CN104711746A - Filter screen applied to phosphoric acid industry and weaving method thereof - Google Patents
Filter screen applied to phosphoric acid industry and weaving method thereof Download PDFInfo
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- CN104711746A CN104711746A CN201410429823.6A CN201410429823A CN104711746A CN 104711746 A CN104711746 A CN 104711746A CN 201410429823 A CN201410429823 A CN 201410429823A CN 104711746 A CN104711746 A CN 104711746A
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/36—Cored or coated yarns or threads
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
- D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/04—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
- D10B2321/042—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/06—Load-responsive characteristics
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/06—Load-responsive characteristics
- D10B2401/062—Load-responsive characteristics stiff, shape retention
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Filtering Materials (AREA)
- Woven Fabrics (AREA)
Abstract
The invention discloses a filter screen applied to the phosphoric acid industry. The filter screen is formed by composite monofilaments in a weaving mode. Each composite monofilament is of a skin-core structure, each core layer is made of a PET dacron resin material, and each skin layer is formed by a mixed material of PP and PTFE in a high-temperature critical point shaping mode, wherein the critical point temperature is 120-180 DEG C. The texture of the filter screen is any one of a plain weave, a twill weave, a satin weave and a multilayer fabric structure. The filter net has the characteristics of perpetual crystallization resistance, perpetual hydrolytic resistance, and perpetual antifouling, oil repellency and water repellency. At a high temperature, the size is stable, the abrasion resistance is high, and the drainage performance is excellent. Compared with an existing filter screen, the treatment efficiency of the filter screen is improved by over 20%, and the abrasion-proof service life is doubled. Meanwhile, the invention discloses a weaving method of the filter screen.
Description
Technical field
The present invention relates to a kind of composite monofilament filter screen, refer more particularly to a kind of filter screen and the weaving method thereof that are applied to phosphoric acid industry.
Background technology
Phosphoric acid is the basic material of various technical grade and food-grade phosphate, is one of important goods and materials of national economy.In recent years, along with energy shortage be on the rise, the quick rise of price, the continuous change of the market demand, traditional w(H3PO4) 75% and 85% industrial phosphoric acid be difficult to adaptation to market variations demand, integrate with for making production and need, product must be made constantly to upgrade, the new product of exploitation high added value.The emergence of phosphorous chemical industry, whether the production being mainly reflected in basic product and intermediate products takes its place in the front ranks of the world.Although China is the big country of a phosphorus ore rich reserves, on the serial fine phosphorus chemical product of multi-functional, many specifications, also there is a certain distance with prostatitis, the world.Rock phosphate in powder is a kind of non-renewable resources, how to improve the capability and performance of product, most important for China's development phosphorus chemical industry.In conjunction with the feature of China's phosphate rock resource, along with developing rapidly of China's electron trade, high-purity phosphoric acid is used widely in electron trade.Because high-purity phosphoric acid belongs to the fine phosphorus chemical product of high-tech, high added value, so develop the extensive attention that new high-purity phosphoric acid production technology is subject to everybody always.
In recent years, along with agricultural is to the demand containing phosphatic manure, phosphoric acid by wet process has had larger development.Phosphoric acid is the important source material of producing high-concentration phosphate compound fertilizers, and phosphorus ammonium, coarse whiting etc. depend on the development of phosphoric acid industry.The production method of phosphoric acid is divided into Re Fa and wet method, thermal phosphoric acid because its energy consumption is high, price and be mainly used in phosphatic production, and phosphoric acid by wet process is at present mainly for the production of high-concentration compound fertilizer material, along with the development of wet phosphoric acid purifying technology, the phosphoric acid by wet process after purification also can be used for producing phosphate.
Due to the manufacturing technique requirent of phosphoric acid by wet process, the filter screen used at sulphur dioxide of phosphor chemical industry at present mainly also exists the problems such as crystallization, fouling, high temperature acidolysis, service life short, filter screen bulk yielding shape, the principal element of these problems is caused to have: the 1) production technology of phosphoric acid by wet process, the reaction condition (temperature more than 95 DEG C adopts concentration to be the sulfuric acid of 93-98%) of high temperature peracid; 2) taste of rock phosphate in powder, samples more low being more unfavorable for and produces; 3) content of iron and aluminium in phosphorus ore, content is higher, easier crystallization, and the filter cloth that results in blockage makes filtration more difficult; 4) Acidity of Aikalinity of wash water, the lower crystallization of pickling is faster, and the reproducibility of the stronger filter cloth of pickling is better; 5) reaction temperature, reaction temperature height then slurry temperature is high, during contact filter cloth, chain cloth performance is changed.Along with filter screen crystallization, harden, degrade, the appearance of the problem such as change in size, the strainability of filter screen declines gradually, makes production capacity and the quality degradation of product, simultaneously serious increase energy consumption.The reliable service life of current state Inner filter net is no more than 30 days.The filter screen used in phosphorous chemical industry high-end product is main dependence on import filter screen at present, but can not reach the requirement of industry production completely.
Summary of the invention
For the defect that existing filter screen exists, the object of the present invention is to provide a kind of filter screen and the weaving method thereof that are applied to phosphoric acid industry, make full use of composite monofilament material advantage separately, be made into and a kind of there is permanent resistive connection crystalline substance, permanent resistant to hydrolysis, permanently antifoulingly refuse the composite monofilament filter screen that oil refuses dimensionally stable and excellent drainage under water, high temperature.
For achieving the above object, the new technical scheme that the present invention adopts is:
A kind of filter screen being applied to phosphoric acid industry, adopt composite monofilament to weave to form, it is characterized in that, described composite monofilament is skin-core structure, sandwich layer is PET polyester resin material, cortex is that the composite material of PP polypropylene and PTFE polytetrafluoroethylene (PTFE) forms through high temperature critical point sizing, and described critical point temperature is 120 DEG C ~ 180 DEG C, the texture of described filter cloth be in plain weave, twill, satin weave, multiply cloth structure any one.
Wherein, described filter screen multiply cloth texture is the combination of top layer 3/1 twill and nexine 2/2 twill, or the combination of line and nexine 2/2 twill is forged on top layer 4/1, or the combination of line and nexine 3/1 twill is forged on top layer 4/1, or the combination of top layer 1/1 plain weave and nexine 3/1 twill.
Wherein, described filter screen is filling-backed weave, formed with a system warp yarns by the weft yarn (namely showing latitude and back weft) of identical or not identical two systems, comprise the hydrophobic layer of dam layer and the bottom on surface, the described layer that dams is twill, hydrophobic layer is twill, and the layer that dams interweaves with hydrophobic layer and is connected.
Wherein, the yarn proportioning of described filter cloth is 1:1.
Wherein, the wire diameter of described composite monofilament is 0.30 ~ 1.5mm.
The present invention discloses a kind of method of weaving above-mentioned filter screen simultaneously, it is characterized in that, mainly comprises the following steps:
(1) longitude and latitude wire diameter, thread count is selected according to phosphoric acid application operating mode, application purpose;
(2) be wound in warp beam by single for composite monofilament even tension, single tension force 50-200 cN, ensure that single tension force is basically identical, single tension error is no more than 1cN simultaneously;
(3) according to technological requirement looming weaving, weaving tension is not less than 500 cN.
(4) carry out the process of high temperature critical point HEAT SETTING to filter screen, described temperature range is 120 DEG C ~ 180 DEG C.
In step (2), composite monofilament is skin-core structure, and sandwich layer is PET polyester resin material, and cortex is the composite material of PP polypropylene and PTFE polytetrafluoroethylene (PTFE).
Wherein, the texture of described filter screen be in plain weave, twill, satin weave, multiply cloth structure any one.
Wherein, described filter screen multiply cloth texture is the combination of top layer 3/1 twill and nexine 2/2 twill, or the combination of line and nexine 2/2 twill is forged on top layer 4/1, or the combination of line and nexine 3/1 twill is forged on top layer 4/1, or the combination of top layer 1/1 plain weave and nexine 3/1 twill.
Wherein, described filter screen is filling-backed weave, formed with a system warp yarns by the weft yarn (namely showing latitude and back weft) of identical or not identical two systems, comprise the hydrophobic layer of dam layer and the bottom on surface, the described layer that dams is twill, hydrophobic layer is twill, and the layer that dams interweaves with hydrophobic layer and is connected.
Wherein, the yarn proportioning of filter screen is 1:1 in step (1).
Wherein, in step (2), the wire diameter of described composite monofilament is 0.30 ~ 1.5mm.
Compared with prior art, the present invention has following technique effect:
Filter screen has permanent resistive connection crystalline substance, permanent resistant to hydrolysis, permanently antifoulingly refuses the feature that water refused by oil, at high temperature dimensionally stable, high wear resistance have excellent drainage.Compared with existing filter screen, the treatment effeciency of filter screen of the present invention improves more than 20%, and wear-resistant service life improves more than 2 times.
Detailed description of the invention
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, be explained in detail below in conjunction with embodiment.
A kind of filter screen being applied to phosphoric acid industry, adopt composite monofilament to weave to form, wherein composite monofilament is skin-core structure, sandwich layer adopts PET polyester resin material, cortex is that the composite material of PP and PTFE forms through high temperature critical point sizing, here critical point temperature scope is 120 DEG C ~ 180 DEG C, the texture of described filter screen be in plain weave, twill, satin weave, multiply cloth structure any one.
In such scheme, sizing refer to by the process of certain physics or chemistry eliminate accumulate in filter screen stress, strain, the form making it obtain certain in state, size or structure to need, and reach certain stability.HEAT SETTING refers to that filter screen is heat-treated under some tension, makes its size, the processing technology of form stable.Its meaning is 1. size setting: dimensional stability improves, and washing shrinkage declines; 2. flat set: eliminate fine wrinkle, improves wrinkle resistance; 3. improve the internal performance of filter screen: the degree of crystallinity of monofilament, intensity, filter screen breathed freely, the improvement of thickness, application performance etc.The sizing of this filter screen is HEAT SETTING, employing be the high temperature critical point technique of skin-material, temperature range 120 DEG C-180 DEG C.
The object of sizing arranges filter screen wire side, in weaving process, filter screen also exists internal stress, and this is that the stress caused because of equipment, material etc. when weaving is inconsistent because the tension force of warping local is irregular, these can make the grey cloth wire side out-of-flatness after lower machine, need arrange by sizing.Also having is exactly the performance needing to reach by sizing material, and PTFE, on most top layer, is then PP layer, sandwich layer PET.
In this embodiment, three kinds of materials advantage separately can be given full play to after high temperature critical point sizing: the DIMENSIONAL STABILITY of PET, the resistance to acids and bases of PP, the antifouling of PTFE refuses oily WATER REPELLENCY.This is because the proportion difference of three kinds of materials (proportion of PET is about 1.38, the proportion of PP is about 0.91, the proportion of PTFE is about 2.2), monofilament is composite: sandwich layer is PET, and top layer is the mixing of PP and PTFE, and the fusing point of sandwich layer PET is 250 DEG C, the fusing point of PTFE is also be greater than 250 DEG C, PP fusing point 160-170 DEG C, during HEAT SETTING and the mainly skin-material of temperature exposure, so described critical point temperature is relative PP material.Within the scope of this critical point temperature, PP material is in softening, close to molten condition, the interior molecules chain of skin-material moves, now the difference of top layer bi-material proportion can significantly show, heavy PTFE material is down moved (namely toward apparent motion), so PTFE is in the surface of monofilament after sizing, can give full play to the respective advantage of layers of material.
In the above-described embodiments, the grain design of filter screen is applicable to all fabric constructions, comprise woven and multiply cloth, wherein, woven comprises plain weave, twill or satin weave, and these three kinds of textures are basic textures of three foundation weave, belong to woven structure, plain weave is the finest and close, but its hole easily blocks, and filter cake is also slightly difficult to be peeled off; The intensity of twill-weave is the highest, and micropore not easily blocks, and flow is large; Satin weave is concentrated because of its vertical silk and is prepared, and filter cake fissility is good, but particle capturing ability is poor.Multiply cloth structure is the combination of three foundation weave, belong to two-layer and two-layer above fabric, can select according to the actual conditions of application, to reach different precision of damming, here multilayer texture comprises the combination of top layer 3/1 twill and nexine 2/2 twill, or the combination of line and nexine 2/2 twill is forged on top layer 4/1, or the combination of line and nexine 3/1 twill is forged on top layer 4/1, or the combination of top layer 1/1 plain weave and nexine 3/1 twill etc.
As one preferred embodiment, filter screen is filling-backed weave, formed with a system warp yarns by the weft yarn (namely showing latitude and back weft) of identical or not identical two systems, comprise the hydrophobic layer of dam layer and the bottom on surface, the described layer that dams is twill, hydrophobic layer is twill, described in dam layer and hydrophobic layer interweave and be connected.
Wherein, the yarn proportioning of described filter screen has different proportionings in different industries, and be 1:1 in phosphoric acid industry, yarn proportioning can design as the case may be.
As a kind of preferred embodiment, the wire diameter of composite monofilament is 0.30 ~ 1.5mm,
Weave the method for above-mentioned filter cloth, mainly comprise the following steps:
(1) longitude and latitude wire diameter, thread count is selected according to application operating mode, application purpose;
(2) be wound in warp beam by single for composite monofilament even tension, single tension force 50-200 cN, ensure that single tension force is basically identical, single tension error is no more than 1cN simultaneously;
(3) according to technological requirement looming weaving, weaving tension is not less than 500 cN.
(4) HEAT SETTING process: stable dimensions, reaches the application performance of filter screen simultaneously.
In the step (1) of above-described embodiment, retain precision and air permeability in order to what reach design, different wire diameters and density can be selected, 0.65 mm can be selected, density 250/10cm, or 0.45 mm, density 350/10cm etc.
In the step (2) of above-described embodiment, composite monofilament is skin-core structure, and sandwich layer is PET polyester resin material, and cortex is the composite material of PP polypropylene and PTFE polytetrafluoroethylene (PTFE).The texture of filter cloth be in plain weave, twill, satin weave, multiply cloth structure any one.
To dam required precision according to the difference of different industries, different grain design can be selected, here several relatively more conventional filter cloth texture is enumerated, comprise the combination of top layer 3/1 twill and nexine 2/2 twill, or the combination of line and nexine 2/2 twill is forged on top layer 4/1, or the combination of line and nexine 3/1 twill is forged on top layer 4/1, or the combination of top layer 1/1 plain weave and nexine 3/1 twill, here only enumerate, actual texture is not limited to this, can select flexibly according to applicable cases.
As one preferably embodiment, filter screen is filling-backed weave, formed with a system warp yarns by the weft yarn (namely showing latitude and back weft) of identical or not identical two systems, comprise the hydrophobic layer of dam layer and the bottom on surface, the layer that wherein dams is twill, hydrophobic layer is twill, and the layer that dams interweaves with hydrophobic layer and is connected.
Wherein, the yarn proportioning of filter screen is 1:1 in step (1).
Wherein, in step (2), the wire diameter of described composite monofilament is 0.30 ~ 1.5mm.
As a kind of concrete embodiment, concrete weaving method comprises the following steps:
Be wound up in warp beam with the single even tension of the composite monofilament of 0.45mm wire diameter, single tension force must ensure that unanimously single tension error is no more than 1cN, to ensure the definitely smooth of following fabric;
By the fabric construction of filter screen top layer 2/2, nexine 3/1 twill, upper machine through close be 200-400 root/10cm, on machine, filling density is that 100-150 root/10cm weaves, and grey cloth is breathed freely as 800-1500 L/m
2.s@127 Pa; Then by the process of filter screen high temperature critical point HEAT SETTING, stable dimensions, after process, the air permeability of finished product filter cloth is 500-900 L/m
2.s@127Pa.
The filter cloth product made by this technology, the production for certain enterprise's phosphate dihydrate horizontal belt vacuum machine domestic is filtered, respond well.
The filter screen of present invention process fabrication techniques has permanent resistive connection crystalline substance, permanent resistant to hydrolysis, permanently antifoulingly refuses the drainage that oil refuses dimensionally stable, high wear resistance and excellence under water, high temperature, effectively can improve production capacity and service life in the application of phosphoric acid industry.
The above; be only the present invention's preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (11)
1. one kind is applied to the filter screen of phosphoric acid industry, adopt composite monofilament to weave to form, it is characterized in that, described composite monofilament is skin-core structure, sandwich layer is PET polyester resin material, cortex is that the composite material of PP polypropylene and PTFE polytetrafluoroethylene (PTFE) forms through high temperature critical point sizing, and described critical point temperature is 120 DEG C ~ 180 DEG C, the texture of described filter screen be in plain weave, twill, satin weave, multiply cloth structure any one.
2. the filter screen being applied to phosphoric acid industry according to claim 1, it is characterized in that, described filter screen multiply cloth texture is the combination of top layer 3/1 twill and nexine 2/2 twill, or the combination of line and nexine 2/2 twill is forged on top layer 4/1, or the combination of line and nexine 3/1 twill is forged on top layer 4/1, or the combination of top layer 1/1 plain weave and nexine 3/1 twill.
3. the filter screen being applied to phosphoric acid industry according to claim 1, it is characterized in that, described filter screen is filling-backed weave, formed with a system warp yarns by the weft yarn (namely showing latitude and back weft) of identical or not identical two systems, comprise the hydrophobic layer of dam layer and the bottom on surface, the described layer that dams is twill, and hydrophobic layer is twill, and the layer that dams interweaves with hydrophobic layer and is connected.
4. the filter screen being applied to phosphoric acid industry according to any one of claim 1 ~ 3, is characterized in that, the yarn proportioning of described filter screen is 1:1.
5. the filter screen being applied to phosphoric acid industry according to claim 4, is characterized in that, the wire diameter of described composite monofilament is 0.30 ~ 1.5mm.
6. a weaving method for filter screen according to any one of claim 1 ~ 5, is characterized in that, mainly comprises the following steps:
(1) according to application operating mode, application purpose selection longitude and latitude wire diameter, the thread count of phosphoric acid;
(2) be wound in warp beam by single for composite monofilament even tension, single tension force 50-200 cN, ensure that single tension force is basically identical, single tension error is no more than 1cN simultaneously;
(3) according to technological requirement looming weaving, weaving tension is not less than 500 cN;
(4) carry out the process of high temperature critical point HEAT SETTING to filter screen, described temperature range is 120 DEG C ~ 180 DEG C;
Wherein, in step (2), composite monofilament is skin-core structure, and sandwich layer is PET polyester resin material, and cortex is the composite material of PP polypropylene and PTFE polytetrafluoroethylene (PTFE).
7. weaving method according to claim 6, is characterized in that, the texture of described filter screen be in plain weave, twill, satin weave, multiply cloth structure any one.
8. weaving method according to claim 6, it is characterized in that, described filter screen multiply cloth texture is the combination of top layer 3/1 twill and nexine 2/2 twill, or the combination of line and nexine 2/2 twill is forged on top layer 4/1, or the combination of line and nexine 3/1 twill is forged on top layer 4/1, or the combination of top layer 1/1 plain weave and nexine 3/1 twill.
9. weaving method according to claim 6, it is characterized in that, described filter screen is filling-backed weave, formed with a system warp yarns by the weft yarn (namely showing latitude and back weft) of identical or not identical two systems, comprise the hydrophobic layer of dam layer and the bottom on surface, the described layer that dams is twill, and hydrophobic layer is twill, and the layer that dams interweaves with hydrophobic layer and is connected.
10. weaving method according to claim 6, is characterized in that, the yarn proportioning of filter screen is 1:1 in step (1).
11. weaving method according to claim 6, is characterized in that, in step (2), the wire diameter of described composite monofilament is 0.30 ~ 1.5mm.
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| CN201410429823.6A CN104711746A (en) | 2014-08-28 | 2014-08-28 | Filter screen applied to phosphoric acid industry and weaving method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105220257A (en) * | 2015-09-14 | 2016-01-06 | 厦门厦迪亚斯环保过滤技术有限公司 | Brilliant and the modification monofilament of high-wearing feature of resistive connection and the preparation method of industrial filter screen |
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| 丁启圣等: "《新型实用过滤技术》", 30 June 2011, 冶金工业出版社 * |
| 熊杰: "《产业用纺织品》", 30 June 2007, 浙江科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105220257A (en) * | 2015-09-14 | 2016-01-06 | 厦门厦迪亚斯环保过滤技术有限公司 | Brilliant and the modification monofilament of high-wearing feature of resistive connection and the preparation method of industrial filter screen |
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