Film winding and pressing roller structure
By designing a suspended pressure roller assembly and compensation and adaptive components, the problems of uneven pressing and roll diameter variation during film winding were solved, achieving stability and adaptability in end face neatness and interlayer tightness of film winding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUANGSHAN NOVEL
- Filing Date
- 2025-06-24
- Publication Date
- 2026-07-10
AI Technical Summary
In the existing film winding process, the pressure applied to different parts of the film is distributed at intervals, resulting in uneven winding ends and difficulty in adapting to changes in roll diameter, which affects the neatness and interlayer tightness of the roll material.
The design incorporates a suspended pressure roller assembly, with the roller axis arranged parallel to the winding axis. The effective contact length of the roller exceeds the film width, and dynamic adjustment is achieved through compensation and adaptive components to ensure the stability and adaptability of the pressing action.
It suppresses edge stress relaxation during film winding, ensures the consistency of roll end face neatness and interlayer tightness, reduces drive energy consumption, and improves system adaptability.
Smart Images
Figure CN224477676U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of film winding technology, and specifically to a film winding pressure roller structure. Background Technology
[0002] BOPP cigarette film, also known as biaxially oriented polypropylene cigarette film, or simply cigarette film, is made by co-extrusion and stretching of various polypropylene functional materials. Domestic manufacturers generally use a three-layer co-extrusion technology to produce high-performance BOPP cigarette film through biaxial stretching. This film features high transparency and gloss, is non-toxic, has a stable molecular structure, and offers some barrier properties against odors and moisture, making it an ideal material for cigarette packaging.
[0003] Generally, in the process of winding the tobacco film after it has been cut, multiple sets of supports are evenly distributed at the winding position of the winding shaft. Each set of supports is equipped with a pressure roller, the axis of which is parallel to the axis of the winding shaft. These multiple pressure rollers apply radial pressure to the film, ensuring stable winding and preventing wrinkles and air from entering the film during the winding process. This process can be achieved by... Figure 1 In the diagram, a represents the winding shaft, b represents the film, 101 represents the support, and 102 represents the pressure roller.
[0004] Based on the above-mentioned method of applying pressure to the winding shaft by multiple sets of pressure rollers, it has been found in practical applications that, since there is a certain installation distance between any two adjacent pressure rollers, the installation distance will not exert a pressure on the film. During the winding process, the pressure on different parts of the film is distributed in an intermittent manner, which results in uneven winding end faces of the film.
[0005] To address these issues, we propose a film winding pressure roller structure. Utility Model Content
[0006] The purpose of this invention is to solve the problems in the prior art by proposing a film winding pressure roller structure. Through the design of the suspended pressure roller assembly, the winding shaft and the pressure roller axis are aligned and parallel. The effective contact length of the pressure roller exceeds the width of the film, forming an axial full-coverage line contact pressing interface. This can suppress the phenomenon of edge stress relaxation during winding and ensure the consistency of the neatness of the roll end face and the tightness between layers.
[0007] To solve the above problems, this utility model provides the following technical solution:
[0008] A film winding pressure roller structure includes a pressure roller assembly suspended above a winding shaft. The pressure roller assembly includes two sets of parallel mounting plates and a pressure roller rotatably disposed inside the two mounting plates. The rotation axis of the pressure roller is arranged parallel to the rotation axis of the winding shaft, so that when the winding shaft winds the film, the pressure roller applies a pressing action against the film toward the winding shaft, and the effective contact length of the pressure roller is greater than the width of the film.
[0009] As a further embodiment of this utility model, the pressure roller structure also includes a compensation component suspended above the pressure roller assembly. The compensation component includes a support bracket, and both mounting plates are slidably mounted on the support bracket in the vertical direction so that the pressure roller can move vertically upward as the film roll diameter on the take-up shaft dynamically increases.
[0010] As a further embodiment of this utility model, the compensation component further includes a first elastic element disposed on the support bracket and fixedly connected to the mounting plate, so that when the pressure roller moves vertically upward along the winding shaft as the film roll diameter dynamically increases, the first elastic element is compressed and applies a vertical downward force to the pressure roller.
[0011] As a further embodiment of this utility model: the first elastic element is a first reset spring, and the two ends of the first reset spring are respectively fixedly connected to the bearing bracket and the mounting plate.
[0012] As a further embodiment of this utility model: the pressure roller structure also includes an adaptive component disposed above the pressure roller assembly. The adaptive component includes a shaft, and the axial direction of the shaft is arranged parallel to the axial direction of the pressure roller. The mounting plate is composed of a vertical part and a curved part connected to the vertical part, and the vertical part and the curved part are arranged at an angle. The curved part is rotatably disposed on the shaft, and the vertical part is used for mounting the pressure roller, so that the pressure roller has a first working state and a second working state. When the pressure roller is in the first working state, the direction of the line connecting the rotation axis of the pressure roller and the rotation axis of the take-up shaft is arranged vertically. When the pressure roller is in the second working state, the rotation axis of the pressure roller deviates from the vertical position of the rotation axis of the take-up shaft.
[0013] As a further embodiment of this utility model, the adaptive component further includes a second elastic element disposed on the shaft and fixedly connected to the mounting plate, so that when the pressure roller switches from the first working state to the second working state, the second elastic element is stretched and applies a pull-back action to the pressure roller.
[0014] As a further embodiment of this utility model: the second elastic element is a second return spring, and the two ends of the second return spring are fixedly connected to the shaft and the vertical part, respectively.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] 1. This structure uses a suspended pressure roller assembly design to make the winding shaft and the pressure roller axis parallel and aligned. The design of the pressure roller effectively abuts beyond the width of the film, forming an axially full-coverage line contact pressing interface, which can suppress edge stress relaxation during winding and ensure the consistency of the neatness of the roll end face and the tightness between layers.
[0017] 2. The compensation component adopts a vertical sliding constraint mechanism. Through the cooperation of the mounting plate and the linear slide rail pair of the bearing bracket, the pressure roller has a vertical displacement degree of freedom that dynamically increases with the roll diameter. This design can track the change of the outer diameter of the take-up shaft in real time, maintain a constant contact pressure between the pressure roller and the surface of the roll material, avoid pressure attenuation or overload caused by the increase of the roll diameter, and significantly improve the system's adaptability to the fluctuation of the roll material thickness.
[0018] 3. The compensation component integrating the first elastic element converts mechanical displacement into controllable elastic potential energy, generating a progressive reaction force through elastic compression during the vertical lifting of the pressure roller. This mechanism achieves linear coupling control of pressure and displacement, avoiding impact loads caused by rigid contact, and enabling precise matching of different process pressure curves through elastic coefficient adjustment, significantly reducing drive energy consumption and control system complexity.
[0019] 4. The adaptive component constructs a multi-degree-of-freedom posture adjustment system through the bending section-axis rotation joint, allowing the pressure roller to switch between the initial vertical alignment state and the working deflection state. The first working state ensures the normal load accuracy of the basic winding process, while the second working state forms dynamic wrap angle compensation through axis offset, effectively dealing with centrifugal effects or sudden changes in roll tension during high-speed winding and preventing interlayer slippage defects.
[0020] 5. The introduction of the second elastic element gives the adaptive component a passive reset function. When the pressure roller deviates from the normal position due to the increase in the film roll diameter, the pull-back torque generated by the elastic stretching can automatically restore the system to equilibrium. This design achieves self-stabilizing adjustment of the winding pressure system without the need for external sensors and control units, ensuring a stable and balanced vertical pressing action applied by the pressure roller to the film tangent. Attached Figure Description
[0021] The present invention will be further described below with reference to the accompanying drawings.
[0022] Figure 1 This is a schematic diagram of the pressure roller structure in the prior art;
[0023] Figure 2 This is a structural schematic diagram of Embodiment 1 of the present invention;
[0024] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model;
[0025] Figure 4 This is a schematic diagram of the first working state structure of Embodiment 2 of this utility model;
[0026] Figure 5 This is a schematic diagram of the second working state structure of Embodiment 2 of this utility model.
[0027] In the diagram: 101, support; 102, pressure roller; a, take-up shaft; b, film;
[0028] 1. Mounting plate; 1011. Vertical part; 1012. Bending part; 2. Pressure roller; 3. Bearing bracket; 4. First elastic element; 5. Shaft; 6. Second elastic element. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0030] like Figures 2-5 As shown, a film winding pressure roller structure includes a pressure roller assembly suspended above a winding shaft a. The pressure roller assembly includes two sets of parallel mounting plates 1. A pressure roller 2 is rotatably mounted on the inner side of the two mounting plates 1. The rotation axis of the pressure roller 2 is parallel to the rotation axis of the winding shaft a. The pressure roller 2 abuts against the winding shaft a, and the effective length of the contact between the pressure roller 2 and the winding shaft a is greater than the width of the film b on the winding shaft a, so as to ensure that all parts of the film b can be pressed by the pressure roller 2. Compared with the intermittent pressing effect of multiple separate pressure rollers 102 in the prior art, the integrated pressure roller 2 designed in this application can apply a pressing effect to all parts of the film b on the winding shaft a, avoiding the uneven winding end face of the film b caused by multiple separate pressure rollers 102 during the pressing process, so that the end faces of the wound and collected film roll are flush.
[0031] As the diameter of the film roll gradually increases during the winding process of the winding shaft a around the film b, this application proposes the following two methods to adapt to different winding conditions:
[0032] Example 1:
[0033] This application also includes a compensation component, which is disposed above the pressure roller assembly. The compensation component includes a support bracket 3, which is used for sliding installation of the two mounting plates 1 in the vertical direction. That is, under this design, the pressure roller 2 is in normal contact with the top of the take-up shaft a. Under the vertical movable installation design of the mounting plates 1, as the diameter of the film roll wound by the take-up shaft a dynamically increases, the pressure roller 2 will also be subjected to an upward pushing force while rotating. This pushing force is the reaction force of the pressure roller 2 against the film b. This state can be achieved by... Figure 2 To represent it.
[0034] When the two mounting plates 1 are made of lightweight materials, the pressing force exerted on the film b by the pressure roller 2 is the weight of the pressure roller 2 itself. As the diameter of the film roll gradually increases, it is difficult for the pressure roller 2 to press the film b against itself using its own weight. Therefore, the compensation assembly also includes a first elastic element 4 mounted on the support bracket 3 and fixedly connected to the mounting plate 1. This allows for upward dynamic compensation of the pressure roller 2 as it moves vertically upward along the winding shaft a as the diameter of the film b on the winding shaft a dynamically increases, preventing the constant position of the pressure roller 2 from interfering with the winding of the film b. During this upward compensation process of the pressure roller 2, the first elastic element 4 is compressed. This compression applies a downward vertical force to the pressure roller 2. That is, the film b is subjected to the weight of the pressure roller 2 and the downward resetting force of the first elastic element 4. The combined force of these two forces presses the film b against itself. Furthermore, as the diameter of the film roll gradually increases, the combined force also dynamically increases, better adapting to the winding process.
[0035] Preferably, the first elastic element 4 can be a first reset spring, and the two ends of the first reset spring are fixedly connected to the bearing bracket 3 and the mounting plate 1, respectively.
[0036] Example 2:
[0037] In Example 1, the compensation method for the vertically upward movement of the pressure roller 2 results in a greater upward movement distance for the film roll to be wound if the diameter of the film roll is large. Based on the deformation characteristics of the first elastic element 4, the amount of compression it undergoes increases. Therefore, the pressure exerted by the pressure roller 2 on the film b increases with the increase in the film roll diameter. When this pressure exceeds a certain limit, such as exceeding the pressure resistance limit of the film b, it will damage the surface of the film b. Furthermore, during subsequent winding, the greater pressure will cause dents in the film roll, resulting in significant quality defects in the finished film roll. Therefore, the compensation method in Example 1 can only apply pressure during film winding within a certain diameter range.
[0038] This embodiment differs from the compensation method in Embodiment 1. This embodiment improves upon the two mounting plates 1, which consist of a vertical portion 1011 and a curved portion 1012 connected to the vertical portion 1011, with the vertical portion 1011 and the curved portion 1012 arranged at an angle. Simultaneously, a shaft 5 is added above the pressure roller 2, with its axial direction parallel to the axial direction of the pressure roller 2. The curved portion 1012 is rotatably mounted on the shaft 5, and the pressure roller 2 is mounted on the vertical portion 1011. This configuration can be achieved by… Figure 3 To represent this. Based on the settings of this embodiment, the initial state of the pressure roller 2 is determined by... Figure 4 The operating status of pressure roller 2 is determined by... Figure 5 The initial state of the pressure roller 2 is recorded as the first working state, and the running state of the pressure roller 2 is recorded as the second working state. Figure 4 In the indicated state, the pressure roller 2 presses against the top of the take-up shaft a, and the line connecting the rotation axis of the pressure roller 2 and the rotation axis of the take-up shaft a is arranged vertically. That is, the pressing action of the pressure roller 2 against the top of the take-up shaft a is a normal direction, with the normal direction being... Figure 4 and Figure 5 Line A in the diagram represents this. At this point, the winding process begins. As the diameter of the film roll on the winding shaft a gradually increases, the pressure roller 2 is adaptively lifted and crosses the normal direction. This state can be determined by... Figure 5 This adaptive pressing method means that the pressure exerted on the film roll by the pressure roller 2 is the weight of the roller itself. However, since the roller 2 will cross the normal direction, the perpendicular pressing force of the roller 2 on the tangent of the film b is only a component of its own weight. The direction of the gravity of the roller 2 can be represented by line B, and the direction of the roller 2 perpendicularly contacting the tangent of the film b can be represented by line C.
[0039] Therefore, as the diameter of the film roll gradually increases, causing the vertical pressing effect of the pressure roller 2 on the tangent of the film b to gradually decrease, this embodiment of the adaptive component also includes a second elastic element 6 disposed on the shaft 5 and fixedly connected to the mounting plate 1, so that when the pressure roller 2 switches from the first working state to the second working state, the second elastic element 6 is stretched and applies a pull-back effect to the pressure roller 2. Specifically, with Figure 5 As shown, the direction of the pull-back action is from right to left, which will apply a leftward pulling force to the mounting plate 1. The mounting plate 1 will drive the pressure roller 2 to rotate clockwise. Therefore, the pressure roller 2 will increase its resistance and pressing effect on the film b under this trend, ensuring that the resistance and pressing effect of the pressure roller 2 on the film b will not decrease during the adaptive follow-up process.
[0040] Preferably, the second elastic element 6 is a second return spring, and the two ends of the second return spring are fixedly connected to the shaft 5 and the vertical part 1011, respectively.
[0041] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.
Claims
1. A film winding pressure roller structure, characterized in that, The device includes a pressure roller assembly suspended above a take-up shaft (a). The pressure roller assembly includes two sets of parallel mounting plates (1) and a pressure roller (2) rotatably disposed inside the two mounting plates (1). The rotation axis of the pressure roller (2) is arranged parallel to the rotation axis of the take-up shaft (a) so that when the take-up shaft (a) winds the take-up film (b), the pressure roller (2) applies a pressing action against the film (b) toward the take-up shaft (a), and the effective contact length of the pressure roller (2) is greater than the width of the film (b).
2. The film winding pressure roller structure according to claim 1, characterized in that, The pressure roller structure also includes a compensation component suspended above the pressure roller assembly. The compensation component includes a support bracket (3), and two mounting plates (1) are slidably mounted on the support bracket (3) in the vertical direction so that the pressure roller (2) can move vertically upward as the diameter of the film (b) on the take-up shaft (a) increases dynamically.
3. The film winding pressure roller structure according to claim 2, characterized in that, The compensation assembly also includes a first elastic element (4) disposed on the support bracket (3) and fixedly connected to the mounting plate (1), so that when the pressure roller (2) moves vertically upward as the diameter of the film (b) roll on the take-up shaft (a) increases dynamically, the first elastic element (4) is compressed and exerts a vertical downward force on the pressure roller (2).
4. The film winding pressure roller structure according to claim 3, characterized in that, The first elastic element (4) is a first reset spring, and the two ends of the first reset spring are fixedly connected to the bearing bracket (3) and the mounting plate (1) respectively.
5. The film winding pressure roller structure according to claim 1, characterized in that, The pressure roller structure also includes an adaptive component located above the pressure roller assembly. The adaptive component includes a shaft (5), and the axial direction of the shaft (5) is arranged parallel to the axial direction of the pressure roller (2). The mounting plate (1) is composed of a vertical part (1011) and a curved part (1012) connected to the vertical part (1011). The vertical part (1011) and the curved part (1012) are arranged at an angle. The curved part (1012) is rotatably mounted on the shaft (5). The vertical part (1011) is used for mounting the pressure roller (2) so that the pressure roller (2) has a first working state and a second working state. When the pressure roller (2) is in the first working state, the rotation axis of the pressure roller (2) and the rotation axis of the take-up shaft (a) are arranged vertically. When the pressure roller (2) is in the second working state, the rotation axis of the pressure roller (2) is deviated from the vertical position of the rotation axis of the take-up shaft (a).
6. The film winding pressure roller structure according to claim 5, characterized in that, The adaptive component also includes a second elastic element (6) disposed on the shaft (5) and fixedly connected to the mounting plate (1), so that when the pressure roller (2) switches from the first working state to the second working state, the second elastic element (6) is stretched and applies a pull-back action to the pressure roller (2).
7. The film winding pressure roller structure according to claim 6, characterized in that, The second elastic element (6) is a second return spring, and the two ends of the second return spring are fixedly connected to the shaft (5) and the vertical part (1011) respectively.