Composite material, device for producing same, and absorbent article provided with same

Abstract

The invention relates to the technical field of layered fiber products, in particular to a composite material, a manufacturing device of the composite material and an absorption article with the composite material. The surface layer is provided with a plurality of bulges and recesses; sinking parts are arranged on the surface layer and the inner layer at the sunken parts; the sinking direction of the sinking part is opposite to the protruding direction of the protrusion. The sinking part is provided with a first combination part, and the first combination part is used for bonding the surface layer and the inner layer. The three-dimensional retentivity, the resilience, the non-deformability, the comfort and the attractiveness are all ideal. According to the invention, bonding areas are arranged at different heights. Meanwhile, multiple times of folding and calendering of the material in a limited space range are achieved through the sinking part, and the bonding force between layers is increased. And meanwhile, the sinking part can also solve the problem that the bonding area loses efficacy when the composite material is laterally pulled in the transverse direction. The vertical support is formed between the bonding layers through the sinking structure, so that the conduction space is increased while the contact area between the layers is reduced.

Description

[0001] This application claims the priority of the Chinese patent application with application number "2024100908392" filed with the State Intellectual Property Office of China on January 22, 2024 and invention name "Composite materials, manufacturing devices and absorbent products having the same", all contents of which are incorporated by reference in this application. Technical Field

[0002] The present invention relates to the technical field of layered fiber products, in particular to a composite material and a manufacturing device thereof and an absorbent article equipped with the composite material. Background Art

[0003] In products such as baby diapers, adult diapers, baby pant diapers, adult pant diapers, incontinence pads, protective napkins, sanitary napkins, sanitary pads, maternity napkins, breast pads, absorbent pads, dry towels or wipes, protrusions and depressions are processed on the fiber products to form patterns for the sake of aesthetics, breathability and dryness.

[0004] Chinese patent CN216514405U discloses a color discharge printed cotton and linen fabric, including a surface layer, one side of which is fixedly connected to a convex mesh, the area of ​​which is between one quarter and one half of the area of ​​the surface layer, and a number of evenly spaced recesses are formed between the convex mesh and the surface layer.

[0005] For another example, Chinese patent CN216473715U discloses a thick and comfortable polyester fabric, including a surface layer, a plurality of large contact parts are fixedly connected to one side of the surface layer, a plurality of recesses are formed between the large contact parts and the surface layer, and a plurality of small contact parts are fixedly connected to the surface layer at the recesses, the sum of the areas of the plurality of small contact parts is smaller than the area of ​​the large contact part, and is one fifth of the area of ​​the large contact part.

[0006] In the prior art, single-layer embossed perforated fiber products have a concave-convex cavity shape and a certain three-dimensional effect, but single-layer embossed perforated fiber products have the following defects: single-layer embossed fiber products have poor three-dimensional retention, and the thickness and spatial three-dimensional effect will be reduced when they are made into roll materials, especially when they are used to make diapers or sanitary napkins. The three-dimensional effect will be greatly reduced due to the process stretching and the use of glue to bond to other materials, which will further affect the breathability, dryness and aesthetics.

[0007] The existing double-layer composite fiber products have one layer made into a 3D hollow solid, and the other layer is glued as a support, which has the following defects: Under this structure, in order to solve the stratification problem between layers, glue is often applied on a large area on the glue-applied surface, that is, the lower surface of the bottom layer, so as to improve the bonding strength between layers. However, the hardening formed after the glue solidifies will reduce the softness of the material, and the excessive use of glue will also cause taste and color problems. Moreover, the three-dimensional effect of this structure still needs to be improved. Summary of the invention

[0008] To solve the above problems, an object of the present invention is to provide a composite material, a manufacturing device thereof and an absorbent article having the same.

[0009] The technical solution provided by the present invention is:

[0010] In a first aspect, a composite material comprises a surface layer and an inner layer arranged in layers; the surface layer is provided with a plurality of protrusions and depressions;

[0011] The surface layer and the inner layer of the depression are provided with sinking parts;

[0012] The sinking direction of the sinking portion is opposite to the protruding direction of the protrusion;

[0013] The sinking part is provided with a first joint, and the first joint is used for bonding the surface layer and the inner layer.

[0014] As an optional technical solution of the first aspect, the height difference between the upper end surface of the first joint and the bottom surface of the recess is H, where H≥0.01mm.

[0015] Optionally, the value range of H is 0.01-10.5 mm.

[0016] As an optional technical solution of the first aspect, when the composite material is laid flat, in the vertical direction, the ratio of the projected area of ​​the sunken portion to the projected area of ​​the recess is (0.01-1):1.

[0017] As an optional technical solution of the first aspect, a second bonding portion is provided on the surface layer and the inner layer of the recessed portion, and the second bonding portion and the first bonding portion jointly bond the surface layer and the inner layer.

[0018] Optionally, when the composite material is laid flat, in the vertical direction, the ratio of the projected area of ​​the second joint to the projected area of ​​the sinking portion is (0.1-10):1.

[0019] Furthermore, when the composite material is laid flat, in the vertical direction, the projection area of ​​the first joint accounts for 0.1%-50% of the projection area of ​​the composite material.

[0020] Optionally, the second joint is located at the root of the protrusion and / or at the non-sunken area of ​​the depression.

[0021] As an optional technical solution of the first aspect, the sunken portion is located in the central area of ​​the bottom surface of the depression, and the first joint is located in the central area of ​​the bottom surface of the sunken portion.

[0022] As an optional technical solution of the first aspect, the bottom surface area of ​​the sinking portion is larger than the bonding area of ​​the first joint.

[0023] As an optional technical solution of the first aspect, a plurality of openings are provided on the protrusion.

[0024] In a second aspect, a manufacturing device for manufacturing the above-mentioned composite material includes a roller set 1 for forming a plurality of protrusions and depressions on a surface layer; and also includes a roller set 2 for forming a sunken portion on the surface layer and the inner layer at the depression;

[0025] The sinking direction of the sunken part is opposite to the convex direction of the convex part;

[0026] The sinking part is provided with a first joint, and the first joint is used for bonding the surface layer and the inner layer.

[0027] As an optional technical solution of the second aspect, the roller set 1 includes a second roller and a first roller matched with the second roller; the roller set 2 includes a third roller matched with the second roller;

[0028] A first protrusion and a third concave cavity are provided on the roller surface of the first roller;

[0029] A first concave cavity is provided on the roller surface of the second roller corresponding to the first convexity, and a fourth convexity is provided corresponding to the third concave cavity;

[0030] The first protrusion and the first cavity are used to form a protrusion on the surface layer;

[0031] The third cavity and the fourth protrusion are used to form a depression on the surface layer;

[0032] A second protrusion is provided on the roller surface of the second roller, and a second cavity is provided on the roller surface of the third roller corresponding to the second protrusion; the second protrusion and the second cavity are used to form a sinking portion on the surface layer and the inner layer of the depression.

[0033] As an optional technical solution of the second aspect, a hole-opening needle is provided on the bottom surface of the first concave cavity, and a hole-opening needle cavity is provided on the first protrusion corresponding to the hole-opening needle; the hole-opening needle and the hole-opening needle cavity are used to form an opening on the protrusion.

[0034] Optionally, a third protrusion is further provided on the roller surface of the second roller, and a first pressing surface is provided on the roller surface of the third roller corresponding to the third protrusion; the third protrusion and the first pressing surface are used to form a second joint on the surface layer and the inner layer of the concave part;

[0035] The bottom surface of the second cavity is provided with a second pressing surface; the second protrusion is also used to form a first joint with the second pressing surface.

[0036] Optionally, a bonding device is provided before and / or after the second roller and the third roller cooperate with each other; the bonding device is used to form the first joint and the second joint.

[0037] Optionally, an ultrasonic generator is provided in the roller group 1 and / or the roller group 2, and the ultrasonic generator is used to form the first joint and the second joint.

[0038] The third aspect is an absorbent article, wherein one or more of the surface layer, guide layer, absorbent core, waist circumference, outer layer, three-dimensional guard, and waist patch of the absorbent article contains the composite material of the first aspect.

[0039] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0040] 1. The present application sets a sinking structure at the concave part, and sets the first joint in the sinking structure. Since the hardness of the first joint is higher than that of the material without the bonding area, the first joint can play a supporting role as a base, and the projection area of ​​the first joint accounts for 0.1%-50% of the projection area of ​​the composite material, and the angle between the inner side of the sinking part and the upper surface of the concave part is greater than 0° and not higher than 179°, that is, only part of the inner side of the composite material is provided with the first joint, and the rest is arched. The inclined surface of the sinking structure can make the material elastic and improve the elasticity of the material. In addition, the inclined surface of the sinking structure can increase the surface area of ​​the material per unit projection area, thereby increasing the area of ​​the material for filtering excrement. In addition, since the single protrusion structure is easy to collapse after absorbing moisture, the present application is not only provided with a protrusion, but also provided with a sinking structure to form a multi-layer structure, so that the three-dimensional retention of the present application is better. Moreover, the sinking structure is formed by pressing the surface and inner layer materials at the same time. The thickness and gram weight of the surface and inner layer materials are superimposed on each other to form the sinking structure, which is obviously superior to the structure formed by pressing a single layer of material in terms of three-dimensional maintenance.

[0041] 2. Since the first joint is arranged in the sinking part, the material forms a multiple folding and calendering structure from the edge line of the first joint to the direction away from the first joint. The stress at the edge line of the first joint can be eliminated through the multiple folding and calendering structures, thereby avoiding the material from cracking at the edge line of the first joint when the material is subjected to lateral side pulling, thereby solving the problem of failure of the bonding area. In addition, when the material is subjected to lateral side pulling, the multiple folding and calendering structures can also play an extension role, avoiding the first joint from being subjected to lateral pulling force for the first time, thereby avoiding the phenomenon of surface and inner layer delamination caused by the disconnection of the bonding point at this joint, that is, enhancing the interlayer bonding force.

[0042] 3. The present application designs a sinking structure in the sunken area to form a depression in the depression, which increases the vertical height of the material after it is formed, that is, the vertical storage space can be increased within the limited plane projection area, so that the product can increase the storage capacity of excrement and liquid. In addition, the sinking structure is provided, which can make the liquid collected by the sunken area quickly gather in the sinking structure, seep into the sinking structure and be absorbed by the absorbent material of the product, thereby realizing the functions of fixed-point collection and fixed-point absorption.

[0043] 4. The glued surface of the present application, i.e., the lower surface of the inner layer of the material, has a sinking structure, and the ratio of the projected area of ​​the sinking part to the projected area of ​​the depression is (0.01-1):1, which effectively reduces the contact area between the glued surface and the bonding surface after glue application. The sinking structure forms a vertical support between the bonding layers (the lower surface of the material and the bonding surface of other materials), thereby avoiding large-area contact between the inner layer and the bonding layer, reducing the contact area between the layers and increasing the circulation space. This can improve air permeability, absorption, and dryness, effectively manage the infiltration and flow of liquids and loose stools, help maintain dryness and reduce allergies. The raised and depressed parts of the present application appear alternately, and holes are opened on the raised parts, which can effectively reduce the contact area, increase air circulation, and improve air permeability.

[0044] 5. The sunken area of ​​the present application is designed with a sinking structure, forming a depression in a depression or a combination of depression bonding and depression bonding in a depression. The design of the interlayer structure increases a certain bonding strength or interlayer bonding strength. Different layer interfaces have different bonding levels. The bonding between different layers effectively avoids the visual and tactile effects of the bonding panels being knotted due to the excessive bonding area of ​​a single layer. While improving the softness of the material to a certain extent, it also increases the bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a cross-sectional view of a composite material structure in one embodiment of the present application;

[0046] Figure 2This is a schematic diagram of a composite material protrusion provided with an opening in one embodiment of the present application;

[0047] Figure 3 This is a schematic diagram of a composite material having a second joint in one embodiment of the present application;

[0048] Figure 4 A schematic diagram showing that a composite material is provided with a second joint in an embodiment of the present application, and the protrusion is in another shape;

[0049] Figure 5 This is a schematic diagram of an embodiment of the present application in which the composite material is provided with a second joint, and the protrusion is in another shape and is provided with an opening;

[0050] Figure 6 This is a top view of a composite material in one embodiment of the present application;

[0051] Figure 7 for Figure 6 Middle AA section view;

[0052] Figure 8 A top view of a composite material protrusion provided with an opening in one embodiment of the present application;

[0053] Fig. 9 for Figure 8 Middle BB section view;

[0054] Fig.10 This is a schematic diagram of the side angle of the sinking part in one embodiment of the present application;

[0055] Fig.11 This is a top view of a composite material in an embodiment of the present application when the protrusions are in various shapes;

[0056] Fig.12 This is a schematic diagram of a manufacturing device in one embodiment of the present application;

[0057] Fig.13 for Fig.12 Enlarged view of point A in the middle;

[0058] Fig.14 for Fig.12 Enlarged view of point B in the middle;

[0059] Fig.15 This is a schematic diagram of an embodiment of the present application in which the second roller is provided with a third protrusion;

[0060] Fig.16 for Fig.15 Enlarged view of point A in the middle;

[0061] Fig.17 for Fig.15 Enlarged view of point B in the middle;

[0062] Fig.18 This is a schematic diagram of an embodiment of the present application in which the second roller is provided with a third protrusion and a perforated needle;

[0063] Fig.19 for Fig.18 Enlarged view of point A in the middle;

[0064] Fig. 20 for Fig.18 Enlarged view of point B in the middle;

[0065] Fig.21 This is a schematic diagram of the location of the bonding device in one embodiment of the present application;

[0066] Fig. 22 This is a schematic diagram of the location of the bonding device in another embodiment of the present application;

[0067] Fig.23 This is a schematic diagram of an embodiment of the present application in which the bottom surface area of ​​the sinking portion is larger than the bonding area of ​​the first joint;

[0068] Fig.24 This is a schematic diagram of an embodiment of the present application in which the sinking portion is disposed at the center of the depression and the first joint is disposed at the center of the sinking portion;

[0069] Fig.25 This is a schematic diagram of an interlayer adhesion testing device in an embodiment of the present application.

[0070] Explanation of the symbols in the schematic diagram:

[0071] Surface layer 101, depression 102, protrusion 103, opening 104;

[0072] Inner layer 201, sinking part 202, first joint 203, second joint 204;

[0073] First roller 310, first protrusion 311, perforating needle cavity 312, third concave cavity 313, second roller 320, first concave cavity 321, second protrusion 322, third protrusion 323, perforating needle 324, fourth protrusion 325, third roller 330, second concave cavity 331, first pressing surface 332, second pressing surface 333, bonding device 340;

[0074] Stand 401 , upper fixed plate 402 , lower fixed plate 403 , tension display 404 , and upper pulling mechanism 405 . DETAILED DESCRIPTION

[0075] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0076] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0077] In one embodiment, the present application proposes a composite material, including a stacked surface layer 101 and an inner layer 201, wherein the surface layer 101 is closer to the user. A plurality of protrusions 103 and depressions 102 are provided on the surface layer 101. The top surface of the protrusion 103 can be a circular top surface or a flat top surface. Figure 1 The top surface of the protrusion 103 shown is a flat top surface. Figure 4 The top surface of the protrusion 103 is shown as an arc top surface. It should be noted that the top surface shape is not limited here, and the top surface shape of the protrusion 103 can also be other shapes, such as a wave shape.

[0078] like Fig.11 As shown, in the present application, the cross-sectional shape of the protrusion 103 is not limited, and the cross-sectional shape of the protrusion 103 can be various, such as a triangle, a star, a circle, etc.

[0079] There may be multiple protrusions 103, and the projection areas of adjacent protrusions 103 on the plane of the composite material may be the same or different. The heights of the protrusions 103 may also be the same or different, and the heights are 0.1-10 mm.

[0080] In one embodiment, the area of ​​the protrusion 103 is less than or equal to 400 square millimeters.

[0081] like Figure 6-7As shown, in this embodiment, a sinking portion 202 is provided on the surface layer 101 and the inner layer 201 at the depression 102. The sinking direction of the sinking portion 202 is opposite to the protruding direction of the protrusion 103, that is, the sinking portion 202 is located at the depression 102, and the sinking portion 202 and the protrusion 103 form a multi-layer depression structure. The absorbent article containing the composite material of the present application, due to the sinking structure designed in the depression area, has a plurality of layers of depressions while having the depression function, forming a depression in the depression. The depression area can effectively store excrement and liquid when the user uses it. The existence of the sinking structure can increase the physical storage space, so that the liquid collected by the depression area quickly gathers in the depression of the sinking structure, and infiltration is achieved in the depression of the sinking structure and absorbed by the absorbent material of the product, thereby realizing the functions of fixed-point collection and fixed-point absorption.

[0082] In this embodiment, the sinking part 202 is provided with a first joint 203, and the first joint 203 is used to bond the surface layer 101 and the inner layer 201. The bonding here includes bonding with glue and pressing. It can be said that the processing methods that can fix the surface layer 101 and the inner layer 201 together in the prior art belong to the bonding here. That is, in this embodiment, the surface layer 101 and the inner layer 201 are bonded to each other through the first joint 203 located in the sinking part 202.

[0083] It should be noted that the shape of the depression 102 relative to the plane projection of the composite material is point-shaped, line-shaped, surface-shaped or a combination thereof. The shape of the first joint 203 relative to the plane projection of the composite material is point-shaped, line-shaped, surface-shaped or a combination thereof. The shape of the sinking portion 202 relative to the plane projection of the composite material is point-shaped, line-shaped, surface-shaped or a combination thereof.

[0084] In this embodiment, the height difference between the upper end surface of the first joint 203 and the bottom surface of the recess 102 is H, where H≥0.01mm. Optionally, the value range of H is 0.01-10.5mm. That is, after the first joint 203 is machined in the sinking part 202, a concave space is still left in the sinking part 202, thereby forming a multi-level recess with the recess 102.

[0085] Since the first joint 203 is arranged in the sinking part 202, the material forms a multiple folding and calendering structure from the edge line of the first joint 203 to the direction away from the first joint 203. The stress at the edge line of the first joint can be eliminated through the multiple folding and calendering structures, thereby avoiding the phenomenon of the material cracking at the edge line of the first joint when the material is subjected to lateral side pulling, thereby solving the problem of failure of the bonding area. In addition, when the material is subjected to lateral side pulling, the multiple folding and calendering structures can also play an extension role, avoiding the first joint 203 from being subjected to lateral pulling force for the first time, thereby avoiding the phenomenon of the surface layer 101 and the inner layer 201 being delaminated due to the disconnection of the bonding point at this joint, that is, enhancing the interlayer bonding force.

[0086] Moreover, the present application designs a sinking structure in the concave area to form a concave in the concave, which increases the vertical height of the material after it is formed, that is, the vertical storage space can be increased within the limited plane projection area, so that the product can increase the storage capacity of excrement and liquid. In addition, the sinking structure is provided, so that the liquid collected by the concave area can be quickly gathered in the sinking structure, and infiltrated in the sinking structure and absorbed by the absorbent material of the product, thereby realizing the functions of fixed-point collection and fixed-point absorption.

[0087] When the composite material is laid flat, in the vertical direction, the ratio of the projected area of ​​the sinker 202 to the projected area of ​​the recess 102 is (0.01-1):1, such as 0.15:1, that is, the cross-sectional area of ​​the sinker 202 is smaller than the cross-sectional area of ​​the recess 102 .

[0088] The glued surface of the present application, i.e., the lower surface of the inner layer of the material, has a sinking structure, and the ratio of the projected area of ​​the sinking part to the projected area of ​​the depression is (0.01-1):1, which effectively reduces the contact area between the glued surface and the bonding surface after glue application. The sinking structure forms a vertical support between the bonding layers (the lower surface of the material and the bonding surface of other materials), thereby avoiding large-area contact between the inner layer and the bonding layer, reducing the contact area between the layers and increasing the circulation space. This can improve air permeability, absorption, and dryness, effectively manage the infiltration and flow of liquids and loose stools, help maintain dryness and reduce allergies. The raised and depressed parts of the present application appear alternately, and holes are opened on the raised parts, which can effectively reduce the contact area, increase air circulation, and improve air permeability.

[0089] In one embodiment, if Fig.10 As shown, the angle between the inner side surface of the sinking portion 202 and the upper surface of the recess 102 is greater than 0° and not higher than 179°.

[0090] The present application sets a sinking structure at the recessed part, and sets the first joint in the sinking structure. Since the hardness of the first joint is higher than that of the material without the bonding area, the first joint can play a supporting role as a base, and the projection area of ​​the first joint accounts for 0.1%-50% of the projection area of ​​the composite material, and the angle between the inner side surface of the sinking part 202 and the upper surface of the recess 102 is greater than 0° and not higher than 179°, that is, only part of the inner side of the composite material is provided with the first joint, and the rest is arched. The inclined surface of the sinking structure can make the material elastic and improve the elasticity of the material. In addition, the inclined surface of the sinking structure can increase the surface area of ​​the material per unit projection area, thereby increasing the area of ​​the material for filtering excrement. In addition, since the single protrusion structure is easy to collapse after absorbing moisture, the present application is not only provided with a protrusion 103, but also provided with a sinking part 202 to form a multi-layer structure, so that the three-dimensional retention of the present application is better. Moreover, the sinking structure is formed by pressing the surface and inner layer materials at the same time. The thickness and gram weight of the surface and inner layer materials are superimposed on each other to form the sinking structure, which is obviously superior to the structure formed by pressing a single layer of material in terms of three-dimensional retention.

[0091] In one embodiment, if Fig.24 As shown, the sinking part 202 is located in the center area of ​​the bottom surface of the depression 102, and the first joint 203 is located in the center area of ​​the bottom surface of the sinking part 202. When the sinking part 202 is located in the center area of ​​the bottom surface of the depression 102, the multiple folding and calendering structures of the sinking part 202 can be extended more evenly when the sinking part 202 is subjected to lateral side pulling in different directions, thereby avoiding failure of the bonding area. When the first joint 203 is located in the center area of ​​the bottom surface of the sinking part 202, the first joint 203 can better play the supporting role as the base, so that the three-dimensional retention of the material is better.

[0092] In one embodiment, if Fig.23 As shown, the bottom area of ​​the sinking portion 202 is larger than the bonding area of ​​the first joint 203, thereby avoiding the intersection of the inclined surface and the bottom surface of the sinking portion 202 being the edge line of the first joint 203, thereby avoiding what is called a stress concentration point, thereby avoiding failure of the bonding area.

[0093] In one embodiment, if Figure 3-5 As shown, a second joint 204 is provided on the surface layer 101 and the inner layer 201 at the recess 102. The second joint 204 and the first joint 203 jointly bond the surface layer 101 and the inner layer 201. The bonding here includes bonding with glue, ultrasonic composite molding, and pressing. It can be said that the processing methods in the prior art that can fix the surface layer 101 and the inner layer 201 together all belong to the bonding referred to here, and are not limited here.

[0094] In this embodiment, when the composite material is laid flat, in the vertical direction, the ratio of the projected area of ​​the second joint 204 to the projected area of ​​the sinking portion 202 is (0.1-10):1, such as 0.18:1, that is, the area of ​​the second joint 204 should not be too large to avoid affecting the softness of the composite material.

[0095] When the composite material is laid flat, in the vertical direction, the projection area of ​​the first joint 203 accounts for 0.1%-50% of the projection area of ​​the composite material, such as 27%, that is, the plane projection of the first joint 203 relative to the composite material should not be too large.

[0096] In one embodiment, the second joint 204 is located at the root area of ​​the protrusion 103, the second joint 204 may also be located at the non-sunken area of ​​the recess 102, or the second joint 204 may be provided at both the root area of ​​the protrusion 103 and the non-sunken area of ​​the recess 102.

[0097] By setting the first joint 203 and the second joint 204, the absorbent article containing the composite material of the present application can realize bonding areas at different heights. At the same time, the sinking part 202 realizes multiple folding and calendering of the material within a limited space, thereby increasing the bonding force between layers. At the same time, the sinking part 202 is set, and the first joint 203 is set in the sinking part 202. The tensile performance of the first joint 203 is improved by folding and calendering of the material, which can solve the problem of disconnection and failure of the interlayer bonding area caused by the composite material being subjected to lateral side pulling.

[0098] In one embodiment, if Figure 2 , 8 As shown in FIG. 9 , a plurality of openings 104 are provided on the protrusion 103 .

[0099] Figure 5 The diagram shown is a schematic diagram when the top surface of the protrusion 103 is in the shape of an arc top surface and the protrusion 103 is provided with an opening 104 .

[0100] The glued surface of the present application, i.e., the lower surface of the inner layer of the material, effectively reduces the contact area between the glued surface and the bonding surface after glue application due to the presence of the sinking structure, and forms a vertical support between the bonding layers (the lower surface of the material and the bonding surface of other materials) through the sinking structure, which reduces the contact area between the layers while increasing the conduction space. This can improve air permeability, absorption, and dryness, and can effectively manage the infiltration and flow of liquids and loose stools, which helps to keep dryness and reduce allergies. The protrusions 103 and depressions 102 of the present application appear alternately, and holes are opened on the protrusions 103, which can effectively reduce the contact area, increase air circulation, and improve air permeability.

[0101] The following are several experiments to test the performance of the composite material of the present application. First, the following Figure 8-9 The composite material of the present application is shown, and then a common composite material without the sinking portion 202 is made of the same material as a control.

[0102] Specifically, the surface layer 101 is a 20g 2 denier weakly hydrophilic hot air nonwoven fabric, the inner layer 201 is a 20g 3 denier strongly hydrophilic hot air nonwoven fabric, and the width of the recess 102 is 5 mm. When the upper end surface of the protrusion 103 is circular, its area is 17 square millimeters, the height of the protrusion 103 (i.e., the distance from the top surface of the protrusion 103 to the upper surface of the surface layer 101 in the non-sinking area of ​​the recess 102) is 0.9 mm, the number of openings 104 on each protrusion 103 is 7, the aperture of each opening 104 is 0.7 mm, the total height of the sinking part 202 is 0.45 mm, the diameter of the first joint 203 is 1.0 mm, and the diameter of the second joint 204 is 0.7 mm. The height difference H between the upper end surface of the first joint 203 and the bottom surface of the recess 102 is 0.3 mm.

[0103] Absorption speed comparison test: According to the national standard on the test method for diaper re-seepage, the composite material of the present application and the common composite material are placed on the same KSC standard diaper absorbent material, and 80 ml of saline is injected at one time. The absorption speed is indicated by observing how fast the liquid level of the saline in the measuring block drops. When the liquid level disappears completely, the absorption time (in seconds) is recorded; the smaller the number, the faster the absorption speed. The test data is shown in Table 1 below:

[0104] Table 1

[0105]

[0106] It can be seen from the above table that the absorption speed of the composite material of the present application is faster than that of two layers of ordinary composite materials.

[0107] Dryness test: In the experimental test, a press plate with a plane area of ​​100*100 and a weight of 0.5 kg and a standard weight of 5 kg of the same weight were pressurized on the press plate, respectively, and pressed on the composite material of the present application and the ordinary composite material of the control group, and placed at room temperature for 48 hours, and then the press plate and the standard weight were removed. After 24 hours, the dryness of the initial state (before pressure) and the change of dryness after pressure rebound were compared. Dryness is judged by the amount of rewetting. The lower the amount of rewetting, the better the dryness. The test method for dryness is to place the test surface material on the absorbent, pour 80 ml of physiological saline twice, with an interval of 5 minutes between the two times, and then place it for 1 minute, put 10 layers of standard filter paper on the surface layer, press on 2.5 kg of pressing blocks, press for one minute, test the weight change of the filter paper, and record the amount of rewetting in grams. The smaller the number, the lower the amount of rewetting and the better the dryness. It can be seen from the dryness comparison table 2 of the test results that the composite material of the present application is significantly better than the ordinary composite material.

[0108] Table 2

[0109]

[0110] Peel force test: In the test, the test standard adopts GB / T24218.3-2010 "Test methods for textile nonwovens" Part 3 Determination of breaking strength and breaking length (strip method). Take the composite material of the present application and the ordinary composite material of the control example, and make the number, position, and bonding area of ​​the bonding points of the composite material of the present application and the ordinary composite material the same, and the convex parts and concave parts provided are the same. The only difference is that the composite material of the present application is provided with a sinking structure, while the ordinary composite material is not provided with a sinking structure. The cut sample is 120mm away from the edge of the sample and is evenly distributed in the transverse and longitudinal directions of the sample. The sampling sample size is 100mm*25mm. The test is carried out in standard atmosphere, which is in accordance with the provisions of GB / T6529. Clamp the sample at the center of the clamp, and the pre-tension can be in accordance with the provisions of GB / T3923.1. The sample is stretched with a tensile tester at a constant extension speed of 300 mm / min until the material is delaminated. The tensile force is recorded as the interlayer adhesion force, which is regarded as the peeling force. The larger the value, the less likely the layers are to delaminate, and the lower the risk of delamination when the user wears it, and the more the product performance can be guaranteed. The test data is shown in Table 3:

[0111] Table 3

[0112]

[0113] As can be seen from Table 3, since the composite material of the present application is provided with a sinking structure, the multiple folded and calendered structure formed can play an extension role, avoiding the first joint from being subjected to lateral tension at the first time, thereby avoiding the phenomenon of stratification of the surface layer and the inner layer caused by the disconnection of the bonding point at this joint, that is, enhancing the interlayer bonding force, and the peeling force is greatly improved compared with the material without a sinking structure.

[0114] Interlayer adhesion test: The present application proposes an interlayer adhesion test device, including a stand 401, on which a lower fixed plate 403 is installed, and a pulling mechanism 405 is installed on the stand 401 above the lower fixed plate 403, and the pulling mechanism 405 is connected to the upper fixed plate 402 through a tension display 404.

[0115] Take the composite material of the present application and the ordinary composite material of the control example, the area of ​​the material is larger than the area of ​​the fixed plate, for example, the diameter of the fixed plate can be 100mm, and the adhesive surface is set on the lower fixed plate 403, and the bottom surface of the composite material is flatly pasted on the surface of the lower fixed plate 403. The upper fixed plate 402 is also provided with an adhesive surface, and the upper fixed plate 402 is pressed to make its adhesive surface adhere to the flat upper surface of the composite material. Pull the handle of the upper pulling mechanism 405 upward until the surface layer and the bottom layer material are separated, and observe the maximum value of the tension display 404. The test data is shown in Table 4:

[0116] Table 4

[0117]

[0118] It can be seen from Table 4 that the composite material of the present application has a greatly improved interlayer bonding strength compared with the material without a sinking structure through a face-to-face pull-off test due to the sinking structure.

[0119] In addition, the composite material of the present application and the ordinary composite material of the control example are taken, and the number, position and bonding area of ​​the bonding points of the composite material of the present application and the ordinary composite material are the same, and the convex parts and concave parts provided are the same. The difference between the composite material of the present application and the ordinary composite material is that the composite material of the present application is provided with a sinking structure, while the ordinary composite material is not provided with a sinking structure. The cut sample is 120mm away from the edge of the sample and is evenly distributed in the transverse and longitudinal directions of the sample. The sampling sample size is 100mm*25mm. The test is carried out in a standard atmosphere, and the standard atmosphere is in accordance with the provisions of GB / T6529. The composite material of the present application and the ordinary composite material are stretched as a whole material, and the sample is clamped at the center of the clamp. The pre-tension can be based on the provisions of GB / T3923.1. In a set of tests, the same tensile force is applied to the composite material of the present application and the ordinary composite material respectively with a tensile tester. It is observed that cracks will appear at the stress concentration point of the edge line of the bonding point of the ordinary composite material, while this phenomenon does not occur in the composite material of the present application. It is found that the multiple folding and calendering structure can eliminate the stress at the edge line of the first joint, thereby avoiding the phenomenon of the material cracking at the edge line of the first joint when the material is subjected to lateral side pulling, thereby solving the problem of failure of the bonding area.

[0120] The rebound performance test methods include non-pressurized thickness test and pressurized thickness and rebound thickness test.

[0121] Non-pressurized thickness test: the material thickness is tested in a natural state using a caliper.

[0122] Pressurized thickness and rebound thickness test: the sampling area is 100mm*100mm, the pressurized device is a test block with an area of ​​100mm*100mm and a weight of 1.25kg, the pressurization time is 1 hour, and then the thickness after pressurization is tested with a caliper, and then the rebound thickness is tested after 30 minutes.

[0123] The test results are shown in Table 5:

[0124] Table 5

[0125] Thickness without pressure Pressurized thickness Rebound thickness Composite materials of this application 1.35 0.81 1.16 Ordinary composite materials 1.35 0.52 0.82

[0126] It can be seen from Table 5 that the composite material of the present application has greatly improved resilience, that is, three-dimensional effect.

[0127] In one embodiment, the present application also proposes a manufacturing device for a composite material, including a roller group 1 for forming a plurality of protrusions 103 and depressions 102 on a surface layer 101 , and also including a roller group 2 for forming a sunken portion 202 on the surface layer 101 and an inner layer 201 at the depressions 102 .

[0128] It should be noted that in this embodiment, roller set 1 can be a pair of rollers or multiple pairs of rollers. Similarly, roller set 2 can also be a pair of rollers or multiple pairs of rollers. In this embodiment, the protrusion 103 can be formed first, and then the depression 102 is formed. In this embodiment, the depression 102 can also be formed first, and then the protrusion 103 is formed.

[0129] The sinking direction of the sinking part 202 is opposite to the protruding direction of the protrusion 103, so that the sinking part 202 and the depression 101 form a multi-layer depression structure. The sinking part 202 is provided with a first joint 203, and the first joint 203 is used to bond the surface layer 101 and the inner layer 201.

[0130] In this embodiment, if Figure 12-14 As shown, the first roller set includes a second roller 320 and a first roller 310 matched with the second roller 320 , and the second roller set includes a third roller 330 matched with the second roller 320 .

[0131] Specifically, the roller surface of the first roller 310 is provided with a first protrusion 311 and a third cavity 313. The roller surface of the second roller 320 is provided with a first cavity 321 corresponding to the first protrusion 311, and a fourth protrusion 325 corresponding to the third cavity 313. The first protrusion 311 and the first cavity 321 are used to form the protrusion 103 on the surface layer 101, and the third cavity 313 and the fourth protrusion 325 are used to form the depression 102 on the surface layer 101.

[0132] The second roller 320 has a second protrusion 322 on its roller surface, and the third roller 330 has a second cavity 331 on its roller surface corresponding to the second protrusion 322. The second protrusion 322 and the second cavity 331 are used to form a sinking portion 202 on the surface layer 101 and the inner layer 201 at the depression 102.

[0133] Regarding the formation of the first joint 203 and the second joint 204, in one embodiment, as Figure 15-17 As shown, the roller surface of the second roller 320 is further provided with a third protrusion 323, and the roller surface of the third roller 330 is provided with a first pressing surface 332 corresponding to the third protrusion 323. The third protrusion 323 and the first pressing surface 332 are used to form a second joint 204 on the surface layer 101 and the inner layer 201 at the recess 102.

[0134] A second pressing surface 333 is disposed on the bottom surface of the second cavity 331 , and the second protrusion 322 is further used to form a first joint 203 with the second pressing surface 333 .

[0135] In this embodiment, the first roller 310, the second roller 320 and the third roller 330 are all provided with a heating device to heat the roller surface, so that the roller surface has a certain working temperature, such as 80°C-120°C, that is, at this time, the first pressing surface 332 and the second pressing surface 333 are hot pressing surfaces. It should be noted that, in another embodiment, the first roller 310, the second roller 320 and the third roller 330 may not be provided with a heating device, that is, the first pressing surface 332 and the second pressing surface 333 are cold pressing surfaces.

[0136] It should be noted that the second joint 204 can be formed on the surface layer 101 and the inner layer 201 at the recess 102 by the third protrusion 323 and the first pressing surface 332, and then the first joint 203 is formed by the second protrusion 322 and the second pressing surface 333. Alternatively, the first joint 203 can be formed by the second protrusion 322 and the second pressing surface 333, and then the second joint 204 can be formed by the third protrusion 323 and the first pressing surface 332.

[0137] Regarding the formation of the first joint 203 and the second joint 204, in another embodiment, the manufacturing device further includes a bonding device 340, and the bonding device 340 is used to form the first joint 203 and the second joint 204. In this embodiment, the bonding device 340 is an ultrasonic or thermal bonding device, thereby realizing ultrasonic bonding or thermal bonding.

[0138] It should be noted that Fig. 22 As shown, the bonding device 340 is located before the second roller 320 and the third roller 330 cooperate. The first joint 203 is first formed by the bonding device 340, and then the second roller 320 and the third roller 330 cooperate to form the sinking portion 202 and the second joint 204. Fig.21 As shown, the bonding device 340 is located after the second roller 320 and the third roller 330 cooperate. At this time, the second roller 320 and the third roller 330 cooperate to form the sinking portion 202 and the second joint 204, and then the bonding device 340 forms the first joint 203.

[0139] Similarly, you can Fig. 22 As shown, the bonding device 340 is located before the second roller 320 and the third roller 330 cooperate. The second joint 204 is first formed by the bonding device 340, and then the second roller 320 and the third roller 330 cooperate to form the sinking portion 202 and the first joint 203. Fig.21 As shown, the bonding device 340 is located after the second roller 320 and the third roller 330 cooperate with each other, and the second roller 320 and the third roller 330 cooperate to form the sinking part 202 and the first joint 203, and then the bonding device 340 forms the second joint 204.

[0140] It should be noted that a bonding device 340 (not shown in the figure) may be provided before and after the second roller 320 and the third roller 330 cooperate. In this case, the first joint 203 and the second joint 204 are both formed by the bonding device 340, and the first joint 203 may be formed first and then the second joint 204; or the second joint 204 may be formed first and then the first joint 203.

[0141] Regarding the formation of the first joint 203 and the second joint 204, in another embodiment, an ultrasonic generator may be provided in the roller group 1 and / or the roller group 2, and the protrusion 103, the depression 102, and the sinking part 202 mentioned above may be formed by the ultrasonic generator, and the first joint 203 and the second joint 204 may be formed by the ultrasonic generator. Such ultrasonic generators may refer to the prior art and will not be described in detail here.

[0142] In one embodiment, if Figure 18-20 As shown, a hole-opening needle 324 is provided on the bottom surface of the first concave cavity 321, and a hole-opening needle cavity 312 is provided on the first protrusion 311 corresponding to the hole-opening needle 324. The hole-opening needle 324 and the hole-opening needle cavity 312 are used to form the hole 104 on the protrusion 103.

[0143] When the second joint 204 is formed first, and then the first joint 203 is formed by the bonding device 340, the preparation method of the composite material is as follows:

[0144] In step 1, the surface fiber material is unwound and fed between the first roller 310 and the second roller 320, and the first roller 310 and the second roller 320 are meshed with each other to form raised portions and recessed portions on the surface fiber material.

[0145] In step 2, the third roller 330 unwinds the inner layer fiber material and feeds it between the second roller 320 and the third roller 330 .

[0146] In step 3, the second roller 320 and the third roller 330 bond the surface fiber material and the inner fiber material processed in steps 1 and 2 through the third protrusion 323 on the second roller 320 and the first pressing surface 332 of the third roller to form a second joint 204; while bonding, the second protrusion 322 and the second cavity 331 engage with each other, thereby forming a sunken portion 202 on the surface material and the inner material at the recess 102.

[0147] In step 4, the second roller 320 continues to rotate and transmits the composite material processed in step 3 to the bonding device 340. The bonding device 340 and the second roller 320 cooperate to bond the bottom of the sinking portion 202 formed in step 3 to obtain the first joint 203, thereby obtaining a composite material.

[0148] When the first joint 203 is first formed by the bonding device 340, and then the second joint 204 and the sinking portion 202 are formed, the preparation method of the composite material is as follows:

[0149] In step 1, the surface fiber material is unwound and fed between the first roller 310 and the second roller 320, and the first roller 310 and the second roller 320 are meshed with each other to form raised portions and recessed portions on the surface fiber material.

[0150] In step 2, the third roller 330 unwinds the inner layer fiber material and feeds it between the second roller 320 and the third roller 330 .

[0151] Step 3, the bonding device 340 first performs bonding processing on the designated location to obtain the first bonding location 203;

[0152] In step 4, the second roller 320 and the third roller 330 bond the surface fiber material and the inner fiber material through the third protrusion 323 on the second roller 320 and the first pressing surface 332 of the third roller to form a second joint 204; while bonding, the second protrusion 322 and the second cavity 331 engage with each other, thereby forming a sinking portion 202 on the surface material and the inner material where the first joint 203 has been formed at the depression 102, and finally a composite material is obtained.

[0153] When the bonding device 340 is not provided, the preparation method of the composite material is as follows:

[0154] In step 1, the surface fiber material is unwound and fed between the first roller 310 and the second roller 320, and the first roller 310 and the second roller 320 are meshed with each other to form raised portions and recessed portions on the surface fiber material.

[0155] In step 2, the third roller 330 unwinds the inner layer fiber material and feeds it between the second roller 320 and the third roller 330 .

[0156] In step 3, the second roller 320 and the third roller 330 bond the surface fiber material and the inner fiber material processed in steps 1 and 2 through the third protrusion 323 on the second roller 320 and the first pressing surface 332 of the third roller to form a second joint 204; while bonding, the second protrusion 322 and the second cavity 331 engage with each other, thereby forming a sunken portion 202 on the surface material and the inner material at the recess 102, and forming a first joint 203 at the sunken portion 202 through the second protrusion 322 and the second pressing surface 333, and finally obtaining a composite material.

[0157] In one embodiment, the present application also proposes an absorbent article, which includes the above composite material. The absorbent article here can be baby diapers, adult diapers, baby pants diapers, adult pants diapers, incontinence pads, protective towels, sanitary napkins, sanitary pads, maternity towels, breast pads, absorbent pads, dry towels or wipes and other products. One or more of the surface layer, diversion layer, absorbent core, waist circumference, outer layer, three-dimensional guard, and waist patch of the absorbent article contain the above composite material.

[0158] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A composite material, comprising a surface layer (101) and an inner layer (201) arranged in layers; the surface layer (101) is provided with a plurality of protrusions (103) and depressions (102); Features: A sinking portion (202) is provided on the surface layer (101) and the inner layer (201) at the depression (102); The sinking direction of the sinking portion (202) is opposite to the protruding direction of the protrusion (103); The sinking portion (202) is provided with a first joint (203), and the first joint (203) is used to bond the surface layer (101) and the inner layer (201).

2. The composite material according to claim 1, characterized in that: The height difference between the upper end surface of the first joint (203) and the bottom surface of the recess (102) is H, where H≥0.01 mm.

3. The composite material according to claim 2, characterized in that: The value range of H is 0.01-10.5mm.

4. The composite material according to claim 1, characterized in that: When the composite material is laid flat, in the vertical direction, the ratio of the projected area of ​​the sunken portion (202) to the projected area of ​​the recess (102) is (0.01-1):

1.

5. The composite material according to claim 1, characterized in that: A second joint (204) is also provided on the surface layer (101) and the inner layer (201) at the depression (102), and the second joint (204) and the first joint (203) jointly bond the surface layer (101) and the inner layer (201).

6. The composite material according to claim 5, characterized in that: When the composite material is laid flat, in the vertical direction, the ratio of the projected area of ​​the second joint (204) to the projected area of ​​the sinking portion (202) is (0.1-10):

1.

7. The composite material according to claim 1, characterized in that: When the composite material is laid flat, in the vertical direction, the projection area of ​​the first joint (203) accounts for 0.1%-50% of the projection area of ​​the composite material.

8. The composite material according to claim 5, characterized in that: The second joint (204) is located at the root of the protrusion (103) and / or at the non-sunken area of ​​the depression (102).

9. The composite material according to claim 1, characterized in that: The sinking portion (202) is located in the central area of ​​the bottom surface of the depression (102), and the first joint (203) is located in the central area of ​​the bottom surface of the sinking portion (202).

10. The composite material according to claim 1, characterized in that: The bottom surface area of ​​the sinking portion (202) is larger than the bonding area of ​​the first joint (203).

11. The composite material according to any one of claims 1 to 10, characterized in that: The protrusion (103) is provided with a plurality of openings (104).

12. A manufacturing device for manufacturing the composite material according to claim 11, characterized in that: It comprises a roller set 1 for forming a plurality of protrusions (103) and depressions (102) on a surface layer (101); It also includes a roller group 2 for forming a sunken portion (202) on the surface layer (101) and the inner layer (201) at the depression (102); The sinking direction of the sinking portion (202) is opposite to the protruding direction of the protrusion (103); The sinking portion (202) is provided with a first joint (203), and the first joint (203) is used to bond the surface layer (101) and the inner layer (201).

13. The manufacturing device according to claim 12, characterized in that: The roller set 1 includes a second roller (320) and a first roller (310) adapted to the second roller (320); the roller set 2 includes a third roller (330) adapted to the second roller (320); A first protrusion (311) and a third concave cavity (313) are provided on the roller surface of the first roller (310); A first concave cavity (321) is provided on the roller surface of the second roller (320) corresponding to the first convexity (311), and a fourth convexity (325) is provided corresponding to the third concave cavity (313); The first protrusion (311) and the first cavity (321) are used to form a protrusion (103) on the surface layer (101); The third cavity (313) and the fourth protrusion (325) are used to form a depression (102) on the surface layer (101); A second protrusion (322) is provided on the roller surface of the second roller (320), and a second cavity (331) is provided on the roller surface of the third roller (330) corresponding to the second protrusion (322); the second protrusion (322) and the second cavity (331) are used to form a sunken portion (202) on the surface layer (101) and the inner layer (201) at the depression (102).

14. The manufacturing device according to claim 13, characterized in that: The roller surface of the second roller (320) is also provided with a third protrusion (323), and the roller surface of the third roller (330) is provided with a first pressing surface (332) corresponding to the third protrusion (323); the third protrusion (323) and the first pressing surface (332) are used to form a second joint (204); The bottom surface of the second cavity (331) is provided with a second pressing surface (333); the second protrusion (322) is also used to form a first joint (203) with the second pressing surface (333).

15. The manufacturing device according to claim 13, characterized in that: A bonding device (340) is provided before and / or after the second roller (320) and the third roller (330) are matched; the bonding device (340) is used to form a first joint (203) and a second joint (204).

16. The manufacturing device according to claim 13, characterized in that: A hole-opening needle (324) is provided on the bottom surface of the first concave cavity (321), and a hole-opening needle cavity (312) is provided on the first protrusion (311) corresponding to the hole-opening needle (324); The opening needle (324) and the opening needle cavity (312) are used to form an opening (104) on the protrusion (103).

17. The manufacturing device according to claim 12, characterized in that: An ultrasonic generating device is provided in the roller group 1 and / or the roller group 2, and the ultrasonic generating device is used to form a first joint (203) and a second joint (204).

18. An absorbent article, characterized in that: One or more of the surface layer, the guide layer, the absorbent core, the waistband, the outer layer, the three-dimensional guard, and the waist patch of the absorbent article contains the composite material according to any one of claims 1 to 11.

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