Pants-type absorbent article with wear stability

Abstract

The utility model discloses a pants-type absorption product with wearing stability. The pants-type absorption product comprises a front piece and a back piece, a back sheet; the rear piece and the front piece are generally symmetrically arranged along the transverse folding line; a crotch region; wherein further included is a plurality of stretch yarns located in the back sheet wherein the plurality of stretch yarns comprises a) 5 to 300 elastic strands, b) an average strand pitch of 1 mm to 300 mm, c) an average denier of 50 to 1000 deniers, and d) an average pre-strain of 150% or more, and wherein the plurality of stretch yarns comprise a) 5 to 300 elastic strands, b) an average strand pitch of 1 mm to 300 mm, c) an average denier of 50 to 1000 deniers, and d) an average pre-strain of 150% or more. The rear sheet has an elongation in the lengthwise direction of 1-3 times the elongation in the widthwise direction in a region in which the plurality of stretch yarns are arranged. As a result, satisfactory fit and stability can be provided, which allows for a significant improvement in wear stability and fit of existing pant-type absorbent articles.

Description

Technical Field

[0001] This utility model relates to the field of disposable hygiene products, and more particularly to a pant-type absorbent product that provides satisfactory fit and stability when worn on the user's buttocks. Background Technology

[0002] Women typically menstruate for about 5-7 days each month, during which menstrual blood is discharged from the body. From the early use of toilet paper to the present day, with economic development, sanitary napkins and tampons have emerged to absorb menstrual blood. Generally, women place sanitary napkins or tampons at the bottom of their underwear during their period to absorb the blood. However, sanitary napkins are generally for single use and must be discarded after use, inevitably creating excessive waste and burdening the environment in the long run.

[0003] As an alternative to sanitary napkins or tampons, panty-style absorbent products have been developed that allow women to wear during menstruation or their period. These are widely known as period panties. Period panties can also be called sanitary trousers. They are disposable hygiene products and are popular among women due to their convenience, comfort, and good absorbency.

[0004] With improvements in manufacturing processes, most current menstrual panties are designed as one-piece garments. The front and back panels of these panties are mostly made of non-woven or non-elastic materials with minimal elasticity. Aside from the leg bands (to prevent leakage of menstrual blood or other bodily fluids) that create a snug fit when the panties are closed (e.g., multiple elastic bands running from the back to the crotch area), the rest of the panties lack any features to alter the elasticity or stretch coefficient of the front and back panels. This results in insufficient overall coverage and fit when the panties are worn. Specifically, they tend to have gaps or bulges when worn statically, and the leg openings tend to slip upwards noticeably during movement. This gives consumers a negative impression and experience of poor product performance and quality.

[0005] In response, some have suggested replacing the inelastic fabrics of the front and back panels with fabrics possessing ideal elasticity to address the aforementioned shortcomings. However, such a proposal still has the following unsatisfactory aspects: 1. Replacing the fabrics of the front and back panels would obviously increase the material cost of the trouser-style absorbent fabric; 2. Replacing the fabrics of the front and back panels would require changes to the entire trouser-style absorbent fabric production line process to ensure that other components of the trouser-style absorbent fabric can be integrated with the new fabric, etc.

[0006] In summary, there is a pant-type absorbent article in the art that can provide satisfactory fit and stability when worn on a user's buttocks in a low-cost manner, which allows for a significant improvement in the wearing stability and fit of existing pant-type absorbent articles. Utility Model Content

[0007] Therefore, the objective of this invention is to provide a trouser-type absorbent article with wear stability, thereby at least partially overcoming the shortcomings of the prior art.

[0008] To accomplish the above tasks, this utility model provides a trouser-type absorbent article with wear stability, which can be folded and fitted into a closed form with a waist opening and leg openings by means of an open, one-piece trouser body. It includes: a front piece, which extends substantially along the longitudinal centerline of the trouser-type absorbent article and has a pair of front side edges arranged substantially symmetrically about the longitudinal centerline and a front waistband edge for forming the waist opening; and a rear piece, which extends substantially along the longitudinal centerline of the trouser-type absorbent article and has a pair of front side edges arranged substantially symmetrically about the longitudinal centerline and a front waistband edge for forming the waist opening; The pant consists of a pair of back panel side edges arranged generally symmetrically along the longitudinal center line, a back waistband edge forming a waist opening, and a pair of back leg edges longitudinally spaced inward from the back waistband edge. These back leg edges extend obliquely from the longitudinally inward ends of the back panel side edges to the crotch area to form the leg opening hem when closed. The back panels and the front panel are arranged generally symmetrically along a transverse fold line. The crotch area, located between the front and back panels, has an absorbent core for absorbing bodily fluids. It also includes multiple elastic threads located in the back piece, wherein the multiple elastic threads include a) 5 to 300 elastic strands, b) an average strand spacing of 1 mm to 50 mm, c) an average fineness of 20 to 1000 denier, and d) an average pre-strain of more than 120%; wherein the multiple elastic threads include: a first section and a second section extending obliquely on both sides of the back piece in the transverse direction, generally parallel to the leg edge of the back piece, wherein the two outermost edges of the first section and the second section are spaced apart from each other in the transverse direction by a first width in the range of 300 to 900 mm; and a third section extending longitudinally inward between the first section and the second section and arched towards the crotch area, wherein the third section smoothly transitions with the first section and the second section at its generally symmetrical ends, wherein the innermost edge of the third section is spaced apart from the back waist edge in the longitudinal direction by a first height in the range of 200 to 550 mm and the outermost edge is spaced apart from the back waist edge in the longitudinal direction by a second height in the range of 190 to 540 mm.

[0009] Therefore, compared with the prior art, the absorbent trousers according to this utility model can provide the wearer with satisfactory fit and dynamic stability in a simple and easy way, so that when the consumer wears them, they can tightly wrap around and fit the buttocks, and can also effectively avoid the pain point of the trousers slipping up during the consumer's movement, thereby significantly improving user satisfaction and consumption experience.

[0010] As a preferred aspect, the first height is designed to be in the range of 350 to 450 mm and the second height is designed to be in the range of 220 to 350 mm, and / or the first width is designed to be in the range of 500 to 700 mm.

[0011] As a preferred aspect, the elongation of the back piece in the longitudinal direction in the region where multiple elastic threads are arranged is 1 to 3 times the elongation in the transverse direction.

[0012] As a preferred aspect, the elongation recovery rate of the rear piece in the longitudinal direction is 1 to 2 times that in the transverse direction.

[0013] As a preferred aspect, a plurality of monitoring positions are symmetrically arranged along the hem of the back piece, wherein the slippage of the trouser-type absorbent product at the plurality of monitoring positions does not exceed 5 mm.

[0014] As a preferred aspect, the absorbent core includes an absorbent surface layer and a liquid-separating bottom layer, and is designed to be removably or replaceably fixed to the inside of the crotch area.

[0015] As a preferred aspect, the absorbent core is an absorbent structure sewn into the groin area, comprising a core layer closest to the body, an absorbent layer directly below the core layer, and an outermost barrier layer to prevent leakage of bodily fluids.

[0016] As a preferred aspect, the back piece includes an inner nonwoven fabric on the body-facing side and an outer nonwoven fabric on the clothing-facing side, wherein the elastic yarn is sandwiched between the inner and outer nonwoven fabrics, wherein the inner and outer nonwoven fabrics are designed as nonwoven materials that are substantially non-elastic or non-stretchable.

[0017] As a preferred aspect, the number of elastic fibers is 9 to 15, and the average strand spacing is designed to be 2 to 5 millimeters. Attached Figure Description

[0018] Figure 1 This is a flat view of an existing trouser-style absorbent fabric, with the trouser-style absorbent fabric in an open position;

[0019] Figure 2This is a front view of the main body of an existing trouser-style absorbent product that has been folded up, with the trouser-style absorbent product in a closed state;

[0020] Figure 3 This is a flat view of the trouser-shaped absorbent product provided by this utility model, wherein the trouser-shaped absorbent product is in an open state;

[0021] Figure 4 This is a front view of the folded trouser-type absorbent product provided by this utility model, wherein the trouser-type absorbent product is in a closed state;

[0022] Figure 5 This is a rear view of the trouser-shaped absorbent product provided by this utility model after it has been folded up, wherein the trouser-shaped absorbent product is in a closed state;

[0023] Figure 6 This is a partially enlarged view showing the seam of the absorbent trousers of this utility model when the wearer is standing upright;

[0024] Figure 7 This is a partially enlarged view showing the fit line of the trouser-type absorbent product of this utility model when the wearer lifts their leg;

[0025] Figure 8 This is a schematic view showing partial slippage of the bonding line in the absorbent trousers of this invention.

[0026] Explanation of reference numerals in the attached figures

[0027] 10, 100 - Pants-style absorbent fabric; 11, 101 - Front panel; 11A, 101A - Front waistband edge;

[0028] 12, 102 - Back panel; 12A, 102A - Back waistband edge; 12C, 102C - Waistband elastic;

[0029] 13, 103 - Crotch area; 14 - Leg braces;

[0030] 11B, 101B - Front edge; 12B, 102B - Rear edge;

[0031] 102D - Rear leg edge; L - Longitudinal center line;

[0032] T - Horizontal fold line; X - Horizontal; Y - Vertical; 104 - Elastic yarn;

[0033] 104A - Bottommost end; 104B - Topmost end; 1041, 1042 - First and second sections;

[0034] 1043 - Third section; 15, 105 - Waist opening; 16A, 106A - First leg opening;

[0035] 16B, 106B - Second leg opening; 17, 107 - Waistband; 18, 108 - Absorbent core;

[0036] 19, 109A, 109B - Hem; 109 - Absorbent core; 201 - Gluteal muscles;

[0037] 202 - Thigh; P1 to P6 - Monitoring positions; h1 - First altitude; h2 - Second altitude;

[0038] w1 - First width; Detailed Implementation

[0039] Those skilled in the art will understand that the following detailed description of embodiments is merely an illustration of exemplary models and is not intended to limit the broader aspects of this disclosure.

[0040] According to the present invention, a trouser-type absorbent article can be folded and joined to a closed form having a waist opening and leg openings by means of an open, one-piece trouser body. It comprises: a front piece extending generally along the longitudinal centerline of the trouser-type absorbent article and having a pair of front side edges arranged generally symmetrically about the longitudinal centerline and a front waist edge for forming the waist opening; and a rear piece extending generally along the longitudinal centerline of the trouser-type absorbent article and having a pair of rear side edges arranged generally symmetrically about the longitudinal centerline, a rear waist edge for forming the waist opening, and a pair of rear leg edges longitudinally spaced inward from the rear waist edge, wherein these rear leg edges extend longitudinally from the rear side edges. The inwardly extending end obliquely to the crotch area forms a leg opening at the hem when closed; the back piece and the front piece are arranged substantially symmetrically along a transverse fold line; the crotch area, located between the front and back pieces, has an absorbent core for absorbing bodily fluids; it also includes multiple elastic threads in the back piece, wherein the multiple elastic threads comprise a) 5 to 300 elastic strands, b) an average strand spacing of 1 mm to 50 mm, c) an average fineness of 50 to 1000 denier, and d) an average pre-strain of more than 150%; such that the elongation of the back piece in the region where the multiple elastic threads are arranged is 1 to 3 times the elongation in the transverse direction.

[0041] Certain directional terms used in the description of the accompanying drawings, such as “inner,” “outer,” “upper,” “lower,” and other directional terms, shall be understood to have their normal meaning and refer to those directions as understood when normally viewing the drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0042] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0043] Terminology Definition

[0044] The terms “disposable” or “reusable” are used herein to describe absorbent articles that are not typically intended to be washed or otherwise restored to or reused as absorbent articles (e.g., they are designed to be discarded after a single use and may also be configured to be recyclable, compostable, or disposed of in other environmentally compatible ways). The absorbent pants described herein are examples of disposable absorbent articles.

[0045] The term "pant-type absorbent product" (also known as "menstrual pants," "pant-type absorbent product 100," and "menstrual pants") refers herein to a disposable absorbent product or baby diaper designed for adult wearer, having a continuous perimeter waist opening and side-opposite continuous perimeter leg openings. For the avoidance of confusion, adult incontinence products can be in the form of absorbent pants. The pants may be constructed to have a continuous or closed waist opening, such as a package, and at least one continuous closed leg opening before the wearer puts on the product. The pants may be pre-formed using a variety of techniques, including but not limited to using any reusable fastening closure and / or permanent closure (e.g., stitching, thermal bonding, pressure welding, adhesives, glue bonding, mechanical fasteners, etc.) to join the parts of the product together. The pants may be pre-formed at any location around the waist area of ​​the product (e.g., side-fastening or seam-fastening, front waist-fastening or seam-fastening, back waist-fastening or seam-fastening, or combinations thereof).

[0046] Regarding structural terminology, the terms “set up” or “equipped” are used herein to indicate that one or more elements are located in a particular place or position as part of a macroscopic overall structure with other elements or as separate elements joined to another element.

[0047] As used herein, the term "joint" includes a configuration in which an element is directly secured to another element by directly attaching the element to the other element, and a configuration in which an element is indirectly secured to another element by attaching the element to an intermediate member (which in turn is attached to the other element).

[0048] As used herein, “integral” means a configuration in which an element is generated from or derived from a part of an article, as opposed to an element being joined to a part. “Integral formation” means generating an element from an underlying material or a portion thereof by, for example, molding, forming, and / or remodeling the underlying material.

[0049] "Proximal" and "distal" refer to the position of an element that is relatively close to or far from the longitudinal or lateral centerline of the structure, respectively (for example, relative to the same longitudinal axis, the proximal edge of a longitudinally extending element is closer to the longitudinal axis than the distal edge of the same element).

[0050] "Facing the body" and "facing the clothing" refer to the relative positions of components or the relative positions of the surfaces of a component or group of components, respectively. "Facing the body" means that during wear, a component or surface is closer to the wearer than some other components or surfaces. "Facing the clothing" means that during wear, a component or surface is further away from the wearer than some other components or surfaces (i.e., the component or surface is closer to the wearer's clothing, which may be worn over a disposable absorbent material).

[0051] The term "opening" refers to the initial separation of opposite waist areas before or during the wearing of an article, thus not forming a continuous waist and leg opening.

[0052] The term "closure" refers to the permanent or repeatable secure joining of opposing waist areas during encapsulation to form a continuous waist opening and leg opening.

[0053] As used herein, the term "bonding" refers to the joining, adhesion, connection, attachment, etc., of two elements. Two elements are considered to be bonded together when they are joined, adhered, connected, attached, etc., directly or indirectly to each other, such as when bonded to an intermediate element. Bonding can be performed via, for example, adhesives, pressure bonding, thermal bonding, ultrasonic bonding, splicing, stitching, and / or welding.

[0054] Pants-style absorbent products

[0055] Figure 1 The image shows a flat view of the main body of a conventional trouser-type absorbent article 10, with the trouser-type absorbent article 10 in an open position. (Refer to...) Figure 1 As is well known to those skilled in the art, Figure 1 The absorbent trousers 10 shown herein are formed by folding and joining a one-piece trouser body (e.g., made of a nonwoven fabric or other suitable nonwoven material that is essentially inelastic or stretchy) to a closed form with a waist opening and leg openings. The closed absorbent trousers 10 are as follows: Figure 2 As shown, the trouser-type absorbent article 10 generally includes a front piece 11, a back piece 12, and a crotch area 13 arranged between the front piece 11 and the back piece 12.

[0056] Here, as Figure 1As shown, the front piece 11 extends generally along the longitudinal centerline L of the trouser-type absorbent article 10 and has a pair of front piece side edges 11B (only the side edges on the right side of the figure are shown here) arranged generally symmetrically about the longitudinal centerline and a front waist edge 11A for forming a waist opening. Meanwhile, the rear piece 12 extends generally along the longitudinal centerline L of the trouser-type absorbent article 10 and has a pair of rear piece side edges 12B (only the side edges on the right side of the figure are shown here) arranged generally symmetrically about the longitudinal centerline and a rear waist edge 12A for forming a waist opening. The rear piece 12 and the front piece 11 are arranged generally symmetrically along the transverse fold line T.

[0057] Thus, the front piece 11 and the back piece 12 are arranged generally symmetrically along the fold line T and can be folded and interconnected along the transverse fold line T to form a waist area. The waist area has a waist opening 15, which is enclosed by the front waist edge 11A and the back waist edge 12A, for the wearer's waist to be accommodated, and two leg openings, which are enclosed by the front piece 11, the back piece 12, and the crotch area 13, for the wearer's thighs to pass through: a first leg opening 16A and a second leg opening 16B. The boundaries of the first leg opening 16A and the second leg opening 16B are defined by the trouser hem (or leg opening) 19 in the front piece 11 and the back piece 12. The crotch area 13 is located at the bottom of the waist area between the first leg opening 16A and the second leg opening 16B.

[0058] The absorbent core 18, with a known structure and absorbent composition, is removably or replaceably fixed to the inside of the crotch area 13 (the inside refers to the side facing the wearer's crotch). As an example, the absorbent core 18 comprises, from the inside out, an absorbent surface layer and a liquid-repellent bottom layer. The absorbent surface layer is made of nonwoven fabric, such as spunlace nonwoven fabric, spunbond nonwoven fabric, spunbond nonwoven fabric, or hot-air nonwoven fabric. Using nonwoven fabric provides moisture-proof, breathable, flexible, and lightweight effects at a low cost. Because nonwoven fabric has a certain absorbency, the menstrual underwear of this invention can be used alone when menstrual flow is light, offering lightweight breathability. Furthermore, the air permeability of the liquid-repellent bottom layer is not less than 10 cubic meters per square meter per minute to further improve the breathability of the menstrual underwear.

[0059] The method of fixing the absorbent core 18 to the crotch area 13 of the trouser-type absorbent article 10 can be selectively set according to the actual situation. For example, the absorbent core 18 is fixed to the inside of the crotch area 13 of the trouser-type absorbent article 10 by glue or Velcro.

[0060] Those skilled in the art will understand that, although the absorbent core 18 is designed herein as a removable component, independent of the pant-style absorbent article 10 (which allows the wearer to replace multiple absorbent cores 18 during a single use of the pant-style absorbent article), it is equally feasible for the absorbent core 18 to be, for example, an absorbent structure sewn into the crotch area 13, comprising, for example, a wicking layer (made of 100% polyester fiber) located closest to the body, an absorbent layer (made of 85% polyester fiber and 15% polyamide fiber) located directly below the wicking layer for absorbing menstrual blood during menstruation, and a barrier layer (made of 100% polyurethane fiber) located on the outermost side of the absorbent pant fabric to prevent leakage of bodily fluids. Period pants or absorbent underwear with such a non-removable absorbent core also fall within the scope of this invention.

[0061] Furthermore, the trouser-style absorbent article 10 may also have multiple leg-hoop elastic bands 14 extending laterally in the back piece 12 to form leg cuffs or leg opening barriers, wherein these leg-hoop elastic bands 14 may be designed to be sandwiched between the inner and outer nonwoven fabric layers of the back piece 12. Each leg-hoop elastic band 14 that can be used as a leg opening barrier may be a single strand of an elastomeric material, such as... Figure 1 The example illustrates three strands of elastic material. It should be understood that the number of strands in the leg brace 14 can be optional, depending primarily on the compression of the leg brace strands.

[0062] Meanwhile, multiple elastic waistbands 12C are sandwiched between the inner and outer nonwoven fabrics near the back waist edge 12A of the back piece 12, aligned parallel to each other and evenly spaced apart. As an example only, the spacing between the elastic waistbands 12C in the back piece 12 can be approximately 0.5 mm or more, preferably 0.5 to 5 mm. Here, these elastic waistbands 12C have been stretched to a certain stretch ratio when laminated between the inner and outer nonwoven fabrics of the back piece 12. Here, the stretch ratio of the multiple elastic strands 106B can be designed to be 150% or more, preferably 150% to 350%. Similarly, the elastic waistbands are also laminated between the inner and outer nonwoven fabrics near the front waist edge 11A of the front piece, thereby delivering acceptable tension under the strands to the wearer, providing good fit and comfort without causing sagging or leakage during wear of the trouser-type absorbent garment 10.

[0063] like Figure 1As shown, the front panel 11 has a pair of front panel side edges 11B arranged generally symmetrically about the longitudinal center line L. Each pair of front panel side edges 11B is located at one of the two transverse ends of the front panel 11, and extends a certain length along the longitudinal center line L of the pants body. Correspondingly, the rear panel 12 also has a pair of rear panel side edges 12B arranged generally symmetrically about the longitudinal center line L. Each pair of rear panel side edges 12B is located at one of the two transverse ends of the rear panel 12, and also extends a certain length along the longitudinal center line L of the pants body.

[0064] Therefore, when making such Figure 2 When the trouser-type absorbent product 10 shown has a waist opening 15 and two leg openings 16A and 16B, it can... Figure 1 The trouser body shown is folded along the transverse fold line T, allowing the front panel side edge 11B, extending a certain length along the longitudinal center line L of the trouser body, to overlap at least to some extent with the rear panel side edge 12B, which also extends a certain length along the longitudinal center line L of the trouser body. This allows a portion to be formed in the overlapping area of ​​the front panel side edge 11B and the rear panel side edge 12B, which can be laminated, heat-sealed, or ultrasonically bonded during a bonding process. This portion transforms the open trouser body into a closed trouser-type absorbent article 10. In this case, the portion formed by the interlocking of the front panel side edge 11B and the rear panel side edge 12B serves as the waistband 17 of the trouser-type absorbent article 10 (e.g., ...). Figure 2 (As shown).

[0065] Figure 1 and 2 The shortcomings of the absorbent trousers 10 shown are that the overall fit and closeness are not ideal when worn by the user (there will be some gaps or bulges when worn statically), and there will be obvious upward slippage of the leg openings during dynamic movements. The latter is because the wearer will inevitably undergo deformation during movement (for example, when moving from...). Figure 6 The upright position changed to Figure 7 (When the leg is raised, the shape of the gluteal muscles 201 will change significantly), which will cause the skin that comes into contact with or adheres to the pants-type absorbent product 10 to also deform.

[0066] Specifically, when the wearer is such as Figure 6 In the upright position shown, the gluteal muscles 201 are considered to be smoothly transitioned, generally symmetrical, spherical; in contrast, as... Figure 7As shown, when the wearer lifts their leg, the portion of the gluteal muscle 201 closer to the thigh 202 tends to move forward and become flatter. This movement indicates that the skin of the wearer's gluteal muscle 201 tends to contract inward toward the gluteal crease and extend forward along the gluteal muscle 201 toward the thigh 202 during the leg-lifting motion.

[0067] for Figure 1 and 2 As shown above, the trouser-type absorbent article 10 has two front panels 11 and 12 made of nonwoven fabric that is essentially inelastic or non-stretchable in both the longitudinal and transverse directions. The limited number of leg bands 14 arranged in the 12 are insufficient to prevent the trouser-type absorbent article 10 from following the deformation of the skin of the gluteal muscles 201 during the movement of the thigh 202. Specifically, the skin following the gluteal muscles 201 should not retract inward toward the gluteal cleft or extend forward toward the thigh 202. Consequently, the trouser-type absorbent article 10 inevitably slips away from the gluteal muscles 201 and overcomes the static friction between them, a phenomenon that can be described as insufficient or nonexistent wearing stability.

[0068] by Figure 8 As shown, multiple monitoring positions P1 to P6 are symmetrically arranged along the hem 109A or 109B of the wearer's pants. It can be observed that a relative slippage of 0.5 cm to 3 cm occurs at these monitoring positions P1 to P6. This often manifests as the hem 109A or 109B of the wearer slipping upward toward the crotch 13 or the wearer's buttocks, resulting in problems such as the wearer's buttock muscles 201 being exposed from the absorbent material 10 of the pants.

[0069] As a solution, in Figures 3 to 5 The image shows a pant-type absorbent article 100 with wear stability according to the present invention. Figure 1 and 2 Similar to the trouser-type absorbent articles shown, this trouser-type absorbent article 100 with wear stability is also formed by folding and joining a one-piece trouser body (e.g., made of a nonwoven fabric or other suitable nonwoven material that is essentially inelastic or stretchy) to a closed form with a waist opening and leg openings. The closed trouser-type absorbent article 100 is as follows: Figure 4 and 5As shown, the trouser-type absorbent article 100 generally includes a front panel 101, a back panel 102, and a crotch area 103 disposed between the front panel 101 and the back panel 102. Here, at least the back panel 102 includes an inner nonwoven fabric layer facing the body and an outer nonwoven fabric layer facing the clothing, wherein multiple elastic threads are sandwiched between the inner and outer nonwoven fabric layers, which are designed as nonwoven materials that are substantially non-elastic or non-stretchable. Similarly, the front panel 101 may also be designed to include an inner nonwoven fabric layer facing the body and an outer nonwoven fabric layer facing the clothing.

[0070] like Figure 3 As shown, the front piece 101 extends generally along the longitudinal centerline L of the trouser-type absorbent article 100 and has a pair of front side edges 101B (only the side edges on the right side of the figure are shown here) arranged generally symmetrically about the longitudinal centerline L and a front waist edge 101A for forming a waist opening. Meanwhile, the rear piece 102 extends generally along the longitudinal centerline L of the trouser-type absorbent article 100 and has a pair of rear side edges 102B (only the side edges on the right side of the figure are shown here) arranged generally symmetrically about the longitudinal centerline and a rear waist edge 102A for forming a waist opening. The rear piece 102 and the front piece 101 are arranged generally symmetrically along the transverse fold line T.

[0071] Thus, the front piece 101 and the back piece 102 are arranged generally symmetrically along the fold line T and can be folded and interconnected along the transverse fold line T to form a waist area. The waist area has a waist opening 105, which is enclosed by the front waist edge 101A and the back waist edge 102A, for the wearer's waist to be accommodated, and two leg openings, which are enclosed by the front piece 101, the back piece 102, and the crotch area 103, for the wearer's thighs to pass through: a first leg opening 106A and a second leg opening 106B. The boundaries of the first leg opening 106A and the second leg opening 106B are defined by the trouser hem (or leg opening) 109 in the front piece 101 and the back piece 102. The crotch area 103 is located at the bottom of the waist area between the first leg opening 106A and the second leg opening 106B. Furthermore, the absorbent core 108, with a known structure and absorbent composition, is removably or replaceably fixed to the inside of the crotch area 103 (the inside refers to the side facing the wearer's crotch).

[0072] Meanwhile, multiple elastic waistbands 102C are sandwiched between the inner and outer nonwoven fabrics near the back waist edge 102A in the back piece 102, aligned parallel to each other and evenly spaced apart. As an example only, the spacing between the elastic waistbands 102C in the back piece 102 can be approximately 0.5 mm or more, preferably 0.5 to 2.5 mm, and the number of elastic waistbands is approximately 20-100. Here, these elastic waistbands 102C have been stretched to a certain stretch ratio when laminated between the inner and outer nonwoven fabrics in the back piece 102. Here, the stretch ratio of the multiple elastic strands 102C can be designed to be 150% or more, preferably 150% to 350%. Furthermore, the rear piece 102 also has a pair of rear piece side edges 102B arranged generally symmetrically about the longitudinal center line L. The pair of rear piece side edges 102B are distributed at the two transverse ends of the rear piece 102, and the rear piece side edges 102B also extend a certain length along the longitudinal center line L of the trouser body.

[0073] like Figure 3 As shown, the back panel 102 further defines a pair of back panel leg edges 102D that are longitudinally inwardly spaced from the back waist edge 102A, and each of the pair of back panel leg edges 102D extends obliquely from the longitudinally inwardly end of the back panel side edge 102B to the crotch area 103. In this trouser-type absorbent article 100, [the following text appears to be incomplete and requires further context: "made of..."] Figure 3 The shown open state is changed to Figure 4 In the closed state shown, these back leg edges 102D subsequently form portions of the hem 109 (or leg opening) of the first leg opening 106A and the second leg opening 106B located in the back piece 102. As used herein to describe trouser-type absorbent articles, the term "longitudinal inward" means in the longitudinal direction toward the transverse fold line T, and the term "longitudinal outward" means in the longitudinal direction away from the transverse fold line T.

[0074] Different from Figure 1 and 2 The shown trouser-type absorbent product 10, such as Figure 3As most clearly shown, five to three hundred elastic filaments 104 arranged in an arc shape are sandwiched between the inner and outer nonwoven fabric layers of the back sheet 102. For example, there are nine to fifteen elastic filaments 104, more specifically ten. The fineness of these elastic filaments 104 is 20 to 1000 denier. The spacing between the arc-shaped elastic filaments 104 shown here can be approximately 1 mm to 50 mm, preferably 10 to 20 mm. These elastic filaments 104 have been stretched to a certain stretch ratio when laminated between the inner and outer nonwoven fabric layers of the back sheet 102. The stretch ratio of the multiple elastic filaments 104 can be designed to be 120% or more, preferably 150% to 350%. Here, the elastic yarns 104 arranged in an arc shape can be sandwiched between the inner and outer nonwoven fabrics of the back sheet 102 in an online or offline manner. That is to say, the way the elastic yarns 104 are laid is freely selectable by those skilled in the art.

[0075] More specifically, these elastic threads 104 are arranged in the back piece 102 in such a way that they include a first segment 1041 and a second segment 1042 extending obliquely on both sides of the back piece 102 in the lateral direction, generally parallel to the leg edge 102D of the back piece, wherein the first segment 1041 and the second segment 1042 are generally symmetrical about the longitudinal center line L. Between the first segment 1041 and the second segment 1042, there is a third segment 1043 that extends longitudinally inward and arches towards the crotch area 103 with a certain radius of curvature, wherein the third segment 1043 smoothly transitions with the first segment 1041 and the second segment 1042 at its two ends that are generally symmetrical about the longitudinal center line L.

[0076] More in detail, such as Figure 3In the open state shown, when viewed from the front, the innermost edge of the third segment 1043 of these elastic wires 104 along the longitudinal direction (Y direction) is spaced from the rear waist edge 102A at a first height h1 ranging from 200 to 550 mm, preferably between 350 and 450 mm. Simultaneously, the outermost edge of the third segment 1043 of these elastic wires 104 along the longitudinal direction (Y direction) is spaced from the rear waist edge 102A at a second height h2 ranging from 190 to 540 mm, preferably between 220 and 350 mm. Furthermore, the two opposite outermost edges of the first segment 1041 and the second segment 1042 of these elastic wires 104 along the transverse direction (X direction) are spaced from each other at a first width w1 ranging from 300 to 900 mm, preferably between 500 and 700 mm. Based on the first and second heights h1, h2 and the first width w1 given above, these elastic threads 104 depict a gentle concave curve in the area of ​​the front panel 101 of the trouser-type absorbent article 100 that overlaps with the multiple elastic strands 102C. Figure 1 Compared to the prior art shown in the figure, Figure 3 The coverage area of ​​the elastic wire 104 is significantly larger and the curvature of the third segment 1043 is significantly more pronounced.

[0077] Therefore, attributable to the aforementioned innovative design, in Figure 3 The absorbent garment 100 shown in the image is made of... Figure 3 The shown open state is changed to Figure 4 In the closed state shown, the elastic threads 104, arranged as described above and consisting of the first segment 1041, the third segment 1043, and the second segment 1042, generally conform to the outer contour of the wearer's gluteal muscles 201. In other words, when the wearer is wearing the closed trouser-type absorbent garment 100, the elastic threads 104 in the back panel 102 are generally tangent to the outer contour of the gluteal muscles 201 they contact, meaning the extension direction of the elastic threads 104 and the normal direction of the contacted gluteal muscles 201 are generally perpendicular. This allows the elastic threads 104 in the back panel 102 to closely conform to most of the contacted gluteal muscles 201, preventing discomfort such as... Figure 1-2 Hollows or bulges may occur in the absorbent fabric 10 of the pants.

[0078] It should also be noted that, although in the preferred embodiment described above, the elastic properties of the back sheet 102 are altered in a predetermined area by arranging multiple pre-stretched elastic filaments 104 offline or online, an equivalent alternative to the aforementioned elastic filaments 104 is an elastic film laminated between the nonwoven layers of the back sheet 102, possessing comparable elastic properties. Furthermore, as part of implementing the concept of this invention, it is also feasible to achieve the aforementioned technical effects using a nonwoven fabric with significant elasticity. All of the above variations are covered within the protection scope of this invention.

[0079] It should be noted that, based on the wearer's BMI, waist-to-hip ratio, and hip projection ratio, the shape of the buttocks varies among different wearers. For example, they can be classified as flat-pituitary, flat-medium, flat-upturned, moderate, and thick-medium. Therefore, those skilled in the art can adaptably arrange the elastic wires 104 according to the wearer's body size and experience data, so that the elastic wires 104 can generally fit the outer contour of the wearer's buttock muscles 201 (the elastic wires 104 in the back piece 102 are generally tangent to the outer contour of the buttock muscles 201 in contact with them at most points). These different arrangements of elastic wires 104 adapted to different body types are all covered within the protection scope of this utility model.

[0080] Of particular importance is that by adding the elastic yarn 104 as described above, the dynamic stability of the absorbent garment 100 when worn can be significantly improved. Specifically, with Figure 1-2 Compared to the absorbent trousers 10 without elastic yarn shown in the image, Figure 3 The absorbent trousers 100 shown in the figure have elastic yarns 104 arranged in the longitudinal direction in the back piece 102. Figure 4 The stretchability in the Y direction is greater than or equal to that in the lateral direction ( Figure 4 The elasticity (in the X direction) of the back piece 102. More specifically, in the region of the back piece 102 where the elastic wires 104 are arranged, the elongation rate along the longitudinal direction is 1 to 3 times the elongation rate in the transverse direction, most preferably 2 times. Furthermore, the elongation recovery rate of the back piece 102 in the region where the elastic wires 104 are arranged along the longitudinal direction is 1 to 2 times the elongation recovery rate in the transverse direction, preferably 1.5 times. This directional elasticity is mainly achieved by adjusting the stretch ratio and strand fineness of the elastic wires 104 arranged in the back piece 102, for example, by designing the stretch ratio of 10 elastic wires 104 to be 150% to 350%, and the strand fineness to be 400 denier. The inventors of this invention have found that by setting it within this range, the following of the back piece 102 relative to the movement of the gluteal muscles 201 can be sufficiently ensured, and the movement of the back piece 102 relative to the gluteal muscles 201 can be significantly prevented. Figure 4 The pant edges 109A and 109B shown are shown sliding upward relative to the gluteal muscles 201.

[0081] To better illustrate the technical effects of this utility model, Figure 6 and 7 The diagram schematically illustrates the change in elastic thread 104 extending along the gluteal cleft between the wearer's greater trochanter and groin as the skin of the gluteal muscles 201 moves. Here, the lowermost end 104A of the portion of the elastic thread 104 that forms the hem 109A and 109B is generally located near the gluteal cleft, and the uppermost end 104B is located near the wearer's greater trochanter. Figure 6 As shown, when the wearer remains upright and stationary, the elastic wire 104 adheres tightly to the gluteal muscles 201 that connect the greater trochanter of the wearer's body to the gluteal cleft. Figure 7 The middle section shows the change of the elastic wire 104 when the wearer changes from a static wearing state to a dynamic wearing state (e.g., raising the thigh).

[0082] like Figure 6 As shown, when the wearer remains upright, the elastic thread 104 in the absorbent trousers 100 according to this invention is shown to be tightly fitted between the greater trochanter (near the uppermost end 104B) and the crotch (near the lowermost end 104A) along the outer contour of the gluteal muscle 201. Specifically, the elastic thread 104 in the back piece 102 is substantially tangent to the outer contour of the gluteal muscle 201 it contacts at most points, meaning the extending direction of the elastic thread 104 and the normal direction of the contacting part of the gluteal muscle 201 are substantially perpendicular. Due to the tight fit between the two, there is virtually no... Figure 1-2 Hollows or bulges may occur in the absorbent fabric 10 of the pants.

[0083] Furthermore, such as Figure 7 As shown, even when the wearer performs large-scale movements (such as climbing mountains or stairs) and raises their thigh 202 (at which time the gluteal muscles 201 deform as the position of the connected greater trochanter and groin changes), although the gluteal muscles 201 undergo significant changes in their outer contour with the thigh 202 (in this case, becoming flat, the gluteal muscles 201 shrinking inward toward the gluteal cleft and extending forward toward the thigh 202), the elastic thread 104 remains in close contact with the gluteal muscles 201, which undergo significant shape changes, and does not slip significantly upward.

[0084] Measurement of relative slip

[0085] Figure 8This is a schematic diagram illustrating the anti-upward slippage effect of various parts of the trouser-type absorbent article 100 according to this utility model. Figure 8 In this study, with a wearer, model, or simulated robot wearing the trouser-type absorbent article 100 of this invention, the wearer, model, or simulated robot is moved, and the amount of upward sliding of the trouser edges 109A and 109B in the back piece 102 is observed. For this purpose, it is possible to... Figure 8 As shown, after the wearer, model, or simulated robot wears the pants-type absorbent product 100, multiple monitoring positions P1 to P6 with markers (e.g., dyes or colored substances) that can leave movement traces are sequentially arranged along the pant edges 109A and 109B of the back piece 102 and along the skin of the wearer's buttock muscles 201. In this state, the wearer or model is made to raise their thighs 202 at least 15 times.

[0086] After the wearer or model completes the action of raising their thigh 202, slippage marks left by, for example, dyes or colored substances are observed at monitoring positions P1 to P6 on the skin of the gluteal muscles 201 of the wearer or model after each movement. The distance between the slippage marks at these monitoring positions P1 to P6 and the initial hem 109A and 109B when standing upright is measured, and this distance is considered as the actual local slippage amount of the trouser-type absorbent article 100. According to the inventor's actual measurements, the local slippage amount at multiple monitoring positions such as P1 to P6 of the trouser-type absorbent article 100 of this invention can be controlled within the range of 0 to 5 mm. Therefore, compared with... Figure 1 and 2 The existing trouser-type absorbent article 10 shown (with a relative slippage amount ranging from 0.5 cm to 3 cm) confirms that the trouser-type absorbent article 100 of this invention can significantly control the upward slippage of the trouser edges 109A and 109B.

[0087] Determination of elongation and elongation recovery

[0088] In this invention, the elongation and elongation recovery rate can be determined, for example, using a constant-speed elongation tensile testing machine. Such a tensile testing machine can be, for example, a benchtop testing machine with the trade name zwickiLine, purchased from Zwick Testing Technology (Shanghai) Co., Ltd. For this test, four generally fan-shaped back sheets 102 with elastic wire 104, used as test pieces, are prepared in both the longitudinal and transverse directions. Two pieces are used for elongation testing, and the other two are used for elongation recovery testing.

[0089] In the elongation test, the back sheet 102 with elastic wire 104, used as the test piece, is clamped 25 mm at the top and 35 mm at the bottom, with a clamping interval of 100 mm, and is placed on the testing machine. A maximum load of 2.25 kgf (22.1 N) is applied at a speed of 300 mm ± 20 mm / min. Then, the elongation (%) is measured under loads of 1.00 kgf (9.8 N), 1.50 kgf (14.7 N), and 2.25 kgf (22.1 N). The integer part of the average value of the two samples is used as the elongation.

[0090] In the elongation recovery rate test, the back sheet 102 with elastic yarn 104, used as the test piece, is placed on the testing machine in the same manner as the elongation rate test. Next, the elongation is set using predetermined elongation setting conditions, and the elongation and recovery are repeated three times at a speed of 300 mm ± 20 mm / min. A load-elongation rate curve is calculated with the longitudinal axis as the load and the transverse axis as the elongation rate. Based on this curve, the elongation force and tension force are measured from the results of the first and third tests, and the integer part of the average value is calculated. Note that the elongation force here is the load during the upward movement, and the tension force is the load during the downward movement.

[0091] The elongation recovery rate was calculated based on the first load-elongation curve. With a set elongation of L and a residual elongation (the elongation relative to the original length after recovery) of L0, the formula becomes ((L - L0) / L) × 100 (%). Finally, the integer part of the average value of the two samples was used as the elongation recovery rate.

[0092] As can be seen from the above, the trouser-type absorbent product 100 of this utility model provides the wearer with satisfactory fit and dynamic stability in a simple and easy manner. This allows the trouser-type absorbent product 100 to tightly wrap and fit the buttocks when worn by the consumer, and can also effectively avoid the pain point of the trouser edge slipping upward during the consumer's movement. Furthermore, it can also avoid the adverse event of the trouser edge pinching the buttocks in people with a large waist-to-hip angle or a small waist-to-hip ratio, thereby significantly improving user satisfaction and consumption experience.

[0093] The embodiments of this utility model have been illustrated and described herein, but those skilled in the art should understand that various modifications, omissions, and additions can be made without departing from the spirit and scope of this utility model. It should not be understood as limited to the specific embodiments described herein, but encompasses all possible embodiments embodied within the scope and equivalents of the features described in the appended claims.

[0094] The dimensions and values ​​disclosed herein should not be construed as strictly limited to the precise numerical values ​​stated. Rather, unless otherwise specified, each such dimension is intended to represent the value and a functionally equivalent range around that value. For example, a dimension disclosed as “40 mm” is intended to represent “approximately 40 mm”.

[0095] All documents referenced in the “Detailed Description” section are incorporated herein by reference in the relevant sections; no reference to any document should be construed as an admission that it is prior art concerning this utility model. In the event of any conflict between the meaning or definition of any term in this written document and the meaning or definition of any term in the referenced documents, the meaning or definition assigned to the term in this written document shall prevail.

[0096] While specific embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that many other changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, the appended claims are intended to cover all such changes and modifications within the scope of the present invention.

[0097] When describing elements of the present invention or their preferred embodiments(s), the articles "a," "an," "the," and "the" are intended to indicate the presence of at least one element. The terms "comprising," "including," and "having" are intended to be inclusive and mean that additional elements may be present in addition to the listed elements. Many modifications and variations may be made to the present invention without departing from the spirit and scope thereof. Therefore, the above embodiments are not intended to limit the scope of the present invention.

Claims

1. A pant-type absorbent article having donning stability, which is capable of being turned inside out and joined to a closed form having a waist opening and leg openings by means of an integral pant main body, characterized by, Comprising: a front panel extending generally along a longitudinal centerline of the pant-type absorbent article and having a pair of front panel side edges arranged generally symmetrically about the longitudinal centerline and a front waist edge for forming a waist opening; a back panel extending generally along the longitudinal centerline of the pant-type absorbent article and having a pair of back panel side edges arranged generally symmetrically about the longitudinal centerline, a back waist edge for forming a waist opening, and a pair of back panel leg edges spaced longitudinally inward from the back waist edge, wherein the back panel leg edges extend obliquely from longitudinally inward ends of the back panel side edges to the crotch region to form leg openings of the pant in the closed configuration; the back panel is arranged generally symmetrically with the front panel along a transverse fold line; a crotch region between the front panel and the back panel and having an absorbent core for absorbing body fluids disposed thereon; wherein the plurality of elastic filaments comprises: a) a strand count of 5 to 300, b) an average strand spacing of 1 to 50 mm, c) an average denier of 20 to 1000 denier, and d) an average pre-strain of 120% or more; wherein the plurality of elastic filaments comprises: first and second sections extending obliquely generally parallel to the back panel leg edges on both sides of the back panel along the transverse direction, wherein opposite two outermost edges of the first and second sections along the transverse direction are spaced apart from each other by a first width in a range of 300 to 900 mm; and a third section arcuately convex toward the crotch region longitudinally inwardly between the first and second sections, wherein the third section smoothly transitions with the first and second sections at both generally symmetric ends thereof, wherein an innermost edge of the third section is spaced apart from the back waist edge in the longitudinal direction by a first height in a range of 200 to 550 mm and an outermost edge of the third section is spaced apart from the back waist edge in the longitudinal direction by a second height in a range of 190 to 540 mm.

2. The pant-type absorbent article having wearing stability according to Claim 1, wherein wherein the the first height is designed in a range of 350 to 450 mm and the second height is designed in a range of 220 to 350 mm, and / or the first width is designed in a range of 500 to 700 mm.

3. The pant-type absorbent article having wearing stability according to Claim 1, wherein wherein the back panel has an elongation in the longitudinal direction that is 1 to 3 times an elongation in the transverse direction in a region where the plurality of elastic filaments is arranged.

4. The pant-like absorbent article having wearing stability according to Claim 1, wherein the back panel has an elongation recovery in the longitudinal direction that is 1 to 2 times an elongation recovery in the transverse direction.

5. The pant-like absorbent article having wearing stability according to Claim 1, wherein wherein a plurality of monitoring positions are symmetrically arranged in sequence along the leg edges of the back panel, wherein a slippage of the pant-type absorbent article at the plurality of monitoring positions is no more than 5 mm.

6. The pant-like absorbent article having wearing stability according to Claim 1, wherein wherein the absorbent core comprises an absorbent top layer and a liquid-impermeable back layer and is designed to be detachably or replaceably fixed to an inner side of the crotch region.

7. The pant-type absorbent article having wearing stability according to Claim 1, wherein wherein the the absorbent core is a sewn absorbent structure in the crotch region, which comprises a wicking layer closest to the body side, an absorbent layer directly below the wicking layer, and an outermost barrier layer for preventing exudation of body fluids.

8. The pant-like absorbent article having wearing stability according to Claim 1, wherein The back panel comprises an inner layer of nonwoven fabric on the body-facing side and an outer layer of nonwoven fabric on the garment-facing side, wherein the elastic filaments are sandwiched between the inner and outer layers of nonwoven fabric, wherein the inner and outer layers of nonwoven fabric are designed as substantially inelastic or extensible nonwoven materials.

9. The pant-like absorbent article having donning stability according to Claim 1, characterized in that, wherein the number of elastic filaments is from 9 to 15, and the average filament spacing is designed to be from 2 to 5 mm.

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