Sanitary mask

Abstract

This invention provides a sanitary mask that ensures improved filtration function by unidirectional ventilation of breath passing through the mask fabric in each area, thereby separating the functions of inhalation and exhalation into distinct compartments. [Solution] The mask is constructed by layering a mask cloth (1) having a filter material of a predetermined mask surface shape and an intake / exhaust surface material (2) having substantially the same mask surface shape as the mask cloth. A partition edge (4) is provided in the center of a portion of the common fabric surface of the mask cloth (1) and the intake / exhaust surface material (2), which is a linear edge shape consisting of a closed figure that blocks and partitions a portion of the fabric surface. The mask surface area of ​​the predetermined mask surface shape is planarly partitioned into an intake area (A1) located relative to the tip of the wearer's nose and the center of their mouth, and an exhalation area (A2) located relative to the wearer's face around them. and nausea area (A2) Block mutual airflow.

Description

Technical Field

[0001] The present invention relates to a sanitary mask used for preventing infection of a wearer or preventing the spread of infection to the surroundings.

Background Art

[0002] In recent years, masks with partial intake and exhaust parts attached to enhance the intake and exhaust functions have been disclosed.

[0003] For example, the nose inhalation and mouth exhalation dedicated mask disclosed in Patent Document 1 is provided with a cap-shaped exhaust valve and also a cap-shaped intake valve. Specifically, this nose inhalation and mouth exhalation dedicated mask is composed of a soft material cup that covers the nose and mouth, and a substantially horizontal partition for blocking ventilation at the boundary between the nose and mouth is provided on the inner surface of the cup. Two or more nose-side ventilation holes are provided on the nose side with this partition as a boundary, and one or more mouth-side ventilation holes are provided on the mouth side. Also, the nose-side ventilation holes and the mouth-side ventilation holes are bordered by a circular frame that is slightly harder than the cup, and an intake-only valve is attached to the nose-side ventilation holes and an exhalation-only valve is attached to the mouth-side ventilation holes on this frame. The circular frame has several support frames extending linearly in the diameter direction, and the intake-only valve and the exhalation-only valve are supported on the support frames. Outside the circular frame, an annular part that is integral with the circular frame and protrudes outward from the cup, a support column protruding from the central part of the support frame, and a cap for closing the inside of the annular part are provided. The cap has a ventilation hole provided at a position deviated from the center of the cap. Also, the intake-only valve and the exhalation-only valve are composed of a cylinder that can be inserted into the support column and a soft disk-shaped thin sheet attached to the tip of the cylinder. The intake-only valve, when exhaling, has the disk-shaped thin sheet pressed against the inner surface of the cap to block the ventilation hole, and the exhalation-only valve, when inhaling, has the disk-shaped thin sheet inserted into the support column closing the circular support frame, and is set on the frame.

[0004] Furthermore, the inhalation and exhalation mask disclosed in Patent Document 2 comprises a filter pad attached to the center that covers the mouth and nose. Specifically, this mask consists of a filter pad that covers the nose and mouth, and a mask body to which the filter pad is detachably attached to the inside. The filter pad has a three-dimensional shape, with protrusions on both sides, and recesses on the top and bottom of the base ends of the protrusions. An exhalation valve is provided approximately in the center of the front surface (1b) of the filter pad. The mask body has an attachment part for the filter pad, and mounting bodies are connected to both ends of this attachment part. The attachment part is made of mesh fabric, and a retaining hole for the exhalation valve is provided approximately in the center. The front of the attachment part and mounting bodies are covered with an outer cover. Hanging parts are provided at each base end on the attachment side of the mounting body, and the protrusions of the filter pad can be detachably attached to these hanging parts. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 4413217 [Patent Document 2] Patent No. 5700278 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0006] However, these conventional masks, or masks designed for nasal inhalation and oral exhalation, all have filters only on a portion of the mask surface. As a result, insufficient inhalation and exhalation are not achieved, and they do not take into account the prevention of infection spread by the dispersion of exhaled air around the wearer. In particular, conventional three-dimensional masks made entirely of highly adsorbent material allow the airflow from the wearer's mouth and nose to pass through the mask structure directly. In effect, only the central part of the mask allows air to pass in the opposite direction to the direction it was initially passed through, and the adsorption and filtering functions of the filter are performed only by this part, while the surrounding mask areas are hardly functional.

[0007] Furthermore, as the wearer breathes in and out, the same mask structure in the central part re-ventilates in the back-and-forth direction. As a result, there was a risk that dust, bacteria, and viruses that had been adsorbed by the filter could be scattered again by the re-ventilation, or re-entered into the ventilated air through the adsorbent part.

[0008] Therefore, the present invention has been made in view of these circumstances, and provides a sanitary mask that is relatively compact in structure and ensures improved filtration function of the mask by treating the breath passing through the mask cloth to ventilate the entire mask surface area, while also preventing the re-scattering or contamination of dust, bacteria, and viruses that have been adsorbed. [Means for solving the problem]

[0009] To address the above issues, the following measures have been taken. Note that the letters, numbers, or combinations thereof following each term are reference symbols added for convenience to refer to the drawings shown as examples, and do not limit the content or structure.

[0010] [1] The present invention provides a sanitary mask comprising a mask cloth (1) having a filter material in a predetermined mask surface area with a unified mask surface shape, and an intake / exhaust surface material (2) having a mask surface area with substantially the same mask surface shape as the mask cloth, which are superimposed in the same position, and ear loops (3) are provided on the left and right sides of the mask cloth, The intake and exhaust surface material (2) is divided into two areas: an intake area (A1) which is a central part of the mask surface shape and is located relative to the wearer's nose and the center of the mouth; and an exhalation area (A2) which is the peripheral area of ​​the mask surface shape excluding the central part and is located relative to the wearer's face, including the left and right cheeks. Numerous intake valve pieces (201) are arranged planarly across substantially the entire surface area of ​​the mask surface region of the intake area (A1) of the intake / exhaust surface material (2). These valve pieces open when ventilation occurs in one direction (thickness direction) toward the back of the mask and close when ventilation occurs in another direction (thickness direction) toward the front of the mask, thereby forming a one-way ventilation structure in which the main ventilation direction is the thickness direction corresponding to the wearer's inhalation. Numerous exhalation valve pieces (202) are arranged planarly across almost the entire surface area of ​​the mask surface region of the exhalation area (A2) of the intake and exhaust face material. These valve pieces open when ventilation occurs in the thickness direction toward the mask surface and close when ventilation occurs in the thickness direction toward the back of the mask, thereby creating a multi-directional ventilation structure in which the thickness direction in the other direction corresponding to the wearer's exhalation is the main ventilation direction. By overlapping the mask cloth (1) and the intake / exhaust surface material in the same position and fixing them at the periphery of each area, the filter material of the mask cloth (1) is configured to be separated into a filter material for the intake area (A1) and a filter material for the exhaust area (A2) in the same position as the intake / exhaust surface material (2). The filter material in each of these areas of the mask fabric is characterized by functioning independently as either a unidirectional or multidirectional airflow filter during the wearer's inhalation or exhalation.

[0011] In this way, the entire mask surface is divided into two areas, and a unidirectional ventilation structure is configured in each area, with one or both directions being the primary ventilation directions. As a result, the filter material in each area functions independently across the entire surface of the mask fabric. Compared to conventional masks that ventilate back and forth in only one area, this expands the ventilation area of ​​the mask fabric to cover the entire surface of the mask. This reduces the speed at which air passes through the mask fabric during breathing, thereby improving filtration efficiency.

[0012] In other words, with the above configuration of the present invention, the mask fabric in each area functions as a unidirectional airflow filter that does not allow reversible airflow in either direction. Therefore, dust and bacteria that have been adsorbed will not be released from adsorption or the adsorption function will not deteriorate due to reverse airflow or repeated airflow in both directions. As a result, the filter material in the intake area or the filter material in the exhaust area functions as a unidirectional airflow area, effectively performing reliable filtration and adsorption functions, and these functions are continuously performed, resulting in a relatively durable product.

[0013] [2] The inhalation area (A1) of the mask surface region of the mask cloth (1) and the intake / exhaust surface material (2) is formed into a three-dimensional shape having a vertically convex curved surface that three-dimensionally covers at least the entire nasal bridge including the tip and wings of the wearer's nose, from below the nose to the central part of the mouth, and the exhalation area (A2) of the mask surface region of the mask cloth (1) and the intake / exhaust surface material (2) is formed into a flat or gently curved surface shape that conforms to at least the wearer's face, When worn, a central three-dimensional space (S1) is formed between the central part of the wearer's face and the device, and a peripheral space (S2) is formed between the device and the side parts of the wearer's face. The central three-dimensional space (S1) is characterized by ensuring a certain volume range during both inhalation and exhalation.

[0014] In this design, most of the wearer's exhaled air moves from the central three-dimensional space (S1) to the peripheral space (S2), and is then exhausted from the peripheral space (S2) through the mask fabric (22) in the exhalation area (A2). In other words, when the wearer exhales, the inhalation valve piece (201) in the inhalation area (A1) closes and prevents exhaust from that area, so the exhaled air in the central three-dimensional space (S1) from the wearer moves to the peripheral space (S2), and is then exhausted to the outside of the mask through the mask fabric when the exhalation valve piece (201) in the exhaust area (A2) opens.

[0015] Furthermore, during inhalation, the fresh air filtered through the mask fabric in the inhalation area remains within the central three-dimensional space. The fresh air held within the central three-dimensional space is then drawn in during the inhalation of the next breath after exhalation, and subsequently, the inhalation valve opens to allow ventilation, drawing in yet another fresh air into the central three-dimensional space.

[0016] During exhalation, the inspiratory valves close in the inspiratory area, preventing airflow and preventing the central three-dimensional space from expanding beyond a certain volume. Conversely, the exhalation valves open in the surrounding exhalation area, allowing airflow. As a result, the wearer's exhaled air is exhausted outside the mask through the peripheral space (S2) surrounding the central three-dimensional space.

[0017] [3] The present invention provides a sanitary mask comprising a mask cloth (1) having a filter material of a predetermined mask surface shape and an intake / exhaust surface material (2) having substantially the same mask surface shape as the mask cloth, with ear loops (3) provided on the left and right sides. At the boundary between the intake area (A1) and the exhalation area (A2), a partitioning edge (4) is provided, which is a closed geometric line edge shape that divides the overlapping mask cloth and intake / exhalation surface material into the intake area and the exhalation area. This partitioned edge (4) blocks mutual airflow between the intake area (A1) and the exhalation area (A2) within each mask surface shape of the mask cloth and intake / exhaust surface material. Furthermore, the intake area (A1) of the intake / exhaust surface material is configured such that the unidirectional ventilation structure is formed by arranging numerous intake valve pieces, each consisting of small end-fixing pieces, in a fixed vertical and horizontal arrangement pattern in at least two rows each, across almost the entire surface area of ​​the mask surface region of the partitioned area, allowing air to pass only in the thickness direction of the intake direction. The exhaust area (A2) of the intake and exhaust surface material is characterized in that the multi-directional ventilation structure is formed by arranging exhaust valve pieces, each consisting of numerous end-fixed pieces, in a fixed vertical and horizontal arrangement pattern in at least two rows each, across substantially the entire surface area of ​​the mask surface region of the partitioned area, allowing air to vent only in the thickness direction of the exhaust direction.

[0018] The partition edge consists of the edge shape of a "closed figure" in mathematics, and is formed along a partition line (4L) of a predetermined width that surrounds the outer peripheral edge of the intake area (A1) in the center of the mask surface area within the mask surface shape. The mask cloth and the intake and exhaust surface material (including the cover cloth) are configured. For example, by compressing or solidifying in the thickness direction, the filter material of the mask cloth in the intake area (A1) and the one-way ventilation structure ensure the function of preventing the wearer from being infected by intake air, and the filter material of the mask cloth in the exhalation area (A2) and the other-way ventilation structure can ensure the function of preventing the spread of infection to the surroundings by exhalation.

[0019] By adopting the above configuration, the present invention is configured to be relatively compact, and the flow direction of air (breathing air) in the inner and outer directions passing through the mask cloth, that is, the ventilation direction, is defined in one main direction for each partitioned area, so that the function of the filter material of the mask cloth can be exerted more effectively and continuously. And, unlike the conventional mask, since air does not ventilate in both forward and reverse directions at the same part of the mask cloth, the incidence rate (rebreathing rate) of so-called rebreathing, in which exhaled air once released outside the mask is taken into the wearer's body again, can be relatively suppressed.

[0020] 〔4〕 The one-way ventilation structure and the other-way ventilation structure are the same ventilation structure, and the same ventilation structure is configured by switching (reversing) the front and back directions of the ventilation structure to the mask surface direction and the back surface direction, respectively, in the mask surface areas of the intake area (A1) and the exhalation area (A2) of the intake and exhaust surface material.

[0021] For example, the intake and exhaust surface material in the embodiments described below is partitioned by a partition edge (4) into an intake surface material 21 of an intake area (A1) and an exhaust surface material 22 of an exhaust area (A2). And, for the intake surface material 21, when the surface side of a small piece connecting material 20 formed by connecting a number of end fixing pieces 201 is overlapped with a breathable material (a breathable base material M made of a mesh material) so as to be in close contact, a one-way ventilation structure that closes in close contact during one-way ventilation due to intake is formed. Also, for the exhaust surface material 22, when the back side of a small piece connecting material 20 formed by connecting a number of end fixing pieces 202 is overlapped with a breathable material (a breathable base material M made of a mesh material) so as to be in close contact, an other-direction ventilation structure that closes in close contact during ventilation in the other direction due to exhaust is formed. Here, this one-way ventilation structure and the other-direction ventilation structure are composed of a small piece connecting material 20 of the same constituent material and a breathable material (a breathable base material M made of a mesh material) of the same constituent material, and have a substantially the same ventilation structure configuration except for the difference between the front and back surfaces to be overlapped. The first internal space shown by S1 and the peripheral space shown by S2 in FIG. 2 respectively correspond to the intake area and the exhaust area. In FIG. 2, for each area partitioned by a partition edge, the front and back of the same ventilation structure are switched and assembled. And, a mask surface shape is formed by the one-way ventilation structure and the other-direction ventilation structure assembled by changing the front and back for each area, and further, a mask cloth is overlapped on the front surface side of the entire mask surface shape, and a cover material is overlapped on the back surface side of the entire mask surface shape, thereby forming a mask body excluding the ear straps.

[0022] 〔5〕 The intake and exhaust surface material (2) includes a single small piece connecting material (20) common to an intake area (A1) and an exhaust area (A2), which has a mask surface shape of the entire intake and exhaust surface material, a first breathable base material (M1) that is partially arranged on the front side of the small piece connecting material (20) and in the central intake area portion and has an outer shape along the area shape of the intake area (A1), a second breathable base material (M2) that is partially arranged on the back side of the small piece connecting material 20 and in the peripheral exhaust area portion excluding the central portion and has an outer shape along the area shape of the exhaust area (A2), are overlapped and arranged, A small piece connecting member is provided with numerous end fixing pieces arranged in the same pattern within the surface of the intake area of ​​the small piece connecting member, allowing the ends of the small pieces to be fixed and opened and closed. A porous ventilation base material is then placed on top of the surface of this connecting member, thereby forming an intake valve piece that opens only during intake. A small piece connecting member is provided with numerous end fixing pieces arranged in the same pattern within the surface of the exhalation area of ​​the small piece connecting member, allowing the ends of the small pieces to be fixed and opened and closed. A porous ventilation base material is placed on the back side of this connecting member, thereby forming an exhalation valve piece that opens only when exhaling. The invention is characterized by partitioning the intake and exhaust areas with intake and exhaust surface materials by bonding or welding small connecting material, first ventilation base material, second ventilation base material, and mask cloth in the thickness direction along a partition line with a line edge shape consisting of a closed figure that conforms to the area shape of the intake area.

[0023] This configuration corresponds to Example 1 (Figure 3). As shown in Figure 3, a common single intake and exhaust surface material (20) has a first ventilation base material M1 with an area shape for the intake area (A1) and a second ventilation base material M2 with an area shape for the exhaust area (A2) superimposed on the front and back sides, respectively, and bonded in the thickness direction with a predetermined width along the dividing line of the intake area shape, which is a line edge shape consisting of a "closed figure".

[0024] Within the intake area (A1) of the intake / exhaust surface material (2), a small piece connecting material 20, which consists of numerous end fixing pieces that fix the ends of small pieces and allow for opening and closing, arranged in the same pattern on a planar surface, and porous ventilation base materials (M1, M2) placed on the front side thereof are arranged on top of each other, and bonded together with fixing parts 200 consisting of narrow vertical lines on the outer perimeter and within the area, thereby forming an intake / exhaust surface material for intake that has numerous intake valve pieces 201 that open only when intake occurs. Within the exhaust area (A2) of the intake / exhaust surface material (2), an intake / exhaust surface material for exhaust is partitioned by overlapping a small piece connecting material 20, which consists of numerous end fixing pieces arranged in the same pattern to fix the ends of the small pieces and allow for opening and closing, with a porous ventilation base material (M1, M2) placed on the back side thereof, and an exhaust valve piece 202 that opens only when exhaling.

[0025] [6] The intake and exhaust surface material (2) consists of a single breathable base material common to the intake area (A1) and the exhaust area (A2), which forms the mask surface shape of the entire intake and exhaust surface material. An intake surface material (21) with an area shape for the intake area (A1) portion, which is partially positioned in the center of the front side of the small piece connecting material 20, Exhaust surface material (22) with an area shape for the exhaust area (A2) portion, which is partially arranged around the back side of the small piece connecting material 20, By overlapping and arranging them, and by dividing the planar area with a line-edge shape consisting of a closed figure by the partition edge (4), Within the intake area (A1) of the intake surface material (2), a small piece connecting material 20 is formed by arranging numerous end fixing pieces, each fixed at the end of a small piece and capable of opening and closing, in the same pattern on a planar surface, and overlapping the central intake area portion of a porous ventilation base material placed on its front side, thereby forming an intake valve piece 201 that opens only during intake. The exhaust surface material (2) is characterized by having a small piece connecting material 20, which consists of numerous end fixing pieces arranged in the same pattern in a planar manner, with the ends of the small pieces fixed to enable opening and closing movement, and the exhaust area portion around a porous ventilation base material placed on the back side thereof, thereby forming an exhaust valve piece 202 that opens only when exhaust is occurring.

[0026] This configuration corresponds to Example 2 (Figure 6). A common single breathable substrate M0 has an intake surface material (21) with the area shape of the intake area (A1) and an exhaust surface material with the area shape of the exhaust area (A2) superimposed on the front and back sides, respectively, and bonded in the thickness direction with a predetermined width along the demarcation line of the exhaust area, which is a line edge shape consisting of a "closed figure".

[0027] [7] The filter cloth structure (11, 12) is selected according to the application of the sanitary mask, In the mask surface area of ​​the mask cloth (1), the inhalation area (A1) incorporates (forms a layer of) a bacterial / dust filter for the inhalation area (A1) as a filter material for the inhalation filter cloth structure (11, 12) to suppress the entry of bacteria or dust by the wearer's inhalation. The mask cloth (1) is characterized in that, within the mask surface area, the exhalation area (A2) incorporates (forms a layer of) a bacterial filter for the exhalation area (A2) as a filter material for the exhalation filter cloth structure (12) to suppress the external diffusion of bacteria caused by the wearer's exhalation. The filter materials of each area are partitioned and connected by each compartment edge 4, forming an integrated mask surface area consisting of a combination of unidirectional and multidirectional ventilation base materials for inhalation and exhalation, respectively.

[0028] [8] The outer periphery of the mask surface area of ​​the mask cloth and the intake / exhaust surface material is surrounded by a peripheral adhesion material that tightly adheres to the periphery of the intake / exhaust surface material. The entire mask surface area of ​​the intake / exhaust surface material (including both the intake area (A1) and the exhalation area (A2)) is configured in a three-dimensional shape that has an internal space between it and at least the wearer's face, and is characterized in that the internal space enclosed by the peripheral sealing material maintains a constant volume whether the wearer is inhaling or exhaling.

[0029] The configuration of Example 3 (Figure 9) corresponds to this configuration. The entire mask surface area is composed of a three-dimensional shape, and when worn, a single internal space is formed surrounded by the peripheral adhesive material. Fresh air is introduced into this internal space through inhalation, and the wearer's exhaled breath is exhausted through this internal space to the outside of the mask. The airflow within the mask fabric (the internal space when worn) remains constant, regardless of the wearer's breathing. [Effects of the Invention]

[0030] By adopting the above configuration, the present invention divides the entire mask surface area into an inhalation area and an exhalation area, controls the ventilation direction of each area to only one direction instead of both directions, and separates the functions of inhalation and exhalation, resulting in a relatively compact design while ensuring the ventilation function of the mask and allowing the respiratory air passing through the mask fabric to be ventilated throughout the entire mask surface area. Furthermore, it prevents the re-scattering or contamination of dust, bacteria, and viruses that have been adsorbed.

[0031] (Effects of each solution) Furthermore, by employing the solutions described in [2] and subsequent sections of the present invention, the mask can be constructed in a relatively compact manner, and the direction of airflow (breathing air) passing through the mask cloth in the inward and outward directions, i.e., the ventilation direction, is defined as a single main direction for each partitioned area. This ensures that the airflow within the mask cloth (the internal space when worn) is always in a constant direction, regardless of the wearer's breathing. As a result, the filter function of the mask cloth can be performed more effectively and continuously.

[0032] Furthermore, by incorporating a one-way ventilation structure and a multi-way ventilation structure in each partitioned area according to the solutions of the present invention [2] and subsequent steps, a mask structure is obtained in which ventilation does not occur in both forward and reverse directions within a single mask surface area. During inhalation, the mask fabric functions only for inhalation in the inhalation area in the center of the mask surface area, and during exhalation, the mask fabric functions only for exhalation in the exhalation area around the mask surface area, thus providing a sanitary mask with sufficient inhalation and exhalation functions. In addition, compared to conventional general-purpose masks, the incidence of so-called rebreathing (rebreathing rate), in which exhaled air that has been released to the outside of the mask remains in the space inside the mask and is re-inhaled into the body of the wearer, can be suppressed. [Brief explanation of the drawing]

[0033] [Figure 1] Rear view (a), cross-sectional view (AA), and cross-sectional view (BB) of the sanitary mask of Example 1, viewed from the reverse side. [Figure 2] Enlarged view of the α-α section in Figure 1(AA). [Figure 3] Exploded plan view showing the components of the sanitary mask of Example 1 arranged in order. [Figure 4] Figure 3: Enlarged view of the β-β section of the small piece connecting member 20. [Figure 5] Rear view (a) and cross-sectional view (CC) of the sanitary mask of Example 2, viewed from the reverse side. [Figure 6] Exploded plan view showing the components of the sanitary mask of Example 2 arranged in order. [Figure 7] Enlarged view of the γ-γ section of the small piece connecting member 20 in Figure 3. [Figure 8]Figures (a), (b), and (c) show the different wearing states of the sanitary mask in Example 2, viewed from above the wearer's head. [Figure 9] Rear view (a) and cross-sectional view (DD) of the sanitary mask of Example 3, viewed from the reverse side. [Figure 10] Exploded plan view showing the components of the sanitary mask of Example 3 arranged in order. [Modes for carrying out the invention]

[0034] Hereinafter, embodiments for carrying out the present invention will be described with reference to the figures shown as Examples 1, 2, and 3. The letters, numbers, or combinations thereof following each term are reference symbols added for convenience to refer to the drawings shown as embodiments, and do not limit the content or structure.

[0035] The sanitary mask of the present invention has as its basic configuration a mask cloth (1) having a filter material with a predetermined mask surface shape that covers the wearer's nose, cheeks, and mouth, and an intake / exhaust surface material (2) having substantially the same mask surface shape as the mask cloth, layered on top of each other, and ear loops (3) are provided on the left and right sides of the mask cloth (Figure 1).

[0036] The intake and exhaust surface material is planarly divided into an intake area (A1) which is a part of the central area of ​​the mask surface shape and is positioned relative to the tip of the wearer's nose and the center of their mouth, and an exhalation area (A2) which is the surrounding area excluding the central part and is positioned relative to the wearer's face, including their cheeks.

[0037] Numerous intake valve pieces (201) are arranged in a fixed pattern in the vertical and horizontal directions across almost the entire surface area of ​​the mask surface region of the intake area (A1) of the intake / exhaust face material. These pieces open (O) when air is ventilated in one direction (thickness direction) toward the back of the mask and close (S) when air is ventilated in another direction (thickness direction) toward the front of the mask, thereby forming a one-way ventilation structure in which the main ventilation direction is the thickness direction corresponding to the wearer's inhalation.

[0038] Numerous exhalation valve pieces (202) are arranged in a fixed pattern in the vertical and horizontal directions across almost the entire surface area of ​​the mask surface region of the exhalation area (A2) of the intake and exhaust face material. These pieces open (O) when air is ventilated in the thickness direction toward the mask surface and close (S) when air is ventilated in the thickness direction toward the back of the mask, thereby forming a multi-directional ventilation structure in which the thickness direction in the other direction corresponding to the wearer's exhalation is the main ventilation direction.

[0039] By layering the mask cloth and the intake / exhaust surface material in the same position, the filter material of the mask cloth is configured to be separated into the filter material for the intake area (A1) and the filter material for the exhaust area (A2) in the same position as the intake / exhaust surface material (2). Each of these filter media functions independently as either a unidirectional or multidirectional airflow filter during the wearer's inhalation or exhalation.

[0040] (Mask fabric (1) and ear loops (3)) The mask cloth (1) consists of a filter cloth structure (11, 12) in a predetermined mask shape, which is made by overlapping multiple filter cloths or by having a foam-like filter body inside in the thickness direction in part of it. The straight sides on both sides of the mask shape are vertical sides, and ear loops (3) for ear loops are fixed to the left and right sides, respectively, by sewing or welding, using these vertical sides as fixing parts.

[0041] The mask shape of the mask cloth of the present invention has a horizontally elongated mask surface area with semi-elliptical curved sides at the top and bottom and straight vertical sides on the left and right, and consists of a filter cloth in which multiple filter cloths are layered to form a filter material (Figures 1 and 2). In the inhalation area of ​​the mask surface area of ​​the mask cloth, a filter material for the inhalation area that suppresses the entry of bacteria or dust by inhalation is incorporated by a layered structure of filter cloth, and in the exhalation area of ​​the mask surface area of ​​the mask cloth, a filter material for the exhalation area that suppresses the outward diffusion of bacteria by exhalation is incorporated by a layered structure of filter cloth.

[0042] A key feature of the present invention is that a predetermined mask-shaped filter cloth structure (11, 12) is divided into an intake area (A1) of the intake surface material and an exhaust area (A2) surrounding it by a partition edge (4) composed of a "closed figure" within the mask shape. The intake area formed by this planar partition is formed into an intake filter cloth structure (11), and the exhaust area formed by the planar partition and an outer edge partition (5) along the periphery of the mask shape is formed into an exhaust filter cloth structure (12).

[0043] The inhalation filter cloth structure (11) uses a filter material that adsorbs bacteria and dust from outside the mask due to inhalation during wear, thereby preventing infection of the wearer. For example, the inhalation area (A1) of the mask surface area of ​​the mask cloth may have a built-in bacteria and dust filter to suppress the entry of bacteria or dust due to inhalation.

[0044] Furthermore, the filter cloth structure for exhaled breath (12) uses a filter material to prevent the spread of infection to third parties through exhaled breath. For example, the exhaled breath area (A2) of the mask surface area of ​​the mask cloth may have a built-in bacterial filter to suppress the external diffusion of bacteria through exhaled breath.

[0045] The filter material of the inhalation filter cloth structure (11) and the exhalation filter cloth structure (12) may be of the same material and thickness depending on the intended use of the sanitary mask, such as preventing inhalation infection of the wearer's own viruses and bacteria, blocking inhalation of airborne dust and pollen, or preventing the spread of infection from an infected wearer to the outside. Alternatively, the inhalation and exhalation filter cloth structures may be made of different materials or thicknesses in each area.

[0046] The mask cloth (1) may be composed entirely of a flat or planar surface, or entirely of a curved surface. Alternatively, as in each embodiment, only the filter cloth structure 11 of the central intake area A1 may be composed of a curved surface that protrudes toward the surface. In the mask cloth of Embodiment 1, the filter cloth structure 12 of the exhalation area A2 is composed of a single plane, while the filter cloth structure 11 of the intake area A1 is composed of a gently curving convex surface toward the surface (Figures 1(AA)(BB), 2). In Embodiment 1, a mask cloth with a convex curved surface only in the central part and an intake / exhaust surface material (2) consisting of a flat surface over the entire mask shape are superimposed, thereby forming a central convex space S110 only in the central part of the mask shape between the mask cloth of the intake area and the intake / exhaust surface material (2) (Figures 1, 2). This central convex space S110 maintains a constant volume during both inhalation and exhalation when worn, and can hold fresh air filtered by the filter cloth structure and free from the wearer's exhaled breath within this space.

[0047] (Central spatial space and surrounding spatial space) The entire mask surface area, formed by overlapping the mask cloth and the intake / exhaust surface material (2), is divided into a central intake area (A1) and a surrounding exhalation area (A2). The intake area of ​​the mask surface area, consisting of the mask cloth and the intake / exhaust surface material, is molded into a vertically convex three-dimensional shape that floats dome-shaped forward from the wearer's face, while the mask cloth of the exhalation area is molded into a substantially planar shape that follows at least the wearer's face. As a result, a central three-dimensional space (S1) within the partition edge constituting the intake area is always formed with a predetermined volume between the intake / exhaust surface material (2) and the wearer's face, and a peripheral space (S2) outside the partition edge constituting the exhalation area is formed around it.

[0048] (Central 3D space) The central three-dimensional space remains within a predetermined minimum and maximum volume range during both inhalation and exhalation, ensuring a constant volume range at all times. During inhalation, fresh air is drawn into the central three-dimensional space, while during exhalation, the inhalation valve in the inhalation area closes, causing exhaled air exceeding the maximum volume of the central three-dimensional space to move to the peripheral space. This exhaled air is then exhausted to the outside of the mask through the mask fabric in the exhalation area via the peripheral space. Since much of the filtered fresh air remains in the central three-dimensional space after inhalation, the occurrence of rebreathing can be relatively suppressed. In other words, compared to conventional general-purpose masks where inhalation and exhalation are repeated in the central mask fabric area, the re-inhalation of exhaled air into the wearer's body during the next inhalation is suppressed.

[0049] (Partition border (4)) In the central part of a portion of the common fabric surface of the overlapping mask fabric (1) and the intake / exhaust surface material (2), a partitioning edge (4) is provided, which is a linear edge shape consisting of a closed figure, that is, a shape in which all sides are connected (for example, rectangles and squares, including rectangles, polygons, ellipses, perfect circles, ovals, and rounded polygons with rounded corners), which blocks and demarcates a portion of the fabric surface. This partitioning edge (4) planarly divides the mask surface area of ​​a predetermined mask surface shape into an intake area (A1) located relative to the tip of the wearer's nose and the center of their mouth, and an exhalation area (A2) located relative to the wearer's face around it. The planar division by the partitioning edge (4) divides the intake area (A1) and nausea area (A2) is formed by blocking the airflow between them.

[0050] The central part of the mask surface area covered by the mask, which covers the wearer's nasal bridge, nasal tip, nasal plug, and the central part of the mouth, is defined as an inhalation area (A1) consisting of a vertically convex region formed by a closed figure. The mask cloth and the inhalation / exhalation surface material (2) are tightly attached in the thickness direction along the outer circumference of this region and fixed to a predetermined width, thereby forming a partition edge (4) in the shape of a closed figure of the inhalation area. This partition edge (4) divides the mask surface area into the inhalation area (A1) and the surrounding exhalation area (A2).

[0051] The intake area (A1) of the intake / exhaust surface material (2) consists of numerous intake valve pieces (201) arranged planarly across the entire surface area of ​​the area partitioned in the center of the mask shape, allowing air to pass through only in the thickness direction of the intake direction, that is, from the surface to the back surface, thus forming a one-way ventilation structure that allows air to pass through only in one thickness direction corresponding to the wearer's inhalation (Figures 1 and 2).

[0052] Specifically, the one-way ventilation structure consists of a ventilation base material M1 made of a mesh-like breathable material cut into an area shape, and small connecting material 20 made of a non-breathable surface material having vertical and horizontal cuts. These are superimposed on each other in a front-back and back-back positional relationship, and the ventilation base material M1 and the small connecting material 20 are bonded to each other by narrow fixing parts 201F provided vertically at regular intervals within the mask shape.

[0053] (Breathable base material (M1, M2)) The breathable base materials (M1, M2) consist of a porous structural surface material woven from numerous mesh wires arranged in a uniform pattern in the vertical, horizontal, and diagonal directions. Specifically, numerous mesh wires made of fine threads run linearly parallel in the vertical and horizontal directions, and / or in the rightward and leftward diagonal directions at predetermined angles in a plan view, and are arranged to intersect at evenly spaced intersections of these different directions. As a result, mesh openings are uniformly arranged within the surface of the breathable base material (Figures 3 and 6). When the small connecting material adheres closely to this breathable base material, the fixing piece of the small connecting material closes within the surface, creating a closed valve state. When the fixing piece of the small connecting material separates from this breathable base material due to the wearer's breathing, the fixing piece opens within the surface of the small connecting material, creating an open valve state. In Example 1, the intake and exhaust surface material 2 is composed of two breathable base materials M1 and M2, each shaped like an area, and one small connecting material, each shaped like the entire mask surface area (Figure 3). In Example 2, the intake and exhaust surface material 2 is composed of two small connecting pieces (connecting pieces for the intake valve piece and the exhaust valve piece) that have the shape of each area, and a breathable base material M0 that has the shape of the entire mask surface area (Figure 6). On the other hand, in Example 3, the breathable base material is not used as a component of the intake and exhaust surface material, and the intake and exhaust surface material 2 is composed of two small connecting pieces (connecting pieces for the intake valve piece and the exhaust valve piece) that are partially bonded to the mask cloth (1) and cover cloth (2C), respectively (Figure 10).

[0054] (Inhalation valve piece 201) Within the intake and exhaust surface material of the intake area, i.e., the constituent surface of the intake surface material (21), intake valve pieces 201, made of small pieces, are arranged in multiple rows in the vertical and horizontal directions in a fixed pattern. These pieces open only during intake and close during exhaust. Within the intake area (A1) of the intake and exhaust surface material (2), a small piece connecting material 20 is formed by arranging a large number of end fixing pieces (rectangular pieces identical in shape to the exhaust valve piece 202) that can be opened and closed by fixing the ends of the small pieces in the same pattern, and stacking a porous ventilation base material (M2) placed on the back side of the small piece connecting material 20 on top of it, thereby forming the intake valve piece 201 that opens only during intake (Figure 3). The end fixing piece is made of a small piece with one side of a horizontally elongated rectangle as a fixing piece, and the three sides that are not fixed are cut by cut lines 20CL.

[0055] The fixing portion 201F consists of multiple narrow lines arranged vertically at regular intervals within the mask shape. Within the plane of the small piece connecting member 20, numerous horizontally elongated rectangular "end fixing pieces" are arranged vertically, with this fixing portion serving as one end 201F in the same direction. Multiple rows of these "end fixing pieces" are formed horizontally, with a predetermined width between them and the fixing portion. Furthermore, the entire area on the back side of the small piece connecting member 20 is covered with a breathable cover cloth 2C, leaving a predetermined gap.

[0056] The cover cloth 2C is made of a breathable fabric that covers the entire mask surface area on the back of the mask, and is positioned opposite the wearer's face to allow ventilation from and to the intake and exhaust surface material. In this embodiment, the cover cloth 2C is made of a single piece of breathable fabric, but in an alternative form, the cover cloth may be formed in layers and a filter material may be used in part of the layers.

[0057] Each end fixing piece consists of a horizontally elongated rectangular piece with one end (either the top, bottom, left, or right edge) fixed. When the wearer inhales, this end fixing piece opens as an intake valve piece 201, with the open portion opening only to the back side around the fixing point of the end fixing piece. Furthermore, the small piece connecting material 20, which includes the end fixing piece and has a one-way ventilation structure, is made of a non-permeable surface material that does not allow air to pass through its entire area. When the wearer is not inhaling, the intake valve piece 201 closes in close contact with the ventilation base material along the entire area, forming a so-called closed valve state on a single plane.

[0058] This one-way ventilation structure ensures that the surface of the intake area (A1) is designed to allow only inhalation. The intake area (A1) ensures infection prevention for the wearer through inhalation, thanks to the filter material structure of the mask cloth (1) and the one-way ventilation structure.

[0059] (Multidirectional ventilation structure) On the other hand, the exhalation area (A2) portion of the intake and exhaust surface material (2) has a number of exhalation valve pieces (202) arranged planarly across the entire mask surface area of ​​the partitioned area, allowing air to pass only in the thickness direction of the exhalation direction, that is, from the back surface to the front surface, thus forming a multi-directional ventilation structure that allows air to pass only in the other thickness direction corresponding to the wearer's exhalation (i.e., the thickness direction opposite to the one-way thickness direction) (Figures 1 and 2).

[0060] In other words, the exhalation area (A2) of the mask shape, excluding the inhalation area, is defined as a region that covers both cheeks of the wearer's face and allows only exhaust. The inner circumference of this region is partitioned as a tight-fitting structure by a partitioning edge (4) in the shape of the closed figure of the inhalation area, and the outer circumference is partitioned as a tight-fitting structure that adheres to the wearer's face by a peripheral adhesive material (5) that follows the same outer shape as the mask fabric.

[0061] Specifically, the other-directional ventilation structure consists of a ventilation base material M1 made of a mesh-like breathable material cut into an area shape, and small piece connecting material 20 made of a non-breathable surface material with vertical and horizontal cuts. These are superimposed on each other in a positional relationship between the back and front sides (this positional relationship is the reverse of the one-way ventilation structure). The ventilation base material M1 and the small piece connecting material 20 are bonded to each other by fixing parts 200 consisting of multiple narrow vertical lines provided at regular intervals in the vertical direction within the mask shape (Figure 4). Within the plane of the small piece connecting material 20, numerous horizontally elongated rectangular "end fixing pieces" are arranged vertically, with this fixing part as one end 202F in the same direction. Multiple such rows are formed horizontally, with a predetermined width between the fixing parts. Furthermore, the entire area on the back side of the small piece connecting material 20 is covered with a breathable cover cloth 3C, leaving a predetermined gap.

[0062] (Vascular valve piece 202) Within the intake and exhaust surface material of the exhalation area, i.e., the exhaust surface material (22), several rows of small pieces, each containing an exhalation valve piece 202 that opens only during exhalation and closes during inhalation, are arranged in a fixed pattern in the vertical and horizontal directions. Within the exhalation area (A2) of the intake and exhaust surface material (2), a small piece connecting material 20 is formed by arranging numerous end fixing pieces (rectangular pieces identical in shape to the exhalation valve piece 202) that can be opened and closed by fixing the ends of the small pieces in the same pattern in a planar manner, and stacking a porous ventilation base material (M2) placed on the back side of the small piece connecting material 20 on top of it, thereby forming the exhalation valve piece 202 that opens only during exhalation (Figures 3, 4, and 7). The end fixing piece consists of a small piece with one side of a horizontally elongated rectangle as a fixing piece, and the three sides that are not fixed are cut by cut lines 20CL (Figures 4 and 7).

[0063] Each end fixing piece consists of a horizontally elongated rectangular piece with one end (either the upper, lower, left, or right edge) fixed, and in response to the wearer's exhalation, the opening portion of the end fixing piece opens only toward the surface, causing it to open as an exhalation valve piece 202 (Figure 4). Furthermore, the small piece connecting material 20 of the multi-directional ventilation structure, including the end fixing pieces, is made of a non-permeable surface material that does not allow for ventilation across the entire exhalation area, and when the wearer is not exhaling, the exhalation valve piece 202 closes in close contact with the ventilation base material along the entire area, forming a so-called closed valve state.

[0064] This multi-directional ventilation structure allows only exhaled air to ventilate the surface of the exhalation area (A2). The filter material of the mask cloth (1) in the exhalation area (A2) and the multi-directional ventilation structure ensure the function of preventing the spread of infection to the surroundings due to exhaled air.

[0065] The aforementioned one-way ventilation structure and the multi-way ventilation structure are ventilation structures constructed by stacking identical components, and are configured as stacked structures in which the front direction and back direction, that is, the order of the front and back when stacking the components, are switched between the intake area (A1) and the exhaust area (A2) of the mask surface region of the intake and exhaust surface material (see α-α cross section in Figure 2).

[0066] For example, in Figure 2, the left side of the partition edge (4) shown as the central three-dimensional space (S1) for intake is the intake area (A1). The one-way ventilation structure (21) in this part consists of two components: a ventilation base material (M1) composed of vertical and horizontal grid-like mesh wires, and a small piece connecting member (20) on which numerous intake valve pieces 201 are arranged. These two components are stacked from top to bottom in the cross-sectional view and fixed to each other at a fixing part. The numerous intake valve pieces 201 have one end in contact with the ventilation base material (M1) and are fixed at one end, and open only in one direction of ventilation in the thickness direction to allow ventilation. This fulfills the function of a one-way ventilation structure.

[0067] Furthermore, a breathable cover cloth (2C), indicated as a horizontal line, is positioned on the back side (downward in the diagram) at a distance from the two aforementioned components (Figures 1 and 2). These two components and the cover cloth (2C) are overlapped, and the two components and the cover cloth are sealed together by a partition edge (4) of a predetermined width around the outer periphery of the intake area, thereby forming a one-way ventilation structure.

[0068] Furthermore, in Figure 2, the right side of the partition edge (4) shown as the peripheral space (S2) is the exhaust area (A2). The multi-directional ventilation structure (22) in this area consists of two components: a small piece connecting member (20) with numerous small exhaust valve pieces 202 arranged on it, and a ventilation base material M1 composed of vertically and horizontally grid-like mesh wires. These two components are stacked from top to bottom in the cross-sectional view and fixed to each other at the fixing part. The numerous exhaust valve pieces 202 are fixed at one end to contact the ventilation base material (M2) and open only in the other direction of ventilation in the thickness direction to allow ventilation. This fulfills the function of a multi-directional ventilation structure.

[0069] Furthermore, a breathable cover cloth (2C), indicated as a horizontal line, is positioned below the two aforementioned components at a distance from them. These two components and the breathable cover cloth (2C) are overlapped, and the two components and the cover cloth are sealed by a predetermined width partition edge (4) on the outer periphery of the intake area and by a predetermined width peripheral partition edge (5) on the outer periphery of the exhaust area, thereby forming a multi-directional ventilation structure in the partitioned exhaust area.

[0070] (Example 1) The configuration of the sanitary mask in Example 1 will be described below with reference to the figures shown in Figures 1 to 4 and Figure 8 (rear view and AA, BB cross-sectional views, enlarged view of the AA cross-section in each state, exploded view of the manufacturing stage, enlarged view of the ββ section, and AA cross-sectional view in each state when worn).

[0071] (Shape of the sanitary mask in Example 1) The sanitary mask of Example 1 is The intake area (A1) of the mask surface region of the mask cloth (1) and the intake / exhaust surface material (2) is formed into a three-dimensional shape having a vertical convex curved surface that three-dimensionally covers at least the entire nasal columella, including the tip and wings of the wearer's nose, from below the nose to the central part of the mouth, By shaping the exhalation area (A2) of the mask surface region of the mask cloth (1) and the intake / exhaust surface material (2) into a substantially planar shape that conforms to the wearer's face, When worn, a central three-dimensional space (S1) is formed between the central part of the wearer's face and the device, and a peripheral space (S2) is formed between the device and the side parts of the wearer's face. By shaping the intake area (A1) of the mask surface region of the mask cloth (1) and the intake / exhaust surface material (2) into a vertically convex three-dimensional shape that three-dimensionally covers at least the entire columella including the tip and wings of the wearer's nose, from below the nose to the central part of the mouth, a central three-dimensional space (S1) is formed between the mask and the central part of the wearer's face when worn. By shaping the exhalation area (A2) of the mask surface region of the mask cloth (1) and the intake / exhaust surface material (2) into a substantially planar shape that conforms to at least the wearer's face, a peripheral space (S2) is formed between the mask cloth (1) and the sides of the wearer's face when the mask is worn.

[0072] Furthermore, the intake and exhaust surface material (2) of Example 1, as shown in Figure 3 during the manufacturing process, consists of a single common small connecting material (20) that has the mask surface shape of the entire intake and exhaust surface material and connects the intake area and the exhaust area. A first ventilation base material (M1) is positioned on the front side of the small connecting material (20) and partially in the central intake area, and has an outer shape that conforms to the area shape of the intake area, A second ventilation base material (M2), which is partially positioned on the back side of the small connecting material (20) and in the surrounding area excluding the central portion, and whose outer shape conforms to the area shape of the exhaust area, is placed on top of it. A small piece connecting member (20) is provided with numerous end fixing pieces (201) arranged in the same pattern within the surface of the intake area of ​​the small piece connecting member (20), which are capable of opening and closing by fixing the ends of the small pieces. A porous ventilation base material is then placed on top of the surface of the small piece connecting member, thereby forming an intake valve piece (201) that opens only during intake. A small piece connecting member is provided, with numerous end fixing pieces (202) that fix the ends of the small pieces within the surface of the exhalation area of ​​the small piece connecting member and allow for opening and closing operation, arranged in the same pattern in a planar manner. A porous ventilation base material is then placed on the back side thereof to form an exhalation valve piece (202) that opens only when exhaling.

[0073] Then, the area boundary (4) formed by the area shape of the intake area (A1) separates the planar region of the intake area (A1) from the surrounding exhaust area (A2) with a line boundary shape that is a "closed figure" (Figure 3).

[0074] Figure 3 shows the components of Example 1, namely the mask cloth 1, the first breathable base material M1 corresponding to the central intake area, the small connecting material 20 made of a non-breathable surface material having substantially the same shape as the mask cloth, the second breathable base material M2 corresponding to the peripheral exhalation area, and the cover material 2C made of a breathable surface material having substantially the same shape as the mask cloth, arranged vertically. These components are stacked from top to bottom as shown in the figure, from the front side to the back side. When stacking, the components are aligned and stacked using the outer shape and central opening shape of each component, which are the peripheral adhesion line 5L of a predetermined width along the periphery of the mask cloth area and the partition line 4L of a predetermined width along the shape of a predetermined closed figure in the center of the mask cloth area. After stacking the components, each component is sealed together by welding with peripheral adhesion material 5 along the peripheral adhesion line 5L, and each component is sealed together by welding with cross-sectional block-shaped adhesion material 4 along the partition line 4L.

[0075] In addition, among the components shown in Figure 3, the breathable base material (M2) has the same outer shape as the overall shape of the mask fabric. However, the central intake area (A1) within the surface of this shape is cut out as a central opening M20, resulting in a configuration consisting only of the exhalation area (A2). Within the intake area (A1) of the intake / exhaust surface material (2), a small piece connecting material 20 is formed by arranging numerous end fixing pieces (rectangular pieces identical in shape to the intake valve piece 201) in the same pattern on a planar surface, with the ends of the small pieces fixed and capable of opening and closing, and a porous ventilation base material (M1) placed on its front side, thereby forming an intake valve piece 201 that opens only during intake (Figure 3). Furthermore, the one-way ventilation structure and the multi-way ventilation structure are the same ventilation structure, and this same ventilation structure is configured by switching the orientation of the front and back of the ventilation structure in the mask surface area of ​​the intake area and the mask surface area of ​​the exhaust area of ​​the intake / exhaust surface material, respectively, to the mask surface direction and the back direction, respectively.

[0076] The partition edge (4) of Example 1 is composed of a vertically elongated rectangular shape along a partition line 4L of a certain width when viewed from the front or back. The partition edge (4) also appears in a cross-sectional view in the thickness direction (Figures 1(AA)(BB), 2(α-α)) as a barrier block with a predetermined thickness and a certain width, with a roughly rectangular cross-section. In particular, as shown in Figure 2(α-α), the partition edge (4) of Example 1 appears in cross-section as a barrier block of a predetermined width that connects the area edge from the outermost surface of the mask cloth 1 to the outermost surface (cover material 3C) of the intake / exhaust surface material 2 in the thickness direction. The lower edge of this barrier block (the surface that contacts the wearer's face) is cut at an angle, so that when worn, the cover material of the exhalation area forms a flat peripheral space (S2) that follows the curve of the face, and the edge of the cover material 3C of the intake area is slightly tilted away from the face, so that a central three-dimensional space (S1) with a volume of a certain or greater volume is always formed when worn.

[0077] The mask cloth (1) and the mask surface area of ​​the intake / exhaust surface material (2) are surrounded by a peripheral adhesive material (5). Of the mask surface area, at least the inhalation area (A1) is configured with a vertically convex three-dimensional shape that three-dimensionally covers the entire columella, including the tip and wings of the wearer's nose, and the central part of the lips (Figure 5(CC)). When worn, a central three-dimensional space (S1) is formed between the wearer's face and the three-dimensional shape (Figures 8a and 8b). This central three-dimensional space (S1) is formed to protrude in front of the central part of the wearer's face, and while worn, it ensures a constant volume between a predetermined minimum volume and a predetermined maximum volume.

[0078] The mask cloth (1) and the mask surface area of ​​the intake / exhaust surface material (2) are surrounded by a peripheral adhesive material (5). Within the mask surface area, the exhalation area (A2) is constructed with a horizontal, three-dimensional shape that three-dimensionally covers at least the left and right cheeks of the wearer. When worn, a central three-dimensional space (S2) dedicated to exhalation is formed between the wearer's face and the three-dimensional shape of the side portion, and this space increases in volume only during exhalation (Figure 8C).

[0079] (Inhalation valve piece 201) The intake valve piece 201 is closed when the wearer exhales, as each end fixing piece within the intake area (A1) comes into surface contact with the outer ventilation base material (M1, M2), blocking airflow. Conversely, when the wearer inhales, the portion of each end fixing piece within the intake area (A1), excluding the ends, separates from the outer ventilation base material (M1, M2), opening the valve to allow airflow in the intake direction. The end fixing pieces of the intake valve piece 201 consist of rectangular open pieces, with one end piece 201F fixed to the left or right, or top or bottom, by a fixing part (200) that partially partitions the inside of the small piece connecting material 20. A large number of end fixing pieces are arranged in a planar pattern within the area plane of the intake area (A1) of the small piece connecting material 20.

[0080] (Vascular valve piece 202) The exhalation valve piece 202 consists of an end fixing piece with one end piece 202F fixed at the end. When the wearer inhales, each end fixing piece within the exhalation area (A2) comes into surface contact with the outer ventilation base material (M2), creating a closed valve state that blocks airflow. Conversely, when the wearer exhales, the portion of each end fixing piece within the exhalation area (A2), excluding the end, separates from the outer ventilation base material (M2), creating an open valve state that allows airflow in the direction of exhalation. The end fixing pieces of the exhalation valve piece 202 consist of rectangular open pieces with one end piece 202F fixed at either the left / right or top / bottom by a fixing part (200) that partially partitions the inside of the small piece connecting material 20. A large number of end fixing pieces are arranged in a planar pattern within the area plane of the exhalation area of ​​the small piece connecting material 20.

[0081] Along the partition line 4L, which is the boundary between the intake area (A1) and the exhaust area (A2) of the intake / exhaust surface material 20, a partition edge 4 of a certain width is formed, thereby partitioning the areas so that they do not pass through each other. Numerous end fixing pieces, which are arranged planarly in each area, either open as opening pieces or close as check valves in response to the wearer's inhalation and exhalation.

[0082] In particular, in the central inhalation area that covers the wearer from the bridge of the nose to the mouth, a central three-dimensional space (S1) and a central convex space (S110) of a constant volume are constantly formed between the wearer's face and the mask. In the inhalation area, when exhaling, the inhalation valve piece 201 closes, preventing the wearer's exhaled air from passing through the mask fabric, and when inhaling, the inhalation valve piece 201 opens, allowing outside air that has passed through the filter material by the inhalation filter fabric structure 11 of the mask fabric to be drawn into the space. As a result, a relatively large amount of fresh air can be taken in within the central three-dimensional space (S1) and the central convex space (S110) compared to conventional general-purpose masks.

[0083] (Example 2) The configuration of the sanitary mask of Example 2 will be described below with reference to the figures shown in Figures 5 to 7 and 8 (rear view and CC cross-sectional view, exploded view of the manufacturing stage, enlarged view of the γγ section, and CC cross-sectional view of each state when worn). The sanitary mask of Example 2 is made by layering a mask cloth and an intake / exhaust surface material (2) that have a predetermined mask surface shape with a common horizontally elongated mask surface area similar to that of Example 1, and securing the ear loops at both ends. A certain width area along the periphery of the outer shape of the mask surface area is welded and solidified with a peripheral adhesive material (5) made of a rectangular cross-section elastic material, and a certain width area along the periphery of the intake area (A1) is welded and solidified with a partition edge (4) made of a rectangular cross-section elastic material.

[0084] More specifically, the sanitary mask of Example 2 has a three-dimensional shape only in the vertically elongated elliptical intake area at the top center, and the outer periphery of this intake area is partitioned by a partitioning edge (4), with the surrounding area being a flat mask surface region.

[0085] The mask cloth and intake / exhaust surface material, which have the aforementioned mask surface area, are overlapped at the same position, and the outer periphery of the exhalation area, which is the outer shape of the mask surface area, is welded with a peripheral adhesive material (5) made of an elastic frame with a rectangular cross-section, thereby fixing the mask cloth and intake / exhaust surface material at the periphery. Furthermore, the outer periphery of the intake area, which is the boundary between the exhalation area and the intake area, is welded with a partition edge (4) made of an elastic frame with the same rectangular cross-section as the peripheral adhesive material (5), thereby fixing the mask cloth and intake / exhaust surface material at the three-dimensional molded part in the center of the mask surface area.

[0086] In particular, Example 2 is characterized by having a semi-three-dimensional mask surface area that combines a planar shape and a three-dimensional shape. Specifically, the inhalation area (A1) of the mask surface area of ​​the mask cloth and the inhalation / exhalation surface material is composed of a vertically convex three-dimensional shape that three-dimensionally covers the entire nasal bridge, including at least the tip and wings of the nose of the wearer, as well as the area below the nose and the central part of the mouth, while the exhalation area (A2) of the mask surface area of ​​the mask cloth and the inhalation / exhalation surface material is composed of a planar shape that covers at least the ends of the wearer's mouth and both cheeks, thus having a mask surface area that combines a planar shape and a three-dimensional shape.

[0087] The inhalation area (A1) is constructed in a three-dimensional shape, creating a central three-dimensional space between the wearer's face and the area within the three-dimensional shape. This central three-dimensional space is formed between the wearer's face and the device when worn (indicated by S1 in Figure 8). This central three-dimensional space does not shrink (decrease in volume) below a certain volume during inhalation, nor does it expand (increase in volume) beyond a certain volume during exhalation, thus maintaining a constant volume.

[0088] Furthermore, in the manufacturing process of the intake and exhaust surface material (2) of Example 2, as shown in Figure 6, it consists of a single breathable base material common to both the intake and exhaust areas, an intake surface material (21) partially positioned in the central part of the front side of the breathable base material and having an outer shape that conforms to the area shape of the intake area within the mask surface region, and an exhaust surface material (22) partially positioned on the back side of the breathable base material, excluding the central part and having an outer shape that conforms to the area shape of the exhaust area within the mask surface region, which are arranged on top of each other. An intake valve is constructed by providing a small piece connecting member, which consists of numerous end fixing pieces arranged in the same pattern within the surface of the intake surface material (21), allowing the ends of small pieces to be fixed and opened / closed. Similarly, an exhaust valve is constructed by providing a small piece connecting member, which consists of numerous end fixing pieces arranged in the same pattern within the surface of the exhaust surface material, allowing the ends of small pieces to be fixed and opened / closed. Furthermore, the area shape of the intake area (A1) is formed by a partition edge (4), which separates the planar area of ​​the intake area (A1) from the surrounding exhaust area (A2) with a linear edge shape consisting of a "closed figure" (Figure 6).

[0089] Within the intake area (A1) of the intake / exhaust surface material (2), a small piece connecting material 20 is formed by overlapping a small piece connecting material 20, which has numerous end fixing pieces that fix the ends of the small pieces and allow for opening and closing operations, arranged in the same pattern as in the exhaust area, with the central intake area portion of a ventilation base material that is the mask surface shape of the entire intake / exhaust surface material that extends from the exhaust area, which is placed on the front side of the small piece connecting material 20. This creates a one-way ventilation structure with an intake valve piece 201 that opens only during intake. When not inhaling, the end fixing pieces of the intake valve piece 201 are in close contact with the ventilation base material, maintaining a closed valve state. The ventilation base material and the small piece connecting material 20, which are overlapped, are bonded and fixed together using fixing parts 200 as the vertical and horizontal grid-like linear portions around the area and within the area.

[0090] Within the exhaust area (A2) of the intake / exhaust surface material, a multi-directional ventilation structure is formed by overlapping a small piece connecting material 200, which has numerous end fixing pieces similar to those in the intake area, arranged in the same pattern as in the intake area, and a ventilation base material that is the mask surface shape of the entire intake / exhaust surface material that extends from the exhaust area, with the surrounding exhaust area portion of the ventilated base material placed on the back side of the small piece connecting material 200, which has an exhaust valve piece 202 that opens only when exhaling. The exhaust valve piece 202 maintains a closed state when not exhaling, with the end fixing piece in close contact with the ventilation base material. The ventilation base material and the small piece connecting material 20, which are overlapped with each other, are bonded and fixed together using the vertical and horizontal grid-like linear portions around the area and within the area as fixing parts 200.

[0091] The sanitary masks of Examples 1 and 2 described above are In the central part of a portion of the common fabric surface of the overlapping mask cloth (1) and intake / exhaust surface material (2), a partitioning edge (4) is provided, which is a linear edge shape consisting of a closed figure (i.e., a shape in which all sides are connected) that blocks and demarcates a portion of the fabric surface. This partitioning edge (4) consists of a peripheral adhesive material made of a rectangular cross-section elastic linear rib that protrudes to a certain height on the back side, and is formed by penetrating and welding to the mask cloth and intake / exhaust surface material. Then, this partitioning edge (4) divides the mask surface area of ​​a predetermined mask surface shape into an intake area (A1) located relative to the tip of the wearer's nose and the center of the mouth, and an exhalation area (A2) located relative to the wearer's face around it. and nausea area (A2) It is formed by blocking mutual ventilation.

[0092] The intake area (A1) of the intake / exhaust surface material (2) is configured as a one-way ventilation structure that allows air to pass only in the thickness direction corresponding to the wearer's inhalation, by arranging a large number of intake valve pieces (201) planarly across the entire mask surface area of ​​the partitioned area, thereby allowing air to pass only in the thickness direction corresponding to the wearer's inhalation. The exhalation area (A2) of the intake and exhaust face material (2) is configured with a multi-directional ventilation structure that allows air to circulate only in the thickness direction corresponding to the wearer's exhalation, by arranging numerous exhalation valve pieces (202) planarly across the entire mask surface area of ​​the partitioned area, thereby allowing air to circulate only in the thickness direction corresponding to the wearer's exhalation.

[0093] Furthermore, by providing a filter cloth structure for the filter material of the mask cloth (1) in the intake area (A1) with a filter for adsorbing bacteria and viruses that functions during inhalation, and a filter for filtering and adsorbing dust, together with the unidirectional ventilation structure of the intake and exhaust surface material (2), the function of preventing infection of the wearer through inhalation is ensured.

[0094] Furthermore, the filter fabric structure of the mask cloth (1) in the exhalation area (A2) is equipped with a filter that adsorbs bacteria and viruses that function when exhaled, thereby ensuring the function of preventing the spread of infection to the surroundings due to exhalation, along with a multi-directional ventilation structure.

[0095] This allows for the prevention of infection in the wearer themselves, as well as the prevention of the spread of infection to those around them. Furthermore, it can suppress the occurrence of rebreathing based on the wearer's repeated breathing. It also provides sufficient inhalation and exhalation functions.

[0096] (Example 3) The configuration of the sanitary mask of Example 3 will be described below with reference to the diagrams shown in Figures 9 and 10 (rear view and DD cross-sectional view). The sanitary mask of Example 3 is constructed by surrounding the outer periphery of the mask surface area of ​​the mask cloth and the intake / exhaust surface material with a peripheral adhesive material that protrudes at a predetermined height in the direction of the back of the intake / exhaust surface material, and the entire mask surface area of ​​the attachment surface of the intake / exhaust surface material (including both the intake area (A1) and the exhalation area (A2)) is constructed in a three-dimensional shape that has an internal space between it and at least the wearer's face.

[0097] In Example 3, the entire mask surface area is composed of a curved surface rather than a flat surface, resulting in a three-dimensional shape. During both inhalation and exhalation while wearing the mask, the internal space enclosed by the peripheral sealing material maintains a constant volume even during inhalation. Furthermore, unlike Examples 1 and 2, the compartmentalized edge 4 of Example 3 does not come into contact with the wearer's face, so the internal space between the face and the mask when worn is not divided into separate areas. Therefore, although the rebreathing rate is higher than in Example 1, the inhalation area and exhalation area are clearly separated by the compartmentalized edge 4, and air does not flow between compartments within the surface of the mask fabric or the inhalation / exhalation surface material.

[0098] Furthermore, in the manufacturing process, the intake and exhaust surface material (2) of Example 3 consists of a mask surface shape that includes the mask surface areas of both areas, as shown in Figure 10, and is partially fixed to the back side of the mask cloth. It has an intake surface material (21) whose outer shape follows the area shape of the intake area within the mask surface area, and an exhaust surface material (22) which is partially fixed to the outer side of the cover material (2C) excluding the central part, and has an outer shape following the area shape of the exhalation area within the mask surface area. These two are arranged on top of each other, and there are no breathable base materials M1, M2, M0 between them as in Examples 1 and 2. Furthermore, an intake valve piece is constructed by providing a small piece connecting member, which consists of numerous end fixing pieces arranged in the same pattern within the surface of the intake surface material (21), allowing the ends of small pieces to be fixed and opened / closed, and an exhaust valve piece is constructed by providing a small piece connecting member, which consists of numerous end fixing pieces arranged in the same pattern within the surface of the exhaust surface material, allowing the ends of small pieces to be fixed and opened / closed, and allowing the ends of small pieces to be fixed and opened / closed. Furthermore, the intake area (A1) is partitioned by a partition edge (4) formed by the area shape of the intake area (A1), thereby separating the planar region of the intake area (A1) from the surrounding exhaust area (A2) with a linear edge shape consisting of a "closed figure" (Figure 10). The partition edge (4) in Example 3 consists of a heat-seal structure in which the constituent materials are heat-pressed together in the thickness direction.

[0099] In addition, Example 3 also consists of a mask cloth and an intake / exhaust surface material (2) that have the same horizontally elongated shape as the mask surface area in Example 1, which are layered together, with ear loops fixed to both ends, and a certain width area along the periphery of the outer shape of the mask surface area is welded and solidified with a peripheral adhesive material (5) that consists of a rectangular cross-section elastic material.

[0100] Furthermore, the sanitary mask with the configuration described above has a three-dimensional mask surface that is smoothly formed by a curved surface that conforms to the wearer's face, and this surface is divided into two areas. Each area has a unidirectional ventilation structure with one or both directions as the main direction of airflow. Each area mainly consists of a unidirectional ventilation structure, and by preventing air from passing through the mask cloth in both forward and reverse directions, it is possible to suppress the re-release of adsorbent materials and bacteria that have been adsorbed and filtered by the filter material into the surrounding space.

[0101] Furthermore, by dividing the central part of the mask surface into an intake area with a unidirectional ventilation structure and the surrounding area into an exhalation area with a unidirectional ventilation structure, there is no forward or reverse ventilation within the same area. As a result, the filter material in each area functions independently across the entire surface of the mask fabric. This allows the filtration function of the mask fabric's filter material to be more reliable and effective over a longer period of time.

[0102] Compared to conventional masks that allow air to pass back and forth in only one area, this design expands the ventilation area of ​​the mask fabric to cover the entire surface of the mask, thereby reducing the airflow rate through the mask fabric during breathing and improving filtration efficiency.

[0103] In other words, with conventional masks, both inhalation and exhalation are concentrated around the nasal bridge, nasal tip, and the central part of the mouth in the width direction. As a result, air only circulates back and forth in a limited area of ​​this central region, and effectively only this limited area functions as a ventilating filter. Furthermore, because air repeatedly circulates in both forward and reverse directions in the central region, dust and bacteria that have been adsorbed by the filter material may not maintain their adsorption state, or the filter material may deteriorate and lose its filtration function.

[0104] In contrast, with the above configuration of the present invention, the respiratory air passing through the mask cloth is made unidirectional for each area, and the functions of inhalation and exhalation are partitioned and separated, thereby ensuring an improvement in the filtration function of the mask. That is, since the filter material in each area functions as a unidirectional ventilated filter material that does not allow reversible airflow in either direction, dust and bacteria that have been adsorbed will not be de-adsorbed or the adsorption function will not deteriorate due to repeated reverse airflow or forward and reverse airflow. The filter material in the inhalation area or the filter material in the exhalation area functions as a unidirectional ventilated area, and reliably performs filtration and adsorption functions continuously.

[0105] In the above embodiment 3, the intake and exhaust surface material (2) is configured with a one-way ventilation structure using an intake valve piece and a multi-way ventilation structure using an exhaust valve piece for each intake and exhaust area. The intake and exhaust valve pieces are placed before and after breathing (inhalation and exhalation), and both inhalation and exhalation operate under clean conditions as the air passes through the filter material of the mask cloth.

[0106] In other words, during inhalation, outside air passes through the filter material of the mask fabric and the inhalation valve piece into the wearer's body, and during exhalation, exhaled breath passes through the filter material of the mask fabric and is exhausted to the outside through the exhaust valve piece. Therefore, the installation and operating environment of the inhalation and exhaust valve pieces is clean, free from dust and bacteria, and is less susceptible to contamination and deterioration of the filter material due to their operation. Furthermore, by limiting the ventilation direction of each area to only one direction rather than both directions, not only can reliable filtration and adsorption functions be continuously performed in the inhalation area and the exhaust area, but the inhalation valve piece and exhaust valve piece of the inhalation and exhaust surface material can also continuously perform reliable valve opening and closing functions.

[0107] In addition to the embodiments described above, the present invention allows for various modifications without departing from its spirit, such as changing the number or shape of various components, omitting some components, integrating parts, or adjusting by replacing or changing the size of some components. For example, it is possible to omit the breathable base material of Examples 1 and 2 and construct a one-way ventilation structure with mask cloth (filter material) and small piece connecting material, or to construct a one-way ventilation structure with small piece connecting material and cover cloth. Alternatively, for example, a one-way ventilation structure may be constructed with mask cloth and intake / exhaust valve pieces, and this structure may be reversed to construct a multi-way ventilation structure, and these structures may be combined to form a mask surface area. Furthermore, the small piece connecting material only needs to consist of a large number of movable pieces of a predetermined shape arranged in a row over most of the area, and is not limited to the shape of end fixing pieces as in the embodiments. In addition to small piece connecting material composed of cut sheets as in the embodiments, a large number of movable pieces laid out in the area may be fixed to each other at one end, or partially fixed to cover cloth or mask cloth to allow movement. [Explanation of Symbols]

[0108] 1. Mask cloth 11,12 Filter cloth structure 2. Intake and exhaust surface material 20 Small piece connecting material 21 Intake surface material 22 Exhaust surface material 201 Intake valve piece 202 Nausea valve piece 3 Ear loops 4. Boundary of the plot 5. Peripheral adhesive A1 Intake Area A2 Nausea Area M0, M1, M2 breathable substrate

Claims

1. A sanitary mask is constructed by overlapping a mask cloth having a filter material of a predetermined mask surface shape and an intake / exhaust surface material having a mask surface area with substantially the same mask surface shape as the mask cloth at the same position, and ear loops are provided on the left and right sides of the mask cloth, The intake and exhaust surface material has a mask surface area that is planarly divided into an intake area in a part of the center of the mask surface shape and an exhaust area in the surrounding area excluding the part of the center. Numerous intake valve pieces are arranged planarly across almost the entire surface area of ​​the mask surface in the intake area of ​​the intake / exhaust face material. These valves open when air is vented in one direction (thickness direction) toward the back of the mask and close when air is vented in another direction (thickness direction) toward the front of the mask. This creates a one-way ventilation structure where the main ventilation direction is the thickness direction corresponding to the wearer's inhalation. Numerous exhalation valve pieces are arranged planarly across almost the entire surface area of ​​the mask surface in the exhalation area of ​​the intake and exhaust mask material. These valves open when air is vented in the other direction (thickness direction) toward the mask surface and close when air is vented in the one direction (thickness direction) toward the back of the mask. This creates a multi-directional ventilation structure where the other direction (thickness direction) corresponding to the wearer's exhalation is the primary ventilation direction. By overlapping and fixing the mask cloth and the intake / exhaust surface material in the same position, the filter material of the mask cloth is configured to be separated into an intake area filter material and an exhaust area filter material in the same position as the intake / exhaust surface material. Furthermore, a boundary edge consisting of a closed geometric line shape is provided at the boundary between the intake area and the exhaust area, which demarcates the intake area and the exhaust area. This partitioned edge blocks mutual airflow between the intake and exhalation areas within each mask surface shape of the mask fabric and intake / exhaust surface material. A sanitary mask characterized in that the filter media in the inhalation area and the exhalation area each function independently as a unidirectional or multidirectional airflow filter media, respectively, during the wearer's inhalation or exhalation.

2. The intake area of ​​the mask surface region of the intake and exhaust surface material is molded into a vertically convex three-dimensional shape that three-dimensionally covers at least the entire nasal columella, including the tip and wings of the wearer's nose, as well as the area below the nose and the central part of the mouth. By shaping the exhalation area of ​​the mask surface region into a planar shape that covers at least both ends of the wearer's mouth, The sanitary mask according to claim 1, characterized in that a central three-dimensional space is formed between the wearer's face and the three-dimensional shape, and this central three-dimensional space does not decrease in volume below a certain level during inhalation, nor does it increase in volume above a certain level during exhalation, thus maintaining a certain volume.

3. The intake area of ​​the intake and exhaust surface material is configured to have a unidirectional ventilation structure, in which intake valve pieces, each consisting of numerous end-fixing pieces, are arranged in a planar arrangement in a fixed vertical and horizontal pattern in at least two rows vertically and horizontally, allowing air to pass only in the thickness direction of the intake direction, over substantially the entire surface area of ​​the mask surface region of the partitioned area. The sanitary mask according to claim 1, characterized in that the exhaust area of ​​the exhaust face material has a multi-directional ventilation structure, which is formed by arranging exhaust valve pieces, each made of numerous end-fixing pieces, in a fixed vertical and horizontal arrangement pattern in at least two rows vertically and horizontally, on substantially the entire surface area of ​​the mask face region of the partitioned area, allowing air to pass only in the thickness direction of the exhaust direction.

4. The sanitary mask according to claim 1, characterized in that the one-way ventilation structure and the other-way ventilation structure are the same ventilation structure, and the same ventilation structure is configured by switching the orientation of the front and back of the ventilation structure in the mask surface region of the intake area and the mask surface region of the exhalation area of ​​the intake and exhaust surface material, respectively, to the mask surface direction and the back direction, respectively.

5. The intake and exhaust surface material comprises a single small connecting member common to the intake area and the exhaust area, which forms the mask surface shape of the entire intake and exhaust surface material. A first ventilation base material is located on the front side of the small connecting material and partially positioned in the central intake area, and has an outer shape that conforms to the area shape of the intake area, A second ventilation base material, which is partially positioned on the back side of the small connecting material and in the surrounding area excluding the central portion, and whose outer shape conforms to the area shape of the exhaust area, is placed on top of it. A small piece connecting member is provided with numerous end fixing pieces arranged in the same pattern within the surface of the intake area of ​​the small piece connecting member, allowing the ends of the small pieces to be fixed and opened and closed. A porous ventilation base material is then placed on top of the surface of this connecting member, thereby forming an intake valve piece that opens only during intake. A sanitary mask according to claim 1, characterized in that a number of end fixing pieces, which fix the ends of the small pieces and allow for opening and closing operation, are arranged in the same pattern on a planar surface within the exhalation area of ​​the small piece connecting material, and a porous breathable base material is placed on the back side thereof to form an exhalation valve piece that opens only when exhaling.

6. The intake and exhaust surface material comprises a single breathable substrate common to the intake area and the exhaust area, which has the shape of a mask surface for the entire intake and exhaust surface material. An intake surface material is partially positioned in the central part of the front surface of the breathable base material and has an outer shape that conforms to the area shape of the intake area, An exhaust surface material, which is partially positioned on the back side of the ventilated base material and in the surrounding area excluding the central portion, and whose outer shape conforms to the area shape of the exhaust area, is placed on top of it, The sanitary mask according to claim 1, characterized in that an intake valve piece that opens only when inhaling is configured by providing a small piece connecting material in which a large number of end fixing pieces, which are fixed to the ends of small pieces and can be opened and closed, are arranged in the same pattern on a plane within the surface of the intake surface material, and an exhaust valve piece that opens only when exhaling is configured by providing a small piece connecting material in which a large number of end fixing pieces, which are fixed to the ends of small pieces and can be opened and closed, are arranged in the same pattern on a plane within the surface of the exhaust surface material.

7. Within the mask surface area of ​​the mask fabric, the inhalation area incorporates a filter material for the inhalation area that suppresses the entry of bacteria or dust particles through inhalation. The sanitary mask according to claim 1, characterized in that the exhalation area of ​​the mask surface region of the mask cloth contains a filter material for the exhalation area that suppresses the external spread of bacteria caused by exhalation.

8. The outer periphery of the mask surface area of ​​the mask cloth and intake / exhaust surface material is surrounded by a peripheral adhesive material that adheres tightly along the periphery. The entire mask surface area of ​​the intake / exhaust faceplate is constructed in a three-dimensional shape that has an internal space between it and at least the wearer's face. The sanitary mask according to claim 1, characterized in that the internal space enclosed by the peripheral sealing material maintains a constant volume whether the wearer is inhaling or exhaling.

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