Rapidly absorbing dry core

Abstract

The present invention relates to the field of disposable sanitary products, and in particular to a rapid-absorbent, dry core with high water absorption efficiency. The rapid-absorbent, dry core comprises an absorbent core main body, which comprises an upper nonwoven fabric, a fluffy nonwoven fabric, and a lower nonwoven fabric, the fluffy nonwoven fabric having a polymeric water-absorbing resin material on its upper and lower surfaces, respectively, which is fitted into the gaps in the fluffy nonwoven fabric, the density of the polymeric water-absorbing resin material in the fluffy nonwoven fabric decreasing stepwise from the longitudinal center to both longitudinal ends of the fluffy nonwoven fabric, and the upper nonwoven fabric has a fluffy The upper surface of the absorbent core is compounded with the fluffy nonwoven fabric, and the lower nonwoven fabric is compounded with the fluffy nonwoven fabric's underside. Two guide grooves are press-molded in the longitudinal center of the absorbent core main body. The upper nonwoven fabric, the fluffy nonwoven fabric, and the lower nonwoven fabric are fixedly connected at the longitudinal center of the guide grooves via thermocompression or ultrasonic welding, so that the water absorption capacity of the absorbent core main body increases stepwise from one longitudinal end to the other longitudinal end and then decreases stepwise again.

Description

[Technical Field]

[0001] The present invention relates to the field of disposable hygiene products, and in particular to fast-absorbing dry cores. [Background technology]

[0002] Absorbent cores are widely used in nursing absorbent products such as diapers and napkins. Conventional absorbent cores are made by mixing pulp fibers and high-molecular-weight absorbent resin materials, and wrapping the mixture in a block-like configuration with nonwoven fabric. These absorbent cores are prone to undulation and tearing during use, and are relatively thick and have poor gas permeability, reducing comfort for the user.

[0003] The absorbent cores currently in widespread use on the market are made by sandwiching a polymeric water-absorbent resin material between two or three layers of nonwoven fabric, spreading the polymeric water-absorbent resin material on the top surface of one of the nonwoven fabric layers, and then spraying an adhesive to combine it with the other layers of nonwoven fabric. Although such absorbent cores are relatively thick, it is difficult to fix the polymeric water-absorbent resin material, and the polymeric water-absorbent resin material is prone to deflection and leakage, which severely affects the water absorption efficiency. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, in response to the above problems, the present invention provides a fast-absorbing dry core with high water absorption efficiency. [Means for solving the problem]

[0005] To achieve the above object, the present invention adopts the following technical solutions.

[0006] The rapid absorption and drying core body includes an absorbent core main body, and the direction extending along its length is defined as the longitudinal direction, and the direction extending along its width is defined as the transverse direction. The absorbent core main body includes an upper nonwoven fabric, a fluffy nonwoven fabric, and a lower nonwoven fabric. The fluffy nonwoven fabric has a polymeric water-absorbing resin material on its upper and lower surfaces, respectively, and the polymeric water-absorbing resin material is fitted into the gaps in the fluffy nonwoven fabric. The density of the polymeric water-absorbing resin material in the fluffy nonwoven fabric decreases stepwise from the center in the longitudinal direction of the fluffy nonwoven fabric to both ends in the longitudinal direction. The upper nonwoven fabric is bonded to the upper surface of the fluffy nonwoven fabric with an adhesive, and the lower nonwoven fabric is bonded to the lower surface of the fluffy nonwoven fabric with an adhesive. The transverse width dimension of the lower nonwoven fabric is equal to the transverse width dimension of the fluffy nonwoven fabric. The length of the lower nonwoven fabric is 8mm to 25mm larger than the width dimension in the axial direction, and both lateral sides of the lower nonwoven fabric are folded upward and inward and attached to the upper surface of the upper nonwoven fabric, and are fixedly connected to the upper nonwoven fabric and the fluffy nonwoven fabric by thermocompression or ultrasonic welding, and both longitudinal ends of the upper nonwoven fabric are fixedly connected to the fluffy nonwoven fabric and the lower nonwoven fabric by thermocompression or ultrasonic welding, and the longitudinal center part of the absorbent core main body is pressure-molded into two guide grooves arranged and distributed along the longitudinal direction, and the longitudinal center parts of the guide grooves are fixedly connected to the upper nonwoven fabric, the fluffy nonwoven fabric and the lower nonwoven fabric by thermocompression or ultrasonic welding, and the water absorption capacity of the absorbent core main body increases stepwise from one longitudinal end to the other longitudinal end and then decreases stepwise again.

[0007] Preferably, the two guide grooves are configured in an arcuate shape and are distributed symmetrically about the lateral central axis of the absorbent core main body.

[0008] Preferably, the region located in the guide groove is free from a polymeric water-absorbent resin material.

[0009] Preferably, the ratio of the length of the welded region in the guide groove in the vertical direction to the length of the guide groove in the vertical direction is 0.5 to 0.85:1.

[0010] Preferably, the ratio of the length in the vertical direction of the guide groove to the length in the vertical direction of the absorbent core main body is 0.6 to 0.8:1.

[0011] Preferably, the width dimension in the lateral direction of the upper-layer nonwoven fabric is 8 mm to 25 mm larger than the width dimension in the lateral direction of the fluffy nonwoven fabric, and both sides of the lateral direction of the upper-layer nonwoven fabric are folded upward and inward and sandwiched between the folding areas of the lower-layer nonwoven fabric and the upper-layer nonwoven fabric. [Effects of the Invention]

[0012] By adopting the above technical solution, the beneficial effects of the present invention are as follows: The rapid-absorbency dry core of the present invention is manufactured by periodically adding a polymeric absorbent resin material to the top and bottom surfaces of a fluffy nonwoven fabric. This allows the absorbency of the resulting absorbent core body to increase stepwise from one longitudinal end to the other, then decrease stepwise again. This reduces the amount of polymeric absorbent resin material on both longitudinal sides of the absorbent core body, thereby reducing costs. Furthermore, portions of the polymeric absorbent resin material are inserted into gaps in the fluffy nonwoven fabric to limit and fix their position when the fluffy nonwoven fabric rolls or sways. At the same time, by maintaining a distribution characteristic of the polymeric absorbent resin material content in a single absorbent core body, the polymeric absorbent resin material is concentrated in the longitudinal center region of the absorbent core body, which prioritizes its absorption function, improving absorption efficiency and reducing production costs. This achieves rapid absorption while reducing leakage of the polymeric absorbent resin material, thereby maintaining excellent absorbency. When the fluffy nonwoven fabric and the upper nonwoven fabric are combined using an adhesive, the guide groove is press-molded, and the lower nonwoven fabric is combined. Then, the upper nonwoven fabric, the fluffy nonwoven fabric, and the lower nonwoven fabric are fixedly connected in the longitudinal central region of the guide groove by thermocompression or ultrasonic welding. This prevents the material from deflecting when the guide groove is press-molded, improves the precision of the press-molding, and even when a large amount of liquid is absorbed in the welded region of the guide groove, the excellent structure of the guide groove can be maintained, providing excellent guiding effects and increasing the absorption speed of the product. The adhesive and combined form is realized at both ends of the longitudinal direction of the guide groove, providing an expansion buffer space when the polymer absorbent resin material expands too much due to water absorption. When the upper nonwoven fabric and the lower nonwoven fabric separate from the fluffy nonwoven fabric, the polymer absorbent resin material located on the peripheral side of that region increases its water absorption capacity and expands, thereby increasing the water absorption capacity. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a configuration of an embodiment of the present invention as viewed from above; [Figure 2] FIG. 2 is a schematic diagram showing the cross section of AA in FIG. 1. [Figure 3] FIG. 2 is a schematic diagram showing a cross-sectional configuration of BB in FIG. [Figure 4] 1 is a schematic diagram showing a flow configuration of a manufacturing method according to an embodiment of the present invention. [Figure 5] 1A to 1C are schematic diagrams illustrating a flow of construction in a three-dimensional manner in a manufacturing method according to an embodiment of the present invention. [Figure 6] FIG. 10 is a distribution diagram showing the amount of absorbed water extending along the longitudinal direction of the absorbent core main body according to an embodiment of the present invention. [Figure 7] 1 is a schematic diagram showing a cross-sectional configuration of a feed roller according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] The invention will be further described with reference to the drawings and specific embodiments.

[0015] An embodiment of the present invention is as follows. As shown in Figures 1, 2, and 3, the quick-absorbing and dry core includes an absorbent core main body 10. If the direction extending along its length is defined as the longitudinal direction and the direction extending along its width as the transverse direction, the absorbent core main body 10 includes an upper-layer nonwoven fabric 2, a fluffy nonwoven fabric 1, and a lower-layer nonwoven fabric 3. The fluffy nonwoven fabric 1 has a polymeric water-absorbent resin material 4 and a polymeric water-absorbent resin material 5 on its upper surface a' and lower surface b', respectively. The polymeric water-absorbent resin materials (4, 5) are each periodically added and distributed in the fluffy nonwoven fabric 1, and the polymeric water-absorbent resin materials (4, 5) fit into the gaps in the fluffy nonwoven fabric 1. In the fluffy nonwoven fabric 1, the density of the polymeric water-absorbent resin materials (4, 5) decreases stepwise from the center of the fluffy nonwoven fabric 1 in the longitudinal direction to both ends in the longitudinal direction. The upper-layer nonwoven fabric 2 is bonded to the upper surface a' of the fluffy nonwoven fabric 1 with an adhesive. The lower-layer nonwoven fabric 3 is bonded to the lower surface b' of the fluffy nonwoven fabric 1 with an adhesive. The width dimension in the lateral direction of the lower-layer nonwoven fabric 3 is 8 mm to 25 mm larger, preferably 16 mm larger, than the width dimension in the lateral direction of the fluffy nonwoven fabric 1. Both lateral sides c' of the lower-layer nonwoven fabric 3 are folded upward and inward and attached to the upper surface of the upper-layer nonwoven fabric 2, and are fixedly connected to the upper-layer nonwoven fabric 2 and the fluffy nonwoven fabric 1 by ultrasonic welding. Both longitudinal ends of the upper-layer nonwoven fabric 2 are fixedly connected to the fluffy nonwoven fabric 1 and the lower-layer nonwoven fabric 3 by ultrasonic welding. Two guide grooves 6 are press-molded in the longitudinal center of the absorbent core main body 10. The two guide grooves 6 are arc-shaped and symmetrically distributed about the lateral central axis of the absorbent core main body 10. The two guide grooves 6 are aligned in the longitudinal direction. No polymeric water-absorbent resin material (4, 5) is added to the area where the guide grooves 6 are located. The longitudinal center of the guide grooves 6 securely connects the upper nonwoven fabric, the fluffy nonwoven fabric 1, and the lower nonwoven fabric 3 via ultrasonic welding. The absorbency of the absorbent core main body 10 increases stepwise from one longitudinal end to the other longitudinal end, and then decreases stepwise again. The ratio of the longitudinal length of the welded area d' to the longitudinal length of the guide grooves 6 is 0.5 to 0.85:1, preferably 0.75:1.The ratio of the length in the vertical direction of the guide groove 6 to the length in the vertical direction of the absorbent core main body 10 is 0.6 to 0.8:1, and preferably the ratio is 0.7:1.

[0016] The width dimension in the lateral direction of the upper-layer nonwoven fabric 2 is 8 mm to 25 mm larger, preferably 14 mm larger, than the width dimension in the lateral direction of the fluffy nonwoven fabric 1. Both lateral sides e' of the upper-layer nonwoven fabric 2 are folded upward and inward and sandwiched between the folded regions c' of the lower-layer nonwoven fabric 3 and the upper-layer nonwoven fabric 2.

[0017] As shown in FIGS. 4 to 7, the method for manufacturing the fast absorbing dry core includes the following steps. 1) The step of manufacturing a core layer has an absorption means for continuous transport in the core layer, and defines the direction extending along the transport direction in the core layer as the longitudinal direction and the direction extending along its width as the transverse direction. a) The fluffy nonwoven fabric 1 is spread and transported by the first spreading means 11. The first spreading means 11 has a servo motor and is connected to a controller, and the time when the servo motor starts and the rotation speed of the servo motor can be determined through the controller, and therefore the transport starting point and transport speed of the fluffy nonwoven fabric 1 can be determined. b) The transport starting point and transport speed of the fluffy nonwoven fabric 1 in step a are obtained, and the boundaries of each absorbing means are identified based on the longitudinal length dimensions of the absorbing means that have been input into the controller in advance. c) The boundaries of each absorbent means are obtained in step b, and the first supplying means 12 periodically adds the polymeric water-absorbing resin material 4 to the successive absorbent means on the upper surface a' of the fluffy nonwoven fabric 1. Portions of the polymeric water-absorbing resin material 4 are fitted into the gaps in the fluffy nonwoven fabric 1. The first supplying means 12 includes a supplying roller 120, and has at least one supplying area 121 on the outer surface of the supplying roller 120 that coincides with the absorbent means. The coverage area of ​​the supplying area 121 is the area of ​​only a single absorbent means. Preferably, the supplying roller 120 has two supplying areas 121. The feeding area 121 has a material storage groove 122 for storing the polymer water-absorbent resin material, that is, by obtaining the boundary of each absorption means, it is made to correspond to the feeding area 121 on the feeding roller 120, and when the feeding roller 120 rotates to perform feeding, the single feeding area 121 accurately feeds the polymer water-absorbent resin material 4 into the corresponding single absorption means. d) The upper nonwoven fabric 2 is unfolded and transported by the second unfolding means 13. An adhesive is applied to the lower surface of the upper nonwoven fabric 2, and the upper nonwoven fabric 2 is bonded to the upper surface a' of the fluffy nonwoven fabric 1. e) The boundaries of each absorbing means in step b are obtained, and the guide groove 6 is press-molded by the uneven roller means 14 in the center portion of each absorbing means in the vertical direction of the product in step d. f) The product in step e is turned over by 180° to exchange the positions of the upper surface a' and the lower surface b' of the fluffy nonwoven fabric 1, so that the lower surface b' of the fluffy nonwoven fabric 1 is positioned on top. g) The boundaries of each absorbing means in step b are obtained, and the polymer water-absorbing resin material 5 is periodically added to the continuous absorbing means on the lower surface b' of the fluffy nonwoven fabric 1 by the second supplying means 15. The polymer water-absorbing resin material 5 is fitted into the gaps in the fluffy nonwoven fabric 1. h) The lower nonwoven fabric 3 is unfolded and transported by the third unfolding means 16. An adhesive is applied to the lower surface of the lower nonwoven fabric 3, and the lower nonwoven fabric 3 is bonded to the lower surface of the fluffy nonwoven fabric 1. The width dimension in the lateral direction of the lower nonwoven fabric 3 is 8 mm to 25 mm larger than the width dimension of the fluffy nonwoven fabric 1, and preferably 16 mm larger. i) The product in step h is inverted by 180°, and the positions of the upper nonwoven fabric 2 and the lower nonwoven fabric 3 are exchanged. j) The lower nonwoven fabric 3 is folded upward and inward on both sides in the lateral direction, and attached to the upper surface of the upper nonwoven fabric 2, and fixed by thermocompression bonding or ultrasonic welding. k) Obtain the boundaries of each absorption means in step b and the position of the guide groove 6 in step e, and perform thermocompression or ultrasonic welding in the vertical central region of the guide groove 6 in the product in step j to fixedly connect the upper nonwoven fabric 2, the fluffy nonwoven fabric 1 and the lower nonwoven fabric 3. 2) Obtain the boundaries of each absorbent means in step b, and perform thermocompression or ultrasonic welding on both sides of the longitudinal direction of the boundaries of the absorbent means in the core layer in step 1 to fix and connect the upper nonwoven fabric 2, the fluffy nonwoven fabric 1 and the lower nonwoven fabric 3. 3) The boundaries of each absorbent means in step b are obtained, and the cutting means 17 cuts the product in step 2 according to the boundaries of the absorbent means to form unit absorbent core main bodies 10. The absorbency of the absorbent core main bodies 10 increases stepwise from one end in the longitudinal direction to the other end in the longitudinal direction, and then decreases stepwise again.

[0018] In the method for manufacturing a quick-absorbing, dry core according to the present invention, a polymeric absorbent resin material is periodically added to the top and bottom surfaces of a fluffy nonwoven fabric 1, so that the absorbency of the manufactured absorbent core main body 10 increases stepwise from one longitudinal end to the other, and then decreases stepwise again. This reduces the amount of polymeric absorbent resin content on both longitudinal ends of the absorbent core main body 10, thereby reducing costs. Furthermore, when the fluffy nonwoven fabric 1 rolls or shakes, portions of the polymeric absorbent resin material are fitted into gaps in the fluffy nonwoven fabric 1 to limit and fix their position. At the same time, by maintaining the distribution characteristics of the polymeric absorbent resin material content in a single absorbent core main body 10, the polymeric absorbent resin material is concentrated in the longitudinal central region of the absorbent core main body 10, which prioritizes its absorption function, improving absorption efficiency and reducing production costs. This achieves rapid absorption, reduces leakage of the polymeric absorbent resin material, and maintains excellent absorbency. The above manufacturing method allows for product upgrades with relatively minor modifications to existing core production lines, reducing implementation costs. Furthermore, when the fluffy nonwoven fabric 1 and the upper nonwoven fabric 2 are combined with an adhesive, the guide groove 6 is press-formed, and the lower nonwoven fabric 3 is then combined. The upper nonwoven fabric 2, the fluffy nonwoven fabric 1, and the lower nonwoven fabric 3 are then fixedly connected in the longitudinal center region of the guide groove 6 by thermocompression or ultrasonic welding. This prevents material deflection during press-forming of the guide groove 6, improving press-forming accuracy. The welded region of the guide groove 6 maintains the excellent structure of the guide groove 6 even when absorbing a large amount of liquid, providing excellent guiding effects. This increases the product's absorption rate, and allows for the adhesive and composite configuration at both longitudinal ends of the guide groove 6. This provides a buffer space for expansion in the event that the polymeric water-absorbent resin material absorbs water and expands excessively. By separating the upper nonwoven fabric 2 and the lower nonwoven fabric 3 from the fluffy nonwoven fabric 1, the polymeric water-absorbing resin material located on the peripheral side of the area increases its water absorption capacity and becomes expanded, thereby increasing the water absorption capacity.

[0019] Specifically, the density of the polymer absorbent resin material 4 in the absorbent core main body 10 decreases stepwise from the longitudinal center of the absorbent core main body 10 to both longitudinal ends, and the density of the polymer absorbent resin material 5 in the absorbent core main body 10 decreases stepwise from the longitudinal center of the absorbent core main body 10 to both longitudinal ends. As a result, in the circumferential direction of the feeding area 121 of the feeding roller 120, the volume of the material storage groove 122 located in the feeding area 121 first increases and then decreases. The polymer absorbent resin material is periodically added to the fluffy nonwoven fabric 1 by the rotation of the material storage groove 122 and formed in a stepped distribution, which reduces the cost of introducing a feeding roller equipment, and the formed stepped distribution and trend of the polymer absorbent resin material can improve the feeding accuracy of the polymer absorbent resin material and ensure the water absorption efficiency of the produced product.

[0020] Alternatively, the density of the polymer absorbent resin material 4 in the absorbent core main body 10 decreases in a stepwise manner from the vertical center of the absorbent core main body 10 to both vertical ends, and the density of the polymer absorbent resin material 5 in the absorbent core main body 10 is consistent from the vertical center of the absorbent core main body 10 to both vertical ends. Alternatively, the density of the polymer absorbent resin material 4 in the absorbent core main body 10 is consistent from the vertical center of the absorbent core main body 10 to both vertical ends. The density of the polymer absorbent resin material 5 in the absorbent core main body 10 decreases in a stepwise manner from the vertical center of the absorbent core main body 10 to both vertical ends. All of the above can achieve the above-mentioned effects.

[0021] In addition, the polymer water-absorbent resin materials 4 and 5 are not periodically added to the region located in the guide groove 6. This ensures the guiding effect of the guide groove 6, improves the water absorption efficiency, and provides a space for the polymer water-absorbent resin material to further expand, thereby increasing the amount of water absorption.

[0022] In this embodiment, the ratio of the longitudinal length of the welded region to the longitudinal length of the guide groove 6 is 0.5 to 0.85:1, preferably 0.75:1. Moreover, the ratio of the longitudinal length of the guide groove 6 to the longitudinal length of the absorbent core main body 10 is 0.6 to 0.8:1, preferably 0.7:1. As a result, the guide groove 6 distributes the absorbent core main body 10 in a region that is relatively heavily coated with the high-molecular-weight water-absorbent resin material along the longitudinal direction. This allows rapid absorption during guiding, and providing the welded region in the guide groove 6 optimizes the absorption efficiency and absorption capacity of the absorbent core main body 10.

[0023] Moreover, in the above step j, the lateral width of the upper-layer nonwoven fabric 2 is 8 mm to 25 mm larger, preferably 14 mm larger, than the lateral width of the fluffy nonwoven fabric 1. By folding both lateral sides of the upper-layer nonwoven fabric 2 and both lateral sides of the lower-layer nonwoven fabric 3 together upward and inward and sandwiching them between the folded areas of the lower-layer nonwoven fabric 3 and the upper-layer nonwoven fabric 2, leakage of the polymeric water-absorbent resin material from the sides is prevented, and when in use, both lateral sides of the surface of the absorbent core main body 10 act as obstructing edges, preventing liquid leakage from the sides and improving usability.

[0024] The manufactured absorbent core body 10 was tested, and the test data were as follows: JPEG2025527909000002.jpg105170

[0025] Other embodiments of this embodiment are as follows. The method for manufacturing the fast absorbing dry core includes the following steps. 1) A core layer is produced. The core layer has an absorbing means for continuous transport, and the direction extending along the transport direction of the core layer is defined as the longitudinal direction, and the direction extending across the width of the core layer is defined as the transverse direction. a) The fluffy nonwoven fabric 1 is spread and transported by the first spreading means 11. The first spreading means 11 has a servo motor and is connected to a controller, which determines the time when the servo motor starts and the rotation speed of the servo motor, and therefore the transport start point and transport speed of the fluffy nonwoven fabric 1. b) The transport starting point and transport speed of the fluffy nonwoven fabric 1 in step a are obtained, and the boundaries of each absorption means can be identified based on the longitudinal length and dimensions of the absorption means that have been input into the controller in advance. c) The boundaries of each absorbing means are obtained in step b, and the first feeding means 12 periodically adds the polymeric water-absorbent resin material 4 to the continuous absorbing means on the upper surface a' of the fluffy nonwoven fabric 1. Portions of the polymeric water-absorbent resin material 4 are fitted into the gaps in the fluffy nonwoven fabric 1. The first feeding means 12 includes a feeding roller 120, and has a feeding area 121 on the outer surface surrounding the feeding roller 120, which corresponds to at least the absorbing means. The covering area of ​​the feeding area 121 is the area of ​​a single absorbing means. Preferably, the feeding roller 120 has two individual feeding areas 121. The feeding area 121 is provided with a material storage groove 122 for storing the polymeric water-absorbent resin material. In other words, by obtaining the boundaries of each absorption means, they correspond to the feeding areas 121 on the feeding roller 120, and when the feeding roller 120 rotates to feed, the single feeding area 121 accurately feeds the polymer water-absorbing resin material 4 into the corresponding single absorption means. d) The upper nonwoven fabric 2 is unfolded and transported by the second unfolding means 13. An adhesive is applied to the lower surface of the upper nonwoven fabric 2, and the upper nonwoven fabric 2 is bonded to the upper surface a' of the fluffy nonwoven fabric 1. e) The boundaries of each absorbing means in step b are obtained, and the guide groove 6 is press-molded by the uneven roller means 14 in the center of each absorbing means in the vertical direction in the product in step d. f) The product in step e is turned over by 180°, and the positions of the upper surface a' and the lower surface b' of the fluffy nonwoven fabric 1 are exchanged, so that the lower surface b' of the fluffy nonwoven fabric 1 is on top. g) The boundaries of each absorbing means in step b are obtained, and the second supplying means 15 periodically adds the polymer water-absorbing resin material 5 to the continuous absorbing means on the lower surface b' of the fluffy nonwoven fabric 1. The polymer water-absorbing resin material 5 is fitted into the gaps in the fluffy nonwoven fabric 1. h) The lower nonwoven fabric 3 is unfolded and transported by the third unfolding means 16. An adhesive is applied to the lower surface of the lower nonwoven fabric 3, and the lower nonwoven fabric 3 is bonded to the lower surface of the fluffy nonwoven fabric 1. The width dimension in the lateral direction of the lower nonwoven fabric 3 is 8 mm to 25 mm larger than the width dimension of the fluffy nonwoven fabric 1, and preferably 16 mm larger. i) Both lateral sides of the lower nonwoven fabric 3 are folded downward and inward, and attached to the upper surface of the upper nonwoven fabric 2, and then fixed by thermocompression bonding or ultrasonic welding. j) Obtain the boundaries of each absorption means in step b and the position of the guide groove 6 in step e, and perform thermocompression bonding or ultrasonic welding in the vertical central region of the guide groove 6 in the product in step i to fixedly connect the upper nonwoven fabric 2, the fluffy nonwoven fabric 1 and the lower nonwoven fabric 3. 2) Obtain the boundaries of each absorbent means in step b, and perform thermocompression or ultrasonic welding on both vertical sides of the boundaries of the absorbent means in the core layer in step 1 to fix and connect the upper nonwoven fabric 2, fluffy nonwoven fabric 1 and lower nonwoven fabric 3. 3) The boundaries of each absorbent means in step b are obtained, and the boundaries of the absorbent means of the product in step 2 are cut using cutting means 17 to form a single absorbent core main body 10. The absorbency of the absorbent core main body 10 increases stepwise from one end in the longitudinal direction to the other end in the longitudinal direction, and then decreases stepwise again.

[0026] Although the present invention has been specifically described based on preferred embodiments, those skilled in the art will recognize that various changes in form or details may be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. Contains an absorbent core, The absorbent core main body includes an upper nonwoven fabric, a fluffy nonwoven fabric, and a lower nonwoven fabric, with the direction extending along its length defined as the longitudinal direction and the direction extending along its width defined as the transverse direction, respectively; The fluffy nonwoven fabric has a polymeric water-absorbing resin material on each of its upper and lower surfaces, and the polymeric water-absorbing resin material is fitted into the gaps in the fluffy nonwoven fabric, and the density of the polymeric water-absorbing resin material in the fluffy nonwoven fabric decreases stepwise from the center of the fluffy nonwoven fabric in the longitudinal direction to both ends in the longitudinal direction, The upper nonwoven fabric is compounded on the upper surface of the fluffy nonwoven fabric with an adhesive, The lower nonwoven fabric is bonded to the lower surface of the fluffy nonwoven fabric by an adhesive, and the width of the lower nonwoven fabric in the lateral direction is 8 mm to 25 mm larger than the width of the fluffy nonwoven fabric in the lateral direction. Both sides of the lower nonwoven fabric in the lateral direction are folded upward and inward and attached to the upper surface of the upper nonwoven fabric, and the upper nonwoven fabric and the fluffy nonwoven fabric are fixedly connected to each other by thermocompression bonding or ultrasonic welding. The longitudinal ends of the upper nonwoven fabric are fixed to the fluffy nonwoven fabric and the lower nonwoven fabric by heat pressing or ultrasonic welding; The vertical center portion of the absorbent core main body is pressurized to form two guide grooves arranged along the vertical direction, and the vertical center portions of the guide grooves are fixedly connected to the upper nonwoven fabric, the fluffy nonwoven fabric and the lower nonwoven fabric by thermocompression bonding or ultrasonic welding; The quick-absorbing and dry core body is characterized in that the water absorption capacity of the absorbent core main body increases stepwise from one longitudinal end to the other longitudinal end and then decreases stepwise again.

2. 2. The quick-absorbing, dry core according to claim 1, wherein the two guide grooves are formed in an arc shape and are symmetrically distributed about a central axis in the lateral direction of the absorbent core main body.

3. 2. The rapid absorption and drying core according to claim 1, wherein the region located in the guide groove is free of a polymeric water-absorbent resin material.

4. The rapid absorption dry core according to any one of claims 1 to 3, characterized in that the ratio of the longitudinal length of the welded region in the guide groove to the longitudinal length of the guide groove is 0.5 to 0.85:

1.

5. 5. The rapid absorption dry core according to claim 4, wherein the ratio of the longitudinal length of the guide groove to the longitudinal length of the absorbent core main body is 0.6 to 0.8:

1.

6. The width dimension in the lateral direction of the upper-layer nonwoven fabric is 8 mm to 25 mm larger than the width dimension in the lateral direction of the fluffy nonwoven fabric, The rapid absorption and dry core according to claim 4, characterized in that both sides of the upper-layer nonwoven fabric in the lateral direction are folded upward and inward and sandwiched between the folded regions of the lower-layer nonwoven fabric and the upper-layer nonwoven fabric.

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