CN112030370B - Device and method for simultaneously preparing multiple high-uniformity nanofiber membranes - Google Patents
Device and method for simultaneously preparing multiple high-uniformity nanofiber membranes Download PDFInfo
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- CN112030370B CN112030370B CN202010928109.7A CN202010928109A CN112030370B CN 112030370 B CN112030370 B CN 112030370B CN 202010928109 A CN202010928109 A CN 202010928109A CN 112030370 B CN112030370 B CN 112030370B
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
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Abstract
The invention belongs to the field of nano fibers, and relates to a device and a method for simultaneously preparing multiple high-uniformity nano fiber membranes. The device adopts the curved surface fiber forming plate, increases the contact area, simultaneously leads the simultaneously discharged fibers to simultaneously fall on the curved surface fiber forming plate, and greatly increases the uniformity of the fiber film; according to the preparation requirement, a plurality of fiber membranes with the same or different thicknesses are obtained by controlling the diameter of the liquid supply needle tube, so that the membrane thickness error caused by different spinning amounts in unit time before and after the liquid supply needle tube can be effectively avoided, the generated membrane thickness is strictly proportional to the sectional area of the liquid supply needle tube, and great help is provided for researching the membrane thickness property.
Description
Technical Field
The invention belongs to the field of nano fibers, and relates to a device and a method for simultaneously preparing multiple high-uniformity nano fiber membranes.
Background
At present, one method for manufacturing the nanofiber membrane is to introduce PVA polyvinyl alcohol into a high-voltage electric field for spinning, and the nano spinning fibers fall on a planar fiber forming plate to form the nanofiber membrane. In this method, the thickness of the formed nanofiber film is not uniform due to the different distances between each point on the plane and the spinning device, and the uniformity of the nanofiber film cannot be compensated and adjusted in the spinning process.
In addition, only one fiber membrane can be generated after the parameters are adjusted, and the efficiency is low. In the prior art, the film thickness is controlled by controlling the time, the pressure in the liquid supply needle tube is changed in the spinning process, and the spinning amount in unit time before and after the liquid supply needle tube is slightly different, so that the fiber films with the same thickness cannot be prepared.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for simultaneously preparing a plurality of nanofiber membranes with high uniformity. The device adopts the curved surface fiber forming plate, increases the contact area, simultaneously leads the simultaneously discharged fibers to simultaneously fall on the curved surface fiber forming plate, and greatly increases the uniformity of the fiber film; according to the preparation requirement, a plurality of fiber membranes with the same or different thicknesses are obtained by controlling the diameter of the liquid supply needle tube, so that the membrane thickness error caused by different spinning amounts in unit time before and after the liquid supply needle tube can be effectively avoided, the generated membrane thickness is strictly proportional to the sectional area of the liquid supply needle tube, and great help is provided for researching the membrane thickness property.
The technical scheme of the invention is as follows:
a device for simultaneously preparing a plurality of high-uniformity nanofiber membranes mainly comprises a power supply 1, a spinning device 3, an arm beam 4, a liquid supply device 6, a curved surface fiber forming plate 7, a curved surface angle and height adjusting device 8 and a lower polar plate 9.
The bottom of the curved surface fiber forming plate 7 is arranged on a curved surface angle and height adjusting device 8, and the curved surface angle and height adjusting device and the curved surface fiber forming plate are connected through a spherical hinge, so that the angle adjustment of the curved surface fiber forming plate 7 is realized; the bottom of the curved surface angle and height adjusting device 8 is arranged on the lower pole plate 9 in a threaded mode, and the height of the curved surface fiber forming plate 7 is adjusted by adjusting the screwing length of the curved surface angle and height adjusting device 8; the curved surface fiber forming plates 7 are arranged on the lower polar plate 9 side by side;
a plurality of arm beams 4 are arranged on the lower pole plate 9, each arm beam 4 is provided with a laying device 3, the laying devices 3 are positioned above the curved surface fiber forming plates 7, and each curved surface fiber forming plate 7 corresponds to one laying device 3;
the anode and the cathode of the power supply 1 are respectively connected with the beam arm 4 and the curved surface fiber forming plate 7 through leads, so that an electric field exists between the beam arm 4 and the lower polar plate 9;
the liquid supply device 6 is internally provided with a plurality of liquid supply needle tubes which are arranged side by side, if the nanofiber membranes with the same thickness are required to be prepared, the sectional areas of the liquid supply needle tubes are set to be the same, and if the nanofiber membranes with different thicknesses are required to be prepared, the sectional area of each liquid supply needle tube is determined according to the thickness proportion relation of the nanofiber membranes; the liquid supply needle tube is connected with the spinning device 3 through the hose 5, the nanometer liquid enters the electric field through the hose 5 to be spun, and finally a uniform film is formed on the curved surface fiber forming plate 7.
The curved fiber forming plate 7 is obtained by curve rotation, and the curved surface shape is determined as follows:
regarding the falling speed of the fiber, the horizontal speed is set as v0cos θ, time at which the spun fibers first contact the curved fiber forming plate 7T, g is the acceleration of gravity, h is the distance from the lowest point of the curved fiber forming plate 7 to the spinning device,
theta is the angle between the spinning direction of the fiber and the x-axis direction, and theta is taken as theta1，θ2，θ3，θ4……θn(ii) a Let (x)θ，yθ) Is the position of each fiber at time t, then, xθ＝h-v0cosθt，
To obtain theta1～θnCorresponding each fitting point (x)1，y1),(x2，y2),(x3，y3),(x4，y4)……(xn，yn) (ii) a The curve formula is determined by fitting points as follows:
wherein
And rotating the curve to obtain the curved surface shape of the curved surface fiber forming plate 7.
A method for simultaneously preparing a plurality of nanofiber membranes with high uniformity comprises the following steps of:
the liquid supply needle tube is driven by the liquid supply device 6, so that the nano liquid in the liquid supply needle tube is pressurized and enters the laying device 3 along the hose 5, and the laying device 3 carries out laying in an electric field; the positive pole of the power supply 1 is connected with the arm beam 4, the negative pole of the power supply 1 is connected with the curved surface fiber forming plate 7, the formed electric field is high-voltage low-current, and the electric field exists between the arm beam 4 and the curved surface fiber forming plate 7; under the action of the electric field force, the nanometer liquid enters the electric field to spit filaments, and the spitted filaments fall on the curved surface fiber forming plate 7 to form a fiber film; meanwhile, the angle and the height of the curved fiber forming plate 7 can be adjusted before or during the spinning process to improve the uniformity of the fiber film.
The invention has the beneficial effects that:
(1) the curved fiber forming plate enables the formed nanofiber membrane to be more uniform.
(2) Because the curved surface can limit the spinning range, a lot of spinning is blocked by the curved surface wall, so that all spinning falls into the curved surface, and the defect that the flat fiber forming plate can not limit the spinning range is eliminated; save nano-materials, can guarantee that all nanofiber all fall in the curved surface for the actual volume of device reduces.
(3) The bottom of the curved surface fiber forming plate is spirally connected with the lower pole plate, so that the distance from the curved surface fiber forming plate to the spinning device can be adjusted, and the distance can be adjusted according to the external environment.
(4) The angle of the curved surface fiber forming plate can be freely adjusted, and the angle of the curved surface can be adjusted at any time in the fiber preparation process.
(5) The fiber film forming device has the advantages that the fiber film forming device is provided with the plurality of curved surface fiber forming plates, a plurality of fiber films can be produced at the same time, the thickness of the produced fiber films is strictly proportional to the sectional area of the liquid supply needle tube, the sectional area of the liquid supply needle tube is a single variable influencing the relative thickness of the produced fiber films, and the fiber film forming device has good experimental performance.
Drawings
FIG. 1 is an exploded view of the motion vectors as the fiber falls;
FIG. 2 is a curved generatrix fit of a curved fiber forming plate;
FIG. 3 is an assembly view of the curved fiber forming plate with the curved angle and height adjustment means;
FIG. 4 is a schematic view of the apparatus of the present invention (only one curved fiber forming plate is shown);
FIG. 5 is a fluid supply assembly of the present invention including a plurality of fluid supply syringes;
fig. 6 is an apparatus for simultaneously processing four nanofiber membranes with different thickness and high uniformity.
In the figure: 1, a power supply; 2, conducting wires; 3 a spinning device; 4, a beam of arms; 5, a hose; 6 a liquid supply device; 7, forming a curved surface fiber forming plate; 8, a curved surface angle and height adjusting device; and 9, a lower polar plate.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
As shown in fig. 4 and fig. 6, the apparatus for simultaneously preparing a plurality of nanofiber membranes with high uniformity of the present invention mainly comprises a power supply 1, a conducting wire 2, a laying device 3, an arm beam 4, a hose 5, a liquid supply device 6, a curved fiber forming plate 7, a curved angle and height adjusting device 8 and a bottom plate 9.
The hose 5 is connected with a liquid supply device 6, and the nano liquid enters the electric field along the hose 5 through the liquid supply device 6. The electric field exists between the beam arm 4 connected with the positive pole of the power supply and the curved fiber forming plate 7 connected with the negative pole of the power supply 1. The curved surface fiber forming plate 7 is connected with the curved surface angle and height adjusting device 8 through a ball hinge and can rotate within a certain range; a layer of rubber can be arranged between the curved surface fiber forming plate and the curved surface fiber forming plate to enhance compactness, so that the curved surface fiber forming plate can rotate only when the force reaches a certain value, and the angle of the curved surface fiber forming plate 7 can be adjusted through a curved surface angle and height adjusting device 8; the surface angle and height adjusting device 8 is in threaded connection with the lower pole plate 9, the curved surface fiber forming plate 7 can adjust the height through the surface angle and height adjusting device 8, and the selection of the height is related to the material for specifically preparing the fibers, the electric field intensity and the pressure intensity. The nanometer liquid enters an electric field for spinning, and a uniform nanometer fiber film is formed on the curved surface fiber forming plate 7.
The assembly of the curved fiber forming plate with the curved angle and height adjustment device is shown in FIG. 3, and the liquid supply device with a plurality of liquid supply needle tubes is shown in FIG. 5.
FIG. 6 is a schematic view of an apparatus for simultaneously producing four fiber membranes with different thicknesses, in which a plurality of sets of liquid supply needle tubes and corresponding curved fiber forming plates 7 can be arranged according to the situation in practical application; if the nanofiber membranes with the same thickness need to be prepared, the cross-sectional areas of the multiple liquid supply needle tubes are set to be the same, and if the nanofiber membranes with different thicknesses need to be prepared, the cross-sectional areas of the liquid supply needle tubes are determined according to the thickness proportion relation of the nanofiber membranes. The fiber forming plate 7 with a plurality of curved surfaces can simultaneously produce a plurality of fiber membranes, the thickness of the produced fiber membranes is proportional to the sectional area of the liquid supply needle tube, the sectional area of the liquid supply needle tube is controlled to be a single variable, and the fiber forming plate has good experimental performance.
Determination of the curved surface shape of the curved surface fiber forming plate 7 (five points in this example are taken for curve fitting):
the falling speed of the fiber is different in all directions, as shown in FIG. 1, and the initial falling speed v of the fiber is set as0Velocity in the horizontal direction is v0cos theta, the time that the spun fiber firstly contacts the curved fiber forming plate 7 is t, the gravity acceleration is g, h is the distance from the lowest point of the curved fiber forming plate 7 to the spinning device,
let theta be the angle between the spinning direction of the fiber and the x-axis direction, and take theta equal to theta1，θ2，θ3，θ4，θ5Is, is (x)θ，yθ) Is the position of each fiber at time t, then, xθ＝h-v0cosθt，
So that theta can be obtained1～θnCorresponding each fitting point (x)1，y1),(x2，y2),(x3，y3),(x4，y4),(x5，y5)。
As shown in fig. 2, each point is marked in the figure, and the curved surface structure of the curved surface fiber forming plate 7 is finally formed by fitting a bezier curve and rotating, and the curve formula is as follows:
wherein
n＝4。
Claims (2)
1. The device for simultaneously preparing a plurality of high-uniformity nanofiber membranes is characterized by mainly comprising a power supply (1), a spinning device (3), an arm beam (4), a liquid supply device (6), a curved surface fiber forming plate (7), a curved surface angle and height adjusting device (8) and a lower polar plate (9);
the bottom of the curved surface fiber forming plate (7) is arranged on the curved surface angle and height adjusting device (8), and the curved surface angle and height adjusting device and the curved surface fiber forming plate are connected through a spherical hinge to realize angle adjustment of the curved surface fiber forming plate (7); the bottom of the curved surface angle and height adjusting device (8) is arranged on the lower pole plate (9) in a threaded mode, and the height of the curved surface fiber forming plate (7) is adjusted by adjusting the screwing length of the curved surface angle and height adjusting device (8); the curved surface fiber forming plates (7) are arranged on the lower polar plate (9) side by side;
a plurality of arm beams (4) are arranged on the lower pole plate (9), each arm beam (4) is provided with a laying device (3), the laying devices (3) are positioned above the curved surface fiber forming plates (7), and each curved surface fiber forming plate (7) corresponds to one laying device (3);
the positive pole and the negative pole of the power supply (1) are respectively connected with the arm beam (4) and the curved surface fiber forming plate (7) through leads, so that an electric field exists between the arm beam (4) and the lower polar plate (9);
the liquid supply device (6) is internally provided with a plurality of liquid supply needle tubes which are arranged side by side, if the nanofiber membranes with the same thickness are required to be prepared, the sectional areas of the liquid supply needle tubes are set to be the same, and if the nanofiber membranes with different thicknesses are required to be prepared, the sectional area of each liquid supply needle tube is determined according to the thickness proportion relation of the nanofiber membranes; the liquid supply needle tube is connected with the spinning device (3) through the hose (5), the nanometer liquid enters the electric field through the hose (5) to be spun, and finally a uniform film is formed on the curved surface fiber forming plate (7).
2. A method for simultaneously preparing a plurality of nanofiber membranes with high uniformity, which adopts the device of claim 1, and comprises the following specific steps:
the liquid supply needle tube is driven by the liquid supply device (6), so that the nano liquid in the liquid supply needle tube is pressurized and enters the spinning device (3) along the hose (5), and the spinning device (3) performs spinning in an electric field; the positive pole of the power supply (1) is connected with the arm beam (4), the negative pole of the power supply (1) is connected with the curved surface fiber forming plate (7), the formed electric field is high-voltage low-current, and the electric field exists between the arm beam (4) and the curved surface fiber forming plate (7); under the action of the electric field force, the nanometer liquid enters the electric field to spit filaments, and the spitted filaments fall on a curved surface fiber forming plate (7) to form a fiber film; meanwhile, the angle and the height of the curved fiber forming plate (7) can be adjusted before or during the spinning process to improve the uniformity of the fiber film.
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| KR101061081B1 (en) * | 2004-09-17 | 2011-08-31 | 니혼바이린 가부시기가이샤 | Manufacturing method of fiber aggregate and apparatus for manufacturing fiber aggregate |
| CN101487172B (en) * | 2009-02-19 | 2010-10-20 | 浙江大学 | Multi-nozzle and spherical surface film-forming electrostatic spinning film production apparatus for hollow circular ring pipe |
| KR101326506B1 (en) * | 2012-04-30 | 2013-11-08 | 현대자동차주식회사 | Manufacturing method of melt-blown fabric web having random and bulky caricteristics and manufacuring apparatus thereof |
| CN203395521U (en) * | 2013-07-18 | 2014-01-15 | 深圳市蔚乐电子有限公司 | Magnetic universal support |
| US9994975B2 (en) * | 2014-06-27 | 2018-06-12 | Deepthy Menon | Electrospinning apparatus and method for producing multi-dimensional structures and core-sheath yarns |
| CN106917147A (en) * | 2017-01-22 | 2017-07-04 | 广东工业大学 | A kind of electrostatic spinning apparatus |
| CN108385282B (en) * | 2018-03-05 | 2020-03-06 | 厦门理工学院 | Preparation method of three-dimensional fiber membrane |
| CN109778324B (en) * | 2019-01-25 | 2023-09-15 | 青岛科技大学 | Spherical free interface melt electrostatic spinning device |
| CN110257927B (en) * | 2019-05-30 | 2021-11-19 | 北京百年初心科技有限公司 | Electrostatic spinning machine is used in nanofiber production |
| CN110735191B (en) * | 2019-10-30 | 2020-11-03 | 大连理工大学 | Device and method for preparing suspended nano-fiber net with ultra-large area |
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