A disposable undergarment

Abstract

This utility model discloses a disposable underwear comprising at least a main body. When unfolded, the main body has a front waist portion positioned along the wearer's abdomen, a back portion positioned along the wearer's back, and a crotch portion positioned between the front waist portion and the back. At least two sides of the crotch portion are provided with arc-shaped leg circumference lines. Along the longitudinal direction, the main body has a first center line extending laterally. Along the transverse direction, the main body has a second center line extending longitudinally. The leg circumference lines include a concave arc segment extending longitudinally towards the front waist. The concave arc segment intersects with the longitudinal edges on both sides of the front waist portion to form a first point, and the point on the concave arc segment furthest from the first center line is a second point. The difference between the vertical distance of the second point and the first center line and the vertical distance of the first point and the first center line is 5mm to 30mm. This utility model ensures that the elasticity of the front waist portion is not affected and that the leg circumference area does not constrict the thighs, providing comfort for the wearer at the groin.

Description

Technical Field

[0001] This utility model relates to the field of disposable hygiene products technology, and in particular to disposable underwear products made of nonwoven fabric as the main material, specifically a type of disposable underwear. Background Technology

[0002] Underwear is a common type of intimate clothing, typically characterized by its softness, comfort, and breathability. However, because it requires frequent washing and changing, it can be very inconvenient for frequent travelers. Disposable underwear products perfectly meet these needs during special times, offering cleanliness, hygiene, and portability, while eliminating the hassle of daily washing and drying.

[0003] Disposable underwear typically consists of a main body with a front waistband, crotch, and back. The main body has a pair of side closures formed by the two sides of the front waistband and the two sides of the back, giving the disposable underwear a shape with one waist opening and two leg openings. Along the edges of the two leg openings of the disposable underwear, there is an arc-shaped leg circumference line that conforms to the contour of the human thigh.

[0004] Chinese utility model patent CN211747005U discloses a pair of underwear, which includes: an underwear body, an elastic layer, and a plurality of first elastic threads; the underwear body includes a front fabric layer and a back fabric layer, and a crotch fabric layer connected between the front fabric layer and the back fabric layer; the crotch fabric layer includes a first side and a second side arranged opposite to each other; the first side forms a first leg opening, and the second side forms a second leg opening; the elastic layer includes a plurality of fabric layers; the elastic layer is connected to the top edge of the front fabric layer and the top edge of the back fabric layer, and the elastic layer has a waistband; the plurality of first elastic threads are composited on the underwear body. In this technical solution, the first and second sides are the aforementioned leg circumference lines. The leg circumference lines extend from the front and back waists towards the crotch, narrowing as they approach the crotch. The leg circumference lines are also relatively smooth. Although this type of leg circumference line creates a good fit for the legs, the underwear may feel tight around the groin area near the leg circumference lines when worn for extended periods, during vigorous leg movements, or when sitting for long periods, resulting in a poor wearing experience. Utility Model Content

[0005] This invention provides a disposable pair of underwear to solve the technical problem that existing disposable underwear tightly constricts the upper thighs near the leg opening, resulting in a poor wearing experience.

[0006] The technical solution provided by this utility model is as follows:

[0007] One objective of this utility model is to provide disposable underwear, which has orthogonal longitudinal, transverse and thickness directions when unfolded; the disposable underwear includes at least a body; along the thickness direction, the body includes at least an outer layer and an inner layer; when unfolded, the body has a front waist part disposed on the abdominal side of the wearer, a back part disposed on the back side of the wearer, and a crotch part disposed between the front waist part and the back part.

[0008] Along the horizontal direction, at least on both sides of the crotch area, there are arc-shaped leg circumference lines. The front waist and the back sides are formed with side seals by ultrasonic waves or heat pressing, so that the disposable underwear is formed into underwear shape with one waist opening and two leg openings.

[0009] Along the longitudinal direction, the center of the body has a first center line extending laterally; along the lateral direction, the center of the body has a second center line extending longitudinally.

[0010] The leg circumference line includes a concave arc segment that is recessed longitudinally toward the front waist; in the unfolded state, the concave arc segment intersects with the longitudinal edges on both sides of the front waist to form a first point, and the point on the concave arc segment that is farthest from the first center line is a second point, which is located in the front waist.

[0011] Along the longitudinal direction, the difference between the vertical distance of the second point and the vertical distance of the first point and the first center line is 5mm to 30mm.

[0012] Furthermore, in the transverse direction, the vertical distance between the second point and the longitudinal edge of the front waist is less than the vertical distance between the second point and the second center line.

[0013] In a preferred embodiment, along the transverse direction, the point on both sides of the body where the leg circumference line is closest to the second center line is the third point;

[0014] Along the transverse direction, the vertical distance between the second point and the longitudinal edges on both sides of the front waist is equal to 1 / 3 to 1 / 2 of the vertical distance between the third point and the longitudinal edges on both sides of the front waist.

[0015] In a preferred embodiment, in the crotch area, in the region near the back, the leg circumference has a prominent arc segment.

[0016] In a preferred embodiment, the disposable underwear further includes an inner lining sheet;

[0017] Along the thickness direction, in a portion of the crotch area, the inner lining is disposed on one side of the body skin.

[0018] In a preferred embodiment, in a portion of the crotch area, the inner lining sheet is secured to the inner surface of the inner layer sheet by an adhesive portion, thereby positioning the inner lining sheet on the skin side of the body.

[0019] In a preferred embodiment, along the longitudinal direction, both sides of the inner liner sheet are joined to the inner layer sheet by a plurality of first joints;

[0020] Along the transverse direction, the two sides of the inner lining sheet are joined to the inner layer sheet by a plurality of first joints, which are arranged along the contour of the leg circumference of the crotch area.

[0021] In a preferred embodiment, a plurality of first elastic threads are disposed between the inner layer and the outer layer; the first elastic threads extend laterally, and a plurality of the first elastic threads are arranged longitudinally at intervals in the front waist, crotch and back.

[0022] The first elastic thread is fixed between the inner layer and the outer layer by a first elastic thread adhesive; the first elastic thread has an average denier of 50 dtex to 600 dtex; along the longitudinal direction, the spacing between two adjacent first elastic threads is 2 mm to 8 mm.

[0023] In a preferred embodiment, at least in the front waist and back, the inner sheet and the outer sheet are joined together by an array of multiple second joints.

[0024] Along the longitudinal direction, there is at least one row of second joints between two adjacent first elastic lines; when the first elastic lines contract laterally, at least in the front waist and back, the inner sheet and the outer sheet form regular folds between a plurality of second joints.

[0025] In a preferred embodiment, the inner layer is made of a stretchable nonwoven fabric that is elastic in the transverse direction; the outer layer is made of a non-stretchable nonwoven fabric.

[0026] The inner layer and the outer layer are joined together by an array of third joints; the third joints are spaced apart along the transverse direction.

[0027] When the inner sheet contracts laterally, the outer sheet forms regular folds between the plurality of third joints.

[0028] In a preferred embodiment, along the longitudinal direction, the outer sheet is folded inwards on one side toward the skin to form a folded portion;

[0029] Multiple second elastic lines are disposed between the bent portion and the inner layer sheet, and the second elastic lines extend laterally.

[0030] The second elastic thread is fixed between the bent portion and the inner sheet by a second elastic thread adhesive; the second elastic thread has an average dtex of 310 dtex to 940 dtex; along the longitudinal direction, the spacing between two adjacent second elastic threads is 3 mm to 12 mm.

[0031] The above-described technical solution of this utility model has at least the following beneficial effects compared with the prior art:

[0032] This utility model provides a disposable underwear with a leg circumference line including a concave arc segment that is recessed towards the waist along the longitudinal direction. The concave arc segment intersects with the longitudinal edges on both sides of the front waist to form a first point, and the point on the concave arc segment that is farthest from the first center line is a second point. Along the longitudinal direction, the difference between the vertical distance between the second point and the first center line and the vertical distance between the first point and the first center line is 5mm to 30mm. This ensures that the elasticity of the front waist is not affected when the wearer wears the disposable underwear for a long time or does some leg movements with a large range of motion, and that the leg circumference line area does not become tight around the groin.

[0033] This utility model provides disposable underwear. The leg circumference includes a concave arc segment that curves longitudinally towards the waist. The concave arc segment intersects with the longitudinal edges on both sides of the front waist to form a first point, and the point on the concave arc segment furthest from the first center line forms a second point. Laterally, the point on both sides of the leg circumference that is closest to the second center line is a third point. Laterally, the vertical distance between the second point and the longitudinal edge of the front waist is less than the vertical distance between the second point and the second center line, and the vertical distance between the second point and the longitudinal edges on both sides of the front waist is equal to 1 / 3 to 1 / 2 of the vertical distance between the third point and the longitudinal edges on both sides of the front waist. This makes the elasticity gradually increase laterally from the second point to the longitudinal edges on both sides of the front waist, and gradually increase laterally from the second point to the third point, so that the elasticity is weakest at the position of the second point. Therefore, the disposable underwear will not feel tight around the thighs when the wearer sits for a long time (such as office workers sitting for long periods of time). Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the disposable underwear in the unfolded state in Embodiment 1 of this utility model.

[0036] Figure 2 yes Figure 1 Cross-sectional view in the SS direction.

[0037] Figure 3 This is a schematic diagram of a disposable underwear in Embodiment 1, in which the side seals of the front waist and back are joined together to form a waist opening and two leg openings.

[0038] Figure 4 This is a partial schematic diagram of the front waist and crotch of the disposable underwear in the unfolded state in Embodiment 1 of this utility model.

[0039] Figure 5 This is a schematic diagram of a cutting process for disposable underwear in Embodiment 1 of this utility model.

[0040] Figure 6 This is a schematic diagram of another cutting process for disposable underwear in Embodiment 1 of this utility model.

[0041] Figure 7 This is a schematic diagram of the disposable underwear in the unfolded state in Embodiment 2 of this utility model.

[0042] Figure 8 yes Figure 7 Cross-sectional view along the T1-T1 direction.

[0043] Figure 9 yes Figure 7 A magnified view of region I in the middle.

[0044] Figure 10 This is a schematic diagram of a second embodiment of the present invention, in which the inner and outer layers form regular folds between the second joint in the front waist and back.

[0045] Figure 11 This is a schematic diagram of the disposable underwear in the unfolded state in Embodiment 3 of this utility model.

[0046] Figure 12 yes Figure 11 Cross-sectional view in the T2-T2 direction.

[0047] Figure 13 yes Figure 11 Enlarged view of region II.

[0048] Figure 14 This is a schematic diagram of the regular folds formed between the third joint of the outer layer sheet in Embodiment 3 of this utility model. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0050] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0051] It should be noted that the terms "upper", "lower", "left", "right", "front", and "back" used in this utility model are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0052] Example 1.

[0053] Combination Figures 1 to 4 According to an embodiment of the present invention, a disposable underwear is provided, comprising a body 20 and an inner lining 10. The disposable underwear, in its unfolded state, has mutually orthogonal longitudinal, transverse, and thickness directions.

[0054] like Figure 1 As shown, in its unfolded state, the main body 20 has a front waist portion B1 disposed on the abdominal side of the wearer, a back portion B2 disposed on the back side of the wearer, and a crotch portion B3 disposed between the front waist portion B1 and the back portion B2 in the longitudinal direction.

[0055] like Figure 1 and Figure 3 As shown, along the horizontal direction, at least on both sides of the crotch B3, there are arc-shaped leg circumference lines 20a. The sides of the front waist B1 and the back B2 are formed by ultrasonic waves or heat pressing to make the disposable underwear form an underwear shape with one waist opening and two leg openings. The leg circumference lines 20a fit the contour of the wearer's legs.

[0056] Laterally, at least the front waistband B1 and the back panel B2 are elastic to allow the waistband (full circle) formed by the body of the disposable underwear to be elastic, thus wrapping around the wearer's abdomen and buttocks. Laterally, the crotch area B3 is elastic.

[0057] like Figure 2 As shown in the embodiment of the present invention, when the disposable underwear of the present invention is in an unfolded and stretched state, it has a skin side that contacts the human body (wearer) along the thickness direction, and a non-skin side away from the skin side.

[0058] Along the thickness direction, the body 20 includes an outer layer 21 located on the non-skin side and an inner layer 22 located on the skin side. Along the thickness direction, in a portion of the crotch area B3, the inner lining 10 is disposed on the skin side of the body 20.

[0059] Specifically, in a portion of the crotch area B3, the inner lining sheet 10 is fixed to the inner surface of the inner layer sheet 22 by the adhesive portion 4b, thereby positioning the inner lining sheet 10 on the skin side of the body 20.

[0060] Combination Figure 1 and Figure 4 According to an embodiment of the present invention, the body 20 has a first center line O1 (imaginary line) extending laterally at its center along the longitudinal direction. The body 20 also has a second center line O2 (imaginary line) extending longitudinally at its center along the transverse direction.

[0061] The leg circumference line 20a includes a concave arc segment 20a' that is recessed longitudinally towards the front waist B1. In the unfolded state, the concave arc segment 20a' intersects with the longitudinal edges 20b on both sides of the front waist B1 to form a first point N1, and the point of the concave arc segment 20a' that is farthest from the first center line O1 is a second point N2, which is located at the front waist B1.

[0062] Along the longitudinal direction, the difference between the perpendicular distance of the second point N2 to the first center line O1 and the perpendicular distance of the first point N1 to the first center line O1 is 5mm to 30mm. Furthermore, along the transverse direction, the perpendicular distance between the second point N2 and the longitudinal edge 20b of the front waist B1 is less than the perpendicular distance between the second point N2 and the second center line O2.

[0063] like Figure 1 As shown, along the horizontal direction, the point closest to the second center line on both sides of the body 20 leg circumference line 20a is the third point N3; along the horizontal direction, the vertical distance between the second point N2 and the longitudinal edges 20b on both sides of the front waist B1 is equal to 1 / 3 to 1 / 2 of the vertical distance between the third point N3 and the longitudinal edges 20b on both sides of the front waist B1.

[0064] like Figure 4As shown, for example, draw a first imaginary line L1 parallel to the first center line O1 through the first point N1, and a second imaginary line L2 parallel to the first center line O1 through the second point N2. The distance between the first imaginary line L1 and the first center line O1 is d1 (i.e., the perpendicular distance between the first point N1 and the first center line O1), and the distance between the second imaginary line L2 and the first center line O1 is d2 (i.e., the perpendicular distance between the second point N2 and the first center line O1).

[0065] Since the concave arc segment 20a' is concave at the waist B1 along the longitudinal direction, the second point N2 is the point of the concave arc segment 20a' that is farthest from the first center line O1, therefore d2 > d1.

[0066] According to an embodiment of this utility model, 5mm < d2 - d1 < 30mm, that is, the difference between the vertical distance between the second point N2 and the first center line O1 and the vertical distance between the first point N1 and the first center line O1 is 5mm to 30mm.

[0067] Draw a third imaginary line L3 parallel to the second center line O2, passing through the second point N2. The distance between the third imaginary line L3 and the longitudinal edge 20b of the front waist B1 is d3 (i.e., the perpendicular distance between the second point N2 and the longitudinal edge 20b of the front waist), and the distance between the third imaginary line L3 and the second center line O2 is d4 (i.e., the perpendicular distance between the second point N2 and the second center line O2). That is, d3 < d4, meaning the perpendicular distance between the second point N2 and the longitudinal edge 20b of the front waist is less than the perpendicular distance between the second point N2 and the second center line O2. In other words, the second point N2 is located closer to the longitudinal edge 20b of the front waist B1.

[0068] Draw a fourth imaginary line L4 parallel to the second center line O2 through the third point N3. The distance between the third imaginary line L3 and the longitudinal edge 20b of the front waist B1 is d3 (that is, the perpendicular distance between the second point N2 and the longitudinal edges 20b on both sides of the front waist B1), and the distance between the fourth imaginary line L4 and the longitudinal edge 20b of the front waist B1 is d5 (that is, the perpendicular distance between the third point N3 and the longitudinal edges 20b on both sides of the front waist B1).

[0069] And d3 = 1 / 3 × d5 ~ 1 / 2 × d5, that is, the vertical distance between the second point N2 and the longitudinal edges 20b on both sides of the front waist B1 is equal to 1 / 3 to 1 / 2 of the vertical distance between the third point N3 and the longitudinal edges 20b on both sides of the front waist B1.

[0070] In the existing technology, the leg circumference line 20a is relatively smooth. When the wearer wears the disposable underwear for a long time or does some large-amplitude leg movements, the area near the front waist B1 of the leg circumference line 20a will become tight around the upper thigh, resulting in a poor wearing experience.

[0071] The present invention includes a concave arc segment 20a' that is recessed longitudinally towards the waist B1, thereby solving the problem of tightness in the thighs in the area of ​​the leg circumference line 20a near the front waist B1.

[0072] However, when d2-d1 > 30mm, the elasticity of the front waist B1 will be affected; when d2-d1 < 5mm, the area of ​​the leg circumference line 20a near the front waist B1 will feel tight around the upper thigh. In this invention, 5mm < d2-d1 < 30mm, meaning the difference between the vertical distance between the second point N2 and the first center line O1 and the vertical distance between the first point N1 and the first center line O1 is 5mm to 30mm, ensures that the elasticity of the front waist B1 is not affected, while preventing the leg circumference line 20a from feeling tight around the upper thigh.

[0073] In this invention, d3 < d4, meaning the vertical distance between the second point N2 and the longitudinal edge 20b of the front waist B1 is less than the vertical distance between the second point N2 and the second center line O2 (the second point N2 is located closer to the longitudinal edge 20b of the front waist B1), and d3 = 1 / 3 × d5 ~ 1 / 2 × d5, meaning the vertical distance between the second point and the longitudinal edges on both sides of the front waist is equal to 1 / 3 to 1 / 2 of the vertical distance between the third point and the longitudinal edges on both sides of the front waist. This makes the elasticity at the position of the second point N2 the weakest, so that the disposable underwear will not be too tight around the thighs when the wearer sits for a long time (such as office workers sitting for a long time).

[0074] Combination Figure 1 and Figure 3 In the crotch area B3, located near the back B2, the leg circumference line 20a has a prominent arc segment 20a", thus giving the crotch area B3 near the back B2 a larger coverage area, thereby better wrapping the wearer's buttocks.

[0075] Combination Figure 1 and Figure 2 According to an embodiment of the present invention, along the thickness direction, in a portion of the crotch area B3, the inner lining 10 is disposed on one side of the body 20 on the skin side.

[0076] Along the transverse direction, the contours of both sides of the inner lining 10 match the contour of the leg circumference line 20a of the crotch area B3, as shown below. Figure 1 As shown. Furthermore, along the longitudinal direction, the two sides of the inner liner 10 are joined to the inner layer 22 by a plurality of first joints 4a.

[0077] Multiple first joints 4a are formed by hot pressing or ultrasonic processes, which are used to reinforce and fix the inner liner 10 on both sides along the longitudinal direction and prevent curling at the edges.

[0078] In a further preferred embodiment, along the transverse direction, the areas on both sides of the inner lining 10 near the leg circumference line 20a are joined to the inner layer 22 by a plurality of first joints 4a. The plurality of first joints 4a are arranged along the contour of the leg circumference line 20a of the crotch portion B3 to prevent the inner lining 10 from opening or cracking in the area near the leg circumference line 20a.

[0079] The inner lining sheet 10 of this utility model can be a single-layer structure, a double-layer composite structure, or a multi-layer composite structure.

[0080] When the inner lining 10 is a single-layer structure, it can be a fabric or non-woven fabric made of absorbent or hydrophilic fibers.

[0081] When the inner liner 10 has a double-layer composite structure, it includes a liquid-permeable surface layer and a liquid-impermeable bottom layer. The liquid-permeable surface layer can be a fabric or nonwoven fabric made of absorbent or hydrophilic fibers, and the fabric or nonwoven fabric can be a single layer or a multi-layer structure. The liquid-impermeable bottom layer can be, for example, PE or PP plastic film, or spunbond nonwoven fabric containing a meltblown layer, or a composite film composed of nonwoven fabric and PE or PP plastic film, etc.

[0082] When the inner liner 10 has a multi-layer composite structure, it comprises a liquid-permeable surface layer, an intermediate absorbent layer, and a liquid-impermeable bottom layer. The liquid-permeable surface layer can be a fabric or nonwoven fabric made of absorbent or hydrophilic fibers, and the fabric or nonwoven fabric can be a single layer or a multi-layer structure. The liquid-impermeable bottom layer can be, for example, a PE or PP plastic film, or a spunbond nonwoven fabric containing a meltblown layer, or a composite film composed of nonwoven fabric and PE or PP plastic film. The intermediate absorbent layer can be composed of a layer containing absorbent fibers, a mixed layer of absorbent fibers and superabsorbent polymers, or a composite liquid-absorbing material layer containing superabsorbent polymers.

[0083] In this embodiment, the inner lining 10 has a multi-layered structure, which provides the wearer with a drier experience.

[0084] like Figure 2 As shown, according to an embodiment of the present invention, along the longitudinal direction, the outer layer 21 has its sides folded towards the skin to form a folded portion 21a. Multiple second elastic lines 24 are disposed between the folded portion 21a and the inner layer 22, and the second elastic lines 24 extend laterally.

[0085] The second elastic thread 24 is fixed between the bent portion 21a and the inner sheet 22 by the second elastic thread adhesive G2. Along the longitudinal direction, the spacing between two adjacent second elastic threads 24 is 3 mm to 12 mm. The multiple second elastic threads 24 have an average dtex of 310 to 940 dtex.

[0086] like Figure 5As shown, the present invention relates to a cutting process for disposable underwear, wherein the upstream process conveys the continuous conveyor body 20C along the MD direction to the cutting process for cutting. Figure 5 In this context, the MD direction refers to the processing direction of disposable underwear, corresponding to the horizontal direction of the disposable underwear. The CD direction refers to the direction perpendicular to the MD direction, corresponding to the vertical direction of the disposable underwear.

[0087] The continuous body 20C conveyed in the upstream process has been laminated (fixed) with the inner lining 10, and arc-shaped leg circumference lines 20a are formed on both sides of the crotch area B3. In the cutting process, the continuous body 20C is cut along the cutting line Q to form individual disposable underwear.

[0088] like Figure 5 As shown, the leg circumference lines 20a of any two adjacent disposable underwear bodies 20 form an approximate "heart" shape, and the front waist B1 of a single disposable underwear body 20 is connected to the front waist B1 of the two disposable underwear bodies 20 adjacent to it on both sides.

[0089] The back B2 of a single disposable underwear body 20 is connected to the back B2 of the two adjacent disposable underwear bodies 20.

[0090] like Figure 6 As shown, in another embodiment, the upstream process conveys a continuous body 20C, and the leg circumference lines 20a of two adjacent disposable underwear bodies 20 form a roughly "peanut" shape. The front waist B1 of a single disposable underwear body 20 is connected to the back B2 of the two adjacent disposable underwear bodies 20 on both sides.

[0091] The back B2 of a single disposable underwear body 20 is connected to the front waistbands B1 of two adjacent disposable underwear bodies on both sides.

[0092] Example 2.

[0093] Combination Figures 7 to 10 In this embodiment, multiple first elastic lines 23 are disposed between the inner layer 22 and the outer layer 21. The first elastic lines 23 extend laterally, and multiple first elastic lines 23 are arranged longitudinally at intervals in the front waist area B1, crotch area B3, and back area B2, as shown below. Figure 7 and Figure 8 As shown.

[0094] The first elastic thread 23 is fixed between the inner layer sheet 22 and the outer layer sheet 21 by the first elastic thread adhesive G1. Along the longitudinal direction, the spacing between two adjacent first elastic threads is 2mm to 8mm.

[0095] Specifically, the outer periphery of multiple first elastic threads 23 is continuously coated with a first elastic thread adhesive G1, thereby fixing the multiple first elastic threads 23 between the outer layer sheet 21 and the inner layer sheet 22. The dosage of the first elastic thread adhesive G1 is 0.0015 to 0.015 g / m / thread; the first elastic threads 23 have an average fractional density of 50 dtex to 600 dtex.

[0096] In this embodiment, compared with conventional disposable underwear where the first elastic line 23 is arranged only at intervals in the front waist B1 and back B2, the first elastic line 23 is arranged not only at intervals in the front waist B1 and back B2 but also at intervals in the crotch B3. This makes the disposable underwear not only horizontally elastic in the front waist B1 and back B2 due to the stretching and contraction of the first elastic line 23, but also horizontally elastic in the crotch B3 due to the stretching and contraction of the first elastic line 23. This avoids the crotch-squeezing and loose fit that occurs in existing disposable underwear due to the lack of elasticity in the crotch B3, thus improving the fit and coverage of the crotch B3.

[0097] like Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, at least in the front waist region B1 and the rear back region B2, the inner layer sheet 22 and the outer layer sheet 21 are joined together by an array of multiple second joints 40. The multiple second joints 40 are formed by hot pressing or ultrasonic processing.

[0098] like Figure 9 As shown, multiple second joints 40 are arranged in rows along the transverse direction and roughly in columns along the longitudinal direction. Along the longitudinal direction, there is at least one row of second joints 40 between two adjacent first elastic lines 23, that is, multiple first elastic lines 23 and second joints 40 are arranged in a staggered manner along the longitudinal direction.

[0099] When the first elastic line 23 contracts laterally, at least at the front waist B1 and the back B2, the inner layer 22 and the outer layer 21 contract with the first elastic line 23, forming regular folds M between the plurality of second joints 40, such as... Figure 10 As shown.

[0100] The shape of the second joint 40 can be elliptical, circular, strip-shaped, or other regular or irregular shapes. The arrangement of multiple second joints 40 along the longitudinal direction can be linear, diagonal, curved, or multi-segment line. In this embodiment, the arrangement of multiple second joints 40 along the longitudinal direction is curved, such as... Figure 9 As shown.

[0101] like Figure 8As shown, along the longitudinal direction, the outer layer 21 is folded towards the skin on both sides to form a folded portion 21a. Multiple second elastic lines 24 are disposed between the folded portion 21a and the inner layer 22, and the second elastic lines 24 extend laterally.

[0102] The second elastic thread 24 is fixed between the bent portion 21a and the inner sheet 22 by the second elastic thread adhesive G2. Along the longitudinal direction, the spacing between two adjacent second elastic threads 24 is 3 mm to 12 mm. The multiple second elastic threads 24 have an average dtex of 310 to 940 dtex.

[0103] The other structures of the disposable underwear in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0104] Example 3.

[0105] Combination Figures 11 to 14 In this embodiment, the inner layer 22 is made of a stretchable nonwoven fabric that is elastic in the transverse direction; the outer layer 21 is made of a non-stretchable nonwoven fabric. No first elastic thread 23 is provided between the inner layer 22 and the outer layer 21.

[0106] The materials for stretch nonwoven fabrics can include various well-known types such as spunbond nonwoven fabrics, dot-bonded nonwoven fabrics, hot-air nonwoven fabrics, chemical nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, and needle-punched nonwoven fabrics. The resins used in stretch nonwoven fabrics can be synthetic rubber resins composed of polystyrene and polyurethane, thermoplastic resins composed of polyethylene, polypropylene, polyester, and acrylic, polyolefin resins, and polyester resins.

[0107] The stretchable nonwoven fabric is manufactured using known stretching techniques such as gear processing, thereby giving the stretchable nonwoven fabric stretchability in the transverse direction, thus making the inner layer sheet 22 stretchable in the transverse direction.

[0108] In some embodiments, the stretching process can be adjusted to give the stretchable nonwoven fabric both lateral and longitudinal stretchability.

[0109] For non-stretch nonwoven fabrics, various well-known non-stretch nonwoven fabrics can be selected, including spunbond nonwoven fabrics, SMS nonwoven fabrics, dot-bonded nonwoven fabrics, hot-air nonwoven fabrics, spunlace nonwoven fabrics, and needle-punched nonwoven fabrics. The fibers used in non-stretch nonwoven fabrics can be core-sheath composite fibers or parallel composite fibers formed from polypropylene, polyolefins, polyesters, polyamides, or polyethylene / polypropylene, polyethylene / polyester. The basis weight of non-stretch nonwoven fabrics ranges from 10 to 45 g / m². 2 .

[0110] like Figure 11 , Figure 12 , Figure 13 and Figure 14As shown, the inner layer 22 (stretchable nonwoven fabric) and the outer layer 21 (non-stretchable nonwoven fabric) are joined together by an array of multiple third joints 40'. The third joints 40' are spaced apart along the transverse direction, as shown... Figure 13 As shown.

[0111] The plurality of third joints 40' are formed by an ultrasonic process. In some embodiments, the plurality of third joints 40' may also be formed by bonding methods such as heat sealing and hot melt adhesives.

[0112] When the inner layer 22 contracts laterally, the outer layer 21 contracts along with the inner layer 22, forming regular folds M between the multiple third joints 40'. The folds M extend longitudinally, such as... Figure 14 As shown.

[0113] In some embodiments, the pleats M can be arranged at approximately equal intervals in the lateral direction by adjusting the spacing of the third joint 40'.

[0114] like Figure 12 As shown, along the longitudinal direction, the outer layer 21 is folded towards the skin on both sides to form a folded portion 21a. Multiple second elastic lines 24 are disposed between the folded portion 21a and the inner layer 22, and the second elastic lines 24 extend laterally.

[0115] The second elastic thread 24 is fixed between the bent portion 21a and the inner sheet 22 by the second elastic thread adhesive G2. Along the longitudinal direction, the spacing between two adjacent second elastic threads 24 is 3 mm to 12 mm. The multiple second elastic threads 24 have an average dtex of 310 to 940 dtex.

[0116] The other structures of the disposable underwear in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0117] The following points need to be explained:

[0118] (1) The accompanying drawings of this utility model embodiment only involve the structure involved in this utility model embodiment. Other structures can refer to the general design.

[0119] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present invention, i.e., these drawings are not drawn to actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "below" another element, the element may be "directly" located "on" or "below" the other element or there may be intermediate elements.

[0120] (3) Where there is no conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other to obtain new embodiments.

[0121] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. The protection scope of this utility model shall be determined by the protection scope of the claims.

Claims

1. A disposable pair of underwear, characterized in that, The disposable underwear, when unfolded, has mutually orthogonal longitudinal, transverse, and thickness directions; The disposable underwear includes at least a body; along the thickness direction, the body includes at least an outer layer and an inner layer; in the unfolded state, the body has a front waist portion disposed on the abdominal side of the wearer, a back portion disposed on the back side of the wearer, and a crotch portion disposed between the front waist portion and the back portion in the longitudinal direction. Along the horizontal direction, at least on both sides of the crotch area, there are arc-shaped leg circumference lines. The front waist and the back sides are formed with side seals by ultrasonic waves or heat pressing, so that the disposable underwear is formed into underwear shape with one waist opening and two leg openings. Along the longitudinal direction, the center of the body has a first center line extending laterally; along the lateral direction, the center of the body has a second center line extending longitudinally. The leg circumference line includes a concave arc segment that is recessed longitudinally toward the front waist; in the unfolded state, the concave arc segment intersects with the longitudinal edges on both sides of the front waist to form a first point, and the point on the concave arc segment that is farthest from the first center line is a second point, which is located in the front waist. Along the longitudinal direction, the difference between the vertical distance of the second point and the vertical distance of the first point and the first center line is 5mm to 30mm. Furthermore, in the transverse direction, the vertical distance between the second point and the longitudinal edge of the front waist is less than the vertical distance between the second point and the second center line.

2. The disposable underwear according to claim 1, characterized in that, Along the transverse direction, the point on both sides of the body where the leg circumference line is closest to the second center line is the third point; Along the transverse direction, the vertical distance between the second point and the longitudinal edges on both sides of the front waist is equal to 1 / 3 to 1 / 2 of the vertical distance between the third point and the longitudinal edges on both sides of the front waist.

3. The disposable underwear according to claim 1, characterized in that, In the crotch area, in the region near the back, the leg circumference has a prominent curved segment.

4. The disposable underwear according to claim 1, characterized in that, The disposable underwear also includes an inner lining; Along the thickness direction, in a portion of the crotch area, the inner lining is disposed on one side of the body skin.

5. The disposable underwear according to claim 4, characterized in that, In a portion of the crotch area, the inner lining sheet is fixed to the inner surface of the inner layer sheet by an adhesive portion, thereby positioning the inner lining sheet on the skin side of the body.

6. The disposable underwear according to claim 5, characterized in that, Along the longitudinal direction, the two sides of the inner liner sheet are joined to the inner layer sheet through a plurality of first joints; Along the transverse direction, the two sides of the inner lining sheet are joined to the inner layer sheet by a plurality of first joints, which are arranged along the contour of the leg circumference of the crotch area.

7. The disposable underwear according to claim 1, characterized in that, Multiple first elastic threads are disposed between the inner layer and the outer layer; the first elastic threads extend laterally, and multiple first elastic threads are arranged longitudinally at intervals in the front waist, crotch and back. The first elastic thread is fixed between the inner layer and the outer layer by a first elastic thread adhesive; the first elastic thread has an average denier of 50 dtex to 600 dtex; along the longitudinal direction, the spacing between two adjacent first elastic threads is 2 mm to 8 mm.

8. The disposable underwear according to claim 7, characterized in that, At least in the front waist and back, the inner sheet and the outer sheet are joined together by an array of multiple second joints; Along the longitudinal direction, there is at least one row of second joints between two adjacent first elastic lines; when the first elastic lines contract laterally, at least in the front waist and back, the inner sheet and the outer sheet form regular folds between a plurality of second joints.

9. The disposable underwear according to claim 1, characterized in that, The inner layer is made of stretchable nonwoven fabric that is elastic in the transverse direction; the outer layer is made of non-stretchable nonwoven fabric. The inner layer and the outer layer are joined together by an array of third joints; the third joints are spaced apart along the transverse direction. When the inner sheet contracts laterally, the outer sheet forms regular folds between the plurality of third joints.

10. The disposable underwear according to claim 1, 7, or 9, characterized in that, Along the longitudinal direction, the outer layer sheet is folded inwards towards the skin to form a folded portion; Multiple second elastic lines are disposed between the bent portion and the inner layer sheet, and the second elastic lines extend laterally. The second elastic thread is fixed between the bent portion and the inner sheet by a second elastic thread adhesive; the second elastic thread has an average dtex of 310 dtex to 940 dtex; along the longitudinal direction, the spacing between two adjacent second elastic threads is 3 mm to 12 mm.

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