CN114247212B - Spunlace film-coated sticking strip and ultralow-emission dust removal filter bag - Google Patents
Spunlace film-coated sticking strip and ultralow-emission dust removal filter bag Download PDFInfo
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- CN114247212B CN114247212B CN202111559593.1A CN202111559593A CN114247212B CN 114247212 B CN114247212 B CN 114247212B CN 202111559593 A CN202111559593 A CN 202111559593A CN 114247212 B CN114247212 B CN 114247212B
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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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention relates to a preparation method of a spunlace film-coated strip, the spunlace film-coated strip and an ultra-low emission dust removal filter bag. The preparation method of the spunlace laminated adhesive tape comprises the following steps: the polyphenylene sulfide or polyphenylene sulfide mixed polytetrafluoroethylene fiber is fed into a spunlace entanglement reinforcement system after opening, mixing, carding, lapping and drafting, prewetting spunlace is carried out, then secondary spunlace is carried out, and the spunlace nonwoven fabric with certain mechanical properties and appearance is formed by a fiber web after spunlace. Through the spunlace film-coated adhesive tape and the ultra-low emission dust-removing filter bag adhered with the spunlace film-coated adhesive tape, the polyphenylene sulfide or polyphenylene sulfide spunlace film-coated non-woven fabric adhesive tape and a filter material sewing needle hole of the dust-removing filter bag can be well bonded together with a gap generated by lap joint, and the spunlace film-coated non-woven fabric adhesive tape has the advantages of attractive fusion seam and firm adhesion, prevents dust leakage of the sewing needle hole of the dust-removing filter bag and improves the filtering precision of the needle seam of the filter bag; can effectively replace the prior gluing or sewing and combining mode of PTFE sealing film and dust-removing filter bag.
Description
Technical Field
The invention relates to a spunlace film-coated sticker and an ultralow-emission dust-removing filter bag attached with the sticker, belonging to the field of manufacturing of industrial environment-friendly dust-removing filter bags.
Background
Because the sewing positions of the bag head, the bag body and the bag bottom of the dust removal filter bag have sewing needle holes and filter material lap joints, the dust removal filter bag repeatedly filters and removes dust for a long time in the operation process of the dust remover, and dust risks of permeating and even penetrating from the needle holes and the joints of the filter bag. According to the national standard bag filter sewing standard, the number of needles of a filter bag suture line within 10cm is 30-5 needles, the connector of the dust removal filter bag is generally sewn by adopting double needles and is tied into three circles, the bag body is sewn by adopting three needles, and the bag bottom is sewn by adopting double needles and is tied into two circles. The diameter of the sewing needle of the filter bag is about 0.5-2 mm except the diameter of the sewing thread, the diameter of each needle hole is calculated as 0.1mm, and the area of each needle hole is 0.00785mm 2 . The average particle diameter of the dust of PM2.5 is 2.5 μm, namely 0.0025mm, and the projection area is 0.00000491mm 2 . That is to say, each pinhole area can be penetrated by 1599 PM2.5 dust at the same time, and a dust removal filter bag with the caliber of 130mm and the length of 6000mm, the bag mouth needle density is 75/100mm, the perimeter of the bag mouth of 130mm is 408.2mm, the bag mouth needle density is 150/100mm, the whole bag mouth is provided with 612.3 pinholes, the bag body needle density is 75/100mm, the bag body is 4500 pinholes, the bag bottom is 150mm, the perimeter of the bottom is 471mm, the bag bottom needle density is 100/100mm, and the bag bottom pinholes are 471 pinholes. The total number of the whole filter bag is about 5583.3 pinholes, and the total pinhole area is 43.82mm 2 Can simultaneously allow 8.92x10 6 The PM2.5 dust passes through the filter bag, different bag body seam methods have different influences on the PM2.5 filtering efficiency of the bag type dust collector, and the sewing needle holes cause the PM2.5 filtering efficiency to be low due to the sewing of the filter bagThe main reason is.
In recent years, the environmental protection is gradually increased, especially the ultra-low emission standard of dust is provided, a new challenge is provided for the existing dust removal technology, in order to meet the increasingly strict environmental protection requirement and reduce the risk of over-standard emission caused by dust leakage from a filter bag needle hole and a gap, at present, enterprises mostly adopt two processes of online gluing and PTFE tape pasting, the needle hole of a filter bag body is subjected to leakage prevention treatment, but the two processes have defects, glue liquid is not easy to dry in a short time in the online gluing process, the glue liquid is easy to adhere to the filter bag body and an operator, the environment is not protected and the appearance is not attractive, the glue liquid turns yellow and fails under high-temperature and corrosive working conditions, the needle hole leakage prevention effect cannot be achieved, and the PTFE tape is a material with excellent high-temperature resistance and stable chemical performance, but is adhered to a suture line instead of hot-pressing fusion of the PTFE tape and is adhered by an adhesive, once the adhesive fails, the PTFE tape is integrally separated, and the risk of dust leakage from the needle hole exists.
Disclosure of Invention
In order to solve the aforementioned problems of the prior art, the present applicant has provided a spunlace coating tape which has excellent adhesion effect and prevents fine dust from penetrating through pinholes and gaps, and an ultra-low emission dust filter bag to which the spunlace coating tape is adhered.
The invention relates to a preparation method of a spunlace laminated adhesive tape, which is characterized by comprising the following steps:
1) Opening, mixing, carding, lapping and drafting polyphenylene sulfide or polyphenylene sulfide and polytetrafluoroethylene mixed fiber;
2) Feeding the fiber web into a spunlace entanglement reinforcement system, carrying out prewetting spunlace, and carrying out secondary spunlace, wherein the gram weight of the spunlace nonwoven fabric subjected to spunlace is 80-100g/m 2 ；
3) Baking the spunlaced non-woven fabric for 6-10 minutes at 160-200 ℃ after spunlacing;
4) And shearing the dried spunlace nonwoven fabric according to the requirement, and covering a layer of polytetrafluoroethylene microporous film on the surface of the sheared spunlace nonwoven fabric.
Preferably, the dried spunlace nonwoven fabric in the step 4) is cut into 1500mm small webs from 3200mm wide webs.
Preferably, the aperture of the polytetrafluoroethylene microporous film is 0.2-15 microns, the thickness of the polytetrafluoroethylene microporous film is 15-30 microns, the void ratio is 80-97%, the fastness is not less than 0.03MPa, and the gram weight is 8-10g/m 2 。
The invention also relates to a spunlace film-coated strip prepared by the preparation method of the spunlace film-coated strip.
The invention also relates to an ultra-low emission dust-removing filter bag, which is characterized in that the water-jet membrane sticking strips are stuck and covered at the bag head, the bag body, the bag bottom sewing needle hole and the lap joint seam of the bag body main body of the dust-removing filter bag.
Preferably, the spunlace film-covering strip is hot-pressed and covered on the dust-removing filter bag through a film sticking machine.
Preferably, the thickness of the bag body main body of the dust-removing filter bag is 1-3.5 mm, and the thickness of the spunlace film-covering adhesive tape is 0.2-0.3 mm.
Preferably, hot pressing mechanism comprises hot-blast main, compression roller and rubber roller, and its concrete parameter is: the hot air temperature is 100-620 ℃, and the film sticking speed is 4-10m/mim; the width of the sticking film is 30-35mm, and the laminating pressure is 0.2-1 MPa.
Through the spunlace coated adhesive tape and the ultra-low emission dust-removing filter bag adhered with the spunlace coated adhesive tape, resin with narrow molecular weight distribution is obtained by adding a molecular weight regulator into p-dichlorobenzene and sodium sulfide as polyphenylene sulfide fiber raw materials and carrying out polycondensation in a polar organic solvent, and the resin has a melting point of 285 ℃, has partial crystallization and tropism, has excellent adhesive property, is very suitable for a hot-melt adhering process, can well adhere the polyphenylene sulfide or polyphenylene sulfide spunlace coated non-woven fabric adhesive tape and a filter material sewing needle hole of the dust-removing filter bag and a gap generated by lap joint, and has attractive weld seam and firm adhesion, prevents dust leakage of the sewing needle hole of the dust-removing filter bag and improves the filtering precision of the needle seam of the filter bag; can effectively replace the prior gluing or sewing and combining mode of PTFE sealing film and dust-removing filter bag.
Drawings
FIG. 1 is a schematic view of an ultra-low emission dust bag of the present invention having a spunlace overlaminate strip applied thereto.
FIG. 2 is a schematic view of three longitudinal interlocking seams at the bottom of the ultra-low emission dust filter bag of the present invention.
1-polyphenylene sulfide or polytetrafluoroethylene mixed polyphenylene sulfide microporous membrane adhesive tape; 2-three longitudinal interlocking seams of the bag body of the dust removal filter bag; 3-main body of dust-removing filter bag.
Detailed Description
The invention is described in detail below with reference to fig. 1 and 2 and the specific embodiments.
The invention provides a novel spunlace film-covering sticker, namely a spunlace film-covering sticker 1 made of polyphenylene sulfide or polytetrafluoroethylene mixed polyphenylene sulfide, which is covered on a bag head, a bag body and a bag bottom sewing needle hole and lap joint gaps of a dust-removing filter bag as shown in figure 1, so that the needle hole leakage prevention of the sewing needle hole of the filter bag is improved, and the filtering precision is improved.
The invention further provides an ultralow-emission dust-removing filter bag covered with the spunlace film sticker, which comprises a dust-removing filter bag body main body 3, wherein the dust-removing filter bag body main body 3 is divided into a bag head, a bag body and a bag bottom. The polyphenylene sulfide or polytetrafluoroethylene mixed polyphenylene sulfide spunlace coating sticking strip 1 is stuck on the bag body main body 3 of the dust-removing filter bag, the spunlace coating sticking strip 1 is heated by a hot air pipe of a film sticking machine through the hot air pipe of the spunlace coating sticking strip 1, and then the spunlace coating sticking strip 1 is pressed and stuck on the bag head, the bag body, the bag bottom sewing needle hole and the lap joint gap of the bag body main body 3 of the dust-removing filter bag through a compression roller and a rubber roller. The thickness of the bag body 3 of the dust-removing filter bag is generally 1-3.5 mm, and the thickness of the spunlace film-covering adhesive strip 1 of polyphenylene sulfide or polyphenylene sulfide-polytetrafluoroethylene mixture is 0.2-0.3 mm.
The spunlace film-coating paste prepared by mixing the polyphenylene sulfide or the polyphenylene sulfide with polytetrafluoroethylene is prepared as follows:
the polyphenylene sulfide or polyphenylene sulfide mixed polytetrafluoroethylene fiber is fed into a spunlace entanglement reinforcement system after opening, mixing, carding, lapping and drafting according to different proportions (preferably 7) to carry out prewetting spunlace, and then secondary spunlace is carried out, and the spunlace fiber web becomes a spunlace with certain mechanical properties and appearance after spunlaceThe gram weight of the spunlace nonwoven fabric is 80-100g/m 2 。
When the selected fibers are fed to a carding machine through opening and mixing, the grammage of the fiber layer produced by carding is preferably 80-100g/m 2 The width of the product is 3200mm, and the important technological parameters of the carding machine are shown in the table 1:
the spunlace step is to feed the fiber web after carding, forming and drafting into a spunlace entanglement reinforcement system for spunlacing, firstly, the fiber web is sent into a spunlace region for pre-wetting treatment, the pre-wetting treatment enables the fiber web to be more compact, air in the fiber web is removed, the fiber web can absorb the energy of the spunlace more effectively, and the fiber entanglement effect in the spunlace process is enhanced; the prewetted fiber web is conveyed to a drum spunlace area by a net conveying curtain to enter a high-pressure water jet to be entangled and reinforced, and after 6 times of water needling, the fiber web is further reinforced, the structure is stable, and fibers are effectively entangled.
The process conditions for the hydroentangling step are shown in table 2:
and (3) annotation: 0.10mm is the small aperture, 40 is 40 holes per inch, 1 is a single needle plate
The specific steps of drying after hydroentangling are shown in table 3:
| speed m/min | Oven temperature deg.C | Time min | |
| Drying the mixture | 6-10 | 160-200 | 6-10 |
And cutting the dried polyphenylene sulfide or polytetrafluoroethylene mixed polyphenylene sulfide spunlaced nonwoven fabric into small pieces with the width of 1500mm, wherein the large pieces are 3200mm, and the small pieces are processed and manufactured in the next procedure.
Covering a layer of polytetrafluoroethylene microporous film on the cut polytetrafluoroethylene and polyphenylene sulfide spunlace non-woven fabric, wherein the pore diameter of the microporous film is 0.2-15 mu m, the thickness of the microporous film is 15-30 mu m, the void ratio is 80-97%, and the fastness is not less than 0.03MPa; the gram weight of the microporous membrane is 8-10g/m 2 And the PM2.5 dust filtering efficiency can reach more than 99%. The Polytetrafluoroethylene (PTFE) film has a smooth surface and is resistant to chemical substances, and is coated on the surface layer of a common filter material to play a role of a disposable dust layer, so that dust is completely trapped on the surface of the film, and surface layer filtration is realized; the surface of the film is smooth, so that the film has excellent chemical stability, is not aged and is hydrophobic, so that dust trapped on the surface is easy to peel off, and the service life of the filter material is prolonged. For example, when the pore diameter of the membrane is between 0.2 and 15 micrometers (preferably between 7 and 8 micrometers), the filtration efficiency can reach more than 99 percent, and almost zero emission is realized. The porosity is not changed after ash removal, and the dust removal efficiency is always high.
The polytetrafluoroethylene coating process is shown in table 4:
| speed m/min | Film coating temperature C | Rice rolling speed | Pressure Mpa | |
| Film coating | 7-15 | 160-260 | 6-10 | 0.1-0.5 |
And cutting the polytetrafluoroethylene and polyphenylene sulfide spunlaced non-woven fabric coated with the microporous membrane into adhesive strips with the width of 30mm by a strip cutting machine according to the width of the needle seam of the bag body of the filter bag for later use.
The filter material slitting and strip pasting process is shown in table 5:
the cut polytetrafluoroethylene and polyphenylene sulfide spunlace film-coated adhesive tape is covered on a sewing needle hole and a lap joint gap at the longitudinal seam lapping joint of a filter bag through hot pressing, and the hot pressing comprises a hot air pipe, a pressing roller and a rubber roller, and the specific parameters are as follows: the hot air temperature is 100-620 ℃, and the film sticking speed is 4-10m/mim; the width of the adhesive film is 30-35mm, and the laminating pressure is 0.2-1 MPa.
Main parameters table 6:
the gluing process, the PTFE tape pasting process and the polyphenylene sulfide or polyphenylene sulfide mixed polytetrafluoroethylene pasting process are compared with each other in terms of heat resistance, acid and alkali resistance and filtering efficiency
1.1 comparison of Heat resistance
A test sample with the specification of 5 multiplied by 5cm is placed in a high-temperature oven to be subjected to heat treatment for 24 hours at the temperature of 200 ℃, and then the appearance change condition of the test sample is observed, and the comparison between the samples manufactured by the processes of gluing, pasting a PTFE adhesive tape and pasting a polyphenylene sulfide spunlace film is carried out before and after the high-temperature treatment, so that the appearance color of the glued sample is slightly pale yellow, the sealant is firmly adhered with the filter material, the PTFE adhesive tape is obviously shrunk, and obvious deep yellow substances are seeped out from the edge of the PTFE adhesive tape. Therefore, it can be stated that the fusion of the PTFE tape with the suture does not rely on the PTFE to be hot-melted with the filter bag but on the adhesive to adhere. This type of bonding is not suitable for high temperature environments.
The preparation conditions and parameters of the polyphenylene sulfide spunlace coating film and the polyphenylene sulfide mixed polytetrafluoroethylene spunlace coating film of the test sample are basically the same and are approximately as follows: the gram weight of the spunlaced nonwoven fabric after spunlace is 92g/m 2 Baking the spunlaced nonwoven fabric for 8 minutes at 180 ℃ after spunlacing, wherein the aperture of the polytetrafluoroethylene microporous film is 7 micrometers, the thickness of the polytetrafluoroethylene microporous film is 25 micrometers, the porosity of the polytetrafluoroethylene microporous film is 88 percent, the fastness is not less than 0.03MPa, and the gram weight of the polytetrafluoroethylene microporous film is 9g/m 2 . When the polyphenylene sulfide is mixed with polytetrafluoroethylene, the mixing ratio is 7.
Heat resistance apparent comparison Table 7
1.2 comparison of acid and alkali resistance
Sulfur in coal is combusted to generate SO2, and sulfuric acid with extremely strong corrosivity is formed by oxidation and contact with water, SO that sealing glue and PTFE adhesive tape for pinhole sealing are influenced to a certain extent. In order to simulate the acid corrosion environment of the actual working condition, a test sample with the specification of 5 multiplied by 5cm is placed in 35% sulfuric acid solution, the apparent change of the test sample is observed after the test sample is soaked for 24 hours, the appearance color of the sample treated by the gluing process is not obviously changed after the sample is treated by the sulfuric acid solution, the colloid is slightly sticky, the PTFE adhesive tape falls off and is separated from the filter material base material after the sample treated by the PTFE adhesive tape pasting process is treated by the sulfuric acid solution, the reason may be that the adhesive of the PTFE adhesive tape is not acid-resistant to cause the PTFE adhesive tape to fall off, and the polyphenylene sulfide pasting and polyphenylene sulfide mixed polytetrafluoroethylene spunlace composite film pasting are firmly adhered to the filter material base material without change; therefore, in engineering application, the gluing process and the PTFE adhesive tape are easy to fall off in an acid corrosion environment, the pinhole sealing is ineffective, and the risk of dust leakage exists, so that the polyphenylene sulfide spunlace coating film and the polyphenylene sulfide polytetrafluoroethylene-mixed spunlace coating film are more suitable for the environment with over-strong acid corrosion.
Acid and alkali resistance apparent comparison table 8
| Item | 30％H 2 SO 4 /24H |
| Gluing process | Glue stick hand |
| PTFE (Polytetrafluoroethylene) adhesive tape pasting process | PTFE adhesive tape is separated from filter bag |
| Process for sticking polyphenylene sulfide spunlace film | Without change |
| Spunlaced laminating process for pasting polyphenylene sulfide and polytetrafluoroethylene | Without change |
1.3 comparison of filtration efficiency of three strip pasting processes
Cutting the three kinds of strip-sticking process filter materials into 20cm-20cm samples, clamping the samples on a sample round table, and adopting enough tension to enable the samples to be flat without deformation during sample clamping. Starting a suction fan or other devices to make air pass through the sample, adjusting the flow rate, and recording the airflow flow rate and the filtering efficiency after the pressure drop gradually approaches a specified value or reaches a stable value. Under the same conditions, the assay was repeated at least 10 times at different sites of the same sample.
The experimental data are shown in Table 9
From the experimental data in table 9, it can be seen that the filtration efficiency is almost the same when the PTFE tape is adhered and the polyphenylene sulfide spunlace film is adhered, and the filtration efficiency of the gluing process is poor. However, in the heat resistance and alkali resistance experiments of tables 7 and 8, the PTFE adhesive tape has a shrinkage phenomenon at high temperature, is obviously layered and is not suitable for being used under high temperature and corrosive conditions, while the polyphenylene sulfide spunlace coating film or the polyphenylene sulfide mixed PTFE spunlace coating film sticking strip invented by the applicant has high temperature resistance and corrosion resistance, has the dust removal efficiency of reaching more than 99% on respirable particles (PM 2.5), almost reaches 100% on respirable particles (PM 10), has very excellent dust removal efficiency and achieves the effect of ultra-low emission.
The previous description is only for the purpose of describing particular embodiments of the present disclosure, so as to enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. The ultra-low emission dust-removing filter bag is characterized in that spunlace film-covering strips are bonded to a bag head, a bag body, a bag bottom sewing needle hole and lap joint gaps of a bag body main body of the dust-removing filter bag in a hot-pressing mode, wherein the thickness of the bag body main body of the dust-removing filter bag is 1 to 3.5mm, the thickness of the spunlace film-covering strips is 0.2 to 0.3mm, a hot-pressing mechanism consists of a hot air pipe, a pressing roller and a rubber roller, and the specific parameters are as follows: the hot air temperature is 100 to 620 ℃, and the film pasting speed is 4 to 10m/mim; the width of the adhesive film is 30 to 35mm, and the covering pressure is 0.2 to 1MPa;
the preparation method of the spunlace laminated adhesive tape comprises the following steps:
1) Opening, mixing, carding, lapping and drafting polyphenylene sulfide and polytetrafluoroethylene mixed fibers with the mixture ratio of 7;
the important technological parameters of the carding machine are as follows:
temperature: 20-25 DEG C
Humidity: 65-80 percent
Diameter of the main cylinder: 1500mm
Main cylinder rotating speed: 1000rpm
Weight per gram of cotton layer: 80-100
2) Feeding the fiber web into a spunlace entanglement reinforcement system, carrying out prewetting spunlace, and carrying out secondary spunlace, wherein the gram weight of the spunlace nonwoven fabric subjected to spunlace is 80 to 100g/m 2 ；
The process conditions of the spunlace step are as follows:
the number of the water stabs: 6
Number of pumps: 6
Pressure at the water jet head: 90-340 bar
A water needle plate: 0.10-40-1
3) Baking the spunlaced non-woven fabric for 6 to 10 minutes at 160 to 200 ℃ after spunlacing;
4) Shearing the dried spunlace nonwoven fabric according to the requirement, and covering a layer of polytetrafluoroethylene microporous film on the surface of the sheared spunlace nonwoven fabric;
wherein the aperture of the polytetrafluoroethylene microporous film is 0.2 to 15 mu m, the thickness of the polytetrafluoroethylene microporous film is 15 to 30 mu m, the void ratio is 80 to 97 percent, the fastness is more than or equal to 0.03MPa, and the gram weight is 8 to 10g/m 2 ；
Wherein, in the step 4), the dried spunlace nonwoven fabric is cut into 1500mm small webs with the width of 3200 mm.
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| CN115382298A (en) * | 2022-09-22 | 2022-11-25 | 清源创新实验室 | Filtering material for solid-liquid separation, filter bag and online regeneration method thereof |
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| JP5410920B2 (en) * | 2009-10-23 | 2014-02-05 | 中尾フイルター工業株式会社 | Heat welding tape for filters |
| CN104436866B (en) * | 2014-10-08 | 2016-03-30 | 上海金由氟材料股份有限公司 | A kind of preparation method of free of pinholes dedusting filtering bag |
| CN104958955B (en) * | 2015-06-03 | 2017-03-01 | 江苏新中环保股份有限公司 | A kind of production method of bag-type dusting filtrate |
| CN105058773A (en) * | 2015-07-21 | 2015-11-18 | 安徽省元琛环保科技有限公司 | Hot melting seaming technique for polytetrafluoroethylene composite filter bag |
| CN205886401U (en) * | 2016-07-21 | 2017-01-18 | 南京龙源环保有限公司 | Coal fired power plant is filter bag for minimum discharge |
| CN206414887U (en) * | 2016-12-29 | 2017-08-18 | 浙江格尔泰斯环保特材科技股份有限公司 | PTFE filter bags |
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