CN107397628B

CN107397628B - It is a kind of to have imbibition from the composite absorption core of expanded type liquid-conveying ducts and its application

Info

Publication number: CN107397628B
Application number: CN201710790670.1A
Authority: CN
Inventors: 荣敏杰; 田云; 许永升; 于庆华; 荣帅帅
Original assignee: Shandong Nuoer Biological Technology Co Ltd
Current assignee: Nuo Chen Co ltd
Priority date: 2016-09-10
Filing date: 2017-09-05
Publication date: 2018-10-16
Anticipated expiration: 2037-09-05
Also published as: CN109199701B; CN109551043A; CN109568012B; CN106361506A; CN107397628A; CN107625583A; CN208447937U; CN109199701A; WO2018045939A1; CN107625583B; CN109551043B; CN109568012A

Abstract

The invention discloses a kind of composite absorption cores, the composite absorption core includes surface layer, middle layer and bottom successively from top to bottom, the middle layer includes the water accepting layer made of the imbibition intumescent material expanded after absorption liquid, and imbibition self-expanding liquid-conveying ducts are provided in water accepting layer.The invention further relates to application of the composite absorption core in manufacture absorbent article especially paper diaper.The present invention composite absorption core have many advantages, such as it is dry-ness it is good, do not rise stick together, not discontinue, especially because the liquid-conveying ducts have imbibition self expandable characteristic so that composite absorption core or the absorbent article including the core also have many advantages, such as to blend that diffusion velocity is fast, returns milliosmolarity lacks under liquid.

Description

It is a kind of to have imbibition from the composite absorption core of expanded type liquid-conveying ducts and its application

Technical field

The present invention relates to composite absorption core fields, and in particular to a kind of to have imbibition from the compound of expanded type flow-guiding channel Absorptive core and its application.

Background technology

In the prior art, during composite absorption core generally comprises surface layer, bottom and is set between surface layer and bottom Interbed, and absorbent material is fixed on the surface of middle layer by modes such as bondings.When composite absorption core touches liquid When body, liquid reaches middle layer by surface layer, and the absorbent material being fixed on the intermediate layer is absorbed and kept, and plays absorption The effect of liquid.Therefore, the amount of absorptive core fluid-absorbing is determined by the amount and absorbent properties of absorbent material.This In structure, since absorbent material is typically distributed between surface layer and middle layer and between bottom and middle layer.But at this In kind structure, longtitudinal dispersion speed of the liquid from surface layer to bottom and the horizontal proliferation speed along composite absorption core surface Relatively slow, solution causes liquid excessive in local accumulation and leads to side leakage or flood stain.

In order to solve the problems, such as that longtitudinal dispersion speed is partially slow, CN201310359556.5 discloses a kind of composite absorbent core Body, including surface layer, bottom and the absorbent central layer being set between the surface layer and the bottom are opened on the absorbent central layer Equipped with multiple longitudinal perforation, hydroscopic high-molecular resin is filled in longitudinal perforation.But this composite absorption core is still So without solving the problems, such as that liquid horizontal proliferation speed is partially slow.

CN201310393117.6 discloses a kind of composite absorption core and paper diaper for inhaling function with wink, described compound Absorptive core absorbs water macromolecule layer, the middling speed water suction wood pulp cotton mixed layer and macromolecule layer that quickly absorbs water by full water conservancy diversion surface layer, at a slow speed Sequentially form.But the full water conservancy diversion surface layer of this composite absorption core is also the longtitudinal dispersion speed of accelerating liquid.

The amenities such as baby paper diaper are widely used at present, including compound core body this kind of paper diaper due to It is ultra-thin, not discontinue, therefore the market share is also constantly expanding, but the absorption system in the prior art for including composite absorption core There is also following defects for product such as paper diaper：(1) the multiple infiltration rate of existing composite absorption core type baby paper diaper is slow, There is leakage of urine phenomenon；(2) existing composite absorption core type paper diaper are after absorbing urine, due to be multilayer dust-free paper and Non-woven fabrics forms, and absorbent central layer expands after absorbing urine can make composite absorption core be hardened.

Invention content

(1) technical problems to be solved

The technical problem to be solved by the present invention is to solve composite absorption core infiltration rate is slow, after more, imbibition of returning milliosmolarity it is swollen It is swollen be hardened and expand lead to problems such as to wear caused by user.

(2) technical solution

In order to solve the above-mentioned technical problem, the present invention provides a kind of composite absorption with water conservancy diversion effect in first aspect Core.

The present invention additionally provides application of the composite absorption core in manufacturing absorbent article in second aspect.

(3) advantageous effect

Compared with prior art, it is had the following advantages that using the composite absorption core of the technology of the present invention：It is dry-ness good, no It rises and sticks together, not discontinue, do not expand and be hardened and to return milliosmolarity few.Because being provided with the liquid-conveying ducts of imbibition self-expanding, therefore inhaling There are significant guide functions after liquid, so liquid infiltration rate is fast, diffusion is also significantly better than general composite absorption core, It can be applied to various absorbent articles, especially amenities, especially disposable sanitary articles, such as sanitary napkin or paper urine For example ultra-thin baby paper diaper of trousers, baby diaper etc..

Description of the drawings

Fig. 1 is the structural schematic diagram of one embodiment of the composite absorption core of the present invention, and wherein composite absorption core is State before imbibition, and the position of liquid-conveying ducts is only may be seen indistinctly.

Fig. 2 is the sectional view of composite absorption core shown in FIG. 1.

Fig. 3 is the structural schematic diagram of another embodiment of the composite absorption core of the present invention, wherein composite absorption core For state before imbibition, but the width of the composite absorption core in the width of liquid-conveying ducts ratio Fig. 1 is big.

Fig. 4 be Fig. 1 composite absorption core imbibition after hydroscopic high-molecular resin expansion to form obviously drain Channel.

Fig. 5 is the sectional view of the composite absorption core in Fig. 4.

Fig. 6 is the sectional view of another embodiment of the composite absorption core of the present invention, and only there are one by macromolecule water uptake The water accepting layer that resin is formed, and there is no absorbent central layer.

Fig. 7 is the structural schematic diagram after the composite absorption core imbibition described in Fig. 6.

The sectional view of another embodiment of the composite absorption core of Fig. 8 present invention, has and is formed by hydroscopic high-molecular resin Upper water accepting layer and lower water accepting layer, but do not have absorbent central layer.

Fig. 9 is the structural schematic diagram after the composite absorption core imbibition described in Fig. 8.

Figure 10 to 15 is to be placed with to be parallel to a strip baffle in bottom layer length direction, perpendicular to bottom layer length respectively One strip baffle, multiple (3) strip baffles, S rows baffle, Z baffles and groined type baffle perpendicular to bottom layer length And the schematic diagram of the bottom upper surface of sprayed coating hot melt structure adhensive.

In figure：1：Surface layer；2：Upper water accepting layer；3：Absorbent central layer；4：Lower water accepting layer；5：Bottom；6：Liquid-conveying ducts；7：It is empty White area (region corresponding with liquid-conveying ducts for not being distributed hydroscopic high-molecular resin)

Specific implementation mode

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.

The present invention provides a kind of composite absorption core with water conservancy diversion effect, the composite absorption core in first aspect For five-layer structure, respectively surface layer, upper water accepting layer, absorbent central layer, lower water accepting layer and bottom from top to bottom；The upper water accepting layer And/or lower water accepting layer is equipped with liquid-conveying ducts at the middle part of whole picture composite absorption core width.

The present invention is not particularly limited the shape and size of composite absorption core, can be formed different as needed Shape and have required size.For example, for shape, composite absorption core can be for example cylinder, square, Cuboid is designed to tool and is of a variety of shapes according to actual needs.For ease of description, if without there is special theory It is bright, it will be hereafter described by taking rectangle sheet material as an example.Thickness, width and the length of sheet material can design as needed.

Surface layer about the composite absorption core and bottom do not indicate that surface layer is composite absorption core such as on the contrary The layer of side is penetrated into positioned at liquid, bottom is the layer of composite absorption core being located at the surface layer opposite side.For paper diaper Composite absorption core for, surface layer be close to body side layer, bottom be far from body side layer.

The present invention is not particularly limited the full width of the composite absorption core, can be set as needed, cuts out It cuts or splices.In some embodiments, the composite absorption core full width is 8cm to 15cm, and for example, 8cm is extremely 12cm, for example, 8,9,10,11,12,13 or 14cm.

The surface layer can be woven cloths or non-woven cloth.In some preferred embodiments, the woven cloths or The material of person's non-woven cloth can be made of fiber, and the fiber is selected from fine by polyethylene fibre, polypropylene fibre, polyvinyl chloride The group of dimension, polyester fiber, cellulose fibre, natural fiber or staple fibre composition.The non-woven cloth for example may be used The fiber is made for hot wind processing, hot rolling treatment, spunbond processing, spun lacing processing or air web moulding process；The weaving Cloth can be for example made up of method for weaving using the fiber.

The material of the bottom can be polyethylene film or polyvinyl chloride film.Preferably, the material of the bottom Material is ventilated membrane, for example, doped with the polyethylene breathable film of particles of inorganic material or polyvinyl chloride ventilated membrane.

The absorbent central layer can be woven cloths or non-woven cloth.In some preferred embodiments, described to knit Making the material of cloth or non-woven cloth can be made of fiber, and the fiber is selected from by polyethylene fibre, polypropylene fibre, polychlorostyrene The group of vinyl fiber, polyester fiber, cellulose fibre, natural fiber or staple fibre composition.The non-woven cloth for example may be used The fiber to be made using hot wind processing, hot rolling treatment, spunbond processing, spun lacing processing or air web moulding process；Institute Woven cloths are stated can be for example made up using the fiber of method for weaving.

In other preferred embodiment, the surface layer and/or bottom are that square grammes per square metre is 10g/m²To 90g/m² (such as 10,20,30,40,50,60,70 or 80g/m²Such as 10g/m²To 50g/m²), preferably 35g/m²To 55g/m²'s Spun-bonded non-woven fabrics or dust-free paper, or by polyethylene fibre, polypropylene fibre, polyvinyl chloride fibre, polyester fiber, natural or people One or more of cotton or cellulose fibre is made to be molded to be formed by hot wind, hot rolling, spun lacing, needle thorn, spunbond or air web Non-woven fabrics or textile cloth.

In other embodiments, the absorbent central layer is square grammes per square metre in 15g/m²To 80g/m²(such as 15,20, 25,30,35,40,45,50,55,60,65,70 or 75g/m²) loft non-woven cloth, for example, square grammes per square metre is in 35g/m²Extremely 50g/m²Loft non-woven cloth.In the case where absorbent central layer is loft non-woven cloth, the SAP for forming water accepting layer can before imbibition To be partially or entirely embedded in loft non-woven cloth, and can be tightly embedded in loft non-woven cloth after imbibition expansion, So as to maintain the shape of composite absorption core after imbibition, inhaled like that rather than composite absorption core in the prior art Reunion and tomography occurs since SAP particles are due to weight change etc. after liquid.The composite absorption core of the present invention is after imbibition It is able to maintain that the performance of shape is especially beneficial in the case where it is used for paper diaper, because if the reunion or tomography occurs Words can cause the discomfort of user to result even in compressing or friction with physical contact part.

In some preferred embodiments, the upper water accepting layer be 20 mesh to 120 mesh (be, for example, 20,40,60,80, 100 or 120 mesh) hydroscopic high-molecular resin (Super AbsorbentPolymer, SAP)；And/or the lower water accepting layer is 20 Mesh to 120 mesh (be, for example, 20,40,60,80,100 or 120 mesh) hydroscopic high-molecular resin.

Hydroscopic high-molecular resin used in this application is all known, and the present invention does not have the SAP that water accepting layer uses Special limitation, as long as can expand after absorption of liquid and form liquid-conveying ducts in the region of no distribution SAP.Example The hydroscopic high-molecular resin of various performances can be such as bought from Nore Bioisystech Co., Ltd of freezing as needed.

In other preferred embodiments, square grammes per square metre of the upper water accepting layer and/or lower water accepting layer can be 80g/m²To 300g/m²(it is, for example, 80,100,150,200,250 or 300g/m²).Also it is preferred that the upper water accepting layer The mesh number for the particle that the mesh number of SAP particles is 50% or more is distributed (D₅₀) in 25 mesh to 50 mesh ranges；The SAP of the lower water accepting layer The particle mesh number that the mesh number of particle is 80% or more is distributed (D₈₀) in 30 mesh to 100 mesh ranges.If the macromolecule water uptake tree The particle of fat is excessive, then it is strong to be likely to result in amenities granular sensation, uncomfortable；If fruit granule is too small, amenities produced It will produce more airborne dust in journey.

Preferably, after the imbibition of SAP particles and imbibition before grain size ratio (linear expansion coefficient) can be 20 to 100 (such as It is 20,30,40,50,60,70,80,90 or 100).For example, if the height of liquid-conveying ducts is equivalent to the SAP particles of 5 80 mesh The sum of the diameter of (grain size is about 0.180mm, expansion rate 50), then the height of liquid-conveying ducts is about 0.90mm, imbibition before imbibition Height afterwards is about 45mm, is equivalent to drain effect and improves 50 times.Therefore, liquid-conveying ducts of the invention are imbibition self-expanding Liquid-conveying ducts, between such as water accepting layer and middle layer be arranged liquid-conveying ducts without using absorbing material imbibition expansion Characteristic is being dramatically different the case where expanding liquid-conveying ducts, because the liquid-conveying ducts of latter situation do not have imbibition self expandable Ability, otherwise the then large-sized liquid-conveying ducts of initial designs, thus sacrifice globality, the integral strength of composite absorption core With beauty or be the smaller liquid-conveying ducts of initial setting up, so as to cause drain deficiency with obvious effects.

In some preferred embodiments, the pressurizing absorption amount under the 0.7psi pressure of SAP can be not less than 10g/ G, for example, 10g/g to 26g/g, for example, 10,15,20,25g/g.

In some preferred embodiments, the D of SAP₅₀For 25 mesh to 50 mesh, (grain size of i.e. 50% particle is in 25 mesh To the range of 50 mesh) or its arbitrary subrange, the mesh of for example, 25,30,35,40,45 or 50.In the preferred embodiment party of other In formula, the D of SAP₈₀For 30 mesh to 100 mesh (grain size of i.e. 80% particle is in 30 mesh to the range of 100 mesh) or its anyon Range, the mesh of for example, 30,35,40,45,50,55,60,65,70,75,80,85,90,95 or 100.It is in the particle size range Interior SAP particles can make composite absorbent core body that can preferably form liquid-conveying ducts after absorbing liquid expansion.

In some preferred embodiments, the swirl method infiltration rate of SAP can be less than 85 seconds, be, for example, less than 85, 60,45,20 seconds.The test method of swirl method infiltration rate is as follows：In the 100mL beakers with rotor, it is packed into 0.9% life 50.0 ± 0.5g of brine is managed, beaker is placed on temperature constant magnetic stirring machine, is stirred with 600 revs/min of speed, is accurately weighed The macromolecule of 2.00g, puts into whirlpool, while starting timing with stopwatch, when whirlpool disappears, and liquid level becomes horizontality, As terminal, its time (second) is recorded.3 sample tests are taken, takes the average value of 3 samples as measurement result, is accurate to one small Number.Wherein, the temperature of physiological saline is 25 ± 2 DEG C；Beaker is flat bottom beaker；The a diameter of 8mm of magnetic stirring bar, length are 30mm。

In some preferred embodiments, 16 hours leachable contents of SAP are less than 15%, be, for example, less than 14%, 13%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2% or 1%.The survey of 16 hours leachable contents Method for testing is as follows：200mL physiological saline is weighed with graduated cylinder, is poured into 250mL beakers or conical flask；About 1g SAP are weighed, are put into In conical flask, record weighs the weight m of SAP_s；The physiological saline for filling SAP is stirred 1 under 250 ± 50 revs/min of rotating speed Hour；It another is filled into 200mL is not added with the physiological saline of SAP and do same stir process, as blank sample；Stop stirring, makes The macromolecule of gel sinks to bottom of a cup (placing 10 minutes) completely, filters about 100mL supernatants；50mL blank samples and sample are measured respectively The filtrate of product, it is 10 to be titrated to pH value with standard NaOH solution, and it is 2.7 to be then titrated to pH value with standard hydrochloric acid solution, record The volume of standard solution used.The amount n of carboxylic acid material_COOHIt calculates：n_COOH=(V_NaOH,s–V_NaOH,b)c_NaOH；V_NaOH,sFor by sample Filtrate is titrated to the volume that pH is 10 standard NaOH solutions needed；V_NaOH,bIt is needed for 10 for blank filtrate is titrated to pH The volume of standard NaOH solution；c_NaOHFor the substance withdrawl syndrome of NaOH standard solution；The amount n of whole carboxylate radical substances_totMeter It calculates：n_tot=(V_HCl,s–V_HCl,b)c_HCl；V_HCl,sFrom pH to be that 10 to be titrated to pH be standard HCl used in 2.7 molten by sample filtrate The volume of liquid；V_HCl,bFor by blank filtrate from pH be 10 volumes for being titrated to that pH is the standard HCl solution used in 2.7；c_HClFor The substance withdrawl syndrome of HCl standard solution；The amount of sodium acrylate substance calculates as follows：n_COONa=n_tot–n_COOH；Acrylic acid and third The quality m of olefin(e) acid sodium_COOHAnd m_COONaIt calculates as follows：m_COOH=n_COOH×M_COOH×Fdl；m_COONa=n_COONa×M_COONa×Fdl； M_COOHFor the molal weight of acrylic acid, it is equal to 72g/mol；M_COONaFor the molal weight of sodium acrylate, it is equal to 94g/mol；Fdl is Index is diluted, 200/50=4 is equal to；Solubles content w is expressed as with mass fraction：W=(m_COOH+m_COONa)/m_s×100；m_s For the quality of testing SA P samples.Two samples of parallel testing are averaged.

In some preferred embodiments, the SAP of the different index of at least 2 classes is used.For example, upper water accepting layer Pressurizing absorption amounts of the SAP under 0.7psi pressure is higher than 10g/g, and the particle size distribution range of 50% or more particle is 25 mesh to 50 Mesh；The swirl method infiltration rate of lower water accepting layer SAP is less than 85 seconds, and the size distribution ranges of 80% particle are 30 mesh to 100 mesh, 16 hours leachable contents of SAP are less than 15%.

In other particularly preferred embodiment, hydroscopic high-molecular resin used in the upper water accepting layer from Heart moisture-holding capacity is higher than the centrifuge retention amount of the lower water accepting layer, and hydroscopic high-molecular resin used in the upper water accepting layer Liquid absorption rate is slower than the liquid absorption rate of the lower water accepting layer.Upper water accepting layer and lower water accepting layer use such SAP groups When conjunction, the liquid after imbibition can be significantly reduced and return milliosmolarity.

In some embodiments, the upper water accepting layer is fixed on the downside on the surface layer by hot melt structure glue-line； And/or the lower water accepting layer is fixed on the upper side of the bottom by hot melt structure glue-line.

About the installation position of the liquid-conveying ducts, in other embodiment, the upper water accepting layer and it is described under Water accepting layer is equipped with liquid-conveying ducts in the approximate mid-section or medium position of whole picture composite absorption core width.Implement in other In mode, the upper water accepting layer is equipped with liquid-conveying ducts at the middle part of whole picture composite absorption core width, and in the lower water accepting layer In be not provided with liquid-conveying ducts.In some preferred embodiments, the lower water accepting layer is in whole picture composite absorption core width Middle part be equipped with liquid-conveying ducts, and be not provided with liquid-conveying ducts in the upper water accepting layer.

The present invention is not particularly limited the quantity of the liquid-conveying ducts, for example, can be 1 to 4, for example, 1,2,3 Or 4.

The present invention is also not particularly limited the shape of the liquid-conveying ducts, if can allow absorption liquid more rapidly It spreads on ground.For example, the shape of the liquid-conveying ducts can be strip, Z-shaped shape, S-shaped shape or groined type.Certainly, these Region can also have other shapes, as long as can allow the liquid to spread rapidly and reduce to return oozes.It is excellent at some In the embodiment of choosing, from the point of view of liquid horizontal proliferation speed, preferably strip or groined type.

The present invention is not particularly limited the shape of the inner cavity of the liquid-conveying ducts, for example, the cross of the liquid-conveying ducts Cross sectional shape is V-shaped, trapezoidal, square, rectangle, semicircle or ellipse.

The present invention does not also limit the width (i.e. the width of clear area) of the liquid-conveying ducts of the composite absorption core especially System.In the case where the composite absorption core is used for paper diaper, the width of liquid-conveying ducts is preferably 0.5cm to 4cm, for example, 0.5,1,2,3 or 4cm.If baffle is too narrow, best liquid infiltration rate can not be obtained；If baffle is too wide, can cause to lead Fluid layer both sides macromolecule is blocked up and the liquid absorption area of water accepting layer becomes smaller.

In some embodiments, before not absorbing liquid, the liquid-conveying ducts of composite absorption core are in a thickness direction Size (i.e. height) is less than 1cm, is for example, less than 0.9,0.8,0.7,0.6,0.5,0.4,0.3,0.2 or 0.1cm, or even Smaller.Therefore, so shallow liquid-conveying ducts be can't see at all from the appearance, or even carefully pressing does not touch even feeling Less than the presence of liquid-conveying ducts.On the contrary, using same amount SAP, if excessive, meeting is arranged in the height of liquid-conveying ducts Cause the thickness of composite absorption core excessive, influences globality, integral strength and the appearance of composite absorption core.

It is understandable to be, although such height of liquid-conveying ducts ensure that the globality of composite absorption core, entirety are strong Degree and appearance, but if liquid-conveying ducts are such height less than 1cm before and after imbibition anterior and posterior height imbibition It is likely to limit the drain ability of liquid-conveying ducts.

However, the water accepting layer (upper water accepting layer and/or lower water accepting layer) of the composite absorption core of the present invention is using with imbibition The SAP particles of high level expansion are formed afterwards, the liquid-conveying ducts of composite absorption core are arranged in water accepting layer, and in water accepting layer The corresponding position of middle arrangement liquid-conveying ducts is not distributed water-absorbent material such as SAP.That is, liquid-conveying ducts are the area without being distributed SAP Domain, for convenience of purpose is described, such region is known as clear area in the present invention.Due to SAP particles after imbibition high level expansion, So that the height (size of composite absorption core in a thickness direction) of liquid-conveying ducts can significantly increase after imbibition, to aobvious Improve the drain effect of liquid-conveying ducts with writing.In other words, after the liquid-conveying ducts of composite absorption core of the invention have imbibition Self expandable characteristic is a kind of self-expanding liquid-conveying ducts.To both ensure that composite absorption core (such as product pin before imbibition Sell the stage) globality, integral strength and appearance, in turn ensure after imbibition have enough imbibition water conservancy diversion effects.

In some embodiments, composite absorption core can be omitted water accepting layer and/or middle layer so that composite absorption Core can be three-decker, i.e., be respectively surface layer, upper water accepting layer (or lower water accepting layer) and bottom from top to bottom, or be four layers Structure, i.e., be respectively (1) surface layer, absorbent central layer, lower water accepting layer and bottom from top to bottom, or (2) surface layer, upper water accepting layer, in Between absorbed layer and bottom.

The present invention provides the composite absorption core described in first aspect present invention in manufacture absorbent article in second aspect In application.In some preferred embodiments, the absorbent article be include that the disposable of the composite absorption core is defended Raw articles for use, in further preferred embodiment, the disposable sanitary articles are sanitary napkin or paper diaper especially baby children Youngster's paper diaper.

By the absorbent article be paper diaper in case of, the paper diaper other than the composite absorption core, The structure of the prior art may be used in other parts.For example, paper diaper may include that the composite absorption core is clipped in it In innermost layer and outermost layer, both ends with Velcro patch elastic waistline, both sides stereoscopic leakproof encirclement and can be with institute It states Velcro and pastes the Attacking Midfielder's veneer being used cooperatively.

In some preferred embodiments, the composite absorption core is used for paper diaper, and liquid-conveying ducts are length Bar shaped, more preferably in the strip perpendicular to the length and/or width for meeting absorptive core sheet material so that SAP absorbs urine It is formed after expansion perpendicular to the length of sheet material and/or the strip liquid-conveying ducts of width, sheet material can be along being formed by drain Channel is front and back and/or bends right and left or folds.It is being bent relative to body bilateral along the liquid-conveying ducts perpendicular to sheet width In the case of, it is possible to reduce because expanding to the extruding or friction on the inside of both legs, to eliminate after composite absorption core absorption urine Or it reduces and meets discomfort caused by absorptive core expands；Along the feelings being bent before and after the liquid-conveying ducts of sheet length Under condition, it is possible to reduce the expansion of composite absorption core causes uncomfortable caused by apparent front and back bulging or unsightly.It is more excellent at some In the embodiment of choosing, the shape of the liquid-conveying ducts is strip, and composite absorption core can control certainly after imbibition It is no more than 60 ° by the angle formed after being bent.

The present invention is further detailed below in reference to attached drawing.

Referring to Fig.1, a kind of composite absorption core with water conservancy diversion effect of the present invention, the composite absorbent core is shown Body is five-layer structure, from top to bottom respectively surface layer 1, upper water accepting layer 2, absorbent central layer 3, lower water accepting layer 4 and bottom 5.It is described Lower water accepting layer 4 is equipped with liquid-conveying ducts 6 at the middle part of whole picture composite absorption core width.

The full width of the composite absorption core is 8-15cm, for example, 8-12cm., the lower water accepting layer 4 is in whole picture The middle part of composite absorption core width is equipped with the liquid-conveying ducts 6 of such as 0.5-4cm wide.The width of liquid-conveying ducts can be as needed Design, can be more relatively small (as shown in Figure 2), can also be somewhat larger (as shown in Figure 3).

Fig. 2 is the sectional view of composite absorption core shown in FIG. 1；Fig. 3 is another of the composite absorption core of the present invention The structural schematic diagram of embodiment, wherein composite absorption core are state before imbibition, but answering in the width of liquid-conveying ducts ratio Fig. 1 The width for closing absorptive core is big；Fig. 4 be Fig. 1 composite absorption core imbibition after hydroscopic high-molecular resin expansion to formed very Apparent liquid-conveying ducts；Fig. 5 is the sectional view of the composite absorption core in Fig. 4.

With reference to Fig. 2, Fig. 2 is the sectional view of composite absorption core shown in FIG. 1.In water swelling it can be seen from Fig. 2 Before, composite absorption core is in the cross-sectional area very little of liquid-conveying ducts 6, and composite absorption core is at the position where liquid-conveying ducts 6 Thickness and adjacent position (referring to Fig. 1 to 3) thickness difference very little, be millimeter rank, be equivalent to several or dozens of macromolecule The sum of diameter before water absorbing resin particle expansion, does not interfere with composite absorption core or includes the absorbent article of composite absorption core Packaging and beauty.When the water accepting layer water swelling being made of macromolecule resin, due to not being distributed at liquid-conveying ducts position Hydroscopic high-molecular resin, and the hydroscopic high-molecular resin imbibition on side expands, therefore form cross-sectional area and significantly increase To play the liquid-conveying ducts of significant water conservancy diversion effect (with reference to Fig. 4 and Fig. 5).

Fig. 6 is the sectional view of another embodiment of the composite absorption core of the present invention, and only there are one by macromolecule water uptake The water accepting layer that resin is formed, and there is no absorbent central layer.Such composite absorption core can equally be formed greatly after imbibition The liquid-conveying ducts (as shown in Figure 7) of cross-sectional area.

The sectional view of another embodiment of the composite absorption core of Fig. 8 present invention, has and is formed by hydroscopic high-molecular resin Upper water accepting layer and lower water accepting layer, but do not have absorbent central layer.Such composite absorption core equally being capable of shape after imbibition At the liquid-conveying ducts (as shown in Figure 9) of big cross-sectional area.

The preparation method of composite absorption core of the present invention can for example include the following steps：

(1) baffle is placed along its length in the upper side bottom layer width centre position of bottom, then use glue sprayer sprayed coating heat Molten structural adhesive layer；

(2) the imbibition dilatancy material for being used to form lower water accepting layer is sprinkled on the bottom upper side of sprayed coating hot melt structure adhensive Material, then lay absorbent central layer on lower water accepting layer top；

(3) imbibition of upper water accepting layer is used to form with glue sprayer sprayed coating hot melt structure glue-line and being sprinkled on the downside of surface layer Intumescent material；

(4) material that step (3) obtains is covered in the material that step (2) obtains by the downward mode in upper water accepting layer side Absorbent central layer on；

(5) it takes out baffle and is compacted, obtain the composite absorption core.

In some other embodiments, the method for preparing the composite absorption core described in first aspect present invention also may be used To include the following steps：

(1) glue sprayer sprayed coating the first hot melt structure glue-line is used on the downside of surface layer；

(2) the width centre position in the absorbent central layer on the upper side of absorbent central layer places first along its length Then baffle is sprinkled with the first imbibition intumescent material for being used to form water accepting layer；

(3) the first hot melt structure glue-line is bonded in the upper side for being sprinkled with the first imbibition intumescent material of absorbent central layer On, it takes out first baffle and is compacted；

(4) glue sprayer sprayed coating the second hot melt structure glue-line is used on bottom upper side；

(5) the width centre position in the absorbent central layer on the downside of absorbent central layer places second along its length Then baffle is sprinkled with the second imbibition intumescent material for being used to form lower water accepting layer；

(6) the second hot melt structure glue-line is bonded in the downside for being sprinkled with the second imbibition intumescent material of absorbent central layer On, it takes out second baffle and is compacted.

The method might not be carried out according to sequence described above.Such as：

Step (1) and step (2) can be carried out at the same time, and can also be carried out or be carried out in reverse order successively；

Step (4) and step (5) can be carried out at the same time, and can also be carried out or be carried out in reverse order successively；

Step (1) and step (4) can be carried out at the same time, and can also be carried out or be carried out in reverse order successively；

Step (2) and step (5) can be carried out or be carried out in reverse order successively；

Step (1) and step (5) can be carried out at the same time, and can also be carried out or be carried out in reverse order successively；

Step (2) and step (4) can be carried out at the same time, and can also be carried out or be carried out in reverse order successively；

On condition that step (3) must carry out after step (1) and step (2), and step (6) must be in step (4) It is carried out with after step (5).

Second imbibition intumescent material of the first imbibition intumescent material of water accepting layer and/or the lower water accepting layer of formation in formation It can be by least one material blanking roller blanking.

Furthermore it is possible in the corresponding area of liquid-conveying ducts predeterminated position before surface layer downside sprayed coating the first hot melt structure glue-line It places third baffle and/or is corresponded in liquid-conveying ducts predeterminated position before the second hot melt structure of sprayed coating glue-line on bottom upper side in domain Region place fourth gear plate to form corresponding non-sprayed coating hot melt structure adhensive region, and will non-sprayed coating hot melt structure adhensive region It is correspondingly aligned and is adhered by with first baffle and/or second baffle.

The shape of baffle should be corresponding with the shape and size of liquid-conveying ducts.For example, the liquid-conveying ducts are 1 to 4cm For the strip liquid-conveying ducts of width, then the baffle should be the strip gear for the liquid-conveying ducts that can form 1 to 4cm Plate.

The present invention will be hereafter further detailed by way of embodiment, but protection scope of the present invention is not It is limited to embodiment.

Embodiment 1

Surface layer uses width for 9cm, grammes per square metre 10g/m²Dust-free paper, upper water accepting layer use grammes per square metre 140g/m², 20 mesh height Molecule water-absorbing resin, absorbent central layer use grammes per square metre 35g/m²Hot wind loft non-woven cloth, lower water accepting layer use grammes per square metre 140g/m²、 The hydroscopic high-molecular resin of 40 mesh, bottom use width for 9cm, grammes per square metre 10g/m²Dust-free paper；Preparation process is：

1) the strip baffle for placing 1cm wide along its length in the middle part of the upper side bottom layer width of bottom, then uses glue sprayer Sprayed coating 0.5g/m²Hot melt structure glue-line；

2) lower water accepting layer is sprinkled on the bottom upper side of sprayed coating hot melt structure glue-line, then in lower water accepting layer top is laid Between absorbed layer；

3) with glue sprayer sprayed coating hot melt structure glue-line and it is sprinkled with upper water accepting layer on the downside of surface layer；

4) the upper water accepting layer side of step 3) is covered in downwards to the absorbent central layer top of step 2), takes out strip baffle It can be obtained the composite absorption core with water conservancy diversion effect after compacting.

Embodiment 2

Surface layer uses width for 10cm, grammes per square metre 30g/m²Dust-free paper, upper water accepting layer use grammes per square metre 140g/m², 25 mesh height Molecule water-absorbing resin, absorbent central layer use grammes per square metre 45g/m²Hot wind loft non-woven cloth, lower water accepting layer use grammes per square metre 140g/m²、 The hydroscopic high-molecular resin of 80 mesh, bottom use width for 10cm, grammes per square metre 30g/m²Dust-free paper；Preparation process is：

1) the strip baffle for placing 2.5cm wide along its length in the middle part of the upper side bottom layer width of bottom, then uses glue spraying Machine sprayed coating 1g/m²Hot melt structure glue-line；

Embodiment 3

Surface layer uses width for 11cm, grammes per square metre 50g/m²Dust-free paper, upper water accepting layer use grammes per square metre 140g/m², 32 mesh height Molecule water-absorbing resin, absorbent central layer use grammes per square metre 50g/m²Hot wind loft non-woven cloth, lower water accepting layer use grammes per square metre 140g/m²、 The hydroscopic high-molecular resin of 120 mesh, bottom use width for 11cm, grammes per square metre 50g/m²Dust-free paper；Preparation process is：

1) the strip baffle for placing 4cm wide along its length in the middle part of the upper side bottom layer width of bottom, then uses glue sprayer Sprayed coating 1.5g/m²Hot melt structure glue-line；

Embodiment 4

Surface layer uses width for 12cm, grammes per square metre 20g/m²Dust-free paper, upper water accepting layer use grammes per square metre 140g/m², 34 mesh height Molecule water-absorbing resin, absorbent central layer use grammes per square metre 38g/m²Hot wind loft non-woven cloth, lower water accepting layer use grammes per square metre 140g/m²、 The hydroscopic high-molecular resin of 120 mesh, bottom use width for 12cm, grammes per square metre 20g/m²Dust-free paper；Preparation process is：

1) along the baffle for placing the Z-shaped shapes of 3cm wide in the middle part of the upper side bottom layer width of bottom, glue sprayer sprayed coating is then used 1.8g/m²Hot melt structure glue-line；

Embodiment 5

Surface layer uses width for 8cm, grammes per square metre 30g/m²Dust-free paper, upper water accepting layer use grammes per square metre 110g/m², 33 mesh height Molecule water-absorbing resin, absorbent central layer use grammes per square metre 38g/m²Hot wind loft non-woven cloth, lower water accepting layer use grammes per square metre 140g/m²、 The hydroscopic high-molecular resin of 108 mesh, bottom use width for 12cm, grammes per square metre 20g/m²Dust-free paper；Preparation process is：

1) along the baffle for placing 2cm wide S-shaped shapes in the middle part of the upper side bottom layer width of bottom, glue sprayer sprayed coating is then used 1.6g/m²Hot melt structure glue-line；

In above-described embodiment, place strip baffle, make bottom upper middle position there are the position in gap do not spill it is lower Water accepting layer.When absorptive core absorbs liquid, the hydroscopic high-molecular resin expansion of the upper absorbed layer and the absorbed layer is constituted, To form liquid-conveying ducts 6 at the position for not spilling lower water accepting layer, it is possible thereby to the fluid seepage time is made to shorten, and compared with The diffusion length of composite absorption core is improved well.

Comparative example 1

Composite absorption core (i.e. normal core) is prepared in the essentially identical method of embodiment 1, is led the difference is that not formed Liquid channel (i.e. groove).

Core made from above-described embodiment 1 and 2 is cut into 38X 10cm specifications, tests the composite absorbent core of the present invention Body, and as a contrast with comparative example 1.

Test method be the present invention composite absorption core among put stainless steel annulus (internal diameter 50mm, outer diameter 60mm, Weight is 320g, cylinder heights 5cm), physiological saline 80ml is added every time, is spaced 10 minutes, total liquid feeding body is three times；30th point Clock test, which is returned, oozes (a diameter of 10cm of compression weight, weight 12kg, filter paper is neutral Medium speed filter paper).As a result referring to the following table 1.

Table 1

By data above as can be seen that the composite absorption core of the present invention with liquid-conveying ducts is oozed in infiltration rate and returning Aspect has a clear superiority.

Embodiment 6

Composite absorption core is prepared in a manner of substantially the same manner as Example 1, unlike：Formation width is 3.5cm's Liquid-conveying ducts；Surface layer uses grammes per square metre for 40g/m²Dust-free paper, upper water accepting layer use grammes per square metre 140g/m², grain size be 20 mesh to 50 mesh Water-absorbing resin；Lower water accepting layer uses grammes per square metre for 140g/m², grain size be 20 mesh to 50 mesh hydroscopic high-molecular resin；Bottom is adopted It is 40g/m with grammes per square metre²Dust-free paper；Glue sprayer sprayed coating 1.5g/m in step 1)²Hot melt structure glue-line.Comparative example 2

Composite absorption core (i.e. normal core) is prepared in the essentially identical method of embodiment 6, is led the difference is that not formed Liquid channel (i.e. groove).

Measure the composite absorption core obtained by embodiment 6 and comparative example 2 to the absorption of liquid, spread and return and ooze performance. It measures and uses 4 liquid feeding methods.Concrete operations are as follows.

1st liquid feeding starts timing, and the time is denoted as 0, and liquid volume added is each 60mL physiological saline, 23 DEG C ± 2 DEG C of temperature, the It measures liquid diffusion length within 4 minutes, is measured with graduated scale.The 2nd liquid feeding is carried out within 5th minute, is carried out the 2nd time within the 9th minute Diffusion length measures, and carries out within the 10th minute returning for the first time oozing measurement.The 3rd liquid feeding is carried out within 12nd minute, carries out the 3rd within the 21st minute Secondary diffusion length measures, and carries out within the 22nd minute the 2nd time and return to ooze measurement.The 4th liquid feeding is carried out within 24th minute, carries out the 4th within 33 minutes Secondary diffusion length measures, and carries out within the 34th minute the 3rd time and return to ooze measurement.Liquid feeding method is that there are one 2.4 centimetres of internal diameter is perpendicular with installation Straight liquid-feeding tube, lower part are that tablet, tablet both sides are respectively pressed with the liquid-adding device of counterweight and carry out liquid feeding, each counterweight weight 0.6kg, liquid feeding Device adds counterweight gross weight 2kg, infiltration rate to ooze the time that time i.e. liquid oozes down completely after liquid feeding down, return the test oozed Method is that filter paper is pressed in the paper diaper surface after imbibition with 1.25kg counterweights, is pressed 1 minute, and the matter of filter paper before and after pressure counterweight is weighed Amount difference is to return milliosmolarity.As a result referring to the following table 2.

Table 2

Note：Each time point is to start test as timing in 0min minutes；Soak time is to fully absorb the required time (s)；Diffusion length is the distance (cm) spread in testing time point liquid；It is that testing time point returns the amount (g) oozed to return milliosmolarity.

Embodiment 7 and 8

Embodiment 7 and 8 forms upper water accepting layer under in addition to the SAP particles that pressurizing absorption amount is respectively 10 and 20 are respectively adopted Except water accepting layer, other are carried out in the same manner as in example 6.

Embodiment 9 and 10

Embodiment 9 and 10 forms upper water suction in addition to the SAP particles that swirl method infiltration rate is respectively 85 and 60 are respectively adopted Except layer and lower water accepting layer, other are carried out in the same manner as in example 6.

Embodiment 11 and 12

Embodiment 11 and 12 forms upper water suction in addition to the SAP particles that leachable content is respectively 15% and 10% are respectively adopted Except layer and lower water accepting layer, other are carried out in the same manner as in example 6.

Embodiment 13 to 16

Embodiment 15 to 16 is in addition to being respectively adopted particle mesh number (D₅₀) it is respectively that 20 and 120 SAP particles form water suction Except layer and lower water accepting layer, other are carried out in the same manner as in example 6.

Embodiment 17 to 20

Embodiment 17 to 20 forms upper water suction in addition to the SAP particles that expansion rate is respectively 10,20,100 and 150 are respectively adopted Except layer and lower water accepting layer, other are carried out in the same manner as in example 6.

The composite absorbent core obtained by embodiment 17 to 20 and comparative example 1 is measured in the identical method with described in embodiment 6 Diffusion length (cm) that infiltration rate that body is measured in 24min (the time required to oozing down completely (s)), 33min are measured and Milliosmolarity (g) that 34min was measured return, and calculate needed for the oozing down completely of core of each embodiment of core relative to comparative example 1 Time, which reduces percentage (%), diffusion length increases percentage (%) and returns milliosmolarity reduces percentage (%).Pressurizing absorption amount is Pressurizing absorption amount under 0.7psi pressure.As a result referring to the following table 3.

Table 3

It is surveyed in 24min with measuring the core obtained by each embodiment and comparative example 2 with identical method described in embodiment 6 Returning of measuring of infiltration rate (ooze down completely the time required to (s)), the diffusion lengths (cm) that measure of 33min and 34min Milliosmolarity (g), and calculating reduces percentage relative to the required time of oozing down completely of the core of each embodiment of core of comparative example 2 (%), diffusion length, which increase percentage (%) and return milliosmolarity, reduces percentage (%).In addition, pressurizing absorption amount generation shown in table Pressurizing absorption amount under table 0.7psi pressure；Expansion rate is particle diameter and suction of the SAP particles after saturated absorption physiological saline The ratio of particle diameter before receipts.Leachable content indicates 16 hours leachable contents.Detection method is as mentioned before.

As can be seen from the above table, the composite absorption core obtained by preferred embodiment using the present invention is obviously improved Liquid infiltration rate, infiltration rate can promote 50% to 90%；Meanwhile 10% to 30% left side can be improved in the diffusion length of liquid It is right；In addition, 10% to 80% or so can be reduced by returning milliosmolarity.

Embodiment 21 to 23

Other than content shown in the following table 4 and table 5, composite absorption core is prepared in a manner of substantially the same manner as Example 6, Then paper diaper are fabricated to, which includes that the composite absorption core is clipped in innermost layer and outermost layer therein, both ends The stereoscopic leakproof encirclement of elastic waistline, both sides with Velcro patch and the Attacking Midfielder that can be used cooperatively with Velcro patch Veneer.Wherein, the SAP of used three types is purchased from Shandong Nuoer Biological Technology Co., Ltd., their related performance Referring to the following table 5.The infiltration rate of SAP can indicate that the time is shorter with liquid surface static or stationary rotor time, and infiltration rate is got over Soon.As shown in table 5, the infiltration rate of 511 type SAP is most slow, and the infiltration rate of 610S types SAP is most fast, the absorption speed of 610 type SAP Degree is placed in the middle.In addition, the centrifuge retention amount of 511 type SAP is relatively high, it is higher than 610S types and 610 type SAP, both rear centrifugation is protected Water is identical.These paper diaper are tested to absorbent properties, diffusion according to the method described in embodiment 6 and returns and oozes performance, are tied Fruit see the table below 6.

Table 4

Table 5

SAP models	Infiltration rate-liquid surface static (s)	Infiltration rate-stationary rotor (s)	Centrifuge retention amount
				NR511	32	62	34
NR610	24	46	30
				NR610S	20	34	30

Table 6

Comparing embodiment 21 and 22 is as can be seen that be equally that upper water accepting layer uses 511 type SAP, lower water accepting layer to use 610S The embodiment 21 and 22 of this combination of type SAP, has the liquid of the composite absorption core obtained by the embodiment 22 of liquid-conveying ducts Infiltration rate faster (soak time (second (s)) refers to oozing the time under liquid, and the time is shorter, and infiltration rate is faster), grow by diffusion Spend longer, while it is lower to return milliosmolarity.

Comparing embodiment 22 and 23 can be seen that in the case of being provided with liquid-conveying ducts, when the suction of the SAP of upper water accepting layer The SAP that speed is slower than lower water accepting layer is received, and the centrifuge retention amount of the SAP of upper water accepting layer is higher than the centrifugation of the SAP of lower water accepting layer It is low using paper diaper finished product reverse osmosis amount made of such composite absorbent core body when moisture-holding capacity, it is dry-ness good (such as embodiment 22 Data are shown)；If upper water accepting layer and lower water accepting layer all use fast and centrifuge retention amount as infiltration rate as many 610 When type SAP, although the infiltration rate of the SAP of upper water accepting layer is faster than SAP used in embodiment 22, returning milliosmolarity instead can be relatively It is high.

The composite absorption core prepared using the method for the present invention is had the following advantages that：It is dry-ness good, it does not rise and sticks together, not discontinue, Because having guide functions, liquid infiltration rate is fast, and diffusion is also superior to general composite absorption core.It can be applied to Various absorbent articles, such as amenities such as sanitary napkin idol paper diaper, especially ultra-thin baby paper diaper, baby diaper Deng.

Claims

1. a kind of composite absorption core, the composite absorption core includes surface layer, middle layer and bottom, spy successively from top to bottom Sign is that the middle layer includes the water accepting layer made of the imbibition intumescent material expanded after absorption liquid, and is being absorbed water It is provided with imbibition self-expanding liquid-conveying ducts in layer；The imbibition self-expanding liquid-conveying ducts utilize the imbibition intumescent material It is expanded after imbibition to realize the self expandable of liquid-conveying ducts；The liquid-conveying ducts are by corresponding to the liquid-conveying ducts in water accepting layer Region be not distributed imbibition intumescent material to be formed, the imbibition intumescent material is hydroscopic high-molecular resin.

2. composite absorption core according to claim 1, it is characterised in that：

The middle layer includes the lower water accepting layer positioned at the upper water accepting layer of the surface layer lower surface and positioned at the bottom upper surface； And/or

The liquid-conveying ducts are arranged in the upper water accepting layer and/or lower water accepting layer in whole picture composite absorption core width Portion position；And/or

The upper water accepting layer is fixed on the downside on the surface layer by hot melt structure glue-line；And/or the lower water accepting layer passes through Hot melt structure glue-line is fixed on the upper side of the bottom.

3. composite absorption core according to claim 2, it is characterised in that：

The middle layer further comprises the absorbent central layer between the upper water accepting layer and the lower water accepting layer.

4. composite absorption core according to claim 2, it is characterised in that：

The medium position positioned at whole picture composite absorption core width is arranged in the lower water accepting layer in the liquid-conveying ducts.

5. composite absorption core according to any one of claim 1 to 4, it is characterised in that：

The composite absorption core full width is 8 to 15cm；And/or

The width of the liquid-conveying ducts is 0.5 to 4cm.

6. composite absorption core according to any one of claim 1 to 4, it is characterised in that：

Spun-bonded non-woven fabrics or dust-free paper that the surface layer and/or bottom are square grammes per square metre 10-90g or by polyethylene fibre, poly- Tacryl, polyvinyl chloride fibre, polyester fiber, natural or one or more of synthetic cotton or cellulose fibre are through overheat Wind, hot rolling, spun lacing, needle thorn, spunbond or air web are molded the non-woven fabrics to be formed or textile cloth；And/or the intermediate absorption Layer is loft non-woven cloth of square grammes per square metre in 15-80g.

7. composite absorption core according to any one of claim 1 to 4, it is characterised in that：

The imbibition intumescent material is hydroscopic high-molecular resin particle.

8. composite absorption core according to claim 2, it is characterised in that：

The upper water accepting layer is the hydroscopic high-molecular resin of 20-120 mesh and/or the high score that the lower water accepting layer is 20-120 mesh Sub- water-absorbing resin.

9. composite absorption core according to claim 7, it is characterised in that：

The D of the hydroscopic high-molecular resin particle of the upper water accepting layer₅₀It is inhaled for the macromolecule of 25-50 mesh and/or the lower water accepting layer The D of water-resin particle₈₀For 30-100 mesh.

10. composite absorption core according to any one of claim 1 to 4, which is characterized in that the liquid-conveying ducts are length Strip, Z-shaped shape, S-shaped shape or groined type structure.

11. composite absorption core according to claim 10, it is characterised in that：

The quantity of the liquid-conveying ducts is 1 to 4.

12. composite absorption core according to any one of claim 1 to 4, it is characterised in that：

The linear expansion coefficient of the imbibition intumescent material is 20 to 100；

Pressurizing absorption amount of the imbibition intumescent material under 0.7psi pressure is not less than 10g/g；

The swirl method infiltration rate of the imbibition intumescent material is less than 85 seconds；And/or

16 hours leachable contents of the imbibition intumescent material are less than 15%.

13. according to application of claim 1 to the 12 any one of them composite absorption core in manufacturing absorbent article.

14. application of the composite absorption core according to claim 13 in manufacturing absorbent article, it is characterised in that：

The absorbent article is disposable sanitary articles.

15. application of the composite absorption core according to claim 14 in manufacturing absorbent article, it is characterised in that：

The absorbent article is sanitary napkin or paper diaper.