Preparation method of paper diaper with front and back elastic bud structures

Abstract

The invention relates to the field of hygienic products, provides a preparation method of a paper diaper with front and back elastic bud structures, and solves the problems that the paper diaper in the prior art is poor in leakage-proof effect, not soft enough and poor in fitness. Comprising the following preparation steps: (1) uncoiling and conveying a surface layer non-woven fabric on line, and compounding hydrophobic separation edges on two sides of the surface layer non-woven fabric on line to form a non-woven fabric composite material compounded with the hydrophobic separation edges on two sides; (2) compounding an elastic waistline on line; (3) on-line compounding of a leg circumference rubber band, a hook-and-loop fastener and a hook-and-loop fastener; (4) the paper diaper body, the bottom layer and the absorbing core body which are conveyed on line are compounded into a whole on line to form the paper diaper body; and (5) cutting into single articles, and cutting along the middle line of the interval area of the front-end spandex yarn and the rear-end spandex yarn to obtain a single paper diaper with a front-rear elastic bud structure.

Description

Technical Field

[0001] This invention relates to the field of hygiene products, and more particularly to a method for preparing a diaper with a front and back elastic bud structure. Background Technology

[0002] Diaper leakage remains one of the most frequent consumer complaints, leading consumers to increasingly prioritize leak-proof performance when purchasing diapers. The main causes of diaper leakage include poor fit, slow absorption, and saturation. Product fit is the primary influencing factor; improving the fit effectively reduces leakage.

[0003] Chinese Patent No. 202210184756.0 discloses a ventilated and leak-proof diaper, including a diaper body. The diaper body is composed of an impermeable bottom layer, a core layer, a distribution layer, and a top layer stacked sequentially from the outside in. The top layer, distribution layer, and impermeable bottom layer are pressed together to enclose the core layer. The impermeable bottom layer has fine, permeable ventilation channels extending through the entire diaper body along a U-shaped path from the outside in. The area through which the diaper passes and its adjacent areas are heat-pressed. A leak-proof top layer is installed over the portion of the fine breathable tube exposed inside the diaper. This leak-proof top layer is tightly fitted and pressed against the surface layer near both ends of the fine breathable tube along its length. Leak-proof grooves extending to the joint between the leak-proof top layer and the surface layer are provided on both sides of the fine breathable tube along its width. The two sides of the leak-proof top layer along its length are tightly connected to the surface layer. The leak-proof top layer is not provided except in the area where the fine breathable tube passes through the surface layer. This patent, through the design of the leak-proof grooves, prevents liquid leakage. Furthermore, by providing air inlets and outlets on both sides (not near the edges), the airflow generated by the movement of a person through these two structures allows air to bypass the impermeable bottom layer, pass through the diaper body to the surface layer, and finally exit from both sides of the leak-proof top layer, providing the user with a cool and breathable feeling on the inside of the diaper. This patented product has both leak-proof and breathable properties, but it does not improve the waist area and has poor fit. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention provides a method for preparing a diaper with a front and back elastic bud structure, which solves the problems of poor leak prevention, insufficient softness, and poor fit of the diapers in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing a diaper with a front and rear elastic bud structure, comprising the following preparation steps:

[0006] (1) The surface non-woven fabric is unwound and transported online, and hydrophobic spacers are laminated on both sides of the surface non-woven fabric online to form a non-woven fabric composite material with hydrophobic spacers on both sides.

[0007] (2) Online composite elastic waistband;

[0008] The preparation process of the elastic waistband is as follows:

[0009] a. Online unwinding and conveying of waistband nonwoven fabric;

[0010] b. Several spandex filaments are laid out in the non-woven fabric of the waistband at intervals along the transmission direction. The spandex filaments are composed of several front spandex filaments and several rear spandex filaments, and the front spandex filaments and rear spandex filaments are arranged at intervals of 35-40mm.

[0011] c. Apply hot melt adhesive online to each of the spandex filaments. In the interval between the front spandex filament and the rear spandex filament, front waistband sealing adhesive and rear waistband sealing adhesive are provided. The front waistband sealing adhesive is 10-12mm away from the nearest front spandex filament, and the rear waistband sealing adhesive is 10-12mm away from the nearest rear spandex filament.

[0012] d. Fold the non-woven fabric of the waistband in half to cover the spandex yarn and combine them into one piece to form an elastic waistband. When folding, the area without spandex yarn is folded over to cover the area with spandex yarn.

[0013] The elastic waistband is laminated between two diaper bodies, so that after slitting, the elastic waistband with the front spandex filament is cut to the front end of one diaper body, and the elastic waistband with the rear spandex filament is cut to the rear end of the other diaper body.

[0014] (3) Online composite leg band, hook and loop fastener;

[0015] (4) The diaper body is formed by online composite of the bottom layer and absorbent core, and the diaper body has a top layer, absorbent core and bottom layer stacked from top to bottom, and the top layer has hydrophobic side panels on both sides of the lateral direction.

[0016] (5) Cut into individual items, cut along the midline of the area between the front spandex filament and the rear spandex filament to obtain individual diapers with front and rear elastic bud structures.

[0017] Further: After step (2) and before step (3), soft fine denier water-repellent hot air nonwoven fabric is laminated online at the same position as the elastic waistband, and the hot air nonwoven fabric is fixedly connected to the surface layer and the hydrophobic side panels by ultrasonic pressure rollers.

[0018] Furthermore: the ultrasonic pressure roller has a pressure point width of 0.6-1.0mm and a length of 1.5-2.5mm, with a length gap of 2.5-3.5mm and a width gap of ≥10mm between each pressure point.

[0019] Furthermore: the hot air nonwoven fabric covering the absorbent core is not ultrasonically welded, and the ultrasonic pressure rollers closest to the absorbent core are arranged in a U-shape.

[0020] Furthermore: the pressure points arranged in a U-shape are 10-20mm away from the absorber core.

[0021] Furthermore: there are 12 spandex filaments, 9 at the front end and 3 at the rear end.

[0022] Furthermore, the stretch ratio of the front spandex filament is 1.4-1.8.

[0023] Furthermore, the resilience of the front spandex filament is less than that of the rear spandex filament.

[0024] By adopting the aforementioned technical solution, the beneficial effects of the present invention are as follows:

[0025] 1. The diaper prepared by the method of this application has elasticity in both the front and back waistbands. By adjusting the arrangement of the spandex filaments, the spandex filaments at the front and back ends are arranged at a distance of 35-40mm. By applying glue to seal the ends of the spandex filaments, an air loop of 10mm-12mm is formed in the front and back waistbands. The waistband is soft, breathable, close-fitting and elastic, making it more comfortable to wear.

[0026] 2. After the spandex yarn at the end of the elastic waistband nonwoven fabric is sealed, a front and back elastic waistband area with one end unbonded is formed at both the front and back ends, which improves the softness of the product. In addition, the first spandex yarn at the end of the elastic waistband is 17.5-20mm away from the front and back ends of the diaper product, forming a bud structure of 17.5-20mm at both the front and back.

[0027] 3. This application eliminates the spandex yarn breakage process, which makes the product waistband more stretchable and the product has better overall integrity, making it less prone to holes.

[0028] 4. The elastic waistband fits between the two diaper bodies. After the diaper body is cut, the front spandex elastic waistband area is cut to the front of one product, and the rear spandex elastic waistband area is cut to the rear of the other product, so that both the front and rear of the product have stretching ability and improve the fit of the product.

[0029] 5. This application adopts an integrated online preparation method, which has high production efficiency.

[0030] 6. Furthermore, soft, fine-denier, water-repellent hot-air nonwoven fabric is laid in the same area of ​​the elastic waistband. After ultrasonic welding, the hot-air nonwoven fabric forms front and rear leak-proof pockets with certain liquid-repellent properties at the front and rear ends of the diaper product. The area covered by the hot-air nonwoven fabric can improve the softness of the product and reduce friction between the inside of the diaper product and the baby's skin.

[0031] 7. Due to the interval arrangement of the ultrasonic pressure rollers, the hot air nonwoven fabric forms accordion-like ventilation channels at the front and back ends of the product, improving the breathability of the waistband. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the elastic waistband in Embodiment 1 of the present invention;

[0033] Figure 2 This is a schematic diagram of the elastic waistband structure before folding after applying adhesive in step c of Embodiment 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of the elastic waistband preparation process in Embodiment 1 of the present invention;

[0035] Figure 4 This is a schematic diagram of the product structure according to Embodiment 1 of the present invention;

[0036] Figure 5 This is a schematic diagram of the elastic waistband preparation process in Embodiment 2 of the present invention;

[0037] Figure 6 This is a schematic diagram of the elastic waistband structure with hot air nonwoven fabric composited in Embodiment 2 of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of two uncut products in Embodiment 2 of the present invention. Detailed Implementation

[0039] Example 1

[0040] refer to Figures 1 to 4 A method for preparing a diaper with a front and back elastic bud structure includes the following preparation steps:

[0041] (1) The surface non-woven fabric is unwound and transported online, and hydrophobic spacers are laminated on both sides of the surface non-woven fabric online to form a non-woven fabric composite material with hydrophobic spacers on both sides.

[0042] (2) Online composite elastic waistband;

[0043] The preparation process of the elastic waistband is as follows:

[0044] a. Online unwinding and transmission of waistband nonwoven fabric 1;

[0045] b. Twelve spandex filaments are laid out in the transmission direction along the nonwoven fabric 1 around the waist. Each spandex filament consists of nine front spandex filaments 2 and three rear spandex filaments 3, with the front spandex filaments 2 and the rear spandex filaments 3 spaced 35mm apart. The resilience of the front spandex filaments is less than that of the rear spandex filaments, and the stretch ratio of the front spandex filaments is 1.4.

[0046] c. Apply hot melt adhesive 4 online to each of the spandex filaments. In the interval area between the front spandex filament 2 and the rear spandex filament 3, front waistband sealing adhesive 5 and rear waistband sealing adhesive 6 are arranged. The front waistband sealing adhesive is 10mm away from the nearest front spandex filament, and the rear waistband sealing adhesive is 10mm away from the nearest rear spandex filament. No adhesive is applied in this area, forming an air waistband. There is no adhesive spraying in the waistband fold area, making it softer.

[0047] d. Fold the non-woven fabric of the waistband in half to cover the spandex yarn and combine them into one piece to form an elastic waistband. When folding, the area without spandex yarn is folded over to cover the area with spandex yarn.

[0048] The elastic waistband is laminated between two diaper bodies, so that after slitting, the elastic waistband with the front spandex filament is cut to the front end of one diaper body, and the elastic waistband with the rear spandex filament is cut to the rear end of the other diaper body.

[0049] (3) Online composite leg band, hook and loop fastener;

[0050] (4) The diaper body is formed by online composite of the bottom layer and absorbent core 9 with the online transmission. The diaper body has a top layer, absorbent core and bottom layer stacked from top to bottom. The horizontal sides of the top layer have hydrophobic partitions.

[0051] (5) Cut into individual items, cut along the midline of the area between the front spandex filament and the rear spandex filament to obtain individual diapers with front and rear elastic bud structures.

[0052] Example 2

[0053] refer to Figures 5 to 7 A method for preparing a diaper with a front and back elastic bud structure includes the following preparation steps:

[0054] (1) The surface non-woven fabric is unwound and transported online, and hydrophobic spacers are laminated on both sides of the surface non-woven fabric online to form a non-woven fabric composite material with hydrophobic spacers on both sides.

[0055] (2) Online composite elastic waistband;

[0056] The preparation process of the elastic waistband is as follows:

[0057] a. Online unwinding and conveying of waistband nonwoven fabric;

[0058] b. Twelve spandex filaments are laid out in the nonwoven fabric of the waistband at intervals along the transmission direction. Each spandex filament consists of nine front spandex filaments and three rear spandex filaments, with the front and rear spandex filaments spaced 35-40mm apart. The stretch ratio of the front spandex filament is 1.6, and the resilience of the front spandex filament is less than that of the rear spandex filament.

[0059] c. Apply hot melt adhesive online to each of the spandex filaments. In the interval between the front spandex filament and the rear spandex filament, front waistband sealing adhesive and rear waistband sealing adhesive are provided. The front waistband sealing adhesive is 11mm away from the nearest front spandex filament, and the rear waistband sealing adhesive is 11mm away from the nearest rear spandex filament.

[0060] d. Fold the non-woven fabric of the waistband in half to cover the spandex yarn and combine them into one piece to form an elastic waistband. When folding, the area without spandex yarn is folded over to cover the area with spandex yarn.

[0061] The elastic waistband is laminated between two diaper bodies, so that after slitting, the elastic waistband with the front spandex filament is cut to the front of one diaper body and covers the front of the absorbent core by 11mm, and the elastic waistband with the rear spandex filament is cut to the rear of the other diaper body and covers the rear of the absorbent core by 11mm.

[0062] (3) Soft fine denier water-repellent hot air nonwoven fabric 7 is laminated online at the same position as the elastic waistband, and the hot air nonwoven fabric 7 is fixedly connected to the surface layer and the hydrophobic side edges on both sides by ultrasonic pressure rollers. The ultrasonic pressure roller pressure point 8 is 0.6mm wide and 1.5mm long. The gap between each pressure point 8 in the length direction is 2.5mm and the gap in the width direction is 10mm.

[0063] The hot air nonwoven fabric covering the absorbent core is not ultrasonically welded, and the ultrasonic pressure rollers closest to the absorbent core are arranged in a U-shape, with the U-shaped pressure points 10mm away from the absorbent core.

[0064] (4) Online composite leg band, hook and loop fastener;

[0065] (5) The diaper body is formed by online composite of the bottom layer and absorbent core 9 with the online transmission. The diaper body has a top layer, absorbent core and bottom layer stacked from top to bottom. The horizontal sides of the top layer have hydrophobic partitions.

[0066] (6) Cut into individual items, cut along the midline of the area between the front spandex filament and the rear spandex filament to obtain individual diapers with front and rear elastic bud structures.

[0067] The number of spandex threads at the waist of this invention can also be other values. The purpose of this invention can be achieved by spacing the spandex threads at the front and rear ends between 35-40mm. When the spacing is less than 35mm, the longitudinal dimension of the flower bud structure will be too small, which will result in the size of the breathable waistband being too small and affecting the overall breathability of the waistband. If it is greater than 40mm, the flower bud structure will be too large, which will cause wrinkles when wearing it and affect the comfort of wearing it.

[0068] The ultrasonic pressure roller has a pressure point width of 0.6-1.0 mm and a length of 1.5-2.5 mm. The length gap between each pressure point is 2.5-3.5 mm and the width gap is ≥10 mm. The purpose of this invention can be achieved within the above parameter range.

[0069] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should 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 a diaper with a front and rear elastic bud structure, characterized in that, The preparation steps include the following: (1) The surface non-woven fabric is unwound and transported online, and hydrophobic spacers are laminated on both sides of the surface non-woven fabric to form a non-woven fabric composite material with hydrophobic spacers on both sides. (2) Online composite elastic waistband; The preparation process of the elastic waistband is as follows: a. Online unwinding and transmission of non-woven waistband fabric; b. Several spandex filaments are laid out in the non-woven fabric of the waistband at intervals along the transmission direction. The spandex filaments are composed of several front spandex filaments and several rear spandex filaments, and the front spandex filaments and rear spandex filaments are arranged at intervals of 35-40mm. c. Apply hot melt adhesive online to each of the spandex filaments. In the interval between the front spandex filament and the rear spandex filament, front waistband sealing adhesive and rear waistband sealing adhesive are provided. The front waistband sealing adhesive is 10-12mm away from the nearest front spandex filament, and the rear waistband sealing adhesive is 10-12mm away from the nearest rear spandex filament. d. Fold the non-woven fabric of the waistband in half to cover the spandex yarn and combine them into one piece to form an elastic waistband. When folding, the area without spandex yarn is folded over to cover the area with spandex yarn. The elastic waistband is laminated between two diaper bodies, so that after slitting, the elastic waistband with the front spandex filament is cut to the front end of one diaper body, and the elastic waistband with the rear spandex filament is cut to the rear end of the other diaper body. (3) Online composite leg band, hook and loop fastener; (4) The diaper body is formed by online composite of the bottom layer and absorbent core, and the diaper body has a top layer, absorbent core and bottom layer stacked from top to bottom, and the top layer has hydrophobic side panels on both sides of the lateral direction. (5) Cut into individual items, cut along the midline of the area between the front spandex filament and the rear spandex filament to obtain individual diapers with front and rear elastic bud structures.

2. The method for preparing a diaper with a front and rear elastic bud structure according to claim 1, characterized in that: After step (2) and before step (3), soft fine denier water-repellent hot air nonwoven fabric is laminated online at the same position as the elastic waistband, and the hot air nonwoven fabric is fixedly connected to the surface layer and the hydrophobic side panels on both sides by ultrasonic pressure rollers.

3. The method for preparing a diaper with a front and rear elastic bud structure according to claim 2, characterized in that: The ultrasonic pressure roller has pressure points with a width of 0.6-1.0 mm and a length of 1.5-2.5 mm. The length gap between each pressure point is 2.5-3.5 mm, and the width gap is ≥10 mm.

4. The method for preparing a diaper with a front and rear elastic bud structure according to claim 2, characterized in that: The hot-air nonwoven fabric covering the absorbent core is not ultrasonically welded, and the ultrasonic pressure rollers closest to the absorbent core are arranged in a U-shape.

5. The method for preparing a diaper with a front and rear elastic bud structure according to claim 4, characterized in that: The pressure points, arranged in a U-shape, are 10-20mm away from the absorber core.

6. The method for preparing a diaper with a front and rear elastic bud structure according to claim 1, characterized in that: The spandex yarn consists of 12 strands, with 9 strands at the front end and 3 strands at the rear end.

7. The method for preparing a diaper with a front and rear elastic bud structure according to claim 1, characterized in that: The front spandex filament has a draw ratio of 1.4-1.

8.

8. The method for preparing a diaper with a front and rear elastic bud structure according to claim 1, characterized in that: The resilience of the front spandex yarn is less than that of the rear spandex yarn.

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