A soft and dry double-layer composite material, and a preparation device and method thereof, and a sanitary product

Abstract

The application discloses a soft and dry double-layer composite material, which comprises a bottom layer and a surface layer arranged on the upper portion of the bottom layer, wherein the surface layer has an upper surface and a lower surface, the surface layer is provided with an opening penetrating through the surface layer, the bottom layer is provided with a first protruding portion protruding upward, the first protruding portion penetrates through the opening, the top surface of the first protruding portion is higher than the plane where the upper surface of the surface layer is located, and the fiber fineness of the bottom layer is smaller than that of the surface layer. The application can provide a good soft and comfortable experience for users and improve the dryness of the material.

Description

Technical Field

[0001] This invention belongs to the field of double-layer composite material technology, specifically relating to a soft and dry double-layer composite material and its preparation apparatus, method, and sanitary products. Background Technology

[0002] Absorbent hygiene products, as daily necessities, encompass sanitary napkins, diapers, pull-ups, adult diapers, adult pull-ups, products for mild incontinence, nursing pads, and absorbent pads, bringing great convenience to people's lives. Taking sanitary napkins as an example, the market penetration rate of sanitary napkins in China is currently almost 100%, meaning that almost every consumer who menstruates is already using sanitary napkins. As of this year, the market penetration rate of baby diapers and pull-ups has also reached approximately 80%, and this market penetration rate is expected to continue to increase in the coming years.

[0003] As a fabric, in order to meet consumers' growing pursuit of comfort and softness, more and more materials use finer fibers to make fabrics. At the same time, in order to pursue dryness, weakly hydrophilic fibers are often used or weakly hydrophilic finishing is performed after the fabric is made. Using weakly hydrophilic treatment will help reduce the backflow caused by the liquid in the core seeping through the fabric when under pressure. However, these two trends have encountered difficulties at present, and it is not possible to achieve both fineness and softness and dryness. The reason is: (1) Fine fibers will help improve softness and comfort, especially when the fabric is dry. However, as an absorbent product, the reduction in fineness will also greatly increase the number of fibers per unit area. (1) Reducing the gaps between fibers will decrease the fluffiness of the fabric. When the fabric absorbs liquid, the smaller gaps will slow down the liquid seepage rate, increase the liquid storage in the fabric, thereby increasing the liquid holding capacity and liquid holding rate of the surface layer, further affecting the moisture feel and rewetting amount of the fabric, affecting the dryness of the fabric and the comfort experience of consumers; (2) Weak hydrophilic treatment will reduce the hydrophilicity of fibers and fabric, and the time for liquid to penetrate the fabric will be longer. At the same time, a situation similar to the lotus leaf effect will occur, where the liquid cannot seep down, forming slippage and side leakage problems, affecting the function of absorbent products and the user experience of consumers. The leakage problem will also bring a lot of trouble to consumers, such as staining underwear or bed sheets.

[0004] A single fabric made by simply mixing and adjusting the proportions of coarse and fine denier fibers can only improve dryness and comfort to a limited extent, but cannot significantly improve or resolve the contradiction and balance between the two.

[0005] Another trend is that more and more fabrics are made of natural concept fibers such as spunlace cotton or spunlace viscose. However, because these cotton-like materials have the characteristics of absorbing and retaining water, they cannot achieve good dryness. Therefore, it is necessary to study an innovative fabric that can solve the problem of dryness. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a soft and dry double-layer composite material, its preparation apparatus, method, and sanitary products, which simultaneously ensures the fabric's dryness and softness against the skin.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A soft and dry double-layer composite material includes a bottom layer and a top layer disposed on the top layer. The top layer has an upper surface and a lower surface. An opening is provided on the top layer. The bottom layer has an upwardly protruding first protrusion that penetrates the opening. The top surface of the first protrusion extends beyond the plane of the upper surface of the top layer. The fiber fineness of the bottom layer material is smaller than that of the top layer material.

[0009] Preferably, the hydrophilicity of the bottom layer material is weaker than that of the top layer material.

[0010] Preferably, the aforementioned surface layer has a second protrusion, and the opening is located on the top surface of the second protrusion.

[0011] Preferably, the sidewall of the first protrusion located in the second protrusion is fully, partially, or not attached to the inner wall of the second protrusion to form a cavity.

[0012] Preferably, the aforementioned surface layer is provided with a second protrusion, the opening is located on the surface layer other than the second protrusion, and the top surface of the second protrusion is lower than the top surface of the first protrusion.

[0013] Preferably, at least a portion of the aforementioned upper surface of the bottom layer and lower surface of the top layer are bonded and fixed together.

[0014] Preferably, the aforementioned first protrusion is provided with a bottom layer hole that penetrates the bottom layer.

[0015] Preferably, the aforementioned second protrusion is provided with a surface hole that penetrates the surface layer;

[0016] Preferably, the aforementioned bottom layer and top layer are respectively provided with a first through hole and a second through hole penetrating the bottom layer and the top layer at the bonding point, the first through hole and the second through hole are connected, and the first through hole and the second through hole have the same or different sizes.

[0017] The present invention also provides an apparatus for preparing a soft and dry double-layer composite material, comprising a first roller, a second roller, a concave roller, and an adhesive mechanism;

[0018] The surface of the first roller is provided with a plurality of first opening elements for making openings;

[0019] The concave roller cooperates with the first roller, and its roller surface is provided with a plurality of second opening parts that cooperate with the first opening part. The second opening parts and the first opening parts cooperate to form a plurality of openings that penetrate the surface layer on the surface layer.

[0020] The second roller cooperates with the concave roller. The roller surface is provided with a plurality of first protrusions for pressing out the first protrusions on the bottom layer. The roller surface of the concave roller is provided with a plurality of first grooves that cooperate with the first protrusions. The first grooves and the first protrusions cooperate to form a plurality of first protrusions that penetrate the surface holes on the bottom layer.

[0021] The adhesive mechanism is used to bond the contact points of the upper surface of the substrate and the lower surface of the top layer together.

[0022] Preferably, the roller surface of the first roller is provided with a plurality of second bosses for pressing the second protrusions on the surface, and the roller surface of the concave roller is provided with a plurality of second grooves that cooperate with the second bosses. The second grooves and the second bosses cooperate to form a plurality of second protrusions on the surface.

[0023] The present invention also provides a method for preparing a soft and dry bilayer composite material, and provides the aforementioned apparatus for preparing the soft and dry bilayer composite material;

[0024] The specific steps include the following:

[0025] S1. The surface layer is conveyed between the concave roller and the first roller, and a number of openings through the surface layer are formed by the cooperation of the first opening member and the second opening member.

[0026] S2. The surface layer is conveyed between the concave roller and the second roller, and a number of first protrusions through the surface layer are formed on the bottom layer by the cooperation of the first groove and the first boss.

[0027] S3, the surface layer and the bottom layer continue to be transported forward and compounded to form a two-layer composite material.

[0028] The present invention also provides another method for preparing a soft and dry bilayer composite material, and provides the aforementioned apparatus for preparing the soft and dry bilayer composite material;

[0029] The specific steps include the following:

[0030] S1. The surface layer is conveyed between the concave roller and the first roller, and a number of second protrusions are formed on the surface layer by the cooperation of the second groove and the second boss. At the same time, a number of openings penetrating the surface layer are formed on the second protrusions by the cooperation of the first opening member and the second opening member.

[0031] S2. The bottom layer is conveyed between the concave roller and the second roller, and a first protrusion is formed on the bottom layer by the cooperation of the first groove and the first boss, which have several small holes penetrating the surface layer.

[0032] S3, the surface layer and the bottom layer continue to be transported forward and compounded to form a two-layer composite material.

[0033] The present invention also provides a hygiene product comprising the aforementioned soft and dry double-layer composite material.

[0034] Preferably, the aforementioned hygiene products include sanitary napkins, panty liners, period panties, products for minor incontinence, diapers, pull-up pants, nursing pads, maternity pads, or breast pads. Beneficial effects

[0035] The double-layer composite material of this invention combines coarse denier fiber material and fine denier fiber material, with the coarse denier fiber material being lower in height than the fine denier fiber material. This allows the fine denier fiber material to come into contact with the user's skin, thereby providing the user with a maximum soft and comfortable experience. It avoids the coarse denier fiber material coming into contact with the user's skin, solving the problem of softness and skin-friendliness of coarse denier fabrics. At the same time, the dryness of coarse denier fabrics also effectively solves the dryness problem of fine denier fiber materials, thus improving the dryness of the fabric while ensuring a soft and comfortable experience. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a double-layer composite material according to an embodiment of the present invention;

[0037] Figure 2 yes Figure 1 Cross-sectional view of section AA;

[0038] Figure 3 This is a schematic diagram of the structure of a double-layer composite material according to another embodiment of the present invention;

[0039] Figure 4 yes Figure 3 Cross-sectional view of section BB;

[0040] Figure 5 This is a schematic diagram of the structure of a double-layer composite material according to another embodiment of the present invention;

[0041] Figure 6 yes Figure 5 Cross-sectional view of the CC section;

[0042] Figure 7 This is a schematic diagram of the structure of a double-layer composite material according to another embodiment of the present invention;

[0043] Figure 8 yes Figure 7 Cross-sectional structural diagram at point DD;

[0044] Figure 9 This is a schematic diagram of the structure of a double-layer composite material according to another embodiment of the present invention;

[0045] Figure 10 yes Figure 9 Cross-sectional view of the EE section;

[0046] Figure 11 This is a schematic diagram of the structure of a double-layer composite material preparation device according to an embodiment of the present invention;

[0047] Figure 12 This is a schematic diagram of the structure of a double-layer composite material preparation device according to another embodiment of the present invention;

[0048] Figure 13 This is a schematic diagram of the structure of a double-layer composite material according to another embodiment of the present invention;

[0049] Figure 14 This is a schematic diagram of the structure of a double-layer composite material according to another embodiment of the present invention;

[0050] Figure 15 This is a schematic diagram of the structure of a double-layer composite material according to another embodiment of the present invention.

[0051] The meanings of the reference numerals in the figure are as follows: 1. Bottom layer, 1.1. First protrusion, 1.2. Bottom layer hole, 1.3. First through hole; 2. Surface layer, 2.1. Opening, 2.2. Second protrusion, 2.3. Surface layer hole, 2.4. Second through hole; 3. First roller, 3.1. First opening component, 3.2. Second boss; 4. Second roller, 4.1. First boss; 5. Concave roller, 5.1. Second opening component, 5.2. First groove, 5.3. Second groove; 6. Adhesive mechanism. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Example 1

[0053] See Figure 1 and Figure 2 The present invention discloses a soft and dry double-layer composite material, comprising a bottom layer 1 and a top layer 2 disposed on the upper part of the bottom layer 1. The top layer 2 is provided with a plurality of openings 2.1 penetrating the top layer 2. The bottom layer 1 is provided with a plurality of upwardly protruding first protrusions 1.1, the first protrusions 1.1 corresponding to the openings 2.1 and penetrating the openings 2.1. The contact points of the upper surface of the bottom layer 1 and the lower surface of the top layer 2 are bonded together. The upper surface of the first protrusions 1.1 is higher than the upper surface of the top layer 2. The bottom layer 1 is made of fine denier fibers, and the top layer 2 is made of coarse denier fibers. The hydrophilicity of the bottom layer 1 is weaker than that of the top layer 2.

[0054] With this structure, the non-woven fabric used in the top layer 2 has a large fiber fineness, so it can exhibit good water permeability and breathability, as well as good water retention properties, effectively controlling backflow; the bottom layer 1 fabric has a smaller fiber fineness, and after it protrudes from the overall fabric through the openings of the top layer 2, it comes into direct contact with the skin. Due to its smaller fiber fineness and weak hydrophilicity, it exhibits good skin-friendliness, softness and dryness during use.

[0055] The bonding area between the surface layer 2 and the bottom layer 1 can be formed by bonding the unopened area of ​​the surface layer 2 to the non-protruding area of ​​the bottom layer 1; the bonding point can be the entire contact area or a part of the contact area.

[0056] The bottom layer 1 is made of 24 g / m² 1.0 denier weak affinity fiber hot air nonwoven fabric, and the top layer 2 is made of 20 g / m² 2.5 denier strong affinity fiber hot air nonwoven fabric. The height of the first protrusion 1.1 on the bottom layer 1 is 1.2 mm, the diameter of the first protrusion 1.1 is 6 mm, and the first protrusion 1.1 is provided with bottom layer small hole 1.2 with a diameter of 1 mm; the diameter of the opening 2.1 on the top layer 2 is 7 mm.

[0057] Preferably, both the top layer 2 and the bottom layer 1 are made of hot air nonwoven fabric. The upper surface of the bottom layer 1 has a more delicate feel and finer fibers than the upper surface of the top layer 2. The bottom layer 1 is made of pure cotton, while the top layer 2 is made of two-component hot air. The colors of the top layer 2 and the bottom layer 1 are different, for example, the bottom layer 1 is white and the top layer 2 is light green.

[0058] Preferably, the bonding between the upper surface of the bottom layer 1 and the lower surface of the top layer 2 is achieved by heat bonding, adhesive bonding or ultrasonic bonding.

[0059] See Figure 11 In this embodiment, a preparation apparatus for a soft and dry double-layer composite material is also provided, including a first roller 3, a second roller 4, a concave roller 5, and an adhesive mechanism 6; the roller surface of the first roller 3 is provided with a plurality of first perforation elements 3.1 for forming openings 2.1; the concave roller 5 cooperates with the first roller 3, and its roller surface is provided with a plurality of second perforation elements 5.1 that cooperate with the first perforation elements, the second perforation elements 5.1 and the first perforation elements 3.1 cooperate to form a plurality of openings 2 penetrating the surface layer 2 on the surface layer 2. 1; The second roller 4 cooperates with the concave roller 5, and its roller surface is provided with a plurality of first bosses 4.1 for pressing the first protrusion 1.1 on the bottom layer 1. The roller surface of the concave roller 5 is provided with a plurality of first grooves 5.2 that cooperate with the first bosses 4.1. The first grooves 5.2 and the first bosses 4.1 cooperate to form a plurality of first protrusions 1.1 that penetrate the openings 2.1 of the surface layer 2 on the bottom layer 1; The adhesive mechanism 6 is used to bond the contact points of the upper surface of the bottom layer 1 and the lower surface of the surface layer 2 together.

[0060] In this embodiment, the preparation method of the soft and dry double-layer composite material includes the following specific steps:

[0061] S1. The surface layer 2 is conveyed between the concave roller 5 and the first roller 3. The first opening part 3.1 and the second punching part 5.1 cooperate to form a number of openings 2.1 through the surface layer 2. At the same time, adhesive is applied to the lower surface of the surface layer 2 that is in contact with the upper surface of the bottom layer 1.

[0062] S2. The bottom layer 1 is conveyed between the concave roller 5 and the second roller 4, and the first groove 5.2 and the first boss 4.1 cooperate to form a plurality of first protrusions 1.1 on the bottom layer 1 that penetrate the openings 2.1 of the surface layer 2;

[0063] S3, surface layer 2 and bottom layer 1 continue to be conveyed forward and compounded to form a double-layer composite material. Example 2

[0064] See Figures 3-4 The present invention provides a soft and dry double-layer composite material, comprising a bottom layer 1 and a top layer 2 disposed on the top of the bottom layer 1. The top layer 2 is provided with a plurality of upwardly protruding second protrusions 2.2 and a plurality of openings 2.1 penetrating the top layer 2. The bottom layer 1 is provided with a plurality of upwardly protruding first protrusions 1.1, the first protrusions 1.1 corresponding to the openings 2.1 and penetrating the openings 2.1. The outer side of the openings 2.1 is bonded to the lower surface of the top layer 2.

[0065] The height of the top surface of the second protrusion 2.2 is higher than the height of the top surface of the first protrusion 1.1, so that the second protrusion 2.2 directly contacts the skin. The material of the surface layer 2 is a non-woven fabric made of fine denier and weakly hygroscopic fibers; at the same time, the bottom layer 1 is made of coarse denier fabric. When the second protrusion 2.2 of the surface layer 2 comes into contact with the skin, it has a dry and soft effect. The first protrusion 1.1 formed on the bottom layer 1 has better anti-backflow and water retention advantages. When it forms a protruding cavity, it makes the overall water retention performance of the fabric better and improves the fluffiness of the fabric.

[0066] The top layer 2 uses 23gsm diluted menstrual blood nonwoven fabric, the bottom layer 1 uses 20gsm hot air repeated hydrophilic nonwoven fabric, and the diameter of the opening 2.1 is 7 mm.

[0067] Preferably, the height of the upper surface of the first protrusion 1.1 is lower than the upper surface of the second protrusion 2.2. The surface layer 2 is made of fine denier fibers, and the bottom layer 1 is made of coarse denier fibers. The hydrophilicity of the surface layer 2 is weaker than that of the bottom layer 1. The surface layer 2 is made of hot-air nonwoven fabric of 22 g / m² 0.8 denier weakly hydrophilic antibacterial fiber, and the bottom layer 1 is made of hot-air nonwoven fabric of 22 g / m² 3.0 denier light green strongly hydrophilic fiber. The height of the second protrusion 2.2 on the surface layer 2 is 1.5 mm, and the diameter is 6 mm; the height of the first protrusion 1.1 on the bottom layer 1 is 0.8 mm, see... Figure 3 and Figure 4 .

[0068] See Figure 5 and Figure 6 The upper surface of the first protrusion 1.1 is higher than the upper surface of the second protrusion 2.2, and the fabric materials of the bottom layer 1 and the top layer 2 are the same. Figure 3 and Figure 4 Conversely, the bottom layer 1 is made of fine denier fibers, while the top layer 2 is made of coarse denier fibers. The bottom layer 1 has weaker hydrophilicity than the top layer 2. The bottom layer 1 is made of pure cotton spunlace nonwoven fabric with 30 g / m² pure cotton fibers, while the top layer 2 is made of hot-air nonwoven fabric with 22 g / m² 2.0 denier fibers. The first protrusion 1.1 on the bottom layer 1 has a height of 1.3 mm and a diameter of 6 mm; the second protrusion 2.2 on the top layer 2 has a height of 0.6 mm and a diameter of 6 mm.

[0069] Preferably, the shape and size of the opening 2.1, the first protrusion 1.1, and the second protrusion 2.2 can be changed as needed.

[0070] See Figure 12In this embodiment, a preparation apparatus for a soft and dry double-layer composite material is also provided, including a first roller 3, a second roller 4, a concave roller 5, and an adhesive mechanism 6; the roller surface of the first roller 3 is provided with a plurality of first perforation elements 3.1 for forming openings 2.1; the concave roller 5 cooperates with the first roller 3, and its roller surface is provided with a plurality of second perforation elements 5.1 that cooperate with the first perforation elements, the second perforation elements 5.1 and the first perforation elements 3.1 cooperate to form a plurality of openings 2 penetrating the surface layer 2 on the surface layer 2. 1; The second roller 4 cooperates with the concave roller 5. The roller surface of the second roller 4 is provided with multiple first bosses 4.1 for pressing first protrusions 1.1 onto the bottom layer 1. The roller surface of the concave roller 5 is provided with multiple first grooves 5.2 that cooperate with the first bosses 4.1. The first grooves 5.2 and the first bosses 4.1 cooperate to form multiple first protrusions 1.1 penetrating the openings 2.1 of the surface layer 2 on the bottom layer 1. The adhesive mechanism 6 is used to bond the contact points of the upper surface of the bottom layer 1 and the lower surface of the surface layer 2 together. The roller surface of the first roller 3 is provided with multiple second bosses 3.2 for pressing second protrusions 2.2 onto the surface layer 2. The roller surface of the concave roller 5 is provided with multiple second grooves 5.3 that cooperate with the second bosses 3.2. The second grooves 5.3 and the second bosses 3.2 cooperate to form multiple second protrusions 2.2 on the surface layer 2.

[0071] In this embodiment, the preparation method of the soft and dry double-layer composite material includes the following specific steps:

[0072] S1. The surface layer 2 is conveyed between the concave roller 5 and the first roller 3. The second groove 5.3 and the second protrusion 3.2 cooperate to form a plurality of second protrusions 2.2 on the surface layer 2. At the same time, the first opening member 3.1 and the second punching member 5.1 cooperate to form a plurality of openings 2.1 penetrating the surface layer 2 on the recessed portion 2.3.

[0073] S2. The bottom layer 1 is conveyed between the concave roller 5 and the second roller 4, and the first groove 5.2 and the first boss 4.1 cooperate to form a plurality of first protrusions 1.1 on the bottom layer 1 that penetrate the openings 2.1 of the surface layer 2;

[0074] S3, surface layer 2 and bottom layer 1 continue to be conveyed forward and compounded to form a double-layer composite material. Example 3

[0075] See Figures 7-8This invention discloses a soft, dry, double-layer composite material, comprising a bottom layer 1 and a top layer 2 disposed on the upper part of the bottom layer 1. The top layer 2 has a plurality of upwardly protruding second protrusions 2.2. Each second protrusion 2.2 has an opening 2.1 penetrating through it. The bottom layer 1 has a plurality of upwardly protruding first protrusions 1.1, each corresponding to an opening 2.1 and penetrating through it. The outer side of the opening 2.1 is bonded to the lower surface of the top layer 2. The upper surface of the first protrusions 1.1 is higher than the upper surface of the top layer 2. The bottom layer 1 is made of fine denier fibers, and the top layer 2 is made of coarse denier fibers. The bottom layer 1 has weaker hydrophilicity than the top layer 2.

[0076] Preferably, the sidewall of the first protrusion 1.1 is bent, and at least a portion of it is in contact with the inner wall of the second protrusion 2.2. This method improves the overall three-dimensional retention of the fabric by enhancing the adhesion of the sidewall. More preferably, the entire sidewall of the first protrusion 1.1 located inside the second protrusion 2.2 is in contact with and bonded to the inner wall of the second protrusion 2.2.

[0077] Preferably, the lower surface of the second protrusion 2.2 outside the opening 2.1 corresponds in shape to the upper surface of the lower part of the first protrusion 1.1, and they are bonded together. In the vertical cross-section of the first protrusion 1.1, the length of its upper half is less than the length of its lower half. Figure 7 and Figure 8 .

[0078] See Figure 9 and Figure 10 The sidewall of the first protrusion 1.1 is not bent and forms a cavity between it and the inner wall of the second protrusion 2.2. When this structure is adopted, the overall fluffiness and water retention and seepage prevention of the fabric can be improved by utilizing the formed cavity. Preferably, the sidewall of the first protrusion 1.1 is a vertical surface perpendicular to the upper surface of the bottom layer 1.

[0079] In this embodiment, a preparation apparatus for a soft and dry double-layer composite material is also provided, including a first roller 3, a second roller 4, a concave roller 5, and an adhesive mechanism 6; the roller surface of the first roller 3 is provided with a plurality of first opening elements 3.1 for forming openings 2.1; the concave roller 5 cooperates with the first roller 3, and its roller surface is provided with a plurality of second perforating elements 5.1 that cooperate with the first opening elements 3.1, the second perforating elements 5.1 and the first opening elements 3.1 cooperate to form a plurality of openings 2 penetrating the surface layer 2 on the surface layer 2. 1; The second roller 4 cooperates with the concave roller 5. The roller surface of the second roller 4 is provided with multiple first bosses 4.1 for pressing first protrusions 1.1 onto the bottom layer 1. The roller surface of the concave roller 5 is provided with multiple first grooves 5.2 that cooperate with the first bosses 4.1. The first grooves 5.2 and the first bosses 4.1 cooperate to form multiple first protrusions 1.1 penetrating the openings 2.1 of the surface layer 2 on the bottom layer 1. The adhesive mechanism 6 is used to adhesively connect the contact points of the upper surface of the bottom layer 1 and the lower surface of the surface layer 2 together. The roller surface of the first roller 3 is provided with multiple second bosses 3.2 for pressing second protrusions 2.2 onto the surface layer 2. The roller surface of the concave roller 5 is provided with multiple second grooves 5.3 that cooperate with the second bosses 3.2. The second grooves 5.3 and the second bosses 3.2 cooperate to form multiple second protrusions 2.2 on the surface layer 2.

[0080] In this embodiment, the preparation method of the soft and dry double-layer composite material includes the following specific steps:

[0081] S1. The surface layer 2 is conveyed between the concave roller 5 and the first roller 3. The second groove 5.3 and the second boss 3.2 cooperate to form a plurality of second protrusions 2.2 on the surface layer 2. At the same time, the first opening member 3.1 and the second punching member 5.1 cooperate to form a plurality of openings 2.1 penetrating the surface layer 2 on the second protrusions 2.2.

[0082] S2. The bottom layer 1 is conveyed between the concave roller 5 and the second roller 4, and the first groove 5.2 and the first boss 4.1 cooperate to form a plurality of first protrusions 1.1 on the bottom layer 1 that penetrate the openings 2.1 of the surface layer 2;

[0083] S3, surface layer 2 and bottom layer 1 continue to be conveyed forward and compounded to form a double-layer composite material. Example 4

[0084] To further enhance water and air permeability, small holes can be created in the bottom and top layers of the double-layer composite fabric in this patent, such as... Figure 13 As shown, a small hole 1.2 is provided on the first protrusion 1.1; alternatively, holes can be made on the surface, such as... Figure 14 As shown, surface holes 2.3 are provided on the second protrusion 2.2; simultaneously, through holes can be provided on the bottom layer 1 and the surface layer 2, such as... Figure 15As shown, a first through hole 1.3 and a second through hole 2.4 are respectively provided at the joint between the bottom layer 1 and the top layer 2. The first through hole 1.3 and the second through hole 2.4 are connected, and the first through hole 1.3 and the second through hole 2.4 have the same or different dimensions.

[0085] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A soft, dry, double-layer composite material, characterized in that, The material includes a bottom layer (1) and a top layer (2) disposed on the top of the bottom layer (1). The top layer (2) has an upper surface and a lower surface. An opening (2.1) is provided on the top layer (2) through the top layer (2). The bottom layer (1) is provided with a first protrusion (1.1) protruding upward. The first protrusion (1.1) penetrates the opening (2.1). The top surface of the first protrusion (1.1) extends beyond the plane where the upper surface of the top layer (2) is located. The fiber fineness of the bottom layer (1) material is less than that of the top layer (2) material. The hydrophilicity of the bottom layer (1) material is weaker than that of the surface layer (2) material; The surface layer (2) is provided with a second protrusion (2.2), and the opening (2.1) is located on the top surface of the second protrusion (2.2).

2. The soft and dry double-layer composite material according to claim 1, characterized in that, The side wall of the first protrusion (1.1) located in the second protrusion (2.2) is fully, partially, or not attached to the inner wall of the second protrusion (2.2) to form a cavity.

3. The soft and dry double-layer composite material according to claim 1, characterized in that, At least a portion of the upper surface of the bottom layer (1) and the lower surface of the top layer (2) are bonded and fixed together.

4. The soft and dry double-layer composite material according to claim 1, characterized in that, The first protrusion (1.1) is provided with a bottom hole (1.2) that penetrates the bottom layer (1).

5. The soft and dry double-layer composite material according to claim 1, characterized in that, The second protrusion (2.2) is provided with a surface hole (2.3) that penetrates the surface layer (2).

6. The soft, dry, double-layer composite material according to claim 1, characterized in that, The bottom layer (1) and the top layer (2) are respectively provided with a first through hole (1.3) and a second through hole (2.4) penetrating the bottom layer (1) and the top layer (2). The first through hole (1.3) and the second through hole (2.4) are connected, and the first through hole (1.3) and the second through hole (2.4) have the same or different dimensions.

7. An apparatus for preparing the soft, dry, double-layer composite material according to any one of claims 1-6, characterized in that, It includes a first roller (3), a second roller (4), a concave roller (5), and an adhesive mechanism (6); The first roller (3) has a plurality of first opening parts (3.1) for opening openings (2.1) on its roller surface. The concave roller (5) cooperates with the first roller (3), and a plurality of second opening parts (5.1) that cooperate with the first opening part (3.1) are provided on its roller surface. The second opening parts (5.1) and the first opening parts (3.1) cooperate to form a plurality of openings (2.1) that penetrate the surface layer (2) on the surface layer (2). The second roller (4) cooperates with the concave roller (5), and its roller surface is provided with a plurality of first bosses (4.1) for pressing out the first protrusion (1.1) on the bottom layer (1). The roller surface of the concave roller (5) is provided with a plurality of first grooves (5.2) that cooperate with the first bosses (4.1). The first grooves (5.2) and the first bosses (4.1) cooperate to form a plurality of first protrusions (1.1) that penetrate the surface layer (2) openings (2.1) on the bottom layer (1). The adhesive mechanism (6) is used to bond the contact points of the upper surface of the bottom layer (1) and the lower surface of the top layer (2) together; The first roller (3) has a plurality of second bosses (3.2) on its roller surface for pressing out second protrusions (2.2) on the surface layer (2). The concave roller (5) has a plurality of second grooves (5.3) on its roller surface that cooperate with the second bosses (3.2). The second grooves (5.3) and the second bosses (3.2) cooperate to form a plurality of second protrusions (2.2) on the surface layer (2).

8. A method for preparing a soft and dry double-layer composite material, characterized in that, An apparatus for preparing the soft, dry, bilayer composite material according to claim 7 is provided, comprising the following specific steps: S1. The surface layer (2) is conveyed between the concave roller (5) and the first roller (3), and a number of second protrusions (2.2) are formed on the surface layer (2) by the cooperation of the second groove (5.3) and the second boss (3.2). At the same time, a number of openings (2.1) penetrating the surface layer (2) are formed on the second protrusions (2.2) by the cooperation of the first opening (3.1) and the second opening (5.1). S2. The bottom layer (1) is conveyed between the concave roller (5) and the second roller (4), and a number of first protrusions (1.1) penetrating the openings (2.1) of the surface layer (2) are formed on the bottom layer (1) by the cooperation of the first groove (5.2) and the first boss (4.1). S3. The surface layer (2) and the bottom layer (1) continue to be conveyed forward and compounded to form a double-layer composite material.

9. A hygiene product, characterized in that, It includes the soft, dry, two-layer composite material as described in any one of claims 1 to 6.

10. The sanitary product according to claim 9, characterized in that, The sanitary products include sanitary napkins, panty liners, menstrual pants, diapers, pull-up pants, nursing pads, maternity pads, or breast pads.

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