CN112603659B

CN112603659B - Absorbent core, absorbent core body and preparation method and application of absorbent core body

Info

Publication number: CN112603659B
Application number: CN202011601766.7A
Authority: CN
Inventors: 朱威; 周彧峰; 彭海燕; 邹开东; 许飒; 林志平; 聂志强; 周峰; 张谭妹; 许欢欢
Original assignee: Lule Health Technology Co Ltd
Current assignee: Lule Health Technology Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2024-03-29
Anticipated expiration: 2040-12-29
Also published as: CN112603659A

Abstract

The invention discloses an absorption inner core, which comprises a first base layer, a plurality of first absorption bodies, a second base layer and a plurality of second absorption bodies, wherein the first absorption bodies are transverse strip-shaped absorption bodies, and the second absorption bodies are longitudinal strip-shaped absorption bodies; a plurality of first absorbers are fixed on the first base layer to form a first pre-core; a plurality of second absorbers are fixed on the second base layer to form a second pre-core; the first pre-core and the second pre-core are combined into a whole, and the plurality of first absorbers and the plurality of second absorbers are staggered and arranged transversely and longitudinally in sequence. The absorber in the absorption inner core is reasonably distributed, liquid is reasonably dredged and drained, and the conductivity is good. The invention also discloses an absorption core body, which has the advantages of high absorption speed, low reverse osmosis quantity, strong conductivity and high material utilization rate, and can not generate fault lump formation phenomenon in the use process. The invention also discloses a preparation method of the absorbent core, which has simple flow and is suitable for industrial production. The present invention also applies the absorbent core to sanitary articles.

Description

Absorbent core, absorbent core body and preparation method and application of absorbent core body

Technical Field

The invention relates to the technical field of sanitary products, in particular to an absorption inner core, an absorption core body, a preparation method of the absorption core body and application of the absorption core body.

Background

Disposable absorbent sanitary articles typically consist of several layers of different functions, such as a top layer, a bottom layer and an absorbent core between them, and even further layers may be provided. Of these hierarchical structures, the most important structure is the absorbent core. The absorbent cores of disposable absorbent sanitary articles currently on the market mainly comprise the following types: the first type is an absorbent core formed by mixing wood pulp fibers and high-molecular water-absorbent resin, and the absorbent core has better repeated absorption performance and better diffusion performance; the second type is a composite absorption core mixed by wet-strength paper, hot air fluffy cloth and high polymer water-absorbing resin, which is thinner than the first type absorption core, and meanwhile, the paper diaper can not have the condition of lump formation and fault in the use process; and thirdly, three-dimensional wrapping is carried out to form a core body, namely an absorption core formed by compounding high polymer water-absorbing resin and non-woven fabrics through hot melt adhesives, wherein the thickness of the absorption core is thinner than that of the absorption core of the second type.

However, the three existing types of absorbent cores have the following drawbacks, respectively:

(1) The first type of absorbent core is a mixture of wood pulp fibers and high-molecular water-absorbing resin, so that the disposable sanitary product is thicker, relatively moist and sultry in the use process, and lump-forming faults can exist in the use process;

(2) The second type of absorbent core has poor multiple absorption capacity and insufficient diffusion length, so that the utilization rate of the high polymer water-absorbent resin is low;

(3) The third category of absorbent cores, the rate of first absorption, is relatively poor and there is a risk of liquid leakage when applied to disposable sanitary products.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the purposes of the invention is to provide an absorption inner core, wherein the absorber is reasonably distributed, liquid is reasonably dredged and drained, and the conductivity is good.

The second purpose of the invention is to provide an absorbent core which has reasonable structure, high absorption speed, low reverse osmosis quantity, strong conduction capacity and high material utilization rate, and can not generate fault and lump formation during the use process.

The invention further aims to provide a preparation method of the absorbent core, which is simple in process flow and suitable for industrial production.

A fourth object of the present invention is to apply the absorbent core in a sanitary article.

One of the purposes of the invention is realized by adopting the following technical scheme:

an absorbent core comprises a first base layer, a plurality of first absorbers, a second base layer and a plurality of second absorbers, wherein the first absorbers are all transverse strip-shaped absorbers, and the second absorbers are all longitudinal strip-shaped absorbers; a plurality of first absorbers are fixed on the first base layer to form a first pre-core; a plurality of second absorbers are fixed on the second base layer to form a second pre-core; the first pre-inner core and the second pre-inner core are vertically combined into a whole, and the plurality of first absorbers and the plurality of second absorbers are transversely and longitudinally staggered in sequence.

Further, first wrapping folding parts are arranged at two ends of the first base layer in the length direction, and the first wrapping folding parts are downwards wrapped to completely cover the bottom surface of the second base layer; alternatively, a bottom surface portion of the second base layer is covered by the first wrap fold; the first wrap fold forms a closed loop end with an end of the second base layer.

Further, the water absorption rate of the first absorber is not equal to the water absorption rate of the second absorber.

Further, the first base layer is divided into a left side area, a middle area and a right side area along the length direction of the first base layer; a plurality of first absorbers are arranged on the left side region, the middle region and the right side region; the first absorbers are arranged in a plurality of rows on the left side area, and the number of the first absorbers on each row is greater than or equal to 1; the first absorbers are arranged in a plurality of rows on the right side area, and the number of the first absorbers on each row is greater than or equal to 1; the first absorbers are arranged in a plurality of rows in the middle area, and the number of the first absorbers on each row is 1;

dividing the second base layer into an upper side region, a central region and a lower side region along the width direction of the second base layer; a plurality of second absorbers are arranged on the upper side area and the lower side area; the second absorbers are arranged in a plurality of rows on the upper side area, and the number of the second absorbers on each row is greater than or equal to 1; the second absorbers are arranged in a plurality of rows on the lower side area, and the number of the second absorbers on each row is greater than or equal to 1.

Further, for the first base layer, two adjacent rows of first absorbers on the left side region, wherein the number of the first absorbers in one row is denoted as a, the number of the first absorbers in the other row is denoted as B, and a is equal to or not equal to B; two adjacent rows of first absorbers on the right side area, wherein the number of the first absorbers in one row is marked as C, the number of the first absorbers in the other row is marked as D, and the number of the first absorbers in the other row is equal to or different from D;

for the second base layer, two adjacent rows of second absorbers on the upper side region, wherein the number of the second absorbers on one row is denoted as E, and the number of the second absorbers on the other row is denoted as F, and E is equal to or different from F; and two adjacent rows of second absorbers on the lower side area, wherein the number of the second absorbers on one row is denoted as G, the number of the second absorbers on the other row is denoted as H, and G is equal to or different from H.

Further, the first absorber and the second absorber are each composed of polymer resin particles.

The second purpose of the invention is realized by adopting the following technical scheme:

an absorbent core comprising the absorbent core, and further comprising a flow guiding layer, a conductive layer and a substrate; the diversion layer, the absorption inner core, the conducting layer and the base material are sequentially stacked up and down.

Further, second wrapping folding parts are arranged at two ends of the base material in the length direction, and the second wrapping folding parts are folded upwards to completely cover the top surface of the absorption inner core; alternatively, the top surface portion of the absorbent core is covered by the second wrapper fold; the second wrap fold forms a closed loop end with the end of the absorbent core.

Further, the flow guide layer is a fluffy non-woven fabric layer or a foam layer; the conductive layer is a wood pulp fiber layer; the base material is hydrophilic non-woven fabric; for the absorbent core, the first base layer and the second base layer are hydrophilic nonwoven fabrics, and the first absorber and the second absorber are both composed of polymer resin particles.

Further, the width of the conductive layer is equal to or smaller than the width of the absorbent core, and more preferably, the width of the conductive layer does not exceed the width of the polymer resin layer.

Further, the conductive layer is arranged in a tiled structure or in a longitudinal strip arrangement structure. I.e., the conductive layer may be a tiled structure of wood pulp fibers, or a longitudinal stripe structure of wood pulp fibers.

The third purpose of the invention is realized by adopting the following technical scheme:

a method of making an absorbent core comprising:

the manufacturing steps of the absorption inner core are as follows: fixing a plurality of first absorbers on the first base layer to form a first pre-core; fixing a plurality of second absorbers on the second base layer to form a second pre-core; the first pre-inner core and the second pre-inner core are vertically combined into a whole, so that a plurality of first absorbers and a plurality of second absorbers are transversely and longitudinally staggered in sequence; the left end and the right end of the length direction of the first base layer are wrapped and folded towards the second pre-core to form an absorption core;

and (3) composite forming: arranging a conductive layer on the base material, placing the absorption inner core on the conductive layer, and wrapping and folding the left and right ends of the length direction of the base material towards the absorption inner core to form a pre-absorption core body; and arranging a flow guide layer on the pre-absorption core body to obtain the absorbent core.

The fourth purpose of the invention is realized by adopting the following technical scheme:

the absorbent core of the present invention is used in sanitary articles including infant diapers, pull-up pants, sanitary napkins, menstrual pants, adult diapers, incontinence pants and urine insulating pads.

Compared with the prior art, the invention has the beneficial effects that:

(1) The absorbent core provided by the invention comprises the first absorbent body and the second absorbent body, wherein the first absorbent body and the second absorbent body are transversely and longitudinally staggered, the distribution mode is reasonable, and liquid can be dredged, drained and conducted along the fixed-point distribution of the absorbent bodies so as to be gradually absorbed. Gaps are formed between two adjacent absorbers, and can serve as diversion channels of liquid to further improve the liquid absorption speed.

(2) The upper layer of the absorption core body provided by the invention is the diversion layer, so that the diversion speed is high; the middle layer is an absorption inner core, and the absorption bodies of the absorption inner core are transversely and longitudinally staggered, so that liquid can be continuously and gradually absorbed in the absorption bodies; the lower layer is made of a conductive layer, so that the transverse and longitudinal diffusion performance of the urine in the use process of the absorption core body can be improved, uniform diffusion is achieved, and the utilization rate of the absorption core body is improved. The conductive layer is not added with macromolecule water-absorbent resin, and the phenomena of fault and lump formation can not occur in the wearing and using process. The absorbent core has reasonable structure, high liquid absorption speed, strong conductivity, no concentration of liquid at the lower permeation starting point, uniform diffusion and low rewet.

(3) The preparation method of the absorbent core provided by the invention has simple and convenient process flow and is suitable for industrial production.

Drawings

FIG. 1 is a schematic view of an absorbent core according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of a first pre-core provided in an embodiment of the present invention;

FIG. 3 is a schematic illustration of a second pre-core provided in an embodiment of the present invention;

FIG. 4 is a schematic illustration of a first pre-core and a second pre-core according to an embodiment of the present invention after being combined;

FIG. 5 is a schematic view of an absorbent core according to an embodiment of the present invention;

fig. 6 is a schematic view of an absorbent core provided in comparative example 3 of the present invention.

In the figure: 10. a first base layer; 11. a first wrap fold; 20. a second base layer; 30. an intermediate absorbent layer; 31. a first absorber; 32. a second absorber; 33. an absorbent core; 40. a flow guiding layer; 50. a conductive layer; 60. a substrate; 61. a second wrapping fold; 101. a first hydrophilic high molecular water-absorbing resin fixing layer; 102. a first layer of a high molecular water-absorbing resin; 103. a second layer of a high molecular water-absorbing resin; 104. a second hydrophilic high molecular water-absorbing resin fixing layer; 1041. wrapping the fold.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments. The raw materials, equipment, etc. used in the following examples are available in a purchase manner except for special restrictions.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly. Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In the embodiment of the present invention, the transverse direction is the width direction, and the longitudinal direction is the length direction. Taking the application of the absorbent core or the absorbent core in the diaper as an example, the direction from the front waist to the rear waist of the diaper is the length direction, and the direction between the two leg penetrating holes is the width direction.

As shown in fig. 1 to 4, an absorbent core 33 includes a first base layer 10, a plurality of first absorbent bodies 31, a second base layer 20, and a plurality of second absorbent bodies 32, wherein the plurality of first absorbent bodies 31 are each a transverse strip-shaped absorbent body, and the plurality of second absorbent bodies 32 are each a longitudinal strip-shaped absorbent body; a plurality of first absorbers 31 are fixed on the first base layer 10 to form a first pre-core; a plurality of second absorbent bodies 32 are secured to the second base layer 20 to form a second pre-core; the first pre-core and the second pre-core are vertically combined into a whole, and the plurality of first absorbers 31 and the plurality of second absorbers 32 are staggered and arranged transversely and longitudinally in sequence.

As shown in fig. 2, which is a schematic plan view of the first pre-core, the first absorbent bodies 31 distributed in a transverse stripe shape are fixedly arranged on the first base layer 10; fig. 3 is a schematic plan view of a second pre-core, with longitudinally striped second absorbent bodies 32 fixedly disposed on the second substrate 20. In the process of manufacturing, a hot melt adhesive may be applied to the first base layer 10, and then the first absorbent 31 is fixed on the first base layer 10 according to a preset arrangement manner to form a first pre-core; next, applying a hot melt adhesive to the second base layer 20, and then fixing the second absorbent 32 to the second base layer 20 in a predetermined arrangement to form a second pre-core; next, the first pre-core and the second pre-core may be combined into one body by hot melt adhesive, and since the first absorbent body 31 and the second absorbent body 32 are arranged in a staggered manner, as shown in fig. 1 and 4, the first absorbent body 31 and the second absorbent body 32 are staggered and do not overlap each other after the first pre-core and the second pre-core are combined, i.e., the first absorbent body 31 and the second absorbent body 32 together form an intermediate absorbent layer 30, and the intermediate absorbent layer 30 is sandwiched between the first base layer 10 and the second base layer 20. At the same time, gaps are formed between the absorber and the absorber, and the gaps can serve as diversion channels for liquid.

The absorbent core 33 provided by the embodiment of the invention comprises the first absorbent body 31 and the second absorbent body 32, wherein the first absorbent body 31 and the second absorbent body 32 are transversely and longitudinally staggered, the distribution mode is reasonable, and liquid can be dredged, drained and conducted along the fixed-point distribution of the absorbent bodies so as to be gradually absorbed. Gaps are formed between two adjacent absorbers, and can serve as diversion channels of liquid to further improve the liquid absorption speed.

Further, as shown in fig. 1, both ends of the first base layer 10 in the length direction are provided with first wrap folds 11, and the first wrap folds 11 wrap down to completely cover the bottom surface of the second base layer 20; alternatively, the bottom surface portion of the second base layer 20 is covered by the first pack folding portion 11; the first wrap fold 11 forms a closed loop with the end of the second substrate 20. During manufacturing, the first wrapping and folding part 11 on the first base layer 10 can be wrapped towards the second base layer 20 through the wrapping and folding mechanism to form a closed loop structure, namely, the peripheral edges of the absorbent core are subjected to closed loop process treatment, so that the first absorbent body 31 and the second absorbent body 32 clamped between the first wrapping and folding part and the second base layer are prevented from leaking outwards, a three-dimensional wrapping and folding absorbent core structure is formed, and the overall stability is high. As shown in fig. 1, the first wrap fold 11 is folded down to completely cover the bottom surface of the second base layer 20, which can prevent the leakage of the absorbent body and save materials. Of course, the second wrapping fold 61 may be extended to completely wrap the bottom surface of the second base layer 20, and the full wrapping type further improves the wrapping ability to prevent the leakage of the absorbent body to the maximum extent. And the first wrap fold 11 and the end of the second substrate 20 are closed loop treated to act as the last barrier to liquid absorption, preventing liquid from spilling.

Further, the water absorption rate of the first absorber 31 is not equal to that of the second absorber 32. Preferably, the first absorbent body 31 has a higher water absorption rate than the second absorbent body 32, that is, the transverse strip absorbent body has a higher water absorption rate than the longitudinal strip absorbent body. As shown in fig. 4, for the intermediate absorbent layer 30, the central region is a lateral stripe-shaped absorbent body, and the absorbent body in the intermediate region can still maintain a certain absorption amount in a plurality of absorption times; meanwhile, liquid can be diffused towards the longitudinal direction at the initial liquid seepage point under the action of pressure, as shown in fig. 4, the upper side and the lower side of the transverse strip-shaped absorber in the middle area are longitudinal strip-shaped absorbers, and the left side and the right side of the transverse strip-shaped absorber are transverse strip-shaped absorbers.

Further, as shown in fig. 2, the first base layer 10 is divided into a left side region, a middle region and a right side region along the length direction of the first base layer 10, respectively; a plurality of first absorbers 31 are arranged on the left side region, the middle region and the right side region; the first absorbers 31 are arranged in a plurality of rows on the left side area, two adjacent rows of the first absorbers 31, wherein the number of the first absorbers 31 in one row is denoted as A, the number of the first absorbers 31 in the other row is denoted as B, and the A is equal to or not equal to the B; the first absorbers 31 are arranged in a plurality of rows on the right side area, two adjacent rows of the first absorbers 31, wherein the number of the first absorbers 31 in one row is denoted as C, and the number of the first absorbers 31 in the other row is denoted as D, and C is equal to or different from D; the first absorbers 31 are arranged in a plurality of columns in the middle region, and the number of the first absorbers 31 on each column is 1. For example, 15 columns of the first absorbent 31 may be provided in the left side region of the first base layer 10, only one first absorbent 31 may be provided in the 1 st column near the extreme end, 4N absorbers may be provided in the adjacent second column, 3N absorbers may be provided in the adjacent third column, and then the subsequent columns may be sequentially provided in accordance with the 4N and 3N absorbers; 16 rows of first absorbers 31 may be disposed in the right side region of the first base layer 10, only one first absorber 31 is disposed in the 1 st row near the extreme end, 4M absorbers are disposed in the adjacent second row, 3M absorbers are disposed in the adjacent third row, and then the next rows are sequentially disposed in accordance with the 4M and 3M absorbers; n and M are integers greater than or equal to 1. For the middle region of the first base layer 10, the number of the absorbent bodies in each row is 1, and after absorbing the liquid, the liquid first permeates down at the first absorbent body 31 in the middle region and then rapidly spreads in the left-right direction. The arrangement of the first absorbent bodies 31 on the first base layer 10 is only exemplified, and the number of the first absorbent bodies 31 on the left side region, the middle region, and the right side region is set according to the actual situation. The first absorber 31 is preferably a rectangular absorber, and the length and width thereof are set according to actual conditions.

As shown in fig. 3, the second base layer 20 is divided into an upper side region, a central region, and a lower side region along the width direction of the second base layer 20, respectively; a plurality of second absorbers 32 are provided on both the upper side region and the lower side region; the second absorbers 32 are arranged in a plurality of rows on the upper side region, two adjacent rows of the second absorbers 32, wherein the number of the second absorbers 32 in one row is denoted as E, the number of the second absorbers 32 in the other row is denoted as F, and E is equal to or different from F; the plurality of second absorbers 32 are arranged in a plurality of rows on the lower side region, two adjacent rows of second absorbers 32, wherein the number of the second absorbers 32 in one row is denoted as G, the number of the second absorbers 32 in the other row is denoted as H, and G is equal to or different from H. For example, 4 rows of the second absorbers 32 may be provided in the upper region of the second base layer 20, only one second absorber 32 is provided near the topmost 1 st row, 13X absorbers are provided in the adjacent second row, 7X absorbers are provided in the adjacent third row, and then the next rows are sequentially provided in the order of 4X and 3X absorbers; 4 rows of second absorbers 32 may be disposed in the lower side region of the second base layer 20, only one second absorber 32 is disposed in the 1 st row near the extreme end, 13Y absorbers are disposed in the adjacent second row, 7Y absorbers are disposed in the adjacent third row, and then the next rows are sequentially disposed according to the 13Y and 7Y absorbers; x and Y are integers of 1 or more. The arrangement of the second absorbers 32 on the second base layer 20 is merely by way of example, and the number of the arrangement rows of the second absorbers 32 on the upper region, the central region, and the lower region, and the number of the second absorbers 32 on each row needs to be set according to the actual situation. The second absorber 32 is preferably a rectangular absorber, and its length and width are set according to actual conditions.

In the absorbent core 33 provided in the embodiment of the present invention, since the liquid absorption speed of the first absorbent body 31 is greater than that of the second absorbent body 32, after absorbing the liquid, the liquid first permeates down at the first absorbent body 31 in the middle area of the first base layer 10, and then rapidly diffuses toward the first absorbent body 31 in the left-right direction, and the second absorbent bodies 32 located at the upper and lower sides absorb water at a slower speed, so that the liquid is more conducted and absorbed in the front-rear direction, and the middle area is kept to be dry and comfortable.

Further, the first absorber 31 and the second absorber 32 are each composed of polymer resin particles. That is, the first absorbent body 31 is a first SAP absorbent body, the second absorbent body 32 is a second SAP absorbent body, and the polymer resin particles can be obtained by purchase. The water absorption speed of the first SAP absorber is greater than that of the second SAP absorber, and the polymer resins can be purchased from different manufacturers, and then the polymer resins from different manufacturers are used as the first absorber 31 and the second absorber 32, respectively, and of course, the polymer resins from different models of the same manufacturer can also be purchased. Alternatively, the components of the first absorber 31 and the second absorber 32 are adjusted so that the components are not uniform, thereby achieving the effect of different water absorption rates. In making, the first SAP absorber may be transferred to the first base layer 10 by a roll-to-roll transfer process, the second SAP absorber is transferred to the second base layer 20, and the absorber and base layer may be fixed by a hot melt adhesive. In actual manufacturing, the middle absorbent layer 30 of the absorbent core 33 is transferred in two layers, that is, a first pre-core is formed by transferring the first absorbent body 31 through one roller, a second pre-core is formed by transferring the second absorbent body 32 through the other roller, and then the first pre-core and the second pre-core are combined into a whole. The grammage of the first absorbent 31 and the second absorbent 32 may be set between 100 and 300gsm, in which range the product has good absorption properties and is soft and comfortable.

As a preferred embodiment, the first base layer 10 and the second base layer 20 are provided as hydrophilic nonwoven fabrics, specifically may be provided as hydrophilic spunbond nonwoven fabrics, and for the improvement of production efficiency, the first base layer 10 nonwoven fabrics and the second base layer 20 nonwoven fabrics are provided as at least 15gsm or more, and also the product quality can be ensured to be good.

As shown in fig. 5, an absorbent core comprising an absorbent core 33, further comprising a baffle 40, a conductive layer 50, and a substrate 60; the flow guiding layer 40, the absorbent core 33, the conductive layer 50, and the base material 60 are stacked one on top of the other in this order. After the absorbent core absorbs liquid, the liquid is gradually absorbed and diffused by passing through the flow guiding layer 40, then the absorbent core 33, and then the conductive layer 50.

Further, as shown in fig. 5, both ends in the longitudinal direction of the base material 60 are provided with second wrapping folds 61, and the second wrapping folds 61 are folded upward to completely cover the top surface of the absorbent core 33; alternatively, the top surface portion of the absorbent core 33 is covered by the second wrapping fold 61; the second wrapper fold 61 forms a closed loop end with the end of the absorbent core 33. The second wrapping fold 61 wraps around both the conductive layer 50 and the absorbent core 33, ensuring structural stability. I.e., the substrate layer is the fixed wrap layer of the conductive layer 50 and the absorbent core 33.

Further, the diversion layer 40 is a fluffy non-woven fabric layer or a foam layer, and the diversion layer 40 needs to have a certain thickness, and the thickness needs to be kept to be greater than 1mm under the action of 50N pressure, so that the discomfort of the infant caused by the granular sense of the high polymer water-absorbent resin can be avoided when the crotch and the buttocks of the infant are used with the disposable sanitary article in the use process. Specifically, the air guide layer 40 may be provided as a hot air fluffy non-woven fabric layer, and the hot air non-woven fabric may be subjected to fluffing treatment by a fluffing process.

In a preferred embodiment, the conductive layer 50 is a layer of wood pulp fibers that has good liquid storage and liquid diffusion capabilities. The wood pulp fiber layer is not mixed with high polymer resin, so that the phenomenon of lump formation and fault formation in the using process can be avoided. The width of the wood pulp fiber conductive layer 50 is not preferably larger than the width of the middle absorbent layer 30 of the absorbent core 33, and if the width of the wood pulp fiber conductive layer 50 exceeds the width of the polymer absorbent resin layer, the liquid in the wood pulp fiber is squeezed out under pressure to cause wetness, and the width of the wood pulp fiber conductive layer 50 is smaller than the width of the polymer absorbent resin layer, this problem is avoided. Preferably, the gram weight of the wood pulp fiber is 80-120 g/square meter, so that the product has good liquid absorption and storage capacity, and is soft and comfortable. In addition, the conductive layer 50 may be arranged in a tiled configuration, or may be arranged in a longitudinal stripe configuration, i.e., the conductive layer 50 may be in a tiled configuration of wood pulp fibers, or in a longitudinal stripe configuration of wood pulp fibers.

In a preferred embodiment, the substrate 60 is a hydrophilic nonwoven fabric, and specifically, a material such as a spunbond nonwoven fabric or a hot air nonwoven fabric may be selected. For the absorbent core 33, the first base layer 10 and the second base layer 20 are both hydrophilic nonwoven fabrics, and the first absorber 31 and the second absorber 32 are each composed of polymer resin particles.

A method of making an absorbent core comprising:

manufacturing steps of the absorbent core 33: fixing a plurality of first absorbers 31 on the first base layer 10 to form a first pre-core; securing a plurality of second absorbent bodies 32 to the second base layer 20 to form a second pre-core; the first pre-core and the second pre-core are combined into a whole up and down, so that a plurality of first absorbers 31 and a plurality of second absorbers 32 are staggered and arranged in sequence in the transverse direction and the longitudinal direction; wrapping and folding the left and right ends of the first base layer 10 in the longitudinal direction toward the second pre-core to form an absorbent core 33;

and (3) composite forming: arranging a conductive layer 50 on a base material 60, arranging an absorbent core 33 on the conductive layer 50, and wrapping and folding the left and right ends of the base material 60 in the length direction towards the absorbent core 33 to form a pre-absorbent core body; and arranging a diversion layer 40 on the pre-absorption core body.

As a preferred embodiment, the absorbent core is inter-layer composite between materials mainly by means of hot melt adhesives. Firstly, crushing wood pulp sheets into wood pulp fibers by a crushing device, passing through a forming drum device, forming a wood pulp fiber layer structure by negative pressure adsorption, and transferring the wood pulp fiber layer structure to a base material 60 sprayed with hot melt adhesive by a transferring device; then, the absorbent core 33 is subjected to wrap molding to form a pre-absorbent core. Finally, the pre-absorbent core is bonded to the upper baffle 40 by hot melt adhesive.

The embodiment of the invention applies the absorbent core to sanitary articles, including infant diapers, pull-up pants, sanitary napkins, menstrual pants, adult diapers, incontinence pants and urine isolation pads.

Example 1

As shown in fig. 5, an absorbent core includes a baffle 40, an absorbent core 33, a conductive layer 50, and a substrate 60. The diversion layer 40 is a hot air fluffy cloth layer; the absorbent core 33 comprises a first hydrophilic base layer, a second hydrophilic base layer and an intermediate absorbent layer 30 clamped between the first hydrophilic base layer and the second hydrophilic base layer, wherein the two end parts of the first hydrophilic base layer are wrapped by the second hydrophilic base layer and form a closed loop structure with the end parts of the second hydrophilic base layer, the intermediate absorbent layer 30 is composed of macromolecule resin strips which are transversely and longitudinally staggered, specifically, a central area is a macromolecule resin strip which is transversely and longitudinally distributed in a strip shape, the left side and the right side of the central area are macromolecule resin strips which are transversely and longitudinally distributed in a strip shape, and the upper side and the lower side of the central area are macromolecule resin strips which are longitudinally and longitudinally distributed in a strip shape, and the water absorption speed of the transverse strip macromolecule resin strips is higher than that of the longitudinal strip macromolecule resin strips; conductive layer 50 is a wood pulp fiber layer; the base material 60 is a hydrophilic fiber layer, and two ends of the base material 60 are bent upwards to wrap the conducting layer 50 and the absorption inner core 33, and a closed loop structure is formed by the end of the conducting layer 50 and the end of the absorption inner core 33. The absorbent core of example 1 was prepared as follows:

breaking and defibrating the wood pulp raw material into raw pulp fibers, and arranging the raw pulp fibers on a base material 60 subjected to hot melt adhesive sizing; then, respectively carrying out hot melt glue application on the first hydrophilic base layer and the second hydrophilic base layer, fixing the transverse macromolecule absorbent resin on the first hydrophilic base layer, fixing the longitudinal macromolecule absorbent resin on the second hydrophilic base layer, and then coating and folding the hydrophilic base layers through a folding mechanism to form an absorbent core 33; next, the absorbent core 33 is disposed on the conductive layer 50, and both ends of the base layer are wrapped and folded to form a pre-absorbent core; finally, glue is applied to the pre-absorber by a hot melt glue gun, and a diversion layer 40 is arranged on the pre-absorber to form the final absorber core.

The specific materials used in example 1 are shown in table 1 below.

Table 1 example 1 material table of absorbent core

Note that: the transverse high polymer resin and the longitudinal high polymer resin come from different factories, and the water absorption speeds of the transverse high polymer resin and the longitudinal high polymer resin are not consistent.

Comparative example 1

The composite core body sequentially comprises six layers of structures from top to bottom: the novel dust-free paper comprises a first layer of dust-free paper, a first layer of high polymer water-absorbing resin, hot air fluffy cloth, a second layer of high polymer water-absorbing resin, a second layer of dust-free paper and a hydrophilic wrapping fixing layer, wherein the six layers of structures are combined into a whole through hot melt adhesive. Specific material information tables are shown in table 2 below.

Table 2 comparative example 1 material table of absorbent core

Comparative example 2

A traditional core body sequentially comprises a two-layer structure from top to bottom: the first layer of hot air hydrophilic coating layer, the second layer of high molecular water-absorbing resin and wood pulp fiber mixed layer are combined into a whole through hot melt adhesive. Specific material information tables are shown in table 3 below.

Table 3 comparative example 2 material table of absorbent core

Comparative example 3

As shown in fig. 6, a three-dimensional wrapping core body sequentially comprises four layers of structures from top to bottom: a first hydrophilic high molecular water absorbent resin fixing layer 101, a first high molecular water absorbent resin layer 102, a second high molecular water absorbent resin layer 103 and a second hydrophilic high molecular water absorbent resin fixing layer 104, both end parts of the second hydrophilic high molecular water absorbent resin fixing layer 104 forming wrapping folds 1041; the four layers of structures are combined into a whole through hot melt adhesive. Specific material information tables are shown in table 4 below.

Table 4 comparative example 3 material table of absorbent core

Effect testing

The absorbent cores obtained in example 1 and comparative examples 1 to 3 were each cut into rectangular test pieces 400mm long by 100mm wide, and the center line was used as the liquid injection point. A hollow cylindrical glass tube having an inner diameter of 60mm (outer diameter of 70mm, height of 100 mm) was placed on the liquid injection point, 80ml of 0.9% physiological saline was injected at the 0 th and 5 th min, respectively, and the time for which the liquid in the hollow cylinder was absorbed by the absorbent core was recorded as the 1 st absorption rate and the 2 nd absorption rate, respectively. And measuring the diffusion distance of the liquid in the core along the length direction of the core at the 4 th min and the 11 th min respectively; after 10min, 20g of filter paper (diameter 110 mm) was weighed and placed on the pouring point, and a weight of 1.2kg (diameter 90 mm) was placed on the filter paper, and the filter paper was pressurized for 1min, and the added weight of the filter paper was weighed and the added weight was the rewet amount. The test results are shown in table 5 below.

Table 6 table of results of the absorbent core performance test of example 1 and comparative examples 1-3

Project	Example 1	Comparative example 1	Comparative example 2	Comparative example 3
					Absorption speed/sec 1	10.24	12.16	11.14	23.04
Absorption rate/sec 2	12.37	12.34	31.16	8.15
					Reverse osmosis amount/g	0.21	1.83	4.24	0.24
Diffusion length of 1 st time/mm	276	207	172	282
					Diffusion length of 2 nd time/mm	307	220	204	323

As can be seen from the records in table 6, the absorbent core of example 1 gave good results in several indexes, namely, absorption rate, reverse osmosis amount and diffusion length, which are superior to comparative examples 1, 2 and 3. The absorbent core product of example 1 has reasonable overall structural arrangement, higher liquid absorption rate and excellent conductivity. The specific analysis is as follows:

the absorbent core provided in example 1 has a top layer structure of hot air fluffy nonwoven fabric, so that the absorbent core can maintain a certain stiffness under the action of pressure, and the liquid rewet amount is greatly reduced; compared with the traditional composite core body, the reverse osmosis amount after 3 times of liquid adding can be reduced by more than 50 percent. The macromolecular absorbent resin in the absorbent core 33 is arranged in a staggered manner in the transverse direction and the longitudinal direction, so that the liquid can be continuously and gradually absorbed in the macromolecular absorbent resin. By setting the macromolecule water-absorbent resin with different water absorption rates, the macromolecule in the middle area can still keep a certain absorption capacity in repeated absorption; simultaneously, the liquid can be longitudinally diffused at the initial liquid infiltration point under the action of pressure, and the longitudinal high polymer absorption speed is low, so that more liquid can be absorbed at the front side and the rear side, and the middle area is kept dry and comfortable to a certain extent. The wood pulp fiber conductive layer 50 can promote the transverse and longitudinal diffusion performance of urine in the use process of the absorbent core body, and can realize uniform diffusion, and the diffusion length of the absorbent core body is increased by 10% compared with that of the traditional composite core body after 3 times of liquid adding, so that the utilization rate of the absorbent core body is improved. The absorbent core of example 1 was more prone to absorb liquid after liquid had penetrated down during application, and the liquid had preferentially reached the underlying wood pulp fiber layer due to the tendency of the wood pulp fibers to absorb water and swell. Meanwhile, in the absorbent core of example 1, when the liquid passes through the region of the high molecular water absorbent resin layer, the liquid preferentially reaches the lower wood pulp fiber layer for diffusion conduction due to the capillary phenomenon of the lower wood pulp fiber layer. And after the wood pulp fiber at the lower layer is absorbed, the liquid is infiltrated and damaged at the same time, so that the high-molecular water-absorbent resin starts to absorb the liquid, and finally the utilization rate of the whole absorbent core is improved. And, the lower wood pulp fiber layer has a softer hand than a conventional composite core with wet strength paper as the bottom layer. The wood pulp fiber layer is fixed by hot melt adhesive only because no polymer water absorbent resin is added. Therefore, the phenomenon of fault and lump formation can not occur in the wearing and using process.

The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.

Claims

1. An absorbent core comprising a flow guiding layer, an absorbent core, a conductive layer and a substrate; the diversion layer, the absorption inner core, the conducting layer and the base material are sequentially stacked up and down;

the absorption inner core comprises a first base layer, a plurality of first absorption bodies, a second base layer and a plurality of second absorption bodies, wherein the first absorption bodies are transverse strip-shaped absorption bodies, and the second absorption bodies are longitudinal strip-shaped absorption bodies; a plurality of first absorbers are fixed on the first base layer to form a first pre-core; a plurality of second absorbers are fixed on the second base layer to form a second pre-core; the first pre-core and the second pre-core are vertically combined into a whole, and a plurality of first absorbers and a plurality of second absorbers are transversely and longitudinally staggered in sequence;

the first absorber and the second absorber are both composed of polymer resin particles; the water absorption speed of the first absorber is greater than that of the second absorber;

dividing the first base layer into a left side area, a middle area and a right side area along the length direction of the first base layer; a plurality of first absorbers are arranged on the left side region, the middle region and the right side region; the first absorbers are arranged in a plurality of rows on the left side area, and two adjacent rows of first absorbers, wherein the number of the first absorbers in one row is denoted as A, the number of the first absorbers in the other row is denoted as B, and the A is equal to or not equal to the B; the first absorbers are arranged in a plurality of rows on the right side area, and two adjacent rows of first absorbers, wherein the number of the first absorbers in one row is marked as C, the number of the first absorbers in the other row is marked as D, and the number of the first absorbers in the other row is equal to or different from the number of the first absorbers in the other row; the first absorbers are arranged in a plurality of rows in the middle area, and the number of the first absorbers on each row is 1;

dividing the second base layer into an upper side region, a central region and a lower side region along the width direction of the second base layer; a plurality of second absorbers are arranged on the upper side area and the lower side area; the second absorbers are arranged in a plurality of rows on the upper side area, two adjacent rows of the second absorbers, wherein the number of the second absorbers in one row is denoted as E, the number of the second absorbers in the other row is denoted as F, and E is equal to or different from F; the second absorbers are arranged in a plurality of rows on the lower side area, two adjacent rows of the second absorbers, wherein the number of the second absorbers in one row is marked as G, the number of the second absorbers in the other row is marked as H, and G is equal to or not equal to H;

the two ends of the first base layer in the length direction are provided with first wrapping folding parts, and the first wrapping folding parts are downwards wrapped to completely cover the bottom surface of the second base layer; alternatively, a bottom surface portion of the second base layer is covered by the first wrap fold; the first wrapping fold forms a closed loop with the end of the second base layer;

the two ends of the length direction of the base material are respectively provided with a second wrapping folding part, and the second wrapping folding parts are folded upwards to completely cover the top surface of the absorption inner core; alternatively, the top surface portion of the absorbent core is covered by the second wrapper fold; the second wrap fold forms a closed loop end with the end of the absorbent core.

2. The absorbent core of claim 1, wherein the flow-directing layer is a lofty nonwoven layer or a foam layer; the conductive layer is a wood pulp fiber layer; the base material is hydrophilic non-woven fabric; for the absorbent core, the first base layer and the second base layer are hydrophilic nonwoven fabrics, and the first absorber and the second absorber are both composed of polymer resin particles.

3. A method of making an absorbent core according to claim 1, comprising:

4. Use of the absorbent core of claim 2 in hygiene articles, including infant diapers, pull-up pants, sanitary napkins, menstrual pants, adult diapers, incontinence pants and urine insulation pads.