Web transfer process integrating stretching, condensation and lamination in fiber layer transfer

Abstract

The present invention discloses a fiber web transfer process that integrates stretching, condensation, and bonding during fiber layered transfer, including the steps of: S1, layered stretching and condensation; S2, bonding. On the one hand, the present invention is based on layered stripping to allow the breast cylinder to rotate at a low load, while layering and backflow work together to not only complete the fiber stretching, condensation, and bonding process, but also the transfer path is selectable based on the working conditions. Then, the layered transfer not only reduces the probability of fiber accumulation, entanglement, and blockage, but also reduces the probability of insufficient fiber transfer and the occurrence of cotton knots and white spots; on the other hand, based on the obstruction of the unidirectional transfer section, the fibers are prevented from being disturbed by airflow during the condensation process, while also reducing the probability of insufficient transfer. In addition, based on the unchanged web discharge speed, the discharge sorting is controlled by time and stroke to complete the alignment and bonding of the winding ends. At the same time, the traction force is relatively balanced during bonding, eliminating the uneven thickness of the fiber web, improving the density and strength of the fiber web, and being suitable for the transfer of various fibers.

Description

Technical Field

[0001] The invention belongs to the technical field of carding machines, and in particular relates to a fiber web transfer process integrating stretching, condensation and lamination in fiber layer transfer. Background Art

[0002] The carding machine is a kind of textile machinery used to process fibers. Its working principle is to loosen, mix and remove impurities from the fiber raw materials that have been preliminarily processed, and to comb the block fibers into bundles and single fibers to form a thin layer of mesh fibers.

[0003] Currently, fibers are transferred between the chest cylinder and the large cylinder through a fiber web transfer structure, wherein the transfer structure includes a middle doffer and a middle transfer roller. The fibers from the chest cylinder pass around the middle doffer and are then transferred to the large cylinder by the middle transfer roller. However, with the needs of fiber denier, product weight, transfer speed, etc., if the middle doffer is used to transfer fine denier fibers (ultrafine fibers), the following technical defects will occur:

[0004] 1) Fine denier fibers have a large specific surface area, are lightweight, and are soft and flexible. The existing doffer wire clothing design (e.g., tooth density, tooth shape, angle, height) or surface condition (e.g., finish) may not be suitable for effectively grabbing and releasing such fine, easily tangled fibers. This results in inadequate transfer of fine denier fibers, which then become adsorbed on the doffer wire and difficult to remove, forming retention points that can develop into neps (core hazard: disruption of fiber uniformity, formation of dense lumps; terminal consequences: filtration blockage / mechanical weak areas / bacterial breeding grounds) and white spots (core hazard: localized fiber loss, interruption of structural continuity; terminal consequences: leakage / holes / protection failure).

[0005] 2) The transfer capacity (the amount of fiber transferred per unit time) of the doffer and its stripping device has an upper limit. When the machine speed (output) increases, the amount of fiber reaching the doffer per unit time exceeds its effective transfer capacity, causing fiber accumulation. At the same time, at high speeds, the distribution uniformity and directionality of the fiber flow on the doffer surface deteriorate, making local accumulation more likely to occur. The accumulated fibers are easily entangled (roller-wrapped) by the high-speed rotating roller. Then, tiny impurities (dust, short fibers) that have not been fully removed flow in with the fiber flow and are more likely to become entangled with the fibers in areas where the transfer is insufficient, exacerbating blockage (impurity blockage).

[0006] 3) It is impossible to form a double-layer web and transfer it to the large cylinder at the same time (it is impossible to transfer it to the large cylinder in layers), and the fiber web will be too thick or too thin in one transfer, that is, the uniformity and web quality are both insufficient. At the same time, the fiber transfer process only involves stretching, and there is no opportunity for condensation and bonding. The density and strength of the fiber web are difficult to meet the processing requirements, and it also affects the fiber web quality.

[0007] 4) Since the breast cylinder cannot effectively complete a transfer during the transfer process, the remaining fibers rotate with the breast cylinder and mix with the fiber feed and repeat the transfer operation. Therefore, the amount of residual fibers during rotation cannot be determined, making it difficult to control the fiber feed amount each time. Not only does it cause serious uneven feeding, but it also cannot meet the needs of high-speed production. Summary of the Invention

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an improved fiber web transfer process that integrates stretching, condensation and lamination in fiber layer transfer.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A fiber web transfer process that integrates stretching, condensation, and lamination during fiber layer transfer. The transfer path used is located between a breast cylinder and a large cylinder arranged on the left and right. The transfer path includes multiple layered paths and a return path spaced apart vertically. Each layered path includes multiple transfer rollers, at least two of which rotate in the same direction to form a unidirectional transfer section that bypasses the top or bottom of the two transfer rollers. The process includes the following steps:

[0011] S1, layered stretching and condensation

[0012] Based on the rotation of the chest cylinder, the fibers wound on the chest cylinder pass through the feeding end of each layering path in turn, and based on each feeding end, the layers are peeled off in turn and the fiber layers enter each layering path in turn, and the chest cylinder rotates unloaded. At the same time, the fibers entering the layering path go around the transfer roller into the unidirectional transfer section and then are transferred to the large cylinder through the transfer roller to form the upper layering path. The fibers entering the layering path are directly transferred from the unidirectional transfer section to the large cylinder to form the lower layering path. The unidirectional transfer sections of the upper and lower layering paths are located at the top and bottom and do not interfere with each other. The fibers are stretched and condensed during the transfer to form a fiber web layer, and the return roller rotating in the same direction as the transfer roller at the feeding end of the upper layering path performs fiber reflux.

[0013] S2, Fit

[0014] Based on the cooperation of the discharge speed, time and stroke of the upper and lower layered paths, the discharge speed of each layered path is kept equal, and the discharge time and stroke are changed to form a sequential discharge from bottom to top. As the large cylinder rotates, each discharge end keeps the winding end aligned and is transferred to the large cylinder from the inside to the outside with gradual thickening and bonding.

[0015] Preferably, in step S1, there is at least one upper layer path, and multiple upper layer paths are arranged in intervals, with each upper layer path corresponding to a return path. Based on the design of multiple layer paths, not only is a selective transfer method formed to meet the transfer needs of different fibers, but also based on the upper and lower layer transfer method, it can meet the combing and transfer needs of low-weight, high-speed layer cotton, with faster speed and higher quality. In addition, based on the return stripping, the fibers that may remain at the feed end of the upper layer path are returned to the breast cylinder, reducing the probability of accumulation, entanglement, and blockage at the feed end of the upper layer path.

[0016] According to one specific embodiment and preferred aspect of the present invention, in step S1, the upper layering path includes a breast cylinder working roller, a first transfer roller, a second transfer roller, and a stripping roller, located between the breast cylinder and the large cylinder and arranged along the travel path. The first and second transfer rollers rotate in the same direction, and the upper portions of the first and second transfer rollers form a unidirectional transfer section. The layout of the unidirectional transfer section prevents airflow generated by the rollers during the transfer between the upper and lower layering paths from interfering with or disrupting the fiber web transfer. Furthermore, the unidirectional transfer section not only undergoes a stretching process but also a condensation process, thereby improving the quality of the fiber web.

[0017] Preferably, the bottom of the breast cylinder work roll is located above and to the left of the first transfer roll, the second transfer roll is located above and to the right of the first transfer roll, and the stripping roll is located below and to the right of the second transfer roll. This four-roll layout not only creates the required unidirectional transfer section but also provides corresponding stretching and condensing combinations at different height differences to meet the required quality (such as density).

[0018] Preferably, the return roller is located between the breast cylinder working roller and the breast cylinder, and the return roller and the breast cylinder working roller rotate in the same direction. Based on the same direction rotation of the two, the stripping roller returns the fibers that may remain on the breast cylinder working roller to the breast cylinder.

[0019] In some embodiments, the return roller is tangential to the breast cylinder work roller and the breast cylinder from both sides. This tangential coordination of the three not only improves the fiber return efficiency, but also eliminates the impact of the airflow generated by the breast cylinder work roller on the fibers to be layered on the breast cylinder.

[0020] According to another specific embodiment and preferred aspect of the present invention, in step S1, the lower layer path includes a middle doffer and a middle transfer roller located at the bottom, wherein the bottoms of the middle doffer and the middle transfer roller form a unidirectional transfer section. Due to the bottom layout of the unidirectional transfer section, the airflow generated by the rollers during the upper and lower layer paths is prevented from interfering with or disrupting the fiber web transfer. Furthermore, the unidirectional transfer section not only undergoes a stretching process but also a condensation process, thereby improving the quality of the fiber web.

[0021] Preferably, the breast cylinder and the middle doffer, the middle doffer and the middle transfer roller, and the middle transfer roller and the large cylinder are tangentially matched. Based on the roller-cutting cooperation, the transfer of the fiber layer can be fully formed.

[0022] According to another specific embodiment and preferred aspect of the present invention, the lower layer path further includes a windshield roller disposed between the breast cylinder and the middle doffer and blocking the inlet end of the lower layer path. The windshield roller serves to isolate airflow, thereby preventing it from affecting the fiber transfer on the breast cylinder.

[0023] Preferably, the windshield roller is located above and to the side of the middle doffer and can be set to rotate on its own, wherein the windshield roller and the middle doffer rotate in opposite directions, and the speed of the windshield roller is adjustable based on the speed of the middle doffer. The self-rotation of the windshield roller can prevent the fibers from adhering to or accumulating on the roller surface, keep the surface clean and assist in fiber transfer. For example, in a special single-roller transfer mechanism, the windshield roller strips the remaining fibers on the middle doffer at a higher speed. When used to strip fibers, Vwindshield>Vmiddle doffer (linear speed) must be satisfied to ensure that the fibers are transferred from the low-speed roller to the high-speed roller. If it is only used for windshield, the speed can be lower, but it still needs to rotate to avoid fiber accumulation.

[0024] According to another specific implementation and preferred aspect of the present invention, in step S2, the discharging speed formed by the lower layered path is V1, the discharging stroke is S1, and the time required for discharging is T1; the discharging speed formed by the upper layered path is V2, the discharging stroke is S2, and the time required for discharging is T2; the arc length formed by the material ends of the upper and lower layered paths is L, wherein V1=V2, S2-S1=L=ω×(T2-T1)×r, ω is the angular velocity of the large cylinder, and r is the radius of the large cylinder.

[0025] In short, the arc length L can be directly obtained or directly derived from the discharge stroke difference. If ω and r are both known, then T2-T1 can be directly obtained. That is, at the same discharge speed, the discharge waiting time formed based on the time difference can achieve alignment of the fiber web ends. It should also be noted that this is only an optimal implementation method.

[0026] Preferably, as the cylinder rotates, the discharge ends of each layered path are sequentially wound around the cylinder from bottom to top, maintaining the same discharge speed and direction during stretching, allowing for internal and external bonding. The speed and direction constraints ensure that the traction generated during bonding is relatively uniform, preventing uneven force during bonding that could compromise the quality (e.g., uniformity) of the transferred fiber web.

[0027] In addition, the breast cylinder and the main cylinder rotate in the same direction, and the discharge end of each layered path is tangent to the main cylinder; and / or, the feed end of each layered path is tangent to the breast cylinder. Based on the roller cutting coordination of the feed end and the discharge end, the fibers are peeled off from the breast cylinder in layers at the same angle and speed. At the same time, the stretched and condensed fiber web is transferred to the main cylinder at the same angle and speed, with the winding ends aligned at each discharge end and gradually thickened and bonded from the inside to the outside (this process involves not only stretching but also bonding). At the same time, the breast cylinder and the main cylinder rotate in the same direction. Its essence is to achieve low-damage, high-orientation, and high-efficiency continuous transfer of fibers through the coordination of speed gradient and needle clothing, while reducing energy consumption and loss. This design will have a significant impact on ensuring the uniformity, strength and productivity of non-woven materials. When the breast cylinder then delivers the initially loosened fibers to the main cylinder, the movement of the two at the contact point (tangent point) must meet the following requirements: the breast cylinder surface linear speed < the main cylinder surface linear speed (for example, the breast cylinder speed is 400m / min, the main cylinder speed is 800m / min; in short, the difference between the two is at least two times). Speed ​​gradient: The faster linear speed of the main cylinder generates "traction" that gently peels the fibers from the lower-speed roller (breast cylinder) and attracts them to the surface of its own card clothing. Motion coordination: Co-rotation ensures that the fibers move in the same direction at the contact point, preventing fibers from being pulled in the opposite direction and breaking.

[0028] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0029] In the transfer of existing fiber webs, fine denier fibers have a large specific surface area, are light in weight, and are soft and easy to bend. If a mid-doffer is used to transfer fine denier fibers, the design of the mid-doffer's card clothing (such as tooth density, tooth shape, angle, height) or surface condition (such as finish) may not be suitable for effectively grabbing and releasing such fine and easily tangled fibers, resulting in insufficient transfer of fine denier fibers. The fibers will be adsorbed on the doffer's card clothing and difficult to peel off, forming retention points, which will then develop into cotton neps (core hazards: destruction of fiber uniformity, formation of dense lumps; terminal consequences: filtration blockage / mechanical weak areas / bacterial breeding grounds). ) and white spots (core hazard: local fiber loss, interruption of structural continuity; terminal consequences: leakage / holes / protection failure); at the same time, the transfer capacity (the amount of fiber transferred per unit time) of the middle doffer and its stripping device has an upper limit. When the machine speed (output) increases, the amount of fiber reaching the middle doffer per unit time exceeds its effective transfer capacity, causing fiber accumulation; at the same time, at high speed, the distribution uniformity and directionality of the fiber flow on the doffer surface deteriorate, and local accumulation is more likely to occur. The accumulated fibers are easily entangled (roller-wrapped) under the drive of the high-speed rotating roller, and then , tiny impurities (dust, short fibers) that have not been fully removed flow in with the fiber flow, and are more likely to be entangled with the fibers in areas where the transfer is insufficient, exacerbating blockage (impurities); in addition, it is impossible to simultaneously form a double-layer web and transfer it to the large cylinder (it is impossible to transfer it to the large cylinder in layers), and in one transfer of the fibers, the fiber web will be too thick or too thin, that is, both the uniformity and the web surface quality are insufficient; at the same time, there is only stretching in the fiber transfer process, and there is no opportunity for condensation and bonding. The density and strength of the fiber web are difficult to meet the processing requirements, and the fiber web quality will also be affected. Finally, since the breast cylinder cannot effectively complete a transfer during the transfer process, the remaining fibers rotate with the breast cylinder and are mixed with the fiber feed and then repeated for transfer. Therefore, the amount of residual fibers cannot be determined during the rotation, making it difficult to control the amount of fiber feed each time. Not only does it cause serious uneven feeding, but it also fails to meet the needs of high-speed production and other shortcomings. The present invention cleverly solves the various existing shortcomings by comprehensively designing a fiber web transfer process that integrates stretching, condensation, and bonding in fiber layer transfer.After adopting the fiber web transfer process of stretching, condensing and bonding in the fiber layer transfer, first, based on the rotation of the chest cylinder, the fibers wound on the chest cylinder pass through the feeding end of each layer path in turn, and based on each feeding end, the layers are peeled off in turn and the fiber layers enter each layer path in turn, and the chest cylinder rotates unloaded. At the same time, the fibers entering the layer path go around the transfer roller into the unidirectional transfer section and then are transferred to the large cylinder through the transfer roller to form the upper layer path. The fibers entering the layer path are directly transferred from the unidirectional transfer section to the large cylinder to form the lower layer path, wherein the unidirectional transfer sections of the upper and lower layer paths are located at the top and bottom and do not interfere with each other. The fibers are stretched and condensed during the transfer to form a fiber web layer, and the return roller based on the transfer roller at the feeding end of the upper layer path rotates in the same direction for fiber reflux; then, based on the cooperation of the discharge speed, time and stroke of the upper and lower layer paths, the discharge speed of each layer path is kept equal, the discharge time and stroke are changed to form a discharge in sequence from bottom to top, and as The large cylinder rotates, and each discharge end keeps the winding end aligned and is transferred to the large cylinder with increasing thickness and bonding from the inside to the outside. Therefore, on the one hand, the present invention is based on multiple transfer paths formed by layered stripping, so that the breast cylinder rotates with low load, and at the same time, the layered superimposed transfer is combined with the reflux synergistic assistance, which not only completes the entire process of fiber stretching, condensation, and bonding, but also the transfer path can be selected based on the working conditions. At the same time, the layered transfer not only reduces the probability of fiber accumulation, entanglement and blockage, but also reduces the probability of cotton knots and white spots due to insufficient fiber transfer; on the other hand, based on the top and bottom barriers of the unidirectional transfer section, the fibers are avoided from being disturbed by airflow during the condensation process, and the probability of insufficient or incomplete fiber transfer under airflow interference is also reduced. In addition, based on the unchanged discharge speed, the discharge sorting is controlled by time and stroke to complete the alignment and bonding of the winding ends. At the same time, the traction force during bonding is relatively balanced, eliminating the uneven thickness of the fiber web, and improving the density and strength of the fiber web, which is suitable for the transfer of various fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the multi-purpose fiber web transfer structure based on mid-doffer layered transfer in this embodiment;

[0031] Figure 2 for Figure 1 The main view diagram (including the transfer status of each path);

[0032] Figure 3 for Figure 2 Schematic diagram of the upper and middle layer paths and the return flow path;

[0033] Figure 4 for Figure 2 Schematic diagram of the middle and lower layer paths;

[0034] Figure 5 for Figure 1 Schematic top view of

[0035] Figure 6 for Figure 5 AA-direction cross-sectional view;

[0036] Among them: 1, chest cylinder; 2, large cylinder; P, transfer path; P1, layered path; P 上 , upper layer path; 4, chest cylinder working roller; 5, first transfer roller; 6, second transfer roller; 7, stripping roller; P 下 , lower layer path; 8, middle doffer; 9, middle transfer roller; 10, windshield roller; P2, return path; 3, return roller. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0042] like Figures 1 to 6 As shown, in the fiber layered transfer process of this embodiment, the fiber web transfer process of stretching, condensing and laminating is integrated. The transfer path P used is located between the chest cylinder 1 and the large cylinder 2 arranged on the left and right, and the transfer path P includes multiple layered paths P1 and return paths P2 spaced apart from each other. Each layered path includes multiple transfer rollers, at least two of the multiple transfer rollers rotate in the same direction to form a unidirectional transfer section that bypasses the top or bottom of the two transfer rollers. The fibers entering the layered path bypass the transfer rollers and enter the unidirectional transfer section, and then pass through the transfer rollers to transfer to the large cylinder 2 to form the upper layered path P. 上 The fibers entering the layered path are directly transferred from the unidirectional transfer section to the large cylinder 2 to form the lower layered path P 下 , where the upper and lower hierarchical paths P 上 、P 下 The unidirectional transfer sections are located at the top and bottom and do not interfere with each other. The fibers are stretched and condensed during the transfer to form a fiber web layer, and the return path P2 is based on the upper layer path P 上 The transfer roller at the feeding end rotates in the same direction as the return roller 3 to perform fiber return.

[0043] In this example, the upper layer path P 上 There is one upper layer path P 上 A corresponding return path P2 is arranged.

[0044] Specifically, the upper layering path P1 includes a breast cylinder work roller 4, a first transfer roller 5, a second transfer roller 6, and a stripping roller 7, located between the breast cylinder 1 and the large cylinder 2 and arranged along the travel path. The first and second transfer rollers 5, 6 rotate in the same direction, and their upper portions form a unidirectional transfer section. This unidirectional transfer section prevents airflow generated by the rollers during the transfer between the upper and lower layering paths from interfering with or disrupting the fiber web transfer. Furthermore, this unidirectional transfer section not only undergoes a stretching process but also a condensation process, thereby improving the fiber web's quality. The bottom of the breast cylinder work roller 4 is located above and to the left of the first transfer roller 5, the second transfer roller 6 is located above and to the right of the first transfer roller 5, and the stripping roller 7 is located below and to the right of the second transfer roller 6. This four-roller layout not only creates the required unidirectional transfer section but also creates corresponding stretching and condensation combinations at different height differences to meet desired quality requirements (such as density).

[0045] The return roller 3 is located between the breast cylinder work roller 4 and the breast cylinder 1, and rotates in the same direction as the breast cylinder work roller 4. Due to this co-rotation, the stripping roller returns any fibers that may have remained on the breast cylinder work roller to the breast cylinder. The return roller 3 is tangential to the breast cylinder work roller 4 and the breast cylinder 1 from both sides. This tangential coordination not only achieves efficient fiber return, but also eliminates the impact of airflow generated by the breast cylinder work roller on the fibers to be separated on the breast cylinder.

[0046] The lower layering path P includes a middle doffer 8 and a middle transfer roller 9 at the bottom. The bottoms of the middle doffer 8 and middle transfer roller 9 form a one-way transfer section. The bottom layout of the one-way transfer section prevents the airflow generated by the rollers during the upper and lower layering paths from interfering with or disrupting the fiber web transfer. Furthermore, the one-way transfer section not only undergoes a stretching process but also a condensation process, thereby improving the quality of the fiber web. In some specific embodiments, the breast cylinder 1 and the middle doffer 8, the middle doffer 8 and the middle transfer roller 9, and the middle transfer roller 9 and the large cylinder 2 are tangentially matched. This roller-cutting coordination allows for the efficient transfer of the fiber layers.

[0047] In this example, the lower layer path P 下 Also includes a device provided between the chest cylinder 1 and the middle doffer 8 and a lower layer path P 下The windshield roller 10 is formed to block the feeding end. The windshield roller 10 is used to isolate the airflow to prevent the airflow from affecting the fiber transfer on the chest cylinder. The windshield roller 10 is located above the left side of the middle doffer 5 and can be set to rotate on its own, wherein the windshield roller 10 and the middle doffer 5 rotate in opposite directions, and the speed of the windshield roller 10 is adjustable based on the speed of the middle doffer 5. The self-rotation of the windshield roller can prevent the fibers from sticking or accumulating on the roller surface, keep the surface clean and assist in fiber transfer. For example, in a special single-roller transfer mechanism, the windshield roller strips the remaining fibers on the middle doffer at a higher speed. When used to strip fibers, Vwindshield>Vmiddle doffer (linear speed) must be satisfied to ensure that the fibers are transferred from the low-speed roller to the high-speed roller. If it is only used for windshield, the speed can be lower, but it still needs to rotate to avoid flower accumulation.

[0048] In addition, the discharge ends of each layered path are sequentially wound around the large cylinder 2 from bottom to top, and the discharge speed and direction are kept the same so that the inside and outside are bonded during stretching. Here, based on the limitations of speed and discharge direction, the traction force generated during the bonding process is relatively uniform, avoiding uneven force during bonding and damaging the quality of the transferred fiber web (such as uniformity). The breast cylinder 1 and the large cylinder 2 rotate in the same direction, and the discharge ends of each layered path are tangent to the large cylinder 2; and / or, the feed ends of each layered path are tangent to the breast cylinder 1. Based on the roller cutting coordination of the feed end and the discharge end, the fibers are peeled off from the breast cylinder in layers at the same angle and speed. At the same time, the stretched and condensed fiber web is transferred to the large cylinder at the same angle and speed, with each discharge end keeping the winding ends aligned and thickened layer by layer from the inside to the outside (this process involves not only stretching but also bonding). At the same time, the breast and main cylinders rotate in the same direction. Essentially, this speed gradient, in conjunction with the card clothing, achieves continuous, efficient fiber transfer with minimal fiber damage and high orientation, while also reducing energy consumption and losses. This design significantly impacts the uniformity, strength, and productivity of nonwoven materials. When the breast cylinder transfers the initially loosened fibers to the main cylinder, the movement of the two at the contact point (tangent point) must meet the following requirements: the breast cylinder surface speed is less than the main cylinder surface speed (e.g., 400 m / min for the breast cylinder and 800 m / min for the main cylinder; in short, the difference is at least two times). The speed gradient: The faster main cylinder speed generates a "pulling force" that gently pulls the fibers away from the lower-speed roller (breast cylinder) and attracts them to the surface of the card clothing. Motion coordination: Co-rotation ensures consistent fiber movement at the contact point, preventing fiber breakage caused by reverse pull.

[0049] In summary, the implementation steps of this embodiment are as follows:

[0050] S1, layered stretching and condensation

[0051] Based on the rotation of the chest cylinder, the fibers wound on the chest cylinder pass through the feeding end of each layering path in turn, and based on each feeding end, the layers are peeled off in turn and the fiber layers enter each layering path in turn, and the chest cylinder rotates unloaded. At the same time, the fibers entering the layering path go around the transfer roller into the unidirectional transfer section and then are transferred to the large cylinder through the transfer roller to form the upper layering path. The fibers entering the layering path are directly transferred from the unidirectional transfer section to the large cylinder to form the lower layering path. The unidirectional transfer sections of the upper and lower layering paths are located at the top and bottom and do not interfere with each other. The fibers are stretched and condensed during the transfer to form a fiber web layer, and the return roller rotating in the same direction as the transfer roller at the feeding end of the upper layering path performs fiber reflux.

[0052] S2, Fit

[0053] Based on the cooperation of the discharge speed, time and stroke of the upper and lower layered paths, the discharge speed of each layered path is kept equal, and the discharge time and stroke are changed to form a sequential discharge from bottom to top. As the large cylinder rotates, each discharge end keeps the winding end aligned and is transferred to the large cylinder from the inside to the outside with gradual thickening and bonding.

[0054] In step S2, the discharge speed formed by the lower layer path is V1, the discharge stroke is S1, and the time required for discharge is T1. The discharge speed formed by the upper layer path is V2, the discharge stroke is S2, and the time required for discharge is T2. The arc length formed by the material ends of the upper and lower layer paths is L, where V1=V2, S2-S1=L=ω×(T2-T1)×r, ω is the angular velocity of the large cylinder, and r is the radius of the large cylinder. In short, the arc length L can be directly obtained or directly obtained from the discharge stroke difference. ω and r are both known, so T2-T1 can be directly obtained. That is, at the same discharge speed, the discharge waiting time is formed based on the time difference, thereby achieving alignment of the fiber web ends. It should also be noted that this is only an optimal implementation method.

[0055] In summary, after adopting the fiber web transfer process of stretching, condensing and bonding in the fiber layered transfer, first, based on the rotation of the chest cylinder, the fibers wound on the chest cylinder pass through the feeding end of each layered path in turn, and based on each feeding end, the layers are peeled off in turn and the fiber layers enter each layered path in turn, and the chest cylinder rotates unloaded. At the same time, the fibers entering the layered path go around the transfer roller into the unidirectional transfer section and then pass through the transfer roller to the large cylinder to form the upper layered path. The fibers entering the layered path are directly transferred from the unidirectional transfer section to the large cylinder to form the lower layered path. The unidirectional transfer sections of the upper and lower layered paths are located at the top and bottom and do not interfere with each other. The fibers are stretched and shrunk during the transfer. The fibers are then recirculated by the transfer roller at the feeding end of the upper layered path in the same direction as the return roller. The discharge speed, time and stroke of the upper and lower layered paths are coordinated to keep the discharge speed of each layered path equal. The discharge time and stroke are changed to form a discharge sequence from bottom to top. As the large cylinder rotates, each discharge end keeps the winding end aligned and is transferred to the large cylinder from the inside to the outside in a layered and thickened manner. Therefore, on the one hand, the present invention is based on multiple transfer paths formed by layered stripping, which enables the breast cylinder to rotate at a low load. At the same time, the layered superimposed transfer is combined with the assisted return flow to complete the entire process of stretching, condensing and bonding the fibers. The transfer path can be selected based on the working conditions. At the same time, the layered transfer not only reduces the probability of fiber accumulation, entanglement and blockage, but also reduces the probability of neps and white spots due to insufficient fiber transfer. On the other hand, based on the top and bottom barriers of the one-way transfer section, the fibers are prevented from being disturbed by airflow during the condensation process, and the probability of insufficient or incomplete fiber transfer under airflow interference is also reduced. In addition, based on the constant web speed, the material sorting is controlled by time and stroke to complete the alignment and bonding of the winding ends. At the same time, the traction force during bonding is relatively balanced, eliminating the uneven thickness of the fiber web, improving the density and strength of the fiber web, and being suitable for the transfer of various fibers. The third aspect is based on multiple The design of the layered path not only forms a selective transfer mode to meet the transfer needs of different fibers; it also meets the combing and transfer needs of low-weight, high-speed cotton layers based on the upper and lower layer transfer method, with faster speed and higher quality. In addition, based on the backflow stripping, the fibers that may remain at the feeding end of the upper layer path are returned to the breast cylinder, reducing the probability of accumulation, entanglement and blockage at the feeding end of the upper layer path. Fourthly, based on the layout of the unidirectional transfer section, the airflow formed by the rollers in the transfer of the upper and lower layer paths is prevented from interfering with or damaging the fiber web transfer. In addition, the unidirectional transfer section not only has a stretching process but also a condensation process, thereby improving the quality of the fiber web.The fifth aspect is based on the layout of four rollers, which not only forms the required one-way transfer section, but also forms corresponding stretching and condensation combinations in different height differences to meet the required quality (such as density) requirements. At the same time, based on the return roller being tangent to the chest cylinder working roller and the chest cylinder on both sides, not only is the fiber return efficiency formed high, but it also eliminates the airflow generated by the chest cylinder working roller on the chest cylinder. The airflow affects the fiber to be layered on the chest cylinder. The sixth aspect is to use a windshield roller to isolate the airflow to avoid the airflow affecting the fiber transfer on the chest cylinder. At the same time, the windshield roller rotates by itself, which can prevent the fibers from sticking or accumulating on the roller surface, keeping the surface clean and assisting the fiber transfer. For example, in a special single-roller transfer mechanism, the windshield roller strips the remaining fibers on the middle doffer at a higher speed. When used to strip fibers, V windshield>V middle doffer (linear speed) must be met to ensure that the fibers are transferred from the low-speed roller to the high-speed roller. If it is only used for windshield, the speed can be lower, but it is still It needs to rotate to avoid flower accumulation; in the seventh aspect, the arc length L can be directly obtained or directly obtained from the discharge stroke difference (S2-S1), ω and r are both known, then T2-T1 can be directly obtained, that is, at the same discharge speed, the discharge waiting is formed based on the time difference, so as to realize the alignment of the fiber web ends. At the same time, it should be noted that it is only an optimal implementation method. In addition, based on the rotation of the large cylinder, the discharge ends of each layered path are wound around the large cylinder from bottom to top in sequence, and the discharge speed and direction are kept the same during stretching. The inside and outside are fitted together. Here, based on the speed and discharge direction restrictions, the traction force formed during the fitting process is relatively uniform, avoiding uneven force during fitting and destroying the quality of the transferred fiber web (such as uniformity); in the eighth aspect, the breast cylinder and the large cylinder rotate in the same direction, and the discharge ends of each layered path are tangent to the large cylinder; and / or, the feed ends of each layered path are tangent to the breast cylinder. The coordinated roller cutting at the infeed and outfeed ends allows fibers to be stripped layer by layer from the breast cylinder at the same angle and speed. Simultaneously, the stretched and condensed fiber web is transferred to the main cylinder at the same angle and speed, with the ends of each winding aligned and gradually thickened and bonded from the inside out. (This process involves both stretching and bonding.) Furthermore, the breast and main cylinders rotate in the same direction. Essentially, the speed gradient, in conjunction with the card clothing, achieves continuous fiber transfer with minimal damage, high fiber orientation, and high efficiency, while also reducing energy consumption and losses. This design significantly impacts the uniformity, strength, and productivity of nonwoven materials. Furthermore, when the breast cylinder transfers the initially opened fibers to the main cylinder, the movement of the two at the contact point (tangent point) must satisfy the following requirement: the breast cylinder surface linear velocity < the main cylinder surface linear velocity (e.g., breast cylinder speed 400 m / min, main cylinder speed 800 m / min; in short, the difference between the two should be at least two times). Speed ​​gradient: The faster linear speed of the large cylinder generates "traction" that gently peels the fibers from the low-speed roller (breast cylinder) and adsorbs them onto the surface of the card clothing. Motion coordination: Co-rotation ensures that the fibers at the contact point move in the same direction, preventing fibers from being pulled in the opposite direction and breaking.

[0056] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A fiber web transfer process that integrates stretching, condensation, and lamination in fiber layer transfer, wherein the transfer path used is located between a chest cylinder and a large cylinder arranged on the left and right sides, characterized in that: The transfer path includes an upper layer path, a lower layer path, and a return path, which are spaced apart from each other. The upper layer path includes a chest cylinder working roller, a first transfer roller, a second transfer roller, and a stripping roller, which are located between the chest cylinder and the large cylinder and arranged along the travel path. The first transfer roller and the second transfer roller rotate in the same direction, and the tops of the first transfer roller and the second transfer roller form a one-way transfer section. The lower layering path includes a middle doffer and a middle transfer roller at the bottom, wherein the bottoms of the middle doffer and the middle transfer roller form a one-way transfer section; the one-way transfer sections of the upper layering path and the lower layering path do not interfere with each other, and the return roller of the return path is located between the breast cylinder working roller and the breast cylinder and is tangent to the breast cylinder working roller and the breast cylinder from both sides. The process includes the following steps: S1, layered stretching and condensation Based on the rotation of the chest cylinder, the fibers wound on the chest cylinder pass through the feeding end of each layering path in turn, and based on each feeding end, the layers are peeled off in turn and the fiber layers enter each layering path in turn. The chest cylinder rotates unloaded, and at the same time, the fibers entering the layering path go around the transfer roller and enter the top unidirectional transfer section, and then pass through the transfer roller to transfer to the large cylinder to form the upper layering path. The fibers entering the layering path are directly transferred from the bottom unidirectional transfer section to the large cylinder to form the lower layering path, wherein the fibers are stretched and condensed during the transfer to form a fiber web layer, and the return roller rotating in the same direction as the chest cylinder working roller at the feeding end of the upper layering path is used to reflux the fibers. S2, Fit Based on the cooperation of the discharging speed, time and stroke of the upper and lower layered paths, the discharging speed of each layered path is kept equal, and the discharging time and stroke are changed to form a sequential discharge from bottom to top. As the large tin cylinder rotates, each discharging end keeps the winding end aligned and is transferred to the large tin cylinder from the inside to the outside with gradual thickening and bonding. The discharging speed formed by the lower layered path is V1, the discharging stroke is S1, and the time required for discharging is T1. The discharging speed formed by the upper layered path is V2, the discharging stroke is S2, and the time required for discharging is T2. The arc length formed by the material ends of the upper and lower layered paths is L, wherein V1=V2, S2-S1=L=ω×(T2-T1)×r, ω is the angular velocity of the large tin cylinder, and r is the radius of the large tin cylinder.

2. The fiber web transfer process of stretching, condensing and laminating in fiber layer transfer according to claim 1, characterized in that: In step S1 , there is at least one upper layer path, and a plurality of upper layer paths are arranged at intervals, wherein each upper layer path corresponds to a return flow path.

3. The fiber web transfer process of stretching, condensing and laminating in fiber layer transfer according to claim 1, characterized in that: The chest cylinder and the middle doffer, the middle doffer and the middle transfer roller, and the middle transfer roller and the large cylinder are tangentially matched.

4. The fiber web transfer process of stretching, condensing and laminating in fiber layer transfer according to claim 1, characterized in that: The lower layer path also includes a windshield roller which is arranged between the chest cylinder and the middle doffer and blocks the feeding end of the lower layer path.

5. The fiber web transfer process of stretching, condensing and laminating in fiber layer transfer according to claim 4, characterized in that: The windshield roller is located above and to the side of the middle doffer and can be arranged to rotate on its own, wherein the windshield roller and the middle doffer rotate in opposite directions, and the speed of the windshield roller is adjustable based on the speed of the middle doffer.

6. The fiber web transfer process of stretching, condensing and laminating in fiber layer transfer according to claim 1, characterized in that: In step S2, based on the rotation of the large cylinder, the discharge ends of each layered path are sequentially wound around the large cylinder from bottom to top, and the discharge speed and direction are kept the same so that the inside and outside are fitted together during stretching.

7. The fiber web transfer process of stretching, condensing and laminating in fiber layer transfer according to claim 1, characterized in that: The chest cylinder and the large cylinder rotate in the same direction, and the discharge end of each layer path is tangent to the large cylinder.

8. The fiber web transfer process integrating stretching, condensation and lamination in fiber layer transfer according to claim 1, characterized in that: The feeding end of each layered path is tangent to the breast cylinder.

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