Unidirectional shrinkage air filtering non-woven fabric and filtering device

Abstract

The utility model discloses a one-way shrinkage air filtering non-woven fabric which comprises a pre-filtering layer and a fine filtering layer, the fine filtering layer is fixedly compounded on the exhaust side of the pre-filtering layer; the pre-filtering layer is alternately provided with first shrinkage areas and flat areas in the first direction, the first shrinkage areas are provided with thermal shrinkage wrinkles extending in the second direction, and the first direction is perpendicular to the second direction. According to the one-way shrinking air filtering non-woven fabric, the pre-filtering layer is arranged in different areas; the first shrinking area is favorable for increasing the effective filtering area and the filtering capacity of the pre-filtering layer, especially when the pre-filtering layer intercepts gas with more particulate matters; the flattening area is used for arranging the fold edge of the air non-woven fabric, the overall thickness of the non-woven fabric at the fold tip is small, the fiber tension is small, the probability of non-woven fabric breakage caused by friction between the fold tip and the outer-layer net-shaped sleeve is reduced, and then the service life of the filtering device is prolonged. The utility model further discloses a filtering device.

Description

Technical Field

[0001] The utility model relates to the technical field of air filter materials, in particular to a unidirectional shrink air filter nonwoven fabric and a filter device. 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] There are two main ways to use air filter non-woven fabrics. One is in a flat state, such as a filter bag, and the other is in a pleated state, fixed between the frame or the filter cartridge flange. The air filter element is made into a pleated shape mainly to improve the filtering capacity, reduce the intake resistance, and increase the air flow. Taking the automobile filter as an example, increasing the dust holding capacity is one of the main optimization directions of the filter. In addition, one of the main disadvantages of pleated non-woven fabrics is that the fibers are stretched at the tips of the pleats, and the tips of the pleats rub against the outer mesh sleeve during the recoil cleaning of compressed air, which can easily cause the non-woven fabric to be damaged. Utility Model Content

[0004] One of the purposes of the utility model is to overcome the defects existing in the prior art and provide a one-way shrinkage air filter non-woven fabric. The first shrinkage area is conducive to improving the filtering and ash storage capacity. The continuous pleats of the air non-woven fabric are arranged in the flat area to avoid the heat shrinkage fibers in the pleated area from being too tight and affecting the service life of the air filter device.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is: a unidirectional shrink air filter nonwoven fabric, comprising:

[0006] Pre-filter layer;

[0007] A fine filter layer, fixedly and compositely arranged on the exhaust side of the pre-filter layer;

[0008] The pre-filter layer is alternately provided with first shrinkage areas and flat areas along a first direction, wherein the first shrinkage areas have heat shrinkage folds extending along a second direction, and the first direction and the second direction are perpendicular to each other.

[0009] A preferred technical solution is that the pre-filtration layer includes a filtration substrate layer and a heat-shrinkable non-woven fabric strip, and the heat-shrinkable non-woven fabric strip is sandwiched between the filtration substrate layer and the fine filtration layer; the heat-shrinkable non-woven fabric strip is arranged in the first shrinkage area; the heat-shrinkable non-woven fabric strip includes heat-shrinkable filaments and / or straight-laid heat-shrinkable fiber webs extending along the first direction, and straight-laid non-heat-shrinkable fiber webs extending along the second direction.

[0010] A preferred technical solution is that the filter substrate layer and the heat shrinkable non-woven fabric strip are compounded by fiber entanglement.

[0011] A preferred technical solution is that the flattened area includes a first flattened area and a second flattened area, the width of the first flattened area along the first direction is greater than the width of the second flattened area, and the first flattened area and the second flattened area are alternately arranged along the first direction.

[0012] A preferred technical solution is to further include an activated carbon deodorization layer, wherein the activated carbon deodorization layer is compositely arranged on the exhaust side of the fine filtration layer.

[0013] A preferred technical solution is that the fine filter layer is provided with a second shrinkage zone, the second shrinkage zone has heat shrinkage folds extending along the second direction, and the first shrinkage zone and the second shrinkage zone are arranged opposite to each other along the thickness direction of the unidirectional shrinkage air filter nonwoven fabric.

[0014] The second purpose of the utility model is to provide a filtering device based on the above-mentioned unidirectional shrinkage air filter non-woven fabric, wherein the unidirectional shrinkage air filter non-woven fabric is a pleated structure composed of continuous V-shaped grooves, and the pre-filter layer is the groove surface of the V-shaped groove; the bottom fold line and the top fold line of the V-shaped groove both extend along the second direction and are arranged in the flat area.

[0015] A preferred technical solution is that in the groove surface of the same V-shaped groove, the interval between the groove bottom fold line and the first wrinkle zone is a first interval, the interval between the groove top fold line and the first wrinkle zone is a second interval, and the first interval is greater than the second interval.

[0016] A preferred technical solution is that the flattening area is symmetrically arranged on both sides of the groove bottom fold line and the groove top fold line.

[0017] A preferred technical solution is that the V-shaped groove has a first groove surface and a second groove surface that are opposite to each other along the groove width direction, and the first shrinkage areas of the first groove surface and the second groove surface are spaced apart along the groove width direction.

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

[0019] The one-way shrinkage air filter nonwoven fabric divides the pre-filter layer into zones: the first shrinkage zone is conducive to increasing the effective filter area and filter capacity of the pre-filter layer, especially when filtering and processing the gas with more particles intercepted by the pre-filter layer;

[0020] The flat area is used to set the pleated hem of the air non-woven fabric. Compared with setting the pleated hem in the first wrinkled area, the overall thickness of the non-woven fabric at the pleat tip is smaller, the fiber tension is smaller, and there is no tensioning structure of the heat-shrinkable fiber, which is beneficial to reduce the probability of non-woven fabric being damaged due to friction between the pleat tip and the outer mesh sleeve, thereby extending the service life of the filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 11 is a schematic diagram of the cross-sectional structure of the unidirectional shrink air filtering nonwoven fabric of the embodiment;

[0022] Figure 2 yes Figure 1 A schematic diagram of the top view of the unidirectional shrink air filter nonwoven fabric;

[0023] Figure 3 is a schematic cross-sectional structure diagram of a unidirectional shrink air filtering nonwoven fabric according to another embodiment;

[0024] Figure 4 1 is a schematic diagram of the three-dimensional structure of the unidirectional shrinkage air filtering nonwoven fabric with a pleated structure in the filter device of the embodiment;

[0025] Figure 5 is a schematic diagram of the three-dimensional structure of a unidirectionally shrunk air filtering nonwoven fabric with a pleated structure in a filtering device of another embodiment;

[0026] In the figure: 1, pre-filtration layer; 101, first shrinkage area; 102, flat area; 102a, first flat area; 102b, second flat area; 1a, filter substrate layer; 1b, heat-shrinkable non-woven fabric strip; 2, fine filtration layer; 201, second shrinkage area; 3, activated carbon deodorization layer; 4, groove bottom fold line; 5, groove top fold line; 6, first groove surface; 7, second groove surface. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Example

[0031] like Figure 1-3As shown, the unidirectional shrinkage air filtration nonwoven fabric of the embodiment includes a pre-filter layer 1 and a fine filter layer 2; the fine filter layer 2 is fixedly composited and arranged on the exhaust side of the pre-filter layer 1; along the first direction, the pre-filter layer 1 is alternately provided with first shrinkage areas 101 and flat areas 102, and the first shrinkage areas 101 have heat-shrinkage folds extending along the second direction, and the first direction and the second direction are perpendicular to each other.

[0032] The first direction is Figure 1 , 2 The middle X direction, the second direction is Figure 2 Based on the heat shrinkage performance of the fiber, the heat shrinkage wrinkles are generated by heat treatment, so the extension length of the second direction is random, that is, the second direction length of the heat shrinkage wrinkles can be selected to be equal to or less than the second direction size of the air filtration nonwoven fabric.

[0033] It can be understood that the heat-shrinkable fibers or filaments that can cause the pre-filter layer 1 to shrink and form the first shrinkage area 101 avoid being disposed in the flat area 102 .

[0034] The surface of the pre-filtering layer 1 corresponding to the first shrinkage area 101 forms a concave-convex structure which is conducive to ash storage.

[0035] like Figure 1 , 3 As shown, in another preferred embodiment, the pre-filtration layer 1 includes a filtration substrate layer 1a and a heat-shrinkable non-woven fabric strip 1b, and the heat-shrinkable non-woven fabric strip 1b is sandwiched between the filtration substrate layer 1a and the fine filtration layer 2; the heat-shrinkable non-woven fabric strip 1b is arranged in the first shrinkage area 101; the heat-shrinkable non-woven fabric strip 1b includes heat-shrinkable filaments and / or straight-laid heat-shrinkable fiber webs extending along a first direction, and straight-laid non-heat-shrinkable fiber webs extending along a second direction.

[0036] The production process of the pre-filter layer 1 includes but is not limited to the following methods: the heat-shrinkable non-woven fabric with predetermined single-oriented heat-shrinkable fibers is punched to obtain a long hole corresponding to the flat area 102, the heat-shrinkable non-woven fabric is compounded with the filter substrate layer 1a without the pre-filter layer 1, and the two sides of the two-layer composite structure of the heat-shrinkable non-woven fabric and the filter substrate layer 1a are rolled and sheared so that the two ends of the long hole are open, and a two-layer composite structure with heat-shrinkable non-woven fabric strips spaced from each other in the first direction is obtained, and finally a pre-filter layer 1 with alternating first shrinkage areas 101 and flat areas 102 is obtained by heat treatment. Further, the pre-filter layer 1 is compounded with the fine filter layer 2 to obtain a unidirectional shrinkage air filtration non-woven fabric in which only the pre-filter layer 1 is partially wrinkled.

[0037] When the heat-shrinkable fibers of the heat-shrinkable non-woven fabric are oriented in more than two directions or in any direction, the second-direction dimension of the pre-filtration layer 1 after heat treatment will also be reduced. Based on the predetermined second-direction dimension of the air filtration non-woven fabric, a larger side margin of the composite structure needs to be reserved for trimming.

[0038] In some embodiments, the filter substrate layer 1a and the heat shrinkable nonwoven fabric strip 1b are compounded by fiber entanglement. Compared with gluing or thermal compounding, the use of airflow or needle punching to drive the fibers of the filter substrate layer 1a and the heat shrinkable nonwoven fabric strip 1b to penetrate the two-layer composite structure and entangle with each other has less adverse effect on the effective filtration area of ​​the nonwoven fabric.

[0039] like Figure 3 As shown, in another preferred embodiment, the flattened area 102 includes a first flattened area 102a and a second flattened area 102b, the width of the first flattened area 102a along the first direction is greater than the width of the second flattened area 102b, and the first flattened area 102a and the second flattened area 102b are alternately arranged along the first direction.

[0040] The width of the flat area 102 along the first direction is the same. When the flat area 102 is symmetrically arranged on both sides of the pleat tip fold and the pleat bottom fold of the non-woven fabric pleat structure, the first wrinkled area 101 is at an equal distance from the pleat tip fold and the pleat bottom fold. In the air filter cartridge structure, the air inlet filter surface from the pleat tip fold to the pleat bottom fold is V-shaped. The thickness of the non-woven fabric corresponding to the first wrinkled area 101 is relatively large. When the wrinkles reach a predetermined maximum density, the first wrinkled areas 101 on the two groove surfaces of the V-shaped groove contact each other, and the flat area 102 located at the bottom of the V-shaped groove cannot effectively filter the air, but instead causes the effective filtering area of ​​the non-woven fabric to decrease; conversely, the first wrinkled area 101 is close to the pleat tip fold and far away from the pleat bottom fold. Based on the same pleat density, the flat area 102 can effectively filter the air.

[0041] like Figure 1 As shown, in another preferred embodiment, the one-way shrinkage air filtration nonwoven fabric further includes an activated carbon deodorizing layer 3, which is compositely arranged on the exhaust side of the fine filtration layer 2 to further eliminate air odor. The activated carbon deodorizing layer 3 can be an activated carbon nonwoven fabric.

[0042] like Figure 3 As shown, in another preferred embodiment, the fine filter layer 2 is provided with a second shrinkage zone 201, the second shrinkage zone 201 has heat-shrinkable folds extending along the second direction, and the first shrinkage zone 101 and the second shrinkage zone 201 are arranged opposite to each other along the thickness direction of the unidirectional shrinkage air filtration non-woven fabric.

[0043] The fine filter layer 2 is also provided with a second shrinkage area 201 , thereby increasing the effective filter areas of the pre-filter layer 1 and the fine filter layer 2 at the same time.

[0044] The production process of air filter non-woven fabric can be selected as: a two-layer composite structure of a rolled-shear heat-shrinkable non-woven fabric and a filter substrate layer 1a with heat-shrinkable non-woven fabric strips spaced apart from each other, a three-layer composite structure of a fine filter layer 2, a rolled-shear heat-shrinkable non-woven fabric and a filter substrate layer 1a, and finally a finished air filter non-woven fabric is obtained by heat treatment.

[0045] like Figure 4 As shown, the filter device of the embodiment is based on the unidirectional shrinkage air filter non-woven fabric of the above embodiment, the unidirectional shrinkage air filter non-woven fabric is a pleated structure composed of continuous V-shaped grooves, and the pre-filter layer 1 is the groove surface of the V-shaped groove; the bottom fold line 4 and the top fold line 5 of the V-shaped groove both extend along the second direction and are arranged in the flat area 102.

[0046] like Figure 5 As shown, in another preferred embodiment, in the groove surface of the same V-shaped groove, the interval between the groove bottom fold line 4 and the first wrinkle zone 101 is a first interval, and the interval between the groove top fold line 5 and the first wrinkle zone 101 is a second interval, and the first interval is greater than the second interval, that is, the first wrinkle zone 101 is close to the fold edge of the pleat tip and away from the fold edge of the pleat bottom. The first wrinkle zone 101 can further block the dust accumulated in the pre-filter layer 1 from accumulating at the bottom of the V-shaped groove, disperse the dust storage, and help improve the cleaning effect of pulse backblowing.

[0047] like Figure 4 , 5 As shown, in another preferred embodiment, the flattening area 102 is symmetrically arranged on both sides of the groove bottom fold line 4 and the groove top fold line 5, so that the groove surfaces of the pleated structure are evenly stressed.

[0048] like Figure 4 , 5 As shown, in another preferred embodiment, the V-shaped groove has a first groove surface 6 and a second groove surface 7 that are opposite to each other along the groove width direction, and the first wrinkled areas 101 of the first groove surface 6 and the second groove surface 7 are spaced apart along the groove width direction to ensure that the flat area 102 located in the V-shaped groove effectively filters the air.

[0049] 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. A unidirectional shrink air filtration nonwoven fabric, comprising: Pre-filter layer; A fine filter layer, fixedly and compositely arranged on the exhaust side of the pre-filter layer; It is characterized in that the pre-filter layer is alternately provided with first shrinkage areas and flat areas along a first direction, the first shrinkage areas have heat shrinkage wrinkles extending along a second direction, and the first direction and the second direction are perpendicular to each other.

2. The one-way shrink air filtration nonwoven fabric according to claim 1, characterized in that: The pre-filtration layer includes a filtration substrate layer and a heat-shrinkable non-woven fabric strip, wherein the heat-shrinkable non-woven fabric strip is sandwiched between the filtration substrate layer and the fine filtration layer; the heat-shrinkable non-woven fabric strip is arranged in the first shrinkage area; the heat-shrinkable non-woven fabric strip includes heat-shrinkable filaments and / or straight-laid heat-shrinkable fiber webs extending along the first direction, and straight-laid non-heat-shrinkable fiber webs extending along the second direction.

3. The one-way shrink air filtration nonwoven fabric according to claim 2, characterized in that: The filter substrate layer and the heat shrinkable nonwoven fabric strip are compounded by fiber entanglement.

4. The one-way shrink air filtration nonwoven fabric according to claim 1, characterized in that: The flattened area includes a first flattened area and a second flattened area. The width of the first flattened area along the first direction is greater than the width of the second flattened area. The first flattened area and the second flattened area are alternately arranged along the first direction.

5. The one-way shrink air filtration nonwoven fabric according to claim 1, characterized in that: It also includes an activated carbon deodorizing layer, which is compositely arranged on the exhaust side of the fine filtration layer.

6. The one-way shrink air filtration nonwoven fabric according to claim 1, characterized in that: The fine filter layer is provided with a second shrinkage zone, the second shrinkage zone has heat shrinkage wrinkles extending along a second direction, and the first shrinkage zone and the second shrinkage zone are arranged opposite to each other along the thickness direction of the unidirectional shrinkage air filter nonwoven fabric.

7. A filtering device, characterized in that: Based on the one-way shrinkage air filter non-woven fabric described in any one of claims 1 to 6, the one-way shrinkage air filter non-woven fabric is a pleated structure composed of continuous V-shaped grooves, and the pre-filtration layer is the groove surface of the V-shaped groove; the bottom fold line and the top fold line of the V-shaped groove both extend along the second direction and are arranged in the flat area.

8. The filtering device according to claim 7, characterized in that: In the groove surface of the same V-shaped groove, the interval between the groove bottom fold line and the first wrinkle zone is a first interval, the interval between the groove top fold line and the first wrinkle zone is a second interval, and the first interval is greater than the second interval.

9. The filtering device according to claim 7, characterized in that: The flattening area is symmetrically arranged on both sides of the groove bottom fold line and the groove top fold line.

10. The filtering device according to claim 7, characterized in that: The V-shaped groove has a first groove surface and a second groove surface that are opposite to each other along the groove width direction, and the first shrinkage areas of the first groove surface and the second groove surface are spaced apart along the groove width direction.

Images