Lemon-ginger composite essential oil microcapsule anti-pregnancy anti-silk mask and preparation method thereof

Abstract

The invention discloses a lemon-ginger composite essential oil microcapsule anti-pregnancy anti-silk mask and a preparation method thereof.The mask comprises a mask body and ear straps, the mask body is of a three-layer composite 3D structure, and the mask body sequentially comprises an outer slow-release layer, a middle filter layer and an inner skin-friendly layer from outside to inside; the outer slow-release layer is composed of a double-layer real silk fabric subjected to dip dyeing treatment by microcapsule finishing liquid, and lemon-ginger composite essential oil microcapsules are loaded in the microcapsule finishing liquid. The invention relates to the technical field of functional textiles, and particularly provides a lemon-ginger composite essential oil microcapsule anti-pregnancy anti-silk mask and a preparation method thereof.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of functional textile technology, in particular to a lemon-ginger composite essential oil microcapsule anti-pregnancy real silk mask and a preparation method thereof. BACKGROUND

[0002] Nausea and vomiting during pregnancy, commonly known as "pregnancy reversal", is a common physiological reaction in early pregnancy. The olfactory sensitivity of pregnant women is significantly improved, and unpleasant odors in the environment can easily induce or aggravate nausea. Wearing a mask for physical isolation is a direct means.

[0003] However, the existing commercially available masks have obvious technical defects for pregnant women: first, the skin-friendliness of the material is poor. Ordinary medical non-woven fabric and chemical fiber masks have insufficient air permeability, and long-term wearing can easily cause facial heat and sweat accumulation. In addition, some materials contain chemical residues, which can easily cause allergic reactions in sensitive skin during pregnancy and aggravate discomfort. Second, the function is single. Only passive blocking of particulate matter and macromolecular odor can be achieved, and active intervention of nausea caused by olfactory sensitivity cannot be achieved. Third, the fragrance retention period of aromatic masks is short. Existing products mostly use direct spraying and soaking of essential oils. The essential oil components are exposed to the air and easily oxidize and volatilize quickly. Usually, the fragrance is basically dissipated within 24-48 hours, which cannot meet the continuous use demand of more than 3 months in early pregnancy. Fourth, the comfort is insufficient. The planar mask structure has poor fit with the face, and is easy to stick to the nose and mouth during breathing, aggravating the feeling of suffocation, and air leakage is easy to occur from the nasal alae and chin, making it difficult to balance protection and comfort.

[0004] Microcapsule technology is a technology that encapsulates solid, liquid or gas core materials in a small shell, and is widely used in the slow-release functional finishing of textiles. However, there is no report on the use of specific natural plant essential oil compounding system with synergistic anti-emetic effect through microencapsulation technology on high skin-friendly natural protein fibers and application in a three-dimensional mask product for the special physiological needs of pregnant women. SUMMARY

[0005] The present application aims to solve the four problems of skin-friendliness of mask material, structural comfort, long-term functionality and safety during pregnancy and childbirth.

[0006] The present application provides the following technical invention: a lemon-ginger composite essential oil microcapsule anti-pregnancy real silk mask is provided, comprising a mask body and ear straps, the mask body is a three-layer composite 3D structure, from outside to inside, it is: outer slow-release layer, middle filter layer and inner skin-friendly layer; The outer slow-release layer is composed of double-layer real silk fabric treated by microcapsule finishing liquid, and the microcapsule finishing liquid contains lemon-ginger composite essential oil microcapsules.

[0007] Preferred technical solution 1: The core material of the microcapsule is one or more of lemon essential oil, ginger essential oil, and peppermint essential oil, and the wall material is one or more of gelatin, gum arabic, chitosan, sodium alginate, or melamine resin. The average particle size of the microcapsule is 1~20μm.

[0008] Preferred technical solution 2: The middle filter layer is meltblown nonwoven fabric.

[0009] Preferred technical solution three: The inner skin-friendly layer is 100% mulberry silk crepe satin fabric without any functional finishing.

[0010] Preferred technical solution four: The 3D three-dimensional structure design includes an outwardly protruding breathing cavity in the middle of the mask along the bridge of the nose and the contour of the chin, and a memory nose strip built into the bridge of the nose.

[0011] This invention relates to a method for preparing a lemon-ginger compound essential oil microcapsule anti-pregnancy silk mask, specifically including the following steps: S1. Preparation of Lemon-Ginger Composite Essential Oil Microcapsules: A complex coagulation method was used, with gelatin and gum arabic as wall materials, and a mixture of lemon essential oil and ginger essential oil in a 1:1 mass ratio as the core material. After emulsification, coagulation, solidification, washing, and drying, microcapsule powder was obtained; specifically including: Emulsification: Add 100 parts of mixed essential oil to 200 parts of gelatin, and stir for 15 minutes at 8000 r / min in a 50℃ constant temperature water bath to form a stable O / W oil-in-water emulsion, controlling the oil droplet size between 5-10μm. Coagulation: While stirring, slowly add 200 parts of gum arabic and dilute with 400 parts of deionized water; adjust the pH to 4.0-4.2 with 10% acetic acid solution. At this point, the gelatin and gum arabic have opposite charges, and a coagulation reaction occurs, depositing on the surface of the essential oil droplets to form a capsule wall. Curing: Turn on the cooling circulating water to slowly lower the system temperature to below 10℃ to gel the capsule wall; then add the crosslinking agent, adjust the pH to 8.5-9.0, and heat to 40℃ for 3 hours to solidify and harden the capsule wall; Post-processing: The product was filtered and washed multiple times with water to remove residual cross-linking agent, and finally spray-dried to obtain anti-pregnancy essential oil microcapsule powder; S2. Microcapsule impregnation finishing of silk fabric: Prepare a finishing working solution containing the microcapsule powder obtained in step S1, water-based polyurethane adhesive and softener; treat the silk fabric as the outer slow-release layer using a padding-drying-baking process, wherein the baking temperature is 110~130℃ and the time is 1.5~3 minutes. Finishing solution formulation, taking 1L as an example: Anti-pregnancy essential oil microcapsules: 40g, water-based polyurethane adhesive: 25g, silk-specific softener: 10g, deionized water: balance; Specific steps include: Solution preparation: Add the microcapsule powder to water, stir at high speed to disperse evenly, then add binder and softener to prepare a homogeneous finishing solution; Impregnation: The silk fabric is immersed in the working solution using a "two-dip, two-pinch" process. The immersion time is 2 minutes, the padding pressure is 0.3 MPa, and the liquid retention rate (pinch-out rate) is controlled between 75% and 80% to ensure that the finishing solution fully penetrates into the fiber. Pre-drying: The impregnated fabric is fed into a setting machine and pre-dried at 80-90℃ for 3 minutes to remove most of the moisture; Baking: Baking at 110-120℃ for 2 minutes. This step causes the adhesive to undergo a cross-linking reaction, firmly adhering the microcapsules to the surface of the silk fibers and the gaps in the yarn. The fabric is lightly washed to remove surface dye and unbound microcapsules, and after drying, a pregnancy-resistant reverse silk fabric with long-lasting fragrance is obtained. S3. Sewing and forming of the 3D mask: Using the silk fabric treated in step S2 as the outer layer, meltblown nonwoven fabric as the middle layer, and untreated plain crepe silk fabric as the inner layer, cut, fold, and sew according to the 3D pattern, and assemble the malleable nose pad and ear loops, specifically including: Cutting: Use a laser cutting machine to cut the fabric according to the preset 3D pattern. The pattern needs to reserve the curvature of the bridge of the nose and chin to form a breathing chamber with a bulge in the middle. Sewing: Align the outer, middle, and inner layers, sew them together along the central axis, and then bind the edges. Accessory installation: A shaped memory nose strip is implanted in the bridge of the nose to prevent fogging of glasses due to breath, and elastic soft ear loops of adjustable length are sewn on both sides to avoid ear strain and dizziness; Finished product packaging: After ultraviolet sterilization, each piece is individually sealed. Performance test results Performance tests were conducted on the masks prepared according to the above embodiments: Slow-release performance: Under simulated wearing conditions (37℃, 60% humidity), the mask can continuously release a faint lemon and ginger scent.

[0012] Washability: Hand washing test conducted according to GB / T 8629 standard. After 15 washes, the fragrance retention rate remained above 60% after electronic nose test and manual smell test, which can meet the needs of repeated use in the first trimester of pregnancy (about 3 months).

[0013] Safety: Tested by a third-party organization, no formaldehyde was detected, the pH value is weakly acidic (similar to that of the skin), and the skin irritation test result is "non-irritating".

[0014] The lemon-ginger compound essential oil microcapsule anti-pregnancy silk mask and its preparation method proposed in this invention have the following beneficial effects: (1) Possesses long-lasting, stable anti-pregnancy effects and a comfortable experience: This invention encapsulates lemon-ginger compound essential oil in microcapsules and uses a padding-baking process to fix it onto the outer layer of silk, achieving a slow and lasting release of the essential oil components. Under simulated wearing conditions, the mask continuously emits a soothing fragrance, which helps alleviate nausea in early pregnancy. Washing tests show that the fragrance retention rate is still above 60% after 15 washes, which can meet the needs of repeated use in early pregnancy, demonstrating significant long-lasting effectiveness. (2) Achieving excellent skin-friendly breathability and wearing comfort: The inner layer of the mask is made of 100% mulberry silk crepe satin fabric without functional finishing. It is smooth, soft and breathable, which can effectively reduce friction and irritation to sensitive skin. Combined with the 3D three-dimensional structure design and breathing cavity space, it ensures air circulation when wearing, reducing stuffiness and pressure. With the addition of a malleable memory nose strip and adjustable ear loops, it further improves the facial fit and adaptability, avoiding problems such as ear irritation and fogging, and the overall wearing comfort is high. (3) Balancing safety and health protection during pregnancy and postpartum: The entire mask system is made of natural silk, non-irritating finishing agents, and plant-derived essential oils. Tests showed that no formaldehyde was detected in the finished product, the pH value was weakly acidic, similar to that of the skin, and the skin irritation test result was "non-irritating". The outer microcapsule slow-release structure avoids direct contact of essential oils with the skin, the inner layer uses safe and skin-friendly materials, and the middle layer of meltblown fabric provides basic filtration protection. Thus, while ensuring safety during pregnancy and postpartum, it achieves the dual functions of physical and mental comfort and basic protection. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a lemon-ginger composite essential oil microcapsule anti-pregnancy reverse silk mask proposed in this invention; Figure 2 This is a microscopic schematic diagram of the microcapsule adhesion and sustained-release mechanism of a lemon-ginger composite essential oil microcapsule anti-pregnancy silk mask and its preparation method proposed in this invention.

[0016] The layers consist of: 1. Outer layer; 2. Middle filter layer; 3. Inner skin-friendly layer. Detailed Implementation

[0017] The technologies described below will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Example

[0018] Lemon-ginger compound essential oil microcapsule anti-pregnancy silk mask, including the mask body and ear loops. The mask body is a three-layer composite 3D structure, from the outside to the inside: outer layer (1) slow-release layer, middle layer (2) filter layer and inner skin-friendly layer; the outer layer (1) slow-release layer is composed of double-layer silk fabric treated with microcapsule finishing solution, which is loaded with lemon-ginger compound essential oil microcapsules. The core material of the microcapsules is a mixture of lemon essential oil and ginger essential oil in a 1:1 mass ratio, and the wall material is a mixture of gelatin and gum arabic in a 1:1 mass ratio. The average particle size of the microcapsules is 5μm.

[0019] The middle layer (2) filter layer is made of meltblown nonwoven fabric, and the inner skin-friendly layer is made of 100% mulberry silk crepe satin fabric without any functional finishing. The 3D three-dimensional structure design includes an outwardly protruding breathing cavity in the middle of the mask along the bridge of the nose and the contour of the chin, and a built-in memory nose strip at the bridge of the nose.

[0020] The preparation method includes the following steps: S1. Preparation of Lemon-Ginger Compound Essential Oil Microcapsules: 100g of lemon essential oil and 100g of ginger essential oil were mixed at a 1:1 mass ratio to obtain a mixed essential oil; 200g of gelatin was added to 200g of deionized water, and stirred for 15 minutes at 8000 r / min using a high-shear dispersing emulsifier under a constant temperature of 50℃ for 15 minutes to form a gelatin solution; the mixed essential oil was added to the gelatin solution, and stirring was continued at 8000 r / min. Stirring at 15 r / min for 15 minutes to form a stable O / W oil-in-water emulsion, controlling the oil droplet size between 5-10 μm; while stirring, slowly add 200 g of gum arabic, and adjust the pH to 4.0-4.2 with 10% acetic acid solution. Gelatin and gum arabic undergo a coagulation reaction, depositing on the surface of the essential oil droplets to form capsule walls; turn on the cooling circulating water to slowly lower the system temperature to below 10℃ to gel the capsule walls; then add 50 g of glutaraldehyde crosslinking agent, adjust the pH to 8.5-9.0, and raise the temperature to 40℃ for 3 hours to solidify and harden the capsule walls; filter the product, wash it multiple times with water to remove residual crosslinking agent, and finally spray dry to obtain microcapsule powder.

[0021] S2. Microcapsule impregnation finishing of silk fabric: Prepare the finishing solution, taking 1L as an example: 40g of anti-pregnancy essential oil microcapsules, 25g of water-based polyurethane adhesive, 10g of silk-specific softener, and the remainder of deionized water; add the microcapsule powder to the water, stir at high speed to disperse evenly, then add the adhesive and softener to prepare a homogeneous finishing solution; immerse the silk fabric in the working solution, using a "two-dip, two-padding" process, with an immersion time of 2 minutes, a padding pressure of 0.3 MPa, and control the liquid retention rate between 75% and 80%; send the padded fabric to a setting machine, pre-dry at 80-90℃ for 3 minutes; bake at 110-120℃ for 2 minutes to allow the adhesive to undergo a cross-linking reaction, firmly adhering the microcapsules to the surface of the silk fibers and the gaps in the yarn; lightly wash the fabric to remove surface dye and unbound microcapsules, and after drying, obtain an anti-pregnancy silk fabric with long-lasting fragrance.

[0022] S3. Sewing and forming of the 3D mask: The silk fabric treated in step S2 is used as the outer layer (1), the meltblown nonwoven fabric as the middle layer (2), and the untreated plain crepe silk fabric as the inner layer. The fabric is cut, stacked, and sewn according to the 3D pattern. The fabric is cut according to the preset 3D pattern using a laser cutting machine. The pattern is reserved for the curvature of the bridge of the nose and the chin to form a breathing chamber with a raised center. The outer, middle, and inner layers are aligned and sewn along the central axis and edged. A shaping memory nose strip is implanted at the bridge of the nose to prevent fogging of glasses due to breath. Adjustable elastic soft ear loops are sewn on both sides to avoid ear irritation and dizziness. After ultraviolet sterilization, each mask is individually sealed and packaged. Example

[0023] Lemon-ginger-peppermint composite essential oil microcapsule anti-pregnancy silk mask, including the mask body and ear loops. The mask body is a three-layer composite 3D structure, from the outside to the inside: outer layer (1) slow-release layer, middle layer (2) filter layer and inner skin-friendly layer; the outer layer (1) slow-release layer is composed of double-layer silk fabric treated with microcapsule finishing solution, which is loaded with lemon-ginger-peppermint composite essential oil microcapsules. The core material of the microcapsules is a mixture of lemon essential oil, ginger essential oil and peppermint essential oil in a mass ratio of 1:1:0.5, and the wall material is a mixture of chitosan and sodium alginate in a mass ratio of 1:0.8. The average particle size of the microcapsules is 8μm.

[0024] The middle layer (2) filter layer is made of meltblown nonwoven fabric. The inner skin-friendly layer is made of 100% mulberry silk crepe satin fabric without any functional finishing. The 3D three-dimensional structure design includes outwardly protruding breathing chambers along the bridge of the nose and the chin contour in the middle of the mask, and a built-in memory nose strip at the bridge of the nose.

[0025] The preparation method includes the following steps: S1. Preparation of Lemon-Ginger-Peppermint Composite Essential Oil Microcapsules: 100g lemon essential oil, 100g ginger essential oil, and 50g peppermint essential oil were mixed in a mass ratio of 1:1:0.5 to obtain a mixed essential oil; 150g chitosan was added to 500g deionized water and stirred to dissolve, forming a chitosan solution; 200g sodium alginate was added to 500g deionized water and stirred to dissolve, forming a sodium alginate solution; the mixed essential oil was added to the chitosan solution, and the mixture was subjected to high-shear dispersion emulsification at 8000 rpm in a 50℃ constant temperature water bath. Stirring at a speed of r / min for 15 minutes to form a stable O / W oil-in-water emulsion; while stirring, slowly add sodium alginate solution, and adjust the pH to 3.5-3.8 with 10% citric acid solution. Chitosan and sodium alginate undergo a coagulation reaction, depositing on the surface of the essential oil droplets to form capsule walls; turn on the cooling circulating water to slowly lower the system temperature to below 5℃ to gel the capsule walls; then add 30g of glutaraldehyde crosslinking agent, adjust the pH to 8.0-8.5, and raise the temperature to 35℃ for 2.5 hours to solidify and harden the capsule walls; filter the product, wash it multiple times with water to remove residual crosslinking agent, and finally spray dry to obtain microcapsule powder.

[0026] S2. Microcapsule impregnation finishing of silk fabric: Prepare the finishing solution, taking 1L as an example: 45g of anti-pregnancy essential oil microcapsules, 30g of water-based polyurethane adhesive, 15g of silk-specific softener, and the remainder of deionized water; add the microcapsule powder to the water, stir at high speed to disperse evenly, then add the adhesive and softener to prepare a homogeneous finishing solution; immerse the silk fabric in the working solution, using a "two-dip, two-padding" process, with an immersion time of 2 minutes, a padding pressure of 0.3 MPa, and control the liquid retention rate between 75% and 80%; send the padded fabric to a setting machine, pre-dry at 85-95℃ for 4 minutes; bake at 120-130℃ for 2.5 minutes to allow the adhesive to undergo a cross-linking reaction, firmly adhering the microcapsules to the surface of the silk fibers and the gaps in the yarn; lightly wash the fabric to remove surface dye and unbound microcapsules, and after drying, obtain an anti-pregnancy silk fabric with long-lasting fragrance.

[0027] S3. Sewing and forming of the three-dimensional mask: The silk fabric treated in step S2 is used as the outer layer (1), the meltblown nonwoven fabric as the middle layer (2), and the untreated plain crepe silk fabric as the inner layer. The fabric is cut, stacked, and sewn according to the 3D pattern. The fabric is cut according to the preset 3D pattern using a laser cutting machine. The pattern reserves the curvature of the bridge of the nose and the chin to form a breathing chamber with a raised center. The outer, middle, and inner layers are aligned and sewn along the central axis and edged. A shaping memory nose strip is implanted at the bridge of the nose to prevent fogging of glasses due to breath. Adjustable elastic soft ear loops are sewn on both sides to avoid ear irritation and dizziness. After ultraviolet sterilization, each mask is individually sealed and packaged.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, material, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, material, or apparatus.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lemon-ginger complex essential oil microcapsule anti-pregnancy real silk mask, characterized in that, The mask body is a three-layer composite 3D structure, and from outside to inside, it is an outer slow-release layer, a middle filter layer and an inner skin-friendly layer. The outer slow-release layer is composed of double-layer real silk fabric treated by microcapsule finishing liquid, and the microcapsule finishing liquid carries lemon-ginger compound essential oil microcapsules.

2. The lemon-ginger complex essential oil microcapsule anti-pregnancy false silk mask according to claim 1, characterized in that, The core material of the microcapsule is a compound of one or more of lemon essential oil, ginger essential oil and mint essential oil, and the wall material is one or a compound of several of gelatin, gum arabic, chitosan, sodium alginate and melamine resin, and the average particle size of the microcapsule is 1-20 μm.

3. The lemon-ginger complex essential oil microcapsule anti-pregnancy false silk mask according to claim 1, characterized in that, The middle filter layer is a melt-blown non-woven fabric.

4. The lemon-ginger complex essential oil microcapsule anti-pregnancy false silk mask according to claim 1, characterized in that, The inner skin-friendly layer is a 100% mulberry silk fibroin crepe satin fabric without any functional finishing.

5. The lemon-ginger complex essential oil microcapsule anti-pregnancy false silk mask according to claim 1, characterized in that, The 3D structure design includes a breathing cavity outwardly protruding at the middle part of the mask along the nose bridge line and the chin contour, and a memory nose strip is arranged in the nose bridge.

6. The method of claim 1-5, wherein the method of preparing the lemon-ginger complex essential oil microcapsule anti-pregnancy real silk mask is characterized in that, Specifically, the following steps are included: S1. Preparation of lemon-ginger compound essential oil microcapsules: using complex coagulation method, taking gelatin and gum arabic as wall material, and taking mixed liquid of lemon essential oil and ginger essential oil with a mass ratio of 1:1 as core material, after emulsification, coagulation, solidification, washing and drying, microcapsule powder is obtained; specifically including: Emulsification: 100 parts of mixed essential oil is added to 200 parts of gelatin, and stirred at a speed of 8000 r / min for 15 minutes under 50℃ constant temperature water bath using high shear dispersion emulsifier to form stable O / W oil-in-water emulsion, and the oil droplet particle size is controlled between 5-10 μm; Coagulation: under stirring, 200 parts of gum arabic and 400 parts of deionized water are slowly added for dilution; 10% acetic acid solution is used to adjust the pH value to 4.0-4.2, at this time, the charges of gelatin and gum arabic are opposite, complex coagulation reaction occurs, and the capsule wall is formed on the surface of the essential oil droplet; Solidification: open the cooling circulating water, slowly reduce the system temperature to below 10℃, make the capsule wall gelatinize; then add crosslinking agent, adjust the pH to 8.5-9.0, and heat to 40℃ for 3 hours to make the capsule wall solidify and harden; Post-processing: the product is filtered, washed with water for several times to remove residual crosslinking agent, and finally spray dried to obtain anti-pregnancy reversal essential oil microcapsule powder; S2. Microcapsule dyeing finishing of real silk fabric: prepare finishing working solution containing microcapsule powder obtained in step S1, water-based polyurethane adhesive and softener; use padding-drying-curing process to treat real silk fabric as outer slow-release layer, wherein the curing temperature is 110-130℃, and the time is 1.5-3 minutes; The finishing liquid formula is as follows, taking 1L as an example: Anti-pregnancy reversal essential oil microcapsule: 40g, water-based polyurethane adhesive: 25g, real silk special softener: 10g, deionized water: the rest; the specific steps include: Liquid preparation: add microcapsule powder into water, stir and disperse uniformly at high speed, then add adhesive and softener to prepare uniform finishing working solution; Padding: immerse the real silk fabric in the working solution for 2 minutes to ensure that the finishing liquid penetrates into the fiber; Pre-drying: send the padded fabric into the setting machine for pre-drying at 80-90℃ for 3 minutes; Baking: high-temperature baking at 110-120℃ for 2 minutes to make the adhesive cross-linking reaction, and firmly adhere the microcapsules to the surface of silk fibers and the gaps of yarns; Lightly washing the fabric to remove the surface floating color and unbound microcapsules, and drying to obtain the anti-pregnancy silk fabric with long-lasting fragrance function; S3. Sewing and forming of the 3D mask: using the silk fabric treated in step S2 as the outer layer, melt-blown non-woven fabric as the middle layer, and untreated plain crepe silk fabric as the inner layer, cutting, superimposing, sewing according to the 3D profile, and assembling the plastic nose pad and ear band, specifically including: Cutting: using a laser cutting machine to cut the fabric according to the preset 3D profile, the profile needs to reserve the curvature of the nose bridge and chin to form a middle convex breathing chamber; Sewing: aligning the outer, middle and inner layers, sewing along the central axis, and performing edge covering treatment; Accessories installation: implanting a plastic memory nose strip at the nose bridge, and sewing elastic soft ear bands with adjustable length on both sides; Finished product packaging: after ultraviolet sterilization, single piece independent sealing packaging.

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