CN112796094B - Corona electret equipment capable of resisting charge attenuation and application method - Google Patents
Corona electret equipment capable of resisting charge attenuation and application method Download PDFInfo
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- CN112796094B CN112796094B CN202011482716.1A CN202011482716A CN112796094B CN 112796094 B CN112796094 B CN 112796094B CN 202011482716 A CN202011482716 A CN 202011482716A CN 112796094 B CN112796094 B CN 112796094B
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
- D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
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Abstract
The invention relates to the technical field of electret manufacturing of melt-blown nonwoven materials, in particular to corona electret equipment capable of resisting charge attenuation and an application method. According to the invention, through the arrangement, an object needing to be subjected to electret, such as non-woven fabric, passes through the insulating electret roller and the metal electret roller to be subjected to twice electret, and a large amount of body charges, polarization charges and surface charges are covered, so that the anti-charge attenuation performance of the object is greatly provided.
Description
Technical Field
The invention relates to the technical field of electret manufacturing of melt-blown nonwoven materials, in particular to corona electret equipment capable of resisting charge attenuation and an application method.
Background
At present, common melt-blown nonwoven production lines in China are commonly used in a corona electret process, wherein a corona discharge of local breakdown caused by a non-uniform electric field is utilized to generate an ion beam to bombard a dielectric so as to enable the dielectric to be charged. The discharge wire is usually placed on a metal guide roller for corona electret, and the manner comprises single-sided electret, double-sided electret, plasma electret and other electret processes. In terms of the electret mechanism, the electret process produces three charges, which are surface charges (charges trapped on the surface of the material), bulk charges (space charges inside the material) and polarization charges (permanent charges), respectively. The amount of polarization charge and bulk charge therein determines the charge storage capacity and lifetime of the nonwoven material. However, the existing common electret process has strong surface static electricity, but is not optimistic in anti-attenuation, has larger charge attenuation at normal temperature, and starts to attenuate by 5-10% after being placed for 3 days; the decay in the accelerated aging simulation test is more pronounced.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned problems and providing a corona electret device that is resistant to charge decay.
For solving the technical problem, in this technical scheme, provide a corona electret equipment that can anti charge decay, equipment includes high voltage pulse power supply unit, high voltage junction box and electret mounting bracket, be equipped with metal electret roller and insulating electret roller on the electret mounting bracket, metal electret roller corresponds the position department and is equipped with the first portion that discharges that is used for discharging, insulating electret roller corresponds position department and is equipped with the second portion that discharges, first portion, the second portion that discharges all are connected with high voltage pulse power supply unit electricity through the high voltage junction box.
According to the invention, the first discharge part for discharging is arranged at the corresponding position of the metal electret roller, the second discharge part for discharging is arranged at the corresponding position of the insulating electret roller, and the first discharge part and the second discharge part are electrically connected with the high-voltage pulse power supply device through the high-voltage junction box, so that an object needing to be subjected to electret, such as non-woven cloth, is subjected to two-time electret through the insulating electret roller and the metal electret roller, a large amount of body charges, polarization charges and surface charges are covered, and the anti-charge attenuation performance of the object is greatly improved.
Preferably, the electret mounting frame comprises a mounting frame main body, and the metal electret roller, the first discharging part, the insulating electret roller and the second discharging part are sequentially arranged on the mounting frame main body from bottom to top. Through the setting of metal electret roller, first portion of discharging, insulating electret roller, second portion of discharging from down up installing in order in the mounting bracket main part for it is fixed in the mounting bracket main part in order, and the object that is convenient for need carry out the electret like nonwoven loops through insulating electret roller and metal electret roller, orderly completion electret, forms twice electret, and because it is from last down vertically to set up can save installation space. Preferably, the metal electret rolls and the insulating electret rolls are arranged as linearly as possible to reduce the pulling force of the pulling nonwoven.
Preferably, the distance between the first discharge part and the metal electret roller is 50-100 mm, and the distance between the second discharge part and the insulation electret roller is 5-15 mm. The orientations of these values are preferred, and are not intended to be limiting. The distance between the second discharging part above the insulating electret roller and the near-discharge wire is preferably 5-15 mm, when the distance is less than 5mm, the cloth cover is difficult to shake slightly in the production process, and the distance is too small to scratch the discharge wire so as to cause cloth breakage or wire breakage; when the distance is more than 15mm, the attenuation of the nonwoven fabric starts to increase after accelerated aging at 100℃for 48 hours. The distance between the first discharge part on the metal electret roll and the far molybdenum wire is preferably 50-100 mm, and the first discharge part is mainly used for ensuring that the non-woven fabric is not discharged in the electret process. Of course, the distance can be set as long as the nonwoven fabric is ensured not to discharge in the electret process.
Preferably, the first discharge part and the second discharge part are both molybdenum wires or tungsten wires. The arrangement of the first discharge part and the second discharge part which are both molybdenum wires or tungsten wires is preferable, and other materials are feasible as long as the corresponding operation can be completed by high-voltage and large-scale discharge.
Preferably, the high voltage junction box is provided with an alarm device. The alarm device is arranged to prompt the working state. When the molybdenum wire or tungsten wire is disconnected in the production process, the alarm device starts to work to prompt. In addition, the high-voltage wiring box is also internally provided with a broken wire protection installation insulating plate and a broken wire protection shaft, and the broken wire protection shaft and the alarm device are both installed on the broken wire protection installation insulating plate.
Preferably, the high-voltage pulse power supply device is provided with a display and a controller for controlling the whole working state, and the controller is electrically connected with the display and integrated into a controllable display screen.
Preferably, the high-voltage pulse power supply device is electrically connected with the high-voltage wiring box through a high-voltage wire sleeved with a high-voltage protective sleeve. This connection is to improve security.
Preferably, the mounting frame main body is provided with a first fixing plate and a second fixing plate, and the metal electret roller, the first discharge part insulating electret roller and the second discharge part are all arranged between the first fixing plate and the second fixing plate. The metal electret roller, the first discharge part insulating electret roller and the second discharge part are fixed between the first fixing plate and the second fixing plate, and the first fixing plate and the second fixing plate are made of insulating materials, so that space can be saved, and meanwhile, safety can be improved.
Preferably, both ends of the first discharging part and the second discharging part are fixedly installed with the first fixing plate and the second fixing plate through insulating columns, and the first discharging part and the second discharging part are electrically connected with the high-voltage junction box through insulating corrugated pipe joints. This is to reliably fix the first and second discharge portions, ensure effective energization of the first and second discharge portions, and improve safety thereof.
The invention also provides an application method of the corona electret device capable of resisting charge attenuation, which comprises the following specific steps:
(1) Starting a high-voltage pulse power supply device, wherein the high-voltage pulse power supply device generates high-voltage electricity and transmits the high-voltage electricity to the first discharging part and the second discharging part;
(2) Conveying the non-woven fabric to an insulating electret roller, and enabling a second discharging part on the insulating electret roller to be closely attached to the fabric surface to perform high-voltage bombardment discharge, wherein a large amount of body charges and polarization charges are covered on the non-woven fabric due to the existence of the insulating roller;
(3) Then, conveying the non-woven fabric to a metal electret roller, and carrying out high-voltage bombardment discharge on the non-woven fabric by a first discharge part on the metal electret roller, wherein a large amount of surface charges are covered on the non-woven fabric due to the existence of the metal roller;
(4) And finishing the pole residence.
The invention starts the high-voltage pulse power supply, the high-voltage pulse power supply generator generates high-voltage electricity, the non-woven fabric in the conveying process firstly passes through the insulating roller, the discharge wires on the insulating roller cling to the fabric surface to carry out high-voltage bombardment discharge, and the charge types of the non-woven fabric are mainly bulk charge and polarization charge due to the existence of the insulating roller. The nonwoven continues to be transported forward and then undergoes a metal electret roll and discharge wire region which again undergoes a high voltage bombardment discharge, the electric field of which is mostly surface charges due to the presence of the metal roll. Through the two electret layers, the anti-charge decay performance of the non-woven fabric is obviously improved.
Compared with the prior art, the beneficial effects are that:
according to the invention, the first discharge part for discharging is arranged at the corresponding position of the metal electret roller, the second discharge part for discharging is arranged at the corresponding position of the insulating electret roller, and the first discharge part and the second discharge part are electrically connected with the high-voltage pulse power supply device through the high-voltage junction box, so that an object needing to be subjected to electret, such as non-woven cloth, is subjected to two-time electret through the insulating electret roller and the metal electret roller, a large amount of body charges, polarization charges and surface charges are covered, and the anti-charge attenuation performance of the object is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a corona electret device that is resistant to charge decay;
fig. 2 is a left side view of fig. 1.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are orientations or positional relationships indicated by terms "upper", "lower", "left", "right", "long", "short", etc., based on the orientations or positional relationships shown in the drawings, this is merely for convenience in describing the present invention and simplifying the description, and is not an indication or suggestion that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that it is possible for those of ordinary skill in the art to understand the specific meaning of the terms described above according to specific circumstances.
The technical scheme of the invention is further specifically described by the following specific embodiments with reference to the accompanying drawings:
examples
As shown in fig. 1 to 2, the corona electret device capable of resisting charge attenuation comprises a high-voltage pulse power supply device 1, a high-voltage junction box 2 and an electret mounting frame 3, wherein a metal electret roller 31 and an insulating electret roller 32 are arranged on the electret mounting frame 3, a first discharge part 33 for discharging is arranged at a position corresponding to the metal electret roller 31, a second discharge part 34 for discharging is arranged at a position corresponding to the insulating electret roller 32, and the first discharge part 33 and the second discharge part 34 are electrically connected with the high-voltage pulse power supply device 1 through the high-voltage junction box 2.
The electret mounting frame 3 comprises a mounting frame main body 35, and the metal electret roller 31, the first discharging part 33, the insulating electret roller 32 and the second discharging part 34 are sequentially arranged on the mounting frame main body 35 from bottom to top. Through the setting of metal electret roller, first portion of discharging, insulating electret roller, second portion of discharging from down up installing in order in the mounting bracket main part for it is fixed in the mounting bracket main part in order, and the object that is convenient for need carry out the electret like nonwoven loops through insulating electret roller and metal electret roller, orderly completion electret, forms twice electret, and because it is from last down vertically to set up can save installation space. Preferably, the metal electret rolls and the insulating electret rolls are arranged as linearly as possible to reduce the pulling force of the pulling nonwoven.
The distance between the first discharge portion 33 and the metal electret roller 31 is 50mm to 100mm, and the distance between the second discharge portion 34 and the insulation electret roller 32 is 5mm to 15mm. The orientations of these values are preferred, and are not intended to be limiting. The distance between the second discharging part above the insulating electret roller and the near-discharge wire is preferably 5-15 mm, when the distance is less than 5mm, the cloth cover is difficult to shake slightly in the production process, and the distance is too small to scratch the discharge wire so as to cause cloth breakage or wire breakage; when the distance is more than 15mm, the attenuation of the nonwoven fabric starts to increase after accelerated aging at 100℃for 48 hours. The distance between the first discharge part on the metal electret roll and the far molybdenum wire is preferably 50-100 mm, and the first discharge part is mainly used for ensuring that the non-woven fabric is not discharged in the electret process. Of course, the distance can be set as long as the nonwoven fabric is ensured not to discharge in the electret process.
The first discharge portion 33 and the second discharge portion 34 are both molybdenum wires or tungsten wires. The arrangement of the first discharge part and the second discharge part which are both molybdenum wires or tungsten wires is preferable, and other materials are feasible as long as the corresponding operation can be completed by high-voltage and large-scale discharge.
The high-voltage junction box 2 is provided with an alarm device 21 for indicating the operating state. The alarm device is arranged to prompt the working state. When the molybdenum wire or tungsten wire is disconnected in the production process, the alarm device starts to work to prompt. In addition, the high-voltage wiring box is also internally provided with a broken wire protection installation insulating plate and a broken wire protection shaft, and the broken wire protection shaft and the alarm device are both installed on the broken wire protection installation insulating plate.
The high-voltage pulse power supply device 1 is provided with a display and a controller for controlling the whole working state, and the controller is electrically connected with the display and integrated into a controllable display screen 11.
The high-voltage pulse power supply device 1 is electrically connected to the high-voltage junction box 2 via a high-voltage line 4 covered with a high-voltage protection cover. This connection is to improve security.
The mounting frame body 35 is provided with a first fixing plate 351 and a second fixing plate 352, and the metal electret roller 31, the first discharging portion 33, the insulating electret roller 32, and the second discharging portion 34 are all mounted between the first fixing plate 351 and the second fixing plate 352. The metal electret roller, the first discharge part insulating electret roller and the second discharge part are fixed between the first fixing plate and the second fixing plate, and the first fixing plate and the second fixing plate are made of insulating materials, so that space can be saved, and meanwhile, safety can be improved.
Both ends of the first and second discharge portions 33 and 34 are fixedly attached to the first and second fixing plates 351 and 352 by the insulating columns 5, and the first and second discharge portions 33 and 34 are electrically connected to the high-voltage junction box 2 by the insulating bellows joint 6. This is to reliably fix the first and second discharge portions, ensure effective energization of the first and second discharge portions, and improve safety thereof.
The invention also provides an application method of the corona electret device capable of resisting charge attenuation, which comprises the following specific steps:
(1) Starting a high-voltage pulse power supply device 1, wherein the high-voltage pulse power supply device generates high-voltage electricity and transmits the high-voltage electricity to the first discharging part 33 and the second discharging part 34;
(2) The non-woven fabric is conveyed to an insulating electret roller 32, a second discharging part 34 on the insulating electret roller 32 is closely attached to the fabric surface to perform high-voltage bombardment discharge, and the type of charges carried on the non-woven fabric is bulk charges and polarized charges due to the existence of the insulating roller;
(3) Then the non-woven fabric is conveyed to a metal electret roller 31, and a first discharge part 33 on the metal electret roller 31 carries out high-voltage bombardment discharge on the non-woven fabric, and the type of charges carried on the non-woven fabric is surface charges due to the existence of the metal roller;
(4) And finishing the pole residence.
Specifically: as shown in fig. 1 and 2, the metal electret roller and the insulating electret roller comprise a mounting frame main body 35, a left fixing plate and a right fixing plate which are mounted on the mounting frame main body 35, and a metal electret roller and an insulating electret roller 32 which are horizontally arranged between the two fixing plates, wherein a near molybdenum wire is arranged above the insulating electret roller 32, and a far molybdenum wire is arranged above the metal electret roller. One side of the electret mounting frame 3 is provided with a high-voltage pulse power supply device 1 with a PLC control display screen, and the device is grounded.
As shown in fig. 1, the distance between the near molybdenum wires above the insulating electret roll 32 is 7mm and the distance between the far molybdenum wires 3 above the metal electret roll 31 is 70mm, and the wires are pulled up on the left and right fixing plates by insulating columns 5 at both ends and then connected with a high-voltage junction box 2 by insulating bellows joints 6. The insulating columns 5 at the two ends of the molybdenum wire are matched with a hand wheel, a fastening wheel cover and a fastening nut for tensioning the molybdenum wire. The high-voltage wiring box 2 is internally provided with a broken wire protection installation insulating plate, an alarm and a broken wire protection shaft, and when molybdenum wires are broken in the production process, the alarm device 21 works. The high-voltage pulse power supply 1 is connected with the high-voltage wiring box 2 through a high-voltage wire 4 sleeved with a high-voltage protective sleeve. When the high-voltage wiring box 2 works, stronger voltage exists nearby, and the contact with the conductive material is forbidden, so that the working or personal safety is influenced.
After the distance of the molybdenum wires is set, the non-woven fabric is wound at a constant speed under constant winding tension, a high-voltage pulse power supply is started, and a high-voltage pulse power supply generator is provided with 80KV high-voltage power.
In this example, the grammage of the nonwoven fabric was 25g/m 2 The production line speed is 30m/min. To evaluate the ability to verify resistance to charge decay, we tested the filtration efficiency of 0.3um particles for different samples before and after heat aging at 100 ℃ by comparison. The specific data are shown in tables 1 and 2. Test results show that the electret equipment and the process have excellent charge decay resistance.
Table 1 test data for conventional electret assembly and process
TABLE 2 test data for the inventive electret assembly and process
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The corona electret device capable of resisting charge attenuation is characterized by comprising a high-voltage pulse power supply device (1), a high-voltage junction box (2) and an electret mounting frame (3), wherein a metal electret roller (31) and an insulating electret roller (32) are arranged on the electret mounting frame (3), a first discharge part (33) for discharging is arranged at a position corresponding to the metal electret roller (31), a second discharge part (34) for discharging is arranged at a position corresponding to the insulating electret roller (32), and the first discharge part (33) and the second discharge part (34) are electrically connected with the high-voltage pulse power supply device (1) through the high-voltage junction box (2);
the metal electret roller (31) and the insulating electret roller (32) are used for enabling an object to be subjected to electret to sequentially pass through the insulating electret roller (32) and the metal electret roller (31).
2. The corona electret arrangement resistant to charge decay according to claim 1, characterized in that the electret mounting (3) comprises a mounting body (35), the metal electret roll (31), the first discharge section (33), the insulating electret roll (32), the second discharge section (34) being mounted in sequence from bottom to top on the mounting body (35).
3. The corona electret arrangement, which is resistant to charge decay, according to claim 1, characterized in that the first discharge part (33) is at a distance of 50-100 mm from the metal electret roll (31) and the second discharge part (34) is at a distance of 5-15 mm from the insulating electret roll (32).
4. A corona electret arrangement as claimed in any one of claims 1 to 3, characterized in that the first discharge (33) and the second discharge (34) are each molybdenum or tungsten wires.
5. Corona electret arrangement which is resistant to charge decay according to claim 1, characterized in that the high-voltage junction box (2) is provided with an alarm device (21).
6. Corona electret device with resistance to charge decay according to claim 1, characterized in that the high voltage pulse power supply means (1) is provided with a display and a controller controlling the overall operating state, which is electrically connected to the display and integrated into a controllable display screen (11).
7. The corona electret arrangement capable of resisting charge decay according to claim 1, characterized in that the high voltage pulse power supply device (1) is electrically connected to the high voltage junction box (2) via a high voltage line (4) sheathed with a high voltage protective sheath.
8. The corona electret device capable of resisting charge decay according to claim 2, wherein a first fixing plate (351) and a second fixing plate (352) are arranged on the mounting frame main body (35), and the metal electret roller (31), the first discharge part (33) and the second discharge part (34) are arranged between the first fixing plate (351) and the second fixing plate (352).
9. The corona electret device of claim 8, wherein the first and second discharge parts (33, 34) are fixedly mounted at both ends thereof to the first and second fixing plates (351, 352) via insulating posts (5), and the first and second discharge parts (33, 34) are electrically connected to the high-voltage junction box (2) via insulating corrugated tube joints (6).
10. The method of using a corona electret device resistant to charge decay as claimed in any one of claims 1 to 9, characterized by the following specific steps:
(1) Starting a high-voltage pulse power supply device (1), wherein the high-voltage pulse power supply device generates high-voltage electricity and transmits the high-voltage electricity to the first discharging part (33) and the second discharging part (34);
(2) Conveying the non-woven fabric to an insulating electret roller (32), and carrying out high-voltage bombardment discharge on the non-woven fabric by a second discharge part (34) on the insulating electret roller (32) closely attached to the fabric surface, wherein the type of charges carried on the non-woven fabric is bulk charges and polarization charges due to the existence of the insulating roller;
(3) Then, the non-woven fabric is conveyed to a metal electret roller (31), and a first discharge part (33) on the metal electret roller (31) carries out high-voltage bombardment discharge on the non-woven fabric, and the type of charges carried on the non-woven fabric is surface charges due to the existence of the metal roller;
(4) And finishing the pole residence.
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| CN111876994A (en) * | 2020-09-01 | 2020-11-03 | 苏州金纬化纤工程技术有限公司 | Melt-blown electrostatic electret equipment |
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| JP2012085515A (en) * | 2010-09-16 | 2012-04-26 | Murata Mfg Co Ltd | Charging device of electret, charging method of electret, and vibration power generating device |
| CN207998746U (en) * | 2017-11-29 | 2018-10-23 | 东华大学 | A kind of non-woven material tow sides electrostatic electret device simultaneously |
| CN207859683U (en) * | 2017-11-30 | 2018-09-14 | 宣城广能非织造有限公司 | Three layers of non-woven material of one kind while electrostatic electret and online set composite |
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