Disposable sanitary articles with improved fit

Abstract

The present disclosure relates to a disposable sanitary article having a transverse (x), a longitudinal (y) orientation and a longitudinal centerline (A) that divides the article into a left-hand portion (i) and a right-hand portion (ii). The article has a front portion (2), a crotch portion (3) and a back portion (4), and comprises a liquid-permeable top sheet (30), a liquid-impermeable back sheet (31) and an absorbent core (6) disposed between the top sheet (30a) and the back sheet (31a). The top sheet (30) and the back sheet (31) extend beyond the absorbent core (6) to provide an outer boundary region (11) around the absorbent core (6) of the article. The outer contour of the absorbent core (6) is defined by mutually symmetrical mirrored portions symmetrically arranged about the longitudinal centerline (A) and defined by left and right core edge lines (8, 9), the core extending between a core leading edge (7) in the front portion (2) and a core trailing edge (10) in the back portion (4). The core (6) includes a neck region (13) in which the transverse width (M) between the left and right core edge lines (8, 9) is less than the transverse width of the core (6) in front of the neck region (13) and the transverse width behind the neck region (13). The portion of the core in front of the neck region (13) is defined as the head region (14) of the core (6), and the portion of the core behind the neck is defined as the main body portion (15). The article also includes at least one asymmetric wing as viewed along any transverse axis, the asymmetric wing including an outer edge (38) extending outwardly from the periphery (18) of the disposable sanitary article, and wherein the outer edge (38) of the at least one asymmetric wing is at least one of the edges of the wing and the outer edge (38) of the wing extending outwardly from the periphery (18) of the disposable sanitary article. w The front wing joint (19, 20) and the rear wing joint (21, 22) are connected to the outer periphery of the disposable sanitary article. The outer edge (38) of the at least one asymmetric wing includes a front wing distance point D f Distance from rear wing to point D r , where the wing distance point is laterally outboard from the line of fusion J wThe absorbent core (6) further comprises a first and a second front anastomosis line (101, 102), wherein the first front anastomosis line (101) is symmetrically arranged with respect to the longitudinal axis or the transverse axis with respect to the second front anastomosis line (102). The first front anastomosis line (101) extends along a first diagonal axis CL1 extending in the plane of the disposable sanitary article from an outer free end located on or adjacent to the left outer edge toward an inner end located on or adjacent to the longitudinal center line (A). The second front anastomosis line (102) extends along a second diagonal axis CL2 extending in the plane of the disposable sanitary article from an outer free end located on or adjacent to the left or right outer edge (8, 9) toward an inner end located on or adjacent to the longitudinal center line, and the first and second diagonal axes (CL1, CL2) converge at a convergence point C. The first and second anterior staple lines (101, 102) have a minimum lateral distance S between their closest approaches, wherein the lateral distance S is ≥ 0 mm.

Description

Technical Field

[0001] The present invention relates to disposable sanitary articles, such as sanitary napkins, panty liners or incontinence pads, which are designed so that they adopt a specific form during use, in order to provide an improved fit and security against leakage. Background Art

[0002] Disposable sanitary articles need to have good absorbency, be comfortable, and provide users with a sense of leak safety and a good fit. Various designs and methods have been employed in sanitary articles to ensure they conform to the user's body contours and prevent them from moving out of place during use. However, despite previous efforts in the art to improve the fit of articles, there remains a need to further improve the fit of articles and how they can better conform to the user's body. Summary of the Invention

[0003] It has been discovered that despite existing solutions for disposable sanitary articles, there remains a need to improve the fit of the articles, particularly how they conform to the user's body. There is a need for greater control over how the articles flex and conform to the body, particularly in the crotch area and front of the article. For comfort and safety against leaks, it is important that the articles deform in a predictable manner to accommodate the user's anatomy, and that the wings are positioned so as not to interfere with the article's conformability to the user's anatomy. It is also important that existing manufacturing equipment and methods can be used to manufacture the articles with minimal modification.

[0004] Therefore, one of the objects of the present disclosure is to provide a disposable sanitary article having improved fit and an improvement in the manner and consistency with which the article fits the user's body. In particular, the present invention aims to provide an improved fit in the front and crotch regions of the article. Improved leakage safety is also desirable, due to the optimal positioning of the wings around the user's underwear for optimal placement of the article.

[0005] Another object of the present disclosure is to provide an article with improved comfort for the user while maintaining satisfactory or improved absorbency.The disposable hygiene article may be a sanitary napkin, a panty liner, an incontinence pad or an insert having wings for folding around the crotch edge.

[0006] The above-mentioned objects can be achieved by the disposable sanitary article of the present invention. According to the following description of the present invention, further advantages provided by the present disclosure will be apparent to those skilled in the art.

[0007] In a first aspect of the present invention, a disposable sanitary article is provided, the disposable sanitary article having a horizontal, vertical and longitudinal centerline that divides the article into a left-hand portion and a right-hand portion. The article has a front portion, a crotch portion and a rear portion, and comprises a liquid-permeable top sheet, a liquid-impermeable back sheet and an absorbent core arranged between the top sheet and the back sheet. The top sheet and the back sheet extend beyond the absorbent core to provide the outer boundary region around the absorbent core of the article.

[0008] The outer contour of the absorbent core is defined by mutually symmetrical mirrored portions, which are arranged symmetrically about the longitudinal center line and are defined by a left core edge line and a right core edge line. The absorbent core is further defined by a core leading edge in the front portion and a core trailing edge in the rear portion.

[0009] In certain embodiments, the left-hand portion and the right-hand portion (comprising absorbent cores, top sheet, back sheet, comprising wings) of disposable sanitary article are symmetrical about the longitudinal center line. However, in other embodiments, absorbent cores can be symmetrical about the longitudinal center line, and wings can be provided with an asymmetric mode. In addition, to "mutual symmetry" and "mirror image", it can be understood that each part can be substantially symmetrical, and the tiny or insignificant deviation from a perfect mirror image falls within the scope of the present invention.

[0010] The absorbent core includes a neck region where the transverse width between the left and right core edge lines is smaller than the transverse width of the core in front of the neck region and the transverse width of the core behind the neck region. The portion of the core in front of the neck region is defined as the head region of the core, and the portion of the core behind the neck is defined as the main body portion.

[0011] The disposable sanitary article further comprises at least one asymmetric wing as viewed along any transverse axis of the disposable sanitary article. The asymmetric wing comprises an outer edge extending outwardly from the periphery of the disposable sanitary article, the outer edge extending at a point through the wing junction line J. w The front wing joint and the rear wing joint are connected to the outer periphery of the disposable sanitary article. The outer edge of the asymmetric wing includes the front wing distance point D f Distance from rear wing to point D r , where the front wing distance point will be laterally outboard from the wing joint line J w The lateral distance J1 is 3 mm.

[0012] The absorbent core also includes a first and a second front anastomosis line, the first front anastomosis line being arranged symmetrically with respect to the longitudinal axis or the transverse axis with respect to the second front anastomosis line. The first front anastomosis line extends along a first diagonal axis CL1 extending in the plane of the disposable sanitary article from an outer free end located on or adjacent to the left outer edge toward an inner end located on or adjacent to the longitudinal center line. The second front anastomosis line extends along a second diagonal axis CL2 extending in the plane of the disposable sanitary article from an outer free end located on or adjacent to the left or right outer edge toward an inner end located on or adjacent to the longitudinal center line. The first and second diagonal axes CL1 and CL2 converge at a convergence point C. In addition, the first and second front anastomosis lines have a minimum lateral distance S between their closest paths, wherein the lateral distance S is ≥ 0 mm.

[0013] The at least one asymmetric wing may be formed with an outer edge including a wing positioning profile that coincides with a portion of the outer edge. The wing positioning profile is formed with a base line X wp and perpendicular to the baseline X wp The vertical axis Y wp The wing positioning profile is formed by a wave that extends outward from the front wing junction. The wave consists of a concave curve with a trough and a convex curve with a crest. In addition, the wing positioning profile ends at the end point of the wing positioning profile where the wave no longer coincides with the outer edge. The presence of the trough provides more maneuvering space when folding the wings along the longitudinal side edges of the crotch. The crest of the wing positioning profile provides a "forward direction perception", which is a visual cue that prompts the user to place the disposable sanitary article further forward in the underwear so that the wet point is in the best position relative to the user's anatomy. In addition, the crest of the convex curve provides an intuitive wing manipulation portion that facilitates grasping the wing.

[0014] The front wing distance of at least one asymmetric wing measured along the longitudinal centerline is from point D f The first longitudinal distance D from the convergence point C c It can be between 50-30 mm, preferably between 10-25 mm, and most preferably between 13-20 mm. Such a distance enables the anastomosis line to provide an upward fold that conforms to the user's anatomical structure.

[0015] Wing connecting line J w Corresponding to the wing length, it can be between 50-110 mm, preferably between 75-100 mm, and most preferably between 85-95 mm. Such wing length provides the best balance between the folding of the wing and the prevention of side leakage.

[0016] The presence of the neck region facilitates the shaping of the disposable sanitary article in a manner that more closely matches the user's anatomy, particularly in the crotch and front portions of the article. In particular, the presence of the neck region enhances the curvature of the front portion toward the user's pubic region. In this regard, the width M between the left and right core edge lines in the neck region may be between 30 and 60 mm, preferably between 32 and 42 mm, to provide optimal folding of the disposable sanitary article.

[0017] From the transverse direction T, the front wing joint width W between the left front wing and the right front wing joint fwj It can be between 75-95mm, more preferably between 80-90mm, and most preferably between 85-87mm. rwj It can be between 85-95 mm, more preferably between 87-93 mm, and most preferably between 88-91 mm. The above configuration allows the disposable sanitary article to optimally cover leakage in the crotch. Optionally, the rear wing joining width can be greater than the front wing joining width to more closely conform to the shape of the user's underwear.

[0018] The first and second anterior stapling lines may form at least a first anterior V-shape having two arms extending from outer free ends located at or near the left and right core edge lines toward inner ends located at or near the longitudinal centerline. In this manner, the inner ends are located at the closest approach path V located forward of the outer free ends of the arms. tip1 Such a configuration provides a folding indicator across the entire width of the core neck, thereby further facilitating the head-up folding of the absorbent core to conform to the user's anatomy.

[0019] The core may further include first and second rear seams. The first and second rear seams may form a rear V-shape having two arms extending from outer free ends located on or near the left and right core edge lines to inner ends located on or near the longitudinal centerline A, separated by a distance S ≥ 0 at the closest path behind the outer free ends of the arms. Providing additional seams at the rear of the article may facilitate improved folding of the article during use to better fit the user's body. The combination of the described front and rear seams may be particularly advantageous by providing improved fit to the wearer's anatomy throughout the crotch region.

[0020] The core may further include a third anterior staple line and a fourth anterior staple line forming a second anterior V-shape having two arms extending from outer free ends located on or near the left and right core edge lines to inner ends located on or near the longitudinal centerline A. The closest path V located behind the outer free ends of the arms tip2The distance S is 0. The third and fourth front staple lines cooperate with the first and second front staple lines to provide folding of the article to fit the user's anatomy.

[0021] The first, second, third and fourth anastomotic lines may form two V-shapes, wherein the proximal path V of the inner end of the first front V-shape is tip1 The closest path to the inner end of the second front V-shape V tip2 In this way, a defined folding point is created to more accurately guide the folding of the disposable sanitary article. Alternatively, the tip V of the first front V-shape tip1 and the tip of the second front V-shaped V tip2 The distance D v It may be between 0-10 mm, preferably between 2-6 mm, most preferably between 3-5 mm, to minimize the risk of compression of the absorbent core causing the head to become stiff and thereby affecting the bending properties of the absorbent core.

[0022] The second anterior staple line may extend from an outer free end located on or adjacent to the left outer edge toward an inner end located on or adjacent to the longitudinal centerline.

[0023] The first and second front seaming lines can be grooves or channels having a depth corresponding to 25% or more of the unloaded thickness of the absorbent core, for example, 25% to 100% of the unloaded thickness of the absorbent core, or low-density areas having a density corresponding to 50% or less of the density of the absorbent core, the unloaded thickness or density of the absorbent core being measured in an area of the absorbent core adjacent to the first or second front seaming lines. It has been found that the described construction provides an optimal balance between fluid absorption and the fit of the disposable sanitary article.

[0024] The shape and structure of the core can be further adjusted to optimize fit, absorbency and fluid distribution. For example, the core can be contoured so that it includes a head and two legs extending symmetrically about a centerline in the longitudinal direction of the article.

[0025] The absorbent core may also include a second region that is at least partially surrounded by the first region and wherein the second region has an average density that is lower than the average density of the first region. The average density of the second region may be at least 20%, at least 30%, or most preferably at least 50% lower than the average density of the first region. The lower density in the second region of the core may provide different mechanical properties and different absorbent properties in the region of the core that is in close contact with the user's body.

[0026] Suitably, the two legs can start from a common leg starting point in the crotch and bifurcate, and extend towards the leg ends separated in the rear portion over a portion of the crotch. The second region can extend from the leg starting point to the endpoint in the rear portion between the legs in the horizontal and vertical directions. The distance between the opposite sides of each leg in the horizontal direction can vary in the vertical direction, and the maximum distance between the opposite sides of each leg in the horizontal direction is located at a longitudinal position corresponding to the crotch point position in the crotch. The opposite sides of each leg can converge longitudinally backward so that the distance is reduced to a minimum distance from the maximum distance. In this way, a second region that conforms to the user's anatomical structure can be provided.

[0027] The shape of the at least one asymmetric wing can be further adjusted to optimize the positioning of the disposable sanitary article. For example, when viewed in the longitudinal direction y, the crest of the convex curve of the wing positioning profile can be located in front of the trough of the concave curve. This configuration further emphasizes the "forward orientation," thereby further promoting forward placement of the disposable sanitary article.

[0028] Baseline X of the wave of the wing positioning profile wp It can be placed perpendicular to the longitudinal centerline A of the disposable sanitary article to provide optimal maneuvering space for folding the wings.

[0029] Along the baseline X wp Measure the front wing distance from point D fr The distance W2 from the peak of the convex curve of the wing positioning profile may be between 8 and 30 mm, preferably between 10 and 25 mm, and most preferably between 10 and 20 mm. wp The distance W1 measured between the front wing distance point and the end point of the wing positioning profile may be between 13-35 mm, preferably between 16-25 mm.

[0030] Along the longitudinal axis Y of the wave wp The measured height H between the trough of the concave curve and the peak of the convex curve of the wave may be between 1 and 5 mm.

[0031] The disposable sanitary article can be configured such that the wing defines an imaginary straight line N along a portion of the wing positioning profile, wherein the imaginary straight line N originates from a trough of the concave curve and extends outward, wherein the imaginary straight line N defines an angle θ relative to a straight line w originating from the trough of the concave curve and parallel to the baseline X. wp By extension, the angle θ is between +5 and +25 degrees, preferably between +8 and +20 degrees, and most preferably between +10 and +17 degrees. Alternatively, the angle θ may be between -5 and -25 degrees, preferably between -8 and -20 degrees, and most preferably between -10 and -17 degrees.

[0032] Furthermore, the wings may be formed with an outer edge defining at least one arc of a circle coinciding with a segment of the outer edge and having a defined radius, the segment extending between a first point on the outer edge and a second point along the outer edge at which the arc no longer coincides with the outer edge, and wherein the radius is in the range of 40-500 mm. The presence of the arcuate outer edge minimizes the risk of a user folding one wing over the other during use, thereby causing the adhesive on the first wing to become lodged on the second wing.

[0033] The outer edge may define two or more arcs of a circle, each said arc defining a curvilinear segment and having a defined radius, said first radius and said second radius both being within the range of 40-500 mm.

[0034] Furthermore, the outer edge may comprise at least one straight segment. According to the invention, a straight segment is defined as a segment defining a curved segment with a radius above 600 mm.

[0035] The wings may be configured to define a lower straight line along the lower edge section, wherein the lower straight line is perpendicular to the transverse axis of the longitudinal centerline A. X1 An angle α1 is defined, and the magnitude of the angle α1 can be between 30 and 60 degrees. This enables the creation of wings with a longer wing length, thereby minimizing the risk of leakage along the longitudinal side edges and facilitating a sense of forward direction. In an alternative embodiment, the angle α1 can be between 5 and 30 degrees, which allows for a more defined fold line, making it easier for the user to fold the wings of the disposable sanitary article 1 around the crotch area of the underpants.

[0036] The disposable sanitary article according to the present disclosure may further include a second asymmetric wing viewed along any transverse axis of the disposable sanitary article, wherein the first and second asymmetric wings are asymmetric relative to each other when viewed along the longitudinal centerline. By providing a disposable sanitary article with asymmetric wings as described above, the lateral extension of the fastening wings can be increased without the problem of the wings overlapping each other during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further explained below by way of non-limiting examples and with reference to the accompanying drawings, in which:

[0038] Figure 1 Schematically depicted is a plan view of an exemplary disposable sanitary article according to the present disclosure.

[0039] Figure 2 Schematically illustrated is a plan view of another exemplary disposable sanitary article according to the present disclosure.

[0040] Figure 3AC schematically illustrate plan views of exemplary disposable sanitary articles according to the present disclosure.

[0041] Figure 4 Schematically illustrated is an enlarged view of a portion of an exemplary disposable sanitary article according to the present disclosure.

[0042] Figure 5 Schematically shown is a further enlarged view of a portion of another exemplary disposable sanitary article according to the present disclosure.

[0043] Figure 6 Schematically illustrated is an enlarged view of a portion of another exemplary disposable sanitary article according to the present disclosure.

[0044] Figure 7 Schematically depicted is a plan view of an exemplary disposable sanitary article according to the present disclosure.

[0045] Figure 8 Schematically depicted is a transverse cross-sectional view of an exemplary disposable sanitary article according to the present disclosure. DETAILED DESCRIPTION

[0046] Disposable sanitary articles of the present disclosure are absorbent articles used for personal hygiene and may be, for example, sanitary napkins, panty liners, or incontinence pads. Such articles are typically used to capture and store body secretions, such as urine, feces, or menstrual fluid. An absorbent article is disposable, meaning that it is used only once and then disposed of, rather than being washed and reused. The absorbent article may suitably be a sanitary napkin, and the design of the article is particularly suitable for sanitary napkins.

[0047] Figure 1 A plan view of an article 1 according to the present disclosure is shown. Figure 1 The illustrated article 1 is a sanitary napkin. Article 1 has a transverse direction x, a longitudinal direction y, and a longitudinal centerline A. The longitudinal centerline A divides the article into left and right mirrored halves I and II, which may be symmetrical in shape about the longitudinal centerline. The term "symmetrical about the longitudinal centerline A" means that every point in the article on a first longitudinal portion I on a first side of the longitudinal centerline A has a corresponding point in the article on a second longitudinal portion II on the other side of the longitudinal centerline A; these two points are related to each other by reflection in a plane lying on the longitudinal centerline A.

[0048] The article 1 comprises a front portion 2, a crotch portion 3 and a back portion 4. The article 1 comprises a liquid-permeable topsheet 30, a liquid-impermeable backsheet 31 and an absorbent core 6 disposed between the topsheet 30 and the backsheet 31. The surface areas of the topsheet 30 and the backsheet 31 extend beyond the surface area of the absorbent core 6 to provide an outer boundary region 11 of the article surrounding the absorbent core 6. The outer contour of the absorbent core 6 is defined by mirrored left and right core edge lines 8 and 9, and the absorbent core 6 is defined by a core leading edge 7 in the front portion 2 and a core trailing edge 10 in the back portion 4.

[0049] The front portion 2 includes a pair of front longitudinal side edges 2A and 2B connected by a front end edge 2C. Figure 1 The front longitudinal side edges 2A and 2B are curved and bulge outwardly relative to the longitudinal centerline A so as to conform to the contours of the underpants. Alternatively, the front longitudinal side edges 2A and 2B may be substantially parallel to the longitudinal centerline. Figure 1 , the front edge 2C tapers toward the apex. Similar to the front portion 2, the rear portion 4 also includes a pair of rear longitudinal side edges 4A and 4B connected by a rear end edge 4C. The rear longitudinal side edges 4A and 4B are inclined inwardly toward the crotch portion 3. The middle portion of the rear end edge 4C of the article 1 is convex inwardly. The combination of the apexed front edge 2C and the inwardly convex rear end edge 4C helps users more easily identify the front and rear portions of the article 1 and further minimizes waste when cutting individual articles during manufacturing.

[0050] like Figure 1 As shown, the core 6 includes a neck region 13 having a narrowest transverse width M (measured between the left and right core edge lines (8, 9)) that is narrower than the transverse width of the core in front of the neck region and the transverse width of the core in the back of the neck region (measured between the left and right core edge lines (8, 9)). The narrowest width M is located in the front portion 2 of the core 6, or at the transition portion 5 between the front portion 2 of the core and the crotch portion 3 of the core. The portion of the core in front of the neck region is defined as the head region 14 of the core, and the portion of the core in the back of the neck is defined as the main body portion 15.

[0051] exist Figure 1 In the example, the core 6 consists only of the first region 12. Figure 2 , an exemplary embodiment of the invention will now be described in which the core 6 comprises a first region 12 and a second region 50. The first region 12 is designed and arranged so that it is symmetrical about the longitudinal centerline A of the article 1. This is important so that the article 1 lies symmetrically on the user's body when in use. The first region 12 may have the same outer contour as the absorbent core 6, such as Figure 1 As shown. Figure 1-8 In each of the embodiments shown, the outer edge of the core 6 is identical to the outer edge of the first region 12 .

[0052] The first region 12 comprises a head 14 in the front portion 2 and two leg portions 52, 53. These legs extend symmetrically about the centerline A and in the longitudinal direction y of the article 1, starting from a leg starting point a0 in the crotch portion 3 and extending over a portion of the crotch portion 3 toward separate leg terminations 58, 59 in the back portion 4. The outer contour of the head 14 is defined by two convex lines that are substantially mirror images of each other relative to the longitudinal centerline A. The convex lines converge toward the core rear edge 10 and the first region rear edge 60, thereby defining the "neck" of the first region 12. This means that the narrowest width M of the first portion 12 in the transverse direction x is defined between the left and right first region edge lines 61, 62. The narrowest width M can be located at the transition portion 5, which is the region between the front portion 2 and the crotch portion 3. Alternatively, the narrowest width M can be located in the front portion 2, with the transition portion 5 longitudinally located between the narrowest width M and a transverse line passing through the starting point a0 of the core legs 52 and 53.

[0053] As shown in the drawings, the absorbent core 6 also includes a second region 50. The legs 52 and 53 have opposing sides 54, 55 which, together with the first region rear edge 60, define the outer contour of the second region 50 of the core 6. The second region 50 includes a central region 45 and a rear section 46. Figure 2 , the portions of the opposite sides that are opposite to each other in the rear section 46 are indicated by reference numerals 54' and 55'. There is a distance a in the transverse direction x between the opposite sides 54, 55 of the respective legs 52, 53. x The distance a x The maximum distance a1 in the transverse direction x between the opposite sides 54, 55 of each leg 52, 53 is in the crotch 3. The maximum distance is suitably located at a position in the longitudinal direction y corresponding to the position of the crotch point 80.

[0054] The "crotch point" is defined as the midpoint of the central region 45 which is located in the wet area centered in the crotch portion 3 of the article. The wet area is the area where liquid is initially expected to hit the article. With respect to articles adapted to absorb blood, such as sanitary napkins, it has been found that the crotch point should be located at the point of contact with the vaginal opening. When calculating the average distance, the longitudinal distance between a transverse line drawn between two points at opposite edges 61, 62 of the first region 12 of the core 6 at the point where the first region 12 has its narrowest width M and the crotch point 80 may be approximately 57 mm. This distance is given by Figure 2 Reference symbol d in CPdenoted by . The wet area can then be defined as the area extending symmetrically from the crotch point 80 to the edges of the article 1. For example, in the case of a sanitary napkin, the wet area includes the central region 45 and extends longitudinally by approximately 3-4 cm from the crotch point 80 to the core leading edge 7 and / or the core trailing edge 10, respectively. Laterally, the wet area can extend from the side edge 8 to the side edge 9 of the core 6, but can be narrower. For example, the wet area can have an extension that substantially corresponds to the extension of the central region 45. By providing a maximum width, i.e., a maximum distance, between the legs 52, 53 of the central region 45 at the point of the crotch point 80, improved liquid control can be provided in the wet area.

[0055] The opposite sides 54, 55 of the respective legs 52, 53 converge rearwardly in the longitudinal direction y so that the distance a x The distance a1 between the rear portions 54 ′, 55 ′ decreases from a maximum distance a1 to a minimum distance a2 between the opposite side portions.

[0056] The second region 50 is at least partially surrounded by the first region 12 and extends between the legs 52, 53 in the transverse direction x and the longitudinal direction y from the leg starting point a0 in the crotch portion 3 to the longitudinal end point a defining the extension range of the legs 52, 53 in the back portion 4. l The leg starting point a0 is located in the center line A, thereby providing a symmetrical leg shape in each longitudinal portion I and II. The distance a between the opposite sides 54, 55 of the respective legs 52, 53 in the transverse direction x is x In this way, portions with different extensions in the transverse direction are provided to improve the fit and absorbency of the article. The opposite sides 54, 55 of the respective legs 52, 53 converge rearwardly in the longitudinal direction y towards the rear edge of the article so that the distance a x From said maximum distance a1 it decreases to a minimum distance a2. The minimum distance is preferably located outside the wet area situated in the crotch and in the back part 4 of the article 1.

[0057] The central area 45 of the second region 50 is located in the crotch 3, and the rear section 46 starts from the crotch 3 and extends into the rear 4 of the article 1. The second region 50 is surrounded by the first region 12 except in the area of the first region rear edge 60 of the core 6. The second region 50 suitably covers 10-50%, for example 20-40%, of the total area of the core 6. The second region 50 extends along the center line A between the starting point a0 of the leg and the end point a in the rear 4. lThe length extending between the rear section 46 and the central region 45 can vary widely depending on the size of the article, but can be, for example, 80 to 220 mm. The length of the rear section 46 can vary, for example, from 30 to 110 mm. The length of the central region 45 can vary, for example, from 50 to 110 mm. The rear section 46 has a width or extension in the transverse direction x that is narrower than that of the central region 45 or at least a portion of the central region 45. The rear section 46 can have a lower average density of absorbent material than the central region 45. In addition, the article in the rear section 46 has a lower stiffness than the article in the first region 12. Alternatively, the central region 45 and the rear section 46 can have substantially the same density. Therefore, the stiffness of the central region 45 and the rear section 46 can also be substantially the same.

[0058] The second region 50, which includes a central region 45 extending symmetrically about the center line A, extends longer in the longitudinal direction y than in the transverse direction x. Suitably, the central region has the shape of an ellipse or a parallelogram, the edges of which are located along the center line A and the central region 45 therefore extends longitudinally and symmetrically about the center line A. The second region 50 also includes a rear section 46 extending longitudinally and symmetrically about the center line A. The rear section 46 is in contact with the central region 45 and may overlap with the central region 45. In addition, the rear section 46 is limited by the opposing side faces 54', 55' of the respective legs 52, 53 and the first region rear edge 60. The opposing side faces 54', 55' adjacent to the rear section 46 may be curved or straight and extend generally parallel to each other (e.g. Figure 2 shown).

[0059] Overall, the absorbent core 6 has an asymmetrical shape in the longitudinal extension y, but the first and second longitudinal sections I, II are symmetrical in the transverse extension x about the centerline A. The core 6 can have different shapes, but the core's circumferential edges 8, 9 define a shape in which the head section 13 and at least one neck region (i.e., a region having a smaller width in the transverse direction x) are located in the front portion 2 of the core 6 or in the transition region 5. In this way, the article 1 can better conform to the body shape in the region where the front portion 2 transitions into the crotch portion 3. In practice, this means that the article 1 can bend more easily in the transverse direction x in the neck region. As a result, the front portion 2 and the core head section 14 can bend toward the user, thereby better covering the wearer's pudendal region, while the crotch portion 3 can be positioned adjacent to the female wearer's genital area. Furthermore, the article 1 will better maintain its position during use. The neck region of the core 6 can be the same region as the region where the first region 12 of the core 6 has its narrowest width M, or it can be spaced apart from this region.

[0060] A first and a second front staple line 101, 102 are provided in the core 6. The first front staple line 101 extends from the left core edge line 8 or approximately the left core edge line 8 towards the longitudinal center line A along a first diagonal axis CL1 extending in the plane of the disposable sanitary article. The second front staple line 102 extends from the right core edge line 9 or approximately the right core edge line 9 towards the longitudinal center line A along a second diagonal axis CL2 extending in the plane of the disposable sanitary article. Figure 1 As shown, the first and second diagonal axes (CL1, CL2) converge at a convergence point C. The first and second diagonal axes CL1 and CL2 are positioned perpendicular to each other so that the convergence point is located on the longitudinal centerline A. The first and second anterior stapling lines are arranged symmetrically relative to each other and as seen along the centerline A. The outer free end of the first anterior stapling line 101 is located at or adjacent to the left core edge line 8 of the core 6, to the left of the longitudinal centerline A and behind the narrowest width M. The inner end of the first anterior stapling line 101 is located in front of the outer free end, but behind the narrowest width M. Alternatively, the inner end can be located on or in front of the narrowest width M. Figure 1 In the embodiment, the first front seam line 101 extends only in the left portion of the article 1, is located to the left of the center line, and does not cross or intersect the center line A.

[0061] like Figure 1 As shown, the second front seam line 102 is configured as a mirror image of the first seam line 101. Therefore, the outer free end of the second front seam line 102 is located at or adjacent to the right core edge line 9 of the absorbent core 6, to the right of the longitudinal centerline A and behind the narrowest width M. The inner end is located in front of the outer free end but behind the narrowest width M. Alternatively, the inner end may be located on or in front of the narrowest width M. Figure 1 In the embodiment, the second front anastomosis line extends only to the right side of the article 1, that is, to the right of the center line, and does not cross or intersect with the center line A.

[0062] like Figure 1 As shown, the first and second staple lines 101, 102 are spaced apart from each other by a minimum distance S at the closest point between their respective inner ends. The minimum distance S between the first and second staple lines 101, 102 provides a spacing or gap between the lines. The gap between the lines ensures that fluid can flow in a controlled manner in a forward direction without being hindered by the staple lines extending across the entire width of the core. In addition, by providing space between the staple lines 101, 102, potential weaknesses caused by overlapping staple lines are avoided. The minimum distance S can be at least 1 mm, more preferably at least 2 mm, and more preferably at least 3 mm. The minimum distance S can be further less than 20 mm, more preferably less than 10 mm.

[0063] An advantage of the present disclosure is that the first and second anastomosis lines 101, 102 provide for preferential folding of the article in a controlled manner. For example, during use, the transition portion 5 or transition region 5 of the absorbent article 1 is positioned between tendons. Transverse compression of the longitudinal core side edges between the user's thighs causes the article to wrinkle or fold. In articles comprising a core of uniform density and thickness, folding of the article occurs in an uncontrolled or unpredictable manner. When the article folds, wrinkles or channels may form that extend toward the edges of the article, potentially leading to leaks.

[0064] By providing a staple line, the article can be folded or deformed along the staple line when compressed, and the position of the folds and creases can be controlled to minimize the risk of leakage. However, the position of the staple line should be carefully considered to avoid unduly compromising other properties of the article. For example, the staple line should not weaken the structure of the article to the extent that it is easily torn. In an embodiment of the present disclosure, the first and second staple lines 101, 102 provide preferential folding of the article towards the edge of the core 6 in a controlled manner. In particular, the lateral compression of the left and right core edge lines 8, 9 of the core between the tendons allows the front portion 2 to fold upward along the staple lines 101, 102 in a forward direction toward the user's body. This allows the article 1 to fit more tightly and securely.

[0065] The first and second anastomosis lines 101, 102 (and any additional anastomosis lines) can be provided by compressing the core 6 and the optional liquid acquisition sheet 37 and / or the top sheet 30 with high pressure compression from either the top sheet 30 or the back sheet side (or both) of the article to form grooves or lines. The anastomosis lines can also be created by removing pulp from the anastomosis lines to create so-called "channels." In addition, a combination of the above techniques can be used, for example by forming channels and compressing the core. The back sheet of the article can remain untreated, and the liquid impermeability of the back sheet is not affected and can be maintained.

[0066] The positioning of the staple lines 101, 102 can be selected based on the anatomy of a typical user and adjusted based on different user groups or different product uses. The size can also be adjusted based on the size and shape of the absorbent article into which the staple line is incorporated. Therefore, the sizes provided above are based on Figure 1 The exemplary dimensions of the exemplary product shown, and the first and second staple lines of the present invention may be implemented in a manner that deviates from the exemplary preferred embodiment described above.

[0067] exist Figure 2In the embodiment of the present invention, the rear seam lines 201 and 202 extend from a front end point at or near the outer edge of the first region 12 of the core 6 to a rear end point at the inwardly facing sides 54', 55' (inner edges) of the legs 52, 53. Providing additional seams at the rear of the article 1 can facilitate improved folding of the article during use to better fit the user's body. The combination of the front and rear seam lines described can be particularly advantageous by providing improved conformity to the wearer's anatomy throughout the crotch region. Figure 2 The posterior staple lines 201, 202 in the embodiment are straight and angled with respect to each other as they move away from each other. However, one skilled in the art will appreciate that the posterior staple lines extending away from each other may be provided by curved posterior staple lines. Figure 2 The posterior anastomotic lines in the are mirror images of each other as viewed along the longitudinal centerline.

[0068] refer to Figure 3 A-3C describes further exemplary embodiments of first and second staple lines. Figure 3 In A, the first and second front staple lines 101, 102 form a first V-shape having two arms extending from outer free ends located near the longitudinal core edge lines (8, 9) toward the longitudinal centerline so that the inner ends are at points V located on the longitudinal centerline and forward of the outer free ends of the arms. tip1 Converge at. Figure 3 The absorbent core 6 in A further comprises a second pair of front seaming lines 103, 104 forming a second V-shape having two arms extending from outer free ends located adjacent to the longitudinal core edge lines (8, 9) towards the longitudinal centerline such that the inner ends are at a point V located on the longitudinal centerline and positioned behind the outer free ends of the arms. tip2 The tips of the first and second V-shapes are spaced apart so that the tip of the first V-shape V tip1 With the tip of the second V-shaped V tip2 The distance Dv therebetween is between 0-10 mm, preferably between 2-6 mm, and most preferably between 3-5 mm.

[0069] exist Figure 3 In the alternative embodiment shown in C, the inner end of the first V-shape and the inner end of the second V-shape both terminate at a junction, so that tip1 and V tip2 In this way, the first and second pairs of anterior anastomotic lines form a cross. Figure 3 C, V tip1 =V tip2 Due to the presence of the head in the core region, the outer free ends of the second pair of anterior staple lines are further extended in the transverse direction than the outer free ends of the first pair of anterior staple lines.

[0070] exist Figure 3 In another embodiment shown in B, the first and second pairs of anterior staple lines are arranged symmetrically relative to each other along the transverse axis. The inner end of the first anterior staple line 101 is located at or near the longitudinal centerline A, but behind the narrowest width M. The outer end of the first anterior staple line is located on or near the left longitudinal core edge 8. The second anterior staple line 102 is configured as a mirror image of the first staple line 101 as seen along the transverse axis. Therefore, the inner end of the second anterior staple line 102 is located at or near the longitudinal centerline A, but behind the narrowest width M. The outer end of the second anterior staple line is located on or near the left longitudinal core edge x, wherein the second anterior staple line 102 is located in front of the first staple line 101. Therefore, the first and second anterior staple lines 101, 102 form a first V-shape, with Figure 3 Compared to the first V-shape shown in A, this V-shape is rotated 90 degrees. Figure 3 In Figure C, the core 6 includes a second pair of anterior staple lines 103, 104 forming a second V-shape, wherein the outer end of the third anterior staple line 103 is located on or near the right longitudinal core edge 9, and the inner end of the third anterior staple line 103 is located at or near the longitudinal centerline A to form a first arm. Similarly, the outer end of the fourth anterior staple line 104 is located at or near the right longitudinal core edge 9, and the inner end of the fourth anterior staple line 104 is located at or near the longitudinal centerline A to form a second arm.

[0071] To be clear, reference Figure 1-3 The depicted staplers 101 , 102 may take different forms and may provide additional advantages when combined with specific core structures.

[0072] Look again Figure 1 The article 1 further comprises a left wing 16 and a right wing 17 extending outwardly from the longitudinal side edges (8, 9) of the periphery 18 of the disposable sanitary article 1. Figure 4 As shown, the outer edges of the left and right wings meet the outer periphery 18 of the disposable sanitary article 1 at the front of the crotch region 3 at the left front wing joint 19 and the right front wing joint 20, respectively. At the rear of the crotch region 3, the outer edges of the left and right wings 16 and 17 meet the outer periphery 18 of the disposable sanitary article at the left and right rear wing joints 21 and 22, respectively.

[0073] In the context of this application, the front wing joints 19, 20 and the rear wing joints 21, 22 are defined as follows and with reference to Figure 4 In the crotch portion 3, draw an imaginary vertical straight line Z L , Z R , so that it contacts the periphery 18 in the transverse direction of the disposable sanitary article 1 at the narrowest width Q in front of the left wing 16 and the right wing 17. The imaginary straight line Z in front of the left wing 16 LThe intersection point between the left front wing and the outer periphery 18 is defined as the left front wing joint 19, and the imaginary straight line Z in front of the right wing 17 is defined as R The intersection point between the right front wing and the outer periphery 18 is defined as the right front wing joint 20. L 、Z R In embodiments coinciding with the longitudinal side edges of the periphery 18 (e.g., because the longitudinal side edges of the periphery consist of straight lines), the front wing joints 19 and 20 are defined as points located on the portion of the imaginary straight line coinciding with the periphery, closest to the wings of the disposable sanitary article in the forward direction. By drawing an imaginary longitudinal straight line V L 、V R The left and right wings 16 and 17 are connected to the outer periphery 18 at the narrowest width R in the transverse direction of the disposable sanitary article 1 to define the rear wing joints 21 and 22. L The intersection point between the left rear wing and the outer periphery 18 is defined as the left rear wing joint 21, and the imaginary straight line V behind the right wing 17 is defined as R The intersection point between the right rear wing and the outer periphery 18 is defined as the right rear wing joint 22. L 、V R In embodiments coinciding with the longitudinal side edges of the periphery 18 (e.g., because the longitudinal side edges of the periphery consist of straight lines), the rear wing joints 21 and 22 are defined as points located on the portion of the imaginary straight line coinciding with the periphery, closest to the wings of the disposable sanitary article in the rearward direction. Figure 4 As shown, the imaginary left wing joint line J wL Connecting the left front wing joint 19 and the left rear wing joint 21, the imaginary right wing joint line J wR Connects the right front wing joint 20 and the right rear wing joint 22. In the context of this application, the left and right wing joint lines J wL and J wR Corresponding to the wing length. In sanitary napkins of the type shown, the rear wing joints 21, 22 are spaced further outboard of the longitudinal centerline than the front wing joints 19, 20. Thus, the left and right wing joint lines J wL and J wR are not parallel to the longitudinal centerline A. However, the rear wing joints 21, 22 may also be spaced such that the lateral distance between the rear wing joints 21, 22 and the longitudinal centerline A is equal to the lateral distance between the front wing joints 19, 20 and the longitudinal centerline A. In such an embodiment, the left and right wing joint lines J wL and J wR Parallel to the longitudinal centerline A. In the sanitary napkin of the type shown, the left flap seam line J wL and right wing junction line J wR The length is 50-110 mm, preferably between 75-100 mm, most preferably between 85-95 mm.

[0074] The left wing 16 and the right wing 17 also include a front wing distance point D located on the outer edge 38 of the left wing 16 and the left wing 17. fl 、D fr Distance from rear wing to point D rl 、D rr The distance between the front and rear wings is the distance between the point on the outside and the left wing joint line J wL To determine the position of the front and rear wing distance points, proceed as follows: At the corresponding wing joint line J wL 、J wR Draw a line parallel to the wing joint line J at a distance of 3mm outside J1 wL 、J wR The imaginary line K L , K R . Imaginary line K L , K R The intersection points with the outer edges 38 on the front sides of the left and right wings respectively determine the left front wing distance point D fl Distance from right front wing to point D fr Similarly, the imaginary line K L , K R The intersection points with the outer edges 38 on the rear sides of the left and right wings respectively determine the distance points D between the left and right rear wings. rl 、D rr .

[0075] The presence of the neck region 13 allows the disposable sanitary article 1 to bend more easily in the neck region in the transverse direction x. Since the left and right flaps 16 and 17 secure the disposable sanitary article 1 in the crotch region of the user's underwear, the left and right front flaps are at a distance from point D fl 、D fr The position relative to the neck determines the position of the neck in the user's underwear. Figure 4 As shown, the distance between the left front wing and the right front wing is point D fl 、D fr The neck region 13 of the absorbent core 6 is spaced apart in the rear longitudinal direction by a first longitudinal distance D1. In sanitary napkins of the type shown, the distance D1 is between 5 and 30 mm, more preferably between 10 and 20 mm. Such a configuration enables the disposable sanitary article 1 to better conform to the user's body shape in the area where the front portion 2 transitions to the crotch portion 3. In embodiments where the neck region 13 comprises straight left and right core edge lines (8, 9) so that the neck extends in the longitudinal direction, the distance D1 is based on the distance D1 of the neck region closest to the front wing in the longitudinal direction. fl 、D fr Typically, the width M between the left core edge line and the right core edge line in the neck region is between 30-60 mm, preferably between 32-42 mm.

[0076] The crotch portion 3 of the article 1 is located near the front portion 2 in the longitudinal direction. In use, the crotch portion 3 is located between the user's legs and covers the genital area of the female user. Figure 1 and Figure 2 In the sanitary napkin of the type shown, the length b2 of the crotch portion 3 in the longitudinal direction accounts for between 25-60% of the total length b of the article, more preferably between 30-55%, and most preferably between 30-50%. Typically, the length b2 of the crotch portion 3 in the longitudinal direction y is between 60-150 mm, for example, between 80-120 mm. Figure 1 As shown, the front wing joint width W of the disposable sanitary article 1 is measured in the transverse direction between the left and right front wing joints. fwj , which is between 75-95 mm, more preferably between 80-90 mm, and most preferably between 85-87 mm. The disposable sanitary article 1 also has a rear wing joint width W measured in the transverse direction between the left and right rear wing joints 21, 22. rwj , which is between 85-95 mm, more preferably between 87-93 mm, and most preferably between 88-91 mm.

[0077] Figure 1 The disposable sanitary article 1 in the embodiment of the present invention comprises a left wing 16 and a right wing 17, the shapes of which are asymmetrical with respect to any transverse axis extending in the transverse direction. Figure 2 , the left wing 16 and the right wing 17 may also be formed asymmetrically relative to each other along the longitudinal center line (A). Figure 2 The left wing 16 and the right wing 17 are furthermore arranged symmetrically to each other along a diagonal axis extending in the plane of the sanitary article in the direction D and at an angle α in the range of 10° to 65°, for example in the range of 30° to 55°, relative to the longitudinal center line A of the disposable sanitary article 1. Figure 2 As shown, if the left wing 16 is rotated 180°, the left wing 16 may be a mirror image of the right wing 17 .

[0078] Figure 5 The right wing in FIG is formed by an outer edge 38 including a wing positioning profile 24 that coincides with a section of the outer edge. The wing positioning profile is formed by a wave starting from the right front wing joint 20 and extending outwards, the wave consisting of a concave curve with a trough 25 and a subsequent convex curve with a crest 26. The wave has a base line X wp and perpendicular to the baseline X wp The longitudinal axis Y wp The wing locating profile 24 ends at a wing locating profile end point 27 where the wave no longer coincides with the outer edge 38. Figure 5 As shown, the wing positioning profile endpoint 27 is defined as the intersection of the wing outer edge 38 and a straight line w, which is parallel to the baseline X starting from the trough of the concave curve. wpThe concave curve and the convex curve may have the same wavelength and amplitude, or the wavelength and amplitude of the concave curve and the convex curve may be different. Figure 5 In the figure, the crest 26 of the convex curve is located in front of the trough 25 when viewed from the longitudinal direction y. fr and the wing positioning profile between the peaks 26 of the convex curve along the baseline X wp The measured distance W2 is between 10-30 mm, preferably between 10-25 mm, and most preferably between 12-22 mm. wp Measure the front wing distance from point D fr The distance W1 from the wing positioning profile end point 27 is between 15-35 mm, preferably between 18-28 mm. Figure 5 As shown, the wing positioning profile 24 also has a wp The height H is measured between the trough 25 of the concave curve and the peak 26 of the convex curve. In sanitary napkins of the type shown, the height H is between 1 and 5 mm.

[0079] exist Figure 6 In FIG. 1 , the wing 17 defines an imaginary straight line N along a portion of the wing positioning profile 24. The imaginary straight line N starts from the trough 25 of the wave and extends outward along a portion of the wing positioning profile 24, thereby defining an angle θ relative to a straight line w, which is parallel to the baseline (transverse axis) X starting from the trough of the concave curve. wp By extension, the magnitude of the angle θ is between +5 degrees and +25 degrees, preferably between +8 degrees and +20 degrees, and most preferably between +10 degrees and +17 degrees. Alternatively, the angle θ may have a negative magnitude between -5 degrees and -25 degrees, preferably between -8 degrees and -20 degrees, and most preferably between -10 degrees and -17 degrees.

[0080] exist Figure 6 In the figure, an imaginary straight line 40a is drawn from the rear wing to point D rr The rear section 40 begins along the outer edge of the wing 17 and extends in an outward direction. An imaginary straight line 40a extends relative to the point D through the rear wing. rr The transverse axis X1, which runs perpendicular to the longitudinal centerline A, defines an angle α1. In sanitary napkins of the type shown, the angle is between 30 and 60 degrees, thereby allowing the formation of wings with longer longitudinal side edges while promoting optimal placement of the sanitary napkin in underwear. In addition, the longer longitudinal side edges provide better protection against leakage along the longitudinal side edges of the disposable sanitary article 1. Figure 6 In the figure, the rear wing of the wing positioning profile is at a distance from point D rrThe defined angle α1 and the angle θ defined by the trough 25 are both between 30 and 60 degrees, creating a perception of a forward direction. This perception of a forward direction serves as a visual cue for the user to position the disposable sanitary article 1 closer to the front of the underwear, thereby aligning the wetness point with the user. However, the angle α1 can also be between 5 and 30 degrees, providing a more defined fold line, making it easier for the user to fold the wings of the disposable sanitary article 1 around the crotch area of the underwear.

[0081] Figure 7 The outer edge 38 of the center wing 17 comprises a rounded section 301a consisting of a portion having a defined radius r a The arc 300a of a circle is formed coinciding with the rounded section 301a. The rounded section 301a extends between a first point 290a of the outer edge 38 and a second point 320a along said outer edge 38 where the arc 300a no longer coincides with the outer edge 38. In the sanitary napkin of the type shown, the radius r a In the range of 40-500mm. Figure 7 As shown, the outer edge 38 of the wing 17 may further include a second rounded section 301b. Figure 4 The second rounded section 301b in the embodiment is formed by a rounded section having a defined radius r b The arc 300b of a circle that coincides with the rounded portion 301b is formed. The second rounded portion 301b extends between the first point 290b of the outer edge 38 and the second point 320b at which the arc 300b no longer coincides with the outer edge 38. The radii of the first and second arcs are both within the range of 40-500 mm. Figure 7 , the outer edge 38 of the wing 17 also includes a straight segment 36. The outer edge 38 may further include additional straight segments.

[0082] Typically, each fastening flap (referred to in this disclosure as a "wing") 16 and 17 is provided with at least one fastening means in the form of an adhesive area applied on the underside of each flap 16, 17, ie on the side not facing the wearer.

[0083] The advantages of the present invention can be achieved with minimal disruption or modification to known manufacturing techniques. In a production method suitable for manufacturing an article according to the present invention, a liquid permeable top sheet material layer, a liquid impermeable back sheet material layer and an absorbent material layer are fed into a manufacturing apparatus. A core is arranged to be located between the top sheet material layer and the back sheet material layer. An optional acquisition material layer is arranged to be positioned between the top sheet material layer and the absorbent material layer. Figure 1 In the embodiment of the present invention, the backsheet is designated as reference numeral 31 and the topsheet is designated as reference numeral 30. The absorbent core is given reference numeral 6. Suitable materials for the backsheet, the topsheet 30 and the absorbent core will be apparent to those skilled in the art.

[0084] The disposable sanitary article of the present invention includes an absorbent core, which is represented by the reference numeral 6 in the accompanying drawings. The "absorbent core" is the absorbent structure of the article for obtaining and storing body fluids. The absorbent core can be of any conventional type. Examples of common absorbent materials are cellulose fluff pulp, tissue paper, highly absorbent polymers (so-called superabsorbents), absorbent foam materials, absorbent nonwoven materials, etc. It is very common to combine cellulose fluff pulp with superabsorbent polymers in the absorbent core. Superabsorbent polymers are water-swellable, water-insoluble organic or inorganic materials that can absorb at least about 20 times their own weight in an aqueous solution containing 0.9% by weight sodium chloride. Organic materials suitable for use as superabsorbent materials can include natural materials, such as polysaccharides, polypeptides, etc., as well as synthetic materials, such as synthetic hydrogel polymers. Such hydrogel polymers include, for example, alkali metal salts of polyacrylic acid, polyacrylamide, polyvinyl alcohol, polyacrylates, polyacrylamide, polyvinyl pyridine, etc. Other suitable polymers include hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, and isobutylene-maleic anhydride copolymers and mixtures thereof. The hydrogel polymer is preferably slightly cross-linked so that the material is substantially insoluble in water. The preferred superabsorbent material is further surface cross-linked so that the outer surface or shell of superabsorbent particles, fibers, flakes, spheres, etc. has a cross-linking density higher than the inside of the superabsorbent. Superabsorbent material can be any form suitable for absorbent composite materials, including particles, fibers, flakes, spheres, etc. High absorption capacity is provided by using a large amount of superabsorbent materials. Common thin absorbent cores in, for example, sanitary towels, baby diapers, and incontinence protection articles generally include a compression, mixing, or layered structure of cellulose fluff pulp and superabsorbent polymers. The size and absorption capacity of the absorbent core can vary to adapt to different product types, such as sanitary towels or panty liners for adult incontinent people.

[0085] In general, the core can be a one-piece structure, thereby, for example, can simplify the manufacturing process. The phrase "one-piece structure" in this context is intended to mean that the absorbent core is basically made of one type of material, which is basically the same material, or is basically the same combination of two or more materials in the whole absorbent core. The density and concentration of the material may change, but these changes are limited to the changes that can be obtained when the regions that are formed separately and then physically connected are not merged. 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 fiber can be different in different parts of the core. However, the absorbent core of one-piece structure does not include layers or laminates of different components. Equally, in the longitudinal, transverse or thickness direction of the absorbent core, the variation of the density or concentration of the various components is acceptable, but the core should not include regions or layers of different components that are formed separately and subsequently joined together.

[0086] A suitable technique for making the absorbent cores of the present disclosure is pad forming by an air-laid process. In this process, a breathable mold is provided. The fibrous material is air-laid into the mold, and the mold is filled, thereby producing an absorbent core having the desired amount of fibrous material.

[0087] In general, the absorbent core 6 has an asymmetrical shape in the longitudinal extension y, but the first and second longitudinal portions I, II are symmetrical about the centre line A in the transverse extension x. The core 6 may have a different shape, but the circumferential edges 8, 9 of the core define a shape in which the head 14 and at least one neck region (i.e. a region having a smaller width in the transverse direction x) are located in the front part 2 or in the transition region 5 of the core 6. In this way, the article 1 can better conform to the shape of the body in the region where the front 2 transitions into the crotch 3. In practice, this means that the article 1 can bend more easily in the transverse direction x in the neck region. Thus, the front part 2 and the core head 13 can be bent towards the user, so that the front part 2 can better cover the wearer's pudendal area, while the crotch 3 can be close to the genital area of the female wearer. Furthermore, the article 1 will better remain in its position during use. Furthermore, with reference again to Figure 2 Because the width M of the neck substantially corresponds to the distance between the two tendons on the wearer's body, the absorbent article 1 can be securely fixed during use using the narrowest width M between the tendons, or the transition zone 5, and maintained in this position. Consequently, the front portion 2 of the article 1 is retained in the area in front of the aforementioned tendons, while the crotch portion 3 of the article 1 is effectively and correctly positioned against the wearer's genitals. This helps avoid problems associated with incorrect placement of the absorbent article 1 or movement of the article 1 during wear. In this way, the article 1 is prevented from moving backwards between the wearer's legs. This is a common problem with conventional sanitary napkins, even when secured to underwear during use, as the wearer's leg movements often cause the sanitary napkin to move backwards.

[0088] After preparation absorbent cores 6, can it be carried out pattern compression, thereby prepare the absorbent cores with different density regions.Compression can use any known mode to carry out.The average density of fibrous material in low compression or non-compression absorbent cores corresponds to the average density of absorbent cores in lower average density region (i.e. second region 50).Then, outside these regions, the absorbent cores promptly in first region 12 are compressed, and in these regions, core keeps uncompressed.

[0089] Thus, the first region of the core is compressed more than the second region. Alternatively or additionally, the first region can be embossed to provide only higher compression or to further increase the degree of compression achieved by compression. If compression and embossing are separate steps, the section providing the first region can be compressed simultaneously with or subsequent to the embossing step of the embossing pattern. The embossing pattern is preferably visible through the topsheet. Compression and embossing can be performed on either the topsheet or the backsheet side of the core.

[0090] Figure 8 Shown Figure 1-7 A cross-sectional view of the item in the image. Figure 8 The cross-sectional view of FIG clearly shows the top sheet 30, the bottom sheet 31 and the core 6 arranged therebetween. The liquid acquisition sheet 37 is arranged between the core 6 and the top sheet 30. Preferably, as Figure 2 and Figure 3 As shown, the liquid acquisition sheet 37 has a significant extension in both the transverse x and longitudinal y directions of the core 6. This allows for a soft side edge section. Preferably, the liquid acquisition sheet extends approximately 1-15 mm beyond the outer edge of the core 6. This means that the core is completely covered by the liquid acquisition sheet. Because the liquid acquisition sheet 37 creates a quick entry point for capturing liquid within the product, leakage control is achieved. For example, at least a portion of the menstrual fluid in the area outside the core is captured, preventing it from leaking outside the sanitary article 1. In alternative embodiments, the liquid acquisition sheet 37 can be omitted.

[0091] The absorbent article 1 according to the present disclosure may include a liquid acquisition sheet 37 used as a liquid distribution layer. The acquisition layer 37 can have different shapes and can be adjusted to suit the shape of the absorbent core. The acquisition layer 37 can extend 1-15 mm beyond the outer edge of the core 6 (preferably around the entire periphery of the core 6). In some embodiments, the acquisition layer 37 can extend up to 50 mm in certain areas of the absorbent article 1. This construction can provide a neat edge at the periphery of the article. The liquid acquisition sheet 37 is located between the top sheet 30 and the core 6 and is appropriately placed on top of the absorbent core. The liquid acquisition sheet 37 is suitable for quickly receiving and temporarily storing discharged liquid before the discharged liquid is absorbed by the absorbent core 6. Such an acquisition distribution layer can be composed of, for example, an air-laid nonwoven fabric, a spunlace nonwoven fabric, a high-loft nonwoven fabric or a foam material. The nonwoven material can be hydrophilic. Hydrophilic materials can be obtained by adding surfactants.

[0092] Airlaid nonwovens can be produced from fluff, wood pulp, where the fluff fibers are dispersed in a fast-moving air stream and condensed onto a moving screen by pressure and vacuum. The web can be bonded with a resin and / or thermoplastic resin dispersed in the pulp. The web can be thermally bonded (via heat), latex-bonded (via adhesives), multi-bonded (a combination of thermal and latex bonding), or mechanically bonded (high compression and high temperature, via hydrogen bonding). The grammage of the airlaid nonwoven can suitably be 50 to 100 gsm.

[0093] High loft materials are nonwoven materials and may be substantially free of absorbent fibers and superabsorbent materials. High loft nonwoven materials may comprise thermoplastic polymer fibers and may be selected from, but not limited to, polyesters, polyamides, and polyolefins, such as polyethylene (PE) and polypropylene (PP), and may be any mixture of these. High loft refers to a low-density, fluffy fabric compared to a flat, paper-like fabric. High loft webs are characterized by a relatively low density. This means that there is a relatively high amount of void space between the fibers. The high loft nonwoven fiber layer of the present invention may typically have a density of less than 0.200 g / cc (200 kg / m 3 ) density, particularly in the range of 0.015 g / cc to 0.150 g / cc (15 kg / m3 to 150 kg / m 3 ), especially 0.030 g / cc to 0.100 g / cc (30 to 100 kg / m 3 ) in the range of, for example, 0.065 g / cc (65 kg / m 3). The average density can be calculated by dividing the basis weight of the high loft layer by the thickness measured at a pressure of 0.5 kPa (see method details below). Typically, the high loft material has a thickness greater than about 0.5 mm, for example greater than 1 mm or appropriately 1.5–2.0 mm, and has a low solids content, typically less than 15% by volume. The high loft nonwoven layer can advantageously be a spunmelt nonwoven material. Spunmelt is a general term that describes the manufacture of nonwoven webs directly from thermoplastic polymers. It covers two processes and a combination of the two: spinning (also called spunbond) nonwovens and meltblown nonwovens. In the spinning process, polymer particles are melted and the molten polymer is extruded through a spinneret. The continuous filaments are cooled and deposited on a conveyor to form a uniform web. Some residual temperature can cause the filaments to adhere to each other, but this cannot be considered the primary bonding method. The advantage of the spunbond process is that it imparts greater strength to the nonwoven, but the flexibility of the raw material is more limited. Coextrusion of a second component is used in several spunbond processes, usually to provide additional properties or bonding capabilities. In the meltblown web formation process, a low viscosity polymer is extruded into a high velocity air stream upon leaving the spinneret. This disperses the melt, solidifies it, and separates it into fiber webs. The liquid collection sheet can be a spunbond material, and can be a spunbond-fusion-spunbond (SMS) material. The high bulk nonwoven layer can in particular have a thickness of 0.30 mm to 2.00 mm measured at a pressure of 0.5 kPa, for example 1.0 mm (according to the test method mentioned in PCT application PCT / SE2017 / 050612). The grammage, i.e., basis weight, of the high bulk material can for example be in the range of 15 gsm to 500 gsm, in particular 30 gsm to 200 gsm, such as 30-90 gsm, for example 64 gsm.

[0094] According to another variation, the liquid acquisition sheet 37 is a hydroentangled (also known as spunbond) nonwoven material. Hydroentangled nonwoven products are derived from the process of entangling a loose fiber web under high pressure by multiple water jets; this process entangles the fabric and interconnects the fibers. Hydroentangled nonwovens or hydroentangled are referred to by several terms, such as air-entangled, needle-punched, hydroentangled, or hydro-entangled, but hydroentangled is the most popular term in the nonwovens industry. The raw material of the acquisition sheet can be polypropylene (PP), polyethylene (PE), polyester (PET), polyamide (PA), cellulose fibers, or a combination of these fibers, and different weights and compositions are possible, such as viscose, polyester, cotton, nylon, and microfibers, with viscose being the most commonly used raw material. Therefore, if a combination of different fibers is used, this can be a mixture of fibers from different polymers, although each fiber can also include a different polymer (e.g., PP / PE bicomponent fibers or PP / PE copolymers). Where appropriate, the plastic film can be composed of PE or PP, PET, PLA, or amyl (or, for that matter, any other thermoplastic polymer), or a mixture or copolymer of the above polymers. Spunlace materials typically include polypropylene or polyethylene fibers, which provide optimal comfort for nonwoven materials. Other suitable fibers for making nonwoven materials are, for example, natural fibers such as bamboo, cotton, and linen. Spunlace nonwoven materials typically have a grammage of 30-80 gsm.

[0095] Top sheet can comprise or be made up of the fiber nonwoven layer of spunbond, melt-blown, carding, spunlace, wet laying.Suitable nonwoven material can be made up of natural fiber, for example wood pulp or cotton fiber, synthetic thermoplastic fiber for example polyolefin, polyester, polyamide and mixture and combination thereof, or be made up of the mixture of natural fiber and synthetic fiber.The material that is suitable as top sheet material should be soft, has no irritation to skin, and is easy to be penetrated by body fluid (such as menstrual fluid and urine).

[0096] Backsheet can be made up of thin plastic film such as polyethylene or polypropylene film, nonwoven material coated with liquid impermeable material, hydrophobic nonwoven material of resistance liquid penetration. Laminated materials of plastic film and nonwoven material can also be used. Backsheet material can be breathable, to allow steam to escape from the absorbent structure, while still preventing liquid from passing through the backsheet material.

[0097] The wings may consist of a separate material attached to the longitudinal side edges (8, 9) of the periphery 18 of the disposable sanitary article 1. Suitable materials may be any of the materials listed above in connection with the topsheet and backsheet. Alternatively, the wings may consist of extensions of the topsheet or backsheet material or both.

[0098] Although not shown in the figures, the absorbent article 1 described above may include any attachment means known in the art to allow fastening to the wearer's underwear. Such means may include an adhesive coating or a friction coating on the surface of the article facing the garment. In addition, the article 1 according to the present invention includes attachment flaps ("wings") that extend in the transverse direction of the article 1 and are intended to be placed around the crotch of the wearer's underwear. However, it is important that the nature and location of such attachment means do not significantly interfere with the function of the article 1 during use.

[0099] Therefore, according to the sanitary article of the present disclosure, adhesive can be provided on the back sheet, for example, pressure-sensitive adhesive. Elongated packaging sheet can be releasably adhered to the back sheet with adhesive of the sanitary article. The packaging sheet can be coated with a material such as silicone that can release the packaging sheet so that the packaging sheet can be peeled off from the back sheet with adhesive of the sanitary article, and the sanitary article can be attached to underwear. The region with adhesive of the back sheet can also be covered with release paper. The release paper can, for example, be attached to the packaging sheet by permanent attachment so that the sanitary article is attached to the packaging sheet via the release paper.

Claims

1. A disposable sanitary article (1) having a transverse (x), a longitudinal (y) direction and a longitudinal centre line (A) dividing the article into a left-hand portion (I) and a right-hand portion (II), wherein the article has a front portion (2), a crotch portion (3) and a back portion (4), and the article comprises a liquid-permeable top sheet (30), a liquid-impermeable back sheet (31) and an absorbent core (6) arranged between the top sheet (30) and the back sheet (31); wherein the top sheet (30) and the back sheet (31) extend beyond the absorbent core (6) to provide an outer boundary region (11) of the article surrounding the absorbent core (6); wherein the outer contour of the absorbent core is defined by mutually symmetrical mirrored portions arranged symmetrically about the longitudinal center line (A) and by a left core edge line (8) and a right core edge line (9), the absorbent core extending between a core leading edge (7) in the front portion (2) and a core trailing edge (10) in the rear portion (4), in, The absorbent core (6) comprises a neck region (13), wherein a transverse width (M) between the left core edge line (8) and the right core edge line (9) at the neck region is smaller than a transverse width of the absorbent core in front of the neck region (13) and a transverse width of the absorbent core in rear of the neck region (13), wherein a portion of the absorbent core in front of the neck region (13) is defined as a head region (14) of the absorbent core (6), and a portion of the absorbent core (6) in rear of the neck region (13) is defined as a main body portion (15); wherein the article further comprises at least one asymmetric wing as viewed along any transverse axis of the disposable sanitary article, the asymmetric wing comprising an outer edge (38) extending outwardly from the periphery (18) of the disposable sanitary article (1), wherein the outer edge (38) of the at least one asymmetric wing is at a position extending from the periphery (18) of the disposable sanitary article (1) via a wing joint line (J w ) are connected to the outer periphery (18) of the disposable sanitary article at the front wing joint and the rear wing joint; wherein the outer edge (38) of the at least one asymmetric wing includes a front wing distance point (D f ) and rear wing distance point (D r ), where the front wing is at a distance from point (D f ) in the outer lateral direction with the wing joint line (J w ) are separated by a lateral distance (J1) of 3 mm; The absorbent core further comprises a first front anastomosis line (101) and a second front anastomosis line (102), the first front anastomosis line (101) being arranged symmetrically with respect to the longitudinal axis or the transverse axis with respect to the second front anastomosis line (102), wherein the first front anastomosis line (101) extends along a first diagonal axis (CL1) extending in the plane of the disposable sanitary article (1) from an outer free end located on or adjacent to the left core edge line (8) toward a longitudinal center line (A) wherein the second front stapling line extends along a second diagonal axis (CL2) extending in the plane of the disposable sanitary article from an outer free end located on or adjacent to the left core edge line (8) or the right core edge line (9) towards an inner end located on or adjacent to the longitudinal center line, the first diagonal axis (CL1) and the second diagonal axis (CL2) converging at a convergence point (C); wherein the first anterior anastomotic line (101) and the second anterior anastomotic line (102) have a minimum transverse distance S therebetween at their closest approach, wherein the transverse distance S is greater than 0 mm; wherein the first anterior staple line (101) and the second anterior staple line (102) are provided by removing pulp from the first anterior staple line and the second anterior staple line to create a channel, The distance between the front wing and the point (D) of the at least one asymmetric wing measured along the longitudinal centerline is f ) and the first longitudinal distance (D) between the convergence point (C) C ) is between 5-30mm.

2. The disposable sanitary article according to claim 1, wherein: The front wing distance point (D) of the at least one asymmetric wing measured along the longitudinal centerline f ) and the first longitudinal distance (D) between the convergence point (C) C ) is between 10-25mm.

3. The disposable sanitary article according to claim 2, wherein: The front wing distance point (D) of the at least one asymmetric wing measured along the longitudinal centerline f ) and the first longitudinal distance (D) between the convergence point (C) C ) is between 13-20mm.

4. The disposable sanitary article according to any one of claims 1 to 3, wherein: The wing joint line (J w ) limits the wing length to be between 50-110 mm.

5. The disposable sanitary article according to claim 4, wherein: The wing joint line (J w ) The wing length is limited to between 75-100mm.

6. The disposable sanitary article according to claim 4, wherein: The wing joint line (J w ) The wing length is limited to between 85-95mm.

7. The disposable sanitary article according to any one of claims 1 to 3, wherein: The width (M) between the left core edge line (8) and the right core edge line (9) in the neck region (13) is between 30 and 60 mm.

8. The disposable sanitary article according to claim 7, wherein: The width (M) between the left core edge line (8) and the right core edge line (9) in the neck region (13) is between 32 and 42 mm.

9. The disposable sanitary article according to any one of claims 1 to 3, wherein: The front wing joint portion includes a left front wing joint portion (19) and a right front wing joint portion (20). When viewed from the transverse direction (x), the front wing joint width (W) between the left front wing joint portion (19) and the right front wing joint portion (20) is fwj ) is between 75-95mm.

10. The disposable sanitary article according to claim 9, wherein: From the horizontal direction (x), the front wing joint width (W) between the left front wing joint (19) and the right front wing joint (20) is fwj ) is between 80-90mm.

11. The disposable sanitary article according to claim 9, wherein: From the horizontal direction (x), the front wing joint width (W) between the left front wing joint (19) and the right front wing joint (20) is fwj ) is between 85-87mm.

12. The disposable sanitary article according to any one of claims 1 to 3, wherein: The rear wing joint portion comprises a left rear wing joint portion (21) and a right rear wing joint portion (22). When viewed from the transverse direction (x), the rear wing joint width (W) between the left rear wing joint portion (21) and the right rear wing joint portion (22) is rwj ) is between 85-95mm.

13. The disposable sanitary article according to claim 12, wherein: From the horizontal direction (x), the rear wing joint width (W) between the left rear wing joint (21) and the right rear wing joint (22) is rwj ) is between 87-93mm.

14. The disposable sanitary article according to claim 12, wherein: From the horizontal direction (x), the rear wing joint width (W) between the left rear wing joint (21) and the right rear wing joint (22) is rwj ) is between 88-91mm.

15. The disposable sanitary article according to any one of claims 1 to 3, wherein: The second front staple line (102) extends from an outer end located on or adjacent to the right outer edge toward an inner end located on or adjacent to the longitudinal center line.

16. The disposable sanitary article according to claim 15, wherein: The first front anastomosis line (101) and the second front anastomosis line (102) form at least a first front V-shape having two arms, the two arms extending from outer free ends located on or adjacent to the left core edge line (8) and the right core edge line (9) toward inner ends located on or adjacent to the longitudinal center line, the inner ends being closest to the path (V tip1 ) are separated by a distance S=0, and the closest path (V tip1 ) is located forward of the outer free end of the arm.

17. The disposable sanitary article according to any one of claims 1 to 3, wherein the absorbent core (6) further comprises a first rear staple line (201) and a second rear staple line (202).

18. The disposable sanitary article according to claim 17, wherein: The first rear anastomosis line (201) and the second rear anastomosis line (202) form a rear V-shape with two arms, and the two arms extend from the outer free ends located on or adjacent to the left core edge line (8) and the right core edge line (9) to the inner ends located on or adjacent to the longitudinal center line (A), separated by a distance S≥0 at the closest path, and wherein the closest path is located behind the outer free ends of the arms.

19. The disposable sanitary article according to claim 16, wherein: The absorbent core further comprises a third front seam line (103) and a fourth front seam line (104) forming a second front V-shape, which has two arms, the two arms extending from the outer free ends located on or adjacent to the left core edge line (8) and the right core edge line (9) toward the inner ends located on or adjacent to the longitudinal center line (A), and the arms are located closest to the path (V tip2 ) are separated by a distance S=0, and the closest path (V tip2 ) is located behind the outer free end of the arm.

20. The disposable sanitary article according to claim 19, wherein The closest path (V tip1 ) and the closest path of the inner end of the second front V-shape (V tip2 )coincide.

21. The disposable sanitary article according to claim 19, wherein The distance (D) between the tip of the first front V-shape and the tip of the second front V-shape v ) is between 0-10mm.

22. The disposable sanitary article according to claim 21, wherein The distance (D) between the tip of the first front V-shape and the tip of the second front V-shape v ) is between 2-6mm.

23. The disposable sanitary article according to claim 21, wherein The distance (D) between the tip of the first front V-shape and the tip of the second front V-shape v ) is between 3-5mm.

24. The disposable sanitary article according to claim 1, wherein The second front staple line (102) extends from an outer end located on or adjacent to the left outer edge toward an inner end located on or adjacent to the longitudinal center line.

25. The disposable sanitary article according to any one of claims 1 to 3, wherein: The first front seam line (101) and the second front seam line (102) are grooves or channels whose depth corresponds to 25% or more of the unloaded thickness of the absorbent core (6), or are low-density areas, wherein the low-density areas have a density corresponding to 50% or less of the density of the absorbent core (6), the unloaded thickness or density of the absorbent core (6) being measured in an area of the absorbent core (6) adjacent to the first front seam line (101) or the second front seam line (102).

26. Disposable sanitary article according to claim 25, wherein the depth of the grooves or channels corresponds to 25% - 100% of the unloaded thickness of the absorbent core (6).

27. The disposable sanitary article according to any one of claims 1 to 3, wherein: The absorbent core comprises a first region (12), the first region comprising a head region (14) and two legs (52, 53), the two legs extending symmetrically about the longitudinal center line (A) in the longitudinal direction (y) of the article (1), and wherein the absorbent core (6) further comprises a second region (50), the second region being at least partially surrounded by the first region (12), and wherein the average density of the second region (50) is at least 20% lower than the average density of the first region (12).

28. The disposable sanitary article (1) according to claim 27, wherein the average density of the second region (50) is at least 30% lower than the average density of the first region (12).

29. The disposable sanitary article (1) according to claim 27, wherein the average density of the second region (50) is at least 50% lower than the average density of the first region (12).

30. The disposable sanitary article (1) according to claim 27, wherein The two legs (52, 53) start from a common leg starting point (a0) in the crotch portion (3) and diverge, and extend over a portion of the crotch portion (3) toward separate leg ends (58, 59) in the back portion (4), and wherein the second region (50) extends between the legs (52, 53) in the transverse direction (x) and the longitudinal direction (y) from the leg starting point (a0) to an end point in the back portion (4), and thereby, the distance (a) in the transverse direction (x) between the opposite sides (54, 55) of the respective legs (52, 53) is x ) varies in the longitudinal direction (y), and the maximum distance (a1) between the opposite sides (54, 55) of the respective legs (52, 53) in the transverse direction (x) is located in the crotch portion (3) at a position corresponding to the position of the crotch point (80) in the longitudinal direction (y), and wherein the opposite sides (54, 55) of the respective legs (52, 53) converge rearwardly in the longitudinal direction (y) so that the distance (a1) x ) decreases from the maximum distance (a1) to the minimum distance (a2).

31. The disposable sanitary article according to any one of claims 1 to 3, wherein: The disposable sanitary article comprises a first asymmetric wing and a second asymmetric wing as viewed along any transverse axis of the disposable sanitary article, and wherein the first asymmetric wing and the second asymmetric wing are asymmetric relative to each other as viewed along the longitudinal centerline.

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