Composite melt-blown cloth with efficient filtering function

Abstract

The utility model provides high-efficiency filtering composite melt-blown cloth which comprises a first supporting layer and a second supporting layer which are parallel to each other, and an outer layer, a middle layer and an inner layer are sequentially arranged between the first supporting layer and the second supporting layer from outside to inside. The outer layer, the middle layer and the inner layer are all wave-shaped melt-blown cloth, the fiber diameters of the outer layer, the middle layer and the inner layer are gradually decreased, and the outer layer, the middle layer and the inner layer are provided with wave crests and wave troughs which are alternately arranged; the wave troughs of the outer layer correspond to the wave crests of the middle layer, and the wave crests of the outer layer correspond to the wave troughs of the middle layer; the wave troughs of the middle layer correspond to the wave crests of the inner layer, and the wave crests of the middle layer correspond to the wave troughs of the inner layer; the first supporting layer and the second supporting layer are of a net-shaped structure formed by fibers in a crossed mode. According to the utility model, the wave crests and the wave troughs of the outer layer, the middle layer and the inner layer are distributed in a staggered manner, so that the filtering area is increased, and the filtering efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of meltblown fabric technology, specifically relating to a high-efficiency filtration composite meltblown fabric. Background Technology

[0002] Meltblown fabric is a nonwoven fabric made using a meltblown process. Its core characteristics stem from its unique fiber structure and production process, and it is widely used in masks, filter materials, and other fields.

[0003] In the prior art, Chinese utility model patent document with authorization announcement number CN217968757U discloses a high-filtration meltblown fabric. The recessed grooves, air-permeable channels, and chip-blocking protrusions allow air to pass through while blocking impurities and particles. Smaller particles that can pass through the air-permeable channels remain inside, further increasing the filtration effect. However, the planar structure of the meltblown fabric has a limited filtration area, which limits its filtration efficiency.

[0004] Therefore, it is necessary to design a high-efficiency composite meltblown fabric that increases filtration area and improves filtration efficiency to solve the current technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a composite meltblown fabric for high-efficiency filtration by increasing the filtration area and improving filtration efficiency.

[0006] The technical solution of this utility model is as follows: a high-efficiency filtration composite meltblown fabric, comprising a first support layer and a second support layer that are parallel to each other, wherein an outer layer, a middle layer and an inner layer are sequentially arranged between the first support layer and the second support layer from the outside to the inside; the outer layer, the middle layer and the inner layer are all wavy meltblown fabrics, the fiber diameter of the outer layer, the middle layer and the inner layer decreases, and the outer layer, the middle layer and the inner layer all have alternating peaks and troughs; the troughs of the outer layer correspond to the peaks of the middle layer, and the peaks of the outer layer correspond to the troughs of the middle layer; the troughs of the middle layer correspond to the peaks of the inner layer, and the peaks of the middle layer correspond to the troughs of the inner layer; the first support layer and the second support layer are a mesh structure made of cross-woven fibers.

[0007] Furthermore, both the first support layer and the second support layer are 20-30 mesh structures made of cross-linked fibers with a diameter of 0.05-0.15 mm.

[0008] Furthermore, the outer layer has a fiber diameter of 3~5μm; the middle layer has a fiber diameter of 1~3μm; and the inner layer has a fiber diameter of 0.1~1μm.

[0009] Furthermore, a skin-friendly layer is fixedly provided on the side of the second support layer opposite to the inner layer. The skin-friendly layer is a non-woven fabric, and the skin-friendly layer is connected to the second support layer by hot melt adhesive.

[0010] Furthermore, the outer layer's peaks are thermally bonded to the first support layer, the outer layer's troughs are thermally bonded to the middle layer's peaks, the middle layer's troughs are thermally bonded to the inner layer's peaks, and the inner layer's troughs are thermally bonded to the second support layer.

[0011] The beneficial effects of this utility model are:

[0012] (1) In this utility model, the outer, middle and inner layers are wavy, and the crests and troughs of the outer, middle and inner layers are distributed alternately, which increases the filtration area and improves the filtration efficiency.

[0013] (2) The fiber diameter of the outer layer, middle layer and inner layer decreases and the porosity also decreases step by step, so that the pressure drop is distributed in a gradient structure. The outer layer sacrifices a small amount of efficiency to obtain low resistance and reduce the initial pressure drop. The middle layer improves efficiency with a medium pressure drop. The inner layer completes the final interception with the smallest aperture when the airflow velocity has been reduced through the outer layer and middle layer, so as to avoid the concentration of high pressure drop.

[0014] (3) The first and second support layers of the mesh structure can not only improve the tensile strength of meltblown fabric, but also have little impact on the air permeability of meltblown fabric. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of an embodiment of the high-efficiency filtration composite meltblown fabric of this utility model.

[0016] Figure 2 This is one of the structural schematic diagrams of an embodiment of the high-efficiency filtration composite meltblown fabric of this utility model.

[0017] Figure 3 This is a schematic diagram of another embodiment of the high-efficiency filtration composite meltblown fabric of this utility model. Detailed Implementation

[0018] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are not intended to limit the present invention or its application or use in any way. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0019] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] like Figure 1 and 2 The high-efficiency filtration composite meltblown fabric shown includes a first support layer 1 and a second support layer 8 that are parallel to each other. An outer layer 2, a middle layer 3, and an inner layer 4 are sequentially arranged between the first support layer 1 and the second support layer 8 from the outside to the inside. The outer layer 2, middle layer 3, and inner layer 4 are all wavy meltblown fabrics with decreasing fiber diameters. Each of the outer layer 2, middle layer 3, and inner layer 4 has alternating peaks 5 and troughs 6. The troughs 5 of the outer layer 2 correspond to the peaks 6 of the middle layer 3, and the peaks 6 of the outer layer 2 correspond to the troughs 5 of the middle layer 3. The troughs 5 of the middle layer 3 correspond to the peaks 6 of the inner layer 4, and the peaks 6 of the middle layer 3 correspond to the troughs 5 of the inner layer 4. The first support layer 1 and the second support layer 8 are constructed with cross-woven fibers. The mesh structure is formed; in this embodiment, the outer layer 2, middle layer 3 and inner layer 4 are wavy, and the crests 6 and troughs 5 of the outer layer 2, middle layer 3 and inner layer 4 are distributed alternately, which increases the filtration area and improves the filtration efficiency; the fiber diameter of the outer layer 2, middle layer 3 and inner layer 4 decreases and the porosity also decreases step by step, so that the pressure drop is distributed in a gradient structure. The outer layer 2 sacrifices a small amount of efficiency for low resistance and reduces the initial pressure drop. The middle layer 3 improves efficiency with a moderate pressure drop. The inner layer 4 completes the final interception with the smallest pore size when the airflow speed has been reduced through the outer layer 2 and middle layer 3, so as to avoid the concentration of high pressure drop; the first support layer 1 and the second support layer 8 of the mesh structure can not only improve the tensile strength of the meltblown cloth, but also have little impact on the air permeability of the meltblown cloth.

[0021] In some embodiments, the first support layer 1 and the second support layer 8 are both 20-30 mesh structures made of cross-linked fibers with a diameter of 0.05-0.15 mm; this gives them a certain tensile strength while having little impact on the air permeability of the sprayed fleece; specifically, the first support layer 1 and the second support layer 8 are both 30 mesh structures made of cross-linked fibers with a diameter of 0.1 mm.

[0022] In some embodiments, the outer layer 2 has a fiber diameter of 3-5 μm, a porosity of 80%-90%, and a pore size of 5-10 μm. Its function is to intercept large particles and droplets with a diameter >5 μm, and to quickly remove major pollutants through inertial impaction and direct interception mechanisms, preventing large particles from clogging the micropores of the inner layer. The middle layer 3 has a fiber diameter of 1-3 μm, a porosity of 60%-70%, and a pore size of 2-5 μm. Its function is to capture particles of 0.5-5 μm. The inner layer 4 has a fiber diameter of 0.1-1 μm, a porosity of 40%-50%, and a pore size of 0.5-2 μm. Its function is to intercept submicron particles through Brownian diffusion and sieving effects. Specifically, the outer layer 2 has a fiber diameter of 5 μm, the middle layer 3 has a fiber diameter of 3 μm, and the inner layer 4 has a fiber diameter of 1 μm.

[0023] In some embodiments, such as Figure 3 As shown, a skin-friendly layer 7 is fixedly provided on the side of the second support layer 8 away from the inner layer 4. The skin-friendly layer 7 is made of non-woven fabric and is connected to the second support layer 8 by hot melt bonding. The skin-friendly layer 7 made of non-woven fabric has a smooth surface and no hard fibers, so it is not easy to cause friction and irritation when it comes into direct contact with the skin.

[0024] In some embodiments, the crests 6 of the outer layer 2 are thermally bonded to the first support layer 1, the troughs 5 of the outer layer are thermally bonded to the crests 6 of the middle layer 3, the troughs 5 of the middle layer 3 are thermally bonded to the crests 6 of the inner layer 4, and the troughs of the inner layer 4 are thermally bonded to the second support layer 8. During processing, the width of the above-mentioned thermally bonded area needs to be controlled. While ensuring strength, the width of the thermally bonded area should be minimized to avoid damaging the meltblown fabric fiber structure and causing a decrease in filtration efficiency. Specifically, the width of the above-mentioned thermally bonded area is 1.0~2.0mm.

[0025] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0026] The embodiments described above only illustrate some implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high-efficiency filtration composite meltblown fabric, characterized in that: It includes a first support layer and a second support layer that are parallel to each other, and an outer layer, a middle layer and an inner layer are arranged between the first support layer and the second support layer from the outside to the inside. The outer, middle, and inner layers are all wavy meltblown fabrics with decreasing fiber diameters and alternating peaks and troughs. The troughs of the outer layer correspond to the peaks of the middle layer, and the peaks of the outer layer correspond to the troughs of the middle layer. The troughs of the intermediate layer correspond to the peaks of the inner layer, and the peaks of the intermediate layer correspond to the troughs of the inner layer. The first support layer and the second support layer are a mesh structure made of cross-shaped fibers.

2. The high-efficiency filtration composite meltblown fabric according to claim 1, characterized in that: Both the first support layer and the second support layer are 20-30 mesh structures made of cross-linked fibers with a diameter of 0.05-0.15 mm.

3. The high-efficiency filtration composite meltblown fabric according to claim 1, characterized in that: The outer layer has a fiber diameter of 3-5 μm; the middle layer has a fiber diameter of 1-3 μm; and the inner layer has a fiber diameter of 0.1-1 μm.

4. The high-efficiency filtration composite meltblown fabric according to claim 1, characterized in that: A skin-friendly layer is fixedly provided on the side of the second support layer away from the inner layer. The skin-friendly layer is a non-woven fabric, and the skin-friendly layer is connected to the second support layer by hot melt adhesive.

5. The high-efficiency filtration composite meltblown fabric according to claim 1, characterized in that: The outer layer's peaks are thermally bonded to the first support layer, the outer layer's troughs are thermally bonded to the peaks of the middle layer, the middle layer's troughs are thermally bonded to the peaks of the inner layer, and the inner layer's troughs are thermally bonded to the second support layer.

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