Disposable hygiene article with improved fit
阅读说明:本技术 具有改善的贴合性的一次性卫生物品 (Disposable hygiene article with improved fit ) 是由 C·汉松 H·斯文松 S·埃克斯泰特 A·巴格尔-舍贝克 于 2017-06-09 设计创作,主要内容包括:本发明涉及一种具有芯的一次性卫生物品(1),该芯具有第一区域(12),该第一区域在前部(2)中或在物品的前部(2)与裆部(3)之间的过渡部(5)位置处具有沿横向(x)的最窄宽度(M)。此外,在裆部(3)中吸收芯(6)包括至少一个前压缩线,其形成基本上倒置的V,该V包括第一支脚(51)、第二支脚(53)和共同的前尖端(52),其中前部(2)中的V形第二压缩线包括第三支脚(71)和第四支脚(73)。每个支脚在相应的镜像部分(I)和(II)中以30-120°的相互夹角(α<Sub>4</Sub>)延伸并分叉,其中共同的前尖端(52)接触表示最窄宽度M的假想横线或与其间隔一定距离。(The invention relates to a disposable sanitary article (1) with a core having a first region (12) with a narrowest width (M) in the transverse direction (x) in the front portion (2) or at the location of the transition (5) between the front portion (2) and the crotch portion (3) of the article. Furthermore, the absorbent core (6) comprises at least one front compression line in the crotch portion (3), which forms a substantially inverted V comprising a first leg (51), a second leg (53) and a common front tip (52), wherein the V-shaped second compression line in the front portion (2) comprises a third leg (71) and a fourth leg (73). Each leg being at a mutual angle (alpha) of 30-120 DEG in the respective mirror image portions (I) and (II) 4 ) Extending and diverging with the common leading tip (52) contacting or spaced from an imaginary transverse line representing the narrowest width M.)
1. A disposable sanitary article (1), such as a sanitary napkin, a pad, an incontinence pad or a diaper, whereby the article has a transverse direction (x), a longitudinal direction (y) and a longitudinal centre line (A) dividing the article into two mutually symmetrical and mirror image portions (I) and (II), whereby the article (1) has a front portion (2), a crotch portion (3) and a back portion (4), and the article (1) comprises a liquid permeable topsheet (30), a liquid impermeable backsheet (31) and an absorbent core (6) arranged between the topsheet (30) and the backsheet (31), and optionally a liquid acquisition sheet (36) arranged between the topsheet (30) and the core (6), whereby the outer contour of the absorbent core (6) is defined by mirror image first and second core edge lines (8, 9) and the absorbent core (6) is defined by a core front edge (7) in the front portion (2) and a core rear edge (57) in the back portion (4), the absorbent core (6) comprises a first area (12) extending across the crotch portion (3) from the front portion (2) to the back portion (4) in the longitudinal direction (y) of the article (1), and wherein the outer contour of the first area (12) is defined by mirrored first and second first area edge lines (22, 23) and a first area front edge (67) and a first area rear edge (37), wherein
-the first region (12) has a narrowest width (M) in the transverse direction (x) at the location of the transition (5) in the front portion (2) or between the front portion (2) and the crotch portion (3); and is
-wherein the absorbent core (6) in the crotch portion (3) comprises at least one front compression line forming a substantially inverted V-shape comprising a first leg (51), a second leg (53) and a common front tip (52), wherein the front tip (52) is located on the centre line (A) and has an imaginary contact point (a) contacting an imaginary front dividing line (230) dividing the article (1) into the front portion (2) and the crotch portion (3)50) First and second legs (51; 53) at a mutual angle (alpha) of 30-120 DEG1) Diverging towards the core rear edge (57), the absorbent core (6) further comprising a V-shaped second compression line comprising a third leg (71) and a fourth leg (73), each of the third leg (71) and the fourth leg (73) being angled with respect to each other at an angle (alpha) of 30-120 DEG from the common front tip (52) towards the core front edge (7) in the respective mirror image portions (I) and (II)4) Extend and diverge, and wherein the common forward tip (52) is positioned in contact with or at a distance from an imaginary transverse line representing the narrowest width M.
2. The disposable sanitary article (1) according to claim 1, wherein the first region (12) comprises a head portion (13) and two leg portions (15, 16), the two leg portions (15, 16) extending symmetrically about the centre line (a) in the longitudinal direction (y) of the article (1), and wherein the absorbent core (6) further comprises a second region (24), the second region (24) being at least partially surrounded by the first region (12), and wherein the average density of the second region (24) is at least 20% lower, preferably at least 30% lower, most preferably at least 50% lower than the average density of the first region (12).
3. The disposable sanitary article (1) according to claim 2, wherein said two leg parts (15, 16) originate from a common leg part origin (a) in the crotch part (3)0) Starts and diverges and extends across a part of the crotch portion (3) towards individual leg ends (17, 18) in the rear portion (4), and wherein a second region (24) extends between said legs (15, 16) in the transverse and longitudinal directions (x; y) from the foot starting point (a)0) Extending to an end point (a) in the rear portion (4)l) And whereby the distance (a) in the transverse direction (x) between facing sides (19, 20) of the respective foot parts (15, 16) isx) Varies in the longitudinal direction (y) and has a maximum distance (a) in the transverse direction (x) between facing sides (19, 20) of the respective leg portions (15, 16)1) Is located in the crotch portion (3) at a position corresponding to the position of the crotch point (21) in the longitudinal direction (y), and wherein said facing sides (19, 20) of the respective foot portions (15, 16) converge back in the longitudinal direction (y) such that said distance (a)x) From the maximum distance (a)1) Reduced to a minimum distance (a)2)。
4. The disposable sanitary article (1) according to claim 3, wherein said second region (24) comprises a central region (25) extending symmetrically about said centerline (A) and being longer in extension in the longitudinal direction (y) than in the transverse direction (x), and a rear section (38), said rear section (38) extending longitudinally and symmetrically about the centerline (A) and being in contact with the central region (25), and the central region (25) and the rear section (38) are delimited by facing sides (19, 20) of the respective foot portions (15, 16).
5. Root of herbaceous plantThe disposable sanitary article (1) according to claim 4, wherein said central area (25) is comprised at a starting point a0And the central region endpoint aeAlong said centre line (a), a weakened compression line (250).
6. The disposable sanitary article (1) according to any one of the preceding claims 4 or 5, wherein the maximum width (a) of the central area (25)1) 10-50mm and 50-110mm in length, and the minimum width (a) of the rear section (38) defined by the facing sides (19, 20) of the respective foot portion (15, 16)2) 5-30mm in length and 30-110mm in length.
7. The disposable sanitary article (1) according to any one of the preceding claims 4-6, wherein the central region (25) extends in the thickness direction (D) of the article such that the central region (25) protrudes outwardly from the plane of the first region (12).
8. The disposable sanitary article (1) according to any of the preceding claims 2-7, wherein the first area (12) is compressed more than the second area (24) and the first area (12) is stiffer than the second area (24).
9. The disposable sanitary article (1) according to any of the preceding claims 2-8, wherein said second area (24) covers 10% to 50% of the total area of the core (6).
10. The disposable sanitary article (1) according to any one of claims 2 to 9, wherein the average density of the absorbent material of the first zone (12) is 150-220kg/m3Preferably 160-210kg/m3And the average density of the absorbent material of the second zone (24) is 70-150kg/m3Preferably 80 to 130kg/m3。
11. The disposable hygiene article (1) according to claim 10, wherein a higher average density of the absorbent material is obtained by compressing and/or providing the first area (12) with an embossing pattern (40) covering at least a part of the first area (12), and wherein the second area (24) is free of an embossing pattern (40).
12. The disposable sanitary article according to claim 11, wherein the embossing pattern (40) comprises individual dots (15') placed in a predetermined pattern.
13. The disposable sanitary article (1) according to any one of the preceding claims, wherein in the front portion (2) the narrowest width (M) in the transverse direction (x) of the first region (12) of the core (6) is from 15 to 45 mm.
14. The disposable sanitary article (1) according to any one of the preceding claims, wherein said common front tip (52) is located 40-80mm from said crotch point (21).
15. The disposable hygiene article (1) according to any of the preceding claims, wherein the first, second, third and fourth legs (51, 53, 71, 73) of the compression lines extend up to the respective first and second first region edge lines (22; 23) and/or the respective first and second core edge lines (8, 9).
16. The disposable sanitary article (1) according to any one of the preceding claims, wherein the longitudinal distance between an imaginary transverse line indicating the narrowest width M and the front tip (52) is 0-10 mm.
17. The disposable sanitary article (1) according to any one of the preceding claims, wherein the absorbent core (6) in the crotch portion (3) comprises a first back compression line (61) and a second back compression line (63), wherein the lines (61; 63) diverge from each other in a direction towards the core front edge (7) and each line (61; 63) has a divergence angle (α) of 15-60 ° with respect to the extension of the centre line (A)2;α3) Wherein the line (61; 63) has a first edge up to a respective first and second first region edge line (22; 23) and/or phasesExtension of the respective first and second core edge lines (8, 9).
18. The disposable sanitary article (1) according to claim 17, wherein said first and second rear compression lines (61; 63) are spaced apart from each other in the transverse direction (x) so that there is no common rear tip (62).
19. The disposable sanitary article (1) according to claim 17, wherein the first and second back compression lines (61; 63) form a V-shape comprising a common back tip (62), wherein the lines (61; 63) meet at the back tip (62), the tip (62) having an imaginary contact point (a) contacting an imaginary back split line (340) dividing the article (1) into the crotch portion (3) and the back portion (4)80)。
20. The disposable sanitary article (1) according to any one of the preceding claims, wherein said compression lines (51, 53; 71, 73; 61, 63) are obtained by groove compressing said core (6) and optionally acquisition sheet and/or topsheet with high pressure compression from the topsheet (30) side or backsheet (31) side of the article (1).
21. The disposable sanitary article (1) according to any one of the preceding claims, further comprising a liquid acquisition sheet (36) located between the topsheet (30) and the core (6).
22. The disposable sanitary article (1) according to claim 21, wherein said liquid acquisition sheet (36) consists of an airlaid nonwoven having a grammage of 50-100 gsm.
23. The disposable sanitary article (1) according to claim 21, wherein the liquid acquisition sheet (36) consists of a spunlace nonwoven having a grammage of 30-90 gsm.
24. The disposable hygiene article (1) according to claim 21, wherein the liquid acquisition sheet (36) consists of a high loft fibrous material having a grammage of 30-90 gsm.
25. The disposable sanitary article (1) according to any of the preceding claims 21-24, wherein the liquid acquisition sheet (36) has a greater extension than the core (6) in both the transversal (x) and longitudinal (y) extension of the core (6) and is in contact with the core (6).
26. The disposable hygiene article (1) according to claim 25, wherein the liquid acquisition sheet (36) consists of a high loft fibrous material and wherein the first region (12) of the core is embossed while the edge region (26) of the liquid acquisition sheet (36) is free of an embossing pattern and/or compression.
27. Method for manufacturing a disposable article (1) according to any of claims 1-26, comprising the steps of:
-feeding a liquid permeable topsheet material layer, a liquid impermeable backsheet material layer and an absorbent material layer arranged to be positioned between the topsheet material layer and the backsheet material layer, and optionally an acquisition material layer arranged to be positioned between the topsheet material layer and the absorbent material layer, and performing the following steps before or after joining the layers:
-compressing lines of compression (51; 53; 71; 73) extending in the front and crotch portions (2, 3) by high pressure compression from the topsheet (30) side or the backsheet (31) side of the core (6);
-optionally compressing the core (6) by means of the groove to provide a weakened compression line (250), which weakened compression line (250) is along the centre line (a) at the starting point a0And the central region endpoint aeExtending therebetween.
28. The method of claim 27, further comprising forming the first and second regions (12, 24) of the core (6) by compressing the first region (12) more than the second region (24) and/or embossing an embossing pattern (40) into a section of the core (6) providing the first region (12).
29. The method according to claim 28, wherein the first region (12) is formed before the backsheet is joined with the absorbent core, the topsheet and the optional liquid acquisition sheet of the article.
Technical Field
The present invention relates to disposable hygiene articles, such as sanitary napkins, liners, incontinence pads or diapers, which are designed such that they take a specific form when in use to provide improved fit and leakage-proof safety. The invention also relates to a method for manufacturing a disposable sanitary article.
Background
Disposable hygiene articles need to have good absorption properties, comfort and to provide leakage safety and good fit to the user. Various designs and methods have been employed in sanitary articles to make them conform well to the contours of the user's body and not dislodge during use. For example, in applicant's own prior application WO2008/004961a1, an absorbent article having improved fit has been shown. The absorbent article comprises an absorbent core comprising a first region having two legs extending across at least a part of the crotch portion in the longitudinal direction of the article towards the ends of the individual legs in the rear portion. The legs are symmetrically arranged about a longitudinal centre line and the distance between facing sides of the respective legs in the transverse direction varies in the longitudinal direction. The maximum distance is located in the crotch portion, and the position in the longitudinal direction corresponds to the position of the crotch point. The facing sides of the respective legs converge rearwardly in the longitudinal direction such that the distance decreases from the maximum distance to a minimum distance in the rear portion. The absorbent core further comprises a second region surrounding said first region and extending between said first region and the periphery of said article. The average density of the absorbent core in the second region is lower than the average density in the first region. By this design, improved leakage security is obtained with good fit and correct and reliable placement of the article. However, despite efforts to improve the fit of articles, there is still a desire to further improve the fit of articles and how the articles conform to the body of the user. Furthermore, there is a need for a simple method of manufacturing such products on existing equipment.
Disclosure of Invention
It has been found that despite the prior art solutions for disposable sanitary articles, there is still a need to improve the fit of the article, in particular how the article conforms to the body of the user. There is a need for better control of how the article bends and fits the body, particularly in terms of the front and crotch portions, including the central region of the article. It is important to obtain a good and close fit to the body in the front, crotch and back parts of the article. It is also important that existing equipment can be used to manufacture articles with minimal modification.
Accordingly, it is an object of the present disclosure to provide a disposable hygiene article having improved article fit and an improved way of conforming the article to the body of the user. It is an object to provide an article which conforms to the body in an improved way in at least the front part of the article. In addition, it is desirable to provide a good fit in the back and crotch portions of the article.
In addition, it is an object of the present invention to provide a disposable absorbent sanitary article with improved comfort, while the absorbency of the article is satisfactory. The disposable hygiene article may be a sanitary napkin, a pad, an incontinence pad or a diaper.
Further, it is an object of the present disclosure to provide a disposable sanitary article which can be easily manufactured in existing equipment with minimal modification.
The above objects are achieved by the disposable sanitary article according to the present invention as defined in the appended claims.
The present invention therefore relates to a disposable sanitary article, such as a sanitary napkin, a pad, an incontinence pad or a diaper, said article having a transverse direction, a longitudinal direction and a longitudinal centre line dividing the article into two mirror image parts which are symmetrical to each other. The article has a front portion, a crotch portion and a back portion. The article comprises a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent core disposed between the topsheet and the backsheet, and optionally a liquid acquisition sheet disposed between the topsheet and the core. The outer contour of the absorbent core is defined by mirrored first and second core edge lines, and the core is bounded by a core front edge in the front portion and a core rear edge in the rear portion. The absorbent core comprises a first area extending across the crotch portion in the longitudinal direction of the article from the front portion to the back portion. The outer contour of the first region is defined by mirrored first and second first region edge lines, and the first region of the core has a narrowest width in the transverse direction in the front portion or at a transition between the front portion and the crotch portion.
Further, the absorbent core and its first region in the crotch portion comprises at least one front compression line forming a substantially inverted V-shape comprising a first leg, a second leg and a common front tip. The front tip is located on the center line a and has an imaginary contact point with an imaginary front dividing line dividing the article into a front portion and a crotch portion. The first leg and the second leg diverge at a mutual angle of 30-120 deg. towards the rear edge of the core. The absorbent core and its first region further comprise a second compression line of the V-shape comprising a third leg and a fourth leg extending and diverging from the common front tip to the core front edge in respective mirror image portions at a mutual angle of 30-120 °. The common front tip is in contact with or at a distance from an imaginary transverse line indicating the narrowest width M. In this way, a structure is provided which conforms to the body of the user in an improved manner, since the cross or X-shape formed by the compression lines, together with the particular location of the narrowest width of the first region, enhances the bending of the front portion towards the pubic region of the user.
Preferably, the first region comprises a head portion and two leg portions extending symmetrically about the centre line and in the longitudinal direction of the article. Furthermore, the absorbent core suitably comprises a second region which is at least partially surrounded by said first region. Preferably, the average density of the second region is at least 20% lower, preferably at least 30% lower, most preferably at least 50% lower than the average density of the first region. Suitably, the average density of the second region is at most 70% lower than the average density of the first region. Thus, the second region provides a soft contact area towards the user's body.
Suitably, the leg portions start from a leg portion origin in the crotch portion and extend across a part of the crotch portion towards a separate leg portion end in the rear portion. The second region preferably extends between the legs in both the lateral and longitudinal directions from a leg start point to an end point in the posterior portion. In the transverse direction, the distance between the facing sides of the respective leg portions varies in the longitudinal direction, whereby the maximum distance between the facing sides of the respective leg portions in the transverse direction is located in the crotch portion at a position corresponding to the crotch point position in the longitudinal direction. The facing sides of the respective leg portions converge longitudinally rearwardly such that the distance decreases from the maximum distance to a minimum distance. In this way, a second region is provided that conforms to the anatomy of the user.
The second region includes a central region extending symmetrically about the center line and having a longer extension in the longitudinal direction than in the lateral direction, and a rear section extending longitudinally and symmetrically about the center line and contacting the central region. The central region and the posterior segment are bounded by facing sides of the respective leg portions. Thus, the central region may provide at least a portion of the wetted area of the article.
The central region may include a weakened compression line extending along the centerline between the starting point and the central region endpoint. In this way, longitudinal bending of the central region towards the genitals of the user during use may be further facilitated.
The maximum width of the central region may be 10-50mm and the length may be 50-110 mm. In this way, the liquid absorption properties in the wet area of the article can be improved.
The minimum width of the rear section, which is limited by the facing sides of the respective leg parts, may be 5-30mm and the length may be 30-110 mm. In this way, the fit of the rear section to the user's body may be improved.
The central region may extend in the thickness direction of the article such that it projects outwardly from the plane of the first region. In this way, a raised portion is provided which can be brought into contact with the genitals of the user in an easy manner during use.
Preferably, the first region is more compressed than the second region, and the first region has a higher density and is therefore also stiffer than the second region. In this way, the bending can be controlled in an improved way, thereby controlling how the article fits the user's body.
The second region may cover 10-50% of the total area of the core. In this way, a soft area may be provided, while bending of the article may be controlled.
Suitably, the first region has a higher average density of absorbent material in the first region than in the second region. In this way, the bending properties of the article can be controlled in a predetermined manner. The average density of the absorbent material in the first region may be 150-220kg/m3Preferably 160-210kg/m3. The average density of the absorbent material of the second zone may be in the range of 70-150kg/m3Preferably 80 to 130kg/m3. How the density is measured as referred to herein will be described later in the detailed description. The lower density region allows liquid to enter the core quickly, while the higher density provides better liquid distribution and also allows liquid to be absorbed in a repeated manner. Thus, the entire capacity of the core can be better utilized. The low density region also allows the acquisition layer to be omitted from the article.
A higher average density of the absorbent material may be obtained by compressing and/or providing the first area with an embossing pattern covering at least a part of the first area, and wherein the second area is free of the embossing pattern. Suitably, the second region is also not compressed. In this way, the article can be easily manufactured, while the hardness properties can be controlled in a desired manner. The embossing pattern may comprise individual dots placed in a predetermined pattern. In this way, an aesthetically pleasing product may also be provided.
In the front portion, the narrowest width of the first region of the core is suitably 15 to 45mm in the transverse direction. In this way, the article can be anchored between the user's tendons forming part of the muscle group originating inside the pelvic diaphragm and connected along the thighs. Anchoring can thus take place in an optimal manner.
The front compression lines having a common front tip at a determined longitudinal distance from the narrowest width of the first zone promote a transverse bending of the front portion of the article towards the body of the user during use, so that the fit of the product is improved. The longitudinal distance between an imaginary transverse line representing the narrowest width M and the front tip may be 0-10 mm. In this way, the front portion may be provided with improved bending properties.
Typically, the core has a monolithic structure that is manufactured by a one-step process of a common core material. The first and second regions refer to regions of the core having different properties, i.e. different densities and/or the regions may be embossed and/or printed with different designs, and the first region is stiffer than the second region. In this way, the first and second regions may be visually and/or by means of different physical characteristics distinguished. By the different properties in this area, the fit of the product can be improved and/or the positioning of the product on the underwear of the user can be facilitated, for example.
The first, second, third and fourth legs may extend up to the respective first and second first region edge lines and/or the respective first and second core edge lines. In this way, the first region will have a certain stiffness at the front and will therefore not easily bend in the longitudinal direction during use of the article. However, the article can be bent diagonally and by providing X-shaped compression lines comprising V-shaped and inverted V-shaped compression lines having a common apex, the bending of the front of the product can be easily controlled.
The absorbent core may comprise a first back compression line and a second back compression line in the crotch portion, wherein these lines diverge from each other in a direction towards the front edge of the core. Each line may have a bifurcation angle of 15-60 ° with respect to the extension of the centerline (a). The line may have an extension up to the respective first and second first region edge lines and/or the respective first and second core edge lines. The rear compression lines also promote lateral bending of the rear portion of the article towards the user's body during use, thus further improving the fit of the product. The post-compression line is a straight line or substantially straight line produced by a groove or line compression tool having a straight line shape. However, in products, there may be slight variations due to the nature of the compressible material used in the absorbent article.
The first and second back compression lines may be laterally spaced from each other so that there is no common back tip. In this way, for example, the rear section of the article may remain intact.
According to another variant, the first and second back compression lines may form a V-shape comprising a common back tip at which the lines meet. The pointed end suitably has an imaginary contact point with an imaginary rear dividing line dividing the article into a crotch portion and a rear portion. In this way the product will bend more effectively in the area outside the central area of the second area.
The compression lines may be obtained by groove or line compression of the core and optionally the acquisition sheet and/or topsheet from the topsheet side or the backsheet side of the article by high pressure compression. In this way all layers are compressed by the thread to further improve the bending properties of the article during use. Optionally, the backsheet is not compressed.
The disposable hygiene article may further comprise a liquid acquisition sheet located between the topsheet and the core. In this way, the liquid inlet characteristics can be improved. The fluid acquisition sheet may have a grammage of 50 to 100gsm (g/m)3) An air-laid nonwoven fabric. Alternatively, the liquid acquisition sheet may be composed of a spunlace nonwoven having a grammage of 30-90 gsm. Further, the liquid acquisition sheet may be comprised of a high loft fibrous material having a grammage of 30-90 gsm. Different materials may provide different properties, and thus the article may be tailored as desired.
The liquid acquisition sheet may have a greater extension in both the transverse and longitudinal directions than the core and be positioned in contact with the core. In this way, an article with high comfort may be provided. Furthermore, since the liquid acquisition sheet covers and in this way conceals the edges of the core which may not be flat, the visual appearance of the article may be improved.
According to one variant, the liquid acquisition sheet may be composed of a fibrous material of high loft. The first region of the core may be embossed and the edge region of the liquid acquisition sheet may be free of the embossing pattern and/or compression. In this way, an article with soft sides can be provided.
The common front tip can be kept at a distance of 40-80mm from the crotch point, thus ensuring that the wet area does not bend during use and thereby negatively affect the absorption properties.
The invention also relates to a method for manufacturing the above-mentioned disposable article, comprising the steps of:
-feeding a liquid permeable topsheet material layer, a liquid impermeable backsheet material layer and an absorbent material layer arranged to be positioned between the topsheet material layer and the backsheet material layer, and optionally an acquisition material layer arranged to be positioned between the topsheet material layer and the absorbent material layer, and before or after joining of the layers:
-compressing the compression lines extending in the front and crotch portions by high pressure compression from the topsheet or backsheet side of the core;
-optionally, compressing the core by means of grooves to provide a starting point a along the centre line0And the central region endpoint aeA weakened compression line extending therebetween.
The method may further comprise forming the first and second regions of the core by compressing the first region more than the second region, and simultaneously or subsequently performing the step of embossing the embossing pattern to the sections within the core that provide the first region.
In this method, the first region may be formed before the backsheet of the article is joined with the absorbent core, the topsheet and the optional liquid acquisition sheet.
Further objects, features and advantages of the present disposable hygiene article and the method for manufacturing the same are described in the following detailed description with reference to the accompanying drawings.
Drawings
Fig. 1 schematically illustrates a plan view of an exemplary disposable hygiene article according to the present disclosure;
FIG. 2 schematically illustrates a plan view of another exemplary disposable hygiene article according to the present disclosure;
FIG. 3 schematically illustrates a plan view of yet another exemplary disposable hygiene article according to the present disclosure;
FIG. 4 schematically illustrates a first region and a second region in a disposable hygiene article according to the present disclosure;
FIG. 5 shows a side view of the disposable hygiene article of FIG. 6;
FIG. 6 schematically illustrates a plan view of first and second regions with highlighting of another exemplary disposable hygiene article according to the present disclosure;
fig. 7 schematically illustrates an article according to the present disclosure when a bending force is applied to the article in use, i.e. during use.
Detailed Description
The disposable sanitary article of the present invention is an absorbent article for personal hygiene and may be, for example, a sanitary napkin, a pad, an incontinence pad or a diaper. Such articles are commonly used for collecting and storing bodily exudates, such as urine, faeces or menstrual fluid. The absorbent article is disposable, which means that it is intended to be used only once and discarded thereafter, rather than being cleaned and reused. The absorbent article may suitably be a sanitary towel and the design of the article is particularly suitable for sanitary towels.
A plan view of an embodiment of a disposable
The total length of the
In use, the
The
The
The disposable hygiene article of the present disclosure comprises an absorbent core, which is indicated in the figures with
Typically, the core may be of unitary construction, whereby the manufacturing process may be simplified, for example. In this context, the phrase "unitary structure" is intended to mean that the absorbent core is composed of substantially one type of material, which is substantially the same material, or substantially the same combination of two or more materials throughout the absorbent core. Variations in the density and concentration of the materials may occur, but these variations are limited to those obtained without introducing regions that have been separately formed and then physically joined to each other. For example, when the absorbent core comprises a matrix of hydrophilic fibers and superabsorbent material as described above, the relative concentrations of superabsorbent material and fibers may differ in different parts of the core. However, the absorbent core of the unitary structure does not comprise layers or laminates of different compositions. Also, variations in the density or concentration of the various components in the longitudinal, transverse or thickness direction of the absorbent core are acceptable, but the core should not include regions or layers of different components that are formed separately and subsequently joined together. Examples of methods for manufacturing the absorbent core will be described below.
As shown in fig. 1 to 4 and 6, the outer contour of the
The
The
As shown, the
The facing sides 19, 20 of the
The
The
Typically, the absorbent core has an asymmetric shape over the longitudinal extension, but the first and second longitudinal portions are symmetric about the centre line a over the transverse extension. The core may have different shapes, but the periphery of the core defines a shape in which the head and at least one neck region (i.e. a region having a smaller width in the transverse direction) are located in the front or transition region of the core. In this way, the article can better conform to the shape of the body in the region where the front transitions into the crotch portion. In practice this means that the article can bend more easily in the transverse direction in the region of the neck. Thus, the front portion and the core head portion may be bent towards the user, whereby the front portion may better cover the pubic region of the wearer, while the crotch portion can be positioned close to the genital region of the female wearer. In addition, the article will better remain in its position during use. The neck region of the core may be the same as where the first region has its narrowest width, or may be spaced therefrom. Figure 7 shows how the product bends in use.
In fig. 1 to 3, an
The
In case the
The longitudinal edges 22, 23 of the
The average density of the
According to the embodiment shown in fig. 2 and 3, the
In the embodiment shown in fig. 2, the first
Fig. 3 shows another embodiment of a post-compression line according to the present disclosure. In this embodiment, the first
In the embodiment shown in fig. 2 and 3, the first
By substantially inverted V-shape or V-shape is meant that the shape is symmetrical with respect to the centre line a, or that the inverted V-shape or V-shape is slightly inclined with respect to the centre line a, for example due to manufacturing tolerances. Thus, the respective legs in the respective longitudinal sections I and II may have different angles of inclination with respect to the centre line a. For example, when the inverted V-shape is symmetrical, the end point a10And a20The line in between is transverse and substantially not inclined with respect to the transverse direction x. In a similar manner, endpoint a60And a70And endpoint a30And a40The lines in between are transverse. However, there may be less tiltThe slope, but the slope of the line extending between the end points should be less than 5 °, i.e. 0-5 °, which means at the end point a10And a20The inclination of the line in between with respect to the transverse extension x should be less than 5 deg.. Furthermore, the length of the individual legs in the individual longitudinal sections may differ. The difference in length is at most 10%. For example, if the length of the legs in the first longitudinal section I is 40mm, the length of the legs in the second longitudinal section should be in the range of 36 to 44 mm.
The back and
The
As shown in FIG. 2, the
Absorbent articles according to the present disclosure may further comprise a liquid acquisition sheet which serves as a liquid distribution layer. The liquid acquisition sheet is positioned between the topsheet and the core and is suitably placed on top of the absorbent core. Figure 2 schematically shows the layers of an article according to the invention. The liquid acquisition sheet is shown at 36. The liquid acquisition sheet is adapted to quickly receive and temporarily store discharged liquid before it is absorbed by the absorbent core. Such an acquisition distribution layer may be comprised of, for example, an airlaid nonwoven, a spunlace nonwoven, a high loft nonwoven, or a foam material. The nonwoven material may be hydrophilic. The hydrophilic material may be obtained by adding a surfactant.
Airlaid nonwovens can be made from fluff, wood pulp, in which case the fluff fibers are dispersed into a rapidly moving air stream and consolidated onto a moving screen by pressure and vacuum. The web may be bonded with a resin and/or a thermoplastic resin dispersed in the pulp. The web may be thermally bonded (by heat), latex bonded (by adhesive) or multiple bonds (a combination of thermal bonding and latex bonding) or mechanically bonded (high compression and temperature, by hydrogen bonding). The grammage of the airlaid nonwoven may suitably be from 50 to 100 gsm.
The high loft material is a nonwoven material and may be substantially free of absorbent fibers and superabsorbent material. The high loft nonwoven material may comprise thermoplastic polymer fibers and may be selected from, but is not limited to, polyesters, polyamides, and polyolefins such as Polyethylene (PE) and polypropylene (PP), and may be a mixture of any of these. High bulk compared to flat paper-like fabricsThe material is a low density, bulky fabric. High loft webs are characterized by relatively low density. This means that there is a relatively large amount of void space between the fibers. The high loft nonwoven fibrous layer of the present invention may generally have less than 0.200g/cc (200 kg/m)3) In particular in the range from 0.015g/cc to 0.150g/cc (15 kg/m)3To 150kg/m3) In the range of (1), especially from 0.030g/cc to 0.100g/cc (30 to 100 kg/m)3) For example, 0.065g/cc (65 kg/m)3) Within the range of (1). The average density can be calculated by dividing the basis weight of the high loft layer by the thickness measured at 0.5kPa pressure (see method details below). Typically, the high loft material has a thickness of greater than about 0.5 mm, for example greater than 1mm or suitably 1.5-2.0 mm, and a low solids content, typically less than 15% by volume. The high loft nonwoven layer may advantageously be a spunmelt nonwoven layer. Spunmelt is a generic term describing the manufacture of nonwoven webs directly from thermoplastic polymers. It comprises two processes and a combination of both: spun (also known as spunbond) nonwovens and meltblown nonwovens. In the spinning process, the polymer particles are melted and the molten polymer is extruded through a spinneret. The continuous filaments are cooled and deposited onto a conveyor to form a uniform web. Some residual temperatures may cause the filaments to adhere to each other, but this is not considered the primary method of adhesion. The advantage of the spinning process is to give the nonwoven more strength, but the flexibility of the raw material is more limited. Coextrusion of the second component is commonly used in several spinning processes to provide additional properties or bonding capability. In meltblown web formation, a low viscosity polymer is extruded into a high velocity gas stream as it exits the spinneret. This disperses the melt, causing it to solidify and spread into a fibrous web. The liquid acquisition sheet material may be a spunbond material and may be a spunbond-melt bond-spunbond (SMS) material. The high loft nonwoven layer may in particular have a thickness in the range of 0.30mm to 2.00mm, e.g. 1.0mm, measured at a pressure of 0.5kPa (according to the test method described further below). The grammage, i.e. basis weight, of the high loft material may be, for example, in the range of 15gsm to 500gsm, in particular in the range of 30gsm to 200gsm, such as 30-90gsm, such as 64 gsm.
According to another variation, the acquisition sheet is a spunlace (also known as spunbond) nonwoven material. Hydroentangled nonwoven products are obtained by a process of hydroentangling loose fibrous webs with high pressure by means of rows of water jets; this process entangles the fabric and interconnects the fibers. Hydroentangled nonwoven fibers or hydroentangling have several terms such as air jet, needle, water or hydro entangling, but the terms hydroentangling or hydroentangling are the most commonly used in the nonwoven industry. The raw material of the acquisition sheet may be polypropylene (PP), Polyethylene (PE), Polyester (PET), Polyamide (PA), cellulose fibers or combinations thereof, and different weights and compositions are possible, such as viscose, polyester, cotton, nylon and ultra-fine fibers, with viscose being the most common raw material. Thus, if a combination of different fibers is used, this may be a mixture of fibers from different polymers, although each fiber may also include a different polymer (e.g., a PP/PE bicomponent fiber or PP/PE copolymer). Where appropriate, the plastic film may consist of PE or PP, PET, PLA or amyl (or, for that matter, any other thermoplastic polymer) or a mixture or copolymer of the aforementioned polymers. Hydroentangled materials typically include polypropylene or polyethylene fibers, which provide the best comfort to the nonwoven material. Other suitable fibers for making the nonwoven material are, for example, natural fibers such as bamboo, cotton and linen. The grammage of the spunlace nonwoven material may typically be 40-90 gsm.
In accordance with the present disclosure, the
Fig. 6 shows another example of a disposable hygiene article according to the present disclosure. The
As previously explained in connection with fig. 1 to 3, the
The facing sides 19, 20 of the
Furthermore, the
The width M of the first region, which has a higher density and is therefore stiffer than the second region, is preferably between 15mm and 45mm, more preferably between 25mm and 35 mm. If the width M exceeds about 35mm, the
The two
As described above, the
Suitably, the thickness of the
Furthermore, if the absorbent material comprises superabsorbent polymers (SAP), the weight and volume of SAP is omitted when calculating the density of the first and
Material should be present in the lower
Many methods for measuring the average density of an absorbent core or the average density of a sample have been described in the literature. In particular, the average density of the absorbent core sample can be measured according to the following steps:
the absorbent article has been carefully layered: any inner layer or backsheet is removed leaving only a unitary core.
-applying a pressure of 0.5kPa to the absorbent core by means of a platen which is smaller than the area of the sample of the absorbent core where the density is to be measured so as to place the platen in the area to be measured.
The thickness of the sample was measured under this pressure.
Cutting out the samples whose density is to be calculated from the core and calculating the surface weight (g/cm) of these samples from their mass/surface area2)。
-calculating the average density of these areas from the surface weight and thickness. The average density (kg/m) was calculated by dividing the surface weight by the thickness3)。
As shown in fig. 7, the geometric design of the
In use, the
The
Where the article comprises a
The slit 39 may be from a starting point a located in the centerline a in the
By providing the slit 39 to extend at least partially along the length of the
Furthermore, the
In addition, the higher average density of the
A suitable technique for making the absorbent cores of the present disclosure is mat forming by air-laying. In this process, a gas permeable mold is provided. The fibrous material is air-laid into the molds and the molds are filled to produce the absorbent core therein in a desired amount of fibrous material.
After the
Thus, the first region of the core is more compressed than the second region. Alternatively or additionally, the first area is embossed to provide only a higher compression or to further increase the level of compression achieved by the compression. If compression and embossing are separate steps, the embossing step of the embossed pattern may be performed simultaneously with or subsequent to the compression of the zone providing the first area. The embossed pattern is suitably visible through the topsheet. The compression and embossing may be performed through the topsheet or backsheet side of the core.
The core may be compressed by the groove to provide a compression line comprising a weakened compression line. This is typically done from the backsheet side of the core, but depending on the process equipment, it may be done from the topsheet side of the core.
In the efficient mat forming process today, mat forming wheels are used, as described in US 4765780, SE9401542-7 and EP-a 2-1253231. The air-permeable molds are evenly spaced around the periphery of the slab forming wheel. The fibrous material (and any other material that may be desired) is fed from the factory through a blower and onto the mat-forming wheel through the mat-forming hood. More than one mat-forming hood may be present per forming wheel and the concentrations of the various components may vary in different hoods.
In an alternative to forming in a mat-forming wheel, the absorbent core of the invention may be manufactured by laying fibrous material (together with any other material that may be required) on a web having a profile that ultimately results in a density difference over different portions of the web material. The material may be prefabricated and rolled into rolls.
Alternatively, the
In this way, regions of different density can be established within the
As shown in fig. 1, the
The
In this manufacturing method, a liquid permeable topsheet material layer, a liquid impermeable backsheet material layer and an absorbent material layer are fed to a manufacturing apparatus. The core is arranged to be positioned between a layer of topsheet material and a layer of backsheet material. The acquisition material layer is arranged to be located between the topsheet material layer and the absorbent material layer. Slits 39 are formed on the acquisition layer material by a knife at predetermined intervals. The core is formed as described above.
The
However, even if the
Furthermore, in an alternative embodiment, the
The
Although the above discussion has been exemplified by a sanitary napkin, the present invention can also be used with other absorbent articles such as diapers, incontinence pads or liners. For example, application of the present invention to diapers would provide similar benefits in terms of comfort, fit, and leakage prevention.
The invention is not to be considered as being limited by the foregoing description. Rather, the scope and limitation of the invention is defined by the appended claims.
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