Elastic composite and disposable pant product

Abstract

The present application provides an elastic composite material, which comprises: a micro-elastic non-woven fabric, and an elastic layer arranged close to the micro-elastic non-woven fabric; wherein the micro-elastic non-woven fabric contains the following components by weight: 45-55% of polypropylene, 42-52% of elastomer, 1-2% of white masterbatch, and 0.5-1.5% of soft masterbatch. The present application also provides a pant product, which comprises a waist assembly of the elastic composite material of the present application, or is formed by the elastic composite material of the present application. The use of the elastic composite material of the present application to prepare the waist part of the pant product can improve the comfort and fit of the adult pant product, reduce the marks and red marks of the waist part, reduce the amount of hot melt adhesive used in the waist part of the product, reduce the odor, reduce the cost, simplify the production process, and be beneficial to environmental protection. At the same time, the use of the micro-elastic non-woven fabric in the elastic composite material of the present application can make the waist non-woven fabric material soft and light.

Description

Elastic composite materials and disposable trouser products Technical Field

[0001] This invention belongs to the field of daily necessities. Specifically, this invention relates to elastic composite materials and disposable trousers. More specifically, this invention relates to a disposable trouser product that provides a wearing experience equivalent to formal underwear, including infant trousers, women's trousers, and adult trousers. Background Technology

[0002] Most disposable trousers on the market are made by bonding non-woven fabric to an elastic layer (film, elastic strands, and / or fiber structure) with hot melt adhesive at the top waistband to lift the garment and prevent it from slipping off. However, this design often results in thin elastic bands that leave marks and red welts, and the strong odor of the hot melt adhesive can easily lead to consumer complaints.

[0003] Meanwhile, disposable trousers typically use hot-air nonwoven or spunbond nonwoven fabrics as the waistband components, making it impossible to simultaneously achieve both softness and lightweight properties. Specifically, hot-air nonwoven fabric is a type of thermally bonded nonwoven fabric, produced by using hot air from a drying device to penetrate the fiber web after short fibers are carded, causing it to bond together. Spunbond nonwoven fabric is made by extruding and stretching polymers to form continuous filaments, laying these filaments into a web, and then bonding the web through self-bonding, thermal bonding, chemical bonding, or mechanical reinforcement methods.

[0004] In addition, all infant / women / adult pants products on the market currently use a conventional leg shape design, which not only has poor coverage but also tends to produce more loose edges (i.e., ineffective edges), affecting the comfort and fit of wearing them, and also easily causing urination problems.

[0005] In addition, all infant / women's / adult trousers currently on the market use a conventional waistband sealing design to ensure the product stays in place and doesn't fall off. Specifically, the existing method involves using an ultrasonic mold or a thermoforming mold to melt and press the front and back waistband nonwoven fabrics together at the waistband sealing area at high temperature. Existing ultrasonic or thermoforming molds use a 5-10mm wide patterned roller to create raised patterns that enhance the bonding strength between materials. The bottom of the sealing layer consists of two layers of outer waistband nonwoven fabric and two layers of inner waistband nonwoven fabric (made of spunbond or hot-air nonwoven fabric, with thicknesses of approximately 0.15mm / layer or 0.45mm / layer, respectively); the top of the sealing layer consists of four layers of outer waistband nonwoven fabric and two layers of inner waistband nonwoven fabric (made of spunbond or hot-air nonwoven fabric, with thicknesses of approximately 0.15mm / layer or 0.45mm / layer, respectively). High-end products also include an elastic membrane material (approximately 1.6mm thick). All the above materials are layered together and solidified into a single unit under the melting and pressing action of an ultrasonic mold or a hot-pressing mold. Therefore, the edge seal is thick, the composite distance is wide (generally 10-15 mm), and the strength fluctuates greatly (800-3200 gf).

[0006] Consumers generally experience the following problems with conventional waistband sash designs: Large fluctuations in strength lead to accidental breakage / tearing (too weak) or inability to tear (too strong) during daily use, resulting in consumer complaints; the appearance is unattractive, especially in summer when wearing light clothing, giving consumers a bulky and cumbersome feeling; poor privacy, with the sash easily leaving marks at the waistband; excessively thick and stiff sashes can leave marks on the skin and occasionally cause skin irritation; and poor comfort.

[0007] Therefore, there is an urgent need for a trouser product that improves appearance, comfort and fit, reduces side leakage, reduces waist marks and red marks, reduces the amount of hot melt adhesive used in the waist area, reduces odor, lowers costs, simplifies production processes and is environmentally friendly; at the same time, it can also take into account the softness and thinness of the non-woven fabric material in the waist area. Summary of the Invention

[0008] The purpose of this invention is to provide an elastic composite material that can replace conventional elastic bands for lifting and securing the waistband, ensuring that the product remains unaffected while increasing comfort, reducing marks and redness, and providing users with a more premium product experience, much like wearing real underwear. Simultaneously, this elastic composite material has the feel of fabric, maintaining performance while also possessing good softness and drape, and is relatively thin and breathable.

[0009] Another object of the present invention is to provide a trouser product with an invisible side seal design, which enhances the appearance and the comfort of the wearer.

[0010] The above-mentioned objective of the present invention is achieved through the following technical solution.

[0011] In the context of this invention, the machine direction (MD direction) refers to the direction of machine operation, and the (CD) direction refers to the direction perpendicular to the direction of machine operation.

[0012] In a first aspect, the present invention provides an elastic composite material comprising:

[0013] Micro-elastic nonwoven fabric, and

[0014] An elastic layer is disposed adjacent to the micro-elastic nonwoven fabric;

[0015] The micro-elastic nonwoven fabric comprises the following components by weight:

[0016] 45-55% polypropylene, 42-52% elastomer, 1-2% white masterbatch and 0.5-1.5% soft masterbatch.

[0017] Preferably, in the elastic composite material of the present invention, the elastomer is a fiber elastomer, typically referring to polyurethane elastomer fibers. Through high elongation at break, low modulus, and high elastic recovery rate, the elastomer of the present invention can achieve high elongation, resilience, and air permeability; preferably, the elastomer is selected from VISTAMAXX. TM One or both of PERFORMANCE polymers and Lycra polymers.

[0018] Preferably, in the elastic composite material of the present invention, the white masterbatch is made of polypropylene or polyester polymer; more preferably, the white masterbatch is selected from one or more of POLYWHITE 80608SP WHI masterbatch, white masterbatch MILK8008 purchased from Shulman Plastics (Dongguan) Co., Ltd., and W6080J produced by Juxing Company.

[0019] Preferably, in the elastic composite material of the present invention, the soft masterbatch, also known as a nonwoven fabric softening and toughening agent, is one of the important auxiliary materials in nonwoven fabric products. The main raw materials include epoxidized polyamide, polyurethane elastomer, polyol, stearic acid, etc.; preferably, the soft masterbatch is selected from one or more of GH002 masterbatch, Jinchun soft masterbatch 5068MJ and Foshan Baole's SF001.

[0020] This invention uses micro-elastic nonwoven fabric instead of conventional hot-air nonwoven fabric or spunbond nonwoven fabric, so that the elastic composite material of this invention has the feel of fabric, while ensuring performance and having good softness and drape, and is also relatively thin and breathable.

[0021] The microelastic nonwoven fabric used in this invention has the following technical specifications:

[0022] 1. Longitudinal tensile strength in the MD direction (product length direction): not less than 55 N / 2 inch (inch represents inches), based on ASTM D5035 test method;

[0023] 2. Longitudinal elongation in the MD direction (product length direction): 60%-80%, based on ASTM D5035 test method;

[0024] 3. Transverse tensile strength in the CD direction (product width direction): not less than 18 N / 2 inch, based on ASTM D5035 test method;

[0025] 4. Lateral elongation in the CD direction (product width direction): 250%-350%, based on ASTM D5035 test method;

[0026] 5. The CD direction (product width direction) has a 1.5x recovery rate of ≥40% (see Figure 1):

[0027] Where L0 represents the test length, L1 represents the tensile length, L3 represents the recovery length, and L4 represents the tensile deformation length.

[0028] a. Elastic recovery rate = L3 / L1;

[0029] b. 1.5 times the constant elongation ratio: L1 / L0 = 1.5;

[0030] c. 1.5 times recovery rate: After stretching the nonwoven fabric of length L0 from point B to point C by 1.5 times (length L1), relax it and let the nonwoven fabric shrink back to point D. Measure the length L3. 1.5 times recovery rate: L3 / L1.

[0031] Preferably, in the elastic composite material of the present invention, the elastic layer is an elastic band, and the elastic band comprises polyester and spandex filaments.

[0032] Preferably, in the elastic composite material of the present invention, the elastic band comprises, by weight, the following components: 75%-95% polyester and 5%-25% spandex filament.

[0033] Preferably, in the elastic composite material of the present invention, the width of the elastic band is 10-50 mm.

[0034] This invention uses elastic bands made of clothing fabric to replace conventional elastic bands. The width range can also be widened to a maximum of 50mm according to usage needs. It is composite and fixed by hot pressing, ultrasonic pressing mold, or hot melt adhesive bonding with reduced usage and area. This ensures that the product is not affected when worn, greatly increases comfort, reduces the generation of marks and red marks, and provides users with a more high-end product consumption experience, just like wearing real underwear.

[0035] Preferably, in the elastic composite material of the present invention, to ensure sufficient elasticity and waist circumference space, the elastic recovery rate of the elastic band is 120%-250%. The formula for calculating the elastic recovery rate (k) is: k = b / a * 100%, where a is the length of the elastic band in its natural state and b is the length of the elastic band after stretching.

[0036] In this invention, the elastic layer adjacent to the micro-elastic nonwoven fabric can be achieved in various ways. In one specific embodiment of this invention, a hollow, glue-free design can be adopted for the waistband elastic band (CD direction, i.e., the transverse direction of the product, with end-sealing adhesive applied to both ends, allowing the middle elastic band to move freely and providing the required elasticity). Specifically, referring to Figures 2, 3, and 4 of this invention, the waistband nonwoven fabric is wrapped back longitudinally (MD direction) and bonded at "position 2" using hot melt adhesive, hot pressing, ultrasonic pressing, or other methods.

[0037] In one specific embodiment of the present invention, the elastic layer adjacent to the micro-elastic nonwoven fabric can be made into a single part as a whole waist elastic layer (such as an elastic band), and then bonded to the waist nonwoven fabric by hot melt adhesive or ultrasonic mold pressing (see Figure 5).

[0038] Preferably, in the elastic composite material of the present invention, the elastic layer is composed of or contains SEBS copolymer.

[0039] Preferably, in the elastic composite material of the present invention, the elastic layer acts as an adhesive to bond itself and the micro-elastic nonwoven fabric to form the elastic composite material, and the elastic layer imparts elasticity to the elastic composite material.

[0040] Preferably, in the elastic composite material of the present invention, the elastic layer is a continuous layer or a discontinuous layer.

[0041] Preferably, in the elastic composite material of the present invention, the elastic composite material has longitudinal and transverse dimensions, and the elastic layer comprises a plurality of adhesive elastic strips oriented longitudinally or transversely, and the plurality of adhesive elastic strips are spaced apart from each other in the transverse or longitudinal direction. In some embodiments of the present invention, the adhesive elastic strips have an aspect ratio of 2 to 100.

[0042] Preferably, in the elastic composite material of the present invention, the density of the SEBS copolymer is 0.88-0.96 g / cm³. 3 More preferably, it is 0.96 g / cm³. 3 .

[0043] Preferably, in the elastic composite material of the present invention, the basis weight of the elastic layer is 60 g / m² or lower, more preferably 48-50 g / m².

[0044] In this invention, styrene-ethylene-butene-styrene, abbreviated as SEBS, is an important thermoplastic elastomer (TPE) with properties similar to rubber, requiring no vulcanization. SEBS yarn can be used in the form of monofilaments, or it can be melted in a molten pool and spun into a nonwoven fabric through spinnerets (extrusion) to function as an elastic band (rubber). SEBS material begins to melt (without cracking) at a temperature of approximately 80°C, and when melted, it exhibits properties similar to hot melt adhesives, enabling it to bond materials together.

[0045] Based on the aforementioned properties of SEBS, the inventors of this invention have creatively used SEBS material to manufacture elastic waistband composite materials. By melting SEBS material online to make it viscous, SEBS is then sprayed or spin-coated onto a nonwoven fabric as an adhesive, bonding the micro-elastic nonwoven fabric of the waistband to itself (preferably using a hollow, adhesive-free design similar to a waistband elastic band, where the waistband nonwoven fabric is longitudinally reversed and bonded using the adhesive properties of the SEBS material). This allows SEBS material to simultaneously provide both tensile and adhesive properties to the elastic waistband composite material. The resulting elastic waistband material can replace current waistband elastic bands and adhesive bonding in trouser waistband applications, using only the waistband nonwoven fabric and SEBS material for lamination. This technology will bring benefits such as cost savings, breathability, and softness.

[0046] Based on the characteristics of SEBS, the SEBS formulation can be adjusted according to the required tension of the waistband, including tension, elasticity and viscosity, to achieve a customized effect, no longer limited by the tension and elasticity requirements of the raw materials.

[0047] The waistline of trousers plays a crucial role in the wearing comfort of the garment. Therefore, the wearing comfort of trousers can be defined using the waistline elasticity fit index. In this invention, the waistline elasticity fit index K (%) is defined as the ratio of the width (denoted as a) of the uppermost part of the product's abdomen, composed of waistline elastomers (including but not limited to elastic bands, rubber bands, elastic membranes, SEBS polymers, etc.) and nonwoven fabric, to the overall waistline width (denoted as b), K = a / b × 100%.

[0048] A suitable waist elasticity index can bring the following advantages to the product in terms of usability:

[0049] 1. To fulfill the functionality of the waist area, providing sufficient waist elasticity and lifting trousers that have absorbed enough liquid.

[0050] 2. It has a good appearance and feel.

[0051] 3. It offers good value for money, but an excessively wide waistline would increase costs.

[0052] 4. It is highly practical, but an excessively wide waistline could pose potential manufacturing challenges.

[0053] It can also be further refined as follows:

[0054] 1) Front waist circumference fit index K1: K1 = a / b × 100%, ranging from 5% to 25%.

[0055] 2) Back waist fit index K2, K2 = a / c × 100%, range is 3%-20% (front and back waist widths are the same, both are a)

[0056] Secondly, the present invention provides a disposable trouser product, comprising a front waistband and a back waistband, the disposable trouser product further comprising:

[0057] An absorbent assembly extending longitudinally between the front waist region and the back waist region, and including an inner layer facing the wearer, an outer layer facing away from the wearer, and an absorbent structure disposed between the inner layer and the outer layer; and

[0058] A waistband assembly, attached to the absorbent assembly and defining the waist opening of the trousers.

[0059] The waistband assembly comprises the elastic composite material of the present invention, or is formed from the elastic composite material of the present invention.

[0060] In a preferred embodiment, the front waistband has a first edge portion that is distributed generally along the longitudinal direction of the trousers and located at the lateral end of the front waistband; the back waistband has a second edge portion that is distributed generally along the longitudinal direction of the trousers and located at the lateral end of the back waistband.

[0061] In a preferred embodiment, the disposable trousers product is assembled from open, one-piece molded trouser panels, and further includes:

[0062] The side seal is configured to be formed by bending the first edge portion and / or the second edge portion along the transverse direction of the trouser piece to overlap and join with each other;

[0063] The side seal remains substantially horizontal relative to the front waistband or the back waistband, thereby connecting the front waistband to the back waistband to form a closed disposable trouser product.

[0064] In a preferred embodiment, the disposable trousers product further includes a crotch area located between the front waist area and the back waist area.

[0065] In a preferred embodiment, the edge seal is configured such that at least one of the first edge portions overlaps the second edge portion on the clothing-facing side and / or at least one of the second edge portions overlaps the first edge portion on the clothing-facing side.

[0066] In a preferred embodiment, the side seal defines a stacking area, and the first edge portion and the second edge portion have generally rectangular fitting portions on the surfaces of the stacking area opposite to each other for forming a side seal that fits perfectly against each other.

[0067] In a preferred embodiment, the edge seal defines a stacking area, and the first edge portion and the second edge portion are partially provided on the surfaces of the stacking area opposite each other for forming a fitting portion of the edge seal that partially fits against each other.

[0068] In a preferred embodiment, the disposable trousers product has a plurality of bonding portions for forming a partial fit of the side seal, wherein the bonding portions are configured in a wavy stripe structure and the plurality of bonding portions are equidistantly spaced along the longitudinal direction.

[0069] In a preferred embodiment, the disposable trousers product has a plurality of bonding portions for forming a partial fit of the side seal, wherein the bonding portions are configured in a horizontal stripe structure and the plurality of bonding portions are equidistantly spaced along the longitudinal direction.

[0070] In a preferred embodiment, the disposable trousers product has a plurality of bonding portions for forming a partial fit of the side seal, wherein the bonding portions are configured in a dotted structure and are evenly distributed in the stacked area.

[0071] In a preferred embodiment, the side seal has a length ranging from 130 mm to 180 mm along the longitudinal direction of the trouser piece.

[0072] In a preferred embodiment, the side seal has a width ranging from 10 mm to 15 mm in the transverse direction of the trouser piece.

[0073] In a preferred embodiment, the width of the bonding portion along the lateral direction is in the range of 10 mm to 12 mm.

[0074] The present invention has the following beneficial effects:

[0075] The use of the elastic composite material of this invention to prepare the waistband of trousers can improve the comfort and fit of adult trousers, reduce waist marks and redness, reduce the amount of hot melt adhesive used in the waistband, reduce odor, lower costs, simplify the production process, and is environmentally friendly. The elastic composite material of this invention uses micro-elastic nonwoven fabric, which makes the waistband nonwoven fabric soft and lightweight. The micro-elastic nonwoven fabric of this invention (approximately 20-50 gsm, with appropriate addition of elastic materials) has the feel of woven fabric, ensuring performance while also possessing good softness and drape, and is relatively thin, which is beneficial for breathability.

[0076] The trousers of this invention feature an invisible side seal design, enhancing both appearance and wearer comfort. Attached Figure Description

[0077] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein:

[0078] Figure 1 shows a schematic diagram of the nonwoven fabric CD direction 1.5 times recovery rate test method of the present invention;

[0079] Figure 2 shows a schematic diagram of a hollow, glue-free design for a waistband elastic band according to a specific embodiment of the present invention;

[0080] Figure 3 shows a physical image of a hollow, glue-free design for a waistband elastic band according to a specific embodiment of the present invention.

[0081] Figure 4 shows a detailed view of the side seal position of the hollow glue-free design of the waistband elastic band in a specific embodiment of the present invention;

[0082] Figure 5 shows a schematic diagram of the combination of a waist elastic band (or SEBS copolymer) and a micro-elastic nonwoven fabric in a specific embodiment of the present invention;

[0083] Figure 6 shows the definitions of the waist fit index for each size as defined in this invention;

[0084] Figure 7 shows a photograph of the trousers product prepared according to Example 3 of the present invention;

[0085] Figure 8 shows a photograph of the trousers product prepared according to Example 4 of the present invention.

[0086] Figure 9 shows a process flow diagram of the preparation of microelastic nonwoven fabric in Embodiment 1 of the present invention;

[0087] Figure 10 shows actual photos of four trouser products during market research for Embodiment 6 of the present invention;

[0088] Figure 11 shows a front view of a disposable trouser product according to a specific embodiment of the present invention;

[0089] Figure 12 shows a rear view of a disposable trouser product according to a specific embodiment of the present invention;

[0090] Figure 13 is a flat view of one embodiment of the trouser piece of the disposable trouser product provided by the present invention, wherein the trouser product is in an open state;

[0091] Figure 14 is an assembled view of the pant piece of the disposable trouser product provided by the present invention, wherein the trouser product is in a closed state, and the second edge portions are all stacked on the first edge portions and cover the first edge portions.

[0092] Figure 15 is an assembled view of the pant piece of the disposable trouser product provided by the present invention, wherein the trouser product is in a closed state, and the first edge portion is stacked on the second edge portion and covers the second edge portion.

[0093] Figure 16 is an assembled view of the pant piece of the disposable trouser product provided by the present invention, wherein the trouser product is in a closed state and the first edge portion is stacked on the second edge portion (facing the garment side).

[0094] Figure 17 is an assembled view of the pant piece of the disposable trouser product provided by the present invention, wherein the trouser product is in a closed state and the second edge portions are all stacked on the first edge portions (facing the garment side);

[0095] Figure 18 is an assembled view of the pant piece of the disposable trouser product provided by the present invention, wherein the trouser product is in a closed state and one of the first edge portions is stacked on a second edge portion.

[0096] Figure 19 is an assembled view of the pant piece of the disposable trouser product provided by the present invention, wherein the trouser product is in a closed state;

[0097] Figure 20 is a partial enlarged view of the side seal of the disposable trousers product shown in Figure 13;

[0098] Figure 21 is a flat view of another embodiment of the trouser piece of the disposable trouser product provided by the present invention, wherein the trouser product is in an open state;

[0099] Figure 22 is a partial enlarged view of the side seal of the disposable trousers product shown in Figure 21;

[0100] Figure 23 is a flat view of another embodiment of the disposable trousers product provided by the present invention, wherein the trousers product is in an open state;

[0101] Figure 24 is a schematic diagram of the disposable trousers product provided by the present invention in the wearing state, wherein the trousers product is in a closed state;

[0102] Explanation of reference numerals in the attached figures:

[0103] 1-Disposable trousers; 10-Pants piece; 12-Front waistband; 120-First edge; 14-Back waistband; 140-Second edge; 16-Side seal; 160-Folding area; 162-Fitting part; 18-Crotch area. Detailed Implementation

[0104] The present invention will be further described in detail below with reference to specific embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0105] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “upper,” “lower,” and other directional terms, shall be understood to have their normal meaning and refer to those directions involved when normally viewing the drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0106] The terms “first,” “first,” “second,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0107] definition

[0108] The terms “disposable” or “reusable” are used herein to describe absorbent articles that are not typically intended to be washed or otherwise restored to or reused as absorbent articles (e.g., they are designed to be discarded after a single use and may also be configured to be recyclable, compostable, or disposed of in other environmentally compatible ways). The absorbent pants described herein are examples of disposable absorbent articles.

[0109] The term "pants product" (also known as "absorbent pants," "pants-style diapers," and "over-the-shoulder diapers") refers herein to a disposable absorbent article designed for adult wearer, having a continuous perimeter waist opening and side-opposite continuous perimeter leg openings. For the avoidance of confusion, adult incontinence articles can be in the form of absorbent pants. Pants may be constructed to have a continuous or closed waist opening, such as a package, and at least one continuous closed leg opening before the wearer puts on the article. Pants may be pre-formed using a variety of techniques, including but not limited to using any re-fastening closure and / or permanent closure (e.g., stitching, thermal bonding, pressure welding, adhesives, glue bonding, mechanical fasteners, etc.) to join the parts of the article together. Pants may be pre-formed at any location around the waist area of ​​the article (e.g., side-fastening or seam-sealed, front waist-fastening or seam-sealed, back waist-fastening or seam-sealed, or combinations thereof).

[0110] Regarding structural terminology, the terms “set up” or “equipped” are used herein to indicate that one or more elements are located in a particular place or position as part of a macroscopic overall structure with other elements or as separate elements joined to another element.

[0111] As used herein, the term "joint" includes a configuration in which an element is directly secured to another element by directly attaching the element to the other element, and a configuration in which an element is indirectly secured to another element by attaching the element to an intermediate member (which in turn is attached to the other element).

[0112] As used herein, regarding directional terminology, for trousers arranged in an open configuration on a horizontal, flat surface, "longitudinal" refers to a direction approximately perpendicular to a line tangent to each of the left and right leg opening edges, where those edges are closest to the front waistband edge. For trousers arranged in an assembled configuration with the front waistband facing upwards on a horizontal, flat surface, "longitudinal" refers to a direction approximately perpendicular to a line tangent to each of the left and right leg opening edges, where those edges are closest to the front waistband edge. "Length" refers to the dimension measured along the longitudinal direction.

[0113] Regarding trousers in an open configuration laid flat on a horizontal surface, "lateral" refers to a direction roughly parallel to a line tangent to each of the left and right leg opening edges, where those edges are closest to the front waistband edge. Regarding trousers in an assembled configuration laid flat on a horizontal surface with the front waistband facing upwards, "lateral" refers to a direction roughly parallel to a line tangent to each of the left and right leg opening edges, where those edges are closest to the front waistband edge. "Width" refers to the dimension measured in the lateral direction.

[0114] As used herein, “integral” means a configuration in which an element is generated from or derived from a component or part of an article, as opposed to an element being joined to a component. “Integral formation” means generating an element from an underlying material or part thereof by, for example, molding, forming, and / or remodeling the underlying material.

[0115] Regarding the material terminology used herein, the terms "nonwoven fabric," "non-woven textile," or "nonwoven material" refer to materials made from continuous (long) filaments (fibers) and / or discontinuous (short) filaments (fibers) using methods such as spunbond, meltblown, carding, etc. In some configurations, nonwoven fabrics may include polyolefin-based nonwoven fabrics, including but not limited to nonwoven fabrics having polypropylene fibers and / or polyethylene fibers and / or bicomponent fibers containing polyolefins. Non-limiting examples of suitable fibers include spunbond, spunbond, meltblown, spunmelt, solvent spinning, electrospinning, carding, membrane fibrillation, melt-film fibrillation, air-blown, dry-laid, wet-laid short fibers, and other nonwoven fiber web materials formed partially or entirely from polymer fibers as known in the art, and feasible combinations thereof. Nonwoven materials do not have woven filaments or braided filament patterns. It should be understood that nonwoven fabrics with various basis weights can be used according to the methods described herein. In various embodiments, the bicomponent fibers of the nonwoven material may contain additives configured to be more sensitive to heating, such as by infrared radiation, which can help, for example, preheating or other heating of the nonwoven material as described herein.

[0116] "Facing the body" and "facing the clothing" refer to the relative positions of components or the relative positions of the surfaces of a component or group of components, respectively. "Facing the body" means that during wear, a component or surface is closer to the wearer than some other components or surfaces. "Facing the clothing" means that during wear, a component or surface is further away from the wearer than some other components or surfaces (i.e., the component or surface is closer to the wearer's clothing, which may be worn over a disposable absorbent material).

[0117] The terms “elongable material,” “ductile material,” or “stretchable material” are used interchangeably and refer to materials that, when a biased force is applied, can be stretched to at least about 110% of their relaxed initial length (i.e., stretched to more than 10% of their initial length) without breaking or fracturing, and exhibit minimal recovery upon release of the applied force, i.e., recovery less than about 20% of their elongation without completely breaking or fracturing, the recovery being measured by EDANA method 20.2-89. In cases where such an elongable material recovers at least 40% of its elongation upon release of the applied force, the elongable material will be considered “elastic” or “elastomer.” For example, an elastic material with an initial length of 100 mm can stretch to at least 150 mm and retract to a length of at least 130 mm upon removal of the force (i.e., exhibiting 40% recovery). In cases where the material recovers less than 40% of its elongation upon release of the applied force, the elongable material will be considered “substantially inelastic” or “substantially non-elastic.” For example, an elongated material with an initial length of 100 mm can be stretched to at least 150 mm and shrink back to a length of at least 145 mm when the force is removed (i.e., exhibiting 10% recovery).

[0118] As used herein, the term "bonding" refers to the joining, adhesion, connection, attachment, etc., of two components. When they are joined, adhered, connected, attached, etc., directly or indirectly to each other, such as when bonded to an intermediate component, the two components are considered bonded together. Bonding can be performed via, for example, adhesives, pressure bonding, thermal bonding, ultrasonic bonding, splicing, stitching, and / or welding.

[0119] The term "opening" refers to the initial separation of opposite waist areas before or during the wearing of an article, thus not forming a continuous waist and leg opening.

[0120] The term "closure" refers to the permanent or repeatable secure joining of opposing waist areas during encapsulation to form a continuous waist opening and leg opening.

[0121] In this document, the terms “approximately” or “generally” mean that the parameters or values ​​used do not need to be implemented precisely, and deviations or variations (which include, for example, tolerances, measurement errors, measurement accuracy limitations, and other factors known to those skilled in the art) may occur in an aggregate that does not impede the desired effect provided by the described features.

[0122] Example

[0123] Example 1

[0124] Preparation of microelastic nonwoven fabric

[0125] This microelastic nonwoven fabric was produced by Suzhou Duorou New Material Technology Co., Ltd., and the preparation process is the same as that of conventional spunbond nonwoven fabric (please refer to Figure 9 for the process flow diagram). The difference is that the microelastic nonwoven fabric of this invention contains the following components by weight:

[0126] 50% polypropylene, 47.5% elastomer (VISTAMAXX) TM PERFORMANCE polymer (purchased from ExxonMobil), 1.5% white masterbatch (POLYWHITE 80608SP WHI masterbatch, purchased from LyondellBasell Advanced Materials (Changshu) Co., Ltd.), and 1% soft masterbatch (GH002 masterbatch, purchased from Foshan Baole Import & Export Trading Co., Ltd.).

[0127] Performance testing of micro-elastic nonwoven fabric

[0128] 1. Tensile strength and elongation of micro-elastic nonwoven fabric

[0129] 1) Connect the power supply, prepare the tensile tester, and suitable load cells and clamps.

[0130] 2) Adjust equipment settings

[0131] 3) Sample preparation

[0132] 4) Place the sample symmetrically in the fixture and close the clamps.

[0133] 5) Start the tension meter. When the return limit is reached, the clamp will automatically return.

[0134] 6) Record the MD / CD tensile strength (N / 2 inch) and MD / CD elongation (%), retaining two decimal places.

[0135] 7) After the experiment, clean the experimental table.

[0136] 8) Test data:

[0137] Table 1

[0138]

[0139]

[0140] In Table 1, “Kimberly’s standard elastic waistband” refers to the waistband of trousers made of 100% elastic film composite; “standard elastic band” refers to Lycra elastic band; “inner and outer nonwoven fabric” refers to the inner and outer nonwoven fabrics that make up the waistband of the trousers. In this embodiment, the nonwoven fabric is purchased from Yanjiang supplier.

[0141] 2. Breathability of micro-elastic nonwoven fabric

[0142] 1) Connect the power supply, turn on the testing instrument, and preheat for 5 minutes to allow the pressure sensor to stabilize.

[0143] 2) Sample preparation

[0144] 3) Remove the rubber sheet and reset the settings.

[0145] 4) Lay the sample flat under the clamping handle and press down the clamping handle until the vacuum pump starts automatically.

[0146] 5) As the numbers displayed on the digital display gradually increase until they stabilize, the value displayed on the display is the air permeability value of the sample.

[0147] 6) Press down the clamping handle, the sample is released, and the vacuum pump is turned off.

[0148] 7) Record the test data, keeping it to the nearest whole number.

[0149] 8) After the experiment, clean the experimental table.

[0150] 9) Test data:

[0151] Table 2

[0152] Waistband Design Example 1: Standard elastic band + inner and outer non-woven fabric. Kimberly-Clark standard elastic waistband breathability value (ft) 3 / ft 2 / min)727490269 surface

[0153] In Table 2, “Kimberly-Clark’s standard elastic waistband” refers to the waistband of trousers made of 100% elastic film composite; “standard elastic band” refers to Lycra elastic band; “inner and outer nonwoven fabric” refers to the inner and outer nonwoven fabrics that make up the waistband of the trousers. In this embodiment, the nonwoven fabric is purchased from Yanjiang supplier.

[0154] Example 2

[0155] Preparation of elastic composite materials

[0156] Elastic composite materials were prepared using the micro-elastic nonwoven fabric and elastic band (SAB webbing) obtained in Example 1. The SAB webbing was purchased from Guangdong Weixing Fengli Webbing Co., Ltd., and the elastic band contained the following components by weight: 85% polyester and 15% spandex filaments; the width of the elastic band was 20 mm; and the elastic recovery rate of the elastic band was 160%.

[0157] The elastic composite material of this embodiment was prepared by the following process steps:

[0158] 1. The micro-elastic nonwoven fabric is stretched and laid flat during the operation of the main machine through the non-elastic nonwoven fabric unwinding system;

[0159] 2. The elastic band is stretched to 180% (for example) stretch ratio using the elastic band unwinding system, and the material is fed into the main machine;

[0160] 3. Using a transmission system and a positioning system, and with the help of a video recognition system, the elastic band is positioned on the micro-elastic nonwoven fabric at a suitable location using hot melt adhesive;

[0161] 4. By using a folding plate, the non-woven fabric is folded over and covered, so that both the top and bottom sides of the elastic band are covered with non-woven fabric;

[0162] 5. The two components work together as a whole, moving forward with the main unit and eventually combining with other components to form a complete trouser product.

[0163] Performance testing of elastic composite materials

[0164] 1. Maximum waist tension, average tension, and single-point tension (when stretched 300mm)

[0165] 1) Fold the test product in half and place it on the clamp of the tensile tester, then zero the data.

[0166] 2) Open the waist section of the product and slip it between the upper and lower clamps.

[0167] 3) Start the tensile testing program and input information such as the product width in the relaxed state into the program.

[0168] 4) The clamp is activated to perform tensile displacement.

[0169] 5) After the clamp returns to its initial position, record the maximum tension (unit: gf), average tension (unit: gf), and single-point tension (unit: kN).

[0170] 6) Record the test data, keeping it to the nearest whole number (for single-point tension, keep it to three decimal places).

[0171] 7) After the experiment, clean the experimental table.

[0172] 8) Test data:

[0173] Table 3

[0174] Waistband Design Example 2: Conventional elastic band + inner and outer non-woven fabric. Maximum tension (unit: gf): 19721434. Average tension (unit: gf): 471393. Single-point tension (when stretched 300mm, unit: kN): 0.0190.014 surface

[0175] In Table 3, "conventional elastic band" refers to Lycra elastic band; "inner and outer non-woven fabric" refers to the non-woven fabric on the inner and outer sides of the waistband of the trousers. In this embodiment, the non-woven fabric is purchased from Yanjiang supplier.

[0176] 2. Maximum load-bearing weight test for elastic bands of different widths (product weight + urine weight)

[0177] 1) Wear trousers made of elastic bands of different widths onto the doll model and mark the initial position of the waistband.

[0178] 2) Inject the aqueous solution into the injection point inside the product to simulate the weight of urine.

[0179] 3) Continue injecting liquid until the product falls off, i.e., if it deviates from its original position by more than 10cm, then stop injecting liquid.

[0180] 4) At this point, the elastic band can withstand the weight of the product plus the weight of the injected aqueous solution (urine).

[0181] 5) Record data, accurate to one decimal place.

[0182] 6) After the experiment, clean the experimental table.

[0183] 7) Test results:

[0184] Table 4

[0185] Width (mm) Product Weight (g) Urine Weight (g) Total Weight (g) 537.5 165 202.5 1038.1 400 438.1 2038.6 650 688.6 2538.1 745 783.1 surface

[0186] 1. Table 4 shows that when the elastic band width is greater than 10mm, it can withstand the product after injecting urine according to the national standard liquid volume. Therefore, the width of the elastic band needs to be greater than or equal to 10mm.

[0187] 2. At the same time, considering factors such as appearance, feel, and cost, it is not recommended that the width of the elastic band exceed 50mm.

[0188] Therefore, in this invention, the width of the elastic band is preferably 10-50 mm.

[0189] Example 3

[0190] Preparation of elastic composite materials

[0191] Elastic composite materials (hybrids) were prepared using the microelastic nonwoven fabric obtained in Example 1 and the SEBS copolymer. The SEBS copolymer was purchased from Shanghai Fangtian Elastomer Co., Ltd., and the density of SEBS was 0.96 g / cm³. 3 .

[0192] The elastic composite material of this embodiment was prepared by the following process steps:

[0193] 1. The micro-elastic nonwoven fabric is stretched and laid flat during the operation of the main machine through the non-elastic nonwoven fabric unwinding system;

[0194] 2. The SEBS copolymer is extruded using a SEBS extrusion device, and the material is then fed into the main unit;

[0195] 3. In the process of SEBS from extrusion to composite with micro-elastic nonwoven fabric, the SEBS copolymer is gradually stretched to 180% stretch ratio (distance) by changing the drive traction ratio of the active roller.

[0196] 4. Using a transmission system and a positioning system, and with the aid of a video recognition system, the SEBS copolymer is pulled and transferred to its appropriate position on the micro-elastic nonwoven fabric;

[0197] 5. By using a folding plate, the non-woven fabric is folded over and covered, so that both the upper and lower surfaces of the SEBS copolymer are covered with non-woven fabric;

[0198] 6. The two components work together as a whole, moving forward with the main unit and eventually combining with other components to form a complete trouser product.

[0199] Performance testing of elastic composite materials

[0200] 1. Maximum waist tension, average tension, and single-point tension (when stretched 400mm)

[0201] 1) Fold the test product in half and place it on the clamp of the tensile tester, then zero the data.

[0202] 2) Open the waist section of the product and slip it between the upper and lower clamps.

[0203] 3) Start the tensile testing program and input information such as the product width in the relaxed state into the program.

[0204] 4) The clamp is activated to perform tensile displacement.

[0205] 5) After the clamp returns to its initial position, record the maximum tension (unit: gf), average tension (unit: gf), and single-point tension (unit: kN).

[0206] 6) Record the test data, keeping it to the nearest whole number (for single-point tension, keep it to three decimal places).

[0207] 7) After the experiment, clean the experimental table.

[0208] 8) Test data:

[0209] Table 5

[0210] Waistband Design Example 3: Conventional elastic band + inner and outer non-woven fabric. Maximum tension (unit: gf): 23342797. Average tension (unit: gf): 349716. Single-point tension (when stretched 400mm, unit: kN): 0.0230.028 surface

[0211] In Table 5, "conventional elastic band" refers to Lycra elastic band; "inner and outer non-woven fabric" refers to the non-woven fabric on the inner and outer sides of the waistband of the trousers. In this embodiment, the non-woven fabric is purchased from Yanjiang supplier.

[0212] Example 4

[0213] Preparation of trouser products

[0214] The elastic composite material obtained in Example 2 was used to prepare trouser products.

[0215] 1. At the pre-process station of the main unit, the absorbent core and the anti-leakage part of the trousers are assembled according to the process flow;

[0216] 2. At the waist-band fabrication station of the main unit, complete the production of the above embodiment 2;

[0217] 3. After completion, the absorbent core and the anti-leakage part are combined with the elastic composite material of Example 2 in the subsequent work station to produce the final complete trouser product.

[0218] 4. Trousers are first put into bags, then into boxes, and finally into the warehouse.

[0219] The actual product of the trousers prepared in this embodiment is shown in Figure 8, where the left image of Figure 8 does not contain the absorbent layer, and the right image does contain the absorbent layer.

[0220] When manufacturing trouser products, the side sealing design of this invention can be implemented with reference to the technical solution described below.

[0221] Figure 13 is a flat view of an embodiment of the disposable trousers product provided by the present invention, wherein the trousers product is in an open state. Referring to Figure 13, the disposable trousers product shown in the figure is assembled from one-piece molded trousers, and the trousers product formed after assembly is shown in Figures 14 to 19 and Figure 24. The disposable trousers product includes a front waist area 12, a back waist area 14, and a crotch area 18 arranged between the front waist area 12 and the back waist area 14.

[0222] The front waistband 12 and back waistband 14, facing the wearer or towards the body (i.e., the inner waistband), are optionally made of nonwoven fabric, and an elastomer material is optionally disposed in the front waistband 12 and / or back waistband 14. The front waistband 12 and back waistband 14, facing away from the wearer or towards the garment (i.e., the outer waistband), are optionally bonded to the corresponding inner waistband, for example, by adhesive bonding, to form a waistband composite layer, thereby obtaining the front waistband 12 and back waistband 14 of the trousers. Of course, those skilled in the art will understand that this disposable trousers can also be made using other corresponding material structures and processes. The crotch area 18 optionally includes an absorbent layer made of absorbent material, which may be located only in the crotch area or distributed throughout the entire trousers; this can be designed by those skilled in the art as needed.

[0223] Furthermore, the front waistband 12 has a first edge portion 120, which is distributed at two lateral ends of the front waistband and is distributed along the longitudinal direction of the trouser piece. As shown in FIG13, this longitudinal direction is the length direction of the trouser piece shown in the figure. The back waistband 14 has a second edge portion 140, which is distributed at two lateral ends of the back waistband and is also distributed along the longitudinal direction of the trouser piece.

[0224] Specifically, it also includes a side closure 16, which is configured to be formed by bending the first edge portion 120 and / or the second edge portion 140 along the lateral direction of the trouser piece 10 to overlap and join with each other. Specifically, the side closure 16 can be formed in several ways: at the two lateral ends of the front waistband 12 and the back waistband 14 of the trouser piece, the first edge portion 120 is overlapped on the second edge portion 140; or the second edge portion 140 is overlapped on the first edge portion 120; or alternatively, one of the first edge portions 120 is overlapped on the second edge portion 140, while the other first edge portion 120 is overlapped below the second edge portion 140.

[0225] The side seal obtained through the aforementioned structure remains substantially horizontal relative to the front waistband or the back waistband (see Figure 20 for details), thereby connecting the front waistband to the back waistband to form the disposable trousers product. The term "overlapping" means that one component overlaps or stacks with another. The term "horizontal" can be understood as the side seal forming a substantially smooth transition relative to the trouser piece and remaining approximately on the same horizontal plane as the trouser piece. That is, the "side seal" in this invention does not form a raised ridge.

[0226] Furthermore, in the embodiments shown in this invention, the length of the rear waist area 14 in the lateral direction may be greater than the length of the front waist area 12 in the lateral direction (as shown in FIG14), or the length of the front waist area 12 in the lateral direction may be greater than the length of the rear waist area 14 in the lateral direction (as shown in FIG15), or the lengths of the front waist area 12 and the rear waist area 14 in the lateral direction may be equal (as shown in FIG18 to 19).

[0227] Alternatively, Figure 14 is an assembled view of the pant piece of the disposable trouser product provided by the present invention, wherein the trouser product is in a closed state and the second edge portions are all stacked on the first edge portions. Specifically, as shown in Figure 14, taking the side seal 16 formed by stacking the second edge portions 140 on the first edge portions 120 as an example, when the lateral length of the back waist area 14 is greater than the lateral length of the front waist area 12, the second edge portions 140 are bent towards the first edge portions 120 along the lateral direction of the pant piece 10 and stacked on the first edge portions 120 (facing the garment side) to form the side seal 16 defining the stacking area 160. It can also be understood that the second edge portions 140 bend to cover the first edge portions 120, thereby forming the desired side seal 16. Of course, the side seal 16 can also be formed in such a way that the second edge 140 of the rear waist area 14 can be bent toward the first edge 120 and overlapped below the first edge 120 (facing the body side) of the front waist area 120 to form a side seal 16 that defines the overlapping area 160. This can be understood as the first edge 120 covering the bent second edge 140, thereby forming the desired side seal 16.

[0228] Alternatively, as shown in Figure 15, which is an assembled view of the pant piece of the disposable trousers product provided by the present invention, this view is taken from the wearing side of the product when the pant piece is laid flat on a plane for assembly. The figure shows the trousers product in a closed state. As shown, specifically, taking the side seal 16 formed by evenly stacking the first edge portion 120 on the second edge portion 140 as an example, when the lateral length of the front waist area 12 is greater than the lateral length of the back waist area 14, the first edge portion 120 is bent towards the second edge portion 140 along the lateral direction of the pant piece and stacked on the second edge portion 140 (facing the garment side) to form the side seal 16 defining the stacking area 160. It can also be understood that the first edge portion 120 bends to cover the second edge portion 140, thereby forming the desired side seal 16. Of course, the side seal can also be formed in such a way that the first edge 120 of the front waist area 120 can be bent toward the second edge 140 of the rear waist area 14 and overlapped below the second edge 140 of the rear waist area 140 (facing the body) to form a side seal 16 defining the overlapping area 160. This can be understood as the second edge 140 covering the bent first edge 120, thereby forming the desired side seal 16.

[0229] Additionally, when the lateral length of the front waist area 12 is equal to the lateral length of the rear waist area 14, the first edge portion 120 and the second edge portion 140 can be simultaneously bent toward each other and stacked together to form the side seal 16 (not shown in the figure).

[0230] Alternatively, Figures 18 and 19 are assembled views of the pant pieces of the disposable trousers product provided by the present invention. These views are taken from the wearing side of the product when the pant pieces are laid flat on a plane for assembly, and the figures show the trousers product in a closed state.

[0231] In Figures 18 and 19, one of the first edges 120 of the front waist area 12 bends toward a corresponding second edge 140 of the rear waist area 14 and overlaps below the second edge 140 (facing the body side), while the other second edge 140 of the rear waist area 14 bends toward the other first edge 120 of the front waist area 12 and overlaps below the first edge 120 (facing the body side). Alternatively, in an alternative implementation, one of the first edges 120 of the front waistband 12 is bent toward and overlaps a second edge 140 of the back waistband 14 (facing the garment side), while covering the second edge. The other second edge 140 of the back waistband 14 is bent toward and overlaps another first edge 120 of the front waistband 12 (facing the garment side), while covering the first edge 120. The corresponding edges are then joined together by adhesive bonding to form the edge seal 16, an example of which is not shown in the figure.

[0232] Disposable trousers with the aforementioned side seal of this invention can improve the wearer's wearing experience, enhance the product's aesthetics, and eliminate the inconvenience of being bulky and cumbersome. Furthermore, because the disposable trousers have the aforementioned side seal, the trousers can perfectly conform to the wearer's skin curves at the seal point, effectively improving the problem of traditional side seals leaving marks on the wearer's waistline, while also enhancing the wearer's comfort.

[0233] Figure 20 is a partially enlarged view of the side seal of the disposable trousers product shown in Figure 13. The side seal 16 shown in Figure 20 is formed by uniformly applying adhesive to the opposing surfaces of the stacking area 160 of the first edge portion 120 and the second edge portion 140, resulting in a completely bonded side seal 16. In the stacking area 160 of the side seal 16, a bonding portion 162 is partially provided on the opposing surfaces of the first edge portion 120 and the second edge portion 140 to form a complete bond between them. This bonding portion 162 can be constructed as a generally rectangular structure. The term "complete bond" means that the first edge portion 120 and the second edge portion 140 achieve complete surface-to-face contact through, for example, adhesive bonding, without any separation between them. The adhesive bonding method employed in this invention helps maintain the structural stability of the side seal and avoids undesirable insufficient strength.

[0234] Regarding the joining methods mentioned above, those skilled in the art will understand that adhesive bonding or gluing is the preferred joining method for achieving the joining of the first edge portion 120 and the second edge portion 140. When the side seal 16 is formed by adhesive bonding, the resulting side seal 16 is more skin-friendly.

[0235] Referring again to Figure 20, the side seal 16 has a length d1 along the longitudinal direction of the trouser piece, wherein the length d1 is in the range of 130 mm to 180 mm. The side seal 16 also has a width d2 along the transverse direction of the trouser piece 10, wherein the width d2 is in the range of 10 mm to 15 mm.

[0236] Figure 21 is a flat view of another embodiment of the trouser piece 10 of the disposable trouser product 1 provided by the present invention. The structure of this trouser product is generally the same as that of the trouser product shown in Figure 13, with the main difference being the edge seal 16. The edge seal 16 shown in Figure 13 is a completely fitted edge seal where the first edge portion 120 and the second edge portion 140 are fully bonded, while the edge seal 16 shown in Figure 21 is a partially bonded edge seal where the first edge portion 120 and the second edge portion 140 are partially bonded. This edge seal 16 defines a stacking area 160, and the first edge portion 120 and the second edge portion 140 are partially provided with bonding portions 162 on the opposing surfaces of the stacking area 160 for forming a partial bond between them. The term "partial bond" refers to a bonding method in which the first edge portion 120 and the second edge portion 140 achieve partial surface contact in the stacking area through, for example, adhesive bonding. The bonded and unbonded portions can, for example, be alternately distributed, and this arrangement can avoid undesirable excessive strength.

[0237] Figure 22 is a partially enlarged view of the side seal 16 of the disposable trouser product 1 shown in Figure 21. As shown in Figure 22, in this embodiment, the first edge portion 120 and the second edge portion 140 form a side seal 16 that is partially bonded to each other by locally and uniformly applying adhesive to the surfaces of the overlapping areas opposite each other. The partially bonded side seal 16 has a plurality of bonding portions 162, each bonding portion 160 in the side seal 16 can be configured as a horizontal stripe structure (see Figure 22), each horizontal stripe-shaped bonding portion 162 extending in the transverse direction of the side seal 16 and spaced apart from each other in the longitudinal direction of the trouser piece 10 by a certain distance, preferably wherein each spacing distance is equal. That is, the plurality of horizontal stripe-shaped bonding portions 162 of the side seal 16 are distributed at equal intervals in the longitudinal direction (e.g., similar to the structure of Venetian blinds). In the edge seal 16 formed by the partial bonding of the first edge portion 120 and the second edge portion 140 mentioned above, the bonding portion 162 has a width d3 in the lateral direction, which can be less than d2, and the width d3 can be in the range of 10 mm to 12 mm for example.

[0238] Alternatively or additionally, each adhesive portion 162 of the aforementioned side seal 16 can also be constructed as a wavy stripe structure. Each wavy stripe adhesive portion 162 extends in the transverse direction of the side seal 16 and is spaced apart from each other in the longitudinal direction of the trouser piece 10, preferably with equal spacing. That is, the plurality of wavy stripe adhesive portions 162 of the aforementioned side seal 16 are equidistantly distributed in the longitudinal direction. The spacing between each of the aforementioned horizontal stripe and wavy stripe adhesive portions 162 is preferably between 2 and 8 mm. In the case where adhesive is partially applied to the first edge portion 120 and the second edge portion 140, the total area of ​​the adhesive portion 162 (or adhesive portion) can account for 12% to 50% of the total area of ​​the side seal.

[0239] Alternatively or additionally, each of the aforementioned edge-sealing adhesive portions 162 can also be constructed as a dotted structure. Each dotted adhesive portion 162 is spaced apart in the transverse direction of the edge-sealing and also spaced apart in the longitudinal direction of the trouser piece; preferably, the interval between each is equal. That is, the plurality of dotted adhesive portions 162 of the aforementioned edge-sealing are equidistantly spaced along the longitudinal and / or transverse directions. The dotted adhesive portions 162 can be collinearly distributed in the transverse and / or longitudinal directions. Specifically, the dotted structure of each adhesive portion 162 can be triangular, circular, quadrilateral, elliptical, etc. Those skilled in the art, guided by the present invention, can also conceive of other alternative dotted structures.

[0240] Figure 23 is a flat view of another embodiment of the trouser piece 10 of the disposable trouser product 1 provided by the present invention. As shown, except for the difference in length between the front waistband 12 and the back waistband 14 in the lateral direction, the trouser piece 10 shown in Figure 23 may have the same structure (especially the side seam) as the trouser piece 10 shown in Figure 13 or Figure 21.

[0241] Figure 24 is a schematic diagram of the disposable trousers product provided by the present invention in the wearing state. Specifically, the view within the box in the figure shows the state of the side seal 16 of the disposable trousers product 1 in the wearing state. As shown, the side seal 16 is generally horizontal with respect to the waist area (i.e., the part jointly defined by the front waist area 12 and the back waist area 14 after the product is assembled), especially the circumferential surface of the waist area, and does not form a convex ridge that protrudes radially relative to the circumferential surface of the waist area.

[0242] This invention provides a disposable trouser product that improves the product's aesthetics through a novel structural design and allows the trousers to perfectly conform to the wearer's skin curves at the edge, thereby effectively improving the problem of traditional edge sealing leaving marks on the wearer's waist. It also improves the wearer's comfort and avoids the possibility of the product being unsuitable in terms of strength.

[0243] Example 5

[0244] Preparation of trouser products

[0245] The elastic composite material obtained in Example 3 was used to prepare trouser products.

[0246] 1. At the pre-process station of the main unit, the absorbent core and the anti-leakage part of the trousers are assembled according to the process flow;

[0247] 2. At the waist-band fabrication station of the main unit, complete the production of the above embodiment 3;

[0248] 3. After completion, the absorbent core and the anti-leakage part are combined with the elastic composite material of Example 3 in the subsequent work station to produce the final complete trouser product.

[0249] 4. Trousers are first put into bags, then into boxes, and finally into the warehouse.

[0250] In this embodiment, the side sealing design of the trousers product can be implemented with reference to the technical solution described in Embodiment 4.

[0251] Example 6

[0252] Market research

[0253] On November 7th and 9th, 2023, Kimberly-Clark China, in conjunction with a third-party market research company, conducted four focus group discussions (FGD), recruiting 16 consumers (including those aged 45-55 and 55-65 who currently use diapers and pantsuits, and those who do not). Evaluations were based on dimensions such as the design of disposable pantsuits, waistband material, leak-proof design, core and shape, visual appeal, and surface material. Figure 10 shows photos of the four pantsuits used in the market research. Table 6 details the specific findings of this market research.

[0254] Table 6

[0255]

[0256] Consumer surveys and seminars revealed that the product (A4) prepared in Example 5 of this invention was widely favored by all participants. The product (A4) prepared in this invention, in terms of its shape design, the fit of the legs to the body, the choice of materials, and the waistband design, is far superior to Kimberly-Clark's current conventional elastic-based waistband materials and elastic membrane-based waistband materials. It is even more popular with consumers than the most popular ultra-fine, ultra-dense elastic bands on the market. The waistband of the product (A4) prepared in this invention does not have elastic; instead, it uses elastic bands for waist shaping, making it more like a real underwear design. The material is softer and feels more like real underwear.

Claims

1. A disposable trouser product, comprising a front waistband and a back waistband, the disposable trouser product further comprising: An absorbent assembly extending longitudinally between the front waistband and the back waistband, and including an inner layer facing the wearer, an outer layer facing away from the wearer, and an absorbent structure disposed between the inner and outer layers; and a waistband assembly attached to the absorbent assembly and defining a waist opening of the trousers, wherein the disposable trousers are assembled from an open, one-piece trouser panel; the front waistband has a first edge portion distributed along the longitudinal direction of the trouser panel and located at a lateral end of the front waistband; the back waistband has a second edge portion distributed along the longitudinal direction of the trouser panel and located at a lateral end of the back waistband; the disposable trousers further include: a side seal configured to be formed by bending the first edge portion and / or the second edge portion along the lateral direction of the trouser panel to overlap and engage with each other; The side seal remains substantially horizontal relative to the front waistband or the back waistband, thereby connecting the front waistband to the back waistband to form a closed disposable trouser product; the waistband assembly comprises or is formed of an elastic composite material; the elastic composite material comprises: a micro-elastic nonwoven fabric, and an elastic layer disposed adjacent to the micro-elastic nonwoven fabric; wherein the micro-elastic nonwoven fabric comprises, by weight, the following components: 45-55% polypropylene, 42-52% elastomer, 1-2% white masterbatch, and 0.5-1.5% soft masterbatch; the elastic layer is an elastic band comprising polyester and spandex filaments and the width of the elastic band is 10-50 mm; or the elastic layer is composed of or contains SEBS copolymer and the elastic layer acts as an adhesive to bond itself to the micro-elastic nonwoven fabric to form the elastic composite material.

2. The disposable trousers product according to claim 1, wherein, The elastomer is a fiber elastomer.

3. The disposable trousers product according to claim 1, wherein, The elastomer is a polyurethane elastomer fiber.

4. The disposable trousers product according to claim 1, wherein, The elastomer is selected from one or both of VISTAMAXX™ PERFORMANCE polymer and Lycra polymer.

5. The disposable trousers product according to claim 1, wherein, The white masterbatch is made of polypropylene or polyester polymer.

6. The disposable trousers product according to claim 1, wherein, The soft masterbatch is made of epoxidized polyamide, polyurethane elastomer, polyol and stearic acid.

7. The disposable trousers product according to claim 1, wherein, The elastic band comprises, by weight, the following components: 75%-95% polyester and 5%-25% spandex.

8. The disposable trousers product according to claim 1, wherein, The elastic band has an elastic recovery rate of 120%-250%.

9. The disposable trousers product according to claim 1, wherein, When the elastic layer is composed of or contains SEBS copolymer, the elastic layer is a continuous layer or a discontinuous layer.

10. The disposable trousers product according to claim 9, wherein, The elastic composite material has longitudinal and transverse dimensions, and the elastic layer includes a plurality of adhesive elastic strips oriented longitudinally or transversely, and the plurality of adhesive elastic strips are spaced apart from each other in the transverse or longitudinal direction.

11. The disposable trousers product according to claim 1, wherein, The density of the SEBS copolymer is 0.88-0.96 g / cm³. 3 .

12. The disposable trousers product according to claim 11, wherein, The density of the SEBS copolymer is 0.96 g / cm³. 3 .

13. The disposable trousers product according to claim 1, wherein, When the elastic layer is composed of or contains SEBS copolymer, the basis weight of the elastic layer is 60 g / m² or lower.

14. The disposable trousers product according to claim 13, wherein, The basis weight of the elastic layer is 48-50 grams per square meter.

15. The disposable trousers product according to claim 1, wherein, The disposable trousers product also includes a crotch area, which is located between the front waist area and the back waist area.

16. The disposable trousers product according to claim 1, wherein, The edge seal is configured such that at least one of the first edge portions overlaps the second edge portion on the clothing-facing side and / or at least one of the second edge portions overlaps the first edge portion on the clothing-facing side.

17. The disposable trousers product according to claim 1, wherein, The edge seal defines a stacking area, and the first edge portion and the second edge portion have rectangular fitting portions on the surfaces of the stacking area that are opposite to each other, for forming a completely fitted edge seal.

18. The disposable trousers product according to claim 1, wherein, The edge seal defines a stacking area, and the first edge portion and the second edge portion are partially provided on the surfaces of the stacking area opposite each other for forming a fitting portion of the edge seal that partially fits against each other.

19. The disposable trousers product according to claim 18, wherein, The disposable trousers product has a plurality of bonding portions for forming a partial fit of the side seal, wherein the bonding portions are configured in a wavy stripe structure and the plurality of bonding portions are equidistantly spaced along the longitudinal direction.

20. The disposable trousers product according to claim 18, wherein, The disposable trousers product has a plurality of bonding portions for forming a partial fit of the side seal, wherein the bonding portions are configured in a horizontal stripe structure and the plurality of bonding portions are equidistantly distributed along the longitudinal direction.

21. The disposable trousers product according to claim 18, wherein, The disposable trousers product has a plurality of bonding portions for forming a partial fit of the side seal, wherein the bonding portions are configured in a dotted structure and are evenly distributed in the stacked area.

22. The disposable trousers product according to claim 1, wherein, The side seal has a length ranging from 130 mm to 180 mm along the longitudinal direction of the trouser piece.

23. The disposable trousers product according to claim 1, wherein, The side seal has a width ranging from 10 mm to 15 mm in the transverse direction of the trouser piece.

24. The disposable trousers product according to any one of claims 19-21, wherein, The width of the bonding portion along the lateral direction is in the range of 10 mm to 12 mm.

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