CN1579596A - Fiber shaped body filtering material - Google Patents
Fiber shaped body filtering material Download PDFInfo
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- CN1579596A CN1579596A CN 200410037977 CN200410037977A CN1579596A CN 1579596 A CN1579596 A CN 1579596A CN 200410037977 CN200410037977 CN 200410037977 CN 200410037977 A CN200410037977 A CN 200410037977A CN 1579596 A CN1579596 A CN 1579596A
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- filtering material
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Abstract
The invention relates to a body filtration material of fibre forming. Belonging to water treatment field, it is used to separate kinds of impurities in water. It is composed by kernel and weaving layer which is directly weaved by fibre silk or made by putting fibre silk on base cloth. In an upright of curved column shape, the kernel surface is connected with weaving layer, fibre silk lies in kernel surface and the kernel is wrapped by fibre silk. Filtration material in the invention has a large surface area, high precision and big filth containing capacity. It has a long using life because fibre silk is uneasy to fallout. At the same time, it is easy to wash for avoiding entangle among fibre silks.
Description
Technical field
The present invention relates to a kind of fiber filter material, be used for the dried up various suspended impurities of branch,, belong to water-treatment technology field as solid suspension and grease etc.
Background technology
In fields such as drink water purifying, sewage disposal, desalinization, salt industry, aquaculture, industry water circulation, suspended particulate be an important process procedure separating of water.The filtering material that adopts in traditional filtering technique is a granule filter material, and as quartz sand, anthracite, ceramic bead etc., this filtrate is a particle shape, and specific area is little, and filtering accuracy is low, and the filter bed pollutant holding capability is little, and the rate of filtration is low.
Synthetic fiber filter material has been used in improvement to granule filter material, and purpose is to utilize specific fiber surface long-pending big, the adjustable characteristics of filter bed porosity.The method that initial stage adopts short-fibre silk to huddle forms filter bed, as Japanese kokai publication sho 56-152709, though this filtrate can remedy the defective that conventional particles media filtration precision is low, the filter bed pollutant holding capability is little, the rate of filtration is low, but because the difference in specific gravity of fiber and water is little, twine mutually between the filament simultaneously, so cleaning performance is poor, and during backwash fiber filtering easily with the backwash drainage loss.
For the defective of avoiding short fiber monofilament filtrate has proposed various fiberizing body filtrates.Adopt among the special fair 1-26726 of Japan and twine legal system spherical fiber filtrate in the liquid.The spy opens the method system spherical fiber filtrate of using crimpling fiber bundle center ligation among the clear 63-93312.Propose fibre bundle centre junction hypodesmus in China's utility model 85200039.1 and made the spherical fiber filtrate.The common trait of above-mentioned spherical filtrate is the symmetrical structure that filtrate is manufactured from the same material, because it is big near filtrate ball center place's fibre dense degree, so be difficult to during backwash clean thoroughly, the residue deposition amount of filter bed is big after the backwash, causes the filter tank capacity utilization low thus.In addition, because the filter bed fibre dense degree that spherical filtrate forms is inhomogeneous, the space between filtrate ball and the ball is big, and current are inhomogeneous when causing filtration, and filter bed reduces effluent quality variation under the high-rate fitration condition to the efficient of holding back of suspended particulate.
China's utility model 98249298.7 has proposed a kind of comet type fiber filter material of being made up of cometary nucleus and tail of a comet tow, this filtering material has overcome the defective of the inhomogeneous and filter bed backwash effect difference of spherical fiber filtering filter bed fibre dense degree, has the solid-liquid separation efficiency height, the advantage that backwash effect is good, but this filtrate one end is solid cometary nucleus, the other end is the loose fibres tow, this configuration has caused the fixing fiber number of each cometary nucleus less, correspondingly, in filter bed, account for big volume to filtering inoperative solid cometary nucleus, thereby the capacity utilization of filter bed is little.
Chinese invention patent application 00107758.9 has proposed a kind of filtering material that is made of fibre bundle and tow joint, it is big that this filtering material had both had the fibrous material specific area, the filtering accuracy height, the characteristics that the filter bed pollutant holding capability is big, have the high characteristics of granule filter material backwash wash degree again, simultaneously, this filtrate is made of the fibre bundle more than two strands or two strands, to account for the volume ratio of filtrate big for fiber in the filtrate, the filter bed that is formed by this filtrate can be given full play to the filtration of fiber, therefore, the capacity utilization height of filter bed, the filter tank volume is little.But, after long-term the use, when backwash, twine between silk in the filtrate monomer and the silk and between the tow of different monomers, make a lot of filtrates link bunchiness, thereby reduced the backwash wash degree, shortened the service life of filtrate.
Summary of the invention
At the deficiencies in the prior art and defective, the purpose of this invention is to provide the very alike fiberizing body filtering material of a kind of shape and caterpillar, make it have not only that specific area is big, filtering accuracy is high, advantages such as the filter bed pollutant holding capability is big, and on the filtrate filament to account for the volume ratio of filtrate big, be free from each other between filament and the filament, after long-term the use, filtrate does not fall silk, when backwash, be difficult for twining between silk in the filtrate monomer and the silk and between the tow of different monomers, thereby further improve the wash degree of backwash, prolong the service life of filtrate.
The objective of the invention is to be achieved through the following technical solutions:
A kind of fiberizing body filtering material is characterized in that: filtering material is worn the filametntary layer of knitting by kernel and and is constituted, described knit layer be by filament directly braiding form or filament be woven on the base cloth and form; Described kernel is right cylinder shape or crooked column, described be with filametntary knit the layer be bonded on the kernel, filament stands on core surface, kernel is coated by filament.
Filament of the present invention is that in natural fiber, staple fibre, synthetic fibers or the inorfil one or more mix.Filament can use fibers straight, crimped fibre or section fiber.
The layer of knitting of the present invention adopts a filament to be made into or filament is woven on the base cloth and forms, and filament is the 2-60 millimeter in the length of knitting on the layer.
Kernel of the present invention is a column, and cross section is circle, ellipse, triangle, rectangle or erose solid, hollow body or porous body, and the circumscribed circle diameter of cross section is 1～50 millimeter.
Kernel of the present invention is by macromolecular material, pottery, glass, rubber or metal right cylinder shape or crooked column, 1～100 millimeter of column length.
The present invention compares with filtering material in the past, has the following advantages and the high-lighting effect: to account for the volume ratio of filtrate big for filament on the filtering material of the present invention, and kernel is coated by filament, has improved filtering accuracy; Filament stands on core surface, is free from each other between filament and the filament, is easy to the flush away that comes off attached to the dirt on the filament, backwash wash degree height; Have the filametntary layer of knitting and be bonded on the kernel, increased the firm degree of filtrate, filtrate does not fall silk, can use for a long time.Filtering material of the present invention is used for filtering technique its distinctive advantage.Following is example to flowing through filtering method, the packing of filter bed from top to bottom increases gradually during filtration, correspondingly, the filter bed porosity from top to bottom diminishes gradually, therefore, the filter bed holding filth capacity is big, dirty precision height is cut in the filter bed bottom owing to filter bed is closely knit, make a filter bed retaining power and a section dirty precision increase substantially, simultaneously, the filter bed porosity from top to bottom diminishes gradually and makes that also the filter bed hydraulic resistance is little, and the rate of filtration in filter tank increases substantially.During backwash, particularly during the air-flow backwash, the bubble that is risen by the bottom increases gradually, at the active force of top, filter tank bubble minute bubbles greater than the bottom, filter tank, because the holding filth capacity of filter bed top filtrate is big, the bigger active force that is subjected to top, filter tank adapts, and has realized for dirtier filtrate, corresponding cleaning intensity is also big, has consequently saved the water consumption of the power consumption and the backwash of backwash.Another characteristics of filtering material of the present invention are that the shared volume ratio of fiber is big in the filter bed, thereby filter bed capacity utilization height, have effectively utilized the filter tank volume more.
Description of drawings
Fig. 1 a, Fig. 1 b, Fig. 1 c, Fig. 1 d are the contour structures schematic diagram of filtering material of the present invention.
Fig. 2 a, Fig. 2 b, Fig. 2 c, Fig. 2 d are the cross sectional representation of filtering material of the present invention.
Fig. 3 a, Fig. 3 b are that filtering material of the present invention is respectively applied for and filters and the operation schematic diagram during the filter bed backwash.
The specific embodiment
Fig. 1 a, Fig. 1 b, Fig. 1 c, Fig. 1 d are the contour structures schematic diagram of filtering material of the present invention.This filtering material is had by one side filametntaryly knits layer 1 and kernel 2 constitutes, and does not form similar caterpillar shape with the surface (surface comprises side and two end faces) that filametntary one side is not bonded in kernel 2 with knitting layer 1.Filament is natural fiber, staple fibre, synthetic fibers or inorfil, as filaments such as cotton fiber, glass fibre, terylene, polyamide fibre, acrylic fibers.Filament can be with in the above-mentioned fiber a kind of, also can be by two or more the mixing in the above-mentioned fiber.Filament can use fibers straight, crimped fibre or section fiber.Fibre single thread diameter 5-200 micron.Have filametntary knit layer 1 by filament directly braiding form or filament be woven on the base cloth and form, the filament length of knitting on the layer 1 is the 2-60 millimeter.Kernel 2 is by macromolecular material, pottery, glass, rubber or metal right cylinder shape (Fig. 1 a) or crooked column (Fig. 1 b, Fig. 1 c, Fig. 1 d), column length 1-100 millimeter.
Among Fig. 2, the cross section of the kernel 2 of filtering material of the present invention be circular (Fig. 2 a), oval (Fig. 2 b), triangle (Fig. 2 c), rectangle (Fig. 2 d) or irregularly shaped, kernel 2 be solid (Fig. 2 a), solid (Fig. 2 b), hollow body (Fig. 2 d) or the porous body (Fig. 2 c) of powder filler material.
Below with under the filter tank to flowing through filtration and the back-flushing operation situation that filtering method is an example explanation filtrate of the present invention.
Situation when filtering material of the present invention is used to filter is shown in Fig. 3 (a).Be filtered liquid and flow to filter tank 6 from water inlet pipe 8, after filter bed 5 filtrations via the filtrate composition, discharge from outlet pipe 11, filter bed 5 is blocked by orifice plate 4, runs off in order to avoid filtrate enters in the water outlet.Filtrate is compressed in part of filter during filtration, the porosity of the filter bed that is made of a large amount of filtrates from top to bottom reduces gradually, various dirts are attached on the filtrate filament in the water, make that the water outlet of outlet pipe 11 is limpid, the ratio that accounts for the filtrate volume owing to filament on the filtrate is big, thereby improved filametntary utilization rate in the filter bed, increased the pollutant holding capability of filter bed.
Situation during filtering material filter bed backwash of the present invention is shown in Fig. 3 (b).When adopting air-water associating backwash, backwashing water enters the filter tank from backwash water inlet pipe 3, and air enters the filter tank by air hose 10, and the backwash draining is discharged by discharge outlet 9, and the effect of up-hole plate 7 is to prevent that filtrate runs off with the backwash current.Under the effect of recoil current or bubble, filter bed expands, the filtrate come-up, filtrate is loose condition (of surface) in water, owing to be free from each other between filament and the filament on the filtrate, under the effect of current and bubble, the dirt that adheres on the filtrate filament comes off rapidly, cleans purpose completely thereby reach filtrate.
These characteristics will further be illustrated in an embodiment.
Filament diameter is 25 microns polyster fibre and each composite fibre silk of 50% of acrylic fiber adopts weave to make one side to have the filametntary layer of knitting, filament is 10 millimeters in the length of knitting on the layer.Kernel is made the cylinder of 5 millimeters of column lengths, 3 millimeters of cross-sectional diameters by the epoxy resin that adds ceramic powders and metal dust.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
A plurality of filtrates are put into the filter tank form filter bed.1.5 meters of filter tank diameters, filter bed is high 800 millimeters, and the filter tank is high 4.4 meters, and operation result sees the following form.This table has provided the operation result of fiber-ball filter media, comet type fiber filtering simultaneously.
| Filtrate | Filtrate of the present invention | Fiber-ball filter media | The comet type | |
| Specification | ||||
| 3 millimeters kernel posts of nuclear cross section circular diameter are high 5 millimeters in 10 millimeters of the fibre single thread diameter 25 micrometer fibers filament length degree | 35 millimeters of 40-50 microns filtrate bulb diameters of fibre single thread diameter 30- | 2.5 millimeters of 1.2 millimeters cometary nucleus diameters of the long 35 millimeters tow diameters of fibre single thread diameter 50 micrometer fibers tow | ||
| Filter | Filtering velocity (rice/hour) water inlet concentration of suspension (mg/litre) water outlet concentration of suspension (mg/litre) | ????45-50 ????15-35 ????0.05-0.5 | ??25-35 ??15-35 ??0.8-1.5 | ????35-40 ????15-35 ????0.5-1.2 |
| Backwash | Water consumption rate (%) residue deposition rate (%) | ????0.6-1.2 ????0.1-0.2 | ??1.2-2.2 ??5-18 | ????1.0-1.5 ????0.4-0.6 |
Embodiment 2
The acrylic fiber silk employing weave of 40 microns of filament diameters is made one side have the filametntary layer of knitting, filament is 5 millimeters in the length of knitting on the layer.Kernel is made the crooked column of L type of 12 millimeters of column lengths by polypropylene plastics, and the cross section of column is the dumb-bell shape of 5 millimeters of circumscribed circle diameters.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.A plurality of filtrates are put into the filter tank form filter bed, filter tank size and filter bed height are with embodiment 1, and operation result is as follows:
Filtering velocity (rice/hour) 45-50
Water inlet concentration of suspension (mg/litre) 15-30
Water outlet concentration of suspension (mg/litre) 0.05-0.5
Backwash water consumption rate (%)＜0.5
Residue deposition rate (%) 0.1-0.2
With the monofilament silk directly is that each composite fibre silks of 50% of ramee of 180 microns sisal fiber and 15 microns adopts weave to make one side to have the filametntary layer of knitting, and filament is 50 millimeters in the length of knitting on the layer.Kernel is made the cylinder of 25 millimeters of column lengths, 8 millimeters of cross-sectional diameters by igelite.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
With the monofilament silk directly is that each composite fibre silks of 50% of acrylic fiber silk of 20 microns and 40 microns adopts weave to make one side to have the filametntary layer of knitting, and filament is 20 millimeters in the length of knitting on the layer.Kernel is made the crooked column of S type of 20 millimeters of column lengths by the unsaturated polyester resin that adds ceramic powders, and cross section is the ellipse of 5 millimeters of circumscribed circle diameters.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
With the monofilament silk directly is that each composite fibre silk of 50% of acrylic fiber silk in 40 microns in 20 microns polyster fibre and monofilament silk footpath adopts weave to make one side to have the filametntary layer of knitting, filament is 5 millimeters of polyster fibre silks in the length of knitting on the layer, 15 millimeters of acrylics filaments.Kernel is made the column of 10 millimeters of column lengths by neoprene, and cross section is the square of 6 millimeters of the length of sides.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
The monofilament silk directly is 30 microns, and section is that the special-shaped section polyster fibre silk of trilobal cross adopts weave to make one side to have the filametntary layer of knitting, and filament is 50 millimeters in the length of knitting on the layer.Kernel is made the cylinder of 10 millimeters of column lengths, 10 millimeters of cross-sectional diameters by vinyon.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
With the monofilament silk directly is that 120 microns polypropylene crimped fibre silk adopts weave to make one side to have the filametntary layer of knitting, and filament is 30 millimeters in the stretching length of knitting on the layer.Kernel is made the column of 8 millimeters of column lengths by level metal rectangular pipe, and cross section is the rectangle of 8 millimeters of circumscribed circle diameters.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
With the monofilament silk directly is that 25 microns viscose rayon silk adopts weave to make one side to have the filametntary layer of knitting, and filament is 12 millimeters in the length of knitting on the layer.Kernel is made the porous cylindrical body of 6 millimeters of column lengths, 6 millimeters of cross-sectional diameters by the epoxy resin that adds hollow glass micropearl.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Embodiment 9
With the monofilament silk directly is that 25 microns viscose rayon silk adopts weave to be woven on the chemical fibre base cloth, makes one side and has the filametntary layer of knitting, and filament is 10 millimeters in the length of knitting on the layer.Kernel is made the cylinder of 4 millimeters of column lengths, 4 millimeters of cross-sectional diameters by the epoxy resin that adds metal dust.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Adopt weave to be woven on the cotton viscose rayon silk in 25 microns in monofilament silk footpath, make one side and have the filametntary layer of knitting, filament is 10 millimeters in the length of knitting on the layer.Kernel is made the round platform column of 10 millimeters of column lengths by the epoxy resin that adds ceramic powders, and the cross section of round platform column is 4 millimeters of end diameters, 8 millimeters of other end diameters.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Adopt weave to be woven on the glass fibre base cloth glass fiber in 8 microns in monofilament silk footpath, make one side and have the filametntary layer of knitting, filament is 3 millimeters in the length of knitting on the layer.Kernel is made the cylinder of 5 millimeters of column lengths, 2 millimeters of cross-sectional diameters by glass.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Embodiment 12
The nylon fibre 20% in 20 microns in monofilament silk footpath is made one side with the composite fibre silk employing weave of the polyster fibre 80% in 20 microns in monofilament silk footpath have the filametntary layer of knitting, filament is 30 millimeters in the length of knitting on the layer.Kernel is made the cylinder of 12 millimeters of column lengths, 12 millimeters of cross-sectional diameters by vinyon.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Embodiment 13
Directly be that the composite fibre silk of 20 microns nylon fibre 40% and the acrylic fiber 60% in 20 microns in monofilament silk footpath adopts weave to make one side to have the filametntary layer of knitting with the monofilament silk, filament is 5 millimeters on polyamide fibre, 15 millimeters of acrylic fibers in the length of knitting on the layer.Kernel is made the cylinder of 2 millimeters of column lengths, 2 millimeters of cross-sectional diameters by polypropylene plastics.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Embodiment 14
The wool fiber silk employing weave in 25 microns in monofilament silk footpath is made one side have the filametntary layer of knitting, filament is that the 2-10 millimeter does not wait in the length of knitting on the layer.Kernel is made the cylinder of 5 millimeters of column lengths, 5 millimeters of cross-sectional diameters by polyethylene.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Embodiment 15
Directly be that composite fibre silk that the acrylic fiber 60% in 25 microns in 20 microns the nylon fibre 20% in 20 microns in polyster fibre 20%, monofilament silk footpath and monofilament silk footpath mixes adopts weave to make one side to have the filametntary layer of knitting with the monofilament silk, filament is 12 millimeters in the length of knitting on the layer.Kernel is made the cylinder of 4 millimeters of column lengths, 4 millimeters of cross-sectional diameters by the epoxy resin that adds metal dust.Be not bonded on the surface of kernel knitting layer, make filtering material of the present invention with filametntary one side.
Claims (6)
1. fiberizing body filtering material is characterized in that: filtering material has the filametntary layer of knitting by kernel and one side and constitutes, described knit layer be by filament directly braiding form or filament be woven on the base cloth and form; Described kernel is right cylinder shape or crooked column, and its core surface bonds together with knitting layer, and filament stands on core surface, and kernel is coated by filament.
2. filtering material according to claim 1 is characterized in that: described filament is that in natural fiber, staple fibre, synthetic fibers or the inorfil one or more mix.
3. filtering material according to claim 2 is characterized in that: described filament uses fibers straight, crimped fibre or section fiber.
4. according to claim 1,2 or 3 described filtering materials, it is characterized in that: described filament is 2～60 millimeters in the length of knitting on the layer.
5. filtering material according to claim 1 is characterized in that: the cross section of described kernel is circle, ellipse, triangle, rectangle or erose solid, hollow body or porous body, and the circumscribed circle diameter of cross section is 1～50 millimeter.
6. filtering material according to claim 1 or 5, it is characterized in that: described kernel is for to be made by macromolecular material, pottery, glass, rubber or metal material, and its column length is 1～100 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037977 CN1579596A (en) | 2004-05-18 | 2004-05-18 | Fiber shaped body filtering material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037977 CN1579596A (en) | 2004-05-18 | 2004-05-18 | Fiber shaped body filtering material |
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| CN1579596A true CN1579596A (en) | 2005-02-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101884860A (en) * | 2010-06-29 | 2010-11-17 | 新疆德安环保科技有限公司 | Butterfly high-efficiency self-adaptive plastic-fiber mixed filter material filter |
| CN102728160A (en) * | 2012-07-12 | 2012-10-17 | 袁野 | Device and method for three-dimensional gas filtration |
| CN103223276A (en) * | 2013-04-27 | 2013-07-31 | 陈银轩 | Water mist cleaning apparatus for high voltage impulse power generation apparatus |
| CN103623641A (en) * | 2012-08-22 | 2014-03-12 | 杨志江 | Filtering material made from fiber tows and hollow tow knots |
| CN104307220A (en) * | 2014-10-27 | 2015-01-28 | 苏州新协力环保科技有限公司 | Fiber ball filtering material |
| CN106870065A (en) * | 2017-03-31 | 2017-06-20 | 蚌埠市风驰滤清器有限公司 | A kind of high life oil filter |
| CN111072136A (en) * | 2019-12-30 | 2020-04-28 | 南京公诚节能新材料研究院有限公司 | Composite biological filter material for biological aerated filter |
| CN112546685A (en) * | 2020-11-09 | 2021-03-26 | 黄河勘测规划设计研究院有限公司 | High-efficiency filter material and suspension filter system using same |
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2004
- 2004-05-18 CN CN 200410037977 patent/CN1579596A/en active Pending
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| CN101884860A (en) * | 2010-06-29 | 2010-11-17 | 新疆德安环保科技有限公司 | Butterfly high-efficiency self-adaptive plastic-fiber mixed filter material filter |
| CN101884860B (en) * | 2010-06-29 | 2012-07-04 | 新疆德安环保科技有限公司 | Butterfly high-efficiency self-adaptive plastic-fiber mixed filter material filter |
| CN102728160A (en) * | 2012-07-12 | 2012-10-17 | 袁野 | Device and method for three-dimensional gas filtration |
| CN103623641A (en) * | 2012-08-22 | 2014-03-12 | 杨志江 | Filtering material made from fiber tows and hollow tow knots |
| CN103223276A (en) * | 2013-04-27 | 2013-07-31 | 陈银轩 | Water mist cleaning apparatus for high voltage impulse power generation apparatus |
| CN104307220A (en) * | 2014-10-27 | 2015-01-28 | 苏州新协力环保科技有限公司 | Fiber ball filtering material |
| CN104307220B (en) * | 2014-10-27 | 2015-10-14 | 苏州新协力环保科技有限公司 | A kind of fiber-ball filter media |
| CN106870065A (en) * | 2017-03-31 | 2017-06-20 | 蚌埠市风驰滤清器有限公司 | A kind of high life oil filter |
| CN111072136A (en) * | 2019-12-30 | 2020-04-28 | 南京公诚节能新材料研究院有限公司 | Composite biological filter material for biological aerated filter |
| CN111072136B (en) * | 2019-12-30 | 2022-04-01 | 南京公诚节能新材料研究院有限公司 | Composite biological filter material for biological aerated filter |
| CN112546685A (en) * | 2020-11-09 | 2021-03-26 | 黄河勘测规划设计研究院有限公司 | High-efficiency filter material and suspension filter system using same |
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