Shorts processing method

Abstract

The application discloses a kind of elastic belt material tensionless composite method, system and short pants processing method, belong to elastic cloth composite processing field.The composite method of the present application at least includes the following steps: configuration feeding mechanism is unwound to elastic material roll;Multiple tensioning rollers are arranged in the conveying path of elastic belt material to support, and the tension of elastic belt material is controlled by grade using tension control assembly;Control assembly is configured to include traction roller group and tension controller, and the conveying speed of elastic belt material is adjusted according to the detected tension signal, so that the tension of elastic belt material in the transmission section tends to be tensionless, and is tensionless with non-elastic sheet material Composite.The present application can realize the tensionless composite of elastic material and non-elastic material, meet the flatness requirement of material after composite, and can adjust production speed according to need, improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of elastic fabric composite processing technology, and more specifically, to a tension-free composite method, system, and shorts processing method for elastic strips. Background Technology

[0002] Disposable underwear, as a convenient and hygienic garment, has gained widespread popularity in the market in recent years. It is typically made of soft and comfortable materials, meeting the needs of people traveling, on business trips, in special occasions, or in emergencies. However, some problems often arise during the manufacturing process of disposable underwear, especially when elastic substrates are laminated with non-elastic skin-friendly sheets, the most prominent of which is curling.

[0003] Existing disposable underwear designs often use elastic substrates in key areas (such as the waistband and leg openings) to conform to the body's curves and improve wearing comfort. These elastic substrates have good elasticity and can adapt to people of different body types. The skin-friendly pad, on the other hand, is responsible for providing softness and comfort in direct contact with the skin, and is usually made of non-elastic or slightly elastic materials.

[0004] During the lamination process, due to the differences in physical properties between the elastic substrate and the inelastic skin-friendly sheet, especially their elasticity, the skin-friendly sheet may curl or curl at the edges. This is why existing diapers or pull-ups often experience significant shrinkage in the area where the absorbent core is bonded.

[0005] Patent ZL2011203107483 discloses a tension-free material composite unwinding device. This patented solution only adopts a passive unwinding form and cannot guarantee that there is no tension during the composite process.

[0006] Patent ZL202310993573.8 involves the unwinding of tension materials, but it is aimed at elastic rubber and can have a certain tension.

[0007] Patent ZL201520410167.5 discloses a tension-free composite slitting machine for elastic fabric. In this patent, the first unwinding mechanism is a tension-free unwinding mechanism composed of a first active filament splitting roller, a floating unwinding roller, a tension detection and control device, a first linkage filament splitting roller, and several guide rollers. It can realize the tension-free winding, unwinding, composite slitting production of elastic fabric.

[0008] Although the patent describes the use of a tension-free unwinding mechanism to unwind the elastic fabric, it does not describe how to achieve tension-free lamination during the final lamination process, as the unwinding process requires multiple transfers.

[0009] Especially for composite processing of highly elastic materials with low fineness, tension control during the stretching and traction process of the equipment is very difficult. When the lining is combined with highly elastic materials, if the tension is not controlled properly, problems such as material curling and unqualified cutting of the arc-shaped opening of the leg circumference are very likely to occur. This is also the problem that this patent aims to solve. Summary of the Invention

[0010] 1. The technical problem that the invention aims to solve The purpose of this invention is to overcome the problem that two materials with inconsistent elasticity tend to curl up after being combined in the prior art. It provides a tension-free composite method, system and shorts processing method for elastic strips, which can realize the tension-free composite of elastic and non-elastic materials and meet the flatness requirements of the composite material.

[0011] 2. Technical Solution To achieve the above objectives, the technical solution provided by the present invention is as follows: The present invention provides a tension-free composite method for elastic strips, comprising at least the following steps: A floating roller is configured to hold the elastic material roll, and a feeding mechanism is configured to unwind the elastic material roll; Multiple tension rollers are set up in the conveying path of the elastic strip for support, and the tension of the elastic strip is controlled in stages using a tension control component, including at least two levels of control. The control components are configured to include a traction roller group and a tension controller. The traction roller group adjusts the conveying speed of the elastic strip according to the detected tension signal, so that the tension of the elastic strip in the transmission section tends to be tension-free. After the elastic strip is output from the second control component, a composite roller group is set up to perform tensionless composite bonding of the elastic strip and the non-elastic sheet.

[0012] Furthermore, the control component includes: The first control component is configured to include a first traction roller group and a first tension controller, with the first traction roller group and the feeding mechanism forming a first conveying section; the second control component is configured to include a second traction roller group and a second tension controller, with the second traction roller group and the first traction roller group forming a second conveying section; wherein... The first tension controller controls the speed change of the feeding mechanism based on the tension value of the first conveying section to perform dynamic tension adjustment; the second tension controller controls the speed change of the first traction roller group based on the tension value of the second conveying section to perform dynamic tension adjustment. or: The first tension controller controls the speed change of the first traction roller group based on the tension value of the first conveying section to perform dynamic tension adjustment; the second tension controller controls the speed change of the second traction roller group based on the tension value of the second conveying section to perform dynamic tension adjustment.

[0013] Furthermore, the feeding mechanism is configured to feed material using a belt conveyor method, wherein the elastic material roll is floating, and a conveyor belt is provided in the feeding mechanism, which is in contact with the elastic material roll for surface contact conveying of the elastic strip.

[0014] Furthermore, the elastic strip is configured in the first traction roller group and the second traction roller group to be transported at a certain wrap angle with the rollers.

[0015] Furthermore, when adjusting the speed change, if the detected value is lower than the set value, the conveying speed of the elastic belt in that conveying section is reduced; if the detected value is higher than the set value, the conveying speed of the elastic belt in that conveying section is increased.

[0016] Furthermore, the third conveying section is located between the second traction roller group and the composite roller group, with the composite roller group configured close to the second traction roller group, and the elastic strip is conveyed in a horizontal state in the third conveying section.

[0017] Furthermore, the speed of the composite roller group is set to V0, and the speed of the second traction roller group is V1, where V1 is greater than or equal to V0, and the difference is within 5% of V0.

[0018] Furthermore, the speed difference between the second traction roller group and the composite roller group is adjusted by the second traction roller group to keep it within a set value range.

[0019] Furthermore, the non-elastic sheet is laminated with the elastic strip at the lamination station through thermal lamination, adhesive bonding, or ultrasonic lamination.

[0020] Furthermore, it also includes tension control using at least one third control component, which is configured between the first and second control components to form a corresponding conveying section.

[0021] The present invention provides a tension-free composite system for elastic strips, comprising: A roll support, wherein a floating roller is provided in the roll support for supporting the elastic roll; A feeding mechanism having a portion for contacting an elastic roll to transport the elastic strip; The first control component includes a first traction roller group and a first tension controller. The first traction roller group and the feeding mechanism form a first conveying section. The first tension controller can control the speed change action of the feeding mechanism according to the tension value of the first conveying section. The second control component includes a second traction roller group and a second tension controller. The second traction roller group and the first traction roller group serve as a second conveying section. The second tension controller controls the speed change action of the first traction roller group according to the tension value of the second conveying section. Sheet roller assembly, used for conveying inelastic sheets; Composite roller assembly is used for composite processing of elastic strips and inelastic sheets; The first control component, the second control component, and the feeding mechanism are all electrically connected to the controller.

[0022] Furthermore, the feeding mechanism includes a conveyor belt, a conveyor roller, and a discharge drive roller. The conveyor belt covers the conveyor roller and the discharge drive roller, and at least two conveyor rollers support the conveyor belt so that it forms a portion for contacting the elastic material roll.

[0023] Furthermore, the discharge direction of the second traction roller group is kept at the same horizontal level as the feed direction of the composite roller group.

[0024] Furthermore, the first traction roller group adopts a double roller structure, one of which is a power roller used to press and feed the elastic material belt.

[0025] Furthermore, the second traction roller group adopts a single roller structure, and its roller is a power roller.

[0026] The present invention discloses a method for processing shorts, wherein the processed shorts have at least a front waistband, a crotch, and a back waistband, and a skin-friendly sheet is laminated on the inner side of the crotch, comprising at least the following steps: An elastic strip is used as the crotch material, and a non-elastic sheet is used as the skin-friendly sheet material. The elastic strip and the non-elastic sheet are then bonded together without tension using the method or system described above. The composite material is cut and welded to form the connected front waistband, crotch, and back waistband, and the front waistband and back waistband are welded together to form the corresponding shorts.

[0027] Furthermore, the front waistband, crotch area, and back waistband are integrally formed from elastic strips, with a non-elastic sheet composited in the crotch area.

[0028] Furthermore, the elastic strip and inelastic sheet are bonded together with adhesive, and ultrasonic welding is performed near the edges on both sides of the longitudinal direction of the formed skin-friendly sheet to form multiple rows of transverse connection points.

[0029] Furthermore, it also includes the following steps: The composite elastic strip is cut to form a front waist section, crotch section, and back waist section with certain shapes; Add waist elastomers to both ends of the elastic strip in the longitudinal direction, and fold the edges of both ends to cover the elastomers; Fold the front waistband and back waistband in half, weld them together on both sides of the waistband, and cut the elastic strip to form the processed shorts.

[0030] 3. Beneficial effects Compared with the prior art, the technical solution provided by this invention has the following advantages: To achieve the composite of two different elastic materials, this invention sets up multiple control components and uses a tension controller to control the tension of each transmission segment, realizing tension-free composite of elastic strip and non-elastic sheet. In addition, through the cooperation of multiple control components, the tension can be adjusted step by step under a certain tension to achieve the final tension-free output, which helps to improve processing efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the tensionless composite process for elastic strips. Figure 2 This is a schematic diagram of the processing flow of a tensionless composite system for elastic strips. Figure 3 This is a schematic diagram of a pair of shorts in their unfolded state.

[0032] Explanation of the labels in the diagram: 1. Flexible material rolls; 2. Feeding mechanism; 21. Conveyor belt; 22. Discharge drive roller; 23. Conveyor roller; 3. Tensioning roller; 41. First tension controller; 42. Second tension controller; 43. First traction roller group; 44. Second traction roller group; 51. First composite roller; 52. Second composite roller; 601. Front waist area; 602. Crotch area; 603. Back waist area; 604. Elastomer. Detailed Implementation

[0033] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0034] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0035] Figure 1 A schematic diagram of a tensionless composite method is shown. Figure 2 The system flowchart is shown, where A represents the elastic strip and B represents the non-elastic sheet.

[0036] This embodiment of a tensionless lamination method for elastic strips includes the following steps during lamination: The elastic material roll 1 is placed on the floating roller, and the elastic material roll 1 is unwound by the feeding mechanism 2; In the conveying path formed by multiple tension rollers 3, the tension of the elastic strip is controlled in stages using a tension control component, including at least two levels of control.

[0037] The control assembly is configured to include a traction roller group and a tension controller. The traction roller group adjusts the conveying speed of the elastic strip based on the detected tension signal, bringing the tension of the elastic strip in its respective conveying section towards a tension-free state. During tension-free adjustment, if the detected value is lower than a set value, the conveying speed of the elastic strip in that conveying section is reduced to increase tension; if the detected value is higher than the set value, the conveying speed of the elastic strip in that conveying section is increased. This dynamic adjustment method ensures that the strip approaches a tension-free state in each conveying section.

[0038] After the elastic strip is output from the second control component, it enters the composite roller group with the non-elastic sheet at the same speed for tensionless composite.

[0039] This method allows for tension control of each transmission segment using a tension controller. Furthermore, through the cooperation of multiple control components, tension can be adjusted step by step under certain tension conditions to achieve final tension-free output, which helps improve processing efficiency.

[0040] This method can be used for processing disposable underwear in the clothing industry, as well as for processing products such as diapers and menstrual pants in the hygiene products industry.

[0041] As one implementation method, the method is further described and explained, and mainly includes the following steps and features: 1) Unwinding of elastic strip The elastic material roll 1 is placed on a floating roller and unwound by a feeding mechanism 2, which is configured to automatically conform to the elastic material roll. The feeding mechanism 2 uses a belt conveyor for feeding, and the elastic material roll 1 is set to float.

[0042] The feeding mechanism 2 can passively release the elastic material roll 1 by means of a material roller. This method has been described extensively in the existing technology and will not be elaborated in this embodiment.

[0043] As a better option, the feeding mechanism 2 is equipped with a conveyor belt 21, which is in contact with the elastic roll 1 for surface-contact conveying of the elastic strip. This surface-contact conveying method can ensure smooth transmission of the strip and reduce tension fluctuations.

[0044] 2) Tension graded control During the transmission phase, the elastic strip requires support from multiple tension rollers 3. Along the transmission path formed by these rollers, the tension of the elastic strip is controlled in stages using a tension control assembly. This staged control includes at least two levels: a first control assembly and a second control assembly.

[0045] The first control component is configured to include a first traction roller group 43 and a first tension controller 41. The first traction roller group 43 and the feeding mechanism form a first conveying section. The first tension controller 41 controls the speed change of the feeding mechanism 2 according to the tension value of the first conveying section to perform dynamic tension adjustment.

[0046] For example, when the first tension controller 41 detects that the real-time tension is lower than the set value, it reduces the conveying speed of the elastic strip of the feeding mechanism 2 to increase the tension. When the first tension controller 41 detects that the real-time tension is higher than the set value, it reduces the conveying speed of the elastic strip of the feeding mechanism 2 to decrease the tension.

[0047] The second control component is configured to include a second traction roller group 44 and a second tension controller 42. The area between the second traction roller group 44 and the first traction roller group 43 forms a second conveying section. The second tension controller 42 controls the speed change of the first traction roller group 43 according to the tension value of the second conveying section to perform dynamic tension adjustment.

[0048] For example, when the second tension controller 42 detects that the real-time tension is lower than the set value, it reduces the elastic strip conveying speed of the first traction roller group 43 to increase the tension. When the first tension controller 41 detects that the real-time tension is higher than the set value, it reduces the elastic strip conveying speed of the first traction roller group 43 to reduce the tension.

[0049] In another embodiment, the system can be configured such that: a first tension controller 41 controls the speed change of the first traction roller group 43 according to the tension value of the first conveying section, thereby performing dynamic tension adjustment; and a second tension controller 42 controls the speed change of the second traction roller group 44 according to the tension value of the second conveying section, thereby performing dynamic tension adjustment.

[0050] In some embodiments, at least one third control component can be added between the first and second control components to form a corresponding conveying segment. In various embodiments of this application, the transmission path of the elastic strip is divided into multiple conveying segments, thereby enabling independent control of each segment; furthermore, the various conveying segments are hierarchically arranged and can cooperate with each other to gradually weaken the effect of tension.

[0051] It is worth noting that in existing tension-free composite technologies, tension-free unwinding is performed during unwinding. On the one hand, it is difficult to achieve a good tension-free state, and the tension fluctuation is relatively large. On the other hand, it is in an uncontrollable state. As the unwinding speed increases, it may lead to even greater tension fluctuations. Therefore, its production efficiency is limited.

[0052] Based on the graded control method in this application, if a higher production efficiency is required during unwinding, the unwinding speed can be increased. This will create a certain tension on the elastic strip during unwinding, and then the tension will be gradually weakened and corrected through each conveying section, thereby ensuring higher efficiency tension-free composite, and within a certain efficiency range, the production speed can be controlled.

[0053] In some implementations, the elastic strip is transported at a certain wrap angle with the rollers in the first traction roller group 43 and the second traction roller group 44. This wrap angle transport method helps to better control the tension of the strip and ensure the stability of the strip during transport. To form the wrap angle, the tension roller 3 can be redirected, thereby ensuring the effectiveness of the traction roller group.

[0054] In traditional tensionless composite systems, adding more traction roller sets increases the difficulty of tension control. However, when tension control is used for graded control, increasing the wrap angle can achieve more stable transmission.

[0055] The traction roller group can be used for material transfer via a double-roller pressing method or a single-roller method. In one embodiment, the first traction roller group 43 employs a double-roller structure, while the second traction roller group 44 employs a single-roller structure. Of course, the double-roller or single-roller referred to here refers to the drive rollers and does not include the tension roller 3.

[0056] The third conveying section is located between the second traction roller group 44 and the composite roller group. The second traction roller group 44 is positioned close to the composite roller group. In order to reduce the influence of gravity, the elastic strip is conveyed in a horizontal state in the third conveying section.

[0057] 3) Tension-free composite After the elastic strip is output from the second control component, it enters the composite roller group at the same speed as the non-elastic sheet for tensionless composite.

[0058] While the elastic strip is being conveyed, the inelastic sheet is also being conveyed. Since the inelastic sheet will not undergo elastic deformation even under pressure, it can be conveyed using the traditional strip conveying method and guided to the lamination station. If the inelastic sheet is being partially laminated, it can be cut into the appropriate shape before lamination. This process can be adjusted according to actual needs.

[0059] At the lamination station, the speed of the lamination roller group is set to V0, and the speed of the second traction roller group 44 is V1, typically configured to be equal to V0. To avoid speed fluctuations affecting the lamination effect during lamination, in the preferred embodiment, V1 is greater than or equal to V0, with a certain fluctuation difference between them, within 5% of V0. This speed matching ensures tension control during the lamination process, allowing the elastic strip to remain in a relaxed state and preventing product warping due to speed mismatch.

[0060] The speed difference V1 between the second traction roller group 44 and the composite roller group is adjusted by the second traction roller group 44 to keep it within a set range. This adjustment method ensures stable transmission of the strip and sheet during the composite process.

[0061] In specific lamination processes, elastic strips and non-elastic sheets are bonded together using adhesives. For example, in hot melt adhesive lamination, the non-elastic sheet needs to be coated with adhesive before entering the lamination roller assembly. This method can refer to existing adhesive application methods.

[0062] As another implementation method, the non-elastic sheet is laminated with the elastic strip at the lamination station by thermal lamination, adhesive bonding or ultrasonic welding. The choice of these lamination methods can be considered according to specific process requirements and material characteristics, and there are no specific restrictions.

[0063] This application provides a tension-free lamination system for elastic strips. Through precise tension control and efficient lamination technology, this system achieves high-quality lamination between elastic strips and sheets, suitable for the manufacturing process of products such as disposable underwear. The components of this system are described below to enable lamination processing using the tension-free lamination method.

[0064] Material roll support and floating roller The material roll support is equipped with a floating roller, which can be simply the roller shafts at both ends, used to support the elastic material roll 1.

[0065] This system uses floating rollers to support the elastic strip 1, allowing the elastic strip to maintain a certain degree of freedom during transmission and reducing deformation or damage caused by uneven tension. The floating roller design enables the strip to adaptively adjust tension during unwinding, ensuring smooth and stable transmission. There are no restrictions on the specific structure of the strip support.

[0066] Feeding mechanism The feeding mechanism 2 has a portion for contacting the elastic strip 1 to transport the elastic strip. In one embodiment, the feeding mechanism 2 includes a drive roller, which causes the elastic strip 1 to be unloaded by friction between the drive roller and the elastic strip 1.

[0067] In some embodiments, the feeding mechanism 2 includes a conveyor belt 21, a conveyor roller 23, and a discharge drive roller 22. The conveyor belt 21 covers the conveyor roller 23 and the discharge drive roller 22, forming a surface contact conveying section that contacts the elastic roll 1. This design ensures that the friction between the strip and the conveyor belt 21 is evenly distributed during transmission, avoiding strip stretching or shrinkage caused by uneven friction.

[0068] In some embodiments, a feeding adjustment mechanism is also included, which enables the elastic roll to move relative to the feeding mechanism to achieve feeding. In a more preferred embodiment, the feeding adjustment mechanism is used to mount the feeding mechanism 2, which includes a guide rail, a slider, and a cylinder. The feeding mechanism 2 is integrally mounted on the slider of the feeding adjustment mechanism. The piston rod of the cylinder is connected to a section of the slider, and the slider cooperates with the guide rail. Constant pressure control is set for the cylinder, enabling it to drive the slider downward with a constant air pressure, so that the conveyor belt 21 always keeps the roll tightly pressed.

[0069] Control components The control unit includes a traction roller assembly and a tension controller. The traction roller assembly adjusts the conveying speed of the elastic strip based on the detected tension signal, bringing the tension of the elastic strip in its respective conveying section towards a tension-free state. During tension-free adjustment, if the detected value is lower than a set value, the conveying speed of the elastic strip in that section is reduced to increase tension; if the detected value is higher than the set value, the conveying speed of the elastic strip in that section is increased. This dynamic adjustment method ensures that the strip approaches a tension-free state in each conveying section.

[0070] In one conceivable implementation, the control assembly includes a first control assembly and a second control assembly. The first control assembly includes a first traction roller group 43 and a first tension controller 41. The first traction roller group 43 and the feeding mechanism form a first conveying section. The first tension controller 41 can control the speed change of the feeding mechanism 2 according to the tension value of the first conveying section. When the first tension controller 41 detects that the real-time tension is lower than the set value, it reduces the conveying speed of the elastic strip of the feeding mechanism 2 to increase the tension. When the first tension controller 41 detects that the real-time tension is higher than the set value, it reduces the conveying speed of the elastic strip of the feeding mechanism 2 to decrease the tension.

[0071] The second control component is configured to include a second traction roller group 44 and a second tension controller 42. The area between the second traction roller group 44 and the first traction roller group 43 forms a second conveying section. The second tension controller 42 controls the speed change of the first traction roller group 43 based on the tension value of the second conveying section, performing dynamic tension adjustment. When the second tension controller 42 detects that the real-time tension is lower than the set value, it reduces the elastic strip conveying speed of the first traction roller group 43 to increase the tension. When the first tension controller 41 detects that the real-time tension is higher than the set value, it reduces the elastic strip conveying speed of the first traction roller group 43 to decrease the tension.

[0072] In another embodiment, the system can be configured such that: a first tension controller 41 controls the speed change of the first traction roller group 43 according to the tension value of the first conveying section, thereby performing dynamic tension adjustment; and a second tension controller 42 controls the speed change of the second traction roller group 44 according to the tension value of the second conveying section, thereby performing dynamic tension adjustment.

[0073] In one embodiment, the first traction roller group 43 has a double roller structure, one of which is a power roller; the second traction roller group 44 has a single roller structure, and its roller is a power roller; and the discharge direction of the second traction roller is at the same horizontal level as the feed direction of the composite roller group.

[0074] The tension controller is located in the area below the traction roller assembly, so that the data detected by the tension controller includes the effect of the elastic strip's gravity on the tension.

[0075] Sheet Roller Assembly Sheet roller sets are used to transport non-elastic sheets, such as the skin-friendly sheet material for disposable underwear, which is typically non-elastic nonwoven fabric. These sheet roller sets may include a cutting station to form sheet structures of corresponding shapes for subsequent lamination. By precisely controlling the sheet's transport speed and tension, the sheet roller set ensures that the sheet and elastic strip are matched during lamination.

[0076] Composite roller assembly Composite roller sets are used for laminating elastic strips and inelastic sheets. In adhesive bonding or thermoplastic bonding processes, the composite roller set includes at least two rollers: a first composite roller 51 and a second composite roller 52, with the first composite roller serving as the power roller. It is used to press the two materials together, and through the pressing action of the composite roller set, the elastic strip and sheet are tightly bonded together to form an integrated structure. In ultrasonic welding processes, the composite roller set may consist of only one roller and be combined with ultrasonic equipment to form a composite workstation. Therefore, composite roller sets are not necessarily required to have multiple rollers.

[0077] In a specific implementation plan, in order for the equipment to meet production needs, a cutting station can be set up after the composite station to cut the composite material into the corresponding shape for specific product processing.

[0078] Combining the above tensionless composite method for elastic strips, and based on its composite system, it can be used to process disposable shorts, see reference. Figure 3 The processed shorts have at least a front waistband 601, a crotch 602, and a back waistband 603. A skin-friendly sheet is laminated on the inside of the crotch 602. To prevent the crotch 602 from curling after the skin-friendly sheet is laminated, the shorts can be processed by a corresponding lamination method and system.

[0079] This embodiment discloses a method for processing shorts, wherein the processed shorts have at least a front waistband 601, a crotch 602, and a back waistband 603, and a skin-friendly sheet is laminated on the inside of the crotch 602, and includes at least the following steps: Elastic strips are used as the crotch area material (602), and non-elastic sheets are used as the skin-friendly sheet material. The elastic strips and non-elastic sheets are bonded together using the aforementioned tension-free bonding method. For example, the elastic strips and non-elastic sheets are bonded together with adhesive. Both the elastic strips and non-elastic sheets are made of non-woven fabric.

[0080] The composite material is cut and welded to form the connected front waistband 601, crotch 602, and back waistband 603. Cutting refers to forming the corresponding shape; welding can be ultrasonic welding to connect related parts, such as connecting the two sides of the front waistband 601 and the back waistband 603.

[0081] In one embodiment, the front waistband 601, crotch 602, and back waistband 603 are integrally formed of elastic strips, and a non-elastic sheet is laminated in the crotch 602.

[0082] In one composite method, the elastic strip and inelastic sheet in the shorts processing method are bonded together with adhesive, and ultrasonic welding is performed near the edges on both sides of the longitudinal direction of the formed skin-friendly sheet to form multiple rows of transverse connection points.

[0083] Specifically, the elastic material roll 1 is first placed on the floating roller, and the elastic material roll 1 is unwound by the feeding mechanism 2.

[0084] In the conveying path formed by multiple tension rollers 3, the tension of the elastic strip is controlled in stages by a tension control component. The control component is configured to include a traction roller group and a tension controller. The traction roller group adjusts the conveying speed of the elastic strip according to the detected tension signal, so that the tension of the elastic strip in its transmission section tends to be in a tension-free state.

[0085] The first control component is configured to include a first traction roller group 43 and a first tension controller 41. The first traction roller group 43 and the feeding mechanism serve as a first conveying section. The first tension controller 41 controls the speed change action of the feeding mechanism 2 according to the tension value of the first conveying section to perform dynamic tension adjustment.

[0086] The second control component is configured to include a second traction roller group 44 and a second tension controller 42. The second traction roller group 44 and the first traction roller group 43 serve as a second conveying section. The second tension controller 42 controls the speed change of the first traction roller group 43 according to the tension value of the second conveying section to perform dynamic tension adjustment.

[0087] After the elastic strip is output from the second control component, it enters the composite roller group with the non-elastic sheet for tensionless composite.

[0088] In this process, the non-elastic sheet is cut into a specific shape during transport, coated with adhesive, and then enters the composite roller assembly for lamination. After lamination, it can be processed using existing underwear processing methods.

[0089] The corresponding processing steps may include: The composite elastic strip is cut to form a front waist section 601, a crotch section 602, and a back waist section 603 with certain shapes. Add waist elastic body 604 to both ends of the elastic strip in the longitudinal direction, and fold the edges of both ends to cover the elastic body 604. The front waistband 601 and the back waistband 603 are folded in half, and welded together on both sides of the waistband to connect the front waistband 601 and the back waistband 603, forming the processed shorts. In this method, welding and cutting are performed simultaneously, resulting in shorter cut edges.

[0090] To prevent cracking of the inelastic sheet, ultrasonic welding is performed on both longitudinal edges of the inelastic sheet to form multiple transverse welding points. These welding points can provide an elastic transition at the connection between the elastic strip and the inelastic sheet, thus preventing edge cracking.

[0091] The above processing steps are mainly based on existing shorts processing methods. For the elastic composite part, the non-elastic sheet is composited with the process of this application as a skin-friendly sheet. The other processes can refer to existing technologies, such as the corresponding processing technologies in patents WO2014 / 185247, CN202211183133.8, and CN1265017A.

[0092] In the above content: "Elasticity" refers to a material that can stretch in a certain direction and return to its original state after stretching. Based on this, "elastic strip" refers to a strip-shaped material with elasticity. Disposable shorts are a feasible application scenario for this method; elastic strip refers to the basic material used to manufacture shorts, forming areas such as the waistband and crotch. Especially for fine denier materials, the surface has many wrinkles, making them easily stretched.

[0093] A "floating roller" refers to a roller or connecting shaft that can rotate freely and has a good pivot connection point. It can rotate with a small external force to ensure that the elastic material roll is tension-free when unloading. Of course, it is impossible to achieve a completely tension-free state in reality. Therefore, the tension-free state referred to is more about approaching zero tension or a relatively relaxed state, and it does not require that the actual value must be tension-free.

[0094] "Tension-free" means that the elastic material is close to a state of zero tension. For elastic materials, it is a relatively relaxed state and there is no tensile deformation. For inelastic materials, even if they are stretched, they will not shrink back because they are not elastic. Therefore, in tension-free composites, it is not required that the inelastic material be in a state of zero tension or relaxation.

[0095] "Inelastic" refers to a material that does not have the ability to return to its original state when stretched. The inelasticity referred to here can be completely inelastic, or it can be a state with a certain degree of elasticity, or it can be a slight elasticity formed by the material's own properties. After being stretched, its elongation is generally within 20%.

[0096] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A method for processing shorts, wherein the processed shorts have at least a front waistband, a crotch, and a back waistband, and a skin-friendly sheet is laminated to the inner side of the crotch, characterized in that, At least the following steps are included: Elastic strips are used as the crotch material, and non-elastic sheets are used as the skin-friendly sheet material. A tension-free composite system is employed to bond the elastic strips and non-elastic sheets together without tension. The process is as follows: A floating roller is configured to hold the elastic material roll, and a feeding mechanism is configured to unwind the elastic material roll; Multiple tension rollers are set up in the conveying path of the elastic strip for support, and the tension of the elastic strip is controlled in stages using a tension control component, including at least two levels of control. The first control component includes a first traction roller group and a first tension controller, with the first traction roller group and the feeding mechanism forming a first conveying section; the second control component includes a second traction roller group and a second tension controller, with the second traction roller group and the first traction roller group forming a second conveying section; the traction roller group adjusts the conveying speed of the elastic strip according to the detected tension signal, so that the tension of the elastic strip in its transmission section tends to be tension-free. The first tension controller controls the speed change of the feeding mechanism based on the tension value of the first conveying section to perform dynamic tension adjustment, and the second tension controller controls the speed change of the first traction roller group based on the tension value of the second conveying section to perform dynamic tension adjustment. Alternatively: The first tension controller controls the speed change of the first traction roller group based on the tension value of the first conveying section to perform dynamic tension adjustment; the second tension controller controls the speed change of the second traction roller group based on the tension value of the second conveying section to perform dynamic tension adjustment. After the elastic strip is output from the second control component, a composite roller group is set up to perform tensionless composite bonding of the elastic strip and the non-elastic sheet. The composite material is cut and welded to form the connected front waistband, crotch, and back waistband, and the front waistband and back waistband are welded together to form the corresponding shorts.

2. The method for processing shorts according to claim 1, characterized in that: The elastic strip and inelastic sheet are bonded together with adhesive, and ultrasonic welding is performed near the edges on both sides of the longitudinal direction of the formed skin-friendly sheet to form multiple rows of transverse connection points.

3. The method for processing shorts according to claim 2, characterized in that: It also includes the following steps: The composite elastic strip is cut to form a front waist section, crotch section, and back waist section with certain shapes; Add waist elastomers to both ends of the elastic strip in the longitudinal direction, and fold the edges of both ends to cover the elastomers; Fold the front waistband and back waistband in half, weld them together on both sides of the waistband, and cut the elastic strip to form the processed shorts.

4. The method for processing shorts according to claim 1, characterized in that: The speed of the composite roller group is set to V0, and the speed of the second traction roller group is V1. V1 is greater than or equal to V0, and the difference is within 5% of V0.

5. The method for processing shorts according to claim 1, characterized in that: The feeding mechanism is configured to feed materials using a belt conveyor method. The elastic material roll is floating, and a conveyor belt is installed in the feeding mechanism. The conveyor belt is in contact with the elastic material roll to transport the elastic strip material through surface contact.

6. The method for processing shorts according to claim 4, characterized in that: The speed difference between the second traction roller group and the composite roller group is adjusted by the second traction roller group to keep it within a set range.

7. The method for processing shorts according to claim 1, characterized in that: The non-elastic sheet is laminated with the elastic strip at the lamination station through thermal lamination, adhesive bonding, or ultrasonic lamination.

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