A composite folded nonwoven fabric

Abstract

This utility model discloses a composite folded nonwoven fabric, including a nonwoven fabric body. The body has a main folding groove and multiple creases symmetrically arranged on its upper and lower surfaces. The main folding groove and creases are all located on the surface layer. The body is composed of a central layer, an adhesive layer, and a surface layer. The central layer is a polyester fiber layer, the adhesive layer is a glass fiber layer, and the surface layer is a PET or PP nonwoven fabric. A glass fiber-polyester fiber composite layer is provided in the adhesive layer near the folding area of ​​the main folding groove. An acrylic or silicone pressure-sensitive adhesive coating is provided on the outer surface of the main folding groove. 0.1-0.3mm micro-perforations are opened on the glass fiber of the adhesive layer. This utility model solves the problems of existing nonwoven fabrics easily slipping out of the mounting frame due to elastic recovery after folding and low tear resistance. It achieves precise folding and positioning through the main folding groove and creases. The composite layer and the materials of each layer work together to improve strength. The adhesive coating prevents rebound after folding. The micro-perforations ensure air permeability. It is suitable for filter cartridges and other applications.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabric technology, specifically to a composite folded nonwoven fabric. Background Technology

[0002] Non-woven fabric, also known as non-woven cloth, is composed of oriented or randomly arranged fibers. It is called cloth because it resembles the appearance and some properties of fabric. As an excellent filter material, non-woven fabric is commonly used in filter elements. To increase the filtration area, non-woven fabric is often folded. Because non-woven fabric is usually made of polymer fibers, it exhibits relatively soft and smooth properties macroscopically. However, microscopically, the fibers have strong elasticity, requiring significant pressure to create creases and induce plastic deformation at the crease. Insufficient plastic deformation at the crease makes it difficult to maintain stability during installation within the mounting frame. The non-woven fabric can easily slip out of the frame due to elastic recovery, making the installation of non-woven fabric in automotive air conditioning filters more troublesome. Furthermore, existing non-woven fabrics lack warp and weft threads, resulting in low tear resistance and easy tearing. Therefore, we propose a folded non-woven fabric method. Utility Model Content

[0003] The purpose of this invention is to solve the problems existing in the background art and provide a composite folded nonwoven fabric.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a composite folded nonwoven fabric, comprising a nonwoven fabric body, wherein the upper and lower sides of the nonwoven fabric body are symmetrically provided with main folding grooves and distributed with multiple creases, the nonwoven fabric body includes a central layer, the upper and lower sides of the central layer are compositely connected with adhesive layers, one side of the adhesive layer is compositely connected with a surface layer, the main folding grooves and the creases are all formed on the surface layer, a composite layer is provided in the adhesive layer near the folding area of ​​the upper and lower two main folding grooves, and an adhesive coating is added to the outer groove surface of the main folding groove.

[0005] Furthermore, the central layer is a polyester fiber layer.

[0006] Furthermore, the adhesive layer is a glass fiber layer.

[0007] Furthermore, the composite layer is a glass fiber-polyester fiber composite layer, and the ratio of the two fibers is 60% glass fiber + 40% polyester fiber.

[0008] Furthermore, uniformly distributed micropores with a diameter of 0.1-0.3 mm are formed on the glass fiber of the adhesive layer.

[0009] Furthermore, the adhesive coating is made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive.

[0010] Furthermore, the surface layer is PET nonwoven fabric or PP nonwoven fabric.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] By symmetrically setting the main folding grooves and multiple folds on the surface layer, clear guidance and positioning are provided for folding, making the folding process smoother and allowing for precise control of the folded shape, ensuring consistency and facilitating installation within the mounting frame. In the folding area near the main folding grooves, a glass fiber-polyester composite layer is added to the adhesive layer, utilizing the high strength of glass fiber and the flexibility of polyester fiber to further enhance overall strength. The adhesive coating added to the outer surface of the main folding grooves allows for rapid bonding and fixation of the folded structure after folding, effectively preventing springback and ensuring the stability of the folded shape. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0015] In the diagram: 1-Non-woven fabric body, 2-Main fold groove, 3-Fold, 4-Center layer, 5-Adhesive layer, 6-Surface layer, 7-Composite layer, 8-Adhesive coating layer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Combination Figures 1 to 2The composite folded nonwoven fabric shown includes a nonwoven fabric body 1. The upper and lower sides of the nonwoven fabric body 1 are symmetrically provided with main folding grooves 2 and multiple fold lines 3. The nonwoven fabric body 1 includes a central layer 4. The upper and lower sides of the central layer 4 are compositely connected with adhesive layers 5. One side of the adhesive layer 5 is compositely connected with a surface layer 6. The main folding grooves 2 and fold lines 3 are both opened on the surface layer 6. A composite layer 7 is provided in the adhesive layer 5 near the folding area of ​​the upper and lower main folding grooves 2. An adhesive coating layer 8 is added to the outer groove surface of the main folding grooves 2.

[0019] The core layer 4 is a polyester fiber layer, in which polyester fiber has excellent tear resistance, wear resistance and chemical stability, moderate flexibility and easy to combine with other materials; the adhesive layer 5 is a glass fiber layer, in which glass fiber and polyester fiber layer form a synergistic reinforcement effect, further improving the overall strength.

[0020] Composite layer 7 is made of glass fiber and polyester fiber, with a ratio of 60% glass fiber and 40% polyester fiber. This reduces the overall hardness while maintaining high strength, and improves the flexibility and fit of the nonwoven fabric.

[0021] Uniformly distributed micropores with a diameter of 0.1-0.3 mm are opened on the glass fiber of the adhesive layer 5 to reduce obstruction to airflow; at the same time, a highly permeable polyester fiber layer (such as polyester cloth with a larger pore size) can be selected to ensure the gas flow efficiency in the multi-layer structure, which is especially suitable for use as a filter material.

[0022] Considering the application scenarios of the folded nonwoven fabric in this utility model (such as filter cartridges, structures that need to be folded and fixed), the adhesive coating 8 is set as a micro-adhesive coating, which needs to meet the requirements of moderate adhesion, repeated bonding, no glue residue, good compatibility with the nonwoven fabric surface layer (without affecting its foldability and breathability), and can also help fix the folded state to prevent rebound. Therefore, the adhesive coating 8 can be made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive. After folding, it can be temporarily fixed by light pressure to further prevent rebound, and it does not affect the unfolding again. It can be repeatedly bonded.

[0023] The surface layer 6 is made of PET or PP nonwoven fabric. PET / PP is the mainstream raw material for nonwoven fabrics. The composite process of PET / PP with the middle layer 4 (polyester) and the adhesive layer 5 (glass fiber) is mature (such as spunlace and hot rolling).

[0024] Working principle: The main fold groove 2 and multiple fold lines 3 on the surface layer 6 serve as physical guide structures, directly providing the folding direction and position of the nonwoven fabric. The added micro-fold lines 3 are auxiliary fold lines, allowing users to select the folding position according to their needs without affecting the stability of the main fold groove 2.

[0025] The core layer 4, made of polyester fiber, serves as the core skeleton, providing basic tear resistance and abrasion resistance. The upper and lower adhesive layers 5, made of glass fiber, utilize their high strength to achieve a strong interlayer composite, ensuring the overall structural stability. In the folded area near the main fold groove 2, the glass fiber-polyester fiber composite layer in the adhesive layer 5 in this area, through the synergistic effect of the two fibers, is not prone to springback after folding, allowing the nonwoven fabric to maintain its folded state well and facilitating its installation.

[0026] After the nonwoven fabric is folded along the main fold groove 2, the adhesive coating 8 on the outer surface of the main fold groove 2 comes into contact with the corresponding folded surface. The folded structure is quickly fixed by the adhesiveness of the pressure-sensitive adhesive, so that the folded shape remains stable.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite folded nonwoven fabric, comprising a nonwoven fabric body (1), characterized in that: The nonwoven fabric body (1) has main folding grooves (2) symmetrically arranged on the upper and lower sides, and multiple fold lines (3) distributed thereon. The nonwoven fabric body (1) includes a central layer (4). The upper and lower sides of the central layer (4) are connected with adhesive layers (5). One side of the adhesive layer (5) is connected with a surface layer (6). The main folding grooves (2) and the fold lines (3) are both opened on the surface layer (6). A composite layer (7) is provided in the adhesive layer (5) near the folding area of ​​the upper and lower two main folding grooves (2). An adhesive coating layer (8) is added to the outer groove surface of the main folding groove (2).

2. The composite folded nonwoven fabric according to claim 1, characterized in that: The central layer (4) is a polyester fiber layer.

3. The composite folded nonwoven fabric according to claim 1, characterized in that: The adhesive layer (5) is a glass fiber layer.

4. The composite folded nonwoven fabric according to claim 1, characterized in that: The composite layer (7) is a glass fiber-polyester fiber composite layer.

5. The composite folded nonwoven fabric according to claim 3, characterized in that: Uniformly distributed micro-holes with a diameter of 0.1-0.3 mm are formed on the glass fiber of the adhesive layer (5).

6. The composite folded nonwoven fabric according to claim 1, characterized in that: The adhesive coating (8) is made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive.

7. The composite folded nonwoven fabric according to claim 1, characterized in that: The surface layer (6) is PET nonwoven fabric or PP nonwoven fabric.

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