at first applied onto the treatment roll 32 and transferred via the surface of the treatment roll to the fiber web.
Also in the typical case of treatment systems 10 with two treatment rolls, for each there is a supply system 20 for supplying the treatment substance to the application system 30 or there is a common supply system 20 for both of the treatment substance rolls 32. So in the example of figure 1 is shown substantially half of the overall arrangement of the typical treatment system 10.
The supply system 20 of the treatment system 10 comprises a feed line 11 to feed atreatment substance from a treatment system feed TS to the supply system 20 for further processing of the treatment substance and finally to feed the treatment substance to the application device 31 of the application system 30. When the treatment substance flows in the feed line 11 from a water feed WL hot and/or cold water can be added to the treatment substance flow in the feed line 11. The water feed may comprise two water inlets — hot and cold water inlet, and by adjusting the amount of water fed through each of the water inlets the temperature of the fed water can be controlled.
From a surfactant feed SF surfactant chemicals can be added to the treatment substance flow in the feed line 11. In case the treatment substance pigments are to be added the treatment substance flow is guided from the feed line 11 to a line 12 to a pigment substance tank 21, in which pigments are added to the treatment substance.
There after the treatment substance flow is returned to the feed line 11 via a line 13 from the pigment substance tank 21 to the feed line 11. Then the treatment 3 substance flow is guided to a machine tank 22, in which steam via a steam feed S
N can be added to the treatment substance and the treatment substance is mixed by
N a mixer 23. In connection with the machine tank 22 a temperature measurement e 30 device TM is located for measuring the temperature of the treatment substance.
I Based on the results of the temperature measurement the temperature of the = treatment substance in the machine tank 22 is controlled by adding steam via the & steam feed S, if needed. The temperature measurement device TM may also be a located for example in connection with the line 14 from the machine tank 22 to the
S 35 screening device 25.
From the machine tank 22 the treatment substance flow is pumped by a pump 24 via a line 14 from the machine tank 22 to a screening device 25, in which the treatment substance is screened. The screening device 25 is for example a filter or a basket filter or a screen or a pressure screen. The screening device has advantageously screening accuracy of 200-400 um. Before the screening device 25 in the line 14 from the machine tank 22 to the screening device 25 a viscosity measurement device VIM is located for measuring the viscosity of the treatment substance for controlling temperature of the water feed WL and/or the steam feed
S of the machine tank 22 based on the measurement results of the viscosity measurement device VIM. Based on the measurement of the viscosity measurement device VIM the viscosity, especially the temperature of and water addition to the treatment substance is adjusted such, that the viscosity remains in required range. The viscosity measurement result can also be used to verify the correct temperature of the treatment substance before application.
From the screening device 25 the treatment substance flow is guided to an air removal device 26 via a line 15 from the screening device 25 to the air removal device 26. The air removal device 26 removes air from the treatment substance. In curtain application in respect of the curtain stability it is advantageous that in the treatment substance amount of substantial air bubbles is minimized, which air bubbles otherwise might disturb the curtain.
From the air removal device 26 the treatment substance flow is guided to the application device 31 of the application system 30 via a line 16 from the air removal device 26 to the application device 31. Along the line 16 from the air removal device 26 to the application device 31 a dry substance measurement device DSM for measuring the dry substance content of the treatment substance and a mass flow measurement device FIM1 for measuring the mass flow of the treatment substance 3 are located. Along the line 16 from the air removal device 26 to the application
N device 31 before the dry substance measurement device DSM there can also be
N located a heat exchanger with a temperature measurement device TM. Based on e 30 the dry substance measurement results of the dry substance measurement device
I DSM is verified to be in the required range and based on the mass flow - measurement results of the measurement device FIM1 the mass flow is verified to & be on the correct level.
S
S 35 After the air removal device 26 a by-pass line 17 branching from the line 16 from the air removal device 26 to the application device 31 for the treatment substance flow or part of it by-passing the application system 30, if needed due to application process reasons such, that treatment substance flow is not guided to the application device 31 of the application system 30 for example in cases of a web break or other break in the production of the fiber web.
From the application device 31 there is a return line 18 from the application device 31 toa filter 27. Via the return line 18 from the application device 31 to the filter 27 the treatment substance not used for application is guided back in the process. This return flow of the treatment substance via the return line 18 comprises for example treatment substance doctored during the application, or treatment substance from the beginning or ending stage of the application. This return flow of the treatment substance via the return line 18 can also be utilized as a by-pass flow to by-pass the application device to control cross-directional profile of the treatment substance to be applied by the application device 31. In connection with the return line 18 from application device 31 to the filter 27 a mass flow measurement device FIM2 is located for measuring the mass flow of the treatment substance flow.
The measurement results of the mass flow measurement device FIMI1 located before the application device 31 in the line 16 and the measurement results of the mass flow measurement device FIM2 in the return line 18 can be combined to check the amount of the treatment substance applied onto the fiber web.
In the filter 27 the treatment substance is filtered for removal of for example any impurities, for example fibers detached from edges of the fiber web. From the filter 27 the treatment substance flow is guided back to the feed line 11 to a point before the machine tank 22 to be used again. Thus, the filter 27 also protects the screening device 25 as the impurities have been removed from the return flow of the treatment substance entering back to the feed side or the supply system.
N
N The different measurement results from the different measurement devices of the
N supply system may be connected to a control system of the treatment system and/or e 30 the supply system to form a closed loop control. The control of the supply system
I and/or the treatment system may also be based on manual control based on the = measurement results of the measurement devices in the supply system.
S a In the description in the foregoing, although some functions and elements have been
S 35 described with reference to certain features, those functions and elements may be performable by other features whether described or not. Although features have been described with reference to certain embodiments or examples, those features may also be present in other embodiments or examples whether described or not.
Above the invention has been described by referring to some advantageous examples only, to which the invention is not to be narrowly limited. Many modifications and alterations are possible within the inventive idea.
N
QA
O
N
N
-
N
I a a
O
N
N
LO
N
N
O
N
Reference signs used in the drawing: 10 treatment system 11 feed line 12 line to pigment substance tank 13 line from pigment substance tank 14 line from machine tank to screening device 15 line from screening device to air removal device 16 line from air removal device to application device 17 by-pass line from air removal to return line 18 return line from application device to filter 19 return line from filter to feed line 20 supply system 21 pigment substance tank 22 machine tank 23 mixer 24 pump 25 screening device 26 air removal device 30 application system 31 curtain application device 32 treatment roll
P pigment feed
S steam feed
SF surfactant feed
N TS treatment substance feed
N FIM1, FIM2 mass flow measurement device
N DSM dry substance measurement device e 30 TM temperature measurement device
I VIM viscosity measurement device + WL water, hot or cold, feed
N
N

Claims (15)

Claims
1. Supply system of a treatment system for application of a treatment substance of a fiber web, which treatment system (10) comprises the supply system (20) and an application system (30), which application system (30) comprises at least one curtain application device (31), which application system (30) is connected to the supply system (20) for receiving the treatment substance from the supply system (20) for applying the treatment substance to a fiber web directly or indirectly as a curtain created by the curtain application device (31), which supply system comprises - a treatment system feed (TS) configured to feed a treatment substance to the supply system (20), - a water feed (WL) configured to feed water to the treatment substance flow in the supply system (20), - a machine tank (22), - a screening device (25) configured to screen the treatment substance, characterized in that the supply system (20) comprises a comprehensive temperature control system comprising the water feed (WL) and the steam feed (S) for controlling the temperature of the treatment substance in the supply system to provide the treatment substance to the application device at a desired temperature range, and N - that the supply system (20) comprises at least one measurement device A (TM; VIM) configured to provide measurement information to the temperature n 25 control system for controlling the temperature of the treatment substance. N
E
2. Supply system according to claim 1, characterized in that at least one n measurement device configured to provide measurement information to the
N . N temperature control system for controlling the temperature of the treatment N substance is a temperature measurement device (TM). O N
3. Supply system according to claim 1 or 2, characterized in that the water feed (WL) comprises two water inlets: a hot water inlet and a cold water inlet, and by adjusting the amount of water fed through each of the water inlets the temperature of the fed water is controlled to control the temperature of the treatment substance flow.
4. Supply system according to any of claims 1 - 3, characterized in that the supply system further comprises a pigment substance tank (21) configured to be selectively connected to the supply system (20) and configured to, when connected, add pigments to the treatment substance flow.
5. Supply system according to any of claims 1 - 4, characterized in that the supply system (20) is configured to provide different types of treatment substances, for example a sizing agent or a coating color or a pigmented sizing agent, or treatment substances with substantially different properties to the curtain application device (31) without replacement of the supply system or its parts or elements.
6. Supply system according to any of claims 1 - 5, characterized in that the machine tank (22) of the supply system (20) comprises a mixer (23) and/or that the machine tank (22) of the supply system (20) comprises a steam feed (S) configured to selectively add steam to the treatment substance in the machine tank (22) to control the temperature of the treatment substance flow and/or that the machine tank (22) is insulated.
7. Supply system according to any of claims 1 - 6, characterized in that a N temperature measuring device (TM) is located in connection with the O machine tank (22) and that based on measurement results of the temperature N measuring device (TM) the steam feed (S) is configured to provide steam to A the treatment substance in the machine tank (22) to control the temperature - 30 of the treatment substance. a
N 8. Supply system according to any of claims 1 - 7, characterized in that the N supply system (20) comprises a surfactant feed (SF) configured to feed N surfactant chemicals to the treatment substance in the supply system (20). N
9. Supply system according to any of claims 1 - 8, characterized in that the supply system (20) comprises a viscosity measurement device (VIM) for measuring the viscosity of the treatment substance configured to provide measurement results for controlling temperature of the water feed (WL) and/or the steam feed (S) of the machine tank (22) based on the measurement results of the viscosity measurement device (VIM) and/or configured to provide measurement results to the comprehensive temperature control system for controlling the temperature treatment substance.
10. Supply system according to any of claims 1 - 9, characterized in that the supply system (20) comprises a dry substance measurement device (DSM) for measuring the dry substance content of the treatment substance.
11. Supply system according to any of claims 1 - 10, characterized in that the supply system (20) comprises at least one mass flow measurement device (FIM1) located before the application device (31) for measuring the mass flow of the treatment substance.
12. Supply system according to any of claims 1 - 11, characterized in that the supply system (20) comprises a return line (18) from the application device (31), which is configured to provide a by-pass flow to control cross-directional profile of the treatment substance to be applied by the application device (31).
13. Supply system according to any of claims 1 - 12, characterized in that the supply system (20) comprises a return line (18) from the application device (31) and a filter (27) configured to remove impurities from the treatment N substance. O N 25
14. Supply system according to any of claims 1 - 13, characterized in that the T supply system (20) comprises a return line (18) from the application device N (31) and a mass flow measurement device (FIM2) located in connection with E the return line (18). &
15. Supply system according to any of previous claims 1 - 14, characterized in a 30 that the supply system further comprises an air removal device (26) for S removing air from the treatment substance.
FI20225223A 2022-03-14 2022-03-14 Supply system of a treatment system of application of a treatment substance of a fiber web FI130270B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FI20225223A FI130270B (en) 2022-03-14 2022-03-14 Supply system of a treatment system of application of a treatment substance of a fiber web
ATA50164/2023A AT525941B1 (en) 2022-03-14 2023-03-06 DELIVERY SYSTEM FOR A TREATMENT SYSTEM FOR APPLYING A TREATMENT AGENT TO A FIBER WEB
DE102023105446.5A DE102023105446A1 (en) 2022-03-14 2023-03-06 Delivery system for a treatment system for applying a treatment agent to a fibrous web

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20225223A FI130270B (en) 2022-03-14 2022-03-14 Supply system of a treatment system of application of a treatment substance of a fiber web

Publications (2)

Publication Number Publication Date
FI20225223A1 FI20225223A1 (en) 2023-05-30
FI130270B true FI130270B (en) 2023-05-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (3)

Country Link
AT (1) AT525941B1 (en)
DE (1) DE102023105446A1 (en)
FI (1) FI130270B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6284100B1 (en) * 1997-01-24 2001-09-04 Valmet Corporation Method and apparatus for controlling a headbox in a paper machine
FI982625A (en) * 1998-12-04 2000-06-05 Valmet Automation Inc Method and apparatus for adjusting paper properties

Also Published As

Publication number Publication date
FI20225223A1 (en) 2023-05-30
AT525941B1 (en) 2024-03-15
AT525941A3 (en) 2023-10-15
AT525941A2 (en) 2023-09-15
DE102023105446A1 (en) 2023-09-14

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