Preparation method of bubble-shaped waist diaper

Abstract

The present invention relates to the field of sanitary products and provides a method for preparing a bubble-shaped waist diaper, which solves the problems of poor fit and comfort caused by the lack of elastic partitioning in the waist of traditional diapers, and the unreasonable ventilation structure of the waist causing stuffiness and red buttocks; the method comprises the following steps: (1) elastic waist shaping: fixing a first elastic material and a second elastic material between an inner bottom non-woven fabric and an outer bottom non-woven fabric to form an elastic composite layer; (2) preparing an Ω-shaped inverted structure: stretching the elastic composite layer in the transverse direction to 150%-180% of the original length, pressing the stretched elastic composite layer, releasing the tooling fixture to allow the elastic composite layer to retract, forming an Ω-shaped inverted structure, and constituting a bubble fluffy part; (3) ventilation treatment; (4) composite assembly: composite the elastic waist treated in step (3) with the diaper body to obtain a bubble-shaped waist diaper.

Description

Technical Field

[0001] The present invention relates to the field of sanitary products, and in particular to a method for preparing a bubble-shaped waist diaper. Background Art

[0002] Diapers are essential for daily infant care, and their performance is directly related to a baby's health and comfort. Throughout the development of diapers, the design and performance of the waistband have always been a key area of ​​research and improvement. The elastic distribution of traditional diaper waistbands often lacks targeted design. Most waistbands use a single elastic material or a uniform elastic distribution, which fails to meet the varying elasticity requirements of different parts of a baby's body. Given the delicate nature of babies' skin, prolonged diaper wear makes breathability in the waistband crucial. However, the ventilation structure of traditional diaper waistbands is often inadequately designed.

[0003] Chinese Patent Publication No. CN217593237U discloses a pair of comfortable bubble pants. The extended waist design of the bubble pants is achieved by folding the inner and outer layers of non-woven fabric to form a bubble-like fluffy area. This three-dimensional structure aims to enhance waist softness and breathability. Elasticity differentiation is achieved by adjusting the density of elastic bands in the extended waist and waist layer. However, the bubble shape control in this application is insufficient in structural stability, and the elastic zoning precision and dynamic adaptability are relatively weak.

[0004] Chinese patent publication number CN219207731U discloses a pair of pull-up pants with a bubble-shaped, comfortable and breathable waistline. The bubble waistline is formed by an inner / outer pleated structure, and breathability is achieved by connecting the air holes in the pleated part with the blank space. However, this application also has deficiencies in the shape control of the bubble waistline and the structural stability. Summary of the Invention

[0005] Therefore, in response to the above problems, the present invention provides a method for preparing bubble-shaped waist diapers to solve the problems of traditional diapers lacking elastic partitions at the waist resulting in poor fit and comfort, as well as unreasonable ventilation structure of the waist causing stuffiness and red buttocks.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for preparing a bubble-shaped waist diaper comprises the following steps:

[0008] S1. Elastic waistline forming: Fixing a first elastic material and a second elastic material between an inner bottom non-woven fabric and an outer bottom non-woven fabric to form an elastic composite layer, wherein the elastic composite layer includes a first elastic region and a second elastic region, wherein the first elastic region is located in the side waist region, and the second elastic region is located in the front waist region and the back waist region, and the elastic modulus of the first elastic region is 20%-50% higher than that of the second elastic region;

[0009] S2. Preparation of an Ω-shaped inverted structure: The elastic composite layer is stretched in the transverse direction to 150%-180% of its original length and fixed to a high-temperature resistant fixture. The stretched elastic composite layer is pressed using a dual-temperature zone hot pressing roller assembly, wherein the upper roller surface is provided with a micro-convex array and the lower roller surface is provided with a shallow concave array. After pressing, the elastic composite layer is cooled by a -10°C cold air circulation system to set the shape. The fixture is released to allow the elastic composite layer to retract. The elastic composite layer is driven by the rebound force to form an Ω-shaped inverted structure, constituting the bubble fluffy portion.

[0010] S3. Breathability treatment: Punch holes in the elastic waist with a hole diameter of 0.1mm-1mm and a hole density of 50 holes / cm 2 -200 pieces / cm 2 , and the hole density in the side waist area is 10%-30% higher than that in the second elastic zone;

[0011] S4, composite assembly: the elastic waistband processed in step S3 is composited with the diaper body, and the two ends of the elastic waistband are coated on the inner and outer sides of the diaper body by heat pressing or ultrasonic wave to obtain a bubble waist diaper.

[0012] Further: the outer bottom layer non-woven fabric is a breathable PE film or hot air non-woven fabric with a gram weight of 15g / m 2 -25g / m 2 The inner bottom layer non-woven fabric is a hydrophilic spunbond non-woven fabric with a gram weight of 10g / m 2 -20g / m 2 .

[0013] Furthermore: the first elastic material is spandex yarn, and the stretching ratio is 3.0 times to 4.5 times; the second elastic material is an elastic film or elastic non-woven fabric, and the stretching ratio is 2.0 times to 3.0 times.

[0014] Furthermore, the second elastic zone of the elastic waist is further provided with transversely arranged auxiliary elastic rubber bands, the stretching ratio of the auxiliary elastic rubber bands is 1.5 times to 2.0 times, and the auxiliary elastic rubber bands are arranged at intervals of 5mm to 10mm.

[0015] Furthermore, the wrinkle density of the Ω-shaped inverted structure in the side waist region is 30%-50% higher than that in the second elastic region.

[0016] Furthermore: the thickness of the air cavity naturally formed between the inner bottom layer non-woven fabric and the outer bottom layer non-woven fabric is 0.5mm-1.5mm.

[0017] Furthermore: the bonding method of the hot pressing or ultrasonic welding points is intermittently distributed, and the bonding area corresponds to the position of the first elastic material and the auxiliary elastic band to avoid delamination of the wrinkle waves during dynamic stretching.

[0018] Among them, the intermittent distribution bonding method can not only ensure the firm connection between the waistband and the diaper body, but also avoid delamination of the pleat waves during dynamic stretching, ensuring that the waistband always maintains good elasticity and structural integrity during the baby's activities, thereby improving the reliability and service life of the diaper.

[0019] Furthermore: the elastic resilience of the waistline is controlled within a range of 460gf-520gf.

[0020] Furthermore: the temperature of the upper roller is 120℃-140℃, and the temperature of the lower roller is 90℃-110℃.

[0021] Further: in step S2, the pressing pressure is 0.5MPa-1.2MPa, and the contact time is 2s-4s.

[0022] In the waist design of diapers, gf represents the rebound force of the elastic material, that is, the force generated when the waist returns to its original shape after being stretched. This value directly affects the fit and comfort of the waist.

[0023] By adopting the above technical solution, the beneficial effects of the present invention are:

[0024] 1. By setting the first and second elastic zones with different elastic moduli, the side waist area (first elastic zone) can provide stronger elastic support, better fit the baby's body curve, and prevent side leakage; the front waist area and the back waist area (second elastic zone) have moderate elasticity, which improves wearing comfort and avoids being too tight to restrain the baby.

[0025] 2. The elastic composite layer is formed into an Ω-shaped inverted structure through stretching, hot pressing, cooling and shaping, and then shrinking. This constitutes the bubble fluffy part, achieving more precise control of the bubble shape and having significant advantages in structural stability. At the same time, it increases the fluffiness and softness of the waist, reduces the contact area with the baby's skin, reduces friction, and improves comfort. The bubble structure can also store a certain amount of air, and the circulation of air helps to reduce the feeling of stuffiness and enhance breathability.

[0026] 3. Punching holes in the elastic waist effectively improves the breathability of the waist, allowing the baby's skin to breathe freely, reducing the feeling of stuffiness and the occurrence of skin problems such as diaper rash.

[0027] 4. The auxiliary elastic band further enhances the elasticity of the second elastic zone, enabling it to better adapt to the movement of the baby's waist, provide more uniform elastic support, prevent the waist from loosening or shifting, and improve the leak-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a diaper in Example 1 of the present invention;

[0029] Figure 2This is a schematic structural diagram of the elastic composite layer in the second elastic zone in Example 1 of the present invention;

[0030] Figure 3 This is a schematic structural diagram of the elastic composite layer in the first elastic region in Example 1 of the present invention;

[0031] Figure 4 Schematic diagram of the structure of the Ω-shaped inverted structure in Example 1 of the present invention;

[0032] Explanation of the numbers in the figure: 1-first elastic material, 2-second elastic material, 3-inner bottom layer non-woven fabric, 4-outer bottom layer non-woven fabric, 11-first elastic area, 12-second elastic area, 5-auxiliary elastic rubber band, 6-Ω-shaped inverted structure. DETAILED DESCRIPTION

[0033] Example 1

[0034] refer to Figures 1 to 4 A method for preparing a bubble-shaped waist diaper comprises the following steps:

[0035] (1) Elastic waist shaping

[0036] A first elastic material 1 and a second elastic material 2 are fixed between an inner bottom non-woven fabric 3 and an outer bottom non-woven fabric 4 to form an elastic composite layer. The elastic composite layer includes a first elastic region 11 and a second elastic region 12. The first elastic region 11 is located in the side waist region, and the second elastic region 12 is located in the front waist region and the back waist region. The elastic modulus of the first elastic region 11 is 20% higher than that of the second elastic region 12.

[0037] The outer bottom non-woven fabric 4 is a breathable PE film with a gram weight of 15g / m 2 The inner bottom layer non-woven fabric 3 is a hydrophilic spunbond non-woven fabric with a gram weight of 10g / m 2 ;

[0038] The first elastic material 1 is spandex yarn with a stretching ratio of 3.0 times; the second elastic material 2 is an elastic film with a stretching ratio of 2.0 times;

[0039] The second elastic zone 12 of the elastic waist is further provided with transversely arranged auxiliary elastic rubber bands 5, the stretching ratio of the auxiliary elastic rubber bands 5 is 1.5 times, and the intervals are 5 mm.

[0040] The elastic resilience of the waistline is controlled at 460gf;

[0041] (2) Preparation of Ω-shaped inverted structure

[0042] The elastic composite layer is stretched in the transverse direction to 150% of its original length and fixed on a high-temperature resistant fixture. The stretched elastic composite layer is pressed using a dual-temperature zone hot pressing roller group, wherein the upper roller surface is provided with a micro-convex array and the lower roller surface is provided with a shallow concave array. After pressing, the elastic composite layer is cooled and shaped by circulating cold air at -10°C. The fixture is released to allow the elastic composite layer to retract. The elastic composite layer is driven by the rebound force to form an Ω-shaped inverted structure 6, which constitutes the bubble fluffy portion.

[0043] The lamination pressure is 0.5 MPa, the contact time is 2 s, the upper roller temperature is 120°C, and the lower roller temperature is 90°C.

[0044] The wrinkle density of the Ω-shaped inverted structure 6 in the first elastic zone is 30% higher than that in the second elastic zone;

[0045] The thickness H of the air cavity naturally formed between the inner bottom non-woven fabric 3 and the outer bottom non-woven fabric 4 is 0.5 mm;

[0046] (3) Breathability treatment

[0047] Punch holes in the elastic waist with a hole diameter of 1 mm. The hole density in the first elastic area is 10% higher than that in the second elastic area.

[0048] (4) Composite assembly

[0049] The elastic waistband processed in step (3) is compounded with the diaper body, and the two ends of the elastic waistband are coated on the inner and outer sides of the diaper body by ultrasonic welding to obtain a bubble-shaped waistband diaper;

[0050] The bonding mode of the ultrasonic welding points is intermittently distributed, and the bonding areas correspond to the positions of the first elastic material and the auxiliary elastic band to avoid delamination of the wrinkle waves during dynamic stretching.

[0051] Example 2

[0052] A method for preparing a bubble-shaped waist diaper comprises the following steps:

[0053] (1) Elastic waist shaping

[0054] Fixing the first elastic material and the second elastic material between the inner bottom non-woven fabric and the outer bottom non-woven fabric to form an elastic composite layer, the elastic composite layer comprising a first elastic region and a second elastic region, the first elastic region being located in the side waist region, the second elastic region being located in the front waist region and the back waist region, and the elastic modulus of the first elastic region being 30% higher than that of the second elastic region;

[0055] The outer bottom non-woven fabric is a hot air non-woven fabric with a gram weight of 20g / m 2 The inner bottom layer non-woven fabric is a hydrophilic spunbond non-woven fabric with a gram weight of 15g / m2 ;

[0056] The first elastic material is spandex with a stretch ratio of 3.5 times; the second elastic material is elastic non-woven fabric with a stretch ratio of 2.5 times;

[0057] The second elastic zone of the elastic waist is further provided with transversely arranged auxiliary elastic bands, the stretching ratio of the auxiliary elastic bands is 2.0 times, and the intervals are 8 mm.

[0058] The elastic resilience of the waistline is controlled at 490gf;

[0059] (2) Preparation of Ω-shaped inverted structure

[0060] The elastic composite layer is stretched in the transverse direction to 160% of its original length and fixed on a high-temperature resistant fixture. The stretched elastic composite layer is pressed using a dual-temperature zone hot pressing roller group, wherein the upper roller surface is provided with a micro-convex array and the lower roller surface is provided with a shallow concave array. After pressing, the elastic composite layer is cooled and shaped by circulating cold air at -10°C. The fixture is released to allow the elastic composite layer to retract. The elastic composite layer is driven by the rebound force to form an Ω-shaped inverted structure, forming a bubble fluffy portion.

[0061] The lamination pressure is 1.0 MPa, the contact time is 2 s, the upper roller temperature is 130°C, and the lower roller temperature is 100°C.

[0062] The omega-shaped inverted structure has a fold density in the first elastic zone that is 40% higher than that in the second elastic zone;

[0063] The thickness of the air cavity naturally formed between the inner bottom non-woven fabric and the outer bottom non-woven fabric is 1.0 mm;

[0064] (3) Breathability treatment

[0065] Punch holes in the elastic waist with a diameter of 0.5mm. The hole density in the side waist area is 20% higher than that in the second elastic area.

[0066] (4) Composite assembly

[0067] The elastic waistband processed in step (3) is combined with the diaper body, and the two ends of the elastic waistband are covered on the inner and outer sides of the diaper body by hot pressing welding to obtain a bubble waist diaper;

[0068] The bonding method of the hot pressing welding points is intermittently distributed, and the bonding areas correspond to the positions of the first elastic material and the auxiliary elastic band to prevent the wrinkle waves from delaminating during dynamic stretching.

[0069] Example 3

[0070] A method for preparing a bubble-shaped waist diaper comprises the following steps:

[0071] (1) Elastic waist shaping

[0072] Fixing the first elastic material and the second elastic material between the inner bottom non-woven fabric and the outer bottom non-woven fabric to form an elastic composite layer, wherein the elastic composite layer includes a first elastic region and a second elastic region, wherein the first elastic region is located in the side waist region, and the second elastic region is located in the front waist region and the back waist region, and the elastic modulus of the first elastic region is 50% higher than that of the second elastic region;

[0073] The outer bottom non-woven fabric is a breathable PE film with a gram weight of 25g / m 2 The inner bottom layer non-woven fabric is a hydrophilic spunbond non-woven fabric with a gram weight of 20g / m 2 ;

[0074] The first elastic material is spandex yarn with a stretching ratio of 4.5 times; the second elastic material is an elastic film with a stretching ratio of 3.0 times;

[0075] The second elastic zone of the elastic waist is further provided with transversely arranged auxiliary elastic bands, the stretching ratio of the auxiliary elastic bands is 2.0 times, and the intervals are 10 mm.

[0076] The elastic resilience of the waistline is controlled at 520gf;

[0077] (2) Preparation of Ω-shaped inverted structure

[0078] The elastic composite layer is stretched in the transverse direction to 180% of its original length and fixed on a high-temperature resistant fixture. The stretched elastic composite layer is pressed using a dual-temperature zone hot pressing roller group, wherein the upper roller surface is provided with a micro-convex array and the lower roller surface is provided with a shallow concave array. After pressing, the elastic composite layer is cooled and shaped by circulating cold air at -10°C. The fixture is released to allow the elastic composite layer to retract. The elastic composite layer is driven by the rebound force to form an Ω-shaped inverted structure, forming a bubble fluffy portion.

[0079] The lamination pressure is 1.2 MPa, the contact time is 2 s, the upper roller temperature is 140°C, and the lower roller temperature is 110°C.

[0080] The omega-shaped inverted structure has a pleat density in the first elastic zone that is 50% higher than that in the second elastic zone;

[0081] The thickness of the air cavity naturally formed between the inner bottom non-woven fabric and the outer bottom non-woven fabric is 1.5 mm;

[0082] (3) Breathability treatment

[0083] Punch holes in the elastic waist with a diameter of 1mm. The hole density in the side waist area is 30% higher than that in the second elastic area.

[0084] (4) Composite assembly

[0085] The elastic waistband processed in step (3) is compounded with the diaper body, and the two ends of the elastic waistband are coated on the inner and outer sides of the diaper body by ultrasonic welding to obtain a bubble-shaped waistband diaper;

[0086] The bonding mode of the ultrasonic welding points is intermittently distributed, and the bonding areas correspond to the positions of the first elastic material and the auxiliary elastic band to avoid delamination of the wrinkle waves during dynamic stretching.

[0087] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A method for preparing a bubble-shaped waist diaper, characterized in that: The following steps are involved: S1. Elastic Waist Forming: Fixing a first elastic material and a second elastic material between an inner bottom non-woven fabric and an outer bottom non-woven fabric to form an elastic composite layer, wherein the elastic composite layer includes a first elastic region and a second elastic region, wherein the first elastic region is located in the side waist region, and the second elastic region is located in the front waist region and the back waist region, and the elastic modulus of the first elastic region is 20%-50% higher than that of the second elastic region; S2. Preparation of an Ω-shaped inverted structure: The elastic composite layer is stretched in the transverse direction to 150%-180% of its original length and fixed to a high-temperature resistant fixture. The stretched elastic composite layer is pressed using a dual-temperature zone hot pressing roller assembly, wherein the upper roller surface is provided with a micro-convex array and the lower roller surface is provided with a shallow concave array. After pressing, the elastic composite layer is cooled by a -10°C cold air circulation system to set the shape. The fixture is released to allow the elastic composite layer to retract. The elastic composite layer is driven by the rebound force to form an Ω-shaped inverted structure, constituting the bubble fluffy portion. S3. Breathability treatment: Punch holes in the elastic waist with a hole diameter of 0.1mm-1mm and a hole density of 50 holes / cm 2 -200 pieces / cm 2 , and the hole density in the side waist area is 10%-30% higher than that in the second elastic zone; S4, composite assembly: the elastic waistband processed in step S3 is composited with the diaper body, and the two ends of the elastic waistband are coated on the inner and outer sides of the diaper body by heat pressing or ultrasonic wave to obtain a bubble waist diaper; Wherein, in step S2, the temperature of the upper roller is 120°C-140°C, and the temperature of the lower roller is 90°C-110°C; the pressing pressure is 0.5MPa-1.2MPa, and the contact time is 2s-4s.

2. The method for preparing a bubble-shaped waist diaper according to claim 1, characterized in that: The outer bottom layer non-woven fabric is a breathable PE film or hot air non-woven fabric with a gram weight of 15g / m 2 -25g / m 2 The inner bottom layer non-woven fabric is a hydrophilic spunbond non-woven fabric with a gram weight of 10g / m 2 -20g / m 2 .

3. The method for preparing a bubble-shaped waist diaper according to claim 1, wherein: The first elastic material is spandex yarn, and the stretching ratio is 3.0 times to 4.5 times; the second elastic material is an elastic film or elastic non-woven fabric, and the stretching ratio is 2.0 times to 3.0 times.

4. The method for preparing a bubble-shaped waist diaper according to claim 1, wherein: The second elastic zone of the elastic waist is further provided with transversely arranged auxiliary elastic rubber bands, the stretching ratio of the auxiliary elastic rubber bands is 1.5 times to 2.0 times, and the auxiliary elastic rubber bands are arranged at intervals of 5mm to 10mm.

5. The method for preparing a bubble-shaped waist diaper according to claim 1, characterized in that: The pleat density of the Ω-shaped inverted structure in the side waist region is 30%-50% higher than that in the second elastic region.

6. The method for preparing a bubble-shaped waist diaper according to claim 1, characterized in that: The thickness of the air cavity naturally formed between the inner bottom layer non-woven fabric and the outer bottom layer non-woven fabric is 0.5mm-1.5mm.

7. The method for preparing a bubble-shaped waist diaper according to claim 1, wherein: The bonding method of the heat pressing or ultrasonic welding points is intermittently distributed, and the bonding areas correspond to the positions of the first elastic material and the auxiliary elastic band to avoid delamination of the wrinkle waves during dynamic stretching.

8. The method for preparing a bubble-shaped waist diaper according to claim 1, characterized in that: The elastic resilience of the waistline is controlled within a range of 460gf-520gf.

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