CN221737310U - Composite layer and skin combination layer - Google Patents

Abstract

The utility model discloses a composite layer and a skin combination layer for being arranged between the skin and the frame of an automobile. The composite layer for being arranged between the skin and the frame of an automobile comprises: a soft foam layer with a density of 40 to 60 kg/m ³ , a first non-woven fabric layer with a gram weight of 30 to 80 g/m ² , and a second non-woven fabric layer with a gram weight of 30 to 80 g/m ² , the soft foam layer sequentially having a first surface and a second surface relative to each other along a first direction; the first non-woven fabric layer is bonded and fixed to the first surface; the second non-woven fabric layer is bonded and fixed to the second surface. The skin combination layer comprises a skin and a composite layer, and the skin and the composite layer are arranged along the first direction. The composite layer and the skin combination layer of the utility model have a soft feel, good resilience, are lightweight and have low processing difficulty, and have a higher cost performance.

Description

Composite layer and skin combination layer

Technical Field

The utility model relates to the technical field of automobile interior decoration, in particular to a composite layer between an automobile skin and a frame and a skin combination layer.

Background Art

With the development of the automotive industry and the continuous improvement of consumers' demand for experience, "perceived quality" has gradually replaced basic needs such as fuel efficiency and durability, becoming an important factor affecting consumers' car purchases, and has been increasingly concerned by major automobile companies. Especially for automotive interior materials, the information conveyed by interior materials that people receive through their senses gives them a perceived quality cognition centered on customer satisfaction.

At present, the mainstream materials used in the field of automotive interior technology for composite between the skin and the frame include: 1) 3D mesh materials. The use of 3D mesh materials can make the interior feel very soft and have good resilience; 2) foam materials, such as polyurethane foam, polypropylene foam, and polyethylene foam. The price of use is lower than that of 3D mesh materials.

However, the above-mentioned mainstream materials also have certain corresponding problems: 3D mesh materials are expensive, the peeling force between the skeleton and the foam is relatively low, the processing is difficult, and there are high requirements for the amount of glue sprayed and the uniformity of glue sprayed; and the resilience of foam materials is relatively poor compared with 3D mesh materials, and the feel is not as good as 3D mesh materials. It is easy to have appearance defects such as pits and bulges, which cannot meet the requirements of interior materials.

Utility Model Content

In order to solve the above technical problems, the utility model provides a composite layer used between the automobile skin and the frame, which includes: a soft foam layer with a density of 40 to 60 kg/ ^m3 , a first non-woven fabric layer with a gram weight of 30 to 80 g/ ^m2 and a second non-woven fabric layer with a gram weight of 30 to 80 g/ ^m2 in sequence along a first direction, the soft foam layer has a first surface and a second surface relative to each other in sequence along the first direction, the first non-woven fabric layer is bonded and fixed to the first surface, and the second non-woven fabric layer is bonded and fixed to the second surface.

By adopting the above technical scheme, the composite layer provided by the present invention adopts a soft foam layer, which can provide a soft feel and resilience, and can form a large deformation effect after the action of force. The first non-woven fabric layer and the second non-woven fabric layer are respectively attached and fixed to the first surface and the second surface of the soft foam layer, and the first non-woven fabric layer is located close to the skin side, so that when the soft foam layer is deformed under the action of force, the first non-woven fabric layer mainly promotes the recovery of the strain of the soft foam layer, achieves a high elastic effect, and promotes the improvement of the resilience of the composite layer structure of the utility model; and the second non-woven fabric layer is located close to the skeleton side, mainly used for concealing blemishes, preventing skeleton defects from affecting the appearance, providing better peeling force between the skeleton and the soft foam layer, and also providing a certain resilience. Thereby achieving that the composite layer provided by the utility model has a delicate and soft feel, good resilience, a high peeling force between the skeleton and the foam, and a high cost performance.

Optionally, the soft foam layer is one of polyurethane foam material, polypropylene foam material, polyethylene foam material, ethylene-vinyl acetate copolymer foam material, and ethylene propylene diene monomer rubber foam material.

Optionally, the first nonwoven fabric layer and the second nonwoven fabric layer are each independently selected from one of the following: spunlace nonwoven fabric, needle-punched nonwoven fabric, heat-bonded nonwoven fabric, pulp air-laid nonwoven fabric, wet-laid nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric or stitchbonded nonwoven fabric.

Optionally, the first non-woven fabric layer and the soft foam layer are bonded by glue or flame compounding, and the second non-woven fabric layer and the soft foam layer are bonded by glue or flame compounding.

The utility model also provides a skin combination layer, comprising a skin and the composite layer, wherein the skin and the composite layer are arranged along the first direction, and the skin along the first direction is sequentially: a coating layer, a polymer dense layer, a foaming adhesive layer and a textile substrate, wherein the textile substrate is adhered and fixed to the surface of the first non-woven fabric layer.

By adopting the above technical solution, the combination of the skin and the composite layer further enhances the feel and resilience of the skin composite layer, thereby improving customer satisfaction when used in automotive interiors.

Optionally, the thickness of the finishing agent layer is 100 nm to 8 μm, the thickness of the polymer dense layer is 45 to 55 μm, and the thickness of the foaming adhesive layer is 150 to 250 μm.

Optionally, the finishing agent layer is a transparent film.

Optionally, the polymer dense layer is one of polyvinyl chloride, polyurethane, polyolefin thermoplastic elastomer, and silicone.

Optionally, the foamed adhesive layer is one of polyvinyl chloride foam material, polyurethane foam material, polyolefin thermoplastic elastomer foam material, and silicone foam material.

The skin composite layer provided by the utility model also includes: a film barrier layer, the skin, the composite layer and the film barrier layer are arranged in sequence along the first direction, and the film barrier layer is adhered and fixed to the surface of the second non-woven fabric layer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic cross-sectional view of a composite layer of the present invention.

FIG2 is a schematic cross-sectional view of the skin composite layer of the present invention.

FIG. 3A is a stress-strain curve diagram in the longitudinal direction of Example 2 of the present invention.

FIG3B is a stress-strain curve diagram in the weft direction of Example 2 of the present invention and stress-strain curve diagrams in the warp direction and weft direction of Comparative Examples 1 and 2. ...

Structural symbol description:

1 First non-woven layer

2 Second non-woven layer

3 Soft foam layer

4 Textile substrate

5 Foam adhesive layer

6 Polymer dense layer

7 Coating layer

8 Film barrier layer

31 First Surface

32 Second Surface

X first direction

DETAILED DESCRIPTION

The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

In the description of this embodiment, it should be noted that, unless otherwise defined, the "non-woven fabric layer" used herein refers to the general term for the first non-woven fabric layer and the second non-woven fabric layer; the "skin" used herein is used to describe artificial leather or leather in the field of automotive interior decoration; the "soft foam layer" used herein is used to describe a foam layer with an elastic modulus of less than 68.6MPa under a standard environment of 23°C and a relative humidity of 50%. Other technical terms or scientific terms used in this utility model should be the common meanings understood by people with general skills in the field to which this utility model belongs.

In order to facilitate the understanding of the technical solution of the present utility model, the technical problem to be solved by the present utility model is first described.

In the existing automotive interior material technology field, the mainstream materials used in the composite between the skin and the frame are difficult to achieve good performance, high cost performance and low processing requirements. For example, the mainstream 3D mesh material is a three-dimensional fabric, and the glue easily penetrates and affects its resilience. At the same time, the main contribution to the peeling force of the frame and the foam layer comes from the bonding ability of the materials between the frame and the foam layer. When the bonded material is 3D mesh, because 3D mesh is a three-dimensional structure, the actual bonding area is the vertex of the three-dimensional structure, that is, the bonding of points and surfaces; when the bonded material is non-woven fabric, the bonding area is the surface of the non-woven fabric, that is, the bonding of surfaces. Obviously, the bonding area of non-woven fabric with the frame is larger than that of 3D mesh, so the peeling force will be greater. In addition, the material of the foam layer single-sided composite non-woven fabric has poor resilience. Since one side of the composite non-woven fabric will be composited with the frame, the non-woven fabric only increases the bonding force of the frame and covers the defects of the frame. When subjected to force, only the foam layer plays a rebound role, and the non-woven fabric does not contribute to the resilience, so the resilience is poor. In view of the above problems, the utility model provides a composite layer with good performance, high cost performance and low processing requirements for the automotive skin and the skeleton. The composite layer of the utility model has better feel and resilience, and the peeling force between the skeleton and the soft foam layer is higher than that of 3D mesh. The price is cheaper than 3D mesh, which is expected to be 8￥/㎡ cheaper. It is also lighter than 3D mesh, and the materials contained in the composite layer have a wide adjustment range and are better adaptable to highly automated equipment. The composite layer provided by the utility model is suitable for areas such as dashboards, doors, and central armrests in automotive interiors.

The technical solution of the utility model is further described below in conjunction with the accompanying drawings and through specific implementation methods. Those skilled in the art should understand that the embodiments are only to help understand the utility model and should not be regarded as specific limitations of the utility model.

As shown in FIG1 , this embodiment provides a composite layer for being arranged between a car skin and a frame, comprising: a soft foam layer 3 having a first surface 31 and a second surface 32 in sequence along a first direction. The first direction is, for example, the X direction in FIG1 and FIG2 . A first non-woven fabric layer 1 is bonded and fixed to the first surface 31, and a second non-woven fabric layer 2 is bonded and fixed to the second surface 32.

The utility model adopts a soft foam layer 3 to provide a soft feel and resilience, and a large deformation effect can be formed after the action of force. The soft foam layer is located between the first non-woven fabric layer 1 and the second non-woven fabric layer 2. The first non-woven fabric layer 1 is located close to the skin side. When the soft foam layer is deformed due to the action of force, since the non-woven fabric layer has a low elongation and a high elastic modulus, the first non-woven fabric layer 1 mainly provides a tensile force to promote the deformation recovery of the soft foam layer, so as to achieve a high resilience effect, avoid the appearance defects such as pits and bulges, and enhance the feel; and the second non-woven fabric layer 2 is located close to the skeleton side, mainly used for concealing blemishes, preventing skeleton defects from affecting the appearance, providing a better peeling force between the skeleton and the soft foam layer 3, and also providing a certain resilience. In this embodiment, the first non-woven fabric layer 1 and the second non-woven fabric layer 2 can be made of the same material.

The composite layer provided in this embodiment has a delicate and soft feel, good resilience, a high peeling force between the skeleton and the soft foam layer 3, and a high cost-effectiveness. In the present utility model, resilience can be understood as the ability of an object to deform under the action of a force and to produce a physical change of a restored or nearly restored state when the force is released. Regarding the resilience of the composite layer of this embodiment, the resilience of the soft foam layer 3 accounts for about 31% of the overall resilience of the composite layer, and the part of the non-woven fabric layer that promotes the improvement of resilience accounts for about 69%.

The selection of materials for each layer in the composite layer can be determined according to the material requirements of the processing process. The soft foam layer 3 is, for example, one of polyurethane foam material, polypropylene foam material, polyethylene foam material, ethylene-vinyl acetate copolymer foam material, and EPDM rubber foam material.

Preferably, the soft foam layer 3 in this embodiment is a polyurethane foam material. The soft polyurethane foam material has better resilience and mechanical properties, thereby better achieving the effect of forming a larger deformation after the action of force.

Furthermore, the density of the soft foam layer 3 in the above embodiment is 40-60 kg/m ³ , so that the soft foam layer 3 has a honeycomb or porous structure. The density is further 50 kg/m ³ . When the density of the foaming material is 50 kg/m ³ , the foaming ratio is calculated to be between 22.2 and 24.8 times, which is equivalent to the mass of almost all air, thereby achieving the lightweight of the soft foam layer 3; at the same time, the soft foam layer 3 obtained at the above density has a better feel. In addition, the pore size of the soft foam layer is ≥ 0.1 μm.

The non-woven fabric layer is, for example, one or more of polypropylene, polyethylene terephthalate non-woven fabric, polyamide non-woven fabric, viscose fiber non-woven fabric, acrylic non-woven fabric, HDPE non-woven fabric, and spandex non-woven fabric, among which it is preferably made of polyethylene terephthalate. Polyethylene terephthalate non-woven fabric has strong tensile resistance, tear resistance and aging resistance, low cost and easy processing.

In the above embodiments, the first non-woven fabric layer 1 and the second non-woven fabric layer 2 have a gram weight of 30-80 g/m ² , preferably 30-50 g/m ² . This range allows the non-woven fabric layer to have good concealing ability and mechanical properties at a suitable cost, good hand feel, high cost performance, and can also play a role in isolating glue.

Furthermore, the first nonwoven fabric layer 1 and the second nonwoven fabric layer 2 can each be independently selected from one of the following: spunlace nonwoven fabric, needle-punched nonwoven fabric, heat-bonded nonwoven fabric, pulp air-laid nonwoven fabric, wet-laid nonwoven fabric, spunbonded nonwoven fabric, meltblown nonwoven fabric or stitchbonded nonwoven fabric.

Spunlace nonwoven fabrics are made by spraying high-pressure fine water jets onto one or more layers of fiber webs, which entangle the fibers with each other, thereby reinforcing the fiber webs and giving them a certain strength. Spunlace nonwoven fabrics are soft to the touch and have strong mechanical strength. The common weight is below 80 grams.

Needle-punched nonwoven fabrics are made of polyester, polyester and polypropylene, and are made through multiple needle punching and appropriate heat pressing. Needle-punched nonwoven fabrics have a full and fluffy feel and are generally heavier in weight.

Heat-bonded nonwoven fabrics are made by adding fibrous or powdery hot-melt bonding reinforcement materials to the fiber web, which is then heated, melted, cooled and reinforced into cloth. The surface is usually smooth and relatively fluffy, the production process is simple, the production efficiency is high and the cost is low.

Pulp air-laid non-woven fabric uses air-laid technology to open wood pulp fiberboard into single fiber state, and then uses air flow method to make the fiber agglomerate on the mesh curtain, and then the fiber mesh is reinforced into cloth. Pulp air-laid non-woven fabric has good fluffiness, soft feel and low cost.

Wet-laid nonwoven fabrics are made by opening fiber raw materials placed in a water medium into single fibers, and mixing different fiber raw materials to make fiber suspension slurry. The suspension slurry is transported to a web-forming mechanism, and the fibers are formed into a web in a wet state and then reinforced into a cloth. Wet-laid nonwoven fabrics have a smooth surface, small vertical and horizontal strength differences, and balanced tensile strength.

Spunbond nonwoven fabrics are made by extruding and stretching polymers to form continuous filaments, which are then laid into a web. The web is then bonded, thermally bonded, chemically bonded or mechanically reinforced to become a nonwoven fabric. Therefore, spunbond nonwoven fabrics have good high temperature resistance, low temperature resistance, high elongation and good stability.

Meltblown nonwoven fabrics are made by feeding polymers, melting and extruding them to form fibers, cooling the fibers into a web, and finally reinforcing them into fabrics. Meltblown nonwoven fabrics are soft and comfortable to the touch, have many gaps, good solid barrier properties, a fluffy structure, and good wrinkle resistance.

Stitchbonded nonwoven fabrics use warp knitted coil structures to reinforce webs, yarn layers, nonwoven materials or their combinations to make nonwoven fabrics. Meltblown nonwoven fabrics have high strength, good elasticity and wear resistance.

In the above embodiments, the first non-woven fabric layer 1 and the second non-woven fabric layer 2 are both spunlace non-woven fabrics. In comparison, spunlace non-woven fabrics have a delicate and soft feel, better resilience, are lightweight, have strong mechanical strength, and better concealment ability, and are more conducive to improving the resilience and feel of the composite layer, improving the simplicity of the process, and reducing the difficulty of processing.

Optionally, the first non-woven fabric layer 1 and the soft foam layer 3 are bonded by glue, that is, there is a glue layer between the first non-woven fabric layer 1 and the soft foam layer 3, or flame bonding is used between the first non-woven fabric layer 1 and the soft foam layer 3. Flame bonding is an existing known process, which uses a burning method to bond and fix the first non-woven fabric layer and the soft foam layer. The second non-woven fabric layer 2 and the soft foam layer 3 are bonded by glue, that is, there is a glue layer between the second non-woven fabric layer 2 and the soft foam layer 3, or flame bonding is used between the second non-woven fabric layer 2 and the soft foam layer 3.

The utility model also provides a skin combination layer, including a skin and a composite layer arranged in sequence along a first direction. As shown in FIG2 , the skin is sequentially arranged along the first direction: a coating layer 7, a polymer dense layer 6, a foaming adhesive layer 5 and a textile substrate 4, wherein the textile substrate 4 is bonded and fixed to the surface of the first non-woven fabric layer 1, for example, in FIG2 , the textile substrate 4 is bonded and fixed to the upper surface of the first non-woven fabric layer 1.

The skin of the utility model is composed of a coating layer 7, a polymer dense layer 6, a foaming adhesive layer 5 and a textile substrate 4. The coating layer 7 is composed of silane-modified water-based polyurethane resin, matting powder, additives, cross-linking agents, etc. It mainly serves as a protective layer and also provides certain wear resistance and hand feel. The polymer dense layer 6 can be, for example, polyvinyl chloride, polyurethane, polyolefin thermoplastic elastomer or silicone material. It mainly serves as an appearance layer, providing patterns and designs, which can be obtained from the polymer dense layer 6 material through a template method or added by printing. The foaming adhesive layer 5 is a foaming material, which has adhesiveness itself, for example, it can be a polyvinyl chloride foaming material, a polyurethane foaming material, a polyolefin thermoplastic elastomer foaming material or a silicone foaming material. The foaming adhesive layer 5 mainly imitates the feel of leather and provides cushioning and resilience. The textile substrate 4 is a fabric layer, which is mainly composed of polyester materials, such as polyethylene terephthalate. The textile substrate 4 can serve as the load-bearing part of the skin, provide mechanical properties, increase mechanical, tearing and breaking strength, and improve support and feel.

The finishing agent layer 7 is formed by coating the polymer dense layer 6. The polymer dense layer 6 and the foam adhesive layer 5 are bonded and fixed by the principle of similar dissolution because they have similar or identical polymer materials. The foam adhesive layer 5 is directly bonded and fixed to the textile substrate 4 because it has adhesiveness. There is a glue layer between the textile substrate 4 and the first non-woven fabric layer 1. In addition, the combination of the composite layer and the skin further improves the feel and resilience of the skin.

Optionally, the thickness of the finishing agent layer 7 is 100 nm to 8 μm.

Optionally, the coating agent layer 7 is a transparent film, which can show the prints or patterns on the polymer dense layer, and can also serve as a protective layer for the polymer dense layer 6, while also providing certain wear resistance and hand feel.

Furthermore, the dense polymer layer 6 is one of polyvinyl chloride, polyurethane, polyolefin thermoplastic elastomer, and silicone. Compared with the foaming adhesive layer 5, the dense polymer layer refers to a layer that is not foamed during the preparation process.

Optionally, the thickness of the polymer dense layer 6 is 45-55 μm, thereby presenting more intuitive patterns and patterns, while improving the texture of the skin. Preferably, the thickness of the polymer dense layer 6 is 50 μm. In addition, the pore size of the polymer dense layer 6 is ≤ 0.23 nm.

Furthermore, the foamed adhesive layer 5 is one of polyvinyl chloride foam material, polyurethane foam material, polyolefin thermoplastic elastomer foam material, and silicone foam material.

Optionally, the thickness of the foaming adhesive layer 5 is 150-250 μm. The thickness affects the feel of the foaming adhesive layer, and the above thickness range can achieve a soft and delicate feel. Preferably, the thickness of the foaming adhesive layer 5 is 200 μm. In addition, the pore size of the foaming adhesive layer 5 is ≥50 μm.

Optionally, there is a glue layer between the woven fabric substrate 4 and the first non-woven fabric layer 1 .

The skin composite layer provided by the utility model also includes: a thin film barrier layer 8. The skin, the composite layer and the thin film barrier layer 8 are arranged in sequence along the first direction. The thin film barrier layer 8 is adhered and fixed to the surface of the second non-woven fabric layer 2, for example, the lower surface of the second non-woven fabric layer 2 in Figure 2. The thin film barrier layer 8 is composed of an aqueous resin, an auxiliary agent and a cross-linking agent, and is formed into a film by coating on the surface of the second non-woven fabric layer 2. The thin film barrier layer 8 is located between the second non-woven fabric layer 2 and the skeleton. The skeleton is, for example, located below the thin film barrier layer 8 in Figure 2, and there is a glue layer between the thin film barrier layer 8 and the skeleton. The thin film barrier layer 8 is mainly used to prevent glue from leaking into the soft foam layer 3 and thus affecting the product performance; however, if the second non-woven fabric layer 2 can completely block the leakage of the glue, there is no need to set the thin film barrier layer 8.

Embodiment 1:

A soft foam layer 3 with a thickness of 4 mm and a density of 50 kg/m ³ was selected. The first surface 31 and the second surface 32 of the soft foam layer 3 were burned with a flame, and then they were bonded and fixed to the first non-woven fabric layer 1 and the second non-woven fabric layer 2 with a gram weight of 40 g/m ^2, respectively, to obtain a composite layer of the soft foam layer 3 and the double-sided composite non-woven fabric layer, and the overall material thickness was 3 mm. Among them, the soft foam layer 3 is a soft polyurethane foam, and the first non-woven fabric layer 1 and the second non-woven fabric layer 2 are both spunlace non-woven fabrics made of polyethylene terephthalate. The mechanical performance parameters are detailed in Table 1.

Embodiment 2:

A soft foam layer 3 with a thickness of 3 mm and a density of 55 kg/m ³ was selected. The first surface 31 and the second surface 32 of the soft foam layer 3 were coated with glue, and then they were bonded and fixed to the first non-woven fabric layer 1 and the second non-woven fabric layer 2 with a gram weight of 40 g/m ^2, respectively, to obtain a composite layer of the soft foam layer 3 and the double-sided composite non-woven fabric layer, and the overall material thickness was 3 mm. Among them, the soft foam layer 3 is a soft polyurethane foam, and the first non-woven fabric layer 1 and the second non-woven fabric layer 2 are both spunlace non-woven fabrics made of polyethylene terephthalate. The hardness and elastic modulus parameters are detailed in Table 2.

Comparative Example 1:

A 3D mesh with a thickness of 3 mm produced by the Muller manufacturer purchased on the market was selected. Its mechanical performance parameters, hardness and elastic modulus parameters are shown in Tables 1 and 2.

Comparative Example 2:

A soft foam layer 3 with a thickness of 3 mm and a density of 55 kg/m ³ was selected, and the second surface 32 of the soft foam layer 3 was coated with glue, and then bonded and fixed with the second non-woven fabric layer 2 with a gram weight of 40 g/m ² to obtain a composite layer in which the soft foam layer 3 was composited with the second non-woven fabric layer 2 on one side, and the overall material thickness was 3 mm. Among them, the soft foam layer 3 was soft polyurethane foam, and the second non-woven fabric layer 2 was a spunlace non-woven fabric composed of polyethylene terephthalate. The hardness and elastic modulus parameters are detailed in Table 2.

To facilitate the understanding of the present invention, the parameter testing method in the present invention is described as follows:

The test of breaking strength and elongation refers to BDS13784-1976 artificial leather synthesis to determine the tensile strength and elongation at break; the test of tear strength refers to QB/T 2711-2005 Leather-Physical and mechanical tests-Determination of tear load-Double edge tear (Leather. Physical and mechanical tests. Determination of tear force: Double edge tear); the hardness test refers to GB/T 10807-2006 Determination of hardness in soft foam polymer materials (indentation method); the test of elastic modulus refers to BDS13784-1976 artificial leather synthesis to determine the tensile strength and elongation at break; the test of stress-strain curve refers to BDS13784-1976 artificial leather synthesis to determine the tensile strength and elongation at break.

As shown in FIG3 , the stress-strain curves in the warp and weft directions of Example 2, Comparative Example 1 and Comparative Example 2 are shown. In FIG3A , 1 is the stress-strain curve in the warp direction of Example 2; in FIG3B , 2 is the stress-strain curve in the weft direction of Example 2, 3 is the stress-strain curve in the warp direction of Comparative Example 2, 4 is the stress-strain curve in the weft direction of Comparative Example 2, 5 is the stress-strain curve in the warp direction of Comparative Example 1, and 6 is the stress-strain curve in the weft direction of Comparative Example 1. Among them, under the same displacement, the different forces used can show the good or bad hand feel; under the same applied force, the easier the rebound difficulty, the better. As can be seen from FIG3 , under the same displacement, the forces used in Example 2 in the warp and weft directions are slightly greater than those in Comparative Example 1 and Comparative Example 2; under the same applied force, the displacements generated in Example 2 in the warp and weft directions are slightly smaller than those in Comparative Example 1 and Comparative Example 2; indicating that the composite layer of Example 2 has a better hand feel and resilience.

Table 1 Mechanical properties of different products

As shown in Table 1, the mechanical properties of Example 1 and Comparative Example 1 were tested in three groups, and the results showed that the mechanical properties of the double-sided composite of Example 1 and the 3D mesh of Comparative Example 1 were equivalent. However, the price of Example 1 was cheaper than that of the 3D mesh of Comparative Example 1, indicating that Example 1 of the present application had a high cost performance.

Table 2 Hardness and elastic modulus data of different products

As shown in Table 2, the hardness and elastic modulus of the double-sided composite of Example 2 are similar to those of the 3D mesh of Comparative Example 1, which is better than the single-sided composite of Comparative Example 2; wherein, the larger the elastic modulus, the better the resilience of the material, and the hardness can describe the feel to a certain extent. Obviously, the resilience and feel of Example 2 are better, and the difference in the elastic modulus in the warp and weft directions is small, and the performance is more balanced.

Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims (10)

1. A composite layer, used to be arranged between a car skin and a frame, characterized in that it comprises in sequence along a first direction: A soft foam layer with a density of 40 to 60 kg/ ^m3 , a first non-woven fabric layer with a grammage of 30 to 80 g/ ^m2 , and a second non-woven fabric layer with a grammage of 30 to 80 g/ ^m2. The soft foam layer has a first surface and a second surface opposite to each other in sequence along the first direction. The first non-woven fabric layer is bonded and fixed to the first surface, and the second non-woven fabric layer is bonded and fixed to the second surface. 2. The composite layer according to claim 1 is characterized in that the soft foam layer is one of polyurethane foam material, polypropylene foam material, polyethylene foam material, ethylene-vinyl acetate copolymer foam material, and ethylene propylene diene monomer rubber foam material. 3. The composite layer according to claim 1 is characterized in that the first non-woven fabric layer and the second non-woven fabric layer are each independently selected from one of the following: spunlace non-woven fabric, needle-punched non-woven fabric, heat-bonded non-woven fabric, pulp air-laid non-woven fabric, wet-laid non-woven fabric, spunbond non-woven fabric, meltblown non-woven fabric or stitch-bonded non-woven fabric. 4. The composite layer according to claim 1, characterized in that the first non-woven fabric layer and the soft foam layer are bonded by glue or flame bonding, and the second non-woven fabric layer and the soft foam layer are bonded by glue or flame bonding. 5. A skin combination layer, characterized in that it comprises a skin and a composite layer as described in any one of claims 1 to 4, wherein the skin and the composite layer are arranged along the first direction, and the skin along the first direction is sequentially: a coating layer, a polymer dense layer, a foamed adhesive layer and a textile substrate, wherein the textile substrate is adhered and fixed to the surface of the first non-woven fabric layer. 6. The skin combination layer according to claim 5 is characterized in that the thickness of the finishing agent layer is 100 nm to 8 μm, the thickness of the polymer dense layer is 45 to 55 μm, and the thickness of the foaming adhesive layer is 150 to 250 μm. 7. The skin composite layer according to claim 5, characterized in that the finishing agent layer is a transparent film. 8. The skin combination layer according to claim 5 is characterized in that the polymer dense layer is one of polyvinyl chloride, polyurethane, polyolefin thermoplastic elastomer, and silicone. 9. The skin assembly layer according to claim 5, characterized in that the foam adhesive layer is one of polyvinyl chloride foam material, polyurethane foam material, polyolefin thermoplastic elastomer foam material, and silicone foam material. 10. The skin combination layer according to claim 5 is characterized in that it also includes: a thin film barrier layer, the skin, the composite layer and the thin film barrier layer are arranged in sequence along the first direction, and the thin film barrier layer is adhered and fixed to the surface of the second non-woven fabric layer.