JP2019026952A - mask - Google Patents

Abstract

To provide a mask which does not comprise a shield member, with which spectacles are hard to cloud and which are hard to shield a field of view even under environment of a low temperature.SOLUTION: A mask comprises a mask body including non-woven fabric and ear hooks which can fix the mask body to ears. A ventilation coefficient (Ca) calculated from the following formula is 50 to 200. Ca=Ap×Se (Here, Ap means air permeability (unit:cm/cmsec.) of a mask body, Se means stress (unit: N) when the ear hooks are expanded by 95 mm).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mask. More specifically, the present invention relates to a mask in which glasses are not easily fogged and the field of view is not obstructed even when the mask is worn when the temperature is low. In particular, the present invention relates to a pleated mask that does not obstruct visibility.

  Conventionally, when a mask is worn when the temperature is low, there is a problem that the glasses become cloudy and obstruct the field of view. As one method for solving such a problem, a contact member that can be deformed so as to be in close contact with the nose bridge and maintain its shape, for example, a close contact member made of a metal such as mild steel or aluminum (sometimes called a nose clip). ) At the end of the mask on the nasal bridge side. However, even if such a close contact member is provided, it has not been possible to sufficiently solve the problem that a gap is generated between the mask and the nasal bridge due to an increase in the internal pressure of the mask due to exhalation, and the exhalation leaks and the glasses become cloudy.

  As another method for solving the above problem, a shielding member is provided between the mask and the face so that exhalation does not reach the glasses. For example, Japanese Patent Laid-Open No. 2012-135598 (Patent Document 1) is a mask that includes a mask body and a pocket portion that is open at the top, and can store a functional sheet in the pocket portion, and closes the opening of the pocket portion. It is disclosed that when the lid portion is made of a water-absorbing nonwoven fabric, moisture in the breath can be adsorbed and fogging of the glasses can be effectively prevented.

  However, even if a shielding member such as a lid disclosed in Patent Document 1 is provided inside the mask so as to be in contact with the face, there is a gap between the mask and the nasal bridge due to an increase in the internal pressure of the mask due to exhalation. Could not be solved satisfactorily. In addition, there is a problem in that the mask processing of providing a shielding member is complicated. Therefore, there has been a demand for a mask that can improve the problem of fogging without providing a shielding member.

JP 2012-135598 A

  The present invention has been made under such circumstances, and an object of the present invention is to provide a mask that does not have a shielding member and is less likely to fog up glasses and obstruct visibility even in an environment where the temperature is low.

The present invention is a mask having a mask body including a nonwoven fabric and an ear hooking member capable of fixing the mask body to the ear, and having a ventilation coefficient (Ca) calculated from the following formula of 50 to 200: To mask.
Ca = Ap × Se
Here, Ap means the air permeability of the mask body (unit: cm ³ / cm ² · sec.), And Se means the stress (unit: N) when the ear hook member is elongated by 95 mm. Is.

The mask of the present invention has “the air permeability of the mask body is 50 cm ³ / cm ² · sec. Or more”, “having a charged nonwoven fabric as the nonwoven fabric constituting the mask body”, “the mask body is composed of two or more nonwoven fabrics. And / or “the mask body is a folded pleated mask”.

  The inventors of the present invention have glasses having an air permeability coefficient of 50 to 200, which is a product of the air permeability of the mask body and the stress of the ear hooking member, even in an environment where the temperature is low even without a shielding member. It was found that the mask is not cloudy and does not obstruct the view. This breathing coefficient is that if the air permeability of the mask body is high, exhaled air will pass through the mask body and diffuse to the external environment, and the glasses will not be cloudy. Even if the air permeability of the mask body is high, Inadequate adhesion to the face was found from the fact that due to an increase in the internal pressure of the mask due to exhalation, exhaled air aerated through the gap between the mask body and the face (especially the nasal bridge) and the glasses became cloudy. It is a coefficient.

  In other words, when the air permeability of the mask body is high, the numerical value of the air permeability increases, but in this case, because the air permeability is excellent and the internal pressure of the mask does not increase easily due to exhalation, the mask body adheres to the face. The stress of the ear hook member may be small. On the other hand, when the air permeability of the mask body is relatively low, the numerical value of the air permeability becomes small. Therefore, it is necessary to increase the stress of the ear hook member for bringing the mask body into close contact with the face. As described above, since there is an inversely proportional relationship between the air permeability of the mask main body and the stress of the ear hooking member, the product of the air permeability of the mask main body and the stress of the ear hooking member falls within a certain range. , I found that the mask is not cloudy and obstructs the view.

The air permeability of the mask body of the present invention is 50 cm ³ / cm ² · sec. When the air permeability is high as described above, even if the stress on the ear hooking member is small, the glasses are not easily fogged, so that the burden on the ear is small and the ear does not hurt easily. Therefore, the mask is easy to wear for a long time.

  As a non-woven fabric constituting the mask body of the present invention, if it has a charged non-woven fabric, it has excellent removability of harmful substances such as dust and pollen even if the air permeability of the mask body is high. It is a mask that can.

  When the mask main body of the present invention is composed of two or more nonwoven fabrics, each nonwoven fabric can have various functions such as filtration performance, skin contact property, and abrasion resistance. Therefore, it can be a mask having excellent functionality.

  Even if the mask body of the present invention is a pleated mask in which the mask body is folded and a mask easily forms a gap between the mask and the face (particularly the nasal bridge), the ventilation coefficient is 50 to 200, Even if there is no shielding member, even in an environment where the temperature is low, the mask is less likely to cloud and the view is not obstructed.

Front view of an external environment side of a pleated mask as an example of the mask of the present invention A-A line sectional view in FIG. An example of a sectional view of the mask body of the present invention Sectional drawing of the mask main body in the B section in FIG. Conceptual diagram showing a method of measuring stress when the ear hooking member is extended by 95 mm Sectional view of the mask body of the embodiment External environment side front view of the mask body of the embodiment

  FIG. 1 is a front view of the external environment side of a pleated mask as an example of the mask of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. Description will be made based on FIG. 3 which is an example of FIG. 4 and FIG. In FIG. 1, the upper side is the nasal bridge side, the lower side is the chin side, the left side is the right ear side, and the right side is the left ear side.

  As shown in FIG. 1, the mask of the present invention has a rectangular outer shape, a mask main body 1 including a non-woven fabric, and a left ear side and a right ear side of the mask main body 1 so that the mask main body 1 can be fixed to the ear. It can be a mask having a pair of ear hooking members 2a and 2b fixed to both ends.

  The mask main body 1 in FIG. 1 is basically composed of a laminated nonwoven fabric 16 in which three nonwoven fabrics are laminated, as shown in FIG. 2, from the nasal bridge side to the jaw side, in order, a valley fold ridge 19a and a mountain fold ridge 17a. In this state, it is folded so as to have a mountain folding rod 17b, a valley folding rod 19b, a mountain folding rod 17c, and a valley folding rod 19c. Therefore, when the mask is worn, by pulling the mask body 1 toward the nasal bridge side and / or the chin side, the valley folds 19a, 19b, 19c are pushed out toward the external environment side O, and a dome-shaped three-dimensional space is formed. Since it can be formed, the mask can be worn with little contact with the face and has an excellent wearing feeling.

  Further, in the vicinity of the nasal bridge side end portion and the chin side end portion of the mask body 1 in FIG. 1, there are fusion portions 11 a and 13 that extend intermittently from the left ear side to the right ear side, respectively. Thus, by having the fusion | melting parts 11a and 13 extended intermittently, each nonwoven fabric of the laminated nonwoven fabric 16 which comprises the mask main body 1 is being fixed, and between the nonwoven fabrics of the laminated nonwoven fabric 16 at the time of mask use No peeling occurs.

  In addition, the fusion part which intermittently extends from the left ear side to the right ear side in parallel with the fusion part 11a on the jaw side slightly separated from the fusion part 11a which extends intermittently in the vicinity of the end part on the nose bridge side Part 11b. Thus, a small space is formed by the fused portion 11a and the fused portion 11b, and the flat plate-like adhesion member 11 that can improve the adhesion to the nasal bridge is inserted and held in this small space. Yes. Therefore, when wearing the mask, the contact member 11 can be deformed according to the nasal bridge to improve the close contact between the mask body 1 and the face, and it is difficult for exhalation to vent the gap between the mask body and the nasal bridge. Is less cloudy.

  The contact member 11 may be any material that can be easily deformed by hand, and is not particularly limited. For example, a metal such as mild steel or aluminum, a metal covered with plastic, and a plastic And composite materials containing inorganic fillers such as glass fiber, talc, mica and calcium carbonate in plastics such as polyethylene.

  Further, the central portion of the mask body 1 has fusion portions 12a and 12b extending intermittently in parallel from the left ear side to the right ear side, and is formed by these fusion portions 12a and 12b. The flat shape-retaining member 12 is inserted into the small space, and the dome-shaped three-dimensional space formed by the development of the mask body 1 can be held when wearing the mask, so that the wearing feeling is not impaired. Easy to wear, mask continuously. In addition, the expansion of the mask body 1 increases the breathing area of the exhaled breath. By maintaining this wide ventilation area, the pressure per unit area of the mask body 1 can be reduced, and the mask body 1 and the face are in close contact with each other. Since it is difficult to impair the performance, it is difficult for exhaled air to pass through the gap between the inside of the mask body and the face, and the glasses are more difficult to cloud.

  The shape holding member 12 may be any material that can hold a dome-shaped three-dimensional space when wearing a mask, and is not particularly limited. For example, a metal such as mild steel or aluminum, a synthetic resin such as polyethylene or polypropylene, a metal And a composite material of a metal and a plastic coated with a plastic, a composite material containing an inorganic filler such as glass fiber, talc, mica, and calcium carbonate in a plastic such as polyethylene.

  Further, the mask body 1 has fusion portions 14a and 14b at the upper end portion and the lower end portion thereof on the left ear side, and the ear hooking member 2a is fixed to the fusion portions 14a and 14b. In addition to these fused portions 14a and 14b, two rows of fused portions 15a extending intermittently from the nasal bridge side to the chin side are provided on the mask body center side. Similarly, the mask main body 1 has fused portions 14c and 14d at the upper and lower end portions on the right ear side, respectively, and the ear hooking member 2b is fixed to the fused portions 14c and 14d. In addition to the fused portions 14c and 14d, two rows of fused portions 15b extending intermittently from the nasal bridge side to the chin side are provided on the mask body center side. Thus, the folded state in the mask main body 1 is maintained by the fused portions 14a, 14b, 14c, 14d, 15a, and 15b.

  The mask of the present invention has ear hooking members 2a and 2b in addition to the mask body 1 as described above. As described above, the ear hooking members 2a and 2b are fused and fixed to the fused portions 14a and 14b at the left ear side end of the mask body 1 and the fused portions 14c and 14d at the right ear side end, respectively. Therefore, the mask main body 1 can be securely fixed to the ear.

  The ear hooking members 2a and 2b may be any material as long as the mask main body 1 can be hooked on the ear, and is not particularly limited. For example, rubber such as round rubber or flat rubber; elastomer resin such as polyurethane is used. Examples thereof include string; elastomer fiber-containing woven fabric, knitted fabric or nonwoven fabric; highly crimped fiber-containing nonwoven fabric. The cross-sectional shape of the ear hooking members 2a and 2b is not particularly limited, but is rectangular, oval or elliptical so that the burden on the ear is small and the ear does not hurt even if the mask is worn for a long time. Is preferred.

The mask of the present invention has the mask body 1 and the ear hooking members 2a and 2b as described above, and the air permeability coefficient (Ca) calculated from the following formula is 50 to 200, preferably 52 to 190. More preferably, it is 55-180, More preferably, it is 58-170, More preferably, it is 60-160, More preferably, it is 60-150, More preferably, it is 62-140.
Ca = Ap × Se
Here, Ap means the air permeability of the mask body (unit: cm ³ / cm ² · sec.), And Se means the stress (unit: N) when the ear hook member is elongated by 95 mm.

  This breathing coefficient is that if the air permeability of the mask body is high, exhaled air will pass through the mask body and diffuse to the external environment, and the glasses will not be cloudy. Even if the air permeability of the mask body is high, Inadequate adhesion to the face was found from the fact that due to an increase in the internal pressure of the mask due to exhalation, exhaled air aerated through the gap between the mask body and the face (especially the nasal bridge) and the glasses became cloudy. It is a coefficient.

  In other words, when the air permeability of the mask body is high, the numerical value of the air permeability increases, but in this case, because the air permeability is excellent and the internal pressure of the mask does not increase easily due to exhalation, the mask body adheres to the face. The stress of the ear hook member may be small. On the other hand, when the air permeability of the mask body is relatively low, the numerical value of the air permeability becomes small. Therefore, it is necessary to increase the stress of the ear hook member for bringing the mask body into close contact with the face. As described above, since there is an inversely proportional relationship between the air permeability of the mask main body and the stress of the ear hooking member, the product of the air permeability of the mask main body and the stress of the ear hooking member falls within a certain range. They found that the glasses are masks that are not cloudy and do not obstruct the field of view.

The air permeability of the mask main body 1 of the present invention is 50 cm ³ / cm ² · sec. So that exhaled air can pass through the mask main body 1 and diffuse to the external environment, and the glasses are not easily fogged. The above is preferable, and the higher the air permeability, the better the action, so 60 cm ³ / cm ² · sec. The above is preferable, and 70 cm ³ / cm ² · sec. More preferably, it is 80 cm ³ / cm ² · sec. More preferably, it is 90 cm ³ / cm ² · sec. More preferably, it is 100 cm ³ / cm ² · sec. More preferably, it is 110 cm ³ / cm ² · sec. More preferably, it is 120 cm ³ / cm ² · sec. More preferably, it is 130 cm ³ / cm ² · sec. The above is more preferable. In addition, since the higher the air permeability, the better the action, the upper limit of the air permeability is not particularly limited, but as one performance of the mask, when considering the removal of harmful substances, 300 cm ³ / cm ² · sec. So that the removal of harmful substances is excellent. Or less, preferably 250 cm ³ / cm ² · sec. More preferably, it is 220 cm ³ / cm ² · sec. More preferably, it is as follows.

  This air permeability (Ap) refers to a value measured according to 6.8.1 (Fragile type method) defined in JIS L1913: 2010 “General nonwoven fabric test method”. That is, it refers to a value measured using a fragile type tester and using a test piece having a size corresponding to the fragile type tester to be used. In the case of a pleat type like the mask shown in FIG. 1, since it will unfold when worn and breathe will breathe through one set of laminated nonwoven fabric, one set with the upper, lower, left and right fused parts removed. A test piece is sampled from the center of the flat laminated nonwoven fabric and the air permeability is measured. In addition, as in the case of the mask shown in FIG. 1, when there is a possibility that air leakage may occur during the test, such as when the shape maintaining member 12 is provided at the center of the mask body 1, The air permeability of the mask main body 1 from which a material that may cause leakage (in the case of FIG. 1, the shape retaining member 12) is removed is measured. Furthermore, in the mask according to the present invention, exhaled air mainly ventilates the central portion of the mask body and is discharged to the external environment, so that the material (laminated nonwoven fabric 16 in FIG. 1) existing in the central portion of the mask body. Measure the air permeability. For example, even in the case of including a low-breathing sheet 18 as will be described later, the low-breathing sheet 18 does not constitute the central portion of the mask body and basically does not hinder the breathing of exhalation. The air permeability of the material (laminated nonwoven fabric 16 in FIG. 1) present in the central portion of the mask body excluding 18 is measured.

  On the other hand, the stress when the ear hooking member is stretched by 95 mm (Se, hereinafter may be simply referred to as “stress during stretching”) is not particularly limited as long as the above formula is satisfied in relation to the air permeability. However, if the stress at the time of extension is too strong, the burden on the ear is large, the ear is likely to hurt, and it tends to be painful to wear for a long time. It is more preferably 40N or less, further preferably 1.20N or less, and further preferably 1.00N or less. On the other hand, the stress at the time of elongation is preferably 0.30 N or more, more preferably 0.35 N or more, and further preferably 0.40 N or more so that the mask body 1 can easily adhere to the face. More preferably, it is 0.50 N or more.

  This elongation stress is the stress when the ear hook member is elongated by 95 mm. In other words, the shape of the face varies between individuals and cannot be determined unconditionally. Therefore, when the test head specified in JIS T8151: 2005 “Dust-proof mask” is used as a reference, the ear-hook member is in an extended state of 95 mm. Since it will be attached, it was judged by the stress when it was extended by 95 mm. Specifically, as shown in a conceptual diagram showing a method of measuring stress at elongation in FIG. 5, the ear side end of the mask body 1 is fixed to the chuck C of the tensile tester, and the size of an adult's ear is assumed. After hooking one of the ear hook members 2a and 2b on the cylindrical hook F having a diameter of 50 mm, the cylindrical hook F is raised until the distance from the chuck C to the upper end of the cylindrical hook F becomes 95 mm. Measure the stress in the applied state. This stress is measured five times, the result is arithmetically averaged, and the third decimal place is rounded off to obtain the stress at 95 mm elongation.

  As described above, the mask main body 1 in FIG. 1 includes the laminated nonwoven fabric 16 in which three nonwoven fabrics are laminated. A description will be given based on FIG. 3 which is a cross-sectional view showing the laminated state. In FIG. 3, the outer nonwoven fabric 16a located on the external environment side O, the mouth nonwoven fabric 16c located on the mouth side I, and the filtering nonwoven fabric 16b located between the outer nonwoven fabric 16a and the mouth nonwoven fabric 16c and having a filtering action Have The outer nonwoven fabric 16a is mainly provided to prevent the filtration nonwoven fabric 16b from being damaged and to impart abrasion resistance to the mask. The mouth nonwoven fabric 16c is mainly damaged by the filtration nonwoven fabric 16b. In addition to preventing wear and imparting abrasion resistance to the mask, the skin of the face is not impaired, and it has excellent skin contact properties. On the other hand, the filtration nonwoven fabric 16b has a filtration performance and has a small influence on the human body due to harmful substances such as dust and pollen.

First, the filtration nonwoven fabric 16b will be described. The filtration nonwoven fabric 16b has a high air permeability of the mask main body 1 so that the breath can be ventilated to the external environment side O, and can be easily diffused. The fragile air permeability of the filtered nonwoven fabric 16b is 50 to 400 cm ³ / cm ² · sec. It is preferable that it is 70-350 cm < ³ > / cm < ² > * sec. More preferably, it is 90-300 cm < ³ > / cm < ² > * sec. More preferably.

  In addition, the filtration nonwoven fabric 16b preferably has a NaCl dust collection efficiency of 50% or more, more preferably 60% or more, and 70% or more so that the influence of harmful substances on the human body can be reduced. More preferably, it is more preferably 80% or more, still more preferably 90% or more, still more preferably 95% or more, and still more preferably 97% or more.

This “NaCl dust collection efficiency (Fe, unit:%)” is obtained by using a mask performance test apparatus (manufactured by Shibata Kagaku, mask performance inspection apparatus AP-9000 type), and filtering the non-woven fabric 16b with an effective filtration area of 124 cm ² (diameter). : NaCl particle-containing air (NaCl particle median diameter: 0.06 to 0.10 μm, geometric standard deviation: 1.8 or less, dust concentration: 50 mg / m ³ or less) 30 L (liter) / min. The NaCl particle concentration (Pb, unit: mg / m ³ ) before passing through the filtered nonwoven fabric 16b and the NaCl particle concentration after passing (Pa, unit: mg / m ³ ) were measured. This is a value calculated from the equation. This high collection efficiency means that the collection performance for harmful substances is high.
Fe = [(Pb−Pa) / Pb] × 100

  Thus, since the filtration nonwoven fabric 16b preferably has high air permeability and excellent filtration performance, it is preferably made of a charged nonwoven fabric. This is because harmful substances such as dust and pollen can be removed by an electrostatic action in addition to a physical action, and it is easy to achieve both air permeability and filtration performance. As such a charged non-woven fabric 16b, for example, (1) a non-woven fabric charged by utilizing friction between non-woven fabric constituent fibers, (2) after forming the non-woven fabric, a force is applied via corona discharge, polar liquid, etc. Non-woven fabrics electrified by charging treatment and charged, (3) Non-woven fabrics formed from fibers formed by tearing a charged film, and the like.

  Among these, it is preferable that the nonwoven fabric is easy to achieve both air permeability and filtration performance, and (1) is a nonwoven fabric charged by utilizing friction between the nonwoven fabric constituting fibers. The suitable constituent fibers of the friction-charged non-woven fabric are a combination of polyolefin fibers (especially polypropylene fibers) and acrylic fibers, polyolefin fibers (particularly polypropylene fibers) and polyester so that they can be easily charged by friction. It is preferable to include a combination with a fiber, a combination of a polyolefin fiber (particularly polypropylene fiber) and a polylactic acid fiber. Note that the friction charging method includes, for example, a fiber opening operation by a card machine or the like when opening the fiber, an entanglement operation when the fiber web is entangled with a needle or the like, or a fiber web caused by a roller, gas collision or the like. Or the squeezing action of a nonwoven fabric etc. can be mentioned.

  The fibers constituting the filtration nonwoven fabric 16b of the present invention are not limited to the fiber combinations as described above. For example, regenerated fibers such as rayon and cupra; semi-synthetic fibers such as acetate; nylon, vinylon, vinylidene, polychlorinated Synthetic fibers made of a single resin such as vinyl, polyester, acrylic, polyolefin (polypropylene, polyethylene, etc.), polyurethane, or containing two or more of these resins; plant fibers such as cotton and hemp; animal fibers such as wool and silk; Etc. alone or in combination of two or more.

  The fineness of the fibers constituting the filtration nonwoven fabric 16b is not particularly limited, but is preferably 0.8 to 10.0 dtex so that the air permeability is high and the filtration performance is excellent. It is more preferably 6.6 dtex, and further preferably 1.3 to 3.3 dtex. The fiber length of the fibers constituting the filtration nonwoven fabric 16b is not particularly limited, but is preferably 20 to 102 mm, and preferably 25 to 72 mm so that the fibers are uniformly dispersed and excellent in filtration performance. Is more preferable, and it is still more preferable that it is 32-64 mm.

  In addition, the fiber which comprises the filtration nonwoven fabric 16b can be couple | bonded by the adhesion | attachment by a binder, the melt | fusion by a constituent fiber, and / or the entanglement of the fibers by a needle, a water flow, etc., for example.

Furthermore, the basis weight of the filtering nonwoven fabric 16b is not particularly limited, but is preferably 15 to 300 g / m ² so that it is excellent in removing harmful substances and excellent in processability to a mask. More preferably, it is -200 g / m < ² >, and it is still more preferable that it is 50-150 g / m < ² >. Further, the thickness of the filtering nonwoven fabric 16b is not particularly limited, but is preferably 0.2 to 4.0 mm, and preferably 0.4 to 3.0 mm so as to be excellent in workability to a mask. Is more preferable, and it is still more preferable that it is 0.6-2.0 mm. In addition, the thickness of the nonwoven fabric in this invention including the thickness of a filtration nonwoven fabric means the thickness measured with the compression elasticity tester of contact area 5cm < ² > and load 0.98N.

Next, the outer nonwoven fabric 16a will be described. It is preferable that the outer nonwoven fabric 16a has a high air permeability so that the air permeability of the mask body 1 is high, and the exhaled breath is easily diffused to the external environment side O. More specifically, the fragile air permeability of the outer nonwoven fabric 16a is 100 to 800 cm ³ / cm ² · sec. It is preferable that it is 200-700 cm < ³ > / cm < ² > * sec. It is more preferable that it is 300-600 cm < ³ > / cm < ² > * sec. More preferably.

  As described above, the outer non-woven fabric 16a is a non-woven fabric that mainly exerts an effect of imparting abrasion resistance to the mask in order to prevent the filtering non-woven fabric 16b from being damaged. Examples of the nonwoven fabric excellent in abrasion resistance include a nonwoven fabric bonded with a sufficient amount of a binder and a nonwoven fabric in which constituent fibers are fused. Among these, since the nonwoven fabric bonded with the binder may generate a contaminant due to the binder, the nonwoven fabric with the constituent fibers fused is preferable. As described above, the outer nonwoven fabric 16a is preferably a nonwoven fabric in which constituent fibers are fused. However, the outer nonwoven fabric 16a is preferably a nonwoven fabric in which fibers are fused by pressing so as to be more excellent in wear resistance. However, if the entire surface of the outer nonwoven fabric 16a is fused to each other by pressurization, not only the air permeability tends to be lowered, but also the texture becomes hard, and the texture of the mask body 1 tends to be impaired and the wearing feeling tends to be impaired. Therefore, it is preferably a nonwoven fabric in which the fibers are partially fused together by pressurization. More specifically, 3 to 50% of the area when the surface of the outer nonwoven fabric 16a is assumed to be a smooth flat surface is preferably a nonwoven fabric partially fused with fibers, and 5 to 30%. It is more preferable that it is a nonwoven fabric partially fused with fibers, and 8 to 20% is still more preferably a nonwoven fabric partially fused with fibers.

  The fibers constituting the outer nonwoven fabric 16a are not particularly limited, but may be regenerated fibers, semi-synthetic fibers, synthetic fibers, plant fibers, and / or animal fibers, etc., similar to the filtering nonwoven fabric 16b. As mentioned above, since it is preferably a non-woven fabric in which constituent fibers are fused, it preferably contains synthetic fibers, particularly thermoplastic synthetic fibers.

  The fiber diameter of the fibers constituting the outer nonwoven fabric 16a is not particularly limited, but is preferably 10 to 40 μm, and preferably 12 to 35 μm so that the air permeability is high and the wear resistance is excellent. Is more preferable, and it is still more preferable that it is 15-30 micrometers. The fiber length of the fibers constituting the outer nonwoven fabric 16a is not particularly limited, but is preferably made of continuous fibers so that the fibers are less likely to fluff.

Further, the basis weight of the outer nonwoven fabric 16a is not particularly limited, but is preferably 10 to 70 g / m ² in order to ensure wear resistance while suppressing a decrease in air permeability, and is preferably 15 to 50 g / m ^2. m ² is more preferable, and 20 to 30 g / m ² is even more preferable. Further, the thickness of the outer nonwoven fabric 16a is not particularly limited, but is preferably 0.08 to 1.0 mm in consideration of processability while maintaining the shape retaining property of the mask. More preferably, it is -0.6mm, and it is still more preferable that it is 0.15-0.4mm.

The mouth non-woven fabric 16c will be described. It is preferable that the mouth non-woven fabric 16c has a high air permeability so that the air permeability of the mask body 1 is high and the breath is easily ventilated to the external environment side O and diffused. The fragile air permeability of the mouth non-woven fabric 16c is 100 to 800 cm ³ / cm ² · sec. It is preferable that it is 200-700 cm < ³ > / cm < ² > * sec. It is more preferable that it is 300-600 cm < ³ > / cm < ² > * sec. More preferably.

  As described above, the mouth non-woven fabric 16c is mainly a non-woven fabric that prevents the filtration non-woven fabric 16b from being damaged and imparts abrasion resistance to the mask, and does not impair the skin of the face and is excellent in skin contact. is there. Such a non-woven fabric having excellent wear resistance can be the same non-woven fabric as the outer non-woven fabric 16a, but for the same reason, it is preferably a non-woven fabric in which constituent fibers are fused, and the fibers are pressed together by pressing. Is more preferably a non-woven fabric in which the fibers are partially fused together by pressurization. More specifically, it is preferable that 3 to 50% of the area when assuming that the surface of the mouth nonwoven fabric 16c is a smooth plane is a nonwoven fabric partially fused with fibers, and 5 to 30%. It is more preferable that it is a nonwoven fabric partially fused with fibers, and 8 to 20% is still more preferably a nonwoven fabric partially fused with fibers.

  The fibers constituting the mouth nonwoven fabric 16c are not particularly limited, but may be regenerated fibers, semi-synthetic fibers, synthetic fibers, vegetable fibers, and / or animal fibers similar to the filtering nonwoven fabric 16b. As mentioned above, since it is preferably a non-woven fabric in which constituent fibers are fused, it preferably contains synthetic fibers, particularly thermoplastic synthetic fibers. In addition, it is preferable that the mouth nonwoven fabric 16c contains the fiber which has resin with low friction coefficients, such as a polyethylene resin, on the surface so that the friction to skin may be reduced and it may be excellent in skin contact property.

  Further, the fiber diameter of the fibers constituting the mouth non-woven fabric 16c is not particularly limited, but it is 10 to 40 μm so that the air permeability is high, the wear resistance is excellent, and the skin contact property is also excellent. It is preferable that it is 12-35 micrometers, and it is still more preferable that it is 15-30 micrometers. Further, the fiber length of the fibers constituting the mouth non-woven fabric 16c is not particularly limited, but is preferably composed of continuous fibers so that the fibers are less likely to fluff.

Furthermore, the basis weight of the mouth non-woven fabric 16c is not particularly limited, but is preferably 10 to 70 g / m ² in order to ensure wear resistance while suppressing a decrease in air permeability, and is preferably 12 to 50 g / m ^2. m ² is more preferable, and 15 to 30 g / m ² is even more preferable. The thickness of the mouth non-woven fabric 16c is not particularly limited, but is preferably 0.08 to 1.0 mm in consideration of processability while maintaining the shape retaining property of the mask. More preferably, it is -0.6mm, and it is still more preferable that it is 0.12-0.4mm.

  The above is an explanation of the laminated nonwoven fabric 16 in which the three nonwoven fabrics constituting the mask body 1 of the mask of FIG. 1 are laminated. FIG. 4 shows a cross-sectional view of the mask body 1 at B part in FIG. Thus, the low ventilation sheet 18 is provided in the laminated nonwoven fabric 16 further outside the outer nonwoven fabric 16a. The low ventilation sheet 18 has the nasal bridge side end portion, the left ear side end portion, and the right ear side end portion of the mask body 1 fused and fixed by the fusion portions 11b, (14a, 15a), (14c, 15b), respectively. Has been. Thus, since the jaw side end portion of the low ventilation sheet 18 is not fixed, when the mask body 1 is unfolded and a dome-shaped three-dimensional space is formed when the mask is worn, the jaw side end of the low ventilation sheet 18 is formed. A part protrudes to the external environment side O slightly, and a clearance gap is formed between the laminated nonwoven fabrics 16. Therefore, when the mask is worn, exhaled air that has passed through the laminated nonwoven fabric 16 corresponding to the location where the low ventilation sheet exists is discharged to the jaw side in the external environment by the low ventilation sheet 18. As a result, the discharged exhaled air does not go to the glasses side, and the discharged exhaled gas collides with the exhaled air that has passed through the laminated non-woven fabric 16 on the chin side from the low ventilation sheet existing location, and to the glasses side. Can be prevented more effectively, so that fogging of the glasses can be prevented more efficiently.

Such a low air permeability sheet 18 is not particularly limited as long as it has an air permeability that makes it difficult for exhalation to pass through, but the Frazier air permeability is 30 cm ³ / cm ² · sec. Or less, preferably 10 cm ³ / cm ² · sec. More preferably, it is 0 cm ³ / cm ² · sec. Most preferably.

  Examples of such a low air permeability sheet include a non-breathable film, a moisture permeable membrane, a nonwoven fabric, or a composite thereof (for example, a composite of a non-breathable film and a nonwoven fabric).

  Such a low ventilation sheet 18 is present in the mask main body 1 of FIG. 1 in the range from the fused portion 11b shown in FIG. 2 to the first valley fold 19a starting from the end of the nose bridge side. As described above, since the low ventilation sheet 18 does not exist in the region where the breath is mainly ventilated from the valley fold 19a to the fusion part 13, the breathing of the breath in the mask body 1 is inhibited, and the breath is kept inside the mask body. It is not likely that the glasses are cloudy by ventilating the gap between the face and the face (especially the nasal bridge).

  The pleated mask of FIG. 1 as described above can be manufactured by a conventional method. That is, after preparing the outer nonwoven fabric 16a, the filtration nonwoven fabric 16b, the mouth nonwoven fabric 16c, the low ventilation sheet 18, the adhesion member 11, the shape holding member 12, and the ear hook members 2a and 2b, the outer nonwoven fabric 16a, the filtration nonwoven fabric 16b, and the mouth nonwoven fabric. The laminated nonwoven fabric 16 laminated with 16c is folded by a conventional heat press method, a roller method, and the like, and the low ventilation sheet 18, the adhesion member 11, the shape holding member 12, and the ear hooking members 2a and 2b are formed at desired locations. In the arranged state, the fused portions 11a, 11b, 12a, 12b, 13, 14a, 14b, 14c, 14d, 15a, and 15b can be formed and manufactured by fusion processing using a conventional ultrasonic wave or the like. .

  The above is the description of the pleated mask in which the mask main body 1 of FIG. 1 is folded, but the present invention is not limited to the mask of FIG. Specifically, even in the following modified example, as long as the air permeability coefficient (Ca) is 50 to 200, the glasses are not easily clouded even in the environment where the temperature is low even without a shielding member. It is a mask that is difficult to block.

(A) The external shape of the mask body 1 of the mask of the present invention does not need to be rectangular. For example, the upper end part and lower end part of the left ear side end part of the mask main body 1 may have a barrel shape in which the upper end part and lower end part of the right ear side end part are chamfered or rounded.

(B) The mask body 1 only needs to contain a non-woven fabric, and may contain a fiber sheet other than the non-woven fabric (for example, woven fabric, knitted fabric, gauze, etc.). Moreover, the fiber which comprises a nonwoven fabric and a fiber sheet may contain the functional component. For example, the fibers constituting the nonwoven fabric and the fiber sheet are activated carbon having a deodorizing performance, essential oil (for example, camellia oil having moisturizing properties, mint oil having refreshing properties, etc.), antibacterial agent, catalyst such as titanium oxide, aromatic agent And so on. In addition, these functional components do not need to be contained in the fiber which comprises a nonwoven fabric and a fiber sheet, and can also be contained between fiber sheets, such as between fibers and a nonwoven fabric.

(C) The ear hooking members 2a and 2b do not need to be fixed to the upper end and lower end of the left ear side end of the mask body 1 and the upper and lower ends of the right ear side end. For example, the upper end portion and the lower end portion of the left ear side end portion, and the upper end portion and the lower end portion of the right ear side end portion may be fixed at the center portion.

(D) The mask body 1 does not need to be composed of three nonwoven fabrics. For example, you may be comprised from the nonwoven fabric of 1 sheet or 2 sheets or more. In addition, since each nonwoven fabric can have various functions such as filtration performance, skin contactability, and abrasion resistance when it is composed of two or more nonwoven fabrics, it can be a mask with excellent functionality, Is preferred.

(E) The nonwoven fabric does not need to have a uniform structure, and may have a non-uniform structure. For example, when a fiber web and a spunbond nonwoven fabric are entangled and integrated by needle punching or water flow, a non-uniform structure having a composite layer in which the fiber layer derived from the fiber web, the fiber web, and the spunbond nonwoven fabric are integrated. But can be used in the present invention.

(F) The mask main body 1 does not have to be a pleated type that is folded. For example, it may be a molding mask in which the mask body is molded, a flat mask similar to the gauze mask, or a folding mask in which a sheet-like nonwoven fabric is folded along the direction in which the nasal bridge extends. Further, as shown in FIG. 1, it is not necessary that the ridge lines of the mountain fold ridges 17a, 17b, and 17c extend so as to extend from the left ear side to the right ear side. It may be folded up so as to extend from the side toward the jaw side.

(G) The state of folding is not particularly limited. For example, the shape in the cut surface similar to FIG. 2 can be an Ω shape, a sawtooth shape, or a combination thereof (FIG. 1).

(H) The fused portions 11a, 11b, 12a, 12b, 13, 15a, and 15b do not have to be intermittently fused portions, and may be continuously stretched.

(Li) Instead of the fused portions 11a, 11b, 12a, 12b, 13, 14a, 14b, 14c, 14d, 15a, 15b, they may be bonded with an adhesive such as a hot melt resin, or stitched. May be.

(Nu) The close contact member 11 is not necessarily provided. However, it is preferable that the contact member 11 is provided so that the adhesion between the mask body 1 and the face when the mask is worn can be improved. The contact member 11 does not have to be flat, and may have a circular cross section, for example.

(L) The shape holding member 12 is not necessarily provided. Further, the shape holding member 12 does not have to be flat, and may have a circular cross section, for example.

(V) The ear hooking members 2a and 2b do not need to be fixed by fusion, and may be bonded by an adhesive such as hot melt resin or may be sewn.

(W) It is not always necessary to provide the low ventilation sheet 18. Even if it is provided, only one side of the nose bridge side end portion of the low ventilation sheet 18 may be fused and fixed by the fused portion 11b at the nose bridge side end portion of the mask body 1. Further, the low ventilation sheet 18 does not need to be disposed further outside than the outer nonwoven fabric 16a, and may be disposed further to the mouth side than the mouth nonwoven fabric 16c, or between the outer nonwoven fabric 16a and the filtration nonwoven fabric 16b. Further, it may be disposed between the nonwoven fabrics, such as between the filtered nonwoven fabric 16b and the mouth nonwoven fabric 16c.

  Examples of the present invention will be described below, but the present invention is not limited to the following examples.

(Preparation of spunbond nonwoven fabric A)
Spunbond non-woven fabric A (partial weight: 20 g / m ² , thickness: 0.22 mm, air permeability: 415 cm ³ / cm ² · sec.), Fiber diameter: 21 μm, continuous fiber, made of polypropylene fiber and partially fused Fusion area: 11%) was prepared.

(Preparation of spunbond nonwoven fabric B)
Spunbond nonwoven fabric B (core weight: 15 g / m ² , thickness: 0.12 mm, air permeability: made of a core-sheath type composite fiber having a core made of polypropylene resin and a sheath made of polyethylene resin, and the sheath component is partially fused. 523 cm ³ / cm ² · sec., Fiber diameter: 21 μm, continuous fiber, fusion area: 11%).

(Preparation of spunbond nonwoven fabric C)
Spunbond nonwoven fabric C made of polypropylene fiber and partially fused (weight: 15 g / m ² , thickness: 0.16 mm, air permeability: 750 cm ³ / cm ² · sec., Fiber diameter: 28 μm, continuous fiber, Fusion area: 22%) was prepared.

(Preparation of spunbond nonwoven fabric D)
Spunbond nonwoven fabric D made of polyolefin fiber and partially fused (weight: 25 g / m ² , thickness: 0.26 mm, air permeability: 280 cm ³ / cm ² · sec., Fiber diameter: 20 μm, continuous fiber, Fusion area: 16%) was prepared.

(Preparation of spunbond nonwoven fabric E)
Spunbond nonwoven fabric E made of polyolefin fiber and partially fused (weight per unit: 25 g / m ² , thickness: 0.23 mm, air permeability: 310 cm ³ / cm ² · sec., Fiber diameter: 25 μm, continuous fiber, Fusion area: 10%) was prepared.

(Preparation of charged melt blown nonwoven fabric A)
A melt-blown nonwoven fabric A made of polyolefin fibers (weight per unit: 30 g / m ² , thickness: 0.16 mm, air permeability: 36 cm ³ / cm ² · sec.) Is prepared, and the melt-blown nonwoven fabric A is subjected to a charging process by corona discharge. A charged melt blown nonwoven fabric A was obtained.

(Preparation of charged non-woven fabric)
40% by mass of polypropylene short fiber (fineness: 2.2 dtex, fiber diameter: 18 μm, fiber length: 51 mm) and 60% by mass of acrylic short fiber (fineness: 2.2 dtex, fiber diameter: 15 μm, fiber length: 51 mm) The fiber web was opened by a card machine to form a fiber web, and then laminated on the spunbonded nonwoven fabric C to obtain a laminated fiber web.

Subsequently, the laminated fiber web was entangled with a crossbarb needle having a needle count of 40 at a needle depth of 16 mm and a needle density of 34 needles / cm ² , and the basis weight was 80 g / m ^2. Of 1.4 mm was manufactured (air permeability: 215 cm ³ / cm ² · sec, collection efficiency: 97%). This charged non-woven fabric was a non-woven fabric charged by friction at the time of producing a fiber web by opening with a card machine and at the time of needle punching.

(Low ventilation composite sheet)
A low-breathing composite sheet in which a polyethylene film is laminated on a polypropylene nonwoven fabric as a low-breathing sheet (Fragile air permeability: 1 cm ³ / cm ² · sec. Or less, length: 172 mm, width: 35 mm, thickness: 0.15 mm, basis weight : 20 g / m ² ) was prepared.

(Adhering member)
As the adhesion member, a string-like polyethylene resin having a length of 85 mm (cross section: rectangular shape having a width of 4 mm and a thickness of 0.6 mm) was prepared.

(Shape retaining member)
As the shape holding member, a string-like polypropylene resin having a length of 140 mm (cross section: rectangular shape having a width of 4 mm and a thickness of 0.6 mm) was prepared.

(Ear hook member)
As the ear-hook member, a string (cross section: rectangular shape having a width of 3 mm and a thickness of 1.5 mm) made of polyester fiber and polyurethane fiber having a length of 17 cm was prepared.

(Examples 1-5, Comparative Examples 1-4)
As shown in Table 1, the laminated nonwoven fabric 16 in which the outer nonwoven fabric 16a, the filtration nonwoven fabric 16b, and the mouth nonwoven fabric 16c are laminated, as shown in FIG. 6, is folded, and the adhesion member 11, the shape retaining member 12, and the ear hooking member 2a 2b, a low-breathing composite sheet 18 is disposed, and fused portions 11a, 11b, 12a, 12b, 13, 14a, 14b, 14c, 14d, 15a, and 15b have the dimensions shown in FIG. And a rectangular pleated mask [length in the (nasal bridge-jaw) direction: 88 mm, length in the (right ear-left ear) direction: 172 mm] was manufactured. Regarding the ear hooking members 2a and 2b, the stress at the time of extension shown in Table 1 was obtained by changing the fusion position of the ear hooking members 2a and 2b and adjusting the length thereof.

(Evaluation of cloudy glasses and wearing feeling)
The visual acuity test was performed according to the following procedure.
(1) In a constant temperature and humidity chamber set at a temperature of 4 ° C. and a relative humidity of 70%, a visual acuity test using a Landolt ring is performed in a state where glasses are not worn, and a position where the visual acuity becomes 1.0 is determined.
(2) After wearing the masks of Examples 1 to 5 or Comparative Examples 1 to 4, wearing glasses (safety goggles) and taking deep breaths three times.
(3) A visual acuity test using a Landolt ring is performed at a position where the visual acuity of (1) is 1.0.
(4) The visual acuity test of (1) to (3) is performed for three persons, the result of the visual acuity test after wearing glasses is arithmetically averaged, and the second decimal place is rounded off.

  Due to the deep breathing of (2), the glasses easily become cloudy due to exhalation, and the visual field is poor, and the visual acuity tends to decrease. Therefore, the ease of clouding of the glasses with the mask was evaluated from the arithmetically averaged visual acuity of (4).

  In addition to the visual acuity test, sensory evaluation by three subjects was performed, the sensory evaluation results were arithmetically averaged, and the second decimal place was rounded off to evaluate the ease of fogging of the glasses with the mask. In addition, sensory evaluation was made into five grades which evaluate the case where it is easily cloudy as "5", and the case where cloudiness is difficult as "1".

  Furthermore, the sensory evaluation by three subjects was performed on the feeling of wearing the mask during the visual acuity test, the sensory evaluation results were arithmetically averaged, and the second decimal place was rounded off to evaluate the feeling of wearing the mask. The sensory evaluation was based on the following criteria.

1: Although there is no burden on the ear, the mask does not adhere to the face, and the user feels uneasy about the mask performance. 2: Although there is no burden on the ear, there is a slight anxiety about the adhesion between the mask and the face. It adheres to the face and can be worn comfortably without any strain on the ears. 4: Although the mask adheres closely to the face, it feels a little burden on the ears. 5: Although the mask adheres closely to the face, the burden on the ears is large. Unbearable

  These results were as shown in Table 1. From a comparison between Examples 1 to 5 and Comparative Examples 1 to 4, it was found that a mask having an air permeability coefficient of 50 to 200 is a mask that is less likely to fog up and has excellent wearing feeling.

  Moreover, it was found from comparison between Examples 1 to 3 and Examples 4 to 5 that the air permeability coefficient was 60 to 150, in addition to the mask not being easily fogged, and being more comfortable to wear.

  The mask of the present invention does not have a shielding member, and even when worn when the temperature is low, the mask is less likely to fog up and obstruct the field of view. In particular, it is a pleated mask that does not obstruct the field of view.

DESCRIPTION OF SYMBOLS 1 Mask main body 11 Contact | adherence member 12 Shape holding member 11a, 11b, 12a, 12b, 13, 14a, 14b, 14c, 14d, 15a, 15b Fusion part 16 Laminated nonwoven fabric 16a Outer nonwoven fabric 16b Filtration nonwoven fabric 16c Mouth nonwoven fabric 17a, 17b, 17c Mountain crease 18 Low ventilation sheet 19a, 19b, 19c Valley crease 2a, 2b Ear hook member C Chuck F Cylindrical hook O External environment side I Mouth side

Claims (5)

A mask having a mask main body including a nonwoven fabric and an ear hooking member capable of fixing the mask main body to an ear, and having a ventilation coefficient (Ca) calculated from the following formula of 50 to 200.
Ca = Ap × Se
Here, Ap means the air permeability of the mask body (unit: cm ³ / cm ² · sec.), And Se means the stress (unit: N) when the ear hook member is elongated by 95 mm. The air permeability of the mask body is 50 cm ³ / cm ² · sec. The mask according to claim 1, which is as described above. The mask according to claim 1, wherein the non-woven fabric constituting the mask body includes a charged non-woven fabric. The mask according to any one of claims 1 to 3, wherein the mask body is made of two or more nonwoven fabrics. The mask according to claim 1, wherein the mask body is a pleated mask in which the mask body is folded.

Images