JP2008229569A - Filter device equipped with flexible basket-shaped resin pipe filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter device hard to cause clogging and easy to maintain. <P>SOLUTION: On end part of a flexible perforated resin pipe comprising a resin material braided in a basket shape to form a flexible basket-shaped resin pipe filter. The flexible basket-shaped resin pipe filter is installed between the introducing port and discharge port of the filter device equipped with the introducing port of a stock solution and the discharge port for discharging a filtrate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filtration device that is installed in a fluid to separate and remove foreign substances in the fluid.

  Conventionally, metal mesh screens have been widely used as filtration filters for separating and removing foreign substances in fluids in waste liquid treatment systems such as factories and circulation systems for bathtubs and pools.

  For example, a waste liquid treatment system may include a microbial carrier treatment tank in which a particulate carrier that holds a high concentration of microorganisms for removing BOD (biological oxygen demand) is dispersed. In general, a flat metal mesh screen is used as a filter for preventing discharge from the tank together with the treatment liquid. Also, in circulation systems such as bathtubs and pools, a filtration device called a strainer or hair catcher is installed in the middle of piping to remove foreign substances in the fluid. Usually, a filtration filter such as a strainer is a cylindrical metal mesh. A screen is being used.

  However, the conventional mesh screen as described above is clogged because it is difficult to secure a sufficient filtration area due to restrictions on the scale of the apparatus to be installed and because it is fixedly installed in the apparatus. Because it is easy, it is necessary to frequently clean and replace the screen, and the burden of maintenance is large. In addition, in a so-called hair catcher, which is a filtration device used particularly in a circulation system of a bathtub, since pathogenic bacteria easily propagate from the usage environment, there is a problem in terms of hygiene when cleaning the filter portion. Even if the filter part is replaced without cleaning in consideration of hygiene, the cost burden increases.

  On the other hand, although not directly related to the above technical field, it has been proposed to use a net-like resin pipe formed by braiding a resin monofilament or the like as a water guide pipe embedded in a permeable paved road (for example, Patent Document 1). reference). This reticulated resin pipe has a selective permeability to prevent the intrusion of foreign materials such as sand and gravel, and a flexibility (flexibility) for installing on uneven surfaces and bending piping. Suitable for conduit pipes.

JP 2001-254873 A

  The inventor of the present case has studied the possibility of being used as a filter member because the reticulated resin tube has selective permeability and flexibility, and has come to make the present invention. That is, an object of the present invention is to provide a filtration device for fluid filtration that is less likely to be clogged and easy to maintain by sealing one end of a flexible resin tube and using this as a filtration membrane. .

  In order to achieve the above-mentioned object, a filtration apparatus for fluid filtration according to the present invention includes a housing having an introduction port for introducing a stock solution and a discharge port for discharging a filtered filtrate, and is housed in the housing. A flexible ridge formed by sealing one end of a flexible perforated resin tube made of a resin material knitted into a ridge, installed between the introduction port and the discharge port. And a resin tube filter.

  According to this configuration, since almost the entire side surface of the resin tube filter is a filtration surface, the filtration area relative to the installation space can be greatly increased. Further, since the perforated resin tube constituting the filter has a flexible structure, that is, a structure that bends elastically and flexibly, the filter is less likely to be clogged by being shaken by the flow of fluid. Therefore, the maintenance burden of the filtration apparatus in which the filter is installed is reduced.

  In the filtration device according to the present invention, the bowl-shaped resin tube filter includes a nipple to which the other open end of the filter is connected, and the stock solution and the filtrate that are fluids before and after passing through the filter. It is good also as what is connected to the pipe connection member which has a partition plate which partitions off, and forms the filter structure. By using such a filter structure, the filter structure can be easily attached to and detached from the housing, thereby improving the productivity and maintainability of the filtration device. In this case, it is preferable that the housing has a flexible tube, and the filter structure is accommodated in the flexible tube. By making the main tube portion of the filtration device flexible together with the internal resin tube filter, the filtration device according to the present invention can be installed as an alternative to the conventional filtration device even in existing facilities.

  In the filter structure, it is preferable that each of the plurality of perforated resin tube filters connected to the tube connecting member having a plurality of nipples has a length that is five times or more the inner diameter. By setting it as such length, attachment to the pipe connection member of a resin pipe filter becomes easy, and sufficient filtration area can be ensured.

  In the resin pipe filter according to the present invention, the numerous holes of the perforated resin pipe may be formed by stitch-like gaps. The perforated resin tube is preferably formed by braiding resin monofilaments and does not have a portion joined between the monofilaments. By adopting such a configuration, the resin tube filter can be configured to be more flexible, and further, the filter hole itself is deformed within a certain range as the filter swings, so clogging is more effective. Can be prevented.

  Furthermore, in the resin tube filter according to the present invention, the porous resin tube is formed by braiding a resin monofilament on a flexible mandrel with only a weft, heat-treating, and then removing the flexible mandrel, and between the monofilaments It is possible to have a diamond-shaped continuous stitch structure without the joints and warps. By forming the perforated resin tube constituting the resin tube filter in this way and having a structure without warp, the flexibility in the bending direction of the resin tube filter is increased and the resilience in the twisting direction is increased. . Therefore, even if bending, twisting, or entanglement between resin tube filters occur due to swinging, a decrease in filtration performance due to blockage of the resin tube is suppressed.

  In order to form the resin tube filter according to the present invention, the porous resin tube can be sealed by deforming and bonding at one end or by melt bonding with one or more. By sealing by these methods, a resin pipe filter can be formed by a simple process. In particular, when sealing by melt bonding, a resin tube filter can be formed of a single material, which is convenient for processing such as disposal and recycling.

  As described above, according to the filtration device according to the present invention, the filter can be prevented from being clogged by the increase in the filtration area and the filter oscillating property, thereby greatly reducing the maintenance burden of the filtration device. Is possible.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to this configuration.

  FIG. 1 is a perspective view showing an embodiment of a bowl-shaped resin pipe filter according to the present invention. This bowl-shaped resin pipe filter 1 is knitted in a bowl shape, and one end of a flexible resin pipe having a large number of holes formed by stitches is sealed by fusion bonding to form a tip portion 1a, and the other end is By forming the open end 1b in an open state, it is formed so as to function as a filter that filters the fluid by passing through the tube wall.

  As schematically shown in FIG. 2, the resin tube 11 that forms the basic structure of the saddle-shaped resin tube filter 1 is composed of resin monofilaments 15 wound around a plurality of bobbins 14 using only weft yarns without using warp yarns. The flexible mandrel 16 is braided on a long flexible mandrel 16 serving as a winding core, heat-treated, and then the flexible mandrel 16 is extracted in the axial direction (direction of arrow C). By performing the heat treatment in this manner, the inner surface of the resin tube 11 can be made into a smooth reticulated tube state, the inner surface strength can be suppressed, and the amount of drainage can be improved. Further, the resin tube 11 is formed without using warp yarns as described above, so that the resin tube 11 has a substantially rhombic continuous stitch having apexes in the longitudinal direction and the circumferential direction of the resin tube 11, and between the monofilaments. Since there is no part to join, it has a very flexible structure.

  Here, the resin monofilament refers to a linear body composed of any single resin fiber, and representative materials include polypropylene (PP), polyethylene (PE), polyester terephthalate (PET), polybutylene terephthalate (PBT), polyamide ( Ny) and vinylon (PVA fiber). PP, PET, and Ny are particularly suitable from the viewpoint of versatility and durability, but are not limited thereto.

  Further, the thickness of the resin monofilament 11 can be appropriately selected in consideration of the balance between the holding force of the tube shape and the flexibility in relation to the assumed inner diameter of the resin tube, but in this embodiment, the outer diameter is 0. The range is 1 mm to 5.0 mm.

  The flexible mandrel is a winding core that can be flexibly bent, and can be flexibly bent. Therefore, a long reticulated resin tube can be formed in a relatively narrow space. The material of the flexible mandrel 16 is preferably a material that is not easily deformed by heat treatment and has a slipperiness that facilitates the extraction process. Typical examples include a resin tube formed of a resin (heat resistant resin) having a heat deformation temperature higher than that of a resin monofilament, a metal flexible tube, or a heat resistant composite tube in which the surface of the metal flexible tube is coated with a heat resistant resin. In view of durability and slipperiness during extraction, it is preferable to use a heat resistant composite tube, and a heat resistant composite tube coated with a fluororesin as a heat resistant resin is particularly preferable.

  As a sealing method of the resin tube tip part which becomes the tip part 1a of the bowl-shaped resin tube filter 1, various generally known methods, for example, insertion of a sealing material (rubber plug or the like) inside the tube, outside the tube 1 can be used, such as tightening and sealing with a wire rod (wire, insulation lock tie, etc.), press sealing with metal fittings, fusion bonding of the resin tube 11, etc. In the embodiment of FIG. It is sealed. When melt bonding is used, the sealing portion is made of the same material as the other portions of the resin tube 11, so that the separation and collection after use of the bowl-shaped resin tube filter 1, incineration, disposal, recycling processing, etc. Is convenient.

  As shown in FIG. 3, this bowl-shaped resin pipe filter 1 is used as a filter structure 9 by connecting the opened base end 1 b to a single pipe connecting member 3. The single pipe connecting member 3 includes a nipple 3a that is a connecting portion with the bowl-shaped resin pipe filter 1 and a bowl-shaped partition formed at the end of the nipple 3a opposite to the side to which the resin pipe filter 1 is connected. It is comprised with the board 3b. As will be described later, the partition plate 3b has a function of partitioning the liquid before and after the bowl-shaped resin tube filter 1 in the liquid passage. The shape of the nipple that is the connecting portion is generally a bamboo shoot shape in which a plurality of annular irregularities are formed on the outer peripheral surface. However, in this embodiment, when pressed in the length direction, the braided joint angle widens and the inner diameter increases. The cylindrical nipple 3a is used in order to utilize the characteristic of the resin pipe that the inner diameter is reduced when it is enlarged and pulled in the length direction.

  Specifically, the outer diameter of the nipple 3a of the single pipe connecting member 3 is set to a range approximately equal to 1.2 times the inner diameter of the opened proximal end portion 1b of the free bowl-shaped resin pipe filter 1. The length of the nipple 3a is set to be 1.5 times or more of the inner diameter of the base end portion, and the base end portion 1b of the bowl-shaped resin tube filter 1 is put on the nipple 3a, and then in the direction of the tip end portion 1a. By pulling the bowl-shaped resin pipe filter 1, the bowl-shaped resin pipe filter 1 is fixed to the single pipe connecting member 3. That is, by using the nipple 3a having the shape and size as described above, practically sufficient fixation can be performed without performing secondary processing such as adhesion.

  As the pipe connecting member, in addition to the pipe connecting member 3 used alone as shown in FIG. 3, a composite pipe connecting member 5 in which a plurality of nipples 5a are integrally formed as shown in FIG. 4 may be used. As the material of the single pipe connecting member 3 and the composite pipe connecting member 5, any material can be used as long as it is a hard material. However, PP, PE, PET, etc. are particularly preferable in terms of durability and discardability. Is preferred.

  When the composite pipe connecting member 5 is used, as shown in FIG. 5, the tip portions 1a of the plurality of bowl-shaped resin pipe filters 1 are sealed by the above-described general sealing method, for example, melt bonding. What has been stopped may be connected to each nipple 5a of the composite pipe connecting member 5 to form a filter structure 9A. Alternatively, as shown in FIG. 6, the base end portion 1b of a plurality of resin pipes is connected to the nipple 5a of the composite pipe connecting member 5, and the distal end portions 1a are gathered to form a wire rod (wire, insulation lock tie, etc.) from the outside of the pipe. A plurality of resin tube filters 1 are integrated by sealing by means of tightening sealing by metal, press sealing by metal fittings, or fusion bonding of a resin monofilament tube (in the embodiment of FIG. 6 by sealing by an insulation lock tie 8). It is good also as the filter structure 9B which formed the bowl-shaped resin pipe filter bundle 7 of the state.

  When the filter structure 9A of FIG. 5 is used, since the plurality of bowl-shaped resin tube filters 1 are not bound to each other, the resin tube filters 1 are swung by the flow of fluid, and the resin tube filters 1 are used. , The contact and friction between the filters makes it very difficult to clog the filter. 9 A of filter structures which have such a form and characteristic are suitable for the use installed and used in a comparatively wide space. For example, in a waste liquid treatment system in which a fluid moves between tanks, it is installed in the tank as a filter for preventing the carrier from flowing out of the tank containing the carrier. On the other hand, since the filter structure 9B of FIG. 6 integrates the plurality of resin pipe filters 1 to form the filter bundle 7, handling such as assembly becomes easy. Therefore, it is suitable for an application where it is installed and used in a relatively narrow space, such as a piping system such as a strainer. 5 and 6, the partition plate 5b of the composite pipe connecting member 5 of the filter structures 9A and 9B has a disc shape. However, the shape may be appropriately changed according to the structure of the apparatus in which the filter structure is installed. It can be changed.

  A filtration device according to an embodiment of the present invention is shown in FIG. The filtration device 20 is connected to the fluid passage P and filters the fluid flowing through the fluid passage P. The filtration device 20 introduces a stock solution, which is a fluid to be filtered, and a discharge port 23 through which the filtered filtrate is discharged. A filter bundle 26 is housed in a bottomed cylindrical housing 25 having a bottom end, and the upper end opening of the housing 25 is closed by a detachable lid 27. The filter bundle 26 is obtained by bundling a plurality of bowl-shaped resin tube filters 1 of FIG. On the downstream side of the introduction port 21 on the inner peripheral surface of the housing 25, a filter support portion 29 made of an annular inner collar is provided. The bowl-shaped resin pipe filter 1 is installed in the housing 25. A sealing resin sheet 28 is attached to one end of the filter bundle 26, thereby sealing one end 1 a of each bowl-shaped resin tube filter 1. As shown in FIG. 8, the filter bundle 26 is arranged such that the axial centers O1, O2, and O3 of the three adjacent resin pipe filters 1 that are in contact with the outer peripheral surface form an equilateral triangle. The resin pipe filters 1 are arranged in a close-packed state. The undiluted solution flows into the resin tube filter 1 from the other open end (upper end) 1b of the resin tube filter 1 in FIG. 7, and is filtered by passing through the tube wall of the resin tube filter 1 to obtain a filtrate. And flows out of the resin pipe filter 1.

  7 except for the resin tube filter 1 and the bundling member 22, the housing 25, the inlet 21, the outlet 23, and the filter support portion 29 are the same as those used in the conventional filtering device. ing. In the conventional filtration apparatus, instead of the bound resin pipe filter 1, a bottomed cylindrical metal mesh screen that opens upward is mounted on the filter support 29 with a gutter provided on the outer edge of the upper end opening. It was installed by placing. Therefore, conventionally, the space S1 inside the housing 25 and above the filter support 29 is a dead space that is not involved in filtration at all. However, when the resin pipe filter 1 is used, the resin pipe filter 1 is extended to the upper space S1 so that foreign matters are once attached to the outer surface thereof. Since the foreign matter that oscillates and adheres to the outer surface of the resin tube filter 1 is easily detached, the conventional dead space can also be used effectively for filtration.

  That is, in the filtration device 30 according to the present embodiment, the stock solution introduced into the housing 25 from the introduction port 21 is filtered by the outer surface of the resin tube filter 1 in the upper space S1, and in parallel with this, the bowl-shaped resin tube The stock solution that has flowed into the resin tube filter 1 from the open base end portion 1b of the filter 1 is filtered by the tube wall of the resin tube filter 1 and flows out into the space S2 below the filter support portion 29. And discharged from the discharge port 23. Thus, since the entire tube wall of the resin tube filter 1 becomes the filtration area, it is possible to greatly increase the filtration area as compared with a conventional filtration device using a mesh screen. Oscillation (flexibility) prevents clogging and reduces the maintenance burden such as cleaning and replacement of the filter 1.

  A filtration device according to another embodiment of the present invention will be described with reference to FIGS. 9 and 10. As shown in the longitudinal sectional view of FIG. 9, the filtration device 30 of this embodiment has a housing 25 having a flexible tubular body 31 as a main body and an inlet 21, and an upstream end portion of the flexible tubular body 31. And a second flange member 37 having a discharge port 23 and connected to the downstream end of the flexible tubular body 31, and the filter structure 9 </ b> B is accommodated in the housing 25. ing. The filtration device 30 is connected between pipes Pu and Pd of a fluid circulation system such as a bathtub or a pool circulation system to form a part of the fluid passage P.

  10A to 10C are perspective views showing the constituent members of the housing 25. FIG. The flexible tubular body 31 which is a main tubular body portion of the housing 25 is a hose formed mainly of a flexible resin or rubber. As shown in FIG. In order to maintain the tube shape when the tube body 31 is bent, a ring-shaped or spiral-shaped hard material 43 is embedded at a predetermined interval. Instead of embedding the hard material 43, ring-shaped or spiral ridges 34 may be formed at predetermined intervals on the outer peripheral surface of the flexible tubular body 31. Moreover, it is preferable to form the flexible tubular body 31 with a transparent material in order to visually confirm the state during filtration and the state of clogging.

  The 1st flange member 35 used as the pipe connection member of the upstream side of the flexible tubular body 31 is T type cheese as shown in FIG.10 (B), The flange 35a is provided in the front-end | tip of the branch part of this T type cheese. The first portion of the straight portion has a bamboo shoot-shaped first nipple 35b serving as a connection portion with the flexible tubular body 31, and the other end has a cleaning port 35c covered with a removable cleaning port lid 35d. By providing the cleaning port 35c, operations such as attachment and replacement of the filter structure 9B are facilitated. On the other hand, the 2nd flange member 37 used as the pipe connection member of the downstream side of the flexible tubular body 31 is comprised by the flange 37a and the 2nd nipple 37b of a bamboo shoot shape as shown in FIG.10 (C).

  As shown in FIG. 9, on the upstream inner peripheral surface of the first nipple 35b of the first flange member 35, an annular inner collar serving as a filter support portion 35e for supporting the filter structure 9B is provided. . The filter structure 9B is attached to the flexible tube 31 by placing the outer peripheral portion of the partition plate 5b on the filter support portion 35e in a direction in which the resin tube filter bundle 7 protrudes downstream.

  A more detailed configuration of the present embodiment will be described. In the manner shown in FIG. 2, a PET monofilament 15 having an outer diameter of 0.8 mm is braided on a fluororesin flexible mandrel 16 having an outer diameter of 20 mm and a length of 25 m, followed by heat treatment at 150 ° C. for 0.5 hours. Then, the flexible mandrel 16 was pulled out to obtain a resin tube 11 having an inner diameter of 20 mm, a length of 25 m, and an intersection angle of 112 °. Eight pieces of 1 m long resin pipes 11 are cut from this resin pipe, and the eight pieces at a position of 50 mm from one end of each of these eight pieces are collectively bundled together by an insulating lock tie 8 shown in FIG. Sealing was performed to form a bowl-shaped resin tube filter bundle 7. A PP pipe having an outer diameter of 22 m and a length of 50 mm is used for the nipple 5 a forming the composite pipe connecting member 5 in FIG. 5, and each bottom portion of the eight nipples 5 a is attached to a disk-shaped partition plate 5 b having an outer diameter of 98 mm. The composite pipe joining member 5 was formed by joining. Further, the open end portion of each resin tube filter 1 of the resin tube filter bundle 7 of FIG. 6 was inserted and joined to each nipple 5a of this composite tube connecting member 5 to constitute a filter structure 9B. The flexible tubular body 31 in FIG. 9 was a flexible transparent resin hose having a spiral hard core material having an inner diameter of 100 mm and a length of 1 m. As the first and second flange members 35 and 37, flanges 35a and 37a having an outer diameter of 100 · 10k and first and second nipples 35b and 37b having an inner diameter of 95 mm were used.

  In this filtration device, the circulating water (raw solution) introduced into the filtration device 30 from the upstream pipe Pu reaches the filter structure 9 </ b> B through the internal space of the first flange member 35. Here, since the partition between the partition plate 5b and the filter support 35e is also sealed by water pressure, almost all of the circulating water passes through the inside of the nipple 5a and enters the inside of the bowl-shaped resin tube filter 1. When flowing in and passing from the inside of the bowl-shaped resin pipe filter 1 to the outside, foreign substances in the circulating water are separated. The filtered circulating water is discharged through the internal space of the second flange member 37 to the downstream pipe Pd.

  In the filtration device 30, the filtration area of the filter structure 9 </ b> B is greatly increased as compared with the conventional cylindrical mesh screen, and the flexible bowl-shaped resin tube filter bundle 7 is provided with circulating water. Oscillates with the flow. Moreover, in each resin tube filter 1, since there is no joint between the monofilaments, the hole shape also changes as the resin tube filter bundle 7 swings. Therefore, clogging due to the filtered foreign matter is extremely difficult to occur, and the burden on the cleaning operation of the filter 1 is greatly reduced. Furthermore, since the flexible tubular body 31 is formed of a transparent resin, the degree of contamination of the resin tube filter bundle 7 can be easily confirmed visually from the outside. Considering that the frequency of cleaning the filter 1 is greatly reduced, it is considered that it is possible to replace the filter structure 9B itself instead of cleaning and reuse. Hygiene problems can be improved.

  Further, since the main tube portion of the filtration device 30 is formed by the flexible bowl-shaped filter bundle 7 and the flexible tube body 31 covering the same, the relative position between the upstream side pipe Pu and the downstream side pipe Pd. However, it is easy to install the filtration device 30 in place of a filtration device such as a strainer with respect to existing circulation systems that are different from each other.

  In place of the filter structure 9B in the filtration device 30 in FIG. 7, the filter structure 9 in FIG. 3 or the filter structure 9A in FIG. 5 may be used.

It is a perspective view which shows the bowl-shaped resin pipe filter used for the filtration apparatus which concerns on one Embodiment of this invention. It is a schematic diagram which shows the manufacturing method of the resin pipe | tube used for the filtration apparatus which concerns on one Embodiment of this invention. It is a perspective view showing an example of a filter structure used for a filtration device concerning one embodiment of the present invention. It is a perspective view which shows the composite pipe connection member used for the filtration apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the other example of the filter structure used for the filtration apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the further another example of the filter structure used for the filtration apparatus which concerns on one Embodiment of this invention. It is a longitudinal section showing a filtration device concerning one embodiment of the present invention. It is sectional drawing which shows typically arrangement | positioning of the resin pipe filter in the filtration apparatus. It is a longitudinal cross-sectional view which shows the filtration apparatus which concerns on other embodiment of this invention. (A) is a perspective view showing a flexible tube of the filtration device of FIG. 9, (B) is a perspective view showing a first flange member of the filtration device, (C) is a perspective view showing a second flange member of the filtration device. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cone-shaped resin pipe filter 1a Tip part 1b Base end part 3 Single connection pipe member 3a, 5a Nipple 3b, 5b Partition plate 5 Composite connection pipe member 9, 9A, 9B Filter structure 11 Perforated resin pipe 15 Resin monofilament 16 Flexible Mandrel 20, 30 Filtration device 21 Inlet 23 Outlet 25 Housing 31 Flexible pipe P Fluid passage

Claims (8)

A housing having an inlet for introducing the stock solution and an outlet for discharging the filtered filtrate;
Sealing one end of a flexible perforated resin tube made of a resin material knitted into a bowl and housed in the housing and installed between the introduction port and the discharge port A flexible bowl-shaped resin tube filter formed of
A filtration device comprising:   2. The ridge-shaped resin tube filter according to claim 1, wherein a nipple to which the other open end of the filter is connected, and a partition plate that separates the stock solution and the filtrate that are fluids before and after passing through the filter. The filtration apparatus which is connected to the pipe connection member which has and forms the filter structure.   The filtration device according to claim 2, wherein the housing has a flexible tube, and the filter structure is housed in the flexible tube.   4. The pipe connecting member according to claim 2, wherein the pipe connecting member has a plurality of nipples, and each of the plurality of perforated resin pipe filters connected to the pipe connecting member has a length that is at least five times the inner diameter. Filtration device.   The filtration device according to any one of claims 1 to 4, wherein a large number of holes of the perforated resin tube are formed by stitch-shaped gaps.   The filtration device according to any one of claims 1 to 5, wherein the perforated resin tube is formed by braiding resin monofilaments and does not have a portion joined between the monofilaments.   The porous resin tube according to any one of claims 1 to 6, wherein the perforated resin tube is formed by braiding a resin monofilament on a flexible mandrel that is a winding core with only a weft and heat-treating the monofilament. A filtration device having a diamond-shaped continuous stitch structure without a joint and warp. The filtration device according to any one of claims 1 to 7, wherein the perforated resin tube is sealed by bundling a single or a plurality of tubes and deforming and binding or melting and bonding the one end portion. .

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