Hygienic product and wet activity opening change material

Abstract

The utility model relates to the technical field of special performance products and composite materials, in particular to a hygienic product and a wet activity opening change material which comprises a sheet, and a moisture absorption shrinkage material is arranged on the surface of the sheet and / or in the sheet. Part of the moisture absorption shrinkage material and the sheet are fixed through plasticizing bonding points; an opening is formed in the plasticizing bonding point and penetrates through the plasticizing bonding point and the moisture absorption shrinkage material at the plasticizing bonding point. And the moisture-absorbing shrinkage material and the sheet material are not fixed together in areas outside the plasticizing bonding points and are respectively kept free. The non-plasticized bonding part of the moisture absorption shrinkage material shrinks after absorbing moisture and pulls the opening to change, and the end of the moisture absorption shrinkage material, which is generated due to the opening, loses moisture absorption expansibility at the plasticized bonding point, so that the moisture absorption shrinkage material does not shrink any more, and the opening cannot be closed due to loss of the traction effect when the liquid amount is large.

Description

Technical Field

[0001] This utility model relates to the field of special performance products and composite materials, specifically to a hygiene product and a wet-active opening change material. Background Technology

[0002] Common surface materials such as Figures 1-3 As shown, where, Figure 1 It is a single-layer material on sheet 101 with plasticized adhesive points 102 processed on it; Figure 2 It is a double-layer embossed material in which bulges 103 are processed on sheet 101, and sheet 101 and inner layer 104 are bonded and fixed together by plastic adhesive points 102. Figure 3 What is being shown is Figure 2 The cross-sectional view of the double-layer embossed material shown.

[0003] The existing material has two main functions in setting plasticized bonding points 102: first, to enhance the overall visual appeal of the material; and second, to provide a certain degree of fixation and support for the material.

[0004] When existing surface layer materials are used to make diapers, urine can soak into the surface layer and reach below it. However, when loose stools are present, the viscous mixture containing particles cannot pass through the surface layer and remains there. When this mixture comes into contact with the skin, it can cause itching and redness. Similarly, when existing surface layer materials are used to make sanitary napkins, menstrual blood contains mucous membranes and other tissues, making it more viscous and prone to coagulation. Therefore, it is even more difficult for menstrual blood to pass through the surface layer and be absorbed by the core.

[0005] To address the aforementioned issues, existing surface materials are processed with through-holes 105. However, the surface materials with through-holes 105 are based on "moisture absorption," meaning these products only consider the state the product, the guide, and the core should have when wet, without considering what the consumer should look like when wearing these absorbent products in a dry state. Existing products cannot provide comfortable wear when dry.

[0006] for example, Figure 4 This is a schematic diagram showing the process of machining through holes 105 on the plasticized adhesive points 102 of the double-layer embossed material. For this type of product, if the diameter of the through hole 105 is large, the fixing and supporting effect of the adhesive point will be reduced, while if the diameter of the through hole 105 is small, it will be difficult for solids to pass through the surface layer.

[0007] Faced with the aforementioned problems, the applicant filed a patent application on October 26, 2023, with application number 2023114041928, entitled "A Moisture-Absorbing Openwork Product and Sanitary Product." This application discloses a moisture-absorbing and shrinking material, which is arranged on at least one side of a surface layer and fixed to the surface layer with at least one opening. When the moisture-absorbing and shrinking material absorbs liquid, it shrinks, thereby pulling the surface layer and opening the opening to allow solid matter to pass through.

[0008] Patent application number 2023114041928, entitled "A Moisture-Absorbing Openwork Product and Sanitary Product," reveals that the applicant places moisture-absorbing and shrinking material on both sides of the opening, with the ends of the material being unfixed free ends. Further research reveals that due to the presence of free ends, the opening lacks traction on both sides, resulting in the opening not opening completely and effectively after moisture absorption. Furthermore, the moisture-absorbing and shrinking material may not be properly fixed to the sheet material. After moisture absorption, the moisture-absorbing and shrinking yarns used to pull the opening may shift or detach from their fixed positions, reducing or eliminating the traction on the surface layer on both sides of the opening. This causes the opening to not open completely or to close again after opening, affecting the moisture-absorbing opening function and hindering the passage of viscous or lumpy substances through the opening. Utility Model Content

[0009] To address the aforementioned problems, the purpose of this utility model is to provide a hygiene product, a wet active opening change material, and a processing method thereof.

[0010] The technical solution provided by this utility model is as follows:

[0011] In a first aspect, a wet-active open-ended variable material includes a sheet, the sheet having a moisture-absorbing and shrinking material disposed inside; a portion of the moisture-absorbing and shrinking material is fixed to the sheet via a plasticized adhesive point; the plasticized adhesive point has an opening that penetrates the plasticized adhesive point and the moisture-absorbing and shrinking material at the plasticized adhesive point.

[0012] In a second aspect, a wet-active open-ended variable material includes a sheet, the surface of which is provided with a moisture-absorbing and shrinking material; a portion of the moisture-absorbing and shrinking material is fixed to the sheet through a plasticized adhesive point; the plasticized adhesive point is provided with an opening, the opening penetrating through the plasticized adhesive point and the moisture-absorbing and shrinking material at the plasticized adhesive point.

[0013] As an optional technical solution of the first or second aspect, the sheet material and the moisture-absorbing shrinkage material are melted by one or more of the following methods: high temperature, high pressure, ultrasound, and laser. After the sheet material and the moisture-absorbing shrinkage material interpenetrate, cool, and plasticize, the plasticized bonding point is formed. Under the action of high temperature, high pressure, ultrasound, or laser, the sheet material in the locally treated area undergoes localized melting, the moisture-absorbing shrinkage material dehydrates and loses its moisture-absorbing and expanding properties, and the sheet material permeates into the moisture-absorbing material. After cooling, the sheet material and the moisture-absorbing shrinkage material are fixed together. The portion of the moisture-absorbing shrinkage material treated at the plasticized bonding point loses its moisture-absorbing and expanding shrinkage properties, thus it can be better fixed at the plasticized bonding point.

[0014] The density of plasticized adhesive points is higher than that of non-adhesive areas of the sheet; the softness, thickness, and liquid permeability of plasticized adhesive points are lower than those of non-adhesive areas of the sheet.

[0015] As an optional technical solution of the first or second aspect, the moisture-absorbing and shrinking material has an end at or near the opening; the end of the moisture-absorbing and shrinking material refers to the end formed by the material breaking, and after opening at the plasticized bonding point, it fixes the connection part between the moisture-absorbing and shrinking material and the sheet.

[0016] All ends are fixed to the sheet material through plasticized adhesive points, and the ends are not free ends;

[0017] The projection of the end on the sheet is located within the projection area of ​​the plasticized adhesive point on the sheet.

[0018] Optionally, the non-free end of the moisture-absorbing and shrinking material is flush with or spaced from the edge of the opening.

[0019] As an optional technical solution of the first or second aspect, the area outside the plasticized bonding point is the non-plasticized bonding area, and the remaining moisture-absorbing and shrinking material and the sheet are independent of each other in the non-plasticized bonding area; when exposed to moisture, the moisture-absorbing and shrinking material in the plasticized bonding area does not shrink, while the moisture-absorbing and shrinking material in the non-plasticized bonding area shrinks after being exposed to moisture, which pulls the moisture-absorbing and shrinking material in the plasticized bonding area to cause the opening to expand.

[0020] Optionally, the length of the moisture-absorbing and shrinking material fixed to the sheet at the plasticized bonding point is L1, and the length of the moisture-absorbing and shrinking material in the non-plasticized bonding area is L2, wherein L1:L2 = (10:1) to (1:10).

[0021] As a second aspect, an optional technical solution, the moisture-absorbing and shrinking material is disposed on one side of the upper and / or lower surface of the sheet.

[0022] Alternatively, moisture-absorbing and shrink-absorbing material can pass through the sheet, being placed on both the upper and lower surfaces of the sheet.

[0023] As an optional technical solution of the first or second aspect, the surface of the plasticized adhesive point is generally flat or concave or convex; when the surface of the plasticized adhesive point is generally concave or convex, the depth of the concavity or the height of the protrusion is 0.01 to 100 mm.

[0024] As an optional technical solution of the first or second aspect, the plasticized adhesive points are multiple, and the multiple plasticized adhesive points are arranged at intervals, or in contact with each other, or partially arranged at intervals and partially in contact with each other; when the plasticized adhesive points are arranged at intervals, the distance between two adjacent plasticized adhesive points is 0.01 to 100 mm.

[0025] As an optional technical solution of the first or second aspect, the moisture-absorbing and shrinking material is one or more of the following: moisture-absorbing and shrinking yarn made of moisture-absorbing and shrinking PVA fiber, moisture-absorbing and shrinking strip or moisture-absorbing and shrinking cloth made of moisture-absorbing and shrinking PVA resin.

[0026] As an optional technical solution in the first or second aspect, the raw material of the moisture-absorbing and shrinking material is moisture-absorbing and expanding shrinking PVA fiber, with a degree of polymerization of 100-10000 and a degree of hydrolysis of 10%-100%. The higher the degree of polymerization and the degree of hydrolysis, the higher the energy required for molecular chain unfolding, and the worse the moisture absorption.

[0027] The degree of polymerization refers to the number of repeating units in a molecule. The higher the degree of polymerization, the longer the molecular chain, the stronger the intermolecular forces, and the lower the hygroscopicity.

[0028] The degree of alcoholysis refers to the content of alcohol hydroxyl groups (R-OH) in the molecular chain, which are the main functional groups for hygroscopic absorption. There are two types of degrees of alcoholysis: 88% and 99%. When the degree of alcoholysis is 88%, the hygroscopicity is good, while when the degree of alcoholysis is 99%, the hygroscopicity is poor.

[0029] Optionally: The moisture-absorbing, swelling, and shrinking PVA yarn absorbs moisture, expands, and shrinks in water at around 20°C.

[0030] Optionally: The moisture-absorbing, swelling, and shrinking PVA yarn absorbs moisture, expands, and shrinks in water at around 40°C.

[0031] Optionally: The moisture-absorbing, swelling, and shrinking PVA yarn absorbs moisture, expands, and shrinks in water at around 60°C.

[0032] Optionally: The moisture-absorbing, swelling, and shrinking PVA yarn absorbs moisture, expands, and shrinks in water at around 80°C.

[0033] When the molecular chains in a hygroscopic and shrink-absorbing material absorb moisture, water molecules diffuse and penetrate between the chains, causing segmental movement that loosens and untangles the entire molecular chain, resulting in expansion. Theoretically, in an infinitely long time and an infinitely large amount of solution, a hygroscopic and shrink-absorbing material can undergo infinite expansion and contraction.

[0034] Within a finite amount of solution and a finite time, hygroscopic shrinkage materials do not undergo unlimited expansion and contraction. Instead, when the material absorbs moisture, water molecules diffuse into it, causing the fibers to expand in the diameter direction and become more compact. The gaps between the fibers decrease, and the bending of the central fibers increases, resulting in wrinkling and shrinkage along the length direction. In short, hygroscopic expansion and contraction fibers refer to fibers that expand in the diameter direction and contract in the length direction due to moisture absorption.

[0035] By treating moisture-absorbing and shrinking materials, their cross-linking degree and moisture-absorbing expansion properties can be improved, preventing them from expanding and shrinking indefinitely. Optionally, the moisture-absorbing and shrinking materials can be treated with high temperature or high pressure, or with both high temperature and high pressure, or with laser treatment, or with ultrasonic treatment.

[0036] When the moisture-absorbing and shrinking material is a moisture-absorbing and shrinking strip or a moisture-absorbing and shrinking cloth, the thickness of the strip or cloth is 0.1–5 mm, and the basis weight is 0.01–500 g / m². 2 ;

[0037] When the moisture-absorbing and shrinking material is a moisture-absorbing and shrinking yarn, the yarns on both sides of the opening are of the same or different thickness, and / or the same or different number, and / or parallel or form an angle along the length extension direction.

[0038] As an optional technical solution of the first or second aspect, the moisture absorption response time of the moisture-absorbing and shrinking material is 0 to 60 seconds.

[0039] As an optional technical solution of the first or second aspect, the moisture absorption and shrinkage rate of the moisture-absorbing and shrinkage material is 1-95%.

[0040] As an optional technical solution of the first or second aspect, the sheet material is one or more of fiber products, paper products, and film materials, and the sheet weight is 0.1-500 g / m³. 2 The thickness ranges from 0.001 to 50 mm.

[0041] As an optional technical solution of the first or second aspect, the opening is one or more of the following: a straight slit, a cross slit, an H-shaped slit, a rectangular slit, an elliptical hole, a rectangular hole, a trapezoidal hole, an elliptical hole connected to a straight slit, an elliptical hole connected to a cross slit, and the two ends of the slit connected to a circular hole.

[0042] Optionally, the slit is entirely located at the plasticized bonding point, or partially located in the non-plasticized bonding area of ​​the sheet; the surface area of ​​the opening accounts for 1 to 99% of the surface area of ​​the plasticized bonding point.

[0043] As a technical solution for opening, methods such as cutting, turning, milling, planing, grinding, cutting, punching, drilling, extrusion, stretching, jacking, needle punching, boring, hot stamping, laser, chemical etching, vacuum suction, and heavy ion can be used to open the opening.

[0044] Thirdly, a method for processing the wet-active open-type material as described in the first or second aspect, or any optional technical solution of the first or second aspect, includes:

[0045] The moisture-absorbing and shrink-absorbing material is stacked with the sheet; first, the sheet and the moisture-absorbing and shrink-absorbing material are fixed by the bonding mechanism to form plasticized bonding points; then, openings are processed on the plasticized bonding points by the opening mechanism.

[0046] Alternatively: Stack the moisture-absorbing and shrink-absorbing material with the sheet; first, use an opening mechanism to process openings in the sheet and the moisture-absorbing and shrink-absorbing material; then use an adhesive mechanism to fix the sheet and the moisture-absorbing and shrink-absorbing material to form plasticized adhesive points;

[0047] Alternatively: Stack the moisture-absorbing and shrink-fitting material with the sheet; use an opening mechanism to process openings in the sheet and the moisture-absorbing and shrink-fitting material, and simultaneously use an adhesive mechanism to fix the sheet and the moisture-absorbing and shrink-fitting material to form plasticized adhesive points.

[0048] Alternatively: Lay the moisture-absorbing and shrink-absorbing material inside the sheet; first, fix the sheet and the moisture-absorbing and shrink-absorbing material with an adhesive mechanism to form plasticized adhesive points; then, process openings on the plasticized adhesive points with an opening mechanism.

[0049] Alternatively: Lay the moisture-absorbing and shrink-absorbing material inside the sheet; first, use an opening mechanism to process openings in the sheet and the moisture-absorbing and shrink-absorbing material; then use an adhesive mechanism to fix the sheet and the moisture-absorbing and shrink-absorbing material to form plasticized adhesive points;

[0050] Alternatively: Lay the moisture-absorbing and shrink-absorbing material inside the sheet; fix the sheet and the moisture-absorbing and shrink-absorbing material through an adhesive mechanism to form plasticized adhesive points; and simultaneously process openings on the plasticized adhesive points through an opening mechanism.

[0051] Alternatively; interweave the moisture-absorbing and shrink-absorbing material onto the upper and lower surfaces of the sheet; fix the sheet to the moisture-absorbing and shrink-absorbing material using an adhesive mechanism to form plasticized adhesive points; and process openings on the plasticized adhesive points using an opening mechanism.

[0052] Alternatively; interweave the moisture-absorbing and shrink-absorbing material onto the upper and lower surfaces of the sheet; create openings at the plasticized bonding points using an opening mechanism; and fix the sheet and the moisture-absorbing and shrink-absorbing material using an adhesive mechanism to form plasticized bonding points;

[0053] Alternatively, the moisture-absorbing and shrink-absorbing material is interlaced on the upper and lower surfaces of the sheet; openings are processed at the plasticized bonding points using an opening mechanism; and the sheet and the moisture-absorbing and shrink-absorbing material are simultaneously fixed using an adhesive mechanism to form plasticized bonding points.

[0054] Fourthly, a sanitary product comprising the wet-active opening change material described in the first or second aspect or any one of the optional technical solutions of the first or second aspect.

[0055] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0056] In this invention, the end of the moisture-absorbing and shrinking material is plasticized and fixed to the sheet at the plasticized bonding point, causing the end of the moisture-absorbing and shrinking material to lose its moisture absorption and expansion shrinkage properties. Simultaneously, other parts of the moisture-absorbing and shrinking material are not fixed to the non-plasticized bonding point area of ​​the sheet. When the moisture-absorbing and shrinking material absorbs liquid, the moisture-absorbing and shrinking material located in the non-plasticized bonding point area of ​​the sheet shrinks, while the end of the moisture-absorbing and shrinking material located in the plasticized bonding point area does not undergo moisture absorption and expansion shrinkage. This shrinkage of the moisture-absorbing and shrinking material, along with the pulling force, causes the opening at the plasticized bonding point to open and enlarge, facilitating the passage of solid and viscous substances through the enlarged opening formed on the surface layer into the core or other parts beneath the surface layer. Because the moisture-absorbing and shrinking material fixed at the plasticized bonding point loses its moisture absorption and expansion shrinkage properties, it will not lose its fixing function due to moisture absorption and expansion, thus ensuring that the opening will not close due to the loss of the pulling force when the liquid volume is large. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of a single-layer material with plasticized adhesive points processed on a sheet in the prior art;

[0058] Figure 2 This is a schematic diagram of a double-layer embossed material with bulges processed on a sheet in the prior art;

[0059] Figure 3 for Figure 2 A cross-sectional view of the double-layer embossed material shown;

[0060] Figure 4 A schematic diagram of a prior art technique where through holes are provided at the plasticizing and bonding points of a double-layer embossed material;

[0061] Figure 5 This is a schematic diagram of the moisture-absorbing and shrinking material at the end and the opening in one embodiment of this application;

[0062] Figure 6 for Figure 5 Schematic diagram of the opening when the middle part is open;

[0063] Figure 7 This is a schematic diagram showing a gap between the end of the moisture-absorbing and shrinking material and the opening in one embodiment of this application;

[0064] Figure 8 for Figure 7 Schematic diagram of the opening when the middle part is open;

[0065] Figure 9 This is a schematic diagram of one embodiment of the present application, showing that the opening is rectangular and the end of the moisture-absorbing and shrinking material is flush with the opening.

[0066] Figure 10 for Figure 9 Schematic diagram of the opening when the middle part is open;

[0067] Figure 11 This is a schematic diagram of an embodiment of the present application where the opening is rectangular and there is a gap between the end of the moisture-absorbing and shrinking material and the opening;

[0068] Figure 12 for Figure 11 Schematic diagram of the opening when the middle part is open;

[0069] Figure 13 This is a schematic diagram of two plasticized adhesive points adjacent to each other in one embodiment of this application;

[0070] Figure 14 for Figure 13 Schematic diagram of the opening when the middle part is open;

[0071] Figure 15 This is a schematic diagram showing the plasticized adhesive points in contact with each other in one embodiment of this application;

[0072] Figure 16 for Figure 15 Schematic diagram of the opening when the middle part is open;

[0073] Figure 17 This is a schematic diagram of an embodiment of the present application where the plasticized adhesive point is circular;

[0074] Figure 18 for Figure 17 Schematic diagram of the opening when the middle part is open;

[0075] Figure 19 This is a schematic diagram of an embodiment of the present application where the yarns on both sides of the opening are thicker on one side and thinner on the other.

[0076] Figure 20 for Figure 19 Schematic diagram of the opening when the middle part is open;

[0077] Figure 21 This is a schematic diagram showing the moisture-absorbing and shrinking materials on both sides of the opening in one embodiment of this application when they are parallel.

[0078] Figure 22 for Figure 21 Schematic diagram of the opening when the middle part is open;

[0079] Figure 23 This is a schematic diagram showing the angle formed by the extended lines of the moisture-absorbing and shrinking materials on both sides of the opening in one embodiment of this application.

[0080] Figure 24 for Figure 23 Schematic diagram of the opening when the middle part is open;

[0081] Figure 25 This is a schematic diagram of a comparative example where the moisture-absorbing and shrinking material has a free end.

[0082] Figure 26 This is a schematic diagram of the adhesive length and traction length in one embodiment of this application;

[0083] Figure 27 This is a schematic diagram showing the different shapes of slits in the openings of this application;

[0084] Figure 28 for Figure 27 Schematic diagram of the opening when the middle part is open;

[0085] Figure 29 This is a schematic diagram showing different hole shapes in this application;

[0086] Figure 30 for Figure 29 Schematic diagram of the opening when the middle part is open;

[0087] Figure 31 This application presents a schematic diagram of a composite material consisting of two layers of wet active opening-changing materials in one embodiment.

[0088] Figure 32 for Figure 31 A schematic diagram showing the opening in the middle, with the top smaller than the bottom;

[0089] Figure 33 This is a schematic diagram of two layers of wet active opening change material composite in another embodiment of this application;

[0090] Figure 34 for Figure 33 A schematic diagram showing the opening in the middle being larger at the top and smaller at the bottom;

[0091] Figure 35 This is a schematic diagram illustrating the process of first plasticizing and bonding the material and then processing the opening when the moisture-absorbing and shrink-absorbing material is disposed on one side of the sheet in one embodiment of this application.

[0092] Figure 36 This is a schematic diagram illustrating the process of first processing an opening and then plasticizing and bonding a moisture-absorbing and shrink-absorbing material on one side of a sheet in one embodiment of this application.

[0093] Figure 37 This is a schematic diagram showing the simultaneous completion of the opening and plasticizing bonding when the moisture-absorbing and shrinking material is disposed on one side of the sheet in one embodiment of this application.

[0094] Figure 38 This is a schematic diagram showing the difference in the number of yarns on both sides of the opening in one embodiment of this application;

[0095] Figure 39 for Figure 38 A schematic diagram showing the opening after the central opening is fully open;

[0096] Figure 40 This is a schematic diagram of the moisture-absorbing and shrinking material and the sheet after plastic bonding in one embodiment of this application;

[0097] Figure 41 This is a schematic diagram showing that moisture-absorbing and shrinking materials are simultaneously disposed on the upper and lower surfaces of the sheet in one embodiment of this application;

[0098] Figure 42 This is a schematic diagram of an embodiment of the present application where the moisture-absorbing and shrinking material is disposed inside the sheet;

[0099] Figure 43 This is a schematic diagram comparing the plasticized and non-plasticized portions of the moisture-absorbing and shrinking material after moisture absorption in one embodiment of this application;

[0100] Figure 44 This is a schematic diagram showing the case where the opening length is greater than the width of the plasticized adhesive point in this application.

[0101] Figure 45 for Figure 44 A schematic diagram showing the opening after the central opening is fully open;

[0102] Figure 46 This is a schematic diagram of an embodiment of the present application in which the moisture-absorbing and shrink-absorbing material is disposed inside the sheet, and the opening is processed after plasticizing and bonding.

[0103] Figure 47 This is a schematic diagram of an embodiment of the present application in which the moisture-absorbing and shrinking material is disposed inside the sheet, and an opening is first processed and then plasticized and bonded.

[0104] Figure 48 This is a schematic diagram showing, in one embodiment of the present application, the moisture-absorbing and shrinking material is disposed inside the sheet, and the processing of the opening and plasticizing bonding are completed simultaneously;

[0105] Figure 49 This is a schematic diagram of an embodiment of the present application in which moisture-absorbing and shrink-absorbing materials are simultaneously disposed on the upper and lower surfaces of a sheet, and the opening is processed after plasticizing and bonding.

[0106] Figure 50 This is a schematic diagram of an embodiment of the present application in which moisture-absorbing and shrinking materials are simultaneously disposed on the upper and lower surfaces of a sheet, with openings processed first and then plasticized and bonded.

[0107] Figure 51 This is a schematic diagram showing, in one embodiment of this application, the moisture-absorbing and shrinking material is simultaneously disposed on the upper and lower surfaces of the sheet, and the processing of the opening and plasticizing bonding are completed simultaneously.

[0108] Explanation of the labels in the diagram:

[0109] Sheet 101;

[0110] Plasticized adhesive point 102;

[0111] 103 bulges;

[0112] Inner layer 104;

[0113] Through hole 105;

[0114] Moisture-absorbing and shrink-off material 201;

[0115] Non-free end 201-1;

[0116] Free end 201-2;

[0117] Opening 202;

[0118] Adhesion mechanism 301;

[0119] Opening mechanism 302. Detailed Implementation

[0120] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0121] The structures, proportions, and sizes illustrated in the accompanying drawings are solely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0122] In one embodiment, this application proposes a wet-active opening-changing material, such as... Figure 5-34 As shown in Figures 38-45, the sheet 101 is included, and a moisture-absorbing and shrink-absorbing material 201 is disposed on the surface and / or inside of the sheet 101. That is, the moisture-absorbing and shrink-absorbing material 201 can be disposed on the upper or lower surface of the sheet 101. The moisture-absorbing and shrink-absorbing material 201 can also pass through the sheet 101, and can be disposed on both the upper and lower surfaces of the sheet. When the thickness of the sheet 101 is greater than the thickness of the moisture-absorbing and shrink-absorbing material 201, for example, when the thickness of the sheet is 0.01mm-5mm, the moisture-absorbing and shrink-absorbing material 201 can also be disposed inside the sheet 101.

[0123] It also includes a moisture-absorbing and shrink-absorbing material 201, only a portion of which is fixed to the sheet 101 via plasticized adhesive points 102. In the non-plasticized adhesive areas, the sheet 101 and the moisture-absorbing and shrink-absorbing material 201 are independent of each other. In the figures of this application, for ease of identification, the material thickness at the plasticized adhesive points 102 is significantly less than that in the adjacent areas of the material composed of the sheet 101 and the moisture-absorbing and shrink-absorbing material 201.

[0124] The plasticized adhesive point 102 is provided with an opening 202, which penetrates the plasticized adhesive point 102 and the moisture-absorbing and shrinking material 201 at the plasticized adhesive point 102.

[0125] The area outside the plasticized bonding point 102 is the non-plasticized bonding area. The remaining moisture-absorbing and shrinking material 201 and the sheet 101 are independent of each other in the non-plasticized bonding area. When exposed to moisture, the moisture-absorbing and shrinking material 201 in the plasticized bonding area does not shrink, while the moisture-absorbing and shrinking material 201 in the non-plasticized bonding area shrinks after being exposed to moisture. This shrinkage pulls the moisture-absorbing and shrinking material 201 in the plasticized bonding area, causing the opening 202 to expand, thereby facilitating the passage of solid and viscous substances through the opening 202 through the sheet 101.

[0126] When the sheet 101 partially melts and penetrates into the treated portion of the moisture-absorbing and shrinking material 201, forming a plasticized adhesive point 102, the moisture absorption performance of this portion of the moisture-absorbing and shrinking material 201 decreases or even disappears, thus preventing further expansion and contraction. Because the ends of the moisture-absorbing and shrinking material lose their moisture-absorbing and shrinking properties, they will not expand indefinitely or become unfixable. Therefore, even when in contact with a large amount of liquid, the ends of the moisture-absorbing and shrinking material will not lose their fixation or undergo relative displacement, and the opening will not close due to the loss of traction.

[0127] Plasticized bonding point 102 refers to a film-like area formed by melting sheet 101 and moisture-absorbing shrinkage material 201 through one or more methods, including high temperature, high pressure, ultrasound, and laser, allowing the sheet 101 and moisture-absorbing shrinkage material 201 to interpenetrate, cool, and plasticize. The density of plasticized bonding point 102 is higher than that of non-plasticized bonding area. The softness, thickness, and liquid permeability of plasticized bonding point 102 are lower than those of non-plasticized bonding area. Since ultrasonic treatment produces better plasticized bonding points than high temperature and high pressure treatment, ultrasonic treatment is preferred for forming plasticized bonding points.

[0128] The moisture-absorbing and shrink-fitting material 201 has an end at or near the opening 202. The projection of the end onto the sheet 101 lies within the projection area of ​​the plasticized adhesive point 102 on the sheet 101. The end is a non-free end 201-1, which here refers to the end plastically bonded to the sheet 101. The non-free end 201-1 of the moisture-absorbing and shrink-fitting material 201 can be flush with the edge of the opening 202, such as... Figure 9As shown. The non-free end 201-1 of the moisture-absorbing and shrinking material 201 can have a gap with the edge of the opening 202, such as... Figure 7 As shown.

[0129] Regarding the placement of the moisture-absorbing and shrink-fitting material 201, it can be placed on either the upper or lower surface of the sheet 101. The moisture-absorbing and shrink-fitting material 201 can also pass through the sheet 101, being placed on both the upper and lower surfaces. Alternatively, the thickness of the sheet 101 can be greater than the thickness of the moisture-absorbing and shrink-fitting material 201, with the material 201 disposed inside the sheet 101.

[0130] As an optional embodiment, the moisture-absorbing and shrinking material 201 is one or more of the following: moisture-absorbing and shrinking yarn made of PVA fiber, or moisture-absorbing and shrinking strip or moisture-absorbing and shrinking cloth made of PVA resin by spinning through a spinneret and hot rolling.

[0131] PVA (polyvinyl alcohol) is a hydrophilic polymer whose hygroscopic expansion and contraction is mainly due to the hydroxyl (-OH) functional groups in its molecules. The higher the degree of alcoholysis, the lower the hygroscopicity; the higher the degree of polymerization, the longer the molecular chain, the stronger the intermolecular interaction force, and the lower the hygroscopicity.

[0132] When PVA (polyvinyl alcohol) absorbs moisture, water molecules first diffuse into the outer molecular chains, causing the PVA molecular chains to unfold. This manifests as expansion, while the overall structure shrinks towards the center. Higher degrees of polymerization and alcoholysis result in smaller spaces for molecular chain movement, making water molecule diffusion more difficult and requiring higher energy for chain unfolding. This leads to the classification of PVA into low-temperature, medium-temperature, and high-temperature types.

[0133] PVA (polyvinyl alcohol) has a melting point of 224-239℃, but it loses its hygroscopic expansion and contraction properties when it undergoes dehydration and cross-linking at 160-170℃. By using local high heat and / or high pressure, laser treatment, or cross-linking treatment, the hydroxyl groups (-OH) can be reduced by 80%-99%, which can reduce the hygroscopicity of the material or even turn it into a non-hygroscopic material.

[0134] Moisture-absorbing and shrinking yarn is made from short fibers of moisture-absorbing and shrinking PVA through ring spinning. Its basic structural characteristic is a tight inner core and a loose outer core; half of the fibers are conical spirals, while a small portion do not undergo this internal / external transfer and remain cylindrical spirals. When this yarn comes into contact with water, the fibers absorb moisture and expand, causing the inter-fiber gaps to narrow, and the yarn as a whole wrinkles and gathers towards the center. Simultaneously, the yarn unwinds during the expansion process, further shrinking and exhibiting a certain degree of shrinkage force.

[0135] Moisture-absorbing and shrinking materials can be shrink yarns or shrink cloths made of moisture-absorbing and expanding yarns and spandex, or shrink strips or shrink cloths made of moisture-absorbing and expanding shrinking PVA staple fibers. When the moisture-absorbing and shrinking material is yarn, the shrink yarn can be a single thread made of single strand or multiple strands spirally wound together, or it can be multiple threads arranged in parallel or wrapped together; the moisture-absorbing and shrinking material can also be a strip or block of cloth.

[0136] The opening 202 penetrating the plasticized adhesive point 102 means that the opening 202 extends from one side of the sheet 101 to the other. When the opening 202 is enlarged by the moisture-absorbing and shrinking material 201, solid or viscous substances will pass through the opening 202 through the sheet 101. It should be noted that the opening 202 can exist in the form of a slit, a hole with an inner diameter, or a combination of both. When the opening 202 exists in the form of a slit, the sidewalls on both sides of the slit can be in contact with each other. When subjected to a pulling force, the sidewalls on both sides will separate, thereby forming a through hole.

[0137] Sheet 101 can be one or more of the following: fiber products, paper products, and film materials. Fiber products can be non-woven fabrics, elastic fabrics, shrink fabrics, or woven fabrics. Sheet 101 has a basis weight of 0.1–500 g / m². 2 The thickness ranges from 0.001 to 50 mm.

[0138] The specific method for testing basis weight is as follows: Using an electronic balance (accurate to 0.01g), an LD-102 force sampler, and a paper cutter, cut a 0.01 square meter sample of nonwoven fabric using the force sampler. If the material width is less than 120mm, cut a 1m sample using the paper cutter. The area = actual width (m) * 1 square meter. Weigh each sample using the electronic balance (G), and calculate the basis weight from the sample area: basis weight = G / sample area. Note that the average value of at least 9 test points should be taken as the basis weight. The reference standards for basis weight testing are "FZ / T 64046 2014 Hot Air Method for Nonwoven Fabrics" and "GB / T 24218.1-2009 Textiles - Nonwoven Fabrics - Test Methods - Part 1: Determination of Mass per Unit Area".

[0139] The specific method for testing thickness is as follows: a YG141D digital fabric thickness gauge is used, and the test area is set to 2500 mm². 2The test pressure is the pressure applied by a 100g weight. A paper cutter is also used. Take a 1m sample of uniform texture, start the thickness gauge, lower the pressure plate to the bottom, and confirm the measured value is 0. Raise the pressure foot, place the sample on the reference plate under no tension, lower the pressure foot until it contacts the sample, measure for 10 seconds, and the instrument reading is the sample thickness. Take the average value of at least 9 test points as the thickness. The reference standards are FZ / T 64046 2014 Hot Air Method for Nonwoven Fabrics and GB / T 24218.2-2009 Textiles - Nonwoven Fabrics - Test Methods - Part 2: Determination of Thickness.

[0140] Regarding the shape of the plasticized adhesive point 102, as an optional embodiment, the surface of the plasticized adhesive point 102 is generally flat or "concave" or "convex". When the surface of the plasticized adhesive point 102 is generally "concave" or "convex", the depth of the concavity or the height of the protrusion is 0.01 to 100 mm.

[0141] Furthermore, there may be multiple plasticized adhesive points 102. These multiple plasticized adhesive points 102 may be arranged at intervals, in contact with each other, or partially arranged at intervals and partially in contact with each other. When the plasticized adhesive points 102 are arranged at intervals, the distance between two adjacent plasticized adhesive points 102 is 0.01 to 100 mm.

[0142] When the moisture-absorbing shrinkage material 201 is a moisture-absorbing shrinkage strip or a moisture-absorbing shrinkage cloth, the thickness of the moisture-absorbing shrinkage strip or the moisture-absorbing shrinkage cloth is 0.1–5 mm, and the basis weight is 0.01–500 g / m². 2 The thickness and weight testing methods here can refer to the testing methods described above.

[0143] When the moisture-absorbing and shrinking material 201 is a moisture-absorbing and shrinking yarn, the yarns on both sides of the opening 202 are of the same or different thickness, and / or the same or different number, and / or parallel or form an angle along the length extension direction.

[0144] As an optional technical solution, the length of the moisture-absorbing and shrinking material 201 fixed to the sheet 101 at the plasticized bonding point 102 is L1, and the length of the moisture-absorbing and shrinking material 201 in the non-plasticized bonding area is L2, wherein L1:L2 = (10:1) to (1:10). See also Figure 26 The length of the moisture-absorbing and shrinking material 201 and the sheet 101 fixed at the plasticized bonding point 102 is the fixed length L1, and the length of the moisture-absorbing and shrinking material 201 in the non-plasticized bonding area is the traction length L2.

[0145] The shape of the opening 202 can be one or more of the following: a straight slit, a cross slit, an H-shaped slit, a rectangular slit, an elliptical hole, a rectangular hole, a trapezoidal hole, an elliptical hole connected to a straight slit, an elliptical hole connected to a cross slit, or slits with both ends connected to circular holes. These will not be elaborated or limited here.

[0146] If the opening is slit-shaped, the slit can be entirely located at the plasticized bonding point 102, or partially located in the non-plasticized bonding area of ​​the sheet 101. If the opening is pore-shaped, the surface area of ​​the opening accounts for 1 to 99% of the surface area of ​​the plasticized bonding point 102.

[0147] For different shapes of the plasticized adhesive points 102, different arrangements of the moisture-absorbing and shrinking materials 201, and different shapes of the openings 202, please refer to... Figure 5-24 The various embodiments shown in 27-34 and 38-45, as well as the schematic diagrams of the openings in each embodiment, are illustrated.

[0148] As an optional implementation, the moisture-absorbing and shrinking material 201 can simultaneously use two sets of yarns of different specifications. When the moisture absorption of one set reaches a certain value, it fails and closes. Then, when the moisture absorption of the second set of materials on the product reaches a higher value, it begins to shrink and open. For example, L01 and T01 moisture-absorbing and shrinking materials are arranged side by side on the plasticized bonding point of the sheet and processed with openings. It is then attached to the core, with a 20g water-repellent PE film placed under the core. 80ml of physiological saline is continuously added within 10 seconds. The L01 moisture-absorbing and shrinking material will shrink and open, first opening and then failing and closing, while the T01 moisture-absorbing and shrinking material remains unchanged. Within a second 10 seconds, 80ml of physiological saline is continuously added. The T01 moisture-absorbing and shrinking material will shrink and open the opening before closing.

[0149] For moisture-absorbing and shrink-resistant yarns, there are different specifications, as detailed in Table 1 below:

[0150] 20℃ 40℃ 60℃ 80℃ 40S S01 D01 Z01 G01 20S S02 D02 Z02 G02 20S / 2 D03 Z03

[0151] Table 1. Number of different specifications of moisture-absorbing and shrinkage yarn

[0152] In this context, "S" represents the yarn count in the English system. It refers to the number of 840-yard lengths a pound of yarn weighs under standard moisture regain. Generally, staple fiber yarn counts are expressed using "S," and staple fiber is abbreviated as "Staple" in English. The thicker the yarn, the smaller the "S" value; the finer the yarn, the larger the "S" value. For example, 40S yarn is finer than 20S yarn, and 20S / 2 refers to two 20S yarns intertwined and twisted together.

[0153] Nm, the metric count, refers to the number of meters in length of 1 gram of yarn at standard moisture regain. In other words, 1 gram of yarn exactly one meter long is 1 (metric) count yarn, and 1 gram of yarn 200 meters long has a yarn fineness of 200 count. Metric count is also a fixed-weight system, so the higher the count, the finer the yarn.

[0154] D is an abbreviation for Denier, a method of expressing the fineness of chemical fibers. It refers to the weight in grams of 9000 meters of filament at standard moisture regain. Generally, the count of filaments is expressed using D. Filament is abbreviated as Fiber in English. The larger the D value, the thicker the yarn; for example, 75D is thicker than 50D.

[0155] The conversion relationships between the three are: D = 5315 / S, D = 9000 / N.

[0156] The moisture absorption response temperature of yarns of various specifications was measured, and the data in Table 2 are as follows:

[0157] 10mm free segment Moisture absorption response temperature / °C S01 5 D01 25 D02 25 D03 25 Z01 45 G01 75

[0158] Table 2. Moisture absorption response temperature of yarns of various specifications

[0159] It can be seen that the higher the yarn temperature specification, the higher its moisture absorption response temperature, and the higher the temperature at which it eventually begins to shrink. Under certain conditions, it can still maintain its shrinkage force.

[0160] As an optional technical solution, the moisture absorption response time of the moisture-absorbing shrinkage material 201 is 0-20s. The moisture absorption response time refers to the time from the moment a 10mm length of the moisture-absorbing shrinkage material is immersed in 10ml of liquid until the yarn begins to change.

[0161] Optionally, the moisture-absorbing shrinkage rate of the moisture-absorbing shrinkage material 201 is 1-95%. The moisture-absorbing shrinkage rate refers to the percentage difference between the size of the yarn before water absorption and the size after water absorption and shrinkage. It reflects the degree of dimensional reduction of the moisture-absorbing shrinkage material after water absorption.

[0162] The test method for yarn moisture absorption and shrinkage rate is as follows: 10mm yarn is placed in a constant temperature oven (temperature 37℃), and 10ml of 37℃ physiological saline solution is added to immerse the yarn. The moisture absorption response time, shrinkage time, and final length after shrinkage are observed and recorded. The shrinkage rate of yarns of various specifications is tested, and the data in Table 3 are obtained.

[0163]

[0164] Table 3 Shrinkage rate of yarns of various specifications

[0165] The data in the table shows that the higher the temperature specification of the yarn, the slower the moisture absorption response time, the slower the shrinkage rate, and the lower the shrinkage rate. The thicker the yarn, the slower the moisture absorption response time and the faster the shrinkage rate.

[0166] In addition, at an ambient temperature of 25°C, physiological saline was used as the test liquid to detect the changes in the state of different moisture-absorbing and shrinking materials in contact with the liquid, and the data in Table 4 were obtained:

[0167]

[0168] Table 4. Changes in the amount of liquid contacted by different specifications of moisture-absorbing and shrinking materials.

[0169] If L01 moisture-absorbing and shrink-absorbing material is placed on the plasticized bonding point of the sheet and an opening is provided, and it is attached to the core, with 20g of water-repellent PE film placed under the core, and 80ml of physiological saline is continuously added within 10s, the L01 moisture-absorbing and shrink-absorbing material will pull the opening open, and then close due to failure.

[0170] This application also proposes a processing method for moisture-absorbing, active, open-ended materials, specifically:

[0171] like Figure 35 As shown, the moisture-absorbing and shrinking material 201 and the sheet 101 are stacked; the sheet 101 and the moisture-absorbing and shrinking material 201 are bonded together by the bonding mechanism 301 to form a plasticized bonding point 102; and an opening 202 is processed on the plasticized bonding point 102 by the opening mechanism 302.

[0172] Or such as Figure 36 As shown, the moisture-absorbing and shrinking material 201 and the sheet 101 are stacked; an opening 202 is processed on the sheet 101 and the moisture-absorbing and shrinking material 201 by the opening mechanism 302; the sheet 101 and the moisture-absorbing and shrinking material 201 are bonded by the bonding mechanism 301 to form a plasticized bonding point 102.

[0173] Or such as Figure 37 The shrinkable material 201 and the sheet 101 are stacked together; an opening 202 is processed on the sheet 101 and the moisture-absorbing shrinkable material 201 by the opening mechanism 302, and the sheet 101 and the moisture-absorbing shrinkable material 201 are bonded together by the bonding mechanism 301 to form a plasticized bonding point 102.

[0174] Or such as Figure 46 As shown, the moisture-absorbing and shrinking material 201 is placed inside the sheet 101. First, the sheet 101 and the moisture-absorbing and shrinking material 201 are fixed by the adhesive mechanism 301 to form a plastic adhesive point 102. Then, the opening mechanism 302 processes an opening 202 on the plastic adhesive point 102.

[0175] Or such as Figure 47 As shown, the moisture-absorbing and shrinking material 201 is placed inside the sheet 101. First, the opening mechanism 302 is used to process the opening 202 on the sheet and the moisture-absorbing and shrinking material. Then, the sheet 101 and the moisture-absorbing and shrinking material 201 are fixed by the adhesive mechanism 301 to form a plastic adhesive point 102.

[0176] Or such as Figure 48As shown, the moisture-absorbing and shrinking material 201 is placed inside the sheet 101, and the sheet 101 and the moisture-absorbing and shrinking material 201 are fixed by the adhesive mechanism 301 to form a plastic adhesive point 102; and at the same time, the opening mechanism 302 processes an opening 202 on the plastic adhesive point 102.

[0177] Or such as Figure 49 As shown, the moisture-absorbing and shrinking material 201 is interlaced on the upper and lower surfaces of the sheet 101. First, the sheet 101 and the moisture-absorbing and shrinking material 201 are fixed by the adhesive mechanism 301 to form plastic adhesive points 102. Then, the opening mechanism 302 processes the opening 202 on the plastic adhesive points 102.

[0178] Or such as Figure 50 As shown, the moisture-absorbing and shrinking material 201 is interlaced on the upper and lower surfaces of the sheet 101. First, the opening mechanism 302 is used to process openings 202 on the sheet and the moisture-absorbing and shrinking material. Then, the sheet 101 and the moisture-absorbing and shrinking material 201 are fixed by the adhesive mechanism 301 to form plastic adhesive points 102.

[0179] Or such as Figure 51 As shown, the moisture-absorbing and shrinking material 201 is interlaced on the upper and lower surfaces of the sheet 101, and the sheet 101 and the moisture-absorbing and shrinking material 201 are fixed by the adhesive mechanism 301 to form plasticized adhesive points 102; and at the same time, the opening mechanism 302 processes the opening 202 on the plasticized adhesive points 102.

[0180] The opening mechanism 302 and the bonding mechanism 301 are relatively mature in the prior art, and will not be described or limited here.

[0181] This application also proposes a sanitary product containing the aforementioned wet-active opening-modified material. The sanitary product may contain one or more of the aforementioned wet-active opening-modified material in its surface layer, core, waistband, three-dimensional support, waist patch, etc. However, it is not limited to these components; the aforementioned wet-active opening-modified material may also be used in other components of the sanitary product, and this is not limited thereto.

[0182] The performance of the moisture-absorbing opening material of this application is verified through several sets of experiments:

[0183] Example 1

[0184] A single yarn is taken, with its end flush with the opening. The sheet material is hot-air nonwoven fabric, made of plain weave nonwoven fabric containing 0.8D bicomponent short fibers, with a weight of 20g. The moisture-absorbing and shrinking material is D01 yarn, using a single-thread wiring method. The moisture-absorbing and shrinking liquid is physiological saline at a temperature of 37℃. The plasticizing and bonding points are square, with dimensions of 3mm*3mm, a longitudinal spacing of 12mm, and a transverse spacing of 6mm. The hot-air nonwoven fabric pile side and the moisture-absorbing and shrinking thread are centered and bonded at the plasticizing and bonding points. The opening is located in the center of the plasticizing and bonding points, cutting through the surface layer and the moisture-absorbing and shrinking material together. The opening is a narrow "I" slit, 3mm long and 0.01mm wide. The pile side of the hot-air nonwoven fabric is in contact with the core. The penetration and backflow of the surface layer are tested using 37℃ physiological saline. Under the shrinkage tension of the moisture-absorbing and shrinking yarn, the width of opening 202 changes from 0.01mm to 3mm, and the area of ​​opening 202 changes from 0.03mm². 2 It became 2.25mm 2 The opening 202 is like the front and back. Figure 5 and Figure 6 As shown.

[0185] As a control example 1-1, the remaining conditions are the same as above, except that no opening is set. Test data for three penetration tests and material backflow are presented.

[0186] The test method for triple penetration is as follows:

[0187] 1. Measuring apparatus and instruments

[0188] (1) YG814D Liquid Penetration Tester

[0189] (2) Paper cutter

[0190] (3) Standard absorbent pad (filter paper)

[0191] (4) Stopwatch

[0192] 2. Procedure

[0193] (1) Cut a 125*125mm sample and prepare 0.9% physiological saline for later use;

[0194] (2) Inject 25 mL of physiological saline into the funnel, adjust the opening and closing degree of the nozzle valve, then start the solenoid valve, and at the same time use a stopwatch to control the liquid flow rate to 25 mL within (3.5±0.25) s.

[0195] (3) Prepare 10 sheets of filter paper (FP / 4”X4” absorbent paper, smooth side up) stacked together as a standard absorbent pad, place them flat on the substrate, place the sample (use side up) directly above the filter paper, and then press the penetration plate directly above the sample. The center of the funnel, the center of the penetration plate, and the center of the sample overlap, and the funnel tip is located (45±1) mm above the instrument substrate.

[0196] (4) Reset the timer to zero. At 0 min, add 5 ml of test solution to the funnel using a pipette, open the drain valve, and after the liquid has completely penetrated the filter paper, read the first liquid penetration time, accurate to 0.1 s.

[0197] (5) Reset the timer to zero. At 1 minute, without replacing the filter paper, add 5 ml of test solution to the funnel using a pipette, open the drain valve, and after the liquid has completely penetrated the filter paper, read the second liquid penetration time, accurate to 0.1 s.

[0198] (6) Reset the timer to zero. At 2 minutes, without replacing the filter paper, add 5 ml of test solution to the funnel using a pipette, open the drain valve, and read the third liquid penetration time after the liquid has completely penetrated the filter paper, accurate to 0.1 s.

[0199] 3. Reference Standards

[0200] FZ / T 64046 2014 Hot-air process nonwoven fabrics

[0201] GB / T 24218.13-2010 Textiles - Nonwovens - Test Methods - Part 13: Determination of Liquid Penetration Time - Test Method for Material Re-bleeding:

[0202] 1. Measuring apparatus and instruments

[0203] (1) YG814D Liquid Penetration Tester

[0204] (2) Paper cutter

[0205] (3) Standard absorbent pad (filter paper)

[0206] (4) Stopwatch

[0207] (5) Electronic balance (accurate to 0.01g)

[0208] 2. Procedure

[0209] (1) Cut a 125*125mm sample and prepare a 0.9% physiological saline solution for later use;

[0210] (2) Inject 25 mL of physiological saline into the funnel, adjust the opening and closing degree of the nozzle valve, then start the solenoid valve, and at the same time use a stopwatch to control the liquid flow rate to 25 mL within (3.5±0.25) s.

[0211] (3) Prepare 10 sheets of filter paper (FP / 4”X4” absorbent paper, smooth side up) stacked together as a standard absorbent pad, place them flat on the substrate, place the sample (use side up) directly above the filter paper, and then press the penetration plate directly above the sample. The center of the funnel, the center of the penetration plate, and the center of the sample overlap, and the funnel tip is located (45±1) mm above the instrument substrate.

[0212] (4) Reset the timer to zero. At 0 min, add 5 ml of test solution to the funnel using a pipette and open the drain valve.

[0213] (5) When the timer is zeroed, after 1 minute, without replacing the filter paper, add 5 ml of test solution to the funnel with a pipette and open the drain valve.

[0214] (6) Reset the timer to zero. After 2 minutes, without replacing the filter paper, add 5 ml of test solution to the funnel using a pipette and open the drain valve.

[0215] (7) Remove the sample and filter paper from the penetration device together, and gently place the 4kg standard block on the sample within 5s. Start timing after pressing it down completely.

[0216] (8) After 3 minutes, carefully remove the pressure block within 5 seconds and wipe it dry;

[0217] (9) Weigh the two layers of filter paper (FP / 4”X4” absorbent paper, glossy side down), record the mass (m1) and place it on the sample, accurate to 0.001g;

[0218] (10) Gently place the 4kg standard block back onto the filter paper within 5s. After 2min, carefully remove the block within 5s, weigh the two layers of filter paper again, and record the mass (m2) accurate to 0.001g.

[0219] (11) Sample re-permeation amount = m2 - m1

[0220] 3. Reference Standards

[0221] GB / T 24218.14-2010 Textiles - Nonwovens - Test Methods - Part 14: Determination of the moisture repellency of covering materials

[0222] Based on the test data of the three penetrations and surface layer backflow of the material using the above method, the data in Table 5 are obtained:

[0223]

[0224] Table 5. Test data of three-stage penetration and surface layer backflow of materials.

[0225] The data in the table shows that, compared with the control example, the product of Embodiment 1 of this application has a 61% reduction in the second penetration time, a 35% reduction in the third penetration time, and a significant decrease in the amount of reabsorption.

[0226] Example 2

[0227] The sheet material is spunbond nonwoven fabric, weighing 20g, with an opening. The moisture-absorbing and shrink-absorbing material is D01 yarn, using a single-strand weave method, and the moisture-absorbing and shrink-absorbing liquid temperature is 37℃. The plasticized bonding point size is 3mm*3mm, with a longitudinal spacing of 12mm and a transverse spacing of 6mm. The sheet material and the moisture-absorbing and shrink-absorbing material are bonded at the plasticized bonding points. The number of yarns on both sides of the opening is different, such as... Figure 38 There is one thread on the left and two threads on the right. At the center of the plasticized bonding point, the sheet and the moisture-absorbing shrink-off yarn are cut together to form an opening. The side of the non-woven fabric with the moisture-absorbing shrink-off material is brought into contact with the core. After being soaked in urine, under the shrinkage tension of the moisture-absorbing shrink-off yarn, the opening widens by 1mm on the left and 2mm on the right. The opening area is reduced from 2mm². 2 Change to 4mm 2 The opening changes to opening 202, facilitating the rapid and smooth passage of viscous excretions such as menstrual blood and loose stools from the surface layer to the layer below. Once the opening is open, it resembles... Figure 39 As shown.

[0228] Example 3

[0229] The sheet material is preferably hot-air fabric, with the side containing 0.8D fibers used as the plain weave nonwoven fabric side, weighing 20g. The back side uses plain weave hot-air fabric containing 1.2D fibers, also weighing 20g. The moisture-absorbing and shrinking material is DO2 yarn, using a single-strand weave. The moisture-absorbing and shrinking liquid is physiological saline at 37℃. The plasticizing and bonding points are 3mm*3mm in size, with a longitudinal spacing of 6mm and a transverse spacing of 6mm. The sheet material and the moisture-absorbing and shrinking yarn are bonded at the plasticizing and bonding points. The opening is located at the center of the plasticizing and bonding point, where the sheet material and the moisture-absorbing and shrinking yarn are cut together. Figure 9 As shown. The opening is rectangular, 3mm long and 1mm wide. The back side of the nonwoven fabric is placed in contact with the core, and adhesive is sprayed to replace and attach it to the product. The national standard absorption rate and rewetting amount are tested, and the surface layer thickness before and after the test is measured.

[0230] As a comparative example 3-1, the remaining conditions were the same as above, except that no opening was provided. As a comparative example 3-2, the remaining conditions were the same as above, except that no moisture-absorbing and shrink-absorbing material was provided. The products of comparative examples 3-1 and 3-2 were sprayed with adhesive and adhered to the core. The national standard absorption rate and rewetting amount were tested, and the surface layer thickness before and after the test was measured.

[0231] National Standard Test Method for Rewetting of Diapers

[0232] 1. Measuring instruments and devices

[0233] Diaper Absorption Rate Tester T025A (National Standard)

[0234] 2. Procedure

[0235] 1) Calibrate all instrument parameters

[0236] 2) Weigh the absorbent filter paper.

[0237] 3) Install the product on the base.

[0238] 4) Place the base on the testing instrument and install the liquid addition module.

[0239] 5) Select test specifications

[0240] 6) Test Startup

[0241] 7) Replace the pressurization module as prompted.

[0242] 8) Weigh the re-absorption filter paper after pressurization.

[0243] 3. Reference Standards

[0244] GB / T 28004.1—2021 Diapers Part 1: Baby Diapers

[0245] The test data is shown in Table 6:

[0246] Absorption per second Secondary absorption / s Reabsorption rate / g Thickness before testing (mm) Thickness after testing Compare with Example 3-1 21 65 12.2 1.44 1.29 Compare with Example 3-2 19 58 12.1 1.43 1.24 Example 3 15 53 5 1.46 1.64

[0247] Table 6 Comparison of National Standard Test Performance

[0248] As shown in the table above, compared to Control Example 3-1, Example 3 showed an 18-28% increase in absorption rate, a 59% decrease in reabsorption, and a 12.3% increase in the height of the floral pattern. Compared to Control Example 3-1, Control Example 3-2 showed almost no change in absorption rate, reabsorption, or floral height before and after the test. Compared to Control Example 3-2, Example 3 showed an 8-22% increase in absorption rate, a 59% decrease in reabsorption, and a 13% increase in the height of the floral pattern.

[0249] Example 4

[0250] The sheet material is selected as hot air fabric, using 0.8D plain weave nonwoven fabric with a weight of 20g. The inner layer is 1.2D plain weave hot air fabric with a weight of 20g. The flat layer is on one side of the inner layer, using 2D plain weave nonwoven fabric with a weight of 16g. The moisture-absorbing and shrinking material is S01 yarn, using a single-thread wiring method, and the moisture-absorbing and shrinking liquid temperature is 37℃. The plasticizing bonding point size is 3mm*3mm, with a longitudinal spacing of 6mm and a transverse spacing of 6mm. The sheet material, moisture-absorbing and shrinking yarn, and inner layer are bonded at the plasticizing bonding points. At the center of the plasticizing bonding point, the surface layer and moisture-absorbing and shrinking yarn are cut together, creating a slit opening. The opening direction is consistent with the transverse direction of the nonwoven fabric, with a length of 2mm and a width of 0.1mm. The flat layer and D01 yarn are bonded at the plasticizing bonding points. At the center of the plasticizing bonding point, the flat layer and yarn are cut together, creating an H-shaped opening in the direction of nonwoven fabric use. Figure 16 Both the longitudinal and transverse opening lengths are 3mm.

[0251] The inner layer of the embossed double layer is bonded to the flat layer, and then the flat layer is brought into contact with the core.

[0252] After absorption with 80ml of artificial urine at 37℃, the opening of the embossed double layer increased from 0.1mm to 1mm, and the opening area increased from 0.1mm². 2 The opening is 0.25mm. 2 At this time, the yarn loses its function and closes, the opening width of the planar layer increases from 0.1mm to 4mm, and the opening area decreases from 0.1mm². 2 It becomes 10mm 2 ,like Figure 13 The overall opening is like Figure 14 The same method can be used: flipping the surface layer, material, and opening; or using the same opening with different specifications of moisture-absorbing and shrink-absorbing materials for the upper and lower layers. The upper opening at the plasticized bonding point, after receiving excrement, is opened to guide the excrement under the surface layer before closing, improving the dryness of the surface layer and reducing backflow of excrement.

[0253] Example 5

[0254] The sheet material is selected as hot-air fabric, using 0.8D plain weave nonwoven fabric with a weight of 20g. The moisture-absorbing and shrinking material consists of Y01 and L01 yarns, arranged in a parallel weave pattern. The moisture-absorbing and shrinking liquid temperature is 37℃. The plasticizing bonding point size is 3mm*3mm, with a longitudinal spacing of 12mm and a transverse spacing of 6mm. The sheet material and moisture-absorbing and shrinking yarns are bonded at the plasticizing bonding point. The sheet material and moisture-absorbing and shrinking yarns are cut together at the center of the plasticizing bonding point. The opening is a slit, 4mm long and 0.1mm wide. The nonwoven fabric's napp side contacts the core. When 80ml of physiological saline is poured in for the first time, Y01 contracts and pulls the opening, with a maximum width of 4mm. After the liquid is absorbed, the Y01 yarn loses its pulling effect, and the opening closes. At this time, the L01 yarn has not yet started to shrink. When 80ml of physiological saline is poured in for the second time, L01 contracts and pulls the opening, maintaining this until the third addition of liquid. When 80ml of physiological saline is added for the third time, after absorption, the L01 yarn loses its pulling effect, and the opening closes. The opening and closing mechanism effectively solves the problem of keeping the surface dry after multiple uses, allowing for multiple uses even in scenarios involving multiple bowel movements.

[0255] Example 6

[0256] The sheet material was selected as hot-air fabric, and the moisture-absorbing shrink yarn was D01 with a diameter of 0.17mm. The plasticized bonding point size was 5mm*5mm, and the spacing between the bonding points was 15mm. The sheet material and the moisture-absorbing shrink yarn were bonded at the plasticized bonding points. The thickness of the hot-air fabric and yarn at the plasticized bonding points, and the width of the yarn before and after liquid saturation are measured as shown in Table 7. The surface layer was placed on a 20g PE film, and 10ml of physiological saline was added to completely saturate the moisture-absorbing shrink yarn between at least 3 plasticized bonding points. The thickness, yarn width, and the diameter and length of the free section of the yarn at the plasticized bonding points after complete shrinkage were measured.

[0257]

[0258] Table 7. Dimensional Changes at Plasticized and Non-Plasticized Bonding Points of Yarn

[0259] Therefore, it can be seen that the thickness and length of the yarn at the plasticized bonding point remained unchanged before and after moisture absorption. The yarn in the non-bonded area shrank by 60% and expanded 3.8 times after moisture absorption. That is, the yarn in the bonding area has almost no moisture absorption expansion and shrinkage due to the plasticizing treatment.

[0260] Example 7

[0261] The sheet material is spunbond nonwoven fabric with a weight of 20g. The moisture-absorbing and shrinking material is D01 yarn, using a single-thread wiring method, and the moisture-absorbing and shrinking liquid temperature is 37℃. The plasticizing and bonding points are adjacent, measuring 2*3mm with a spacing of 2mm. The processing method involves simultaneous plasticizing and bonding, and opening. The bonding and opening mechanism is concave, with each side of the bonding component measuring 1mm*3mm. An opening mechanism with a spacing of 2mm is provided at the bottom edge of the concave shape. Figure 37 As shown, the longitudinal spacing of the bonding area is 12mm, and the transverse spacing is 6mm. The sheet and the moisture-absorbing shrink yarn are opened simultaneously during plasticizing and bonding, and no free ends of the yarn are exposed at the opening. Compared with the two-step method of plasticizing and bonding first and then opening, and the two-step method of opening and bonding first, the one-step method of plasticizing and bonding and opening simultaneously is simpler in process and requires less equipment.

[0262] Example 8

[0263] The sheet material is spunbond nonwoven fabric with a weight of 20g. The moisture-absorbing and shrink-absorbing material is D01 yarn, using a single yarn that crosses over the sheet and is applied to both the top and bottom surfaces. A processing method of opening first and then plasticizing and bonding is used. The plasticizing and bonding points are 3mm*3mm in size, with a longitudinal spacing of 12mm and a transverse spacing of 6mm. The sheet material and the moisture-absorbing and shrink-absorbing material are bonded at these points. Figure 41 As shown. At the center of the plasticized bonding point, the sheet and the moisture-absorbing shrinkage material are cut together to form an opening, which is a narrow slit with a width of 0.01 mm. The side of the nonwoven fabric with the moisture-absorbing shrinkage material is placed in contact with the core, and a 20 g PE bottom film is placed under the core. Using 37°C physiological saline as simulated urine, 80 ml of solution is added for testing. Under the shrinkage tension of the moisture-absorbing shrinkage yarn, the opening width changes from 0.01 mm to 2.5 mm.

[0264] Example 9

[0265] The sheet material is hot-air nonwoven fabric with a weight of 20g. The moisture-absorbing and shrink-absorbing material is DO2 yarn, using two yarns laid inside the thick sheet. A processing method of first plasticizing and bonding, then opening, is used. The plasticizing and bonding points are 3mm*3mm in size, with a longitudinal spacing of 12mm and a transverse spacing of 6mm. The sheet material and the moisture-absorbing and shrink-absorbing material are bonded at the plasticizing and bonding points, as shown... Figure 42 As shown. At the center of the plasticized bonding point, the sheet and the moisture-absorbing shrinkage material are cut together to form an opening, which is a narrow slit with a width of 0.01 mm. The side of the nonwoven fabric with the moisture-absorbing shrinkage material is placed in contact with the core, and a 20 g PE bottom film is placed under the core. Using 37°C physiological saline as simulated urine, 80 ml of solution is added for testing. Under the shrinkage tension of the moisture-absorbing shrinkage yarn, the opening width changes from 0.01 mm to 2.5 mm.

[0266] Example 10

[0267] A type of diaper comprises a hydrophilic surface layer, an absorbent core, and a water-repellent bottom film. The core is a 500g pre-fabricated core, the bottom film is a 20g PE film, the hydrophilic surface layer is made of hot-air nonwoven fabric with a basis weight of 20g, and the moisture-absorbing and shrink-fit material is DO2 yarn, laid as a single thread on one side of the sheet. The diaper employs a pre-plasticizing and bonding process followed by opening. The plasticizing and bonding points are complete flat surfaces with dimensions of 3mm x 3mm, a longitudinal spacing of 12mm, and a transverse spacing of 6mm. The sheet and the moisture-absorbing and shrink-fit material are bonded at the plasticizing and bonding points. The sheet and the moisture-absorbing and shrink-fit material are then cut together to form an opening, which is a narrow slit with a width of 0.01mm.

[0268] The moisture-absorbing and shrinking material on both sides of the opening has no free ends, such as... Figure 5 As shown.

[0269] As a comparative example 10-1, the same arrangement as above is used, except that the plasticized bonding points are two adjacent areas spaced 1mm apart, each 1mm*3mm in size. The area between the plasticized bonding points that is not plasticized is 1mm*3mm. In the middle of the non-plasticized bonding area, the sheet and the moisture-absorbing shrinkage material are cut together to form an opening. The opening is a slit with a width of 0.01mm. Figure 25 As shown, the moisture-absorbing and shrinking material on both sides of the opening has a 0.5mm long free end 201-2. Here, the free end 201-2 refers to the fact that this part of the moisture-absorbing and shrinking material is not plasticized and bonded to the sheet.

[0270] Finished products were tested using national standard testing instruments for diapers, and changes in opening size were measured. Test data are shown in Table 8.

[0271] Absorption per second Secondary absorption / s Opening width / mm Reabsorption rate / g Example 10 15 52 2.5 5 Compare with Example 10-1 17 57 1.5 7.1

[0272] Table 8. Performance Comparison of Materials with Free Ends and Non-Free Ends at Plasticized Bonding Points

[0273] As shown in the table above, compared with Example 10-1, Example 10 showed a 12% increase in primary absorption rate, a 9% increase in secondary absorption rate, a 71% increase in opening width, and a 42% decrease in reabsorption. Observation revealed that in Comparative Example 10-1, because the ends of the moisture-absorbing shrinkage material were not fixed, this portion of the material had no traction effect on the surface layer, making it impossible to fully open the opening. Further observation showed that after absorption, especially after multiple absorptions, the unplasticized free ends of the moisture-absorbing shrinkage material melted and broke off, thus affecting the fixation between the moisture-absorbing shrinkage material and the surface layer material, causing the opening to fail and close.

[0274] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A wet-active open-cell material, characterized in that, Includes a sheet (101), and the sheet (101) is provided with a moisture-absorbing and shrink-absorbing material (201); Part of the moisture-absorbing and shrinking material (201) is fixed to the sheet (101) through plasticized adhesive points (102); The plasticized adhesive point (102) is provided with an opening (202), and the opening (202) penetrates the plasticized adhesive point (102) and the moisture-absorbing and shrinking material (201) at the plasticized adhesive point (102).

2. A wet-active open-cell material, characterized in that, Includes a sheet (101), the surface of which is provided with a moisture-absorbing and shrink-absorbing material (201); Part of the moisture-absorbing and shrinking material (201) is fixed to the sheet (101) through plasticized adhesive points (102); The plasticized adhesive point (102) is provided with an opening (202), and the opening (202) penetrates the plasticized adhesive point (102) and the moisture-absorbing and shrinking material (201) at the plasticized adhesive point (102).

3. The wet-active open-cell material according to claim 1 or 2, characterized in that: The moisture-absorbing and shrink-fitting material (201) has an end at or near the opening (202); All ends are fixed to the sheet (101) through plasticized adhesive points (102), and the ends are non-free ends (201-1); The projection of the end on the sheet (101) is located within the projection area of ​​the plasticized adhesive point (102) on the sheet (101).

4. The wet-active opening-changing material according to claim 3, characterized in that: The non-free end (201-1) of the moisture-absorbing and shrinking material (201) is flush with or has a gap from the edge of the opening (202).

5. The wet-active open-cell material according to claim 1 or 2, characterized in that: The area outside the plasticized bonding point (102) is the non-plasticized bonding area, and the remaining moisture-absorbing and shrinking material (201) and the sheet (101) are independent of each other in the non-plasticized bonding area; When exposed to moisture, the moisture-absorbing shrinkage material (201) in the plasticized bonding area does not shrink, while the moisture-absorbing shrinkage material (201) in the non-plasticized bonding area shrinks when exposed to moisture, pulling the moisture-absorbing shrinkage material (201) in the plasticized bonding area and causing the opening (202) to expand.

6. The wet-active opening-changing material according to claim 5, characterized in that: The length of the moisture-absorbing and shrinking material (201) fixed at the plasticized bonding point (102) and the sheet (101) is L1, and the length of the non-plasticized bonding area of ​​the moisture-absorbing and shrinking material (201) is L2, wherein L1:L2 = (10:1) ~ (1:10).

7. The wet-active opening-changing material according to claim 1 or 2, characterized in that: The sheet (101) and the moisture-absorbing and shrinking material (201) are melted by one or more of the following methods: high temperature, high pressure, ultrasonic wave, and laser. After the sheet (101) and the moisture-absorbing and shrinking material (201) permeate each other and are cooled, plasticized and fixed, the plasticized adhesive point (102) is formed.

8. The wet-active opening-changing material according to claim 7, characterized in that: The density of the plasticized adhesive points (102) is higher than that of the non-plasticized adhesive areas; the softness, thickness, and liquid permeability of the plasticized adhesive points (102) are lower than those of the non-plasticized adhesive areas.

9. The wet-active open-cell material according to claim 1 or 2, characterized in that: The moisture-absorbing and shrinking material (201) is one or more of the following: yarn made of PVA fiber, moisture-absorbing and shrinking strip made of PVA resin, or moisture-absorbing and shrinking cloth; When the moisture-absorbing shrinkage material (201) is a moisture-absorbing shrinkage strip or a moisture-absorbing shrinkage cloth, the thickness of the moisture-absorbing shrinkage strip or the moisture-absorbing shrinkage cloth is 0.1 to 5 mm, and the basis weight is 0.01 to 500 g / m². 2 ; When the moisture-absorbing and shrinking material (201) is yarn, the yarns on both sides of the opening (202) are of the same or different thickness, and / or the same or different number, and / or parallel or form an angle along the length extension direction.

10. The wet-active opening-changing material according to claim 1 or 2, characterized in that: The moisture absorption response time of the moisture-absorbing and shrinking material (201) is 0 to 60 seconds.

11. The wet-active opening-changing material according to claim 1 or 2, characterized in that: The moisture-absorbing and shrinking material (201) has a moisture-absorbing and shrinking rate of 1-95%.

12. The wet-active opening-changing material according to claim 1 or 2, characterized in that: The opening (202) is one or more of the following: a straight slit, a cross slit, an H-shaped slit, a rectangular slit, an elliptical hole, a rectangular hole, a trapezoidal hole, an elliptical hole connected to a straight slit, an elliptical hole connected to a cross slit, and the two ends of the slit connected to a circular hole. The slits are located entirely at the plasticized adhesive point (102), or partially in the non-plasticized adhesive area of ​​the sheet (101); The surface area of ​​the opening (202) accounts for 1 to 99% of the surface area of ​​the plasticized adhesive point (102).

13. The wet-active opening-changing material according to claim 2, characterized in that: The moisture-absorbing and shrinking material (201) is disposed on the upper or lower surface of the sheet (101); Alternatively: the moisture-absorbing and shrink-absorbing material (201) passes through the sheet (101) and is disposed on both the upper and lower surfaces of the sheet.

14. A hygiene product, characterized in that: The sanitary product contains the wet-active open-ended material as described in any one of claims 1-13.

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