Heating device for improving appearance of film surface of polarizing film material

Abstract

The utility model relates to a heating device for improving the film surface appearance of a polarizing film material. The heating device comprises a box body, an air inlet formed in the top of the side face of the box body, an air outlet formed in one side of the bottom of the side face of the box body and a circulating air inlet formed in the other side of the bottom of the side face of the box body. The gas inlet is used for introducing gas into the box body, the gas outlet is used for discharging gas out of the box body, the circulating gas inlet is used for introducing circulating gas into the box body, the gas outlet is partially connected with the circulating gas inlet through a pipeline, and a heating device is arranged on the pipeline. A plurality of roller lines are arranged in the box body, each roller line comprises a plurality of rollers, a film penetrating inlet corresponding to the roller lines is formed in one side of the box body, and a film penetrating outlet corresponding to the roller lines is formed in the other side of the box body. The film material heating device is high in internal temperature uniformity, the temperature difference of all sites in the device is small, and the flattening treatment effect on surface defects of the polarizing film material is good.

Description

Technical Field

[0001] The utility model relates to the field of polarizers, and in particular to a heating device for improving the appearance of the film surface of a polarizing film material. Background Art

[0002] With the development of the polarizer industry, the market's quality requirements for polarizers are getting higher and higher. The problem of film surface defects is a major issue affecting product quality. However, as the demand size in the panel market is increasing day by day, under the demand for extra-large-sized panels, the production width of polarizer rolls also increases accordingly, and the width of the polarizer raw material must also increase; in addition, the current market demand for polarizers is gradually tending towards thinner types, so the raw materials must also be thinned accordingly. Therefore, under the dual influence of the increase in the width and thinning of the polarizer raw material, it is a major challenge to the quality of the raw material, and the production of polarizers must also improve the quality of the raw material to ensure the quality of the polarizer is without problems. Therefore, designing a device for improving the appearance of the polarizer film surface is an urgent problem to be solved. Summary of the Utility Model

[0003] The purpose of this application is to provide a heating device that can improve the surface defects of the polarizing film material.

[0004] The heating device includes a box body, an air inlet arranged at the top of the side of the box body, an exhaust port arranged at one side of the bottom of the side of the box body, and a circulating air inlet arranged at the other side of the bottom of the side of the box body; the air inlet is used to introduce gas into the box body, the exhaust port is used to discharge gas out of the box body, the circulating air inlet is used to introduce circulating gas into the box body, the exhaust port and the circulating air inlet are partially connected through a pipeline, a heating device is arranged on the pipeline, and the circulating gas is the gas that is partially discharged gas and then introduced into the circulating air inlet after heat treatment.

[0005] A number of roller lines are arranged in the box body, the roller lines include a number of rollers, a film passing inlet corresponding to the roller lines is arranged on one side of the box body, and a film passing outlet corresponding to the roller lines is arranged on the other side of the box body.

[0006] More specifically, the air inlet is arranged at the middle position of the top of the side of the box body.

[0007] More specifically, the rollers on the roller lines are evenly distributed.

[0008] More specifically, the rollers on the roller lines are distributed on the same horizontal plane and are arranged in parallel.

[0009] More specifically, the rollers on the roller lines are arranged in a W shape, and the rollers are located at the vertex positions or the bottom positions of the W shape.

[0010] More specifically, filtering devices are provided on the air inlet, the circulating air inlet, and the exhaust port.

[0011] More specifically, air speed regulating valves are provided on the air inlet and the circulating air inlet.

[0012] More specifically, a baffle is provided inside the box body, and the baffle is located in front of the air inlet.

[0013] More specifically, an opening door is provided on the side of the box body, and the opening door is used for process operations.

[0014] More specifically, the axial length of the roller is at least 2.6 meters.

[0015] The beneficial effects of this application are as follows: By adjusting the temperature and residence time of the film heating device, the quality of the film can be improved, the quality of the polarizer product can be enhanced, and the requirements of high-end models in the panel market can be met. The internal temperature uniformity of the heating device is high, the temperature difference at each point inside the device is small, and the surface defect flattening treatment effect of the polarizing film is good. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the heating device for improving the film surface appearance of the polarizing film in this application;

[0017] Figure 2 is a schematic diagram of the film surface defects of the polarizing film in this application;

[0018] Figure 3 is a schematic diagram of the winding of the polarizing film in this application;

[0019] Figure 4 is a schematic diagram of the distribution of different test sites when the heating device in this application is working;

[0020] Figure 5 is a schematic diagram of the film lamination in this application.

[0021] In the figure: 101, opening door; 102, air inlet; 103, roller; 104, exhaust port; 105, circulating air inlet; 106, film passing outlet; 107, film passing inlet; 108, film defect; 109, upper protective film; 110, PVA film; 111, lower protective film. Detailed Embodiments

[0022] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] As Figure 3 shown, when the polarizing original film is wound up, it is easy to cause film defects such as wrinkles on the film surface. If the film defects 108 on the surface of the original film are used in subsequent processes such as lamination without treatment, the film defects 108 will be brought into the subsequent production process and finally exist on the polarizing film product, resulting in quality problems of the polarizing film. The film material of the original film includes triacetyl cellulose film, cyclopentene film, acrylic film, polyvinyl alcohol, polyethylene terephthalate film, etc. The film materials of these materials will face the problem of film defects on the film surface during the production process. Therefore, this application designs a film material heating device. When in use, specifically as Figure 5 shown, before the film material lamination process, both the upper film material and the lower film material of PVA are pre-treated by the film layer heating device designed in this application, and after the surface defects of the film material are leveled, the lamination process is carried out, which can ensure that the defects on the film layer surface are greatly reduced. The film material heating device designed in this application can also be used in combination with various film material pre-treatment devices, such as a corona device, a water washing device, etc.

[0026] As Figure 1As shown in the figure, the heating device designed in this application includes: a box body, and an air inlet 102 provided at the top of the side of the box body. The air inlet 102 is used to introduce heat treatment gas into the box body. The heat treatment gas can be pre-heated hot air. To ensure the film surface treatment effect, the temperature of the introduced hot air should not be lower than 80°C. It also includes an exhaust port 105 provided at one side of the bottom of the side of the box body. The exhaust port 105 is used to discharge the cold gas in the box body. After the hot air heats the film material, the temperature of the hot air decreases, so the exhaust port 105 is provided to discharge the cold gas in time. It also includes a circulating air inlet 104 provided at the other side of the bottom of the side of the box body. The circulating air inlet 104 is used to introduce circulating gas into the box body. Since the air inlet 102 is provided in the top area of the side of the box body, in order to ensure that the bottom area of the box body also has sufficient heat to heat the surface of the film material, a circulating air inlet 104 is provided in the bottom area of the side. Among them, the exhaust port 105 and the circulating air inlet 104 are connected by a part of the pipeline, and a heating device is provided on the pipeline to reheat the discharged gas. The reheated gas returns to the device to heat the bottom space of the device, which can ensure that the temperature in the device is more uniform. The circulating air inlet 104 and the exhaust port 105 are respectively located on both sides of the bottom of the box body. At the same time, in order to further improve the internal heat uniformity in the heating device, the air inlet 102 is provided in the middle position of the top of the side of the box body. After the hot air enters, it can be evenly distributed in the box body to ensure the leveling treatment effect of the surface defects of the film material. When the equipment is working, in order to ensure a better treatment effect, this application has optimized the design of the air intake volume and the air outlet volume. Among them, the air intake volume of the air inlet 102 is 70-100%, the circulating air volume of the circulating air inlet 104 is 50-80%, and the air outlet volume of the air outlet 105 is 10-40%.

[0027] Several roller lines are arranged in the box body, as Figure 1 shown. The roller line can include two upper and lower ones. There are several rollers 103 on the roller line. The number of rollers 103 on one roller line can be 3, 4, 5 or other numbers. The number of rollers 103 can be adjusted according to the actual site or the film material treatment requirements. The film threading inlet 107 of the roller line is provided on one side of the box body, and the film threading outlet 106 is provided on the other side of the box body. The rollers on the roller line are evenly distributed. Among them, the rollers on the roller line can be arranged in parallel on the horizontal plane, or can be arranged in a W shape. The rollers are located at the vertex position or the bottom position of the W shape. Preferably, the roller material in the film material heating device is SUS304 or SUS316, and the number of rollers is not limited and can be adjusted according to actual needs. The film material passes through the rollers in turn. The time for the film material to pass through the box body of the heating device can be set to 5s, 10s, 20s or more. Among them, the path of the film material is not limited, and it can be up and down interspersed or left and right interspersed.

[0028] The film heating device designed in this application heats the film material to a temperature of 80 - 120°C. The temperature inside the device is uniform, the temperature difference between the upper and lower parts is between 0 - 20°C, and the temperature fluctuation at the film passing opening and inside is within the range of 0 - 30°C.

[0029] In some specific embodiments, filtering devices are provided on the air inlet, circulating air inlet, and exhaust outlet of the film heating device. The filtering devices can help filter out impurities such as dust. At the same time, air speed regulating valves can also be provided on the air inlet and circulating air inlet to help adjust the air intake volume and air intake speed when necessary.

[0030] In some specific embodiments, a baffle is also provided inside the box body. The baffle is located in front of the air inlet and can partially block the incoming air, avoiding the hot air at the air inlet 102 from directly blowing at a high speed on the surface of the film material. Through the baffle, the hot air inside the box body can be made more uniform, avoiding local overheating and damaging the film material.

[0031] In some specific embodiments, an opening door 101 is provided on the side of the box body. The opening door 101 can be used for operators to enter when manually threading the film material and can also be used in process operations such as equipment maintenance.

[0032] The film heating device designed in this application is applicable to ultra-wide film materials. The width of the film material can be 2260 mm or more, and the axial length of the rollers is at least 2.6 meters. Even for wide-width polarizing film materials, it has an excellent homogenizing heat treatment effect and can greatly improve the problem of film defects on the surface of the film material.

[0033] Example 1

[0034] A TAC film material with a width of 2260 mm is used. The temperature inside the heating device is set to 100°C, and the residence time of the film material in the device is 10S. The air volume at the air inlet 102 of the heating device is set to 90%, the circulating air volume at the circulating air inlet 104 is 75%, and the air volume at the air outlet 105 is 30%. Under these conditions, the temperature at each point of the heating device is measured (the measurement points are as Figure 4 shown), and the test results are shown in the following table:

[0035]

[0036] In Example 1, the maximum value of △ temperature is 1.66°C, and the temperature uniformity at each point is very good. The improvement effect on the flatness of the film surface defects is significant. Calculate the flat defect value on the surface of the film material (flat defect = number of defects / square meter). The flat defect value in Example 1 is calculated to be about 0.07.

[0037] Comparative Example 1

[0038] Use a TAC film material with a width of 2260 mm. Set the temperature in the heating device to 100 °C, and the residence time of the film material in the device is 10 s. Set the air volume of the air inlet 102 of the heating device to 65%, the circulating air volume of the circulating air inlet 104 to 40%, and the air volume of the air outlet 105 to 50%. Measure the temperature at each point of the heating device under this condition (the measurement points are as shown in Figure 4 ), and the test results are shown in the following table:

[0039]

[0040] In Comparative Example 1, the maximum value of △ temperature is 11.92 °C. Since the air intake of the air inlet 102 and the circulating air inlet 104 is too small, and the air outlet of the air outlet 105 is too large, the temperature uniformity at each point in the heating device is relatively poor. The calculated flatness value is about 0.35. Comparative Example 1 has a poor effect on improving the flatness of the surface defects of the film material. Through the device structure designed in this application and the design of the air volume at the inlet and outlet, the temperature difference at each point in the device can be controlled within 2 °C, and the temperature uniformity in the device is good.

[0041] The above has described the embodiments of the present invention in detail, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. A heating device for improving the film surface appearance of a polarizing film material, characterized in that, It includes a box body, an air inlet arranged at the top of the side of the box body, an exhaust outlet arranged at one side of the bottom of the side of the box body, and a circulating air inlet arranged at the other side of the bottom of the side of the box body; the air inlet is used to introduce gas into the box body, the exhaust outlet is used to discharge gas outside the box body, the circulating air inlet is used to introduce circulating gas into the box body, the exhaust outlet and the circulating air inlet are partially connected by a pipeline, and a heating device is arranged on the pipeline; A number of roller lines are arranged in the box body, each roller line includes a number of rollers, a film threading inlet corresponding to the roller line is arranged on one side of the box body, and a film threading outlet corresponding to the roller line is arranged on the other side of the box body.

2. The heating device according to claim 1, wherein The air inlet is arranged at the middle position of the top of the side of the box body.

3. The heating device according to claim 1, characterized in that, The rollers on the roller line are evenly distributed.

4. The heating device according to claim 1, characterized in that, The rollers on the roller line are distributed on the same horizontal plane and are arranged in parallel.

5. The heating device according to claim 1, characterized in that, The rollers on the roller line are arranged in a W shape.

6. The heating device according to claim 1, characterized in that, Filter devices are arranged on the air inlet, the circulating air inlet and the exhaust outlet.

7. The heating device according to claim 1, characterized in that, Air speed regulating valves are arranged on the air inlet and the circulating air inlet.

8. The heating device according to claim 1, characterized in that A baffle is arranged in the box body, and the baffle is located in front of the air inlet.

9. The heating device according to claim 1, characterized in that, An opening door is arranged on the side of the box body, and the opening door is used for process operations.

10. The heating device according to claim 1, characterized in that, The axial length of the roller is at least 2.6 meters.

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