Dyeing device for PVA (Polyvinyl Alcohol) film of polaroid

Abstract

The utility model relates to the technical field of PVA (Polyvinyl Alcohol) film production equipment, in particular to a dyeing device for a PVA film of a polaroid. The dye box comprises a dye box body, supporting plates are fixed to the two sides of one end of the top end of the dye box body, a first guide roller is rotationally connected between the two supporting plates, guide plates are fixed to the two sides of the top end of the dye box body, and L-shaped plates are slidably connected to the inner sides of the guide plates. According to the dyeing device for the PVA film of the polaroid, the pressing mechanism is started to effectively apply pressure to the PVA film, and the PVA film is effectively soaked in dye, so that the PVA film is effectively and uniformly dyed, and the dyeing quality of the PVA film is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of PVA film production equipment, and in particular to a dyeing device for polarizing PVA film. Background Technology

[0002] PVA film is made of polyvinyl alcohol. Polyvinyl alcohol film has a density of 1.26-1.29 g / cm³, a refractive index of 1.52, and emits a bluish-white light when exposed to ultraviolet light. It is highly absorbent and dissolves in water. The moisture content of the fibers can reach 30%-50%, and even at 65% RH and 25°C, the moisture content can reach 4.5%. It allows water vapor to pass through, but has difficulty passing through alcohol vapor, and is even less permeable to organic solvent vapors, inert gases, and hydrogen. The barrier properties of polyvinyl alcohol film are even better than those of vinylidene chloride film.

[0003] When using the above technology, the following technical problems were found in the existing technology: In the production process of polarizing plates, the dyeing process of PVC film is crucial. The currently commonly used spray dyeing and manual immersion dyeing technologies have the following key problems;

[0004] Existing methods are insufficient to achieve deep dye penetration, resulting in uneven film coloring and affecting the consistency of optical performance.

[0005] The dye distribution exhibits significant gradient differences, which can easily lead to areas with excessively high or low concentrations, thus reducing product yield.

[0006] 3. The lack of a precise film tension pressing mechanism leads to film deformation or wrinkling during the dyeing process, resulting in stripes or mottled defects. To address this, we designed a dyeing device for polarizing PVA film to provide an alternative technical solution to the above-mentioned technical problems. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A dyeing apparatus for a polarizing PVA film includes a dye box. Support plates are fixed to both sides of one top end of the dye box. A guide roller is rotatably connected between the two support plates. Guide plates are fixed to both sides of the top end of the dye box. L-shaped plates are slidably connected to the inner sides of the guide plates. A pressure roller is rotatably connected between the two L-shaped plates. A drying chamber is fixed to the other top end of the dye box. A heating rod is mounted on the top of the inner side of the drying chamber. Pressure mechanisms for applying pressure to the PVA film are provided on both sides of the dye box.

[0009] In a preferred embodiment of the dyeing device for a polarizing PVA film provided by this utility model, support blocks are fixed on both sides of the dye box at the top and between the guide plate and the drying box, and an auxiliary roller is rotatably connected to the bottom of the two support blocks.

[0010] In a preferred embodiment of the dyeing device for polarizing PVA film provided by this utility model, a guide groove is provided at the top of the support block, a pressure roller is slidably connected to the inner side of the guide groove, and springs are fixed at the bottom ends on both sides of the pressure roller, with the bottom ends of the springs fixed to the auxiliary roller.

[0011] In a preferred embodiment of the dyeing device for polarizing PVA film provided by this utility model, the pressing mechanism includes a lead screw, a driven bevel gear, a main bevel gear, and a servo motor. Lead screws are rotatably connected to both sides of the dye box. The outer side of the lead screw is threaded to an L-shaped plate. The bottom ends of the two lead screws are rotatably connected by a transmission belt. A driven bevel gear is fixed to the bottom end of the outer side of one of the lead screws. A servo motor is mounted on one side of the dye box. A main bevel gear is fixed to the output end of the servo motor. The bottom end of the main bevel gear is meshed with the driven bevel gear.

[0012] In a preferred embodiment of the dyeing device for polarizing PVA film provided by this utility model, guide rollers are rotatably connected to both ends of the inner side of the drying box, an extension roller is slidably connected to the bottom of the inner side of the drying box, and slide blocks are rotatably connected to both sides of the extension roller. The inner side of the slide block is slidably connected to the drying box. Limiting grooves are provided at the top and bottom of both sides of the drying box, and a pin is slidably connected to one end of the inner side of the slide block. The pin is slidably connected to the corresponding limiting groove.

[0013] In a preferred embodiment of the dyeing apparatus for polarizing PVA film provided by this utility model, two fans are installed at the top of the drying oven.

[0014] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0015] At the same time, through the above technical solutions, this utility model has at least the following beneficial effects:

[0016] This utility model provides a dyeing device for polarizing PVA film. By starting a servo motor, the main bevel gear and the driven bevel gear are rotated. The driven bevel gear drives one of the lead screws to rotate. At this time, the transmission belt effectively synchronizes the rotation of the two lead screws. The lead screw drives the L-shaped plate and the lower pressure roller to press down on the PVA film, thereby effectively pressing the PVA film into the inside of the dye box for immersion. It also effectively increases the tension of the PVA film, which helps to ensure the flatness and smoothness of the PVA film.

[0017] When one end of the PVA film passes through the inside of the drying chamber, the pin is pulled to disengage from the corresponding limiting groove. This causes the sliding slide to move the extension roller parallel to the guide roller 2. At this point, one end of the PVA film passes through one of the guide roller 2, then through the extension roller, and finally exits onto the other guide roller 2. Then, the sliding slide is moved to move the extension roller downward, applying tension to the PVA film. This causes the PVA film inside the drying chamber to form a V-shape. As a result, the heating rod is activated to heat the film, and the fan is activated to blow the heat generated by the heating rod onto the PVA film. The V-shaped PVA film effectively increases the drying effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the top of the dye box of this utility model;

[0021] Figure 3 This is a schematic diagram of the pressing mechanism of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the drying oven of this utility model.

[0023] In the diagram: 1. Dye box; 2. Support plate; 3. Guide roller one; 4. Guide plate; 5. Lead screw; 6. L-shaped plate; 7. Lower pressure roller; 8. Driven bevel gear; 9. Main bevel gear; 10. Servo motor; 11. Support block; 12. Auxiliary roller; 13. Spring; 14. Pressure roller; 15. Guide groove; 16. Fan; 17. Drying oven; 18. Heating rod; 19. Guide roller two; 20. Extension roller; 21. Slide seat; 22. Pin. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] Please refer to Figures 1-4 A dyeing apparatus for a polarizing PVA film includes a dye box 1, with support plates 2 fixed on both sides of one top end of the dye box 1, and a guide roller 3 rotatably connected between the two support plates 2. Guide plates 4 are fixed on both sides of the top end of the dye box 1, and L-shaped plates 6 are slidably connected to the inner side of the guide plates 4. A pressure roller 7 is rotatably connected between the two L-shaped plates 6. A drying box 17 is fixed on the other top end of the dye box 1, and a heating rod 18 is mounted on the top of the inner side of the drying box 17. Pressure mechanisms for applying pressure to the PVA film are provided on both sides of the dye box 1.

[0029] In use, the dye is poured into the inside of the dye box 1, and then one end of the PVA film is passed through the guide roller 3, the lower pressure roller 7, the auxiliary roller 12 and the pressure roller 14, and finally through the inside of the drying box 17. This activates the pressing mechanism to effectively apply pressure to the PVA film, effectively soaking the PVA film in the dye, so as to effectively and evenly dye the PVA film and greatly increase the quality of PVA film dyeing.

[0030] Support blocks 11 are fixed at the top of the dye box 1 and on both sides between the guide plate 4 and the drying box 17. An auxiliary roller 12 is rotatably connected to the bottom of the two support blocks 11. A guide groove 15 is opened at the top inside the support block 11. A pressure roller 14 is slidably connected to the inner side of the guide groove 15. Springs 13 are fixed at the bottom of both sides of the pressure roller 14. The bottom of the springs 13 is fixed to the auxiliary roller 12.

[0031] The spring 13 drives the pressure roller 14 to apply pressure to the PVA film. The pressure roller 14 and the auxiliary roller 12 slightly squeeze the PVA film. At this time, the shrinkage elasticity of the pressure roller 14 is small, so as to effectively remove the dye on the surface of the PVA film and ensure the cleanliness of the PVA film surface.

[0032] The pressing mechanism includes a lead screw 5, a driven bevel gear 8, a main bevel gear 9, and a servo motor 10. Lead screws 5 are rotatably connected to both sides of the dye box 1. The outer side of the lead screw 5 is threaded to the L-shaped plate 6. The bottom ends of the two lead screws 5 are rotatably connected through a transmission belt. The driven bevel gear 8 is fixed to the bottom end of the outer side of one of the lead screws 5. The servo motor 10 is mounted on one side of the dye box 1. The main bevel gear 9 is fixed to the output end of the servo motor 10. The bottom end of the main bevel gear 9 is meshed with the driven bevel gear 8.

[0033] Specifically, by starting the servo motor 10, the main bevel gear 9 and the driven bevel gear 8 are driven to rotate. The driven bevel gear 8 drives one of the lead screws 5 to rotate. At this time, the transmission belt effectively rotates the two lead screws 5 synchronously. The lead screw 5 drives the L-shaped plate 6 and the lower pressure roller 7 to press down on the PVA film, thereby effectively pressing the PVA film into the inside of the dye box 1 for immersion, and effectively increasing the tension of the PVA film, so as to ensure the flatness and smoothness of the PVA film.

[0034] Guide rollers 19 are rotatably connected to both ends of the inner side of the drying box 17. An extension roller 20 is slidably connected to the bottom of the drying box 17. Slide seats 21 are rotatably connected to both sides of the extension roller 20. The inner side of the slide seats 21 is slidably connected to the drying box 17. Limiting grooves are opened at the top and bottom of both sides of the drying box 17. A pin 22 is slidably connected to one end of the slide seat 21. The pin 22 is slidably connected to the corresponding limiting groove. Two fans 16 are installed at the top of the drying box 17.

[0035] Furthermore, when one end of the PVA film passes through the inside of the drying chamber 17, the pin 22 is pulled to disengage from the corresponding limiting groove, and then the sliding slide 21 drives the extension roller 20 to be parallel with the guide roller 19. At this time, one end of the PVA film passes through one of the guide rollers 19 and through the extension roller 20, and finally exits through the other guide roller 19. Then, the sliding slide 21 is moved to drive the extension roller 20 downward, applying tension to the PVA film, so that the PVA film inside the drying chamber 17 forms a V-shape. Therefore, the heating rod 18 is started to heat the film, and the fan 16 is started to blow the heat generated by the heating rod 18 onto the PVA film. The V-shaped PVA film effectively increases the drying effect.

[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A dyeing apparatus for a polarizing PVA film, characterized in that, The device includes a dye box (1), with support plates (2) fixed on both sides of one end of the dye box (1), and guide rollers (3) rotatably connected between the two support plates (2). Guide plates (4) are fixed on both sides of the top of the dye box (1), and L-shaped plates (6) are slidably connected to the inner side of the guide plates (4). A pressure roller (7) is rotatably connected between the two L-shaped plates (6). A drying box (17) is fixed at the other end of the top of the dye box (1), and a heating rod (18) is installed at the top of the inner side of the drying box (17). A pressure mechanism for applying pressure to the PVA film is provided on both sides of the dye box (1).

2. The dyeing apparatus for a polarizing PVA film according to claim 1, characterized in that, The dye box (1) is fixed with support blocks (11) on both sides at the top and between the guide plate (4) and the drying box (17), and an auxiliary roller (12) is rotatably connected between the bottom ends of the two support blocks (11).

3. The dyeing apparatus for a polarizing PVA film according to claim 2, characterized in that, The top of the support block (11) is provided with a guide groove (15), and a pressure roller (14) is slidably connected to the inner side of the guide groove (15). Springs (13) are fixed at the bottom ends on both sides of the pressure roller (14), and the bottom ends of the springs (13) are fixed to the auxiliary roller (12).

4. The dyeing apparatus for a polarizing PVA film according to claim 2, characterized in that, The pressing mechanism includes a lead screw (5), a driven bevel gear (8), a main bevel gear (9), and a servo motor (10). Both sides of the dye box (1) are rotatably connected to lead screws (5). The outer side of the lead screw (5) is threadedly connected to an L-shaped plate (6). The bottom ends of the two lead screws (5) are rotatably connected by a transmission belt. The bottom end of the outer side of one of the lead screws (5) is fixed with a driven bevel gear (8). A servo motor (10) is mounted on one side of the dye box (1). The output end of the servo motor (10) is fixed with a main bevel gear (9). The bottom end of the main bevel gear (9) is meshed with the driven bevel gear (8).

5. The dyeing apparatus for a polarizing PVA film according to claim 4, characterized in that, The drying box (17) has guide rollers (19) rotatably connected to both ends of its inner side. An extension roller (20) is slidably connected to the bottom of the drying box (17). A slide block (21) is rotatably connected to both sides of the extension roller (20). The inner side of the slide block (21) is slidably connected to the drying box (17). Limiting grooves are opened at the top and bottom of both sides of the drying box (17). A pin (22) is slidably connected to one end of the slide block (21). The pin (22) is slidably connected to the corresponding limiting groove.

6. The dyeing apparatus for a polarizing PVA film according to claim 5, characterized in that, The top of the drying oven (17) is equipped with two fans (16).

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