JP2015181751A - mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mask that can surely prevent a glass lens from fogging up due to leak of wet breath, by completely eliminating a gap between the face and the mask.SOLUTION: A nose piece having plastic deformability is prepared along the upper edge part of a mask body of a prescribed shape. Also, near the nose piece, there is joined to the mask body a sheet-like breath cut-off material which is long rectangular shaped, soft and resilient. Means is adopted for cutting off the breath by folding the free end part of the material inwardly so as to cover the nose piece and by fitting it to the face using the resilience.

Description

  The present invention relates to a mask that prevents fogging of a spectacle lens that occurs when a mask is worn with glasses.

  Conventionally, a mask is used for removing germs and viruses that become pathogenic bacteria, removing pollen and house dust that cause allergies, and removing dust at the outdoors and work sites. However, when used with glasses, the eyeglass lens becomes cloudy due to the wet exhalation that leaks from between the nose and the mask, deteriorating the field of view. Therefore, in order to prevent fogging of the spectacle lens, a thin film piece or cushioning material is attached horizontally along the upper inner surface of the mask body, and in combination with a nosepiece (metal thin plate) that is plastically deformed to improve fit. Proposals have been made to prevent exhalation from leaking between the nose and the mask.

  Specifically, for example, as described in Patent Document 1, a horizontally long rectangular cushioning material aiming to improve the fit between a face and a mask, and a nose piece made of a thin metal plate are stacked directly below the cushioning material. In addition, it has been proposed to reduce the gap between the face and the mask to prevent fogging of the spectacle lens due to exhalation. However, with a square cushioning material having a uniform cross section, it is difficult to adhere to various different faces, and even if it is suppressed with a nose piece, it is difficult to improve the fit to the face from the resilience of the cushioning material. For this reason, during use, the gap between the face and the mask was widened to cause fogging of the spectacle lens due to moist exhalation.

  Further, as described in Patent Document 2, a defogging mask is proposed in which a thin film piece such as a symmetrical nylon fiber or polyester fiber fabric is attached to the inner upper edge of the mask body with a central axis interposed therebetween. . However, since the thin film piece is separated at the center, the resilience is weak and the fit to the face is insufficient. This dampened the exhaled breath and clouded the spectacle lens.

  In addition, as described in Patent Document 3, a cushioning material having chevron irregularities matched to the shape of the nose is attached to the upper part of the inner surface of the mask body to fill the gap between the face and the mask, thereby improving the fit and improving the gap. Attempts have been made to reduce this. However, this mode is also difficult to follow along many different noses and faces only with the form and elasticity of the cushioning material, and it has not yet been possible to prevent the spectacle lens from being fogged by generating a gap.

  Further, Patent Document 4 is an invention designed so that a folded portion provided so as to protrude inward from the surface layer portion of the mask body fits the nose or the face, but the soft surface layer material of the mask body is formed in the folded portion. Since it is used, it does not provide sufficient resilience and cannot follow complicated facial features. For this reason, a gap was formed between the mask and the face, and the moist exhalation could not be blocked, resulting in clouding of the spectacle lens.

  Patent Document 5 discloses that a mask body has a thin rectangular outer base portion and an elastic bent piece portion extending from the outer base portion, and the elastic bent portion is bent inward of the mask. Propose to improve the fit. However, in this method, the bending angle is not sufficient and appropriate repulsion cannot be obtained, and the complicated curved surface shape of the face cannot be followed, so that a gap is formed between the face and the elastic bent portion. For this reason, the spectacle lens is clouded by passing the moist exhalation.

  As described above, any of the prior art examples cannot completely achieve its purpose as a mask in which the spectacle lens is not fogged.

Japanese Utility Model Publication No. 6-15648 Registered Utility Model Publication No. 3114559 JP 2008-148984 A JP 2009-11709 A JP 2009-66382 A

  The present invention has been made in order to solve the above-described problems that various masks cannot achieve, and eliminates a gap generated between the face and the mask completely, resulting in leakage of moist exhalation. An object of the present invention is to provide a mask that can reliably prevent fogging of an eyeglass lens.

  In order to solve the above problems, the present invention provides a nose piece having plastic deformability along the upper edge of a mask body of a predetermined shape, and is flexible and repulsive in a horizontally long rectangular shape in the vicinity of the nose piece. The sheet-shaped exhalation-blocking material is joined to the mask body, and the free end portion is folded inward so as to cover the nosepiece, and the rebound is fitted to the face to block exhalation.

  According to such a configuration, the sheet-shaped exhalation-blocking material attached to the inner surface of the upper end of the mask main body has moderate resilience to be bent back to the inside of the mask and returned to its original state, and flexibility due to the material. Deforms along the face when worn. Further, since the sheet-like exhalation-blocking material is held by being fitted to the face, the gap between the face and the mask is completely disappeared by restraining with a nose piece having a large plastic deformation. For this reason, since the gap between the mask body and the face can be completely closed, the moist exhalation does not leak and reach the spectacle lens and is not clouded.

  And the mask main body employ | adopted the means that it joins the left-right paired base material by the curvilinear joining part, and was three-dimensionalized.

  Moreover, the means that the sheet-like breath blocking material is a non-foamed sheet or a foamed sheet was adopted.

  That is, a flexible and repulsive material is adopted.

  Moreover, the nose piece employ | adopted the means that it is arrange | positioned in the lower stage from the junction part of the said sheet-like exhalation | blocking breathing material, or overlapping this.

  Since the fit to the face differs depending on the arrangement position of the nosepiece, an appropriate position is selected in combination with the property of the sheet-type exhalation-blocking material.

  Furthermore, the joining part of a mask main body and a sheet-like exhalation-blocking material employ | adopts the means of joining with either a double-sided tape, a welder method, or an adhesive agent.

  In other words, an appropriate joining means is selected according to the characteristics of the material.

  Further, in place of this joining means, means for allowing the sheet-like exhalation blocking material to be detachable was adopted.

  Specifically, the sheet-shaped exhalation-blocking material is a composite in which a hook-and-loop fastener is provided along the lower side portion of the back surface, and a hook-and-loop fastener is provided at both corners on the upper surface. The joining part employ | adopted the means of making it removable with a hook-and-loop fastener.

  And in the said composite_body | complex, the means of providing a nose piece in piles in the shielding material junction part was employ | adopted.

  Such a composite is detachable to prevent fogging of the spectacle lens in correspondence with various commercially available masks.

  Moreover, the means of joining the both ends of the folded free end part of the said sheet-like exhalation-blocking material to the inner surface of the mask main body via a joint part was employ | adopted.

  And the means of joining the center part of a free end part to the inner surface of a mask main body further through the junction part was employ | adopted.

  Thereby, a symmetrical curved surface is formed on the sheet-like exhalation-blocking material, and the fit to the face is improved.

  The mask according to the present invention having the above-described configuration is provided with a sheet-like breath blocking material on the upper edge of the mask main body so that it fits the face, so that when the mask is worn, the gap between the face and the mask is completely The moist exhalation never reaches the eyeglass lens. In particular, even in harsh environments such as winter, the cold lens does not condense and does not disturb the field of view. In addition, the front field of view can be secured without being clouded even when used for a long time.

  Moreover, since it can respond regardless of the shape of the mask, the application range is wide.

  Furthermore, it is the outstanding invention which can respond also to various commercially available masks by making a sheet-like exhalation-blocking material removable.

  And by joining the both ends and center part of the free end part of a sheet-like exhalation-blocking material, a left-right symmetrical curved surface is formed, the fitting property to a face improves, and the leak of exhalation is prevented reliably. Therefore, fogging of the spectacle lens can be reliably prevented.

It is explanatory drawing which showed a mode that the mask based on this invention was mounted | worn on the face. It is an explanatory perspective view showing one embodiment of a mask concerning the present invention. It is an explanatory back view showing one embodiment of a mask concerning the present invention. It is explanatory drawing which shows the aspect which joins a sheet-like exhalation-blocking material to a mask main body. It is an explanatory back view showing other embodiments of the mask concerning the present invention. FIG. 6 is an explanatory side view of the mask shown in FIG. 5. It is explanatory drawing of the manufacture process which joins a sheet-like exhalation-blocking material to a mask main body. It is an explanatory back view showing other embodiments of the mask concerning the present invention. It is explanatory drawing which shows the removable sheet-like exhalation | blocking material. It is explanatory drawing which shows the example of a mechanical adhesion part.

  Hereinafter, several preferred embodiments of the mask according to the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a state in which a mask 1 of the present invention is mounted on a face wearing glasses.

(First embodiment)
FIG. 2 is an explanatory perspective view showing the first embodiment of the present invention. The mask 1 is a so-called three-dimensional mask, and is a mask body 2 composed of a pair of left and right substrates, and a sheet provided on the upper edge of the mask body 2. It comprises a nosepiece 4 provided in the vicinity of the sheet-like exhalation-blocking material 3 and the elastic cords 5 and 5 for hooking ears. The joint portion 6 is a portion where base materials constituting the mask body 2 are joined together. The joint 6 is joined in a curved shape in order to make the mask body 2 three-dimensional. A part of the upper part of the joint part 6 constitutes a bent part 8 made of left and right isomorphic parts, and this part is not joined. The blocking material joint portion 7 indicates a portion where the upper end portion of the mask body 2 and the sheet-like exhalation blocking material 3 are joined on the inner side surface portion of the mask body 2. The free end portion of the sheet-like exhalation-blocking material 3 that is not joined is folded back so as to cover the nosepiece 4. In addition, even if the interruption | blocking material junction part 7 is a little inside from the upper end part of the mask main body 2, this invention is not prevented. The stretchable string bonding portion 9 is a portion where the stretchable strings 5 and 5 are bonded to both sides of the mask main body 2. The nosepiece 4 is joined and installed adjacent to the blocking material joint 7 on the inner side surface portion of the mask body 2. With this configuration, the sheet-shaped exhalation-blocking material 3 repels the face side and fits to the face, effectively blocking exhalation.

  FIG. 3 is a rear view of the mask 1 shown in FIG. A sheet-shaped exhalation-blocking material 3 is bonded at the blocking material bonding portion 7 along the upper end portion of the three-dimensional mask main body 2 so as to cover the nosepiece 4. The bent portion 8 is a portion obtained by bending a part of the mask body 2 to form a three-dimensional shape.

  FIGS. 4A to 4G show an enlarged example of a joining relationship with the mask body 2, the sheet-like exhalation-blocking material 3, and the nose piece 4 in a side view. Among these, FIGS. 4A to 4C show an example of a method of joining the sheet-shaped exhalation-blocking material 3 to the mask body 2. (A) is obtained by bending the upper edge portion of the surface of the sheet-like breath blocking material 3 in a step shape and joining it to the upper side portion of the mask body 2 and extending it downward as it is. (B) joins the upper end edge of the sheet-like exhalation-blocking material 3 to the upper side part of the mask main body 2 at a right angle, and bend | folds down in the middle. (C) is obtained by folding the sheet-shaped exhalation-blocking material 3 twice and joining the edge of the back surface to the upper end of the mask body 2. The resilience to the face side of the sheet-type exhalation-blocking material 3 differs depending on these joining methods. The resilience increases in the order of (a), (b), and (c) depending on the bending angle. In order to improve the fit to the face, it is preferable to bend it to around 140 to 180 degrees as shown in (c). In addition, the specific joining method of the sheet-like exhalation-blocking material 3 to the mask body 2 is appropriately selected according to the original hardness, thickness, width, and length of the sheet-like exhalation-blocking material 3.

  Next, as shown in FIGS. 4A to 4G, the nosepiece 4 is disposed in the vicinity of the sheet-like exhalation-blocking material. For example, as shown in (a) to (c), the sheet-like exhalation-blocking material 3 is placed adjacent to the lower stage. Further, in (d), the sheet-like exhalation-blocking material 3 is placed over the blocking-material joining portion 7. This position is close to the sheet-like exhalation-blocking material 3 and easily transmits the deformation effect. In (e), it is easy to convey the deformation in an example in which the sheet-like exhalation-blocking material 3 is placed on the folded inner surface. (F) is an example in which the mask main body 2 is placed in the laminated constituent material. (G) is an example in which the sheet-shaped exhalation-blocking material 3 is placed on the nosepiece 4. In order to effectively impart the deformability by the nosepiece 4, the sheet-shaped exhalation-blocking material 3 is joined in a double-folded manner as shown in FIG. Can be combined with the upper end of the mask body 2, there are combinations (c) to (g). It is also possible to attach a plurality of nose pieces.

  The gap 10 adjacent to the sheet-shaped exhalation-blocking material 3 and the nosepiece 4 is an important factor for the resilience of the sheet-shaped exhalation-blocking material 3. The gap 10 is normally set to 0 to 8 mm. If the gap is narrow, the resilience of the sheet-type exhalation-blocking material 3 is increased. If the gap is too large, the resilience is insufficient. The bending resistance of the sheet-shaped exhalation-blocking material 3 is preferably 70 to 300 mm by a cantilever method according to JIS L1906. In order to adjust the resilience of the sheet-shaped exhalation-blocking material 3, both ends or the center of the sheet-shaped exhalation-blocking material 3, or both of them may be partially joined to the mask body 2.

  The constituent material of the mask body 2 is a breathable nonwoven fabric or woven or knitted fabric. Preferably they are laminated according to the requirements for dust removal performance. The laminated material is a nonwoven fabric or knitted fabric of natural fibers or synthetic fibers. In order to improve dust removal performance with low pressure loss and high collection, electret non-woven fabric, nanofiber non-woven fabric, and hygroscopic materials and processing are used in combination to improve anti-fogging effect. Hygroscopic cotton gauze is one of the preferred laminate materials.

  Note that the three-dimensional mask which is an example of the present invention has various shapes. The component parts are 1 piece, 2 pieces, 3 pieces or more according to the shape. The mask 1 of the present invention shown in FIG. 2 is an example of a one-piece type.

  The material of the sheet-like exhalation-blocking material 3 can be used as long as it is a flexible and repulsive material. The shape of the sheet-shaped exhalation-blocking material 3 is usually a horizontally long rectangle, but is not limited to this, and various shapes are used from the viewpoint of resilience and fit. For example, the shape shown in FIG. 3 is a trapezoidal shape in which both ends of a rectangle are cut off obliquely. Since it is a sheet shape, the thickness is thinner than the width and length. Depending on the hardness of the material, a normal thickness of 0.5-6 mm is used. As a material, in particular, a foam sheet is preferable in terms of fit and elasticity. In addition, the length of the sheet-shaped exhalation-blocking material 3 is preferably half or more of the lateral width of the mask body 2 in view of exhalation-blocking properties. Further, the sheet width including the blocking material joining portion 7 is preferably 10 to 40 mm as the sheet-shaped exhalation blocking material 3. If the sheet width is too large, the contact area with the face increases, which causes discomfort. In addition, when the seat width is narrow, the resilience is increased, the fit to the face is insufficient, and the spectacle lens is clouded due to leakage of exhalation.

  As a material for the sheet-like breath blocking material 3, a normal non-foamed sheet or foamed sheet is selected from flexibility, resilience, lightness, and the like. Polyethylene, urethane, EPDM foam (ethylene propylene diene rubber), cellulose sponge, natural rubber, synthetic rubber and the like are preferable from the required characteristics and safety to the skin. In particular, these foam sheets have favorable properties from the viewpoint of fit. Since the flexibility and resilience necessary for the sheet-like exhalation-blocking material 3 are determined by the material, thickness, width, and length, it is necessary to select an appropriate one. The expansion ratio is also an important factor. As preferable values, as described above, the thickness is 0.5 to 6 mm, the width is 10 to 40 mm, and the length is 50 to 180 mm.

  The nosepiece 4 has an important role as a support material for fitting the sheet-shaped exhalation-blocking material 3 to various human faces, and is selected according to the properties of the sheet-shaped exhalation-blocking material 3. As the material, a thin and elongated metal material or plastic material is used. Any one having plastic deformability is preferable. As the metal, iron, aluminum, an alloy material, or the like is used. As the plastic material, polyethylene, polyisobrene, polyurethane, styrene / butadiene, paper, or the like is used. The thickness and width of the nosepiece 4 are combined in accordance with the plastic deformability of the material and the characteristics of the sheet-like breath blocking material 3. The thickness, width, and length of the nosepiece 4 exhibit preferable characteristics with a thickness of 0.2 to 1.2 mm, a width of 3 to 12 mm, and a length of 40 to 150 mm. Further, even if the nosepiece 4 is provided separately on the left and right sides of the mask center, the present invention is not hindered.

  The elastic string 5 can be made of general rubber, polyurethane and natural fiber, a composite string of chemical fiber, non-woven fabric, or the like. Select an appropriate stretchable material, thickness, and mixing ratio that will not be tightened because it will be worn on the ear.

  The blocking material joint 7 between the sheet-shaped exhalation blocking material 3 and the upper side of the mask body 2 is bonded using a double-sided tape, a welder method, an adhesive, mechanical bonding, or the like. The joining width is preferably 4 to 20 mm. If the bonding strength between the two is weak, primer bonding can be performed to increase the bonding strength. Although the nosepiece 4 is preferably in direct contact with the sheet-shaped blocking material 3 from the viewpoint of imparting formability, the purpose is impaired even if the nosepiece 4 is covered with an appropriate cover material for reasons such as safety and cushioning properties. Not a thing.

(Second Embodiment)
FIG. 5 is a second embodiment of the mask according to the present invention, and shows the back surface of the mask 1 having the form of a two-dimensional flat mask. The sheet-type exhalation-blocking material 3 is bonded to the upper side portion of the mask body 2 having pleats at the blocking-material bonding portion 7, and the non-bonded portion is installed so as to cover the nosepiece 4. For this reason, when wearing on the face, the sheet-shaped exhalation-blocking material 3 is suppressed by the nosepiece 4 so as to fit the face so that there is no gap between the face and the sheet-shaped exhalation-blocking material 3 so that exhalation does not flow to the spectacle lens. To. The stretchable string joining portion 9 indicates a place where the stretchable strings 5, 5 and the mask body 2 are joined.

  FIG. 6 is a side view of the mask 1 of the flat mask of FIG. The sheet-like exhalation-blocking material 3 is bonded to the upper side portion of the mask body 2 having pleats by a blocking material bonding portion 7, and the non-bonded portion is disposed so as to cover the nosepiece 4. The joining method of the sheet-like blocking material 3 and the nosepiece 4 is placed on the blocking material joining portion 7 of the sheet-like breath blocking material 3 as shown in FIG.

  FIG. 7 shows a manufacturing process of the mask 1 shown in FIGS. The state which joined a part of sheet-like exhalation-blocking material 3 to the back upper side part of the mask main body 2 is shown. First, one of the long sides of the sheet-type exhalation-blocking material 3 is bonded to the mask body 2 via the blocking material bonding portion 7, and the nose piece 4 is provided so as to overlap with the blocking material bonding portion 7. When the sheet-like exhalation-blocking material 3 is bent from the above state to the inner surface so as to cover the adjacent nosepiece 4, the mask shown in FIG. 6 is obtained. The shape of the sheet-type exhalation-blocking material 3 is mainly an elongated rectangle, for example, a concave portion is formed in the center portion along the nose shape, and left and right portions thereof are convex portions. Select appropriately considering the relationship.

(Third embodiment)
FIG. 8 is a third embodiment in which the flat mask according to the second embodiment of the present invention is deformed, and is a mask 1 having excellent fit to the face. Similarly to the previous example, a part of the sheet-type exhalation-blocking material 3 is bonded to the upper side portion of the mask body 2 by the blocking material bonding portion 7 and is folded and attached so as to cover the nosepiece 4. The stretchable cord 5 is joined to the mask body 2 at the left and right by the stretchable cord joint 9. The feature of this embodiment is that both ends of the lower side portion of the mask body 2 are folded and joined to the inner side portion of the lower side portion of the mask body 2 by the joint portion 11. The folding side from the lower side edge of the mask body 2 to the joint 11 is set to 12. Thereby, the lower part of the mask main body 2 becomes a three-dimensional shape, and the fitting property to a jaw is improved. Further, a cut portion 15 is formed by obliquely cutting off both ends of the upper side of the mask body 2 in order to improve the fit to the face.

  Further, in order to further improve the fit, the mask body 2 and the lower end portion of the sheet-like exhalation-blocking material 3 are point-joined at the joint portion 13. In some cases, the central portion of the sheet-shaped exhalation-blocking material 3 and the mask main body 2 can be point-joined at the central joint portion 14. Thereby, the sheet-like exhalation-blocking material 3 can have a right and left symmetrical curved surface and improve the fit to the face. In addition, although the pleat form of the mask main body 2 does not ask | require, what made the omega shape shown in FIG.

(Other variations)
Subsequently, FIG. 9 shows the composite 18 formed by detachably attaching the sheet-shaped exhalation-blocking material 3 to the mask body by mechanical adhesion. (A) is the front view, (b) is a plan view. The composite 18 is provided with a mechanical adhesive 16 along the lower end side of the back surface of the sheet-shaped exhalation-blocking material 3 having a predetermined shape, and mechanical adhesives 17 and 17 at both upper corners of the surface. is there. Moreover, the nosepiece 4 is provided along the lower end side of the surface. The composite 18 is joined to the upper end of the inner surface of the mask body 2 so that the mechanical adhesive 16 is formed as in the manufacturing process shown in FIG. Is bent inward so as to cover, and the mechanical adhesive 17 at both ends is joined to the surface of the mask body. Thereby, for example, a mask equivalent to the mask 1 of the flat mask as shown in FIG. 5 can be formed.

  A typical example of the mechanical adhesives 16 and 17 is a hook-and-loop fastener. As shown in FIGS. 10A and 10B, the surface of the mask body 2 is formed by a large number of convex protrusions 19 formed of plastic. The fibers 20 to be entangled and joined. Or what is comprised with the loop-shaped fiber 21 is entangled with the fiber 20 which forms the surface of the mask main body 2, and is joined. These mechanical adhesives 16 and 17 are securely bonded to the sheet-like breath blocking material 3 with an adhesive or the like.

  Thus, since the sheet-like exhalation-blocking material 3 having a mechanically bonded portion is detachable, it can be applied to other commercially available masks for the purpose of preventing fogging. In addition, although what joined the nosepiece 4 to the sheet-like exhalation-blocking material 3 was illustrated in FIG. 9, if the nosepiece 4 is previously installed in the mask main body 2, it will not disturb this invention. In addition, it is possible to attach mechanically and detachably not only to a flat mask but also to a three-dimensional mask. When the flat mask is worn, it is folded at the center in the mask length direction, and the sheet-like exhalation-blocking material 3 is folded and worn to improve the fit.

  Hereinafter, the technical effects of the present invention will be demonstrated with reference to some examples of the present invention.

In the mask 1 shown in FIG. 2 of the present invention, the constituent material of the mask main body 2 is a spunbond nonwoven fabric having a basis weight of 38 g / m ² on the first layer, an electret meltblown nonwoven fabric having a basis weight of 20 g / m ² , and a third layer. A spunbond nonwoven fabric having a basis weight of 20 g / m ² was laminated and used. In either case, the material is polypropylene fiber. As shown in FIG. 2, the three-dimensional shape of the mask main body 2 is formed by joining left-right symmetric parts at the joint 6 and bending at the bent portion 8 in order to make the constituent material three-dimensional. Ultrasonic bonding was used for this joining. The sheet-shaped breath blocking material 3 is a closed cell polyethylene foam sheet having a thickness of 3 mm, an apparent density of 15 kg / m ³ , and a bending resistance of 240 mm. The shape is rectangular as shown in FIG. It is cut into pieces. The lower side portion of the sheet-shaped exhalation-blocking material 3 is joined to the upper end portion of the mask main body 2 with an adhesive at the blocking-material joining portion 7 shown in FIG. The method shown in FIG. 4C was used as the bonding method, and the bonding width was 5 mm.

  As the nosepiece 4, as shown in FIG. 3, a polyethylene thin plate having a plastic deformability having a thickness of 0.8 mm, a width of 4 mm, and a length of 100 mm was used. The nosepiece 4 was joined to the back surface of the mask body 2 so as to be adjacent to the sheet-like exhalation-blocking material 3 with a gap of 0.3 mm. As shown in FIG. 3, the stretchable cord 5 is joined to the back surface of the mask body 2 at two places on the left and right sides by the stretchable cord joining portion 9.

  The sheet-type exhalation-blocking material 3 was set so as to cover the nosepiece 4 by being folded inside the back surface of the mask body 2 with the gap between the sheet-shaped exhalation-blocking material 3 and the nosepiece 4 as a boundary. By this bending, the sheet-shaped exhalation-blocking material 3 exhibits an appropriate resilience and can fit the face and close the gap. In addition, the nosepiece deformation support has made perfect fit.

  After wearing the three-dimensional mask 1, the glasses were cooled in a refrigerator at 5 degrees Celsius for 2 minutes. Then, it was taken out and installed in a room at 23 degrees Celsius to evaluate the haze. As a result, cloudiness of the glasses due to exhalation after wearing was not recognized. Moreover, although the mask 1 was worn for 2 hours per day at an external temperature of 8 degrees Celsius, no obstacle to work due to cloudy glasses was found.

In the mask 1 having the flat mask shape shown in FIG. 5 of the present invention, the constituent material of the mask body 2 is an electret meltblown nonwoven fabric having a basis weight of 20 g / m ² spunbond nonwoven fabric and a second layer of 20 g / m ² , A spunbonded non-woven fabric having a fabric gauze basis weight of 56 g / m ² and a fourth layer having a basis weight of 20 g / m ² was laminated on the third layer. In any case, the material is polypropylene fiber except for the third layer. The size of the flat mask is a rectangle having a length of 175 mm and a width of 90 mm. The pleat form of the flat mask has an omega structure as shown in FIG.

The sheet-shaped breath blocking material 3 is an open-cell polyethylene vinyl acetate copolymer foam sheet having a thickness of 3 mm, an apparent density of 29 kg / m ³ , and a bending resistance of 110 mm. The shape is rectangular as shown in FIG. The width is 30 mm and both ends are cut obliquely. As shown in FIG. 7, a part of the sheet-shaped exhalation-blocking material 3 is joined to the upper end portion of the mask body 2 by a blocking material joining portion 7 with a width of 10 mm. The joining method used was the method shown in FIG. Double-sided adhesive tape was used for joining.

  As the nosepiece 4, as shown in FIG. 5, an aluminum thin plate having a plastic deformability with a thickness of 0.8 mm, a width of 6 mm, and a length of 110 mm was used. The nosepiece 4 was joined to the mask body 2 with a double-sided adhesive tape so as to be adjacent to the sheet-like breath blocking material 3. The joining method used was the method shown in FIG. The gap between the sheet-shaped exhalation-blocking material 3 and the nose piece was 0.1 mm. As shown in FIG. 5, the elastic cord 5 was joined to the back surface of the mask main body 2 at two places on the left and right sides by the elastic cord joining portion 9.

  As shown in FIG. 6, the nosepiece 4 was set so as to be bent inside the back surface of the mask body 2 with the upper end of the blocking material joint portion 7 of the sheet-type exhalation blocking material 3 as a boundary. Thus, since the sheet-like exhalation-blocking material 3 is bent, it fits to the face with moderate resilience. In addition, the fit was reinforced with a nosepiece.

  After wearing the mask 1 in the shape of the flat mask, the glasses were cooled in a refrigerator at 5 degrees Celsius for 2 minutes and then taken out into a room at 23 degrees Celsius and attached to evaluate the haze. As a result, fogging of the glasses after wearing was not recognized. Thereafter, the mask 1 was worn for 4 hours in 2 days at an external temperature of 8 to 10 degrees centigrade, but there was no hindrance to work due to cloudy glasses.

In the mask 1 having the flat mask shape shown in FIG. 8 of the present invention, the constituent material of the mask body 2 is an electret meltblown nonwoven fabric having a basis weight of 20 g / m ² spunbond nonwoven fabric, a second layer of 20 g / m ² , A spunbond nonwoven fabric having a basis weight of 20 g / m ² was laminated and used as the third layer. In either case, the material is polypropylene fiber. The initial size of the flat mask is 175 mm in length and 90 mm in width. The pleat form of the flat mask has an omega structure as shown in FIG. In order to improve the fit to the face, the lower side portion of the mask main body 2 was folded at a position of 35 mm from the right end, and joined and narrowed at the joint portion 11 as shown in FIG. The length of the folded side 12 from the lower side edge of the mask body 2 to the joint 11 is 25 mm. This joining was performed in the same manner on the other lower edge.

The sheet-shaped breath blocking material 3 is a closed-cell polyethylene foam sheet having a thickness of 2 mm, an apparent density of 15 kg / m ³ , and a bending resistance of 165 mm. The shape is trapezoidal as shown in FIG. It is. As shown in FIG. 8, the short side of the sheet-type exhalation-blocking material 3 is bonded to the upper end portion of the mask body 2 by a blocking-material bonding portion 7 with a width of 8 mm. The joining method used was the method shown in FIG. Double-sided adhesive tape was used for joining.

  As the nosepiece 4, a polyethylene thin plate having a plastic deformability with a thickness of 0.6 mm, a width of 6 mm, and a length of 110 mm was used as shown in FIG. The nosepiece 4 was joined to the blocking material joint 7 of the sheet-like exhalation blocking material 3 with a double-sided adhesive tape as shown in FIG. The gap between the sheet-shaped exhalation-blocking material 3 and the nosepiece 4 was about 0.5 mm. As shown in FIG. 8, the stretchable cord 5 is joined to the back surface of the mask body 2 at two places on the left and right sides by the stretchable cord joining portion 9.

  As shown in FIG. 8, the nosepiece 4 was set so as to be folded inside the back surface of the mask body 2 with the upper end of the blocking material joint 7 of the sheet-like exhalation blocking material 3 as a boundary. In addition, in order to adjust the resilience, both end portions of the sheet-like exhalation-blocking material 3 were spot-joined at the joint portion 13, and the center portion was spot-joined at the center joint portion 14. Thereby, the arch-shaped sheet-like exhalation-blocking material 3 was created. Furthermore, the cut part 15 of the lick cut was put so that the both ends of the upper side of the mask main body 2 might fit a face.

  Thereby, when wearing the mask of the present invention, the center part of the sheet-shaped exhalation-blocking material 3 is in close contact with the nose, and the arch-curved surface and the resilience are appropriately generated at the center and both ends of the exhalation-blocking material 3 so as to be in close contact with the face. did.

  Furthermore, the nosepiece 4 increased the fit. After wearing the mask 1 in the shape of the flat mask, the glasses were cooled in a refrigerator at 5 degrees Celsius for 2 minutes, then taken out into a room at 23 degrees Celsius and worn to evaluate the haze. As a result, cloudiness of the glasses due to exhalation after wearing was not recognized. The mask 1 was worn for 3 hours per day at an external temperature of 7 degrees Celsius, but there was no hindrance to work due to cloudy glasses.

In the mask 1 having the flat mask shape shown in FIG. 5 of the present invention, the constituent material of the mask body 2 is an electret meltblown nonwoven fabric having a basis weight of 20 g / m ² spunbond nonwoven fabric and a second layer of 20 g / m ² , A spunbond nonwoven fabric having a basis weight of 20 g / m ² was laminated and used as the third layer. In either case, the material is polypropylene fiber. The size of the flat mask is 175 mm in length and 90 mm in width. The pleat form of the flat mask has an omega structure as shown in FIG.

The sheet-shaped breath blocking material 3 is an open-cell polyethylene vinyl acetate copolymer foam sheet having a thickness of 4 mm, an apparent density of 29 kg / m ³ , and a bending resistance of 120 mm, and the shape is rectangular as shown in FIG. The width is 30 mm and both ends are cut obliquely. A mechanical adhesive 16 is bonded to the surface of the sheet-shaped exhalation blocking material 3 by a mechanical bonding method shown in FIG. 10A with a double-sided adhesive tape width of 7 mm, and a mechanical bonding material 17 is bonded to the back surface by a similar bonding method. Were bonded to both ends with a double-sided adhesive tape width of 10 mm.

  Further, the nose piece 4 was joined to the lower end on the short side of the back surface of the sheet-like exhalation-blocking material 3. As the nosepiece 4, a polyethylene thin plate having a plastic deformability having a thickness of 0.6 mm, a width of 6 mm, and a length of 120 mm was used. In this way, a composite 18 of the sheet-like exhalation-blocking material 3 was prepared. As shown in FIG. 7, a part of the sheet-like breath blocking material composite 18 is joined to the upper end portion of the mask body 2 by a blocking material joining portion 7 with a width of 7 mm. The joining method can be attached and detached using the method shown in FIG. As shown in FIG. 5, the elastic cord 5 was joined to the back surface of the mask main body 2 at two places on the left and right sides by the elastic cord joining portion 9.

  As shown in FIG. 6, a removable sheet-like breath blocking material composite 18 was set so as to cover the nose piece 4 by folding it inside the back surface of the mask body 2 with the blocking material joint 7 as a boundary. In addition, the mechanical adhesive portions 17 at both ends of the composite 18 of the sheet-like breath blocking material were joined to the mask body 2. Thus, since the sheet-like exhalation-blocking material 3 was bent, it fitted to the face with moderate resilience. Furthermore, the fit is improved by pressing with the nosepiece 4. After wearing the mask 1 in the shape of the flat mask, the glasses were cooled in a refrigerator at 5 degrees Celsius for 2 minutes, taken out into a room at 23 degrees Celsius, and worn to evaluate the haze. As a result, fogging of the glasses after wearing was not recognized. Thereafter, the dust removal mask was worn for 5 hours in 2 days at an external temperature of 6 to 10 degrees Celsius, but there was no hindrance to work due to fogging of the glasses.

DESCRIPTION OF SYMBOLS 1 Mask 2 Mask main body 3 Sheet-like exhalation-blocking material 4 Nosepiece 5 Elastic string 6 Joint part 7 Blocking material joint part 8 Bending part 9 Elastic string joint part 10 Gap 11 Joint part 12 Folding side 13 Joint part 14 Central joint part 15 Cutting Portion 16 Mechanical adhesive 17 Mechanical adhesive 18 Composite 19 Convex protrusion 20 Fiber 21 Loop fiber

Claims (10)

  A nose piece having plastic deformability is provided along the upper edge of the mask body of a predetermined shape, and a sheet-shaped exhalation-blocking material having a horizontally long rectangular shape and having flexibility and resilience is joined to the mask body in the vicinity of the nose piece. The mask is characterized in that the free end portion is folded inward so as to cover the nosepiece, and the rebound is fitted to the face to block out exhalation.   The mask according to claim 1, wherein the mask main body is a three-dimensional structure formed by joining a pair of left and right substrates at a curved joint.   The mask according to claim 1 or 2, wherein the sheet-like breath blocking material is a non-foamed sheet or a foamed sheet.   The mask according to any one of claims 1 to 3, wherein the nosepiece is arranged at a level lower than or overlapped with a joint portion of the sheet-like exhalation-blocking material.   The mask according to any one of claims 1 to 4, wherein a joint portion between the mask main body and the sheet-like breath blocking member is joined by any one of a double-sided tape, a welder method, and an adhesive.   The mask according to any one of claims 1 to 4, wherein the sheet-like exhalation-blocking material is detachable.   The sheet-shaped exhalation-blocking material is a composite in which a hook-and-loop fastener is provided along the lower side portion of the back surface, and a hook-and-loop fastener is provided at both corners on the upper surface. The mask according to claim 6, wherein the mask is detachable by a fastener.   8. The composite according to claim 7, wherein a nose piece is provided on the barrier material joint.   The mask according to any one of claims 1 to 8, wherein both ends of the folded free end portion of the sheet-like exhalation-blocking material are joined to the inner side surface of the mask main body via a joint portion.   10. The mask according to claim 9, wherein the central portion of the free end portion is further joined to the inner surface of the mask main body via the joint portion.

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