CN109550315A - A kind of fire resistant prickling filtering felt - Google Patents

A kind of fire resistant prickling filtering felt Download PDF

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Publication number
CN109550315A
CN109550315A CN201811497843.1A CN201811497843A CN109550315A CN 109550315 A CN109550315 A CN 109550315A CN 201811497843 A CN201811497843 A CN 201811497843A CN 109550315 A CN109550315 A CN 109550315A
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CN
China
Prior art keywords
layer
ptfe
fiber
parts
fire resistant
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.)
Pending
Application number
CN201811497843.1A
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Chinese (zh)
Inventor
宋奇
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.)
Jiangsu Michimori Bag Co Ltd
Original Assignee
Jiangsu Michimori Bag Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jiangsu Michimori Bag Co Ltd filed Critical Jiangsu Michimori Bag Co Ltd
Priority to CN201811497843.1A priority Critical patent/CN109550315A/en
Publication of CN109550315A publication Critical patent/CN109550315A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/067—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered 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
    • B32B5/02—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered 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
    • B32B5/22—Layered 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
    • B32B5/24—Layered 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
    • B32B5/26—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/546—Flexural strength; Flexion stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/744—Non-slip, anti-slip

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention proposes a kind of fire resistant prickling filtering felts, including base, and filter layer, the bottom of base's upper and lower surface is arranged in, and the surface layer of filtering layer surface is arranged in；The surface layer is high-temperature-resistant layer, and the filter layer is PTFE fiber and PPS fiber composite fibrous layer, and the bottom is glass fibre and PTFE fiber composite fibre layer, and the base is superfine fibre and PTFE fiber composite fibre layer.The present invention have good chemical property, good filter efficiency, good deashing property and longer service life, excellent performance be other filtering materials it is incomparable；Fibrous layer internal structure is in zigzag path, and pore-size is small, and voidage is high, resistance is small, permeability is good, and efficiency of dust collection is more than ordinary filter.

Description

A kind of fire resistant prickling filtering felt
Technical field
The present invention relates to filter felt technical fields, and in particular to a kind of fire resistant prickling filtering felt.
Background technique
High temperature resistant Nomex filtering material mainly has synthetic fibers, such as aramid fiber, Kermel fiber, PPS (such as glass, ceramics are fine for (Polyphenylene sulfide, polyphenylene sulfide) fiber, polyimide P 84 fiber, inorfil Dimension, carbon fiber) and metallic fiber etc..But since more stringent requirements are proposed to fire resistant filter material performance for application market, such as Waste incinerator high temperature, water content are big, dew point is high, chemical corrosivity is strong, the gas cleaning of high viscosity dust, often occur high Bag is pasted below wet, dew point and containing sour gas such as HCL and HF, acid dew point is high, and corrosivity waits by force corrosion cloth bag；Burning high sulfur coal Boiler of power plant with acid-base property, aggressive chemistry gas industrial fumes purification, often there are the chemical gas such as high temperature sulfur-bearing Corrode cloth bag；The city heat and power supply boiler of frequent start-stop will appear low temperature moisture condensation, generate clear caused by high temperature, high viscosity dust Grey difficult, the dew point oxidation reaction after blowing out makes filtrate early stage embrittlement；The coal-fired exhaust gas temperature with combustion gas multi-fuel fired boiler is up to 200 DEG C -260 DEG C, flue gas is strong to the chemical action of filtrate, it may appear that high temperature burning bag, high viscosity dust paste bag, chemical atmospheres corrosion The problems such as cloth bag require filtrate and are resistant to extensive chemical corrosivity, high temperature resistant, hydrolysis, characteristics such as easy-to-clean ash, and used at present Aramid fiber (such as Nomex, Conex, domestic aramid fiber), the Kennel fiber of France, PPS fiber, Austrian polyimide P 84 fiber Equal filtering materials, not can solve the short problem of the filtrate service life of bad working environments.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of fire resistant prickling filtering felt, passes through the resistance to height on surface layer Warm layer, so that Nomex of the present invention has good high temperature resistance, chemical property, good filter efficiency, good deashing Performance and longer service life.
The present invention provides a kind of fire resistant prickling filtering felt, including base, and filter layer, the bottom of base's upper and lower surface is arranged in Layer, and the surface layer of filtering layer surface is set；The surface layer is high-temperature-resistant layer, and the filter layer is that PTFE fiber and PPS are fine Composite fibre layer is tieed up, the bottom is glass fibre and PTFE fiber composite fibre layer, and the base is superfine fibre and PTFE Fiber composite fibrous layer.
As further improvement of the invention, the high-temperature-resistant layer surface adhesion has PTFE coating layer.
As further improvement of the invention, the high-temperature-resistant layer is prepared from the following materials: glass fibre 35-45 Part, 25-35 parts of polyimide fiber, 25-35 parts of conductive fiber, 13-25 parts of basalt fibre, 13-23 parts of polytetrafluoroethylene (PTFE).
As further improvement of the invention, the high-temperature-resistant layer is prepared from the following materials: 40 parts of glass fibre gathers 30 parts of imide fiber, 30 parts of conductive fiber, 20 parts of basalt fibre, 15 parts of polytetrafluoroethylene (PTFE).
As further improvement of the invention, the filter layer is using the PTFE fiber for adding antistatic agent.
It is improved as of the invention further, it for 15-20um, length is 50-70mm's that the filter layer, which uses diameter, PTFE fiber.
As further improvement of the invention, the bottom uses the PTFE that diameter is 50-70mm for 20-25um, length Fiber.
As further improvement of the invention, the base uses the PTFE that diameter is 50-70mm for 15-25um, length Fiber.
The invention has the following beneficial effects: compared with prior art, advantages of the present invention: the present invention has goodization Learning performance, good filter efficiency, good deashing property and longer service life, excellent performance is other filter materials Expect incomparable；Fibrous layer internal structure is in zigzag path, and pore-size is small, and voidage is high, resistance is small, permeability Good, efficiency of dust collection is more than ordinary filter；The property such as entirety has fine resistance to acid and alkali, corrosion-resistant, high temperature resistant, antifriction scrape along is warping strength Can, suitable for high temperature, high humidity, high viscosity dust industry or with acid-base property, aggressive chemistry gas industrial fumes purification.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the invention is clearly and completely described, Obviously, the embodiment described is the embodiment of part of representative of the invention, rather than whole embodiments, this field are general Other all embodiments obtained belong to protection of the invention to logical technical staff without making creative work Range.
Embodiment 1: fire resistant prickling filtering felt as shown in Figure 1, including base 4, filter layer 3, bottom 5, surface layer 2, PTFE coating layer 1；In 4 upper and lower surface of base, surface layer 2 is arranged in 3 surface of filter layer for filter layer 3, the setting of bottom 5, adheres on surface layer 2 There is PTFE coating layer 1；Surface layer 2 is high-temperature-resistant layer, and filter layer 3 is PTFE fiber and PPS fiber composite fibrous layer, and bottom 5 is glass Glass fiber and PTFE fiber composite fibre layer, base are superfine fibre and PTFE fiber composite fibre layer；Filter layer 3 uses diameter It is 50mm for 15um, length and adds the PTFE fiber of antistatic agent；It for 20um, length is 50mm's that bottom 5, which uses diameter, PTFE fiber；The PTFE fiber that base is adopted as 15um, length is 50mm.The aperture of PTFE coating layer 1 is 1-3um.
The high-temperature-resistant layer is prepared from the following materials: 35 parts of glass fibre, 25 parts of polyimide fiber, conductive fiber 25 parts, 13 parts of basalt fibre, 13 parts of polytetrafluoroethylene (PTFE).
Embodiment 2: fire resistant prickling filtering felt as shown in Figure 1, including base 4, filter layer 3, bottom 5, surface layer 2, PTFE coating layer 1；In 4 upper and lower surface of base, surface layer 2 is arranged in 3 surface of filter layer for filter layer 3, the setting of bottom 5, adheres on surface layer 2 There is PTFE coating layer 1；Surface layer 2 is high-temperature-resistant layer, and filter layer 3 is PTFE fiber and PPS fiber composite fibrous layer, and bottom 5 is glass Glass fiber and PTFE fiber composite fibre layer, base are superfine fibre and PTFE fiber composite fibre layer；Filter layer 3 uses diameter It is 70mm for 20um, length and adds the PTFE fiber of antistatic agent；It for 25um, length is 70mm's that bottom 5, which uses diameter, PTFE fiber；The PTFE fiber that base is adopted as 25um, length is 70mm.The aperture of PTFE coating layer 1 is 1-3um.
The high-temperature-resistant layer is prepared from the following materials: 45 parts of glass fibre, 35 parts of polyimide fiber, conductive fiber 35 parts, 25 parts of basalt fibre, 23 parts of polytetrafluoroethylene (PTFE).
Embodiment 3: fire resistant prickling filtering felt as shown in Figure 1, including base 4, filter layer 3, bottom 5, surface layer 2, PTFE coating layer 1；In 4 upper and lower surface of base, surface layer 2 is arranged in 3 surface of filter layer for filter layer 3, the setting of bottom 5, adheres on surface layer 2 There is PTFE coating layer 1；Surface layer 2 is high-temperature-resistant layer, and filter layer 3 is PTFE fiber and PPS fiber composite fibrous layer, and bottom 5 is glass Glass fiber and PTFE fiber composite fibre layer, base are superfine fibre and PTFE fiber composite fibre layer；Filter layer 3 uses diameter It is 60mm for 18um, length and adds the PTFE fiber of antistatic agent；It for 21um, length is 55mm's that bottom 5, which uses diameter, PTFE fiber；The PTFE fiber that base is adopted as 24um, length is 65mm.The aperture of PTFE coating layer 1 is 1-3um.
The high-temperature-resistant layer is prepared from the following materials: 40 parts of glass fibre, 30 parts of polyimide fiber, conductive fiber 30 parts, 20 parts of basalt fibre, 15 parts of polytetrafluoroethylene (PTFE).
Those skilled in the art is not under conditions of departing from the spirit and scope of the present invention that claims determine, also Various modifications can be carried out to the above content.Therefore the scope of the present invention is not limited in above explanation, but by The range of claims determines.

Claims (8)

1. a kind of fire resistant prickling filtering felt, it is characterised in that: including base, filter layer, the bottom of base's upper and lower surface is arranged in Layer, and the surface layer of filtering layer surface is set；The surface layer is high-temperature-resistant layer, and the filter layer is that PTFE fiber and PPS are fine Composite fibre layer is tieed up, the bottom is glass fibre and PTFE fiber composite fibre layer, and the base is superfine fibre and PTFE Fiber composite fibrous layer.
2. fire resistant prickling filtering felt according to claim 1, it is characterised in that: the high-temperature-resistant layer surface adhesion has PTFE coating layer.
3. fire resistant prickling filtering felt according to claim 1 or 2, it is characterised in that: the high-temperature-resistant layer is by following original Material is prepared: 35-45 parts of glass fibre, 25-35 parts of polyimide fiber, 25-35 parts of conductive fiber, basalt fibre 13- 25 parts, 13-23 parts of polytetrafluoroethylene (PTFE).
4. fire resistant prickling filtering felt according to claim 3, it is characterised in that: the high-temperature-resistant layer is by following raw material system It is standby to form: 40 parts of glass fibre, 30 parts of polyimide fiber, 30 parts of conductive fiber, 20 parts of basalt fibre, polytetrafluoroethylene (PTFE) 15 Part.
5. fire resistant prickling filtering felt according to claim 1, it is characterised in that: the filter layer is antistatic using adding The PTFE fiber of agent.
6. fire resistant prickling filtering felt according to claim 1, it is characterised in that: the filter layer uses diameter for 15- 20um, the PTFE fiber that length is 50-70mm.
7. fire resistant prickling filtering felt according to claim 1, it is characterised in that: the bottom uses diameter for 20- 25um, the PTFE fiber that length is 50-70mm.
8. fire resistant prickling filtering felt according to claim 1, it is characterised in that: the base uses diameter for 15- 25um, the PTFE fiber that length is 50-70mm.
CN201811497843.1A 2018-12-07 2018-12-07 A kind of fire resistant prickling filtering felt Pending CN109550315A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811497843.1A CN109550315A (en) 2018-12-07 2018-12-07 A kind of fire resistant prickling filtering felt

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Application Number Priority Date Filing Date Title
CN201811497843.1A CN109550315A (en) 2018-12-07 2018-12-07 A kind of fire resistant prickling filtering felt

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111111339A (en) * 2020-02-01 2020-05-08 盐城工业职业技术学院 High temperature resistant acupuncture filter felt with PTFE coating
CN111493395A (en) * 2020-03-27 2020-08-07 中国纺织科学研究院有限公司 Mask and preparation method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141899A1 (en) * 2008-05-21 2009-11-26 株式会社フジコー Felt material for air filter
CN105233585A (en) * 2015-10-13 2016-01-13 江苏新业重工股份有限公司 High-temperature resistant needled felt dust collection cloth bag
CN205252711U (en) * 2015-12-11 2016-05-25 江苏富旺滤料有限公司 High temperature resistant needled filter felt
CN107983035A (en) * 2017-12-27 2018-05-04 广西金邦泰科技有限公司 A kind of high-temperature-resistant antistatic Nomex dust collecting sleeve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009141899A1 (en) * 2008-05-21 2009-11-26 株式会社フジコー Felt material for air filter
CN105233585A (en) * 2015-10-13 2016-01-13 江苏新业重工股份有限公司 High-temperature resistant needled felt dust collection cloth bag
CN205252711U (en) * 2015-12-11 2016-05-25 江苏富旺滤料有限公司 High temperature resistant needled filter felt
CN107983035A (en) * 2017-12-27 2018-05-04 广西金邦泰科技有限公司 A kind of high-temperature-resistant antistatic Nomex dust collecting sleeve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111111339A (en) * 2020-02-01 2020-05-08 盐城工业职业技术学院 High temperature resistant acupuncture filter felt with PTFE coating
CN111493395A (en) * 2020-03-27 2020-08-07 中国纺织科学研究院有限公司 Mask and preparation method thereof

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