Universal disposable underpants and production process thereof

Abstract

The invention discloses universal disposable underpants and a production process thereof, and belongs to the technical field of disposable underpants, the universal disposable underpants comprise a front piece and a rear piece, the front piece comprises a front waist part, a front telescopic part and a bottom crotch, the rear piece comprises a rear waist part, a rear telescopic part and a hip part, the front piece and the rear piece are connected through the bottom crotch, a lining is further arranged on the inner side of the bottom crotch, and the bottom crotch is connected with the lining. By adopting the high-density fine denier spandex elastic yarn and the regional elastic design, the single caliber of the product can adapt to an extremely wide body type range (covering the sub-size M to XXL and about 67-105 cm waistline), the confusion of a consumer for selecting the size is thoroughly eliminated, meanwhile, the size of the product can be adjusted, and meanwhile, the size of the product can be adjusted to be larger than that of the product, and the size of the product can be adjusted to be larger than that of the product. The low pressure intensity and differential pressure distribution brought by the fine denier filaments can effectively prevent skin indentation, and all-weather and non-inductive close-fitting comfortable experience is provided.

Description

Technical Field

[0001] This invention relates to the field of disposable underwear technology, specifically to a general-purpose disposable underwear and its manufacturing process. Background Technology

[0002] Disposable underwear is made of thin non-woven fabric or single-sided knitted fabric. It is a disposable product that is used once and then discarded. It comes into direct or indirect contact with the human body and is used to achieve the purpose of human physiological hygiene or health care.

[0003] Traditional disposable underwear typically only has elastic structures in the waist and leg areas, while the rest of the area lacks elasticity, resulting in poor overall fit. It is easy for it to shift or fall off during activities. Its elastic components are mostly made of high-fineness (such as 210Dtex or higher) spandex elastic yarns, and the spacing between them is relatively wide, which leads to local pressure concentration. Wearing it for a long time can easily leave pressure marks on the skin and cause discomfort.

[0004] The above-mentioned technical conditions also have shortcomings: traditional disposable underwear needs to be produced in multiple sizes such as S, M, L, XL, XXL, and XXXL, resulting in a complicated product line. This makes it difficult for consumers to choose and increases the inventory and management costs for manufacturers. At the same time, the physiological differences between men and women require different underwear designs, which further increases the number of SKUs.

[0005] Based on this, the present invention designs a universal disposable underwear and its manufacturing process to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a universal disposable underwear and its manufacturing process to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a universal disposable underwear, comprising a front piece and a back piece, wherein the front piece includes a front waistband, a front stretchable portion and a crotch, and the back piece includes a back waistband, a back stretchable portion and a buttocks, the front piece and the back piece are connected by the crotch, and an inner lining is provided on the inner side of the crotch. Side waistbands are provided on both sides of the back waistband and the front waistband, and on both sides of the front stretchable portion and the back stretchable portion. Both the front piece and the back piece are composed of a first layer, a second layer facing one side of the first layer, and multiple slender elastic stretchable structures. The elastic stretchable structures are arranged between the first layer and the second layer in a spaced-apart manner along the stretching direction. Multiple sheet-jointing portions are provided on both the first layer and the second layer. Multiple adhesive blocks are provided between the multiple sheet-jointing portions and the elastic stretchable structures. The multiple adhesive blocks are arranged in a striped pattern that is discontinuous in the length direction of the elastic stretchable structure and continuous in the direction intersecting the elastic stretchable structure.

[0008] By adopting the above technical solution, by setting a first layer, a second layer and multiple elastic stretching structures sandwiched between them, and by using adhesive blocks with specific patterns for bonding, the main body of the underwear has all-round and uniform elasticity. This structure can form regular and beautiful folds when contracted, which greatly improves the fit and visual texture.

[0009] Preferably, the spacing between adjacent elastic telescopic structures is between 0.4 mm and 4 mm.

[0010] By adopting the above technical solution, the high-density arrangement combined with fine denier fibers is the key to achieving uniform low pressure, high elasticity and comfort.

[0011] Preferably, the elongation rate of the front waist and the back waist in the length direction is 250%~350%, the elongation rate of the front telescopic part and the rear telescopic part in the length direction is 150%~250%, and the elongation rate of the buttocks and the crotch in the length direction is 130%~150%.

[0012] By adopting the above technical solution, differentiated pressure mapping is achieved by precisely controlling the thickness, spacing, and pre-stretch rate of spandex elastic yarns in different body areas (waist, hips, and legs).

[0013] Preferably, the elastic stretching structure is a spandex elastic yarn with a thickness of 10~1000 Dtex.

[0014] By adopting the above technical solutions, the application of fine denier fibers (such as 10~340Dtex) can significantly reduce the pressure per unit area on the skin, effectively reducing or even eliminating pressure marks.

[0015] Preferably, the first layer and the second layer are respectively composed of nonwoven fabric or woven fabric.

[0016] By adopting the above technical solutions, low-cost, high-efficiency mechanized production can be achieved, and the material is soft and breathable.

[0017] A manufacturing process for a general-purpose disposable underwear includes the following steps: S1, Elastic Material Composite Process: A first layer and a second layer composed of nonwoven or woven fabric are provided. Multiple long and thin spandex elastic filaments with a thickness of 10~1000 Dtex are used as elastic stretching structures. They are arranged in parallel at intervals of 0.4~4 mm along the stretching direction and sandwiched between the first layer and the second layer. The first layer and the second layer are bonded together intermittently along the length direction of the spandex elastic filaments and continuously in the direction of crossing the spandex elastic filaments to form a sheet joint, thereby obtaining a continuous elastic composite material. S2, Liner bonding process: A liner made of a moisture-absorbing material is provided, and the liner is bonded to a predetermined position corresponding to the bottom area of ​​the elastic composite material obtained in step S1 by spraying an adhesive or hot pressing. S3. Die-cutting and folding process: Using a die-cutting tool, the continuous elastic composite material with the inner lining attached is cut into an unfolded flat pant shape, and then folded in half along the center line of the pant shape; S4. Waist and side sealing and cutting process: The folded pants are welded and sealed at the corresponding sides of the front waist and back waist using ultrasonic welding or hot pressing welding to form the waist and side sealing part. Then, the sealing part is cut along the center line to separate and obtain an independent single disposable underwear product. S5. Folding and Packaging Process: Fold the single disposable underwear into a predetermined shape, put it into a packaging film, vacuum the air out, heat seal and cut it to make an independent sealed packaged product.

[0018] Preferably, in the S1 elastic material composite process, the spandex elastic yarn is pre-stretched during clamping, and the pre-stretch rate is set according to different parts of the underwear: the pre-stretch rate corresponding to the front waist and back waist area is 200%~350%, the pre-stretch rate corresponding to the front stretch part and back stretch part area is 150%~250%, and the pre-stretch rate corresponding to the buttocks and crotch area is 130%~150%.

[0019] Preferably, in the S1 elastic material composite process, the adhesive is applied and transferred onto the first or second layer by a printing roller, and the width of the adhesive pattern on the outer circumferential surface of the printing roller in the circumferential direction is 0.2mm to 4mm, and the circumferential spacing between adjacent adhesive patterns is 2mm to 8mm.

[0020] Preferably, in the S1 elastic material composite process, the amount of adhesive applied is 0.5 g / m² to 8 g / m².

[0021] Preferably, in the S4 waist-side sealing and cutting process, the waist-side sealing part formed by ultrasonic welding or hot-press welding is an intermittent strip or dot pattern of fusion, rather than a continuous fusion, to ensure the flexibility of this part.

[0022] In summary, this application has the following beneficial technical effects: 1. By using high-density fine denier spandex elastic yarn and a zoned elastic design, this product can accommodate an extremely wide range of body types with a single diameter (covering Asian sizes M to XXL, approximately 67~105cm waist circumference), completely eliminating the confusion for consumers when choosing sizes. At the same time, the low pressure and differentiated pressure distribution brought by the fine denier yarn can effectively prevent skin indentations and provide an all-day, imperceptible, close-fitting comfort experience. It is suitable for both men and women and simplifies the product line.

[0023] 2. The unique intermittent-continuous striped adhesive pattern allows the fabric to maintain high peel strength while achieving exceptional softness and rich three-dimensional wrinkled texture. The appearance is close to that of high-end knitted underwear, breaking away from the cheap and simple look of traditional disposable underwear. The high elasticity and good stress retention properties ensure that the product can maintain its initial fit after long-term wear, preventing it from loosening and slipping.

[0024] 3. The product design is fully geared towards automated production lines. From elastic material lamination, inner lining bonding, die-cutting, folding, ultrasonic welding (side sealing) to pillow-type individual packaging, the entire process can be mechanized and continuously operated in a closed manner. This not only significantly improves production efficiency and reduces labor costs, but also maximizes the hygiene and safety of the products. At the same time, the universal design greatly reduces the number of product SKUs, reduces the complexity of inventory management, mold costs, and the types of packaging materials, resulting in significant economic benefits.

[0025] 4. Allow one layer to be made of skin-friendly non-heat-melting material (such as cotton) and the other layer to be made of heat-sealable non-woven fabric, taking into account the comfort of natural materials and the needs of industrial processing. The waist uses ultrasonic or heat-pressed dot / strip sealing, which not only ensures the bonding strength, but also avoids the discomfort of hard lumps caused by traditional stitching or wide heat sealing, thus improving the wearing experience. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the front structure of the underwear in this embodiment; Figure 2 This is a schematic diagram of the back structure of the underwear in this embodiment; Figure 3 This is a schematic diagram of the underwear unfolded in this embodiment; Figure 4 This is a side view of the sheet and elastic telescopic structure in this embodiment; Figure 5 This is a schematic diagram of the waist-side sealing part in this embodiment; Figure 6 This is a schematic diagram of the sheet and elastic stretching structure in this embodiment; Figure 7 Table showing the change in force over time to maintain stability; Figure 8 Asian size chart for men's underwear; Figure 9 Women's underwear size chart; Figure 10 This is a simplified schematic diagram illustrating the principle of the production process in this embodiment.

[0028] The attached diagram lists the components represented by each number as follows: 1. Front telescopic section; 2. Rear telescopic section; 3. Rear waist section; 4. Front waist section; 5. Hips; 6. Crotch; 7. Lining; 8. Waist side sealing section; 11. First layer; 12. Second layer; 13. Elastic telescopic structure; 14. Panel joint; 15. Adhesive block. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0031] A universal disposable underwear includes a front piece and a back piece. The front piece includes a front waistband 4, a front elastic section 1, and a crotch 6. The back piece includes a back waistband 3, a back elastic section 2, and a buttocks 5. The front and back pieces are connected by the crotch 6 to form a complete sheet (see reference). Figure 3 As shown), the back waist 3 and the front waist 4, the front stretch part 1 and the back stretch part 2 are provided with waist side sealing parts 8 on both sides. The connection between the bottom 6 and the waist side sealing parts 8 makes the underwear as a whole. The upper opening formed by the front waist 4 and the back waist 3, and the two lower openings formed by the buttocks 5 and the bottom 6, are used to make the underwear wearable. The front and back pieces are both composed of a first layer 11, a second layer 12 facing one side of the first layer 11, and multiple thin elastic stretch structures 13. The elastic stretch structures 13 are arranged between the first layer 11 and the second layer 12 in a way that is along the stretch direction and spaced apart from each other. The spacing between adjacent elastic stretch structures 13 is between 0.4mm and 4mm, more preferably 0.7mm and 1.5mm. This high-density arrangement combined with fine denier fibers is the key to achieving uniform low pressure, high elasticity and comfort. Multiple sheet-joint portions 14 are provided on both the first layer 11 and the second layer 12. The width L2 of the sheet-joint portion 14 in the stretching direction is preferably 0.2mm to 4mm, and the interval L1 between adjacent sheet-joint portions 14 is preferably 2mm to 8mm. The adhesive pattern within this size range can form pleats of moderate height, neat arrangement and not easy to collapse when elastically shrinking, while ensuring the overall softness of the fabric. Multiple adhesive blocks 15 are provided between the multiple sheet-joint portions 14 and the elastic stretching structure 13. The adhesive blocks 15 are formed by the solidification of adhesive of a specified length. The amount of adhesive applied per unit area is preferably in the range of 0.5g / m² to 8g / m² to ensure the balance between adhesive strength (preferably longitudinal and transverse peel strength are both greater than or equal to 200cN / 25mm) and softness. The multiple adhesive blocks 15 are arranged in a striped pattern that is discontinuous in the length direction of the elastic stretching structure 13 and continuous in the direction intersecting the elastic stretching structure 13.

[0032] Furthermore, the stretching ratio of the front waist 4 and the rear waist 3 in the length direction is 250%~350%, that is, the original length is Figure 3 As shown in Figure A, the front waist section 4 and the back waist section 3 can stretch up to 3.5A in length, exhibiting high extensibility and thus suitable for users with different waist sizes. This ultra-high elongation rate is the core of achieving "universal" design. Figure 8 As shown in the Asian waist circumference size chart, the variation rate of waist circumference from M to XXL (approximately 67~105cm) can reach over 150%. The overall structural tensile potential of this invention exceeds 225%, which is sufficient to cover this range. The spandex elastic yarn used in the waist area is preferably 340dtex~1000dtex in thickness, and the pre-stretch rate during fixing is preferably 200%~300% to provide sufficient wrapping force.

[0033] Furthermore, the elongation rate of the front telescopic part 1 and the rear telescopic part 2 in the length direction is 150%~250%, that is, the original length is Figure 3 As shown in Figure A, the front stretching part 1 and the rear stretching part 2 can be stretched in the length direction of up to 2.5A, which makes the underwear more elastic. The thickness of the elastic yarn in this area is preferably 40dtex~140dtex, and the pre-stretch rate is preferably 150%~200%, which is intended to provide flexible lateral support and prevent the underwear from rolling up or twisting during activities.

[0034] Furthermore, the stretch rate of the buttocks 5 and crotch 6 in the length direction is 130%~150%. This area mainly requires stability and fit, while having good stretch rate, so as to adapt to the different physiological conditions of men and women, making the disposable underwear suitable for both men and women.

[0035] Furthermore, the elastic stretch structure 13 is made of spandex elastic yarn with a thickness of 10~1000 Dtex, which has a maximum elongation of 420% and can maintain a large tensile force for a long time after being stretched. Specifically, the thickness is also called decitex (Dtex). Decitex is a measure used in the textile industry to measure yarn or filament. 1 decitex = 1 gram / 10,000 meters. In other words, if 10,000 meters of yarn or filament weighs 500 grams, then the yarn or filament will have 500 decitex.

[0036] Reference Figure 7 As shown in the chart, the horizontal axis represents retention time (in hours), and the vertical axis represents the retention force over time (in percentage). Line ① represents the retention curve of existing disposable underwear with extruded strands at 34% strain. Lines ② and ③ represent the retention curves of disposable underwear using spandex elastic yarn as the elastic structure in this solution at different strains. Line ② represents the retention curve at 31% strain, and line ③ represents the retention curve at 62% strain. According to statistics, the average wearing time of disposable underwear is 3-4 hours. Based on the chart analysis, the retention force of disposable underwear using spandex elastic yarn as the elastic structure in this solution has a significant advantage over existing products after a longer period of use. This is attributed to the strong "anchoring" effect provided by the urea bonds in the spandex (polyurethane urea) molecule, which makes it less prone to stress relaxation at near-body temperature, ensuring a long-lasting fit.

[0037] Existing disposable underwear tends to become loose after being worn for a certain period of time (such as while walking) due to frequent muscle activity in the user's waist, hips, and thighs. However, the disposable underwear in this solution can maintain good elasticity, and thus, even after a longer period of time, the underwear will still fit the body with appropriate strength.

[0038] Furthermore, the first layer 11 and the second layer 12 are respectively made of non-woven fabric or woven fabric. The disposable underwear made of non-woven fabric is lightweight and breathable, making it suitable for summer wear. The disposable underwear made of woven fabric is moisture-wicking and breathable, and fits closer to the skin.

[0039] Furthermore, an inner lining 7 is provided on the inner side of the bottom panel 6. The inner lining 7 can be made of pure cotton or other moisture-absorbing non-woven fabric with a unit area weight of 30g / m² to 60g / m².

[0040] A manufacturing process for a general-purpose disposable underwear includes the following steps: S1, Elastic Material Composite Process: A first layer 11 and a second layer 12 made of nonwoven or woven fabric are provided. Multiple long and thin spandex elastic filaments with a thickness of 10~1000 Dtex are arranged in parallel at intervals of 0.4~4 mm along the stretching direction and sandwiched between the first layer 11 and the second layer 12. The first layer 11 and the second layer 12 are bonded together intermittently in the length direction of the spandex elastic filaments and continuously in the direction of crossing the spandex elastic filaments by means of an adhesive to form a sheet joint 14, thereby obtaining a continuous elastic composite material. S2, Liner bonding process: Provide a liner 7 made of a moisture-absorbing material, and bond the liner 7 to a predetermined position on the elastic composite material obtained in step S1 corresponding to the area of ​​the bottom panel 6 by spraying adhesive or hot pressing. S3. Die-cutting and folding process: Using a die-cutting tool, the continuous elastic composite material with the inner lining 7 attached is cut into an unfolded flat pant shape, and then folded along the center line of the pant shape. S4. Waist side sealing and cutting process: The folded pants are welded and sealed at the corresponding side positions of the front waist 4 and the back waist 3 by ultrasonic welding or hot pressing to form the waist side sealing part 8. Then, the sealing part is cut along the center line to separate and obtain an independent single disposable underwear product. S5. Folding and Packaging Process: Fold the single disposable underwear into a predetermined shape, put it into a packaging film, vacuum the air out, heat seal and cut it to make an independent sealed packaged product.

[0041] Preferably, in the S1 elastic material composite process, the spandex elastic yarn is pre-stretched during clamping, and the pre-stretch rate is set according to different parts of the underwear: the pre-stretch rate corresponding to the front waist 4 and back waist 3 areas is 200%~350%, the pre-stretch rate corresponding to the front stretch part 1 and back stretch part 2 areas is 150%~250%, and the pre-stretch rate corresponding to the buttocks 5 and crotch 6 areas is 130%~150%. In the S1 elastic material composite process, the adhesive is applied and transferred onto the first layer 11 or the second layer 12 by a printing roller. The width of the adhesive pattern on the outer circumferential surface of the printing roller in the circumferential direction is 0.2mm to 4mm, and the interval between adjacent adhesive patterns in the circumferential direction is 2mm to 8mm. In the S1 elastic material composite process, the amount of adhesive applied is 0.5g / m² to 8g / m². In the S4 waist-side sealing and cutting process, the waist-side sealing part 8 formed by ultrasonic welding or hot-press welding is an intermittent strip or dot-shaped welding pattern, rather than a continuous welding, to ensure the flexibility of this part. The packaging film used in the S5 folding and packaging process is made of a material that meets the requirements of ISO11607, GB / T19633 or YY / T0698 series standards for terminally sterilized medical device packaging, and the finished product can be sterilized by ethylene oxide or radiation.

[0042] The implementation principle of this invention is as follows: First, a high-density, fully distributed elastic network is formed by sandwiching a large number of fine denier spandex elastic yarns (10~1000Dtex) between two layers of fabric at a dense spacing (0.4~4mm).

[0043] Secondly, a specific adhesive is used to apply a pattern—a striped pattern that is discontinuous along the length of the elastic yarn and continuous along the vertical direction—to bond the three layers of material together. This bonding method ensures strong bonding while greatly limiting the area of ​​the rigid bonding zone (as low as 10%), allowing the fabric to freely form uniform and upright folds when the elastic yarn shrinks, rather than rigid blocks, thus combining high elasticity with excellent softness.

[0044] Furthermore, by precisely controlling the thickness, spacing, and pre-stretch rate of the spandex elastic yarns in different body areas (waist, hips, and legs), differentiated pressure mapping is achieved: a higher stretch rate (e.g., 250%~350%) and thicker elastic yarns are used in the waist area where high elasticity is required to provide a strong wrap-around fit; a moderate stretch rate (150%~250%) and thinner elastic yarns are used in the hips and upper thighs to provide flexible wrapping and support; and a lower stretch rate (130%~150%) is used in the crotch area to ensure stability and fit. This design allows a single product to adapt to a wide waist circumference range (e.g., 67cm~105cm) from M to XXL through its overall stretch potential of over 225%, without distinguishing between men's and women's styles. When worn by men, the highly elastic front waist area can naturally adapt to the physiological structure, achieving a universal fit.

[0045] Finally, by combining fully mechanized production processes (from material composite, die-cutting, folding, ultrasonic welding to individual packaging), high-efficiency and large-scale production are achieved while ensuring product hygiene and reducing costs, fundamentally solving the industry pain points of traditional products having many sizes, difficulty in selection, and low production efficiency.

[0046] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A universal disposable underwear, comprising a front piece and a back piece, characterized in that: The front piece includes a front waist section (4), a front telescopic section (1), and a bottom panel (6). The rear piece includes a rear waist section (3), a rear telescopic section (2), and a hip (5). The front piece and the rear piece are connected by the bottom panel (6). A lining (7) is also provided on the inner side of the bottom panel (6). Waist side sealing sections (8) are provided on both sides of the rear waist section (3) and the front waist section (4), the front telescopic section (1), and the rear telescopic section (2). Both the front piece and the rear piece consist of a first layer (11), a second layer (12) facing one side of the first layer (11), and multiple slender elastic telescopic knots. The structure (13) is arranged between the first layer (11) and the second layer (12) in a way that is spaced apart from each other along the stretching direction. Multiple sheet joints (14) are provided on both the first layer (11) and the second layer (12). Multiple adhesive blocks (15) are provided between the multiple sheet joints (14) and the elastic stretching structure (13). The multiple adhesive blocks (15) are arranged in a striped pattern that is discontinuous in the length direction of the elastic stretching structure (13) and continuous in the direction that intersects with the elastic stretching structure (13).

2. The universal disposable underwear according to claim 1, characterized in that: The spacing between adjacent elastic telescopic structures (13) is between 0.4 mm and 4 mm.

3. The universal disposable underwear according to claim 1, characterized in that: The elongation rate of the front waist (4) and the back waist (3) in the length direction is 250%~350%, the elongation rate of the front telescopic part (1) and the rear telescopic part (2) in the length direction is 150%~250%, and the elongation rate of the buttocks (5) and the crotch (6) in the length direction is 130%~150%.

4. The universal disposable underwear according to claim 1, characterized in that: The elastic stretching structure (13) is a spandex elastic yarn with a thickness of 10~1000 Dtex.

5. The universal disposable underwear according to claim 1, characterized in that: The first layer (11) and the second layer (12) are respectively made of nonwoven fabric or woven fabric.

6. A manufacturing process for general-purpose disposable underwear, characterized in that: S1, Elastic material composite process: Provide a first layer (11) and a second layer (12) made of nonwoven or woven fabric. Multiple long and thin spandex elastic filaments with a thickness of 10~1000 Dtex are arranged in parallel at intervals of 0.4~4 mm along the stretching direction and sandwiched between the first layer (11) and the second layer (12). The first layer (11) and the second layer (12) are bonded together intermittently in the length direction of the spandex elastic filaments and continuously in the direction of crossing the spandex elastic filaments by means of an adhesive to form a sheet joint (14) and obtain a continuous elastic composite material. S2, Liner bonding process: Provide a liner (7) made of a moisture-absorbing material, and bond the liner (7) to a predetermined position of the elastic composite material obtained in step S1 corresponding to the area of ​​the bottom (6) by spraying adhesive or hot pressing. S3. Die-cutting and folding process: Using a die-cutting tool, the continuous elastic composite material with the inner lining (7) attached is cut into an unfolded flat trouser shape, and then folded along the center line of the trouser shape; S4. Waist side sealing and cutting process: The folded pants are welded and sealed at the corresponding side positions of the front waist (4) and the back waist (3) by ultrasonic welding or hot pressing to form the waist side sealing part (8). Then, the sealing part is cut along the center line to separate and obtain an independent single disposable underwear product. S5. Folding and Packaging Process: Fold the single disposable underwear into a predetermined shape, put it into a packaging film, vacuum the air out, heat seal and cut it to make an independent sealed packaged product.

7. The manufacturing process of a general-purpose disposable underwear according to claim 6, characterized in that: In the S1 elastic material composite process, the spandex elastic yarn is pre-stretched during clamping, and the pre-stretch rate is set according to different parts of the underwear: the pre-stretch rate corresponding to the front waist (4) and back waist (3) area is 200%~350%, the pre-stretch rate corresponding to the front stretch part (1) and back stretch part (2) area is 150%~250%, and the pre-stretch rate corresponding to the buttocks (5) and crotch (6) area is 130%~150%.

8. The manufacturing process of a general-purpose disposable underwear according to claim 6, characterized in that: In the S1 elastic material composite process, the adhesive is applied and transferred onto the first layer (11) or the second layer (12) by a printing roller. The width of the adhesive pattern on the outer circumferential surface of the printing roller is 0.2mm to 4mm in the circumferential direction, and the interval between adjacent adhesive patterns in the circumferential direction is 2mm to 8mm.

9. The manufacturing process of a general-purpose disposable underwear according to claim 6, characterized in that: In the S1 elastic material composite process, the amount of adhesive applied is 0.5 g / m² to 8 g / m².

10. The manufacturing process of a general-purpose disposable underwear according to claim 6, characterized in that: In the S4 waist-side sealing and cutting process, the waist-side sealing part (8) formed by ultrasonic welding or hot-press welding is an intermittent strip or dot-shaped welding pattern, rather than a continuous welding, to ensure the softness of this part.

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