Absorbing core with high diffusivity

Abstract

The utility model relates to the field of disposable hygienic products, in particular to an absorption core with high diffusivity, which has the advantages of high diffusion speed and high absorption efficiency and comprises a core body provided with a first absorption area positioned on one transverse side of a transverse central axis and a second absorption area positioned on the other transverse side of the transverse central axis. The core body comprises a top piece, a bottom piece and an absorption layer distributed between the top piece and the bottom piece. The absorption layer is provided with a front edge and a rear edge which are distributed at two longitudinal ends and a left edge and a right edge which are distributed at two transverse ends, the absorption layer comprises an absorption material, the absorption material comprises at least 30% by weight of macromolecular water-absorbent resin particles, and at least two first slits without the absorption material are formed in a first absorption area of the absorption layer at intervals in the longitudinal direction; the second absorption area of the absorption layer is provided with at least two second slits which do not contain the absorption material along the longitudinal direction at intervals; and the top sheet and the bottom sheet are compositely connected at the first slit and the second slit.

Description

Technical Field

[0001] The utility model relates to the field of disposable sanitary products, in particular to an absorbent core with high diffusivity. 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. Utility Model Content

[0003] Therefore, in view of the above problems, the utility model provides an absorbent core with high diffusion speed, high absorption efficiency and high diffusivity.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An absorbent core with high diffusivity, comprising a core body, wherein the core body 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 is 5 cm to 80 cm, the core body has a front waist region, a rear waist region and a crotch region distributed in sequence along the longitudinal direction, the core body has a first absorbent region located on one transverse side of a transverse central axis and a second absorbent region located on the other transverse side of the transverse central axis, the core body comprises a top sheet, a bottom sheet and an absorbent layer distributed between the top sheet and the bottom sheet, the top sheet and the bottom sheet have a gram weight of 5 gsm to 30 gsm;

[0006] The absorption layer has a front edge and a rear edge distributed at both ends in the longitudinal direction and a left edge and a right edge distributed at both ends in the transverse direction, the absorption layer includes an absorption material, the absorption material includes at least 30% by weight of polymer water-absorbing resin particles, the average gram weight of the polymer water-absorbing resin particles is 0.1g / m² to 20g / m², the first absorption zone of the absorption layer is provided with at least two first slits free of absorption material at intervals in the longitudinal direction, and the second absorption zone of the absorption layer is provided with at least two second slits free of absorption material at intervals in the longitudinal direction;

[0007] The top sheet and the back sheet are compositely connected at the first slit and the second slit. When the absorbent material swells, a guide channel is formed at the first slit of the first absorption zone and the second slit of the second absorption zone. The guide channel is distributed in the crotch area and / or the front waist area.

[0008] Furthermore, the guide channels are also distributed in the rear waist area.

[0009] Furthermore, there is absorbent material between the front ends and the front edges of the first slit and the second slit, and there is absorbent material between the rear ends and the rear edges of the first slit and the second slit.

[0010] Furthermore, the longitudinal middle portions of the left edge and the right edge of the absorption layer are both concavely provided with a clearance groove.

[0011] Furthermore, the first slit and the second slit located in the crotch area and the front waist area both have straight line portions, and the straight line portion of the first slit in the crotch area and the straight line portion of the first slit in the front waist area are not located on the same straight line parallel to the transverse central axis, and the straight line portion of the second slit in the crotch area and the straight line portion of the second slit in the front waist area are not located on the same straight line parallel to the transverse central axis of the core body.

[0012] Furthermore, the longitudinal length dimension of the straight portion of the first slit located in the crotch region is greater than the longitudinal length dimension of the straight portion of the first slit located in the front waist region.

[0013] Furthermore, the first slit and the second slit are symmetrically distributed along the transverse center axis of the core body.

[0014] Furthermore, the first slit and the second slit located in the crotch area both have arc-shaped portions.

[0015] Furthermore, the first slit and the second slit located in the crotch area and the front waist area each have at least two straight line portions, and the first slit and the second slit located in the crotch area each have an arc portion, and the arc portion is distributed between the two straight line portions.

[0016] By adopting the above-mentioned technical scheme, the beneficial effects of the utility model are as follows: the absorbent core with high diffusivity is provided with a first slit and a second slit containing no absorbent material in the first absorption zone and the second absorption zone of the absorbent layer, respectively, and the top sheet and the bottom sheet are compositely connected at the first slit and the second slit, thereby encapsulating the polymer water-absorbent resin particles and preventing excessive polymer water-absorbent resin particles from leaking to the first slit and the second slit. When in use, liquid is absorbed by the absorbent material, and the polymer water-absorbent resin particles in the absorbent material absorb liquid and swell, so that a diversion channel is formed at the first slit and the second slit, and excess liquid is guided to flow along the diversion channel with good diversion effect, thereby improving the diffusivity and absorption efficiency of the core body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the top view of the first core body in the first embodiment of the utility model;

[0018] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0019] Figure 3 It is a partial cross-sectional structural schematic diagram of the first core body in the first embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the top view of the structure of the second core body in the first embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the top view of the first core body in the second embodiment of the utility model;

[0022] Figure 6 It is a schematic diagram of the top view of the structure of the second core body in the second embodiment of the utility model;

[0023] Figure 7 This is a schematic diagram of the top view of the first core body in the third embodiment of the present utility model;

[0024] Figure 8 It is a schematic diagram of the top view of the structure of the second core body in the third embodiment of the utility model. DETAILED DESCRIPTION

[0025] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0026] The utility model embodiment is: Embodiment 1

[0027] refer to Figure 1 , Figure 2 and Figure 3 As shown, an absorbent core with high diffusivity comprises a core body 1, wherein the core body 1 has a longitudinal direction extending along its length direction and a transverse direction extending along its width direction, the longitudinal length 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 sheet 2, a bottom sheet 3 and an absorbent layer 4 distributed between the top sheet 2 and the bottom sheet 3;

[0028] The absorption layer 4 has a front edge 41 and a rear edge 42 distributed at both ends in the longitudinal direction, and a left edge 43 and a right edge 44 distributed at both ends in the transverse direction. The absorption layer 4 includes an absorption material 40, and the absorption material 40 includes 50% by weight of polymer water-absorbing resin particles and 50% by weight of wood pulp fibers. The average gram weight of the polymer water-absorbing resin particles is 0.1g / m² to 20g / m², preferably 6 g / m². The first absorption area 100 of the absorption layer 4 is longitudinally spaced apart with two first slits 5 that do not contain the absorption material 40, and the second absorption area 200 of the absorption layer 4 is longitudinally spaced apart with two second slits 6 that do not contain the absorption material 40;

[0029] The top sheet 2 and the bottom sheet 3 are compositely connected at the first slit 5 and the second slit 6. When the absorbent material 40 swells, a guide channel is formed at the first slit 5 of the first absorption zone 100 and the second slit 6 of the second absorption zone 200. The guide channel is distributed in the crotch area 103 and the front waist area 101.

[0030] Furthermore, the first slit 5 and the second slit 6 located in the crotch area 103 and the front waist area 101 both have two straight portions 201, the first slit 5 and the second slit 6 located in the crotch area 103 both have an arc portion 202, and the arc portion 202 is distributed between the two straight portions 201, the longitudinal length dimension of the straight portion 201 of the first slit 5 located in the crotch area 103 is greater than the longitudinal length dimension of the straight portion 201 of the first slit 5 located in the front waist area 101, the first slit 5 and the second slit 6 are symmetrically distributed along the transverse central axis a of the core body 1, an absorbent material 40 is provided between the front end of the first slit 5 and the second slit 6 and the front edge 41, and an absorbent material 40 is provided between the rear end of the first slit 5 and the second slit 6 and the rear edge 42.

[0031] In the present embodiment, described top sheet 2 and back sheet 3 are water-permeable nonwoven fabrics, certainly also can be for example tissue paper (air felt or wet-laid), and it has scope for example 5 to 100gsm, specifically the basis weight of 10 to 40gsm.Top sheet 2 and back sheet 3 also can be formed by the low basis weight nonwoven web with the grammage between 5gsm and 30gsm, such as the laminate of carded nonwoven fabric, spunbond nonwoven fabric or melt-blown nonwoven fabric and any of these fibrous webs.For example, melt-spun polypropylene nonwoven fabric, and have about 5gsm to 20gsm basis weight scope.Nonwoven material is generally inherently hydrophobic, and upper cover layer can therefore be processed to make it become hydrophilic, for example by processing it with surfactant or other methods known in the art. The upper and lower covering layers may be made of the same or different materials, optionally treating the topsheet or the backsheet in different ways to make it more hydrophilic than the backsheet, or also using paper, tissue, film, woven fabric or a laminate of any of these.

[0032] In this embodiment, the absorbent material 40 includes 50% by weight of polymer water-absorbent resin particles and 50% by weight of wood pulp fibers. Of course, it can also include 60% by weight of polymer water-absorbent resin particles and 40% by weight of wood pulp fibers, or a mixture of polymer water-absorbent resin particles and wood pulp fibers with a weight ratio greater than 60%, or contain other absorbent materials in addition to polymer water-absorbent resin particles and wood pulp fibers. Wood pulp fibers can also replace other hydrophilic fiber materials.

[0033] The absorbent core with high diffusivity is characterized in that the first absorption zone 100 and the second absorption zone 200 of the absorbent layer 4 are respectively provided with a first slit 5 and a second slit 6 which do not contain absorbent materials, and the top sheet 2 and the bottom sheet 3 are compositely connected at the first slit 5 and the second slit 6, so as to encapsulate the polymer water-absorbent resin particles and prevent excessive polymer water-absorbent resin particles from leaking to the first slit 5 and the second slit 6. When in use, liquid is absorbed by the absorbent material 40, and the polymer water-absorbent resin particles in the absorbent material 40 absorb liquid and swell, so that a guide channel is formed at the first slit 5 and the second slit 6, and the excess liquid is guided to flow along the guide channel with good guide effect, thereby improving the diffusivity and absorption efficiency of the core body 1; at the same time, the wood pulp fibers contained in the absorbent material 40 can fix the high The molecular water-absorbing water-quality particles are prevented from running, and the wood pulp fibers help to guide the liquid to seep downward, thereby improving the utilization rate of the high-molecular water-absorbing resin particles and increasing the absorption amount; the first absorption area 100 of the absorption layer 4 is provided with at least two first slits 5 that do not contain absorbent material 40 at intervals along the longitudinal direction, and the second absorption area 200 of the absorption layer 4 is provided with at least two second slits 6 that do not contain absorbent material 40 at intervals along the longitudinal direction, which improves the bending property of the core body 1, and can better fit the skin when used, and can provide a certain strength support to avoid looseness after absorbing liquid. In this way, under the same area, the distribution area of ​​the slits can be reduced to ensure the volume of the absorbent material, thereby increasing the absorption amount and diffusion effect, and the setting of the arc portion can better improve the lateral diffusion effect of the liquid.

[0034] In this embodiment, the first slit 5 and the second slit 6 located in the crotch area 103 and the front waist area 101 each have two straight portions 201, and the first slit 5 and the second slit 6 located in the crotch area 103 each have an arc portion 202. Of course, the first slit 5 and the second slit 6 located in the crotch area 103 and the front waist area 101 each have one straight portion 201, and the first slit 5 and the second slit 6 located in the crotch area 103 each have two arc portions 202, and the straight portions 201 are distributed between the arc portions 202. Figure 4 shown.

[0035] At the same time, the longitudinal middle parts of the left edge 43 and the right edge 44 of the absorption layer 4 are both recessed inwardly with a clearance groove 7, and the clearance groove 7 is located at the user's crotch to facilitate the movement of the legs and improve the fit and comfort of use. Embodiment 2

[0036] refer to Figure 5 and Figure 6 As shown, the difference from the first embodiment is that the guide channel is also distributed in the back waist area 102, and the first slit 5 and the second slit 6 are symmetrically distributed along the longitudinal center axis b of the core body 1, so that more guide channels are formed and the distribution area is wider, thereby improving the diffusion and absorption efficiency of the core body 1. Embodiment 3

[0037] refer to Figure 7 As shown, the difference between it and the second embodiment is that: the arc portion 202 is omitted, and the first absorption zone 100 of the absorption layer 4 is provided with three first slits 5 without absorbent material 40 at intervals along the longitudinal direction, and the second absorption zone 200 of the absorption layer 4 is provided with three second slits 6 without absorbent material 40 at intervals along the longitudinal direction. At the same time, the first slit 5 and the second slit 6 located in the crotch area 103 and the front waist area 101 both have a straight line portion 201, and the straight line portion 201 of the first slit 5 in the crotch area 103 and the straight line portion 201 of the first slit 5 in the front waist area 101 are not located on the same straight line c parallel to the transverse central axis a, and the straight line portion 201 of the second slit 6 in the crotch area 103 and the straight line portion 201 of the second slit 6 in the front waist area 101 are not located on the same straight line d parallel to the transverse central axis a of the core body 1; refer to Figure 8 As shown, of course, the first absorption area 100 of the absorption layer 4 may be provided with six first slits 5 without absorbent material 40 at intervals along the longitudinal direction, and the second absorption area 200 of the absorption layer 4 may be provided with six second slits 6 without absorbent material 40 at intervals along the longitudinal direction, and the number of the first slits 5 and the second slits 6 may be even greater, thereby improving the bendability of the core body 1, allowing it to better fit the skin during use, and at the same time providing a certain strength support to avoid loosening after absorbing liquid.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An absorbent core with high diffusivity, comprising a core body, characterized in that: The core body is defined as having 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 being 5 cm to 80 cm, the core body having a front waist region, a rear waist region and a crotch region distributed in sequence along the longitudinal direction, the core body having a first absorption region located on one transverse side of the transverse central axis and a second absorption region located on the other transverse side of the transverse central axis, the core body comprising a top sheet, a bottom sheet and an absorption layer distributed between the top sheet and the bottom sheet, the gram weight of the top sheet and the bottom sheet being 5 gsm to 30 gsm; The absorption layer has a front edge and a rear edge distributed at both ends in the longitudinal direction and a left edge and a right edge distributed at both ends in the transverse direction, the absorption layer includes an absorption material, the absorption material includes at least 30% by weight of polymer water-absorbing resin particles, the average gram weight of the polymer water-absorbing resin particles is 0.1g / m² to 20g / m², the first absorption zone of the absorption layer is provided with at least two first slits free of absorption material at intervals in the longitudinal direction, and the second absorption zone of the absorption layer is provided with at least two second slits free of absorption material at intervals in the longitudinal direction; The top sheet and the back sheet are compositely connected at the first slit and the second slit. When the absorbent material swells, a guide channel is formed at the first slit of the first absorption zone and the second slit of the second absorption zone. The guide channel is distributed in the crotch area and / or the front waist area.

2. The absorbent core with high diffusivity according to claim 1, characterized in that: The guide channels are also distributed in the rear waist area.

3. The absorbent core with high diffusivity according to claim 1, characterized in that: There is absorbent material between the front ends of the first slit and the second slit and the front edge, and there is absorbent material between the rear ends of the first slit and the second slit and the rear edge.

4. The absorbent core with high diffusivity according to claim 1, characterized in that: The longitudinal middle parts of the left edge and the right edge of the absorption layer are both inwardly concavely provided with a clearance groove.

5. The absorbent core with high diffusivity according to any one of claims 1 to 4, characterized in that: The first slit and the second slit located in the crotch area and the front waist area both have straight line portions, the straight line portion of the first slit in the crotch area and the straight line portion of the first slit in the front waist area are not located on the same straight line parallel to the transverse central axis, and the straight line portion of the second slit in the crotch area and the straight line portion of the second slit in the front waist area are not located on the same straight line parallel to the transverse central axis of the core body.

6. The absorbent core with high diffusivity according to claim 5, characterized in that: The longitudinal length dimension of the straight portion of the first slit located in the crotch region is greater than the longitudinal length dimension of the straight portion of the first slit located in the front waist region.

7. The absorbent core with high diffusivity according to claim 6, characterized in that: The first slit and the second slit are symmetrically distributed along the transverse center axis of the core body.

8. The absorbent core with high diffusivity according to claim 7, characterized in that: The first slit and the second slit located in the crotch area both have an arc-shaped portion.

9. The absorbent core with high diffusivity according to any one of claims 1 to 4, characterized in that: The first slit and the second slit located in the crotch area and the front waist area each have at least two straight line portions, and the first slit and the second slit located in the crotch area each have an arc portion, and the arc portion is distributed between the two straight line portions.

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