CN102512881B - Composite type fiber filtering material and preparation method thereof as well as filtering bag - Google Patents
Composite type fiber filtering material and preparation method thereof as well as filtering bag Download PDFInfo
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- CN102512881B CN102512881B CN201110451959.3A CN201110451959A CN102512881B CN 102512881 B CN102512881 B CN 102512881B CN 201110451959 A CN201110451959 A CN 201110451959A CN 102512881 B CN102512881 B CN 102512881B
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Abstract
The invention provides a composite type fiber filtering material and a preparation method thereof as well as a filtering bag made by the same. The composite type fiber filtering material comprises a supporting layer, a fiber web layer and a PTFE (Polytetrafluoroethylene) covering film, wherein the supporting layer is made of polyphenylene sulfide fiber, polytetrafluoroethylene fiber, meta-aramid fiber or polyimide fiber; the fiber web layer is made of polyphenylene sulfide fiber and arranged on the supporting layer; and the PTFE covering film is arranged on the fiber web layer; and the fiber web layer is formed by polyphenylene sulfide fiber webs with an average diameter of 2-10 microns. According to the composite type fiber filtering material disclosed by the invention, the fiber web layer, which is formed by ultra-thin fiber webs on the traditional acupuncture filtering felt through a melt spinning process, is added. The fiber web layer is in a more abundant microcellular structure with a smaller aperture, so that smoke and tiny dust are effectively separated outside an ash collecting layer, the tiny dust is prevented from entering into the filtering material, and the filtering efficiency is improved.
Description
Technical field
The filter bag that the present invention relates to a kind of composite fibre filtering material, its preparation method and made by it.
Background technology
Polyphenylene sulfide fibre filtrate is the first-selected filtering material of current coal-burning power plant flue gas bag-type dusting.Current filtering material is all to be made and met red dog by needling process taking polyphony thioether short fiber as raw material, meet on red dog, adhere to again PTFE perforated membrane or coated with PTFE emulsion after film forming, form polyphenylene sulfide fibre filtering material.
For improving the filter efficiency of filtrate and extending its service life, deliver the multinomial patent of invention relevant with technology of preparing and product form both at home and abroad.
Application for a patent for invention CN101406779A discloses a kind of polyphenylene sulfide Nomex filtering material of MULTILAYER COMPOSITE, mainly be to meet grey surface layer and used (1dtex) polyphenylene sulfide fibre of thin dawn, its average diameter is 3-12 μ m, makes filtering material have the efficiency higher than ordinary filter.But the filtering material preparation method that this invention provides is very loaded down with trivial details.First to weave cotton cloth as base cloth, at the stacked fleece of a side of base cloth, form filter course, then at the opposite side stacked fleece again of base cloth, form non-filter course, through repeatedly just making this filtering material after stacked setting, this process complexity, and be not suitable for large-scale industrial production, just do not find at present the application of similar production method.
Application for a patent for invention CN101581009A discloses the one-time formed Apparatus and method for of multiple melt-blown filter materials, by the meltblown layer with compound other material of one deck of melt-blown mode again on established melt-blown material, reach stabilized product quality, the object reducing production costs.But in this application for a patent for invention and the parameter such as throughput, arresting efficiency of unexposed this filtering material, cannot confirm whether every strainability of this product is applicable to prepare filter bag.
Summary of the invention
Low in order to solve the mistake efficiency that existing filtering material exists, the defect that service life is short, the invention provides a kind of compound polyphenylene sulfide fibre filtering material.
A kind of composite fibre filtering material provided by the invention, comprises supporting layer, is made up of polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber; The web layer of being made up of polyphenylene sulfide fibre, is arranged on supporting layer; And PTFE film, be arranged in unordered web layer, wherein, the polyphenylene sulfide fibre silk screen that web layer is 2～10 μ m by average diameter forms.
Further, this supporting layer forms web layer and lower web layer by the first short fiber, and is arranged on the second short fiber yarn casing play composition between web layer and lower web layer; The first short fiber and the second short fiber are selected from respectively the one in polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber.
Further, this first short fiber and the second short fiber are identical or different.
Further, the filament number of this first short fiber and the second short fiber is 1.0dtex～5.0dtex.
Further, this composite fibre filtering material, the weight per unit area of filtering material is 450g/m
2～550g/m
2, wherein, the weight per unit area of web layer is 50～120g/m
2, the weight per unit area of supporting layer is 400～500g/m
2.
Another object of the present invention is to provide the preparation method of composite fibre filtering material, it is characterized in that, comprise the following steps: prepare supporting layer: form supporting layer by polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber through acupuncture, thermal finalization step; Preparation web layer: polyphenylene sulfide melt Conveying, in meltblown beam, is sprayed under the hot air acting of 300～380 DEG C, and be drawn as melt-flow, melt-flow sticks on supporting layer, forms web layer; Preparation PTFE film: be combined with each other and form composite felt through acupuncture or water thorn operation by web layer and supporting layer, and the PTFE film with microcellular structure is sticked in web layer by heat bonding, through hot-rolling pressur rolling forming, formation composite fibre filtering material.
Further, the spinneret orifice diameter of this meltblown beam is 0.20～0.30mm, and draw ratio is 7/1～10/1, and micropore center distance is 0.8mm～1.2mm, the single hole flow of melt is 0.3～0.6ml/min, and in melt spray fibre web, the mean value of single fiber diameter is 2～10 μ m.
Further, this composite felt processing method is water thorn or one side acupuncture.
Further, the acupuncture of this composite felt is facing to web layer, and the degree of depth of acupuncture is 2mm～10mm, and needling density is 20～100 pins/cm
2.
A further object of the present invention is to provide a kind of filter bag, and this filter bag is made up of above-mentioned composite fibre filtering material.
Composite filter material involved in the present invention, on traditional needled filtering felt, increase by melt-blown process the web layer being formed by superfine fibre fibre web, this web layer has more horn of plenty, the more tiny microcellular structure in aperture, thereby effectively flue gas micronic dust is intercepted meeting outside grieshoch, avoid micronic dust to go deep into filtering material inside, improve filter efficiency.Preparation method provided by the invention is simple and convenient, is applicable to commercial Application.The filter bag of being made up of this composite filter material has useful life longevity, and good filter effect.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows according to the process flow diagram of the composite filter material preparation method of the embodiment of the present invention;
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but following embodiment and accompanying drawing are only to understand the present invention, and can not limit the present invention, the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Compound polyphenylene sulfide fibre filtering material provided by the invention, comprises the supporting layer of being made up of polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber; The web layer being formed by polyphenylene sulfide fibre, this web layer is arranged on supporting layer; And be arranged on the PTFE film in unordered web layer.Wherein, the polyphenylene sulfide fibre silk screen that this web layer is 2～10 μ m by average diameter forms.Because the web layer of this filtering material is made up of melt-blown non-woven material, average diameter after melt-blown is only 2～10 μ m, thereby the ultra-fine web layer forming has more horn of plenty, the more tiny microcellular structure in aperture, there is the efficiency of dust collection higher than common filtering material, and supporting layer has ensured the overall mechanical properties of material, further meet the requirement of filtering material.
As everyone knows, filtering material will be through the impact of several ten thousand subpulse air, and therefore the material require of supporting layer has certain intensity, needs to have fatigue durability simultaneously, can make filtering material have useful life longevity.Therefore the material that can be used for supporting layer includes but not limited to the materials such as polyphenylene sulfide, polytetrafluoroethylene (PTFE) (PTFE), meta-aramid (aramid fiber 1313), polyimide fiber (P84).Those skilled in the art can select suitable material to make supporting layer according to the actual requirements.In detailed description of the invention provided by the invention, this supporting layer forms web layer and lower web layer by the first short fiber, and be arranged on the second short fiber yarn casing play composition between web layer and lower web layer, the first short fiber and described the second short fiber are selected from respectively the one in polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber, and the first short fiber and described the second short fiber identical or different.
More preferably, the filament number of this polyphony thioether short fiber is 1.0dtex～5.0dtex.The weight per unit area of this filtering material is 450g/m
2～550g/m
2, wherein, the weight per unit area of web layer is 50～120g/m
2, the weight per unit area of supporting layer is 400～500g/m
2.So both can keep certain throughput and certain intensity, can ensure again certain capture rate.
The preparation method who prepares above-mentioned compound polyphenylene sulfide fibre filtering material comprises the following steps: polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber are made to supporting layer through acupuncture, thermal finalization step; Polyphenylene sulfide melt Conveying, in meltblown beam, is sprayed under the hot air acting of 300～380 DEG C, and be drawn as melt-flow, melt-flow adheres on supporting layer and forms web layer; Be combined with each other and form composite felt through acupuncture or water thorn operation by web layer and supporting layer, the PTFE film with microcellular structure is sticked in web layer by heat bonding, through hot-rolling pressur rolling forming, form compound polyphenylene sulfide filtering material.
In the process of preparing supporting layer, the needling density of acupuncture step and the degree of depth are less than needling density and the degree of depth of acupuncture step in preparation composite felt process, so that melt-flow compound in fibrage preparation process.
Adopt this preparation method, by by melt-blown polyphenylene sulfide fibre on supporting layer, combine with supporting layer, utilize the superfine fibre web layer of melt-blown formation that the subparticle in dust is intercepted to the surface at filter material, prevent that subparticle is penetrated into the inside of filter material, improve the operating efficiency of novel filter material and filter bag, service time extended period.
In the process of formation web layer, the spinneret orifice diameter of meltblown beam is 0.20～0.30mm, and draw ratio is 7/1～10/1, and micropore center distance is 0.8mm～1.2mm, the single hole flow of melt is 0.3～0.6ml/min, and in melt spray fibre web, the mean value of single fiber diameter is 3.5 μ m.
Be water thorn or one side acupuncture to the processing method of composite felt, and in composite felt, acupuncture is facing to web layer, the degree of depth of acupuncture is 5～15mm, is preferably 2mm～10mm, and needling density is 100～300 times/cm
2, be preferably 20～100 pins/cm
2.For traditional handicraft, in this scheme of the present invention, the step of water thorn or acupuncture be by polyphenylene sulfide melt spray on supporting layer, form and carry out after web layer.For traditional handicraft, in the present invention, increase the step of preparation web layer, can play and prevent that subparticle is penetrated into the inside of filter material, improve the operating efficiency of novel filter material and filter bag, the effect of service time extended period, meanwhile, because increased the step of preparation web layer, can reduce needling density and depth of needling in the step of water thorn or acupuncture, reduce work difficulty and reduce consumption in operation.
Meanwhile, in the typical embodiment of one of the present invention, also provide a kind of filter bag, this filter bag is made up of above-mentioned composite fibre filtering material.The filter bag of being made up of above-mentioned compound polyphenylene sulfide fibre filtering material, has good mechanical property, and useful life longevity is strong, and the advantage of good filtration effect can be widely applied in coal filtration or coal-burning power plant's flue.
Method of testing
1. mechanical strength test: GB/T 17638-1998
2. air permeability test: GB/T 5453-1997 (mensuration of textile, fabric breathability)
3. efficiency of dust collection: aging rear 30 constant-pressure test: HJ/T324-2006 (People's Republic of China's environmental industry standard sack cleaner filtrate standard)
4. dust is peeled off rate test: HJ/T324-2006 (People's Republic of China's environmental industry standard----sack cleaner filtrate standard)
Comparative example (common polyphenylene sulfide acupuncture filter material)
Make and meet red dog by needling process taking polyphony thioether short fiber as raw material: polyphony thioether short fiber (length 51mm, fiber number 2.2dtex) through shredding, carding and laying net-forming process, with after polyphenylene sulfide yarn base cloth lamination, enter pre-needling, second He tri-road acupunctures, become polyphenylene sulfide Nomex element felt through tentering thermal finalization again, heat setting temperature is 230 DEG C.
Meet on red dog, adhere to again PTFE perforated membrane or coated with PTFE emulsion after film forming, form polyphenylene sulfide fibre filtering material.
The mechanical strength of gained filtering material is warp-wise: 600N after tested, broadwise: 800N.
The air permeability of this composite filtering material is 100L/m
2s, efficiency of dust collection is 95.5% (aging rear 30 constant-pressure tests), it is 90.7% that dust is peeled off rate.
Embodiment 1
Polyphony thioether short fiber (length 5mm, fiber number 2.2dtex) through shredding, carding and laying net-forming process, with after polyphenylene sulfide yarn base cloth lamination, enter pre-needling, second He tri-road acupunctures, become polyphenylene sulfide Nomex element felt (supporting layer) through tentering thermal finalization again, heat setting temperature is 230 DEG C.Then Nomex element felt will be pulled and enter melt-blown operation.
Fig. 1 shows the process flow diagram of the composite filter material that the present embodiment provides.Preparing this compound device comprises with lower component: meltblown beam 1, melt metering pump, screw extruder, pressure-air heater, Nomex driving wheel and hot rolling forming rolls.
Polyphenylene sulfide is formed to viscous state melt in single screw extrusion machine, and screw rod maximum temperature is 340 DEG C, and (340 DEG C time, this melt is 1.5 × 10～2.5 × 10
3sec
-1range of shear rate in shear viscosity be 3.0 × 10
2～2.4 × 10Pas).This melt is pumped into meltblown beam 1 by melt-stoichiometry.The spinneret orifice diameter of this meltblown beam 1 is 0.28mm, and draw ratio is 8/1, and micropore center distance is 1.mm, and the single hole flow of melt is 0.53ml/min, and in melt spray fibre web, the mean value of single fiber diameter is 3.5 μ m.Pressure-air heater joins high temperature air in the air duct of spinneret orifice both sides, melt forms melt thread 2 and sprays under the effect of high temperature air (300380 DEG C), melt thread 2 had dropped on polyphenylene sulfide Nomex 3 before solidifying, through supersolidification and inter-adhesive after form ultra-fine web layer, because web layer forms through melt blown process, so the filament diameter of polyphenylene sulfide is only 2 μ m, the fibre web strainability forming is like this very good.
The Nomex that is formed with web layer is advanced by traction, and the speed of advancing can be adjusted according to melt-blown melt amount, and in the present embodiment, the gait of march of Nomex is 5m/min.The composite felt weight of web layer and acupuncture layer adds and is combined into 500g/m
2.Subsequently, composite felt continues to be subject to traction to enter acupuncture operation, carries out acupuncture under the effect of needling device 4.In the present embodiment, acupuncture operation is one side acupuncture, and acupuncture is facing to meltblown layer.Depth of needling is 2mm, and needling density is 100 times/cm
2.
Be to carry out heat pressure adhesive sizing under the pressure rolling effect of sizing hot-rolling 6 of 250 DEG C in surface temperature, at the meltblown layer surface adhesion PTFE of above-mentioned composite felt film 5, finally become compound polyphenylene sulfide fibre filtrate 7.
The weight per unit area of this composite filtering material is: 500g/m
2; The weight per unit area of web layer is: 80g/m
2; The weight per unit area of supporting layer is: 400g/m
2.
The mechanical strength of this composite filtering material is warp-wise: 800N after tested, broadwise: 1000N (method of testing is with reference to GB/T176381998).
The air permeability of this composite filtering material is 180L/m
2s, efficiency of dust collection is 99.999% (aging rear 30 constant-pressure tests), it is 99.7% that dust is peeled off rate.Efficiency of dust collection and dust are peeled off rate and are all better than common polyphenylene sulfide needle punched filter material.
Embodiment 2
Polytetrafluoroethylene fibre (length 51mm, fiber number 3.0dtex) through shredding, carding and laying net-forming process, with after polytetrafluoroethylene (PTFE) yarn base cloth lamination, enter pre-needling, second acupuncture, become polytetrafluoroethylpunched punched felt element felt through tentering thermal finalization again, heat setting temperature is 250 DEG C.Then Nomex element felt will be pulled and enter melt-blown operation.
Fig. 1 shows the process flow diagram of the composite filter material that the present embodiment provides.Preparing this compound device comprises with lower component: meltblown beam 1, melt metering pump, screw extruder, pressure-air heater, Nomex driving wheel 5 and hot rolling forming rolls 6.
Polyphenylene sulfide is formed to viscous state melt in single screw extrusion machine, and screw rod maximum temperature is 340 DEG C, and (340 DEG C time, this melt is 1.5 × 10～2.5 × 10
3sec
-1range of shear rate in shear viscosity be 3.0 × 10
2～2.4 × 10Pas).This melt is pumped into meltblown beam 1 by melt-stoichiometry.The spinneret orifice diameter of this meltblown beam 1 is 0.20mm, and draw ratio is 7/1, and micropore center distance is 0.8mm, and the single hole flow of melt is 0.3ml/min, and in melt spray fibre web, the mean value of single fiber diameter is 2 μ m.Pressure-air heater joins high temperature air in the air duct of spinneret orifice both sides, melt forms melt thread 2 and sprays under the effect of high temperature air (300-380 DEG C), melt thread 2 had dropped on polytetrafluoroethylpunched punched felt 3 before solidifying, form ultra-fine web layer through supersolidification with after being cross-linked with each other, because web layer forms through melt blown process, so the filament diameter of polyphenylene sulfide is only 1 μ m, the fibre web strainability forming is like this very good.
The Nomex that is formed with web layer is advanced by traction, and the speed of advancing can be adjusted according to melt-blown melt amount, and in the present embodiment, the gait of march of Nomex is 5m/min.The composite felt weight of web layer and acupuncture layer adds and is combined into 500g/m
2.Subsequently, composite felt continues to be subject to traction to enter acupuncture operation, carries out acupuncture under the effect of needling device 4.In the present embodiment, acupuncture operation is one side acupuncture, and acupuncture is facing to meltblown layer.Depth of needling is 5mm, and needling density is 40 times/cm
2.
Be to carry out heat pressure adhesive sizing under the pressure rolling effect of sizing hot-rolling 6 of 250 DEG C in surface temperature, at the meltblown layer surface adhesion PTFE of above-mentioned composite felt film 5, finally become compound polyphenylene sulfide fibre filtrate 7.
The weight per unit area of this composite filtering material is: 455g/m
2; The weight per unit area of web layer is: 50g/m
2; The weight per unit area of supporting layer is: 400g/m
2.
The mechanical strength of this composite filtering material is warp-wise: 850N after tested, broadwise: 950N (method of testing is with reference to GB/T 176381998).
The air permeability of this composite filtering material is 175L/m
2s, efficiency of dust collection is 99.9959% (aging rear 30 constant-pressure tests), it is 99.6% that dust is peeled off rate.Efficiency of dust collection and dust are peeled off rate and are all better than common polyphenylene sulfide needle punched filter material.
Embodiment 3
Meta-aramid short fiber (length 51mm, fiber number 3.3dtex) through shredding, carding and laying net-forming process, with after polytef flocks yarn base cloth lamination, enter pre-needling, second He tri-road acupunctures, become polytetrafluoroethylpunched punched felt element felt through tentering thermal finalization again, heat setting temperature is 230 DEG C.Then Nomex element felt will be pulled and enter melt-blown operation.
Fig. 1 shows the process flow diagram of the composite filter material that the present embodiment provides.Preparing this compound device comprises with lower component: meltblown beam 1, melt metering pump, screw extruder, pressure-air heater, Nomex driving wheel and hot rolling forming rolls.
Polyphenylene sulfide is formed to viscous state melt in single screw extrusion machine, and screw rod maximum temperature is 340 DEG C, and (340 DEG C time, this melt is 1.5 × 10～2.5 × 10
3sec
-1range of shear rate in shear viscosity be 3.0 × 10
2～2.4 × 10Pas).This melt is pumped into meltblown beam 1 by melt-stoichiometry.The spinneret orifice diameter of this meltblown beam 1 is 0.30mm, and draw ratio is 10/1, and micropore center distance is 1.2mm, and the single hole flow of melt is 0.6ml/min, and in melt spray fibre web, the mean value of single fiber diameter is 10 μ m.Pressure-air heater joins high temperature air in the air duct of spinneret orifice both sides, melt forms melt thread 2 and sprays under the effect of high temperature air (300-380 DEG C), melt thread 2 had dropped on polyphenylene sulfide Nomex 3 before solidifying, and formed ultra-fine web layer through supersolidification with after being cross-linked with each other.
The Nomex that is formed with web layer is advanced by traction, and the speed of advancing can be adjusted according to melt-blown melt amount, and in the present embodiment, the gait of march of Nomex is 5m/min.The composite felt weight of web layer and acupuncture layer adds and is combined into 500g/m
2.Subsequently, composite felt continues to be subject to traction to enter acupuncture operation, carries out acupuncture under the effect of needling device 4.In the present embodiment, acupuncture operation is one side acupuncture, and acupuncture is facing to meltblown layer.Depth of needling is 10mm, and needling density is 80 times/cm
2.
Be to carry out heat pressure adhesive sizing under the pressure rolling effect of sizing hot-rolling 6 of 250 DEG C in surface temperature, at the meltblown layer surface adhesion PTFE of above-mentioned composite felt film 5, finally become compound polyphenylene sulfide fibre filtrate 7.
The weight per unit area of this composite filtering material is: 550g/m
2; The weight per unit area of web layer is: 120g/m
2; The weight per unit area of supporting layer is: 500g/m
2.
The mechanical strength of this composite filtering material is warp-wise: 850N after tested, broadwise: 950N (method of testing is with reference to GB/T 176381998).
The air permeability of this composite filtering material is 175L/m
2s, efficiency of dust collection is 99.999% (aging rear 30 constant-pressure tests), it is 99.8% that dust is peeled off rate.Efficiency of dust collection and dust are peeled off rate and are all better than common polyphenylene sulfide needle punched filter material.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a composite fibre filtering material, is characterized in that, comprises
Supporting layer, is made up through acupuncture, thermal finalization step of polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber;
The web layer of being made up of polyphenylene sulfide fibre, is arranged on described supporting layer; And
PTFE film, is arranged in described web layer, wherein,
The polyphenylene sulfide fibre silk screen that described web layer is 2～10 μ m by average diameter forms, described web layer is passed through polyphenylene sulfide melt Conveying in meltblown beam, under the hot air acting of 300～380 DEG C, spray, and be drawn as melt-flow, described melt-flow sticks to and on described supporting layer, forms described web layer, and described in it, web layer and supporting layer are through the acupuncture operation formation composite felt that is combined with each other;
Wherein, described in the process of preparing supporting layer the needling density of acupuncture step and the degree of depth be less than needling density and the degree of depth of acupuncture step in preparation composite felt process.
2. composite fibre filtering material according to claim 1, it is characterized in that, described supporting layer forms web layer and lower web layer by the first short fiber, and is arranged on the second short fiber yarn casing play composition between described upper web layer and lower web layer; Described the first short fiber and described the second short fiber are selected from respectively the one in polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber.
3. composite fibre filtering material according to claim 2, is characterized in that, described the first short fiber and described the second short fiber are identical or different.
4. composite fibre filtering material according to claim 2, is characterized in that, the filament number of described the first short fiber and described the second short fiber is 1.0dtex～5.0dtex.
5. according to the composite fibre filtering material described in any one in claim 1-4, it is characterized in that, the weight per unit area of described filtering material is 450g/m
2～550g/m
2, wherein, the weight per unit area of described web layer is 50～120g/m
2, the weight per unit area of described supporting layer is 400～500g/m
2.
6. a preparation method for composite fibre filtering material, is characterized in that, comprises the following steps:
Prepare supporting layer: form described supporting layer by polyphenylene sulfide fibre, polytetrafluoroethylene fibre, meta-aramid fibers or polyimide fiber through acupuncture, thermal finalization step;
Preparation web layer: polyphenylene sulfide melt Conveying, in meltblown beam, is sprayed under the hot air acting of 300～380 DEG C, and be drawn as melt-flow, described melt-flow sticks on described supporting layer, forms described web layer;
Preparation PTFE film: described web layer and supporting layer are passed through to the acupuncture operation formation composite felt that is combined with each other, and the PTFE film with microcellular structure is sticked in described web layer by heat bonding, through hot-rolling pressur rolling forming, form described composite fibre filtering material;
Wherein, described in the process of preparing supporting layer the needling density of acupuncture step and the degree of depth be less than needling density and the degree of depth of acupuncture step in preparation composite felt process.
7. preparation method according to claim 6, it is characterized in that, the spinneret orifice diameter of described meltblown beam is 0.20～0.30mm, draw ratio is 7/1～10/1, micropore center distance is 0.8mm～1.2mm, the single hole flow of melt is 0.3～0.6ml/min, and in melt spray fibre web, the mean value of single fiber diameter is 2～10 μ m.
8. preparation method according to claim 6, is characterized in that, described composite felt processing method is water thorn or one side acupuncture.
9. preparation method according to claim 8, is characterized in that, the acupuncture of described composite felt is facing to described web layer, and the degree of depth of acupuncture is 2mm～10mm, and needling density is 20～100 pins/cm
2.
10. a filter bag, is characterized in that, described filter bag is made up of the composite fibre filtering material described in any one in claim 1-5.
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| CN105582745A (en) * | 2014-10-24 | 2016-05-18 | 张家港骏马无纺布有限公司 | Superfine-fiber filtering material and preparation method therefor |
| JP2020524595A (en) * | 2017-06-22 | 2020-08-20 | 東レ株式会社 | Filtration material |
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