Patent Publication Number: US-2021162244-A1

Title: Dustproof mask and manufacturing method thereof

Description:
TECHNICAL FIELD 
     The present invention relates to a dustproof mask and a method of manufacturing the same, and more specifically, to a dustproof mask including a mask body of which an edge is brought into close contact with a user&#39;s face and an air filter part which is provided separately, is detachably coupled to an outer side of the mask body, is filled with purified external air, and has a sealed pouch shape, thereby allowing the purified external air to be supplied to a user during inhalation and allowing air generated during exhalation to be discharged to the outside so that inhalation of contaminants contained in external air is prevented and uncomfortable breathing due to mask wearing is minimized, and a method of manufacturing the same. 
     BACKGROUND ART 
     Masks according to the conventional art have a structure covering a user&#39;s face using a contaminant filtration cloth, however, since the filtration cloth of the mask is brought into close contact with a respiratory part such as a user&#39;s mouth or nose, there are disadvantages in that breathing is uncomfortable and contaminants easily penetrate the filtration cloth. 
     Accordingly, in order to solve such problems of the conventional art, a dustproof mask having a structure similar to that of a gas mask, in which a dustproof filter is installed around a front or side surface of the mask so that a user inhales only air filtered by the dustproof filter, has been recently developed as described in Document 1. 
     However, in the case of the dustproof mask, since a shape is similar to that of the gas mask in addition to the complex structure and a high price, when a general user or industrial worker wears the dustproof mask, activity is excessively restricted, and thus there is a problem of greatly lowering practicality. 
     DOCUMENT 1 
     Korean Utility Model No. 2009-0010452 (Publication Date: Oct. 14, 2009) 
     TECHNICAL PROBLEM 
     The present invention is directed to providing a dustproof mask including a mask body of which an edge is brought into close contact with a user&#39;s face and an air filter part which is provided separately, is detachably coupled to an outer side of the mask body, is filled with purified external air, and has a sealed pouch shape, thereby allowing the purified external air to be supplied to a user during inhalation, and allowing air generated during exhalation to be discharged to the outside so that inhalation of contaminants contained in external air is prevented even with a simple structure, mixing of inhaled air and exhaled air is minimized and uncomfortable breathing due to mask wearing is significantly reduced, and a method of manufacturing the same. 
     The present invention is also directed to providing the dustproof mask in which the air filter part is installed to be spaced apart from an outer surface of the mask body by a predetermined distance so that external air is introduced into the air filter part through an air passage formed by a separation space between the air filter part and the mask body in addition to passing through the front of the air filter part so that an area through which external air is introduced into the air filter part is significantly increased so as to further reduce uncomfortable breathing of the user, and a method of manufacturing the same. 
     Technical Solution 
     One aspect of the present invention provides a dustproof mask including a mask body which is adapted to cover a user&#39;s face and forms a breathing space between an inner surface thereof and the user&#39;s face, wherein breathing of a user&#39;s respiratory system is performed through the breathing space, an air filter part disposed in front of the mask body, coupled to one side of an outer surface of the mask body, configured to be filled with external air which passes through an outer surface thereof formed of a filter material and contaminants therein are removed, and having a sealed pouch shape, an intake valve part installed in a coupled portion of the mask body and the air filter part and operated to supply the air inside the air filter part to the breathing space during inhalation, and an exhaust valve part installed on the other side of the outer surface of the mask body and operated to discharge air inside the breathing space to the outside during exhalation, wherein the air filter part is coupled to be spaced apart from the outer surface of the mask body so that an air passage through which external air flows is formed between the air filter part and the mask body. 
     Another aspect of the present invention provides a method of manufacturing the dustproof mask, the method including (a) forming an air filter part having a sealed pouch shape, (b) forming a mask body having a dome shape in which an intake hole and an exhaust hole formed in an outer surface thereof are coupled to an intake valve part and an exhaust valve part, respectively, and (c) coupling the air filter part disposed in front of the mask body to the outer surface of the mask body, wherein the step (a) includes (a1) forming a first filter member having a dome shape, (a2) forming a second filter member in which a through hole is formed in an central portion thereof and which has a dome shape, and (a 3 ) bonding edge portions of the first filter member and the second filter member to form a sealed pouch shape in which a space filled with external air introduced through the first filter member and the second filter member is formed. 
     Still another aspect of the present invention provides a method of manufacturing a dustproof mask including a mask body brought into close contact with a user&#39;s face and an air filter part detachably coupled to an outer side of the mask body and having a pouch shape, the method including (a) preparing a filter member having a sheet shape, (b) forming an intake hole at one side of the filter member, (c) dividing the filter member into a first region in which the intake hole is formed and a second region which is the remaining region and folding the filter member such that a length of the second region is greater than a length of the first region, and (d) bonding edge portions, where outer end portions of the first region and the second region are in contact with each other, to form a space having a pouch shape therein so that the air filter part is manufactured. 
     Advantageous Effects 
     As described above, in a dustproof mask and a method of manufacturing the same according to the present invention, since a mask body of which an edge is brought into close contact with a user&#39;s face and an air filter part which is detachably coupled to an outer side of the mask body, is filled with purified external air, and has a sealed pouch shape are separately provided to allow the purified air to be supplied to a user during inhalation and allow air generated during exhalation to be discharged, there is an advantage of preventing inhalation of external contaminants during breathing even using the dustproof mask with a simple structure. 
     In addition, in the dustproof mask and the method of manufacturing the same according to the present invention, since mixing of inhaled air and exhaled air is minimized in a breathing space, which is a sealed space between the mask body and the user&#39;s face, due to the above-described structure, and a method of inhaling the purified air filling the air filter part in advance during inhalation is used, there is an advantage in that uncomfortable breathing due to mask wearing can be further reduced than a mask according to the conventional art which requires inhaling external air through a vent hole of a mask body for every breath. 
     In addition, in the dustproof mask and the method of manufacturing the same according to the present invention, since the air filter part is installed to be spaced apart from an outer surface of the mask body by a predetermined distance so as to introduce external air into the air filter part through an air passage formed in a separation space between the air filter part and the mask body in addition to passing through the front of the air filter part, an area through which external air is introduced into the air filter part is significantly increased, and thus there is an advantage in that uncomfortable breathing of the user can be further reduced. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating an entire structure of a dustproof mask according to a first embodiment of the present invention. 
         FIG. 2  is a view illustrating a state in which the dustproof mask illustrated in  FIG. 1  is worn. 
         FIG. 3  is a cross-sectional view taken along line A-A of  FIG. 2 . 
         FIGS. 4 and 5  are detailed enlarged views illustrating a portion A and a portion B of  FIG. 3 , respectively. 
         FIG. 6  is a set of views illustrating an operation state of the dustproof mask illustrated in  FIG. 1 . 
         FIG. 7  is a process flowchart for describing a method of manufacturing the dustproof mask illustrated in  FIG. 1 . 
         FIG. 8  is a set of views for describing a method of manufacturing an air filter part of  FIG. 1  according to a second embodiment of the present invention. 
         FIGS. 9 and 10  are a set of views for describing a method of manufacturing an air filter part of  FIG. 1  according to a third embodiment of the present invention and a set of cross-sectional views taken along line B-B of  FIG. 9  for describing a use state, respectively. 
         FIGS. 11 and 12  are a set of views for describing a method of manufacturing an air filter part of  FIG. 1  according to a fourth embodiment of the present invention and a set of cross-sectional views taken along line C-C of  FIG. 11  for describing a use state, respectively. 
         FIG. 13  is a perspective view illustrating a structure of a dustproof mask according to a fifth embodiment of the present invention. 
         FIG. 14  is a view illustrating a state in which the dustproof mask illustrated in  FIG. 13  is worn. 
         FIG. 15  is a cross-sectional view taken along line D-D of  FIG. 14 . 
         FIG. 16  is a set of views for describing a method of manufacturing the dustproof mask according to the fifth embodiment of the present invention. 
     
    
    
     MODES OF THE INVENTION 
     Hereinafter, exemplary embodiments of the present invention will be specifically described with reference to the accompanying drawings. 
     First Embodiment 
     As illustrated in  FIGS. 1 to 3 , a dustproof mask according to the present invention is formed to include a mask body  10  which is adapted to cover a user&#39;s face F and forms a breathing space  20  between an inner surface thereof and the user&#39;s face F, an air filter part  30  disposed in front of the mask body  10  and coupled to one side of an outer surface of the mask body  10 , and air guide members  40  and  50  operated to supply air inside the air filter part  30  to the breathing space  20  during inhalation and discharge air inside the breathing space  20  to the outside during exhalation. 
     In this case, the mask body  10 , similar to a general mask, performs a function of preventing contaminants such as yellow dust, particles, and motes contained in external air from being directly introduced into a user&#39;s respiratory system, and may be made of a cloth material, such as cotton or a non-woven fabric, or a synthetic resin material such as silicone or polyester. 
     In addition, an edge portion of the mask body  10  may also be formed of a shape memory material capable of maintaining a changed shape along a curve of the user&#39;s face F so as to be easily brought into close contact with the user&#39;s face F. 
     In addition, the mask body  10  according to the present invention may be made of an impermeable material such as a synthetic resin to introduce external air filling the air filter part  30  in a state in which contaminants are removed into the breathing space  20  during inhalation as will be described below, and in a case in which the mask body  10  is formed of a cloth material such as a non-woven fabric, the outer surface of the mask body  10  may be coated with an impermeable material such as silicone. 
     In addition, the edge portion of the mask body  10  may further include a close-contact member  12  for closer contact with the user&#39;s face F, and due to the above-described structure, the breathing space  20  in which breathing is performed in the mask body  10  by the user&#39;s respiratory system may be formed as a sealed space separated from the outside (that is the outside of the mask body). 
     Meanwhile, the air filter part  30  is disposed in front of the mask body  10 , coupled to one side of the outer surface of the mask body  10 , and formed such that external air fills an inner space  35  through the outer surface thereof exposed to the outside. 
     To this end, the outer surface of the air filter part  30  is formed of a filter material capable of filtering the contaminants contained in external air, and the external air in a state, in which the contaminants are removed after passing through the outer surface of the air filter part  30 , fills the inner space  35  of the air filter part  30 . 
     In addition, the air filter part  30  is detachably coupled to one side of the outer surface of the mask body  10  through the described-below method, and a rear surface thereof facing the mask body  10  is installed to be spaced apart from the outer surface of the mask body  10  by a predetermined distance so that an air passage  36  through which external air flows is formed between the air filter part  30  and the mask body  10 . 
     In this case, a plurality of spacers  11  having rib shapes to maintain the predetermined separation distance from the air filter part  30  may be formed on the outer surface of the mask body  10 . 
     Due to the above-described structure, in the dustproof mask according to the present invention, since the air filter part  30  is installed to be spaced apart from the outer surface of the mask body  10  by the predetermined distance so that external air is introduced into the air filter part  30  through the air passage  36  formed by the separation space between the air filter part  30  and the mask body  10  in addition to passing though the front of the air filter part  30 , an area through which the external air is introduced into the air filter part  30  is significantly increased. 
     Accordingly, in the dustproof mask according to the present invention, since the area through which external air is introduced is increased, external air may easily fill the inner space  35  of the air filter part  30 , and thus there is an advantage in that uncomfortable breathing of the user due to mask wearing can be reduced when compared to a mask according to the conventional art. 
     In this case, the air filter part  30  may be formed to have any shape as long as it performs the same function but may be more preferably formed to have a shape corresponding to a shape of the outer surface of the mask body  10 . 
     As an example of the present embodiment, the outer surface of the mask body  10  is formed to have a convex dome shape in a forward direction of the user&#39;s face F, and a front surface, which is exposed to the outside, and the rear surface, which faces the outer surface of the mask body  10 , of the air filter part  30  are formed to have convex dome shapes in the forward direction of the user&#39;s face F, but curvatures of the front surface and the rear surface of the air filter part  30  may be formed to be different so as to secure the inner space  35  of the air filter part  30 . 
     In addition, the air filter part  30  may be formed of a single member having a pouch shape but, as an example of the present embodiment, the air filter part  30  is formed to include a first filter member  31  disposed in front of the mask body  10  and a second filter member  32  disposed between the mask body  10  and the first filter member  31 . 
     In this case, an edge portion of the first filter member  31  and an edge portion of the second filter member  32  are bonded to form first bonded portions  33   a  so that a sealed pouch shape is formed, and the first and second filter members  31  and  32  may be bonded using a thermal bonding method, an ultrasonic welding method, or a method using an adhesive. 
     According to the above-described structure, the first filter member  31  removes contaminants contained in external air introduced through the front of the air filter part  30 , and the second filter member  32  removes contaminants contained in external air introduced through the air passage  36 . 
     In addition, a plurality of separating protrusions  32   d  may be formed to protrude from an inner surface of the second filter member  32  to prevent the inner space  35  filled with external air from contracting by inner surfaces of the first and second filter members  31  and  32  coming into contact with each other, and the separating protrusions  32   d  may be formed on the inner surface of the first filter member  31  or both of the inner surfaces of the first and second filter members as necessary. 
     In addition, unlike the present embodiment, the separating protrusions  32   d  may also be formed as separate members and interposed between the first filter member  31  and the second filter member  32  as necessary. 
     In addition, the separating protrusions  32   d  may be formed of a spring type material or have a shape having an elastic force as necessary so that, after a distance between the first filter member  31  and the second filter member  32  is decreased (that is, after a volume of the inner space is decreased) while air in the inner space  35  is introduced into the breathing space  20  during inhalation, the distance between the first filter member  31  and the second filter member  32  is increased by the elastic restoring force of the separating protrusions  32   d,  and thus introduction of external air can be further facilitated. 
     In this case, end portions of the separating protrusions  32   d  may also be formed to be in contact with the inner surface of the filter member (in the case of the present invention, first filter member) facing the end portions in a state in which the distance between the first filter member  31  and the second filter member  32  is not decreased (that is, a normal state in which inhalation is not performed). 
     In addition, in the case of the first filter member  31  and the second filter member  32 , the first filter member  31  and the second filter member  32  are formed of an elastic material or have a shape having an elastic force so that, after the first filter member  31  and the second filter member  32  are deformed in directions in which the volume of the inner space  35  is decreased by inhalation, the shapes thereof are restored by the elastic restoring force thereof to increase the volume of the inner space  35 , and thus introduction of external air can be further facilitated. 
     In addition, in order to couple the air filter part  30  and the mask body  10  and to supply air filling the inner space  35  of the air filter part  30  to the breathing space  20  during inhalation as will be described below, a first intake hole  32   a  communicating with the inner space  35  of the air filter part  30  and a first coupling member  32   b  having a tubular shape and protruding outward from an edge of the first intake hole  32   a  are formed in a central portion of the second filter member  32  as illustrated in  FIG. 4 . 
     In this case, a coupling groove  32   c  may be formed in an inner circumferential surface of the first coupling member  32   b  to be coupled to the mask body  10  as will be described below. 
     In addition, the first coupling member  32   b  may be firmly coupled to the edge portion of the first intake hole  32   a  using a thermal bonding method, an ultrasonic welding method, or a method using an adhesive, but may be coupled thereto in a detachable manner so as to be replaceable as necessary. 
     In addition, second bonded portions  33   b  where the first filter member  31  and the second filter member  32  are partially bonded may be formed in end portions of both sides of the air filter part  30  to be coupled to wearing straps  60 , and as an example of the present embodiment, the second bonded portions  33   b  are formed to be connected to the first bonded portions  33   a  at the end portions of both sides of the air filter part  30 . 
     In this case, the wearing straps  60  may be formed as straps or bands hooked and worn on both ears or a head of the user, and as an example of the present embodiment, the wearing straps  60  are formed to be hooked and worn on both ears of the user. 
     As described above, in a case in which the user wears the dustproof mask using the wearing straps  60 , an edge of the mask body  10  is brought into close contact with the user&#39;s face F by the close-contact member  12 , and an edge (that is, in the case of the present invention, first bonded portion) of the air filter part  30  is spaced apart from the user&#39;s face F so that the air passage  36  can be maintained. 
     Meanwhile, the air guide members  40  and  50  include the intake valve part  40  that guides or blocks external air filling the inner space  35  of the air filter part  30  to or from the breathing space  20  and the exhaust valve part  50  that guides or blocks air inside the breathing space  20  to or from the outside. 
     In order to install the intake valve part  40  and the exhaust valve part  50 , a second intake hole  41  communicating with the breathing space  20  and a second coupling member  42  protruding from an edge of the second intake hole  41  and having a tubular shape are formed at one side of the outer surface of the mask body  10 , and an exhaust hole  51  communicating with the breathing space  20  and an exhaust valve housing member  52  protruding from an edge of the exhaust hole  51  and having a tubular shape are formed at the other side of the outer surface of the mask body  10 . 
     In the case of the present invention, as an example, the second intake hole  41  is formed in a central portion of the mask body  10  at a position corresponding to the first intake hole  32   a,  and the exhaust hole  51  is formed in a lower portion of the mask body  10 . 
     In this case, a coupling protrusion  42   a  having a shape corresponding to the coupling groove  32   c  is formed on an outer circumferential surface of the second coupling member  42 , and the first and second coupling members  32   b  and  42  are coupled by coupling of the coupling groove  32   c  and the coupling protrusion  42   a  so that the air filter part  30  is detachably coupled to the mask body  10 . 
     In this case, the coupling groove  32   c  and the coupling protrusion  42   a  may be formed to have annular shapes and may be formed to have a plurality of groove-protrusion structures spaced apart from each other as necessary. 
     Due to the above-described structure, external air filling the inner space  35  of the air filter part  30  is introduced into the breathing space  20  through a coupled portion of the first and second coupling members  32   b  and  42  formed to have the tubular shapes. 
     In this case, the intake valve part  40  is installed in a coupled portion of the mask body  10  and the air filter part  30 , that is, the coupled portion of the first and the second coupling members  32   b  and  42  and is operated to allow air inside the air filter part  30  to be supplied to the breathing space  20  during inhalation, and as an example of the present embodiment, the intake valve part  40  is formed to be installed between two ends of the second coupling member  42  but may also be installed between two ends of the first coupling member  32   b  as necessary. 
     In the case of the present invention, the intake valve part  40  is formed to include an intake valve sheet  40   a  formed between two ends of the second coupling member  42  and having a mesh shape, an intake valve  40   b  seated on the intake valve sheet  40   a  to be opened during inhalation, and an intake valve fixing member  40   c  fixing the intake valve  40   b  to one side of the intake valve sheet  40   a.    
     Due to the above-described structure, as illustrated in  FIG. 6A , the intake valve  40   b  is operated to be opened by an inhalation force of the user&#39;s respiratory system during inhalation, and as illustrated in  FIG. 6B , is operated to be closed by a pressure of air discharged from the user&#39;s respiratory system and an elastic force thereof during exhalation. 
     To this end, the intake valve  40   b  may be formed of a material or to have a structure having a certain extent of an elastic restoring force like an exhaust valve  50   b  which will be described below. 
     In addition, the exhaust valve part  50  is operated to allow air inside the breathing space  20  to be discharged to the outside during exhalation, and to this end, the exhaust valve part  50  is formed to include an exhaust valve sheet  50   a  formed between two ends of the exhaust valve housing member  52  and having a mesh shape, the exhaust valve  50   b  seated on the exhaust valve sheet  50   a  to be opened during exhalation, and an exhaust valve fixing member  50   c  fixing the exhaust valve  50   b  to one side of the exhaust valve sheet  50   a.    
     Due to the above-described structure, as illustrated in  FIG. 6A , the exhaust valve  50   b  is closed by an inhalation force of the user&#39;s respiratory system and an elastic force thereof during inhalation, and as illustrated in  FIG. 6B , is operated to be opened by a pressure of air discharged from the user&#39;s respiratory system during exhalation, wherein the exhaled air discharged from the exhaust valve  50   b  is discharged to the outside through the air passage  36 . 
     As an example of the present embodiment, the intake valve  40   b  and the exhaust valve  50   b  are formed as flip valve types of which central portions are fixed to the intake valve sheet  40   a  and the exhaust valve sheet  50   a  but may be formed to have any form as long as the same functions are performed. 
       FIG. 7  is a process flowchart for describing a method of manufacturing the dustproof mask illustrated in  FIG. 1 . In the case of the dustproof mask according to the present invention, the first filter member  31  and the second filter member  32  having dome shapes are formed first (S 1  and S 2 ). 
     In this case, when the first and second filter members  31  and  32  are formed of a filter material such as a non-woven fabric, steps S 1  and S 2  are performed using a thermoforming method, and in the case of step S 2 , before and after thermoforming, a process of punching the first intake hole  32   a  in the second filter member  32  and a process of coupling the edge portion of the first intake hole  32   a  and the first coupling member  32   b  using a thermal bonding method and the like are additionally performed. 
     In addition, when steps S 1  and S 2  are completed, the edge portions of the first and second filter members  31  and  32  are bonded together to form the first bonded portion  33   a  so as to form the air filter part  30  having the sealed pouch shape (S 3 ), the bonding of the first and second filter members  31  and  32  may be achieved using a thermal bonding method, an ultrasonic welding method, or a method using an adhesive as described above. 
     In addition, in step S 3 , a process of forming the second bonded portions  33   b  in the end portions of both sides of the air filter part  30  to couple the wearing straps  60  and a process of coupling the second bonded portions  33   b  and the wearing straps  60  are additionally performed. 
     Meanwhile, as described above, when steps S 1  to S 3  are completed, the mask body  10  is formed (S 4 ), and in a case in which the mask body  10  is formed of an impermeable synthetic resin material such as silicone as described above, step S 4  may be performed by a general injection process. 
     In addition, in a case in which the mask body  10  is formed of a cloth material such as a non-woven fabric, after the mask body  10  is formed to have the dome shape by a thermoforming process or the like, a process of coating the outer surface of the mask body  10  with an impermeable material may be additionally performed. 
     In this case, in step S 4 , before and after forming the mask body  10 , a process of punching the second intake hole  41  and the exhaust hole  51  is additionally performed. 
     In addition, when step S 4  is completed, edge portions of the second intake hole  41  and the exhaust hole  51  are coupled to the second coupling member  42  and the exhaust valve housing member  52 , respectively, so that the mask body  10  is coupled to the intake valve part  40  and the exhaust valve part  50  (S 5 ). 
     In this case, the intake valve part  40  and the exhaust valve part  50  formed to have tubular shapes are installed between two ends of the second coupling member  42  and two ends of the exhaust valve housing member  52 , respectively, and more preferably, the second coupling member  42  and the intake valve part  40 , and the exhaust valve housing member  52  and the exhaust valve part  50  may be provided as integrated module types to be connectable to the edge portions of the second intake hole  41  and the exhaust hole  51 , respectively. 
     In this case, a process of respectively coupling the edge portions of the second intake hole  41  and the exhaust hole  51  to the second coupling member  42  and the exhaust valve housing member  52  may be preferably performed, for example, by an insert-injection method in the case in which the mask body  10  is formed of the synthetic resin material, or may be preferably performed, for example, by a thermal bonding method, an ultrasonic welding method, or a method using an adhesive in the case in which the mask body  10  is formed of the cloth material such as the non-woven fabric. 
     In addition, the second coupling member  42  in which the intake valve part  40  is installed and the exhaust valve housing member  52  in which the exhaust valve part  50  is installed may be coupled to the edge portions of the second intake hole  41  and the exhaust hole  51 , respectively, to be a detachable structure using an uneveness method, a press-fit method, or the like as necessary. 
     As described above, when the air filter part  30  and the mask body  10  are completely formed through steps Si to S 3  and steps S 4  and S 5 , the first coupling member  32   b  and the second coupling member  42  are coupled by coupling of the coupling groove  32   c  and the coupling protrusion  42   a  so that the air filter part  30  is detachably coupled to the front of the mask body  10 . 
     In addition, as an example of the present embodiment, the case in which the mask body  10  is formed after the air filter part  30  is formed through steps S 1  to S 3  has been described but the mask body  10  may also be formed first as necessary. 
     Second Embodiment 
     In the case of the present embodiment, an entire structure of a dustproof mask is the same as that of the first embodiment, but, since there is a difference only in a method of manufacturing an air filter part  30 , hereinafter, components that are the same as those of the first embodiment will be denoted by the same reference numerals, and redundant descriptions thereof will be omitted. 
       FIG. 8  is a set of views for describing a method of manufacturing an air filter part of  FIG. 1  according to a second embodiment of the present invention. 
     In the method of manufacturing the air filter part  30  according to the second embodiment of the present invention, after the filter members  31  and  32  having sheet shapes are prepared first, the intake hole  32   a  is formed at one side of the filter members  31  and  32  (S 10 ). 
     In this case, the filter members  31  and  32  may be divided into a first region A 1  in which the intake hole  32   a  is formed and a second region A 2  which is a remaining region by a virtual folding line FL in a longitudinal direction as will be described below, and lengths of the first region A 1  and the second region A 2  may be different. 
     To this end, in the present embodiment, as illustrated in  FIG. 8 , a length L 2  of a second region A 2  is provided to be greater than a length L 1  of a first region A 1 , and as an example, the length L 2  of the second region A 2  is provided to be 1.1 to 1.5 times greater than the length L 1  of the first region A 1 . 
     In this case, a second filter member  32  described in the first embodiment is formed in the first region A 1  and a first filter member  31  is formed in the second region A 2 . 
     In addition, an intake hole  32   a  is formed at a position corresponding to an intake valve part  40  of a mask body  10 , and as an example of the present embodiment, the intake hole  32   a  is formed in a central portion of the first region A 1 . 
     In addition, step S 10  may further include a step of curing a part of an outer side of the intake hole  32   a  in the first region A 1  to form a first support part  32   e,  and the formation of the first support part  32   e  may be performed through a method of heating and curing a specific portion of the first region using, for example, a thermoforming or ultrasonic forming method, or a method of bonding a film or the like to the specific portion. 
     In addition, as described above, in the case of the method of bonding the film or the like to the specific portion, the film may be more preferably formed of a material the same as that of the filter members  31  and  32  or a material having a hardness greater than that of the filter members  31  and  32 . 
     As an example of the case of the present invention, the first support part  32   e  is formed to have a ring shape provided at an outer side of the intake hole  32   a,  a bar shape provided above, under, left, and right portions of the intake hole  32   a,  or a mixed shape thereof. 
     When step S 10  is completed, a step of coupling an edge of the intake hole  32   a  and a ring-shaped member is performed (S 20 ), the ring-shaped member may be a first coupling member  32   b  protruding outward from the edge of the intake hole  32   a  and having a tubular shape as described above. 
     When step S 20  is completed, a step of folding the first region A 1  and the second region A 2  along a virtual folding line FL is performed (S 30 ), and in this case, the length L 2  of the second region A 2  is longer than the length L 1  of the first region A 1  as described above. 
     In addition, the second filter member  32  and the first filter member  31  previously described in the first embodiment are formed in the first region A 1  and the second region A 2 , respectively, which are folded to face each other, in step S 30 . 
     In addition, when step S 30  is completed, edge portions where outer end portions of the first region A 1  and the second region A 2  are in contact with each other are bonded to form a first bonded portion  33   a  (S 40  and S 50 ), and the bonding process may be performed by a thermal bonding method, a ultrasonic bonding method, a method using an adhesive, or the like. 
     As described above, when the first bonded portion  33   a  is formed through bonding of the edge portions of the first region (that is, second filter member) and the second region (that is, first filter member), since the length of the second region A 2  is greater than the length of the first region A 1 , the central portion of the second region A 2  is formed to have a dome shape which is substantially convex outward. 
     Accordingly, the first region A 1  and the second region A 2  may form a pouch-shaped air filter part  30  in which a space is formed. 
     In this case, the edge portion bonding step may be performed by a single process but may also be performed using a method in which, after the edge portions of the first region A 1  and the second region A 2  in longitudinal directions (in upward and downward directions of an intake hole in step S 40  of  FIG. 8 ) are bonded first, the remaining edge portions are bonded to stably form an inner space of the air filter part  30 . 
     As an example of the present embodiment, the edge portion bonding process is divided into and performed by a first bonding step S 40  and a second bonding step S 50 . 
     In this case, in the first bonding step S 40 , a first edge portion  33   c  where the outer end portion of the first region A 1  is in contact with the outer end portion of the second region A 2  in a portion where the first region A 1  and the second region A 2  are folded and a second edge portion  33   d  which faces the first edge portion  33   c  and where the other outer end portion of the first region A 1  is in contact with the other outer end portion of the second region A 2  are bonded first. 
     In addition, in the second bonding step S 50 , the remaining edge portions, which are not bonded in the first bonding step, are bonded to form the first bonded portion  33   a  together with the first and second edge portions  33   c  and  33   d  which are bonded first, and in this case, step S 50  may further include a step of forming left and right regions of the intake hole  32   a  to have a shape of the air filter part  30 , which is designed in advance. 
     As described above, when steps S 40  and S 50 , which are the edge portion bonding processes, are completed, a process of coupling both sides of the air filter part  30  and wearing straps  60  is performed (S 60 ), and in step S 60 , second bonded portions  33   b  to which the wearing straps  60  are coupled may be formed at both sides of the air filter part  30  as described in the previous first embodiment. 
     Third Embodiment 
       FIGS. 9 and 10  are a set of views for describing a method of manufacturing an air filter part of  FIG. 1  according to a third embodiment of the present invention and a set of views for describing a use state, respectively. 
     Even in the case of the present embodiment, an entire structure of a dustproof mask is the same as that of the first embodiment, but, since there is a difference only in a method of manufacturing an air filter part  30 , hereinafter, components that are the same as those of the first embodiment will be denoted by the same reference numerals, and redundant descriptions will be omitted. 
     In the case of the air filter part  30  manufactured by the above-described method according to the first and second embodiments, since an entire shape thereof is a shape widely extending in upward, downward, leftward, and rightward directions to cover the mask body  10  and a shape in which the first filter member  31  (that is, second region) has the dome shape protruding outward due to the pouch shape of the inner space  35 , there is a disadvantage in that a large space for storing or packaging products is required. 
     Accordingly, a method of manufacturing the air filter part  30  according to the third embodiment or a fourth embodiment of the present invention further includes a process of compactly folding the air filter part  30  formed to have a pouch-shaped inner space  35  therein for easy storing or packaging. 
     First, since steps S 110  to S 130  of the method of manufacturing the air filter part according to the third embodiment of the present invention are performed using the same processes in steps S 10  to S 30  according to the above-described second embodiment, the repeated description thereof will be omitted here. 
     When step S 130  is completed, after a first edge portion  33   c  and a second edge portion  33   d  of a first region A 1  and a second region A 2  are bonded first (S 140 ), the remaining edge portions, which are not bonded in step S 140 , of left and right sides of an intake hole  32   a  are bonded to form an overall first bonded portion  33   a  (S 150 ) as described in steps S 40  and S 50  of the second embodiment. 
     When steps S 140  and S 150  are completed, steps of folding upper end portions and lower end portions of the first and second filter members  31  and  32 , of which edge portions are bonded, in directions in which an intake hole  32   a  formed in the first region (that is, second filter member) is covered thereby are performed (S 160 , S 170 , and S 180 ). 
     In this case, the upper end portions and the lower end portions of the first and second filter members  31  and  32  refer to an upper portion and a lower portion of the intake hole  32   a  in the drawings, and the upper end portions and the lower end portions are folded in arrow directions along folding lines illustrated as virtual lines in the drawings. 
     In addition, as an example of the present embodiment, the case in which, after the lower end portions of the first and second filter members  31  and  32  are folded first, the upper end portions thereof are folded thereon has been described, however, after the upper end portions are folded first, the lower end portions may be folded as necessary. 
     In addition, third bonded portions  31   a  and  31   b  may be partially formed on end portions of both sides of portions where the upper end portions and the lower end portions of the first and second filter members  31  and  32  are folded to stably maintain the state in which the upper end portions and the lower end portions are folded, and a method of forming the third bonded portions  31   a  and  31   b  is the same as the above-described method of forming the first and second bonded portions  33   a  and  33   b.    
     In addition, when step S 180  is completed, a process of coupling both ends of the air filter part  30  and wearing straps  60  is performed (S 190 ), and in step S 190 , second bonded portions  33   b  to which the wearing straps  60  are coupled may be further formed at both sides of the air filter part  30  as described above. 
     In the case of the air filter part  30  manufactured according to the third embodiment of the present invention, since a user can fold the upper end portions and the lower end portions before coupling the air filter part  30  to a mask body  10  or after separating the air filter part  30  from the mask body  10  as illustrated in  FIG. 10A , a vertical length of the intake hole  32   a  is significantly decreased, and a protruding extent of a first filter member  31  is also decreased, and thus there is an advantage in that storing or packaging is easy. 
     In addition, in the case in which the air filter part  30  is coupled to the mask body  10 , as illustrated in  FIGS. 10B and 10C , the folded portions are sequentially unfolded to be used, and in this case, the first filter member  31  protrudes forward and outward (that is, a left direction in the drawing) while the folded portions are unfolded, and the second filter member  32  is pulled in a direction toward a mask body  10  (that is, rightward direction in the drawing) 
     Accordingly, since the pouch-shaped inner space  35  formed between the first and second filter members  31  and  32  extends normally, the air filter part  30  performs a function of the air filter part  30  described in the first or second embodiment. 
     Fourth Embodiment 
       FIGS. 11 and 12  are a set of views for describing a method of manufacturing an air filter part of  FIG. 1  according to a fourth embodiment of the present invention, and a set of views for describing a use state, respectively. 
     Even in the case of the present embodiment, an entire structure of a dustproof mask is the same as that of the first embodiment, but, since there is a difference only in a method of manufacturing an air filter part  30 , hereinafter, components that are the same as those of the first embodiment will be denoted by the same reference numerals, and redundant descriptions thereof will be omitted. 
     The method of manufacturing the air filter part  30  according to the fourth embodiment of the present invention is substantially the same as that of the third embodiment, but there is a slight difference between steps of folding upper end portions and lower end portions of first and second filter members  31  and  32  (S 270  and S 280 ) 
     Accordingly, since steps S 210  to S 260  are the same as steps S 110  to S 160  of the third embodiment, respectively, the repeated description thereof will be omitted here. 
     Meanwhile, when step S 260  is completed, in step S 270 , after the lower end portions of the first and second filter members  31  and  32  are folded, a portion, which is folded, of a second region (that is, first filter member) is cured to form a second support part  31   c,  and in step S 280 , after the upper end portions of the first and second filter members  31  and  32  are folded, a portion, which is folded, of the second region (that is, first filter member) is cured to form a second support part  31   d.    
     In this case, in a case in which the upper end portions and the lower end portions of the first and second filter members  31  and  32  are folded, as described above, since lengths of a first region A 1  and a second region A 2  are different, an end portion having a length, which is relatively greater than a length of an end portion of the first region, of the second region is positioned at a position further outward than the end portion of the first region in the folded portion, and thus only the end portions of the second region A 2  may be cured to form the second support parts  31   c  and  31   d.    
     As described above, in the case in which the folded portion of the second region A 2  is cured, and the folded upper end portions and lower end portions of the first and second filter members  31  and  32  are unfolded as illustrated in  FIG. 12 , since the second support parts  31   c  and  31   d  perform functions of lateral ribs, the first filter member  31  is prevented from approaching in a direction (that is, rightward direction) toward the mask body  10 , and thus there is an advantage in that a pouch-shaped inner space  35  formed between the first filter member  31  and the second filter member  32  can be more stably maintained. 
     Fifth Embodiment 
       FIG. 13  is a perspective view illustrating a structure of a dustproof mask according to a fifth embodiment of the present invention, and  FIG. 14  is a view illustrating a state in which the dustproof mask illustrated in  FIG. 13  is worn. 
     In addition,  FIG. 15  is a cross-sectional view taken along line D-D of  FIG. 14 , and  FIG. 16  is a set of views for describing a method of manufacturing the dustproof mask according to the fifth embodiment of the present invention. 
     In the above-described first to fourth embodiments, the case in which the dustproof mask includes the pouch-shaped air filter part  30  and the mask body  10  has been described, but the air filter part manufactured according the embodiments may also be formed to perform a function of a mask body as is. 
     The fifth embodiment of the present invention relates to this, and the dustproof mask according to the present embodiment is formed to include a mask body  330  having a sealed pouch shape, and wearing straps  360  coupled to end portions of both sides of the mask body  330 . 
     The method of manufacturing the dustproof mask formed as described above according to the present invention will be described below. First, after preparing filter members  331  and  332  having sheet shapes, an intake hole  332   a  is formed at one sides of the filter members  331  and  332  (S 310 ). 
     In this case, the filter members  331  and  332  may be divided as a first region A 1  in which the intake hole  332   a  is formed and a second region A 2 , which is the remaining portion, by a virtual folding line FL like the above-described second embodiment, and lengths of the first region A 1  and the second region A 2  may be different. 
     In addition, like the second embodiment, the second filter member  332  described in the first embodiment is formed in the first region A 1  and the first filter member  331  is formed in the second region A 2 . 
     In addition, like the second embodiment, step S 310  may further include a step of curing a part of an outer side of the intake hole  332   a  in the first region A 1  to form a first support part  332   e.    
     When step S 310  is completed, a step of coupling an edge of the intake hole  332   a  and a ring-shaped member is performed (S 320 ), and the ring-shaped member may be a first coupling member  332   b  having a tubular shape and protruding outward from the edge of the intake hole  332   a  like the first and second embodiments. 
     When step S 320  is completed, a step of folding the first region A 1  and the second region A 2  along the virtual folding line FL is performed so that the first region A 1  faces the second region A 2  (S 330 ), and in this case, a length L 2  of the second region A 2  is greater than a length L 1  of the first region A 1  as described above. 
     In addition, the first region A 1  and the second region A 2  folded to face each other in step S 330  form the second filter member  332  and the first filter member  331 , respectively, as previously described in the first embodiment. 
     In addition, when step S 330  is completed, a step of bonding a first edge portion  333   c  and a second edge portion  333   d  of the first region A 1  and the second region A 2  of a filter member folded to have lengths different from each other through a process which is the same as step S 40  of the second embodiment (omitted repeated description) is performed (S 340 ). 
     Next, the remaining edge portions, which are not bonded in step S 340 , of left and right sides of the intake hole  332   a  are bonded to form an entirety of a first bonded portion  333   a  so that a sealed pouch-shaped mask body  330  is formed (S 350 ). 
     In addition, in step S 350 , the first region (that is, second filter member) is bonded to a part of the second region (that is, first filter member) at one lower side of the intake hole  332   a  to additionally form an exhaust hole region  333   e,  and in this case, the first bonded portion  333   a  and the exhaust hole region  333   e  may be formed through sequential or simultaneous processes. 
     In addition, step S 350  may further include a step of forming left and right regions of the intake hole  332   a  to have a shape, which is previously designed, of the mask body  330  as described above in the first embodiment. 
     Thus, when steps S 340  and S 350  are completed, a process of forming an exhaust hole  351  in the exhaust hole region  333   e  is performed (S 360 ), and a step of coupling an edge of the exhaust hole  351  and a third coupling member  353  which is a ring-shaped member is performed (S 370 ). 
     In this case, the third coupling member  353  having the ring shape is a tubular coupling member and is formed to be coupled to an exhaust valve part  350 , as will be described below, similar to the first coupling member  332   b  having the tubular shape and protruding outward from the edge the intake hole  332   a  as described above. 
     In addition, a shape or a manufacturing method of the mask body  330  having the pouch shape formed by the first region A 1  and the second region A 2  through above-described steps is similar to that of the air filter part  30  according to the above-described embodiments but the mask body  330  performs a function of a mask body as is. 
     Accordingly, the second filter member  332  (that is, first region), in which the intake hole  332   a  is formed, faces a user&#39;s face, and the first filter member  331  (that is, second region) facing the second filter member  332  faces the outside. 
     In addition, when step S 370  is completed, a process of coupling both sides of the mask body  330  and wearing straps  360  is performed (S 380 ), and in step S 380 , second bonded portions  333   b  to be coupled to the wearing straps  360  may be further formed at both sides of the mask body  330  as described above. 
     In addition, although not illustrated in the drawings, in the method of manufacturing the dustproof mask according to the present embodiment, a step of coupling the intake hole  332   a  and the exhaust hole  351  to an intake valve part  340  and an exhaust valve part  350 , respectively, described in the first embodiment may be further performed, wherein structures of the intake valve part  340  and the exhaust valve part  350  are the same as those described in the first embodiment. 
     In this case, coupling of the first coupling member  332   b  and the intake valve part  340  is performed by coupling of a coupling groove (not shown) and a coupling protrusion (not shown) formed in the first coupling member  332   b  and a second coupling member (not shown) formed on the intake valve part  340 , respectively, like the above-described first embodiment. 
     In addition, coupling of the third coupling member  353  and the exhaust valve part  350  is also performed by coupling of a coupling groove (not shown) and a coupling protrusion (not shown) formed on the third coupling member  353  and an exhaust valve housing member (not shown), respectively, like the above-described coupling of the intake valve part  340 . 
     In this case, a process of coupling the intake valve part  340  and the exhaust valve part  350  may be performed after step S 370  or S 380 , and in a case in which the steps are performed, the dustproof mask according to the present invention is manufactured and provided to a user in a state in which the mask body  330  is coupled to the intake valve part  340  and the exhaust valve part  350 . 
     In addition, in the dustproof mask according to the present invention, since the mask body  330  coupled to the wearing straps  360 , and the intake valve part  340  and the exhaust valve part  350  are separately provided as necessary, the user may directly couple the mask body  330  to the intake valve part  340  and the exhaust valve part  350  to use the dustproof mask when using the dustproof mask. 
     In addition, the method of manufacturing the dustproof mask according to the present invention may also further include a process of sequentially folding an upper end portion and a lower end portion of the inhale hole  332   a  like the third and fourth embodiments as necessary, but, since the process is the same as those of the above-described embodiments, the repeated description thereof will be omitted here.