Sealing strip, respirator mask, and method for manufacturing sealing strip

Abstract

The present invention relates to a sealing strip, a respiratory mask, and a method for manufacturing a sealing strip. The sealing strip includes a main body portion having an upper surface, a lower surface, a first side surface, and a second side surface opposite the first side surface. The main body portion includes a curved portion. The curved portion includes a first convex portion and a second convex portion, the first convex portion and the second convex portion being connected to each other in the longitudinal direction of the sealing strip and defining a recess therebetween. The recess is configured to accommodate a wearer's nose. The first convex portion and the second convex portion are symmetrical with respect to the recess. The first side surface of the curved portion is a constant amplitude sinusoidal curve extending in the longitudinal direction of the sealing strip. The sealing strip, respiratory mask, and method for manufacturing a sealing strip according to the present invention can simplify the manufacturing process of the sealing strip, achieve maximum material utilization, improve the seal between the respiratory mask and the wearer's face, and increase the comfort of wearing the respiratory mask.

Description

[Technical Field]

[0001] The present invention relates to the field of personal protection, and in particular to a sealing strip, a respiratory mask with a sealing strip, and a method for manufacturing a sealing strip. [Background technology]

[0002] The material in this section merely provides background information related to the present invention and does not necessarily constitute prior art.

[0003] As a commonly used protective article, respirators are often used to protect against dust, fumes, bacteria, etc., and are widely used in specific work environments and daily life. When a respirator is worn, it ideally fits the wearer's facial contours to form a good seal between the respirator and the wearer's face. However, the contours of the wearer's face are not regular and vary greatly from one wearer to another. In particular, the contours of the nose are complex and vary, making it difficult to form a good seal with the respirator. In many cases, gaps exist between the respirator and the wearer's nose, resulting in an insufficient seal. As a result, on the one hand, dust, fumes, or bacteria in the wearer's environment can pass through the gaps and come into contact with the wearer and be inhaled by the wearer, thereby affecting the protective effect of the respirator. On the other hand, the wearer's exhaled breath also passes through the gaps and is expelled upward. If the wearer wears glasses, if the temperature inside the respirator is higher than the ambient temperature, the exhaled breath can fog the glasses, affecting the wearer's wearing experience.

[0004] Therefore, in order to improve the protective effect of a respirator and enhance the wearing experience, it is expected that the respirator can fit the contours of the wearer's face and achieve a good seal between the respirator and the wearer's face. Existing respirator masks use a metal or plastic nose strip with a memory effect. When this type of respirator is worn, applying pressure to this part of the respirator causes the nose strip of the respirator to deform to fit the contours of the wearer's nose, thereby pressing and fitting the respirator to the wearer's face, thereby improving the seal between the respirator and the wearer's nose. However, the pressure applied to the wearer's nose by the nose strip of such a respirator tends to cause discomfort to the wearer and can easily cause dents or even injuries to the wearer's face. This situation is particularly noticeable when the respirator is worn for a long period of time.

[0005] Therefore, it is desirable to improve the wearing comfort and sealing performance of respirators. Summary of the Invention

[0006] It is an object of the present invention to provide an improved sealing strip and a respirator equipped with the sealing strip, which improves the wearing comfort of the respirator, improves the sealing performance of the sealing strip, and improves the seal between the respirator and the wearer's face. Another object of the present invention is to provide a method for manufacturing a sealing strip, a sealing strip manufactured thereby, and a respirator, which simplify the manufacturing of the sealing strip, improves the wearing comfort of the respirator, improves the sealing performance between the respirator and the wearer's face, alleviates the problem of fogging of the wearer's glasses, and improves the utilization of the raw materials of the sealing strip.

[0007] One aspect of the present invention provides a sealing strip for a respiratory mask. The sealing strip includes a main body portion having an upper surface, a lower surface, a first side, and a second side opposite the first side. The second side is attached to a respiratory mask body of the respiratory mask with the first side facing the wearer, and the sealing strip covers at least a portion of the peripheral edge of the respiratory mask body that is to contact the wearer's face. The main body portion includes a curved portion, the curved portion including a first convex portion and a second convex portion, the first convex portion and the second convex portion being connected to each other in the longitudinal direction of the sealing strip to define a recess located between the first convex portion and the second convex portion. The recess is configured to accommodate the wearer's nose, the first convex portion and the second convex portion being symmetrical with respect to the recess, and the first side of the curved portion is a constant amplitude sinusoidal curve extending in the longitudinal direction of the sealing strip. Preferably, the curved portion is integrally formed.

[0008] The distance between the first and second sides of the curved portion is the thickness of the curved portion, and the minimum thickness of the curved portion at both longitudinal ends of the sealing strip is equal to the minimum thickness of the curved portion at the recess.

[0009] In one embodiment, the body further includes a first extension and a second extension, each located on either side of the curved portion in the longitudinal direction of the sealing strip, the first extension extending from the first convex portion to the first end of the sealing strip, and the second extension extending from the second convex portion to the second end of the sealing strip. The distance between the first side and the second side of the first extension and / or the second extension is constant or variable.

[0010] In one embodiment, the first extension and the second extension have the same profile.

[0011] The first extension, the curved portion, and the second extension are integrally formed. Alternatively, the first extension, the curved portion, and the second extension are formed separately and attached to one another.

[0012] In one embodiment, the first extension, the curved portion, and the second extension collectively cover the entire periphery of the mask body that is to contact the wearer's face.

[0013] Preferably, the distance between the upper and lower surfaces of the curved portion is 6 mm to 14 mm. Preferably, the length of the curved portion in the longitudinal direction of the sealing strip is 90 mm to 130 mm. Preferably, in the recess, the minimum distance between the first side surface and the second side surface of the curved portion is 1 mm to 6 mm. Preferably, the maximum distance between the first side surface and the second side surface of the first convex portion and the second convex portion is 4 mm to 10 mm larger than the minimum distance between the first side surface and the second side surface of the curved portion.

[0014] In one embodiment, the sealing strip further comprises an airtight layer and a fixing layer, the airtight layer being fixed to one of the upper and lower surfaces of the main body portion by the fixing layer, and when the sealing strip is attached to the respiratory mask, the airtight layer of the sealing strip is located on the outer periphery.

[0015] Another aspect of the present invention is to provide a respiratory mask comprising a respiratory mask body, the respiratory mask further comprising a sealing strip for a respiratory mask according to the present invention, the sealing strip being attached to the respiratory mask body so as to cover at least a portion of a periphery of the respiratory mask body that is to contact the wearer's face.

[0016] Another aspect of the present invention is to provide a method for manufacturing a sealing strip, the method comprising the steps of providing a first piece of material and cutting the first piece of material to prepare a body portion of the sealing strip, the body portion having an upper surface, a lower surface, a first side, and a second side opposite the first side, the second side being attached to a respirator body of a respiratory mask with the first side facing a wearer, and the sealing strip covering at least a portion of a periphery of the respirator body that is to contact the wearer's face. The body portion is cut to have a curved portion, the curved portion including a first convex portion and a second convex portion, the first convex portion and the second convex portion being connected to each other in a longitudinal direction of the sealing strip and defining a recess located between the first convex portion and the second convex portion, the recess being configured to accommodate the wearer's nose, the first convex portion and the second convex portion being symmetrical about the recess, and a first side of the curved portion being a constant amplitude sinusoidal curve extending in the longitudinal direction of the sealing strip. Preferably, the curved portion is integrally formed.

[0017] The step of cutting the first piece of material includes cutting the first piece of material along a first cutting line, a second cutting line, and a third cutting line, respectively, to form a first strip and a second strip that mate with each other along the second cutting line. The first cutting line and the third cutting line are straight lines parallel to each other, the second cutting line is located between the first cutting line and the third cutting line, and the second cutting line includes one or more sinusoidal sections, and the first strip and the second strip each include at least one curved section having the same contour as the curved portion. The step of cutting the first piece of material further includes cutting the first strip and the second strip to form a sealing strip including the curved portion.

[0018] In one embodiment, the distance between the first and second sides of the curved portion is the thickness of the curved portion, and the minimum thickness of the curved portion at both longitudinal ends of the sealing strip is equal to the minimum thickness of the curved portion at the recess.

[0019] In one embodiment, the period of the sinusoidal sections is constant.

[0020] In one embodiment, the second cutting line further comprises additional line sections alternating with sinusoidal sections.

[0021] In one embodiment, the main body portion further includes a first extension portion and a second extension portion located on either side of the curved portion in the longitudinal direction of the sealing strip, and the step of cutting the first piece of material further includes a step of cutting the main body portion from the first strip and the second strip, respectively, so that the first extension portion, the curved portion, and the second extension portion are integrally formed.

[0022] In one embodiment, the main body portion further includes a first extension and a second extension located on either side of the curved portion in the longitudinal direction of the sealing strip, and cutting the first piece of material further includes cutting curved sections from the first strip and the second strip to form the curved portion of the main body portion, and cutting the first piece of material to form one or more first extensions and one or more second extensions. The method for manufacturing the sealing strip further includes attaching the first extension and the second extension to either side of the curved portion, respectively, before or after the curved portion is attached to the mask body.

[0023] In one embodiment, the method for manufacturing the sealing strip further includes, before cutting the first piece of material, providing an airtight layer and a fixing layer on the first piece of material so that the sealing strip further comprises an airtight layer fixed to one of the upper and lower surfaces of the main body portion by the fixing layer.

[0024] The airtight layer is formed on the first piece of material by one of attaching an incompletely cured airtight film to one side of the first piece of material and curing it to form the airtight layer integrally with the first piece of material, and spraying a fixing layer material onto one side of the first piece of material and / or one side of the airtight member and joining the airtight member to the first piece of material with the fixing layer material, wherein the fixing layer material is cured to form the fixing layer and the airtight member is fixed to the first piece of material by the fixing layer to form the airtight layer.

[0025] Another aspect of the present invention is to provide a sealing strip, the sealing strip being manufactured by using the method for manufacturing a sealing strip according to the present invention.

[0026] Another aspect of the present invention is to provide a respiratory mask comprising a respiratory mask body and further comprising a sealing strip manufactured by using a method for manufacturing a sealing strip according to the present invention.

[0027] The present invention provides improved sealing strips, respirators, and methods for manufacturing sealing strips that can simplify the manufacturing of sealing strips, improve the manufacturing quality of sealing strips, achieve maximum material utilization, improve the seal between the respirator and the wearer's face, and improve the comfort of wearing the respirator. [Brief explanation of the drawings]

[0028] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which like features or components are represented by like reference numerals and in which the drawings are not necessarily drawn to scale. [Figure 1] 1 is a perspective view of a sealing strip according to a first embodiment of the present invention; [Figure 2] 2 is a schematic diagram showing cutting of the sealing strip of FIG. 1; FIG. [Figure 3] FIG. 2 is a top view of the sealing strip of FIG. 1. [Figure 4] FIG. 2 is a front view of the sealing strip of FIG. 1. [Figure 5] FIG. 1 is a side view of a first respiratory mask with a sealing strip according to a first embodiment of the present invention. [Figure 6] FIG. 6 is a perspective view of the first respiratory mask of FIG. 5, showing the sealing strips of the first respiratory mask. [Figure 7]FIG. 1 is a front view of a second respiratory mask with a sealing strip according to a first embodiment of the present invention. [Figure 8] FIG. 8 is a perspective view of the second respiratory mask of FIG. 7, showing the sealing strips of the second respiratory mask. [Figure 9] FIG. 4 is a perspective view of a sealing strip according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a top view of the sealing strip of FIG. 9. [Figure 11] FIG. 10 is a front view of the sealing strip of FIG. 9. [Figure 12] FIG. 10 is a schematic diagram of a third respiratory mask with a sealing strip according to a second embodiment of the present invention. [Figure 13] 13 is another schematic view of the third respiratory mask of FIG. 12, showing the sealing strips of the third respiratory mask. [Figure 14] FIG. 10 is a schematic diagram of a fourth respiratory mask with a sealing strip according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following description is merely exemplary in nature and is not intended to limit the invention, its application, and uses. It should be understood that like reference numerals represent the same or similar parts and features throughout the accompanying drawings. The accompanying drawings illustratively illustrate the concepts and principles of embodiments of the present invention, but do not necessarily depict the specific size and scale of each embodiment of the present invention. In some portions of certain accompanying drawings, relevant details or structures of embodiments of the present invention may be exaggerated.

[0030] In the description of the embodiments of the present invention, related directional terms such as "upper", "lower", "left" and "right" are used to describe the upper, lower, left and right positions of the figures shown in the accompanying drawings. In practical applications, the positional relationships of "upper", "lower", "left" and "right" used herein may be defined according to the actual situation, and these relationships may be reversed.

[0031] FIG. 1 is a perspective view of a sealing strip 10 according to a first embodiment of the present invention. As shown in FIG. 1, the sealing strip 10 has an integral structure including a flexible main body portion 11 and an airtight layer 12. The main body portion 11 is made of a flexible porous material, such as a foam. The foam may be, for example, polyurethane, polyvinyl chloride, polypropylene, polyethylene, polyethylene vinyl acetate, rubber, or a combination thereof. The airtight layer 12 is provided on the upper or lower surface of the main body portion 11 in the height direction (the direction indicated by the double arrow B in FIG. 1). In FIG. 1, the airtight layer 12 is provided on the upper surface of the main body portion 11. The airtight layer 12 is formed on the main body portion 11 before the sealing strip 10 is cut and formed. For example, before the sealing strip 10 is formed, the airtight layer may be formed on one side of the foam used to manufacture the main body portion 11 of the sealing strip 10, and the airtight layer may be formed integrally with the foam. The thickness of the airtight layer formed on the foam (the size of the main body portion 11 in the height direction) may be set according to the application requirements of the sealing strip 10. The airtight layer and fixing layer may be provided on a piece of material (e.g., foam) used to manufacture the main body 11 such that the airtight layer is fixed to the piece of material used to manufacture the main body 11 by the fixing layer. The material of the fixing layer may be the same as or different from the material of the airtight layer. For example, an airtight film that is not fully cured may be attached to one side of the foam and cured to form the airtight layer and fixing layer integrally with the foam. The airtight film may be, for example, a polyurethane film. Alternatively, a fixing layer material may be sprayed onto one side of the airtight member and / or foam such that the airtight member is fitted to the foam by the fixing layer material. The fixing layer material is cured to form the fixing layer, and the airtight member is fixed to the foam by the fixing layer to form the airtight layer.

[0032] The sealing strip 10 has a first side surface 13 extending in the longitudinal direction of the sealing strip 10 (the direction indicated by the double arrow A in FIG. 1 ) and a second side surface 14 opposite the first side surface 13. The direction indicated by the double arrow D in FIG. 1 is the thickness direction of the sealing strip 10, and the distance between the first side surface 13 and the second side surface 14 is the thickness of the sealing strip 10. The main body portion 11 of the sealing strip 10 is formed as a curved portion, and preferably, the main body portion 11 is formed integrally as a curved portion including a first protrusion 131 and a second protrusion 133. The first protrusion 131 and the second protrusion 133 are connected to each other in the longitudinal direction of the sealing strip 10 and define a recess 132 located between the first protrusion 131 and the second protrusion 133. The first protrusion 131 and the second protrusion 132 are symmetrical with respect to each other with respect to the recess 132, and the thinnest portion of the main body 11 at the recess 132 is located at the longitudinal midpoint of the main body 11. The first side of the curved portion (i.e., the first side 13 of the sealing strip 10) is a curved surface having a sinusoidal contour with a constant amplitude in the longitudinal direction of the sealing strip 10. The second side of the curved portion (i.e., the second side 14 of the sealing strip 10) is a substantially flat surface to facilitate attachment of the sealing strip 10 to a target product. The target product may be, for example, a respiratory mask. The sealing strip 10 may be used as a nose strip for various respiratory masks, and the respiratory mask may be, for example, a mask. When the sealing strip 10 is attached to a respiratory mask, the second side 14 is attached to the respiratory mask body of the respiratory mask, the first side 13 faces the wearer, the airtight layer 12 is located on the upper side, and the recess 132 is configured to accommodate the wearer's nose. For example, adhesive may be sprayed or applied to the location on the respiratory mask body where the sealing strip 10 will be placed and / or to the second side 14 of the sealing strip 10 to attach the second side 14 of the sealing strip 10 to the respiratory mask body.

[0033] By configuring the sealing strip 10 to have the above-described contour, the sealing strip 10 can be ergonomically fitted to the wearer's nose while achieving maximum utilization of the material used to manufacture the sealing strip 10. FIG. 2 is a schematic diagram illustrating the preparation of the sealing strip 10 using a first material piece M. For example, the first material piece M may be a foam. As shown in FIG. 2, after an airtight layer S is formed on one side of the first material piece M, the first material piece M with the airtight layer S is cut along a first cutting line L1, a second cutting line L2, and a third cutting line L3 in a direction substantially perpendicular to the airtight layer S (i.e., a direction perpendicular to the paper surface in FIG. 2). The first cutting line L1 and the third cutting line L3 are straight lines substantially parallel to each other. The second cutting line L2 is located between the first cutting line L1 and the third cutting line L3 and is a sinusoidal curve. The sinusoidal curve has the same amplitude and period as the sinusoidal profile of the first side 13 of the sealing strip 10 in the longitudinal direction of the sealing strip. The first piece of material M is cut along the first cutting line L1, the second cutting line L2, and the third cutting line L3 to obtain first strips M1 and second strips M2 that join together along the second cutting line L2. The first strip M1 and the second strip M2 each have complementary shapes and include a plurality of curved surface sections connected to each other in the extension direction of the first cutting line L1, the second cutting line L2, and the third cutting line L3. Each curved surface section has the same profile as the sealing strip 10. As shown in FIG. 2, the first strip M1 includes a first curved section M11, a second curved section M12, a third curved section M13, and a fourth curved section M14, and the second strip M2 includes a first curved section M21, a second curved section M22, a third curved section M23, and a fourth curved section M24. The first curved section M11 and the fourth curved section M14 of the first strip M1 are not fully illustrated, and the first curved section M21 and the fourth curved section M24 of the second strip M2 are not fully illustrated. Next, the curved sections are cut out from the first strip M1 and the second strip M2 to obtain a plurality of sealing strips 10.It should be noted that the order of the above cutting steps is not essential, and in other examples of the manufacturing method of the sealing strip according to the present invention, the above cutting steps may be interchanged or performed simultaneously. In the above preferred example, the second cutting line L2 is a continuous sinusoidal curve having the same amplitude and period as the sinusoidal profile of the first side surface 13 of the sealing strip 10 in the longitudinal direction of the sealing strip. Alternatively, the second cutting line L2 may be a curve in which sinusoidal sections alternate with other line sections. That is, a part of the second cutting line L2 is a sinusoidal section whose amplitude and period are the same as the amplitude and axis of the sinusoidal profile of the first side surface 13 of the sealing strip 10, and the remaining part of the second cutting line L2 is another line section, such as a straight line or another curve, alternating with the sinusoidal sections.

[0034] In the above example, the cutting process of the sealing strip is described by taking only the cutting of the first strip M1 and the second strip M2 as an example. However, during the actual cutting process of the sealing strip, the first material piece may be simultaneously cut along multiple cutting lines to simultaneously cut out multiple strips. For example, one or more sets of fourth cutting lines (not shown) and fifth cutting lines (not shown) may be alternately arranged on the other side of the first cutting line L1, and one or more sets of sixth cutting lines (not shown) and seventh cutting lines (not shown) may be alternately arranged on the other side of the third cutting line L3. The fourth and sixth cutting lines may be the same as the second cutting line L2, and the fifth and seventh cutting lines may be the same as the first cutting line L1 or the third cutting line L3. The first material piece may be simultaneously cut along all cutting lines to simultaneously cut out multiple strips.

[0035] 3 and 4 show preferred size parameters of the sealing strip 10. FIG. 3 is a top view of the sealing strip 10 of FIG. 1, and FIG. 4 is a side view of the sealing strip 10 seen from the side where the first side surface 13 is located. Preferably, the length A1 of the sealing strip 10 may be set in the range of 90 mm to 130 mm, and the minimum thickness D1 of the curved portion of the sealing strip 10 at the recess 132 (i.e., the minimum distance between the first side surface 13 and the second side surface 14) may be set in the range of 1 mm to 6 mm. More preferably, the minimum thickness D1 may be set in the range of 2 mm to 5 mm. Particularly preferably, the minimum thickness D1 of the curved portion of the sealing strip 10 at the recess 132 is equal to the minimum thickness D2 of the curved portion of the sealing strip 10 at both longitudinal ends. Preferably, the maximum distance C1 by which the first protrusion 131 and the second protrusion 133 protrude from the minimum thickness position of the recess 132 is set to 4 mm to 10 mm. Preferably, the height H1 of the sealing strip 10 (i.e., the distance between the upper and lower surfaces of the sealing strip 10) is set in the range of 6 mm to 14 mm. In a preferred example, the length A1 of the sealing strip 10 is 110 mm, the minimum thickness D1 is 3 mm, the distance C1 is 6 mm, the height H1 is 10 mm, and the height of the airtight layer 12 (the size in the direction indicated by arrow B in FIG. 1, i.e., the size in the same direction as the height H1) is 10 μm to 100 μm.

[0036] Because the sealing strip 10 has the sinusoidal profile described above, the first strip M1 and the second strip M2 have complementary shapes. In particular, when the minimum thickness D1 of the curved portion of the sealing strip 10 at the recess 132 is equal to the minimum thickness D2 of the curved portion of the sealing strip 10 at both longitudinal ends, the first material piece M can be used to the maximum extent to prepare the sealing strip 10, thereby achieving maximum material utilization. In addition, because the airtight layer 12 of the sealing strip 10 is formed on one side of the first material piece M before the first material piece M is cut, there is no need to separately provide the airtight layer 12 when preparing each sealing strip 10. This simplifies the manufacturing of the sealing strip 10 and prevents misalignment of the airtight layer 12 of the sealing strip 10 due to displacement of the airtight layer when the first material piece M is cut, thereby helping to ensure accurate positioning of the airtight layer 12 of the sealing strip 10.

[0037] Additionally, providing the airtight layer 12 allows for free selection of materials for preparing the sealing strip 10. For example, when generating a 25% dent, foams having a target pressure in the range of 40 N to 500 N, preferably 60 N to 400 N, and more preferably 80 N to 350 N may be used to prepare the sealing strip 10. Table 1 below lists different types of foam samples with different parameters that can be used to prepare the sealing strip 10. By forming an airtight layer on Samples 1 to 5 listed in Table 1, all of the samples can be used to prepare the sealing strip 10 according to the present invention, and all of the above-described beneficial aspects of the sealing strip 10 can be achieved. Note that the foam samples listed in Table 1 are merely examples, and other types of foams other than the samples listed in Table 1 may also be used to prepare the sealing strip 10.

[0038] [Table 1]

[0039] The design of the above structure, profile and size parameters of the sealing strip 10 can simplify the preparation of the sealing strip 10, ensure the manufacturing quality of the sealing strip 10, and achieve maximum material utilization. In addition, the constraints on the main materials used to manufacture the sealing strip 10 can be reduced, thereby increasing the freedom in material selection.

[0040] The sealing strip 10 according to the first embodiment of the present invention may be used as a nose strip for a respirator and may be applied to a variety of respirators, for example, various ear strap respirators, head worn respirators, etc.

[0041] FIG. 5 is a side view of a first respiratory mask 100 with a sealing strip 10, showing the exterior of the first respiratory mask 100. FIG. 6 is a perspective view of the first respiratory mask 100, showing the side facing the wearer (i.e., the interior) of the first respiratory mask 100. As shown in FIGS. 5 and 6, the first respiratory mask 100 is an ear-strap type respirator. In the example shown in the drawings, the first respiratory mask 100 is a foldable ear-strap type respirator. However, the present invention is not limited thereto, and in other examples, the sealing strip 10 may be applied to a non-foldable ear-strap type respirator or other respirator. During the manufacturing process of the first respiratory mask 100, the sealing strip 10 according to the first embodiment of the present invention is attached to the interior of the respiratory mask body 50 of the first respiratory mask 100, with the airtight layer 12 located on the upper side. When the first respirator 100 is worn, the first and second hanging straps T11 and T12 of the first respirator 100 are placed around the wearer's left and right ears, respectively. The first respirator 100 is adjusted so that the wearer's nose is accommodated in the recess 132 of the sealing strip 10, and the first side 13 of the sealing strip 10 can conform to the contours of the wearer's face to fit snugly around the wearer's nose, thereby reducing or even eliminating any gap between the respirator and the wearer's nose. The provision of the airtight layer 12 significantly improves the sealing performance between the first respirator 100 and the wearer's nose. Therefore, a good seal between the first respirator 100 and the wearer's face can be achieved without generating excessive pressure between the first respirator 100 and the wearer's face. Furthermore, the material of the first sealing strip 10 is often softer than the material of the respirator body 50 of the first respirator 100. Therefore, during the process of adjusting the first respiratory mask 100 to fit the contours of the wearer's face, the sealing strip 10 can undergo large deformation. On the one hand, the first respiratory mask 100 can be adapted to wearers with different facial contours. On the other hand, the deformation of the sealing strip 10 can ease the force acting on the wearer's face, thereby reducing discomfort to the wearer.In addition, since a sealing strip 10 having an airtight layer 12 is provided inside the first respiratory mask 100, the wearer's exhaled air is not discharged upward between the first respiratory mask 100 and the wearer's nose, completely mitigating or even avoiding the situation where the wearer's glasses fog up.

[0042] FIG. 7 is a front view of a second respiratory mask 200 equipped with a sealing strip 10, showing the exterior of the second respiratory mask 200. FIG. 8 is a perspective view of the second respiratory mask 200, showing the side facing the wearer (i.e., the interior) of the second respiratory mask 200. As shown in FIGS. 7 and 8, the second respiratory mask 200 is a head-mounted respirator. In the illustrated example, the second respiratory mask 200 is a non-foldable cup-shaped head-mounted respirator. However, the present invention is not limited thereto, and the sealing strip 10 may be applied to a foldable head-mounted respirator or other respirator. In the process of manufacturing the second respiratory mask 200, the sealing strip 10 according to the first embodiment of the present invention is attached to the interior of the respiratory mask body 60 of the second respiratory mask 200, with the airtight layer 12 located on the upper side. When the second respiratory mask 200 is worn, the wearer's head passes through the first sling T21 and the second sling T22 of the second respiratory mask 200, respectively, so that the first sling T21 and the second sling T22 are hung around the wearer's head or neck. The second respiratory mask 200 is adjusted so that the wearer's nose is accommodated in the recess 132 of the sealing strip 10, and the first side 13 of the sealing strip 10 can conform to the contours around the wearer's nose to fit snugly around the nose, thereby achieving a good seal between the second respiratory mask 200 and the wearer's nose. The second respiratory mask 200 with the sealing strip 10 can achieve the same beneficial effects as the first respiratory mask 100 described above.

[0043] The sealing strip 10 according to a first embodiment of the present invention, its manufacturing method, and various respiratory masks equipped with the sealing strip 10 have been described above. The sealing strip 10 according to the first embodiment of the present invention has a sinusoidal profile with a constant amplitude and includes an airtight layer 12, which simplifies the manufacturing of the sealing strip, satisfies sufficient material usage, and provides greater freedom in material selection for the sealing strip. Furthermore, a respiratory mask equipped with the sealing strip 10 can improve the sealing performance between the respiratory mask and the wearer's face without requiring a large force to be applied to the wearer's face, thereby avoiding discomfort to the wearer and improving the comfort of wearing the respiratory mask.

[0044] A sealing strip 20 according to a second embodiment of the present invention will be described below with reference to the accompanying drawings. The sealing strip 20 according to the second embodiment of the present invention is substantially the same as the sealing strip 10 according to the first embodiment of the present invention in terms of material and preparation method, and differs only in the overall contour shape and overall size of the sealing strip 20. In the accompanying drawings and below, parts that are the same as those in the sealing strip 10 are given the same or similar reference numerals, and descriptions thereof will be omitted. Only the differences between the sealing strip 20 and the sealing strip 10 will be described below.

[0045] Figure 9 is a perspective view of a sealing strip 20 according to a second embodiment of the present invention. Figure 10 is a top view of the sealing strip 20. Figure 11 is a side view of the sealing strip 20. It should be noted that these accompanying drawings are not drawn to scale and are merely schematic.

[0046] The sealing strip 20 includes a main body portion 21 and an airtight layer 22 integrally formed in the height direction of the sealing strip 20, and the airtight layer 22 is provided on the upper or lower surface of the main body portion 21 in the height direction. In FIG. 9, the airtight layer 22 is provided on the upper surface of the main body portion 21. The main body portion 21 and the airtight layer 22 of the sealing strip 20 may be made of the same material as the main body portion 11 and the airtight layer 12 of the sealing strip 10. For example, the sealing strip 20 may be made by cutting a first material piece M having the airtight layer S shown in FIG. 2 along the contour of the sealing strip 20, where the portion of the first material piece M not having the airtight layer S constitutes the main body portion 21 of the sealing strip 20, and the airtight layer S provided on the first material piece M constitutes the airtight layer 22 of the sealing strip 20.

[0047] The main body portion 21 of the sealing strip 20 has a first side surface 23 extending in the longitudinal direction of the sealing strip 20 (the direction indicated by the double arrow A in FIG. 9 ) and a second side surface 24 opposite to the first side surface 23. The first side surface 23 is a curved surface extending in the longitudinal direction of the sealing strip 20, and the second side surface 24 is a substantially flat surface. The main body portion 21 has a curved surface portion 25, which includes a first protrusion 251 and a second protrusion 253 formed integrally therewith. The first protrusion 251 and the second protrusion 253 are connected to each other in the longitudinal direction of the sealing strip 20 and define a recess 252 located between the first protrusion 251 and the second protrusion 253. The first protrusion 251 and the second protrusion 253 are symmetrical with respect to the recess 252, the minimum thickness portion of the curved surface portion 25 in the recess 232 is located at the middle position in the longitudinal direction of the curved surface portion 25, and the first side surface of the curved surface portion 25 (i.e., the portion of the first side surface 23 of the curved surface portion 25) is a curved surface having a sinusoidal contour with a constant amplitude in the longitudinal direction of the sealing strip 20. Preferably, the length A22 of the curved surface portion 25 may be set in the range of 90 mm to 130 mm. Preferably, the minimum thickness D3 of the curved surface portion 25 in the recess 232 (the minimum distance between the first side surface 23 and the second side surface 24 of the curved surface portion 25) may be set in the range of 1 mm to 6 mm. More preferably, the minimum thickness D1 may be set in the range of 2 mm to 5 mm. Particularly preferably, the minimum thickness D3 of the curved surface portion 25 in the recess 232 is equal to the minimum thickness D4 of the curved surface portion 25 at both ends in the longitudinal direction. Preferably, the maximum distance C2 by which the first protrusion 251 and the second protrusion 252 protrude from the minimum thickness position of the recess 252 is set in the range of 4 mm to 10 mm. Preferably, the height H2 of the curved surface portion 25 (i.e., the distance between the upper surface and the lower surface of the curved surface portion 25 in the direction indicated by arrow B in FIG. 9) is in the range of 6 mm to 14 mm. The curved surface portion 25 of the sealing strip 20 may have the same structure as the sealing strip 10. That is, the first protrusion 251, the recess 252, and the second protrusion 253 of the curved surface portion 25 may have the same contours and sizes as the first protrusion 131, the recess 132, and the second protrusion 133 of the sealing strip 10 according to the first embodiment of the present invention.

[0048] 9 and 10, the sealing strip 20 further includes a first extension 26 and a second extension 27 located on both sides of the curved surface portion 25 in the longitudinal direction of the sealing strip 20. The first extension 26 extends from the first convex portion 251 of the curved surface portion 25 to a first end of the sealing strip 20 (the left end in FIGS. 9 and 10), and the second extension 27 extends from the second convex portion 253 to a second end of the sealing strip 20 (the right end in FIGS. 9 and 10). In the example shown in FIGS. 9 to 11, the height of the first extension 26 and the second extension 27 between the upper surface and the lower surface is the same as the height of the curved surface portion 25, and both the first extension 26 and the second extension 27 have a constant thickness, which is the same as the minimum thickness D3 of the curved surface portion 25 at the recess 232. However, the present invention is not limited thereto. In other examples according to the present invention, the heights of the first extension 26 and the second extension 27 may be different from the height of the curved portion 25, and the first extension 26 and / or the second extension 27 may have variable thicknesses. In the examples shown in FIGS. 9 to 11, the first extension 26, the curved portion 25, and the second extension 27 are cut out integrally, and the length A21 of the first extension 26 is the same as the length A23 of the second extension 27. However, the present invention is not limited thereto. In other examples according to the present invention, the length A21 of the first extension 26 and the length A23 of the second extension 27 may be different, and / or the first extension 26, the curved portion 25, and the second extension 27 may be cut out separately and connected to each other.

[0049] In an example where the first extension portion 26, the curved surface portion 25, and the second extension portion 27 are cut out separately, for example, in the case of a first piece of material M having an airtight layer S as shown in Fig. 2, the first piece of material M may be cut along a first cutting line L1, a second cutting line L2, and a third cutting line L3 shown in Fig. 2 to obtain a first strip M1 and a second strip M2, and various curved surface sections are cut out from the first strip M1 and the second strip M2 to obtain a plurality of curved surface portions 25. In addition, one or more first extension portions 26 and one or more second extension portions 27 are cut out from the first piece of material M. For example, the first piece of material M is cut along two straight cutting lines (not shown) according to the thicknesses of the first extension 26 and the second extension 27 to form a third strip (not shown), and the third strip is cut into a plurality of sections according to the length A21 of the first extension 26 and the length A23 of the second extension 27 corresponding to the first extension 26 and the second extension 27, respectively, thereby obtaining a plurality of first extensions 26 and a plurality of second extensions 27. Then, before or after the sealing strip 20 is attached to the respiratory mask, the first extension 26, the curved portion 25, and the second extension 27 obtained by cutting are connected to each other to form the sealing strip 20. In this example, in which the first extension 26, the curved portion 25 and the second extension 27 are cut out separately, the first strip M1 and the second strip M2 obtained by cutting have complementary shapes, and the third strip may be cut into a rectangular strip of regular shape in the longitudinal or width direction of the first piece of material M, thereby reducing the waste material generated in the cutting process and therefore achieving maximum utilization of the first piece of material M.

[0050] In this example, since the curved portion 25 of the sealing strip 20 has the same contour and size as the sealing strip 10, the curved portion 25 of the sealing strip 20 may be formed using the method for forming the sealing strip 10. However, the present invention is not limited thereto. Even if the amplitude and / or period of the curved contour of the curved portion 25 of the sealing strip 20 is different from those of the sealing strip 10, the curved portion 25 can still be formed using the same method as above, as long as the curve (e.g., the amplitude and period of the sine curve) of the second cutting line L2 in FIG. 2 is configured in the same way as the contour of the curved portion 25 of the sealing strip 20 in the longitudinal direction of the sealing strip.

[0051] The sealing strip 20 according to the second embodiment can achieve the same beneficial effects as the sealing strip 10 according to the first embodiment of the present invention.

[0052] Additionally, compared to the sealing strip 10, the sealing strip 20 also includes a first extension 26 and a second extension 27 located on either side of the curved portion 25. The sealing strip 20 according to the second embodiment of the present invention may be used as a face sealing strip for various respiratory masks and may be configured to cover at least a portion of the peripheral edge of the respiratory mask that contacts the wearer's face. When the sealing strip 20 is attached to the respiratory mask, the first side 23 faces the wearer's face, and the second side 24 is attached to the respiratory mask body of the respiratory mask. Compared to the sealing strip 10, the sealing strip 20 can cover a wider area of ​​the peripheral edge of the respiratory mask, thereby providing a wider seal between the respiratory mask and the wearer's face and improving wearing comfort.

[0053] 12 and 13 show a third respiratory mask 300 equipped with a sealing strip 20 according to a second embodiment of the present invention, showing the outside and inside of the third respiratory mask 300, respectively. The third respiratory mask 300 shown in FIGS. 12 and 13 is an ear strap type respiratory mask. However, the present invention is not limited thereto, and the sealing strip 20 according to the second embodiment of the present invention may also be applied to a head-mounted type respiratory mask. As shown in FIG. 13, the sealing strip 20 is provided on the inside of the respiratory mask body 70 of the third respiratory mask 300 so as to cover the entire peripheral portion of the third respiratory mask 300 that comes into contact with the wearer's face, and the airtight layer 22 is provided on the outer periphery thereof, i.e., toward the upper side in the nose region and toward the outer side in the cheek region. When the third respiratory mask 300 is worn, the first hanging strap T31 and the second hanging strap T32 are hung around the wearer's left and right ears, respectively, and the third respiratory mask 300 is adjusted so that the curved portion 25 of the sealing strip 20 fits the contour around the wearer's nose, and the first extension portion 26 and the second extension portion 27 fit the contours of the wearer's left and right cheeks, respectively. Because the sealing strip 20 is provided with the airtight layer 22, the peripheral portion of the third respiratory mask 300 can fit snugly against the wearer's face without applying significant pressure to the wearer's face, thereby reducing discomfort when worn and even preventing obvious dents or injuries on the wearer's face, and greatly improving wearing comfort.

[0054] Figure 14 shows a fourth respiratory mask 400 with a sealing strip 20 according to a second embodiment of the present invention. The fourth respiratory mask 400 is substantially the same as the third respiratory mask 300, except that the sealing strip 20 covers only a portion of the periphery of the fourth respiratory mask 400 that contacts the wearer's face, as shown in Figure 14. The fourth respiratory mask 400 can provide substantially the same beneficial effects as the third respiratory mask 300 described above.

[0055] The sealing strip according to preferred embodiments of the present invention, various respiratory masks including the sealing strip according to the present invention, and a method for manufacturing the sealing strip have been described above with reference to the accompanying drawings. The sealing strip, respiratory masks including the sealing strip, and a method for manufacturing the sealing strip according to the present invention can simplify the manufacturing of the sealing strip, improve material utilization, improve the sealing performance between the respiratory mask and the wearer's face, reduce or avoid the formation of dents or injuries on the wearer's face, and improve the comfort of wearing the respiratory mask.

[0056] In the above example, the second cutting line L2 is a sinusoidal curve with a constant amplitude, and the multiple curved sections of the first strip M1 and the second strip M2 obtained by cutting the first material piece M have the same contour. However, the present invention is not limited to this. In other embodiments according to the present invention, the second cutting line L2 may be configured to be a sinusoidal curve with a variable amplitude, and the first strip M1 and the second strip M2 obtained by cutting the first material piece M1 may each include multiple curved sections with different contours. The multiple curved sections with different contours may be used as curved portions of sealing strips of different sizes. Therefore, various types of curved portions of sealing strips can be cut out with a single cut, while still achieving maximum material utilization.

[0057] In the above embodiment, the application of the sealing strip according to the present invention to a respiratory mask is illustrated by using a respiratory mask as the target product, however, it should be understood that the sealing strip according to the present invention may also be applied to target products other than respiratory masks.

[0058] Although the preferred embodiments of the present invention have been described in detail above, it should be understood that the present invention is not limited to the specific embodiments described in detail above. Those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention. All of these modifications and changes are included within the scope of the present invention. Furthermore, all of the components described herein can be replaced by other technically equivalent components. In the following, exemplary embodiments are presented. [Item 1] a body portion having an upper surface, a lower surface, a first side surface, and a second side surface opposite the first side surface; the second side is attached to a respiratory mask body of the respiratory mask such that the first side faces a wearer, and the sealing strip covers at least a portion of a periphery of the respiratory mask body that is to contact the wearer's face; 1. A sealing strip for a respiratory mask, wherein the main body portion includes a curved portion, the curved portion including a first convex portion and a second convex portion, the first convex portion and the second convex portion being connected to each other in a longitudinal direction of the sealing strip to define a recess located between the first convex portion and the second convex portion, the recess being configured to accommodate the nose of the wearer, the first convex portion and the second convex portion being symmetrical with respect to the recess, and a first side of the curved portion being a constant amplitude sinusoidal curve extending in the longitudinal direction of the sealing strip. [Item 2] Item 1. The sealing strip for a respiratory mask according to item 1, wherein the distance between the first side and the second side of the curved portion is the thickness of the curved portion, and the minimum thickness of the curved portion at both longitudinal ends of the sealing strip is equal to the minimum thickness of the curved portion at the recess. [Item 3] the main body portion further includes a first extension portion and a second extension portion located on both sides of the curved portion in the longitudinal direction of the sealing strip, the first extension portion extending from the first convex portion to a first end of the sealing strip, and the second extension portion extending from the second convex portion to a second end of the sealing strip; Item 2. The sealing strip for a respiratory mask according to item 1, wherein the distance between the first side and the second side of the first extension and / or the second extension is constant or variable. [Item 4] Item 4. The sealing strip for a respiratory mask according to item 3, wherein the first extension and the second extension have the same contour. [Item 5] the first extension, the curved surface, and the second extension are integrally formed; or 4. The sealing strip for a respiratory mask according to item 3, wherein the first extension portion, the curved portion, and the second extension portion are formed separately and attached to each other. [Item 6] the distance between the upper and lower surfaces of the curved portion is between 6 mm and 14 mm; and / or the length of the curved portion in the longitudinal direction of the sealing strip is between 90 mm and 130 mm; and / or In the recess, the minimum distance between the first side surface and the second side surface of the curved surface portion is 1 mm to 6 mm; and / or 6. The sealing strip for a respiratory mask according to any one of items 1 to 5, wherein the maximum distance between the first side surface and the second side surface of the first convex portion and the second convex portion is 4 mm to 10 mm larger than the minimum distance between the first side surface and the second side surface of the curved portion. [Item 7] 6. The sealing strip for a respiratory mask according to any one of items 1 to 5, wherein the sealing strip further comprises an airtight layer and a fixing layer, the airtight layer being fixed to one of the upper surface and the lower surface of the main body by the fixing layer, and the airtight layer of the sealing strip being located on an outer circumferential side when the sealing strip is attached to the respiratory mask. [Item 8] A respiratory mask comprising a respiratory mask body, further comprising a sealing strip for a respiratory mask according to any one of items 1 to 7, wherein the sealing strip is attached to the respiratory mask body so as to cover at least a portion of a peripheral edge of the respiratory mask body that is to come into contact with a wearer's face. [Item 9] 1. A method for manufacturing a sealing strip, comprising: Providing a first piece of material; cutting the first piece of material to prepare a body portion of the sealing strip having an upper surface, a lower surface, a first side, and a second side opposite the first side, wherein the second side is attached to a respiratory mask body of the respiratory mask with the first side facing a wearer, and the sealing strip covers at least a portion of a periphery of the respiratory mask body that is to contact the wearer's face; A method for manufacturing a sealing strip, wherein the main body portion is cut to have a curved portion, the curved portion including a first convex portion and a second convex portion, the first convex portion and the second convex portion being connected to each other in the longitudinal direction of the sealing strip to define a recess located between the first convex portion and the second convex portion, the recess being configured to accommodate the wearer's nose, the first convex portion and the second convex portion being symmetrical with respect to the recess, and the first side of the curved portion being a constant amplitude sinusoidal curve extending in the longitudinal direction of the sealing strip. [Item 10] the step of cutting the first piece of material includes the steps of cutting the first piece of material along a first cutting line, a second cutting line, and a third cutting line, respectively, to form a first strip and a second strip that mate with each other along the second cutting line; The first cutting line and the third cutting line are straight lines parallel to each other, the second cutting line is located between the first cutting line and the third cutting line, the second cutting line includes one or more sinusoidal sections, and the first strip and the second strip each include at least one curved section having the same contour as the curved surface portion; 10. The method for manufacturing a sealing strip of claim 9, wherein the step of cutting the first piece of material further comprises cutting the first strip and the second strip to form the sealing strip including the curved portion. [Item 11] Item 11. The method for manufacturing a sealing strip according to item 10, wherein the distance between the first side surface and the second side surface of the curved portion is the thickness of the curved portion, and the minimum thickness of the curved portion at both ends of the sealing strip in the longitudinal direction is equal to the minimum thickness of the curved portion at the recess. [Item 12] Item 11. The method for manufacturing a sealing strip according to item 10, wherein the period of the one or more sinusoidal sections is constant. [Item 13] Item 11. The method for manufacturing a sealing strip according to item 10, wherein the second cutting line further comprises other line sections alternating with the sinusoidal sections. [Item 14] the body portion further includes a first extension portion and a second extension portion located on either side of the curved portion in the longitudinal direction of the sealing strip, and the step of cutting the first piece of material includes: Item 14. The method for manufacturing a sealing strip according to item 13, further comprising a step of cutting out the main body portion from the first strip and the second strip, respectively, so that the first extension portion, the curved surface portion, and the second extension portion are integrally formed. [Item 15] the body portion further includes a first extension portion and a second extension portion located on either side of the curved portion in the longitudinal direction of the sealing strip, and the step of cutting the first piece of material includes: cutting the curved sections from the first strip and the second strip to form the curved surface portion of the main body; cutting the first piece of material to form one or more first extensions and one or more second extensions; Item 11. The method for manufacturing the sealing strip according to item 10, further comprising the step of attaching the first extension portion and the second extension portion to both sides of the curved portion, respectively, before or after the curved portion is attached to the mask body. [Item 16] 16. The method for manufacturing a sealing strip according to any one of items 9 to 15, further comprising, before cutting the first piece of material, providing the first piece of material with an airtight layer and a fixing layer such that the sealing strip further comprises an airtight layer fixed to one of the upper surface and the lower surface of the body portion by a fixing layer. [Item 17] The airtight layer is attaching an incompletely cured airtight film to one side of the first piece of material and curing the airtight film to form the airtight layer and the fixing layer integrally with the first piece of material; a fixing layer material being sprayed onto one side of the first material piece and / or one side of the airtight member, and the airtight member being fitted to the first material piece by the fixing layer material, wherein the fixing layer material is hardened to form the fixing layer, and the airtight member is fixed to the first material piece by the fixing layer to form the airtight layer, Item 17. A method for manufacturing a sealing strip according to item 16, wherein the first piece of material is formed. [Item 18] A sealing strip manufactured using the method for manufacturing a sealing strip according to any one of items 9 to 17. [Item 19] 19. A respiratory mask comprising a respiratory mask body and further comprising a sealing strip according to item 18.

Claims

1. 1. A sealing strip for a respiratory mask, comprising: a body portion having an upper surface, a lower surface, a first side surface, and a second side surface opposite the first side surface; the second side is attached to a respiratory mask body of the respiratory mask such that the first side faces a wearer, and the sealing strip covers at least a portion of a periphery of the respiratory mask body that is to contact the wearer's face; 1. A sealing strip for a respiratory mask, wherein the main body portion includes a curved portion, the curved portion including a first convex portion and a second convex portion, the first convex portion and the second convex portion being connected to each other in a longitudinal direction of the sealing strip to define a recess located between the first convex portion and the second convex portion, the recess being configured to accommodate the nose of the wearer, the first convex portion and the second convex portion being symmetrical with respect to the recess, and a first side of the curved portion being a constant amplitude sinusoidal curve extending in the longitudinal direction of the sealing strip.

2. 2. The sealing strip for a respiratory mask of claim 1, wherein the distance between the first side and the second side of the curved portion is the thickness of the curved portion, and the minimum thickness of the curved portion at both longitudinal ends of the sealing strip is equal to the minimum thickness of the curved portion at the recess.

3. 2. The sealing strip for a respiratory mask according to claim 1, wherein the main body portion further includes a first extension portion and a second extension portion located on either side of the curved portion in the longitudinal direction of the sealing strip, the first extension portion extending from the first convex portion to a first end of the sealing strip, and the second extension portion extending from the second convex portion to a second end of the sealing strip.

4. 4. The sealing strip for a respiratory mask of claim 3, wherein the first extension and the second extension have the same contour.

5. the first extension, the curved surface and the second extension are integrally formed; or 4. The sealing strip for a respiratory mask of claim 3, wherein the first extension, the curved portion, and the second extension are formed separately and attached to one another.

6. the distance between the upper and lower surfaces of the curved portion is between 6 mm and 14 mm; and / or the length of the curved portion of the sealing strip in the longitudinal direction is between 90 mm and 130 mm; and / or In the recess, the minimum distance between the first side and the second side of the curved portion is 1 mm to 6 mm; and / or 6. The sealing strip for a respiratory mask according to any one of claims 1 to 5, wherein the maximum distance between the first side and the second side of the first convex portion and the second convex portion is 4 mm to 10 mm greater than the minimum distance between the first side and the second side of the curved portion.

7. 1. A method of making a sealing strip for a respiratory mask, comprising: Providing a first piece of material; cutting the first piece of material to prepare a body portion of the sealing strip having an upper surface, a lower surface, a first side, and a second side opposite the first side, wherein the second side is attached to a respiratory mask body of the respiratory mask with the first side facing a wearer, and the sealing strip covers at least a portion of a periphery of the respiratory mask body that is to contact the wearer's face; 1. A method for manufacturing a sealing strip for a respiratory mask, wherein the main body portion is cut to have a curved portion, the curved portion including a first convex portion and a second convex portion, the first convex portion and the second convex portion being connected to each other in a longitudinal direction of the sealing strip to define a recess located between the first convex portion and the second convex portion, the recess being configured to accommodate the nose of the wearer, the first convex portion and the second convex portion being symmetrical about the recess, and the first side of the curved portion being a constant amplitude sinusoidal curve extending in the longitudinal direction of the sealing strip.

8. the step of cutting the first piece of material includes the steps of cutting the first piece of material along a first cutting line, a second cutting line, and a third cutting line, respectively, to form a first strip and a second strip that mate with each other along the second cutting line; the first cutting line and the third cutting line are straight lines parallel to each other, the second cutting line is located between the first cutting line and the third cutting line, the second cutting line includes one or more sinusoidal sections, and the first strip and the second strip each include at least one curved section having the same contour as the curved surface portion; 8. The method of claim 7, wherein the step of cutting the first piece of material further comprises cutting the first strip and the second strip to form the sealing strip including the curved portion.

9. 9. The method of claim 8, wherein the distance between the first side and the second side of the curved portion is the thickness of the curved portion, and the minimum thickness of the curved portion at both longitudinal ends of the sealing strip is equal to the minimum thickness of the curved portion at the recess.

10. 9. The method of claim 8, wherein the period of the one or more sinusoidal sections is constant.

Images