US20140134346A1 - System and method for application of nano staple - Google Patents
System and method for application of nano staple Download PDFInfo
- Publication number
- US20140134346A1 US20140134346A1 US13/968,736 US201313968736A US2014134346A1 US 20140134346 A1 US20140134346 A1 US 20140134346A1 US 201313968736 A US201313968736 A US 201313968736A US 2014134346 A1 US2014134346 A1 US 2014134346A1
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- United States
- Prior art keywords
- substrate
- nanofiber
- tank
- applicator
- pump
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- 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.)
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/20—Arrangements for agitating the material to be sprayed, e.g. for stirring, mixing or homogenising
- B05B15/25—Arrangements for agitating the material to be sprayed, e.g. for stirring, mixing or homogenising using moving elements, e.g. rotating blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
- B05B7/1409—Arrangements for supplying particulate material specially adapted for short fibres or chips
Definitions
- Nanofibers are generally defined as fibers having a diameter of less than about 1000 nm in diameter and may have lengths from a few centimeters to less than one millimeter. Such fibers have come into use in various fields, including medical applications, protective materials, general textiles and filtration media.
- Electrospinning a high voltage is applied to a liquid droplet, charging the droplet. Electrostatic repulsion counteracts the surface tension of the liquid and, as the droplet is stretched, a stream of liquid erupts from the surface of the liquid as a liquid jet. As the jet dries, it forms the fiber, which is deposited on a collector.
- a liquid such as a polymer
- a stream of hot gas such as air.
- Thread or fibers are formed which are dried and collected on a collector by use of a vacuum applied through the collector.
- such a method has lower energy requirements than known systems, requiring less heat input to form such nanofibers.
- such a system and method produce nanofibers on a commercial scale that is less capital intensive than known systems and produces a higher output as well as a higher throughput than known systems.
- FIG. 1 is a schematic illustration of an exemplary system for the manufacture of nanofibers.
- FIG. 1 there is shown a schematic illustration of an exemplary system 10 for the application of nanofibers N onto a substrate S.
- the system 10 includes a feed tank 12 for storing a fluid, such as a liquid polymeric feed solution F, an outlet pump 14 , fluid conduits 16 , such as piping, hoses or the like, and an applicator head 18 .
- a control system or controller 20 monitors and controls the overall operation of the system 10 .
- a conveyor 22 can be used to move the substrate S along a path P relative to the applicator system 10 and head 18 .
- the tank 12 can be formed of any material suitable and/or compatible with the feed solution F. Such materials include, but are not limited to stainless steel, polypropylene or the like.
- the system 10 is configured to apply the nanofiber N solution to a substrate S.
- the nanofiber N can be applied to, for example, a coarse web, a fine web, a non- woven material or essentially any type or construction of suitable substrate.
- An agitator 24 is positioned in the tank 12 to maintain the nanofibers in solution.
- One agitator 24 is a multi-blade rotary agitator, preferably powered by a variable speed drive 28 .
- a variable speed drive 28 allows for controlling the consistency of the solution—that is maintaining the nanofiber evenly distributed and suspended in the solution, while minimizing over-working or over-agitating the solution and controlling the power consumption of the agitator 24 .
- agitators that can be used to maintain the nanofibers in solution.
- the outlet pump 14 provides a metered or precise fluid flow to the applicator head 18 .
- One type of pump 14 is a metering pump (or multiple metering pumps) to provide precise flow to the applicator head 18 .
- the fluid conduits 16 extending between the tank 12 and the pump 14 and the pump 14 and the applicator head 18 are configured to maintain the fiber in solution and to prevent the nanofibers from falling out of solution or settling in the piping or hoses 16 .
- the piping or hoses 16 between the various system components can be designed having straight runs to reduce or eliminate bends, or where necessary an increased the radius of curvature of bends.
- Conduits 16 having smooth internal surfaces to minimize flow resistance and interferences, cavities (or flow dead spots) and the like, can be used maintain a desired flow rate and/or velocity through the conduits 16 .
- One or more flow meters 30 properly positioned within the system 10 provide for monitoring the inlet of carrier fluid C (e.g., water) to the tank 12 and the flow of the nanofibers in solution N from the tank 12 .
- carrier fluid C e.g., water
- the materials of the conduits 16 and other process equipment are selected to be suitable and/or compatible with the nanofiber formulation.
- the applicator head 18 is configured as a building block-type expandable design in which sections can be added or removed depending on the width of the substrate S.
- the applicator head 18 sections can be made up of a variety of nozzle designs depending on the specific formulation and the intended coat weight of nanofibers on the substrate S.
- the applicator head 18 can atomize the formulation through pressure generated from the pump 14 at the outlet side of the tank 12 .
- Exemplary of such applicators are those described in Budai, U.S. patent application Ser. No. 13/547,685, which application is commonly assigned with the present application and is incorporated herein by reference in its entirety.
- the system 10 is controlled by the controller 20 .
- the controller 20 can, for example, monitor the line speed of the substrate S and vary the nanofiber formulation output flow based on the line speed of the substrate S, the density at which the nanofiber formulation is applied to substrate S (coating weight), the pump 14 outputs and inputs, and like process parameters.
- the controller 20 can also monitor and control the agitator 24 , process temperatures and the like. It is anticipated that the controller 20 will be of a menu driven type.
- the present system 10 is configured to apply nanofiber to a wide variety of substrates S.
- Exemplary nanofiber is that formulated from cellulose acetate, polypropylene, polyethylene, polyester, nylon, polyphthalamide (PPA), polymethyl methacrylate (PMMA), polyactic acid, poly aniline, poly vinyl alcohol, poly acrylonitrile and the like.
- PPA polyphthalamide
- PMMA polymethyl methacrylate
- polyactic acid poly aniline
- poly vinyl alcohol poly acrylonitrile
- suitable polymers will be appreciated by those skilled in the art.
- the polymer can be carried in a wide variety of suitable liquid carriers C, such as water.
- Other additives may be used to create a desired viscosity or nanofiber suspension, including for example, surfactants such as glycerin.
- a method of applying nanofibers to a substrate S includes providing a substrate and a system 10 for applying the nanofiber solution to the substrate and moving the substrate S and system 10 relative to one another. It is anticipated that the substrate S will move relative to the applicator head 18 .
- the method further includes conveying, from a storage vessel such as a tank 12 , a liquid formulation of nanofibers N in suspension, through one or more fluid conduits 16 , to the applicator head 18 .
- the fluid flow is carefully controlled and monitored. As such the flow can be measured, as by one or more flow meters 30 or like device, at the tank 12 outlet (e.g., the pumped fluid) and the flow rate monitored to ensure that a desired flow rate is maintained. To assure that the formulation in the tank 12 is maintained (e.g., the concentration of nanofibers in the solution), the carrier C inlet to the tank 12 can also be monitored.
- the formulation in the tank 12 e.g., the concentration of nanofibers in the solution
- the carrier C inlet to the tank 12 can also be monitored.
- the liquid formulation of nanofibers in suspension is transported through a system that reduces the number of bends or other interferences in flow.
- the method further includes applying the formulation to a substrate through an applicator head 18 such as that described above.
- the nanofiber formulation will be applied at a predetermined coat weight and may depend upon the specific formulation used and the intended use of the resultant coated substrate. It is anticipated that the formulation may be applied by spray, atomization (effected by pump pressure) or like methods.
- the present system 10 and method can greatly reduce the energy requirements for applying nanofibers N to substrates S. It is expected that the overall cost of nanofiber production can be reduced by as much as fifty percent with production yields being twenty times greater than known methods such as electrospinning The present process can be carried out at or about room temperature, thus greatly reducing the energy costs over known systems and methods.
- functional composites can be made by selectively incorporating materials such as silica, clay, silver particles, titanium and aluminum-based materials and the like.
- nanofibers can be produced for use in the medical, energy, filtration and lighting industries, as well as for use in general textiles.
Abstract
A system for the application of nanofiber to a substrate includes a tank having an outlet, an agitator disposed in the tank, a pump located at the tank outlet and an applicator disposed proximate to the substrate. One or more fluid conduits extend from the tank to the pump and from the pump to the applicator. The fluid conduits are configured so as to minimize bends and interferences. The system includes a controller. A nanofiber formulation in a fluid carrier in the tank is pumped from the tank to the applicator for application to the substrate at a predetermined flow rate. The pump is controlled by the controller to vary the output of the pump to match the predetermined flow rate, and the nanofiber formulation is applied by the applicator head at a predetermined coat weight on the substrate. A method for the application of nanofiber to a substrate is disclosed.
Description
- Nanofibers are generally defined as fibers having a diameter of less than about 1000 nm in diameter and may have lengths from a few centimeters to less than one millimeter. Such fibers have come into use in various fields, including medical applications, protective materials, general textiles and filtration media.
- Current processes for the commercial manufacture of nanofibers include electrospinning and meltblowing. In electrospinning, a high voltage is applied to a liquid droplet, charging the droplet. Electrostatic repulsion counteracts the surface tension of the liquid and, as the droplet is stretched, a stream of liquid erupts from the surface of the liquid as a liquid jet. As the jet dries, it forms the fiber, which is deposited on a collector.
- In meltblowing, a liquid, such as a polymer, is forced through a die having very narrow slots at high temperatures, with a stream of hot gas, such as air. Thread or fibers are formed which are dried and collected on a collector by use of a vacuum applied through the collector.
- Both of these processes are mechanically harsh on the fibers formed. In addition, these processes consume a significant amount of energy with low output, resulting in high cost per unit output. Moreover, there is significant capital required for the equipment to manufacture nanofibers using these known techniques.
- Accordingly, there is a need for a method and system for the manufacture of nanofibers. Desirably, such a method has lower energy requirements than known systems, requiring less heat input to form such nanofibers. Desirably such a system and method produce nanofibers on a commercial scale that is less capital intensive than known systems and produces a higher output as well as a higher throughput than known systems.
-
FIG. 1 is a schematic illustration of an exemplary system for the manufacture of nanofibers. - While the present disclosure is susceptible of embodiment in various forms, there is shown in the drawings and will hereinafter be described one or more embodiments with the understanding that the present disclosure is to be considered illustrative only and is not intended to limit the disclosure to any specific embodiment described or illustrated.
- Referring to the figures and in particular to
FIG. 1 , there is shown a schematic illustration of anexemplary system 10 for the application of nanofibers N onto a substrate S. Thesystem 10 includes afeed tank 12 for storing a fluid, such as a liquid polymeric feed solution F, anoutlet pump 14,fluid conduits 16, such as piping, hoses or the like, and anapplicator head 18. A control system orcontroller 20 monitors and controls the overall operation of thesystem 10. Aconveyor 22 can be used to move the substrate S along a path P relative to theapplicator system 10 andhead 18. - The
tank 12 can be formed of any material suitable and/or compatible with the feed solution F. Such materials include, but are not limited to stainless steel, polypropylene or the like. - The
system 10 is configured to apply the nanofiber N solution to a substrate S. The nanofiber N can be applied to, for example, a coarse web, a fine web, a non- woven material or essentially any type or construction of suitable substrate. - An
agitator 24 is positioned in thetank 12 to maintain the nanofibers in solution. Oneagitator 24 is a multi-blade rotary agitator, preferably powered by avariable speed drive 28. Avariable speed drive 28 allows for controlling the consistency of the solution—that is maintaining the nanofiber evenly distributed and suspended in the solution, while minimizing over-working or over-agitating the solution and controlling the power consumption of theagitator 24. Those skilled in the art will recognize other types of agitators that can be used to maintain the nanofibers in solution. - The
outlet pump 14 provides a metered or precise fluid flow to theapplicator head 18. One type ofpump 14 is a metering pump (or multiple metering pumps) to provide precise flow to theapplicator head 18. - The
fluid conduits 16 extending between thetank 12 and thepump 14 and thepump 14 and theapplicator head 18 are configured to maintain the fiber in solution and to prevent the nanofibers from falling out of solution or settling in the piping orhoses 16. For example, the piping orhoses 16 between the various system components can be designed having straight runs to reduce or eliminate bends, or where necessary an increased the radius of curvature of bends.Conduits 16 having smooth internal surfaces to minimize flow resistance and interferences, cavities (or flow dead spots) and the like, can be used maintain a desired flow rate and/or velocity through theconduits 16. One ormore flow meters 30 properly positioned within thesystem 10 provide for monitoring the inlet of carrier fluid C (e.g., water) to thetank 12 and the flow of the nanofibers in solution N from thetank 12. It will be understood that the materials of theconduits 16 and other process equipment are selected to be suitable and/or compatible with the nanofiber formulation. - The
applicator head 18 is configured as a building block-type expandable design in which sections can be added or removed depending on the width of the substrate S. Theapplicator head 18 sections can be made up of a variety of nozzle designs depending on the specific formulation and the intended coat weight of nanofibers on the substrate S. Where desired, theapplicator head 18 can atomize the formulation through pressure generated from thepump 14 at the outlet side of thetank 12. Exemplary of such applicators are those described in Budai, U.S. patent application Ser. No. 13/547,685, which application is commonly assigned with the present application and is incorporated herein by reference in its entirety. - The
system 10 is controlled by thecontroller 20. Thecontroller 20 can, for example, monitor the line speed of the substrate S and vary the nanofiber formulation output flow based on the line speed of the substrate S, the density at which the nanofiber formulation is applied to substrate S (coating weight), thepump 14 outputs and inputs, and like process parameters. Thecontroller 20 can also monitor and control theagitator 24, process temperatures and the like. It is anticipated that thecontroller 20 will be of a menu driven type. - The
present system 10 is configured to apply nanofiber to a wide variety of substrates S. Exemplary nanofiber is that formulated from cellulose acetate, polypropylene, polyethylene, polyester, nylon, polyphthalamide (PPA), polymethyl methacrylate (PMMA), polyactic acid, poly aniline, poly vinyl alcohol, poly acrylonitrile and the like. Other suitable polymers will be appreciated by those skilled in the art. The polymer can be carried in a wide variety of suitable liquid carriers C, such as water. Other additives may be used to create a desired viscosity or nanofiber suspension, including for example, surfactants such as glycerin. - A method of applying nanofibers to a substrate S includes providing a substrate and a
system 10 for applying the nanofiber solution to the substrate and moving the substrate S andsystem 10 relative to one another. It is anticipated that the substrate S will move relative to theapplicator head 18. The method further includes conveying, from a storage vessel such as atank 12, a liquid formulation of nanofibers N in suspension, through one ormore fluid conduits 16, to theapplicator head 18. - The fluid flow is carefully controlled and monitored. As such the flow can be measured, as by one or
more flow meters 30 or like device, at thetank 12 outlet (e.g., the pumped fluid) and the flow rate monitored to ensure that a desired flow rate is maintained. To assure that the formulation in thetank 12 is maintained (e.g., the concentration of nanofibers in the solution), the carrier C inlet to thetank 12 can also be monitored. - In a preferred method, the liquid formulation of nanofibers in suspension is transported through a system that reduces the number of bends or other interferences in flow. The method further includes applying the formulation to a substrate through an
applicator head 18 such as that described above. The nanofiber formulation will be applied at a predetermined coat weight and may depend upon the specific formulation used and the intended use of the resultant coated substrate. It is anticipated that the formulation may be applied by spray, atomization (effected by pump pressure) or like methods. - It will be appreciated that the
present system 10 and method can greatly reduce the energy requirements for applying nanofibers N to substrates S. It is expected that the overall cost of nanofiber production can be reduced by as much as fifty percent with production yields being twenty times greater than known methods such as electrospinning The present process can be carried out at or about room temperature, thus greatly reducing the energy costs over known systems and methods. In addition, functional composites can be made by selectively incorporating materials such as silica, clay, silver particles, titanium and aluminum-based materials and the like. - Using the present system and method, nanofibers can be produced for use in the medical, energy, filtration and lighting industries, as well as for use in general textiles.
- It should also be understood that various changes and modifications to the presently disclosed embodiments will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present disclosure and without diminishing its intended advantages. It is therefore intended that such changes and modifications be covered by the appended claims.
Claims (14)
1. A system for the application of nanofibers to a substrate, comprising:
a tank having an outlet;
an agitator disposed in the tank;
a pump located at the tank outlet;
an applicator disposed proximate to the substrate; and
one or more fluid conduits extending from the tank to the pump and from the pump to the applicator, the fluid conduits configured so as to minimize bends and interferences; and
a controller,
wherein a nanofiber formulation in a fluid carrier in the tank is pumped from the tank to the applicator for application to the substrate at a predetermined flow rate, the pump being controlled by the controller to vary the output of the pump to match the predetermined flow rate, and wherein the nanofiber formulation is applied by the applicator head at a predetermined coat weight on the substrate.
2. The system of claim 1 including one or more flow monitors to monitor the flow of the fluid carrier into the tank and/or the flow of the nanofiber formulation from the tank and/or the flow of nanofiber formulation at a discharge of the pump.
3. The system of claim 1 wherein the agitator is a variable speed agitator and wherein the controller controls the speed of the pump.
4. The system of claim 1 wherein the applicator includes one or more nozzles for application of the nanofiber formulation to the substrate.
5. The system of claim 4 wherein the nozzles are configured to spray the nanofiber formulation onto the substrate.
6. The system of claim 4 wherein the nozzles are configured to atomize the nanofiber formulation for application to the substrate.
7. The system of claim 1 including a conveyor for moving the substrate relative to the applicator.
8. The system of claim 7 wherein the controller controls movement of the conveyor.
9. A method for the application of nanofiber to a substrate comprising the steps of:
providing nanofiber in a carrier to form a nanofiber formulation, the nanofiber formulation stored in a storage tank;
agitating the nanofiber formulation in the storage tank;
pumping the nanofiber formulation from the storage tank to an applicator; and
discharging the nanofiber formulation from the applicator onto the substrate at a desired rate.
10. The method of claim 10 including the step of controlling a rate of discharge from the pump to the applicator.
11. The method of claim 9 wherein the nanofiber formulation is discharged as a spray onto the substrate.
12. The method of claim 9 wherein the nanofiber formulation is atomized for application onto the substrate.
13. The method of claim 9 including the step of conveying a substrate past the applicator, and controlling a speed of conveyance of the substrate.
14. The method of claim 13 including the step of controlling a rate of discharge from the pump to the applicator.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/968,736 US20140134346A1 (en) | 2012-11-09 | 2013-08-16 | System and method for application of nano staple |
EP13788854.1A EP2916966A1 (en) | 2012-11-09 | 2013-10-25 | System and method for application of nanofibres to a substrate |
JP2015541799A JP2016504177A (en) | 2012-11-09 | 2013-10-25 | System and method for applying nanofibers to a substrate |
PCT/US2013/066851 WO2014074328A1 (en) | 2012-11-09 | 2013-10-25 | System and method for application of nanofibres to a substrate |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261724717P | 2012-11-09 | 2012-11-09 | |
US13/968,736 US20140134346A1 (en) | 2012-11-09 | 2013-08-16 | System and method for application of nano staple |
Publications (1)
Publication Number | Publication Date |
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US20140134346A1 true US20140134346A1 (en) | 2014-05-15 |
Family
ID=50681951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/968,736 Abandoned US20140134346A1 (en) | 2012-11-09 | 2013-08-16 | System and method for application of nano staple |
Country Status (4)
Country | Link |
---|---|
US (1) | US20140134346A1 (en) |
EP (1) | EP2916966A1 (en) |
JP (1) | JP2016504177A (en) |
WO (1) | WO2014074328A1 (en) |
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CN110976147A (en) * | 2019-12-23 | 2020-04-10 | 山东鲁阳浩特高技术纤维有限公司 | Hydrophobic agent introducing device and method for preparing nano heat-insulating felt |
CN111036445A (en) * | 2019-12-20 | 2020-04-21 | 周志利 | Toy spraying device |
CN112403773A (en) * | 2020-11-06 | 2021-02-26 | 苏州立科工业设计有限公司 | Surface rust-proof treatment equipment for metal shell of wind power generation equipment |
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CN109414718A (en) * | 2016-07-11 | 2019-03-01 | 东芝三菱电机产业***株式会社 | Droplet coating film forming device and droplet coating film forming method |
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- 2013-10-25 EP EP13788854.1A patent/EP2916966A1/en not_active Withdrawn
- 2013-10-25 JP JP2015541799A patent/JP2016504177A/en active Pending
- 2013-10-25 WO PCT/US2013/066851 patent/WO2014074328A1/en active Application Filing
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Also Published As
Publication number | Publication date |
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EP2916966A1 (en) | 2015-09-16 |
WO2014074328A1 (en) | 2014-05-15 |
JP2016504177A (en) | 2016-02-12 |
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