JP6924131B2 - Dust mask - Google Patents

Description

The present invention relates to a dust mask.

As for dust masks, the standards for dust masks are stipulated based on the provisions of Article 42 of the Industrial Safety and Health Act (Law No. 57 of 1972). According to this standard, there are two types of dust masks: replaceable dust masks and disposable dust masks. Of these, the disposable dust mask (mask) has an integrated filter material and face piece, and a fastening string. When the wearer wears the mask, the dust is filtered by the filter medium, and the wearer can inhale clean air. In addition, exhaled breath can be discharged into the outside air.

When the wearer wears the mask, the gap between the face and the mask is eliminated to improve the adhesion to the face, thereby reducing the leakage of outside air and the feeling of wearing (also referred to as "fitness"). It is desired that the product is excellent in cost and cost. Normally, the mask adjusts the tension of the tightening string to improve the adhesion to the face and reduce the degree of leakage of outside air (leakage rate) when worn. However, this method has a problem that the pressure applied to the contact surface between the face and the mask is increased, causing discomfort such as pain and itchiness to the wearer.

Therefore, Patent Document 1 describes a filter portion formed in a substantially hemispherical shape so as to cover the nose portion and the mouth portion, and an opening extending from the entire outer edge of the filter portion to the center and located in the nose portion and the mouth portion. A mask consisting of a face-contact cushion to have and a mask has been proposed. Since this mask has a three-dimensional facial contact cushion along the undulations of the face, the fit is improved by eliminating the bias of the pressure applied to the contact surface between the face and the mask and improving the adhesion to the face. It is something to improve.

However, in the mask described in Patent Document 1, it is necessary to provide a plurality of undulations in the filter portion according to the three-dimensional facial contact cushion along the undulations of the face. As a result, a complicated process for welding the filter portion and the face-contact cushion is required, which requires advanced manufacturing equipment and increases the cost.

Further, Patent Document 2 proposes a disposable dust mask in which a flexible portion is provided on the main body instead of a three-dimensional shape so that the main body and the face are brought into close contact with each other. The mask described in Patent Document 2 is intended to improve the adhesion to the face and the wearing feeling by providing a stretchable bent portion on the entire circumference of the lower peripheral edge of the shape-retaining filter in the mask face body.

However, the mask described in Patent Document 2 uses a non-woven fabric made of a synthetic resin fiber having a predetermined hardness as a bent portion of the shape-retaining filter. For this reason, the shape-retaining filter cannot have the flexibility to adhere to the complicated undulations of the face, and there remains a problem in the adhesion of the mask.

Japanese Patent No. 4845861 Japanese Patent No. 5313220

The present invention has been proposed in view of the above circumstances. By improving the adhesion to the face, the degree of leakage of outside air (leakage rate) is reduced, and a dustproof mask excellent in fit and cost is achieved. The purpose is to provide.

In the first aspect of the dust mask according to the present invention, the mask body formed by bulging in a cup shape except for the peripheral edge portion and the peripheral edge of the outer peripheral edge portion are fixed to a part of the peripheral edge portion of the peripheral edge portion of the mask body. A dustproof mask comprising a face seal portion having an inner peripheral edge projecting inward, and projecting radially outward from an end portion on the upper side surface of the peripheral edge portion of the mask body. A set of first projecting portions, a set of second projecting portions radially outward from the lower side end of the peripheral edge portion of the mask body, a peripheral edge portion of the mask body, and the above 1 A dustproof portion comprising a ruled line portion formed of a concave groove recessed from a surface of the second protruding portion of the set, which is recessed from the surface of the second protruding portion of the set , over the boundary with the second protruding portion of the set. It's on the mask.

A second aspect of the dustproof mask according to the present invention is that the mask body, the set of first protrusions, and the set of second protrusions are integrally molded from a sheet material. It is in the dustproof mask of the first aspect characterized by.

In a third aspect of the dust mask according to the present invention, the face seal portion has the outer peripheral edge fixed to the entire circumference of the peripheral edge of the mask body, and the inner peripheral edge protrudes inward. It is in the dust mask of the first aspect or the second aspect, which comprises forming an opening around the area corresponding to the nose and the mouth.

A fourth aspect of the dust mask according to the present invention is a set of third sets in which the face seal portion projects radially outward from the peripheral edge of the outer peripheral edge portion corresponding to the first set of first projecting portions. It has a protrusion and a set of fourth protrusions that protrude outward from the peripheral edge of the outer peripheral edge corresponding to the set of second protrusions, and has a set of third protrusions. The peripheral edge of the peripheral edge of the portion is fixed to the peripheral edge of the peripheral edge of the first set of protruding portions, and the peripheral edge of the peripheral edge of the fourth protruding portion of the set is the peripheral edge of the second protruding portion of the set. The dust mask according to any one of the first to third aspects, characterized in that it is fixed to the peripheral edge of the portion.

In a fifth aspect of the dust mask according to the present invention, the face seal portion, the set of third protrusions, and the set of fourth protrusions are integrally molded from a sheet material made of foamed elastic material. It is in the dust-proof mask of the fourth aspect, which is characterized in that it is made of.

A sixth aspect of the dust mask according to the present invention comprises two recessed grooves in which the ruled line portions are separated from each other and recessed from the face seal portion side surface of the pair of second protruding portions. It is in the dust mask according to any one of the first to fifth aspects.

A seventh aspect of the dust mask according to the present invention comprises a set of straps each having two fixed ends, one of the pair of straps on the set of first protrusions. Dust protection according to any one of the first to sixth aspects, wherein the two fixed ends are fixed to each other, and the other is fixed to the second protruding portion of the set. It's on the mask.

According to the present invention, it is possible to provide a dustproof mask excellent in fit and cost as well as reducing the degree of leakage of outside air (leakage rate) by increasing the adhesion to the face.

It is a front view of the dustproof mask. It is a schematic side view of the dustproof mask. It is a back view of the dustproof mask. (A) is a cross-sectional view taken along the line AA'of the first protruding portion of FIG. 1, and FIG. 1B is a cross-sectional view taken along the line BB'of the second protruding portion. (A) is a perspective view showing a state before bending a set of second protrusions of a dust mask, and (b) is a perspective view showing a bent state. FIG. 4B is a view showing a state in which the second protruding portion of the cross-sectional view taken along the line BB'of FIG. 4B is bent. (A) is an enlarged photograph of the first protruding portion of the photograph when the dust mask is worn, and (b) is an enlarged photograph of the second protruding portion. It is a figure which showed each manufacturing process of the dustproof mask. (A) is a back view of the ultrasonic horn mold, and (b) is a front view of the dust mask before the fastening string is fixed. It is a front view of the dust mask of another embodiment. It is a front view of the dust mask of another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following description shows one aspect of the present invention, and can be arbitrarily changed within the scope of the present invention. Those with the same reference numerals in the drawings indicate the same members, and the description thereof is omitted as appropriate. The components shown in each drawing, that is, the shape, size, thickness, relative positional relationship, etc. of each part may be exaggerated in explaining the present invention.

(Dust mask)
FIG. 1 is a front view of the dust mask, FIG. 2 is a schematic side view of the dust mask, and FIG. 3 is a back view of the dust mask. In FIG. 4, (a) is a cross-sectional view taken along the line AA'of one of the first protrusions of FIG. 1, and FIG. 4B is a cross-sectional view taken along the line BB'of one of the second protrusions.

As shown in the figure, the dustproof mask 1 according to the embodiment of the present invention is located at different positions on the mask main body 10, the face seal portion 20 fixed to the face contact surface side of the mask main body 10, and the peripheral edge portion of the mask main body 10. Each includes a set of fastening cords 30 fixed to each other. The dust mask 1 is an overhead type (head-mounted type).

The mask body 10 is formed to bulge (protrude) into a cup shape (bowl shape) except for the peripheral portion so that the mouth and nose of the wearer's face can be covered. The shape of the mask body 10 is not particularly limited as long as it is possible to secure a space inside that does not hinder the intake of the wearer's inspiration and the discharge of exhaled air. The space of the mask body 10 should have an appropriate size because if the internal volume of the mask body 10 is too large, ventilation will be poor and the carbon dioxide concentration will increase, causing the wearer to feel stuffy. Is preferable. The mask body 10 has a shape including, for example, a hemispherical shape, a semi-elliptical spherical shape, a trapezoidal shape on the side surface, and a shape obtained by appropriately deforming them, and the nose and mouth can be comfortably formed. Any shape may be used as long as it can be covered.

Further, the mask main body 10 is formed from a set of first projecting portions 11a and 11b that protrude outward from the end portion on the upper side surface side of the peripheral edge portion and the end portion on the lower side surface side of the peripheral edge portion. A set of second projecting portions 12a and 12b, which project radially toward the outside, are provided. In the present embodiment, the mask main body 10, a set of first protruding portions 11a, 11b, and a set of second protruding portions 12a, 12b are integrally molded from a sheet material described later. Further, the end portion on the upper side surface of the peripheral edge portion of the mask main body 10 is an end portion where the peripheral edge portion of the mask main body 10 corresponds to the cheekbone portion of the face, and the end portion on the lower side surface side of the peripheral edge portion of the mask main body 10. Is an end portion of the mask body 10 corresponding to the lower cheek portion of the peripheral portion of the face. Further, both ends (two fixed ends) of the set of tightening strings 30 are fixed to the face non-contact surfaces of the set of the first protrusions 11a and 11b and the set of the second protrusions 12a and 12b, respectively. ing. A set of first protrusions 11a and 11b and a set of second protrusions 12a and 12b are for attaching a set of tightening cords 30, respectively.

One set of the first protruding portions 11a and 11b is integrally extended with the peripheral portion of the mask main body 10 in the outward direction, and the boundary with the peripheral portion has no crease or the like and is outwardly extended. It is protruding. Further, when the dust mask 1 is worn, the positions of the vertices of the first set of first protrusions 11a and 11b are arranged closer to the ears than the positions of the vertices of the cheekbones of the wearer's face. As a result, the set of first protrusions 11a and 11b can wrap the cheekbone portion without the skin directly hitting the thin cheekbone portion. That is, the dust mask 1 forms a cheekbone portion holding structure that wraps the cheekbone portion with the entire set of the first projecting portions 11a and 11b when worn. With such a cheekbone holding structure, the face seal portion 20 in the region of contact with the nose and cheekbones when worn is partially elastically deformed and an appropriate pressure is applied, so that the dust mask 1 can be brought into close contact with the face.

A set of the second projecting portions 12a and 12b is integrally extended with the peripheral edge portion of the mask main body 10 in the outward direction, and a crease (ruled line portions 13a to be described later) is formed at the boundary with the peripheral edge portion. 13d) is provided and projects outward. Further, when the dust mask 1 is worn, the positions of the vertices of the pair of second protrusions 12a and 12b are arranged below the wearer's ear (lower cheek side). When an external force (in this embodiment, the tension of the tightening string 30) is applied, the pair of second protruding portions 12a and 12b are bent by the ruled line portions 13a to 13d provided at the boundary with the peripheral portion of the mask main body 10. That is, the dustproof mask 1 forms a bent structure in which the ruled line portions 13a to 13d provided at the boundary between the mask main body 10 and the pair of second protruding portions 12a and 12b are naturally bent by an external force. Due to such a bent structure, a set of second protruding portions 12a and 12b are bent when worn, and the face seal portion 20 in the area in contact with the cheek and chin can be brought into close contact with the face without elastic deformation. can. In particular, the skin on the cheeks is soft, and if the face seal portion 20 that abuts on the cheek region is elastically deformed, a gap is created between the face and the face. It is preferable that the face seal portion 20 in the region abutting the portion is not elastically deformed. In the present embodiment, since the dust mask 1 has a bent structure, an appropriate pressure is applied to the face so that the dust mask 1 can be brought into close contact with the face.

In the front view of the dust mask 1, the shapes of the first set of first protrusions 11a and 11b and the set of second protrusions 12a and 12b are triangular pyramids (mountain shapes) with the corners of the vertices dropped. The shape is not limited to this shape as long as a space for fixing each end of the set of tightening strings 30 is secured and the wearer of the dust mask 1 is not discomforted such as pain and itching. For example, it may be rectangular, circular, semicircular, etc., or may be a combination of these shapes. For example, a keyhole shape in which one end of the rectangular shape in the longitudinal direction is circular. May be good.

Ruled line portions 13a to 13d are provided at the boundary between the peripheral edge portion of the mask main body 10 and the pair of second protruding portions 12a and 12b. Two ruled line portions 13a and 13b are provided on the second protruding portion 12a side so as to be separated from each other, and two ruled line portions 13c and 13d are provided on the second protruding portion 12b side so as to be separated from each other. There is. Here, the ruled line portions 13a to 13d are linear creases provided so that a set of second protruding portions 12a and 12b can be bent by the tension of the tightening string 30 when the dust mask 1 is worn. Although the details will be described later, the ruled line portions 13a to 13d are formed at the same time when the mold is pressed from the face contact surface side of the face seal portion 20 and the mask body 10 and the face seal portion 20 are ultrasonically welded. NS. The ruled line portions 13a to 13d are creases protruding in the bulging direction of the mask body 10.

The ruled line portions 13a to 13d may be installed on the peripheral portion of the mask main body 10 which is not a bulging portion, and the installation position may be set according to, for example, the size of the wearer's face. Further, the shape of the ruled line portions 13a to 13d is not limited to a linear shape as long as it functions as a crease of a set of second protruding portions 12a and 12b, and may be, for example, a dotted line shape or a chain line shape.

Further, the number of the ruled line portions 13a to 13d is not limited to the configuration in which two of the ruled line portions 13a to 13d are provided in each of the second protrusions 12a and 12b of the set as long as they function as creases of the second protrusions 12a and 12b of the set. For example, one may be provided or three or more may be provided, respectively. In the present embodiment, from the viewpoint of easily bending one set of the second protrusions 12a and 12b, two sets of the second protrusions 12a and 12b are provided respectively.

Although details will be described later, the protrusions 21c and 21d of the face seal portion 20 are fixed to the face contact surface side of the set of second protrusions 12a and 12b, respectively, and the set of second protrusions 12a and 12a, respectively. 12b has a predetermined thickness. Due to such a thickness, when the dust mask 1 is bent at 90 ° with respect to the horizontal plane, for example, if it is to be bent at one time, it will be combined with a set of second protrusions 12a and 12b (outside). , The folding position is deviated from the protruding portions 21c and 21d side (inside), and the folding positions are buffered with each other, making it difficult to bend. Therefore, in the present embodiment, the second protruding portion 12a is provided with two ruled line portions 13a and 13b, and the second protruding portion 12b is provided with two ruled line portions 13c and 13d. As a result, when bending the second projecting portion 12a by, for example, 90 ° with respect to the horizontal plane of the dust mask 1, the second protruding portion 12a can be bent by 45 ° with respect to the horizontal plane of the dustproof mask 1 at the ruled line portion 13a, and further bent by 45 ° with respect to the horizontal plane of the dustproof mask 1. Yes (see Figure 6). Although not shown, the second protruding portion 12b can be bent in the same manner as the second protruding portion 12a. In this way, when bending the dust mask 1 at a predetermined angle with respect to the horizontal plane, if the dust mask 1 is bent in half of the predetermined angle in two steps, the deviation width of the folding position on the protruding portions 21c and 21d side, which is a valley portion, is widespread. Can be reduced, and buffering between the protrusions 21c and 21d and the pair of second protrusions 12a and 12b can be avoided.

The material of the mask body 10 is not particularly limited as long as it can take in the inspiratory air of the wearer and discharge the exhaled air and function as a filter unit that enables filtration of the exhaled air and the inspiratory air. For example, it is composed of a shape-retaining sheet material 100 (see FIG. 8A) that holds the shape of the mask body 10 and a filter material 110 (see FIG. 8B) that imparts a filter function to the mask body 10. A sheet material having good air permeability can be applied. Examples of such a sheet material include fiber non-woven fabrics containing thermoplastic synthetic fibers (heat-sealing fibers), woven fabrics, perforated plastic films, laminated sheets thereof, gauze, cotton cloth and the like. be able to. In particular, it is a breathable non-woven fabric sheet containing heat-sealing fibers, such as melt blown (MB) non-woven fabric, spunbond (SB) fiber non-woven fabric, laminated (SMS) fiber non-woven fabric, and air-through (thermal bond) non-woven fabric. It is preferable to use a sheet material made of various known fibrous non-woven fabrics. The sheet material may contain fine particles having a deodorizing effect such as activated carbon, or an intermediate sheet containing an antibacterial agent, an fragrance, or the like may be interposed between the sheet materials.

The face seal portion 20 is arranged on the face contact surface side of the mask body 10 so as to be in close contact with the face when the dust mask 1 is worn, and can be elastically deformed at least according to the undulations of the nose and cheekbones. However, it has an appropriate degree of flexibility. The shape of the face seal portion 20 can be appropriately changed according to the shape of the bottom surface (face contact surface) of the mask body 10. In the present embodiment, since the mask main body 10 is provided with a set of first protruding portions 11a and 11b and a set of second protruding portions 12a and 12b, the peripheral portion of the face seal portion 20 is provided according to the shape thereof. Protruding portions 21a to 21d that project radially outward from each end on the upper side surface side and the lower side surface side are provided. In the present embodiment, the face seal portion 20 and the projecting portions 21a to 21d are integrally molded from a sheet material described later. The protrusions 21a and 21b correspond to a set of first protrusions 11a and 11b, and the protrusions 21c and 21d correspond to a set of second protrusions 12a and 12b.

Further, in the face seal portion 20, the inner peripheral edge portion thereof protrudes inward, and an opening 22 is formed so as to surround a region corresponding to the nose portion and the mouth portion. As a result, the wearer's nose and mouth can insert the opening 22, and the mask body 10 and the face can be brought into close contact with each other to prevent dust from entering from the outside. In the present embodiment, the face seal portion 20 is configured to be in contact with the portion corresponding to the wearer's nose and mouth except for the opening 22, but dust invades from the outside without imposing a burden on the wearer. If it can be prevented, it is not limited to the configuration. For example, the peripheral edge of the outer peripheral edge of the face seal portion 20 may be fixed to a part of the peripheral edge of the peripheral edge of the mask body 10, and the inner peripheral edge portion may be configured to project inward. In such a configuration, a gap is easily formed between the mask body 10 and the face, and a portion where dust invades from the outside, for example, the face seal portion 20 is in contact with at least a portion corresponding to the wearer's nose. .. In this case, if necessary, the portion of the mask body 10 corresponding to the nose portion may be reinforced by using a reinforcing tool such as a nose wire (nose pad).

In the present embodiment, the peripheral edge of the outer peripheral edge of the face seal portion 20 is fixed to the entire circumference of the peripheral edge of the mask main body 10, while the peripheral edge of the mask main body 10 is integrally extended. The peripheral edge of the outer peripheral edge of the face seal portion 20 is not fixed to the region corresponding to the pair of first protruding portions 11a and 11b and the set of second protruding portions 12a and 12b. This is because the peripheral edges of the first set of first protrusions 11a and 11b and the second set of second protrusions 12a and 12b and the peripheral edges of the outer peripheral edges of the protrusions 21a to 21d are fixed to each other. Further, two concave grooves are provided at the boundary between the peripheral edge portion of the face seal portion 20 and the projecting portions 21a to 21d. These concave grooves are ruled line portions 13a to 13d that are recessed when the mold is pressed from the face contact surface side of the face seal portion 20 and the mask body 10 and the face seal portion 20 are ultrasonically welded. ..

Here, the method of fixing the mask body 10 and the face seal portion 20 and the method of fixing the set of the first protruding portions 11a and 11b and the set of the second protruding portions 12a and 12b and the protruding portions 21a to 21d are described. Generally, methods such as welding by heat or ultrasonic waves, sewing, and adhesives are applied, but in the present embodiment, both are fixed by ultrasonic welding. By applying ultrasonic welding, the mask body 10 and the face seal portion 20 are fixed to each other, and a set of first protrusions 11a and 11b and a set of second protrusions 12a and 12b and protrusions 21a to 21d are formed. In addition to these fixings, the ruled line portions 13a to 13d can be formed in one step. As a result, it is possible to reduce the man-hours in the manufacturing process and realize a significant cost reduction without using advanced manufacturing equipment.

When the mask body 10 and the face seal portion 20 are fixed by ultrasonic welding, and a set of first protrusions 11a and 11b and a set of second protrusions 12a and 12b and protrusions 21a to 21d are fixed. , A plurality of welding marks 14 are formed on the entire circumference of the peripheral edge of these peripheral edges. Further, together with the welding marks 14, a set of welding marks is formed at the boundary between the peripheral edge portion of the mask body 10 and the pair of second protruding portions 12a and 12b, respectively. This set of welding marks becomes the ruled line portions 13a to 13d. In ultrasonic welding, the mold is pressed from the face contact surface side of the face seal portion 20, so that welding marks 14 and welding marks corresponding to the ruled line portions 13a to 13d are formed on the face contact surface of the face seal portion 20, respectively. These are all concave grooves. On the other hand, on the non-contact surface of the face of the mask body 10, welding marks 14 and welding marks corresponding to the ruled line portions 13a to 13d are formed, but these are all convex grooves, and these are thin convex grooves that can be visually recognized. Is.

When a three-dimensional face-contact cushion along the undulations of the face is used as in the disposable dust mask described in Patent Document 1, ultrasonic welding cannot be applied. Since the ultrasonic welding machine that performs ultrasonic welding uses an ultrasonic transducer, the vibration of ultrasonic waves cannot be efficiently transmitted unless it is on a flat surface, and welding with the filter portion is difficult. Therefore, ultrasonic welding is not suitable for welding the three-dimensional face-contact cushion described in Patent Document 1 to the filter portion.

The material of the face seal portion 20 is not particularly limited as long as it can be elastically deformed at least according to the undulations of the nose and cheekbones and has appropriate flexibility. For example, a sheet material having a laminated structure of a foamed elastic layer and a fibrous nonwoven fabric bonded to one surface of the foamed elastic layer can be applied. Such a sheet material includes, for example, a foam elastic layer formed of a foam elastic body having a predetermined elastic restoring property such as urethane foam or polyethylene foam, and a fiber formed of a fibrous nonwoven fabric containing a thermoplastic synthetic fiber. Examples thereof include a sheet material formed by fixing the non-woven fabric layer to each other via an adhesive. In the present embodiment, if the leakage of outside air can be prevented without imposing a burden on the wearer, the above-mentioned sheet material is applied to at least the area in contact with the nose and cheekbones, and a different sheet material is applied to other areas. May be applied.

In the present embodiment, a sheet material in which a closed-cell foam elastic body layer is provided on the face non-contact surface side (inner layer) and a fibrous nonwoven fabric layer is provided on the face contact surface side (outer layer) is applied. By providing the fibrous non-woven fabric layer on the face contact surface side, the face seal portion 20 has a good feel on the skin, is excellent in quick-drying property, and has a reduced sticky feeling on the skin. Further, by providing the foam elastic layer on the non-contact surface side of the face, the foam elastic layer is elastically deformed according to the undulations of the wearer's nose and cheekbones, and the face seal portion 20 fits the face to the outside. In addition to preventing dust from entering, the wearing feeling (wearing feeling) is not impaired even when the tension of one set of tightening strings 30 is small. In this case, one set of tightening strings 30 does not bend, and the dust mask 1 is fixed at a predetermined position on the face and has enough tension to prevent it from slipping off. Further, since the foamed elastic layer is a closed cell and is not breathable, even if the fibrous nonwoven fabric layer is breathable, the outside air does not leak. The face seal portion 20 may be formed of only the foamed elastic layer of closed cells, if necessary.

A set of fastening cords 30 is preferably elastically stretchable and is formed of a known elastic material such as a non-woven fabric, a woven fabric, a plastic film, or a rubber cord. As such an elastic material, for example, round rubber having a circular cross section or flat rubber having a rectangular cross section can be used. In the present embodiment, both ends of one of the tightening strings 30 of the set of tightening strings 30 are fixed to the surfaces of the first set of first projecting portions 11a and 11b, respectively, to form an annular shape without free ends, and the wearing is performed. It can be hung on the top or back of the head of a person. On the other hand, both ends of the other tightening string 30 of one set of tightening strings 30 are fixed to the surfaces of the second set of second protrusions 12a and 12b, respectively, to form an annular shape without free ends, and the wearer's neck. You can hang it on.

The method of fixing the one set of the tightening strings 30 is not particularly limited, and for example, welding by heat, ultrasonic waves, sewing, an adhesive, or the like may be applied. In the present embodiment, both ends of a set of tightening strings 30 are ultrasonically welded to the face non-contact surface side of a set of first protrusions 11a and 11b and a set of second protrusions 12a and 12b, respectively. It was fixed by applying ultrasonic welding. Therefore, welding marks 15 are formed on the face non-contact portions at both ends of the set of tightening strings 30 and on the face contact surfaces of the protruding portions 21a to 21d of the corresponding face seal portions 20. In ultrasonic welding, the mold is pressed from the face non-contact surface side of the mask body 10, so that welding marks 15 (concave grooves) are formed on the face non-contact surfaces at both ends of the set of tightening strings 30, and the protruding portion. The welding marks 15 on the facial contact surfaces of 21a to 21d are thin convex grooves that can be visually recognized.

In the present embodiment, an ultrasonic horn mold (not shown) in which an ultrasonic welding portion (not shown) having a rectangular shape of the welding marks 14 and 15 when the non-contact surface of the face of the mask body 10 is viewed from the front is formed. ) Was used to perform ultrasonic welding of the mask body 10 and the face seal portion, and ultrasonic welding of a set of tightening strings 30, but the present invention is not limited to this. For example, using an ultrasonic horn mold (not shown) having a different shape of the ultrasonic welding portion (not shown) from the above, the shapes of the welding marks 14 and 15 are circular, elliptical, polygonal, etc. It may be provided in a shape that is a combination of shapes. Alternatively, when ultrasonic welding of one set of tightening strings 30 is performed, welding marks 14 and 15 may be formed by performing knurling or the like. The length of the set of tightening strings 30 may be adjusted by using, for example, a known length adjusting mechanism (for example, a buckle) (not shown).

(How to wear a dust mask)
Next, a method of wearing the dust mask 1 of the present embodiment will be described.
5A and 5B are perspective views showing a state before bending a set of second protrusions of a dust mask, and FIG. 5B is a perspective view showing a bent state. FIG. 6 is a view showing a state in which one of the second protrusions in the cross-sectional view taken along the line BB'of FIG. 4 (b) is bent.

First, hold the dust mask 1 in one hand and hang the tightening string 30 on the chin side around the neck to adjust the length to an appropriate level. At this time, as shown in FIG. 5A, the set of first protrusions 11a and 11b and the set of second protrusions 12a and 12b of the dust mask 1 are not bent. Next, the nose and mouth are inserted through the opening 22 of the face seal portion 20 and the dust mask 1 is pressed against the face to adjust the tension of the tightening cord 30 on the jaw side on the neck and dust prevention with one hand. While holding down the mask 1, hang the tightening cord 30 on the nose side over the crown with the other hand and adjust the tension of the tightening cord 30 on the nose side to fix the dust mask 1 so that it does not come off the face. At this time, the first set of first protrusions 11a and 11b of the dust mask 1 does not bend, but as shown in FIGS. 5 (b) and 6 when the tension of the tightening string 30 is applied, one set of first protrusions 11a and 11b Since the second protruding portions 12a and 12b are bent by the ruled line portions 13a to 13d, the dust mask 1 can be brought into close contact with the face.

Here, the dustproof mask 1 is worn on the mannequin M, and the wearing state thereof will be described. At this time, the dust mask 1 adjusts the length of one set of tightening strings 30 and is fixed at a predetermined position on the face.

In FIG. 7, (a) is an enlarged photograph of one first protruding portion of the photograph when the dust mask is worn, and (b) is an enlarged photograph of one second protruding portion. As shown in FIG. 7A, the dust mask 1 has a cheekbone holding structure that wraps the cheekbone as a whole set of the first protruding portions 11a and 11b (one of the first protruding portions 11b is not shown) when worn. Since the face seal portion 20 of the nose and cheekbones is partially elastically deformed, an appropriate pressure is applied around the nose and cheekbones, and the dust mask 1 can be brought into close contact with the face. ..

Further, as shown in FIG. 7B, the dustproof mask 1 has a set of second protrusions 12a and 12b (one second protrusion 12b is not shown) directed outward from the lower side surface side of the peripheral edge portion. To form a bent structure in which the ruled lines 13a to 13d are provided at the boundary with the second protrusions 12a and 12b of the set, the second protrusions 12a and 12b of the set naturally. The dust mask 1 can be brought into close contact with the face without bending and elastically deforming the face seal portions 20 of the cheeks and chin.

The dustproof mask 1 has a set of first protrusions 11a and 11b and a set of first protrusions 11a and 11b due to a cheekbone holding structure of a set of first protrusions 11a and 11b and a bent structure of a set of second protrusions 12a and 12b. Constriction generated between the second protrusions 12a and 12b and formation of distortion in the region corresponding to the cheek to chin of the face seal portion 20 are suppressed, and the stimulation by pressing the face of the face seal portion 20 is greatly suppressed. Can be reduced to.

Then, after wearing the dust mask 1, the adhesion to the face is confirmed. Specifically, it is confirmed by a method using a known device for confirming the quality of adhesion (qualitative method; measuring the leakage rate) or a fit check. Here, the method using a known device for confirming the quality of adhesion is, for example, the method described in Test Example 1 described later. Further, the fit check is a method in which the wearer checks the air leakage from the gap between the dust mask 1 and the face by covering the dust mask 1 with both hands and exhaling. If it can be confirmed that there is no air leakage by such a method, it is judged that the adhesion of the dust mask 1 is good. On the other hand, if there is an air leak, the position of the dust mask 1 and the tension of the set of tightening strings 30 are adjusted. In the present embodiment, as described above, the formation of constriction and distortion of the dust mask 1 is suppressed, so that the adhesion of the dust mask 1 is good.

(Manufacturing method of dust mask)
Next, a method for manufacturing the dust mask 1 of the present embodiment will be described.
8 (a) to 8 (e) are views showing each manufacturing process of the dust mask. 9A and 9B are a back view of the ultrasonic horn mold, and FIG. 9B is a front view of the dust mask before the fastening string is fixed.

First, as shown in FIG. 8A, as a sheet material having good air permeability, a shape-retaining sheet material 100 that retains the shape of the mask body 10 is pressed by a heated press die 200 to form a cup shape (bowl). A shape-retaining cup portion 101 was obtained by molding into a mold).

Next, as shown in FIG. 8B, a filter material 110 that imparts a filter function to the mask body 10 is pushed into the obtained shape-retaining cup portion 101, and the welding portion 211 of the welding device 210 is used. , The shape-retaining cup portion 101 and the pushed filter material 110 were welded to obtain a mask cup material 120. Welding marks 121 were formed at four locations (two locations omitted in the drawing) at the bottom of the mask cup material 120.

Next, as shown in FIG. 8C, a sheet material 130 having a laminated structure of a foamed elastic layer (not shown) and a fibrous nonwoven fabric layer (not shown) bonded to one surface of the foamed elastic layer. (Not shown), the sheet material 130 was cut using a cutting device 220 having a cutting blade 221 having a predetermined shape to form an opening 131, and a face sealing material 132 was obtained.

Next, as shown in FIG. 8D, the obtained face sealing material 132 is positioned and placed on the obtained mask cup material 120, and the face is placed using the welding portion 231 of the welding device 230. The sealing material 132 and the mask cup material 120 were welded and temporarily fastened to obtain a mask precursor 140. Welding marks 141 were formed at two locations on the surface of the mask precursor 140.

Next, as shown in FIG. 8 (e), the obtained mask precursor 140 is placed on the anvil 241 (reception jig) of the ultrasonic welding machine 240 (ultrasonic welder), and ultrasonic waves (not shown) are transmitted. The face sealing material 132 and the mask cup material 120 of the mask precursor 140 were ultrasonically welded using the ultrasonic horn mold 242 of the ultrasonic vibrator connected to the machine. A welding mark 142 formed by the ultrasonic welding part 243 of the ultrasonic horn mold 242 was formed on the surface portion inward of the welding mark 141 of the ultrasonically welded mask precursor 140.

Here, as shown in FIG. 9A, an ultrasonic welding portion 243 is formed on the bottom surface of the ultrasonic horn mold 242 of the ultrasonic welding machine 240. If the surface of the member to be ultrasonically welded has irregularities, the ultrasonic welding portion 243 cannot transmit ultrasonic vibrations, and is suitable for welding a flat member having no irregularities on the surface. Since the welded portion of the face sealing material 132 and the mask cup material 120 of the mask precursor 140 of the present embodiment is flat, an ultrasonic welding machine 240 can be applied.

Further, a in FIG. 9A shows a cut portion (hereinafter, referred to as “cut portion a”) of the obtained mask precursor 140, and this cut portion a shows the outline of the dustproof mask 1. ing. The ultrasonic welding portion 243 is located on the cutting portion a of the mask precursor 140, and is a rectangular first welding portion radially arranged from the cutting portion a toward the peripheral edge of the bottom surface of the ultrasonic horn mold 242. A rectangular second welded portion 245 and a second welded portion 245 arranged along the peripheral edge of the cut portion a corresponding to the region corresponding to the boundary between the 244 and the dustproof mask 1 and the pair of second protruding portions 12a and 12b. It is composed of three welded portions 246. The second welded portion 245 and the third welded portion 246 are arranged apart from each other. The welding mark 142 formed by the first welding portion 244 becomes the welding mark 14 shown in FIG. 1 and the like. Further, the second welded portion 245 and the third welded portion 246 are the ruled line portions 13a to 13d shown in FIG. 1 and the like.

Next, when the mask precursor 140 is cut using a cutting device (not shown) having a cutting blade having a shape that matches the cutting portion a, the dustproof mask precursor 150 shown in FIG. 9B is obtained. The dust mask precursor 150 is the one before welding a set of the tightening cords 30, and has a shape that matches the cut portion a in the front view. Note that b in the figure indicates a position where both ends of a set of tightening cords 30, which will be described later, are welded (hereinafter, referred to as “braided cord attachment position b”).

Next, with respect to the obtained dust mask precursor 150, both ends of a set of tightening cords 30 were positioned at the braided cord attachment positions b shown in FIG. 9B, and welded by an ultrasonic welding machine (not shown). The dust mask 1 is obtained by fixing the dust mask 1.

Next, the present invention will be described in more detail with reference to the following examples.

(Example)
In the example, the dust mask 1 (see FIGS. 1 to 3) of the first embodiment was produced by the procedure shown below. In the examples, the manufacturing method of the dust mask 1 of the second embodiment (see FIGS. 8 (a) to 8 (e) and FIGS. 9 (a) and 9 (b)) was referred to.

First, a polypropylene-based spunbonded non-woven fabric (PPSB non-woven fabric) and a polyethylene terephthalate non-woven fabric (PET non-woven fabric) are laminated, pressed with a heated press die 200, molded into a cup shape (bowl shape), and a shape-retaining cup. Part 101 was obtained. Next, the filter material 110 in which the polypropylene-based melt blown non-woven fabric (PPMB non-woven fabric) and the PPSB non-woven fabric are laminated is pushed into the obtained shape-retaining cup portion 101, and the shape-retaining cup portion 101 and the shape-retaining cup portion 101 are used by the welding device 210. The pressed filter material 110 was welded at four points to obtain a mask cup material 120. Next, a sheet material 130 in which a polypropylene-based spunlace non-woven fabric was attached to a polyethylene-based foamed elastic layer was cut out to form an opening 131 to obtain a face seal material 132. The obtained face seal material 132 was positioned and placed on the mask cup material 120, and the outer edge portion was temporarily welded at two points to obtain a mask precursor 140. Next, the face sealing material 132 of the mask precursor 140 and the mask cup material 120 were welded using an ultrasonic welding machine 240. At this time, a welding mark 142 formed by the ultrasonic welding portion 243 of the ultrasonic horn mold 242 of the ultrasonic welding machine 240 was formed on the peripheral portion of the mask precursor 140. Next, using a cutting device (not shown) having a cutting blade having a shape that matches the cutting portion a, the peripheral portion of the mask precursor 140 is cut to obtain a dust-proof mask precursor 150, and then the dust-proof mask precursor 150 is obtained. Both ends of a set of tightening cords 30 were ultrasonically welded to the braided cord attachment position b of the above, and a dust mask 1 was obtained.

(Comparison example)
In the comparative example, one set of first protrusions 11a and 11b and one set of second protrusions 12a and 12b of the dustproof mask 1 (hereinafter referred to as "mask of example") produced in the example are bent. It was fixed so as not to be present, and a dustproof mask (hereinafter referred to as "comparative example mask") was prepared.

(Test Example 1: Measurement of leakage rate)
The leakage rates of both were measured using the mask of the example and the dust mask of the comparative example. In Test Example 1, the calculation of the leakage rate specified in Article 7, Paragraph 3, Item 2 of the Dust Mask Standards established based on the provisions of Article 42 of the Industrial Safety and Health Act (Act No. 57 of 1972). Based on the method, one subject was selected from each face category shown in Table 1 below, and a total of 10 subjects were designated as subjects a to j.

A labor research type mask fitting tester (manufactured by Shibata Scientific Technology Co., Ltd., MT-05 type) was used as a measuring machine for measuring the leakage rate. Subjects a to j shown in Table 1 above wore the masks of Examples and the masks of Comparative Examples and breathed. At this time, atmospheric dust of 0.3 μm to 0.5 μm was used as the target particle, and the leakage rate was measured by the ratio of the number of observed particles outside and inside each mask, and the results are shown in Table 2 below.

When the outside air containing the target particles (outside each mask) passes through the filter portion (mask body 10) of each mask, the target particles are efficiently filtered by the filter portion. When the target particles are filtered, the target particles in each mask are measured less than the target particles outside each mask (atmosphere) by the above-mentioned measuring machine, and the leakage rate becomes small. On the other hand, when the outside air leaks from the gap between each mask and the face, the target particles are not filtered, so that the target particles in each mask increase and the leakage rate increases. Therefore, the smaller (or larger) the leakage rate, the higher (or lower) the adhesion between each mask and the face. The measuring machine used the following formula (1) when calculating the leakage rate of each mask.

Leakage rate (%) = (Ni / No) x 100 ... (1)
(In the formula, Ni is the number of target particles in each mask, and No is the number of target particles outside each mask.)

As shown in Table 2 above, the masks of the examples had a reduced leakage rate of all the subjects a to j as compared with the masks of the comparative examples. That is, it was clarified that the mask of the example enhances the adhesion between the mask and the face when worn as compared with the mask of the comparative example.

(Test Example 2: Sensory test)
Interview survey to see if subjects a to j shown in Table 1 feel discomfort, pain, or other oppressive feeling or leakage feeling to the cheeks and chin when wearing the mask of the example and the mask of the comparative example. The results are shown in Table 3 below.

As shown in Table 3 above, 9 out of 10 subjects felt oppressive or leaky when wearing the mask of the comparative example. It was suggested that this result correlates with the measurement result of the leakage rate shown in Table 2 above. In particular, no subject felt a feeling of leakage on the cheek when wearing the mask of the example, while seven subjects felt a feeling of leakage on the cheek when wearing the mask of the comparative example. From this result, the effect of forming the cheekbone holding structure on the mask of the example was suggested. That is, in the mask of Example 1, the face seal portion 20 of the nose and cheekbones is elastically deformed, so that appropriate pressure is applied around the nose and cheekbones, and the mask can be brought into close contact with the face. It is probable that few subjects felt the feeling of leakage.

In addition, while one subject felt a chin leak when wearing the mask of the example, three subjects felt a chin leak when wearing the mask of the comparative example. .. From this result, the effect of forming a bent structure on the mask of the example was suggested. That is, in the mask of the first embodiment, one set of the second protruding portions 12a and 12b bends naturally, and the mask is brought into close contact with the face without elastically deforming the face seal portions 20 of the wearer's cheeks and chin. It is probable that there were few subjects who were able to do so and felt a sense of leakage in their jaws.

Furthermore, since the number of subjects who felt oppressive feeling (complained of discomfort) when wearing each mask was larger in the comparative examples than in the examples, the reduction of the oppressive feeling was reduced by the above-mentioned cheekbones in the masks of the examples. It was suggested that the effect was due to the formation of the part-holding structure and the above-mentioned bent structure. That is, in the mask of Example 1, the pressure on the face by the face seal portion 20 can be adjusted by causing the face seal portion 20 to be elastically deformed according to the facial portion, and the subject feels oppressive feeling. It is probable that there were few.

(Other embodiments)
The dust mask of the present invention is not limited to the above configuration as long as it has a cheekbone holding structure or a bent structure, and can be appropriately designed as needed. Hereinafter, other embodiments of the dust mask of the present invention will be described.

In FIG. 10, (a) and (b) are front views of dust masks of other embodiments. The dust mask 1A shown in FIG. 10 (a) has the same configuration as the dust mask 1 of the first embodiment, except that one set of fasteners 30A is provided with one set of fasteners 40A. It is a thing. When worn, the dust mask 1A holds the mask body 10A of the dust mask 1A while covering the nose and the jaw, and attaches the tightening cord 30A on the nose side to the crown and the tightening cord 30A on the jaw side. It is possible to adjust the length of a set of tightening strings 30A with a set of fixtures 40A around the neck. According to the dust mask 1A, since one set of the tightening cords 30A is not applied to the ears, the burden on the ears is reduced, and the discomfort such as itching and pain caused by the one set of the tightening cords 30A is reduced. Can be done. Further, since one set of fixtures 40A is an adjuster, the length of one set of tightening cords 30A can be easily adjusted, and the dust mask 1A can be fixed at a predetermined position on the face. The dust mask 1A may be configured such that one fixture 40A is provided on either one of the pair of tightening strings 30A.

Further, the dust mask 1B shown in FIG. 10B is of the first embodiment except that it is a side hook type in which a fixture 50B is provided on one of the tightening strings 30B of one set of tightening strings 30B. It has the same configuration as the dust mask 1. When worn, this dustproof mask 1B covers the nose and jaw, holds down the mask body 10B of the dustproof mask 1B, turns a set of tightening cords 30B to the back of the head, and fixes one of the tightening cords 30B. The other tightening string 30B is hooked and fixed to the hook portion 51B of the 50B, and the length of one tightening string 30B can be adjusted by the adjuster portion 52B of the fixture 50B. According to the dust mask 1B, since one set of the tightening cords 30B is not hung on the ears, the burden and discomfort on the ears can be reduced, and the length of one tightening cord 30B is reduced by the fixture 50B. The dust mask 1B can be fixed at a predetermined position on the face. The dust mask 1B may be configured such that a set of fixtures 50B is provided on a set of tightening strings 30B.

11 (a) to 11 (c) are front views of dust masks of other embodiments. For convenience of explanation, in FIG. 11A, a part of one set of tightening cords 30C is omitted. The dustproof mask 1C shown in FIG. 11A has the same configuration as the dustproof mask 1 of the first embodiment except that the mask main body 10C is provided with an exhaust valve 60C, and is shown in FIG. 11B. The dustproof mask 1D has the same configuration as the dustproof mask 1A except that the exhaust valve 60D is provided on the mask body 10D. The dustproof mask 1E shown in (c) has an exhaust valve on the mask body 10E. It has the same configuration as the dust mask 1B except that 60E is provided.

In these dust masks 1C to 1E, the exhaust valves 60C to 60E are closed at the time of intake and the exhaust valves 60C to 60E are opened at the time of exhalation. be able to. The dust masks 1C to 1E are exhaust valves 60C to 60E, and the valve (not shown) closes at the time of inspiration to prevent the inhalation of outside air, and the valve opens at the time of exhalation to prevent the retention of exhaled air in the dust masks 1C to 1E and discharge moisture. A one-way valve having a configuration is applied, but the configuration is not limited to this configuration. For example, a valve having a configuration in which an exhaust valve opens with the center as a fulcrum and discharges exhaled air concentrically, or a valve having a configuration in which an exhaust valve opens with one side as a fulcrum and discharges exhaled air to increase the amount of one discharge is applied. You may. The number and positions of the exhaust valves 60C to 60E provided on the dust masks 1C to 1E are not particularly limited, and can be appropriately designed as needed.

The present invention relates to fine dust such as pollen, yellow sand, and car exhaust gas; extremely fine scattered particulate matter with a particle size of 2.5 μm or less called PM2.5; fine particulate matter such as harmful substances that adversely affect the human body. As a protective measure against substances, it is useful not only at welding sites, polishing / cutting workshops, construction sites where crushing work is performed, research facilities, etc., but also as dustproof masks, especially disposable dustproof masks, which are used in daily life.

1,1A, 1B, 1C, 1D, 1E Dust-proof mask 10,10A, 10B, 10C, 10D, 10E, Mask body 11a, 11b First protrusion 12a, 12b Second protrusion 13a, 13b, 13c, 13d Ruled line 14,15,121,141,142 Welding marks 20 Face seal part 21a, 21b, 21c, 21d Protruding part 22,131 Opening part 30, 30A, 30B, 30C Fastener 40A, 50B Fixture 51B Hook part 52B Adjuster part 60C , 60D, 60E Exhaust valve 100 Shape-retaining sheet material 101 Shape-retaining cup part 110 Filter material 120 Mask cup material 130 Sheet material 132 Face sealing material 140 Mask precursor 150 Dust-proof mask precursor 200 Press mold 210, 230 Welding device 211, 231 Welding part 220 Cutting device 221 Cutting blade 240 Ultrasonic welding machine 241 Anvil 242 Ultrasonic horn mold 243 Ultrasonic welding part 244 1st welding part 245 2nd welding part 246 3rd welding part M Mannequin a Cutting part b Braid attachment position

Claims (7)

The mask body, which is formed by bulging into a cup shape except for the peripheral part,
A dustproof mask comprising a face seal portion in which the peripheral edge of the outer peripheral edge portion is fixed to a part of the peripheral edge portion of the peripheral edge portion of the mask body and the inner peripheral edge portion projects inward.
A set of first protrusions protruding outward from the upper end of the side surface of the peripheral edge of the mask body, and a set of first protrusions.
A set of second protrusions that radiate outward from the lower end of the side surface of the peripheral edge of the mask body, and a pair of second protrusions.
A ruled line portion formed of a concave groove recessed from the face seal portion side surface of the pair of second protrusions over the boundary between the peripheral edge portion of the mask body and the set of second protrusions. A dust mask characterized by having,. The dust mask according to claim 1, wherein the mask body, the first set of first protrusions, and the first set of second protrusions are integrally molded from a sheet material. In the face seal portion, the peripheral edge of the outer peripheral edge portion is fixed to the entire circumference of the peripheral edge portion of the peripheral edge portion of the mask body, and the inner peripheral edge portion projects inward to surround the area corresponding to the nose portion and the mouth portion. The dust mask according to claim 1 or 2, wherein an opening is formed. The face seal portion is formed on a set of third protrusions and a set of second protrusions, each of which projects radially outward from the peripheral edge of the outer peripheral edge corresponding to the set of first protrusions. It has a set of fourth protrusions, each of which protrudes outwardly from the peripheral edge of the corresponding outer peripheral edge.
The peripheral edge of the peripheral edge of the first set of third protrusions is fixed to the peripheral edge of the peripheral edge of the first set of protrusions, and the peripheral edge of the peripheral edge of the fourth set of fourth protrusions is fixed to the peripheral edge of the first set of protrusions. The dust mask according to any one of claims 1 to 3, wherein the dust mask is fixed to the peripheral edge of the peripheral edge of the second protruding portion. 4. The face seal portion, the set of third protrusions, and the set of fourth protrusions are integrally molded from a sheet material made of a foamed elastic body. Dustproof mask described in. Claims 1 to 5, wherein the ruled line portions are separated from each other and are composed of two concave grooves recessed from the surface of the pair of second protruding portions on the face seal portion side. The dust mask according to any one of the items. Provided with a pair of lacing cords, each with two fixed ends,
One of the pair of tightening cords has two fixed ends fixed to the first set of protrusions, and the other has two fixed ends fixed to the set of second protrusions. The dust mask according to any one of claims 1 to 6, wherein the dust mask is characterized by the above.

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