CN216537493U - Cylindrical filter element - Google Patents
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- CN216537493U CN216537493U CN202220077398.9U CN202220077398U CN216537493U CN 216537493 U CN216537493 U CN 216537493U CN 202220077398 U CN202220077398 U CN 202220077398U CN 216537493 U CN216537493 U CN 216537493U
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Abstract
The utility model discloses a cylindrical filter element, which at least comprises a non-woven fabric filter layer (2), wherein the cross section of the non-woven fabric filter layer (2) is of an intaglio structure, the thickness of the intaglio is 0.10-0.32 mm, and the thickness of the embossed is 0.55-0.80 mm. The cylindrical filter element has the characteristics of high rigidity and softness and high air permeability. The cylindrical filter element can be applied to the field of indoor and automobile air filters, dust collectors and coating line filtration.
Description
Technical Field
The utility model relates to a cylindrical filter element.
Background
At present, the filter core for industrial dust removal field adopts spunbonded nonwoven to support the material mostly, and the surface does not have the raised grain structure, when using in high temperature environment, nonwoven supports the material and warp easily, is unfavorable for the stable in shape of filter core, and because the supporting layer warp, will lead to taking place the separation with the PTFE membrane or the PVDF membrane of filter layer, and the fold department of filter core warp easily and pile up the dust for the filter core pressure loss increases, and filtering quality reduces.
For example, chinese patent publication CN108636844A discloses a nonwoven dust-removing material and a method for making the same, wherein the nonwoven fabric substrate and a viscous material attached to the surface of the nonwoven fabric substrate are provided with regularly arranged protrusions or holes on the surface of the nonwoven fabric substrate, but the nonwoven fabric support material has low stiffness and is easily deformed at high temperature and separated from the filter layer, so that the nonwoven fabric filter material has poor air permeability, increased pressure loss, reduced filtration efficiency, and shortened service life.
Disclosure of Invention
The utility model aims to provide a cylindrical filter element with high rigidity and high air permeability.
The cylindrical filter element at least comprises a non-woven fabric filter layer 2, wherein the cross section of the non-woven fabric filter layer 2 is of an uneven structure, the thickness of the uneven structure is 0.10-0.32 mm, and the thickness of the uneven structure is 0.55-0.80 mm.
The cylindrical filter element of the utility model preferably comprises a support layer 1, an upper end cap 3 and a lower end cap 4.
The concave patterns are preferably arranged in a straight line, and the convex patterns are preferably arranged in a diagonal line.
The distance between the adjacent ridges and the grooves is preferably 0.50-1.30 mm.
The ratio of the area of the concave portion in each square meter is preferably 7-20%.
The length of the concave grains is preferably 2.00-8.00 mm.
The material of the nonwoven fabric filter layer 2 is preferably polypropylene or polyester.
The non-woven fabric filter layer 2 is preferably of a pleated structure, and the height of the pleat is preferably 3.00-6.00 cm.
The distance between two adjacent peaks of the pleat is preferably 0.50-3.00 cm.
The utility model has the beneficial effects that: the surface of the non-woven fabric filter layer in the cylindrical filter element has concave-convex stripes, so that the cylindrical filter element has the characteristics of high rigidity and high air permeability, and can be applied to the field of indoor and automobile air filters, dust collectors and coating line filtration.
Drawings
Fig. 1 is a schematic view of an appearance structure of a cylindrical filter element according to the present invention. In the figure, 1 is a supporting layer, 2 is a non-woven fabric filtering layer, 3 is an upper end cover, and 4 is a lower end cover.
Detailed Description
The cylindrical filter element at least comprises a non-woven fabric filter layer 2, wherein the cross section of the non-woven fabric filter layer 2 is of an uneven structure, the thickness of the uneven structure is 0.10-0.32 mm, and the thickness of the uneven structure is 0.55-0.80 mm. The thickness of the concave veins refers to the thickness of the concave parts of the non-woven fabric, and the thickness of the convex veins refers to the thickness of the convex parts of the non-woven fabric. The surface of the non-woven fabric is of the concavo-convex structure, the rigidity of the filter material and the shape stability of the material are ensured through the concavo-convex structure, and the non-woven fabric is not easy to deform and ensures the filtering performance of the filter material in the actual use process. The thickness of the concave lines and the thickness of the convex lines are controlled within a certain range, if the thickness of the concave lines is less than 0.10mm, the pressing part is pressed excessively, so that the material is easily embrittled, and the material is broken during the wrinkle processing; if the thickness of the concave veins is higher than 0.32mm, the pressing of the filter material is too weak, so that the filter material is easy to delaminate, which is not beneficial to the stability of the material. If the thickness of the ribs is less than 0.55mm, the air permeability of the material is affected, so that the pressure loss is increased and the service life is reduced in the actual use process; if the thickness of the ribs is more than 0.80mm, although the air permeability of the material is improved, the filtering performance is reduced, and the high-efficiency filtering effect is not achieved.
The cylindrical filter element preferably comprises a supporting layer 1, an upper end cover 3 and a lower end cover 4, wherein the supporting layer 1 is made of porous stainless steel, and plays a supporting role on a non-woven fabric filter layer, so that the filter layer is effectively prevented from deforming after receiving pressure. The upper end cover 3 and the lower end cover 4 are made of stainless steel materials, are connected with the supporting layer 1, and are fixed at two ends of the filtering material through the upper end cover, and are combined with the inner supporting layer, so that the stability of the filter element is greatly enhanced, and the stability of the shape of the filter element is further ensured.
The concave patterns are preferably arranged in a straight line, and the convex patterns are preferably arranged in a diagonal line. Through the linear arrangement of concave lines and the oblique line type arrangement of convex lines, the concave-convex lines on the surface are of a crossed structure, thereby being more favorable for the stability of the shape of the filter material.
The distance between the adjacent convex patterns and the concave patterns is preferably 0.50-1.30 mm, the distance between the adjacent convex patterns and the concave patterns is a straight line distance from the center of the pattern to the center of the pattern, if the distance between the adjacent convex patterns and the concave patterns is too small, the concave-convex embossing area ratio is increased, the filtering area of the filtering material is reduced, the filtering burden of the filtering material is increased in the actual use process, and the service life is shortened; if the distance between the adjacent convex and concave lines is too large, the concave line area ratio of the pressing part for bonding and fixing is reduced, thereby reducing the rigidity of the material and reducing the rigidity and softness of the material, and during the actual use, the rigidity and softness of the filter material are lower than 4500mN, thus easily causing deformation and reducing the service life.
The proportion of the area of the concave groove part in each square meter is preferably 7-20%, if the proportion of the area of the concave groove part in each square meter is too large, the air permeability of the obtained filter material is reduced, the filter pressure loss is increased, and the energy consumption is increased in the actual use process; if the proportion of the area of the concave groove part in each square meter is too small, the rigidity of the obtained filter material is small, which is not beneficial to the shape maintenance of the filter, thereby reducing the service life. Considering the air permeability and the stiffness of the filter material, the ratio of the area of the concave portion per square meter is more preferably 8 to 14%.
The length of the concave lines is preferably 2.00-8.00 mm, if the length of the concave lines is too long, the rigidity of the material is increased, but the non-embossed filtering area is reduced; if the length of the concave grains is too short, the length and the area of the concave grains are not enough to ensure the rigidity of the filter material, and the shape maintenance of the filter is influenced. Considering the air permeability and the stiffness of the filter material, the length of the concave grains is more preferably 4.00-6.00 mm.
The material of the nonwoven fabric filter layer 2 of the present invention is preferably polypropylene or polyester, and the nonwoven fabric filter layer 2 may have a one-layer structure or two or more-layer structure. When the filter material is of a one-layer structure, the non-woven fabric filter layer is a spun-bonded non-woven fabric which is formed by one or two of polypropylene and polyester, and the polypropylene and the polyester have higher softening temperature and melting point, good heat resistance, higher strength and modulus, better elasticity, wear resistance and impact resistance, good creep resistance under load and aging resistance. The non-woven fabric is prepared by adopting a spun-bonded process, specifically, after a polymer is extruded and stretched to form continuous filaments, the filaments are laid into a net, and the net is subjected to self-bonding, thermal bonding, chemical bonding or mechanical reinforcement to prepare the spun-bonded non-woven fabric. Because the spun-bonded non-woven fabric is composed of continuous filaments, the filaments are drafted and cooled by high-speed airflow to form a fiber web, and the fiber web has higher orientation degree and crystallinity. Therefore, the spunbonded nonwoven fabric has high breaking strength and low elongation at break, and also has high bending strength.
The non-woven fabric filter layer 2 is preferably of a pleated structure, the height of the pleat is preferably 3.00-6.00 cm, the peak distance is 0.50-3.00 cm, and the shape of the filter element is not favorably maintained if the height of the pleat is too high; if the height of the pleat is too low, although the shape of the filter element is stable, the filtering area is greatly reduced, and the filtering wind speed is increased under the same filtering wind quantity condition, so that the service life of the filter element is reduced. In consideration of the shape stability and the service life of the filter element, the height of the pleats is more preferably 3.50-5.00 cm.
The distance between two adjacent pleated peaks is preferably 0.50-3.00 cm, and on the premise of the same pleated height, if the distance between two adjacent pleated peaks is too large, the filtering area is reduced, so that the filtering efficiency of the filter element is reduced; if the distance between two adjacent pleated peaks is too small, the pressure loss of the filter element is increased, and the ash removal is not facilitated. In consideration of the filtration efficiency and the pressure loss of the filter element, the distance between two adjacent pleated peaks is more preferably 2.00-3.00 cm.
The cylindrical filter element can ensure a certain degree of ventilation and rigidity, is not easy to deform in a high-temperature environment, overcomes the defects of easy deformation at present, so that the non-woven fabric filter material has poor ventilation, increased pressure loss, reduced filtration efficiency, shortened service life and the like, and can thermally press a layer of PTFE (polytetrafluoroethylene) membrane or PVDF (polyvinylidene fluoride) membrane on the non-woven fabric filter layer in order to ensure higher trapping efficiency of the filter element. Because the PTFE membrane or PVDF membrane has the characteristics of good chemical stability, small friction coefficient, high temperature resistance and the like, the prepared membrane has more micropores and small pore diameter, and compared with the existing product, the PTFE membrane or PVDF membrane has the characteristics of higher dust removal efficiency, no influence of particle size distribution, easy dust removal through surface filtration, low and stable dust removal resistance, good air permeability and long service life.
The present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to these examples, and the methods for testing the physical properties of the cylindrical filter element of the present invention are as follows.
[ thickness of relief ]
The thickness of the concave lines refers to the thickness of the concave parts of the non-woven fabric filter layer, and the thickness of the convex lines refers to the thickness of the convex parts of the non-woven fabric filter layer. The method comprises the steps of firstly taking 10mm multiplied by 10mm in size and 10 in total, then adopting an electronic scanning microscope to shoot the thickness of a concave part and a convex part at one random position on the surface of each sample, wherein the shooting multiplying power is 50 times, calculating the thickness of the concave-convex line of each sample, and finally taking the average value of 10 results as the thickness of the concave line and the thickness of the convex line.
[ spacing between adjacent grooves and ridges ]
The distance between the concave grains and the convex grains is the linear distance from the outer edge of the concave grain to the outer edge of the adjacent convex grain, shooting is carried out by adopting an electronic scanning microscope, the shooting magnification is 50 times, the linear distances from 10 of the linear distances perpendicular to the outer edges of the concave grains to the outer edges of the adjacent convex grains are measured, and then the average value of 10 results is taken, namely the distance between the concave grains and the convex grains.
[ ratio of concave area ]
The proportion of the area of the concave part is the percentage of the area of the concave part in each square meter, the sample is firstly cut into squares with the test area of 200mm multiplied by 200mm, the total number of the squares is 5, then an electron scanning microscope is adopted, the number of the concave parts in the area is respectively counted out with the shooting magnification of 50 times, and the area of a single concave part is calculated. The ratio of the area of the concave portion was obtained by the following calculation formula, and the average value of 5 calculations was taken. The calculation formula is as follows:
recess area ratio = (recess area × number of dimples)/test area × 100%.
Length of concave lines
And (3) shooting by adopting an electronic scanning microscope with the shooting magnification of 50 times, measuring the lengths of 10 embossed patterns, and then taking the average value of 10 results, namely the length of the concave pattern.
[ height of fold ]
The height of the pleats refers to the shortest straight line distance from the pleat to the adjacent pleat, the test method paves the non-woven fabric filter material, the distance between the adjacent pleats is measured 10 times by a ruler, and the average value is the height of the pleats.
[ spacing between two adjacent peaks ]
The distance between two adjacent peaks is measured by placing the filter element horizontally, measuring the distance between the peaks of the adjacent pleated structures, namely the shortest distance perpendicular to the pleated structures, 10 times, and taking the average value, namely the distance between the two peaks.
[ gram weight ]
The filter element was cut into a 200mm × 200mm square, the grammage of the filter element was calculated from the weight, the grammage was measured 3 times, and the final result was averaged over the 3 times.
[ degree of aeration ]
Based on JIS L1096 standard, the method for testing the air permeability of Frazier type fabric is adopted, 30 points are randomly selected to measure the air permeability of the filter element, and the average value is obtained.
[ degree of rigidity & softness ]
Based on JIS L-1096, 5 test specimens were measured in each of the warp and weft directions by a grid force type textile stiffness tester, and the average value of the results was obtained.
[ trapping efficiency ]
The collection efficiency of the filter element was measured based on a filter collection efficiency test method specified in JIS B9908 standard.
Example 1
Extruding and stretching polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by using a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a linear mode, the convex textures are arranged in a diagonal mode, the measured thickness of the concave textures is 0.10mm, the thickness of the convex textures is 0.55mm, the distance between the adjacent convex textures and the concave textures is 0.50mm, the proportion of the area of the concave texture part in each square meter is 7%, and the length of the concave textures is 2.00 mm. Then pleating the spun-bonded non-woven fabric by a pleating and setting machine, carrying out heat setting treatment at the temperature of 140 ℃, cooling, covering the surface of the spun-bonded non-woven fabric with the pleated height of 3.00cm and the distance between two peaks of 0.50cm with porous stainless steel, and finally preparing the cylindrical filter element.
Example 2
Extruding and stretching polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by using a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a linear mode, the convex textures are arranged in a diagonal mode, the measured thickness of the concave textures is 0.18mm, the thickness of the convex textures is 0.65mm, the distance between the adjacent convex textures and the concave textures is 0.75mm, the proportion of the area of the concave texture part in each square meter is 10%, and the length of the concave textures is 3.50 mm. And then pleating the spun-bonded non-woven fabric by a pleating setting machine, carrying out heat setting treatment at the temperature of 140 ℃, cooling, and then covering the surface of the spun-bonded non-woven fabric with the pleated height of 3.60cm and the distance between two peaks of 1.50cm by porous stainless steel to finally obtain the cylindrical filter element.
Example 3
Extruding and stretching polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by using a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a straight line way, and the convex textures are oblique linesAnd (3) carrying out formula arrangement, wherein the measured thickness of the concave lines is 0.25mm, the thickness of the convex lines is 0.70mm, the distance between every two adjacent convex lines is 0.95mm, the proportion of the area of the concave line part in each square meter is 14%, and the length of the concave line is 5.00 mm. Then pleating the spun-bonded non-woven fabric by a pleating and setting machine, then carrying out heat setting treatment at the temperature of 140 ℃, then carrying out cooling treatment, then covering porous stainless steel on the surface of the spun-bonded non-woven fabric with the pleat height of 4.20cm and the distance between two peaks of 2.00cm to prepare a cylinder, and then respectively arranging an upper end cover and a lower end cover on the upper part and the lower part of the cylinder to finally prepare the cylinder type filter element.
Example 4
Extruding and stretching polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by using a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a linear mode, the convex textures are arranged in a diagonal mode, the measured thickness of the concave textures is 0.28mm, the thickness of the convex textures is 0.75mm, the distance between the adjacent convex textures and the concave textures is 1.10mm, the proportion of the area of the concave texture part in each square meter is 18%, and the length of the concave textures is 6.50 mm. Then pleating the spun-bonded non-woven fabric by a pleating and setting machine, carrying out heat setting treatment at the temperature of 140 ℃, cooling, covering the surface of the spun-bonded non-woven fabric with the pleated height of 4.80cm and the distance between two peaks of 2.50cm with porous stainless steel, and finally preparing the cylindrical filter element.
Example 5
Extruding and stretching polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by using a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a linear mode, the convex textures are arranged in a diagonal mode, the measured thickness of the concave textures is 0.32mm, the thickness of the convex textures is 0.80mm, the distance between the adjacent convex textures and the concave textures is 1.30mm, the proportion of the area of the concave texture part in each square meter is 20%, and the length of the concave textures is 8.00 mm. Then the spun-bonded non-woven fabric passes through a pleating and setting machinePleating, heat setting at 140 deg.c, cooling, covering with porous stainless steel on the surface of spun-bonded non-woven fabric with pleat height of 6.00cm and interval between two peaks of 3.00cm to obtain the cylindrical filter core of the present invention.
Example 6
Extruding and stretching polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by using a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex grain structure, the concave grains are arranged in a linear mode, the convex grains are arranged in a diagonal mode, the measured thickness of the concave grains is 0.25mm, the thickness of the convex grains is 0.70mm, the distance between every two adjacent convex grains is 1.35mm, the proportion of the area of the concave grain part in each square meter is 14%, and the length of the concave grain is 10.00 mm. Then pleating the spun-bonded non-woven fabric by a pleating and setting machine, then carrying out heat setting treatment at the temperature of 140 ℃, then carrying out cooling treatment, then covering porous stainless steel on the surface of the spun-bonded non-woven fabric with the pleat height of 4.20cm and the distance between two peaks of 2.00cm to prepare a cylinder, and then respectively arranging an upper end cover and a lower end cover on the upper part and the lower part of the cylinder to finally prepare the cylinder type filter element.
Example 7
Extruding and stretching a polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a linear mode, the convex textures are arranged in a diagonal mode, the measured thickness of the concave textures is 0.25mm, the thickness of the convex textures is 0.70mm, the distance between the adjacent convex textures and the concave textures is 0.95mm, the proportion of the area of the concave texture part in each square meter is 22%, and the length of the concave textures is 5.00 mm. Then pleating the spun-bonded non-woven fabric by a pleating and setting machine, performing heat setting treatment at 140 ℃, performing cooling treatment, covering the surface of the spun-bonded non-woven fabric with pleat height of 4.20cm and interval between two peaks of 2.00cm with porous stainless steel to form a cylinder, and arranging the upper part and the lower part of the cylinder respectivelyAnd the upper end cover and the lower end cover are used for preparing the cylindrical filter element.
Comparative example 1
Extruding and stretching a polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a linear mode, the convex textures are arranged in a diagonal mode, the measured thickness of the concave textures is 0.08mm, the thickness of the convex textures is 0.52mm, the distance between the adjacent convex textures and the concave textures is 0.50mm, the proportion of the area of the concave texture part in each square meter is 7%, and the length of the concave textures is 1.60 mm. Then pleating the spun-bonded non-woven fabric by a pleating and setting machine, carrying out heat setting treatment at the temperature of 140 ℃, cooling, covering the surface of the spun-bonded non-woven fabric with the pleated height of 3.00cm and the distance between two peaks of 0.50cm with porous stainless steel, and finally preparing the cylindrical filter element.
Comparative example 2
Extruding and stretching polypropylene polymer by adopting a spun-bonding process to form continuous filaments, laying the filaments into a net, and reinforcing the net by using a compression roller to obtain the polypropylene fiber with the gram weight of 260g/m2The spunbonded nonwoven fabric is used as a filter layer, the surface of the filter layer is of a concave-convex texture structure, the concave textures are arranged in a linear mode, the convex textures are arranged in a diagonal mode, the measured thickness of the concave textures is 0.34mm, the thickness of the convex textures is 0.82mm, the distance between the adjacent convex textures and the concave textures is 0.50mm, the proportion of the area of the concave texture part in each square meter is 7%, and the length of the concave textures is 8.50 mm. Then pleating the spun-bonded non-woven fabric by a pleating and setting machine, carrying out heat setting treatment at the temperature of 140 ℃, cooling, covering the surface of the spun-bonded non-woven fabric with the pleated height of 6.50cm and the distance between two peaks of 3.50cm with porous stainless steel, and finally obtaining the cylindrical filter element.
TABLE 1
TABLE 2
According to the table above: (1) as is clear from example 3 and example 6, under the same conditions, the distance between the ridges and the furrows adjacent to each other on the surface of the nonwoven fabric filtration layer was within a preferable range in the former, and the filter element obtained in the former had higher collection efficiency and higher air permeability than the latter.
(2) It is understood from examples 3 and 7 that, under the same conditions, the ratio of the area of the dimples per square meter of the surface of the nonwoven fabric filter layer is in a preferable range, and the filter element obtained in the former has a higher collection efficiency and a higher air permeability than the latter.
(3) As is clear from example 1 and comparative example 1, the thickness of the uneven pattern of the nonwoven fabric filter layer was too low in the latter case under the same conditions, and the air permeability of the filter element obtained in the latter case was lower than that in the former case.
(4) It is understood from example 1 and comparative example 2 that, under the same conditions, the thickness of the uneven pattern of the nonwoven fabric in the latter is excessively high, and the rigidity of the filter element obtained in the latter is lower than that in the former.
Claims (9)
1. Cylinder formula filter core, its characterized in that: the filter element at least comprises a non-woven fabric filter layer (2), wherein the cross section of the non-woven fabric filter layer (2) is of an intaglio structure, the thickness of the intaglio is 0.10-0.32 mm, and the thickness of the embossed is 0.55-0.80 mm.
2. A cylindrical filter element according to claim 1, wherein: the filter element also comprises a supporting layer (1), an upper end cover (3) and a lower end cover (4).
3. A cylindrical filter element according to claim 1, wherein: the concave lines are arranged in a linear mode, and the convex lines are arranged in an oblique line mode.
4. A cylindrical filter element according to claim 1, wherein: the distance between the adjacent convex lines and the concave lines is 0.50-1.30 mm.
5. A cylindrical filter element according to claim 1, wherein: the ratio of the area of the concave portion in each square meter is 7-20%.
6. A cylindrical filter element according to claim 1, wherein: the length of the concave grains is 2.00-8.00 mm.
7. A cylindrical filter element according to claim 1, wherein: the non-woven fabric filter layer (2) is made of polypropylene or polyester.
8. A cylindrical filter element according to claim 1, wherein: the non-woven fabric filter layer (2) is of a pleated structure, and the height of the pleat is 3.00-6.00 cm.
9. A cylindrical filter element according to claim 8, wherein: the distance between two adjacent pleated peaks is 0.50-3.00 cm.
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| CN202220077398.9U CN216537493U (en) | 2022-01-13 | 2022-01-13 | Cylindrical filter element |
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