A high diffusivity absorbent core body production apparatus

Abstract

The utility model relates to one -off sanitary product production equipment field especially, a kind of high diffusivity absorbent core production equipment for producing the absorbent core of fast diffusion speed and high absorption efficiency, including frame, control unit, forming die wheel, first unwinding unit, second unwinding unit, third unwinding unit, first wood pulp fiber blanking unit, second wood pulp fiber blanking unit, first high molecular water-absorbent resin particle blanking unit and second high molecular water-absorbent resin particle blanking unit;The forming die wheel is rotatably arranged on frame, and the circumference of the forming die wheel is provided with a plurality of die cavities, the bottom surface of the die cavity is provided with convex strip, and the forming die wheel includes gas distribution bin, so that a negative pressure adsorption area is formed on the forming die wheel by the gas distribution bin, and when the forming die wheel rotates, part of the die cavities in the negative pressure adsorption area are communicated with the gas distribution bin.

Description

Technical Field

[0001] This utility model relates to the field of disposable hygiene product production equipment, and in particular to a high-diffusivity absorbent core production equipment. Background Technology

[0002] Absorbent cores are widely used in absorbent care products such as diapers and sanitary napkins. Absorbent cores should be able to retain liquid for extended periods, such as during overnight diaper use, minimizing backflow to keep the wearer dry, and preventing soiling of clothes or sheets. Currently, the most widely used absorbent cores on the market consist of two or three layers of non-woven fabric with a superabsorbent polymer (SAP) sandwiched between them. The SAP is spread on the upper surface of one layer of non-woven fabric, and then another layer of non-woven fabric is bonded together with adhesive. This type of absorbent core is relatively thin, but the SAP is difficult to fix, easily causing it to shift or leak. Furthermore, the SAP absorbs water quickly and swells after absorbing liquid, increasing its volume to several times its original size. This means that the SAP at the top, after preferentially absorbing and swelling, can hinder liquid seepage, severely impacting absorbency. Utility Model Content

[0003] Therefore, in view of the above problems, this utility model provides a high-diffusion absorbent core production equipment for producing absorbent cores with fast diffusion speed and high absorption efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-diffusion absorbent core production equipment includes a frame, a control unit, a forming die wheel, a first unwinding unit, a second unwinding unit, a third unwinding unit, a first wood pulp fiber feeding unit, a second wood pulp fiber feeding unit, a first superabsorbent polymer granule feeding unit, and a second superabsorbent polymer granule feeding unit.

[0006] The forming mold wheel is rotatably mounted on the frame. Several mold cavities are provided on the circumferential surface of the forming mold wheel. The bottom surface of the mold cavity is provided with a protruding strip. The forming mold wheel includes a gas distribution chamber. The gas distribution chamber forms a negative pressure adsorption zone on the forming mold wheel. When the forming mold wheel rotates, the part of the mold cavity that enters the negative pressure adsorption zone is connected to the gas distribution chamber.

[0007] The first unwinding unit, the second unwinding unit, the third unwinding unit, the first wood pulp fiber feeding unit, the second wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, and the second superabsorbent polymer granule feeding unit are respectively disposed on the periphery of the forming mold wheel and distributed in the negative pressure adsorption area. The first unwinding unit, the first wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, the second unwinding unit, the second wood pulp fiber feeding unit, the second superabsorbent polymer granule feeding unit, and the third unwinding unit are sequentially distributed along the rotation direction of the forming mold wheel.

[0008] Furthermore, the forming mold wheel also includes a drive motor, a transmission assembly, a rotating shaft, a mold wheel body, several molds, and an airflow adjustment assembly. The rotating shaft is rotatably mounted on the frame. The drive motor is connected to the rotating shaft through the transmission assembly. The mold wheel body is fixed on the rotating shaft. Each mold is evenly arranged around the circumference of the mold wheel body, and each mold has a mold cavity. The air distribution chamber is rotatably mounted on the rotating shaft and distributed within the mold wheel body. The air distribution chamber is provided with an exhaust port for discharging air from the chamber and an intake port for drawing in external air. The airflow adjustment assembly is located at the intake port and is used to adjust the airflow rate at the intake port. The intake port communicates with part of the mold cavity.

[0009] Furthermore, the gas distribution chamber includes a sleeve, two partitions, an arc-shaped baffle, an arc-shaped cover plate, and two side plates. The sleeve is rotatably mounted on a rotating shaft. The two partitions are perpendicularly disposed on the sleeve along the radial direction. The arc-shaped baffle is connected to the two partitions. The two side plates are disposed on the arc-shaped baffle and the partitions and are distributed at both ends of the sleeve along the axial direction. A chamber with an opening is formed by the partitions, the arc-shaped baffle, and the side plates. The arc-shaped cover plate is disposed at the opening of the chamber, and the air intake is disposed on the arc-shaped cover plate.

[0010] Furthermore, the air volume adjustment assembly includes a fixed seat on the side plate, a movable seat slidably disposed on the fixed seat, and an adjustment seat locked on the movable seat. The fixed seat is provided with a strip groove, and the movable seat is provided with a threaded hole. The fixed seat and the movable seat are locked together by locking bolts passing through the strip groove and the threaded hole.

[0011] Furthermore, a groove is recessed on the bottom surface of the mold cavity, so that the bottom surface of the mold cavity forms a stepped structure. The bottom surface of the mold cavity has a first support surface, a second support surface, and a connecting surface connecting the first support surface and the second support surface.

[0012] Furthermore, the connecting surface is provided with a first adsorption hole, which is connected to the negative pressure adsorption zone.

[0013] Furthermore, the connecting surfaces are inclined, and the inclination angle of the connecting surfaces is 15° to 89°.

[0014] Furthermore, both the first and second superabsorbent polymer (SAP) granule feeding units include a storage bin and a feeding roller. The circumferential surface of the feeding roller is provided with a storage trough for storing SAP granules, and the circumferential surface of the feeding roller is provided with a support platform that cooperates with the protrusion.

[0015] Furthermore, the side of the protrusion is provided with a second adsorption hole, which is connected to the negative pressure adsorption zone.

[0016] A high-diffusion absorbent core production equipment includes a frame, a control unit, a forming die wheel, a first unwinding unit, a second unwinding unit, a third unwinding unit, a first wood pulp fiber feeding unit, a second wood pulp fiber feeding unit, a first superabsorbent polymer granule feeding unit, and a second superabsorbent polymer granule feeding unit.

[0017] The forming mold wheel is rotatably mounted on the frame. Several mold cavities are provided on the circumferential surface of the forming mold wheel. The bottom surface of the mold cavity is provided with a protruding strip. The forming mold wheel includes a gas distribution chamber. The gas distribution chamber forms a negative pressure adsorption zone on the forming mold wheel. When the forming mold wheel rotates, the part of the mold cavity that enters the negative pressure adsorption zone is connected to the gas distribution chamber.

[0018] The first unwinding unit, the second unwinding unit, the third unwinding unit, the first wood pulp fiber feeding unit, the second wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, and the second superabsorbent polymer granule feeding unit are respectively disposed on the periphery of the forming mold wheel and distributed in the negative pressure adsorption area. The first unwinding unit, the first wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, the second unwinding unit, the second superabsorbent polymer granule feeding unit, the second wood pulp fiber feeding unit, and the third unwinding unit are sequentially distributed along the rotation direction of the forming mold wheel.

[0019] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This high-diffusivity absorbent core production equipment, through the first unwinding unit, the first wood pulp fiber feeding unit, the first superabsorbent polymer particle feeding unit, the second unwinding unit, the second wood pulp fiber feeding unit, the second superabsorbent polymer particle feeding unit, and the third unwinding unit, are arranged around the negative pressure adsorption area of ​​the forming mold wheel, and are sequentially distributed along the rotation direction of the forming mold wheel, making the structure of the production equipment compact, reducing the space occupied by the equipment, and improving the production efficiency of the core body. Furthermore, the prepared core body, through the setting of wood pulp fiber and the fixing of superabsorbent polymer particles with adhesive spraying, fixes the superabsorbent polymer particles, preventing deviation or leakage. At the same time, the guide groove formed by the core body can accelerate the flow and infiltration speed of the liquid, improving the water absorption efficiency of the prepared core body. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of the gas distribution chamber in Embodiment 1 of this utility model;

[0022] Figure 3 This is a schematic diagram of the mold structure in the unfolded state of the forming mold wheel in the first embodiment of this utility model;

[0023] Figure 4 This is a circuit module diagram of Embodiment 1 of this utility model;

[0024] Figure 5 This is a schematic diagram of the mold structure in the unfolded state of the forming mold wheel in the second structure of Embodiment 1 of this utility model;

[0025] Figure 6 This is a three-dimensional structural diagram of the mold with the second structure in Embodiment 1 of this utility model;

[0026] Figure 7 This is a three-dimensional structural diagram of the feeding roller in Embodiment 1 of this utility model;

[0027] Figure 8 This is a top view of the core body of the first structure in Embodiment 1 of this utility model;

[0028] Figure 9 yes Figure 8 Schematic diagram of the cross-sectional structure at point AA;

[0029] Figure 10 This is a cross-sectional view of the core body of the second structure in Embodiment 1 of this utility model;

[0030] Figure 11 yes Figure 10 Schematic diagram of the cross-sectional structure at point BB;

[0031] Figure 12 This is a top view of the core body structure of the third type in Embodiment 1 of this utility model;

[0032] Figure 13 This is a schematic diagram of the detection instrument in Embodiment 1 of this utility model;

[0033] Figure 14 This is a top view of the water guide plate of the detection instrument in Embodiment 1 of this utility model;

[0034] Figure 15 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0035] Figure 16 This is a cross-sectional view of the core body structure of the second type in Embodiment 2 of this utility model. Detailed Implementation

[0036] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0037] The embodiment of this utility model is as follows:

[0038] Example 1:

[0039] refer to Figures 1 to 4 As shown, a high-diffusion absorbent core production equipment includes a frame, a control unit 51, a forming die wheel 52, a first unwinding unit 53, a second unwinding unit 56, a third unwinding unit 59, a first wood pulp fiber feeding unit 54, a second wood pulp fiber feeding unit 57, a first superabsorbent polymer granule feeding unit 55, a second superabsorbent polymer granule feeding unit 58, and a slitting unit.

[0040] The forming mold wheel 52 is rotatably mounted on the frame. A plurality of mold cavities 521 are provided on the circumferential surface of the forming mold wheel 52. The bottom surface of the mold cavity 521 is provided with a protruding strip 522. The forming mold wheel 52 includes a gas distribution chamber 523. The gas distribution chamber 523 forms a negative pressure adsorption zone 524 on the forming mold wheel 52. When the forming mold wheel 52 rotates, the part of the mold cavity 521 that enters the negative pressure adsorption zone 524 communicates with the gas distribution chamber 523.

[0041] The first unwinding unit 53, the second unwinding unit 56, the third unwinding unit 59, the first wood pulp fiber feeding unit 54, the second wood pulp fiber feeding unit 57, the first superabsorbent polymer granule feeding unit 55, and the second superabsorbent polymer granule feeding unit 58 are respectively disposed on the periphery of the forming mold wheel 52 and distributed in the negative pressure adsorption area 524. The first unwinding unit 53, the first wood pulp fiber feeding unit 54, the first superabsorbent polymer granule feeding unit 55, the second unwinding unit 56, the second wood pulp fiber feeding unit 57, the second superabsorbent polymer granule feeding unit 58, and the third unwinding unit 59 are sequentially distributed along the rotation direction of the forming mold wheel 52. The slitting unit is disposed at the output end of the forming mold wheel 52 and the third unwinding unit 59.

[0042] The first unwinding unit 53, the second unwinding unit 56, the third unwinding unit 59, the first wood pulp fiber feeding unit 54, the second wood pulp fiber feeding unit 57, the first superabsorbent polymer granule feeding unit 55, the second superabsorbent polymer granule feeding unit 58, and the forming die wheel 52 are all electrically connected to the control unit 51.

[0043] The production process of the aforementioned production equipment is as follows:

[0044] a. The top layer 11 is unwound and conveyed by the first unwinding unit 53, and the upper surface of the top layer 11 is coated with adhesive. The top layer 11 is conveyed to the forming mold wheel 52. A plurality of mold cavities 521 are provided around the circumference of the forming mold wheel 52. The bottom surface of the mold cavity 521 is provided with a protruding strip 522. The top layer 11 is adsorbed into the mold cavity 521 of the forming mold wheel 52. The direction of conveying the top layer 11 is defined as the longitudinal direction, and the direction of the width of the top layer 11 is defined as the transverse direction.

[0045] b. The first unwinding unit 53 is connected to the control unit 51. The control unit 51 obtains the start time and unwinding speed of the first unwinding unit 53. By determining the longitudinal length dimension of a single core body 1, the time taken by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of a single core body 1 is determined. The time taken by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of a single core body 1 is defined as the unloading time.

[0046] c. Obtain the unloading time in step b. Determine the rotation speed of the forming mold wheel 52 by ensuring that the longitudinal length dimension of the mold cavity 521 is equal to the longitudinal length dimension of the single core body 1. Also, determine the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent mold cavities 521. Define the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent mold cavities 521 as the stopping time.

[0047] d. Obtain the feeding time in step b and the stopping time in step c, and intermittently add wood pulp fibers into the mold cavity 521 of the forming mold wheel 52 through the first wood pulp fiber feeding unit 54 to form the first wood pulp fiber layer 22.

[0048] e. Obtain the feeding time in step b and the stopping time in step c, and intermittently add superabsorbent polymer particles into the mold cavity 521 of the molding die wheel 52 through the first superabsorbent polymer particle feeding unit 55 to form the first superabsorbent polymer particle layer 21. No wood pulp fiber and superabsorbent polymer particles are applied at the position corresponding to the protrusion 522.

[0049] f. The intermediate layer 13 is unwound and conveyed through the second unwinding unit 56, and the lower surface of the intermediate layer 13 is glued. Then the intermediate layer 13 is covered on the product of step e, and the top layer 11 and the intermediate layer 13 are bonded together at the protrusion 522.

[0050] g. Apply adhesive to the upper surface of the intermediate layer 13 in step f;

[0051] h. Obtain the feeding time in step b and the stopping time in step c, and intermittently add wood pulp fibers into the mold cavity 521 of the forming mold wheel 52 through the second wood pulp fiber feeding unit 57 to form the second wood pulp fiber layer 32.

[0052] i. Obtain the feeding time in step b and the stop time in step c, and intermittently add superabsorbent polymer particles into the mold cavity 521 of the molding die wheel 52 through the second superabsorbent polymer particle feeding unit 58 to form the second superabsorbent polymer particle layer 31. No wood pulp fiber and superabsorbent polymer particles are applied at the position corresponding to the protrusion 522.

[0053] j. The bottom layer 12 is unwound and conveyed through the third unwinding unit 59, and the lower surface of the bottom layer 12 is glued. Then the bottom layer 12 is covered on the product of step i, and the middle layer 13 and the bottom layer 12 are bonded together at the protrusion 522.

[0054] k. Obtain the feeding time in step b and the stopping time in step c, and cut the product along the area corresponding to the stopping time of step j using the cutting unit to form a single core body 1.

[0055] Furthermore, the longitudinal length of the core body 1 is 5cm to 80cm, preferably 30cm, and the average basis weight of the superabsorbent polymer particles is 0.1g / m³. 2 ~20g / m 2 The preferred value is 6g / m 2 .

[0056] This high-diffusivity absorbent core production equipment comprises a first unwinding unit 53, a first wood pulp fiber feeding unit 54, a first superabsorbent polymer granule feeding unit 55, a second unwinding unit 56, a second wood pulp fiber feeding unit 57, a second superabsorbent polymer granule feeding unit 58, and a third unwinding unit 59, all located around the negative pressure adsorption area 524 of the forming mold wheel 52 and arranged sequentially along the rotation direction of the forming mold wheel 52. This arrangement results in a compact structure, reduces the space occupied by the equipment, and improves the production efficiency of the core body 1. Specifically, the start-up time and unwinding speed of the first unwinding unit 53 are obtained through the control unit 51. By determining the longitudinal length dimension of a single core body 1, the time taken for the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of a single core body 1 is determined. Furthermore, the rotation speed of the forming mold wheel 52 is determined, as well as the time taken for the first unwinding unit 53 to unwind the top layer of the spacing dimension between two adjacent mold cavities 521 is also determined. The first unwinding unit 53, the second unwinding unit 56, and the third unwinding unit 59 are matched with the conveying speed of the forming mold wheel 52, and the first wood pulp fiber feeding unit 54, the second wood pulp fiber feeding unit 57, the first superabsorbent polymer (SAP) granule feeding unit 55, and the second SAP granule feeding unit 58 are precisely positioned with the mold cavity 521 of the forming mold wheel 52, achieving intermittent material application. This improves the precise feeding of wood pulp fiber and SAP granules, ensures the uniformity of application of wood pulp fiber and SAP granules, and improves the quality of the formed core body 1. Furthermore, the positioning method described above improves the production efficiency of the core body 1. Moreover, the prepared core body 1, through the setting of wood pulp fiber and the fixation of SAP granules by spraying adhesive, fixes the SAP granules, preventing deviation or leakage. At the same time, the guide groove formed by the core body 1 can accelerate the flow and seepage speed of the liquid, improving the water absorption efficiency of the prepared core body 1.

[0057] Specifically, the forming mold wheel 52 further includes a drive motor 525, a transmission assembly, a rotating shaft 526, a mold wheel body 527, several molds 528, and an airflow regulating assembly 529. The rotating shaft 526 is rotatably mounted on the frame. The drive motor 525 is connected to the rotating shaft 526 via the transmission assembly. The mold wheel body 527 is fixed on the rotating shaft 526. Each mold 528 is evenly arranged around the circumference of the mold wheel body 527, and each mold 528 has a mold cavity 521. The air distribution chamber 523 can... Rotatably mounted on the rotating shaft 526 and distributed within the mold wheel body 527, the air distribution chamber 523 is provided with an exhaust port 301 for discharging air from the air distribution chamber 523 and an intake port 302 for drawing in external air. The airflow regulating component 529 is located at the intake port 302 and is used to regulate the airflow rate of the intake port 302. The intake port 302 communicates with part of the mold cavity 521. The air distribution chamber 523 includes a sleeve 303, two partition plates 304, an arc-shaped baffle 305, and an arc... The sleeve 303 is rotatably mounted on a rotating shaft 526, with a cover plate 306 and two side plates 307. Two partition plates 304 are perpendicularly disposed on the sleeve 303 along its radial direction. An arc-shaped baffle 305 is connected to the two partition plates 304. Two side plates 307 are disposed on the arc-shaped baffle 305 and the partition plates 304, and distributed at both axial ends of the sleeve 303. The partition plates 304, arc-shaped baffle 305, and side plates 307 form an open chamber 308, which is covered by the arc-shaped cover plate 306. At the opening of chamber 308, the air intake 302 is located on the arc-shaped cover plate 306. The air volume adjustment assembly 529 includes a fixed seat 401 located on the side plate 307, a movable seat 402 slidably located on the fixed seat 401, and an adjustment seat 403 locked to the movable seat 402. The fixed seat 401 is provided with a strip groove 404, and the movable seat 402 is provided with a threaded hole 405. The fixed seat 401 and the movable seat 402 are locked together by locking bolts passing through the strip groove 404 and the threaded hole 405.

[0058] The drive motor 525 drives the rotating shaft 526 to rotate through the transmission assembly, thereby causing the mold wheel body 527 on the rotating shaft 526 to rotate. The mold 528 on the mold wheel body 527 rotates accordingly. The top layer 11, bottom layer 12, middle layer 13 and other material layers are unwound and rolled into the negative pressure adsorption zone 524 of the forming mold wheel 52 to achieve adsorption and bonding. The rotation of the forming mold wheel 52 realizes the conveying of the material layers. At the same time, the wood pulp fiber and superabsorbent polymer particles are adsorbed onto the material layers and fixed to prevent leakage and improve production stability. Furthermore, the air volume adjustment component 529 is set at the air intake 302 to adjust the air flow of the air intake 302, so that the adsorption force of the mold cavity 521 in the negative pressure adsorption zone 524 can be adjusted, improving the convenience of use.

[0059] In this embodiment, reference Figure 5 , Figure 6 and Figure 7 As shown, a groove 501 is recessed on the bottom surface of the mold cavity 521, forming a stepped structure. The bottom surface of the mold cavity 521 has a first support surface 502, a second support surface 503, and a connecting surface 504 connecting the first support surface 502 and the second support surface 503. A first adsorption hole 505 is provided on the connecting surface 504, which communicates with the negative pressure adsorption area 524. The connecting surface 504 is inclined, and the inclination angle of the connecting surface 504 is 15° to 89°. The selected angle is 70°. The side of the protrusion 522 is provided with a second adsorption hole 506, which communicates with the negative pressure adsorption zone 524. Both the first superabsorbent polymer particle feeding unit 55 and the second superabsorbent polymer particle feeding unit 58 include a storage bin 581 and a feeding roller 582. The circumferential surface of the feeding roller 582 is provided with a storage trough 583 for storing superabsorbent polymer particles. The circumferential surface of the feeding roller 582 is provided with a support platform 584 that cooperates with the protrusion 522 for preparing the superabsorbent polymer particles. Figure 10 and Figure 11 The absorbent core shown has a first adsorption hole 505 and a second adsorption hole 506, which allows the wood pulp fibers to adhere to the material layer on the sidewall of the connecting surface 504 and the protrusion 522 when the wood pulp fibers are fed, thereby forming a sidewall made only of wood pulp fibers, increasing the permeability and improving the flow conduction effect of the core body 1.

[0060] In this embodiment, reference Figure 8 and Figure 9 As shown, a highly diffusive absorbent core includes a core body 1. The core body 1 is defined to have a longitudinal direction extending along its length and a transverse direction extending along its width. The longitudinal length of the core body 1 is 5cm to 80cm, preferably 30cm. The core body 1 has a front waist area 101, a rear waist area 102, and a crotch area 103 distributed sequentially along the longitudinal direction. The core body 1 has a first absorbent area 100 located on one side of the transverse central axis a and a second absorbent area 200 located on the other side of the transverse central axis a. The core body 1 includes a top layer 11, a bottom layer 12, and an intermediate layer 13 distributed between the top layer 11 and the bottom layer 12. The basis weight of the top layer 11, the bottom layer 12, and the intermediate layer 13 is 5gsm to 30gsm.

[0061] A first absorbent material layer is provided between the top layer 11 and the middle layer 13, the first absorbent material layer comprising a first absorbent material. A second absorbent material layer is provided between the middle layer 13 and the bottom layer 12, the second absorbent material layer comprising a second absorbent material. Both the first and second absorbent material layers have front and rear edges distributed at both ends in the longitudinal direction and left and right edges distributed at both ends in the transverse direction. The first absorbent material comprises a first superabsorbent polymer granule layer 21 and a first wood pulp fiber layer 22, the first wood pulp fiber layer 22 being close to the top layer 11. The second absorbent material comprises a second superabsorbent polymer granule layer 31 and a second wood pulp fiber layer 32, the second wood pulp fiber layer 32 being close to the bottom layer 12. The average basis weight of both the first superabsorbent polymer granule layer 21 and the second superabsorbent polymer granule layer 31 is 0.1 g / m³. 2 ~20g / m 2 The preferred value is 6g / m 2 The first absorption area 100 of the first absorbent material layer is provided with at least one first slit 4 without the first absorbent material along the longitudinal direction, preferably one slit. The second absorption area 200 of the first absorbent material layer is provided with at least one second slit 5 without the first absorbent material along the longitudinal direction, preferably one slit. The first slit 4 and the second slit 5 are symmetrically distributed along the transverse central axis a of the core body 1.

[0062] The top layer 11 and the middle layer 13 are connected at the first slit 4 and the second slit 5. When the first absorbent material swells, a first flow channel 6 is formed at the first slit 4 of the first absorbent region 100 and the second slit 5 of the second absorbent region 200.

[0063] In this embodiment, the top layer 11, bottom layer 12, and intermediate layer 13 are all permeable nonwoven fabrics, but can also be, for example, thin sheets of paper (breathable felt or wet-laid web), having a basis weight ranging from, for example, 5 to 100 gsm, specifically 10 to 40 gsm. The top layer 11, bottom layer 12, and intermediate layer 13 can also be formed from low-basis-weight nonwoven fiber webs having a basis weight between 5 gsm and 30 gsm, such as carded nonwoven fabrics, spunbond nonwoven fabrics, or meltblown nonwoven fabrics, and any laminates of these fiber webs. For example, melt-spun polypropylene nonwoven fabrics, having a basis weight range of about 5 gsm to 20 gsm. Nonwoven materials are generally inherently hydrophobic, and the top layer 11 can therefore be treated to make it hydrophilic, for example, by treating it with surfactants or other methods known in the art. The top layer 11, the bottom layer 12, and the intermediate layer 13 may be made of the same or different materials, optionally with the top layer 11 and the bottom layer 12 treated differently to make the top layer 11 more hydrophilic than the bottom layer 12, or paper, tissue paper, film, fabric, or a laminate of any of these may also be used.

[0064] This highly diffusive absorbent core increases the absorption capacity of the core body 1 through a first absorbent material layer containing a first absorbent material between the top layer 11 and the middle layer 13, and a second absorbent material layer containing a second absorbent material between the bottom layer 12 and the middle layer 13. Simultaneously, the middle layer 13 isolates the first and second absorbent materials. The first absorbent material includes a first superabsorbent polymer granule layer 21 and a first wood pulp fiber layer 22, with the first wood pulp fiber layer 22 located close to the top layer 11. The second absorbent material includes a second superabsorbent polymer granule layer 31 and a second wood pulp fiber layer 32, with the second wood pulp fiber layer 32 located close to the bottom layer 12. This allows the wood pulp fibers to increase the softness of the top or bottom layer after bonding with the top or bottom layer 11, while maintaining thickness and bulkiness. After adding the first superabsorbent polymer granule layer 21 or the second superabsorbent polymer granule layer 31, the superabsorbent polymer granules are embedded in the gaps between the wood pulp fibers and fixed to the top layer by the wood pulp fibers. Alternatively, the bottom layer can constrain the superabsorbent polymer (SAP) particles, fixing them and providing sufficient expansion space to ensure their absorption capacity. Furthermore, by providing first slits 4 and 5 (without SAP) at intervals between the first absorption area 100 and the second absorption area 200 of the first absorbent material layer, and by connecting the top layer 11 and the middle layer 13 at the first slits 4 and 5, the SAP particles are encapsulated, preventing excessive leakage. During use, the liquid is absorbed by the first absorbent material, and the SAP particles swell, forming first flow channels 6 at the first slits 4 and 5. A portion of the excess liquid seeps through the middle layer 13 to the second absorbent material and is absorbed, while the other portion flows along the first flow channels 6, resulting in good flow guidance and thus improving the diffusion and absorption efficiency of the core body 1.

[0065] Furthermore, the first absorption area 100 of the second absorbent material layer is provided with at least one third slit 7 without the second absorbent material along the longitudinal direction, preferably one slit. The second absorption area 200 of the second absorbent material layer is provided with at least one fourth slit 8 without the second absorbent material along the longitudinal direction, preferably one slit. The bottom layer 12 and the intermediate layer 13 are compositely connected at the third slit 7 and the fourth slit 8. When the second absorbent material swells, a second flow channel 9 is formed at the third slit 7 of the first absorption area 100 and the fourth slit 8 of the second absorption area 200. The orthographic projection of the first flow channel 6 and the second flow channel 9 coincides.

[0066] During use, the liquid is absorbed by the first absorbent material. The superabsorbent polymer particles in the first absorbent material swell upon absorbing the liquid, forming a first flow channel 6 at the first slit 4 and the second slit 5. A portion of the excess liquid seeps down through the intermediate layer 13 to the second absorbent material and is absorbed. The superabsorbent polymer particles in the second absorbent material swell upon absorbing the liquid, forming a second flow channel 9 at the third slit 7 and the fourth slit 8. The remaining liquid flows along the second flow channel 9, and the flow guidance effect is good, further improving the diffusion and absorption efficiency of the core body 1.

[0067] refer to Figure 10 and Figure 11 As shown, the longitudinal length of the first absorbent material layer is smaller than that of the second absorbent material layer. The first absorbent material layer is distributed in the front waist area 101 and the crotch area 103. The rear end of the first guide channel 6 is connected to the rear edge, so that the liquid flowing in the first guide channel 6 can overflow into the second absorbent material layer through the rear end, thereby increasing the absorption speed. At the same time, by setting the distribution of the first absorbent material layer in the front waist area 101 and the crotch area 103 according to the actual use area, the amount of first absorbent material used can be reduced, and the change in the absorption amount can be kept small, thereby improving the utilization rate of the first absorbent material and reducing production costs.

[0068] The above discloses that the rear end of the first flow channel 6 is connected to the rear edge. Of course, it can also be set such that the front end of the first flow channel 6 is connected to the front edge.

[0069] refer to Figure 12 As shown, the number of the first slit 4, second slit 5, third slit 7, and fourth slit 8 is one. Alternatively, the first absorption area 100 of the first absorbent material layer may have two or more first slits 4 without the first absorbent material along the longitudinal direction; the second absorption area 200 of the first absorbent material layer may have two or more second slits 5 without the first absorbent material along the longitudinal direction; the first absorption area 100 of the second absorbent material layer may have two or more third slits 7 without the second absorbent material along the longitudinal direction; and the second absorption area 200 of the second absorbent material layer may have two or more fourth slits 8 without the second absorbent material along the longitudinal direction. For example, the number of the first slit 4, second slit 5, third slit 7, and fourth slit 8 may all be four, and they may be spaced apart along the longitudinal direction. This allows the first flow channel 6 and the second flow channel 9 to function as flow channels, while further limiting the movement of the superabsorbent polymer particles, improving the uniformity of the core body, and ensuring the flow channeling function of the core body 1.

[0070] Furthermore, the first and second absorbent material layers of the core body 1 have a pressure absorption capacity of not less than 8.4 g / g when measured under a pressure of 4.136 kPa, that is, the wood pulp fiber and superabsorbent polymer particles of the core body 1 have a pressure absorption capacity of not less than 8.4 g / g when measured under a pressure of 4.136 kPa, preferably 8.4 g / g, 8.6 g / g, 8.7 g / g, or even higher; the first and second absorbent material layers of the core body 1 have a water absorption rate of not more than 10 s when measured under a pressure of 4.136 kPa, that is, the wood pulp fiber and superabsorbent polymer particles of the core body 1 have a water absorption rate of not more than 10 s when measured under a pressure of 4.136 kPa, preferably 10 s, 9 s, 8 s, or even less.

[0071] refer to Figure 13 and Figure 14 As shown, the detection method is:

[0072] I. Prepare the instruments:

[0073] Press block 201: The mass of the press block 201 is 0.4136KG, the bottom surface of the press block 201 is a circular structure, and electrodes are provided inside the press block 201;

[0074] Plastic cylinder 202: The area of ​​the plastic cylinder 202 is 1000.0 mm². 2 ±0.5mm 2 The height of the plastic cylinder 202 is 60.0mm ± 0.5mm, and a nylon mesh with a pore size of 36μm is attached to the bottom of the plastic cylinder 202.

[0075] Metal frame 203: The metal frame 203 has a filter screen;

[0076] Timer 218;

[0077] Water guide plate 204: The water guide plate 204 has a through hole 205 in the middle, and a water pipe connector 206 is connected to the through hole 205. Six water guide grooves 207 are recessed along the radial direction on the upper surface of the water guide plate 204; Pumping system: The pumping system includes a water pump 208 and a water pipe 209 connected to the water pump 208.

[0078] Water tank 210: The water tank 210 has a water storage cavity 211. The upper surface of the water tank 210 is provided with a baffle 213 in a ring structure. A water guiding cavity 212 is formed between the baffle 213 and the water tank 210. The upper surface of the water tank 210 is provided with a water outlet 214 and an overflow hole 215 that connect the water storage cavity 211 and the water guiding cavity 212.

[0079] 216 brackets;

[0080] Lifting assembly 217;

[0081] Balance scales;

[0082] The water pump 208 is located in the water storage chamber 211. The bracket 216 is horizontally mounted on the baffle 213. The metal frame 203 is located on the bracket 216 and is used to place the plastic cylinder 202. The lifting assembly 217 is located on the water guiding chamber 212. The water guiding plate 204 is located at the upper end of the lifting assembly 217 and distributed on the lower side of the metal frame 203. The water pipe 209 passes through the water outlet 214 and is connected to the water pipe connector 206 of the water guiding plate 204. The timer 218 is connected to the electrode of the pressure block 201 and the metal frame 203 through the wire 219.

[0083] II. Testing Steps:

[0084] a. The test shall be conducted under standard atmospheric pressure.

[0085] b. Weigh 9.0g of sodium chloride into a beaker, dissolve it, transfer it to a 1L volumetric flask, dilute it with water to the mark and shake well to prepare a 0.9% physiological saline solution. Inject the physiological saline solution into the water storage chamber 211 of the water tank 210.

[0086] c. Prepare 5 core bodies with an area of ​​(50±0.2)mm*(80±0.2)mm as samples. Carefully extract wood pulp fibers and superabsorbent polymer particles from the core body 1, for example by careful shaking or suction. The top layer 11, bottom layer 12 and middle layer 13 can be separated from each other by using a cryo-spraying agent before peeling off the wood pulp fibers and superabsorbent polymer particles. The samples should be kept at 21℃±2℃ and 50%±20%RH for at least 24 hours to reach equilibrium.

[0087] d. Place the wood pulp fibers and superabsorbent polymer particles stripped from a single sample into a plastic cylinder 202 and compact them to form a block-shaped sample. Weigh the dried sample using a balance and record it as the dry weight m1.

[0088] e. Place the plastic cylinder 202 connected to the sample on the metal frame 203, and weigh the dried sample and the dried test module (plastic cylinder 202 and metal frame 203) with a balance, and record it as the dry weight m2.

[0089] f. Gently place the pressure block 201 on the top of the sample and let it stand for 30 seconds. Then, lift the water guide plate 204 using the lifting assembly 217 so that the water guide plate 204 abuts against the metal frame 203.

[0090] g. Start the water pump system and inject physiological saline into the plastic cylinder 202. When the surface of the physiological saline comes into contact with the filter screen of the metal frame 203, the timer 218 starts. After the physiological saline completely soaks the sample, the electrode built into the pressure block 201 is turned on and the timer 218 stops. At this time, the reading of the timer 218 is the water absorption rate of the sample.

[0091] h. After the water absorption time measurement is completed, the water pumping system continues to pump water for 10 seconds, then the water pump 208 is turned off, the water level drops, and the saline liquid level drops below the filter screen of the metal frame 203. The wetted sample begins to drain under the action of the pressure block 201. After draining for 30 seconds, the pressure block 201 is removed, and the wetted sample and test module are measured with a balance and recorded as wet weight m3.

[0092] i. Take another set of dry test modules and repeat steps d, e, f, g, and h. Use a balance to measure the wet test modules and record the wet weight as m4.

[0093] j. Calculate the pressure absorption capacity of the sample, K = ((m3-m2)-(m4-(m2-m1))) / m1;

[0094] k. Repeat the above steps five times and take the average value.

[0095] Example 2:

[0096] refer to Figure 15 and Figure 16 As shown, a high-diffusion absorbent core production equipment includes a frame, a control unit 51, a forming die wheel 52, a first unwinding unit 53, a second unwinding unit 56, a third unwinding unit 59, a first wood pulp fiber feeding unit 54, a second wood pulp fiber feeding unit 57, a first superabsorbent polymer granule feeding unit 55, a second superabsorbent polymer granule feeding unit 58, and a slitting unit.

[0097] The forming mold wheel 52 is rotatably mounted on the frame. A plurality of mold cavities 521 are provided on the circumferential surface of the forming mold wheel 52. The bottom surface of the mold cavity 521 is provided with a protruding strip 522. The forming mold wheel 52 includes a gas distribution chamber 523. The gas distribution chamber 523 forms a negative pressure adsorption zone 524 on the forming mold wheel 52. When the forming mold wheel 52 rotates, the part of the mold cavity 521 that enters the negative pressure adsorption zone 524 communicates with the gas distribution chamber 523.

[0098] The first unwinding unit 53, the second unwinding unit 56, the third unwinding unit 59, the first wood pulp fiber feeding unit 54, the second wood pulp fiber feeding unit 57, the first superabsorbent polymer granule feeding unit 55, and the second superabsorbent polymer granule feeding unit 58 are respectively disposed on the periphery of the forming mold wheel 52 and distributed in the negative pressure adsorption area 524. The first unwinding unit 53, the first wood pulp fiber feeding unit 54, the first superabsorbent polymer granule feeding unit 55, the second unwinding unit 56, the second superabsorbent polymer granule feeding unit 58, the second wood pulp fiber feeding unit 57, and the third unwinding unit 59 are sequentially distributed along the rotation direction of the forming mold wheel 52. The slitting unit is disposed at the output end of the forming mold wheel 52 and the third unwinding unit 59.

[0099] The first unwinding unit 53, the second unwinding unit 56, the third unwinding unit 59, the first wood pulp fiber feeding unit 54, the second wood pulp fiber feeding unit 57, the first superabsorbent polymer granule feeding unit 55, the second superabsorbent polymer granule feeding unit 58, and the forming die wheel 52 are all electrically connected to the control unit 51.

[0100] The production process of the aforementioned production equipment is as follows:

[0101] a. The top layer 11 is unwound and conveyed by the first unwinding unit 53, and the upper surface of the top layer 11 is coated with adhesive. The top layer 11 is conveyed to the forming mold wheel 52. A plurality of mold cavities 521 are provided around the circumference of the forming mold wheel 52. The bottom surface of the mold cavity 521 is provided with a protruding strip 522. The top layer 11 is adsorbed into the mold cavity 521 of the forming mold wheel 52. The direction of conveying the top layer 11 is defined as the longitudinal direction, and the direction of the width of the top layer 11 is defined as the transverse direction.

[0102] b. The first unwinding unit 53 is connected to the control unit 51. The control unit 51 obtains the start time and unwinding speed of the first unwinding unit 53. By determining the longitudinal length dimension of a single core body 1, the time taken by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of a single core body 1 is determined. The time taken by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of a single core body 1 is defined as the unloading time.

[0103] c. Obtain the unloading time in step b. Determine the rotation speed of the forming mold wheel 52 by ensuring that the longitudinal length dimension of the mold cavity 521 is equal to the longitudinal length dimension of the single core body 1. Also, determine the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent mold cavities 521. Define the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent mold cavities 521 as the stopping time.

[0104] d. Obtain the feeding time in step b and the stopping time in step c, and intermittently add wood pulp fibers into the mold cavity 521 of the forming mold wheel 52 through the first wood pulp fiber feeding unit 54 to form the first wood pulp fiber layer 22.

[0105] e. Obtain the feeding time in step b and the stopping time in step c, and intermittently add superabsorbent polymer particles into the mold cavity 521 of the molding die wheel 52 through the first superabsorbent polymer particle feeding unit 55 to form the first superabsorbent polymer particle layer 21. No wood pulp fiber and superabsorbent polymer particles are applied at the position corresponding to the protrusion 522.

[0106] f. The intermediate layer 13 is unwound and conveyed through the second unwinding unit 56, and the lower surface of the intermediate layer 13 is glued. Then the intermediate layer 13 is covered on the product of step e, and the top layer 11 and the intermediate layer 13 are bonded together at the protrusion 522.

[0107] g. Apply adhesive to the upper surface of the intermediate layer 13 in step f;

[0108] h. Obtain the feeding time in step b and the stopping time in step c, and intermittently add superabsorbent polymer particles into the mold cavity 521 of the molding die wheel 52 through the second superabsorbent polymer particle feeding unit 58 to form the second superabsorbent polymer particle layer 31.

[0109] i. Obtain the feeding time in step b and the stopping time in step c, and intermittently add wood pulp fibers to the mold cavity 521 of the forming mold wheel 52 through the second wood pulp fiber feeding unit 57 to form the second wood pulp fiber layer 32. No wood pulp fibers and superabsorbent polymer particles are applied at the position corresponding to the convex strip 522.

[0110] j. The bottom layer 12 is unwound and conveyed through the third unwinding unit 59, and the lower surface of the bottom layer 12 is glued. Then the bottom layer 12 is covered on the product of step i, and the middle layer 13 and the bottom layer 12 are bonded together at the protrusion 522.

[0111] k. Obtain the feeding time in step b and the stopping time in step c, and cut the product along the area corresponding to the stopping time of step j using the cutting unit to form a single core body 1.

[0112] The above embodiments disclose that the first wood pulp fiber layer 22 is close to the top layer 11, and the second wood pulp fiber layer 32 is close to the bottom layer 12. Alternatively, the first wood pulp fiber layer 22 can be close to the top layer 11, and the second wood pulp fiber layer 32 can be close to the intermediate layer 13. This design separates the first superabsorbent polymer (SAP) particle layer 21 and the second SAP particle layer 31 through the intermediate layer 13 and the second wood pulp fiber layer 32, increasing the expansion space of both layers and allowing the second wood pulp fiber layer 32 to form a lateral flow guiding effect, further improving the utilization rate of the SAP particles. Alternatively, the first wood pulp fiber layer 22 can be close to the intermediate layer 13, and the second wood pulp fiber layer 32 can be close to the bottom layer 12. Or, both the first wood pulp fiber layer 22 and the second wood pulp fiber layer 32 can be close to the intermediate layer 13.

[0113] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A high-diffusivity absorber core production equipment, characterized in that: It includes a frame, a control unit, a forming die wheel, a first unwinding unit, a second unwinding unit, a third unwinding unit, a first wood pulp fiber feeding unit, a second wood pulp fiber feeding unit, a first superabsorbent polymer granule feeding unit, and a second superabsorbent polymer granule feeding unit. The forming mold wheel is rotatably mounted on the frame. Several mold cavities are provided on the circumferential surface of the forming mold wheel. The bottom surface of the mold cavity is provided with a protruding strip. The forming mold wheel includes a gas distribution chamber. The gas distribution chamber forms a negative pressure adsorption zone on the forming mold wheel. When the forming mold wheel rotates, the part of the mold cavity that enters the negative pressure adsorption zone is connected to the gas distribution chamber. The first unwinding unit, the second unwinding unit, the third unwinding unit, the first wood pulp fiber feeding unit, the second wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, and the second superabsorbent polymer granule feeding unit are respectively disposed on the periphery of the forming mold wheel and distributed in the negative pressure adsorption area. The first unwinding unit, the first wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, the second unwinding unit, the second wood pulp fiber feeding unit, the second superabsorbent polymer granule feeding unit, and the third unwinding unit are sequentially distributed along the rotation direction of the forming mold wheel.

2. The high-diffusivity absorber core production equipment according to claim 1, characterized in that: The forming mold wheel also includes a drive motor, a transmission assembly, a rotating shaft, a mold wheel body, several molds, and an airflow adjustment assembly. The rotating shaft is rotatably mounted on the frame. The drive motor is connected to the rotating shaft through the transmission assembly. The mold wheel body is fixed on the rotating shaft. Each mold is evenly arranged around the circumference of the mold wheel body, and each mold has a mold cavity. The air distribution chamber is rotatably mounted on the rotating shaft and distributed within the mold wheel body. The air distribution chamber is provided with an exhaust port for discharging air from the chamber and an intake port for drawing in external air. The airflow adjustment assembly is located at the intake port and is used to adjust the airflow rate at the intake port. The intake port communicates with part of the mold cavities.

3. The high-diffusivity absorber core production equipment according to claim 2, characterized in that: The gas distribution chamber includes a sleeve, two partitions, an arc-shaped baffle, an arc-shaped cover, and two side plates. The sleeve is rotatably mounted on a rotating shaft. The two partitions are perpendicularly disposed on the sleeve along the radial direction. The arc-shaped baffle is connected to the two partitions. The two side plates are disposed on the arc-shaped baffle and the partitions and are distributed at both ends of the sleeve along the axial direction. The partitions, arc-shaped baffle, and side plates form a chamber with an opening. The arc-shaped cover is disposed at the opening of the chamber, and the air intake is disposed on the arc-shaped cover.

4. The high-diffusivity absorber core production equipment according to claim 3, characterized in that: The air volume adjustment assembly includes a fixed seat on the side plate, a movable seat slidably mounted on the fixed seat, and an adjustment seat locked on the movable seat. The fixed seat has a strip groove, and the movable seat has a threaded hole. The fixed seat and the movable seat are locked together by locking bolts passing through the strip groove and the threaded hole.

5. The high-diffusivity absorber core production equipment according to claim 4, characterized in that: The bottom surface of the mold cavity is recessed with a groove, so that the bottom surface of the mold cavity forms a stepped structure. The bottom surface of the mold cavity has a first support surface, a second support surface, and a connecting surface connecting the first support surface and the second support surface.

6. The high-diffusivity absorber core production equipment according to claim 5, characterized in that: The connecting surface is provided with a first adsorption hole, which is connected to the negative pressure adsorption zone.

7. The high-diffusivity absorber core production equipment according to claim 5, characterized in that: The connecting surfaces are inclined, and the inclination angle of the connecting surfaces is 15° to 89°.

8. The high-diffusivity absorber core production equipment according to any one of claims 1 to 7, characterized in that: Both the first and second superabsorbent polymer (SAP) granule feeding units include a storage bin and a feeding roller. The circumferential surface of the feeding roller is provided with a storage trough for storing SAP granules, and the circumferential surface of the feeding roller is provided with a support platform that cooperates with the protrusion.

9. The high-diffusivity absorber core production equipment according to claim 8, characterized in that: The side of the protrusion is provided with a second adsorption hole, which is connected to the negative pressure adsorption zone.

10. A high-diffusivity absorber core production equipment, characterized in that: It includes a frame, a control unit, a forming die wheel, a first unwinding unit, a second unwinding unit, a third unwinding unit, a first wood pulp fiber feeding unit, a second wood pulp fiber feeding unit, a first superabsorbent polymer granule feeding unit, and a second superabsorbent polymer granule feeding unit. The forming mold wheel is rotatably mounted on the frame. Several mold cavities are provided on the circumferential surface of the forming mold wheel. The bottom surface of the mold cavity is provided with a protruding strip. The forming mold wheel includes a gas distribution chamber. The gas distribution chamber forms a negative pressure adsorption zone on the forming mold wheel. When the forming mold wheel rotates, the part of the mold cavity that enters the negative pressure adsorption zone is connected to the gas distribution chamber. The first unwinding unit, the second unwinding unit, the third unwinding unit, the first wood pulp fiber feeding unit, the second wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, and the second superabsorbent polymer granule feeding unit are respectively disposed on the periphery of the forming mold wheel and distributed in the negative pressure adsorption area. The first unwinding unit, the first wood pulp fiber feeding unit, the first superabsorbent polymer granule feeding unit, the second unwinding unit, the second superabsorbent polymer granule feeding unit, the second wood pulp fiber feeding unit, and the third unwinding unit are sequentially distributed along the rotation direction of the forming mold wheel.

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