US20200181846A1 - Method and device for producing nano films - Google Patents

Method and device for producing nano films Download PDF

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Publication number
US20200181846A1
US20200181846A1 US16/329,849 US201716329849A US2020181846A1 US 20200181846 A1 US20200181846 A1 US 20200181846A1 US 201716329849 A US201716329849 A US 201716329849A US 2020181846 A1 US2020181846 A1 US 2020181846A1
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US
United States
Prior art keywords
conveyor belt
slurry
drying
heating elements
infrared heating
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.)
Abandoned
Application number
US16/329,849
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English (en)
Inventor
Bernd Suttner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumet Technologies Ltd & Co KG
Original Assignee
Sumet Technologies Ltd & Co KG
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Filing date
Publication date
Application filed by Sumet Technologies Ltd & Co KG filed Critical Sumet Technologies Ltd & Co KG
Publication of US20200181846A1 publication Critical patent/US20200181846A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/001—Drying webs by radiant heating
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/001—Drying webs by radiant heating
    • D21F5/002—Drying webs by radiant heating from infrared-emitting elements
    • 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
    • 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
    • D21H11/20—Chemically or biochemically modified fibres
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating

Definitions

  • the invention relates to a method for producing nanofilms and to an apparatus for doing so.
  • Plastic films and in particular thin plastic films are almost universally used as packaging materials, both for shopping bags and for films used as a component in food packaging.
  • foils can be brought back into the production cycle or at least put to use through incineration.
  • disintegrating films which end up as plastic nanoparticles, have caused a considerable concentration in bodies of water.
  • AT 516198 A1 has disclosed a method for producing a product composed of a bioplastic that contains nanofibers.
  • This is understood to be a biosynthetic that is produced from biopolymers and contains nanocellulose fibers.
  • the method for producing the nanofiber-containing bioplastic includes applying and distributing a compound of the bioplastic with the nanofibers in a fluid state onto a surface of at least one support that is moving in a rotation direction and transporting the bioplastic compound, which has been applied to and distributed on the surface of the at least one support, in the rotation direction of the at least one support. It is also specified that the nanofiber-containing bioplastic is at least partially dried and also that the partially dried compound is detached from the surface.
  • US 2010/0124651 A1 has disclosed a method for producing a thin layer of nanocellulose.
  • the layer is applied directly to the surface of a plastic backing material so that the nanocellulose fibers form a thin layer.
  • the nanocrystalline suspension in this case is applied to an impermeable fabric belt on which a first drying process is then begun, this drying process being carried out with hot air.
  • a first drying process is then begun, this drying process being carried out with hot air.
  • an additional fabric layer is placed onto the top surface of the film; this fabric layer is preferably semipermeable, with the intent being to produce a sandwich effect.
  • the semipermeable fabric layer should be able to allow liquids and gases to pass through.
  • a second drying is carried out, with the three-layer composite being rolled onto a cylindrical metallic dryer.
  • the dryer then conveys heat through the impermeable fabric; the heat causes the moisture in the nanocellulose film to evaporate and escape through the semipermeable fabric layer.
  • the two fabric layers are needed to stabilize the nanocrystalline film.
  • the three-layer composite can also be conveyed, via a plurality of dryer units. Only after the second drying has the nanocrystalline film gelled to the point that the film can be dried without the impermeable backing layer.
  • the second semipermeable backing layer is still needed, however, Only after leaving the third drying stage is the film stable enough that it can be further processed without backing layers. In this case, it is disadvantageous that this method is very complex, entails a high investment in equipment, and requires a surface treatment of the film.
  • US 2014/0255688 A1 has disclosed another method for producing a film out of nanocellulose; this film is likewise applied to at least one surface of a backing material.
  • This document discusses a plurality of solvents; the correspondingly produced suspension should contain two or more precisely, 0.25-2% by weight nanocellulose.
  • plasticizers such as glycol or sorbitol can be used.
  • the film is applied to the backing layer in such a way that a thickness of 50-150 ⁇ m is achieved. Then a drying is performed with hot air at 60-95° C., preferably 80° C.
  • the object of the invention is to create a method for producing films that can be used to produce environmentally friendly films based on renewable resources.
  • Another object is to create an apparatus for producing the films, which makes it possible to produce the films on a large industrial scale.
  • a film is made from nanocellulose.
  • the base material nanocellulose and nanofibers made of cellulose are basically known. Up to this point, however, large-scale processing has not been carried out since efforts in this direction have met with failure so that there have only been thin layers that are manually produced, but cannot meet the requirements of a film.
  • thin layers of this kind have been produced manually up to this point, have not been uniformly thick, and have also been much too thick for use as film. Apart from this, thin layers of this kind were more like a paper than a film.
  • nanofibers are dissolved in a suitable solvent. Due to the special nanofibers, a suitable solvent is desired because these fibers have an activated surface.
  • the solvent in this case can be an organic solvent, water, or a mixture thereof. In particular, it can take the form of alcohols or alcohol/water mixtures.
  • This formulation is completely homogenized by agitating or whipping.
  • At least deionized water is used or optionally, distilled water.
  • the receptacle is embodied with an appropriate agitating mechanism or the like.
  • gas can also be pumped through it. Basically, it is suitable to use any method that serves to prevent corresponding sedimentation in storage receptacles.
  • the discharge from the storage receptacle can be carried out with conventional, known metering pumps, with tubular or eccentric screw pumps being particularly suitable. Furthermore, compressed air-controlled containers can be used here. Even when supplying slurry, it is essential that no thickening, drainage, or separation takes place.
  • the application is carried out by means of a doctor blade, which can be profiled. It is also suitable to use a bar with an indentation ground into it, a corresponding blade-shaped outlet nozzle, a slot nozzle, or a so-called slide-die nozzle, or volume-controlled application nozzles.
  • the layer thickness is controlled by controlling the volume or more precisely stated, controlling the nozzle opening and the nozzle gap or using the appropriate doctor blade or scraper.
  • this can also be influenced by the speed at which the backing material is conveyed away.
  • the backing material is preferably a very smooth backing material, in particular a belt conveyor; the conveyor belt can be a metal or plastic conveyor belt.
  • a metal belt is used as the belt
  • a steel belt is used, for example, in particular a stainless steel belt that is corrosion-resistant.
  • such a metal belt has thicknesses of 0.5 to 0.35 mm and with very large widths and very large conveyor rollers, can even reach up to 1 mm thick or more.
  • plastics are also suitable, especially also PTFE belts or PTFE-coated belts.
  • the drying consists of three drying components.
  • a first component is the heated supporting belt.
  • the belt in this case is heated with hot rollers via heating lines, with metal belts being particularly advantageous in this context.
  • the temperature of the belt is set to 40 to 95° C.
  • a pre-drying can be carried out by means of short-wave to middle-wave infrared heating elements arranged in the longitudinal and transverse directions; preferably, a battery of heating elements is provided in which the individual heating elements can be separately regulated.
  • the air supply can be regulated during the infrared drying, i.e. if a transverse or longitudinal flow is present, which can adjust a corresponding vapor pressure in the material or above the material.
  • the belt can be routed, in an encapsulated fashion in a space that is closed off from the outside, thus permitting a selective ventilation and permitting the heat removal of both the heat that is introduced by means of the conveyor belt and the heat that is introduced by the infrared heating elements to be carried out with the appropriate ventilation.
  • the pre-dried slurry is then acted on with middle-wave or short-wave infrared heating elements with a high power density and individual controllability.
  • middle-wave or short-wave infrared heating elements with a high power density and individual controllability.
  • the large quantity of air required for the drying is selectively guided toward the slurry with diffuse outflows in order not to produce any pressure on the slurry.
  • an excessively direct guidance of air toward the material produces waves when the material is wet and produces cracks when the material is dry.
  • the material is optionally remoistened in order to establish a predetermined flexibility.
  • a complete drying of the material causes it to become relatively rigid and inflexible so that a remoistening can be used to establish a specific flexibility.
  • the remoistening in this case can take place in a vapor chamber or fog chamber in which a predetermined relative humidity is set and moisture is correspondingly supplied.
  • the film is detached from the supporting bed with the aid of doctor blades and undergoes an edge trimming.
  • the edge-trimmed, removed film is then wound onto a roll, with the rolling being performed by a torque-controlled winder drive.
  • This film is suitable in this context both for laminates for electrical industry and for food packaging, secondary food packaging, and as a replacement for plastic bags, gloves, and the like.
  • the slurry here is particularly applied with a bed thickness of 1 to 20 mm and, after drying and removal, achieves a thickness of 1 to 200 ⁇ m or more.
  • the thickness that is produced is achieved with a very high degree of uniformity; in the end, the film has a width of 1 m, for example, and it is easily possible to produce 50 m of film per minute, which approaches the realm of the commercially usable.
  • the system can also be used to produce mats or plates of nanomaterial, with a possible slurry application of 20 to 40 mm and up, depending on the lateral boundaries.
  • FIGURE here shows a very schematic side view of a corresponding apparatus.
  • the apparatus according to the invention for producing nanofilms 1 has a dispersing unit 2 ; the dispersing unit 2 has a receptacle 3 and an agitating or whipping mechanism 4 .
  • the dispersing unit 2 has a supply for nanofiber material and a supply for corresponding solvents.
  • the agitating or whipping device 4 in this case is preferably an electromotive device 4 with a corresponding agitating or whipping mechanism 5 ; the agitating or whipping mechanism 5 and the motor 4 are embodied so that rotation speeds of more than 1,000 revolutions per minute can be achieved and in addition, the agitating mechanism mixes and disperses the entire contents.
  • the slurry produced by means of this can be transferred to a storage receptacle 6 ; the storage receptacle 6 has corresponding supply devices for supplying the slurry from the dispersing unit 2 to the storage receptacle 6 .
  • the storage receptacle 6 likewise has an agitating mechanism 7 , which has a drive 8 and a corresponding agitator 9 ; these components are dimensioned so that they keep the slurry in the dispersed, non-separated state.
  • the slurry can be correspondingly supplied to an application device 13 .
  • the application device 13 in this case is a doctor blade and in this case, extends across the width of the system.
  • the slurry is poured from the application device 13 onto a conveyor belt 14 , which moves in accordance with the arrow direction 15 .
  • To tension the conveyor belt 14 at least one first roller 16 and one last roller 17 are provided; between the rollers 16 , 17 , there can be a plurality of additional support and heating rollers 18 .
  • the rollers 16 , 17 in this case rest with a partial circumference against the belt 14 , while the other rollers 18 preferably rest against the belt 14 in a supporting fashion over only a relatively narrow region of the belt.
  • rollers 16 , 17 , 18 are preferably all embodied as heatable, in particular electrically heatable; belt 14 temperatures of between 40 and 85° can be set.
  • the pre-drying device 19 is composed of a plurality of IR heating elements 20 arranged longitudinally relative to the travel direction 15 of the belt 14 and a plurality of IR heating elements 21 arranged transversely relative to the travel direction of the belt 14 .
  • a housing (not shown) around the entire pre-drying unit 19 , which shields the pre-drying unit from the outside atmosphere and the uncontrolled access by this atmosphere, but does provide a selective ventilation, e.g. a transverse ventilation by means of corresponding nozzles and corresponding opposing suction devices.
  • the pre-drying unit 19 is followed by the drying unit 22 ; the drying unit has at least one, but preferably a plurality of infrared heating elements 23 , which can be arranged similarly to the heating elements of the pre-drying unit, but can also be infrared heating elements that operate in particular spots and that can preferably be individually controlled.
  • the surface temperature of the slurry is measured and the heating intensity by means of the infrared heating elements can be adapted to a desired surface temperature, which can particularly vary from the entrance of the drying unit to the exit from the drying unit.
  • the drying unit 22 can also have a surrounding housing, which prevents the uncontrolled access by the surrounding atmosphere, but permits an appropriate supply of air or another gas.
  • the air or the gas whose relative humidity is adjusted so that it is able to absorb a particular quantity of moisture from the slurry 24 , is guided so that it flows through the region above the slurry 24 .
  • the drying unit 22 is followed by a remoistening device 25 , which can be embodied as a fog or humidity chamber or which brings about a defined remoistening in some other way.
  • the film 26 that is produced by means of this is removed from the last roller 17 , possibly with a corresponding removing blade (not shown), and is supported by a support roller 27 . It then travels over a spreader roller 28 to a winder 29 , where it is correspondingly wound.
  • an air ionization device or another device 30 for reducing or eliminating the charge can be provided.
  • rollers 31 In order to correspondingly guide and tension the conveyor belt, it is possible for other rollers 31 , particularly in the form of tension rollers 31 , to be correspondingly provided in the region of the lower run of the belt.
  • the invention has the advantage that for the first time, it is possible in a reproducible, high-quality method to produce a nanofiber film with a high degree of uniformity with regard to the thickness over both its length and width; the production is carried out in widths of 1 m and more and at speeds of 50 m per minute, which enables the method to be used commercially.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Moulding By Coating Moulds (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Coating Apparatus (AREA)
US16/329,849 2016-09-01 2017-08-17 Method and device for producing nano films Abandoned US20200181846A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016116308.2 2016-09-01
DE102016116308.2A DE102016116308A1 (de) 2016-09-01 2016-09-01 Verfahren und Vorrichtung zum Erzeugen von Nanofolien
PCT/EP2017/070846 WO2018041640A1 (de) 2016-09-01 2017-08-17 Verfahren und vorrichtung zum erzeugen von nanofolien

Publications (1)

Publication Number Publication Date
US20200181846A1 true US20200181846A1 (en) 2020-06-11

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Application Number Title Priority Date Filing Date
US16/329,849 Abandoned US20200181846A1 (en) 2016-09-01 2017-08-17 Method and device for producing nano films

Country Status (11)

Country Link
US (1) US20200181846A1 (ja)
EP (1) EP3507417B1 (ja)
JP (1) JP6974443B2 (ja)
KR (1) KR20190062418A (ja)
CN (1) CN109937277B (ja)
BR (1) BR112019004158A2 (ja)
DE (1) DE102016116308A1 (ja)
DK (1) DK3507417T3 (ja)
ES (1) ES2871864T3 (ja)
SI (1) SI3507417T1 (ja)
WO (1) WO2018041640A1 (ja)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5175103A (ja) * 1974-12-26 1976-06-29 Sumitomo Bakelite Co Kamizoshitsusochi
FI75008C (fi) * 1986-03-14 1992-02-17 Valmet Oy Svaevtork och foerfarande foer effektivering av dess funktion.
JP3785776B2 (ja) * 1997-12-08 2006-06-14 重直 圓山 印刷紙の乾燥方法及びその装置
US20100124651A1 (en) 2008-11-17 2010-05-20 Kruger Inc. Method of manufacturing nano-crystalline cellulose film
PL2717999T3 (pl) * 2011-06-07 2022-10-03 Core Energy Recovery Solutions Inc. Membrany do selektywnego przenoszenia pary wodnej zawierające warstwę z nanowłókien oraz sposoby ich wytwarzania
EP2645452B1 (en) * 2011-10-13 2015-04-15 Tokushu Tokai Paper Co., Ltd. Microporous membrane and manufacturing method therefor
FI123630B (fi) 2011-10-24 2013-08-30 Teknologian Tutkimuskeskus Vtt Menetelmä NFC-kalvojen valmistamiseksi alustoille
JP6132020B2 (ja) * 2013-06-03 2017-05-24 王子ホールディングス株式会社 微細繊維含有シートの製造方法
AT516198A1 (de) 2014-08-22 2016-03-15 Berndorf Band Gmbh Verfahren zur Herstellung eines Produktes aus einem Nanofasern enthaltenden Bioplastik

Also Published As

Publication number Publication date
DE102016116308A1 (de) 2018-03-01
EP3507417A1 (de) 2019-07-10
JP6974443B2 (ja) 2021-12-01
KR20190062418A (ko) 2019-06-05
JP2019526442A (ja) 2019-09-19
DK3507417T3 (da) 2021-05-25
CN109937277A (zh) 2019-06-25
CN109937277B (zh) 2021-12-28
SI3507417T1 (sl) 2021-07-30
WO2018041640A1 (de) 2018-03-08
ES2871864T3 (es) 2021-11-02
BR112019004158A2 (pt) 2019-08-06
EP3507417B1 (de) 2021-02-17

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