CN213096228U - Nanofiber membrane protective facial mask - Google Patents
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- CN213096228U CN213096228U CN202020636483.5U CN202020636483U CN213096228U CN 213096228 U CN213096228 U CN 213096228U CN 202020636483 U CN202020636483 U CN 202020636483U CN 213096228 U CN213096228 U CN 213096228U
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Abstract
The utility model discloses a nanofiber membrane protective facial mask, which comprises an outer layer, an inner layer, a middle layer, an ear band and a nose bridge clip, wherein the middle layer comprises a base layer and a nanofiber membrane layer arranged on the base layer, the base layer is non-woven fabric, and the nanofiber membrane layer is combined with the base layer in an electrostatic spinning mode; the nanofiber membrane layer is adjacent to the inner layer, and the base layer is adjacent to the outer layer; the diameter of the fiber of the nano fiber film layer is 50-200 nm, and the aperture is 30-90 nm. The utility model discloses fibre membrane protective facial mask cost is lower, and the filter effect is good, the gas permeability is good, more frivolous, has broken the restriction that present filter layer in the middle of the gauze mask can only adopt melt-blown cloth, uses nanofiber membrane filter layer in gauze mask production, is favorable to stablizing market, alleviates the problem of the raw materials price rising, the gauze mask cost improvement that cause because of the unbalance supply and demand, avoids the problem of the gauze mask supply shortage that the raw materials supply is not enough to cause.
Description
Technical Field
The utility model relates to a protective facial mask technical field, concretely relates to nanofiber membrane protective facial mask.
Background
The mask is a sanitary article, is worn at the mouth and nose part and is used for filtering air entering the mouth and nose so as to achieve the effect of blocking harmful gas, smell and spray from entering and exiting the mouth and nose of a wearer, has a certain filtering effect on the air entering the lung, and can achieve the effective protective effect by wearing a proper mask when respiratory infectious diseases are prevalent or work is carried out in the environment polluted by dust and the like.
The filter layer in the middle of the existing mask generally adopts melt-blown cloth, the melt-blown cloth mainly adopts polypropylene as a main raw material, the melt-blown cloth has more gaps and a fluffy structure, and the superfine fiber with a unique capillary structure increases the fiber quantity and the surface area in unit area, so that the melt-blown cloth has good filterability, shielding property and oil absorption property. The charge adsorption capacity of the melt-blown cloth is weakened along with the change of time and environment, so that the filtering function is gradually weakened, and therefore, the mask needs to be replaced when being worn for 2 to 4 hours in places with dense pollutants and strict protection requirements.
However, when respiratory infectious diseases are epidemic, the demand of the mask is increased rapidly, the yield of melt-blown cloth is insufficient, the production requirement of the mask cannot be met, and the protection work is difficult; meanwhile, the price of the raw materials of the melt-blown cloth on the market is greatly increased, so that the cost of the mask is increased, and the mask is not favorable for the stability of the market. Therefore, it is necessary to research a protective mask which is prepared by using a filter material which has low cost and good filter effect and can replace melt-blown cloth.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a nanofiber membrane protective facial mask, its intermediate level that adopts nanofiber membrane filter layer as the gauze mask has replaced the middle filter layer of melt-blown fabric as the gauze mask, and the cost is lower, the filter effect is good.
In order to solve the technical problem, the utility model adopts the following technical scheme:
designing a nanofiber membrane protective mask, which comprises an outer layer, an inner layer, a middle layer, an ear band and a nose bridge clip, wherein the middle layer comprises a base layer and a nanofiber membrane layer arranged on the base layer, the base layer is made of non-woven fabric, and the nanofiber membrane layer is combined with the base layer in an electrostatic spinning mode; the nanofiber membrane layer is adjacent to the inner layer, and the base layer is adjacent to the outer layer; the diameter of the fiber of the nanofiber membrane layer is 50-200 nanometers, and the pore diameter is 30-90 nanometers.
The utility model discloses nanofiber membrane protective facial mask, wherein the intermediate level includes basal layer and nanofiber rete, the mode that the nanofiber rete adopted electrostatic spinning combines with substrate non-woven fabrics together, the fiber diameter of nanofiber rete is thinner, the aperture is littleer, fibre wherein is unordered, random distribution, make bigger specific surface area and higher porosity, physics filter capacity is stronger than melt-blown cloth, because it is that electrostatic spinning makes, it has good electrostatic adsorption filterable ability simultaneously, make this nanofiber rete have physics concurrently and filter with electrostatic adsorption filterable function, it uses basal layer non-woven fabrics as the carrier, constitute a kind of filter layer that can replace melt-blown cloth as the gauze mask intermediate level jointly.
Preferably, the left edge and the right edge of the inner side of the inner layer are provided with air leakage prevention side edges, each air leakage prevention side edge comprises a fixed part and a movable part, the fixed parts are fixedly connected with the vertical edge of the inner layer, and the movable parts are arranged on the inner side of the inner layer;
the air leakage preventing side edge has the same structure as the middle layer and comprises a base layer and a nanofiber membrane layer arranged on the base layer, and the nanofiber membrane layer of the air leakage preventing side edge is adjacent to the inner layer;
the ear belt is fixed on the inner side base layer of the air leakage preventing side edge and is positioned in the area of the movable part.
The existing mask has the advantages that due to the fact that the folds of pressing are arranged at the left side edge and the right side edge, when the mask is worn, the middle mouth and nose portion is opened, gaps are easily formed at the left side edge and the right side edge, the side face cannot be completely attached, and air enters and exits from the two sides during breathing, so that the protection effect is reduced. The utility model arranges the air leakage prevention side edges in the two sides of the mask, when wearing, the ear belts are opened towards the two sides, so that the movable parts of the air leakage prevention side edges are turned outwards, the ear belts are hung on ears, and the movable parts are attached to the side faces at the two sides by pulling force, so that the fold parts at the two sides of the mask can be blocked, and air leakage caused by the air passing in and out from the two sides during breathing can be avoided; leak protection gas side adopts the structure the same with the intermediate level, and the nanofiber rete is adjacent with the inlayer during movable part initial condition, and the basal layer is at the most inboard, and the ear area is opened the back, drives the movable part and opens for the nanofiber rete contact surface portion of movable part can play the filtering action, even have the air to pass in and out from the gauze mask both sides, also can obtain the filtration, plays further guard action.
Preferably, the edge of the upper part of the inner side of the inner layer is provided with a pressure-proof side edge, the pressure-proof side edge has the same structure as the middle layer, and comprises a base layer and a nanofiber membrane layer arranged on the base layer, the base layer of the pressure-proof side edge is fixed with the inner layer, and the nanofiber membrane layer of the pressure-proof side edge is used for being attached to the bridge of the nose of the face; the width of the pressure-proof side edge is larger than or equal to the width of the nose bridge clip.
When the existing mask is worn, the position of the nose bridge clip needs to be bent to fit the nose bridge, and due to the fact that the face shape of each person is different and the height of the nose bridge is different, the nose bridge cannot be completely fitted when the mask is worn, gaps are prone to occurring, air leakage is caused, and the protection effect is reduced; especially, for a person wearing glasses, fog can be formed on the glasses due to air leakage at the upper side of the mask, so that the sight is influenced, and great trouble is caused to the wearer; simultaneously the position that the bridge of the nose pressed from both sides usually has certain hardness, and for better laminating face, the bridge of the nose pressed from both sides department with hard pressure, led to the fact the indentation for bridge of the nose and face, worn the gauze mask for a long time and can cause skin wear even. The utility model arranges the pressure-proof side edge at the inner side of the nose bridge clip at the upper edge of the mask, which plays the role of a soft gasket and can reduce the indentation of the nose bridge clip to the nose bridge and the face parts at two sides; and the structure of preventing pressing the side is the same with the intermediate level, prevents pressing the basic unit of side and fixes on the inlayer, prevents pressing the inboard nanofiber membranous layer of side and face's skin contact, and its sense of touch is softer, can reduce the friction of bridge of the nose clamp department to skin, avoids long-time friction to cause skin wear.
Preferably, the nanofiber membrane layer has a porosity of 60-80%, so that the nanofiber membrane layer has good air permeability.
Preferably, the thickness of the base layer is 45-55 microns, and the thickness of the nanofiber membrane layer is 3-5 microns.
Under the same filtering condition, the overall intermediate layer used in the utility model is lighter and thinner than the melt-blown cloth, and has better air permeability; melt among the prior art and spout cloth for reaching the requirement of filter effect, can increase certain thickness usually, the gauze mask of making is heavier than, can produce the gas permeability simultaneously poor, the vexation of gas, gauze mask from both sides gas leakage scheduling problem, and the utility model discloses nanofiber membrane protective facial mask, under the condition that possesses equal filter effect, the gas permeability is better, and is lighter, can not produce the vexation of gas, gauze mask from both sides gas leakage scheduling problem.
Preferably, the nanofiber membrane layer takes polyvinylidene fluoride as a raw material.
Preferably, the polyvinylidene fluoride raw material used for each square meter of the nanofiber membrane layer is 2-4 grams. The nano fiber film layer per square meter is made of few materials, and the prepared middle layer is lighter and thinner and has lower cost.
Preferably, the inner layer and the outer layer are both non-woven fabrics.
The manufacturing method of the nanofiber membrane protective mask comprises the following steps:
(1) preparing a filter material: mounting the base material non-woven fabric on a feeding roller of an electrostatic spinning machine, and winding the movable end of the base material non-woven fabric on a winding roller by bypassing a middle transition roller; the electrostatic spinning machine takes polyvinylidene fluoride as a raw material, and a nano fiber film layer is formed by spraying the polyvinylidene fluoride to one side of the base material non-woven fabric through a spray head; cutting and rolling the substrate non-woven fabric with the formed nanofiber membrane layer to obtain a filter material serving as the middle layer of the mask;
wherein, the polyvinylidene fluoride raw material used for preparing the nano fiber film layer of each square meter is 2 to 4 grams; the thickness of the base material non-woven fabric is 45-55 microns, and the thickness of the nanofiber membrane layer is 3-5 microns; the fiber diameter of the nanofiber membrane layer is 50-200 nanometers, the pore diameter is 30-90 nanometers, and the porosity is 60-80%;
(2) preparing a mask: and (3) taking the filter material obtained in the step (1) as a mask middle layer, and taking non-woven fabrics as an outer layer and an inner layer to prepare the mask.
Preferably, in the step (2), air leakage prevention side edges are pressed at the left edge and the right edge of the inner side of the inner layer of the mask, the air leakage prevention side edges comprise a fixed part and a movable part, the fixed part is fixedly connected with the vertical edge of the inner layer, and the movable part is arranged at the inner side of the inner layer;
the air leakage preventing side edge adopts the filtering material obtained in the step (1), and comprises a base layer and a nanofiber membrane layer arranged on the base layer, wherein the nanofiber membrane layer on the air leakage preventing side edge is adjacent to the inner layer; the ear belt is fixed on the inner base layer of the air leakage preventing side edge and is positioned in the area of the movable part;
pressing a pressure-proof side edge at the upper edge of the inner side of the mask, wherein the pressure-proof side edge adopts the filtering material obtained in the step (1), and comprises a base layer and a nanofiber membrane layer arranged on the base layer, the base layer of the pressure-proof side edge and the inner layer are fixed together, and the nanofiber membrane layer of the pressure-proof side edge is used for being attached to the bridge of the nose of the face; the width of the pressure-proof side edge is larger than or equal to the width of the nose bridge clip.
The beneficial effects of the utility model reside in that:
the utility model discloses nanofiber membrane protective facial mask, the intermediate level of adoption use the non-woven fabrics as the carrier, use the nanofiber rete as the filter layer, adopt the electrostatic spinning technique to combine nanofiber membrane and non-woven fabrics together, form a filter layer in the middle of the gauze mask that can replace melt-blown cloth, it has realized that physics filters and electrostatic adsorption filter dual function combine together, and the filter effect is good, and the gas permeability is good, more frivolous, and the filter effect is better even with melt-blown cloth, guard time is longer, and the cost is lower.
The fiber diameter of the melt-blown cloth is generally 1-5 microns, while the fiber diameter of the nano fiber film layer in the utility model is 50-200 nanometers, the aperture is 30-90 nanometers, the fiber is thinner, the gap is smaller, and the material filtering effect is better; the nanofiber membrane layer is prepared by electrostatic spinning, so that the nanofiber membrane layer has the functions of physical filtration and electrostatic adsorption filtration, the filtration effect is not influenced by electric charges, the problem that the filtration effect is reduced due to electric charge attenuation generated by the melt-blown cloth along with time and environmental changes is solved, and compared with the melt-blown cloth, the protection time can be prolonged by 20 times. The nanofiber membrane is lower in cost and higher in production speed than melt-blown fabric, the productivity can reach 500 kilograms every day, 50 thousands of masks can be supplied to produce, the problem that the price of the melt-blown fabric greatly rises due to market demand can be solved, and the nanofiber membrane is a substitute product with good filtering performance and higher cost performance.
The nanofiber membrane protective mask can be provided with the air leakage prevention side edges at the left edge and the right edge of the inner side, so that air leakage at two sides of the mask is prevented, and a further protective effect is achieved; the pressure-proof side edge can be arranged at the inner side edge of the nose bridge clip, so that the face is prevented from generating pressure marks and skin abrasion.
The utility model discloses nanofiber membrane protective facial mask cost is lower, and the filter effect is good, the gas permeability is good, more frivolous, has broken the restriction that present gauze mask middle filter layer can only adopt melt-blown cloth, uses nanofiber membrane filter layer in gauze mask production, is favorable to stablizing market, alleviates the problem of the raw materials price rising, the gauze mask cost improvement that cause because of the unbalance of supply and demand, avoids the problem of the gauze mask supply shortage that the raw materials supply is not enough to cause.
Drawings
Fig. 1 is a schematic inner side structure diagram of an embodiment of the nanofiber membrane protective mask of the present invention;
FIG. 2 is a schematic view of the layered structure of the nanofiber membrane respirator of FIG. 1;
FIG. 3 is a schematic view of the inner side of another embodiment of the nanofiber membrane protective mask of the present invention;
FIG. 4 is a schematic view of the opened ear band of FIG. 3;
fig. 5 is a schematic inner side view of another embodiment of the nanofiber membrane protective mask of the present invention;
the label in the figure, 1 outer layer, 2 inlayers, 3 basal layers, 4 nanofiber membranous layers, 5 ear areas, 6 bridge of the nose presss from both sides, 7 leak protection gas sides, 8 prevent pressing the side.
Detailed Description
The following examples are provided to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way. The apparatus elements referred to in the following examples are, unless otherwise specified, conventional apparatus elements; the industrial raw materials are all conventional industrial raw materials which are sold on the market, if not specifically mentioned.
Example 1: a nanofiber membrane protective mask is shown in figures 1-2 and comprises an outer layer 1, an inner layer 2, a middle layer, an ear band 5 and a nose bridge clip 6, wherein the inner layer 2 and the outer layer 1 are made of non-woven fabrics. The middle layer comprises a base layer 3 and a nanofiber membrane layer 4 arranged on the base layer 3, the base layer 3 is made of non-woven fabric, and the nanofiber membrane layer 4 is combined with the base layer 3 in an electrostatic spinning mode; the nanofiber membrane layer 4 is adjacent to the inner layer 2, and the base layer 3 is adjacent to the outer layer 1; the diameter of the fiber of the nano fiber film layer 4 is 50-200 nm, and the aperture is 30-90 nm.
Wherein, the porosity of the nanofiber membrane layer 4 is 60-80%; the thickness of the basic layer 3 is 45-55 microns, and the thickness of the nanofiber membrane layer 4 is 3-5 microns; the nanofiber membrane layer 4 takes polyvinylidene fluoride as a raw material, and the polyvinylidene fluoride raw material used by each square meter of the nanofiber membrane layer 4 is 2-4 g.
Example 2: a nanofiber membrane protective mask, refer to fig. 3, 4, the difference with embodiment 1 lies in, there are leak-proof sides 7 in the inboard left and right edges of the inner layer 2, leak-proof side 7 includes fixed portion and movable part, the fixed portion is fixedly connected with vertical edge of the inner layer 2 together, the movable part is put in the inboard of the inner layer 2; the air leakage preventing side edge 7 has the same structure as the middle layer and comprises a base layer and a nanofiber membrane layer arranged on the base layer, and the nanofiber membrane layer of the air leakage preventing side edge 7 is adjacent to the inner layer; the ear belt 5 is fixed on the inner base layer of the air leakage preventing side 7 and is positioned in the area of the movable part.
Example 3: a nanofiber membrane protective mask, see figure 5, with embodiment 2 difference lie in, inner side upper edge of inner layer 2 have prevent press side 8, prevent press side 8 with intermediate layer structure the same, including basic layer and set up in basic layer nanofiber membranous layer, and the basic layer and inner layer 2 of preventing pressing the side are fixed together, prevent pressing the nanofiber membranous layer of side 8 to use for the bridge of the nose of the face; the width of the pressure side edge 8 is greater than or equal to the width of the bridge clip.
The middle part of the pressure-proof side edge 8 can be fixed with the inner layer 2, and the upper part of the pressure-proof side edge is flush with the upper edge of the mask, or the upper part of the pressure-proof side edge extends out of the upper edge of the mask; both ends of the pressure-proof side 8 may be set in an arc shape.
The manufacturing method of the nanofiber membrane protective mask comprises the following steps:
(1) preparing a filter material: mounting the base material non-woven fabric on a feeding roller of an electrostatic spinning machine, and winding the movable end of the base material non-woven fabric on a winding roller by bypassing a middle transition roller; the electrostatic spinning machine takes polyvinylidene fluoride as a raw material, and a nano fiber film layer is formed by spraying the polyvinylidene fluoride to one side of the base material non-woven fabric through a spray head; cutting and rolling the substrate non-woven fabric with the formed nanofiber membrane layer to obtain a filter material serving as the middle layer of the mask;
wherein, the polyvinylidene fluoride raw material used for preparing the nano fiber film layer of each square meter is 2 to 4 grams; the thickness of the base material non-woven fabric is 45-55 microns, and the thickness of the nano fiber film layer is 3-5 microns; the diameter of the fiber of the nano fiber film layer is 50-200 nm, the aperture is 30-90 nm, and the porosity is 60-80%;
(2) preparing a mask: and (3) taking the filter material obtained in the step (1) as a mask middle layer, and taking non-woven fabrics as an outer layer and an inner layer to prepare the mask.
Further, in the step (2), air leakage prevention side edges are pressed at the left edge and the right edge of the inner side of the inner layer of the mask, each air leakage prevention side edge comprises a fixed part and a movable part, the fixed parts are fixedly connected with the vertical edge of the inner layer, and the movable parts are arranged on the inner side of the inner layer;
the air leakage prevention side edge adopts the filtering material obtained in the step (1), and comprises a base layer and a nanofiber membrane layer arranged on the base layer, wherein the nanofiber membrane layer on the air leakage prevention side edge is adjacent to the inner layer; the ear belt is fixed on the inner base layer of the air leakage preventing side edge and is positioned in the area of the movable part;
further, a pressure-proof side edge is pressed at the upper edge of the inner side of the inner layer of the mask, the pressure-proof side edge adopts the filtering material obtained in the step (1), and comprises a base layer and a nanofiber membrane layer arranged on the base layer, the base layer and the inner layer of the pressure-proof side edge are fixed together, and the nanofiber membrane layer of the pressure-proof side edge is used for being attached to the bridge of the nose of the face; the width of the pressure-proof side edge is larger than or equal to the width of the nose bridge clip.
Adopt YY 0469 one-shot 2011 "medical surgery gauze mask" standard right the utility model discloses nanofiber membrane protective facial mask inspects, the inspection project: particle Filtration Efficiency (PFE) and pressure difference (Δ P), the test results are as follows:
according to the above test results, the filtration efficiency of the nanofiber membrane protective mask for non-oily particles of the utility model reaches more than 78%, and the filtration efficiency meets the particle filtration efficiency detection standard of YY 0469-; the biggest only 38Pa of pressure differential of gauze mask both sides face explains the utility model discloses nanofiber membrane protective mask's gas permeability is better, adopts the nanofiber membrane as the intermediate level of gauze mask, can not produce vexation, airtight problem, can avoid running out from the gauze mask both sides because of the not good air permeability of messenger's exhalation air, causes the problem that the protectiveness of gauze mask reduces.
Adopt GB 19083-: "filtration efficiency", "airflow resistance", test results are as follows:
from above testing result can know, under the gas flow is 85L/min circumstances, the gauze mask has reached 95% requirement to the filtration efficiency of non-oily granule, and the resistance of breathing in of gauze mask also accords with detection standard completely, explains the utility model discloses a nanofiber rete is as the middle filter layer of gauze mask, and its filter effect and gas permeability are all good.
The present invention has been described in detail with reference to the embodiments, but those skilled in the art will understand that the specific parameters in the embodiments can be changed without departing from the spirit of the present invention to form a plurality of specific embodiments, which are the common variation range of the present invention, and the detailed description is omitted here.
Claims (7)
1. A nanofiber membrane protective mask comprises an outer layer, an inner layer, a middle layer, an ear band and a nose bridge clip, and is characterized in that the middle layer comprises a base layer and a nanofiber membrane layer arranged on the base layer, the base layer is made of non-woven fabric, and the nanofiber membrane layer is combined with the base layer in an electrostatic spinning mode; the nanofiber membrane layer is adjacent to the inner layer, and the base layer is adjacent to the outer layer; the diameter of the fiber of the nanofiber membrane layer is 50-200 nanometers, and the aperture is 30-90 nanometers;
the inner side of the inner layer is provided with air leakage prevention side edges at the left edge and the right edge, each air leakage prevention side edge comprises a fixed part and a movable part, the fixed parts are fixedly connected with the vertical edge of the inner layer, and the movable parts are arranged on the inner side of the inner layer;
the air leakage preventing side edge has the same structure as the middle layer and comprises a base layer and a nanofiber membrane layer arranged on the base layer, and the nanofiber membrane layer of the air leakage preventing side edge is adjacent to the inner layer;
the ear belt is fixed on the inner side base layer of the air leakage preventing side edge and is positioned in the area of the movable part.
2. The nanofiber membrane protective mask according to claim 1, wherein a pressure-proof side is provided at the upper edge of the inner side of the inner layer, the pressure-proof side has the same structure as the intermediate layer and comprises a base layer and a nanofiber membrane layer provided on the base layer, the base layer of the pressure-proof side is fixed with the inner layer, and the nanofiber membrane layer of the pressure-proof side is used for fitting the bridge of the nose of the face; the width of the pressure-proof side edge is larger than or equal to the width of the nose bridge clip.
3. The nanofiber membrane protective mask according to claim 1, wherein the nanofiber membrane layer has a porosity of 60-80%.
4. The nanofiber membrane protective mask according to claim 1, wherein the thickness of the base layer is 45-55 microns and the thickness of the nanofiber membrane layer is 3-5 microns.
5. The nanofiber membrane protective mask according to claim 1, wherein the nanofiber membrane layer is made of polyvinylidene fluoride.
6. The nanofiber membrane protective mask according to claim 1, wherein the polyvinylidene fluoride raw material is 2 to 4 g per square meter of the nanofiber membrane layer.
7. The nanofiber membrane protective mask according to claim 3, wherein the inner layer and the outer layer are both nonwoven fabrics.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020636483.5U CN213096228U (en) | 2020-04-24 | 2020-04-24 | Nanofiber membrane protective facial mask |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020636483.5U CN213096228U (en) | 2020-04-24 | 2020-04-24 | Nanofiber membrane protective facial mask |
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| CN213096228U true CN213096228U (en) | 2021-05-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111387609A (en) * | 2020-04-24 | 2020-07-10 | 河南曼博睿新材料科技有限公司 | Nanofiber membrane protective mask and manufacturing method thereof |
| CN113455757A (en) * | 2021-06-15 | 2021-10-01 | 台州市药品检验研究院 | Mask nose clip device, mask and manufacturing process thereof |
-
2020
- 2020-04-24 CN CN202020636483.5U patent/CN213096228U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111387609A (en) * | 2020-04-24 | 2020-07-10 | 河南曼博睿新材料科技有限公司 | Nanofiber membrane protective mask and manufacturing method thereof |
| CN113455757A (en) * | 2021-06-15 | 2021-10-01 | 台州市药品检验研究院 | Mask nose clip device, mask and manufacturing process thereof |
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