Pant-type absorbent articles and methods of making the same

Abstract

The application discloses a pant-type absorbent article and a preparation method thereof, and relates to the technical field of sanitary products. The pant-type absorbent article comprises a waist structure and an absorbent body. The waist structure is composed of elastic fabric with longitudinal and transverse elasticity. The absorbent body is fixed to the inner side of the waist structure. The two sides of the waist structure are connected by side sealing parts to form a closed structure through sewing, bonding, ultrasonic welding or hot-roller heat sealing. The elastic fabric is textile elastic fabric or full-elastic non-woven elastic cloth. The textile elastic fabric contains spandex core yarn, so that the textile elastic fabric has longitudinal and transverse elasticity at the same time. The problems that the existing period pant waist structure only has transverse elasticity, poor fit, easy displacement and strong hard feeling of the side sealing are solved.

Description

Technical Field

[0001] This invention relates to the field of hygiene products technology, specifically to a trouser-type absorbent product and its preparation method. Background Technology

[0002] Period panties, also known as menstrual pants, are protective underwear specifically designed for women during their menstrual period. They aim to solve problems such as side leakage, back leakage, and stuffiness associated with traditional sanitary napkins. They are disposable hygiene products that combine the form factor of underwear with absorbent properties. Currently, period panties on the market mainly consist of two parts: the waistband and the absorbent core. The absorbent core is typically composed of a surface layer, an absorbent core, and a leak-proof layer, fixed between the front and back panels of the waistband to absorb and hold menstrual blood. Elastic bands are added to the leg area for a snug fit. The waistband often uses a combination of non-woven fabric and elastic bands to form a closed system; a few products use longitudinally elastic non-woven fabric or elastic membrane as the waistband material.

[0003] For the existing closure system of menstrual pants, please refer to... Figure 1 The waistbands are made entirely of non-woven synthetic fibers, and consist of at least two layers of composite material. Due to the physical properties of non-woven fabrics, these waistbands can only provide elasticity in one direction (lateral) via elastic bands, lacking longitudinal elasticity. Therefore, they cannot achieve the 360-degree all-around elastic fit of woven underwear. The human waist and abdomen undergo multi-directional stretching and deformation during daily activities such as standing, sitting, and bending. A waistband with only lateral elasticity cannot adapt to longitudinal stretching and deformation, leading to shifting and chafing after prolonged wear, potentially causing leakage. Furthermore, the elasticity of elastic materials diminishes significantly after extended wear, further exacerbating the problem of loosening. In addition, the dense, multi-layered synthetic fiber composite structure results in insufficient breathability, causing a noticeable stuffy feeling when worn. Summary of the Invention

[0004] The main technical problem this invention addresses is how to balance the absorbency and leak-proof performance with the comfort of trouser-style absorbent products.

[0005] According to the first aspect, one embodiment provides a trouser-type absorbent article, comprising:

[0006] The waistband structure is made of elastic fabric with both longitudinal and lateral elasticity, and

[0007] An absorbent body is fixedly disposed on the inner side of the waist structure;

[0008] The two sides of the waist structure are connected by side sealing parts to form a closed structure. The side sealing parts are formed by at least one of the following: stitching, adhesive bonding, ultrasonic welding, or hot rolling.

[0009] In one embodiment, the elastic fabric is a textile elastic fabric or a fully elastic nonwoven elastic fabric, wherein the textile elastic fabric includes spandex core-spun yarn, which is formed by wrapping spandex filaments with at least one of polyester yarn, nylon yarn, acrylic yarn, polypropylene yarn, vinylon yarn, chlorofiber yarn or cotton yarn.

[0010] In one embodiment, the system further includes a leg band that is positioned along the leg edge path of the waist structure; and the side of the leg band facing away from the surface layer is covered with a wrapping layer for attaching to the elastic fabric and isolating the leg band from human skin.

[0011] In one embodiment, when the side sealing part is formed by ultrasonic welding, the mass ratio of cotton fiber in the elastic fabric does not exceed 50%.

[0012] In one embodiment, the absorbent body includes a top-to-bottom composite surface layer, an absorbent core, and a leak-proof layer. The upper surface of the surface layer is for contact with the human body, the absorbent core is for absorbing liquid, and the lower surface of the leak-proof layer is for composite with the waistband structure.

[0013] In one embodiment, the waist structure is configured as a continuous and complete one-piece structure, including a front waist piece, a middle section and a rear waist piece, and the lower surface of the absorbent body is bonded to the middle section of the waist structure.

[0014] In one embodiment, the waist structure is configured as a split structure, including a front waist piece and a back waist piece, with the front end of the absorbent body connected to the front waist piece and the rear end of the absorbent body connected to the back waist piece.

[0015] In one embodiment, the bottom surface of the absorber is coated with a bottom film layer.

[0016] According to a second aspect, one embodiment provides a method for preparing a trouser-type absorbent article, comprising the following steps:

[0017] Prepare the absorbent body; sequentially composite the surface layer, absorbent core, and leak-proof layer to form the absorbent body;

[0018] Prepare a waistband structure; attach leg elastic bands to the elastic fabric along the leg edge path by applying adhesive, and cover the leg elastic bands with a wrapping layer, thereby attaching the waist elastic bands to the elastic fabric; apply hot melt adhesive to the waist elastic bands, and then attach the waist elastic bands to the elastic fabric to form a waistband structure; wherein, the elastic fabric is an elastic fabric with longitudinal elasticity and transverse elasticity.

[0019] The absorbent is composited onto the waist structure by a negative pressure adsorption transfer method;

[0020] Cut the composite material;

[0021] The two sides of the waist structure are sealed at the sides, and then the final cut is performed to form a single piece of product. The side sealing is performed by at least one of the following methods: sewing with sewing machine thread, applying hot melt adhesive, ultrasonic welding, or hot rolling heat sealing.

[0022] Fold and package individual products into shape.

[0023] In one embodiment, the elastic fabric includes spandex core-spun yarn, which is formed by wrapping spandex filaments with nylon yarn or polyester yarn.

[0024] The absorbent trousers described in the above embodiments utilize an elastic fabric with both longitudinal and transverse elasticity to form the waistband structure. This overcomes the limitation of existing non-woven fabric and elastic band composite structures, which only possess transverse elasticity. The waistband structure can adaptively stretch and recover in both longitudinal and transverse directions with human movement, achieving a 360-degree fit to the waist and abdomen curves. This significantly reduces the risk of product shifting during wear and improves fit and stability. Furthermore, the side-sealing method used in the waistband, compared to existing heat-pressing bonding, results in a soft, non-hard feel on the waistband sides after sealing, significantly improving wearing comfort. The sewing and gluing processes have low requirements for fabric materials, allowing for the use of high-cotton-content elastic textiles, thus expanding the range of materials available for the waistband. The elastic textile fabric possesses elasticity comparable to woven underwear, with minimal elasticity loss even after overnight wear. This overcomes the elasticity loss problem of existing non-woven fabric and elastic band composite waistbands after several hours of wear, ensuring a snug fit throughout the entire wearing process. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a trouser-type absorbent product in the prior art;

[0026] Figure 2 This is a schematic diagram of the structure of a trouser-type absorbent article in one embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of a trouser-type absorbent product after folding in one embodiment;

[0028] Figure 4 This is a schematic diagram of the cross-sectional structure of the trouser-type absorbent article in another embodiment;

[0029] Figure 5 This is a schematic diagram of the structure of the trouser-type absorbent article in another embodiment;

[0030] Figure 6 This is a flowchart illustrating the preparation steps of a trouser-type absorbent article in one embodiment.

[0031] Figure label:

[0032] 1. Top layer; 2. Absorbent core; 3. Leak-proof layer; 4. Front waist panel; 5. Rear waist panel; 6. Leg band; 7. Waist band; 8. Side seal; 9. Bottom membrane layer; 10. Water-repellent side panel; 11. Diversion layer; 12. Middle section. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the invention. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present invention are not shown or described in the specification. This is to avoid obscuring the core parts of the invention with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0034] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0035] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages).

[0036] In this application, "longitudinal" refers to the direction along the human torso when the trouser-type absorbent article is worn, "inner side" and "upper surface" refer to the side of the trouser-type absorbent article facing the human skin when worn, and "outer side" and "lower surface" refer to the side away from the human skin.

[0037] In one embodiment, please refer to Figure 2This application provides a trouser-style absorbent product, including a waistband structure and an absorbent body. The absorbent body is fixedly disposed on the inner side of the waistband structure, and the two sides of the waistband structure are connected by side sealing portions 8 to form a closed trouser-style structure. The waistband structure is made of elastic fabric with longitudinal and transverse elasticity, allowing the waistband to adapt and stretch with human movement in both longitudinal and transverse directions, thereby achieving 360-degree close-fitting coverage of the waist and abdomen and effectively reducing the problem of product shifting during wear. The side sealing portions 8 are formed by at least one of the following: sewing with stitching, adhesive bonding, ultrasonic welding, or hot rolling.

[0038] Please refer to Figure 2 The two sides of the waistband structure are connected by side sealing portions 8 to form a closed structure. When worn, the waistband structure is in the shape of a ring cylinder, and its two sides are connected by side sealing portions 8 to form a closed system for trouser-style products. In a preferred embodiment, the side sealing portions 8 are formed by sewing with stitching or by adhesive bonding.

[0039] Specifically, stitching refers to sewing the side edges of the waistband structure together using a sewing machine. The sewing thread can be polyester, nylon, or cotton, and the stitch type can be plain stitch, overlock stitch, or coverstitch. Its advantages include: no special requirements for the waistband fabric material; it is suitable for cotton, synthetic fibers, and blended fabrics, offering wide material adaptability; the sewn area is smooth and soft, without any hard object feel, and will not cause discomfort due to skin friction when worn; it has high sealing strength, with the fabric breaking before the sealing point during testing, far superior to regular menstrual pants; and the sewing thread itself has elasticity and stretches with the fabric when the waistband is stretched, without restricting the elasticity of the waistband structure.

[0040] Specifically, adhesive bonding molding refers to applying hot melt adhesive or pressure-sensitive adhesive to the side edges of the waistband structure and bonding the two together. The adhesive can be a hot melt adhesive, heat-sealing adhesive, or water-based adhesive. Its advantages include fast bonding speed, suitable for high-speed online production; the bonded area is also smooth and soft, with minimal hardness; it has good adhesion to most textile fabrics, offering wide material adaptability; and it eliminates the need for sewing needles and thread, avoiding the risk of liquid leakage from needle holes.

[0041] In a preferred embodiment of the present invention, the side sealing part 8 is formed by stitching or adhesive bonding. Both methods are not limited to the material of the waistband fabric and can be applied to any elastic textile fabric, including pure cotton fabric.

[0042] In one embodiment, the elastic fabric is a textile elastic fabric. The textile elastic fabric achieves full elasticity in both the warp and weft directions by using spandex filaments as a core, and wrapping the spandex filaments with at least one of nylon yarn, polyester yarn, acrylic yarn, polypropylene yarn, vinylon yarn, chlorofiber yarn, or cotton yarn to form a spandex core-spun yarn. In this embodiment, nylon yarn or polyester yarn is used to wrap the spandex filaments; then, the spandex core-spun yarn is used as the raw material for weaving. Because the weaving process forms a fabric with a warp and weft structure, the spandex can provide elastic recovery in both the warp and weft directions, thus giving the fabric both longitudinal and transverse elasticity.

[0043] Specifically, when the fabric is in its natural state, the spandex filaments are curled and wrapped inside the yarn; when the fabric is stretched longitudinally or laterally, the spandex filaments are straightened and elongated, generating a shrinkage force; when the external force is removed, the spandex filaments return to their curled state, and the fabric shrinks back to its original size. This two-way elastic structure in both warp and weft directions allows the waistband to adapt to the multi-directional stretching and deformation of the waist and abdomen during the user's daily activities such as standing, sitting, bending over, and turning, always maintaining a close fit to the body's curves.

[0044] Specifically, in this embodiment, the spandex content in the elastic textile fabric is 5% to 25% by mass. When the spandex content is less than 5%, the fabric lacks elasticity, and the waistband's ability to conform to and recover the body's waist and abdomen decreases; when the spandex content is greater than 25%, the fabric's breathability decreases, affecting wearing comfort. Therefore, controlling the spandex content within the range of 5% to 25% achieves a balance between elasticity and breathability.

[0045] In other specific embodiments, the specific material of the elastic textile fabric can be a blend of modal and spandex, a blend of Tencel and spandex, a blend of nylon and spandex, or a blend of polyester and spandex. All of the above blended fabrics are woven based on a spandex core-spun yarn structure, possessing good elasticity in both the warp and weft directions. Compared with existing nonwoven fabric and elastic composite structures, the elasticity durability is significantly improved, and the elasticity remains essentially unchanged even after wearing continuously overnight.

[0046] In another embodiment, the elastic fabric is a fully elastic nonwoven fabric, such as a TPU composite fabric, which is elastic in both the longitudinal and transverse directions and can be used as an alternative to textile elastic fabrics. In addition, TPU material is thermoplastic and is suitable for use with ultrasonic welding process for waistband side sealing.

[0047] In one embodiment, when the side seal 8 is formed by ultrasonic welding, the mass percentage of cotton fibers in the elastic fabric does not exceed 50%. Ultrasonic welding relies on the material generating heat and fusing under ultrasonic vibration and friction. Cotton fibers lack thermoplasticity and cannot be effectively fused by ultrasound. When the mass percentage of cotton fibers exceeds 50%, the sealing strength of the ultrasonic welding decreases significantly, failing to meet usage requirements. Therefore, when using ultrasonic welding, the mass percentage of cotton fibers in the elastic fabric must be limited to within 50% to ensure sealing reliability.

[0048] Please refer to Figure 2 In one embodiment, the absorbent body includes, from top to bottom, a surface layer 1, an absorbent core 2, and a leak-proof layer 3, which are sequentially laminated. The upper surface of the surface layer 1 is for contact with human skin. The absorbent core 2 is located between the surface layer 1 and the leak-proof layer 3 and is used to absorb and store liquid. The leak-proof layer 3 is located at the bottom of the absorbent body, and its lower surface is used for lamination with the waistband structure. The leak-proof layer 3 prevents liquid from leaking out and serves as the lamination bonding surface between the absorbent body and the waistband structure.

[0049] Specifically, the surface layer 1 is made of hydrophilic nonwoven fabric, preferably hot-air nonwoven fabric or spunbond nonwoven fabric. The surface layer 1 is permeable to liquids, allowing menstrual blood to quickly pass through and enter the absorbent core 2, while keeping the surface dry and reducing backflow. A flow-guiding layer 11 is provided between the surface layer 1 and the absorbent body to quickly guide liquids to the absorbent core 2. The absorbent core 2 is located below the flow-guiding layer 11 and is the core absorbent component of the menstrual panty. The absorbent core 2 can be composed of a mixture of superabsorbent polymer and fluff pulp, or it can be formed by wrapping superabsorbent polymer with lint-free paper, or it can be composed of composite core materials. The leak-proof layer 3 prevents liquid leakage while allowing gas to pass through to maintain breathability; the waistband structure is generally located below the breathable membrane. Water-repellent edges 10 are provided on both sides of the absorbent body, extending along the longitudinal edge of the absorbent body to prevent liquid leakage from the sides. Elastic waistbands 7 are arranged at the waistband cuff of the elastic fabric, thus providing an elastic tightening function to the waistband.

[0050] In this embodiment, the layers of the absorbent are bonded together using an adhesive. Hot melt adhesive can be used to bond adjacent layers by full-width coating or patterned coating to form a whole. The bonding method can be hot-rolling bonding, ultrasonic bonding, or adhesive bonding; in this embodiment, adhesive bonding is preferred. Furthermore, the layers of the absorbent can be added or removed as needed without affecting its bonding connection with the waistband structure.

[0051] Please refer to Figure 3In one embodiment, the trouser-style absorbent product further includes a leg elastic band 6, which is disposed along the leg edge path of the waistband structure. A wrapping layer is attached to the side of the leg elastic band 6 facing away from the skin, isolating the leg elastic band 6 from the skin. The wrapping layer is made of non-woven or woven fabric and is adhered to the upper part of the leg elastic band 6 by adhesive. The width of the wrapping layer is greater than the width of the leg elastic band 6, completely covering the leg elastic band 6. This prevents direct contact between the skin and the elastic band, thereby eliminating the foreign body sensation caused by the leg elastic band 6 and improving wearing comfort.

[0052] In one embodiment, the leg band 6 is a semi-enclosed leg structure, meaning the elastic band is set along a portion of the leg band edge, covering only the front and inner sides of the thigh root. Alternatively, the leg band 6 is a full-enclosed structure, meaning the elastic band is arranged in a ring along the entire leg band edge, forming a complete elastic leg opening.

[0053] In this embodiment, when arranging the waist elastic band 7, hot melt adhesive is applied to the waist elastic band 7, and then the waist elastic band 7 is attached to the elastic fabric. This method ensures that the hot melt adhesive is evenly distributed on the surface of the waist elastic band 7, resulting in a firm bond. It also adapts to the repeated stretching characteristics of the elastic fabric, ensuring stable adhesion of the waist elastic band 7 during wear. A wrapping layer can also be provided to isolate the skin.

[0054] Please refer to Figure 3 In one embodiment, the waistband structure is a continuous, one-piece structure made of a single piece of elastic fabric, including a front waist piece 4, a middle section 12, and a back waist piece 5, which are continuous and seamless. The middle section 12 corresponds to the crotch area, and the lower surface of the absorbent material is glued to the middle section 12 of the waistband structure. The front waist piece 4 corresponds to the front waist of the body, and the back waist piece 5 corresponds to the back waist of the body. The one-piece waistband structure and the absorbent material form a whole, and the waistband structure is a continuous, one-piece ring of fabric. The waistband structure provides continuous coverage of the waist and abdomen, with no seams between the front and back waist pieces, resulting in better leg coverage and leak-proof performance, and a better fit. At the same time, the one-piece waistband structure distributes stress more evenly, fully utilizing the warp and weft elasticity of the textile fabric, ensuring that the product always fits the body during wear.

[0055] Reference Figure 4 In another embodiment, the waistband structure is a separate structure, with a bottom film layer 9 laminated to the bottom surface of the absorbent body. The waistband structure includes independently set front waist piece 4 and back waist piece 5. The front waist piece 4 corresponds to the abdominal area of ​​the human body when worn, and the back waist piece 5 corresponds to the back area of ​​the human body. The front waist piece 4 and back waist piece 5 are cut from elastic fabric. The front waist piece 4 and back waist piece 5 correspond to the front waist and back waist of the human body, respectively. The front end of the absorbent body overlaps the inside of the front waist piece 4 and connects to the front waist piece 4, and the rear end of the absorbent body overlaps the inside of the back waist piece 5 and connects to the back waist piece 5. The connection is made by adhesive or sewing.

[0056] The split waistband structure covers only the front and back waistband areas, eliminating the need for waistband fabric in the crotch area. This saves on waistband material and reduces production costs. Furthermore, since the absorbent core directly spans between the front and back waistband panels, it effectively connects to the crotch area, contributing to the stability of the crotch structure.

[0057] The disadvantages of the split structure are: the front waist piece 4 and the back waist piece 5 are separate structures and need to be connected to the absorbent body separately, making the assembly process relatively complicated; and it lacks the ring-shaped wrapping of a whole piece of waist fabric, so the fit is slightly inferior to the one-piece structure.

[0058] In addition, in the split structure, the leak-proof layer 3 of the absorbent body will be directly exposed in the area outside the waistband connection. By composite bottom film layer 9 on the bottom surface of the absorbent body, the leak-proof layer 3 can be protected to avoid exposure and damage, while improving the reliability of the composite connection between the absorbent body and the front waistband 4 and the rear waistband 5.

[0059] In one embodiment, please refer to Figure 5 This application also provides a method for preparing a trouser-type absorbent article, which includes the following steps:

[0060] S1: Preparation of absorber.

[0061] The surface layer 1, absorbent core 2, and leak-proof layer 3 are sequentially laminated to form an absorbent body. The surface layer 1, absorbent core 2, and leak-proof layer 3 are stacked from top to bottom and bonded together as a single unit using an adhesive method.

[0062] The surface layer 1 is made of hydrophilic hot-air nonwoven fabric, the absorbent core 2 can be made of a core mixed with SAP and fluff pulp, and the leak-proof layer 3 can be made of PE breathable membrane. The composite multilayer material forms a strong interlayer bond under the action of the pressing roller, forming a continuous inner absorbent material width, which is then die-cut or cut to form individual absorbent units.

[0063] If a separate waistband structure is adopted, a bottom membrane layer 9 needs to be further laminated below the leak-proof layer 3 to prevent the leak-proof layer 3 from being exposed. At the same time, the layer structure of the absorbent can also be designed according to the product's functional requirements, and functional layers such as guide layers can be added as appropriate, with each layer composited to form an integrated absorbent.

[0064] S2: Prepare the waist structure.

[0065] Apply hot melt adhesive along the edge of the leg circumference to the elastic fabric, attach the leg circumference elastic band 6 to the elastic fabric, and then cover the leg circumference elastic band 6 with a wrapping layer to isolate the leg circumference elastic band 6 from the skin; apply hot melt adhesive to the waist elastic band 7, and then attach the waist elastic band 7 to the waist circumference gathering area of ​​the elastic fabric to form the waist structure.

[0066] Elastic fabrics have both longitudinal and transverse elasticity, including at least one of the following: modal and spandex blends, Tencel and spandex blends, nylon and spandex blends, polyester and spandex blends, or fully elastic nonwoven fabrics.

[0067] Specifically, the elastic fabric is woven from spandex core-spun yarn. The leg circumference elastic band 6 can be made of 500 D bare spandex elastic band. The wrapping layer material is made of non-woven fabric strips or the same elastic fabric as the waistband structure. The width of the wrapping layer covers the width of the elastic band. The wrapping layer is bonded to the fabric with hot melt adhesive so that the elastic band is completely wrapped between the fabric and the wrapping layer.

[0068] S3: Incorporate the absorbent material into the waistband structure.

[0069] The absorber obtained in step S1 is transferred and composited onto the waist structure obtained in step S2 using a negative pressure adsorption transfer method. On a continuous production line, the absorber unit formed in step S1 is precisely transferred to a predetermined position on the waist structure material width formed in step S2 under the adsorption action of the negative pressure adsorption transfer wheel, realizing the positioning and composite of the absorber and the waist structure.

[0070] Specifically, the transfer wheel has adsorption holes on its surface. Negative pressure attracts the absorbent to the wheel surface. As the wheel rotates to the position where it intersects with the waistband material, the negative pressure is released, and the absorbent is released and adheres to the adhesive area on the waistband material. During this process, the lower surface of the absorbent's leak-proof layer 3 is bonded to the waistband fabric using pre-applied hot melt adhesive.

[0071] For the one-piece waistband structure, the absorbent body is directly bonded to the inner side of the middle section 12 of the waistband width; for the separate waistband structure, the center of the waistband material width has been pre-cut to form the front waistband 4 and the back waistband 5 areas, the front end of the absorbent body is bonded to the front waistband 4 area, and the rear end is bonded to the back waistband 5 area.

[0072] S4: Cut the composite material to obtain the blank of a single product.

[0073] Specifically, a die-cutting roller or a rotary cutter is used to cut the composite material width, removing excess edge material so that the product forms a predetermined shape along the longitudinal direction.

[0074] S5: Side Sealing and Final Cut. Fold the cut material in half and sew it together with a sewing machine or apply hot melt adhesive to seal the sides of the waistband.

[0075] The cut material is folded in half lengthwise using a folding mechanism, aligning the front and back waistbands. The sides of the waistband are then immediately sealed. This sealing is achieved either by machine sewing or by applying hot melt adhesive. When machine sewing is used, an online sewing mechanism is installed at the waistband sealing station to automate the online sewing of the fully elastic textile waistband, introducing the side-sealing technology from woven underwear into the production process of non-woven absorbent products.

[0076] When using a sewing machine, sewing machine heads are installed on both sides of the production line, continuously stitching the aligned waistband sides. The sewing machine head's stitching speed is synchronized with the production line speed to achieve continuous online sewing. The stitches can be overlock stitches or plain stitches. When using adhesive bonding, hot melt adhesive spray guns or coating wheels are installed on both sides of the production line. After the waistband sides are aligned, hot melt adhesive is applied immediately and pressed together.

[0077] After sealing, a final cut is performed to cut the continuous product into individual pieces.

[0078] S6: Folding and Packaging. Fold the individual product pieces from S5 and place them into the packaging film to complete the packaging.

[0079] Specifically, after final cutting, the single-piece product is folded once or multiple times by a folding mechanism. The folded product then enters the packaging process, where it is wrapped and sealed with packaging material to form a single-package finished product.

[0080] Compared with traditional menstrual pants production lines, this application, when using sewing machine thread stitching, only requires adding a sewing mechanism at the side sealing waistband station to achieve fully automated continuous production of fully elastic textile waistband pants-type absorbent products.

[0081] In one embodiment, the performance of the absorbent trousers of this application was compared with that of existing nonwoven fabric and elastic composite waistband menstrual trousers. Specific test results are shown in Table 1.

[0082] Table 1: Performance comparison of the product in this application with existing menstrual pants.

[0083] breathability GB / T 5453 2140 mm / s greater than 3000 mm / s elastic decay rate Airbag-type wear pressure tester (after 8 hours of wear) Attenuation of approximately 10% Very slow / virtually no decay Waist side seal strength Tensile test 12～30 N Material breaking occurs when the load exceeds 30 N / test.

[0084] As shown in Table 1, the breathability test was conducted according to GB / T 5453 standard. The breathability test data of existing non-woven fabric and elastic composite waistband menstrual pants is 2140 mm / s. This invention uses a single-layer woven elastic fabric to replace the existing technology's composite structure of at least two layers of non-woven materials. The fabric has high porosity and its breathability is significantly better than existing products, effectively reducing the stuffiness of wearing it. The elasticity decay rate was measured using an airbag-type wearing pressure tester, measuring the pressure values ​​at different positions when wearing and after about 8 hours of wear. Existing non-woven fabric and elastic composite waistbands lose about 10% of their elasticity after about 8 hours of wear. Elasticity decay directly leads to product loosening, exacerbating the risk of shifting and groin pinching. This invention uses a woven elastic fabric with a spandex core-spun yarn structure that has excellent fatigue resistance. Similar to woven underwear fabrics, even after dozens of washes, the elasticity decay is still very slow. After 8 hours of wear, the waistband pressure value remains basically unchanged, maintaining a close fit to the waist and abdomen. The side seal strength test was conducted using a tensile testing machine to perform a tensile test on the waist side seal 8, and the maximum tensile force value at which the seal failed was recorded. The results showed that the side seal strength of existing menstrual pants is generally 12-30N, while the side seal strength of the product in this application reached the breaking point or greater than 30N during the test, ensuring the structural integrity of the product during vigorous activities.

[0085] Understandably, without changing the core structural mechanism mentioned above, elastic fabrics are not limited to the specific materials mentioned above. Other elastic textile fabrics containing spandex, such as cotton and spandex blends, can also be used, as long as they can have both longitudinal and transverse elasticity. When using ultrasonic welding for side sealing, the proportion of cotton fiber in the fabric must be controlled to within 50%.

[0086] Understandably, the attachment process of the leg elastic band 6 can be adjusted according to the production equipment conditions. The hot melt adhesive attachment process of the leg elastic band 6 and the hot melt adhesive application process of the waist elastic band 7 are both designed to ensure that the elastic band can still be stably attached after repeated stretching of the elastic fabric.

[0087] This document describes various exemplary embodiments with reference to them. However, those skilled in the art will recognize that changes and modifications can be made to the exemplary embodiments without departing from the scope of this document. For example, various operational steps and components for performing operational steps can be implemented in different ways depending on the specific application or considering any number of cost functions associated with the operation of the system (e.g., one or more steps can be deleted, modified, or combined with other steps).

[0088] While the principles herein have been illustrated in various embodiments, numerous modifications to the structures, arrangements, proportions, elements, materials, and components, particularly suited to specific environments and operational requirements, may be used without departing from the principles and scope of this disclosure. These modifications and other alterations or alterations will be included within the scope of this document. Those skilled in the art will recognize that many changes can be made to the details of the above embodiments without departing from the fundamental principles of the invention.

Claims

1. A trouser-style absorbent product, characterized in that, include: The waistband structure is made of elastic fabric with both longitudinal and lateral elasticity, and An absorbent body is fixedly disposed on the inner side of the waist structure; The two sides of the waist structure are connected by side sealing parts (8) to form a closed structure. The side sealing parts (8) are formed by at least one of the following: stitching, adhesive bonding, ultrasonic welding, or hot rolling.

2. The trouser-type absorbent article as described in claim 1, characterized in that, The elastic fabric is a textile elastic fabric or a fully elastic nonwoven elastic fabric, wherein the textile elastic fabric includes spandex core-spun yarn, which is formed by wrapping spandex filaments with at least one of polyester yarn, nylon yarn, acrylic yarn, polypropylene yarn, vinylon yarn, chlorofiber yarn or cotton yarn.

3. The trouser-type absorbent article as described in claim 1, characterized in that, It also includes a leg elastic band (6), which is arranged along the leg edge path of the waist structure; and the leg elastic band (6) is covered with a wrapping layer on the side away from the surface layer (1), which is used to attach to the elastic fabric and isolate the leg elastic band (6) from human skin.

4. The trouser-type absorbent article as described in claim 1, characterized in that, When the side sealing part (8) is formed by ultrasonic welding, the mass ratio of cotton fiber in the elastic fabric does not exceed 50%.

5. The trouser-type absorbent article as described in claim 1, characterized in that, The absorbent comprises a top-to-bottom composite surface layer (1), a flow guiding layer (11), an absorbent core (2), and a leak-proof layer (3). The upper surface of the surface layer (1) is for contact with the human body. The flow guiding layer (11) is for guiding liquid to the absorbent core (2). The absorbent core (2) is for absorbing liquid. The lower surface of the leak-proof layer (3) is for composite with the waistband structure.

6. The trouser-type absorbent article as described in any one of claims 1-5, characterized in that, The waist structure is configured as a continuous and complete one-piece structure, including a front waist piece (4), a middle section (12) and a rear waist piece (5), with the lower surface of the absorbent body bonded to the middle section (12) of the waist structure.

7. The trouser-type absorbent article as described in any one of claims 1-5, characterized in that, The waist structure is configured as a split structure, including a front waist piece (4) and a back waist piece (5). The front end of the absorbent body is connected to the front waist piece (4), and the rear end of the absorbent body is connected to the back waist piece (5).

8. The trouser-type absorbent article as described in claim 7, characterized in that, The bottom surface of the absorber is coated with a bottom film layer (9).

9. A method for preparing a trouser-type absorbent product, characterized in that, Includes the following steps: Prepare the absorbent body; combine the surface layer (1), absorbent core (2), and leak-proof layer (3) in sequence to form the absorbent body; Prepare a waist structure; attach leg elastic bands (6) to the elastic fabric along the leg edge path by applying adhesive, and cover the leg elastic bands (6) with a wrapping layer, thereby attaching waist elastic bands (7) to the elastic fabric; apply hot melt adhesive to waist elastic bands (7), and then attach waist elastic bands (7) to the elastic fabric to form a waist structure; wherein, the elastic fabric is an elastic fabric with longitudinal elasticity and transverse elasticity; The absorbent is composited onto the waist structure by a negative pressure adsorption transfer method; Cut the composite material; The two sides of the waist structure are sealed at the sides, and then the final cut is performed to form a single piece of product. The side sealing is performed by at least one of the following methods: sewing with sewing machine thread, applying hot melt adhesive, ultrasonic welding, or hot rolling heat sealing. Fold and package individual products into shape.

10. The method for preparing the trouser-type absorbent article as described in claim 9, characterized in that, The elastic fabric includes spandex core-spun yarn, which is formed by wrapping spandex filaments with at least one of polyester yarn, nylon yarn, acrylic yarn, polypropylene yarn, vinylon yarn, chlorofiber yarn, or cotton yarn.

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