CN114411336B - Method and device for producing in-situ electret fiber membrane - Google Patents
Method and device for producing in-situ electret fiber membrane Download PDFInfo
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- CN114411336B CN114411336B CN202111647817.4A CN202111647817A CN114411336B CN 114411336 B CN114411336 B CN 114411336B CN 202111647817 A CN202111647817 A CN 202111647817A CN 114411336 B CN114411336 B CN 114411336B
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- spinneret
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- melt
- polypropylene
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- 239000000835 fiber Substances 0.000 title claims abstract description 61
- 239000012528 membrane Substances 0.000 title claims abstract description 38
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004743 Polypropylene Substances 0.000 claims abstract description 45
- -1 polypropylene Polymers 0.000 claims abstract description 45
- 229920001155 polypropylene Polymers 0.000 claims abstract description 45
- 230000005686 electrostatic field Effects 0.000 claims abstract description 32
- 239000000155 melt Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 239000007921 spray Substances 0.000 claims abstract description 5
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 239000000289 melt material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 abstract description 7
- 238000002074 melt spinning Methods 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 10
- 230000005684 electric field Effects 0.000 description 9
- 238000001914 filtration Methods 0.000 description 8
- 238000009987 spinning Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011236 particulate material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000004750 melt-blown nonwoven Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
-
- 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
- D01D4/00—Spinnerette packs; Cleaning thereof
- D01D4/02—Spinnerettes
- D01D4/025—Melt-blowing or solution-blowing dies
-
- 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
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
-
- 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
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
Abstract
The invention discloses a production method and a production device of an in-situ electret fiber membrane, wherein polypropylene melt is ejected from a spinneret orifice pneumatically to form melt filaments; the melt filaments pass through a high-voltage electrostatic field and are collected into a polypropylene non-woven fabric fiber membrane. When melt of polypropylene and other polarizable materials enters the electrostatic field through the spinneret holes to be polarized, as the charges of polymer molecular chains in the melt are the same, melt jet flow is continuously split when moving in a polarization space, and finally, the fibers with the diameters much smaller than that of the spinneret holes can be obtained when the fibers reach the collection, so that the spinneret holes with the very small apertures are not needed; meanwhile, polarization is completed in the melt spinning process, so that secondary polarization is not needed; the invention not only reduces the requirement on the spinneret plate, but also greatly reduces the blocking phenomenon of the spray holes in the production process due to the increase of the aperture of the spinneret holes, and simultaneously simplifies the process steps.
Description
Technical Field
The invention relates to a fiber membrane production method, in particular to a production method and a production device of an in-situ electret fiber membrane.
Background
Air filtration mainly utilizes sieving action for the trapping of particulate matter larger than the filter material pore size, and internal filtration and surface filtration mainly for the trapping of smaller particulate matter. The internal/surface filtration of small particles is achieved with a variety of effects including interception effects, inertial effects, diffusion effects, gravitational effects, and electrostatic effects. Particles with the particle diameter below 0.5 μm are mainly adsorbed and deposited on the surface of the fiber through the electrostatic effect of the filter material and the combination diffusion. The polypropylene melt-blown nonwoven fabric is composed of ultrafine fibers with diameters of 2-5 mu m, and the fibers are distributed in an unordered manner to form a large number of tiny gaps. After electret treatment, the fibers have a large amount of charges, a large amount of electrodes are formed among the fibers, the interelectrode field strength can reach more than ten MV/m, and the equivalent surface charge density can even reach 90Nc/cm 2 . Under the action of static electricity, a large amount of small-particle-size particles are adsorbed and captured by the fibers, and meanwhile, a polarizable part is not charged with the particles and is adsorbed. The medical protective mask using the electret treatment filter material finally integrates various trapping effects to achieve the particulate matter filtering efficiency required by the GB 19083-2010 standard.
However, the filtering effect of the filter material, particularly, the filtering effect of small-sized particles is greatly affected by the properties of the filter material and the use environment, such as the filtering speed, the fiber filling rate, the fiber diameter, the surface and space charges, the dust holding capacity, the air flow temperature and humidity, the physical and chemical properties of the particles, and the like.
The existing preparation technology of the electret fiber membrane mainly comprises the steps of preparing a superfine fiber membrane by taking polypropylene as a raw material through a melt-blowing process, and then carrying out electret on the fiber membrane by utilizing a high-voltage electric field; the charge density, surface potential, charge decay and the like of the prepared electret polypropylene film are mainly related to the electret voltage, time and the properties of the material. The existing technological process can finish the electret after the melt-blown molding is processed for a certain time by a high-voltage electric field, and the technological process is complex; meanwhile, in order to obtain a smaller fiber diameter, the aperture of the melt-blowing spinneret plate is extremely fine, so that the processing cost is high, and the service life is shorter.
Disclosure of Invention
The invention aims to provide a production method of an in-situ electret fiber membrane with low product cost; the invention also provides a production device of the in-situ electret fiber membrane.
In order to solve the technical problems, the invention adopts the following technical scheme: jetting polypropylene melt material from the spinneret orifice pneumatically to form melt filaments; the melt filaments pass through a high-voltage electrostatic field and are collected into a polypropylene non-woven fabric fiber membrane.
The high-voltage electrostatic field is 8-25 kV.
The diameter of the spinneret orifice (35) is 0.6-1.2 mm.
The device comprises a polypropylene melting and feeding assembly, a electret spinneret plate assembly, a compressed gas assembly, a fibrous membrane collecting assembly and a high-voltage electrostatic field assembly; the polypropylene melting feeding component is communicated with the electret spinneret plate component and supplies materials for the electret spinneret plate component; the electret spinneret plate assembly is opposite to the fiber membrane collecting assembly and sprays melt filaments to the fiber membrane collecting assembly; the compressed gas assembly provides compressed air to the electret spinneret assembly; the high-voltage electrostatic field assembly comprises an electrostatic generator, a high-voltage negative electrode binding post and a high-voltage positive electrode binding post; the high-voltage positive electrode binding post is positioned at the position of the electret spinneret plate assembly, and the high-voltage negative electrode binding post is positioned at the position of the fiber membrane collecting assembly; the electret spinneret plate assembly comprises a spinneret plate and a spinneret plate, and spinneret orifices are formed in the spinneret plate.
The front end of the spinneret is opposite to the spinneret plate, and the rear end of the spinneret is communicated with a polypropylene melting and feeding assembly; the rear side part of the spinneret plate is communicated with the compressed gas assembly and communicated with the spinneret hole through a compressed gas passage.
The diameter of the spinneret orifice of the device is 0.6-1.2 mm.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: according to the invention, an electrostatic field with a certain intensity is established between spinning and collection, when melt of a polarizable material such as polypropylene enters the electrostatic field through a spinning hole to be polarized, as the charges of polymer molecular chains in the melt are the same, melt jet flow can be continuously split when moving in a polarization space, and finally, the fiber with a diameter much smaller than that of the spinning hole can be obtained when the fiber reaches the collection, so that the spinning hole with a very small aperture is not needed. Meanwhile, polarization is finished in the melt spinning process, so that secondary polarization is not needed. Therefore, the invention not only reduces the requirement on the spinneret plate, but also greatly reduces the blocking phenomenon of the spray holes in the production process due to the increase of the aperture of the spinneret holes, simplifies the process steps and can accelerate the production.
The device of the invention is assisted by introducing a high-voltage electrostatic field into the melt spinning forming process, and on the premise of preparing the non-woven film with the same fiber diameter, the diameter of the spinning hole of the spinneret plate can be increased by 1-4 times compared with the prior art, the requirement on the processing precision of the spinneret plate is obviously reduced, the spinning process is simplified, the loss of the melt spinning spinneret plate is reduced, the production cost is obviously reduced, and the service life of the product is obviously prolonged.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic view of the structure of the device of the present invention;
FIG. 2 is a schematic view of the structure of a polypropylene melt feed assembly of the apparatus of the present invention;
FIG. 3 is a schematic view of the structure of the electret spinneret assembly of the apparatus of the present invention;
FIG. 4 is a schematic view of the structure of the fiber membrane collecting assembly of the device of the present invention.
In the figure: a polypropylene melt feed assembly 1; a feed drive motor 11; a feed bin 12; a heating device 13; a feeder shell 14; a melting outlet 15; a screw 16; a compressed gas assembly 2; a gas tank 21; a gas pipe 22; a electret spinneret plate assembly 3; a melt connection pipe 31; a gas connection pipe 32; a compressed gas passage 33; a spinneret plate 34; a spinneret hole 35; a spinneret 36; a fibrous membrane collection assembly 4; a collection roller 41; a timing belt 42; a collection drive motor 43; a drive belt 44; a drive wheel 45; a first driven wheel 46; a collection belt 47; a second driven wheel 48; a high voltage electrostatic field assembly 5; an electrostatic generator 51; a high voltage positive terminal 52; a high voltage negative terminal 53; and a control assembly 6.
Detailed Description
Examples 1 to 4: the production method of the in-situ electret fiber membrane adopts the following specific process.
(1) Pneumatically ejecting the polypropylene melt from the spinneret orifice of the spinneret plate to form melt filaments; the ejected melt filaments enter a high-voltage electrostatic field and pass through the high-voltage electrostatic field along the direction from the positive electrode to the negative electrode of the high-voltage electrostatic field; the melt filaments after passing through the high voltage electrostatic field are collected as a polypropylene nonwoven fibrous membrane. The high-voltage electrostatic field is 8-25 kV; the diameter of the spinneret hole is 0.6-1.2 mm, which is far larger than the diameter of the spinneret hole in the conventional equipment, namely 0.1-0.3 mm. The melt filaments are continually split and polarized in a high voltage electrostatic field to yield fibers having a much smaller diameter than the spinneret orifice. The specific process parameters of each example, as well as the average diameter of the fibers in the resulting fibrous membranes, are shown in table 1.
(2) To demonstrate the effectiveness of the present process, a comparison was made using a conventional spinning method without a high voltage electrostatic field, the process parameters of the comparative example, and the average diameter of the fibers in the resulting fibrous film are shown in Table 1.
Table 1: comparison table of the present method and conventional method
| Diameter of spinneret hole | High voltage electrostatic field | Average diameter of fiber | |
| Example 1 | 0.6mm | 25 | 0.1 |
| Example 2 | 0.8mm | 15 | 0.2 |
| Example 3 | 1.0mm | 20 | 0.2 |
| Example 4 | 1.2mm | 8 | 0.3 |
| Comparative example 1 | 0.1mm | / | 0.1 |
| Comparative example 2 | 0.2mm | / | 0.2 |
| Comparative example 3 | 0.3mm | / | 0.3 |
As can be seen from Table 1, the melt filaments ejected from the orifices of 0.6-1.2 mm in diameter in the present method were collected to give fiber films having an average fiber diameter substantially the same as that of the fiber films obtained from the orifices of 0.1-0.3 mm in conventional equipment.
The in-situ electret fiber membrane production device shown in fig. 1 comprises a polypropylene melting and feeding assembly 1, an electret spinneret plate assembly 3, a compressed gas assembly 2, a fiber membrane collecting assembly 4 and a high-voltage electrostatic field assembly 5. The polypropylene melt feed assembly 1 communicates with a electret spinneret assembly 3 and feeds polypropylene melt to the electret spinneret assembly 3. The compressed gas assembly 2 provides compressed air to a electret spinneret assembly 3. The electret spinneret plate assembly 3 stretches polypropylene melt materials into melt filaments under the driving of air flow of compressed air, and the melt filaments are sprayed forwards. The fiber film collecting assembly 4 is positioned in front of the electret spinneret assembly 3 and is opposite to the electret spinneret assembly 3 and is used for collecting melt filaments into an in-situ electret fiber film. The high-voltage electrostatic field assembly 5 sets a high-voltage electrostatic field between the electret spinneret plate assembly 3 and the fiber membrane collecting assembly 4, and the melt filaments are polarized in the high-voltage electric field simultaneously when being stretched by the air flow; after the melt filaments of polypropylene are polarized, the polypropylene molecular chains have the same polarized charges, the melt filaments are further split in an electric field due to the repulsive force received by the same charges, and finally the in-situ electret fiber membrane with the diameter much smaller than that of the spinneret holes can be obtained when the melt filaments reach the fiber membrane of the fiber membrane collecting assembly 4.
As shown in fig. 1 and 2, the polypropylene melting and feeding assembly of the production device of the in-situ electret fiber film comprises a screw feeder, a feeding bin 12, a feeding driving motor 11 and a heating device 13; the screw feeder comprises a feeder housing 14 and a screw 16 located within the feeder housing 14. The rear part of the feeder tube shell 14 is communicated with the feeding bin 12, and the front end of the feeder tube shell is provided with a melting discharge port 15; the rear end of the screw 16 is connected with a feeding driving motor 11, and is driven by the feeding driving motor 11 to rotate. The outside of the feeder shell 14 is provided with a heating device 13 for heating the polypropylene particle raw material in the screw feeder. After the structure is adopted, the polypropylene particle raw material enters a feeder tube shell 14 of a screw feeder through a feeding bin 12, a screw 16 in the screw feeder rotates under the drive of a feeding driving motor 11, the polypropylene particle raw material continuously moves from the direction of the feeding bin 12 to the direction of a melting discharge hole 15 under the action of the screw 16, and a heating device 13 heats the polypropylene particle raw material as required in the moving process to gradually melt the polypropylene particle raw material; the polypropylene particulate material, which has been subjected to heating and shearing by the screw, has reached a melt state in which it can be spun as it is conveyed to the melt outlet 15.
As shown in fig. 1, the compressed gas assembly 2 of the production device of the in-situ electret fiber membrane comprises a gas storage tank 21 and a gas pipe 22; the air storage tank 21 is communicated with the electret spinneret plate assembly 3 through an air pipe 22. The compressed gas assembly 2 may also be provided with a compressor, which supplies the gas reservoir 21.
As shown in fig. 1 and 3, the in-situ resident-pole fiber film production device comprises a resident-pole spinneret plate assembly 3, which comprises a spinneret 34 and a spinneret 36. The front end of the spinneret 36 is opposite to the spinneret 34, and the rear end of the spinneret 36 is communicated with a melting discharge port 15 of a screw feeder in the polypropylene melting feed assembly 1 through a melt connecting pipe 31; the spinneret plate 34 is provided with spinneret orifices 35, and the rear side part of the spinneret plate 34 is communicated with the gas transmission pipe 22 of the compressed gas assembly 2 through a gas connecting pipe 32; a compressed gas circuit 33 is arranged in the spinneret plate 34, one end of the compressed gas circuit 33 is communicated with the gas pipe 22, and the other end is communicated with the spinneret hole 35; the compressed gas input by the compressed gas assembly 2 is sprayed forward from the spinneret 35 after passing through the compressed gas path 33, and the polypropylene melt fed out from the spinneret 36 is driven in the spraying process, so that the polypropylene melt is stretched into melt filaments under the driving of the air flow, and is sprayed forward to form melt jet. Since the high-voltage electrostatic field assembly 5 sets a high-voltage electrostatic field between the electret spinneret assembly 3 and the fiber film collecting assembly 4, the melt jet is continuously split, so that the diameter of the spinneret orifice 35 is 0.6-1.2 mm, which is far greater than the diameter of the spinneret orifice in conventional equipment, which is 0.1-0.3 mm.
As shown in fig. 1 and 4, the fiber membrane collecting assembly comprises a collecting belt 47, a collecting roller 41, a roller group and a driving device. The roller set comprises a driving wheel 45 and at least two driven wheels, as shown in fig. 4, wherein the number of the driven wheels is two, namely a first driven wheel 46 and a second driven wheel 48; the driving wheel 45 and the first and second driven wheels 46, 48 are thus arranged in a triangle. The collecting belt 47 is sleeved on a roller group formed by the driving wheel 45, the first driven wheel 46 and the second driven wheel 48 and is connected with the roller group belt; wherein either the first driven pulley 46 or the second driven pulley 48 acts to tension the collection belt 47 and adjust the angle of the collection belt 47. The collection belt 47 is positioned at the forward end of the electret spinneret assembly 3 and is opposite the spinneret orifices 35 such that the melt filaments ejected from the spinneret orifices 35 are directed onto the collection belt 47. The collecting roller 41 is located at the front end or the front end side of the collecting belt 47 to wind the fibrous membrane formed on the collecting belt 47. The driving device adopts a collecting driving motor 43, and the collecting driving motor 43 drives a driving wheel 45 to rotate through a driving belt 44. The collecting roller 41 may be driven by a separate motor via the timing belt 42, or may be driven by a collecting drive motor 43 via the timing belt 42. Thus, during rotation of the collection belt 47, the orifices 35 of the electret spinneret assembly 3 constantly spray melt filaments onto the collection belt 47 and solidify on the collection belt 47; as the collecting belt 47 is continuously rotated, a fibrous film is formed on the collecting belt 47; the formed fibrous film is wound around the collecting roller 41 and collected together by the rotation of the collecting roller 41.
As shown in fig. 1, 3 and 4, the high-voltage electrostatic field assembly 5 of the apparatus for producing an in-situ electret fiber film comprises an electrostatic generator 51, a high-voltage negative electrode binding post 53 and a high-voltage positive electrode binding post 52. The high voltage positive terminal 52 is located at the forward end of the spinneret 34 in the electret spinneret assembly 3 and the high voltage negative terminal 53 is located at the rear end of the collection belt 47 in the fiber membrane collection assembly 4. The positive electrode of the electrostatic generator 51 is connected with a high-voltage positive electrode binding post 52 through a wire, and the negative electrode is connected with a high-voltage negative electrode binding post 53 through a wire; thus, a high-voltage electric field of a certain intensity can be formed in the space between the spinneret 34 and the collecting belt 47; the high-voltage electric field is 8-25 kV.
FIG. 1, the present in situ electret fiber film production apparatus may further comprise a control assembly 6; the control assembly can be composed of a power supply system, a communication system and a relay control system and is used for controlling all the components of the device to work and adjusting corresponding technological parameters according to different raw materials.
The use process of the production device of the in-situ electret fiber membrane is as shown in fig. 1-4: (1) The polypropylene particle raw material enters a feeder tube shell 14 of a screw feeder through a feeding bin 12, and a feeding driving motor 11 drives a screw 16 of the screw feeder; the heating device 13 melts the polypropylene particulate material, thereby feeding the polypropylene melt from the melt outlet 15 to the spinneret 36 of the electret spinneret assembly 3;
(2) The polypropylene melt in the spinneret 36 enters the spinneret orifice 35 of the spinneret 34 forwards, is sprayed forwards to form melt jet under the driving of the air flow of compressed air, and is stretched to form melt filaments under the driving of the air flow;
(3) Under the action of a high-voltage electric field of 8-25 kV, which is applied between the spinneret 34 and the collecting belt 47 by the high-voltage electrostatic field assembly 5, the melt filaments are simultaneously polarized in the high-voltage electric field while being stretched by the air flow; after the polypropylene melt filaments are polarized, the polypropylene molecular chains therein have the same polarized charges, and the melt filaments are further split in an electric field due to the repulsive force received by the same charges;
(4) In the case of polarization and cleavage described above, the melt filaments will eventually reach the collection belt 41 of the collecting fiber film assembly 4 much smaller than the diameter of the spinneret orifice 35; the melt filaments solidify on collection belt 41 into an in-situ electret fibrous film that is collected by collection roll 41.
Claims (2)
1. The production method of the in-situ electret fiber membrane is characterized by comprising the following steps of: jetting polypropylene melt material from the spinneret orifice pneumatically to form melt filaments; the ejected melt filaments enter a high-voltage electrostatic field and pass through the high-voltage electrostatic field along the direction from the positive electrode to the negative electrode of the high-voltage electrostatic field, and the melt filaments are continuously split and polarized in the high-voltage electrostatic field and then collected into a polypropylene non-woven fabric fiber membrane; the high-voltage electrostatic field is 8-25 kV; the diameter of the spinneret orifice (35) is 0.6-1.2 mm;
the production device of the production method comprises the following steps: the device comprises a polypropylene melting feeding component (1), a electret spinneret plate component (3), a compressed gas component (2), a fiber membrane collecting component (4) and a high-voltage electrostatic field component (5); the polypropylene melting feeding assembly (1) is communicated with the electret spinneret plate assembly (3) and is used for feeding the electret spinneret plate assembly (3); the electret spinneret plate assembly (3) is opposite to the fiber membrane collecting assembly (4) and sprays melt filaments to the fiber membrane collecting assembly (4); the compressed gas assembly (2) provides compressed air for the electret spinneret assembly (3); the high-voltage electrostatic field assembly (5) comprises an electrostatic generator (51), a high-voltage negative electrode binding post (53) and a high-voltage positive electrode binding post (52); the high-voltage positive electrode binding post (52) is positioned at the position of the electret spinneret plate assembly (3), and the high-voltage negative electrode binding post (53) is positioned at the position of the fibrous membrane collecting assembly (4); the electret spinneret plate assembly (3) comprises a spinneret plate (34) and a spinneret plate (36), and spinneret holes (35) are formed in the spinneret plate (34);
the polypropylene melting and feeding assembly comprises a screw feeder, a feeding bin (12), a feeding driving motor (11) and a heating device (13); the screw feeder comprises a feeder housing (14), and a screw (16) located within the feeder housing (14); the rear part of the feeder tube shell (14) is communicated with the feeding bin (12), and the front end of the feeder tube shell is provided with a melting discharge port (15); the rear end of the screw (16) is connected with a feeding driving motor (11), and is driven by the feeding driving motor (11) to rotate; the outside of the feeder tube shell (14) is provided with a heating device (13) for heating the polypropylene particle raw material in the spiral feeder.
2. The method of producing an in-situ electret fiber film of claim 1, wherein: the front end of the spinneret (36) is opposite to the spinneret plate (34), and the rear end of the spinneret is communicated with the polypropylene melting and feeding assembly (1); the rear side part of the spinneret plate (34) is communicated with the compressed gas assembly (2) and is communicated with the spinneret hole (35) through a compressed gas passage (33).
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| CN202111647817.4A CN114411336B (en) | 2021-12-30 | 2021-12-30 | Method and device for producing in-situ electret fiber membrane |
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| CN202111647817.4A CN114411336B (en) | 2021-12-30 | 2021-12-30 | Method and device for producing in-situ electret fiber membrane |
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| CN114411336B true CN114411336B (en) | 2023-10-27 |
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