KR20210053043A - Filter media and manufacture method thereof - Google Patents

Abstract

The present invention relates to a PPS non-woven fabric filter and a method for manufacturing the same. The PPS non-woven fabric filter includes: a core manufactured using a material made of synthetic resin; a plurality of web media which have pores of different sizes and are continuously wound on the outer surface of the core; a fixing member formed in a mesh shape to wrap and fix the outer surface of the plurality of web media wound around the core; and a pair of coupling members coupled to both ends of the web filter media and the fixing member. The PPS non-woven filter with excellent fineness, high strength, heat resistance, heat retardation and chemical stability can be manufactured by continuously winding the plurality of web media made of a melt blown non-woven fabric using PPS nanofibers on the outer surface of the core to form a plurality of layers.

Description

PPS nonwoven fabric filter and manufacturing method thereof TECHNICAL FIELD [FILTER MEDIA AND MANUFACTURE METHOD THEREOF]

The present invention relates to a PPS nonwoven filter and a method for manufacturing the same, and more particularly, to a PPS nonwoven filter for filtering the entire filtrate such as industrial water so that it can be reused, and a method of manufacturing the same.

In recent years, as the water shortage intensifies, microfiltration technology has been developed to secure alternative water resources or reuse water.

The water reuse market up to now has limited use of hydrophilic/irrigation water with low added value, and economic feasibility must be secured for the use of industrial water with high added value by expanding highly reused water.

Accordingly, the government is promoting a profitable local government private operation method project by subsidizing 100 billion won by 2016 for projects related to sewage treatment water reuse.

In general, in the field of microfiltration, a sand filtration method, a polymer membrane, a melt blown nonwoven fabric, other nonwoven fabric, and a method using a precision filter material such as glass fiber are used.

For example, in Patent Document 1 below, a sand filtration method using sand particles as a filter medium and a sand filtration device technology using the same are disclosed.

In addition, the present applicant has disclosed a microfiltration filter and a method of manufacturing the same in a number of patent documents 2 and 3 below, and has applied for a patent and has been registered.

However, the sand filtration method has a problem in that the use of chemicals causes environmental pollution, generates a large amount of sludge, has a high facility investment cost, and has to prepare a large-scale site.

And, in the case of using a fine filter material, there is a problem in that the filtration flow rate is low, the durability of the separator module is weak, and the filtration response ability according to the change of raw water is low.

The polymer separator is expensive, and when the object to be treated has a high viscosity or a high concentration, clogging occurs immediately, so that the object to be used is limited.

The melt blown nonwoven fabric has an advantage of being inexpensive in price compared to a separator, but has a limitation in removal performance.

The glass fiber is known as a material having excellent removal performance, but due to the characteristics of the glass material, it is accompanied by a risk of breaking, and there is a limit in removal efficiency.

Korean Patent Publication No. 10-2003-0009891 (published on February 5, 2003) Korean Patent Registration No. 10-0706935 (announced on April 13, 2007) Korean Mickguk Patent Registration No. 10-1666463 (announced on October 17, 2016) Korean Patent Registration No. 10-1983025 (announced on May 28, 2019)

On the other hand, polyphenylene sulfide (hereinafter referred to as'PPS') fiber, one of the super fibers, is used by processing short-fiber needle-punching nonwoven fabrics into a bag filter for pretreatment. I am using a surface filter.

The manufacturing of radial nonwoven fabrics using resins such as PP and PET has been manufactured and commercialized by various companies through many studies, but PPS radial nonwovens have difficulties in the design and manufacturing process of manufacturing equipment, and some are due to problems in processing and complexing processes, etc. It was conducted only in companies at the level of basic testing, and there is almost no development at this time.

In particular, the PPS melt blown nonwoven fabric is an industrial filter that requires extreme heat resistance and chemical resistance, and processing conditions and complex manufacturing technology of the material for application are required.

An object of the present invention is to solve the above-described problems, and PPS nonwoven fabric having excellent fineness, high strength, heat resistance, heat resistance and chemical stability by using a synthetic resin material having mass production, light weight, electrical insulation, and rust resistance. It is to provide a filter and a method of manufacturing the same.

Another object of the present invention is to provide a PPS nonwoven filter capable of preventing secondary contamination of a PPS nonwoven filter by applying a core made of synthetic resin instead of a core made of stainless steel having high strength and heat resistance, and a method of manufacturing the same.

In order to achieve the above object, the PPS nonwoven filter according to the present invention has a core manufactured using a material made of a synthetic resin, has pores of different sizes, and a plurality of web media continuously wound around the outer surface of the core. , A fixing member formed in a net shape and surrounding and fixing the plurality of web media wound around the core, and a pair of coupling members coupled to both ends of the web media and the fixing member.

In addition, in order to achieve the above object, the method of manufacturing a PPS nonwoven filter according to the present invention includes the steps of: (a) heating the web filter material to a preset temperature while passing through a pair of rollers, (b) heating Winding the outer surface of the core by using the elasticity of the web filter material, (c) a web filter material having a larger pore size than the web filter material wound around the core is continuously input and wound around the outer surface of the core to form a plurality of layers. And (d) fixing the web media by installing a fixing member formed in a net shape on the outer surface of the web media wound around the core, and coupling a pair of coupling members to both ends of the web media and the fixing member. It characterized in that it comprises a.

As described above, according to the PPS nonwoven fabric filter and its manufacturing method according to the present invention, mass production by forming a plurality of layers by continuously winding a plurality of web media prepared from a melt blown nonwoven fabric using PPS nanofibers on the outer surface of the core. It is possible to manufacture a PPS nonwoven filter having excellent fineness, high strength, heat resistance, heat resistance and chemical stability by using a synthetic resin material having properties, light weight, electrical insulation, and rust resistance.

Accordingly, the present invention has an effect that it can be applied to the filtration and separation industry, which is an important factor, by manufacturing a PPS nonwoven filter having excellent flame retardancy, heat resistance and chemical resistance.

In addition, according to the present invention, by making the core wound with the web filter made of synthetic resin material, secondary contamination of the PPS nonwoven filter and filtrate by rust generated in the core is prevented, and the load of the PPS nonwoven filter is reduced. By doing so, the effect of being able to reduce weight is obtained.

1 is a block diagram of a precision filtration apparatus to which a PPS nonwoven filter according to the present invention is applied,
2 is a perspective view of a PPS nonwoven filter according to a preferred embodiment of the present invention,
3 is a partially cut-away perspective view of the PPS nonwoven filter shown in FIG. 2;
4 is a process chart illustrating step-by-step a method of manufacturing a PPS nonwoven filter according to a preferred embodiment of the present invention;
5 is a diagram illustrating a process of winding the web media on the core.

Hereinafter, a PPS nonwoven fabric filter and a manufacturing method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a configuration of a microfiltration plant to which a PPS nonwoven filter according to the present invention is applied will be described with reference to FIG. 1.

1 is a block diagram of a microfiltration device to which a PPS nonwoven filter according to the present invention is applied.

The microfiltration device to which the PPS nonwoven fabric filter according to the present invention is applied, as shown in FIG. The first filter unit 20 for primary filtration of the entire filtrate by adjusting the voids between the plurality of PPS nonwoven fabric filters 40 by being in close contact with each other while being compressed so that the volume of the plurality of PPS nonwoven fabric filters 40 is reduced by the pressure of And a second filtering unit 30 for secondary filtering the filtrate supplied from the first filtering unit 20 using the membrane module 31.

The agglomeration reaction unit 10 may be provided with a flocculant supply device (not shown) that supplies a flocculant to agglomerate the solid fine particles contained in the entire filtrate.

The coagulant supply device adjusts the injection amount of the coagulant according to the inflow load such as the flow rate or pressure of the entire filtrate flowing into the coagulation reaction unit 10 so that the optimum conditions for forming a floc by coagulating the solid particles together I can.

The first filtration unit 20 first filters the entire filtration solution through a plurality of PPS nonwoven fabric filters 40 provided therein by the pressure of the filtration solution supplied from the coagulation reaction unit 10, and uses the washing water to filter the PPS nonwoven fabric. It functions to restore the original shape by backwashing the filter 40.

To this end, in the supply pipe between the first filtration unit 20 and the coagulation reaction unit 10, the transfer is pumped to supply the entire filtrate in which the solid fine particles are aggregated in the coagulation reaction unit 10 to the first filtration unit 20. A pump can be provided.

The first filtration unit 20 is first filtered by a filtration tank 21 receiving the entire filtrate through a lower side, a plurality of PPS nonwoven fabric filters 40 and PPS nonwoven fabric filters 40 installed in the filtration tank 21. It may include a delivery pipe 22 for delivering the filtrate to the second filtering unit 30.

The second filtration unit 30 functions to micro-filter the filtrate first filtered under low differential pressure and low energy conditions using the membrane module 31 and backwash the membrane module 31 using washing water.

To this end, a transfer pump provided between the first filtration unit 20 and the second filtration unit 30 is provided with a transfer pump that pumps the first filtered filtrate to the second filtration unit 30. I can.

The membrane module 31 may be provided as a hollow fiber type ultrafiltration membrane module.

Meanwhile, the configuration of the precision filtration device to which the PPS nonwoven fabric filter according to the present invention is applied has been described with reference to FIG. Please note that there is.

Next, a configuration of a PPS nonwoven fabric filter according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is a perspective view of a PPS nonwoven filter according to a preferred embodiment of the present invention, and FIG. 3 is a partially cutaway perspective view of the PPS nonwoven filter shown in FIG. 2.

The PPS nonwoven filter 40 according to a preferred embodiment of the present invention, as shown in Figs. 2 and 3, has a core 41 manufactured using a material made of a synthetic resin, has pores of different sizes, and has a core ( A plurality of web media 42 sequentially wound on the outer surface of 41), a fixing member 43 and a web media 42 that are formed in a net shape and wrap and fix the outer surface of the web media 42 wound around the core 41 And a pair of coupling members 44 coupled to both ends of the fixing member 43 and.

As shown in FIG. 3, the core 41 is formed in a substantially cylindrical shape with both ends open, and the entire filtration liquid outside the PPS nonwoven filter 40 passes through the web filter medium 42 on the outer surface of the core 41. A plurality of moving holes 45 through which the filtered filtrate moves into the inside may be formed.

For example, the moving holes 45 may be arranged in a grid shape along a plurality of columns and rows. Of course, the present invention is not necessarily limited thereto, and the number and arrangement shape of the moving holes 45 may be variously changed.

On the other hand, the core 41 is a synthetic resin such as plastic to prevent secondary contamination of the PPS nonwoven filter 40 and filtrate due to oxidation of the core made of steel or stainless steel according to the prior art, that is, rust. It can be manufactured using the material of the material.

For example, the core 41 may be manufactured using polypropylene having excellent chemical resistance, mechanical properties, and thermal properties.

As described above, the present invention prevents secondary contamination of the PPS nonwoven filter and filtrate due to rust generated in the core by making the core of a material made of synthetic resin, and reduces the load of the PPS nonwoven filter, thereby reducing the weight.

Each web filter material 42 may be formed in a plate shape using a material made of a synthetic resin such as plastic.

For example, the web filter material 42 may be prepared as a melt-blown nonwoven fabric using nanofibers obtained by spinning polyphenylene sulfide (hereinafter referred to as “PPS”).

The PPS nanofiber is a porous web in the form of a stacked form by welding into a three-dimensional network at the same time as production, and has a very high surface area ratio to volume compared to the conventional PPS fiber, and is a material capable of bending shape.

For example, the melt blown nonwoven fabric using the PPS nanofibers may be manufactured by the manufacturing method described in Patent Document 4.

PPS melt blown nonwoven fabric selects raw materials with a melt index suitable for melt blown spinning, and then controls the moisture content of the raw materials to less than 200 ppm through drying, and melts the dried raw materials at a temperature of 320°C to achieve a DCD length of 13.5 cm. It can be prepared by collecting in a collector that is present.

The ultra-fine PPS melt blown nonwoven fabric manufactured as described above has excellent heat resistance and chemical resistance, so it can be applied as a high-precision filter that requires heat resistance among industrial filters.

On the other hand, in the present embodiment, the web media 42 may be provided in plural, for example, 2 to 5, or 6 or more. The plurality of web media 42 may have pores of different sizes.

According to the prior art, the nanoweb reduces the pore size through a calendering process and imparts stability of the pore.

On the other hand, PPS nanofibers are nonwoven fabrics that are resistant to heat and are difficult to process.

Accordingly, in this embodiment, pores are formed before processing by adjusting the thickness of the PPS nanofibers, and microfibers are stacked by increasing the basis weight to improve the completeness of the nonwoven fabric without going through a calendering process.

The fixing member 43 is formed in a net shape in which a plurality of permeable holes are formed so that the entire filtrate can permeate, and the outer diameter of the PPS nonwoven filter 40 by wrapping the outer surface of the web media 42 wound around the core 41 It functions to fix.

The pair of coupling members 44 may be formed in a substantially cap shape with an open inner surface coupled to both ends of the web media 42 so as to be coupled to both ends of the web media 42, respectively.

Accordingly, a coupling space in which both ends of the web media 42 wound around the core 41 are coupled may be provided on the inner side of each coupling member 44.

And at the center of each coupling member 44, the filtrate flowing into the core 41 is transferred from the first filtering unit 20 to the second filtering unit 30 of the microfiltration device, and the first filtering unit ( A through hole may be formed so that it can be installed in 20).

Meanwhile, in the present embodiment, both the fixing member 43 and the coupling member 44 may be manufactured using a material made of a synthetic resin such as PP or PPS.

Next, a method of manufacturing a PPS nonwoven filter according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5.

FIG. 4 is a process chart explaining step-by-step a method of manufacturing a PPS nonwoven filter according to a preferred embodiment of the present invention, and FIG. 5 is a diagram illustrating an operation of winding a web filter material on a core.

A method of manufacturing a PPS nonwoven fabric filter according to a preferred embodiment of the present invention includes (a) heating the web filter material 42 to a preset temperature while passing through a pair of rollers 50, and (b) heating the web filter material. The step of winding the outer surface of the core 41 using the elasticity of (42), (c) a web filter medium 42 having a larger pore size than the web filter medium 42 wound around the core 41 is continuously input to the core ( Forming a plurality of layers by winding the outer surface of 41) and (d) fixing the web media 42 by wrapping the outer surface of the web media 42 wound around the core 41 with a fixing member 43, and It includes the step of coupling a pair of coupling members 44 to both ends of the (42) and the fixing member (43), respectively.

In detail, in step S10 of FIG. 4, the web filter material 42 made of a melt-blown nonwoven fabric using PPS nanofibers is passed between a pair of rollers 50 and wound around the outer surface of the core 41.

For example, a plurality of web media 42 having pores of different sizes are continuously introduced into a space between a pair of rollers 50 arranged vertically and side by side, as shown in FIG. 5.

At this time, the web media 42 is heated to a preset temperature, for example, about 200 to 250°C.

In this way, as the web media 42 is heated to the set temperature in the process of being wound around the outer surface of the core 41, the surface of the web media 42 is partially melted to form a film.

Subsequently, when the web media 42 having a larger pore size than the web media 41 wound around the core 41 is continuously introduced, the web media 42 having a molten surface is spun bonded in the process of being wound around the outer surface of the core. They are elastically bonded to each other by the (spun bond) method (S12).

For example, in the case of winding four web media 42 on the core 41, the pores of each web media 42 are formed to be about 3 μm, 5 μm, 8 μm, and 10 μm, and the pore size is small. It may be sequentially input from the filter media 42.

As described above, according to the present invention, by heating to a set temperature in the process of continuously winding a plurality of web media on the core, the web media having a melted surface are welded together to reduce the size of pores and provide stability.

On the other hand, in the present invention, in the case of winding a total of four web media 42, the web media 42 is heated while the first and second web media are input, and the heating is stopped while the remaining web media are added, and the corresponding web media ( The pores formed in 42) can be maintained as it is.

As described above, the present invention can prevent clogging of the PPS nonwoven filter and improve filtration performance in the process of filtering the filtrate by effectively disposing the pores of the PPS nonwoven filter.

On the other hand, the front end of the web media 42 wound around the core 41 may partially overlap with the rear end of the previously wound web media 42 or may contact each other.

Of course, the present invention may form a plurality of layers by winding the next web media 42 regardless of the previously wound web media 42.

By repeating this process, a plurality of web media 42 are continuously wound around the core 41, and then a mesh-shaped fixing member 43 is wound on the outer surface of the web media 42 wound around the core 41. The web media 42 is fixed (S14).

In step S16, the assembly of the PPS nonwoven filter 40 is completed by combining a pair of coupling members 44 formed in a cap shape at both ends of the web media 42 and the fixing member 43, respectively.

The results of the filtration performance experiment of the PPS nonwoven fabric filter manufactured through the above process will be described with reference to Table 1 below.

Table 1 is a table of results of testing the filtration performance of a PPS nonwoven filter according to a preferred embodiment of the present invention.

Particle size
(㎛) Removal efficiency (%) 10 minutes 20 minutes 30 minutes 40 minutes 50 minutes 60 minutes Average One 39.99 4.66 55.36 7.88 24.36 19.17 25.24 2 95.39 77.93 94.11 71.73 86.73 81.16 84.51 3 99.58 95.82 99.17 92.13 97.05 94.47 96.37 4 99.98 99.52 99.92 98.51 99.36 98.47 99.29 5 100.00 99.95 99.99 99.81 99.88 99.61 99.87 6 99.99 99.95 99.99 99.97 99.98 99.91 99.97 7 99.99 99.99 99.99 100.00 99.99 99.98 99.99 8 100.00 99.99 100.00 100.00 100.00 99.99 100.00

The filtration performance test conditions were tested dust ISO 12103-1,A3, the dust concentration was 30 mg/L, and the flow rate was 11.4 L/min.

As shown in Table 1, the PPS nonwoven filter 40 according to the present embodiment provides a removal efficiency of about 96% or more when the particle size is 3 μm, and about 99% or more 100 when the particle size is 4 μm or more. It was confirmed that it provides a removal efficiency close to% or 100%.

Through the process as described above, the present invention forms a plurality of layers by continuously winding a plurality of web media prepared by melt blown nonwoven fabric using PPS nanofibers on the outer surface of the core to form a mass production, light weight, electrical insulation, It is possible to manufacture a PPS nonwoven filter having excellent fineness, high strength, heat resistance, heat resistance and chemical stability by using a synthetic resin material having anti-rust properties.

In addition, the present invention prevents secondary contamination of the PPS nonwoven filter and filtrate due to rust generated in the core by manufacturing the core wound with the web filter material made of synthetic resin, and reduces the load of the PPS nonwoven filter to reduce weight. can do.

Although the invention made by the present inventor has been described in detail according to the above embodiment, the invention is not limited to the above embodiment, and it goes without saying that the invention can be changed in various ways without departing from the gist of the invention.

The present invention is applied to the technology of a PPS nonwoven fabric filter in which a plurality of layers is formed by continuously winding a plurality of web media prepared from a melt blown nonwoven fabric using PPS nanofibers on the outer surface of a core, and a method of manufacturing the same.

10: coagulation reaction unit 20: first filtration unit
21: filtration tank 22: delivery pipe
30: second filtration unit 31: membrane module
40: PPS nonwoven filter 41: core
42: web media 43: fixing member
44: coupling member 45: moving hole
50: roller

Claims (7)

Core manufactured using synthetic resin material,
A plurality of web media having pores of different sizes and continuously wound around the outer surface of the core,
A fixing member that is formed in a net shape and wraps and fixes the outer surfaces of a plurality of web media wound around the core, and
A PPS nonwoven filter comprising a pair of coupling members coupled to both ends of the web filter material and the fixing member. The method of claim 1,
The core is manufactured using polypropylene to prevent contamination of the PPS nonwoven filter and filtrate due to oxidation,
A PPS nonwoven fabric filter, characterized in that a plurality of moving holes for moving the filtrate filtered by the plurality of web media to the inner space are formed on the outer surface of the core. The method of claim 1,
Among the plurality of web media, some of the web media are heated to a preset temperature in the process of being introduced between a pair of rollers, so that their surfaces are partially melted and are elastically welded to each other on the outer surface of the core,
PPS non-woven fabric filter, characterized in that the remaining web media to be introduced after being wound around the core in a state in which heating is stopped. The method of claim 3,
The web filter material is a PPS nonwoven fabric filter, characterized in that it is provided with a melt-blown nonwoven fabric using nanofibers obtained by spinning polyphenylene sulfide (hereinafter referred to as'PPS'). In the manufacturing method of the PPS nonwoven fabric filter according to any one of claims 1 to 4,
(a) heating the web media to a preset temperature while passing through a pair of rollers,
(b) winding the outer surface of the core by using the elasticity of the heated web media,
(c) continuously inputting a web filter material having a larger pore size than the web filter material wound around the core and winding it around the outer surface of the core to form a plurality of layers; and
(d) fixing the web media by installing a fixing member formed in a mesh shape on the outer surface of the web media wound around the core, and coupling a pair of coupling members to both ends of the web media and the fixing member. A method of manufacturing a PPS nonwoven filter, characterized in that. The method of claim 5,
The method of manufacturing a PPS nonwoven filter, characterized in that the web media heated to the set temperature are elastically welded to the outer surface of the core while the surface is partially melted. The method of claim 5,
Step (a) is a method of manufacturing a PPS nonwoven fabric filter, characterized in that heating a part of the plurality of web media that are continuously added, and then stopping the heating when the remaining web media are added thereto.

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