Composite non-woven fabric, production device thereof and absorption product

Abstract

The composite non-woven fabric comprises an upper-layer non-woven fabric body and a lower-layer non-woven fabric body, the composite non-woven fabric body is provided with a protruding area and a micro-embossment area, and protrusions of the protruding area are provided with inner spaces located between the upper-layer non-woven fabric body and the lower-layer non-woven fabric body. The micro-relief area is located on the composite part where the upper-layer non-woven fabric and the lower-layer non-woven fabric make contact with each other and provided with concave-convex textures. The concave-convex textures of the micro-embossment area of the composite non-woven fabric are achieved through mutual extrusion of the concave-convex texture structure on the composite roller and the protrusions of the embossing convex roller in the composite process, the local pressure of the composite part can be increased, firm bonding between fibers is promoted, and therefore the bonding force of the upper-layer non-woven fabric and the lower-layer non-woven fabric is improved; the production speed and efficiency are greatly improved, and the problem that the overall soft hand feeling of the composite non-woven fabric is affected due to the fact that the composite part of an existing composite non-woven fabric is stiff and hardened is effectively solved.

Description

Technical Field

[0001] This utility model relates to the technical field of nonwoven fabrics, and in particular to a composite nonwoven fabric, its production apparatus, and absorbent products. Background Technology

[0002] The surface material of sanitary napkins and diapers is mostly non-woven fabric. Each type of non-woven fabric has its own advantages, while composite non-woven fabrics can combine the advantages of different materials to meet diverse consumer needs. Typically, composite fabrics are made by bonding two layers of non-woven fabric with adhesive using a three-roller embossing process: a needle roller in the middle, an embossing roller on top, and a perforated roller at the bottom. The first layer of non-woven fabric forms the embossing and perforation pattern between the top and middle rollers. The second layer of non-woven fabric, after being sprayed with adhesive on the front side, enters between the middle and bottom rollers, bonding with the adhesive through the fibers around the perforations. However, this traditional method has the following problems:

[0003] 1. Slow production speed.

[0004] 2. Low composite strength makes it easy to delaminate, while increasing composite strength results in poor hand feel and affects the comfort of the final product.

[0005] 3. The adhesive can easily stick to the needle roller, causing reverse pulling and increasing downtime and maintenance time. Utility Model Content

[0006] The purpose of this utility model is to overcome the defects of the existing technology and provide a composite nonwoven fabric with simple composite process, high composite strength and soft comfort, as well as its production device and absorbent product.

[0007] The technical solution of this utility model is as follows:

[0008] A composite nonwoven fabric, the composite nonwoven fabric comprising an upper nonwoven fabric and a lower nonwoven fabric;

[0009] The composite nonwoven fabric has raised areas and micro-embossed areas;

[0010] The protrusions in the protruding region have an internal space located between the upper and lower nonwoven fabrics.

[0011] The micro-relief area is located at the composite part where the upper and lower non-woven fabrics come into contact, and the micro-relief area has a raised texture with a height of 0.2mm to 1.0mm.

[0012] The height difference between the raised area and the micro-relief area is 0.5mm to 3mm.

[0013] The upper nonwoven fabric is hot-air nonwoven fabric, spunbond nonwoven fabric, or spunlace nonwoven fabric; the lower nonwoven fabric is hot-air nonwoven fabric, spunbond nonwoven fabric, or spunlace nonwoven fabric.

[0014] The raised area has several openings that connect to the internal space.

[0015] The raised or recessed texture of the micro-relief area can be a striped texture, a discretely distributed dotted texture, or a grid texture.

[0016] The micro-relief area has several through holes penetrating the composite nonwoven fabric.

[0017] This utility model also provides an absorbent article comprising the aforementioned composite nonwoven fabric, wherein the composite nonwoven fabric is located on the surface layer of the absorbent article.

[0018] This utility model also provides a production apparatus for producing the composite nonwoven fabric, including an embossing device and a composite device arranged according to the process steps;

[0019] The embossing device includes an embossing convex roller and a concave roller; the embossing convex roller and the concave roller mesh with each other; the embossing convex roller has a plurality of embossing protrusions, and the concave roller has recesses corresponding to the embossing protrusions on the embossing convex roller; the embossing convex roller is used to squeeze the fibers of the upper nonwoven fabric into the recesses of the concave roller and heat them, while the non-recessed part of the concave roller is used to squeeze the fibers between the embossing protrusions of the embossing convex roller, and the fibers are fused and solidified on the surface to form an uneven structure on the surface of the upper nonwoven fabric and wrapped around the embossing convex roller before being transported to the composite device, wherein: the protruding part of the upper nonwoven fabric wraps around the protrusions of the embossing convex roller, and the recessed part of the upper nonwoven fabric is located between the embossing protrusions of the embossing convex roller;

[0020] The composite device includes a composite roller that meshes with an embossing roller; the surface of the composite roller has a textured structure; the textured structure on the surface of the composite roller is used to combine the raised portion of the upper nonwoven fabric with the lower nonwoven fabric by heating and extrusion to form a micro-relief area of ​​the composite nonwoven fabric, and to combine the recessed portion of the upper nonwoven fabric with the lower nonwoven fabric to form a raised area of ​​the composite nonwoven fabric with an internal space.

[0021] The embossing convex roller has perforation needles with a height lower than the height of the embossing protrusions, and the concave roller has concave holes corresponding to the perforation needles on the embossing convex roller.

[0022] The embossing protrusions of the embossing roller have perforation needles, and the composite roller has concave holes corresponding to the perforation needles on the embossing roller.

[0023] The textured structure on the composite roller can be a recessed line texture, a raised discrete dot texture, or a recessed grid texture.

[0024] The composite device also includes an adhesive applicator, which is located before the lower nonwoven fabric enters the composite roller.

[0025] After adopting the above solution, the composite nonwoven fabric of this utility model can be used as the surface layer of sanitary napkins or diapers. Since the composite nonwoven fabric has raised areas formed by the protrusions of the internal space, the raised areas of the composite nonwoven fabric will come into contact with the human body during use. This can reduce the contact area with the human body and form a breathable isolation layer between the human body and the absorbent product, preventing body fluids from contacting the skin. Even if the raised areas are soaked with body fluids, the contact area is small, so there will be no sticky or stuffy feeling. The concave and convex texture structure of the micro-embossed area of ​​the composite nonwoven fabric is achieved by the concave and convex texture structure on the composite roller and the protrusions of the embossing roller during the composite process. This can increase the local pressure of the composite part, promote the strong adhesion between fibers, and thus improve the bonding force between the upper and lower nonwoven fabrics. This not only greatly improves the production speed and efficiency, but also effectively solves the problem that the existing composite nonwoven fabrics are stiff and hard in the composite part, thus affecting the overall softness of the composite nonwoven fabric. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the composite nonwoven fabric of Embodiment 1 of this utility model;

[0027] Figure 2 This is a schematic diagram of the O-O' cross-section of the composite nonwoven fabric in Embodiment 1 of this utility model;

[0028] Figure 3 This is a schematic diagram of the production device for the composite nonwoven fabric of Embodiment 1 of this utility model;

[0029] Figure 4 This is a schematic diagram of the textured surface of the composite roller in Embodiment 1 of this utility model;

[0030] Figure 5 This is a cross-sectional view of the uneven texture structure P-P' on the surface of the composite roller in Embodiment 1 of this utility model;

[0031] Figure 6 This is a schematic diagram of the composite nonwoven fabric of Embodiment 2 of this utility model;

[0032] Figure 7 This is a schematic diagram of the Q-Q' cross-section of the composite nonwoven fabric in Embodiment 2 of this utility model;

[0033] Figure 8 This is a schematic diagram of the production device for the composite nonwoven fabric of Embodiment 2 of this utility model;

[0034] Figure 9 This is a schematic diagram of the textured surface of the composite roller in Embodiment 2 of this utility model;

[0035] Figure 10 This is a cross-sectional view of the textured surface of the composite roller in Embodiment 2 of this utility model, shown in section R-R'.

[0036] Figure 11 This is a schematic diagram of the composite nonwoven fabric of Embodiment 3 of this utility model;

[0037] Figure 12 This is a schematic diagram of the S-S' cross-section of the composite nonwoven fabric in Embodiment 3 of this utility model;

[0038] Figure 13 This is a schematic diagram of the production device for the composite nonwoven fabric in Embodiment 3 of this utility model;

[0039] Figure 14 This is a schematic diagram of the textured surface of the composite roller in Embodiment 3 of this utility model;

[0040] Figure 15 This is a cross-sectional view of the textured surface of the composite roller in Embodiment 3 of this utility model, specifically the T-T' cross-sectional view.

[0041] Label Explanation:

[0042] Example 1

[0043] Composite nonwoven fabric 10, upper nonwoven fabric 1, raised part 11, recessed part 12, lower nonwoven fabric 2;

[0044] Raised area 3, raised area 31, micro-relief area 4, texture 41, internal space 5, height h1 of texture 41, height difference h2 between raised area 3 and micro-relief area 4.

[0045] Concave roller A, recessed A1, embossed convex roller B, embossed protrusion B1, composite roller C, concave-convex texture structure C1, linear texture structure C11;

[0046] Example 2

[0047] Opening e, recessed hole A2, punching needle B2, dotted texture structure C12;

[0048] Example 3

[0049] Through hole d, composite concave hole C3, first punch B3, second punch B4, mesh texture structure C13, adhesive application device D. Detailed Implementation

[0050] The technical solution of this utility model will be further explained and described below with reference to the accompanying drawings through specific embodiments.

[0051] Example 1

[0052] like Figure 1 and Figure 2As shown, this utility model discloses a composite nonwoven fabric 10, including an upper nonwoven fabric 1 and a lower nonwoven fabric 2; the composite nonwoven fabric 10 has a raised area 3 and a micro-embossed area 4; the raised area 3 has a raised portion 31 with an internal space 5 located between the upper nonwoven fabric 1 and the lower nonwoven fabric 2; the micro-embossed area 4 is located in the composite part where the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are in contact, and the composite part has a textured surface 41, the height h1 of which is 0.2mm to 1.0mm; the height difference h2 between the raised area 3 and the micro-embossed area 4 is 0.5mm to 3mm. Wherein: the raised texture 41 of the micro-relief area 4 can be a striped texture composed of several lines, a discretely distributed dotted texture, or a grid texture, etc. In Example 1, the raised texture 41 is a striped texture 411. The height h1 of the raised texture 41 is the distance between the lowest point and the highest point of the raised texture 41. The height difference h2 between the raised area 3 and the micro-relief area 4 is the height difference between the highest point of the protrusion 31 in the raised area 3 and the highest point of the raised texture 41 in the micro-relief area 4. Both h1 and h2 can be measured under a microscope. The upper nonwoven fabric 1 or the lower nonwoven fabric 2 can be a hot-air nonwoven fabric, a spunbond nonwoven fabric, or a spunlace nonwoven fabric. In Example 1, both the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are hot-air nonwoven fabrics.

[0053] like Figure 3 , Figure 4 and Figure 5 As shown, the composite nonwoven fabric 10 of this utility model is manufactured using the following production equipment, which includes an embossing device and a laminating device arranged according to the process steps; and the following production process can be adopted:

[0054] (1) The upper nonwoven fabric 1 enters the embossing device;

[0055] The embossing device includes an embossing convex roller B and a concave roller A. The embossing convex roller B and the concave roller A are meshed. The embossing convex roller B has a plurality of embossing protrusions B1, and the concave roller A has a recess A1 corresponding to the embossing protrusions B1 on the embossing convex roller B. During operation, the upper nonwoven fabric 1 enters between the embossing convex roller B and the concave roller A. The heated embossing convex roller B squeezes the fibers of the upper nonwoven fabric 1 into the recess A1 of the concave roller A. At the same time, the non-recessed part of the concave roller A squeezes the fibers between the embossing protrusions B1 of the embossing convex roller B. Through melting and solidification of the fiber surface, the surface of the upper nonwoven fabric 1 forms a concave-convex structure and is covered on the embossing convex roller B and conveyed to the composite device. The protruding part 11 of the upper nonwoven fabric 1 covers the protrusions B1 of the embossing convex roller B, and the recessed part 12 of the upper nonwoven fabric 1 is located between the embossing protrusions B1 of the embossing convex roller B.

[0056] (2) The upper nonwoven fabric 1 is embossed in step (1) and then enters the composite device to be composited with the lower nonwoven fabric 2;

[0057] The composite device includes a composite roller C that meshes with the embossing roller B. The surface of the composite roller C has a textured structure C1, wherein: in Example 1, the textured structure C1 is a line textured structure C11 composed of several line grooves; during operation, the upper nonwoven fabric 1 and the lower nonwoven fabric 2 enter the composite device and are heated and extruded by the textured structure C1 on the surface of the composite roller C. The raised portion 11 of the upper nonwoven fabric 1 is combined with the lower nonwoven fabric 2 to form a micro-relief area 4 of the composite nonwoven fabric. The recessed portion 12 of the upper nonwoven fabric 1 and the lower nonwoven fabric 2 form a raised area 3 of the composite nonwoven fabric with an internal space 5, thereby forming a composite nonwoven fabric 10 with raised area 3 and micro-relief area 4.

[0058] The composite nonwoven fabric 10 can be used in absorbent products, including sanitary napkins, panty liners, diapers, etc. The absorbent product can consist of a top layer, an absorbent layer, and a bottom layer, wherein the composite nonwoven fabric 10 is located in the top layer of the absorbent product. When consumers use the product, the bodily fluids they excrete come into contact with the surface of the composite nonwoven fabric 10. Because the composite nonwoven fabric 10 has raised areas 3 formed by the protrusions 31 of the internal space 5, these raised areas 3 will come into contact with the human body during use. This reduces the contact area with the human body and forms a breathable isolation layer between the human body and the absorbent product, preventing bodily fluids from contacting the skin. Even if the protrusions 31 of the raised areas 3 are soaked with bodily fluids, the contact area is small, so there will be no sticky or stuffy feeling. The raised and recessed striped texture of the micro-embossed area 4 of the composite nonwoven fabric 10 is achieved during the composite process by the mutual squeezing of the line texture C11 formed by the line grooves on the composite roller C and the embossing protrusions B1 on the embossing roller B. This increases the local pressure of the composite part, promotes the strong adhesion between the fibers, and thus improves the bonding force between the upper nonwoven fabric 1 and the lower nonwoven fabric 2, which greatly improves the production speed and efficiency. In addition, the texture height h1 is in the range of 0.2mm to 1mm. If it is too low, it will not be able to increase local pressure, and if it is too high, it will affect the feel of the composite nonwoven fabric. The height difference h2 between the raised area 3 and the micro-embossed area 4 is in the range of 0.5mm to 3mm. If it is too low, it will not be able to provide breathability and isolation, and if it is too high, it will seriously affect the softness and comfort of the composite nonwoven fabric.

[0059] Example 2

[0060] like Figure 6 and Figure 7As shown, this utility model discloses a composite nonwoven fabric 10, including an upper nonwoven fabric 1 and a lower nonwoven fabric 2; the composite nonwoven fabric 10 has a raised area 3 and a micro-relief area 4; the raised area 3 has a raised portion 31 with an internal space 5 between the upper nonwoven fabric 1 and the lower nonwoven fabric 2, and has several openings e on the raised portion 31; the micro-relief area 4 is located in the composite part where the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are in contact, and has a raised texture 41 in the composite part, the height h1 of the raised texture 41 being 0.2mm to 1.0mm; the height difference h2 between the raised area 3 and the micro-relief area 4 is 0.5mm to 3mm. In Example 2, the texture 41 is a discrete dot texture 412. The upper nonwoven fabric 1 or the lower nonwoven fabric 2 can be hot-air nonwoven fabric, spunbond nonwoven fabric or spunlace nonwoven fabric. In Example 2, the upper nonwoven fabric 1 is pure cotton spunlace nonwoven fabric and the lower nonwoven fabric 2 is hot-air nonwoven fabric.

[0061] like Figure 8 , Figure 9 and Figure 10 As shown, the production device and manufacturing method used in the composite nonwoven fabric 10 of this utility model are the same as those in Embodiment 1: except that the embossing roller B has several embossing protrusions B1 and perforation needles B2 with a height lower than the height of the embossing protrusions B1, and the concave roller A has recesses A1 corresponding to the embossing protrusions B1 on the embossing roller B and concave holes A2 corresponding to the perforation needles B2 on the embossing roller B; during operation, the upper nonwoven fabric 1 enters between the embossing roller B and the concave roller A, and the heated embossing roller B squeezes the fibers of the upper nonwoven fabric 1 onto the concave roller. In the recess A1 of A, the perforating needle B2 pierces the upper nonwoven fabric 1, while the non-recessed part of the concave roller A squeezes the fibers between the embossing protrusions B1 of the embossing roller B. Through the melting and solidification of the fiber surface, the surface of the upper nonwoven fabric 1 forms a concave-convex structure and is covered on the embossing roller B and conveyed to the composite device. The protruding part 11 of the upper nonwoven fabric 1 is covered on the embossing protrusions B1 of the embossing roller B, and the recessed part 12 of the upper nonwoven fabric 1 is located between the embossing protrusions B1 of the embossing roller B and is pierced by the perforating needle B2.

[0062] During lamination, the lamination device is a composite roller C that meshes with the embossing roller B. The surface of the composite roller C has a raised texture structure C1, wherein: in Example 2, the raised texture structure C1 is a raised, discretely distributed dot-like texture structure C12; since the height of the perforating needle B2 is lower than the height of the embossing protrusion B1, when heated and extruded through the raised dot-like texture structure C12 on the surface of the composite roller C, the perforating needle B2 will not interfere with the lamination process, but will only peel off from the upper nonwoven fabric 1. Therefore, the raised portion 11 of the upper nonwoven fabric 1 can be laminated with the lower nonwoven fabric 2 to form a micro-relief area 4 of the composite nonwoven fabric. The recessed portion 12 of the upper nonwoven fabric 1 and the lower nonwoven fabric 2 form a raised area 3 of the composite nonwoven fabric with an internal space 5. Several openings e are formed on the protrusions 31 of the raised area 3, thereby forming a composite nonwoven fabric 10 with raised area 3 and micro-relief area 4.

[0063] In this embodiment 2, the raised area 3 has several openings e on the raised area 31, which can further improve the air permeability of the composite nonwoven fabric. Furthermore, when bodily fluids come into contact with the raised area 31 of the composite nonwoven fabric 10, the fluids can quickly penetrate from the openings e into the internal space 5 of the raised area 31, temporarily storing the fluids and preventing leakage. In this embodiment 2, the textured structure C1 on the composite roller C is a discretely distributed dotted textured structure C12. Especially when the blank space of the composite roller C1 is small, this discretely distributed dotted textured structure C12 can be set, which requires lower precision in mold processing. These small protrusions can increase local pressure, promoting a strong bond between the upper nonwoven fabric 1 and the lower nonwoven fabric 2, further improving product quality and user comfort.

[0064] Example 3

[0065] like Figure 11 and Figure 12As shown, this utility model discloses a composite nonwoven fabric 10, including an upper nonwoven fabric 1 and a lower nonwoven fabric 2; the composite nonwoven fabric 10 has a raised area 3 and a micro-embossed area 4; the raised area 3 has a raised portion 31 with an internal space 5 between the upper nonwoven fabric 1 and the lower nonwoven fabric 2, and has several openings e on the raised portion 31; the micro-embossed area 4 is located in the composite part where the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are in contact, and has a textured surface 41 in the composite part. The height h1 of the raised texture 41 is 0.2mm to 1.0mm; the height difference h2 between the raised area 3 and the micro-relief area 4 is 0.5mm to 3mm, and the micro-relief area 4 also has several through holes d. In Example 3, the raised texture 41 is a mesh texture 413, and the upper nonwoven fabric 1 or the lower nonwoven fabric 2 can be hot air nonwoven fabric, spunbond nonwoven fabric or hydroentangled nonwoven fabric. In Example 2, the upper nonwoven fabric 1 is hot air nonwoven fabric and the lower nonwoven fabric 2 is spunbond nonwoven fabric.

[0066] like Figure 13 , Figure 14 and Figure 15 As shown, the production device and manufacturing method used in the composite nonwoven fabric 10 of this utility model are the same as those in Embodiment 1: except that the embossing roller B has a plurality of embossing protrusions B1 and perforation needles, wherein a plurality of first perforation needles B3 are provided on the embossing protrusions B1, and the embossing roller B also has second perforation needles B4 with a height lower than that of the embossing protrusions B1, and the concave roller A has a recess A1 corresponding to the embossing protrusions B1 on the embossing roller B, and also has a recess A2 corresponding to the second perforation needles B4 on the embossing roller B; during operation, the upper nonwoven fabric 1 enters between the embossing roller B and the concave roller A, and the heated embossing roller B pushes the upper nonwoven fabric 1 between the embossing roller B and the concave roller A. The fibers of the nonwoven fabric 1 are squeezed into the recess A1 of the concave roller A, while the perforating needles B2 and B3 pierce the upper nonwoven fabric 1. The non-recessed part of the concave roller A squeezes the fibers between the embossing protrusions B1 of the embossing roller B. The fibers are fused and solidified on the surface, so that the surface of the upper nonwoven fabric 1 forms a concave-convex structure and is covered on the embossing roller B and conveyed to the composite device. The protruding part 11 of the upper nonwoven fabric 1 is covered on the protrusions B1 of the embossing roller B and is pierced and covered by the first perforating needle B3. The recessed part 12 of the upper nonwoven fabric is located between the embossing protrusions B1 of the embossing roller B and is pierced and covered by the second perforating needle B4.

[0067] In this embodiment, the composite device includes a composite roller C and an adhesive applicator D. The adhesive applicator D is positioned before the lower nonwoven fabric 2 enters the composite roller C, so that the lower nonwoven fabric 2 is first sprayed with hot melt adhesive and then composited with the upper nonwoven fabric 1. The surface of the composite roller C has a textured structure C1 and a composite recessed hole C3 corresponding to the first perforation needle B3 on the embossing roller B. In Example 3, the textured structure C1 is a recessed grid texture C13. During the composite process, the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are heated and extruded through the textured structure C1 on the surface of the composite roller C. The raised portion 11 of the upper nonwoven fabric 1 is combined with the lower nonwoven fabric 2 to form a micro-relief area 4 of the composite nonwoven fabric. At the same time, the first perforation needle B3 pierces the lower nonwoven fabric 2 again after piercing the upper nonwoven fabric 1, forming several through holes d on the micro-relief area 4 of the composite nonwoven fabric. The recessed portion 12 of the upper nonwoven fabric 1 and the lower nonwoven fabric 2 form a raised area 3 of the composite nonwoven fabric with an internal space 5. Several openings e are formed on the protrusions 31 of the raised area 3, thereby forming a composite nonwoven fabric 10 with a raised area 3 and a micro-relief area 4.

[0068] In this embodiment 3, the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are laminated using hot melt adhesive, which further increases the composite strength of the laminated nonwoven fabric 10. However, in existing adhesive bonding processes, during the perforation process, the first perforating needle B3 has a certain temperature, making it easy for excess hot melt adhesive to stick to it. This can lead to problems such as the nonwoven fabric at the end of the connecting hole d being pulled back to the top of the connecting hole d when the first perforating needle B3 retracts from the laminated part, resulting in poor opening conditions such as pull-back holes or blind holes. In this embodiment 3, the composite roller C is designed with a recessed grid texture C13, which can guide excess hot melt adhesive during the operation of the device, resulting in a uniform adhesive distribution and reducing the phenomenon of hot melt adhesive sticking to the perforating needle B3. This effectively reduces downtime and maintenance time caused by adhesive problems, thereby significantly improving production speed and efficiency, and improving the feel of the final product. Alternatively, ultrasonic bonding can be used during the lamination process of the upper and lower nonwoven fabrics to increase the composite strength and prevent the risk of pull-back. Meanwhile, the several through holes d in the micro-relief area 4 can further accelerate the permeation rate of body fluids in the composite part, and improve the absorbency and comfort of the composite nonwoven fabric.

[0069] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model patent and the contents of the specification should still fall within the scope of the present utility model.

Claims

1. A composite nonwoven fabric, characterized in that: The composite nonwoven fabric includes an upper nonwoven fabric and a lower nonwoven fabric; The composite nonwoven fabric has raised areas and micro-embossed areas; The protrusions in the protruding region have an internal space located between the upper and lower nonwoven fabrics. The micro-relief area is located at the composite part where the upper and lower non-woven fabrics come into contact, and the micro-relief area has a raised texture with a height of 0.2mm to 1.0mm. The height difference between the raised area and the micro-relief area is 0.5mm to 3mm.

2. The composite nonwoven fabric as described in claim 1, characterized in that: The upper nonwoven fabric is hot-air nonwoven fabric, spunbond nonwoven fabric, or spunlace nonwoven fabric; the lower nonwoven fabric is hot-air nonwoven fabric, spunbond nonwoven fabric, or spunlace nonwoven fabric.

3. The composite nonwoven fabric as described in claim 1, characterized in that: The raised area has several openings that connect to the internal space.

4. The composite nonwoven fabric as described in claim 1, characterized in that: The raised or recessed texture of the micro-relief area can be a striped texture, a discretely distributed dotted texture, or a grid texture.

5. The composite nonwoven fabric as described in claim 1, characterized in that: The micro-relief area has several through holes penetrating the composite nonwoven fabric.

6. An absorbent article comprising the composite nonwoven fabric according to any one of claims 1-5, characterized in that: The composite nonwoven fabric is located on the surface of the absorbent product.

7. A production apparatus for producing the composite nonwoven fabric according to any one of claims 1-5, characterized in that: This includes embossing devices and composite devices set up according to the process steps; The embossing device includes an embossing convex roller and a concave roller; the embossing convex roller and the concave roller mesh with each other; the embossing convex roller has a plurality of embossing protrusions, and the concave roller has recesses corresponding to the embossing protrusions on the embossing convex roller; the embossing convex roller is used to squeeze the fibers of the upper nonwoven fabric into the recesses of the concave roller and heat them, while the non-recessed part of the concave roller is used to squeeze the fibers between the embossing protrusions of the embossing convex roller, and the fibers are fused and solidified on the surface to form an uneven structure on the surface of the upper nonwoven fabric and wrapped around the embossing convex roller before being transported to the composite device, wherein: the protruding part of the upper nonwoven fabric wraps around the protrusions of the embossing convex roller, and the recessed part of the upper nonwoven fabric is located between the embossing protrusions of the embossing convex roller; The composite device includes a composite roller that meshes with an embossing roller; the surface of the composite roller has a textured structure; the textured structure on the surface of the composite roller is used to combine the raised portion of the upper nonwoven fabric with the lower nonwoven fabric by heating and extrusion to form a micro-relief area of ​​the composite nonwoven fabric, and to combine the recessed portion of the upper nonwoven fabric with the lower nonwoven fabric to form a raised area of ​​the composite nonwoven fabric with an internal space.

8. The production apparatus for composite nonwoven fabric as described in claim 7, characterized in that: The embossing convex roller has perforation needles with a height lower than the height of the embossing protrusions, and the concave roller has concave holes corresponding to the perforation needles on the embossing convex roller.

9. The production apparatus for composite nonwoven fabric as described in claim 7, characterized in that: The embossing protrusions of the embossing roller have perforation needles, and the composite roller has concave holes corresponding to the perforation needles on the embossing roller.

10. The production apparatus for composite nonwoven fabric as described in claim 7, characterized in that: The textured structure on the composite roller can be a recessed line texture, a raised discrete dot texture, or a recessed grid texture.

11. The production apparatus for composite nonwoven fabric as described in claim 7, characterized in that: The composite device also includes an adhesive applicator, which is located before the lower nonwoven fabric enters the composite roller.

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