FPC roll-to-roll exposure machine heavy roll device

Abstract

The utility model discloses FPC roll to roll exposure machine weight rewinding device, including rewinding frame, the surface fixed setting of rewinding frame has the fixing frame, and the active installation of fixing frame has rewinding roller, and the bottom fixed setting of rewinding frame has the guide rod, and the bottom fixed setting of guide rod has the base, and the outside installation of guide rod has the guide seat, and the surface fixed setting of guide seat has the weight frame, and the active installation of weight frame has the down roller, and the bottom fixed setting of weight frame has the counterweight weight. This FPC roll to roll exposure machine weight rewinding device, through the core logic of adjustable gravity pressure, has given consideration to three big advantages of pressure controllability, process adaptability, equipment reliability, especially suitable for FPC this kind of thin, soft, the extremely high flexibility FPC of flatness requirement, compared with pure tension control or complex electric control pressure device, and its cost is lower, and the operation is more flexible, can effectively solve the wrinkle, slack problem of winding link, promotes the quality consistency of final coiled material.

Description

Technical Field

[0001] This utility model relates to the field of FPC processing equipment, specifically to a counterweight rewinding device for an FPC roll-to-roll exposure machine. Background Technology

[0002] FPC (Flexible Printed Circuit Board) roll-to-roll exposure machines are core equipment in flexible circuit manufacturing for transferring photoresist patterns. Their core function is to transfer circuit patterns onto photoresist-coated flexible substrates (such as PI or PET films) through a continuous, high-precision exposure process. Their working principle can be divided into five core stages: unwinding, tension control, alignment, exposure, and rewinding. The roll-shaped flexible substrate (already coated with photoresist) is smoothly unwound by an unwinding mechanism (including a magnetic powder brake or servo motor), with the unwinding speed synchronized with subsequent stages to prevent substrate stretching or loosening. After the substrate is unwound, tension sensors monitor the process in real time. The tension value is measured and fed back to the control system (PLC or servo system). By adjusting the unwinding / rewinding power and tension roller pressure, the substrate is ensured to maintain constant tension during transmission (avoiding wrinkles or stretching) and to remain flat before entering the alignment stage. Before the substrate enters the exposure area, the reference marks (Mark points) on the substrate are identified by the CCD vision positioning system and compared with the reference marks on the mask (or laser direct writing pattern). The position of the substrate is adjusted by a precision servo motor (fine adjustment in the X / Y / θ directions) to achieve micron-level precise alignment between the pattern and the substrate (the accuracy usually needs to be controlled within ±5μm).

[0003] Rewinding is the final step in the roll-to-roll process. During the winding process, the surface tension of the FPC is prone to loosening. This loose tension prevents the FPC from maintaining flatness during transport and winding. When the FPC is wound on the rewinding roller, local loose areas are prone to folding and piling. When exposed to the folds, the FPC cannot adhere to the mask, resulting in blurred patterns and abnormal line widths. In subsequent etching and electroplating, local over-etching or under-plating is likely to occur, directly affecting the circuit conductivity. Utility Model Content

[0004] The purpose of this invention is to provide a counterweight rewinding device for an FPC roll-to-roll exposure machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, a counterweight rewinding device for an FPC roll-to-roll exposure machine is provided, comprising a rewinding frame, a fixed frame fixedly mounted on the surface of the rewinding frame, a rewinding roller movably mounted on the fixed frame, a guide rod fixedly mounted at the bottom of the rewinding frame, a base fixedly mounted at the bottom of the guide rod, a guide seat mounted on the outer side of the guide rod, a counterweight frame fixedly mounted on the surface of the guide seat, a lower pressure roller movably mounted on the counterweight frame, a counterweight fixedly mounted at the bottom of the counterweight frame, and FPCs mounted on the outer sides of both the rewinding roller and the lower pressure roller.

[0006] Preferably, two sets of guide rods are installed on both sides of the bottom of the rewinding frame. The guide rods are inserted into the guide holes opened on the guide seat, and the rewinding frame and the base are supported and fixed by four sets of guide rods.

[0007] Preferably, the lower pressure roller includes pressure roller A, pressure roller B, positioning groove and heating mechanism, and both pressure roller A and pressure roller B are hollow and are fixed together by screw connection.

[0008] Preferably, positioning grooves are provided on both sides of the inner wall of the pressure roller A and the pressure roller B, and a heating mechanism is installed inside the pressure roller A and the pressure roller B. The heating mechanism consists of a power supply box, an outer frame, a positioning seat and a heating plate.

[0009] Preferably, the outer frame is circular, and three sets of outer frames are evenly arranged. A heating plate is fixedly installed inside the three sets of outer frames. Two sets of positioning seats are provided on the outer circumference of each of the three sets of outer frames. The dimensions of the positioning seats and the positioning grooves are matched. The positioning seats are inserted into the inside of the positioning grooves. The heating mechanism is positioned and installed inside the pressure rollers A and B through the positioning grooves and positioning seats.

[0010] Preferably, the heating plate is spiral-shaped, and a power supply box is installed at the end of the heating plate, which is fixedly connected to the outer frame.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model utilizes the gravity of the lower pressure roller to act on the slack area, flattening it through friction with the transmission surface. Its response speed is much faster than that of electrically controlled pressing devices that rely on program control. It avoids "instantaneous wrinkles" caused by pressure adjustment lag, ensuring stable winding quality during high-speed production. Through the core logic of adjustable gravity pressing, it combines the advantages of pressure controllability, process adaptability, and equipment reliability, making it particularly suitable for thin, soft, and highly flat flexible FPCs. Compared to pure tension control or complex electrically controlled pressing devices, it is lower in cost and more flexible in operation, effectively solving wrinkle and slack problems in the winding process and improving the consistency of the final roll material quality.

[0013] 2. This utility model improves the winding quality of FPC from three dimensions: physical morphology correction, stress release, and residual material treatment through the design of a built-in heating mechanism in the lower pressure roller and the synergistic effect of heating softening and mechanical pressing. In particular, it solves the problems of stubborn wrinkles and internal stress deformation that are difficult to handle by simple mechanical pressing. At the same time, it enhances the adaptability of the process to the environment and the diversity of substrates, and ultimately reduces the defect rate of subsequent processes and improves the consistency of FPC products. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0015] Figure 2 for Figure 1 Cross-sectional view;

[0016] Figure 3 This is a cross-sectional view of the lower pressure roller of this utility model.

[0017] Figure 4 This is a rear view of the lower pressure roller of this utility model.

[0018] Figure 5 This is a schematic diagram of the heating mechanism of this utility model.

[0019] The following are the labeling elements in the diagram: 1. Rewinding frame; 2. Guide rod; 3. Fixing frame; 31. Rewinding roller; 4. Guide seat; 5. Base; 6. Counterweight frame; 61. Counterweight; 7. Lower pressure roller; 71. Pressure roller A; 72. Pressure roller B; 73. Positioning groove; 74. Heating mechanism; 741. Power supply box; 742. Outer frame; 743. Positioning seat; 744. Heating plate; 8. FPC. Detailed Implementation

[0020] Please see Figure 1-5 This utility model provides a counterweight rewinding device for an FPC roll-to-roll exposure machine, including a rewinding frame 1, a fixing frame 3 fixedly mounted on the surface of the rewinding frame 1, a rewinding roller 31 movably mounted on the fixing frame 3, a guide rod 2 fixedly mounted at the bottom of the rewinding frame 1, a base 5 fixedly mounted at the bottom of the guide rod 2, a guide seat 4 mounted on the outer side of the guide rod 2, a counterweight frame 6 fixedly mounted on the surface of the guide seat 4, a lower pressure roller 7 movably mounted on the counterweight frame 6, a counterweight 61 fixedly mounted at the bottom of the counterweight frame 6, and FPCs 8 mounted on the outer sides of both the rewinding roller 31 and the lower pressure roller 7.

[0021] Working principle: Before being wound by the rewinding roller 31, the FPC8 first passes through the pressure roller 7. The pressure roller 7 and its two sets of counterweights 61 at its bottom press down on the FPC8, making it compact. After being wound on the rewinding roller 31, the FPC8 is less prone to surface tension loosening during the winding process. The FPC8 remains flat during transport and winding, and no local slack areas are formed when it is wound on the rewinding roller 31. The weight of the pressure roller 7 can be flexibly adjusted by the counterweights 61 at the bottom of the counterweight frame 6. For thinner or easily deformable FPC8, the weights can be reduced to lower the pressure and avoid excessive compression that could cause the FPC8 to stretch. For thicker FPC8 or FPC8 with lower surface tension, the weights can be increased to raise the pressure, ensuring that the FPC8 fits tightly against the transmission surface and eliminating localized slack. Compared to a fixed-pressure clamping device, the gravity adjustment of the counterweight 61 is more intuitive and stable. The lower pressure roller 7 applies continuous and uniform pressure to the FPC8 to be wound up using its own gravity, which can flatten the small slack areas on the surface of the FPC8 and prevent slack parts from being exposed when entering the rewinding roller 31. Tension variations can cause wrinkles or stacking; especially in roll-to-roll processes, where excessive spacing between guide rollers and the weight of the FPC8 itself can cause localized slack, the pressure roller 7 can flatten the FPC8 in real time, ensuring flatness upon entering the take-up roller and reducing the risk of edge misalignment during subsequent rewinding; during high-speed rewinding of the FPC8, slack or fluctuations may occur instantaneously, but the gravity-type pressure roller 7 has no adjustment delay: once localized slack occurs in the FPC8, the gravity of the pressure roller 7 will immediately act on the slack area, flattening it through friction with the conveyor surface, with a rapid response. It is much faster than electric clamping devices that rely on program control; it avoids "instant wrinkles" caused by pressure adjustment lag, ensuring stable winding quality during high-speed production; through the core logic of adjustable gravity clamping, it takes into account the three major advantages of pressure controllability, process adaptability, and equipment reliability, and is especially suitable for thin, soft, and highly flat flexible FPC8 such as FPC8; compared with pure tension control or complex electric clamping devices, it has lower cost and more flexible operation, and can effectively solve the wrinkle and loosening problems in the winding process, improving the quality consistency of the final roll material.

[0022] In a preferred embodiment, two sets of guide rods 2 are installed on both sides of the bottom of the rewinding frame 1. The guide rods 2 are inserted into the guide holes opened on the guide seat 4. The rewinding frame 1 and the base 5 are supported and fixed by four sets of guide rods 2.

[0023] The lower pressure roller 7 includes pressure roller A71, pressure roller B72, positioning groove 73 and heating mechanism 74. Both pressure roller A71 and pressure roller B72 are hollow and are fixed together by screws.

[0024] In a preferred embodiment, positioning grooves 73 are provided on both sides of the inner wall of pressure roller A71 and pressure roller B72. A heating mechanism 74 is installed inside pressure roller A71 and pressure roller B72. The heating mechanism 74 consists of a power supply box 741, an outer frame 742, a positioning seat 743 and a heating plate 744.

[0025] The outer frame 742 is circular, and three sets of the outer frame 742 are evenly arranged. A heating plate 744 is fixedly installed inside the three sets of outer frames 742. Two sets of positioning seats 743 are provided on the outer circumference of each of the three sets of outer frames 742. The dimensions of the positioning seats 743 and the positioning grooves 73 are matched. The positioning seats 743 are inserted into the inside of the positioning grooves 73. The heating mechanism 74 is positioned and installed inside the pressure rollers A71 and B72 through the positioning grooves 73 and the positioning seats 743.

[0026] The heating plate 744 is spiral-shaped, and a power supply box 741 is installed at the end of the heating plate 744. The power supply box 741 is fixedly connected to the outer frame 742.

[0027] like Figure 3 , Figure 4 and Figure 5 As shown: A heating mechanism 74 is installed inside the lower pressure roller 7, and a heating plate 744 is provided on the heating mechanism 74. The heating plate 744 can heat the surface of the lower pressure roller 7. After the heating plate 744 heats the surface of the lower pressure roller 7, the heat is transferred to the surface of the FPC8 substrate through the lower pressure roller 7, causing the flexible substrate to soften slightly due to heat, improving the material's ductility and plasticity. At this time, combined with the gravity pressing of the lower pressure roller 7, it can more efficiently smooth out stubborn wrinkles on the substrate surface caused by internal stress or uneven transmission. The softened substrate is more likely to adhere to the transmission surface under pressure, and after the molecular chains rearrange, it cools and solidifies, reducing the possibility of wrinkle recurrence. Especially for FPC8 with thicker thickness or greater internal stress after multiple processing, the synergistic effect of heating and pressing improves the flattening efficiency compared to simple mechanical pressing. When the heated lower pressure roller 7 presses the FPC8, it can slightly increase the surface temperature of the substrate. This promotes tighter adhesion between the substrate and the inner layers of the roll during winding: For FPC8 with a surface coating of photoresist or protective film, appropriate heating can reduce the surface tension of the coating and enhance interlayer adhesion; for bare copper foil or metallized layers, heating can reduce residual moisture on the substrate surface and prevent gaps from forming between layers due to moisture barrier; ultimately reducing interlayer slippage and bulging problems after winding, making the roll structure more stable and the substrate less prone to misalignment during subsequent unfolding; the design of the heating mechanism 74 built into the lower pressure roller 7 improves the winding quality of FPC8 from three dimensions: physical morphology correction, stress release, and residual material treatment through the synergistic effect of heating softening and mechanical pressing. In particular, it solves the problems of stubborn wrinkles and internal stress deformation that are difficult to handle by simple mechanical pressing, while enhancing the process's adaptability to the environment and substrate diversity, ultimately reducing the defect rate of subsequent processes and improving the consistency of FPC8 products.

Claims

1. A rewinding device for an FPC roll-to-roll exposure machine, comprising a rewinding frame (1), characterized in that: A fixed frame (3) is fixedly installed on the surface of the rewinding frame (1), and a rewinding roller (31) is movably installed on the fixed frame (3). A guide rod (2) is fixedly installed at the bottom of the rewinding frame (1), and a base (5) is fixedly installed at the bottom of the guide rod (2). A guide seat (4) is installed on the outside of the guide rod (2), and a counterweight frame (6) is fixedly installed on the surface of the guide seat (4). A lower pressure roller (7) is movably installed on the counterweight frame (6), and a counterweight (61) is fixedly installed at the bottom of the counterweight frame (6). An FPC (8) is installed on the outside of both the rewinding roller (31) and the lower pressure roller (7).

2. The FPC roll-to-roll exposure machine counterweight rewinding device according to claim 1, characterized in that: Two sets of guide rods (2) are installed on both sides of the bottom of the rewinding frame (1). The guide rods (2) are inserted into the guide holes opened on the guide seat (4). The rewinding frame (1) and the base (5) are supported and fixed by four sets of guide rods (2).

3. The FPC roll-to-roll exposure machine counterweight rewinding device according to claim 1, characterized in that: The lower pressure roller (7) includes pressure roller A (71), pressure roller B (72), positioning groove (73) and heating mechanism (74). Pressure roller A (71) and pressure roller B (72) are both hollow and are fixed together by screws.

4. The FPC roll-to-roll exposure machine counterweight rewinding device according to claim 3, characterized in that: The inner walls of the pressure rollers A (71) and B (72) are provided with positioning grooves (73). The pressure rollers A (71) and B (72) are equipped with heating mechanisms (74). The heating mechanism (74) consists of a power supply box (741), an outer frame (742), a positioning seat (743), and a heating plate (744).

5. The FPC roll-to-roll exposure machine counterweight rewinding device according to claim 4, characterized in that: The outer frame (742) is circular, and three sets of the outer frame (742) are evenly arranged. A heating plate (744) is fixedly arranged inside the three sets of outer frames (742). Two sets of positioning seats (743) are arranged on the outer circumference of the three sets of outer frames (742). The size of the positioning seat (743) and the positioning groove (73) are matched. The positioning seat (743) is inserted into the inside of the positioning groove (73). The heating mechanism (74) is positioned and installed inside the pressure roller A (71) and pressure roller B (72) through the positioning groove (73) and the positioning seat (743).

6. The FPC roll-to-roll exposure machine counterweight rewinding device according to claim 5, characterized in that: The heating plate (744) is spiral-shaped, and a power supply box (741) is installed at the end of the heating plate (744). The power supply box (741) is fixedly connected to the outer frame (742).

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