CN112791537A - Filter device and mask of PTFE (polytetrafluoroethylene) biaxial tension membrane with bimodal distribution fiber diameters - Google Patents

Filter device and mask of PTFE (polytetrafluoroethylene) biaxial tension membrane with bimodal distribution fiber diameters Download PDF

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Publication number
CN112791537A
CN112791537A CN202011467294.0A CN202011467294A CN112791537A CN 112791537 A CN112791537 A CN 112791537A CN 202011467294 A CN202011467294 A CN 202011467294A CN 112791537 A CN112791537 A CN 112791537A
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China
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ptfe
diameter
peak
bimodal distribution
layer
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CN202011467294.0A
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Inventor
鲁明
常欢
李成
丁超
陈平绪
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Guangdong Kingfa Science and Technology Co Ltd
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Guangdong Kingfa Science and Technology Co Ltd
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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
    • B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
    • B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/02—Layered materials
    • 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
    • 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
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series

Abstract

The invention provides a filtering device and a mask of a PTFE biaxial stretching film with a bimodal distribution fiber diameter, wherein the filtering device comprises: the diameter distribution of each fiber in the PTFE biaxial stretching film statistically has a bimodal distribution form; the supporting layer is arranged on at least one side of the PTFE biaxial stretching film and forms more than two layers of filtering structures with the PTFE biaxial stretching film; the bimodal distribution morphology includes: a first peak having a diameter in the range: 1-4 μm; a second peak having a diameter in the range: 10 to 20 μm. According to the invention, the PTFE biaxial tension film with the bimodal distribution fiber diameter and the supporting layer are laminated, so that the optimal effects of obstruction and breathing smoothness are realized, and a new technical trend is provided for the prior art.

Description

Filter device and mask of PTFE (polytetrafluoroethylene) biaxial tension membrane with bimodal distribution fiber diameters
Technical Field
The invention belongs to the field of respiratory protection, and particularly relates to a filtering device and a mask of a PTFE (polytetrafluoroethylene) biaxial stretching film with bimodal distribution fiber diameters.
Background
The filter layer of current gauze mask is mostly the melt-blown fabric, and in order to realize higher separation nature, adopt the density that improves filter layer melt-blown fabric usually, reduce the melt-blown fabric aperture, reduce the way of melt-blown fabric porosity, but do so and reduce the gas permeability of gauze mask, cause the sense of oppression when wearing, greatly influence use comfort.
To sum up, the research and development direction of the prior art only reduces the hole diameter of the melt-blown fabric continuously, and on the premise of improving the filtering effect, the airflow resistance cannot be considered, and a new technical trend needs to be provided for the existing products.
Disclosure of Invention
The invention aims to provide a filtering device and a mask of a PTFE (polytetrafluoroethylene) biaxial stretching film with a bimodal distribution fiber diameter, which can get rid of the existing technical trend of continuously reducing the pore diameter of a melt-blown fabric, provide a filtering device and a mask of the PTFE biaxial stretching film with the bimodal distribution fiber diameter, and provide a new technical trend for the existing products.
To achieve the above object, the present invention provides a filtration device of a PTFE biaxially oriented film having a bimodal distribution of fiber diameters, comprising:
the PTFE biaxial stretching film is characterized in that the diameter distribution of each fiber in the PTFE biaxial stretching film statistically has a bimodal distribution morphology;
the supporting layer is arranged on at least one side of the PTFE biaxial stretching film and forms a filtering structure with the PTFE biaxial stretching film, wherein the filtering structure comprises more than two layers;
the bimodal distribution morphology comprises:
a first peak having a diameter in a range of: 1-4 μm;
a second peak having a diameter in a range of: 10 to 20 μm.
In a specific embodiment, the ratio of fibers having a diameter within the first peak is: 70% -90%, the fiber with the diameter in the second peak range accounts for the ratio: 10 to 30 percent.
In a particular embodiment, the maximum diameter of the range of diameters of the first peaks is smaller than or equal to the fiber diameter of the support layer.
In a specific embodiment, the peak value of the first peak is: 2.5 μm;
the peak value of the second peak is: 14 μm.
In a specific embodiment, the support layer is disposed on one side of the PTFE biaxially oriented film or the support layer is disposed on both sides of the PTFE biaxially oriented film.
In a specific embodiment, the support layer is one or both of a non-woven fabric and a melt-blown fabric.
In a specific embodiment, the support layer has a fiber diameter of: 4-50 μm.
A mask having a PTFE biaxially oriented film with a bimodal distribution of fiber diameters, comprising:
the mask body comprises an inner layer and an outer layer, wherein the inner layer is used for fitting the face of a user;
the filter device of the previous embodiment disposed between the inner layer and the outer layer.
In a particular embodiment, the inner layer comprises a nonwoven fabric;
and/or, the outer layer comprises a nonwoven fabric.
In a particular embodiment, further comprises a belt body:
the belt body is used for keeping the mask main body on the face of a user.
The invention has at least the following beneficial effects:
the filtration device of the PTFE biaxially oriented film having a bimodal distribution of fiber diameters of the present invention comprises: the diameter distribution of each fiber in the PTFE biaxial stretching film statistically has a bimodal distribution form; the supporting layer is arranged on at least one side of the PTFE biaxial stretching film and forms more than two layers of filtering structures with the PTFE biaxial stretching film; the bimodal distribution morphology includes: a first peak having a diameter in the range: 1-4 μm; a second peak having a diameter in the range: 10 to 20 μm. On one hand, the PTFE biaxial stretching film and the supporting layer are laminated, so that the PTFE biaxial stretching film has a filtering effect and also has good air permeability. On the other hand, the PTFE biaxial stretching film with the diameter of the fibers distributed in a double-peak manner is utilized, so that the diameter of the fibers is mainly concentrated in the range of two wave peaks, the diameter of the fibers in the range of the first wave peak is smaller, the better physical blocking effect is achieved, the diameter of the fibers in the range of the second wave peak is larger, the larger diameter of the fibers can increase the size of pores among the fibers, the integral bulkiness of the PTFE biaxial stretching is improved, and the respiratory resistance is reduced. Therefore, the effect of optimal obstruction and breathing smoothness is realized, and a new technical trend is provided for the prior art.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic illustration of a bimodal distribution in a support layer of an embodiment of the present invention.
Fig. 2 is a laminated view of a support layer and a PTFE biaxially oriented film of an example of the invention.
FIG. 3 is an electron micrograph of a combination of a support layer and a PTFE biaxially oriented film of an embodiment of the present invention.
FIG. 4 is a layer diagram of a second embodiment of the present invention.
Fig. 5 is a schematic view of a mask according to a second embodiment of the present invention.
In the figure: 1-mask body, 12-inner layer, 11-outer layer, 2-filtering device, 21-supporting layer, 22-PTFE biaxial stretching film and 3-belt body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1-5 of the specification, a filter apparatus 2 of PTFE biaxially oriented film 22 having a bimodal distribution of fiber diameters comprises:
the diameter distribution of each fiber in the PTFE biaxial stretching film statistically has a bimodal distribution form;
the support layer 21 is arranged on at least one side of the PTFE biaxial stretching film 22, and forms a filtering structure with the PTFE biaxial stretching film 22 by more than two layers;
the bimodal distribution morphology includes:
a first peak having a diameter in the range: 1-4 μm;
a second peak having a diameter in the range: 10 to 20 μm.
The following detailed description of specific implementations of the present invention is provided in conjunction with specific embodiments:
comprises a PTFE biaxial stretching film 22 and a supporting layer 21; the PTFE biaxially oriented film 22 has a bimodal pore size distribution as shown in fig. 1.
As shown in fig. 2, which is a preferred embodiment, a support layer 21 is provided on one side of the PTFE biaxially stretched film 22 to support the PTFE biaxially stretched film 22. When the support layer 21 is a single layer, the support layer 21 and the PTFE biaxially oriented film 22 form a two-layer filter structure, and when the support layer 21 is a plurality of layers, the support layer 21 and the PTFE biaxially oriented film 22 form a multi-layer filter structure. In another embodiment, the support layer 21 may also be disposed on both sides of the PTFE biaxially oriented film 22.
The support layer 21 may be a meltblown nonwoven layer.
On the other hand, in the present embodiment, the PTFE biaxially oriented film 22 and the support layer 21 are laminated to each other, thereby providing a good air permeability in addition to a filtering function. On the other hand, the PTFE biaxially oriented film 22 with the bimodal distribution fiber diameter is utilized in the embodiment, so that the diameter of the fibers is mainly concentrated in two peak ranges, the fiber diameter in the first peak range is smaller, a better physical blocking effect is achieved, the fiber diameter in the second peak range is larger, the pore size between the fibers can be increased by the larger fiber diameter, the overall bulkiness of the PTFE biaxially oriented film 22 is improved, and the respiratory resistance is reduced. Therefore, the effect of optimal obstruction and breathing smoothness is realized, and a new technical trend is provided for the prior art.
In a preferred embodiment, the ratio of fibers having a diameter in the first peak range is: 70% -90%, the fiber with the diameter in the second peak range accounts for the ratio: 10 to 30 percent. Thus, in the bimodal distribution, the fibers in the first peak range occupy a major portion of the PTFE biaxially oriented film 22, resulting in better overall filtration performance of the filtration device 2.
In a preferred embodiment, the first peaks have a maximum diameter in the range of diameters that is less than or equal to the diameter of the fibers of the support layer 21. Thus, the PTFE biaxially oriented film 22 mainly serves as a barrier, and the support layer 21 mainly serves as a structural support, thereby achieving a balance between the filtration performance and the structural stability of the filtration device 2.
In a preferred embodiment, the peak of the first peak is: 2.5 μm, the peak of the second peak is: 14 μm.
In testing the product, the following settings were made for the embodiment and the comparative scheme:
the first embodiment is as follows:
the filtration device comprises a PTFE biaxially oriented film in which the diameter distribution of the individual fibers statistically has a bimodal distribution morphology, and a support layer 21. The support layer 21 is disposed on one side of the PTFE biaxially oriented film 22 to form a two-layer filter structure with the PTFE biaxially oriented film 22. The bimodal distribution morphology includes: a first peak having a diameter in the range: 1-4 μm; a second peak having a diameter in the range: 10 to 20 μm. The peak value of the first peak is: 2.5 μm, the peak of the second peak is: 14 μm. The fiber ratio of the diameter in the first peak range is as follows: 83%, and the ratio of the fibers with the diameter in the second peak range is: 17 percent. The support layer is a melt-blown nonwoven fabric layer, and the average diameter of each fiber in the melt-blown nonwoven fabric layer is 4 μm.
The first comparison scheme is as follows:
the filtering device comprises a PTFE (polytetrafluoroethylene) biaxial stretching film and a supporting layer 21, the diameter distribution of each fiber in the PTFE biaxial stretching film is statistically random, and the diameter range of each fiber in the PTFE biaxial stretching film 22 is as follows: 0.5 to 20 μm. The support layer 21 is arranged on one side of the PTFE biaxial stretching film 22 and forms a two-layer filtering structure with the PTFE biaxial stretching film 22, the support layer is a melt-blown non-woven fabric layer, and the average diameter of each fiber in the melt-blown non-woven fabric layer is 4 mu m.
Comparative scheme two:
the filtration device comprises a double-layer melt-blown nonwoven layer, wherein the average diameter of each fiber in the melt-blown nonwoven layer is 4 μm.
Further, the above embodiment one, comparative scheme one and comparative scheme two were tested separately: the filtration efficiency and the filtration resistance of the salt aerosol are tested. The test results are shown in table I:
Figure BDA0002834820400000061
Figure BDA0002834820400000071
analyzing a specific principle: in one embodiment, for example, the ratio of fibers in the first peak range in the PTFE biaxially oriented film 22: 83%, fiber ratio in the second peak range: 17 percent. When the first peak occupies 83%, the main body of the whole PTFE biaxially oriented film 22 is constituted, so that the PTFE biaxially oriented film 22 has a better filtration effect. Meanwhile, by controlling the fiber diameter range of the first wave crest in the PTFE biaxially oriented film 22 to be smaller than or equal to that of the support layer 21, the air permeability of the PTFE biaxially oriented film can be always higher than that of the support layer 21, and the filtering effect of the support layer 21 is not affected; therefore, the physical barrier and filtration of the mask are compatible with the electret effect of the support layer 21, and the optimal barrier and breathing smoothness effect is realized.
In the first comparative example, the diameter distribution of each fiber in the PTFE biaxially oriented film was statistically random, and the filtration effect was decreased and the respiratory resistance was decreased compared to the bimodal distribution in the first example.
In the second comparison scheme, a double-layer melt-blown non-woven fabric layer is adopted for filtering, and the filtering effect is weaker than that of the first embodiment scheme and the first comparison scheme.
Example 2
Referring to fig. 1-5 of the specification, a mask having a PTFE biaxially oriented film with a bimodal distribution of fiber diameters, comprising:
the mask body 1 comprises an inner layer 12 and an outer layer 11, wherein the inner layer 12 is used for fitting the face of a user;
a filter device 2 as described in example 1, is disposed between the inner layer 12 and the outer layer 11.
Wherein the inner layer 12 comprises a non-woven fabric and the outer layer 11 comprises a non-woven fabric.
Wherein, the mask further comprises a belt body 3 for holding the mask body 1 on the face of the user. Preferably, the belt body 3 comprises an ear-hanging type, a binding belt type or a loop type; the mask body 1 may be flat or three-dimensional as required.
In testing the product, the following settings were made for the embodiment and the comparative scheme:
embodiment two:
the inner layer 12 comprises non-woven fabrics, the outer layer 11 comprises non-woven fabrics, and the mask is sequentially provided with the outer layer 11, a supporting layer 21, a PTFE (polytetrafluoroethylene) biaxial stretching film 22 and the inner layer 12 from outside to inside. The diameter distribution of each fiber in the PTFE biaxial stretching film statistically has a bimodal distribution morphology, and the bimodal distribution morphology comprises: a first peak having a diameter in the range: 1-4 μm; a second peak having a diameter in the range: 10 to 20 μm. The peak value of the first peak is: 2.5 μm, the peak of the second peak is: 14 μm. The fiber ratio of the diameter in the first peak range is as follows: 83%, and the ratio of the fibers with the diameter in the second peak range is: 17 percent. The support layer is a melt-blown nonwoven fabric layer, and the average diameter of each fiber in the melt-blown nonwoven fabric layer is 4 μm.
A third comparison scheme:
the inner layer 12 comprises non-woven fabrics, the outer layer 11 comprises non-woven fabrics, and the mask is sequentially provided with the outer layer 11, a supporting layer 21, a PTFE (polytetrafluoroethylene) biaxial stretching film 22 and the inner layer 12 from outside to inside. The diameter distribution of each fiber in the PTFE biaxially oriented film is statistically random, and the diameter range of each fiber in the PTFE biaxially oriented film 22 is: 0.5 to 20 μm. The support layer 21 is arranged on one side of the PTFE biaxial stretching film 22 and forms a two-layer filtering structure with the PTFE biaxial stretching film 22, the support layer is a melt-blown non-woven fabric layer, and the average diameter of each fiber in the melt-blown non-woven fabric layer is 4 mu m.
The fourth comparative scheme is as follows:
the inner layer 12 comprises non-woven fabrics, the outer layer 11 comprises non-woven fabrics, the mask is composed of the outer layer 11, a double-layer melt-blown non-woven fabric layer and the inner layer 12 from outside to inside in sequence, and the average diameter of each fiber in the melt-blown non-woven fabric layer is 4 micrometers.
Further, the above embodiment two, the comparison scheme three and the comparison scheme four were tested separately: the filtration efficiency and the filtration resistance of the salt aerosol are tested. The test results are shown in table II:
Figure BDA0002834820400000091
analyzing a specific principle: in embodiment two, for example, the fiber ratio in the first peak range in the PTFE biaxially oriented film 22: 83%, fiber ratio in the second peak range: 17 percent. When the first peak occupies 83%, the main body of the whole PTFE biaxial stretching film 22 is formed, so that the filtering effect of the mask is better. Meanwhile, by controlling the fiber diameter range of the first wave crest in the PTFE biaxially oriented film 22 to be smaller than or equal to that of the support layer 21, the air permeability of the PTFE biaxially oriented film can be always higher than that of the support layer 21, and the filtering effect of the support layer 21 is not affected; therefore, the physical barrier and filtration of the mask are compatible with the electret effect of the support layer 21, and the optimal barrier and breathing smoothness effect is realized.
In the third comparative example, the diameter distribution of each fiber in the PTFE biaxially oriented film was statistically random, and the filtration effect was decreased and the respiratory resistance was decreased and increased as compared with the bimodal distribution in the second example.
In the fourth comparison scheme, a double-layer melt-blown non-woven fabric layer is adopted for filtering, and the filtering effect is weaker than that of the second embodiment scheme and the third comparison scheme.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A filter device of PTFE biaxially oriented film having a bimodal distribution of fiber diameters, comprising:
the PTFE biaxial stretching film is characterized in that the diameter distribution of each fiber in the PTFE biaxial stretching film statistically has a bimodal distribution morphology;
the supporting layer is arranged on at least one side of the PTFE biaxial stretching film and forms a filtering structure with the PTFE biaxial stretching film, wherein the filtering structure comprises more than two layers;
the bimodal distribution morphology comprises:
a first peak having a diameter in a range of: 1-4 μm;
a second peak having a diameter in a range of: 10 to 20 μm.
2. The filter device of claim 1, wherein the ratio of fibers having a diameter in the first peak range is: 70% -90%, the fiber with the diameter in the second peak range accounts for the ratio: 10 to 30 percent.
3. The filtration device of PTFE biaxially oriented film having a bimodal distribution of fiber diameters as claimed in claim 1,
the maximum diameter of the diameter range of the first peaks is smaller than or equal to the fiber diameter of the support layer.
4. The filtration device of PTFE biaxially oriented film having a bimodal distribution of fiber diameters as claimed in claim 1,
the peak value of the first peak is: 2.5 μm;
the peak value of the second peak is: 14 μm.
5. The filtration device of PTFE biaxially oriented film having a bimodal distribution of fiber diameters as claimed in claim 1,
the support layer is arranged on one side of the PTFE biaxial stretching film or the support layer is arranged on both sides of the PTFE biaxial stretching film.
6. The filter device of the PTFE biaxially oriented film, according to claim 1, wherein the support layer is one or both of a non-woven fabric and a melt-blown fabric.
7. The filter device of claim 1, wherein the support layer has a fiber diameter of: 4-50 μm.
8. A mask having a PTFE biaxially oriented film with a bimodal distribution of fiber diameters, comprising:
the mask body comprises an inner layer and an outer layer, wherein the inner layer is used for fitting the face of a user;
the filter device of any of claims 1-5, disposed between the inner layer and the outer layer.
9. The mask of claim 8 wherein said inner layer comprises a non-woven fabric;
and/or, the outer layer comprises a nonwoven fabric.
10. The mask of claim 8 further comprising a strip of PTFE biaxially oriented film having a bimodal distribution of fiber diameters:
the belt body is used for keeping the mask main body on the face of a user.
CN202011467294.0A 2020-12-14 2020-12-14 Filter device and mask of PTFE (polytetrafluoroethylene) biaxial tension membrane with bimodal distribution fiber diameters Pending CN112791537A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101688342A (en) * 2007-06-22 2010-03-31 3M创新有限公司 Meltblown fiber web with staple fibre
CN103328069A (en) * 2010-12-17 2013-09-25 霍林斯沃思和沃斯有限公司 Filter media with fibrillated fibers
CN105828905A (en) * 2013-12-18 2016-08-03 曼·胡默尔有限公司 Filter Medium And Filter Element With A Filter Medium
CN106661789A (en) * 2014-09-02 2017-05-10 康明斯滤清***知识产权公司 Nonwoven web with bimodal fiber distribution
CN211730481U (en) * 2020-07-13 2020-10-23 广东金发科技有限公司 Filter equipment and gauze mask with PTFE biaxial stretching membrane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101688342A (en) * 2007-06-22 2010-03-31 3M创新有限公司 Meltblown fiber web with staple fibre
CN103328069A (en) * 2010-12-17 2013-09-25 霍林斯沃思和沃斯有限公司 Filter media with fibrillated fibers
CN105828905A (en) * 2013-12-18 2016-08-03 曼·胡默尔有限公司 Filter Medium And Filter Element With A Filter Medium
CN106661789A (en) * 2014-09-02 2017-05-10 康明斯滤清***知识产权公司 Nonwoven web with bimodal fiber distribution
CN211730481U (en) * 2020-07-13 2020-10-23 广东金发科技有限公司 Filter equipment and gauze mask with PTFE biaxial stretching membrane

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