KR19990079069A - Nonwoven Filter, Manufacturing Method and Apparatus - Google Patents

Abstract

The present invention relates to a method for manufacturing a nonwoven filter and a device for filtering impurities. In the related art, productivity was reduced because the apparatus had to be stopped by removing the filter each time one nonwoven filter was made. It is equipped with a winding roller supply means for continuously preheating and feeding the winding roller and a driving roller installed under it, so that the nonwoven filter can be continuously made without interrupting the device, and thus the productivity is excellent, especially in the form of powdered diatomaceous earth, activated carbon, carbon Its performance is further improved by adsorbing and winding the non-woven fabrics, and further improving the performance of adhesives, beverages, chemicals, cleaning fluids, cosmetics, cutting oils, dyes, fruit juices, industrial paints, bottled water, industrial water, It is used to make nonwoven filter used to purify plating solution, waste water, etc.

Description

Nonwoven Filter, Manufacturing Method and Apparatus

The present invention relates to a nonwoven filter and a method and apparatus for manufacturing the same, in particular adhesives, beverages, chemicals, cleaning fluids, cosmetics, cutting oils, dyes, fruit juices, industrial paints, bottled water, industrial water, plating solutions, The present invention relates to a nonwoven filter used to filter impurities such as wastewater, and a method and apparatus for manufacturing the same.

In general, a nonwoven fabric made of a polymer material such as polypropylene fiber is rolled in a cylindrical form and is used as a filter for filtering various materials. The conventional way of making such a nonwoven filter is that the nonwoven is mostly made of thermoplastic polymer, and when the nonwoven is molded from roller to cylinder, the inner nonwoven layer is simply wound by tension compression, and only the outermost layer is heated by heat. It was completed by adhesion. The nonwoven filter made in this way is a state in which the intermediate layer is simply wound by crimping, so that it is impossible to form a dense adhesive state between the nonwoven layers, thus forming a sloppy structure, and fine particles of less than 1 micron cannot be filtered out. There was a performance limitation. In addition, there was a disadvantage that the durability is low because the internal structure is not dense, in particular, the manufacturing process is inconvenient because the cylindrical structure can be maintained by inserting a support core of a plastic material manufactured in a special form in the center of the nonwoven fabric during the manufacturing process. Of course, the loss of labor and the resulting increase in raw material and labor costs were very large.

Cylindrical cartridge filter manufacturing apparatus has been developed and applied to improve this disadvantage has been published in Patent Publication No. 90-3634. In this regard will be briefly described with reference to the accompanying drawings.

1 is a view schematically showing a conventional cylindrical cartridge filter manufacturing apparatus.

1 shows a conventional filter manufacturing apparatus 1. As shown, the filter manufacturing apparatus 1 has a body 5. One side of this body 5 is provided with a nonwoven fabric holder 10, and a nonwoven fabric 7 is wound thereon. A feed support roller 12 is provided above the nonwoven fabric holder 10, and a pressure roller 15 and a tension adjusting roller 17, which are opposed to each other, are provided behind the feed support roller 12. The plate heater 20 is provided in the inclined state at the rear of the pressure roller 15 and the tension control roller 17. Hot air heater 30 is located at the lower end of the plate heater 20. In addition, the nonwoven fabric winding roller 35 and the heat pressing roller 40 in a state of facing each other in succession are provided at the injection port of the hot air heater 30, and the infrared circumferential direction of the nonwoven fabric winding roller 35 is separated by a predetermined distance from the infrared rays. The spectroscopic radiator 42 is provided. In addition, the hydraulic cylinder 45 is installed below the plate heater 20. Here, the pressure roller 15 and the tension control roller 17 are installed adjacent to each other so as to pull the nonwoven fabric 7 evenly unfolded and to be drawn out to the plate heater 20 at the rear thereof, and the nonwoven fabric 7 therebetween. Is passed.

That is, the nonwoven fabric 7 is supplied to the pressure roller 15 and the tension adjusting roller 17 by a predetermined path, and the nonwoven fabric is supplied to the plate heater 20, the hot air heater 30, and the infrared spectroradiometer 42. Each of (7) is heated. Accordingly, the nonwoven fabric 7 is wound on the nonwoven fabric winding roller 35 while being thermally fused. After the nonwoven fabric 7 is completely wound up, the supply of the nonwoven fabric 7 is stopped and the body portion of the nonwoven fabric winding roller 35 is separated by a push rod and a connecting pipe to pull out the filter 70 from the body portion. See a patent publication for details. The hydraulic cylinder 45 is for adjusting the inclination angle of the frame 47 when necessary.

The disadvantage of the nonwoven fabric filter manufacturing apparatus as described above is that after the nonwoven fabric is completely wound on one nonwoven fabric winding roller, all the operation of the apparatus is stopped, the connector is disconnected, and the finished filter is separated and then the winding process is started again. It should be. That is, in the conventional nonwoven fabric filter manufacturing apparatus, the production efficiency is extremely low. In addition, the filter made by this nonwoven fabric filter manufacturing apparatus is composed only of nonwoven fabrics, so that extremely fine particles cannot be filtered out and their performance is reduced.

It is an object of the present invention to provide a method for manufacturing a nonwoven filter that can continuously produce a nonwoven filter without interruption of the apparatus, thereby making it possible to produce a nonwoven filter that can not only excel in productivity but also filter out extremely fine particles.

Another object of the present invention is to provide a nonwoven filter manufacturing apparatus for implementing the method of the present invention.

It is another object of the present invention to provide a nonwoven filter having a relatively high filtration performance compared to the conventional one.

1 is a schematic view showing a conventional cylindrical cartridge filter manufacturing apparatus,

2 is a block diagram illustrating a manufacturing process of a nonwoven fabric applied to the present invention;

Figure 3 is a perspective view showing an example of a nonwoven filter manufacturing apparatus according to the present invention,

4 is a configuration diagram for describing a configuration of the apparatus of FIG. 3;

5 is a cross-sectional view of the driving roller,

6 is a cross-sectional view of the forming roller,

7 is a view for explaining cutting means;

8 is a view showing another example of a nonwoven filter manufacturing apparatus according to the present invention,

9 is a perspective view of a nonwoven filter according to the present invention;

10 is a cross-sectional view according to FIG. 9 I-I;

11 to 14 are enlarged photographs of the aqueous grinding fluid,

15 to 18 are enlarged photographs of the water-soluble grinding liquid after filtering with a nonwoven filter manufactured according to the method of the present invention using diatomaceous earth of # 900 as a porous material,

19 is a graph showing the filtration rate of the nonwoven filter according to the present invention using diatomaceous earth as a porous material.

Explanation of symbols on the main parts of the drawings

100: non-woven fabric filter manufacturing apparatus 101: pulley

102: belt 103: motor

105, 105a: nonwoven fabric 107: nonwoven filter

110: body 111: nonwoven support

113: feed roller 120: porous material injector

122: porous material 130: winding roller supply means

131: tube 132: inclined guide

134: lifting mechanism 135: preheat roller

136: cylinder mechanism 140: pressure mechanism

150, 152: driving roller 154, 173: conveying means

157: slip ring 158: connector

160: winding roller 170: forming roller

175: pressure mechanism 180: pusher

190: cutting means 200: heating means

An object of the present invention is a method for manufacturing a nonwoven fabric filter, the step of transferring the nonwoven fabric along a predetermined path, preheating the winding roller for winding the nonwoven fabric, winding the nonwoven fabric in the winding roller after the preheating process, wound on the winding roller Paper can be achieved by a nonwoven filter manufacturing method comprising the step of pressing the nonwoven fabric, cutting the nonwoven fabric and leaving the winding roller.

It may be preferable to further include a step of coating a porous material on the conveyed nonwoven fabric, and in some cases, the method may include adding a porous material during the manufacturing process of the nonwoven fabric. The porous material may be powdered diatomaceous earth or activated carbon. And at least one of carbon.

In the preheating step, it is preferable that the winding roller is mounted on a predetermined preheating roller so that the whole surface is evenly preheated while being continuously rotated. The other nonwoven fabric is supplied to the nonwoven fabric conveyed above along a predetermined path, and the two nonwoven fabrics are heated. It is more preferable to further include the step of bonding by pressing the two non-woven fabric, which has been subjected to the heating step.

It is preferable to further include the step of forming the irregularities on the surface of the nonwoven fabric wound on the winding roller.

Another object of the present invention is a nonwoven filter manufacturing apparatus for producing a nonwoven filter using a nonwoven fabric, a plurality of feed rollers for continuously supplying a nonwoven fabric along a predetermined path, a nonwoven fabric winding roller for winding the supplied nonwoven fabric, winding Winding roller supply means for preheating the rollers and supplying them in sequence, driving roller for mounting and rotating the supplied winding roller, pressurizing means for pressurizing the winding roller mounted on the driving roller and winding the nonwoven fabric, and the nonwoven fabric is completely It can be achieved by a nonwoven filter manufacturing apparatus comprising a cutting means for cutting the nonwoven fabric after being wound.

It is preferable to further include a porous material injection means for coating a porous material on the non-woven fabric to be transported above and a heating means for heating the nonwoven fabric wound on the winding roller, wherein the winding roller supply means has a plurality of winding rollers in order It is more preferable that the constitution includes a tubular body having an inclined guide path which can be supplied by gravity and a preheating roller which is installed at the bottom of the inclined guide path and moves forward and backward to preheat while rotating the take-up roller.

In order to form the unevenness on the surface of the nonwoven fabric by rotating the winding roller wound around the nonwoven fabric, the forming roller further includes a forming roller having unevenness on the surface and a pressing mechanism for pressing the nonwoven fabric wound on the winding roller. It is better, and in some cases, it is more preferable to further include a heater and a pressure roller for supplying the other nonwoven fabric to the non-woven fabric supplied above to double bond.

The cutting means is preferably configured to include a cylinder mechanism having a rod and an elastic member installed between the heating wire and the rod and the heating wire.

Still another object of the present invention is a nonwoven filter, which is achieved by a nonwoven fabric filter comprising a cylindrical body formed by winding a nonwoven fabric and a porous material adsorbed to the nonwoven fabric to densely block pores of the nonwoven fabric.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a manufacturing process of a nonwoven fabric applied to the present invention.

The manufacturing process of nonwoven fabric is an opener process (91), which first releases polyflofilene, a chemical fiber used as a main raw material of nonwoven fabric, into a cotton form, and a stock feeder process that stores raw materials that have been loosened into cotton form and supplies them to a required place. (92), the first and second carding process (93, 94) for spraying the porous material to the nonwoven material by uncoupling the raw material supplied by the stock feeder in two carding machines, and cutting the product by the specification Knife process (95), calender process (96) to give strength to the specifications of the product by pressing and heat-bonding the two raw materials passed through the first and second carding process to extract the non-woven fabric form, winding the non-woven fabric to a predetermined roll The process 97 consists of. Of course, in some cases, the powdery porous material may be added to the nonwoven raw material by mixing or singly in the opener step, or may be applied to the raw material by spraying or the like in other steps.

3 is a perspective view showing an example of a nonwoven fabric filter manufacturing apparatus according to the present invention, Figure 4 is a block diagram for explaining the configuration of the apparatus of FIG.

3 and 4 illustrate a nonwoven filter manufacturing apparatus 100 according to the present invention. As shown, the nonwoven filter manufacturing apparatus 100 according to the present invention is provided with a body (110). One side of the body 110 is provided with a nonwoven fabric support 111 to allow the nonwoven 105 to be supplied. A plurality of feed rollers 113 for continuously feeding the nonwoven fabric 105 along a predetermined path toward the front side of the nonwoven fabric support 111 are arranged in the form as shown. One side of the body 110 is provided with a porous material injection means 120, which may be filled with a mixture of diatomaceous earth, activated carbon, carbon in a predetermined ratio or only one of them alone. Of course, when the porous material is already added during the nonwoven fabric manufacturing process as described with reference to FIG. 2, the porous material injection means 120 is not necessary. The porous material injection means 120 is adsorbed between the pores of the nonwoven fabric 105 to prevent the pores of the nonwoven fabric to filter out even finer particles. Of course, the porous material injection means 120 can be changed to other forms in some cases. For example, a method of allowing the nonwoven fabric 105 to pass through the container in which the porous porous material 122 is stored may be used.

On one side of the body 110, the winding roller supply means 130 is installed to be inclined at a predetermined angle, and the pressing means 140 and a pair of driving rollers 150 and 152 are adjacent to each other. As can be seen in Figure 4, the winding roller supply means 130 is a tubular body 131 is formed with an inclined guide path 132 to allow a plurality of winding rollers 160 are arranged in order to be supplied by gravity Equipped with. As shown in FIG. 4, the inclined guide path 132 is formed in this tubular body 131, The elevating mechanism 134 for elevating the winding roller 160 is provided in one side. In addition, a pair of preheating rollers 135 are disposed facing the outlet. The pre-rolling roller 135 is heated to rotate the take-up roller 160 as a part of the feature of the present invention so that the entire surface of the take-up roller 160 in the form of a pipe can be evenly preheated to about 80 ° C. Since the entire surface of the take-up roller 160 is uniformly preheated, the inner circumferential surface of the nonwoven fabric filter 107 wound around the winding roller 160 is smoothly formed. The preheat roller 135 on one side is connected to the cylinder mechanism 136 to allow the preheated take-up roller 160 to fall on the lower driving rollers 150 and 152 at a predetermined time.

The driving rollers 150 and 152 are intended to mount and rotate the take-up rollers 160 supplied from the take-up roller supply means 130, the cross section of which is shown in FIG. Here, the driving rollers 150 and 152 on one side may be adjusted to be spaced through the transfer mechanism 154.

Pressing means 140 is to press the winding roller 160 is rotated while winding the nonwoven fabric 105 to fall on the driving rollers (150, 152), a role that allows the nonwoven fabric 105 to be wound very tightly In this case, a cylinder mechanism provided with a roller 144 at the end of the rod 142 may be used.

Next to the driving roller 152, a forming roller 170 as shown in Fig. 6 is disposed. The shaping roller 170 is for forming irregularities on the surface of the nonwoven fabric 105 wound around the winding roller 160, and the threaded irregularities 172 are formed on the surface thereof. This forming roller 170 is also good to be able to adjust the interval with the neighboring drive roller 152 through the transfer means (173). A pressurizing mechanism 175 is further provided to press the nonwoven fabric 105 wound on the winding roller 160 thereon. This is to facilitate the formation of irregularities on the surface of the nonwoven fabric.

The need to apply heat, such as the driving rollers (150, 152) and the forming rollers (170) should be supplied with power, as can be seen in Figure 3 to install a slip ring 157 at one end It is necessary to heat the necessary rollers by connecting the connector 158 which is elastically contacted, and the rotational power may be provided to receive power by installing pulleys or other sprockets at opposite ends thereof.

On one side of the driving rollers 150 and 152, a pusher 180 is provided to push the winding roller 160 in a state in which the nonwoven fabric 105 is completely wound, and the forming roller 170 and the driving roller 152 are provided. Cutting means 190 is installed on the upper one side between). The cutting means 190 is for cutting the nonwoven fabric 105 after the nonwoven fabric 105 is completely wound. The cutting means 190 may use a heating wire that can be elevated, which will be described in more detail later with reference to FIG. 7.

In some cases, a heating means 200 for heating the nonwoven fabric 105 supplied to the take-up roller 160 may be provided so that the nonwoven fabric 105 may be wound more tightly. Each roller may be driven by a pulley 101 and a belt 102 so as to be rotated through a reducer or the like by receiving the power of the motor 103. Other chains or gears may be used.

That is, the nonwoven fabric 105 is supplied along the predetermined path by the feed roller 113. Of course, at first the end of the nonwoven fabric 105 must be artificially positioned on the winding roller supply means 130, the lower driving rollers (150, 152). In the process of supplying the nonwoven fabric 105, the porous material 122, such as powdered diatomaceous earth, is injected onto the nonwoven fabric 105 by the porous material injection means 120, and heated by the heating means 200.

On the other hand, the take-up roller 160 is arranged in order along the inner inclined guide path 132 of the take-up roller supply means 130, after the pre-heating process in the pre-rolling roller 135, so that one side of the pre-rolling roller 135 is reversed The lowermost one is supplied onto the nonwoven fabric 105 disposed above the drive rollers 150 and 152.

Accordingly, the nonwoven fabric 105 is adhered to the surface of the take-up roller 160, and when the driving rollers 150 and 152 rotate the take-up roller 160 in that state, the nonwoven fabric 105 is wound around the take-up roller 160. . In this state, the nonwoven fabric 105 wound around the take-up roller 160 is pressed to a predetermined pressure by using the pressing means 140.

After the nonwoven fabric 105 is sufficiently wound on the take-up roller 160, the take-up roller 160 is pushed by the pusher 180 to move the take-up roller 160 toward the forming roller 170. At the same time, the cutting means 190 is lowered to cut the nonwoven fabric 105 by heat, and the forming roller 170 is a nonwoven fabric 105 that is wound around the winding roller 160 together with the pressing mechanism 175, that is, a nonwoven filter. If irregularities are formed on the surface of 107, and the nonwoven filter 107 is separated using a predetermined hydraulic mechanism or the like, one long nonwoven filter 107 is completed. Then, the winding roller 160 in the form of a pipe is raised and supplied again by the lifting mechanism 134, and undergoes a preheating process.

That is, the nonwoven filter can be continuously made without stopping the nonwoven filter manufacturing apparatus. In addition, since the nonwoven fabric is wound in a pressing state by the pressurizing mechanism, the nonwoven fabric is tightly wound to provide excellent filtration performance, and powder diatomaceous earth, activated carbon, and carbon are disposed on the nonwoven fabrics, and thus the performance is more excellent.

5 is a sectional view of a driving roller, and FIG. 6 is a sectional view of a forming roller.

As can be seen in Figure 5, there is an empty space formed inside the drive rollers 150, 152 and the forming roller 170, it is good to insert a heater to heat it, Figure 6 forming roller ( It is preferable to form a thread-shaped unevenness 172 on the surface of 170.

7 is a view for explaining the cutting means.

As shown in FIG. 7, the cutting means 190 includes a cylinder mechanism 194 having a rod 192, a guide 195, a heating wire 196, a rod 192, and a heating wire 196 provided at an end of the rod 192. It consists of an elastic member 197 provided between. This is to prevent the hot wire from being impacted by the driving roller or the like when cutting the nonwoven fabric.

8 is a view showing another example of a nonwoven filter manufacturing apparatus according to the present invention.

As shown in FIG. 8, the nonwoven fabric 105a is supplied to the nonwoven fabric 105 which is supplied along the path of one side, and is bonded to the nonwoven fabric 105a in a double way by using the heater 202 and the pressure roller 113a, and then the winding roller ( When configured to be wound around 160, the performance of the manufactured nonwoven filter is further improved. The rest is as described above.

9 is a perspective view of a nonwoven filter according to the present invention, and FIG. 10 is a sectional view taken along the line of FIG. 9 I-I.

As shown, the nonwoven filter 107 according to the present invention has a substantially cylindrical shape, and the concave-convex 108 is formed on the surface thereof. This unevenness 108 is to make the nonwoven fabric filter 107 adhere to the wall surface of the case into which the nonwoven fabric filter 107 is inserted so that impurities do not pass between the wall surfaces of the case. As shown in FIG. 9, the porous material 122 is adsorb | sucked to the nonwoven fabric filter 107 in the state of powder multiple layers in multiple layers.

11 to 14 are enlarged photographs of the water-soluble grinding liquid, and FIG. 11 is an eyepiece magnification of 10 and an objective lens magnification of 5, a scale of 1 is 28.4 μm, and FIG. 12 is an eyepiece magnification of 10 and an objective lens. A magnification of 10, that is, magnification of 100 times, is 14.2 μm in one scale, indicating that the water-soluble grinding liquid contains many impurities. FIG. 13 is a 200 times magnified picture of 7.1 μm in one scale, and FIG. 14 is a 400 times magnification of a picture of 3.55 μm, with larger particles of impurities. If such an impurity is contained in the grinding liquid, it goes without saying that the precision of the workpiece due to the grinding process is poor.

15 to 18 are enlarged photographs of the water-soluble grinding liquid after filtration with a nonwoven filter produced according to the method of the present invention using diatomaceous earth of # 900 as a porous material.

FIG. 15 is a 50 times magnification of an aqueous grinding liquid filtered with a non-woven filter manufactured according to the present invention, that is, an eyepiece magnification of 10 and an object lens magnification of 5, that is, a magnification of 28.4 μm. In the state rarely found, Figure 16 is a 100 times the water-soluble grinding liquid after the filtration process, Figure 17 is 200 times, and Figure 18 is enlarged 400 times, respectively, the remarkable size impurities 1 to 2 I can only look it up. That is, the nonwoven filter according to the present invention is very excellent in its performance.

19 is a graph showing the filtration rate of the nonwoven filter according to the present invention using diatomaceous earth as a porous material.

In Figure 19, the horizontal axis represents the filtration time in minutes, and the vertical axis represents the volume of the filtrate in liters. As can be seen in Figure 19 it can be seen that as the particle size of the diatomaceous earth is increased from # 100 to # 900, the filtration volume also increases, and in the case of increasing more than that, for example, # 1100, the filtration rate decreases. Able to know. That's the best performance in the # 900.

As can be seen from the above description, the nonwoven filter according to the present invention, the manufacturing method and the apparatus thereof can continuously produce the nonwoven filter without interrupting the apparatus, thereby greatly improving the production efficiency, and improving the diatomaceous earth, activated carbon, Due to carbon, the filtration performance of the nonwoven filter itself is also improved, and the performance is further improved when the double adhesive method is used. In addition, since the pre-roller rotates the take-up roller to uniformly preheat the entire surface thereof, the inner circumferential surface of the nonwoven filter wound around it is also formed uniformly and smoothly, thereby improving performance.

Claims (14)

In the nonwoven fabric manufacturing method, Conveying the nonwoven fabric along a predetermined path; Preheating the take-up roller for winding the nonwoven fabric; Winding the nonwoven fabric on the winding roller after the preheating process; Pressing the nonwoven fabric wound on the winding roller; Cutting the nonwoven fabric; And Nonwoven filter manufacturing method comprising the step of leaving the winding roller. The method of claim 1, further comprising coating a porous material on the conveyed nonwoven fabric. The method of claim 1, further comprising adding a porous material during the manufacturing process of the nonwoven fabric. The method of claim 2 or 3, wherein the porous material comprises at least one of powdered diatomaceous earth, activated carbon, and carbon. The method of claim 1, wherein the preheating step is performed by rotating the take-up roller mounted on a predetermined preheat roller. The method of any one of claims 1 to 3, wherein the nonwoven fabric is supplied to the conveyed nonwoven fabric along a predetermined path, the two nonwoven fabrics are heated, and the two nonwoven fabrics subjected to the heating step are pressurized to be joined. Nonwoven filter manufacturing method characterized in that it further comprises the step of. The method for manufacturing a nonwoven fabric filter according to any one of claims 1 to 3, further comprising the step of forming irregularities on the surface of the nonwoven fabric wound on the winding roller. In the nonwoven filter manufacturing apparatus for manufacturing a nonwoven filter using a nonwoven fabric, A plurality of feed rollers for continuously supplying the nonwoven fabric along a predetermined path; A nonwoven winding roller for winding the supplied nonwoven fabric; Winding roller supply means for preheating the winding rollers and supplying them in sequence; A driving roller for mounting and rotating the supplied winding roller; Pressing means mounted on the driving roller to press the winding roller rotated while winding the nonwoven fabric; And And a cutting means for cutting the nonwoven fabric after the nonwoven fabric is completely wound. 9. The nonwoven fabric filter manufacturing apparatus according to claim 8, further comprising a porous material spraying means for coating a porous material on the conveyed nonwoven fabric and a heating means for heating the nonwoven fabric wound on the winding roller. According to claim 8, The winding roller supply means is installed on the lower end of the inclined guide passage and the tubular body formed with the inclined guide path which can be supplied by the plurality of winding rollers are arranged in order to rotate the take-up roller Non-woven filter manufacturing apparatus characterized in that it comprises a pre-roller to preheat while. The forming roller and the winding roller according to any one of claims 8 to 10, wherein the winding roller on which the nonwoven fabric is wound is mounted and rotated so as to form irregularities on the surface of the nonwoven fabric. Nonwoven fabric filter manufacturing apparatus further comprises a pressing mechanism for pressing the wound nonwoven fabric. The nonwoven fabric filter manufacturing apparatus according to any one of claims 8 to 10, further comprising a heater and a pressure roller for supplying another nonwoven fabric to the supplied nonwoven fabric and adhering it in a double bond. The method according to any one of claims 8 to 10, The cutting means is a non-woven filter manufacturing apparatus characterized in that it comprises a cylinder mechanism having a rod and an elastic member provided between the rod and the heating wire. In the nonwoven filter, A nonwoven fabric filter comprising a cylindrical body formed by winding a nonwoven fabric and a porous material adsorbed by the nonwoven fabric to densely block pores of the nonwoven fabric.