A one-step forming process for welding and cutting the waistline of a pull-up diaper

Abstract

The present application relates to sanitary product production equipment field, specifically to a kind of pull-up diaper waistband welding cutting one forming process, using a forming equipment, the forming equipment includes rack, a rotatable main shaft is arranged on the rack, rotatable rotating assembly is installed on the main shaft, rotatable cam assembly for guiding is installed on the main shaft, a plurality of adsorption box assemblies are evenly arranged on the circumferential surface of the rotating assembly, the rotating assembly between each adsorption box assembly is installed on the ultrasonic welding vibrator end;The rotating assembly between each adsorption box assembly is installed on the moving assembly that can reciprocate along rotating assembly axial direction;Each moving assembly is installed with blade profile roller that is adapted to welding, cutting processing with the vibrator end;The blade profile roller is connected with driving assembly that drives its rotation.This application solves the problem of insufficient welding precision and low efficiency of existing pull-up diaper waistband.

Description

Technical Field

[0001] This invention relates to the field of hygiene product manufacturing equipment, specifically to a one-time forming process for welding and cutting the waistband of pull-up trousers. Background Technology

[0002] In the production of pull-up diapers, the continuous waistband material is welded and separated into two different processes. However, this process has several drawbacks:

[0003] 1. Welding involves heating the material to a high temperature using a heating rod, which is then transferred to a hot-pressing roller. The waistband material is pressed together using a patterned roller and a plain roller, allowing multiple layers of material to adhere. Waistband products manufactured using this hot-pressing welding method have a rough texture, are slow to weld, and consume a lot of energy.

[0004] 2. Welding and cutting processes are distributed across two different steps, requiring more expensive manufacturing equipment. Furthermore, better coordination between these different processes is needed to ensure that the cutting process can accurately cut into the gap between the two weld points. Therefore, the processing technology is advanced, and a longer product length is required, resulting in unnecessary waste of raw materials.

[0005] 3. The product specifications and sizes that can be adapted are limited. For each product with a different waist length, a different outer diameter cutter roller is required, which increases both manufacturing and maintenance costs.

[0006] Therefore, there are also devices on the market that integrate these two processes into one place, such as the ultrasonic processing device for sanitary products shown in Chinese patent application CN111572030 A, which includes: a support frame; a rotating body rotatably mounted on the support frame; a negative pressure adsorption structure located on the outer edge of the rotating body for adsorbing the processed sanitary products onto the outer edge of the rotating body; and a welding and cutting composite mechanism located on the outer edge of the rotating body that can reciprocate along the rotation axis to weld and cut the products. The welding and cutting composite mechanism includes an ultrasonic welding roller 501 and an ultrasonic cutting roller 502, which are arranged front and back along the rotation axis. First, the ultrasonic welding roller performs the welding action, and then the ultrasonic cutting roller, located behind the welding roller, completes the cutting action.

[0007] This structure actually still separates welding and cutting. Cutting is done by ultrasonic welding rollers, and then by cutting rollers that follow. In reality, there is still a time gap between the two processes. After welding and before the cutting rollers arrive, the welding position is affected by changes in shape and will still have a certain positional shift, especially on high-speed rotating bodies. Because the waistband of the pull-up diaper has a corresponding elastic body arrangement, the processing precision is insufficient, and it is impossible to further reduce the size of the welding position on the sanitary product. Summary of the Invention

[0008] Therefore, the present invention provides a one-time forming process for welding and cutting the waistband of pull-up pants, which solves the problem that the welding size of the existing pull-up pants waistband cannot be further reduced.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0010] A one-step forming process for welding and cutting the waistband of pull-up trousers is disclosed, employing a forming device. The forming device includes a frame, on which a rotatable main shaft is mounted. A rotating assembly that rotates with the main shaft is mounted on the main shaft, and a cam assembly rotatably mounted on the main shaft for guidance is also included.

[0011] A plurality of adsorption box assemblies are evenly arranged around the circumference of the rotating assembly, and an ultrasonic welding transducer end is installed on the rotating assembly between each adsorption box assembly.

[0012] Each adsorption box assembly has a movable component installed on the rotating assembly that can reciprocate along the axis of the rotating assembly.

[0013] Each of the moving components is equipped with a toothed roller with blades that is adapted to be welded and cut at the end of the vibrator. The toothed roller with blades is connected to a drive component that drives it to rotate. The toothed roller with blades includes a cutting roller located on the center line of the end of the vibrator and welding pressure rollers arranged on the surfaces of both ends of the cutting roller.

[0014] The molding process includes the following steps:

[0015] ① According to the assembly line layout, the forming equipment has an input end and an output end. The pull-up trouser waistband products are input through the input end and adsorbed and wrapped around the rotating component by the adsorption box assembly. The position between adjacent adsorption box assemblies is the connection point of two pull-up trouser waistband products. The vibrator end is located below the connection point. The reciprocating motion direction of the moving component is the center of symmetry of the two pull-up trouser waistband products.

[0016] ② Define the forming equipment between the input and output ends as having n sets of welding and cutting components m consisting of an oscillator end, a moving component, and a toothed roller with blades, namely m1, m2, m3...mn. The time for m1 to move from the current position to the position of mn is t, which is the time for each moving component to complete one reciprocating motion. During this process, the toothed roller with blades completes the waist welding and cutting action at the current position under the action of the moving component.

[0017] ③ After welding and cutting are completed, the pull-up pants product at position m1 is output from the output end and enters the next process; the welding and cutting component m1 enters the next cycle, and the subsequent welding and cutting components m2, m3...mn operate in the same way as the welding and cutting component m1 according to the structure of the cam component during the operation of m1, so as to realize the welding and cutting operation of each welding and cutting component m in sequence and cycle.

[0018] Preferably, each of the moving components includes a base fixed on the rotating component, a moving frame movably arranged on the base via an axial slide rail assembly, and the toothed roller with blades mounted on the moving frame.

[0019] Preferably, the drive assembly includes a motor mounted on the movable frame and a belt drive assembly connected to the motor, wherein the toothed roller with blades is driven to rotate by the belt drive assembly.

[0020] Preferably, the rotating assembly is provided with a plurality of radial supports, and each radial support is equipped with a radial moving seat for the moving frame to move radially along the rotating assembly. The radial moving seat is connected to the moving frame through a radial slide rail assembly.

[0021] Preferably, pressure rollers are installed on the movable frame located on both sides of the toothed roller with blades. When the movable frame extends between the two adsorption box assemblies, the two pressure rollers abut against the waistband to be processed.

[0022] Preferably, the pressure roller is connected to the toothed roller with blades.

[0023] Preferably, the pressure roller is not connected to the toothed roller with blades.

[0024] Preferably, the two welding rollers are provided with oblique teeth, and the oblique teeth on both sides are symmetrically arranged. When the welding rollers come into contact with the waist, the oblique teeth on both sides drive the waist to unfold and flatten outward.

[0025] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0026] This technical solution adopts a one-step welding and cutting forming method, with welding and cutting performed simultaneously without any distinction between the two. During forming, the number of welding and cutting components is adjusted according to the layout of the equipment production line. As a single pull-up trouser product moves from the input end to the output end, the welding and cutting operations at the waistband are completed. The moving component at this point also completes one extension and resetting process. During production line operation, the equipment performs compaction, welding, and cutting of the pull-up trouser waistband simultaneously. This design makes the equipment production line layout more flexible. Different numbers of welding and cutting components can be equipped according to different parameters such as the positional interval between the input and output ends and the diameter of the rotating components. It is even possible to adapt multiple output ends in the same forming equipment to form multiple output production lines to enter subsequent processes, thereby increasing the rotation speed of the forming equipment and thus improving welding and cutting efficiency.

[0027] The molding equipment adopted features an integrated welding and cutting structure with bladed toothed rollers. Welding and cutting are performed simultaneously, and the spacing between weld points can be 6 mm or less, forming small-sized waist-shaped weld points. The cutting line position is less prone to deviation. In the synchronous cutting state during assembly line production, it is ensured that the weld points on both sides of the waist of the cut product are evenly distributed. The resulting product is more aesthetically pleasing, and the welded joints have a softer feel. The equipment has a high degree of integration, reducing the length of the assembly line compared to traditional equipment, thereby saving raw materials and significantly reducing production costs. It also reduces the time required to adjust the equipment when changing product specifications, making it highly practical. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the device according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the moving component in an embodiment of the present invention;

[0030] Figure 3 This is a diagram showing the welding and cutting positions of the waistband of the pull-up pants in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram showing the layout of the molding equipment production line in an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram showing the layout of another production line of the molding equipment in this embodiment of the invention.

[0033] Reference numerals: 1. Main shaft; 2. Rotating assembly; 21. Radial support; 211. Radial moving seat; 212. Radial slide rail assembly; 3. Cam assembly; 31. Guide groove; 4. Adsorption box assembly; 5. Vibrator end; 51. Ultrasonic assembly; 6. Moving assembly; 61. Base; 62. Axial slide rail assembly; 63. Moving frame; 631. Arm body; 7. Toothed roller with blade; 71. Cutting roller; 72. Welding pressure roller; 721. Helical toothed part; 73. Motor; 74. Belt drive assembly; 75. Pressure roller; 76. Pressure roller. Detailed Implementation

[0034] The following will describe in detail the implementation of the present invention with reference to specific embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0035] Example

[0036] refer to Figures 1 to 3 A one-step forming process for welding and cutting the waistband of pull-up trousers is disclosed, which uses a forming device. The forming device includes a frame, on which a rotatable main shaft 1 is mounted. The main shaft 1 can rotate under the action of an external driving force. A rotating component 2 that can rotate with it is mounted on the main shaft 1. A cam component 3 that is rotatably mounted on the main shaft 1 for guidance is also mounted on the main shaft 1. Specifically, the cam component 3 is located inside the rotating component 2. The rotating component 2 is driven by the main shaft 1 and rotates accordingly, while the cam component 3 is in a fixed state. Several adsorption box components 4 are evenly distributed around the circumference of the rotating component 2. The number of adsorption box components 4 is arranged according to the requirements and is not limited here. An ultrasonic welding transducer end 5 is installed on the rotating component 2 between each adsorption box component 4. The transducer end 5 is connected to an ultrasonic component 51 that drives it. That is, the adsorption box components 4, the transducer end 5, and the corresponding ultrasonic component 51 can all move around the rotating component 2 in a circumferential direction. This technical solution does not specifically describe the ultrasonic component 51, the adsorption box component 4, the cam component 3, and other conventional accessories in the art. Please refer to the applicant's earlier applications.

[0037] During molding, refer to Figure 4 This includes the following steps:

[0038] ① According to the assembly line layout, the forming equipment has an input end and an output end. The pull-up trouser waistband product is input through the input end and adsorbed and wrapped around the rotating component 2 by the adsorption box assembly 4. The position between adjacent adsorption box assemblies 4 is the connection point of two pull-up trouser waistband products. The vibrator end 5 is located below the connection point. The reciprocating motion direction of the moving component 6 is the center of symmetry of the two pull-up trouser waistband products.

[0039] ② Define the forming equipment between the input end and the output end as having n sets of welding and cutting components m consisting of an oscillator end 5, a moving component 6, and a toothed roller with blades 7, which are m1, m2, m3...mn respectively. The time for m1 to move from the current position to the mn position is t, which is the time for each moving component 6 to complete one reciprocating motion. During this process, the toothed roller with blades 7 completes the waist welding and cutting action at the current position under the action of the moving component 6.

[0040] ③ After welding and cutting are completed, the pull-up pants product at position m1 is output from the output end and enters the next process; the welding and cutting component m1 enters the next cycle, and the subsequent welding and cutting components m2, m3...mn operate in the same way as the welding and cutting component m1 according to the structure of the cam component 3 during the operation of m1, so as to realize the welding and cutting operation of each welding and cutting component m in sequence and cycle.

[0041] This technical solution adopts a one-time forming method of welding and cutting. Welding and cutting are carried out simultaneously without distinction between the front and back. During the forming process, the number of welding and cutting components is equipped according to the layout of the equipment production line. During the process of a single pull-up trouser product moving from the input end to the output end, the welding and cutting operations at the waist are completed. The moving component 6 at this point also completes a process of extension and resetting. During the production line operation, the equipment performs the compaction, welding and cutting of the pull-up trouser waist at the same time.

[0042] This design allows for more flexible production line layout. Different numbers of welding and cutting components can be configured based on specific parameters such as the positional interval between the input and output ends and the diameter of the rotating component 2. It can even accommodate multiple output ends within the same forming equipment, forming multiple output production lines to enter subsequent processes, thereby increasing the rotational speed of the forming equipment and thus improving welding and cutting efficiency. (Reference) Figure 5 In this case, the size of the forming equipment is increased, and the number of welding and cutting components on it is increased and divided into two groups. The rotation speed of the forming equipment is increased to supply material to both output ends, meaning that each group of welding and cutting components performs two reciprocating cycles during a single operation. It should be noted that this embodiment only shows the arrangement of one or two groups of welding and cutting components, but it is not limited to this. Continuous circulating production lines and multi-output end feeding are also included in this technical solution.

[0043] In this embodiment, a movable component 6 capable of reciprocating along the axial direction of the rotating component 2 is installed on the rotating component 2 between each adsorption box assembly 4, such as... Figure 1As shown, the upper moving component 6 is in the reset state, while the lower moving component 6 is in the extended state. Each moving component 6 includes a base 61 fixed on the rotating component 2 and a moving frame 63 movably arranged on the base 61 via an axial slide rail assembly 62. During operation, a guide groove 31 is formed on the outer surface of the cam assembly 3, and the moving component 6 is provided with a guide block adapted to the guide groove 31. Thus, as the rotating component 2 rotates, the guide block moves within the guide groove 31, causing the moving component 6 to reciprocate as the trajectory of the guide groove 31 changes.

[0044] In this embodiment, each of the moving components 6 is equipped with a bladed toothed roller 7 that is adapted to be welded and cut to the vibrator end 5. The bladed toothed roller 7 is connected to a drive component that drives its rotation. Structurally, the drive component includes a motor 73 mounted on the moving frame 63 and a belt drive component 74 that is driveably connected to the motor 73. The bladed toothed roller 7 is driven to rotate by the belt drive component 74. The belt drive component 74 is a two-stage transmission. The power is transmitted from the motor 73 through two sets of drive belts and pulleys to the bladed toothed roller. In order to ensure transmission accuracy and facilitate adjustment of the transmission structure, an adjustable pressure wheel 75 is also configured on the drive belt. Structurally, the bladed toothed roller 7 has a transmission structure on both sides to ensure stable transmission on both sides. Structurally, the movable frame 63 consists of two symmetrical arms 631. The toothed roller 7 with blades is mounted on the movable frame 63, specifically located at the center of one end of the adsorption box assembly 4, that is, on the symmetrical center line of the two arms 631.

[0045] Structurally, the toothed roller 7 with blades includes a cutting roller 71 located on the center line of the vibrator end 5 and welding pressure rollers 72 arranged on the surfaces of both ends of the cutting roller 71. Structurally, the two welding pressure rollers 72 are provided with helical teeth 721, symmetrically arranged on both sides. When the welding pressure rollers 72 contact the waistband, the helical teeth 721 on both sides cause the waistband to unfold and flatten outwards. The helical teeth 721 can create an outward unfolding tendency in the waistband during the pressing process, and can form corresponding toothed patterns at the waistband, improving aesthetics while also allowing for direct comparison of the accuracy of the cutting line after processing, checking whether it is located at the center of the toothed patterns on both sides, facilitating quality inspection of the processed product. This technical solution adopts an integrated welding and cutting structure with a toothed roller 7 with blades. Welding and cutting are performed simultaneously. The spacing w of the weld points can be 6 mm or less, forming small waist-shaped weld points. The cutting line position is not prone to deviation. In the synchronous cutting state during assembly line production, it is ensured that the weld points on both sides of the waist of the cut product are evenly distributed. The resulting product is more beautiful, and the welded joints have a softer feel. The equipment has a high degree of integration. Compared with traditional equipment, it reduces the length of the assembly line layout, thereby saving raw materials and greatly reducing production costs. It also reduces the time required to adjust the equipment when changing product specifications, making it highly practical.

[0046] In this embodiment, the rotating component 2 is provided with a plurality of radial supports 21, and each radial support 21 is equipped with a radial moving seat 211 for the moving frame 63 to move radially along the rotating component 2. The radial moving seat 211 is connected to the moving frame 63 through a radial slide rail assembly 212. The radial position of the moving frame 63 in the rotating component 2 can be adjusted by the radial moving seat 211 so as to move the radial position up and down, thereby adapting to the production of pull-up pants products of different specifications and lengths and improving the versatility of the product.

[0047] In this embodiment, pressure rollers 76 are installed on the movable frame 63 located on both sides of the toothed roller 7. When the movable frame 63 extends between the two adsorption box assemblies 4, the two pressure rollers 76 abut against the waistband to be processed. When the moving component 6 moves and the toothed roller 7 with blades is in action for welding and cutting, the pressure rollers 76 on both sides can press down on the two sides of the vibrator end 5 (i.e., the welding position), so that the waistband of the pull-up pants at the welding position is in contact with the surface of the vibrator end 5, while the two sides are concave due to the action of the pressure rollers 76. This structure is designed for pull-up pants waistbands with elastic elements, which can reduce the interference of the elastic elements on the welding and cutting process. It works in conjunction with the welding pressure roller 72 to ensure that the pull-up pants waistband is fully unfolded and evenly distributed during welding and cutting. Since the pull-up pants waistband is a folded and stacked structure at this time, and there is no limit between the front waistband and the back waistband before welding, the pressure rollers 76 can fully unfold the two layers of waistband on both sides of the welding position, avoiding the situation where the welding pressure roller 72 only contacts the waistband on one side surface during operation, which would cause the two layers of waistband to shift. In specific design, the pressure roller 76 can be connected to the toothed roller 7 with blades, or the pressure roller 76 can be disconnected from the toothed roller 7 with blades. The difference in this structure depends on the size of the pressure roller 76 and the friction of its outer surface. When the rolling of the pressure roller 76 is smooth enough and the surface friction is sufficient, it can be driven without being driven. As the moving frame 63 moves, it can ensure that the friction between its surface and the surface of the pull-up pants waistband drives it to rotate and achieve rolling pressure. In this embodiment, the pressure roller 76 is connected to the toothed roller 7 with blades, which allows the pressure roller 76 and the toothed roller 7 to move in tandem, making the equipment operation more stable. However, a structure where they are not connected is also one of the possible implementation methods of this technical solution.

[0048] 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 one-time forming process for welding and cutting the waistband of pull-up trousers, characterized in that: The forming equipment is used for processing. The forming equipment includes a frame on which a rotatable spindle (1) is mounted. A rotating assembly (2) that can rotate with the spindle (1) is mounted on the spindle (1). A cam assembly (3) that is rotatably mounted on the spindle (1) for guidance is also mounted on the spindle (1). A plurality of adsorption box assemblies (4) are evenly arranged around the circumferential surface of the rotating assembly (2), and an ultrasonic welding transducer end (5) is installed on the rotating assembly (2) between each adsorption box assembly (4). A movable component (6) capable of reciprocating along the axis of the rotating component (2) is installed on the rotating component (2) between each adsorption box assembly (4); Each of the moving components (6) is equipped with a blade toothed roller (7) adapted to the vibrator end (5) for welding and cutting. The blade toothed roller (7) is connected to a drive component that drives it to rotate. The blade toothed roller (7) includes a cutting roller (71) located on the center line of the vibrator end (5) and welding pressure rollers (72) arranged on the surfaces of both ends of the cutting roller (71). The molding process includes the following steps: ① According to the assembly line layout, the forming equipment has an input end and an output end. The pull-up pants waistband product is input through the input end and adsorbed and wrapped around the rotating component (2) by the adsorption box assembly (4). The position between adjacent adsorption box assemblies (4) is the connection point of two pull-up pants waistband products. The vibrator end (5) is located below the connection point. The reciprocating motion direction of the moving component (6) is the symmetrical center of the two pull-up pants waistband products. ② The forming equipment between the input end and the output end is defined as having n sets of welding and cutting components m consisting of an oscillator end (5), a moving component (6), and a toothed roller with blades (7), which are m1, m2, m3...mn respectively. The time for m1 to move from the current position to the position of mn is t, which is the time for each moving component (6) to perform one reciprocating motion. During this process, the toothed roller with blades (7) completes the waist welding and cutting action at the current position under the action of the moving component (6). ③ After welding and cutting are completed, the pull-up pants product at position m1 is output from the output end and enters the next process; the welding and cutting component m1 enters the next cycle, and the subsequent welding and cutting components m2, m3...mn operate in the same way according to the structure of the cam component (3) during the operation of m1, so as to realize the welding and cutting operation of each welding and cutting component in sequence and cycle.

2. The one-time forming process for welding and cutting the waistband of pull-up trousers according to claim 1, characterized in that: Each of the moving components (6) includes a base (61) fixed on the rotating component (2) and a moving frame (63) movably arranged on the base (61) via an axial slide rail assembly (62), and the blade toothed roller (7) is mounted on the moving frame (63).

3. The one-time forming process for welding and cutting the waistband of pull-up trousers according to claim 2, characterized in that: The drive assembly includes a motor (73) mounted on the movable frame (63) and a belt drive assembly (74) connected to the motor (73). The toothed roller (7) with blades is driven to rotate by the belt drive assembly (74).

4. The one-time forming process for welding and cutting the waistband of pull-up trousers according to claim 2, characterized in that: The rotating assembly (2) is provided with a plurality of radial supports (21), and each radial support (21) is equipped with a radial moving seat (211) for the moving frame (63) to move radially along the rotating assembly (2). The radial moving seat (211) is connected to the moving frame (63) through a radial slide rail assembly (212).

5. The one-time forming process for welding and cutting the waistband of pull-up trousers according to claim 2, characterized in that: Pressure rollers (76) are installed on the movable frame (63) located on both sides of the toothed roller (7). When the movable frame (63) extends between the two adsorption box assemblies (4), the two pressure rollers (76) abut against the waistband to be processed.

6. The one-time forming process for welding and cutting the waistband of pull-up trousers according to claim 5, characterized in that: The pressure roller (76) is connected to the toothed roller (7) with blades.

7. The one-time forming process for welding and cutting the waistband of pull-up trousers according to claim 5, characterized in that: The pressure roller (76) is not connected to the toothed roller (7) with blades.

8. A one-time forming process for welding and cutting the waistband of pull-up trousers according to any one of claims 1-7, characterized in that: The two welding rollers (72) are provided with helical teeth (721), and the helical teeth (721) on both sides are symmetrically arranged. When the welding rollers (72) come into contact with the waist, the helical teeth (721) on both sides drive the waist to unfold and flatten outward.

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