Composite non-woven fabric, manufacturing method thereof and absorption product

Abstract

The composite non-woven fabric comprises an upper layer non-woven fabric and a lower layer non-woven fabric, the composite non-woven fabric is provided with a protruding area and a micro-embossment area, the protrusions of the protruding area are provided with inner spaces located between the upper layer non-woven fabric and the lower layer non-woven fabric, and the micro-embossment area is located between the inner spaces. 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] The present invention relates to the technical field of nonwoven fabrics, and in particular to a composite nonwoven fabric, a manufacturing method thereof and an absorbent product. Background Art

[0002] The surface materials of sanitary napkins and diapers are mostly non-woven fabrics. Various non-woven fabrics have their own advantages, and composite non-woven fabrics can combine the advantages of different materials to meet the different needs of consumers for products. Usually, the composite is made by bonding two layers of non-woven fabrics with glue, using three-roll embossing composite: the middle is a needle roller, the upper is an embossing roller, and the lower is a concave hole roller. The first layer of non-woven fabric is formed with embossing and hole patterns between the upper roller and the middle roller. The second layer of non-woven fabric enters between the middle roller and the lower roller after the front side is sprayed with glue, and the composite is achieved by bonding the fibers around the holes with glue. However, this traditional method has the following problems: 1. The production speed is slow.

[0003] 2. The composite strength is low and it is easy to delaminate. However, increasing the composite strength will result in a poor hand feel, affecting the comfort of the final product.

[0004] 3. The glue easily sticks to the needle roller, causing pull-out, increasing downtime and maintenance time. Summary of the invention

[0005] The object of the present invention is to overcome the defects of the prior art and provide a composite nonwoven fabric with simple composite process, high composite strength, softness and comfort, a manufacturing method thereof and an absorbent product.

[0006] The technical solution of the present invention is as follows: A composite nonwoven fabric, comprising an upper nonwoven fabric and a lower nonwoven fabric; The composite nonwoven fabric has a raised area and a micro-embossed area; The protrusions of the protrusion area have an inner space between the upper nonwoven fabric and the lower nonwoven fabric; The micro-relief area is located at the composite part where the upper non-woven fabric and the lower non-woven fabric are in contact, and the micro-relief area has a concave-convex texture, and the height of the concave-convex texture is 0.2 mm to 1.0 mm; The height difference between the raised area and the micro-relief area is 0.5 mm to 3 mm.

[0007] The upper nonwoven fabric is a hot air nonwoven fabric, a spunbond nonwoven fabric or a spunlace nonwoven fabric; the lower nonwoven fabric is a hot air nonwoven fabric, a spunbond nonwoven fabric or a spunlace nonwoven fabric.

[0008] The protrusions in the protrusion area are provided with a plurality of openings communicating with the internal space.

[0009] The concavo-convex texture of the micro-relief area is a stripe texture, a discretely distributed dot texture or a grid texture.

[0010] The micro-relief area has a plurality of through holes penetrating the composite non-woven fabric.

[0011] The present invention also provides an absorbent product comprising the composite nonwoven fabric, wherein the composite nonwoven fabric is located on the surface layer of the absorbent product.

[0012] The present invention also provides a method for manufacturing a composite nonwoven fabric, the main production steps comprising: (1) The upper nonwoven fabric enters the embossing device; Wherein: the embossing device comprises an embossing convex roller and a concave roller; the embossing convex roller is meshed with the concave roller, wherein: the embossing convex roller is provided with a plurality of embossing protrusions, and the concave roller is provided with depressions corresponding to the embossing protrusions on the embossing convex roller; during operation, the upper non-woven fabric enters between the embossing convex roller and the concave roller, and the heated embossing convex roller squeezes the fibers of the upper non-woven fabric into the depressions of the concave roller, and at the same time, the non-depressed part of the concave roller squeezes the fibers between the embossing protrusions of the embossing convex roller, and the fiber surface is melted, consolidated and shaped, so that a concave-convex structure is formed on the surface of the upper non-woven fabric and coated on the embossing convex roller and transported to the composite device, wherein: the convex part of the upper non-woven fabric is coated on the convex part of the embossing convex roller, and the concave part of the upper non-woven fabric is located between the embossing protrusions of the embossing convex roller; (2) The upper nonwoven fabric is embossed in step (1) and then enters a composite device to be composited with the lower nonwoven fabric; The composite device is a composite roller meshed with an embossed convex roller, and the surface of the composite roller has a concave-convex texture structure; during operation, the upper non-woven fabric and the lower non-woven fabric enter the composite device, and are heated and extruded through the concave-convex texture structure on the surface of the composite roller, and the convex part of the upper non-woven fabric is composited with the lower non-woven fabric to form a micro-embossed area of ​​the composite non-woven fabric, and the concave part of the upper non-woven fabric forms a convex area of ​​the composite non-woven fabric with an internal space with the lower non-woven fabric, thereby forming a composite non-woven fabric with a convex area and a micro-embossed area.

[0013] The embossing convex roller is provided with punching needles whose height is lower than the height of the embossing protrusions, and the concave roller is provided with concave holes corresponding to the punching needles on the embossing convex roller.

[0014] The embossing protrusions of the embossing roller are provided with punching needles, and the composite roller is provided with concave holes corresponding to the punching needles on the embossing roller.

[0015] The concave-convex texture structure on the composite roller is a concave line texture structure, a convex discretely distributed dot texture structure or a concave grid texture structure.

[0016] The upper non-woven fabric and the lower non-woven fabric are composited by hot melt adhesive or ultrasonic welding.

[0017] After adopting the above scheme, the composite non-woven fabric of the present invention can be used for the surface layer of sanitary napkins or diapers. Since the composite non-woven fabric has a raised area formed by the protrusions of the internal space, the raised area of ​​the composite non-woven fabric will contact the human body when in use, which can not only reduce the contact area with the human body, but also form a breathable isolation layer between the human body and the absorbent product to prevent body fluids from contacting the skin. Even if the protrusions in the raised area are soaked by body fluids but the contact area is small, there will be no adhesion to the skin and a stuffy feeling; and the concave-convex texture structure of the micro-embossed area of ​​the composite non-woven fabric is achieved by the concave-convex texture structure on the composite roller and the protrusions of the embossed convex roller during the composite process. It can increase the local pressure of the composite part, promote the firm bonding between the fibers, and thus improve the bonding force between the upper non-woven fabric and the lower non-woven fabric, which not only greatly improves the production speed and efficiency, but also effectively solves the problem that the composite non-woven fabric is stiff and hardened in the composite part, thereby affecting the overall soft feel of the composite non-woven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the composite nonwoven fabric of Example 1 of the present invention; Figure 2 Schematic diagram of the O-O' cross section of the composite nonwoven fabric of Example 1 of the present invention; Figure 3 This is a schematic diagram of the production process of the composite nonwoven fabric of Example 1 of the present invention; Figure 4 Schematic diagram of the concave-convex texture structure on the surface of the composite roller of Example 1 of the present invention; Figure 5 This is a cross-sectional view of the concave-convex texture structure PP' of the composite roller surface of Example 1 of the present invention; Figure 6 is a schematic diagram of a composite nonwoven fabric according to Example 2 of the present invention; Figure 7 It is a schematic diagram of the Q-Q' cross section of the composite nonwoven fabric of Example 2 of the present invention; Figure 8 This is a schematic diagram of the production process of the composite nonwoven fabric of Example 2 of the present invention; Fig. 9 Schematic diagram of the concave-convex texture structure on the surface of the composite roller of Example 2 of the present invention; Fig.10 It is a cross-sectional view of the concave-convex texture structure of the composite roller surface of Example 2 of the present invention along the line R-R'; Fig.11 is a schematic diagram of a composite nonwoven fabric according to Example 3 of the present invention; Fig.12 Schematic diagram of the S-S' cross section of the composite nonwoven fabric of Example 3 of the present invention; Fig.13 This is a schematic diagram of the production process of the composite nonwoven fabric of Example 3 of the present invention; Fig.14 Schematic diagram of the concave-convex texture structure on the surface of the composite roller of Example 3 of the present invention; Fig.15 This is a cross-sectional view of the concave-convex texture structure on the surface of the composite roller of Example 3 of the present invention.

[0019] Description of labels: Example 1 Composite nonwoven fabric 10, upper nonwoven fabric 1, raised portion 11, recessed portion 12, lower nonwoven fabric 2; Raised area 3, convexity 31, micro-relief area 4, concavo-convex texture 41, inner space 5, height h1 of concavo-convex texture 41, height difference h2 between raised area 3 and micro-relief area 4; Concave roller A, concave A1, embossed convex roller B, embossed convex B1, composite roller C, concave-convex texture structure C1, line texture structure C11; Example 2 Open hole e, concave hole A2, punch needle B2, dot texture structure C12; Example 3 Through hole d, composite concave hole C3, first punching needle B3, second punching needle B4, grid texture structure C13. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be further illustrated and described below through specific implementation modes in combination with the accompanying drawings.

[0021] Example 1 like Figure 1 and Figure 2As shown, the present invention discloses a composite non-woven fabric 10, comprising an upper non-woven fabric 1 and a lower non-woven fabric 2; the composite non-woven fabric 10 has a raised area 3 and a micro-embossed area 4; the protrusion 31 of the raised area 3 has an internal space 5 located between the upper non-woven fabric 1 and the lower non-woven fabric 2; the micro-embossed area 4 is located in a composite part where the upper non-woven fabric 1 and the lower non-woven fabric 2 are in contact, and a concave-convex texture 41 is provided in the composite part, and a height h1 of the concave-convex texture 41 is 0.2 mm to 1.0 mm; a height difference h2 between the raised area 3 and the micro-embossed area 4 is 0.5 mm to 3 mm. Wherein: the concave-convex texture 41 of the micro-relief area 4 can be a stripe texture composed of several lines, a discretely distributed dot texture or a grid texture, etc. The concave-convex texture 41 in Example 1 is a stripe texture 411, and the height h1 of the concave-convex texture 41 is the distance between the lowest point and the highest point of the concave-convex 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 of the raised area 3 and the highest point of the concave-convex texture 41 of the micro-relief area 4. Both h1 and h2 can be measured under a microscope. The upper non-woven fabric 1 or the lower non-woven fabric 2 can be a hot air non-woven fabric, a spunbond non-woven fabric or a spunlace non-woven fabric. In Example 1, the upper non-woven fabric 1 and the lower non-woven fabric 2 are both hot air non-woven fabrics.

[0022] like Figure 3 , Figure 4 and Figure 5 As shown, the composite nonwoven fabric 10 of the present invention is manufactured by the following method: (1) The upper nonwoven fabric 1 enters the embossing device; Wherein: the embossing device comprises an embossing convex roller B and a concave roller A; the embossing convex roller B is meshed with the concave roller A, wherein: the embossing convex roller B has a plurality of embossing protrusions B1, and the concave roller A has a concave depression A1 corresponding to the embossing protrusions B1 on the embossing convex roller B; during operation, the upper non-woven fabric 1 enters between the embossing convex roller B and the concave roller A, and the heated embossing convex roller B squeezes the fibers of the upper non-woven fabric 1 into the concave depression A1 of the concave roller A, and at the same time, the non-concave part of the concave roller A squeezes the fibers between the embossing protrusions B1 of the embossing convex roller B, and the fiber surface is melted and solidified to form a concave-convex structure on the surface of the upper non-woven fabric 1 and is coated on the embossing convex roller B and transported to the composite device, wherein: the convex part 11 of the upper non-woven fabric 1 is coated on the protrusion B1 of the embossing convex roller B, and the concave part 12 of the upper non-woven fabric 1 is located between the embossing protrusions B1 of the embossing convex roller B; (2) The upper nonwoven fabric 1 is embossed in step (1) and then enters a compounding device to be compounded with the lower nonwoven fabric 2; The composite device is a composite roller C meshing with the embossed convex roller B, and the surface of the composite roller C has a concave-convex texture structure C1, wherein: the concave-convex texture structure C1 in Example 1 is a line texture structure C11 composed of a plurality of line grooves; during operation, the upper non-woven fabric 1 and the lower non-woven fabric 2 enter the composite device, and are heated and extruded by the concave-convex texture structure C1 on the surface of the composite roller C, and the raised portion 11 of the upper non-woven fabric 1 is composited with the lower non-woven fabric 2 to form a micro-embossed area 4 of the composite non-woven fabric, and the recessed portion 12 of the upper non-woven fabric 1 forms a raised area 3 of the composite non-woven fabric with an internal space 5 with the lower non-woven fabric 2, thereby forming a composite non-woven fabric 10 with a raised area 3 and a micro-embossed area 4.

[0023] The composite nonwoven fabric 10 can be used in absorbent products, including sanitary napkins, sanitary pads, diapers, etc. The absorbent product can be composed of a surface layer, an absorbent layer and a bottom layer, wherein the composite nonwoven fabric 10 is located on the surface layer of the absorbent product. When the consumer uses the composite nonwoven fabric 10, the body fluids discharged will contact the surface of the composite nonwoven fabric 10. Since the composite nonwoven fabric 10 has a raised area 3 formed by the protrusions 31 of the internal space 5, the raised area 3 of the composite nonwoven fabric 10 will contact the human body during use, which can not only reduce the contact area with the human body, but also form a breathable isolation layer between the human body and the absorbent product to prevent body fluids from contacting the skin. Even if the protrusions 31 of the raised area 3 are soaked by body fluids, but the contact area is small, there will be no adhesion to the skin and stuffy feeling. The concave and convex striped texture of the micro-embossed area 4 of the composite nonwoven fabric 10 is achieved by the mutual extrusion of the line texture C11 composed of line grooves on the composite roller C and the embossed protrusions B1 of the embossed convex roller B during the composite process, which can increase the local pressure of the composite part, promote the firm adhesion between the fibers, thereby improving the bonding force between the upper nonwoven fabric 1 and the lower nonwoven fabric 2, and greatly improving 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 play a role in increasing the local pressure, and if it is too high, it will affect the feel of the composite non-woven fabric. The height difference h2 between the raised area 3 and the micro-relief area 4 is in the range of 0.5mm to 3mm. If it is too low, it will not play a role in breathability and isolation, and if it is too high, it will seriously affect the softness and comfort of the composite non-woven fabric.

[0024] Example 2 like Figure 6 and Figure 7As shown, the present invention discloses a composite non-woven fabric 10, comprising an upper non-woven fabric 1 and a lower non-woven fabric 2; the composite non-woven fabric 10 has a raised area 3 and a micro-embossed area 4; the protrusion 31 of the raised area 3 has an internal space 5 located between the upper non-woven fabric 1 and the lower non-woven fabric 2, and has a plurality of openings e on the protrusion 31 of the raised area 3; the micro-embossed area 4 is located in a composite part where the upper non-woven fabric 1 and the lower non-woven fabric 2 are in contact, and has a concave-convex texture 41 in the composite part, and the height h1 of the concave-convex texture 41 is 0.2mm~1.0mm; the height difference h2 between the raised area 3 and the micro-embossed area 4 is 0.5mm~3mm. Among them: the concave-convex texture 41 in Example 2 is a discretely distributed dot texture 412, the upper non-woven fabric 1 or the lower non-woven fabric 2 can be a hot air non-woven fabric, a spunbond non-woven fabric or a spunlace non-woven fabric, and the upper non-woven fabric 1 in Example 2 is a pure cotton spunlace non-woven fabric, and the lower non-woven fabric 2 is a hot air non-woven fabric.

[0025] like Figure 8 , Fig. 9 and Fig.10 As shown, the manufacturing method of the composite nonwoven fabric 10 of the present invention is the same as that of Example 1: except that the embossing roller B has a plurality of embossing protrusions B1 and also has punching needles B2 whose height is lower than that of the embossing protrusions B1, and the concave roller A has depressions A1 corresponding to the embossing protrusions B1 on the embossing roller B, and also has concave holes A2 corresponding to the punching 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 into the concave holes of the concave roller A. The non-depressed part of the concave roller A squeezes the fibers between the embossed protrusions B1 of the embossing convex roller B, and the fibers are melted and solidified on the surface of the fibers, so that a concave-convex structure is formed on the surface of the upper non-woven fabric 1 and the fibers are coated on the embossing convex roller B and transported to the composite device, wherein: the convex part 11 of the upper non-woven fabric 1 is coated on the embossing protrusions B1 of the embossing convex roller B, and the concave part 12 of the upper non-woven fabric 1 is located between the embossing protrusions B1 of the embossing convex roller B and is pierced by the punching needle B2; During compounding, the compounding device is a compound roller C meshing with the embossed convex roller B, and the surface of the compound roller C has a concave-convex texture structure C1, wherein: the concave-convex texture structure C1 in Example 2 is a raised discretely distributed dot texture structure C12; since the height of the punching needle B2 is lower than the height of the embossed protrusion B1, when the raised dot texture structure C12 on the surface of the compound roller C is heated and extruded, the punching needle B2 will not interfere with the compounding process, and will only be peeled off from the upper non-woven fabric 1, so the raised portion 11 of the upper non-woven fabric 1 can be compounded with the lower non-woven fabric 2 to form a micro-embossed area 4 of the composite non-woven fabric, the recessed portion 12 of the upper non-woven fabric 1 and the lower non-woven fabric 2 form a raised area 3 of the composite non-woven fabric with an internal space 5, and a number of openings e are formed on the protrusion 31 of the raised area 3, thereby forming a composite non-woven fabric 10 with a raised area 3 and a micro-embossed area 4.

[0026] The protrusions 31 of the raised area 3 described in this embodiment 2 have a number of openings e, which can further improve the air permeability of the composite non-woven fabric, and when the body fluid contacts the protrusions 31 of the raised area 3 of the composite non-woven fabric 10, the body fluid can quickly penetrate from the openings e into the internal space 5 of the protrusions 31 of the raised area 3 of the composite non-woven fabric, which can temporarily store the body fluid and prevent the body fluid from leaking. The concave-convex texture structure C1 on the composite roller C in this embodiment 2 is a raised discretely distributed dot texture structure C12. Especially when the blank position of the composite roller C1 is small, this discretely distributed raised dot texture structure C12 can be set, which has low requirements on mold processing accuracy, and these small protrusions can increase local pressure, promote firm bonding between the upper non-woven fabric 1 and the lower non-woven fabric 2, and further improve the quality and comfort of the product.

[0027] Example 3 like Fig.11 and Fig.12 As shown, the present invention discloses a composite nonwoven fabric 10, comprising 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 protrusions 31 of the raised area 3 have an internal space 5 located between the upper nonwoven fabric 1 and the lower nonwoven fabric 2, and a plurality of openings e are provided on the protrusions 31 of the raised area 3; the micro-embossed area 4 is located at a composite part where the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are in contact, and the composite part has a concave-convex texture 41, so that The height h1 of the concave-convex texture 41 is 0.2mm~1.0mm; the height difference h2 between the raised area 3 and the micro-relief area 4 is 0.5mm~3mm, and the micro-relief area 4 also has a number of through holes d, wherein: the concave-convex texture 41 in Example 3 is a grid texture 413, the upper non-woven fabric 1 or the lower non-woven fabric 2 can be a hot air non-woven fabric, a spunbond non-woven fabric or a spunlace non-woven fabric, and the upper non-woven fabric 1 in Example 2 is a hot air non-woven fabric, and the lower non-woven fabric 2 is a spunbond non-woven fabric.

[0028] like Fig.13 , Fig.14 and Fig.15 As shown, the manufacturing method of the composite nonwoven fabric 10 of the present invention is the same as that of Example 1: except that the embossing roller B has a plurality of embossing protrusions B1 and punching needles, wherein a plurality of first punching needles B3 are arranged on the embossing protrusions B1, and the embossing roller B also has a second punching needle B4 whose height is lower than the height of the embossing protrusions B1, and the concave roller A has a depression A1 corresponding to the embossing protrusions B1 on the embossing roller B, and also has a concave hole A2 corresponding to the second punching needle 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 The fibers are squeezed into the depression A1 of the concave roller A, and at the same time, the punching needles B2 and B3 pierce the upper non-woven fabric 1, and the non-depressed part of the concave roller A squeezes the fibers between the embossed protrusions B1 of the embossing roller B, and the fiber surface is melted, consolidated and shaped, so that a concave-convex structure is formed on the surface of the upper non-woven fabric 1 and coated on the embossing roller B and transported to the composite device, wherein: the convex part 11 of the upper non-woven fabric 1 is coated on the protrusion B1 of the embossing roller B and is pierced and coated by the first punching needle B3, and the concave part 12 of the upper non-woven fabric is located between the embossed protrusions B1 of the embossing roller B and is pierced and coated by the second punching needle B4.

[0029] The lower nonwoven fabric 2 is first sprayed with hot melt adhesive and then composited with the upper nonwoven fabric 1. The composite device is a composite roller C meshed with the embossed convex roller B, and the surface of the composite roller C has a concave-convex texture structure C1 and composite concave holes C3 corresponding to the first punching needles B3 on the embossed convex roller B, wherein: the concave-convex texture structure C1 in Example 3 is a concave grid texture C13; during composite, the upper nonwoven fabric 1 and the lower nonwoven fabric 2 are heated and extruded by the concave-convex texture structure C1 on the surface of the composite roller C, and the convex part 11 of the upper nonwoven fabric 1 is composited with the lower nonwoven fabric 2. And a micro-embossed area 4 of the composite non-woven fabric is formed. At the same time, the first punching needle B3 pierces the lower non-woven fabric 2 again on the basis of piercing the upper non-woven fabric 1, forming a plurality of through holes d on the micro-embossed area 4 of the composite non-woven fabric; the recessed portion 12 of the upper non-woven fabric 1 and the lower non-woven fabric 2 form a raised area 3 of the composite non-woven fabric with an internal space 5, and a plurality of openings e are formed on the protrusions 31 of the raised area 3, thereby forming a composite non-woven fabric 10 having a raised area 3 and a micro-embossed area 4.

[0030] In the composite process of the upper non-woven fabric 1 and the lower non-woven fabric 2 described in this embodiment 3, hot melt adhesive is used to further increase the composite strength of the composite non-woven fabric 10. In the existing gluing process, the hot melt adhesive is easily adhered to the first punching needle B3 during the punching process because the first punching needle B3 has a certain temperature, which causes the non-woven fabric at the tail end of the through hole d to be pulled back to the top of the through hole d when the first punching needle B3 is withdrawn from the composite part, forming a poor opening such as a pulled hole or a blind hole. In this embodiment 3, the design of the concave grid texture C13 of the composite roller C can guide the excess hot melt adhesive during the operation of the device, and the adhesive amount is evenly distributed, which also reduces the phenomenon of hot melt adhesive bonding to the punching needle B3, effectively reducing the downtime and maintenance time caused by adhesion problems, thereby greatly improving the production speed and efficiency, and improving the feel of the final product. Of course, ultrasonic bonding can also be used to increase the composite strength and prevent the risk of pulling back during the composite process of the upper non-woven fabric and the lower non-woven fabric. At the same time, the plurality of through holes d in the micro-embossed area 4 can further accelerate the body fluid penetration rate of the composite part, thereby improving the absorbency and use comfort of the composite non-woven fabric.

[0031] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A composite nonwoven fabric, characterized in that: The composite nonwoven fabric comprises an upper nonwoven fabric and a lower nonwoven fabric; The composite nonwoven fabric has a raised area and a micro-embossed area; The protrusions of the protrusion area have an inner space between the upper nonwoven fabric and the lower nonwoven fabric; The micro-relief area is located at the composite part where the upper non-woven fabric and the lower non-woven fabric are in contact, and the micro-relief area has a concave-convex texture, and the height of the concave-convex texture is 0.2 mm to 1.0 mm; The height difference between the raised area and the micro-relief area is 0.5 mm to 3 mm.

2. A composite nonwoven fabric according to claim 1, characterized in that: The upper nonwoven fabric is a hot air nonwoven fabric, a spunbond nonwoven fabric or a spunlace nonwoven fabric; the lower nonwoven fabric is a hot air nonwoven fabric, a spunbond nonwoven fabric or a spunlace nonwoven fabric.

3. A composite nonwoven fabric according to claim 1, characterized in that: The protrusions in the protrusion area are provided with a plurality of openings communicating with the internal space.

4. A composite nonwoven fabric according to claim 1, characterized in that: The concavo-convex texture of the micro-relief area is a stripe texture, a discretely distributed dot texture or a grid texture.

5. The composite nonwoven fabric according to claim 1, characterized in that: The micro-relief area has a plurality of through holes penetrating the composite non-woven fabric.

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

7. A method for manufacturing a composite nonwoven fabric, characterized in that: The main production steps include: (1) The upper nonwoven fabric enters the embossing device; Wherein: the embossing device comprises an embossing convex roller and a concave roller; the embossing convex roller is meshed with the concave roller, wherein: the embossing convex roller is provided with a plurality of embossing protrusions, and the concave roller is provided with depressions corresponding to the embossing protrusions on the embossing convex roller; during operation, the upper non-woven fabric enters between the embossing convex roller and the concave roller, and the heated embossing convex roller squeezes the fibers of the upper non-woven fabric into the depressions of the concave roller, and at the same time, the non-depressed part of the concave roller squeezes the fibers between the embossing protrusions of the embossing convex roller, and the fiber surface is melted, consolidated and shaped, so that a concave-convex structure is formed on the surface of the upper non-woven fabric and coated on the embossing convex roller and transported to the composite device, wherein: the convex part of the upper non-woven fabric is coated on the convex part of the embossing convex roller, and the concave part of the upper non-woven fabric is located between the embossing protrusions of the embossing convex roller; (2) The upper nonwoven fabric is embossed in step (1) and then enters a composite device to be composited with the lower nonwoven fabric; The composite device is a composite roller meshed with an embossed convex roller, and the surface of the composite roller has a concave-convex texture structure; during operation, the upper non-woven fabric and the lower non-woven fabric enter the composite device, and are heated and extruded through the concave-convex texture structure on the surface of the composite roller, and the convex part of the upper non-woven fabric is composited with the lower non-woven fabric to form a micro-embossed area of ​​the composite non-woven fabric, and the concave part of the upper non-woven fabric forms a convex area of ​​the composite non-woven fabric with an internal space with the lower non-woven fabric, thereby forming a composite non-woven fabric with a convex area and a micro-embossed area.

8. The method for manufacturing a composite nonwoven fabric according to claim 7, characterized in that: The embossing convex roller is provided with punching needles whose height is lower than the height of the embossing protrusions, and the concave roller is provided with concave holes corresponding to the punching needles on the embossing convex roller.

9. The method for manufacturing a composite nonwoven fabric according to claim 7, characterized in that: The embossing protrusions of the embossing roller are provided with punching needles, and the composite roller is provided with concave holes corresponding to the punching needles on the embossing roller.

10. The method for manufacturing a composite nonwoven fabric according to claim 7, characterized in that: The concave-convex texture structure on the composite roller is a concave line texture structure, a convex discretely distributed dot texture structure or a concave grid texture structure.

11. The method for manufacturing a composite nonwoven fabric according to claim 7, characterized in that: The upper non-woven fabric and the lower non-woven fabric are composited by hot melt adhesive or ultrasonic welding.

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