Hygienic product, wet activity opening change material and processing method thereof

Abstract

The invention relates to the technical field of special performance products and composite materials, in particular to a hygienic product, a wet activity opening change material and a processing method thereof.The wet activity opening change material comprises a sheet, and a moisture absorption shrinkage material is arranged on the surface 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] The invention relates to the technical field of special performance products and composite materials, and in particular to a sanitary product, a wet-active opening-changing material and a processing method thereof. Background Art

[0002] Common surface materials available include Figures 1 to 3 As shown, Figure 1 It is a single layer of material with plasticized bonding points 102 processed on the sheet 101; Figure 2 The double-layer embossed material is a material in which a bulge 103 is processed on a sheet 101, and the sheet 101 and the inner layer 104 are bonded and fixed by plasticized bonding points 102. Figure 3 Shown is Figure 2 A cross-sectional view of a double-layer embossed material is shown.

[0003] The existing materials are provided with plasticized bonding points 102 mainly for two purposes: one is to improve the visual beauty of the overall appearance of the material, and the other is to play a certain role in fixing and supporting the material.

[0004] When the existing surface layer material is made into diapers, urine can soak the surface layer and reach below the surface layer, but when there is loose stool, the viscous and particulate-containing mixture cannot pass through the surface layer, and such mixture will remain on the surface layer. When such mixture comes into contact with the skin, it will cause itching, redness and swelling of the skin. Similarly, when the existing surface layer material is made into sanitary napkins, because menstrual blood contains tissues such as mucous membranes, it will be more viscous and easy to coagulate, so it is more difficult for menstrual blood to pass through the surface layer and be absorbed by the core.

[0005] In order to solve the above problems, the existing surface layer materials are processed with through holes 105. However, the surface layer materials processed with through holes 105 are prepared based on "moisture absorption", or in other words, these products only consider the state that the product, the flow guide and the core should have in the wet state, but do not consider what the dry state should be when consumers wear these absorbent products. Existing products cannot be comfortable to wear when dry.

[0006] for example, Figure 4 It is a schematic diagram of processing a through hole 105 on the plasticized bonding point 102 of the double-layer embossed material. For such products, if the through hole 105 has a larger aperture, the fixing and supporting effect of the bonding point will decrease, and if the through hole 105 has a smaller aperture, it will be difficult for solid matter to pass through the surface layer.

[0007] Faced with the above problems, the applicant filed a patent application with application number 2023114041928 on October 26, 2023, entitled "A hygroscopic open-cell product and sanitary product". In this scheme, a hygroscopic shrinkage material is disclosed, and the hygroscopic shrinkage material is arranged on at least one side of the surface layer and fixed to the surface layer on at least one side of the opening. When the hygroscopic shrinkage material absorbs liquid, it shrinks, thereby pulling the surface layer and allowing the opening to be pulled open to facilitate the passage of solid objects through the surface layer.

[0008] From the patent application with application number 2023114041928, entitled A Hygroscopic Open-Pore Product and Sanitary Products, it can be learned that the applicant sets the hygroscopic shrinkage material on both sides of the opening, and the ends of the hygroscopic shrinkage material are free ends without fixed ends. Further research found that due to the existence of free ends, the hygroscopic shrinkage material in this product has non-traction parts on both sides of the opening, which will result in the opening not being able to be fully and effectively opened after moisture absorption. In addition, the hygroscopic shrinkage material may have the problem of poor fixation with the sheet material. After moisture absorption, the hygroscopic shrinkage yarn used to pull the opening may be displaced or fall off at a fixed position, thereby reducing or losing the traction effect on the surface layers on both sides of the opening. The opening will not be fully opened or will be reopened after opening, resulting in the hygroscopic opening function being affected, and also affecting the passage of sticky or lumpy objects from the opening through the surface layer. Summary of the invention

[0009] To solve the above problems, the object of the present invention is to provide a sanitary product, a wet-activated opening change material and a processing method thereof.

[0010] The technical solution provided by the present invention is:

[0011] In the first aspect, a moisture-activated opening change material includes a sheet material, wherein a hygroscopic shrinkage material is arranged inside the sheet material; part of the hygroscopic shrinkage material is fixed to the sheet material through plasticized bonding points; the plasticized bonding points are provided with openings, and the openings penetrate the plasticized bonding points and the hygroscopic shrinkage material at the plasticized bonding points.

[0012] In the second aspect, a moisture-activated opening-changing material includes a sheet material, on the surface of which a hygroscopic shrinkage material is arranged; part of the hygroscopic shrinkage material is fixed to the sheet material through plasticized bonding points; the plasticized bonding points are provided with openings, which penetrate the plasticized bonding points and the hygroscopic shrinkage material at the plasticized bonding points.

[0013] As an optional technical solution of the first or second aspect, the sheet material and the hygroscopic shrinkage material are melted by one or more methods of high temperature, high pressure, ultrasonic wave, and laser, and the sheet material and the hygroscopic shrinkage material are mutually infiltrated, cooled, plasticized, and fixed to form the plasticized bonding point. Under the action of high temperature, high pressure, ultrasonic wave or laser, the sheet material and the hygroscopic shrinkage material are partially melted in the local treatment area, the hygroscopic shrinkage material is dehydrated and loses its hygroscopic expansion property, the sheet material penetrates into the hygroscopic material, and after cooling, the sheet material and the hygroscopic shrinkage material are fixed. The treated part of the hygroscopic shrinkage material at the plasticized bonding point loses its hygroscopic expansion and contraction property, and thus can be better fixed at the plasticized bonding point.

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

[0015] As an optional technical solution of the first or second aspect, the hygroscopic shrinkage material has an end at or near the opening; the end of the hygroscopic shrinkage material refers to the end formed by the material being disconnected, and after the opening at the plasticized bonding point, the connection part of the hygroscopic shrinkage material and the sheet is fixed;

[0016] All the ends are fixed to the sheet material through plasticized bonding points, and the ends are non-free ends;

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

[0018] Optionally, the non-free end of the moisture absorption and shrinkage material is flush with the edge of the opening or there is a gap between them.

[0019] As an optional technical solution of the first or second aspect, the area outside the plasticized bonding point is a non-plasticized bonding area, and the remaining hygroscopic shrinkage material and the sheet are independent of each other in the non-plasticized bonding area; when wet, the hygroscopic shrinkage material in the plasticized bonding area does not shrink, and the hygroscopic shrinkage material in the non-plasticized bonding area shrinks when wet, pulling the hygroscopic shrinkage material in the plasticized bonding area to expand the opening.

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

[0021] As an optional technical solution of the second aspect, the hygroscopic shrinkage material is arranged on one side of the upper surface and / or lower surface of the sheet.

[0022] Or the hygroscopic shrinkage material passes through the sheet and is arranged on both the upper surface and the lower surface of the sheet.

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

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

[0025] As an optional technical solution of the first or second aspect, the hygroscopic shrinkage material is one or more of a hygroscopic shrinkage yarn made of hygroscopic expansion and contraction PVA fiber, a hygroscopic shrinkage strip made of hygroscopic expansion and contraction PVA resin, or a hygroscopic shrinkage cloth.

[0026] As an optional technical solution of the first or second aspect, the raw material of the hygroscopic shrinkage material is hygroscopic expansion and contraction PVA fiber, whose degree of polymerization is 100-10000 and alcoholysis degree is 10%-100%. The higher the degree of polymerization and alcoholysis degree, the higher the energy required for the molecular chain to unfold and the worse the hygroscopicity.

[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 force, and the lower the hygroscopicity.

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

[0029] Optionally: Hygroscopic expansion and contraction The PVA yarn absorbs moisture and expands and contracts in water at about 20°C.

[0030] Optionally: Hygroscopic expansion and contraction The PVA yarn absorbs moisture and expands and contracts in water at about 40°C.

[0031] Optionally: Hygroscopic expansion and contraction The PVA yarn absorbs moisture and expands and contracts in water at about 60°C.

[0032] Optionally: Hygroscopic expansion and contraction The PVA yarn absorbs moisture and expands and contracts in water at about 80°C.

[0033] After the molecular chains in the hygroscopic shrinkage material absorb moisture, the water molecules diffuse and penetrate between the molecular chains, first moving the chain segments, causing the entire molecular chain to loosen, disentangle, and expand. Theoretically, the hygroscopic shrinkage material can expand and shrink infinitely in an infinite amount of time and in an infinite amount of solution.

[0034] In a limited amount of solution and limited time, the hygroscopic shrinkage material will not expand and shrink infinitely. Instead, when the hygroscopic shrinkage material absorbs moisture, water molecules diffuse into the hygroscopic shrinkage material, and the fibers in the hygroscopic shrinkage material expand in the diameter direction and become tighter. The gaps between the fibers become smaller, and the bending of the fibers in the middle increases, causing the hygroscopic shrinkage material to wrinkle and shrink toward the middle in the length direction. In short, hygroscopic expansion and contraction fibers refer to fibers that expand in the diameter direction and shrink in the length direction due to moisture absorption.

[0035] The hygroscopic shrinkage material can be treated to improve the crosslinking degree and hygroscopic expansion property, so that the hygroscopic shrinkage material will not expand and shrink infinitely. Optionally, the hygroscopic shrinkage material is treated with high temperature or high pressure, or the hygroscopic shrinkage material is treated with high temperature and high pressure, or the hygroscopic shrinkage material is treated with laser, or the hygroscopic shrinkage material is treated with ultrasonic.

[0036] When the hygroscopic shrinkage material is a hygroscopic shrinkage strip or a hygroscopic shrinkage cloth, the thickness of the hygroscopic shrinkage strip or the hygroscopic shrinkage cloth is 0.1 to 5 mm, and the gram weight is 0.01 to 500 g / m 2 ;

[0037] When the hygroscopic shrinkage material is hygroscopic shrinkage yarn, the yarns on both sides of the opening have the same or different thicknesses, and / or the same or different numbers, and / or are parallel or form an angle along the length extension direction.

[0038] As an optional technical solution of the first or second aspect, the hygroscopic response time of the hygroscopic shrinkage material is 0 to 60 seconds.

[0039] As an optional technical solution of the first or second aspect, the hygroscopic shrinkage rate of the hygroscopic shrinkage material is 1 to 95%.

[0040] As an optional technical solution of the first or second aspect, the sheet material is one or more of a fiber product, a paper product, and a film material, and the sheet material has a gram weight of 0.1 to 500 g / m 2 , thickness is 0.001~50mm.

[0041] As an optional technical solution of the first or second aspect, the opening is one or more of 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 circular holes connected at both ends of a slit.

[0042] Optionally, the slits are all located at the plasticized bonding points, or partially located at the non-plasticized bonding area of ​​the sheet; the surface area of ​​the openings accounts for 1 to 99% of the surface area of ​​the plasticized bonding points.

[0043] As technical solutions for opening, the opening can be done by cutting, turning, milling, planing, grinding, cutting, punching, drilling, extruding, stretching, pushing, pinning, boring, ironing, laser, chemical corrosion, vacuum suction, heavy ion, etc.

[0044] In a third aspect, a method for processing the wet-activated opening-changing material described in the first aspect, the second aspect, or any optional technical solution of the first aspect and the second aspect comprises:

[0045] The hygroscopic shrinkage material and the sheet are stacked; the sheet and the hygroscopic shrinkage material are first fixed by a bonding mechanism to form a plasticized bonding point; and an opening is then processed on the plasticized bonding point by an opening mechanism;

[0046] Or: stacking the hygroscopic shrinkage material and the sheet; firstly processing openings on the sheet and the hygroscopic shrinkage material by an opening mechanism; then fixing the sheet and the hygroscopic shrinkage material by a bonding mechanism to form a plasticized bonding point;

[0047] Or: stacking the hygroscopic shrinkage material and the sheet; processing openings on the sheet and the hygroscopic shrinkage material through an opening mechanism, and simultaneously fixing the sheet and the hygroscopic shrinkage material through a bonding mechanism to form a plasticized bonding point.

[0048] Or: laying the hygroscopic shrinkage material inside the sheet; firstly fixing the sheet and the hygroscopic shrinkage material by a bonding mechanism to form a plasticized bonding point; and then processing an opening at the plasticized bonding point by an opening mechanism;

[0049] Or: laying the hygroscopic shrinkage material inside the sheet; firstly processing openings on the sheet and the hygroscopic shrinkage material by an opening mechanism; then fixing the sheet and the hygroscopic shrinkage material by a bonding mechanism to form a plasticized bonding point;

[0050] Or: laying the hygroscopic shrinkage material inside the sheet; fixing the sheet and the hygroscopic shrinkage material by a bonding mechanism to form a plasticized bonding point; and simultaneously processing an opening at the plasticized bonding point by an opening mechanism;

[0051] Or; interlacing the hygroscopic shrinkage material on the upper and lower surfaces of the sheet; fixing the sheet and the hygroscopic shrinkage material by a bonding mechanism to form a plasticized bonding point; processing an opening on the plasticized bonding point by an opening mechanism;

[0052] Or; interlacing the hygroscopic shrinkage material on the upper and lower surfaces of the sheet; processing openings on the plasticized bonding points through an opening mechanism; fixing the sheet and the hygroscopic shrinkage material through a bonding mechanism to form plasticized bonding points;

[0053] Or; interlacing the hygroscopic shrinkage material on the upper and lower surfaces of the sheet; processing openings on the plasticized bonding points through an opening mechanism; and simultaneously fixing the sheet and the hygroscopic shrinkage material through a bonding mechanism to form plasticized bonding points.

[0054] In a fourth aspect, a sanitary product comprises the moisture-activated opening-changing 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 the present invention has the following beneficial effects:

[0056] The end of the hygroscopic shrinkage material of the present invention is plasticized and fixed to the sheet at the plasticized bonding point, so that the end of the hygroscopic shrinkage material loses its hygroscopic expansion and contraction, and the other parts of the hygroscopic shrinkage material are not fixed to the non-plasticized bonding point area of ​​the sheet. When the hygroscopic shrinkage material absorbs liquid, the hygroscopic shrinkage material located in the non-plasticized bonding point area of ​​the sheet shrinks, and the end of the hygroscopic shrinkage material located in the plasticized bonding point area does not produce hygroscopic expansion and contraction, so that the contraction of the hygroscopic shrinkage material causes the opening opened on the plasticized bonding point to open and become larger, so that solids and viscous substances can enter the core or other parts below the surface layer through the opened and enlarged opening formed by the surface layer. Since the hygroscopic shrinkage material fixed at the plasticized bonding point loses its hygroscopic expansion and contraction, it will not lose its fixing effect due to hygroscopic expansion, thereby ensuring that when the amount of liquid is large, the opening will not be closed due to the loss of the traction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of a single-layer material in which plasticized bonding points are processed on a sheet in the prior art;

[0058] Figure 2 It 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 It is a schematic diagram of a case where a through hole is provided at the plasticized bonding point of a double-layer embossed material in the prior art;

[0061] Figure 5 This is a schematic diagram of an embodiment of the present application in which the end of the hygroscopic shrinkage material is flush with the opening;

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

[0063] Figure 7 This is a schematic diagram of a case where there is a distance between the end of the hygroscopic shrinkage material and the opening in one embodiment of the present application;

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

[0065] Fig. 9 This is a schematic diagram of an embodiment of the present application in which the opening is a rectangular hole and the end of the hygroscopic shrinkage material is flush with the opening;

[0066] Fig.10 for Fig. 9 Schematic diagram of the middle opening when it is open;

[0067] Fig.11 This is a schematic diagram of an embodiment of the present application in which the opening is a rectangular hole and there is a distance between the end of the hygroscopic shrinkage material and the opening;

[0068] Fig.12 for Fig.11 Schematic diagram of the middle opening when it is open;

[0069] Fig.13 This is a schematic diagram of two plasticized bonding points adjacent to each other in one embodiment of the present application;

[0070] Fig.14 for Fig.13 Schematic diagram of the middle opening when it is open;

[0071] Fig.15 This is a schematic diagram of the plasticized bonding points contacting each other in one embodiment of the present application;

[0072] Fig.16 for Fig.15 Schematic diagram of the middle opening when it is open;

[0073] Fig.17 This is a schematic diagram of a plasticized bonding point in a circular shape in one embodiment of the present application;

[0074] Fig.18 for Fig.17 Schematic diagram of the middle opening when it is open;

[0075] Fig.19 This is a schematic diagram of a case where one side of the yarns on both sides of the opening is thicker than the other side in one embodiment of the present application;

[0076] Fig. 20 for Fig.19 Schematic diagram of the middle opening when it is open;

[0077] Fig.21 This is a schematic diagram of the hygroscopic shrinkage materials on both sides of the opening in parallel in one embodiment of the present application;

[0078] Fig. 22 for Fig.21 Schematic diagram of the middle opening when it is open;

[0079] Fig.23 This is a schematic diagram of an embodiment of the present application in which the extended lines of the hygroscopic shrinkage materials on both sides of the opening form an angle;

[0080] Fig.24 for Fig.23 Schematic diagram of the middle opening when it is open;

[0081] Fig.25 A schematic diagram of a comparative example in which a hygroscopic shrinkage material has a free end;

[0082] Fig.26 This is a schematic diagram of bonding length and pulling length in one embodiment of the present application;

[0083] Fig. 27 This is a schematic diagram of the opening in this application when the opening is a slit of different shapes;

[0084] Fig.28 for Fig. 27 Schematic diagram of the middle opening when it is open;

[0085] Fig.29 It is a schematic diagram of the openings in this application when they are in different hole shapes;

[0086] Fig.30 for Fig.29 Schematic diagram of the middle opening when it is open;

[0087] Fig.31 A schematic diagram of two layers of wet-activated opening change material being combined in one embodiment of the present application;

[0088] Fig.32 for Fig.31 Schematic diagram of the middle opening showing a small top and a large bottom;

[0089] Fig.33 This is a schematic diagram of two layers of wet-activated opening change material being combined in another embodiment of the present application;

[0090] Fig.34 for Fig.33 When the middle opening is opened, it presents a schematic diagram with the top larger and the bottom smaller;

[0091] Fig.35 This is a schematic diagram of a hygroscopic shrinkage material in one embodiment of the present application being disposed on a certain side of a sheet material, first plasticized and bonded, and then processed into an opening;

[0092] Fig.36 This is a schematic diagram of a process in which a hygroscopic shrinkage material is disposed on a certain side of a sheet material in an embodiment of the present application, an opening is first processed and then plasticized and bonded;

[0093] Fig.37 This is a schematic diagram of when the hygroscopic shrinkage material is disposed on a certain side of the sheet material in one embodiment of the present application, and the processing opening and plasticization bonding are completed simultaneously;

[0094] Fig.38 This is a schematic diagram of an embodiment of the present application in which the number of yarns on both sides of the opening is different;

[0095] Fig.39 for Fig.38 Schematic diagram of the middle opening after opening;

[0096] Fig.40 This is a schematic diagram of a hygroscopic shrinkage material and a sheet material after plastic bonding in one embodiment of the present application;

[0097] Fig.41 This is a schematic diagram of a hygroscopic shrinkage material being disposed on both the upper and lower surfaces of a sheet in one embodiment of the present application;

[0098] Fig.42 This is a schematic diagram of a hygroscopic shrinkage material disposed inside a sheet in one embodiment of the present application;

[0099] Fig.43 This is a schematic diagram comparing the plasticized part and the non-plasticized part of the hygroscopic shrinkage material after absorbing moisture in one embodiment of the present application;

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

[0101] Fig.45 for Fig.44 Schematic diagram of the middle opening after opening;

[0102] Fig.46 This is a schematic diagram of a hygroscopic shrinkage material in one embodiment of the present application being disposed in a sheet material, first plasticized and bonded, and then processed to open;

[0103] Fig.47 This is a schematic diagram of an embodiment of the present application in which a hygroscopic shrinkage material is disposed in a sheet material, and an opening is first processed and then plasticized and bonded;

[0104] Fig.48 This is a schematic diagram of an embodiment of the present application in which a hygroscopic shrinkage material is disposed in a sheet material, and processing of an opening and plasticization and bonding are completed simultaneously;

[0105] Fig.49 This is a schematic diagram of an embodiment of the present application in which the hygroscopic shrinkage material is simultaneously disposed on the upper and lower surfaces of the sheet material, and is first plasticized and bonded and then processed into an opening;

[0106] Fig.50 This is a schematic diagram of an embodiment of the present application in which the hygroscopic shrinkage material is simultaneously disposed on the upper and lower surfaces of the sheet material, and the opening is first processed and then plasticized and bonded;

[0107] Fig.51 This is a schematic diagram of an embodiment of the present application in which the hygroscopic shrinkage material is simultaneously disposed on the upper and lower surfaces of the sheet, and the processing of the opening and the plasticizing and bonding are completed simultaneously.

[0108] Explanation of the symbols in the schematic diagram:

[0109] Sheet 101;

[0110] Plasticized bonding point 102;

[0111] Drum 103;

[0112] inner layer 104;

[0113] Through hole 105;

[0114] Hygroscopic shrinkage material 201;

[0115] Non-free end 201-1;

[0116] Free end 201-2;

[0117] Opening 202;

[0118] Adhesive mechanism 301;

[0119] Opening mechanism 302. DETAILED DESCRIPTION

[0120] 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.

[0121] 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.

[0122] In one embodiment, the present application provides a moisture-activated opening change material, such as Figure 5-34 , 38-45, including a sheet 101, and a hygroscopic shrinkage material 201 is arranged on the surface and / or inside of the sheet 101, that is, the hygroscopic shrinkage material 201 can be arranged on the upper surface or the lower surface of the sheet 101. The hygroscopic shrinkage material 201 can also pass through the sheet 101, and be arranged on both the upper surface and the lower surface of the sheet. When the thickness of the sheet 101 is greater than the thickness of the hygroscopic shrinkage material 201, for example, the thickness of the sheet is 0.01mm-5mm, the hygroscopic shrinkage material 201 can also be arranged inside the sheet 101.

[0123] The sheet 101 also includes a hygroscopic shrinkage material 201, only part of which is fixed to the sheet 101 via the plasticized bonding point 102, while in the non-plasticized bonding area, the sheet 101 and the hygroscopic shrinkage material 201 are independent of each other. In the drawings of the present application, for easy identification, in the material composed of the sheet 101 and the hygroscopic shrinkage material 201, the material thickness at the plasticized bonding point 102 is significantly smaller than that in the adjacent area.

[0124] The plasticized bonding point 102 is provided with an opening 202 , and the opening 202 penetrates the plasticized bonding point 102 and the hygroscopic shrinkage material 201 at the plasticized bonding point 102 .

[0125] The area outside the plasticized bonding point 102 is a non-plasticized bonding area, and the remaining hygroscopic shrinkage material 201 and the sheet material 101 are independent of each other in the non-plasticized bonding area. When wet, the hygroscopic shrinkage material 201 in the plasticized bonding area does not shrink, and the hygroscopic shrinkage material 201 in the non-plasticized bonding area shrinks after being wet, pulling the hygroscopic shrinkage material 201 in the plasticized bonding area to drive the opening 202 to expand, thereby facilitating solids and viscous substances to pass through the sheet material 101 through the opening 202.

[0126] When the sheet 101 partially melts and penetrates into the treated part of the hygroscopic shrinkage material 201, and is fixed to form the plasticized bonding point 102, the hygroscopic performance of this part of the hygroscopic shrinkage material 201 will decrease or even disappear, and no further expansion and contraction will occur. Since the end of the hygroscopic shrinkage material loses its hygroscopic expansion and contraction properties, it will not expand infinitely and will not be unable to be fixed. Therefore, even when the product contacts a large amount of liquid, the end of the hygroscopic shrinkage material will not lose its fixation or relative displacement, and the opening will not close due to the loss of the traction effect.

[0127] The plasticized bonding point 102 refers to a film-like area formed by melting the sheet 101 and the hygroscopic shrinkage material 201 by one or more methods including high temperature, high pressure, ultrasonic wave, and laser, and the sheet 101 and the hygroscopic shrinkage material 201 are mutually infiltrated, cooled, plasticized, and fixed. The density of the plasticized bonding point 102 is higher than that of the non-plasticized bonding area. The softness, thickness, and liquid permeability of the plasticized bonding point 102 are lower than those of the non-plasticized bonding area. Since the effect of the plasticized bonding point formed by ultrasonic treatment is better than that formed by high temperature and high pressure treatment, it is preferred to form the plasticized bonding point by ultrasonic treatment.

[0128] The hygroscopic shrinkage material 201 has an end at or near the opening 202. The projection of the end on the sheet 101 is located within the projection area of ​​the plasticized bonding point 102 on the sheet 101. The end is a non-free end 201-1, where the non-free end 201-1 means that the end is plasticized and bonded to the sheet 101. The non-free end 201-1 of the hygroscopic shrinkage material 201 can be flush with the edge of the opening 202, such as Fig. 9The non-free end 201-1 of the hygroscopic shrinkage material 201 may be spaced apart from the edge of the opening 202, as shown in FIG. Figure 7 shown.

[0129] Regarding the location of the hygroscopic shrinkage material 201, the hygroscopic shrinkage material 201 can be placed on the upper surface or the lower surface of the sheet 101. The hygroscopic shrinkage material 201 can also pass through the sheet 101 and be placed on both the upper surface and the lower surface of the sheet. The thickness of the sheet 101 can also be greater than that of the hygroscopic shrinkage material 201, and the hygroscopic shrinkage material 201 can be placed inside the sheet 101.

[0130] As for the hygroscopic shrinkage material 201, as an optional embodiment, the hygroscopic shrinkage material 201 is a hygroscopic shrinkage yarn made of PVA fiber, or one or more of a hygroscopic shrinkage strip or a hygroscopic shrinkage cloth made by spinning PVA resin through a spinneret and hot rolling.

[0131] Hygroscopic expansion and shrinkage PVA (polyvinyl alcohol) is a hydrophilic polymer. Its hygroscopicity mainly comes from 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, and the lower the hygroscopicity.

[0132] When PVA (polyvinyl alcohol) absorbs moisture, water molecules will first diffuse into the molecular chains of the outer layer of PVA, causing the molecular chains of PVA to expand, which will appear as expansion and shrinkage in the middle. The higher the degree of polymerization and alcoholysis, the smaller the space for the molecular chains to move, the more difficult it is for water molecules to diffuse, and the higher the energy required for the molecular chains to expand, which is why PVA is divided into low-temperature, medium-temperature, and high-temperature types.

[0133] The melting point of hygroscopic expansion and contraction PVA (polyvinyl alcohol) is 224-239°C, but it will lose its hygroscopic expansion and contraction properties by dehydration and cross-linking at 160-170°C. Through local high heat and / or high pressure, laser treatment or cross-linking treatment, the hydroxyl group (-OH) can be reduced by 80%-99%, which can reduce the hygroscopicity of the material and even turn it into a non-hygroscopic material.

[0134] The hygroscopic expansion and shrinkage yarn is made of short fibers made of hygroscopic expansion and shrinkage PVA through ring spinning. Its structural characteristics are basically tight inside and loose outside. Half of the fibers are conical spirals, and a small part of the fibers do not transfer inside and outside and are cylindrical spirals. When the hygroscopic expansion and shrinkage yarn contacts water, the fiber moisture expansion will reduce the gap between the fibers, and the yarn will shrink and gather in the middle as a whole. At the same time, the yarn will unwind during the expansion process and further shrink, and has a certain shrinkage force.

[0135] The hygroscopic shrinkage material can be a shrinkage line or shrinkage cloth made of hygroscopic expansion yarn and spandex, or a shrinkage strip or shrinkage cloth made of hygroscopic expansion and shrinkage PVA staple fibers. When the hygroscopic shrinkage material is yarn, the shrinkage line can be a single line made of single or multiple strands of spiral winding, or multiple lines arranged in parallel or winding; the hygroscopic shrinkage material can also be a strip or block of cloth.

[0136] The opening 202 penetrating the plasticized bonding point 102 means that the opening 202 penetrates from one side of the sheet 101 to the other side. When the opening 202 is pulled and expanded by the hygroscopic shrinkage material 201, solids and viscous substances will pass through the sheet 101 through the opening 202. It should be noted that the opening 202 may be in the form of a slit or a hole with an inner diameter or a combination of the two. When the opening 202 is in the form of a slit, the side walls on both sides of the slit may be in contact with each other. When subjected to traction, the side walls on both sides will separate to form a through hole.

[0137] The sheet material 101 may be one or more of fiber products, paper products, and film materials. The fiber products may be non-woven fabrics, elastic fabrics, shrink fabrics, and fabrics. The weight of the sheet material 101 is 0.1 to 500 g / m 2 , thickness is 0.001~50mm.

[0138] The specific test method for gram weight is to use electronic balance (accurate to 0.01g), LD-102 force sampler, paper cutter and other measuring devices and instruments, use the force sampler to cut a non-woven fabric with an area of ​​0.01 square meters, if the material width is less than 120mm, use the paper cutter to cut a 1m sample, area = actual width (m) * 1 square meter. Use an electronic balance to weigh the mass G of each sample, and convert the gram weight from the sample area, gram weight = G / sample area. It should be noted that the average value of at least 9 test points of the material needs to be taken as the gram weight. The reference standards for gram weight test are "FZ / T 64046 2014 Hot air nonwoven fabrics" and "GB / T 24218.1-2009 Textile nonwoven fabric test methods Part 1: Determination of mass per unit area".

[0139] The specific thickness test method is to use the YG141D digital fabric thickness meter and set the test area to 2500mm 2, the test pressure is the pressure applied by a 100g weight. A paper cutter is also used. Take a 1m test sample with uniform texture, start the thickness gauge, bring the pressure plate to the bottom of the plate, and confirm that the value is 0. Lift the presser foot, place the sample on the reference plate without tension, lower the presser foot until it touches the sample, measure for 10S, and the reading displayed on the instrument 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 nonwoven fabrics" and "GB / T 24218.2-2009 Textile nonwoven fabric test methods Part 2: Determination of thickness".

[0140] As for the shape of the plasticized bonding point 102, as an optional embodiment, the surface of the plasticized bonding point 102 is roughly flat or "concave" or "convex". When the surface of the plasticized bonding point 102 is roughly "concave" or "convex", the concave depth or convex height is 0.01-100 mm.

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

[0142] When the hygroscopic shrinkage material 201 is a hygroscopic shrinkage strip or a hygroscopic shrinkage cloth, the thickness of the hygroscopic shrinkage strip or the hygroscopic shrinkage cloth is 0.1 to 5 mm, and the gram weight is 0.01 to 500 g / m 2 The thickness and weight test methods here can refer to the above test methods.

[0143] When the hygroscopic shrinkage material 201 is hygroscopic shrinkage yarn, the yarns on both sides of the opening 202 have the same or different thicknesses, and / or the same or different numbers, and / or are parallel or form an angle along the length extension direction.

[0144] As an optional technical solution, the length of the hygroscopic shrinkage material 201 fixed to the sheet 101 at the plasticized bonding point 102 is L1, and the length of the hygroscopic shrinkage material 201 in the non-plasticized bonding area is L2, wherein L1:L2=(10:1)~(1:10). Fig.26 The fixed length between the hygroscopic shrinkage material 201 and the sheet material 101 at the plasticized bonding point 102 is the fixed length L1, and the length of the hygroscopic shrinkage material 201 in the non-plasticized bonding area is the traction length L2.

[0145] The shape of the opening 202 may be one or more of 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 circular holes connected at both ends of a slit, which will not be elaborated or limited here.

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

[0147] For different shapes of the plasticized bonding point 102, different arrangements of the hygroscopic shrinkage material 201 and different shapes of the opening 202, please refer to Figure 5-24 , 27-34, 38-45 show various embodiments and schematic diagrams of the openings in each embodiment.

[0148] As an optional implementation scheme, the hygroscopic shrinkage material 201 can simultaneously select two groups of yarns of different specifications. When the moisture absorption of one group reaches a certain value, it fails and closes. Then, when the moisture absorption of the second group of materials on the product reaches a higher value, it begins to absorb moisture and shrink and open. For example, L01 and T01 hygroscopic shrinkage materials are arranged side by side on the plasticized bonding points of the sheet and processed with openings. They are attached to the core body, and 20g of water-repellent PE film is placed under the core body. Within 10 seconds, 80ml of normal saline is continuously added. The L01 hygroscopic shrinkage material will shrink due to moisture absorption, and will first be pulled open and then fail and close. The T01 hygroscopic shrinkage material remains unchanged. Within the second 10 seconds, 80ml of normal saline is continuously added. The T01 hygroscopic shrinkage material will shrink due to moisture absorption and then close after being pulled open.

[0149] There are different specifications for hygroscopic shrinkage yarns, see Table 1 below for details:

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

[0151] Table 1 Numbers of yarns with different specifications for moisture absorption and shrinkage

[0152] Among them, S is the imperial count, which refers to the number of 840 yards of yarn weighing one pound at the standard moisture regain. Generally, the yarn count of short fibers is represented by S, and short fibers are expressed in English as Staple. The thicker the yarn, the smaller the S value; the thinner the yarn, the larger the S value. For example, 40S is thinner than 20S, and 20S / 2 means two 20S yarns are twisted together.

[0153] Nm metric count refers to the multiple of the length of 1 gram of yarn at the standard moisture regain. That is to say, 1 gram of yarn is exactly one meter long, which is 1 (metric) count. 1 gram of yarn is 200 meters long, and the fineness of the yarn is 200. Metric count is also fixed, so the larger the count, the finer the yarn.

[0154] D is the abbreviation of Denier, which is a method of expressing the fineness of chemical fibers. It refers to the weight of 9,000 meters of silk at the standard moisture regain. Generally, the count of filament is represented by D, and filament is expressed in English as Filament. The larger the D, the thicker the yarn, for example, 75D is thicker than 50D.

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

[0156] The moisture absorption response temperature of yarns of various specifications was detected, and the data in Table 2 were obtained:

[0157] 10mm free line segment Hygroscopic response temperature / ℃ 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 finally begins to shrink. Within certain conditions, the shrinkage force can still be maintained.

[0160] As an optional technical solution, the hygroscopic response time of the hygroscopic shrinkage material 201 is 0 to 20 seconds. The hygroscopic response time refers to the time from the immersion of a 10 mm length of hygroscopic shrinkage material to the beginning of the change of the yarn when the 10 mm length of the hygroscopic shrinkage material is immersed in 10 ml of liquid.

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

[0162] The test method for the yarn moisture absorption shrinkage rate is as follows: take 10mm yarn and place it in a constant temperature oven (temperature is 37°C), add 10ml of 37°C physiological saline to immerse the yarn, observe the recorder's moisture absorption response time, shrinkage time, and the final length after shrinkage, test the shrinkage rate of yarns of various specifications, and obtain the data in Table 3:

[0163]

[0164] Table 3 Shrinkage of yarns of various specifications

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

[0166] In addition, at an ambient temperature of 25°C, using physiological saline as the test liquid, the state changes of the amount of liquid contact of different hygroscopic shrinkage materials were detected, and the data in Table 4 were obtained:

[0167]

[0168] Table 4 Changes in the state of contact with liquid of hygroscopic shrinkage materials of different specifications

[0169] If L01 hygroscopic shrinkage material is arranged on the plasticized bonding point of the sheet and an opening is provided, it is attached to the core, 20g of water-repellent PE film is placed under the core, and 80ml of normal saline is continuously added within 10s, the L01 hygroscopic shrinkage material pulls the opening to make it open, and then fails to close.

[0170] In this application, a method for processing a moisture-activated opening change material is proposed, which is as follows:

[0171] like Fig.35 As shown, the hygroscopic shrinkage material 201 is stacked with the sheet material 101; the sheet material 101 and the hygroscopic shrinkage material 201 are bonded by a bonding mechanism 301 to form a plasticized bonding point 102; and an opening 202 is processed on the plasticized bonding point 102 by an opening mechanism 302.

[0172] Or Fig.36 As shown, the hygroscopic shrinkage material 201 is stacked with the sheet 101; an opening 202 is processed on the sheet 101 and the hygroscopic shrinkage material 201 by an opening mechanism 302; the sheet 101 and the hygroscopic shrinkage material 201 are bonded by a bonding mechanism 301 to form a plasticized bonding point 102.

[0173] Or Fig.37 The shrink material 201 is stacked with the sheet 101; an opening 202 is processed on the sheet 101 and the hygroscopic shrink material 201 through an opening mechanism 302, and the sheet 101 and the hygroscopic shrink material 201 are bonded together by a bonding mechanism 301 to form a plasticized bonding point 102.

[0174] Or Fig.46 As shown, the hygroscopic shrinkage material 201 is placed inside the sheet 101, and the sheet 101 and the hygroscopic shrinkage material 201 are first fixed by the bonding mechanism 301 to form a plasticized bonding point 102; and then an opening 202 is processed on the plasticized bonding point 102 by the opening mechanism 302;

[0175] Or Fig.47 As shown, the hygroscopic shrinkage material 201 is placed inside the sheet 101, and the opening 202 is first processed on the sheet and the hygroscopic shrinkage material by the opening mechanism 302, and then the sheet 101 and the hygroscopic shrinkage material 201 are fixed by the bonding mechanism 301 to form a plasticized bonding point 102;

[0176] Or Fig.48As shown, the hygroscopic shrinkage material 201 is placed inside the sheet 101, and the sheet 101 and the hygroscopic shrinkage material 201 are fixed by the bonding mechanism 301 to form a plasticized bonding point 102; and the opening 202 is processed on the plasticized bonding point 102 by the opening mechanism 302 at the same time;

[0177] Or Fig.49 As shown, the hygroscopic shrinkage material 201 is interlaced on the upper and lower surfaces of the sheet 101, and the sheet 101 and the hygroscopic shrinkage material 201 are first fixed by the bonding mechanism 301 to form a plasticized bonding point 102; and then the opening 202 is processed on the plasticized bonding point 102 by the opening mechanism 302;

[0178] Or Fig.50 As shown, the hygroscopic shrinkage material 201 is interlaced on the upper and lower surfaces of the sheet 101, and the opening 202 is first processed on the sheet and the hygroscopic shrinkage material by the opening mechanism 302, and then the sheet 101 and the hygroscopic shrinkage material 201 are fixed by the bonding mechanism 301 to form a plasticized bonding point 102;

[0179] Or Fig.51 As shown, the hygroscopic shrinkage material 201 is interlaced between the upper and lower surfaces of the sheet 101, and the sheet 101 and the hygroscopic shrinkage material 201 are fixed by a bonding mechanism 301 to form a plasticized bonding point 102; and the opening 202 is processed on the plasticized bonding point 102 simultaneously by an opening mechanism 302.

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

[0181] The present application also provides a sanitary product, which contains the above-mentioned wet-activated opening-changing material. The sanitary product may contain the above-mentioned wet-activated opening-changing material in one or more of its components such as the surface layer, core body, waist circumference, three-dimensional guard, waist patch, etc. Of course, it is not limited to these components, and the above-mentioned wet-activated opening-changing material can also be used in other components of the sanitary product, which is not limited here.

[0182] The following are several groups of experiments to verify the performance of the moisture-absorbing opening material of this application:

[0183] Embodiment 1

[0184] Take a single yarn, and its end is flush with the opening. The sheet material is hot air non-woven fabric, which is a plain non-woven fabric containing 0.8D two-component staple fibers, with a gram weight of 20g. The hygroscopic shrinkage material is D01 yarn, which adopts a single wiring method. The hygroscopic shrinkage liquid is physiological saline at a temperature of 37°C. The plasticized bonding point is a square with a size of 3mm*3mm, a longitudinal spacing of 12mm, and a lateral spacing of 6mm. The hair surface of the hot air non-woven fabric and the hygroscopic shrinkage line are bonded in the center of the plasticized bonding point. The opening is in the center of the plasticized bonding point. The surface layer and the hygroscopic shrinkage material are cut through together. The opening is a "one" slit with a length of 3mm and a width of 0.01mm. One side of the hair surface of the hot air non-woven fabric is in contact with the core. 37°C physiological saline was used to test the penetration and back penetration of the surface layer. Under the shrinkage tension of the hygroscopic shrinkage yarn, the width of the opening 202 changes from 0.01mm to 3mm, and the area of ​​the opening 202 changes from 0.03mm 2 Change to 2.25mm 2 , the opening 202 is as follows Figure 5 and Figure 6 shown.

[0185] As control example 1-1, the other conditions are the same as above, except that no opening is provided. Test data of three penetrations of the test material and the amount of material back permeation.

[0186] The three-pass test method is:

[0187] 1. Measurement devices 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 sample of 125*125 mm and prepare it with 0.9% physiological saline for later use;

[0194] (2) Pour 25 mL of normal saline into the funnel, adjust the opening and closing degree of the tip valve, start the solenoid valve, and use a stopwatch to control the liquid flow rate to 25 mL within (3.5 ± 0.25) s;

[0195] (3) Prepare 10 pieces of filter paper (FP / 4"X4" absorbent paper, glossy side up) and stack them together as standard absorbent pads. Place them flat on the base plate. Place the sample directly on top of the filter paper (with the surface to be used facing up). Then press the penetration disk directly on top of the sample. The center of the funnel, the center of the penetration disk, and the center of the sample overlap. The tip of the funnel is located (45±1) mm above the base plate of the instrument.

[0196] (4) Return the timer to zero. At 0 min, add 5 ml of test solution to the funnel using a pipette. Open the drain valve. After the liquid has completely penetrated the filter paper, read the first liquid penetration time with an accuracy of 0.1 s.

[0197] (5) Return the timer to zero. After 1 minute, add 5 ml of test solution to the funnel with a pipette without changing the filter paper. Open the drain valve. After the liquid has completely penetrated the filter paper, read the second liquid penetration time with an accuracy of 0.1 s.

[0198] (6) Return the timer to zero. After 2 minutes, add 5 ml of test solution to the funnel using a pipette without replacing the filter paper. Open the drain valve. After the liquid has completely penetrated the filter paper, read the third liquid penetration time with an accuracy of 0.1 s.

[0199] 3. Reference standards

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

[0201] GB / T 24218.13-2010 Textiles - Test methods for nonwoven fabrics - Part 13: Determination of multiple penetration time of liquids

[0202] The material re-seepage test method is:

[0203] 1. Measurement devices and instruments

[0204] (1) YG814D Liquid Penetration Tester

[0205] (2) Paper cutter

[0206] (3) Standard absorbent pad (filter paper)

[0207] (4) Stopwatch

[0208] (5) Electronic balance (accurate to 0.01g)

[0209] 2. Procedure

[0210] (1) Cut a sample of 125*125 mm and prepare it with 0.9% saline solution for later use;

[0211] (2) Pour 25 mL of normal saline into the funnel, adjust the opening and closing degree of the tip valve, start the solenoid valve, and use a stopwatch to control the liquid flow rate to 25 mL within (3.5 ± 0.25) s;

[0212] (3) Prepare 10 pieces of filter paper (FP / 4"X4" absorbent paper, glossy side up) and stack them together as standard absorbent pads. Place them flat on the base plate. Place the sample directly on top of the filter paper (with the surface to be used facing up). Then press the penetration disk directly on top of the sample. The center of the funnel, the center of the penetration disk, and the center of the sample overlap. The tip of the funnel is located (45±1) mm above the base plate of the instrument.

[0213] (4) Return the timer to zero. At 0 min, add 5 ml of test solution to the funnel using a pipette and open the drain valve.

[0214] (5) Return the timer to zero. After 1 minute, add 5 ml of test solution to the funnel using a pipette without changing the filter paper, and open the drain valve.

[0215] (6) Return the timer to zero. After 2 minutes, add 5 ml of test solution to the funnel using a pipette without changing the filter paper, and open the drain valve.

[0216] (7) Remove the sample and filter paper from the penetration device and gently place a 4 kg standard pressure block on the sample within 5 seconds. Start timing when the pressure is completely applied.

[0217] (8) After leaving it for 3 minutes, carefully remove the pressed block within 5 seconds and wipe it dry;

[0218] (9) Weigh 2 layers of filter paper (FP / 4"X4" absorbent paper, glossy side down), record the mass (m1) and place it on the sample to the nearest 0.001 g;

[0219] (10) Gently place the 4 kg standard block back on the filter paper within 5 seconds. After 2 minutes, carefully remove the block within 5 seconds and reweigh the mass of the two layers of filter paper. Record the mass (m2) to the nearest 0.001 g.

[0220] (11) Sample back permeation volume = m2-m1

[0221] 3. Reference standards

[0222] GBT24218.14-2010 Textiles - Test methods for nonwoven fabrics - Part 14: Determination of moisture repellency of covering materials

[0223] According to the above method, the three penetration and surface layer re-seepage test data of the material were tested, and the data in Table 5 were obtained:

[0224]

[0225] Table 5 Three penetration and surface layer back-seepage test data of materials

[0226] It can be seen from the data in the table that, compared with the control example, the second penetration time of the product of Example 1 of the present application is reduced by 61%, the third penetration time is reduced by 35%, and the re-seepage amount is also significantly reduced.

[0227] Embodiment 2

[0228] The sheet is a spunbond nonwoven fabric with a gram weight of 20g and is processed with an opening. The hygroscopic shrinkage material is D01 yarn, which is wired in a single-strand manner. The hygroscopic shrinkage liquid temperature is 37°C. The size of the plasticized bonding point is 3mm*3mm, the longitudinal spacing is 12mm, and the lateral spacing is 6mm. The sheet and the hygroscopic shrinkage material are bonded at the plasticized bonding point. The yarns on both sides of the opening are of different numbers, such as Fig.38 , 1 on the left and 2 on the right. Cut the sheet and the hygroscopic shrinkage yarn together at the center of the plasticized bonding point to form an opening. The side of the non-woven fabric with the hygroscopic shrinkage material is in contact with the core. After being soaked in urine, under the shrinkage tension of the hygroscopic shrinkage yarn, the width of the opening on the left is 1mm, and the width of the opening on the right is 2mm. The opening area is 2mm 2 Change to 4mm 2 The opening is changed into opening 202, which facilitates menstrual blood, loose stools and other viscous excrement to quickly and smoothly pass from the upper surface layer to the lower surface layer. Fig.39 shown.

[0229] Embodiment 3

[0230] The sheet material is hot air cloth. As a preferred method, one side containing 0.8D fiber is used as the use side of plain non-woven fabric, with a gram weight of 20g, and the back side uses plain hot air cloth containing 1.2D fiber, with a gram weight of 20g. The hygroscopic shrinkage material is D02 yarn, and a single-strand wiring method is adopted. The hygroscopic shrinkage liquid is physiological saline, and the temperature is 37°C. The size of the plasticized bonding point is 3mm*3mm, the longitudinal spacing is 6mm, and the lateral spacing is 6mm. The sheet material and the hygroscopic shrinkage yarn are bonded at the plasticized bonding point, and the opening is in the center of the plasticized bonding point to cut off the sheet material and the hygroscopic shrinkage line together, such as Fig. 9 As shown. The opening is rectangular, 3mm long and 1mm wide. The back side of the non-woven fabric is in contact with the core, and the non-woven fabric is sprayed with glue to replace and stick to the product. The national standard absorption speed and re-seepage amount are tested, and the surface layer thickness before and after the test is measured.

[0231] As control example 3-1, the other conditions are the same as above, except that no opening is provided. As control example 3-2, the other conditions are the same as above, except that no hygroscopic shrinkage material is provided. The products of control examples 3-1 and 3-2 are sprayed and bonded to the core body, and the national standard absorption speed and rewet amount are tested, and the surface layer thickness before and after the test is measured.

[0232] Diaper national standard back permeability test method

[0233] 1. Measuring instruments and devices

[0234] Diaper national standard absorption speed tester T025A

[0235] 2. Procedure

[0236] 1) Calibrate various instrument parameters

[0237] 2) Weigh the absorbent filter paper

[0238] 3) Install the product on the base

[0239] 4) Place the base on the test instrument and install the liquid adding module

[0240] 5) Select test specifications

[0241] 6) Test startup

[0242] 7) Replace the pressurization module according to the prompts

[0243] 8) Weigh the weight of the filter paper after pressurization

[0244] 3. Reference standards

[0245] GBT 28004.1—2021 Diapers Part 1: Baby Diapers

[0246] The test data is shown in Table 6:

[0247] Absorption per time / s Secondary absorption / s Re-seepage amount / g Thickness before test / mm Thickness after test Comparative Example 3-1 21 65 12.2 1.44 1.29 Comparative Example 3-2 19 58 12.1 1.43 1.24 Example 3 15 53 5 1.46 1.64

[0248] Table 6 Comparison of national standard test performance

[0249] From the above table, it can be seen that compared with Example 3-1, the absorption speed of Example 3 increased by 18-28%, the re-seepage amount decreased by 59%, and the three-dimensional height of the flower pattern increased by 12.3%. Compared with Example 3-2 and Example 3-1, the absorption speed, re-seepage amount, and flower pattern height before and after the test were almost unchanged. Compared with Example 3-2, the absorption speed of the embodiment increased by 8-22%, the re-seepage amount decreased by 59%, and the three-dimensional height of the flower pattern increased by 13%.

[0250] Embodiment 4

[0251] The sheet material is hot air cloth, using 0.8D plain non-woven fabric with a gram weight of 20g, the inner layer is 1.2D plain hot air cloth with a gram weight of 20g, and the plane layer is on the side of the inner layer, using 2D plain non-woven fabric with a gram weight of 16g. The hygroscopic shrinkage material is S01 yarn, using a single wiring method, and the hygroscopic shrinkage liquid temperature is 37°C. The size of the plasticized bonding point is 3mm*3mm, the longitudinal spacing is 6mm, and the transverse spacing is 6mm. The sheet, hygroscopic shrinkage line and inner layer are bonded at the plasticized bonding point. The surface layer and the hygroscopic shrinkage line are cut together at the center of the plasticized bonding point. The opening is a slit, and the opening direction is consistent with the transverse direction of the non-woven fabric. The length is 2mm and the width is 0.1mm. The plane layer and the D01 yarn are bonded at the plasticized bonding point. The plane layer and the yarn are cut together at the center of the plasticized bonding point. The opening is H-shaped in the use direction of the non-woven fabric, and the opening is like Fig.16 The length of the vertical and horizontal openings is 3mm.

[0252] The inner layer side of the embossed double layer is bonded to the flat layer, and then the flat layer side is brought into contact with the core body.

[0253] After 80 ml of 37°C artificial urine was added, the opening of the embossed double layer was pulled from 0.1 mm to 1 mm, and the opening area was increased from 0.1 mm 2 , open to 0.25mm 2 When the yarn loses its function and closes, the plane layer opening width is increased from 0.1mm to 4mm, and the opening area is increased from 0.1mm 2 , becomes 10mm 2 ,like Fig.13 , the overall opening is Fig.14 It is also feasible to flip the surface layer, material, and opening, or use the same opening and use different specifications of hygroscopic shrinkage materials for the upper and lower layers. The upper layer opening at the plasticized bonding point is opened after receiving excrement to guide the excrement under the surface layer and then closed, which improves the dryness of the surface layer and reduces the back seepage of excrement.

[0254] Embodiment 5

[0255] The sheet material is hot air cloth, 0.8D plain non-woven fabric, gram weight 20g. The hygroscopic shrinkage material is Y01 and L01 yarn, and the parallel wiring method is adopted. The hygroscopic shrinkage liquid temperature is 37℃. The size of the plasticized bonding point is 3mm*3mm, the longitudinal spacing is 12mm, and the lateral spacing is 6mm. The sheet and the hygroscopic shrinkage line are bonded at the plasticized bonding point. The sheet and the hygroscopic shrinkage line are cut together at the center of the plasticized bonding point. The opening is a slit with a length of 4mm and a width of 0.1mm. The wool side of the non-woven fabric is in contact with the core. When 80ml of saline is poured in for the first time, Y01 shrinks and pulls the opening, and the maximum width is 4mm. After the liquid is absorbed, the Y01 yarn loses the traction effect and the opening is closed. At this time, the L01 yarn has not started to shrink. The second time 80ml of saline is poured, L01 shrinks and pulls the opening, and it is maintained before the third liquid addition. The third time 80ml of saline is added, the L01 yarn loses the traction effect after absorption, and the opening is closed. The opening and closing twice can effectively solve the problem of multiple uses and multiple drying of the surface layer, and realize multiple operations in multiple defecation scenarios.

[0256] Embodiment 6

[0257] The sheet material is selected as hot air cloth, and the hygroscopic shrinkage yarn is D01 with a diameter of 0.17mm. The size of the plasticized bonding point is 5mm*5mm, and the spacing between the bonding points is 15mm. The sheet material and the hygroscopic shrinkage yarn are bonded at the plasticized bonding point. The thickness of the hot air cloth and the yarn at the plasticized bonding point, and the width of the yarn before and after the liquid is added are measured as shown in Table 7. The surface layer is placed on a 20g PE film, and 10ml of physiological saline is added to make the hygroscopic shrinkage yarn between at least 3 plasticized bonding points completely infiltrated. The thickness at the plasticized bonding point after complete shrinkage, the yarn width, and the yarn diameter and length of the free section are tested.

[0258]

[0259] Table 7 Dimensional changes of yarn plasticized bonding points and non-plasticized bonding points

[0260] It can be seen that the thickness and length of the yarn at the plasticized bonding point did not change before and after moisture absorption. The yarn in the non-bonded area shrank by 60% and expanded by 3.8 times after moisture absorption. That is, the yarn in the bonding area has almost no moisture expansion and contraction due to the plasticization treatment.

[0261] Embodiment 7

[0262] The sheet material is spunbonded nonwoven fabric with a gram weight of 20g. The hygroscopic shrinkage material is D01 yarn, using a single wiring method, and the hygroscopic shrinkage liquid temperature is 37°C. The plasticized bonding points are adjacent bonding points with a size of 2*3mm and a spacing of 2mm. The processing method used is to complete the plasticized bonding and opening simultaneously. The bonding and opening mechanisms are "concave" type. The bonding parts on both sides are 1mm*3mm each, and an opening mechanism is provided at the bottom edge of the "concave" with a spacing of 2mm. Fig.37 As shown. The longitudinal spacing of the bonding area is 12mm, and the transverse spacing is 6mm. The sheet and the hygroscopic shrinkage yarn are opened at the same time as plasticizing and bonding, and there is no free end of the thread exposed at the opening. Compared with the two-step method of plasticizing and bonding first and then slitting or slitting first and then plasticizing and bonding, the one-step method of plasticizing and bonding and opening at the same time is simpler in process and uses less equipment.

[0263] Embodiment 8

[0264] The sheet material is spunbonded nonwoven fabric with a gram weight of 20g. The hygroscopic shrinkage material is D01 yarn, which is a single yarn that crosses the sheet material up and down and is set on the upper and lower surfaces of the sheet material. The processing method of opening first and then plasticizing and bonding is adopted. The size of the plasticizing bonding point is 3mm*3mm, the longitudinal spacing is 12mm, and the lateral spacing is 6mm. The sheet material and the hygroscopic shrinkage material are bonded at the plasticizing bonding point, such as Fig.41 As shown. At the center of the plasticized bonding point, the sheet and the hygroscopic shrinkage material are cut together to form an opening, which is a slit with a width of 0.01mm. The side of the non-woven fabric provided with the hygroscopic shrinkage material is in contact with the core, and a 20g PE bottom film is set under the core. 37°C physiological saline is used as simulated urine, and 80ml of liquid is added for testing. Under the shrinkage tension of the hygroscopic shrinkage yarn, the opening width changes from 0.01mm to 2.5mm.

[0265] Embodiment 9

[0266] The sheet is hot air non-woven fabric, with a gram weight of 20g. The hygroscopic shrinkage material is D02 yarn, which is laid inside the thick sheet using two wires. The processing method of plasticizing and bonding first and then opening is adopted. The size of the plasticizing bonding point is 3mm*3mm, the longitudinal spacing is 12mm, and the lateral spacing is 6mm. The sheet and the hygroscopic shrinkage material are bonded at the plasticizing bonding point. Fig.42 As shown. At the center of the plasticized bonding point, the sheet and the hygroscopic shrinkage material are cut together to form an opening, which is a slit with a width of 0.01mm. The side of the non-woven fabric provided with the hygroscopic shrinkage material is in contact with the core, and a 20g PE bottom film is set under the core. 37°C physiological saline is used as simulated urine, and 80ml of liquid is added for testing. Under the shrinkage tension of the hygroscopic shrinkage yarn, the opening width changes from 0.01mm to 2.5mm.

[0267] Embodiment 10

[0268] A diaper, composed of a hydrophilic surface layer, an absorbent core, and a water-repellent bottom film, the core adopts a 500g prefabricated core, the water-repellent bottom film is a 20g PE film, the hydrophilic surface layer adopts a hot air non-woven fabric, the weight is 20g, the hygroscopic shrinkage material is D02 yarn, a single wire is used and laid on one side of the sheet. The processing method of plasticizing and bonding first and then opening is adopted, the plasticizing and bonding point is a complete plane, the size is 3mm*3mm, the longitudinal spacing is 12mm, and the lateral spacing is 6mm. The sheet and the hygroscopic shrinkage material are bonded at the plasticizing and bonding point, and the sheet and the hygroscopic shrinkage material are cut together to form an opening, the opening is a slit, and the width is 0.01mm.

[0269] The hygroscopic shrinkage material on both sides of the opening has no free ends, e.g. Figure 5 shown.

[0270] As control example 10-1, the same arrangement as above is adopted, except that the plasticized bonding points are two adjacent areas with a spacing of 1mm, each of which is 1mm*3mm, and the area between the plasticized bonding points that is not plasticized is 1mm*3mm. In the middle position of the non-plasticized bonding part, the sheet material and the hygroscopic shrinkage material are cut together to form an opening, which is a slit with a width of 0.01mm. Fig.25 As shown, the hygroscopic shrinkage materials on both sides of the opening each have a free end 201-2 of 0.5 mm in length, where the free end 201-2 refers to the portion of the hygroscopic shrinkage material that is not plasticized and bonded to the sheet material.

[0271] The finished product was tested using the national standard test instrument for diapers, and the change in the opening size was measured. The test data is shown in Table 8:

[0272] Absorption per time / s Secondary absorption / s Opening width / mm Re-seepage amount / g Example 10 15 52 2.5 5 Comparative Example 10-1 17 57 1.5 7.1

[0273] Table 8 Performance comparison of materials with free ends and non-free ends at plasticized bonding points

[0274] As can be seen from the above table, compared with Example 10-1, Example 10 has a primary absorption speed increased by 12%, a secondary absorption speed increased by 9%, an opening width increased by 71%, and a re-seepage amount decreased by 42%. After observation, it was found that in Comparative Example 10-1, since the end of the hygroscopic shrinkage material was not fixed, this part of the hygroscopic shrinkage material had no traction effect on the surface layer and could not completely open the opening. Further observations found that after absorption, especially after multiple absorptions, the free end of the hygroscopic shrinkage material that was not plasticized and fixed melted and broke, which in turn affected the fixation of the hygroscopic shrinkage material to the surface layer material, causing the opening to fail to close.

[0275] 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 wet-activated opening change material, characterized in that: It comprises a sheet material (101), wherein a hygroscopic shrinkage material (201) is arranged inside the sheet material (101); Part of the hygroscopic shrinkage material (201) is fixed to the sheet material (101) via plasticized bonding points (102); The plasticized bonding point (102) is provided with an opening (202), and the opening (202) penetrates the plasticized bonding point (102) and the hygroscopic shrinkage material (201) at the plasticized bonding point (102).

2. A wet-activated opening change material, characterized in that: It comprises a sheet material (101), and a hygroscopic shrinkage material (201) is arranged on the surface of the sheet material (101); Part of the hygroscopic shrinkage material (201) is fixed to the sheet material (101) via plasticized bonding points (102); The plasticized bonding point (102) is provided with an opening (202), and the opening (202) penetrates the plasticized bonding point (102) and the hygroscopic shrinkage material (201) at the plasticized bonding point (102).

3. The moisture-activated opening change material according to claim 1 or 2, characterized in that: The hygroscopic shrinkage material (201) has an end at or adjacent to the opening (202); All the ends are fixed to the sheet (101) via plasticized bonding 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 bonding point (102) on the sheet (101).

4. The wet-activated opening change material according to claim 3, characterized in that: The non-free end (201-1) of the hygroscopic shrinkage material (201) is flush with the edge of the opening (202) or there is a gap between them.

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

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

7. The moisture-activated opening change material according to claim 1 or 2, characterized in that: The sheet material (101) and the hygroscopic shrinkage material (201) are melted by one or more methods including high temperature, high pressure, ultrasound and laser, and the sheet material (101) and the hygroscopic shrinkage material (201) are mutually infiltrated, cooled and plasticized to form the plasticized bonding point (102).

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

9. The moisture-activated opening change material according to claim 1 or 2, characterized in that: The hygroscopic shrinkage material (201) is one or more of yarn made of PVA fiber, hygroscopic shrinkage strip or hygroscopic shrinkage cloth made of PVA resin; When the hygroscopic shrinkage material (201) is a hygroscopic shrinkage strip or a hygroscopic shrinkage cloth, the thickness of the hygroscopic shrinkage strip or the hygroscopic shrinkage cloth is 0.1 to 5 mm, and the gram weight is 0.01 to 500 g / m 2 ; When the hygroscopic shrinkage material (201) is yarn, the yarns on both sides of the opening (202) are of the same or different thickness, and / or of the same or different quantity, and / or are parallel or form an angle along the length extension direction.

10. The moisture-activated opening change material according to claim 1 or 2, characterized in that: The hygroscopic shrinkage material (201) has a hygroscopic response time of 0 to 60 seconds.

11. The moisture-activated opening change material according to claim 1 or 2, characterized in that: The hygroscopic shrinkage rate of the hygroscopic shrinkage material (201) is 1 to 95%.

12. The moisture-activated opening change material according to claim 1 or 2, characterized in that: The opening (202) is one or more of 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 two ends of a slit connected to circular holes; The slits are all located at the plasticized bonding points (102), or partially located at the non-plasticized bonding areas of the sheet (101); The surface area of ​​the opening (202) accounts for 1 to 99% of the surface area of ​​the plasticized bonding point (102).

13. The moisture-activated opening change material according to claim 2, characterized in that: The hygroscopic shrinkage material (201) is arranged on the upper surface or the lower surface of the sheet (101); Or: the hygroscopic shrinkage material (201) passes through the sheet (101) and is arranged on both the upper surface and the lower surface of the sheet.

14. A method for processing a moisture-activated opening-changing material according to any one of claims 3 to 12, characterized in that: The hygroscopic shrinkage material (201) and the sheet material (101) are stacked; the sheet material (101) and the hygroscopic shrinkage material (201) are first fixed by a bonding mechanism (301) to form a plasticized bonding point (102); and an opening (202) is processed on the plasticized bonding point (102) by an opening mechanism (302); Or: stacking the hygroscopic shrinkage material (201) and the sheet (101); firstly processing the opening (202) on the sheet (101) and the hygroscopic shrinkage material (201) by means of the opening mechanism (302); and then fixing the sheet (101) and the hygroscopic shrinkage material (201) by means of the bonding mechanism (301) to form a plasticized bonding point (102); Or: stacking the hygroscopic shrinkage material (201) and the sheet (101); processing an opening (202) on the sheet (101) and the hygroscopic shrinkage material (201) by means of an opening mechanism (302), and simultaneously fixing the sheet (101) and the hygroscopic shrinkage material (201) by means of a bonding mechanism (301) to form a plasticized bonding point (102); Or: placing the hygroscopic shrinkage material (201) inside the sheet (101), first fixing the sheet (101) and the hygroscopic shrinkage material (201) by means of a bonding mechanism (301) to form a plasticized bonding point (102); and then processing an opening (202) on the plasticized bonding point (102) by means of an opening mechanism (302); Or: placing the hygroscopic shrinkage material (201) inside the sheet (101), firstly processing the opening (202) on the sheet and the hygroscopic shrinkage material by means of the opening mechanism (302), and then fixing the sheet (101) and the hygroscopic shrinkage material (201) by means of the bonding mechanism (301) to form a plasticized bonding point (102); Or: placing the hygroscopic shrinkage material (201) inside the sheet (101), fixing the sheet (101) and the hygroscopic shrinkage material (201) by means of a bonding mechanism (301) to form a plasticized bonding point (102); and simultaneously processing an opening (202) on the plasticized bonding point (102) by means of an opening mechanism (302); Or: the hygroscopic shrinkage material (201) is interlaced on the upper and lower surfaces of the sheet material (101), and the sheet material (101) and the hygroscopic shrinkage material (201) are first fixed by a bonding mechanism (301) to form a plasticized bonding point (102); and then an opening (202) is processed on the plasticized bonding point (102) by an opening mechanism (302); Or: the hygroscopic shrinkage material (201) is interlaced on the upper and lower surfaces of the sheet material (101), the opening (202) is first processed on the sheet material and the hygroscopic shrinkage material by the opening mechanism (302), and then the sheet material (101) and the hygroscopic shrinkage material (201) are fixed by the bonding mechanism (301) to form a plasticized bonding point (102); Or: the hygroscopic shrinkage material (201) is interlaced between the upper and lower surfaces of the sheet (101), and the sheet (101) and the hygroscopic shrinkage material (201) are fixed by a bonding mechanism (301) to form a plasticized bonding point (102); and an opening (202) is simultaneously processed on the plasticized bonding point (102) by an opening mechanism (302).

15. A sanitary product, characterized in that: The sanitary product contains the moisture-active opening change material according to any one of claims 1 to 13.

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