Totally glue-free waistline pull-on diaper and manufacturing method

Abstract

The application provides a manufacturing method of a completely glue-free waist circumference pull-up diaper, which comprises the following steps: feeding, feeding and sequentially stacking an upper sheet material, an elastic component and a lower sheet material to form a stacked structure; tension roller pre-fixing, performing elastic stretching on the three stacked sheet materials through two groups of composite pressure rollers to form a tension section, performing ultrasonic spot welding on the tension section through an ultrasonic spot welding device to pre-fix, performing composite roller pressing on the pre-fixed tension section and outputting; ultrasonic welding: performing complete ultrasonic welding fixing on the pre-fixed tension section through an ultrasonic welding device to form a composite belt material after welding; and the application further provides a completely glue-free waist circumference pull-up diaper, wherein the pull-up diaper is combined with a waist circumference finished product prepared according to the above manufacturing method. The elastic waist circumference finished product prepared by the application has good integrity, flatness and uniformity, and can avoid the misalignment or wrinkle phenomenon of the three sheet materials before welding fixing, thereby further improving the product quality.

Description

Technical Field

[0001] This invention relates to the field of hygiene products, and in particular to a completely glue-free waistband pull-up trousers and its manufacturing method. Background Technology

[0002] With societal progress and the increasing demand for hygiene products, as well as higher requirements for the comfort of hygiene products, disposable hygiene products such as diapers and pull-up pants are equipped with elastic waistbands. However, the previous manufacturing process for elastic waistbands relied entirely on adhesive bonding. For example, an elastic component was placed between the upper and lower sheets and fixed together with adhesive. However, the adhesive bonding would cause the entire waistband to harden, thus affecting the comfort of wearing it!

[0003] To improve the comfort of elastic waistbands, existing technologies have also improved the manufacturing process. One method is to eliminate all glue used in the elastic waistband, relying entirely on hot-press welding points (formed by heat pressing) or ultrasonic welding points (formed by ultrasonic welding) to fix the elastic components between the upper and lower sheets, making the elastic waistband of the wearable item very soft. However, existing technologies have the following problems: the elastic components are in an uncontrolled free state before ultrasonic welding, and their position is easily affected by other external factors (such as processing accuracy, vibration, and the distance between the elastic components and the sheet bonding points). This can cause misalignment, unevenness, and other problems with the elastic components after hot pressing or ultrasonic welding, seriously affecting the product's appearance and quality. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention proposes a method for manufacturing a completely glue-free waistband pull-up trouser and the pull-up trouser itself.

[0005] To address the aforementioned technical problems, the present invention provides a solution: a method for manufacturing a completely adhesive-free waistband pull-up trouser, comprising the following steps:

[0006] S1: Feeding, feeding the upper sheet, elastic component and lower sheet respectively and stacking them in sequence to form a stacked structure;

[0007] S2: Tensioning roller pressing pre-fixing, the three-layer sheet after stacking is elastically stretched by two sets of composite pressure rollers to form a tension section, the tension section is pre-fixed by ultrasonic spot welding by an ultrasonic spot welding device, and the pre-fixed tension section is compound roller pressed and output;

[0008] S3: Ultrasonic welding: The pre-fixed tension section springs back to its original position and is then completely ultrasonically welded and fixed by an ultrasonic welding device to form a welded composite strip.

[0009] S4: Cutting the finished product: Cut the welded composite strip to obtain a completely glue-free waistband finished product.

[0010] As a further improvement of the present invention: in step S2, the process of elastically stretching the stacked three-layer sheet through two sets of composite pressure rollers to form a tensioning section includes:

[0011] The second composite pressure roller at the rear end has a higher speed than the first composite pressure roller at the front end, creating a speed difference. The three-layer sheet is elastically stretched by the composite pressure rollers with different speeds to form a tension section.

[0012] As a further improvement of the present invention: the speed of the second composite roller located at the rear end is higher than the speed of the first composite roller located at the front end, forming a speed difference, further includes,

[0013] The tension signal of the tensioned section is detected by a tension detection device, and the speed difference is adjusted based on the tension signal.

[0014] As a further improvement of the present invention: the tension detection device includes a base, a pressure sensor fixed on the base, a spring connected to the pressure sensor, a roller frame connected to the spring, and a tension roller rotatably mounted on the roller frame.

[0015] As a further improvement of the present invention: the ultrasonic spot welding device includes a retractable welding plate, five columnar welding heads mounted on the welding plate, and a support plate disposed opposite to the welding plate.

[0016] A completely glue-free waistband pull-up trousers, wherein the pull-up trousers are laminated with a finished waistband manufactured according to the above-described manufacturing method.

[0017] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0018] The present invention relates to a completely adhesive-free waistband pull-up pants and its manufacturing method. The method involves feeding an upper sheet, an elastic component, and a lower sheet separately and stacking them sequentially to form a layered structure. The stacked three sheets are then elastically stretched using two sets of composite pressure rollers to form a tension section. This tension section is pre-fixed by ultrasonic spot welding using an ultrasonic spot welding device. The pre-fixed tension section is then subjected to composite roller pressing and output. The pre-fixed tension section springs back to its original position and is then completely ultrasonically welded to form a welded composite strip. This welded composite strip is then cut to obtain a completely adhesive-free waistband product. This results in a waistband product with excellent integrity, flatness, and uniformity, preventing misalignment or wrinkles in the three sheets before welding, thus further improving product quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the glue-free waistband production equipment according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the glue-free tension detection device according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the welding plate in an embodiment of the present invention.

[0022] Figure 4 This is a flowchart illustrating the manufacturing method of the completely glue-free waistband pull-up pants according to an embodiment of the present invention.

[0023] In the diagram: 1. Upper sheet; 2. Elastic component; 3. Lower sheet; 4. Tensioning section; 5. Finished waistband; 11. First feeding roller; 12. Second feeding roller; 13. Third feeding roller; 14. First composite pressure roller group; 15. Second composite pressure roller group; 16. Guide roller; 20. Limiting ring; 30. First tension detection device; 31. Seat; 32. Pressure sensor; 33. Spring; 34. Roller frame; 35. Tension roller; 40. Ultrasonic spot welding device; 41. Welding plate; 41a. Welding head; 42. Support plate; 50. Second tension detection device; 60. Ultrasonic welding device; 70. Welding bottom roller; 80. Cutting mechanism. Detailed Implementation

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Example

[0025] Figure 1 This is a schematic diagram of the structure of the glue-free waistband production equipment according to an embodiment of the present invention. The glue-free waistband production equipment is used to produce elastic waistbands for hygiene products such as diapers, pull-up pants, and sanitary napkins. By bonding the elastic component 2 between the upper sheet 1 and the lower sheet 3 and fixing it by ultrasonic welding, a composite strip is formed. Then, the welded composite strip is cut by the cutting mechanism 80 to form the finished waistband 5.

[0026] The glue-free waistband production equipment includes a feeding roller set at the front section for unwinding and feeding the upper sheet 1, elastic component 2, and lower sheet 3 respectively; a composite pressure roller set set at the middle section for pressing and bonding the three layers of sheets; an ultrasonic welding device 60 set at the rear section for ultrasonically welding the pressed and bonded three layers of sheets to form a composite strip; and a cutting mechanism 80 for cutting the composite strip to form the finished waistband 5.

[0027] The first feeding roller 11 is used to transport the upper sheet 1, the second feeding roller 12 is used to transport the elastic component 2, and the third feeding roller 13 is used to transport the lower sheet 3. The three layers of sheets are respectively transported by the feeding rollers to the composite pressure roller group for roll pressing and bonding. There are two sets of composite pressure roller groups. The three layers of sheets enter through the first composite pressure roller group 14 and exit through the second composite pressure roller group 15. The two sets of composite pressure roller groups have different rotational speeds. The rotational speed of the second composite pressure roller group 15, located at the rear, is higher than that of the first composite pressure roller group 14. Through the speed difference between the two sets of composite pressure roller groups, the three layers of sheets are elastically stretched in a section located between the two sets of composite pressure roller groups to form a tension section 4. After being tensioned, the three layers of sheets are rolled by the second composite pressure roller to achieve a high degree of fit, avoiding large misalignment of the three layers of sheets during pressing and bonding, and improving the fit of the composite strip formed after roll pressing. The tensioned composite strip is then welded by the ultrasonic welding device 60 to make the welded parts more uniform and firm.

[0028] The outer sides of the two sets of composite pressure rollers are respectively provided with limiting rings 20 for guiding the input and output of the sheet to prevent it from deviating. The limiting rings 20 are provided with strip-shaped slots that allow the sheet to pass through smoothly, so as to ensure that the sheet has good flatness when it is input and output.

[0029] An ultrasonic welding device 60 is located at the rear end of the second composite pressure roller group 15 and is used to perform comprehensive ultrasonic welding on the composite strip after it has been pressed by the tension rollers. A welding bottom roller 70 is located on the opposite side of the ultrasonic welding device 60. After being pressed by the tension rollers, the composite strip passes over the welding bottom roller 70, and the welding plate 41 of the ultrasonic welding device 60 applies pressure towards the welding bottom roller 70 to weld and fix the composite strip. The welded and fixed composite strip is then cut by the cutting mechanism 80 to form the waistband finished product 5.

[0030] Before the ultrasonic welding device 60, the composite strip is in an unwelded and fixed state. In order to reduce the offset of the three layers of the composite strip caused by the setting error of multiple rollers (including feeding rollers, composite rollers or other guide rollers 16), and to further ensure the uniform and flat composite fixation of the three layers of the strip, it is necessary to pre-fix it by the ultrasonic spot welding device 40 before the ultrasonic welding device 60 performs complete welding. The ultrasonic spot welding device 40 is preferably set between the first composite pressure roller group 14 and the second composite pressure roller group 15. That is, the pre-fixing operation of the composite strip is completed under its tension state. Under the tension state, the three layers of the composite strip are evenly laid and stacked. At this time, the spot welding pre-fixing by the ultrasonic spot welding device 40 can keep the evenly laid and stacked three layers of the strip in a good state and achieve the best positioning effect.

[0031] See Figure 3In this embodiment, the ultrasonic spot welding device 40 includes a retractable welding plate 41, five columnar welding heads 41a mounted on the welding plate 41, and a support plate 42 disposed opposite to the welding plate 41. The composite strip passes between the support plate 42 and the welding plate 41. The composite strip passes sequentially through a first composite pressure roller group 14 and a second composite pressure roller group 15. The rotational speed of the second composite pressure roller group 15 is higher than that of the first composite pressure roller group 14 to form a speed difference, so that the composite strip located between the two composite pressure roller groups is elastically stretched to form a tension section 4. The welding plate 41 presses the composite strip towards the support plate 42. After the welding heads 41a pre-fix the composite strip in the tension section 4 by five-point welding, it is rolled out by the second composite pressure roller group 15 and elastically recovers. When it passes over the welding bottom roller 70, it is completely welded and fixed by the ultrasonic welding device 60, thereby ensuring that the welded composite strip is more uniform and firm.

[0032] In this embodiment, the tensioning section 4 of the composite strip is achieved through the speed difference between two sets of composite pressure rollers. To ensure that the tensioning section 4 is within the optimal tension range, precise control of the rotational speed of the two sets of composite pressure rollers is required. Therefore, a tension detection device is provided between the first composite pressure roller group 14 and the second composite pressure roller group 15 to detect the tension of the tensioning section 4. The tension detection device detects the tension signal, and the composite pressure roller group adjusts its rotational speed based on this tension signal. For example, the rotational speed of the first composite pressure roller group 14 is fixed, while the rotational speed of the second composite pressure roller group 15 is the target for adjustment. An optimal threshold is set for the tension signal. When the detected tension value of the tensioning section 4 is less than the optimal threshold range, the rotational speed of the second composite pressure roller group 15 increases; conversely, when the detected tension value of the tensioning section 4 is greater than the optimal threshold range, the rotational speed of the second composite pressure roller group 15 decreases.

[0033] See Figure 2 The tension detection device includes a base 31, a pressure sensor 32 fixed on the base 31, a spring 33 connected to the pressure sensor 32, a roller frame 34 connected to the spring 33, and a tension roller 35 rotatably mounted on the roller frame 34. The tensioning section 4 is offset relative to the composite pressure roller group, bypassing the tension roller 35, and forms an elastic tension through the spring 33, feeding back the elastic tension value to the pressure sensor 32 to form a corresponding tension value.

[0034] Preferably, two tension detection devices are provided. The first tension detection device 30 is located near the first composite pressure roller group 14 and is used to detect the tension value at the front end of the tension section 4. The second tension detection device 50 is located near the second composite pressure roller group 15 and is used to detect the tension value at the rear end of the tension section 4. By comparing the two tension values, the uniformity of the elastic stretching of the tension section 4 can be detected. If an abnormality is detected, an alert can be issued in a timely manner.

[0035] Two guide rollers 16 are positioned between two tension detection devices to ensure that the tensioning section 4 is in a straight position between the two guide rollers 16, so that the ultrasonic spot welding device 40 can perform spot welding operations.

[0036] This invention also provides a method for manufacturing a completely adhesive-free waistband pull-up pant based on the above-mentioned adhesive-free waistband production equipment, comprising the following steps:

[0037] S1: Feeding material, feeding the upper sheet 1, elastic component 2 and lower sheet 3 respectively and stacking them in sequence to form a stacked structure;

[0038] For example, in this embodiment, the upper sheet 1, the elastic member 2 and the lower sheet 3 are conveyed by the first feeding roller 11, the second feeding roller 12 and the third feeding roller 13 respectively, and the upper sheet 1, the elastic member 2 and the lower sheet 3 are stacked in sequence to form a stacked strip.

[0039] S2: Tensioning roll pressing pre-fixing, the three-layer sheet after stacking is elastically stretched to form tension section 4, tension section 4 is pre-fixed by ultrasonic spot welding, and the pre-fixed tension section 4 is compound rolled and output;

[0040] For example, in this embodiment, the laminated strip formed in step S1 enters the first composite pressure roller group 14 and the second composite pressure roller group 15. The two composite pressure roller groups form a speed difference, and the laminated strip located between the two composite pressure roller groups is elastically stretched to form a tension section 4. Then, it is pre-fixed at multiple points by an ultrasonic spot welding device 40 set between the first composite pressure roller group 14 and the second composite pressure roller group 15, so as to ensure that the three layers of sheet remain uniformly aligned before complete welding, and at the same time lay flat and tightly to prevent misalignment and wrinkles.

[0041] S3: Ultrasonic welding: The pre-fixed tension section 4 springs back to reset and is then fully ultrasonically welded to form the welded composite strip.

[0042] S4: Cutting the finished product: Cut the welded composite strip obtained in step S3 to obtain a completely glue-free waistband finished product 5.

[0043] In this embodiment, the elastic waistband 5 produced by the above manufacturing method can be used in hygiene products such as diapers, pull-up pants, and sanitary napkins. It has good integrity, uniform and neat composite, uniform elasticity in all parts of the waistband 5, and is completely glue-free, thus providing better comfort.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0045] Although the above embodiments have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the above descriptions are merely embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent structural or procedural transformations made using the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for manufacturing completely glue-free waistband pull-up diapers, characterized in that: Includes the following steps: S1: Feeding, feeding the upper sheet, elastic component and lower sheet respectively and stacking them in sequence to form a stacked structure; S2: Tensioning roller pressing pre-fixing, the three-layer sheet after stacking is elastically stretched by two sets of composite pressure rollers to form a tension section, the tension section is pre-fixed by ultrasonic spot welding by an ultrasonic spot welding device, and the pre-fixed tension section is compound roller pressed and output; S3: Ultrasonic welding: The pre-fixed tension section springs back to its original position and is then completely ultrasonically welded and fixed by an ultrasonic welding device to form a welded composite strip. S4: Cutting the finished product: Cut the welded composite strip to obtain a completely glue-free waistband finished product; In step S2, the process of elastically stretching the stacked three-layer sheet through two sets of composite pressure rollers to form a tension section includes: The second composite pressure roller at the rear end has a higher speed than the first composite pressure roller at the front end, creating a speed difference. The three-layer sheet is elastically stretched by the composite pressure rollers with different speeds to form a tension section. The second composite roller located at the rear end has a higher speed than the first composite roller located at the front end, forming a speed difference. This also includes... The tension signal of the tensioned section is detected by a tension detection device, and the speed difference is adjusted based on the tension signal. The tension detection device includes a base, a pressure sensor fixed on the base, a spring connected to the pressure sensor, a roller frame connected to the spring, and a tension roller rotatably mounted on the roller frame. The ultrasonic spot welding device includes a retractable welding plate, five columnar welding heads mounted on the welding plate, and a support plate arranged opposite to the welding plate. Before the ultrasonic welding device performs complete welding, it is pre-fixed by an ultrasonic spot welding device. The ultrasonic spot welding device is set between the first composite pressure roller group and the second composite pressure roller group. When the composite strip is under tension, the three layers of sheet are evenly laid and stacked, and the ultrasonic spot welding device is used for spot welding pre-fixation.

2. A completely adhesive-free waistband pull-up trouser, characterized in that: The pull-up pants are laminated with a completely glue-free waistband manufactured according to the method of claim 1.

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