WO2022168932A1 - 医療用フィルタユニットとその製造方法およびリユースマスク用のフィルタユニットとそれを用いたリユースマスク - Google Patents

医療用フィルタユニットとその製造方法およびリユースマスク用のフィルタユニットとそれを用いたリユースマスク Download PDF

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Publication number
WO2022168932A1
WO2022168932A1 PCT/JP2022/004331 JP2022004331W WO2022168932A1 WO 2022168932 A1 WO2022168932 A1 WO 2022168932A1 JP 2022004331 W JP2022004331 W JP 2022004331W WO 2022168932 A1 WO2022168932 A1 WO 2022168932A1
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WO
WIPO (PCT)
Prior art keywords
filter
frame
filter sheet
valleys
ridges
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/004331
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English (en)
French (fr)
Japanese (ja)
Inventor
裕之 中神
賢 鈴木
信也 安積
隆司 江島
陽一郎 三原
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Nipro Corp
Original Assignee
Nipro Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nipro Corp filed Critical Nipro Corp
Priority to JP2022579614A priority Critical patent/JPWO2022168932A1/ja
Publication of WO2022168932A1 publication Critical patent/WO2022168932A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/06—Respiratory or anaesthetic masks
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02—Masks
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material

Definitions

  • the present invention relates to a medical filter unit used for infection prevention and the like, a reusable filter unit for reusable masks, and the like.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2020-506734
  • a pleated face piece that collects particles is attached to the face piece worn on the user's face.
  • the filter unit of Patent Document 1 has a structure in which a flexible frame as a frame is integrally fixed around a filter member.
  • an object of the present invention is to provide a medical filter unit with a novel structure that can be used for a medical mask or the like, and has excellent collection performance against viruses and the like.
  • Another object of the present invention is to provide a method for manufacturing the medical filter unit described above.
  • Another object of the present invention is to provide a filter unit for a reusable mask and a reusable mask using the same, in which a high-performance filter member can be used multiple times.
  • a first aspect is a medical filter unit, wherein a filter member having a filter sheet is housed in a cylindrical frame portion provided on a resin support attached to a main body member, and the filter The sheet is folded back into a pleated shape with a plurality of ridges and valleys, and the first edge portions of the filter sheet on both sides in the continuous direction of the ridges and valleys and the zigzag continuous zigzag on both sides in the width direction of the ridges and valleys.
  • the second edge portion of the filter sheet is embedded and fixed to the frame over its entire length, and the periphery of the filter sheet is fixed to the frame while being embedded over its entire circumference. .
  • the filter sheet that constitutes the filter member has a pleated shape with a plurality of ridges and valleys. It is possible to improve the quality. Therefore, even if a fine-mesh filter sheet that can collect microparticles such as viruses is adopted, when applied to a medical mask, for example, the user does not feel suffocation and can be worn for a long time. can be. Therefore, it is possible to continuously enjoy the effects such as prevention of infection by wearing the medical mask for a long period of time.
  • the periphery of the filter sheet is fixed over the entire periphery to the frame that houses the filter member, it is possible to prevent the formation of a gap between the filter member and the frame, thereby preventing viruses, etc. caused by the gap from forming. intrusion can be prevented. Since the periphery of the folded and pleated filter sheet is fixed to the frame over the entire periphery, a gap is formed between the filter member and the frame even when the folded height of the filter sheet is large. It is possible to realize high collection efficiency. Therefore, the degree of freedom in setting the height of the cuffs is large, and for example, it is possible to increase the height of the cuffs to improve air permeability.
  • the folded filter sheet having a plurality of ridges and valleys can be firmly and reliably fixed to the frame. Therefore, for example, when an external pressure is applied to the filter sheet or the frame and deformation occurs, it is possible to prevent the formation of a gap due to separation between the filter sheet and the frame. In addition, for example, formation of unintended gaps due to poor adhesion of the filter sheet to the frame during molding of the frame (for example, poor adhesion between both ends in the width direction of the ridges and valleys of the filter sheet and the frame) is prevented. .
  • a second aspect is the medical filter unit according to the first aspect, wherein the second edge portion of the filter sheet is embedded in the frame while being inclined in the circumferential direction of the frame. It has an affixed end to which it is affixed.
  • the fixed end fixed to the frame in an embedded state is inclined in the circumferential direction of the frame, so that the second end having the fixed end The attachment area of the edge to the frame is increased. Therefore, the filter sheet is stably attached to the frame at the second edge.
  • a third aspect is the medical filter unit according to the first or second aspect, wherein the first edge portion of the filter sheet is folded back and fixed to the frame portion in an embedded state. It has a piece.
  • the first end edge of the filter sheet is provided with the fixing piece folded back, so that the fixing piece can be fixed to the frame in an embedded state. , the first edge of the filter sheet can be more stably fixed to the frame. Since the non-buried portion of the fixing piece seems to be compressed compared to the buried portion, it is possible to increase the effective area of the filter sheet and increase the fixing strength.
  • a fourth aspect is a medical filter unit, wherein a filter member having a filter sheet is accommodated in a tubular frame portion provided in a resin support attached to a main body member, and the filter The sheet is folded back into a pleated shape with a plurality of ridges and troughs, and a bead portion extending in the continuous direction of the ridges and valleys of the filter sheet to hold the ridges and valleys is provided, and the frame portion is directed toward the bead portion. and a fixing protrusion that protrudes and is fixed to the bead.
  • the shape stability of the folded filter sheet is enhanced by the bead portions. become easier.
  • the fixing protrusion of the frame to the portion where the bead portion of the filter member is formed, which has particularly excellent shape stability, the fixing strength between the filter member and the frame can be improved, and external pressure can be applied. Deformation of the filter member with respect to the frame can be suppressed.
  • the bead portion is made of a thermoplastic resin and is melted by the heat generated when the frame portion is molded, the fixed protrusion and the melted bead portion are integrally fixed to each other, thereby increasing the fixing strength. is further improved.
  • a fifth aspect is a method for manufacturing a medical filter unit, in which a filter member having a filter sheet is housed in a cylindrical frame provided on a resin support attached to a main body member, a first step of setting the filter member provided with a bead portion for holding the ridges and valleys to the filter sheet folded back into a pleated shape with a plurality of ridges and valleys in a mold for molding the support; First edge portions of the filter sheet positioned on both sides in the continuous direction of the ridges and valleys, and second edge portions of the filter sheet positioned on both sides in the width direction of the ridges and valleys and extending continuously in a zigzag manner, By filling the cavity of the molding die with a resin material while positioned in the cavity of the molding die and molding the support, the filter sheet is fixed over the entire circumference. and a second step of forming a frame portion of the support.
  • the filter sheet constituting the filter member has a pleated shape with a plurality of ridges and valleys, thereby ensuring a large effective area of the filter sheet. , ventilation is improved. Therefore, even if a fine-mesh filter sheet that can collect microparticles such as viruses is adopted, when applied to a medical mask, for example, the user does not feel suffocation and can be worn for a long time. can be. Therefore, it is possible to continuously enjoy the effects such as prevention of infection by wearing the medical mask for a long period of time.
  • the periphery of the filter sheet is fixed over the entire periphery to the frame that houses the filter member, it is possible to prevent the formation of a gap between the filter member and the frame, thereby preventing viruses, etc. caused by the gap from forming. intrusion can be prevented. Since the periphery of the folded and pleated filter sheet is fixed to the frame over the entire periphery, a gap is formed between the filter member and the frame even when the folded height of the filter sheet is large. It is possible to realize high collection efficiency. Therefore, the degree of freedom in setting the height of the cuffs is large, and for example, it is possible to increase the height of the cuffs to improve air permeability.
  • a sixth aspect is a medical filter unit, wherein a filter member provided with a filter sheet is accommodated in a cylindrical frame provided on a resin support attached to a main body member, and the filter The sheet is folded back into a pleated shape with a plurality of ridges and valleys, and the support is provided with a plate-shaped portion extending from the axial end portion of the frame portion to the outer periphery, and a resin material is injected into the plate-shaped portion.
  • a groove-shaped portion located on the inner peripheral side of the injection port mark and extending in the circumferential direction of the frame portion is opened and formed. It is what is done.
  • the resin material injected from the injection port into the molding cavity of the support forms the groove-shaped portion by flowing toward the inner peripheral side. It is resisted and restricted by the convex portion of the mold. As a result, it is possible to prevent the filling pressure and substantially vertical flow of the resin material filled in the molding cavity from directly acting on the filter member. , unintended intrusion of the resin material into the ridges and valleys of the filter member.
  • a seventh aspect is the medical filter unit according to the sixth aspect, wherein the groove portion extends along the outer peripheral side of the second edge portion of the filter sheet along the second edge portion. It is extended.
  • the filling pressure of the resin material directly acts on the second edge portion, which tends to cause problems for the resin material to enter due to the zigzag extension. can be prevented.
  • An eighth aspect is a medical filter unit, wherein a filter member having a filter sheet is accommodated in a cylindrical frame portion provided in a resin support attached to a main body member, and the filter The sheet is folded back into a pleated shape with a plurality of ridges and valleys, and the support is an elastic body. A seal portion is formed integrally with the frame portion.
  • the seal structure configured by pressing the seal portion against the main body member creates a gap between the filter unit and the main body member. can prevent gaps from forming in the Moreover, since the frame and the seal are integrally formed, it is possible to prevent the formation of a gap between the frame and the seal. Therefore, it is possible to prevent viruses and the like from short-circuiting between the filter unit and the main body member or between the frame and the sealing portion and entering through the filter sheet.
  • a ninth aspect is the medical filter unit described in the eighth aspect, wherein the sealing portion is sandwiched between the main body members so that the seal portion is sandwiched between the support body and the support body in a direction in which the sealing portion is sandwiched between the main body members.
  • a first seal structure that seals between the body members and a second seal structure that seals between the support and the body members in a direction crossing a direction in which the seal portion is sandwiched by the body members. It is.
  • the seal portion when the filter unit is attached to the main body member, the seal portion is sandwiched between the main body members, thereby sealing the space between the support body of the filter unit and the main body member. be done.
  • the intake air reliably passes through the filter member without causing a short circuit between the support and the main body member, and viruses and the like can be collected with high efficiency.
  • first seal structure and the second seal structure are configured by sandwiching the seal portion between the main body members in one direction, and there is no need to provide separate seal members. planned.
  • a tenth aspect is a medical filter unit, wherein a filter member having a filter sheet is housed in a cylindrical frame portion provided in a resin support attached to a main body member, and the filter The sheet is folded back into a pleated shape with a plurality of ridges and valleys, and the first edge portions of the filter sheet on both sides in the continuous direction of the ridges and valleys and the zigzag continuous zigzag on both sides in the width direction of the ridges and valleys.
  • the second end edge of the filter sheet is fixed to the frame over its entire length, and the periphery of the filter sheet is fixed to the frame over its entire periphery, and both axial ends of the frame are It protrudes outward in the axial direction from the filter member.
  • the size of the frame is larger than that of the filter member in the longitudinal direction of the cylindrical shape, so that the size of the frame to which the filter member is fixed has a margin. It is provided to stabilize the fixation of the filter member to the frame. In addition, since both ends of the frame portion in the axial direction protrude from the filter member, when the user grips the frame portion, it is difficult for the user to touch the filter member, and the filter member is protected. It is possible to prevent the filter member from collapsing due to contact or the like, and to prevent defects such as a change in the effective area due to deformation of the filter sheet.
  • An eleventh aspect is a medical filter unit, wherein a filter member provided with a filter sheet is housed in a cylindrical frame provided on a resin support attached to a main body member, and the filter The sheet is folded back into a pleated shape with a plurality of ridges and valleys, and the frame portion is an elastic body, and rib-shaped portions protruding from the outer peripheral surface of the frame portion and extending in the axial direction of the frame portion are formed on the frame portion. It is formed integrally with
  • the shape stability and dimensional accuracy of the frame housing the filter member are improved by the reinforcing action of the rib-shaped portion.
  • the thickness of the main body portion of the frame can be kept small, and at the same time, the rigidity and shape stability of the frame in the axial direction can be improved by the rib-shaped portion.
  • the frame portion is less likely to deform, even when the folded height of the filter sheet is large and the length of the filter member in the axial direction is long, the folded ends of the filter sheet in the axial direction of the filter member face each other. It is difficult to cause deformation such as physical displacement.
  • a twelfth aspect is a medical filter unit, wherein a filter member having a pleated filter sheet with a plurality of ridges and valleys connected is provided on a resin support attached to a main body member.
  • the support is provided with a plate-shaped portion extending from the frame to the outer periphery, and the plate-shaped portion has the outer periphery of each side of the frame.
  • Injection port traces of the resin material are located respectively.
  • the resin material for molding the frame is injected from the outer peripheral side of each side of the polygonal tubular frame, so that when molding the frame,
  • the injection pressure (molding pressure) of the resin material injected from a plurality of points can be reduced, and the force acting on the filter member is distributed to the portions of the filter member fixed to the respective sides of the frame. Therefore, the deformation of the filter member due to the molding pressure of the frame portion is suppressed, and the reduction of the effective area due to the deformation of the filter member is prevented.
  • a thirteenth aspect is a filter unit for a reusable mask, in which a filter member is arranged inside surrounded by a fluid-impermeable tubular frame, and a filter sheet constituting the filter member is folded back.
  • the height of the frame portion is greater than the height of the filter member, the height dimension of the frame portion is 20 mm or more, and the The inner dimension of the frame is 2.5 times or less than the height dimension.
  • the filter unit for a reusable mask constructed according to this aspect since the frame housing the filter member is formed in a relatively elongated cylindrical shape, the gas flow between the inside and the outside of the frame is reduced.
  • the sprayed disinfectant does not easily escape to the outside. Therefore, sprayed particles (including vaporized particles) of the disinfectant remaining in the frame spread over a wide range in the frame containing the filter member, easily diffuse in the inner space of the frame, and adhere to the entire filter member. Then, the entire filter member is disinfected, and the proliferation of bacteria and viruses can be effectively prevented.
  • the microparticles (including vaporized substances) of the sprayed disinfectant float within the frame and adhere to a wide area on the surface of the filter member, the disinfectant cannot be sprayed directly onto the valleys of the pleats.
  • the antiseptic solution also adheres to the parts, etc., and an effective disinfection action can be obtained over a wide range.
  • gaps between crests and valleys of pleats tend to have a structure that expands substantially outward, making it easier for the disinfectant sprayed from the outside to reach deep into the gaps.
  • a fourteenth aspect is the reusable mask filter unit described in the thirteenth aspect, wherein a bead portion is provided that extends in the continuous direction of the ridges and valleys of the filter sheet and holds the ridges and valleys.
  • the pleated shape due to the ridges and troughs of the filter member can be easily maintained, and for example, the filter sheet can be prevented from overlapping in the abutting state.
  • the liquid can easily flow into the gaps between the ridges and valleys of the filter sheet, and can adhere to the bottom side of the valleys.
  • a fifteenth aspect is the reusable mask filter unit according to the thirteenth or fourteenth aspect, wherein the surface of the filter sheet is made of nonwoven fabric.
  • the sprayed particles of the disinfectant adhere to the fine fibers on the surface of the nonwoven fabric, so that the sprayed particles of the disinfectant are easily captured by the entire filter sheet. . Therefore, sprayed particles of the disinfectant floating in the frame adhere to a wide area of the filter sheet, and the disinfection effect can be obtained over a wide area.
  • a sixteenth aspect is the filter unit for a reusable mask according to any one of the thirteenth to fifteenth aspects, wherein both ends of the frame in the axial direction protrude further outward in the axial direction than the filter member. There is.
  • the sprayed particles of the disinfectant sprayed into the frame easily remain in the frame, and the filter sheet can be more effectively disinfected by spraying the disinfectant. can be done.
  • a seventeenth aspect is a reusable mask comprising the filter unit for reusable masks described in any one of the thirteenth to sixteenth aspects.
  • the filter unit which has excellent air permeability and collection performance of target particles such as bacteria and viruses, can be used repeatedly for multiple times.
  • the present invention for example, it is possible to provide a medical filter unit that can be used for medical masks and the like and has excellent collection performance against viruses and the like. Further, the invention according to some of the aspects described above can provide a filter unit for a reusable mask or a reusable mask using the filter unit, in which a high-performance filter member can be used multiple times.
  • FIG. 1 is a front view showing a medical filter unit as a first embodiment of the present invention
  • FIG. Rear view of the medical filter unit shown in FIG. The right side view of the medical filter unit shown in FIG. IV-IV cross-sectional view of FIG. VV sectional view of FIG.
  • FIG. 2 is a front view of a support that constitutes the medical filter unit shown in FIG. 1;
  • a plan view of the support shown in FIG. The right side view of the support shown in FIG. Rear view of the support shown in FIG. Photograph showing an enlarged part of the medical filter unit shown in FIG.
  • FIG. 2 is a view for explaining attachment of the medical filter unit shown in FIG. 1 to the filter support member, and shows a state before the seal portion is sandwiched between the filter support members;
  • FIG. 2 is a view for explaining attachment of the medical filter unit shown in FIG. 1 to the filter support member, and shows the seal portion after being sandwiched between the filter support members;
  • FIG. 2 is a perspective view showing a mask equipped with the medical filter unit shown in FIG. 1 in a wearing state; The perspective view which showed the mask main body which comprises the mask of FIG. 12 from another angle.
  • FIG. 12 is a cross-sectional view of the mask shown in FIG. 12 and corresponds to the XIV-XIV cross section of FIG. 13; XV-XV sectional view of FIG.
  • the filter unit 10 includes a filter member 12 and a support 14 made of resin.
  • the vertical direction refers to the vertical direction in FIG. 1
  • the lateral direction refers to the lateral direction in FIG. 1
  • the longitudinal direction refers to the lateral direction in FIG.
  • Each direction defined here is a convenient direction for facilitating understanding, and does not necessarily coincide with, for example, the vertical up-down direction or the horizontal direction when wearing a medical mask.
  • the filter member 12 has a pleated filter sheet 16 .
  • the filter sheet 16 is a porous filtration membrane made of nonwoven fabric or the like.
  • the filter sheet 16 is pleated by a folding machine and folded back many times to form a pleated shape with a plurality of ridges and valleys.
  • the peaks (folded portions) 20 of the ridges and valleys form angles or are curved with minute radii.
  • the inclined portion 21 extends.
  • the distance between the tops 20, 20 on the front side and between the tops 20, 20 on the rear side adjacent to each other in the continuous direction (vertical direction) of the ridges and valleys of the filter sheet 16 is substantially constant. Improvement of breathability is planned.
  • Both end edges of the filter sheet 16 in the continuous direction (vertical direction) of the plurality of ridges and valleys are first edge portions 22, 22 extending linearly in the left-right direction. Both end edges of the filter sheet 16 in the width direction (horizontal direction) of the ridges and valleys are folded back in a zigzag to form second edge portions 24, 24 that extend continuously.
  • the widthwise length of the pleated filter sheet 16 is longer than the widthwise inner dimension of the frame portion 30, which will be described later.
  • the filter sheet 16 is pleated to form 10 or more pleat peaks that are folded forward so as to protrude forward, and in this embodiment, 16 pleat peaks are formed.
  • the first edge portions 22, 22 of the filter sheet 16 have fixing pieces 26, 26.
  • the fixing piece 26 is formed by folding back the end of the filter sheet 16 and protrudes outward in the vertical direction.
  • the fixing pieces 26 are desirably inclined at an inclination angle ⁇ smaller than 45 degrees with respect to the vertical direction, so that when the frame portion 30 is formed of resin, the resin can easily wrap around both surfaces of the fixing pieces 26 . , the fixing piece 26 is securely fixed to the frame portion 30 .
  • the inclination angle ⁇ of the fixing piece 26 with respect to the vertical direction may be, for example, less than 30 degrees, less than 15 degrees, or about 10 degrees or about 5 degrees.
  • the pleated filter sheet 16 has a bead portion 28 that stabilizes the pleated shape.
  • the bead portion 28 is made of, for example, a thermoplastic adhesive. That is, the bead portion 28 is formed by solidifying an adhesive linearly applied to both the front and back surfaces of the filter sheet 16 so as to extend in the continuous direction (vertical direction) of the peaks and valleys of the pleats after pleating. It is provided linearly extending in the continuous direction of the ridges and valleys.
  • the bead portions 28 hold the folded shape of the filter sheet 16 by positioning the vertically adjacent sloped portions 21 , 21 with each other.
  • the bead portion 28 restricts the distance between the inclined portions 21 and 21 and solidifies between the inclined portions 21 and 21 by fixing the adhesive applied to the adjacent inclined portions 21 and 21 to each other.
  • the applied adhesive functions as a spacer to limit the access of the inclined portions 21, 21, thereby retaining the pleated shape.
  • the two bead portions 28 , 28 are provided at positions separated from each other in the width direction (horizontal direction) of the folded portion of the filter sheet 16 .
  • the two bead portions 28, 28 are positioned in the center of the filter sheet 16 in the left-right direction and in the middle outside both ends. It protrudes outward in the left-right direction from 28 .
  • the filter member 12 of the present embodiment is formed by providing the pleated filter sheet 16 with the bead portions 28 , 28 .
  • the distance between the second edge portion 24 of the filter sheet 16 and the bead portion 28 on the side closer to the second edge portion 24 is shorter than the distance between the two bead portions 28 , 28 .
  • the shape of the second edge portion 24 of the filter sheet 16 is stabilized, and defects such as sticking and peeling between the second edge portion 24 of the filter sheet 16 and the frame portion 30 are less likely to occur.
  • the support 14 has a cylindrical frame portion 30, as shown in FIGS.
  • the frame portion 30 of the present embodiment has a rectangular tubular shape extending in the front-rear direction with a substantially rectangular cross section.
  • a housing hole 32 for housing the filter member 12 is formed through the frame portion 30 in the longitudinal direction, which is the axial direction.
  • the frame portion 30 of the present embodiment is an elastic body made of soft synthetic resin.
  • a resin elastomer is suitable, and for example, an elastomer such as polyurethane or soft vinyl chloride may be employed.
  • the frame portion 30, which is an elastic body made of synthetic resin has fluid impermeability that does not allow permeation of liquid and gas.
  • a rib-shaped portion 34 is provided on the outer peripheral surface of the frame portion 30 .
  • the rib-shaped portion 34 protrudes from the frame portion 30 toward the outer periphery, extends in the axial direction with a substantially semicircular cross section, and has a rear end connected to a plate-shaped portion 40 described later (see FIG. 6). 4).
  • three rib-like portions 34 are provided on the four side wall portions of the frame portion 30 having a square cross section so as to be spaced apart from each other in the circumferential direction of the frame portion 30 .
  • the rib-shaped portion 34 of this embodiment is integrally formed with the frame portion 30 .
  • the size, position, number, and the like of the rib-shaped portions 34 are not limited.
  • the frame portion 30 having an outer peripheral surface having a shape substantially similar to the inner peripheral surface may be adopted without providing the rib-shaped portions 34. is also possible.
  • a fixing protrusion 36 is provided on the inner peripheral surface of the frame portion 30 .
  • the fixing protrusions 36 protrude from the upper and lower walls of the frame 30 toward the accommodation holes 32, and are provided at positions corresponding to the upper and lower ends of the bead 28 when the filter member 12 is accommodated, which will be described later. there is Therefore, in the upper wall portion and the lower wall portion of the frame portion 30, each two fixing projections 36, 36 are arranged at positions separated from each other in the left-right direction.
  • the fixing projection 36 has a width dimension in the horizontal direction larger than that of the bead portion 28, so that even if the position of the bead portion 28 varies in the horizontal direction, the end portion of the bead portion 28 is positioned on the fixing projection 36.
  • the fixing protrusion 36 is formed by the resin material entering into the filter member 12 side, and the specific shape may differ depending on the degree of penetration into the filter member 12 and the like. Therefore, as shown in FIG. 6, the specific shape of the frame portion 30, which is defined and formed by the molding die, can be specified as a shape that does not include the fixed projecting portion 36. As shown in FIG.
  • Both the upper and lower wall portions of the frame portion 30 are stepped surfaces 38 in which the rear surface of the inner peripheral portion is located forward of the rear surface of the outer peripheral portion.
  • the step surface 38 extends linearly in the horizontal direction with a substantially constant vertical width dimension smaller than the thickness dimension of the upper and lower wall portions of the frame portion 30 . Therefore, it is difficult for external force to be applied to the filter sheet 16 from the rear end side of the frame portion 30 .
  • a plate-like portion 40 is provided at the rear end of the frame portion 30 .
  • the plate-like portion 40 protrudes from the rear end portion of the frame portion 30 toward the outer periphery, and has a thin plate shape having a substantially circular outer shape.
  • the frame portion 30 and the plate-shaped portion 40 have different shapes, and the frame portion 30 has a rectangular inner and outer peripheral shape, so that the entire circumference of the filter sheet 16 can be easily fixed, and the plate-shaped portion 40 is attached to the body.
  • the filter support member 48 as a member has a circular outer shape so as not to be large.
  • the plate-like portion 40 has a front surface that slopes backward toward the outer periphery, and gradually becomes thinner toward the outer periphery away from the frame portion 30 .
  • the plate-like portion 40 is integrally formed with the frame portion 30 and is made of an elastic body like the frame portion 30 .
  • An annular seal portion 42 is provided on the outer peripheral side of the plate-shaped portion 40 .
  • the seal portion 42 is provided on the outer peripheral side of the plate-like portion 40 and is arranged to surround the entire outer periphery of the frame portion 30 .
  • the seal portion 42 is integrally formed with the plate-like portion 40 and is an elastic body.
  • the seal portion 42 has an annular seal lip 43 projecting forward.
  • the seal lip 43 has a surface with a substantially arcuate cross section, and the width dimension in the radial direction gradually decreases toward the projecting tip.
  • the protrusion height of the seal lip 43 is sufficiently smaller than the axial height dimension of the frame portion 30, and is smaller than the thickness dimension of the plate-like portion 40 in this embodiment.
  • the seal lip 43 has a flat cross-sectional shape in which the height dimension of the protrusion is smaller than the width dimension in the radial direction.
  • Grooves 44, 44 are formed on the rear surface of the plate-shaped portion 40, as shown in FIG.
  • the groove-shaped portion 44 extends linearly in the vertical direction along the left and right side wall portions of the frame portion 30 and opens to the rear surface.
  • the upper and lower end portions of the groove portion 44 are located inside the upper and lower wall portions of the frame portion 30 in the vertical direction.
  • the groove-shaped portion 44 of the present embodiment has a cross-sectional groove shape that widens gradually toward the rear.
  • the groove-shaped portion 44 of this embodiment is provided at the boundary between the left and right side wall portions of the frame portion 30 and the plate-shaped portion 40 , and a portion of the groove-shaped portion 44 is located at the rear end portion of the frame portion 30 . is doing.
  • the depth dimension of the groove-shaped portion 44 is preferably larger than half the thickness dimension of the inner peripheral edge of the plate-shaped portion 40 .
  • the rear surface of the plate-like portion 40 has an injection port mark 45.
  • the injection port trace 45 is a trace of an injection port (not shown) for injecting a resin material into a cavity of a molding die when molding the support 14 to be described later. It presents unevenness and differences in surface texture.
  • four inlet traces 45 are provided at approximately equal intervals in the circumferential direction of the plate-shaped portion 40, and two are provided at vertically separated positions with respect to the upper and lower walls of the frame portion 30, The other two are provided at positions left and right with respect to the left and right wall portions of the frame portion 30 .
  • the injection port mark 45 is formed on the outer peripheral side of each side (wall portion) of the square cylindrical frame portion 30 .
  • the left and right injection port traces 45, 45 are positioned inside the groove-shaped portions 44, 44 in the left-right direction, and the groove-shaped portions 44, 44 are closer to the receiving hole 32 than the left and right injection port traces 45, 45. , and extends in the vertical direction, which is the circumferential direction of the frame portion 30 . It should be noted that the injection port trace 45 can be erased to such an extent that it is difficult to visually confirm it with the naked eye, depending on the mold structure, molding conditions such as resin material, and post-molding treatment.
  • the frame portion 30 of the support 14 accommodates the filter member 12 as shown in FIGS.
  • the filter unit 10 having the structure according to the present invention in which the filter member 12 is accommodated in the frame portion 30 can be obtained based on the manufacturing method including the first step and the second step described below.
  • the filter sheet 16 in which a flat filter membrane is folded in a zigzag pattern and has a plurality of ridges and valleys in a pleated shape, the filter sheet 16 extends in the continuous direction of the ridges and valleys to hold the plurality of ridges and valleys of the filter sheet 16 2 .
  • a filter member 12 having a structure in which the bead portions 28, 28 are formed is prepared in advance. Then, the first step is completed by setting the filter member 12 prepared in advance in a mold for molding the support 14 (not shown).
  • the filter member 12 set in the mold for molding the support 14 is inserted into the frame portion 30 of the support 14 during molding of the support 14 in the second step. That is, the filter member 12 set in the mold for molding the support 14 in the first step has the first edge portions 22 and 22 and the second edge portions 24 and 24 inside the molding cavity of the frame portion 30. Protruding. Then, with the filter member 12 set in the mold for molding the support 14, the cavity of the mold for the support 14 is filled with a resin material to mold the support 14 with the resin. This completes the second step of molding the support 14 in which the filter member 12 is inserted.
  • the mold for molding the support 14 includes an outer mold for molding the outer peripheral surface of the frame portion 30 and a pair of comb-shaped molds for molding the inner peripheral surface of the frame portion 30 .
  • a molding cavity of the frame portion 30 is formed between the comb tooth-shaped mold.
  • the length in the width direction (horizontal direction) is longer than the length in the width direction of the inner peripheral portion of the frame portion 30, and the length in the continuous direction (vertical direction) of the ridges and valleys is within the frame portion 30. Since it is longer than the vertical length of the peripheral portion, both the first edge portions 22, 22 and the second edge portions 24, 24 can be protruded into the cavity of the frame portion 30.
  • the amount of protrusion of the filter member 12 into the cavity is substantially the same on both sides in the width direction and substantially the same on both sides in the continuous direction of the ridges and valleys.
  • the amount of protrusion of the filter member 12 into the cavity (the length of embedment in the frame portion 30) is preferably 1 mm or more (2 mm or more in total, considering that both ends are buried). less than the wall thickness. This makes it easier for the operator to position the filter member 12 at a position where both the left and right sides of the filter member 12 can be buried in the cavity when setting the filter member 12 in the mold.
  • the filter member 12 When molding the support 14 in the second step, the filter member 12 is placed in the molding cavity of the frame 30 along the entire circumference of the first edge portions 22, 22 and the second edge portions 24, 24 of the filter sheet 16. positioned. As a result, the filter member 12 is fixedly embedded in the frame portion 30 along the entire periphery of the filter sheet 16 . That is, in the filter sheet 16, the fixing pieces 26, 26 constituting the first edge portions 22, 22 are embedded and fixed in the rear end portion of the frame portion 30, as shown in FIG. The fixed end portions 46, 46 constituting the two edge portions 24, 24 are embedded and fixed to the left and right wall portions of the frame portion 30, as shown in FIG.
  • the frame portion 30 is gradually thickened from the front end to the rear end, the plate-like portion 40 protrudes from the rear end portion of the frame portion 30, and the fixing piece 26 is made thick. located at the rear end of the Further, the folding angle (90°- ⁇ ) of the fixing piece 26 is set larger than the folding angle (1/2 of the included angle of the apex 20) of the inclined portion 21 at the apex 20 of the ridges and valleys. Therefore, it is possible to prevent the embedding failure of the fixing piece 26 in the frame portion 30 from occurring without making the frame portion 30 particularly thick, and to reduce the weight load of the user wearing the mask. can.
  • the fixing piece 26 is located in a range of 1 ⁇ 5 from the rear end of the filter sheet 16 with respect to the length dimension of the filter sheet 16 in the front-rear direction, which is the height direction of the crests and valleys of the pleats.
  • the length dimension of the portion (tip portion) of the fixing piece 26 embedded in the frame portion 30 is greater than the length dimension between the adjacent top portions 20 and 20 and is greater than the thickness dimension of the upper and lower wall portions of the frame portion 30. made smaller. As a result, it is possible to prevent the fixing piece 26 from protruding from the frame 30 to the outer periphery while securing a large fixing strength of the fixing piece 26 to the frame 30 .
  • the fixed end portion 46 is inclined in the circumferential direction of the frame portion 30 , thereby increasing the fixed area to the frame portion 30 .
  • the inclination of the fixed end portion 46 may be formed by processing the filter sheet 16 in advance, or may be formed by filling pressure of the resin material when molding the frame portion 30, for example.
  • the widthwise length of the filter sheet 16 before forming the frame portion 30 is the length of the top portion 20 of the filter sheet 16 in the vertical direction ( It is preferably equal to or longer than the diameter of the top portion 20 having a semicircular cross section.
  • the filter member 12 is fixed with the first edge portions 22, 22 and the second edge portions 24, 24 respectively embedded in the frame portion 30 over the entire length thereof when the frame portion 30 is molded.
  • the filter sheet 16 is attached to the support 14 with the entire periphery fixed to the frame portion 30 .
  • the filter member 12 and the frame portion 30 are fixed to each other in a state in which the space between the filter member 12 and the frame portion 30 is sealed by the formation of the frame portion 30 .
  • a comb-like mold is inserted into the peaks and valleys of the pleats of the filter member 12 .
  • the resin material is prevented from entering the ridges and valleys of the pleats, and the filter member 12 is supported.
  • a reduction in the effective area of the filter member 12 due to being covered with the material forming the body 14 is avoided.
  • Comb-shaped dies inserted into the crests and troughs of the pleats of the filter member 12 are pressed against the front surface or the back surface of the filter sheet 16, and the filter sheet 16 is formed into a comb-teeth shape when the support 14 is molded. It is compressed in the thickness direction between the molds. In this way, the comb-shaped mold is pressed against the filter sheet 16 with an interference, which effectively prevents the material forming the support 14 from entering the peaks and valleys of the pleats of the filter member 12 . can be effectively prevented.
  • the inner peripheral portion of the pleated filter sheet 16 is desirably compressed by the comb-shaped mold such that the thickness is restored to approximately the same thickness as before compression by releasing the compression. As a result, the fine pores of the porous filter sheet 16 are not blocked by excessive compression, and the air permeability of the filter member 12 is ensured.
  • the comb-toothed mold is pressed more strongly than the inner peripheral portion of the pleated filter sheet 16 at the base end portion (the inner end portion in the vertical direction) of the fixing piece 26 , and is pushed inward from the frame portion 30 .
  • the proximal end portion of the fixing piece 26 exposed to the circumference is compressed more in the thickness direction.
  • impregnation of the resin material at the base end portion of the fixing piece 26 is suppressed, and reduction in the effective area of the filter member 12 is prevented.
  • the tip portion of the fixing piece 26 that is not compressed is buried in the resin material so as to be soaked in the resin material, preventing a gap between the filter sheet 16 and the frame portion 30 through which viruses may enter.
  • the base end portion of the fixing piece 26 is thinner than the tip portion of the fixing piece 26 embedded in the frame portion 30 due to plastic deformation during compression. Also, the base end portion of the fixing piece 26 is thinner than the inclined portion 21 of the filter sheet 16 located more centrally.
  • the portion (tip portion) of the fixing piece 26 embedded and fixed to the frame portion 30 is not compressed when the support 14 is molded, and is in a state in which the resin material is easily impregnated.
  • the fixing strength of the filter member 12 to the frame portion 30 is improved.
  • the tip surface of the comb-shaped mold is curved, and a gap is formed between the fixing pieces 26 and the comb-shaped mold that are in contact with each other.
  • the fixing piece 26 is fixed to the rear end portion of the frame portion 30 in an embedded state with a larger fixing area. That is, a curved surface is formed in the vicinity of the fixing piece 26 on the inner peripheral surface of the frame portion 30 to improve the fixing strength to the filter sheet 16 .
  • the filter member 12 Since the filter member 12 is provided with the bead portions 28, the folded shape of the filter member 12 is stabilized. has become easier.
  • the two bead portions 28, 28 are provided at positions separated from each other in the left-right direction, thereby further improving the shape stability of the filter member 12 and facilitating the handling of the filter member 12. transformation has been realized.
  • the fixing protrusions 36 of the frame portion 30 protrude toward the bead portions 28 of the filter member 12 and are pressed against the bead portions 28 .
  • the ends of the bead portions 28 are melted by the heat generated when the fixing projections 36 are molded, and the bead portions 28 and the fixing projections 36 are fixed so as to be integrated. A large fixing strength is ensured.
  • the portion of the filter member 12 where the bead portion 28 is provided has high shape stability, even if the fixing protrusion 36 is pressed against the bead portion 28 by the injection molding pressure when the frame portion 30 is molded, the filter member 12 is The shape change of the member 12 is suppressed, and the pleated shape is maintained.
  • the cavity of the plate-like portion 40 is provided with an injection port for the resin material, and the resin material that is injected from the injection port and flows toward the inner circumference contacts and is fixed to the filter member 12 . Since the filling pressure of the resin material during injection molding increases closer to the injection port, a larger filling pressure acts on the filter member 12 at the portion fixed to the rear end of the frame portion 30 than to the portion fixed to the front end. do. Therefore, the groove-shaped portions 44, 44 opening on the rear surface of the plate-shaped portion 40 are provided on the inner peripheral side closer to the filter member 12 than the left and right inlet marks 45, 45, and the second edge of the filter sheet 16 is provided.
  • the grooves 44 , 44 extend vertically between the left and right inlet marks 45 , 45 and the second edge portions 24 , 24 of the filter member 12 .
  • the resin material flowing from the injection port toward the inner circumference is restricted by the molds for forming the groove-shaped portions 44, 44 so that a large filling pressure is applied to the second edge portion of the filter member 12. 24, 24 can be prevented from acting directly.
  • deformation of the filter member 12 due to high-pressure filling of the resin material, entry of the resin material into the overlapping surfaces of the comb-shaped mold and the filter member 12, and the like are prevented.
  • the groove-shaped portion 44 is formed at a position close to the boundary between the frame portion 30 and the plate-shaped portion 40, the thickness of the vicinity of the boundary is made thin, so that the frame portion 30 and the plate-shaped portion having different shapes are formed. It is possible to reduce or avoid transmission of stress and deformation in the vicinity of the boundary with 40, and improvement in mutual shape stability can also be expected.
  • the injection pressure of the resin material can be set small, and the filter member set in the mold can be The molding pressure of the resin acting on the filter member 12 is distributed to each side portion (the first edge portions 22, 22 and the second edge portions 24, 24) of the filter member 12, thereby preventing the filter member 12 from being deformed.
  • the injection ports are positioned on the outer peripheral side of each side of the frame portion 30, for example, the injection ports may be provided at two locations, and the injection ports may be provided on the outer periphery of the side that is particularly vulnerable to the molding pressure. can.
  • the frame portion 30 is reinforced by the plurality of rib-shaped portions 34, deformation of the frame portion 30 due to heat shrinkage after molding is suppressed, and the shape of the filter member 12 is maintained. As a result, the effective area of the filter member 12 can be prevented from being reduced due to deformation, and the desired air permeability can be ensured. Moreover, if the frame portion 30 is an elastic body, the deformation of the frame portion 30 due to the application of an external force may adversely affect the fixation with the filter sheet 16 . Deformation is made difficult to occur, and adhesion peeling between the frame portion 30 and the filter sheet 16 is made difficult to occur.
  • the frame portion 30 since the frame portion 30 has a square tubular shape, the strength (deformation rigidity) of the frame portion 30 tends to be smaller at the side portions than at the corner portions. is provided, the deformation rigidity of the frame portion 30 can be effectively increased by a structure that is lighter than the case where the entire frame portion 30 is thickened.
  • the rib-like portions 34 may be formed so as to extend in the circumferential direction, it is preferable to form them so as to extend in the axial direction because more rib-like portions 34 can be formed.
  • the rib-shaped portion 34 can also be used to push the support 14 out of the mold by pressing a demolding pin.
  • the filter unit 10 of this embodiment since the filter member 12 is composed of the folded pleated filter sheet 16, the effective area of the filter sheet 16 is large, and the air permeability is improved. be done. Therefore, by adopting the filter sheet 16 with a large basis weight, it is possible to improve the collection efficiency and reduce the suffocation during wearing, and the medical mask equipped with the filter unit 10 can be worn for a long time. As a result, it is possible to prevent the invasion of viruses and the like for a long period of time.
  • the height dimension of the ridges and valleys (pleats) of the filter sheet 16 is preferably larger than half of the inner dimension or outer dimension in the width direction or the vertical direction of the frame part 30, and the plate-shaped part including the seal part 42 40 or smaller than the radius of the plate-shaped portion 40 including the seal portion 42, the filter member 12 of an appropriate size for the mask can provide a large effective area. good breathability can be obtained.
  • the front end of the frame portion 30 projects forward from the front end of the filter member 12 accommodated in the frame portion 30 in the longitudinal direction, which is the axial direction of the frame portion 30 .
  • the step surface 38 of the frame portion 30 is positioned substantially at the same position as the rear end of the filter member 12 in the axial direction of the frame portion 30 , and the portion of the rear surface of the frame portion 30 that is outside the step surface 38 is the filter member 12 . It is positioned so as to protrude rearward from the rear end. In this manner, both ends of the frame portion 30 in the axial direction protrude axially outward from the filter member 12 , so that the filter member 12 is protected by the frame portion 30 .
  • the filter member 12 can be prevented from coming into contact with the filter support member 48 and being deformed.
  • the axial front end of the frame portion 30 is located on the front side of the front top portion 20 of the filter member 12 which is folded over the entire circumference, and the axial rear end of the frame portion 30 is positioned on the entire circumference. It is positioned on the rear side of the top portion 20 on the rear side of the filter member 12 over the entire length.
  • the entire periphery of the filter member 12 is covered with the frame portion 30, and the filter member 12 is protected over the entire periphery by the axial ends of the frame portion 30, preventing the filter member 12 from contacting other members or the like. is effectively prevented.
  • the filter unit 10 is configured such that the seal portion 42 of the support 14 is sandwiched between the first member 50 and the second member 52 that constitute the filter support member 48 . It is attached to the filter support member 48 in a sealed state with respect to the support member 48 . That is, as shown in FIG. 11A , the filter unit 10 is inserted into the accommodation recess 54 provided in the first member 50 at the rear portion including the plate-shaped portion 40 . With the filter unit 10 inserted into the accommodation recess 54 , the clamping portion 56 of the second member 52 inserted from the front into the accommodation recess 54 is pressed against the seal lip 43 of the seal portion 42 .
  • the seal portion 42 is sandwiched between the bottom wall of the housing recess 54 and the sandwiching portion 56 in the front-rear direction and compressed.
  • the holding portion 56 may be pressed so that the central portion thereof is positioned at the top portion of the seal lip 43 , but the holding portion 56 has a center portion which is radially inner than the top portion of the seal lip 43 formed in an annular shape. may be pressed. According to this, the seal lip 43 pressed by the clamping portion 56 is more reliably deformed radially outward, making it easier to realize the second seal structure 60 to be described later.
  • the seal portion 42 is pressed against and adheres to the first member 50 in the sandwiching direction of the seal portion 42 which is the axial direction of the frame portion 30, and the rear surface of the first member 50 and the seal portion 42 is in close contact.
  • a first seal structure 58 is provided to seal the gap.
  • the sandwiched and crushed seal portion 42 spreads toward the outer peripheral side, which is the direction crossing the crushing direction, and is pressed against the inner surface of the peripheral wall of the accommodation recess 54 in the first member 50 to be in close contact.
  • a second seal structure 60 is provided to seal between the first member 50 and the outer peripheral surface of the seal portion 42 .
  • the seal portion 42 By sandwiching the seal portion 42 between the first member 50 and the second member 52 in this way, double seal structures 58 and 60 are formed, and airtightness between the filter support member 48 and the filter unit 10 is achieved. reliability is ensured with a higher degree of reliability. In order to achieve such a double seal, it is desirable that the seal portion 42 be made of a material having a Poisson's ratio close to 0.5.
  • the entire support body 14 is an integrally molded product made of an elastic material. are arranged to surround the entire circumference.
  • the seal portion 42 that constitutes the seal structures 58 and 60 for the filter support member 48 is integrated with the frame portion 30 that houses the filter member 12, and surrounds the entire circumference of the frame portion 30. Seal structures 58, 60 are provided. As a result, the intake air can be guided to pass through the filter member 12 without fail, for example, between the frame portion 30 and the seal portion 42 .
  • the plate-shaped portion 40 is made thinner toward the outer periphery, and the seal portion 42 provided on the outer periphery of the plate-shaped portion 40 is made thinner than the inner peripheral end portion of the plate-shaped portion 40, so that the filter unit When mounting 10 between the first and second members 50 and 52, the compressive deformation of the seal portion 42 is facilitated, and the sealing performance is more stably and effectively exhibited.
  • the plate-shaped portion 40 will not move. It is easily deformable, and assembly failure of the second member 52 is prevented, and sealing performance due to compression of the seal portion 42 (seal lip 43) is stably exhibited.
  • FIGS. 12 to 15 show an example of a half-face mask 80 provided with the filter unit 10 according to the first embodiment.
  • the mask 80 includes a mask body 82 that covers the wearer's mouth and nose, and a band 84 that positions and holds the mask body 82 against the wearer's A face.
  • the mask main body 82 includes a facepiece 86 to be worn on the face of the wearer A, and the filter unit 10 held by the facepiece 86 .
  • the facepiece 86 includes a filter support member 48 that supports the filter unit 10 and a face contact member 88 arranged between the filter support member 48 and the wearer's A face.
  • the filter support member 48 has a split structure including a first member 50 connected to the face contact body 88 and a second member 52 covering the front opening of the first member 50. It is said that
  • the first member 50 includes a substantially cylindrical peripheral wall 90 and an annular plate-shaped plate contact portion 92 protruding from the peripheral wall 90 toward the inner periphery.
  • the plate contact portion 92 is not necessarily limited to a ring plate shape continuous over the entire circumference, and may be partially provided in the circumferential direction of the peripheral wall 90, for example.
  • the filter unit 10 is inserted into the inner peripheral side of the peripheral wall 90 of the first member 50 , and the plate-like portion 40 of the filter unit 10 is overlaid on the front surface of the plate contact portion 92 of the first member 50 .
  • the radial relative movement of the filter unit 10 with respect to the first member 50 is restricted by the contact between the plate-shaped portion 40 and the peripheral wall 90 .
  • the second member 52 includes a tubular wall portion 94 and a front wall portion 96 that covers the front opening of the tubular wall portion 94, and has a generally bottomed cylindrical shape as a whole.
  • a plurality of vent holes 98 are formed through the front wall portion 96 .
  • the opening shape of the vent hole 98 is not particularly limited, but in the present embodiment, as shown in FIG. It is
  • the tubular wall portion 94 of the second member 52 is detachably connected to the peripheral wall 90 of the first member 50 .
  • the cylindrical wall portion 94 of the second member 52 is inserted into the peripheral wall 90 of the first member 50, and protrudes to the inner peripheral surface of the peripheral wall 90.
  • the inner peripheral protrusion 100 of the first member 50 and the outer peripheral protrusion 102 of the second member 52 protruding from the outer peripheral surface of the cylindrical wall portion 94 are locked in the front-rear direction.
  • the peripheral wall 90 of the first member 50 is deformed to expand in diameter, or the tubular wall portion 94 of the second member 52 is deformed to contract in diameter, so that the inner peripheral protrusion 100 and the outer peripheral protrusion are connected.
  • the second member 52 can be removed from the first member 50 by releasing the engagement with the portion 102 .
  • the detachable connecting structure of the first member 50 and the second member 52 is not limited to the structure illustrated in FIGS.
  • connection by fitting a concave portion (including a concave groove or a through hole) and a convex portion provided in each one of the peripheral wall 90 and the cylindrical wall portion 94 connection by a screw structure, and connection to the peripheral wall 90 Connection by frictional resistance by fitting the cylindrical wall portion 94 may be adopted.
  • the rear end of the cylindrical wall portion 94 of the second member 52 is pressed against the plate-shaped portion 40 of the filter unit 10 from the front, and the plate-shaped portion 40 is pushed from the front. It is sandwiched between the plate contact portion 92 of the member 50 and the tubular wall portion 94 of the second member 52 .
  • the overlapping surfaces of the plate contact portion 92 of the first member 50 and the plate-shaped portion 40 of the filter unit 10 are airtightly sealed, and outside air bypasses the filter member 12 to allow the face contact member 88 to pass through.
  • the cylindrical wall portion 94 of the second member 52 is provided with a position defining portion 104 protruding to the outer periphery. Since the relative positions of the first member 50 and the second member 52 in the front-rear direction are defined, the compressive force acting on the plate-shaped portion 40 (the amount of compressive deformation of the plate-shaped portion 40) is appropriately set.
  • the plate-like portion 40 of the support 14 is sandwiched between the first member 50 and the second member 52 , while the portion other than the plate-like portion 40 is separated from the first member 50 and the second member 52 .
  • the plate contact portion 92 of the first member 50 is arranged at a position away from the filter member 12 on the outer periphery, and the front wall portion 96 of the second member 52 is separated forward from the filter member 12. are placed in the same position. Thereby, the effective surface area of the filter member 12 is efficiently secured.
  • a face contact member 88 is attached to the rear end portion of the filter support member 48 housing the filter unit 10, as described above.
  • the face-contact member 88 is made of rubber, resin elastomer, or the like, and is softer than the filter support member 48 and flexibly deformable, and an elastic material is preferably used.
  • the face-contact member 88 has an annular shape that is tightly fitted around the mouth of the mask wearer's face when the mask is worn. When the face piece 86 has a half-face shape, the face piece 88 can be brought into close contact with the face so that the nose and mouth are positioned on the inner circumference of the face piece 88 and the eyes are positioned on the outer circumference of the face piece 88. shape.
  • the face piece 88 When the face piece 86 is a full face piece, the face piece 88 has a shape that allows close contact with the face so that the nose, mouth, and eyes are all located on the inner circumference of the face piece 88 .
  • the face contact member 88 has flexibility to follow the curvature and unevenness of the mask wearer's face when the mask is worn, and has elasticity to maintain close contact with the face of the mask wearer.
  • the face contact member 88 is airtightly connected to the rear end of the peripheral wall 90 of the first member 50 of the filter support member 48 .
  • connection structure between the filter support member 48 and the face contact member 88 is not particularly limited, for example, a face piece connection structure 108 using a ring member 106 as shown in FIGS.
  • the facepiece connecting structure 108 presses the ring member 106 from behind against the front end of the face-fitting body 88 superimposed on the rear end of the filter support member 48 , so that the front end of the face-fitting body 88 joins the filter support member 48 and the ring.
  • the filter support member 48 and the ring member 106 By fixing the filter support member 48 and the ring member 106 by means of welding or the like while sandwiching it between the filter support member 48 and the member 106, the entire circumference between the filter support member 48 and the face contact member 88 is airtightly sealed. It is a connecting structure that connects. In this way, instead of directly fixing the face contact member 88 to the filter support member 48, the structure is such that the face contact member 88 is sandwiched between the filter support member 48 and the ring member 106, which are fixed to each other. While ensuring the strength of connection between the filter support member 48 and the face contact member 88, a large degree of freedom in selecting materials for forming the filter support member 48 and the face contact member 88 can be obtained. In addition, variations in sealing performance due to welding quality between the filter support member 48 and the face contact member 88 can be avoided, and excellent sealing performance can be stably obtained.
  • a band 84 is attached to the filter support member 48 .
  • the band 84 is belt-shaped or string-shaped, and preferably has stretchability, so that the load during wearing can be reduced.
  • the band 84 is inserted through a band insertion portion 110 provided on the filter support member 48 .
  • the band insertion portions 110 are desirably provided on both left and right sides of the filter support member 48, for example, at the rear end portion of the first member 50.
  • the left and right bands 84, 84 inserted through the band insertion portion 110 are releasably connected around the wearer's head and neck, thereby allowing the mask main body 82 to be removed from the wearer's face. It is worn in a suitable manner.
  • the means for connecting the left and right bands 84, 84 is not particularly limited, and the left and right bands 84, 84 may be connected by tying them together, or the left and right bands 84, 84 may have a connecting structure such as a buckle in advance. may be provided. Also, the band 84 inserted through the left and right band insertion portions 110, 110 may be integrally connected. Ease and the ability to hold the mask body 82 in place can be achieved.
  • the filter unit 10 shown in the first embodiment can be a reusable filter unit for reusable masks. When reusing the filter unit 10, for example, it is necessary to clean the filter member 12 by reducing bacteria and viruses adhering to the filter member 12 of the used filter unit 10.
  • FIG. 10 When reusing the filter unit 10, for example, it is necessary to clean the filter member 12 by reducing bacteria and viruses adhering to the filter member 12 of the used filter unit 10.
  • the disinfectant is a liquid used for sterilizing bacteria, viruses, and the like, and is not particularly limited.
  • disinfectants such as alcohol and sodium hypochlorite, and hypochlorous acid water are preferably used.
  • various conditions for spraying the disinfectant and subsequent treatments can be appropriately set according to the disinfectant to be used.
  • UV sterilization or the like by irradiating ultraviolet rays can be adopted, but spraying a disinfectant solution is preferable because the equipment and process are simple.
  • the height dimension H of the frame portion 30 is set to 20 mm or more, preferably 25 mm or more, and the inner dimension W of the frame portion 30 (the distance between the opposing inner surfaces of the frame portion 30 is 2.5 times or less, preferably 2 times or less of the height dimension H of the frame portion 30 in the axial direction.
  • the frame portion 30 of the present embodiment has an elongated cylindrical shape.
  • the spray of the disinfectant solution tends to stay in the frame 30, space disinfection can be efficiently generated in the frame 30, and the part where the spray is difficult to adhere directly (pleated
  • the sterilizing effect can also be induced at the end of the filter in the continuous direction or width direction, the opposite surface of the side facing the spray, the vicinity of the frame 30, and the vicinity of the corner. In this way, by focusing on the new perspective of space disinfection for the mask filter, the entire filter can be efficiently disinfected, and a reusable mask that has not existed before can be realized.
  • the height dimension H of the frame portion 30 is preferably set to 50 mm or less, so that when a reusable mask including the filter unit 10 is worn, a filter mounting portion (described later) that accommodates the filter unit 10 is positioned in front of the face. A good field of view is ensured by avoiding a large protrusion to the side and making it difficult to block the field of view.
  • the height dimension H of the frame portion 30 is made larger than the height dimension h of the filter member 12 accommodated in the inner circumference of the frame portion 30.
  • Both ends of the frame portion 30 in the axial direction protrude further outward in the axial direction than the filter member 12 .
  • the filter member 12 is accommodated in the inner circumference of the frame portion 30 without protruding from the frame portion 30 .
  • the disinfectant when the disinfectant is sprayed from the outside in the axial direction onto the filter member 12 housed in the frame portion 30 having an elongated cylindrical shape, the disinfectant becomes fine spray particles (including vaporized matter). It adheres to the surface of the filter member 12 and kills and reduces bacteria, viruses, etc. adhering to the surface of the filter member 12 . Since the internal space of the frame portion 30 that houses the filter member 12 has a relatively small opening area to the outside and a large axial height, the spray is sprayed toward the filter member 12 within the frame portion 30 . The sprayed particles of the disinfectant are difficult to escape from the internal space of the frame 30 to the outside, and tend to remain in the internal space of the frame 30 .
  • the sprayed particles of the disinfectant solution stay in the inner space of the frame 30 and diffuse into the inner space, so that the sprayed particles of the disinfectant solution adhering to the surface of the filter member 12 increase and the surface of the filter member 12 increases. can be effectively disinfected.
  • the fold-back structure has a pleated shape in which the ridges and valleys are continuous, and the gaps between the ridges and valleys are structured so as to expand substantially outward. The liquid can easily reach deep into the gap, and the disinfectant liquid can be easily sprayed directly over substantially the entire filter surface.
  • the disinfecting solution can enter even the bottom of the deep valleys of the filter member 12 substantially evenly, thereby achieving the intended disinfecting effect of the pleats. It can be stably obtained over the entire area including narrow areas such as valleys.
  • the filter member 12 of this embodiment is provided with the bead portion 28 that holds the ridges and valleys of the pleats, the gaps between the folded ridges and valleys are held by the bead portions 28, and the gaps between the ridges and valleys are locally It is possible to prevent large constriction or crushing, and the entire surface of the ridges and valleys can be more stably disinfected with the disinfectant.
  • the filter sheet 16 that constitutes the filter member 12 for example, when the disinfectant solution is sprayed from only one side, at least the surface on which the disinfectant solution is sprayed (more preferably both sides) is made of nonwoven fabric. is desirable. Since the non-woven fabric has countless fine fibers protruding from the surface, the sprayed particles of the disinfectant solution floating in the frame 30 are easily captured by the protruding fine fibers, and the sprayed particles of the disinfectant solution do not reach the surface of the filter sheet 16. By making it easier to adhere, a disinfecting effect can be advantageously obtained.
  • a reusable filter unit for a mask can also be used in the same way even if the filter unit is for a non-medical application. can.
  • the filter unit 10 constitutes a mask, for example, in the mask disclosed in Japanese Unexamined Patent Application Publication No. 2002-239018, by being housed in a filter mounting portion provided on the facepiece of the mask.
  • a reusable mask that can be used multiple times can be obtained.
  • the filter unit 10 may be detachably attached to the filter attachment portion of the mask, or may be fixedly attached to the filter attachment portion.
  • the disinfectant solution may be sprayed on the filter member 12 taken out from the filter mounting portion, but the filter member 12 may be left attached to the mask.
  • the disinfectant may be sprayed onto the filter member 12 through the intake hole of the filter mounting portion or the like.
  • Staphylococcus aureus manufactured Microbiologies, Inc., strain ATCC6538
  • Staphylococcus aureus manufactured Microbiologies, Inc., strain ATCC6538
  • 1 McFarland 3 ⁇ 10 8 FCU / mL
  • spray bottle manufactured by the manufacturer
  • 0.28 mL/ Spray only once with one spray amount.
  • the reusable mask sprayed with the fungal solution is dried for about 4 hours in an aseptic environment with a temperature of 20° C. to 25° C. and a relative humidity of about 50% RH.
  • test liquid (the test liquid is "no test liquid” (control), "injection Five types of water”, “30 ppm hypochlorous acid water”, “83 vol% ethanol”, and “70 vol% isopropanol”) are sprayed from the front five times, and the same spray bottle is used to apply the test liquid to the four sides of the frame 30. Spray once to the corresponding site at a spray volume of 0.28 mL/time. Next, leave the reusable mask in a sterile environment with a temperature of 20° C. to 25° C. and a relative humidity of about 50% RH under windless conditions for 3 minutes.
  • aqueous solution containing sodium thiosulfate, 3% lecithin, and 10% polysorbate 80 is placed in a sterilized bag and kneaded by hand for 1 minute to extract Staphylococcus aureus. Finally, a 10-fold dilution series of the extract was prepared with water for injection, and cultured on SCD agar medium (manufacturer: Merck Co., Ltd., product name: Tryptic Soy Agar-ICR 30 ml) at 37° C. for 2 days. counted.
  • Tables 1 and 2 below show the results of such experiments.
  • Table 1 shows the number of viable Staphylococcus aureus bacteria in experiments using each test solution
  • Table 2 shows the case where the test solution is not sprayed with the test solution as a control, and the yellow color when other test solutions are used. Staphylococcal log reduction values are shown, respectively.
  • the present invention is not limited by the specific descriptions.
  • the number of crests and troughs on the folded back of the filter member 12 is appropriately set according to the required air permeability and collection efficiency.
  • the inclined portion 21 of the filter member 12 does not necessarily have to have a linearly extending flat shape, and may be curved or bent, for example.
  • the shape of the inclined portion 21 can be changed or varied relatively easily. Even in the case of being bent, bending or the like may occur. Therefore, the plurality of ridges and valleys do not necessarily have the same shape, and variations in shape may occur.
  • the number of bead portions 28 can be appropriately changed as needed. Specifically, for example, in order to further increase the shape stability of the filter member 12, three or more bead portions 28 may be provided, or the filter sheet 16 may be formed by providing one bead portion 28 or eliminating the bead portion 28. A large effective area can also be obtained. Further, the formation position of the bead portion 28 is not limited, and for example, it may be provided in the center of the filter member 12 in the left-right direction.
  • the frame part 30 is not limited to a square tubular shape, and may be a cylindrical shape, a polygonal tubular shape other than a square tubular shape, an irregularly shaped tubular shape, or the like.
  • the outer peripheral shape of the filter member 12 is a shape corresponding to that of the frame portion 30 .
  • the support 14 in which the frame portion 30, the plate-like portion 40, and the seal portion 42 are integrally formed was exemplified, but the support 14 may have a structure in which a plurality of parts are combined.
  • the plate-like portion 40 made of an elastic material may be fixed to the hard frame portion 30, or the frame portion 30 and the plate-like portion 40 may be made hard, and the rear surface of the plate-like portion 40 may be elastic.
  • An O-ring-shaped sealing portion consisting of a body may be arranged.
  • the frame portion 30, the plate-shaped portion 40, and the seal portion 42 are formed separately from each other, and the frame portion 30, the plate-shaped portion 40, and the seal portion 42 are fixed to form the support body 14. can also be formed.
  • the plate-shaped portion 40 including the seal portion 42 may be provided in the axial middle of the frame portion 30 . Further, for example, without the plate-shaped portion 40, a ridge-shaped sealing portion protruding over the entire circumference is provided on the rear surface of the frame portion 30, and the rear surface of the frame portion 30 is pressed against the filter support member 48. A seal may be provided between the support 14 and the filter support member 48 .
  • the seal portion 42 preferably has an annular shape in order to prevent variations in sealing performance in the circumferential direction, but may have a polygonal annular shape or an irregularly shaped annular shape. Also, the seal lip 43 is not essential in the seal portion 42 .
  • the groove-like portion 44 may be open on the rear surface of the frame portion 30 .
  • the groove-shaped portion 44 may be provided between the upper and lower inlet marks 45 , 45 and the filter member 12 .
  • the grooved portion 44 may be an annular groove continuous in the circumferential direction of the frame portion 30 .
  • the injection port mark 45 may be formed on the rear surface of the frame portion 30 in the same manner as the groove-shaped portion 44 . provided so as to open to the The number of injection hole traces 45 to be formed, their arrangement in the circumferential direction, etc. can be appropriately changed according to the molding conditions of the support 14 and the like.
  • the filter unit 10 does not necessarily have to be separate from the face piece of the mask.
  • the support 14 of the filter unit 10 may also serve as the face piece of the mask.
  • the user-side mounting portion of the support 14 is formed in an appropriate shape, and the user-side mounting portion is molded into a suitable shape.
  • the support 14 is provided with a string or the like for holding the support 14 in a state of being attached to the user's face.
  • the present invention is suitably applied to medical masks for preventing virus infection.
  • it can also be adopted in the artificial respirator field.
  • the present invention can be applied to an artificial nose, and can solve the problem in the field of artificial noses that air permeability decreases due to pressure loss.
  • the plate-shaped portion 40 has a substantially rectangular inner peripheral shape and a substantially circular outer peripheral shape.
  • a pair of groove-shaped portions 44, 44 extending linearly are provided.
  • the plate-like portion 40 is shaped like a plate and protrudes from the rear end portion of the frame portion 30 to the outer periphery, so that it is recognized as one portion with a coherent design.
  • the plate-like portion 40 has a specific function of air-tightly attaching the frame portion 30 holding the filter member 12 to the filter support member 48. In addition to being connected, there is an effect that airtight connection to the filter support member 48 is achieved while miniaturizing the filter support member 48 at the substantially circular outer peripheral end.
  • the plate-like portion 40 has a seal lip 43 on its outer periphery, thereby realizing sealing without requiring a separate component such as an O-ring. Note that the pair of groove-shaped portions 44, 44 are not essential elements of the design.
  • the support 14 has a frame portion 30 formed in a substantially rectangular cylindrical shape and an inner circumference of a plate-like portion 40 having a circular outer shape and a substantially rectangular inner shape. It protrudes forward from the end and is integrally provided.
  • a plurality of rib-shaped portions 34 are provided in the circumferential direction of the frame portion 30 so as to protrude from the outer peripheral surface of the frame portion 30 and extend in the longitudinal direction, which is the axial direction of the frame portion 30 .
  • the support body 14 integrally includes the frame portion 30, the plate-like portion 40, and the rib-like portion 34, and can be recognized as a single member with a coherent design as a whole.
  • the support 14 is a member having a specific function of connecting the filter member 12 and the filter support member 48 , and the outer peripheral end of the filter member 12 is hermetically sealed by the frame portion 30 reinforced by the rib-shaped portion 34 .
  • the plate-shaped portion 40 having a circular outer shape has the effect of enabling airtight attachment to the filter support member 48 while miniaturizing the filter support member 48 .
  • the support body 14 was conventionally composed only of the frame portion 30 for holding the filter member 12, and the substantially rectangular cylindrical frame portion 30 and the outer peripheral surface of the frame portion 30, which were not conventionally available.
  • the rib-shaped portion 34 that protrudes and extends and the plate-shaped portion 40 that has a substantially rectangular inner peripheral shape corresponding to the frame portion 30 and a substantially circular outer peripheral shape that does not correspond to the frame portion 30 are integrally provided. also attract the attention of the caregiver.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pulmonology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Anesthesiology (AREA)
  • Hematology (AREA)
  • Emergency Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Zoology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Textile Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
PCT/JP2022/004331 2021-02-05 2022-02-03 医療用フィルタユニットとその製造方法およびリユースマスク用のフィルタユニットとそれを用いたリユースマスク Ceased WO2022168932A1 (ja)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008137009A (ja) * 2008-01-15 2008-06-19 Nitto Denko Corp エアフィルタユニットおよびその製造方法、並びにエアフィルタユニット集合体
KR20090081555A (ko) * 2008-01-24 2009-07-29 정성봉 에어크리너
JP2020506734A (ja) * 2016-12-19 2020-03-05 スリーエム イノベイティブ プロパティズ カンパニー 呼吸マスク用フィルタ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008137009A (ja) * 2008-01-15 2008-06-19 Nitto Denko Corp エアフィルタユニットおよびその製造方法、並びにエアフィルタユニット集合体
KR20090081555A (ko) * 2008-01-24 2009-07-29 정성봉 에어크리너
JP2020506734A (ja) * 2016-12-19 2020-03-05 スリーエム イノベイティブ プロパティズ カンパニー 呼吸マスク用フィルタ

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