Absorbent core having high diffusivity

Abstract

An absorbent core having high diffusivity, belonging to the field of disposable sanitary products and having the advantages of high diffusion speed and high absorption efficiency. The absorbent core comprises a core body, the core body having a first absorbent area provided at one transversal side of the transverse central axis and a second absorbent area provided at the other transversal side of the transverse central axis. The core body comprises a top piece, a bottom piece, and an absorbent layer provided therebetween. The absorbent layer has a front edge and a rear edge distributed at the two longitudinal ends and a left edge and a right edge distributed at the two transversal ends. The absorbent layer comprises an absorbent material, the absorbent material comprising at least 30% by weight of polymer water-absorbing resin particles. The first absorbent area of the absorbent layer is provided with at least two first slits in the longitudinal direction which do not contain the absorbent material and which are spaced apart; and the second absorbent area of the absorbent layer is provided with at least two second slits in the longitudinal direction which do not contain the absorbent material and which are spaced apart. The top piece and the bottom piece are composited and connected at the first slits and the second slits.

Description

An absorbent core with high diffusion TECHNICAL FIELD

[0001] The utility model relates to a disposable sanitary product field especially a kind of absorbent core with high diffusion. BACKGROUND

[0002] Absorbent core is widely used in paper diaper, sanitary napkin and other nursing absorbent products. Absorbent core should be able to keep liquid for a long time, such as diaper overnight use, minimize back seepage to keep wearer dry, and avoid dirty clothes or bed sheet. The absorbent core widely used in the market at present is by double-layer non-woven fabric or three-layer non-woven fabric, high molecular water-absorbing resin material is arranged in the middle, high molecular water-absorbing resin material is spread on the upper surface of one layer of non-woven fabric, and another layer of non-woven fabric is compounded by spraying glue. The thickness of this kind of absorbent core is relatively thin, but the high molecular water-absorbing resin material is not easy to fix, and it is easy to cause the high molecular water-absorbing resin material to deviate or leak. At the same time, the high molecular water-absorbing resin material has fast water absorption speed, and swells after absorbing liquid, and the volume increases to tens of times of its original volume, so that the high molecular water-absorbing resin material in the upper part is easy to hinder liquid infiltration after preferential liquid absorption and swelling, which seriously affects the water absorption efficiency.

[0003] SUMMARY

[0004] Therefore, in view of the above problems, the utility model provides an absorbent core with high diffusion with fast diffusion speed and high absorption efficiency.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An absorbent core with high diffusion, comprising a core body, defining the core body has a longitudinal direction extending along its length and a transverse direction extending along its width, the longitudinal length of the core body is 5cm~80cm, the core body has a front waist area, a back waist area and a crotch area distributed between the front waist area and the back waist area in sequence along the longitudinal direction, the core body has a first absorption area on one side of the transverse axis and a second absorption area on the other side of the transverse axis, the core body comprises a top sheet, a bottom sheet and an absorption layer distributed between the top sheet and the bottom sheet, the grammage of the top sheet and the bottom sheet is 5gsm~30gsm.

[0007] The absorbent layer has a front edge and a rear edge distributed at the longitudinal two ends and a left edge and a right edge distributed at the transverse two ends, the absorbent layer comprises an absorbent material, the absorbent material comprises at least 30% by weight of high molecular water-absorbing resin particles, the average gram weight of the high molecular water-absorbing resin particles is 0.1 g / m2~20 g / m2, and the first absorbent area of the absorbent layer is provided with at least two first slits without absorbent material along the longitudinal direction, and the second absorbent area of the absorbent layer is provided with at least two second slits without absorbent material along the longitudinal direction;

[0008] The top sheet and the bottom sheet are composite connected at the first slits and the second slits, when the absorbent material swells, the first slits of the first absorbent area and the second slits of the second absorbent area form flow guide channels, and the flow guide channels are distributed in the crotch area and / or the front waist area.

[0009] Further, the flow guide channels are also distributed in the back waist area.

[0010] Further, the most front end of the first slit and the second slit and the front edge have absorbent material, and the last end of the first slit and the second slit and the rear edge have absorbent material.

[0011] Further, the longitudinal middle part of the left edge and the right edge of the absorbent layer is concave inwardly to form a displacement slot.

[0012] Further, the first slit and the second slit in the crotch area and the front waist area all have a straight line part, the straight line part of the first slit in the crotch area and the straight line part of the first slit in the front waist area are not located on the same straight line parallel to the transverse middle axis, and the straight line part of the second slit in the crotch area and the straight line part of the second slit in the front waist area are not located on the same straight line parallel to the transverse middle axis of the core body.

[0013] Further, the longitudinal length dimension of the straight line part of the first slit in the crotch area is greater than the longitudinal length dimension of the straight line part of the first slit in the front waist area.

[0014] Further, the first slit and the second slit are symmetrically distributed along the transverse middle axis of the core body.

[0015] Further, the first slit and the second slit in the crotch area both have an arc part.

[0016] Further, the first slit and the second slit in the crotch area and the front waist area both have at least two straight line parts, the first slit and the second slit in the crotch area both have an arc part, and the arc part is distributed between the two straight line parts.

[0017] The utility model discloses the beneficial effect is: this has high diffusion's absorption core body, through being equipped with the first slit and the second slit of not containing absorption material respectively in the first absorption area and the second absorption area of absorption layer, and the top sheet and the bottom sheet composite connection at the first slit and the second slit, thereby enveloping macromolecular water absorbent resin particle, prevent too much macromolecular water absorbent resin particle leakage to the first slit and the second slit, when using, liquid is absorbed by absorption material, and macromolecular water absorbent resin particle in absorption material absorbs liquid and swells, and the first slit and the second slit form the flow channel, and the surplus liquid is guided to flow along the flow channel, and the flow effect is good, and then improve the diffusion of core body and absorption efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is the overhead structure schematic diagram of the first kind core body of embodiment one of the utility model;

[0019] Fig. 2 is the section structure schematic diagram of A-A in Fig. 1;

[0020] Fig. 3 is the partial section structure schematic diagram of the first kind core body of embodiment one of the utility model;

[0021] Fig. 4 is the overhead structure schematic diagram of the second kind core body of embodiment one of the utility model;

[0022] Fig. 5 is the overhead structure schematic diagram of the first kind core body of embodiment two of the utility model;

[0023] Fig. 6 is the overhead structure schematic diagram of the second kind core body of embodiment two of the utility model;

[0024] Fig. 7 is the overhead structure schematic diagram of the first kind core body of embodiment three of the utility model;

[0025] Fig. 8 is the overhead structure schematic diagram of the second kind core body of embodiment three of the utility model. DETAILED DESCRIPTION

[0026] The utility model is further explained in conjunction with the drawings and specific embodiment.

[0027] The utility model embodiment is:

[0028] Embodiment one:

[0029] Referring to FIG. 1, FIG. 2 and FIG. 3, an absorbent core with high diffusion includes a core body 1, the core body 1 has 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-80cm, preferably 30cm, the core body 1 has a front waist region 101, a back waist region 102 and a crotch region 103 distributed between the front waist region 101 and the back waist region 102 in sequence along the longitudinal direction, the core body 1 has a first absorption area 100 on one side of the transverse center line a and a second absorption area 200 on the other side of the transverse center line a, the core body 1 includes a top sheet 2, a bottom sheet 3 and an absorption layer 4 distributed between the top sheet 2 and the bottom sheet 3;

[0030] The absorption layer 4 has a front edge 41 and a back edge 42 distributed at both ends of the longitudinal direction and a left edge 43 and a right edge 44 distributed at both ends of the transverse direction, the absorption layer 4 includes an absorption material 40, the absorption material 40 includes 50% by weight of high molecular water-absorbing resin particles and 50% by weight of wood pulp fibers, the average gram weight of the high molecular water-absorbing resin particles is 0.1g / m2-20g / m2, preferably 6g / m2, the first absorption area 100 of the absorption layer 4 is provided with two first slits 5 without absorption material 40 along the longitudinal direction, the second absorption area 200 of the absorption layer 4 is provided with two second slits 6 without absorption material 40 along the longitudinal direction;

[0031] The top sheet 2 and the bottom sheet 3 are composite connected at the first slits 5 and the second slits 6, when the absorption material 40 swells, the first slits 5 of the first absorption area 100 and the second slits 6 of the second absorption area 200 form flow channels, the flow channels are distributed in the crotch region 103 and the front waist region 101.

[0032] And the first slits 5 and the second slits 6 located in the crotch region 103 and the front waist region 101 each have two straight sections 201, the first slits 5 and the second slits 6 located in the crotch region 103 each have an arc section 202, the arc section 202 is distributed between the two straight sections 201, the longitudinal length of the straight section 201 of the first slit 5 located in the crotch region 103 is greater than the longitudinal length of the straight section 201 of the first slit 5 located in the front waist region 101, the first slits 5 and the second slits 6 are symmetrically distributed along the transverse center line a of the core body 1, the most front end of the first slits 5 and the second slits 6 has absorption material 40 between the front edge 41, and the last end of the first slits 5 and the second slits 6 has absorption material 40 between the back edge 42.

[0033] In this embodiment, the topsheet 2 and backsheet 3 are both water-permeable nonwovens, although they could also be, for example, thin paper (airlaid or wetlaid) having a basis weight in the range of, for example, 5 to 100 gsm, specifically 10 to 40 gsm. The topsheet 2 and backsheet 3 can also be formed from low basis weight nonwoven webs, such as carded nonwovens, spunbond nonwovens or meltblown nonwovens, and laminates of any of these webs, having a grammage of between 5 gsm and 30 gsm. For example, meltspun polypropylene nonwoven fabrics, and having a basis weight range of about 5 gsm to 20 gsm. Nonwoven materials are typically inherently hydrophobic, and the cover layers can therefore be treated to make them hydrophilic, for example by treating them with a surfactant or other method known in the art. The cover layers can be made of the same or different materials, optionally treating the topsheet differently from the backsheet to make the topsheet more hydrophilic than the backsheet, or paper, tissue, film, woven, or laminates of any of these can also be used.

[0034] In this embodiment, the absorbent material 40 comprises 50% by weight of high molecular water-absorbing resin particles and 50% by weight of wood pulp fibers, although it could also comprise 60% by weight of high molecular water-absorbing resin particles and 40% by weight of wood pulp fibers, or more than 60% by weight of high molecular water-absorbing resin particles and wood pulp fibers mixed, or other water-absorbing materials other than high molecular water-absorbing resin particles and wood pulp fibers, and wood pulp fibers can also be replaced by other hydrophilic fiber materials.

[0035] The high-diffusion absorbent core has the first and second slits 5 and 6 respectively arranged at the first and second absorption zones 100 and 200 of the absorption layer 4, and the top sheet 2 and the bottom sheet 3 are connected at the first and second slits 5 and 6, so as to encapsulate the polymer water-absorbing resin particles and prevent excessive polymer water-absorbing resin particles from leaking to the first and second slits 5 and 6. In use, the liquid is absorbed by the absorption material 40, the polymer water-absorbing resin particles in the absorption material 40 absorb the liquid to swell, so as to form a flow guide channel at the first and second slits 5 and 6, the excess liquid flows along the flow guide channel, the flow guide effect is good, and the diffusion and absorption efficiency of the core body 1 are improved. Meanwhile, the wood pulp fibers contained in the absorption material 40 can fix the polymer water-absorbing resin particles and prevent them from running, and the wood pulp fibers help the liquid to flow and infiltrate, so as to improve the utilization rate of the polymer water-absorbing resin particles and the absorption capacity. The first absorption zone 100 of the absorption layer 4 is provided with at least two first slits 5 spaced apart along the longitudinal direction, and the second absorption zone 200 of the absorption layer 4 is provided with at least two second slits 6 spaced apart along the longitudinal direction, so as to improve the bending property of the core body 1, better fit the skin in use, and provide certain strength support to prevent the liquid absorption from loosening. In this way, the distribution area of the slits is reduced under the same area condition, the volume of the absorption material is ensured, the absorption capacity and diffusion effect are improved, and the transverse diffusion effect of the liquid is improved by the arc-shaped part.

[0036] In the embodiment, the first and second slits 5 and 6 located in the crotch region 103 and the front waist region 101 each have two straight parts 201, and the first and second slits 5 and 6 located in the crotch region 103 each have an arc-shaped part 202. Of course, the first and second slits 5 and 6 located in the crotch region 103 and the front waist region 101 each can have one straight part 201, and the first and second slits 5 and 6 located in the crotch region 103 each can have two arc-shaped parts 202, and the straight parts 201 are distributed between the arc-shaped parts 202, as shown in FIG. 4.

[0037] Meanwhile, the longitudinal middle parts of the left and right edges 43 and 44 of the absorption layer 4 are concave inwardly and provided with a clearance groove 7, which is located at the crotch of the user, so as to facilitate the movement of the legs and improve the fit and comfort in use.

[0038] Embodiment Two

[0039] As shown in FIGS. 5 and 6, the difference from the first embodiment is that the flow guide channels are also distributed in the back waist region 102, and the first and second slits 5 and 6 are symmetrically distributed along the longitudinal axis b of the core body 1, so that the number of the formed flow guide channels is more, and the distribution area is wider, and the diffusion and absorption efficiency of the core body 1 are improved.

[0040] Embodiment three:

[0041] Referring to Fig. 7, the difference from the embodiment two is that the arc-shaped part 202 is omitted, and the first absorption zone 100 of the absorption layer 4 is provided with three first slits 5 not containing the absorption material 40 in the longitudinal direction, and the second absorption zone 200 of the absorption layer 4 is provided with three second slits 6 not containing the absorption material 40 in the longitudinal direction, and the first slits 5 and the second slits 6 in the crotch region 103 and the front waist region 101 all have straight parts 201, the straight part 201 of the first slit 5 in the crotch region 103 and the straight part 201 of the first slit 5 in the front waist region 101 are not located on the same straight line c parallel to the transverse center axis a of the core body 1, and the straight part 201 of the second slit 6 in the crotch region 103 and the straight part 201 of the second slit 6 in the front waist region 101 are not located on the same straight line d parallel to the transverse center axis a of the core body 1; referring to Fig. 8, of course, the first absorption zone 100 of the absorption layer 4 can be provided with six first slits 5 not containing the absorption material 40 in the longitudinal direction, and the second absorption zone 200 of the absorption layer 4 can be provided with six second slits 6 not containing the absorption material 40 in the longitudinal direction, and the number of the first slits 5 and the second slits 6 can be even more, so as to improve the bending property of the core body 1, and the core body 1 can be better attached to the skin during use, and meanwhile, a certain strength support can be provided to avoid loosening after absorbing liquid.

[0042] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0043] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature can be the first and second features directly contact, or the first and second features indirectly contact through intermediate media. Moreover, the first feature is "above", "over" and "on" the second feature can be the first feature is directly above or obliquely above the second feature, or just indicates that the first feature is higher than the second feature in horizontal height. The first feature is "below", "under" and "under" the second feature can be the first feature is directly below or obliquely below the second feature, or just indicates that the first feature is less than the second feature in horizontal height.

[0045] Although the present application is specifically shown and described in connection with preferred embodiments, those skilled in the art will appreciate that various modifications in form and detail can be made without departing from the spirit and scope of the application as defined by the appended claims.

Claims

1. An absorbent core having high diffusion, comprising a core body, characterized by: The core body has a longitudinal direction extending along its length direction and a transverse direction extending along its width direction, the core body has a longitudinal length dimension of 5 cm to 80 cm, the core body has a front waist region, a back waist region and a crotch region distributed between the front waist region and the back waist region in sequence along the longitudinal direction, the core body has a first absorption region located on one side of the transverse midline and a second absorption region located on the other side of the transverse midline, and the core body comprises a topsheet, a backsheet and an absorption layer distributed between the topsheet and the backsheet, the topsheet and the backsheet have a grammage of 5 gsm to 30 gsm; The absorbent layer has a front edge and a back edge distributed at both longitudinal ends and a left edge and a right edge distributed at both transverse ends, and comprises an absorbent material, the absorbent material comprising at least 30% by weight of high molecular water-absorbing resin particles, the high molecular water-absorbing resin particles having an average gram weight of 0.1 g / m 2 ~ 20 g / m 2 The first absorbent area of the absorbent layer is provided with at least two first slits without absorbent material along the longitudinal direction, and the second absorbent area of the absorbent layer is provided with at least two second slits without absorbent material along the longitudinal direction. The topsheet and the backsheet are connected by composite connection at the first slits and the second slits, when the absorption material swells, the first slits of the first absorption region and the second slits of the second absorption region form flow guide channels, and the flow guide channels are distributed in the crotch region and / or the front waist region.

2. The absorbent core body having high diffusivity according to claim 1, characterized by: The flow guide channels are also distributed in the back waist region.

3. The absorbent core body having high diffusivity according to claim 1, characterized by: The most front end of the first slits and the second slits and the front edge have absorption material therebetween, and the last end of the first slits and the second slits and the back edge have absorption material therebetween.

4. The absorbent core body having high diffusivity according to claim 1, characterized by: The left edge and the right edge of the absorption layer are each concavely recessed inwardly at the longitudinal middle part.

5. The absorbent core body having high diffusivity according to any one of claims 1 to 4, characterized in that: The first slits and the second slits located in the crotch region and the front waist region each have a straight line part, the straight line part of the first slit in the crotch region and the straight line part of the first slit in the front waist region are not located on the same straight line parallel to the transverse midline, and the straight line part of the second slit in the crotch region and the straight line part of the second slit in the front waist region are not located on the same straight line parallel to the transverse midline of the core body.

6. The absorbent core body having high diffusivity according to claim 5, characterized by: The longitudinal length dimension of the straight line part of the first slit located in the crotch region is greater than the longitudinal length dimension of the straight line part of the first slit located in the front waist region.

7. The absorbent core body having high diffusivity according to claim 6, characterized by: The first slits and the second slits are symmetrically distributed along the transverse midline of the core body.

8. The absorbent core body having high diffusivity according to claim 7, characterized by: The first slits and the second slits located in the crotch region each have an arc-shaped part.

9. The absorbent core body having high diffusivity according to any one of claims 1 to 4, characterized in that: The first slits and the second slits located in the crotch region and the front waist region each have at least two straight line parts, the first slits and the second slits located in the crotch region each have an arc-shaped part, and the arc-shaped part is distributed between the two straight line parts.

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