CN1179091A - Fluid distribution member for absorbent articles exhibiting high suction and high capacity - Google Patents
Fluid distribution member for absorbent articles exhibiting high suction and high capacity Download PDFInfo
- Publication number
- CN1179091A CN1179091A CN 96192736 CN96192736A CN1179091A CN 1179091 A CN1179091 A CN 1179091A CN 96192736 CN96192736 CN 96192736 CN 96192736 A CN96192736 A CN 96192736A CN 1179091 A CN1179091 A CN 1179091A
- Authority
- CN
- China
- Prior art keywords
- fiber
- fluid
- fibers
- surface area
- fluid distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The fluid distribution members according to the present invention preferably comprise three basic components: chemically stiffened, twisted, and curled bulking fibers, high surface area fibers, and thermoplastic binder fibers. Fluid distribution members according to the present invention use a high surface fiber to provide capillary pressure (or suction) to the fluid distribution member. These high surface area fibers are generally small and highly conformable. They provide the substrate with capillary pressure well in excess of the capillary pressure found in the bulk-providing chemically stiffened, twisted, and curled fibers alone. A presently preferred fiber for this high surface application is the eucalyptus family of wood pulp fibers. Eucalyptus provides the capillary pressure usually associated with cellulose fines, but at a large enough length and denier so as to not fill in the voids provided by the chemically stiffened, twisted, and curled fibers and will not easily pass through a forming screen.
Description
The present invention relates to have the fluid dispensing components of improved fluid partition characteristic and storage characteristics.The invention still further relates to and comprise and thisly can be used for for example absorbent structure of the fluid dispensing components of the various absorbent devices of sanpro, disposable diaper, adult incontinent pads and panties etc.
Comprise the entangled fiber sheet, promptly fibroreticulate moisture absorption net is known in the present technique field.This net both can also can absorb for example fluid of body discharges by the siphon mechanism of the capillary gap absorption between the fiber, distribution, store fluid by the hygroscopic mechanism of fibrous material self absorption fluids.A kind of method of improving the wettability power of this fiber net structure is the superabsorbent material that adds the absorption fluids of a kind of for example polymeric gel material (being also referred to as the superabsorbent polymeric material of formation aquogel type etc.).This superabsorbent material is used to retain for example fluids such as liquid of body discharges.
Though have absorbent article core as described above, also need to provide absorbent article core with improved effective moisture absorption capacity.A kind of method that achieves the above object in theory is the content that increases the polymeric gel material in the absorbent article core.Regrettably, the high-load polymeric gel material in the fleece of absorbent article core particularly above the polymeric gel material of about 15% content, may cause a kind of phenomenon that is called gel " obstruction ".When volume increased when forming hydrogel behind the polymeric gel absorbed fluid in the zone of contacting with fluid at first, gel blockage will take place.When the polymeric gel material concentration was too high, hydrogel can be blocked other zones that other fluids reach the absorbent article core with also untapped moisture absorption capacity.When using absorbent device, the generation of gel blockage can cause fluid leaks.
Found out the polymeric gel material that is difficult for taking place gel blockage., this improved polymeric gel material and other superabsorbent materials are subjected to wherein being distributed with the restriction of performance of the cellulosic fibrous web of gel material particle.Particularly, when beginning is moistening, thereby cellulosic fibrous web becomes bigger density to reduce absorptive capacity, permeability and fluid efficiency of transmission with regard to collapse.
For example the Another reason of many absorbent device generation seepages of menopad, adult-incontinence articles and diaper is, even the body discharges fluid is effectively absorbed for the first time, but can not be absorbed with later body discharges fluid for several times for the second time.Drain for several times the seepage that fluid causes for the second time and later on and often occur in night, after the wearer found, the human body fluid was drained repeatedly usually at that time.Except reason discussed above, it is that absorbent article core can not be transported to other zone from the saturated drainage zone of moisture absorption capacity with the body discharges fluid that many absorbent devices can not fully absorb repeatedly the fluidic Another reason of body discharges.The overall performance of absorbent device has been subjected to transporting fluid into the restriction in the zone farthest of absorbent article core.
A kind of method that adopts for the fluid delivery capability that increases absorbent article core is by common absorbent article core densification is produced less average pore state.Although this method has reduced the meansigma methods of total pore-size, in general Zui Da hole has the maximum rate of collapsing, and determines the less hole of final capillary pressure (vertical siphon height) to have minimum change rate.The minimizing of macropore capacity causes reducing in a large number of moisture absorption capacity, more seriously makes the reduction of fluid permeability.
The another kind of method that adopts for the fluid transmittability that increases absorbent article core of past is to have the fiber fines of some of big surface area and granule and by the stiffening general fibre cellulose fiber of handling of chemistry, non-stiffening cellulosic material, synthetic fibers, chemical addition agent and thermoplastic polymer mixing.Because the surface area of per unit volume has very big influence to the capillary pressure of a specific substrate, so the very big fiber of these surface areas provides higher vertical siphon really.But it is very fine and close that final structure becomes, and the fluid transmittability is reduced, and this transmittability is defined herein as the fluid that can make some moves to a specific height by a kind of given cross-sectional area of material in the specific time flux.The increase of the capillary pressure (highly) that these tiny fibers cause causes being transferred to the more significant minimizing of amount of fluid of an assigned altitute.
Fluid dispensing components according to the present invention preferably includes three elements: chemistry is stiffening, twisting and curling swelling fiber, fiber and thermoplasticity bondable fibers that surface area is big.
Fluid dispensing components of the present invention adopts the big fiber of surface area to provide capillary pressure (or siphon) to fluid dispensing components.The fiber that these surface areas are big generally be tiny with highly fit the capillary pressure that the capillary pressure that this fiber provides to substrate has surpassed is stiffening by chemistry, twisting (twisted) and the swelling fiber that twists provide separately.
At present, this preferred fiber with big surface area purposes is the wood pulp cellulose of eucalyptus.Eucalyptus provides generally and considers relevant capillary pressure to be worth doing with cellulose fibre, but this Soft flocks have enough big length and denier, so that can not be filled in the hole that, twisting stiffening by chemistry, crimped fibre provides, and, will be not easy to pass the mesh of formation.Particularly suitable eucalyptus fibers comprises the fiber of a variety of eucalyptus.
Fluid dispensing components of the present invention can be used as the parts of absorbent article core of polytype absorbent device of for example disposable menopad, diaper and Briefs for incontinence patients and is advantageously used, these absorbent devices all comprise one can a saturating fluidic top flat and a fluid-tight egative film that is connected with top flat, wherein absorbent article core is between top flat and egative film.
Although particularly point out and define protection scope of the present invention in claims of the present invention, can more be expressly understood the present invention by description, the wherein identical identical parts of label representative below in conjunction with accompanying drawing.
Fig. 1 is to comprise the perspective view according to the partly cut-away of the preferred embodiment of the absorbent device of the sanpro form of fluid dispensing components of the present invention;
Fig. 2 is to comprise the perspective view according to the partly cut-away of the preferred embodiment of the absorbent device of the diaper form of fluid dispensing components of the present invention.
Fluid dispensing components of the present invention can be used for absorbing a large amount of body fluid for example urine, sweat, menstruation Disposable absorbent article with moisture content in the body discharges thing. This kind moisture absorption articles for use can be processed into disposable Diaper, menstruation pad, adult-incontinence underpants, tampon and Disposable tower and rag etc.
The moisture absorption articles for use here generally comprise three basic structure parts. Parts be one substantially not saturating The egative film of fluid. This above egative film one of placement self can comprise one layer or different which floor, and The absorbent article core that in one or more layers, can comprise a superabsorbent material. One thoroughly the top layer of fluid put At this above absorbent article core, and be connected with egative film. This top flat is the moisture absorption usefulness that approaches with wearers skin The parts of product. Noun used herein " connection " comprises by top flat is directly engaged along the absorbent article core periphery On the egative film and top flat directly is connected structure on the egative film, and by top flat being joined to section of intermediary On the part, again this intermediary's components bonding on the egative film and make top flat indirectly be connected to structure on the egative film. Top flat is connected with egative film and directly is bonded on suction with bonding dose or other connection methods well-known in the art On the wet articles for use periphery, top flat also can be fixed on the absorbent article core.
Preferred disposable diaper or a menstruation pad that is used for the object of the invention comprises an absorbent article core; One Be placed on and inhale on the individual surface that is placed on absorbent article core or with the common top flat that extends of this face and one On the relative face of the face that is covered by top flat of wet core or with the common fluid-tight egative film that extends of this face. The end Sheet and top flat preferably have width and the length bigger than absorbent article core, can provide thus to extend to outside the absorbent article core The narrow marginal portion of the egative film of face and top flat. Egative film and top flat fuse one in these marginal portions usually Rise. Above-mentioned moisture absorption articles for use are for example preferably made the shaping configuration of (but being not limited to) hourglass shape.
Comprise a fluid dispensing components that the following describes according to absorbent article core of the present invention or absorbent structure. Should This points out that for the purposes of the present invention, word " layer " refers to the parts that absorbent structure can be identified, and is any The structure that is called " layer " is actual can to comprise several synusia or the net of the material an of lamination or following necessity In conjunction with body. Word used herein " layer " comprises word " multilayer " or " the one-tenth stratiform ". For the present invention Purpose, should be noted that word " top " refers to the most close and towards the moisture absorption of the top flat of moisture absorption articles for use The layer of core. On the contrary, word " bottom " refers to the most close and towards the absorbent article core of moisture absorption articles for use egative film Layer.
In fact various parts, layer and the structure that should be noted that moisture absorption articles for use of the present invention can be or can Not being the general plane shape, and can make or be configured as desirable any profile.
Absorbent structure of the present invention can comprise having the character that this paper is called fluid dispensing components and multilamellar or a plurality of structure of characteristic.These structures also can comprise having different the composition and for example collecting layer of difference in functionality characteristic and store one or more layers of layer, so that the overall performance of functional characteristic and enhancing absorbent structure is provided for fluid dispensing components of the present invention.
One preferably fluidic (for example silk paper sheet) or other rare gauzes (scrim) can be between fluid dispensing components and miscellaneous parts, so that increase the globality of fluid dispensing components in processing and/or use thoroughly.This sheet or rare gauze may encapsulate all or packed part fluid dispensing components only, or just resemble and place and unnecessary encapsulation fluid dispensing components above-described.Any layer that comprises the superabsorbent material or structure also randomly by one for example the fluid sheet thoroughly of the chiffon scraps of paper encapsulate so that the eliminating user is to the worry of loose superabsorbent material.
The collecting layer
To in the upper flow collecting layer that comprises a kind of hydrophilic fibrous material of following detailed description parts of the parts of absorbent structure.The body fluid of body discharges can be collected and temporarily retain to this fluid collection layer fast.The fluidic part of body discharges is along with the difference of wearer's position, this collecting layer of possible infiltrate and being absorbed by fluid dispensing components near excretory zone., because fluid often vomits, the fluid dispensing components of above-mentioned zone may not resemble human body and discharge fluid absorption fluids so fast.Therefore, the collecting layer, top of this paper also helps fluid is sent to from the zone of initial contacting with fluid other zones of collecting layer.In situation of the present invention, should be noted that noun " fluid " includes, but is not limited to liquid, urine, menstruation, the aqueous body fluid of perspiration.
The fluid function of collecting layer is a particular importance.This fluid collection layer must have competent capillary siphonage, too much fluid do not occur so that discharge the fluid of top flat more fully and retains, so that make following layer (fluid distribution layer) be difficult to the fluid of desorbing collecting layer.
The collecting layer can be by comprising for example polyester, polyethylene or polyacrylic synthetic fibers, comprise the non-woven web of mixture of cotton or cellulosic natural fiber or these fibers or several different materials of textile web, or the material of any equivalence or these mixtures of material are made.
The fluid distribution member
A. the composition of fluid distribution member
Fluid distribution member of the present invention preferably includes three bases: the swelling fiber that chemistry is endured with all one's will, twisted and curl, fiber that surface area is big and adhesive fiber.The fluid distribution member preferably includes that from about 20% to about 80% chemistry is stiffening, twisting and the fiber that curls, the thermoplastic adhesive material of the fiber that about surface area of 10% to 80% is big and this net physical integrity of increase of from 0% to about 50%.The gross weight that above-mentioned all percentage ratio refers to do net is the percentage by weight of benchmark.The fluid distribution member preferably includes the fiber that about chemistry of 45% to 60% is stiffening, twist and curl, about 5% to about 15% meldable fibre adhesives and about 30% to about 45% the very big cellulose jointing material (will be described below) of surface area.This fluid distribution member more preferably comprises about 10% thermoplastic bonding material, fiber that about 45% chemistry is endured with all one's will, twists, curled and about 45% the very big fiber of surface area.Chemical addition agent also can be used as adhesives, and generally with about 0.2% to about 2.0% the concentration adding collecting layer/Distribution Layer heavy with doing net.Three kinds of basic pars fibrosas will be in following detailed description.
The swelling fiber that chemistry is endured with all one's will/twisted
Fluid distribution member of the present invention comprises the fiber that chemical action is stiffening, twist and curl that passes through as major part.Noun used herein " fiber that chemistry is endured with all one's will, twisted and curl " refers to by chemical method and is processed into stiffness so that increase any fiber of the stiffness of fiber under dry and aqueous conditions.This method comprises and for example is used for for example applying or the chemical stiffening agent of impregnation of fibers.These methods comprise that also the chemical constitution by the fiber itself of Change Example such as cross linked polymer chain makes fiber stiffening.
By with the fiber of stiffening independentization (the promptly discongesting) form of cross-bond nineteen sixty-five for example December licensed to the United States Patent (USP) 3,224,926 of Bernardin on the 21st; Licensed to the United States Patent (USP) 3,440,135 of Chung on April 22nd, 1969; The United States Patent (USP) that licensed to Chatterjee on January 13rd, 1976 on January 12nd, 3,932,209 and 1977 licensed in the United States Patent (USP) 4,035,147 of Sangenis etc. open.4,822,453,1989 years Decembers of United States Patent (USP) that preferred fiber licenses to Dean etc. on April 18th, 1989 licensed to the United States Patent (USP) 4,888,093 of Dean etc. on the 19th and license to February 6 nineteen ninety in the United States Patent (USP) 4,898,642 of Moore etc. open.All these patents at this as reference.
Not being bound by theory down, except possess hydrophilic property, these stiffening fibers are " keratinization " preferably roughly.Like this, hole wall can not expand significantly, and keeps the voidage in the network.The cellulose fibre that chemistry is endured with all one's will, twisted and curls has fluidity, flexibility and high hydrophilic thoroughly.Because tiny fiber discussed here is little and highly conformable so, so chemistry is stiffening, twisting and the cellulose fibre that curls become with its stiffening twist/curl and stop that fiber fines is filled into a kind of in a few materials in the interfibrous space.The ability of an open capillary structure of this maintenance also provides the voidage performance except that fiber opening (loft) and infiltration are provided.
Be used for that above-mentioned purpose can apply or other polymerization stiffening agents of impregnation of fibers cellulose fiber comprise that for example those can be from National Starch and Chemical Corp., Bridgewater NJ, USA buy has the cation-modified starch that contains nitrilo (for example amino); Polyamide epichlorohydrin resin (Kymene for example for example
TM557H, Hercules Inc., Wilmington, Delaware, USA), polyacrylamide resin (is for example described in licensing to the United States Patent (USP) 3,556,932 of Coscia etc. on January 19th, 1971, also for example by American Cyanamid Co, Stanford, CT, USA is registered as Parez
TMThe polyacrylamide that can buy of 631 NC trade marks); Urea-formaldehyde and melamino-formaldehyde resin and polyaziridine resin, the relevant general argumentation that is used for the wet-strength resins of paper technical field can be referring to " Wet Strength in Paper and Paperboard " (" wet strength of paper and cardboard ") among Technical Association ofthe Pulp and Paper Industry (pulp and paper technology association) (New York, 1965) the TAPPI monograph serial number No.29.
The fiber that is used in the fluid distribution member of the present invention preferably is processed into stiffening by chemical reaction.For example can be coated onto cross-linking agent on the fiber, after coating, make the then intrastitial cross-bond of chemistry formation of these fibers.These cross-bonds can increase the stiffness of fiber.Although it is preferred making above-mentioned fiber become the stiffening method of chemistry with intrafiber crosslink connection key,, this does not get rid of the reaction of the stiffening fiber of chemistry that adopts other types.
In preferred stiffening fiber, chemical treatment comprise these fibers be in suitable dehydration, isolating fiber (i.e. independentization), twisting, under the rolled state, make the intrafiber crosslink connection with cross-linking agent.Suitable chemical stiffening agent comprises monomeric cross-linking agent, includes, but is not limited to C
2-C
8Dialdehyde and have an acid functionality's C
2-C
8Single aldehyde can be used for forming crosslinker solution.These chemical compounds can be intrachain with single fiber or the cellulose chain of a single intrastitial vicinity at least two hydroxyl reactions.Be used to make the cross-linking agent of enduring with all one's will cellulose fibre and include but not limited to glutaraldehyde, Biformyl, formaldehyde and Acetic acid,oxo-,monohydrate.Other suitable stiffening agents are polycarboxylates of citric acid for example, this polycarboxylate stiffening agent and in the U.S. Patent number 5,190,563 of authorizing on March 2nd, 1993, description is arranged by the technology that they make stiffening fiber, and this patent is at this as a reference.Crosslinked effect under these conditions is to form stiffening fiber, and this fiber can keep the fiber of its twisting, curly form in the use of absorbent device of the present invention.These fibers and manufacturing process thereof have description in above-mentioned relevant patent.
Stiffening cellulose fibre with foregoing preferred physical characteristic and functional characteristic, can resemble U.S. Patent application serial number 304, as described in 925, when these fibers or drying and isolating fiber (promptly " discongesting ") by preparing with corresponding these fibers of dewatering type internal crosslinking., this is not meaning and need get rid of the fiber that other are hydrophilic, chemistry is stiffening, twist and curl, the United States Patent (USP) 3,224,926 that these other fibers are introduced in front from the present invention, 3,440,135,4, in 035,147 and 3,932,209 (but being not limited to these patents) description is arranged.
The fiber that surface area is big
Fluid dispensing components according to the present invention provides capillary pressure (being siphon) with the big fiber of a kind of surface area to fluid dispensing components.The fiber that these surface areas are big generally is very little and highly conformable.The capillary pressure that these fibers provide to substrate surpasses the capillary pressure by chemistry is endured with all one's will, twisted and curling swelling fiber provides separately.
At present, a kind of fiber that preferably has big surface area is the eucalyptus wood pulp cellulose.As many a large amount of cellulose fibres bits as described below, Eucalyptus provides usually and considers relevant capillary pressure to be worth doing with cellulose fibre, but these Soft flocks have enough length and danier, thereby can not be filled into that chemistry is stiffening, in the space of twisting and the fiber that curls and be not easy to pass forming net.Specially suitable eucalyptus fibers comprises the fiber of yate (eucalyptus grandis).
Form wet net by a kind of slurry material before, be used for being added to other fibers that are fit to the big surface area of generation of enduring with all one's will cellulose and comprise (but being not limited to) various celluloses and composite fibre materials, as licensing to the U.S. Patent number 5 of (as a reference) such as Young on June 8th, 1993 at this, disclosed in 217,445.This material comprises that non-stiffening cellulose fibre (be general fibre plain pulp fiber), this paper are called highly refined, the non-stiffening cellulose fibre (preferably have less than 200 Canadian Standard Freenesses (CSF), more preferably have from about 40-100CSF) of " Crill ", the very big cellulosic material of surface area of expansible cellulose fibre (described below) for example.Stiffening fiber mixing in cellulose that surface area is very big and the slurry, and with this slurry by the such wet-laying of top description.Can use agitator, scraping machine, Valley agitator, refiner (as refiner single taper or double plate), or other equipment well-known in the art mix, pulverize stiffening fiber and the big cellulose of surface area.
The cellulose that surface area is big can be by being made by the hole of a minor diameter a kind of liquid suspension of cellulose fibre by this cellulose fibre, wherein suspension is subjected to 3000psi (pound/inch at least
2) pressure fall and a high speed shear effect, then be subjected to high deceleration collision.Repeat to allow suspension by above-mentioned aperture up to obtaining a roughly steady suspension, referring to the United States Patent (USP) 4,483,743 that licenses to Turbak etc. in this 20 days November in 1984 as a reference.
Be used for enhanced hot-melt adhesive fiber
Compare with the non-stiffening cellulose fibre of routine, the fiber that crosslinked, twisting, stiffening fiber and surface area described above is big mixes mutually to form and has the sheet that hangs down hot strength, particularly under wetted situation.Therefore, in order to be easy to process and provide the specific engineering properties of product under moisture state and drying regime, it is interior or online preferably a kind of adhesives integrally to be mixed net.This can be by adding adhesives in the slurry before net is shaped, be deposited on one be shaped thread on after, before its drying, after the drying, adhesives is administered to finishing of this wet-laying on the net, or the combination of said method.
Fluid distribution member of the present invention then is that the integration by a miniature net of heat bonding polymer in the material addresses these problems.This piconet forms (for example Hoechest-Celanese Copolyolefin Bicomponent fiber etc.) by the polymer bonding fiber that brute force is bonded in fiber cross section.The miniature knot of this polymer makes this net can stand the strict softness course of processing.Therefore, control quantity (annular roller) (promptly by ripply roller) that this net extends, wrinkling, S type winding etc. by strictness outside the plane), wet/dried draftability, flexibility and elasticity that the characteristic of heat curing copolymer piconet is obviously controlled and kept, and keeping acceptable wet to dry tensile strength and the elastic wide range of mechanical softness that allows simultaneously.
In a preferred embodiment, the fluid distribution member comprises the net that the wet method of a stiffening cellulose fibre becomes, wherein this net is with about 0% to about 50%, preferably about 5% to about 25%, most preferably reinforce a kind of thermoplastic bonding material of about 7% to about 15%, wherein this thermoplastic bonding material is in bondable fibers and other bondable fibers, and the intersection of the fiber that chemistry is stiffening, twisting and crimped fibre cellulose fiber or surface area are big provides adhesive spots.In general, this heat bonding net can be preferably in whole online equally distributed stiffening cellulose fiber peacekeeping thermoplastic fibre and forms a net and make by containing.Before this net formed, this thermoplastic fiber materials can mix with the fiber fines in the cellulose fiber peacekeeping aqueous slurry of enduring with all one's will.In case should form by net, with regard to by this net of heating up to the thermoplasticity partial melting of fiber and heat bonding together.The concrete unrestricted example of suitable fibrous material comprises: meldable fibre (KODEL 410), bicomponent fibre, tricomponent fibre and their mixture etc.
In addition, a kind of cockle class provides extra bulk for this net based on the adhesive material of polymer.At present the cockle class is the CELBOND that can buy from Hoechst-CelaneseCorporation based on the bonding agent fiber of polymer preferably
Trade mark, model 255, the Hoechst-Celanese Copolyolefin bicomponent fibre of crowd (lot) 33865A has about 3.3 dtexs (detex), about 3.0 deniers and about 6.4mm fibre length.
The thermoplastic bonding material who is used for the fluid distribution member of this paper comprises any hot-melt adhesive that can melt under the temperature of a large amount of damaged fiber cellulose fibers not.Thermoplastic bonding material's fusing point is preferably less than about (175 ℃), most preferably between about 75 ℃ to about 175 ℃.Under any circumstance, this fusing point should be not less than the humidity that absorbent device of the present invention may store, and therefore, melting point generally is not less than about 50 ℃.
The thermoplastic bonding material may be for example polyethylene, polypropylene, polyester, polrvinyl chloride, Vingon.
Thermoplastic fibre preferably sucks or the absorption aqueous fluid indistinctively.The surface of thermoplastic can be hydrophilic or not hydrophilic.(noun used herein " hydrophilic " and " not hydrophilic " refer to the degree that this material surface is soaked in water).Water wetted material is more desirable on than higher thermoplastic grade, particularly on about grade more than 40%.
The length of thermoplastic fibre used herein can preferably arrive between about 3.0cm at about 0.3cm at about 0.1cm between about 6cm.
Thermoplastic fibre is preferably by ventilation bonding (through-air bonding) fusing, but this is not meaning and does not use for example infrared ray, steam drum dried, Yankee dryer additive methods such as (Yankee).In another kind changes, on a surface of this net or two surfaces, carry out the hot pressing stricture of vagina.This technology is at United States Patent (USP) 4,590, has a detailed description in 114, and this patent is introduced in this explanation as a reference in front.
As discussed earlier, for example the gauze of the non-woven sheets of silk paper sheet and other porous can be used as the additional external support except that above-mentioned bonding agent or replaces above-mentioned adhesives as external support.
The net that is used to increase the physical integrity of Distribution Layer and/or conveniently is used as Distribution Layer, particularly other bonding agents of the processing of wet lapping comprise chemical addition agent, increase fleece globality resin adhesive, latex and starch for example well known in the art.The appropriate resin bonding agent comprises known those binding agents that the wet strength of paper structure can be provided, those bonding agents in " the moistening intensity of paper and cardboard " [slurrying and paper industry technological associations (New York, 1965)] for example at this TAPPI monograph serial number 29 as a reference.Appropriate resin comprises polyamide-chloropropylene oxide and polyacrylamide resin.Other resins of Shi Yonging are urea-formaldehyde and melamino-formaldehyde resin in the present invention.The more common functional group of these multifunctional resins is amino group or the methylols that for example are connected on the nitrogen.The polyethylene imine resinoid also can use in the present invention.
Starch, particularly cationic modified starch also can be used as chemical addition agent and uses in the present invention.This cationic starch material is general to carry out modification with being connected the amino on the nitrogen or the nitrogen-containing group of methylol groups, this starch can be from being positioned at Bridgwater, and the Natural Starch andChemical Corporation (national starch chemical company) of New Jersey buys.Other suitable bonding agents include, but is not limited to polyacrylic acid, polyvinyl alcohol, the polyethylene acetate.
The concentration that the chemistry that adds adds bonding agent generally account for this net heavy about 0.25% to about 2%.Hydrophilic chemistry adds the consumption use that bonding agent can be bigger.If the chemical adhesive additive is added in the stiffening fiber of aqueous slurry, so the fiber that Chang Gui non-stiffening cellulose fibre or surface area are big preferably also exists, to strengthen the reservation that chemistry adds bonding agent.Chemistry adds bonding agent and can be applied in dry or moist online by printing, spraying or the additive method of knowing in the art.
Material forming technology
The constituent of fluid distribution member of the present invention may be mixed together and by comprising that wet-laying method, air lay method, carded reason become net with the whole bag of tricks of additive method, wherein the wet-laying method is preferred at present.
With the cellulosic fibre material wet-laying, be known in the art so that form the technology of the sheet material of for example exsiccant lamination and paper.These technology generally are used for the wet-laying of stiffening fiber, so that be formed for the net sheet of the wet-laying of absorbent structure of the present invention.Suitable wet-laying technology comprises and manual becomes net method (handsheeting) and with the wet-laying method that papermaking equipment carries out, and for example licenses in the United States Patent (USP) 3,301,746 of L.H.Sanford etc. disclosed.Because chemistry is endured with all one's will, is twisted and the characteristic, the particularly tendency of its flocculate in aqueous slurry of the fiber of bending, so when with the papermaking equipment wet-laying, preferably carry out some following processing improvement.
Generally speaking, can be deposited on by aqueous slurry on the porous forming net, the wet method de-watering of slurries so that form wet net, will be wet then and nets dry and the formation wet-laid web fiber.The fibre concentration of aqueous slurry that is used for the fiber of wet-laying accounts between the slurry gross weight about 0.02% to about 20%, preferably between about 0.02% to about 0.2%.The slurry deposition is generally finished with for example flow box device well-known in the art.Flow box has the opening that an aqueous slurry with fiber that is called scraping blade is conveyed into porous formed net.This forming net can have structure and the mesh size that is used for exsiccant lamination or other paper technologies.Preferably use about 70 mesh to about 100 (the net yardsticks of Tyler standard).(unless special indicating arranged, and the mesh size that the present invention uses all should be benchmark with Tyler standard network yardstick).Can use the conventional design that is used for the flow box of dry stack and the shaping of tissue paper sheet well-known in the art.The suitable flow box that can buy for example comprises, open, fixed top, the flow box of the net of two nets, inclination and rotary drum forming machine.
In case form wet net, this wet net is dehydrated and dry.Dehydration can be carried out with suction box or other vacuum equipments.Dehydration generally the concentration of fiber can be increased to total wet net weight about 8% to about 23% between, preferably be increased between about 8% to about 23%.If wish concentration to be brought up on 23%, may need wet extruding, and also seldom recommend by dehydration.After the dehydration, this net can (but not must) be sent to this network transmission to the dry fabric of drying device from forming net.
The drying of wet net may use many technology well-known in the art to finish.Particularly importantly should make under the temperature that thermoplastic bonding material and other fibrous materials fuse together thoroughly and drying equably, but this temperature can not be too high, otherwise can cause that the thermoplastic bonding material flows in the space capacity of network structure at one.Dry can and comprise the heating drum exsiccator of Yankee exsiccator by for example blowing hot wind exsiccator, a hot-air impingement drying device.The best bone dry of wet-laid web (generally being dried to fibre concentration reaches between about 95% to about 98%).The flexibility of the net of intensive drying is increased.The appropriate method that increases the flexibility of net comprises the Yankee exsiccator that has doctor with, or utilize one of several mechanical technologies, for example make the wrinkling or micro-creping of this net with doctor or relative roller, S twines, and rolls this net or other technologies well known in the art with ripply roller.The technology that increases the flexibility of this net or flexibility can be used as the part of this net shaping processing technique and finishes, or finishes as an independently postforming operation.
Except above-mentioned preferred wet laying process, need in some cases to form according to fluid distribution member of the present invention by air lay, carded reason or other suitable methods.
Store layer
Absorbent structure of the present invention can randomly comprise the extra play that mainly has the fluid storage characteristic.These store layer and generally have the transmission and the siphonage of qualification, but have very big storage or retain capacity, and rely on the fluid distribution member that the fluid that enters is distributed on bigger area.
The conventional design and the composition that store layer or storage member are selected according to the concrete purposes that stores layer.This storage layer or storage member can be single or multiple lift, structure identical or stratified, profile arranged or homogeneous etc.The suitable material that is used in this storage member can be natural or synthetic, weaving, on-woven, fiber, cellulose or microgranule, and can comprise granule, layer or the zone of moisture absorption polymeric gel material.Storage member may have the size and/or the shape applicable to specific use of any hope, comprises the shape of square, rectangle, avette, oval, oblong etc.This storage member can be 3D shape or general plane shape.
The absorbent device that illustrates
Noun used herein " absorbent device " refers to and absorbs and retain the fluidic device of human body, and more particularly, refers to be placed on the wearer's body or neighbouring so that absorb and retain the device of various slops.Noun used herein " disposable " refer to do not plan to wash or with other method reclaim or reuse do absorbent device absorbent device (be that these absorbent devices plan once using the back being abandoned, and preferably reclaim, as compost or with the method processing that helps environment)." monoblock type " absorbent device refers to the integral body that is combined together to form a coordination by independent parts, so that this absorbent device does not need as the manual parts that separate of lining and pad independently.
A preferred embodiment of monoblock type disposable absorbent article of the present invention is a menopad as shown in Figure 1, sanitary towel 20.This noun that is to use " sanitary towel " refers to by the women and is through perineal position, and general urogenital region is outside and be used for absorbing, retain that menstrual fluid and other wearer's body excrete through liquid and other vagina Excretas (for example blood, menstruation and urine).Part is in wearer's vestibule inside, and part is installed also within the scope of the invention between the lip of vestibule outside.Visible women's external genitalia official that noun used herein " pudendum " refers to.Should be appreciated that the present invention also can be used for other for example the feminien hygiene pad or menopads of short underpants lining, or other absorbent devices of incontinence pad, tampon etc. for example.
Figure l is the plan view that sanitary towel 20 of the present invention is in flat, and the part-structure of this sanitary towel is broken away so that clearly show that the structure of sanitary towel 20.Sanitary towel 20 towards or the contact wearer part towards the observer.As shown in Figure 1, sanitary towel 20 preferably include one can 22, one 23, one absorbent article cores 25 between top flat 22 and egative film 23 of fluid-tight egative film that link together with top flat 22 of saturating fluidic top flat.Sanitary towel 20 shown in Figure 1 is absorbent devices of the simplification of the sanitary towel before an expression is placed on wearer's underwear.Should be appreciated that, the invention is not restricted to the specific type or the configuration of sanitary towel as shown in Figure 1.
Sanitary towel 20 has two surfaces, and a contact human body surface is " body surface " and a medicated clothing surface.Sanitary towel 20 shown in Figure 1 looks from its body surface.When the wearer used sanitary towel 20, this body surface was planned near wearer's body worn, and the underwear surface is placed on close wearer's underwear in dorsal part and plan.Sanitary towel 20 has two centrages, a longitudinal centre line " L " and a cross central line " T ".Noun used herein " vertically " refer to sanitary towel 20 generally with straight line, axle or direction in a wearer's body of standing that will wear this sanitary towel is divided into the plane of vertical plane consistent (for example almost parallel) of left and right sides two halves.Noun used herein " laterally " or " laterally " be can exchange and refer to sanitary towel 20 roughly with vertical vertical plane in line, axle or a direction.Fig. 1 also illustrates sanitary towel 20 and has the periphery of being determined by the outer ledge of sanitary towel 20 30, and wherein the longitudinal edge of sanitary towel 20 (or " lateral edges ") is designated as 31, and end edge (or " end ") is designated as 32.In the embodiment shown in fig. 1, sanitary towel 20 is with respect to longitudinal centre line and cross central line symmetry.
Sanitary towel 20 preferably includes flank or " flap " 34 around the crotch district that is folded in wearer's underwear.This side flap 34 can be used for many purposes, includes, but is not limited to: protection wearer underwear is not made dirty and sanitary towel is fixed on wearer's underwear.
Although top flat, egative film and absorbent article core may be assembled into various known configurations (comprising what is called " tubulose " articles for use or side flap articles for use), preferred sanitary towel configuration has been made describe, in general terms in following patent: the United States Patent (USP) 4 that is entitled as " Thin; Flexible Sanitary Napkin " (" thin and flexible sanitary towel ") that licenses to Osborn August 21 nineteen ninety, 950,264; Licensed to the United States Patent (USP) 4,425,130 that is entitled as " Compound Sanitary Napkin " (" sanitary towel of combination ") of DesMarais on January 10th, 1984; License to the United States Patent (USP) 4,321,924 that is entitled as " Bordered DisposableAbsorbent Article " (" marginate disposable absorbent article ") of Ahr March 30 nineteen eighty-two; Licensed on August 18th, 1987 in the United States Patent (USP) 4,589,876 that is entitled as " Shaped Sanitary Napkin WithFlaps " (" protective wing type sanitary napkin of shaping ") of Van Tilburg and describe.Above-mentioned patent all is to introduce the present invention as reference.Fig. 1 shows top flat 22 and egative film 23 and has a preferred embodiment than the sanitary towel 20 of big length of absorbent article core 25 and width.Top flat 22 and egative film 23 extend beyond the edge of absorbent article core 25, thereby not only form peripheral part but also form side flap.
As shown in Figure 1, egative film 23 and top flat 22 are placed near the underwear of sanitary towel 20 surface and body surface respectively, and egative film and top flat preferably interconnect, so that form peripheral 30.For example, egative film 23 and top flat 22 can have independently lines, the helix of the bond layer of figure or string bonding agent and point is fastened to each other is in the same place by an even successive bond layer, one.The bonding agent that is fit to use is by H.B.Fuller Company of St.Paul., and Minnesota is according to HL-1258 or H-2031 standard manufacture.In addition, top flat 22 and egative film 23 can be bonding by heat bonding, pressure, ultra-sonic welded, dynamic power machine is bonding or any other the is well known in the art method that top flat and egative film are linked together be connected to each other and be in the same place.A kind of particularly suitable method is by a zigzag weld seam (crimp seal) top flat 22 and egative film 23 to be linked together.
Article one, fluid-tight bead arrangements is in the marginal portion along periphery 30.This weld seam is used to prevent that fluid from laterally moving (being siphon) by periphery 31 and 32 from the periphery 30 of sanitary towel 20, prevents too early side direction wearer's the underwear of making dirty whereby.Therefore, top flat 22 and egative film 23 keep not having fluid basically.The best landscape configuration of this weld seam is as far as possible inwardly near periphery 30, so that more most marginal area keeps dry and do not made dirty.This weld seam is preferably in without any intactly surrounding periphery 30 under the slit that causes siphon and escape of liquid.
Above-mentioned weld seam is preferably by generally being called the formation of exerting pressure in heating or when not heating that " crimping " (crimping) operated.In " crimping " technology, enough pressure and randomly the heating can melt top flat 22 and egative film 23 so that form this weld seam.The marginal area in this weld seam outside is with dispersive bonding agent crimping at regular intervals.Reverse or the minus capillary gradient of this dispersive bonding generation is so that the fluid that above-mentioned weld seam is passed in any chance is guided the finer and close material on the zone of seam into; Fluid moves all along weld seam and the direction generation opposite towards the outside, edge any of this seam outside.
The multilamellar of material of the present invention also can have the different compositions or the ratio of one or more constituents.By a structure in the structure that many possible fluid distribution member are described, fluid distribution member 24 can have three layer laminate structures, comprise that by about 45% stiffening, twisting and the fiber that curls the upper and lower sublevel (sub-layers) that about 45% eucalyptus fiber and about 10% bicomponent fibre constitute and one introduce the sublevel of above-mentioned granule sucting wet gel material between two-layer by chemistry.The layer of fluid distribution member of the present invention or sublevel also can have similar or different quantitative and/or density.
In preferred embodiment shown in Figure 1, the absorbent article core 25 of sanitary towel 20 preferably also comprises a secondary top flat or a collecting layer 27 between distribution member 24 and top flat 22.
As required, sanitary towel 20 also can comprise for example additional absorbent structure of storaging piece, and this storaging piece can adopt various sanitary towel and other absorbent devices of being usually used in, and the material of various absorption liquid of wood pulps that for example is commonly referred to as the pulverizing of gas felt is made.The example of other suitable hygroscopic material comprises corrugated cellulose wadding; The meltblown polymer that comprises coform; Chemistry is stiffening, modification or cross-linked cellulosic; The synthetic fibers of texturized polyester for example; Peat moss; The fabric that comprises fabric integument and fabric laminate; Hygroscopic foam material; The moisture absorption sponge; The superabsorbent polymer; Sucting wet gel material; Or the chemical compound of any equivalent material or material, or these mixtures of material.These extra plays can be placed on the top of fluid distribution member 25 or below, and/or between fluid distribution member 25 and other parts such as collecting layer 27.
License to the United States Patent (USP) 4,950,264 that is entitled as " Thin, Flexible Sanitary Napkin " (" thin and flexible sanitary towel ") of Osborn in August 21 nineteen ninety as the exemplary absorbent structure of absorbent article core of the present invention; JIUYUE in 1986 licensed in 9th being entitled as of Weisman etc. ' High-DensityAbsorbent Structure " United States Patent (USP) 4,610,678 of (" high-density absorbent structure "); Licensed to the United States Patent (USP) 4 that is entitled as " High Density Absorbent Members HavingLower Density and Lower Basis Weight Acquisition Zones " (" having high-density absorbent parts ") of Alemany etc. on May 30th, 1989 than low-density and low quantitative collecting region, 834,735; With Procter ﹠amp; Gamble Company described in the nominal disclosed European Patent Application No. 0198683 of Duenk etc. on October 22nd, 1986.Above-mentioned these patents at this as a reference.
In an embodiment of the present invention, collecting layer 27 possible configurations are between top flat 22 and distribution member 25.This collecting layer can be collected fast and temporarily be retained the fluid of body discharges, and is convenient to fluid is transferred to from initial fluid contact point other parts of collecting layer and absorbent article core.It is very important improving excremental transmission, and its reason comprises to be distributed Excreta more equably and can make sanitary towel 20 make quite thinly in whole absorbent article core.The transmission of indication of the present invention can comprise the transmission of fluid on one, two or all directions (that is, in the x-y plane and/or in the z-direction).
The collecting layer may be by comprising for example polyester, polyethylene or polyacrylic synthetic fibers, for example cotton or cellulosic natural fiber, or the non-woven web of the mixture of these fibers or textile web, or the different material of the material of any equivalence or mixtures of material is made.Has the U.S. 4 that the example of the sanitary towel of a collecting layer and a top flat is licensing to Osborn, 950, describe in detail in the U.S. Patent application serial number 07/810,774 that is entitled as " Absorbent Article Having Fused Layers " (" absorbent device ") that 264 and 1991 on Decembers 17, are submitted to the name of Cree etc. with fused layers.Above-mentioned patent at this as reference.In a preferred embodiment, the collecting layer may link together by traditional any method that net is linked together, and most preferably is by the fusion of describing in the Cree application of quoting as proof in the above is bonding collecting layer and top flat to be linked together.
Top flat 23 is liquid-tight (for example menstruation and/or urine), although but also can use the material of the transflective liquid of other flexibilities, preferably make by thin plastic.Noun used herein " flexibility " refers to submissive and is easy to and the general shape of human body and the material that profile phase is fitted.Egative film 23 can prevent to absorb and remain in Excreta in the absorbent article core 25 clothes such as for example short underpants, nightwear and underwear of contact sanitary towel 20 of getting wet.This egative film 23 can comprise weaving or nonwoven material, as the polymer thin film of polyethylene or polypropylene thermoplastic thin film, and the perhaps composite of the nonwoven material that covers of thin film for example.This egative film preferably is to have the polyethylene film of about 0.012mm (0.5 Mill) to about 0.051mm (2.0 mil) thickness.Polyethylene film in the example is by Clopay Corporation of Cincinnati, and Ohio is according to P18-0401 standard and Ethyl Corporation Visqueen Division, of Terre Haute, and Indiana makes according to the XP-39385 standard.This egative film is preferably handled so that a surface that more resembles fabric is provided through embossing and/or delustring.In addition, egative film 23 can allow steam to shed from absorbent article core 24 (being breathable), but should prevent that Excreta from passing egative film 23.
Top flat 22 is submissive, soft feelings and does not stimulate wearer's skin.In addition, top flat 22 is can be fluidic thoroughly, and its allows fluid (for example menstruation and/or urine) at an easy rate by its thickness.Suitable top flat 22 can be made by the very wide material of scope, for example weaving and nonwoven material; For example foraminous shaping thermoplastic film, the polymeric material of the thermoplastic film of foraminous plastic sheeting and hydroforming; Perforated foams; Reticulated foam; Weblike heat plastic films and thermoplasticity gauze (scrims).Suitable weaving and nonwoven material can be by natural fiber (for example wood or cotton fibers), synthetic fibers (for example, the polymer fiber of polyester, polypropylene or polyethylene fibre) or be made up of the mixture of natural fiber and synthetic fibers.
Being used for preferred top flat of the present invention selects from high dry (high loft) on-woven top flat and foraminous formed film top flat.Foraminous formed film is particularly preferred top flat, because this thin film is that body discharges is fluidic thoroughly, but does not absorb this fluid, and the trend that does not allow fluid to bleed back and repeat moistening wearers skin is arranged.Like this, the surface of the formed film of contact human body keeps dry, and has therefore reduced the chance of the human body of making dirty, and has made the wearer feel more comfortable.Suitable formed film licensed to being entitled as of Thompson on the 30th at December in 1975 " Absorptive Structure Having TaperedCapillaries " United States Patent (USP) 3,929,135 of (" having tapered absorbent structure capillaceous "); License to being entitled as of Mullane etc. April 13 nineteen eighty-two " Disposable Absorbent Article HavingA Stain Resistant Topsheet " United States Patent (USP) 4 of (" disposable absorbent article ") with top layer of stain resistance, 324,246; License to the United States Patent (USP) 4,342,314 that is entitled as " Resilient PlasticWeb Exhibiting Fiber-Like Properties " (" elastoplast net ") of Radel etc. August 3 nineteen eighty-two with like fibrous characteristic; Licensed to being entitled as of Ahr etc. on July 31st, 1984 " MacroscopicallyExpanded Three-Dimensional Plastic Web Exhibiting Non-Glossy Visible Surfaceand Cloth-Like Tactile Impression " United States Patent (USP) 4 of (" macroscopical extensile three-dimensional plastic net ") with sense of touch of visually lacklustre surface and textile-like, 463,045; With description in the United States Patent (USP) 5,006,394 that is entitled as " Multilayer Polymeric Film " (" multilayer polymeric thin film ") that licensed to Baird on April 9th, 1991.These patents at this as reference.Preferred top flat of the present invention is the formed film described in front one or more patents and by The Procter ﹠amp; Gamble Companyof Gncinnati, Ohio are registered as " DRI-WEAVE " aspect sanitary towel.
In preferred embodiment of the present invention, the body surface of formed film top flat is hydrophilic, so that making the fluid ratio top flat is not that hydrophilic situation is passed top flat quickly, can reduce like this that menstrual fluid flows out top flat and the probability that do not flow into absorbent article core and absorbed by absorbent article core.In a preferred embodiment, surfactant can be added in the polymeric material of formed film top flat, for example described in the U.S. Patent application serial number of submitting by Aziz etc. in this 19 days November in 1991 as a reference 07/794,745 that is entitled as " Absorbent Article Having A Nonwoven andApertured Film Coversheet " (" having the tectal absorbent device of on-woven hole film ").The body surface of this top flat can be treated to hydrophilicly with surfactant in addition, for example draws United States Patent (USP) 4,950 for reference at this, described in 254.
In use, sanitary towel 20 can fix in position with any known supporting arrangement or fixture (not shown) that is used for this purpose.Sanitary towel preferably is placed in wearer's the underwear or medicated underpants, and is fixed on the underwear with the fixture of for example bonding agent.Bonding agent provides a kind of method that sanitary towel is fixed on interior crotch area.Like this, the part of egative film 23 or all outer surfaces all are coated with bonding agent.Any bonding agent or the glue that are used for this purpose in the art can be done at this used bonding agent, and wherein pressure adhesive is preferred.Suitable bonding agent is by the Century AdhesivesCorporation of Columbus, the Century A-305-IV that Ohio makes; With by NationalStarch and Chemical Company of Bridgewater, NJ, the Instant Lock 34-2823 of manufacturing.Suitable adhesive securement is at United States Patent (USP) 4,917, description also arranged in 697.
Before sanitary towel used, pressure adhesive was generally covered by the release liner that can tear, so that prevent to use the front attachment agent dry or be bonded on certain surface except that the crotch district of underwear.Suitable release liner has description in above United States Patent (USP) 4,917,697 as a reference.Any release liner that can buy as above-mentioned purpose can be used.The infinite example of suitable release liner is by the AkrosilCorporation of Menasha, BL30MG-A Silox E1/0 and BL30MG-ASilox 4P/O that WI makes.When using sanitary towel 20 of the present invention, tear release liner earlier, then sanitary towel is placed on the underwear, so that make bonding agent contact underwear.In use, bonding agent is on the suitable position of short underpants sanitary towel.
Fig. 2 illustrates the preferred embodiment with the disposable absorbent article of diaper 100 forms.Noun used herein " diaper " refers to the covering that generally is through lower trunk by baby and incontinence patient.Should be noted that the present invention also can be applicable to for example other absorbent devices of incontinent brief, incontinence pad, short pants for training, diaper liner, sanitary towel, medicated napkin, towel etc.The diaper of describing among Fig. 2 100 is to represent an absorbent device that is placed on a simplification of the diaper of wearer before on one's body., should be noted that, the invention is not restricted to the special type and the structure of diaper shown in Figure 2.
Fig. 2 is that diaper 100 of the present invention is in the not perspective view of contraction state (that is, removing all flexible contractibilities that cause), the part of this structure is cut open, so that be clearly shown that the structure of diaper 100.Diaper 100 contact wearers' zone is towards the observer.Diaper 100 shown in Figure 2 preferably includes one can saturating fluidic top flat 104; A fluid-tight egative film 102 that links together with top flat 104; And absorbent article core 106 between top flat 104 and egative film 102.For example sanitary towel being fixed on the elastic component of wearer appropriate location on one's body and the additional architectural feature of fixture (for example strap fixture) is also included within the diaper.
Although top flat 104, egative film 102 and absorbent article core 106 can be assembled into various known structures, a preferred diaper structure has description in the United States Patent (USP) that licenses to Buell on January in 1975 14 3,860,003 that is incorporated herein by reference.The interchangeable preferred construction of disposable diaper licenses to the United States Patent (USP) 4,808,178 of Aziz etc. on February 28th, 1989; The United States Patent (USP) that licensed to Lawson on November 22nd, 1987 licensed on March 28th, 4,695,278 and 1989 in the United States Patent (USP) 4,816,025 of Foreman description, these patents at this as reference.
Fig. 2 shows the preferred embodiment of diaper 100, and wherein top flat 104 and egative film 102 are common extensions, and has length and the width bigger than absorbent article core 106.Top flat 104 is connected with egative film 102 and overlaps, and forms the periphery of diaper 100 thus.This periphery has been determined the periphery or the edge of diaper 100.This periphery comprises end edge 101 and longitudinal edge 103.
Top flat 104 is submissive, soft and non-stimulated to wearer's skin.In addition, this top flat 104 is can be fluidic thoroughly, allows liquid to pass its thickness at an easy rate.Suitable top flat can be made by for example perforated foams, reticulated foam, foraminous plastic sheeting, natural fiber (for example wood or cotton fiber), synthetic fibers (for example polyester or polyethylene fibre), is perhaps made by the mixture of natural fiber and synthetic fibers.Egative film 104 is preferably made by hydrophobic material so that the fluid in wearers skin and the absorbent article core 106 is separated.
Particularly preferred top flat 104 for example comprises by Hercules, Inc.of Wilmington, the Hercules class 151 polyacrylic polypropylene fibres with shearing length (staple length) of about 1.5 Denier of Delware registration.Noun used herein " shearing length fiber " refers to has at least approximately those fibers of 15.9mm (0.62 inch) length.
Many technology that can be used to make top flat 104 are arranged.For example, this top flat 104 can be weaving, on-woven, spunbond, combing etc.Preferred top flat is the method combing known of the technical staff by the fabric technology field and heat bonding.Top flat 104 preferably has from about 18g/m
2To about 25g/m
2Weight, the minimum dry hot strength of machine direction is at least approximately 400g/cm, is about at least 55g/cm at the wet tensile strength with the vertical direction of machine direction.
Egative film 102 is fluid-tight, and preferably by the thin plastic manufacturing, can certainly use the not saturating fluent material of other flexibilities.Egative film 102 can prevent to be absorbed by absorbent article core 106 and remain in drainage fluid in the absorbent article core get wet for example sheet of touching diaper 100 and the articles for use of underwear.Although also can use the fluent material thoroughly of other flexibilities, egative film 102 preferably has the polyethylene film of the thickness from about 0.012mm (0.5 Mill) to about 0.051cm (2.0 Mill).Noun used herein " flexibility " refers to submissive and is easy to and the general shape of wearer's body and the material that profile phase is fitted.
The FilmNo.8020 trade mark is made and be registered as to a kind of suitable polyethylene film by Monsanto Chemical Corporation.Egative film 102 is preferably handled through embossing and/or delustring, so that an outward appearance that more resembles fabric is provided.In addition, egative film 102 can allow dampness to shed from absorbent article core 106, prevents to drain fluid simultaneously and passes egative film 102.
The size of egative film 102 is by the size of absorbent article core 106 and selected diaper design decision.In a preferred embodiment, egative film 102 has improved hourglass shape, and extends beyond the minimum range of the about at least 1.3cm of absorbent article core 106 to about 2.5cm (about 0.5 to about 1 inch) along whole diaper periphery.
Any suitable method of top flat 104 and egative film 102 usefulness links together.Noun used herein " connection " comprise by top flat 104 directly being fixed on the egative film 102 and with top flat 104 directly be connected on the egative film 102 structure and by top flat 104 is fixed on the medium element, this medium element then is fixed on the egative film 102 and top flat 104 is connected structure on the egative film 102 indirectly.In a preferred embodiment, top flat 104 and egative film 102 directly are fixed together by for example bonding agent or any other fixing means well-known in the art at the periphery of diaper.For example, uniformly continuously the lines or the point of the discrete bonding agent of bond layer, the bond layer that figure is arranged or string can be used for top flat 104 and egative film 102 are fixed together.
Strap fixture (for the sake of clarity not shown) generally is used in the back side of waist area of diaper 102 so that a fixture that diaper and wearer are linked together is provided.It can be the fixedly strap of knowing in the art that strap is decided part, for example this as the United States Patent (USP) that licenses to Buell on November in 1974 19 3,848,594 of reference in disclosed fixedly strap.These strap fixtures or other diaper fixtures generally are configured in the corner place near diaper 100.
Elastic component (for the sake of clarity also not shown) preferably is configured on the periphery of diaper 100 along each longitudinal edge 103, so that this elastic component can be held diaper 100 and be fixed on wearer's the lower limb.Elastic component also can be configured in one or two end edge of diaper 100 so that provide a belt and lower limb hoop or replacement lower limb hoop.For example, in licensing to the United States Patent (USP) 4,515,595 of Kievit etc. this 7 days May in 1985 as a reference a suitable belt is disclosed.Method and apparatus that be fit to make disposable diaper in addition with the collapsible elastic component of elasticity on March 28th, 1978 license to Buell in this United States Patent (USP) 4,081,301 as a reference, description is arranged.
But above-mentioned elastic component is fixed on the diaper 100 with the elastic shrinkage state, and when being in the shape of normal not constraint with convenient diaper 100, this elastic component can shrink or gather this diaper effectively.Have at least two kinds of methods that but elastic component is fixed with the elastic shrinkage state.For example when diaper 100 was in not contraction state, this elastic component can stretch and be fixing.Another kind method is when diaper 100 is in not loose or be extended configuration, and diaper 100 is shunk, and elastic component is fixed and is connected on the diaper 100.This elastic component can extend in a zone of the length of diaper 100.This elastic component also can extend on the whole length of diaper 100, or extends on any other suitable length, so that an elasticity shrinkable threads is provided.The length of this elastic component is by the design decision of diaper.
Above-mentioned elastic component can have multiple structure.For example, the width of elastic component can be from about 0.25mm (0.01 inch) to about 25mm (1.0 inches) or more; This elastic component can comprise the single strand of elastomeric material or can comprise several parallel or uneven strands of elastomeric material; Perhaps this elastic component can be rectangle or curve.In addition, this elastic component can be with any being fixed on the diaper in the method well known in the art.For example, this elastic component can be received on the diaper 100 or this elastic component can be adhesive on the diaper 100 simply by various bonding figure ultra-sonic welded, heating and pressure bonding.
The absorbent article core of diaper 100 is between top flat 104 and egative film 102.Absorbent article core 106 can be made various sizes and shape (for example, rectangle, hourglass shape, asymmetric shape etc.).Total moisture absorption capacity of absorbent article core 106 should estimate that the design fluid displacement that uses is consistent with absorbent device or diaper.In addition, the moisture absorption capacity of absorbent article core 106 and size can change so that be fit to from the baby to the wearer who is grown up.
As shown in Figure 2, absorbent article core 106 comprises fluid distribution member 108 of the present invention.In preferred construction for example shown in Figure 2, absorbent article core 106 preferably includes that be communicated with fluid distribution member 108 fluids and a collecting layer between fluid distribution member 108 and top flat 104 or a collecting part 110.This collecting layer or collecting part 110 can be by comprising for example polyester, polypropylene or poly synthetic fibers, the non-woven web of the mixture of for example cotton or cellulosic natural fiber or these fibers or several different materials of textile web, or any equivalent material or mixtures of material are made.
In use, the back waist area of diaper 100 is placed on wearer's back, then the remainder of diaper 100 is pulled between wearer's two thighs so that Attacking Midfielder's zone of this diaper is placed on wearer's front portion.Strap or other fixtures preferably are fixed on the zone toward the outer side of diaper 100.In use, the disposable diaper or other absorbent devices that comprise fluid distribution member of the present invention can distribute and store fluid more quickly and effectively, and because the bigger moisture absorption capacity of this fluid distribution member, so can keep this disposable diaper or other absorbent device dryings.The disposable diaper that comprises fluid distribution member of the present invention also can thinner and more have flexibility.
The concrete composition of fluid distribution member of the present invention, quantitatively and density feature should adjust to meet the concrete absorbent device or the requirement of product purpose.When selecting concrete fluid distribution member material, the important product parameters that should consider comprises: the fluid volume that the overall dimension of absorbent device, this absorbent device must absorb, the fluidic characteristic that will absorb.Along with the difference of concrete product or absorbent device purposes, other conditions may also be important.
More than describe the scope of the useful constituent of relevant building block in detail.Proved be suitable for use in absorbent device exemplary quantitatively and the material of density comprise having quantitatively between about 15 to about 350gsm, density at about 0.03g/cc (grams per milliliter) to the material between about 0.20g/cc.Density can be calculated as follows according to thickness quantitative and that measure under one of for example 0.20psi given qualification pressure:
Density (g/cc)=quantitative (gsm)/[10,000 * thickness (cm)]
Fluid distribution member of the present invention also can be in structure, quantitatively and/or different on forming.So according to specific use, it is desirable setting up gradient on any given direction in this distribution member or the several direction.
Although this paper has described specific embodiments of the invention, be understood that, for those skilled in the art, under situation without departing from the spirit and scope of the present invention, can make each and change and remodeling.Therefore, the variation in all these present technique fields and remodeling all comprise in claims of the present invention.
Claims (10)
1. one is distributed and the fluidic hygroscopic part of storage human body, it is characterized in that this hygroscopic part comprises:
(a) 20% to 80%, preferably 45% to 60%, be most preferably that 45% chemistry is stiffening, twisting and the swelling fiber that curls;
(b) 10% to 80%, preferably 30% to 45%, be most preferably 45% the very big fiber of eucalyptus surface area; With
(c) 0% to 50%, preferably 5% to 15%, be most preferably 10% thermoplasticity bondable fibers.
2. hygroscopic part as claimed in claim 1 is characterized in that this thermoplasticity bondable fibers is a thermoplasticity bi-component bondable fibers.
3. hygroscopic part as claimed in claim 1 or 2 is characterized in that this hygroscopic part is one deck wet-laid web.
4. as each described hygroscopic part among the claim 1-3, it is characterized in that the big fiber of this eucalyptus surface area is the big fiber of yate class surface area.
5. as each described hygroscopic part among the claim 1-4, its feature is that also this hygroscopic piece is by mechanical softening.
6. one is distributed and the fluidic absorbent structure of storage human body, and this absorbent structure comprises fluid collection parts and a fluid dispensing components, it is characterized in that this fluid dispensing components comprises:
(a) 20% to 80%, preferably 45% to 60%, most preferably be that 45% chemistry is stiffening, twisting and the swelling fiber that curls;
(b) 10% to 80%, preferably, most preferably be 45% the big fiber of eucalyptus surface area 30% to 45%; With
(c) 0% to 50%, preferably, most preferably be 10% thermoplasticity bondable fibers 5% to 15%.
7. absorbent structure as claimed in claim 6 is characterized in that this absorbent structure also comprises a secondary fluid distribution member, and this secondary fluid distribution member comprises:
(a) 20% to 80%, preferably 45% to 60%, be most preferably that 45% chemistry is stiffening, twisting and the bulking fiber that curls;
(b) 10% to 80%, preferably, be most preferably 45% the big fiber of eucalyptus surface area 30% to 45%;
(c) 0% to 50%, preferably, be most preferably 10% thermoplasticity bondable fibers 5% to 15%.
8. absorbent structure as claimed in claim 7 is characterized in that this fluid distribution member has different compositions with this secondary fluid distribution member.
9. absorbent device, preferably a kind of diaper or menopad, the human body fluid can be collected, distributes and be stored to this absorbent device, this absorbent device comprises a top flat, an egative film and the absorbent structure between this top flat and this egative film, this absorbent structure comprises a fluid dispensing components, and this absorbent device is characterised in that this fluid distribution member comprises:
(a) 20% to 80%, preferably 45% to 60%, be most preferably that 45% chemistry is stiffening, twisting and the swelling fiber that curls;
(b) 10% to 80%, preferably, be most preferably 45% the big fiber of eucalyptus surface area 30% to 45%;
(c) 0% to 50%, preferably, be most preferably 10% thermoplasticity bondable fibers 5% to 15%.
10. make the method for distributing and storing the fluidic hygroscopic part of human body for one kind, it is characterized in that this method comprises the steps:
(a) preferably form a kind of mixture of fibrous material, comprising by wet laying process:
(i) 20% to 80%, preferably 45% to 60%, be most preferably that 45% chemistry is stiffening, twisting and crooked swelling fiber;
(ii) 10% to 80%, preferably, be most preferably 45% the big fiber of eucalyptus surface area 30% to 45%;
(iii) 0% to 50%, preferably, be most preferably 10% thermoplasticity bondable fibers 5% to 15%; With
(b) the above-mentioned thermoplastic fibre of heat bonding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96192736 CN1179091A (en) | 1995-02-03 | 1996-01-26 | Fluid distribution member for absorbent articles exhibiting high suction and high capacity |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/382,817 | 1995-02-03 | ||
| CN 96192736 CN1179091A (en) | 1995-02-03 | 1996-01-26 | Fluid distribution member for absorbent articles exhibiting high suction and high capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1179091A true CN1179091A (en) | 1998-04-15 |
Family
ID=5128436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96192736 Pending CN1179091A (en) | 1995-02-03 | 1996-01-26 | Fluid distribution member for absorbent articles exhibiting high suction and high capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1179091A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103598951A (en) * | 2013-11-21 | 2014-02-26 | 常熟南师大发展研究院有限公司 | Siphon type sanitary napkin |
-
1996
- 1996-01-26 CN CN 96192736 patent/CN1179091A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103598951A (en) * | 2013-11-21 | 2014-02-26 | 常熟南师大发展研究院有限公司 | Siphon type sanitary napkin |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1031035C (en) | Absorbent structures containing superabsorbent material and web of wetlaid stiffened fibers | |
| CN1035715C (en) | Absorbent structures containing stiffened fibers and superabsorbent material | |
| JP3431169B2 (en) | Layered multifunctional fluid absorbing member | |
| CA2211737C (en) | Fluid distribution member for absorbent articles exhibiting high suction and high capacity | |
| KR100341202B1 (en) | High capacity fluid absorbent members | |
| CN1086989A (en) | Absorbent item with improved longitudinal fluid movement performance | |
| CN1612803A (en) | Method of making shaped components for disposable absorbent articles | |
| SE508961C2 (en) | Absorbent structure and absorbent articles containing the structure in question | |
| CN1299262A (en) | Absorbent article having improved integrity and acquisition | |
| CN1158558A (en) | Absorbent comprising upper and lower gel layers | |
| CN1379649A (en) | Sanitary absorbent napkin | |
| KR20000016200A (en) | Absorbent structure, and production of absorbent structure by mat formation together with adhesive bonded layer | |
| CA2334343A1 (en) | Unitary absorbent structure containing superabsorbent polymer | |
| JP2003290281A (en) | Absorptive article | |
| CN1179091A (en) | Fluid distribution member for absorbent articles exhibiting high suction and high capacity | |
| CN1085520C (en) | Absorbent articles, especially catamenials, having improved fluid directionality | |
| MXPA98008584A (en) | High capacity absorbing members of flu |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |