CN1056997A - Sanitary towel with soft edges - Google Patents

Abstract

A kind of sanitary towel with round the flexible sideband of absorbent core, this flexibility sideband forms by egative film is incorporated on the top sheet along a seam crimping or heat sealing in absorbent core outside.The inside of sealing or crimping is placed on flexible sideband trailing edge made to exist between egative film/top sheet seam and flexible sideband trailing edge does not have adherent top sheet and stock footage so that a soft edge along the sanitary towel rear end to be provided.Built-in trailing edge seam form a kind of than egative film/top sheet seam be close to the sanitary towel of trailing edge comfortable the sanitary towel of Duoing.In another embodiment, seam is located at the inside of sideband periphery so that the sanitary towel with softer more comfortable edge to be provided.

Description

Sanitary towel with soft edges

The present invention relates to dress to help the excremental disposable absorbing articles of collection of bodily, particularly be used to collect the excremental sanitary towel of menstruation, especially relate to having and make wearer feel the sanitary towel at soft and comfortable edge.

Collect menstrual fluid and other vagina Excreta and prevent to make dirty the clothes of wearer and the sanitary towel of bedding are being known in the art.Menstruation stops immediately fast once discharging from wearer, is a target of sanitary towel for a long time.Generally speaking, sanitary towel all has identical basic structure: the top sheet that contacts with user of the saturating liquid of a slice, a slice is liquid-tight, prevent the egative film that body excretions is overflowed from sanitary towel, and one is enclosed between top sheet and the egative film in order to the excremental intermediate absorption fuse of absorbing bodily.

In general, top sheet and egative film stretch out outside the absorbent core periphery, and seal so that fully absorbent core is sealed and prevented not to be absorbed the body fluid of the discharge that fuse absorbs make dirty the clothes, clothing, bedding etc. of wearer genital area.Regrettably, provide effective containment role though the egative film/top sheet of sanitary towel's periphery is sealed to the body fluid of discharging, this seals also can produce and makes the uncomfortable hard edge of wearer.Hard edge along the rear end of sanitary towel feels out (that is, the edge with the buttocks contact of sanitary towel) especially easily, to thin, flexible and sanitary towel next to the shin, this uncomfortable feeling even more remarkable.

Modern sanitary towel has for a long time on the underwear that sanitary towel is fixed to wearer always and this sanitary towel is remained on the tram device with the menstruation that stops discharge, and this device generally is a pressure adhesive.But in fact underwear may not can and the motion of the coordination of body of wearer.Particularly the crotch of wearer underwear may not can always maintains and aims at vaginal orifice and locate with respect to vaginal orifice.And, when wearer stretch one's legs, walk, sit down, or the like the time, sanitary towel may and reverse not with underwear fold, and sanitary towel is removed from desired aligned position.Therefore, in use, when sanitary towel is moving about and its edge when being pressed against on the sensitive skin of wearer, the hard edge of sanitary towel (sealing generation by the top sheet/egative film of periphery) may make wearer produce very uncomfortable feeling.

Find at present, can obtain softer, more flexible edge by top sheet/egative film being sealed be arranged on from the inside place of the outward flange of sanitary towel.This built-in a kind of outward flange in sanitary towel of formation that seals has the sanitary towel that does not have adherent top sheet and stock footage.With comparing than rough edge of occurring in the conventional sanitary towel that egative film and top sheet are sealed along the sanitary towel neighboring, this do not have adherent material that softer, more flexible edge is provided.

Provided a kind of sanitary towel once doing many trials in the art, some more successful than other were wherein arranged with softer, more comfortable edge.For example, the United States Patent (USP) 3,881,490 of investing people such as Whitehead on May 6th, 1975 discloses a kind of sanitary towel, and the absorbent material terminating of its fuse is not enclosed in the jacket on the periphery of sanitary towel.Though this sanitary towel provides comfortable soft limit for user, it has short this slurry villus fiber sealing edge position shortcoming of falling the end and suppressing medium leakage to volume menstruation stream unsatisfactorily never.The United States Patent (USP) 4,518,451 of investing people such as Luceri on May 21st, 1985 discloses a kind of C shape sanitary towel folding, that have soft longitudinal edge.But because the thickness of longitudinal edge, the sanitary towel that C shape is folding can not conform to women's perineum part well, and therefore the sanitary towel that does not conform to human body is comfortable.In addition, owing to only be that longitudinal edge has C shape folding, this sanitary towel still has harder uncomfortable transverse edge.

Therefore, there is consumer's requirement of a reality, requires to provide a kind of sanitary towel that has comfortable, soft, flexible edge and effective containment role can be provided the body fluid of discharging.This consumer to soft, comfortable edge requires thin, flexible closed-fit sanltary towel remarkable especially.

Thereby an object of the present invention is to provide and a kind ofly have comfort that soft, flexible edge increases user and absorbing and containing menstrual fluid and other vagina Excreta is effective sanitary towel.

Another object of the present invention provide a kind of thin and flexibility, have soft edge and the sanitary towel of the stickiness that improved, comfort and low wearing sensation be provided to consumer.

These and other some purpose of the present invention can be seen from following explanation.

The present invention is a kind of liquid-tight egative film of top sheet, a slice and sanitary towel that is encapsulated in the absorbent core between top sheet and the egative film with the saturating liquid of a slice.Top sheet and egative film circumferentially engage along a seam in absorbent core outside, and the transverse edge that this seam is arranged on top sheet and egative film is inwardly at least about the place of 1.0mm.Top sheet/egative film seam is preferably by form material crimping or heat-seal bond together.Built-in transverse joint forms the adherent top sheet/stock footage that do not have of a lateral end edges constituting sanitary towel.This do not have adherent material to provide a kind of softer, more comfortable end edge to wearer.

In a preferred embodiment, sanitary towel has the thin flexible sideband of a circle around absorbent core, this sideband from the protruding about 0.3cm of absorbent core to about 2.0cm.This edge band is made of the part outside the periphery that stretches out absorbent core of top sheet and egative film.In a particularly preferred embodiment, top sheet/egative film seam is arranged on the sideband periphery edge inwardly at least about the place of 1.0mm.In other words, the outer peripheral edge of sanitary towel is not by there being adherent top sheet/stock footage to form, thereby is softer, and makes wearer more comfortable.

Fig. 1 is the top plan view of sanitary towel of the present invention, and part is torn so that following structure to be shown.

Fig. 2 is the longitudinal sectional view of the embodiment of sanitary towel shown in Figure 1 that gets along 2-2 line among Fig. 1.

Fig. 3 is the transverse sectional view of the embodiment of sanitary towel shown in Figure 1 that gets along 3-3 line among Fig. 1.

Fig. 4 is the top view of another preferred embodiment of sanitary towel of the present invention, and part is torn so that following structure to be shown.

Fig. 5 is the top view of the another preferred embodiment of sanitary towel of the present invention.

Fig. 6 is the longitudinal sectional view along another preferred embodiment of the sanitary towel of the present invention that 2-2 line among Fig. 1 is got.

Fig. 7 is the transverse sectional view along another preferred embodiment of the sanitary towel of the present invention that 3-3 line among Fig. 1 is got.

Though presents with specifically note and clearly claimed claims of the present invention believe that as summary the present invention can be more readily understood by reading carefully below in conjunction with the accompanying drawing detailed description of the present invention.

As shown in Figure 1, the present invention is a kind of disposable absorbent article, particularly a kind of sanitary towel 20.Terminology used here " sanitary towel " refer to a kind of women be worn near genital area, (for example be used to absorb and hold the various exudates of discharging in the body, menses and urine), and (that is, do not plan washing, recovery or re-use) article of preparing disposable use after, just to abandon.Here employed term " pudendum " refers to outside visible female sex organs.

Sanitary towel 20 has a roughly longitudinal axis 14 of centering.Terminology used here " vertically " is meant imaginary line, axis or a direction of sanitary towel 20, this line, axis or direction generally are centering between the two edges of sanitary towel 20, and roughly aim at the vertical plane that the wearer that will stand is divided equally into left and right sides halfbody.Term " laterally " be meant one roughly with vertical quadrature and the imaginary line in the plane of sanitary towel 20, axis or the direction of sanitary towel, and roughly aim at wearer in the horizontal.

Sanitary towel 20 is characterised in that it has the top sheet 22 of a saturating liquid, a liquid-tight egative film 24 and the absorbent core 26 between top sheet 22 and egative film 24.It is that the connection means of knowing are connected on the egative film 24 that top sheet 22 is used in sanitary towel's technical field.For example, the connection means can be crimping, heat-sealing, hotmelt, or ultrasonic bonding.

Top sheet 22 is connected in the optimal way and structure that egative film 24 gets on a kind of, top sheet 22 and egative film 24 are made has the shape that is similar to absorbent core 26, but total greater than absorbent core 26.Therefore, top sheet 22 is protruding from the longitudinal edge 30 and the transverse edge 31 of absorbent core 26.Similarly, egative film 24 is protruding from the longitudinal edge 30 and the transverse edge 31 of absorbent core 26.Top sheet 22 and egative film 24 are in the outside of described absorbent core 26, along seam 34, be connected means, preferably couple together along periphery by crimping or heat-sealing by above-mentioned any.

Fig. 1 illustrates the top plan view of sanitary towel 20 of the present invention, and Fig. 2 is the longitudinal sectional view along the sanitary towel 20 that the 2-2 line among Fig. 1 is got.As shown in Figure 1, top sheet 22 has two longitudinal edges 28 and two transverse edges 29.Similarly, egative film 24 also has two longitudinal edges 32 and two transverse edges 33.In a preferred embodiment, seam 34 inwardly is arranged on from the transverse edge 33 of the transverse edge 29 of at least one described top sheet or at least one described egative film at least about 1.0mm, is preferably about 1.5mm to about 15.0mm, and best is the extremely place of about 10.0mm of about 2.0mm.This built-in transverse joint forms does not have adherent top sheet or stock footage, forms the transverse edge 39 as a sanitary towel that is clear that in Fig. 3.

Fig. 3 is the transverse sectional view along the sanitary towel 20 that the 3-3 line among Fig. 1 is got.As shown in Figure 3, seam 34 is arranged on the outside of the transverse edge 31 of absorbent core 26, in the inside of the transverse edge 33 of the transverse edge 29 of top sheet 22 and egative film 24.Therefore, there are not adherent top sheet 22 and egative film 34 will form in the health transverse edge 39 of 20.

Find unexpectedly, the seam of the top sheet/egative film transverse edge from top sheet or egative film inwardly is provided with, can make this sanitary towel have the much higher comfort of degree, particularly along the position of sanitary towel rear end (that is, sanitary towel is with the edge of wearer buttocks contact).There is not adherent material that softer, the more comfortable edge, edge of sanitary towel of the back transverse edge of the outside that a kind of seam than those top sheet/egative films is stretched over sanitary towel is provided.Though (seam is embodied in the rear end of sanitary towel toward the largest benefit of interior setting from the periphery edge of sanitary towel, but tangible comfortable sensation also can embody by top sheet/egative film seam is provided with toward in from any or other all periphery edges of sanitary towel, and this problem is discussed below).

As mentioned above, top sheet 22 and egative film 24 have generally length and the width dimensions bigger than absorbent core 26, and therefore, they stretch out outside the edge 30 and 31 of absorbent core 26, circumferentially link together along seam 34 in the outside of described absorbent core 26.The extension that top sheet 22 and egative film 24 stretch out absorbent core transverse edge 31 and absorbent core longitudinal edge 30 constitutes the sideband 35 that surrounds absorbent core 26.This sideband has two transverse edges 51 and two longitudinal edges 52 of the periphery 36 that forms sanitary towel 20.(transverse edge 51 of sideband and longitudinal edge 52 general respectively with the transverse edge 29 of top sheet and longitudinal edge 28, with/or the transverse edge 33 and the longitudinal edge 32 of egative film are consistent, depend on the specific dimensions and the geometry of top sheet and egative film).Sideband has the character that keeps shape owing to possessing round absorbent core 26.Though sideband 35 has the characteristic that keeps shape, in use it is that approach, flexible, comfortable and is easy to follow round the shape such as the fluid drainage point near zone of the genital area of human body and is consistent.

Compare with the same sanitary towel that does not have sideband 35, sideband 35 provides improved safeguard procedures, and near zone round the fluid drainage district prevents to make dirty.Therefore, sideband 35 should have enough width and makes dirty with the drained liquid that prevents from not to be absorbed fuse 26 and absorb and nestle up near the clothes of fluid drainage point, clothing, bedding etc.For example, in a preferred embodiment, the sideband of sanitary towel 20 has one is enough to guarantee that sanitary towel 20 covers the width of the crotch area of wearer underwear.Sideband 35 from the protruding one section distance of the transverse edge 31 of absorbent core 26 and longitudinal edge 30 with from about 0.3cm to about 2.0cm be, be more preferably from about 0.5cm to about 1.5cm, best be to be about 1.0cm.Sideband 35 can have a uniform width, perhaps can have a width that changes along the periphery 36 of sanitary towel 20.

In a preferred embodiment, as shown in Figure 1, seam 34 inwardly is arranged on from least one described sideband transverse edge 51 at least about 1.0mm, is more preferably from about 1.5mm to about 15.0mm, best be from about 2.0mm place of about 10.0mm extremely.In another preferred embodiment, as shown in Figure 5, seam 34 inwardly is arranged on from the periphery 36 of described sideband 35 at least about 1.0mm, is more preferably from about 1.5mm to about 5.0mm, best be place from about 2.0mm to 10.0mm.This built-in peripheral seam forms a kind of outer peripheral sanitary towel that does not have adherent top sheet and stock footage that forms sanitary towel that has.As previously mentioned, along the comparing of the conventional sanitary towel of the neighboring sealing-in of sanitary towel, there is not adherent material that softer, more flexible edge is provided with egative film and top sheet than rough edge.In the preferred embodiments of the present invention, sideband 35 is from the protruding about 0.5cm of described absorbent core to about 1.5cm, and seam 34 is arranged on the place of the inside about 2.0mm of periphery of described sideband to about 10.0mm.

Continuation is inquired into each parts in more detail with reference to figure 1, top sheet 22 be sanitary towel be in contact with it and receive the component parts of body excretions towards wearer's body.Top sheet 22 is liquid thoroughly, and should be flexible not chafe.Terminology used here " flexible " be meant that those are submissive and be easy to meet health shape or easily deformable material under the effect of power externally.Top sheet 22 had better not be bright-colored, distinguishes to provide to wearer.Top sheet 22 should clean in appearance, and be opaque a little with cover absorbent core 26 collected and absorb body excretions.

Top sheet 22 also should have good penetrating and wet performance again, allows body excretions promptly to penetrate top sheet 22 and arrives absorbent cores 26, but can not pass on the skin that top sheet 22 flow back into wearer.Suitable top sheet can be made with non-woven material and porous polyolefin film.

Top sheet 22 has many apertures to allow fluid accumulation thereon so that pass through on the absorbent core 26.A kind ofly have about perforated area of 5 percent to 60, typically have 25 percent perforated area, thickness to be suitable for approximately from about 0.15 to about 0.7mm porous polyolefin film top sheet 22.

Need, top sheet 22 can be sprayed the layer of surface activator and is penetrated on the absorbent core 26 with enhance fluid.Surfactant generally is non-ionic and should is chafe not.On top sheet 22, the about 0.01 milligram surfactant abundance of every sq is suitable.But a kind of recommendation is used for the Gree chemical company that the present invention's surfactant is Connecticut, USA, Greenwich (Glyco Chemical, Inc.) the Pegosperse 200ML of Chu Shouing.

A kind of specially suitable top sheet 22 also can be invested people's such as Radel United States Patent (USP) 4 according to August 3 nineteen eighty-two, 342, invested people's such as Ahr United States Patent (USP) 4 on July 31st, 314 and 1984,463,045 makes, in order at length to disclose the preferred enforcement of liquid top sheet, these patents are by quoting as proof in conjunction with in this application.(Tredegar Industries, Inc.) model of Chu Shouing is that the saturating liquid top sheet 22 that the porous shaping membrane sheet of X-3265 or P1552 is made finds that working conditions are good in the Te Liedi processing industry company of a kind of Te Leihuote by Indiana, USA.

Egative film 24 can be with making such as the so any flexibility of polyolefin film material liquid-tight or anti-liquid, and prevent that sanitary towel 20 is collected and the Excreta held, particularly be absorbed in the clothes and the bedding of the outer and wearer of making dirty of Excreta effusion sanitary towel 20 in the absorbent core 26.Egative film 24 had better not be bright-colored, distinguishes to provide to wearer.

Egative film 24 can also impermeable foul gass by the body excretes deposits yields that absorbs, and make the unlikely effusion of this stench and wearer is felt.A kind of thickness is about 0.15 to 0.7 millimeter, preferably be about 0.51 millimeter low density polyethylene backsheet 24 finds that working conditions are good.A kind of polyethylene film is that the thin film of XP-39385 finds to be particularly suitable for this purposes such as the model of being sold by Te Liedi processing industry company.

In addition, egative film 24 can by a kind of be that the soft cloth shape material of hydrophobicity is made with respect to top sheet 22, for example, the egative film 24 of a kind of polyester or polyolefine fiber is suitable for.A kind of egative film 24 materials of recommendable especially soft cloth shape are such as the United States Patent (USP) 4 of investing Wnuk on October 9th, 1984 by a kind of, 476, the laminated material that polyester nonwoven material sheet described in 108 is made, this patent is by quoting as proof in conjunction with in this application.Basic weight is that to knit suitable Hydroentangled fabric be suitable for every square metre of about 37 grams non-.A kind of suitable supatex fabric can be buied as the zero strain fabric from the International Paper Company (International Paper Company) of the Wei Lateke non-woven fabric group of the Wal bohr of Massachusetts, United States.

Need, the export-oriented face of egative film 24 can comprise the device on a kind of underwear that sanitary towel is attached to wearer.It is fixing apparatus that preferred attachment device includes mechanical type, perhaps is more preferably pressure adhesive 48.As shown in Figure 2, pressure adhesive 48 preferably becomes two parallel bands to be laid on the export-oriented face of egative film 24, and described splicing tape is arranged on every side of longitudinal axis of egative film 24.The width of splicing tape can be from about 5 to about 20 millimeters.Another kind of mode, bonding agent can become one roughly on the form of the rectangular patches at center is laid in egative film 24, be covered with egative film 24 export-oriented face about 30 percent to about area of 70 percent.The another kind of mode that will discuss in more detail below is that pressure adhesive 48 was arranged near (as shown in Figure 4) on the position of far-end with respect to vertical centering of each fin 44.Suitable pressure adhesive 48 is the Century adhesive A 305-4 by 0.02 mil thickness of the sectional anker Continental AG supply of 3 sigmas of Ohio, USA card Winton.Bonding agent 48 the most handy peelable paper (not shown) cover to prevent to be stain and occur undesirable adhesion before using.

Absorbent core 26 is in order to collect and to hold the device of the body excretions of the menstruation of particularly gathering top sheet 22 or that pass liquid thereon.Absorbent core 26 is the members that receive and retain body excretions in the sanitary towel.Absorbent core 26 should be comfortable and chafe not.Absorbent core 26 can be made shape orthogonal or hourglass shape.Absorbent core 26 preferably has two relative faces, and a face is towards egative film 24, and another face is towards top sheet 22.

Absorbent core 26 can be made with the imbibition material that many kinds are used in disposable sanitary towel, diaper and other absorbent commodity usually.Suitable absorbent material comprises gellant or any suitable material or the combination of these materials of the polymer that grinds wood pulp, the cellulose wadding that creases, multi-layer thin cotton paper, absorbent foam, absorbable sponge, synthetic staple, polymeric fiber, formation hydrogel that is commonly referred to as air felt (airfelt).If select the tissue paper fuse for use, tissue paper can be with United States Patent (USP) 4,191,609 disclosed a kind of preferred tissue papers that are applicable to sanitary towel 20 as described herein of investing Trokhan on March 4th, 1980.This patent is attached among the application by quoting as proof.Recommendable especially absorbent material is the polymerization gellant.The polymerization gellant is that those follow the material that such fluid (being liquid) contact just sucks these fluids and forms hydrogel such as water or body fluid.Like this, discharge the fluid enter absorbent core 26 and can be aggregated gellant and catch and maintain, thereby enhanced absorption ability and improved fluid retention performance are provided for the article in it.

The polymerization gellant comprise usually a kind of water-fast basically, slight crosslinked, part is neutral, the particle that forms the polymeric material of hydrogel.These polymeric materials can prepare from polymerisable, unsaturated acidiferous monomer.The suitable unsaturated acid monomer that is used to prepare the used polymerization gellant of the present invention comprises that those are listed in the United States Patent (USP) 4 of investing being entitled as of Brandt, Goldman and Inglin " composition of polymer that is used for the formation hydrogel of absorbent structure " on March 31st, 1987,654, monomer in 039, this patent is attached among the application by quoting as proof.Preferred monomer comprises acrylic acid, methacrylic acid and 2-acrylamide-2-methyl propane sulfonic acid.The special recommendation of acrylic acid own is used to prepare the polymerization gellant material.

In forming the polymerization gellant of hydrogel, the polymeric component that forms by unsaturated acidiferous monomer can be grafted on other type such as on starch or the cellulosic polymer moieties.Such polyacrylate grafting starch material with here be hold not recommendable.

The preferred polymers gellant that can be prepared by the monomer of general type comprises starch, polyacrylate graft starch, polyacrylic acid lipid, cis-butene two (acid) acid anhydride base co-polymer and its mixture of hydrolyzed acryionitrile grafted.Recommendable especially is polyacrylate and polyacrylate graft starch.

No matter the basic polymers compositions with the polymerization gellant of the formation hydrogel on the absorbent core 26 here is the character of what sample, these materials are normally slight crosslinked.It is water miscible basically that the crosslinked polymerization gellant that makes formation hydrogel used in this invention becomes, thus the gelinite volume (gel volume) of the hydrogel that formed by used polymerization gellant of crosslink part ground decision and the characteristic of extractible polymer.Suitable crosslinking agent is being known in the art, comprises, for example is described in detail in those cross-linking agent in the United States Patent (USP) 4,076,663 of investing people such as Masuda on February 28th, 1978, and this patent is by quoting as proof in conjunction with in this application.The cross-linking agent of recommending is the diester or the polyester of unsaturated monocarboxylic or polycarboxylic acids and polyprotic acid, bisacrylamide and two or triallylamine.Best cross linkage agent is N, N '-methylene-bisacrylamide, trimethylolpropane triacrylate and triallylamine.Cross-linking agent comprises the polymeric material of formation hydrogel of the generation of about 0.001 mole percent to 5.0 mole percent usually.Be more preferably the polymerization gellant that cross-linking agent comprises the used formation hydrogel of about 0.01 mole percent to 3.0 mole percent here.

Can be used in the sanitary towel of the present invention slight crosslinked, the polymerization gellant that forms hydrogel usually with in its part and form using.For purposes of the invention, these materials are considered to partly be neutralized, when monomeric at least 25.0 mole percents that are used to form polymer, preferably at least 50.0 mole hundred be the monomer that contains the carboxylic acid group than number, these monomers are in using a kind of salifiable cation and mistake.Suitable salt-forming cation comprises alkali metal, ammonium, replacement ammonium, and amine.The percentage rate that contains through the monomeric total monomer of neutral acidic group that is utilized is known as " degree of neutralization " here.

Must have the higher fluidic ability of running in these article that is absorbed in the polymeric gel gel material in the absorbing articles here." the gelinite volume " of the polymerization gellant that the absorbability of these materials can be selected for use by reference in the present invention comes quantitatively.

For purposes of the invention, the gelinite volume can limit by the amount of the synthetic urine that absorbed by any given polymerization gellant, and is expressed as the gram number of the synthetic urine of every gram polymerization gellant.Gelinite volume in synthetic urine can be determined with the suspension that about 20 parts of synthetic urine constitute by about 0.1-0.2 part polymerization gellant of doing to be tested by one.This suspension stirs one section time enough at ambient temperature lenitively, and for example about 1 hour, to reach the expansion balance.Then the ratio of the cumulative volume of the weight percent of the polymerization gellant from suspension and liquid capacity of discharging from the hydrogel that forms and suspension calculates the gelinite volume of the polymerization gellant that the gram numerical table with the synthetic urine of every gram polymerization gellant shows.

Gelinite volume with the gellant of 26 li of the absorbent cores here is roughly every gram polymerization gellant at least about the synthetic urine of 20.0 grams.The gelinite volume of the material that uses be preferably every gram polymerization gellant about 20.0 to about 60.0, best be about 22.0 to the scope of the synthetic urine of about 35.0 grams.

In the sheet material that forms absorbent core 26 laminations, the particle of polymerization gellant disperse is fully opened, but can be to distribute equably or unevenly.Specifically, can there be some zones to have gellant particle on the fuse lamination than other the regional higher concentration on this fuse lamination.

In a preferred embodiment, in sanitary towel 20 of the present invention, the polymerization gellant that forms hydrogel spread over this sanitary towel at least about 17.0 square centimeters, be more preferably at least 50.0 square centimeters of sanitary towel, preferably at least 100.0 square centimeters the area of sanitary towel.The abundance that forms the polymerization gellant of hydrogel be, is more preferably every square centimeter about 0.003 and restrains about 0.008 gram, best be every square centimeter about 0.004 and restrain about 0.007 and restrain with every square centimeter of about 0.001 gram to about 0.009 gram.The polymerization gelatinization agents content of the formation hydrogel of absorbent core 26 be by weight 5.0% to 85.0% for good, be more preferably about 10.0% to about 70.0%, best be about 15.0% to about 55.0%.

In preferred embodiment shown in Figure 2, absorbent core 26 is one and contains the lamination that one deck is arranged on the super absorbent polymer material between the two layers of thin cotton paper.A kind of suitable lamination is to be the registered trade mark of corn processing company by the super-absorbert lamination WATER-LOCK L-535(WATER-LOCK that the Muscatine corn in iowa,usa state processing company (Grain Processing Corporation) provides).This super-absorbert lamination is disclosed in the United States Patent (USP) 4 that is entitled as " composition of absorbing membrane and preparation method thereof " of investing people such as Pedersen on August 21st, 1984,467,012 and invest people's such as Lindsay the United States Patent (USP) 4 that is entitled as " processing method of lamination absorber " (Laminated Absorbent Process) on April 7th, 1981,260, in 443, these patents are by quoting as proof in conjunction with in this application.WATER-LOCK L-535 contains the aquogel polymer of every square centimeter 0.005 gram, but has found that the reinforced of every square centimeter 0.001 to 0.009 gram is acceptable.Two tissue plies provide containing for the super absorbent polymer material, improved the exudate that absorbed on whole absorbent core 26 horizontal capillarity and absorbability to a certain degree is provided.

The total absorptivity of absorbent core 26 does not need more too many greatly than the total amount of body excretions to be absorbed.For making wearer comfortable, absorbent core 26 preferably narrow, thin.For the embodiment that here describes, the ability of absorbent core 26 should be the saline solution at least about 2 grams percent 0.9.Suitable saline solution is to be sold by the Te Lawen Nore laboratory of Illinoi State, The United States Deerfield.

As previously mentioned, absorbent core 26 tears up when preferably being enclosed between top sheet 22 and the egative film 24 and wearing in sanitary towel 20 with the absorbing material that prevents this absorbent core or breaks away from, and guarantees correct the holding of body excretions.This structure also provides a kind of black box.

In addition, when one of sanitary towel's 20 usefulness have about 80.0 gram test weight and about 10.0 grams, have diameter when being about relatively rule that 2.54 centimetres, contact surface area are about 5.1 square centimeters comparator leg and measuring, have one less than about 4 millimeters, preferably less than 2.6 millimeters thickness.And the surface area of the top sheet 22 of sanitary towel 20 of the present invention should be at least about 100 square centimeters, flows to beyond the zone of action with the fluid that prevents to discharge.

Absorbent core 26 preferentially joins on the top sheet 22, and also can join on the egative film 24.Term " joint " refers to first member or component parts directly or fixing indirectly or join state on second member or the component parts to, in indirect joint situation, first member or component parts are fixed or are joined on an intermediate member or the component parts, and this intermediate member or component parts are fixed again or joined on second member or the component parts.Engagement relationship between first member or component parts and second member or component parts was maintained in the service life of sanitary towel 20 always.

Engage preferentially by absorbent core 26 being realized on top sheet 22 or egative film 24 with bonding agent.Bonding agent can be coated with by any suitable spray patterns, as globule spiral or that vertically arrange.Bonding agent should be anti-surface active and pressure-sensitive be low, it can not adhered on the skin of wearer.

Sanitary towel 20 can also comprise a slice and be arranged on soak method (wet-laid) cotton paper 50 between top sheet 22 and the absorbent core 26.This soak method cotton paper 50 is liquid thoroughly.A kind of suitable soak method cotton paper 50 have every square metre about 15.8 the gram basic weight and under the pressure differential of about 12.8 millimeters of water, every square metre of about air permeability of 30.5 cubic metres of per minute.Soak method cotton paper 50 preferably is kept perfectly when in use being got wet.Soak method cotton paper 50 preferably has every centimetre of horizontal wet tensile at least about 15.0 grams.Suitable soak method cotton paper 50 and manufacture method thereof are disclosed in the United States Patent (USP) 3 that is entitled as " method and this paper that pressed a kind of formation absorption paper of fabric knot pattern before drying " of investing Sanford and Sisson on January 31st, 1967,301, in 746, this patent is attached among the application by quoting as proof.Soak method cotton paper 50 can be by coming to be connected with top sheet 22 such as the adhesion means well known in the art of spray glue (spray-gluing) or bonding agent lines or idea.

Soak method cotton paper 50 has many purposes.Cotton paper 50 is used for any loose super-absorbert polymeric material is enclosed between cotton paper 50 and the top sheet 22, thereby has prevented the contact skin of these super-absorbent materials and wearer.Also have, cotton paper 50 has improved the horizontal capillarity of exudate on whole absorbent core 26 that is absorbed, thereby exudate is distributed on whole absorbent core 26 more equably.In addition, cotton paper 50 provides absorbability to a certain degree, further prevents to have arrived absorbent core 26 and the exudate that is absorbed rehumidifies the skin of wearer.

Sanitary towel 20 can also include the fin 44(that stretches out from the longitudinal axis 14 and the core of sanitary towel 20 and illustrate for the first time among Fig. 4).Term used herein " core " be meant sanitary towel intermediary, specifically be on side direction intermediary and by fin 44 that proximal limited was that part of.

Fig. 4 is the top plan view of another preferred embodiment of sanitary towel of the present invention.In this embodiment, sanitary towel 20 has two fins 44, and each fin is near a longitudinal edge 38 and laterally overhanging from this longitudinal edge 38 of sanitary towel 20.Fin 44 can be top sheet 22, egative film 24 or both stacked integrally formed in abutting connection with extending part.Another kind of scheme is, fin 44 can make discrete and independently material piece be bonded on the longitudinal edge 38 of sanitary towel 20.

Fin 44 has a near-end 45, and it generally overlaps with the joint of the longitudinal edge 38 that is connected sanitary towel 20, perhaps this proximal can with longitudinal edge 38 juxtaposed other positions on engage with sanitary towel 20.Fin 44 is laterally overhanging from sanitary towel 20, and terminating is on distal side edge 46, and longitudinal axis 14 point farthest of sanitary towel 20 is left in this distal side edge representative.Fin 44 can be any shape that requires, and Fig. 4 illustrates a kind of particularly preferred shape.Fin 44 also can be invested the United States Patent (USP) 4 of Van Tilburg according on May 20th, 1986, invested the United States Patent (USP) 4,687 of Van Tilburg on August 18th, 589,876 and 1987, the mode of lecturing in 478 is made, and these patents are by quoting as proof in conjunction with in this application.

Fin 44 preferably has a surface with fin 44 and attaches on the underwear of wearer or attach to device on another fin 44.This adhering device can be that mechanical type is a fixing apparatus, perhaps is more preferably pressure adhesive 48.If select pressure adhesive 48 for use, just should be arranged on it on the face that deviates from top sheet 22 of fin 44, make bonding agent 48 in fin 44 outside facing to the wearer underwear when the crotch portion of wearer underwear is wrapped.Suitable pressure adhesive 48 is the Century adhesive A 305-4 by 0.02 mil thickness of the sectional anker Continental AG sale of 3 sigmas of Ohio, USA card Winton.Bonding agent 48 the most handy peelable paper (not shown) cover to prevent to be stain and occur undesirable adhesion before using.

Second embodiment that selects fully of sanitary towel 20 of the present invention is illustrated among Fig. 6 and Fig. 7.This sanitary towel has the top surface plane shape identical with sanitary towel shown in Figure 1, but its longitudinal sectional view of getting along the 2-2 line as shown in Figure 6, and the transverse sectional view of getting along the 3-3 line then as shown in Figure 7.In this embodiment, sanitary towel 20 is provided with an absorbent core 26, liquid-tight egative film 24 and a topped material 56 that encases the liquid thoroughly of egative film 24 and absorbent core 26.Sanitary towel in the embodiment that this is selected fully and the sanitary towel's difference in the previous embodiment are that the topped material 56(of liquid is called top sheet 22 in front thoroughly) fully round absorbent core 26, liquid-tight egative film 24 is placed between the bottom of absorbent core 26 and topped material.In the possible embodiment (not shown) of another kind, the absorption chip encases then fully with top sheet basically and is placed on the egative film.

Though several certain embodiments of the present invention are exemplified and illustrate, concerning those those skilled in the art that, obviously can under the situation that does not break away from the spirit and scope of the present invention, make various other changes and improvements.

Claims (17)

1, a kind of sanitary towel, it comprises:

A slice has the top sheet of liquid thoroughly of two longitudinal edges and two transverse edges;

A slice has the liquid egative film thoroughly of two longitudinal edges and two transverse edges; With

Absorbent core between described top sheet and described egative film;

It is characterized in that described top sheet and described egative film circumferentially engage along a seam in described absorbent core outside, described seam is arranged on from least one described top sheet transverse edge or at least one described egative film transverse edge inwardly at least about the place of 1.0mm.

2, by the described sanitary towel of claim 1, it is characterized in that sanitary towel has a sideband round described absorbent core, described sideband has two longitudinal edges and two transverse edges, described sideband to about 2.0cm, and comprises the part of the circumferentially external described absorbent core of described top sheet and described egative film from the protruding about 0.3cm of described absorbent core.

3,, it is characterized in that described seam is arranged on from least one described sideband transverse edge inwardly at least about the place of 1.0mm by the described sanitary towel of claim 2.

4,, it is characterized in that described sideband from the protruding about 0.3cm of described absorbent core to about 2.0cm, and described seam is arranged on the place from the inwardly about 1.5mm of at least one described sideband transverse edge to about 15.0mm by the described sanitary towel of claim 3.

5,, it is characterized in that described seam is arranged on from the inside place at least about 1.0mm of the periphery of described sideband by the described sanitary towel of claim 2.

6,, it is characterized in that described seam is arranged on from the peripheral inside 1.5mm of the described sideband place of about 15.0mm extremely by the described sanitary towel of claim 5.

7,, it is characterized in that described sideband from the protruding about 0.5cm of described absorbent core to about 1.5cm, and described seam is arranged on the place from the inside about 2.0mm of the periphery of described sideband to about 10.0mm by the described sanitary towel of claim 6.

8,, it is characterized in that described absorbent core contains by weight the polymerization gellant for about 5% to about 85% formation hydrogel by the described sanitary towel of claim 3.

9, by the described sanitary towel of claim 8, it is characterized in that described sanitary towel has the thickness less than about 2.6mm.

10,, it is characterized in that described sanitary towel also includes described sanitary towel is attached to device on the underwear of wearer by the described sanitary towel of claim 9.

11, by the described sanitary towel of claim 10, it is characterized in that the device on the described underwear that sanitary towel is joined to wearer includes two splicing tapes, in every side of the longitudinal axis of described egative film a described splicing tape is set.

12, by the described sanitary towel of claim 11, it is characterized in that the device on the described underwear that described sanitary towel is joined to wearer also includes two fins that cross out, and has a described fin outwards to cross out on each longitudinal edge of described sanitary towel.

13,, it is characterized in that described absorbent core contains by weight the polymer for about 5% to about 85% formation hydrogel by the described sanitary towel of claim 5.

14, by the described sanitary towel of claim 13, it is characterized in that described sanitary towel has the thickness less than about 2.6mm.

15,, it is characterized in that described sanitary towel also includes described sanitary towel is attached to device on the underwear of wearer by the described sanitary towel of claim 14.

16, by the described sanitary towel of claim 15, it is characterized in that the described device that sanitary towel is joined on the wearer underwear includes two splicing tapes, each side of the longitudinal axis of described egative film is provided with a described splicing tape.

17, by the described sanitary towel of claim 16, it is characterized in that the device on the described underwear that described sanitary towel is joined to wearer also includes two fins that cross out, and has a described fin outwards to cross out on each longitudinal edge of described sanitary towel.

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