An absorbent article employing a mesh fabric structure and a production process thereof

Abstract

The present disclosure provides an absorbent article with a mesh fabric structure, comprising an absorbent body for absorbing liquid, a front waistband and a back waistband, the front waistband is arranged at one end of the absorbent body, and the back waistband is arranged at the other end of the absorbent body, and the front waistband and the back waistband are both provided with an outer layer, an elastic layer and an inner layer. By using the weaving mesh structure of "first elastic thread + S-shaped first non-woven thread", the traditional "strip-shaped elasticity" is converted into "planar elasticity", the elastic force is uniformly distributed in the whole waistband area, compared with the existing spandex thread-non-woven fabric composite structure, the mesh fabric has obvious advantages, under the premise of ensuring that the elastic performance does not decrease, the softness of the overall composite structure is greatly improved, and the wearing comfort is better; at the same time, the mesh fabric is integrally woven and formed, and a large number of spandex thread independent unwinding devices are not required during production, the risk of spandex thread material breakage stoppage is significantly reduced, and the production stability and efficiency are improved.

Description

Technical Field

[0001] This disclosure relates to the field of pull-up pants manufacturing, and in particular to an absorbent product with a mesh fabric structure and its manufacturing process. Background Technology

[0002] Pull-up diapers, as an important category of disposable hygiene products, are widely used by infants, incontinent individuals, and other groups due to their ease of wear, close fit, and high degree of freedom of movement. As consumers increasingly demand comfort and safety in hygiene products, core performance indicators of pull-up diapers, such as elasticity, breathability, and the absence of marks, have become key areas of research and development for the industry.

[0003] Currently, most mainstream pull-up diapers on the market rely primarily on elastic bands for their elastic structure. These bands are typically spaced out in areas such as the waistband and leak-proof sides, allowing for a comfortable fit for different body types. However, existing pull-up diapers have some shortcomings in their elastic band structure, mainly in uneven elastic stretching. Traditional elastic bands are linear strips arranged in parallel at intervals around the waistband and other areas. When worn, the elastic force is concentrated in the extension area of ​​each elastic band, with almost no elastic contraction in the non-woven fabric area between adjacent bands. This "point-like" or "strip-like" elastic distribution results in uneven tension, affecting wearing comfort.

[0004] Specifically, existing elastic band pull-up pants have the following problems in actual use: First, the concentrated distribution of elastic force leads to excessive local pressure, which is especially problematic for infants with delicate skin or incontinent individuals with special body shapes. This can easily cause marks on the waist, groin, and other areas, and may even cause skin allergies, redness, and swelling. Second, the inelastic areas between adjacent elastic bands are prone to wrinkling when worn, which affects the fit of the pull-up pants to the body. Summary of the Invention

[0005] This disclosure provides an absorbent article with a mesh fabric structure and its manufacturing process, so as to at least solve the above-mentioned technical problems existing in the prior art.

[0006] According to a first aspect of this disclosure, an absorbent article employing a mesh fabric structure is provided, comprising an absorbent body for absorbing liquid; The front waistband and the back waistband are provided. The front waistband is located at one end of the absorbent body and the back waistband is located at the other end of the absorbent body. Both the front waistband and the back waistband are provided with an outer layer, an elastic layer and an inner layer. The elastic layer includes, The first elastic stock line, there are multiple first elastic stock lines, and the multiple first elastic stock lines are arranged along a first direction; The first nonwoven thread is located between adjacent first elastic strands. The first nonwoven thread is interwoven and wound around the adjacent first elastic strands. The first nonwoven thread extends in an S-shaped bend along the second direction between the adjacent first elastic strands. The first nonwoven thread and the first elastic strands are woven together to form a mesh fabric structure.

[0007] Furthermore, the first elastic strand is made of spandex fiber with a thickness of 20 denier to 800 denier, and the spacing between two adjacent first elastic strands is 1 to 5 mm; the first nonwoven thread is made of polypropylene or polyester fiber, with the peak spacing of the S-shaped structure being 1 to 10 mm and the trough depth being 0.5 to 5 mm.

[0008] Furthermore, the first nonwoven yarn forms continuous braided nodes by interlacing and winding in an S-shape between two adjacent first elastic strands. The spacing between adjacent braided nodes is 0.5-5mm, and the number of turns of the first nonwoven yarn and the first elastic strand at the braided node is 1-2 turns.

[0009] Furthermore, the peaks and troughs of adjacent first nonwoven yarns are opposite, and the peaks and troughs of adjacent first nonwoven yarns are staggered along the length direction of the first elastic strand.

[0010] Furthermore, the elastic layer is fixed between the outer layer and the inner layer by ultrasonic waves.

[0011] Furthermore, the front waistband and the rear waistband are ultrasonically pressed together at their edges.

[0012] A processing method for an absorbent product made of mesh fabric includes the following steps: S1. Multiple first elastic strands are laid out parallel to each other along the first direction, and the laying tension is controlled to be 5-15N. At the same time, the first non-woven thread is laid out along the second direction. The first non-woven thread is interwoven and wound in an S-shape between two adjacent first elastic strands through a weaving mechanism. After weaving, an elastic layer semi-finished product is obtained. The elastic layer semi-finished product is pre-stretched and then naturally recovers to obtain the finished elastic mesh fabric. S2. The initial finished elastic mesh fabric is unwound using a material unwinding device at a speed of 10-150 m / min. After unwinding, the mesh fabric is introduced into a storage device, and the mesh fabric is pre-stretched a second time using the storage device. The pre-stretch rate is 30%-50%, and the pre-stretch time is 1-3 seconds. Subsequently, the mesh fabric is subjected to a tension stabilization control, with a tension value of 4-8 N. S3. The elastic layer after secondary stretching and shaping is cut by a CNC slitting machine to divide the elastic layer into two parts along the first direction with a slitting accuracy of ±2mm. S4. The two parts of the elastic layer after splitting are stretched for the third time. The third stretching rate is 10%-30%. During the stretching process, the tension is kept stable at 8-20N to obtain the finished elastic layer. S5: Select non-woven fabric as the substrate for the outer and inner layers, and perform static elimination treatment on it; S6: Apply adhesive to the bonding surface of the outer layer using a hot melt adhesive applicator. The amount of adhesive applied is controlled at 5-15g / m². The application method is spraying. S7: Align and bond the non-woven fabric and elastic layer of the outer and inner layers after applying adhesive, and then cure and bond them by hot pressing to obtain the composite waistband substrate. S8: The absorbent core is bonded and fixed with the breathable bottom membrane to obtain the crotch substrate; S9: Align and laminate the composite waistband substrate with the crotch substrate, cut out the outline shape of the pull-up pants using a cutting device, perform ultrasonic heat pressing on both sides, and then cut to obtain the finished pull-up pants.

[0013] Furthermore, in step S7, the hot pressing process parameters are: hot pressing temperature 120-160℃, hot pressing pressure 0.3-0.8MPa, hot pressing time 5-20ms, and the surface of the hot pressing roller is provided with concave and convex textures with a texture depth of 0.1-0.3mm and a texture spacing of 1-2mm.

[0014] Compared to existing technologies, the pull-up pants with a mesh fabric structure and their manufacturing process disclosed in this application have the following advantages: This application transforms the traditional "strip elasticity" into "sheet elasticity" through a woven mesh structure of "first elastic strand + S-shaped first non-woven thread". The elastic force is evenly distributed throughout the waist area. Compared with the existing spandex-non-woven composite structure, the mesh fabric of this invention has significant advantages. While ensuring that the elastic performance does not decrease, it greatly improves the softness of the overall composite structure and provides better wearing comfort. At the same time, the mesh fabric is woven as a whole, eliminating the need for a large number of independent unwinding devices for spandex yarn during production. This significantly reduces the risk of production stoppage due to spandex yarn shortage and improves production stability and efficiency.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0017] Figure 1 A schematic diagram of the overall structure of this disclosure is shown; Figure 2 A sectional view of the front waist structure of this disclosure is shown; Figure 3 A schematic diagram of the elastic layer structure of this disclosure is shown; Figure 4 A comparison diagram of the waist circumference of the mesh fabric disclosed herein is shown; Figure 5 A comparison diagram of the breathability of the front of the pull-up diapers using mesh fabric is shown in this disclosure; Figure 6 A comparison diagram showing the side breathability of pull-up trousers using mesh fabric in this disclosure is shown.

[0018] Explanation of the labels in the diagram: 100. Front waist circumference; 200. Back waist circumference; 300. Absorbing subject; 400. Outer layer; 500, Inner Layer; 600, Elastic layer; 610, First elastic strand; 620, First nonwoven thread. Detailed Implementation

[0019] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0020] Example 1 Pull-up diapers, as an important category of disposable hygiene products, are widely used by infants, incontinent individuals, and other groups due to their ease of wear, close fit, and high degree of freedom of movement. As consumers increasingly demand comfort and safety in hygiene products, core performance indicators of pull-up diapers, such as elasticity, breathability, and the absence of marks, have become key areas of research and development for the industry.

[0021] Currently, most mainstream pull-up diapers on the market rely primarily on elastic bands for their elastic structure. These bands are typically spaced out in areas such as the waistband and leak-proof sides, allowing for a comfortable fit for different body types. However, existing pull-up diapers have some shortcomings in their elastic band structure, mainly in uneven elastic stretching. Traditional elastic bands are linear strips arranged in parallel at intervals around the waistband and other areas. When worn, the elastic force is concentrated in the extension area of ​​each elastic band, with almost no elastic contraction in the non-woven fabric area between adjacent bands. This "point-like" or "strip-like" elastic distribution results in uneven tension, affecting wearing comfort.

[0022] Specifically, existing elastic band pull-up pants have the following problems in actual use: First, the concentrated distribution of elastic force leads to excessive local pressure, which is especially problematic for infants with delicate skin or incontinent individuals with special body shapes. This can easily cause marks on the waist, groin, and other areas, and may even cause skin allergies, redness, and swelling. Second, the inelastic areas between adjacent elastic bands are prone to wrinkling when worn, which affects the fit of the pull-up pants to the body.

[0023] Meanwhile, in the production process of the elastic waistband, the elastic band needs to be coated with adhesive first, and then a layer of non-woven fabric is sprayed with adhesive. The elastic band is fixed by bonding the two layers of non-woven fabric. This process has significant shortcomings: on the one hand, in order to ensure the reliability of the elastic band's fixation, a large amount of adhesive needs to be applied, and the bonding requirements of the two layers of non-woven fabric result in the composite elastic waistband feeling too stiff, seriously affecting wearing comfort; on the other hand, the online production of elastic bands requires a large number of unwinding devices, each corresponding to the unwinding of one spandex filament, which greatly increases the probability of material breakage and machine shutdown, reduces production efficiency, and increases the difficulty of production control.

[0024] Please see Figure 1 and Figure 2 To address the aforementioned technical problems, this application designs an absorbent product with a mesh fabric structure, including an absorbent body 300. The absorbent body 300 is used to quickly absorb and retain liquids such as urine and body fluids to prevent leakage. The absorbent body 300 includes a breathable bottom membrane, an absorbent core, and a flow guiding layer. The absorbent core is composed of dust-free paper, fluff pulp, and superabsorbent polymer (SAP) to ensure high absorption capacity and water-locking performance.

[0025] Please see Figure 2The front waist circumference 100 and the back waist circumference 200 are fixedly set at one end of the absorbent body 300 and the back waist circumference 200 is fixedly set at the other end of the absorbent body 300. The front waist circumference 100 and the back waist circumference 200 together form a wearing cavity to fit the contour of the human waist. Both the front waist circumference 100 and the back waist circumference 200 adopt a three-layer composite structure of "outer layer 400 - elastic layer 600 - inner layer 500". The three-layer structure works together to achieve the functions of "support, elasticity and skin-friendly".

[0026] Outer layer 400: Made of hot-air nonwoven fabric or spunbond nonwoven fabric with a basis weight of 15-30 g / m², it has good tensile strength and flexibility, and is used to provide structural support while blocking external dust and impurities from entering. Inner layer 500: Made of skin-friendly hot-air non-woven fabric with a weight of 18-35g / m², the surface is treated with napping, and the coefficient of friction is ≤0.3, which improves the skin-friendly feel and reduces friction damage to the skin; Elastic layer 600 (core innovative structure): It is set between the outer layer 400 and the inner layer 500. It is an integral mesh fabric structure that replaces the traditional strip elastic rubber band.

[0027] Please see Figure 2 and Figure 3 The elastic layer 600 includes: There are multiple first elastic strands 610, and these multiple first elastic strands 610 are arranged along a first direction (i.e., the length direction of the pull-up pants). Figure 1 The first elastic strands 610 are arranged in parallel and uniform vertical directions to provide core elastic recovery force for the elastic layer 600. The material of the first elastic strand 610 is spandex fiber, with a thickness ranging from 20 denier to 800 denier. Spandex fiber was chosen as the material for the first elastic strand 610 because it has excellent elastic recovery properties, meeting the requirement for rapid recovery after repeated stretching of the pull-up diaper. The wire diameter is set to 0.1-0.3mm, ensuring sufficient elastic force while avoiding discomfort caused by excessively thick wires. The spacing between adjacent first elastic strands 610 is controlled at 1-5mm to ensure uniform elastic distribution. Too small a spacing increases material costs, while too large a spacing fails to effectively cover the elastic force.

[0028] The first nonwoven thread 620 is located between adjacent first elastic strands 610. The first nonwoven thread 620 is interwoven and wound around the adjacent first elastic strands 610. The first nonwoven thread 620 bends in an S-shape between the adjacent first elastic strands 610 along the second direction (i.e., the width direction of the pull-up pants). Figure 1The elastic layer 600 extends laterally (within the middle layer) and forms an integral mesh fabric structure through the weaving of the first nonwoven yarn 620 and the first elastic strand 610, achieving a uniform planar distribution of elastic force. The first nonwoven yarn 620 is made of polypropylene or polyester fiber, with an S-shaped structure having a peak spacing of 1-10 mm and a trough depth of 0.5-5 mm. Polypropylene or polyester fiber has good flexibility and strength, making it suitable as the material for the first nonwoven yarn 620. The setting of its S-shaped structure's peak spacing and trough depth parameters enables the first nonwoven yarn 620 to work synergistically with the first elastic strand 610 during stretching, further improving the stretching uniformity of the elastic layer 600.

[0029] The first nonwoven yarn 620 forms continuous braided nodes by interlacing and winding in an S-shape between two adjacent first elastic strands 610. The spacing between adjacent braided nodes is 0.5-5mm, and the number of turns of the first nonwoven yarn 620 and the first elastic strand 610 at the braided node is 1-2 turns. The continuous braided nodes enhance the connection stability between the first elastic strand 610 and the first nonwoven yarn 620, preventing yarn breakage and fraying during stretching.

[0030] The crests and troughs of adjacent first nonwoven yarns 620 are opposite, and the crests and troughs of adjacent first nonwoven yarns 620 are staggered along the length direction of the first elastic strand 610. This staggered distribution allows the forces on adjacent first nonwoven yarns 620 to complement each other when the elastic layer 600 is stretched, further improving the uniformity of the elastic distribution and avoiding localized stress concentration.

[0031] The elastic layer 600 is fixed between the outer layer 400 and the inner layer 500 by ultrasonic waves, hot melt adhesive, or hot pressing. Several ultrasonic bonding points are formed on both the elastic layer 600 and the outer layer 400 and the inner layer 500. Ultrasonic fixing has advantages such as fast bonding speed, high bonding strength, and minimal material damage, ensuring a reliable connection between the elastic layer 600 and the outer layer 400 and the inner layer 500. The presence of several ultrasonic bonding points ensures connection stability while preserving the stretching space of the elastic layer 600, preventing a decrease in elasticity due to complete bonding.

[0032] The front waistband 100 and the back waistband 200 are ultrasonically pressed together at their edges. This hot-pressing connection method creates a sealed structure between the edges of the front waistband 100 and the back waistband 200, improving leak-proof performance while ensuring connection strength and preventing cracking during wear.

[0033] The outer layer 400, elastic layer 600, and inner layer 500 can also be bonded together with hot melt adhesive. Adhesive bonding can serve as an auxiliary connection method for ultrasonic fixation, further enhancing the connection stability between the three components and ensuring that the structural integrity is maintained even after repeated stretching.

[0034] The hot melt adhesive used is Nanbao 8209, with a glue tank temperature of 150℃, a hose temperature of 150℃, a glue gun temperature of 160℃, and a glue gun hot air temperature of 160℃. The melting point is 80-120℃, and the viscosity is 1000-3000 mPa·s (at 150℃). The thickness of the hot melt adhesive is 0.1-0.2mm. It has good adhesion and elasticity, able to adapt to the stretching and shrinking of the elastic layer 600, preventing breakage of the hot melt adhesive during the stretching process of the elastic layer 600, and ensuring a strong bond. Simultaneously, this hot melt adhesive has good breathability, will not clog the ventilation holes of the inner 500 mesh fabric, ensuring the breathability of the pull-up diapers, and has no irritating odor, making it skin-friendly and suitable for infants and people with sensitive skin.

[0035] The advantages of using hot melt adhesive for fixing are: First, it has a wide bonding range, enabling full adhesion between the elastic layer 600 and the inner and outer layers 400, with uniform bonding strength, avoiding localized delamination; second, the hot melt adhesive has good elasticity, allowing it to deform with the stretching and shrinking of the elastic layer 600 without affecting its elasticity, ensuring the pull-up pants fit well; third, the hot melt adhesive leaves no residue after curing, will not irritate the wearer's skin, and has good water resistance, preventing the pull-up pants from delaminating during use.

[0036] Figure 4 The comparison chart shows that the mesh fabric waistband of this invention (mesh section waistband) exhibits significantly lower maximum force values ​​after one and two stretches compared to ordinary waistbands, offline fine denier waistbands, and online fine denier waistbands. This indicates that the mesh section waistband has lower tensile resistance, making it easier and more comfortable to wear without causing excessive pressure on the wearer's waist. Simultaneously, the elastic recovery rate of the mesh section waistband reaches 95.51%, comparable to online fine denier waistbands, and slightly lower than ordinary and offline fine denier waistbands. However, it still meets the elastic recovery requirements of the pull-up pants waistband, ensuring a good fit throughout the wearing process and preventing problems such as loosening or leakage due to insufficient elastic recovery.

[0037] in Figure 5 This is a comparison chart of the breathability of this product with other products. The breathability test results show that: Among them, the mesh fabric waistband product (HF new product) has significantly better front breathability than all the comparison products, with a test value of 18.14, which is the highest value among the four groups of products. Compared to the second-best performing bare-feel pull-up diapers (14.90), the new product using mesh fabric shows an approximately 21.7% improvement in front breathability; Compared to the Flower Bud series (10.83), which has the lowest breathability, the new product using mesh fabric has a 67.5% improvement in front breathability; Compared to Lion Kingdom (13.45), the new product using mesh fabric saw an increase of approximately 34.9%.

[0038] Analysis of the cause: Existing products use elastic bands / fine denier elastic bands, which typically require a dense arrangement of multiple elastic bands in the waist area to achieve elasticity. These elastic bands are themselves a dense, elastic material, and their arrangement creates a large area of ​​obstruction, severely hindering airflow and resulting in poor breathability in the front. The elastic mesh fabric structure used in this application is a woven mesh structure that provides sufficient elastic support while creating numerous continuous airflow channels through the mesh gaps. This eliminates the need for a dense arrangement of elastic bands to achieve waist elasticity, significantly reducing airflow obstruction and thus substantially improving front breathability.

[0039] in Figure 6 This chart compares the side breathability of this product with other products. The side breathability test results show that: The new product using mesh fabric (HF new product) also has the best side breathability among the four products, with a test value of 1920, which is significantly higher than other products. Compared to the second-best performing Lion Kingdom (1904), the new product using mesh fabric showed an improvement of approximately 0.84% ​​in side breathability; Compared to the bare-feel pull-up diapers (1893), the new product using mesh fabric showed an improvement of approximately 1.43%; Compared to the Flower Bud series (1418), which has the lowest breathability, the new product using mesh fabric has improved by up to 35.4%.

[0040] Analysis of the reasons: The side of the pull-up diaper is the area where the waistband connects to the body of the diaper. The elastic band structure of existing products will also form dense obstruction in this area, affecting the air circulation on the side. However, the elastic mesh fabric structure of this application also retains a complete mesh ventilation channel in the side area, which not only ensures the elastic fit of the waistband on the side, but also avoids the obstruction of airflow by the elastic band. Therefore, the side breathability is also leading.

[0041] Meanwhile, a comparison of the test data from the front and sides shows that the breathability of the sides of existing products is much higher than that of the front. The main reason is that the front is the main area with densely packed elastic bands, which severely obstructs the airflow. However, the product of this application solves the breathability bottlenecks of both the front and sides through a mesh fabric structure, achieving uniform high breathability throughout the entire waist area.

[0042] Example 2 To achieve the industrial production of the aforementioned mesh bralette pants, a specialized processing technology was designed. This technology, through "multiple stretching and shaping + precise tension control + targeted bonding," ensures the stability of the mesh fabric's elasticity and reliable bonding with the non-woven fabric. The specific steps are as follows: S1: Multiple first elastic strands 610 are laid out parallel to each other along a first direction, with the laying tension controlled at 5-15N. Simultaneously, first nonwoven yarn 620 is laid out along a second direction. Through a weaving mechanism, the first nonwoven yarn 620 is interwoven and wound in an S-shape between adjacent first elastic strands 610. After weaving, a semi-finished elastic layer 600 is obtained. The semi-finished elastic layer 600 is pre-stretched and then naturally recovers to obtain the finished elastic mesh fabric. Controlling the laying tension at 5-15N ensures that the first elastic strands 610 and the first nonwoven yarn 620 remain straight during weaving, avoiding bending or loosening, and ensuring weaving accuracy. The pre-stretching treatment eliminates internal stress in the semi-finished elastic layer 600, improves elastic recovery performance, and ensures the elastic uniformity of the finished elastic mesh fabric.

[0043] S2. The initial finished elastic mesh fabric is unwound using a material unwinding device at a speed of 10-30 m / min. After unwinding, the mesh fabric is introduced into a storage device for secondary pre-stretching. The secondary pre-stretching rate is 30%-50%, and the pre-stretching time is 1-3 seconds. Subsequently, the mesh fabric undergoes primary tension stabilization control, with a tension value of 4-8 N. Setting the unwinding speed to 10-30 m / min balances production efficiency and product quality. Controlling the secondary pre-stretching rate at 30%-50% further optimizes the elastic properties of the elastic mesh fabric, and the pre-stretching time of 1-3 seconds ensures sufficient stretching. Primary tension stabilization control ensures the mesh fabric remains stable during subsequent processing, preventing uneven stretching.

[0044] S3. The elastic layer 600, after secondary stretching and shaping, is slit by a CNC slitting machine, dividing it into two parts along the first direction with a slitting accuracy of ±2mm. The CNC slitting machine has the advantages of high slitting accuracy and good stability. Controlling the slitting accuracy within ±2mm ensures that the dimensions of the slit elastic layer 600 meet design requirements, laying the foundation for subsequent bonding with other materials. The slitting machine is a commonly used piece of equipment in this field.

[0045] S4. The two parts of the split elastic layer 600 are subjected to a third stretching, with a stretching rate of 10%-30%. During the stretching process, the tension is kept stable at 8-20N to obtain the finished elastic layer 600. The third stretching can precisely adjust the elastic properties of the elastic layer 600 according to the actual product requirements, and can avoid damage or uneven stretching of the elastic layer 600 during the stretching process.

[0046] S5: Select non-woven fabric as the base material for the outer layer 400 and the inner layer 500, and perform static elimination treatment on it. Static elimination treatment can prevent the non-woven fabric from attracting dust and impurities due to static electricity during processing, ensuring product cleanliness.

[0047] S6: Apply adhesive to the bonding surface of the elastic layer 600 using a hot melt adhesive applicator. The amount of adhesive applied should be controlled at 5-15 g / m², and the application method should be spraying. Controlling the amount of adhesive applied at 5-15 g / m² ensures bonding strength while avoiding material waste and reduced air permeability due to excessive application. Dot or line application methods preserve the stretching space of the elastic layer 600. Preheating treatment improves the fluidity of the hot melt adhesive and enhances the bonding effect.

[0048] S7: Align and bond the pre-treated outer layer 400 and inner layer 500 nonwoven fabric with the adhesive-coated elastic layer 600, then cure and bond using hot pressing or ultrasonic roller hot pressing to obtain the composite waistband substrate. Alignment and bonding ensure precise positioning of each layer, while hot pressing or ultrasonic roller hot pressing enables rapid curing and bonding, guaranteeing the structural stability and elasticity of the composite waistband substrate.

[0049] S8: Fluff pulp, superabsorbent polymer (SAP), and dust-free paper are combined and embossed to form an absorbent core. This core is then bonded to a breathable bottom membrane to create the crotch area substrate. Fluff pulp has excellent liquid absorption properties, SAP quickly absorbs and locks in liquid, the embossing process enhances the structural stability of the absorbent core, and the breathable bottom membrane improves the breathability of the crotch area, preventing stuffiness.

[0050] S9: Align and laminate the composite waistband substrate with the crotch substrate, then cut out the outline shape of the pull-up trousers using a cutting device. Fold and fix the leak-proof edges on both sides to obtain the finished pull-up trousers. Alignment and lamination ensure the overall structure of the pull-up trousers is precise, the cutting device has high cutting accuracy, and folding and fixing enhances the leak-proof performance of the leak-proof edges.

[0051] In step S4, the hot pressing process parameters are: hot pressing temperature 120-160℃, hot pressing pressure 0.3-0.8MPa, hot pressing time 2-5s. The surface of the hot pressing roller has a textured surface with a texture depth of 0.1-0.3mm and a texture spacing of 1-2mm. The upper roller temperature and the lower roller temperature are both 120℃. The optimized settings of the hot pressing temperature, pressure, and time parameters ensure that the hot melt adhesive is fully melted and cured, achieving reliable bonding of each layer of material. The textured surface of the hot pressing roller increases the bonding area, further improving the bonding strength, while avoiding excessive compression of the elastic layer 600, thus ensuring elastic performance.

[0052] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An absorbent product employing a mesh fabric structure, characterized in that, Includes an absorbent body (300) for absorbing liquid; The front waist (100) and the back waist (200) are provided. The front waist (100) is located at one end of the absorbent body (300), and the back waist (200) is located at the other end of the absorbent body (300). Both the front waist (100) and the back waist (200) are provided with an outer layer (400), an elastic layer (600) and an inner layer (500). The elastic layer (600) includes, There are multiple first elastic strands (610), and the multiple first elastic strands (610) are arranged along a first direction; The first nonwoven thread (620) is located between adjacent first elastic strands (610). The first nonwoven thread (620) is interwoven and wound around the adjacent first elastic strands (610). The first nonwoven thread (620) extends in an S-shaped bend along the second direction between the adjacent first elastic strands (610). The first nonwoven thread (620) and the first elastic strands (610) are woven to form a mesh fabric structure.

2. The absorbent product with a mesh fabric structure according to claim 1, characterized in that, The first elastic strand (610) is made of spandex fiber with a thickness of 20 denier to 800 denier, and the spacing between two adjacent first elastic strands (610) is 1 to 5 mm; the first nonwoven thread (620) is made of polypropylene or polyester fiber, and the peak spacing of the S-shaped structure is 1 to 10 mm, and the trough depth is 0.5 to 5 mm.

3. The absorbent product with a mesh fabric structure according to claim 1, characterized in that, The first nonwoven thread (620) forms a continuous braided node by interweaving and winding in an S-shape between two adjacent first elastic strands (610). The distance between adjacent braided nodes is 0.5-5mm, and the number of turns of the first nonwoven thread (620) and the first elastic strand (610) at the braided node is 1-2 turns.

4. The absorbent product with a mesh fabric structure according to claim 1, characterized in that, The peaks and troughs of adjacent first nonwoven yarns (620) are opposite, and the peaks and troughs of adjacent first nonwoven yarns (620) are staggered along the length direction of the first elastic strand (610).

5. The absorbent product with a mesh fabric structure according to claim 1, characterized in that, The elastic layer (600) is fixed between the outer layer (400) and the inner layer (500) by ultrasonic waves.

6. The absorbent product with a mesh fabric structure according to claim 1, characterized in that, The front waistband (100) and the rear waistband (200) are ultrasonically pressed together at their edges.

7. A processing method for absorbent products made of mesh fabric, used to process absorbent products using any one of claims 1-6 that employ a mesh fabric structure, characterized in that, Includes the following steps: S1. Multiple first elastic strands (610) are laid out parallel to each other in the first direction, and the laying tension is controlled to be 5-15N. At the same time, the first non-woven thread (620) is laid out in the second direction. The first non-woven thread (620) is interwoven and wound in an S-shape between two adjacent first elastic strands (610) by a weaving mechanism. After weaving, an elastic layer (600) semi-finished product is obtained. The elastic layer (600) semi-finished product is pre-stretched and then naturally recovers to obtain the finished elastic mesh fabric. S2. The initial finished elastic mesh fabric is unwound using a material unwinding device at a speed of 10-150 m / min. After unwinding, the mesh fabric is introduced into a storage device, and the mesh fabric is pre-stretched a second time using the storage device. The pre-stretch rate is 30%-50%, and the pre-stretch time is 1-3 seconds. Subsequently, the mesh fabric is subjected to a tension stabilization control, with a tension value of 4-8 N. S3. The elastic layer (600) after secondary stretching and shaping is cut by a CNC slitting machine to divide the elastic layer (600) into two parts along the first direction with a slitting accuracy of ±2mm. S4. The two parts of the elastic layer (600) after being cut and split are stretched for the third time. The third stretching rate is 10%-30%. During the stretching process, the tension is kept stable at 8-20N to obtain the finished elastic layer (600). S5: Select non-woven fabric as the substrate for the outer layer (400) and the inner layer (500), and perform static elimination treatment on it; S6: Apply adhesive to the bonding surface of the outer layer (400) using a hot melt adhesive applicator. The amount of adhesive applied is controlled to be 5-15 g / m². The application method is spraying. S7: Align and bond the non-woven fabric of the outer layer (400) and inner layer (500) with the elastic layer (600) after applying adhesive, and then use hot pressing to cure and bond them to obtain the composite waistband substrate. S8: The absorbent core is bonded and fixed with the breathable bottom membrane to obtain the crotch substrate; S9: Align and laminate the composite waistband substrate with the crotch substrate, cut out the outline shape of the pull-up pants using a cutting device, perform ultrasonic heat pressing on both sides, and then cut to obtain the finished pull-up pants.

8. The processing technology of the absorbent product using mesh fabric according to claim 7, characterized in that: In step S7, the hot pressing process parameters are: hot pressing temperature 120-160℃, hot pressing pressure 0.3-0.8MPa, hot pressing time 5-20ms, and the surface of the hot pressing roller is provided with concave and convex textures with a texture depth of 0.1-0.3mm and a texture spacing of 1-2mm.

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