A preparation process of a high diffusivity absorbent core

Abstract

The invention relates to the field of disposable sanitary products, and in particular to a preparation process of a high-diffusibility absorbent core. The prepared absorbent core has a fast diffusion speed and high absorption efficiency. The preparation process of the core body comprises the following steps: a. unwinding and conveying a top layer through a first unwinding unit, applying glue to the upper surface of the top layer, and conveying the top layer to a forming die wheel; b. connecting the first unwinding unit to a control unit to obtain a material unwinding time; c. obtaining the material unwinding time in step b and obtaining a stop time; d. forming a first wood pulp fiber layer; e. forming a first high-molecular water-absorbing resin particle layer; f. unwinding and conveying an intermediate layer through a second unwinding unit, and then covering the intermediate layer on a product of step e; g. applying glue to the upper surface of the intermediate layer in step f; h. forming a second wood pulp fiber layer; i. forming a second high-molecular water-absorbing resin particle layer; j. unwinding and conveying a bottom layer through a third unwinding unit, and then covering the bottom layer on the product of step i.

Description

Technical Field

[0001] The invention relates to the field of disposable sanitary products, and in particular to a preparation process of a high-diffusivity absorbent core. Background Art

[0002] Absorbent cores are widely used in care absorbent products such as diapers and sanitary napkins. The absorbent core should be able to retain liquid for a long time, such as overnight use of diapers, minimize back-seepage to keep the wearer dry, and avoid dirty clothes or sheets. The absorbent core that is widely used on the market is composed of a double-layer or three-layer non-woven fabric with a polymer absorbent resin material sandwiched between the two layers. The polymer absorbent resin material is spread on the upper surface of one layer of the non-woven fabric, and then composited with another layer of non-woven fabric by spraying glue. The thickness of this absorbent core is relatively thin, but the polymer absorbent resin material is not easy to fix, which can easily cause the polymer absorbent resin material to deviate or leak. At the same time, the polymer absorbent resin material absorbs water quickly, and swells after absorbing liquid, and the volume increases to more than ten times its original volume, so that the polymer absorbent resin material in the upper part is easy to hinder the liquid from seeping after preferentially absorbing liquid and swelling, which seriously affects the water absorption efficiency. Summary of the invention

[0003] Therefore, in order to solve the above problems, the present invention provides a process for preparing a highly diffusible absorbent core with fast diffusion speed and high absorption efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A preparation process of a high-diffusivity absorbent core, comprising a core body, wherein the longitudinal length of the core body is 5 cm to 80 cm, and the preparation process of the core body comprises the following steps:

[0006] a. The top layer is unrolled and conveyed by the first unwinding unit, and glue is applied to the upper surface of the top layer, and the top layer is conveyed to the forming die wheel. A plurality of cavities are arranged on the circumferential surface of the forming die wheel, and convex strips are convexly arranged on the bottom surface of the cavity. The top layer is adsorbed in the cavity of the forming die wheel. The conveying direction of the top layer is defined as the longitudinal direction, and the width direction of the top layer is defined as the transverse direction;

[0007] b. The first unwinding unit is connected to the control unit, and the start time and unwinding speed of the first unwinding unit are obtained through the control unit. By determining the longitudinal length dimension of a single core body, the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is determined, and the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is defined as the unwinding time;

[0008] c. Obtain the unloading time in step b, determine the rotation speed of the molding die wheel by making the longitudinal length dimension of the die cavity equal to the longitudinal length dimension of the single core body, and determine the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities, and define the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities as the stop time;

[0009] d. obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming mold wheel through the first wood pulp fiber feeding unit to form a first wood pulp fiber layer;

[0010] e. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the forming die wheel through the first polymer water absorbent resin particle unloading unit to form a first polymer water absorbent resin particle layer, wherein wood pulp fibers and polymer water absorbent resin particles are not applied to the portions corresponding to the convex strips;

[0011] f. The middle layer is unrolled and conveyed by the second unwinding unit, and glue is applied to the lower surface of the middle layer, and then the middle layer is covered on the product of step e, and the top layer and the middle layer are bonded and connected at the convex strips;

[0012] g. applying glue to the upper surface of the middle layer in step f;

[0013] h. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming mold wheel through a second wood pulp fiber feeding unit to form a second wood pulp fiber layer;

[0014] i. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the forming die wheel through a second polymer water absorbent resin particle unloading unit to form a second polymer water absorbent resin particle layer, wherein wood pulp fibers and polymer water absorbent resin particles are not applied to the portions corresponding to the convex strips;

[0015] j. The bottom layer is unrolled and conveyed by the third unwinding unit, and glue is applied to the lower surface of the bottom layer, and then the bottom layer is covered on the product of step i, and the middle layer and the bottom layer are bonded and connected at the convex strips;

[0016] k. Obtain the unloading time in step b and the stopping time in step c, and use a slitting unit to cut the product along the area corresponding to the stopping time of step j to form a single core body.

[0017] Furthermore, the wood pulp fibers and polymer water-absorbent resin particles of the core body have a pressurized absorption capacity measured at a pressure of 4.136 KPa of not less than 8.4 g / g.

[0018] Furthermore, the wood pulp fibers and polymer water-absorbing resin particles of the core body have a water absorption rate of no more than 10 seconds when measured under a pressure of 4.136 KPa.

[0019] Furthermore, when the first wood pulp fiber layer and the first high molecular water absorbent resin particle layer absorb water and swell, a first guide channel is formed on the core body corresponding to the convex strip, and when the second wood pulp fiber layer and the second high molecular water absorbent resin particle layer absorb water and swell, a second guide channel is formed on the core body corresponding to the convex strip, and the orthographic projections of the first guide channel and the second guide channel coincide.

[0020] Furthermore, the core body has a front waist area, a back waist area and a crotch area distributed in sequence along the longitudinal direction, and the first wood pulp fiber layer and the first high molecular water-absorbing resin particle layer are distributed in the front waist area and the crotch area.

[0021] Furthermore, the water absorption capacity of the core body decreases in a step-like manner from the longitudinal middle portion to the longitudinal ends of the core body.

[0022] Furthermore, the average gram weight of the polymer water-absorbing resin particles is 0.1 g / m² to 20 g / m².

[0023] Furthermore, the weight of the top layer, the bottom layer and the middle layer is 5gsm to 30gsm.

[0024] A preparation process of a high-diffusivity absorbent core, comprising a core body, wherein the longitudinal length of the core body is 5 cm to 80 cm, and the preparation process of the core body comprises the following steps:

[0025] a. The top layer is unrolled and conveyed by the first unwinding unit, and glue is applied to the upper surface of the top layer, and the top layer is conveyed to the forming die wheel. A plurality of cavities are arranged on the circumferential surface of the forming die wheel, and convex strips are convexly arranged on the bottom surface of the cavity. The top layer is adsorbed in the cavity of the forming die wheel. The conveying direction of the top layer is defined as the longitudinal direction, and the width direction of the top layer is defined as the transverse direction;

[0026] b. The first unwinding unit is connected to the control unit, and the start time and unwinding speed of the first unwinding unit are obtained through the control unit. By determining the longitudinal length dimension of a single core body, the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is determined, and the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is defined as the unwinding time;

[0027] c. Obtain the unloading time in step b, determine the rotation speed of the molding die wheel by making the longitudinal length dimension of the die cavity equal to the longitudinal length dimension of the single core body, and determine the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities, and define the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities as the stop time;

[0028] d. obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming mold wheel through the first wood pulp fiber feeding unit to form a first wood pulp fiber layer;

[0029] e. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the forming die wheel through the first polymer water absorbent resin particle unloading unit to form a first polymer water absorbent resin particle layer, wherein wood pulp fibers and polymer water absorbent resin particles are not applied to the portions corresponding to the convex strips;

[0030] f. The middle layer is unrolled and conveyed by the second unwinding unit, and glue is applied to the lower surface of the middle layer, and then the middle layer is covered on the product of step e, and the top layer and the middle layer are bonded and connected at the convex strips;

[0031] g. applying glue to the upper surface of the middle layer in step f;

[0032] h. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the molding die wheel through a second polymer water absorbent resin particle feeding unit to form a second polymer water absorbent resin particle layer;

[0033] i. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming die wheel through a second wood pulp fiber feeding unit to form a second wood pulp fiber layer, wherein wood pulp fibers and high molecular water-absorbing resin particles are not applied to the portions corresponding to the convex strips;

[0034] j. The bottom layer is unrolled and conveyed by the third unwinding unit, and glue is applied to the lower surface of the bottom layer, and then the bottom layer is covered on the product of step i, and the middle layer and the bottom layer are bonded and connected at the convex strips;

[0035] k. Obtain the unloading time in step b and the stopping time in step c, and use a slitting unit to cut the product along the area corresponding to the stopping time of step j to form a single core body.

[0036] By adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: in the preparation process of the highly diffusible absorbent core, the control unit obtains the start-up time and the unwinding speed of the first unwinding unit, and by determining the longitudinal length dimension of a single core body, the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is determined, and then the rotation speed of the molding die wheel is determined, and the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent mold cavities is determined, so that the first unwinding unit, the second unwinding unit, and the third unwinding unit are respectively matched with the conveying speed of the molding die wheel, and the first wood pulp fiber unwinding unit, the second wood pulp fiber unwinding unit, The first polymer water-absorbent resin particle feeding unit and the second polymer water-absorbent resin particle feeding unit are respectively accurately positioned with the mold cavity of the molding die wheel, and intermittent material application is achieved, thereby improving the accurate feeding of wood pulp fibers and polymer water-absorbent resin particles, ensuring the uniformity of application of wood pulp fibers and polymer water-absorbent resin particles, and improving the quality of the molded core body. In addition, the production efficiency of the core body is improved through the above-mentioned positioning method. Furthermore, the prepared core body is fixed by setting wood pulp fibers and spraying glue to fix the polymer water-absorbent resin particles, so that the polymer water-absorbent resin particles are fixed to avoid deviation or leakage. At the same time, the diversion channel formed by the core body can accelerate the flow and infiltration speed of the liquid, thereby improving the water absorption efficiency of the prepared core body. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0038] Figure 2 is a circuit module diagram of the first embodiment of the present invention;

[0039] Figure 3 It is a partial structural schematic diagram of the forming die wheel in the unfolded state in the first embodiment of the present invention;

[0040] Figure 4 is a schematic diagram of a top view of a core body of the first structure in the first embodiment of the present invention;

[0041] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle;

[0042] Figure 6 is a schematic cross-sectional structural diagram of a core body of the second structure in the first embodiment of the present invention;

[0043] Figure 7 1 is a schematic diagram of a top view of the core body of the third structure in the first embodiment of the present invention;

[0044] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure at the middle BB;

[0045] Fig. 9 is a schematic diagram of a top view of the core body of the fourth structure in the first embodiment of the present invention;

[0046] Fig.10 is a schematic diagram of the structure of the detection instrument in the first embodiment of the present invention;

[0047] Fig.11 1 is a schematic diagram of the top view of the water guide plate of the detection instrument in the first embodiment of the present invention;

[0048] Fig.12 is a structural diagram of Embodiment 2 of the present invention;

[0049] Fig.13 It is a schematic diagram of the cross-sectional structure of the core body of the fifth structure in the second embodiment of the present invention. DETAILED DESCRIPTION

[0050] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0051] The embodiments of the present invention are: Embodiment 1

[0052] refer to Figure 1 , Figure 2 and Figure 3 As shown, a preparation process of a high-diffusivity absorbent core comprises a core body 1, wherein the longitudinal length of the core body 1 is 5 cm to 80 cm, preferably 30 cm, and the preparation process of the core body 1 comprises the following steps:

[0053] a. The top layer 11 is unrolled and conveyed by the first unwinding unit 53, and glue is applied to the upper surface of the top layer 11, and the top layer 11 is conveyed to the forming die wheel 52. A plurality of cavities 521 are provided on the circumferential surface of the forming die wheel 52, and convex strips 522 are convexly provided on the bottom surface of the cavities 521. The top layer 11 is adsorbed in the cavities 521 of the forming die wheel 52. The conveying direction of the top layer 11 is defined as the longitudinal direction, and the width direction of the top layer 11 is defined as the transverse direction;

[0054] b. The first unwinding unit 53 is connected to the control unit 51, and the start 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 by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of the single core body 1 is determined, and the time taken by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of the single core body 1 is defined as the unwinding time;

[0055] c. Obtain the unloading time in step b, and determine the rotation speed of the molding die wheel 52 by making the longitudinal length dimension of the die cavity 521 equal to the longitudinal length dimension of the single core body 1, and determine the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent die cavities 521, and define the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent die cavities 521 as the stop time;

[0056] d. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding 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 a first wood pulp fiber layer 22;

[0057] e. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity 521 of the molding die wheel 52 through the first polymer water absorbent resin particle unloading unit 55 to form a first polymer water absorbent resin particle layer 21, and no wood pulp fibers and polymer water absorbent resin particles are applied to the portions corresponding to the convex strips 522;

[0058] f. The middle layer 13 is unrolled and conveyed by the second unwinding unit 56, and glue is applied to the lower surface of the middle layer 13, and then the middle layer 13 is covered on the product of step e, and the top layer 11 and the middle layer 13 are bonded and connected at the convex strips 522;

[0059] g. applying glue to the upper surface of the intermediate layer 13 in step f;

[0060] h. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding 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 a second wood pulp fiber layer 32;

[0061] i. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water-absorbent resin particles into the mold cavity 521 of the molding die wheel 52 through the second polymer water-absorbent resin particle unloading unit 58 to form a second polymer water-absorbent resin particle layer 31, and no wood pulp fibers and polymer water-absorbent resin particles are applied to the portions corresponding to the convex strips 522;

[0062] j. The bottom layer 12 is unrolled and conveyed by the third unwinding unit 59, and glue is applied to the lower surface of the bottom layer 12, and 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 and connected at the convex strips 522;

[0063] k. Obtain the unloading time in step b and the stopping time in step c, and use a slitting unit to cut along the area corresponding to the stopping time of the product in step j to form a single core body 1.

[0064] Moreover, the average gram weight of the polymer water-absorbing resin particles is 0.1 g / m² to 20 g / m², preferably 6 g / m².

[0065] In the preparation process of the high-diffusivity absorbent core, the control unit 51 obtains the start time and the unwinding speed of the first unwinding unit 53, and determines the longitudinal length dimension of the single core body 1, thereby determining the time taken by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of the single core body 1, and then determines the rotation speed of the molding die wheel 52, and determines the time taken by the first unwinding unit 53 to unwind the top layer of the spacing dimension between two adjacent mold cavities 521, so that the first unwinding unit 53, the second unwinding unit 56, and the third unwinding unit 59 are respectively matched with the conveying speed of the molding die wheel 52, and the first wood pulp fiber unloading unit 54, the second wood pulp fiber unloading unit 57, The first polymer water-absorbent resin particle feeding unit 55 and the second polymer water-absorbent resin particle feeding unit 58 are respectively precisely positioned with the mold cavity 521 of the molding die wheel 52, and intermittent material application is achieved, thereby improving the precise feeding of wood pulp fibers and polymer water-absorbent resin particles, ensuring the uniformity of application of wood pulp fibers and polymer water-absorbent resin particles, and improving the quality of the molded core body 1. In addition, through the above-mentioned positioning method, the production efficiency of the core body 1 is improved. Furthermore, the prepared core body 1 is fixed by setting wood pulp fibers and spraying glue to fix the polymer water-absorbent resin particles, so that the polymer water-absorbent resin particles are fixed to avoid deviation or leakage. At the same time, the diversion channel formed by the core body 1 can accelerate the flow and infiltration speed of the liquid, thereby improving the water absorption efficiency of the prepared core body 1.

[0066] In this embodiment, reference Figure 4 and Figure 5 As shown, a high diffusibility absorbent core comprises a core body 1, wherein the core body 1 has a longitudinal direction extending along the length direction thereof and a transverse direction extending along the width direction thereof, the longitudinal length dimension of the core body 1 is 5 cm to 80 cm, preferably 30 cm, the core body 1 has a front waist region 101, a back waist region 102 and a crotch region 103 distributed in sequence along the longitudinal direction, the core body 1 has a first absorbent region 100 located on one transverse side of a transverse central axis a and a second absorbent region 200 located on the other transverse side of the transverse central axis a, the core body 1 comprises a top layer 11, a bottom layer 12 and an intermediate layer 13 distributed between the top layer 11 and the bottom layer 12, and the gram weight of the top layer 11, the bottom layer 12 and the intermediate layer 13 is 5 gsm to 30 gsm;

[0067] A first absorbent material layer is provided between the top layer 11 and the middle layer 13, the first absorbent material layer includes 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 includes a second absorbent material, the first absorbent material layer and the second absorbent material layer both have a front edge and a rear edge distributed at both ends of the longitudinal direction and a left edge and a right edge distributed at both ends of the lateral direction, the first absorbent material includes a first polymer water-absorbent resin particle layer 21 and a first wood pulp fiber layer 22, the first wood pulp fiber layer 22 is close to the top layer 11, the second absorbent material includes a second polymer water-absorbent resin particle layer 31 and a second wood pulp fiber layer 32, the second wood pulp fiber layer 32 is close to the bottom layer 12, the first polymer water-absorbent resin particle layer 21 and the second polymer water-absorbent resin particle layer 31 have an average gram weight of 0.1g / m² to 20g / m², preferably 6 g / m², the first absorption area 100 of the first absorption material layer is provided with at least one first slit 4 free of first absorption material along the longitudinal direction, preferably one, the second absorption area 200 of the first absorption material layer is provided with at least one second slit 5 free of first absorption material along the longitudinal direction, preferably one, the first slit 4 and the second slit 5 are symmetrically distributed along the transverse central axis a of the core body 1;

[0068] The top layer 11 and the middle layer 13 are compositely connected at the first slit 4 and the second slit 5. When the first absorbent material swells, the first slit 4 of the first absorption area 100 and the second slit 5 of the second absorption area 200 form a first guide channel 6.

[0069] In the present embodiment, the top layer 11, bottom layer 12 and middle layer 13 are all water-permeable nonwoven fabrics, and certainly can also be, for example, tissue paper (air-permeable felt or wet-laid), which has a range of, for example, 5 to 100gsm, specifically a basis weight of 10 to 40gsm. The top layer 11, bottom layer 12 and middle layer 13 can also be formed by a low basis weight nonwoven web with a grammage between 5gsm and 30gsm, such as a carded nonwoven, a spunbond nonwoven or a melt-blown nonwoven and a laminate of any of these webs. For example, a melt-spun polypropylene nonwoven fabric, and has a basis weight range of about 5gsm to 20gsm. Nonwoven materials are typically inherently hydrophobic, and the top layer 11 can therefore be treated to make it hydrophilic, for example, by treating it with a surfactant or other methods known in the art. The top layer 11, bottom layer 12 and middle layer 13 can be made of the same or different materials, optionally treated in different ways to make the top layer 11 more hydrophilic than the bottom layer 12, or paper, tissue, film, woven fabric or a laminate of any of these can also be used.

[0070] The high-diffusivity absorbent core improves the absorption capacity of the core body 1 by providing 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. At the same time, the first absorbent material and the second absorbent material are isolated by the middle layer 13. The first absorbent material includes a first polymer water-absorbent resin particle layer 21 and a first wood pulp fiber layer 22. The first wood pulp fiber layer 22 is close to the top layer 11. The second absorbent material includes a second polymer water-absorbent resin particle layer 31 and a second wood pulp fiber layer 32. The second wood pulp fiber layer 32 is close to the bottom layer 12. After the wood pulp fibers are glued to the top layer 11 or the bottom layer 12, the softness of the top layer 11 or the bottom layer 12 is increased, and the thickness and bulkiness are ensured. After adding the first polymer water-absorbent resin particle layer 21 or the second polymer water-absorbent resin particle layer 31, the polymer water-absorbent resin particles are embedded in the gaps between the wood pulp fibers and fixed to the bottom layer 12 by the wood pulp fibers. The top layer or the bottom layer constrains the polymer water-absorbent resin particles so that the polymer water-absorbent resin particles are fixed and provide sufficient expansion space for them to ensure the absorption amount of the polymer water-absorbent resin particles. The first absorption area 100 and the second absorption area 200 of the first absorption material layer are respectively provided with a first slit 4 and a second slit 5 that do not contain the first absorbent material, and the top layer 11 and the middle layer 13 are compositely connected at the first slit 4 and the second slit 5, so as to encapsulate the polymer water-absorbent resin particles and prevent excessive polymer water-absorbent resin particles from leaking to the first slit 4 and the second slit 5. When in use, the liquid is absorbed by the first absorbent material, and the polymer water-absorbent resin particles in the first absorbent material absorb the liquid and swell, so that the first guide channel 6 is formed at the first slit 4 and the second slit 5, and a part of the excess liquid seeps down to the second absorbent material through the middle layer 13 and is absorbed by it, and the other part is guided to flow along the first guide channel 6, and the guide effect is good, thereby improving the diffusion and absorption efficiency of the core body 1.

[0071] Furthermore, the first absorption zone 100 of the second absorption material layer is provided with at least one third slit 7 not containing the second absorption material along the longitudinal direction, preferably one, and the second absorption zone 200 of the second absorption material layer is provided with at least one fourth slit 8 not containing the second absorption material along the longitudinal direction, preferably one, and the bottom layer 12 and the middle layer 13 are compositely connected at the third slit 7 and the fourth slit 8. When the second absorption material swells, the third slit 7 of the first absorption zone 100 and the fourth slit 8 of the second absorption zone 200 form a second guide channel 9, and the first guide channel 6 coincides with the orthographic projection of the second guide channel 9.

[0072] When in use, the liquid is absorbed by the first absorbent material, and the polymer water-absorbent resin particles in the first absorbent material absorb the liquid and swell, so that a first guide channel 6 is formed at the first slit 4 and the second slit 5, and a part of the excess liquid seeps through the middle layer 13 to the second absorbent material and is absorbed, and the polymer water-absorbent resin particles in the second absorbent material absorb the liquid and swell, so that a second guide channel 9 is formed at the third slit 7 and the fourth slit 8, and the other part is guided to flow along the second guide channel 9, and the guide effect is good, further improving the diffusibility and absorption efficiency of the core body 1.

[0073] In the above embodiment, the orthographic projections of the first guide channel 6 and the second guide channel 9 coincide with each other. Figure 6 As shown, the orthographic projections of the first guide channel 6 and the second guide channel 9 are staggered in the lateral direction. This structure enables the second guide channel 9 to provide a certain guide effect when there is too much liquid, and improves the air permeability, thereby improving the comfort of use.

[0074] refer to Figure 7 and Figure 8 As shown, the longitudinal length dimension 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, and the rear end of the first guide channel 6 is connected with the rear edge, so that the liquid flowing in the first guide channel 6 can overflow through the rear end into the second absorbent material layer, thereby improving the absorption speed. At the same time, the first absorbent material layer is distributed in the front waist area 101 and the crotch area 103 according to the actual use area, which can reduce the use amount of the first absorbent material and ensure that the change of the absorption amount is small, thereby improving the utilization rate of the first absorbent material and reducing the production cost.

[0075] It is disclosed above that the rear end of the first flow guiding channel 6 is communicated with the rear edge. Of course, it can also be arranged that: the front end of the first flow guiding channel 6 is communicated with the front edge.

[0076] refer to Fig. 9As shown, the number of the first slit 4, the second slit 5, the third slit 7 and the fourth slit 8 mentioned above are all one. Of course, it can also be: the first absorption area 100 of the first absorption material layer is provided with more than two first slits 4 that do not contain the first absorption material along the longitudinal direction, the second absorption area 200 of the first absorption material layer is provided with more than two second slits 5 that do not contain the first absorption material along the longitudinal direction, the first absorption area 100 of the second absorption material layer is provided with more than two third slits 7 that do not contain the second absorption material along the longitudinal direction, and the second absorption area 200 of the second absorption material layer is provided with more than two fourth slits 8 that do not contain the second absorption material along the longitudinal direction. For example, the number of the first slit 4, the second slit 5, the third slit 7 and the fourth slit 8 are all four, and they are spaced apart in the longitudinal direction, so that the formed first guide channel 6 and the second guide channel 9 can play a guiding role, and at the same time can further limit the movement of the polymer water-absorbing resin particles, improve the uniformity of the core body 1, and ensure the guiding effect of the core body 1.

[0077] Furthermore, the first absorbent material layer and the second absorbent material layer of the core body 1 have a pressurized absorption capacity measured under a pressure of 4.136 KPa of not less than 8.4 g / g, that is, the wood pulp fibers and the polymer water-absorbent resin particles of the core body 1 have a pressurized absorption capacity measured under a pressure of 4.136 KPa of not less than 8.4 g / g, preferably 8.4 g / g or 8.6 g / g or 8.7 g / g or even higher; the first absorbent material layer and the second absorbent material layer of the core body 1 have a water absorption speed measured under a pressure of 4.136 KPa of not more than 10 s, that is, the wood pulp fibers and the polymer water-absorbent resin particles of the core body 1 have a water absorption speed measured under a pressure of 4.136 KPa of not more than 10 s, preferably 10 s or 9 s or 8 s or even less.

[0078] refer to Fig.10 and Fig.11 As shown, the detection method:

[0079] 1. Prepare instruments:

[0080] Compact block 201: The mass of the compact block 201 is 0.4136 kg, the bottom surface of the compact block 201 is a circular structure, and an electrode is provided inside the compact block 201;

[0081] Plastic cylinder 202: the area of ​​the plastic cylinder 202 is 1000.0 mm²±0.5 mm², the height of the plastic cylinder 202 is 60.0 mm±0.5 mm, and a nylon mesh with a pore size of 36 μm is adhered to the bottom of the plastic cylinder 202;

[0082] Metal frame 203: The metal frame 203 has a filter screen;

[0083] Timer 218;

[0084] Water guide plate 204: A through hole 205 is provided in the middle of the water guide plate 204, and a water pipe joint 206 is connected to the through hole 205. Six water guide grooves 207 are concavely provided on the upper surface of the water guide plate 204 along its radial direction;

[0085] Water pumping system: The water pumping system includes a water pump 208 and a water pipe 209 connected to the water pump 208;

[0086] Water tank 210: The water tank 210 has a water storage chamber 211. A baffle plate 213 in an annular structure is provided on the upper surface of the water tank 210. A water guide chamber 212 is formed between the baffle plate 213 and the water tank 210. A water outlet hole 214 and an overflow hole 215 are provided on the upper surface of the water tank 210, which communicate with the water storage chamber 211 and the water guide chamber 212.

[0087] Bracket 216;

[0088] Lifting assembly 217;

[0089] Balance;

[0090] The water pump 208 is arranged in the water storage chamber 211, the bracket 216 is horizontally mounted on the baffle 213, the metal frame 203 is arranged on the bracket 216, and is used to place the plastic cylinder 202, the lifting component 217 is arranged on the water guide chamber 212, the water guide plate 204 is arranged at the upper end of the lifting component 217, and is distributed on the lower side of the metal frame 203, the water pipe 209 passes through the water outlet hole 214 and is connected to the water pipe joint 206 of the water guide plate 204, and the timer 218 is connected to the electrode of the pressing block 201 and the metal frame 203 through the wire 219.

[0091] 2. Testing steps:

[0092] a. Carry out the test under the standard atmospheric pressure;

[0093] b. Weigh 9.0 g of sodium chloride in a beaker, transfer it to a 1 L volumetric flask after dissolving it, dilute it with water to the scale and shake it well to prepare a 0.9% saline solution, and inject the saline solution into the water storage chamber 211 of the water tank 210;

[0094] c. Prepare 5 core bodies 1 with an area of ​​(50±0.2) mm*(80±0.2) mm as samples, carefully extract wood pulp fibers and polymer water-absorbing resin particles from the core body 1, for example, by carefully shaking or sucking, and use a freezing spray to separate the top layer 11, the bottom layer 12 and the middle layer 13 from each other and then peel off the wood pulp fibers and the polymer water-absorbing resin particles. The samples should be kept at 21°C±2°C and 50%±20%RH for at least 24 hours to reach equilibrium;

[0095] d. Put the wood pulp fibers and polymer water-absorbing resin particles peeled off from a single sample into a plastic cylinder 202 and compact them to form a block sample, and weigh the dry sample with a balance, which is recorded as dry weight m1;

[0096] e. Place the plastic cylinder 202 connected to the sample on the metal frame 203, and weigh the dry sample and the dry test module (plastic cylinder 202 and metal frame 203) with a balance, and record it as dry weight m2;

[0097] f. Gently place the pressing block 201 on the top of the sample and let it stand for 30 seconds. Then, lift the water guide plate 204 through the lifting assembly 217 so that the water guide plate 204 is against the metal frame 203.

[0098] g. Start the water pump system and inject physiological saline into the plastic cylinder 202. When the surface of the physiological saline contacts the filter screen of the metal frame 203, the timer 218 starts. After the physiological saline completely permeates the sample, the built-in electrodes on the pressing block 201 are turned on and the timer 218 stops timing. At this time, the reading of the timer 218 is the water absorption speed of the sample.

[0099] 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 is lowered, and the level of the physiological saline drops below the filter screen of the metal frame 203. The soaked sample begins to drain under the action of the pressing block 201. After 30 seconds of drainage, the pressing block 201 is removed, and the soaked sample and the test module are measured with a balance, which is recorded as the wet weight m3;

[0100] i. Take another set of dry test modules, repeat steps d, e, f, g, and h, and measure the wet test modules with a balance, which is recorded as wet weight m4;

[0101] j. Calculate the pressure absorption of the sample K = ((m3-m2)-(m4-(m2-m1))) / m1;

[0102] k. Repeat the above steps five times and take the average value. Embodiment 2

[0103] refer to Fig.12 and Fig.13As shown, a preparation process of a high-diffusivity absorbent core comprises a core body 1, wherein the longitudinal length of the core body 1 is 5 cm to 80 cm, preferably 30 cm, and the preparation process of the core body 1 comprises the following steps:

[0104] a. The top layer 11 is unrolled and conveyed by the first unwinding unit 53, and glue is applied to the upper surface of the top layer 11, and the top layer 11 is conveyed to the forming die wheel 52. A plurality of cavities 521 are provided on the circumferential surface of the forming die wheel 52, and convex strips 522 are convexly provided on the bottom surface of the cavities 521. The top layer 11 is adsorbed in the cavities 521 of the forming die wheel 52. The conveying direction of the top layer 11 is defined as the longitudinal direction, and the width direction of the top layer 11 is defined as the transverse direction;

[0105] b. The first unwinding unit 53 is connected to the control unit 51, and the start 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 by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of the single core body 1 is determined, and the time taken by the first unwinding unit 53 to unwind the top layer of the longitudinal length dimension of the single core body 1 is defined as the unwinding time;

[0106] c. Obtain the unloading time in step b, and determine the rotation speed of the molding die wheel 52 by making the longitudinal length dimension of the die cavity 521 equal to the longitudinal length dimension of the single core body 1, and determine the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent die cavities 521, and define the time taken by the first unwinding unit 53 to unwind the top layer 11 of the spacing dimension between two adjacent die cavities 521 as the stop time;

[0107] d. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding 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 a first wood pulp fiber layer 22;

[0108] e. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity 521 of the molding die wheel 52 through the first polymer water absorbent resin particle unloading unit 55 to form a first polymer water absorbent resin particle layer 21, and no wood pulp fibers and polymer water absorbent resin particles are applied to the portions corresponding to the convex strips 522;

[0109] f. The middle layer 13 is unrolled and conveyed by the second unwinding unit 56, and glue is applied to the lower surface of the middle layer 13, and then the middle layer 13 is covered on the product of step e, and the top layer 11 and the middle layer 13 are bonded and connected at the convex strips 522;

[0110] g. applying glue to the upper surface of the intermediate layer 13 in step f;

[0111] h. Obtaining the unloading time in step b and the stopping time in step c, and intermittently adding polymer water-absorbent resin particles into the mold cavity 521 of the molding die wheel 52 through the second polymer water-absorbent resin particle unloading unit 58 to form a second polymer water-absorbent resin particle layer 31;

[0112] i. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity 521 of the forming die wheel 52 through the second wood pulp fiber feeding unit 57 to form a second wood pulp fiber layer 32, wherein wood pulp fibers and high molecular water-absorbing resin particles are not applied to the portions corresponding to the convex strips 522;

[0113] j. The bottom layer 12 is unrolled and conveyed by the third unwinding unit 59, and glue is applied to the lower surface of the bottom layer 12, and 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 and connected at the convex strips 522;

[0114] k. Obtain the unloading time in step b and the stopping time in step c, and use a slitting unit to cut along the area corresponding to the stopping time of the product in step j to form a single core body 1.

[0115] The above embodiment discloses 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. Of course, it can also be set as: 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 middle layer 13. Such a design allows the first polymer water-absorbent resin particle layer 21 and the second polymer water-absorbent resin particle layer 31 to be separated by the middle layer 13 and the second wood pulp fiber layer 32, so that the expansion space of the first polymer water-absorbent resin particle layer 21 and the second polymer water-absorbent resin particle layer 31 is increased, and the second wood pulp fiber layer 32 can form a lateral diversion effect, thereby further improving the utilization rate of the polymer water-absorbent resin particles; or, the first wood pulp fiber layer 22 is close to the middle layer 13, and the second wood pulp fiber layer 32 is close to the bottom layer 12; or, the first wood pulp fiber layer 22 and the second wood pulp fiber layer 32 are both close to the middle layer 13.

[0116] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A process for preparing a highly diffusible absorbent core, comprising a core body, wherein the longitudinal length of the core body is 5 cm to 80 cm, and wherein: The preparation process of the core body comprises the following steps: a. The top layer is unrolled and conveyed by the first unwinding unit, and glue is applied to the upper surface of the top layer, and the top layer is conveyed to the forming die wheel. A plurality of cavities are arranged on the circumferential surface of the forming die wheel, and convex strips are convexly arranged on the bottom surface of the cavity. The top layer is adsorbed in the cavity of the forming die wheel. The conveying direction of the top layer is defined as the longitudinal direction, and the width direction of the top layer is defined as the transverse direction; b. The first unwinding unit is connected to the control unit, and the start time and unwinding speed of the first unwinding unit are obtained through the control unit. By determining the longitudinal length dimension of a single core body, the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is determined, and the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is defined as the unwinding time; c. Obtain the unloading time in step b, determine the rotation speed of the molding die wheel by making the longitudinal length dimension of the die cavity equal to the longitudinal length dimension of the single core body, and determine the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities, and define the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities as the stop time; d. obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming mold wheel through the first wood pulp fiber feeding unit to form a first wood pulp fiber layer; e. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the forming die wheel through the first polymer water absorbent resin particle unloading unit to form a first polymer water absorbent resin particle layer, wherein wood pulp fibers and polymer water absorbent resin particles are not applied to the portions corresponding to the convex strips; f. The middle layer is unrolled and conveyed by the second unwinding unit, and glue is applied to the lower surface of the middle layer, and then the middle layer is covered on the product of step e, and the top layer and the middle layer are bonded and connected at the convex strips; g. applying glue to the upper surface of the middle layer in step f; h. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming mold wheel through a second wood pulp fiber feeding unit to form a second wood pulp fiber layer; i. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the forming die wheel through a second polymer water absorbent resin particle unloading unit to form a second polymer water absorbent resin particle layer, wherein wood pulp fibers and polymer water absorbent resin particles are not applied to the portions corresponding to the convex strips; j. The bottom layer is unrolled and conveyed by the third unwinding unit, and glue is applied to the lower surface of the bottom layer, and then the bottom layer is covered on the product of step i, and the middle layer and the bottom layer are bonded and connected at the convex strips; k. Obtain the unloading 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 by a cutting unit to form a single core body, wherein the wood pulp fibers and high molecular water-absorbent resin particles of the core body have a pressurized absorption capacity measured at a pressure of 4.136 KPa of not less than 8.4 g / g.

2. The process for preparing the highly diffusible absorbent core according to claim 1, characterized in that: The wood pulp fibers and high molecular water-absorbing resin particles of the core body have a water absorption speed measured at a pressure of 4.136 KPa that is no greater than 10 seconds.

3. The process for preparing the highly diffusible absorbent core according to claim 1 or 2, characterized in that: When the first wood pulp fiber layer and the first high molecular water absorbent resin particle layer absorb water and swell, a first guide channel is formed on the core body corresponding to the convex strip, and when the second wood pulp fiber layer and the second high molecular water absorbent resin particle layer absorb water and swell, a second guide channel is formed on the core body corresponding to the convex strip, and the orthographic projections of the first guide channel and the second guide channel coincide.

4. The process for preparing the highly diffusible absorbent core according to claim 3, characterized in that: The core body has a front waist area, a back waist area and a crotch area distributed in sequence along the longitudinal direction; the first wood pulp fiber layer and the first high molecular water-absorbing resin particle layer are distributed in the front waist area and the crotch area.

5. The process for preparing the highly diffusible absorbent core according to claim 1, characterized in that: The water absorption capacity of the core body decreases in a step-like manner from the longitudinal middle portion of the core body to the longitudinal ends.

6. The process for preparing a highly diffusible absorbent core according to claim 1, characterized in that: The average gram weight of the polymer water-absorbing resin particles is 0.1 g / m² to 20 g / m².

7. The process for preparing a highly diffusible absorbent core according to claim 1, characterized in that: The weight of the top layer, the bottom layer and the middle layer is 5gsm to 30gsm.

8. A process for preparing a highly diffusible absorbent core, comprising a core body, wherein the longitudinal length of the core body is 5 cm to 80 cm, and wherein: The preparation process of the core body comprises the following steps: a. The top layer is unrolled and conveyed by the first unwinding unit, and glue is applied to the upper surface of the top layer, and the top layer is conveyed to the forming die wheel. A plurality of cavities are arranged on the circumferential surface of the forming die wheel, and convex strips are convexly arranged on the bottom surface of the cavity. The top layer is adsorbed in the cavity of the forming die wheel. The conveying direction of the top layer is defined as the longitudinal direction, and the width direction of the top layer is defined as the transverse direction; b. The first unwinding unit is connected to the control unit, and the start time and unwinding speed of the first unwinding unit are obtained through the control unit. By determining the longitudinal length dimension of a single core body, the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is determined, and the time taken by the first unwinding unit to unwind the top layer of the longitudinal length dimension of the single core body is defined as the unwinding time; c. Obtain the unloading time in step b, determine the rotation speed of the molding die wheel by making the longitudinal length dimension of the die cavity equal to the longitudinal length dimension of the single core body, and determine the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities, and define the time taken by the first unwinding unit to unwind the top layer of the spacing dimension between two adjacent die cavities as the stop time; d. obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming mold wheel through the first wood pulp fiber feeding unit to form a first wood pulp fiber layer; e. Obtaining the unloading time in step b and the stop time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the forming die wheel through the first polymer water absorbent resin particle unloading unit to form a first polymer water absorbent resin particle layer, wherein wood pulp fibers and polymer water absorbent resin particles are not applied to the portions corresponding to the convex strips; f. The middle layer is unrolled and conveyed by the second unwinding unit, and glue is applied to the lower surface of the middle layer, and then the middle layer is covered on the product of step e, and the top layer and the middle layer are bonded and connected at the convex strips; g. applying glue to the upper surface of the middle layer in step f; h. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding polymer water absorbent resin particles into the mold cavity of the molding die wheel through a second polymer water absorbent resin particle feeding unit to form a second polymer water absorbent resin particle layer; i. Obtaining the feeding time in step b and the stopping time in step c, and intermittently adding wood pulp fibers into the mold cavity of the forming die wheel through a second wood pulp fiber feeding unit to form a second wood pulp fiber layer, wherein wood pulp fibers and high molecular water-absorbing resin particles are not applied to the portions corresponding to the convex strips; j. The bottom layer is unrolled and conveyed by the third unwinding unit, and glue is applied to the lower surface of the bottom layer, and then the bottom layer is covered on the product of step i, and the middle layer and the bottom layer are bonded and connected at the convex strips; k. Obtain the unloading 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 by a cutting unit to form a single core body, wherein the wood pulp fibers and high molecular water-absorbent resin particles of the core body have a pressurized absorption capacity measured at a pressure of 4.136 KPa of not less than 8.4 g / g.

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