CN1095644C - Thermoplastic fibrous nonwoven webs for use as core wraps in absorbent articles - Google Patents
Thermoplastic fibrous nonwoven webs for use as core wraps in absorbent articles Download PDFInfo
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- CN1095644C CN1095644C CN95197950A CN95197950A CN1095644C CN 1095644 C CN1095644 C CN 1095644C CN 95197950 A CN95197950 A CN 95197950A CN 95197950 A CN95197950 A CN 95197950A CN 1095644 C CN1095644 C CN 1095644C
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Abstract
The present invention relates to a moisture absorption article with a moisture absorption core coated by tulle paper. The tulle paper is manufactured by a thermoplastic non-woven fiber net especially designed; the net is especially suitable for collecting and packing granular substances, such as super moisture absorption material granules. The present invention is mainly applied to individual care products, such as napkins, training trousers, underpants for incontinence people, sanitary towels, bandages, etc.
Description
Technical field
The present invention relates to a kind of absorbent product that is used for personal nursing, and make this method by the absorbent article core that melts and sprays the tissue paper parcel with the absorbent article core that wraps up by tissue paper.Described tissue paper outer housing is made by thermoplastic fibres.
Background technology
The personal nursing absorbent product in the present age has experienced large-scale change.The personal nursing absorbent product comprises that diaper, training pants, incontinent person use underwear, sanitary towel, binder etc.These products, particularly diaper, training pants, incontinent person are to increase wettability power when reducing product size with the main direction of the design of underwear and sanitary towel always.Use the superabsorbent material to make above-mentioned improvement become possibility more and more.
With the diaper is example, and early stage diaper designs very thickly, and this is because the absorbent article core that adopts very big fine hair of volume or wood pulps to make diaper.The result makes the diaper volume very big and be easy to leak, and this is that fluff structures is tending towards caving in because after the tomentum urine of moisture absorption is soaked.The fine hair that is used for this personal nursing absorbent product generally has every gram fine hair and absorbs the liquid, aqueous wettability power of 4 to 20 grams.In addition, described wettability power depends on the size that acts on the pressure on the wet fine hair.For example, under the pressure of 3.45 kPas (0.5 pounds/square inch), every gram fine hair only can keep the wettability power of approximate 7 grams.Under 0.69 kPa of (0.1 pound/square inch) situation, its wettability power increases to every gram fine hair and absorbs liquid 12 gram approximately, and is under 0 the situation at pressure, and the wettability power of fine hair is that every gram fine hair absorbs about 20 grams of liquid.
Along with appearance and their application in absorbent article core of superabsorbent material, the size of absorbent article core is reduced.Initial superabsorbent material has the wettability power that every gram absorbs 50 gram liquid, but after they were soaked, these granules became pasty state, and often make glued piece.Now, even the superabsorbent material still has very high wettability power under stress state, but the wettability power of many superabsorbent materials is reduced to about every gram moisture absorption 35 grams.In the first kind of commodity diaper that adopts the superabsorbent material, adopt the weight of superabsorbent material to account for 10% to 20% of absorbent article core gross weight.General diameter is that 20 to 1000 microns superabsorbent granule and wood pulps fibre machinery becomes entangled in the absorbent article core.In addition, contain the carpet veneer of superabsorbent material with thin paper parcel sometimes, and make thin paper self with glue sometimes and/or stick together, so that further seal and preserve fine hair and superabsorbent material with fine hair.
Now, personal nursing absorbent product such as diaper etc. are by reducing thickness widely in adopting the more and more higher superabsorbent granule of percentage ratio to substitute a large amount of fine hair in absorbent device.The superabsorbent material is higher than 40% in the absorbent article core of some diaper now.After having increased the tissue paper outer housing, in order to reduce absorbent article core thickness further, often will be with its compacting.Consequently, easily cave in after old-fashioned fine hair absorbent article core soaks, and the new-type absorbent article core with superabsorbent material can expand after soaking.This expansion is accompanied by reversing and bending of absorbent article core in use, and this may cause the thin paper outer housing to break and tear, and more may occur soaking this situation in back especially.After above-mentioned situation takes place, the superabsorbent material will overflow from diaper probably.Although what danger this does not have, say so undesirable from the performance of entire product.
When the ratio of hygroscopic material employing increases, under drying regime, also exist the possibility that the superabsorbent material is overflowed and from absorbent article core.When the fine hair in the absorbent article core reduced, the machinery of fiber twined also and reduces thereupon.Like this, in case the thin paper outer housing breaks or with glue sealing seam part separately, the probability that some superabsorbent materials effusions are come increases.A bigger problem is that the hole of many thin paper outer housings is too big, thereby makes the superabsorbent material can overflow.Therefore, be necessary to adopt more efficient methods to seal absorbent article core.
It seems from the viewpoint of making and to have some problems.Stick with glue connect the thin paper outer housing be the difficulty and can increase cost.Shake off the superabsorbent granule and also can draw the problem of equipment and back work, and the waste of material can increase the cost of new product.Therefore, be necessary in the personal nursing absorbent product, to adopt a kind of follow-on absorbent article core/outer housing.
Summary of the invention
The present invention relates to a kind of absorbent device of being made the absorbent article core of outer housing by tissue paper that has, this tissue paper is made by thermoplastic fibres, and this absorbent device is used for the personal nursing absorbent product, and for example diaper, training pants, incontinent person use underwear, sanitary towel, binder etc.The absorbent article core outer housing is made by the fibrous nonwoven webs thing that comprises a large amount of thermoplastic fibres.Many mean flow pore size are arranged less than about 30 microns micropore on the absorbent article core outer housing, and wherein the aperture of the micropore below 5% greater than 50 microns.Absorbent article core covers on outward under the peak load, and hygrometric state on machine direction or cross machine and dry state tensile strength ratio are 0.5 or bigger.In addition, the Frazier air permeability of absorbent article core outer housing is at least 61 cubic metres every square metre of per minutes (200 cubic feet every square feet of per minutes), on machine direction, percentage elongation under the peak load is 30% or littler, on cross machine, the percentage elongation under the peak load is 40% or littler.Non-woven fibre absorbent article core outer housing is used for sealing the absorbent article core that contains graininess superabsorbent material.The architectural characteristic of absorbent article core outer housing makes graininess superabsorbent material have the sand trail value less than 60 milligrams.In addition, if desired, absorbent article core can comprise many can with the fiber of fibrous nonwoven webs absorbent article core outer housing heat bonding.In order to preserve graininess superabsorbent material effectively, be necessary to make in a large amount of fibers that constitute the absorbent article core outer housing at least 85% fibre diameter to be less than or equal to 8 microns, and preferably have at least the fibre diameter of 95% this fiber to be less than or equal to 7 microns.Adopting under the thin especially particulate situation of superabsorbent, be necessary the quantity of the aperture in the fibrous nonwoven webs thing greater than 50 microns hole is strict controlled in below 1%.Absorbent article core outer housing of the present invention is made by the melt-blown nonwoven fiber net.From the selective polymer angle, have been found that to use polyolefine fiber and special polypropylene base polymer effect fine.
Have fibrous nonwoven webs absorbent article core outer housing and can be used as the final products use, or be applied among the personal care product with absorbent device itself with absorbent article core of graininess superabsorbent material.This personal care product generally comprises a top flat and egative film and certain hygroscopic material between top flat and egative film.According to the present invention, hygroscopic material is above-mentioned absorbent device.
The technology of making absorbent device according to the present invention comprises that the thermoplastic polymer's extrusion molding with fusing is the liquid stream of multi beam fusing.The liquid stream of these molten states is become many fibers by drawing-down then, these fiber laydown form the fibrous nonwoven webs absorbent article core outer housing with many micropores to profiled surface, the mean flow pore size of this micropore is less than about 30 microns, and be no more than 5% micropore size in these micropores greater than 50 microns, the fibrous nonwoven webs absorbent article core covers under the peak load outward simultaneously, hygrometric state on machine direction or cross machine and dry state tensile strength ratio are 0.5 or bigger, and its Frazier air permeability is at least 61 cubic metres every square metre of per minutes (200 cubic feet every square feet of per minutes).Fibrous nonwoven webs absorbent article core outer housing deposits a large amount of graininess superabsorbent materials thereon after being shaped, and then the absorbent article core outer housing is sealed to encapsulate described graininess superabsorbent material.In addition, if desired, can before the sealing step, many water absorbent fibers be deposited on the absorbent article core outer housing.
Description of drawings
Fig. 1 is the perspective view of absorbent device of the present invention;
Fig. 2 is the cutaway view of absorbent device of the present invention;
Fig. 3 is the cutaway view of the another kind of absorbent device of the present invention;
Fig. 4 is the cutaway view of another absorbent device of the present invention;
Fig. 5 makes the process flow diagram of absorbent device for the present invention;
Fig. 6 is the top plan view of partly cut-away that comprises the personal nursing absorbent product of absorbent device of the present invention;
Fig. 7 is the perspective view of sand trail device;
Fig. 8 is a partly cut-away, is used for sand trail, representational specimen slides and by the top plan view of test agent.
Fig. 9 is a specimen slides shown in Figure 8 and by the side view of test agent.
The specific embodiment
Referring to Fig. 1 to 4, the present invention relates to a kind of absorbent device 10 that comprises an absorbent article core 12 and an absorbent article core outer housing 14.Absorbent article core outer housing 14 is particularly suitable for packing absorbent article core, and this absorbent article core mainly or all is to be made by granular material, for example the superabsorbent material granule.Yet be to be understood that, the present invention is not limited to adopt the superabsorbent material granule, can also be any granular material, for example odor adsorption and ion-exchange resin particles and controllably release additives increase the material that material, softening agent and spice etc. need preservation as moisture.
" superabsorbent or superabsorbent material " refers to that water is swollen, the material of water miscible organic or inorganic, can absorb the liquid of at least 20 times of own wts under optimal condition, the concentration that preferably can absorb 30 times of own wts is 0.9% sodium chloride aqueous solution.The organic material that is suitable for use as the superabsorbent material among the present invention comprises natural material, as agar, pectin, guar gum and analog; Also comprise synthetic material simultaneously, as the synthetic water gelatin polymer.This aquogel polymer, for example, the polymer and copolymer, polyacrylate, polyacrylamide, polyvinylpyridine or the analog that comprise polyacrylic alkali metal salt, polyacrylamide, polyvinyl alcohol, vinyl maleic anhydride copolymers, polyvinylether, methylcellulose, carboxymethyl cellulose, hydroxypropyl cellulose, polyvinyl ethers and vinyl sulfonic acid.Other suitable polymers comprise hydrolysis acryionitrile grafted starch, acrylic acid grafted starch and isobutene. maleic anhydride polymer and their mixture.Aquogel polymer is preferably loose crosslinked, thereby it is water insoluble basically that this material is become.Crosslinked can the realization by radiation or covalency, ionic, Van der Waals key or hydrogen bond.Can adopt the superabsorbent material of Any shape in the hygroscopic mixture, comprise analogous shapes such as granule, fiber, flakelike powder, spheroid.The general suitable particle size range of this superabsorbent material is about 20 to about 1000 microns.The percentage by weight of contained superabsorbent material can be 0% to 100% of an absorbent article core gross weight in the absorbent article core 12.
The absorbent article core 12 that is used for the personal nursing absorbent product generally will comprise the superabsorbent granule and alternatively comprise additional hygroscopic material, as water absorbent fiber, include but not limited to wood pulps villus fiber, synthetic wood pulps fiber, synthetic fibers and the aforementioned mixtures of material of mentioning.Wood pulps fine hair is as by being positioned at Neenah, and the CR-54 wood pulps fine hair that the Kimberly-Clark company of Wisconsin provides is effectively moisture absorption additive.But a common issue with of wood pulps fine hair is that it lacks integrity and is tending towards caving in when it is soaked.Like this, interpolation has inflexible reinforcing fibre in absorbent article core 12, and for example the U-shaped fiber of polyolefin meltblown fibers or short length is of great use.Be called " forming altogether " during being mixed with of this fiber.Make meltblown fibers and be known the processing of meltblown fibers and superabsorbent material and/or wood pulps fiber mixing.Melt and spray net and can obtain by what fiber constituted: the thermoplastic material under the molten state is pressed through pore a plurality of precisions, that be generally circular perforation by following method, thereby form fusing line or silk and contact with the high speed thermal current, this air flow makes the thermoplastic silk drawing-down of fusing to reduce diameter.Then, meltblown fibers is carried and is deposited to by the heated at high speed air-flow and collects the surface upward to form the netted thing of meltblown fibers of random distribution.Melt-blown process is known, and is described by various patent documentations and publication, comprises V.A.Wendt, the NRL report 4364 of E.L.Boone and C.D.Fluharty, " manufacture method of hyperfine organic fiber "; K.D.Lawrence, the NRL report 5265 of R.T.Lukas and J.A.Young, " improving equipment of hyperfine thermoplastic fibres shaping "; And on November 19th, 1974 authorize people's such as Buntin United States Patent (USP) 3,849,241.In order to form " forming altogether " material, the component of interpolation is mixed with meltblown fibers.For example, superabsorbent material granule and/or U-shaped fiber as the wood pulps fiber, can be ejected in the meltblown fibers stream so that be trapped and/or bond on the meltblown fibers.For example, can be referring to people's such as Anderson United States Patent (USP) 4,100,324; People's such as Hotchkiss United States Patent (USP) 4,587,154; People's such as McFarland United States Patent (USP) 4,604,313; 4,655,757 and 4,724,114 and people's such as Minto British patent GB2,151,272, the full content of above-mentioned all patents is hereby incorporated by.
Absorbent article core outer housing of the present invention is specifically designed to by the fibrous nonwoven webs thing to be made, and this net is made of the very little thermoplastic fibres of diameter, and has special pore size and breathability.So-called thermoplastic fibres refers to this fiber and is made of polymer, and this fiber can self be bonding under heating or heating pressurized conditions like this.The melt-blown nonwoven fiber net is not limited to specific processing method, and result of use is fine.From the selective polymer angle, have been found that to use polyolefine fiber and special polypropylene base polymer effect fine.The general processing of this melt-blown nonwoven fiber net is known, as sees the above-mentioned relevant patent of mentioning that melts and sprays.Fiber can be hydrophilic or hydrophobic, although wish that final net/absorbent article core outer housing is hydrophilic.Fiber finally can become hydrophilic by adopting surface treatment.
In order to play the absorbent article core outer housing well, melt and spray net and should have some special performances.A common problem of thin paper outer housing is its insufficient strength under the state of soaking.Generally no matter in machine direction (MD) or on cross machine (CD), the hygrometric state dry strength of thin paper outer housing is put it briefly than the value that records with test method and is lower than 0.5.Otherwise the hygrometric state dry strength ratio of absorbent article core outer housing 14 of the present invention is higher than 0.5, is 1.0 or higher sometimes.The mean flow pore size that records in following test is about 30 microns or littler in addition, and simultaneously, it is 50 microns or bigger that the micro-pore diameter less than 5% is only arranged under any given area.It is 50 microns or bigger that micro-pore diameter less than 1% is only arranged under preferably any given area.In order to reach above-mentioned measurement index, wish that it is 8 microns or littler that absorbent article core outer housing 14 has the fibre diameter of 85% fiber at least, preferably having the fibre diameter of 95% fiber at least is 7 microns or littler.Like this, absorbent article core outer housing 14 will have the Frazier air permeability of 61 cubic metres every square metre of per minutes (200 cubic feet every square feet of per minutes) or bigger.In case absorbent article core 12 is wrapped up by absorbent article core outer housing 14, outer housing 14 just can not overextension or stretching, otherwise can cause micropore to become big and excessive particulate matter is run out.Therefore, the absorbent article core outer housing can correspondingly have on machine direction and cross machine and is less than or equal to 30% and be less than or equal to 40% stretch value generally under drying regime, peak load.
In order to make absorbent device of the present invention, the reference view of the processing technology that provides with reference to figure 5.Must be device for melt blowing at this at first, form absorbent article core outer housing 14 with fibre forming device 50.As shown in Figure 5, melt and spray tissue paper and cover on the production line outward and be shaped, melt and spray the tissue paper outer housing, by deflector roll it is sent in the technology shown in Figure 5 then but also can outside production line, form.Referring to Fig. 5, the thermoplastic polymer such as the polyolefin of fusing are heated again, make it then to push out from the die orifice tip to form multi beam polymer melted liquid stream.Leave the die orifice tip of device for melt blowing 50 along with polymer liquid stream, they are by the high-speed air drawing-down, this high-speed air makes the fusing liquid stream be drawn into many fibers 52, and fiber 52 deposits on the profiled surface 54 and forms the net that twines at random, thereby constitutes absorbent article core outer housing 14.For the formation of further quickening net and in order to help better on profiled surface 54 fixedly net, can be below foraminous profiled surface 54 employing vacuum equipment 56.
In case absorbent article core outer housing 14 forms on profiled surface or launches from a pre-fixed roll (not shown), next should form absorbent article core 12 or make the surface deposition of absorbent article core at absorbent article core outer housing 14.As shown in Figure 5, there are the feeding device 58 of a superabsorbent material or other type of particle 60 and one can select the water absorbent fiber 64 that uses, for example feeding device 62 of wood pulps fiber or meltblown fibers.If adopt water absorbent fiber 64 and superabsorbent granule 60 to form absorbent article core 12, both mixed earlier before depositing on the absorbent article core outer housing 14 mutually can to make them as shown in Figure 5, or made their layerings, thereby made granule in absorbent article core 12 internal insulation.Equally, in order to promote deposition further and to keep the absorbent article core material, can adopt same vacuum equipment 56 or independent vacuum equipment if desired on the surface of absorbent article core outer housing 14.
After absorbent article core 12 has deposited on the absorbent article core outer housing 14, next absorbent article core outer housing 14 should be sealed along absorbent article core 12, thereby absorbent device 10 is sealed and formed to absorbent article core 12.Shown in Fig. 1 to 4, in order to seal absorbent article core, absorbent article core outer housing 14 should wrap up absorbent article core 12 and seal fully, is preferably self seal.Equally also need end limit sealing with absorbent device.Because the thermoplastic property of absorbent article core outer housing 14 fibers can make absorbent article core outer housing 14 heating back self seals, so just no longer needs glue, although also can adopt glue as required.In addition as required, can make absorbent article core material 60 and 64 cycle alternation feed, hold the sealing on limit between each sedimentary deposit of hygroscopic material, to form like this.Furtherly, if water absorbent fiber 64 also has thermoplasticity, hold the sealing of limit and side to form sealing so by the absorbent article core outer housing 14 that bonds to effectively on the whole absorbent article core.
Shown in accompanying drawing 2 and 3, if absorbent article core outer housing 14 is enough loose, then it can self fold, and for example uses the method for bonding agent, heating and/or pressurization then, in top or the bottom (see figure 2) or the sealing of side (see figure 3) of absorbent device 10.Self folding of absorbent article core outer housing 14 can be passed through to adopt conventional sheet stock folding device 66, as absorbent article core outer housing 14 bending dish of processed on himself is realized.As an alternative, an independent sheet stock absorbent article core outer housing 14 ' can be launched or produce, thereby absorbent article core 12 is encapsulated between ground floor absorbent article core outer housing 14 and the second layer absorbent article core outer housing 14 ' by one second feed source 68.Referring to Fig. 4.The same with Fig. 2 and embodiment shown in Figure 3, can adopt a sealing device 70, as ultrasonic bonding or other hot mechanical welder or by adopting bonding agent, the loose edge of absorbent article core outer housing is sealed.
But all this personal nursing absorbent products generally comprise top flat 20 and a general liquid-tight egative film 22 of a transflective liquid.Between top flat 20 and egative film 22 a kind of hygroscopic material being arranged, is absorbent device 10 in this application.If desired, can be between top flat 20 and the egative film along corresponding peripheral 24 sealings, thereby with absorbent device 10 parcel wherein.
Product of the present invention and the technology of making product of the present invention are described above, in addition, have also prepared a series of examples in order to further specify the present invention.The test procedure of these examples and measuring samples will be described below.Test procedure Coulter pore instrument mean flow pore size and pore-size distribution test
Employing is positioned at Luton, and the Coulter115/60 pore instrument of the Coulter electronics, inc. of England is measured mean flow pore size, maximum stream flow aperture and pore-size distribution.This installs measurable maximum diameter of hole is 300 microns.Adopt bubbling point and mean flow pore size method of testing, the ASTM standard test method regulation F31686 according to the membrane filter aperture response measures mean flow pore size, maximum stream flow aperture and pore-size distribution.The Frazier air permeability
Be used to measure the step of Frazier air permeability according to method 5450, the detailed description that is federal test method standard No.191A is carried out, except adopting sample size is 20.3 centimetres (8 inches) * 20.3 centimetres (8 inches), and does not adopt outside 17.8 centimetres (7 inches) * 17.8 centimetres (7 inches).The sample of large-size can guarantee that its all limits can be stretched over outside the retaining ring well, and the hole that helps clamping sample securely and stride across this retaining ring reposefully.Measured value is to be every square feet of cubic feet (ft of per minute with the unit
3/ ft
2/ min) provide, in order to convert thereof into the value of every square metre of cubic meter unit of per minute, should multiply by 0.305.Tensile strength (hygrometric state and dry state) and percentage elongation
The standard testing method (peeling force) of employing ASTM step D5 035-90-fabric crushing force and percentage elongation is measured hygrometric state and the dry state tensile strength under the peak load.Constant percentage elongation (constant-rate-of-extension) the type assay device SinTech model S2 that adopts in this step is by being positioned at Carey, and the SinTech company of North Carolina makes.In this step, adopt 7.5 centimetres (3 inches) long cutting strip sample, rather than adopt 2.5 centimetres (1 inch) or 5 centimetres (2 inches) long sample of in step D5035-90, stipulating.Fibre diameter
For with electronic scanner microscope (SEM), as Deerfield, Cambridge Stereoscan 200 microscopic examination of the Leica company of Illinois are in advance with sputter oil gidling on the fiber of nonwoven web matter sample.100 fibers of picked at random are also measured the diameter of every fiber with the electron cursor of SEM.Pay special attention to not choose the fiber that is melted in together.The preparation of vibrating bin vibrating shakeout test procedure sample
Referring to Fig. 8 and 9, the cellulose paper of 350gsm (or can make specimen slides 80 be inserted into enough bending resistance in test unit flexible equivalent material that suitable structural integrity be provided to have) is cut into the specimen slides 80 that 10.2 centimetres (4 inches) take advantage of 27.9 centimetres (11 inches).
One 0.635 centimetre (0.25 inch) is wide, there is the adhesive tape 82 of pressure adhesive on both sides,, high viscosity bonding agent thick as 3M Scotch board 2mil transmits the central authorities that adhesive tape (#465) or equivalent are put into specimen slides, is that 10.2 centimetres (4 inches) take advantage of the rectangle " window frame " of 10.2 centimetres (4 inches) to constitute the periphery length of side.
The superabsorbent material 84 of 500 milligrams (± 5 milligrams) is put into the central authorities of " window frame ".The particle size distribution of superabsorbent material is measured by the mesh analysis of routine, and the result is as follows:
212-300 micron: 40% (weight ratio)
149-212 micron: 35%
90-149 micron: 35%
Test is finished with a monolayer absorbent article core outer housing 14 samples, takes advantage of the tested sample strip of 11.4 centimetres (4.5 inches) to be placed on the frame zone with one 11.4 centimetres (4.5 inches), and to the sample pressurization, makes it to adhere on the bonding agent adhesive tape, so that form a firm sealing.The vibrating shakeout test unit
Referring to Fig. 7, adopt a knockout machine 90, for example can measure the ability that the absorbent article core outer housing is sealed the superabsorbent material from the type variable primary track vibratory shakeout machine (Variable Junior Orbit Shaker) (Model 3520) that Lab-Line obtains.Also can adopt the vibratory shakeout machine of equivalence in addition.
One proof box 92 can be fixed on the vibratory shakeout machine.Case 92 has four sidewalls and a diapire that is used, and these walls can form with various suitable material structures, and for example thickness is about the transparent polycarbonate sheet of 0.0635 centimetre (0.025 inch).Case is about 29.2 centimetres (11.5 inches) along the measurement size on the length 94, be about 33 centimetres (13 inches) along the size on the width 96, be about 12.7 centimetres (5 inches) along the size on the degree of depth 98, and be divided into three parts 100, each part is enough big, so that provide the space for hygroscopic material wherein.Therefore, the internal measurement size of part is about 10.2 centimetres (4 inches) and takes advantage of 29.2 centimetres (11.5 inches) shown in each.Each part also is equipped with two conventional collets 104 on the opposite end walls that is arranged on this part, and the structure of collet is convenient to make securely specimen slides to remain on its position.A jaw of each alligator clamp is securely fixed on the end wall of appropriate section, and another jaw is arranged to freely to respond the pressure that affacts on its attached incentive lever 106 and is opened and closed.In test, the two ends that specimen slides is relative are held on a pair of chuck that is connected on the specific part that is used for testing securely.Specimen slides is positioned at and makes on the position of absorbent article core outer housing sample near the case diapire.Vibration on Start-up shakeout and with the speed operation that is predefined for 350rpm 5 minutes.The collection of superabsorbent material
Measure the quantity of the superabsorbent material that from absorbent article core outer housing sample, shakes out with a vacuum collecting sand shake-out device using.As example 5 to 8, the air monitering box (No. 4338, Gelman science product) that to prepare a diameter be 37mm is put the cellulose supporting pad (production number 64747) of a 37mm in the bottom of box.Put one 0.08 millimeter Metricel at the top of supporting pad
Thin film (production number 64678), and the top of box is pressed into the bottom that matches.The box for preparing is weighed and write down or mark weight.Box is hung on the suitable vacuum equipment with pipe.Plastic funnel of peace on pipe, the superabsorbent material is sucked in the monitor box.Again this box of weighing, and measure the quantity of superabsorbent material by the calculated weight difference.This test is used for example 5 to 8, and the value that provides in the claim promptly obtains in this way.The test of bag vibrating shakeout
Second kind of test method also is used for measuring the granule that shakes out from the absorbent article core outer housing, example 1 to 4 and 9 promptly adopts this test.The absorbent article core outer housing is cut into 20.3 centimetres (8 inches) takes advantage of the sample of 10.2 centimetres (4 inches) to test.Next the Dow 534 graininess superabsorbent materials that 0.5 gram is obtained from the Dow chemical company are placed on the top of sample, again sample self is folded up and covered the superabsorbent material, constitute the bag that 10.2 centimetres (4 inches) take advantage of 10.2 centimetres (4 inches).The particle size range of superabsorbent material is 88 to 149 microns.Four limits and a slice plastic sheeting with bag is bonded together then.Bonding region is approximately 0.635 centimetre (0.25 inch) with the peripheral overlapping of bag.Next with sample and thin film upset (under the bag side direction), mixture is placed on from the RX-24 type vibratory shakeout machine of Tyler company acquisition.Place a weighing pan below sample, the size of this dish is enough to collect any superabsorbent material that shakes out.The Vibration on Start-up shakeout makes its operation 5 minutes.Vibratory shakeout machine is with the frequency operation in 520 weeks of per minute, and each run is 1.27 centimetres (0.5 inches).Close vibratory shakeout machine, this dish of weighing again after 5 minutes.Weight after the collection is promptly represented the quantity of shaking out with the difference of dish tare weight.Example example 1
With from U.S. Wilmington, the Himont PF-015 polyacrylic polymer that the Himont place of Delaware is buied is made a polypropylene melt-blown fibrous nonwoven webs absorbent article core outer housing.Melt and spray the absorbent article core outer housing and can adopt of the meltblowing method preparation of two groups of device for melt blowing by the aforementioned operation explanation.Polypropylene melts and sprays the draw modul extruding from two groups and comes out, its by speed for per hour restraining (per hour per inch is 2.5 pounds) (PIH) for every centimetre 0.44 thousand.The melt polymer of extruding is 530 °F by temperature, transports the initial drawing-down air drawing-down of speed between 48.2 to 56.8 cubic metres of per minutes (1700 to 2000 cubic feet of per minutes).The final basic weight that melts and sprays the absorbent article core outer housing is every square metre 8.0 gram (gsm), and use from Union Carbide chemistry and plastic company and be positioned at Danbury, the Triton X-102 surfactant that the industrial chemistry goods branch company place of Connecticut is buied, promptly hot phenoxy group polyethoxy ethanol non-ionic surface activator is handled.
Under peak load, the tensile strength on machine direction (MD) and cross machine (CD) is respectively 1010 grams and 514 grams during absorbent article core outer housing dry state, and machine direction and the percentage elongation on the cross machine under peak load are respectively 16% and 33%.During hygrometric state, the tensile strength on machine direction under peak load (MD) and the cross machine (CD) is respectively 998 grams and 554 grams.The tensile strength of hygrometric state and dry state is respectively 0.99 and 1.08 than on machine direction and cross machine.Ratio is divided by for corresponding MD direction and the hygrometric state on the CD direction and the value under the dry state.The mean flow pore size of sample is 25 microns, and the maximum stream flow aperture is 47 microns, its aperture, hole of 0.5% is wherein arranged greater than 50 microns.The Frazier air permeability of absorbent article core outer housing is 110.1 cubic metres every square metre of per minutes (361 cubic feet every square feet of a per minute).The sample that melts and sprays the absorbent article core outer housing is made into a bag then, be equipped with from Midland in the bag, Dow 534 shape superabsorbent materials 0.5 gram that the Dow chemical company place of Michigan is buied, the particle size diameter scope of this superabsorbent material is between 88 to 150 microns.Bag must be through summarizing above bag vibrating shakeout test procedure, recording the vibrating shakeout test value is 2.7 milligrams, and when same superabsorbent material be put into make by standard thin paper moisture absorption outer cover material bag in the time, its vibrating shakeout test value is 395 milligrams.Example 2
In example 2, make polypropylene melt-blown fibrous nonwoven webs absorbent article core outer housing, and the processing of surfactant is identical with above-mentioned example 1 with same polymer.Adopt three groups to melt and spray drawing-die when making melts and sprays net, transport polymer with per hour 0.62 kilogram every centimetre (per hour per inch is 3.5 pounds) speed (PIH), initial drawing-down air mass flow is still identical with example 1.The basic weight of final net is every square metre 11.0 gram.Machine direction tensile strength during the dry state of absorbent article core outer housing under peak load is 1391 grams.Mean flow pore size is 23 microns, and the maximum stream flow aperture is that 40 microns and 0% micropore are greater than 50 microns.The Frazier air permeability that records is 76.3 cubic metres every square metre of per minutes (250 cubic feet every square feet of a per minute).Described in example 1, melt and spray the absorbent article core outer housing and be made to a bag then, same Dow 534 type superabsorbent materials 0.5 gram is housed in bag.This bag stands the vibrating shakeout test then, and the vibrating shakeout test value that records is 5.0 milligrams.Example 3
In example 3, use the polymer identical to make the polypropylene melt-blown absorbent article core outer housing that basic weight is every square metre 8.0 gram with previous example.Machine direction tensile strength during absorbent article core outer housing dry state under peak load is 914 grams, and mean flow pore size is 24 microns, and the maximum stream flow aperture is 40 microns, is 0% greater than 50 microns micropore simultaneously.The Frazier air permeability is 99.7 cubic metres every square metre of per minutes (327 cubic feet every square feet of a per minute), and the vibrating shakeout test value that records the absorbent article core outer housing with the test of bag vibrating shakeout is 1.1.Example 4
Adopt same Himont polyacrylic polymer to make in example 4 and melt and spray the absorbent article core outer housing, its basic weight is every square metre 8.8 gram.The fiber diameter of absorbent article core outer housing is 2.4 microns, and machine direction during dry state under peak load and the tensile strength on the cross machine are respectively 844 and 382 grams, and the percentage elongation on machine direction and the cross machine is respectively 15% and 11%.Mean flow pore size is 22 microns, and the maximum stream flow aperture is 34 microns.The Frazier air permeability is 147.6 cubic metres every square metre of per minutes (484 cubic feet every square feet of a per minute), and the bag vibrating shakeout test value of superabsorbent material is 0.4 milligram.Example 5
In example 5, make and melt and spray the absorbent article core outer housing with same Himont polyacrylic polymer.Process conditions comprise by speed for per hour every centimetre 0.27 thousand the gram (per hour per inch is 1.5 pounds), used drawing-down air turnover rate is 16.46 cubic metres of per minutes (580 cubic feet of per minutes) under 490 temperature.The shaping distance that melts and sprays between drawing-die tip and the profiled surface is 24.1 centimetres (9.5 inches), and the travelling speed that deposits the shaping silk of net above is 62.2 meters of per minutes (204 feet).The basic weight of sample is every square metre 7.2 gram, and fiber diameter is 2.6 microns, and the fibre diameter of 97% fiber is less than 7 microns.Tensile strength on machine direction when hygrometric state and dry state under the peak load is respectively 556 grams and 584 grams, and the tensile strength on the cross machine when hygrometric state and dry state under the peak load is respectively 251 grams and 231 grams.Like this, hygrometric state on machine direction and cross machine and dry state tensile strength ratio are respectively 0.95 and 1.09.Machine direction and the percentage elongation on the cross machine that absorbent article core covers on outward under the peak load are respectively 6% and 10%.The Frazier air permeability that records is 150 cubic metres every square metre of per minutes (492 cubic feet every square feet of a per minute).Adopt above-mentioned Coulter pore instrument pore size test, recording the mean flow pore size that melts and sprays the absorbent article core outer housing is 26 microns.The aperture greater than 50 microns micropore less than 5%.Adopt above-mentioned vibrating shakeout case vibrating shakeout test, the superabsorbent material vibrating sand trail value that obtains sample is 2.0 milligrams.The used suitable diaper tissue paper sample of Kimberly-Clark company under peak load machine direction and the hygrometric state on the cross machine and dry state tensile strength than on both direction, all being significantly smaller than 0.5.The Frazier air permeability of this thin paper outer housing that records is 144.3 cubic metres every square metre of per minutes (473 cubic feet every square feet of a per minute), and its average superabsorbent material vibrating sand trail value is 264 milligrams.Example 6
Except the basic weight of outer housing is increased to every cubic metre 9.8 gram, in example 6, adopts the same manner with example 5 to make and melt and spray the absorbent article core outer housing.The fiber diameter of sample is 3.7 microns, and the fibre diameter of 95% fiber is less than 7 microns.The sample machine direction under the peak load and the tensile strength on the cross machine when hygrometric state are respectively 884 grams and 407 and restrain.Machine direction when dry state under the peak load and the tensile strength on the cross machine are respectively 871 grams and 407 grams, and hygrometric state and the dry state tensile strength ratio on machine direction and cross machine is respectively 1.01 and 1.0.Sample percentage elongation on machine direction under peak load is 7%, is 13% on cross machine.The Frazier air permeability that records is 121.1 cubic metres every square metre of per minutes (397 cubic feet every square feet of a per minute), and the mean flow pore size that Coulter pore instrument records is 27 microns.The aperture greater than 50 microns micropore less than 5%.Adopt the vibrating shakeout test same with example 5, the material in the example 6 does not measure the vibrating shakeout of superabsorbent material.Example 7
In example 7 with same polymer, adopt with aforesaid two examples in same way as production melt and spray the absorbent article core outer housing, except the basic weight of absorbent article core outer housing further is increased to every square metre 12.2 gram.Fiber diameter is 4.3 microns, and the fibre diameter of 89% fiber is less than 7 microns.The specimen material machine direction under the peak load and the tensile strength on the cross machine when hygrometric state are respectively 1092 grams and 542 and restrain.Value when dry state is machine direction 1065 grams and cross machine 519 grams.The tensile strength of hygrometric state and dry state is 1.03 than in machine direction, is 1.04 on cross machine.Percentage elongation on the machine direction under the peak load is 5%, is 12% on the cross machine, and the Frazier air permeability that records is 96.7 cubic metres every square metre of per minutes (317 cubic feet every square feet of a per minute).The mean flow pore size that Coulter pore instrument records is 28 microns, is less than 5% micropore size greater than 50 microns.Adopt the vibrating shakeout identical with example 5 and example 6 to test, the vibrating shakeout test value that records the superabsorbent material is less than 0.1 milligram.Example 8
The basic weight of polypropylene melt-blown absorbent article core outer housing is increased to every square metre 14.2 gram in example 8, and fiber diameter is 4.0 microns.Machine direction during dry state under the peak load and the tensile strength on the cross machine are respectively 1221 grams and 517 grams, and the machine direction when hygrometric state under the peak load and the tensile strength of cross machine are respectively 1238 grams, 530 grams.Tensile strength when hygrometric state and dry state under peak load is respectively 1.01 and 1.03 than in machine direction with on cross machine.The percentage elongation of sample on the machine direction under the peak load is 4%, is 6% on the cross machine.The Frazier air permeability that records sample is 80.8 cubic metres every square metre of per minutes (265 cubic feet every square feet of a per minute), and the mean flow pore size that Coulter pore instrument records is 28 microns, is less than 5% micropore size greater than 50 microns.Adopt as same test procedure that example 5 is used to the example 7, the vibrating shakeout test value of the superabsorbent material that records is 1.8 to restrain.Example 9
In example 9, use with aforesaid example in the polymer of the same type that adopts make the melt-blown nonwoven net of same type.The basic weight of final absorbent article core outer housing is every square metre 15.0 gram, and fiber diameter is 2.8 microns.Machine direction during dry state under the peak load and the tensile strength on the cross machine are respectively 1512 grams and 701 grams, and the percentage elongation on machine direction and cross machine is 20% and 35%.Mean flow pore size is 20 microns, and the maximum stream flow aperture is 31 microns.The Frazier air permeability is 65.3 cubic metres every square metre of per minute per minutes (214 cubic feet every square feet), and the superabsorbent material weight that the test of bag vibrating shakeout obtains is 6.8 milligrams.
The absorbent article core that adopts the identical materials parcel to constitute by 10 gram Dow 534 superabsorbent materials and 10 gram Kimberly-Clark CR-54 fine hair.But this absorbent device is inserted into successively the structure of the top flat/body side liner that is arranged in transflective liquid and the egative film or the sheath of diaper.
Example 1 to example 9 has been showed key characters more of the present invention.The absorbent article core outer housing must have enough abilities of sealing the superabsorbent material granule, and same absorbent article core outer housing must have and can form the required enough air permeabilities of absorbent article core.These examples show, preserve the superabsorbent material best be to be every square metre 15 absorbent article core outer cover material that restrains and be lower than this value with basic weight.In a word, have been found that the fibre diameter as fruit fiber remains on less than 8 microns, mean flow pore size is better during less than 30 microns.Also can adopt the material of higher basis weights, but this will increase the cost of total.In addition, high basis weight materials may reduce the Frazier air permeability of material.The Frazier air permeability is lower than 61 cubic metres every square metre of per minutes (200 cubic feet every square feet of per minutes), can make to form difficulty of absorbent article core on the absorbent article core outer cover material.
Can know by detailed description of the present invention and to see, can under the prerequisite that does not deviate from marrow of the present invention and claims scope, carry out various remodeling and change the present invention.
Claims (16)
1. absorbent device comprises:
Have graininess superabsorbent material absorbent article core and
Be used to seal the fibrous nonwoven webs absorbent article core outer housing of described particulate material, described absorbent article core outer housing comprises many thermoplastic fibres, described absorbent article core outer housing has a plurality of mean flow pore size less than 30 microns micropore, and the aperture that wherein is no more than 5% micropore is greater than 50 microns, the hygrometric state that described absorbent article core outer housing has and the strength ratio of dry state are 0.5 or bigger on machine direction or cross machine, and described absorbent article core outer housing also has the Frazier air permeability of per minute 61 cubic metres every square metre (200 cubic feet every square feet of per minutes) at least.
2. absorbent device as claimed in claim 1 is characterized in that, described absorbent article core outer housing is 30% or littler along the percentage elongation under peak load on the machine direction.
3. absorbent device as claimed in claim 2 is characterized in that, described absorbent article core outer housing is 40% or littler along the percentage elongation under peak load on the cross machine.
4. absorbent device as claimed in claim 1 is characterized in that, the vibrating shakeout test value of the graininess superabsorbent material of described absorbent article core outer housing is less than 60 milligrams.
5. absorbent device as claimed in claim 1 is characterized in that, but described absorbent article core includes the fiber of many heat bondings on described absorbent article core outer housing.
6. absorbent device as claimed in claim 1 is characterized in that, has at least 85% described fiber to have 8 microns or littler fibre diameter in the described absorbent article core outer housing.
7. absorbent device as claimed in claim 1 is characterized in that, has at least 95% described fiber to have 7 microns or littler fibre diameter in the described absorbent article core outer housing.
8. absorbent device as claimed in claim 1 is characterized in that, in the described absorbent article core outer housing less than the aperture of 1% described micropore greater than 50 microns.
9. absorbent device as claimed in claim 1 is characterized in that, described fibrous nonwoven webs absorbent article core outer housing is the netted thing of a polyolefin meltblown fibers.
10. a personal care product comprises a top flat and an egative film and the absorbent device as claimed in claim 1 between described top flat and described egative film.
11. personal care product as claimed in claim 10 is characterized in that, described product is a diaper.
12. personal care product as claimed in claim 10 is characterized in that, described product is a sanitary towel.
13. personal care product as claimed in claim 10 is characterized in that, described product is a training pants.
14. personal care product as claimed in claim 10 is characterized in that, described product is that an incontinent person uses underwear.
15. a technology of making absorbent device comprises:
Be squeezed into the liquid stream of many molten states by thermoplastic polymer, form the fibrous nonwoven webs thing molten state,
The liquid stream drawing-down of described many molten states is become many fibers, and with described fiber laydown on profiled surface, thereby form fibrous nonwoven webs absorbent article core outer housing with many micropores, the mean flow pore size of this micropore is less than 30 microns, and the aperture of the described micropore less than 5% is greater than 50 microns, simultaneously described fibrous nonwoven webs absorbent article core outer housing machine direction and or cross machine on hygrometric state be 0.5 or bigger with the dry strength ratio, and its Frazier air permeability is at least 61 cubic metres every square metre of per minutes (200 cubic feet every square feet of per minutes)
A large amount of graininess superabsorbent materials is deposited on the absorbent article core outer housing, then
Seal described absorbent article core outer housing, to encapsulate described graininess superabsorbent material.
16. technology as claimed in claim 15 is characterized in that, this technology also is included in before the described sealing step step that many water absorbent fibers is deposited on the described absorbent article core outer housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95197950A CN1095644C (en) | 1995-08-28 | 1995-08-28 | Thermoplastic fibrous nonwoven webs for use as core wraps in absorbent articles |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95197950A CN1095644C (en) | 1995-08-28 | 1995-08-28 | Thermoplastic fibrous nonwoven webs for use as core wraps in absorbent articles |
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| Publication Number | Publication Date |
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| CN1197384A CN1197384A (en) | 1998-10-28 |
| CN1095644C true CN1095644C (en) | 2002-12-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422504A2 (en) * | 1989-10-04 | 1991-04-17 | Kimberly-Clark Corporation | Hygienic absorbent article |
| EP0470392A1 (en) * | 1990-07-12 | 1992-02-12 | Kimberly-Clark Corporation | Absorbent article |
| GB2269109A (en) * | 1992-07-31 | 1994-02-02 | Kao Corp | Absorbent article |
| CN1089546A (en) * | 1992-12-31 | 1994-07-20 | 金伯利-克拉克公司 | The non-woven material of improved anti-particle breakthrough |
| CN1090899A (en) * | 1992-12-14 | 1994-08-17 | 金伯利-克拉克公司 | Stretched meltblown fabric with barrier property |
| EP0627210A2 (en) * | 1993-05-03 | 1994-12-07 | Kimberly-Clark Corporation | Sanitary absorbent article |
-
1995
- 1995-08-28 CN CN95197950A patent/CN1095644C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422504A2 (en) * | 1989-10-04 | 1991-04-17 | Kimberly-Clark Corporation | Hygienic absorbent article |
| EP0470392A1 (en) * | 1990-07-12 | 1992-02-12 | Kimberly-Clark Corporation | Absorbent article |
| GB2269109A (en) * | 1992-07-31 | 1994-02-02 | Kao Corp | Absorbent article |
| CN1090899A (en) * | 1992-12-14 | 1994-08-17 | 金伯利-克拉克公司 | Stretched meltblown fabric with barrier property |
| CN1089546A (en) * | 1992-12-31 | 1994-07-20 | 金伯利-克拉克公司 | The non-woven material of improved anti-particle breakthrough |
| EP0627210A2 (en) * | 1993-05-03 | 1994-12-07 | Kimberly-Clark Corporation | Sanitary absorbent article |
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| Publication number | Publication date |
|---|---|
| CN1197384A (en) | 1998-10-28 |
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