JP5504061B2 - Pants-type absorbent article - Google Patents

Description

  The present invention relates to a pant-type absorbent article such as a pant-type diaper, a sanitary pant, or an incontinence wearing article, and the article includes a web material having elasticity.

  The absorbent article formed with the core region and the body region is believed to fit comfortably around the wearer. For pant-type articles such as pants-type diapers, sanitary pants, and incontinence pants, the article can be pulled up and down over the wearer's buttocks, and the wearer or caregiver can easily wear the article It would be desirable to be able to easily remove the article if it becomes soiled. With such elastic pants, elastically stretchable sides and waist, usually provided with elastic material, such as elastic yarn, shrinkably attached between the back sheet and the front sheet It is known to make.

  Furthermore, it is known that the main body portion of the absorbent article is made of an elastic material such as a laminate bonded in a stretchable manner. Such a laminate can include a layer of meltblown elastomeric fibers that is stretched and sandwiched between outer layers of a spunbond web.

  Patent Document 1 discloses a stretchable outer cover for an absorbent article that exhibits a predetermined permanent deformation when a tensile force is applied. The extendable outer cover includes a necked laminate in the form of one layer made of a non-elastic film with a neck and one layer made of an elastic film. The film can be breathable.

  Patent document 2 is disclosing the elastic laminated body provided with the elastic film joined to the fiber layer in which the opposing side part does not have the 1st and 2nd elasticity. The laminate is made by joining a non-elastic fiber layer to an elastic film layer and then stretching the composite to break the non-elastic material. The elastic film material may be made of a material having air permeability. The laminate can be incorporated into an absorbent article.

  Patent Document 3 discloses a disposable pants-like undergarment having a stretchable front portion and a rear portion made of, for example, an elastic laminate. The absorbent assembly is secured to the front and rear. Further examples of absorbent articles partially made of an elastic laminate can be found in US Pat.

  International applications PCT / SE2004 / 001004, PCT / SE2004 / 001005, and PCT / SE2004 / 001415 are absorbent with an outer cover sheet in the form of an elastic laminate having improved properties such as fabric-like feel and appearance. It relates to goods.

  In order to obtain a good fit, improved comfort, and safety against leaks, it is important that the absorbent article has dimensions that match the wearer's relative dimensions. The relative dimensions of the article are also important, so the components or areas of the article must not be too large or too small relative to each other. Also, the overall dimensions of the article and the relative dimensions of its components can be adjusted to obtain an article having a more pant-like appearance. Elastic materials can be used to improve the fit, but are often expensive, so the part where elasticity is important has elasticity, and where it is less important (cheap) There is a need for articles comprising elastic materials. The correct choice of elastic and non-elastic materials must be made for different components or regions of the article so as to balance economics and good fit of the article. Furthermore, the elastic properties of the elastic web material used in the construction of the article must be kept as much as possible.

  There is also a need for improvements in the properties of absorbent articles comprising an elastic web material such as an elastic laminate, particularly its fit and appearance. Also important is the comfort and soft feel of absorbent articles of the type described above. In addition, improvements in the manufacturing method make it possible to keep manufacturing costs to a minimum, which is important for disposable items because disposable items are discarded after a single use.

US Pat. No. 6,552,245 International Publication No. 03/047488 pamphlet US Patent Application Publication No. 2004/0243086 US Pat. No. 6,476,289 Japanese Patent No. 10043235 European Patent Application No. 1035818

  An object of the present invention is to provide a pant-type absorbent article that avoids the problems associated with known articles of pant-type.

  This object is achieved by a pant-type absorbent article (such as a pant-type diaper, sanitary pant, or incontinence pant), which article has an absorbent assembly comprising an absorbent core and a body. Yes. The main body includes a front part and a rear part, and the front part and the rear part are joined together along two opposite longitudinal side edges to form a waist opening and a pair of leg openings. ing. At least one of the front part and the rear part includes an elastic web material. The article further includes a crotch portion disposed between the front portion and the rear portion in the longitudinal direction of the article. The front part has a predetermined length (b1) in the longitudinal direction, the rear part has a predetermined length (b3) in the longitudinal direction, and the crotch part has a predetermined length (b2) in the longitudinal direction. Yes. The absorbent assembly (3) is at least in the crotch portion and overlaps both the front and rear by a predetermined length, and the article has a longitudinal direction (y) and a transverse direction (x). Yes.

  According to one embodiment, the absorbent assembly overlaps less than 20%, preferably less than 10% of the respective front and back surface areas as measured in the extended state of the article. The phrase “stretched state” is described more fully below.

  In this way, the pant-type absorbent article is more easily applied to the shape of the wearer's body, thus providing good fit, improved comfort, and leakage safety. By using a combination of specific parts of the article, the use of the components can be made easier and the selection of the components can be best suited for a given part.

  In another embodiment of the invention, the article is defined by a front half defined by the edge of the article and the lateral centerline of the article, and by the edge of the article and the lateral centerline of the article. And have a second half. According to the present invention, the surface area of the first half is 80-90% of the surface area of the second half as measured in the extended state of the article.

  In a further embodiment of the invention, the article has a maximum width (c) in the transverse direction and a maximum length (b) in the longitudinal direction. According to the invention, the ratio of the maximum width (c) of the article to the maximum length (b) is 80% to 120%, preferably 90% to 110, as measured in the extended state of the article. %. Furthermore, the ratio of the length (b1) of the front part of the article to the width (c) is 25% to 35%, preferably 28% to 32% when measured in the extended state of the article. . The ratio of the rear length (b3) of the article to the width (c) is between 38% and 52% when measured with the article extended.

  The length of the crotch portion (b2) is 10 to 40%, preferably 20 to 40%, most preferably 25 to 35% of the total length of the article as measured in the extended state of the article. is there.

  In one embodiment, both the front and rear portions comprise the elastic web material.

  According to one aspect of the invention, the crotch portion of the article is substantially free of elastic web material, and the length of the crotch portion is substantially equal to the distance between the front and rear panels of elastic web material. be equivalent to.

  Preferably, the absorbent assembly comprises a liquid impermeable back sheet layer, a liquid permeable top sheet layer, and an absorbent core encapsulated between the back sheet layer and the top sheet layer.

  In one embodiment of the invention, the crotch portion comprises a crotch panel material, which is preferably a substantially inelastic web material and faces the garment under the absorbent assembly. On the side. Preferably, the inelastic web material is a non-woven material.

  According to one embodiment, the elastic web material is a laminate comprising first and second layers comprising fiber layers and an elastic film layer disposed between the first and second layers. . In a further embodiment, the elastic film layer is breathable.

  In one aspect of the invention, the elastic laminate has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 1500 g / m 2 in 24 hours, preferably at least 3000 g / m 2 in 24 hours. Yes.

  According to one embodiment, the elastic laminate comprises first and second fiber layers made of spunbond material, each layer being 10-35 g / m2, preferably 12-30 g / m2. More preferably, the elastic film layer having a weight of 15 to 25 g / m 2 and the breathable elastic film layer has a weight of 20 to 80 g / m 2, preferably 20 to 60 g / m 2, It has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 1500 g / m 2 in 24 hours, preferably at least 3000 g / m 2 in 24 hours.

  According to a further embodiment, the elastic web material is at least 30%, preferably at least 50%, most preferably at least at least the elastic modulus of the elastic laminate, as measured by the elastic test specified herein. Has an elastic modulus in the transverse direction of the article of 70%.

  In one aspect of the invention, the elastic web material has a basis weight of less than 100 g / m2, preferably less than 90 g / m2.

It is a perspective view of a pants type diaper. It is a top view of the underpants type diaper of the state before the shaping | molding when seen from the side which faces a body in the flat and fully expanded state. It is a top view corresponding when it sees from the outer side on the opposite side of a pants type diaper. It is sectional drawing according to the VI-VI line in FIG. It is sectional drawing of the elastic laminated body according to the VII-VII line in FIG.

  The present invention will be described in more detail below by way of example and with reference to the accompanying drawings.

  The present invention is described in detail below with reference to several embodiments illustrated in the accompanying drawings.

[Absorbent articles]
The term “absorbent article” means a product that is placed against the wearer's skin and absorbs and retains body exudates such as urine, feces and menstrual fluid. The present invention primarily relates to disposable absorbent articles, which means articles that are laundered or otherwise re-stored as absorbent articles after use or are not intended to be reused. ing. The present invention relates to a “pants-type absorbent article” having a core region and a main body region surrounding the core region. Examples of such pants-type absorbent articles are pants-type diapers, sanitary pants, and incontinence pants.

  The drawing shows an embodiment of a pant diaper 1 for an infant or an incontinent adult. The pant diaper typically includes an absorbent core 2 disposed in an absorbent assembly 3 of the article. The diaper further includes a main body 4. The main body includes a front part 5 and a rear part 6. The article may include a waist band 17 having elasticity.

  The article has a longitudinal direction y and a transverse direction x.

  The absorbent assembly 3 includes a liquid permeable top sheet 20 and a liquid impermeable back sheet 19. The absorptive core 2 is enclosed between the top sheet 20 and the back sheet 19 (FIG. 4).

[Top sheet]
The liquid-permeable top sheet 20 can be made of a nonwoven material such as spunbond, meltblown, carded, hydroentangled, or wet. Suitable nonwoven materials can be composed of natural fibers such as pulp or cotton fibers, artificial fibers such as polyester, polyethylene, polypropylene, viscose, or a mixture of natural and artificial fibers. Furthermore, the material of the top sheet can be composed of two fibers and can be bonded together in a bonding pattern such as disclosed in US Pat. Further examples of top sheet materials are porous foam, perforated plastic films, and the like. Materials suitable as material for the top surface sheet should be soft and non-irritating to the skin and are intended to be easily permeable by body fluids such as urine or menstrual fluid. The top sheet may be different in different parts of the absorbent article.

[Back sheet]
The liquid-impermeable back sheet 19 provided in the absorbent assembly 3 on the side facing the wearing of the absorbent core 2 is a thin plastic film, for example a polyethylene film or a polypropylene film, and has a liquid impermeability. It consists of a liquid-impermeable material, such as a material-coated nonwoven, a hydrophobic nonwoven that is resistant to liquid penetration, or a laminate comprising a plastic film and a nonwoven. Yes. The backsheet 19 can be breathable so that water vapor can escape from the absorbent core while preventing liquid from passing through. Examples of breathable backsheet materials are porous polymer films, nonwoven laminates composed of spunbond and meltblown layers, laminates composed of porous polymer films, and nonwoven materials. The back sheet 19 is preferably inelastic.

[Web material with elasticity]
At least one of the front part 5 and the rear part 6 of the main body 4 includes a web material 10 having elasticity. Preferably, both the front part 5 and the rear part 6 comprise an elastic web material 10. The elastic modulus in the x direction of the elastic web material 10 should be at least 30%, preferably at least 50%, more preferably at least 70% as measured by the elastic modulus test specified below.

  Preferably, the web material 10 having elasticity is also elastic in the y direction of the article. However, the elastic modulus in the y direction is preferably lower than in the x direction. The modulus of elasticity in the y direction should be at least 20%.

  In the embodiment shown and described herein, the elastic web material comprises first and second outer layers of fibrous materials 11 and 12, and a central elastic film layer 13 disposed between the fibrous layers. This is an elastic laminate 10 (see FIG. 5).

  However, it is understood that other types of elastic web materials can be used, such as elastic nonwovens, essentially non-elastic but elasticized with elastic yarns and the like. The elastic web material can also comprise one layer or two or more layers laminated.

In the elastic laminate shown and described herein, the outer fiber layers 11 and 12 are preferably selected so that the material has a high breaking strength in combination with the inner elastic film layer 13. The outer fiber layers 11 and 12 are soft and give a cloth-like feel to the laminate. Examples of preferred materials are carded webs and spunbond materials. The basis weight of the fiber layer should be 10 to 35 g / m 2, preferably 12 to 30 g / m 2, more preferably 10 to 25 g / m 2. Examples of suitable polymers used in the fiber material are polyethylene, polyester, polypropylene, and other polyolefin homopolymers and copolymers. Natural fibers such as cotton can also be used as long as they provide the required properties. The blend of polymers can contribute to the high flexibility of the nonwoven layer, thereby imparting the nonwoven with a high elongation at maximum load. A mixture of polyethylene polymer and polypropylene polymer proved to give good results in this respect.
Mixtures of fibers composed of different polymers are also possible.

  According to one embodiment of the invention, the central layer 13 is a perforated elastic film having a weight of 20-80 g / m 2, preferably 20-60 g / m 2. The film may be any suitable elastic polymer and may be a natural polymer or a synthetic polymer. Some examples of materials suitable for elastic films are low crystalline polyethylene, metallocene-catalyzed low crystalline polyethylene, ethylene vinyl acetate copolymer (EVA), polyurethane, polyisoprene, butadiene-styrene copolymer, styrene / isoprene / styrene. (SIS), styrene block copolymers such as styrene / butadiene / styrene (SBS), or styrene / ethylene-butadiene / styrene block copolymers. Mixtures of these polymers and other modified or non-elastomer materials can also be used. One example of a suitable film is a perforated three-layer elastomer film made of PE-SEBS-PE.

  The total weight of the laminate is preferably 100 g / m 2 or less, more preferably less than 90 g / m 2.

  The elastic laminate 10 can be manufactured according to the method disclosed in Patent Document 2, in which one spunbond layer 11 is applied to the film 13 in an adhesive state, and thus adhered to the film layer. The spunbond layer 12 is adhesively laminated to the film layer 13 using, for example, a pressure-sensitive hot melt adhesive. Alternatively, the laminate is manufactured in accordance with a variant of this known method, where the variant is a fixed amount up to a point below the elongation at least one maximum load of the inelastic nonwoven layer. Stretching (by intermeshing gears (IMG)) and holding a predetermined strength against at least one of the nonwoven layers. The other layer can also be stretched to the point as elongation at maximum load or to break during stretching.

  The method disclosed in U.S. Pat. No. 6,057,836 involves stretching the laminate over the yield point of the fiber material, so that the inelastic layer is completely broken. Therefore, as described in Patent Document 2, the extension of the laminate is not limited by the stretch elastic modulus of the inelastic material.

  In a preferred embodiment, at least one, preferably both fiber layers, which are adhered to the elastic film, are completely in the production of the laminate according to the invention (in contrast to the method described in US Pat. It will not be torn. Selection of a fiber material having an elongation at maximum load that is greater than the elastic modulus of the elastic laminate allows the elastic film to extend without being disturbed by the fiber layer. Such a selection also ensures that the fiber layer contributes to the breaking strength of the laminate, since the fiber layer is not completely broken or broken during manufacture. Preferably, both fiber layers, or at least one of the fiber layers, has an elongation at maximum load that is at least 10% higher than the elastic modulus of the laminate. This is described in more detail in the international application PCT / SE2004 / 001005, which is hereby incorporated by reference. The opacity of a layer of material is the characteristic ability of a layer of material to visually hide the appearance of underlying objects or patterns. Opacity is measured in%, 100% opacity means nothing is visible through the layer of material, 0% opacity means that the layer of material is completely transparent . The opacity is measured by an opacity test described later, and is based on luminous reflectance data.

  The opacity of the laminate can be obtained by incorporating an opacifying filler in the laminate, particularly in the elastic film. Such pigments can be organic or inorganic dyes, colorants, or whitening agents. Inorganics such as titanium dioxide, inorganic carbonates, synthetic carbonates, talc, nepheline syenite, magnesium hydroxide, triatohydrate of siatomaceous earth aluminum, mica, natural or synthetic silica, calcined Clay and mixtures of these materials are preferred examples of opacifying fillers.

  The filler is preferably added as a major batch in the extrusion of the film. One example of a suitable concentration is about 5% filler by weight of the film.

  It is further preferred that the elastic laminate 10 has a breathability (water vapor transmission rate) according to ASTM E96-00 Method D of at least 1500 g / m 2 per 24 hours, preferably at least 3000 g / m 2 per 24 hours. .

  The open area of the elastic film layer is preferably at least 5%, more preferably at least 8%. The open area is measured by image analysis and is defined as the sum of the hole area divided by the total area of the film specimen.

[Absorbent core]
An “absorbent core” is an absorbent structure disposed in an absorbent assembly of an absorbent article. The absorbent core 2 can be of any conventional type. Examples of commonly used absorbent materials are cellulose fluff pulp, tissue layers, highly absorbent polymers (so-called superabsorbents), absorbent foam materials, absorbent nonwoven materials, or the like. . It is common to combine cellulose fluff pulp with a superabsorbent polymer in an absorbent core. The superabsorbent polymer is a water-swellable organic or inorganic substance, or a water-insoluble organic or inorganic substance, and can absorb at least about 20 times its weight, and 0.9% by weight of sodium chloride in an aqueous solution. Contains. Organic materials suitable for use as a superabsorbent material include natural materials such as polysaccharides, polypeptides, and the like, and synthetic materials such as synthetic hydrogel polymers. Such hydrogel polymers include, for example, alkali metal salts of polyacrylic acid, polyacrylamide, polyvinyl alcohol, polyacrylate, polyacrylamide, polyvinyl pyridine, and the like. Another suitable polymer includes hydrolyzed acrylonitrile graft starch, acrylic acid graft starch, and isobutylene maleic anhydride copolymer and mixtures of these materials. The hydrogel polymer is preferably lightly crosslinked, making the material substantially water insoluble. Preferred superabsorbent materials are further surface crosslinked, and the outer surface or outer shell of superabsorbent particles, fibers, flakes, spheres, etc. has a higher crosslink density than the interior of the superabsorbent. ing. Superabsorbent materials can be in any form suitable for use in absorbent composites, including particles, fibers, flakes, spheres, and the like.

  High absorption capacity is provided by the use of large amounts of superabsorbent material. For absorbent cores comprising a matrix of hydrophilic fibers, such as cellulose fibers and superabsorbent materials, the proportion of superabsorbent material is preferably 10 to 90% by weight, more preferably It is 30 to 70% by weight.

  In absorbent articles, it has been conventional to have an absorbent core with layers having different properties for liquid storage capacity, liquid dispersion capacity, and liquid storage capacity. Thin absorbent bodies, which are common, for example in baby diapers and incontinence guards, often have a compressed mixed or layered structure of cellulose fluff pulp and superabsorbent polymer. The size and capacity of the absorbent core can be varied to suit different uses, such as for infants or for adult incontinent persons.

  The absorbent core is further disposed on the top surface of the main absorbent body and further includes a capture dispersion layer that quickly stores and temporarily stores the discharged liquid before being absorbed by the main absorbent core. Also good. Such acquisition and dispersion layers are well known in the prior art and can be composed of porous fiber stuffing or foam materials.

[Pants type diapers]
The pant diaper disclosed in FIG. 1 is intended to surround the lower part of the wearer's torso like a pair of underwear. The pant diaper includes an absorbent assembly 3 and a body 4. The main body 4 includes a front part 5 and a rear part 6. The front part 5 and the rear part 6 are coupled to each other along opposite side edges in the longitudinal direction by ultrasonic fusion, glue string, or the like, Leg openings.

  At least one of the front part 5 and the rear part 6, preferably both, includes the elastic web member 10 as described above. The absorbent assembly 3 is disposed at least in the crotch portion 7 and has a predetermined distance superimposed on both the front portion 5 and the rear portion 6, and the article has a longitudinal direction (y) and a lateral direction (x). ing.

  The article 4 further includes a crotch portion 7 disposed between the front part 5 and the rear part 6 in the longitudinal direction of the article. The front portion 5 has a predetermined length b1 in the longitudinal direction, the rear portion 6 has a predetermined length b3 in the longitudinal direction, and the crotch portion 7 has a predetermined length b2 in the longitudinal direction.

  Thus, as shown in FIG. 2, the article is divided into three parts (front part, rear part, and crotch part) in the longitudinal direction. The front part is the point where the angle of the waist edge of the article, the side edge in the longitudinal direction of the article, a part of the leg opening of the article, and the edge of the leg opening changes most extreme (i.e. A partition is defined by a horizontal line arranged at a point where the rate of change in the angle of the edge of the leg opening is the largest with respect to the horizontal direction. In the same way, the rear part of the waist of the article, the side edge in the longitudinal direction of the article, a part of the leg opening of the article, and the leg opening where the angle of the edge changes most extreme A partition is defined by a line in the horizontal direction arranged at a point on the end side (that is, a point at which the rate of change in the angle of the end side of the leg opening is the largest with respect to the horizontal direction). The crotch portion is demarcated by the edge of the leg opening of the article at the end in the longitudinal direction, and delimited by the two lateral lines described above at the end in the lateral direction. .

  It is important that the front / rear elastic material allows bending and stretching during use of the article. When a non-elastic layer is bonded to this elastic web material, the flexibility and spreadability of the elastic web material is reduced. According to the present invention, the absorbent assembly 3 overlaps less than 20%, preferably less than 10%, of the front and rear surface areas as measured in the stretched state of the article. The “stretched state” of an article is used in this specification to refer to any elastic material contained in the absorbent assembly, such as elastic web material, waist elastic material, and leg elastic material, gathering any part of the product. The article is defined as being stretched in all four directions to the extent that the entire product is completely flat. The article is stretched only until it reaches this flat state.

  In another embodiment of the present invention, the article is defined by a front half 14 defined by the edge of the article and the lateral centerline 16 of the article, and by the edge of the article and the lateral centerline 16 of the article. And a defined second half 15. The surface area of the first half portion 14 is 80-90% of the surface area of the second half portion 15 when measured in the extended state of the article. This provides a more pant-like shape for the absorbent article.

  In a further embodiment, the article has a maximum width (c) in the transverse direction, a maximum length (b) in the longitudinal direction, and a maximum length (b) of the maximum width (c) of the article. The ratio to is 80% to 120%, preferably 90% to 110%, as measured in the extended state of the article. According to a preferred embodiment, the ratio (b1 / c) of the front length (b1) of the article to the width (c) is 25% to 35% when measured in the extended state of the article. , Preferably 28% to 32%. Further, the ratio (b3 / c) of the length (b3) of the rear part of the article to the width (c) is 38% to 52% when measured with the article extended. Articles that match these measurements provide a more pant-like shape and a better fit for absorbent articles.

  In order to provide a good fit and safety against leakage, the length (b2) of the crotch portion 7 is the total length of the article (b) when measured with the article extended. It is 10 to 40%, preferably 20 to 40%, most preferably 25 to 35%.

  The crotch portion 7 is provided with a crotch portion panel material 21 provided on the side facing the clothing under the absorbent assembly. According to one embodiment of the present invention, the crotch portion panel material 21 includes the substantially inelastic web material 18, but an elastic material may be used. Preferably, the inelastic web material 18 is a non-woven material. The substantially inelastic web material 18 is disposed in the crotch portion of the article and is joined to the elastic web material 10 at or near the boundary between the crotch portion 7 and the front portion 5 and the rear portion 6. The inelastic web material 18 can therefore be arranged between these parts in the longitudinal direction of the article. The non-elastic web material 18 can fully overlap the front part 5 and the rear part 6 and can be bonded to these parts, but the non-elastic web material 18 has a front part over most of its surface. There is no significant overlap with 5 or rear 6.

  According to one embodiment of the present invention, both the front and rear portions comprise an elastic web material 10, the crotch portion 7 has substantially no elastic web material, and the length (b2) of the crotch portion 7 is , Substantially equal to the distance between the panels of elastic web material 10 at the front part 5 and the rear part 6. However, the boundary between the front part 5 and the rear part 6 and the crotch part 7 may or may not coincide with the joint between the different panel members 10 and 21. Thus, the joint between different panel materials may extend over any of the front, rear, or crotch portions.

  The inelastic web material of the crotch portion 7 can be bonded to the elastic web material 10 of the front part 5 / rear part 6, and the inelastic web material of the crotch part 7 is held in a selectively stretched state, and thus The gathers are provided on the non-elastic web material of the seams 8, 9 at the front and rear crotch portions. The gathers act to pull the pant-type absorbent article into the required shape, thus providing a better fit while also providing the article with a more pant-like appearance.

  In another embodiment, no separate crotch panel material 21 is provided, but the elastic web material 10 is also present under the absorbent assembly 3 in the crotch part of the article. Alternatively, only the absorbent assembly 3 bridges the front part 5 and the rear part 6.

  The absorbent assembly 3 according to the present invention comprises a liquid-impermeable back sheet layer 19, a liquid-permeable top sheet layer 20, and an absorbent core 2 encapsulated between these sheet layers, all these components Has been described above. The absorbent assembly 3 may be bonded to the front 5 / rear 6 elastic web material 10 and is held in a selectively stretched state, so that the gathers are absorbed into the absorbent assembly. It is provided at a point connected to the front part 5 and the rear part 6.

  The pants-type absorbent article according to the present invention can include an elastic waist band 17 made of an elastic member fixed to the front part and the rear part. In an alternative embodiment, only one of the front part 5 and the rear part 6 has an elastic waistband 17 secured thereto. Further, the elastic waist band portions 17 fixed to the front portion 5 and the rear portion 6 can be coupled to each other along the side seam.

  When using the elastic web material 10 according to the invention, no additional elasticized sides connecting the front part 5 and the rear part 6 are required. If desired, additional elasticized sides may, of course, be provided, especially if the elastic web material 10 is only arranged on a part of the front and / or rear.

  As mentioned above, the elastic web material 10 has an opacity of at least 40%, preferably at least 50%, more preferably at least 60%. The impermeability of the elastic web material gives the article a cloth-like appearance, which is particularly important when the article is a pant diaper. Particularly in this case, where the elastic web material forms a unitary component of most surface area of the pant diaper, such as large areas of the front and rear, and the absorbent core is 30% or less of the article. The appearance of the elastic web material is very important to the overall appearance of the article, covering only a relatively small area of less. Thus, by allowing the elastic web material to have an opacity of at least 40%, the pant diaper is more cloth-like than if the elastic web material has a high degree of transparency and “normal” “Looks like underwear. The opacity is measured by the opacity test disclosed in the international patent application PCT / SE2004 / 001415.

  It is further desirable that the elastic web material has a breaking strength of at least 15N when measured in accordance with ASTM No. D3763-02. Preferably, the elastic web material of the present invention has a breaking strength of at least 20N, more preferably at least 30N.

  The elastic web material should have at least 20, preferably at least 30, more preferably at least 40 soft buttery softness. It is further preferred that the elastic web material has a formability of less than 50, preferably less than 30, more preferably less than 20, most preferably less than 10. Moreover, it is desirable that the elastic web material has a drape suitability of less than 40 cotton butterflies. Softness, moldability, and drape suitability by Kawabata are measured according to the test methods given in the international patent application PCT / SE2004 / 001004.

[Elasticity test]
This method measures how the elastic material behaves during repeated loading and unloading. The sample is stretched to a predetermined elongation and a periodic movement between 0 and the predetermined elongation is performed. The desired unloading force is recorded. The permanent elongation of the relaxed material, i.e. the residual elongation, is measured.

  A tensile tester Lloyd LRX (Lloyd LRX) equipped with a printer / plotter or software is used. The sample is prepared by cutting to a width of 25 mm and a length that is preferably 20 mm longer than the distance between the clamps of the tensile tester.

The tensile tester is calibrated according to the instructions for use of the device. The parameters required for the test (addition and removal force) are adjusted as follows.
-Crosshead speed: 500 mm / min
-Clamping distance: 50 mm
-Preload: 0.05 N

  The sample is placed according to the landmarks during clamping and it is verified that the sample is centered and fixed vertically in the clamping. The tensile tester is activated and three cycles between 0 and a predetermined elongation equal to the highest defined first load are performed. Prior to the last cycle, the sample is allowed to relax for 1 minute, then the permanent elongation is measured by stretching the sample until a 0.1 N force is detected and reading the elongation.

  The permanent elongation after relaxation should be 10% or less and is measured by the method described above. Thus, 30% elasticity is defined to have a permanent relaxation after elongation of less than 10% after being subjected to 30% elongation in the tensile tester described above. An elongation of 30% means an elongation to a length that is 30% longer than the original length of the sample.

[Size]
Some embodiments of the articles of the present invention have the following dimensions and relative dimensions.

  The overlap on the front / rear of the absorbent assembly is as follows.

  Although the invention has been described with reference to the preferred embodiments, it will be understood that various modifications are possible within the scope of the claims. Accordingly, the present invention is intended to embrace all such variations or equivalents that are known or conventional within the skill of the art to which this invention belongs.

DESCRIPTION OF SYMBOLS 1 ... Pants type absorbent article 2 ... Absorbent core 3 ... Absorbent assembly 4 ... Main body 5 ... Front part 6 ... Rear part 7 ... Crotch part 10 ... Elasticity Web material 11 ... first layer 12 ... second layer 13 ... elastic film layer 14 ... first half part 15 ... second half part 16 ... center line 18 ... inelastic Web material 19 ... back sheet layer 20 ... top sheet layer 21 ... crotch panel material b ... maximum length c ... maximum widths b1, b2, b3 ... length x ...・ Horizontal direction y ・ ・ ・ longitudinal direction

Claims (29)

Pant-type absorbent article (1), such as a pant diaper, sanitary pant or incontinence pant, the article comprising an absorbent core (2) and a body (4), an absorbent assembly 3) The main body (4) includes a front part (5) and a rear part (6), and the front part (5) and the rear part (6) are along two opposing longitudinal side edges. Are joined together to form a waist opening and a pair of leg openings, both the front part (5) and the rear part (6) comprising an elastic web material (10), the article (4 ) Further includes a crotch portion (7) disposed between the front portion (5) and the rear portion (6) in the longitudinal direction of the article, and the front portion (5) has a predetermined length in the longitudinal direction. (B1), the rear part (6) has a predetermined length (b3) in the longitudinal direction, and the crotch part (7) in the longitudinal direction. The absorbent assembly (3) is at least in the crotch portion (7) and has a predetermined length in both the front portion (5) and the rear portion (6). The article has a maximum width (c) in the transverse direction and a maximum length (b) in the longitudinal direction, the article having a longitudinal direction (y) and a transverse direction (x). Have
The absorbent assembly only overlaps less than 20% of the surface area of each of the front and rear portions in the extended state of the article;
The ratio of the maximum width (c) of the article to the maximum length (b) is between 90% and 110% when measured in the extended state of the article, and the front of the article The ratio of length (b1) to the maximum width (c) is 25% to 35% when measured in the stretched state of the article, and the length of the rear part (b3) of the article The ratio to the maximum width (c) is 38% to 52% when measured in the extended state of the article,
The article comprises a front half (14) defined by an edge of the article and a lateral center line (16) of the article, an edge of the article and a lateral center line (16) of the article. And the surface area of the front half (14) is determined by the surface area of the rear half (15) when measured in the extended state of the article. 80-90% der is,
A pants-type absorbent article (1), wherein the crotch portion (7) is free of the elastic web material .   The ratio of the length (b1) of the front portion of the article to the maximum width (c) is 28% to 32% when measured in the extended state of the article. The underpants type absorbent article (1) according to 1.   The length (b2) of the crotch portion (7) is 10 to 40% of the entire length (b) of the article when measured with the article extended. The underpants type absorbent article (1) according to claim 1 or 2.   The length (b2) of the crotch portion (7) is 20 to 40% of the entire length (b) of the article when measured with the article extended. The underpants type absorbent article (1) according to claim 3.   The length (b2) of the crotch portion (7) is 25 to 35% of the entire length (b) of the article when measured with the article extended. The underpants type absorbent article (1) according to claim 4.   Both said front part (5) and said rear part (6) are equipped with the said elastic web material (10), The underpants type absorbent article as described in any one of Claims 1-5 characterized by the above-mentioned. (1). Before Kiko portion length of (7) (b2) are characterized by substantially equal to the distance between the panel made of an elastic web material (10) of said front (5) and the rear (6) The pants-type absorbent article (1) according to any one of claims 2 to 6.   The absorbent assembly (3) includes a liquid-impermeable back sheet layer (19), a liquid-permeable top sheet layer (20), and a back sheet layer (19) and a top sheet layer (20). The pants-type absorbent article according to any one of claims 1 to 7, further comprising an absorbent core (2) enclosed therebetween.   9. The crotch portion (7), comprising a crotch panel material (21) on the side facing the garment under the absorbent assembly (3). The pants-type absorbent article described in 1.   The pants-type absorbent article according to claim 9, wherein the crotch panel material (21) is an inelastic web material (18).   The pant-type absorbent article according to claim 10, wherein the inelastic web material (18) is a non-woven material.   The elastic web material is a laminate comprising first and second layers (11, 12) made of fiber layers and an elastic film layer (13) disposed between the first and second layers. It is 10), The underpants type absorbent article as described in any one of Claims 1-11 characterized by the above-mentioned.   The pants-type absorbent article according to claim 12, wherein the elastic film layer (13) has air permeability. The pant-type according to claim 13, characterized in that the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 1500 g / m ^{2 in} 24 hours. Absorbent article. 15. The pant mold according to claim 14, wherein the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 3000 g / m ^{2 in} 24 hours. Absorbent article. The elastic laminate (10) comprises first and second fiber layers (11, 12) made of spunbond material, each of these layers having a weight of 10-35 g / m ² and breathable. The elastic film layer (13) having a weight of 20-80 g / m ^{2 and} the elastic laminate (10) is at least 1500 g / m ^{2 in} 24 hours, ASTM E-96-00 Method D The pants-type absorbent article according to claim 12, which has a water vapor transmission rate according to claim 12. The pant-type absorption according to claim 16, characterized in that the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 3000 g / m ^{2 in} 24 hours. Sex goods. Elastic film layer having a permeability (13), pant-type absorbent article of claim 16, wherein the has a basis weight of 20 to 60 g / m ^2. The pant-type absorption according to claim 18, characterized in that the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 3000 g / m ^{2 in} 24 hours. Sex goods. The first and second fiber layers (11, 12) made of the spunbond material have a basis weight of 12-30 g / m ² , and the elastic film layer (13) having air permeability is 20-80 g / m. ^The elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 1500 g / m ^{2 in} 24 hours. Item 17. A pant-type absorbent article according to Item 16. Elastic film layer having a permeability (13), pant-type absorbent article of claim 20, wherein a has a basis weight of 20 to 60 g / m ^2. 21. Pants-type absorption according to claim 20, characterized in that the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 3000 g / m < ² > in 24 hours. Sex goods. The pant-type absorption according to claim 21, characterized in that the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 3000 g / m ^{2 in} 24 hours. Sex goods. The first and second fiber layers (11, 12) made of the spunbond material have a weight of 15 to 25 g / m ² , and the elastic film layer (13) having air permeability is 20 to 80 g / m. ^The elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 1500 g / m ^{2 in} 24 hours. Item 17. A pant-type absorbent article according to Item 16. 25. The pants-type absorbent article according to claim 24, wherein the breathable elastic film layer (13) has a weight of 20 to 60 g / m < ² >. 25. Pants-type absorption according to claim 24, characterized in that the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 3000 g / m < ² > in 24 hours. Sex goods. 26. Pant-type absorption according to claim 25, characterized in that the elastic laminate (10) has a water vapor transmission rate according to ASTM, E-96-00 Method D of at least 3000 g / m < ² > in 24 hours. Sex goods. It said elastic web material (10) is pant-type absorbent article according to any one of claims 1 to 27, characterized in that it has a basis weight of less than 100 g / m ^2. 29. The pant-type absorbent article according to claim 28, wherein the elastic web material (10) has a basis weight of less than 90 g / m < ² >.

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