CN203748715U - Electrostatic dust collection mask - Google Patents
Electrostatic dust collection mask Download PDFInfo
- Publication number
- CN203748715U CN203748715U CN201420122120.4U CN201420122120U CN203748715U CN 203748715 U CN203748715 U CN 203748715U CN 201420122120 U CN201420122120 U CN 201420122120U CN 203748715 U CN203748715 U CN 203748715U
- Authority
- CN
- China
- Prior art keywords
- mouth mask
- filter
- face
- mask body
- nose
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000000428 dust Substances 0.000 title abstract description 13
- 210000001331 Nose Anatomy 0.000 claims abstract description 47
- 239000004744 fabric Substances 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims abstract description 15
- 230000000844 anti-bacterial Effects 0.000 claims abstract description 5
- 206010049244 Ankyloglossia congenital Diseases 0.000 claims description 34
- 210000003128 Head Anatomy 0.000 claims description 24
- 238000005367 electrostatic precipitation Methods 0.000 claims description 14
- 239000004743 Polypropylene Substances 0.000 claims description 12
- -1 polypropylene Polymers 0.000 claims description 12
- 229920001155 polypropylene Polymers 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Abstract
The utility model relates to health protection supplies, and specifically discloses an electrostatic dust collection mask which solves the problem that the protection effect is not good due to the fact that the closeness degree of a mask and a face is not high. The electrostatic dust collection mask comprises a mask body, tying belts and a filtering piece. The mask body comprises an antibacterial breathable cloth layer. The filtering piece is detachably connected to the inner side of the mask body, and comprises a filtering piece jaw part, a filtering piece mouth part and a filtering piece nose part, wherein the three parts are highly matched with the face shape, and the filtering piece is of a multilayer structure and in a laminated shape and at least comprises a melt-blowing cloth layer with superfine electrostatic fibers. The closeness of the mask and the face is high, PM 2.5 and other dust particles in air can be electrostatically adsorbed and effectively filtered, and meanwhile hygiene of the mask is guaranteed and bacteria are prevented from breeding. Furthermore, the electrostatic dust collection mask is characterized in that each tying belt is provided with an adjusting buckle, one tying belt is provided with a hooking and hanging piece, a user can automatically adjust the tightness degree of the tying belts and change belt tying modes according to practical situations, and a high wearing comfort level can be achieved.
Description
Technical field
The utility model relates to healthy prevention articles for use, is specifically related to a kind of electrostatic precipitation mouth mask, can the airborne PM2.5 particle of high efficiency filter etc. harmful substance.
Background technology
PM2.5 refers to that in atmosphere, diameter is less than or equal to the particle of 2.5 microns, also referred to as entering lung particle.Its diameter be less than people hairline thickness 1/20, particle diameter is little, is rich in a large amount of poisonous and harmful substances and the time of staying in atmosphere is long, fed distance is far away, thereby high concentration PM2.5 pollution effect ambient air quality and human body health.There is large-scale persistence haze weather in multiple provinces and cities of China in recent years, makes " PM2.5 " become the focus that people pay close attention to.The mouth mask protecting for this fine particle especially is in the market also few, and on market, the existing mouth mask overwhelming majority uses nonwoven, gauze, plastic net cloth etc. to be prepared from.They knit hole or mesh is all larger, to stop PM2.5 particle to enter effect aspect respiratory tract unsatisfactory.And existing so-called anti-PM2.5 mouth mask on market, mouth mask body major part all cannot be well and the laminating of people face, and the harmful substances such as dust can directly enter respiratory system from the gap between mouth mask and face, if therefore sealing does not all have, what is talked and prevent dust.
According to fluid mechanics principle, where resistance is little, and air-flow will first flow to there.If the contact-making surface of mouth mask and face can coincide well, air just must just can enter human body through filtrate, and so airborne harmful substance will be filtered by filtrate, and the size of dust collection efficiency and resistance is so just directly relevant with filtrate; And when the outer of mouth mask and face loose contact or adaptation are when bad, deleterious particle material will directly enter from loose contact people's respiratory system, and human body is damaged.So no matter how high the dust collection efficiency of filtrate have, and anti-dust respirator does not have protective action yet.
Utility model content
The harmful substances such as for overcoming above-mentioned the deficiencies in the prior art, the utility model provides a kind of electrostatic precipitation mouth mask, very high with people's face shape closed intensity, the airborne PM2.5 particle of energy high efficiency filter.
For realizing above-mentioned technique effect, the technical solution adopted in the utility model is:
A kind of electrostatic precipitation mouth mask, comprise mouth mask body and the frenulum that is arranged on described mouth mask body both sides, on the medial surface of the most close face of described mouth mask body, be also removably connected with filter, described filter comprises the filter chin portion that matches with face chin, the filter oral area matching with face oral area and the filter nose matching with face nose; Described filter is the layered laminate that sandwich construction forms, and at least comprises that one deck is with ultra-fine electrostatic fiber melt-blowing layer of cloth.In the utility model, filter chin portion, filter oral area and the filter nose of filter all can be realized perfect mutual the coincideing of fitting with face corresponding site, and in filter, be at least provided with one deck with ultra-fine electrostatic fiber melt-blowing layer of cloth, the effectively harmful substance such as PM2.5 dust granules thing in absorbed air, ensured the closed intensity of mouth mask and face simultaneously, the respiratory system that prevents from entering the gap of the dust granules such as airborne PM2.5 between mouth mask and face people, damages human body.Further, described filter is four-layer structure, from mouth mask body to face direction be followed successively by polypropylene spunbond nonwoven skin, with ultra-fine electrostatic fiber melt-blowing layer of cloth, activated carbon filter layer and polypropylene spunbond nonwoven internal layer.
Further, angle between described filter chin portion and filter oral area is 140～150 °, angle between described filter nose and filter oral area is 140～150 °, through overtesting, this angle between filter oral area and filter chin portion or filter nose relatively meets most people's face shape, ensure the closed intensity of mouth mask and face, and between face and mouth mask, form a solid space, make to breathe happier.
Further, inside described mouth mask body, two ends are sewed up respectively or the gluing hook face that is provided with, the two ends, outside that contact with mouth mask body of described filter are sewed up respectively or the gluing hair side that is provided with, dismountable linking together between described hair side and hook face, user can or not use or change filter according to environment actual state choice for use.Be all the combined member in magic tape structure at hair side described in the utility model and hook face, on hair side, have the fiber of small, flexible, on hook face, have the seta of harder buckle.
Further, the inside edge contacting with face of described filter nose is provided with an elasticity bonding die, described elasticity bonding die is symmetrically distributed in the filter nose left and right sides, this elasticity bonding die contributes to promote the soft comfort level that mouth mask contacts with face nose, not chafe, improve the closed intensity of mouth mask or filter and face nose simultaneously, prevent that the harmful substances such as PM2.5 particle from entering from the gap of the two.
Further, described mouth mask body is the layered laminate of three-decker formation and sews up in the edge of mouth mask body, described three-decker is followed successively by the ventilative layer of cloth of the antibacterial layer of cloth of gas permeability, insulation filter cotton layer and cotton from outside to inside, make mouth mask can effectively kill the bacterium on mouth mask, prevent that bacterium from growing and affecting mouth mask sanitary condition on mouth mask.After user dismantles filter, mouth mask still can be realized the cold-proof effect of the due resistance dirt of common mouth mask.
Further, the edge contacting with face nose of described mouth mask body is provided with bridge of the nose bar, and described bridge of the nose bar is environmental protection plastic with plasticity, is embedded in described mouth mask body by stitching.Described bridge of the nose bar has plasticity, can suitably make shape adjustments according to user's different nose shapes, promotes nose comfortable wearing degree, also can strengthen the closed intensity of mouth mask and face nose.
Further, described frenulum is provided with adjusting button, described adjusting button comprises pedestal, press head and back-moving spring, described pedestal has along the blind hole of pedestal length direction and along the through hole of base width direction, back-moving spring is placed in pedestal blind hole, described press head is arranged in pedestal blind hole and back-moving spring top, and press head lower end is provided with installing hole.Frenulum, through the through hole on pedestal and the installing hole on press head, unclamps press head, and adjusting button is positioned in certain position of frenulum, then respectively frenulum is hung over after two ears; And user can, according to the face's shape of oneself or individual use habit, regulate the elasticity of frenulum and two ears voluntarily.Control method presses press head, back-moving spring presses down, adjusting button can move freely on the length direction of frenulum, if adjusting complete rear, elasticity need unclamp press head, back-moving spring resets press head is upwards pushed up, block press head through the frenulum after the through hole on pedestal and the installing hole on press head, adjusting button can be re-positioned on frenulum.
Further, described frenulum end is equipped with hanging hole, is also connected with hooking part on the hanging hole of one of them frenulum, and described hooking part two ends are respectively equipped with hook.This technical scheme makes a how selection of wearing mouth mask method of user, be hung in by the hook on hooking part in the hanging hole of frenulum end, then strap loop around the hindbrain that is positioned people, reduce repressive to two ears of mouth mask frenulum, promote the comfort level of wearing.
Described in the utility model, be to be formed by superbhort fiber with ultra-fine electrostatic fiber melt-blowing layer of cloth, superfine fibre diameter is generally 2～4 microns, weight per unit area is 5～60g/m2, fibre web aperture is little and porosity is high, it is high efficiency filter material, after strong Electrostatic Treatment, dust proof rate reaches more than 95%, and good permeability.Prior art is pressed in the described preparation with ultra-fine electrostatic fiber melt-blowing layer of cloth, the preparation of ultra-fine electrostatic fiber melt-blowing layer of cloth:
(1) tourmaline that is 400～600nm by particle diameter is put into super mixer, after pre-thermal agitation 20min, add 3～4% low density polyethylene (LDPE) waxes, the antioxidant of tourmaline weight, then divide 2～5% coupling agent titanate esters that add tourmaline weight for three times, after stirring respectively 20min, take out, 105 DEG C of constant temperature in drying box, dry 2 hours.
(2) tourmaline of handling well through step (1) is added in mixer and mixed about 10 minutes with 1 ︰ 4 ratios with polypropylene chip, again the tourmaline mixing and polypropylene chip are melt extruded at 120～140 DEG C of temperature, cooling through water-bath, cutting granulating, makes modified master batch.
(3) modified master batch making is mixed with polypropylene chip under the condition of 250 ± 1 DEG C by 30% mass percent, taking melt flow index as 1200g/10min, make melt-blowing nonwoven, through corona discharge, melt-blowing nonwoven is carried out to strong Electrostatic Treatment again, after processing, containing tourmaline polypropylene melt-blown superfine fiber nonwovens, fibre web surface charge density obviously increases.
In the technical scheme that the utility model provides with the closely sealed filter of face shape height and filter in ultra-fine electrostatic fiber melt-blowing layer of cloth and activated carbon filter layer, add plasticity bridge of the nose bar and elasticity bonding die that mouth mask contacts with face nose, make the adaptation of mouth mask and face higher, can the airborne PM2.5 particle of high efficiency filter etc. harmful substance; And the antibacterial, ventilating layer of cloth arranging on mouth mask body ensures the good hygiene situation of mouth mask to prevent bacteria breed; And the elasticity bonding die of filter nose, the structural designs such as the hooking part on frenulum and the frenulum of adjustable tightness all can promote the comfort level that mouth mask is worn.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is filter structural front view in the utility model;
Fig. 3 is the filter structure left view shown in Fig. 2;
Fig. 4 is adjusting button structural representation in the utility model;
Fig. 5 is hooking part structural representation in the utility model;
In figure: 1. mouth mask body; 10. hook face; 11. bridge of the nose bars; 2. filter; 20. hair sides; 21. filter chin portions; 22. filter oral areas; 23. filter noses; 230. elasticity bonding dies; 201. polypropylene spunbond nonwoven skins; 202. with ultra-fine electrostatic fiber melt-blowing layer of cloth; 203. activated carbon filter layer; 204. polypropylene spunbond nonwoven internal layers; 3. frenulum; 30. hanging holes; 4. adjusting button; 41. press heads; 410. installing hole; 42. pedestals; 421. blind hole; 422. through hole; 43. back-moving springs; 5. hooking part; 50. hooks.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in detail.
As shown in the figure, the utility model provides a kind of electrostatic precipitation mouth mask, comprise mouth mask body 1 and the frenulum 3 that is arranged on described mouth mask body both sides, on the medial surface of the most close face of described mouth mask body 1, be removably connected with filter 2, the layered laminate that described filter 2 forms for sandwich construction, and at least comprise that one deck is with ultra-fine electrostatic fiber melt-blowing layer of cloth.In the present embodiment, described filter is four-layer structure, from mouth mask body to face direction be followed successively by polypropylene spunbond nonwoven skin 201, with ultra-fine electrostatic fiber melt-blowing layer of cloth 202, activated carbon filter layer 203 and polypropylene spunbond nonwoven internal layer 204.
Described filter 2 comprises the filter chin portion 21 that matches with face chin, the filter oral area 22 matching with face oral area and the filter nose 23 matching with face nose.In the present embodiment, angle between described filter chin portion 21 and filter oral area 22 is 140～150 °, angle between described filter nose 23 and filter oral area 22 is 140～150 °, through overtesting, this angle between filter oral area 22 and filter chin portion 21 or filter nose 23 relatively meets most people's face shape, ensures the closed intensity of mouth mask and face.Filter chin portion 21, filter oral area 22 and the filter nose 23 of filter 2 all can be realized perfect laminating with face corresponding site and mutually coincide, ensure the closed intensity of mouth mask and face, prevented from entering the gaps of harmful substance between mouth mask and face such as airborne PM2.5 particle people's respiratory system.
The inside edge contacting with face of described filter nose 23 is provided with an elasticity bonding die 230, described elasticity bonding die 230 is symmetrically distributed in filter nose 23 left and right sides, this elasticity bonding die 230 contributes to promote the soft comfort level that mouth mask contacts with face nose, not chafe, improve the closed intensity of mouth mask or filter and face nose simultaneously, prevent that the harmful substances such as PM2.5 particle from entering from the gap of the two.
Described mouth mask body 1 two ends, inner side are sewed up respectively or the gluing hook face 10 that is provided with, the two ends, outside that contact with mouth mask body 1 of described filter 2 are sewed up respectively or the gluing hair side 20 that is provided with, dismountable linking together between described hair side 20 and hook face 10, user can or not use or change filter 2 according to environment actual state choice for use.
Described mouth mask body 1 is sewed up for the layered laminate of three-decker formation and in the edge of mouth mask body, described three-decker is followed successively by the ventilative layer of cloth of the antibacterial layer of cloth of gas permeability, insulation filter cotton layer and cotton from outside to inside, give filter and there is anti-microbial property, prevent bacterium from mouth mask, growing and affect mouth mask sanitary condition, make user dismantle filter after mouth mask still can realize the cold-proof effect of the due resistance dirt of common mouth mask.
The edge contacting with face nose of described mouth mask body 1 is provided with bridge of the nose bar 11, and described bridge of the nose bar 11 is environmental protection plastic with plasticity, is embedded in described mouth mask body 1 by stitching.Described bridge of the nose bar 11 has plasticity, can suitably make shape adjustments according to user's different nose shapes, promotes nose comfortable wearing degree, also can strengthen the closed intensity of mouth mask and face nose.
Described frenulum 3 is provided with adjusting button 4, described adjusting button 4 comprises pedestal 42, press head 41 and back-moving spring 43, described pedestal 42 has along the blind hole 421 of pedestal length direction and along the through hole 422 of base width direction, back-moving spring 43 is placed in pedestal blind hole 421, described press head 41 is arranged in pedestal blind hole 421 and back-moving spring 43 tops, and press head 41 lower ends are provided with installing hole 410.Frenulum 3, through the through hole 422 on pedestal and the installing hole 410 on press head, unclamps press head 41, and adjusting button 4 is positioned in certain position of frenulum 3, then respectively frenulum 3 is hung over after two ears; And user can, according to the face's shape of oneself or individual use habit, regulate the elasticity of frenulum and two ears voluntarily.Control method presses press head 41, back-moving spring 43 presses down, adjusting button 4 can move freely on the length direction of frenulum 3, if adjusting complete rear, elasticity need unclamp press head 41, back-moving spring 43 resets press head 41 is upwards pushed up, block press head 41 through the frenulum 3 after the through hole 422 on pedestal and the installing hole 410 on press head 41, adjusting button 4 can be re-positioned on frenulum 3.
In the present embodiment, described frenulum 3 ends are equipped with hanging hole 30, on the hanging hole 30 of one of them frenulum, are also connected with hooking part 5, and described hooking part 5 two ends are respectively equipped with hook 50.A how selection of wearing mouth mask method of user, is hung in by the hook 50 on hooking part 5 in the hanging hole 30 of frenulum end, then frenulum 3 around the hindbrain that is positioned people, reduce repressive to two ears of mouth mask frenulum, promote the comfort level of wearing.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, within all falling into protection domain of the present utility model.
Claims (9)
1. an electrostatic precipitation mouth mask, comprise mouth mask body (1) and be arranged on the frenulum (3) of described mouth mask body both sides, it is characterized in that, on the medial surface of the most close face of described mouth mask body (1), be also removably connected with filter (2), described filter (2) comprises the filter chin portion (21) that matches with face chin, the filter oral area (22) matching with face oral area and the filter nose (23) matching with face nose; The layered laminate that described filter (2) forms for sandwich construction, and at least comprise that one deck is with ultra-fine electrostatic fiber melt-blowing layer of cloth (202).
2. a kind of electrostatic precipitation mouth mask according to claim 1, it is characterized in that, described filter is four-layer structure, from mouth mask body to face direction be followed successively by polypropylene spunbond nonwoven skin (201), with ultra-fine electrostatic fiber melt-blowing layer of cloth (202), activated carbon filter layer (203) and polypropylene spunbond nonwoven internal layer (204).
3. a kind of electrostatic precipitation mouth mask according to claim 1 and 2, it is characterized in that, angle between described filter chin portion (21) and filter oral area (22) is 140～150 °, and the angle between described filter nose (23) and filter oral area (22) is 140～150 °.
4. a kind of electrostatic precipitation mouth mask according to claim 1 and 2, it is characterized in that, two ends, described mouth mask body (1) inner side are sewed up respectively or the gluing hook face (10) that is provided with, the two ends, outside that contact with mouth mask body of described filter (2) are sewed up respectively or the gluing hair side (20) that is provided with, dismountable linking together between the hook face (10) on hair side (20) and mouth mask body on described filter.
5. a kind of electrostatic precipitation mouth mask according to claim 1 and 2, it is characterized in that, the inside edge contacting with face of described filter nose (23) is provided with an elasticity bonding die (230), and described elasticity bonding die (230) is symmetrically distributed in filter nose (23) left and right sides.
6. a kind of electrostatic precipitation mouth mask according to claim 1 and 2, it is characterized in that, described mouth mask body (1) is sewed up for the layered laminate of three-decker formation and in the edge of mouth mask body, and described three-decker is followed successively by the ventilative layer of cloth of the antibacterial layer of cloth of gas permeability, insulation filter cotton layer and cotton from outside to inside.
7. a kind of electrostatic precipitation mouth mask according to claim 1 and 2, it is characterized in that, the edge contacting with face nose of described mouth mask body (1) is provided with bridge of the nose bar (11), described bridge of the nose bar is environmental protection plastic with plasticity, and described bridge of the nose bar (11) is embedded in described mouth mask body (1) by stitching.
8. a kind of electrostatic precipitation mouth mask according to claim 1 and 2, it is characterized in that, described frenulum (3) is provided with adjusting button (4), described adjusting button (4) comprises pedestal (42), press head (41) and back-moving spring (43), described pedestal (42) has along the blind hole (421) of pedestal length direction and along the through hole (422) of base width direction, back-moving spring (43) is placed in pedestal blind hole (421), described press head (41) is arranged in pedestal blind hole (421) and back-moving spring (43) top, press head (41) lower end is provided with installing hole (410).
9. a kind of electrostatic precipitation mouth mask according to claim 8, it is characterized in that, described frenulum (3) end is equipped with hanging hole (30), wherein on the hanging hole of a frenulum (30), is also connected with hooking part (5), and described hooking part (5) two ends are respectively equipped with hook (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122120.4U CN203748715U (en) | 2014-03-18 | 2014-03-18 | Electrostatic dust collection mask |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122120.4U CN203748715U (en) | 2014-03-18 | 2014-03-18 | Electrostatic dust collection mask |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203748715U true CN203748715U (en) | 2014-08-06 |
Family
ID=51244025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420122120.4U Expired - Fee Related CN203748715U (en) | 2014-03-18 | 2014-03-18 | Electrostatic dust collection mask |
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| CN (1) | CN203748715U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104489969A (en) * | 2014-11-25 | 2015-04-08 | 苏州维度丝绸有限公司 | Silk mask |
| CN105231523A (en) * | 2015-10-08 | 2016-01-13 | 天津理工大学 | Efficient protecting mask taking triboelectric nano power generator as filtering layer |
| CN105268327A (en) * | 2015-03-17 | 2016-01-27 | 青岛瑞利特新材料科技有限公司 | Graphene anti-PM2.5 mouth mask filter sheet functional layer and applications in filter sheet |
| CN105533854A (en) * | 2015-11-16 | 2016-05-04 | 韩文贤 | Police facial mask with replaceable air filters |
| CN106820343A (en) * | 2016-11-04 | 2017-06-13 | 广东乐惠购网络科技有限公司 | A kind of Electrostatic Absorption haze mouth mask |
| CN106930003A (en) * | 2017-05-11 | 2017-07-07 | 吉林省华纺静电材料科技有限公司 | A kind of electrostatic fibre Through-Air Thermal Bonded Nonwovens screen pack and its preparation method and application |
| CN111134400A (en) * | 2020-04-02 | 2020-05-12 | 上海护理佳实业有限公司 | Disposable mask pad |
| WO2021223691A1 (en) * | 2020-05-04 | 2021-11-11 | 深圳市那尼科技有限公司 | Novel filter sheet |
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2014
- 2014-03-18 CN CN201420122120.4U patent/CN203748715U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104489969A (en) * | 2014-11-25 | 2015-04-08 | 苏州维度丝绸有限公司 | Silk mask |
| CN105268327A (en) * | 2015-03-17 | 2016-01-27 | 青岛瑞利特新材料科技有限公司 | Graphene anti-PM2.5 mouth mask filter sheet functional layer and applications in filter sheet |
| CN105231523A (en) * | 2015-10-08 | 2016-01-13 | 天津理工大学 | Efficient protecting mask taking triboelectric nano power generator as filtering layer |
| CN105533854A (en) * | 2015-11-16 | 2016-05-04 | 韩文贤 | Police facial mask with replaceable air filters |
| CN106820343A (en) * | 2016-11-04 | 2017-06-13 | 广东乐惠购网络科技有限公司 | A kind of Electrostatic Absorption haze mouth mask |
| CN106930003A (en) * | 2017-05-11 | 2017-07-07 | 吉林省华纺静电材料科技有限公司 | A kind of electrostatic fibre Through-Air Thermal Bonded Nonwovens screen pack and its preparation method and application |
| CN106930003B (en) * | 2017-05-11 | 2019-03-19 | 吉林省华纺静电材料科技有限公司 | A kind of electrostatic fibre Through-Air Thermal Bonded Nonwovens filter screen and its preparation method and application |
| CN111134400A (en) * | 2020-04-02 | 2020-05-12 | 上海护理佳实业有限公司 | Disposable mask pad |
| WO2021223691A1 (en) * | 2020-05-04 | 2021-11-11 | 深圳市那尼科技有限公司 | Novel filter sheet |
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