CN108744713B - Ultrasonic sputtering liquid charging device and method for electret - Google Patents
Ultrasonic sputtering liquid charging device and method for electret Download PDFInfo
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- CN108744713B CN108744713B CN201810490873.3A CN201810490873A CN108744713B CN 108744713 B CN108744713 B CN 108744713B CN 201810490873 A CN201810490873 A CN 201810490873A CN 108744713 B CN108744713 B CN 108744713B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0435—Electret
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
Abstract
The invention discloses an ultrasonic sputtering liquid charging device and method for an electret. In the ultrasonic sputtering charging device for the electret, a liquid groove is in a trapezoid shape, an included angle of 20-65 degrees is formed between the bottom of the liquid groove and the horizontal plane, materials capable of being electret enter the liquid groove from the lower end of the bottom of the liquid groove through an unwinding device, the materials capable of being electret are attached to the bottom of the liquid groove through a first roller shaft and a second roller shaft, ultrasonic waves are applied to the bottom of the liquid groove filled with polar liquid and the materials capable of being electret, the materials capable of being electret are dried through a drying device after exiting the liquid groove, and the charged electret is obtained. The method can simply, efficiently, stably and uniformly charge the electret materials which are compounded in multiple layers and have different thicknesses by adjusting the distances between the first roller shaft and the second roller shaft and the bottom of the liquid tank and changing the inclination of the bottom of the liquid tank.
Description
Technical Field
The invention relates to a liquid charging device and a liquid charging method of an electret, in particular to an ultrasonic liquid sputtering device and a liquid charging method of the electret.
Background
The traditional air filtering material mainly depends on physical and mechanical actions such as Brownian diffusion, interception effect, inertial collision, gravity natural settling and the like to block particles in the air. At present, in the field of air filter materials, the high efficiency and low resistance of materials are pursued, and the air filter materials capable of achieving the high efficiency and low resistance almost adopt electret materials. The material after electret treatment has the filtering function of air filtration and the electrostatic adsorption function besides the physical and mechanical functions. On the premise of ensuring the same filtering efficiency, the pore size of the electret filtering material can be larger than that of the common filtering material, and the pressure difference of the electret filtering material can be reduced by 20-80 times compared with that of the conventional filter.
Chinese patent publication No. CN1129963A, published as 1996, 8/28, entitled "method of charging electret filter medium", is a method of spraying water or water droplet stream under a certain pressure onto a nonwoven substrate of thermoplastic non-conductive microfibers to capture a large amount of electric charges, and this "spray charging" method is effective for materials in which the weight of short fibers is more than 90% of the weight of the nonwoven substrate, but the impact force of water or water droplet stream on the nonwoven substrate formed of long fibers is insufficient to reduce the amount of electric charge of the nonwoven substrate, and in order to improve the filtration efficiency of the substrate, the pressure of water or water droplet stream needs to be increased, increasing the cost and complexity of the process equipment.
Chinese patent publication No. CN1518619A, published as 8/4/2004, entitled "method and apparatus for manufacturing electret, discloses a method of" water suction charging "in which a suction nozzle is brought into contact with a non-conductive fibrous sheet while the sheet is moving, the sheet surface on the opposite side of the contact portion is brought into contact with a water surface or is immersed in water, and water is sucked by the suction nozzle to pass through the sheet in the direction of the sheet. The sheet of non-conductive fibers is then saturated with water to impart a substantial charge to the sheet of fibers, and thereafter dried. The 'water suction charging' method has strong liquid penetrability and can fully act on the electret processed product, but the liquid penetrability is too strong due to the small contact water absorption area of the suction nozzle and the electret processed product, so that the electret processed product with lower strength and thinner thickness is easy to damage.
Chinese patent publication No. CN106964199A, published as 2017, 7, 21, entitled "liquid charging method and device for electret material", the method of "liquid centrifugal jet charging" adopted by the patent, drives surrounding liquid to generate centrifugal jet when rotating by using a roller inner cylinder, and makes the penetrating power of the liquid stronger and more uniform when not damaging a substrate; meanwhile, the porous base material capable of being electret is attached to the outer surface of the roller and is soaked in liquid, so that the contact area of the liquid and the base material is increased, and charging is more uniform. The method has a premise that the condition for achieving the above premise is complex and difficult, and particularly the adaptability to the multi-layer composite electret is poor, namely the liquid has stronger penetrating power and is more uniform when a base material is not damaged, and the multi-layer composite electret is compounded on the different materials with different thicknesses.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a liquid charging apparatus and a liquid charging method for charging an electret formed by mixing long fibers, short fibers or long and short fibers and a multi-layer composite electret having different thicknesses and different materials, particularly an electret having a small thickness and a low strength, which is simple, efficient, uniform and does not damage the electret material.
In order to achieve the above purpose, the technical scheme is as follows.
An ultrasonic sputtering liquid charging device of an electret comprises an unwinding device, a winding device, a liquid charging device and a drying device in liquid charging of the electret, wherein a liquid groove in the charging device is in a ladder shape, the included angle between the bottom of the liquid groove and the horizontal plane is 20-65 degrees, a first roller shaft and a second roller shaft are respectively arranged at two ends of the bottom of the liquid groove, the central lines of the first roller shaft and the second roller shaft are parallel to the bottom of an inclined liquid groove, the adjustable vertical height ranges of the first roller shaft and the second roller shaft from the bottom of the liquid groove are 0.5-50 mm, the center distance between the first roller shaft and the second roller shaft is 0.5-2m, a liquid outlet and a liquid inlet are formed in the side wall of the liquid groove, the liquid outlet is positioned below the central horizontal line of the first roller shaft, the liquid inlet is positioned above the central horizontal line of the second roller shaft, an ultrasonic generator with the power of 500 plus 5000w is, and a drying device consisting of a microwave dryer is arranged between the liquid charging device and the winding device.
An ultrasonic sputtering liquid charging method of an electret, the charging method comprising: the material to be electrized enters the liquid tank filled with polar liquid from the lower end of the bottom of the liquid tank at a linear speed of 1-50m/min through the unwinding device, the material to be electrized firstly passes below the first roller shaft and then passes below the second roller shaft, the distance between the first roller shaft and the bottom of the liquid tank and the distance between the second roller shaft and the bottom of the liquid tank are adjusted, so that the material to be electrized is attached to the bottom of the liquid tank, the polar liquid with a liquid inlet inflow speed of 5-30m/min flows out from the liquid outlet, meanwhile, ultrasonic waves with power of 500-, and after the electret material comes out of the liquid tank, drying the electret material by a drying device to obtain the charged electret.
The material to be electret is a single-layer or multi-layer porous sheet material consisting of natural fibers or chemical fibers or a mixture of the natural fibers and the chemical fibers.
The polar liquid is deionized water or ethanol or a mixture of the two.
Due to the adoption of the technical scheme, the ultrasonic sputtering liquid charging method and device for the electret have the beneficial technical effects that:
(1) by adjusting the distance between the first roller shaft and the second roller shaft and the bottom of the liquid tank, the charging effect of the electret formed by compounding multiple layers of electret materials with different thicknesses and different materials and mixing long fibers, short fibers or long/short fibers is very uniform and stable, the electret has very wide applicability to the electret materials with different components, different materials and different thicknesses, the electret mode is simple and efficient, and the electret can be electrified;
(2) the inclined liquid tank bottom is adopted, so that the electret material soaked by polar liquid has continuous new polar liquid which does not act on the electret material, and meanwhile, the flow speed of the high-frequency vibrating new polar liquid can be adjusted through different inclined angles at the inclined liquid tank bottom, so that the time of the high-frequency vibrating new polar liquid acting on the electret material is adjusted, and the charge quantity and the charge uniformity of the electret material can be improved;
(3) the invention is especially suitable for the material with small thickness and low strength, and the material has soft physical acting force and does not damage the strength of the material.
Drawings
FIG. 1 is a schematic diagram of an ultrasonic sputtering liquid charging process for an electret.
Detailed Description
The invention will be described in further detail in the following description with reference to the figures, which are attached hereto.
An ultrasonic sputtering liquid charging device of an electret comprises an unwinding device, a winding device, a liquid charging device and a drying device in electret liquid charging, wherein a liquid groove 3 in the charging device is in a trapezoid shape, the included angle between the groove bottom of the liquid groove 3 and a horizontal plane is 20-65 degrees, a first roller shaft 4 and a second roller shaft 5 are respectively arranged at two ends of the groove bottom of the liquid groove 3, the central lines of the first roller shaft 4 and the second roller shaft 5 are parallel to the groove bottom of an inclined liquid groove 3, the adjustable vertical height range of the first roller shaft 4 and the second roller shaft 5 from the groove bottom of the liquid groove 3 is 0.5-50 mm, the center distance between the first roller shaft 4 and the second roller shaft 5 is 0.5-2m, a liquid outlet 6 and a liquid inlet 7 are formed in the side wall of the liquid groove, the liquid outlet 6 is positioned below the center horizontal line of the first roller shaft 4, the liquid inlet 7 is positioned above the center, an ultrasonic generator 8 with power of 500 and 5000w is arranged under the liquid groove 3, and a drying device 9 composed of a microwave dryer is arranged between the liquid charging device and the winding device 10.
In the present invention, the first roller 4 and the second roller 5 may be made of an insulating material, preferably ceramic or quartz.
The adjustable vertical height ranges of the first roller shaft 4 and the second roller shaft 5 from the bottom of the liquid tank 3 are both 0.5mm-50mm, and the thickness of the material to be electret is limited to be 0.5mm-50 mm.
The microwave dryer constituting the drying apparatus 9 of the present invention may be a single set or a plurality of sets.
An ultrasonic sputtering liquid charging method of an electret, the charging method comprising: an electret material 11 enters a liquid tank 3 filled with polar liquid from the lower end of the bottom of the liquid tank 3 at a linear speed of 1-50m/min through an unwinding device 1, the electret material 11 firstly passes below a first roller shaft 4 and then passes below a second roller shaft 5, the distance between the first roller shaft 4 and the bottom of the liquid tank 3 and the distance between the second roller shaft 5 and the bottom of the liquid tank 3 are adjusted, so that the electret material is attached to the bottom of the liquid tank 3, the polar liquid with the inflow rate of 5-30m/min flows into a liquid inlet 6, the polar liquid flows out from a liquid outlet 7, ultrasonic waves with the power of 500 plus 5000w are applied to the bottom of the liquid tank 3 filled with the electret material 11 soaked by the polar liquid at the bottom of the liquid tank 3, the ultrasonic waves act on the electret material 11 soaked by the polar liquid to cause the high-frequency vibration of the polar liquid, and the high-frequency vibrating polar liquid impacts the electret material 11 soaked by the polar liquid at the bottom of the liquid tank 3, and after the electret material 11 comes out of the liquid tank 3, drying the electret material by a drying device 9 to obtain a charged electret. The material to be electret is a single-layer or multi-layer porous sheet material consisting of natural fibers or chemical fibers or a mixture of the natural fibers and the chemical fibers. The polar liquid is deionized water or ethanol or a mixture of the two.
In the invention, the material to be electret is required to pass through a corona discharge device 2 for corona treatment before entering a liquid tank.
The thicker the material 11 to be elected is, the longer the charging time in the liquid charging device is needed, the linear speed of the material to be elected is reduced to 1-50m/min, the central distance between the first roller shaft 4 and the second roller shaft 5 is 0.5-2m to prolong the charging time in the liquid charging device, and the electret strength of the material to be elected by the polar liquid is increased by increasing the angle of the inclined liquid groove 3 by 20-65 degrees, increasing the inflow speed of the polar liquid by 5-30m/min and increasing the power of the ultrasonic wave generating device by 500-.
Example 1
According to the schematic diagram of the charging process of ultrasonic sputtering liquid of an electret in fig. 1, a 50mm single-layer porous natural fiber sheet material is firstly processed by corona treatment through an unwinding device at a linear speed of 1m/min, enters a liquid tank filled with deionized water from the lower end of the bottom of a 65-degree inclined liquid tank, the distance between a first roller shaft made of ceramic and the central line of a second roller shaft made of ceramic is 2m, the vertical distance between the first roller shaft made of ceramic and the bottom of the liquid tank is adjusted to be 50mm, so that the 50mm single-layer porous natural fiber sheet material which is firstly processed below the first roller shaft made of ceramic and then processed below the second roller shaft made of ceramic is attached to the bottom of the liquid tank, and ultrasonic waves with the power of 5000w are applied to the bottom of the liquid tank filled with the 50mm single-layer porous natural fiber sheet material soaked in deionized water, the ultrasonic wave acts on the 50mm single-layer porous natural fiber sheet material soaked by the deionized water to cause the deionized water to vibrate at high frequency, the deionized water vibrating at high frequency impacts the 50mm single-layer porous natural fiber sheet material soaked by the deionized water, and the sheet material is dried by a drying device after coming out of a liquid tank, so that the electret with uniform and stable charging effect is obtained.
Example 2
According to the schematic diagram of the charging process of ultrasonic sputtering liquid of an electret in figure 1, 0.5mm multi-layer porous chemical fiber sheet material is firstly processed by corona treatment through an unwinding device at a linear speed of 10m/min, enters a liquid tank filled with ethanol from the lower end of the bottom of a liquid tank inclined at 20 degrees, the distance between a first roller shaft made of quartz and the central line of a second roller shaft made of quartz is 0.5m, and the vertical distance between the first roller shaft made of quartz and the bottom of the liquid tank is 0.5mm by adjusting the vertical distance between the second roller shaft made of quartz and the bottom of the liquid tank, so that the liquid tank is attached to the bottom of the liquid tank filled with 0.5mm multi-layer porous chemical fiber sheet material soaked by ethanol, and ultrasonic waves with a power of 500w are applied to the bottom of the liquid tank, the ultrasonic wave acts on the 0.5mm multi-layer porous chemical fiber sheet-shaped material soaked by the ethanol to cause the ethanol to vibrate at high frequency, the ethanol vibrating at high frequency impacts the 0.5mm multi-layer porous chemical fiber sheet-shaped material soaked by the ethanol, and when the 0.5mm multi-layer porous chemical fiber sheet-shaped material comes out from the liquid tank, the drying device dries the multi-layer porous chemical fiber sheet-shaped material, so that the electret with uniform and stable charging effect is obtained.
Example 3
According to the schematic diagram of the charging process of the ultrasonic sputtering liquid of the electret shown in figure 1, polar liquid is deionized water/ethanol mixed liquid with the mass ratio of deionized water to ethanol being 30:70, 5mm of a sheet material formed by mixing porous natural fibers and chemical fibers, the sheet material is subjected to corona treatment by a corona device at a linear speed of 50m/min through an unwinding device, enters a liquid tank filled with the deionized water/ethanol mixed liquid from the lower end of the bottom of a 45-degree inclined liquid tank, the distance between a first roller shaft made of quartz and the central line of a second roller shaft made of quartz is 1m, the vertical distance between the first roller shaft made of quartz and the bottom of the liquid tank is 5mm through adjusting the first roller shaft made of quartz and the second roller shaft made of quartz, so that the sheet material formed by mixing the porous natural fibers and the chemical fibers and 5mm of the plurality of layers below the second roller shaft made of quartz is attached to the bottom of the liquid tank, and meanwhile, applying ultrasonic waves with the power of 3000w to the bottom of a liquid tank filled with a 5mm multi-layer porous natural fiber and chemical fiber mixed sheet material soaked by the deionized water/ethanol mixed solution, wherein the ultrasonic waves act on the 5mm multi-layer porous natural fiber and chemical fiber mixed sheet material soaked by the deionized water/ethanol mixed solution to cause the deionized water/ethanol mixed solution to vibrate at high frequency, the deionized water/ethanol mixed solution vibrating at high frequency impacts the 5mm multi-layer porous natural fiber and chemical fiber mixed sheet material soaked by the deionized water/ethanol mixed solution, and when the 5mm multi-layer porous natural fiber and chemical fiber mixed sheet material comes out of the liquid tank, the sheet material is dried by a drying device, so that the electret with uniform and stable charging effect is obtained.
Claims (4)
1. The utility model provides an ultrasonic wave sputter liquid charging device of electret, includes unwinding unit, take-up device, liquid charging device and drying device in the electret liquid charges, its characterized in that: the liquid tank (3) in the charging device is in a trapezoid shape, the included angle between the tank bottom of the liquid tank (3) and the horizontal plane is 20-65 degrees, the two ends of the tank bottom of the liquid tank (3) are respectively provided with a first roller shaft (4) and a second roller shaft (5), the central lines of the first roller shaft (4) and the second roller shaft (5) are parallel to the tank bottom of the inclined liquid tank (3), the adjustable vertical height ranges of the first roller shaft (4) and the second roller shaft (5) from the tank bottom of the liquid tank (3) are 0.5-50 mm, the central distance between the first roller shaft (4) and the second roller shaft (5) is 0.5-2m, the side wall of the liquid tank is provided with a liquid outlet (6) and a liquid inlet (7), the liquid outlet (6) is positioned below the central horizontal line of the first roller shaft (4), the liquid inlet (7) is positioned above the central horizontal line of the second roller shaft (5), and an ultrasonic generator (8) with power of 500 plus 5000w is arranged below, a drying device (9) consisting of a microwave dryer is arranged between the liquid charging device and the winding device (10).
2. An ultrasonic sputtering liquid charging method for an electret, the charging method comprising: an electret material (11) enters a liquid tank (3) filled with polar liquid from the lower end of the bottom of the liquid tank (3) at a linear speed of 1-50m/min through an unwinding device (1), the electret material (11) firstly passes through the lower part of a first roller shaft (4) and then passes through the lower part of a second roller shaft (5), the electret material is attached to the bottom of the liquid tank (3) by adjusting the distance between the first roller shaft (4), the second roller shaft (5) and the bottom of the liquid tank (3), the liquid inlet (6) flows in the polar liquid at a speed of 5-30m/min, the polar liquid flows out from a liquid outlet (7), ultrasonic waves with a power of 500 plus 5000w are applied to the bottom of the liquid tank (3) filled with the electret material (11) soaked by the polar liquid, and the ultrasonic waves act on the electret material (11) soaked by the polar liquid at the bottom of the liquid tank (3) to cause high-frequency vibration of the polar liquid, the polar liquid vibrating at high frequency impacts the electret material (11) soaked by the polar liquid at the bottom of the liquid attaching groove (3), and when the electret material (11) comes out of the liquid groove (3), the electret material is dried by a drying device (9) to obtain the charged electret.
3. An ultrasonic sputtering liquid charging method for an electret according to claim 2, wherein the material (11) to be electret is a single-layer or multi-layer porous sheet material consisting of natural fibers or chemical fibers, or a mixture of natural fibers and chemical fibers.
4. The method of claim 2, wherein said polar liquid is deionized water or ethanol or a mixture thereof.
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| CN103069065A (en) * | 2010-07-07 | 2013-04-24 | 3M创新有限公司 | Patterned air-laid nonwoven electret fibrous webs and methods of making and using same |
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| NL160303C (en) * | 1974-03-25 | 1979-10-15 | Verto Nv | METHOD FOR MANUFACTURING A FIBER FILTER |
| CN1076392A (en) * | 1992-03-16 | 1993-09-22 | 汪立果 | Bismuth pin manufacturing process and equipment |
| US6969484B2 (en) * | 2001-06-18 | 2005-11-29 | Toray Industries, Inc. | Manufacturing method and device for electret processed product |
| CN101555665A (en) * | 2008-04-11 | 2009-10-14 | 冷博 | Identical reaction kettle reel-to-reel plasma ultrasonic supercritical non-aqueous dyeing |
| CN104197497B (en) * | 2014-09-02 | 2017-06-23 | 浙江金海环境技术股份有限公司 | Air filter and application thereof |
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| CN103069065A (en) * | 2010-07-07 | 2013-04-24 | 3M创新有限公司 | Patterned air-laid nonwoven electret fibrous webs and methods of making and using same |
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