CN1387424A

CN1387424A - Helically wound absorbent element and method for forming

Info

Publication number: CN1387424A
Application number: CN00815214A
Authority: CN
Inventors: J·迪帕尔马
Original assignee: Kimberly Clark Worldwide Inc
Current assignee: Kimberly Clark Worldwide Inc; Kimberly Clark Corp
Priority date: 1999-09-15
Filing date: 2000-08-28
Publication date: 2002-12-25
Also published as: BR0014009A; AU6942000A; AR025666A1; WO2001019312A1; MXPA02001872A; GB2370784B; KR20020026271A; DE10084990T1; GB2370784A; GB0208625D0

Abstract

Absorbent pad assemblies and articles are provided wherein absorbent pad materials are adjacently disposed relative to each other and have an edge surface angularly orientated relative to the longitudinal axis thereof. Also provided is a method for forming an absorbent article having an absorbent pad assembly with an outer fluid-contacting surface including discrete portions of different absorbency. At least first and second absorbent pad materials are helically wound adjacently about a shaft member whereby at least a portion of each of the first and second absorbent pad materials includes an outer surface exposed portion.

Description

Absorbent item that spiral type is twined and preparation method thereof

Invention field

The present invention relates generally to the absorbent item of absorb body fluids and secretions.More specifically, the present invention relates to absorption pad assembly and relevant absorbent item, this absorbent item has improved antiseep and/or fluid flow control function, the invention still further relates to the method for making the absorbing structure with improved antiseep and/or fluid flow control function.

Background of invention

Everybody knows in technical field polytype structure, particularly disposable absorbent article as absorbent item are used for absorbing various body fluid and secretions.The absorbent item commodity comprise diaper, adult-incontinence articles, sanitary towel and binder.The disposable products of these types generally include reception, absorb and keep fluidic composition.Particularly, the composition of this absorbent item comprises the top layer of a fluid permeable, an absorbent cores and the impermeable bottom of liquid.

Overlapping or the arrangement of this typical absorbent item composition mean level, the surperficial facing fluid uptake zone of its principal plane, for example, wearer's health.Use this absorbent item, when fluid passed across level course or lamination, fluid may change by the attribute or the composition of part.Therefore, has our undesirable horizontal relationship between each composition of this absorbent item.In addition, the fiber orientation of forming absorbent cores usually is random, and the fiber in the mat laterally is adjacent to arrange, and makes the fluid that absorbs typically be radiation mode or shape outflow.

One of main purpose of development absorbent item is the application of absorptive capacity in increase, improvement or the maximum absorption articles for use.Usually, the product of the above-mentioned type typically distributes the fluid that is deposited on top layer with ring-type.Because the general length of this structure surpasses its width, so this liquid method of salary distribution may cause undesirable for example fluid to ooze out, before utilizing the end region absorptive capacity of absorbent item, fluid arrives the side longitudinally of absorbent item earlier.Do not utilize the absorptive capacity of absorbent item end although be appreciated that this situation, increased the probability of side leakage.

In addition, this absorbent item is owing to be subjected to the influence of the environment for use of intrinsic factor or absorbent item, and it can have in a use widely and the range of application.Therefore, being absorbed fluidic characteristic or parameter may change, and these parameters comprise flow velocity and form, state or composition.For example, seepage may be heterogenetic and uneven, as comprising erythrocyte, mucin, blood plasma and fragment of tissue etc. in the menses.

Be sanitary towel's (also claiming menopad) that the women designs, sanitary pad, ight protective pad, panty girdle and close-fitting protective pad are before the menstruation, be used for absorbing effusive menses and other human secretions after intermenstrual period and the menstrual phase.Sanitary towel is the external article, is designed to aim at the pudendum part near health, generally limits its position on the underwear by pasting or mechanically being fixed on.Sanitary towel typically is different from panty girdle and close-fitting protective pad several aspect noticeable, and sanitary towel's stock size is big, and the 3 dimension structures that limit are more arranged, and surveys thicklyer with slide calliper rule, and fluid displacement is bigger than panty girdle or close-fitting protective pad.

Because hope provides enhanced comfortableness to the wearer and reduces the outward appearance of this absorbent item, further requires this absorbent item that smaller volume is arranged.Therefore, need the absorption pad assembly and the absorbent item of improvement, thereby cause utilizing more completely its absorptive capacity, more effective possible operation widely and service condition that adapts to absorption pad assembly and absorbent item efficiently that reach.

In addition, require the absorbing structure relevant, easier while or the approximate absorbefacient absorbing material of selected difference that simultaneously this body fluid flowed to the absorbability of specific body fluid.In addition, need the improved technology or the method for making this absorbing structure.Particularly, need this manufacturing technology or method simpler effectively than existing or known technology or method.

Summary of the invention

General objects of the present invention provides a kind of improved absorption pad assembly and absorbent item.Another object of the present invention provides a kind of improved method of making absorption pad assembly, absorbent item or other selected absorbing structures or product.

Of the present invention one more specifically purpose be to solve above-mentioned one or more problems.

Can reach by a special absorption pad assembly, reach general objects of the present invention to small part.Absorption pad assembly according to a preferred embodiment of the present invention has a longitudinal axis, and comprise having first kind of absorbefacient first kind of absorbent pad material of preliminary election, with have second kind of absorbefacient second kind of absorbent pad material of preliminary election, wherein first kind is different with second kind of preliminary election absorbability.First kind of absorbent pad material of at least a portion and second kind of absorbent pad material of at least a portion are placed adjacent one another, and first kind of absorbent pad material of at least a portion and second kind of absorbent pad material of at least a portion respectively have an edge surface with respect to the longitudinal axis angle to be arranged.

The absorption pad assembly of prior art and absorbent item generally all do not have fully or fully to utilize the absorptive capacity of absorbing structure separately with desired the same.The absorption pad assembly of prior art and absorbent item are general also not with desired the same effective and adapt to the possible operation widely and the service condition of its application efficiently.Particularly, the absorption pad assembly of prior art generally can be the same not simple with desired structure, making and/or composition with absorbent item.

The present invention further comprises a kind of special absorbent item.Absorbent item according to a preferred embodiment of the present invention has a longitudinal axis, and comprises an absorption pad assembly that forms the external fluid contact surface.This absorption pad assembly comprises first kind, second kind and the third absorbent pad material, the absorbability that preliminary election is separately all arranged, wherein the preliminary election absorbability of second kind of absorbent pad material is different with the preliminary election absorbability of first kind of absorbent pad material, and the preliminary election absorbability of the third absorbent pad material is different with the preliminary election absorbability of second kind of absorbent pad material.First kind of absorbent pad material of at least a portion and second kind of absorbent pad material of at least a portion are placed adjacent one another, and first kind of absorbent pad material of at least a portion and second kind of absorbent pad material of at least a portion respectively have an edge surface with respect to the longitudinal axis angle to be arranged.In addition, second kind of absorbent pad material of at least a portion and the third absorbent pad material of at least a portion are placed adjacent one another, and with respect to the longitudinal axis angle are arranged.

Another aspect of the present invention relates to a kind of specific process that is manufactured with the absorbent item of absorption pad assembly, and the external fluid contact surface of this absorption pad comprises different absorbefacient separating parts.According to a specific embodiment, the method comprises to first kind of major general and second kind of absorbent pad material and being wrapped on the part with being adjacent to spiral type, thereby first kind and second kind of absorbent pad material respectively have at least a portion to comprise the outer surface expose portion.

The present invention further comprises the method for the absorbent item that is manufactured with the absorption pad assembly, and this absorbent item has a longitudinal axis and external fluid contact surface, and this fluid contact surface comprises different absorbefacient separating parts.According to one embodiment of present invention, the method comprises to first kind of major general, second kind and the third absorbent pad material and is wrapped on the part with being adjacent to spiral type, thereby first kind, second kind and the third absorbent pad material respectively have at least a portion to comprise the outer surface expose portion, then, the absorption pad assembly is flattened along its longitudinal axis.To comprise the absorbent cores that flattens the absorption pad assembly then and be placed between bottom and the top layer, to form absorbent item.

Can be understood as at this applied term " absorbent item " and to refer to following products: diaper, sanitary towel, shorts, incontinence article, ight protective pad, sanitary pad, oxter protective pad and similar products are used for absorb body fluids and secretions such as urine, menses, blood, antiperspirant and other secretions of being discharged by human body.

From the following detailed description, and appending claims and accompanying drawing, those skilled in the art obviously is appreciated that other purposes of the present invention and advantage.

Brief description of the drawings

Fig. 1 is according to a preferred embodiment of the present invention, has the part of the absorption pad assembly schematic perspective view of relevant axle.

Fig. 2 is the part of absorption pad assembly schematic perspective view according to a further advantageous embodiment of the invention.

Fig. 3 is the part enlarged drawing of the end of the absorption pad assembly shown in Fig. 2.

Fig. 4 is a part of side view of absorption pad assembly according to an embodiment of the invention.

Fig. 5 illustrates the perspective view of the making of absorption pad assembly according to an embodiment of the invention.

Fig. 6-the 9th, the side view of simplifying illustrates the position of the part of different absorbing materials according to an embodiment of the invention.

Figure 10-the 12nd, the part vertical view of the simplification of the absorbent item of alternate embodiments according to the present invention.

Figure 13-the 15th, the part side view that the absorbent item of the embodiment that can select according to the present invention is simplified.

The detailed description of the preferred embodiment of the present invention

To describe the present invention in more detail below, a kind of improved absorption pad assembly and absorbent item will be provided, and make the method that these absorb product.

Beginning is referring to Fig. 1, and it shows an absorption pad assembly according to an embodiment of the invention, is designated as Reference numeral 30 usually, and it has a longitudinal axis that is designated as Reference numeral 32.Those skilled in the art will appreciate that according to of the present invention and following these absorption pad assemblies in greater detail in absorbent item or as the part of absorbent item, to have special application, as generally can absorb body fluids.According to absorbent item of the present invention following form can be arranged: the absorption product of diaper, shorts, sanitary towel, sanitary pad, ight protective pad, incontinence article, oxter protective pad or other types, can absorb one or more body fluid, as urine, menses, blood, antiperspirant, feces or similar secretions.Be appreciated that this absorbent item typically has disposable characteristics.

The initial concrete application of the present invention is feminine care or its part, sanitary towel or similarly shape in this way.Therefore, will be referred to the concrete application of this series products below.But, can be understood as and should in no way limit practice widely of the present invention, if be ready, the present invention also can use or in conjunction with the other types or the form of absorbent item, as previously discussed.

Absorption pad assembly 30 generally includes three or three layers of absorbent pad material of adjacent winding, respectively is appointed as 34,36 and 38, generally is wrapped on columniform axle or the bar 40.Be used for ideal absorbent pad material net sheet of the present invention, as shown in the figure, every kind of net sheet all is successive form, produces and installs thereby simplified, and practice widely of the present invention needn't be subjected to this restriction.For example, if be ready, can use the similar absorbent pad material of part of disconnection.

Every kind of absorbent pad material net sheet 34,36 and 38 respectively comprises an edge surface, is appointed as 34a, 36a and 38a respectively.As shown in the figure, every kind of absorbent pad material net sheet 34,36 and 38 twines around the longitudinal axis 32, as axle 40, so that edge surface 34a, 36a and 38a have an angle with respect to the longitudinal axis 32 separately.Therefore, be appreciated that selected absorbent pad material or the absorbent pad material net sheet that absorption pad assembly according to the present invention is not a monolayer.

In addition, as shown in Figure 1, the outer surface 41 of absorption pad assembly 30 normally is made up of the section 42 of absorbent pad material net sheet 34,36 and 38 respectively.According to a preferred embodiment of the present invention, this outer surface 41 as shown, normally is made up of the section 42 of absorbent pad material net sheet 34,36 and 38 respectively.This can be understood as, and this absorption pad assembly can provide an outer surface of being made up of various selected materials, and can provide improved performance characteristics in concrete product is used.

The absorbent pad material that in concrete the application, is fit to, as sanitary towel in the feminine care or similar products, it in technical field called optical imaging, the concrete absorbent pad material of using will be in following discussion in this absorbent item, and common every kind of absorbent pad material net sheet 34,36 preferably has the preliminary election absorbability consistent with the preliminary election absorbability of the absorption pad assembly 30 that will use with 38.

Every kind of absorbent pad material net sheet 34,36 and 38 can be made by the material that is same or different from other net sheets in this structure, and this is desirable.Usually but the possible advantage of being brought in order to realize application of the present invention more up hill and dale wishes that generally adjacent absorbent pad material net sheet has different absorbabilitys in practice.

In addition, the simplest shape of the present invention is to have only two kinds of absorbent pad material net sheets, and according to certain preferred embodiment, the absorption pad assembly is made up of three kinds or more kinds of absorbent pad material.For example, additional absorbent pad material inclusions may allow this structure that the more products design characteristics is arranged.As a result, product can more clearly provide specific performance properties characteristics and quality, and this point needs in specific application.

Those skilled in the art will appreciate that and to utilize the whole bag of tricks to realize this absorbefacient difference.For example, this different absorbability can be realized by the material that application has different chemical composition and/or physical characteristic such as density.Therefore, extensive use of the present invention is not produced or is realized the restriction of the absorbefacient particular technology of this difference.

Realize that the absorbent pad material that is fit to that the present invention uses comprises various absorbing materials and the material that hinders the fluid transmission, this point is that everybody knows technically.

For example, the absorbing material of selecting during the present invention uses can be made by the natural absorbing material or the synthetic fibers of various hydrophilics, comprises the mixture of spun-bonded fibre, wood pulp cellulose, regenerated cellulose, cotton fiber or other fibers that cellulose fibre, surfactant are handled.

The absorbing material that the present invention uses comprises a kind of material that is called coform usually, describes to some extent in United States Patent (USP) 4100324, fully in conjunction with its disclosure for your guidance.Coform can buy from the Kimberly-Clark company of state of Wisconsin Neenah, it generally is a kind of non-woven material, form with the air-flow shaping matrix (airform matrix) of multiple different wood pulp cellulose by the thermoplastic poly condensating fiber, and the finishing agent of textile-like is arranged.The average diameter of the polymer of thermoplastic fibres is usually less than 10 microns, and various wood pulp celluloses pass matrix distribution, and is used for making these microfibres to be separated from each other.The making of this material is second air-flow that has first air-flow of the microfibre that melts and sprays by application at first and comprise wood pulp cellulose, and merges these two kinds of air-flows under turbulent condition, forms combined airflow along molded surface.

In certain embodiments, need to use absorbent pad material with fast Absorption material behavior.Various Woven fabrics and nonwoven web can be used for forming the fast Absorption material.For example, a kind of fast Absorption material can melting and spraying or non-woven fabric layer that spunbond net is formed by polyolefin filaments.This non-woven fabric layer can comprise conjugate fibre, bicomponent fibre and homopolymer fibre or other length, and the mixture of the fiber of this fiber and other types.This fast Absorption material also can be by carding fiber net or bonding the making of air lay fleece natural and/or that synthetic fibers are formed.Adherent carding fiber net for example, is the adherent carding fiber net of carding fiber net, infrared ray of powder-stuck or by the adherent carding fiber net of air.Adherent carding fiber net can be random the mixing that comprises a kind of mixture or different fibers, selected fibroreticulate fibre length about 3 millimeters in about 60 millimeters scope.

Concrete fast Absorption examples of material can find in the United States Patent (USP) 5364382 of people's such as Ellis United States Patent (USP) 5490846 and Latimer.The fast Absorption material can be made by waterproof material basically, and waterproof material can optionally be handled through surfactant, thereby perhaps other processing reaches wettability and the hydrophilic that needs.

The another kind of absorbing material that may be fit to is the material that can buy from Kimberly-Clark company of a kind of PRISM of being called.This PRISM describes in people's such as Strack United States Patent (USP) 5336552, fully in conjunction with the disclosure of this patent for your guidance.PRISM generally is a supatex fabric, comprises the multicomponent polymerization twisted wire that comprises the first and second polymerization compositions of extruding, is positioned at very unique zone of passing multicomponent twisted wire cross section, extends along the length of multicomponent twisted wire continuously.Be preferably, twisted wire is the successive filament that is formed by spunbond technology.Second composition of twisted wire constitutes at least a portion outer surface of multicomponent twisted wire, extends along the length of multicomponent twisted wire continuously, and comprises the mixture of polyolefin and vinyl alkyl acrylate copolymer.Bonding between the multicomponent twisted wire by adding thermosetting.More specifically, the first polymerization composition of multicomponent twisted wire 20% to 80%, the second polymerization composition that accounts for the twisted wire gross weight accounts for 80% to 20% of twisted wire gross weight.Be preferably, 40% to 60%, the second polymerization composition that the first polymerization composition of multicomponent twisted wire accounts for the twisted wire gross weight accounts for 60% to 40% of twisted wire gross weight.

Term " twisted wire " is used for representing polymer is passed the elongated extrudate of setting hole such as punch die formation here, and twisted wire comprises fiber, and it is discontinuous twisted wire with qualification length, and filament is the continuous twisted wire of material.Supatex fabric of the present invention can be made by the multicomponent staple fiber.This staple fiber can be by combing and bonding formation supatex fabric.But, being preferably, supatex fabric of the present invention forms in molded surface extruding, stretching, the afterturn of moving with successive spunbond multicomponent filament.

The type of adaptable non-woven material comprises the adherent carding fiber net of carding fiber net, infrared ray of powder-stuck and passes through the adherent carding fiber net of air.Infrared ray and can optionally comprise mixture of different fibers by the adherent carding fiber net of air, the fibre length of selected fabric wire side can be in 1.0 inches to 3.0 inches scope, and average bulk density approximately is that 0.02g/cc is to 0.12g/cc.

Realize that other suitable absorbing materials that the present invention uses can comprise the material that is commonly referred to superabsorbent.Known superabsorbent materials comprises the W77553 and the FAV880A of Stockhausen company commercialization of AFA-130-53C, the North Carolina state Greensboro of Dow chemical company.The W77553 of Stockhausen company is a large amount of polymeric polyacrylate of handling through hydrophobic surface.The FAV880A of Stockhausen company has the superabsorbent on highly cross-linked surface.AFA-130-53C is the polyacrylate material of 850 to 1400 microns suspension polymerisations can having bought from the Dow chemical company of state of Michigan Midland.

Hydrocolloid material is commonly referred to as superabsorbent material, be that water-fast, the crosslinked a little branch that aggregates into by the hydrogel shape forms, and part is neutral.Can make by unsaturated polymer, acid conjugate with monomer and cross-linking agent.This superabsorbent material can be at people's such as Meyers United States Patent (USP) 4798603, people's such as people's such as the Brandt that reissues patent 32649 and Pedersen United States Patent (USP) 4467012, and the european patent application 0339461 of the Kellenberger that is publishing.These patents and European patent be disclosed in this fully in conjunction with for your guidance.

In addition, the material that is called " low speed " superabsorbent also can be applied in the practice of the present invention.The meaning of " low speed " superabsorbent is to have soak time index (ATI) at least 5 minutes, is preferably more than 10 minutes superabsorbent.Can adjust the absorption rate of superabsorbent by the chemical property of revising particle size, surface properties and polymer.This low speed superabsorbent has more detailed description in people's such as Anderson United States Patent (USP) 5843063, at this fully in conjunction with the disclosure of this patent as a reference.

The absorbing material that is fit to use in the present invention's practice also can be the form of absorbent foam materials, as the opening polyurethane foamed material, this material is disclosed in people's such as Faulks the United States Patent (USP) 5853402, at this fully in conjunction with the disclosure of this patent as a reference.In addition, also can use the starching foamed materials, as be disclosed in the material in the United States Patent (USP) 5506277 of Griesbach III, fully as a reference in conjunction with the disclosure of this patent at this.

Be fit to absorbent pad material of the present invention and can use corrugated supatex fabric, as be disclosed in the wrinkling supatex fabric of large volume in the United States Patent (USP) 3668054 of Stumpf, fully as a reference in conjunction with the disclosure of this patent at this.Wherein disclosed material as fiber, generally comprises a wrinkling fleece, and this fleece is that the weaving fiber of alignment is at first implanted in the continuous elongate thin film of the thermoplastic binding agent that has fixed thickness basically.Then this synthetic fleece adhesive material is wrinkled, form many wrinkles and groove, these wrinkles are connected the side near its root and along it separately brokenly with groove.

Be appreciated that the material that is fit to use in the present invention's practice can be various multi-form, comprise being melted and sprayed or material that air lay or air-flow are shaped.Term " spun-bonded fibre " refers generally to pass many meticulous, normally Yuan Xing punch die capillary tube is by being squeezed into the thermoplastic of fusing the fiber or the formed fiber of filament of fusing, and enter polymeric high velocity air (as air), this air-flow attenuates the thermoplastic filament of fusing, reduces its diameter.Then, high velocity air is taken away spun-bonded fibre and be deposited on the cohesion face, forms the melting fiber net that distributes arbitrarily.Melting fiber can be successive, also can disconnect, and when general some viscosity of time on the cohesion face of being deposited on.Spunbonded materials has a large amount of descriptions in people's such as Vogt United States Patent (USP) 5656361, at this fully in conjunction with its disclosure as a reference.

In addition, contain or comprise one or more different additives such as coagulating agents in the structure of absorbent pad material, also can use lytic agent or superabsorbents.For example, adjacent absorbent pad material is preferably its one or more attributes or characteristics difference, as chemical constituent or structure, as machine direction or thickness.According to a preferred embodiment of the present invention, this adjacent absorbent pad material is preferably on selected attribute or characteristics different, rather than different on the characteristics that density and other prior aries are difficult for obtaining.Particularly, the horizontal dependency that reduces or eliminates adjacent absorbent pad material can cause selected material can use special attribute or characteristics.

Those skilled in the art will appreciate that also and instruct, in practice of the present invention, can transmit isolated materials with various suitable fluids according to the technology that provides here.Particularly, the separator (being also referred to as " the control wall flows " or " fluid flow control wall " sometimes) that is formed by isolated material can adopt various forms, and has certain predetermined permeability.In addition, this separator can specific forms be incorporated in absorption pad assembly and the absorbent item, for example is used to provide or causes the control of specific fluid flow or handle.

For example, according to the present invention, incorporating one or more separators in absorption pad assembly and the absorbent item into, for the fluent material of controlled or adjustment, can be semi permeable or impervious, and everybody expects especially in concrete the application for this.In addition or alternatively, the separator that one or more are incorporated in specific absorption pad assembly and the absorbent item according to the present invention can be the form of fluid flow guiding material.

Separator during the present invention uses can be made by the infiltrative material of various suitable preliminary elections, and this point is being that everybody knows in the art.Depend on concrete application, suitable impermeable separator is that everybody coating of knowing or thin film are used for stoping the fluid transmission in the art.For example, this impervious coating or thin film are fit to be applied to bottom, thereby form an impervious separator.In addition, according to specific application, suitable impermeable separator comprises as above-mentioned impermeable back sheet material, or do not have absorbefacient foam plastics such as sealing unit, and crosslinked or noncrosslinking foamed polyolefine plastic comprises as polypropylene or polyethylene foams.The example that is applied to commercial foam plastics of the present invention comprises that the trade mark that the SealedAir company of New Jersey Fair Lawn produces is the foam plastics of CA-30, and the trade mark that the Astro-Valcour company of New York Glens Falls produces is the foam plastics of AF-030.

Semi-permeable separator comprises the material that only allows the transmission particular fluid.For example, the fluid that wherein flows through can be filtered or be screened to the inclusions of this semi-permeable separator.According to specific application, the semi-permeable separator that is fit to comprises thin film or Web materials porous or perforation, the material of describing in people's such as people's such as Saferstein United States Patent (USP) 4616644 and Jackson the United States Patent (USP) 5643240 for example, at this fully for your guidance in conjunction with its disclosure.For example, a series of lightweight supatex fabric that obtained through extruding, embossing and directional process by high density polyethylene (HDPE) or polypropylene are disclosed in the United States Patent (USP) 4616644, be called the Delnet thin film, can buy from Hercules company, disclose a kind of suitable apertured film in the United States Patent (USP) 5643240 and be called AET polyethylene CKX215 thin film, by the AppliedExtrusion Technology production of U.S. Te Lihua state Middleton.

The effect of orientation or water conservancy diversion separator resembles check-valves, allows fluid to pass through in one direction.For example, the apertured film that is used for upper surface or body side surface in this absorbent item is used as this purpose exactly.

Therefore, the separator during the present invention uses can be made of various thin film, foam plastics and similar material.In addition, according to specific preferred embodiment of the present invention, one or more separators can be the forms of thin film, foam plastics or similar material, and are soluble after touching fluid, thereby play the effect of time relase.

In addition, be appreciated that extensive use of the present invention should not be confined to specific absorbent pad material,, can use other absorbent pad material that the technical staff in this field knows if be ready.For example, designed and developed material numerous in variety to adapt to the applied various situations of these products.

Get back to Fig. 1, axle 40 is illustrated as has common circular cross section, if be ready, can use shape or axle type that other are fit to.For example, if be ready, can use axle with ellipse or rectangular cross section.

In addition, absorption pad assembly 30 shown in Figure 1 is illustrated as with axle 40 and links to each other, and can be understood as, and final absorption pad subassembly product according to the present invention can not be an axle this or similarly.Therefore, Fig. 2-4 illustrates the absorption pad assembly 44 that similarly has the longitudinal axis 46, and their absorption pad assembly is not this axle.

Absorption pad assembly 44 is similar to above-mentioned absorption pad assembly 30, comprises the absorbent pad material net sheet of three adjacent windings, is designated as 50,52 and 54 respectively.Each absorbent pad material

net sheet

50,52 and 54 all comprises a side, is designated as 50a, 52a and 54a respectively.As shown, each absorbent pad material

net sheet

50,52 and 54 all is wrapped on the longitudinal axis 46, so

side

50a, 52a and 54a have an angle with respect to the longitudinal axis 46 respectively, may be in Fig. 4 clearlyer sees this angle.

Fig. 5 illustrates according to one embodiment of present invention, is wrapped in the absorbent pad material net sheet 60 on axle or the bar 62.Particularly, absorbent pad material net sheet 60 has a width, is defined as " x ", and the girth of axle or bar 62 is defined as " c ".In addition, absorbent pad material net sheet 60 is wrapped in and is a net sheet angle on the axle 62, is defined as " θ ", and axial velocity is defined as " y ", and angular velocity is defined as " ω ".

As shown in Figure 5, absorbent pad material net sheet 60 twines with helical form ideally, comprises many crosspieces, is appointed as

Reference numeral

64,66,67 and 68 respectively.As shown, each crosspiece has an axial distance with the next crosspiece of vicinity, and the interval of this preliminary election is defined as " r ".This crosspiece that distributes along the longitudinal axis that forms can equate that at interval (for example uniform distribution) can not wait (for example, changing with mode selected) yet.

The technical staff in this field can be familiar with and understand by guidance given here, and correct selection and concrete structural parameters by the specific absorption material can obtain concrete required absorbing structure.Structural parameters comprise: the girth of absorbing material netting width, bar, net sheet angle, axial velocity, angular velocity, crosspiece are at interval.

Particularly, be appreciated that absorbent pad material net sheet 60 constitutes one or more absorbing material net sheets that twine simultaneously.Maybe can select in addition, independent absorbing material net sheet or its combination are placed in alignment, and twine with required interval.In addition, specific independent absorbing material net sheet or its combination can be twined with identical or different net sheet angle, axial velocity and angular velocity, thereby form the required absorption product with specific absorbency.Usually, adjacent absorbing material net sheet crossover or width at interval will be determined by girth, net sheet angle, axial velocity and the angular velocity of concrete netting width, axle.

As a reference, described absorption pad assembly more than the present invention, for example, had the absorption pad assembly 30 of axle 40 with axle or bar, and the absorption pad assembly that does not have this axle or bar, for example the absorption pad assembly 44.Therefore, be appreciated that, the present invention can put into practice by various embodiment as required, this bar or axle or play interim processing assosting effect among the embodiment that has as mechanical part, embodiment king-rod that perhaps has or axle are the permanent or building blocks as absorption pad assembly, absorbent item or product, and for example bar or axle are made by the absorbing material that is fit to or other absorption product materials that is fit to.

Fig. 6-the 9th, simplified side view illustrates one section location of optional embodiment according to the present invention different absorbent pad material in different absorption pad assemblies, and the absorption pad assembly is appointed as Reference numeral 70,72,74 and 76 respectively.

Absorption pad assembly 70 shown in Figure 6 links to each other with axle or bar 80, comprises three absorbent pad material net sheets of adjacent winding, is appointed as 82,84 and 86 respectively.In this specific embodiment, single net sheet or

interval

82,84 and 86 chosen as shown net sheets are spaced apart, and as mentioned above, define this and are spaced apart " w ".

Absorption pad assembly 72 shown in Figure 7, three absorbent pad material sheets that comprise adjacent winding, be appointed as 92,94 and 96 respectively, wherein single net sheet or interval 92,94 and 96 near, making does not have at interval by these adjacent absorbing material net sheets (absorption pad assembly 70 as shown in Figure 6) does not have crossover (as described below) yet.

Absorption pad assembly 74 shown in Figure 8 comprises three absorbent pad material net sheets of adjacent winding, is appointed as 102,104 and 106 respectively, and wherein single net sheet or interval are the relations of crossover.Particularly, each independent net sheet or interval 102,104 and 106 and one or more other net sheets or interval overlap.More specifically, net sheet 102 and 106 each with net sheet 104 part of a crossover is arranged, and net sheet 104 and each 102,106 also all comprises the part of crossover.Be appreciated that this crossover can obtain by the whole bag of tricks, for example comprise by changing the mutual alignment of single absorbent pad material net sheet simply, or by increasing the width of specific single absorbent pad material net sheet.

Absorption pad assembly 76 shown in Figure 9 comprises three absorbent pad material net sheets of adjacent winding, is appointed as 112,114 and 116 respectively, and wherein single net sheet or interval also overlap.But in absorption pad assembly 76, it is multiple that crossover is actually, and for example, crossover is to be formed by in three net sheets 112,114 and 116 each.

Figure 10-the 12nd, the local top view that absorbent item is simplified, the shape of similar sanitary towel, concrete optionally preferred embodiment respectively contains or comprises an absorption pad assembly according to the present invention.

Figure 10 illustrates a sanitary towel 120, this sanitary towel is in its side towards medicated clothing, comprise an impermeable bottom of liquid or interlayer 122, comprise in its side and the top layer or the top layer 124 of a fluid permeable also to comprise an absorbent cores 126 of placing and being enclosed between bottom and the top layer towards health.Absorbent cores 126 is the form of absorption pad assembly 128 normally, and as mentioned above, and the absorption pad assembly is positioned at the center of absorbent item 120, between bottom 122 and top layer 124.

The top layer of this absorbent item or top layer are typically designed to the health of contact user, and form the contact surface of each absorbent item.In fact, top layer can be to be made of weaving material or non-woven material that synthetic or natural material form, and is contemplated to be that body fluid is easy to permeate.The material that is fit to comprises the bonded carded fibrous web of polyester, polypropylene, polyethylene, nylon or other heat-bondable fibres.Polyolefin in addition all has good effect as the membranaceous net of perforation and the Web materials of polypropylene and polyethylene polymer, linear low density polyethylene (LLDPE), retrofit.In addition, the top layer that is fit to also can be made of porous thermoplastic film, is non-woven material at the one side or the both sides flank of top layer.This embodiment can make the thigh of user feel more comfortable, and makes the body fluid rapid osmotic.

The bottom of this absorbent item or interlayer normally liquid are impermeable, are designed to towards the inner surface of underwear (not shown) such as crotch.This bottom-layer design is passed absorbent item for allowing air or steam, and stops fluid to pass.Be appreciated that this bottom can be made by any suitable material that provides or have an above-mentioned characteristic.For example, the material of Shi Heing includes thin polymer film such as the polyethylene or the polypropylene of miniature embossing.

Be appreciated that, the top layer of each absorbent item contacts related absorbent cores Face to face with bottom and extends placement together, pass through to use binding agent in the periphery of top layer and bottom, by the heat seal ultrasound wave, but or other suitable being sealed as selecting technology well known to those skilled in the art.

Be appreciated that the absorbent item of similar feminine care such as sanitary towel, typically, when using, can have additional standard relevant or characteristics commonly used with this articles for use position.For example, certain sanitary napkin design is sometimes referred to as " flap " for having flank, and this flap can help to stop fluid to flow out from the both sides of sanitary towel.Another example with these characteristics is to comprise or have a binding agent to the part of coat at round floor.This binding agent of absorbent item is that everybody knows technically, as when sealing state, is covered by a kind of scraps of paper that can open or similar articles before use.Because these features are standard or total, those skilled in the art are known, be not part of the present invention, therefore here be not described in detail.

Figure 11 has shown a sanitary towel 130 that comprises bottom 132, top layer 134 and absorbent cores 136.Absorbent cores 136 comprises an absorption pad assembly 138 that is positioned at the center, is similar to the above.In addition, absorbent cores 136 also comprises other an absorptive unit 139a and a 139b, lays respectively at first and second

lengthwise side

138a and 138b of absorption pad assembly 138.Be appreciated that other

absorptive unit

139a and 139b can be successive, also can be discontinuous, this decides according to concrete application.

Figure 12 illustrates a sanitary towel 140 that comprises bottom 142, top layer 144 and absorbent cores 146.Absorbent cores 146 comprises an absorption pad assembly 148 that is positioned at the center, is similar to the above.In addition, absorbent cores 146 comprises absorptive unit 149, is positioned at the 148a on every side of absorption pad assembly 148.

Figure 13-the 15th, the simplification schematic cross-section of absorbent item such as sanitary towel in the optional embodiment is appointed as Reference numeral 154,156 and 158 respectively according to the present invention.

Figure 13 illustrates a sanitary towel 154 that comprises bottom 162, top layer 164 and absorbent cores 166.Absorbent cores 166 comprises an absorption pad assembly 168 according to the present invention also as mentioned above.More specifically, absorption pad assembly 168 generally includes the absorbent pad material net sheet of many adjacent windings, is appointed as 170,172 and 174 respectively.

As shown, absorption pad assembly 168 does not have axle or bar, and the absorption pad assembly is driven plain along the longitudinal axis, is fit to absorbent item specifically with the shape of using thereby form, and for example becomes feminine care sanitary towel.

Figure 14 illustrates a sanitary towel 156 that is similar to comprising of above-mentioned sanitary towel 150 of corresponding bottom 182, top layer 184 and absorbent cores 186, and absorbent cores 186 comprises an absorption pad assembly 188 according to the present invention also as mentioned above.More specifically, the absorbent pad material net sheet that absorption pad assembly 188 generally includes many adjacent windings or circularizes is appointed as 190,192 and 194 respectively.As mentioned above, wish that this absorption pad assembly can provide an outer surface, this outer surface comprises the material of various concrete selections and can provide improved performance characteristics in specific product is used.

Absorbent cores 186 comprises a structure member, is appointed as Reference numeral 189.This structure member can be positioned at following or top (as shown) adjacent with the absorption pad assembly, or is positioned at the center of absorption pad assembly, reference Figure 15 as described below.In addition, structure member 189 shown in Figure 14 is narrower than the absorption pad assembly 188 that is attached thereto, and unnecessary restriction the present invention like this uses widely, and for example the width of structure member can be used the width that is equal to or greater than relevant absorption pad assembly if desired.

It will be appreciated by those skilled in the art that.The structure member that is fit to when application is of the present invention can be various versions.The material that this structure member is used comprises that everybody knows is applied in fine hair absorbing material in the various absorbent items or other aforesaid absorbing materials.In addition or alternatively, structure member can comprise no absorbefacient material, as do not have absorbefacient elastic component material, as do not have absorbefacient flexible cellular plastic or similar material, this material can strengthen or improve elasticity.

Figure 15 has shown a sanitary towel 158 that is similar to comprising of above-mentioned sanitary towel 154 and 156 of corresponding bottom 202, top layer 204 and absorbent cores 206, absorbent cores 206 is similar to above-mentioned absorbent cores 166 and 186, comprise corresponding absorption pad assembly 208, this structure generally includes the absorbent pad material net sheet of many adjacent windings, is appointed as 210,212 and 214 respectively.

But absorbent cores 206 also comprises a structure member 216, is positioned at the center of adjacent absorption pad assembly 208.If desired, this structure member 216 can be the form of axle or bar, as is used for the form that adjacent absorbent pad material net sheet twines.In addition or alternatively, this structure member can insert simply, place or be positioned in the absorption pad assembly according to the present invention with above-mentioned form, forms above-mentioned form or other forms.

According to the present invention, absorbent cores comprises an absorption pad assembly in the above-mentioned related absorbent item, can be understood as extensive use of the present invention and need not be confined to this.For example, those skilled in the art will appreciate that and to use the absorbent item that comprises two or other a plurality of absorption pad assemblies of selecting for use if desired.In addition, in concrete application, may need this absorbent item to comprise two or more being in and be separated from each other, cover, overlap or the absorption pad assembly of position that other are selected relation.

Therefore, the invention provides can the required absorptive capacity of more complete or more abundant application absorption pad assembly and absorbent item.The present invention also provides the absorption pad assembly and the absorbent item that can adapt to operation as far as possible on a large scale and service condition usually, and under these conditions, this absorption pad assembly can be the same with required form effective and efficient with absorbent item.The making and the production method of this absorption pad assembly and dependent absorption articles for use have been the present invention further provides.

At this disclosed the present invention is described, can under situation, uses, do not specify these at this without any assembly, parts, classification, composition or blending constituent.

Above-mentioned the present invention is the description with respect to certain preferred embodiment, and the needs in order to illustrate, has illustrated many details.Obviously, for a person skilled in the art, the present invention can have additional embodiments, and some details described here can be made a lot of modifications under the situation that does not deviate from ultimate principle of the present invention.

Claims

1. absorption pad assembly with longitudinal axis, this absorption pad assembly comprises:

Have first kind of absorbefacient first kind of absorbent pad material of preliminary election, and

Have second kind of absorbefacient second kind of absorbent pad material of preliminary election, described second kind of preliminary election absorbability is different from first kind of preliminary election absorbability,

Wherein second kind of absorbent pad material setting adjacent one another are of first kind of absorbent pad material of at least a portion and at least a portion, and wherein first kind of absorbent pad material of at least a portion and second kind of absorbent pad material of at least a portion respectively have an edge surface with respect to the angled orientation of the longitudinal axis.

2. absorption pad assembly as claimed in claim 1 is characterized in that, at least a in first kind of absorbent pad material and the second kind of absorbent pad material is successive net sheet form.

3. absorption pad assembly as claimed in claim 1 is characterized in that, first kind of absorbent pad material and second kind of absorbent pad material all are respectively successive net sheet forms.

4. absorption pad assembly as claimed in claim 1 is characterized in that, first kind of absorbent pad material and second kind of absorbent pad material are overlapped relations.

5. absorption pad assembly as claimed in claim 1 is characterized in that, first kind of absorbent pad material and second kind of absorbent pad material are vertically separated.

6. absorption pad assembly as claimed in claim 1 is characterized in that, first kind of absorbent pad material and second kind of absorbent pad material be near relation.

7. absorption pad assembly as claimed in claim 1 is characterized in that, at least a absorbing material that comprises in first kind of absorbent pad material and the second kind of absorbent pad material.

8. absorption pad assembly as claimed in claim 7 is characterized in that this absorbing material comprises the fast Absorption material.

9. absorption pad assembly as claimed in claim 7 is characterized in that this absorbing material comprises superabsorbent materials.

10. absorption pad assembly as claimed in claim 7 is characterized in that this absorbing material comprises a kind of non-woven material, and this material is made up of with the air-flow shaping matrix of multiple different wood pulp cellulose the thermoplastic poly condensating fiber.

11. absorption pad assembly as claimed in claim 7, it is characterized in that, this absorbing material comprises the multiple composition polymerization twisted wire through extruding, this twisted wire comprises and passes first kind and second kind of polymerization composition that multicomponent twisted wire cross section is placed in special area basically that its length along the multicomponent twisted wire is extended continuously.

12. absorption pad assembly as claimed in claim 7 is characterized in that this absorbing material comprises the absorbing foams plastics.

13. absorption pad assembly as claimed in claim 7 is characterized in that, first kind of absorbent pad material comprises absorbing material, and second kind of absorbent pad material comprises the material with the infiltrative obstruction fluid transmission of preliminary election.

14. absorption pad assembly as claimed in claim 13 is characterized in that, the material that hinders the fluid transmission comprises material impermeable.

15. absorption pad assembly as claimed in claim 13 is characterized in that, the material that hinders the fluid transmission comprises the water conservancy diversion material.

16. absorption pad assembly as claimed in claim 13 is characterized in that, the material that hinders the fluid transmission comprises semipermeable materials.

17. an absorbent item that has the longitudinal axis and comprise the absorption pad assembly, the absorption pad assembly forms an external fluid contact surface, comprising:

Have first kind of absorbefacient first kind of absorbent pad material of preliminary election,

Have second kind of absorbefacient second kind of absorbent pad material of preliminary election, this second kind of preliminary election absorbability be different from first kind of preliminary election absorbability and

Have the absorbefacient second kind of absorbent pad material of the third preliminary election, this third preliminary election absorbability is different from second kind of preliminary election absorbability,

Wherein second kind of absorbent pad material setting adjacent one another are of first kind of absorbent pad material of at least a portion and at least a portion, and wherein first kind of absorbent pad material of at least a portion and second kind of absorbent pad material of at least a portion respectively have an edge surface with respect to the angled orientation of the longitudinal axis and

Wherein second kind of absorbent pad material of at least a portion and the setting adjacent one another are of the third absorbent pad material of at least a portion, and with respect to the angled orientation of the longitudinal axis.

18. absorbent item as claimed in claim 17 is characterized in that, first kind, second kind and the third absorbent pad material all are the forms of continuous net sheet.

19. absorbent item as claimed in claim 17 is characterized in that, at least a material with the infiltrative obstruction fluid transmission of preliminary election that comprises in first kind, second kind and the third absorbent pad material.

20. absorbent item as claimed in claim 17 is characterized in that, first kind, second kind and the third absorbent pad material respectively have at least a portion to overlap.

21. absorbent item as claimed in claim 17 also comprises the structure member with the adjacent setting of absorption pad assembly.

22. absorbent item as claimed in claim 21 is characterized in that, this structure member comprises absorbing material.

23. absorbent item as claimed in claim 21 is characterized in that, this structure member comprises no absorbefacient material.

24. absorbent item as claimed in claim 17 also comprises the structure member that is positioned at absorption pad assembly center.

25. absorbent item as claimed in claim 24 is characterized in that, this structure member comprises absorbing material.

26. absorbent item as claimed in claim 21 is characterized in that, this structure member comprises no absorbefacient material.

27. absorbent item as claimed in claim 17 is the form of sanitary towel.

28. make the method for the absorbent item with absorption pad assembly, the absorption pad assembly has the external fluid contact surface, it comprises different absorbefacient separating parts, and the method comprises:

Will at least the first kind and second kind of absorbent pad material be adjacent to spiral type and be wrapped on the rod member, thereby first kind and second kind of absorbent pad material respectively have at least a portion to comprise the outer surface expose portion.

29. method as claimed in claim 28 is characterized in that, first kind of absorbent pad material comprises having first kind of absorbefacient first kind of absorbing material of preliminary election.

30. method as claimed in claim 29 is characterized in that, second kind of absorbent pad material comprises having second kind of absorbefacient second kind of absorbing material of preliminary election, it is characterized in that second kind of preliminary election absorbability is different from first kind of preliminary election absorbability.

31. method as claimed in claim 28 is characterized in that, first kind of absorbent pad material comprises the parts with the infiltrative obstruction fluid transmission of preliminary election.

32. method as claimed in claim 31 is characterized in that, the parts that hinder the fluid transmission comprise material impermeable.

33. method as claimed in claim 31 is characterized in that, the parts that hinder the fluid transmission comprise the water conservancy diversion material.

34. method as claimed in claim 31 is characterized in that, the parts that hinder the fluid transmission comprise semipermeable materials.

35. method as claimed in claim 28 is characterized in that, axle forms the ingredient of absorbent item to small part.

36. method as claimed in claim 28 is characterized in that, first kind and second kind of adjacent absorption mesh sheet material have the overlapping of pre-selected amount.

37. method as claimed in claim 28 is characterized in that, first kind and second kind of adjacent absorbent pad material have the interval of preliminary election between adjacent spiral type crosspiece.

38. method as claimed in claim 28, comprise also that spiral type twines at least with second kind of the third absorbent pad material that absorbent pad material is adjacent.

39. method as claimed in claim 28 also comprises making the adjacent setting with the absorption pad assembly of absorbent core structures parts.

40. method as claimed in claim 39 is characterized in that, the absorbent core structures parts be placed on the absorption pad assembly below.

41. method as claimed in claim 39 is characterized in that, the absorbent core structures parts be placed on the absorption pad assembly above.

42. method as claimed in claim 39 is characterized in that, the absorbent core structures parts are placed on the center of contiguous absorption pad assembly.

43. method as claimed in claim 39 is characterized in that, the absorbent core structures parts comprise having the absorbefacient absorbing material of preliminary election.

44. method as claimed in claim 39 is characterized in that, the absorbent core structures parts comprise no absorbefacient material.

45. method as claimed in claim 39 is characterized in that, the absorbent core structures parts comprise no absorbefacient elastic component material.

46. method as claimed in claim 28 is characterized in that, the absorption pad assembly has the longitudinal axis, and the method also comprises the step that flattens the absorption pad assembly along its longitudinal axis.

47. method as claimed in claim 28 is characterized in that, absorbent item comprises at least the first kind and second kind of absorption pad assembly.

48. method as claimed in claim 47 is characterized in that, first kind and second kind of absorption pad assembly are spaced relationship.

49. method as claimed in claim 47 is characterized in that, first kind and second kind of absorption pad assembly are eclipsed relations.

50. method as claimed in claim 47 is characterized in that, first kind and second kind of absorption pad assembly are partly overlapping relations.

51. make the method for the absorbent item with absorption pad assembly, the absorption pad assembly has the longitudinal axis and external fluid contact surface, this surface comprises different absorbefacient separating parts, and this method comprises:

Be adjacent to spiral type to first kind of major general, second kind and the third absorbent pad material and be wrapped on the rod member, thereby first kind, second kind and the third absorbent pad material respectively there are at least a portion to comprise the outer surface expose portion;

Flatten this absorption pad assembly along its longitudinal axis;

The absorbent cores that will comprise the absorption pad assembly of pressing is placed between bottom and the top layer.

52. method as claimed in claim 51 is characterized in that, absorbent item is the form of sanitary towel.