[go: up one dir, main page]

SE1550649A1 - Aerosol and foam formation using nanosized gas bubbles - Google Patents

Aerosol and foam formation using nanosized gas bubbles Download PDF

Info

Publication number
SE1550649A1
SE1550649A1 SE1550649A SE1550649A SE1550649A1 SE 1550649 A1 SE1550649 A1 SE 1550649A1 SE 1550649 A SE1550649 A SE 1550649A SE 1550649 A SE1550649 A SE 1550649A SE 1550649 A1 SE1550649 A1 SE 1550649A1
Authority
SE
Sweden
Prior art keywords
foam
paper
aerogel
aimed
aim
Prior art date
Application number
SE1550649A
Other languages
Swedish (sv)
Inventor
Heiskanen Isto
Backfolk Kaj
Original Assignee
Stora Enso Oyj
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 Stora Enso Oyj filed Critical Stora Enso Oyj
Priority to SE1550649A priority Critical patent/SE1550649A1/en
Priority to PCT/IB2016/052895 priority patent/WO2016185398A1/en
Publication of SE1550649A1 publication Critical patent/SE1550649A1/en

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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/56—Foam
    • 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
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • 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
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0085—Use of fibrous compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/002—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by using a foamed suspension
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/02—Foams characterised by their properties the finished foam itself being a gel or a gel being temporarily formed when processing the foamable composition
    • C08J2205/026—Aerogel, i.e. a supercritically dried gel
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C08J2205/042—Nanopores, i.e. the average diameter being smaller than 0,1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/02—Cellulose; Modified cellulose
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Paper (AREA)

Abstract

A method for producing an aerogel and/or foam for manufacturing of paper or paper board, and products thereof, wherein said paper or paper board is manufactured in a papermaking machine, wherein the aerogel and/or foam is formed from gas bubbles having a having a diameter of less than 0.5 micrometer.

Description

AEROSOL AND FOAM FORMATION USING NANOSIZED GAS BUBBLES Technical field The present document relates to a method for manufacturing paper and paper boardand products made thereof, wherein an aerogel or a foam made from nanosized gasbubbles is used.
Backgroundln today's paper making process the use of aerogel and foam has become increasingly interesting due to possibilities to make source reduction, water or energyefficient, cost saving and materials with improved or novel features. Foam forming ofpaper or foam coating of paper, in comparison to conventional wet laid forming, hasshown to provide a wide range of products having novel and beneficialcharacteristics of very even and high porosity structures, for products such as paper,paper board, tissue, hygiene products, insulation materials, composites, filters etc.The use of foam in the paper making process has also opened up for the possibilityto use new or traditional raw materials in new ways and in new combinations.
The aerogel or foam can be formed in different ways, conventionally water and air ismixed in presence of foam forming chemicals such as surface active agents e.g.surfactants or tensides, or surface active polymers or particles. The aerogel or foamcan also be formed by mechanically mixing fibers and water with foaming agents,such as surfactants or polymers that enables foam generation. lnWO2013/160553A1 one such paper or paper board foam forming method isdisclosed.
The preparation of smaller foam structures or nanofoam, sometimes also called anaerogel, is usually more challenging. The development of such a nanostructuredsystem is either highly energy demanding or requires a higher content of surfaceactive chemicals. ln liquid packaging board manufacturing the process today is quite complicated andlimited to certain chemicals, for example due to safety reasons, costs, and the factthat some chemicals are prohibited for use in food or liquid packaging applications.When forming a foam or an aerogel, there is often a need to use large quantities ofsurface active chemicals, which may remain in the paper or board product or causeproblems in the process (interfere with other chemicals) or cause weak boundaryinterfaces causing, for example, reduced fiber-fiber strength or reduced adhesion tolaminated polymer coatings. The surface active chemicals may also have a tendency to migrate and/or to negatively affect the barrier properties. These types of chemicalsare often not acceptable to use in the manufacturing of food packaging, or otherproducts, having high demands on the c|ean|iness of the product. Another drawbackof using surface active chemicals such as tensides is that they have hydrophilic partin their structure, which can cause problems in the end product. ln certain productsthere is further a requirement that the product must resist liquid pressure, for instancein hot filling or aseptic sterilization processes with hydrogen peroxide. lf there is anexternal pressure of liquid, the pore size and pore size distribution of the product orsubstrate becomes critical.
Studies have shown that in foam forming of paper products, the pore size of thesubstrate is highly dependent on the size of the bubbles in the foam, and that thebubble size of the foam can be affected by several parameters, such as the rotationalspeed of the mixer, the specific type of surfactant that is used, temperature,electrolyte concentration, pH, co-solvents, and the fibers with which the foam ismixed. When forming paper or board with foam forming techniques instead of usingthe conventional water forming, it has been shown that the pore size of the paperproduct is larger (Exceptional pore size distribution in foam-formed fibre networks, Al-Qararah, et al, Nordic Pulp and Paper Research Journal Vol 27, 2/2012, 226-230).There is thus a need for an energy efficient foam forming method of making paper orpaper board or products thereof, where the bubble size of the foam, and thus thepore size of the end product including the physical and mechanical properties can bemore easily controlled and adjusted.
Summarylt is an object of the present disclosure, to provide an improved method for providing or forming foam in a paper making process.
The object is wholly or partially achieved by a method according to theappended independent claim. Embodiments are set forth in the appended dependentclaims and in the following description.
According to a first aspect, there is provided a method for producing anaerogel and/or foam for manufacturing of paper or paper board, and productsthereof, wherein said paper or paper board is manufactured on a paper orpaperboard machine, wherein the aerogel and/or foam is formed from gas bubbleshaving a having a diameter of less than 0.5 micrometer.
By aerogel and/or foam is meant that depending on the other processproperties, either an aerogel or foam may be produced, or a mixture thereof. Thismethod of forming an aerogel or a foam from gas bubbles being of micro or evennanosize, i.e. so called micro- or nanobubbles, where the aerogel or foam is used in various aspects of paper making in the paper making machine, provides for anaerogel or foam in which the bubble size can more be easily controlled and adjustedfor the specific application of the aerogel or foam.
The IUPAC definition of an aerogel is a gel which comprised a microporoussolid in which the dispersed phase is a gas. However, an aerogel does not have adesignated material with set chemical formula but the term is use to group all thematerial with a certain geometric structure.
The term nanofoam is meant to encompass both the term aerogel and theterm foam in the present disclosure, where the aerogel or foam has been producedusing nanobubbles of gas.
That the nanobubbles have a diameter of less than 0.5 micrometer is meantthat a substantial fraction of the bubbles may be in this size region, but that theremay also be larger bubbles present in the gas.
This nanofoam may be produced using conventional means, such asmechanically, by cavitation or using ultrasound or by chemical means, e.g. suchchemicals that releases carbon dioxide gas.
The bubble size is also smaller in this nanofoam, than for conventionallyformed foams, which further means that the nanofoam is more stable. This meansthat for some applications of this nanofoam the pore size of the end product can bemade much smaller than with conventionally formed foams.
The nanofoam produced by using nanobubbles may further be more stablethan conventionally formed foams. By the nanofoam being “stable” is meant that thefoam bubbles do not easily collapse. This nanobubble foam may be more easily usedin the paper making machine, or may provide that the paper or paper board is moreeasily processed, e.g. improving runability or dewetting properties of web in thepaper making process.
The use of nanobubbles for forming the nanofoam further reduces or evenabolishes the need to use foam forming chemicals such as surfactants (tensides) orsurface active polymers.
According to one embodiment the aerogel and/or foam may be formed prior tointroduction into said papermaking machine.
According to an alternative embodiment said foam may be formed directly insaid papermaking machine. The aerogel and/or foam may be formed in a pulper ofthe papermaking machine. Alternatively the aerogel and/or foam may be formed in arefiner.
According to one embodiment the foam may be formed prior to introductioninto a head-box of the papermaking machine. This means that the nanobubbles mayfirstly be formed in a separate unit and then mixed with polymers, such as cellulosic fibers or alternatively with a foam. ln this way, the problem of creating nanobubbles ina viscous system may be avoided, since this might be difficult to achieve. Thenanofoam may for instance be injected into the headbox and then forming a foam-aerogel with other components.
The aerogel and/or foam may, according to one embodiment, be formeddirectly into a head-box of the papermaking machine. By formed directly in the head-box is meant that aerogel and/or foam is formed in-situ.
The aerogel and/or foam may, according to one alternative embodiment be,introduced as a coating material in the papermaking machine.
The foam may be introduced in a surface sizing step in the paper or boardprocess.
Sizing is used during paper manufacturing to reduce the paper's tendencywhen dry to absorb liquid. Liquid packaging board and coated fine papers are socalled hard sized papers that have the high water resistance. Surface sizing solutionsoften comprises the use of surface sizing agents such as acrylic co-polymers. lninternal sizing the chemicals used at the wet end are often alkyl succinic anhydride(ASA), alkyl ketene dimer (AKD) and rosin. By making the paper web morehydrophobic, the sizing agents influence dewatering and retention of fillers and fibersin the paper sheet.
Further, by introducing the nanobubbles in the sizing step, or wet end, andthen drying the paper or paper board a microbubble paper, laminate or paper boardmay be produced. This material has a very low density, and can be made withexisting manufacturing techniques. This paper may thus be a very porous material,for use for instance as a tissue product.
According to one embodiment of the first aspect the method may compriseintroducing said gas bubbles into any one of water, an aqueous fiber suspension,and an aqueous suspension comprising paper making chemicals or a mixturethereof.
This provides for a method in which the foam may be formed for instance byintroducing the nanobubbles into a stream of a fiber suspension, e.g. comprisingmicrofibrillated cellulose, thereby forming a fiber-foam composite which cansubsequently be introduced into the paper making machine as a coating of the web.
The foam may further be formed by introducing said gas bubbles into amixture of water and a surfactant.
According to one embodiment of the first aspect the gas may comprise anyone of atmospheric air, pure oxygen, pure nitrogen, pure carbon dioxide, or a mixturethereof.
According to one embodiment the diameter of the gas bubble may be in therange of from 0.01 pm to 10 pm, or in the range of from 0.01 pm to 1 pm, or in therange of from 0.01 pm to 0.8 pm, or in the range of from 0.01 pm to 0.6 pm, or in therange of from 0.01 pm to 0.5 pm, or the diameter of the gas bubbles comprises amixture of bubbles having different diameters in the range of 0.01 to 10 pm.
This means that the bubble size distribution can either be monodisperse, i.e. alarge fraction of the bubbles may have the same or substantially the same size, orpolydisperse, i.e. the gas bubbles may have different sizes ranging from nanosize tomicrosize bubbles. ln one embodiment a substantial fraction of the gas bubbles have a diameterwhich is less than 0.5 micrometers.
According to one embodiment said paper or paper board may be formed froma fibrous material comprising any one of microfibrillated polysaccharide and longercellulosic fibers, or a mixture thereof. The microfibrillated polysaccharide may forinstance be microfibrillated cellulose, cellulose whiskers or microcrystalline cellulose.
According to a second aspect there is provided a method for manufacturing apaper or paper board, wherein said paper or paper board, wherein said methodcomprises introduction of an aerogel and/or foam produced according to the firstaspect. By “comprises introduction of an aerogel and/or foam” is meant thenanofoam has been introduced in the furnish, in the coating or in the sizing of thepaper or paper board.
According to a third aspect there is provided a paper or paper board obtainedby the method according to the second aspect.
Detailed descriptionFoam is conventionally and broadly defined as a colloidal dispersion of gas in a liquid or solid medium. Foam can be generated in many different ways, for instancemechanically, by agitating a liquid medium, optionally with or without surface activeagents to promote the foam formation. Foams can also be produced chemically, forinstance through fermentation.
An aerogel is conventionally defined a material which is porous andnanostructured, and which has some specific properties such as high porosity andsurface area. An aerogel does not have a designated material with set chemicalformula, but the term is use to group all the material with a certain geometricstructure.
However, according to this disclosure, the foam, aerogel or nanofoam isproduced or formed by using gas bubbles. According to one embodiment an aerogel or a foam is formed from gas bubbles having a diameter of less than 500nanometers.
The aerogel and/or foam are thus formed from gas bubbles being of micro oreven nanosize, i.e. nanobubbles. This means that the foam or aerogel also isnanosized or nanostructured. ln the below description the term “nanofoam” is meantto encompass both an aerogel and a foam formed from these nanobubbles of gas.
The nanofoam may also be a material which is a mixture of an aerogel and afoam.
According to one embodiment the gas may be atmospheric air, i.e. a mixtureof oxygen, nitrogen and other gases present in the earth's atmosphere. According toanother embodiment the gas is oxygen (02). According to another embodiment thegas is nitrogen (Ng). According to yet another embodiment the gas is carbon dioxide(C02). According to one embodiment the gas is a mixture of different gases, such asa mixture of air and Ng, or air and C02. The gas may also be any other suitable gasor mixture of gases.
According to one embodiment the diameter of the gas or the so callednanobubble or microbubble is in the range of from 0.01 um to 10 um. ln oneembodiment the diameter of the nanobubble is in the range of from 0.01 um to 1 um.ln another embodiment the diameter of the nanobubble is in the range of from 0.01um to 0.8 um. According to yet an embodiment the diameter of the nanobubble is inthe range of from 0.01 um to 0.6 um. ln one embodiment the diameter is less than0.5 um. According to another embodiment the diameter is less than 0.4 um.According to yet another embodiment the diameter is less than 0.3 um. According toone embodiment the smallest bubble diameter may be about 0.03 um or in the rangeof from 0.03 to 0.07 um.
According to one embodiment there may be a mixture of gas bubbles havingdifferent diameters, i.e. a more polydisperse structure including both nanosized andmicrosized gas bubbles in a mixture, this means that there may be bubbles having adiameter which is more than 0.5 um. However, the main part or fraction of the gasbubbles used for forming the nanogel are preferably nanosized, i.e. having adiameter of less than 500 nanometers. This means that according to oneembodiment the gas bubbles have a monodisperse size distribution.
The nanofoam may be used in the paper or board manufacturing process, forinstance as furnish or as additive in a furnish, as a coating or additive in coating or ator in a sizing step in the process. The paper or board manufacturing process thus encompasses both so called foam forming processes and more conventionalprocesses such as wet laid paper processes or air laid paper processes.
The nanofoam itself may be formed in different ways using the gasnanobubbles.
According to one embodiment the nanobubbles of gas may be introduced intoa liquid suspension.
The liquid suspension may be an aqueous suspension comprising for instancedifferent types of fibrous materials, and/or different types of chemicals, such as foamforming chemicals, paper making additives (fillers etc), sizing chemicals and so on.
The nanofoam may for instance be formed by introducing the nanobubbles ofgas into a cellulose gel or suspension comprising microfibrillated cellulose (MFC). ltcan be a mixture of highly refined fibers (MFC), nanocellulose or cellulosenanocrystals (CNC), microcrystalline cellulose and traditional or conventional pulpfibers, or mixtures thereof.
According to one alternative embodiment synthetic fibers may be included inthe liquid suspension, such as e.g. polylactic acid (PLA), or polyvinyl alcohol (PVA) orpolyethylene terephthalate (PET) fibers.
According to one embodiment the nanofoam may be produced prior tointroducing it into the paper or board manufacturing process. This may be useful inapplications such as when the nanofoam is used for coating of a wet laid paper web,or when the foam is used in a sizing step in the paper or board manufacturingprocess.
According to one embodiment the nanofoam may be used as a furnish, i.e. inthe paper making pulp solution prior to its introduction into a papermaking machine,i.e. for instance in the pulper or refiner. This means that the nanofoam itself may beused to form the paper or paper board end product.
Through this alternative embodiment, products having a very high porositymay be obtained, for instance papers for tissue applications.
The nanofoam may also, according to another embodiment, be added into thepaper making process at different stages.
According to one alternative embodiment the nanobubbles of gas may beintroduced directly into the papermaking machine, such as in the cleaner, the head-box or in a sizing step, thus forming the nanofoam in-situ in the papermakingmachine.
The nanofoam may also be used as a coating and applied in the paper orboard manufacturing process at any coating step or stage. The nanofoam mayalternatively be mixed with other coating additives and chemicals.
According to one embodiment the nanofoam may be supplied to thepapermaking machine in a continuous manner. According to one embodiment thenanofoam may be fed into the head-box, to be mixed with the water and fibermixture, before forming the web in the wire section.
According to one embodiment the nanofoam may be fed onto the wire section together with the fiber and water mixture from the head-box.
According to one embodiment the nanofoam may be used in a sizing step inthe paper or board manufacturing process. By using a nanofoam it may be possibleto reduce the or even completely abolish the use of these different types of internaland surface sizing agents.
Further, by introducing the nanobubbles in the sizing step, or wet end, andthen drying the paper or paper board a microbubble paper, laminate or paper boardmay be produced. This material has a very low density, and can be made withexisting manufacturing techniques. This paper may thus be a very porous material,for use for instance as a tissue product.
According to one embodiment, the end product, when using the nanofoam inthe process, may be a thermoplastic product.
According to another embodiment the end product may be ply paper or anapplication of a ply paper, e.g. in a board application.
According to another embodiment the nanofoam may be used for paperboardapplications.
Other possible applications may include producing intermediate compositeswhich can be used in different types of subsequent applications in the paper or boardmaking process. ln view of the above detailed description of the present invention, othermodifications and variations will become apparent to those skilled in the art.However, it should be apparent that such other modifications and variations may beeffected without departing from the spirit and scope of the invention.

Claims (15)

1. A method for producing an aerogel and/or foam for manufacturing of paper orpaper board, and products thereof, wherein said paper or paper board ismanufactured in a papermaking machine, characterized inthatthe aerogel and/or foam is formed from gas bubbles having a having adiameter of less than 0.5 micrometer.
2. The method as c|aimed in c|aim 1, wherein said aerogel and/or foam is formedprior to introduction into said papermaking machine.
3. The method as c|aimed in c|aim 1, wherein said foam is formed directlyin said papermaking machine.
4. The method as c|aimed in c|aim 3, wherein the aerogel and/or foam is formedin a pu|per or refiner of the papermaking machine.
5. The method as c|aimed in c|aim 2, wherein the foam is formed prior tointroduction into a head-box of the papermaking machine.
6. The method as c|aimed in c|aim 3, wherein the aerogel and/or foam is formeddirectly into a head-box of the papermaking machine.
7. The method as c|aimed in c|aim 2, wherein the aerogel and/or foam isintroduced as a coating material in the papermaking machine.
8. The method as c|aimed in c|aim 2, wherein the foam is introduced in a sizingstep in the paper or board process.
9. The method as c|aimed in c|aim 2, wherein method comprisesintroducing said gas bubbles into any one of water, an aqueous fiber suspension,and an aqueous suspension comprising paper making chemicals or a mixturethereof.
10.The method as c|aimed in c|aim 9, wherein the foam is further formedby introducing said gas bubbles into a mixture of water and a surfactant.
11.The method as claimed in any one of the preceding claims, whereinthe gas comprises any one of atmospheric air, pure oxygen, pure nitrogen, purecarbon dioxide, or a mixture thereof.
12. The method as claimed in any one of the preceding claims, wherein the diameter of the gas bubble is in the range of from 0.01 um to 10 um, or in therange of from 0.01 um to 1 um, or in the range of from 0.01 um to 0.8 um, or in therange of from 0.01 um to 0.6 um, or in the range of from 0.01 um to 0.5 um, or thediameter of the gas bubbles comprises a mixture of bubbles having differentdiameters in the range of0.01 to 10 um.
13.The method as claimed in any one of the preceding claims, whereinsaid paper or paper board is formed from a fibrous material comprising any one ofmicrofibrillated polysaccharide and longer cellulosic fibers, or a mixture thereof.
14. A method for manufacturing a paper or paper board, wherein said methodcomprises introduction of an aeroge| and/or foam produced according to any one ofclaims 1 to 13.
15. A paper or paper board obtained by the method as claimed in c|aim14.
SE1550649A 2015-05-21 2015-05-21 Aerosol and foam formation using nanosized gas bubbles SE1550649A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE1550649A SE1550649A1 (en) 2015-05-21 2015-05-21 Aerosol and foam formation using nanosized gas bubbles
PCT/IB2016/052895 WO2016185398A1 (en) 2015-05-21 2016-05-18 Aerogel and foam formation using nanosized gas bubbles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1550649A SE1550649A1 (en) 2015-05-21 2015-05-21 Aerosol and foam formation using nanosized gas bubbles

Publications (1)

Publication Number Publication Date
SE1550649A1 true SE1550649A1 (en) 2016-11-22

Family

ID=56148614

Family Applications (1)

Application Number Title Priority Date Filing Date
SE1550649A SE1550649A1 (en) 2015-05-21 2015-05-21 Aerosol and foam formation using nanosized gas bubbles

Country Status (2)

Country Link
SE (1) SE1550649A1 (en)
WO (1) WO2016185398A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4153813A4 (en) * 2020-05-20 2024-05-22 Stora Enso Oyj A method for manufacturing a foam coated cellulose based substrate

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX380311B (en) 2015-11-03 2025-03-12 Kimberly Clark Co Paper tissue with high bulk and low lint
US10519606B2 (en) 2016-12-22 2019-12-31 Kimberly-Clark Wordlwide, Inc. Process and system for reorienting fibers in a foam forming process
KR20190136051A (en) 2017-04-28 2019-12-09 킴벌리-클라크 월드와이드, 인크. Foam-Formed Fiber Sheets with Crimped Staple Fibers
BR112020007694B1 (en) 2017-11-29 2022-12-13 Kimberly-Clark Worldwide, Inc METHOD FOR PRODUCING A MULTILAYER SUBSTRATE FORMED BY FOAM
DE102017130071A1 (en) * 2017-12-15 2019-06-19 Voith Patent Gmbh web treatment
US11313061B2 (en) 2018-07-25 2022-04-26 Kimberly-Clark Worldwide, Inc. Process for making three-dimensional foam-laid nonwovens
SE544302C2 (en) * 2019-12-18 2022-03-29 Stora Enso Oyj Coated paper or paperboard and a method for manufacturing a coated paper or paperboard

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003192991A (en) * 2001-12-25 2003-07-09 Oji Paper Co Ltd Water-based paint and coated sheet using the same
FI122073B (en) * 2003-10-02 2011-08-15 Teknologian Tutkimuskeskus Vtt Porous filler or coating pigments for paper and paperboard and their preparation
SE533092C2 (en) * 2008-02-29 2010-06-22 Stora Enso Oyj Process for electrostatic production of particles and manufacture of paper, cardboard or filters comprising the method
FI124235B (en) 2012-04-26 2014-05-15 Stora Enso Oyj Fiber-based paper or cardboard web and method of manufacturing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4153813A4 (en) * 2020-05-20 2024-05-22 Stora Enso Oyj A method for manufacturing a foam coated cellulose based substrate

Also Published As

Publication number Publication date
WO2016185398A1 (en) 2016-11-24

Similar Documents

Publication Publication Date Title
SE1550649A1 (en) Aerosol and foam formation using nanosized gas bubbles
Hjelt et al. Foam forming of fiber products: a review
US10364533B2 (en) Hydrophobically sized fibrous web and a method for the preparation of a sized web layer
FI124235B (en) Fiber-based paper or cardboard web and method of manufacturing the same
US10927503B2 (en) Method to form a web comprising fibers
JP6995771B2 (en) Method for Producing Film Containing Microfibrillated Cellulose
Li et al. Structure and performance control of plant fiber based foam material by fibrillation via refining treatment
CN115427485B (en) Multilayer membrane containing highly refined cellulose fibers
CN107709663B (en) Film products or method for producing films comprising amphiphilic polymers
CA3027830A1 (en) Process for creating a foam utilizing an antimicrobial starch within a process for manufacturing a paper or board product
KR20230026353A (en) Water resistant fibrous material and manufacturing method thereof
EP3423629B1 (en) Method of manufacturing 3d shaped articles
SE1851216A1 (en) An oxygen barrier layer comprising microfibrillated dialdehyde cellulose
KR20240112327A (en) Foam-assisted application of steam-free starch and dry strength agents to paper products
JP2023526800A (en) Method for producing foam-coated cellulosic substrate
CA3207789A1 (en) A method, a paperboard product and use of a foam coater and a subsequent high-consistency metering size press

Legal Events

Date Code Title Description
NAV Patent application has lapsed