WO2001052969A1 - Filtre cylindrique et son procede de fabrication - Google Patents

Filtre cylindrique et son procede de fabrication Download PDF

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Publication number
WO2001052969A1
WO2001052969A1 PCT/JP2000/000292 JP0000292W WO0152969A1 WO 2001052969 A1 WO2001052969 A1 WO 2001052969A1 JP 0000292 W JP0000292 W JP 0000292W WO 0152969 A1 WO0152969 A1 WO 0152969A1
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WIPO (PCT)
Prior art keywords
melt
nonwoven fabric
blown
filter
fibers
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PCT/JP2000/000292
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English (en)
Japanese (ja)
Inventor
Shigenori Fukuda
Osamu Yamaguchi
Daisuke Masuda
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Chisso Corporation
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Publication date
Application filed by Chisso Corporation filed Critical Chisso Corporation
Priority to PCT/JP2000/000292 priority Critical patent/WO2001052969A1/fr
Publication of WO2001052969A1 publication Critical patent/WO2001052969A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded

Definitions

  • the present invention relates to a cylindrical filter and a method for producing the same, and particularly relates to a cylindrical filter suitable for liquid filtration and a method for producing the same.
  • Nonwoven fabrics have long been used as filter materials for liquids and gases because of their excellent workability.
  • nonwoven fabrics manufactured from thermoplastic resins such as polypropylene as raw materials are inexpensive and can easily change the diameter of the fibers constituting the nonwoven fabric and the thickness of the nonwoven fabric. It is suitably used for
  • nonwoven fabrics manufactured by the meltblowing method can reduce the fiber diameter as compared with nonwoven fabrics manufactured by other manufacturing methods. Therefore, various filtration accuracy and filters of filtration life using the nonwoven fabrics are being studied.
  • the melt blow method of directly forming a thermoplastic resin into a nonwoven fabric has a drawback that it is difficult to adjust the fiber orientation of the nonwoven fabric. Therefore, proposals have been made to further improve this.
  • Japanese Patent Application Laid-Open No. Hei 6-222 064 discloses that a heated meltblown nonwoven web is tensioned while being heated to orient the fibers of the nonwoven fabric in one direction, thereby improving the permeation of particles.
  • a manufacturing method for processing a nonwoven fabric having a reduced resistance is disclosed.
  • Japanese Patent Application Laid-Open No. 8-224124 discloses that a collection drum for collecting spun melt-blown fibers is provided with a rotation center in a horizontal direction from a vertical direction below a base of the melt-blowing device. By displacing the melt blown fiber at the collection point of the collection drum on which the fiber sheet is placed, the melt blown fiber is collected at a relatively small fiber orientation angle.
  • a method for producing a laminated composite nonwoven fabric with a fiber sheet is disclosed. In this manufacturing method, the angle of melt-blowing with respect to the collection drum is relatively small, so that the orientation direction of the melt-blown fibers in the nonwoven fabric can be within ⁇ 35 degrees with respect to the flow direction of the air-permeable fiber sheet.
  • a nonwoven fabric having improved nonwoven foldability and rigidity can be obtained.
  • the melt-blown non-woven fabric obtained by this method causes a reduction in liquid permeability because the fibers are crushed by a single calender. Also, with this manufacturing method, it is difficult to uniformly stretch the melt-blown nonwoven fabric. Therefore, when the obtained non-woven fabric is used as a filter, it can be easily expected that the non-woven fabric has problems in liquid permeability and uniformity.
  • Japanese Patent Application Laid-Open No. 11-504845 discloses a high-temperature fiber from a melt-blowing die that can maintain a sufficiently molten state.
  • Collection Z are collected on a transfer roller, and the fibers are adhered to a melt-blown fiber mass discharged from another melt-blowing die while being in a softened state or a molten state, and then wound up and uniformly.
  • a method is disclosed for producing a filter that withstands pressure by mixing. The feature of this manufacturing method is that the fiber on the collection Z transfer roller This is where the other fibers are bonded in a softened or molten state.
  • the role of the collecting roller is to maintain the softened or molten state of the fiber and at the same time prevent the interference of air from other meltblowing dies.
  • this method has an effect of increasing the strength of the molded body simply by mixing thick fibers into the molded body, and does not solve the problem of the melt-blown nonwoven fabric.
  • the melt-blown nonwoven fabric manufactured by the normal manufacturing method has an average degree of orientation of 30 degrees or more even when the fibers are generally randomly oriented. It is not possible to make nonwovens that are arranged in the circumferential direction.
  • the methods described in Japanese Patent Application Laid-Open Nos. Hei 6-222704, Hei 8-22424, and Hei 1-150375 are described. Although it can be used, it is possible that the performance of the final filter product will not be sufficient due to the problems described above.
  • Fibers manufactured using the spunbond method tend to be originally oriented in the direction of conveyor movement during manufacture (hereinafter referred to as the MD direction). Can make a nonwoven fabric oriented in one direction.
  • the spunbond method the fiber bundle after solidification or semi-solidification of the fiber is stretched in the same way as ordinary melt spinning, so it is difficult to make the fiber diameter extremely small. Because measures are required, advanced technology is required.
  • An object of the present invention is to provide a cylindrical filter which realizes a low water flow resistance of the filter, which is a problem of the above-described conventional technology, and further has an improved filtration life.
  • the present inventors have conducted intensive research to solve the above-mentioned problems, and as a result, by adopting the following configuration, the prospect of achieving the intended purpose has been obtained, and the present invention has been completed. Disclosure of the invention
  • the present invention has the following configuration.
  • a cylindrical filter formed by winding a non-woven fabric in a circumferential direction in a layered manner. At least one layer of the non-woven fabric has a melt blown angle having an average orientation angle of 30 degrees or less with respect to the circumferential direction of the cylindrical filter.
  • a cylindrical filter characterized by being a meltblown nonwoven fabric made of fiber.
  • melt-blown nonwoven fabric is composed of a composite fiber or a mixed fiber composed of at least two kinds of thermoplastic resins having a melting point difference of 10 ° C or more.
  • the tubular filter is composed of at least two layers of nonwoven fabrics having different average orientation angles, one layer is the melt-blown nonwoven fabric, and the other layer has a thickness of 35% with respect to the circumferential direction of the cylindrical filter. 5.
  • melt blown fiber In the manufacturing method of melt blown fiber, spinning nozzle and A substantially air-impermeable collection device having a temperature lower than the melting point of the thermoplastic resin to be melt-blown is provided between the suction device and the suction device for collecting the fibers, and the melt-blown fibers are melt-blown on the collection device.
  • a method for producing a cylindrical filter characterized in that a melt-blowing non-woven fabric is produced by repeating the steps of melt-blowing, and the obtained melt-blown non-woven fabric is wound in layers in the circumferential direction to form a cylindrical filter.
  • FIG. 1 is a schematic view showing an example of a manufacturing apparatus for a melt blown nonwoven fabric used in the present invention.
  • the fiber direction is arranged in the circumferential direction of the tubular filter.
  • This is a cylindrical filter manufactured by using a melt-blown nonwoven fabric made of melt-blown fibers obtained by using a row of thermoplastic resins as a raw material, and winding this in the circumferential direction.
  • the tubular filter of the present invention may be composed of one layer of melt-blown nonwoven fabric, or may be composed of at least two layers of meltblown nonwoven fabric.
  • a filter made of a nonwoven fabric when particles to be filtered are collected in an opening made of fibers, even if the area of the opening to be collected is the same, the particle shape depends on the shape of the opening.
  • the permeability is different, and the permeability of the particles is best when the shape of the opening is a perfect circle, and the trapping performance is considered to have the opposite tendency.
  • the openings formed by the fibers are elongated. (Slit form). Therefore, when the fiber direction of the nonwoven fabric is oriented in one direction, the maximum collection particle size (when the fiber aggregate layer is Particles of the maximum diameter that can be collected at 100 ° / 0 ). In other words, if a nonwoven fabric with the same maximum passage particle size is made, a unidirectional orientation of the fiber direction of the nonwoven fabric will result in a higher open area than randomly dispersed fibers. It is possible to state.
  • the water flow resistance depends on conditions such as the Reynolds number, but depends greatly on the aperture area.Therefore, when fabricating a nonwoven fabric with the same maximum collection particle size, Orientation at a higher temperature improves water permeability than dispersion at random. This is why the tubular filter of the present invention is excellent in water permeability.
  • the method of orienting the fiber direction of the nonwoven fabric in one direction must be a method capable of arranging the average orientation angle of the fibers at 30 degrees or less with respect to the circumferential direction. Examples of such a production method include a spun bond method and a melt blow method in which a nonwoven fabric is obtained directly from spinning.
  • the card method, the air laid method, the needle punch method, and the ⁇ ⁇ jet method, etc., which make the nonwoven fabric can be used.
  • the fiber direction is oriented in one direction by applying these methods.
  • the melt blow method is particularly preferably used.
  • a substantially air-impermeable collection device that is lower than the melting point of the thermoplastic resin to be melt-blown on the suction device is installed, and melt-blown on the non-air-permeable collection device.
  • a nonwoven fabric in which the fiber direction of the melt-blown fibers can be oriented in one direction and the fibers are firmly bonded to each other can be obtained.
  • the melt-blown fibers are oriented in the circumferential direction of the cylindrical filter, and the average orientation angle of the melt-blow fiber is 30 degrees with respect to the circumferential direction.
  • a cylindrical filter oriented as follows is obtained.
  • the apparatus shown in FIG. 1 can be used as an apparatus for producing this melt blown nonwoven fabric.
  • a conventional melt nozzle can be used as the spinning nozzle 1.
  • a hole having a diameter of 0.2 to 1.0 mm is arranged in a line at least 0.5 mm apart from an adjacent hole. They are arranged side by side, and hot air is blown out from a slit provided in parallel with the nozzle hole row to melt-blow.Spinning nozzles that can produce melt-blown fibers are particularly limited. Not done.
  • a collection device 2 having substantially no air permeability is provided under the spinning nozzle 1, a collection device 2 having substantially no air permeability is provided.
  • the collecting device 2 is preferably a rotatable one.
  • a rotating cylindrical body having a smooth surface, a rotary moving conveyor having a smooth surface, and the like are suitable as the collecting device.
  • Fig. 1 shows an example of a rotating cylinder having a smooth surface.
  • the function of the collecting device 2 is to collect the fibers melt-blown from the spinning nozzle 1 before the fibers are not sufficiently solidified, and to collect the fibers.
  • the purpose of the present invention is to smooth the surface of the nonwoven fabric on the collection device side, cool the nonwoven fabric, and firmly bond the fibers to each other. Therefore, the surface of the trapping device 2 must be smooth.
  • the surface of the collecting device 2 is subjected to a treatment such as a fluororesin processing. Then, the collected nonwoven fabric is separated from the collection device 2 and then transferred to a suction device 4 (this includes a suction conveyor, a suction drum, etc.
  • a suction device 4 this includes a suction conveyor, a suction drum, etc.
  • FIG. 1 shows an example of a suction conveyor. It is. At this time, the collected nonwoven fabric needs to be solidified before it is separated from the collecting device 2, and the collecting device 2 tends to be heated by the heat received from the melt blown fiber. It is preferred that the collector 2 be actively cooled.
  • a method of passing a coolant such as water or air into the inside of the collecting device 2 can be exemplified.
  • the temperature of the collecting device 2 depends on the type of the thermoplastic resin used as the raw material of the meltblown fiber and the production rate of the nonwoven fabric. For example, when the thermoplastic resin is polypropylene, the temperature is from 20 ° C to 70 ° C. ° C is appropriate.
  • the nonwoven fabrics obtained by using the trapping device 2 a part of the fiber cross-sectional shape on the surface of the nonwoven fabric that has been in contact with the trapping device 2 is close to a semicircle and smooth. For this reason, this nonwoven fabric has a structure with many holes even on the smoothed surface, and since it has excellent liquid permeability despite its small bulk, it is used as a filter medium for a filter. It becomes suitable.
  • the surface condition of the nonwoven fabric can be adjusted. In this case, two or more non-woven fabrics having different surface conditions can be prepared in the same step by preparing two or more collecting devices having different surface conditions.
  • the fibers of the nonwoven fabric compressed by the calender roll are closed by the compressed fibers, so that the pressure loss increases as a filter medium of the filter, and the present invention It is not preferable when compared with the melt blown nonwoven fabric used in the present invention.
  • the fibers are directly collected on the suction device, so that the flow of the melt blow air is perpendicular to the suction device, and the melt blow air has little effect on the orientation of the fibers.
  • the fibers of the nonwoven fabric are hardly oriented.
  • the nonwoven fabric produced by the melt blow method of the present invention is a nonwoven fabric having a fiber orientation.
  • the degree of fiber orientation can be changed by adjusting the angle at which the melt blown fibers hit the collection device 2 (ie, the angle at which the melt blown air hits the collection device 2).
  • the method of stretching a melt-blown nonwoven fabric to orient the fibers there is a limit to the fiber orientation angle that can be achieved depending on the physical properties of the nonwoven fabric before stretching.
  • melt-blown nonwoven fabric examples include polypropylene, polyethylene, poly (4-methylpentene), a binary or ternary copolymer of propylene with another ⁇ -olefin, and polyethylene terephthalate.
  • thermoplastic resins such as polybutylene terephthalate, polyamide, and polycarbonate.
  • a combination of a high-melting resin and a low-melting resin is appropriately selected from the above thermoplastic resins to obtain a composite fiber such as a parallel type, a sheath-core type, an eccentric type, or a high-melting point resin.
  • Fiber and low-melting resin fiber may be mixed or mixed.
  • fibers consisting of high-melting resin and low-melting resin and heating when forming the filter only the low-melting resin is melted and the fibers are bonded together by heat.
  • a cylindrical filter with high and stable filtration accuracy can be obtained.
  • High melting point resin and low melting point resin are combined so that the difference in melting point is 10 ° C or more, preferably 15 ° C or more.
  • the ratio (composite ratio or blend ratio) of the high melting point resin to the low melting point resin is preferably in the range of 80:20 to 20:80.
  • the number of heat bonding points decreases, and the shape retention decreases.
  • the ratio of the high melting point resin to the low melting point resin is more preferably in the range of 70:30 to 30:70.
  • the fiber diameter of the melt blown fibers constituting the melt blown nonwoven fabric is appropriately selected according to the filtration accuracy.
  • the nonwoven fabric has two or more layers, it is preferable to use a fiber having a larger fiber diameter in the upstream layer than in the downstream layer when viewed from the flow direction of the filtrate.
  • the cross section of the fiber may have a circular or irregular cross section, and it is preferable to use the irregular cross section yarn because the filtration area can be increased and the filtration accuracy can be improved. Further, two or more kinds of fibers having different fiber diameters may be mixed or mixed.
  • the average orientation angle of the melt blown fibers constituting the melt blown nonwoven fabric is desirably 30 degrees or less. If this angle exceeds 30 degrees, the width of the slit-like opening formed by the meltblown fiber becomes wider, the ability to collect fine particles is reduced, and the nonwoven fabric having a low fiber orientation angle is formed. That is, the difference in performance from ordinary melt-plow nonwoven fabric) is reduced.
  • the porosity of the melt-opening nonwoven fabric used in the present invention is preferably 65 to 72% from the viewpoint of liquid permeability and the like.
  • An excellent filter can be obtained by using the melt-blown non-woven fabric made in this way in the form of a sheet, but this melt-blown non-woven fabric is wound into a tubular shape to form a tubular filter, and the fibers are wound in the circumferential direction of the tubular filter. Orientation at a higher temperature can make better use of the characteristics.
  • a melt-blown non-woven fabric may be wound around a core or the like, or a core-free filter may be obtained by winding the core while heating it to an appropriate core and then removing the core. ,.
  • This method for example, The method described in No. 31 can be used.
  • the filter of the present invention a structure comprising two or more layers of nonwoven fabric, various properties can be imparted.
  • the filter of the present invention is excellent in water permeability by using a melt blown nonwoven fabric having a larger maximum particle size than the inner layer portion for the outer layer portion. Not only that, it can extend the filtration life. In general, it is often easier to make a meltblown nonwoven fabric with a larger maximum particle size than to make a meltblown nonwoven fabric with a smaller maximum particle size. In addition, since the pressure loss of the filter is almost determined in the inner layer where the maximum trapped particle size is small, the influence on the pressure loss is small even if a melt-blown nonwoven fabric produced by a conventional method is used in the outer layer.
  • the pressure loss in the outer layer should be low. Therefore, for the outer layer portion, for example, a nonwoven fabric obtained by a usual melt blow method, that is, a nonwoven fabric in which fibers are randomly dispersed can be used. Alternatively, it can be made of a fiber having a larger fiber diameter than the inner layer. This thick fiber may be made thicker by changing the spinning conditions with the inner layer, or may be made in a separate process. If it is made in a separate process, a spinning method different from that for the inner layer (for example, a combination of a melt blow method for the inner layer and a spunbond method for the outer layer) may be used.
  • two or more layers can be formed by preparing two or more collecting devices having different surface states and winding up two or more types of nonwoven fabric having different surface states. Further, these methods may be used in combination.
  • the nonwoven fabric used for the outer layer portion has an average orientation angle of the fibers of preferably 35 to 65 degrees, so that the pores formed by the fibers can be formed. It becomes closer to a circle and collects particles with a large particle size. At the same time, the pore diameter slopes from the inner layer to the outer layer. It is preferable because it can be arranged and has an effect of extending the filtration life. At this time, by increasing the porosity of the outer layer portion of the cylindrical filter by 5 to 15% from the value of the inner layer portion, a space for collecting coarse particles is widened and the filtration life is further extended.
  • the filtration life is further extended by the effect of the porosity gradient, and when it is 15% or less, coarse particles are sufficiently collected in the outer layer portion, and as a result, the inner layer portion is obtained.
  • the filtration life will be significantly longer because only one particle will not be trapped.
  • the weight ratio between the inner layer and the outer layer is preferably in the range of 1:20 to 20: 1. If this range is greatly deviated, the performance as a filter using two layers of nonwoven fabrics having different average orientation angles may not be sufficiently exhibited.
  • a porous cylinder is used as the winding core of the nonwoven fabric, and is oriented in the MD direction on this, that is, the orientation angle is arranged at 30 degrees or less with respect to the circumferential direction.
  • the non-woven fabric composed of a fiber layer having an orientation angle of 35 to 65 degrees with respect to the circumferential direction is adjusted so that the porosity is 5 to 15% higher than that of the inner layer. Wind and fix the end of the winding with heat seal or hot melt adhesive to prevent peeling.
  • the fiber By winding the fiber oriented in the MD direction in the circumferential direction of the filter along the MD direction, the fiber is significantly oriented in the circumferential direction of the filter. It is not necessary to make a two-layer filter using one type of nonwoven fabric for each of the inner layer and outer layer. The average orientation angle is close to 45 degrees as the outer layer is reached, the fiber diameter is large, and the porosity is small. By winding a combination of nonwoven fabrics with different fiber orientations, different finenesses, and different porosity, the two-layer structure with various changes becomes more than two layers. Life can be further improved. When a structure with three or more layers is used, It is desirable to wind the nonwoven fabric so that the porosity of the outermost layer is 5 to 15% higher than the minimum porosity.
  • the non-woven fabric is passed through a far-infrared ray heater or an air-through dryer to heat it to a temperature at which the low-melting point component is melted, and then wound around a porous cylinder.
  • a coreless filter can also be made by winding a metal pipe instead of a porous cylinder and then extracting the metal pipe.
  • the above-mentioned flat plate, rotating cylinder or rotary moving conveyor is installed between the spinning nozzle and the suction conveyor, and these devices are moved at regular intervals so that the fiber is oriented in the MD direction.
  • Continuous production of non-oriented non-woven fabric, and interlocking with this, continuously linking the non-woven non-woven fabric with a cylindrical filter winding device can produce a highly productive filter manufacturing device.
  • the bulk of the nonwoven fabric is adjusted by changing the suction pressure of the suction / suction of the suction / contraction of the net of the suction conveyor, the porosity of the outer layer of the filter can be increased.
  • a gradient of the fiber diameter can be provided, and a filter having a better filtration life can be manufactured.
  • An electron microscope image of the fibers that make up the nonwoven fabric is taken into an image processing device, and the angle between the MD direction and the line connecting the 1 mm fiber length axis with a straight line for any 100 fibers is 0 to 9 degrees. The measurement was performed in the range of 0 degrees, and the average value of all angles was defined as the average orientation angle.
  • the filter was attached to the housing, ACFTD was added at a flow rate of 30 liters per minute, ACFTD was added at 0.5 g Z minute, and the housing inlet side And the pressure difference between the outlet side. The time until the differential pressure showed 0.2 MPa was defined as the filtration life.
  • the melt-blown nonwoven fabric was wound around a polypropylene porous cylinder having an inner diameter of 30 mm and an outer diameter of 34 mm to produce a cylindrical filter having an inner diameter of 30 mm, an outer diameter of 68 mm, and a length of 250 mm. Table 1 shows the measurement results.
  • the obtained tubular filter had low water flow resistance and excellent filtration life.
  • Example 2 Using the same melt spinneret for spinneret and resin as in Example 1, extruded at a spinning temperature of 290 ° C and blown heated air at 360 ° C at a pressure of 0.06 MPa, The converted fibers were collected on a suction conveyor net to produce a nonwoven fabric with a basis weight of 50 gZm 2 .
  • the obtained nonwoven fabric had an average fiber diameter of 14.7 m and an average orientation angle of 41 degrees.
  • the nonwoven fabric was wound around a porous cylinder to an outer diameter of 58 mm by the same manufacturing method as in Example 1, and then the spunbonded nonwoven fabric obtained in Example 1 was wound thereon to have an outer diameter of 68 mm.
  • Example 1 a cylindrical filter having an inner diameter of 30 mm, an outer diameter of 68 mm and a length of 250 mm was obtained from the nonwoven fabric by the same manufacturing method as in Example 1. Table 1 shows the measurement results.
  • the obtained tubular filter had higher water flow resistance and shorter filtration life than the tubular filter of Example 1.
  • the fine fibers are blown at 17a and deposited on the surface of a stainless steel rotating cylinder with an outer diameter of 120 mm placed under the nozzle and parallel to the nozzle, and then collected on a suction conveyor net.
  • a melt-blown nonwoven fabric having a basis weight of 40 g / m 2 was produced.
  • the obtained melt blown nonwoven fabric had an average fiber diameter of 5.1 ⁇ m and an average orientation angle of 17 degrees.
  • spinning is performed under the same manufacturing conditions as above, and is deposited near the center from the deposition position on the surface of the rotating cylinder, and then collected on a suction conveyor net, and a melt blown weight of 40 g Zm 2 is applied.
  • a non-woven fabric was manufactured.
  • the resulting meltblown nonwoven fabric has an average fiber diameter of 5.
  • the average orientation angle was 26 degrees.
  • Example 1 A 50 mm, cylindrical filter was manufactured. Table 1 shows the measurement results. The obtained tubular filter had lower water flow resistance than that of Example 1, and had excellent filtration life.
  • Example 2 Using the same spinneret and thermoplastic resin as in Example 1, extruded at a spinning temperature of 290 ° C, heated air at 380 ° C was blown at a pressure of 0.12MPa, and it was refined. The collected fibers were directly collected on a suction conveyor net to produce a melt-blown nonwoven fabric having a basis weight of 40 gm 2 . The resulting melt blown nonwoven fabric had an average fiber diameter of 4.3 ⁇ m and an average orientation angle of 42 degrees.
  • Example 3 the melt blown nonwoven fabric was wound around a polypropylene porous cylinder having an inner diameter of 3 O mm and an outer diameter of 34 mm, and an inner diameter of 30 mm, an outer diameter of 68 mm, and a length of 250 mm. mm, a cylindrical filter was manufactured. Table 1 shows the measurement results. The obtained cylindrical filter had higher water flow resistance and a shorter filtration life than Example 1. (Example 3)
  • polypropylene (MFR 45 gZlO content (230 ° C), mp. 165 ° C) was spun at a spinning temperature of 290 °.
  • C. 380 ° C heated air is blown at a pressure of 0.1 MPa, and the fine fibers are placed on the surface of a stainless steel rotating roll with an outer diameter of 120 mm installed parallel to the nozzle below the nozzle.
  • the resulting melt blown nonwoven fabric had an average fiber diameter of 8.4 ⁇ m and an average orientation angle of 20 degrees.
  • the stainless steel rotating roll was moved to directly collect the fibers on a suction conveyor net, thereby producing a melt-blown nonwoven fabric having a basis weight of 40 gZm 2 .
  • the resulting melt blown nonwoven fabric had an average fiber diameter of 8. and an average orientation angle of 41 degrees.
  • the obtained nonwoven fabric is wound around a polypropylene porous cylinder having an inner diameter of 30 mm and an outer diameter of 34 mm, and the outer diameter of the inner layer is about 58 mm and the outer diameter of the outer layer is 69 mm. mm, an outer diameter of 69 mm, a length of 250 mm, and a cylindrical filter were manufactured. Table 1 shows the measurement results.
  • the obtained cylindrical filter had low water flow resistance and excellent filtration life.
  • the extruded fiber was extruded at a spinning temperature of 290 ° C, and heated air at 380 ° C was blown at a pressure of 0.12 MPa to reduce the fine fiber. It was directly collected on a suction conveyor net to produce a melt-blown nonwoven fabric having a basis weight of 40 g Zm 2 .
  • the resulting melt blown nonwoven fabric had an average fiber diameter of 4.3 m and an average orientation angle of 42 degrees.
  • the melt blown nonwoven fabric was wound around a polypropylene porous cylinder having an inner diameter of 30 mm and an outer diameter of 34 mm, and an inner diameter of 30 mm, an outer diameter of 68 mm and a length of 2 A 50 mm, cylindrical filter was manufactured.
  • Table 1 shows the measurement results.
  • the obtained cylindrical filter had higher water flow resistance and a shorter filter life than Example 3.
  • a high melting point component spin hole with a 0.3 mm pore diameter and a low melting point component spin hole with a 0.3 mm hole diameter are alternately arranged in a hole ratio of 1: 1.
  • Polyethylene terephthalate (mp. 256 ° C), polypropylene as low melting point component (MFR 45 g / 10 min (230 ° C), mp. 165 ° C) Were extruded at a spinning temperature of 330 ° C. and 290 ° C., respectively, at a mixing ratio of 50:50.
  • 390 ° C heated air is blown at a pressure of 0.1 l OMPa, and the fine fibers are deposited on the surface of a stainless steel rotating roll with an outer diameter of 120 mm installed under the nozzle and parallel to the nozzle.
  • the mixture was collected on a suction conveyor belt to produce a mixed fiber melt-opened nonwoven fabric having a basis weight of 40 gZm 2 .
  • the resulting mixed-melt-blown nonwoven fabric had an average fiber diameter of 8.4 ⁇ m and an average orientation angle of 20 degrees.
  • the mixture was spun under the same production conditions and collected directly on a suction conveyor net to produce a mixed melt-blown nonwoven fabric having a basis weight of 40 g Zm 2 .
  • the obtained mixed fiber meltblown nonwoven fabric had an average fiber diameter of 8.2 m and an average orientation angle of 41 degrees.
  • the above blended melt-blown nonwoven fabric having an average fiber diameter of 8.4 m and an average orientation angle of 20 degrees was heated with a stainless steel drier, wound around a stainless steel pipe in a state where the low melting point component was dissolved, and had an outer diameter of about 5 mm. After reaching 8 mm, heat the above-mentioned mixed-melt-blown nonwoven fabric with an average fiber diameter of 8.2 ⁇ m and an average orientation angle of 41 ° using an air-through dryer, and wind it around the outside with the low-melting-point component dissolved.
  • Example 2 Extrusion was performed at the same extrusion temperature using the same spinneret and thermoplastic resin as in Example 4. Heated air at 390 ° C was blown at a pressure of 0.12 MPa, and the fine fibers were directly collected on a suction conveyor net to produce a mixed-melt blown nonwoven fabric having a basis weight of 40 gm 2 . The resulting mixed fiber meltblown nonwoven fabric had an average fiber diameter of 7.0 m and an average orientation angle of 40 degrees. The mixed melt-blown nonwoven fabric was wound around a stainless steel pipe in the same manner as in Example 4 to produce a cylindrical filter having an inner diameter of 30 mm, an outer diameter of 69 mm, and a length of 25 O mm. Table 1 shows the measurement results. The obtained cylindrical filter had higher water flow resistance and a shorter filtration life than Example 4.
  • the obtained composite meltblown nonwoven fabric had an average fiber diameter of 12.8 / im and an average orientation angle of 43 degrees.
  • a composite meltblown nonwoven fabric having an average fiber diameter of 12.2 / im and an average orientation angle of 25 ° was heated with an air-through drier to dissolve the low melting point component.
  • Extrusion was performed at the same extrusion temperature using the same spinneret and thermoplastic resin as in Example 5.
  • 3 8 0 heated air ° C and pressure 0. 0 8 5MP a fat port one is collected directly fence Chillon conveyor net fine ⁇ fibers to produce a composite nonwoven fabric having a mass per unit area of 4 0 gZm 2 .
  • the obtained composite meltblown nonwoven fabric had an average fiber diameter of 10.6 ⁇ m and an average orientation angle of 39 degrees.
  • the heated air in the same production method 3 8 0 ° C was blown at a pressure 0. 04 MP a, the fine ⁇ fibers directly trapped in the suction conveyor net, composite basis weight 40 g / m 2 Melt professional nonwoven fabric was manufactured.
  • the obtained composite meltblown nonwoven fabric had an average fiber diameter of 19.3 ⁇ m and an average orientation angle of 40 °.
  • the same manufacturing method as in Example 5 was used. First, the above composite melt-blown nonwoven fabric having an average fiber diameter of 10.6 m and an average orientation angle of 39 degrees was wound around a stainless steel pipe. The above composite melt-blown nonwoven fabric having a diameter of 19.3 ⁇ m and an average orientation angle of 40 ° was wound to produce a cylindrical filter having an inner diameter of 30 mm, an outer diameter of 69 mm, and a length of 250 mm. Table 1 shows the measurement results. In the obtained cylindrical filter 1, the fiber diameter of the outer layer portion was increased to increase the opening diameter of the filter medium. However, compared to Example 5, the water flow resistance was higher and the filtration life was shorter. Filter inner layer Filter outer layer Filter performance
  • Example 4 Mixed woven fabric 8. 4 20 68 Mixed fabric 8. 2 41 76 0.04 9.6 / 10. 8 85
  • the cylindrical filter of the present invention has a water flow resistance that is higher than that of a filter made of randomly dispersed fibers by orienting the melt blown fibers used in the filter in the circumferential direction of the cylindrical filter.
  • the filtration life can be improved, and the outer layer side has a higher porosity, which has the effect of further reducing water flow resistance and extending filtration life.
  • a composite fiber / mixed fiber composed of a high melting point resin and a low melting point resin, there is an effect of preventing squeezing of a filter medium and a decrease in filtration accuracy when water flow resistance increases.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention concerne un filtre cylindrique caractérisé par une faible résistance au passage de l'eau et une longévité de filtration accrue. En outre, ce filtre est entouré de couches de textile non tissé. Au moins une couche du textile non tissé est formée de textile non tissé soumis au procédé de fusion-soufflage et constitué de fibres soumises au procédé de fusion-soufflage dont l'angle d'orientation est de 30° maximum par rapport au sens circulaire du filtre cylindrique.
PCT/JP2000/000292 2000-01-21 2000-01-21 Filtre cylindrique et son procede de fabrication WO2001052969A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018021426A1 (fr) 2016-07-28 2018-02-01 Jnc株式会社 Filtre en profondeur rinçable à contre-courant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594202A (en) * 1984-01-06 1986-06-10 Pall Corporation Method of making cylindrical fibrous filter structures
EP0634511A1 (fr) * 1993-07-16 1995-01-18 Chisso Corporation Produit de fibres microfines et procédé pour sa réalisation
EP0825287A1 (fr) * 1995-02-20 1998-02-25 Toray Industries, Inc. Etoffe non-tissée et materiau de filtratation à partir de celle-ci et procédé pour la production
JPH1119435A (ja) * 1997-07-07 1999-01-26 Tounen Tapirusu Kk 極細複合繊維不織布からなる円筒状フィルター及びその製造方法
JP2000024427A (ja) * 1998-07-14 2000-01-25 Chisso Corp フィルター

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594202A (en) * 1984-01-06 1986-06-10 Pall Corporation Method of making cylindrical fibrous filter structures
EP0634511A1 (fr) * 1993-07-16 1995-01-18 Chisso Corporation Produit de fibres microfines et procédé pour sa réalisation
EP0825287A1 (fr) * 1995-02-20 1998-02-25 Toray Industries, Inc. Etoffe non-tissée et materiau de filtratation à partir de celle-ci et procédé pour la production
JPH1119435A (ja) * 1997-07-07 1999-01-26 Tounen Tapirusu Kk 極細複合繊維不織布からなる円筒状フィルター及びその製造方法
JP2000024427A (ja) * 1998-07-14 2000-01-25 Chisso Corp フィルター

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018021426A1 (fr) 2016-07-28 2018-02-01 Jnc株式会社 Filtre en profondeur rinçable à contre-courant
KR20190022645A (ko) 2016-07-28 2019-03-06 제이엔씨 주식회사 역세 가능한 뎁스 필터
CN109562312A (zh) * 2016-07-28 2019-04-02 捷恩智株式会社 可逆洗深层过滤器
JPWO2018021426A1 (ja) * 2016-07-28 2019-05-23 Jnc株式会社 逆洗可能なデプスフィルター
US11141686B2 (en) 2016-07-28 2021-10-12 Jnc Corporation Backwashable depth filter

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