A paper diaper with a double-layer core and a partitioned absorption

Abstract

The utility model discloses a paper diaper of double -deck core zoning absorption belongs to absorbent sanitary article technical field, including the flow face layer that sets gradually from top to bottom, upper core, lower core, bottom, and the flow face layer both sides are equipped with the upwardly extending leakproof partition of horizontal direction, and the diffusion permeable layer is equipped with between the upper core and lower core, and the diffusion permeable layer surface is equipped with a plurality of permeable holes, and the diffusion permeable layer top is equipped with a plurality of diffusion embossed lines that extend horizontally, and the upper core bottom center is equipped with the diffusion recess that extends along the longitudinal direction, and the lower core top is equipped with the convex part that is protruding upwards and is matched with diffusion recess, the upper core of the utility model discloses and lower core can simultaneously carry out absorption to urine and realize zoning absorption through mutual coordination, improve the efficiency of urine absorption.

Description

Technical Field

[0001] This utility model relates to the field of absorbent hygiene products technology, specifically to a diaper with a double-layer core and zoned absorption. Background Technology

[0002] Currently, disposable diapers typically employ a double-layer composite core structure to address issues like clumping and delamination that are common with traditional wood pulp cores. This double-layer structure allows the upper core to absorb urine while simultaneously accelerating its penetration into the lower core, improving absorption efficiency and preventing clumping and delamination. However, when the double-layer core is used for repeated absorption or when a large amount of urine is absorbed at once, the upper core's absorbency and its ability to promote urine penetration decrease significantly due to the already substantial amount of urine already absorbed. This prevents urine from penetrating the upper core to the lower core for absorption in a short time, thus affecting the overall absorption efficiency of the diaper's core.

[0003] Based on the above, Chinese Patent Publication No. CN214484831U discloses a double-core diaper, including a bottom layer, a top layer, a double-core, and a flow channel. The double-core includes an upper core and a lower core. The upper core includes an upper dust-free paper, an upper absorbent polymer layer, and a fluffy fabric. The upper absorbent polymer layer is located between the upper dust-free paper and the fluffy fabric. The lower core includes a lower absorbent polymer layer, a lower dust-free paper, and a bottom layer of wood pulp. Two flow channels are provided. The top layer is fixedly installed on the upper surface of the bottom layer, the double-core is fixedly installed inside the top layer, and the two flow channels are opened on the surface of the double-core.

[0004] The aforementioned patent document discloses a diaper with a double-layer core structure. This diaper has advantages such as fast absorption speed, large absorption capacity, no clumping, no delamination, and no deformation, which can improve the comfort of use. However, when the diaper is subjected to repeated absorption or a large amount of urine, the upper core absorbs some urine and expands due to the internal polymer, which reduces the absorption efficiency and hinders the downward penetration of urine. This, in turn, hinders the lower core from absorbing urine and reduces the overall absorption efficiency of the double-layer core. Therefore, this diaper still has room for improvement. Utility Model Content

[0005] To address the technical deficiencies in the background art, this utility model proposes a double-layer core diaper with zoned absorption, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows:

[0006] A double-layer core diaper with zoned absorption includes, from top to bottom, a flow-guiding surface layer, an upper core, a lower core, and a bottom layer. The flow-guiding surface layer has upwardly extending leak-proof side panels on both sides. A diffusion and permeation layer is provided between the upper core and the lower core. The surface of the diffusion and permeation layer has several permeation holes. The top of the diffusion and permeation layer has several horizontally extending diffusion embossings. The bottom center of the upper core has a longitudinally extending diffusion groove. The top of the lower core has an upwardly protruding part that matches the diffusion groove.

[0007] As a further technical solution of this utility model, the top of the upper core is provided with a longitudinally extending flow guide groove, and the position of the flow guide groove matches the diffusion groove.

[0008] As a further technical solution of this utility model, the leak-proof partition is composed of an inner partition cloth, a sandwich cloth, and an outer partition cloth. The inner partition cloth extends from the top of the leak-proof partition to the horizontal edge of the top of the lower core. The sandwich cloth extends from the top of the leak-proof partition to the horizontal edge of the bottom of the lower core. The outer partition cloth extends from the top of the leak-proof partition to the horizontal edge of the bottom layer.

[0009] As a further technical solution of this utility model, a flow channel is formed between the inner side lining fabric and the interlayer fabric, and a longitudinally extending side lining elastic is provided between the interlayer fabric and the outer side lining fabric. The surface of the inner side lining fabric is provided with a plurality of through holes that penetrate to the flow channel.

[0010] As a further technical solution of this utility model, the surface of the flow guiding layer is provided with a plurality of flow guiding embossings extending from the flow guiding groove to the lateral edge of the flow guiding layer.

[0011] As a further technical solution of this utility model, the upper core is composed of a first covering fabric, a first absorbent layer, and a second covering fabric from top to bottom, and the lower core is composed of a third covering fabric, a second absorbent layer, a fluffy cotton layer, a third absorbent layer, and a fourth covering fabric from top to bottom.

[0012] As a further technical solution of this utility model, the bottom layer is composed of a diffusion cloth, a leak-proof bottom film, and a surface cloth from top to bottom.

[0013] As a further technical solution of this utility model, the diffusion fabric and the surface fabric extend outward from both ends along the longitudinal direction and together form the front waistband and the back waistband. The front waistband is provided with fixed waist patches on both sides in the transverse direction, and the surface of the back waistband is provided with a waist patch area that matches the fixed waist patch.

[0014] The beneficial effects of this utility model are as follows:

[0015] The diaper of this invention has a double core structure consisting of an upper core and a lower core. The upper core promotes urine diffusion and downward penetration through the guide grooves and diffusion grooves. The protrusions of the lower core cause the diffusion and penetration layer to extend downwards on both sides laterally. Urine diffuses over a wide area through the diffusion embossing and quickly penetrates into the lower core through the penetration holes. This allows the upper and lower cores to absorb urine simultaneously and achieve zoned absorption through mutual cooperation, thereby improving the efficiency of urine absorption. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a diaper with a double-layer core and zoned absorption.

[0017] Figure 2 This is a top view of the diffusion and permeation layer of a dual-core, zoned absorbent diaper.

[0018] Figure 3 This is a cross-sectional view of the upper and lower cores of a double-core absorbent diaper.

[0019] Figure 4 This is a schematic diagram of a double-layer core diaper with zoned absorption.

[0020] The components are: 1-Guiding surface layer, 11-Guiding embossing, 2-Upper core, 21-Diffusion groove, 22-Guiding groove, 23-First covering fabric, 24-First absorbent layer, 25-Second covering fabric, 3-Lower core, 31-Protrusion, 32-Third covering fabric, 33-Second absorbent layer, 34-Fluffy cotton layer, 35-Third absorbent layer, 36-Fourth covering fabric, 4-Bottom layer, 41-Diffusion fabric, 42-Leak-proof bottom membrane, 43-Surface fabric, 5-Leak-proof side panel, 51-Inner side panel fabric, 52-Interlayer fabric, 53-Outer side panel fabric, 54-Guiding channel, 55-Side elastic band, 6-Diffusion permeation layer, 61-Permeation hole, 62-Diffusion embossing, 7-Front waistband, 71-Fixing waist patch, 8-Rear waistband. Detailed Implementation

[0021] The embodiments of this utility model will be described below with reference to the accompanying drawings and related examples. The embodiments of this utility model are not limited to the following examples, and this utility model relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0022] Reference Figure 1 , Figure 2 , Figure 3A double-core diaper with zoned absorption includes, from top to bottom, a flow-guiding surface layer 1, an upper core 2, a lower core 3, and a bottom layer 4. The flow-guiding surface layer 1 has upwardly extending leak-proof partitions 5 on both sides. A diffusion and permeation layer 6 is provided between the upper core 2 and the lower core 3. The surface of the diffusion and permeation layer 6 has several permeation holes 61. The top of the diffusion and permeation layer 6 has several horizontally extending diffusion embossing 62. The bottom center of the upper core 2 has a longitudinally extending diffusion groove 21. The top of the lower core 3 has an upwardly protruding part 31 that matches the diffusion groove 21.

[0023] The diaper of this invention can be used as a baby diaper or an adult diaper. The diversion surface layer 1 is preferably made of hot-air nonwoven fabric. The diversion surface layer 1 is in direct contact with the human body. Using hot-air nonwoven fabric can improve the comfort of the diaper in contact with the human body. In addition, two leak-proof partitions 5 are provided on both sides of the diversion surface layer 1 to prevent urine from leaking from the leg openings during the use of the diaper.

[0024] The upper core 2 and lower core 3 of this invention serve as the main structures for absorbing urine inside the diaper. The upper core 2 is composed of a first covering fabric 23, a first absorbent layer 24, and a second covering fabric 25 from top to bottom. The lower core 3 is composed of a third covering fabric 32, a second absorbent layer 33, a fluffy cotton layer 34, a third absorbent layer 35, and a fourth covering fabric 36 from top to bottom. The first covering fabric 23 and the third covering fabric 32 are preferably spunbond nonwoven fabrics, which can effectively prevent urine backflow. The first absorbent layer 24, the second absorbent layer 33, and the third absorbent layer 35 are preferably absorbent resins. The fluffy cotton layer 34 is preferably a mesh structure layer made of fluffy cotton, which can constrain the absorbent resin and prevent clumping inside the lower core 3, and improve the diffusion efficiency of urine inside the lower core 3. The second covering fabric 25 and the fourth covering fabric 36 are preferably dust-free paper, which can make urine diffuse more evenly.

[0025] The bottom layer 4 of this utility model is composed of a diffusion fabric 41, a leak-proof bottom film 42, and a top layer fabric 43 from top to bottom. The diffusion fabric 41 is preferably SMS non-woven fabric. The main function of the diffusion fabric 41 is to promote the uniform diffusion of urine that has penetrated to the bottom of the lower core 3. The leak-proof bottom film 42 is preferably a waterproof and breathable PE film. The leak-proof bottom film 42 can prevent urine inside the diaper from leaking to the outside and ensure the breathability of the diaper. The top layer fabric 43 is preferably SSS non-woven fabric. The top layer fabric 43 is located on the outside of the diaper. The top layer fabric 43 can improve the softness and strength of the diaper surface.

[0026] During the use of diapers, after the user urinates, the urine usually concentrates from the center of the diversion surface layer 1 and permeates into the upper core 2. Because the upper core 2 has a longitudinally extending diffusion groove 21 at the bottom center, the thickness of the upper core 2 at the center is relatively low, and the urine can penetrate the upper core 2 more quickly and permeate into the diffusion permeation layer 6. The protrusion 31 of the lower core 3 causes the diffusion permeation layer 6 to extend downwards on both sides laterally. The diffusion permeation layer 6 is preferably made of SSS non-woven fabric and formed with several laterally extending diffusion embossing 62 by an embossing process. The diffusion permeation layer 6 promotes the diffusion of urine to both sides laterally through the downwardly recessed diffusion embossing 62 at the top. During the diffusion process, the urine quickly permeates downwards into the lower core 3 through the permeation holes 61.

[0027] Furthermore, the pore size of the permeation pore 61 gradually decreases from top to bottom. The permeation pore 61 can improve the efficiency of urine permeation downward through the gradient change of capillary effect and prevent urine from seeping back into the upper core 2. Combined with the structure of the upper core 2 and the lower core 3 and their mutual cooperation, the upper core 2 absorbs urine while the urine permeates rapidly into the lower core 3 through the diffusion groove 21 and the diffusion permeation layer 6, so that the urine is absorbed by both the upper core 2 and the lower core 3 at the same time, thereby improving the efficiency of urine absorption of the diaper.

[0028] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 3 The top of the upper core 2 is provided with a longitudinally extending guide groove 22. The position of the guide groove 22 matches the diffusion groove 21. During the process of diaper absorbing urine, the guide groove 22 can promote the longitudinal diffusion of urine, increase the diffusion range of urine and the contact area with the upper core 2, and improve the efficiency of urine absorption. The combination of the guide groove 22 and the diffusion groove 21 can further reduce the thickness of the central position of the upper core 2, thereby increasing the speed at which urine penetrates to the lower core 3.

[0029] After adopting the above structure, it should be further explained that, referring to Figure 4 The surface of the flow guiding layer 1 is provided with a number of flow guiding embossings 11 extending laterally from the flow guiding groove 22 to the lateral edge of the flow guiding layer 1. The flow guiding layer 1 forms a number of laterally extending flow guiding embossings 11 through an embossing process. These flow guiding embossings 11 can promote the lateral diffusion of some urine that is retained in the flow guiding groove 22, which is beneficial to increasing the contact area between urine and the upper core 2, thereby improving the efficiency of urine absorption by the upper core 2.

[0030] With the above structure, it should be further explained that the upper core 2 has a longitudinally extending flow guide groove 22 and a diffusion groove 21 at the top center and bottom center, respectively. During the manufacturing process of the upper core 2, by not applying water-absorbing resin at its center, a longitudinally extending groove without water-absorbing resin is formed inside it. This groove can form the flow guide groove 22 and the diffusion groove 21 at the top and bottom of the upper core 2, respectively. During the manufacturing process of the lower core 3, by applying more water-absorbing resin at its top center or less water-absorbing resin on its lateral sides, an upwardly protruding protrusion 31 is formed at the center.

[0031] During the use of diapers, urine usually concentrates in the center and is discharged. The upper core 2 and the lower core 3 work together through the diffusion groove 21 and the protrusion 31 to promote urine penetration and diffusion, so that the upper core 2 and the lower core 3 can absorb urine simultaneously and in sections, which helps to improve the efficiency of urine absorption.

[0032] As one of the preferred embodiments of this utility model, refer to Figure 1 The leak-proof partition 5 is composed of an inner partition cloth 51, a sandwich cloth 52, and an outer partition cloth 53. The inner partition cloth 51 extends from the top of the leak-proof partition 5 to the top horizontal edge of the lower core 3. The sandwich cloth 52 extends from the top of the leak-proof partition 5 to the bottom horizontal edge of the lower core 3. The outer partition cloth 53 extends from the top of the leak-proof partition 5 to the bottom horizontal edge of the bottom layer 4. A flow channel 54 is formed between the inner partition cloth 51 and the sandwich cloth 52. A longitudinally extending partition elastic band 55 is provided between the sandwich cloth 52 and the outer partition cloth 53. The surface of the inner partition cloth 51 is provided with several through holes that penetrate to the flow channel 54.

[0033] The inner side panel 51 is preferably spunlace nonwoven fabric, and the interlayer fabric 52 and the outer side panel 53 are preferably waterproof nonwoven fabrics and integrally formed. The leak-proof side panel 5 can prevent urine from flowing laterally on the surface of the diversion layer 1 to prevent side leakage. The inner side panel 51 promotes the urine to extend along the inner side panel 51 to the top of the lower core 3 through good hydrophilicity. The inner side panel 51 also absorbs urine into the diversion channel 54 through the through holes on the surface. Urine can flow to the side and bottom of the lower core 3 through the diversion channel 54, so that the lower core 3 can efficiently absorb urine. During the flow of urine along the diversion channel 54, the interlayer fabric 52 and the outer side panel 53 can prevent urine from seeping to the outside of the diaper.

[0034] With the above structure, it should be further explained that when the diaper repeatedly absorbs urine, or when a large amount of urine needs to be absorbed at one time, such as in the case of adult diapers, the urine usually stays on the surface of the diversion layer 1 for a longer time. Furthermore, the upper core 2, which is close to the diversion layer 1, usually becomes saturated first, while the lower core can still absorb a large amount of urine. In conventional diapers, the upper core 2 reduces the efficiency of urine penetration into the lower core 3, thereby further prolonging the time that urine stays on the surface and reducing the comfort of the diaper. However, in the diaper of this invention, the urine that remains on the surface of the diversion layer 1 can be diverted to the lower core 3 through the diversion embossing 11 and the leak-proof partition 5. The upper core 2 and the lower core 3 work together to absorb urine in separate zones, thereby improving the diaper's urine absorption efficiency.

[0035] As one of the preferred embodiments of this utility model, the diffusion fabric 41 and the surface fabric 43 extend outward along both ends in the longitudinal direction and together form the front waistband 7 and the back waistband 8. The front waistband 7 is provided with fixing waist stickers 71 on both sides in the lateral direction, and the surface of the back waistband 8 is provided with waist sticker areas that match the fixing waist stickers 71. Several horizontally extending elastic bands can be provided inside the front waistband 7 to improve the restraint of the diaper waistband. The fixing waist stickers 71 and the waist sticker areas are preferably matched with Velcro, so that the diaper can be better restrained and fixed to the user's waist through the waistband.

[0036] In summary, the diaper of this invention has a double-layer core structure formed by an upper core 2 and a lower core 3. The upper core 2 promotes urine diffusion and downward penetration through the guide groove 22 and diffusion groove 21. The protrusion 31 of the lower core 3 causes the diffusion and penetration layer 6 to extend downward on both sides laterally. Urine diffuses over a wide area through the diffusion embossing 62 and quickly penetrates into the lower core 3 through the penetration holes 61. This allows the upper core 2 and the lower core 3 to absorb urine simultaneously and achieve zoned absorption through mutual cooperation, thereby improving the efficiency of urine absorption.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A double-layer core-partitioned absorbent diaper, comprising a diversion surface layer (1), an upper core (2), a lower core (3), and a bottom layer (4) arranged sequentially from top to bottom, characterized in that, The flow guide layer (1) has upwardly extending leak-proof partitions (5) on both sides of the transverse direction. A diffusion permeation layer (6) is provided between the upper core (2) and the lower core (3). A number of permeation holes (61) are penetrating the surface of the diffusion permeation layer (6). A number of transversely extending diffusion embossing (62) is provided on the top of the diffusion permeation layer (6). A longitudinally extending diffusion groove (21) is provided at the center of the bottom of the upper core (2). A protruding part (31) that protrudes upward and matches the diffusion groove (21) is provided on the top of the lower core (3).

2. The diaper with dual-layer core and zoned absorption according to claim 1, characterized in that, The top of the upper core (2) is provided with a longitudinally extending flow guide groove (22), and the position of the flow guide groove (22) matches that of the diffusion groove (21).

3. The diaper with dual-layer core and zoned absorption according to claim 1, characterized in that, The leak-proof partition (5) is composed of an inner partition fabric (51), a sandwich fabric (52), and an outer partition fabric (53). The inner partition fabric (51) extends from the top of the leak-proof partition (5) to the top horizontal edge of the lower core (3). The sandwich fabric (52) extends from the top of the leak-proof partition (5) to the bottom horizontal edge of the lower core (3). The outer partition fabric (53) extends from the top of the leak-proof partition (5) to the bottom horizontal edge of the bottom layer (4).

4. The diaper with dual-layer core and zoned absorption according to claim 3, characterized in that, A flow channel (54) is formed between the inner side lining fabric (51) and the interlayer fabric (52). A longitudinally extending side lining elastic (55) is provided between the interlayer fabric (52) and the outer side lining fabric (53). A plurality of through holes penetrating into the flow channel (54) are provided on the surface of the inner side lining fabric (51).

5. The diaper with dual-layer core and zoned absorption according to claim 2, characterized in that, The surface of the flow guiding layer (1) is provided with a plurality of flow guiding embossing (11) extending from the flow guiding groove (22) to the lateral edge of the flow guiding layer (1).

6. The diaper with dual-layer core and zoned absorption according to claim 1, characterized in that, The upper core (2) is composed of a first covering fabric (23), a first absorbent layer (24), and a second covering fabric (25) from top to bottom. The lower core (3) is composed of a third covering fabric (32), a second absorbent layer (33), a fluffy cotton layer (34), a third absorbent layer (35), and a fourth covering fabric (36) from top to bottom.

7. The diaper with dual-layer core and zoned absorption according to claim 1, characterized in that, The bottom layer (4) consists of a diffusion fabric (41), a leak-proof bottom membrane (42), and a surface fabric (43) from top to bottom.

8. The diaper with dual-layer core and zoned absorption according to claim 7, characterized in that, The diffusion fabric (41) and the surface fabric (43) extend outward along both ends in the longitudinal direction and together form the front waistband (7) and the back waistband (8). The front waistband (7) has fixed waist patches (71) on both sides in the transverse direction, and the surface of the back waistband (8) has waist patch areas that match the fixed waist patches (71).

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