WO2018040500A1

WO2018040500A1 - Carbon fibre composite material, filter element, filter element forming method and forming device

Info

Publication number: WO2018040500A1
Application number: PCT/CN2017/072188
Authority: WO
Inventors: 曹佐国
Original assignee: 广州澜泉家用电器有限公司
Priority date: 2016-08-30
Filing date: 2017-01-23
Publication date: 2018-03-08
Also published as: CN106215509A

Abstract

Provided are a carbon fibre composite material, a filter element, a filter element forming method and a forming device. The carbon fibre composite material is prepared from the following components in parts by weight: 30-40 parts of activated carbon, 30-40 parts of an activated carbon fibre, 10-15 parts of a synthetic fibre, 8-15 parts of calcium sulphite powder, 5-10 parts of copper-zinc alloy powder, 0.5-2 parts of a binder and 90-100 parts of water. The filter element formed from the carbon fibre composite material solves the disadvantage that a carbon fibre material has a lower residual chlorine removal capacity at a large flow rate, and significantly improves the residual chlorine removal capability.

Description

Carbon fiber composite material, filter element, filter core forming method and molding device

Technical field

The invention relates to the field of water purification materials, in particular to a carbon fiber composite material, a filter element, a filter core forming method and a molding device.

Background technique

Carbon fiber is made of man-made chemical fiber with high carbon content and not melting during heat treatment. It is made by heat-stable oxidation treatment, carbonization treatment and graphitization. Due to its small specific gravity and large specific surface area, Therefore, it is widely used in various fields. Carbon fiber composite material is a very popular material in the field of household water purification. It is often used in the field of purification. Its working principle is to protect the equipment by separating solid particles in liquid or gas, or making full contact with different substances. Normal work or clean air, when the fluid enters the carbon fiber composite with a certain size of the filter, its impurities are blocked, and the clean flow can flow through the carbon fiber composite.

The traditional household carbon fiber filter element has the limitation of installation size and size. When the filtered water flow rate does not exceed 4L/min, the filtration effect can achieve the best effect. For example, the residual chlorine removal rate of tap water can reach 98% or more; Because in the family life, when the tap water comes out of the water or bathes and bathes, the flow rate of the effluent will exceed 8L/min. At such a large flow rate, the conventional household carbon fiber filter can reduce the residual chlorine capacity of the tap water to below 75%. Less than expected results.

Summary of the invention

Based on this, it is necessary to provide a carbon fiber composite material, a filter element, a filter element molding method, and a molding device with good water purification effect.

A carbon fiber composite material prepared from the following parts by weight:

In one embodiment, preferably, the carbon fiber composite comprises the following components by weight:

In one embodiment, the synthetic fiber is selected from at least one of a hydrophilic polyacrylonitrile-based synthetic fiber and a hydrophilic polypropylene synthetic fiber.

In one embodiment, the binder is selected from at least one of polyvinyl acetate, vinyl acetate, and polyvinyl pyrrolidone.

In one embodiment, the activated carbon, the activated carbon fiber, the calcium sulfite powder, and the copper-zinc alloy powder have a particle size of no more than 100 mesh.

A filter cartridge comprising the carbon fiber composite material of any of the above embodiments.

In one embodiment, the filter element further includes a skeleton and a flat membrane disposed on the skeleton, the skeleton is provided with a plurality of water passing holes and has a water channel therein; and the carbon fiber composite material covers the skeleton on.

In one embodiment, the water passage hole has a length of 20 to 40 mm * a width of 5 to 8 mm.

In one embodiment, the flat membrane is a hydrophilic membrane having a filtration accuracy of 0.1 to 0.3 μm.

A filter core forming method includes the following steps:

Each component is weighed according to the parts by weight of each component in the carbon fiber composite material according to any of the above embodiments;

Mixing the weighed activated carbon, the activated carbon fiber, the synthetic fiber, the calcium sulfite powder and the copper-zinc alloy powder, adding a binder and water, and uniformly mixing to obtain a mixed slurry;

The mixed slurry is placed in a filter core forming device and processed into a filter core semi-finished product;

The filter core semi-finished product is dehydrated and obtained after removing water.

In one embodiment, the filter element forming method further comprises symmetrically taking the activated carbon, the activated carbon fiber Dimensions, the synthetic fibers, the calcium sulfite powder, and the copper-zinc alloy powder are subjected to a grinding treatment and sieved through 100 to 200 mesh.

In one embodiment, the dehydration treatment specifically includes:

The filter core semi-finished product is placed in a centrifuge, dehydrated and dried;

The filter core semi-finished product after dewatering and drying is placed in an oven for drying.

In one embodiment, the spin speed of the centrifuge is between 1400 and 1600 r/min during the dewatering and drying process.

In one embodiment, the oven has a temperature of 105 to 120 ° C during the drying process.

In one embodiment, the mixing slurry is placed in a filter element forming device, and processed into a filter core semi-finished product. Specifically, the mixed slurry is placed in a filter element forming device, and a skeleton provided with a flat film is disposed. Putting in the filter forming device, rotating the skeleton to automatically flow the mixed slurry to the surface of the skeleton to form a semi-finished filter covering the skeleton, and the semi-finished filter is matched with the flat film. The skeleton constitutes the filter core semi-finished product.

In one embodiment, the width of the leakage opening for the mixed slurry blanking in the filter element forming device is 10-15 mm, and the length is not less than the length of the skeleton;

The rotation speed of rotating the skeleton is 60 to 100 r/min, and the time is 2 to 3 minutes.

A filter core forming device comprises a frame and a lower hopper, a skeleton mounting shaft and a skeleton rotation driving device disposed on the frame; an elongated leakage opening is arranged below the lower hopper; the skeleton is installed A shaft is located below the lower hopper for mounting a skeleton of the filter membrane to be coated, and the skeleton rotation driving device is coupled to the skeleton mounting shaft for driving the skeleton mounting shaft to rotate.

In one embodiment, the filter element forming apparatus further includes a recovery hopper, a reflux pump and a return pipe; the recovery hopper is below the shaft mounting shaft for recovering the mixed slurry; one end of the return pipe Connected to the bottom of the recovery hopper, the other end is in communication with the lower hopper; the return pump is disposed on the return line for pumping the mixed slurry recovered by the recovery hopper into the lower hopper use.

The carbon fiber composite material of the invention has a specific surface area of up to 1500 m ² /g, and has good adsorption effect, for example, the adsorption value of the macromolecular organic substance methylene blue is 200 mg/g, and the service life is long, and the total amount of tap water can be more than 20 tons, which can be widely used. In the water purification equipment such as the large flux water purifier. In addition, the carbon fiber composite material of the present invention has the following beneficial effects:

1. The activated carbon fiber material has the characteristics of loose and porous structure. When the tap water flow rate exceeds 8L/min, the tap water passes through the carbon fiber material, and the carbon fiber material is too short when the water passes through the carbon fiber material. It is too late to process, so the residual chlorine removal ability is relatively low, and the carbon fiber composite material of the present invention will be a calcium sulfite powder. And the copper-zinc alloy powder is dispersed into the pores of the activated carbon fiber material, increasing the contact area between the activated carbon fiber and the filtered water, prolonging the processing time of the filtered water through the carbon fiber composite material filter element, ensuring that the filtration is more fully and thoroughly, and effectively solving The disadvantage of the residual chlorine removal ability of the activated carbon fiber material at a large flow rate is remarkably improved, and the residual chlorine removal ability can be improved, for example, the residual chlorine removal capacity can reach 99% or more.

2. The activated carbon of the invention is filled in the pores of the activated carbon fiber, and the performance of the activated carbon fiber can reduce the cost of the activated carbon fiber; the main adsorption of the activated carbon fiber powder in the water purification process is a key material and determines the performance of the product. Synthetic fiber is beneficial to the synthesis of calcium sulphite powder, copper-zinc alloy powder and carbon fiber of composite carbon fiber materials; the synergistic action of several components makes the carbon fiber composite material have better filtering effect.

3. The calcium sulfite in the carbon fiber composite component of the present invention has a very fast ability to remove residual chlorine, and the residual chlorine in the water can be completely treated in a contact time of 0.8 seconds. After a large number of experiments, 1 gram of calcium sulfite can be continuously processed. More than 2 tons of residual chlorine from tap water. The tap water is disinfected with chlorine gas and has a strong pungent odor. Its reaction principle with calcium sulfite:

Cl ₂ +H ₂ O=HClO+HCl

HClO+HCl+2CaSO ₃ =CaSO ₄ ↓+CaCl ₂ +H ₂ O+O ₂ ↑.

4. After using the ordinary carbon fiber filter for a period of time, the carbon fiber material will breed bacteria. The carbon fiber filter mixed with copper-zinc alloy has good antibacterial effect, ensuring the long-term use of the carbon fiber filter, and also removing heavy metals in the water. The composite carbon fiber filter can be used in shower bath and whole house water purification to meet the requirements of large flux filtration. Specifically: when water passes through a copper-zinc alloy treatment medium, its oxidation-reduction potential changes from +200 mV to -500 mV. Under normal circumstances, various types of microorganisms can only grow under a specific oxidation-reduction potential, and the potential changes greatly. It can destroy the cells of bacteria, thus controlling the growth of microorganisms and acting as a bacteriostatic agent. The copper-zinc alloy treatment medium can remove heavy metal ions in water, such as lead, mercury, copper, nickel, cadmium, arsenic, antimony and many other soluble heavy metal ions, through redox reaction; the mechanism of copper-zinc alloy removal of heavy metal ions is as follows: : metal ions are plated on the surface of the copper-zinc alloy treatment medium or into the copper-zinc alloy crystal lattice, so that toxic heavy metal contaminants are combined on the copper-zinc alloy, for example, the dissolved lead ions in water are reduced to insoluble lead atoms, and Plated on the surface of copper-zinc alloy media, X-ray diffraction studies found that the removal of mercury is the formation of copper-mercury alloy.

DRAWINGS

1 is a schematic structural view of a skeleton of an embodiment;

Fig. 2 is a schematic view showing the structure of a filter element molding apparatus according to an embodiment.

detailed description

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the understanding of the present disclosure will be more fully understood.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The present embodiment provides a carbon fiber composite material prepared by the following components by weight: 30-40 parts by weight of activated carbon, 30-40 parts of activated carbon fiber, 10-15 parts of synthetic fiber, 8 to 15 parts by weight of calcium sulfite powder, 5 to 10 parts by weight of copper-zinc alloy powder, 0.5 to 2 parts of binder, and 90 to 100 parts of water; preferably 35 parts by weight of activated carbon, 35 parts by weight The activated carbon fiber, 12 parts by weight of synthetic fiber, 10 parts by weight of calcium sulfite powder, 8 parts by weight of copper-zinc alloy powder, 0.8 parts by weight of a binder, and 95 parts by weight of water were prepared.

The synthetic fiber is selected from at least one of a hydrophilic polyacrylonitrile-based synthetic fiber and a hydrophilic polypropylene synthetic fiber. Synthetic fiber is beneficial to the synthesis of activated carbon, calcium sulfite powder and copper-zinc alloy powder and activated carbon fiber. The binder is at least one selected from the group consisting of polyvinyl acetate, vinyl acetate, and polyvinyl pyrrolidone.

Preferably, in the carbon fiber composite material of the present embodiment, the activated carbon, the activated carbon fiber, the calcium sulfite powder and the copper-zinc alloy powder have a particle size of not more than 100 mesh, such as activated carbon, activated carbon fiber, calcium sulfite powder and copper zinc. After the alloy powder is ground, the meshing number is not less than 100 mesh.

The embodiment also provides a filter element comprising the above carbon fiber composite material. Specifically, in the present embodiment, as shown in FIG. 1 , the filter element further includes a skeleton 100 and a flat membrane (not shown) provided on the skeleton 100. The skeleton 100 is provided with a plurality of water passing holes 102 and has a water channel carbon fiber composite material covering the skeleton. Preferably, the skeleton 100 of the present embodiment has a cylindrical shape. It can be understood that in other embodiments, the skeleton 100 may also have a flat shape or the like. The size of the water passing hole 102 is preferably, but not limited to, 20 to 40 mm in length * 5 to 8 mm in width, preferably 30 mm * 8 mm. The flat membrane is preferably, but not limited to, a hydrophilic membrane having a filtration accuracy of 0.1 to 0.3 μm.

The embodiment further provides a filter core forming method, which comprises the following steps:

Each component is weighed according to the parts by weight of each component in the above carbon fiber composite;

Mixing the weighed activated carbon, activated carbon fiber, synthetic fiber, calcium sulfite powder and copper-zinc alloy powder, adding binder and water, and mixing uniformly to obtain a mixed slurry;

The semi-finished product of the filter element is dehydrated and obtained after removing water.

Preferably, in the embodiment, the filter element forming method further comprises the steps of arbitrarily taking activated carbon, activated carbon fiber, synthetic fiber, calcium sulfite powder and copper-zinc alloy powder for grinding, and sieving through 100 to 200 mesh.

Wherein, the dehydration treatment specifically comprises:

The semi-finished filter element after dewatering and drying is placed in an oven for drying.

Preferably, during the dehydration and drying process, the centrifuge has a rotational speed of 1400 to 1600 r/min, preferably 1500 r/min. During the drying process, the temperature of the oven is 105 to 120 °C.

In the dehydration treatment, the dehydration efficiency can be improved by the centrifuge first, and the subsequent baking time can be shortened, and the productivity can be increased and the energy consumption can be reduced.

Further, in the present embodiment, the mixed slurry is placed in the filter element forming device, and the processing into the filter element semi-finished product is: the mixed slurry is placed in the filter element forming device, and the skeleton provided with the flat plate film is placed in the filter element forming device. The skeleton is rotated to automatically flow the mixed slurry to the surface of the skeleton to form a semi-finished filter film covering the skeleton, and the semi-finished product of the filter membrane is matched with a skeleton having a flat membrane to constitute a semi-finished product of the filter core. Preferably, the rotational speed of the rotating skeleton is 60 to 100 r/min, and the time is 2 to 3 minutes.

As shown in FIG. 2 , the present embodiment further provides a filter element forming apparatus 200 including a frame 210 , a lower hopper 220 disposed on the frame 210 , a skeleton mounting shaft 230 , and a skeleton rotation driving device (not shown). . An elongated leakage port 222 is provided below the lower hopper 220. The leakage port 222 has a width of 10 to 15 mm, preferably 15 mm, and a length of not less than the length of the skeleton 100. A skeleton mounting shaft 230 is located below the lower hopper 220 for mounting the skeleton 100 to be coated with a filter. The skeleton rotation driving device is coupled to the skeleton mounting shaft 230 for driving the rotation of the skeleton mounting shaft 230, thereby driving the skeleton 100 to rotate.

Further, the filter element molding apparatus 200 of the present embodiment further includes a recovery hopper 240, a return pump (not shown), and a return line 250. The recovery hopper 240 is below the skeleton mounting shaft 230 for recovery of the mixed slurry. One end of the return pipe 250 communicates with the bottom of the recovery hopper 240, and the other end communicates with the lower hopper 220. A reflux pump is provided on the return line 250 for pumping the mixed slurry recovered by the recovery hopper 240 into the lower hopper 220 for reuse. By setting up recycling The recycling mechanism of the hopper 240, the return pump and the return pipe 250 can ensure the consistency of the batch quality of the product.

The carbon fiber composite material of the invention has a specific surface area of up to 1500 m ² /g, and has good adsorption effect, for example, the adsorption value of the macromolecular organic substance methylene blue is 200 mg/g, and the service life is long, and the total amount of tap water can be more than 20 tons, which can be widely used. In large water purifiers and other water purification equipment.

The following is a part of the specific embodiment

Example 1

The filter core is made of a carbon fiber composite material with a skeleton, a flat membrane and the like, and the carbon fiber composite material is prepared from the following components by weight:

The manufacturing process of the filter element includes the following steps:

1) respectively, activated carbon, activated carbon fiber, hydrophilic polyacrylonitrile-based synthetic fiber, calcium sulfite powder, copper-zinc alloy powder are ground and sieved through 100 mesh; hydrophilic polyacrylonitrile-based synthetic fiber;

2) preparing the activated carbon, activated carbon fiber, hydrophilic polyacrylonitrile-based synthetic fiber, calcium sulfite powder, copper-zinc alloy powder after being sieved according to the ratio, adding polyvinyl acetate and water to be uniformly mixed to obtain a mixed slurry;

3) The mixed slurry obtained in the step 2) is placed in a filter core forming device, and processed into a filter core semi-finished product;

4) The filter element semi-finished product obtained in step 3) is placed in a centrifuge, the rotation speed of the centrifuge is 1500r/min, and the dewatering is dried;

5) Finally, the semi-finished product of the filter element is dried in an oven, and the temperature of the oven is 105 ° C to obtain a finished filter product.

Example 2

A filter element is made of a carbon fiber composite material with a skeleton, a flat membrane, and the like, and the carbon fiber composite material is prepared from the following components by weight:

The manufacturing process of the filter element includes the following steps:

1) grinding activated carbon, activated carbon fiber, hydrophilic polyacrylonitrile-based synthetic fiber, calcium sulfite powder, copper-zinc alloy powder, and sieved through 200 mesh;

2) preparing activated carbon, activated carbon fiber, hydrophilic polypropylene synthetic fiber, calcium sulfite powder, copper-zinc alloy powder after being sieved according to the ratio, adding vinyl acetate and water to be evenly mixed to obtain a mixed slurry;

5) Finally, the semi-finished product of the filter element is dried in an oven, and the temperature of the oven is 110 ° C to obtain a finished filter product.

Example 3

The manufacturing process of the filter element includes the following steps:

1) Activated carbon, activated carbon fiber, hydrophilic polyacrylonitrile-based synthetic fiber, calcium sulfite powder, copper zinc The alloy powder is ground and sieved through 160 mesh;

2) preparing activated carbon, activated carbon fiber, hydrophilic polyacrylonitrile-based synthetic fiber, calcium sulfite powder, copper-zinc alloy powder after being sieved according to the ratio, adding polyvinyl alcohol pyrrolidone and water to uniformly mix to obtain a mixed slurry;

Example 4

The manufacturing process of the filter element includes the following steps:

1) grinding activated carbon, activated carbon fiber, hydrophilic polyacrylonitrile-based synthetic fiber, calcium sulfite powder, copper-zinc alloy powder, and sieved through 100 mesh;

2) preparing activated carbon, activated carbon fiber, hydrophilic polyacrylonitrile-based synthetic fiber, calcium sulfite powder, copper-zinc alloy powder after being sieved according to the ratio, adding polyvinyl acetate and water to be uniformly mixed to obtain a mixed slurry;

5) Finally, the semi-finished product of the filter element is dried in an oven, and the temperature of the oven is 120 ° C to obtain a finished filter product.

Performance test:

Ordinary pure activated carbon fiber filter with external diameter 45* inner diameter 20* length 140 mm and its implementation The composite carbon fiber filter cartridges of the same specifications and sizes as the comparative examples 1 to 4 were used as the comparative examples, and the filter product obtained in Example 1-4 was used as an experimental example, and the tap water of the same water source and the same flow rate (8 L/min) was passed through for filtration. The residual chlorine concentration is 1.0 to 1.2 mg/L, and the amount of residual chlorine in the filtered water is detected. The filtration removal rate of the test results is shown in Table 1 below.

Table 1 Removal rate of residual chlorine in filter-filtered water

总流量Total flow	实施例1Example 1	实施例2Example 2	实施例3Example 3	实施例4Example 4	对比例Comparative example
10L10L	99.99％99.99%	99.98％99.98%	99.98％99.98%	99.99％99.99%	73.37％73.37%
500L500L	99.95％99.95%	99.91％99.91%	99.91％99.91%	99.93％99.93%	73.34％73.34%
2000L2000L	99.85％99.85%	99.83％99.83%	99.82％99.82%	99.81％99.81%	73.04％73.04%
4000L4000L	99.46％99.46%	99.42％99.42%	99.45％99.45%	99.43％99.43%	67.17％67.17%
6000L6000L	98.45％98.45%	98.39％98.39%	98.46％98.46%	98.36％98.36%	60.72％60.72%
8000L8000L	97.81％97.81%	97.72％97.72%	97.75％97.75%	97.72％97.72%	59.46％59.46%
10000L10000L	94.99％94.99%	94.91％94.91%	95.01％95.01%	94.08％94.08%	53.18％53.18%
12000L12000L	94.23％94.23%	94.15％94.15%	94.31％94.31%	94.18％94.18%	51.56％51.56%
14000L14000L	91.05％91.05%	90.99％90.99%	91.01％91.01%	90.98％90.98%	41.18％41.18%

It can be seen from the above Table 1 that the filter elements of the first to fourth embodiments of the present invention can absorb chlorine in water in a large amount compared with a commercially available filter element, thereby ensuring more complete and thorough filtration, and satisfying the large-flux filtration effect. Requirements.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A carbon fiber composite material prepared by the following components by weight:
The carbon fiber composite material according to claim 1, which is prepared from the following components by weight:
The carbon fiber composite material according to claim 1 or 2, wherein the synthetic fiber is at least one selected from the group consisting of hydrophilic polyacrylonitrile-based synthetic fibers and hydrophilic polypropylene synthetic fibers.
The carbon fiber composite material according to claim 1 or 2, wherein the binder is at least one selected from the group consisting of polyvinyl acetate, vinyl acetate, and polyvinyl pyrrolidone.
The carbon fiber composite material according to claim 1 or 2, wherein the activated carbon, the activated carbon fiber, the calcium sulfite powder, and the copper-zinc alloy powder have a particle size of not more than 100 mesh.
A filter element comprising the carbon fiber composite material according to any one of claims 1 to 5.
A filter cartridge according to claim 6, further comprising a skeleton and a flat membrane provided on said skeleton, said flat membrane being welded to said skeleton by an ultrasonic machine, said skeleton being provided with a plurality of passages Water hole and water inside The carbon fiber composite material covers the skeleton.
The filter element according to claim 7, wherein said water passage hole has a length of 20 to 40 mm * a width of 5 to 8 mm.
The filter element according to claim 7, wherein the flat membrane is a hydrophilic membrane having a filtration accuracy of 0.1 to 0.3 μm.
A filter core forming method, comprising the following steps:

Each component is weighed according to the parts by weight of each component in the carbon fiber composite material according to any one of claims 1 to 5;

Mixing the weighed activated carbon, the activated carbon fiber, the synthetic fiber, the calcium sulfite powder and the copper-zinc alloy powder, adding a binder and water, and uniformly mixing to obtain a mixed slurry;

The mixed slurry is placed in a filter core forming device and processed into a filter core semi-finished product;

The filter core semi-finished product is dehydrated and obtained after removing water.
The filter element molding method according to claim 10, further comprising arranging said activated carbon, said activated carbon fiber, said synthetic fiber, said calcium sulfite powder and said copper-zinc alloy powder symmetrically. And the step of screening through 100 to 200 mesh.
The filter element molding method according to claim 10, wherein the dehydration treatment specifically comprises:

The filter core semi-finished product is placed in a centrifuge, dehydrated and dried;

The filter core semi-finished product after dewatering and drying is placed in an oven for drying.
The filter element molding method according to claim 12, wherein in the dehydrating and drying process, the rotation speed of the centrifuge is 1400 to 1600 r/min.
The filter element molding method according to claim 12, wherein in the drying process, the temperature of the oven is 105 to 120 °C.
The filter element molding method according to any one of claims 10 to 14, wherein the mixing slurry is placed in a filter element forming device, and the processing into a filter element semi-finished product is specifically: placing the mixed slurry In the filter element forming device, the skeleton provided with the flat membrane is placed in the filter element forming device, and the skeleton is rotated to automatically flow the mixed slurry to the surface of the skeleton to form a semi-finished filter film covering the skeleton. The filter semi-finished product is combined with the skeleton provided with the flat membrane to constitute the filter core semi-finished product.
A filter element molding method according to claim 15, wherein said filter element molding device is used for The width of the leakage opening of the mixed slurry blank is 10-15 mm, and the length is not less than the length of the skeleton;

The rotation speed of rotating the skeleton is 60 to 100 r/min, and the time is 2 to 3 minutes.
A filter core forming device, comprising: a frame and a lower hopper, a skeleton mounting shaft and a skeleton rotation driving device disposed on the frame; and an elongated leakage opening under the lower hopper; The skeleton mounting shaft is located below the lower hopper for mounting a skeleton of the filter membrane to be coated, and the skeleton rotation driving device is coupled to the skeleton mounting shaft for driving the skeleton mounting shaft to rotate.
A filter element molding apparatus according to claim 17, further comprising a recovery hopper, a reflux pump, and a return pipe; said recovery hopper being disposed below said skeleton mounting shaft for recovering the mixed slurry; said reflux One end of the pipe is in communication with the bottom of the recovery hopper, and the other end is in communication with the lower hopper; the return pump is disposed on the return pipe for pumping the mixed slurry recovered by the recovery hopper into the lower portion Reuse in the hopper.