KR102594953B1 - Filter for water purifier and method for making the filter media - Google Patents

Abstract

The present invention relates to a filter suitable for use as a main filter of a direct water purifier and a method of manufacturing the filter, comprising: a microorganism removal layer that removes microorganisms in water; A turbidity removal layer located on one or both sides of the microorganism removal layer and removing particulate matter in water; And a support layer located on both sides of the outermost layer of the filter, wherein the microorganism removal layer, the turbidity removal layer, and the support layer are joined and integrated, and are bent in a zigzag to provide a water purification filter for removing particulate matter having a wrinkled shape. , a microorganism removal material that removes microorganisms in water, a turbidity removal material that removes particulate matter in water are placed on one or both sides of the microorganism removal material, and a support material is placed on both sides of the outermost layer of the filter, wherein the microorganism removal material is placed on both sides of the outermost layer of the filter. Providing a water filter manufacturing method comprising the steps of manufacturing a composite material by integrating the detachment material and the support material in a predetermined order or at the same time, and forming a wrinkled shape by bending the integrated composite material in a zigzag manner. do.

Description

Material for main filter of direct water purifier and method of manufacturing the filter {FILTER FOR WATER PURIFIER AND METHOD FOR MAKING THE FILTER MEDIA}

The present invention relates to a filter suitable for use as the main filter of a direct water purifier and a method of manufacturing the filter.

Typically, a direct water purifier consists of a pre-carbon filter, main filter, and post-carbon filter. The pre-carbon filter uses the adsorption method of activated carbon to remove chemicals harmful to the human body such as carcinogens (THMs), synthetic detergents, pesticides, and residual chlorine, and the post-carbon filter removes water that has passed through the main filter. It plays a role in removing unpleasant tastes, odors, and pigments contained in the product. In other words, both the pre-carbon filter and the post-carbon filter perform the role of removing chemicals.

Additionally, the main filter is responsible for removing particulate matter, and depending on the filter, it can even remove viruses and bacteria.

Typically, the main filter used in direct water purifiers in Korea is mostly a positive charge filter with the ability to remove microorganisms (bacteria and viruses), and a hollow fiber membrane (UF) without virus removal ability is also used.

Commonly used UF filters have the ability to remove some bacteria, but do not have the ability to remove viruses. In addition, the pore size of positive charge filters is approximately 0.2 to 2.0㎛, and the filter shape is formed by bending a single material. It is manufactured with When using a material with a single pore like this, the problem of early clogging of the filter's pores is likely to occur when purifying water with high turbidity.

In addition, in these water purifiers, if there are microorganisms in the raw water, the post carbon filter, etc., is easily contaminated with bacteria and causes a problem of regrowth. Because bacteria are introduced into the storage tank by a contaminated post carbon filter, there is a problem that microorganisms re-proliferate in the storage tank a second time. Additionally, bacteria or microorganisms may infiltrate and multiply in the purified water stored in the storage tank from the outside, and scale may form on the inner wall of the storage tank.

Therefore, there is a need to further improve the performance of the main filter for removing particulate matter including microorganisms.

The present invention seeks to provide a filter suitable for use as the main filter of a direct water purifier and a method of manufacturing the filter.

The present invention relates to a water purification filter for removing particulate matter in water. According to one embodiment, the water purification filter includes a microorganism removal layer for removing microorganisms in water; A turbidity removal layer located on one or both sides of the microorganism removal layer and removing particulate matter in water; and a support layer located on both sides of the outermost layer of the filter, wherein the microorganism removal layer, the turbidity removal layer, and the support layer are joined and integrated, and are bent in a zigzag manner to have a wrinkled shape.

In another embodiment, the water purification filter operates in the flow direction from the inlet side to the outlet side of the water to be treated, supporting layer/first turbidity removal layer/microorganism removal layer/second turbidity removal layer/support layer, support layer/first turbidity removal layer/microorganism removal. It may have a layer structure of layer/support layer, or support layer/microorganism removal layer/secondary turbidity removal layer/support layer.

As another embodiment, the microorganism removal layer may be a non-woven fabric substrate coated with or chemically bonded to a positively charged material.

As another embodiment, the nonwoven fabric of the microorganism removal layer may be made of at least one fiber selected from the group consisting of glass fiber, cellulose fiber, polypropylene fiber, polysulfone fiber, and polyester fiber.

In another embodiment, the positively charged material is selected from the group consisting of boehmite, poly diallyl dimethyl ammonium chloride (DADMAC), melamine formaldehyde/colloidal silica, and cross-linked polyethyleneimine. It can be at least one thing.

As another embodiment, the nonwoven fabric of the microorganism removal layer may have a unit weight of 0.5 g/m2 to 300 g/m2 and a pore size of 0.2 μm to 20 μm.

As another embodiment, the microorganism removal layer may be made of a material in which boehmite is composited with a nonwoven fabric of PET fiber.

As another embodiment, the turbidity removal layer may use a non-woven material.

As another embodiment, the turbidity removal layer may be a non-woven fabric made of at least one fiber selected from the group consisting of polypropylene, PET, polyethylene, polyamide, and cellulose.

As another embodiment, the turbidity removal layer may be a non-woven fabric with a unit weight of 15-90 g/m2 and a pore size of 5-100 μm.

In another embodiment, the first turbidity layer is a nonwoven fabric with a unit weight of 20 to 50 g/m2 and a pore size of 15-30㎛, and the second turbidity layer is a nonwoven fabric with a unit weight of 10 to 40g/m2 and a pore size of 2-30㎛. The nonwoven fabrics of the first turbidity layer and the second turbidity layer are different in at least one of unit weight and pore size, but the nonwoven fabric of the second turbidity layer has a larger unit weight or pore size than the nonwoven fabric of the first turbidity layer. It may be smaller in size.

As another embodiment, the support layer may be a non-woven fabric made of at least one fiber selected from the group consisting of polypropylene, PET, polyethylene, polyamide, and cellulose.

As another embodiment, the support layer may be a nonwoven fabric with a unit weight of 15 to 90 g/m2 and a pore size of 50 to 150 μm.

In another embodiment, the microorganism removal layer, turbidity removal layer, and support layer are integrated by bonding by at least one method selected from the group consisting of hot melt spray bonding, ultrasonic sealing, heat sealing, thermal bonding, chemical bonding, and gravure bonding. You can.

As another embodiment, the microorganism removal layer, turbidity removal layer, and support layer may be bonded by hot melt spraying of EVA or propylene binder.

The present invention also seeks to provide a method for manufacturing a water purification filter. According to one embodiment of the present invention, the method for manufacturing a water purification filter includes a microbial removal material for removing microorganisms in water, and a detaching material for removing particulate matter in water. is placed on one or both sides of the microorganism removal material, and a support material is placed on both sides of the outermost layer of the filter. The microorganism removal material, the removal material, and the support material are integrated by joining in a predetermined order or at the same time to form a composite material. It includes manufacturing steps and zigzag bending the integrated composite material to form a wrinkled shape.

As another embodiment, the bonding may be performed by at least one method selected from the group consisting of hot melt spray bonding, ultrasonic sealing, heat sealing, thermal bonding, chemical bonding, and gravure bonding.

As another embodiment, the bonding may be performed by hot melt spray bonding using EVA or propylene as a binder.

Furthermore, the present invention provides a direct water purifier including a pre-carbon filter, a water purification filter of any of the above-mentioned embodiments, and a post-carbon filter.

By using the filter of the present invention as the main filter of a direct water purifier, it is possible to efficiently remove particulate matter including microorganisms present in the water to be treated while providing a sufficient purified water flow rate, and further, the service life of the filter, i.e. It is possible to provide a filter material that can prolong the ability to maintain a constant flow rate.

Figure 1 (a) is a cross-sectional view of a water purification filter according to the present invention, and (b) shows the layer structure of the filter.
Figure 2 shows the results of evaluation of turbidity removal performance for the filters of Example 1 and Comparative Example 1 (membrane area: 0.041 m2).
Figure 3 is a diagram showing the flow rate maintenance evaluation results for the filters of Example 1 and Comparative Example 1.
Figure 4 shows the results of turbidity removal performance evaluation for the filters of Example 2 and Comparative Example 2 (membrane area: 0.047 m2).
Figure 5 is a photograph of the particulate matter removal mechanism of the filter of the present invention and the surface state of each layer constituting the filter after water purification.

The present invention seeks to provide a main water purification filter for a direct water purifier. Hereinafter, the present invention will be described in detail with reference to the drawings.

The water purification filter provided by the present invention includes a microorganism removal layer, a turbidity removal layer, and a support layer. An example of the structure of the water purification filter of the present invention is schematically shown in Figure 1. Figure 1 schematically shows a cross-sectional view (a) and a layer structure (b) of the water purification filter of the present invention.

As shown in Figure 1 (b), the water purification filter of the present invention may have a layer structure of support layer - primary turbidity removal layer - microorganism removal layer - secondary turbidity removal layer - support layer, and as another example, support layer - primary agent. It may have a layer structure of turbidity layer-microorganism removal layer-support layer, or support layer-microorganism removal layer-first turbidity removal layer-support layer. Preferably, it consists of a support layer - a first turbidity removal layer - a microorganism removal layer - a second turbidity removal layer - a support layer.

The support layer serves to protect the microorganism removal layer and each turbidity removal layer when manufacturing the filter of the present invention, and is disposed on both sides of the filter provided by the present invention. The support layer does not substantially have a function of removing particulate matter.

The support layer material may be a non-woven fabric, and the non-woven fabric may be made of natural or synthetic fibers. For example, synthetic polymers such as PP, PET, PE, PA, and natural materials such as cellulose may be used alone or in combination. There is no particular limitation as to what can be done. However, preferably PP spunbond nonwoven fabric can be used.

It is preferable not to use chemicals when manufacturing the non-woven fabric, which is the material of the support layer. When chemicals are used, residual chemicals may leach out into the water during the water purification process, contaminating water quality.

Since the support layer material does not need to play a role in removing particulate matter in water, but can play a role in protecting the internal turbidity removal layer and microbial removal layer, there is no particular limitation on its pore size or unit weight. For example, the support layer material may have a pore size of 50 to 150㎛ and a unit weight of 15 to 90g/m2. More preferably, the nonwoven fabric used as the material for the support layer may have a unit weight of 15 to 50 g/m2 and a pore size of 70 to 120 μm.

Furthermore, the nonwoven fabric of the support layer material may use fibers with a diameter of 15 to 100 μm, and more preferably, the fiber diameter may be 20 to 50 μm.

The turbidity removal layer used in the filter of the present invention is located on the inner surface of the support layer and serves to remove large particle size particles contained in raw water. By first removing large-sized particulate matter using the turbidity removal layer, the burden of removing particulate matter in the microorganism removal layer can be reduced, thereby allowing the purified water flow rate to be maintained for a longer period of time.

The detaching layer may use non-woven fabric as a detaching material. The non-woven fabric can be made of synthetic polymers such as polypropylene (PP), polyethylene terephthalate (PET), polyethylene (PE), and polyamide (PA), and fibers made of natural materials such as cellulose, and these can be used alone. Of course, they can be used in combination. Among these, it is preferable to use polypropylene meltblown nonwoven fabric.

It is preferable that the non-woven fabric does not contain chemicals when manufacturing the non-woven fabric. Chemicals included in the production of non-woven fabrics may dissolve in water and deteriorate water quality.

As exemplified above, the turbidity layer may be located on both sides of the microorganism removal layer, and may be located on the front (primary turbidity layer) or rear (first turbidity layer) of the microorganism removal layer based on the direction of water flow from the inlet side to the outlet side. It may be located only in one of the secondary turbidite layers. In particular, the first turbidity removal layer serves to remove large particulate matter in raw water and can reduce the burden of removing particulate matter in the microbial removal layer, so it is more preferable to include at least a first turbidity removal layer.

The detaching material of the first detaching layer can be appropriately adjusted depending on the particle size of the particulate matter to be removed. For example, the unit weight of the material is 15 to 90 g/m2, and the pore size of the nonwoven fabric is 5 to 100 ㎛. It is desirable to have a range. If the pore size of the nonwoven fabric is smaller than the above range, there is a problem of increasing the water treatment burden on the primary turbidity removal layer, and if the pore size is larger than the above range, the effect of removing particulate matter by the primary turbidity removal layer is reduced. This may cause a burden on the microbial removal layer. On the other hand, if the unit weight is less than the above range, the effect of removing particulate matter from the internal content of the material is small, and if it exceeds the above range, it may act as resistance due to excessively high density, resulting in a decrease in flow rate. More preferably, the unit weight of the detaching material of the first detaching layer is 20-50 g/m2, and the pore size of the nonwoven fabric may be 15 to 30 μm.

Meanwhile, the first turbidity removal material for the first turbidity layer may be a fiber having a diameter in the range of 3 to 50 ㎛, and more preferably, the fiber diameter may be in the 3 to 15 ㎛ range.

The filter of the present invention may include a secondary turbidity removal layer on the discharge side of the microorganism removal layer. The secondary turbidity layer serves to prevent the collected particulate matter from flowing out of the filter even in unusual situations where high pressure is momentarily applied.

Therefore, it is preferable that the detackling material of the secondary side layer has higher detachment performance than that of the first detackling layer. Accordingly, the nonwoven fabric as a secondary detaching material needs to have better performance in removing particulate matter as at least one of unit weight and pore size is different from that of the primary detaching material. More specifically, the detaching performance of the secondary detaching layer is required. It is preferable that the material has a larger unit weight or smaller pore size than the detaching material of the first turbidity layer.

The unit weight of the detaching material of the secondary detaching layer may be 15 to less than 90 g/m2, and the pore size of the nonwoven fabric may be in the range of 5 to less than 100 ㎛. The second turbidity removal layer more preferably has a unit weight of 10-40 g/m2 of the turbidity material, and the pore size of the nonwoven fabric may be 15 to 30 ㎛.

Meanwhile, the first turbidity removal material for the first turbidity layer may be a fiber having a diameter of 3 to 50 ㎛, and more preferably, a fiber having a diameter of 3 to 15 ㎛. The smaller the pore size of the non-woven fabric, which is the material of the secondary turbidity layer, the more desirable it is in terms of preventing external outflow of particulate matter, but this may cause resistance and reduce the flow rate. Therefore, it is desirable to have a pore size within the above range.

Meanwhile, the filter of the present invention includes a microorganism removal layer on the water outlet side of the primary turbidity removal layer and on the water intake side of the secondary turbidity removal layer. The microorganism removal layer removes particulate matter that has passed through the turbidity layer without being removed, and further serves to remove microorganisms present in raw water.

Nonwoven fabric can be used as the microorganism removal material. When using the non-woven fabric, as described above, particulate matter can be removed not only from the surface of the non-woven fabric but also from the inside, making it more effective in removing particulate matter.

Conventionally, UF material has been used as the main filter of water purifiers, but in this case, particulate matter is removed only from the surface, making it easy to close pores, which has the problem of shortening the life of the filter due to a decrease in flow rate. However, when non-woven fabric is used as a material for the turbidity removal layer as in the present invention, particulate matter can be removed not only from the surface of the material but also from inside the material, and due to the many pores, there is a problem of flow rate reduction due to removal of particulate matter. can be significantly reduced.

The non-woven fabric used as the microorganism removal material is not particularly limited, and any non-woven fabric used as a filter material for a water purifier can be suitably used in the present invention, for example, glass fiber, cellulose, polypropylene, polyester, and polyacrylic. It may be a non-woven fabric using fibers such as ronitrile (PAN), polyvinylidene fluoride (PVDF), polystyrene (PS), and polysulfone. These can be used individually, as well as two or more can be used in combination. Preferably, a non-woven material made of PET fiber can be used.

The non-woven fabric as the microorganism removal material may have a unit weight of 0.5 g/m2 to 300 g/m2 and a pore size of 0.2 ㎛ to 20 ㎛, more preferably a unit weight of 1 to 200300 g/m2, and 0.5 to 10 g/m2. It is desirable to have a pore size of ㎛.

As the microorganism removal material, non-woven fabric may have a fiber diameter of 0.02 ㎛ to 100 ㎛, more preferably 0.2 to 50 ㎛.

The microorganism removal layer is intended to remove bacteria, viruses, and fine particles present in raw water. To this end, the microorganism removal layer may be physically or chemically bonded to a positively charged material to remove mainly negatively charged microorganisms from the nonwoven fabric.

The positive charge material can be suitably used in the present invention as long as it is commonly used to remove microorganisms, and is not particularly limited, and includes, for example, boehmite, poly DADMAC (poly diallyl dimethyl ammonium chloride), and melamine. Formaldehyde-colloidal silica (Melamine formaldehyde/colloidal silica) and cross-linked polyethyleneimine are included.

The positive charge material may be complexed to the nonwoven fabric in the form of a physical bond or chemical bond. There is no particular limitation on the method of applying the positive charge material to the non-woven fabric, which is a material for removing microorganisms. The chemical bonding method includes, for example, hydrothermal polymerization. When the non-woven fabric, which is a material for removing microorganisms, has a functional group, the method described above may be used. The same positively charged material can be bound to the functional group of the nonwoven fabric. Meanwhile, the physical bonding method can be applied by mixing positive charge resin with a binder and coating it on the surface of non-woven fabric, which is a material for removing microorganisms. In this case, the positively charged material is

In the present invention, the microorganism removal material is more preferably PET fiber and boehmite composite.

The water purification filter of the present invention is preferably integrated by bonding the microorganism removal layer, turbidity removal layer, and support layer. The water purification filter of the present invention is used by bending it in a zigzag manner and forming it into a wrinkled shape to increase the surface area. When each layer of the microorganism removal layer, turbidity removal layer, and support layer is simply laminated, each material must be individually bent to form a wrinkled shape, which may result in reduced productivity. On the other hand, when bending them simultaneously, the process is complicated, including the forming process while supplying the material for each layer, and it is difficult to obtain the desired shape.

Accordingly, in the present invention, it is preferable to stack the microorganism removal layer, turbidity removal layer, and support layer in a layer structure as illustrated above, and to integrate them by bonding them. By integrating the materials of each layer, the molding process can be further simplified.

Methods for integrating each layer include hot melt spraying, ultrasonic sealing, heat sealing, heat bonding, chemical bonding, and gravure bonding. . However, in the case of the ultrasonic sealing, there is a tendency to harden the material at the sealed area, and as a result, there is a risk of the sealing area being damaged during the forming process by bending.

More preferably, a hot melt spray method can be used, which has the lowest possibility of fabric leakage during the sealing process and has excellent processability. In the case of hot melt spraying, the binder is partially dispersed on the surface of the nonwoven fabric of each layer, reducing the risk of blocking the pores of the nonwoven fabric. Furthermore, the binder is evenly dispersed on the surface of the nonwoven fabric of each layer, preventing damage to the sealing area during the bending process. This is desirable because there are no problems caused by this.

Meanwhile, when using the hot melt spray method, EVA (ethylene vinyl acetate) and propylene can be used as the binder. Among these, when EVA is used, a trace amount of vinyl acetate may be eluted into water, so it is preferable to use propylene to ensure material safety and dissolution safety.

The method of joining each material by the hot melt spray method will be explained by taking the case where the water purification filter of the present invention has a structure of support layer/primary turbidity removal layer/microorganism removal layer/secondary turbidity removal layer/support layer as an example. However, the following description does not limit the method of joining the filter of the present invention to this, and a person skilled in the art can easily change the layer structure, joining method, and order of the filter as needed from the following description. will be.

In the process of supplying the material for each layer, a binder is sprayed on at least one side of each layer, that is, the side in contact with the material of another layer, using a hot melt spray method, and then each layer can be bonded simultaneously by applying pressure.

Furthermore, any two or more layers may be selectively bonded first, and the mutually bonded bonding materials may be bonded to each other. For example, a propylene binder is bonded between the support layer and the first turbidity removal layer, and the second turbidity removal layer and the support layer by hot melt spraying. More specifically, for example, a propylene binder is hot melt sprayed and bonded to one surface of either the support layer or the first turbidity removal layer. Spraying hot melt on the entire surface may be undesirable as it will close the pores of the material. In the same manner, the remaining support layer and the second turbidity layer are bonded by hot melt spray. Next, a propylene binder is hot-melt sprayed on the other sides of the first and second turbidity removal layers and bonded to both sides of the microorganism removal layer, respectively. As a result, a water purification filter material having a structure of support layer/primary turbidity removal layer/microorganism removal layer/secondary turbidity removal layer/support layer can be obtained.

Next, it includes the step of bending the obtained integrated water filter material and forming it into a wrinkled shape as shown in (b) of FIG. 1. For example, the water purification filter material may be formed in a zigzag pattern along the circumferential direction to have an overall cylindrical shape. Since the water purification filter is formed in a wrinkled shape, the contact area with water can be increased by about 1.5 to 10 times. Therefore, by maximizing the effective filtration area of the water purification filter, filtration performance can be further improved.

The water purification filter according to the present invention obtained as a result can not only efficiently remove particulate matter including microorganisms, but also reduce the burden on each layer, prolong the life of the filter material, and increase the water purified water flow rate. It can be kept constant for a long time.

Example

Hereinafter, the present invention will be described in more detail through examples. The following example shows an example of the present invention, and the present invention is not limited thereto.

Example 1

As a microbial removal material, boehmite was prepared by chemically bonding to the surface of a nonwoven fabric made of PET fiber (average fiber diameter 35㎛, unit weight approximately 120g/㎡, average pore size 2㎛) by hydrothermal polymerization.

As for the detaching material, PP meltblown nonwoven fabric (average fiber diameter 10㎛, unit weight about 30g/㎡, average pore size 25㎛) was used as the first detaching material, and PP meltblown nonwoven fabric (average fiber diameter 10㎛) was used as the first detaching material. , unit weight of approximately 20g/m2, average pore size of 20㎛) was prepared for use as a second detaching material.

Two PP spunbond nonwoven fabrics (average fiber diameter 30㎛, unit weight approximately 20g/㎡, average pore size 100㎛) were prepared as support layer materials.

The prepared first tack removal material and one support layer material, the second tack removal material, and the other support layer material were each laminated using a hot melt spray method. In the hot melt spray, propylene was used as a binder.

Subsequently, the microorganism removal material was laminated to each other by a hot melt spray method so as to face the turbidity removal layer of the bonding material of the laminated support layer and turbidity removal layer. In the above hot melt spray, propylene was used as a binder.

As a result, a filter with a structure of support layer - first turbidity removal layer - microorganism removal layer - second turbidity removal layer - support layer was manufactured with a membrane area of 0.041 m2.

The obtained filter was evaluated for turbidity removal performance and flow rate release power as follows. The results of the turbidity removal performance evaluation are shown in FIG. 2, and the flow rate maintenance evaluation results are shown in FIG. 4.

Detachment performance evaluation method

- Water supply pressure: 3kgf/㎠ static pressure

- Concentration of particulate matter: 100ppm (@ Arizona dust, particle size 0~5㎛)

- Measurement: Calculate the cumulative amount of particulate matter removed until the differential pressure of 2.5kgf/㎠ is reached.

Flow retention evaluation method

- Flow rate: 2L/min (initial flow rate)

- Concentration: 1 NTU (@ A2 dust, particle size 0~80um)

- Measurement criteria: Calculate the cumulative flow rate up to the point where the flow rate decreases by 20% compared to the initial flow rate and check the tendency for the flow rate to decrease.

Example 2

In the same manner as Example 1, a filter with a membrane area of 0.047 m2 was manufactured.

The obtained filter was evaluated for turbidity removal performance in the same manner as in Example 1, and the results are shown in FIG. 3.

Comparative Example 1

A filter with a membrane area of 0.041 m2 was manufactured in the same manner as in Example 1, except that the first and second turbidity removal layers were not included. The filter thus obtained has a structure of support layer-microorganism removal layer-support layer.

The obtained filter was evaluated for turbidity removal performance and flow rate maintenance ability in the same manner as in Example 1, and the results are shown in Figures 2 and 4, respectively.

Comparative Example 2

A filter with a membrane area of 0.047 m2 was manufactured in the same manner as in Example 2, except that the first and second turbidity removal layers were not included. The filter thus obtained has a structure of support layer-microorganism removal layer-support layer.

The obtained filter was evaluated for turbidity removal performance in the same manner as in Example 1, and the results are shown in FIG. 4.

Particulate matter removal performance evaluation

As can be seen from Figures 2 and 4, when the water purification filter according to the present invention is used, it can be seen that the turbidity removal performance for removing particulate matter is significantly superior compared to the comparative example.

Flow retention evaluation

As can be seen from Figure 3, when the water filter according to the present invention was used, a constant flow rate was maintained even when the accumulated purified water amount reached 2500L, maintaining the flow rate maintenance ability. However, when the filter of Comparative Example 1 was used, the flow rate gradually decreased after the cumulative purified water volume reached 1000L, and the flow rate tended to decrease rapidly around 1500L.

After the turbidity removal performance evaluation was performed according to Example 1, the surface condition of each layer of the filter was confirmed, and the results are shown in FIG. 5. Furthermore, the particulate matter removal mechanism of the filter according to the present invention is also shown. This can be explained as follows.

From the raw water intake side to the purified water discharge direction, the first layer, the support layer, is intended to protect the turbidity removal layer and the microorganism removal layer during the filter manufacturing process. It plays a role in preventing contamination and damage, and has a particulate matter removal function. Almost never done. For this reason, although the first layer is supplied with raw water containing the most particulate matter, the degree of contamination of the filter is not significant. However, the back side of the first layer shows a contaminated state, which is not due to the removal of particulate matter, but rather is contaminated by particulate matter removed from the front side of the first turbidity layer, which is the second layer.

Meanwhile, the first turbidity removal layer performs the function of removing large particles. Large particles are first removed from the surface and inside of the first turbidity removal material, and as a result, the removed particulate matter is present on both the front and back of the filter. did. In particular, the back side is contaminated, showing that small particulate matter such as microorganisms and some large particulate matter pass through the first turbidity layer.

In addition, the microorganism removal layer performs the function of removing small particles and microorganisms in raw water, and removes some large particles and fine particles that have passed through the first turbidity removal layer. Meanwhile, the microorganism removal layer has a + charge and removes microorganisms with a - charge. As a result, the front side of the microorganism removal layer is in a contaminated state. However, the back side shows a clean state, which shows that small particulate matter such as microorganisms did not pass through the microorganism removal layer.

Furthermore, the second turbidity removal layer serves to prevent particles filtered in the microorganism removal layer from leaking into the discharged purified water by removing particles that have passed through the microorganism removal layer in special situations such as when high pressure is applied.

Lastly, the support layer on the water outlet side serves the same function as the support layer on the water intake layer and prevents contamination and damage to the turbidity removal layer and the microorganism removal layer.

Claims (19)

A microbial removal layer that removes microorganisms in water; a first turbidity removal layer located on one side of the microorganism removal layer and a second turbidity removal layer located on the other side, the layer removing particulate matter in water; and a support layer located on both sides of the outermost layer of the filter, in the flow direction of the water to be treated from the inlet side to the outlet side, the support layer, the first turbidity removal layer, the microorganism removal layer, the second turbidity removal layer, and the support layer. These are placed sequentially,
The microorganism removal layer, turbidity removal layer, and support layer are joined and integrated, and are bent in a zigzag manner to have a wrinkled shape,
The first turbidity removal layer, the second turbidity removal layer, and the microorganism removal layer are non-woven materials,
The nonwoven fabric of the microorganism removal layer has a unit weight of 0.5 g/m2 to 300 g/m2, a pore size of 0.2 μm to 20 μm, and a fiber diameter of 0.02 μm to 100 μm,
The nonwoven fabric of the first turbidity removal layer and the nonwoven fabric of the second turbidity removal layer have a unit weight of 15 g/m2 to 90 g/m2, a pore size of 5 μm to 100 μm, and a fiber diameter of 3 μm to 50 μm,
The nonwoven fabric of the microorganism removal layer has a larger fiber diameter, larger unit weight, and smaller pore size than the nonwoven fabric of the first turbidity removal layer and the nonwoven fabric of the second turbidity removal layer,
The nonwoven fabric of the first turbidity removal layer has the same fiber diameter as the nonwoven fabric of the second turbidity removal layer, and has a unit weight and larger pore size than the nonwoven fabric of the second turbidity removal layer. A water purification filter for removing particulate matter. delete The water purification filter according to claim 1, wherein the microorganism removal layer is coated or chemically bonded to a non-woven fabric substrate with a positive charge material. The method of claim 3, wherein the nonwoven fabric of the microorganism removal layer is selected from the group consisting of glass fiber, polypropylene fiber, polyacrylonitrile fiber, polyvinylidene fluoride fiber, polystyrene fiber, polysulfone fiber, polyester fiber, and cellulose fiber. A water filter consisting of at least one selected. delete The method of claim 3, wherein the positively charged material is a group consisting of boehmite, poly DADMAC (poly diallyl dimethyl ammonium chloride), melamine formaldehyde/colloidal silica, and cross-linked polyethyleneimine. At least one water purification filter selected from . The water filter according to claim 1, wherein the microorganism removal layer is a composite of boehmite and a non-woven fabric of PET fiber. delete The water filter according to claim 1, wherein the nonwoven fabric of the first turbidity removal layer and the second turbidity removal layer is a nonwoven fabric made of at least one fiber selected from the group consisting of polypropylene, PET, polyethylene, polyamide, and cellulose. delete delete The water filter according to claim 1, wherein the support layer is a non-woven fabric made of at least one fiber selected from the group consisting of polypropylene, PET, polyethylene, polyamide, and cellulose. The water filter according to claim 1, wherein the support layer is a nonwoven fabric with a unit weight of 15 to 90 g/m2 and a pore size of 50 to 150 ㎛. The method of claim 1, wherein the microorganism removal layer, the first turbidity removal layer, the second turbidity removal layer, and the support layer are selected from the group consisting of hot melt spray bonding, ultrasonic sealing, heat sealing, thermal bonding, chemical bonding, and gravure bonding. A water purification filter that is joined and integrated by at least one method. The water filter according to claim 1, wherein the microorganism removal layer, the first turbidity removal layer, the second turbidity removal layer, and the support layer are bonded by hot melt spraying of an EVA or propylene binder. A microbial removal material that removes microorganisms in water, a turbidity removal material that removes particulate matter in water, a first turbidity removal layer is placed on one side of the microorganism removal material, a second turbidity removal layer is placed on the other side, and both sides of the outermost layer of the filter are placed. A step of manufacturing a composite material by placing a support material on and integrating the microorganism removal material, the detaching material, and the support material by joining them in a predetermined order or at the same time; and
A step of bending the integrated composite material in a zigzag manner to form a wrinkled shape,
In the flow direction of the water to be treated from the inlet side to the outlet side, the support material, the first turbidity removal layer, the microorganism removal material, the second turbidity removal layer, and the support material are arranged sequentially,
The support material, the first turbidity removal layer, the second turbidity removal layer, and the microorganism removal material are non-woven materials,
The nonwoven fabric of the microorganism removal material has a unit weight of 0.5 g/m2 to 300 g/m2, a pore size of 0.2 μm to 20 μm, and a fiber diameter of 0.02 μm to 100 μm,
The nonwoven fabric of the first turbidity layer and the second turbidity layer has a unit weight of 15 g/m2 to 90 g/m2, a pore size of 5 μm to 100 μm, and a fiber diameter of 3 μm to 50 μm,
The nonwoven fabric of the microorganism removal material has a larger fiber diameter, larger unit weight, and smaller pore size than the nonwoven fabric of the first turbidity removal layer and the nonwoven fabric of the second turbidity removal layer,
The nonwoven fabric of the first turbidity removal layer has the same fiber diameter as the nonwoven fabric of the second turbidity removal layer, and has a unit weight and a larger pore size than the nonwoven fabric of the second turbidity removal layer. The method of claim 16, wherein the bonding is performed by at least one method selected from the group consisting of hot melt spray bonding, ultrasonic sealing, heat sealing, thermal bonding, chemical bonding, and gravure bonding. The method of claim 16, wherein the bonding is performed by hot melt spray bonding using EVA and propylene as binders. A direct type including a pre-carbon filter, a water purification filter according to any one of paragraphs 1, 3, 4, 6, 7, 9, 12 to 15, and a post-carbon filter. water purifier.

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