Invisible underpants with an Anti-embarrassment crotch structure

Abstract

A pair of invisible underpants with an anti-embarrassment crotch structure includes an underparts body including a front panel and a back panel; the front panel features a crotch with an inner lining structure, including a skin-contact layer, a control layer, and a protective layer sequentially stacked, forming a crotch gusset structure; the control layer is layered on the outer side of the protective layer, with its four edges inset to form a first step; the protective layer is smaller than the skin-contact layer, with its four edges inset to form a second step; the skin-contact layer is layered on the outer side of the control layer, with a smaller area than the front panel, and its four edges inset to form a third step; the edge of the skin-contact layer is bonded to those of the protective layer and the front panel, forming a continuous stepped edge sealing structure.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims priority to Chinese Patent Application No. 202520505736.8, filed on March 20, 2025, the content of which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] The present disclosure belongs to the field of underpants technology, particularly relating to a pair of invisible underpants with an anti-embarrassment crotch structure.BACKGROUND

[0003] In the modern apparel market, consumers, as their living standards improve, have higher demands for comfort and functionality in intimate apparel. Underpants, an indispensable part of women’s daily attire, primarily serve to protect the private areas of women and assist in maintaining personal hygiene, while also requiring high comfort and elasticity. For example, in existing technology, Chinese Patent CN200944830Y discloses sanitary underpants that incorporate an antibacterial nonwoven fabric between an outer layer cloth and an inner layer cloth, providing breathability, moisture absorption, sterilization, and deodorization during wear.

[0004] However, besides functions such as breathability, moisture absorption, antibacterial properties, and odor elimination, underwear must also conceal the contours of a woman’s physiological structure, preventing embarrassing lines from appearing during physical activities and avoiding the exposure of the shape of the female anatomy—camel toe. Thus, anti-embarrassment underwear has emerged in the market. This type of anti-embarrassment underwear commonly adopts a one-piece thickened sponge material as its core functional component, using a dense sponge layer in the crotch area to effectively conceal the contours of the female physiology, providing users with a more private and confident wearing experience.

[0005] Yet, this anti-embarrassment underwear reveals a series of issues in actual use. First, due to the relatively thick sponge material, the edges of the underwear tend to form noticeable outlines, which remain visible even under tight or sheer outerwear, undermining the product’s invisible, no-mark effect and still potentially causing embarrassment for the wearer. Second, the internal structure of the sponge is quite dense, resulting in poor breathability that fails to meet the body’s heat dissipation needs during physical activity, easily causing a stuffy sensation; when sweating, although the sponge quickly absorbs sweat, its poor breathability prevents rapid evaporation, leaving the crotch area persistently damp, reducing wearing comfort and potentially exacerbating bacterial growth, posing a potential threat to women’s intimate health.SUMMARY

[0006] To address the problems in related technologies, this disclosure proposes invisible underpants with an anti-embarrassment crotch structure, overcoming the aforementioned technical drawbacks of existing related technologies. By placing the crotch on the front panel covering the user’s private area, this crotch is equipped with a unique inner lining structure that effectively prevents the appearance of embarrassing lines at the crotch. The thickness of the crotch gusset structure is significantly less than that of the sponge used in conventional technology, maintaining anti-embarrassment performance while fully considering the breathability and moisture absorption of invisible underpants, helping keep the intimate area dry and comfortable.

[0007] The technical solution of this disclosure is implemented as follows: a pair of invisible underpants with an anti-embarrassment crotch structure, including an underparts body; the underparts body includes a front panel and a back panel connected together, the front panel having a crotch covering a user’s private area, the crotch including an inner lining structure located on an inner side of the front panel, the inner lining structure serving to support the crotch to prevent the appearance of embarrassing lines at the crotch; where the inner lining structure includes a skin-contact layer, a control layer, and a protective layer; the skin-contact layer, the control layer, and the protective layer are sequentially stacked on the front panel, forming a crotch gusset structure with an edge thickness varying stepwise; the control layer is stacked on a side of the protective layer facing the body and has an area smaller than that of the protective layer, and four edges thereof are inset to form a first step; the protective layer has an area smaller than that of the skin-contact layer, and four edges thereof are inset to form a second step; the skin-contact layer is stacked on a side of the control layer facing the body and has an area smaller than that of the front panel, and four edges thereof are inset to form a third step; and an edge of the skin-contact layer is respectively bonded to an edge of the protective layer and the front panel, forming a continuous stepped edge sealing structure.

[0008] Further, one side of the control layer is fully bonded to the protective layer; the control layer comprises non-stretch mesh fabric or is made from non-stretch mesh fabric; the control layer has a thickness in a range from 1.0mm to 2.0mm.

[0009] Further, a spacing between the first step and the second step is less than a spacing between the second step and the third step; the edge thickness of the crotch gusset structure decreases stepwise from inside outward.

[0010] Further, a bottom of the front panel is connected to a bottom of the back panel, forming a first connecting part; when the underparts body is laid flat, the first connecting part is located at a rear side of the underparts body; a bottom of the skin-contact layer extends away from the back panel until overlapping with the first connecting part. The skin-contact layer may be made of a skin-friendly, breathable material (e.g., cotton fabric).

[0011] Further, the skin-contact layer comprises an upper edge line and a lower edge line; the upper edge line extends toward a waistband, and the lower edge line extends toward the first connecting part; left and right sides of the inner lining structure are gradually narrow and transition from the upper edge line to the lower edge line.

[0012] Further, both the upper edge line and the lower edge line are arc-shaped, wavy, or straight;

[0013] Even further, the shapes of the skin-contact layer, the control layer, and the protective layer are all inverted trapezoidal, inverted triangular, or fan-shaped.

[0014] Further, two sides of the front panel are connected to corresponding sides of the back panel through conforming fit and / or stitching, forming a second connecting part; when the underparts body is laid flat, the second connecting part is located on a front side of the underparts body.

[0015] Further, the inner lining structure further comprises a padding layer arranged between the skin-contact layer and the control layer, wherein one surface of the padding layer is fully bonded to the control layer, and the other surface is not bonded to the skin-contact layer.

[0016] Further, the crotch gusset structure has a central thickness in a range from 3.0 to 18.0mm, and an edge transition thickness in a range from 0.1 to 8.0 mm.

[0017] Further, a shape and an area size of the padding layer are identical to those of the control layer.

[0018] Further, both the padding layer and the protective layer are made of sandwich-structure materials, with a thickness range of 1.0mm-5.0mm, preferably 1.0 mm in this disclosure.

[0019] Further, the sandwich-structure material exhibits excellent breathability and elasticity, with its elasticity exceeding that of non-stretch mesh fabric.

[0020] Advantages of the present disclosure are as follows.

[0021] (1) The present disclosure provides a crotch area on the front panel covering the user’s private area, equipped with a unique inner lining structure that effectively prevents embarrassing lines from appearing at the crotch. This design fully considers users’ privacy needs during wear, ensuring the crotch area remains flat and invisible under any activity, greatly enhancing confidence and comfort during use.

[0022] (2) The inner lining structure of the present disclosure adopts a three-layer stacked design consisting of a skin-contact layer, a control layer, and a protective layer. The edge of each layer is inset to form a stepped variation, ultimately conforming and connecting with the front panel to create a continuous stepped edge sealing structure. This not only enhances support at the crotch area but also ensures a more natural and smooth transition at the edge of the underparts body, eliminating the abrupt sensation often found in traditional underpants, further improving wearing comfort and aesthetic appeal.BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a rear view of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0024] FIG. 2 is a front view of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0025] FIG. 3 is a structural unfolding diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0026] FIG. 4 is another structural unfolding diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0027] FIG. 5 is a structural disassembly diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0028] FIG. 6 is a cross-sectional view of the crotch gusset structure in Example 1;

[0029] FIG. 7 is a structural diagram of the crotch gusset structure in Example 1;

[0030] FIG. 8 is a structural disassembly diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 2;

[0031] FIG. 9 is a cross-sectional view of the crotch gusset structure in Embodiment 2.Description of reference signs:

[0032] 1, Front Panel; 11, Crotch; 2, Back Panel; 3, Inner Lining Structure; 31, Skin-Contact Layer; 311, Upper Edge Line; 312, Lower Edge Line; 32, Padding Layer; 33, Control Layer; 34, Protective Layer; 4, Crotch Gusset Structure; 5, Stepped Edge Sealing Structure; 51, First Step; 52, Second Step; 53, Third Step; 6, First Connecting Part; 7, Second Connecting Part; 8, Waistband.DESCRIPTION OF EMBODIMENTS

[0033] Below, with reference to the drawings in the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure will be described clearly and completely. It is obvious that the described embodiments are only part of the present disclosure, not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary skilled persons in the field without creative work fall within the scope protected by the present disclosure.

[0034] In the description of the present disclosure, it shall be appreciated that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicating direction or positional relationships are based on the directions or positional relationships shown in the drawings, merely for facilitating the description of the present disclosure and simplifying descriptions, and not intended to indicate or imply that the specified device or component must have specific orientations, constructions, or operations, thus they should not be construed as limiting the present disclosure.Embodiment 1

[0035] As shown in FIGS. 1-7, this embodiment provides a pair of invisible underpants with an anti-embarrassment crotch structure, including an underparts body; the underparts body includes a front panel 1 and a back panel 2 connected together, the front panel 1 having a crotch 11 covering the user’s private area, the crotch 11 includes an inner lining structure 3 located on the inner side of the front panel 1, and the inner lining structure 3 is configured to support the crotch 11 to prevent embarrassing lines from showing through.

[0036] The inner lining structure 3 includes a skin-contact layer 31, a control layer 33, and a protective layer 34; the skin-contact layer 31, the control layer 33, the protective layer 34, and the front panel 1 are stacked in sequence to form a crotch gusset structure 4 with an edge thickness varying stepwise.

[0037] The control layer 33 is stacked on a side of the protective layer 34 facing the body, with an area smaller than that of the protective layer 34, and its four edges are inset to form a first step 51; the protective layer 34 has an area smaller than the skin-contact layer 31, and its four edges are inset to form a second step 52; the skin-contact layer 31 is stacked on a side of the control layer 33 facing the body, with an area smaller than the front panel 1, and its four edges are inset to form a third step 53.

[0038] An edge of the skin-contact layer 31 is respectively bonded to edges of the protective layer 34 and the front panel 1, forming a continuous stepped edge sealing structure 5.

[0039] First, this embodiment provides a crotch 11 covering the user’s private area on the front panel 1, which also features a unique inner lining structure 3, effectively preventing potential embarrassing lines at the crotch 11. This design fully considers users’ privacy needs during wear, ensuring the crotch 11 remains flat and invisible under any activity state, greatly enhancing confidence and comfort during wearing.

[0040] Moreover, the inner lining structure 3 of this embodiment adopts a three-layer stacked design of the skin-contact layer 31, control layer 33, and protective layer 34, with each layer’s edge being inset to form a stepped variation, ultimately bonded to the front panel 1 to create a continuous stepped edge sealing structure 5. This not only enhances support at the crotch 11 but also ensures a more natural and smooth transition at the edge of the underparts body, eliminating the abrupt sensation often found in traditional underwear edges, further improving comfort and appearance.

[0041] Additionally, the crotch gusset structure 4, through a multi-layer stacked design, has a thickness significantly less than that of sponge in existing technologies. While maintaining anti-embarrassment performance, it also fully considers breathability and moisture absorption of invisible underpants, helping keep the private area dry and comfortable, reducing bacterial growth, thus contributing to personal hygiene and health.

[0042] Specifically, one side of the control layer 33 is fully bonded to the protective layer 34; the control layer 33 includes non-stretch mesh fabric or is made from non-stretch mesh fabric.

[0043] The placement of the control layer 33 achieves both force control and ensures the anti-embarrassment structure remains untwisted and flat during wear and movement, effectively preventing embarrassing situations.

[0044] Specifically, the thickness range of the control layer 33 is 1.0mm-2.0mm, maintaining the thinness of the crotch gusset structure 4.

[0045] Specifically, a spacing between the first step 51 and the second step 52 is smaller than a spacing of the second step 53; the edge thickness of the crotch gusset structure 4 decreases stepwise from inside to outside.

[0046] The design of the step spacing creates a reasonable transition zone between the skin-contact layer 31, the control layer 33, and the protective layer 34. The smaller spacing between the first step 51 and the second step 52 helps reduce friction between layers, minimizing foreign-body sensation during wear and thereby enhancing comfort. Meanwhile, the stepwise reduction in edge thickness from inside to outside makes the underpants’ edge smoother, reducing skin pressure during wear and further improving comfort.

[0047] Specifically, the bottom of the front panel 1 is connected to the bottom of the back panel 2, forming the first connecting part 6; when the underparts body is laid flat, the first connecting part 6 is located on the rear side of the underparts body; the bottom of the skin-contact layer 31 extends away from the back panel 2 until overlapping with the first connecting part 6.

[0048] The posterior placement of the first connecting part 6 helps avoid friction against the body’s intimate areas, enhancing comfort.

[0049] Specifically, the skin-contact layer 31 includes the upper edge line 311 and the lower edge line 312; the upper edge line 311 extends toward the waistband 8, while the lower edge line 312 extends toward the first connecting part 6; the left and right sides of the inner lining structure 3 gradually narrow from the upper edge line 311 to the lower edge line 312.

[0050] Specifically, both the upper edge line 311 and the lower edge line 312 have arc-shaped, wavy, or straight shapes; this embodiment does not limit the shape of the upper edge line 311 and the lower edge line 312, which may also be any common shape beyond the above.

[0051] More specifically, the shapes of the skin-contact layer 31, the control layer 33, and the protective layer 34 are all trapezoidal, inverted triangular, or fan-shaped; this embodiment does not limit the shapes of the skin-contact layer 31, the control layer 33, and the protective layer 34, which may also be any common shape beyond the above.

[0052] Specifically, the two sides of the front panel 1 are respectively connected to the corresponding sides of the back panel 2 through conforming fit and / or stitching, forming the second connecting part 7; when the underparts body is laid flat, the second connecting part 7 is located on the front side of the underparts body.

[0053] It should be noted that, besides conforming fit and stitching, other common connection methods also provide equivalent technical effects.

[0054] In this embodiment, by connecting the two sides of the front panel 1 to the two sides of the back panel 2 to form the second connecting part 7, and positioning it on the front side of the underparts body when laid flat, a forward shift is achieved compared to the traditional side bone position. This design significantly enhances the support force of the front panel 1 on both sides, effectively strengthening the overall fixation of the underpants. When the underpants are worn, even during vigorous activities, the central portion of the front panel 1 is unlikely to slide down, thus maintaining the stability and comfort of the invisible underpants.Embodiment 2

[0055] As shown in FIGS. 8-9, this embodiment further provides another type of invisible underpants with an anti-embarrassment crotch structure. Features not explained in this embodiment may refer to those in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 lies in the following.

[0056] The inner lining structure 3 further includes a padding layer 32 arranged between the skin-contact layer 31 and the control layer 33. One surface of the padding layer 32 is fully bonded to the control layer 33, while the other surface is not bonded to the skin-contact layer 31. The padding layer 32 is used to elevate the central portion of the crotch 11, further filling the concave area of the user’s private region, visually presenting a smooth outer surface and further preventing the appearance of embarrassing lines.

[0057] Specifically, a thickness of the central portion of the crotch gusset structure 4 is 3.0-18.0mm.

[0058] More specifically, without the padding layer 32, the thickness of the central portion of the crotch gusset structure 4 is thickness of the central portion of; when the padding layer 32 is present, the thickness of the central portion of the crotch gusset structure 4 is 8.0-12.0mm. This thickness range ensures sufficient support for the invisible underpants while avoiding discomfort caused by excessive thickness.

[0059] An edge transition thickness of the crotch gusset structure 4 is 0.1–8.0 mm, which makes the edge of the crotch gusset structure 4 smoother; meanwhile, the smooth transition also helps improve the conforming fit between the invisible underpants and the body, reducing shifting during movement.

[0060] Specifically, the shape and area size of the padding layer 32 are identical to those of the control layer 33.

[0061] Specifically, both the padding layer 32 and the protective layer 34 are made of a sandwich-structure material, with a thickness range of 1.0 mm to 5.0 mm. In this embodiment, 1.0 mm is preferentially selected to maintain the thinness of the inner lining structure 3, further preventing noticeable contours from forming in the crotch 11 during wear, achieving the effect of invisible, mark-free underpants.

[0062] The sandwich-structure material exhibits excellent breathability and elasticity, wherein the elasticity of the sandwich-structure material is greater than that of the non-stretch mesh fabric.

[0063] In this embodiment, the sandwich-structure material is a fabric name, scientifically known as high-molecular synthetic fiber yarn, specifically described as follows.

[0064] The primary raw material of the sandwich-structure material is high-molecular synthetic fiber yarn, which is refined from petroleum. The sandwich-structure material is typically woven by a warp-knitting machine, consisting of three layers: top, middle, and bottom. The surface usually features a mesh design, the middle layer is MOLO yarn connecting the surface and base, and the bottom is a tightly woven plain surface.

[0065] The three-dimensional mesh structure of the sandwich-structure material provides good breathability and moderate adjustability, earning it the nickname "breathable mesh fabric." This three-dimensional mesh structure promotes smooth airflow and ensures surface dryness and comfort. Meanwhile, when subjected to external force, the three-dimensional mesh structure can extend and return to its original shape after the force is removed, offering excellent cushioning protection. Moreover, the lightweight nature of the three-dimensional mesh structure allows it to withstand hand washing, machine washing, and dry cleaning, making it easy to clean and quick to air-dry.

[0066] The sandwich-structure material has undergone anti-mold and antibacterial treatment, effectively inhibiting bacterial growth and maintaining hygiene.

[0067] The sandwich-structure material is also produced using a knitted warp-knitting method, making it strong and durable, capable of withstanding high tensile and tearing forces.

[0068] In Embodiment 2, it should be noted that some users have the habit of removing pubic hair, which makes the depression in the intimate area more pronounced; thus, adding a padding layer 32 further fills the depressed area. Users without the habit of removing pubic hair only need the invisible underpants in Embodiment 1; if such users adopt the invisible underpants in Embodiment 2, although the padding layer 32 can fill the depression, its outer surface may appear protruding. Additionally, slight variations exist in the depression areas among individuals; users may select the appropriate invisible underpants with an anti-embarrassment crotch structure based on their personal needs.

[0069] Based on the disclosure and teachings provided above, those skilled in the art within the field of this disclosure may make alterations and modifications to the aforementioned embodiments. Therefore, this disclosure is not limited to the specific embodiments disclosed and described above, and any modifications or changes to this disclosure should fall within the scope of protection defined by the claims. Furthermore, although certain specific terms are used in this description, they are merely for convenience in explanation and do not impose any limitations on this disclosure.

Examples

embodiment 1

[0035]As shown in FIGS. 1-7, this embodiment provides a pair of invisible underpants with an anti-embarrassment crotch structure, including an underparts body; the underparts body includes a front panel 1 and a back panel 2 connected together, the front panel 1 having a crotch 11 covering the user’s private area, the crotch 11 includes an inner lining structure 3 located on the inner side of the front panel 1, and the inner lining structure 3 is configured to support the crotch 11 to prevent embarrassing lines from showing through.

[0036]The inner lining structure 3 includes a skin-contact layer 31, a control layer 33, and a protective layer 34; the skin-contact layer 31, the control layer 33, the protective layer 34, and the front panel 1 are stacked in sequence to form a crotch gusset structure 4 with an edge thickness varying stepwise.

[0037]The control layer 33 is stacked on a side of the protective layer 34 facing the body, with an area smaller than that of the protective layer 3...

embodiment 2

[0055]As shown in FIGS. 8-9, this embodiment further provides another type of invisible underpants with an anti-embarrassment crotch structure. Features not explained in this embodiment may refer to those in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 lies in the following.

[0056]The inner lining structure 3 further includes a padding layer 32 arranged between the skin-contact layer 31 and the control layer 33. One surface of the padding layer 32 is fully bonded to the control layer 33, while the other surface is not bonded to the skin-contact layer 31. The padding layer 32 is used to elevate the central portion of the crotch 11, further filling the concave area of the user’s private region, visually presenting a smooth outer surface and further preventing the appearance of embarrassing lines.

[0057]Specifically, a thickness of the central portion of the crotch gusset structure 4 is 3.0-18.0mm.

[0058]More specifically, without th...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims priority to Chinese Patent Application No. 202520505736.8, filed on March 20, 2025, the content of which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] The present disclosure belongs to the field of underpants technology, particularly relating to a pair of invisible underpants with an anti-embarrassment crotch structure.BACKGROUND

[0003] In the modern apparel market, consumers, as their living standards improve, have higher demands for comfort and functionality in intimate apparel. Underpants, an indispensable part of women’s daily attire, primarily serve to protect the private areas of women and assist in maintaining personal hygiene, while also requiring high comfort and elasticity. For example, in existing technology, Chinese Patent CN200944830Y discloses sanitary underpants that incorporate an antibacterial nonwoven fabric between an outer layer cloth and an inner layer cloth, providing breathability, moisture absorption, sterilization, and deodorization during wear.

[0004] However, besides functions such as breathability, moisture absorption, antibacterial properties, and odor elimination, underwear must also conceal the contours of a woman’s physiological structure, preventing embarrassing lines from appearing during physical activities and avoiding the exposure of the shape of the female anatomy—camel toe. Thus, anti-embarrassment underwear has emerged in the market. This type of anti-embarrassment underwear commonly adopts a one-piece thickened sponge material as its core functional component, using a dense sponge layer in the crotch area to effectively conceal the contours of the female physiology, providing users with a more private and confident wearing experience.

[0005] Yet, this anti-embarrassment underwear reveals a series of issues in actual use. First, due to the relatively thick sponge material, the edges of the underwear tend to form noticeable outlines, which remain visible even under tight or sheer outerwear, undermining the product’s invisible, no-mark effect and still potentially causing embarrassment for the wearer. Second, the internal structure of the sponge is quite dense, resulting in poor breathability that fails to meet the body’s heat dissipation needs during physical activity, easily causing a stuffy sensation; when sweating, although the sponge quickly absorbs sweat, its poor breathability prevents rapid evaporation, leaving the crotch area persistently damp, reducing wearing comfort and potentially exacerbating bacterial growth, posing a potential threat to women’s intimate health.SUMMARY

[0006] To address the problems in related technologies, this disclosure proposes invisible underpants with an anti-embarrassment crotch structure, overcoming the aforementioned technical drawbacks of existing related technologies. By placing the crotch on the front panel covering the user’s private area, this crotch is equipped with a unique inner lining structure that effectively prevents the appearance of embarrassing lines at the crotch. The thickness of the crotch gusset structure is significantly less than that of the sponge used in conventional technology, maintaining anti-embarrassment performance while fully considering the breathability and moisture absorption of invisible underpants, helping keep the intimate area dry and comfortable.

[0007] The technical solution of this disclosure is implemented as follows: a pair of invisible underpants with an anti-embarrassment crotch structure, including an underparts body; the underparts body includes a front panel and a back panel connected together, the front panel having a crotch covering a user’s private area, the crotch including an inner lining structure located on an inner side of the front panel, the inner lining structure serving to support the crotch to prevent the appearance of embarrassing lines at the crotch; where the inner lining structure includes a skin-contact layer, a control layer, and a protective layer; the skin-contact layer, the control layer, and the protective layer are sequentially stacked on the front panel, forming a crotch gusset structure with an edge thickness varying stepwise; the control layer is stacked on a side of the protective layer facing the body and has an area smaller than that of the protective layer, and four edges thereof are inset to form a first step; the protective layer has an area smaller than that of the skin-contact layer, and four edges thereof are inset to form a second step; the skin-contact layer is stacked on a side of the control layer facing the body and has an area smaller than that of the front panel, and four edges thereof are inset to form a third step; and an edge of the skin-contact layer is respectively bonded to an edge of the protective layer and the front panel, forming a continuous stepped edge sealing structure.

[0008] Further, one side of the control layer is fully bonded to the protective layer; the control layer comprises non-stretch mesh fabric or is made from non-stretch mesh fabric; the control layer has a thickness in a range from 1.0mm to 2.0mm.

[0009] Further, a spacing between the first step and the second step is less than a spacing between the second step and the third step; the edge thickness of the crotch gusset structure decreases stepwise from inside outward.

[0010] Further, a bottom of the front panel is connected to a bottom of the back panel, forming a first connecting part; when the underparts body is laid flat, the first connecting part is located at a rear side of the underparts body; a bottom of the skin-contact layer extends away from the back panel until overlapping with the first connecting part. The skin-contact layer may be made of a skin-friendly, breathable material (e.g., cotton fabric).

[0011] Further, the skin-contact layer comprises an upper edge line and a lower edge line; the upper edge line extends toward a waistband, and the lower edge line extends toward the first connecting part; left and right sides of the inner lining structure are gradually narrow and transition from the upper edge line to the lower edge line.

[0012] Further, both the upper edge line and the lower edge line are arc-shaped, wavy, or straight;

[0013] Even further, the shapes of the skin-contact layer, the control layer, and the protective layer are all inverted trapezoidal, inverted triangular, or fan-shaped.

[0014] Further, two sides of the front panel are connected to corresponding sides of the back panel through conforming fit and / or stitching, forming a second connecting part; when the underparts body is laid flat, the second connecting part is located on a front side of the underparts body.

[0015] Further, the inner lining structure further comprises a padding layer arranged between the skin-contact layer and the control layer, wherein one surface of the padding layer is fully bonded to the control layer, and the other surface is not bonded to the skin-contact layer.

[0016] Further, the crotch gusset structure has a central thickness in a range from 3.0 to 18.0mm, and an edge transition thickness in a range from 0.1 to 8.0 mm.

[0017] Further, a shape and an area size of the padding layer are identical to those of the control layer.

[0018] Further, both the padding layer and the protective layer are made of sandwich-structure materials, with a thickness range of 1.0mm-5.0mm, preferably 1.0 mm in this disclosure.

[0019] Further, the sandwich-structure material exhibits excellent breathability and elasticity, with its elasticity exceeding that of non-stretch mesh fabric.

[0020] Advantages of the present disclosure are as follows.

[0021] (1) The present disclosure provides a crotch area on the front panel covering the user’s private area, equipped with a unique inner lining structure that effectively prevents embarrassing lines from appearing at the crotch. This design fully considers users’ privacy needs during wear, ensuring the crotch area remains flat and invisible under any activity, greatly enhancing confidence and comfort during use.

[0022] (2) The inner lining structure of the present disclosure adopts a three-layer stacked design consisting of a skin-contact layer, a control layer, and a protective layer. The edge of each layer is inset to form a stepped variation, ultimately conforming and connecting with the front panel to create a continuous stepped edge sealing structure. This not only enhances support at the crotch area but also ensures a more natural and smooth transition at the edge of the underparts body, eliminating the abrupt sensation often found in traditional underpants, further improving wearing comfort and aesthetic appeal.BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a rear view of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0024] FIG. 2 is a front view of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0025] FIG. 3 is a structural unfolding diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0026] FIG. 4 is another structural unfolding diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0027] FIG. 5 is a structural disassembly diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 1;

[0028] FIG. 6 is a cross-sectional view of the crotch gusset structure in Example 1;

[0029] FIG. 7 is a structural diagram of the crotch gusset structure in Example 1;

[0030] FIG. 8 is a structural disassembly diagram of invisible underpants with an anti-embarrassment crotch structure according to Example 2;

[0031] FIG. 9 is a cross-sectional view of the crotch gusset structure in Embodiment 2.Description of reference signs:

[0032] 1, Front Panel; 11, Crotch; 2, Back Panel; 3, Inner Lining Structure; 31, Skin-Contact Layer; 311, Upper Edge Line; 312, Lower Edge Line; 32, Padding Layer; 33, Control Layer; 34, Protective Layer; 4, Crotch Gusset Structure; 5, Stepped Edge Sealing Structure; 51, First Step; 52, Second Step; 53, Third Step; 6, First Connecting Part; 7, Second Connecting Part; 8, Waistband.DESCRIPTION OF EMBODIMENTS

[0033] Below, with reference to the drawings in the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure will be described clearly and completely. It is obvious that the described embodiments are only part of the present disclosure, not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary skilled persons in the field without creative work fall within the scope protected by the present disclosure.

[0034] In the description of the present disclosure, it shall be appreciated that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicating direction or positional relationships are based on the directions or positional relationships shown in the drawings, merely for facilitating the description of the present disclosure and simplifying descriptions, and not intended to indicate or imply that the specified device or component must have specific orientations, constructions, or operations, thus they should not be construed as limiting the present disclosure.Embodiment 1

[0035] As shown in FIGS. 1-7, this embodiment provides a pair of invisible underpants with an anti-embarrassment crotch structure, including an underparts body; the underparts body includes a front panel 1 and a back panel 2 connected together, the front panel 1 having a crotch 11 covering the user’s private area, the crotch 11 includes an inner lining structure 3 located on the inner side of the front panel 1, and the inner lining structure 3 is configured to support the crotch 11 to prevent embarrassing lines from showing through.

[0036] The inner lining structure 3 includes a skin-contact layer 31, a control layer 33, and a protective layer 34; the skin-contact layer 31, the control layer 33, the protective layer 34, and the front panel 1 are stacked in sequence to form a crotch gusset structure 4 with an edge thickness varying stepwise.

[0037] The control layer 33 is stacked on a side of the protective layer 34 facing the body, with an area smaller than that of the protective layer 34, and its four edges are inset to form a first step 51; the protective layer 34 has an area smaller than the skin-contact layer 31, and its four edges are inset to form a second step 52; the skin-contact layer 31 is stacked on a side of the control layer 33 facing the body, with an area smaller than the front panel 1, and its four edges are inset to form a third step 53.

[0038] An edge of the skin-contact layer 31 is respectively bonded to edges of the protective layer 34 and the front panel 1, forming a continuous stepped edge sealing structure 5.

[0039] First, this embodiment provides a crotch 11 covering the user’s private area on the front panel 1, which also features a unique inner lining structure 3, effectively preventing potential embarrassing lines at the crotch 11. This design fully considers users’ privacy needs during wear, ensuring the crotch 11 remains flat and invisible under any activity state, greatly enhancing confidence and comfort during wearing.

[0040] Moreover, the inner lining structure 3 of this embodiment adopts a three-layer stacked design of the skin-contact layer 31, control layer 33, and protective layer 34, with each layer’s edge being inset to form a stepped variation, ultimately bonded to the front panel 1 to create a continuous stepped edge sealing structure 5. This not only enhances support at the crotch 11 but also ensures a more natural and smooth transition at the edge of the underparts body, eliminating the abrupt sensation often found in traditional underwear edges, further improving comfort and appearance.

[0041] Additionally, the crotch gusset structure 4, through a multi-layer stacked design, has a thickness significantly less than that of sponge in existing technologies. While maintaining anti-embarrassment performance, it also fully considers breathability and moisture absorption of invisible underpants, helping keep the private area dry and comfortable, reducing bacterial growth, thus contributing to personal hygiene and health.

[0042] Specifically, one side of the control layer 33 is fully bonded to the protective layer 34; the control layer 33 includes non-stretch mesh fabric or is made from non-stretch mesh fabric.

[0043] The placement of the control layer 33 achieves both force control and ensures the anti-embarrassment structure remains untwisted and flat during wear and movement, effectively preventing embarrassing situations.

[0044] Specifically, the thickness range of the control layer 33 is 1.0mm-2.0mm, maintaining the thinness of the crotch gusset structure 4.

[0045] Specifically, a spacing between the first step 51 and the second step 52 is smaller than a spacing of the second step 53; the edge thickness of the crotch gusset structure 4 decreases stepwise from inside to outside.

[0046] The design of the step spacing creates a reasonable transition zone between the skin-contact layer 31, the control layer 33, and the protective layer 34. The smaller spacing between the first step 51 and the second step 52 helps reduce friction between layers, minimizing foreign-body sensation during wear and thereby enhancing comfort. Meanwhile, the stepwise reduction in edge thickness from inside to outside makes the underpants’ edge smoother, reducing skin pressure during wear and further improving comfort.

[0047] Specifically, the bottom of the front panel 1 is connected to the bottom of the back panel 2, forming the first connecting part 6; when the underparts body is laid flat, the first connecting part 6 is located on the rear side of the underparts body; the bottom of the skin-contact layer 31 extends away from the back panel 2 until overlapping with the first connecting part 6.

[0048] The posterior placement of the first connecting part 6 helps avoid friction against the body’s intimate areas, enhancing comfort.

[0049] Specifically, the skin-contact layer 31 includes the upper edge line 311 and the lower edge line 312; the upper edge line 311 extends toward the waistband 8, while the lower edge line 312 extends toward the first connecting part 6; the left and right sides of the inner lining structure 3 gradually narrow from the upper edge line 311 to the lower edge line 312.

[0050] Specifically, both the upper edge line 311 and the lower edge line 312 have arc-shaped, wavy, or straight shapes; this embodiment does not limit the shape of the upper edge line 311 and the lower edge line 312, which may also be any common shape beyond the above.

[0051] More specifically, the shapes of the skin-contact layer 31, the control layer 33, and the protective layer 34 are all trapezoidal, inverted triangular, or fan-shaped; this embodiment does not limit the shapes of the skin-contact layer 31, the control layer 33, and the protective layer 34, which may also be any common shape beyond the above.

[0052] Specifically, the two sides of the front panel 1 are respectively connected to the corresponding sides of the back panel 2 through conforming fit and / or stitching, forming the second connecting part 7; when the underparts body is laid flat, the second connecting part 7 is located on the front side of the underparts body.

[0053] It should be noted that, besides conforming fit and stitching, other common connection methods also provide equivalent technical effects.

[0054] In this embodiment, by connecting the two sides of the front panel 1 to the two sides of the back panel 2 to form the second connecting part 7, and positioning it on the front side of the underparts body when laid flat, a forward shift is achieved compared to the traditional side bone position. This design significantly enhances the support force of the front panel 1 on both sides, effectively strengthening the overall fixation of the underpants. When the underpants are worn, even during vigorous activities, the central portion of the front panel 1 is unlikely to slide down, thus maintaining the stability and comfort of the invisible underpants.Embodiment 2

[0055] As shown in FIGS. 8-9, this embodiment further provides another type of invisible underpants with an anti-embarrassment crotch structure. Features not explained in this embodiment may refer to those in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 lies in the following.

[0056] The inner lining structure 3 further includes a padding layer 32 arranged between the skin-contact layer 31 and the control layer 33. One surface of the padding layer 32 is fully bonded to the control layer 33, while the other surface is not bonded to the skin-contact layer 31. The padding layer 32 is used to elevate the central portion of the crotch 11, further filling the concave area of the user’s private region, visually presenting a smooth outer surface and further preventing the appearance of embarrassing lines.

[0057] Specifically, a thickness of the central portion of the crotch gusset structure 4 is 3.0-18.0mm.

[0058] More specifically, without the padding layer 32, the thickness of the central portion of the crotch gusset structure 4 is thickness of the central portion of; when the padding layer 32 is present, the thickness of the central portion of the crotch gusset structure 4 is 8.0-12.0mm. This thickness range ensures sufficient support for the invisible underpants while avoiding discomfort caused by excessive thickness.

[0059] An edge transition thickness of the crotch gusset structure 4 is 0.1–8.0 mm, which makes the edge of the crotch gusset structure 4 smoother; meanwhile, the smooth transition also helps improve the conforming fit between the invisible underpants and the body, reducing shifting during movement.

[0060] Specifically, the shape and area size of the padding layer 32 are identical to those of the control layer 33.

[0061] Specifically, both the padding layer 32 and the protective layer 34 are made of a sandwich-structure material, with a thickness range of 1.0 mm to 5.0 mm. In this embodiment, 1.0 mm is preferentially selected to maintain the thinness of the inner lining structure 3, further preventing noticeable contours from forming in the crotch 11 during wear, achieving the effect of invisible, mark-free underpants.

[0062] The sandwich-structure material exhibits excellent breathability and elasticity, wherein the elasticity of the sandwich-structure material is greater than that of the non-stretch mesh fabric.

[0063] In this embodiment, the sandwich-structure material is a fabric name, scientifically known as high-molecular synthetic fiber yarn, specifically described as follows.

[0064] The primary raw material of the sandwich-structure material is high-molecular synthetic fiber yarn, which is refined from petroleum. The sandwich-structure material is typically woven by a warp-knitting machine, consisting of three layers: top, middle, and bottom. The surface usually features a mesh design, the middle layer is MOLO yarn connecting the surface and base, and the bottom is a tightly woven plain surface.

[0065] The three-dimensional mesh structure of the sandwich-structure material provides good breathability and moderate adjustability, earning it the nickname "breathable mesh fabric." This three-dimensional mesh structure promotes smooth airflow and ensures surface dryness and comfort. Meanwhile, when subjected to external force, the three-dimensional mesh structure can extend and return to its original shape after the force is removed, offering excellent cushioning protection. Moreover, the lightweight nature of the three-dimensional mesh structure allows it to withstand hand washing, machine washing, and dry cleaning, making it easy to clean and quick to air-dry.

[0066] The sandwich-structure material has undergone anti-mold and antibacterial treatment, effectively inhibiting bacterial growth and maintaining hygiene.

[0067] The sandwich-structure material is also produced using a knitted warp-knitting method, making it strong and durable, capable of withstanding high tensile and tearing forces.

[0068] In Embodiment 2, it should be noted that some users have the habit of removing pubic hair, which makes the depression in the intimate area more pronounced; thus, adding a padding layer 32 further fills the depressed area. Users without the habit of removing pubic hair only need the invisible underpants in Embodiment 1; if such users adopt the invisible underpants in Embodiment 2, although the padding layer 32 can fill the depression, its outer surface may appear protruding. Additionally, slight variations exist in the depression areas among individuals; users may select the appropriate invisible underpants with an anti-embarrassment crotch structure based on their personal needs.

[0069] Based on the disclosure and teachings provided above, those skilled in the art within the field of this disclosure may make alterations and modifications to the aforementioned embodiments. Therefore, this disclosure is not limited to the specific embodiments disclosed and described above, and any modifications or changes to this disclosure should fall within the scope of protection defined by the claims. Furthermore, although certain specific terms are used in this description, they are merely for convenience in explanation and do not impose any limitations on this disclosure.

Examples

embodiment 1

[0035]As shown in FIGS. 1-7, this embodiment provides a pair of invisible underpants with an anti-embarrassment crotch structure, including an underparts body; the underparts body includes a front panel 1 and a back panel 2 connected together, the front panel 1 having a crotch 11 covering the user’s private area, the crotch 11 includes an inner lining structure 3 located on the inner side of the front panel 1, and the inner lining structure 3 is configured to support the crotch 11 to prevent embarrassing lines from showing through.

[0036]The inner lining structure 3 includes a skin-contact layer 31, a control layer 33, and a protective layer 34; the skin-contact layer 31, the control layer 33, the protective layer 34, and the front panel 1 are stacked in sequence to form a crotch gusset structure 4 with an edge thickness varying stepwise.

[0037]The control layer 33 is stacked on a side of the protective layer 34 facing the body, with an area smaller than that of the protective layer 3...

embodiment 2

[0055]As shown in FIGS. 8-9, this embodiment further provides another type of invisible underpants with an anti-embarrassment crotch structure. Features not explained in this embodiment may refer to those in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 lies in the following.

[0056]The inner lining structure 3 further includes a padding layer 32 arranged between the skin-contact layer 31 and the control layer 33. One surface of the padding layer 32 is fully bonded to the control layer 33, while the other surface is not bonded to the skin-contact layer 31. The padding layer 32 is used to elevate the central portion of the crotch 11, further filling the concave area of the user’s private region, visually presenting a smooth outer surface and further preventing the appearance of embarrassing lines.

[0057]Specifically, a thickness of the central portion of the crotch gusset structure 4 is 3.0-18.0mm.

[0058]More specifically, without th...

Claims

1. A pair of invisible underpants with an anti-embarrassment crotch structure, comprising an underparts body, the underparts body comprising a front panel and a back panel connected together, wherein:the front panel has a crotch covering private area of a user, the crotch comprising an inner lining structure located on an inner side of the front panel; the inner lining structure comprises a skin-contact layer, a control layer, and a protective layer; the skin-contact layer, the control layer, and the protective layer are stacked sequentially on the front panel, forming a crotch gusset structure with an edge thickness varying stepwise;wherein the control layer is stacked on a side of the protective layer facing the body and has an area smaller than that of the protective layer, and four edges thereof are inset to form a first step; the protective layer has an area smaller than that of the skin-contact layer, and four edges thereof are inset to form a second step; the skin-contact layer is stacked on a side of the control layer facing the body and has an area smaller than that of the front panel, and four edges thereof are inset to form a third step;an edge of the skin-contact layer is respectively bonded to an edge of the protective layer and the front panel, forming a continuous stepped edge sealing structure;the control layer comprises non-stretch mesh fabric or is made from non-stretch mesh fabric; the control layer has a thickness in a range from 1.0mm to 2.0mm; andthe protective layer is made of a sandwich-structure material, with a thickness in range from 1.0mm to 5.0mm.

2. The invisible underpants with an anti-embarrassment crotch structure according to claim 1, wherein one side of the control layer is fully bonded to the protective layer.

3. The invisible underpants with an anti-embarrassment crotch structure according to claim 1, wherein a spacing between the first step and the second step is less than a spacing between the second step and the third step; the edge thickness of the crotch gusset structure decreases stepwise from inside outward.

4. The invisible underpants with an anti-embarrassment crotch structure according to claim 1, wherein a bottom of the front panel is connected to a bottom of the back panel, forming a first connecting part; when the underparts body is laid flat, the first connecting part is located at a rear side of the underparts body; a bottom of the skin-contact layer extends away from the back panel until overlapping with the first connecting part.

5. The invisible underpants with an anti-embarrassment crotch structure according to claim 4, wherein the skin-contact layer comprises an upper edge line and a lower edge line; the upper edge line extends toward a waistband, and the lower edge line extends toward the first connecting part; left and right sides of the inner lining structure are gradually narrow and transition from the upper edge line to the lower edge line.

6. The invisible underpants with an anti-embarrassment crotch structure according to claim 1, wherein two sides of the front panel are connected to corresponding sides of the back panel through conforming fit and / or stitching, forming a second connecting part; when the underparts body is laid flat, the second connecting part is located on a front side of the underparts body.

7. The invisible underpants with an anti-embarrassment crotch structure according to claim 1, wherein the inner lining structure further comprises a padding layer arranged between the skin-contact layer and the control layer, wherein one surface of the padding layer is fully bonded to the control layer, and the other surface is not bonded to the skin-contact layer.

8. The invisible underpants with an anti-embarrassment crotch structure according to claim 7, wherein the crotch gusset structure has a central thickness in a range from 3.0 to 18.0mm, and an edge transition thickness in a range from 0.1 to 8.0 mm.

9. The invisible underpants with an anti-embarrassment crotch structure according to claim 7, wherein a shape and an area size of the padding layer are identical to those of the control layer.

10. The invisible underpants with an anti-embarrassment crotch structure according to claim 9, wherein the padding layer is made of a sandwich-structure material, with a thickness in a range from 1.0mm to 5.0mm.

11. The invisible underpants with an anti-embarrassment crotch structure according to claim 1, wherein the crotch gusset structure has a central thickness in a range from 3.0 to 18.0mm, and an edge transition thickness in a range from 0.1 to 8.0 mm.

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