Highly breathable self-adapting fit back leakage prevention sanitary panty during menstruation and preparation method thereof

Abstract

The application provides a high-breathability self-adaptive fitting back leakage prevention sanitary panty during menstruation and a preparation method thereof, and belongs to the technical field of sanitary products. The sanitary panty comprises an absorbent main body, the length extension direction of the absorbent main body is defined as the front-back direction, a waist member, the waist member is laminated on the non-skin side of the absorbent main body, arch-shaped protruding structures are arranged at both ends of the absorbent main body, the front end of the arch-shaped protruding structure corresponds to the abdomen organ without glue area of the waist member, and the inner cavity of the arch-shaped protruding structure forms a hollow air channel. The sanitary panty is provided with a warp-weft direction coordinated exhaust passage structure, a layered design of thick denier spandex filaments and thin denier spandex filaments, and an anchoring and stretching dynamic fitting structure design, so that the breathability and comfort of the sanitary panty are improved, the production can be debugged on the original production line, and the cost is not excessively high, thereby avoiding the difficulty in mass production.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, specifically to a highly breathable, self-adaptive, leak-proof menstrual sanitary panty and its preparation method. Background Technology

[0002] As a core menstrual care product, feminine sanitary panties are widely used by women for daily life and nighttime sleep due to their ease of wear and strong leak-proof properties. With rising consumer expectations, users are demanding higher levels of comfort, breathability, fit, and leak-proof stability from sanitary panties. Currently, the mainstream feminine sanitary panty designs on the market still have many inherent flaws, making it difficult to simultaneously meet the multiple needs of breathability, comfort, fit, and leak prevention. Specific technical issues are as follows: First, current sanitary panties on the market have a simplistic design for breathability, resulting in poor overall breathability and heat dissipation. Consumers experience significant discomfort and discomfort from the stuffiness and dampness experienced during menstruation. Existing products rely solely on the micropores in the bottom membrane for passive ventilation, failing to create active airflow channels for convection. Furthermore, the absorbent lining and the layers of the bottom / upper layer, as well as the bottom and bottom / upper layers, are all bonded using hot-melt adhesive. This hot-melt adhesive compacts and seals the gaps between fabric fibers, creating a closed cavity inside the panty. When worn, the heat and moisture generated by body movement and pressure cannot be quickly dissipated. This accumulation of heat and moisture in the genital area not only causes noticeable stickiness and discomfort but also easily leads to bacterial growth, causing skin problems such as stuffiness, redness, and itching. Relying solely on the passive ventilation mode of the bottom membrane micropores cannot fundamentally solve the core problem of heat and moisture buildup inside the panty.

[0003] Utility model patent application number 202321588475.8 discloses a trouser-type absorbent article that improves breathability and reduces clothing friction. This solution creates a breathable channel extending along the length between two adjacent first pleats. The multiple first pleats are relatively high, large in volume, have internal cavity structures, and are arranged in a consistent manner. This ensures that when the multiple first pleats are in contact with the wearer's skin, multiple breathable channels extending along the length are formed between any two adjacent rows of consistent first pleats, reducing stuffiness during wear. However, the breathable channel formed by the pleats has certain problems; it lacks effective support, especially when worn. The elastic band (spandex yarn) is stretched, the pleats tend to flatten, and the breathability is significantly reduced.

[0004] Secondly, the traditional elastic waistband design is flawed, easily causing marks, stinging, and poor fit. Most existing sanitary panty waistbands use a single-gauge spandex yarn and a full-width adhesive composite structure, resulting in a stiff and uniform elastic distribution. On one hand, the overall elastic pressure is concentrated, causing continuous pressure on the waist and abdomen skin with prolonged wear. Given women's physiological characteristics of bloating and sensitivity during menstruation, this easily leads to red marks, marks, and stinging, resulting in a poor wearing experience. On the other hand, the waistband lacks dedicated ventilation gaps; the elastic layer and non-woven fabric are completely bonded without gaps, creating a sealed and non-breathable area that further exacerbates the problem of stuffiness in the waist and abdomen, failing to achieve two-way ventilation and heat dissipation.

[0005] Third, most current commercially available sanitary panties use a single, all-over-adhesive composite elastic band for the waist and abdomen, with no differentiation in elasticity ratios across the entire area. The elastic band's rebound requires overcoming the combined resistance of the adhesive and the double-layered non-woven fabric, resulting in poor rebound performance and a lack of segmented, differentiated deformation design. Without fixed anchor points during wear, the initial positioning of the panties is unstable, easily shifting or slipping, requiring repeated adjustments, making wearing cumbersome and laborious. Furthermore, the physiological differences in the circumference of the inner and outer thighs mean that a uniform elasticity ratio structure cannot adapt to these variations, easily leading to localized tightness, wrinkles, and poor fit. During activity, the shifting fabric continuously rubs against the skin, causing a rough and uncomfortable feel. In addition, a uniform elastic structure across the entire width makes it difficult to balance ease of wear with dynamic fit performance. High-elasticity panties have high resistance and require effort to pull up, while low-elasticity panties have poor fit and are prone to leakage, resulting in a significant shortcoming in adaptability.

[0006] Fourth, existing menstrual panty products typically feature elastic bands in the crotch area, which contract to conform to the curves of the human crotch. To ensure a uniform fit across all areas of the crotch, traditional designs generally apply the same elastic band ratio across the entire crotch area, aiming for a balanced contraction. However, the physiological curves of the human crotch, especially the gluteal fold area, exhibit significant asymmetry and abrupt changes—the perineum is relatively flat, while the gluteal fold area shows a noticeable depression and curvature. This results in the following technical defects: First, because it cannot effectively conform to the abrupt physiological curve of the gluteal fold, gaps exist between this area and the skin, making it easy for menstrual blood to leak back along the groin drainage channel. Second, the gaps created by poor fit in the gluteal fold area also become trapping spaces for hot and humid air. Combined with the numerous skin folds and poor ventilation in this area, hot and humid air easily accumulates, affecting wearing comfort and potentially causing skin discomfort. Summary of the Invention

[0007] This invention provides a highly breathable, self-adaptive, leak-proof menstrual sanitary panty and its preparation method to solve the technical problems in the prior art.

[0008] To solve the above problems, the high-breathability, self-adaptive fit, and leak-proof menstrual sanitary pants provided by the present invention adopt the following technical solution: including an absorbent body, wherein the length extension direction of the absorbent body is defined as the front-back direction; The waist structure is layered on the non-skin side of the absorbent body and includes a sub-layer and a bottom layer. The absorbent body has arched protrusions at both the front and rear ends. The front end of the arched protrusions corresponds to the accordion-free area of ​​the waistband. The inner cavity of the arched protrusions forms a hollow air channel, so that when the body moves and squeezes the pants, the hot and humid air of the absorbent body can be discharged to the side accordion-free area of ​​the abdomen along the hollow air channel formed by the inner cavity of the arched protrusions. The waistband component has 5 elastic bands coated with elastic in the hip area, while the rest of the hip area is without adhesive. The elastic bands shrink to form a natural concave-convex hollow structure, which constitutes a transverse air channel. When the pants are compressed, the internal hot and humid air is discharged to both sides along the transverse air channel. The waist elastic area of ​​the waist component is provided with coarse denier spandex yarn and fine denier spandex yarn. The coarse denier spandex yarn is located on the skin side of the waist component, and the fine denier spandex yarn is located on the non-skin side of the waist component. The coarse denier spandex yarn and the fine denier spandex yarn are distributed alternately. The waist elastic region of the waist component is divided into three zones: A, B, and C. Zone A corresponds to the outer thigh when worn, Zone C corresponds to the inner thigh when worn, and Zone B is located at the transition position between Zone A and Zone C. The tensile deformation rate of Zones A, B, and C is set as A > C > B.

[0009] As a further improvement, the width of the arched protrusion structure is the same as the width of the absorbent body, and the length of the arched protrusion structure is 0-30mm.

[0010] As a further improvement, the composite area of ​​the waist component and the absorbent body is provided with an ultrasonic welding zone, which is used to achieve point breakage of the elastic band and prevent the waist component from delaminating or lifting.

[0011] As a further improvement, the coarse denier spandex yarn is fully glued together, and the entire coarse denier spandex yarn is completely bonded to the skin side of the waist component with hot melt adhesive, without any separation gaps from the inner non-woven fabric of the waist component; the two ends of the fine denier spandex yarn are fixed with hot melt adhesive at the left and right sides of the waist and at the overlap position between the fine denier spandex yarn and the absorbent body, while other areas of the fine denier spandex yarn are glue-free sections, and gaps are maintained between the fine denier spandex yarn and the outer and inner non-woven fabrics.

[0012] As a further improvement, the absorbent core of the absorbent body is provided with a central convex structure, which is located on the front side of the absorbent core at a position corresponding to the female perineum.

[0013] As a further improvement, the length of the convex structure is 80-200mm, and the ratio of the unit area weight of the convex structure to the unit area weight of other areas of the surrounding absorber core is between 1 and 2.

[0014] As a further improvement, the absorbent core of the absorbent body is provided with a G-fold absorbent paper structure, which is located on the front side of the absorbent core at a position corresponding to the female perineum, and the length of the G-fold absorbent paper structure is 80-200mm.

[0015] As a further improvement, the G-fold absorbent paper structure has several puncture points evenly distributed in a triangular arrangement.

[0016] As a further improvement, the maximum scaling factor of area A is 2.5-3.5 times, the maximum scaling factor of area B is 1.2-1.8 times, and the maximum scaling factor of area C is 2-3 times.

[0017] This invention also provides a method for preparing a highly breathable, self-adaptive, leak-proof menstrual sanitary panty, which includes the following steps: S1. The arched protrusion structure is formed. The absorbent body is cut by the cutting equipment and then combined with the waist component. The effective adsorption length of the suction cup at the cutting station is less than the total length of the absorbent body. During the suction operation, there are 0-30mm negative pressure adsorption areas on the front and rear edges of the absorbent body. From bottom to top, the workstations in contact with the suction cups consist of the top layer, the guide layer, the absorbent core, and the bottom film. The outer bottom film allows the suction cups to remove air from the middle interlayer, causing the multiple layers of fabric in the middle to be compressed and shortened by negative pressure. Air is retained in the interlayers at the front and rear edges of the absorbent core, and the fabric remains relaxed and stretched, naturally stacking to form wave-like pleats. When the core is combined with the waist component after being turned and cut, it is simultaneously compacted and shaped, so that the front and rear edges of the absorbent core permanently form an arched protrusion structure. S2. Installation of coarse and fine denier spandex yarns; the coarse denier spandex yarns are fully glued together and evenly distributed on the inner side of the sub-bottom layer. The coarse denier spandex yarns are sprayed with hot melt adhesive, and the coarse denier spandex yarns are completely bonded to the sub-bottom layer without gaps, forming an inner load-bearing support layer; the fine denier spandex yarns are arranged in parallel and staggered with the coarse denier spandex yarns. Hot melt adhesive is sprayed at fixed points on the left and right sides of the waistband and at the overlap position with the absorbent main body to fix the two ends of the fine denier spandex yarns. The adhesive spraying is closed throughout the middle section of the waistband. A through gap is reserved between the middle section of the fine denier spandex yarns and the sub-bottom layer and the bottom layer; the pleat gaps are connected with the suspended gaps of the fine denier spandex yarns to form multiple breathable air channels extending laterally along the waistband; In the forming and welding-cutting process of areas S3.A, B, and C, areas A and C are fixed by pins, and area B is fixed by negative pressure adsorption. After welding and cutting, the pins retract downwards. Since there are no suction holes at the pins, the spandex yarn naturally shrinks after cutting. When the pins in areas A and C retract downwards, the overall shrinkage and fixation are greater than that in area B. Area B is inhibited by the negative pressure adsorption, resulting in insufficient shrinkage and fewer pleats than areas A and B. This makes the tensile deformation rate of areas A and C greater than that of area B.

[0018] The beneficial effects of the above-described technical solution of the present invention are as follows: 1. This invention improves the breathability of sanitary pants by setting a warp and weft synergistic exhaust channel structure. The front and rear ends of the absorbent body are formed into curved arched protrusion structures through corresponding processes. The interior of the arched protrusion structure is fluffy, and the arched protrusion structure corresponds to the abdominal accordion non-adhesive area of ​​the waist component. When the human body moves and squeezes the pants, the hot and humid air inside can be discharged along the arched protrusion structure to the side non-adhesive area, realizing longitudinal breathability and exhaust. The waistband has only 5 elastic bands with adhesive applied to the hip area, while the rest of the hip area is without adhesive. The elastic bands contract to form a natural concave-convex hollow structure, creating a horizontally permeable air channel. When the pants are compressed, the internal humid and hot air is discharged to both sides along the horizontal air channel. The warp and weft coordinated exhaust channel structure design effectively improves the breathability of the sanitary pants.

[0019] 2. The waistband features a layered design. The inner layer of coarse denier spandex is fully glued in place. The inner and outer layers of fine denier spandex are interwoven and work together, resulting in even stress distribution and a more natural fit to the body's curves. Under the same tensile force, the skin experiences less stress, preventing redness and stinging even after overnight wear, making it suitable for sensitive waistlines and bloating during menstruation. The outer layer of fine denier spandex is glue-free and suspended. When the waistband stretches and contracts, the outer non-woven fabric bends back and forth with the fine denier spandex, creating continuous accordion-like pleats. The gaps between the fine denier spandex and the sub-bottom and bottom layers are longitudinally connected, forming multiple air circulation channels extending laterally along the waistband. These air channels connect the inside and outside of the waistband, achieving two-way breathability.

[0020] 3. Based on human anatomy, this invention divides the elastic area of ​​the waistband component into zones A, B, and C laterally, with the stretch deformation rate of zones A, B, and C set as A > C > B. This precisely adapts to the differences in leg circumference and waist / abdomen shape among women, avoiding the problems of traditional overnight pants being too tight, constricting the abdomen, wrinkled, bulging, and not fitting properly. Furthermore, the lifting process involves even force distribution and less resistance, making wearing easier and resulting in a better overall fit. This effectively prevents the pants from shifting or slipping, eliminating the need for repeated adjustments and significantly reducing the difficulty of wearing. Compared to women's sanitary panties with a uniformly stretchable structure, the wearing efficiency is significantly improved.

[0021] 4. In this invention, the ratio of the unit area weight of the convex structure to the unit area weight of other areas of the surrounding absorbent core is between 1 and 2. Under the same elastic band ratio, the convex area has a higher weight and fiber density, resulting in greater stiffness. Therefore, the compression of this area by the elastic band is limited, maintaining a relatively flat surface. Meanwhile, the area corresponding to the buttock crease at the rear end has a lower weight and lower stiffness, resulting in a greater contraction under the same elastic band retraction force, thereby achieving a close fit to the rear buttock crease curve. Attached Figure Description

[0022] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is a side view of the high-breathability, self-adaptive fit, and leak-proof menstrual sanitary panty of the present invention. Figure 2 This is a schematic diagram of the arched protrusion structure of the high-breathability, self-adaptive fit, and leak-proof menstrual sanitary pants of the present invention. Figure 3 This is a reference diagram of the arched protrusion structure of the high-breathability adaptive fit anti-leakage menstrual sanitary pants of the present invention; Figure 4 This is a schematic diagram of the ultrasonic welding area of ​​the high-breathability, self-adaptive, fit-fitting, leak-proof menstrual sanitary pants of the present invention; Figure 5 This is a schematic diagram of the adhesive distribution in the buttock area of ​​the high-breathability adaptive fit anti-leakage menstrual sanitary panty of the present invention; Figure 6 This is a schematic diagram of the non-skin side of the waistband portion of the high-breathability, self-adaptive fit, leak-proof menstrual sanitary panty of the present invention. Figure 7 This is a schematic diagram of the skin side structure of the waistband portion of the high-breathability, self-adaptive fit, and leak-proof menstrual sanitary pants of the present invention; Figure 8 This is a cross-sectional view of the female thigh of the high-breathability, self-adaptive fit, leak-proof menstrual sanitary pants of the present invention; Figure 9 This is a schematic diagram of the differentiated stretching area of ​​the high-breathability adaptive fit anti-leakage menstrual sanitary pants of the present invention; Figure 10 This is a schematic diagram showing the structure of the leg positions corresponding to zones A, B, and C after wearing the high-breathability, self-adaptive fit, and leak-proof menstrual sanitary pants of the present invention. Figure 11 This is a schematic diagram of the integrated welding and cutting device for the high-breathability, self-adaptive, fit-fitting, leak-proof menstrual sanitary pants of the present invention; Figure 12 This is a schematic diagram of the mold structure of the release roller forming cavity mold for the high-breathability, self-adaptive fit, and leak-proof menstrual sanitary pants of the present invention; Figure 13 This is a schematic diagram of the convex structure of the high-breathability, self-adaptive fit, and leak-proof menstrual sanitary pants of the present invention; Figure 14 This is a reference diagram of the convex structure of the high-breathability, self-adaptive fit, leak-proof menstrual sanitary pants of the present invention; Figure 15This is a schematic diagram of the G-fold absorbent paper structure of the high-breathability, self-adaptive, fit-fitting, leak-proof menstrual sanitary pants of the present invention; Figure 16 This is a reference diagram of the G-fold absorbent paper structure of the high-breathability, self-adaptive, fit-fitting, leak-proof menstrual sanitary panty of the present invention; Figure 17 This is a cross-sectional view of the G-fold absorbent paper structure of the high-breathability, self-adaptive, leak-proof menstrual sanitary panty of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Absorbent core; 11. Top layer; 12. Flow guiding layer; 13. Core coating layer; 14. Absorbent core; 141. Convex structure; 142. G-fold absorbent paper structure; 15. Bottom film; 16. Arched protrusion structure; 2. Waist component; 21. Subbottom layer; 22. Bottom layer; 23. Fine denier spandex filament; 24. Coarse denier spandex filament; 3. Demolding wheel forming cavity mold; 31. Forming groove; 32. Concave cavity. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] In the current technology, the structural design of mainstream women's sanitary pants on the market still has many inherent defects, making it difficult to meet the multiple usage needs of breathability, comfort, fit and leak prevention.

[0026] To address the aforementioned problems, the present invention has made the following improvements: First, a warp and weft synergistic exhaust channel structure is adopted to improve the breathability of the sanitary pants. The front and rear ends of the absorbent body 1 are formed into curved arched protrusion structures 16 through corresponding processes. The interior of the arched protrusion structure 16 is fluffy, and the arched protrusion structure 16 corresponds to the abdominal accordion-like glue-free area of ​​the waist component 2. When the human body moves and squeezes the pants, the hot and humid air inside can be discharged along the arched protrusion structure 16 to the side glue-free area, realizing longitudinal breathability and exhaust. The waistband component 2 has only 5 elastic bands in the hip area coated with elastic adhesive, while the rest of the hip area is without adhesive. The elastic bands contract to form a natural concave-convex hollow structure, creating a horizontally permeable air channel. When the pants are compressed, the internal hot and humid air is discharged to both sides along the horizontal air channel. The warp and weft coordinated exhaust channel structure design effectively improves the breathability of the sanitary pants.

[0027] Secondly, the layered design using spandex fibers reduces discomfort and marks. The inner layer of coarse denier spandex fibers 24 is fully glued in place, and the inner layer of coarse denier spandex fibers 24 and the outer layer of fine denier spandex fibers 23 are interspersed and work together, resulting in even stress distribution and a better fit to the body's curves when worn. Under the same tensile force, the skin experiences less stress, preventing red marks and stinging even after wearing all night, making it suitable for sensitive waist and abdomen during menstruation. The outer layer of fine denier spandex fibers 23 is glue-free and suspended. When the waistband stretches and contracts, the outer non-woven fabric bends back and forth with the fine denier spandex fibers 23, forming continuous accordion wave pleats. The gaps between the fine denier spandex fibers 23 and the sub-bottom layer 21 and bottom layer 22 are longitudinally connected, forming multiple air circulation channels extending laterally along the waistband. These air channels connect the inside and outside of the waistband, achieving two-way breathability.

[0028] Furthermore, based on the human body structure, the elastic area of ​​the waist circumference of the waist component 2 is divided into area A, area B and area C in the horizontal direction, and the tensile deformation rate of area A, area B and area C is set to area A > area C > area B.

[0029] When wearing the garment, the user first inserts their legs into the panty. The low-elasticity, low-stretch deformation B-zone can preferentially conform to the surface of the limbs, forming a stable wearing anchor point. When the panty is pulled upward, the A and C-zones on both sides, with their high elasticity ratio, adapt and stretch according to the user's leg circumference and waist and abdomen contours. This can accurately adapt to the differences in leg circumference and waist and abdomen shape among different women, avoiding the problems of traditional overnight panties being tight, constricting the abdomen, wrinkled, bulging, and not fitting properly. Moreover, the force is evenly distributed and the resistance is less during the lifting process, making it easier to wear. After wearing, the overall fit is higher, effectively preventing the panty from shifting or slipping. There is no need to repeatedly adjust the position of the panty, greatly reducing the difficulty of wearing. Compared with women's sanitary panties with a uniform elastic structure throughout, the wearing efficiency is significantly improved.

[0030] After being put on, during daily activities such as walking, turning over, and bending the knees, the anchoring B zone always stays close to the fixed points of the limbs, limiting the large-scale slippage of the pants and eliminating the itching, redness, and foreign body discomfort caused by repeated friction of the fabric against the sensitive skin on the inner thigh (the superficial area of ​​the saphenous nerve and gracilis muscle) after the shifting of traditional all-rubber products. The A zone adapts and extends with the large-scale flexion and extension of the outer thigh, without causing local strong pressure due to the pulling of activities. The C zone matches the narrow circumference of the inner thigh to maintain a gentle wrap, without the inner elastic band excessively tightening and compressing soft tissue, blood vessels, and nerves.

[0031] Finally, the ratio of the basis weight per unit area of ​​the central convex structure 141 to the basis weight per unit area of ​​other areas of the surrounding absorbent core 14 is between 1 and 2. Under the same elastic band ratio, the central convex area has a higher basis weight and higher fiber density, resulting in greater stiffness. Therefore, the compression of this area by the elastic band is limited, maintaining a relatively flat surface. Meanwhile, the area corresponding to the buttock crease at the rear end has a lower basis weight and lower stiffness, resulting in a greater contraction under the same elastic band retraction force, thereby achieving a close fit to the rear buttock crease curve.

[0032] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0033] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0034] Example 1 of the highly breathable, self-adaptive, leak-proof menstrual sanitary panties provided by this invention: like Figures 1-17 As shown, it includes an absorbent body 1 and a waist component 2. The length extension direction of the absorbent body 1 is defined as the front-to-back direction. The absorbent body 1 includes, from top to bottom, a surface layer 11, a flow guiding layer 12, an absorbent core 14, and a bottom membrane 15. The surface layer 11 and the flow guiding layer 12 are both hot air nonwoven fabrics. The bottom membrane 15 is an airtight bottom membrane. The absorbent core 14 includes wood pulp and superabsorbent polymer. To protect the wood pulp and superabsorbent polymer, the outer surface of the absorbent core 14 is also provided with a core covering layer 13. The core covering layer 13 is a spunbond nonwoven fabric. The waist component 2 is stacked on the non-skin side of the absorbent body 1. The waist component 2 includes a sub-bottom layer 21 (inner non-woven fabric), a bottom layer 22 (outer non-woven fabric), and an elastic band. The sub-bottom layer 21 is in contact with the bottom film 15. Both the sub-bottom layer 21 and the bottom layer 22 are spunbond non-woven fabrics, and the elastic band is spandex filament. like Figures 1-3 As shown, the absorbent body 1 has arched protrusions 16 at both the front and rear ends. The front end of the arched protrusions 16 corresponds to the non-adhesive area of ​​the abdominal accordion of the waist component 2 (i.e., the front side of the waist component 2, which corresponds to the abdomen when worn, and this area is a non-adhesive area). The inner cavity of the arched protrusions 16 forms a hollow air channel, so that when the body moves and compresses the pants, the hot and humid air of the absorbent body 1 can be discharged to the non-adhesive area of ​​the abdominal accordion along the hollow air channel formed by the inner cavity of the arched protrusions 16. The width of the arched protrusions 16 is the same as the width of the absorbent body 1, and the length of the arched protrusions 16 is 0-30mm.

[0035] like Figure 4 As shown, the composite area of ​​the waist component 2 and the absorbent body 1 is provided with an ultrasonic welding zone. The ultrasonic welding zone is used to achieve point breakage of the elastic band. Point breakage of the elastic band is to make the absorbent body 1 fit the human body better, reduce or avoid wrinkles in the absorbent body 1, and prevent the waist component 2 from delaminating or lifting.

[0036] The total length of the ultrasonic welding zone is less than the length of the absorbent body 1. The ultrasonic welding zone includes three areas: the front and rear sections and the middle section. The width of the ultrasonic welding zone in the front and rear sections is less than the width of the absorbent body 1, and the width of the ultrasonic welding zone in the middle section is less than the O-cut width.

[0037] like Figure 5 As shown, the hip area of ​​waist component 2 has 5 elastic bands coated with elastic adhesive, and the rest of the hip area is without adhesive. The elastic bands shrink to form a natural concave-convex hollow structure, which constitutes a horizontal air channel. When the pants are compressed, the internal hot and humid air is discharged to both sides along the horizontal air channel. like Figure 1 As shown, the elastic area of ​​the waistband of the waist component 2 is provided with coarse denier spandex yarn 24 and fine denier spandex yarn 23, wherein the coarse denier spandex yarn 24 is greater than or equal to 600 Dtex, and the fine denier spandex yarn 23 is 130-300 Dtex. The coarse denier spandex yarn 24 is located on the skin side of the waist component 2, and the fine denier spandex yarn 23 is located on the non-skin side of the waist component 2, and the coarse denier spandex yarn 24 and the fine denier spandex yarn 23 are distributed alternately. like Figure 6 and Figure 7 As shown, coarse denier spandex yarn 24 is fully bonded to the skin side of the waist component 2 using hot melt adhesive, with no separation gaps between it and the sub-bottom layer 21 of the waist component 2. Due to the full adhesive bonding of the coarse denier spandex yarn 24, from Figure 7 The coarse denier spandex filament 24 can be clearly seen in the image. The fine denier spandex filament 23 is fixed with hot melt adhesive at both ends on the left and right sides of the waistband and at the overlap between the fine denier spandex filament 23 and the absorbent main body 1. Other areas of the fine denier spandex filament 23 are unadhesive. A gap is maintained between the fine denier spandex filament 23 and the bottom layer 22 and the sub-bottom layer 21. Figure 6 It can be seen that the difference in fine denier spandex yarn 23 is relatively insignificant.

[0038] like Figures 8-10 As shown, by Figure 8 It can be seen that the circumferential dimensions of the human thigh cross-section are non-uniformly distributed: the circumference of the outer thigh is greater than that of the inner thigh, and there is a physiological difference between the two. In this embodiment, the waist elastic region of the waist component 2 is divided into three regions along the transverse direction: region A, region B, and region C. Region A corresponds to the outer thigh when worn, region C corresponds to the inner thigh when worn, and region B is located at the transition position between region A and region C. The tensile deformation rates of regions A, B, and C are set as region A > region C > region B. That is, region A provides the maximum elastic elongation to accommodate the larger outer circumference, region C provides the medium elongation to accommodate the smaller inner circumference, and region B provides the minimum elongation as a structural anchor point.

[0039] Accordion-style stretch pleats are evenly and densely arranged in areas A and C. The pleats are compact and numerous, with a maximum stretch ratio of 2.5-3.5 times in area A and 2-3 times in area C. In area B, the pleats are sparse and few in number, with a maximum stretch ratio of 1.2-1.8 times.

[0040] In this embodiment, the side seam weld is taken as the starting point of area A. The width of areas A, B and C in their natural shrinkage state is 15mm. After flattening, the length is measured, and the accordion shrinkage ratio is calculated by "stretched length ÷ 15". The maximum stretching ratio of area A is 2.5-3.5 times, the maximum stretching ratio of area B is 1.2-1.8 times, and the maximum stretching ratio of area C is 2-3 times.

[0041] like Figure 13 and Figure 14 As shown, the absorbent core 14 of the absorbent body 1 has a centrally convex structure 141, which is located on the front side of the absorbent core 14 corresponding to the female perineum. The length of the centrally convex structure 141 is 80-200mm, the lateral width is 40-80mm, and the front end of the centrally convex structure 141 is 30-60mm away from the front end of the absorbent core 14. The protrusion height of the centrally convex structure 141 is 2-6mm, and the ratio of the basis weight per unit area of ​​the centrally convex structure 141 to the basis weight per unit area of ​​the surrounding areas of the absorbent core 14 is between 1 and 2. That is, the basis weight of the centrally convex structure 141 is greater than that of the surrounding areas. Under the same elastic band ratio, the convex structure, with its 141-gram weight and high fiber density, has greater stiffness. Therefore, the compression of this area by the elastic band is limited, maintaining a relatively flat surface. In contrast, the area corresponding to the buttock crease at the rear end, with its smaller weight and lower stiffness, experiences greater contraction under the same elastic band retraction force, thus achieving a close fit to the rear buttock crease curve.

[0042] This embodiment also provides a method for preparing highly breathable, self-adaptive, leak-proof menstrual sanitary panties, which includes the following steps: S1. The arched protrusion structure 16 is formed. The absorbent body 1 is cut by the cutting equipment and then combined with the waist component 2. The effective adsorption length of the suction cup at the cutting station is less than the total length of the absorbent body 1. During the suction operation, there are 0-30mm negative pressure adsorption areas on the front and rear edges of the absorbent body 1. The layers in contact with the suction cup from bottom to top are: surface layer 11, guide layer 12, absorbent core 14, and bottom film 15. The outer bottom film 15 draws air out of the middle interlayer from the suction cup, causing the multiple layers of fabric in the middle to be compressed and shortened by negative pressure. Air is retained in the interlayer between the front and rear edges of the absorbent body 1, and the fabric remains relaxed and stretched, naturally stacking to form wave pleats. After being cut and combined with the bottom layer 22 and the bottom layer 21, it is simultaneously compacted and shaped, so that the front and rear edges of the absorbent body 1 permanently form an arched protrusion structure 16. S2. Coarse denier spandex yarn 24 and fine denier spandex yarn 23 are installed; the coarse denier spandex yarn 24 is fully glued and evenly distributed on the inner side of the sub-bottom layer 21 (inner non-woven fabric). The coarse denier spandex yarn 24 is sprayed with hot melt adhesive, and the coarse denier spandex yarn 24 and the sub-bottom layer 21 are completely bonded without gaps, forming an inner load-bearing support layer; the fine denier spandex yarn 23 is arranged in parallel and staggered with the coarse denier spandex yarn 24. The fine denier spandex yarn 23 is fixed by hot melt adhesive spraying at fixed points on the left and right sides of the waist and at the overlap position with the absorbent main body 1. The adhesive spraying is closed in the middle section of the waist. A through gap is reserved between the middle section of the fine denier spandex and the sub-bottom layer 21 (inner non-woven fabric) and the bottom layer 22 (outer non-woven fabric); the pleat gap is connected with the suspension gap of the fine denier spandex yarn 23, forming multiple breathable air channels extending laterally along the waist; The forming of areas S3.A, B, and C, such as Figure 11 As shown in the diagram (the red box indicates the needle row position), in the integrated welding and cutting process, areas A and C are fixed by the needle row, and area B is fixed by negative pressure adsorption. After the integrated welding and cutting, the needle row retracts downward. Since there are no suction holes at the needle row, the spandex yarn naturally shrinks after cutting. When the needle row in areas A and C retracts downward, the overall shrinkage and fixation are greater than that in area B. Area B is inhibited by the negative pressure adsorption, resulting in insufficient shrinkage and fewer folds than areas A and B. This makes the tensile deformation rate of areas A and C greater than that of area B.

[0043] S4. The convex structure is formed by molding 141, such as... Figure 12 As shown, the demolding wheel forming cavity mold 3 has several forming grooves 31 evenly distributed around its circumference. The forming grooves 31 are also provided with concave cavities 32. At this station, the crushed and dispersed wood pulp fibers are uniformly mixed with superabsorbent polymer and conveyed to the forming station under negative pressure. The demolding wheel mold with the front concave cavity 32 is used to spread and form the material. The material fills the concave cavity and naturally accumulates and thickens to form a native convex structure 141 with a length of 80-200mm, facing the perineum and biased towards the front of the core. By controlling the fan of the convex structure and controlling the different suction forces of the fans around the perimeter, the unit area weight of the convex structure 141 is 1-2 times that of the surrounding area. Then, local light pressure is applied to only shape the convex structure 141 to retain its high rigidity. No additional pressure is applied to the thin material area corresponding to the rear buttock groove to maintain its easy shrinkage characteristics.

[0044] Example 2 of the highly breathable, self-adaptive, fit-fitting, leak-proof menstrual sanitary panties provided by this invention: Its main difference from Example 1 is: In Example 1, the absorbent core 14 of the absorbent body 1 has a convex structure 141, which is located on the front side of the absorbent core 14 at a position corresponding to the female perineum. The length of the convex structure 141 is 80-200 mm.

[0045] like Figures 15-17As shown, in this embodiment, the absorbent core 14 of the absorbent body 1 is provided with a G-fold absorbent paper structure 142. The G-fold absorbent paper structure 142 is located on the front side of the absorbent core 14, corresponding to the female perineum. The length of the G-fold absorbent paper structure 142 is 80-200mm. The G-fold absorbent paper structure 142 is evenly distributed with several puncture points, which are arranged in a triangular pattern.

[0046] After puncture, the absorbent paper fibers are embedded into the lower composite core in a heat-fused state, forming physical anchor points. The absorbent paper between these anchor points, remaining fluffy due to the lack of puncture, is forced to bend upwards under the shrinkage stress of the elastic band (spandex filaments), forming an arch-like protrusion. This arch structure makes the area more secure and further increases its stiffness. Therefore, the elastic band in the punctured area at the front end has relatively less shrinkage; while the composite core area at the rear end, without the absorbent paper G-fold structure 142 and puncture, has lower stiffness, better elastic band shrinkage, and a greater shrinkage amount, thus more effectively conforming to the curve of the buttocks.

[0047] While various embodiments of the invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of the invention. The appended claims are intended to define the scope of the invention and therefore cover any modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A highly breathable, self-adaptive, leak-proof menstrual sanitary panty, comprising: Absorbent body (1), the length extension direction of the absorbent body (1) is defined as the front-to-back direction; Waist component (2) is stacked on the non-skin side of the absorbent body (1). Waist component (2) includes a sub-bottom layer (21) and a bottom layer (22). Its features are: The absorbent body (1) has arched protrusions (16) at both the front and rear ends. The front end of the arched protrusions (16) corresponds to the accordion-free area of ​​the waist component (2). The inner cavity of the arched protrusions (16) forms a hollow air channel, so that when the human body moves and squeezes the pants, the hot and humid air of the absorbent body (1) can be discharged to the side abdominal accordion-free area along the hollow air channel formed by the inner cavity of the arched protrusions (16). The waist component (2) has 5 elastic bands in the hip area coated with elastic adhesive, and the rest of the hip area is an area without adhesive. The elastic bands shrink to form a natural concave-convex hollow structure, which constitutes a transverse air channel. When the pants are compressed, the internal humid and hot air is discharged to both sides along the transverse air channel. The waist elastic area of ​​the waist component (2) is provided with coarse denier spandex yarn (24) and fine denier spandex yarn (23). The coarse denier spandex yarn (24) is located on the skin side of the waist component (2), and the fine denier spandex yarn (23) is located on the non-skin side of the waist component (2). The coarse denier spandex yarn (24) and the fine denier spandex yarn (23) are interleaved. The waist elastic area of ​​the waist component (2) is divided into area A, area B and area C in the transverse direction. Area A corresponds to the outer thigh when wearing, area C corresponds to the inner thigh when wearing, and area B is located in the transition position between area A and area C. The tensile deformation rate of area A, area B and area C is set to area A > area C > area B.

2. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 1, characterized in that: The width of the arched protrusion structure (16) is the same as the width of the absorbent body (1), and the length of the arched protrusion structure (16) is 0-30mm.

3. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 1, characterized in that: The composite area of ​​the waist component (2) and the absorbent body (1) is provided with an ultrasonic welding zone. The ultrasonic welding zone is used to achieve point breakage of the rubber band and prevent the waist component (2) from delamination and warping.

4. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 1, characterized in that: The coarse denier spandex filament (24) is fully glued and bonded to the skin side of the waist component (2) by hot melt adhesive, with no separation gap between it and the inner non-woven fabric of the waist component (2); the two ends of the fine denier spandex filament (23) are fixed by hot melt adhesive at the left and right sides of the waist and at the overlap position between the fine denier spandex filament (23) and the absorbent body (1), and the other areas of the fine denier spandex filament (23) are glue-free sections, and a gap is maintained between the fine denier spandex filament (23) and the outer and inner non-woven fabrics.

5. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 1, characterized in that: The absorbent core (14) of the absorbent body (1) is provided with a convex structure (141), which is located on the front side of the absorbent core (14) at a position corresponding to the female perineum.

6. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 5, characterized in that: The length of the convex structure (141) is 80-200 mm, and the ratio of the unit area weight of the convex structure (141) to the unit area weight of other areas of the surrounding absorbent core (14) is between 1 and 2.

7. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 1, characterized in that: The absorbent core (14) of the absorbent body (1) is provided with a G-fold absorbent paper structure (142) on the upper surface. The G-fold absorbent paper structure (142) is located on the front side of the absorbent core (14) corresponding to the female perineum. The length of the G-fold absorbent paper structure (142) is 80-200mm.

8. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 7, characterized in that: The G-fold absorbent paper structure (142) has several puncture points evenly distributed, and the puncture points are arranged in a triangular pattern.

9. The highly breathable, self-adaptive, leak-proof menstrual sanitary panty according to claim 1, characterized in that: The maximum expansion ratio of area A is 2.5-3.5 times, the maximum expansion ratio of area B is 1.2-1.8 times, and the maximum expansion ratio of area C is 2-3 times.

10. A method for preparing a highly breathable, self-adaptive, leak-proof menstrual sanitary panty, used to prepare the highly breathable, self-adaptive, leak-proof menstrual sanitary panty as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Arched protrusion structure (16) is formed. The absorbent body (1) is cut by the cutting equipment and combined with the waist component (2). The effective adsorption length of the suction cup at the cutting station is less than the total length of the absorbent body (1). During the suction operation, the front and rear edges of the absorbent body (1) each have a 0-30mm negative pressure adsorption area. The contact station with the suction cup consists of, from bottom to top, the surface layer (11), the guide layer (12), the absorbent core (14), and the bottom film (15). The outer bottom film (15) causes the suction cup to remove the air from the middle interlayer, which causes the middle multi-layer fabric to be compressed and shortened by negative pressure. The air is retained in the interlayer of the front and rear edges of the absorbent body (1), and the fabric remains relaxed and stretched, naturally stacking to form wave folds. When it is combined with the waist component (2) after being cut, it is simultaneously compacted and shaped, so that the front and rear sides of the absorbent body (1) permanently form an arched protrusion structure (16). S2. Installation of coarse denier spandex yarn (24) and fine denier spandex yarn (23); the coarse denier spandex yarn (24) is fully glued and evenly distributed on the inner side of the sub-bottom layer (21). The coarse denier spandex yarn (24) is sprayed with hot melt adhesive. The coarse denier spandex yarn (24) and the sub-bottom layer (21) are completely bonded without gaps, forming an inner layer of stress support; the fine denier spandex yarn (23) and the coarse denier spandex yarn (24) are arranged in parallel and staggered. The fine denier spandex yarn (23) is sprayed with hot melt adhesive at fixed points on the left and right sides of the waist and at the overlap position with the absorbent body (1) to fix the two ends of the fine denier spandex yarn. The spraying of adhesive is closed in the middle section of the waist. A through gap is reserved between the middle section of the fine denier spandex yarn and the sub-bottom layer (21) and the bottom layer (22); the fold gap is connected with the suspension gap of the fine denier spandex yarn (23) to form multiple breathable air channels extending laterally along the waist; In the forming and welding-cutting process of areas S3.A, B, and C, areas A and C are fixed by pins, and area B is fixed by negative pressure adsorption. After welding and cutting, the pins retract downwards. Since there are no suction holes at the pins, the spandex yarn naturally shrinks after cutting. When the pins in areas A and C retract downwards, the overall shrinkage and fixation are greater than that in area B. Area B is inhibited by the negative pressure adsorption, resulting in insufficient shrinkage and fewer pleats than areas A and B. This makes the tensile deformation rate of areas A and C greater than that of area B.

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