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CN113426214A - V-shaped opening technical filter bag with large dust holding capacity - Google Patents

V-shaped opening technical filter bag with large dust holding capacity Download PDF

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Publication number
CN113426214A
CN113426214A CN202110809664.2A CN202110809664A CN113426214A CN 113426214 A CN113426214 A CN 113426214A CN 202110809664 A CN202110809664 A CN 202110809664A CN 113426214 A CN113426214 A CN 113426214A
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China
Prior art keywords
filter
bag
bag body
layer
filter layer
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Pending
Application number
CN202110809664.2A
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Chinese (zh)
Inventor
张森
肖友波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Senyuan Environmental Technology Co ltd
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Anhui Senyuan Environmental Technology Co ltd
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Priority to CN202110809664.2A priority Critical patent/CN113426214A/en
Publication of CN113426214A publication Critical patent/CN113426214A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42Auxiliary equipment or operation thereof
    • B01D46/4227Manipulating filters or filter elements, e.g. handles or extracting tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42Auxiliary equipment or operation thereof
    • B01D46/44Auxiliary equipment or operation thereof controlling filtration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022Non-woven fabric
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00Layers arrangement
    • B32B2250/20All layers being fibrous or filamentary
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02Synthetic macromolecular fibres
    • B32B2262/0253Polyolefin fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02Synthetic macromolecular fibres
    • B32B2262/0276Polyester fibres

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention discloses a V-shaped opening technical filter bag with large dust holding capacity, which comprises a bag body, wherein the top of the bag body is provided with a bag opening, the two sides and the bottom edge of the bag body are both in an ultrasonic welding structure, the bag opening is in a V-shaped structure, a filter cylinder is arranged in the bag body, a filter opening is arranged in the bag opening and communicated with the inside of the filter cylinder, the bag body is made of nano non-woven fabrics, and the bag body is composed of a filter layer and a protective layer. The invention adopts the combination of double-layer ES fiber hot air cotton, melt-blown cloth and spun-bonded cloth, the melt-blown cloth adopts a wave structure and is embedded between the ES fiber hot air cotton, triple filtration is effectively realized, the maximization of filtration is ensured, the filtration efficiency is ensured, meanwhile, the filtration area of the filter bag is also improved, the continuous filtration effect is also improved, the service cycle of the bag body is prolonged, and meanwhile, the ES fiber hot air cotton, the melt-blown cloth and the spun-bonded cloth are all environment-friendly materials and are treated by burning.

Description

V-shaped opening technical filter bag with large dust holding capacity
Technical Field
The invention relates to the technical field of filter bags, in particular to a technical filter bag with a V-shaped opening and large dust holding capacity.
Background
The filtering material is mainly used for collecting particle dust and various suspended matters, is generally arranged on exhaust equipment and ventilation equipment and is used for filtering air, and can filter dust particles in the air and stay on the filtering material, so that the air purification effect is achieved.
At present, the filtering material on the market indicates more and crosses the filter bag, it mainly includes non-woven fabrics filter bag and glass fiber filter bag to cross the filter bag, the filtration of non-woven fabrics filter bag mainly comprises ES fibre hot-blast cotton, double-deck melt-blown fabric and spun-bonded fabric combination, initial filtration efficiency is higher, but the filtration efficiency decay is very fast, the life cycle is short, and the filtration of glass fiber filter bag mainly comprises glass fiber cotton and spun-bonded fabric combination, it is higher and have the ability of receiving the oil mist to filter the continuation efficiency, but the fine major component of glass is the silicide, lead to unable burning and degradation, and is not environmental protection. Therefore, a V-shaped opening technical filter bag with large dust holding capacity is provided.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides the filter bag with the V-shaped opening technology and the dust holding capacity is large, and the problems that the non-woven fabric filter bag is fast in filtering attenuation, short in service cycle and not environment-friendly are effectively solved.
The invention adopts a modified technical scheme to solve the technical defects, and provides a V-shaped opening technical filter bag with large dust holding capacity.
As a further preferable mode of the present invention, the filter cartridges are of a conical structure, the filter cartridges are uniformly distributed in the bag body in the transverse direction, the filter cartridges are equal in size, and the expansion-preventing parting strips are arranged between the filter cartridges.
As a further preferable mode of the present invention, the expansion-preventing parting strips are uniformly distributed between the filter cartridges, and a stitch-type sewing structure is adopted.
As a further preferable mode of the present invention, the filter layer is an inner layer of the bag body, the protective layer is an outer layer of the bag body, the filter layer includes a first filter layer, a second filter layer and a third filter layer, and the first filter layer, the second filter layer and the third filter layer are sequentially distributed from inside to outside.
As a further preferable mode of the present invention, the first filter layer and the third filter layer are made of ES fiber hot air cotton, the second filter layer is made of wavy melt-blown fabric, and the protective layer is made of spun-bonded fabric.
The invention has the following beneficial effects:
this nanometer non-woven fabrics filter bag adopts double-deck ES fibre hot-blast cotton, melt-blown cloth and spunbonded fabric combination constitute, melt-blown cloth adopts the wavy structure and gomphosis between ES fibre hot-blast cotton, the effectual triple filtration that has realized, filterable maximize has been guaranteed, filterable efficiency has been ensured, the melt-blown cloth of wavy structure simultaneously, when filtering, can reduce the resistance that the air produced the bag body, filter cloth holds the dirt volume simultaneously also to have improved, effectively improved the filter area who crosses the filter bag and last filterable effect, the life cycle of the bag body has been prolonged, ES fibre hot-blast cotton simultaneously, melt-blown cloth and the equal environmental protection material of spunbonded fabric, handle through burning.
Drawings
FIG. 1 is a schematic view of the overall appearance of the filter bag of the present invention;
FIG. 2 is a side view of the filter bag of the present invention;
FIG. 3 is a cross-sectional view of the filter bag of the present invention;
FIG. 4 is a schematic view of the filter bag structure of the present invention.
In the figure, 1-a bag body, 2-a bag opening, 3-a filter opening, 4-a filter cylinder, 5-an anti-expansion parting strip, 6-a first filter layer, 7-a second filter layer, 8-a third filter layer and 9-a protective layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a technical scheme that: a V-shaped opening technical filter bag with large dust holding capacity comprises a bag body 1, a bag opening 2 is arranged at the top of the bag body 1, the two sides and the bottom edge of the bag body 1 are both in hot melting connection structure, the bag mouth 2 is in a V-shaped structure, a filter cartridge 4 is arranged in the bag body 1, a filter port 3 is arranged in the bag opening 2, the filter port 3 is communicated with the interior of the filter cartridge 4, the bag body 1 is made by nanometer non-woven fabrics material, the bag body 1 comprises filter layer and protective layer 9, and the bag body adopts V type design, ensures that the air current evenly sees through the filter material, and the 1 filter area maximize of the bag body that makes utilizes, the effectual filtration efficiency that improves the bag body 1, and the corner of the bag body 1 adopts the hot melt mode, has realized the integration of the 1 structure of the bag body, and the mode of hot melt simultaneously ensures that the 1 corner of the bag body is connected inseparabler, and is not fragile.
As a further preferable mode of the present invention, the filter cartridges 4 are of a conical structure, the filter cartridges 4 are uniformly distributed in the bag body 1 in the transverse direction, the filter cartridges 4 have the same size, the expansion-preventing partition bars 5 are arranged between the filter cartridges 4, the filter cartridges 4 of the conical structure can maximize the filtering area, and meanwhile, during filtering, the filter cartridges 4 of the conical structure have the characteristics of low resistance and low energy consumption, so that the service life of the bag body 1 is prolonged.
As a further preferable mode of the present invention, the anti-swelling partition bars 5 are uniformly distributed between the filter cartridges 4, the anti-swelling partition bars 5 adopt a stitch type sewing structure, the anti-swelling partition bars 5 prevent the bag bodies from being shielded from each other, and a plurality of parallel equidistant anti-swelling partition bars 5 form a linking support between the filter cartridges 4, thereby avoiding the situation of homogenizing the filter area by local high wind speed, and the height and the distance of the anti-swelling partition bars 5 are 35mm and 70mm, respectively.
As a further preferable mode of the present invention, the filter layer is an inner layer of the bag body 1, the protective layer 9 is an outer layer of the bag body 1, the filter layer includes a first filter layer 6, a second filter layer 7 and a third filter layer 8, the first filter layer 6, the second filter layer 7 and the third filter layer 8 are sequentially distributed from inside to outside, the bag body 1 is a filter bag made of a composite material, the three filter layers can effectively achieve an optimal filter effect, and the protective layer 9 can protect the filter layers.
As a further preferable mode of the present invention, the first filter layer 6 and the third filter layer 8 are made of ES fiber hot air cotton, the second filter layer 7 is made of a wavy melt-blown fabric, the protective layer 9 is made of a spun bond fabric, the ES fiber is a sheath-core composite fiber obtained by combining a low-melting-point component and a high-melting-point component, and has excellent thermal bonding characteristics, the low-melting-point component in the ES fiber is melted under a thermal treatment condition higher than the melting point of the low-melting-point component and is bonded with other materials, so that an adhesive-free environment-friendly non-woven fabric can be formed, and the fabric has the characteristics of high bulkiness, good elasticity, soft hand feeling, strong heat retention, good air permeability, good water permeability and the like, and mainly achieves the effects of heat preservation, heat insulation, moisture resistance and the like, the diameter of the melt-blown fabric can reach 1 to 5 microns, many gaps, a fluffy structure, good wrinkle resistance, and is matched with the design of a wavy structure, the air resistance is effectively reduced, the dust holding capacity of the filter cloth is improved, the spunbonded cloth is high-performance composite cloth, and has the characteristics of moisture resistance, moisture resistance and high temperature resistance, and the filter layer is effectively protected.
In summary, according to the design of the filter bag with the V-shaped opening, when the bag body is used for filtering, air flow can be ensured to uniformly pass through the bag body, meanwhile, the filtering area of the bag body can be maximized through the V-shaped opening, the resistance generated by air flow can be effectively reduced through the filter cartridge with the conical structure, energy consumption is reduced, the service life of the bag body is prolonged, the filtering maximization can be ensured through the double-layer ES fiber hot air cotton combined with the wavy melt-blown cloth, the filtering efficiency is ensured, and meanwhile, the dust holding capacity of the filter cloth is improved while the air resistance is reduced through the melt-blown cloth with the wavy structure.
Example 2
The non-woven fabric filter bag is mainly made by combining ES fiber hot air cotton, melt-blown cloth and spun-bonded cloth, the ES fiber hot air cotton, the melt-blown cloth and the spun-bonded cloth are all cloth with a planar structure, during manufacturing, the melt-blown cloth adopts a double-layer structure, the ES fiber hot air cotton, the melt-blown cloth and the spun-bonded cloth are sequentially arranged and combined from inside to outside, an opening of a bag body adopts a V-shaped structure, a filter cartridge adopts a straight-tube structure, anti-expansion partition lines between the filter cartridges are compounded by ultrasonic hot melting, the height and the distance of the anti-expansion partition lines are respectively 40mm and 70mm, during filtering, air firstly passes through the ES fiber hot air cotton and then passes through the melt-blown cloth to achieve the filtering effect, when the number of bonded dust particles on the ES fiber hot air cotton and the melt-blown cloth is large, the filter bag can be replaced, and the used filter bag is generally treated by burning.
Example 3
The glass fiber filter bag is mainly made of glass fiber cotton and spun bond cloth, when in manufacture, the glass fiber cotton and the spun bond cloth are sequentially arranged and combined from inside to outside, the opening of the bag body adopts a V-shaped structure, the filter cylinders adopt a conical structure, the anti-expansion separation lines between the filter cylinders adopt a stitch sewing structure, the height and the spacing of the anti-expansion separation lines are respectively 35mm and 70mm, the glass fiber cotton is a main filter layer, when in filtration, when air passes through the glass fiber cotton, dust particles in the air are retained in pores in the glass fiber cotton, thereby achieving the filtration effect, as the main components in the glass fiber cotton comprise silicon dioxide, aluminum oxide, calcium oxide, boron oxide, magnesium oxide, sodium oxide and the like, wherein silicide is a main component (accounting for 50 percent), the glass fiber has the advantages of good insulation, strong heat resistance, good corrosion resistance, high mechanical strength and the like, make glass fiber cotton have good lasting filter effect, have simultaneously and receive the oil mist ability, when the dirt particle on glass fiber cotton is more, to cross the filter bag change can, because the reason of glass fiber composition, lead to the bag body can't burn and degrade, to the fine filter bag of glass after the use, need the manual work to retrieve and carry out secondary operation and handle.
The above examples 1-3 respectively adopted the filtration structures of the nanometer non-woven fabric filter bag, the non-woven fabric filter bag and the glass fiber filter bag, and the following tables show the three filter bag analysis comparison conditions.
Figure RE-GDA0003223255700000061
Figure RE-GDA0003223255700000071
It is very obvious, through the above-mentioned table, three kinds of filtration bags are the filtration of three kinds of differences, the non-woven fabrics filter bag initial efficiency is higher, but filtration efficiency decay is fast, life cycle is short and comprehensive cost is high, and glass fiber filter bag filters the comparatively obvious just life cycle of efficiency effect, but glass fiber material can not burn and degrade, it is difficult to have increased the processing, environmental protection not, the nanometer non-woven fabrics filter bag has had the advantage that non-woven fabrics filter bag and glass fiber filter bag simultaneously concurrently, make bag body filtration more perfect, the filter effect is more obvious.
The following table shows the resistance changes of the nano non-woven fabric filter bag, the glass fiber filter bag and the non-woven fabric filter bag in the same service cycle.
Figure RE-GDA0003223255700000072
Figure RE-GDA0003223255700000081
Obviously, the initial resistance value of the corrugated nano non-woven fabric is 20% lower than that of the glass fiber cotton and is nearly 50% lower than that of the non-woven fabric filter bag, and meanwhile, the resistance difference is kept consistent and even increased during continuous filtration.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. The utility model provides a V-arrangement opening technique that holds dirt volume is big crosses filter bag, a serial communication port, including the bag body (1), the top of the bag body (1) is equipped with sack (2), the both sides and the base of the bag body (1) all adopt ultrasonic bonding structure, sack (2) are "V" type structure, the inside of the bag body (1) is equipped with cartridge filter (4), the inside of sack (2) is equipped with filter (3), filter (3) and cartridge filter (4) inside intercommunication, the bag body (1) is made by the nanometer non-woven fabrics material, the bag body (1) comprises filter layer and protective layer (9).
2. The V-shaped technical filter bag with the large dust holding capacity is characterized in that the filter cartridges (4) are of a conical structure, the filter cartridges (4) are uniformly distributed in the bag body (1) in the transverse direction, the filter cartridges (4) are identical in size, and anti-expansion partition strips (5) are arranged between the filter cartridges (4).
3. The V-shaped opening technical filter bag with large dust holding capacity as claimed in claim 2, wherein the anti-expansion parting strips (5) are uniformly distributed between the filter cartridges (4), and the anti-expansion parting strips (5) adopt a stitch sewing structure.
4. The V-shaped opening technical filter bag with the large dust holding capacity according to claim 1, characterized in that the filter layer is an inner layer of the bag body (1), the protective layer (9) is an outer layer of the bag body (1), the filter layer comprises a first filter layer (6), a second filter layer (7) and a third filter layer (8), and the first filter layer (6), the second filter layer (7) and the third filter layer (8) are sequentially distributed from inside to outside.
5. The V-shaped opening technical filter bag with large dust holding capacity according to claim 4, characterized in that the first filter layer (6) and the third filter layer (8) are made of ES fiber hot air cotton, the second filter layer (7) is made of wave-shaped melt-blown fabric, and the protective layer (9) is made of spun-bonded fabric.
CN202110809664.2A 2021-07-17 2021-07-17 V-shaped opening technical filter bag with large dust holding capacity Pending CN113426214A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2276647A1 (en) * 1998-07-21 2000-01-21 Freudenberg, Carl Dust filter bag
JP2007050464A (en) * 2005-08-17 2007-03-01 Senjoo:Kk Filter unit
JP2010242255A (en) * 2009-04-06 2010-10-28 Kurashiki Seni Kako Kk Composite nonwoven fabric for sanitary mask and method for producing the same
CN207203694U (en) * 2017-09-18 2018-04-10 重庆辰滤科技有限公司 Synthetic fibers bag filter
CN210332009U (en) * 2019-08-01 2020-04-17 东莞市恒永滤材科技有限公司 Multi-layer composite dust filtering bag
CN212700911U (en) * 2020-07-10 2021-03-16 辽宁实发洁净科技有限公司 Long-acting type filter bag melt-blown filter material

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2276647A1 (en) * 1998-07-21 2000-01-21 Freudenberg, Carl Dust filter bag
US6193773B1 (en) * 1998-07-21 2001-02-27 Firma Carl Freudenberg Dust filter bag
JP2007050464A (en) * 2005-08-17 2007-03-01 Senjoo:Kk Filter unit
JP2010242255A (en) * 2009-04-06 2010-10-28 Kurashiki Seni Kako Kk Composite nonwoven fabric for sanitary mask and method for producing the same
CN207203694U (en) * 2017-09-18 2018-04-10 重庆辰滤科技有限公司 Synthetic fibers bag filter
CN210332009U (en) * 2019-08-01 2020-04-17 东莞市恒永滤材科技有限公司 Multi-layer composite dust filtering bag
CN212700911U (en) * 2020-07-10 2021-03-16 辽宁实发洁净科技有限公司 Long-acting type filter bag melt-blown filter material

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Application publication date: 20210924

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