Air filtering non-woven fabric with wrinkled pre-filtering layer

Abstract

The utility model discloses an air filtering non-woven fabric with a wrinkled pre-filtering layer. The air filtering non-woven fabric comprises the pre-filtering layer, a fine filtering layer and a dust containing layer, the fine filtering layer is fixedly arranged on the exhaust side of the pre-filtering layer; the dust containing layer is fixedly arranged between the pre-filtering layer and the fine filtering layer; the dust containing layer is a heat-shrinkable grid non-woven fabric, the dust containing layer comprises uniformly distributed point-shaped supporting parts and strip-shaped connecting parts connected between the adjacent point-shaped supporting parts, and the pre-filtering layer is a non-woven fabric with a concave-convex wrinkle structure. According to the air filtering non-woven fabric with the wrinkled pre-filtering layer, the heat shrinkage grid non-woven fabric serves as the dust containing layer, the grid cloth before shrinkage is compounded with the pre-filtering layer, heat treatment promotes shrinkage of the dust containing layer, the flat pre-filtering layer is shrunk into a concave-convex wrinkled structure, the effective filtering area of the pre-filtering layer is increased, and meanwhile the air filtering effect is improved. The ash storage effect of the surface of the pre-filtering layer is improved, and an ash storage layer does not need to be additionally arranged; and the service life of the air filtering non-woven fabric is long.

Description

Technical Field

[0001] The utility model relates to the technical field of air filter materials, in particular to an air filter nonwoven fabric with a pleated pre-filtering layer. Background Art

[0002] As a consumable material that effectively reduces particulate matter in the air, air filtration non-woven fabrics are widely used in automobiles, purification workshops, filter cartridges, filter bags and other products.

[0003] The basic structure of air filter nonwovens includes a pre-filter layer, an ash layer and a fine filter layer stacked in sequence. Some nonwovens are also provided with an odor purification layer. The air carrying particles passes through the pre-filter layer and the high-efficiency filter layer in sequence. The larger particles adhere to the air intake surface of the pre-filter layer, and the smaller particles adhere to the ash layer on the air intake surface of the fine filter layer.

[0004] The defects of existing air filter non-woven fabrics are: first, the surface relative to the thickness direction of the non-woven fabric is a smooth surface, and the effective filtering area of ​​the pre-filter layer is limited; second, the air inlet surface of the pre-filter layer is usually provided with an ash storage layer to store larger particles intercepted by the pre-filter, and the structure is relatively complex; the ash storage layer is compounded on the surface of the fine filter layer, and its blocking effect leads to a reduction in the effective filtering area of ​​the fine filter layer, which in turn leads to a shorter service life of the air filter non-woven fabric. Utility Model Content

[0005] One of the purposes of the utility model is to overcome the defects existing in the prior art and provide an air filtration non-woven fabric with a pleated pre-filter layer, using a heat-shrinkable mesh non-woven fabric as an ash holding layer and processing the pre-filter layer into a concave-convex pleated structure to effectively increase the effective filtration area of ​​the pre-filter layer.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: an air filter nonwoven fabric with a pleated pre-filter layer, comprising:

[0007] Pre-filter layer;

[0008] A fine filter layer, fixedly arranged on the exhaust side of the pre-filter layer;

[0009] An ash containing layer is fixedly arranged between the pre-filtering layer and the fine-filtering layer;

[0010] The ash holding layer is a heat-shrinkable mesh non-woven fabric, comprising evenly distributed point-shaped support portions and strip-shaped connecting portions connected between adjacent point-shaped support portions, and the pre-filtering layer is a non-woven fabric with a concave-convex pleated structure.

[0011] A preferred technical solution is that the fine filtration layer is a non-woven fabric with a concave-convex pleated structure.

[0012] A preferred technical solution is that the point-shaped support portion has a first surface and a second surface opposite to each other along the thickness direction of the air filtration nonwoven fabric, the first surface is bonded to the pre-filtration layer by dispensing glue, and / or the second surface is bonded to the fine filtration layer by dispensing glue.

[0013] A preferred technical solution is that the heat shrinkable mesh non-woven fabric is a curled fiber non-woven fabric.

[0014] A preferred technical solution is that the expansion area of ​​the pre-filtration layer facing the ash holding layer per unit area is S1, the expansion area of ​​the fine filtration layer facing the ash holding layer per unit area is S2, and S1 is greater than S2.

[0015] A preferred technical solution is that the smallest unit closed figures enclosed by the point-shaped supporting parts and the strip-shaped connecting parts are all triangles.

[0016] A preferred technical solution is that the air inlet surface of the pre-filtration layer and / or the fine filtration layer is an antibacterial surface.

[0017] A preferred technical solution is that the strip-shaped connecting portion is an antibacterial connecting portion.

[0018] The advantages and beneficial effects of the utility model are:

[0019] The air filter nonwoven fabric with a pleated pre-filter layer uses a heat-shrinkable mesh nonwoven fabric as an ash holding layer, and the mesh fabric before shrinkage is compounded with the pre-filter layer. The heat treatment causes the ash holding layer to shrink, and the flat pre-filter layer shrinks into a concave-convex pleated structure, thereby increasing the effective filtering area of ​​the pre-filter layer and improving the ash storage effect on the surface of the pre-filter layer, without the need for a separate ash storage layer.

[0020] The dust holding layer is in a grid shape, which is beneficial to improving the effective filtering area of ​​the fine filter layer. The grid through holes and the predetermined thickness also provide a larger dust holding space for the fine filter layer, which is beneficial to improving the service life of the air filter non-woven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the cross-sectional structure of an air filtering nonwoven fabric with a pleated pre-filter layer in an embodiment;

[0022] Figure 2 is a schematic cross-sectional structure diagram of an air filter nonwoven fabric having a pleated pre-filter layer in another embodiment;

[0023] Figure 3 1. It is a schematic diagram of the top view of the structure of the ash-containing layer obtained by punching;

[0024] Figure 4 Schematic diagram of the top view of the ash-containing layer obtained by water spunlacing;

[0025] In the figure: 1, pre-filtration layer; 2, fine filtration layer; 3, dust holding layer; 301, point-shaped supporting part; 302, strip-shaped connecting part; a, glue dispensing. DETAILED DESCRIPTION

[0026] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0027] In the description of the present application, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0029] Example

[0030] like Figure 1-2 As shown, the embodiment has an air filtration nonwoven fabric with a pleated pre-filter layer, including a pre-filter layer 1, a fine filter layer 2 and an ash holding layer 3; the fine filter layer 2 is fixedly arranged on the exhaust side of the pre-filter layer 1; the ash holding layer 3 is fixedly arranged between the pre-filter layer 1 and the fine filter layer 2; the ash holding layer 3 is a heat-shrinkable mesh nonwoven fabric, the ash holding layer 3 includes evenly distributed point-shaped support portions 301 and strip-shaped connection portions 302 connected between adjacent point-shaped support portions 301, and the pre-filter layer 1 is a nonwoven fabric with a concave-convex pleated structure.

[0031] It can be understood that the filter hole size of the pre-filter layer 1 is larger than the filter hole size of the fine filter layer 2, and the mesh through holes of the ash holding layer 3 are much larger than the filter holes of the pre-filter layer 1 and the fine filter layer 2. In addition, the pores of the point-shaped support parts 301 and the strip-shaped connecting parts 302 in the ash holding layer 3 are not only related to the pores before heat shrinkage, but also depend on the heat shrinkage rate of the fibers constituting the point-shaped support parts 301 and the strip-shaped connecting parts 302.

[0032] The point-shaped support parts 301 are used to support and form dust-holding spaces. The point-shaped support parts 301 and the strip-shaped connecting parts 302 are both made of entangled non-woven fabric fibers. By controlling the pressure of the puncture water needle in the production of the non-woven fabric, the point-shaped support parts 301 with larger sizes and arranged in a predetermined array and the grid through holes between the point-shaped support parts 301 and the strip-shaped connecting parts 302 can be obtained.

[0033] Heat shrinkable mesh nonwoven fabric can be made by punching (such as Figure 3 As shown), or produced directly by puncture (as Figure 4 As shown). The point-shaped support part 301 and the strip-shaped connection part 302 made by punching are of equal thickness, while the point-shaped support part 301 and the strip-shaped connection part 302 made by puncturing can be of equal or unequal thickness. In order to further increase the dust holding space, the heat-shrinkable mesh non-woven fabric is made by puncturing, and the thickness of the strip-shaped connection part 302 is less than that of the point-shaped support part 301, that is, the number of fibers in the thickness direction of the strip-shaped connection part 302 is less than the number of fibers in the thickness direction of the point-shaped support part 301, and the limitation of the strip-shaped connection part 302 is looser.

[0034] When the heat-shrinkable mesh nonwoven fabric is produced by punching, the distribution of the point-shaped support portion 301 is regular; when the heat-shrinkable mesh nonwoven fabric is produced by puncturing, the uniform distribution of the point-shaped support portion 301 is not a strictly predetermined arrangement, and a more accurate understanding should be approximately uniform distribution or tending to uniform distribution.

[0035] Optionally, the uniform distribution of the point-shaped support parts 301 includes but is not limited to a rectangular array. In the unfolded plane of the air filtering nonwoven fabric, the point-shaped support parts 301 are uniformly distributed, and correspondingly, the grid through holes for accommodating dust and the strip-shaped connecting parts 302 are also uniformly distributed.

[0036] The heat shrinkable mesh nonwoven fabric is composed entirely or partially of heat shrinkable fibers, which are high-shrinkage polyacrylonitrile fibers (acrylic fibers) and / or polyester fibers (terylene).

[0037] like Figure 1 , 2 As shown, in another preferred embodiment, the fine filter layer 2 is a nonwoven fabric with a concave-convex pleated structure. Based on the predetermined area of ​​the air filter nonwoven fabric, the effective filter area of ​​the fine filter layer 2 is greater than the predetermined area. The larger effective filter area of ​​the pre-filter layer 1 and the fine filter layer 2 is also conducive to reducing the resistance of the filter, reducing the system pressure loss, and improving the energy-saving effect of the air filter device.

[0038] like Figure 3 , 4As shown, in another preferred embodiment, the point-shaped support portion 301 has a first surface and a second surface opposite to each other along the thickness direction of the air filter non-woven fabric, and the first surface is bonded to the pre-filtration layer 1 by glue dot a, and / or the second surface is bonded to the fine filtration layer 2 by glue dot a.

[0039] After the heat treatment, the fibers of the point-shaped support portion 301 are more tightly entangled, the deformation of the point-shaped support portion 301 along the thickness direction of the air nonwoven fabric is small, and the bonding structure with the pre-filtration layer 1 and / or the fine filtration layer 2 is stable and reliable.

[0040] In some embodiments, the heat shrinkable mesh nonwoven fabric is a curled fiber nonwoven fabric, and the specific model of the curled fiber can be T400 fiber.

[0041] like Figure 2 As shown, in another preferred embodiment, the expanded area of ​​the pre-filter layer 1 facing the ash holding layer 3 per unit area is S1, the expanded area of ​​the fine filter layer 2 facing the ash holding layer 3 per unit area is S2, and S1 is greater than S2.

[0042] When filtering air, the fine filter layer 2 has a small deformation, the pre-filter layer 1 is sunken toward the grid through hole of the ash holding layer 3, and the pre-filter layer 1 is concave and convex as a whole, and the ash storage capacity and service life are further improved. The air filter non-woven fabric is assembled on the filter element, and the pre-filter layer 1 is convex away from the ash holding layer during pulse backblowing, and the deformation is large after backblowing, so that the ash storage can be more effectively separated from the pre-filter layer 1.

[0043] The production steps of the air filter nonwoven fabric of this embodiment include:

[0044] S1: The flat pre-filter layer 1 is glued to one surface of the dust-receiving layer 3 by applying glue a, and heated to a temperature T1. The dust-receiving layer 3 undergoes the first heat shrinkage, and the pre-filter layer 1 generates concave-convex wrinkles;

[0045] S2: glue a is applied to the other surface of the ash holding layer 3 to bond the smooth fine filter layer 2, and the temperature is further heated to T2 which is slightly higher than T1. The heat preservation time is controlled, and the concave-convex folds of the pre-filter layer 1 are further deepened, and the fine filter layer 2 has slightly concave-convex folds.

[0046] like Figure 3 , 4 As shown, in another preferred embodiment, the minimum unit closed figures formed by the point-shaped support parts 301 and the strip-shaped connecting parts 302 are all triangles. Compared with the minimum unit closed figures with more sides such as squares and hexagons, the number of point-shaped support parts 301 is larger, and the composite structure with the pre-filter layer 1 and the fine filter layer 2 is stable and reliable; the dust-containing layer 3 has higher dimensional stability in its own spreading state, which is conducive to improving the dimensional stability of the air filtration nonwoven fabric.

[0047] In some embodiments, the air inlet surface of the pre-filtration layer 1 and / or the fine filtration layer 2 is an antibacterial surface.

[0048] The antibacterial surface includes but is not limited to the following methods: the non-woven fabric is foam treated or sprayed with an antibacterial finishing liquid and then dried to obtain an antibacterial surface, the foam treatment liquid or the antibacterial finishing liquid contains at least one of an organic antibacterial agent and an inorganic antibacterial particle; the antibacterial non-woven fabric is used as a surface layer and composited to the surface of the filter material, the antibacterial non-woven fabric is obtained by treating a conventional non-woven fabric with an antibacterial finishing liquid, or the antibacterial non-woven fabric contains antibacterial fibers.

[0049] In some embodiments, the strip connection part 302 is an antibacterial connection part. Smaller particles retained in the fine filtration layer 2 not only accumulate on the air inlet surface, but also embed between the fibers of the strip connection part 302. The strip connection part 302 is set as an antibacterial connection part to further reduce the probability of mold in the air non-woven fabric dust storage layer 3.

[0050] The antibacterial function of the antibacterial connecting portion can be imparted by the antibacterial finishing liquid treatment mentioned above.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An air filtration nonwoven fabric having a pleated pre-filter layer, comprising: Pre-filter layer; A fine filter layer, fixedly arranged on the exhaust side of the pre-filter layer; An ash containing layer is fixedly arranged between the pre-filtering layer and the fine-filtering layer; It is characterized in that the ash holding layer is a heat-shrinkable mesh non-woven fabric, the ash holding layer includes evenly distributed point-shaped support parts and strip-shaped connecting parts connected between adjacent point-shaped support parts, and the pre-filter layer is a non-woven fabric with a concave-convex pleated structure.

2. The air filter nonwoven fabric with a pleated pre-filter layer according to claim 1, characterized in that: The fine filter layer is a non-woven fabric with a concave-convex pleated structure.

3. The air filtration nonwoven fabric with a pleated pre-filter layer according to claim 1, characterized in that: The point-shaped support portion has a first surface and a second surface opposite to each other along the thickness direction of the air filtering nonwoven fabric, the first surface is bonded to the pre-filtration layer by dispensing glue, and / or the second surface is bonded to the fine filtration layer by dispensing glue.

4. The air filtration nonwoven fabric with a pleated pre-filter layer according to claim 1, characterized in that: The heat shrinkable mesh nonwoven fabric is a curled fiber nonwoven fabric.

5. The air filtration nonwoven fabric with a pleated pre-filter layer according to claim 2, characterized in that: The expanded area of ​​the pre-filtering layer directly opposite to the ash containing layer per unit area is S1, and the expanded area of ​​the fine filtering layer directly opposite to the ash containing layer per unit area is S2, and S1 is greater than S2.

6. The air filtration nonwoven fabric with a pleated pre-filter layer according to claim 1, characterized in that: The smallest unit closed figures enclosed by the point-shaped supporting parts and the strip-shaped connecting parts are all triangles.

7. The air filtration nonwoven fabric with a pleated pre-filter layer according to claim 1, characterized in that: The air inlet surface of the pre-filtration layer and / or the fine filtration layer is an antibacterial surface.

8. The air filtration nonwoven fabric with a pleated pre-filter layer according to claim 1, characterized in that: The strip-shaped connecting portion is an antibacterial connecting portion.

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