Sandwich fabric with high strength

Abstract

The utility model relates to the field of composite fabrics, in particular to a sandwich fabric with high strength, which sequentially comprises a surface layer, a supporting layer and a bottom layer from top to bottom, the supporting layer comprises conical cavities and three-dimensional net-shaped fillers, the conical cavities are formed by three-dimensional twisting and weaving, the conical cavities are uniformly distributed on one surface of the supporting layer, and the three-dimensional net-shaped fillers are filled with the three-dimensional net-shaped fillers. And free yarns are reserved on the two surfaces of the supporting layer. The surface of the small opening supporting layer of the conical cavity is designed to be horizontal, after glue spraying, printing or roller coating is conducted, the conical structure can form a siphoning effect, fluid substances at the interface position are siphoned into the cavity from the small opening position, combination at the interface position is more stable after solidification, and the service life of the interface is prolonged. And the free yarns can be sealed in the solidified fluid substance, so that the strength of the fabric is further improved.

Description

Technical Field

[0001] This utility model relates to the field of composite fabrics, and more particularly to a sandwich fabric with high strength. Background Technology

[0002] Sandwich fabric is a synthetic material made of warp knitting, generally consisting of three layers: a top layer with a mesh design, a middle layer of monofilaments connecting the top and bottom layers, and a tightly woven flat bottom layer. It is commonly used in footwear, bags, home textiles, and other fields. As living standards improve, people have higher demands for fabrics. Currently, most sandwich fabrics on the market use a single connection method between the layers: the layers are formed solely through warp and weft knitting, which easily leads to delamination; or the layers are simply coated with adhesive, resulting in poor breathability and failing to meet higher consumer demands.

[0003] Chinese patent CN216193151U discloses a sandwich fabric with a three-dimensional effect. It uses a combination of transparent and colored yarns to weave a three-dimensional textured layer between the support layers. This textured layer runs through the top, support, and bottom layers, connecting the entire fabric and creating a good three-dimensional effect. However, the sandwich fabric layers are only connected by warp and weft knitting, and this single connection method reduces the bonding strength between the layers, making it prone to delamination and breakage with long-term use. Utility Model Content

[0004] Existing sandwich fabrics often use a single connection method between layers, resulting in drawbacks such as easy delamination and poor breathability. To address this issue, this invention provides a high-strength sandwich fabric. The high-strength sandwich fabric consists of a top layer, a support layer, and a bottom layer, arranged from top to bottom. The support layer includes a conical cavity and a three-dimensional mesh filling. The conical cavity is formed by three-dimensional twisting and is evenly distributed on one surface of the support layer. The small opening of the conical cavity is horizontal to the surface of the support layer, and free yarns are reserved on both surfaces of the support layer.

[0005] Specifically, the surface layer and the support layer are connected by woven bonding or interfacial bonding. Woven bonding is a connection formed by warp knitting or weft knitting of the free yarn and the fibers of the surface layer. Interfacial bonding is one of spray adhesive, printing, or roller coating. The spray adhesive, printing, or roller coating material contains PCM temperature-regulating material or nano aerogel, graphene, light-absorbing and heat-generating thermal insulation materials. The support layer and the bottom layer are connected by woven bonding, which is a connection formed by warp knitting or weft knitting of the free yarn and the fibers of the bottom layer.

[0006] Furthermore, the pore size of the three-dimensional mesh filling is 0.5~2mm. The appropriate porosity of the three-dimensional mesh filling can not only stably disperse the conical cavities, but also ensure that the fabric has sufficient strength and the required lightness.

[0007] This high-strength sandwich fabric can be used as a filling and support component in various household products, such as summer quilt cores, quilted mattresses, and fitted sheets, achieving multiple effects such as coolness, breathability, comfortable contact, and supportive resilience. The surface layer, support layer, and bottom layer of this invention are all woven from elastic yarns, with the material independently selected from one of cotton, polyester, PE fiber, nylon fiber, or PA fiber.

[0008] The beneficial effects of this utility model are as follows:

[0009] 1. The sandwich fabric of this utility model adopts a dual combination of weaving connection and interface bonding between the layers, which significantly improves the strength of the fabric. Specifically, on the one hand, the conical cavity is formed by three-dimensional twisting of yarn and free yarn is reserved. The yarn of the surface layer and the bottom layer are weft-knitted and connected with the free yarn of the conical cavity. On the other hand, the interlayer bonding is achieved by injecting adhesive material from the surface layer and the bottom layer into the conical cavity in the support layer. The dual combination of warp and weft knitting and bonding significantly improves the interlayer strength of the fabric. In addition, compared with other shapes such as cuboids, the mechanical properties of the conical cavity are more stable. When under pressure, it can evenly distribute stress and avoid local cracking, thereby extending the service life of the fabric.

[0010] 2. The surface of the small opening support layer of the conical cavity of this utility model is horizontal. After spraying, printing or roller coating, the conical structure can form a siphon effect, which siphons the fluid material at the interface into the cavity from the small opening. After solidification, the bonding at the interface is more stable, and the free yarn will also be sealed in the solidified fluid material, further improving the strength of the fabric. Attached Figure Description

[0011] Figure 1 This is a cross-sectional structural diagram of the fabric of this utility model.

[0012] Figure 2 This is a schematic diagram showing the distribution of the conical cavity on the surface of the support layer of this utility model.

[0013] The components are numbered as follows: 1. Surface layer, 2. Support layer, 21. Conical cavity, 22. Three-dimensional mesh filling, 3. Bottom layer. Detailed Implementation

[0014] The present invention will be described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Example 1

[0015] A high-strength sandwich fabric, such as Figure 1 and Figure 2As shown, the fabric consists of a top layer 1, a support layer 2, and a bottom layer 3, all woven from elastic PE fibers from top to bottom. The support layer 2 includes a conical cavity 21 and a three-dimensional mesh filling 22. The conical cavity 21 is formed by three-dimensional twisting and is evenly distributed on one surface of the support layer 2. The small opening of the conical cavity 21 is horizontal with the surface of the support layer 2. The aperture of the three-dimensional mesh filling 22 is 0.5 mm. Free yarns are reserved on both surfaces of the support layer 2. The top layer 1 and the support layer 2 are bonded by an interface bond, which is achieved by roller coating the surface of the support layer 2 with acrylic adhesive containing PCM temperature-regulating material. The support layer 2 and the bottom layer 3 are connected by a woven connection, which is formed by warp knitting or weft knitting of the free yarns and the fibers of the bottom layer 3. Example 2

[0016] A high-strength sandwich fabric, comprising, from top to bottom, a top layer 1, a support layer 2, and a bottom layer 3, all three layers are made of elastic nylon fiber. Conical cavities 21 are distributed on both the upper and lower surfaces of the support layer 2. A three-dimensional mesh filling 22 is formed between the conical cavities 21 by yarn weaving. The mesh openings of the three-dimensional mesh filling 22 are hexagonal, with each opening diameter ranging from 2mm. The top layer 1 and support layer 2, and the support layer 2 and bottom layer 3 are connected through a double-linking method: firstly, free yarns are reserved after the conical cavities 21 are three-dimensionally twisted and woven, and the yarns of the top layer 1 and bottom layer 3 are weft-knitted together with the free yarns of the conical cavities 21; secondly, adhesive material is injected from the top layer 1 and bottom layer 3 into the conical cavities 21 of the support layer 2 to bond the interlayer surfaces. Conical cavities 21 are evenly distributed between the support layers 2. The conical cavities 21 contain adhesive material and a small amount of air, with a porosity of 10%-40%, which facilitates the formation of a stable heat insulation layer inside the conical cavities 21.

[0017] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sandwich fabric having high strength, characterized by, The high-strength sandwich fabric is sequentially provided with a surface layer (1), a supporting layer (2) and a bottom layer (3) from top to bottom, the supporting layer (2) comprises a conical cavity (21) and a three-dimensional reticular filling (22), the conical cavity (21) is formed by three-dimensional braiding, the conical cavities (21) are uniformly distributed on one surface of the supporting layer (2), the small opening of the conical cavity (21) is horizontal to the surface of the supporting layer (2), and the two surfaces of the supporting layer (2) are reserved with free yarns.

2. The sandwich fabric with high strength according to claim 1, wherein, The surface layer (1) and the supporting layer (2) are connected by weaving or are adhered by interface bonding, the weaving connection is formed by warp knitting or weft knitting of the free yarns and the fibers of the surface layer (1), the interface bonding is one of glue spraying, printing or roller coating, and the supporting layer (2) and the bottom layer (3) are connected by weaving, the weaving connection is formed by warp knitting or weft knitting of the free yarns and the fibers of the bottom layer (3).

3. The sandwich fabric with high strength according to claim 2, characterized by, The pore size of the three-dimensional reticular filling (22) is 0.5-2 mm.

4. The sandwich fabric with high strength according to claim 2, wherein, The surface layer (1), the supporting layer (2) and the bottom layer (3) are all woven by elastic yarns.

5. The sandwich fabric with high strength according to claim 4, wherein, The elastic yarns are one of cotton, polyester, PE fiber, nylon fiber and PA fiber.

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