CN112261924A

CN112261924A - Disposable absorbent articles

Info

Publication number: CN112261924A
Application number: CN201880092848.8A
Authority: CN
Inventors: 王波; 郭海英; 杨帆; 张文锦; 刘伟安; 黄睿; 陈长翼; 邵忠峰; 方志发; 原源; 吴慧敏; 赵肖; 王艺姝; 刘绮杏
Original assignee: Vinda Paper China Co Ltd
Current assignee: Vinda Paper China Co Ltd
Priority date: 2018-07-06
Filing date: 2018-12-24
Publication date: 2021-01-22
Also published as: SG11202013195QA; WO2020006996A1; CN208974339U; MY203307A

Abstract

A disposable absorbent article (1) comprising a front waist region (11), a rear waist region (12) and a crotch region (13) therebetween, wherein both side edges (111) of the front waist region (11) and both side edges (121) of the rear waist region (12) are joined to form a waist opening (14), respectively, and both side edges of the crotch region (13) extend to the front waist region (11) and the rear waist region (12), respectively, to form a pair of leg openings (15). The front waist region (11) and/or the rear waist region (12) is provided with at least one stretchable region provided as a multilayer composite structure capable of elastically stretching in at least a transverse direction. The multilayer composite structure comprises at least one layer of high polymer elastic membrane (163) compounded with at least one layer of non-woven fabric layer (161, 162), and at least one layer of the multilayer composite structure is provided with a plurality of air holes. The waistline area of the multilayer composite structure has uniform elasticity, good extensibility and fitting degree, comfortable wearing and good air permeability.

Description

Disposable moisture absorption article

Technical Field

The present invention relates generally to the field of sanitary articles, and more particularly to a disposable absorbent article.

Background

The disposable absorbent articles on the market are mainly divided into pant-type absorbent articles and strip-sheet-type absorbent articles, and the pant-type absorbent articles have the advantages of convenience in use, leakage prevention and the like, and are popular among consumers in recent years. Such an absorbent article comprises a front waistline region, a rear waistline region and a crotch region disposed therebetween, wherein side edges of the front waistline region and side edges of the rear waistline region are connected, both ends of the crotch region are connected to a bottom end of the front waistline region and a bottom end of the rear waistline region, respectively, and further, an absorbent main body is provided on a skin side of the crotch region. However, the current products or designs still do not achieve satisfactory comfort levels.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems of the prior art and providing a disposable absorbent article having a waist region with uniform elasticity, good extensibility and fit, comfortable wearing, and good breathability.

To this end, according to the present invention, there is provided a disposable absorbent article comprising a front waistline region, a rear waistline region and a crotch region between the front and rear waistline regions, wherein both sides of the front and rear waistline regions are joined to form a waistline opening, respectively, and both sides of the crotch region extend to the front and rear waistline regions to form a pair of leg openings; wherein the front waistline region and/or the rear waistline region is provided with at least one telescopic region which is arranged into a multilayer composite structure capable of elastically stretching along at least a transverse direction; the multilayer composite structure comprises at least one layer of high polymer elastic membrane compounded with at least one layer of non-woven fabric layer, and at least one layer of the multilayer composite structure is provided with a plurality of air holes.

The present invention may further include any one or more of the following alternatives according to the above technical idea.

In certain alternative forms, the multilayer composite structure is disposed in the entire transverse direction of the front and rear waist regions, and includes a first nonwoven layer, a second nonwoven layer, and a polymeric elastic film laminated between the first and second nonwoven layers, and the plurality of ventilation holes penetrate the multilayer composite structure.

In some alternatives, the first nonwoven layer, the polymeric elastic film, and the second nonwoven layer are combined by ultrasonic welding, and the plurality of vent holes are formed at the ultrasonic welding points.

In certain alternative forms, the porosity of the plurality of pores in the multilayer composite structure is greater than 0.5%, preferably from 1% to 25%, more preferably from 2% to 10%, more preferably from 3% to 5%, more preferably from 3.5% to 4.5%.

In certain alternatives, the elastic film does not extend to the ends of the front and back waist regions, which include at least one strand of elastomer composited between the first and second nonwoven layers and extending in the transverse direction.

In certain alternatives, the first nonwoven layer extends in the front waist region, the back waist region and the crotch region, and the elastic film and the second nonwoven layer extend in the front waist region and the back waist region.

In some alternatives, the first nonwoven layer extends beyond the elastic film and the second nonwoven layer and is folded over inwardly over the second nonwoven layer at the end of the waist opening.

In certain alternatives, the second nonwoven layer extends from the rear waist region to a portion of the crotch region, and at least one elastic body extending arcuately in the transverse direction is compounded between the first and second nonwoven layers without an elastic film.

In some alternatives, the stretch zone is configured to have a stretch ratio that continuously increases from the crotch region toward the waist-opening.

In some optional forms, the expansion and contraction rate of the expansion and contraction area is 1.2-8.

In certain alternatives, the stretchable region has an elastomer content of 5% to 100%, a denier of 20 to 1240dtex, and a basis weight of 20 to 200 gsm.

In certain alternatives, the elastic film is continuously or intermittently composited with at least one nonwoven layer.

In some alternatives, the disposable diaper further comprises an absorbent main body extending from the crotch region to the front and rear waist regions, wherein the absorbent main body is provided with a containment at both side edges, and the side edges of the containment are folded inward and covered with at least one elastic body extending in the longitudinal direction to form a three-dimensional containment.

In certain alternative forms, the ends of the absorbent main body in the longitudinal direction are respectively covered with protective sheets.

Compared with the existing products, the disposable absorbent article of the present invention has at least the following advantages:

1. the front waistline region and/or the rear waistline region are/is provided with at least one telescopic region which can elastically stretch along at least the transverse direction, so that the size of the figure of a user and the activity of the user can be met, the telescopic region has uniform elasticity in the whole waistline region, is high in fit degree with a human body, is comfortable to wear, is attractive and elegant, and is not easy to produce symptoms such as strangulation, red swelling and the like.

2. The flexible area is a multi-layer composite structure formed by compounding at least one non-woven fabric layer and at least one high polymer elastic film layer, a plurality of air holes are formed in the flexible area, the air permeability is good, the comfort level is high, and symptoms such as eczema and pruritus generated by skin under the condition of sultry moisture are avoided.

Drawings

Other features and advantages of the present invention will be better understood by the following detailed description of alternative embodiments, taken in conjunction with the accompanying drawings, in which like characters represent the same or similar parts, and in which:

FIG. 1 is a schematic representation of a first embodiment of an absorbent article according to the present invention;

FIG. 2 is an expanded schematic view of the embodiment of FIG. 1, showing a partial cross-sectional configuration;

FIG. 3 is an enlarged schematic cross-sectional view of the front or back waist region of the embodiment shown in FIG. 1;

FIG. 4 is a schematic representation of a second embodiment of an absorbent article according to the present invention shown in partial cross-sectional configuration after deployment;

FIG. 5 is a schematic representation of a third embodiment of an absorbent article according to the present invention shown in partial cross-sectional configuration after deployment;

FIG. 6 is a schematic representation of a fourth embodiment of an absorbent article according to the present invention shown in partial cross-sectional configuration after deployment;

FIG. 7 is a schematic representation of a fifth embodiment of an absorbent article according to the present invention shown in partial cross-sectional configuration after deployment;

FIG. 8 is a schematic representation of a sixth embodiment of an absorbent article according to the present invention shown in partial cross-sectional configuration after deployment;

fig. 9 is a schematic representation of a seventh embodiment of an absorbent article according to the present invention shown in a partially cross-sectional configuration after deployment.

Detailed Description

The practice and use of the embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention. The description herein of the structural positions of the respective components, such as the directions of upper, lower, top, bottom, etc., is not absolute, but relative. When the respective components are arranged as shown in the drawings, these direction expressions are appropriate, but when the positions of the respective components in the drawings are changed, these direction expressions are changed accordingly.

As used herein, "front" refers to the side facing the abdomen of the human body, and "rear" refers to the side facing the back of the human body. "transverse direction" means along the waist circumference of the human body; "longitudinal direction" refers to a direction along the length of the human body, more specifically, a direction from one of the abdomen or back to the other through the crotch. "medial" refers to the side of the skin proximate to the body, and "lateral" refers to the opposite side away from the body. "side edges" refer to edges extending in the longitudinal direction and "end edges" refer to edges extending in the transverse direction.

As used herein, the term "disposable absorbent article" includes, but is not limited to, a pant-type sanitary napkin, a pant-type closed diaper, a toilet training pant, or an incontinence pant. Absorbent articles of this type each comprise a front waist region for engaging primarily the abdomen of a person, a rear waist region for engaging primarily the back of a person, and a crotch region between the front and rear waist regions, wherein the two sides of the front and rear waist regions are joined together to form a waist-opening, and the two sides of the crotch region extend into the front and rear waist regions and are joined together to form a pair of leg-openings. In addition, in the crotch region, the absorbent article further includes an absorbent main body disposed in the crotch region.

Herein, the "liquid-permeable top sheet" refers to a nonwoven fabric having heat-fusible fibers subjected to surface hydrophilic treatment and having permeability to liquid, and includes a liquid-permeable top sheet and a liquid-permeable flow-guiding sheet. "liquid impermeable backsheet" refers to a breathable film layer, a cast film layer, or a composite backsheet layer of a breathable film and a nonwoven fabric that is used in absorbent articles to block the outward penetration of liquids.

In disposable absorbent articles, in order to improve the fit to the surface of the human body, stretchability is generally imparted to appropriate portions such as leg circumferences and waist circumferences. As a method for imparting waist stretchability, the following three methods can be employed:

1. a method of horizontally arranging and fixing a plurality of elongated elastic members such as rubber strings in a state of being elongated in the transverse direction;

2. a method of placing and fixing an elastic film on a region elongated in the transverse direction;

3. a method of placing and securing an elastic nonwoven in a region elongated in the cross direction.

The above methods can provide a waist stretchability to a satisfactory degree. However, in the method 1, the rubber ribs are adopted, so that the elasticity is not uniformly distributed in the waistline area, and the rubber ribs are tight and are uncomfortable to feel when the device is used.

Methods

2 and 3 also fail to provide stretchability in the entire waist region, but provide stretchability in partial regions such as only both side waist regions or the front and rear waist regions, and the stretchability is not uniform over the entire waist surface.

In order to further improve the comfort of the absorbent article, the present invention is advantageously provided with at least one stretchable region in the front waist region and/or the rear waist region, the stretchable region being provided as a multi-layer composite structure capable of elastically stretching in at least a transverse direction, the multi-layer composite structure comprising at least one polymeric elastic film laminated with at least one nonwoven fabric layer, and at least one of the layers of the multi-layer composite structure being provided with a plurality of ventilation holes. Therefore, the elastic waist band has the advantages of uniform elasticity, comfortable fit, size adjustment, dryness, ventilation and the like. It should be understood, however, that deformation of the telescoping region in other directions (e.g., longitudinal or oblique orientation, etc.) is not precluded.

The polymeric elastomeric film may be any conventional single or multi-component polymeric polymer, including, but not limited to, polyethylene, polypropylene, polycarbonate, polyvinyl chloride, polystyrene, polyurethane, and combinations thereof.

As an example, the plurality of stretch regions may be arranged on the front waist region and/or the rear waist region in the form of a circle, a rectangle, or a polygon.

In various embodiments, the stretchable zone may also be integrally formed with the front waistline region and/or the rear waistline region.

In some embodiments, the multi-layer composite structure of the stretchable region is disposed in the entire transverse direction of the front and rear waist regions, and is compounded of a first (outer) nonwoven layer, a second (inner) nonwoven layer, and a polymeric elastic film disposed between the two layers. Alternatively, the multi-layer composite structure may also be formed by combining a non-woven fabric layer and a high polymer elastic film, wherein the non-woven fabric layer or the high polymer elastic film is configured to be close to the skin side of the human body. The non-woven fabric layer is of a single-component or multi-component single-layer or multi-layer composite structure, the fineness is 0.1-7 dtex, the unit area gram weight is 5-60 gsm, and 10 gsm-25 gsm is preferred. The elastic body content of the high-molecular polymer elastic film is 5-100%, the fineness is 20-1240 dtex, and the unit area gram weight is 20-200 gsm. In addition, the process of combining the polymeric elastic film with the nonwoven layer includes, but is not limited to, adhesive bonding, ultrasonic welding, hot melt lamination, mechanical bonding, combinations thereof, and the like.

In some embodiments, the stretch ratio of the stretch region is preferably 1.2 to 8, more preferably 1.5 to 4. The stretch ratio refers to the ratio of the transverse width of the stretch region in the ultimate stretched state to the transverse width in the unstretched state. Alternatively, the stretchable region is provided so as to have a stretch ratio that continuously increases from the crotch region toward the waist-opening, and by continuously changing in the stretching direction, the change in the amount of shrinkage becomes continuous, satisfying the need for the waist opening region to have a stronger contractive force than the crotch region.

In some embodiments, it is also conceivable to provide an elastic body or a belt-like stretchable nonwoven fabric in the waist opening area without changing the stretch ratio of the stretchable region, in order to satisfy the need for increasing the elasticity of the waist opening.

As mentioned above, the absorbent article of the present invention has good breathability properties both in the front and/or back waist regions themselves, as well as in the stretch region. Aiming at the telescopic area, at least one layer of the multilayer composite structure can be provided with a plurality of air holes, and the air holes are small holes visible to naked eyes or micro holes invisible to naked eyes, and the method comprises the step of uniformly arranging a plurality of air holes only on the high-molecular polymeric elastic film or uniformly arranging a plurality of air holes on the high-molecular polymeric elastic film and the non-woven fabric layer. Alternatively, the vent holes are arranged on the expansion area in a linear, zigzag or wavy manner. The high molecular polymer elastic film and at least one non-woven fabric layer are compounded through ultrasonic welding, and in the compounding stage, an ultrasonic welding device is in vibration contact with welding salient points on a bottom roller under the condition of high frequency (such as 20k Hz) and high speed, and the friction generates heat so that the high molecular polymer elastic film and the at least one non-woven fabric layer are fused and bonded. Wherein the welding bumps on the bottom roll correspond to the pattern shape (e.g., wave shape) of the vent holes formed at the ultrasonic welding points.

In some embodiments, the venting pores penetrate only through the polymeric elastic film and not through the nonwoven layer. In other embodiments, the gas permeable pores penetrate through the individual layers of the multilayer composite structure.

Optionally, the area of a single hole of the air holes uniformly distributed in the telescopic area or the multi-layer composite structure is 0.05-20 mm²Preferably 0.1 to 4mm²More preferably 0.2 to 1mm²More preferably 0.3 to 0.5mm². The number of the air holes per square meter in the stretching area or the multilayer composite structure in the ultimate stretching state, that is, the number of the salient points per square meter on the ultrasonic welding bottom roller, is 1000 to 150000, preferably 10000 to 130000, more preferably 60000 to 120000, and more preferably 95000 to 110000. The porosity is 0.5% or more, preferably 1% to 25%, more preferably 2% to 10%, more preferably 3% to 5%, more preferably 3.5% to 4.5%. The single pore area refers to the cross-sectional area of a single pore in the polymeric elastic film in the ultimate stretched state of the multi-layer composite structure. Porosity is the ratio of the sum of the cross-sectional areas of all the vents of the multilayer composite structure in the ultimate stretched state to the total area of the multilayer composite.

In some embodiments, the porosity of the uniformly arranged air-permeable pores on the stretchable region or the multi-layer composite structure is 0.5% to 1%. In other embodiments, the porosity of the uniformly arranged air-permeable pores in the expansion region or the multi-layer composite structure is 1% to 2%. In still other embodiments, the porosity of the uniformly arranged air-permeable pores in the expansion region or the multi-layer composite structure is 2% to 3%. In still other embodiments, the porosity of the uniformly arranged air-permeable pores in the expansion region or the multi-layer composite structure is 5% to 8%.

In one embodiment, the diameter of the single hole of the air holes on the telescopic area or the multi-layer composite structure is about 0.7mm, and the area of the single hole is about 0.385mm²The number of the air holes per square meter is about 103400.

In some embodiments, the distribution of the ventilation holes on the scalable multi-layer composite structure is not uniform, i.e., there are areas with dense ventilation holes and areas with sparse ventilation holes. In other embodiments, the vents are distributed only in a portion of the area of the scalable multi-layer composite structure.

It is to be understood that the limitations regarding the parameters of single pore area, porosity, elastomer content, grammage per unit area, elongation and fineness can be suitably changed according to actual needs, and are generally within the above-mentioned ranges. In addition, the elastic body may be any known elastic member, such as a rubber string, lycra yarn, spandex yarn, or the like.

The technical solutions of the alternative embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Fig. 1 to 3 show a first embodiment of an absorbent article according to the present invention. In this embodiment, the absorbent article is a pant-type sanitary napkin 1 comprising a front waist region 11, a rear waist region 12 and a crotch region 13 therebetween, wherein both side edges of the front waist region 11 and the rear waist region 12 are joined to form a waist-opening 14, respectively, for example, the transverse side edges 111 of the front waist region 11 and the transverse side edges 121 of the rear waist region 12 may be joined together by any suitable means such as ultrasonic welding, hot roll bonding, etc. Alternatively, quick detachment may be achieved by peeling the lateral side edges apart from each other after use of the absorbent article. In addition, the two side edges of the crotch region 13 extend to the front waistline region 11 and the rear waistline region 12, respectively, and are joined to each other to form a pair of leg openings 15, for example, in this embodiment, the crotch region 13 includes a front joining portion 131 and a rear joining portion 132 provided at both end portions, the front joining portion 131 is joined to the skin side of the front waistline region 11 with an adhesive, for example, and the rear joining portion 132 is joined to the skin side of the rear waistline region 12 with an adhesive, for example.

Fig. 2 is a schematic view of the unfolded structure of the pant-type sanitary napkin according to the present embodiment, and as shown in the drawing, the front waistline region 11, the crotch region 13, and the rear waistline region 12 after unfolding are in an "i" shape. The front waist region 11, the crotch region 13 and the back waist region 12 are three substantially independent components and are joined together during the manufacturing process. The multilayer composite structure is disposed in the entire transverse direction of the front waistline region 11 and the rear waistline region 12, and includes a first nonwoven layer 161, a second nonwoven layer 162, and an elastic film 163 combined between the first nonwoven layer 161 and the second nonwoven layer 162, as shown in fig. 3. Also, in a preferred embodiment, the plurality of vent holes penetrate the multilayer composite structure. The crotch region 13 is exemplified by a rectangular sheet shape having a liquid-permeable top sheet 133 provided on the skin side and a liquid-impermeable back sheet 134 provided on the outside. The absorbent main body 17 is provided in the crotch region 13, and in this embodiment, the absorbent main body includes an absorbent core 171 provided between a liquid-permeable top sheet 133 and a liquid-impermeable back sheet 134. The absorbent core 171 may be a super absorbent fibrous material bonded to the liquid-permeable top sheet 133 and the liquid-impermeable back sheet 134 of the crotch region 13, or an absorbent material provided so as to cover between the liquid-permeable core cover sheet and the liquid-impermeable core back sheet, the side edges of which are bonded to each other and to the liquid-permeable top sheet 133 and the liquid-impermeable back sheet 134 of the crotch region 13.

As can be seen from fig. 2, in this embodiment, the elastic film 163 does not extend to the ends of the front and rear waist regions, which include at least one strand of elastic 18, such as an elastic band, that is compounded between the first and second

nonwoven layers

161 and 162 and extends in the transverse direction. Wherein the first non-woven fabric layer and the second non-woven fabric layer are of single-component single-layer structures, the titer is 0.1-7 dtex, and the unit area gram weight is 10-60 gsm. The elastic film 163 has an elastomer content of 5 to 100%, a fineness of 20 to 1240dtex, and a unit area basis weight of 20 to 200 gsm. The flexible region can be 1.5 ~ 8 times along waistline direction elastic extension, and is the fold form under natural state, and then makes when dressing, and preceding waistline region 11 and back waistline region 12 have the even elastic flexibility of whole surface, can follow at least transverse direction and longitudinal direction elastic stretching and adjustment to natural shrinkage after the completion of dressing, make the trousers body laminate human skin top layer and do not have the sense of tightening.

It will be appreciated that the elastics 18 provided at the ends of the front and rear waist regions provide increased stretch to the waist opening to accommodate the user's desire for a snug fit of the pant. Also, in order to improve the comfort of the pant-type sanitary napkin, the leg hole openings may be provided with elastically contractible structures (not shown). For example, at least one elastic rubber band extending in the longitudinal direction and arranged side by side in the transverse direction is preferably provided at the leg hole opening. During preparation, the elastic rubber band is stretched according to a certain stretching proportion and is adhered to the opening edges of the waist opening and the leg opening through hot melting and gluing according to a preset radian and length, and the stretched elastic rubber band is recovered to a natural shrinkage state after molding, so that the waist opening and the leg opening are shrunk to form a wrinkle part, and body fluid leakage during use is prevented.

It should also be understood that the elastic film 163 may be drawn and stretched at a predetermined elongation rate and brought within an elastic recovery range during manufacture; then, two nonwoven fabric layers 161 and 162 having the same size are bonded to both sides of the elastic film 163, respectively, and are combined in an intermittent or continuous combination manner. After the completion of the lamination, the

nonwoven layers

161 and 162 are folded as the elastic film 163 recovers the elastic deformation in a non-stretched state. The interval compounding or continuous compounding can be hot rolling, chemical bonding or ultrasonic welding. Finally, physical perforation is performed on the front waistline region 11 and the back waistline region 12, and it is preferable that the pore sizes of the nonwoven layers on both sides and the elastic film 163 are kept uniform.

In a preferred embodiment, the

nonwoven layers

161, 162 and the elastic film 163 are laminated together using an ultrasonic welding process to form a multi-layer composite structure. And a ventilation hole penetrating the three-layer structure of the nonwoven fabric layer 161, the elastic film 163 and the nonwoven fabric layer 162 is formed at almost every ultrasonic welding point. The ultrasonic welding composite process is adopted, the telescopic composite structure does not contain glue, and the risk possibly brought to the body health of a user due to the fact that the glue is soaked and dissolved out by the waist sweat of the user and the like is reduced. The dense air holes formed in most or even all of the waist area greatly improve the air permeability of the waist area, reduce the possibility of sweat impregnation at the waist of the user, improve the comfort of the user and further reduce the risk of physical health of the user.

Optionally, the area of a single hole of the air holes uniformly distributed on the multilayer composite structure is 0.05-20 mm²Preferably 0.1 to 4mm²More preferably 0.2 to 1mm²More preferably 0.3 to 0.5mm². The number of the air holes per square meter in the stretching area or the multilayer composite structure in the ultimate stretching state, that is, the number of the salient points per square meter on the ultrasonic welding bottom roller, is 1000 to 150000, preferably 10000 to 130000, more preferably 60000 to 120000, and more preferably 95000 to 110000. The porosity is 0.5% or more, preferably 1% to 25%, more preferably 2% to 10%, more preferably 3% to 5%, more preferably 3.5% to 4.5%.

Fig. 4 shows a second embodiment according to the invention, in which a pant-type sanitary napkin 2 comprises a front waist region 21 and a rear waist region 22. The absorbent core 271 of the absorbent main body 27 is disposed between the liquid-permeable top sheet 233 and the liquid-impermeable back sheet 234 in the crotch region. The difference from the above embodiment is that: the belt-like fastener 222 is attached to the lateral side edge 221 of the back waistline region 22, and accordingly, the lateral side edge 211 of the front waistline region 21 may be provided with a connecting portion to which the belt-like fastener 222 is fittingly connected, and the belt-like fastener 222 and the connecting portion may be fixedly connected when worn, without joining the lateral side edge 211 of the front waistline region 21 and the lateral side edge 221 of the back waistline region 22 to each other. The connection between the band-shaped fastener 222 and the connecting portion is, for example, a glue or a snap connection. Therefore, the wearing and the taking-off can be realized quickly and conveniently. It should be understood that the tape fasteners may also be provided on the front waist region.

Fig. 5 shows a third embodiment of the present invention, in which both side edges of a crotch region 33 on which an absorbent main body 37 is disposed extend to a front waistline region 31 and a rear waistline region 32 and are integrally molded, in a pant-type sanitary napkin 3. The elastic film 363 is combined between the first nonwoven layer 361 and the second nonwoven layer 362, and includes at least one elastic body 38 located at the end of the front waist region and the rear waist region. The first nonwoven layer 361 is a single piece extending in the front waistline region 31, the back waistline region 32, and the crotch region 33. The elastic film 363 and the second nonwoven layer 362 extend in the front waist region 31 and the back waist region 32 as shown by the dotted lines.

Optionally, the

nonwoven layers

361, 362 can be a multi-component multi-layer composite structure with a denier of 0.1-7 dtex and a basis weight of 5-60 gsm. Optionally, the fabric of the elastic membrane 363 is a treated elastic microporous membrane material, and the air holes formed in the elastic microporous membrane material are invisible to naked eyes. Because the elastic film 363 is provided with a plurality of air-permeable micropores, the elastic film 363 and the other two non-woven fabric layers 361 and 362 are sequentially compounded during preparation, and the whole physical perforation of the composite layer structure is not needed after the compounding is finished.

Fig. 6 shows a fourth embodiment similar to the embodiment shown in fig. 5, in which a first nonwoven layer 461 of the pant-type sanitary napkin 4 extends in the front waist region 41, the rear waist region 42 and the crotch region 43, an elastic film 463 and a second nonwoven layer 462 extend in the front waist region 41 and the rear waist region 42, and an absorbent main body 47 covers the crotch region 43 and extends to the front waist region 41 and the rear waist region 42. The first nonwoven layer 461 extends beyond the elastic film 463 and the second nonwoven layer 462, and is folded inward at the end portions of the front waistline region and the rear waistline region to cover the second nonwoven layer 462. Optionally, the inward folded portion 464 of the first nonwoven layer 461 substantially covers the at least one elastic body 48 disposed at the waist opening.

Alternatively, the porosity of the vent in the multilayer composite structure formed by combining the first nonwoven layer 461, the elastic film 463 and the second nonwoven layer 462 according to this embodiment is 1% to 25%, more preferably 2% to 10%, more preferably 3% to 5%, and more preferably 3.5% to 4.5%.

Fig. 7 shows a fifth embodiment similar to the embodiment shown in fig. 5, in which a first nonwoven layer 561 of the pants-type sanitary napkin 5 extends in the front waistline region 51, the rear waistline region 52 and the crotch region, an elastic film 563 extends in the front waistline region 51 and the rear waistline region 52, and the absorbent main body 57 covers the crotch region and extends to the front waistline region 51 and the rear waistline region 52. In this embodiment, the second nonwoven layer 562 extending in the rear waistline region 52 extends to a part of the crotch region, and at least one elastic body 59 extending arcuately in the transverse direction is compounded between the first nonwoven layer 561 and the second nonwoven layer 562 having no elastic film, in addition to the elastic body 58 provided at the waistline opening. Thereby, the fit and comfort, especially in the crotch area, are enhanced.

Fig. 8 shows a sixth embodiment similar to the embodiment shown in fig. 5, in which a first nonwoven layer 661 of the pant-type sanitary napkin 6 extends across the front waistline region 61, the rear waistline region 62 and the crotch region, an elastic film 663 extends across the front waistline region 61 and the rear waistline region 62, and an absorbent main body 67 covers the crotch region and extends across the front waistline region 61 and the rear waistline region 62. In this embodiment, the absorbent main body 67 is provided with a bib 674 on each side edge, and the side edges of the bib 674 are folded inward and covered with at least one elastic body (not shown) extending in the longitudinal direction to form a three-dimensional bib 675, thereby helping to prevent leakage of body fluid when the user is in a position such as lying on his side. The containment 674 may be made from a skin-friendly nonwoven material.

As can also be seen in fig. 8, protective sheets 676, preferably sheet-like structures made of a highly flexible nonwoven material, may be provided on each end of the absorbent body 67. The protective sheet 676 is overlaid on the end of the absorbent main body 67 and is hot-rolled with the second nonwoven fabric layer 662. In this way, the end portions of the absorbent main body 67 and the side barriers are prevented from directly contacting the human body when worn, and do not scratch the skin of the human body.

Fig. 9 shows a seventh embodiment similar to the embodiment shown in fig. 5, in which an absorbent main body 77 of the pant-type sanitary napkin 7 covers the crotch region 73 and extends to the front waistline region 71 and the rear waistline region 72, and the front and rear waistline regions are provided with at least one elastic body 78. In this embodiment, the transverse side edges of the back waist region 72 are connected with tape fasteners 722, and correspondingly, the transverse side edges of the front waist region 71 can be provided with connecting portions, such as adhesive tapes or snaps, which are cooperatively connected with the tape fasteners 722. It should be understood that the tape fasteners may also be provided on the front waist region.

While the technical content and the technical features of the invention have been disclosed, it is understood that various changes and modifications of the disclosed concept can be made by those skilled in the art within the spirit of the invention, and the invention is not limited thereto. The above description of embodiments is intended to be illustrative, and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A disposable absorbent article comprising a front waistline region, a rear waistline region and a crotch region between the front waistline region and the rear waistline region, wherein two sides of the front waistline region and the rear waistline region are respectively joined to form a waistline opening, and two sides of the crotch region extend to the front waistline region and the rear waistline region to form a pair of leg openings;

the waist protecting belt is characterized in that the front waistline region and/or the rear waistline region is/are provided with at least one telescopic region, and the telescopic region is arranged into a multi-layer composite structure capable of elastically stretching along at least a transverse direction;

the multilayer composite structure comprises at least one layer of high polymer elastic membrane compounded with at least one layer of non-woven fabric layer, and at least one layer of the multilayer composite structure is provided with a plurality of air holes.

2. A disposable absorbent article according to claim 1, wherein said multilayer composite structure is disposed in the entire transverse direction of said front and rear waist regions and comprises a first nonwoven layer, a second nonwoven layer, and a polymeric elastic film laminated between said first and second nonwoven layers, said plurality of vents penetrating said multilayer composite structure.

3. A disposable absorbent article according to claim 2, wherein said first nonwoven layer, polymeric elastic film, and second nonwoven layer are combined by ultrasonic welding and said plurality of breathable apertures are formed at ultrasonic weld points.

4. A disposable absorbent article according to claim 3, characterized in that said multi-layer composite structure comprises a porosity of said breathable apertures in the range of 1% to 25%.

5. A disposable absorbent article according to claim 4, characterized in that said multi-layer composite structure comprises a porosity of said breathable apertures in the range of 2% to 10%.

6. A disposable absorbent article according to claim 5, characterized in that said multi-layer composite structure comprises a porosity of said breathable apertures in the range of 3% to 5%.

7. A disposable absorbent article according to any of claims 2-6, characterized in that said elastic film does not extend to the ends of said front and back waist regions, said ends of said front and back waist regions comprising at least one elastic body which is compounded between said first and second nonwoven layers and extends in the transverse direction.

8. A disposable absorbent article according to claim 7, characterized in that said first nonwoven layer extends in said front, back and crotch regions, and said elastic film and second nonwoven layer extend in said front and back waist regions.

9. A disposable absorbent article according to claim 8, characterized in that said first nonwoven layer extends beyond said elastic film and said second nonwoven layer and is folded inwardly over said second nonwoven layer at the end of said waist opening.

10. A disposable absorbent article according to claim 8, characterized in that said second nonwoven layer extends from said rear waist region to a portion of said crotch region, and at least one elastic body extending arcuately in the transverse direction is incorporated between said first and second nonwoven layers without an elastic film.

11. A disposable absorbent article according to claim 8, characterized in that said stretch zone is arranged to have a stretch ratio which continuously increases from the crotch region towards the waist-opening.

12. A disposable absorbent article according to claim 8, characterized in that said extensible zone has an extensibility of from 1.2 to 8.

13. A disposable absorbent article according to claim 8, characterized in that said extensible zone has an elastomer content of 5% to 100%, a titer of 20 to 1240dtex and a basis weight of 20 to 200 gsm.

14. A disposable absorbent article according to claim 8, characterized in that said elastic film is continuously or intermittently combined with at least one nonwoven layer.

15. A disposable absorbent article according to claim 8, further comprising an absorbent main body extending from said crotch region to said front and back waist regions, said absorbent main body being provided with containment flaps on both sides, said containment flaps having side edges folded inwardly and covered with at least one elastic body extending in a longitudinal direction to form a three-dimensional containment flap.

16. The disposable absorbent article of claim 15, wherein ends of said absorbent main body in the longitudinal direction are respectively covered with protective sheets.