A multi-layer protective mask with both air permeability and barrier performance

Abstract

The utility model discloses a multilayer protective mask with ventilation and barrier performance, comprising a mask body and ear bands arranged on both sides of the mask body, the mask body is from outside to inside in turn outer layer, first filter layer, second filter layer and inner layer, wherein, outer layer and inner layer are warp knitted fabric layers, the warp knitted fabric layer is made of polyester fiber material, the first filter layer is made of polyimide material, and the second filter layer is made of melt-blown cloth material, the mask body is stitched to form an integrated four-layer laminated structure through the edges of the outer layer, the first filter layer, the second filter layer and the inner layer. The multilayer protective mask adopts polyimide and melt-blown cloth combination, and under the cooperation of the supporting layer, not only has good ventilation and barrier performance, due to the core material characteristics, gives certain bacteriostatic and virus effect, and also has good face close sealing performance, so as to enhance the comfort of the user.

Description

Technical Field

[0001] This utility model relates to the field of protective mask technology, specifically to a multi-layer protective mask that combines breathability and barrier properties. Background Technology

[0002] A face mask is a hygiene product, generally worn over the mouth and nose to filter the air entering the body, blocking harmful gases, odors, droplets, viruses, and other substances. It is typically made of gauze or paper. Face masks offer some filtration of air entering the lungs and are particularly effective during respiratory infectious disease outbreaks or in dusty or polluted environments. Therefore, face masks have two main functions: first, to prevent external solid particles, liquids, or droplets from entering the body. For example, anti-smog masks can absorb and filter out solid particles in the air, reducing the harm caused by smog particles; medical masks can kill bacteria and prevent the infection of healthcare workers by harmful substances such as blood and saliva droplets containing pathogens. Second, to prevent the wearer's own saliva droplets from infecting or infecting others. For example, wearing a mask can reduce the spread of viruses when a person with a cold wears one; and food service workers can wear masks to prevent food contamination, promoting hygiene and health.

[0003] Current protective masks are generally made of non-woven fabric. To improve filtration efficiency, meltblown fabric is used as the filter material to block dust, bacteria, and viruses. Masks made of conventional non-woven fabric are usually not resistant to high temperatures and aging. For masks exported, they are tested and qualified before leaving the warehouse and meet EU standards. However, when the products arrive at the export destination by sea, some products may not meet the requirements. In addition, during the long sea voyage, due to the material's lack of aging resistance, a small amount of lint and flocculent material may form, thus affecting product quality.

[0004] Currently, most high-quality masks on the market meet the requirements of GB2626-2019 "Respiratory Protective Equipment - Self-priming Filtering Particulate Respirators" (filtration efficiency ≥95.0%, inspiratory and expiratory resistance ≤210Pa). However, their filtration efficiency and resistance still do not meet people's requirements for high-efficiency and low-resistance masks. Since filtration efficiency and filtration resistance are two directly proportional physical quantities, when the filtration efficiency increases, the filtration resistance also increases. Increased resistance can cause people to feel stuffy, dizzy, and even hypoxia when wearing a mask, which can seriously endanger their health.

[0005] In recent years, with the application of new materials, polyimide (PI) microfiber fabrics have been widely used in many fields due to their excellent comprehensive properties, including high-temperature dust filter materials, electrical insulation materials, various high-temperature flame-retardant protective clothing, parachutes, heat-sealing materials, composite material reinforcing agents, and radiation-resistant materials. Therefore, for mask export processing enterprises, it is essential to provide multi-layered protective masks that balance breathability and barrier properties to meet export requirements and comply with EN 149:2001+A1:2009 standards, ensuring masks have excellent filtration efficiency, low filtration resistance, and good breathability. Utility Model Content

[0006] The technical problem to be solved by this utility model is to address the problems existing in the background art, thereby providing a mask that combines breathability and barrier properties, so that it has good breathability and filtration effect, and can also meet the requirements of avoiding the impact of environmental temperature on product quality during long-term sea transportation, so as to meet export needs. Specifically, it is a multi-layer protective mask that combines breathability and barrier properties.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a multi-layer protective mask that combines breathability and barrier performance, including a mask body and ear loops disposed on both sides of the mask body. The mask body consists of an outer layer, a first filter layer, a second filter layer and an inner layer from the outside to the inside. The outer layer and the inner layer are warp-knitted fabric layers made of polyester fiber material. The first filter layer is made of polyimide, and the second filter layer is made of meltblown fabric material. The auxiliary filter and support layer is made of polyurethane sponge material. The mask body is formed into an integrated four-layer stacked structure by sewing the edges of the outer layer, the first filter layer, the second filter layer and the inner layer together.

[0008] Furthermore, the multi-layer protective mask of this utility model, which combines breathability and barrier performance, is provided with an auxiliary filtration and support layer between the second filter layer and the inner layer; the mask body is formed into an integrated five-layer stacked structure by stitching together the outer layer, the first filter layer, the second filter layer, the auxiliary filtration and support layer, and the edges of the inner layer.

[0009] Furthermore, in the multi-layer protective mask of this invention that combines breathability and barrier properties, the support layer is made of sponge material.

[0010] Furthermore, in the multi-layer protective mask of this utility model that combines breathability and barrier properties, the sponge material is made of polyurethane sponge material, and the thickness of the support layer is 2-5mm.

[0011] Furthermore, the multi-layer protective mask of this utility model, which combines breathability and barrier properties, also has a nose bridge strip made of built-in double-core iron wire and PP material along the upper edge of the mask body.

[0012] The multi-layer protective mask of this invention, which combines breathability and barrier properties, has the following advantages compared with the prior art: Because a first filter layer and a second filter layer are provided between the outer and inner layers, the first and second filter layers not only enhance breathability and filtration efficiency, but also prevent the product quality from being affected by ambient temperature during long-distance sea transport, thus meeting export requirements. Furthermore, the added auxiliary filter and support layers not only enhance the stability of the mask and further improve filtration efficiency, but also prevent collapse during use, which could lead to a reduction in the filtration area and difficulty breathing.

[0013] Therefore, the multi-layer protective mask described in this utility model, which combines polyimide and meltblown fabric and is supported by an auxiliary filter layer, not only has excellent breathability and barrier properties, but also excellent temperature resistance. Due to the characteristics of the core materials, it has certain antibacterial and antiviral effects, and also has excellent facial fit and sealing performance to enhance the user's comfort. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structure of the multi-layer protective mask of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the multi-layer protective mask described in this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the mask body described in this utility model.

[0016] The diagram shows: 1-Mask body, 11-Outer layer, 12-First filter layer, 13-Second filter layer, 14-Auxiliary filter and support layer, 15-Inner layer, 2-Ear loops, 3-Nose bridge strip. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0018] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," and "right" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "provided with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, 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, article, or apparatus. Example 1

[0021] like Figures 1 to 3 As shown, this embodiment provides a multi-layer protective mask that combines breathability and barrier performance, including a mask body 1 and ear loops 2 disposed on both sides of the mask body 1. The mask body 1 consists of an outer layer 11, a first filter layer 12, a second filter layer 13, and an inner layer 15 from the outside to the inside. The outer layer 11 and the inner layer 15 are warp-knitted fabric layers made of polyester fiber material. The first filter layer 12 is made of polyimide, and the second filter layer 13 is made of meltblown fabric material. The mask body 1 is formed into an integrated four-layer stacked structure by sewing the edges of the outer layer 11, the first filter layer 12, the second filter layer 13, and the inner layer 15 together.

[0022] Furthermore, in the multi-layer protective mask described in this embodiment, the upper edge of the mask body 1 is also provided with a nose bridge strip 3 made of built-in double-core iron wire and PP material. Through the configured nose bridge strip 3, the mask body 1 can fit well with the user's face.

[0023] In the actual manufacturing process of the multi-layer protective mask described in this embodiment, the first filter layer 12 uses polyimide with a relative density of 1.29–1.55, a thickness of 4–16 μm, and a porosity greater than 80%; the second filter layer 13 uses meltblown fabric with a basis weight of 10–30 g / m². 2 The outer layer 11 and inner layer 15 have a thickness of 0.1–0.5 mm, a filtration efficiency of ≥90%, and a filtration resistance of ≤30 Pa. The outer layer 11 and inner layer 15 have a thickness of 10–20 μm, a porosity of 80–90%, and a pore size of 1.5–2.5 μm. The mask body 1 has a filtration efficiency of ≥95%, and its filtration resistance at a flow rate of 95 L / min is ≤240 Pa for inhalation and ≤300 Pa for exhalation. Simultaneously, the inhalation and exhalation resistances of the mask body 1 at a flow rate of 95 L / min are required to be ≤240 Pa for inhalation and ≤300 Pa for exhalation. Example 2

[0024] This embodiment is based on Embodiment 1. To enhance the stability of the mask and prevent collapse during use, which would reduce the filtration area and cause breathing difficulties, thus affecting its performance, this embodiment provides a multi-layered protective mask that balances breathability and barrier properties. An auxiliary filtration and support layer 14 is provided between the second filter layer 13 and the inner layer 15. The mask body 1 is formed by stitching together the outer layer 11, the first filter layer 12, the second filter layer 13, the auxiliary filtration and support layer 14, and the edges of the inner layer 15 to create an integrated five-layer stacked structure. The auxiliary filtration and support layer 14 is made of sponge material.

[0025] In the specific manufacturing process, the sponge material used is polyurethane sponge, and the thickness of the auxiliary filter and support layer 14 is 2-5 mm. Since the core component of polyurethane sponge is polyurethane, which is formed by the chemical reaction of isocyanate (NCO) and polyols (such as polyether and polyester) to create a porous structure, this structure gives it excellent elasticity, water absorption, and heat insulation properties. Using it as a support material not only provides excellent support for the mask body 1, preventing collapse during use and thus avoiding breathing difficulties due to reduced filtration area, but also improves user comfort through the added auxiliary filter and support layer 14.

[0026] The protective principle of face masks is based on their filtration efficiency against harmful substances. The higher the filtration efficiency, the better the air purification, the healthier the air inhaled, and the better the protective effect of the mask. Since breathability is one of the main factors affecting wearing comfort, poor breathability can cause breathing difficulties. The breathability of a mask is related to its filtration efficiency.

[0027] The multi-layer protective mask of this utility model has an outer layer 11 and an inner layer 15 that are warp-knitted fabric layers. The warp-knitted fabric layers are made of 100% polyester fiber material. Polyester fiber, also known as polyester, is a synthetic fiber obtained by spinning polyester, which is a polymer compound formed by the condensation of organic dibasic acid and diol. Polyester fiber is strong and durable, wrinkle-resistant and non-iron, and does not stick to lint. It is mainly used for clothing and interior decoration. Its biggest advantage is that it has good wrinkle resistance and shape retention, and has high strength and elastic recovery ability.

[0028] The first filter layer 12 is made of polyimide. Polyimide (PI) is a type of polymer containing an imide ring (-CO-NH-CO-) in its main chain. It is one of the organic polymer materials with the best comprehensive performance. It can withstand high temperatures of over 400℃, has a long-term operating temperature range of -200 to 300℃, has no obvious melting point, and has high insulation performance. At 103 Hz, its dielectric constant is stable at 4.0, while its dielectric loss rate is as low as 0.004 to 0.007, belonging to the F to H grade of insulating materials.

[0029] Furthermore, the auxiliary filter and support layer 14 is made of polyurethane foam. The core component of polyurethane foam is polyurethane, which is formed by the chemical reaction of isocyanate (NCO) and polyols (such as polyether and polyester) to create a porous structure. This structure endows it with excellent elasticity, water absorption, and heat retention properties. Therefore, by strictly controlling the materials of each structural layer, the prepared mask can meet the technical requirements of both breathability and barrier properties, while also satisfying the requirement of temperature resistance.

[0030] To demonstrate that the multi-layer protective mask described in this utility model has excellent breathability and barrier properties, penetration rate and breathing resistance were tested. The testing was conducted in accordance with the European Union standard, namely Test standard(s): EN 149:2001+A1:2009 "Respiratory protective devices for particulate protection - requirements, inspection and marking".

[0031] According to the above standards, the penetration rate and breathing resistance of the multi-layer protective mask described in Example 1 were tested, and the test results are shown in Table 1 and Table 2.

[0032] Table 1. Penetration rate test results under saline and oily conditions.

[0033] Table 2. Results of respiratory resistance tests under different conditions

[0034] Using the multi-layer protective mask described in Example 2, penetration rate and breathing resistance were tested for samples of different thicknesses according to the same testing criteria. The test results are shown in Tables 3 and 4, respectively.

[0035] Table 3. Penetration rate test results under saline and oily conditions.

[0036] Table 4. Results of respiratory resistance tests under different conditions

[0037] As shown in Tables 1 to 4, the multi-layer protective mask described in this utility model has different features. Example 1 uses a multi-layer protective mask without auxiliary filter and support layer 14, while Example 2 uses a multi-layer protective mask with auxiliary filter and support layer 14. Since polyimide (PI) film has excellent comprehensive performance, its application in protective masks, combined with existing meltblown fabric, forms a multi-layer filtration structure. This not only enhances its breathability and filtration effect but also prevents the product quality from being affected by ambient temperature during long-term sea transport, thus meeting export requirements. At the same time, the added auxiliary filter and support layer 14 not only enhances the stability of the mask but also prevents it from collapsing during use, thus avoiding the problem of breathing difficulties due to reduced filtration area.

[0038] In summary, the multi-layer protective mask described in this utility model, which combines polyimide and meltblown fabric, and with the cooperation of auxiliary filtration and support layer 14, not only has excellent breathability and barrier properties, but also excellent temperature resistance, meeting the transportation needs in maritime environments, thus making the product compliant with EU standards. At the same time, due to the characteristics of the core materials, it has certain antibacterial and antiviral effects, and also has excellent facial fit and sealing performance to enhance user comfort.

[0039] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0040] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. The above description is only a preferred embodiment of this utility model and does not limit this utility model. Any minor modifications, equivalent substitutions and improvements made based on the technical solutions of this utility model should be included within the scope of protection of the technical solutions of this utility model.

Claims

1. A multi-layer protective mask with both air permeability and barrier performance, comprising a mask body and ear bands arranged on both sides of the mask body, characterized in that: The mask body consists of an outer layer, a first filter layer, a second filter layer, and an inner layer from the outside to the inside. The outer and inner layers are warp-knitted fabric layers made of polyester fiber material. The first filter layer is made of polyimide, and the second filter layer is made of meltblown fabric material. The mask body is formed into an integrated four-layer stacked structure by sewing the edges of the outer layer, the first filter layer, the second filter layer, and the inner layer together.

2. The multi-layer protective mask with both air permeability and barrier performance according to claim 1, characterized in that: An auxiliary filtration and support layer is provided between the second filter layer and the inner layer; the mask body is formed into an integral five-layer stacked structure by stitching together the outer layer, the first filter layer, the second filter layer, the auxiliary filtration and support layer, and the edge of the inner layer.

3. The multi-layer protective mask that combines breathability and barrier properties according to claim 2, characterized in that: The auxiliary filter and support layer are made of sponge material.

4. The multi-layer protective mask with both air permeability and barrier performance according to claim 3, characterized in that: The sponge material is polyurethane sponge material, and the thickness of the auxiliary filter and support layer is 2-5mm.

5. The multi-layer protective mask with both air permeability and barrier performance according to claim 1, characterized in that: The upper edge of the mask body is also equipped with a nose bridge strip made of built-in double-core iron wire and PP material.

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