CN117344394A - Melt-blown cloth spinneret air supply device - Google Patents
Melt-blown cloth spinneret air supply device Download PDFInfo
- Publication number
- CN117344394A CN117344394A CN202311327348.7A CN202311327348A CN117344394A CN 117344394 A CN117344394 A CN 117344394A CN 202311327348 A CN202311327348 A CN 202311327348A CN 117344394 A CN117344394 A CN 117344394A
- Authority
- CN
- China
- Prior art keywords
- spinneret
- air
- hot air
- plate
- melt
- 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.)
- Pending
Links
- 239000004744 fabric Substances 0.000 title claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000000155 melt Substances 0.000 claims description 12
- 238000005491 wire drawing Methods 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 abstract description 13
- 238000009987 spinning Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 239000012768 molten material Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- 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
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses a melt-blowing spinneret plate air supply device, which comprises a spinneret assembly and an air supply assembly for supplying air to the spinneret assembly, wherein the spinneret assembly comprises a runner plate for guiding melt to flow, the runner plate is provided with a hot air channel, and the side wall of the runner plate is provided with a plurality of hot air inlets communicated with the hot air channel; the air supply assembly comprises a hot air source and a mixing box used for uniformly mixing the air output by the hot air source, wherein the mixing box is provided with air outlets, the air outlets are in one-to-one correspondence with the hot air inlets, and the air outlets are communicated with the hot air inlets through conveying pipes. The blowing device of the melt-blown fabric spinneret plate is reasonable in structure, the phenomena of high temperature and low middle temperature of the end part of the hot air channel and low air pressure in the middle of the end part of the hot air channel can be avoided, the temperature and the air pressure in the spinneret plate are consistent, the fibers sprayed out of the spinneret plate are consistent, and the yield of the melt-blown fabric is improved.
Description
Technical Field
The invention relates to the technical field of melt-blown cloth production, in particular to an air supply device of a melt-blown cloth spinneret plate.
Background
The melt-blown fabric is a filter material using polypropylene as a main raw material. The fiber diameter can reach 1-5 microns, and the superfine fibers with unique capillary structures increase the number and the surface area of fibers in unit area, so that the melt-blown cloth has good filterability, shielding property, heat insulation property and oil absorption property, and can be used in the fields of air, liquid filter materials, isolating materials, absorbing materials, mask materials, thermal insulation materials, wiping cloth and the like. Meltblown cloth is the most core material of the mask.
When manufacturing the melt-blown fabric, a large amount of hot air is needed, the air heated by the air heater enters the hot air channel of the air supply device of the melt-blown fabric spinneret plate through the air inlet of the die, and in the common preparation process of the melt-blown fabric, the most important part is to blow the melt trickle sprayed from the spinneret plate into very fine fibers by using high-temperature and high-speed hot air flow after obtaining the high-temperature molten state material. After the fibers are collected, they are bonded to each other by their own waste heat to form a meltblown web. In the link, the qualified product can be produced only by the fact that the constant temperature and the constant pressure of hot air flow are in the optimal range (the air pressure is 0.045Mpa, the air temperature is between 200 ℃ and 250 ℃ according to the corresponding requirement of melt-blown cloth), but after the hot air flow is introduced into a hot air channel, the conditions of high end temperature, low middle temperature and low end air pressure and low middle air pressure often occur, so that the temperature and the air pressure in a spinning die head are not up to the standard, the quality of the produced melt-blown cloth is different, and the filtering effect is poor.
Accordingly, there is a need for an improved meltblowing spinneret blower in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an air supply device of a melt-blown fabric spinneret plate, which can avoid the phenomena of high temperature at the end part of a hot air channel, low middle temperature and low air pressure at the end part, ensure the consistency of the temperature and air pressure in the spinneret plate, ensure the consistency of fibers sprayed out of the spinneret plate and improve the yield of the melt-blown fabric.
In order to achieve the technical effects, the technical scheme of the invention is as follows: the melt-blowing spinneret plate air supply device comprises a spinneret assembly and an air supply assembly for supplying air to the spinneret assembly, wherein the spinneret assembly comprises a runner plate for guiding melt to flow, the runner plate is provided with a hot air channel, and the side wall of the runner plate is provided with a plurality of hot air inlets communicated with the hot air channel; the air supply assembly comprises a hot air source and a mixing box used for uniformly mixing the air output by the hot air source, wherein the mixing box is provided with air outlets, the air outlets are in one-to-one correspondence with the hot air inlets, and the air outlets are communicated with the hot air inlets through conveying pipes.
The preferable technical scheme is that the stirrer is arranged in the mixing box, the stirrer is provided with a plurality of stirring holes, the mixing box is fixedly provided with a motor for driving the stirrer to rotate, and the mixing box is provided with a plurality of air inlet holes.
The preferable technical scheme is that the air flow control device further comprises a control component for controlling the air flow through the conveying pipe.
The preferred technical scheme is that the conveying pipe is a flexible pipe, and the control assembly comprises an extrusion part for extruding the flexible pipe and changing the diameter of the flexible pipe.
The preferable technical scheme is that the extrusion piece comprises a fixed clamping plate and a movable clamping plate which are arranged on two sides of the conveying pipe, and the fixed clamping plate is fixedly connected with the mixing box; the movable clamping plate is characterized by further comprising a driving piece used for driving the movable clamping plate to approach or separate from the fixed clamping plate.
The preferable technical scheme is that the driving piece comprises an air cylinder fixedly connected with the mixing box; the control assembly further comprises a wind pressure sensor arranged at the hot air inlet, and the wind pressure sensor is electrically connected with the controller of the air cylinder.
The preferable technical scheme is that the spinning assembly further comprises a filter screen, a spinneret plate, an air duct plate and a sealing plate, wherein the flow channel plate, the filter screen, the spinneret plate and the air duct plate are sequentially arranged along the flow direction of the melt; the two runner plates are matched to form a runner for the melt to pass through; the spinneret plate is provided with a plurality of spinneret holes at intervals; the two air duct plates are respectively arranged at two sides of the spinneret hole, and a wire drawing air duct is arranged between the air inducing inclined plane of the air duct plates and the spinneret tip of the spinneret plate at intervals; the sealing plate is fixedly arranged on two sides of the flow passage plate, the spinneret plate and the air duct plate.
The preferable technical scheme is that the lower wall of the runner plate is provided with a plurality of hot air outlets communicated with the hot air channels, the spinneret plate is provided with hot air channels, and the hot air channels are communicated with the hot air outlets and the wire drawing air channels.
The preferable technical scheme is that the diameter of the hot air outlet is smaller than that of the hot air inlet.
The preferable technical scheme is that the distance between the induced air inclined plane of the air duct plate and the spinneret tip of the spinneret plate is 0.8mm.
The invention has the advantages and beneficial effects that: the melt-blown fabric spinneret plate air supply device is reasonable in structure, the plurality of hot air inlets are formed in the side wall of the runner plate, hot air before entering the hot air inlets is uniformly mixed in the mixing box, so that the air temperature and the air pressure at each place are consistent, and then the hot air enters the hot air inlets through the conveying pipe; compared with the prior art, the hot air channel has the advantages that the phenomena of high middle temperature and low temperature of the end part of the hot air channel and low middle air pressure of the end part of the hot air channel can be avoided, the temperature and the air pressure in the spinneret plate are consistent, the fiber sprayed out of the spinneret plate is consistent, and the yield of melt-blown cloth is improved.
Drawings
FIG. 1 is a schematic view of an embodiment of a meltblowing spinneret air supply apparatus of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic view of a blower assembly;
FIG. 4 is an exploded view of FIG. 3;
FIG. 5 is a schematic structural view of a spin pack;
FIG. 6 is an exploded view of FIG. 5;
FIG. 7 is a cross-sectional view of FIG. 5;
FIG. 8 is a cross-sectional view of FIG. 6;
FIG. 9 is a schematic view of the structure of a flow field plate;
FIG. 10 is a cross-sectional view of FIG. 9;
in the figure: 1. a flow channel plate; 11. a hot air channel; 12. a hot air inlet; 13. a flow passage; 14. a hot air outlet; 2. a mixing box; 21. an air outlet; 22. an air inlet; 3. a delivery tube; 4. a stirrer; 41. a motor; 51. a fixed clamping plate; 52. a movable clamping plate; 53. a cylinder; 6. a filter screen; 7. a spinneret plate; 71. a spinneret orifice; 72. a spinning tip; 73. a hot air duct; 8. an air duct plate; 81. an induced draft inclined plane; 82. a wire drawing air duct; 9. and (5) sealing the plate.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Examples
As shown in fig. 1-10, the air supply device of the melt blowing spinneret plate of the embodiment comprises a spinneret assembly and an air supply assembly for supplying air to the spinneret assembly, wherein the spinneret assembly comprises a runner plate 1 for guiding melt to flow, the runner plate 1 is provided with a hot air channel 11, and the side wall of the runner plate 1 is provided with a plurality of hot air inlets 12 communicated with the hot air channel 11; the air supply assembly comprises a hot air source and a mixing box 2 for uniformly mixing the air output by the hot air source, wherein the mixing box 2 is provided with air outlets 21, the air outlets 21 are in one-to-one correspondence with the hot air inlets 12, and the air outlets 21 are communicated with the hot air inlets 12 through conveying pipes 3.
Through the design, the runner plate 1 not only plays a role in guiding the flow of the melt, but also plays a role in conveying high-temperature and high-pressure hot air; a plurality of hot air inlets 12 are formed in the side wall of the runner plate 1, and an air inlet channel is increased, so that the hot air channel 11 is ensured to be filled with hot air rapidly; the mixing box 2 ensures that the temperature and the wind pressure of hot air before entering the hot air inlet 12 are consistent, and then the hot air is conveyed to the hot air inlet 12 through the conveying pipe 3, so that the phenomena of high and low middle temperature at the end part of the hot air channel 11 and low middle wind pressure at the end part of the hot air channel are avoided, the temperature and the wind pressure in the spinneret plate are consistent, the uniformity of fibers sprayed out of the spinneret plate is ensured, and the yield of melt blown cloth is improved.
Specifically, the mixing box 2 is internally provided with a stirrer 4, the stirrer 4 is provided with a plurality of stirring devices, the mixing box 2 is fixedly provided with a motor 41 for driving the stirrer 4 to rotate, and the mixing box 2 is provided with a plurality of air inlets 22.
By such design, the stirrer 4 stirs and mixes the hot air flow in the mixing box 2, and the wind pressure and the wind temperature in the mixing box 2 are uniform, so that the wind temperature and the wind pressure of the hot air entering each conveying pipe 3 are uniform.
Further, a control assembly for controlling the flow of wind through said duct 3 is included.
By such a design, when the wind pressure of a certain hot air inlet 12 is too large, the hot air flow of the corresponding conveying pipe 3 can be properly reduced, thereby reducing the amount of hot air entering the hot air inlet 12.
In particular, the delivery tube 3 is a flexible tube, and the control assembly comprises an extrusion for extruding the flexible tube, changing its diameter.
Through such design, conveyer pipe 3 can deform, thereby the extrusion piece can extrude conveyer pipe 3 and reduce conveyer pipe 3's diameter, reaches the purpose that reduces the hot-blast flow through conveyer pipe 3.
Specifically, the extrusion piece comprises a fixed clamping plate 51 and a movable clamping plate 52 which are arranged at two sides of the conveying pipe 3, and the fixed clamping plate 51 is fixedly connected with the mixing box 2; and a driving member for driving the movable clamping plate 52 to approach or separate from the fixed clamping plate 51.
By such a design, the driving member controls the position of the movable clamping plate 52, and changes the diameter of the delivery tube 3 in cooperation with the fixed clamping plate 51.
Specifically, the driving member includes an air cylinder 53 fixedly connected with the mixing box 2; the control assembly further includes a wind pressure sensor disposed at the hot air inlet 12, the wind pressure sensor being electrically connected with the controller of the air cylinder 53.
Through the design, the wind pressure sensor can detect whether the wind pressure at the hot air inlet 12 exceeds the standard, and when the air pressure exceeds the standard, the controller controls the piston rod of the air cylinder 53 to extend, and drives the movable clamping plate 52 to approach the fixed clamping plate 51 to squeeze the conveying pipe 3; the wind pressure sensor can be selected from the common sensors on the market, preferably He Di HDP862 model.
Specifically, the spinning assembly further comprises a filter screen 6, a spinneret plate 7, an air duct plate 8 and a sealing plate 9, wherein the runner plate 1, the filter screen 6, the spinneret plate 7 and the air duct plate 8 are sequentially arranged along the flowing direction of the melt; the two runner plates 1 are matched to form a runner 13 for the melt to pass through; the spinneret plate 7 is provided with a plurality of spinneret holes 71 at intervals; the two air duct plates 8 are respectively arranged at two sides of the spinneret hole 71, and a wire drawing air duct 82 is arranged between an air inducing inclined plane 81 of each air duct plate 8 and the spinneret tip 72 of the spinneret plate 7 at intervals; the sealing plate 9 is fixedly arranged on two sides of the runner plate 1, the spinneret plate 7 and the air duct plate 8.
By such design, the normal spinning operation of the spinning assembly is ensured.
Specifically, the lower wall of the runner plate 1 is provided with a plurality of hot air outlets 14 communicated with the hot air channel 11, the spinneret plate 7 is provided with a hot air channel 73, and the hot air channel 73 is communicated with the hot air outlets 14 and the wire drawing air channel 82.
By such a design, the hot air introduced into the hot air passage 11 from the hot air inlet 12 is discharged from the hot air outlet 14, guided into the drawing air passage 82 through the hot air passage 73 of the spinneret 7, and the high-temperature and high-pressure hot air discharged from the drawing air passage 82 draws the fibers extruded from the spinneret holes 72.
Further, the diameter of the hot air outlet 14 is smaller than the diameter of the hot air inlet 12.
By such a design, the magnitude of the wind pressure of the hot wind entering the hot wind channel 73 is increased.
Further, the distance between the air guiding inclined plane 81 of the air duct plate 8 and the spinneret tip 72 of the spinneret plate 7 is 0.8mm.
Compared with the distance between the air inducing inclined plane 81 and the spinning tip 72 outside the above range, the design can ensure that enough pressure is applied to the fiber, the pressure is not too large, and the molding of the fiber is ensured.
Further, the hot air outlet 14 is provided with an air temperature sensor electrically connected to the hot air source.
Through the design, the hot air temperature of the hot air source is controlled through the air temperature sensor, so that the hot air temperature in the hot air channel 11 is ensured to reach the standard; the wind temperature sensor may be a commercially available temperature sensor, preferably model He Lishi PT 100.
The specific use mode of the embodiment is as follows:
feeding the Z-1800 polypropylene raw material into a screw extruder to form a molten state, metering the molten material into a spinning assembly from a runner 13 through a metering pump after filtering, filtering the molten material in the spinning assembly through a filter screen 6 under the drainage state of the runner 13, feeding the molten material into a spinneret plate 7, and spraying the molten material from a spinneret orifice 71;
the hot air source conveys hot air into the mixing box 2 from the air inlet 22, the motor 41 drives the stirrer 4 to rotate, the hot air in the mixing box 2 is uniformly mixed, the temperature and the air pressure of the hot air in the mixing box 2 are uniform, then the hot air in the mixing box 2 enters the hot air channel 11 from the hot air inlet 12 through the conveying pipe 3, the hot air in the hot air channel 11 is discharged from the hot air outlet 14 into the hot air channel 73, then enters the wire drawing air channel 82, and the fiber sprayed from the wire spraying hole 71 is forced by blowing out from the wire drawing air channel 82;
when the wind pressure sensor detects that the wind pressure of the hot air inlet 12 at a certain position exceeds the standard, the controller of the corresponding air cylinder 53 controls the piston rod of the air cylinder 53 to extend, and the movable clamping plate 52 is driven to approach the fixed clamping plate 51, so that the conveying pipe 3 is extruded, the air quantity passing through the conveying pipe 3 is reduced, and the air quantity passing through the hot air inlet 12 is reduced.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (10)
1. The melt blowing spinneret plate air supply device is characterized by comprising a spinneret assembly and an air supply assembly for supplying air to the spinneret assembly, wherein the spinneret assembly comprises a runner plate (1) for guiding melt to flow, the runner plate (1) is provided with a hot air channel (11), and the side wall of the runner plate (1) is provided with a plurality of hot air inlets (12) communicated with the hot air channel (11); the air supply assembly comprises a hot air source and a mixing box (2) for uniformly mixing the air output by the hot air source, wherein the mixing box (2) is provided with air outlets (21), the air outlets (21) are in one-to-one correspondence with the hot air inlets (12), and the air outlets (21) are communicated with the hot air inlets (12) through conveying pipes (3).
2. The melt blowing spinneret air supply device according to claim 1, wherein a stirrer (4) is arranged in the mixing box (2), the stirrer (4) is provided with a plurality of stirring holes, the mixing box (2) is fixedly provided with a motor (41) for driving the stirrer (4) to rotate, and the mixing box (2) is provided with a plurality of air inlet holes (22).
3. The meltblowing spinneret air supply according to claim 1, further comprising a control assembly for controlling the flow of air through the delivery tube (3).
4. A meltblowing spinneret air supply according to claim 3, wherein the delivery tube (3) is a flexible tube and the control assembly comprises an extrusion for extruding the flexible tube to vary its diameter.
5. The melt blown spinneret air supply device according to claim 4, wherein the extrusion comprises a fixed clamping plate (51) and a movable clamping plate (52) arranged at both sides of the conveying pipe (3), and the fixed clamping plate (51) is fixedly connected with the mixing box (2); the movable clamping plate (52) is driven to approach or separate from the fixed clamping plate (51).
6. The meltblowing spinneret air supply according to claim 5, wherein the drive comprises a cylinder (53) fixedly connected to the mixing box (2); the control assembly further comprises a wind pressure sensor arranged at the hot air inlet (12), and the wind pressure sensor is electrically connected with a controller of the air cylinder (53).
7. The melt-blowing spinneret air supply device according to claim 1, wherein the spinneret assembly further comprises a filter screen (6), a spinneret (7), an air duct plate (8) and a sealing plate (9), and the flow duct plate (1), the filter screen (6), the spinneret (7) and the air duct plate (8) are sequentially arranged along the flow direction of the melt; the two runner plates (1) are matched to form a runner (13) for the melt to pass through; the spinneret plate (7) is provided with a plurality of spinneret orifices (71) at intervals; the two air duct plates (8) are respectively arranged at two sides of the spinneret hole (71), and a wire drawing air duct (82) is arranged between an induced air inclined plane (81) of the air duct plate (8) and a spinneret tip (72) of the spinneret plate (7) at intervals; the sealing plate (9) is fixedly arranged on two sides of the runner plate (1), the spinneret plate (7) and the air duct plate (8).
8. The melt-blown fabric spinneret air supply device according to claim 7, wherein the lower wall of the runner plate (1) is provided with a plurality of hot air outlets (14) communicated with the hot air channel (11), the spinneret (7) is provided with a hot air channel (73), and the hot air channel (73) is communicated with the hot air outlets (14) and the wire drawing air channel (82).
9. The meltblowing spinneret air supply according to claim 8, wherein the diameter of the hot air outlet (14) is smaller than the diameter of the hot air inlet (12).
10. The meltblowing spinneret air supply according to claim 7, wherein the distance between the air guiding inclined surface (81) of the air duct plate (8) and the spinneret tip (72) of the spinneret (7) is 0.8mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202311327348.7A CN117344394A (en) | 2023-10-13 | 2023-10-13 | Melt-blown cloth spinneret air supply device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202311327348.7A CN117344394A (en) | 2023-10-13 | 2023-10-13 | Melt-blown cloth spinneret air supply device |
Publications (1)
Publication Number | Publication Date |
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CN117344394A true CN117344394A (en) | 2024-01-05 |
Family
ID=89358994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202311327348.7A Pending CN117344394A (en) | 2023-10-13 | 2023-10-13 | Melt-blown cloth spinneret air supply device |
Country Status (1)
Country | Link |
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CN (1) | CN117344394A (en) |
-
2023
- 2023-10-13 CN CN202311327348.7A patent/CN117344394A/en active Pending
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