TW201836719A - Overflow means, processing apparatus and method for manufacturing optical film - Google Patents

Abstract

An overflow means and processing apparatus are provided. The overflow means is used for controlling the flow direction of the processing liquid in the processing apparatus, and includes a case portion, a flow-guiding plate and a drainage pipe connecting the case portion. The flow-guiding plate is movably disposed on at least one side of the case portion so that the height of the flow-guiding plate can be adjusted according to the liquid level of the processing liquid to guide the processing liquid into the case portion.

Description

Overflow device, processing device and method for forming optical film

This disclosure relates to an overflow device and a processing device, and more particularly to an overflow device capable of adjusting the height with the liquid surface and a processing tank using the same.

Optical film materials usually need to undergo a variety of liquid processing wet processes, but during the process, it is easy to produce film debris or dust and other impurities floating in the treatment liquid, after reflow, there is a high probability of attaching to the optical film material, Cause defects.

The disclosure relates to an overflow device and a processing device. In the embodiment, the overflow device includes a drainage plate movably disposed on at least one side of the box body portion, and the height of the drainage plate is adjustable to control the flow direction of the processing liquid and guide it to the box body for filtration Remove impurities and reduce the chance of impurities sticking to the optical film.

According to an aspect of the present disclosure, an overflow device is proposed. The overflow device includes a box body, a drainage plate and a drain pipe. The drainage plate is movably disposed on at least one side of the box body, and the height of the drainage plate is adjustable. The drain pipe is connected to the box body.

According to another aspect of the present disclosure, a processing device is provided, which includes a processing tank and the overflow device. A processing liquid is contained in the processing tank, and an overflow device is disposed in the processing tank.

According to another aspect of the present disclosure, a method for forming an optical film is provided. The method includes the following steps. The step of conveying the optical film through the processing device is performed. Next, a step of drying the optical film material is performed.

In order to have a better understanding of the above and other aspects of this disclosure, the following specific examples are described in detail below in conjunction with the drawings:

The disclosure relates to an overflow device and a processing device. In the embodiment, the overflow device includes a drainage plate movably disposed on at least one side of the box body portion, and the position of the drainage plate can be adjusted with the liquid level of the processing liquid to control the flow direction of the processing liquid and guide it The impurities are filtered out in the box body to reduce the chance of the impurities sticking to the optical film.

It should be noted that this disclosure does not show all possible embodiments, and other implementations not proposed in this disclosure may also be applicable. Moreover, the dimensional proportions in the drawings are not drawn according to the actual products. Therefore, the contents of the description and the drawings are only used to describe the embodiments, and not used to limit the scope of the disclosure. In addition, the descriptions in the embodiments, such as the detailed structure, process steps, and application of materials, are for illustration purposes only, and are not intended to limit the scope of the disclosure to be protected. The details of the steps and structures of the embodiments can be changed and modified according to the needs of the actual application process without departing from the spirit and scope of the present disclosure. The following uses the same / similar symbols to indicate the same / similar components for explanation.

Please refer to FIG. 1, which illustrates a schematic diagram of a manufacturing process of the optical film 100 in some embodiments according to the present disclosure. For example, the manufacturing process of the optical film 100 may include the following steps: swelling treatment, dyeing treatment, stretching treatment, crosslinking treatment, washing treatment, and drying treatment. The optical film 100 can be sequentially passed through the guidance of a plurality of rollers 160: a swelling tank 110 for performing a swelling treatment, a dyeing tank 120 for performing a dyeing treatment, and a crosslinking tank 130 for performing a crosslinking treatment. Next, the optical film material 100 is conveyed through the water washing tank 140 to wash the reaction solution attached to the surface. After that, it is dried in the drying furnace 150 to obtain the optical film 100. However, when the optical film 100 passes through processing tanks such as the swelling tank 110, the dyeing tank 120, the cross-linking tank 130, and the water washing tank 140, impurities such as film debris or dust in the surface or the process environment are easily brought into these In the processing tank, such impurities may adhere to the surface of the optical film material 100 and affect the optical properties and output quality of the optical film material 100.

In one embodiment, impurities on the surface of the optical film 100 include optical film scraps, such as polyvinyl alcohol scraps, chemical crystals in a process bath, rust scraps, or impurities generated in other process materials or equipment.

In one embodiment, the optical film 100 may be a single-layer or multi-layer film, for example, it may be a polarizer, a retardation film, a brightness enhancement film, or other optical gain, alignment, compensation, steering, Orthogonal, diffuse, protective, anti-stick, scratch-resistant, anti-glare, reflection suppression, high refractive index and other helpful films.

In one embodiment, the optical film 100 can be a polyvinyl alcohol (PVA) resin film, which can be made by saponifying a polyvinyl acetate resin. Examples of the polyvinyl acetate resin include a single polymer of vinyl acetate, that is, polyvinyl acetate, and a copolymer of vinyl acetate and other monomers capable of copolymerizing with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids (e.g. acrylic acid, methacrylic acid, ethyl acrylate, propyl n-acrylate, methyl methacrylate), olefins (e.g. ethylene, propylene, 1 -Butene, 2-methylpropene), vinyl ethers (e.g. ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acids (e.g. vinyl sulfonic acid, vinyl Sodium sulfonate) and the like. The process bath 3 is a bath for dyeing and cross-linking process, surface treatment process or water washing process.

Please refer to FIG. 2A, which illustrates a schematic diagram of the circulation of the processing liquid 2 in the processing tank 1 of the processing apparatus according to an embodiment of the disclosure. The treatment tank 1 may be one of the swelling tank 110, the dyeing tank 120, the crosslinking tank 130, and the water washing tank 140 described above, but the disclosure is not limited thereto. The treatment tank 1 stores a treatment liquid 2 and may include at least one overflow device 3. For the convenience of description, in the embodiment, the area where the optical film (not shown) is immersed in the processing liquid 2 is defined as a liquid-receiving area P1, and the area where the optical film is transferred in the processing liquid 2 is defined as a transfer area P2 The area where the optical film material is pulled out from the processing liquid 2 is defined as a liquid discharge area P3. With the arrangement of at least one overflow device 3, the flow direction of the processing liquid 2 can be controlled, and impurities in the processing liquid 2 can be filtered out through the overflow device 3 to prevent these impurities from flowing back into the liquid inlet area P1, the transfer area P2 or The liquid discharge region P3 adheres to the optical film material. Specifically, the overflow device 3 may include a drainage plate 31 and a drain pipe 30, and the position of the drainage plate 31 may be adjusted according to the liquid level of the treatment liquid 2 to guide the treatment liquid 2 containing impurities from the drainage plate 31 Inside, and is discharged to the circulation pipe 101 outside the treatment tank 1 through the drain pipe 30. Here, the circulation pipeline 101 may be provided with a purification device 10 to filter out impurities in the treatment liquid 2. Then, the filtered and purified treatment liquid 2 can be recycled to the treatment tank 1 for reuse.

Please refer to FIG. 2B, which shows a top view of the processing tank 1 of FIG. 2A. The processing tank 1 may include a first wall 11, a second wall 12, a third wall 13, and a fourth wall 14. The first wall 11 is opposed to the third wall 13, and the second wall 12 is opposed to the fourth wall 14. . In another embodiment, the processing tank 1 may have other shapes, such as a polygon or a circle, and is not limited to the drawings in this embodiment.

In the embodiment, the overflow device 3 may be disposed at different positions in the processing tank 1, and the number is not limited. For example, referring to FIG. 2B, the overflow device 3 may be disposed on at least one of the first wall 11, the second wall 12, the third wall 13, and the fourth wall 14 via a support base (not shown). Overflow devices 3 can also be provided on each wall. Furthermore, more than one overflow device 3 may be provided on each wall. Here, the drainage plate 31 may be disposed on a side facing the liquid inlet region P1, the transfer region P2, and the liquid outlet region P3, so as to float impurities on the liquid inlet region P1, the transfer region P2, or the liquid outlet region P3. It is carried out through the drainage plate 31 and the drainage pipe 30 to prevent impurities from flowing back to the liquid-in area P1, the transfer area P2, or the liquid-out area P3. In one embodiment, when the overflow device 3 is disposed on the first wall 11 or the third wall 13, the traveling direction of the optical film material is substantially perpendicular to the length extension direction of the overflow device 3. When the overflow device 3 is disposed on the second wall In the wall 12 or the fourth wall 14, the traveling direction of the optical film material is substantially parallel to the length extension direction of the overflow device 3.

In another embodiment, as shown in FIGS. 3A and 3B, the overflow device 3 may be disposed across the second wall 12 and the fourth wall 14. Specifically, the overflow device 3 is disposed above the transfer area P2, and the drainage plates 31 are respectively disposed on two opposite sides facing the liquid inlet area P1 and the liquid outlet area P3 to float on the liquid inlet area P1 and the transfer area. P2 or impurities above the liquid discharge area P3 are carried out through the drainage plate 31 and the drain pipe 30. In addition, in one embodiment, one or more overflow devices 3 may be disposed on at least one of the first wall 11, the second wall 12, the third wall 13, and the fourth wall 14 at the same time. In FIGS. 3A and 3B, the traveling direction of the optical film is substantially perpendicular to the length extension direction of the overflow device 3, and passes through the processing liquid below the overflow device 3, as shown in FIG. 3A. Here, the length extension direction of the overflow device 3 is, for example, a direction parallel to the first wall 11 and the third wall 13 in FIG. 3B.

Please refer to FIG. 4, which illustrates a partial exploded view of the processing tank 1 according to an embodiment of the present disclosure. The overflow device 3 further includes a box body portion 32. The box body portion 32 is, for example, a box-shaped object having five sides, and the drain pipe 30 is connected to the box body portion 32, for example, is connected to the bottom surface of the box body portion 32. In one embodiment, the box body portion 32 conforms to 2 ≦ (ab) / A ≦ 200 and c / a ≦ 0.5, where a is the length of the box body portion 32, b is the width of the box body portion 32, and c is the box body portion The height of 32, A is the cross-sectional area of the drain pipe 30. Among them, a is not greater than 750 cm; b is not greater than 20 cm; c is not greater than 150 cm; and A is not greater than 300 cm ² .

The related configuration of the drainage plate 31 is described in detail below. In the embodiment, the drainage plate 31 is movably disposed on at least one side of the box body portion 32. Thus, the position of the drainage plate 31 can be adjusted according to the liquid level of the processing liquid 2. In the embodiment of FIG. 4, the box body portion 32 may have a bottom surface and four side surfaces, wherein the bottom surface is connected to the drain pipe 30, and the drainage plate 31 is disposed on the lower side of the four side surfaces.

In detail, please refer to FIGS. 4 to 5. FIG. 5 illustrates a perspective view of the processing tank 1 according to an embodiment of the present disclosure. The drainage plate 31 may have an opening 310. Therefore, a fixing member 320 may be inserted through the opening 310 to lock the drainage plate 31 on at least one side of the box body portion 32. Here, the drainage plate 31 is fixed to the lower one of the four side surfaces of the box body portion 32. In an embodiment, the opening 310 is, for example, a long hole, and the long axis of the opening 310 is perpendicular to the liquid surface. Thereby, the height of the drainage plate 31 can be freely adjusted according to the liquid surface height of the processing liquid 2 so that the processing liquid 2 can smoothly flow into the inner space 3e surrounded by the drainage plate 31 and the box body portion 32.

As shown in FIG. 4, the drainage plate 31 may have an undulating structure 31A, and the undulating structure 31A has a highest point 31At and a lowest point 31Ab. When the user adjusts the position of the drainage plate 31, the liquid level of the processing liquid 2 can be between the highest point 31At and the lowest point 31Ab of the undulating structure 31A. In this way, the processing liquid 2 can be guided into the internal space 3e, as shown in FIG. 5.

Please refer to FIG. 6A, which shows the shape of the undulating structure 31A. The shape of the undulating structure 31A is a continuous combination of triangles. The distance between the highest point of the undulating structure 31A adjacent to the band is L, and the distance between the highest point 31At and the lowest point 31Ab of the undulating structure 31A is H. The undulating structure 31A conforms to 0.005 ≦ L / a ≦ 1 and 0.03 ≦ H / c ≦ 1. Preferably, the undulating structure 31A conforms to 0.01 ≦ L / a ≦ 0.1 and 0.03 ≦ H / c ≦ 0.33, where a is the length of the box body portion 32 and c is the height of the box body portion 32.

Although the shape of the undulating structure 31A shown in FIG. 6A is a continuous combination of triangles, the disclosure is not limited thereto. Please refer to FIG. 6B to FIG. 6K, which respectively show the undulating structures 31B, 31C, 31D, 31E, 31F, 31G, 31H, 31I, 31J, and 31K of different shapes of the embodiments of the disclosure. As shown in FIG. 6B, the shape of the undulating structure 31B may be a discontinuous combination of triangles. As shown in FIGS. 6C, 6D, 6E, and 6F, the undulating structures 31C, 31D, 31E, and 31F may include arcs of different radians and combinations thereof. As shown in Figs. 6G and 6H, the undulating structures 31G and 31H may be continuous and discontinuous combinations of quadrilaterals, for example, the quadrilaterals are trapezoidal. As shown in Figures 6I, 6J, and 6K, the undulating structures 31I, 31J, and 31K can be continuous or discontinuous combinations of polygons. For example, the undulating structures 31I and 31J can be continuous and discontinuous combinations of pentagons. 31K can be a continuous combination of hexagons. Furthermore, the shape of the undulating structure is not limited to this, and the shape of the undulating structure can also be various combinations of the above figures.

In addition, please refer to FIG. 5. In another embodiment, the overflow device 3 may further include a filter element 4. The filter element 4 is detachably disposed in the box body portion 32, for example, in the internal space 3 e. . The filter 4 is, for example, a filter. The filter element 4 has a mesh number (unit: mesh) of 20 to 500 per square inch. By this, larger impurities and impurities can be filtered out initially to further increase the efficiency of filtering out impurities, while avoiding large impurities and The impurities cause the drain pipe 30 to become blocked. Furthermore, the number of the drainage pipes 30 may be more than one, so the number of the drainage pipes 30 may be increased / decreased according to the actual use situation.

As shown in FIG. 5, since the drain pipe 30 can continuously discharge the processing liquid 2 in the internal space 3e, the liquid level of the processing liquid 2 in the internal space 3e is higher than that of the processing liquid 2 in the processing tank 1. The height is low, and the processing liquid 2 in the internal space 3e will not flow back into the processing tank 1 to prevent the optical film from adhering to the impurities of the processing liquid 2.

In addition, in one embodiment, the drain pipe 30 is detachably connected to the box body portion 32. Referring to FIG. 4, the box body portion 32 may have a through hole 32 h. The through hole 32 h is disposed on the bottom surface of the box body portion 32, but is not limited thereto. The drain pipe 30 may have an opening 30h, and the opening 30h corresponds to the size of the through hole 32h, for example, it is slightly smaller than the size of the through hole 32h according to the design of the tolerance. In this way, the drain pipe 30 can be embedded in the through hole 32h through the opening 30h and combined with the box body portion 32, but the present disclosure is not limited to this combination. In addition, a filter screen (not shown) may be provided inside the drain pipe 30 to further filter out impurities and prevent the drain pipe 30 from being blocked. The filter has a mesh number of 40 to 2500 per square inch (unit: mesh). In order to achieve a better filtering effect, the number of meshes per square inch of the filter is relative to the number of meshes of the filter 4 Many, for example, between 2 and 5 times the number of holes in the filter 4.

In an embodiment, as shown in FIG. 4, the drain pipe 30 may further include a handle 301. When cleaning is needed, the user can disassemble the box body portion 32 and the drain pipe 30, and can hold the handle 301 and pull the drain pipe 30 out of the processing tank 1 for cleaning, which is convenient for the user to operate and maintain. Overflow device.

The overflow device and the processing tank provided above can control the flow direction of the processing liquid in the processing tank to filter out impurities contained in the processing liquid. The overflow device can be arranged in different positions in the processing tank according to the use situation, and the number of the arrangement is not limited. The overflow device includes a drainage plate movably disposed on at least one side of the box body portion. Thereby, the position of the drainage plate can be adjusted according to the liquid level of the processing liquid, so as to control the flow direction of the processing liquid and guide it into the box body to filter out impurities and reduce the chance of the impurities sticking to the optical film.

In summary, although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

1‧‧‧ treatment tank

2‧‧‧ treatment liquid

3‧‧‧ Overflow device

3e‧‧‧Internal space

4‧‧‧Filter

10‧‧‧Purification device

11‧‧‧ first wall

12‧‧‧ the second wall

13‧‧‧ Third wall

14‧‧‧ fourth wall

30‧‧‧ Drain pipe

30h‧‧‧Open

31‧‧‧ Drain Board

31A, 31B, 31C, 31D, 31E, 31F, 31G, 31H, 31I, 31J, 31K

31Ab‧‧‧ Low

31At‧‧‧ Highest Point

32‧‧‧Box body

32h‧‧‧through hole

101‧‧‧Circulation pipeline

100‧‧‧ Optical Film

110‧‧‧Swelling trough

120‧‧‧ Dyeing tank

130‧‧‧ Crosslinking tank

140‧‧‧washing tank

150‧‧‧ drying furnace

160‧‧‧roller

301‧‧‧Handle

310‧‧‧ opening

320‧‧‧Fixed parts

a‧‧‧length

b‧‧‧ width

c‧‧‧ height

H‧‧‧ The distance between the highest point and the lowest point of the undulating structure

L‧‧‧ the distance between the highest points of adjacent wave bands

P1‧‧‧Into the liquid area

P2‧‧‧ transfer area

P3‧‧‧ discharge area

FIG. 1 is a schematic diagram of a process equipment for an optical film in some embodiments according to the present disclosure. FIG. 2A is a schematic diagram of a circulation of a processing liquid in a processing tank of a processing apparatus according to an embodiment of the disclosure. FIG. 2B is a top view of the processing tank of FIG. 2A. FIG. 3A is a schematic diagram of the circulation of the processing liquid in the processing tank of the processing apparatus according to another embodiment of the present disclosure. FIG. 3B is a top view of the processing tank of FIG. 3A. FIG. 4 is a partial exploded view of a processing tank according to an embodiment of the disclosure. FIG. 5 is a perspective view of a processing tank according to an embodiment of the disclosure. FIG. 6A to FIG. 6K respectively show the undulating structures with different shapes according to some embodiments of the present disclosure.

Claims (12)

An overflow device includes: a box body portion; a drainage plate movably disposed on at least one side of the box body portion, wherein the height of the drainage plate is adjustable; and a drainage pipe connected to the box body unit. The overflow device according to item 1 of the scope of patent application, wherein the drainage plate has an opening; the drainage plate is fixed on the at least one side of the box body portion by a fixing member passing through the opening. ; And / or the opening is an elongated hole. The overflow device according to item 1 of the patent application scope further includes a filter element; the filter element is detachably disposed in the box body portion; and / or the filter element has a number of holes of 20 to 500 per square inch . The overflow device according to item 1 of the scope of patent application, wherein the drain pipe is detachably connected to the box body portion; and / or the box body portion has a through hole, the drain pipe has an opening, and the opening is suitable for The drainage pipe is embedded in the through hole so that the drainage pipe is combined with the box body portion; and / or the drainage pipe further includes a handle; and / or a drainage screen is set in the drainage pipe, and the filtration screen has a per square inch of 40 The number of holes of ~ 2500. The overflow device according to item 1 of the patent application scope, wherein the drainage plate is movably disposed on two opposite sides of the box body portion; and / or the drainage plate has an undulating structure, wherein the shape of the undulating structure It is arc, triangle, trapezoid, polygon, or a combination of the above graphics. The overflow device according to item 5 of the scope of patent application, wherein the undulating structure conforms to 0.005 ≦ L / a ≦ 1 and 0.03 ≦ H / c ≦ 1, where L is between the highest point of the adjacent band of the undulating structure The distance H is the distance between the highest point and the lowest point of the undulating structure, a is the length of the box body portion, and c is the height of the box body portion. The overflow device according to item 1 of the scope of patent application, wherein the box body portion meets 2 ≦ (ab) / A ≦ 200 and c / a ≦ 0.5, where a is the length of the box body portion and b is the box portion The width of the body, c is the height of the box body, and A is the cross-sectional area of the drain pipe; and / or a is not greater than 750 cm, b is not greater than 20 cm, and c is not greater than 150 cm; A is not greater than 300 cm ² . A processing device includes: a processing tank, wherein a processing liquid is contained in the processing tank; and an overflow device according to items 1 to 7 of the scope of patent application, which is arranged in the processing tank. The processing device according to item 8 of the scope of patent application, wherein the processing tank further includes a first wall, a second wall, a third wall, and a fourth wall, and the first wall is opposite to the third wall, The second wall is opposite to the fourth wall; wherein the at least one overflow device is disposed on at least one of the first wall, the second wall, the third wall, and the fourth wall; and / or the The treatment tank is a swelling tank, a dyeing tank, a cross-linking tank, and / or a water washing tank. The processing device according to item 9 of the scope of patent application, wherein the overflow device is across the second wall and the fourth wall, and the length extension direction of the overflow device is the first wall and the third wall. The directions of the walls are parallel. A method for forming an optical film material includes: conveying an optical film material through a processing device as described in items 8 to 10 of the scope of patent application; and drying the optical film material. The method for forming an optical film material according to item 11 of the scope of application for patent, wherein the optical film material is a polyvinyl alcohol resin film; and / or the travel direction of the optical film material is the length extension direction of the overflow device Approximately vertical; and / or the optical film is passed through the treatment liquid below the overflow device.