A method for manufacturing an elastic T-shaped diaper

Abstract

The present application relates to the field of disposable sanitary products, in particular to a preparation method of elastic T-shaped paper diaper, used for preparing elastic T-shaped paper diaper capable of increasing the fit and thus improving the comfort, comprising a paper diaper body, the preparation method of the paper diaper body comprising the following steps: 1) preparing a liquid-permeable surface layer; 2) preparing an absorbent core layer; 3) preparing a liquid-impermeable bottom layer; 4) respectively compounding the lateral two side edges of the absorbent core layer and the side edge of the front waist area on the liquid-impermeable bottom layer through the glue layer, and compounding and connecting the lower surface of the absorbent core layer with the connecting area of the second elastic sheet; 5) compounding the liquid-permeable surface layer on the absorbent core layer; 6) cutting the product of step 5 along the boundary of the adjacent two absorption units to form a single paper diaper body, the paper diaper body having a dynamic pressure of the front waist area and the back waist area in the wearing state of not less than 0.12 N / cm².

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene products, and more particularly to a method for preparing an elastic T-shaped diaper. Background Technology

[0002] The structure of a diaper is generally as follows: from top to bottom, it includes a liquid-permeable top layer, an absorbent core layer, and a liquid-impermeable bottom layer. The absorbent core layer is made of a combination of fluffy nonwoven fabric and superabsorbent polymer (SAP), or a mixture of wood pulp fiber and SAP and wrapped with nonwoven fabric to form a block structure. It is used to absorb and retain human excrement. The liquid-permeable top layer is composed of hydrophilic nonwoven fabric and hydrophobic nonwoven fabric fixed on both sides of the hydrophilic nonwoven fabric. It is used to provide a comfortable and dry feeling when in contact with the body, while allowing liquid to pass freely into the lower absorbent core layer. The liquid-impermeable bottom layer is composed of a breathable and water-impermeable film and a hydrophobic nonwoven fabric. It is used to keep the absorbed liquid in the absorbent core layer, thereby preventing the absorbed liquid from staining the wearer's pants.

[0003] In the current disposable diaper market, traditional diaper structures have certain limitations in terms of fit and comfort. The manufacturing and assembly of components such as the impermeable bottom layer, absorbent core, and permeable top layer in ordinary diapers are relatively conventional, making it difficult to adapt well to different user body shapes and activity levels. For example, during wear, the front and back waistbands of the diaper may not fit snugly against the body, leading to shifting and friction during activity, affecting not only the user experience but also potentially causing skin discomfort. Simultaneously, the absorbent core's structural design may not effectively and quickly absorb and disperse liquid, causing localized dampness and further reducing comfort. Furthermore, the elastic components in traditional diapers are poorly designed, failing to provide appropriate elastic support according to the body's dynamic changes, thus limiting the overall fit and comfort of the diaper. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention provides a method for preparing an elastic T-shaped diaper that can increase fit and thus improve comfort.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for preparing an elastic T-shaped diaper, comprising a diaper body, wherein the method for preparing the diaper body includes the following steps:

[0007] 1) Prepare a liquid-permeable surface layer;

[0008] 2) Preparation of the absorber core layer;

[0009] 3) Preparation of an impermeable liquid-absorbing bottom layer:

[0010] a. Unwind and transport the roll of bottom nonwoven fabric. Define the direction of transport of the bottom nonwoven fabric as the longitudinal direction and the direction of width of the bottom nonwoven fabric as the transverse direction. The bottom nonwoven fabric has a number of continuous absorption units along the longitudinal direction. Each absorption unit has a front waist area, a crotch area and a back waist area in sequence along the longitudinal direction.

[0011] b. Unwind and convey the rolled leg elastic bands, and attach the leg elastic bands to both sides of the transverse direction of each absorbent unit of the bottom nonwoven fabric.

[0012] c. Unwind and convey the first PE film in roll form, and laminate the first PE film onto the bottom non-woven fabric;

[0013] d. Prepare a first elastic sheet and cut the first elastic sheet into individual sheet-like structures. Then, composite the first elastic sheet into the back waist area of ​​each absorption unit of the product in step c. The first elastic sheet includes an upper sheet body, a lower sheet body, and several first elastic bands with a stretch ratio of 1.2 to 2.5 times disposed between the upper sheet body and the lower sheet body. Each of the first elastic bands is distributed in the transverse direction, so that the first elastic sheet can stretch and contract in the transverse direction.

[0014] e. Prepare a second elastic sheet and cut the second elastic sheet into a single sheet structure. The second elastic sheet includes a connecting area in the middle of the transverse direction and elastic areas distributed on both sides of the transverse direction.

[0015] f. Unwind and convey the rolled nonwoven fabric, and cut the nonwoven fabric into a left waistband and a right waistband;

[0016] g. Weld one end of the left waist belt and one end of the right waist belt to the free ends of the two elastic zones of the second elastic sheet, respectively.

[0017] h. The two transverse ends of the connecting area of ​​the second elastic sheet are combined with the transverse middle of the first elastic sheet. Without applying tension to the first elastic sheet, the connecting area of ​​the second elastic sheet is in a suspended state.

[0018] i. Attach the ear loops to the free ends of the left and right waist belts respectively;

[0019] 4) The two transverse sides of the absorbent core layer and the side in the front waist area are respectively bonded to the liquid-impermeable bottom layer with adhesive layers, and the lower surface of the absorbent core layer is bonded to the connection area of ​​the second elastic sheet, so that a cavity is formed between the absorbent core layer in the crotch area and the liquid-impermeable bottom layer, and the lower surfaces of the left waist belt and the right waist belt are bonded to the first PE film.

[0020] 5) Composite the liquid-permeable surface layer onto the absorbent core layer;

[0021] 6) The product from step 5 is cut along the boundary between two adjacent absorbent units to form a single diaper body. The diaper body has a dynamic pressure of not less than 0.12 N / cm² in the front waist area and the back waist area when worn.

[0022] Furthermore, the absorbent core layer includes an upper nonwoven fabric, a lower nonwoven fabric, a first bulky nonwoven fabric, and a second PE film. The lower surface of the first bulky nonwoven fabric is laminated onto the upper surface of the second PE film. The upper surface of the first bulky nonwoven fabric is sprayed with first superabsorbent polymer particles, and some of the first superabsorbent polymer particles are embedded in the pores of the first bulky nonwoven fabric to form a lower absorbent body. An absorbent material layer is provided between the upper and lower nonwoven fabrics. The upper nonwoven fabric, the absorbent material layer, and the lower nonwoven fabric form an upper absorbent body, which is laminated onto the lower absorbent body.

[0023] Furthermore, the absorbent material layer includes absorbent material comprising at least 70% by weight of a second superabsorbent polymer granules and wood pulp fibers. The absorbent material layer has at least one slit without absorbent material. The upper nonwoven fabric and the lower nonwoven fabric are compositely connected at the slit to form a guide channel.

[0024] Furthermore, no first superabsorbent polymer particles were sprayed on the first bulky nonwoven fabric at the location corresponding to the guide groove.

[0025] Furthermore, the basis weight of the first superabsorbent polymer particles is not greater than the basis weight of the second superabsorbent polymer particles.

[0026] Furthermore, the lateral expansion dimension of the first elastic sheet is greater than the lateral expansion dimension of the elastic region of the second elastic sheet.

[0027] Furthermore, without applying tension to the first elastic sheet, the impermeable bottom layer located in the crotch and lower back areas and distributed below the absorbent core layer forms wrinkled areas.

[0028] Furthermore, the lateral width of the rear waist area of ​​the impermeable bottom layer is greater than the lateral width of the front waist area.

[0029] Furthermore, the liquid-permeable surface layer includes a hydrophilic nonwoven fabric, two hydrophobic nonwoven fabrics, a second elastic band, and a second bulky nonwoven fabric. The hydrophilic nonwoven fabric covers the upper surface and the two transverse sides of the absorbent core layer. The two hydrophobic nonwoven fabrics are respectively fixed to the transverse sides of the hydrophilic nonwoven fabric. The free ends of the hydrophobic nonwoven fabrics are folded upward and laminated to the upper surface of the hydrophilic nonwoven fabric, so that a channel is formed on the hydrophobic nonwoven fabric. The second elastic band and the second bulky nonwoven fabric are respectively laminated to the inner surface of the channel to form a leak-proof partition.

[0030] Furthermore, the second bulky nonwoven fabric is distributed in the longitudinal middle of the leak-proof partition.

[0031] By adopting the aforementioned technical solution, the beneficial effects of this invention are as follows: In the preparation method of this elastic T-shaped diaper, during the preparation of the liquid-permeable bottom layer, the leg elastic bands, first PE film, first elastic sheet, second elastic sheet, left waistband, right waistband, and ear loop components are sequentially laminated. The rational combination and lamination order of these components make the diaper structurally more ergonomic. In particular, the arrangement of the first and second elastic sheets ensures that, without applying tension to the first elastic sheet, the connection area of ​​the second elastic sheet is suspended, providing excellent elastic support for the diaper after laminating the absorbent core layer and the liquid-permeable surface layer. The two-layer elastic stretch design better adapts to human movement, increasing the diaper's fit to the body and thus improving comfort. Simultaneously, a chamber is formed between the absorbent core and the liquid-proof bottom layer, facilitating air circulation and reducing stuffiness. Furthermore, this chamber provides cushioning during lateral stretching in the back waist area, ensuring dynamically constant waist pressure while wearing the diaper. The resulting diaper body maintains a dynamic pressure of no less than 0.12 N / cm² in both the front and back waist areas, guaranteeing appropriate pressure distribution and further enhancing fit and comfort. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention in use according to an embodiment;

[0033] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present invention in its unfolded state;

[0034] Figure 3 This is a top view of the structure in the unfolded state of an embodiment of the present invention;

[0035] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0036] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure at point BB.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Diaper body; 2. Adhesive layer; 3. Chamber; 4. Seam; 5. Wrinkle area; 6. Channel;

[0039] 11. Liquid-permeable surface layer; 111. Hydrophilic nonwoven fabric; 112. Hydrophobic nonwoven fabric; 113. Second elastic band; 114. Second bulky nonwoven fabric;

[0040] 12. Absorbent core layer; 121. Upper nonwoven fabric; 122. Lower nonwoven fabric; 123. First bulky nonwoven fabric; 124. Second PE film; 125. First superabsorbent polymer particles; 126. Second superabsorbent polymer particles; 127. Wood pulp fiber;

[0041] 13. Liquid-impermeable bottom layer; 131. Bottom non-woven fabric; 132. Leg band elastic; 133. First PE film; 134. First elastic sheet; 135. Second elastic sheet; 136. Left waistband; 137. Right waistband; 138. Ear loops;

[0042] 101. Front waist area; 102. Crotch area; 103. Back waist area; 201. Upper piece; 202. Lower piece; 203. First elastic band; 204. Connecting area; 205. Elastic area. Detailed Implementation

[0043] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0044] The embodiments of the present invention are as follows:

[0045] refer to Figures 1 to 5 As shown, a method for preparing an elastic T-shaped diaper includes a diaper body 1, and the method for preparing the diaper body 1 includes the following steps:

[0046] 1) Prepare a liquid-permeable surface layer 11;

[0047] 2) Preparation of absorber core layer 12;

[0048] 3) Preparation of an impermeable liquid-absorbing bottom layer 13:

[0049] a. Unwind and convey the rolled-up bottom nonwoven fabric 131. Define the conveying direction of the bottom nonwoven fabric 131 as the longitudinal direction and the width direction of the bottom nonwoven fabric 131 as the transverse direction. The bottom nonwoven fabric 131 has a number of continuous absorption units along the longitudinal direction. Each absorption unit has a front waist area 101, a crotch area 102 and a back waist area 103 in sequence along the longitudinal direction.

[0050] b. Unwind and convey the rolled leg elastic band 132, and attach the leg elastic band 132 to both sides of the transverse direction of each absorbent unit of the bottom nonwoven fabric 131.

[0051] c. Unwind and convey the first PE film 133 in roll form, and laminate the first PE film 133 onto the bottom non-woven fabric 131;

[0052] d. Prepare the first elastic sheet 134, and cut the first elastic sheet 134 into a single sheet structure. Then, composite the first elastic sheet 134 into the back waist area 103 of each absorption unit of the product in step c. The first elastic sheet 134 includes an upper sheet body 201, a lower sheet body 202, and six first elastic bands 203 with a stretch ratio of 1.8 times disposed between the upper sheet body 201 and the lower sheet body 202. Each of the first elastic bands 203 is distributed in the transverse direction, so that the first elastic sheet 134 can stretch and contract in the transverse direction.

[0053] e. Prepare a second elastic sheet 135 and cut the second elastic sheet 135 into a single sheet structure. The second elastic sheet 135 includes a connecting area 204 in the middle of the transverse direction and elastic areas 205 distributed on both sides of the transverse direction.

[0054] f. Unwind and convey the roll of nonwoven fabric, and cut the nonwoven fabric into left waistband 136 and right waistband 137.

[0055] g. Weld one end of the left waist belt 136 and the right waist belt 137 to the free ends of the two elastic areas 205 of the second elastic sheet 135 respectively.

[0056] h. The two transverse ends of the connecting area 204 of the second elastic sheet 135 are combined with the transverse middle of the first elastic sheet 134. Without applying a tension to the first elastic sheet 134, the connecting area 204 of the second elastic sheet 135 is in a suspended state.

[0057] i. Attach ear loops 138 to the free ends of the left waistband 136 and the right waistband 137 respectively;

[0058] 4) The two lateral sides of the absorbent core layer 12 and one side of the front waist area 101 are respectively bonded to the liquid-impermeable bottom layer 13 by the adhesive layer 2, and the lower surface of the absorbent core layer 12 is bonded to the connection area 204 of the second elastic sheet 135, so that the absorbent core layer 12 located in the crotch area 102 and the back waist area 103 forms a cavity 3 between the absorbent core layer 12 and the liquid-impermeable bottom layer 13, and the lower surfaces of the left waist belt 136 and the right waist belt 137 are bonded to the first PE film 133;

[0059] 5) The liquid-permeable surface layer 11 is laminated onto the absorbent core layer 12;

[0060] 6) The product from step 5 is cut along the boundary between two adjacent absorbent units to form a single diaper body 1. The diaper body 1 has a dynamic pressure of not less than 0.12 N / cm² in the front waist area 101 and the back waist area 103 when worn.

[0061] The manufacturing method of this elastic T-shaped diaper involves sequentially bonding the leg elastic bands 132, the first PE film 133, the first elastic sheet 134, the second elastic sheet 135, the left waistband 136, the right waistband 137, and the ear loops 138 during the preparation of the impermeable bottom layer 13. The rational combination and bonding sequence of these components make the diaper structurally more ergonomic. In particular, the placement of the first elastic sheet 134 and the second elastic sheet 135 ensures that, without applying tension to the first elastic sheet 134, the connecting area 204 of the second elastic sheet 135 is suspended, providing excellent elasticity to the diaper after bonding the absorbent core layer 12 and the permeable surface layer 11. The support creates a two-layer elastic stretch that better adapts to human movement, increasing the diaper's fit to the body and thus improving comfort. Simultaneously, a chamber 3 is formed between the absorbent core layer 12 and the liquid-impermeable bottom layer 13, facilitating air circulation and reducing stuffiness. Furthermore, during lateral stretching of the back waist area 103, this chamber 3 provides cushioning space, ensuring a dynamically constant waist pressure while the diaper is worn. Ultimately, the diaper body 1 exhibits a dynamic pressure of no less than 0.12 N / cm² in the front waist area 101 and back waist area 103 while worn, guaranteeing appropriate pressure distribution and further enhancing fit and comfort.

[0062] Specifically, the absorbent core layer 12 includes an upper nonwoven fabric 121, a lower nonwoven fabric 122, a first bulky nonwoven fabric 123, and a second PE film 124. The lower surface of the first bulky nonwoven fabric 123 is laminated onto the upper surface of the second PE film 124. The upper surface of the first bulky nonwoven fabric 123 is sprayed with first superabsorbent polymer particles 125, and some of the first superabsorbent polymer particles 125 are embedded in the pores of the first bulky nonwoven fabric 123 to form a lower absorbent body. The upper nonwoven fabric 121 and the lower nonwoven fabric 122... An absorbent material layer is provided between the layers of nonwoven fabric 122. The upper nonwoven fabric 121, the absorbent material layer, and the lower nonwoven fabric 122 form the upper absorbent body, which is composited on the lower absorbent body. The absorbent core layer 12 adopts a layered structure, with the upper nonwoven fabric 121, the absorbent material layer, and the lower nonwoven fabric 122 forming the upper absorbent body, and the first bulky nonwoven fabric 123, the second PE film 124, and the first superabsorbent polymer particles 125 forming the lower absorbent body. This layered design gives the absorbent core layer better absorption performance and uniform distribution. The upper and lower absorbent bodies work together to quickly absorb and lock in urine, preventing backflow and keeping the baby's skin dry, further improving comfort. At the same time, the first superabsorbent polymer particles 125 are partially embedded in the pores of the first bulky nonwoven fabric 123, enhancing the bonding force between the particles and the nonwoven fabric, reducing particle shedding, and further improving absorption performance.

[0063] Furthermore, the absorbent material layer includes absorbent material comprising 75% by weight of second superabsorbent polymer particles 126 and wood pulp fibers 127. The absorbent material layer has two slits 4 without absorbent material. The upper nonwoven fabric 121 and the lower nonwoven fabric 122 are compositely connected at the slits 4 to form a guide channel. The second superabsorbent polymer particles 126 have high water absorption, while the wood pulp fibers 127 have good guiding and dispersing effects. At the same time, the absorbent material layer has slits 4 without absorbent material, and the upper nonwoven fabric 121 and the lower nonwoven fabric 122 are compositely connected at the slits 4 to form a guide channel, which can quickly guide urine to diffuse to both sides, avoid urine from concentrating in one place, and improve the overall absorption efficiency of the absorbent core layer 12.

[0064] Furthermore, the first bulky nonwoven fabric 123 is not sprayed with first superabsorbent polymer particles 125 at the location corresponding to the flow channel. This can prevent the flow channel from being affected by too many first superabsorbent polymer particles 125 at the flow channel, thus ensuring that the flow channel can smoothly guide the urine to various parts of the absorbent core layer 12 and further improve the absorption performance.

[0065] Meanwhile, the weight of the first superabsorbent polymer granules 125 is not greater than the weight of the second superabsorbent polymer granules 126. By reasonably controlling the amount of the two superabsorbent polymer granules, the cost structure is optimized while ensuring absorption performance, making the product more economical while having good performance.

[0066] It is worth noting that the lateral stretch size of the first elastic sheet 134 is greater than that of the elastic area 205 of the second elastic sheet 135. This differentiated elastic design allows the diaper to better adapt to the baby's body movements and different body shapes in the waist area. The larger lateral stretch size of the first elastic sheet 134 provides basic, wide-range elastic support, while the second elastic sheet 135 makes fine adjustments in local areas. The two work together to make the diaper fit more tightly, forming a two-layer elastic stretch state, which is not easy to shift during activities and improves comfort. When no tension is applied to the first elastic sheet 134, the liquid-impermeable bottom layer 13 located in the crotch area 102 and the back waist area 103 and distributed on the underside of the absorbent core layer 12 forms a wrinkled area 5. The presence of the wrinkled area 5 increases the air circulation space between the diaper and the baby's body, which helps to dissipate heat and keep dry, reducing stuffiness. At the same time, the wrinkled area can also adapt to the baby's body movements to a certain extent, improving fit and comfort.

[0067] Furthermore, the lateral width of the back waist area 103 of the liquid-impermeable bottom layer 13 is greater than that of the front waist area 101, which conforms to the principles of ergonomics. The back waist area 103 needs to withstand more pressure and provide better wrapping. The wider back waist area 103 can better fit the baby's waist and prevent back leakage. At the same time, it works with the front waist area 101 to make the diaper more comfortable and stable to wear as a whole.

[0068] In this embodiment, the liquid-permeable surface layer 11 includes a hydrophilic nonwoven fabric 111, two hydrophobic nonwoven fabrics 112, a second elastic band 113, and a second bulky nonwoven fabric 114. The hydrophilic nonwoven fabric 111 covers the upper surface and two transverse sides of the absorbent core layer 12. The two hydrophobic nonwoven fabrics 112 are respectively fixed to the transverse sides of the hydrophilic nonwoven fabric 111. The free ends of the hydrophobic nonwoven fabrics 112 are folded upwards and laminated onto the upper surface of the hydrophilic nonwoven fabric 111, forming a channel 6 on the hydrophobic nonwoven fabric 112. The second elastic band 113 and the second bulky nonwoven fabric 114 are respectively laminated onto the inner surface of the channel 6 to form a leak-proof partition. The hydrophilic nonwoven fabric 111 covers... The absorbent core layer 12 surface quickly directs urine into the absorbent core layer 12; the hydrophobic nonwoven fabric 112 forms the channel 6, and the second elastic band 113 and the second bulky nonwoven fabric 114 are combined on the inner surface of the channel 6 to form a leak-proof partition, effectively preventing urine from leaking out. This multi-layer structure design not only improves the leak-proof performance, but also ensures the softness and breathability of the surface layer, improving the baby's wearing comfort; in addition, the second bulky nonwoven fabric 114 is distributed in the longitudinal middle of the leak-proof partition, which can enhance the elasticity and support of the middle of the leak-proof partition, better fit the curve of the human leg, and prevent urine from leaking out from the gap between the leg and the diaper, further improving the leak-proof performance and overall comfort of the diaper.

[0069] In this embodiment, the method for testing the dynamic pressure of the front waist area 101 and the back waist area 103 of the diaper body 1 under wearing conditions includes the following steps:

[0070] I. Test Principle:

[0071] By simulating the dynamic movements of an infant's waist (such as crawling, rolling over, and walking), high-precision pressure sensors are used to collect real-time pressure distribution data on the contact surface between the waistband and the skin. Combined with the deformation characteristics of the elastic waistband, the dynamic fit, pressure distribution ability, and comfort of the waistband are quantitatively evaluated.

[0072] II. Testing Equipment:

[0073] Sensor array: Employs flexible thin-film pressure sensors (such as the Tekscan F-Scan system), covering the waist circumference contact surface, with a sampling frequency ≥100Hz, resolution ≤1mm², and a measurement range of 0~50kPa;

[0074] Data acquisition module: Supports multi-channel synchronous acquisition and is compatible with wireless transmission to analysis software;

[0075] Simulated motion platform: Equipped with a six-degree-of-freedom robotic arm, it reproduces the lumbar movement trajectory of infants and young children (such as flexion, extension, lateral bending, and rotation), and the movement speed is adjustable from 0.1 to 1 m / s;

[0076] Infant buttock model: 3D printed silicone model with a surface that conforms to the texture of real skin, and a built-in adjustable waist size module (covering S / M / L / XL sizes).

[0077] Constant temperature and humidity chamber: simulates the actual use environment (temperature 23±2℃, humidity 50±5%RH);

[0078] High-speed camera: Records the waist deformation process (frame rate ≥ 1000fps) to assist in analyzing the dynamic relationship between pressure and deformation;

[0079] III. Testing Process:

[0080] 1. Sample preparation:

[0081] 1.1 Select the diaper sample to be tested and cut the waist circumference according to the standard (width 50mm, length covering the waist circumference of the model).

[0082] 1.2. Attach the sensor array to the corresponding area of ​​the model's waist, ensuring there are no air bubbles or wrinkles;

[0083] 1.3. Put on the diaper and adjust the waistband to a moderate tightness to simulate the tension of actual use;

[0084] 2. Dynamic stress test:

[0085] Sports mode settings:

[0086] Crawling mode: The robotic arm drives the model's waist to alternately flex and extend (amplitude ±15°, frequency 1Hz).

[0087] Turning mode: The model rotates to the side (angle ±90°, speed 0.5m / s);

[0088] Walking mode: simulates gait cycle (leg lift height 10cm, cadence 2Hz);

[0089] Data collection:

[0090] The pressure distribution, deformation, and motion trajectory are recorded synchronously, and each mode is tested 3 times in a loop, each lasting 60 seconds.

[0091] 3. Static pressure comparison test:

[0092] The waist of the model was fixed in a neutral position, a static load was applied (simulating an infant lying or sitting), and the pressure distribution and deformation were recorded.

[0093] IV. Indicator Analysis:

[0094] Dynamic peak pressure (DP-Peak)

[0095] Calculate the maximum pressure under each exercise mode to assess the waist circumference's adaptability to strenuous exercise;

[0096] Pressure distribution uniformity (PDI)

[0097] The pressure standard deviation is calculated using sensor data; a smaller PDI indicates more uniform pressure distribution.

[0098] Elastic recovery rate (ERR)

[0099] The deformation recovery rate of the waist circumference after dynamic stretching is measured to reflect long-term use comfort.

[0100] Test method: Cyclicly stretch the waist circumference to 150% deformation, repeat 100 times, and then measure the residual deformation;

[0101] Coefficient of friction (COF)

[0102] The ability to prevent red marks was assessed by measuring the dynamic friction between the waist circumference and the skin using a friction sensor.

[0103] Acceptable standard: COF ≤ 0.3;

[0104] V. Output the test report.

[0105] 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 one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0106] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0107] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0108] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art will understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method for preparing an elastic T-shaped diaper, characterized in that: The diaper body is included, and the method for preparing the diaper body includes the following steps: 1) Prepare a liquid-permeable surface layer; 2) Preparation of the absorber core layer; 3) Preparation of an impermeable liquid-absorbing bottom layer: a. Unwind and transport the roll of bottom nonwoven fabric. Define the direction of transport of the bottom nonwoven fabric as the longitudinal direction and the direction of width of the bottom nonwoven fabric as the transverse direction. The bottom nonwoven fabric has a number of continuous absorption units along the longitudinal direction. Each absorption unit has a front waist area, a crotch area and a back waist area in sequence along the longitudinal direction. b. Unwind and convey the rolled leg elastic bands, and attach the leg elastic bands to both sides of the transverse direction of each absorbent unit of the bottom nonwoven fabric. c. Unwind and convey the first PE film in roll form, and laminate the first PE film onto the bottom non-woven fabric; d. Prepare a first elastic sheet and cut the first elastic sheet into individual sheet-like structures. Then, composite the first elastic sheet into the back waist area of ​​each absorption unit of the product in step c. The first elastic sheet includes an upper sheet body, a lower sheet body, and several first elastic bands with a stretch ratio of 1.2 to 2.5 times disposed between the upper sheet body and the lower sheet body. Each of the first elastic bands is distributed in the transverse direction, so that the first elastic sheet can stretch and contract in the transverse direction. e. Prepare a second elastic sheet and cut the second elastic sheet into a single sheet structure. The second elastic sheet includes a connecting area in the middle of the lateral direction and elastic areas distributed on both sides of the lateral direction. The lateral expansion and contraction dimension of the first elastic sheet is greater than the lateral expansion and contraction dimension of the elastic area of ​​the second elastic sheet. f. Unwind and convey the rolled nonwoven fabric, and cut the nonwoven fabric into a left waistband and a right waistband; g. Weld one end of the left waist belt and one end of the right waist belt to the free ends of the two elastic zones of the second elastic sheet, respectively. h. The two transverse ends of the connecting area of ​​the second elastic sheet are combined with the transverse middle of the first elastic sheet. Without applying tension to the first elastic sheet, the connecting area of ​​the second elastic sheet is in a suspended state. i. Attach the ear loops to the free ends of the left and right waistbands respectively; 4) The two transverse sides of the absorbent core layer and the side in the front waist area are respectively bonded to the liquid-impermeable bottom layer with adhesive layers, and the lower surface of the absorbent core layer is bonded to the connection area of ​​the second elastic sheet, so that a cavity is formed between the absorbent core layer in the crotch area and the liquid-impermeable bottom layer, and the lower surfaces of the left waist belt and the right waist belt are bonded to the first PE film. 5) Composite the liquid-permeable surface layer onto the absorbent core layer; 6) The product from step 5 is cut along the boundary between two adjacent absorbent units to form a single diaper body. The diaper body has a dynamic pressure of not less than 0.12 N / cm² in the front waist area and back waist area when worn. Without applying tension to the first elastic sheet, the liquid-impermeable bottom layer located in the crotch area and back waist area and distributed on the underside of the absorbent core layer forms a wrinkled area. The lateral width of the back waist area of ​​the liquid-impermeable bottom layer is greater than the lateral width of the front waist area.

2. The method for preparing the elastic T-shaped diaper according to claim 1, characterized in that: The absorbent core layer includes an upper nonwoven fabric, a lower nonwoven fabric, a first bulky nonwoven fabric, and a second PE film. The lower surface of the first bulky nonwoven fabric is laminated onto the upper surface of the second PE film. The upper surface of the first bulky nonwoven fabric is sprayed with first superabsorbent polymer particles, and some of the first superabsorbent polymer particles are embedded in the pores of the first bulky nonwoven fabric to form a lower absorbent body. An absorbent material layer is provided between the upper and lower nonwoven fabrics. The upper nonwoven fabric, the absorbent material layer, and the lower nonwoven fabric form an upper absorbent body, which is laminated onto the lower absorbent body.

3. The method for preparing the elastic T-shaped diaper according to claim 2, characterized in that: The absorbent material layer includes absorbent material comprising at least 70% by weight of a second superabsorbent polymer granules and wood pulp fibers. The absorbent material layer has at least one slit without absorbent material. The upper nonwoven fabric and the lower nonwoven fabric are compositely connected at the slit to form a guide channel.

4. The method for preparing the elastic T-shaped diaper according to claim 3, characterized in that: No superabsorbent polymer particles were sprayed on the first bulky nonwoven fabric at the location corresponding to the guide groove.

5. The method for preparing the elastic T-shaped diaper according to claim 4, characterized in that: The weight of the first superabsorbent polymer particles is not greater than the weight of the second superabsorbent polymer particles.

6. The method for preparing the elastic T-shaped diaper according to any one of claims 1 to 5, characterized in that: The liquid-permeable surface layer includes a hydrophilic nonwoven fabric, two hydrophobic nonwoven fabrics, a second elastic band, and a second bulky nonwoven fabric. The hydrophilic nonwoven fabric covers the upper surface and the two transverse sides of the absorbent core layer. The two hydrophobic nonwoven fabrics are respectively fixed on the transverse sides of the hydrophilic nonwoven fabric. The free ends of the hydrophobic nonwoven fabrics are folded upward and laminated to the upper surface of the hydrophilic nonwoven fabric, so that a channel is formed on the hydrophobic nonwoven fabric. The second elastic band and the second bulky nonwoven fabric are respectively laminated to the inner surface of the channel to form a leak-proof partition.

7. The method for preparing the elastic T-shaped diaper according to claim 6, characterized in that: The second bulky nonwoven fabric is distributed in the longitudinal middle of the leak-proof partition.

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